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Use a std::map instead of a linear search to look up files for line records.

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With this patch, the time required to generate Breakpad symbols for
Firefox's libxul.so on a MacBook Pro 3,1 drops from 32s to 2s.

I verified that this patch had no effect on the output of dump_syms
when applied to firefox-bin and its libraries when built with -gstabs+.

A=jimblandy
R=nealsid


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@362 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
jimblandy@gmail.com 2009-07-27 21:30:02 +00:00
parent 515f92cd61
commit 722afebee0
1 changed files with 20 additions and 15 deletions
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35
src/common/linux/dump_symbols.cc
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@ -46,6 +46,7 @@
#include <functional>
#include <list>
#include <vector>
#include <map>
#include <string.h>
#include "common/linux/dump_symbols.h"
@ -371,21 +372,24 @@ static ElfW(Addr) NextAddress(
return 0;
}
static int FindFileByNameIdx(uint32_t name_index,
SourceFileInfoList &files) {
for (SourceFileInfoList::iterator it = files.begin();
it != files.end(); it++) {
if (it->name_index == name_index)
return it->source_id;
}
return -1;
}
// Add included file information.
// Also fix the source id for the line info.
static void AddIncludedFiles(struct SymbolInfo *symbols,
const ElfW(Shdr) *stabstr_section) {
// A map taking an offset into the string table to the SourceFileInfo
// structure whose name is at that offset. LineInfo entries contain these
// offsets; we use this map to pair them up with their source files.
typedef std::map<unsigned int, struct SourceFileInfo *> FileByOffsetMap;
FileByOffsetMap index_to_file;
// Populate index_to_file with the source files we have now.
for (SourceFileInfoList::iterator source_file_it =
symbols->source_file_info.begin();
source_file_it != symbols->source_file_info.end();
++source_file_it) {
index_to_file[source_file_it->name_index] = &*source_file_it;
}
for (SourceFileInfoList::iterator source_file_it =
symbols->source_file_info.begin();
source_file_it != symbols->source_file_info.end();
@ -409,9 +413,9 @@ static void AddIncludedFiles(struct SymbolInfo *symbols,
if (line_info.source_name_index != source_file.name_index) {
// This line is not from the current source file, check if this
// source file has been added before.
int found_source_id = FindFileByNameIdx(line_info.source_name_index,
symbols->source_file_info);
if (found_source_id < 0) {
struct SourceFileInfo **file_map_entry
= &index_to_file[line_info.source_name_index];
if (! *file_map_entry) {
// Got a new included file.
// Those included files don't have address or line information.
SourceFileInfo new_file;
@ -422,9 +426,10 @@ static void AddIncludedFiles(struct SymbolInfo *symbols,
new_file.source_id = symbols->next_source_id++;
line_info.source_id = new_file.source_id;
symbols->source_file_info.push_back(new_file);
*file_map_entry = &symbols->source_file_info.back();
} else {
// The file has been added.
line_info.source_id = found_source_id;
line_info.source_id = (*file_map_entry)->source_id;
}
} else {
// The line belongs to the file.