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Commit | Line | Data |
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56e12059 | 1 | // tapset resolution |
aa30ccd3 FCE |
2 | // Copyright (C) 2005-2007 Red Hat Inc. |
3 | // Copyright (C) 2005-2007 Intel Corporation. | |
56e12059 FCE |
4 | // |
5 | // This file is part of systemtap, and is free software. You can | |
6 | // redistribute it and/or modify it under the terms of the GNU General | |
7 | // Public License (GPL); either version 2, or (at your option) any | |
8 | // later version. | |
9 | ||
10 | #include "config.h" | |
11 | #include "staptree.h" | |
12 | #include "elaborate.h" | |
b55bc428 | 13 | #include "tapsets.h" |
56e12059 | 14 | #include "translate.h" |
dc38c0ae | 15 | #include "session.h" |
72dbc915 | 16 | #include "util.h" |
bd2b1e68 GH |
17 | |
18 | #include <deque> | |
56e12059 | 19 | #include <iostream> |
bd2b1e68 | 20 | #include <map> |
ec4373ff | 21 | #include <set> |
56e12059 | 22 | #include <sstream> |
bd2b1e68 | 23 | #include <stdexcept> |
b55bc428 | 24 | #include <vector> |
e36387d7 | 25 | #include <cstdarg> |
29e64872 | 26 | #include <cassert> |
bd2b1e68 GH |
27 | |
28 | extern "C" { | |
df8fadee | 29 | #include <fcntl.h> |
bd2b1e68 | 30 | #include <elfutils/libdwfl.h> |
7a053d3b | 31 | #include <elfutils/libdw.h> |
c931ec8a | 32 | #include <elfutils/libebl.h> |
77de5e9e GH |
33 | #include <dwarf.h> |
34 | #include <elf.h> | |
35 | #include <obstack.h> | |
30a279be | 36 | #include <regex.h> |
b20febf3 | 37 | #include <glob.h> |
30a279be | 38 | #include <fnmatch.h> |
4b1ad75e | 39 | |
30a279be | 40 | #include "loc2c.h" |
4b1ad75e RM |
41 | #define __STDC_FORMAT_MACROS |
42 | #include <inttypes.h> | |
bd2b1e68 | 43 | } |
77de5e9e | 44 | |
56e12059 | 45 | |
47dd066d WC |
46 | #ifdef PERFMON |
47 | #include <perfmon/pfmlib.h> | |
48 | #include <perfmon/perfmon.h> | |
49 | #endif | |
50 | ||
56e12059 FCE |
51 | using namespace std; |
52 | ||
cc9ee605 | 53 | |
b20febf3 FCE |
54 | // ------------------------------------------------------------------------ |
55 | // Generic derived_probe_group: contains an ordinary vector of the | |
56 | // given type. It provides only the enrollment function. | |
57 | ||
58 | template <class DP> struct generic_dpg: public derived_probe_group | |
59 | { | |
60 | protected: | |
61 | vector <DP*> probes; | |
62 | public: | |
63 | generic_dpg () {} | |
64 | void enroll (DP* probe) { probes.push_back (probe); } | |
65 | }; | |
46b84a80 DS |
66 | |
67 | ||
b20febf3 FCE |
68 | |
69 | // ------------------------------------------------------------------------ | |
70 | // begin/end probes are run right during registration / deregistration | |
9a604fac FCE |
71 | // ------------------------------------------------------------------------ |
72 | ||
b20febf3 FCE |
73 | struct be_derived_probe: public derived_probe |
74 | { | |
75 | bool begin; | |
16e8f21f JS |
76 | int64_t priority; |
77 | ||
78 | be_derived_probe (probe* p, bool b, int64_t pr): | |
79 | derived_probe (p), begin (b), priority (pr) {} | |
80 | be_derived_probe (probe* p, probe_point* l, bool b, int64_t pr): | |
81 | derived_probe (p, l), begin (b), priority (pr) {} | |
b20febf3 FCE |
82 | |
83 | void join_group (systemtap_session& s); | |
16e8f21f JS |
84 | |
85 | static inline bool comp(be_derived_probe const *a, | |
86 | be_derived_probe const *b) | |
87 | { return a->priority < b->priority; } | |
b20febf3 FCE |
88 | }; |
89 | ||
90 | ||
91 | struct be_derived_probe_group: public generic_dpg<be_derived_probe> | |
92 | { | |
93 | public: | |
94 | void emit_module_decls (systemtap_session& s); | |
95 | void emit_module_init (systemtap_session& s); | |
96 | void emit_module_exit (systemtap_session& s); | |
97 | }; | |
98 | ||
99 | ||
100 | struct be_builder: public derived_probe_builder | |
101 | { | |
102 | bool begin; | |
103 | be_builder(bool b) : begin(b) {} | |
78f6bba6 | 104 | virtual void build(systemtap_session &, |
b20febf3 FCE |
105 | probe * base, |
106 | probe_point * location, | |
107 | std::map<std::string, literal *> const & parameters, | |
108 | vector<derived_probe *> & finished_results) | |
109 | { | |
16e8f21f JS |
110 | int64_t priority; |
111 | if ((begin && !get_param(parameters, "begin", priority)) | |
112 | || (!begin && !get_param(parameters, "end", priority))) | |
113 | priority = 0; | |
114 | finished_results.push_back( | |
115 | new be_derived_probe(base, location, begin, priority)); | |
b20febf3 FCE |
116 | } |
117 | }; | |
118 | ||
119 | ||
9a604fac | 120 | void |
b20febf3 | 121 | be_derived_probe::join_group (systemtap_session& s) |
9a604fac | 122 | { |
b20febf3 FCE |
123 | if (! s.be_derived_probes) |
124 | s.be_derived_probes = new be_derived_probe_group (); | |
125 | s.be_derived_probes->enroll (this); | |
126 | } | |
47dd066d | 127 | |
b20febf3 FCE |
128 | |
129 | // ------------------------------------------------------------------------ | |
130 | void | |
131 | common_probe_entryfn_prologue (translator_output* o, string statestr) | |
132 | { | |
72d18b98 | 133 | o->newline() << "struct context* __restrict__ c;"; |
b20febf3 FCE |
134 | o->newline() << "unsigned long flags;"; |
135 | ||
b20febf3 | 136 | o->newline() << "#ifdef STP_TIMING"; |
dbb68664 FCE |
137 | // NB: we truncate cycles counts to 32 bits. Perhaps it should be |
138 | // fewer, if the hardware counter rolls over really quickly. See | |
139 | // also ...epilogue(). | |
140 | o->newline() << "int32_t cycles_atstart = (int32_t) get_cycles ();"; | |
b20febf3 | 141 | o->newline() << "#endif"; |
b20febf3 FCE |
142 | |
143 | #if 0 /* XXX: PERFMON */ | |
47dd066d WC |
144 | o->newline() << "static struct pfarg_ctx _pfm_context;"; |
145 | o->newline() << "static void *_pfm_desc;"; | |
146 | o->newline() << "static struct pfarg_pmc *_pfm_pmc_x;"; | |
147 | o->newline() << "static int _pfm_num_pmc_x;"; | |
148 | o->newline() << "static struct pfarg_pmd *_pfm_pmd_x;"; | |
149 | o->newline() << "static int _pfm_num_pmd_x;"; | |
150 | #endif | |
151 | ||
b20febf3 FCE |
152 | o->newline() << "local_irq_save (flags);"; |
153 | ||
c931ec8a | 154 | // Check for enough free enough stack space |
d05a1d00 | 155 | o->newline() << "if (unlikely ((((unsigned long) (& c)) & (THREAD_SIZE-1))"; // free space |
a63401b1 | 156 | o->newline(1) << "< (MINSTACKSPACE + sizeof (struct thread_info)))) {"; // needed space |
d05a1d00 FCE |
157 | // XXX: may need porting to platforms where task_struct is not at bottom of kernel stack |
158 | // NB: see also CONFIG_DEBUG_STACKOVERFLOW | |
159 | o->newline() << "if (unlikely (atomic_inc_return (& skipped_count) > MAXSKIPPED)) {"; | |
c931ec8a FCE |
160 | o->newline(1) << "atomic_set (& session_state, STAP_SESSION_ERROR);"; |
161 | o->newline() << "_stp_exit ();"; | |
162 | o->newline(-1) << "}"; | |
163 | o->newline() << "goto probe_epilogue;"; | |
164 | o->newline(-1) << "}"; | |
165 | ||
b20febf3 FCE |
166 | o->newline() << "if (atomic_read (&session_state) != " << statestr << ")"; |
167 | o->newline(1) << "goto probe_epilogue;"; | |
168 | o->indent(-1); | |
9a604fac | 169 | |
a44a0785 | 170 | o->newline() << "c = per_cpu_ptr (contexts, smp_processor_id());"; |
b20febf3 | 171 | o->newline() << "if (unlikely (atomic_inc_return (&c->busy) != 1)) {"; |
9a604fac FCE |
172 | o->newline(1) << "if (atomic_inc_return (& skipped_count) > MAXSKIPPED) {"; |
173 | o->newline(1) << "atomic_set (& session_state, STAP_SESSION_ERROR);"; | |
174 | // NB: We don't assume that we can safely call stp_error etc. in such | |
175 | // a reentrant context. But this is OK: | |
176 | o->newline() << "_stp_exit ();"; | |
177 | o->newline(-1) << "}"; | |
9a604fac | 178 | o->newline() << "atomic_dec (& c->busy);"; |
b20febf3 | 179 | o->newline() << "goto probe_epilogue;"; |
9a604fac FCE |
180 | o->newline(-1) << "}"; |
181 | o->newline(); | |
182 | o->newline() << "c->last_error = 0;"; | |
9a604fac FCE |
183 | o->newline() << "c->nesting = 0;"; |
184 | o->newline() << "c->regs = 0;"; | |
fcff848e | 185 | o->newline() << "c->pi = 0;"; |
b20febf3 | 186 | o->newline() << "c->probe_point = 0;"; |
9a604fac | 187 | o->newline() << "c->actioncount = 0;"; |
dbb68664 FCE |
188 | o->newline() << "#ifdef STP_TIMING"; |
189 | o->newline() << "c->statp = 0;"; | |
190 | o->newline() << "#endif"; | |
b20febf3 | 191 | } |
9a604fac | 192 | |
a44a0785 | 193 | |
b20febf3 FCE |
194 | void |
195 | common_probe_entryfn_epilogue (translator_output* o) | |
196 | { | |
dbb68664 FCE |
197 | o->newline() << "#ifdef STP_TIMING"; |
198 | o->newline() << "{"; | |
199 | o->newline(1) << "int32_t cycles_atend = (int32_t) get_cycles ();"; | |
200 | // Handle 32-bit wraparound. | |
201 | o->newline() << "int32_t cycles_elapsed = (cycles_atend > cycles_atstart)"; | |
202 | o->newline(1) << "? (cycles_atend - cycles_atstart)"; | |
203 | o->newline() << ": (~(int32_t)0) - cycles_atstart + cycles_atend + 1;"; | |
204 | ||
205 | o->newline() << "if (likely (c->statp)) _stp_stat_add(*c->statp, cycles_elapsed);"; | |
206 | o->indent(-1); | |
207 | o->newline(-1) << "}"; | |
208 | o->newline() << "#endif"; | |
209 | ||
9a604fac FCE |
210 | o->newline() << "if (unlikely (c->last_error && c->last_error[0])) {"; |
211 | o->newline(1) << "if (c->last_stmt != NULL)"; | |
212 | o->newline(1) << "_stp_softerror (\"%s near %s\", c->last_error, c->last_stmt);"; | |
213 | o->newline(-1) << "else"; | |
214 | o->newline(1) << "_stp_softerror (\"%s\", c->last_error);"; | |
215 | o->indent(-1); | |
216 | o->newline() << "atomic_inc (& error_count);"; | |
9a604fac FCE |
217 | o->newline() << "if (atomic_read (& error_count) > MAXERRORS) {"; |
218 | o->newline(1) << "atomic_set (& session_state, STAP_SESSION_ERROR);"; | |
219 | o->newline() << "_stp_exit ();"; | |
220 | o->newline(-1) << "}"; | |
9a604fac | 221 | o->newline(-1) << "}"; |
9a604fac | 222 | o->newline() << "atomic_dec (&c->busy);"; |
a44a0785 | 223 | |
b20febf3 FCE |
224 | o->newline(-1) << "probe_epilogue:"; // context is free |
225 | o->indent(1); | |
a44a0785 | 226 | |
4b17d6af | 227 | o->newline() << "local_irq_restore (flags);"; |
9a604fac FCE |
228 | } |
229 | ||
230 | ||
56e12059 FCE |
231 | // ------------------------------------------------------------------------ |
232 | ||
56e12059 | 233 | void |
b20febf3 FCE |
234 | be_derived_probe_group::emit_module_decls (systemtap_session& s) |
235 | { | |
236 | if (probes.empty()) return; | |
237 | ||
238 | s.op->newline() << "/* ---- begin/end probes ---- */"; | |
239 | s.op->newline() << "void enter_begin_probe (void (*fn)(struct context*)) {"; | |
240 | s.op->indent(1); | |
241 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_STARTING"); | |
242 | s.op->newline() << "c->probe_point = \"begin\";"; | |
243 | s.op->newline() << "(*fn) (c);"; | |
244 | common_probe_entryfn_epilogue (s.op); | |
245 | s.op->newline(-1) << "}"; | |
246 | s.op->newline() << "void enter_end_probe (void (*fn)(struct context*)) {"; | |
247 | s.op->indent(1); | |
248 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_STOPPING"); | |
249 | s.op->newline() << "c->probe_point = \"end\";"; | |
250 | s.op->newline() << "(*fn) (c);"; | |
251 | common_probe_entryfn_epilogue (s.op); | |
252 | s.op->newline(-1) << "}"; | |
56e12059 FCE |
253 | } |
254 | ||
dc38c0ae | 255 | void |
b20febf3 | 256 | be_derived_probe_group::emit_module_init (systemtap_session& s) |
dc38c0ae | 257 | { |
b20febf3 | 258 | // if (probes.empty()) return; |
e0d86324 | 259 | bool have_begin_probes = false; |
16e8f21f | 260 | sort(probes.begin(), probes.end(), be_derived_probe::comp); |
b20febf3 FCE |
261 | for (unsigned i=0; i < probes.size (); i++) |
262 | if (probes[i]->begin) | |
e0d86324 JS |
263 | { |
264 | have_begin_probes = true; | |
265 | s.op->newline() << "enter_begin_probe (& " << probes[i]->name << ");"; | |
266 | } | |
267 | ||
268 | // If any of the begin probes signaled an error, indicate | |
269 | // failure to the rest of systemtap_module_init. | |
270 | if (have_begin_probes) | |
271 | s.op->newline() << "rc = (atomic_read (&session_state) == STAP_SESSION_ERROR);"; | |
dc38c0ae DS |
272 | } |
273 | ||
46b84a80 | 274 | void |
b20febf3 | 275 | be_derived_probe_group::emit_module_exit (systemtap_session& s) |
46b84a80 | 276 | { |
b20febf3 | 277 | // if (probes.empty()) return; |
16e8f21f | 278 | sort(probes.begin(), probes.end(), be_derived_probe::comp); |
46b84a80 | 279 | for (unsigned i=0; i < probes.size (); i++) |
b20febf3 FCE |
280 | if (! probes[i]->begin) // note polarity |
281 | s.op->newline() << "enter_end_probe (& " << probes[i]->name << ");"; | |
46b84a80 DS |
282 | } |
283 | ||
dc38c0ae | 284 | |
b20febf3 | 285 | |
6e3347a9 FCE |
286 | // ------------------------------------------------------------------------ |
287 | // never probes are never run | |
288 | // ------------------------------------------------------------------------ | |
289 | ||
290 | struct never_derived_probe: public derived_probe | |
291 | { | |
292 | never_derived_probe (probe* p): derived_probe (p) {} | |
293 | never_derived_probe (probe* p, probe_point* l): derived_probe (p, l) {} | |
78f6bba6 | 294 | void join_group (systemtap_session&) { /* thus no probe_group */ } |
dc38c0ae DS |
295 | }; |
296 | ||
297 | ||
6e3347a9 FCE |
298 | struct never_builder: public derived_probe_builder |
299 | { | |
300 | never_builder() {} | |
78f6bba6 | 301 | virtual void build(systemtap_session &, |
6e3347a9 FCE |
302 | probe * base, |
303 | probe_point * location, | |
78f6bba6 | 304 | std::map<std::string, literal *> const &, |
6e3347a9 FCE |
305 | vector<derived_probe *> & finished_results) |
306 | { | |
307 | finished_results.push_back(new never_derived_probe(base, location)); | |
308 | } | |
309 | }; | |
310 | ||
311 | ||
b20febf3 | 312 | |
56e12059 | 313 | // ------------------------------------------------------------------------ |
b20febf3 | 314 | // Dwarf derived probes. "We apologize for the inconvience." |
b55bc428 | 315 | // ------------------------------------------------------------------------ |
bd2b1e68 | 316 | |
c239d28c GH |
317 | static string TOK_PROCESS("process"); |
318 | static string TOK_KERNEL("kernel"); | |
319 | static string TOK_MODULE("module"); | |
320 | ||
321 | static string TOK_FUNCTION("function"); | |
54efe513 | 322 | static string TOK_INLINE("inline"); |
c239d28c | 323 | static string TOK_RETURN("return"); |
c9bad430 | 324 | static string TOK_MAXACTIVE("maxactive"); |
c239d28c GH |
325 | static string TOK_CALLEES("callees"); |
326 | ||
327 | static string TOK_STATEMENT("statement"); | |
328 | static string TOK_LABEL("label"); | |
329 | static string TOK_RELATIVE("relative"); | |
330 | ||
59ff2773 | 331 | |
20e4a32c | 332 | struct |
7e1279ea FCE |
333 | func_info |
334 | { | |
20e4a32c | 335 | func_info() |
b6581717 GH |
336 | : decl_file(NULL), decl_line(-1), prologue_end(0) |
337 | { | |
338 | memset(&die, 0, sizeof(die)); | |
339 | } | |
7e1279ea | 340 | string name; |
4cd232e4 GH |
341 | char const * decl_file; |
342 | int decl_line; | |
7e1279ea FCE |
343 | Dwarf_Die die; |
344 | Dwarf_Addr prologue_end; | |
345 | }; | |
346 | ||
347 | struct | |
348 | inline_instance_info | |
349 | { | |
20e4a32c | 350 | inline_instance_info() |
b6581717 GH |
351 | : decl_file(NULL), decl_line(-1) |
352 | { | |
353 | memset(&die, 0, sizeof(die)); | |
354 | } | |
7e1279ea | 355 | string name; |
4cd232e4 GH |
356 | char const * decl_file; |
357 | int decl_line; | |
7e1279ea FCE |
358 | Dwarf_Die die; |
359 | }; | |
360 | ||
c8959a29 GH |
361 | class |
362 | symbol_cache | |
363 | { | |
364 | // For each module, we keep a multimap from function names to | |
365 | // (cudie, funcdie*) pairs. The first time we pass over a module, | |
366 | // we build up this multimap as an index. Our iteration over the | |
367 | // module's CUs and functions is then driven by the function or | |
368 | // statement pattern string we're scanning for. | |
369 | struct entry | |
370 | { | |
371 | Dwarf_Die cu; | |
372 | Dwarf_Die function; | |
373 | }; | |
374 | typedef multimap<string, entry> index; | |
375 | map<Dwarf *, index*> indices; | |
376 | index *curr_index; | |
377 | Dwarf_Die * cu_die; | |
378 | void make_entry_for_function(Dwarf_Die *func_die); | |
379 | static int function_callback(Dwarf_Die * func, void * arg); | |
380 | void index_module(Dwarf * mod); | |
e38d6504 | 381 | public: |
c8959a29 GH |
382 | void select_die_subsets(Dwarf * mod, |
383 | string const & pattern, | |
384 | set<Dwarf_Die> & cus, | |
385 | multimap<Dwarf_Die, Dwarf_Die> & funcs); | |
386 | }; | |
387 | ||
388 | void | |
389 | symbol_cache::make_entry_for_function(Dwarf_Die *func_die) | |
390 | { | |
391 | entry e; | |
392 | assert(this->cu_die); | |
393 | assert(this->curr_index); | |
394 | e.cu = *(this->cu_die); | |
395 | e.function = *(func_die); | |
396 | char const * fname = dwarf_diename(func_die); | |
397 | if (fname) | |
398 | curr_index->insert(make_pair(string(fname), e)); | |
399 | } | |
400 | ||
401 | int | |
402 | symbol_cache::function_callback(Dwarf_Die * func, void * arg) | |
403 | { | |
404 | symbol_cache *sym = static_cast<symbol_cache*>(arg); | |
405 | sym->make_entry_for_function(func); | |
406 | return DWARF_CB_OK; | |
407 | } | |
408 | ||
409 | void | |
410 | symbol_cache::index_module(Dwarf *module_dwarf) | |
411 | { | |
412 | Dwarf_Off off = 0; | |
413 | size_t cuhl = 0; | |
414 | Dwarf_Off noff = 0; | |
415 | this->cu_die = NULL; | |
416 | while (dwarf_nextcu (module_dwarf, off, &noff, &cuhl, NULL, NULL, NULL) == 0) | |
417 | { | |
418 | Dwarf_Die die_mem; | |
419 | this->cu_die = dwarf_offdie (module_dwarf, off + cuhl, &die_mem); | |
420 | dwarf_getfuncs (this->cu_die, function_callback, this, 0); | |
421 | off = noff; | |
422 | } | |
423 | this->cu_die = NULL; | |
424 | } | |
425 | ||
426 | inline bool | |
e38d6504 | 427 | operator<(Dwarf_Die const & a, |
c8959a29 GH |
428 | Dwarf_Die const & b) |
429 | { | |
430 | return (a.addr < b.addr) | |
431 | || ((a.addr == b.addr) && (a.cu < b.cu)) | |
432 | || ((a.addr == b.addr) && (a.cu == b.cu) && (a.abbrev < b.abbrev)); | |
433 | } | |
434 | ||
435 | inline bool | |
e38d6504 | 436 | operator==(Dwarf_Die const & a, |
c8959a29 GH |
437 | Dwarf_Die const & b) |
438 | { | |
439 | return !((a < b) || (b < a)); | |
440 | } | |
441 | ||
e38d6504 | 442 | void |
c8959a29 GH |
443 | symbol_cache::select_die_subsets(Dwarf *mod, |
444 | string const & pattern, | |
445 | set<Dwarf_Die> & cus, | |
446 | multimap<Dwarf_Die, Dwarf_Die> & funcs) | |
447 | { | |
448 | cus.clear(); | |
449 | funcs.clear(); | |
450 | index *ix = NULL; | |
451 | ||
452 | // First find the index for this module. If there's no index, build | |
453 | // one. | |
454 | map<Dwarf *, index*>::const_iterator i = indices.find(mod); | |
455 | if (i == indices.end()) | |
456 | { | |
457 | this->curr_index = new index; | |
e38d6504 | 458 | index_module(mod); |
c8959a29 GH |
459 | indices.insert(make_pair(mod, this->curr_index)); |
460 | ix = this->curr_index; | |
461 | this->curr_index = NULL; | |
462 | this->cu_die = NULL; | |
463 | } | |
464 | else | |
465 | ix = i->second; | |
466 | ||
467 | assert(ix); | |
468 | ||
469 | // Now stem the pattern such that we have a minimal non-wildcard | |
470 | // prefix to search in the multimap for. We will use the full pattern | |
471 | // to narrow this set further. | |
472 | string stem; | |
473 | for (string::const_iterator i = pattern.begin(); | |
474 | i != pattern.end(); ++i) | |
475 | { | |
476 | if (*i == '?' || *i == '*' || *i == '[' || *i == ']') | |
477 | break; | |
478 | stem += *i; | |
479 | } | |
480 | ||
481 | // Now perform a lower-bound on the multimap, refine that result | |
482 | // set, and copy the CU and function DIEs into the parameter sets. | |
483 | index::const_iterator j = stem.empty() ? ix->begin() : ix->lower_bound(stem); | |
e38d6504 | 484 | while (j != ix->end() && |
c8959a29 GH |
485 | (stem.empty() || j->first.compare(0, stem.size(), stem) == 0)) |
486 | { | |
487 | if (fnmatch(pattern.c_str(), j->first.c_str(), 0) == 0) | |
488 | { | |
489 | cus.insert(j->second.cu); | |
490 | funcs.insert(make_pair(j->second.cu, j->second.function)); | |
491 | } | |
e38d6504 | 492 | ++j; |
c8959a29 GH |
493 | } |
494 | } | |
e38d6504 | 495 | |
c8959a29 GH |
496 | |
497 | ||
7e1279ea FCE |
498 | static int |
499 | query_cu (Dwarf_Die * cudie, void * arg); | |
59ff2773 FCE |
500 | |
501 | ||
bd2b1e68 GH |
502 | // Helper for dealing with selected portions of libdwfl in a more readable |
503 | // fashion, and with specific cleanup / checking / logging options. | |
504 | ||
91eefb1c GH |
505 | static const char * |
506 | dwarf_diename_integrate (Dwarf_Die *die) | |
507 | { | |
508 | Dwarf_Attribute attr_mem; | |
509 | return dwarf_formstring (dwarf_attr_integrate (die, DW_AT_name, &attr_mem)); | |
510 | } | |
511 | ||
b20febf3 | 512 | struct dwflpp |
bd2b1e68 | 513 | { |
5227f1ea | 514 | systemtap_session & sess; |
bd2b1e68 GH |
515 | Dwfl * dwfl; |
516 | ||
c8959a29 GH |
517 | symbol_cache cache; |
518 | ||
bd2b1e68 GH |
519 | // These are "current" values we focus on. |
520 | Dwfl_Module * module; | |
521 | Dwarf * module_dwarf; | |
522 | Dwarf_Addr module_bias; | |
50e0d793 GH |
523 | |
524 | // These describe the current module's PC address range | |
525 | Dwarf_Addr module_start; | |
526 | Dwarf_Addr module_end; | |
527 | ||
bd2b1e68 | 528 | Dwarf_Die * cu; |
20e4a32c | 529 | Dwarf_Die * function; |
bd2b1e68 | 530 | |
c8959a29 GH |
531 | set<Dwarf_Die> pattern_limited_cus; |
532 | multimap<Dwarf_Die, Dwarf_Die> pattern_limited_funcs; | |
533 | ||
bd2b1e68 GH |
534 | string module_name; |
535 | string cu_name; | |
536 | string function_name; | |
537 | ||
7a053d3b | 538 | string const default_name(char const * in, |
78f6bba6 | 539 | char const *) |
bd2b1e68 | 540 | { |
7a053d3b | 541 | if (in) |
bd2b1e68 | 542 | return in; |
a229fcd7 | 543 | return string(""); |
bd2b1e68 GH |
544 | } |
545 | ||
50e0d793 | 546 | |
8d695876 | 547 | void get_module_dwarf(bool required = false) |
5227f1ea GH |
548 | { |
549 | if (!module_dwarf) | |
550 | module_dwarf = dwfl_module_getdwarf(module, &module_bias); | |
7e1279ea | 551 | |
0ce64fb8 FCE |
552 | if (!module_dwarf) |
553 | { | |
554 | string msg = "cannot find "; | |
555 | if (module_name == "") | |
556 | msg += "kernel"; | |
557 | else | |
558 | msg += string("module ") + module_name; | |
559 | msg += " debuginfo"; | |
560 | ||
561 | int i = dwfl_errno(); | |
562 | if (i) | |
563 | msg += string(": ") + dwfl_errmsg (i); | |
564 | ||
565 | if (required) | |
566 | throw semantic_error (msg); | |
567 | else | |
db22e55f | 568 | cerr << "WARNING: " << msg << "\n"; |
0ce64fb8 | 569 | } |
5227f1ea GH |
570 | } |
571 | ||
c8959a29 GH |
572 | void limit_search_to_function_pattern(string const & pattern) |
573 | { | |
8d695876 | 574 | get_module_dwarf(false); |
e38d6504 RM |
575 | cache.select_die_subsets(module_dwarf, pattern, |
576 | pattern_limited_cus, | |
c8959a29 GH |
577 | pattern_limited_funcs); |
578 | } | |
50e0d793 | 579 | |
bd2b1e68 GH |
580 | void focus_on_module(Dwfl_Module * m) |
581 | { | |
582 | assert(m); | |
583 | module = m; | |
7a053d3b | 584 | module_name = default_name(dwfl_module_info(module, NULL, |
50e0d793 | 585 | &module_start, &module_end, |
bd2b1e68 GH |
586 | NULL, NULL, |
587 | NULL, NULL), | |
588 | "module"); | |
50e0d793 GH |
589 | |
590 | // Reset existing pointers and names | |
591 | ||
592 | module_dwarf = NULL; | |
593 | ||
c8959a29 GH |
594 | pattern_limited_cus.clear(); |
595 | pattern_limited_funcs.clear(); | |
e38d6504 | 596 | |
a229fcd7 | 597 | cu_name.clear(); |
50e0d793 GH |
598 | cu = NULL; |
599 | ||
a229fcd7 | 600 | function_name.clear(); |
50e0d793 | 601 | function = NULL; |
bd2b1e68 GH |
602 | } |
603 | ||
50e0d793 | 604 | |
bd2b1e68 GH |
605 | void focus_on_cu(Dwarf_Die * c) |
606 | { | |
607 | assert(c); | |
50e0d793 GH |
608 | assert(module); |
609 | ||
bd2b1e68 | 610 | cu = c; |
50e0d793 GH |
611 | cu_name = default_name(dwarf_diename(c), "CU"); |
612 | ||
613 | // Reset existing pointers and names | |
a229fcd7 | 614 | function_name.clear(); |
50e0d793 | 615 | function = NULL; |
bd2b1e68 GH |
616 | } |
617 | ||
50e0d793 | 618 | |
20e4a32c | 619 | void focus_on_function(Dwarf_Die * f) |
bd2b1e68 GH |
620 | { |
621 | assert(f); | |
50e0d793 GH |
622 | assert(module); |
623 | assert(cu); | |
624 | ||
bd2b1e68 | 625 | function = f; |
20e4a32c | 626 | function_name = default_name(dwarf_diename(function), |
bd2b1e68 | 627 | "function"); |
bd2b1e68 GH |
628 | } |
629 | ||
50e0d793 | 630 | |
bd2b1e68 GH |
631 | void focus_on_module_containing_global_address(Dwarf_Addr a) |
632 | { | |
633 | assert(dwfl); | |
50e0d793 | 634 | cu = NULL; |
0ce64fb8 FCE |
635 | Dwfl_Module* mod = dwfl_addrmodule(dwfl, a); |
636 | if (mod) // address could be wildly out of range | |
637 | focus_on_module(mod); | |
bd2b1e68 GH |
638 | } |
639 | ||
50e0d793 | 640 | |
7e1279ea | 641 | void query_cu_containing_global_address(Dwarf_Addr a, void *arg) |
bd2b1e68 | 642 | { |
bd2b1e68 | 643 | Dwarf_Addr bias; |
50e0d793 | 644 | assert(dwfl); |
5227f1ea | 645 | get_module_dwarf(); |
ab55a5ae FCE |
646 | Dwarf_Die* cudie = dwfl_module_addrdie(module, a, &bias); |
647 | if (cudie) // address could be wildly out of range | |
648 | query_cu (cudie, arg); | |
bd2b1e68 GH |
649 | assert(bias == module_bias); |
650 | } | |
651 | ||
50e0d793 | 652 | |
7e1279ea | 653 | void query_cu_containing_module_address(Dwarf_Addr a, void *arg) |
bd2b1e68 | 654 | { |
7e1279ea | 655 | query_cu_containing_global_address(module_address_to_global(a), arg); |
bd2b1e68 GH |
656 | } |
657 | ||
50e0d793 | 658 | |
bd2b1e68 GH |
659 | Dwarf_Addr module_address_to_global(Dwarf_Addr a) |
660 | { | |
50e0d793 | 661 | assert(dwfl); |
bd2b1e68 | 662 | assert(module); |
5227f1ea | 663 | get_module_dwarf(); |
c239d28c GH |
664 | if (module_name == TOK_KERNEL) |
665 | return a; | |
50e0d793 | 666 | return a + module_start; |
bd2b1e68 GH |
667 | } |
668 | ||
50e0d793 | 669 | |
bd2b1e68 GH |
670 | Dwarf_Addr global_address_to_module(Dwarf_Addr a) |
671 | { | |
672 | assert(module); | |
5227f1ea | 673 | get_module_dwarf(); |
bd2b1e68 GH |
674 | return a - module_bias; |
675 | } | |
676 | ||
677 | ||
678 | bool module_name_matches(string pattern) | |
679 | { | |
680 | assert(module); | |
681 | bool t = (fnmatch(pattern.c_str(), module_name.c_str(), 0) == 0); | |
b0ee93c4 | 682 | if (t && sess.verbose>2) |
bd2b1e68 | 683 | clog << "pattern '" << pattern << "' " |
24cb178f | 684 | << "matches " |
db22e55f | 685 | << "module '" << module_name << "'" << "\n"; |
bd2b1e68 GH |
686 | return t; |
687 | } | |
688 | ||
50e0d793 | 689 | |
bd2b1e68 GH |
690 | bool function_name_matches(string pattern) |
691 | { | |
692 | assert(function); | |
693 | bool t = (fnmatch(pattern.c_str(), function_name.c_str(), 0) == 0); | |
b0ee93c4 | 694 | if (t && sess.verbose>2) |
bd2b1e68 | 695 | clog << "pattern '" << pattern << "' " |
24cb178f | 696 | << "matches " |
db22e55f | 697 | << "function '" << function_name << "'" << "\n"; |
bd2b1e68 GH |
698 | return t; |
699 | } | |
700 | ||
50e0d793 | 701 | |
bd2b1e68 GH |
702 | bool cu_name_matches(string pattern) |
703 | { | |
704 | assert(cu); | |
705 | bool t = (fnmatch(pattern.c_str(), cu_name.c_str(), 0) == 0); | |
