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"
25 class MachineCodeEmitter;
26 class MachineCodeInfo;
30 FunctionPassManager PM; // Passes to compile a function
31 ModuleProvider *MP; // ModuleProvider used to create the PM
33 /// PendingFunctions - Functions which have not been code generated yet, but
34 /// were called from a function being code generated.
35 std::vector<Function*> PendingFunctions;
38 explicit JITState(ModuleProvider *MP) : PM(MP), MP(MP) {}
40 FunctionPassManager &getPM(const MutexGuard &L) {
44 ModuleProvider *getMP() const { return MP; }
45 std::vector<Function*> &getPendingFunctions(const MutexGuard &L) {
46 return PendingFunctions;
51 class JIT : public ExecutionEngine {
52 TargetMachine &TM; // The current target we are compiling to
53 TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
54 JITCodeEmitter *JCE; // JCE object
58 JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
59 JITMemoryManager *JMM, CodeGenOpt::Level OptLevel);
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, std::string *Err,
75 CodeGenOpt::Level OptLevel =
76 CodeGenOpt::Default) {
77 return createJIT(MP, Err, 0, OptLevel);
80 virtual void addModuleProvider(ModuleProvider *MP);
82 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
83 /// Relases the Module from the ModuleProvider, materializing it in the
84 /// process, and returns the materialized Module.
85 virtual Module *removeModuleProvider(ModuleProvider *MP,
86 std::string *ErrInfo = 0);
88 /// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
89 /// and deletes the ModuleProvider and owned Module. Avoids materializing
90 /// the underlying module.
91 virtual void deleteModuleProvider(ModuleProvider *P,std::string *ErrInfo = 0);
93 /// runFunction - Start execution with the specified function and arguments.
95 virtual GenericValue runFunction(Function *F,
96 const std::vector<GenericValue> &ArgValues);
98 /// getPointerToNamedFunction - This method returns the address of the
99 /// specified function by using the dlsym function call. As such it is only
100 /// useful for resolving library symbols, not code generated symbols.
102 /// If AbortOnFailure is false and no function with the given name is
103 /// found, this function silently returns a null pointer. Otherwise,
104 /// it prints a message to stderr and aborts.
106 void *getPointerToNamedFunction(const std::string &Name,
107 bool AbortOnFailure = true);
109 // CompilationCallback - Invoked the first time that a call site is found,
110 // which causes lazy compilation of the target function.
112 static void CompilationCallback();
114 /// getPointerToFunction - This returns the address of the specified function,
115 /// compiling it if necessary.
117 void *getPointerToFunction(Function *F);
119 /// getOrEmitGlobalVariable - Return the address of the specified global
120 /// variable, possibly emitting it to memory if needed. This is used by the
122 void *getOrEmitGlobalVariable(const GlobalVariable *GV);
124 /// getPointerToFunctionOrStub - If the specified function has been
125 /// code-gen'd, return a pointer to the function. If not, compile it, or use
126 /// a stub to implement lazy compilation if available.
128 void *getPointerToFunctionOrStub(Function *F);
130 /// recompileAndRelinkFunction - This method is used to force a function
131 /// which has already been compiled, to be compiled again, possibly
132 /// after it has been modified. Then the entry to the old copy is overwritten
133 /// with a branch to the new copy. If there was no old copy, this acts
134 /// just like JIT::getPointerToFunction().
136 void *recompileAndRelinkFunction(Function *F);
138 /// freeMachineCodeForFunction - deallocate memory used to code-generate this
141 void freeMachineCodeForFunction(Function *F);
143 /// addPendingFunction - while jitting non-lazily, a called but non-codegen'd
144 /// function was encountered. Add it to a pending list to be processed after
145 /// the current function.
147 void addPendingFunction(Function *F);
149 /// getCodeEmitter - Return the code emitter this JIT is emitting into.
150 JITCodeEmitter *getCodeEmitter() const { return JCE; }
152 static ExecutionEngine *createJIT(ModuleProvider *MP, std::string *Err,
153 JITMemoryManager *JMM,
154 CodeGenOpt::Level OptLevel);
157 // Run the JIT on F and return information about the generated code
158 void runJITOnFunction(Function *F, MachineCodeInfo *MCI = 0);
161 static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM);
162 void registerMachineCodeInfo(MachineCodeInfo *MCI);
163 void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked);
164 void updateFunctionStub(Function *F);
165 void updateDlsymStubTable();
169 /// getMemoryforGV - Allocate memory for a global variable.
170 virtual char* getMemoryForGV(const GlobalVariable* GV);
174 } // End llvm namespace