llvm-6502/include/llvm/ExecutionEngine/ExecutionEngine.h
2009-07-18 00:42:18 +00:00

473 lines
18 KiB
C++

//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- 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 abstract interface that implements execution support
// for LLVM.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTION_ENGINE_H
#define LLVM_EXECUTION_ENGINE_H
#include <vector>
#include <map>
#include <string>
#include "llvm/ADT/SmallVector.h"
#include "llvm/System/Mutex.h"
#include "llvm/Target/TargetMachine.h"
namespace llvm {
struct GenericValue;
class Constant;
class Function;
class GlobalVariable;
class GlobalValue;
class JITEventListener;
class JITMemoryManager;
class MachineCodeInfo;
class Module;
class ModuleProvider;
class MutexGuard;
class TargetData;
class Type;
class ExecutionEngineState {
private:
/// GlobalAddressMap - A mapping between LLVM global values and their
/// actualized version...
std::map<const GlobalValue*, void *> GlobalAddressMap;
/// 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;
public:
std::map<const GlobalValue*, void *> &
getGlobalAddressMap(const MutexGuard &) {
return GlobalAddressMap;
}
std::map<void*, const GlobalValue*> &
getGlobalAddressReverseMap(const MutexGuard &) {
return GlobalAddressReverseMap;
}
};
class ExecutionEngine {
const TargetData *TD;
ExecutionEngineState state;
bool LazyCompilationDisabled;
bool GVCompilationDisabled;
bool SymbolSearchingDisabled;
bool DlsymStubsEnabled;
friend class EngineBuilder; // To allow access to JITCtor and InterpCtor.
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;
}
/// getMemoryforGV - Allocate memory for a global variable.
virtual char* getMemoryForGV(const GlobalVariable* GV);
// 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.
static ExecutionEngine *(*JITCtor)(ModuleProvider *MP,
std::string *ErrorStr,
JITMemoryManager *JMM,
CodeGenOpt::Level OptLevel,
bool GVsWithCode);
static ExecutionEngine *(*InterpCtor)(ModuleProvider *MP,
std::string *ErrorStr);
/// LazyFunctionCreator - If an unknown function is needed, this function
/// pointer is invoked to create it. If this returns null, the JIT will abort.
void* (*LazyFunctionCreator)(const std::string &);
/// ExceptionTableRegister - If Exception Handling is set, the JIT will
/// register dwarf tables with this function
typedef void (*EERegisterFn)(void*);
static EERegisterFn ExceptionTableRegister;
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 Startup
//===--------------------------------------------------------------------===//
virtual ~ExecutionEngine();
/// create - This is the factory method for creating an execution engine which
/// is appropriate for the current machine. This takes ownership of the
/// module provider.
static ExecutionEngine *create(ModuleProvider *MP,
bool ForceInterpreter = false,
std::string *ErrorStr = 0,
CodeGenOpt::Level OptLevel =
CodeGenOpt::Default,
// Allocating globals with code breaks
// freeMachineCodeForFunction and is probably
// unsafe and bad for performance. However,
// we have clients who depend on this
// behavior, so we must support it.
// Eventually, when we're willing to break
// some backwards compatability, this flag
// should be flipped to false, so that by
// default freeMachineCodeForFunction works.
bool GVsWithCode = true);
/// create - This is the factory method for creating an execution engine which
/// is appropriate for the current machine. This takes ownership of the
/// module.
static ExecutionEngine *create(Module *M);
/// createJIT - This is the factory method for creating a JIT for the current
/// machine, it does not fall back to the interpreter. This takes ownership
/// of the ModuleProvider and JITMemoryManager if successful.
///
/// Clients should make sure to initialize targets prior to calling this
/// function.
static ExecutionEngine *createJIT(ModuleProvider *MP,
std::string *ErrorStr = 0,
JITMemoryManager *JMM = 0,
CodeGenOpt::Level OptLevel =
CodeGenOpt::Default,
bool GVsWithCode = true);
/// 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.
virtual void addModuleProvider(ModuleProvider *P) {
Modules.push_back(P);
}
//===----------------------------------------------------------------------===//
const TargetData *getTargetData() const { return TD; }
/// removeModuleProvider - Remove a ModuleProvider from the list of modules.
