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fd1bb8b974
emitters can use to emit "relocations". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13116 91177308-0d34-0410-b5e6-96231b3b80d8
120 lines
4.4 KiB
C++
120 lines
4.4 KiB
C++
//===-- llvm/CodeGen/MachineCodeEmitter.h - Code emission -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an abstract interface that is used by the machine code
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// emission framework to output the code. This allows machine code emission to
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// be separated from concerns such as resolution of call targets, and where the
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// machine code will be written (memory or disk, f.e.).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINECODEEMITTER_H
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#define LLVM_CODEGEN_MACHINECODEEMITTER_H
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#include <string>
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#include "Support/DataTypes.h"
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namespace llvm {
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class MachineFunction;
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class MachineBasicBlock;
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class MachineConstantPool;
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class Value;
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class GlobalValue;
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class Function;
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struct MachineCodeEmitter {
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virtual ~MachineCodeEmitter() {}
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/// startFunction - This callback is invoked when the specified function is
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/// about to be code generated.
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///
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virtual void startFunction(MachineFunction &F) {}
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/// finishFunction - This callback is invoked when the specified function has
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/// finished code generation.
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///
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virtual void finishFunction(MachineFunction &F) {}
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/// emitConstantPool - This callback is invoked to output the constant pool
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/// for the function.
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virtual void emitConstantPool(MachineConstantPool *MCP) {}
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/// startFunctionStub - This callback is invoked when the JIT needs the
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/// address of a function that has not been code generated yet. The StubSize
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/// specifies the total size required by the stub. Stubs are not allowed to
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/// have constant pools, the can only use the other emit* methods.
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///
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virtual void startFunctionStub(const Function &F, unsigned StubSize) {}
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/// finishFunctionStub - This callback is invoked to terminate a function
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/// stub.
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///
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virtual void *finishFunctionStub(const Function &F) { return 0; }
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/// emitByte - This callback is invoked when a byte needs to be written to the
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/// output stream.
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///
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virtual void emitByte(unsigned char B) {}
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/// emitWordAt - This callback is invoked when a word needs to be written to
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/// the output stream at a different position than the current PC (for
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/// instance, when performing relocations).
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///
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virtual void emitWordAt(unsigned W, unsigned *Ptr) {}
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/// emitWord - This callback is invoked when a word needs to be written to the
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/// output stream.
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///
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virtual void emitWord(unsigned W) = 0;
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/// getGlobalValueAddress - This method is used to get the address of the
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/// specified global value. In some cases, however, the address may not yet
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/// be known at the point that the method is called (for example, getting the
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/// address of a function which has not yet been code generated). If this is
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/// the case, the function returns zero, and the callee has to be able to
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/// handle the situation.
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///
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virtual uint64_t getGlobalValueAddress(GlobalValue *V) = 0;
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virtual uint64_t getGlobalValueAddress(const std::string &Name) = 0;
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// getConstantPoolEntryAddress - Return the address of the 'Index' entry in
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// the constant pool that was last emitted with the 'emitConstantPool' method.
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//
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virtual uint64_t getConstantPoolEntryAddress(unsigned Index) = 0;
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// getCurrentPCValue - This returns the address that the next emitted byte
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// will be output to.
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//
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virtual uint64_t getCurrentPCValue() = 0;
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// forceCompilationOf - Force the compilation of the specified function, and
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// return its address, because we REALLY need the address now.
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//
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// FIXME: This is JIT specific!
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//
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virtual uint64_t forceCompilationOf(Function *F) = 0;
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/// createDebugEmitter - Return a dynamically allocated machine
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/// code emitter, which just prints the opcodes and fields out the cout. This
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/// can be used for debugging users of the MachineCodeEmitter interface.
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///
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static MachineCodeEmitter *createDebugEmitter();
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/// createFilePrinterEmitter - Return a dynamically allocated
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/// machine code emitter, which prints binary code to a file. This
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/// can be used for debugging users of the MachineCodeEmitter interface.
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///
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static MachineCodeEmitter *createFilePrinterEmitter(MachineCodeEmitter&);
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};
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} // End llvm namespace
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#endif
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