lib/ExecutionEngine/MCJIT/MCJITMemoryManager.h

   1 //===-- MCJITMemoryManager.h - Definition for the Memory Manager ---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 #ifndef LLVM_LIB_EXECUTIONENGINE_MCJITMEMORYMANAGER_H
  11 #define LLVM_LIB_EXECUTIONENGINE_MCJITMEMORYMANAGER_H
  12
  13 #include "llvm/Module.h"
  14 #include "llvm/ExecutionEngine/JITMemoryManager.h"
  15 #include "llvm/ExecutionEngine/RuntimeDyld.h"
  16 #include <assert.h>
  17
  18 namespace llvm {
  19
  20 // The MCJIT memory manager is a layer between the standard JITMemoryManager
  21 // and the RuntimeDyld interface that maps objects, by name, onto their
  22 // matching LLVM IR counterparts in the module(s) being compiled.
  23 class MCJITMemoryManager : public RTDyldMemoryManager {
  24   JITMemoryManager *JMM;
  25
  26   // FIXME: Multiple modules.
  27   Module *M;
  28 public:
  29   MCJITMemoryManager(JITMemoryManager *jmm, Module *m) : JMM(jmm), M(m) {}
  30
  31   // Allocate ActualSize bytes, or more, for the named function. Return
  32   // a pointer to the allocated memory and update Size to reflect how much
  33   // memory was acutally allocated.
  34   uint8_t *startFunctionBody(const char *Name, uintptr_t &Size) {
  35     // FIXME: This should really reference the MCAsmInfo to get the global
  36     //        prefix.
  37     if (Name[0] == '_') ++Name;
  38     Function *F = M->getFunction(Name);
  39     // Some ObjC names have a prefixed \01 in the IR. If we failed to find
  40     // the symbol and it's of the ObjC conventions (starts with "-"), try
  41     // prepending a \01 and see if we can find it that way.
  42     if (!F && Name[0] == '-')
  43       F = M->getFunction((Twine("\1") + Name).str());
  44     assert(F && "No matching function in JIT IR Module!");
  45     return JMM->startFunctionBody(F, Size);
  46   }
  47
  48   // Mark the end of the function, including how much of the allocated
  49   // memory was actually used.
  50   void endFunctionBody(const char *Name, uint8_t *FunctionStart,
  51                        uint8_t *FunctionEnd) {
  52     // FIXME: This should really reference the MCAsmInfo to get the global
  53     //        prefix.
  54     if (Name[0] == '_') ++Name;
  55     Function *F = M->getFunction(Name);
  56     // Some ObjC names have a prefixed \01 in the IR. If we failed to find
  57     // the symbol and it's of the ObjC conventions (starts with "-"), try
  58     // prepending a \01 and see if we can find it that way.
  59     if (!F && Name[0] == '-')
  60       F = M->getFunction((Twine("\1") + Name).str());
  61     assert(F && "No matching function in JIT IR Module!");
  62     JMM->endFunctionBody(F, FunctionStart, FunctionEnd);
  63   }
  64
  65 };
  66
  67 } // End llvm namespace
  68
  69 #endif