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   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