include/llvm/ExecutionEngine/RuntimeDyld.h

   1 //===-- RuntimeDyld.h - Run-time dynamic linker for MC-JIT ------*- 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 // Interface for the runtime dynamic linker facilities of the MC-JIT.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_RUNTIME_DYLD_H
  15 #define LLVM_RUNTIME_DYLD_H
  16
  17 #include "llvm/ADT/StringRef.h"
  18 #include "llvm/Support/Memory.h"
  19
  20 namespace llvm {
  21
  22 class RuntimeDyldImpl;
  23 class MemoryBuffer;
  24
  25 // RuntimeDyld clients often want to handle the memory management of
  26 // what gets placed where. For JIT clients, this is an abstraction layer
  27 // over the JITMemoryManager, which references objects by their source
  28 // representations in LLVM IR.
  29 // FIXME: As the RuntimeDyld fills out, additional routines will be needed
  30 //        for the varying types of objects to be allocated.
  31 class RTDyldMemoryManager {
  32   RTDyldMemoryManager(const RTDyldMemoryManager&);  // DO NOT IMPLEMENT
  33   void operator=(const RTDyldMemoryManager&);       // DO NOT IMPLEMENT
  34 public:
  35   RTDyldMemoryManager() {}
  36   virtual ~RTDyldMemoryManager() {}
  37
  38   // Allocate ActualSize bytes, or more, for the named function. Return
  39   // a pointer to the allocated memory and update Size to reflect how much
  40   // memory was acutally allocated.
  41   virtual uint64_t startFunctionBody(const char *Name, uintptr_t &Size) = 0;
  42
  43   // Mark the end of the function, including how much of the allocated
  44   // memory was actually used.
  45   virtual void endFunctionBody(const char *Name, uint64_t FunctionStart,
  46                                uint64_t FunctionEnd) = 0;
  47 };
  48
  49 class RuntimeDyld {
  50   RuntimeDyld(const RuntimeDyld &);     // DO NOT IMPLEMENT
  51   void operator=(const RuntimeDyld &);  // DO NOT IMPLEMENT
  52
  53   // RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
  54   // interface.
  55   RuntimeDyldImpl *Dyld;
  56 public:
  57   RuntimeDyld(RTDyldMemoryManager*);
  58   ~RuntimeDyld();
  59
  60   bool loadObject(MemoryBuffer *InputBuffer);
  61   uint64_t getSymbolAddress(StringRef Name);
  62   void reassignSymbolAddress(StringRef Name, uint64_t Addr);
  63   // FIXME: Should be parameterized to get the memory block associated with
  64   // a particular loaded object.
  65   sys::MemoryBlock getMemoryBlock();
  66   StringRef getErrorString();
  67 };
  68
  69 } // end namespace llvm
  70
  71 #endif