-//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
+//===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===//
//
-// This file defines the top-level Virtual Machine data structure.
+// 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 VM_H
-#define VM_H
+#ifndef JIT_H
+#define JIT_H
-#include "../ExecutionEngine.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 VM : public ExecutionEngine {
+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
- PassManager PM; // Passes to compile a function
+ TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
MachineCodeEmitter *MCE; // MCE object
- // FunctionRefs - A mapping between addresses that refer to unresolved
- // functions and the LLVM function object itself. This is used by the fault
- // handler to lazily patch up references...
- //
- std::map<void*, Function*> FunctionRefs;
+ JITState state;
+ JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji);
public:
- VM(Module *M, TargetMachine *tm);
- ~VM();
+ ~JIT();
- /// run - Start execution with the specified function and arguments.
- ///
- virtual int run(const std::string &FnName,
- const std::vector<std::string> &Args);
-
- void addFunctionRef(void *Ref, Function *F) {
- FunctionRefs[Ref] = F;
+ static void Register() {
+ JITCtor = create;
}
+
+ /// getJITInfo - Return the target JIT information structure.
+ ///
+ TargetJITInfo &getJITInfo() const { return TJI; }
- const std::string &getFunctionReferencedName(void *RefAddr);
+ /// 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);
- void *resolveFunctionReference(void *RefAddr);
+ /// 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
// CompilationCallback - Invoked the first time that a call site is found,
// which causes lazy compilation of the target function.
- //
+ //
static void CompilationCallback();
- /// runAtExitHandlers - Before exiting the program, at_exit functions must be
- /// called. This method calls them.
+ /// getPointerToFunction - This returns the address of the specified function,
+ /// compiling it if necessary.
///
- static void runAtExitHandlers();
+ void *getPointerToFunction(Function *F);
-private:
- static MachineCodeEmitter *createX86Emitter(VM &V);
- static MachineCodeEmitter *createSparcEmitter(VM &V);
- void setupPassManager();
- void *getPointerToFunction(const Function *F);
-
- void registerCallback();
-
- /// emitStubForFunction - This method is used by the JIT when it needs to emit
- /// the address of a function for a function whose code has not yet been
- /// generated. In order to do this, it generates a stub which jumps to the
- /// lazy function compiler, which will eventually get fixed to call the
- /// function directly.
+ /// 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 *emitStubForFunction(const Function &F);
+ 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