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"
19 #include "llvm/Support/ValueHandle.h"
24 struct JITEvent_EmittedFunctionDetails;
25 class MachineCodeEmitter;
26 class MachineCodeInfo;
32 FunctionPassManager PM; // Passes to compile a function
33 Module *M; // Module used to create the PM
35 /// PendingFunctions - Functions which have not been code generated yet, but
36 /// were called from a function being code generated.
37 std::vector<AssertingVH<Function> > PendingFunctions;
40 explicit JITState(Module *M) : PM(M), M(M) {}
42 FunctionPassManager &getPM(const MutexGuard &L) {
46 Module *getModule() const { return M; }
47 std::vector<AssertingVH<Function> > &getPendingFunctions(const MutexGuard &L){
48 return PendingFunctions;
53 class JIT : public ExecutionEngine {
55 typedef ValueMap<const BasicBlock *, void *>
56 BasicBlockAddressMapTy;
58 TargetMachine &TM; // The current target we are compiling to
59 TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
60 JITCodeEmitter *JCE; // JCE object
61 std::vector<JITEventListener*> EventListeners;
63 /// AllocateGVsWithCode - Some applications require that global variables and
64 /// code be allocated into the same region of memory, in which case this flag
65 /// should be set to true. Doing so breaks freeMachineCodeForFunction.
66 bool AllocateGVsWithCode;
68 /// True while the JIT is generating code. Used to assert against recursive
70 bool isAlreadyCodeGenerating;
74 /// BasicBlockAddressMap - A mapping between LLVM basic blocks and their
75 /// actualized version, only filled for basic blocks that have their address
77 BasicBlockAddressMapTy BasicBlockAddressMap;
80 JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
81 JITMemoryManager *JMM, CodeGenOpt::Level OptLevel,
82 bool AllocateGVsWithCode);
86 static void Register() {
90 /// getJITInfo - Return the target JIT information structure.
92 TargetJITInfo &getJITInfo() const { return TJI; }
94 /// create - Create an return a new JIT compiler if there is one available
95 /// for the current target. Otherwise, return null.
97 static ExecutionEngine *create(Module *M,
99 JITMemoryManager *JMM,
100 CodeGenOpt::Level OptLevel =
102 bool GVsWithCode = true,
103 CodeModel::Model CMM = CodeModel::Default) {
104 return ExecutionEngine::createJIT(M, Err, JMM, OptLevel, GVsWithCode,
108 virtual void addModule(Module *M);
110 /// removeModule - Remove a Module from the list of modules. Returns true if
112 virtual bool removeModule(Module *M);
114 /// runFunction - Start execution with the specified function and arguments.
116 virtual GenericValue runFunction(Function *F,
117 const std::vector<GenericValue> &ArgValues);
119 /// getPointerToNamedFunction - This method returns the address of the
120 /// specified function by using the dlsym function call. As such it is only
121 /// useful for resolving library symbols, not code generated symbols.
123 /// If AbortOnFailure is false and no function with the given name is
124 /// found, this function silently returns a null pointer. Otherwise,
125 /// it prints a message to stderr and aborts.
127 void *getPointerToNamedFunction(const std::string &Name,
128 bool AbortOnFailure = true);
130 // CompilationCallback - Invoked the first time that a call site is found,
131 // which causes lazy compilation of the target function.
133 static void CompilationCallback();
135 /// getPointerToFunction - This returns the address of the specified function,
136 /// compiling it if necessary.
138 void *getPointerToFunction(Function *F);
140 /// addPointerToBasicBlock - Adds address of the specific basic block.
141 void addPointerToBasicBlock(const BasicBlock *BB, void *Addr);
143 /// clearPointerToBasicBlock - Removes address of specific basic block.
144 void clearPointerToBasicBlock(const BasicBlock *BB);
146 /// getPointerToBasicBlock - This returns the address of the specified basic
147 /// block, assuming function is compiled.
148 void *getPointerToBasicBlock(BasicBlock *BB);
150 /// getOrEmitGlobalVariable - Return the address of the specified global
151 /// variable, possibly emitting it to memory if needed. This is used by the
153 void *getOrEmitGlobalVariable(const GlobalVariable *GV);
155 /// getPointerToFunctionOrStub - If the specified function has been
156 /// code-gen'd, return a pointer to the function. If not, compile it, or use
157 /// a stub to implement lazy compilation if available.
159 void *getPointerToFunctionOrStub(Function *F);
161 /// recompileAndRelinkFunction - This method is used to force a function
162 /// which has already been compiled, to be compiled again, possibly
163 /// after it has been modified. Then the entry to the old copy is overwritten
164 /// with a branch to the new copy. If there was no old copy, this acts
165 /// just like JIT::getPointerToFunction().
167 void *recompileAndRelinkFunction(Function *F);
169 /// freeMachineCodeForFunction - deallocate memory used to code-generate this
172 void freeMachineCodeForFunction(Function *F);
174 /// addPendingFunction - while jitting non-lazily, a called but non-codegen'd
175 /// function was encountered. Add it to a pending list to be processed after
176 /// the current function.
178 void addPendingFunction(Function *F);
180 /// getCodeEmitter - Return the code emitter this JIT is emitting into.
182 JITCodeEmitter *getCodeEmitter() const { return JCE; }
184 /// selectTarget - Pick a target either via -march or by guessing the native
185 /// arch. Add any CPU features specified via -mcpu or -mattr.
186 static TargetMachine *selectTarget(Module *M,
189 const SmallVectorImpl<std::string>& MAttrs,
192 static ExecutionEngine *createJIT(Module *M,
193 std::string *ErrorStr,
194 JITMemoryManager *JMM,
195 CodeGenOpt::Level OptLevel,
197 CodeModel::Model CMM,
200 const SmallVectorImpl<std::string>& MAttrs);
202 // Run the JIT on F and return information about the generated code
203 void runJITOnFunction(Function *F, MachineCodeInfo *MCI = 0);
205 virtual void RegisterJITEventListener(JITEventListener *L);
206 virtual void UnregisterJITEventListener(JITEventListener *L);
207 /// These functions correspond to the methods on JITEventListener. They
208 /// iterate over the registered listeners and call the corresponding method on
210 void NotifyFunctionEmitted(
211 const Function &F, void *Code, size_t Size,
212 const JITEvent_EmittedFunctionDetails &Details);
213 void NotifyFreeingMachineCode(void *OldPtr);
215 BasicBlockAddressMapTy &
216 getBasicBlockAddressMap(const MutexGuard &) {
217 return BasicBlockAddressMap;
222 static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM,
224 void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked);
225 void updateFunctionStub(Function *F);
226 void jitTheFunction(Function *F, const MutexGuard &locked);
230 /// getMemoryforGV - Allocate memory for a global variable.
231 virtual char* getMemoryForGV(const GlobalVariable* GV);
235 } // End llvm namespace