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2b066ec1 | 1 | // elaboration functions |
482fe2af | 2 | // Copyright (C) 2005-2009 Red Hat Inc. |
1773fd03 | 3 | // Copyright (C) 2008 Intel Corporation |
69c68955 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. | |
2b066ec1 FCE |
9 | |
10 | #include "config.h" | |
11 | #include "elaborate.h" | |
12 | #include "parse.h" | |
20c6c071 | 13 | #include "tapsets.h" |
dc38c0ae | 14 | #include "session.h" |
72dbc915 | 15 | #include "util.h" |
2b066ec1 FCE |
16 | |
17 | extern "C" { | |
18 | #include <sys/utsname.h> | |
a477f3f1 | 19 | #include <fnmatch.h> |
2b066ec1 FCE |
20 | } |
21 | ||
2b066ec1 | 22 | #include <algorithm> |
67c0a579 GH |
23 | #include <fstream> |
24 | #include <map> | |
29e64872 | 25 | #include <cassert> |
67c0a579 GH |
26 | #include <set> |
27 | #include <vector> | |
1b07c728 FCE |
28 | #include <algorithm> |
29 | #include <iterator> | |
30 | ||
2b066ec1 | 31 | |
2b066ec1 FCE |
32 | using namespace std; |
33 | ||
34 | ||
35 | // ------------------------------------------------------------------------ | |
36 | ||
5d23847d FCE |
37 | // Used in probe_point condition construction. Either argument may be |
38 | // NULL; if both, return NULL too. Resulting expression is a deep | |
39 | // copy for symbol resolution purposes. | |
40 | expression* add_condition (expression* a, expression* b) | |
41 | { | |
42 | if (!a && !b) return 0; | |
43 | if (! a) return deep_copy_visitor::deep_copy(b); | |
44 | if (! b) return deep_copy_visitor::deep_copy(a); | |
45 | logical_and_expr la; | |
46 | la.op = "&&"; | |
47 | la.left = a; | |
48 | la.right = b; | |
49 | la.tok = a->tok; // or could be b->tok | |
50 | return deep_copy_visitor::deep_copy(& la); | |
51 | } | |
52 | ||
53 | // ------------------------------------------------------------------------ | |
54 | ||
55 | ||
2b066ec1 FCE |
56 | |
57 | derived_probe::derived_probe (probe *p): | |
58 | base (p) | |
59 | { | |
5d23847d FCE |
60 | assert (p); |
61 | this->locations = p->locations; | |
62 | this->tok = p->tok; | |
63 | this->privileged = p->privileged; | |
64 | this->body = deep_copy_visitor::deep_copy(p->body); | |
2b066ec1 FCE |
65 | } |
66 | ||
67 | ||
68 | derived_probe::derived_probe (probe *p, probe_point *l): | |
69 | base (p) | |
70 | { | |
5d23847d FCE |
71 | assert (p); |
72 | this->tok = p->tok; | |
73 | this->privileged = p->privileged; | |
74 | this->body = deep_copy_visitor::deep_copy(p->body); | |
cbbe8080 | 75 | |
5d23847d FCE |
76 | assert (l); |
77 | this->locations.push_back (l); | |
2b066ec1 FCE |
78 | } |
79 | ||
98afd80e | 80 | |
b8da0ad1 FCE |
81 | void |
82 | derived_probe::printsig (ostream& o) const | |
83 | { | |
84 | probe::printsig (o); | |
85 | printsig_nested (o); | |
86 | } | |
87 | ||
88 | void | |
89 | derived_probe::printsig_nested (ostream& o) const | |
90 | { | |
91 | // We'd like to enclose the probe derivation chain in a /* */ | |
92 | // comment delimiter. But just printing /* base->printsig() */ is | |
93 | // not enough, since base might itself be a derived_probe. So we, | |
94 | // er, "cleverly" encode our nesting state as a formatting flag for | |
95 | // the ostream. | |
96 | ios::fmtflags f = o.flags (ios::internal); | |
97 | if (f & ios::internal) | |
98 | { | |
99 | // already nested | |
100 | o << " <- "; | |
101 | base->printsig (o); | |
102 | } | |
103 | else | |
104 | { | |
105 | // outermost nesting | |
106 | o << " /* <- "; | |
107 | base->printsig (o); | |
108 | o << " */"; | |
109 | } | |
110 | // restore flags | |
111 | (void) o.flags (f); | |
112 | } | |
113 | ||
114 | ||
c3a3c0c9 | 115 | void |
2c5a19c6 | 116 | derived_probe::collect_derivation_chain (std::vector<probe*> &probes_list) |
c3a3c0c9 WC |
117 | { |
118 | probes_list.push_back(this); | |
119 | base->collect_derivation_chain(probes_list); | |
120 | } | |
121 | ||
122 | ||
b20febf3 | 123 | probe_point* |
b8da0ad1 | 124 | derived_probe::sole_location () const |
dc38c0ae | 125 | { |
b20febf3 FCE |
126 | if (locations.size() == 0) |
127 | throw semantic_error ("derived_probe with no locations", this->tok); | |
128 | else if (locations.size() > 1) | |
129 | throw semantic_error ("derived_probe with too many locations", this->tok); | |
57148ee7 | 130 | else |
b20febf3 | 131 | return locations[0]; |
dc38c0ae DS |
132 | } |
133 | ||
134 | ||
47dd066d | 135 | |
20c6c071 | 136 | // ------------------------------------------------------------------------ |
98afd80e FCE |
137 | // Members of derived_probe_builder |
138 | ||
139 | bool | |
140 | derived_probe_builder::get_param (std::map<std::string, literal*> const & params, | |
141 | const std::string& key, | |
142 | std::string& value) | |
143 | { | |
144 | map<string, literal *>::const_iterator i = params.find (key); | |
145 | if (i == params.end()) | |
146 | return false; | |
147 | literal_string * ls = dynamic_cast<literal_string *>(i->second); | |
148 | if (!ls) | |
149 | return false; | |
150 | value = ls->value; | |
151 | return true; | |
152 | } | |
153 | ||
20c6c071 | 154 | |
98afd80e FCE |
155 | bool |
156 | derived_probe_builder::get_param (std::map<std::string, literal*> const & params, | |
157 | const std::string& key, | |
158 | int64_t& value) | |
159 | { | |
160 | map<string, literal *>::const_iterator i = params.find (key); | |
161 | if (i == params.end()) | |
162 | return false; | |
163 | if (i->second == NULL) | |
164 | return false; | |
165 | literal_number * ln = dynamic_cast<literal_number *>(i->second); | |
166 | if (!ln) | |
167 | return false; | |
168 | value = ln->value; | |
169 | return true; | |
170 | } | |
171 | ||
172 | ||
888af770 FCE |
173 | bool |
174 | derived_probe_builder::has_null_param (std::map<std::string, literal*> const & params, | |
175 | const std::string& key) | |
176 | { | |
177 | map<string, literal *>::const_iterator i = params.find(key); | |
178 | return (i != params.end() && i->second == NULL); | |
179 | } | |
180 | ||
181 | ||
98afd80e FCE |
182 | |
183 | // ------------------------------------------------------------------------ | |
20c6c071 GH |
184 | // Members of match_key. |
185 | ||
57148ee7 FCE |
186 | match_key::match_key(string const & n) |
187 | : name(n), | |
188 | have_parameter(false), | |
5d23847d | 189 | parameter_type(pe_unknown) |
20c6c071 GH |
190 | { |
191 | } | |
192 | ||
193 | match_key::match_key(probe_point::component const & c) | |
194 | : name(c.functor), | |
195 | have_parameter(c.arg != NULL), | |
5d23847d | 196 | parameter_type(c.arg ? c.arg->type : pe_unknown) |
20c6c071 GH |
197 | { |
198 | } | |
199 | ||
200 | match_key & | |
57148ee7 | 201 | match_key::with_number() |
20c6c071 GH |
202 | { |
203 | have_parameter = true; | |
5d23847d | 204 | parameter_type = pe_long; |
20c6c071 GH |
205 | return *this; |
206 | } | |
207 | ||
208 | match_key & | |
57148ee7 | 209 | match_key::with_string() |
20c6c071 GH |
210 | { |
211 | have_parameter = true; | |
5d23847d | 212 | parameter_type = pe_string; |
20c6c071 GH |
213 | return *this; |
214 | } | |
215 | ||
57148ee7 | 216 | string |
20c6c071 GH |
217 | match_key::str() const |
218 | { | |
219 | if (have_parameter) | |
220 | switch (parameter_type) | |
221 | { | |
5d23847d FCE |
222 | case pe_string: return name + "(string)"; |
223 | case pe_long: return name + "(number)"; | |
20c6c071 GH |
224 | default: return name + "(...)"; |
225 | } | |
226 | return name; | |
227 | } | |
228 | ||
57148ee7 | 229 | bool |
20c6c071 GH |
230 | match_key::operator<(match_key const & other) const |
231 | { | |
232 | return ((name < other.name) | |
57148ee7 FCE |
233 | |
234 | || (name == other.name | |
20c6c071 | 235 | && have_parameter < other.have_parameter) |
57148ee7 FCE |
236 | |
237 | || (name == other.name | |
238 | && have_parameter == other.have_parameter | |
20c6c071 GH |
239 | && parameter_type < other.parameter_type)); |
240 | } | |
2b066ec1 | 241 | |
a477f3f1 DS |
242 | static bool |
243 | isglob(string const & str) | |
244 | { | |
245 | return(str.find('*') != str.npos); | |
246 | } | |
247 | ||
248 | bool | |
249 | match_key::globmatch(match_key const & other) const | |
250 | { | |
251 | const char *other_str = other.name.c_str(); | |
252 | const char *name_str = name.c_str(); | |
253 | ||
254 | return ((fnmatch(name_str, other_str, FNM_NOESCAPE) == 0) | |
57148ee7 | 255 | && have_parameter == other.have_parameter |
a477f3f1 DS |
256 | && parameter_type == other.parameter_type); |
257 | } | |
258 | ||
2b066ec1 | 259 | // ------------------------------------------------------------------------ |
20c6c071 GH |
260 | // Members of match_node |
261 | // ------------------------------------------------------------------------ | |
262 | ||
263 | match_node::match_node() | |
264 | : end(NULL) | |
265 | {} | |
266 | ||
267 | match_node * | |
57148ee7 | 268 | match_node::bind(match_key const & k) |
20c6c071 | 269 | { |
b4ceace2 FCE |
270 | if (k.name == "*") |
271 | throw semantic_error("invalid use of wildcard probe point component"); | |
272 | ||
20c6c071 GH |
273 | map<match_key, match_node *>::const_iterator i = sub.find(k); |
274 | if (i != sub.end()) | |
275 | return i->second; | |
276 | match_node * n = new match_node(); | |
277 | sub.insert(make_pair(k, n)); | |
278 | return n; | |
279 | } | |
280 | ||
57148ee7 | 281 | void |
20c6c071 GH |
282 | match_node::bind(derived_probe_builder * e) |
283 | { | |
284 | if (end) | |
59bafbe8 | 285 | throw semantic_error("duplicate probe point pattern"); |
20c6c071 GH |
286 | end = e; |
287 | } | |
288 | ||
57148ee7 | 289 | match_node * |
20c6c071 GH |
290 | match_node::bind(string const & k) |
291 | { | |
292 | return bind(match_key(k)); | |
293 | } | |
294 | ||
295 | match_node * | |
296 | match_node::bind_str(string const & k) | |
297 | { | |
298 | return bind(match_key(k).with_string()); | |
299 | } | |
300 | ||
57148ee7 | 301 | match_node * |
20c6c071 GH |
302 | match_node::bind_num(string const & k) |
303 | { | |
304 | return bind(match_key(k).with_number()); | |
305 | } | |
306 | ||
b4ceace2 FCE |
307 | |
308 | void | |
309 | match_node::find_and_build (systemtap_session& s, | |
310 | probe* p, probe_point *loc, unsigned pos, | |
311 | vector<derived_probe *>& results) | |
20c6c071 | 312 | { |
b4ceace2 | 313 | assert (pos <= loc->components.size()); |
57148ee7 | 314 | if (pos == loc->components.size()) // matched all probe point components so far |
20c6c071 | 315 | { |
b4ceace2 FCE |
316 | derived_probe_builder *b = end; // may be 0 if only nested names are bound |
317 | ||
318 | if (! b) | |
319 | { | |
320 | string alternatives; | |
321 | for (sub_map_iterator_t i = sub.begin(); i != sub.end(); i++) | |
322 | alternatives += string(" ") + i->first.str(); | |
323 | ||
57148ee7 | 324 | throw semantic_error (string("probe point truncated at position ") + |
b4ceace2 | 325 | lex_cast<string> (pos) + |
cfd621bc | 326 | " (follow:" + alternatives + ")", loc->tok); |
b4ceace2 FCE |
327 | } |
328 | ||
329 | map<string, literal *> param_map; | |
330 | for (unsigned i=0; i<pos; i++) | |
331 | param_map[loc->components[i]->functor] = loc->components[i]->arg; | |
332 | // maybe 0 | |
333 | ||
334 | b->build (s, p, loc, param_map, results); | |
20c6c071 | 335 | } |
a477f3f1 | 336 | else if (isglob(loc->components[pos]->functor)) // wildcard? |
20c6c071 | 337 | { |
a477f3f1 DS |
338 | match_key match (* loc->components[pos]); |
339 | ||
828c3ed5 DS |
340 | // Call find_and_build for each possible match. Ignore errors - |
341 | // unless we don't find any match. | |
342 | unsigned int num_results = results.size(); | |
b4ceace2 FCE |
343 | for (sub_map_iterator_t i = sub.begin(); i != sub.end(); i++) |
344 | { | |
a477f3f1 | 345 | const match_key& subkey = i->first; |
828c3ed5 | 346 | match_node* subnode = i->second; |
a477f3f1 | 347 | |
49abf162 FCE |
348 | if (pending_interrupts) break; |
349 | ||
a477f3f1 | 350 | if (match.globmatch(subkey)) |
828c3ed5 | 351 | { |
ddfc759e DS |
352 | if (s.verbose > 2) |
353 | clog << "wildcard '" << loc->components[pos]->functor | |
354 | << "' matched '" << subkey.name << "'" << endl; | |
355 | ||
356 | // When we have a wildcard, we need to create a copy of | |
357 | // the probe point. Then we'll create a copy of the | |
358 | // wildcard component, and substitute the non-wildcard | |
359 | // functor. | |
360 | probe_point *non_wildcard_pp = new probe_point(*loc); | |
361 | probe_point::component *non_wildcard_component | |
362 | = new probe_point::component(*loc->components[pos]); | |
363 | non_wildcard_component->functor = subkey.name; | |
364 | non_wildcard_pp->components[pos] = non_wildcard_component; | |
365 | ||
5d23847d FCE |
366 | // NB: probe conditions are not attached at the wildcard |
367 | // (component/functor) level, but at the overall | |
368 | // probe_point level. | |
369 | ||
ddfc759e | 370 | // recurse (with the non-wildcard probe point) |
a477f3f1 DS |
371 | try |
372 | { | |
ddfc759e DS |
373 | subnode->find_and_build (s, p, non_wildcard_pp, pos+1, |
374 | results); | |
a477f3f1 DS |
375 | } |
376 | catch (const semantic_error& e) | |
377 | { | |
378 | // Ignore semantic_errors while expanding wildcards. | |
379 | // If we get done and nothing was expanded, the code | |
380 | // following the loop will complain. | |
ddfc759e DS |
381 | |
382 | // If this wildcard didn't match, cleanup. | |
383 | delete non_wildcard_pp; | |
384 | delete non_wildcard_component; | |
a477f3f1 | 385 | } |
828c3ed5 | 386 | } |
a477f3f1 | 387 | } |
cedd10f4 | 388 | if (! loc->optional && num_results == results.size()) |
828c3ed5 DS |
389 | { |
390 | // We didn't find any wildcard matches (since the size of | |
391 | // the result vector didn't change). Throw an error. | |
392 | string alternatives; | |
393 | for (sub_map_iterator_t i = sub.begin(); i != sub.end(); i++) | |
394 | alternatives += string(" ") + i->first.str(); | |
57148ee7 | 395 | |
828c3ed5 DS |
396 | throw semantic_error(string("probe point mismatch at position ") + |
397 | lex_cast<string> (pos) + | |
a8cf6a45 MW |
398 | " (alternatives:" + alternatives + ")" + |
399 | " didn't find any wildcard matches", | |
cfd621bc | 400 | loc->tok); |
828c3ed5 | 401 | } |
b4ceace2 | 402 | } |
57148ee7 | 403 | else |
20c6c071 | 404 | { |
b4ceace2 FCE |
405 | match_key match (* loc->components[pos]); |
406 | sub_map_iterator_t i = sub.find (match); | |
407 | if (i == sub.end()) // no match | |
408 | { | |
409 | string alternatives; | |
410 | for (sub_map_iterator_t i = sub.begin(); i != sub.end(); i++) | |
411 | alternatives += string(" ") + i->first.str(); | |
57148ee7 FCE |
412 | |
413 | throw semantic_error (string("probe point mismatch at position ") + | |
b4ceace2 | 414 | lex_cast<string> (pos) + |
cfd621bc FCE |
415 | " (alternatives:" + alternatives + ")", |
416 | loc->tok); | |
b4ceace2 FCE |
417 | } |
418 | ||
419 | match_node* subnode = i->second; | |
420 | // recurse | |
421 | subnode->find_and_build (s, p, loc, pos+1, results); | |
20c6c071 GH |
422 | } |
423 | } | |
424 | ||
b4ceace2 | 425 | |
aa30ccd3 FCE |
426 | void |
427 | match_node::build_no_more (systemtap_session& s) | |
428 | { | |
429 | for (sub_map_iterator_t i = sub.begin(); i != sub.end(); i++) | |
430 | i->second->build_no_more (s); | |
431 | if (end) end->build_no_more (s); | |
432 | } | |
433 | ||
434 | ||
20c6c071 GH |
435 | // ------------------------------------------------------------------------ |
436 | // Alias probes | |
437 | // ------------------------------------------------------------------------ | |
438 | ||
c1d5f3f6 FCE |
439 | struct alias_derived_probe: public derived_probe |
440 | { | |
2c5a19c6 DB |
441 | alias_derived_probe (probe* base, probe_point *l, const probe_alias *a): |
442 | derived_probe (base, l), alias(a) {} | |
c1d5f3f6 | 443 | |
b20febf3 FCE |
444 | void upchuck () { throw semantic_error ("inappropriate", this->tok); } |
445 | ||
446 | // Alias probes are immediately expanded to other derived_probe | |
447 | // types, and are not themselves emitted or listed in | |
448 | // systemtap_session.probes | |
dc38c0ae | 449 | |
78f6bba6 | 450 | void join_group (systemtap_session&) { upchuck (); } |
2c5a19c6 DB |
451 | |
452 | virtual const probe_alias *get_alias () const { return alias; } | |
453 | ||
454 | private: | |
455 | const probe_alias *alias; // Used to check for recursion | |
c1d5f3f6 FCE |
456 | }; |
457 | ||
458 | ||
20c6c071 | 459 | struct |
57148ee7 | 460 | alias_expansion_builder |
20c6c071 GH |
461 | : public derived_probe_builder |
462 | { | |
463 | probe_alias * alias; | |
464 | ||
57148ee7 | 465 | alias_expansion_builder(probe_alias * a) |
20c6c071 GH |
466 | : alias(a) |
467 | {} | |
468 | ||
5227f1ea | 469 | virtual void build(systemtap_session & sess, |
57148ee7 | 470 | probe * use, |
20c6c071 | 471 | probe_point * location, |
78f6bba6 | 472 | std::map<std::string, literal *> const &, |
20c6c071 GH |
473 | vector<derived_probe *> & finished_results) |
474 | { | |
2c5a19c6 DB |
475 | // Don't build the alias expansion if infinite recursion is detected. |
476 | if (checkForRecursiveExpansion (use)) { | |
477 | stringstream msg; | |
478 | msg << "Recursive loop in alias expansion of " << *location << " at " << location->tok->location; | |
479 | // semantic_errors thrown here are ignored. | |
480 | sess.print_error (semantic_error (msg.str())); | |
481 | return; | |
482 | } | |
483 | ||
20c6c071 | 484 | // We're going to build a new probe and wrap it up in an |
c8959a29 | 485 | // alias_expansion_probe so that the expansion loop recognizes it as |
20c6c071 | 486 | // such and re-expands its expansion. |
57148ee7 | 487 | |
2c5a19c6 | 488 | alias_derived_probe * n = new alias_derived_probe (use, location /* soon overwritten */, this->alias); |
20c6c071 GH |
489 | n->body = new block(); |
490 | ||
5d23847d | 491 | // The new probe gets the location list of the alias (with incoming condition joined) |
20c6c071 | 492 | n->locations = alias->locations; |
5d23847d FCE |
493 | for (unsigned i=0; i<n->locations.size(); i++) |
494 | n->locations[i]->condition = add_condition (n->locations[i]->condition, | |
495 | location->condition); | |
496 | ||
c3a3c0c9 WC |
497 | // the token location of the alias, |
498 | n->tok = location->tok; | |
20c6c071 | 499 | |
5227f1ea | 500 | // and statements representing the concatenation of the alias' |
57148ee7 | 501 | // body with the use's. |
5227f1ea GH |
502 | // |
503 | // NB: locals are *not* copied forward, from either alias or | |
504 | // use. The expansion should have its locals re-inferred since | |
505 | // there's concatenated code here and we only want one vardecl per | |
506 | // resulting variable. | |
507 | ||
cedd10f4 | 508 | if (alias->epilogue_style) |
