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//===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the top-level JIT data structure.
//
//===----------------------------------------------------------------------===//
#ifndef JIT_H
#define JIT_H
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/PassManager.h"
#include <map>
namespace llvm {
class Function;
class GlobalValue;
class Constant;
class TargetMachine;
class TargetJITInfo;
class MachineCodeEmitter;
class JITState {
private:
FunctionPassManager PM; // Passes to compile a function
/// PendingGlobals - Global variables which have had memory allocated for them
/// while a function was code generated, but which have not been initialized
/// yet.
std::vector<const GlobalVariable*> PendingGlobals;
public:
JITState(ModuleProvider *MP) : PM(MP) {}
FunctionPassManager& getPM(const MutexGuard& locked) {
return PM;
}
std::vector<const GlobalVariable*>& getPendingGlobals(const MutexGuard& locked) {
return PendingGlobals;
}
};
class JIT : public ExecutionEngine {
TargetMachine &TM; // The current target we are compiling to
TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
MachineCodeEmitter *MCE; // MCE object
JITState state;
JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji);
public:
~JIT();
static void Register() {
JITCtor = create;
}
/// getJITInfo - Return the target JIT information structure.
///
TargetJITInfo &getJITInfo() const { return TJI; }
/// create - Create an return a new JIT compiler if there is one available
/// for the current target. Otherwise, return null.
///
static ExecutionEngine *create(ModuleProvider *MP, std::string* = 0);
/// run - Start execution with the specified function and arguments.
///
virtual GenericValue runFunction(Function *F,
const std::vector<GenericValue> &ArgValues);
/// getPointerToNamedFunction - This method returns the address of the
/// specified function by using the dlsym function call. As such it is only
/// useful for resolving library symbols, not code generated symbols.
///
void *getPointerToNamedFunction(const std::string &Name);
// CompilationCallback - Invoked the first time that a call site is found,
// which causes lazy compilation of the target function.
//
static void CompilationCallback();
/// getPointerToFunction - This returns the address of the specified function,
/// compiling it if necessary.
///
void *getPointerToFunction(Function *F);
/// getOrEmitGlobalVariable - Return the address of the specified global
/// variable, possibly emitting it to memory if needed. This is used by the
/// Emitter.
void *getOrEmitGlobalVariable(const GlobalVariable *GV);
/// getPointerToFunctionOrStub - If the specified function has been
/// code-gen'd, return a pointer to the function. If not, compile it, or use
/// a stub to implement lazy compilation if available.
///
void *getPointerToFunctionOrStub(Function *F);
/// recompileAndRelinkFunction - This method is used to force a function
/// which has already been compiled, to be compiled again, possibly
/// after it has been modified. Then the entry to the old copy is overwritten
/// with a branch to the new copy. If there was no old copy, this acts
/// just like JIT::getPointerToFunction().
///
void *recompileAndRelinkFunction(Function *F);
/// freeMachineCodeForFunction - deallocate memory used to code-generate this
/// Function.
///
void freeMachineCodeForFunction(Function *F);
/// getCodeEmitter - Return the code emitter this JIT is emitting into.
MachineCodeEmitter *getCodeEmitter() const { return MCE; }
private:
static MachineCodeEmitter *createEmitter(JIT &J);
void runJITOnFunction (Function *F);
};
} // End llvm namespace
#endif
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