1 //===-- X86JITInfo.h - X86 implementation of the JIT interface --*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains the X86 implementation of the TargetJITInfo class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef X86JITINFO_H 15 #define X86JITINFO_H 16 17 #include "llvm/Function.h" 18 #include "llvm/CodeGen/JITCodeEmitter.h" 19 #include "llvm/Target/TargetJITInfo.h" 20 21 namespace llvm { 22 class X86TargetMachine; 23 class X86Subtarget; 24 25 class X86JITInfo : public TargetJITInfo { 26 X86TargetMachine &TM; 27 const X86Subtarget *Subtarget; 28 uintptr_t PICBase; 29 char* TLSOffset; 30 public: 31 explicit X86JITInfo(X86TargetMachine &tm); 32 33 /// replaceMachineCodeForFunction - Make it so that calling the function 34 /// whose machine code is at OLD turns into a call to NEW, perhaps by 35 /// overwriting OLD with a branch to NEW. This is used for self-modifying 36 /// code. 37 /// 38 virtual void replaceMachineCodeForFunction(void *Old, void *New); 39 40 /// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object 41 /// to emit an indirect symbol which contains the address of the specified 42 /// ptr. 43 virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr, 44 JITCodeEmitter &JCE); 45 46 // getStubLayout - Returns the size and alignment of the largest call stub 47 // on X86. 48 virtual StubLayout getStubLayout(); 49 50 /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a 51 /// small native function that simply calls the function at the specified 52 /// address. 53 virtual void *emitFunctionStub(const Function* F, void *Target, 54 JITCodeEmitter &JCE); 55 56 /// getPICJumpTableEntry - Returns the value of the jumptable entry for the 57 /// specific basic block. 58 virtual uintptr_t getPICJumpTableEntry(uintptr_t BB, uintptr_t JTBase); 59 60 /// getLazyResolverFunction - Expose the lazy resolver to the JIT. 61 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn); 62 63 /// relocate - Before the JIT can run a block of code that has been emitted, 64 /// it must rewrite the code to contain the actual addresses of any 65 /// referenced global symbols. 66 virtual void relocate(void *Function, MachineRelocation *MR, 67 unsigned NumRelocs, unsigned char* GOTBase); 68 69 /// allocateThreadLocalMemory - Each target has its own way of 70 /// handling thread local variables. This method returns a value only 71 /// meaningful to the target. 72 virtual char* allocateThreadLocalMemory(size_t size); 73 74 /// setPICBase / getPICBase - Getter / setter of PICBase, used to compute 75 /// PIC jumptable entry. 76 void setPICBase(uintptr_t Base) { PICBase = Base; } 77 uintptr_t getPICBase() const { return PICBase; } 78 }; 79 } 80 81 #endif 82
