//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- 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 abstract interface that implements execution support
// for LLVM.
//
#ifndef EXECUTION_ENGINE_H
#define EXECUTION_ENGINE_H
-#include "llvm/ModuleProvider.h"
#include <vector>
-#include <string>
#include <map>
#include <cassert>
+#include <string>
+#include "llvm/System/Mutex.h"
+#include "llvm/ADT/SmallVector.h"
+
+namespace llvm {
+
+struct GenericValue;
class Constant;
class Function;
-union GenericValue;
+class GlobalVariable;
class GlobalValue;
class Module;
+class ModuleProvider;
class TargetData;
class Type;
+class MutexGuard;
-class ExecutionEngine {
- Module &CurMod;
- const TargetData *TD;
+class ExecutionEngineState {
+private:
+ /// GlobalAddressMap - A mapping between LLVM global values and their
+ /// actualized version...
+ std::map<const GlobalValue*, void *> GlobalAddressMap;
-protected:
- ModuleProvider *MP;
- // GlobalAddress - A mapping between LLVM global values and their actualized
- // version...
- std::map<const GlobalValue*, void *> GlobalAddress;
+ /// GlobalAddressReverseMap - This is the reverse mapping of GlobalAddressMap,
+ /// used to convert raw addresses into the LLVM global value that is emitted
+ /// at the address. This map is not computed unless getGlobalValueAtAddress
+ /// is called at some point.
+ std::map<void *, const GlobalValue*> GlobalAddressReverseMap;
- void setTargetData(const TargetData &td) {
- TD = &td;
+public:
+ std::map<const GlobalValue*, void *> &
+ getGlobalAddressMap(const MutexGuard &locked) {
+ return GlobalAddressMap;
}
-public:
- ExecutionEngine(ModuleProvider *P) : CurMod(*(P->getModule())), MP(P) {
- assert(P && "ModuleProvider is null?");
+ std::map<void*, const GlobalValue*> &
+ getGlobalAddressReverseMap(const MutexGuard& locked) {
+ return GlobalAddressReverseMap;
}
- ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
- assert(M && "Module is null?");
+};
+
+
+class ExecutionEngine {
+ const TargetData *TD;
+ ExecutionEngineState state;
+ bool LazyCompilationDisabled;
+protected:
+ /// Modules - This is a list of ModuleProvider's that we are JIT'ing from. We
+ /// use a smallvector to optimize for the case where there is only one module.
+ SmallVector<ModuleProvider*, 1> Modules;
+
+ void setTargetData(const TargetData *td) {
+ TD = td;
}
+
+ // To avoid having libexecutionengine depend on the JIT and interpreter
+ // libraries, the JIT and Interpreter set these functions to ctor pointers
+ // at startup time if they are linked in.
+ typedef ExecutionEngine *(*EECtorFn)(ModuleProvider*, std::string*);
+ static EECtorFn JITCtor, InterpCtor;
+
+public:
+ /// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
+ /// JITEmitter classes. It must be held while changing the internal state of
+ /// any of those classes.
+ sys::Mutex lock; // Used to make this class and subclasses thread-safe
+
+ ExecutionEngine(ModuleProvider *P);
+ ExecutionEngine(Module *M);
virtual ~ExecutionEngine();
+
+ const TargetData *getTargetData() const { return TD; }
+
+ /// addModuleProvider - Add a ModuleProvider to the list of modules that we
+ /// can JIT from. Note that this takes ownership of the ModuleProvider: when
+ /// the ExecutionEngine is destroyed, it destroys the MP as well.
+ void addModuleProvider(ModuleProvider *P) {
+ Modules.push_back(P);
+ }
+
+ /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
+ /// Release module from ModuleProvider.
+ Module* removeModuleProvider(ModuleProvider *P, std::string *ErrInfo = 0);
+
+ /// FindFunctionNamed - Search all of the active modules to find the one that
+ /// defines FnName. This is very slow operation and shouldn't be used for
+ /// general code.
+ Function *FindFunctionNamed(const char *FnName);
- Module &getModule() const { return CurMod; }
- const TargetData &getTargetData() const { return *TD; }
+ /// create - This is the factory method for creating an execution engine which
+ /// is appropriate for the current machine.
+ static ExecutionEngine *create(ModuleProvider *MP,
+ bool ForceInterpreter = false,
+ std::string *ErrorStr = 0);
- /// run - Start execution with the specified function, arguments, and
- /// environment.
+ /// runFunction - Execute the specified function with the specified arguments,
+ /// and return the result.
///
- virtual GenericValue run(Function *F,
- const std::vector<GenericValue> &ArgValues) = 0;
+ virtual GenericValue runFunction(Function *F,
+ const std::vector<GenericValue> &ArgValues) = 0;
- static ExecutionEngine *create(ModuleProvider *MP, bool ForceInterpreter,
- bool TraceMode);
+ /// runStaticConstructorsDestructors - This method is used to execute all of
+ /// the static constructors or destructors for a module, depending on the
+ /// value of isDtors.