b0ee93c4 | 706 | if (t && sess.verbose>2) |
bd2b1e68 | 707 | clog << "pattern '" << pattern << "' " |
24cb178f | 708 | << "matches " |
db22e55f | 709 | << "CU '" << cu_name << "'" << "\n"; |
bd2b1e68 GH |
710 | return t; |
711 | } | |
712 | ||
50e0d793 | 713 | |
b40af7ee | 714 | // NB: "rc == 0" means OK in this case |
c931ec8a | 715 | static void dwfl_assert(string desc, int rc, string extra_msg = "") |
bd2b1e68 | 716 | { |
7e1279ea | 717 | string msg = "libdwfl failure (" + desc + "): "; |
d8067b24 FCE |
718 | if (rc < 0) msg += dwfl_errmsg (rc); |
719 | else if (rc > 0) msg += strerror (rc); | |
bd2b1e68 | 720 | if (rc != 0) |
b40af7ee DS |
721 | { |
722 | if (extra_msg.length() > 0) | |
723 | msg += "\n" + extra_msg; | |
724 | throw semantic_error (msg); | |
725 | } | |
bd2b1e68 GH |
726 | } |
727 | ||
7e1279ea FCE |
728 | void dwarf_assert(string desc, int rc) // NB: "rc == 0" means OK in this case |
729 | { | |
730 | string msg = "libdw failure (" + desc + "): "; | |
731 | if (rc < 0) msg += dwarf_errmsg (rc); | |
732 | else if (rc > 0) msg += strerror (rc); | |
733 | if (rc != 0) | |
734 | throw semantic_error (msg); | |
735 | } | |
736 | ||
50e0d793 | 737 | |
5227f1ea | 738 | dwflpp(systemtap_session & sess) |
bd2b1e68 | 739 | : |
5227f1ea | 740 | sess(sess), |
bd2b1e68 GH |
741 | dwfl(NULL), |
742 | module(NULL), | |
743 | module_dwarf(NULL), | |
744 | module_bias(0), | |
50e0d793 GH |
745 | module_start(0), |
746 | module_end(0), | |
bd2b1e68 GH |
747 | cu(NULL), |
748 | function(NULL) | |
749 | {} | |
7a053d3b | 750 | |
50e0d793 | 751 | |
bd2b1e68 GH |
752 | void setup(bool kernel) |
753 | { | |
b5d77020 | 754 | // XXX: this is where the session -R parameter could come in |
c72dc86c JS |
755 | static char debuginfo_path_arr[] = "-:.debug:/usr/lib/debug"; |
756 | static char *debuginfo_path = debuginfo_path_arr; | |
b5d77020 | 757 | |
bd2b1e68 GH |
758 | static const Dwfl_Callbacks proc_callbacks = |
759 | { | |
760 | dwfl_linux_proc_find_elf, | |
761 | dwfl_standard_find_debuginfo, | |
762 | NULL, | |
b5d77020 | 763 | & debuginfo_path |
bd2b1e68 | 764 | }; |
7a053d3b | 765 | |
bd2b1e68 GH |
766 | static const Dwfl_Callbacks kernel_callbacks = |
767 | { | |
768 | dwfl_linux_kernel_find_elf, | |
769 | dwfl_standard_find_debuginfo, | |
b20febf3 | 770 | dwfl_offline_section_address, |
b5d77020 | 771 | & debuginfo_path |
bd2b1e68 GH |
772 | }; |
773 | ||
774 | if (kernel) | |
775 | { | |
7e1279ea | 776 | dwfl = dwfl_begin (&kernel_callbacks); |
bd2b1e68 | 777 | if (!dwfl) |
7e1279ea FCE |
778 | throw semantic_error ("cannot open dwfl"); |
779 | dwfl_report_begin (dwfl); | |
b20febf3 | 780 | |
822a1ad1 | 781 | dwfl_assert ("missing kernel debuginfo", |
b20febf3 FCE |
782 | dwfl_linux_kernel_report_offline |
783 | (dwfl, | |
784 | sess.kernel_release.c_str(), | |
785 | NULL /* selection predicate */)); | |
786 | ||
787 | // XXX: it would be nice if we could do a single | |
788 | // ..._report_offline call for an entire systemtap script, so | |
789 | // that a selection predicate would filter out modules outside | |
790 | // the union of all the requested wildcards. But we build | |
791 | // derived_probes one-by-one and we don't have lookahead. | |
792 | ||
793 | // XXX: a special case: if we have only kernel.* probe points, | |
794 | // we shouldn't waste time looking for module debug-info (and | |
795 | // vice versa). | |
796 | ||
797 | // NB: the result of an _offline call is the assignment of | |
798 | // virtualized addresses to relocatable objects such as | |
799 | // modules. These have to be converted to real addresses at | |
800 | // run time. See the dwarf_derived_probe ctor and its caller. | |
bd2b1e68 GH |
801 | } |
802 | else | |
803 | { | |
7e1279ea FCE |
804 | dwfl = dwfl_begin (&proc_callbacks); |
805 | dwfl_report_begin (dwfl); | |
bd2b1e68 | 806 | if (!dwfl) |
7e1279ea | 807 | throw semantic_error ("cannot open dwfl"); |
b20febf3 FCE |
808 | |
809 | throw semantic_error ("user-space probes not yet implemented"); | |
bd2b1e68 GH |
810 | // XXX: Find pids or processes, do userspace stuff. |
811 | } | |
812 | ||
7e1279ea | 813 | dwfl_assert ("dwfl_report_end", dwfl_report_end(dwfl, NULL, NULL)); |
bd2b1e68 GH |
814 | } |
815 | ||
b20febf3 FCE |
816 | void cleanup () // XXX: never used |
817 | { | |
818 | dwfl_end (dwfl); | |
819 | dwfl = NULL; | |
820 | } | |
821 | ||
bd2b1e68 GH |
822 | void iterate_over_modules(int (* callback)(Dwfl_Module *, void **, |
823 | const char *, Dwarf_Addr, | |
77de5e9e | 824 | void *), |
bd2b1e68 GH |
825 | void * data) |
826 | { | |
bd2b1e68 GH |
827 | ptrdiff_t off = 0; |
828 | do | |
829 | { | |
77de5e9e | 830 | off = dwfl_getmodules (dwfl, callback, data, off); |
bd2b1e68 GH |
831 | } |
832 | while (off > 0); | |
7e1279ea | 833 | dwfl_assert("dwfl_getmodules", off); |
bd2b1e68 GH |
834 | } |
835 | ||
7e1279ea | 836 | |
7a053d3b | 837 | void iterate_over_cus (int (*callback)(Dwarf_Die * die, void * arg), |
bd2b1e68 GH |
838 | void * data) |
839 | { | |
0ce64fb8 | 840 | get_module_dwarf(false); |
5227f1ea | 841 | |
bd2b1e68 | 842 | if (!module_dwarf) |
0ce64fb8 | 843 | return; |
bd2b1e68 | 844 | |
c8959a29 GH |
845 | for (set<Dwarf_Die>::const_iterator i = pattern_limited_cus.begin(); |
846 | i != pattern_limited_cus.end(); ++i) | |
7a053d3b | 847 | { |
c8959a29 GH |
848 | Dwarf_Die die = *i; |
849 | if (callback (&die, data) != DWARF_CB_OK) | |
bd2b1e68 | 850 | break; |
bd2b1e68 GH |
851 | } |
852 | } | |
853 | ||
bd2b1e68 | 854 | |
7e1279ea | 855 | bool func_is_inline() |
bd2b1e68 | 856 | { |
7e1279ea FCE |
857 | assert (function); |
858 | return dwarf_func_inline (function) != 0; | |
bd2b1e68 GH |
859 | } |
860 | ||
7e1279ea FCE |
861 | void iterate_over_inline_instances (int (* callback)(Dwarf_Die * die, void * arg), |
862 | void * data) | |
bd2b1e68 | 863 | { |
7e1279ea FCE |
864 | assert (function); |
865 | assert (func_is_inline ()); | |
20e4a32c | 866 | dwarf_assert ("dwarf_func_inline_instances", |
7e1279ea | 867 | dwarf_func_inline_instances (function, callback, data)); |
4fa7b22b | 868 | } |
bd2b1e68 | 869 | |
50e0d793 | 870 | |
20e4a32c | 871 | void iterate_over_functions (int (* callback)(Dwarf_Die * func, void * arg), |
7e1279ea | 872 | void * data) |
4fa7b22b | 873 | { |
7e1279ea FCE |
874 | assert (module); |
875 | assert (cu); | |
c8959a29 GH |
876 | multimap<Dwarf_Die, Dwarf_Die>::const_iterator i = pattern_limited_funcs.lower_bound(*cu); |
877 | while (i != pattern_limited_funcs.end() && (i->first == *cu)) | |
878 | { | |
879 | Dwarf_Die func_die = i->second; | |
880 | if (callback (&func_die, data) != DWARF_CB_OK) | |
881 | break; | |
882 | ||
883 | ++i; | |
884 | } | |
7e1279ea | 885 | } |
c239d28c | 886 | |
d9b516ca | 887 | |
897820ca GH |
888 | bool has_single_line_record (char const * srcfile, int lineno) |
889 | { | |
890 | if (lineno < 0) | |
891 | return false; | |
892 | ||
893 | Dwarf_Line **srcsp = NULL; | |
894 | size_t nsrcs = 0; | |
895 | ||
896 | dwarf_assert ("dwarf_getsrc_file", | |
20e4a32c | 897 | dwarf_getsrc_file (module_dwarf, |
897820ca GH |
898 | srcfile, lineno, 0, |
899 | &srcsp, &nsrcs)); | |
20e4a32c | 900 | |
897820ca GH |
901 | return nsrcs == 1; |
902 | } | |
903 | ||
7e1279ea | 904 | void iterate_over_srcfile_lines (char const * srcfile, |
20e4a32c | 905 | int lineno, |
897820ca | 906 | bool need_single_match, |
20e4a32c | 907 | void (* callback) (Dwarf_Line * line, void * arg), |
7e1279ea FCE |
908 | void *data) |
909 | { | |
6315bd76 GH |
910 | Dwarf_Line **srcsp = NULL; |
911 | size_t nsrcs = 0; | |
bb788f9f | 912 | |
7e1279ea | 913 | get_module_dwarf(); |
bb788f9f | 914 | |
7e1279ea | 915 | dwarf_assert ("dwarf_getsrc_file", |
20e4a32c | 916 | dwarf_getsrc_file (module_dwarf, |
7e1279ea FCE |
917 | srcfile, lineno, 0, |
918 | &srcsp, &nsrcs)); | |
20e4a32c | 919 | |
114ffac2 | 920 | if (need_single_match && nsrcs > 1) |
897820ca GH |
921 | { |
922 | // We wanted a single line record (a unique address for the | |
923 | // line) and we got a bunch of line records. We're going to | |
924 | // skip this probe (throw an exception) but before we throw | |
925 | // we're going to look around a bit to see if there's a low or | |
926 | // high line number nearby which *doesn't* have this problem, | |
927 | // so we can give the user some advice. | |
928 | ||
929 | int lo_try = -1; | |
930 | int hi_try = -1; | |
114ffac2 | 931 | for (size_t i = 1; i < 6; ++i) |
897820ca GH |
932 | { |
933 | if (lo_try == -1 && has_single_line_record(srcfile, lineno - i)) | |
934 | lo_try = lineno - i; | |
935 | ||
936 | if (hi_try == -1 && has_single_line_record(srcfile, lineno + i)) | |
937 | hi_try = lineno + i; | |
938 | } | |
939 | ||
940 | string advice = ""; | |
941 | if (lo_try > 0 || hi_try > 0) | |
20e4a32c RM |
942 | advice = " (try " |
943 | + (lo_try > 0 | |
897820ca GH |
944 | ? (string(srcfile) + ":" + lex_cast<string>(lo_try)) |
945 | : string("")) | |
946 | + (lo_try > 0 && hi_try > 0 ? " or " : "") | |
20e4a32c | 947 | + (hi_try > 0 |
897820ca GH |
948 | ? (string(srcfile) + ":"+ lex_cast<string>(hi_try)) |
949 | : string("")) | |
950 | + ")"; | |
951 | ||
20e4a32c RM |
952 | throw semantic_error("multiple addresses for " |
953 | + string(srcfile) | |
897820ca GH |
954 | + ":" |
955 | + lex_cast<string>(lineno) | |
956 | + advice); | |
957 | } | |
958 | ||
20e4a32c | 959 | try |
bb788f9f | 960 | { |
6315bd76 GH |
961 | for (size_t i = 0; i < nsrcs; ++i) |
962 | { | |
963 | callback (srcsp[i], data); | |
964 | } | |
bb788f9f | 965 | } |
6315bd76 GH |
966 | catch (...) |
967 | { | |
968 | free (srcsp); | |
969 | throw; | |
20e4a32c | 970 | } |
6315bd76 | 971 | free (srcsp); |
50e0d793 GH |
972 | } |
973 | ||
974 | ||
7e1279ea FCE |
975 | void collect_srcfiles_matching (string const & pattern, |
976 | set<char const *> & filtered_srcfiles) | |
50e0d793 | 977 | { |
7e1279ea FCE |
978 | assert (module); |
979 | assert (cu); | |
bb788f9f | 980 | |
7e1279ea FCE |
981 | size_t nfiles; |
982 | Dwarf_Files *srcfiles; | |
bb788f9f | 983 | |
20e4a32c | 984 | dwarf_assert ("dwarf_getsrcfiles", |
7e1279ea FCE |
985 | dwarf_getsrcfiles (cu, &srcfiles, &nfiles)); |
986 | { | |
987 | for (size_t i = 0; i < nfiles; ++i) | |
50e0d793 | 988 | { |
7e1279ea FCE |
989 | char const * fname = dwarf_filesrc (srcfiles, i, NULL, NULL); |
990 | if (fnmatch (pattern.c_str(), fname, 0) == 0) | |
50e0d793 | 991 | { |
7e1279ea | 992 | filtered_srcfiles.insert (fname); |
b0ee93c4 | 993 | if (sess.verbose>2) |
db22e55f | 994 | clog << "selected source file '" << fname << "'\n"; |
50e0d793 GH |
995 | } |
996 | } | |
7e1279ea | 997 | } |
20e4a32c | 998 | } |
50e0d793 | 999 | |
7e1279ea | 1000 | void resolve_prologue_endings (map<Dwarf_Addr, func_info> & funcs) |
7d71e1d5 FCE |
1001 | { |
1002 | // This heuristic attempts to pick the first address that has a | |
34ca7d84 FCE |
1003 | // source line distinct from the function declaration's. In a |
1004 | // perfect world, this would be the first statement *past* the | |
1005 | // prologue. | |
1006 | ||
7d71e1d5 FCE |
1007 | assert(module); |
1008 | assert(cu); | |
1009 | ||
456aa31c FCE |
1010 | size_t nlines = 0; |
1011 | Dwarf_Lines *lines = NULL; | |
7d71e1d5 | 1012 | |
dc223023 FCE |
1013 | /* trouble cases: |
1014 | malloc do_symlink in init/initramfs.c tail-recursive/tiny then no-prologue | |
1015 | sys_get?id in kernel/timer.c no-prologue | |
1016 | sys_exit_group tail-recursive | |
1017 | {do_,}sys_open extra-long-prologue (gcc 3.4) | |
1018 | cpu_to_logical_apicid NULL-decl_file | |
1019 | */ | |
1020 | ||
1021 | // Fetch all srcline records, sorted by address. | |
20e4a32c RM |
1022 | dwarf_assert ("dwarf_getsrclines", |
1023 | dwarf_getsrclines(cu, &lines, &nlines)); | |
dc223023 | 1024 | // XXX: free lines[] later, but how? |
7d71e1d5 | 1025 | |
dc223023 | 1026 | for(map<Dwarf_Addr,func_info>::iterator it = funcs.begin(); it != funcs.end(); it++) |
7d71e1d5 | 1027 | { |
dc223023 FCE |
1028 | #if 0 /* someday */ |
1029 | Dwarf_Addr* bkpts = 0; | |
1030 | int n = dwarf_entry_breakpoints (& it->second.die, & bkpts); | |
1031 | // ... | |
1032 | free (bkpts); | |
1033 | #endif | |
20e4a32c | 1034 | |
dc223023 FCE |
1035 | Dwarf_Addr entrypc = it->first; |
1036 | Dwarf_Addr highpc; // NB: highpc is exclusive: [entrypc,highpc) | |
1037 | func_info* func = &it->second; | |
e38d6504 | 1038 | dwfl_assert ("dwarf_highpc", dwarf_highpc (& func->die, |
dc223023 FCE |
1039 | & highpc)); |
1040 | ||
1041 | if (func->decl_file == 0) func->decl_file = ""; | |
e38d6504 | 1042 | |
dc223023 FCE |
1043 | unsigned entrypc_srcline_idx = 0; |
1044 | Dwarf_Line* entrypc_srcline = 0; | |
1045 | // open-code binary search for exact match | |
1046 | { | |
1047 | unsigned l = 0, h = nlines; | |
1048 | while (l < h) | |
1049 | { | |
1050 | entrypc_srcline_idx = (l + h) / 2; | |
1051 | Dwarf_Addr addr; | |
1052 | Dwarf_Line *lr = dwarf_onesrcline(lines, entrypc_srcline_idx); | |
1053 | dwarf_lineaddr (lr, &addr); | |
1054 | if (addr == entrypc) { entrypc_srcline = lr; break; } | |
1055 | else if (l + 1 == h) { break; } // ran off bottom of tree | |
1056 | else if (addr < entrypc) { l = entrypc_srcline_idx; } | |
1057 | else { h = entrypc_srcline_idx; } | |
e38d6504 | 1058 | } |
dc223023 | 1059 | } |
e38d6504 RM |
1060 | if (entrypc_srcline == 0) |
1061 | throw semantic_error ("missing entrypc dwarf line record for function '" | |
dc223023 FCE |
1062 | + func->name + "'"); |
1063 | ||
1064 | if (sess.verbose>2) | |
1065 | clog << "prologue searching function '" << func->name << "'" | |
5fe3e97f | 1066 | << " 0x" << hex << entrypc << "-0x" << highpc << dec |
dc223023 FCE |
1067 | << "@" << func->decl_file << ":" << func->decl_line |
1068 | << "\n"; | |
1069 | ||
1070 | // Now we go searching for the first line record that has a | |
1071 | // file/line different from the one in the declaration. | |
1072 | // Normally, this will be the next one. BUT: | |
1073 | // | |
1074 | // We may have to skip a few because some old compilers plop | |
1075 | // in dummy line records for longer prologues. If we go too | |
1076 | // far (addr >= highpc), we take the previous one. Or, it may | |
1077 | // be the first one, if the function had no prologue, and thus | |
1078 | // the entrypc maps to a statement in the body rather than the | |
1079 | // declaration. | |
1080 | ||
1081 | unsigned postprologue_srcline_idx = entrypc_srcline_idx; | |
1082 | bool ranoff_end = false; | |
35f5f091 | 1083 | while (postprologue_srcline_idx < nlines) |
7d71e1d5 | 1084 | { |
dc223023 FCE |
1085 | Dwarf_Addr postprologue_addr; |
1086 | Dwarf_Line *lr = dwarf_onesrcline(lines, postprologue_srcline_idx); | |
1087 | dwarf_lineaddr (lr, &postprologue_addr); | |
1088 | const char* postprologue_file = dwarf_linesrc (lr, NULL, NULL); | |
1089 | int postprologue_lineno; | |
7d71e1d5 | 1090 | dwfl_assert ("dwarf_lineno", |
dc223023 | 1091 | dwarf_lineno (lr, & postprologue_lineno)); |
456aa31c | 1092 | |
b0ee93c4 | 1093 | if (sess.verbose>2) |
dc223023 FCE |
1094 | clog << "checking line record 0x" << hex << postprologue_addr << dec |
1095 | << "@" << postprologue_file << ":" << postprologue_lineno << "\n"; | |
1096 | ||
1097 | if (postprologue_addr >= highpc) | |
e38d6504 RM |
1098 | { |
1099 | ranoff_end = true; | |
1100 | postprologue_srcline_idx --; | |
dc223023 FCE |
1101 | continue; |
1102 | } | |
1103 | if (ranoff_end || | |
1104 | (strcmp (postprologue_file, func->decl_file) || // We have a winner! | |
1105 | (postprologue_lineno != func->decl_line))) | |
1106 | { | |
1107 | func->prologue_end = postprologue_addr; | |
1108 | ||
1109 | if (sess.verbose>2) | |
1110 | { | |
1111 | clog << "prologue found function '" << func->name << "'"; | |
1112 | // Add a little classification datum | |
1113 | if (postprologue_srcline_idx == entrypc_srcline_idx) clog << " (naked)"; | |
1114 | if (ranoff_end) clog << " (tail-call?)"; | |
1115 | clog << " = 0x" << hex << postprologue_addr << dec << "\n"; | |
1116 | } | |
1117 | ||
1118 | break; | |
1119 | } | |
e38d6504 | 1120 | |
dc223023 FCE |
1121 | // Let's try the next srcline. |
1122 | postprologue_srcline_idx ++; | |
1123 | } // loop over srclines | |
7d71e1d5 | 1124 | |
dc223023 FCE |
1125 | // if (strlen(func->decl_file) == 0) func->decl_file = NULL; |
1126 | ||
1127 | } // loop over functions | |
b20febf3 FCE |
1128 | |
1129 | // XXX: how to free lines? | |
bd2b1e68 GH |
1130 | } |
1131 | ||
7e1279ea FCE |
1132 | |
1133 | bool function_entrypc (Dwarf_Addr * addr) | |
1134 | { | |
1135 | assert (function); | |
20e4a32c | 1136 | return (dwarf_entrypc (function, addr) == 0); |
7e1279ea FCE |
1137 | } |
1138 | ||
1139 | ||
1140 | bool die_entrypc (Dwarf_Die * die, Dwarf_Addr * addr) | |
1141 | { | |
1142 | Dwarf_Attribute attr_mem; | |
1143 | Dwarf_Attribute *attr = dwarf_attr (die, DW_AT_entry_pc, &attr_mem); | |
1144 | if (attr != NULL) | |
1145 | return (dwarf_formaddr (attr, addr) == 0); | |
1146 | ||
1147 | return ( dwarf_lowpc (die, addr) == 0); | |
1148 | } | |
1149 | ||
4cd232e4 GH |
1150 | void function_die (Dwarf_Die *d) |
1151 | { | |
1152 | assert (function); | |
20e4a32c | 1153 | *d = *function; |
4cd232e4 | 1154 | } |
7e1279ea | 1155 | |
4cd232e4 | 1156 | void function_file (char const ** c) |
7e1279ea FCE |
1157 | { |
1158 | assert (function); | |
4cd232e4 | 1159 | assert (c); |
20e4a32c | 1160 | *c = dwarf_decl_file (function); |
7e1279ea FCE |
1161 | } |
1162 | ||
4cd232e4 | 1163 | void function_line (int *linep) |
7e1279ea FCE |
1164 | { |
1165 | assert (function); | |
20e4a32c | 1166 | dwarf_decl_line (function, linep); |
7e1279ea FCE |
1167 | } |
1168 | ||
1169 | bool die_has_pc (Dwarf_Die * die, Dwarf_Addr pc) | |
1170 | { | |
1171 | int res = dwarf_haspc (die, pc); | |
1172 | if (res == -1) | |
1173 | dwarf_assert ("dwarf_haspc", res); | |
1174 | return res == 1; | |
1175 | } | |
1176 | ||
1177 | ||
78f6bba6 | 1178 | static void loc2c_error (void *, const char *fmt, ...) |
e36387d7 | 1179 | { |
78f6bba6 FCE |
1180 | const char *msg = "?"; |
1181 | char *tmp = NULL; | |
5ce20b7a | 1182 | int rc; |
e36387d7 RM |
1183 | va_list ap; |
1184 | va_start (ap, fmt); | |
78f6bba6 FCE |
1185 | rc = vasprintf (& tmp, fmt, ap); |
1186 | if (rc < 0) | |
1187 | msg = "?"; | |
1188 | else | |
1189 | msg = tmp; | |
e36387d7 RM |
1190 | va_end (ap); |
1191 | throw semantic_error (msg); | |
1192 | } | |
bd2b1e68 | 1193 | |
e664cf5b FCE |
1194 | // This function generates code used for addressing computations of |
1195 | // target variables. | |
e38d6504 RM |
1196 | void emit_address (struct obstack *pool, Dwarf_Addr address) |
1197 | { | |
e664cf5b FCE |
1198 | #if 0 |
1199 | // The easy but incorrect way is to just print a hard-wired | |
1200 | // constant. | |
e38d6504 | 1201 | obstack_printf (pool, "%#" PRIx64 "UL", address); |
e664cf5b | 1202 | #endif |
e38d6504 RM |
1203 | |
1204 | // Turn this address into a section-relative offset if it should be one. | |
1205 | // We emit a comment approximating the variable+offset expression that | |
1206 | // relocatable module probing code will need to have. | |
1207 | Dwfl_Module *mod = dwfl_addrmodule (dwfl, address); | |
1208 | dwfl_assert ("dwfl_addrmodule", mod == NULL); | |
1209 | int n = dwfl_module_relocations (mod); | |
1210 | dwfl_assert ("dwfl_module_relocations", n < 0); | |
1211 | if (n > 0) | |
1212 | { | |
1213 | int i = dwfl_module_relocate_address (mod, &address); | |
1214 | dwfl_assert ("dwfl_module_relocate_address", i < 0); | |
1215 | const char *modname = dwfl_module_info (mod, NULL, NULL, NULL, | |
1216 | NULL, NULL, NULL, NULL); | |
1217 | dwfl_assert ("dwfl_module_info", modname == NULL); | |
1218 | const char *secname = dwfl_module_relocation_info (mod, i, NULL); | |
1219 | dwfl_assert ("dwfl_module_relocation_info", secname == NULL); | |
1220 | if (n > 1 || secname[0] != '\0') | |
7e41d3dc FCE |
1221 | { |
1222 | // This gives us the module name, and section name within the | |
1223 | // module, for a kernel module (or other ET_REL module object). | |
1224 | obstack_printf (pool, "({ static unsigned long addr = 0; "); | |
1225 | obstack_printf (pool, "if (addr==0) addr = _stp_module_relocate (\"%s\",\"%s\",%#" PRIx64 "); ", | |
1226 | modname, secname, address); | |
1227 | obstack_printf (pool, "addr; })"); | |
1228 | } | |
e38d6504 | 1229 | else |
e664cf5b FCE |
1230 | { |
1231 | throw semantic_error ("cannot relocate user-space dso (?) address"); | |
1232 | #if 0 | |
1233 | // This would happen for a Dwfl_Module that's a user-level DSO. | |
1234 | obstack_printf (pool, " /* %s+%#" PRIx64 " */", | |
1235 | modname, address); | |
1236 | #endif | |
1237 | } | |
e38d6504 | 1238 | } |
e664cf5b FCE |
1239 | else |
1240 | obstack_printf (pool, "%#" PRIx64 "UL", address); // assume as constant | |
e38d6504 | 1241 | } |
7e1279ea | 1242 | |
4b1ad75e RM |
1243 | static void loc2c_emit_address (void *arg, struct obstack *pool, |
1244 | Dwarf_Addr address) | |
1245 | { | |
1246 | dwflpp *dwfl = (dwflpp *) arg; | |
e38d6504 | 1247 | dwfl->emit_address (pool, address); |
4b1ad75e RM |
1248 | } |
1249 | ||
82e72903 DS |
1250 | void print_locals(Dwarf_Die *die, ostream &o) |
1251 | { | |
1252 | // Try to get the first child of die. | |
1253 | bool local_found = false; | |
1254 | Dwarf_Die child; | |
1255 | if (dwarf_child (die, &child) == 0) | |
1256 | { | |
1257 | do | |
1258 | { | |
1259 | // Output each sibling's name (that is a variable or | |
1260 | // parameter) to 'o'. | |
1261 | switch (dwarf_tag (&child)) | |
1262 | { | |
1263 | case DW_TAG_variable: | |
1264 | case DW_TAG_formal_parameter: | |
1265 | o << " " << dwarf_diename (&child); | |
1266 | local_found = true; | |
1267 | break; | |
1268 | default: | |
1269 | break; | |
1270 | } | |
1271 | } | |
1272 | while (dwarf_siblingof (&child, &child) == 0); | |
1273 | } | |
1274 | ||
1275 | if (! local_found) | |
1276 | o << " (none found)"; | |
1277 | } | |
1278 | ||
e57b735a GH |
1279 | Dwarf_Attribute * |
1280 | find_variable_and_frame_base (Dwarf_Die *scope_die, | |
20e4a32c | 1281 | Dwarf_Addr pc, |
91eefb1c | 1282 | string const & local, |
e57b735a GH |
1283 | Dwarf_Die *vardie, |
1284 | Dwarf_Attribute *fb_attr_mem) | |
77de5e9e | 1285 | { |
77de5e9e | 1286 | Dwarf_Die *scopes; |
bcc12710 | 1287 | int nscopes = 0; |
e57b735a GH |
1288 | Dwarf_Attribute *fb_attr = NULL; |
1289 | ||
1290 | assert (cu); | |
bcc12710 FCE |
1291 | |
1292 | if (scope_die) | |
1293 | nscopes = dwarf_getscopes_die (scope_die, &scopes); | |
1294 | else | |
1295 | nscopes = dwarf_getscopes (cu, pc, &scopes); | |
77de5e9e | 1296 | |
77de5e9e GH |
1297 | if (nscopes == 0) |
1298 | { | |
7a053d3b | 1299 | throw semantic_error ("unable to find any scopes containing " |
59ff2773 | 1300 | + lex_cast_hex<string>(pc) |
77de5e9e GH |
1301 | + " while searching for local '" + local + "'"); |
1302 | } | |
7a053d3b | 1303 | |
77de5e9e | 1304 | int declaring_scope = dwarf_getscopevar (scopes, nscopes, |
7a053d3b RM |
1305 | local.c_str(), |
1306 | 0, NULL, 0, 0, | |
e57b735a | 1307 | vardie); |
77de5e9e GH |
1308 | if (declaring_scope < 0) |
1309 | { | |
82e72903 DS |
1310 | stringstream alternatives; |
1311 | print_locals (scopes, alternatives); | |
77de5e9e | 1312 | throw semantic_error ("unable to find local '" + local + "'" |
82e72903 DS |
1313 | + " near pc " + lex_cast_hex<string>(pc) |
1314 | + " (alternatives:" + alternatives.str () | |
1315 | + ")"); | |
77de5e9e | 1316 | } |
7a053d3b | 1317 | |
77de5e9e GH |
1318 | for (int inner = 0; inner < nscopes; ++inner) |
1319 | { | |
1320 | switch (dwarf_tag (&scopes[inner])) | |
1321 | { | |
1322 | default: | |
1323 | continue; | |
1324 | case DW_TAG_subprogram: | |
1325 | case DW_TAG_entry_point: | |
1326 | case DW_TAG_inlined_subroutine: /* XXX */ | |
1327 | if (inner >= declaring_scope) | |
1328 | fb_attr = dwarf_attr_integrate (&scopes[inner], | |
1329 | DW_AT_frame_base, | |
e57b735a | 1330 | fb_attr_mem); |
77de5e9e GH |
1331 | break; |
1332 | } | |
1333 | } | |
e57b735a GH |
1334 | return fb_attr; |
1335 | } | |
77de5e9e | 1336 | |
77de5e9e | 1337 | |
d1531387 RM |
1338 | struct location * |
1339 | translate_location(struct obstack *pool, | |
1340 | Dwarf_Attribute *attr, Dwarf_Addr pc, | |
1341 | Dwarf_Attribute *fb_attr, | |
1342 | struct location **tail) | |
1343 | { | |
1344 | Dwarf_Op *expr; | |
1345 | size_t len; | |
1346 | ||
1347 | switch (dwarf_getlocation_addr (attr, pc - module_bias, &expr, &len, 1)) | |
1348 | { | |
1349 | case 1: /* Should always happen. */ | |
1350 | if (len > 0) | |
1351 | break; | |
1352 | /* Fall through. */ | |
1353 | ||
1354 | case 0: /* Shouldn't happen. */ | |
1355 | throw semantic_error ("not accessible at this address"); | |
1356 | ||
1357 | default: /* Shouldn't happen. */ | |
1358 | case -1: | |
1359 | throw semantic_error (string ("dwarf_getlocation_addr failed") + | |
1360 | string (dwarf_errmsg (-1))); | |
1361 | } | |
1362 | ||
1363 | return c_translate_location (pool, &loc2c_error, this, | |
1364 | &loc2c_emit_address, | |
1365 | 1, module_bias, | |
1366 | pc, expr, len, tail, fb_attr); | |
1367 | } | |
1368 | ||
82e72903 DS |
1369 | void |
1370 | print_members(Dwarf_Die *vardie, ostream &o) | |
1371 | { | |
1372 | const int typetag = dwarf_tag (vardie); | |
1373 | ||
1374 | if (typetag != DW_TAG_structure_type && typetag != DW_TAG_union_type) | |
1375 | { | |
1376 | o << " Error: " | |
1377 | << (dwarf_diename_integrate (vardie) ?: "<anonymous>") | |
1378 | << " isn't a struct/union"; | |
1379 | return; | |
1380 | } | |
1381 | ||
1382 | // Try to get the first child of vardie. | |
1383 | Dwarf_Die die_mem; | |
1384 | Dwarf_Die *die = &die_mem; | |
1385 | switch (dwarf_child (vardie, die)) | |
1386 | { | |
1387 | case 1: // No children. | |
1388 | o << ((typetag == DW_TAG_union_type) ? " union " : " struct ") | |
1389 | << (dwarf_diename_integrate (die) ?: "<anonymous>") | |
1390 | << " is empty"; | |
1391 | break; | |
1392 | ||
1393 | case -1: // Error. | |
1394 | default: // Shouldn't happen. | |
1395 | o << ((typetag == DW_TAG_union_type) ? " union " : " struct ") | |
1396 | << (dwarf_diename_integrate (die) ?: "<anonymous>") | |
1397 | << ": " << dwarf_errmsg (-1); | |
1398 | break; | |
1399 | ||
1400 | case 0: // Success. | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | // Output each sibling's name to 'o'. | |
1405 | while (dwarf_tag (die) == DW_TAG_member) | |
1406 | { | |
1407 | const char *member = (dwarf_diename_integrate (die) ?: "<anonymous>"); | |
1408 | ||
1409 | o << " " << member; | |
1410 | ||
1411 | if (dwarf_siblingof (die, &die_mem) != 0) | |
1412 | break; | |
1413 | } | |
1414 | } | |
1415 | ||
e57b735a GH |
1416 | Dwarf_Die * |
1417 | translate_components(struct obstack *pool, | |
20e4a32c RM |
1418 | struct location **tail, |
1419 | Dwarf_Addr pc, | |
e57b735a GH |
1420 | vector<pair<target_symbol::component_type, |
1421 | std::string> > const & components, | |
1422 | Dwarf_Die *vardie, | |
1423 | Dwarf_Die *die_mem, | |
1424 | Dwarf_Attribute *attr_mem) | |
1425 | { | |
1426 | Dwarf_Die *die = vardie; | |
82e72903 | 1427 | Dwarf_Die struct_die; |
d9b516ca RM |
1428 | unsigned i = 0; |
1429 | while (i < components.size()) | |
1430 | { | |
e57b735a | 1431 | die = dwarf_formref_die (attr_mem, die_mem); |
d9b516ca RM |
1432 | const int typetag = dwarf_tag (die); |
