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