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//===-- X86JITInfo.h - X86 implementation of the JIT interface --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the X86 implementation of the TargetJITInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef X86JITINFO_H
#define X86JITINFO_H
#include "llvm/CodeGen/JITCodeEmitter.h"
#include "llvm/IR/Function.h"
#include "llvm/Target/TargetJITInfo.h"
namespace llvm {
class X86TargetMachine;
class X86Subtarget;
class X86JITInfo : public TargetJITInfo {
X86TargetMachine &TM;
const X86Subtarget *Subtarget;
uintptr_t PICBase;
char* TLSOffset;
public:
explicit X86JITInfo(X86TargetMachine &tm);
/// 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);
/// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
/// to emit an indirect symbol which contains the address of the specified
/// ptr.
virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
JITCodeEmitter &JCE);
// getStubLayout - Returns the size and alignment of the largest call stub
// on X86.
virtual StubLayout getStubLayout();
/// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
/// small native function that simply calls the function at the specified
/// address.
virtual void *emitFunctionStub(const Function* F, void *Target,
JITCodeEmitter &JCE);
/// getPICJumpTableEntry - Returns the value of the jumptable entry for the
/// specific basic block.
virtual uintptr_t getPICJumpTableEntry(uintptr_t BB, uintptr_t JTBase);
/// getLazyResolverFunction - Expose the lazy resolver to the JIT.
virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
/// relocate - Before the JIT can run a block of code that has been emitted,
/// it must rewrite the code to contain the actual addresses of any
/// referenced global symbols.
virtual void relocate(void *Function, MachineRelocation *MR,
unsigned NumRelocs, unsigned char* GOTBase);
/// allocateThreadLocalMemory - Each target has its own way of
/// handling thread local variables. This method returns a value only
/// meaningful to the target.
virtual char* allocateThreadLocalMemory(size_t size);
/// setPICBase / getPICBase - Getter / setter of PICBase, used to compute
/// PIC jumptable entry.
void setPICBase(uintptr_t Base) { PICBase = Base; }
uintptr_t getPICBase() const { return PICBase; }
};
}
#endif
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