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Added an option (-i) to have dump_syms output header information only.

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It is often helpful to check if a particular symbol file dumped by
dump_syms actually matches a version of a binary file we have. The
symbol output contains an ID which can be used to see if it matches
the binary file. Unfortunately, this ID is internally calculated
and not a standard hash of the binary file. Being able to output the
header information only will allow users to determine whether their
symbol file is up to date or not.

R=jochen@chromium.org
BUG=561447

Review URL: https://codereview.chromium.org/1864823002 .

Patch from David Yen <dyen@chromium.org>.
This commit is contained in:
David Yen
2016-04-08 04:37:45 +02:00
committed by Jochen Eisinger
parent 32901f6d4c
commit b0e5f26233
6 changed files with 188 additions and 83 deletions
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28
src/tools/linux/dump_syms/dump_syms.cc
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@@ -39,11 +39,13 @@
#include "common/linux/dump_symbols.h"
using google_breakpad::WriteSymbolFile;
using google_breakpad::WriteSymbolFileHeader;
int usage(const char* self) {
fprintf(stderr, "Usage: %s [OPTION] <binary-with-debugging-info> "
"[directories-for-debug-file]\n\n", self);
fprintf(stderr, "Options:\n");
fprintf(stderr, " -i: Output module header information only.\n");
fprintf(stderr, " -c Do not generate CFI section\n");
fprintf(stderr, " -r Do not handle inter-compilation unit references\n");
fprintf(stderr, " -v Print all warnings to stderr\n");
@@ -53,27 +55,29 @@ int usage(const char* self) {
int main(int argc, char **argv) {
if (argc < 2)
return usage(argv[0]);
bool header_only = false;
bool cfi = true;
bool handle_inter_cu_refs = true;
bool log_to_stderr = false;
int arg_index = 1;
while (arg_index < argc && strlen(argv[arg_index]) > 0 &&
argv[arg_index][0] == '-') {
if (strcmp("-c", argv[arg_index]) == 0) {
if (strcmp("-i", argv[arg_index]) == 0) {
header_only = true;
} else if (strcmp("-c", argv[arg_index]) == 0) {
cfi = false;
} else if (strcmp("-r", argv[arg_index]) == 0) {
handle_inter_cu_refs = false;
} else if (strcmp("-v", argv[arg_index]) == 0) {
log_to_stderr = true;
} else {
printf("2.4 %s\n", argv[arg_index]);
return usage(argv[0]);
}
++arg_index;
}
if (arg_index == argc)
return usage(argv[0]);
// Save stderr so it can be used below.
FILE* saved_stderr = fdopen(dup(fileno(stderr)), "w");
if (!log_to_stderr) {
@@ -82,7 +86,6 @@ int main(int argc, char **argv) {
// Add this brace section to silence gcc warnings.
}
}
const char* binary;
std::vector<string> debug_dirs;
binary = argv[arg_index];
@@ -92,11 +95,18 @@ int main(int argc, char **argv) {
debug_dirs.push_back(argv[debug_dir_index]);
}
SymbolData symbol_data = cfi ? ALL_SYMBOL_DATA : NO_CFI;
google_breakpad::DumpOptions options(symbol_data, handle_inter_cu_refs);
if (!WriteSymbolFile(binary, debug_dirs, options, std::cout)) {
fprintf(saved_stderr, "Failed to write symbol file.\n");
return 1;
if (header_only) {
if (!WriteSymbolFileHeader(binary, std::cout)) {
fprintf(saved_stderr, "Failed to process file.\n");
return 1;
}
} else {
SymbolData symbol_data = cfi ? ALL_SYMBOL_DATA : NO_CFI;
google_breakpad::DumpOptions options(symbol_data, handle_inter_cu_refs);
if (!WriteSymbolFile(binary, debug_dirs, options, std::cout)) {
fprintf(saved_stderr, "Failed to write symbol file.\n");
return 1;
}
}
return 0;