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Diffstat (limited to 'llvm/include/llvm/Object/FaultMapParser.h')
-rw-r--r-- | llvm/include/llvm/Object/FaultMapParser.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/llvm/include/llvm/Object/FaultMapParser.h b/llvm/include/llvm/Object/FaultMapParser.h new file mode 100644 index 000000000000..4d1f0397a0dd --- /dev/null +++ b/llvm/include/llvm/Object/FaultMapParser.h @@ -0,0 +1,167 @@ +//===-- FaultMapParser.h - Parser for the "FaultMaps" section --*- C++ -*-===// +// +// 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 +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_OBJECT_FAULTMAPPARSER_H +#define LLVM_OBJECT_FAULTMAPPARSER_H + +#include "llvm/Support/Endian.h" +#include <cassert> +#include <cstdint> + +namespace llvm { + +class raw_ostream; + +/// A parser for the __llvm_faultmaps section generated by the FaultMaps class +/// declared in llvm/CodeGen/FaultMaps.h. This parser is version locked with +/// with the __llvm_faultmaps section generated by the version of LLVM that +/// includes it. No guarantees are made with respect to forward or backward +/// compatibility. +class FaultMapParser { + using FaultMapVersionType = uint8_t; + using Reserved0Type = uint8_t; + using Reserved1Type = uint16_t; + using NumFunctionsType = uint32_t; + + static const size_t FaultMapVersionOffset = 0; + static const size_t Reserved0Offset = + FaultMapVersionOffset + sizeof(FaultMapVersionType); + static const size_t Reserved1Offset = Reserved0Offset + sizeof(Reserved0Type); + static const size_t NumFunctionsOffset = + Reserved1Offset + sizeof(Reserved1Type); + static const size_t FunctionInfosOffset = + NumFunctionsOffset + sizeof(NumFunctionsType); + + const uint8_t *P; + const uint8_t *E; + + template <typename T> static T read(const uint8_t *P, const uint8_t *E) { + assert(P + sizeof(T) <= E && "out of bounds read!"); + return support::endian::read<T, support::little, 1>(P); + } + +public: + enum FaultKind { + FaultingLoad = 1, + FaultingLoadStore, + FaultingStore, + FaultKindMax + }; + + class FunctionFaultInfoAccessor { + using FaultKindType = uint32_t; + using FaultingPCOffsetType = uint32_t; + using HandlerPCOffsetType = uint32_t; + + static const size_t FaultKindOffset = 0; + static const size_t FaultingPCOffsetOffset = + FaultKindOffset + sizeof(FaultKindType); + static const size_t HandlerPCOffsetOffset = + FaultingPCOffsetOffset + sizeof(FaultingPCOffsetType); + + const uint8_t *P; + const uint8_t *E; + + public: + static const size_t Size = + HandlerPCOffsetOffset + sizeof(HandlerPCOffsetType); + + explicit FunctionFaultInfoAccessor(const uint8_t *P, const uint8_t *E) + : P(P), E(E) {} + + FaultKindType getFaultKind() const { + return read<FaultKindType>(P + FaultKindOffset, E); + } + + FaultingPCOffsetType getFaultingPCOffset() const { + return read<FaultingPCOffsetType>(P + FaultingPCOffsetOffset, E); + } + + HandlerPCOffsetType getHandlerPCOffset() const { + return read<HandlerPCOffsetType>(P + HandlerPCOffsetOffset, E); + } + }; + + class FunctionInfoAccessor { + using FunctionAddrType = uint64_t; + using NumFaultingPCsType = uint32_t; + using ReservedType = uint32_t; + + static const size_t FunctionAddrOffset = 0; + static const size_t NumFaultingPCsOffset = + FunctionAddrOffset + sizeof(FunctionAddrType); + static const size_t ReservedOffset = + NumFaultingPCsOffset + sizeof(NumFaultingPCsType); + static const size_t FunctionFaultInfosOffset = + ReservedOffset + sizeof(ReservedType); + static const size_t FunctionInfoHeaderSize = FunctionFaultInfosOffset; + + const uint8_t *P = nullptr; + const uint8_t *E = nullptr; + + public: + FunctionInfoAccessor() = default; + + explicit FunctionInfoAccessor(const uint8_t *P, const uint8_t *E) + : P(P), E(E) {} + + FunctionAddrType getFunctionAddr() const { + return read<FunctionAddrType>(P + FunctionAddrOffset, E); + } + + NumFaultingPCsType getNumFaultingPCs() const { + return read<NumFaultingPCsType>(P + NumFaultingPCsOffset, E); + } + + FunctionFaultInfoAccessor getFunctionFaultInfoAt(uint32_t Index) const { + assert(Index < getNumFaultingPCs() && "index out of bounds!"); + const uint8_t *Begin = P + FunctionFaultInfosOffset + + FunctionFaultInfoAccessor::Size * Index; + return FunctionFaultInfoAccessor(Begin, E); + } + + FunctionInfoAccessor getNextFunctionInfo() const { + size_t MySize = FunctionInfoHeaderSize + + getNumFaultingPCs() * FunctionFaultInfoAccessor::Size; + + const uint8_t *Begin = P + MySize; + assert(Begin < E && "out of bounds!"); + return FunctionInfoAccessor(Begin, E); + } + }; + + explicit FaultMapParser(const uint8_t *Begin, const uint8_t *End) + : P(Begin), E(End) {} + + FaultMapVersionType getFaultMapVersion() const { + auto Version = read<FaultMapVersionType>(P + FaultMapVersionOffset, E); + assert(Version == 1 && "only version 1 supported!"); + return Version; + } + + NumFunctionsType getNumFunctions() const { + return read<NumFunctionsType>(P + NumFunctionsOffset, E); + } + + FunctionInfoAccessor getFirstFunctionInfo() const { + const uint8_t *Begin = P + FunctionInfosOffset; + return FunctionInfoAccessor(Begin, E); + } +}; + +raw_ostream &operator<<(raw_ostream &OS, + const FaultMapParser::FunctionFaultInfoAccessor &); + +raw_ostream &operator<<(raw_ostream &OS, + const FaultMapParser::FunctionInfoAccessor &); + +raw_ostream &operator<<(raw_ostream &OS, const FaultMapParser &); + +} // namespace llvm + +#endif |