ba6f838d | 509 | n->body = new block (use->body, alias->body); |
cedd10f4 | 510 | else |
ba6f838d | 511 | n->body = new block (alias->body, use->body); |
57148ee7 | 512 | |
cedd10f4 | 513 | derive_probes (sess, n, finished_results, location->optional); |
20c6c071 | 514 | } |
2c5a19c6 DB |
515 | |
516 | bool checkForRecursiveExpansion (probe *use) | |
517 | { | |
518 | // Collect the derivation chain of this probe. | |
519 | vector<probe*>derivations; | |
520 | use->collect_derivation_chain (derivations); | |
521 | ||
522 | // Check all probe points in the alias expansion against the currently-being-expanded probe point | |
523 | // of each of the probes in the derivation chain, looking for a match. This | |
524 | // indicates infinite recursion. | |
525 | // The first element of the derivation chain will be the derived_probe representing 'use', so | |
526 | // start the search with the second element. | |
527 | assert (derivations.size() > 0); | |
528 | assert (derivations[0] == use); | |
529 | for (unsigned d = 1; d < derivations.size(); ++d) { | |
530 | if (use->get_alias() == derivations[d]->get_alias()) | |
531 | return true; // recursion detected | |
532 | } | |
533 | return false; | |
534 | } | |
20c6c071 GH |
535 | }; |
536 | ||
537 | ||
538 | // ------------------------------------------------------------------------ | |
539 | // Pattern matching | |
540 | // ------------------------------------------------------------------------ | |
541 | ||
542 | ||
543 | // Register all the aliases we've seen in library files, and the user | |
544 | // file, as patterns. | |
545 | ||
546 | void | |
547 | systemtap_session::register_library_aliases() | |
548 | { | |
549 | vector<stapfile*> files(library_files); | |
550 | files.push_back(user_file); | |
551 | ||
552 | for (unsigned f = 0; f < files.size(); ++f) | |
553 | { | |
554 | stapfile * file = files[f]; | |
555 | for (unsigned a = 0; a < file->aliases.size(); ++a) | |
556 | { | |
557 | probe_alias * alias = file->aliases[a]; | |
57148ee7 | 558 | try |
59bafbe8 FCE |
559 | { |
560 | for (unsigned n = 0; n < alias->alias_names.size(); ++n) | |
561 | { | |
562 | probe_point * name = alias->alias_names[n]; | |
563 | match_node * n = pattern_root; | |
564 | for (unsigned c = 0; c < name->components.size(); ++c) | |
565 | { | |
566 | probe_point::component * comp = name->components[c]; | |
567 | // XXX: alias parameters | |
568 | if (comp->arg) | |
57148ee7 FCE |
569 | throw semantic_error("alias component " |
570 | + comp->functor | |
59bafbe8 FCE |
571 | + " contains illegal parameter"); |
572 | n = n->bind(comp->functor); | |
573 | } | |
574 | n->bind(new alias_expansion_builder(alias)); | |
575 | } | |
576 | } | |
577 | catch (const semantic_error& e) | |
578 | { | |
7e41d3dc FCE |
579 | semantic_error* er = new semantic_error (e); // copy it |
580 | stringstream msg; | |
581 | msg << e.msg2; | |
582 | msg << " while registering probe alias "; | |
583 | alias->printsig(msg); | |
584 | er->msg2 = msg.str(); | |
585 | print_error (* er); | |
586 | delete er; | |
59bafbe8 | 587 | } |
20c6c071 GH |
588 | } |
589 | } | |
590 | } | |
591 | ||
592 | ||
5227f1ea GH |
593 | static unsigned max_recursion = 100; |
594 | ||
57148ee7 | 595 | struct |
5227f1ea GH |
596 | recursion_guard |
597 | { | |
598 | unsigned & i; | |
599 | recursion_guard(unsigned & i) : i(i) | |
600 | { | |
601 | if (i > max_recursion) | |
602 | throw semantic_error("recursion limit reached"); | |
603 | ++i; | |
604 | } | |
57148ee7 | 605 | ~recursion_guard() |
5227f1ea GH |
606 | { |
607 | --i; | |
608 | } | |
609 | }; | |
610 | ||
20c6c071 GH |
611 | // The match-and-expand loop. |
612 | void | |
b4ceace2 FCE |
613 | derive_probes (systemtap_session& s, |
614 | probe *p, vector<derived_probe*>& dps, | |
cedd10f4 | 615 | bool optional) |
20c6c071 GH |
616 | { |
617 | for (unsigned i = 0; i < p->locations.size(); ++i) | |
618 | { | |
49abf162 FCE |
619 | if (pending_interrupts) break; |
620 | ||
20c6c071 | 621 | probe_point *loc = p->locations[i]; |
a971b891 | 622 | |
fe3d01fa FCE |
623 | try |
624 | { | |
fe3d01fa | 625 | unsigned num_atbegin = dps.size(); |
d898100a FCE |
626 | |
627 | // Pass down optional flag from e.g. alias reference to each | |
628 | // probe_point instance. We do this by temporarily overriding | |
629 | // the probe_point optional flag. We could instead deep-copy | |
630 | // and set a flag on the copy permanently. | |
631 | bool old_loc_opt = loc->optional; | |
632 | loc->optional = loc->optional || optional; | |
633 | s.pattern_root->find_and_build (s, p, loc, 0, dps); // <-- actual derivation! | |
634 | loc->optional = old_loc_opt; | |
fe3d01fa | 635 | unsigned num_atend = dps.size(); |
d898100a FCE |
636 | |
637 | if (! (loc->optional||optional) && // something required, but | |
cedd10f4 | 638 | num_atbegin == num_atend) // nothing new derived! |
d898100a FCE |
639 | throw semantic_error ("no match"); |
640 | ||
641 | if (loc->sufficient && (num_atend > num_atbegin)) | |
642 | { | |
643 | if (s.verbose > 1) | |
644 | { | |
645 | clog << "Probe point "; | |
646 | p->locations[i]->print(clog); | |
647 | clog << " sufficient, skipped"; | |
648 | for (unsigned j = i+1; j < p->locations.size(); ++j) | |
649 | { | |
650 | clog << " "; | |
651 | p->locations[j]->print(clog); | |
652 | } | |
653 | clog << endl; | |
654 | } | |
655 | break; // we need not try to derive for any other locations | |
656 | } | |
fe3d01fa FCE |
657 | } |
658 | catch (const semantic_error& e) | |
659 | { | |
b4ceace2 | 660 | // XXX: prefer not to print_error at every nest/unroll level |
7e41d3dc FCE |
661 | |
662 | semantic_error* er = new semantic_error (e); // copy it | |
663 | stringstream msg; | |
664 | msg << e.msg2; | |
665 | msg << " while resolving probe point " << *loc; | |
666 | er->msg2 = msg.str(); | |
667 | s.print_error (* er); | |
668 | delete er; | |
fe3d01fa | 669 | } |
a971b891 | 670 | |
20c6c071 GH |
671 | } |
672 | } | |
673 | ||
b4ceace2 FCE |
674 | |
675 | ||
20c6c071 | 676 | // ------------------------------------------------------------------------ |
67c0a579 | 677 | // |
d02548c0 | 678 | // Indexable usage checks |
67c0a579 GH |
679 | // |
680 | ||
d02548c0 | 681 | struct symbol_fetcher |
07c17d67 | 682 | : public throwing_visitor |
67c0a579 | 683 | { |
d02548c0 | 684 | symbol *&sym; |
67c0a579 | 685 | |
57148ee7 | 686 | symbol_fetcher (symbol *&sym): sym(sym) |
67c0a579 GH |
687 | {} |
688 | ||
d02548c0 GH |
689 | void visit_symbol (symbol* e) |
690 | { | |
691 | sym = e; | |
692 | } | |
693 | ||
b0be9bdb FCE |
694 | void visit_target_symbol (target_symbol* e) |
695 | { | |
696 | sym = e; | |
697 | } | |
698 | ||
d02548c0 GH |
699 | void visit_arrayindex (arrayindex* e) |
700 | { | |
701 | e->base->visit_indexable (this); | |
702 | } | |
703 | ||
9b5af295 JS |
704 | void visit_cast_op (cast_op* e) |
705 | { | |
706 | sym = e; | |
707 | } | |
708 | ||
d02548c0 GH |
709 | void throwone (const token* t) |
710 | { | |
711 | throw semantic_error ("Expecting symbol or array index expression", t); | |
712 | } | |
713 | }; | |
714 | ||
07c17d67 | 715 | symbol * |
d02548c0 GH |
716 | get_symbol_within_expression (expression *e) |
717 | { | |
718 | symbol *sym = NULL; | |
719 | symbol_fetcher fetcher(sym); | |
720 | e->visit (&fetcher); | |
b0be9bdb | 721 | return sym; // NB: may be null! |
d02548c0 GH |
722 | } |
723 | ||
724 | static symbol * | |
725 | get_symbol_within_indexable (indexable *ix) | |
726 | { | |
727 | symbol *array = NULL; | |
728 | hist_op *hist = NULL; | |
729 | classify_indexable(ix, array, hist); | |
730 | if (array) | |
731 | return array; | |
732 | else | |
733 | return get_symbol_within_expression (hist->stat); | |
734 | } | |
735 | ||
736 | struct mutated_var_collector | |
07c17d67 | 737 | : public traversing_visitor |
d02548c0 GH |
738 | { |
739 | set<vardecl *> * mutated_vars; | |
740 | ||
57148ee7 | 741 | mutated_var_collector (set<vardecl *> * mm) |
d02548c0 GH |
742 | : mutated_vars (mm) |
743 | {} | |
744 | ||
745 | void visit_assignment(assignment* e) | |
746 | { | |
747 | if (e->type == pe_stats && e->op == "<<<") | |
748 | { | |
749 | vardecl *vd = get_symbol_within_expression (e->left)->referent; | |
750 | if (vd) | |
751 | mutated_vars->insert (vd); | |
752 | } | |
1bbeef03 | 753 | traversing_visitor::visit_assignment(e); |
d02548c0 GH |
754 | } |
755 | ||
67c0a579 GH |
756 | void visit_arrayindex (arrayindex *e) |
757 | { | |
d02548c0 GH |
758 | if (is_active_lvalue (e)) |
759 | { | |
760 | symbol *sym; | |
761 | if (e->base->is_symbol (sym)) | |
762 | mutated_vars->insert (sym->referent); | |
763 | else | |
764 | throw semantic_error("Assignment to read-only histogram bucket", e->tok); | |
765 | } | |
1bbeef03 | 766 | traversing_visitor::visit_arrayindex (e); |
67c0a579 GH |
767 | } |
768 | }; | |
769 | ||
770 | ||
d02548c0 | 771 | struct no_var_mutation_during_iteration_check |
07c17d67 | 772 | : public traversing_visitor |
67c0a579 GH |
773 | { |
774 | systemtap_session & session; | |
d02548c0 GH |
775 | map<functiondecl *,set<vardecl *> *> & function_mutates_vars; |
776 | vector<vardecl *> vars_being_iterated; | |
57148ee7 FCE |
777 | |
778 | no_var_mutation_during_iteration_check | |
67c0a579 | 779 | (systemtap_session & sess, |
d02548c0 GH |
780 | map<functiondecl *,set<vardecl *> *> & fmv) |
781 | : session(sess), function_mutates_vars (fmv) | |
67c0a579 GH |
782 | {} |
783 | ||
784 | void visit_arrayindex (arrayindex *e) | |
785 | { | |
d7f3e0c5 | 786 | if (is_active_lvalue(e)) |
67c0a579 | 787 | { |
d02548c0 GH |
788 | vardecl *vd = get_symbol_within_indexable (e->base)->referent; |
789 | if (vd) | |
67c0a579 | 790 | { |
d02548c0 | 791 | for (unsigned i = 0; i < vars_being_iterated.size(); ++i) |
67c0a579 | 792 | { |
d02548c0 GH |
793 | vardecl *v = vars_being_iterated[i]; |
794 | if (v == vd) | |
795 | { | |
796 | string err = ("variable '" + v->name + | |
797 | "' modified during 'foreach' iteration"); | |
798 | session.print_error (semantic_error (err, e->tok)); | |
799 | } | |
67c0a579 GH |
800 | } |
801 | } | |
802 | } | |
1bbeef03 | 803 | traversing_visitor::visit_arrayindex (e); |
67c0a579 GH |
804 | } |
805 | ||
806 | void visit_functioncall (functioncall* e) | |
807 | { | |
57148ee7 | 808 | map<functiondecl *,set<vardecl *> *>::const_iterator i |
d02548c0 | 809 | = function_mutates_vars.find (e->referent); |
67c0a579 | 810 | |
d02548c0 | 811 | if (i != function_mutates_vars.end()) |
67c0a579 | 812 | { |
d02548c0 | 813 | for (unsigned j = 0; j < vars_being_iterated.size(); ++j) |
67c0a579 | 814 | { |
d02548c0 | 815 | vardecl *m = vars_being_iterated[j]; |
67c0a579 GH |
816 | if (i->second->find (m) != i->second->end()) |
817 | { | |
d02548c0 | 818 | string err = ("function call modifies var '" + m->name + |
67c0a579 GH |
819 | "' during 'foreach' iteration"); |
820 | session.print_error (semantic_error (err, e->tok)); | |
821 | } | |
822 | } | |
823 | } | |
824 | ||
1bbeef03 | 825 | traversing_visitor::visit_functioncall (e); |
67c0a579 GH |
826 | } |
827 | ||
828 | void visit_foreach_loop(foreach_loop* s) | |
829 | { | |
d02548c0 GH |
830 | vardecl *vd = get_symbol_within_indexable (s->base)->referent; |
831 | ||
832 | if (vd) | |
833 | vars_being_iterated.push_back (vd); | |
57148ee7 | 834 | |
1bbeef03 | 835 | traversing_visitor::visit_foreach_loop (s); |
d02548c0 GH |
836 | |
837 | if (vd) | |
838 | vars_being_iterated.pop_back(); | |
67c0a579 GH |
839 | } |
840 | }; | |
20c6c071 | 841 | |
2b066ec1 | 842 | |
67c0a579 GH |
843 | // ------------------------------------------------------------------------ |
844 | ||
07c17d67 GH |
845 | struct stat_decl_collector |
846 | : public traversing_visitor | |
847 | { | |
848 | systemtap_session & session; | |
57148ee7 | 849 | |
07c17d67 GH |
850 | stat_decl_collector(systemtap_session & sess) |
851 | : session(sess) | |
852 | {} | |
853 | ||
854 | void visit_stat_op (stat_op* e) | |
855 | { | |
856 | symbol *sym = get_symbol_within_expression (e->stat); | |
857 | if (session.stat_decls.find(sym->name) == session.stat_decls.end()) | |
858 | session.stat_decls[sym->name] = statistic_decl(); | |
859 | } | |
860 | ||
861 | void visit_assignment (assignment* e) | |
862 | { | |
863 | if (e->op == "<<<") | |
864 | { | |
865 | symbol *sym = get_symbol_within_expression (e->left); | |
866 | if (session.stat_decls.find(sym->name) == session.stat_decls.end()) | |
867 | session.stat_decls[sym->name] = statistic_decl(); | |
868 | } | |
869 | else | |
870 | traversing_visitor::visit_assignment(e); | |
871 | } | |
872 | ||
873 | void visit_hist_op (hist_op* e) | |
874 | { | |
875 | symbol *sym = get_symbol_within_expression (e->stat); | |
876 | statistic_decl new_stat; | |
877 | ||
878 | if (e->htype == hist_linear) | |
879 | { | |
880 | new_stat.type = statistic_decl::linear; | |
881 | assert (e->params.size() == 3); | |
882 | new_stat.linear_low = e->params[0]; | |
883 | new_stat.linear_high = e->params[1]; | |
884 | new_stat.linear_step = e->params[2]; | |
885 | } | |
886 | else | |
887 | { | |
888 | assert (e->htype == hist_log); | |
889 | new_stat.type = statistic_decl::logarithmic; | |
e38723d2 | 890 | assert (e->params.size() == 0); |
07c17d67 GH |
891 | } |
892 | ||
893 | map<string, statistic_decl>::iterator i = session.stat_decls.find(sym->name); | |
894 | if (i == session.stat_decls.end()) | |
895 | session.stat_decls[sym->name] = new_stat; | |
896 | else | |
897 | { | |
898 | statistic_decl & old_stat = i->second; | |
899 | if (!(old_stat == new_stat)) | |
900 | { | |
901 | if (old_stat.type == statistic_decl::none) | |
902 | i->second = new_stat; | |
903 | else | |
904 | { | |
905 | // FIXME: Support multiple co-declared histogram types | |
57148ee7 | 906 | semantic_error se("multiple histogram types declared on '" + sym->name + "'", |
07c17d67 GH |
907 | e->tok); |
908 | session.print_error (se); | |
909 | } | |
910 | } | |
57148ee7 | 911 | } |
07c17d67 GH |
912 | } |
913 | ||
914 | }; | |
915 | ||
916 | static int | |
917 | semantic_pass_stats (systemtap_session & sess) | |
918 | { | |
919 | stat_decl_collector sdc(sess); | |
920 | ||
f76427a2 FCE |
921 | for (map<string,functiondecl*>::iterator it = sess.functions.begin(); it != sess.functions.end(); it++) |
922 | it->second->body->visit (&sdc); | |
07c17d67 | 923 | |
57148ee7 | 924 | for (unsigned i = 0; i < sess.probes.size(); ++i) |
07c17d67 GH |
925 | sess.probes[i]->body->visit (&sdc); |
926 | ||
927 | for (unsigned i = 0; i < sess.globals.size(); ++i) | |
928 | { | |
929 | vardecl *v = sess.globals[i]; | |
930 | if (v->type == pe_stats) | |
931 | { | |
57148ee7 | 932 | |
07c17d67 GH |
933 | if (sess.stat_decls.find(v->name) == sess.stat_decls.end()) |
934 | { | |
935 | semantic_error se("unable to infer statistic parameters for global '" + v->name + "'"); | |
936 | sess.print_error (se); | |
937 | } | |
938 | } | |
939 | } | |
57148ee7 | 940 | |
7e41d3dc | 941 | return sess.num_errors(); |
07c17d67 GH |
942 | } |
943 | ||
5d23847d FCE |
944 | // ------------------------------------------------------------------------ |
945 | ||
946 | // Enforce variable-related invariants: no modification of | |
947 | // a foreach()-iterated array. | |
948 | static int | |
949 | semantic_pass_vars (systemtap_session & sess) | |
950 | { | |
57148ee7 | 951 | |
5d23847d FCE |
952 | map<functiondecl *, set<vardecl *> *> fmv; |
953 | no_var_mutation_during_iteration_check chk(sess, fmv); | |
57148ee7 | 954 | |
f76427a2 | 955 | for (map<string,functiondecl*>::iterator it = sess.functions.begin(); it != sess.functions.end(); it++) |
5d23847d | 956 | { |
f76427a2 | 957 | functiondecl * fn = it->second; |
5d23847d FCE |
958 | if (fn->body) |
959 | { | |
960 | set<vardecl *> * m = new set<vardecl *>(); | |
961 | mutated_var_collector mc (m); | |
962 | fn->body->visit (&mc); | |
963 | fmv[fn] = m; | |
964 | } | |
965 | } | |
966 | ||
f76427a2 | 967 | for (map<string,functiondecl*>::iterator it = sess.functions.begin(); it != sess.functions.end(); it++) |
5d23847d | 968 | { |
f76427a2 FCE |
969 | functiondecl * fn = it->second; |
970 | if (fn->body) fn->body->visit (&chk); | |
5d23847d FCE |
971 | } |
972 | ||
973 | for (unsigned i = 0; i < sess.probes.size(); ++i) | |
974 | { | |
975 | if (sess.probes[i]->body) | |
976 | sess.probes[i]->body->visit (&chk); | |
57148ee7 | 977 | } |
5d23847d FCE |
978 | |
979 | return sess.num_errors(); | |
980 | } | |
981 | ||
982 | ||
983 | // ------------------------------------------------------------------------ | |
984 | ||
985 | // Rewrite probe condition expressions into probe bodies. Tricky and | |
986 | // exciting business, this. This: | |
987 | // | |
988 | // probe foo if (g1 || g2) { ... } | |
989 | // probe bar { ... g1 ++ ... } | |
990 | // | |
991 | // becomes: | |
992 | // | |
993 | // probe begin(MAX) { if (! (g1 || g2)) %{ disable_probe_foo %} } | |
994 | // probe foo { if (! (g1 || g2)) next; ... } | |
57148ee7 | 995 | // probe bar { ... g1 ++ ...; |
5d23847d FCE |
996 | // if (g1 || g2) %{ enable_probe_foo %} else %{ disable_probe_foo %} |
997 | // } | |
998 | // | |
999 | // XXX: As a first cut, do only the "inline probe condition" part of the | |
1000 | // transform. | |
1001 | ||
1002 | static int | |
1003 | semantic_pass_conditions (systemtap_session & sess) | |
1004 | { | |
1005 | for (unsigned i = 0; i < sess.probes.size(); ++i) | |
1006 | { | |
1007 | derived_probe* p = sess.probes[i]; | |
1008 | expression* e = p->sole_location()->condition; | |
1009 | if (e) | |
1010 | { | |
1011 | varuse_collecting_visitor vut; | |
1012 | e->visit (& vut); | |
1013 | ||
1014 | if (! vut.written.empty()) | |
1015 | { | |
1016 | string err = ("probe condition must not modify any variables"); | |
1017 | sess.print_error (semantic_error (err, e->tok)); | |
1018 | } | |
1019 | else if (vut.embedded_seen) | |
1020 | { | |
1021 | sess.print_error (semantic_error ("probe condition must not include impure embedded-C", e->tok)); | |
1022 | } | |
1023 | ||
1024 | // Add the condition expression to the front of the | |
1025 | // derived_probe body. | |
1026 | if_statement *ifs = new if_statement (); | |
1027 | ifs->tok = e->tok; | |
1028 | ifs->thenblock = new next_statement (); | |
1029 | ifs->thenblock->tok = e->tok; | |
1030 | ifs->elseblock = NULL; | |
1031 | unary_expression *notex = new unary_expression (); | |
1032 | notex->op = "!"; | |
1033 | notex->tok = e->tok; | |
1034 | notex->operand = e; | |
1035 | ifs->condition = notex; | |
ba6f838d | 1036 | p->body = new block (ifs, p->body); |
5d23847d | 1037 | } |
57148ee7 | 1038 | } |
5d23847d FCE |
1039 | |
1040 | return sess.num_errors(); | |
1041 | } | |
1042 | ||
1043 | ||
07c17d67 GH |
1044 | // ------------------------------------------------------------------------ |
