1 //===-- llvm/CodeGen/MachineCodeEmitter.h - Code emission -------*- C++ -*-===//
3 // This file defines an abstract interface that is used by the machine code
4 // emission framework to output the code. This allows machine code emission to
5 // be seperated from concerns such as resolution of call targets, and where the
6 // machine code will be written (memory or disk, f.e.).
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_CODEGEN_MACHINE_CODE_EMITTER_H
11 #define LLVM_CODEGEN_MACHINE_CODE_EMITTER_H
13 class MachineFunction;
14 class MachineBasicBlock;
17 struct MachineCodeEmitter {
19 /// startFunction - This callback is invoked when the specified function is
20 /// about to be code generated.
22 virtual void startFunction(MachineFunction &F) {}
24 /// finishFunction - This callback is invoked when the specified function has
25 /// finished code generation.
27 virtual void finishFunction(MachineFunction &F) {}
29 /// startBasicBlock - This callback is invoked when a new basic block is about
32 virtual void startBasicBlock(MachineBasicBlock &BB) {}
34 /// emitByte - This callback is invoked when a byte needs to be written to the
37 virtual void emitByte(unsigned char B) {}
39 /// emitPCRelativeDisp - This callback is invoked when we need to write out a
40 /// PC relative displacement for the specified Value*. This is used for call
41 /// and jump instructions typically.
43 virtual void emitPCRelativeDisp(Value *V) {}