/// Relases the Module from the ModuleProvider, materializing it in the
/// process, and returns the materialized Module.
virtual Module* removeModuleProvider(ModuleProvider *P,
std::string *ErrInfo = 0);
/// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
/// and deletes the ModuleProvider and owned Module. Avoids materializing
/// the underlying module.
virtual void deleteModuleProvider(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);
/// runFunction - Execute the specified function with the specified arguments,
/// and return the result.
///
virtual GenericValue runFunction(Function *F,
const std::vector<GenericValue> &ArgValues) = 0;
/// runStaticConstructorsDestructors - This method is used to execute all of
/// the static constructors or destructors for a program, depending on the
/// value of isDtors.
void runStaticConstructorsDestructors(bool isDtors);
/// 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(Module *module, 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);
/// 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. After adding a mapping for GV, you must not
/// destroy it until you've removed the mapping.
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();
/// clearGlobalMappingsFromModule - Clear all global mappings that came from a
/// particular module, because it has been removed from the JIT.
void clearGlobalMappingsFromModule(Module *M);
/// 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. This returns the old
/// value of the pointer, or null if it was not in the map.
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. After
/// getting a pointer to GV, it and all globals it transitively refers to have
/// been passed to addGlobalMapping. You must clear the mapping for each
/// referred-to global before destroying it. If a referred-to global RTG is a
/// function and this ExecutionEngine is a JIT compiler, calling
/// updateGlobalMapping(RTG, 0) will leak the function's machine code, so you
/// should call freeMachineCodeForFunction(RTG) instead. Note that
/// optimizations can move and delete non-external GlobalValues without
/// notifying the ExecutionEngine.
///
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. See getPointerToGlobal for the requirements on
/// destroying F and any GlobalValues it refers to.
///
virtual void *getPointerToFunction(Function *F) = 0;
/// 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. See getPointerToGlobal
/// for the requirements on destroying F and any GlobalValues it refers to.
///
virtual void *getPointerToFunctionOrStub(Function *F) {
// Default implementation, just codegen the function.
return getPointerToFunction(F);
}
// The JIT overrides a version that actually does this.
virtual void runJITOnFunction(Function *, MachineCodeInfo * = 0) { }
/// 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. See getPointerToGlobal for the requirements on destroying GV and
/// any GlobalValues it refers to.
virtual void *getOrEmitGlobalVariable(const GlobalVariable *GV) {
return getPointerToGlobal((GlobalValue*)GV);
}
/// Registers a listener to be called back on various events within
/// the JIT. See JITEventListener.h for more details. Does not
/// take ownership of the argument. The argument may be NULL, in
/// which case these functions do nothing.
virtual void RegisterJITEventListener(JITEventListener *) {}
virtual void UnregisterJITEventListener(JITEventListener *) {}
/// DisableLazyCompilation - If called, the JIT will abort if lazy compilation
/// is ever attempted.
void DisableLazyCompilation(bool Disabled = true) {
LazyCompilationDisabled = Disabled;
}
bool isLazyCompilationDisabled() const {
return LazyCompilationDisabled;
}
/// DisableGVCompilation - If called, the JIT will abort if it's asked to
/// allocate space and populate a GlobalVariable that is not internal to
/// the module.
void DisableGVCompilation(bool Disabled = true) {
GVCompilationDisabled = Disabled;
}
bool isGVCompilationDisabled() const {
return GVCompilationDisabled;
}
/// DisableSymbolSearching - If called, the JIT will not try to lookup unknown
/// symbols with dlsym. A client can still use InstallLazyFunctionCreator to
/// resolve symbols in a custom way.