1045 | ||
2b066ec1 FCE |
1046 | |
1047 | static int semantic_pass_symbols (systemtap_session&); | |
c214bd6a DS |
1048 | static int semantic_pass_optimize1 (systemtap_session&); |
1049 | static int semantic_pass_optimize2 (systemtap_session&); | |
2b066ec1 | 1050 | static int semantic_pass_types (systemtap_session&); |
d02548c0 | 1051 | static int semantic_pass_vars (systemtap_session&); |
07c17d67 | 1052 | static int semantic_pass_stats (systemtap_session&); |
5d23847d | 1053 | static int semantic_pass_conditions (systemtap_session&); |
2b066ec1 FCE |
1054 | |
1055 | ||
1056 | // Link up symbols to their declarations. Set the session's | |
1057 | // files/probes/functions/globals vectors from the transitively | |
1058 | // reached set of stapfiles in s.library_files, starting from | |
20c6c071 | 1059 | // s.user_file. Perform automatic tapset inclusion and probe |
2b066ec1 FCE |
1060 | // alias expansion. |
1061 | static int | |
1062 | semantic_pass_symbols (systemtap_session& s) | |
1063 | { | |
1064 | symresolution_info sym (s); | |
1065 | ||
1066 | // NB: s.files can grow during this iteration, so size() can | |
1067 | // return gradually increasing numbers. | |
1068 | s.files.push_back (s.user_file); | |
1069 | for (unsigned i = 0; i < s.files.size(); i++) | |
1070 | { | |
49abf162 | 1071 | if (pending_interrupts) break; |
2b066ec1 FCE |
1072 | stapfile* dome = s.files[i]; |
1073 | ||
1074 | // Pass 1: add globals and functions to systemtap-session master list, | |
1075 | // so the find_* functions find them | |
1076 | ||
1077 | for (unsigned i=0; i<dome->globals.size(); i++) | |
1078 | s.globals.push_back (dome->globals[i]); | |
1079 | ||
1080 | for (unsigned i=0; i<dome->functions.size(); i++) | |
f76427a2 | 1081 | s.functions[dome->functions[i]->name] = dome->functions[i]; |
2b066ec1 | 1082 | |
54dfabe9 FCE |
1083 | for (unsigned i=0; i<dome->embeds.size(); i++) |
1084 | s.embeds.push_back (dome->embeds[i]); | |
1085 | ||
2b066ec1 FCE |
1086 | // Pass 2: process functions |
1087 | ||
1088 | for (unsigned i=0; i<dome->functions.size(); i++) | |
1089 | { | |
49abf162 | 1090 | if (pending_interrupts) break; |
2b066ec1 FCE |
1091 | functiondecl* fd = dome->functions[i]; |
1092 | ||
57148ee7 | 1093 | try |
2b066ec1 | 1094 | { |
f80d9004 JS |
1095 | for (unsigned j=0; j<s.code_filters.size(); j++) |
1096 | fd->body = s.code_filters[j]->require (fd->body); | |
1097 | ||
8a43522c GH |
1098 | sym.current_function = fd; |
1099 | sym.current_probe = 0; | |
1100 | fd->body->visit (& sym); | |
2b066ec1 FCE |
1101 | } |
1102 | catch (const semantic_error& e) | |
1103 | { | |
1104 | s.print_error (e); | |
1105 | } | |
1106 | } | |
1107 | ||
5227f1ea | 1108 | // Pass 3: derive probes and resolve any further symbols in the |
57148ee7 | 1109 | // derived results. |
2b066ec1 FCE |
1110 | |
1111 | for (unsigned i=0; i<dome->probes.size(); i++) | |
1112 | { | |
49abf162 | 1113 | if (pending_interrupts) break; |
2b066ec1 FCE |
1114 | probe* p = dome->probes [i]; |
1115 | vector<derived_probe*> dps; | |
1116 | ||
a971b891 FCE |
1117 | // much magic happens here: probe alias expansion, wildcard |
1118 | // matching, low-level derived_probe construction. | |
b4ceace2 | 1119 | derive_probes (s, p, dps); |
2b066ec1 FCE |
1120 | |
1121 | for (unsigned j=0; j<dps.size(); j++) | |
1122 | { | |
49abf162 | 1123 | if (pending_interrupts) break; |
2b066ec1 | 1124 | derived_probe* dp = dps[j]; |
b20febf3 FCE |
1125 | s.probes.push_back (dp); |
1126 | dp->join_group (s); | |
2b066ec1 | 1127 | |
57148ee7 | 1128 | try |
2b066ec1 | 1129 | { |
f80d9004 JS |
1130 | for (unsigned k=0; k<s.code_filters.size(); k++) |
1131 | dp->body = s.code_filters[k]->require (dp->body); | |
1132 | ||
2b066ec1 | 1133 | sym.current_function = 0; |
5227f1ea | 1134 | sym.current_probe = dp; |
2b066ec1 | 1135 | dp->body->visit (& sym); |
5d23847d FCE |
1136 | |
1137 | // Process the probe-point condition expression. | |
1138 | sym.current_function = 0; | |
1139 | sym.current_probe = 0; | |
1140 | if (dp->sole_location()->condition) | |
1141 | dp->sole_location()->condition->visit (& sym); | |
2b066ec1 FCE |
1142 | } |
1143 | catch (const semantic_error& e) | |
1144 | { | |
1145 | s.print_error (e); | |
1146 | } | |
1147 | } | |
1148 | } | |
1149 | } | |
aa30ccd3 FCE |
1150 | |
1151 | // Inform all derived_probe builders that we're done with | |
1152 | // all resolution, so it's time to release caches. | |
1153 | s.pattern_root->build_no_more (s); | |
57148ee7 | 1154 | |
7e41d3dc | 1155 | return s.num_errors(); // all those print_error calls |
2b066ec1 FCE |
1156 | } |
1157 | ||
1158 | ||
0a102c82 SC |
1159 | // Keep unread global variables for probe end value display. |
1160 | void add_global_var_display (systemtap_session& s) | |
1161 | { | |
5ae31731 FCE |
1162 | // Don't generate synthetic end probes when in listings mode; |
1163 | // it would clutter up the list of probe points with "end ...". | |
1164 | if (s.listing_mode) return; | |
3438f38f | 1165 | |
0a102c82 SC |
1166 | varuse_collecting_visitor vut; |
1167 | for (unsigned i=0; i<s.probes.size(); i++) | |
1168 | { | |
1169 | s.probes[i]->body->visit (& vut); | |
1170 | ||
1171 | if (s.probes[i]->sole_location()->condition) | |
1172 | s.probes[i]->sole_location()->condition->visit (& vut); | |
1173 | } | |
1174 | ||
1175 | for (unsigned g=0; g < s.globals.size(); g++) | |
1176 | { | |
1177 | vardecl* l = s.globals[g]; | |
1178 | if (vut.read.find (l) != vut.read.end() | |
e491a713 | 1179 | || vut.written.find (l) == vut.written.end()) |
0a102c82 SC |
1180 | continue; |
1181 | ||
b5852334 | 1182 | // Don't generate synthetic end probes for unread globals |
5ae31731 FCE |
1183 | // declared only within tapsets. (RHBZ 468139), but rather |
1184 | // only within the end-user script. | |
1185 | ||
7584f162 RA |
1186 | bool tapset_global = false; |
1187 | for (size_t m=0; m < s.library_files.size(); m++) | |
1188 | { | |
1189 | for (size_t n=0; n < s.library_files[m]->globals.size(); n++) | |
1190 | { | |
1191 | if (l->name == s.library_files[m]->globals[n]->name) | |
1192 | {tapset_global = true; break;} | |
1193 | } | |
1194 | } | |
1195 | if (tapset_global) | |
1196 | continue; | |
5ae31731 | 1197 | |
0a102c82 SC |
1198 | print_format* pf = new print_format; |
1199 | probe* p = new probe; | |
1200 | probe_point* pl = new probe_point; | |
1201 | probe_point::component* c = new probe_point::component("end"); | |
1202 | token* print_tok = new token; | |
1203 | vector<derived_probe*> dps; | |
6d2685fe | 1204 | block *b = new block; |
0a102c82 SC |
1205 | |
1206 | pl->components.push_back (c); | |
db48cbe9 | 1207 | p->tok = l->tok; |
0a102c82 SC |
1208 | p->locations.push_back (pl); |
1209 | print_tok->type = tok_identifier; | |
1210 | print_tok->content = "printf"; | |
1211 | ||
1212 | // Create a symbol | |
1213 | symbol* g_sym = new symbol; | |
1214 | g_sym->name = l->name; | |
1215 | g_sym->tok = l->tok; | |
1216 | g_sym->type = l->type; | |
57148ee7 | 1217 | g_sym->referent = l; |
0a102c82 SC |
1218 | |
1219 | pf->print_to_stream = true; | |
1220 | pf->print_with_format = true; | |
1221 | pf->print_with_delim = false; | |
1222 | pf->print_with_newline = false; | |
1223 | pf->print_char = false; | |
1224 | pf->raw_components += l->name; | |
1225 | pf->tok = print_tok; | |
1226 | ||
1227 | if (l->index_types.size() == 0) // Scalar | |
1228 | { | |
e071e49b SC |
1229 | if (l->type == pe_stats) |
1230 | pf->raw_components += " @count=%#x @min=%#x @max=%#x @sum=%#x @avg=%#x\\n"; | |
1231 | else if (l->type == pe_string) | |
0a102c82 SC |
1232 | pf->raw_components += "=\"%#s\"\\n"; |
1233 | else | |
1234 | pf->raw_components += "=%#x\\n"; | |
0a102c82 SC |
1235 | pf->components = print_format::string_to_components(pf->raw_components); |
1236 | expr_statement* feb = new expr_statement; | |
1237 | feb->value = pf; | |
1238 | feb->tok = print_tok; | |
e071e49b SC |
1239 | if (l->type == pe_stats) |
1240 | { | |
1241 | struct stat_op* so [5]; | |
1242 | const stat_component_type stypes[] = {sc_count, sc_min, sc_max, sc_sum, sc_average}; | |
1243 | ||
1244 | for (unsigned si = 0; | |
1245 | si < (sizeof(so)/sizeof(struct stat_op*)); | |
1246 | si++) | |
1247 | { | |
1248 | so[si]= new stat_op; | |
1249 | so[si]->ctype = stypes[si]; | |
1250 | so[si]->type = pe_long; | |
1251 | so[si]->stat = g_sym; | |
1252 | so[si]->tok = l->tok; | |
1253 | pf->args.push_back(so[si]); | |
1254 | } | |
1255 | } | |
1256 | else | |
1257 | pf->args.push_back(g_sym); | |
271d408e WH |
1258 | |
1259 | /* PR7053: Checking empty aggregate for global variable */ | |
1260 | if (l->type == pe_stats) { | |
1261 | stat_op *so= new stat_op; | |
1262 | so->ctype = sc_count; | |
1263 | so->type = pe_long; | |
1264 | so->stat = g_sym; | |
1265 | so->tok = l->tok; | |
1266 | comparison *be = new comparison; | |
1267 | be->op = ">"; | |
1268 | be->tok = l->tok; | |
1269 | be->left = so; | |
1270 | be->right = new literal_number(0); | |
1271 | ||
1272 | /* Create printf @count=0x0 in else block */ | |
1273 | print_format* pf_0 = new print_format; | |
1274 | pf_0->print_to_stream = true; | |
1275 | pf_0->print_with_format = true; | |
1276 | pf_0->print_with_delim = false; | |
1277 | pf_0->print_with_newline = false; | |
1278 | pf_0->print_char = false; | |
1279 | pf_0->raw_components += l->name; | |
1280 | pf_0->raw_components += " @count=0x0\\n"; | |
1281 | pf_0->tok = print_tok; | |
1282 | pf_0->components = print_format::string_to_components(pf_0->raw_components); | |
1283 | expr_statement* feb_else = new expr_statement; | |
1284 | feb_else->value = pf_0; | |
1285 | feb_else->tok = print_tok; | |
1286 | if_statement *ifs = new if_statement; | |
1287 | ifs->tok = l->tok; | |
1288 | ifs->condition = be; | |
1289 | ifs->thenblock = feb ; | |
1290 | ifs->elseblock = feb_else; | |
1291 | b->statements.push_back(ifs); | |
1292 | } | |
1293 | else /* other non-stat cases */ | |
1294 | b->statements.push_back(feb); | |
0a102c82 SC |
1295 | } |
1296 | else // Array | |
1297 | { | |
1298 | int idx_count = l->index_types.size(); | |
0a102c82 SC |
1299 | symbol* idx_sym[idx_count]; |
1300 | vardecl* idx_v[idx_count]; | |
1301 | // Create a foreach loop | |
0a102c82 | 1302 | foreach_loop* fe = new foreach_loop; |
e91b23bc FCE |
1303 | fe->sort_direction = -1; // imply decreasing sort on value |
1304 | fe->sort_column = 0; // as in foreach ([a,b,c] in array-) { } | |
0a102c82 SC |
1305 | fe->limit = NULL; |
1306 | ||
1307 | // Create indices for the foreach loop | |
1308 | for (int i=0; i < idx_count; i++) | |
1309 | { | |
0a102c82 SC |
1310 | char *idx_name; |
1311 | if (asprintf (&idx_name, "idx%d", i) < 0) | |
1312 | return; | |
0a102c82 | 1313 | idx_sym[i] = new symbol; |
0a102c82 | 1314 | idx_sym[i]->name = idx_name; |
db48cbe9 | 1315 | idx_sym[i]->tok = l->tok; |
0a102c82 SC |
1316 | idx_v[i] = new vardecl; |
1317 | idx_v[i]->name = idx_name; | |
0a102c82 | 1318 | idx_v[i]->type = l->index_types[i]; |
db48cbe9 | 1319 | idx_v[i]->tok = l->tok; |
0a102c82 SC |
1320 | idx_sym[i]->referent = idx_v[i]; |
1321 | fe->indexes.push_back (idx_sym[i]); | |
1322 | } | |
1323 | ||
1324 | // Create a printf for the foreach loop | |
57148ee7 | 1325 | pf->raw_components += "["; |
0a102c82 | 1326 | for (int i=0; i < idx_count; i++) |
57148ee7 FCE |
1327 | { |
1328 | if (i > 0) | |
1329 | pf->raw_components += ","; | |
1330 | if (l->index_types[i] == pe_string) | |
1331 | pf->raw_components += "\"%#s\""; | |
1332 | else | |
1333 | pf->raw_components += "%#d"; | |
1334 | } | |
1335 | pf->raw_components += "]"; | |
e491a713 SC |
1336 | if (l->type == pe_stats) |
1337 | pf->raw_components += " @count=%#x @min=%#x @max=%#x @sum=%#x @avg=%#x\\n"; | |
1338 | else if (l->type == pe_string) | |
0a102c82 SC |
1339 | pf->raw_components += "=\"%#s\"\\n"; |
1340 | else | |
1341 | pf->raw_components += "=%#x\\n"; | |
1342 | ||
1343 | // Create an index for the array | |
1344 | struct arrayindex* ai = new arrayindex; | |
1345 | ai->tok = l->tok; | |
1346 | ai->base = g_sym; | |
e491a713 | 1347 | |
0a102c82 SC |
1348 | for (int i=0; i < idx_count; i++) |
1349 | { | |
1350 | ai->indexes.push_back (idx_sym[i]); | |
1351 | pf->args.push_back(idx_sym[i]); | |
1352 | } | |
e491a713 SC |
1353 | if (l->type == pe_stats) |
1354 | { | |
1355 | struct stat_op* so [5]; | |
e491a713 | 1356 | const stat_component_type stypes[] = {sc_count, sc_min, sc_max, sc_sum, sc_average}; |
e071e49b SC |
1357 | |
1358 | ai->type = pe_stats; | |
db48cbe9 SC |
1359 | for (unsigned si = 0; |
1360 | si < (sizeof(so)/sizeof(struct stat_op*)); | |
1361 | si++) | |
e491a713 SC |
1362 | { |
1363 | so[si]= new stat_op; | |
1364 | so[si]->ctype = stypes[si]; | |
1365 | so[si]->type = pe_long; | |
1366 | so[si]->stat = ai; | |
db48cbe9 | 1367 | so[si]->tok = l->tok; |
e071e49b | 1368 | pf->args.push_back(so[si]); |
e491a713 | 1369 | } |
e491a713 SC |
1370 | } |
1371 | else | |
1372 | pf->args.push_back(ai); | |
57148ee7 | 1373 | |
0a102c82 SC |
1374 | pf->components = print_format::string_to_components(pf->raw_components); |
1375 | expr_statement* feb = new expr_statement; | |
1376 | feb->value = pf; | |
0a102c82 SC |
1377 | fe->base = g_sym; |
1378 | fe->block = (statement*)feb; | |
1379 | b->statements.push_back(fe); | |
0a102c82 SC |
1380 | } |
1381 | ||
0a102c82 | 1382 | // Add created probe |
6d2685fe SC |
1383 | p->body = b; |
1384 | derive_probes (s, p, dps); | |
0a102c82 SC |
1385 | for (unsigned i = 0; i < dps.size(); i++) |
1386 | { | |
1387 | derived_probe* dp = dps[i]; | |
1388 | s.probes.push_back (dp); | |
1389 | dp->join_group (s); | |
1390 | } | |
6d2685fe SC |
1391 | // Repopulate symbol and type info |
1392 | symresolution_info sym (s); | |
1393 | sym.current_function = 0; | |
1394 | sym.current_probe = dps[0]; | |
1395 | dps[0]->body->visit (& sym); | |
0a102c82 | 1396 | |
6d2685fe SC |
1397 | semantic_pass_types(s); |
1398 | // Mark that variable is read | |
0a102c82 SC |
1399 | vut.read.insert (l); |
1400 | } | |
1401 | } | |
2b066ec1 FCE |
1402 | |
1403 | int | |
1404 | semantic_pass (systemtap_session& s) | |
1405 | { | |
59bafbe8 | 1406 | int rc = 0; |
20c6c071 | 1407 | |
57148ee7 | 1408 | try |
59bafbe8 FCE |
1409 | { |
1410 | s.register_library_aliases(); | |
1411 | register_standard_tapsets(s); | |
57148ee7 | 1412 | |
5d23847d FCE |
1413 | if (rc == 0) rc = semantic_pass_symbols (s); |
1414 | if (rc == 0) rc = semantic_pass_conditions (s); | |
c214bd6a | 1415 | if (rc == 0 && ! s.unoptimized) rc = semantic_pass_optimize1 (s); |
59bafbe8 | 1416 | if (rc == 0) rc = semantic_pass_types (s); |
0a102c82 | 1417 | if (rc == 0) add_global_var_display (s); |
c214bd6a | 1418 | if (rc == 0 && ! s.unoptimized) rc = semantic_pass_optimize2 (s); |
d02548c0 | 1419 | if (rc == 0) rc = semantic_pass_vars (s); |
07c17d67 | 1420 | if (rc == 0) rc = semantic_pass_stats (s); |
57148ee7 | 1421 | |
277f2b79 FCE |
1422 | if (s.probes.size() == 0 && !s.listing_mode) |
1423 | throw semantic_error ("no probes found"); | |
59bafbe8 FCE |
1424 | } |
1425 | catch (const semantic_error& e) | |
1426 | { | |
1427 | s.print_error (e); | |
21beacc9 | 1428 | rc ++; |
59bafbe8 | 1429 | } |
57148ee7 | 1430 | |
2b066ec1 FCE |
1431 | return rc; |
1432 | } | |
1433 | ||
1434 | ||
1435 | // ------------------------------------------------------------------------ | |
1436 | ||
1437 | ||
1438 | systemtap_session::systemtap_session (): | |
b20febf3 | 1439 | // NB: pointer members must be manually initialized! |
20c6c071 | 1440 | pattern_root(new match_node), |
b20febf3 | 1441 | user_file (0), |
57148ee7 FCE |
1442 | be_derived_probes(0), |
1443 | dwarf_derived_probes(0), | |
1444 | uprobe_derived_probes(0), | |
1445 | utrace_derived_probes(0), | |
1446 | itrace_derived_probes(0), | |
1447 | task_finder_derived_probes(0), | |
1448 | timer_derived_probes(0), | |
1449 | profile_derived_probes(0), | |
1450 | mark_derived_probes(0), | |
f9355a6c | 1451 | tracepoint_derived_probes(0), |
57148ee7 FCE |
1452 | hrtimer_derived_probes(0), |
1453 | perfmon_derived_probes(0), | |
1454 | procfs_derived_probes(0), | |
6561773f FCE |
1455 | op (0), up (0), |
1456 | sym_kprobes_text_start (0), | |
1457 | sym_kprobes_text_end (0), | |
cfd621bc | 1458 | sym_stext (0), |
405b71b8 | 1459 | module_cache (0), |
cfd621bc | 1460 | last_token (0) |
2b066ec1 FCE |
1461 | { |
1462 | } | |
1463 | ||
1464 | ||
cfd621bc FCE |
1465 | // Print this given token, but abbreviate it if the last one had the |
1466 | // same file name. | |
1467 | void | |
1468 | systemtap_session::print_token (ostream& o, const token* tok) | |
1469 | { | |
1470 | assert (tok); | |
1471 | ||
1472 | if (last_token && last_token->location.file == tok->location.file) | |
1473 | { | |
1474 | stringstream tmpo; | |
1475 | tmpo << *tok; | |
1476 | string ts = tmpo.str(); | |
1477 | // search & replace the file name with nothing | |
1478 | size_t idx = ts.find (tok->location.file); | |
1479 | if (idx != string::npos) | |
1480 | ts.replace (idx, tok->location.file.size(), ""); | |
57148ee7 | 1481 | |
cfd621bc FCE |
1482 | o << ts; |
1483 | } | |
1484 | else | |
1485 | o << *tok; | |
1486 | ||
1487 | last_token = tok; | |
1488 | } | |
1489 | ||
1490 | ||
1491 | ||
2b066ec1 FCE |
1492 | void |
1493 | systemtap_session::print_error (const semantic_error& e) | |
1494 | { | |
b487a14d | 1495 | string message_str[2]; |
1b1b4ceb | 1496 | string align_semantic_error (" "); |
7e41d3dc | 1497 | |
b487a14d FCE |
1498 | // We generate two messages. The second one ([1]) is printed |
1499 | // without token compression, for purposes of duplicate elimination. | |
1500 | // This way, the same message that may be generated once with a | |
1501 | // compressed and once with an uncompressed token still only gets | |
1502 | // printed once. | |
1503 | for (int i=0; i<2; i++) | |
1504 | { | |
1505 | stringstream message; | |
fecccf83 | 1506 | |
b487a14d FCE |
1507 | message << "semantic error: " << e.what (); |
1508 | if (e.tok1 || e.tok2) | |
1509 | message << ": "; | |
fecccf83 | 1510 | if (e.tok1) |
b487a14d FCE |
1511 | { |
1512 | if (i == 0) print_token (message, e.tok1); | |
1513 | else message << *e.tok1; | |
1514 | } | |
1515 | message << e.msg2; | |
fecccf83 | 1516 | if (e.tok2) |
b487a14d FCE |
1517 | { |
1518 | if (i == 0) print_token (message, e.tok2); | |
1519 | else message << *e.tok2; | |
1520 | } | |
1521 | message << endl; | |
1522 | message_str[i] = message.str(); | |
1523 | } | |
7e41d3dc FCE |
1524 | |
1525 | // Duplicate elimination | |
b487a14d | 1526 | if (seen_errors.find (message_str[1]) == seen_errors.end()) |
7e41d3dc | 1527 | { |
b487a14d FCE |
1528 | seen_errors.insert (message_str[1]); |
1529 | cerr << message_str[0]; | |
1b1b4ceb RA |
