1 //===- xray-extract.cpp: XRay Instrumentation Map Extraction --------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // Implementation of the xray-extract.h interface. 10 // 11 // FIXME: Support other XRay-instrumented binary formats other than ELF. 12 // 13 //===----------------------------------------------------------------------===// 14 15 16 #include "func-id-helper.h" 17 #include "xray-registry.h" 18 #include "llvm/Object/ObjectFile.h" 19 #include "llvm/Support/CommandLine.h" 20 #include "llvm/Support/Error.h" 21 #include "llvm/Support/FileSystem.h" 22 #include "llvm/Support/Format.h" 23 #include "llvm/Support/raw_ostream.h" 24 #include "llvm/XRay/InstrumentationMap.h" 25 26 using namespace llvm; 27 using namespace llvm::xray; 28 using namespace llvm::yaml; 29 30 // llvm-xray extract 31 // ---------------------------------------------------------------------------- 32 static cl::SubCommand Extract("extract", "Extract instrumentation maps"); 33 static cl::opt<std::string> ExtractInput(cl::Positional, 34 cl::desc("<input file>"), cl::Required, 35 cl::sub(Extract)); 36 static cl::opt<std::string> 37 ExtractOutput("output", cl::value_desc("output file"), cl::init("-"), 38 cl::desc("output file; use '-' for stdout"), 39 cl::sub(Extract)); 40 static cl::alias ExtractOutput2("o", cl::aliasopt(ExtractOutput), 41 cl::desc("Alias for -output")); 42 static cl::opt<bool> ExtractSymbolize("symbolize", cl::value_desc("symbolize"), 43 cl::init(false), 44 cl::desc("symbolize functions"), 45 cl::sub(Extract)); 46 static cl::alias ExtractSymbolize2("s", cl::aliasopt(ExtractSymbolize), 47 cl::desc("alias for -symbolize")); 48 static cl::opt<bool> ExtractNoDemangle("no-demangle", 49 cl::value_desc("no-demangle"), 50 cl::init(false), 51 cl::desc("don't demangle symbols"), 52 cl::sub(Extract)); 53 54 namespace { 55 56 void exportAsYAML(const InstrumentationMap &Map, raw_ostream &OS, 57 FuncIdConversionHelper &FH) { 58 // First we translate the sleds into the YAMLXRaySledEntry objects in a deque. 59 std::vector<YAMLXRaySledEntry> YAMLSleds; 60 auto Sleds = Map.sleds(); 61 YAMLSleds.reserve(std::distance(Sleds.begin(), Sleds.end())); 62 for (const auto &Sled : Sleds) { 63 auto FuncId = Map.getFunctionId(Sled.Function); 64 if (!FuncId) 65 return; 66 YAMLSleds.push_back( 67 {*FuncId, Sled.Address, Sled.Function, Sled.Kind, Sled.AlwaysInstrument, 68 ExtractSymbolize ? FH.SymbolOrNumber(*FuncId) : "", Sled.Version}); 69 } 70 Output Out(OS, nullptr, 0); 71 Out << YAMLSleds; 72 } 73 74 } // namespace 75 76 static CommandRegistration Unused(&Extract, []() -> Error { 77 auto InstrumentationMapOrError = loadInstrumentationMap(ExtractInput); 78 if (!InstrumentationMapOrError) 79 return joinErrors(make_error<StringError>( 80 Twine("Cannot extract instrumentation map from '") + 81 ExtractInput + "'.", 82 std::make_error_code(std::errc::invalid_argument)), 83 InstrumentationMapOrError.takeError()); 84 85 std::error_code EC; 86 raw_fd_ostream OS(ExtractOutput, EC, sys::fs::OpenFlags::OF_Text); 87 if (EC) 88 return make_error<StringError>( 89 Twine("Cannot open file '") + ExtractOutput + "' for writing.", EC); 90 const auto &FunctionAddresses = 91 InstrumentationMapOrError->getFunctionAddresses(); 92 symbolize::LLVMSymbolizer::Options opts; 93 if (ExtractNoDemangle) 94 opts.Demangle = false; 95 symbolize::LLVMSymbolizer Symbolizer(opts); 96 llvm::xray::FuncIdConversionHelper FuncIdHelper(ExtractInput, Symbolizer, 97 FunctionAddresses); 98 exportAsYAML(*InstrumentationMapOrError, OS, FuncIdHelper); 99 return Error::success(); 100 }); 101