1 //===-- llvm/MC/MCCodeEmitter.h - Instruction Encoding ----------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_MC_MCCODEEMITTER_H
11 #define LLVM_MC_MCCODEEMITTER_H
13 #include "llvm/MC/MCFixup.h"
21 template<typename T> class SmallVectorImpl;
23 /// MCFixupKindInfo - Target independent information on a fixup kind.
24 struct MCFixupKindInfo {
25 /// A target specific name for the fixup kind. The names will be unique for
26 /// distinct kinds on any given target.
29 /// The bit offset to write the relocation into.
31 // FIXME: These two fields are under-specified and not general enough, but it
32 // is covers many things, and is enough to let the AsmStreamer pretty-print
34 unsigned TargetOffset;
36 /// The number of bits written by this fixup. The bits are assumed to be
41 /// MCCodeEmitter - Generic instruction encoding interface.
44 MCCodeEmitter(const MCCodeEmitter &); // DO NOT IMPLEMENT
45 void operator=(const MCCodeEmitter &); // DO NOT IMPLEMENT
46 protected: // Can only create subclasses.
50 virtual ~MCCodeEmitter();
52 /// @name Target Independent Fixup Information
55 /// getNumFixupKinds - Get the number of target specific fixup kinds.
56 virtual unsigned getNumFixupKinds() const = 0;
58 /// getFixupKindInfo - Get information on a fixup kind.
59 virtual const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const;
63 /// EncodeInstruction - Encode the given \arg Inst to bytes on the output
65 virtual void EncodeInstruction(const MCInst &Inst, raw_ostream &OS,
66 SmallVectorImpl<MCFixup> &Fixups) const = 0;
69 } // End llvm namespace