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Re: [PATCH] libdw: Make dwarf_getfuncs find all (defining) DW_TAG_subprogram DIEs.
- From: Mark Wielaard <mjw at redhat dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Fri, 20 Sep 2013 15:55:07 +0200
- Subject: Re: [PATCH] libdw: Make dwarf_getfuncs find all (defining) DW_TAG_subprogram DIEs.
Hi Josh,
On Thu, 2013-09-19 at 18:42 -0700, Josh Stone wrote:
> With systemtap-debuginfo-2.3-1.fc19.x86_64, my patched stap.git found
> 75713 probes in 'process("/usr/bin/stap").function("*")' (as counted by
> the pass-2 -v line). Unpatched stap.git with your patched elfutils.git
> found only 61056 probes. :(
The attached patch fixes the partial/imported unit issue you found.
Which actually made the implementation simpler. I also added some
comments to the libdw.h dwarf_getfuncs documentation.
But it still doesn't seem to find as many probes as you do:
Pass 2: analyzed script: 72231 probe(s) [...]
Of course this does much more than just finding the defining
subprograms. So we might not be comparing the exact same thing. Could
you post you systemtap patch somewhere? I am just using the packaged
systemtap-2.3-1.fc19.x86_64 on itself with LD_LIBRARY_PATH pointing to a
elfutils git build with the below patch.
Thanks,
Mark
>From a2d0564bc4bb7b5e8fb14d532af91080abffe7ff Mon Sep 17 00:00:00 2001
From: Mark Wielaard <mjw@redhat.com>
Date: Fri, 20 Sep 2013 09:50:42 -0400
Subject: [PATCH] libdw: Make dwarf_getfuncs find all (defining)
DW_TAG_subprogram DIEs.
dwarf_getfuncs used to return only the DW_TAG_subprogram DIEs that were
direct children of the given CU. This is normally how GCC outputs the
subprogram DIEs. But not always. For nested functions the subprogram DIE
is placed under the subprogram DIE where it is nested. Other compilers
might output the defining subprogram DIE of a C++ class function under
the DW_TAG_namespace DIE where it was defined. Both such constructs seem
allowed by the DWARF specification. So just searching the CU DIE children
was wrong.
To find all (defining) subprogram DIEs in a CU dwarf_getfuncs should
use __libdw_visit_scopes to walk the tree. The only tricky part is
making sure the offset returned and used when the callback returns
DWARF_CB_ABORT is correct and the search continues at the right spot
in the CU DIE tree. This operation now needs to rewalk the whole tree.
Two new testcases were added that fail without this patch. And the
allfcts test was tweaked so that it always returns DWARF_CB_ABORT
from its callback to make sure the offset handling is correct.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
---
libdw/ChangeLog | 7 ++++
libdw/dwarf_getfuncs.c | 75 ++++++++++++++++++++++++++--------------
libdw/libdw.h | 11 +++++-
tests/ChangeLog | 10 ++++++
tests/Makefile.am | 1 +
tests/allfcts.c | 12 +++++--
tests/run-allfcts.sh | 56 +++++++++++++++++++++++++++++-
tests/testfile_class_func.bz2 | Bin 0 -> 2962 bytes
tests/testfile_nested_funcs.bz2 | Bin 0 -> 3045 bytes
9 files changed, 141 insertions(+), 31 deletions(-)
create mode 100755 tests/testfile_class_func.bz2
create mode 100755 tests/testfile_nested_funcs.bz2
diff --git a/libdw/ChangeLog b/libdw/ChangeLog
index 1a85194..8e1dd92 100644
--- a/libdw/ChangeLog
+++ b/libdw/ChangeLog
@@ -1,3 +1,10 @@
+2013-09-20 Mark Wielaard <mjw@redhat.com>
+
+ * dwarf_getfuncs.c (visitor_info): New struct.
+ (tree_visitor): New function.
+ (dwarf_getfuncs): Use __libdw_visit_scopes with tree_visitor.
+ * libdw.h (dwarf_getfuncs): Expand function documentation.
+
2013-09-12 Mark Wielaard <mjw@redhat.com>
* fde.c (intern_fde): Free fde and set libdw errno when start
diff --git a/libdw/dwarf_getfuncs.c b/libdw/dwarf_getfuncs.c
index afc5b6e..80024c5 100644
--- a/libdw/dwarf_getfuncs.c
+++ b/libdw/dwarf_getfuncs.c
@@ -1,5 +1,5 @@
/* Get function information.
- Copyright (C) 2005 Red Hat, Inc.
+ Copyright (C) 2005, 2013 Red Hat, Inc.
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 2005.
