1 //===- X86JITInfo.h - X86 implementation of the JIT interface --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the X86 implementation of the TargetJITInfo class.
12 //===----------------------------------------------------------------------===//
17 #include "llvm/Function.h"
18 #include "llvm/Target/TargetJITInfo.h"
21 class X86TargetMachine;
23 class X86JITInfo : public TargetJITInfo {
27 explicit X86JITInfo(X86TargetMachine &tm) : TM(tm) {useGOT = 0;}
29 /// replaceMachineCodeForFunction - Make it so that calling the function
30 /// whose machine code is at OLD turns into a call to NEW, perhaps by
31 /// overwriting OLD with a branch to NEW. This is used for self-modifying
34 virtual void replaceMachineCodeForFunction(void *Old, void *New);
36 /// emitGlobalValueLazyPtr - Use the specified MachineCodeEmitter object to
37 /// emit a lazy pointer which contains the address of the specified ptr.
38 virtual void *emitGlobalValueLazyPtr(const GlobalValue* GV, void *ptr,
39 MachineCodeEmitter &MCE);
41 /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
42 /// small native function that simply calls the function at the specified
44 virtual void *emitFunctionStub(const Function* F, void *Fn,
45 MachineCodeEmitter &MCE);
47 /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
48 /// specific basic block.
49 virtual intptr_t getPICJumpTableEntry(intptr_t BB, intptr_t JTBase);
51 /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
52 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
54 /// relocate - Before the JIT can run a block of code that has been emitted,
55 /// it must rewrite the code to contain the actual addresses of any
56 /// referenced global symbols.
57 virtual void relocate(void *Function, MachineRelocation *MR,
58 unsigned NumRelocs, unsigned char* GOTBase);
60 /// setPICBase / getPICBase - Getter / setter of PICBase, used to compute
61 /// PIC jumptable entry.
62 void setPICBase(intptr_t Base) { PICBase = Base; }
63 intptr_t getPICBase() const { return PICBase; }