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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8
561 lines
21 KiB
C++
561 lines
21 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 is distributed under the University of Illinois Open Source
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// 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 LLVM_EXECUTION_ENGINE_H
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#define LLVM_EXECUTION_ENGINE_H
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#include <vector>
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#include <map>
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#include <string>
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/ValueMap.h"
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#include "llvm/Support/ValueHandle.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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struct GenericValue;
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class Constant;
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class ExecutionEngine;
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class Function;
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class GlobalVariable;
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class GlobalValue;
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class JITEventListener;
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class JITMemoryManager;
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class MachineCodeInfo;
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class Module;
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class MutexGuard;
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class TargetData;
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class Type;
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/// \brief Helper class for helping synchronize access to the global address map
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/// table.
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class ExecutionEngineState {
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public:
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struct AddressMapConfig : public ValueMapConfig<const GlobalValue*> {
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typedef ExecutionEngineState *ExtraData;
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static sys::Mutex *getMutex(ExecutionEngineState *EES);
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static void onDelete(ExecutionEngineState *EES, const GlobalValue *Old);
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static void onRAUW(ExecutionEngineState *, const GlobalValue *,
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const GlobalValue *);
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};
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typedef ValueMap<const GlobalValue *, void *, AddressMapConfig>
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GlobalAddressMapTy;
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private:
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ExecutionEngine &EE;
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/// GlobalAddressMap - A mapping between LLVM global values and their
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/// actualized version...
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GlobalAddressMapTy 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 *, AssertingVH<const GlobalValue> > GlobalAddressReverseMap;
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public:
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ExecutionEngineState(ExecutionEngine &EE);
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GlobalAddressMapTy &getGlobalAddressMap(const MutexGuard &) {
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return GlobalAddressMap;
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}
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std::map<void*, AssertingVH<const GlobalValue> > &
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getGlobalAddressReverseMap(const MutexGuard &) {
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return GlobalAddressReverseMap;
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}
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/// \brief Erase an entry from the mapping table.
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///
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/// \returns The address that \arg ToUnmap was happed to.
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void *RemoveMapping(const MutexGuard &, const GlobalValue *ToUnmap);
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};
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/// \brief Abstract interface for implementation execution of LLVM modules,
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/// designed to support both interpreter and just-in-time (JIT) compiler
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/// implementations.
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class ExecutionEngine {
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/// The state object holding the global address mapping, which must be
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/// accessed synchronously.
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//
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// FIXME: There is no particular need the entire map needs to be
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// synchronized. Wouldn't a reader-writer design be better here?
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ExecutionEngineState EEState;
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/// The target data for the platform for which execution is being performed.
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const TargetData *TD;
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/// Whether lazy JIT compilation is enabled.
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bool CompilingLazily;
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/// Whether JIT compilation of external global variables is allowed.
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bool GVCompilationDisabled;
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/// Whether the JIT should perform lookups of external symbols (e.g.,
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/// using dlsym).
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bool SymbolSearchingDisabled;
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friend class EngineBuilder; // To allow access to JITCtor and InterpCtor.
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protected:
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/// The list of Modules that we are JIT'ing from. We use a SmallVector to
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/// optimize for the case where there is only one module.
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SmallVector<Module*, 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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/// getMemoryforGV - Allocate memory for a global variable.
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virtual char *getMemoryForGV(const GlobalVariable *GV);
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// To avoid having libexecutionengine depend on the JIT and interpreter
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// libraries, the execution engine implementations set these functions to ctor
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// pointers at startup time if they are linked in.
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static ExecutionEngine *(*JITCtor)(
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Module *M,
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std::string *ErrorStr,
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JITMemoryManager *JMM,
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CodeGenOpt::Level OptLevel,
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bool GVsWithCode,
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CodeModel::Model CMM,
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StringRef MArch,
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StringRef MCPU,
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const SmallVectorImpl<std::string>& MAttrs);
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static ExecutionEngine *(*MCJITCtor)(
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Module *M,
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std::string *ErrorStr,
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JITMemoryManager *JMM,
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CodeGenOpt::Level OptLevel,
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bool GVsWithCode,
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CodeModel::Model CMM,
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StringRef MArch,
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StringRef MCPU,
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const SmallVectorImpl<std::string>& MAttrs);
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static ExecutionEngine *(*InterpCtor)(Module *M,
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std::string *ErrorStr);
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/// LazyFunctionCreator - If an unknown function is needed, this function
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/// pointer is invoked to create it. If this returns null, the JIT will
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/// abort.
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void *(*LazyFunctionCreator)(const std::string &);
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/// ExceptionTableRegister - If Exception Handling is set, the JIT will
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/// register dwarf tables with this function.
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typedef void (*EERegisterFn)(void*);
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EERegisterFn ExceptionTableRegister;
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EERegisterFn ExceptionTableDeregister;
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std::vector<void*> AllExceptionTables;
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public:
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/// lock - This lock 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;
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//===--------------------------------------------------------------------===//
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// ExecutionEngine Startup
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//===--------------------------------------------------------------------===//
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virtual ~ExecutionEngine();
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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. This takes ownership of the
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/// module.
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///
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/// \param GVsWithCode - Allocating globals with code breaks
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/// freeMachineCodeForFunction and is probably unsafe and bad for performance.
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/// However, we have clients who depend on this behavior, so we must support
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/// it. Eventually, when we're willing to break some backwards compatability,
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/// this flag should be flipped to false, so that by default
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/// freeMachineCodeForFunction works.
