cb5dc1faa8
This patch introduces support for storing debug info for merged functions in the GSYM debug info. It allows GSYM to represent multiple functions that share the same address range, which occur when multiple functions are merged during linker ICF. The core of this functionality is the new `MergedFunctionsInfo` class, which is integrated into the existing `FunctionInfo` structure. During GSYM creation, functions with identical address ranges are now grouped together, with one function serving as the "master" and the others becoming "merged" functions. This organization is preserved in the GSYM format and can be read back and displayed when dumping GSYM information. Old readers will only see the master function, and ther "merged" functions will not be processed. Note: This patch just adds the functionality to the gSYM format - additional changes to the gsym format and algorithmic changes to logic existing tooling are needed to take advantage of this data. Exact output of `llvm-gsymutil --verify --verbose` for the included test: [gist](https://gist.github.com/alx32/b9c104d7f87c0b3e7b4171399fc2dca3)
627 lines
21 KiB
C++
627 lines
21 KiB
C++
//===-- gsymutil.cpp - GSYM dumping and creation utility for llvm ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/DebugInfo/DIContext.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/Option.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/JSON.h"
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#include "llvm/Support/LLVMDriver.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Regex.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/TargetParser/Triple.h"
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#include <algorithm>
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#include <cstring>
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#include <inttypes.h>
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#include <iostream>
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#include <optional>
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#include <string>
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#include <system_error>
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#include <vector>
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#include "llvm/DebugInfo/GSYM/DwarfTransformer.h"
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#include "llvm/DebugInfo/GSYM/FunctionInfo.h"
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#include "llvm/DebugInfo/GSYM/GsymCreator.h"
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#include "llvm/DebugInfo/GSYM/GsymReader.h"
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#include "llvm/DebugInfo/GSYM/InlineInfo.h"
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#include "llvm/DebugInfo/GSYM/LookupResult.h"
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#include "llvm/DebugInfo/GSYM/ObjectFileTransformer.h"
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#include "llvm/DebugInfo/GSYM/OutputAggregator.h"
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#include <optional>
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using namespace llvm;
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using namespace gsym;
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using namespace object;
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/// @}
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/// Command line options.
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/// @{
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using namespace llvm::opt;
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enum ID {
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OPT_INVALID = 0, // This is not an option ID.
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#define OPTION(...) LLVM_MAKE_OPT_ID(__VA_ARGS__),
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#include "Opts.inc"
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#undef OPTION
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};
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#define PREFIX(NAME, VALUE) \
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constexpr llvm::StringLiteral NAME##_init[] = VALUE; \
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constexpr llvm::ArrayRef<llvm::StringLiteral> NAME( \
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NAME##_init, std::size(NAME##_init) - 1);
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#include "Opts.inc"
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#undef PREFIX
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const opt::OptTable::Info InfoTable[] = {
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#define OPTION(...) LLVM_CONSTRUCT_OPT_INFO(__VA_ARGS__),
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#include "Opts.inc"
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#undef OPTION
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};
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class GSYMUtilOptTable : public llvm::opt::GenericOptTable {
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public:
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GSYMUtilOptTable() : GenericOptTable(InfoTable) {
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setGroupedShortOptions(true);
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}
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};
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static bool Verbose;
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static std::vector<std::string> InputFilenames;
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static std::string ConvertFilename;
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static std::vector<std::string> ArchFilters;
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static std::string OutputFilename;
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static std::string JsonSummaryFile;
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static bool Verify;
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static unsigned NumThreads;
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static uint64_t SegmentSize;
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static bool Quiet;
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static std::vector<uint64_t> LookupAddresses;
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static bool LookupAddressesFromStdin;
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static bool StoreMergedFunctionInfo = false;
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static void parseArgs(int argc, char **argv) {
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GSYMUtilOptTable Tbl;
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llvm::StringRef ToolName = argv[0];
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llvm::BumpPtrAllocator A;
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llvm::StringSaver Saver{A};
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llvm::opt::InputArgList Args =
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Tbl.parseArgs(argc, argv, OPT_UNKNOWN, Saver, [&](StringRef Msg) {
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llvm::errs() << Msg << '\n';
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std::exit(1);
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});
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if (Args.hasArg(OPT_help)) {
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const char *Overview =
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"A tool for dumping, searching and creating GSYM files.\n\n"
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"Specify one or more GSYM paths as arguments to dump all of the "
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"information in each GSYM file.\n"
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"Specify a single GSYM file along with one or more --lookup options to "
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"lookup addresses within that GSYM file.\n"
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"Use the --convert option to specify a file with option --out-file "
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"option to convert to GSYM format.\n";
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Tbl.printHelp(llvm::outs(), "llvm-gsymutil [options] <input GSYM files>",
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Overview);
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std::exit(0);
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}
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if (Args.hasArg(OPT_version)) {
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llvm::outs() << ToolName << '\n';
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cl::PrintVersionMessage();
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std::exit(0);
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}
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Verbose = Args.hasArg(OPT_verbose);
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for (const llvm::opt::Arg *A : Args.filtered(OPT_INPUT))
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InputFilenames.emplace_back(A->getValue());
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if (const llvm::opt::Arg *A = Args.getLastArg(OPT_convert_EQ))
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ConvertFilename = A->getValue();
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for (const llvm::opt::Arg *A : Args.filtered(OPT_arch_EQ))
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ArchFilters.emplace_back(A->getValue());
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if (const llvm::opt::Arg *A = Args.getLastArg(OPT_out_file_EQ))
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OutputFilename = A->getValue();
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if (const llvm::opt::Arg *A = Args.getLastArg(OPT_json_summary_file_EQ))
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JsonSummaryFile = A->getValue();
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Verify = Args.hasArg(OPT_verify);
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if (const llvm::opt::Arg *A = Args.getLastArg(OPT_num_threads_EQ)) {
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StringRef S{A->getValue()};
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if (!llvm::to_integer(S, NumThreads, 0)) {
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llvm::errs() << ToolName << ": for the --num-threads option: '" << S
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<< "' value invalid for uint argument!\n";
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std::exit(1);
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}
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}
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if (const llvm::opt::Arg *A = Args.getLastArg(OPT_segment_size_EQ)) {
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StringRef S{A->getValue()};
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if (!llvm::to_integer(S, SegmentSize, 0)) {
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llvm::errs() << ToolName << ": for the --segment-size option: '" << S
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<< "' value invalid for uint argument!\n";
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std::exit(1);
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}
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}
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Quiet = Args.hasArg(OPT_quiet);
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for (const llvm::opt::Arg *A : Args.filtered(OPT_address_EQ)) {
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StringRef S{A->getValue()};
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if (!llvm::to_integer(S, LookupAddresses.emplace_back(), 0)) {
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llvm::errs() << ToolName << ": for the --address option: '" << S
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<< "' value invalid for uint argument!\n";
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std::exit(1);
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}
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}
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LookupAddressesFromStdin = Args.hasArg(OPT_addresses_from_stdin);
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StoreMergedFunctionInfo = Args.hasArg(OPT_merged_functions);
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}
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/// @}
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//===----------------------------------------------------------------------===//
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static void error(Error Err) {
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if (!Err)
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return;
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WithColor::error() << toString(std::move(Err)) << "\n";
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exit(1);
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}
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static void error(StringRef Prefix, llvm::Error Err) {
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if (!Err)
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return;
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errs() << Prefix << ": " << Err << "\n";
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consumeError(std::move(Err));
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exit(1);
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}
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static void error(StringRef Prefix, std::error_code EC) {
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if (!EC)
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return;
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errs() << Prefix << ": " << EC.message() << "\n";
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exit(1);
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}
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static uint32_t getCPUType(MachOObjectFile &MachO) {
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if (MachO.is64Bit())
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return MachO.getHeader64().cputype;
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else
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return MachO.getHeader().cputype;
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}
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/// Return true if the object file has not been filtered by an --arch option.
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static bool filterArch(MachOObjectFile &Obj) {
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if (ArchFilters.empty())
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return true;
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Triple ObjTriple(Obj.getArchTriple());
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StringRef ObjArch = ObjTriple.getArchName();
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for (StringRef Arch : ArchFilters) {
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// Match name.
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if (Arch == ObjArch)
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return true;
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// Match architecture number.
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unsigned Value;
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if (!Arch.getAsInteger(0, Value))
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if (Value == getCPUType(Obj))
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return true;
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}
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return false;
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}
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/// Determine the virtual address that is considered the base address of an ELF
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/// object file.
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///
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/// The base address of an ELF file is the "p_vaddr" of the first program
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/// header whose "p_type" is PT_LOAD.
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///
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/// \param ELFFile An ELF object file we will search.
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///
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/// \returns A valid image base address if we are able to extract one.
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template <class ELFT>
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static std::optional<uint64_t>
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getImageBaseAddress(const object::ELFFile<ELFT> &ELFFile) {
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auto PhdrRangeOrErr = ELFFile.program_headers();
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if (!PhdrRangeOrErr) {
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consumeError(PhdrRangeOrErr.takeError());
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return std::nullopt;
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}
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for (const typename ELFT::Phdr &Phdr : *PhdrRangeOrErr)
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if (Phdr.p_type == ELF::PT_LOAD)
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return (uint64_t)Phdr.p_vaddr;
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return std::nullopt;
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}
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/// Determine the virtual address that is considered the base address of mach-o
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/// object file.
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///
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/// The base address of a mach-o file is the vmaddr of the "__TEXT" segment.
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///
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/// \param MachO A mach-o object file we will search.
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///
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/// \returns A valid image base address if we are able to extract one.
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static std::optional<uint64_t>
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getImageBaseAddress(const object::MachOObjectFile *MachO) {
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for (const auto &Command : MachO->load_commands()) {
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if (Command.C.cmd == MachO::LC_SEGMENT) {
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MachO::segment_command SLC = MachO->getSegmentLoadCommand(Command);
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StringRef SegName = SLC.segname;
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if (SegName == "__TEXT")
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return SLC.vmaddr;
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} else if (Command.C.cmd == MachO::LC_SEGMENT_64) {
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MachO::segment_command_64 SLC = MachO->getSegment64LoadCommand(Command);
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StringRef SegName = SLC.segname;
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if (SegName == "__TEXT")
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return SLC.vmaddr;
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}
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}
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return std::nullopt;
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}
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/// Determine the virtual address that is considered the base address of an
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/// object file.
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///
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/// Since GSYM files are used for symbolication, many clients will need to
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/// easily adjust addresses they find in stack traces so the lookups happen
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/// on unslid addresses from the original object file. If the base address of
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/// a GSYM file is set to the base address of the image, then this address
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/// adjusting is much easier.
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///
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/// \param Obj An object file we will search.
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///
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/// \returns A valid image base address if we are able to extract one.
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static std::optional<uint64_t> getImageBaseAddress(object::ObjectFile &Obj) {
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if (const auto *MachO = dyn_cast<object::MachOObjectFile>(&Obj))
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return getImageBaseAddress(MachO);
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else if (const auto *ELFObj = dyn_cast<object::ELF32LEObjectFile>(&Obj))
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return getImageBaseAddress(ELFObj->getELFFile());
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else if (const auto *ELFObj = dyn_cast<object::ELF32BEObjectFile>(&Obj))
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return getImageBaseAddress(ELFObj->getELFFile());
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else if (const auto *ELFObj = dyn_cast<object::ELF64LEObjectFile>(&Obj))
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return getImageBaseAddress(ELFObj->getELFFile());
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else if (const auto *ELFObj = dyn_cast<object::ELF64BEObjectFile>(&Obj))
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return getImageBaseAddress(ELFObj->getELFFile());
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return std::nullopt;
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}
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static llvm::Error handleObjectFile(ObjectFile &Obj, const std::string &OutFile,
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OutputAggregator &Out) {
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auto ThreadCount =
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NumThreads > 0 ? NumThreads : std::thread::hardware_concurrency();
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GsymCreator Gsym(Quiet);
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// See if we can figure out the base address for a given object file, and if
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// we can, then set the base address to use to this value. This will ease
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// symbolication since clients can slide the GSYM lookup addresses by using
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// the load bias of the shared library.
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if (auto ImageBaseAddr = getImageBaseAddress(Obj))
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Gsym.setBaseAddress(*ImageBaseAddr);
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// We need to know where the valid sections are that contain instructions.
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// See header documentation for DWARFTransformer::SetValidTextRanges() for
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// defails.
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AddressRanges TextRanges;
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for (const object::SectionRef &Sect : Obj.sections()) {
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if (!Sect.isText())
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continue;
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const uint64_t Size = Sect.getSize();
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if (Size == 0)
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continue;
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const uint64_t StartAddr = Sect.getAddress();
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TextRanges.insert(AddressRange(StartAddr, StartAddr + Size));
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}
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// Make sure there is DWARF to convert first.
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std::unique_ptr<DWARFContext> DICtx = DWARFContext::create(
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Obj,
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/*RelocAction=*/DWARFContext::ProcessDebugRelocations::Process,
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nullptr,
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/*DWPName=*/"",
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/*RecoverableErrorHandler=*/WithColor::defaultErrorHandler,
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/*WarningHandler=*/WithColor::defaultWarningHandler,
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/*ThreadSafe*/true);
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if (!DICtx)
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return createStringError(std::errc::invalid_argument,
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"unable to create DWARF context");
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// Make a DWARF transformer object and populate the ranges of the code
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// so we don't end up adding invalid functions to GSYM data.
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DwarfTransformer DT(*DICtx, Gsym);
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if (!TextRanges.empty())
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Gsym.SetValidTextRanges(TextRanges);
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// Convert all DWARF to GSYM.
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if (auto Err = DT.convert(ThreadCount, Out))
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return Err;
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// If enabled, merge functions with identical address ranges as merged
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// functions in the first FunctionInfo with that address range. Do this right
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// after loading the DWARF data so we don't have to deal with functions from
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// the symbol table.
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if (StoreMergedFunctionInfo)
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Gsym.prepareMergedFunctions(Out);
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// Get the UUID and convert symbol table to GSYM.
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if (auto Err = ObjectFileTransformer::convert(Obj, Out, Gsym))
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return Err;
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// Finalize the GSYM to make it ready to save to disk. This will remove
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// duplicate FunctionInfo entries where we might have found an entry from
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// debug info and also a symbol table entry from the object file.
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if (auto Err = Gsym.finalize(Out))
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return Err;
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// Save the GSYM file to disk.
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llvm::endianness Endian = Obj.makeTriple().isLittleEndian()
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? llvm::endianness::little
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: llvm::endianness::big;
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std::optional<uint64_t> OptSegmentSize;
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if (SegmentSize > 0)
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OptSegmentSize = SegmentSize;
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if (auto Err = Gsym.save(OutFile, Endian, OptSegmentSize))
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return Err;
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// Verify the DWARF if requested. This will ensure all the info in the DWARF
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// can be looked up in the GSYM and that all lookups get matching data.
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if (Verify) {
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if (auto Err = DT.verify(OutFile, Out))
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return Err;
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}
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return Error::success();
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}
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static llvm::Error handleBuffer(StringRef Filename, MemoryBufferRef Buffer,
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const std::string &OutFile,
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OutputAggregator &Out) {
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Expected<std::unique_ptr<Binary>> BinOrErr = object::createBinary(Buffer);
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error(Filename, errorToErrorCode(BinOrErr.takeError()));
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if (auto *Obj = dyn_cast<ObjectFile>(BinOrErr->get())) {
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Triple ObjTriple(Obj->makeTriple());
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auto ArchName = ObjTriple.getArchName();
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outs() << "Output file (" << ArchName << "): " << OutFile << "\n";
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if (auto Err = handleObjectFile(*Obj, OutFile, Out))
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return Err;
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} else if (auto *Fat = dyn_cast<MachOUniversalBinary>(BinOrErr->get())) {
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// Iterate over all contained architectures and filter out any that were
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// not specified with the "--arch <arch>" option. If the --arch option was
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// not specified on the command line, we will process all architectures.
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std::vector<std::unique_ptr<MachOObjectFile>> FilterObjs;
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for (auto &ObjForArch : Fat->objects()) {
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if (auto MachOOrErr = ObjForArch.getAsObjectFile()) {
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auto &Obj = **MachOOrErr;
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if (filterArch(Obj))
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FilterObjs.emplace_back(MachOOrErr->release());
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} else {
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error(Filename, MachOOrErr.takeError());
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}
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}
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if (FilterObjs.empty())
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error(Filename, createStringError(std::errc::invalid_argument,
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"no matching architectures found"));
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// Now handle each architecture we need to convert.
