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+//===------- 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