From: Tom de Vries Date: Fri, 9 Nov 2018 10:54:04 +0000 (+0100) Subject: [gdb/symtab] Fix language of duplicate static minimal symbol X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=9325300dc283ece6bf6305b912f53114c0895114;hp=13daa8e4889a971309f7d46a8d49129cb26088a5;p=deliverable%2Fbinutils-gdb.git [gdb/symtab] Fix language of duplicate static minimal symbol Consider a test-case with source files msym.c: ... static int foo (void) { return 1; } ... and msym_main.c: ... static int foo (void) { return 2; } int main (void) { return 0; } .. compiled as c++ with minimal symbols: ... $ g++ msym_main.c msym.c ... With objdump -x we find the two foo symbols prefixed with their corresponding files in the symbol table: ... 0000000000000000 l df *ABS* 0000000000000000 msym_main.c 00000000004004c7 l F .text 000000000000000b _ZL3foov 0000000000000000 l df *ABS* 0000000000000000 msym.c 00000000004004dd l F .text 000000000000000b _ZL3foov ... However, when we use gdb to print info on foo, both foos are listed, but we get one symbol mangled and one symbol demangled: ... $ gdb ./a.out -batch -ex "info func foo" All functions matching regular expression "foo": Non-debugging symbols: 0x00000000004004c7 foo() 0x00000000004004dd _ZL3foov ... During minimal symbol reading symbol_set_names is called for each symbol. First, it's called with foo from msym.c, an entry is created in per_bfd->demangled_names_hash and symbol_find_demangled_name is called, which has the side effect of setting the language of the symbol to language_cplus. Then, it's called with foo from msym_main.c. Since per_bfd->demangled_names_hash already has an entry for that name, symbol_find_demangled_name is not called, and the language of the symbol remains language_auto. Fix this by doing the symbol_find_demangled_name call unconditionally. Build and reg-tested on x86_64-linux. gdb/ChangeLog: 2018-11-09 Tom de Vries * symtab.c (symbol_set_names): Call symbol_find_demangled_name unconditionally, to set the language of the symbol. Manage freeing returned pointer using gdb::unique_xmalloc_ptr. gdb/testsuite/ChangeLog: 2018-11-09 Tom de Vries * gdb.base/msym-lang.c: New test. * gdb.base/msym-lang.exp: New file. * gdb.base/msym-lang-main.c: New test. --- diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 4ba96baeb4..17bb500ad4 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,9 @@ +2018-11-09 Tom de Vries + + * symtab.c (symbol_set_names): Call symbol_find_demangled_name + unconditionally, to set the language of the symbol. Manage freeing + returned pointer using gdb::unique_xmalloc_ptr. + 2018-11-08 Tom Tromey * record.c (require_record_target): Upper-case "". diff --git a/gdb/symtab.c b/gdb/symtab.c index 7649908d9c..2e9e6325ad 100644 --- a/gdb/symtab.c +++ b/gdb/symtab.c @@ -818,6 +818,11 @@ symbol_set_names (struct general_symbol_info *gsymbol, else linkage_name_copy = linkage_name; + /* Set the symbol language. */ + char *demangled_name_ptr + = symbol_find_demangled_name (gsymbol, linkage_name_copy); + gdb::unique_xmalloc_ptr demangled_name (demangled_name_ptr); + entry.mangled = linkage_name_copy; slot = ((struct demangled_name_entry **) htab_find_slot (per_bfd->demangled_names_hash, @@ -830,9 +835,7 @@ symbol_set_names (struct general_symbol_info *gsymbol, || (gsymbol->language == language_go && (*slot)->demangled[0] == '\0')) { - char *demangled_name = symbol_find_demangled_name (gsymbol, - linkage_name_copy); - int demangled_len = demangled_name ? strlen (demangled_name) : 0; + int demangled_len = demangled_name ? strlen (demangled_name.get ()) : 0; /* Suppose we have demangled_name==NULL, copy_name==0, and linkage_name_copy==linkage_name. In this case, we already have the @@ -870,10 +873,7 @@ symbol_set_names (struct general_symbol_info *gsymbol, } if (demangled_name != NULL) - { - strcpy ((*slot)->demangled, demangled_name); - xfree (demangled_name); - } + strcpy ((*slot)->demangled, demangled_name.get()); else (*slot)->demangled[0] = '\0'; } diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index a0e614fbde..015028c1db 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2018-11-09 Tom de Vries + + * gdb.base/msym-lang.c: New test. + * gdb.base/msym-lang.exp: New file. + * gdb.base/msym-lang-main.c: New test. + 2018-11-08 Tom Tromey PR gdb/23555: diff --git a/gdb/testsuite/gdb.base/msym-lang-main.c b/gdb/testsuite/gdb.base/msym-lang-main.c new file mode 100644 index 0000000000..f093f71ca4 --- /dev/null +++ b/gdb/testsuite/gdb.base/msym-lang-main.c @@ -0,0 +1,28 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2018 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +static int +foo (void) +{ + return 2; +} + +int +main (void) +{ + return 0; +} diff --git a/gdb/testsuite/gdb.base/msym-lang.c b/gdb/testsuite/gdb.base/msym-lang.c new file mode 100644 index 0000000000..c9610154dd --- /dev/null +++ b/gdb/testsuite/gdb.base/msym-lang.c @@ -0,0 +1,22 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2018 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +static int +foo (void) +{ + return 1; +} diff --git a/gdb/testsuite/gdb.base/msym-lang.exp b/gdb/testsuite/gdb.base/msym-lang.exp new file mode 100644 index 0000000000..993225c9d6 --- /dev/null +++ b/gdb/testsuite/gdb.base/msym-lang.exp @@ -0,0 +1,25 @@ +# Copyright (C) 2018 Free Software Foundation, Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + +standard_testfile msym-lang-main.c msym-lang.c + +if {[prepare_for_testing "failed to prepare" $testfile [list $srcfile $srcfile2] \ + {c++}]} { + return -1 +} + +clean_restart ${testfile} + +gdb_test "info func foo" ".* foo\\(\\).* foo\\(\\).*"