1530 | |
1531 | if (e.tok1) | |
1532 | print_error_source (cerr, align_semantic_error, e.tok1); | |
1533 | ||
1534 | if (e.tok2) | |
1535 | print_error_source (cerr, align_semantic_error, e.tok2); | |
7e41d3dc FCE |
1536 | } |
1537 | ||
1538 | if (e.chain) | |
1539 | print_error (* e.chain); | |
2b066ec1 FCE |
1540 | } |
1541 | ||
1b1b4ceb RA |
1542 | void |
1543 | systemtap_session::print_error_source (std::ostream& message, | |
1544 | std::string& align, const token* tok) | |
1545 | { | |
1546 | unsigned i = 0; | |
1547 | unsigned line = tok->location.line; | |
1548 | unsigned col = tok->location.column; | |
1549 | string file_contents; | |
84680f7e FCE |
1550 | |
1551 | assert (tok); | |
1b1b4ceb RA |
1552 | if (tok->location.stap_file) |
1553 | file_contents = tok->location.stap_file->file_contents; | |
1554 | else | |
1555 | //No source to print, silently exit | |
1556 | return; | |
1557 | size_t start_pos = 0, end_pos = 0; | |
1558 | //Navigate to the appropriate line | |
1559 | while (i != line && end_pos != std::string::npos) | |
1560 | { | |
1561 | start_pos = end_pos; | |
1562 | end_pos = file_contents.find ('\n', start_pos) + 1; | |
1563 | i++; | |
1564 | } | |
1565 | message << align << "source: " << file_contents.substr (start_pos, end_pos-start_pos-1) << endl; | |
1566 | message << align << " "; | |
1567 | //Navigate to the appropriate column | |
1568 | for (i=start_pos; i<start_pos+col-1; i++) | |
1569 | { | |
1570 | if(isspace(file_contents[i])) | |
1571 | message << file_contents[i]; | |
1572 | else | |
1573 | message << ' '; | |
1574 | } | |
1575 | message << "^" << endl; | |
1576 | } | |
1577 | ||
ab54fa85 | 1578 | void |
cfd621bc | 1579 | systemtap_session::print_warning (const string& message_str, const token* tok) |
ab54fa85 | 1580 | { |
ab54fa85 | 1581 | // Duplicate elimination |
1b1b4ceb | 1582 | string align_warning (" "); |
f2782fe5 | 1583 | if (seen_warnings.find (message_str) == seen_warnings.end()) |
ab54fa85 | 1584 | { |
ee448707 | 1585 | seen_warnings.insert (message_str); |
cfd621bc FCE |
1586 | clog << "WARNING: " << message_str; |
1587 | if (tok) { clog << ": "; print_token (clog, tok); } | |
1588 | clog << endl; | |
84680f7e | 1589 | if (tok) { print_error_source (clog, align_warning, tok); } |
ab54fa85 SC |
1590 | } |
1591 | } | |
1592 | ||
2b066ec1 FCE |
1593 | |
1594 | // ------------------------------------------------------------------------ | |
1595 | // semantic processing: symbol resolution | |
1596 | ||
1597 | ||
1598 | symresolution_info::symresolution_info (systemtap_session& s): | |
5227f1ea | 1599 | session (s), current_function (0), current_probe (0) |
2b066ec1 FCE |
1600 | { |
1601 | } | |
1602 | ||
1603 | ||
1604 | void | |
1605 | symresolution_info::visit_block (block* e) | |
1606 | { | |
1607 | for (unsigned i=0; i<e->statements.size(); i++) | |
1608 | { | |
57148ee7 | 1609 | try |
2b066ec1 FCE |
1610 | { |
1611 | e->statements[i]->visit (this); | |
1612 | } | |
1613 | catch (const semantic_error& e) | |
1614 | { | |
1615 | session.print_error (e); | |
1616 | } | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | ||
69c68955 FCE |
1621 | void |
1622 | symresolution_info::visit_foreach_loop (foreach_loop* e) | |
1623 | { | |
1624 | for (unsigned i=0; i<e->indexes.size(); i++) | |
1625 | e->indexes[i]->visit (this); | |
1626 | ||
57148ee7 | 1627 | symbol *array = NULL; |
d02548c0 GH |
1628 | hist_op *hist = NULL; |
1629 | classify_indexable (e->base, array, hist); | |
69c68955 | 1630 | |
d02548c0 GH |
1631 | if (array) |
1632 | { | |
1633 | if (!array->referent) | |
57148ee7 | 1634 | { |
d02548c0 GH |
1635 | vardecl* d = find_var (array->name, e->indexes.size ()); |
1636 | if (d) | |
1637 | array->referent = d; | |
1638 | else | |
2a99f48f | 1639 | { |
7e41d3dc FCE |
1640 | stringstream msg; |
1641 | msg << "unresolved arity-" << e->indexes.size() | |
1642 | << " global array " << array->name; | |
1643 | throw semantic_error (msg.str(), e->tok); | |
2a99f48f | 1644 | } |
d02548c0 GH |
1645 | } |
1646 | } | |
57148ee7 | 1647 | else |
d02548c0 GH |
1648 | { |
1649 | assert (hist); | |
1650 | hist->visit (this); | |
1651 | } | |
69c68955 | 1652 | |
27f21e8c DS |
1653 | if (e->limit) |
1654 | e->limit->visit (this); | |
1655 | ||
69c68955 FCE |
1656 | e->block->visit (this); |
1657 | } | |
1658 | ||
d02548c0 | 1659 | |
57148ee7 | 1660 | struct |
d98d459c GH |
1661 | delete_statement_symresolution_info: |
1662 | public traversing_visitor | |
1663 | { | |
1664 | symresolution_info *parent; | |
1665 | ||
1666 | delete_statement_symresolution_info (symresolution_info *p): | |
1667 | parent(p) | |
1668 | {} | |
1669 | ||
1670 | void visit_arrayindex (arrayindex* e) | |
1671 | { | |
1672 | parent->visit_arrayindex (e); | |
1673 | } | |
1674 | void visit_functioncall (functioncall* e) | |
1675 | { | |
1676 | parent->visit_functioncall (e); | |
1677 | } | |
1678 | ||
1679 | void visit_symbol (symbol* e) | |
1680 | { | |
1681 | if (e->referent) | |
1682 | return; | |
57148ee7 | 1683 | |
d98d459c GH |
1684 | vardecl* d = parent->find_var (e->name, -1); |
1685 | if (d) | |
1686 | e->referent = d; | |
1687 | else | |
1688 | throw semantic_error ("unresolved array in delete statement", e->tok); | |
1689 | } | |
1690 | }; | |
1691 | ||
57148ee7 | 1692 | void |
d98d459c GH |
1693 | symresolution_info::visit_delete_statement (delete_statement* s) |
1694 | { | |
1695 | delete_statement_symresolution_info di (this); | |
1696 | s->value->visit (&di); | |
1697 | } | |
1698 | ||
69c68955 | 1699 | |
2b066ec1 FCE |
1700 | void |
1701 | symresolution_info::visit_symbol (symbol* e) | |
1702 | { | |
1703 | if (e->referent) | |
1704 | return; | |
1705 | ||
313b2f74 | 1706 | vardecl* d = find_var (e->name, 0); |
2b066ec1 FCE |
1707 | if (d) |
1708 | e->referent = d; | |
1709 | else | |
1710 | { | |
1711 | // new local | |
1712 | vardecl* v = new vardecl; | |
1713 | v->name = e->name; | |
1714 | v->tok = e->tok; | |
1715 | if (current_function) | |
1716 | current_function->locals.push_back (v); | |
1717 | else if (current_probe) | |
1718 | current_probe->locals.push_back (v); | |
1719 | else | |
5d23847d FCE |
1720 | // must be probe-condition expression |
1721 | throw semantic_error ("probe condition must not reference undeclared global", e->tok); | |
2b066ec1 FCE |
1722 | e->referent = v; |
1723 | } | |
1724 | } | |
1725 | ||
1726 | ||
1727 | void | |
1728 | symresolution_info::visit_arrayindex (arrayindex* e) | |
1729 | { | |
1730 | for (unsigned i=0; i<e->indexes.size(); i++) | |
1731 | e->indexes[i]->visit (this); | |
1732 | ||
57148ee7 | 1733 | symbol *array = NULL; |
d02548c0 GH |
1734 | hist_op *hist = NULL; |
1735 | classify_indexable(e->base, array, hist); | |
2b066ec1 | 1736 | |
d02548c0 | 1737 | if (array) |
313b2f74 | 1738 | { |
d02548c0 GH |
1739 | if (array->referent) |
1740 | return; | |
1741 | ||
1742 | vardecl* d = find_var (array->name, e->indexes.size ()); | |
1743 | if (d) | |
1744 | array->referent = d; | |
313b2f74 | 1745 | else |
d02548c0 GH |
1746 | { |
1747 | // new local | |
1748 | vardecl* v = new vardecl; | |
1749 | v->set_arity(e->indexes.size()); | |
1750 | v->name = array->name; | |
1751 | v->tok = array->tok; | |
1752 | if (current_function) | |
1753 | current_function->locals.push_back (v); | |
1754 | else if (current_probe) | |
1755 | current_probe->locals.push_back (v); | |
1756 | else | |
1757 | // must not happen | |
1758 | throw semantic_error ("no current probe/function", e->tok); | |
1759 | array->referent = v; | |
57148ee7 | 1760 | } |
d02548c0 GH |
1761 | } |
1762 | else | |
1763 | { | |
1764 | assert (hist); | |
1765 | hist->visit (this); | |
313b2f74 | 1766 | } |
2b066ec1 FCE |
1767 | } |
1768 | ||
1769 | ||
1770 | void | |
1771 | symresolution_info::visit_functioncall (functioncall* e) | |
1772 | { | |
5d23847d FCE |
1773 | // XXX: we could relax this, if we're going to examine the |
1774 | // vartracking data recursively. See testsuite/semko/fortytwo.stp. | |
1775 | if (! (current_function || current_probe)) | |
1776 | { | |
1777 | // must be probe-condition expression | |
1778 | throw semantic_error ("probe condition must not reference function", e->tok); | |
1779 | } | |
1780 | ||
2b066ec1 FCE |
1781 | for (unsigned i=0; i<e->args.size(); i++) |
1782 | e->args[i]->visit (this); | |
1783 | ||
1784 | if (e->referent) | |
1785 | return; | |
1786 | ||
1787 | functiondecl* d = find_function (e->function, e->args.size ()); | |
1788 | if (d) | |
1789 | e->referent = d; | |
1790 | else | |
2a99f48f | 1791 | { |
7e41d3dc FCE |
1792 | stringstream msg; |
1793 | msg << "unresolved arity-" << e->args.size() | |
1794 | << " function"; | |
1795 | throw semantic_error (msg.str(), e->tok); | |
2a99f48f | 1796 | } |
2b066ec1 FCE |
1797 | } |
1798 | ||
1799 | ||
57148ee7 | 1800 | vardecl* |
d98d459c | 1801 | symresolution_info::find_var (const string& name, int arity) |
2b066ec1 | 1802 | { |
5d23847d FCE |
1803 | if (current_function || current_probe) |
1804 | { | |
1805 | // search locals | |
57148ee7 | 1806 | vector<vardecl*>& locals = (current_function ? |
5d23847d FCE |
1807 | current_function->locals : |
1808 | current_probe->locals); | |
57148ee7 FCE |
1809 | |
1810 | ||
5d23847d | 1811 | for (unsigned i=0; i<locals.size(); i++) |
57148ee7 | 1812 | if (locals[i]->name == name |
5d23847d FCE |
1813 | && locals[i]->compatible_arity(arity)) |
1814 | { | |
1815 | locals[i]->set_arity (arity); | |
1816 | return locals[i]; | |
1817 | } | |
1818 | } | |
2b066ec1 | 1819 | |
313b2f74 GH |
1820 | // search function formal parameters (for scalars) |
1821 | if (arity == 0 && current_function) | |
2b066ec1 FCE |
1822 | for (unsigned i=0; i<current_function->formal_args.size(); i++) |
1823 | if (current_function->formal_args[i]->name == name) | |
8846477c FCE |
1824 | { |
1825 | // NB: no need to check arity here: formal args always scalar | |
1826 | current_function->formal_args[i]->set_arity (0); | |
1827 | return current_function->formal_args[i]; | |
1828 | } | |
2b066ec1 | 1829 | |
313b2f74 | 1830 | // search processed globals |
2b066ec1 | 1831 | for (unsigned i=0; i<session.globals.size(); i++) |
313b2f74 | 1832 | if (session.globals[i]->name == name |
57148ee7 | 1833 | && session.globals[i]->compatible_arity(arity)) |
8846477c | 1834 | { |
313b2f74 | 1835 | session.globals[i]->set_arity (arity); |
8846477c FCE |
1836 | return session.globals[i]; |
1837 | } | |
57148ee7 | 1838 | |
2b066ec1 FCE |
1839 | // search library globals |
1840 | for (unsigned i=0; i<session.library_files.size(); i++) | |
1841 | { | |
1842 | stapfile* f = session.library_files[i]; | |
1843 | for (unsigned j=0; j<f->globals.size(); j++) | |
84e5ea0f FCE |
1844 | { |
1845 | vardecl* g = f->globals[j]; | |
1846 | if (g->name == name && g->compatible_arity (arity)) | |
1847 | { | |
d98d459c | 1848 | g->set_arity (arity); |
57148ee7 FCE |
1849 | |
1850 | // put library into the queue if not already there | |
1851 | if (find (session.files.begin(), session.files.end(), f) | |
84e5ea0f FCE |
1852 | == session.files.end()) |
1853 | session.files.push_back (f); | |
57148ee7 | 1854 | |
84e5ea0f FCE |
1855 | return g; |
1856 | } | |
1857 | } | |
2b066ec1 FCE |
1858 | } |
1859 | ||
2b066ec1 | 1860 | return 0; |
2b066ec1 FCE |
1861 | } |
1862 | ||
1863 | ||
57148ee7 | 1864 | functiondecl* |
2b066ec1 FCE |
1865 | symresolution_info::find_function (const string& name, unsigned arity) |
1866 | { | |
f76427a2 FCE |
1867 | // the common path |
1868 | if (session.functions.find(name) != session.functions.end()) | |
2b066ec1 | 1869 | { |
f76427a2 FCE |
1870 | functiondecl* fd = session.functions[name]; |
1871 | assert (fd->name == name); | |
1872 | if (fd->formal_args.size() == arity) | |
2b066ec1 FCE |
1873 | return fd; |
1874 | } | |
1875 | ||
1876 | // search library globals | |
1877 | for (unsigned i=0; i<session.library_files.size(); i++) | |
1878 | { | |
1879 | stapfile* f = session.library_files[i]; | |
1880 | for (unsigned j=0; j<f->functions.size(); j++) | |
1881 | if (f->functions[j]->name == name && | |
1882 | f->functions[j]->formal_args.size() == arity) | |
1883 | { | |
1884 | // put library into the queue if not already there | |
1885 | if (0) // session.verbose_resolution | |
1886 | cerr << " function " << name << " " | |
1887 | << "is defined from " << f->name << endl; | |
1888 | ||
57148ee7 | 1889 | if (find (session.files.begin(), session.files.end(), f) |
2b066ec1 FCE |
1890 | == session.files.end()) |
1891 | session.files.push_back (f); | |
1892 | // else .. print different message? | |
1893 | ||
1894 | return f->functions[j]; | |
1895 | } | |
1896 | } | |
1897 | ||
1898 | return 0; | |
2b066ec1 FCE |
1899 | } |
1900 | ||
1901 | ||
cbfbbf69 FCE |
1902 | |
1903 | // ------------------------------------------------------------------------ | |
1904 | // optimization | |
1905 | ||
1906 | ||
1907 | // Do away with functiondecls that are never (transitively) called | |
1908 | // from probes. | |
1909 | void semantic_pass_opt1 (systemtap_session& s, bool& relaxed_p) | |
1910 | { | |
1911 | functioncall_traversing_visitor ftv; | |
1912 | for (unsigned i=0; i<s.probes.size(); i++) | |
5d23847d FCE |
1913 | { |
1914 | s.probes[i]->body->visit (& ftv); | |
1915 | if (s.probes[i]->sole_location()->condition) | |
1916 | s.probes[i]->sole_location()->condition->visit (& ftv); | |
1917 | } | |
f76427a2 FCE |
1918 | vector<functiondecl*> new_unused_functions; |
1919 | for (map<string,functiondecl*>::iterator it = s.functions.begin(); it != s.functions.end(); it++) | |
cbfbbf69 | 1920 | { |
f76427a2 FCE |
1921 | functiondecl* fd = it->second; |
1922 | if (ftv.traversed.find(fd) == ftv.traversed.end()) | |
cbfbbf69 | 1923 | { |
f76427a2 | 1924 | if (fd->tok->location.file == s.user_file->name && // !tapset |
a9e8f7e0 | 1925 | ! s.suppress_warnings) |
f76427a2 | 1926 | s.print_warning ("eliding unused function '" + fd->name + "'", fd->tok); |
a9e8f7e0 | 1927 | else if (s.verbose>2) |
f76427a2 | 1928 | clog << "Eliding unused function " << fd->name |
cbfbbf69 | 1929 | << endl; |
f76427a2 FCE |
1930 | // s.functions.erase (it); // NB: can't, since we're already iterating upon it |
1931 | new_unused_functions.push_back (fd); | |
cbfbbf69 | 1932 | relaxed_p = false; |
cbfbbf69 | 1933 | } |
f76427a2 FCE |
1934 | } |
1935 | for (unsigned i=0; i<new_unused_functions.size(); i++) | |
1936 | { | |
1937 | map<string,functiondecl*>::iterator where = s.functions.find (new_unused_functions[i]->name); | |
1938 | assert (where != s.functions.end()); | |
1939 | s.functions.erase (where); | |
1940 | if (s.tapset_compile_coverage) | |
1941 | s.unused_functions.push_back (new_unused_functions[i]); | |
cbfbbf69 FCE |
1942 | } |
1943 | } | |
1944 | ||
1945 | ||
1946 | // ------------------------------------------------------------------------ | |
1947 | ||
1948 | // Do away with local & global variables that are never | |
1949 | // written nor read. | |
cfd621bc | 1950 | void semantic_pass_opt2 (systemtap_session& s, bool& relaxed_p, unsigned iterations) |
cbfbbf69 FCE |
1951 | { |
1952 | varuse_collecting_visitor vut; | |
cfd621bc | 1953 | |
cbfbbf69 | 1954 | for (unsigned i=0; i<s.probes.size(); i++) |
5d23847d FCE |
1955 | { |
1956 | s.probes[i]->body->visit (& vut); | |
1957 | ||
1958 | if (s.probes[i]->sole_location()->condition) | |
1959 | s.probes[i]->sole_location()->condition->visit (& vut); | |
1960 | } | |
1961 | ||
cbfbbf69 FCE |
1962 | // NB: Since varuse_collecting_visitor also traverses down |
1963 | // actually called functions, we don't need to explicitly | |
1964 | // iterate over them. Uncalled ones should have been pruned | |
1965 | // in _opt1 above. | |
1966 | // | |
1967 | // for (unsigned i=0; i<s.functions.size(); i++) | |
1968 | // s.functions[i]->body->visit (& vut); | |
57148ee7 | 1969 | |
cbfbbf69 | 1970 | // Now in vut.read/written, we have a mixture of all locals, globals |
57148ee7 FCE |
1971 | |
1972 | for (unsigned i=0; i<s.probes.size(); i++) | |
cbfbbf69 FCE |
1973 | for (unsigned j=0; j<s.probes[i]->locals.size(); /* see below */) |
1974 | { | |
1975 | vardecl* l = s.probes[i]->locals[j]; | |
a9e8f7e0 | 1976 | |
cbfbbf69 FCE |
1977 | if (vut.read.find (l) == vut.read.end() && |
1978 | vut.written.find (l) == vut.written.end()) | |
1979 | { | |
a9e8f7e0 FCE |
1980 | if (l->tok->location.file == s.user_file->name && // !tapset |
1981 | ! s.suppress_warnings) | |
cfd621bc | 1982 | s.print_warning ("eliding unused variable '" + l->name + "'", l->tok); |
a9e8f7e0 | 1983 | else if (s.verbose>2) |
cbfbbf69 | 1984 | clog << "Eliding unused local variable " |
1b07c728 | 1985 | << l->name << " in " << s.probes[i]->name << endl; |
c3a3c0c9 WC |
1986 | if (s.tapset_compile_coverage) { |
1987 | s.probes[i]->unused_locals.push_back | |
1988 | (s.probes[i]->locals[j]); | |
1989 | } | |
cbfbbf69 FCE |
1990 | s.probes[i]->locals.erase(s.probes[i]->locals.begin() + j); |
1991 | relaxed_p = false; | |
1992 | // don't increment j | |
1993 | } | |
1994 | else | |
27d24ae2 FCE |
1995 | { |
1996 | if (vut.written.find (l) == vut.written.end()) | |
cfd621bc | 1997 | if (iterations == 0 && ! s.suppress_warnings) |
6643650d SC |
1998 | { |
1999 | stringstream o; | |
2000 | vector<vardecl*>::iterator it; | |
cfd621bc FCE |
2001 | for (it = s.probes[i]->locals.begin(); it != s.probes[i]->locals.end(); it++) |
2002 | if (l->name != (*it)->name) | |
2003 | o << " " << (*it)->name; | |
2004 | for (it = s.globals.begin(); it != s.globals.end(); it++) | |
2005 | if (l->name != (*it)->name) | |
2006 | o << " " << (*it)->name; | |
2007 | ||
2008 | s.print_warning ("read-only local variable '" + l->name + "' " + | |
2009 | (o.str() == "" ? "" : ("(alternatives:" + o.str() + ")")), l->tok); | |
6643650d | 2010 | } |
27d24ae2 FCE |
2011 | j++; |
2012 | } | |
cbfbbf69 | 2013 | } |
57148ee7 | 2014 | |
f76427a2 FCE |
2015 | for (map<string,functiondecl*>::iterator it = s.functions.begin(); it != s.functions.end(); it++) |
2016 | { | |
2017 | functiondecl *fd = it->second; | |
2018 | for (unsigned j=0; j<fd->locals.size(); /* see below */) | |
2019 | { | |
2020 | vardecl* l = fd->locals[j]; | |
2021 | if (vut.read.find (l) == vut.read.end() && | |
2022 | vut.written.find (l) == vut.written.end()) | |
2023 | { | |
2024 | if (l->tok->location.file == s.user_file->name && // !tapset | |
2025 | ! s.suppress_warnings) | |
2026 | s.print_warning ("eliding unused variable '" + l->name + "'", l->tok); | |
2027 | else if (s.verbose>2) | |
2028 | clog << "Eliding unused local variable " | |
2029 | << l->name << " in function " << fd->name | |
2030 | << endl; | |
2031 | if (s.tapset_compile_coverage) { | |
2032 | fd->unused_locals.push_back (fd->locals[j]); | |
2033 | } | |
