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139 lines
4.4 KiB
C++
139 lines
4.4 KiB
C++
//===- InstrumentationMap.h - XRay Instrumentation Map ----------*- C++ -*-===//
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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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// Defines the interface for extracting the instrumentation map from an
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// XRay-instrumented binary.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_XRAY_INSTRUMENTATIONMAP_H
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#define LLVM_XRAY_INSTRUMENTATIONMAP_H
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/YAMLTraits.h"
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#include <cstdint>
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#include <unordered_map>
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#include <vector>
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namespace llvm {
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namespace xray {
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// Forward declare to make a friend.
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class InstrumentationMap;
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/// Loads the instrumentation map from |Filename|. This auto-deduces the type of
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/// the instrumentation map.
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Expected<InstrumentationMap> loadInstrumentationMap(StringRef Filename);
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/// Represents an XRay instrumentation sled entry from an object file.
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struct SledEntry {
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/// Each entry here represents the kinds of supported instrumentation map
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/// entries.
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enum class FunctionKinds { ENTRY, EXIT, TAIL, LOG_ARGS_ENTER, CUSTOM_EVENT };
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/// The address of the sled.
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uint64_t Address;
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/// The address of the function.
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uint64_t Function;
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/// The kind of sled.
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FunctionKinds Kind;
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/// Whether the sled was annotated to always be instrumented.
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bool AlwaysInstrument;
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unsigned char Version;
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};
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struct YAMLXRaySledEntry {
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int32_t FuncId;
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yaml::Hex64 Address;
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yaml::Hex64 Function;
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SledEntry::FunctionKinds Kind;
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bool AlwaysInstrument;
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std::string FunctionName;
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unsigned char Version;
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};
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/// The InstrumentationMap represents the computed function id's and indicated
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/// function addresses from an object file (or a YAML file). This provides an
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/// interface to just the mapping between the function id, and the function
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/// address.
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///
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/// We also provide raw access to the actual instrumentation map entries we find
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/// associated with a particular object file.
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///
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class InstrumentationMap {
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public:
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using FunctionAddressMap = std::unordered_map<int32_t, uint64_t>;
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using FunctionAddressReverseMap = std::unordered_map<uint64_t, int32_t>;
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using SledContainer = std::vector<SledEntry>;
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private:
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SledContainer Sleds;
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FunctionAddressMap FunctionAddresses;
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FunctionAddressReverseMap FunctionIds;
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friend Expected<InstrumentationMap> loadInstrumentationMap(StringRef);
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public:
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/// Provides a raw accessor to the unordered map of function addresses.
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const FunctionAddressMap &getFunctionAddresses() { return FunctionAddresses; }
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/// Returns an XRay computed function id, provided a function address.
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Optional<int32_t> getFunctionId(uint64_t Addr) const;
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/// Returns the function address for a function id.
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Optional<uint64_t> getFunctionAddr(int32_t FuncId) const;
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/// Provide read-only access to the entries of the instrumentation map.
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const SledContainer &sleds() const { return Sleds; };
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};
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} // end namespace xray
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namespace yaml {
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template <> struct ScalarEnumerationTraits<xray::SledEntry::FunctionKinds> {
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static void enumeration(IO &IO, xray::SledEntry::FunctionKinds &Kind) {
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IO.enumCase(Kind, "function-enter", xray::SledEntry::FunctionKinds::ENTRY);
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IO.enumCase(Kind, "function-exit", xray::SledEntry::FunctionKinds::EXIT);
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IO.enumCase(Kind, "tail-exit", xray::SledEntry::FunctionKinds::TAIL);
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IO.enumCase(Kind, "log-args-enter",
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xray::SledEntry::FunctionKinds::LOG_ARGS_ENTER);
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IO.enumCase(Kind, "custom-event",
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xray::SledEntry::FunctionKinds::CUSTOM_EVENT);
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}
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};
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template <> struct MappingTraits<xray::YAMLXRaySledEntry> {
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static void mapping(IO &IO, xray::YAMLXRaySledEntry &Entry) {
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IO.mapRequired("id", Entry.FuncId);
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IO.mapRequired("address", Entry.Address);
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IO.mapRequired("function", Entry.Function);
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IO.mapRequired("kind", Entry.Kind);
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IO.mapRequired("always-instrument", Entry.AlwaysInstrument);
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IO.mapOptional("function-name", Entry.FunctionName);
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IO.mapOptional("version", Entry.Version, 0);
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}
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static constexpr bool flow = true;
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};
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} // end namespace yaml
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} // end namespace llvm
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LLVM_YAML_IS_SEQUENCE_VECTOR(xray::YAMLXRaySledEntry)
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#endif // LLVM_XRAY_INSTRUMENTATIONMAP_H
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