1433 | switch (typetag) | |
1434 | { | |
1435 | case DW_TAG_typedef: | |
fdfbe4f7 GH |
1436 | case DW_TAG_const_type: |
1437 | case DW_TAG_volatile_type: | |
d9b516ca RM |
1438 | /* Just iterate on the referent type. */ |
1439 | break; | |
91eefb1c | 1440 | |
d9b516ca RM |
1441 | case DW_TAG_pointer_type: |
1442 | if (components[i].first == target_symbol::comp_literal_array_index) | |
2302c47e FCE |
1443 | throw semantic_error ("cannot index pointer"); |
1444 | // XXX: of course, we should support this the same way C does, | |
1445 | // by explicit pointer arithmetic etc. | |
91eefb1c | 1446 | |
e57b735a | 1447 | c_translate_pointer (pool, 1, module_bias, die, tail); |
d9b516ca | 1448 | break; |
91eefb1c | 1449 | |
d9b516ca RM |
1450 | case DW_TAG_array_type: |
1451 | if (components[i].first == target_symbol::comp_literal_array_index) | |
1452 | { | |
e57b735a | 1453 | c_translate_array (pool, 1, module_bias, die, tail, |
d9b516ca RM |
1454 | NULL, lex_cast<Dwarf_Word>(components[i].second)); |
1455 | ++i; | |
1456 | } | |
1457 | else | |
1458 | throw semantic_error("bad field '" | |
1459 | + components[i].second | |
1460 | + "' for array type"); | |
1461 | break; | |
91eefb1c | 1462 | |
d9b516ca RM |
1463 | case DW_TAG_structure_type: |
1464 | case DW_TAG_union_type: | |
82e72903 | 1465 | struct_die = *die; |
e57b735a | 1466 | switch (dwarf_child (die, die_mem)) |
d9b516ca RM |
1467 | { |
1468 | case 1: /* No children. */ | |
1469 | throw semantic_error ("empty struct " | |
1470 | + string (dwarf_diename_integrate (die) ?: "<anonymous>")); | |
1471 | break; | |
1472 | case -1: /* Error. */ | |
1473 | default: /* Shouldn't happen */ | |
1474 | throw semantic_error (string (typetag == DW_TAG_union_type ? "union" : "struct") | |
1475 | + string (dwarf_diename_integrate (die) ?: "<anonymous>") | |
1476 | + string (dwarf_errmsg (-1))); | |
1477 | break; | |
1478 | ||
1479 | case 0: | |
1480 | break; | |
1481 | } | |
1482 | ||
1483 | while (dwarf_tag (die) != DW_TAG_member | |
1484 | || ({ const char *member = dwarf_diename_integrate (die); | |
1485 | member == NULL || string(member) != components[i].second; })) | |
e57b735a | 1486 | if (dwarf_siblingof (die, die_mem) != 0) |
82e72903 DS |
1487 | { |
1488 | stringstream alternatives; | |
1489 | print_members (&struct_die, alternatives); | |
1490 | throw semantic_error ("field '" + components[i].second | |
1491 | + "' not found (alternatives:" | |
1492 | + alternatives.str () + ")"); | |
1493 | } | |
d9b516ca RM |
1494 | |
1495 | if (dwarf_attr_integrate (die, DW_AT_data_member_location, | |
e57b735a | 1496 | attr_mem) == NULL) |
d9b516ca RM |
1497 | { |
1498 | /* Union members don't usually have a location, | |
1499 | but just use the containing union's location. */ | |
1500 | if (typetag != DW_TAG_union_type) | |
9f36b77f | 1501 | throw semantic_error ("no location for field '" |
d9b516ca | 1502 | + components[i].second |
9f36b77f | 1503 | + "' :" + string(dwarf_errmsg (-1))); |
d9b516ca RM |
1504 | } |
1505 | else | |
d1531387 | 1506 | translate_location (pool, attr_mem, pc, NULL, tail); |
d9b516ca RM |
1507 | ++i; |
1508 | break; | |
1509 | ||
1510 | case DW_TAG_base_type: | |
9f36b77f | 1511 | throw semantic_error ("field '" |
d9b516ca | 1512 | + components[i].second |
9f36b77f | 1513 | + "' vs. base type " |
d9b516ca RM |
1514 | + string(dwarf_diename_integrate (die) ?: "<anonymous type>")); |
1515 | break; | |
1516 | case -1: | |
1517 | throw semantic_error ("cannot find type: " + string(dwarf_errmsg (-1))); | |
1518 | break; | |
1519 | ||
1520 | default: | |
1521 | throw semantic_error (string(dwarf_diename_integrate (die) ?: "<anonymous type>") | |
1522 | + ": unexpected type tag " | |
1523 | + lex_cast<string>(dwarf_tag (die))); | |
1524 | break; | |
1525 | } | |
1526 | ||
1527 | /* Now iterate on the type in DIE's attribute. */ | |
e57b735a | 1528 | if (dwarf_attr_integrate (die, DW_AT_type, attr_mem) == NULL) |
d9b516ca RM |
1529 | throw semantic_error ("cannot get type of field: " + string(dwarf_errmsg (-1))); |
1530 | } | |
e57b735a GH |
1531 | return die; |
1532 | } | |
91eefb1c | 1533 | |
d9b516ca | 1534 | |
e57b735a GH |
1535 | Dwarf_Die * |
1536 | resolve_unqualified_inner_typedie (Dwarf_Die *typedie_mem, | |
1537 | Dwarf_Attribute *attr_mem) | |
1538 | { | |
1539 | ; | |
d9b516ca | 1540 | Dwarf_Die *typedie; |
e57b735a | 1541 | int typetag = 0; |
d9b516ca | 1542 | while (1) |
20e4a32c | 1543 | { |
e57b735a | 1544 | typedie = dwarf_formref_die (attr_mem, typedie_mem); |
d9b516ca | 1545 | if (typedie == NULL) |
e57b735a | 1546 | throw semantic_error ("cannot get type: " + string(dwarf_errmsg (-1))); |
d9b516ca | 1547 | typetag = dwarf_tag (typedie); |
20e4a32c | 1548 | if (typetag != DW_TAG_typedef && |
fdfbe4f7 GH |
1549 | typetag != DW_TAG_const_type && |
1550 | typetag != DW_TAG_volatile_type) | |
91eefb1c | 1551 | break; |
e57b735a GH |
1552 | if (dwarf_attr_integrate (typedie, DW_AT_type, attr_mem) == NULL) |
1553 | throw semantic_error ("cannot get type of pointee: " + string(dwarf_errmsg (-1))); | |
d9b516ca | 1554 | } |
e57b735a GH |
1555 | return typedie; |
1556 | } | |
91eefb1c | 1557 | |
91eefb1c | 1558 | |
20e4a32c | 1559 | void |
e57b735a GH |
1560 | translate_final_fetch_or_store (struct obstack *pool, |
1561 | struct location **tail, | |
1562 | Dwarf_Addr module_bias, | |
1563 | Dwarf_Die *die, | |
1564 | Dwarf_Attribute *attr_mem, | |
1565 | bool lvalue, | |
78f6bba6 FCE |
1566 | string & /*prelude*/, |
1567 | string & /*postlude*/, | |
e57b735a GH |
1568 | exp_type & ty) |
1569 | { | |
1570 | /* First boil away any qualifiers associated with the type DIE of | |
1571 | the final location to be accessed. */ | |
fdfbe4f7 | 1572 | |
e57b735a GH |
1573 | Dwarf_Die typedie_mem; |
1574 | Dwarf_Die *typedie; | |
1575 | int typetag; | |
1576 | ||
1577 | typedie = resolve_unqualified_inner_typedie (&typedie_mem, attr_mem); | |
1578 | typetag = dwarf_tag (typedie); | |
1579 | ||
1580 | /* Then switch behavior depending on the type of fetch/store we | |
1581 | want, and the type and pointer-ness of the final location. */ | |
20e4a32c | 1582 | |
fdfbe4f7 GH |
1583 | switch (typetag) |
1584 | { | |
fdfbe4f7 | 1585 | default: |
66d284f4 FCE |
1586 | throw semantic_error ("unsupported type tag " |
1587 | + lex_cast<string>(typetag)); | |
fdfbe4f7 | 1588 | break; |
66d284f4 | 1589 | |
e7a012f0 | 1590 | case DW_TAG_enumeration_type: |
fdfbe4f7 GH |
1591 | case DW_TAG_base_type: |
1592 | ty = pe_long; | |
e57b735a GH |
1593 | if (lvalue) |
1594 | c_translate_store (pool, 1, module_bias, die, typedie, tail, | |
1595 | "THIS->value"); | |
20e4a32c | 1596 | else |
e57b735a GH |
1597 | c_translate_fetch (pool, 1, module_bias, die, typedie, tail, |
1598 | "THIS->__retvalue"); | |
fdfbe4f7 GH |
1599 | break; |
1600 | ||
1601 | case DW_TAG_array_type: | |
1602 | case DW_TAG_pointer_type: | |
e57b735a GH |
1603 | |
1604 | if (lvalue) | |
1605 | throw semantic_error ("cannot store into target pointer value"); | |
1606 | ||
fdfbe4f7 GH |
1607 | { |
1608 | Dwarf_Die pointee_typedie_mem; | |
1609 | Dwarf_Die *pointee_typedie; | |
1610 | Dwarf_Word pointee_encoding; | |
246b383e | 1611 | Dwarf_Word pointee_byte_size = 0; |
fdfbe4f7 | 1612 | |
e57b735a GH |
1613 | pointee_typedie = resolve_unqualified_inner_typedie (&pointee_typedie_mem, attr_mem); |
1614 | ||
1615 | if (dwarf_attr_integrate (pointee_typedie, DW_AT_byte_size, attr_mem)) | |
1616 | dwarf_formudata (attr_mem, &pointee_byte_size); | |
20e4a32c RM |
1617 | |
1618 | dwarf_formudata (dwarf_attr_integrate (pointee_typedie, DW_AT_encoding, attr_mem), | |
fdfbe4f7 GH |
1619 | &pointee_encoding); |
1620 | ||
f9eba66e FCE |
1621 | // We have the pointer: cast it to an integral type via &(*(...)) |
1622 | ||
1623 | // NB: per bug #1187, at one point char*-like types were | |
1624 | // automagically converted here to systemtap string values. | |
1625 | // For several reasons, this was taken back out, leaving | |
1626 | // pointer-to-string "conversion" (copying) to tapset functions. | |
1627 | ||
1628 | ty = pe_long; | |
1629 | if (typetag == DW_TAG_array_type) | |
e57b735a | 1630 | c_translate_array (pool, 1, module_bias, typedie, tail, NULL, 0); |
fdfbe4f7 | 1631 | else |
e57b735a | 1632 | c_translate_pointer (pool, 1, module_bias, typedie, tail); |
20e4a32c | 1633 | c_translate_addressof (pool, 1, module_bias, NULL, pointee_typedie, tail, |
f9eba66e | 1634 | "THIS->__retvalue"); |
fdfbe4f7 | 1635 | } |
20e4a32c | 1636 | break; |
fdfbe4f7 | 1637 | } |
20e4a32c | 1638 | } |
e57b735a | 1639 | |
e19fda4e DS |
1640 | string |
1641 | express_as_string (string prelude, | |
1642 | string postlude, | |
1643 | struct location *head) | |
1644 | { | |
1645 | size_t bufsz = 1024; | |
1646 | char *buf = static_cast<char*>(malloc(bufsz)); | |
1647 | assert(buf); | |
1648 | ||
1649 | FILE *memstream = open_memstream (&buf, &bufsz); | |
1650 | assert(memstream); | |
1651 | ||
1652 | fprintf(memstream, "{\n"); | |
1653 | fprintf(memstream, prelude.c_str()); | |
1654 | bool deref = c_emit_location (memstream, head, 1); | |
1655 | fprintf(memstream, postlude.c_str()); | |
1656 | fprintf(memstream, " goto out;\n"); | |
1657 | ||
1658 | // dummy use of deref_fault label, to disable warning if deref() not used | |
1659 | fprintf(memstream, "if (0) goto deref_fault;\n"); | |
1660 | ||
1661 | // XXX: deref flag not reliable; emit fault label unconditionally | |
1662 | // XXX: print the faulting address, like the user_string/kernel_string | |
1663 | // tapset functions do | |
78f6bba6 | 1664 | (void) deref; |
e19fda4e DS |
1665 | fprintf(memstream, |
1666 | "deref_fault:\n" | |
1667 | " c->last_error = \"pointer dereference fault\";\n" | |
1668 | " goto out;\n"); | |
1669 | fprintf(memstream, "}\n"); | |
1670 | ||
1671 | fclose (memstream); | |
1672 | string result(buf); | |
1673 | free (buf); | |
1674 | return result; | |
1675 | } | |
e57b735a | 1676 | |
20e4a32c | 1677 | string |
e57b735a | 1678 | literal_stmt_for_local (Dwarf_Die *scope_die, |
20e4a32c | 1679 | Dwarf_Addr pc, |
e57b735a GH |
1680 | string const & local, |
1681 | vector<pair<target_symbol::component_type, | |
1682 | std::string> > const & components, | |
1683 | bool lvalue, | |
1684 | exp_type & ty) | |
1685 | { | |
1686 | Dwarf_Die vardie; | |
1687 | Dwarf_Attribute fb_attr_mem, *fb_attr = NULL; | |
1688 | ||
20e4a32c | 1689 | fb_attr = find_variable_and_frame_base (scope_die, pc, local, |
e57b735a GH |
1690 | &vardie, &fb_attr_mem); |
1691 | ||
b0ee93c4 | 1692 | if (sess.verbose>2) |
e57b735a GH |
1693 | clog << "finding location for local '" << local |
1694 | << "' near address " << hex << pc | |
1695 | << ", module bias " << module_bias << dec | |
db22e55f | 1696 | << "\n"; |
e57b735a GH |
1697 | |
1698 | Dwarf_Attribute attr_mem; | |
1699 | if (dwarf_attr_integrate (&vardie, DW_AT_location, &attr_mem) == NULL) | |
1700 | { | |
1701 | throw semantic_error("failed to retrieve location " | |
20e4a32c RM |
1702 | "attribute for local '" + local |
1703 | + "' (dieoffset: " | |
1704 | + lex_cast_hex<string>(dwarf_dieoffset (&vardie)) | |
e57b735a GH |
1705 | + ")"); |
1706 | } | |
1707 | ||
1708 | #define obstack_chunk_alloc malloc | |
1709 | #define obstack_chunk_free free | |
1710 | ||
1711 | struct obstack pool; | |
1712 | obstack_init (&pool); | |
1713 | struct location *tail = NULL; | |
1714 | ||
1715 | /* Given $foo->bar->baz[NN], translate the location of foo. */ | |
1716 | ||
d1531387 RM |
1717 | struct location *head = translate_location (&pool, |
1718 | &attr_mem, pc, fb_attr, &tail); | |
e57b735a GH |
1719 | |
1720 | if (dwarf_attr_integrate (&vardie, DW_AT_type, &attr_mem) == NULL) | |
1721 | throw semantic_error("failed to retrieve type " | |
1722 | "attribute for local '" + local + "'"); | |
1723 | ||
1724 | ||
1725 | /* Translate the ->bar->baz[NN] parts. */ | |
1726 | ||
1727 | Dwarf_Die die_mem, *die = NULL; | |
20e4a32c | 1728 | die = translate_components (&pool, &tail, pc, components, |
e57b735a GH |
1729 | &vardie, &die_mem, &attr_mem); |
1730 | ||
20e4a32c RM |
1731 | /* Translate the assignment part, either |
1732 | x = $foo->bar->baz[NN] | |
1733 | or | |
e57b735a GH |
1734 | $foo->bar->baz[NN] = x |
1735 | */ | |
1736 | ||
1737 | string prelude, postlude; | |
20e4a32c | 1738 | translate_final_fetch_or_store (&pool, &tail, module_bias, |
e57b735a GH |
1739 | die, &attr_mem, lvalue, |
1740 | prelude, postlude, ty); | |
1741 | ||
1742 | /* Write the translation to a string. */ | |
e19fda4e DS |
1743 | return express_as_string(prelude, postlude, head); |
1744 | } | |
20e4a32c | 1745 | |
20e4a32c | 1746 | |
e19fda4e DS |
1747 | string |
1748 | literal_stmt_for_return (Dwarf_Die *scope_die, | |
1749 | Dwarf_Addr pc, | |
1750 | vector<pair<target_symbol::component_type, | |
1751 | std::string> > const & components, | |
1752 | bool lvalue, | |
1753 | exp_type & ty) | |
1754 | { | |
1755 | if (sess.verbose>2) | |
1756 | clog << "literal_stmt_for_return: finding return value for " | |
1757 | << dwarf_diename (scope_die) | |
1758 | << "(" | |
1759 | << dwarf_diename (cu) | |
1760 | << ")\n"; | |
7a053d3b | 1761 | |
e19fda4e DS |
1762 | struct obstack pool; |
1763 | obstack_init (&pool); | |
1764 | struct location *tail = NULL; | |
7a053d3b | 1765 | |
e19fda4e DS |
1766 | /* Given $return->bar->baz[NN], translate the location of return. */ |
1767 | const Dwarf_Op *locops; | |
1768 | int nlocops = dwfl_module_return_value_location (module, scope_die, | |
1769 | &locops); | |
1770 | if (nlocops < 0) | |
1771 | { | |
1772 | throw semantic_error("failed to retrieve return value location"); | |
1773 | } | |
1774 | // the function has no return value (e.g. "void" in C) | |
1775 | else if (nlocops == 0) | |
1776 | { | |
1777 | throw semantic_error("function has no return value"); | |
1778 | } | |
a781f401 | 1779 | |
e19fda4e DS |
1780 | struct location *head = c_translate_location (&pool, &loc2c_error, this, |
1781 | &loc2c_emit_address, | |
1782 | 1, module_bias, | |
1783 | pc, locops, nlocops, | |
1784 | &tail, NULL); | |
7a053d3b | 1785 | |
e19fda4e | 1786 | /* Translate the ->bar->baz[NN] parts. */ |
7a053d3b | 1787 | |
e19fda4e DS |
1788 | Dwarf_Attribute attr_mem; |
1789 | Dwarf_Attribute *attr = dwarf_attr (scope_die, DW_AT_type, &attr_mem); | |
1790 | ||
1791 | Dwarf_Die vardie_mem; | |
1792 | Dwarf_Die *vardie = dwarf_formref_die (attr, &vardie_mem); | |
1793 | ||
1794 | Dwarf_Die die_mem, *die = NULL; | |
1795 | die = translate_components (&pool, &tail, pc, components, | |
1796 | vardie, &die_mem, &attr_mem); | |
1797 | ||
1798 | /* Translate the assignment part, either | |
1799 | x = $return->bar->baz[NN] | |
1800 | or | |
1801 | $return->bar->baz[NN] = x | |
1802 | */ | |
1803 | ||
1804 | string prelude, postlude; | |
1805 | translate_final_fetch_or_store (&pool, &tail, module_bias, | |
1806 | die, &attr_mem, lvalue, | |
1807 | prelude, postlude, ty); | |
1808 | ||
1809 | /* Write the translation to a string. */ | |
1810 | return express_as_string(prelude, postlude, head); | |
1811 | } | |
7a053d3b | 1812 | |
77de5e9e | 1813 | |
bd2b1e68 GH |
1814 | ~dwflpp() |
1815 | { | |
1816 | if (dwfl) | |
1817 | dwfl_end(dwfl); | |
1818 | } | |
1819 | }; | |
1820 | ||
20c6c071 | 1821 | |
7a053d3b | 1822 | enum |
bd2b1e68 | 1823 | function_spec_type |
7a053d3b | 1824 | { |
bd2b1e68 GH |
1825 | function_alone, |
1826 | function_and_file, | |
7a053d3b | 1827 | function_file_and_line |
bd2b1e68 GH |
1828 | }; |
1829 | ||
ec4373ff | 1830 | |
bd2b1e68 | 1831 | struct dwarf_builder; |
77de5e9e GH |
1832 | struct dwarf_query; |
1833 | ||
2930abc7 | 1834 | |
b20febf3 FCE |
1835 | // XXX: This class is a candidate for subclassing to separate |
1836 | // the relocation vs non-relocation variants. Likewise for | |
1837 | // kprobe vs kretprobe variants. | |
1838 | ||
1839 | struct dwarf_derived_probe: public derived_probe | |
b55bc428 | 1840 | { |
b20febf3 FCE |
1841 | dwarf_derived_probe (const string& function, |
1842 | const string& filename, | |
1843 | int line, | |
1844 | const string& module, | |
1845 | const string& section, | |
1846 | Dwarf_Addr dwfl_addr, | |
2930abc7 | 1847 | Dwarf_Addr addr, |
b20febf3 FCE |
1848 | dwarf_query & q, |
1849 | Dwarf_Die* scope_die); | |
20e4a32c | 1850 | |
b20febf3 FCE |
1851 | string module; |
1852 | string section; | |
1853 | Dwarf_Addr addr; | |
2930abc7 | 1854 | bool has_return; |
c9bad430 DS |
1855 | bool has_maxactive; |
1856 | long maxactive_val; | |
2930abc7 | 1857 | |
b20febf3 | 1858 | void join_group (systemtap_session& s); |
d9b516ca | 1859 | |
bd2b1e68 | 1860 | // Pattern registration helpers. |
7a053d3b | 1861 | static void register_relative_variants(match_node * root, |
bd2b1e68 | 1862 | dwarf_builder * dw); |
7a053d3b | 1863 | static void register_statement_variants(match_node * root, |
bd2b1e68 | 1864 | dwarf_builder * dw); |
fd6602a0 FCE |
1865 | static void register_function_variants(match_node * root, |
1866 | dwarf_builder * dw); | |
54efe513 GH |
1867 | static void register_inline_variants(match_node * root, |
1868 | dwarf_builder * dw); | |
7a053d3b | 1869 | static void register_function_and_statement_variants(match_node * root, |
bd2b1e68 | 1870 | dwarf_builder * dw); |
20c6c071 | 1871 | static void register_patterns(match_node * root); |
20c6c071 GH |
1872 | }; |
1873 | ||
dc38c0ae DS |
1874 | |
1875 | struct dwarf_derived_probe_group: public derived_probe_group | |
1876 | { | |
1877 | private: | |
b20febf3 FCE |
1878 | multimap<string,dwarf_derived_probe*> probes_by_module; |
1879 | typedef multimap<string,dwarf_derived_probe*>::iterator p_b_m_iterator; | |
dc38c0ae DS |
1880 | |
1881 | public: | |
b20febf3 FCE |
1882 | void enroll (dwarf_derived_probe* probe); |
1883 | void emit_module_decls (systemtap_session& s); | |
1884 | void emit_module_init (systemtap_session& s); | |
1885 | void emit_module_exit (systemtap_session& s); | |
dc38c0ae DS |
1886 | }; |
1887 | ||
1888 | ||
20c6c071 | 1889 | // Helper struct to thread through the dwfl callbacks. |
b20febf3 | 1890 | struct dwarf_query |
20c6c071 | 1891 | { |
5227f1ea GH |
1892 | dwarf_query(systemtap_session & sess, |
1893 | probe * base_probe, | |
20c6c071 GH |
1894 | probe_point * base_loc, |
1895 | dwflpp & dw, | |
1896 | map<string, literal *> const & params, | |
1897 | vector<derived_probe *> & results); | |
bd2b1e68 | 1898 | |
5227f1ea GH |
1899 | systemtap_session & sess; |
1900 | ||
bd2b1e68 | 1901 | // Parameter extractors. |
7a053d3b | 1902 | static bool has_null_param(map<string, literal *> const & params, |
bd2b1e68 | 1903 | string const & k); |
7a053d3b | 1904 | static bool get_string_param(map<string, literal *> const & params, |
bd2b1e68 | 1905 | string const & k, string & v); |
7a053d3b | 1906 | static bool get_number_param(map<string, literal *> const & params, |
bd2b1e68 | 1907 | string const & k, long & v); |
c239d28c GH |
1908 | static bool get_number_param(map<string, literal *> const & params, |
1909 | string const & k, Dwarf_Addr & v); | |
b55bc428 | 1910 | |
77de5e9e GH |
1911 | string pt_regs_member_for_regnum(uint8_t dwarf_regnum); |
1912 | ||
b20febf3 | 1913 | // Result vector |
20c6c071 | 1914 | vector<derived_probe *> & results; |
2930abc7 FCE |
1915 | void add_probe_point(string const & funcname, |
1916 | char const * filename, | |
1917 | int line, | |
1918 | Dwarf_Die *scope_die, | |
1919 | Dwarf_Addr addr); | |
20c6c071 | 1920 | |
0daad364 JS |
1921 | set<string> blacklisted_probes; |
1922 | set<string> blacklisted_return_probes; | |
1923 | void build_blacklist(); | |
1924 | ||
b20febf3 FCE |
1925 | bool blacklisted_p(const string& funcname, |
1926 | const string& filename, | |
36f9dd1d | 1927 | int line, |
b20febf3 FCE |
1928 | const string& module, |
1929 | const string& section, | |
36f9dd1d FCE |
1930 | Dwarf_Addr addr); |
1931 | ||
2930abc7 | 1932 | // Extracted parameters. |
20c6c071 GH |
1933 | bool has_kernel; |
1934 | bool has_process; | |
1935 | bool has_module; | |
7a053d3b RM |
1936 | string process_val; |
1937 | string module_val; | |
1938 | string function_val; | |
20c6c071 | 1939 | |
54efe513 | 1940 | bool has_inline_str; |
20c6c071 GH |
1941 | bool has_function_str; |
1942 | bool has_statement_str; | |
54efe513 | 1943 | bool has_inline_num; |
20c6c071 GH |
1944 | bool has_function_num; |
1945 | bool has_statement_num; | |
7a053d3b RM |
1946 | string statement_str_val; |
1947 | string function_str_val; | |
54efe513 | 1948 | string inline_str_val; |
c239d28c GH |
1949 | Dwarf_Addr statement_num_val; |
1950 | Dwarf_Addr function_num_val; | |
54efe513 | 1951 | Dwarf_Addr inline_num_val; |
20c6c071 GH |
1952 | |
1953 | bool has_callees; | |
7a053d3b | 1954 | long callee_val; |
20c6c071 GH |
1955 | |
1956 | bool has_return; | |
1957 | ||
c9bad430 DS |
1958 | bool has_maxactive; |
1959 | long maxactive_val; | |
1960 | ||
20c6c071 GH |
1961 | bool has_label; |
1962 | string label_val; | |
1963 | ||
1964 | bool has_relative; | |
1965 | long relative_val; | |
1966 | ||
1967 | function_spec_type parse_function_spec(string & spec); | |
1968 | function_spec_type spec_type; | |
1969 | string function; | |
1970 | string file; | |
1971 | int line; | |
1972 | ||
7e1279ea FCE |
1973 | set<char const *> filtered_srcfiles; |
1974 | ||
1975 | // Map official entrypc -> func_info object | |
1976 | map<Dwarf_Addr, inline_instance_info> filtered_inlines; | |
1977 | map<Dwarf_Addr, func_info> filtered_functions; | |
1978 | bool choose_next_line; | |
1979 | Dwarf_Addr entrypc_for_next_line; | |
1980 | ||
20c6c071 GH |
1981 | probe * base_probe; |
1982 | probe_point * base_loc; | |
1983 | dwflpp & dw; | |
b55bc428 FCE |
1984 | }; |
1985 | ||
98afd80e FCE |
1986 | |
1987 | struct dwarf_builder: public derived_probe_builder | |
b55bc428 | 1988 | { |
e38d6504 RM |
1989 | dwflpp *kern_dw; |
1990 | dwflpp *user_dw; | |
1991 | dwarf_builder() | |
1992 | : kern_dw(NULL), user_dw(NULL) | |
c8959a29 | 1993 | {} |
aa30ccd3 FCE |
1994 | |
1995 | void build_no_more (systemtap_session &s) | |
1996 | { | |
1997 | if (kern_dw) | |
1998 | { | |
1999 | if (s.verbose > 3) | |
2000 | clog << "dwarf_builder releasing dwflpp" << endl; | |
2001 | delete kern_dw; | |
2002 | kern_dw = 0; | |
2003 | } | |
2004 | } | |
2005 | ||
e38d6504 RM |
2006 | ~dwarf_builder() |
2007 | { | |
2008 | if (kern_dw) | |
c8959a29 | 2009 | delete kern_dw; |
e38d6504 | 2010 | if (user_dw) |
c8959a29 GH |
2011 | delete user_dw; |
2012 | } | |
aa30ccd3 | 2013 | |
5227f1ea | 2014 | virtual void build(systemtap_session & sess, |
7a053d3b | 2015 | probe * base, |
20c6c071 GH |
2016 | probe_point * location, |
2017 | std::map<std::string, literal *> const & parameters, | |
20c6c071 | 2018 | vector<derived_probe *> & finished_results); |
b55bc428 FCE |
2019 | }; |
2020 | ||
7a053d3b RM |
2021 | bool |
2022 | dwarf_query::has_null_param(map<string, literal *> const & params, | |
20c6c071 | 2023 | string const & k) |
bd2b1e68 GH |
2024 | { |
2025 | map<string, literal *>::const_iterator i = params.find(k); | |
2026 | if (i != params.end() && i->second == NULL) | |
2027 | return true; | |
2028 | return false; | |
2029 | } | |
2030 | ||
7a053d3b RM |
2031 | bool |
2032 | dwarf_query::get_string_param(map<string, literal *> const & params, | |
20c6c071 | 2033 | string const & k, string & v) |
bd2b1e68 | 2034 | { |
98afd80e | 2035 | return derived_probe_builder::get_param (params, k, v); |
bd2b1e68 GH |
2036 | } |
2037 | ||
7a053d3b RM |
2038 | bool |
2039 | dwarf_query::get_number_param(map<string, literal *> const & params, | |
20c6c071 | 2040 | string const & k, long & v) |
bd2b1e68 | 2041 | { |
98afd80e FCE |
2042 | int64_t value; |
2043 | bool present = derived_probe_builder::get_param (params, k, value); | |
2044 | v = (long) value; | |
2045 | return present; | |
bd2b1e68 GH |
2046 | } |
2047 | ||
c239d28c GH |
2048 | bool |
2049 | dwarf_query::get_number_param(map<string, literal *> const & params, | |
2050 | string const & k, Dwarf_Addr & v) | |
2051 | { | |
98afd80e FCE |
2052 | int64_t value; |
2053 | bool present = derived_probe_builder::get_param (params, k, value); | |
2054 | v = (Dwarf_Addr) value; | |
2055 | return present; | |
c239d28c GH |
2056 | } |
2057 | ||
77de5e9e | 2058 | |
5227f1ea GH |
2059 | dwarf_query::dwarf_query(systemtap_session & sess, |
2060 | probe * base_probe, | |
20c6c071 GH |
2061 | probe_point * base_loc, |
2062 | dwflpp & dw, | |
2063 | map<string, literal *> const & params, | |
2064 | vector<derived_probe *> & results) | |
5227f1ea GH |
2065 | : sess(sess), |
2066 | results(results), | |
7a053d3b | 2067 | base_probe(base_probe), |
20c6c071 GH |
2068 | base_loc(base_loc), |
2069 | dw(dw) | |
bd2b1e68 | 2070 | { |
20c6c071 | 2071 | |
bd2b1e68 GH |
2072 | // Reduce the query to more reasonable semantic values (booleans, |
2073 | // extracted strings, numbers, etc). | |
2074 | ||
2075 | has_kernel = has_null_param(params, TOK_KERNEL); | |
2076 | has_module = get_string_param(params, TOK_MODULE, module_val); | |
2077 | has_process = get_string_param(params, TOK_PROCESS, process_val); | |
2078 | ||
2079 | has_function_str = get_string_param(params, TOK_FUNCTION, function_str_val); | |
2080 | has_function_num = get_number_param(params, TOK_FUNCTION, function_num_val); | |
2081 | ||
54efe513 GH |
2082 | has_inline_str = get_string_param(params, TOK_INLINE, inline_str_val); |
2083 | has_inline_num = get_number_param(params, TOK_INLINE, inline_num_val); | |
2084 | ||
bd2b1e68 GH |
2085 | has_statement_str = get_string_param(params, TOK_STATEMENT, statement_str_val); |
2086 | has_statement_num = get_number_param(params, TOK_STATEMENT, statement_num_val); | |
2087 | ||
2088 | callee_val = 1; | |
7a053d3b | 2089 | has_callees = (has_null_param(params, TOK_CALLEES) || |
bd2b1e68 GH |
2090 | get_number_param(params, TOK_CALLEES, callee_val)); |
2091 | ||
2092 | has_return = has_null_param(params, TOK_RETURN); | |
c9bad430 | 2093 | has_maxactive = get_number_param(params, TOK_MAXACTIVE, maxactive_val); |
bd2b1e68 GH |
2094 | |
2095 | has_label = get_string_param(params, TOK_LABEL, label_val); | |
2096 | has_relative = get_number_param(params, TOK_RELATIVE, relative_val); | |
7a053d3b | 2097 | |
bd2b1e68 GH |
2098 | if (has_function_str) |
2099 | spec_type = parse_function_spec(function_str_val); | |
54efe513 GH |
2100 | else if (has_inline_str) |
2101 | spec_type = parse_function_spec(inline_str_val); | |
bd2b1e68 GH |
2102 | else if (has_statement_str) |
2103 | spec_type = parse_function_spec(statement_str_val); | |
0daad364 JS |
2104 | |
2105 | build_blacklist(); | |
2106 | } | |
2107 | ||
2108 | ||
2109 | void | |
2110 | dwarf_query::build_blacklist() | |
2111 | { | |
2112 | // FIXME: it would be nice if these blacklisted functions were pulled in | |
2113 | // dynamically, instead of being statically defined here. | |
2114 | ||
b20febf3 FCE |
2115 | // Most of these are marked __kprobes in newer kernels. We list |
2116 | // them here so the translator can block them on older kernels that | |
2117 | // don't have the __kprobes function decorator. This also allows | |
2118 | // detection of problems at translate- rather than run-time. | |
d390ce2f | 2119 | blacklisted_probes.insert("atomic_notifier_call_chain"); |
0daad364 JS |
2120 | blacklisted_probes.insert("default_do_nmi"); |