void DisableSymbolSearching(bool Disabled = true) {
SymbolSearchingDisabled = Disabled;
}
bool isSymbolSearchingDisabled() const {
return SymbolSearchingDisabled;
}
/// EnableDlsymStubs -
void EnableDlsymStubs(bool Enabled = true) {
DlsymStubsEnabled = Enabled;
}
bool areDlsymStubsEnabled() const {
return DlsymStubsEnabled;
}
/// InstallLazyFunctionCreator - If an unknown function is needed, the
/// specified function pointer is invoked to create it. If it returns null,
/// the JIT will abort.
void InstallLazyFunctionCreator(void* (*P)(const std::string &)) {
LazyFunctionCreator = P;
}
/// InstallExceptionTableRegister - The JIT will use the given function
/// to register the exception tables it generates.
static void InstallExceptionTableRegister(void (*F)(void*)) {
ExceptionTableRegister = F;
}
/// RegisterTable - Registers the given pointer as an exception table. It uses
/// the ExceptionTableRegister function.
static void RegisterTable(void* res) {
if (ExceptionTableRegister)
ExceptionTableRegister(res);
}
protected:
explicit ExecutionEngine(ModuleProvider *P);
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);
void LoadValueFromMemory(GenericValue &Result, GenericValue *Ptr,
const Type *Ty);
};
namespace EngineKind {
// These are actually bitmasks that get or-ed together.
enum Kind {
JIT = 0x1,
Interpreter = 0x2
};
const static Kind Either = (Kind)(JIT | Interpreter);
}
/// EngineBuilder - Builder class for ExecutionEngines. Use this by
/// stack-allocating a builder, chaining the various set* methods, and
/// terminating it with a .create() call.
class EngineBuilder {
private:
ModuleProvider *MP;
EngineKind::Kind WhichEngine;
std::string *ErrorStr;
CodeGenOpt::Level OptLevel;
JITMemoryManager *JMM;
bool AllocateGVsWithCode;
/// InitEngine - Does the common initialization of default options.
///
void InitEngine() {
WhichEngine = EngineKind::Either;
ErrorStr = NULL;
OptLevel = CodeGenOpt::Default;
JMM = NULL;
AllocateGVsWithCode = false;
}
public:
/// EngineBuilder - Constructor for EngineBuilder. If create() is called and
/// is successful, the created engine takes ownership of the module
/// provider.
EngineBuilder(ModuleProvider *mp) : MP(mp) {
InitEngine();
}
/// EngineBuilder - Overloaded constructor that automatically creates an
/// ExistingModuleProvider for an existing module.
EngineBuilder(Module *m);
/// setEngineKind - Controls whether the user wants the interpreter, the JIT,
/// or whichever engine works. This option defaults to EngineKind::Either.
EngineBuilder &setEngineKind(EngineKind::Kind w) {
WhichEngine = w;
return *this;
}
/// setJITMemoryManager - Sets the memory manager to use. This allows
/// clients to customize their memory allocation policies. If create() is
/// called and is successful, the created engine takes ownership of the
/// memory manager. This option defaults to NULL.
EngineBuilder &setJITMemoryManager(JITMemoryManager *jmm) {
JMM = jmm;
return *this;
}
/// setErrorStr - Set the error string to write to on error. This option
/// defaults to NULL.
EngineBuilder &setErrorStr(std::string *e) {
ErrorStr = e;
return *this;
}
/// setOptLevel - Set the optimization level for the JIT. This option
/// defaults to CodeGenOpt::Default.
EngineBuilder &setOptLevel(CodeGenOpt::Level l) {
OptLevel = l;
return *this;
}
/// setAllocateGVsWithCode - Sets whether global values should be allocated
/// into the same buffer as code. For most applications this should be set
/// to false. Allocating globals with code breaks freeMachineCodeForFunction
/// and is probably unsafe and bad for performance. However, we have clients
/// who depend on this behavior, so we must support it. This option defaults
/// to false so that users of the new API can safely use the new memory
/// manager and free machine code.
EngineBuilder &setAllocateGVsWithCode(bool a) {
AllocateGVsWithCode = a;
return *this;
}
ExecutionEngine *create();
};
} // End llvm namespace
#endif