2034 | fd->locals.erase(fd->locals.begin() + j); | |
2035 | relaxed_p = false; | |
2036 | // don't increment j | |
2037 | } | |
2038 | else | |
2039 | { | |
2040 | if (vut.written.find (l) == vut.written.end()) | |
2041 | if (iterations == 0 && ! s.suppress_warnings) | |
2042 | { | |
2043 | stringstream o; | |
2044 | vector<vardecl*>::iterator it; | |
2045 | for (it = fd->formal_args.begin() ; | |
2046 | it != fd->formal_args.end(); it++) | |
2047 | if (l->name != (*it)->name) | |
2048 | o << " " << (*it)->name; | |
2049 | for (it = fd->locals.begin(); it != fd->locals.end(); it++) | |
2050 | if (l->name != (*it)->name) | |
2051 | o << " " << (*it)->name; | |
2052 | for (it = s.globals.begin(); it != s.globals.end(); it++) | |
2053 | if (l->name != (*it)->name) | |
2054 | o << " " << (*it)->name; | |
2055 | ||
2056 | s.print_warning ("read-only local variable '" + l->name + "' " + | |
2057 | (o.str() == "" ? "" : ("(alternatives:" + o.str() + ")")), l->tok); | |
2058 | } | |
cfd621bc | 2059 | |
f76427a2 FCE |
2060 | j++; |
2061 | } | |
2062 | } | |
2063 | } | |
cbfbbf69 FCE |
2064 | for (unsigned i=0; i<s.globals.size(); /* see below */) |
2065 | { | |
2066 | vardecl* l = s.globals[i]; | |
2067 | if (vut.read.find (l) == vut.read.end() && | |
2068 | vut.written.find (l) == vut.written.end()) | |
2069 | { | |
a9e8f7e0 FCE |
2070 | if (l->tok->location.file == s.user_file->name && // !tapset |
2071 | ! s.suppress_warnings) | |
f76427a2 | 2072 | s.print_warning ("eliding unused variable '" + l->name + "'", l->tok); |
a9e8f7e0 | 2073 | else if (s.verbose>2) |
cbfbbf69 FCE |
2074 | clog << "Eliding unused global variable " |
2075 | << l->name << endl; | |
c3a3c0c9 | 2076 | if (s.tapset_compile_coverage) { |
0a102c82 | 2077 | s.unused_globals.push_back(s.globals[i]); |
c3a3c0c9 | 2078 | } |
0a102c82 SC |
2079 | s.globals.erase(s.globals.begin() + i); |
2080 | relaxed_p = false; | |
2081 | // don't increment i | |
cbfbbf69 FCE |
2082 | } |
2083 | else | |
27d24ae2 | 2084 | { |
cfd621bc FCE |
2085 | if (vut.written.find (l) == vut.written.end() && ! l->init) // no initializer |
2086 | if (iterations == 0 && ! s.suppress_warnings) | |
2087 | { | |
2088 | stringstream o; | |
2089 | vector<vardecl*>::iterator it; | |
2090 | for (it = s.globals.begin(); it != s.globals.end(); it++) | |
2091 | if (l->name != (*it)->name) | |
2092 | o << " " << (*it)->name; | |
57148ee7 | 2093 | |
cfd621bc FCE |
2094 | s.print_warning ("read-only global variable '" + l->name + "' " + |
2095 | (o.str() == "" ? "" : ("(alternatives:" + o.str() + ")")), l->tok); | |
2096 | } | |
2097 | ||
27d24ae2 FCE |
2098 | i++; |
2099 | } | |
cbfbbf69 FCE |
2100 | } |
2101 | } | |
2102 | ||
2103 | ||
2104 | // ------------------------------------------------------------------------ | |
2105 | ||
8bda6498 | 2106 | struct dead_assignment_remover: public update_visitor |
cbfbbf69 FCE |
2107 | { |
2108 | systemtap_session& session; | |
2109 | bool& relaxed_p; | |
2110 | const varuse_collecting_visitor& vut; | |
cbfbbf69 FCE |
2111 | |
2112 | dead_assignment_remover(systemtap_session& s, bool& r, | |
57148ee7 | 2113 | const varuse_collecting_visitor& v): |
8bda6498 | 2114 | session(s), relaxed_p(r), vut(v) {} |
cbfbbf69 FCE |
2115 | |
2116 | void visit_assignment (assignment* e); | |
2117 | }; | |
2118 | ||
2119 | ||
cbfbbf69 FCE |
2120 | void |
2121 | dead_assignment_remover::visit_assignment (assignment* e) | |
2122 | { | |
8bda6498 JS |
2123 | e->left = require (e->left); |
2124 | e->right = require (e->right); | |
2125 | ||
cbfbbf69 | 2126 | symbol* left = get_symbol_within_expression (e->left); |
b0be9bdb | 2127 | vardecl* leftvar = left->referent; // NB: may be 0 for unresolved $target |
8bda6498 | 2128 | if (leftvar) // not unresolved $target, so intended sideeffect may be elided |
cbfbbf69 | 2129 | { |
cbfbbf69 FCE |
2130 | if (vut.read.find(leftvar) == vut.read.end()) // var never read? |
2131 | { | |
cf9ff341 FCE |
2132 | // NB: Not so fast! The left side could be an array whose |
2133 | // index expressions may have side-effects. This would be | |
57148ee7 | 2134 | // OK if we could replace the array assignment with a |
cf9ff341 FCE |
2135 | // statement-expression containing all the index expressions |
2136 | // and the rvalue... but we can't. | |
0a102c82 SC |
2137 | // Another possibility is that we have an unread global variable |
2138 | // which are kept for probe end value display. | |
2139 | ||
2140 | bool is_global = false; | |
2141 | vector<vardecl*>::iterator it; | |
2142 | for (it = session.globals.begin(); it != session.globals.end(); it++) | |
2143 | if (leftvar->name == (*it)->name) | |
2144 | { | |
2145 | is_global = true; | |
2146 | break; | |
2147 | } | |
cf9ff341 | 2148 | |
8bda6498 JS |
2149 | varuse_collecting_visitor lvut; |
2150 | e->left->visit (& lvut); | |
2151 | if (lvut.side_effect_free () && !is_global) // XXX: use _wrt() once we track focal_vars | |
cf9ff341 | 2152 | { |
a9e8f7e0 FCE |
2153 | /* PR 1119: NB: This is not necessary here. A write-only |
2154 | variable will also be elided soon at the next _opt2 iteration. | |
2155 | if (e->left->tok->location.file == session.user_file->name && // !tapset | |
2156 | ! session.suppress_warnings) | |
2157 | clog << "WARNING: eliding write-only " << *e->left->tok << endl; | |
2158 | else | |
2159 | */ | |
cf9ff341 | 2160 | if (session.verbose>2) |
57148ee7 | 2161 | clog << "Eliding assignment to " << leftvar->name |
cf9ff341 | 2162 | << " at " << *e->tok << endl; |
57148ee7 | 2163 | |
8bda6498 | 2164 | provide (e->right); // goodbye assignment* |
cf9ff341 | 2165 | relaxed_p = false; |
8bda6498 | 2166 | return; |
cf9ff341 | 2167 | } |
cbfbbf69 FCE |
2168 | } |
2169 | } | |
8bda6498 | 2170 | provide (e); |
e7625481 | 2171 | } |
cbfbbf69 FCE |
2172 | |
2173 | // Let's remove assignments to variables that are never read. We | |
2174 | // rewrite "(foo = expr)" as "(expr)". This makes foo a candidate to | |
2175 | // be optimized away as an unused variable, and expr a candidate to be | |
2176 | // removed as a side-effect-free statement expression. Wahoo! | |
2177 | void semantic_pass_opt3 (systemtap_session& s, bool& relaxed_p) | |
2178 | { | |
2179 | // Recompute the varuse data, which will probably match the opt2 | |
2180 | // copy of the computation, except for those totally unused | |
2181 | // variables that opt2 removed. | |
2182 | varuse_collecting_visitor vut; | |
2183 | for (unsigned i=0; i<s.probes.size(); i++) | |
2184 | s.probes[i]->body->visit (& vut); // includes reachable functions too | |
2185 | ||
2186 | dead_assignment_remover dar (s, relaxed_p, vut); | |
2187 | // This instance may be reused for multiple probe/function body trims. | |
2188 | ||
2189 | for (unsigned i=0; i<s.probes.size(); i++) | |
8bda6498 JS |
2190 | s.probes[i]->body = dar.require (s.probes[i]->body); |
2191 | for (map<string,functiondecl*>::iterator it = s.functions.begin(); | |
2192 | it != s.functions.end(); it++) | |
2193 | it->second->body = dar.require (it->second->body); | |
cbfbbf69 | 2194 | // The rewrite operation is performed within the visitor. |
27d24ae2 FCE |
2195 | |
2196 | // XXX: we could also zap write-only globals here | |
cbfbbf69 FCE |
2197 | } |
2198 | ||
2199 | ||
2200 | // ------------------------------------------------------------------------ | |
2201 | ||
1cd151d5 | 2202 | struct dead_stmtexpr_remover: public update_visitor |
cbfbbf69 FCE |
2203 | { |
2204 | systemtap_session& session; | |
2205 | bool& relaxed_p; | |
1b07c728 | 2206 | set<vardecl*> focal_vars; // vars considered subject to side-effects |
cbfbbf69 | 2207 | |
57148ee7 | 2208 | dead_stmtexpr_remover(systemtap_session& s, bool& r): |
1cd151d5 | 2209 | session(s), relaxed_p(r) {} |
cbfbbf69 FCE |
2210 | |
2211 | void visit_block (block *s); | |
ba6f838d | 2212 | void visit_null_statement (null_statement *s); |
739a3e81 FCE |
2213 | void visit_if_statement (if_statement* s); |
2214 | void visit_foreach_loop (foreach_loop *s); | |
2215 | void visit_for_loop (for_loop *s); | |
cbfbbf69 FCE |
2216 | // XXX: and other places where stmt_expr's might be nested |
2217 | ||
2218 | void visit_expr_statement (expr_statement *s); | |
2219 | }; | |
2220 | ||
2221 | ||
ba6f838d FCE |
2222 | void |
2223 | dead_stmtexpr_remover::visit_null_statement (null_statement *s) | |
2224 | { | |
2225 | // easy! | |
2226 | if (session.verbose>2) | |
2227 | clog << "Eliding side-effect-free null statement " << *s->tok << endl; | |
1cd151d5 JS |
2228 | s = 0; |
2229 | provide (s); | |
ba6f838d FCE |
2230 | } |
2231 | ||
2232 | ||
cbfbbf69 FCE |
2233 | void |
2234 | dead_stmtexpr_remover::visit_block (block *s) | |
2235 | { | |
ba6f838d FCE |
2236 | vector<statement*> new_stmts; |
2237 | for (unsigned i=0; i<s->statements.size(); i++ ) | |
cbfbbf69 | 2238 | { |
1cd151d5 JS |
2239 | statement* new_stmt = require (s->statements[i], true); |
2240 | if (new_stmt != 0) | |
bea72737 JS |
2241 | { |
2242 | // flatten nested blocks into this one | |
1cd151d5 | 2243 | block *b = dynamic_cast<block *>(new_stmt); |
bea72737 JS |
2244 | if (b) |
2245 | { | |
2246 | if (session.verbose>2) | |
2247 | clog << "Flattening nested block " << *b->tok << endl; | |
2248 | new_stmts.insert(new_stmts.end(), | |
2249 | b->statements.begin(), b->statements.end()); | |
2250 | relaxed_p = false; | |
2251 | } | |
2252 | else | |
1cd151d5 | 2253 | new_stmts.push_back (new_stmt); |
bea72737 | 2254 | } |
cbfbbf69 | 2255 | } |
ba6f838d FCE |
2256 | if (new_stmts.size() == 0) |
2257 | { | |
2258 | if (session.verbose>2) | |
2259 | clog << "Eliding side-effect-free empty block " << *s->tok << endl; | |
1cd151d5 | 2260 | s = 0; |
ba6f838d FCE |
2261 | } |
2262 | else if (new_stmts.size() == 1) | |
2263 | { | |
2264 | if (session.verbose>2) | |
2265 | clog << "Eliding side-effect-free singleton block " << *s->tok << endl; | |
1cd151d5 JS |
2266 | provide (new_stmts[0]); |
2267 | return; | |
ba6f838d FCE |
2268 | } |
2269 | else | |
1cd151d5 JS |
2270 | s->statements = new_stmts; |
2271 | provide (s); | |
cbfbbf69 FCE |
2272 | } |
2273 | ||
739a3e81 FCE |
2274 | void |
2275 | dead_stmtexpr_remover::visit_if_statement (if_statement *s) | |
2276 | { | |
1cd151d5 JS |
2277 | s->thenblock = require (s->thenblock, true); |
2278 | s->elseblock = require (s->elseblock, true); | |
ba6f838d | 2279 | |
bea72737 | 2280 | if (s->thenblock == 0) |
ba6f838d | 2281 | { |
bea72737 JS |
2282 | if (s->elseblock == 0) |
2283 | { | |
2284 | // We may be able to elide this statement, if the condition | |
2285 | // expression is side-effect-free. | |
2286 | varuse_collecting_visitor vct; | |
2287 | s->condition->visit(& vct); | |
2288 | if (vct.side_effect_free ()) | |
2289 | { | |
2290 | if (session.verbose>2) | |
2291 | clog << "Eliding side-effect-free if statement " | |
2292 | << *s->tok << endl; | |
1cd151d5 | 2293 | s = 0; // yeah, baby |
bea72737 JS |
2294 | } |
2295 | else | |
2296 | { | |
2297 | // We can still turn it into a simple expr_statement though... | |
2298 | if (session.verbose>2) | |
2299 | clog << "Creating simple evaluation from if statement " | |
2300 | << *s->tok << endl; | |
2301 | expr_statement *es = new expr_statement; | |
2302 | es->value = s->condition; | |
2303 | es->tok = es->value->tok; | |
1cd151d5 JS |
2304 | provide (es); |
2305 | return; | |
bea72737 JS |
2306 | } |
2307 | } | |
2308 | else | |
ba6f838d | 2309 | { |
bea72737 JS |
2310 | // For an else without a then, we can invert the condition logic to |
2311 | // avoid having a null statement in the thenblock | |
ba6f838d | 2312 | if (session.verbose>2) |
bea72737 JS |
2313 | clog << "Inverting the condition of if statement " |
2314 | << *s->tok << endl; | |
2315 | unary_expression *ue = new unary_expression; | |
2316 | ue->operand = s->condition; | |
2317 | ue->tok = ue->operand->tok; | |
2318 | ue->op = "!"; | |
2319 | s->condition = ue; | |
2320 | s->thenblock = s->elseblock; | |
2321 | s->elseblock = 0; | |
ba6f838d FCE |
2322 | } |
2323 | } | |
1cd151d5 | 2324 | provide (s); |
739a3e81 FCE |
2325 | } |
2326 | ||
2327 | void | |
2328 | dead_stmtexpr_remover::visit_foreach_loop (foreach_loop *s) | |
2329 | { | |
1cd151d5 | 2330 | s->block = require(s->block, true); |
ba6f838d FCE |
2331 | |
2332 | if (s->block == 0) | |
2333 | { | |
2334 | if (session.verbose>2) | |
2335 | clog << "Eliding side-effect-free foreach statement " << *s->tok << endl; | |
1cd151d5 | 2336 | s = 0; // yeah, baby |
ba6f838d | 2337 | } |
1cd151d5 | 2338 | provide (s); |
739a3e81 FCE |
2339 | } |
2340 | ||
2341 | void | |
2342 | dead_stmtexpr_remover::visit_for_loop (for_loop *s) | |
2343 | { | |
1cd151d5 | 2344 | s->block = require(s->block, true); |
ba6f838d FCE |
2345 | |
2346 | if (s->block == 0) | |
2347 | { | |
2348 | // We may be able to elide this statement, if the condition | |
2349 | // expression is side-effect-free. | |
2350 | varuse_collecting_visitor vct; | |
2351 | if (s->init) s->init->visit(& vct); | |
2352 | s->cond->visit(& vct); | |
2353 | if (s->incr) s->incr->visit(& vct); | |
2354 | if (vct.side_effect_free ()) | |
2355 | { | |
2356 | if (session.verbose>2) | |
2357 | clog << "Eliding side-effect-free for statement " << *s->tok << endl; | |
1cd151d5 JS |
2358 | s = 0; // yeah, baby |
2359 | } | |
2360 | else | |
2361 | { | |
2362 | // Can't elide this whole statement; put a null in there. | |
2363 | s->block = new null_statement(); | |
2364 | s->block->tok = s->tok; | |
ba6f838d | 2365 | } |
ba6f838d | 2366 | } |
1cd151d5 | 2367 | provide (s); |
739a3e81 FCE |
2368 | } |
2369 | ||
2370 | ||
cbfbbf69 FCE |
2371 | |
2372 | void | |
2373 | dead_stmtexpr_remover::visit_expr_statement (expr_statement *s) | |
2374 | { | |
2375 | // Run a varuse query against the operand expression. If it has no | |
2376 | // side-effects, replace the entire statement expression by a null | |
1cd151d5 | 2377 | // statement with the provide() call. |
cbfbbf69 FCE |
2378 | // |
2379 | // Unlike many other visitors, we do *not* traverse this outermost | |
2380 | // one into the expression subtrees. There is no need - no | |
2381 | // expr_statement nodes will be found there. (Function bodies | |
2382 | // need to be visited explicitly by our caller.) | |
2383 | // | |
2384 | // NB. While we don't share nodes in the parse tree, let's not | |
2385 | // deallocate *s anyway, just in case... | |
2386 | ||
2387 | varuse_collecting_visitor vut; | |
2388 | s->value->visit (& vut); | |
57148ee7 | 2389 | |
1cd151d5 | 2390 | if (vut.side_effect_free_wrt (focal_vars)) |
cbfbbf69 | 2391 | { |
a9e8f7e0 FCE |
2392 | /* PR 1119: NB: this message is not a good idea here. It can |
2393 | name some arbitrary RHS expression of an assignment. | |
2394 | if (s->value->tok->location.file == session.user_file->name && // not tapset | |
2395 | ! session.suppress_warnings) | |
2396 | clog << "WARNING: eliding read-only " << *s->value->tok << endl; | |
57148ee7 | 2397 | else |
a9e8f7e0 | 2398 | */ |
b0ee93c4 | 2399 | if (session.verbose>2) |
cbfbbf69 FCE |
2400 | clog << "Eliding side-effect-free expression " |
2401 | << *s->tok << endl; | |
2402 | ||
ba6f838d FCE |
2403 | // NB: this 0 pointer is invalid to leave around for any length of |
2404 | // time, but the parent parse tree objects above handle it. | |
1cd151d5 | 2405 | s = 0; |
cbfbbf69 FCE |
2406 | relaxed_p = false; |
2407 | } | |
1cd151d5 | 2408 | provide (s); |
cbfbbf69 FCE |
2409 | } |
2410 | ||
2411 | ||
2412 | void semantic_pass_opt4 (systemtap_session& s, bool& relaxed_p) | |
2413 | { | |
2414 | // Finally, let's remove some statement-expressions that have no | |
2415 | // side-effect. These should be exactly those whose private varuse | |
2416 | // visitors come back with an empty "written" and "embedded" lists. | |
57148ee7 | 2417 | |
cbfbbf69 FCE |
2418 | dead_stmtexpr_remover duv (s, relaxed_p); |
2419 | // This instance may be reused for multiple probe/function body trims. | |
2420 | ||
2421 | for (unsigned i=0; i<s.probes.size(); i++) | |
1b07c728 | 2422 | { |
f76427a2 FCE |
2423 | if (pending_interrupts) break; |
2424 | ||
ba6f838d FCE |
2425 | derived_probe* p = s.probes[i]; |
2426 | ||
1b07c728 FCE |
2427 | duv.focal_vars.clear (); |
2428 | duv.focal_vars.insert (s.globals.begin(), | |
2429 | s.globals.end()); | |
ba6f838d FCE |
2430 | duv.focal_vars.insert (p->locals.begin(), |
2431 | p->locals.end()); | |
2432 | ||
1cd151d5 | 2433 | p->body = duv.require(p->body, true); |
ba6f838d FCE |
2434 | if (p->body == 0) |
2435 | { | |
7175b492 FCE |
2436 | if (! s.suppress_warnings |
2437 | && ! s.timing) // PR10070 | |
cfd621bc | 2438 | s.print_warning ("side-effect-free probe '" + p->name + "'", p->tok); |
ba6f838d FCE |
2439 | |
2440 | p->body = new null_statement(); | |
2441 | p->body->tok = p->tok; | |
27d24ae2 FCE |
2442 | |
2443 | // XXX: possible duplicate warnings; see below | |
ba6f838d | 2444 | } |
1b07c728 | 2445 | } |
f76427a2 | 2446 | for (map<string,functiondecl*>::iterator it = s.functions.begin(); it != s.functions.end(); it++) |
1b07c728 | 2447 | { |
f76427a2 FCE |
2448 | if (pending_interrupts) break; |
2449 | ||
2450 | functiondecl* fn = it->second; | |
1b07c728 | 2451 | duv.focal_vars.clear (); |
ba6f838d FCE |
2452 | duv.focal_vars.insert (fn->locals.begin(), |
2453 | fn->locals.end()); | |
2454 | duv.focal_vars.insert (fn->formal_args.begin(), | |
2455 | fn->formal_args.end()); | |
1b07c728 FCE |
2456 | duv.focal_vars.insert (s.globals.begin(), |
2457 | s.globals.end()); | |
ba6f838d | 2458 | |
1cd151d5 | 2459 | fn->body = duv.require(fn->body, true); |
ba6f838d FCE |
2460 | if (fn->body == 0) |
2461 | { | |
2462 | if (! s.suppress_warnings) | |
cfd621bc | 2463 | s.print_warning ("side-effect-free function '" + fn->name + "'", fn->tok); |
ba6f838d FCE |
2464 | |
2465 | fn->body = new null_statement(); | |
2466 | fn->body->tok = fn->tok; | |
27d24ae2 FCE |
2467 | |
2468 | // XXX: the next iteration of the outer optimization loop may | |
2469 | // take this new null_statement away again, and thus give us a | |
2470 | // fresh warning. It would be better if this fixup was performed | |
2471 | // only after the relaxation iterations. | |
2472 | // XXX: or else see bug #6469. | |
ba6f838d | 2473 | } |
1b07c728 | 2474 | } |
cbfbbf69 FCE |
2475 | } |
2476 | ||
bea72737 JS |
2477 | |
2478 | // ------------------------------------------------------------------------ | |
2479 | ||
2480 | // The goal of this visitor is to reduce top-level expressions in void context | |
2481 | // into separate statements that evaluate each subcomponent of the expression. | |
2482 | // The dead-statement-remover can later remove some parts if they have no side | |
2483 | // effects. | |
9f9873df JS |
2484 | // |
2485 | // All expressions must be overridden here so we never visit their subexpressions | |