2121 | blacklisted_probes.insert("__die"); | |
2122 | blacklisted_probes.insert("die_nmi"); | |
2123 | blacklisted_probes.insert("do_debug"); | |
2124 | blacklisted_probes.insert("do_general_protection"); | |
2125 | blacklisted_probes.insert("do_int3"); | |
2126 | blacklisted_probes.insert("do_IRQ"); | |
2127 | blacklisted_probes.insert("do_page_fault"); | |
2128 | blacklisted_probes.insert("do_sparc64_fault"); | |
2129 | blacklisted_probes.insert("do_trap"); | |
2130 | blacklisted_probes.insert("dummy_nmi_callback"); | |
2131 | blacklisted_probes.insert("flush_icache_range"); | |
2132 | blacklisted_probes.insert("ia64_bad_break"); | |
2133 | blacklisted_probes.insert("ia64_do_page_fault"); | |
2134 | blacklisted_probes.insert("ia64_fault"); | |
2135 | blacklisted_probes.insert("io_check_error"); | |
2136 | blacklisted_probes.insert("mem_parity_error"); | |
2137 | blacklisted_probes.insert("nmi_watchdog_tick"); | |
2138 | blacklisted_probes.insert("notifier_call_chain"); | |
2139 | blacklisted_probes.insert("oops_begin"); | |
2140 | blacklisted_probes.insert("oops_end"); | |
2141 | blacklisted_probes.insert("program_check_exception"); | |
2142 | blacklisted_probes.insert("single_step_exception"); | |
2143 | blacklisted_probes.insert("sync_regs"); | |
2144 | blacklisted_probes.insert("unhandled_fault"); | |
2145 | blacklisted_probes.insert("unknown_nmi_error"); | |
2146 | ||
c931ec8a FCE |
2147 | blacklisted_probes.insert("_read_trylock"); |
2148 | blacklisted_probes.insert("_read_lock"); | |
2149 | blacklisted_probes.insert("_read_unlock"); | |
2150 | blacklisted_probes.insert("_write_trylock"); | |
2151 | blacklisted_probes.insert("_write_lock"); | |
2152 | blacklisted_probes.insert("_write_unlock"); | |
2153 | blacklisted_probes.insert("_spin_lock"); | |
2154 | blacklisted_probes.insert("_spin_lock_irqsave"); | |
2155 | blacklisted_probes.insert("_spin_trylock"); | |
2156 | blacklisted_probes.insert("_spin_unlock"); | |
2157 | blacklisted_probes.insert("_spin_unlock_irqrestore"); | |
2158 | ||
0daad364 JS |
2159 | // __switch_to is only disallowed on x86_64 |
2160 | if (sess.architecture == "x86_64") | |
2161 | blacklisted_probes.insert("__switch_to"); | |
2162 | ||
2163 | // These functions don't return, so return probes would never be recovered | |
2164 | blacklisted_return_probes.insert("do_exit"); | |
2165 | blacklisted_return_probes.insert("sys_exit"); | |
2166 | blacklisted_return_probes.insert("sys_exit_group"); | |
7a053d3b | 2167 | } |
bd2b1e68 GH |
2168 | |
2169 | ||
bd2b1e68 | 2170 | function_spec_type |
20c6c071 | 2171 | dwarf_query::parse_function_spec(string & spec) |
bd2b1e68 GH |
2172 | { |
2173 | string::const_iterator i = spec.begin(), e = spec.end(); | |
7a053d3b | 2174 | |
bd2b1e68 GH |
2175 | function.clear(); |
2176 | file.clear(); | |
2177 | line = 0; | |
2178 | ||
2179 | while (i != e && *i != '@') | |
2180 | { | |
2181 | if (*i == ':') | |
2182 | goto bad; | |
2183 | function += *i++; | |
2184 | } | |
2185 | ||
2186 | if (i == e) | |
2187 | { | |
b0ee93c4 | 2188 | if (sess.verbose>2) |
7a053d3b RM |
2189 | clog << "parsed '" << spec |
2190 | << "' -> func '" << function | |
db22e55f | 2191 | << "'\n"; |
bd2b1e68 GH |
2192 | return function_alone; |
2193 | } | |
2194 | ||
2195 | if (i++ == e) | |
2196 | goto bad; | |
2197 | ||
2198 | while (i != e && *i != ':') | |
2199 | file += *i++; | |
7a053d3b | 2200 | |
bd2b1e68 GH |
2201 | if (i == e) |
2202 | { | |
b0ee93c4 | 2203 | if (sess.verbose>2) |
7a053d3b RM |
2204 | clog << "parsed '" << spec |
2205 | << "' -> func '"<< function | |
2206 | << "', file '" << file | |
db22e55f | 2207 | << "'\n"; |
bd2b1e68 GH |
2208 | return function_and_file; |
2209 | } | |
2210 | ||
2211 | if (i++ == e) | |
2212 | goto bad; | |
2213 | ||
2214 | try | |
2215 | { | |
2216 | line = lex_cast<int>(string(i, e)); | |
b0ee93c4 | 2217 | if (sess.verbose>2) |
7a053d3b RM |
2218 | clog << "parsed '" << spec |
2219 | << "' -> func '"<< function | |
2220 | << "', file '" << file | |
db22e55f | 2221 | << "', line " << line << "\n"; |
bd2b1e68 GH |
2222 | return function_file_and_line; |
2223 | } | |
2224 | catch (runtime_error & exn) | |
2225 | { | |
2226 | goto bad; | |
2227 | } | |
2228 | ||
2229 | bad: | |
7a053d3b | 2230 | throw semantic_error("malformed specification '" + spec + "'", |
20c6c071 | 2231 | base_probe->tok); |
bd2b1e68 GH |
2232 | } |
2233 | ||
2234 | ||
b20febf3 FCE |
2235 | // Forward declaration. |
2236 | static int query_kernel_module (Dwfl_Module *, void **, const char *, | |
2237 | Dwarf_Addr, void *); | |
7e1279ea | 2238 | |
2930abc7 | 2239 | |
b20febf3 FCE |
2240 | static bool |
2241 | in_kprobes_function(systemtap_session& sess, Dwarf_Addr addr) | |
2930abc7 | 2242 | { |
b20febf3 FCE |
2243 | if (! sess.kprobes_text_initialized) |
2244 | { | |
2245 | // Only attempt kprobes_text_start/kprobes_text_end | |
2246 | // initialization once | |
2247 | sess.kprobes_text_initialized = true; | |
2930abc7 | 2248 | |
b20febf3 FCE |
2249 | dwflpp *kernel_dw = new dwflpp(sess); |
2250 | assert(kernel_dw); | |
2251 | kernel_dw->setup(true); | |
2930abc7 | 2252 | |
b20febf3 FCE |
2253 | Dwfl_Module *m = NULL; |
2254 | kernel_dw->iterate_over_modules(&query_kernel_module, &m); | |
2255 | assert(m); | |
2256 | kernel_dw->focus_on_module(m); | |
1d3a40b6 DS |
2257 | |
2258 | // Look through the symbol table for "__kprobes_text_{start,end}" | |
2259 | int syments = dwfl_module_getsymtab(kernel_dw->module); | |
2260 | assert(syments); | |
2261 | for (int i = 1; i < syments; ++i) | |
2262 | { | |
2263 | GElf_Sym sym; | |
2264 | const char *name = dwfl_module_getsym(kernel_dw->module, i, | |
2265 | &sym, NULL); | |
2266 | ||
2267 | // Look for a symbol that starts with "__kprobes_text_" | |
2268 | if (name != NULL | |
2269 | && strncmp(name, "__kprobes_text_", 15) == 0) | |
2270 | { | |
2271 | // Match either "__kprobes_text_start" or "__kprobes_text_end" | |
2272 | if (strcmp(name, "__kprobes_text_start") == 0) | |
2273 | sess.kprobes_text_start = sym.st_value; | |
2274 | else if (strcmp(name, "__kprobes_text_end") == 0) | |
2275 | sess.kprobes_text_end = sym.st_value; | |
2276 | ||
2277 | // If we've got both values, quit processing symbols. | |
2278 | if (sess.kprobes_text_start != 0 && sess.kprobes_text_end != 0) | |
2279 | i = syments; | |
2280 | } | |
2281 | } | |
2282 | ||
2283 | if (kernel_dw) | |
2284 | delete kernel_dw; | |
2285 | } | |
2286 | ||
2287 | if (sess.kprobes_text_start != 0 && sess.kprobes_text_end != 0) | |
2288 | { | |
2289 | // If the probe point address is anywhere in the __kprobes | |
2290 | // address range, we can't use this probe point. | |
2291 | if (addr >= sess.kprobes_text_start && addr < sess.kprobes_text_end) | |
2292 | return true; | |
2293 | } | |
2294 | return false; | |
2295 | } | |
2296 | ||
20e4a32c | 2297 | |
36f9dd1d | 2298 | bool |
b20febf3 FCE |
2299 | dwarf_query::blacklisted_p(const string& funcname, |
2300 | const string& filename, | |
78f6bba6 | 2301 | int, |
b20febf3 FCE |
2302 | const string& module, |
2303 | const string& section, | |
36f9dd1d FCE |
2304 | Dwarf_Addr addr) |
2305 | { | |
b20febf3 FCE |
2306 | if (section.substr(0, 6) == string(".init.") || |
2307 | section.substr(0, 6) == string(".exit.")) | |
703621ae | 2308 | { |
b20febf3 FCE |
2309 | if (sess.verbose>1) |
2310 | clog << " skipping - init/exit"; | |
2311 | return true; | |
703621ae FCE |
2312 | } |
2313 | ||
1d3a40b6 | 2314 | // Check for function marked '__kprobes'. |
b20febf3 | 2315 | if (module == TOK_KERNEL && in_kprobes_function(sess, addr)) |
1d3a40b6 DS |
2316 | { |
2317 | if (sess.verbose>1) | |
b20febf3 | 2318 | clog << " skipping - __kprobes"; |
1d3a40b6 DS |
2319 | return true; |
2320 | } | |
2321 | ||
36f9dd1d FCE |
2322 | // Check probe point against blacklist. XXX: This has to be |
2323 | // properly generalized, perhaps via a table populated from script | |
2324 | // files. A "noprobe kernel.function("...")" construct might do | |
2325 | // the trick. | |
0daad364 JS |
2326 | if (blacklisted_probes.count(funcname) > 0 || |
2327 | (has_return && blacklisted_return_probes.count(funcname) > 0) || | |
b20febf3 FCE |
2328 | filename == "kernel/kprobes.c" || |
2329 | 0 == fnmatch ("arch/*/kernel/kprobes.c", filename.c_str(), 0)) | |
36f9dd1d | 2330 | { |
b0ee93c4 | 2331 | if (sess.verbose>1) |
b20febf3 | 2332 | clog << " skipping - blacklisted"; |
36f9dd1d FCE |
2333 | return true; |
2334 | } | |
2335 | ||
2336 | // This probe point is not blacklisted. | |
2337 | return false; | |
2338 | } | |
2339 | ||
2340 | ||
b20febf3 | 2341 | |
36f9dd1d | 2342 | void |
b20febf3 FCE |
2343 | dwarf_query::add_probe_point(const string& funcname, |
2344 | const char* filename, | |
36f9dd1d | 2345 | int line, |
b20febf3 | 2346 | Dwarf_Die* scope_die, |
36f9dd1d FCE |
2347 | Dwarf_Addr addr) |
2348 | { | |
2349 | dwarf_derived_probe *probe = NULL; | |
b20febf3 FCE |
2350 | string reloc_section; // base section for relocation purposes |
2351 | Dwarf_Addr reloc_addr = addr; // relocated | |
2352 | string blacklist_section; // linking section for blacklist purposes | |
2353 | const string& module = dw.module_name; // "kernel" or other | |
36f9dd1d | 2354 | |
b20febf3 | 2355 | if (dwfl_module_relocations (dw.module) > 0) |
2930abc7 | 2356 | { |
b20febf3 FCE |
2357 | // This is arelocatable module; libdwfl already knows its |
2358 | // sections, so we can relativize addr. | |
2359 | int idx = dwfl_module_relocate_address (dw.module, &reloc_addr); | |
2360 | const char* r_s = dwfl_module_relocation_info (dw.module, idx, NULL); | |
2361 | if (r_s) | |
2362 | reloc_section = r_s; | |
2363 | blacklist_section = reloc_section; | |
2930abc7 FCE |
2364 | } |
2365 | else | |
2366 | { | |
b20febf3 FCE |
2367 | // This is not a relocatable module, so addr is all set. To |
2368 | // find the section name, must do this the long way - scan | |
2369 | // through elf section headers. | |
2370 | Dwarf_Addr baseaddr; | |
2371 | Elf* elf = dwfl_module_getelf (dw.module, & baseaddr); | |
2372 | Dwarf_Addr offset = addr - baseaddr; | |
2373 | // NB: this offset does not end up as reloc_addr, since the latter is | |
2374 | // only computed differently if load-time relocation is needed. For | |
2375 | // non-relocatable modules, this is not the case. | |
2376 | if (elf) | |
2377 | { | |
2378 | // Iterate through section headers to find which one | |
2379 | // contains the given offset. | |
2380 | Elf_Scn* scn = 0; | |
2381 | size_t shstrndx; | |
2382 | dw.dwfl_assert ("getshstrndx", elf_getshstrndx (elf, &shstrndx)); | |
2383 | while ((scn = elf_nextscn (elf, scn)) != NULL) | |
2384 | { | |
2385 | GElf_Shdr shdr_mem; | |
2386 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); | |
2387 | if (! shdr) continue; // XXX error? | |
2388 | ||
2389 | // check for address inclusion | |
2390 | GElf_Addr start = shdr->sh_addr; | |
2391 | GElf_Addr end = start + shdr->sh_size; | |
2392 | if (! (offset >= start && offset < end)) | |
2393 | continue; | |
20e4a32c | 2394 | |
b20febf3 FCE |
2395 | // check for section name |
2396 | blacklist_section = elf_strptr (elf, shstrndx, shdr->sh_name); | |
2397 | break; | |
2398 | } | |
2399 | } | |
20e4a32c | 2400 | |
b20febf3 | 2401 | reloc_section = ""; |
2930abc7 FCE |
2402 | } |
2403 | ||
7f9f3386 FCE |
2404 | if (sess.verbose > 1) |
2405 | { | |
b20febf3 FCE |
2406 | clog << "probe " << funcname << "@" << filename << ":" << line; |
2407 | if (string(module) == TOK_KERNEL) | |
2408 | clog << " kernel"; | |
2409 | else | |
2410 | clog << " module=" << module; | |
2411 | if (reloc_section != "") clog << " reloc=" << reloc_section; | |
2412 | if (blacklist_section != "") clog << " section=" << blacklist_section; | |
2413 | clog << " pc=0x" << hex << addr << dec; | |
7f9f3386 | 2414 | } |
b20febf3 FCE |
2415 | |
2416 | bool bad = blacklisted_p (funcname, filename, line, module, blacklist_section, addr); | |
2417 | if (sess.verbose > 1) | |
2418 | clog << endl; | |
7f9f3386 | 2419 | |
b20febf3 FCE |
2420 | if (! bad) |
2421 | { | |
2422 | probe = new dwarf_derived_probe(funcname, filename, line, | |
2423 | module, reloc_section, addr, reloc_addr, *this, scope_die); | |
2424 | results.push_back(probe); | |
2425 | } | |
2930abc7 FCE |
2426 | } |
2427 | ||
2428 | ||
2429 | ||
2430 | ||
7e1279ea FCE |
2431 | // The critical determining factor when interpreting a pattern |
2432 | // string is, perhaps surprisingly: "presence of a lineno". The | |
2433 | // presence of a lineno changes the search strategy completely. | |
2434 | // | |
2435 | // Compare the two cases: | |
2436 | // | |
2437 | // 1. {statement,function}(foo@file.c:lineno) | |
2438 | // - find the files matching file.c | |
2439 | // - in each file, find the functions matching foo | |
2440 | // - query the file for line records matching lineno | |
2441 | // - iterate over the line records, | |
20e4a32c RM |
2442 | // - and iterate over the functions, |
2443 | // - if(haspc(function.DIE, line.addr)) | |
7e1279ea FCE |
2444 | // - if looking for statements: probe(lineno.addr) |
2445 | // - if looking for functions: probe(function.{entrypc,return,etc.}) | |
20e4a32c | 2446 | // |
7e1279ea FCE |
2447 | // 2. {statement,function}(foo@file.c) |
2448 | // - find the files matching file.c | |
2449 | // - in each file, find the functions matching foo | |
2450 | // - probe(function.{entrypc,return,etc.}) | |
2451 | // | |
2452 | // Thus the first decision we make is based on the presence of a | |
2453 | // lineno, and we enter entirely different sets of callbacks | |
2454 | // depending on that decision. | |
2455 | ||
2456 | ||
bd2b1e68 | 2457 | static void |
4cd232e4 | 2458 | query_statement (string const & func, |
20e4a32c | 2459 | char const * file, |
4cd232e4 | 2460 | int line, |
bcc12710 | 2461 | Dwarf_Die *scope_die, |
20e4a32c | 2462 | Dwarf_Addr stmt_addr, |
4cd232e4 | 2463 | dwarf_query * q) |
bd2b1e68 | 2464 | { |
39bcd429 FCE |
2465 | try |
2466 | { | |
2467 | // XXX: implement | |
2468 | if (q->has_relative) | |
2469 | throw semantic_error("incomplete: do not know how to interpret .relative", | |
2470 | q->base_probe->tok); | |
d9b516ca | 2471 | |
a9b2f3a5 FCE |
2472 | q->add_probe_point(func, file ? file : "?", |
2473 | line, scope_die, stmt_addr); | |
39bcd429 FCE |
2474 | } |
2475 | catch (const semantic_error& e) | |
2476 | { | |
2477 | q->sess.print_error (e); | |
2478 | } | |
bd2b1e68 GH |
2479 | } |
2480 | ||
7e1279ea FCE |
2481 | static void |
2482 | query_inline_instance_info (Dwarf_Addr entrypc, | |
bcc12710 | 2483 | inline_instance_info & ii, |
7e1279ea FCE |
2484 | dwarf_query * q) |
2485 | { | |
b6581717 | 2486 | try |
7e1279ea | 2487 | { |
b6581717 GH |
2488 | if (q->has_return) |
2489 | { | |
2490 | throw semantic_error ("cannot probe .return of inline function '" + ii.name + "'"); | |
2491 | } | |
2492 | else | |
2493 | { | |
b0ee93c4 | 2494 | if (q->sess.verbose>2) |
20e4a32c RM |
2495 | clog << "querying entrypc " |
2496 | << hex << entrypc << dec | |
db22e55f | 2497 | << " of instance of inline '" << ii.name << "'\n"; |
20e4a32c | 2498 | query_statement (ii.name, ii.decl_file, ii.decl_line, |
b6581717 GH |
2499 | &ii.die, entrypc, q); |
2500 | } | |
7e1279ea | 2501 | } |
b6581717 | 2502 | catch (semantic_error &e) |
7e1279ea | 2503 | { |
b6581717 | 2504 | q->sess.print_error (e); |
7e1279ea FCE |
2505 | } |
2506 | } | |
2507 | ||
2508 | static void | |
2509 | query_func_info (Dwarf_Addr entrypc, | |
bcc12710 | 2510 | func_info & fi, |
7e1279ea FCE |
2511 | dwarf_query * q) |
2512 | { | |
b6581717 | 2513 | try |
7e1279ea | 2514 | { |
b6581717 GH |
2515 | if (q->has_return) |
2516 | { | |
2517 | // NB. dwarf_derived_probe::emit_registrations will emit a | |
2518 | // kretprobe based on the entrypc in this case. | |
20e4a32c | 2519 | query_statement (fi.name, fi.decl_file, fi.decl_line, |
b6581717 GH |
2520 | &fi.die, entrypc, q); |
2521 | } | |
2522 | else | |
2523 | { | |
44f75386 FCE |
2524 | if (q->sess.prologue_searching) |
2525 | { | |
2526 | if (fi.prologue_end == 0) | |
2527 | throw semantic_error("could not find prologue-end " | |
2528 | "for probed function '" + fi.name + "'"); | |
2529 | query_statement (fi.name, fi.decl_file, fi.decl_line, | |
2530 | &fi.die, fi.prologue_end, q); | |
2531 | } | |
2532 | else | |
2533 | { | |
2534 | query_statement (fi.name, fi.decl_file, fi.decl_line, | |
2535 | &fi.die, entrypc, q); | |
2536 | } | |
b6581717 | 2537 | } |
7e1279ea | 2538 | } |
b6581717 | 2539 | catch (semantic_error &e) |
7e1279ea | 2540 | { |
b6581717 | 2541 | q->sess.print_error (e); |
7e1279ea FCE |
2542 | } |
2543 | } | |
2544 | ||
2545 | ||
2546 | static void | |
2547 | query_srcfile_line (Dwarf_Line * line, void * arg) | |
2548 | { | |
2549 | dwarf_query * q = static_cast<dwarf_query *>(arg); | |
2550 | ||
2551 | Dwarf_Addr addr; | |
2552 | dwarf_lineaddr(line, &addr); | |
4cd232e4 | 2553 | |
7e1279ea FCE |
2554 | for (map<Dwarf_Addr, func_info>::iterator i = q->filtered_functions.begin(); |
2555 | i != q->filtered_functions.end(); ++i) | |
2556 | { | |
2557 | if (q->dw.die_has_pc (&(i->second.die), addr)) | |
2558 | { | |
b0ee93c4 | 2559 | if (q->sess.verbose>3) |
db22e55f | 2560 | clog << "function DIE lands on srcfile\n"; |
4cd232e4 | 2561 | if (q->has_statement_str) |
20e4a32c | 2562 | query_statement (i->second.name, i->second.decl_file, |
bcc12710 | 2563 | q->line, NULL, addr, q); |
4cd232e4 GH |
2564 | else |
2565 | query_func_info (i->first, i->second, q); | |
7e1279ea | 2566 | } |
20e4a32c RM |
2567 | } |
2568 | ||
2569 | for (map<Dwarf_Addr, inline_instance_info>::iterator i | |
897820ca GH |
2570 | = q->filtered_inlines.begin(); |
2571 | i != q->filtered_inlines.end(); ++i) | |
2572 | { | |
2573 | if (q->dw.die_has_pc (&(i->second.die), addr)) | |
7e1279ea | 2574 | { |
b0ee93c4 | 2575 | if (q->sess.verbose>3) |
db22e55f | 2576 | clog << "inline instance DIE lands on srcfile\n"; |
897820ca | 2577 | if (q->has_statement_str) |
20e4a32c | 2578 | query_statement (i->second.name, i->second.decl_file, |
897820ca GH |
2579 | q->line, NULL, addr, q); |
2580 | else | |
2581 | query_inline_instance_info (i->first, i->second, q); | |
2582 | } | |
20e4a32c | 2583 | } |
7e1279ea FCE |
2584 | } |
2585 | ||
2586 | ||
4fa7b22b | 2587 | static int |
7e1279ea | 2588 | query_dwarf_inline_instance (Dwarf_Die * die, void * arg) |
4fa7b22b GH |
2589 | { |
2590 | dwarf_query * q = static_cast<dwarf_query *>(arg); | |
7e1279ea | 2591 | assert (!q->has_statement_num); |
bd2b1e68 | 2592 | |
39bcd429 | 2593 | try |
7a053d3b | 2594 | { |
bb788f9f | 2595 | |
7e1279ea FCE |
2596 | bool record_this_inline = false; |
2597 | ||
b0ee93c4 | 2598 | if (q->sess.verbose>2) |
db22e55f | 2599 | clog << "examining inline instance of " << q->dw.function_name << "\n"; |
7e1279ea | 2600 | |
54efe513 | 2601 | if (q->has_inline_str || q->has_statement_str) |
7e1279ea | 2602 | record_this_inline = true; |
54efe513 GH |
2603 | |
2604 | else if (q->has_inline_num) | |
7e1279ea | 2605 | { |
54efe513 | 2606 | Dwarf_Addr query_addr = q->inline_num_val; |
20e4a32c | 2607 | |
7e1279ea FCE |
2608 | if (q->has_module) |
2609 | query_addr = q->dw.module_address_to_global(query_addr); | |
20e4a32c | 2610 | |
7e1279ea | 2611 | if (q->dw.die_has_pc (die, query_addr)) |
20e4a32c | 2612 | record_this_inline = true; |
7e1279ea FCE |
2613 | } |
2614 | ||
2615 | if (record_this_inline) | |
2616 | { | |
b0ee93c4 | 2617 | if (q->sess.verbose>2) |
db22e55f FCE |
2618 | clog << "selected inline instance of " << q->dw.function_name |
2619 | << "\n"; | |
7e1279ea FCE |
2620 | |
2621 | Dwarf_Addr entrypc; | |
2622 | if (q->dw.die_entrypc (die, &entrypc)) | |
2623 | { | |
2624 | inline_instance_info inl; | |
2625 | inl.die = *die; | |
2626 | inl.name = q->dw.function_name; | |
4cd232e4 GH |
2627 | q->dw.function_file (&inl.decl_file); |
2628 | q->dw.function_line (&inl.decl_line); | |
7e1279ea FCE |
2629 | q->filtered_inlines[entrypc] = inl; |
2630 | } | |
2631 | } | |
2632 | return DWARF_CB_OK; | |
2633 | } | |
2634 | catch (const semantic_error& e) | |
2635 | { | |
2636 | q->sess.print_error (e); | |
2637 | return DWARF_CB_ABORT; | |
2638 | } | |
2639 | } | |
bb788f9f | 2640 | |
7e1279ea | 2641 | static int |
20e4a32c | 2642 | query_dwarf_func (Dwarf_Die * func, void * arg) |
7e1279ea FCE |
2643 | { |
2644 | dwarf_query * q = static_cast<dwarf_query *>(arg); | |
2645 | assert (!q->has_statement_num); | |
bb788f9f | 2646 | |
7e1279ea FCE |
2647 | try |
2648 | { | |
2649 | // XXX: implement | |
2650 | if (q->has_callees) | |
2651 | throw semantic_error ("incomplete: do not know how to interpret .callees", | |
2652 | q->base_probe->tok); | |
20e4a32c | 2653 | |
7e1279ea FCE |
2654 | if (q->has_label) |
2655 | throw semantic_error ("incomplete: do not know how to interpret .label", | |
2656 | q->base_probe->tok); | |
2657 | ||
2658 | q->dw.focus_on_function (func); | |
2659 | ||
20e4a32c | 2660 | if (q->dw.func_is_inline () |
54efe513 | 2661 | && (((q->has_statement_str || q->has_inline_str) |
7e1279ea | 2662 | && q->dw.function_name_matches(q->function)) |
54efe513 | 2663 | || q->has_inline_num)) |
7e1279ea | 2664 | { |
b0ee93c4 | 2665 | if (q->sess.verbose>3) |
db22e55f FCE |
2666 | clog << "checking instances of inline " << q->dw.function_name |
2667 | << "\n"; | |
7e1279ea FCE |
2668 | q->dw.iterate_over_inline_instances (query_dwarf_inline_instance, arg); |
2669 | } | |
54efe513 | 2670 | else if (!q->dw.func_is_inline ()) |
20e4a32c | 2671 | { |
7e1279ea FCE |
2672 | bool record_this_function = false; |
2673 | ||
2674 | if ((q->has_statement_str || q->has_function_str) | |
2675 | && q->dw.function_name_matches(q->function)) | |
2676 | { | |
2677 | record_this_function = true; | |
2678 | } | |
2679 | else if (q->has_function_num) | |
2680 | { | |
2681 | Dwarf_Addr query_addr = q->function_num_val; | |
20e4a32c | 2682 | |
7e1279ea FCE |
2683 | if (q->has_module) |
2684 | query_addr = q->dw.module_address_to_global(query_addr); | |
2685 | ||
2686 | Dwarf_Die d; | |
2687 | q->dw.function_die (&d); | |
20e4a32c | 2688 | |
7e1279ea FCE |
2689 | if (q->dw.die_has_pc (&d, query_addr)) |
2690 | record_this_function = true; | |
2691 | } | |
2692 | ||
2693 | if (record_this_function) | |
2694 | { | |
b0ee93c4 | 2695 | if (q->sess.verbose>2) |
db22e55f | 2696 | clog << "selected function " << q->dw.function_name << "\n"; |
7e1279ea FCE |
2697 | |
2698 | Dwarf_Addr entrypc; | |
2699 | if (q->dw.function_entrypc (&entrypc)) | |
2700 | { | |
2701 | func_info func; | |
2702 | q->dw.function_die (&func.die); | |
2703 | func.name = q->dw.function_name; | |
4cd232e4 GH |
2704 | q->dw.function_file (&func.decl_file); |
2705 | q->dw.function_line (&func.decl_line); | |
7e1279ea FCE |
2706 | q->filtered_functions[entrypc] = func; |
2707 | } | |
20e4a32c RM |
2708 | else |
2709 | throw semantic_error("no entrypc found for function '" | |
2710 | + q->dw.function_name + "'"); | |
7e1279ea FCE |
2711 | } |
2712 | } | |
39bcd429 | 2713 | return DWARF_CB_OK; |
bd2b1e68 | 2714 | } |
39bcd429 | 2715 | catch (const semantic_error& e) |
bd2b1e68 | 2716 | { |
39bcd429 FCE |
2717 | q->sess.print_error (e); |
2718 | return DWARF_CB_ABORT; | |
bd2b1e68 | 2719 | } |
bd2b1e68 GH |
2720 | } |
2721 | ||
2722 | static int | |
2723 | query_cu (Dwarf_Die * cudie, void * arg) | |
2724 | { | |
20c6c071 | 2725 | dwarf_query * q = static_cast<dwarf_query *>(arg); |
7a053d3b | 2726 | |
39bcd429 | 2727 | try |
bd2b1e68 | 2728 | { |
7e1279ea | 2729 | q->dw.focus_on_cu (cudie); |
b5d77020 | 2730 | |
b0ee93c4 | 2731 | if (false && q->sess.verbose>2) |
b5d77020 | 2732 | clog << "focused on CU '" << q->dw.cu_name |
db22e55f | 2733 | << "', in module '" << q->dw.module_name << "'\n"; |
d9b516ca | 2734 | |
20e4a32c | 2735 | if (q->has_statement_str |
54efe513 GH |
2736 | || q->has_inline_str || q->has_inline_num |
2737 | || q->has_function_str || q->has_function_num) | |
7e1279ea FCE |
2738 | { |
2739 | q->filtered_srcfiles.clear(); | |
2740 | q->filtered_functions.clear(); | |
2741 | q->filtered_inlines.clear(); | |
2742 | ||
2743 | // In this path, we find "abstract functions", record | |
2744 | // information about them, and then (depending on lineno | |
2745 | // matching) possibly emit one or more of the function's | |
2746 | // associated addresses. Unfortunately the control of this | |
2747 | // cannot easily be turned inside out. | |
2748 | ||
54efe513 | 2749 | if ((q->has_statement_str || q->has_function_str || q->has_inline_str) |
7e1279ea FCE |
2750 | && (q->spec_type != function_alone)) |
2751 | { | |
2752 | // If we have a pattern string with a filename, we need | |
2753 | // to elaborate the srcfile mask in question first. | |
2754 | q->dw.collect_srcfiles_matching (q->file, q->filtered_srcfiles); | |
2755 | ||
2756 | // If we have a file pattern and *no* srcfile matches, there's | |
2757 | // no need to look further into this CU, so skip. | |
2758 | if (q->filtered_srcfiles.empty()) | |
2759 | return DWARF_CB_OK; | |
2760 | } | |
2761 | ||
2762 | // Pick up [entrypc, name, DIE] tuples for all the functions | |
2763 | // matching the query, and fill in the prologue endings of them | |
2764 | // all in a single pass. | |
2765 | q->dw.iterate_over_functions (query_dwarf_func, q); | |
44f75386 FCE |
2766 | |
2767 | if (q->sess.prologue_searching) | |
2768 | if (! q->filtered_functions.empty()) | |
2769 | q->dw.resolve_prologue_endings (q->filtered_functions); | |
7e1279ea | 2770 | |
54efe513 | 2771 | if ((q->has_statement_str || q->has_function_str || q->has_inline_str) |
7e1279ea FCE |
2772 | && (q->spec_type == function_file_and_line)) |
2773 | { | |
2774 | // If we have a pattern string with target *line*, we | |
20e4a32c | 2775 | // have to look at lines in all the matched srcfiles. |
7e1279ea FCE |
2776 | for (set<char const *>::const_iterator i = q->filtered_srcfiles.begin(); |
2777 | i != q->filtered_srcfiles.end(); ++i) | |
897820ca GH |
2778 | q->dw.iterate_over_srcfile_lines (*i, q->line, q->has_statement_str, |
2779 | query_srcfile_line, q); | |
7e1279ea FCE |
2780 | } |
2781 | else | |
2782 | { | |
54efe513 GH |
2783 | // Otherwise, simply probe all resolved functions (if |
2784 | // we're scanning functions) | |
2785 | if (q->has_statement_str || q->has_function_str || q->has_function_num) | |
2786 | for (map<Dwarf_Addr, func_info>::iterator i = q->filtered_functions.begin(); | |
2787 | i != q->filtered_functions.end(); ++i) | |
2788 | query_func_info (i->first, i->second, q); | |
20e4a32c | 2789 | |
54efe513 GH |
2790 | // Or all inline instances (if we're scanning inlines) |
2791 | if (q->has_statement_str || q->has_inline_str || q->has_inline_num) | |
20e4a32c | 2792 | for (map<Dwarf_Addr, inline_instance_info>::iterator i |
54efe513 GH |
2793 | = q->filtered_inlines.begin(); i != q->filtered_inlines.end(); ++i) |
2794 | query_inline_instance_info (i->first, i->second, q); | |
7e1279ea FCE |
2795 | |
2796 | } | |
2797 | } | |
39bcd429 FCE |
2798 | else |
2799 | { | |
7e1279ea FCE |
2800 | // Otherwise we have a statement number, and we can just |
2801 | // query it directly within this module. | |
2802 | ||
2803 | assert (q->has_statement_num); | |
2804 | Dwarf_Addr query_addr = q->statement_num_val; | |
2805 | if (q->has_module) | |
2806 | query_addr = q->dw.module_address_to_global(query_addr); | |
