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Merge "Add corkscrew support for finding static symbols."

This commit is contained in:
Christopher Ferris 2013-11-04 23:19:53 +00:00 committed by Gerrit Code Review
parent 8c58086c54 923b536920
commit 408b3acf5e
1 changed files with 25 additions and 7 deletions
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32
libbacktrace/Corkscrew.cpp
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@ -86,15 +86,33 @@ bool CorkscrewCurrent::Unwind(size_t num_ignore_frames) {
std::string CorkscrewCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
*offset = 0;
// Get information about the current thread.
Dl_info info;
const backtrace_map_info_t* map_info = backtrace_obj_->FindMapInfo(pc);
const char* symbol_name = NULL;
if (map_info && dladdr((const void*)pc, &info) && info.dli_sname) {
*offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase;
symbol_name = info.dli_sname;
return symbol_name;
if (map_info) {
if (dladdr((const void*)pc, &info)) {
if (info.dli_sname) {
*offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase;
return info.dli_sname;
}
} else {
// dladdr(3) didn't find a symbol; maybe it's static? Look in the ELF file...
symbol_table_t* symbol_table = load_symbol_table(map_info->name);
if (symbol_table) {
// First check if we can find the symbol using a relative pc.
std::string name;
const symbol_t* elf_symbol = find_symbol(symbol_table, pc - map_info->start);
if (elf_symbol) {
name = elf_symbol->name;
*offset = pc - map_info->start - elf_symbol->start;
} else if ((elf_symbol = find_symbol(symbol_table, pc)) != NULL) {
// Found the symbol using the absolute pc.
name = elf_symbol->name;
*offset = pc - elf_symbol->start;
}
free_symbol_table(symbol_table);
return name;
}
}
}
return "";
}