2486 | // accidentally. Thus, the only visited expressions should be value of an | |
2487 | // expr_statement. | |
2488 | // | |
2489 | // For an expression to replace its expr_statement with something else, it will | |
2490 | // let the new statement provide(), and then provide(0) for itself. The | |
2491 | // expr_statement will take this as a sign that it's been replaced. | |
2492 | struct void_statement_reducer: public update_visitor | |
bea72737 JS |
2493 | { |
2494 | systemtap_session& session; | |
2495 | bool& relaxed_p; | |
bea72737 JS |
2496 | set<vardecl*> focal_vars; // vars considered subject to side-effects |
2497 | ||
2498 | void_statement_reducer(systemtap_session& s, bool& r): | |
9f9873df | 2499 | session(s), relaxed_p(r) {} |
bea72737 | 2500 | |
133c7b1d | 2501 | void visit_expr_statement (expr_statement* s); |
9f9873df JS |
2502 | |
2503 | // expressions in conditional / loop controls are definitely a side effect, | |
2504 | // but still recurse into the child statements | |
bea72737 JS |
2505 | void visit_if_statement (if_statement* s); |
2506 | void visit_for_loop (for_loop* s); | |
2507 | void visit_foreach_loop (foreach_loop* s); | |
2508 | ||
2509 | // these expressions get rewritten into their statement equivalents | |
2510 | void visit_logical_or_expr (logical_or_expr* e); | |
2511 | void visit_logical_and_expr (logical_and_expr* e); | |
2512 | void visit_ternary_expression (ternary_expression* e); | |
2513 | ||
2514 | // all of these can be reduced into simpler statements | |
2515 | void visit_binary_expression (binary_expression* e); | |
2516 | void visit_unary_expression (unary_expression* e); | |
2517 | void visit_comparison (comparison* e); | |
2518 | void visit_concatenation (concatenation* e); | |
2519 | void visit_functioncall (functioncall* e); | |
2520 | void visit_print_format (print_format* e); | |
9b5af295 | 2521 | void visit_cast_op (cast_op* e); |
bea72737 JS |
2522 | |
2523 | // these are a bit hairy to grok due to the intricacies of indexables and | |
2524 | // stats, so I'm chickening out and skipping them... | |
9f9873df JS |
2525 | void visit_array_in (array_in* e) { provide (e); } |
2526 | void visit_arrayindex (arrayindex* e) { provide (e); } | |
2527 | void visit_stat_op (stat_op* e) { provide (e); } | |
2528 | void visit_hist_op (hist_op* e) { provide (e); } | |
bea72737 JS |
2529 | |
2530 | // these can't be reduced because they always have an effect | |
9f9873df JS |
2531 | void visit_return_statement (return_statement* s) { provide (s); } |
2532 | void visit_delete_statement (delete_statement* s) { provide (s); } | |
2533 | void visit_pre_crement (pre_crement* e) { provide (e); } | |
2534 | void visit_post_crement (post_crement* e) { provide (e); } | |
2535 | void visit_assignment (assignment* e) { provide (e); } | |
bea72737 JS |
2536 | }; |
2537 | ||
2538 | ||
133c7b1d JS |
2539 | void |
2540 | void_statement_reducer::visit_expr_statement (expr_statement* s) | |
2541 | { | |
9f9873df | 2542 | s->value = require (s->value, true); |
133c7b1d | 2543 | |
9f9873df JS |
2544 | // if the expression provides 0, that's our signal that a new |
2545 | // statement has been provided, so we shouldn't provide this one. | |
2546 | if (s->value != 0) | |
2547 | provide(s); | |
bea72737 JS |
2548 | } |
2549 | ||
2550 | void | |
2551 | void_statement_reducer::visit_if_statement (if_statement* s) | |
2552 | { | |
9f9873df JS |
2553 | // s->condition is never void |
2554 | s->thenblock = require (s->thenblock); | |
2555 | s->elseblock = require (s->elseblock); | |
2556 | provide (s); | |
bea72737 JS |
2557 | } |
2558 | ||
2559 | void | |
2560 | void_statement_reducer::visit_for_loop (for_loop* s) | |
2561 | { | |
9f9873df JS |
2562 | // s->init/cond/incr are never void |
2563 | s->block = require (s->block); | |
2564 | provide (s); | |
bea72737 JS |
2565 | } |
2566 | ||
2567 | void | |
2568 | void_statement_reducer::visit_foreach_loop (foreach_loop* s) | |
2569 | { | |
9f9873df JS |
2570 | // s->indexes/base/limit are never void |
2571 | s->block = require (s->block); | |
2572 | provide (s); | |
bea72737 JS |
2573 | } |
2574 | ||
2575 | void | |
2576 | void_statement_reducer::visit_logical_or_expr (logical_or_expr* e) | |
2577 | { | |
2578 | // In void context, the evaluation of "a || b" is exactly like | |
2579 | // "if (!a) b", so let's do that instead. | |
2580 | ||
bea72737 JS |
2581 | if (session.verbose>2) |
2582 | clog << "Creating if statement from unused logical-or " | |
2583 | << *e->tok << endl; | |
2584 | ||
2585 | if_statement *is = new if_statement; | |
2586 | is->tok = e->tok; | |
2587 | is->elseblock = 0; | |
bea72737 JS |
2588 | |
2589 | unary_expression *ue = new unary_expression; | |
2590 | ue->operand = e->left; | |
2591 | ue->tok = e->tok; | |
2592 | ue->op = "!"; | |
2593 | is->condition = ue; | |
2594 | ||
133c7b1d | 2595 | expr_statement *es = new expr_statement; |
bea72737 JS |
2596 | es->value = e->right; |
2597 | es->tok = es->value->tok; | |
2598 | is->thenblock = es; | |
2599 | ||
2600 | is->visit(this); | |
2601 | relaxed_p = false; | |
9f9873df JS |
2602 | e = 0; |
2603 | provide (e); | |
bea72737 JS |
2604 | } |
2605 | ||
2606 | void | |
2607 | void_statement_reducer::visit_logical_and_expr (logical_and_expr* e) | |
2608 | { | |
2609 | // In void context, the evaluation of "a && b" is exactly like | |
2610 | // "if (a) b", so let's do that instead. | |
2611 | ||
bea72737 JS |
2612 | if (session.verbose>2) |
2613 | clog << "Creating if statement from unused logical-and " | |
2614 | << *e->tok << endl; | |
2615 | ||
2616 | if_statement *is = new if_statement; | |
2617 | is->tok = e->tok; | |
2618 | is->elseblock = 0; | |
2619 | is->condition = e->left; | |
bea72737 | 2620 | |
133c7b1d | 2621 | expr_statement *es = new expr_statement; |
bea72737 JS |
2622 | es->value = e->right; |
2623 | es->tok = es->value->tok; | |
2624 | is->thenblock = es; | |
2625 | ||
2626 | is->visit(this); | |
2627 | relaxed_p = false; | |
9f9873df JS |
2628 | e = 0; |
2629 | provide (e); | |
bea72737 JS |
2630 | } |
2631 | ||
2632 | void | |
2633 | void_statement_reducer::visit_ternary_expression (ternary_expression* e) | |
2634 | { | |
2635 | // In void context, the evaluation of "a ? b : c" is exactly like | |
2636 | // "if (a) b else c", so let's do that instead. | |
2637 | ||
bea72737 JS |
2638 | if (session.verbose>2) |
2639 | clog << "Creating if statement from unused ternary expression " | |
2640 | << *e->tok << endl; | |
2641 | ||
2642 | if_statement *is = new if_statement; | |
2643 | is->tok = e->tok; | |
2644 | is->condition = e->cond; | |
bea72737 | 2645 | |
133c7b1d | 2646 | expr_statement *es = new expr_statement; |
bea72737 JS |
2647 | es->value = e->truevalue; |
2648 | es->tok = es->value->tok; | |
2649 | is->thenblock = es; | |
2650 | ||
2651 | es = new expr_statement; | |
2652 | es->value = e->falsevalue; | |
2653 | es->tok = es->value->tok; | |
2654 | is->elseblock = es; | |
2655 | ||
2656 | is->visit(this); | |
2657 | relaxed_p = false; | |
9f9873df JS |
2658 | e = 0; |
2659 | provide (e); | |
bea72737 JS |
2660 | } |
2661 | ||
2662 | void | |
2663 | void_statement_reducer::visit_binary_expression (binary_expression* e) | |
2664 | { | |
2665 | // When the result of a binary operation isn't needed, it's just as good to | |
2666 | // evaluate the operands as sequential statements in a block. | |
2667 | ||
bea72737 JS |
2668 | if (session.verbose>2) |
2669 | clog << "Eliding unused binary " << *e->tok << endl; | |
2670 | ||
2671 | block *b = new block; | |
9f9873df | 2672 | b->tok = e->tok; |
bea72737 | 2673 | |
133c7b1d | 2674 | expr_statement *es = new expr_statement; |
bea72737 JS |
2675 | es->value = e->left; |
2676 | es->tok = es->value->tok; | |
2677 | b->statements.push_back(es); | |
2678 | ||
2679 | es = new expr_statement; | |
2680 | es->value = e->right; | |
2681 | es->tok = es->value->tok; | |
2682 | b->statements.push_back(es); | |
2683 | ||
2684 | b->visit(this); | |
2685 | relaxed_p = false; | |
9f9873df JS |
2686 | e = 0; |
2687 | provide (e); | |
bea72737 JS |
2688 | } |
2689 | ||
2690 | void | |
2691 | void_statement_reducer::visit_unary_expression (unary_expression* e) | |
2692 | { | |
2693 | // When the result of a unary operation isn't needed, it's just as good to | |
2694 | // evaluate the operand directly | |
2695 | ||
bea72737 JS |
2696 | if (session.verbose>2) |
2697 | clog << "Eliding unused unary " << *e->tok << endl; | |
2698 | ||
bea72737 | 2699 | relaxed_p = false; |
9f9873df | 2700 | e->operand->visit(this); |
bea72737 JS |
2701 | } |
2702 | ||
2703 | void | |
2704 | void_statement_reducer::visit_comparison (comparison* e) | |
2705 | { | |
2706 | visit_binary_expression(e); | |
2707 | } | |
2708 | ||
2709 | void | |
2710 | void_statement_reducer::visit_concatenation (concatenation* e) | |
2711 | { | |
2712 | visit_binary_expression(e); | |
2713 | } | |
2714 | ||
2715 | void | |
2716 | void_statement_reducer::visit_functioncall (functioncall* e) | |
2717 | { | |
2718 | // If a function call is pure and its result ignored, we can elide the call | |
c7d47935 | 2719 | // and just evaluate the arguments in sequence |
bea72737 JS |
2720 | |
2721 | if (!e->args.size()) | |
9f9873df JS |
2722 | { |
2723 | provide (e); | |
2724 | return; | |
2725 | } | |
bea72737 JS |
2726 | |
2727 | varuse_collecting_visitor vut; | |
2728 | vut.traversed.insert (e->referent); | |
2729 | vut.current_function = e->referent; | |
2730 | e->referent->body->visit (& vut); | |
2731 | if (!vut.side_effect_free_wrt (focal_vars)) | |
9f9873df JS |
2732 | { |
2733 | provide (e); | |
2734 | return; | |
2735 | } | |
bea72737 JS |
2736 | |
2737 | if (session.verbose>2) | |
2738 | clog << "Eliding side-effect-free function call " << *e->tok << endl; | |
2739 | ||
133c7b1d JS |
2740 | block *b = new block; |
2741 | b->tok = e->tok; | |
bea72737 | 2742 | |
133c7b1d | 2743 | for (unsigned i=0; i<e->args.size(); i++ ) |
bea72737 | 2744 | { |
133c7b1d JS |
2745 | expr_statement *es = new expr_statement; |
2746 | es->value = e->args[i]; | |
2747 | es->tok = es->value->tok; | |
bea72737 | 2748 | b->statements.push_back(es); |
bea72737 JS |
2749 | } |
2750 | ||
133c7b1d | 2751 | b->visit(this); |
bea72737 | 2752 | relaxed_p = false; |
9f9873df JS |
2753 | e = 0; |
2754 | provide (e); | |
bea72737 JS |
2755 | } |
2756 | ||
2757 | void | |
2758 | void_statement_reducer::visit_print_format (print_format* e) | |
2759 | { | |
2760 | // When an sprint's return value is ignored, we can simply evaluate the | |
2761 | // arguments in sequence | |
2762 | ||
2763 | if (e->print_to_stream || !e->args.size()) | |
9f9873df JS |
2764 | { |
2765 | provide (e); | |
2766 | return; | |
2767 | } | |
bea72737 JS |
2768 | |
2769 | if (session.verbose>2) | |
2770 | clog << "Eliding unused print " << *e->tok << endl; | |
2771 | ||
133c7b1d JS |
2772 | block *b = new block; |
2773 | b->tok = e->tok; | |
bea72737 | 2774 | |
133c7b1d | 2775 | for (unsigned i=0; i<e->args.size(); i++ ) |
bea72737 | 2776 | { |
133c7b1d JS |
2777 | expr_statement *es = new expr_statement; |
2778 | es->value = e->args[i]; | |
2779 | es->tok = es->value->tok; | |
bea72737 | 2780 | b->statements.push_back(es); |
bea72737 JS |
2781 | } |
2782 | ||
133c7b1d | 2783 | b->visit(this); |
bea72737 | 2784 | relaxed_p = false; |
9f9873df JS |
2785 | e = 0; |
2786 | provide (e); | |
bea72737 JS |
2787 | } |
2788 | ||
9b5af295 JS |
2789 | void |
2790 | void_statement_reducer::visit_cast_op (cast_op* e) | |
2791 | { | |
2792 | // When the result of a cast operation isn't needed, it's just as good to | |
2793 | // evaluate the operand directly | |
2794 | ||
2795 | if (session.verbose>2) | |
2796 | clog << "Eliding unused typecast " << *e->tok << endl; | |
2797 | ||
2798 | relaxed_p = false; | |
2799 | e->operand->visit(this); | |
2800 | } | |
2801 | ||
bea72737 JS |
2802 | |
2803 | void semantic_pass_opt5 (systemtap_session& s, bool& relaxed_p) | |
2804 | { | |
2805 | // Let's simplify statements with unused computed values. | |
2806 | ||
2807 | void_statement_reducer vuv (s, relaxed_p); | |
2808 | // This instance may be reused for multiple probe/function body trims. | |
2809 | ||
2810 | vuv.focal_vars.insert (s.globals.begin(), s.globals.end()); | |
2811 | ||
2812 | for (unsigned i=0; i<s.probes.size(); i++) | |
9f9873df JS |
2813 | s.probes[i]->body = vuv.require (s.probes[i]->body); |
2814 | for (map<string,functiondecl*>::iterator it = s.functions.begin(); | |
2815 | it != s.functions.end(); it++) | |
2816 | it->second->body = vuv.require (it->second->body); | |
bea72737 JS |
2817 | } |
2818 | ||
2819 | ||
88bbd60d DS |
2820 | struct duplicate_function_remover: public functioncall_traversing_visitor |
2821 | { | |
2822 | systemtap_session& s; | |
88bbd60d DS |
2823 | map<functiondecl*, functiondecl*>& duplicate_function_map; |
2824 | ||
c214bd6a | 2825 | duplicate_function_remover(systemtap_session& sess, |
88bbd60d | 2826 | map<functiondecl*, functiondecl*>&dfm): |
c214bd6a | 2827 | s(sess), duplicate_function_map(dfm) {}; |
88bbd60d DS |
2828 | |
2829 | void visit_functioncall (functioncall* e); | |
2830 | }; | |
2831 | ||
2832 | void | |
2833 | duplicate_function_remover::visit_functioncall (functioncall *e) | |
2834 | { | |
2835 | functioncall_traversing_visitor::visit_functioncall (e); | |
2836 | ||
2837 | // If the current function call reference points to a function that | |
2838 | // is a duplicate, replace it. | |
2839 | if (duplicate_function_map.count(e->referent) != 0) | |
2840 | { | |
2841 | if (s.verbose>2) | |
2842 | clog << "Changing " << e->referent->name | |
2843 | << " reference to " | |
2844 | << duplicate_function_map[e->referent]->name | |
2845 | << " reference\n"; | |
2846 | e->tok = duplicate_function_map[e->referent]->tok; | |
2847 | e->function = duplicate_function_map[e->referent]->name; | |
2848 | e->referent = duplicate_function_map[e->referent]; | |
88bbd60d DS |
2849 | } |
2850 | } | |
2851 | ||
2852 | static string | |
2853 | get_functionsig (functiondecl* f) | |
2854 | { | |
2855 | ostringstream s; | |
2856 | ||
2857 | // Get the "name:args body" of the function in s. We have to | |
2858 | // include the args since the function 'x1(a, b)' is different than | |
2859 | // the function 'x2(b, a)' even if the bodies of the two functions | |
2860 | // are exactly the same. | |
2861 | f->printsig(s); | |
2862 | f->body->print(s); | |
2863 | ||
2864 | // printsig puts f->name + ':' on the front. Remove this | |
2865 | // (otherwise, functions would never compare equal). | |
2866 | string str = s.str().erase(0, f->name.size() + 1); | |
2867 | ||
2868 | // Return the function signature. | |
2869 | return str; | |
2870 | } | |
2871 | ||
bea72737 | 2872 | void semantic_pass_opt6 (systemtap_session& s, bool& relaxed_p) |
88bbd60d DS |
2873 | { |
2874 | // Walk through all the functions, looking for duplicates. | |
2875 | map<string, functiondecl*> functionsig_map; | |
2876 | map<functiondecl*, functiondecl*> duplicate_function_map; | |
f76427a2 FCE |
2877 | |
2878 | ||
2879 | vector<functiondecl*> newly_zapped_functions; | |
2880 | for (map<string,functiondecl*>::iterator it = s.functions.begin(); it != s.functions.end(); it++) | |
88bbd60d | 2881 | { |
f76427a2 FCE |
2882 | functiondecl *fd = it->second; |
2883 | string functionsig = get_functionsig(fd); | |
88bbd60d DS |
2884 | |
2885 | if (functionsig_map.count(functionsig) == 0) | |
c214bd6a DS |
2886 | { |
2887 | // This function is unique. Remember it. | |
f76427a2 | 2888 | functionsig_map[functionsig] = fd; |
c214bd6a | 2889 | } |
88bbd60d | 2890 | else |
c214bd6a DS |
2891 | { |
2892 | // This function is a duplicate. | |
f76427a2 FCE |
2893 | duplicate_function_map[fd] = functionsig_map[functionsig]; |
2894 | newly_zapped_functions.push_back (fd); | |
c214bd6a | 2895 | relaxed_p = false; |
c214bd6a | 2896 | } |
88bbd60d | 2897 | } |
f76427a2 FCE |
2898 | for (unsigned i=0; i<newly_zapped_functions.size(); i++) |
2899 | { | |
2900 | map<string,functiondecl*>::iterator where = s.functions.find (newly_zapped_functions[i]->name); | |
2901 | assert (where != s.functions.end()); | |
2902 | s.functions.erase (where); | |
2903 | } | |
2904 | ||
88bbd60d DS |
2905 | |
2906 | // If we have duplicate functions, traverse down the tree, replacing | |
2907 | // the appropriate function calls. | |
2908 | // duplicate_function_remover::visit_functioncall() handles the | |
c214bd6a | 2909 | // details of replacing the function calls. |
88bbd60d DS |
2910 | if (duplicate_function_map.size() != 0) |
2911 | { | |
c214bd6a | 2912 | duplicate_function_remover dfr (s, duplicate_function_map); |
88bbd60d DS |
2913 | |
2914 | for (unsigned i=0; i < s.probes.size(); i++) | |
2915 | s.probes[i]->body->visit(&dfr); | |
2916 | } | |
2917 | } | |
2918 | ||
cbfbbf69 FCE |
2919 | |
2920 | static int | |
c214bd6a | 2921 | semantic_pass_optimize1 (systemtap_session& s) |
cbfbbf69 FCE |
2922 | { |
2923 | // In this pass, we attempt to rewrite probe/function bodies to | |
2924 | // eliminate some blatantly unnecessary code. This is run before | |
2925 | // type inference, but after symbol resolution and derived_probe | |
2926 | // creation. We run an outer "relaxation" loop that repeats the | |
2927 | // optimizations until none of them find anything to remove. | |
2928 | ||
2929 | int rc = 0; | |
2930 | ||
2931 | bool relaxed_p = false; | |
cfd621bc | 2932 | unsigned iterations = 0; |
cbfbbf69 FCE |
2933 | while (! relaxed_p) |
2934 | { | |
49abf162 FCE |
2935 | if (pending_interrupts) break; |
2936 | ||
cbfbbf69 FCE |
2937 | relaxed_p = true; // until proven otherwise |
2938 | ||
2939 | semantic_pass_opt1 (s, relaxed_p); | |
cfd621bc | 2940 | semantic_pass_opt2 (s, relaxed_p, iterations); // produce some warnings only on iteration=0 |
cbfbbf69 FCE |
2941 | semantic_pass_opt3 (s, relaxed_p); |
2942 | semantic_pass_opt4 (s, relaxed_p); | |
bea72737 | 2943 | semantic_pass_opt5 (s, relaxed_p); |
cfd621bc FCE |
2944 | |
2945 | iterations ++; | |
c214bd6a DS |
2946 | } |
2947 | ||
c214bd6a DS |
2948 | return rc; |
2949 | } | |
2950 | ||
2951 | ||
2952 | static int | |
2953 | semantic_pass_optimize2 (systemtap_session& s) | |
2954 | { | |
2955 | // This is run after type inference. We run an outer "relaxation" | |
2956 | // loop that repeats the optimizations until none of them find | |
2957 | // anything to remove. | |
2958 | ||
2959 | int rc = 0; | |
2960 | ||
2961 | bool relaxed_p = false; | |
2962 | while (! relaxed_p) | |
2963 | { | |
49abf162 | 2964 | if (pending_interrupts) break; |
c214bd6a DS |
2965 | relaxed_p = true; // until proven otherwise |
2966 | ||
bea72737 | 2967 | semantic_pass_opt6 (s, relaxed_p); |
