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Diffstat (limited to 'lib/ExecutionEngine/JITLink/EHFrameSupportImpl.h')
| -rw-r--r-- | lib/ExecutionEngine/JITLink/EHFrameSupportImpl.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/JITLink/EHFrameSupportImpl.h b/lib/ExecutionEngine/JITLink/EHFrameSupportImpl.h new file mode 100644 index 000000000000..d679edef7ea6 --- /dev/null +++ b/lib/ExecutionEngine/JITLink/EHFrameSupportImpl.h @@ -0,0 +1,72 @@ +//===------- EHFrameSupportImpl.h - JITLink eh-frame utils ------*- 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 +// +//===----------------------------------------------------------------------===// +// +// EHFrame registration support for JITLink. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H +#define LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H + +#include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h" + +#include "llvm/ExecutionEngine/JITLink/JITLink.h" +#include "llvm/Support/BinaryStreamReader.h" + +namespace llvm { +namespace jitlink { + +/// A generic parser for eh-frame sections. +/// +/// Adds atoms representing CIE and FDE entries, using the given FDE-to-CIE and +/// FDEToTarget relocation kinds. +class EHFrameParser { +public: + EHFrameParser(AtomGraph &G, Section &EHFrameSection, StringRef EHFrameContent, + JITTargetAddress EHFrameAddress, Edge::Kind FDEToCIERelocKind, + Edge::Kind FDEToTargetRelocKind); + Error atomize(); + +private: + struct AugmentationInfo { + bool AugmentationDataPresent = false; + bool EHDataFieldPresent = false; + uint8_t Fields[4] = {0x0, 0x0, 0x0, 0x0}; + }; + + Expected<AugmentationInfo> parseAugmentationString(); + Expected<JITTargetAddress> readAbsolutePointer(); + Error processCIE(); + Error processFDE(JITTargetAddress CIEPointerAddress, uint32_t CIEPointer); + + struct CIEInformation { + CIEInformation() = default; + CIEInformation(DefinedAtom &CIEAtom) : CIEAtom(&CIEAtom) {} + DefinedAtom *CIEAtom = nullptr; + bool FDEsHaveLSDAField = false; + }; + + AtomGraph &G; + Section &EHFrameSection; + StringRef EHFrameContent; + JITTargetAddress EHFrameAddress; + BinaryStreamReader EHFrameReader; + DefinedAtom *CurRecordAtom = nullptr; + DenseMap<JITTargetAddress, CIEInformation> CIEInfos; + Edge::Kind FDEToCIERelocKind; + Edge::Kind FDEToTargetRelocKind; +}; + +Error addEHFrame(AtomGraph &G, Section &EHFrameSection, + StringRef EHFrameContent, JITTargetAddress EHFrameAddress, + Edge::Kind FDEToCIERelocKind, Edge::Kind FDEToTargetRelocKind); + +} // end namespace jitlink +} // end namespace llvm + +#endif // LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H |
