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+//===-- JIT.h - Class definition for the JIT --------------------*- C++ -*-===//
+//
+// 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 __JIT_H
+#define __JIT_H
+
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/PassManager.h"
+
+namespace llvm {
+
+class Function;
+struct JITEvent_EmittedFunctionDetails;
+class MachineCodeEmitter;
+class MachineCodeInfo;
+class TargetJITInfo;
+class TargetMachine;
+
+class JITState {
+private:
+ FunctionPassManager PM; // Passes to compile a function
+ 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() {
+ return PM;
+ }
+
+ Module *getModule() const { return M; }
+ std::vector<AssertingVH<Function> > &getPendingFunctions() {
+ return PendingFunctions;
+ }
+};
+
+
+class JIT : public ExecutionEngine {
+ /// types
+ typedef ValueMap<const BasicBlock *, void *>
+ BasicBlockAddressMapTy;
+ /// data
+ TargetMachine &TM; // The current target we are compiling to
+ TargetJITInfo &TJI; // The JITInfo for the target we are compiling to
+ JITCodeEmitter *JCE; // JCE object
+ JITMemoryManager *JMM;
+ 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;
+
+ /// BasicBlockAddressMap - A mapping between LLVM basic blocks and their
+ /// actualized version, only filled for basic blocks that have their address
+ /// taken.
+ BasicBlockAddressMapTy BasicBlockAddressMap;
+
+
+ JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
+ JITMemoryManager *JMM, bool AllocateGVsWithCode);
+public:
+ ~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,
+ Reloc::Model RM = Reloc::Default,
+ CodeModel::Model CMM = CodeModel::JITDefault) {
+ return ExecutionEngine::createJIT(M, Err, JMM, OptLevel, GVsWithCode,
+ RM, CMM);
+ }
+
+ void addModule(Module *M) override;
+
+ /// removeModule - Remove a Module from the list of modules. Returns true if
+ /// M is found.
+ bool removeModule(Module *M) override;
+
+ /// runFunction - Start execution with the specified function and arguments.
+ ///
+ GenericValue runFunction(Function *F,
+ const std::vector<GenericValue> &ArgValues) override;
+
+ /// getPointerToNamedFunction - This method returns the address of the
+ /// specified function by using the MemoryManager. As such it is only
+ /// useful for resolving library symbols, not code generated symbols.
+ ///
+ /// 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) override;
+
+ // 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) override;
+
+ /// addPointerToBasicBlock - Adds address of the specific basic block.
+ void addPointerToBasicBlock(const BasicBlock *BB, void *Addr);
+
+ /// clearPointerToBasicBlock - Removes address of specific basic block.
+ void clearPointerToBasicBlock(const BasicBlock *BB);
+
+ /// getPointerToBasicBlock - This returns the address of the specified basic
+ /// block, assuming function is compiled.
+ void *getPointerToBasicBlock(BasicBlock *BB) override;
+
+ /// 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) override;
+
+ /// 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) override;
+
+ /// 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) override;
+
+ /// freeMachineCodeForFunction - deallocate memory used to code-generate this
+ /// Function.
+ ///
+ void freeMachineCodeForFunction(Function *F) override;
+
+ /// 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; }
+
+ static ExecutionEngine *createJIT(Module *M,
+ std::string *ErrorStr,
+ JITMemoryManager *JMM,
+ bool GVsWithCode,
+ TargetMachine *TM);
+
+ // Run the JIT on F and return information about the generated code
+ void runJITOnFunction(Function *F, MachineCodeInfo *MCI = nullptr) override;
+
+ void RegisterJITEventListener(JITEventListener *L) override;
+ void UnregisterJITEventListener(JITEventListener *L) override;
+
+ TargetMachine *getTargetMachine() override { return &TM; }
+
+ /// 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);
+
+ BasicBlockAddressMapTy &
+ getBasicBlockAddressMap() {
+ return BasicBlockAddressMap;
+ }
+
+
+private:
+ static JITCodeEmitter *createEmitter(JIT &J, JITMemoryManager *JMM,
+ TargetMachine &tm);
+ void runJITOnFunctionUnlocked(Function *F);
+ void updateFunctionStubUnlocked(Function *F);
+ void jitTheFunctionUnlocked(Function *F);
+
+protected:
+
+ /// getMemoryforGV - Allocate memory for a global variable.
+ char* getMemoryForGV(const GlobalVariable* GV) override;
+
+};
+
+} // End llvm namespace
+
+#endif
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