2807 | ||
bcc12710 | 2808 | query_statement ("", "", -1, NULL, query_addr, q); |
39bcd429 FCE |
2809 | } |
2810 | return DWARF_CB_OK; | |
bd2b1e68 | 2811 | } |
39bcd429 | 2812 | catch (const semantic_error& e) |
bd2b1e68 | 2813 | { |
39bcd429 FCE |
2814 | q->sess.print_error (e); |
2815 | return DWARF_CB_ABORT; | |
bd2b1e68 | 2816 | } |
bd2b1e68 GH |
2817 | } |
2818 | ||
0ce64fb8 | 2819 | |
1d3a40b6 DS |
2820 | static int |
2821 | query_kernel_module (Dwfl_Module *mod, | |
2822 | void **userdata __attribute__ ((unused)), | |
2823 | const char *name, | |
2824 | Dwarf_Addr base __attribute__ ((unused)), | |
2825 | void *arg) | |
2826 | { | |
2827 | if (TOK_KERNEL == name) | |
2828 | { | |
2829 | Dwfl_Module **m = (Dwfl_Module **)arg; | |
2830 | ||
2831 | *m = mod; | |
2832 | return DWARF_CB_ABORT; | |
2833 | } | |
2834 | return DWARF_CB_OK; | |
2835 | } | |
2836 | ||
2837 | ||
bd2b1e68 GH |
2838 | static int |
2839 | query_module (Dwfl_Module *mod __attribute__ ((unused)), | |
2840 | void **userdata __attribute__ ((unused)), | |
78f6bba6 | 2841 | const char *name, Dwarf_Addr, |
bd2b1e68 GH |
2842 | void *arg __attribute__ ((unused))) |
2843 | { | |
20c6c071 | 2844 | dwarf_query * q = static_cast<dwarf_query *>(arg); |
bd2b1e68 | 2845 | |
39bcd429 | 2846 | try |
e38d6504 | 2847 | { |
39bcd429 | 2848 | q->dw.focus_on_module(mod); |
d9b516ca | 2849 | |
39bcd429 FCE |
2850 | // If we have enough information in the pattern to skip a module and |
2851 | // the module does not match that information, return early. | |
d9b516ca | 2852 | |
39bcd429 FCE |
2853 | if (q->has_kernel && !q->dw.module_name_matches(TOK_KERNEL)) |
2854 | return DWARF_CB_OK; | |
d9b516ca | 2855 | |
39bcd429 FCE |
2856 | if (q->has_module && !q->dw.module_name_matches(q->module_val)) |
2857 | return DWARF_CB_OK; | |
b5d77020 | 2858 | |
c931ec8a FCE |
2859 | // Validate the machine code in this elf file against the |
2860 | // session machine. This is important, in case the wrong kind | |
2861 | // of debuginfo is being automagically processed by elfutils. | |
2862 | // Unfortunately, while we can tell i686 apart from x86-64, | |
2863 | // we can't help confusing i586 vs i686 (both EM_386). | |
2864 | ||
2865 | Dwarf_Addr _junk; | |
2866 | Elf* elf = dwfl_module_getelf (mod, &_junk); | |
2867 | Ebl* ebl = ebl_openbackend (elf); | |
2868 | int elf_machine = ebl_get_elfmachine (ebl); | |
2869 | const char* debug_filename = ""; | |
2870 | const char* main_filename = ""; | |
2871 | (void) dwfl_module_info (mod, NULL, NULL, | |
2872 | NULL, NULL, NULL, | |
2873 | & main_filename, | |
2874 | & debug_filename); | |
2875 | const string& sess_machine = q->sess.architecture; | |
2876 | string expect_machine; | |
2877 | switch (elf_machine) | |
2878 | { | |
2879 | case EM_386: expect_machine = "i686"; break; | |
2880 | case EM_X86_64: expect_machine = "x86_64"; break; | |
2881 | case EM_PPC: expect_machine = "ppc"; break; | |
2882 | case EM_PPC64: expect_machine = "ppc64"; break; | |
2883 | case EM_S390: expect_machine = "s390x"; break; | |
2884 | case EM_IA_64: expect_machine = "ia64"; break; | |
2885 | // XXX: fill in some more of these | |
2886 | default: expect_machine = "?"; break; | |
2887 | } | |
2888 | ||
2889 | if (! debug_filename) debug_filename = main_filename; | |
2890 | if (! debug_filename) debug_filename = name; | |
2891 | ||
2892 | if (sess_machine != expect_machine) | |
2893 | { | |
2894 | stringstream msg; | |
2895 | msg << "ELF machine " << expect_machine << " (code " << elf_machine | |
2896 | << ") mismatch with target " << sess_machine | |
2897 | << " in '" << debug_filename << "'"; | |
2898 | throw semantic_error(msg.str ()); | |
2899 | } | |
2900 | ||
b0ee93c4 | 2901 | if (q->sess.verbose>2) |
0ce64fb8 | 2902 | clog << "focused on module '" << q->dw.module_name |
c931ec8a | 2903 | << " = [" << hex << q->dw.module_start |
0ce64fb8 | 2904 | << "-" << q->dw.module_end |
c931ec8a FCE |
2905 | << ", bias " << q->dw.module_bias << "]" << dec |
2906 | << " file " << debug_filename | |
2907 | << " ELF machine " << expect_machine | |
2908 | << " (code " << elf_machine << ")" | |
2909 | << "\n"; | |
b5d77020 | 2910 | |
54efe513 | 2911 | if (q->has_inline_num || q->has_function_num || q->has_statement_num) |
39bcd429 FCE |
2912 | { |
2913 | // If we have module("foo").function(0xbeef) or | |
2914 | // module("foo").statement(0xbeef), the address is relative | |
2915 | // to the start of the module, so we seek the function | |
2916 | // number plus the module's bias. | |
7e1279ea | 2917 | |
39bcd429 FCE |
2918 | Dwarf_Addr addr; |
2919 | if (q->has_function_num) | |
2920 | addr = q->function_num_val; | |
54efe513 GH |
2921 | else if (q->has_inline_num) |
2922 | addr = q->inline_num_val; | |
39bcd429 FCE |
2923 | else |
2924 | addr = q->statement_num_val; | |
d9b516ca | 2925 | |
7e1279ea FCE |
2926 | // NB: We should not have kernel.* here; global addresses |
2927 | // should have bypassed query_module in dwarf_builder::build | |
2928 | // and gone directly to query_cu. | |
d9b516ca | 2929 | |
7e1279ea FCE |
2930 | assert (!q->has_kernel); |
2931 | assert (q->has_module); | |
2932 | q->dw.query_cu_containing_module_address(addr, q); | |
39bcd429 | 2933 | } |
50e0d793 | 2934 | else |
39bcd429 FCE |
2935 | { |
2936 | // Otherwise if we have a function("foo") or statement("foo") | |
2937 | // specifier, we have to scan over all the CUs looking for | |
7e1279ea | 2938 | // the function(s) in question |
e38d6504 | 2939 | |
c8959a29 | 2940 | q->dw.limit_search_to_function_pattern(q->function); |
7e1279ea | 2941 | |
54efe513 | 2942 | assert(q->has_function_str || q->has_inline_str || q->has_statement_str); |
39bcd429 | 2943 | q->dw.iterate_over_cus(&query_cu, q); |
d9b516ca | 2944 | |
7e1279ea FCE |
2945 | // If we just processed the module "kernel", and the user asked for |
2946 | // the kernel pattern, there's no need to iterate over any further | |
2947 | // modules | |
20e4a32c | 2948 | |
7e1279ea FCE |
2949 | if (q->has_kernel && q->dw.module_name_matches(TOK_KERNEL)) |
2950 | return DWARF_CB_ABORT; | |
2951 | } | |
bb788f9f | 2952 | |
39bcd429 | 2953 | return DWARF_CB_OK; |
7a053d3b | 2954 | } |
39bcd429 | 2955 | catch (const semantic_error& e) |
bd2b1e68 | 2956 | { |
39bcd429 FCE |
2957 | q->sess.print_error (e); |
2958 | return DWARF_CB_ABORT; | |
bd2b1e68 | 2959 | } |
bd2b1e68 GH |
2960 | } |
2961 | ||
2930abc7 | 2962 | |
35d4ab18 | 2963 | struct var_expanding_copy_visitor: public deep_copy_visitor |
77de5e9e | 2964 | { |
77de5e9e | 2965 | static unsigned tick; |
e57b735a | 2966 | stack<functioncall**> target_symbol_setter_functioncalls; |
77de5e9e | 2967 | |
35d4ab18 FCE |
2968 | var_expanding_copy_visitor() {} |
2969 | void visit_assignment (assignment* e); | |
2970 | }; | |
2971 | ||
2972 | ||
2973 | struct dwarf_var_expanding_copy_visitor: public var_expanding_copy_visitor | |
2974 | { | |
77de5e9e | 2975 | dwarf_query & q; |
bcc12710 | 2976 | Dwarf_Die *scope_die; |
77de5e9e | 2977 | Dwarf_Addr addr; |
8c819921 | 2978 | block *add_block; |
8fc05e57 | 2979 | probe *add_probe; |
cd5b28b2 | 2980 | std::map<std::string, symbol *> return_ts_map; |
77de5e9e | 2981 | |
35d4ab18 | 2982 | dwarf_var_expanding_copy_visitor(dwarf_query & q, Dwarf_Die *sd, Dwarf_Addr a): |
8fc05e57 | 2983 | q(q), scope_die(sd), addr(a), add_block(NULL), add_probe(NULL) {} |
d7f3e0c5 | 2984 | void visit_target_symbol (target_symbol* e); |
77de5e9e GH |
2985 | }; |
2986 | ||
2987 | ||
35d4ab18 | 2988 | |
77de5e9e GH |
2989 | unsigned var_expanding_copy_visitor::tick = 0; |
2990 | ||
77de5e9e | 2991 | void |
e57b735a | 2992 | var_expanding_copy_visitor::visit_assignment (assignment* e) |
77de5e9e | 2993 | { |
e57b735a GH |
2994 | // Our job would normally be to require() the left and right sides |
2995 | // into a new assignment. What we're doing is slightly trickier: | |
2996 | // we're pushing a functioncall** onto a stack, and if our left | |
2997 | // child sets the functioncall* for that value, we're going to | |
2998 | // assume our left child was a target symbol -- transformed into a | |
2999 | // set_target_foo(value) call, and it wants to take our right child | |
3000 | // as the argument "value". | |
3001 | // | |
3002 | // This is why some people claim that languages with | |
3003 | // constructor-decomposing case expressions have a leg up on | |
3004 | // visitors. | |
3005 | ||
3006 | functioncall *fcall = NULL; | |
3007 | expression *new_left, *new_right; | |
d9b516ca | 3008 | |
e57b735a GH |
3009 | target_symbol_setter_functioncalls.push (&fcall); |
3010 | require<expression*> (this, &new_left, e->left); | |
3011 | target_symbol_setter_functioncalls.pop (); | |
3012 | require<expression*> (this, &new_right, e->right); | |
3013 | ||
3014 | if (fcall != NULL) | |
77de5e9e | 3015 | { |
e57b735a GH |
3016 | // Our left child is informing us that it was a target variable |
3017 | // and it has been replaced with a set_target_foo() function | |
3018 | // call; we are going to provide that function call -- with the | |
3019 | // right child spliced in as sole argument -- in place of | |
3020 | // ourselves, in the deep copy we're in the middle of making. | |
3021 | ||
3022 | // FIXME: for the time being, we only support plan $foo = bar, | |
3023 | // not += or any other op= variant. This is fixable, but a bit | |
3024 | // ugly. | |
3025 | if (e->op != "=") | |
3026 | throw semantic_error ("Operator-assign expressions on target " | |
3027 | "variables not implemented", e->tok); | |
3028 | ||
3029 | assert (new_left == fcall); | |
3030 | fcall->args.push_back (new_right); | |
3031 | provide <expression*> (this, fcall); | |
77de5e9e | 3032 | } |
e57b735a GH |
3033 | else |
3034 | { | |
3035 | assignment* n = new assignment; | |
3036 | n->op = e->op; | |
3037 | n->tok = e->tok; | |
3038 | n->left = new_left; | |
3039 | n->right = new_right; | |
3040 | provide <assignment*> (this, n); | |
3041 | } | |
3042 | } | |
d9b516ca | 3043 | |
d7f3e0c5 | 3044 | |
e57b735a | 3045 | void |
35d4ab18 | 3046 | dwarf_var_expanding_copy_visitor::visit_target_symbol (target_symbol *e) |
e57b735a GH |
3047 | { |
3048 | assert(e->base_name.size() > 0 && e->base_name[0] == '$'); | |
3049 | ||
cf2a1f85 DS |
3050 | bool lvalue = is_active_lvalue(e); |
3051 | if (lvalue && !q.sess.guru_mode) | |
3052 | throw semantic_error("write to target variable not permitted", e->tok); | |
3053 | ||
3054 | if (q.has_return && e->base_name != "$return") | |
85ecf79a DS |
3055 | { |
3056 | if (lvalue) | |
3057 | throw semantic_error("write to target variable not permitted in .return probes", e->tok); | |
3058 | ||
cd5b28b2 DS |
3059 | // Get the full name of the target symbol. |
3060 | stringstream ts_name_stream; | |
3061 | e->print(ts_name_stream); | |
3062 | string ts_name = ts_name_stream.str(); | |
3063 | ||
3064 | // Check and make sure we haven't already seen this target | |
3065 | // variable in this return probe. If we have, just return our | |
3066 | // last replacement. | |
3067 | map<string, symbol *>::iterator i = return_ts_map.find(ts_name); | |
3068 | if (i != return_ts_map.end()) | |
3069 | { | |
3070 | provide <symbol*> (this, i->second); | |
3071 | return; | |
3072 | } | |
3073 | ||
85ecf79a DS |
3074 | // We've got to do several things here to handle target |
3075 | // variables in return probes. | |
3076 | ||
5e600bd6 DS |
3077 | // (1) Synthesize two global arrays. One is the cache of the |
3078 | // target variable and the other contains a thread specific | |
3079 | // nesting level counter. The arrays will look like | |
3080 | // this: | |
85ecf79a DS |
3081 | // |
3082 | // _dwarf_tvar_{name}_{num} | |
85ecf79a DS |
3083 | // _dwarf_tvar_{name}_{num}_ctr |
3084 | ||
3085 | string aname = (string("_dwarf_tvar_") | |
3086 | + e->base_name.substr(1) | |
3087 | + "_" + lex_cast<string>(tick++)); | |
3088 | vardecl* vd = new vardecl; | |
3089 | vd->name = aname; | |
3090 | vd->tok = e->tok; | |
3091 | q.sess.globals.push_back (vd); | |
3092 | ||
3093 | string ctrname = aname + "_ctr"; | |
3094 | vd = new vardecl; | |
3095 | vd->name = ctrname; | |
3096 | vd->tok = e->tok; | |
3097 | q.sess.globals.push_back (vd); | |
3098 | ||
8c819921 DS |
3099 | // (2) Create a new code block we're going to insert at the |
3100 | // beginning of this probe to get the cached value into a | |
3101 | // temporary variable. We'll replace the target variable | |
3102 | // reference with the temporary variable reference. The code | |
3103 | // will look like this: | |
3104 | // | |
3105 | // _dwarf_tvar_tid = tid() | |
3106 | // _dwarf_tvar_{name}_{num}_tmp | |
3107 | // = _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3108 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
3109 | // delete _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3110 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]--] | |
46392da3 DS |
3111 | // if (! _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]) |
3112 | // delete _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid] | |
8c819921 DS |
3113 | |
3114 | // (2a) Synthesize the tid temporary expression, which will look | |
85ecf79a DS |
3115 | // like this: |
3116 | // | |
8c819921 DS |
3117 | // _dwarf_tvar_tid = tid() |
3118 | symbol* tidsym = new symbol; | |
3119 | tidsym->name = string("_dwarf_tvar_tid"); | |
3120 | tidsym->tok = e->tok; | |
85ecf79a | 3121 | |
8c819921 DS |
3122 | if (add_block == NULL) |
3123 | { | |
8fc05e57 DS |
3124 | add_block = new block; |
3125 | add_block->tok = e->tok; | |
3126 | ||
3127 | // Synthesize a functioncall to grab the thread id. | |
3128 | functioncall* fc = new functioncall; | |
3129 | fc->tok = e->tok; | |
3130 | fc->function = string("tid"); | |
3131 | ||
3132 | // Assign the tid to '_dwarf_tvar_tid'. | |
3133 | assignment* a = new assignment; | |
3134 | a->tok = e->tok; | |
3135 | a->op = "="; | |
3136 | a->left = tidsym; | |
3137 | a->right = fc; | |
3138 | ||
3139 | expr_statement* es = new expr_statement; | |
3140 | es->tok = e->tok; | |
3141 | es->value = a; | |
3142 | add_block->statements.push_back (es); | |
8c819921 DS |
3143 | } |
3144 | ||
3145 | // (2b) Synthesize an array reference and assign it to a | |
3146 | // temporary variable (that we'll use as replacement for the | |
3147 | // target variable reference). It will look like this: | |
3148 | // | |
3149 | // _dwarf_tvar_{name}_{num}_tmp | |
3150 | // = _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3151 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
3152 | ||
8fc05e57 DS |
3153 | arrayindex* ai_tvar_base = new arrayindex; |
3154 | ai_tvar_base->tok = e->tok; | |
85ecf79a DS |
3155 | |
3156 | symbol* sym = new symbol; | |
3157 | sym->name = aname; | |
3158 | sym->tok = e->tok; | |
8fc05e57 | 3159 | ai_tvar_base->base = sym; |
8c819921 | 3160 | |
8fc05e57 | 3161 | ai_tvar_base->indexes.push_back(tidsym); |
85ecf79a | 3162 | |
8c819921 DS |
3163 | // We need to create a copy of the array index in its current |
3164 | // state so we can have 2 variants of it (the original and one | |
3165 | // that post-decrements the second index). | |
8fc05e57 DS |
3166 | arrayindex* ai_tvar = new arrayindex; |
3167 | arrayindex* ai_tvar_postdec = new arrayindex; | |
3168 | *ai_tvar = *ai_tvar_base; | |
3169 | *ai_tvar_postdec = *ai_tvar_base; | |
85ecf79a | 3170 | |
8c819921 DS |
3171 | // Synthesize the |
3172 | // "_dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]" used as the | |
85ecf79a | 3173 | // second index into the array. |
8c819921 DS |
3174 | arrayindex* ai_ctr = new arrayindex; |
3175 | ai_ctr->tok = e->tok; | |
5e600bd6 | 3176 | |
85ecf79a DS |
3177 | sym = new symbol; |
3178 | sym->name = ctrname; | |
3179 | sym->tok = e->tok; | |
8c819921 DS |
3180 | ai_ctr->base = sym; |
3181 | ai_ctr->indexes.push_back(tidsym); | |
3182 | ai_tvar->indexes.push_back(ai_ctr); | |
3183 | ||
3184 | symbol* tmpsym = new symbol; | |
3185 | tmpsym->name = aname + "_tmp"; | |
3186 | tmpsym->tok = e->tok; | |
3187 | ||
3188 | assignment* a = new assignment; | |
3189 | a->tok = e->tok; | |
3190 | a->op = "="; | |
3191 | a->left = tmpsym; | |
3192 | a->right = ai_tvar; | |
3193 | ||
3194 | expr_statement* es = new expr_statement; | |
3195 | es->tok = e->tok; | |
3196 | es->value = a; | |
3197 | ||
3198 | add_block->statements.push_back (es); | |
3199 | ||
3200 | // (2c) Add a post-decrement to the second array index and | |
3201 | // delete the array value. It will look like this: | |
3202 | // | |
3203 | // delete _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3204 | // _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]--] | |
5e600bd6 | 3205 | |
85ecf79a DS |
3206 | post_crement* pc = new post_crement; |
3207 | pc->tok = e->tok; | |
3208 | pc->op = "--"; | |
8c819921 | 3209 | pc->operand = ai_ctr; |
8fc05e57 | 3210 | ai_tvar_postdec->indexes.push_back(pc); |
8c819921 DS |
3211 | |
3212 | delete_statement* ds = new delete_statement; | |
3213 | ds->tok = e->tok; | |
8fc05e57 | 3214 | ds->value = ai_tvar_postdec; |
8c819921 DS |
3215 | |
3216 | add_block->statements.push_back (ds); | |
85ecf79a | 3217 | |
46392da3 DS |
3218 | // (2d) Delete the counter value if it is 0. It will look like |
3219 | // this: | |
3220 | // if (! _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]) | |
3221 | // delete _dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid] | |
3222 | ||
3223 | ds = new delete_statement; | |
3224 | ds->tok = e->tok; | |
3225 | ds->value = ai_ctr; | |
3226 | ||
3227 | unary_expression *ue = new unary_expression; | |
3228 | ue->tok = e->tok; | |
3229 | ue->op = "!"; | |
3230 | ue->operand = ai_ctr; | |
3231 | ||
3232 | if_statement *ifs = new if_statement; | |
3233 | ifs->tok = e->tok; | |
3234 | ifs->condition = ue; | |
3235 | ifs->thenblock = ds; | |
3236 | ifs->elseblock = NULL; | |
3237 | ||
3238 | add_block->statements.push_back (ifs); | |
3239 | ||
85ecf79a | 3240 | // (3) We need an entry probe that saves the value for us in the |
8fc05e57 DS |
3241 | // global array we created. Create the entry probe, which will |
3242 | // look like this: | |
85ecf79a | 3243 | // |
85ecf79a | 3244 | // probe kernel.function("{function}") { |
8fc05e57 DS |
3245 | // _dwarf_tvar_tid = tid() |
3246 | // _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3247 | // ++_dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
85ecf79a DS |
3248 | // = ${param} |
3249 | // } | |
3250 | ||
8fc05e57 | 3251 | if (add_probe == NULL) |
85ecf79a | 3252 | { |
8fc05e57 DS |
3253 | add_probe = new probe; |
3254 | add_probe->tok = e->tok; | |
3255 | ||
3256 | // We need the name of the current probe point, minus the | |
3257 | // ".return" (or anything after it, such as ".maxactive(N)"). | |
3258 | // Create a new probe point, copying all the components, | |
3259 | // stopping when we see the ".return" component. | |
3260 | probe_point* pp = new probe_point; | |
3261 | for (unsigned c = 0; c < q.base_loc->components.size(); c++) | |
3262 | { | |
3263 | if (q.base_loc->components[c]->functor == "return") | |
3264 | break; | |
3265 | else | |
3266 | pp->components.push_back(q.base_loc->components[c]); | |
3267 | } | |
3268 | pp->tok = e->tok; | |
3269 | pp->optional = q.base_loc->optional; | |
3270 | add_probe->locations.push_back(pp); | |
3271 | ||
3272 | add_probe->body = new block; | |
3273 | add_probe->body->tok = e->tok; | |
3274 | ||
3275 | // Synthesize a functioncall to grab the thread id. | |
3276 | functioncall* fc = new functioncall; | |
3277 | fc->tok = e->tok; | |
3278 | fc->function = string("tid"); | |
3279 | ||
3280 | // Assign the tid to '_dwarf_tvar_tid'. | |
3281 | assignment* a = new assignment; | |
3282 | a->tok = e->tok; | |
3283 | a->op = "="; | |
3284 | a->left = tidsym; | |
3285 | a->right = fc; | |
3286 | ||
3287 | expr_statement* es = new expr_statement; | |
3288 | es->tok = e->tok; | |
3289 | es->value = a; | |
3290 | add_probe->body->statements.push_back (es); | |
3291 | ||
3292 | vardecl* vd = new vardecl; | |
3293 | vd->tok = e->tok; | |
3294 | vd->name = tidsym->name; | |
3295 | vd->type = pe_long; | |
3296 | vd->set_arity(0); | |
3297 | add_probe->locals.push_back(vd); | |
85ecf79a | 3298 | } |
8fc05e57 DS |
3299 | |
3300 | // Save the value, like this: | |
3301 | // _dwarf_tvar_{name}_{num}[_dwarf_tvar_tid, | |
3302 | // ++_dwarf_tvar_{name}_{num}_ctr[_dwarf_tvar_tid]] | |
3303 | // = ${param} | |
3304 | arrayindex* ai_tvar_preinc = new arrayindex; | |
3305 | *ai_tvar_preinc = *ai_tvar_base; | |
3306 | ||
3307 | pre_crement* preinc = new pre_crement; | |
3308 | preinc->tok = e->tok; | |
3309 | preinc->op = "++"; | |
3310 | preinc->operand = ai_ctr; | |
3311 | ai_tvar_preinc->indexes.push_back(preinc); | |
3312 | ||
3313 | a = new assignment; | |
3314 | a->tok = e->tok; | |
3315 | a->op = "="; | |
3316 | a->left = ai_tvar_preinc; | |
3317 | a->right = e; | |
3318 | ||
3319 | es = new expr_statement; | |
3320 | es->tok = e->tok; | |
3321 | es->value = a; | |
3322 | ||
3323 | add_probe->body->statements.push_back (es); | |
85ecf79a | 3324 | |
8c819921 DS |
3325 | // (4) Provide the '_dwarf_tvar_{name}_{num}_tmp' variable to |
3326 | // our parent so it can be used as a substitute for the target | |
3327 | // symbol. | |
3328 | provide <symbol*> (this, tmpsym); | |
cd5b28b2 DS |
3329 | |
3330 | // (5) Remember this replacement since we might be able to reuse | |
3331 | // it later if the same return probe references this target | |
3332 | // symbol again. | |
3333 | return_ts_map[ts_name] = tmpsym; | |
85ecf79a DS |
3334 | return; |
3335 | } | |
cf2a1f85 | 3336 | |
e57b735a | 3337 | // Synthesize a function. |
d7f3e0c5 | 3338 | functiondecl *fdecl = new functiondecl; |
7b99c7d3 | 3339 | fdecl->tok = e->tok; |
d7f3e0c5 | 3340 | embeddedcode *ec = new embeddedcode; |
5e309481 | 3341 | ec->tok = e->tok; |
e8fbc5e8 | 3342 | |
1b07c728 | 3343 | string fname = (string(lvalue ? "_dwarf_tvar_set" : "_dwarf_tvar_get") |
20e4a32c | 3344 | + "_" + e->base_name.substr(1) |
e57b735a GH |
3345 | + "_" + lex_cast<string>(tick++)); |
3346 | ||
66d284f4 | 3347 | try |
e57b735a | 3348 | { |
e19fda4e DS |
3349 | if (q.has_return && e->base_name == "$return") |
3350 | { | |
3351 | ec->code = q.dw.literal_stmt_for_return (scope_die, | |
3352 | addr, | |
3353 | e->components, | |
3354 | lvalue, | |
3355 | fdecl->type); | |
3356 | } | |
3357 | else | |
3358 | { | |
3359 | ec->code = q.dw.literal_stmt_for_local (scope_die, | |
3360 | addr, | |
3361 | e->base_name.substr(1), | |
3362 | e->components, | |
3363 | lvalue, | |
3364 | fdecl->type); | |
3365 | } | |
3366 | ||
1b07c728 FCE |
3367 | if (! lvalue) |
3368 | ec->code += "/* pure */"; | |
66d284f4 FCE |
3369 | } |
3370 | catch (const semantic_error& er) | |
3371 | { | |
cbfbbf69 FCE |
3372 | // We suppress this error message, and pass the unresolved |
3373 | // target_symbol to the next pass. We hope that this value ends | |
3374 | // up not being referenced after all, so it can be optimized out | |
3375 | // quietly. | |
3376 | provide <target_symbol*> (this, e); | |
9f36b77f FCE |
3377 | semantic_error* saveme = new semantic_error (er); // copy it |
3378 | saveme->tok1 = e->tok; // XXX: token not passed to q.dw code generation routines | |
7e41d3dc FCE |
3379 | // NB: we can have multiple errors, since a $target variable |
3380 | // may be expanded in several different contexts: | |
3381 | // function ("*") { $var } | |
3382 | saveme->chain = e->saved_conversion_error; | |
9f36b77f | 3383 | e->saved_conversion_error = saveme; |
1cde5ba5 JS |
3384 | delete fdecl; |
3385 | delete ec; | |
cbfbbf69 | 3386 | return; |
66d284f4 | 3387 | } |
e57b735a | 3388 | |
d7f3e0c5 GH |
3389 | fdecl->name = fname; |
3390 | fdecl->body = ec; | |
e57b735a GH |
3391 | if (lvalue) |
3392 | { | |
3393 | // Modify the fdecl so it carries a single pe_long formal | |
3394 | // argument called "value". | |
3395 | ||
3396 | // FIXME: For the time being we only support setting target | |
3397 | // variables which have base types; these are 'pe_long' in | |
3398 | // stap's type vocabulary. Strings and pointers might be | |
3399 | // reasonable, some day, but not today. | |
3400 | ||
3401 | vardecl *v = new vardecl; | |
3402 | v->type = pe_long; | |
3403 | v->name = "value"; | |
3404 | v->tok = e->tok; | |
3405 | fdecl->formal_args.push_back(v); | |
3406 | } | |
d7f3e0c5 | 3407 | q.sess.functions.push_back(fdecl); |
d9b516ca | 3408 | |
e57b735a | 3409 | // Synthesize a functioncall. |
d7f3e0c5 GH |
3410 | functioncall* n = new functioncall; |
3411 | n->tok = e->tok; | |
3412 | n->function = fname; | |
35d4ab18 | 3413 | n->referent = 0; // NB: must not resolve yet, to ensure inclusion in session |
e57b735a GH |
3414 | |
3415 | if (lvalue) | |
3416 | { | |
3417 | // Provide the functioncall to our parent, so that it can be | |
3418 | // used to substitute for the assignment node immediately above | |
3419 | // us. | |
3420 | assert(!target_symbol_setter_functioncalls.empty()); | |
3421 | *(target_symbol_setter_functioncalls.top()) = n; | |
3422 | } | |
3423 | ||
d9b516ca | 3424 | provide <functioncall*> (this, n); |
77de5e9e GH |
3425 | } |
3426 | ||
3427 | ||
dc38c0ae | 3428 | void |
b20febf3 FCE |
3429 | dwarf_derived_probe::join_group (systemtap_session& s) |
3430 | { | |
3431 | if (! s.dwarf_derived_probes) | |
3432 | s.dwarf_derived_probes = new dwarf_derived_probe_group (); | |
3433 | s.dwarf_derived_probes->enroll (this); | |
3434 | } | |
3435 | ||
3436 | ||
3437 | dwarf_derived_probe::dwarf_derived_probe(const string& funcname, | |
3438 | const string& filename, | |
3439 | int line, | |
3440 | // module & section speficy a relocation | |
3441 | // base for <addr>, unless section=="" | |
3442 | // (equivalently module=="kernel") | |
3443 | const string& module, | |
3444 | const string& section, | |
3445 | // NB: dwfl_addr is the virtualized | |
3446 | // address for this symbol. | |
3447 | Dwarf_Addr dwfl_addr, | |
3448 | // addr is the section-offset for | |
3449 | // actual relocation. | |
3450 | Dwarf_Addr addr, | |
3451 | dwarf_query& q, | |
3452 | Dwarf_Die* scope_die) | |
3453 | : derived_probe (q.base_probe, 0 /* location-less */), | |
3454 | module (module), section (section), addr (addr), | |
c9bad430 DS |
3455 | has_return (q.has_return), |
3456 | has_maxactive (q.has_maxactive), | |
3457 | maxactive_val (q.maxactive_val) | |
bd2b1e68 | 3458 | { |
b20febf3 FCE |
3459 | // Assert relocation invariants |
3460 | if (module == TOK_KERNEL && section != "") | |
3461 | throw semantic_error ("relocation requested against kernel", q.base_loc->tok); | |
3462 | if (module != TOK_KERNEL && section == "") | |
3463 | throw semantic_error ("missing relocation base against module", q.base_loc->tok); | |
3464 | if (module != TOK_KERNEL && section != "" && dwfl_addr == addr) // addr should be an offset | |
3465 | throw semantic_error ("inconsistent relocation address", q.base_loc->tok); | |
df8fadee | 3466 | |
b20febf3 | 3467 | // Make a target-variable-expanded copy of the probe body |
2930abc7 | 3468 | |
b20febf3 FCE |
3469 | dwarf_var_expanding_copy_visitor v (q, scope_die, dwfl_addr); |
3470 | require <block*> (&v, &(this->body), q.base_probe->body); | |
3471 | this->tok = q.base_probe->tok; | |
2930abc7 | 3472 | |
8c819921 DS |
