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47a31a63f5
Follow-up of D78082 and D78590. Otherwise, because xray_instr_map is now read-only, the absolute relocation used for Sled.Function will cause a text relocation.
101 lines
4.2 KiB
C++
101 lines
4.2 KiB
C++
//===- xray-extract.cpp: XRay Instrumentation Map Extraction --------------===//
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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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// Implementation of the xray-extract.h interface.
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//
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// FIXME: Support other XRay-instrumented binary formats other than ELF.
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//
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//===----------------------------------------------------------------------===//
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#include "func-id-helper.h"
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#include "xray-registry.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/XRay/InstrumentationMap.h"
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using namespace llvm;
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using namespace llvm::xray;
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using namespace llvm::yaml;
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// llvm-xray extract
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// ----------------------------------------------------------------------------
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static cl::SubCommand Extract("extract", "Extract instrumentation maps");
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static cl::opt<std::string> ExtractInput(cl::Positional,
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cl::desc("<input file>"), cl::Required,
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cl::sub(Extract));
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static cl::opt<std::string>
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ExtractOutput("output", cl::value_desc("output file"), cl::init("-"),
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cl::desc("output file; use '-' for stdout"),
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cl::sub(Extract));
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static cl::alias ExtractOutput2("o", cl::aliasopt(ExtractOutput),
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cl::desc("Alias for -output"));
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static cl::opt<bool> ExtractSymbolize("symbolize", cl::value_desc("symbolize"),
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cl::init(false),
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cl::desc("symbolize functions"),
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cl::sub(Extract));
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static cl::alias ExtractSymbolize2("s", cl::aliasopt(ExtractSymbolize),
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cl::desc("alias for -symbolize"));
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static cl::opt<bool> ExtractNoDemangle("no-demangle",
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cl::value_desc("no-demangle"),
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cl::init(false),
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cl::desc("don't demangle symbols"),
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cl::sub(Extract));
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namespace {
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void exportAsYAML(const InstrumentationMap &Map, raw_ostream &OS,
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FuncIdConversionHelper &FH) {
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// First we translate the sleds into the YAMLXRaySledEntry objects in a deque.
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std::vector<YAMLXRaySledEntry> YAMLSleds;
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auto Sleds = Map.sleds();
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YAMLSleds.reserve(std::distance(Sleds.begin(), Sleds.end()));
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for (const auto &Sled : Sleds) {
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auto FuncId = Map.getFunctionId(Sled.Function);
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if (!FuncId)
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return;
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YAMLSleds.push_back(
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{*FuncId, Sled.Address, Sled.Function, Sled.Kind, Sled.AlwaysInstrument,
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ExtractSymbolize ? FH.SymbolOrNumber(*FuncId) : "", Sled.Version});
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}
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Output Out(OS, nullptr, 0);
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Out << YAMLSleds;
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}
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} // namespace
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static CommandRegistration Unused(&Extract, []() -> Error {
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auto InstrumentationMapOrError = loadInstrumentationMap(ExtractInput);
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if (!InstrumentationMapOrError)
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return joinErrors(make_error<StringError>(
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Twine("Cannot extract instrumentation map from '") +
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ExtractInput + "'.",
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std::make_error_code(std::errc::invalid_argument)),
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InstrumentationMapOrError.takeError());
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std::error_code EC;
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raw_fd_ostream OS(ExtractOutput, EC, sys::fs::OpenFlags::OF_Text);
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if (EC)
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return make_error<StringError>(
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Twine("Cannot open file '") + ExtractOutput + "' for writing.", EC);
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const auto &FunctionAddresses =
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InstrumentationMapOrError->getFunctionAddresses();
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symbolize::LLVMSymbolizer::Options opts;
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if (ExtractNoDemangle)
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opts.Demangle = false;
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symbolize::LLVMSymbolizer Symbolizer(opts);
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llvm::xray::FuncIdConversionHelper FuncIdHelper(ExtractInput, Symbolizer,
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FunctionAddresses);
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exportAsYAML(*InstrumentationMapOrError, OS, FuncIdHelper);
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return Error::success();
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});
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