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;
30 class JIT : public ExecutionEngine {
31 TargetMachine &TM; // The current target we are compiling to
32 TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
34 FunctionPassManager PM; // Passes to compile a function
35 MachineCodeEmitter *MCE; // MCE object
37 /// PendingGlobals - Global variables which have had memory allocated for them
38 /// while a function was code generated, but which have not been initialized
40 std::vector<const GlobalVariable*> PendingGlobals;
42 JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji);
46 /// getJITInfo - Return the target JIT information structure.
48 TargetJITInfo &getJITInfo() const { return TJI; }
50 /// create - Create an return a new JIT compiler if there is one available
51 /// for the current target. Otherwise, return null. If the JIT is created
52 /// successfully, it takes responsibility for deleting the specified
53 /// IntrinsicLowering implementation.
55 static ExecutionEngine *create(ModuleProvider *MP, IntrinsicLowering *IL = 0);
57 /// run - Start execution with the specified function and arguments.
59 virtual GenericValue runFunction(Function *F,
60 const std::vector<GenericValue> &ArgValues);
62 /// getPointerToNamedFunction - This method returns the address of the
63 /// specified function by using the dlsym function call. As such it is only
64 /// useful for resolving library symbols, not code generated symbols.
66 void *getPointerToNamedFunction(const std::string &Name);
68 // CompilationCallback - Invoked the first time that a call site is found,
69 // which causes lazy compilation of the target function.
71 static void CompilationCallback();
73 /// getPointerToFunction - This returns the address of the specified function,
74 /// compiling it if necessary.
76 void *getPointerToFunction(Function *F);
78 /// getOrEmitGlobalVariable - Return the address of the specified global
79 /// variable, possibly emitting it to memory if needed. This is used by the
81 void *getOrEmitGlobalVariable(const GlobalVariable *GV);
83 /// getPointerToFunctionOrStub - If the specified function has been
84 /// code-gen'd, return a pointer to the function. If not, compile it, or use
85 /// a stub to implement lazy compilation if available.
87 void *getPointerToFunctionOrStub(Function *F);
89 /// recompileAndRelinkFunction - This method is used to force a function
90 /// which has already been compiled, to be compiled again, possibly
91 /// after it has been modified. Then the entry to the old copy is overwritten
92 /// with a branch to the new copy. If there was no old copy, this acts
93 /// just like JIT::getPointerToFunction().
95 void *recompileAndRelinkFunction(Function *F);
97 /// freeMachineCodeForFunction - deallocate memory used to code-generate this
100 void freeMachineCodeForFunction(Function *F);
103 static MachineCodeEmitter *createEmitter(JIT &J);
104 void runJITOnFunction (Function *F);
107 } // End llvm namespace