cbfbbf69 FCE |
2968 | } |
2969 | ||
cbfbbf69 FCE |
2970 | return rc; |
2971 | } | |
2972 | ||
2973 | ||
2974 | ||
2b066ec1 FCE |
2975 | // ------------------------------------------------------------------------ |
2976 | // type resolution | |
2977 | ||
2978 | ||
2979 | static int | |
2980 | semantic_pass_types (systemtap_session& s) | |
2981 | { | |
2982 | int rc = 0; | |
2983 | ||
2984 | // next pass: type inference | |
2985 | unsigned iterations = 0; | |
2986 | typeresolution_info ti (s); | |
57148ee7 | 2987 | |
2b066ec1 FCE |
2988 | ti.assert_resolvability = false; |
2989 | // XXX: maybe convert to exception-based error signalling | |
2990 | while (1) | |
2991 | { | |
49abf162 FCE |
2992 | if (pending_interrupts) break; |
2993 | ||
2b066ec1 | 2994 | iterations ++; |
2b066ec1 FCE |
2995 | ti.num_newly_resolved = 0; |
2996 | ti.num_still_unresolved = 0; | |
2997 | ||
f76427a2 | 2998 | for (map<string,functiondecl*>::iterator it = s.functions.begin(); it != s.functions.end(); it++) |
2b066ec1 | 2999 | { |
49abf162 FCE |
3000 | if (pending_interrupts) break; |
3001 | ||
f76427a2 | 3002 | functiondecl* fd = it->second; |
bdef2583 | 3003 | ti.current_probe = 0; |
f76427a2 | 3004 | ti.current_function = fd; |
8a43522c | 3005 | ti.t = pe_unknown; |
f76427a2 | 3006 | fd->body->visit (& ti); |
8a43522c GH |
3007 | // NB: we don't have to assert a known type for |
3008 | // functions here, to permit a "void" function. | |
3009 | // The translator phase will omit the "retvalue". | |
3010 | // | |
f76427a2 FCE |
3011 | // if (fd->type == pe_unknown) |
3012 | // ti.unresolved (fd->tok); | |
57148ee7 | 3013 | } |
2b066ec1 FCE |
3014 | |
3015 | for (unsigned j=0; j<s.probes.size(); j++) | |
3016 | { | |
49abf162 FCE |
3017 | if (pending_interrupts) break; |
3018 | ||
2b066ec1 FCE |
3019 | derived_probe* pn = s.probes[j]; |
3020 | ti.current_function = 0; | |
bdef2583 | 3021 | ti.current_probe = pn; |
2b066ec1 FCE |
3022 | ti.t = pe_unknown; |
3023 | pn->body->visit (& ti); | |
5d23847d FCE |
3024 | |
3025 | probe_point* pp = pn->sole_location(); | |
3026 | if (pp->condition) | |
3027 | { | |
3028 | ti.current_function = 0; | |
3029 | ti.current_probe = 0; | |
3030 | ti.t = pe_long; // NB: expected type | |
3031 | pp->condition->visit (& ti); | |
3032 | } | |
2b066ec1 FCE |
3033 | } |
3034 | ||
3035 | for (unsigned j=0; j<s.globals.size(); j++) | |
3036 | { | |
3037 | vardecl* gd = s.globals[j]; | |
3038 | if (gd->type == pe_unknown) | |
3039 | ti.unresolved (gd->tok); | |
3040 | } | |
57148ee7 | 3041 | |
2b066ec1 | 3042 | if (ti.num_newly_resolved == 0) // converged |
78f6bba6 FCE |
3043 | { |
3044 | if (ti.num_still_unresolved == 0) | |
3045 | break; // successfully | |
3046 | else if (! ti.assert_resolvability) | |
3047 | ti.assert_resolvability = true; // last pass, with error msgs | |
3048 | else | |
3049 | { // unsuccessful conclusion | |
3050 | rc ++; | |
3051 | break; | |
3052 | } | |
3053 | } | |
2b066ec1 | 3054 | } |
57148ee7 | 3055 | |
7e41d3dc | 3056 | return rc + s.num_errors(); |
2b066ec1 FCE |
3057 | } |
3058 | ||
3059 | ||
bdef2583 FCE |
3060 | |
3061 | typeresolution_info::typeresolution_info (systemtap_session& s): | |
3062 | session(s), current_function(0), current_probe(0) | |
3063 | { | |
3064 | } | |
3065 | ||
3066 | ||
2b066ec1 FCE |
3067 | void |
3068 | typeresolution_info::visit_literal_number (literal_number* e) | |
3069 | { | |
3070 | assert (e->type == pe_long); | |
3071 | if ((t == e->type) || (t == pe_unknown)) | |
3072 | return; | |
3073 | ||
3074 | mismatch (e->tok, e->type, t); | |
3075 | } | |
3076 | ||
3077 | ||
3078 | void | |
3079 | typeresolution_info::visit_literal_string (literal_string* e) | |
3080 | { | |
3081 | assert (e->type == pe_string); | |
3082 | if ((t == e->type) || (t == pe_unknown)) | |
3083 | return; | |
3084 | ||
3085 | mismatch (e->tok, e->type, t); | |
3086 | } | |
3087 | ||
3088 | ||
3089 | void | |
3090 | typeresolution_info::visit_logical_or_expr (logical_or_expr *e) | |
3091 | { | |
3092 | visit_binary_expression (e); | |
3093 | } | |
3094 | ||
3095 | ||
3096 | void | |
3097 | typeresolution_info::visit_logical_and_expr (logical_and_expr *e) | |
3098 | { | |
3099 | visit_binary_expression (e); | |
3100 | } | |
3101 | ||
3102 | ||
3103 | void | |
3104 | typeresolution_info::visit_comparison (comparison *e) | |
3105 | { | |
d5d7c2cc | 3106 | // NB: result of any comparison is an integer! |
553d27a5 FCE |
3107 | if (t == pe_stats || t == pe_string) |
3108 | invalid (e->tok, t); | |
3109 | ||
3110 | t = (e->right->type != pe_unknown) ? e->right->type : pe_unknown; | |
3111 | e->left->visit (this); | |
3112 | t = (e->left->type != pe_unknown) ? e->left->type : pe_unknown; | |
3113 | e->right->visit (this); | |
57148ee7 | 3114 | |
553d27a5 FCE |
3115 | if (e->left->type != pe_unknown && |
3116 | e->right->type != pe_unknown && | |
3117 | e->left->type != e->right->type) | |
3118 | mismatch (e->tok, e->left->type, e->right->type); | |
57148ee7 | 3119 | |
553d27a5 FCE |
3120 | if (e->type == pe_unknown) |
3121 | { | |
3122 | e->type = pe_long; | |
3123 | resolved (e->tok, e->type); | |
3124 | } | |
2b066ec1 FCE |
3125 | } |
3126 | ||
3127 | ||
3128 | void | |
3129 | typeresolution_info::visit_concatenation (concatenation *e) | |
3130 | { | |
553d27a5 FCE |
3131 | if (t != pe_unknown && t != pe_string) |
3132 | invalid (e->tok, t); | |
3133 | ||
3134 | t = pe_string; | |
3135 | e->left->visit (this); | |
3136 | t = pe_string; | |
3137 | e->right->visit (this); | |
3138 | ||
3139 | if (e->type == pe_unknown) | |
3140 | { | |
3141 | e->type = pe_string; | |
3142 | resolved (e->tok, e->type); | |
3143 | } | |
2b066ec1 FCE |
3144 | } |
3145 | ||
3146 | ||
2b066ec1 FCE |
3147 | void |
3148 | typeresolution_info::visit_assignment (assignment *e) | |
3149 | { | |
553d27a5 FCE |
3150 | if (t == pe_stats) |
3151 | invalid (e->tok, t); | |
2b066ec1 | 3152 | |
2b066ec1 FCE |
3153 | if (e->op == "<<<") // stats aggregation |
3154 | { | |
553d27a5 FCE |
3155 | if (t == pe_string) |
3156 | invalid (e->tok, t); | |
3157 | ||
2b066ec1 FCE |
3158 | t = pe_stats; |
3159 | e->left->visit (this); | |
3160 | t = pe_long; | |
3161 | e->right->visit (this); | |
57b73400 GH |
3162 | if (e->type == pe_unknown || |
3163 | e->type == pe_stats) | |
2b066ec1 FCE |
3164 | { |
3165 | e->type = pe_long; | |
3166 | resolved (e->tok, e->type); | |
3167 | } | |
3168 | } | |
57b73400 GH |
3169 | |
3170 | else if (e->left->type == pe_stats) | |
3171 | invalid (e->left->tok, e->left->type); | |
3172 | ||
3173 | else if (e->right->type == pe_stats) | |
3174 | invalid (e->right->tok, e->right->type); | |
3175 | ||
553d27a5 | 3176 | else if (e->op == "+=" || // numeric only |
d5d7c2cc FCE |
3177 | e->op == "-=" || |
3178 | e->op == "*=" || | |
3179 | e->op == "/=" || | |
3180 | e->op == "%=" || | |
3181 | e->op == "&=" || | |
3182 | e->op == "^=" || | |
3183 | e->op == "|=" || | |
3184 | e->op == "<<=" || | |
3185 | e->op == ">>=" || | |
553d27a5 | 3186 | false) |
2b066ec1 | 3187 | { |
553d27a5 | 3188 | visit_binary_expression (e); |
2b066ec1 | 3189 | } |
d5d7c2cc FCE |
3190 | else if (e->op == ".=" || // string only |
3191 | false) | |
3192 | { | |
3193 | if (t == pe_long || t == pe_stats) | |
3194 | invalid (e->tok, t); | |
3195 | ||
3196 | t = pe_string; | |
3197 | e->left->visit (this); | |
3198 | t = pe_string; | |
3199 | e->right->visit (this); | |
3200 | if (e->type == pe_unknown) | |
3201 | { | |
3202 | e->type = pe_string; | |
3203 | resolved (e->tok, e->type); | |
3204 | } | |
3205 | } | |
3206 | else if (e->op == "=") // overloaded = for string & numeric operands | |
2b066ec1 | 3207 | { |
553d27a5 | 3208 | // logic similar to ternary_expression |
2b066ec1 | 3209 | exp_type sub_type = t; |
553d27a5 FCE |
3210 | |
3211 | // Infer types across the l/r values | |
3212 | if (sub_type == pe_unknown && e->type != pe_unknown) | |
2b066ec1 | 3213 | sub_type = e->type; |
553d27a5 FCE |
3214 | |
3215 | t = (sub_type != pe_unknown) ? sub_type : | |
3216 | (e->right->type != pe_unknown) ? e->right->type : | |
3217 | pe_unknown; | |
2b066ec1 | 3218 | e->left->visit (this); |
553d27a5 FCE |
3219 | t = (sub_type != pe_unknown) ? sub_type : |
3220 | (e->left->type != pe_unknown) ? e->left->type : | |
3221 | pe_unknown; | |
2b066ec1 | 3222 | e->right->visit (this); |
57148ee7 | 3223 | |
553d27a5 | 3224 | if ((sub_type != pe_unknown) && (e->type == pe_unknown)) |
2b066ec1 FCE |
3225 | { |
3226 | e->type = sub_type; | |
3227 | resolved (e->tok, e->type); | |
3228 | } | |
553d27a5 | 3229 | if ((sub_type == pe_unknown) && (e->left->type != pe_unknown)) |
2b066ec1 FCE |
3230 | { |
3231 | e->type = e->left->type; | |
3232 | resolved (e->tok, e->type); | |
3233 | } | |
553d27a5 FCE |
3234 | |
3235 | if (e->left->type != pe_unknown && | |
3236 | e->right->type != pe_unknown && | |
3237 | e->left->type != e->right->type) | |
3238 | mismatch (e->tok, e->left->type, e->right->type); | |
d02548c0 | 3239 | |
553d27a5 | 3240 | } |
d5d7c2cc FCE |
3241 | else |
3242 | throw semantic_error ("unsupported assignment operator " + e->op); | |
553d27a5 FCE |
3243 | } |
3244 | ||
3245 | ||
3246 | void | |
3247 | typeresolution_info::visit_binary_expression (binary_expression* e) | |
3248 | { | |
3249 | if (t == pe_stats || t == pe_string) | |
3250 | invalid (e->tok, t); | |
3251 | ||
3252 | t = pe_long; | |
3253 | e->left->visit (this); | |
3254 | t = pe_long; | |
3255 | e->right->visit (this); | |
3256 | ||
3257 | if (e->left->type != pe_unknown && | |
3258 | e->right->type != pe_unknown && | |
3259 | e->left->type != e->right->type) | |
3260 | mismatch (e->tok, e->left->type, e->right->type); | |
57148ee7 | 3261 | |
553d27a5 FCE |
3262 | if (e->type == pe_unknown) |
3263 | { | |
3264 | e->type = pe_long; | |
3265 | resolved (e->tok, e->type); | |
2b066ec1 FCE |
3266 | } |
3267 | } | |
3268 | ||
3269 | ||
3270 | void | |
3271 | typeresolution_info::visit_pre_crement (pre_crement *e) | |
3272 | { | |
3273 | visit_unary_expression (e); | |
3274 | } | |
3275 | ||
3276 | ||
3277 | void | |
3278 | typeresolution_info::visit_post_crement (post_crement *e) | |
3279 | { | |
3280 | visit_unary_expression (e); | |
3281 | } | |
3282 | ||
3283 | ||
3284 | void | |
3285 | typeresolution_info::visit_unary_expression (unary_expression* e) | |
3286 | { | |
553d27a5 FCE |
3287 | if (t == pe_stats || t == pe_string) |
3288 | invalid (e->tok, t); | |
3289 | ||
2b066ec1 FCE |
3290 | t = pe_long; |
3291 | e->operand->visit (this); | |
3292 | ||
553d27a5 | 3293 | if (e->type == pe_unknown) |
2b066ec1 FCE |
3294 | { |
3295 | e->type = pe_long; | |
3296 | resolved (e->tok, e->type); | |
3297 | } | |
3298 | } | |
3299 | ||
3300 | ||
2b066ec1 FCE |
3301 | void |
3302 | typeresolution_info::visit_ternary_expression (ternary_expression* e) | |
3303 | { | |
3304 | exp_type sub_type = t; | |
3305 | ||
3306 | t = pe_long; | |
3307 | e->cond->visit (this); | |
3308 | ||
553d27a5 | 3309 | // Infer types across the true/false arms of the ternary expression. |
2b066ec1 FCE |
3310 | |
3311 | if (sub_type == pe_unknown && e->type != pe_unknown) | |
3312 | sub_type = e->type; | |
3313 | t = sub_type; | |
3314 | e->truevalue->visit (this); | |
3315 | t = sub_type; | |
3316 | e->falsevalue->visit (this); | |
3317 | ||
3318 | if ((sub_type == pe_unknown) && (e->type != pe_unknown)) | |
3319 | ; // already resolved | |
3320 | else if ((sub_type != pe_unknown) && (e->type == pe_unknown)) | |
3321 | { | |
3322 | e->type = sub_type; | |
3323 | resolved (e->tok, e->type); | |
3324 | } | |
3325 | else if ((sub_type == pe_unknown) && (e->truevalue->type != pe_unknown)) | |
3326 | { | |
3327 | e->type = e->truevalue->type; | |
3328 | resolved (e->tok, e->type); | |
3329 | } | |
3330 | else if ((sub_type == pe_unknown) && (e->falsevalue->type != pe_unknown)) | |
3331 | { | |
3332 | e->type = e->falsevalue->type; | |
3333 | resolved (e->tok, e->type); | |
3334 | } | |
3335 | else if (e->type != sub_type) | |
3336 | mismatch (e->tok, sub_type, e->type); | |
3337 | } | |
3338 | ||
3339 | ||
3340 | template <class Referrer, class Referent> | |
3341 | void resolve_2types (Referrer* referrer, Referent* referent, | |
31966088 | 3342 | typeresolution_info* r, exp_type t, bool accept_unknown = false) |
2b066ec1 FCE |
3343 | { |
3344 | exp_type& re_type = referrer->type; | |
3345 | const token* re_tok = referrer->tok; | |
3346 | exp_type& te_type = referent->type; | |
3347 | const token* te_tok = referent->tok; | |
3348 | ||
3349 | if (t != pe_unknown && re_type == t && re_type == te_type) | |
3350 | ; // do nothing: all three e->types in agreement | |
3351 | else if (t == pe_unknown && re_type != pe_unknown && re_type == te_type) | |
3352 | ; // do nothing: two known e->types in agreement | |
3353 | else if (re_type != pe_unknown && te_type != pe_unknown && re_type != te_type) | |
3354 | r->mismatch (re_tok, re_type, te_type); | |
3355 | else if (re_type != pe_unknown && t != pe_unknown && re_type != t) | |
3356 | r->mismatch (re_tok, re_type, t); | |
3357 | else if (te_type != pe_unknown && t != pe_unknown && te_type != t) | |
3358 | r->mismatch (te_tok, te_type, t); | |
3359 | else if (re_type == pe_unknown && t != pe_unknown) | |
3360 | { | |
3361 | // propagate from upstream | |
3362 | re_type = t; | |
3363 | r->resolved (re_tok, re_type); | |
3364 | // catch re_type/te_type mismatch later | |
3365 | } | |
3366 | else if (re_type == pe_unknown && te_type != pe_unknown) | |
3367 | { | |
3368 | // propagate from referent | |
3369 | re_type = te_type; | |
3370 | r->resolved (re_tok, re_type); | |
3371 | // catch re_type/t mismatch later | |
3372 | } | |
3373 | else if (re_type != pe_unknown && te_type == pe_unknown) | |
3374 | { | |
3375 | // propagate to referent | |
3376 | te_type = re_type; | |
3377 | r->resolved (te_tok, te_type); | |
3378 | // catch re_type/t mismatch later | |
3379 | } | |
31966088 | 3380 | else if (! accept_unknown) |
2b066ec1 FCE |
3381 | r->unresolved (re_tok); |
3382 | } | |
3383 | ||
3384 | ||
3385 | void | |
3386 | typeresolution_info::visit_symbol (symbol* e) | |
3387 | { | |
3388 | assert (e->referent != 0); | |
d02548c0 | 3389 | resolve_2types (e, e->referent, this, t); |
2b066ec1 FCE |
3390 | } |
3391 | ||
3392 | ||
d7f3e0c5 GH |
3393 | void |
3394 | typeresolution_info::visit_target_symbol (target_symbol* e) | |
3395 | { | |
3e3bd7b6 JS |
3396 | if (!e->probe_context_var.empty()) |
3397 | return; | |
3398 | ||
cbfbbf69 FCE |
3399 | // This occurs only if a target symbol was not resolved over in |
3400 | // tapset.cxx land, that error was properly suppressed, and the | |
3401 | // later unused-expression-elimination pass didn't get rid of it | |
3402 | // either. So we have a target symbol that is believed to be of | |
3403 | // genuine use, yet unresolved by the provider. | |
ba6f838d FCE |
3404 | |
3405 | if (session.verbose > 2) | |
3406 | { | |
3407 | clog << "Resolution problem with "; | |
3408 | if (current_function) | |
3409 | { | |
3410 | clog << "function " << current_function->name << endl; | |
3411 | current_function->body->print (clog); | |
3412 | clog << endl; | |
3413 | } | |
3414 | else if (current_probe) | |
3415 | { | |
3416 | clog << "probe " << current_probe->name << endl; | |
3417 | current_probe->body->print (clog); | |
3418 | clog << endl; | |
3419 | } | |
57148ee7 | 3420 | else |
ba6f838d FCE |
3421 | clog << "other" << endl; |
3422 | } | |
3423 | ||
9b48ce88 FCE |
3424 | if (e->saved_conversion_error) |
3425 | throw (* (e->saved_conversion_error)); | |
3426 | else | |
3427 | throw semantic_error("unresolved target-symbol expression", e->tok); | |
d7f3e0c5 GH |
3428 | } |
3429 | ||
3430 | ||
9b5af295 JS |
3431 | void |
3432 | typeresolution_info::visit_cast_op (cast_op* e) | |
3433 | { | |
3434 | // Like target_symbol, a cast_op shouldn't survive this far | |
3435 | // unless it was not resolved and its value is really needed. | |
3436 | if (e->saved_conversion_error) | |
3437 | throw (* (e->saved_conversion_error)); | |
3438 | else | |
3439 | throw semantic_error("unresolved cast expression", e->tok); | |
3440 | } | |
3441 | ||
3442 | ||
2b066ec1 FCE |
3443 | void |
3444 | typeresolution_info::visit_arrayindex (arrayindex* e) | |
3445 | { | |
2b066ec1 | 3446 | |
d02548c0 GH |
3447 | symbol *array = NULL; |
3448 | hist_op *hist = NULL; | |
3449 | classify_indexable(e->base, array, hist); | |
57148ee7 | 3450 | |
d02548c0 GH |
3451 | // Every hist_op has type [int]:int, that is to say, every hist_op |
3452 | // is a pseudo-one-dimensional integer array type indexed by | |
3453 | // integers (bucket numbers). | |
3454 | ||
3455 | if (hist) | |
3456 | { | |
3457 | if (e->indexes.size() != 1) | |
3458 | unresolved (e->tok); | |
3459 | t = pe_long; | |
3460 | e->indexes[0]->visit (this); | |
3461 | if (e->indexes[0]->type != pe_long) | |
3462 | unresolved (e->tok); | |
a4636912 | 3463 | hist->visit (this); |
1bbeef03 GH |
3464 | if (e->type != pe_long) |
3465 | { | |
3466 | e->type = pe_long; | |
3467 | resolved (e->tok, pe_long); | |
3468 | } | |
d02548c0 GH |
3469 | return; |
3470 | } | |
3471 | ||
3472 | // Now we are left with "normal" map inference and index checking. | |
3473 | ||
3474 | assert (array); | |
3475 | assert (array->referent != 0); | |
3476 | resolve_2types (e, array->referent, this, t); | |
2b066ec1 FCE |
3477 | |
3478 | // now resolve the array indexes | |
69c68955 FCE |
3479 | |
3480 | // if (e->referent->index_types.size() == 0) | |
3481 | // // redesignate referent as array | |
3482 | // e->referent->set_arity (e->indexes.size ()); | |
2b066ec1 | 3483 | |
d02548c0 | 3484 | if (e->indexes.size() != array->referent->index_types.size()) |
2b066ec1 FCE |
3485 | unresolved (e->tok); // symbol resolution should prevent this |
3486 | else for (unsigned i=0; i<e->indexes.size(); i++) | |
3487 | { | |
3488 | expression* ee = e->indexes[i]; | |
d02548c0 | 3489 | exp_type& ft = array->referent->index_types [i]; |
2b066ec1 FCE |
3490 | t = ft; |
3491 | ee->visit (this); | |
3492 | exp_type at = ee->type; | |
3493 | ||
3494 | if ((at == pe_string || at == pe_long) && ft == pe_unknown) | |
3495 | { | |
3496 | // propagate to formal type | |
3497 | ft = at; | |
d02548c0 | 3498 | resolved (array->referent->tok, ft); |
2b066ec1 FCE |
3499 | // uses array decl as there is no token for "formal type" |
3500 | } | |
3501 | if (at == pe_stats) | |
3502 | invalid (ee->tok, at); | |
3503 | if (ft == pe_stats) | |
3504 | invalid (ee->tok, ft); | |
3505 | if (at != pe_unknown && ft != pe_unknown && ft != at) | |
3506 | mismatch (e->tok, at, ft); | |
3507 | if (at == pe_unknown) | |
313b2f74 | 3508 | unresolved (ee->tok); |
2b066ec1 FCE |
3509 | } |
3510 | } | |
3511 | ||
3512 | ||
