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//===- Target/TargetJITInfo.h - Target Information for JIT ------*- 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 exposes an abstract interface used by the Just-In-Time code
// generator to perform target-specific activities, such as emitting stubs. If
// a TargetMachine supports JIT code generation, it should provide one of these
// objects through the getJITInfo() method.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETJITINFO_H
#define LLVM_TARGET_TARGETJITINFO_H
namespace llvm {
class Function;
class FunctionPassManager;
class MachineCodeEmitter;
/// TargetJITInfo - Target specific information required by the Just-In-Time
/// code generator.
struct TargetJITInfo {
virtual ~TargetJITInfo() {}
/// addPassesToJITCompile - Add passes to the specified pass manager to
/// implement a fast code generator for this target.
///
virtual void addPassesToJITCompile(FunctionPassManager &PM) = 0;
/// replaceMachineCodeForFunction - Make it so that calling the function
/// whose machine code is at OLD turns into a call to NEW, perhaps by
/// overwriting OLD with a branch to NEW. This is used for self-modifying
/// code.
///
virtual void replaceMachineCodeForFunction (void *Old, void *New) = 0;
/// getJITStubForFunction - Create or return a stub for the specified
/// function. This stub acts just like the specified function, except that
/// it allows the "address" of the function to be taken without having to
/// generate code for it. Targets do not need to implement this method, but
/// doing so will allow for faster startup of the JIT.
///
virtual void *getJITStubForFunction(Function *F, MachineCodeEmitter &MCE) {
return 0;
}
};
} // End llvm namespace
#endif
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