3473 | // If when target-variable-expanding the probe, we added a new block |
3474 | // of code, add it to the start of the probe. | |
3475 | if (v.add_block) | |
3476 | this->body->statements.insert(this->body->statements.begin(), v.add_block); | |
3477 | ||
8fc05e57 DS |
3478 | // If when target-variable-expanding the probe, we added a new |
3479 | // probe, add it in a new file to the list of files to be processed. | |
3480 | if (v.add_probe) | |
3481 | { | |
3482 | stapfile *f = new stapfile; | |
3483 | f->probes.push_back(v.add_probe); | |
3484 | q.sess.files.push_back(f); | |
3485 | } | |
3486 | ||
b20febf3 FCE |
3487 | // Set the sole element of the "locations" vector as a |
3488 | // "reverse-engineered" form of the incoming (q.base_loc) probe | |
3489 | // point. This allows a user to see what function / file / line | |
3490 | // number any particular match of the wildcards. | |
2930abc7 | 3491 | |
a229fcd7 GH |
3492 | vector<probe_point::component*> comps; |
3493 | comps.push_back | |
b20febf3 | 3494 | (module == TOK_KERNEL |
a229fcd7 | 3495 | ? new probe_point::component(TOK_KERNEL) |
b20febf3 | 3496 | : new probe_point::component(TOK_MODULE, new literal_string(module))); |
b5d77020 | 3497 | |
db520b00 FCE |
3498 | string fn_or_stmt; |
3499 | if (q.has_function_str || q.has_function_num) | |
3500 | fn_or_stmt = "function"; | |
2508b230 | 3501 | else if (q.has_inline_str || q.has_inline_num) |
54efe513 | 3502 | fn_or_stmt = "inline"; |
db520b00 FCE |
3503 | else |
3504 | fn_or_stmt = "statement"; | |
a229fcd7 | 3505 | |
54efe513 | 3506 | if (q.has_function_str || q.has_inline_str || q.has_statement_str) |
db520b00 | 3507 | { |
4cd232e4 | 3508 | string retro_name = funcname; |
b20febf3 | 3509 | if (filename != "") |
4cd232e4 GH |
3510 | retro_name += ("@" + string (filename)); |
3511 | if (line != -1) | |
3512 | retro_name += (":" + lex_cast<string> (line)); | |
db520b00 FCE |
3513 | comps.push_back |
3514 | (new probe_point::component | |
3515 | (fn_or_stmt, new literal_string (retro_name))); | |
3516 | } | |
54efe513 | 3517 | else if (q.has_function_num || q.has_inline_num || q.has_statement_num) |
db520b00 FCE |
3518 | { |
3519 | Dwarf_Addr retro_addr; | |
3520 | if (q.has_function_num) | |
3521 | retro_addr = q.function_num_val; | |
54efe513 GH |
3522 | else if (q.has_inline_num) |
3523 | retro_addr = q.inline_num_val; | |
db520b00 FCE |
3524 | else |
3525 | retro_addr = q.statement_num_val; | |
db520b00 FCE |
3526 | comps.push_back (new probe_point::component |
3527 | (fn_or_stmt, | |
3528 | new literal_number(retro_addr))); // XXX: should be hex if possible | |
a229fcd7 GH |
3529 | } |
3530 | ||
db520b00 | 3531 | if (has_return) |
c9bad430 DS |
3532 | { |
3533 | comps.push_back (new probe_point::component(TOK_RETURN)); | |
3534 | if (has_maxactive) | |
3535 | comps.push_back (new probe_point::component | |
3536 | (TOK_MAXACTIVE, new literal_number(maxactive_val))); | |
3537 | } | |
d9b516ca | 3538 | |
b20febf3 | 3539 | locations.push_back(new probe_point(comps, q.base_loc->tok)); |
2930abc7 FCE |
3540 | } |
3541 | ||
bd2b1e68 | 3542 | |
7a053d3b | 3543 | void |
20c6c071 | 3544 | dwarf_derived_probe::register_relative_variants(match_node * root, |
bd2b1e68 GH |
3545 | dwarf_builder * dw) |
3546 | { | |
3547 | // Here we match 2 forms: | |
3548 | // | |
3549 | // . | |
3550 | // .relative(NN) | |
3551 | ||
20c6c071 GH |
3552 | root->bind(dw); |
3553 | root->bind_num(TOK_RELATIVE)->bind(dw); | |
bd2b1e68 GH |
3554 | } |
3555 | ||
7a053d3b | 3556 | void |
20c6c071 | 3557 | dwarf_derived_probe::register_statement_variants(match_node * root, |
bd2b1e68 GH |
3558 | dwarf_builder * dw) |
3559 | { | |
3560 | // Here we match 3 forms: | |
3561 | // | |
3562 | // . | |
3563 | // .return | |
3564 | // .label("foo") | |
7a053d3b | 3565 | |
bd2b1e68 | 3566 | register_relative_variants(root, dw); |
20c6c071 | 3567 | register_relative_variants(root->bind_str(TOK_LABEL), dw); |
bd2b1e68 GH |
3568 | } |
3569 | ||
54efe513 GH |
3570 | void |
3571 | dwarf_derived_probe::register_inline_variants(match_node * root, | |
3572 | dwarf_builder * dw) | |
3573 | { | |
3574 | // Here we match 4 forms: | |
3575 | // | |
3576 | // . | |
3577 | // .callees | |
3578 | // .callees(N) | |
3579 | // | |
3580 | // The last form permits N-level callee resolving without any | |
3581 | // recursive .callees.callees.callees... pattern-matching on our part. | |
3582 | ||
3583 | root->bind(dw); | |
3584 | root->bind(TOK_CALLEES)->bind(dw); | |
3585 | root->bind_num(TOK_CALLEES)->bind(dw); | |
3586 | } | |
3587 | ||
7a053d3b | 3588 | void |
fd6602a0 | 3589 | dwarf_derived_probe::register_function_variants(match_node * root, |
c9bad430 | 3590 | dwarf_builder * dw) |
bd2b1e68 | 3591 | { |
c9bad430 | 3592 | // Here we match 5 forms: |
bd2b1e68 GH |
3593 | // |
3594 | // . | |
fd6602a0 | 3595 | // .return |
c9bad430 | 3596 | // .return.maxactive(N) |
bd2b1e68 GH |
3597 | // .callees |
3598 | // .callees(N) | |
3599 | // | |
3600 | // The last form permits N-level callee resolving without any | |
3601 | // recursive .callees.callees.callees... pattern-matching on our part. | |
3602 | ||
fd6602a0 FCE |
3603 | root->bind(dw); |
3604 | root->bind(TOK_RETURN)->bind(dw); | |
c9bad430 | 3605 | root->bind(TOK_RETURN)->bind_num(TOK_MAXACTIVE)->bind(dw); |
fd6602a0 FCE |
3606 | root->bind(TOK_CALLEES)->bind(dw); |
3607 | root->bind_num(TOK_CALLEES)->bind(dw); | |
bd2b1e68 GH |
3608 | } |
3609 | ||
7a053d3b | 3610 | void |
20c6c071 | 3611 | dwarf_derived_probe::register_function_and_statement_variants(match_node * root, |
bd2b1e68 GH |
3612 | dwarf_builder * dw) |
3613 | { | |
3614 | // Here we match 4 forms: | |
3615 | // | |
3616 | // .function("foo") | |
3617 | // .function(0xdeadbeef) | |
54efe513 GH |
3618 | // .inline("foo") |
3619 | // .inline(0xdeadbeef) | |
bd2b1e68 GH |
3620 | // .statement("foo") |
3621 | // .statement(0xdeadbeef) | |
3622 | ||
fd6602a0 FCE |
3623 | register_function_variants(root->bind_str(TOK_FUNCTION), dw); |
3624 | register_function_variants(root->bind_num(TOK_FUNCTION), dw); | |
54efe513 GH |
3625 | register_inline_variants(root->bind_str(TOK_INLINE), dw); |
3626 | register_inline_variants(root->bind_num(TOK_INLINE), dw); | |
20c6c071 GH |
3627 | register_statement_variants(root->bind_str(TOK_STATEMENT), dw); |
3628 | register_statement_variants(root->bind_num(TOK_STATEMENT), dw); | |
bd2b1e68 GH |
3629 | } |
3630 | ||
3631 | void | |
20c6c071 | 3632 | dwarf_derived_probe::register_patterns(match_node * root) |
bd2b1e68 GH |
3633 | { |
3634 | dwarf_builder *dw = new dwarf_builder(); | |
3635 | ||
3636 | // Here we match 3 forms: | |
3637 | // | |
3638 | // .kernel | |
3639 | // .module("foo") | |
3640 | // .process("foo") | |
3641 | ||
20c6c071 GH |
3642 | register_function_and_statement_variants(root->bind(TOK_KERNEL), dw); |
3643 | register_function_and_statement_variants(root->bind_str(TOK_MODULE), dw); | |
ab55a5ae | 3644 | // register_function_and_statement_variants(root->bind_str(TOK_PROCESS), dw); |
bd2b1e68 GH |
3645 | } |
3646 | ||
2930abc7 | 3647 | |
b20febf3 | 3648 | // ------------------------------------------------------------------------ |
46b84a80 DS |
3649 | |
3650 | void | |
b20febf3 | 3651 | dwarf_derived_probe_group::enroll (dwarf_derived_probe* p) |
46b84a80 | 3652 | { |
b20febf3 | 3653 | probes_by_module.insert (make_pair (p->module, p)); |
b55bc428 FCE |
3654 | } |
3655 | ||
2930abc7 | 3656 | |
7a053d3b | 3657 | void |
b20febf3 | 3658 | dwarf_derived_probe_group::emit_module_decls (systemtap_session& s) |
ec4373ff | 3659 | { |
b20febf3 | 3660 | if (probes_by_module.empty()) return; |
2930abc7 | 3661 | |
b20febf3 | 3662 | s.op->newline() << "/* ---- dwarf probes ---- */"; |
2930abc7 | 3663 | |
f41595cc FCE |
3664 | // Warn of misconfigured kernels |
3665 | s.op->newline() << "#if ! defined(CONFIG_KPROBES)"; | |
3666 | s.op->newline() << "#error \"Need CONFIG_KPROBES!\""; | |
3667 | s.op->newline() << "#endif"; | |
3668 | s.op->newline(); | |
3669 | ||
b20febf3 FCE |
3670 | // Forward declare the master entry functions |
3671 | s.op->newline() << "static int enter_kprobe_probe (struct kprobe *inst,"; | |
3672 | s.op->line() << " struct pt_regs *regs);"; | |
3673 | s.op->newline() << "static int enter_kretprobe_probe (struct kretprobe_instance *inst,"; | |
3674 | s.op->line() << " struct pt_regs *regs);"; | |
3675 | ||
3676 | // Emit the actual probe list. | |
3677 | s.op->newline() << "struct stap_dwarf_probe {"; | |
3678 | s.op->newline(1) << "union { struct kprobe kp; struct kretprobe krp; } u;"; | |
3679 | s.op->newline() << "unsigned return_p:1;"; | |
c9bad430 | 3680 | s.op->newline() << "unsigned maxactive_p:1;"; |
b20febf3 FCE |
3681 | s.op->newline() << "unsigned registered_p:1;"; |
3682 | s.op->newline() << "const char *module;"; | |
3683 | s.op->newline() << "const char *section;"; | |
3684 | s.op->newline() << "unsigned long address;"; | |
c9bad430 | 3685 | s.op->newline() << "unsigned long maxactive_val;"; |
b20febf3 FCE |
3686 | s.op->newline() << "const char *pp;"; |
3687 | s.op->newline() << "void (*ph) (struct context*);"; | |
3688 | s.op->newline(-1) << "} stap_dwarf_probes[] = {"; | |
3689 | s.op->indent(1); | |
3690 | ||
3691 | for (p_b_m_iterator it = probes_by_module.begin(); it != probes_by_module.end(); it++) | |
2930abc7 | 3692 | { |
b20febf3 FCE |
3693 | dwarf_derived_probe* p = it->second; |
3694 | s.op->newline() << "{"; | |
3695 | if (p->has_return) | |
3696 | s.op->line() << " .return_p=1,"; | |
c9bad430 DS |
3697 | if (p->has_maxactive) |
3698 | s.op->line() << " .maxactive_p=1,"; | |
b20febf3 FCE |
3699 | if (p->module != TOK_KERNEL) // relocation info |
3700 | s.op->line() << " .module=\"" << p->module << "\", .section=\"" << p->section << "\","; | |
3701 | s.op->line() << " .address=0x" << hex << p->addr << dec << "UL,"; | |
c9bad430 DS |
3702 | if (p->has_maxactive) |
3703 | s.op->line() << " .maxactive_val=" << p->maxactive_val << "UL,"; | |
b20febf3 FCE |
3704 | s.op->line() << " .pp=" << lex_cast_qstring (*p->sole_location()) << ","; |
3705 | s.op->line() << " .ph=&" << p->name; | |
3706 | s.op->line() << " },"; | |
2930abc7 | 3707 | } |
2930abc7 | 3708 | |
b20febf3 FCE |
3709 | s.op->newline(-1) << "};"; |
3710 | ||
3711 | // Emit the kprobes callback function | |
3712 | s.op->newline(); | |
3713 | s.op->newline() << "static int enter_kprobe_probe (struct kprobe *inst,"; | |
3714 | s.op->line() << " struct pt_regs *regs) {"; | |
3715 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = container_of(inst, struct stap_dwarf_probe, u.kp);"; | |
3716 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING"); | |
3717 | s.op->newline() << "c->probe_point = sdp->pp;"; | |
3718 | s.op->newline() << "c->regs = regs;"; | |
3719 | s.op->newline() << "(*sdp->ph) (c);"; | |
3720 | common_probe_entryfn_epilogue (s.op); | |
3721 | s.op->newline() << "return 0;"; | |
3722 | s.op->newline(-1) << "}"; | |
3723 | ||
3724 | // Same for kretprobes | |
3725 | s.op->newline(); | |
3726 | s.op->newline() << "static int enter_kretprobe_probe (struct kretprobe_instance *inst,"; | |
3727 | s.op->line() << " struct pt_regs *regs) {"; | |
3728 | s.op->newline(1) << "struct kretprobe *krp = inst->rp;"; | |
3729 | s.op->newline() << "struct stap_dwarf_probe *sdp = container_of(krp, struct stap_dwarf_probe, u.krp);"; | |
3730 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING"); | |
3731 | s.op->newline() << "c->probe_point = sdp->pp;"; | |
3732 | s.op->newline() << "c->regs = regs;"; | |
3733 | s.op->newline() << "c->pi = inst;"; // for assisting runtime's backtrace logic | |
3734 | s.op->newline() << "(*sdp->ph) (c);"; | |
3735 | common_probe_entryfn_epilogue (s.op); | |
3736 | s.op->newline() << "return 0;"; | |
3737 | s.op->newline(-1) << "}"; | |
20c6c071 | 3738 | } |
ec4373ff | 3739 | |
20c6c071 | 3740 | |
dc38c0ae | 3741 | void |
b20febf3 FCE |
3742 | dwarf_derived_probe_group::emit_module_init (systemtap_session& s) |
3743 | { | |
3744 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; | |
3745 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
f1bad60c | 3746 | s.op->newline() << "unsigned long relocated_addr = _stp_module_relocate (sdp->module, sdp->section, sdp->address);"; |
b20febf3 | 3747 | s.op->newline() << "if (relocated_addr == 0) continue;"; // quietly; assume module is absent |
6f313a73 | 3748 | s.op->newline() << "probe_point = sdp->pp;"; |
b20febf3 FCE |
3749 | s.op->newline() << "if (sdp->return_p) {"; |
3750 | s.op->newline(1) << "sdp->u.krp.kp.addr = (void *) relocated_addr;"; | |
c9bad430 DS |
3751 | s.op->newline() << "if (sdp->maxactive_p) {"; |
3752 | s.op->newline(1) << "sdp->u.krp.maxactive = sdp->maxactive_val;"; | |
3753 | s.op->newline(-1) << "} else {"; | |
3754 | s.op->newline(1) << "sdp->u.krp.maxactive = max(10, 4*NR_CPUS);"; | |
3755 | s.op->newline(-1) << "}"; | |
b20febf3 FCE |
3756 | s.op->newline() << "sdp->u.krp.handler = &enter_kretprobe_probe;"; |
3757 | s.op->newline() << "rc = register_kretprobe (& sdp->u.krp);"; | |
3758 | s.op->newline(-1) << "} else {"; | |
3759 | s.op->newline(1) << "sdp->u.kp.addr = (void *) relocated_addr;"; | |
3760 | s.op->newline() << "sdp->u.kp.pre_handler = &enter_kprobe_probe;"; | |
3761 | s.op->newline() << "rc = register_kprobe (& sdp->u.kp);"; | |
3762 | s.op->newline(-1) << "}"; | |
3763 | s.op->newline() << "if (rc) for (j=i-1; j>=0; j--) {"; // partial rollback | |
3764 | s.op->newline(1) << "struct stap_dwarf_probe *sdp2 = & stap_dwarf_probes[j];"; | |
3765 | s.op->newline() << "if (sdp2->return_p) unregister_kretprobe (&sdp2->u.krp);"; | |
3766 | s.op->newline() << "else unregister_kprobe (&sdp2->u.kp);"; | |
3767 | s.op->newline(-1) << "}"; | |
3768 | s.op->newline() << "else sdp->registered_p = 1;"; | |
3769 | s.op->newline(-1) << "}"; // for loop | |
dc38c0ae DS |
3770 | } |
3771 | ||
3772 | ||
46b84a80 | 3773 | void |
b20febf3 | 3774 | dwarf_derived_probe_group::emit_module_exit (systemtap_session& s) |
46b84a80 | 3775 | { |
b20febf3 FCE |
3776 | s.op->newline() << "for (i=0; i<" << probes_by_module.size() << "; i++) {"; |
3777 | s.op->newline(1) << "struct stap_dwarf_probe *sdp = & stap_dwarf_probes[i];"; | |
3778 | s.op->newline() << "if (! sdp->registered_p) continue;"; | |
3779 | s.op->newline() << "if (sdp->return_p) {"; | |
3780 | s.op->newline(1) << "unregister_kretprobe (&sdp->u.krp);"; | |
3781 | s.op->newline() << "atomic_add (sdp->u.krp.nmissed, & skipped_count);"; | |
3782 | s.op->newline() << "atomic_add (sdp->u.krp.kp.nmissed, & skipped_count);"; | |
557fb7a8 | 3783 | s.op->newline(-1) << "} else {"; |
b20febf3 FCE |
3784 | s.op->newline(1) << "unregister_kprobe (&sdp->u.kp);"; |
3785 | s.op->newline() << "atomic_add (sdp->u.kp.nmissed, & skipped_count);"; | |
3786 | s.op->newline(-1) << "}"; | |
3787 | s.op->newline() << "sdp->registered_p = 0;"; | |
3788 | s.op->newline(-1) << "}"; | |
46b84a80 DS |
3789 | } |
3790 | ||
3791 | ||
20c6c071 | 3792 | void |
5227f1ea | 3793 | dwarf_builder::build(systemtap_session & sess, |
7a053d3b | 3794 | probe * base, |
20c6c071 GH |
3795 | probe_point * location, |
3796 | std::map<std::string, literal *> const & parameters, | |
20c6c071 GH |
3797 | vector<derived_probe *> & finished_results) |
3798 | { | |
c8959a29 GH |
3799 | dwflpp *dw = NULL; |
3800 | ||
3801 | string dummy; | |
3802 | bool has_kernel = dwarf_query::has_null_param(parameters, TOK_KERNEL); | |
3803 | bool has_module = dwarf_query::get_string_param(parameters, TOK_MODULE, dummy); | |
3804 | ||
b20febf3 FCE |
3805 | // NB: the kernel/user dwlfpp objects are long-lived. |
3806 | // XXX: but they should be per-session, as this builder object | |
3807 | // may be reused if we try to cross-instrument multiple targets. | |
c8959a29 GH |
3808 | if (has_kernel || has_module) |
3809 | { | |
3810 | if (!kern_dw) | |
3811 | { | |
3812 | kern_dw = new dwflpp(sess); | |
3813 | assert(kern_dw); | |
3814 | kern_dw->setup(true); | |
3815 | } | |
3816 | dw = kern_dw; | |
3817 | } | |
3818 | else | |
3819 | { | |
3820 | if (!user_dw) | |
3821 | { | |
3822 | user_dw = new dwflpp(sess); | |
3823 | assert(user_dw); | |
3824 | user_dw->setup(false); | |
3825 | } | |
3826 | dw = user_dw; | |
3827 | } | |
3828 | assert(dw); | |
20c6c071 | 3829 | |
c8959a29 | 3830 | dwarf_query q(sess, base, location, *dw, parameters, finished_results); |
20c6c071 | 3831 | |
20e4a32c | 3832 | if (q.has_kernel && |
54efe513 | 3833 | (q.has_function_num || q.has_inline_num || q.has_statement_num)) |
20c6c071 | 3834 | { |
50e0d793 GH |
3835 | // If we have kernel.function(0xbeef), or |
3836 | // kernel.statement(0xbeef) the address is global (relative to | |
3837 | // the kernel) and we can seek directly to the module and cudie | |
3838 | // in question. | |
54efe513 GH |
3839 | Dwarf_Addr a; |
3840 | if (q.has_function_num) | |
3841 | a = q.function_num_val; | |
3842 | else if (q.has_inline_num) | |
3843 | a = q.inline_num_val; | |
20e4a32c | 3844 | else |
54efe513 | 3845 | a = q.statement_num_val; |
c8959a29 GH |
3846 | dw->focus_on_module_containing_global_address(a); |
3847 | dw->query_cu_containing_global_address(a, &q); | |
20c6c071 | 3848 | } |
7a053d3b | 3849 | else |
20c6c071 | 3850 | { |
0ce64fb8 | 3851 | // Otherwise we have module("*bar*"), kernel.statement("foo"), or |
20c6c071 GH |
3852 | // kernel.function("foo"); in these cases we need to scan all |
3853 | // the modules. | |
7a053d3b | 3854 | assert((q.has_kernel && q.has_function_str) || |
54efe513 | 3855 | (q.has_kernel && q.has_inline_str) || |
20c6c071 GH |
3856 | (q.has_kernel && q.has_statement_str) || |
3857 | (q.has_module)); | |
0ce64fb8 | 3858 | |
c8959a29 | 3859 | dw->iterate_over_modules(&query_module, &q); |
20c6c071 | 3860 | } |
b55bc428 FCE |
3861 | } |
3862 | ||
3863 | ||
98afd80e FCE |
3864 | |
3865 | // ------------------------------------------------------------------------ | |
3866 | // timer derived probes | |
3867 | // ------------------------------------------------------------------------ | |
3868 | ||
3869 | ||
3870 | struct timer_derived_probe: public derived_probe | |
3871 | { | |
3872 | int64_t interval, randomize; | |
b20febf3 | 3873 | bool time_is_msecs; // NB: hrtimers get ms-based probes on modern kernels instead |
422d1ceb | 3874 | timer_derived_probe (probe* p, probe_point* l, int64_t i, int64_t r, bool ms=false); |
b20febf3 FCE |
3875 | virtual void join_group (systemtap_session& s); |
3876 | }; | |
98afd80e | 3877 | |
dc38c0ae | 3878 | |
b20febf3 FCE |
3879 | struct timer_derived_probe_group: public generic_dpg<timer_derived_probe> |
3880 | { | |
d006ef4f | 3881 | void emit_interval (translator_output* o); |
b20febf3 FCE |
3882 | public: |
3883 | void emit_module_decls (systemtap_session& s); | |
3884 | void emit_module_init (systemtap_session& s); | |
3885 | void emit_module_exit (systemtap_session& s); | |
98afd80e FCE |
3886 | }; |
3887 | ||
3888 | ||
422d1ceb FCE |
3889 | timer_derived_probe::timer_derived_probe (probe* p, probe_point* l, int64_t i, int64_t r, bool ms): |
3890 | derived_probe (p, l), interval (i), randomize (r), time_is_msecs(ms) | |
98afd80e FCE |
3891 | { |
3892 | if (interval <= 0 || interval > 1000000) // make i and r fit into plain ints | |
3893 | throw semantic_error ("invalid interval for jiffies timer"); | |
3894 | // randomize = 0 means no randomization | |
3895 | if (randomize < 0 || randomize > interval) | |
3896 | throw semantic_error ("invalid randomize for jiffies timer"); | |
3897 | ||
3898 | if (locations.size() != 1) | |
3899 | throw semantic_error ("expect single probe point"); | |
3900 | // so we don't have to loop over them in the other functions | |
3901 | } | |
3902 | ||
3903 | ||
dc38c0ae | 3904 | void |
b20febf3 | 3905 | timer_derived_probe::join_group (systemtap_session& s) |
dc38c0ae | 3906 | { |
b20febf3 FCE |
3907 | if (! s.timer_derived_probes) |
3908 | s.timer_derived_probes = new timer_derived_probe_group (); | |
3909 | s.timer_derived_probes->enroll (this); | |
dc38c0ae DS |
3910 | } |
3911 | ||
3912 | ||
d006ef4f JS |
3913 | void |
3914 | timer_derived_probe_group::emit_interval (translator_output* o) | |
3915 | { | |
3916 | o->line() << "({"; | |
3917 | o->newline(1) << "unsigned i = stp->intrv;"; | |
3918 | o->newline() << "if (stp->rnd != 0)"; | |
3919 | o->newline(1) << "i += _stp_random_pm(stp->rnd);"; | |
3920 | o->newline(-1) << "stp->ms ? msecs_to_jiffies(i) : i;"; | |
3921 | o->newline(-1) << "})"; | |
3922 | } | |
3923 | ||
3924 | ||
98afd80e | 3925 | void |
b20febf3 | 3926 | timer_derived_probe_group::emit_module_decls (systemtap_session& s) |
98afd80e | 3927 | { |
b20febf3 | 3928 | if (probes.empty()) return; |
46b84a80 | 3929 | |
b20febf3 | 3930 | s.op->newline() << "/* ---- timer probes ---- */"; |
46b84a80 | 3931 | |
b20febf3 FCE |
3932 | s.op->newline() << "struct stap_timer_probe {"; |
3933 | s.op->newline(1) << "struct timer_list timer_list;"; | |
3934 | s.op->newline() << "const char *pp;"; | |
3935 | s.op->newline() << "void (*ph) (struct context*);"; | |
3936 | s.op->newline() << "unsigned intrv, ms, rnd;"; | |
3937 | s.op->newline(-1) << "} stap_timer_probes [" << probes.size() << "] = {"; | |
3938 | s.op->indent(1); | |
3939 | for (unsigned i=0; i < probes.size(); i++) | |
3940 | { | |
3941 | s.op->newline () << "{"; | |
3942 | s.op->line() << " .pp=" | |
3943 | << lex_cast_qstring (*probes[i]->sole_location()) << ","; | |
3944 | s.op->line() << " .ph=&" << probes[i]->name << ","; | |
3945 | s.op->line() << " .intrv=" << probes[i]->interval << ","; | |
3946 | s.op->line() << " .ms=" << probes[i]->time_is_msecs << ","; | |
3947 | s.op->line() << " .rnd=" << probes[i]->randomize; | |
3948 | s.op->line() << " },"; | |
3949 | } | |
3950 | s.op->newline(-1) << "};"; | |
3951 | s.op->newline(); | |
98afd80e | 3952 | |
b20febf3 FCE |
3953 | s.op->newline() << "static void enter_timer_probe (unsigned long val) {"; |
3954 | s.op->newline(1) << "struct stap_timer_probe* stp = & stap_timer_probes [val];"; | |
e0d86324 JS |
3955 | s.op->newline() << "if ((atomic_read (&session_state) == STAP_SESSION_STARTING) ||"; |
3956 | s.op->newline() << " (atomic_read (&session_state) == STAP_SESSION_RUNNING))"; | |
3957 | s.op->newline(1) << "mod_timer (& stp->timer_list, jiffies + "; | |
d006ef4f JS |
3958 | emit_interval (s.op); |
3959 | s.op->line() << ");"; | |
e0d86324 JS |
3960 | s.op->newline(-1) << "{"; |
3961 | s.op->indent(1); | |
3962 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING"); | |
3963 | s.op->newline() << "c->probe_point = stp->pp;"; | |
b20febf3 FCE |
3964 | s.op->newline() << "(*stp->ph) (c);"; |
3965 | common_probe_entryfn_epilogue (s.op); | |
3966 | s.op->newline(-1) << "}"; | |
e0d86324 | 3967 | s.op->newline(-1) << "}"; |
98afd80e FCE |
3968 | } |
3969 | ||
3970 | ||
3971 | void | |
b20febf3 | 3972 | timer_derived_probe_group::emit_module_init (systemtap_session& s) |
dc38c0ae | 3973 | { |
b20febf3 | 3974 | if (probes.empty()) return; |
dc38c0ae | 3975 | |
b20febf3 FCE |
3976 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++) {"; |
3977 | s.op->newline(1) << "struct stap_timer_probe* stp = & stap_timer_probes [i];"; | |
6f313a73 | 3978 | s.op->newline() << "probe_point = stp->pp;"; |
b20febf3 FCE |
3979 | s.op->newline() << "init_timer (& stp->timer_list);"; |
3980 | s.op->newline() << "stp->timer_list.function = & enter_timer_probe;"; | |
3981 | s.op->newline() << "stp->timer_list.data = i;"; // NB: important! | |
3982 | // copy timer renew calculations from above :-( | |
d006ef4f JS |
3983 | s.op->newline() << "stp->timer_list.expires = jiffies + "; |
3984 | emit_interval (s.op); | |
3985 | s.op->line() << ";"; | |
3986 | s.op->newline() << "add_timer (& stp->timer_list);"; | |
b20febf3 FCE |
3987 | // note: no partial failure rollback is needed: add_timer cannot fail. |
3988 | s.op->newline(-1) << "}"; // for loop | |
dc38c0ae DS |
3989 | } |
3990 | ||
3991 | ||
46b84a80 | 3992 | void |
b20febf3 | 3993 | timer_derived_probe_group::emit_module_exit (systemtap_session& s) |
46b84a80 | 3994 | { |
b20febf3 | 3995 | if (probes.empty()) return; |
46b84a80 | 3996 | |
b20febf3 FCE |
3997 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++)"; |
3998 | s.op->newline(1) << "del_timer_sync (& stap_timer_probes[i].timer_list);"; | |
3999 | s.op->indent(-1); | |
46b84a80 DS |
4000 | } |
4001 | ||
4002 | ||
b20febf3 | 4003 | |
39e57ce0 FCE |
4004 | // ------------------------------------------------------------------------ |
4005 | // profile derived probes | |
4006 | // ------------------------------------------------------------------------ | |
4007 | // On kernels < 2.6.10, this uses the register_profile_notifier API to | |
4008 | // generate the timed events for profiling; on kernels >= 2.6.10 this | |
4009 | // uses the register_timer_hook API. The latter doesn't currently allow | |
4010 | // simultaneous users, so insertion will fail if the profiler is busy. | |
4011 | // (Conflicting users may include OProfile, other SystemTap probes, etc.) | |
4012 | ||
4013 | ||
4014 | struct profile_derived_probe: public derived_probe | |
4015 | { | |
6dce2125 | 4016 | profile_derived_probe (systemtap_session &s, probe* p, probe_point* l); |
b20febf3 FCE |
4017 | void join_group (systemtap_session& s); |
4018 | }; | |
39e57ce0 | 4019 | |
dc38c0ae | 4020 | |
b20febf3 FCE |
4021 | struct profile_derived_probe_group: public generic_dpg<profile_derived_probe> |
4022 | { | |
4023 | public: | |
4024 | void emit_module_decls (systemtap_session& s); | |
4025 | void emit_module_init (systemtap_session& s); | |
4026 | void emit_module_exit (systemtap_session& s); | |
39e57ce0 FCE |
4027 | }; |
4028 | ||
4029 | ||
78f6bba6 | 4030 | profile_derived_probe::profile_derived_probe (systemtap_session &, probe* p, probe_point* l): |
6dce2125 | 4031 | derived_probe(p, l) |
b20febf3 | 4032 | { |
39e57ce0 FCE |
4033 | } |
4034 | ||
4035 | ||
dc38c0ae | 4036 | void |
b20febf3 | 4037 | profile_derived_probe::join_group (systemtap_session& s) |
dc38c0ae | 4038 | { |
b20febf3 FCE |
4039 | if (! s.profile_derived_probes) |
4040 | s.profile_derived_probes = new profile_derived_probe_group (); | |
4041 | s.profile_derived_probes->enroll (this); | |
dc38c0ae DS |
4042 | } |
4043 | ||
4044 | ||
b20febf3 | 4045 | struct profile_builder: public derived_probe_builder |
39e57ce0 | 4046 | { |
b20febf3 FCE |
4047 | profile_builder() {} |
4048 | virtual void build(systemtap_session & sess, | |
4049 | probe * base, | |
4050 | probe_point * location, | |
78f6bba6 | 4051 | std::map<std::string, literal *> const &, |
b20febf3 FCE |
4052 | vector<derived_probe *> & finished_results) |
4053 | { | |
4054 | finished_results.push_back(new profile_derived_probe(sess, base, location)); | |
4055 | } | |
4056 | }; | |
46b84a80 | 4057 | |
39e57ce0 | 4058 | |
b20febf3 FCE |
4059 | // timer.profile probe handlers are hooked up in an entertaining way |
4060 | // to the underlying kernel facility. The fact that 2.6.11+ era | |
4061 | // "register_timer_hook" API allows only one consumer *system-wide* | |
4062 | // will give a hint. We will have a single entry function (and thus | |
4063 | // trivial registration / unregistration), and it will call all probe | |
4064 | // handler functions in sequence. | |
39e57ce0 | 4065 | |
6dce2125 | 4066 | void |