3513 | void | |
3514 | typeresolution_info::visit_functioncall (functioncall* e) | |
3515 | { | |
3516 | assert (e->referent != 0); | |
3517 | ||
57148ee7 | 3518 | resolve_2types (e, e->referent, this, t, true); // accept unknown type |
2b066ec1 FCE |
3519 | |
3520 | if (e->type == pe_stats) | |
3521 | invalid (e->tok, e->type); | |
3522 | ||
2b066ec1 FCE |
3523 | // now resolve the function parameters |
3524 | if (e->args.size() != e->referent->formal_args.size()) | |
3525 | unresolved (e->tok); // symbol resolution should prevent this | |
3526 | else for (unsigned i=0; i<e->args.size(); i++) | |
3527 | { | |
3528 | expression* ee = e->args[i]; | |
3529 | exp_type& ft = e->referent->formal_args[i]->type; | |
3530 | const token* fe_tok = e->referent->formal_args[i]->tok; | |
3531 | t = ft; | |
3532 | ee->visit (this); | |
3533 | exp_type at = ee->type; | |
57148ee7 | 3534 | |
2b066ec1 FCE |
3535 | if (((at == pe_string) || (at == pe_long)) && ft == pe_unknown) |
3536 | { | |
3537 | // propagate to formal arg | |
3538 | ft = at; | |
3539 | resolved (e->referent->formal_args[i]->tok, ft); | |
3540 | } | |
3541 | if (at == pe_stats) | |
3542 | invalid (e->tok, at); | |
3543 | if (ft == pe_stats) | |
3544 | invalid (fe_tok, ft); | |
3545 | if (at != pe_unknown && ft != pe_unknown && ft != at) | |
3546 | mismatch (e->tok, at, ft); | |
3547 | if (at == pe_unknown) | |
3548 | unresolved (e->tok); | |
3549 | } | |
3550 | } | |
3551 | ||
3552 | ||
3553 | void | |
3554 | typeresolution_info::visit_block (block* e) | |
3555 | { | |
3556 | for (unsigned i=0; i<e->statements.size(); i++) | |
3557 | { | |
57148ee7 | 3558 | try |
2b066ec1 FCE |
3559 | { |
3560 | t = pe_unknown; | |
3561 | e->statements[i]->visit (this); | |
3562 | } | |
3563 | catch (const semantic_error& e) | |
3564 | { | |
3565 | session.print_error (e); | |
3566 | } | |
3567 | } | |
3568 | } | |
3569 | ||
3570 | ||
54dfabe9 | 3571 | void |
78f6bba6 | 3572 | typeresolution_info::visit_embeddedcode (embeddedcode*) |
54dfabe9 FCE |
3573 | { |
3574 | } | |
3575 | ||
3576 | ||
2b066ec1 FCE |
3577 | void |
3578 | typeresolution_info::visit_if_statement (if_statement* e) | |
3579 | { | |
3580 | t = pe_long; | |
3581 | e->condition->visit (this); | |
3582 | ||
3583 | t = pe_unknown; | |
3584 | e->thenblock->visit (this); | |
3585 | ||
3586 | if (e->elseblock) | |
3587 | { | |
3588 | t = pe_unknown; | |
3589 | e->elseblock->visit (this); | |
3590 | } | |
3591 | } | |
3592 | ||
3593 | ||
3594 | void | |
3595 | typeresolution_info::visit_for_loop (for_loop* e) | |
3596 | { | |
3597 | t = pe_unknown; | |
cbfbbf69 | 3598 | if (e->init) e->init->visit (this); |
2b066ec1 FCE |
3599 | t = pe_long; |
3600 | e->cond->visit (this); | |
3601 | t = pe_unknown; | |
57148ee7 | 3602 | if (e->incr) e->incr->visit (this); |
2b066ec1 | 3603 | t = pe_unknown; |
57148ee7 | 3604 | e->block->visit (this); |
2b066ec1 FCE |
3605 | } |
3606 | ||
3607 | ||
69c68955 FCE |
3608 | void |
3609 | typeresolution_info::visit_foreach_loop (foreach_loop* e) | |
3610 | { | |
3611 | // See also visit_arrayindex. | |
3612 | // This is different in that, being a statement, we can't assign | |
3613 | // a type to the outer array, only propagate to/from the indexes | |
3614 | ||
3615 | // if (e->referent->index_types.size() == 0) | |
3616 | // // redesignate referent as array | |
3617 | // e->referent->set_arity (e->indexes.size ()); | |
3618 | ||
d02548c0 GH |
3619 | symbol *array = NULL; |
3620 | hist_op *hist = NULL; | |
3621 | classify_indexable(e->base, array, hist); | |
69c68955 | 3622 | |
d02548c0 | 3623 | if (hist) |
57148ee7 | 3624 | { |
d02548c0 GH |
3625 | if (e->indexes.size() != 1) |
3626 | unresolved (e->tok); | |
3627 | t = pe_long; | |
3628 | e->indexes[0]->visit (this); | |
3629 | if (e->indexes[0]->type != pe_long) | |
3630 | unresolved (e->tok); | |
a4636912 | 3631 | hist->visit (this); |
d02548c0 GH |
3632 | } |
3633 | else | |
3634 | { | |
57148ee7 | 3635 | assert (array); |
d02548c0 GH |
3636 | if (e->indexes.size() != array->referent->index_types.size()) |
3637 | unresolved (e->tok); // symbol resolution should prevent this | |
3638 | else for (unsigned i=0; i<e->indexes.size(); i++) | |
3639 | { | |
3640 | expression* ee = e->indexes[i]; | |
3641 | exp_type& ft = array->referent->index_types [i]; | |
3642 | t = ft; | |
3643 | ee->visit (this); | |
3644 | exp_type at = ee->type; | |
57148ee7 | 3645 | |
d02548c0 GH |
3646 | if ((at == pe_string || at == pe_long) && ft == pe_unknown) |
3647 | { | |
3648 | // propagate to formal type | |
3649 | ft = at; | |
3650 | resolved (array->referent->tok, ft); | |
3651 | // uses array decl as there is no token for "formal type" | |
3652 | } | |
3653 | if (at == pe_stats) | |
3654 | invalid (ee->tok, at); | |
3655 | if (ft == pe_stats) | |
3656 | invalid (ee->tok, ft); | |
3657 | if (at != pe_unknown && ft != pe_unknown && ft != at) | |
3658 | mismatch (e->tok, at, ft); | |
3659 | if (at == pe_unknown) | |
3660 | unresolved (ee->tok); | |
3661 | } | |
69c68955 FCE |
3662 | } |
3663 | ||
27f21e8c DS |
3664 | if (e->limit) |
3665 | { | |
3666 | t = pe_long; | |
3667 | e->limit->visit (this); | |
3668 | } | |
3669 | ||
69c68955 | 3670 | t = pe_unknown; |
57148ee7 | 3671 | e->block->visit (this); |
69c68955 FCE |
3672 | } |
3673 | ||
3674 | ||
2b066ec1 | 3675 | void |
78f6bba6 | 3676 | typeresolution_info::visit_null_statement (null_statement*) |
2b066ec1 FCE |
3677 | { |
3678 | } | |
3679 | ||
3680 | ||
3681 | void | |
3682 | typeresolution_info::visit_expr_statement (expr_statement* e) | |
3683 | { | |
3684 | t = pe_unknown; | |
3685 | e->value->visit (this); | |
3686 | } | |
3687 | ||
3688 | ||
57148ee7 | 3689 | struct delete_statement_typeresolution_info: |
d98d459c GH |
3690 | public throwing_visitor |
3691 | { | |
3692 | typeresolution_info *parent; | |
3693 | delete_statement_typeresolution_info (typeresolution_info *p): | |
3694 | throwing_visitor ("invalid operand of delete expression"), | |
3695 | parent (p) | |
3696 | {} | |
3697 | ||
3698 | void visit_arrayindex (arrayindex* e) | |
3699 | { | |
3700 | parent->visit_arrayindex (e); | |
3701 | } | |
57148ee7 | 3702 | |
d98d459c GH |
3703 | void visit_symbol (symbol* e) |
3704 | { | |
3705 | exp_type ignored = pe_unknown; | |
57148ee7 | 3706 | assert (e->referent != 0); |
d98d459c GH |
3707 | resolve_2types (e, e->referent, parent, ignored); |
3708 | } | |
3709 | }; | |
3710 | ||
3711 | ||
2b066ec1 FCE |
3712 | void |
3713 | typeresolution_info::visit_delete_statement (delete_statement* e) | |
3714 | { | |
d98d459c GH |
3715 | delete_statement_typeresolution_info di (this); |
3716 | t = pe_unknown; | |
3717 | e->value->visit (&di); | |
2b066ec1 FCE |
3718 | } |
3719 | ||
3720 | ||
f3c26ea5 | 3721 | void |
78f6bba6 | 3722 | typeresolution_info::visit_next_statement (next_statement*) |
f3c26ea5 FCE |
3723 | { |
3724 | } | |
3725 | ||
3726 | ||
3727 | void | |
78f6bba6 | 3728 | typeresolution_info::visit_break_statement (break_statement*) |
f3c26ea5 FCE |
3729 | { |
3730 | } | |
3731 | ||
3732 | ||
3733 | void | |
78f6bba6 | 3734 | typeresolution_info::visit_continue_statement (continue_statement*) |
f3c26ea5 FCE |
3735 | { |
3736 | } | |
3737 | ||
3738 | ||
2b066ec1 FCE |
3739 | void |
3740 | typeresolution_info::visit_array_in (array_in* e) | |
3741 | { | |
ce10591c FCE |
3742 | // all unary operators only work on numerics |
3743 | exp_type t1 = t; | |
3744 | t = pe_unknown; // array value can be anything | |
3745 | e->operand->visit (this); | |
3746 | ||
3747 | if (t1 == pe_unknown && e->type != pe_unknown) | |
3748 | ; // already resolved | |
3749 | else if (t1 == pe_string || t1 == pe_stats) | |
3750 | mismatch (e->tok, t1, pe_long); | |
3751 | else if (e->type == pe_unknown) | |
3752 | { | |
3753 | e->type = pe_long; | |
3754 | resolved (e->tok, e->type); | |
3755 | } | |
2b066ec1 FCE |
3756 | } |
3757 | ||
3758 | ||
3759 | void | |
3760 | typeresolution_info::visit_return_statement (return_statement* e) | |
3761 | { | |
3762 | // This is like symbol, where the referent is | |
3763 | // the return value of the function. | |
3764 | ||
57148ee7 | 3765 | // translation pass will print error |
2b066ec1 | 3766 | if (current_function == 0) |
22f46231 | 3767 | return; |
2b066ec1 FCE |
3768 | |
3769 | exp_type& e_type = current_function->type; | |
3770 | t = current_function->type; | |
3771 | e->value->visit (this); | |
3772 | ||
3773 | if (e_type != pe_unknown && e->value->type != pe_unknown | |
3774 | && e_type != e->value->type) | |
3775 | mismatch (current_function->tok, e_type, e->value->type); | |
57148ee7 | 3776 | if (e_type == pe_unknown && |
2b066ec1 FCE |
3777 | (e->value->type == pe_long || e->value->type == pe_string)) |
3778 | { | |
3779 | // propagate non-statistics from value | |
3780 | e_type = e->value->type; | |
3781 | resolved (current_function->tok, e->value->type); | |
3782 | } | |
3783 | if (e->value->type == pe_stats) | |
3784 | invalid (e->value->tok, e->value->type); | |
3785 | } | |
3786 | ||
57148ee7 | 3787 | void |
d02548c0 GH |
3788 | typeresolution_info::visit_print_format (print_format* e) |
3789 | { | |
3790 | size_t unresolved_args = 0; | |
3791 | ||
1bbeef03 GH |
3792 | if (e->hist) |
3793 | { | |
3794 | e->hist->visit(this); | |
3795 | } | |
3796 | ||
3797 | else if (e->print_with_format) | |
d02548c0 GH |
3798 | { |
3799 | // If there's a format string, we can do both inference *and* | |
3800 | // checking. | |
3801 | ||
3802 | // First we extract the subsequence of formatting components | |
3803 | // which are conversions (not just literal string components) | |
3804 | ||
34201621 | 3805 | unsigned expected_num_args = 0; |
d02548c0 GH |
3806 | std::vector<print_format::format_component> components; |
3807 | for (size_t i = 0; i < e->components.size(); ++i) | |
3808 | { | |
3809 | if (e->components[i].type == print_format::conv_unspecified) | |
3810 | throw semantic_error ("Unspecified conversion in print operator format string", | |
3811 | e->tok); | |
b5852334 | 3812 | else if (e->components[i].type == print_format::conv_literal) |
d02548c0 GH |
3813 | continue; |
3814 | components.push_back(e->components[i]); | |
34201621 DB |
3815 | ++expected_num_args; |
3816 | if (e->components[i].widthtype == print_format::width_dynamic) | |
3817 | ++expected_num_args; | |
3818 | if (e->components[i].prectype == print_format::prec_dynamic) | |
3819 | ++expected_num_args; | |
d02548c0 GH |
3820 | } |
3821 | ||
3822 | // Then we check that the number of conversions and the number | |
3823 | // of args agree. | |
3824 | ||
34201621 | 3825 | if (expected_num_args != e->args.size()) |
d02548c0 GH |
3826 | throw semantic_error ("Wrong number of args to formatted print operator", |
3827 | e->tok); | |
3828 | ||
3829 | // Then we check that the types of the conversions match the types | |
3830 | // of the args. | |
34201621 | 3831 | unsigned argno = 0; |
d02548c0 GH |
3832 | for (size_t i = 0; i < components.size(); ++i) |
3833 | { | |
34201621 DB |
3834 | // Check the dynamic width, if specified |
3835 | if (components[i].widthtype == print_format::width_dynamic) | |
3836 | { | |
3837 | check_arg_type (pe_long, e->args[argno]); | |
3838 | ++argno; | |
3839 | } | |
3840 | ||
3841 | // Check the dynamic precision, if specified | |
3842 | if (components[i].prectype == print_format::prec_dynamic) | |
3843 | { | |
3844 | check_arg_type (pe_long, e->args[argno]); | |
3845 | ++argno; | |
3846 | } | |
3847 | ||
d02548c0 GH |
3848 | exp_type wanted = pe_unknown; |
3849 | ||
3850 | switch (components[i].type) | |
3851 | { | |
d02548c0 GH |
3852 | case print_format::conv_unspecified: |
3853 | case print_format::conv_literal: | |
3854 | assert (false); | |
3855 | break; | |
3856 | ||
3857 | case print_format::conv_signed_decimal: | |
3858 | case print_format::conv_unsigned_decimal: | |
3859 | case print_format::conv_unsigned_octal: | |
58cf0567 | 3860 | case print_format::conv_unsigned_ptr: |
d02548c0 GH |
3861 | case print_format::conv_unsigned_uppercase_hex: |
3862 | case print_format::conv_unsigned_lowercase_hex: | |
dc0b623a | 3863 | case print_format::conv_binary: |
fecccf83 | 3864 | case print_format::conv_char: |
ec03bd4b | 3865 | case print_format::conv_memory: |
30c94a80 | 3866 | case print_format::conv_memory_hex: |
d02548c0 GH |
3867 | wanted = pe_long; |
3868 | break; | |
3869 | ||
3870 | case print_format::conv_string: | |
3871 | wanted = pe_string; | |
3872 | break; | |
3873 | } | |
3874 | ||
3875 | assert (wanted != pe_unknown); | |
34201621 DB |
3876 | check_arg_type (wanted, e->args[argno]); |
3877 | ++argno; | |
d02548c0 GH |
3878 | } |
3879 | } | |
3880 | else | |
3881 | { | |
3882 | // Without a format string, the best we can do is require that | |
3883 | // each argument resolve to a concrete type. | |
3884 | for (size_t i = 0; i < e->args.size(); ++i) | |
3885 | { | |
3886 | t = pe_unknown; | |
3887 | e->args[i]->visit (this); | |
3888 | if (e->args[i]->type == pe_unknown) | |
3889 | { | |
3890 | unresolved (e->args[i]->tok); | |
3891 | ++unresolved_args; | |
3892 | } | |
3893 | } | |
3894 | } | |
57148ee7 | 3895 | |
d02548c0 GH |
3896 | if (unresolved_args == 0) |
3897 | { | |
3898 | if (e->type == pe_unknown) | |
3899 | { | |
3900 | if (e->print_to_stream) | |
3901 | e->type = pe_long; | |
3902 | else | |
57148ee7 | 3903 | e->type = pe_string; |
d02548c0 GH |
3904 | resolved (e->tok, e->type); |
3905 | } | |
3906 | } | |
3907 | else | |
3908 | { | |
3909 | e->type = pe_unknown; | |
3910 | unresolved (e->tok); | |
3911 | } | |
3912 | } | |
3913 | ||
3914 | ||
57148ee7 | 3915 | void |
d02548c0 GH |
3916 | typeresolution_info::visit_stat_op (stat_op* e) |
3917 | { | |
3918 | t = pe_stats; | |
3919 | e->stat->visit (this); | |
3920 | if (e->type == pe_unknown) | |
3921 | { | |
3922 | e->type = pe_long; | |
3923 | resolved (e->tok, e->type); | |
3924 | } | |
07c17d67 | 3925 | else if (e->type != pe_long) |
d02548c0 GH |
3926 | mismatch (e->tok, e->type, pe_long); |
3927 | } | |
3928 | ||
57148ee7 | 3929 | void |
d02548c0 GH |
3930 | typeresolution_info::visit_hist_op (hist_op* e) |
3931 | { | |
3932 | t = pe_stats; | |
3933 | e->stat->visit (this); | |
3934 | } | |
3935 | ||
2b066ec1 | 3936 | |
34201621 DB |
3937 | void |
3938 | typeresolution_info::check_arg_type (exp_type wanted, expression* arg) | |
3939 | { | |
3940 | t = wanted; | |
3941 | arg->visit (this); | |
3942 | ||
3943 | if (arg->type == pe_unknown) | |
3944 | { | |
3945 | arg->type = wanted; | |
3946 | resolved (arg->tok, wanted); | |
3947 | } | |
3948 | else if (arg->type != wanted) | |
3949 | { | |
3950 | mismatch (arg->tok, arg->type, wanted); | |
3951 | } | |
3952 | } | |
3953 | ||
3954 | ||
2b066ec1 FCE |
3955 | void |
3956 | typeresolution_info::unresolved (const token* tok) | |
3957 | { | |
3958 | num_still_unresolved ++; | |
3959 | ||
3960 | if (assert_resolvability) | |
3961 | { | |
6c543717 | 3962 | stringstream msg; |
bdef2583 FCE |
3963 | string nm = (current_function ? current_function->name : |
3964 | current_probe ? current_probe->name : | |
5d23847d | 3965 | "probe condition"); |
6c543717 FCE |
3966 | msg << nm + " with unresolved type"; |
3967 | session.print_error (semantic_error (msg.str(), tok)); | |
2b066ec1 FCE |
3968 | } |
3969 | } | |
3970 | ||
3971 | ||
3972 | void | |
3973 | typeresolution_info::invalid (const token* tok, exp_type pe) | |
3974 | { | |
3975 | num_still_unresolved ++; | |
3976 | ||
3977 | if (assert_resolvability) | |
3978 | { | |
6c543717 | 3979 | stringstream msg; |
bdef2583 FCE |
3980 | string nm = (current_function ? current_function->name : |
3981 | current_probe ? current_probe->name : | |
5d23847d | 3982 | "probe condition"); |
022b623f | 3983 | if (tok && tok->type == tok_operator) |
6c543717 | 3984 | msg << nm + " uses invalid operator"; |
2b066ec1 | 3985 | else |
6c543717 FCE |
3986 | msg << nm + " with invalid type " << pe; |
3987 | session.print_error (semantic_error (msg.str(), tok)); | |
2b066ec1 FCE |
3988 | } |
3989 | } | |
3990 | ||
3991 | ||
3992 | void | |
3993 | typeresolution_info::mismatch (const token* tok, exp_type t1, exp_type t2) | |
3994 | { | |
d784c94d | 3995 | bool tok_resolved = false; |
d5f0c423 RA |
3996 | size_t i; |
3997 | semantic_error* err1 = 0; | |
2b066ec1 FCE |
3998 | num_still_unresolved ++; |
3999 | ||
d5f0c423 RA |
4000 | //BZ 9719: for improving type mismatch messages, a semantic error is |
4001 | //generated with the token where type was first resolved. All such | |
4002 | //resolved tokens, stored in a vector, are matched against their | |
4003 | //content. If an error for the matching token hasn't been printed out | |
4004 | //already, it is and the token pushed in another printed_toks vector | |
4005 | ||
2b066ec1 FCE |
4006 | if (assert_resolvability) |
4007 | { | |
6c543717 | 4008 | stringstream msg; |
d5f0c423 RA |
4009 | for (i=0; i<resolved_toks.size(); i++) |
4010 | { | |
4011 | if (resolved_toks[i]->content == tok->content) | |
4012 | { | |
4013 | tok_resolved = true; | |
4014 | break; | |
4015 | } | |
4016 | } | |
4017 | if (!tok_resolved) | |
4018 | { | |
4019 | string nm = (current_function ? current_function->name : | |
4020 | current_probe ? current_probe->name : | |
4021 | "probe condition"); | |
4022 | msg << nm + " with type mismatch (" << t1 << " vs. " << t2 << ")"; | |
4023 | } | |
4024 | else | |
4025 | { | |
d784c94d | 4026 | bool tok_printed = false; |
d5f0c423 RA |
4027 | for (size_t j=0; j<printed_toks.size(); j++) |
4028 | { | |
4029 | if (printed_toks[j] == resolved_toks[i]) | |
4030 | { | |
4031 | tok_printed = true; | |
4032 | break; | |
4033 | } | |
4034 | } | |
4035 | string nm = (current_function ? current_function->name : | |
4036 | current_probe ? current_probe->name : | |
4037 | "probe condition"); | |
4038 | msg << nm + " with type mismatch (" << t1 << " vs. " << t2 << ")"; | |
4039 | if (!tok_printed) | |
4040 | { | |
4041 | //error for possible mismatch in the earlier resolved token | |
4042 | printed_toks.push_back (resolved_toks[i]); | |
4043 | stringstream type_msg; | |
4044 | type_msg << nm + " type first inferred here (" << t2 << ")"; | |
4045 | err1 = new semantic_error (type_msg.str(), resolved_toks[i]); | |
4046 | } | |
4047 | } | |
4048 | semantic_error err (msg.str(), tok); | |
4049 | err.chain = err1; | |
4050 | session.print_error (err); | |
2b066ec1 FCE |
4051 | } |
4052 | } | |
4053 | ||
4054 | ||
4055 | void | |
d5f0c423 | 4056 | typeresolution_info::resolved (const token* tok, exp_type) |
2b066ec1 | 4057 | { |
d5f0c423 | 4058 | resolved_toks.push_back (tok); |
2b066ec1 | 4059 | num_newly_resolved ++; |
2b066ec1 FCE |
4060 | } |
4061 | ||
73267b89 | 4062 | /* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */ |