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e235fcb582
Bolt currently links and initializes all LLVM targets. This substantially increases the binary size, and link time if LTO is used. Instead, only link the targets specified by BOLT_TARGETS_TO_BUILD. We also have to only initialize those targets, so generate a TargetConfig.def file with the necessary information. The way the initialization is done mirrors what llvm-exegesis does. This reduces llvm-bolt size from 137MB to 78MB for me.
125 lines
4.4 KiB
C++
125 lines
4.4 KiB
C++
//===- bolt/tools/binary-analysis/binary-analysis.cpp ---------------------===//
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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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//
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// This is a generic binary analysis tool, where multiple different specific
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// binary analyses can be plugged in to. The binary analyses are mostly built
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// on top of BOLT components.
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//
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//===----------------------------------------------------------------------===//
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#include "bolt/Rewrite/RewriteInstance.h"
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#include "bolt/Utils/CommandLineOpts.h"
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#include "llvm/MC/TargetRegistry.h"
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#include "llvm/Object/Binary.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Program.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/VirtualFileSystem.h"
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#define DEBUG_TYPE "bolt"
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using namespace llvm;
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using namespace object;
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using namespace bolt;
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namespace opts {
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static cl::OptionCategory *BinaryAnalysisCategories[] = {
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&BinaryAnalysisCategory};
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static cl::opt<std::string> InputFilename(cl::Positional,
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cl::desc("<executable>"),
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cl::Required,
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cl::cat(BinaryAnalysisCategory),
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cl::sub(cl::SubCommand::getAll()));
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} // namespace opts
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static StringRef ToolName = "llvm-bolt-binary-analysis";
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static void report_error(StringRef Message, std::error_code EC) {
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assert(EC);
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errs() << ToolName << ": '" << Message << "': " << EC.message() << ".\n";
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exit(1);
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}
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static void report_error(StringRef Message, Error E) {
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assert(E);
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errs() << ToolName << ": '" << Message << "': " << toString(std::move(E))
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<< ".\n";
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exit(1);
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}
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void ParseCommandLine(int argc, char **argv) {
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cl::HideUnrelatedOptions(ArrayRef(opts::BinaryAnalysisCategories));
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// Register the target printer for --version.
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cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
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cl::ParseCommandLineOptions(argc, argv, "BinaryAnalysis\n");
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}
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static std::string GetExecutablePath(const char *Argv0) {
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SmallString<256> ExecutablePath(Argv0);
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// Do a PATH lookup if Argv0 isn't a valid path.
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if (!llvm::sys::fs::exists(ExecutablePath))
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if (llvm::ErrorOr<std::string> P =
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llvm::sys::findProgramByName(ExecutablePath))
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ExecutablePath = *P;
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return std::string(ExecutablePath.str());
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}
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal(argv[0]);
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PrettyStackTraceProgram X(argc, argv);
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std::string ToolPath = GetExecutablePath(argv[0]);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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// Initialize targets and assembly printers/parsers.
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#define BOLT_TARGET(target) \
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LLVMInitialize##target##TargetInfo(); \
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LLVMInitialize##target##TargetMC(); \
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LLVMInitialize##target##AsmParser(); \
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LLVMInitialize##target##Disassembler(); \
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LLVMInitialize##target##Target(); \
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LLVMInitialize##target##AsmPrinter();
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#include "bolt/Core/TargetConfig.def"
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ParseCommandLine(argc, argv);
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opts::BinaryAnalysisMode = true;
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if (!sys::fs::exists(opts::InputFilename))
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report_error(opts::InputFilename, errc::no_such_file_or_directory);
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Expected<OwningBinary<Binary>> BinaryOrErr =
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createBinary(opts::InputFilename);
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if (Error E = BinaryOrErr.takeError())
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report_error(opts::InputFilename, std::move(E));
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Binary &Binary = *BinaryOrErr.get().getBinary();
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if (auto *e = dyn_cast<ELFObjectFileBase>(&Binary)) {
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auto RIOrErr = RewriteInstance::create(e, argc, argv, ToolPath);
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if (Error E = RIOrErr.takeError())
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report_error(opts::InputFilename, std::move(E));
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RewriteInstance &RI = *RIOrErr.get();
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if (Error E = RI.run())
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report_error(opts::InputFilename, std::move(E));
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}
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return EXIT_SUCCESS;
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}
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