lib/Target/X86/X86JITInfo.h

   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/Target/TargetJITInfo.h"
  19
  20 namespace llvm {
  21   class X86TargetMachine;
  22
  23   class X86JITInfo : public TargetJITInfo {
  24     X86TargetMachine &TM;
  25     uintptr_t PICBase;
  26     char* TLSOffset;
  27   public:
  28     explicit X86JITInfo(X86TargetMachine &tm) : TM(tm) {
  29       useGOT = 0;
  30       TLSOffset = 0;
  31     }
  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 MachineCodeEmitter 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                                              MachineCodeEmitter &MCE);
  45
  46     /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
  47     /// small native function that simply calls the function at the specified
  48     /// address.
  49     virtual void *emitFunctionStub(const Function* F, void *Fn,
  50                                    MachineCodeEmitter &MCE);
  51
  52     /// emitFunctionStubAtAddr - Use the specified MachineCodeEmitter object to
  53     /// emit a small native function that simply calls Fn. Emit the stub into
  54     /// the supplied buffer.
  55     virtual void emitFunctionStubAtAddr(const Function* F, void *Fn,
  56                                         void *Buffer, MachineCodeEmitter &MCE);
  57
  58     /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
  59     /// specific basic block.
  60     virtual uintptr_t getPICJumpTableEntry(uintptr_t BB, uintptr_t JTBase);
  61
  62     /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
  63     virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
  64
  65     /// relocate - Before the JIT can run a block of code that has been emitted,
  66     /// it must rewrite the code to contain the actual addresses of any
  67     /// referenced global symbols.
  68     virtual void relocate(void *Function, MachineRelocation *MR,
  69                           unsigned NumRelocs, unsigned char* GOTBase);
  70
  71     /// allocateThreadLocalMemory - Each target has its own way of
  72     /// handling thread local variables. This method returns a value only
  73     /// meaningful to the target.
  74     virtual char* allocateThreadLocalMemory(size_t size);
  75
  76     /// setPICBase / getPICBase - Getter / setter of PICBase, used to compute
  77     /// PIC jumptable entry.
  78     void setPICBase(uintptr_t Base) { PICBase = Base; }
  79     uintptr_t getPICBase() const { return PICBase; }
  80   };
  81 }
  82
  83 #endif