b20febf3 | 4067 | profile_derived_probe_group::emit_module_decls (systemtap_session& s) |
6dce2125 | 4068 | { |
b20febf3 | 4069 | if (probes.empty()) return; |
39e57ce0 | 4070 | |
b20febf3 FCE |
4071 | // kernels < 2.6.10: use register_profile_notifier API |
4072 | // kernels >= 2.6.10: use register_timer_hook API | |
4073 | s.op->newline() << "/* ---- profile probes ---- */"; | |
39e57ce0 | 4074 | |
b20febf3 FCE |
4075 | // This function calls all the profiling probe handlers in sequence. |
4076 | // The only tricky thing is that the context will be reused amongst | |
4077 | // them. While a simple sequence of calls to the individual probe | |
4078 | // handlers is unlikely to go terribly wrong (with c->last_error | |
4079 | // being set causing an early return), but for extra assurance, we | |
4080 | // open-code the same logic here. | |
39e57ce0 | 4081 | |
b20febf3 FCE |
4082 | s.op->newline() << "static void enter_all_profile_probes (struct pt_regs *regs) {"; |
4083 | s.op->indent(1); | |
4084 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING"); | |
4085 | s.op->newline() << "c->probe_point = \"timer.profile\";"; // NB: hard-coded for convenience | |
29b0069b | 4086 | s.op->newline() << "c->regs = regs;"; |
39e57ce0 | 4087 | |
b20febf3 FCE |
4088 | for (unsigned i=0; i<probes.size(); i++) |
4089 | { | |
4090 | if (i > 0) | |
4091 | { | |
4092 | // Some lightweight inter-probe context resetting | |
6f313a73 | 4093 | // XXX: not quite right: MAXERRORS not respected |
b20febf3 FCE |
4094 | s.op->newline() << "c->actioncount = 0;"; |
4095 | } | |
4096 | s.op->newline() << "if (c->last_error == NULL) " << probes[i]->name << " (c);"; | |
4097 | } | |
4098 | common_probe_entryfn_epilogue (s.op); | |
4099 | s.op->newline(-1) << "}"; | |
4100 | ||
4101 | s.op->newline() << "#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10)"; // == using_rpn of yore | |
4102 | ||
4103 | s.op->newline() << "int enter_profile_probes (struct notifier_block *self," | |
4104 | << " unsigned long val, void *data) {"; | |
4105 | s.op->newline(1) << "(void) self; (void) val;"; | |
4106 | s.op->newline() << "enter_all_profile_probes ((struct pt_regs *) data);"; | |
4107 | s.op->newline() << "return 0;"; | |
4108 | s.op->newline(-1) << "}"; | |
4109 | s.op->newline() << "struct notifier_block stap_profile_notifier = {" | |
4110 | << " .notifier_call = & enter_profile_probes };"; | |
4111 | ||
4112 | s.op->newline() << "#else"; | |
6dce2125 | 4113 | |
b20febf3 FCE |
4114 | s.op->newline() << "int enter_profile_probes (struct pt_regs *regs) {"; |
4115 | s.op->newline(1) << "enter_all_profile_probes (regs);"; | |
4116 | s.op->newline() << "return 0;"; | |
4117 | s.op->newline(-1) << "}"; | |
39e57ce0 | 4118 | |
b20febf3 | 4119 | s.op->newline() << "#endif"; |
39e57ce0 FCE |
4120 | } |
4121 | ||
4122 | ||
dc38c0ae | 4123 | void |
b20febf3 | 4124 | profile_derived_probe_group::emit_module_init (systemtap_session& s) |
dc38c0ae | 4125 | { |
b20febf3 FCE |
4126 | if (probes.empty()) return; |
4127 | ||
6f313a73 | 4128 | s.op->newline() << "probe_point = \"timer.profile\";"; // NB: hard-coded for convenience |
b20febf3 FCE |
4129 | s.op->newline() << "#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10)"; // == using_rpn of yore |
4130 | s.op->newline() << "rc = register_profile_notifier (& stap_profile_notifier);"; | |
4131 | s.op->newline() << "#else"; | |
4132 | s.op->newline() << "rc = register_timer_hook (& enter_profile_probes);"; | |
4133 | s.op->newline() << "#endif"; | |
dc38c0ae DS |
4134 | } |
4135 | ||
4136 | ||
46b84a80 | 4137 | void |
b20febf3 | 4138 | profile_derived_probe_group::emit_module_exit (systemtap_session& s) |
46b84a80 | 4139 | { |
b20febf3 | 4140 | if (probes.empty()) return; |
46b84a80 | 4141 | |
b20febf3 FCE |
4142 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++)"; |
4143 | s.op->newline(1) << "#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10)"; // == using_rpn of yore | |
4144 | s.op->newline() << "unregister_profile_notifier (& stap_profile_notifier);"; | |
4145 | s.op->newline() << "#else"; | |
4146 | s.op->newline() << "unregister_timer_hook (& enter_profile_probes);"; | |
4147 | s.op->newline() << "#endif"; | |
4148 | s.op->indent(-1); | |
46b84a80 DS |
4149 | } |
4150 | ||
4151 | ||
39e57ce0 | 4152 | |
30a279be FCE |
4153 | // ------------------------------------------------------------------------ |
4154 | // statically inserted macro-based derived probes | |
4155 | // ------------------------------------------------------------------------ | |
4156 | ||
4157 | ||
4158 | struct mark_derived_probe: public derived_probe | |
4159 | { | |
4160 | mark_derived_probe (systemtap_session &s, | |
35d4ab18 FCE |
4161 | const string& probe_name, const string& probe_sig, |
4162 | uintptr_t address, const string& module, | |
4163 | probe* base_probe); | |
30a279be | 4164 | |
35d4ab18 | 4165 | systemtap_session& sess; |
30a279be FCE |
4166 | string probe_name, probe_sig; |
4167 | uintptr_t address; | |
4168 | string module; | |
4169 | string probe_sig_expanded; | |
4170 | ||
b20febf3 | 4171 | void join_group (systemtap_session& s); |
35d4ab18 | 4172 | void emit_probe_context_vars (translator_output* o); |
30a279be FCE |
4173 | }; |
4174 | ||
4175 | ||
b20febf3 FCE |
4176 | struct mark_derived_probe_group: public generic_dpg<mark_derived_probe> |
4177 | { | |
4178 | public: | |
78f6bba6 FCE |
4179 | void emit_module_decls (systemtap_session&) {} |
4180 | void emit_module_init (systemtap_session&) {} | |
4181 | void emit_module_exit (systemtap_session&) {} | |
b20febf3 FCE |
4182 | }; |
4183 | ||
4184 | ||
35d4ab18 FCE |
4185 | struct mark_var_expanding_copy_visitor: public var_expanding_copy_visitor |
4186 | { | |
4187 | mark_var_expanding_copy_visitor(systemtap_session& s, | |
4188 | const string& ms, const string& pn): | |
4189 | sess (s), mark_signature (ms), probe_name (pn) {} | |
4190 | systemtap_session& sess; | |
4191 | string mark_signature; | |
4192 | string probe_name; | |
4193 | ||
4194 | void visit_target_symbol (target_symbol* e); | |
4195 | }; | |
4196 | ||
4197 | ||
4198 | void | |
4199 | mark_var_expanding_copy_visitor::visit_target_symbol (target_symbol* e) | |
4200 | { | |
4201 | assert(e->base_name.size() > 0 && e->base_name[0] == '$'); | |
4202 | ||
4203 | if (e->base_name.substr(0,4) != "$arg") | |
4204 | throw semantic_error ("invalid target symbol for marker, $argN expected", e->tok); | |
4205 | string argnum_s = e->base_name.substr(4,e->base_name.length()-4); | |
4206 | int argnum = atoi (argnum_s.c_str()); | |
4207 | if (argnum < 1 || argnum > (int) mark_signature.size()) | |
4208 | throw semantic_error ("invalid marker argument number", e->tok); | |
4209 | ||
4210 | char argtype = mark_signature[argnum-1]; | |
4211 | ||
4212 | // Synthesize a function. | |
4213 | functiondecl *fdecl = new functiondecl; | |
4214 | fdecl->tok = e->tok; | |
4215 | embeddedcode *ec = new embeddedcode; | |
4216 | ec->tok = e->tok; | |
35d4ab18 | 4217 | |
1b07c728 FCE |
4218 | if (is_active_lvalue (e)) |
4219 | throw semantic_error("write to marker parameter not permitted", e->tok); | |
35d4ab18 | 4220 | |
1b07c728 FCE |
4221 | string fname = string("_mark_tvar_get") |
4222 | + "_" + e->base_name.substr(1) | |
4223 | + "_" + lex_cast<string>(tick++); | |
35d4ab18 | 4224 | |
1b07c728 FCE |
4225 | ec->code = string("THIS->__retvalue = CONTEXT->locals[0].") |
4226 | + probe_name + string(".__mark_arg") | |
4227 | + lex_cast<string>(argnum) + string (";"); | |
4228 | ec->code += "/* pure */"; | |
35d4ab18 FCE |
4229 | fdecl->name = fname; |
4230 | fdecl->body = ec; | |
4231 | fdecl->type = (argtype == 'N' ? pe_long : | |
4232 | argtype == 'S' ? pe_string : | |
4233 | pe_unknown); // cannot happen | |
4234 | sess.functions.push_back(fdecl); | |
4235 | ||
4236 | // Synthesize a functioncall. | |
4237 | functioncall* n = new functioncall; | |
4238 | n->tok = e->tok; | |
4239 | n->function = fname; | |
4240 | n->referent = 0; // NB: must not resolve yet, to ensure inclusion in session | |
4241 | provide <functioncall*> (this, n); | |
4242 | } | |
4243 | ||
4244 | ||
4245 | ||
30a279be | 4246 | mark_derived_probe::mark_derived_probe (systemtap_session &s, |
35d4ab18 FCE |
4247 | const string& p_n, |
4248 | const string& p_s, | |
4249 | uintptr_t a, | |
4250 | const string& m, | |
4251 | probe* base): | |
4252 | derived_probe (base, 0), sess (s), probe_name (p_n), probe_sig (p_s), | |
30a279be FCE |
4253 | address (a), module (m) |
4254 | { | |
4255 | // create synthetic probe point | |
4256 | probe_point* pp = new probe_point; | |
4257 | ||
4258 | probe_point::component* c; | |
4259 | if (module == "") c = new probe_point::component ("kernel"); | |
4260 | else c = new probe_point::component ("module", | |
4261 | new literal_string (module)); | |
4262 | pp->components.push_back (c); | |
dc223023 | 4263 | c = new probe_point::component ("mark", |
30a279be FCE |
4264 | new literal_string (probe_name)); |
4265 | pp->components.push_back (c); | |
4266 | this->locations.push_back (pp); | |
4267 | ||
4268 | // expand the signature string | |
4269 | for (unsigned i=0; i<probe_sig.length(); i++) | |
4270 | { | |
4271 | if (i > 0) | |
4272 | probe_sig_expanded += ", "; | |
e38d6504 | 4273 | switch (probe_sig[i]) |
30a279be FCE |
4274 | { |
4275 | case 'N': probe_sig_expanded += "int64_t"; break; | |
4276 | case 'S': probe_sig_expanded += "const char *"; break; | |
e38d6504 | 4277 | default: |
30a279be FCE |
4278 | throw semantic_error ("unsupported probe signature " + probe_sig, |
4279 | this->tok); | |
4280 | } | |
e38d6504 | 4281 | probe_sig_expanded += " arg" + lex_cast<string>(i+1); // arg1 ... |
30a279be | 4282 | } |
35d4ab18 FCE |
4283 | |
4284 | // Now make a local-variable-expanded copy of the probe body | |
4285 | mark_var_expanding_copy_visitor v (sess, probe_sig, name); | |
4286 | require <block*> (&v, &(this->body), base->body); | |
4287 | ||
4288 | if (sess.verbose > 1) | |
4289 | clog << "marker-based " << name << " address=0x" << hex << address << dec | |
4290 | << " signature=" << probe_sig << endl; | |
30a279be FCE |
4291 | } |
4292 | ||
4293 | ||
dc38c0ae | 4294 | void |
b20febf3 | 4295 | mark_derived_probe::join_group (systemtap_session& s) |
dc38c0ae | 4296 | { |
b20febf3 FCE |
4297 | throw semantic_error ("incomplete", this->tok); |
4298 | ||
4299 | if (! s.mark_derived_probes) | |
4300 | s.mark_derived_probes = new mark_derived_probe_group (); | |
4301 | s.mark_derived_probes->enroll (this); | |
dc38c0ae DS |
4302 | } |
4303 | ||
4304 | ||
30a279be | 4305 | void |
35d4ab18 FCE |
4306 | mark_derived_probe::emit_probe_context_vars (translator_output* o) |
4307 | { | |
4308 | // Save incoming arguments | |
4309 | for (unsigned i=0; i<probe_sig.length(); i++) | |
4310 | { | |
4311 | string localname = "__mark_arg" + lex_cast<string>(i+1); | |
e38d6504 | 4312 | switch (probe_sig[i]) |
35d4ab18 FCE |
4313 | { |
4314 | case 'S': o->newline() << "string_t " << localname << ";"; break; | |
4315 | case 'N': o->newline() << "int64_t " << localname << ";"; break; | |
4316 | } | |
4317 | } | |
4318 | } | |
4319 | ||
4320 | ||
b20febf3 | 4321 | #if 0 |
35d4ab18 FCE |
4322 | void |
4323 | mark_derived_probe::emit_probe_entries (translator_output* o) | |
30a279be FCE |
4324 | { |
4325 | assert (this->locations.size() == 1); | |
4326 | ||
ffd1346f | 4327 | o->newline() << "static void enter_" << name << " (" << probe_sig_expanded << ")"; |
30a279be FCE |
4328 | o->newline() << "{"; |
4329 | o->newline(1) << "const char* probe_point = " | |
4330 | << lex_cast_qstring(* this->locations[0]) << ";"; | |
4331 | emit_probe_prologue (o, "STAP_SESSION_RUNNING"); | |
4332 | ||
35d4ab18 FCE |
4333 | // Save incoming arguments |
4334 | for (unsigned k=0; k<probe_sig.length(); k++) | |
4335 | { | |
4336 | string locals = "c->locals[0]." + name; | |
4337 | string localname = locals + ".__mark_arg" + lex_cast<string>(k+1); | |
4338 | string argname = "arg" + lex_cast<string>(k+1); | |
e38d6504 | 4339 | switch (probe_sig[k]) |
35d4ab18 FCE |
4340 | { |
4341 | case 'S': o->newline() << "strlcpy (" << localname << ", " << argname | |
4342 | << ", MAXSTRINGLEN);"; break; | |
e38d6504 | 4343 | // XXX: dupe with c_unparser::c_strcpy |
35d4ab18 FCE |
4344 | case 'N': o->newline() << localname << " = " << argname << ";"; break; |
4345 | } | |
4346 | } | |
30a279be FCE |
4347 | |
4348 | // NB: locals are initialized by probe function itself | |
35d4ab18 | 4349 | o->newline() << name << " (c);"; |
30a279be FCE |
4350 | |
4351 | emit_probe_epilogue (o); | |
4352 | o->newline(-1) << "}"; | |
4353 | } | |
4354 | ||
4355 | ||
4356 | void | |
46b84a80 DS |
4357 | mark_derived_probe::emit_registrations_start (translator_output* o, |
4358 | unsigned index) | |
30a279be FCE |
4359 | { |
4360 | assert (this->locations.size() == 1); | |
4361 | ||
4362 | o->newline() << "{"; | |
4363 | o->newline(1) << "void (**fn) (" << probe_sig_expanded << ") = (void *)" | |
4364 | << address << "UL;"; | |
4365 | ||
4a5e8a70 FCE |
4366 | o->newline() << "#if __HAVE_ARCH_CMPXCHG"; |
4367 | o->newline() << "unsigned long *fnpp = (unsigned long *) (void *) fn;"; | |
35d4ab18 | 4368 | o->newline() << "unsigned long fnp = (unsigned long) (void *) & enter_" << name << ";"; |
4a5e8a70 FCE |
4369 | o->newline() << "unsigned long oldval = cmpxchg (fnpp, 0, fnp);"; |
4370 | o->newline() << "if (oldval != 0) rc = 1;"; // XXX: could retry a few times | |
4371 | o->newline() << "#else"; | |
dc223023 | 4372 | // XXX: need proper synchronization for concurrent registration attempts |
35d4ab18 | 4373 | o->newline() << "if (*fn == 0) *fn = & enter_" << name << ";"; |
4a5e8a70 | 4374 | o->newline() << "#endif"; |
30a279be | 4375 | o->newline() << "mb ();"; |
35d4ab18 | 4376 | o->newline() << "if (*fn != & enter_" << name << ") rc = 1;"; |
30a279be FCE |
4377 | |
4378 | o->newline(-1) << "}"; | |
e38d6504 | 4379 | |
46b84a80 DS |
4380 | |
4381 | // if one failed, must goto code (output by emit_registrations_end) | |
4382 | // that will roll back completed registations for this probe | |
4383 | o->newline() << "if (unlikely (rc)) {"; | |
4384 | o->newline(1) << "probe_point = " | |
4385 | << lex_cast_qstring (*this->locations[0]) << ";"; | |
4386 | if (index == 0) | |
4387 | o->newline() << "goto mark_error;"; | |
4388 | else | |
4389 | o->newline() << "goto unwind_mark_" << index - 1 << ";"; | |
4390 | o->newline(-1) << "}"; | |
4391 | } | |
4392 | ||
4393 | ||
4394 | void | |
4395 | mark_derived_probe::emit_registrations_end (translator_output* o, | |
4396 | unsigned index) | |
4397 | { | |
4398 | // if one failed, must roll back completed registations for this probe | |
4399 | o->newline(-1) << "unwind_mark_" << index << ":"; | |
4400 | o->indent(1); | |
4401 | emit_deregistrations (o); | |
30a279be FCE |
4402 | } |
4403 | ||
35d4ab18 | 4404 | |
30a279be | 4405 | void |
35d4ab18 | 4406 | mark_derived_probe::emit_deregistrations (translator_output * o) |
30a279be FCE |
4407 | { |
4408 | assert (this->locations.size() == 1); | |
4409 | ||
4410 | o->newline() << "{"; | |
4411 | o->newline(1) << "void (**fn) (" << probe_sig_expanded << ") = (void *)" | |
4412 | << address << "UL;"; | |
4a5e8a70 FCE |
4413 | o->newline() << "#if __HAVE_ARCH_CMPXCHG"; |
4414 | o->newline() << "unsigned long *fnpp = (unsigned long *) (void *) fn;"; | |
35d4ab18 | 4415 | o->newline() << "unsigned long fnp = (unsigned long) (void *) & enter_" << name << ";"; |
4a5e8a70 FCE |
4416 | o->newline() << "unsigned long oldval = cmpxchg (fnpp, fnp, 0);"; |
4417 | o->newline() << "if (oldval != fnp) ;"; // XXX: should not happen | |
4418 | o->newline() << "#else"; | |
30a279be | 4419 | o->newline(0) << "*fn = 0;"; |
4a5e8a70 | 4420 | o->newline() << "#endif"; |
30a279be FCE |
4421 | o->newline(-1) << "}"; |
4422 | } | |
b20febf3 | 4423 | #endif |
30a279be FCE |
4424 | |
4425 | ||
b20febf3 | 4426 | #if 0 |
dc38c0ae DS |
4427 | void |
4428 | mark_derived_probe_group::emit_probes (translator_output* op, unparser* up) | |
4429 | { | |
4430 | for (unsigned i=0; i < probes.size(); i++) | |
4431 | { | |
4432 | op->newline (); | |
4433 | up->emit_probe (probes[i]); | |
4434 | } | |
4435 | } | |
4436 | ||
30a279be | 4437 | |
46b84a80 DS |
4438 | void |
4439 | mark_derived_probe_group::emit_module_init (translator_output* o) | |
4440 | { | |
4441 | if (probes.size () == 0) | |
4442 | return; | |
4443 | ||
4444 | // Output the mark probes create function | |
4445 | o->newline() << "static int register_mark_probes (void) {"; | |
4446 | o->indent(1); | |
4447 | o->newline() << "int rc = 0;"; | |
4448 | o->newline() << "const char *probe_point;"; | |
4449 | ||
4450 | for (unsigned i=0; i < probes.size (); i++) | |
4451 | probes[i]->emit_registrations_start (o, i); | |
4452 | ||
4453 | o->newline() << "goto out;"; | |
4454 | o->newline(); | |
4455 | ||
4456 | for (int i=probes.size() - 2; i >= 0; i--) | |
4457 | probes[i]->emit_registrations_end (o, i); | |
4458 | ||
4459 | o->newline(); | |
4460 | ||
4461 | o->newline(-1) << "mark_error:"; | |
4462 | o->newline(1) << "if (unlikely (rc)) {"; | |
4463 | // In case it's just a lower-layer (kprobes) error that set rc but | |
4464 | // not session_state, do that here to prevent any other BEGIN probe | |
4465 | // from attempting to run. | |
4466 | o->newline(1) << "atomic_set (&session_state, STAP_SESSION_ERROR);"; | |
4467 | o->newline() << "_stp_error (\"mark probe %s registration failed, rc=%d\\n\", probe_point, rc);"; | |
4468 | o->newline(-1) << "}\n"; | |
4469 | ||
4470 | o->newline(-1) << "out:"; | |
4471 | o->newline(1) << "return rc;"; | |
4472 | o->newline(-1) << "}\n"; | |
4473 | ||
4474 | // Output the mark probes destroy function | |
4475 | o->newline() << "static void unregister_mark_probes (void) {"; | |
4476 | o->indent(1); | |
4477 | ||
4478 | for (unsigned i=0; i < probes.size (); i++) | |
4479 | { | |
4480 | probes[i]->emit_deregistrations (o); | |
4481 | emit_probe_timing(probes[i], o); | |
4482 | } | |
4483 | ||
4484 | o->newline(-1) << "}\n"; | |
4485 | } | |
b20febf3 | 4486 | #endif |
46b84a80 DS |
4487 | |
4488 | ||
30a279be FCE |
4489 | struct symboltable_extract |
4490 | { | |
4491 | uintptr_t address; | |
4492 | string symbol; | |
4493 | string module; | |
4494 | }; | |
4495 | ||
4496 | ||
4497 | #define PROBE_SYMBOL_PREFIX "__systemtap_mark_" | |
4498 | ||
4499 | ||
4500 | struct mark_builder: public derived_probe_builder | |
4501 | { | |
4502 | private: | |
4503 | static const vector<symboltable_extract>* get_symbols (systemtap_session&); | |
4504 | ||
4505 | public: | |
4506 | mark_builder() {} | |
4507 | void build(systemtap_session & sess, | |
4508 | probe * base, | |
4509 | probe_point * location, | |
4510 | std::map<std::string, literal *> const & parameters, | |
4511 | vector<derived_probe *> & finished_results); | |
4512 | }; | |
4513 | ||
4514 | ||
4515 | // Until elfutils makes this straightforward, we kludge. | |
4516 | // See also translate.cxx:emit_symbol_data(). | |
4517 | ||
4518 | const vector<symboltable_extract>* | |
4519 | mark_builder::get_symbols (systemtap_session& sess) | |
4520 | { | |
4521 | static vector<symboltable_extract>* syms = 0; | |
4522 | if (syms) return syms; // already computed | |
4523 | ||
4524 | syms = new vector<symboltable_extract>; | |
4525 | ||
4526 | // Process /proc/kallsyms - contains reliable module symbols | |
4527 | ifstream kallsyms ("/proc/kallsyms"); | |
4528 | while (! kallsyms.eof()) | |
4529 | { | |
4530 | string addr, type, sym, module; | |
4531 | kallsyms >> addr >> type >> sym; | |
4532 | kallsyms >> ws; | |
4533 | if (kallsyms.peek() == '[') | |
4534 | { | |
4535 | string bracketed; | |
4536 | kallsyms >> bracketed; | |
4537 | module = bracketed.substr (1, bracketed.length()-2); | |
4538 | } | |
4539 | else // kernel symbols come from /boot/System.map* | |
4540 | continue; | |
4541 | ||
4542 | if (type == "b" || type == "d") // static data/bss | |
4543 | { | |
4544 | symboltable_extract e; | |
4545 | e.address = strtoul (addr.c_str(), 0, 16); | |
4546 | e.symbol = sym; | |
4547 | e.module = module; | |
4548 | syms->push_back (e); | |
4549 | } | |
4550 | } | |
4551 | kallsyms.close (); | |
4552 | ||
4553 | // grab them kernel symbols | |
4554 | string smname = "/boot/System.map-"; | |
4555 | smname += sess.kernel_release; | |
4556 | ifstream systemmap (smname.c_str()); | |
4557 | while (! systemmap.eof()) | |
4558 | { | |
4559 | string addr, type, sym, module; | |
4560 | systemmap >> addr >> type >> sym; | |
4561 | module = ""; | |
4562 | ||
4563 | if (type == "b" || type == "d") // static data/bss | |
4564 | { | |
4565 | symboltable_extract e; | |
4566 | e.address = strtoul (addr.c_str(), 0, 16); | |
4567 | e.symbol = sym; | |
4568 | e.module = module; | |
4569 | syms->push_back (e); | |
4570 | } | |
4571 | } | |
4572 | systemmap.close (); | |
4573 | ||
4574 | return syms; | |
4575 | } | |
4576 | ||
4577 | ||
4578 | void | |
4579 | mark_builder::build(systemtap_session & sess, | |
4580 | probe * base, | |
4581 | probe_point * location, | |
4582 | std::map<std::string, literal *> const & parameters, | |
4583 | vector<derived_probe *> & finished_results) | |
4584 | { | |
4585 | const vector<symboltable_extract>* syms = get_symbols (sess); | |
4586 | ||
4587 | string param_module; | |
4588 | bool has_module = get_param (parameters, "module", param_module); | |
4589 | bool has_kernel = (parameters.find("kernel") != parameters.end()); | |
4590 | ||
4591 | if (! (has_module ^ has_kernel)) | |
35d4ab18 | 4592 | throw semantic_error ("need kernel or module() component", location->tok); |
30a279be FCE |
4593 | |
4594 | string param_probe; | |
4595 | bool has_probe = get_param (parameters, "mark", param_probe); | |
4596 | if (! has_probe) | |
4597 | throw semantic_error ("need mark() component", location->tok); | |
4598 | ||
4599 | string symbol_regex = PROBE_SYMBOL_PREFIX "([a-zA-Z0-9_]+)_([NS]*)\\.[0-9]+"; | |
4600 | // ^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^ ^^^^^ ^^^^^^ | |
4601 | // common prefix probe name types suffix | |
4602 | regex_t symbol_regex_t; | |
4603 | int rc = regcomp (& symbol_regex_t, symbol_regex.c_str(), REG_EXTENDED); | |
4604 | if (rc) | |
4605 | throw semantic_error ("regcomp '" + symbol_regex + "' failed"); | |
4606 | ||
4607 | // cout << "searching for " << symbol_regex << endl; | |
4608 | ||
4609 | for (unsigned i=0; i<syms->size(); i++) | |
4610 | { | |
4611 | regmatch_t match[3]; | |
4612 | const symboltable_extract& ext = syms->at(i); | |
4613 | const char* symstr = ext.symbol.c_str(); | |
4614 | ||
4615 | rc = regexec (& symbol_regex_t, symstr, 3, match, 0); | |
4616 | if (! rc) // match | |
4617 | { | |
4618 | #if 0 | |
4619 | cout << "match in " << symstr << ":" | |
4620 | << "[" << match[0].rm_so << "-" << match[0].rm_eo << "]," | |
4621 | << "[" << match[1].rm_so << "-" << match[1].rm_eo << "]," | |
4622 | << "[" << match[2].rm_so << "-" << match[2].rm_eo << "]" | |
4623 | << endl; | |
4624 | #endif | |
4625 | ||
4626 | string probe_name = string (symstr + match[1].rm_so, | |
4627 | (match[1].rm_eo - match[1].rm_so)); | |
4628 | string probe_sig = string (symstr + match[2].rm_so, | |
4629 | (match[2].rm_eo - match[2].rm_so)); | |
4630 | ||
4631 | // Below, "rc" has negative polarity: zero iff matching | |
e38d6504 | 4632 | rc = (has_module |
30a279be FCE |
4633 | ? fnmatch (param_module.c_str(), ext.module.c_str(), 0) |
4634 | : (ext.module != "")); // kernel.* | |
4635 | rc |= fnmatch (param_probe.c_str(), probe_name.c_str(), 0); | |
e38d6504 | 4636 | |
30a279be FCE |
4637 | if (! rc) |
4638 | { | |
4639 | // cout << "match (" << probe_name << "):" << probe_sig << endl; | |
4640 | ||
e38d6504 | 4641 | derived_probe *dp |
30a279be FCE |
4642 | = new mark_derived_probe (sess, |
4643 | probe_name, probe_sig, | |
4644 | ext.address, | |
4645 | ext.module, | |
4646 | base); | |
4647 | finished_results.push_back (dp); | |
4648 | } | |
4649 | } | |
4650 | } | |
4651 | ||
4652 | // cout << "done" << endl; | |
4653 | ||
4654 | // It's not a big deal if this is skipped due to an exception. | |
4655 | regfree (& symbol_regex_t); | |
4656 | } | |
4657 | ||
4658 | ||
56894e91 JS |
4659 | // ------------------------------------------------------------------------ |
4660 | // hrtimer derived probes | |
4661 | // ------------------------------------------------------------------------ | |
4662 | // This is a new timer interface that provides more flexibility in specifying | |
4663 | // intervals, and uses the hrtimer APIs when available for greater precision. | |
39014506 JS |
4664 | // While hrtimers were added in 2.6.16, the API's weren't exported until |
4665 | // 2.6.17, so we must check this kernel version before attempting to use | |
4666 | // hrtimers. | |
56894e91 | 4667 | // |
56894e91 | 4668 | // * hrtimer_derived_probe: creates a probe point based on the hrtimer APIs. |
56894e91 JS |
4669 | |
4670 | ||
4671 | struct hrtimer_derived_probe: public derived_probe | |
4672 | { | |
4673 | // set a (generous) maximum of one day in ns | |
4674 | static const int64_t max_ns_interval = 1000000000LL * 60LL * 60LL * 24LL; | |
4675 | ||
4676 | // 100us seems like a reasonable minimum | |
4677 | static const int64_t min_ns_interval = 100000LL; | |
4678 | ||
4679 | int64_t interval, randomize; | |
4680 | ||
4681 | hrtimer_derived_probe (probe* p, probe_point* l, int64_t i, int64_t r): | |
4682 | derived_probe (p, l), interval (i), randomize (r) | |
4683 | { | |
4684 | if ((i < min_ns_interval) || (i > max_ns_interval)) | |
4685 | throw semantic_error("interval value out of range"); | |
4686 | ||
4687 | // randomize = 0 means no randomization | |
4688 | if ((r < 0) || (r > i)) | |
4689 | throw semantic_error("randomization value out of range"); | |
56894e91 JS |
4690 | } |
4691 | ||
b20febf3 FCE |
4692 | void join_group (systemtap_session& s); |
4693 | }; | |
dc38c0ae | 4694 | |
56894e91 | 4695 | |
b20febf3 FCE |
4696 | struct hrtimer_derived_probe_group: public generic_dpg<hrtimer_derived_probe> |
4697 | { | |
4698 | void emit_interval (translator_output* o); | |
4699 | public: | |
4700 | void emit_module_decls (systemtap_session& s); | |
4701 | void emit_module_init (systemtap_session& s); | |
4702 | void emit_module_exit (systemtap_session& s); | |
56894e91 JS |
4703 | }; |
4704 | ||
4705 | ||
dc38c0ae | 4706 | void |
b20febf3 | 4707 | hrtimer_derived_probe::join_group (systemtap_session& s) |
dc38c0ae | 4708 | { |
b20febf3 FCE |
4709 | if (! s.hrtimer_derived_probes) |
4710 | s.hrtimer_derived_probes = new hrtimer_derived_probe_group (); | |
4711 | s.hrtimer_derived_probes->enroll (this); | |
dc38c0ae DS |
4712 | } |
4713 | ||
4714 | ||
56894e91 | 4715 | void |
b20febf3 | 4716 | hrtimer_derived_probe_group::emit_interval (translator_output* o) |
56894e91 JS |
4717 | { |
4718 | o->line() << "({"; | |
ffb0b3ad | 4719 | o->newline(1) << "unsigned long nsecs;"; |
b20febf3 FCE |
4720 | o->newline() << "int64_t i = stp->intrv;"; |
4721 | o->newline() << "if (stp->rnd != 0) {"; | |
4722 | // XXX: why not use stp_random_pm instead of this? | |
4723 | o->newline(1) << "int64_t r;"; | |
4724 | o->newline() << "get_random_bytes(&r, sizeof(r));"; | |
4725 | // ensure that r is positive | |
