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 70
