#ifndef LLVM_MC_MCOBJECTWRITER_H
#define LLVM_MC_MCOBJECTWRITER_H
-#include "llvm/ADT/Triple.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Compiler.h"
#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/EndianStream.h"
+#include "llvm/Support/raw_ostream.h"
#include <cassert>
namespace llvm {
class MCAssembler;
class MCFixup;
class MCFragment;
-class MCSymbol;
+class MCSymbolData;
class MCSymbolRefExpr;
class MCValue;
-class raw_ostream;
/// MCObjectWriter - Defines the object file and target independent interfaces
/// used by the assembler backend to write native file format object files.
/// The object writer also contains a number of helper methods for writing
/// binary data to the output stream.
class MCObjectWriter {
- MCObjectWriter(const MCObjectWriter &); // DO NOT IMPLEMENT
- void operator=(const MCObjectWriter &); // DO NOT IMPLEMENT
+ MCObjectWriter(const MCObjectWriter &) = delete;
+ void operator=(const MCObjectWriter &) = delete;
protected:
- raw_ostream &OS;
+ raw_pwrite_stream &OS;
unsigned IsLittleEndian : 1;
protected: // Can only create subclasses.
- MCObjectWriter(raw_ostream &_OS, bool _IsLittleEndian)
- : OS(_OS), IsLittleEndian(_IsLittleEndian) {}
+ MCObjectWriter(raw_pwrite_stream &OS, bool IsLittleEndian)
+ : OS(OS), IsLittleEndian(IsLittleEndian) {}
public:
virtual ~MCObjectWriter();
+ /// lifetime management
+ virtual void reset() { }
+
bool isLittleEndian() const { return IsLittleEndian; }
raw_ostream &getStream() { return OS; }
/// @name High-Level API
/// @{
- /// Perform any late binding of symbols (for example, to assign symbol indices
- /// for use when generating relocations).
+ /// \brief Perform any late binding of symbols (for example, to assign symbol
+ /// indices for use when generating relocations).
///
/// This routine is called by the assembler after layout and relaxation is
/// complete.
virtual void ExecutePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout) = 0;
- /// Record a relocation entry.
+ /// \brief Record a relocation entry.
///
/// This routine is called by the assembler after layout and relaxation, and
/// post layout binding. The implementation is responsible for storing
/// information about the relocation so that it can be emitted during
/// WriteObject().
- virtual void RecordRelocation(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
+ virtual void RecordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
const MCFragment *Fragment,
const MCFixup &Fixup, MCValue Target,
- uint64_t &FixedValue) = 0;
+ bool &IsPCRel, uint64_t &FixedValue) = 0;
/// \brief Check whether the difference (A - B) between two symbol
/// references is fully resolved.
///
/// Clients are not required to answer precisely and may conservatively return
/// false, even when a difference is fully resolved.
- virtual bool
- IsSymbolRefDifferenceFullyResolved(const MCAssembler &Asm,
- const MCSymbolRefExpr *A,
- const MCSymbolRefExpr *B) const = 0;
-
- /// Check if a fixup is fully resolved.
- ///
- /// This routine is used by the assembler to let the file format decide
- /// if a fixup is not fully resolved. For example, one that crosses
- /// two sections on ELF.
- virtual bool IsFixupFullyResolved(const MCAssembler &Asm,
- const MCValue Target,
- bool IsPCRel,
- const MCFragment *DF) const = 0;
-
- virtual bool isAbsolute(bool IsSet, const MCSymbol &A,
- const MCSymbol &B) const = 0;
-
- /// Write the object file.
+ bool IsSymbolRefDifferenceFullyResolved(const MCAssembler &Asm,
+ const MCSymbolRefExpr *A,
+ const MCSymbolRefExpr *B,
+ bool InSet) const;
+
+ virtual bool IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
+ const MCSymbolData &DataA,
+ const MCSymbolData *DataB,
+ const MCFragment &FB,
+ bool InSet,
+ bool IsPCRel) const;
+
+ /// \brief True if this symbol (which is a variable) is weak. This is not
+ /// just STB_WEAK, but more generally whether or not we can evaluate
+ /// past it.
+ virtual bool isWeak(const MCSymbolData &SD) const;
+
+ /// \brief Write the object file.
///
/// This routine is called by the assembler after layout and relaxation is
/// complete, fixups have been evaluated and applied, and relocations
}
void WriteLE16(uint16_t Value) {
- Write8(uint8_t(Value >> 0));
- Write8(uint8_t(Value >> 8));
+ support::endian::Writer<support::little>(OS).write(Value);
}
void WriteLE32(uint32_t Value) {
- WriteLE16(uint16_t(Value >> 0));
- WriteLE16(uint16_t(Value >> 16));
+ support::endian::Writer<support::little>(OS).write(Value);
}
void WriteLE64(uint64_t Value) {
- WriteLE32(uint32_t(Value >> 0));
- WriteLE32(uint32_t(Value >> 32));
+ support::endian::Writer<support::little>(OS).write(Value);
}
void WriteBE16(uint16_t Value) {
- Write8(uint8_t(Value >> 8));
- Write8(uint8_t(Value >> 0));
+ support::endian::Writer<support::big>(OS).write(Value);
}
void WriteBE32(uint32_t Value) {
- WriteBE16(uint16_t(Value >> 16));
- WriteBE16(uint16_t(Value >> 0));
+ support::endian::Writer<support::big>(OS).write(Value);
}
void WriteBE64(uint64_t Value) {
- WriteBE32(uint32_t(Value >> 32));
- WriteBE32(uint32_t(Value >> 0));
+ support::endian::Writer<support::big>(OS).write(Value);
}
void Write16(uint16_t Value) {
OS << StringRef(Zeros, N % 16);
}
+ void WriteBytes(const SmallVectorImpl<char> &ByteVec, unsigned ZeroFillSize = 0) {
+ WriteBytes(StringRef(ByteVec.data(), ByteVec.size()), ZeroFillSize);
+ }
+
void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) {
+ // TODO: this version may need to go away once all fragment contents are
+ // converted to SmallVector<char, N>
assert((ZeroFillSize == 0 || Str.size () <= ZeroFillSize) &&
"data size greater than fill size, unexpected large write will occur");
OS << Str;
/// @}
- /// Utility function to encode a SLEB128 value.
- static void EncodeSLEB128(int64_t Value, raw_ostream &OS);
- /// Utility function to encode a ULEB128 value.
- static void EncodeULEB128(uint64_t Value, raw_ostream &OS);
};
-MCObjectWriter *createWinCOFFObjectWriter(raw_ostream &OS, bool is64Bit);
-
} // End llvm namespace
#endif
projects / oota-llvm.git / blobdiff