-//===-- 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 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>
+#include "llvm/Support/ValueHandle.h"
+
+namespace llvm {
class Function;
-class GlobalValue;
-class Constant;
-class TargetMachine;
+struct JITEvent_EmittedFunctionDetails;
class MachineCodeEmitter;
+class MachineCodeInfo;
+class TargetJITInfo;
+class TargetMachine;
-class VM : public ExecutionEngine {
- TargetMachine &TM; // The current target we are compiling to
+class JITState {
+private:
FunctionPassManager PM; // Passes to compile a function
- MachineCodeEmitter *MCE; // MCE object
+ Module *M; // Module used to create the PM
+
+ /// PendingFunctions - Functions which have not been code generated yet, but
+ /// were called from a function being code generated.
+ std::vector<AssertingVH<Function> > PendingFunctions;
+
+public:
+ explicit JITState(Module *M) : PM(M), M(M) {}
+ FunctionPassManager &getPM(const MutexGuard &L) {
+ return PM;
+ }
+
+ Module *getModule() const { return M; }
+ std::vector<AssertingVH<Function> > &getPendingFunctions(const MutexGuard &L){
+ return PendingFunctions;
+ }
+};
+
+
+class JIT : public ExecutionEngine {
+ TargetMachine &TM; // The current target we are compiling to
+ TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
+ JITCodeEmitter *JCE; // JCE object
+ std::vector<JITEventListener*> EventListeners;
+
+ /// AllocateGVsWithCode - Some applications require that global variables and
+ /// code be allocated into the same region of memory, in which case this flag
+ /// should be set to true. Doing so breaks freeMachineCodeForFunction.
+ bool AllocateGVsWithCode;
+
+ /// True while the JIT is generating code. Used to assert against recursive
+ /// entry.
+ bool isAlreadyCodeGenerating;
+
+ JITState *jitstate;
+
+ JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
+ JITMemoryManager *JMM, CodeGenOpt::Level OptLevel,
+ bool AllocateGVsWithCode);
public:
- VM(Module *M, TargetMachine *tm);
- ~VM();
+ ~JIT();
+
+ static void Register() {
+ JITCtor = createJIT;
+ }
+
+ /// 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(Module *M,
+ std::string *Err,
+ JITMemoryManager *JMM,
+ CodeGenOpt::Level OptLevel =
+ CodeGenOpt::Default,
+ bool GVsWithCode = true,
+ CodeModel::Model CMM = CodeModel::Default) {
+ return ExecutionEngine::createJIT(M, Err, JMM, OptLevel, GVsWithCode,
+ CMM);
+ }
- /// run - Start execution with the specified function and arguments.
+ virtual void addModule(Module *M);
+
+ /// removeModule - Remove a Module from the list of modules. Returns true if
+ /// M is found.
+ virtual bool removeModule(Module *M);
+
+ /// runFunction - Start execution with the specified function and arguments.
///
- virtual int run(const std::string &FnName,
- const std::vector<std::string> &Args);
+ 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);
+ /// If AbortOnFailure is false and no function with the given name is
+ /// found, this function silently returns a null pointer. Otherwise,
+ /// it prints a message to stderr and aborts.
+ ///
+ void *getPointerToNamedFunction(const std::string &Name,
+ bool AbortOnFailure = true);
// 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.
- ///
- static void runAtExitHandlers();
-
/// getPointerToFunction - This returns the address of the specified function,
/// compiling it if necessary.
+ ///
void *getPointerToFunction(Function *F);
+ void *getPointerToBasicBlock(BasicBlock *BB) {
+ assert(0 && "JIT does not support address-of-label yet!");
+ return 0;
+ }
+
+ /// 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);
+
+ /// addPendingFunction - while jitting non-lazily, a called but non-codegen'd
+ /// function was encountered. Add it to a pending list to be processed after
+ /// the current function.
+ ///
+ void addPendingFunction(Function *F);
+
+ /// getCodeEmitter - Return the code emitter this JIT is emitting into.
+ ///
+ JITCodeEmitter *getCodeEmitter() const { return JCE; }
+
+ /// selectTarget - Pick a target either via -march or by guessing the native
+ /// arch. Add any CPU features specified via -mcpu or -mattr.
+ static TargetMachine *selectTarget(Module *M,
+ StringRef MArch,
+ StringRef MCPU,
+ const SmallVectorImpl<std::string>& MAttrs,
+ std::string *Err);
+
+ static ExecutionEngine *createJIT(Module *M,
+ std::string *ErrorStr,
+ JITMemoryManager *JMM,
+ CodeGenOpt::Level OptLevel,
+ bool GVsWithCode,
+ CodeModel::Model CMM,
+ StringRef MArch,
+ StringRef MCPU,
+ const SmallVectorImpl<std::string>& MAttrs);
+
+ // Run the JIT on F and return information about the generated code
+ void runJITOnFunction(Function *F, MachineCodeInfo *MCI = 0);
+
+ virtual void RegisterJITEventListener(JITEventListener *L);
+ virtual void UnregisterJITEventListener(JITEventListener *L);
+ /// These functions correspond to the methods on JITEventListener. They
+ /// iterate over the registered listeners and call the corresponding method on
+ /// each.
+ void NotifyFunctionEmitted(
+ const Function &F, void *Code, size_t Size,
+ const JITEvent_EmittedFunctionDetails &Details);
+ void NotifyFreeingMachineCode(void *OldPtr);
+
private:
- static MachineCodeEmitter *createEmitter(VM &V);
- void setupPassManager();
+ static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM,
+ TargetMachine &tm);
+ void runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked);
+ void updateFunctionStub(Function *F);
+
+protected:
+
+ /// getMemoryforGV - Allocate memory for a global variable.
+ virtual char* getMemoryForGV(const GlobalVariable* GV);
+
};
+} // End llvm namespace
+
#endif
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