123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
//===------- EHFrameSupportImpl.h - JITLink eh-frame utils ------*- 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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// EHFrame registration support for JITLink.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
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#define LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
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#include "llvm/ExecutionEngine/JITLink/EHFrameSupport.h"
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#include "llvm/ExecutionEngine/JITLink/JITLink.h"
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#include "llvm/Support/BinaryStreamReader.h"
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namespace llvm {
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namespace jitlink {
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/// A LinkGraph pass that splits blocks in an eh-frame section into sub-blocks
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/// representing individual eh-frames.
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/// EHFrameSplitter should not be run without EHFrameEdgeFixer, which is
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/// responsible for adding FDE-to-CIE edges.
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class EHFrameSplitter {
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public:
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EHFrameSplitter(StringRef EHFrameSectionName);
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Error operator()(LinkGraph &G);
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private:
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Error processBlock(LinkGraph &G, Block &B, LinkGraph::SplitBlockCache &Cache);
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StringRef EHFrameSectionName;
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};
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/// A LinkGraph pass that adds missing FDE-to-CIE, FDE-to-PC and FDE-to-LSDA
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/// edges.
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class EHFrameEdgeFixer {
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public:
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EHFrameEdgeFixer(StringRef EHFrameSectionName, unsigned PointerSize,
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Edge::Kind Delta64, Edge::Kind Delta32,
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Edge::Kind NegDelta32);
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Error operator()(LinkGraph &G);
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private:
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struct AugmentationInfo {
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bool AugmentationDataPresent = false;
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bool EHDataFieldPresent = false;
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uint8_t Fields[4] = {0x0, 0x0, 0x0, 0x0};
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};
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struct CIEInformation {
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CIEInformation() = default;
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CIEInformation(Symbol &CIESymbol) : CIESymbol(&CIESymbol) {}
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Symbol *CIESymbol = nullptr;
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bool FDEsHaveLSDAField = false;
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uint8_t FDEPointerEncoding = 0;
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uint8_t LSDAPointerEncoding = 0;
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};
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struct EdgeTarget {
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EdgeTarget() = default;
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EdgeTarget(const Edge &E) : Target(&E.getTarget()), Addend(E.getAddend()) {}
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Symbol *Target = nullptr;
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Edge::AddendT Addend = 0;
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};
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using BlockEdgeMap = DenseMap<Edge::OffsetT, EdgeTarget>;
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using CIEInfosMap = DenseMap<JITTargetAddress, CIEInformation>;
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struct ParseContext {
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ParseContext(LinkGraph &G) : G(G) {}
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Expected<CIEInformation *> findCIEInfo(JITTargetAddress Address) {
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auto I = CIEInfos.find(Address);
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if (I == CIEInfos.end())
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return make_error<JITLinkError>("No CIE found at address " +
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formatv("{0:x16}", Address));
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return &I->second;
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}
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LinkGraph &G;
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CIEInfosMap CIEInfos;
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BlockAddressMap AddrToBlock;
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SymbolAddressMap AddrToSyms;
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};
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Error processBlock(ParseContext &PC, Block &B);
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Error processCIE(ParseContext &PC, Block &B, size_t RecordOffset,
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size_t RecordLength, size_t CIEDeltaFieldOffset);
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Error processFDE(ParseContext &PC, Block &B, size_t RecordOffset,
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size_t RecordLength, size_t CIEDeltaFieldOffset,
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uint32_t CIEDelta, BlockEdgeMap &BlockEdges);
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Expected<AugmentationInfo>
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parseAugmentationString(BinaryStreamReader &RecordReader);
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static bool isSupportedPointerEncoding(uint8_t PointerEncoding);
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unsigned getPointerEncodingDataSize(uint8_t PointerEncoding);
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Expected<std::pair<JITTargetAddress, Edge::Kind>>
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readEncodedPointer(uint8_t PointerEncoding,
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JITTargetAddress PointerFieldAddress,
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BinaryStreamReader &RecordReader);
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Expected<Symbol &> getOrCreateSymbol(ParseContext &PC, JITTargetAddress Addr);
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StringRef EHFrameSectionName;
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unsigned PointerSize;
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Edge::Kind Delta64;
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Edge::Kind Delta32;
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Edge::Kind NegDelta32;
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};
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} // end namespace jitlink
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} // end namespace llvm
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#endif // LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
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