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129 lines
4.0 KiB
C++
129 lines
4.0 KiB
C++
//===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the top-level JIT data structure.
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//
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//===----------------------------------------------------------------------===//
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#ifndef JIT_H
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#define JIT_H
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/PassManager.h"
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#include <map>
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namespace llvm {
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class Function;
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class GlobalValue;
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class Constant;
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class TargetMachine;
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class TargetJITInfo;
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class MachineCodeEmitter;
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class JITState {
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private:
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FunctionPassManager PM; // Passes to compile a function
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/// PendingGlobals - Global variables which have had memory allocated for them
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/// while a function was code generated, but which have not been initialized
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/// yet.
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std::vector<const GlobalVariable*> PendingGlobals;
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public:
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JITState(ModuleProvider *MP) : PM(MP) {}
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FunctionPassManager& getPM(const MutexGuard& locked) {
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return PM;
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}
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std::vector<const GlobalVariable*>& getPendingGlobals(const MutexGuard& locked) {
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return PendingGlobals;
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}
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};
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class JIT : public ExecutionEngine {
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TargetMachine &TM; // The current target we are compiling to
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TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
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MachineCodeEmitter *MCE; // MCE object
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JITState state;
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JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji);
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public:
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~JIT();
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static void Register() {
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JITCtor = create;
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}
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/// getJITInfo - Return the target JIT information structure.
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///
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TargetJITInfo &getJITInfo() const { return TJI; }
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/// create - Create an return a new JIT compiler if there is one available
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/// for the current target. Otherwise, return null.
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///
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static ExecutionEngine *create(ModuleProvider *MP);
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/// run - Start execution with the specified function and arguments.
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///
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virtual GenericValue runFunction(Function *F,
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const std::vector<GenericValue> &ArgValues);
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/// getPointerToNamedFunction - This method returns the address of the
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/// specified function by using the dlsym function call. As such it is only
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/// useful for resolving library symbols, not code generated symbols.
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///
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void *getPointerToNamedFunction(const std::string &Name);
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// CompilationCallback - Invoked the first time that a call site is found,
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// which causes lazy compilation of the target function.
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//
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static void CompilationCallback();
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/// getPointerToFunction - This returns the address of the specified function,
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/// compiling it if necessary.
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///
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void *getPointerToFunction(Function *F);
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/// getOrEmitGlobalVariable - Return the address of the specified global
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/// variable, possibly emitting it to memory if needed. This is used by the
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/// Emitter.
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void *getOrEmitGlobalVariable(const GlobalVariable *GV);
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/// getPointerToFunctionOrStub - If the specified function has been
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/// code-gen'd, return a pointer to the function. If not, compile it, or use
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/// a stub to implement lazy compilation if available.
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///
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void *getPointerToFunctionOrStub(Function *F);
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/// recompileAndRelinkFunction - This method is used to force a function
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/// which has already been compiled, to be compiled again, possibly
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/// after it has been modified. Then the entry to the old copy is overwritten
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/// with a branch to the new copy. If there was no old copy, this acts
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/// just like JIT::getPointerToFunction().
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///
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void *recompileAndRelinkFunction(Function *F);
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/// freeMachineCodeForFunction - deallocate memory used to code-generate this
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/// Function.
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///
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void freeMachineCodeForFunction(Function *F);
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private:
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static MachineCodeEmitter *createEmitter(JIT &J);
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void runJITOnFunction (Function *F);
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};
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} // End llvm namespace
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#endif
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