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81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
//===-- llvm/MC/MCCodeEmitter.h - Instruction Encoding ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCCODEEMITTER_H
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#define LLVM_MC_MCCODEEMITTER_H
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#include "llvm/MC/MCFixup.h"
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#include <cassert>
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namespace llvm {
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class MCExpr;
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class MCInst;
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class raw_ostream;
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template<typename T> class SmallVectorImpl;
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/// MCFixupKindInfo - Target independent information on a fixup kind.
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struct MCFixupKindInfo {
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enum FixupKindFlags {
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/// Is this fixup kind PCrelative. This is used by the assembler backend to
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/// evaluate fixup values in a target independent manner when possible.
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FKF_IsPCRel = (1 << 0)
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};
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/// A target specific name for the fixup kind. The names will be unique for
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/// distinct kinds on any given target.
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const char *Name;
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/// The bit offset to write the relocation into.
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//
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// FIXME: These two fields are under-specified and not general enough, but it
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// is covers many things, and is enough to let the AsmStreamer pretty-print
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// the encoding.
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unsigned TargetOffset;
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/// The number of bits written by this fixup. The bits are assumed to be
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/// contiguous.
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unsigned TargetSize;
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/// Flags describing additional information on this fixup kind.
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unsigned Flags;
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};
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/// MCCodeEmitter - Generic instruction encoding interface.
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class MCCodeEmitter {
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private:
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MCCodeEmitter(const MCCodeEmitter &); // DO NOT IMPLEMENT
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void operator=(const MCCodeEmitter &); // DO NOT IMPLEMENT
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protected: // Can only create subclasses.
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MCCodeEmitter();
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public:
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virtual ~MCCodeEmitter();
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/// @name Target Independent Fixup Information
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/// @{
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/// getNumFixupKinds - Get the number of target specific fixup kinds.
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virtual unsigned getNumFixupKinds() const = 0;
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/// getFixupKindInfo - Get information on a fixup kind.
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virtual const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const;
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/// @}
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/// EncodeInstruction - Encode the given \arg Inst to bytes on the output
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/// stream \arg OS.
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virtual void EncodeInstruction(const MCInst &Inst, raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups) const = 0;
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};
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} // End llvm namespace
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#endif
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