1 //===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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 JITState(ModuleProvider *MP) : PM(MP) {}
42 FunctionPassManager& getPM(const MutexGuard& locked) {
46 std::vector<const GlobalVariable*>& getPendingGlobals(const MutexGuard& locked) {
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);
63 static void Register() {
67 /// getJITInfo - Return the target JIT information structure.
69 TargetJITInfo &getJITInfo() const { return TJI; }
71 /// create - Create an return a new JIT compiler if there is one available
72 /// for the current target. Otherwise, return null.
74 static ExecutionEngine *create(ModuleProvider *MP);
76 /// run - Start execution with the specified function and arguments.
78 virtual GenericValue runFunction(Function *F,
79 const std::vector<GenericValue> &ArgValues);
81 /// getPointerToNamedFunction - This method returns the address of the
82 /// specified function by using the dlsym function call. As such it is only
83 /// useful for resolving library symbols, not code generated symbols.
85 void *getPointerToNamedFunction(const std::string &Name);
87 // CompilationCallback - Invoked the first time that a call site is found,
88 // which causes lazy compilation of the target function.
90 static void CompilationCallback();
92 /// getPointerToFunction - This returns the address of the specified function,
93 /// compiling it if necessary.
95 void *getPointerToFunction(Function *F);
97 /// getOrEmitGlobalVariable - Return the address of the specified global
98 /// variable, possibly emitting it to memory if needed. This is used by the
100 void *getOrEmitGlobalVariable(const GlobalVariable *GV);
102 /// getPointerToFunctionOrStub - If the specified function has been
103 /// code-gen'd, return a pointer to the function. If not, compile it, or use
104 /// a stub to implement lazy compilation if available.
106 void *getPointerToFunctionOrStub(Function *F);
108 /// recompileAndRelinkFunction - This method is used to force a function
109 /// which has already been compiled, to be compiled again, possibly
110 /// after it has been modified. Then the entry to the old copy is overwritten
111 /// with a branch to the new copy. If there was no old copy, this acts
112 /// just like JIT::getPointerToFunction().
114 void *recompileAndRelinkFunction(Function *F);
116 /// freeMachineCodeForFunction - deallocate memory used to code-generate this
119 void freeMachineCodeForFunction(Function *F);
122 static MachineCodeEmitter *createEmitter(JIT &J);
123 void runJITOnFunction (Function *F);
126 } // End llvm namespace