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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 LinkGraph pass that adds missing FDE-to-CIE, FDE-to-PC and FDE-to-LSDA
/// edges.
class EHFrameEdgeFixer {
public:
/// Create an eh-frame edge fixer.
/// Adds edges for implicit relocations on platforms where these are used
/// (e.g. MachO/x86-64).
///
/// If a given edge-kind is not supported on the target architecture then
/// Edge::Invalid should be used.
EHFrameEdgeFixer(StringRef EHFrameSectionName, unsigned PointerSize,
Edge::Kind Pointer32, Edge::Kind Pointer64,
Edge::Kind Delta32, Edge::Kind Delta64,
Edge::Kind NegDelta32);
Error operator()(LinkGraph &G);
private:
struct AugmentationInfo {
bool AugmentationDataPresent = false;
bool EHDataFieldPresent = false;
uint8_t Fields[4] = {0x0, 0x0, 0x0, 0x0};
};
struct CIEInformation {
CIEInformation() = default;
CIEInformation(Symbol &CIESymbol) : CIESymbol(&CIESymbol) {}
Symbol *CIESymbol = nullptr;
bool AugmentationDataPresent = false;
bool LSDAPresent = false;
uint8_t LSDAEncoding = 0;
uint8_t AddressEncoding = 0;
};
struct EdgeTarget {
EdgeTarget() = default;
EdgeTarget(const Edge &E) : Target(&E.getTarget()), Addend(E.getAddend()) {}
Symbol *Target = nullptr;
Edge::AddendT Addend = 0;
};
struct BlockEdgesInfo {
DenseMap<Edge::OffsetT, EdgeTarget> TargetMap;
DenseSet<Edge::OffsetT> Multiple;
};
using CIEInfosMap = DenseMap<orc::ExecutorAddr, CIEInformation>;
struct ParseContext {
ParseContext(LinkGraph &G) : G(G) {}
Expected<CIEInformation *> findCIEInfo(orc::ExecutorAddr Address) {
auto I = CIEInfos.find(Address);
if (I == CIEInfos.end())
return make_error<JITLinkError>("No CIE found at address " +
formatv("{0:x16}", Address));
return &I->second;
}
LinkGraph &G;
CIEInfosMap CIEInfos;
BlockAddressMap AddrToBlock;
DenseMap<orc::ExecutorAddr, Symbol *> AddrToSym;
};
Error processBlock(ParseContext &PC, Block &B);
Error processCIE(ParseContext &PC, Block &B, size_t CIEDeltaFieldOffset,
const BlockEdgesInfo &BlockEdges);
Error processFDE(ParseContext &PC, Block &B, size_t CIEDeltaFieldOffset,
uint32_t CIEDelta, const BlockEdgesInfo &BlockEdges);
Expected<AugmentationInfo>
parseAugmentationString(BinaryStreamReader &RecordReader);
Expected<uint8_t> readPointerEncoding(BinaryStreamReader &RecordReader,
Block &InBlock, const char *FieldName);
Error skipEncodedPointer(uint8_t PointerEncoding,
BinaryStreamReader &RecordReader);
Expected<Symbol *> getOrCreateEncodedPointerEdge(
ParseContext &PC, const BlockEdgesInfo &BlockEdges,
uint8_t PointerEncoding, BinaryStreamReader &RecordReader,
Block &BlockToFix, size_t PointerFieldOffset, const char *FieldName);
Expected<Symbol &> getOrCreateSymbol(ParseContext &PC,
orc::ExecutorAddr Addr);
StringRef EHFrameSectionName;
unsigned PointerSize;
Edge::Kind Pointer32;
Edge::Kind Pointer64;
Edge::Kind Delta32;
Edge::Kind Delta64;
Edge::Kind NegDelta32;
};
/// Add a 32-bit null-terminator to the end of the eh-frame section.
class EHFrameNullTerminator {
public:
EHFrameNullTerminator(StringRef EHFrameSectionName);
Error operator()(LinkGraph &G);
private:
static char NullTerminatorBlockContent[];
StringRef EHFrameSectionName;
};
} // end namespace jitlink
} // end namespace llvm
#endif // LLVM_LIB_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORTIMPL_H
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