1 //===-- MCJITMemoryManager.h - Definition for the Memory Manager ---C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_LIB_EXECUTIONENGINE_MCJITMEMORYMANAGER_H
11 #define LLVM_LIB_EXECUTIONENGINE_MCJITMEMORYMANAGER_H
13 #include "llvm/Module.h"
14 #include "llvm/ExecutionEngine/JITMemoryManager.h"
15 #include "llvm/ExecutionEngine/RuntimeDyld.h"
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;
26 // FIXME: Multiple modules.
29 MCJITMemoryManager(JITMemoryManager *jmm) : JMM(jmm) {}
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 uint64_t startFunctionBody(const char *Name, uintptr_t &Size) {
35 Function *F = M->getFunction(Name);
36 assert(F && "No matching function in JIT IR Module!");
37 return (uint64_t)JMM->startFunctionBody(F, Size);
40 // Mark the end of the function, including how much of the allocated
41 // memory was actually used.
42 void endFunctionBody(const char *Name, uint64_t FunctionStart,
43 uint64_t FunctionEnd) {
44 Function *F = M->getFunction(Name);
45 assert(F && "No matching function in JIT IR Module!");
46 // The JITMemoryManager interface makes the unfortunate assumption that
47 // the address space/sizes we're compiling on are the same as what we're
48 // compiling for, so it uses pointer types for its addresses. Explicit
49 // casts between them to deal with that.
50 return JMM->endFunctionBody(F, (uint8_t*)FunctionStart,
51 (uint8_t*)FunctionEnd);
56 } // End llvm namespace