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Dump PUBLIC + CFI records from libraries without debug info on Linux, use .dynsym for symbol names if there are no usable debug symbols.

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R=jimb at http://breakpad.appspot.com/275001/show

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@793 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek
2011-07-06 17:05:49 +00:00
parent be55cc8cf0
commit b2f96f314c
6 changed files with 773 additions and 7 deletions
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56
src/common/linux/dump_symbols.cc
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@@ -56,6 +56,7 @@
#include "common/dwarf_cfi_to_module.h"
#include "common/dwarf_cu_to_module.h"
#include "common/dwarf_line_to_module.h"
#include "common/linux/elf_symbols_to_module.h"
#include "common/linux/file_id.h"
#include "common/module.h"
#include "common/stabs_reader.h"
@@ -531,6 +532,7 @@ static bool LoadSymbols(const std::string &obj_file,
reinterpret_cast<ElfW(Shdr) *>(elf_header->e_shoff);
const ElfW(Shdr) *section_names = sections + elf_header->e_shstrndx;
bool found_debug_info_section = false;
bool found_usable_info = false;
// Look for STABS debugging information, and load it if present.
const ElfW(Shdr) *stab_section
@@ -540,6 +542,7 @@ static bool LoadSymbols(const std::string &obj_file,
const ElfW(Shdr) *stabstr_section = stab_section->sh_link + sections;
if (stabstr_section) {
found_debug_info_section = true;
found_usable_info = true;
info->LoadedSection(".stab");
if (!LoadStabs(elf_header, stab_section, stabstr_section, big_endian,
module)) {
@@ -555,6 +558,7 @@ static bool LoadSymbols(const std::string &obj_file,
elf_header->e_shnum);
if (dwarf_section) {
found_debug_info_section = true;
found_usable_info = true;
info->LoadedSection(".debug_info");
if (!LoadDwarf(obj_file, elf_header, big_endian, module))
fprintf(stderr, "%s: \".debug_info\" section found, but failed to load "
@@ -571,8 +575,10 @@ static bool LoadSymbols(const std::string &obj_file,
// information, the other debugging information could be perfectly
// useful.
info->LoadedSection(".debug_frame");
LoadDwarfCFI(obj_file, elf_header, ".debug_frame",
dwarf_cfi_section, false, 0, 0, big_endian, module);
bool result =
LoadDwarfCFI(obj_file, elf_header, ".debug_frame",
dwarf_cfi_section, false, 0, 0, big_endian, module);
found_usable_info = found_usable_info || result;
}
// Linux C++ exception handling information can also provide
@@ -590,8 +596,10 @@ static bool LoadSymbols(const std::string &obj_file,
elf_header->e_shnum);
info->LoadedSection(".eh_frame");
// As above, ignore the return value of this function.
LoadDwarfCFI(obj_file, elf_header, ".eh_frame", eh_frame_section, true,
got_section, text_section, big_endian, module);
bool result =
LoadDwarfCFI(obj_file, elf_header, ".eh_frame", eh_frame_section, true,
got_section, text_section, big_endian, module);
found_usable_info = found_usable_info || result;
}
if (!found_debug_info_section) {
@@ -617,7 +625,44 @@ static bool LoadSymbols(const std::string &obj_file,
fprintf(stderr, "%s does not contain a .gnu_debuglink section.\n",
obj_file.c_str());
}
} else {
// The caller doesn't want to consult .gnu_debuglink.
// See if there are export symbols available.
const ElfW(Shdr) *dynsym_section =
FindSectionByName(".dynsym", sections, section_names,
elf_header->e_shnum);
const ElfW(Shdr) *dynstr_section =
FindSectionByName(".dynstr", sections, section_names,
elf_header->e_shnum);
if (dynsym_section && dynstr_section) {
info->LoadedSection(".dynsym");
fprintf(stderr, "Have .dynsym + .dynstr\n");
uint8_t* dynsyms =
reinterpret_cast<uint8_t*>(dynsym_section->sh_offset);
uint8_t* dynstrs =
reinterpret_cast<uint8_t*>(dynstr_section->sh_offset);
bool result =
ELFSymbolsToModule(dynsyms,
dynsym_section->sh_size,
dynstrs,
dynstr_section->sh_size,
big_endian,
// This could change to something more useful
// when support for dumping cross-architecture
// symbols is finished.
sizeof(ElfW(Addr)),
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;
}
@@ -709,7 +754,8 @@ bool WriteSymbolFile(const std::string &obj_file,
LoadSymbolsInfo info(debug_dir);
Module module(name, os, architecture, id);
if (!LoadSymbols(obj_file, big_endian, elf_header, true, &info, &module)) {
if (!LoadSymbols(obj_file, big_endian, elf_header, !debug_dir.empty(),
&info, &module)) {
const std::string debuglink_file = info.debuglink_file();
if (debuglink_file.empty())
return false;