//===-- llvm/CodeGen/MachineCodeEmitter.h - Code emission -------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// 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
+// be separated 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
+#ifndef LLVM_CODEGEN_MACHINECODEEMITTER_H
+#define LLVM_CODEGEN_MACHINECODEEMITTER_H
+
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
-class MachineFunction;
class MachineBasicBlock;
+class MachineConstantPool;
+class MachineFunction;
+class MachineRelocation;
+class Value;
+class GlobalValue;
+class Function;
-struct MachineCodeEmitter {
+class MachineCodeEmitter {
+public:
+ virtual ~MachineCodeEmitter() {}
/// startFunction - This callback is invoked when the specified function is
/// about to be code generated.
///
virtual void finishFunction(MachineFunction &F) {}
- /// startBasicBlock - This callback is invoked when a new basic block is about
- /// to be emitted.
+ /// emitConstantPool - This callback is invoked to output the constant pool
+ /// for the function.
+ virtual void emitConstantPool(MachineConstantPool *MCP) {}
+
+ /// 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 startBasicBlock(MachineBasicBlock &BB) {}
+ virtual void startFunctionStub(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) {}
+
+ /// emitWordAt - This callback is invoked when a word needs to be written to
+ /// the output stream at a different position than the current PC (for
+ /// instance, when performing relocations).
+ ///
+ virtual void emitWordAt(unsigned W, unsigned *Ptr) {}
+
+ /// emitWord - This callback is invoked when a word needs to be written to the
+ /// output stream.
+ ///
+ virtual void emitWord(unsigned W) = 0;
+
+ /// getCurrentPCValue - This returns the address that the next emitted byte
+ /// will be output to.
+ ///
+ virtual uint64_t getCurrentPCValue() = 0;
+
+
+ /// getCurrentPCOffset - Return the offset from the start of the emitted
+ /// buffer that we are currently writing to.
+ virtual uint64_t getCurrentPCOffset() = 0;
+
+ /// addRelocation - Whenever a relocatable address is needed, it should be
+ /// noted with this interface.
+ virtual void addRelocation(const MachineRelocation &MR) = 0;
+
+ // getConstantPoolEntryAddress - Return the address of the 'Index' entry in
+ // the constant pool that was last emitted with the 'emitConstantPool' method.
+ //
+ virtual uint64_t getConstantPoolEntryAddress(unsigned Index) = 0;
+
+ /// createDebugEmitter - 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 *createDebugEmitter();
+
+ /// createFilePrinterEmitter - 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 *createFilePrinterEmitter(MachineCodeEmitter&);
};
+} // End llvm namespace
+
#endif