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for (auto &Obj : FilterObjs) {
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Triple ObjTriple(Obj->getArchTriple());
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auto ArchName = ObjTriple.getArchName();
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std::string ArchOutFile(OutFile);
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// If we are only handling a single architecture, then we will use the
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// normal output file. If we are handling multiple architectures append
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// the architecture name to the end of the out file path so that we
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// don't overwrite the previous architecture's gsym file.
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if (FilterObjs.size() > 1) {
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ArchOutFile.append(1, '.');
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ArchOutFile.append(ArchName.str());
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}
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outs() << "Output file (" << ArchName << "): " << ArchOutFile << "\n";
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if (auto Err = handleObjectFile(*Obj, ArchOutFile, Out))
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return Err;
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}
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}
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return Error::success();
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}
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static llvm::Error handleFileConversionToGSYM(StringRef Filename,
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const std::string &OutFile,
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OutputAggregator &Out) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> BuffOrErr =
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MemoryBuffer::getFileOrSTDIN(Filename);
|
|
error(Filename, BuffOrErr.getError());
|
|
std::unique_ptr<MemoryBuffer> Buffer = std::move(BuffOrErr.get());
|
|
return handleBuffer(Filename, *Buffer, OutFile, Out);
|
|
}
|
|
|
|
static llvm::Error convertFileToGSYM(OutputAggregator &Out) {
|
|
// Expand any .dSYM bundles to the individual object files contained therein.
|
|
std::vector<std::string> Objects;
|
|
std::string OutFile = OutputFilename;
|
|
if (OutFile.empty()) {
|
|
OutFile = ConvertFilename;
|
|
OutFile += ".gsym";
|
|
}
|
|
|
|
Out << "Input file: " << ConvertFilename << "\n";
|
|
|
|
if (auto DsymObjectsOrErr =
|
|
MachOObjectFile::findDsymObjectMembers(ConvertFilename)) {
|
|
if (DsymObjectsOrErr->empty())
|
|
Objects.push_back(ConvertFilename);
|
|
else
|
|
llvm::append_range(Objects, *DsymObjectsOrErr);
|
|
} else {
|
|
error(DsymObjectsOrErr.takeError());
|
|
}
|
|
|
|
for (StringRef Object : Objects)
|
|
if (Error Err = handleFileConversionToGSYM(Object, OutFile, Out))
|
|
return Err;
|
|
return Error::success();
|
|
}
|
|
|
|
static void doLookup(GsymReader &Gsym, uint64_t Addr, raw_ostream &OS) {
|
|
if (auto Result = Gsym.lookup(Addr)) {
|
|
// If verbose is enabled dump the full function info for the address.
|
|
if (Verbose) {
|
|
if (auto FI = Gsym.getFunctionInfo(Addr)) {
|
|
OS << "FunctionInfo for " << HEX64(Addr) << ":\n";
|
|
Gsym.dump(OS, *FI);
|
|
OS << "\nLookupResult for " << HEX64(Addr) << ":\n";
|
|
}
|
|
}
|
|
OS << Result.get();
|
|
} else {
|
|
if (Verbose)
|
|
OS << "\nLookupResult for " << HEX64(Addr) << ":\n";
|
|
OS << HEX64(Addr) << ": ";
|
|
logAllUnhandledErrors(Result.takeError(), OS, "error: ");
|
|
}
|
|
if (Verbose)
|
|
OS << "\n";
|
|
}
|
|
|
|
int llvm_gsymutil_main(int argc, char **argv, const llvm::ToolContext &) {
|
|
// Print a stack trace if we signal out.
