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tenfourfox/tools/profiler/gecko/local_debug_info_symbolizer.cc

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "PlatformMacros.h"
#include "nsAutoPtr.h"
#if !defined(SPS_OS_windows)
# include "common/module.h"
# include "processor/cfi_frame_info.h"
#endif
#include "google_breakpad/processor/code_module.h"
#include "google_breakpad/processor/code_modules.h"
#include "google_breakpad/processor/stack_frame.h"
#include "common/logging.h"
#if defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_arm_android) \
|| defined(SPS_PLAT_x86_linux) || defined(SPS_PLAT_x86_android)
# include "common/linux/dump_symbols.h"
#elif defined(SPS_PLAT_amd64_darwin) || defined(SPS_PLAT_x86_darwin)
# include "shim_mac_dump_syms.h"
#elif defined(SPS_OS_windows)
/* This is all stubbed out anyway, so don't do anything. */
#else
# error "Unknown platform"
#endif
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
# include "mozilla/Types.h"
# include "ElfLoader.h"
# include <dlfcn.h>
# include <sys/mman.h>
# include "nsString.h"
# include "nsDirectoryServiceUtils.h"
# include "nsDirectoryServiceDefs.h"
# include <sys/stat.h>
# include <fcntl.h>
#endif
#include "local_debug_info_symbolizer.h"
namespace google_breakpad {
LocalDebugInfoSymbolizer::~LocalDebugInfoSymbolizer() {
# if !defined(SPS_OS_windows)
for (SymbolMap::iterator it = symbols_.begin();
it != symbols_.end();
++it) {
delete it->second;
}
# endif
}
#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
// Find out where the installation's lib directory is, since we'll
// have to look in there to get hold of libmozglue.so. Returned
// C string is heap allocated and the caller must deallocate it.
static char* get_installation_lib_dir ( void )
{
nsCOMPtr<nsIProperties>
directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID));
if (!directoryService) return NULL;
nsCOMPtr<nsIFile> greDir;
nsresult rv = directoryService->Get(NS_GRE_DIR, NS_GET_IID(nsIFile),
getter_AddRefs(greDir));
if (NS_FAILED(rv)) return NULL;
nsCString path;
rv = greDir->GetNativePath(path);
if (NS_FAILED(rv)) return NULL;
return strdup(path.get());
}
// Read symbol data from a file on Android. OBJ_FILENAME has
// three possible cases:
//
// (1) /foo/bar/xyzzy/blah.apk!/libwurble.so
// We hand it as-is to faulty.lib and let it fish the relevant
// bits out of the APK.
//
// (2) libmozglue.so
// This is part of the Fennec installation, but is not in the
// APK. Instead we have to figure out the installation path
// and look for it there. Because of faulty.lib limitations,
// we have to use regular open/mmap instead of faulty.lib.
//
// (3) libanythingelse.so
// faulty.lib assumes this is a system library, and prepends
// "/system/lib/" to the path. So as in (1), we can give it
// as-is to faulty.lib.
//
// Hence only (2) requires special-casing here.
//
static bool ReadSymbolData_ANDROID(const string& obj_filename,
const std::vector<string>& debug_dirs,
SymbolData symbol_data,
Module** module)
{
string obj_file_to_use = obj_filename;
// Do (2) in the comment above.
if (obj_file_to_use == "libmozglue.so") {
char* libdir = get_installation_lib_dir();
if (libdir) {
obj_file_to_use = string(libdir) + "/lib/" + obj_file_to_use;
free(libdir);
}
// Use regular open/mmap here because of faulty.lib limitations
int fd = open(obj_file_to_use.c_str(), O_RDONLY);
if (fd == -1) {
BPLOG(INFO) << "ReadSymbolData_APK: Failed to open \'"
<< obj_file_to_use << "\'";
return false;
}
struct stat st;
if (fstat(fd, &st) != 0) {
close(fd);
BPLOG(INFO) << "ReadSymbolData_APK: Failed to fstat \'"
<< obj_file_to_use << "\'";
return false;
}
void* image = mmap(nullptr, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (image == MAP_FAILED) {
close(fd);
BPLOG(INFO) << "ReadSymbolData_APK: Failed to mmap \'"
<< obj_file_to_use << "\'";
return false;
}
bool ok = ReadSymbolDataInternal((const uint8_t*)image,
obj_file_to_use, debug_dirs,
symbol_data, module);
munmap(image, st.st_size);
close(fd);
return ok;
}
// Regardless of whether the file is inside an APK or not, we ask
// faulty.lib to map it, then call ReadSymbolDataInternal, then
// unmap and dlclose it.
