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//===-- llvm/CodeGen/MachineCodeEmitter.h - Code emission -------*- C++ -*-===//
//
// This file defines an abstract interface that is used by the machine code
// emission framework to output the code. This allows machine code emission to
// be seperated from concerns such as resolution of call targets, and where the
// machine code will be written (memory or disk, f.e.).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINE_CODE_EMITTER_H
#define LLVM_CODEGEN_MACHINE_CODE_EMITTER_H
#include <iostream>
#include <string>
class BasicBlock;
class MachineInstr;
class MachineFunction;
class MachineBasicBlock;
class MachineConstantPool;
class Value;
class GlobalValue;
class Function;
struct MachineCodeEmitter {
virtual ~MachineCodeEmitter() {}
/// startFunction - This callback is invoked when the specified function is
/// about to be code generated.
///
virtual void startFunction(MachineFunction &F) {}
/// finishFunction - This callback is invoked when the specified function has
/// finished code generation.
///
virtual void finishFunction(MachineFunction &F) {}
/// emitConstantPool - This callback is invoked to output the constant pool
/// for the function.
virtual void emitConstantPool(MachineConstantPool *MCP) {}
/// startBasicBlock - This callback is invoked when a new basic block is about
/// to be emitted.
///
virtual void startBasicBlock(MachineBasicBlock &BB) {}
/// startFunctionStub - This callback is invoked when the JIT needs the
/// address of a function that has not been code generated yet. The StubSize
/// specifies the total size required by the stub. Stubs are not allowed to
/// have constant pools, the can only use the other emit* methods.
///
virtual void startFunctionStub(const Function &F, unsigned StubSize) {}
/// finishFunctionStub - This callback is invoked to terminate a function
/// stub.
///
virtual void *finishFunctionStub(const Function &F) { return 0; }
/// emitByte - This callback is invoked when a byte needs to be written to the
/// output stream.
///
virtual void emitByte(unsigned char B) {}
/// emitPCRelativeDisp - This callback is invoked when we need to write out a
/// PC relative displacement for the specified Value*. This is used for call
/// and jump instructions typically.
///
virtual void emitPCRelativeDisp(Value *V) {}
/// emitGlobalAddress - This callback is invoked when we need to write out the
/// address of a global value to machine code. This is important for indirect
/// calls as well as accessing global variables.
///
virtual void emitGlobalAddress(GlobalValue *V, bool isPCRelative) {}
virtual void emitGlobalAddress(const std::string &Name, bool isPCRelative) {}
/// emitFunctionConstantValueAddress - This callback is invoked when the
/// address of a constant, which was spilled to memory, needs to be addressed.
/// This is used for constants which cannot be directly specified as operands
/// to instructions, such as large integer values on the sparc, or floating
/// point constants on the X86.
///
virtual void emitFunctionConstantValueAddress(unsigned ConstantNum,
int Offset) {}
/// createDebugMachineCodeEmitter - Return a dynamically allocated machine
/// code emitter, which just prints the opcodes and fields out the cout. This
/// can be used for debugging users of the MachineCodeEmitter interface.
///
static MachineCodeEmitter *createDebugMachineCodeEmitter();
/// createFilePrinterMachineCodeEmitter - Return a dynamically allocated
/// machine code emitter, which prints binary code to a file. This
/// can be used for debugging users of the MachineCodeEmitter interface.
///
static MachineCodeEmitter*
createFilePrinterMachineCodeEmitter(MachineCodeEmitter&);
///
virtual void saveBBreference(BasicBlock* BB, MachineInstr &MI) {
std::cerr << "Save BB reference unimplemented\n";
}
};
#endif
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