@@ -35,6 +35,47 @@
#include "libdwP.h"
+struct visitor_info
+{
+ /* The user callback of dwarf_getfuncs. */
+ int (*callback) (Dwarf_Die *, void *);
+
+ /* The user arg value to dwarf_getfuncs. */
+ void *arg;
+
+ /* The DIE offset where to (re)start the search. Zero for all. */
+ Dwarf_Off start_offset;
+
+ /* Last subprogram DIE offset seen. */
+ Dwarf_Off last_offset;
+};
+
+static int
+tree_visitor (unsigned int depth __attribute__ ((unused)),
+ struct Dwarf_Die_Chain *chain, void *arg)
+{
+ struct visitor_info *const v = arg;
+ Dwarf_Die *die = &chain->die;
+ Dwarf_Off start_offset = v->start_offset;
+ Dwarf_Off die_offset = INTUSE(dwarf_dieoffset) (die);
+
+ /* Skip all DIEs till we found the (re)start offset. */
+ if (start_offset != 0)
+ {
+ if (die_offset == start_offset)
+ v->start_offset = 0;
+ return DWARF_CB_OK;
+ }
+
+ /* If this isn't a (defining) subprogram entity, skip DIE. */
+ if (INTUSE(dwarf_tag) (die) != DW_TAG_subprogram
+ || INTUSE(dwarf_hasattr) (die, DW_AT_declaration))
+ return DWARF_CB_OK;
+
+ v->last_offset = die_offset;
+ return (*v->callback) (die, v->arg);
+}
+
ptrdiff_t
dwarf_getfuncs (Dwarf_Die *cudie, int (*callback) (Dwarf_Die *, void *),
void *arg, ptrdiff_t offset)
@@ -43,31 +84,13 @@ dwarf_getfuncs (Dwarf_Die *cudie, int (*callback) (Dwarf_Die *, void *),
|| INTUSE(dwarf_tag) (cudie) != DW_TAG_compile_unit))
return -1;
- Dwarf_Die die_mem;
- Dwarf_Die *die;
+ struct visitor_info v = { callback, arg, offset, 0 };
+ struct Dwarf_Die_Chain chain = { .die = CUDIE (cudie->cu),
+ .parent = NULL };
+ int res = __libdw_visit_scopes (0, &chain, &tree_visitor, NULL, &v);
- int res;
- if (offset == 0)
- res = INTUSE(dwarf_child) (cudie, &die_mem);
+ if (res == DWARF_CB_ABORT)
+ return v.last_offset;
else
- {
- die = INTUSE(dwarf_offdie) (cudie->cu->dbg, offset, &die_mem);
- res = INTUSE(dwarf_siblingof) (die, &die_mem);
- }
- die = res != 0 ? NULL : &die_mem;
-
- while (die != NULL)
- {
- if (INTUSE(dwarf_tag) (die) == DW_TAG_subprogram)
- {
- if (callback (die, arg) != DWARF_CB_OK)
- return INTUSE(dwarf_dieoffset) (die);
- }
-
- if (INTUSE(dwarf_siblingof) (die, &die_mem) != 0)
- break;
- }
-
- /* That's all. */
- return 0;
+ return res;
}
diff --git a/libdw/libdw.h b/libdw/libdw.h
index d1cd177..0d94c52 100644
--- a/libdw/libdw.h
+++ b/libdw/libdw.h
@@ -747,7 +747,16 @@ extern Dwarf_Arange *dwarf_getarange_addr (Dwarf_Aranges *aranges,
-/* Get functions in CUDIE. */
+/* Get functions in CUDIE. The given callback will be called for all
+ defining DW_TAG_subprograms in the CU DIE tree. If the callback
+ returns DWARF_CB_ABORT the return value can be used as offset argument
+ to resume the function to find all remaining functions (this is not
+ really recommended, since it needs to rewalk the CU DIE tree first till
+ that offset is found again). If the callback returns DWARF_CB_OK
+ dwarf_getfuncs will not return but keep calling the callback for each
+ function DIE it finds. Pass zero for offset on the first call to walk
+ the full CU DIE tree. If no more functions can be found and the callback
+ returned DWARF_CB_OK then the function returns zero. */
extern ptrdiff_t dwarf_getfuncs (Dwarf_Die *cudie,
int (*callback) (Dwarf_Die *, void *),
void *arg, ptrdiff_t offset);
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 9ea285f..34cffd4 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,13 @@
+2013-09-20 Mark Wielaard <mjw@redhat.com>
+
+ * allfcts.c (cb): Return DWARF_CB_ABORT.
+ (main): Iterate over all offsets returned by dwarf_getfuncs.