+ void runStaticConstructorsDestructors(bool isDtors);
+
+
+ /// runFunctionAsMain - This is a helper function which wraps runFunction to
+ /// handle the common task of starting up main with the specified argc, argv,
+ /// and envp parameters.
+ int runFunctionAsMain(Function *Fn, const std::vector<std::string> &argv,
+ const char * const * envp);
- void addGlobalMapping(const Function *F, void *Addr) {
- void *&CurVal = GlobalAddress[(const GlobalValue*)F];
- assert(CurVal == 0 && "GlobalMapping already established!");
- CurVal = Addr;
- }
- // getPointerToGlobalIfAvailable - This returns the address of the specified
- // global value if it is available, otherwise it returns null.
- //
- void *getPointerToGlobalIfAvailable(const GlobalValue *GV) {
- std::map<const GlobalValue*, void*>::iterator I = GlobalAddress.find(GV);
- return I != GlobalAddress.end() ? I->second : 0;
- }
+ /// addGlobalMapping - Tell the execution engine that the specified global is
+ /// at the specified location. This is used internally as functions are JIT'd
+ /// and as global variables are laid out in memory. It can and should also be
+ /// used by clients of the EE that want to have an LLVM global overlay
+ /// existing data in memory.
+ void addGlobalMapping(const GlobalValue *GV, void *Addr);
+
+ /// clearAllGlobalMappings - Clear all global mappings and start over again
+ /// use in dynamic compilation scenarios when you want to move globals
+ void clearAllGlobalMappings();
+
+ /// updateGlobalMapping - Replace an existing mapping for GV with a new
+ /// address. This updates both maps as required. If "Addr" is null, the
+ /// entry for the global is removed from the mappings.
+ void updateGlobalMapping(const GlobalValue *GV, void *Addr);
+
+ /// getPointerToGlobalIfAvailable - This returns the address of the specified
+ /// global value if it is has already been codegen'd, otherwise it returns
+ /// null.
+ ///
+ void *getPointerToGlobalIfAvailable(const GlobalValue *GV);
- // getPointerToGlobal - This returns the address of the specified global
- // value. This may involve code generation if it's a function.
- //
+ /// getPointerToGlobal - This returns the address of the specified global
+ /// value. This may involve code generation if it's a function.
+ ///
void *getPointerToGlobal(const GlobalValue *GV);
- // getPointerToFunction - The different EE's represent function bodies in
- // different ways. They should each implement this to say what a function
- // pointer should look like.
- //
+ /// getPointerToFunction - The different EE's represent function bodies in
+ /// different ways. They should each implement this to say what a function
+ /// pointer should look like.
+ ///
virtual void *getPointerToFunction(Function *F) = 0;
- void StoreValueToMemory(GenericValue Val, GenericValue *Ptr, const Type *Ty);
+ /// 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.
+ ///
+ virtual void *getPointerToFunctionOrStub(Function *F) {
+ // Default implementation, just codegen the function.
+ return getPointerToFunction(F);
+ }
+
+ /// getGlobalValueAtAddress - Return the LLVM global value object that starts
+ /// at the specified address.
+ ///
+ const GlobalValue *getGlobalValueAtAddress(void *Addr);
+
+
+ void StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr, const Type *Ty);
void InitializeMemory(const Constant *Init, void *Addr);
+ /// 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 VM::getPointerToFunction().
+ ///
+ virtual void *recompileAndRelinkFunction(Function *F) = 0;
+
+ /// freeMachineCodeForFunction - Release memory in the ExecutionEngine
+ /// corresponding to the machine code emitted to execute this function, useful
+ /// for garbage-collecting generated code.
+ ///
+ virtual void freeMachineCodeForFunction(Function *F) = 0;
+
+ /// getOrEmitGlobalVariable - Return the address of the specified global
+ /// variable, possibly emitting it to memory if needed. This is used by the
+ /// Emitter.
+ virtual void *getOrEmitGlobalVariable(const GlobalVariable *GV) {
+ return getPointerToGlobal((GlobalValue*)GV);
+ }
+
+ /// DisableLazyCompilation - If called, the JIT will abort if lazy compilation
+ // is ever attempted.
+ void DisableLazyCompilation() {
+ LazyCompilationDisabled = true;
+ }
+ bool isLazyCompilationDisabled() const {
+ return LazyCompilationDisabled;
+ }
+
protected:
void emitGlobals();
+
+ // EmitGlobalVariable - This method emits the specified global variable to the
+ // address specified in GlobalAddresses, or allocates new memory if it's not
+ // already in the map.
+ void EmitGlobalVariable(const GlobalVariable *GV);
+
GenericValue getConstantValue(const Constant *C);
- GenericValue LoadValueFromMemory(GenericValue *Ptr, const Type *Ty);
+ void LoadValueFromMemory(GenericValue &Result, GenericValue *Ptr,
+ const Type *Ty);
};
+} // End llvm namespace
+
#endif
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