|
|
sys::PrintStackTraceOnErrorSignal(argv[0]);
|
|
PrettyStackTraceProgram X(argc, argv);
|
|
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
|
|
|
|
llvm::InitializeAllTargets();
|
|
|
|
parseArgs(argc, argv);
|
|
|
|
raw_ostream &OS = outs();
|
|
|
|
OutputAggregator Aggregation(&OS);
|
|
if (!ConvertFilename.empty()) {
|
|
// Convert DWARF to GSYM
|
|
if (!InputFilenames.empty()) {
|
|
OS << "error: no input files can be specified when using the --convert "
|
|
"option.\n";
|
|
return 1;
|
|
}
|
|
// Call error() if we have an error and it will exit with a status of 1
|
|
if (auto Err = convertFileToGSYM(Aggregation))
|
|
error("DWARF conversion failed: ", std::move(Err));
|
|
|
|
// Report the errors from aggregator:
|
|
Aggregation.EnumerateResults([&](StringRef category, unsigned count) {
|
|
OS << category << " occurred " << count << " time(s)\n";
|
|
});
|
|
if (!JsonSummaryFile.empty()) {
|
|
std::error_code EC;
|
|
raw_fd_ostream JsonStream(JsonSummaryFile, EC, sys::fs::OF_Text);
|
|
if (EC) {
|
|
OS << "error opening aggregate error json file '" << JsonSummaryFile
|
|
<< "' for writing: " << EC.message() << '\n';
|
|
return 1;
|
|
}
|
|
|
|
llvm::json::Object Categories;
|
|
uint64_t ErrorCount = 0;
|
|
Aggregation.EnumerateResults([&](StringRef Category, unsigned Count) {
|
|
llvm::json::Object Val;
|
|
Val.try_emplace("count", Count);
|
|
Categories.try_emplace(Category, std::move(Val));
|
|
ErrorCount += Count;
|
|
});
|
|
llvm::json::Object RootNode;
|
|
RootNode.try_emplace("error-categories", std::move(Categories));
|
|
RootNode.try_emplace("error-count", ErrorCount);
|
|
|
|
JsonStream << llvm::json::Value(std::move(RootNode));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (LookupAddressesFromStdin) {
|
|
if (!LookupAddresses.empty() || !InputFilenames.empty()) {
|
|
OS << "error: no input files or addresses can be specified when using "
|
|
"the --addresses-from-stdin "
|
|
"option.\n";
|
|
return 1;
|
|
}
|
|
|
|
std::string InputLine;
|
|
std::string CurrentGSYMPath;
|
|
std::optional<Expected<GsymReader>> CurrentGsym;
|
|
|
|
while (std::getline(std::cin, InputLine)) {
|
|
// Strip newline characters.
|
|
std::string StrippedInputLine(InputLine);
|
|
llvm::erase_if(StrippedInputLine,
|
|
[](char c) { return c == '\r' || c == '\n'; });
|
|
|
|
StringRef AddrStr, GSYMPath;
|
|
std::tie(AddrStr, GSYMPath) =
|
|
llvm::StringRef{StrippedInputLine}.split(' ');
|
|
|
|
if (GSYMPath != CurrentGSYMPath) {
|
|
CurrentGsym = GsymReader::openFile(GSYMPath);
|
|
if (!*CurrentGsym)
|
|
error(GSYMPath, CurrentGsym->takeError());
|
|
CurrentGSYMPath = GSYMPath;
|
|
}
|
|
|
|
uint64_t Addr;
|
|
if (AddrStr.getAsInteger(0, Addr)) {
|
|
OS << "error: invalid address " << AddrStr
|
|
<< ", expected: Address GsymFile.\n";
|
|
return 1;
|
|
}
|
|
|
|
doLookup(**CurrentGsym, Addr, OS);
|
|
|
|
OS << "\n";
|
|
OS.flush();
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
// Dump or access data inside GSYM files
|
|
for (const auto &GSYMPath : InputFilenames) {
|
|
auto Gsym = GsymReader::openFile(GSYMPath);
|
|
if (!Gsym)
|
|
error(GSYMPath, Gsym.takeError());
|
|
|
|
if (LookupAddresses.empty()) {
|
|
Gsym->dump(outs());
|
|
continue;
|
|
}
|
|
|
|
// Lookup an address in a GSYM file and print any matches.
|
|
OS << "Looking up addresses in \"" << GSYMPath << "\":\n";
|
|
for (auto Addr : LookupAddresses) {
|
|
doLookup(*Gsym, Addr, OS);
|
|
}
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|