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Rework dump_symbols.cc using templates and traits classes to handle cross-word-size symbol dumping

Browse source 
R=mark at https://breakpad.appspot.com/393002/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@987 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek 2012-07-18 17:55:08 +00:00
parent 972be40f1f
commit 4116671cbf
5 changed files with 370 additions and 252 deletions
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57
src/common/linux/elfutils.cc
View file

@ -33,6 +33,7 @@
#include <string.h>
#include "common/linux/linux_libc_support.h"
#include "common/linux/elfutils-inl.h"
namespace google_breakpad {
@ -41,7 +42,7 @@ namespace {
template<typename ElfClass>
void FindElfClassSection(const char *elf_base,
const char *section_name,
uint32_t section_type,
typename ElfClass::Word section_type,
const void **section_start,
int *section_size) {
typedef typename ElfClass::Ehdr Ehdr;
@ -53,27 +54,21 @@ void FindElfClassSection(const char *elf_base,
assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);
int name_len = my_strlen(section_name);
const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);
assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);
const Shdr* sections =
reinterpret_cast<const Shdr*>(elf_base + elf_header->e_shoff);
const Shdr* string_section = sections + elf_header->e_shstrndx;
GetOffset<ElfClass,Shdr>(elf_header, elf_header->e_shoff);
const Shdr* section_names = sections + elf_header->e_shstrndx;
const char* names =
GetOffset<ElfClass,char>(elf_header, section_names->sh_offset);
const char *names_end = names + section_names->sh_size;
const Shdr* section =
FindElfSectionByName<ElfClass>(section_name, section_type,
sections, names, names_end,
elf_header->e_shnum);
const Shdr* section = NULL;
for (int i = 0; i < elf_header->e_shnum; ++i) {
if (sections[i].sh_type == section_type) {
const char* current_section_name = (char*)(elf_base +
string_section->sh_offset +
sections[i].sh_name);
if (!my_strncmp(current_section_name, section_name, name_len)) {
section = &sections[i];
break;
}
}
}
if (section != NULL && section->sh_size > 0) {
*section_start = elf_base + section->sh_offset;
*section_size = section->sh_size;
@ -82,6 +77,18 @@ void FindElfClassSection(const char *elf_base,
} // namespace
bool IsValidElf(const void* elf_base) {
return my_strncmp(reinterpret_cast<const char*>(elf_base),
ELFMAG, SELFMAG) == 0;
}
int ElfClass(const void* elf_base) {
const ElfW(Ehdr)* elf_header =
reinterpret_cast<const ElfW(Ehdr)*>(elf_base);
return elf_header->e_ident[EI_CLASS];
}
bool FindElfSection(const void *elf_mapped_base,
const char *section_name,
uint32_t section_type,
@ -95,22 +102,22 @@ bool FindElfSection(const void *elf_mapped_base,
*section_start = NULL;
*section_size = 0;
const char* elf_base =
static_cast<const char*>(elf_mapped_base);
const ElfW(Ehdr)* elf_header =
reinterpret_cast<const ElfW(Ehdr)*>(elf_base);
if (my_strncmp(elf_base, ELFMAG, SELFMAG) != 0)
if (!IsValidElf(elf_mapped_base))
return false;
int cls = ElfClass(elf_mapped_base);
if (elfclass) {
*elfclass = elf_header->e_ident[EI_CLASS];
*elfclass = cls;
}
if (elf_header->e_ident[EI_CLASS] == ELFCLASS32) {
const char* elf_base =
static_cast<const char*>(elf_mapped_base);
if (cls == ELFCLASS32) {
FindElfClassSection<ElfClass32>(elf_base, section_name, section_type,
section_start, section_size);
return *section_start != NULL;
} else if (elf_header->e_ident[EI_CLASS] == ELFCLASS64) {
} else if (cls == ELFCLASS64) {
FindElfClassSection<ElfClass64>(elf_base, section_name, section_type,
section_start, section_size);
return *section_start != NULL;