4726 | o->newline() << "r &= ((uint64_t)1 << (8*sizeof(r) - 1)) - 1;"; | |
4727 | o->newline() << "r = _stp_mod64(NULL, r, (2*stp->rnd+1));"; | |
4728 | o->newline() << "r -= stp->rnd;"; | |
4729 | o->newline() << "i += r;"; | |
4730 | o->newline(-1) << "}"; | |
4731 | o->newline() << "if (unlikely(i < stap_hrtimer_resolution))"; | |
4732 | o->newline(1) << "i = stap_hrtimer_resolution;"; | |
197a4d62 | 4733 | o->indent(-1); |
ffb0b3ad JS |
4734 | o->newline() << "nsecs = do_div(i, NSEC_PER_SEC);"; |
4735 | o->newline() << "ktime_set(i, nsecs);"; | |
56894e91 JS |
4736 | o->newline(-1) << "})"; |
4737 | } | |
4738 | ||
4739 | ||
4740 | void | |
b20febf3 | 4741 | hrtimer_derived_probe_group::emit_module_decls (systemtap_session& s) |
46b84a80 | 4742 | { |
b20febf3 | 4743 | if (probes.empty()) return; |
46b84a80 | 4744 | |
b20febf3 | 4745 | s.op->newline() << "/* ---- hrtimer probes ---- */"; |
46b84a80 | 4746 | |
b20febf3 FCE |
4747 | s.op->newline() << "unsigned long stap_hrtimer_resolution;"; // init later |
4748 | s.op->newline() << "struct stap_hrtimer_probe {"; | |
4749 | s.op->newline(1) << "struct hrtimer hrtimer;"; | |
4750 | s.op->newline() << "const char *pp;"; | |
4751 | s.op->newline() << "void (*ph) (struct context*);"; | |
4752 | s.op->newline() << "int64_t intrv, rnd;"; | |
4753 | s.op->newline(-1) << "} stap_hrtimer_probes [" << probes.size() << "] = {"; | |
4754 | s.op->indent(1); | |
4755 | for (unsigned i=0; i < probes.size(); i++) | |
4756 | { | |
4757 | s.op->newline () << "{"; | |
4758 | s.op->line() << " .pp=" << lex_cast_qstring (*probes[i]->sole_location()) << ","; | |
4759 | s.op->line() << " .ph=&" << probes[i]->name << ","; | |
4760 | s.op->line() << " .intrv=" << probes[i]->interval << "LL,"; | |
4761 | s.op->line() << " .rnd=" << probes[i]->randomize << "LL"; | |
4762 | s.op->line() << " },"; | |
4763 | } | |
4764 | s.op->newline(-1) << "};"; | |
4765 | s.op->newline(); | |
4766 | ||
5dbd55d7 JS |
4767 | // The function signature changed in 2.6.21. |
4768 | if (strverscmp(s.kernel_base_release.c_str(), "2.6.21") < 0) | |
4769 | s.op->newline() << "static int "; | |
4770 | else | |
4771 | s.op->newline() << "static enum hrtimer_restart "; | |
4772 | s.op->line() << "enter_hrtimer_probe (struct hrtimer *timer) {"; | |
4773 | ||
e0d86324 JS |
4774 | s.op->newline(1) << "int rc = HRTIMER_NORESTART;"; |
4775 | s.op->newline() << "struct stap_hrtimer_probe *stp = container_of(timer, struct stap_hrtimer_probe, hrtimer);"; | |
4776 | s.op->newline() << "if ((atomic_read (&session_state) == STAP_SESSION_STARTING) ||"; | |
4777 | s.op->newline() << " (atomic_read (&session_state) == STAP_SESSION_RUNNING)) {"; | |
b20febf3 | 4778 | // Compute next trigger time |
e0d86324 | 4779 | s.op->newline(1) << "timer->expires = ktime_add (timer->expires,"; |
b20febf3 FCE |
4780 | emit_interval (s.op); |
4781 | s.op->line() << ");"; | |
e0d86324 JS |
4782 | s.op->newline() << "rc = HRTIMER_RESTART;"; |
4783 | s.op->newline(-1) << "}"; | |
4784 | s.op->newline() << "{"; | |
4785 | s.op->indent(1); | |
4786 | common_probe_entryfn_prologue (s.op, "STAP_SESSION_RUNNING"); | |
4787 | s.op->newline() << "c->probe_point = stp->pp;"; | |
b20febf3 FCE |
4788 | s.op->newline() << "(*stp->ph) (c);"; |
4789 | common_probe_entryfn_epilogue (s.op); | |
e0d86324 JS |
4790 | s.op->newline(-1) << "}"; |
4791 | s.op->newline() << "return rc;"; | |
b20febf3 | 4792 | s.op->newline(-1) << "}"; |
56894e91 JS |
4793 | } |
4794 | ||
4795 | ||
4796 | void | |
b20febf3 | 4797 | hrtimer_derived_probe_group::emit_module_init (systemtap_session& s) |
56894e91 | 4798 | { |
5dbd55d7 | 4799 | const char *rel; |
b20febf3 | 4800 | if (probes.empty()) return; |
56894e91 | 4801 | |
5dbd55d7 JS |
4802 | // The enumeration names changed in 2.6.21. |
4803 | if (strverscmp(s.kernel_base_release.c_str(), "2.6.21") < 0) | |
4804 | rel = "HRTIMER_REL"; | |
4805 | else | |
4806 | rel = "HRTIMER_MODE_REL"; | |
4807 | ||
b20febf3 FCE |
4808 | s.op->newline() << "{"; |
4809 | s.op->newline(1) << "struct timespec res;"; | |
4810 | s.op->newline() << "hrtimer_get_res (CLOCK_MONOTONIC, &res);"; | |
4811 | s.op->newline() << "stap_hrtimer_resolution = timespec_to_ns (&res);"; | |
4812 | s.op->newline(-1) << "}"; | |
a68f81a2 | 4813 | |
b20febf3 FCE |
4814 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++) {"; |
4815 | s.op->newline(1) << "struct stap_hrtimer_probe* stp = & stap_hrtimer_probes [i];"; | |
6f313a73 | 4816 | s.op->newline() << "probe_point = stp->pp;"; |
5dbd55d7 | 4817 | s.op->newline() << "hrtimer_init (& stp->hrtimer, CLOCK_MONOTONIC, " << rel << ");"; |
b20febf3 FCE |
4818 | s.op->newline() << "stp->hrtimer.function = & enter_hrtimer_probe;"; |
4819 | // There is no hrtimer field to identify *this* (i-th) probe handler | |
4820 | // callback. So instead we'll deduce it at entry time. | |
4821 | s.op->newline() << "(void) hrtimer_start (& stp->hrtimer, "; | |
4822 | emit_interval (s.op); | |
5dbd55d7 | 4823 | s.op->line() << ", " << rel << ");"; |
b20febf3 FCE |
4824 | // Note: no partial failure rollback is needed: hrtimer_start only |
4825 | // "fails" if the timer was already active, which cannot be. | |
4826 | s.op->newline(-1) << "}"; // for loop | |
56894e91 JS |
4827 | } |
4828 | ||
4829 | ||
dc38c0ae | 4830 | void |
b20febf3 | 4831 | hrtimer_derived_probe_group::emit_module_exit (systemtap_session& s) |
dc38c0ae | 4832 | { |
b20febf3 | 4833 | if (probes.empty()) return; |
197a4d62 | 4834 | |
b20febf3 FCE |
4835 | s.op->newline() << "for (i=0; i<" << probes.size() << "; i++)"; |
4836 | s.op->newline(1) << "hrtimer_cancel (& stap_hrtimer_probes[i].hrtimer);"; | |
4837 | s.op->indent(-1); | |
dc38c0ae DS |
4838 | } |
4839 | ||
4840 | ||
56894e91 | 4841 | |
197a4d62 JS |
4842 | struct timer_builder: public derived_probe_builder |
4843 | { | |
4844 | virtual void build(systemtap_session & sess, | |
4845 | probe * base, probe_point * location, | |
4846 | std::map<std::string, literal *> const & parameters, | |
4847 | vector<derived_probe *> & finished_results); | |
e38d6504 | 4848 | |
197a4d62 | 4849 | static void register_patterns(match_node *root); |
56894e91 JS |
4850 | }; |
4851 | ||
197a4d62 JS |
4852 | void |
4853 | timer_builder::build(systemtap_session & sess, | |
4854 | probe * base, | |
4855 | probe_point * location, | |
4856 | std::map<std::string, literal *> const & parameters, | |
4857 | vector<derived_probe *> & finished_results) | |
56894e91 | 4858 | { |
197a4d62 | 4859 | int64_t period, rand=0; |
56894e91 | 4860 | |
197a4d62 JS |
4861 | if (!get_param(parameters, "randomize", rand)) |
4862 | rand = 0; | |
56894e91 | 4863 | |
197a4d62 | 4864 | if (get_param(parameters, "jiffies", period)) |
56894e91 | 4865 | { |
197a4d62 JS |
4866 | // always use basic timers for jiffies |
4867 | finished_results.push_back( | |
4868 | new timer_derived_probe(base, location, period, rand, false)); | |
4869 | return; | |
56894e91 | 4870 | } |
197a4d62 | 4871 | else if (get_param(parameters, "hz", period)) |
56894e91 | 4872 | { |
197a4d62 JS |
4873 | if (period <= 0) |
4874 | throw semantic_error ("frequency must be greater than 0"); | |
4875 | period = (1000000000 + period - 1)/period; | |
4876 | } | |
4877 | else if (get_param(parameters, "s", period) | |
4878 | || get_param(parameters, "sec", period)) | |
4879 | { | |
4880 | period *= 1000000000; | |
4881 | rand *= 1000000000; | |
4882 | } | |
4883 | else if (get_param(parameters, "ms", period) | |
4884 | || get_param(parameters, "msec", period)) | |
4885 | { | |
4886 | period *= 1000000; | |
4887 | rand *= 1000000; | |
4888 | } | |
4889 | else if (get_param(parameters, "us", period) | |
4890 | || get_param(parameters, "usec", period)) | |
4891 | { | |
4892 | period *= 1000; | |
4893 | rand *= 1000; | |
4894 | } | |
4895 | else if (get_param(parameters, "ns", period) | |
4896 | || get_param(parameters, "nsec", period)) | |
4897 | { | |
4898 | // ok | |
4899 | } | |
4900 | else | |
4901 | throw semantic_error ("unrecognized timer variant"); | |
56894e91 | 4902 | |
b20febf3 FCE |
4903 | // Redirect wallclock-time based probes to hrtimer code on recent |
4904 | // enough kernels. | |
197a4d62 JS |
4905 | if (strverscmp(sess.kernel_base_release.c_str(), "2.6.17") < 0) |
4906 | { | |
4907 | // hrtimers didn't exist, so use the old-school timers | |
4908 | period = (period + 1000000 - 1)/1000000; | |
4909 | rand = (rand + 1000000 - 1)/1000000; | |
56894e91 | 4910 | |
197a4d62 JS |
4911 | finished_results.push_back( |
4912 | new timer_derived_probe(base, location, period, rand, true)); | |
4913 | } | |
4914 | else | |
4915 | finished_results.push_back( | |
4916 | new hrtimer_derived_probe(base, location, period, rand)); | |
4917 | } | |
56894e91 | 4918 | |
197a4d62 JS |
4919 | void |
4920 | timer_builder::register_patterns(match_node *root) | |
4921 | { | |
4922 | derived_probe_builder *builder = new timer_builder(); | |
56894e91 | 4923 | |
197a4d62 | 4924 | root = root->bind("timer"); |
56894e91 | 4925 | |
197a4d62 JS |
4926 | root->bind_num("s")->bind(builder); |
4927 | root->bind_num("s")->bind_num("randomize")->bind(builder); | |
4928 | root->bind_num("sec")->bind(builder); | |
4929 | root->bind_num("sec")->bind_num("randomize")->bind(builder); | |
56894e91 | 4930 | |
197a4d62 JS |
4931 | root->bind_num("ms")->bind(builder); |
4932 | root->bind_num("ms")->bind_num("randomize")->bind(builder); | |
4933 | root->bind_num("msec")->bind(builder); | |
4934 | root->bind_num("msec")->bind_num("randomize")->bind(builder); | |
56894e91 | 4935 | |
197a4d62 JS |
4936 | root->bind_num("us")->bind(builder); |
4937 | root->bind_num("us")->bind_num("randomize")->bind(builder); | |
4938 | root->bind_num("usec")->bind(builder); | |
4939 | root->bind_num("usec")->bind_num("randomize")->bind(builder); | |
56894e91 | 4940 | |
197a4d62 JS |
4941 | root->bind_num("ns")->bind(builder); |
4942 | root->bind_num("ns")->bind_num("randomize")->bind(builder); | |
4943 | root->bind_num("nsec")->bind(builder); | |
4944 | root->bind_num("nsec")->bind_num("randomize")->bind(builder); | |
56894e91 | 4945 | |
197a4d62 JS |
4946 | root->bind_num("jiffies")->bind(builder); |
4947 | root->bind_num("jiffies")->bind_num("randomize")->bind(builder); | |
4948 | ||
4949 | root->bind_num("hz")->bind(builder); | |
56894e91 JS |
4950 | } |
4951 | ||
4952 | ||
47dd066d WC |
4953 | // ------------------------------------------------------------------------ |
4954 | // perfmon derived probes | |
4955 | // ------------------------------------------------------------------------ | |
4956 | // This is a new interface to the perfmon hw. | |
4957 | // | |
4958 | ||
4959 | ||
4960 | struct perfmon_var_expanding_copy_visitor: public var_expanding_copy_visitor | |
4961 | { | |
4962 | systemtap_session & sess; | |
4963 | unsigned counter_number; | |
4964 | perfmon_var_expanding_copy_visitor(systemtap_session & s, unsigned c): | |
4965 | sess(s), counter_number(c) {} | |
4966 | void visit_target_symbol (target_symbol* e); | |
4967 | }; | |
4968 | ||
4969 | ||
4970 | void | |
4971 | perfmon_var_expanding_copy_visitor::visit_target_symbol (target_symbol *e) | |
4972 | { | |
4973 | assert(e->base_name.size() > 0 && e->base_name[0] == '$'); | |
4974 | ||
4975 | // Synthesize a function. | |
4976 | functiondecl *fdecl = new functiondecl; | |
4977 | fdecl->tok = e->tok; | |
4978 | embeddedcode *ec = new embeddedcode; | |
4979 | ec->tok = e->tok; | |
4980 | bool lvalue = is_active_lvalue(e); | |
4981 | ||
4982 | if (lvalue ) | |
4983 | throw semantic_error("writes to $counter not permitted"); | |
4984 | ||
4985 | string fname = string("_perfmon_tvar_get") | |
4986 | + "_" + e->base_name.substr(1) | |
4987 | + "_" + lex_cast<string>(counter_number); | |
4988 | ||
4989 | if (e->base_name != "$counter") | |
4990 | throw semantic_error ("target variables not available to perfmon probes"); | |
4991 | ||
4992 | ec->code = "THIS->__retvalue = _pfm_pmd_x[" + | |
4993 | lex_cast<string>(counter_number) + "].reg_num;"; | |
4994 | ec->code += "/* pure */"; | |
4995 | fdecl->name = fname; | |
4996 | fdecl->body = ec; | |
4997 | fdecl->type = pe_long; | |
4998 | sess.functions.push_back(fdecl); | |
4999 | ||
5000 | // Synthesize a functioncall. | |
5001 | functioncall* n = new functioncall; | |
5002 | n->tok = e->tok; | |
5003 | n->function = fname; | |
5004 | n->referent = 0; // NB: must not resolve yet, to ensure inclusion in session | |
5005 | ||
5006 | provide <functioncall*> (this, n); | |
5007 | } | |
5008 | ||
5009 | ||
5010 | enum perfmon_mode | |
5011 | { | |
5012 | perfmon_count, | |
5013 | perfmon_sample | |
5014 | }; | |
5015 | ||
5016 | ||
5017 | struct perfmon_derived_probe: public derived_probe | |
5018 | { | |
5019 | protected: | |
5020 | static unsigned probes_allocated; | |
5021 | ||
5022 | public: | |
5023 | systemtap_session & sess; | |
5024 | string event; | |
5025 | perfmon_mode mode; | |
5026 | ||
5027 | perfmon_derived_probe (probe* p, probe_point* l, systemtap_session &s, | |
5028 | string e, perfmon_mode m); | |
b20febf3 | 5029 | virtual void join_group (systemtap_session& s); |
47dd066d WC |
5030 | }; |
5031 | ||
5032 | ||
b20febf3 | 5033 | struct perfmon_derived_probe_group: public generic_dpg<perfmon_derived_probe> |
47dd066d | 5034 | { |
47dd066d | 5035 | public: |
78f6bba6 FCE |
5036 | void emit_module_decls (systemtap_session&) {} |
5037 | void emit_module_init (systemtap_session&) {} | |
5038 | void emit_module_exit (systemtap_session&) {} | |
47dd066d WC |
5039 | }; |
5040 | ||
5041 | ||
5042 | struct perfmon_builder: public derived_probe_builder | |
5043 | { | |
5044 | perfmon_builder() {} | |
5045 | virtual void build(systemtap_session & sess, | |
5046 | probe * base, | |
5047 | probe_point * location, | |
5048 | std::map<std::string, literal *> const & parameters, | |
5049 | vector<derived_probe *> & finished_results) | |
5050 | { | |
5051 | string event; | |
5052 | if (!get_param (parameters, "counter", event)) | |
5053 | throw semantic_error("perfmon requires an event"); | |
5054 | ||
5055 | sess.perfmon++; | |
5056 | ||
5057 | // XXX: need to revise when doing sampling | |
5058 | finished_results.push_back(new perfmon_derived_probe(base, location, | |
5059 | sess, event, | |
5060 | perfmon_count)); | |
5061 | } | |
5062 | }; | |
5063 | ||
b20febf3 | 5064 | |
47dd066d WC |
5065 | unsigned perfmon_derived_probe::probes_allocated; |
5066 | ||
5067 | perfmon_derived_probe::perfmon_derived_probe (probe* p, probe_point* l, | |
5068 | systemtap_session &s, | |
5069 | string e, perfmon_mode m) | |
5070 | : derived_probe (p, l), sess(s), event(e), mode(m) | |
5071 | { | |
5072 | ++probes_allocated; | |
5073 | ||
5074 | // Now make a local-variable-expanded copy of the probe body | |
5075 | perfmon_var_expanding_copy_visitor v (sess, probes_allocated-1); | |
5076 | require <block*> (&v, &(this->body), base->body); | |
5077 | ||
5078 | if (sess.verbose > 1) | |
5079 | clog << "perfmon-based probe" << endl; | |
5080 | } | |
5081 | ||
5082 | ||
5083 | void | |
b20febf3 | 5084 | perfmon_derived_probe::join_group (systemtap_session& s) |
47dd066d | 5085 | { |
b20febf3 FCE |
5086 | throw semantic_error ("incomplete", this->tok); |
5087 | ||
5088 | if (! s.perfmon_derived_probes) | |
5089 | s.perfmon_derived_probes = new perfmon_derived_probe_group (); | |
5090 | s.perfmon_derived_probes->enroll (this); | |
47dd066d WC |
5091 | } |
5092 | ||
5093 | ||
b20febf3 | 5094 | #if 0 |
47dd066d WC |
5095 | void |
5096 | perfmon_derived_probe::emit_registrations_start (translator_output* o, | |
5097 | unsigned index) | |
5098 | { | |
5099 | for (unsigned i=0; i<locations.size(); i++) | |
5100 | o->newline() << "enter_" << name << "_" << i << " ();"; | |
5101 | } | |
5102 | ||
5103 | ||
5104 | void | |
5105 | perfmon_derived_probe::emit_registrations_end (translator_output * o, | |
5106 | unsigned index) | |
5107 | { | |
5108 | } | |
5109 | ||
5110 | ||
5111 | void | |
5112 | perfmon_derived_probe::emit_deregistrations (translator_output * o) | |
5113 | { | |
5114 | } | |
5115 | ||
5116 | ||
5117 | void | |
5118 | perfmon_derived_probe::emit_probe_entries (translator_output * o) | |
5119 | { | |
5120 | o->newline() << "#ifdef STP_TIMING"; | |
dbb68664 | 5121 | // NB: This variable may be multiply (but identically) defined. |
47dd066d WC |
5122 | o->newline() << "static __cacheline_aligned Stat " << "time_" << basest()->name << ";"; |
5123 | o->newline() << "#endif"; | |
5124 | ||
5125 | for (unsigned i=0; i<locations.size(); i++) | |
5126 | { | |
5127 | probe_point *l = locations[i]; | |
5128 | o->newline() << "/* location " << i << ": " << *l << " */"; | |
5129 | o->newline() << "static void enter_" << name << "_" << i << " (void) {"; | |
5130 | ||
5131 | o->indent(1); | |
5132 | o->newline() << "const char* probe_point = " | |
5133 | << lex_cast_qstring(*l) << ";"; | |
5134 | emit_probe_prologue (o, | |
5135 | (mode == perfmon_count ? | |
5136 | "STAP_SESSION_STARTING" : | |
5137 | "STAP_SESSION_RUNNING")); | |
5138 | ||
5139 | // NB: locals are initialized by probe function itself | |
5140 | o->newline() << name << " (c);"; | |
5141 | ||
5142 | emit_probe_epilogue (o); | |
5143 | ||
5144 | o->newline(-1) << "}\n"; | |
5145 | } | |
5146 | } | |
b20febf3 | 5147 | #endif |
47dd066d WC |
5148 | |
5149 | ||
b20febf3 | 5150 | #if 0 |
47dd066d WC |
5151 | void no_pfm_event_error (string s) |
5152 | { | |
5153 | string msg(string("Cannot find event:" + s)); | |
5154 | throw semantic_error(msg); | |
5155 | } | |
5156 | ||
5157 | ||
5158 | void no_pfm_mask_error (string s) | |
5159 | { | |
5160 | string msg(string("Cannot find mask:" + s)); | |
5161 | throw semantic_error(msg); | |
5162 | } | |
5163 | ||
5164 | ||
5165 | void | |
5166 | split(const string& s, vector<string>& v, const string & separator) | |
5167 | { | |
5168 | string::size_type last_pos = s.find_first_not_of(separator, 0); | |
5169 | string::size_type pos = s.find_first_of(separator, last_pos); | |
5170 | ||
5171 | while (string::npos != pos || string::npos != last_pos) { | |
5172 | v.push_back(s.substr(last_pos, pos - last_pos)); | |
5173 | last_pos = s.find_first_not_of(separator, pos); | |
5174 | pos = s.find_first_of(separator, last_pos); | |
5175 | } | |
5176 | } | |
5177 | ||
5178 | ||
5179 | void | |
5180 | perfmon_derived_probe_group::emit_probes (translator_output* op, unparser* up) | |
5181 | { | |
5182 | for (unsigned i=0; i < probes.size(); i++) | |
5183 | { | |
5184 | op->newline (); | |
5185 | up->emit_probe (probes[i]); | |
5186 | } | |
5187 | } | |
5188 | ||
5189 | ||
5190 | void | |
5191 | perfmon_derived_probe_group::emit_module_init (translator_output* o) | |
5192 | { | |
5193 | int ret; | |
5194 | pfmlib_input_param_t inp; | |
5195 | pfmlib_output_param_t outp; | |
5196 | pfarg_pmd_t pd[PFMLIB_MAX_PMDS]; | |
5197 | pfarg_pmc_t pc[PFMLIB_MAX_PMCS]; | |
5198 | pfarg_ctx_t ctx; | |
5199 | pfarg_load_t load_args; | |
5200 | pfmlib_options_t pfmlib_options; | |
5201 | unsigned int max_counters; | |
5202 | ||
5203 | if ( probes.size() == 0) | |
5204 | return; | |
5205 | ret = pfm_initialize(); | |
5206 | if (ret != PFMLIB_SUCCESS) | |
5207 | throw semantic_error("Unable to generate performance monitoring events (no libpfm)"); | |
5208 | ||
5209 | pfm_get_num_counters(&max_counters); | |
5210 | ||
5211 | memset(&pfmlib_options, 0, sizeof(pfmlib_options)); | |
5212 | pfmlib_options.pfm_debug = 0; /* set to 1 for debug */ | |
5213 | pfmlib_options.pfm_verbose = 0; /* set to 1 for debug */ | |
5214 | pfm_set_options(&pfmlib_options); | |
5215 | ||
5216 | memset(pd, 0, sizeof(pd)); | |
5217 | memset(pc, 0, sizeof(pc)); | |
5218 | memset(&ctx, 0, sizeof(ctx)); | |
5219 | memset(&load_args, 0, sizeof(load_args)); | |
5220 | ||
5221 | /* | |
5222 | * prepare parameters to library. | |
5223 | */ | |
5224 | memset(&inp,0, sizeof(inp)); | |
5225 | memset(&outp,0, sizeof(outp)); | |
5226 | ||
5227 | /* figure out the events */ | |
5228 | for (unsigned i=0; i<probes.size(); ++i) | |
5229 | { | |
5230 | if (probes[i]->event == "cycles") { | |
5231 | if (pfm_get_cycle_event( &inp.pfp_events[i].event) != PFMLIB_SUCCESS) | |
5232 | no_pfm_event_error(probes[i]->event); | |
5233 | } else if (probes[i]->event == "instructions") { | |
5234 | if (pfm_get_inst_retired_event( &inp.pfp_events[i].event) != | |
5235 | PFMLIB_SUCCESS) | |
5236 | no_pfm_event_error(probes[i]->event); | |
5237 | } else { | |
5238 | unsigned int event_id = 0; | |
5239 | unsigned int mask_id = 0; | |
5240 | vector<string> event_spec; | |
5241 | split(probes[i]->event, event_spec, ":"); | |
5242 | int num = event_spec.size(); | |
5243 | int masks = num - 1; | |
5244 | ||
5245 | if (num == 0) | |
5246 | throw semantic_error("No events found"); | |
5247 | ||
5248 | /* setup event */ | |
5249 | if (pfm_find_event(event_spec[0].c_str(), &event_id) != PFMLIB_SUCCESS) | |
5250 | no_pfm_event_error(event_spec[0]); | |
5251 | inp.pfp_events[i].event = event_id; | |
5252 | ||
5253 | /* set up masks */ | |
5254 | if (masks > PFMLIB_MAX_MASKS_PER_EVENT) | |
5255 | throw semantic_error("Too many unit masks specified"); | |
5256 | ||
5257 | for (int j=0; j < masks; j++) { | |
5258 | if (pfm_find_event_mask(event_id, event_spec[j+1].c_str(), | |
5259 | &mask_id) != PFMLIB_SUCCESS) | |
5260 | no_pfm_mask_error(string(event_spec[j+1])); | |
5261 | inp.pfp_events[i].unit_masks[j] = mask_id; | |
5262 | } | |
5263 | inp.pfp_events[i].num_masks = masks; | |
5264 | } | |
5265 | } | |
5266 | ||
5267 | /* number of counters in use */ | |
5268 | inp.pfp_event_count = probes.size(); | |
5269 | ||
5270 | // XXX: no elimination of duplicated counters | |
5271 | if (inp.pfp_event_count>max_counters) | |
5272 | throw semantic_error("Too many performance monitoring events."); | |
5273 | ||
5274 | /* count events both in kernel and user-space */ | |
5275 | inp.pfp_dfl_plm = PFM_PLM0 | PFM_PLM3; | |
5276 | ||
5277 | /* XXX: some cases a perfmon register might be used of watch dog | |
5278 | this code doesn't handle that case */ | |
5279 | ||
5280 | /* figure out the pmcs for the events */ | |
5281 | if ((ret=pfm_dispatch_events(&inp, NULL, &outp, NULL)) != PFMLIB_SUCCESS) | |
5282 | throw semantic_error("Cannot configure events"); | |
5283 | ||
5284 | for (unsigned i=0; i < outp.pfp_pmc_count; i++) { | |
5285 | pc[i].reg_num = outp.pfp_pmcs[i].reg_num; | |
5286 | pc[i].reg_value = outp.pfp_pmcs[i].reg_value; | |
5287 | } | |
5288 | ||
5289 | /* | |
5290 | * There could be more pmc settings than pmd. | |
5291 | * Figure out the actual pmds to use. | |
5292 | */ | |
5293 | for (unsigned i=0, j=0; i < inp.pfp_event_count; i++) { | |
5294 | pd[i].reg_num = outp.pfp_pmcs[j].reg_pmd_num; | |
5295 | for(; j < outp.pfp_pmc_count; j++) | |
5296 | if (outp.pfp_pmcs[j].reg_evt_idx != i) break; | |
5297 | } | |
5298 | ||
5299 | // Output the be probes create function | |
5300 | o->newline() << "static int register_perfmon_probes (void) {"; | |
5301 | o->newline(1) << "int rc = 0;"; | |
5302 | ||
5303 | o->newline() << "/* data for perfmon */"; | |
5304 | o->newline() << "static int _pfm_num_pmc = " << outp.pfp_pmc_count << ";"; | |
5305 | o->newline() << "static struct pfarg_pmc _pfm_pmc[" << outp.pfp_pmc_count | |
5306 | << "] = {"; | |
5307 | /* output the needed bits for pmc here */ | |
5308 | for (unsigned i=0; i < outp.pfp_pmc_count; i++) { | |
5309 | o->newline() << "{.reg_num=" << pc[i].reg_num << ", " | |
5310 | << ".reg_value=" << lex_cast_hex<string>(pc[i].reg_value) | |
5311 | << "},"; | |
5312 | } | |
5313 | ||
5314 | o->newline() << "};"; | |
5315 | o->newline() << "static int _pfm_num_pmd = " << inp.pfp_event_count << ";"; | |
5316 | o->newline() << "static struct pfarg_pmd _pfm_pmd[" << inp.pfp_event_count | |
5317 | << "] = {"; | |
5318 | /* output the needed bits for pmd here */ | |
5319 | for (unsigned i=0; i < inp.pfp_event_count; i++) { | |
5320 | o->newline() << "{.reg_num=" << pd[i].reg_num << ", " | |
5321 | << ".reg_value=" << pd[i].reg_value << "},"; | |
5322 | } | |
5323 | o->newline() << "};"; | |
5324 | o->newline(); | |
5325 | ||
5326 | o->newline() << "_pfm_pmc_x=_pfm_pmc;"; | |
5327 | o->newline() << "_pfm_num_pmc_x=_pfm_num_pmc;"; | |
5328 | o->newline() << "_pfm_pmd_x=_pfm_pmd;"; | |
5329 | o->newline() << "_pfm_num_pmd_x=_pfm_num_pmd;"; | |
5330 | ||
5331 | // call all the function bodies associated with perfcounters | |
5332 | for (unsigned i=0; i < probes.size (); i++) | |
5333 | probes[i]->emit_registrations_start (o,i); | |
5334 | ||
5335 | /* generate call to turn on instrumentation */ | |
5336 | o->newline() << "_pfm_context.ctx_flags |= PFM_FL_SYSTEM_WIDE;"; | |
5337 | o->newline() << "rc = rc || _stp_perfmon_setup(&_pfm_desc, &_pfm_context,"; | |
5338 | o->newline(1) << "_pfm_pmc, _pfm_num_pmc,"; | |
5339 | o->newline() << "_pfm_pmd, _pfm_num_pmd);"; | |
5340 | o->newline(-1); | |
5341 | ||
5342 | o->newline() << "return rc;"; | |
5343 | o->newline(-1) << "}\n"; | |
5344 | ||
5345 | // Output the be probes destroy function | |
5346 | o->newline() << "static void unregister_perfmon_probes (void) {"; | |
5347 | o->newline(1) << "_stp_perfmon_shutdown(_pfm_desc);"; | |
5348 | o->newline(-1) << "}\n"; | |
5349 | } | |
b20febf3 | 5350 | #endif |
47dd066d | 5351 | |
47dd066d | 5352 | |
b55bc428 | 5353 | // ------------------------------------------------------------------------ |
bd2b1e68 | 5354 | // Standard tapset registry. |
b55bc428 FCE |
5355 | // ------------------------------------------------------------------------ |
5356 | ||
7a053d3b | 5357 | void |
f8220a7b | 5358 | register_standard_tapsets(systemtap_session & s) |
b55bc428 | 5359 | { |
f8220a7b | 5360 | s.pattern_root->bind("begin")->bind(new be_builder(true)); |
16e8f21f | 5361 | s.pattern_root->bind_num("begin")->bind(new be_builder(true)); |
f8220a7b | 5362 | s.pattern_root->bind("end")->bind(new be_builder(false)); |
16e8f21f JS |
5363 | s.pattern_root->bind_num("end")->bind(new be_builder(false)); |
5364 | ||
6e3347a9 FCE |
5365 | s.pattern_root->bind("never")->bind(new never_builder()); |
5366 | ||
197a4d62 | 5367 | timer_builder::register_patterns(s.pattern_root); |
39e57ce0 | 5368 | s.pattern_root->bind("timer")->bind("profile")->bind(new profile_builder()); |
47dd066d | 5369 | s.pattern_root->bind("perfmon")->bind_str("counter")->bind(new perfmon_builder()); |
b98a8d73 | 5370 | |
30a279be | 5371 | // dwarf-based kernel/module parts |
f8220a7b | 5372 | dwarf_derived_probe::register_patterns(s.pattern_root); |
30a279be FCE |
5373 | |
5374 | // marker-based kernel/module parts | |
5375 | s.pattern_root->bind("kernel")->bind_str("mark")->bind(new mark_builder()); | |
5376 | s.pattern_root->bind_str("module")->bind_str("mark")->bind(new mark_builder()); | |
b55bc428 | 5377 | } |
dc38c0ae DS |
5378 | |
5379 | ||
b20febf3 FCE |
5380 | vector<derived_probe_group*> |
5381 | all_session_groups(systemtap_session& s) | |
dc38c0ae | 5382 | { |
b20febf3 FCE |
5383 | vector<derived_probe_group*> g; |
5384 | #define DOONE(x) if (s. x##_derived_probes) g.push_back (s. x##_derived_probes) | |
5385 | DOONE(be); | |
5386 | DOONE(dwarf); | |
5387 | DOONE(timer); | |
5388 | DOONE(profile); | |
5389 | DOONE(mark); | |
5390 | DOONE(hrtimer); | |
5391 | DOONE(perfmon); | |
5392 | #undef DOONE | |
5393 | return g; | |
46b84a80 | 5394 | } |