1 //===-- JIT.h - Class definition for the JIT --------------------*- 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 // This file defines the top-level JIT data structure.
12 //===----------------------------------------------------------------------===//
17 #include "llvm/ExecutionEngine/ExecutionEngine.h"
18 #include "llvm/PassManager.h"
28 class MachineCodeEmitter;
32 FunctionPassManager PM; // Passes to compile a function
34 /// PendingGlobals - Global variables which have had memory allocated for them
35 /// while a function was code generated, but which have not been initialized
37 std::vector<const GlobalVariable*> PendingGlobals;
40 explicit JITState(ModuleProvider *MP) : PM(MP) {}
42 FunctionPassManager &getPM(const MutexGuard &L) {
46 std::vector<const GlobalVariable*> &getPendingGlobals(const MutexGuard &L) {
47 return PendingGlobals;
52 class JIT : public ExecutionEngine {
53 TargetMachine &TM; // The current target we are compiling to
54 TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
55 MachineCodeEmitter *MCE; // MCE object
59 JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
60 JITMemoryManager *JMM);
64 static void Register() {
68 /// getJITInfo - Return the target JIT information structure.
70 TargetJITInfo &getJITInfo() const { return TJI; }
72 /// create - Create an return a new JIT compiler if there is one available
73 /// for the current target. Otherwise, return null.
75 static ExecutionEngine *create(ModuleProvider *MP, std::string *Err) {
76 return createJIT(MP, Err, 0);
79 virtual void addModuleProvider(ModuleProvider *MP);
80 virtual Module *removeModuleProvider(ModuleProvider *MP,
81 std::string *ErrInfo = 0);
83 /// run - Start execution with the specified function and arguments.
85 virtual GenericValue runFunction(Function *F,
86 const std::vector<GenericValue> &ArgValues);
88 /// getPointerToNamedFunction - This method returns the address of the
89 /// specified function by using the dlsym function call. As such it is only
90 /// useful for resolving library symbols, not code generated symbols.
92 void *getPointerToNamedFunction(const std::string &Name);
94 // CompilationCallback - Invoked the first time that a call site is found,
95 // which causes lazy compilation of the target function.
97 static void CompilationCallback();
99 /// getPointerToFunction - This returns the address of the specified function,
100 /// compiling it if necessary.
102 void *getPointerToFunction(Function *F);
104 /// getOrEmitGlobalVariable - Return the address of the specified global
105 /// variable, possibly emitting it to memory if needed. This is used by the
107 void *getOrEmitGlobalVariable(const GlobalVariable *GV);
109 /// getPointerToFunctionOrStub - If the specified function has been
110 /// code-gen'd, return a pointer to the function. If not, compile it, or use
111 /// a stub to implement lazy compilation if available.
113 void *getPointerToFunctionOrStub(Function *F);
115 /// recompileAndRelinkFunction - This method is used to force a function
116 /// which has already been compiled, to be compiled again, possibly
117 /// after it has been modified. Then the entry to the old copy is overwritten
118 /// with a branch to the new copy. If there was no old copy, this acts
119 /// just like JIT::getPointerToFunction().
121 void *recompileAndRelinkFunction(Function *F);
123 /// freeMachineCodeForFunction - deallocate memory used to code-generate this
126 void freeMachineCodeForFunction(Function *F);
128 /// getCodeEmitter - Return the code emitter this JIT is emitting into.
129 MachineCodeEmitter *getCodeEmitter() const { return MCE; }
131 static ExecutionEngine *createJIT(ModuleProvider *MP, std::string *Err,
132 JITMemoryManager *JMM);
135 static MachineCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM);
136 void runJITOnFunction (Function *F);
139 } // End llvm namespace