void* hdl = dlopen(obj_file_to_use.c_str(), RTLD_GLOBAL | RTLD_LAZY);
if (!hdl) {
BPLOG(INFO) << "ReadSymbolData_APK: Failed to get handle for ELF file \'"
<< obj_file_to_use << "\'";
return false;
}
size_t sz = __dl_get_mappable_length(hdl);
if (sz == 0) {
dlclose(hdl);
BPLOG(INFO) << "ReadSymbolData_APK: Unable to get size for ELF file \'"
<< obj_file_to_use << "\'";
return false;
}
void* image = __dl_mmap(hdl, NULL, sz, 0);
if (image == MAP_FAILED) {
dlclose(hdl);
BPLOG(INFO) << "ReadSymbolData_APK: Failed to mmap ELF file \'"
<< obj_file_to_use << "\'";
return false;
}
bool ok = ReadSymbolDataInternal((const uint8_t*)image,
obj_file_to_use, debug_dirs,
symbol_data, module);
__dl_munmap(hdl, image, sz);
dlclose(hdl);
return ok;
}
#endif /* defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK) */
StackFrameSymbolizer::SymbolizerResult
LocalDebugInfoSymbolizer::FillSourceLineInfo(const CodeModules* modules,
const SystemInfo* system_info,
StackFrame* frame) {
if (!modules) {
return kError;
}
const CodeModule* module = modules->GetModuleForAddress(frame->instruction);
if (!module) {
return kError;
}
frame->module = module;
# if !defined(SPS_OS_windows)
Module* debug_info_module = NULL;
SymbolMap::const_iterator it = symbols_.find(module->code_file());
if (it == symbols_.end()) {
if (no_symbol_modules_.find(module->code_file()) !=
no_symbol_modules_.end()) {
return kNoError;
}
bool ok = false;
# if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
ok = ReadSymbolData_ANDROID(module->code_file(), debug_dirs_,
ONLY_CFI, &debug_info_module);
# elif defined(SPS_PLAT_amd64_darwin) || defined(SPS_PLAT_x86_darwin)
ok = ReadSymbolData_DARWIN(module->code_file(), debug_dirs_,
ONLY_CFI, &debug_info_module);
# else
ok = ReadSymbolData(module->code_file(), debug_dirs_,
ONLY_CFI, &debug_info_module);
# endif
if (!ok) {
if (debug_info_module)
delete debug_info_module;
no_symbol_modules_.insert(module->code_file());
return kNoError;
}
symbols_[module->code_file()] = debug_info_module;
} else {
debug_info_module = it->second;
}
uint64_t address = frame->instruction - frame->module->base_address();
Module::Function* function =
debug_info_module->FindFunctionByAddress(address);
if (function) {
frame->function_name = function->name;
//TODO: line info: function->lines
} else {
Module::Extern* ex = debug_info_module->FindExternByAddress(address);
if (ex) {
frame->function_name = ex->name;
}
}
# endif /* !defined(SPS_OS_windows) */
return kNoError;
}
WindowsFrameInfo* LocalDebugInfoSymbolizer::FindWindowsFrameInfo(
const StackFrame* frame) {
// Not currently implemented, would require PDBSourceLineWriter to
// implement an API to return symbol data.
return NULL;
}
#if !defined(SPS_OS_windows)
// Taken wholesale from source_line_resolver_base.cc
bool ParseCFIRuleSet(const string& rule_set, CFIFrameInfo* frame_info) {
CFIFrameInfoParseHandler handler(frame_info);
CFIRuleParser parser(&handler);
return parser.Parse(rule_set);
}
static void ConvertCFI(const UniqueString* name, const Module::Expr& rule,
CFIFrameInfo* frame_info) {
if (name == ustr__ZDcfa()) frame_info->SetCFARule(rule);
else if (name == ustr__ZDra()) frame_info->SetRARule(rule);
else frame_info->SetRegisterRule(name, rule);
}
static void ConvertCFI(const Module::RuleMap& rule_map,
CFIFrameInfo* frame_info) {
for (Module::RuleMap::const_iterator it = rule_map.begin();
it != rule_map.end(); ++it) {
ConvertCFI(it->first, it->second, frame_info);
}
}
#endif
CFIFrameInfo* LocalDebugInfoSymbolizer::FindCFIFrameInfo(
const StackFrame* frame) {
#if defined(SPS_OS_windows)
return NULL;
#else
if (!frame || !frame->module) return NULL;
SymbolMap::const_iterator it = symbols_.find(frame->module->code_file());
if (it == symbols_.end()) return NULL;
Module* module = it->second;
uint64_t address = frame->instruction - frame->module->base_address();
Module::StackFrameEntry* entry =
module->FindStackFrameEntryByAddress(address);
if (!entry)
return NULL;
//TODO: can we cache this data per-address? does that make sense?
// TODO: Maybe this should use google_breakpad::scoped_ptr, since we're in
// "namespace google_breakpad". Not using scoped_ptr currently, because its
// header triggers build warnings -- see bug 855010.
nsAutoPtr<CFIFrameInfo> rules(new CFIFrameInfo());
ConvertCFI(entry->initial_rules, rules);
for (Module::RuleChangeMap::const_iterator delta_it =
entry->rule_changes.begin();
delta_it != entry->rule_changes.end() && delta_it->first < address;
++delta_it) {
ConvertCFI(delta_it->second, rules);
}
return rules.forget();
#endif /* defined(SPS_OS_windows) */
}
} // namespace google_breakpad
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