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//===- xray-extract.cpp: XRay Instrumentation Map Extraction --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Implementation of the xray-extract.h interface.
//
// FIXME: Support other XRay-instrumented binary formats other than ELF.
//
//===----------------------------------------------------------------------===//
#include "func-id-helper.h"
#include "xray-registry.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/XRay/InstrumentationMap.h"
using namespace llvm;
using namespace llvm::xray;
using namespace llvm::yaml;
// llvm-xray extract
// ----------------------------------------------------------------------------
static cl::SubCommand Extract("extract", "Extract instrumentation maps");
static cl::opt<std::string> ExtractInput(cl::Positional,
cl::desc("<input file>"), cl::Required,
cl::sub(Extract));
static cl::opt<std::string>
ExtractOutput("output", cl::value_desc("output file"), cl::init("-"),
cl::desc("output file; use '-' for stdout"),
cl::sub(Extract));
static cl::alias ExtractOutput2("o", cl::aliasopt(ExtractOutput),
cl::desc("Alias for -output"));
static cl::opt<bool> ExtractSymbolize("symbolize", cl::value_desc("symbolize"),
cl::init(false),
cl::desc("symbolize functions"),
cl::sub(Extract));
static cl::alias ExtractSymbolize2("s", cl::aliasopt(ExtractSymbolize),
cl::desc("alias for -symbolize"));
static cl::opt<bool> Demangle("demangle",
cl::desc("demangle symbols (default)"),
cl::sub(Extract));
static cl::opt<bool> NoDemangle("no-demangle",
cl::desc("don't demangle symbols"),
cl::sub(Extract));
namespace {
void exportAsYAML(const InstrumentationMap &Map, raw_ostream &OS,
FuncIdConversionHelper &FH) {
// First we translate the sleds into the YAMLXRaySledEntry objects in a deque.
std::vector<YAMLXRaySledEntry> YAMLSleds;
auto Sleds = Map.sleds();
YAMLSleds.reserve(std::distance(Sleds.begin(), Sleds.end()));
for (const auto &Sled : Sleds) {
auto FuncId = Map.getFunctionId(Sled.Function);
if (!FuncId)
return;
YAMLSleds.push_back(
{*FuncId, Sled.Address, Sled.Function, Sled.Kind, Sled.AlwaysInstrument,
ExtractSymbolize ? FH.SymbolOrNumber(*FuncId) : "", Sled.Version});
}
Output Out(OS, nullptr, 0);
Out << YAMLSleds;
}
} // namespace
static CommandRegistration Unused(&Extract, []() -> Error {
auto InstrumentationMapOrError = loadInstrumentationMap(ExtractInput);
if (!InstrumentationMapOrError)
return joinErrors(make_error<StringError>(
Twine("Cannot extract instrumentation map from '") +
ExtractInput + "'.",
std::make_error_code(std::errc::invalid_argument)),
InstrumentationMapOrError.takeError());
std::error_code EC;
raw_fd_ostream OS(ExtractOutput, EC, sys::fs::OpenFlags::OF_TextWithCRLF);
if (EC)
return make_error<StringError>(
Twine("Cannot open file '") + ExtractOutput + "' for writing.", EC);
const auto &FunctionAddresses =
InstrumentationMapOrError->getFunctionAddresses();
symbolize::LLVMSymbolizer::Options opts;
if (Demangle.getPosition() < NoDemangle.getPosition())
opts.Demangle = false;
symbolize::LLVMSymbolizer Symbolizer(opts);
llvm::xray::FuncIdConversionHelper FuncIdHelper(ExtractInput, Symbolizer,
FunctionAddresses);
exportAsYAML(*InstrumentationMapOrError, OS, FuncIdHelper);
return Error::success();
});
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