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/Target/TargetJITInfo.h"
20 class X86TargetMachine;
22 class X86JITInfo : public TargetJITInfo {
26 X86JITInfo(X86TargetMachine &tm) : TM(tm) {useGOT = 0;}
28 /// replaceMachineCodeForFunction - Make it so that calling the function
29 /// whose machine code is at OLD turns into a call to NEW, perhaps by
30 /// overwriting OLD with a branch to NEW. This is used for self-modifying
33 virtual void replaceMachineCodeForFunction(void *Old, void *New);
35 /// emitGlobalValueLazyPtr - Use the specified MachineCodeEmitter object to
36 /// emit a lazy pointer which contains the address of the specified GV.
37 virtual void *emitGlobalValueLazyPtr(void *GV, MachineCodeEmitter &MCE);
39 /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
40 /// small native function that simply calls the function at the specified
42 virtual void *emitFunctionStub(void *Fn, MachineCodeEmitter &MCE);
44 /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
45 /// specific basic block.
46 virtual intptr_t getPICJumpTableEntry(intptr_t BB, intptr_t JTBase);
48 /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
49 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
51 /// relocate - Before the JIT can run a block of code that has been emitted,
52 /// it must rewrite the code to contain the actual addresses of any
53 /// referenced global symbols.
54 virtual void relocate(void *Function, MachineRelocation *MR,
55 unsigned NumRelocs, unsigned char* GOTBase);
57 /// setPICBase / getPICBase - Getter / setter of PICBase, used to compute
58 /// PIC jumptable entry.
59 void setPICBase(intptr_t Base) { PICBase = Base; }
60 intptr_t getPICBase() const { return PICBase; }