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//===- SFrameParser.h -------------------------------------------*- 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_SFRAME_H
#define LLVM_OBJECT_SFRAME_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/fallible_iterator.h"
#include "llvm/BinaryFormat/SFrame.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Error.h"
#include <cstdint>
namespace llvm {
namespace object {
template <endianness E> class SFrameParser {
class FallibleFREIterator;
public:
static Expected<SFrameParser> create(ArrayRef<uint8_t> Contents,
uint64_t SectionAddress);
const sframe::Preamble<E> &getPreamble() const { return Header.Preamble; }
const sframe::Header<E> &getHeader() const { return Header; }
Expected<ArrayRef<uint8_t>> getAuxHeader() const;
bool usesFixedRAOffset() const {
return getHeader().ABIArch == sframe::ABI::AMD64EndianLittle;
}
bool usesFixedFPOffset() const {
return false; // Not used in any currently defined ABI.
}
using FDERange = ArrayRef<sframe::FuncDescEntry<E>>;
Expected<FDERange> fdes() const;
// Decodes the start address of the given FDE, which must be one of the
// objects returned by the `fdes()` function.
uint64_t getAbsoluteStartAddress(typename FDERange::iterator FDE) const;
// Returns the offset (in the SFrame section) of the given FDE, which must be
// one of the objects returned by the `fdes()` function.
uint64_t offsetOf(typename FDERange::iterator FDE) const;
struct FrameRowEntry {
uint32_t StartAddress;
sframe::FREInfo<endianness::native> Info;
SmallVector<int32_t, 3> Offsets;
};
using fre_iterator = fallible_iterator<FallibleFREIterator>;
iterator_range<fre_iterator> fres(const sframe::FuncDescEntry<E> &FDE,
Error &Err) const;
std::optional<int32_t> getCFAOffset(const FrameRowEntry &FRE) const;
std::optional<int32_t> getRAOffset(const FrameRowEntry &FRE) const;
std::optional<int32_t> getFPOffset(const FrameRowEntry &FRE) const;
ArrayRef<int32_t> getExtraOffsets(const FrameRowEntry &FRE) const;
private:
ArrayRef<uint8_t> Data;
uint64_t SectionAddress;
const sframe::Header<E> &Header;
SFrameParser(ArrayRef<uint8_t> Data, uint64_t SectionAddress,
const sframe::Header<E> &Header)
: Data(Data), SectionAddress(SectionAddress), Header(Header) {}
uint64_t getFDEBase() const {
return sizeof(Header) + Header.AuxHdrLen + Header.FDEOff;
}
uint64_t getFREBase() const {
return getFDEBase() + Header.NumFDEs * sizeof(sframe::FuncDescEntry<E>);
}
};
template <endianness E> class SFrameParser<E>::FallibleFREIterator {
public:
// NB: This iterator starts out in the before_begin() state. It must be
// ++'ed to reach the first element.
FallibleFREIterator(ArrayRef<uint8_t> Data, sframe::FREType FREType,
uint32_t Idx, uint32_t Size, uint64_t Offset)
: Data(Data), FREType(FREType), Idx(Idx), Size(Size), Offset(Offset) {}
LLVM_ABI Error inc();
const FrameRowEntry &operator*() const { return FRE; }
friend bool operator==(const FallibleFREIterator &LHS,
const FallibleFREIterator &RHS) {
assert(LHS.Data.data() == RHS.Data.data());
assert(LHS.Data.size() == RHS.Data.size());
assert(LHS.FREType == RHS.FREType);
assert(LHS.Size == RHS.Size);
return LHS.Idx == RHS.Idx;
}
private:
ArrayRef<uint8_t> Data;
sframe::FREType FREType;
uint32_t Idx;
uint32_t Size;
uint64_t Offset;
FrameRowEntry FRE;
};
extern template class LLVM_TEMPLATE_ABI SFrameParser<endianness::big>;
extern template class LLVM_TEMPLATE_ABI SFrameParser<endianness::little>;
} // end namespace object
} // end namespace llvm
#endif // LLVM_OBJECT_SFRAME_H
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