lib/Target/Alpha/AlphaJITInfo.h

   1 //===- AlphaJITInfo.h - Alpha impl. 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 Alpha implementation of the TargetJITInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ALPHA_JITINFO_H
  15 #define ALPHA_JITINFO_H
  16
  17 #include "llvm/Target/TargetJITInfo.h"
  18 #include <map>
  19
  20 namespace llvm {
  21   class TargetMachine;
  22
  23   class AlphaJITInfo : public TargetJITInfo {
  24   protected:
  25     TargetMachine &TM;
  26
  27     //because gpdist are paired and relative to the pc of the first inst,
  28     //we need to have some state
  29     std::map<std::pair<void*, int>, void*> gpdistmap;
  30   public:
  31     explicit AlphaJITInfo(TargetMachine &tm) : TM(tm)
  32     { useGOT = true; }
  33
  34     virtual StubLayout getStubLayout();
  35     virtual void *emitFunctionStub(const Function* F, void *Fn,
  36                                    JITCodeEmitter &JCE);
  37     virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
  38     virtual void relocate(void *Function, MachineRelocation *MR,
  39                           unsigned NumRelocs, unsigned char* GOTBase);
  40
  41     /// replaceMachineCodeForFunction - Make it so that calling the function
  42     /// whose machine code is at OLD turns into a call to NEW, perhaps by
  43     /// overwriting OLD with a branch to NEW.  This is used for self-modifying
  44     /// code.
  45     ///
  46     virtual void replaceMachineCodeForFunction(void *Old, void *New);
  47   private:
  48     static const unsigned GOToffset = 4096;
  49
  50   };
  51 }
  52
  53 #endif