+ * run-allfcts.sh: Add nested_funcs and class_func testcases.
+ * testfile_nested_funcs.bz2: New test file.
+ * testfile_class_func.bz2: Likewise.
+ * Makefile.am (EXTRA_DIST): Add testfile_class_func.bz2 and
+ testfile_nested_funcs.bz2.
+
2013-08-30 Mark Wielaard <mjw@redhat.com>
* Makefile.am (check_PROGRAMS): Add varlocs.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e06d914..58db6c3 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -119,6 +119,7 @@ EXTRA_DIST = run-arextract.sh run-arsymtest.sh \
testfile5.bz2 testfile6.bz2 testfile7.bz2 testfile8.bz2 \
testfile9.bz2 testfile10.bz2 testfile11.bz2 testfile12.bz2 \
testfile13.bz2 run-strip-test3.sh run-allfcts.sh \
+ testfile_class_func.bz2 testfile_nested_funcs.bz2 \
run-line2addr.sh run-elflint-test.sh testfile14.bz2 \
run-strip-test4.sh run-strip-test5.sh run-strip-test6.sh \
run-strip-test7.sh run-strip-test8.sh run-strip-groups.sh \
diff --git a/tests/allfcts.c b/tests/allfcts.c
index f14b493..7803722 100644
--- a/tests/allfcts.c
+++ b/tests/allfcts.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2005 Red Hat, Inc.
+/* Copyright (C) 2005, 2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
@@ -34,7 +34,7 @@ cb (Dwarf_Die *func, void *arg __attribute__ ((unused)))
printf ("%s:%d:%s\n", file, line, fct);
- return DWARF_CB_OK;
+ return DWARF_CB_ABORT;
}
@@ -57,7 +57,13 @@ main (int argc, char *argv[])
Dwarf_Die die_mem;
Dwarf_Die *die = dwarf_offdie (dbg, off + cuhl, &die_mem);
- (void) dwarf_getfuncs (die, cb, NULL, 0);
+ /* Explicitly stop in the callback and then resume each time. */
+ ptrdiff_t doff = 0;
+ do
+ {
+ doff = dwarf_getfuncs (die, cb, NULL, doff);
+ }
+ while (doff > 0);
off = noff;
}
diff --git a/tests/run-allfcts.sh b/tests/run-allfcts.sh
index 30f7dd4..6eaf13c 100755
--- a/tests/run-allfcts.sh
+++ b/tests/run-allfcts.sh
@@ -1,5 +1,5 @@
#! /bin/sh
-# Copyright (C) 2005 Red Hat, Inc.
+# Copyright (C) 2005, 2013 Red Hat, Inc.
# This file is part of elfutils.
# Written by Ulrich Drepper <drepper@redhat.com>, 2005.
#
@@ -37,4 +37,58 @@ testrun_compare ${abs_builddir}/allfcts testfile testfile2 testfile8 <<\EOF
/home/drepper/gnu/elfutils/build/src/../../src/strip.c:313:handle_elf
EOF
+# = nested_funcs.c =
+#
+# static int
+# foo (int x)
+# {
+# int bar (int y)
+# {
+# return x - y;
+# }
+#
+# return bar (x * 2);
+# }
+#
+# int
+# main (int argc, char ** argv)
+# {
+# return foo (argc);
+# }
+#
+# gcc -g -o nested_funcs nested_funcs.c
+
+# = class_func.cxx =
+#
+# namespace foobar
+# {
+# class Foo
+# {
+# public:
+# int bar(int x);
+# };
+#
+# int Foo::bar(int x) { return x - 42; }
+# };
+#
+# int
+# main (int argc, char **argv)
+# {
+# foobar::Foo foo;
+#
+# return foo.bar (42);
+# }
+#
+# clang++ -g -o class_func class_func.cxx
+
+testfiles testfile_nested_funcs testfile_class_func
+
+testrun_compare ${abs_builddir}/allfcts testfile_nested_funcs testfile_class_func <<\EOF
+/home/mark/src/tests/nested/nested_funcs.c:2:foo
+/home/mark/src/tests/nested/nested_funcs.c:4:bar
+/home/mark/src/tests/nested/nested_funcs.c:13:main
+/home/mark/src/tests/nested/class_func.cxx:6:bar
+/home/mark/src/tests/nested/class_func.cxx:13:main
+EOF
+
exit 0
diff --git a/tests/testfile_class_func.bz2 b/tests/testfile_class_func.bz2
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diff --git a/tests/testfile_nested_funcs.bz2 b/tests/testfile_nested_funcs.bz2
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--
1.8.3.1