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