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Read dynamic symbols table even if binary contains debug info

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A=Wander Lairson Costa <wcosta@mozilla.com>. R=ted at https://breakpad.appspot.com/9684002/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1400 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek@gmail.com 2014-11-03 18:25:43 +00:00
parent c971cf439c
commit 8127f56dff
2 changed files with 53 additions and 45 deletions
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79
src/common/linux/dump_symbols.cc
View file

@ -689,6 +689,8 @@ bool LoadSymbols(const string& obj_file,
names_end, elf_header->e_shnum);
if (gnu_debuglink_section) {
if (!info->debug_dirs().empty()) {
found_debug_info_section = true;
const char* debuglink_contents =
GetOffset<ElfClass, char>(elf_header,
gnu_debuglink_section->sh_offset);
@ -707,50 +709,45 @@ bool LoadSymbols(const string& obj_file,
fprintf(stderr, "%s does not contain a .gnu_debuglink section.\n",
obj_file.c_str());
}
} else {
if (options.symbol_data != ONLY_CFI) {
// The caller doesn't want to consult .gnu_debuglink.
// See if there are export symbols available.
const Shdr* dynsym_section =
FindElfSectionByName<ElfClass>(".dynsym", SHT_DYNSYM,
sections, names, names_end,
elf_header->e_shnum);
const Shdr* dynstr_section =
FindElfSectionByName<ElfClass>(".dynstr", SHT_STRTAB,
sections, names, names_end,
elf_header->e_shnum);
if (dynsym_section && dynstr_section) {
info->LoadedSection(".dynsym");
const uint8_t* dynsyms =
GetOffset<ElfClass, uint8_t>(elf_header,
dynsym_section->sh_offset);
const uint8_t* dynstrs =
GetOffset<ElfClass, uint8_t>(elf_header,
dynstr_section->sh_offset);
bool result =
ELFSymbolsToModule(dynsyms,
dynsym_section->sh_size,
dynstrs,
dynstr_section->sh_size,
big_endian,
ElfClass::kAddrSize,
module);
found_usable_info = found_usable_info || result;
}
}
// Return true if some usable information was found, since
// the caller doesn't want to use .gnu_debuglink.
return found_usable_info;
}
// No debug info was found, let the user try again with .gnu_debuglink
// if present.
return false;
}
return true;
if (options.symbol_data != ONLY_CFI) {
const Shdr* dynsym_section =
FindElfSectionByName<ElfClass>(".dynsym", SHT_DYNSYM,
sections, names, names_end,
elf_header->e_shnum);
const Shdr* dynstr_section =
FindElfSectionByName<ElfClass>(".dynstr", SHT_STRTAB,
sections, names, names_end,
elf_header->e_shnum);
if (dynsym_section && dynstr_section) {
info->LoadedSection(".dynsym");
const uint8_t* dynsyms =
GetOffset<ElfClass, uint8_t>(elf_header,
dynsym_section->sh_offset);
const uint8_t* dynstrs =
GetOffset<ElfClass, uint8_t>(elf_header,
dynstr_section->sh_offset);
bool result =
ELFSymbolsToModule(dynsyms,
dynsym_section->sh_size,
dynstrs,
dynstr_section->sh_size,
big_endian,
ElfClass::kAddrSize,
module);
found_usable_info = found_usable_info || result;
}
}
if (read_gnu_debug_link) {
return found_debug_info_section;
}
// Return true if some usable information was found
return found_usable_info;
}
// Return the breakpad symbol file identifier for the architecture of

19
src/common/module.cc
View file

@ -98,10 +98,21 @@ void Module::AddStackFrameEntry(StackFrameEntry *stack_frame_entry) {
}
void Module::AddExtern(Extern *ext) {
std::pair<ExternSet::iterator,bool> ret = externs_.insert(ext);
if (!ret.second) {
// Free the duplicate that was not inserted because this Module
// now owns it.
Function func;
func.name = ext->name;
func.address = ext->address;
// Since parsing debug section and public info are not necessarily
// mutually exclusive, check if the symbol has already been read
// as a function to avoid duplicates.
if (functions_.find(&func) == functions_.end()) {
std::pair<ExternSet::iterator,bool> ret = externs_.insert(ext);
if (!ret.second) {
// Free the duplicate that was not inserted because this Module
// now owns it.
delete ext;
}
} else {
delete ext;
}
}