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/CodeGen/JITCodeEmitter.h"
  19 #include "llvm/Target/TargetJITInfo.h"
  20
  21 namespace llvm {
  22   class X86TargetMachine;
  23
  24   class X86JITInfo : public TargetJITInfo {
  25     X86TargetMachine &TM;
  26     uintptr_t PICBase;
  27     char* TLSOffset;
  28   public:
  29     explicit X86JITInfo(X86TargetMachine &tm) : TM(tm) {
  30       useGOT = 0;
  31       TLSOffset = 0;
  32     }
  33
  34     /// replaceMachineCodeForFunction - Make it so that calling the function
  35     /// whose machine code is at OLD turns into a call to NEW, perhaps by
  36     /// overwriting OLD with a branch to NEW.  This is used for self-modifying
  37     /// code.
  38     ///
  39     virtual void replaceMachineCodeForFunction(void *Old, void *New);
  40
  41     /// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
  42     /// to emit an indirect symbol which contains the address of the specified
  43     /// ptr.
  44     virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
  45                                              JITCodeEmitter &JCE);
  46
  47     /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
  48     /// small native function that simply calls the function at the specified
  49     /// address.
  50     virtual void *emitFunctionStub(const Function* F, void *Fn,
  51                                    JITCodeEmitter &JCE);
  52
  53     /// emitFunctionStubAtAddr - Use the specified JITCodeEmitter object to
  54     /// emit a small native function that simply calls Fn. Emit the stub into
  55     /// the supplied buffer.
  56     virtual void emitFunctionStubAtAddr(const Function* F, void *Fn,
  57                                         void *Buffer, JITCodeEmitter &JCE);
  58
  59     /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
  60     /// specific basic block.
  61     virtual uintptr_t getPICJumpTableEntry(uintptr_t BB, uintptr_t JTBase);
  62
  63     /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
  64     virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
  65
  66     /// relocate - Before the JIT can run a block of code that has been emitted,
  67     /// it must rewrite the code to contain the actual addresses of any
  68     /// referenced global symbols.
  69     virtual void relocate(void *Function, MachineRelocation *MR,
  70                           unsigned NumRelocs, unsigned char* GOTBase);
  71
  72     /// allocateThreadLocalMemory - Each target has its own way of
  73     /// handling thread local variables. This method returns a value only
  74     /// meaningful to the target.
  75     virtual char* allocateThreadLocalMemory(size_t size);
  76
  77     /// setPICBase / getPICBase - Getter / setter of PICBase, used to compute
  78     /// PIC jumptable entry.
  79     void setPICBase(uintptr_t Base) { PICBase = Base; }
  80     uintptr_t getPICBase() const { return PICBase; }
  81   };
  82 }
  83
  84 #endif