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static ExecutionEngine *create(Module *M,
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bool ForceInterpreter = false,
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std::string *ErrorStr = 0,
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CodeGenOpt::Level OptLevel =
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CodeGenOpt::Default,
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bool GVsWithCode = true);
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/// createJIT - This is the factory method for creating a JIT for the current
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/// machine, it does not fall back to the interpreter. This takes ownership
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/// of the Module and JITMemoryManager if successful.
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///
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/// Clients should make sure to initialize targets prior to calling this
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/// function.
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static ExecutionEngine *createJIT(Module *M,
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std::string *ErrorStr = 0,
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JITMemoryManager *JMM = 0,
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CodeGenOpt::Level OptLevel =
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CodeGenOpt::Default,
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bool GVsWithCode = true,
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CodeModel::Model CMM =
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CodeModel::Default);
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/// addModule - Add a Module to the list of modules that we can JIT from.
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/// Note that this takes ownership of the Module: when the ExecutionEngine is
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/// destroyed, it destroys the Module as well.
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virtual void addModule(Module *M) {
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Modules.push_back(M);
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}
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//===--------------------------------------------------------------------===//
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const TargetData *getTargetData() const { return TD; }
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/// removeModule - Remove a Module from the list of modules. Returns true if
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/// M is found.
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virtual bool removeModule(Module *M);
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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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/// runFunction - Execute the specified function with the specified arguments,
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/// and return the result.
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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 program.
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///
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/// \param isDtors - Run the destructors instead of constructors.
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void runStaticConstructorsDestructors(bool isDtors);
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/// runStaticConstructorsDestructors - This method is used to execute all of
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/// the static constructors or destructors for a particular module.
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///
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/// \param isDtors - Run the destructors instead of constructors.
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void runStaticConstructorsDestructors(Module *module, 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. Mappings are automatically removed when their
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/// GlobalValue is destroyed.
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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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/// for use in dynamic compilation scenarios to move globals.
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void clearAllGlobalMappings();
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/// clearGlobalMappingsFromModule - Clear all global mappings that came from a
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/// particular module, because it has been removed from the JIT.
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void clearGlobalMappingsFromModule(Module *M);
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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. This returns the old
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/// value of the pointer, or null if it was not in the map.
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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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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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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. When F is destroyed, the ExecutionEngine will
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/// remove its global mapping and free any machine code. Be sure no threads
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/// are running inside F when that happens.
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virtual void *getPointerToFunction(Function *F) = 0;
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/// getPointerToBasicBlock - The different EE's represent basic blocks in
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/// different ways. Return the representation for a blockaddress of the
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/// specified block.
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virtual void *getPointerToBasicBlock(BasicBlock *BB) = 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. See
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/// getPointerToFunction for the requirements on destroying F.
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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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// The JIT overrides a version that actually does this.
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virtual void runJITOnFunction(Function *, MachineCodeInfo * = 0) { }
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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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/// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr.
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/// Ptr is the address of the memory at which to store Val, cast to
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/// GenericValue *. It is not a pointer to a GenericValue containing the
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/// address at which to store Val.
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void StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
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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 which
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/// has already been compiled to be compiled again, possibly after it has been
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/// modified. Then the entry to the old copy is overwritten with a branch to
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/// the new copy. If there was no old copy, this acts just like
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/// VM::getPointerToFunction().
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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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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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/// Registers a listener to be called back on various events within
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/// the JIT. See JITEventListener.h for more details. Does not
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/// take ownership of the argument. The argument may be NULL, in
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/// which case these functions do nothing.
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virtual void RegisterJITEventListener(JITEventListener *) {}
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virtual void UnregisterJITEventListener(JITEventListener *) {}
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/// DisableLazyCompilation - When lazy compilation is off (the default), the
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/// JIT will eagerly compile every function reachable from the argument to
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/// getPointerToFunction. If lazy compilation is turned on, the JIT will only
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/// compile the one function and emit stubs to compile the rest when they're
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/// first called. If lazy compilation is turned off again while some lazy
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/// stubs are still around, and one of those stubs is called, the program will
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/// abort.
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///
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/// In order to safely compile lazily in a threaded program, the user must
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/// ensure that 1) only one thread at a time can call any particular lazy
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/// stub, and 2) any thread modifying LLVM IR must hold the JIT's lock
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/// (ExecutionEngine::lock) or otherwise ensure that no other thread calls a
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/// lazy stub. See http://llvm.org/PR5184 for details.
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void DisableLazyCompilation(bool Disabled = true) {
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CompilingLazily = !Disabled;
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}
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bool isCompilingLazily() const {
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return CompilingLazily;
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}
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// Deprecated in favor of isCompilingLazily (to reduce double-negatives).
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// Remove this in LLVM 2.8.
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bool isLazyCompilationDisabled() const {
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return !CompilingLazily;
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}
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/// DisableGVCompilation - If called, the JIT will abort if it's asked to
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/// allocate space and populate a GlobalVariable that is not internal to
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/// the module.
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void DisableGVCompilation(bool Disabled = true) {
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GVCompilationDisabled = Disabled;
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}
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bool isGVCompilationDisabled() const {
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return GVCompilationDisabled;
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}
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/// DisableSymbolSearching - If called, the JIT will not try to lookup unknown
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/// symbols with dlsym. A client can still use InstallLazyFunctionCreator to
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/// resolve symbols in a custom way.
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void DisableSymbolSearching(bool Disabled = true) {
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SymbolSearchingDisabled = Disabled;
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}
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bool isSymbolSearchingDisabled() const {
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return SymbolSearchingDisabled;
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}
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/// InstallLazyFunctionCreator - If an unknown function is needed, the
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/// specified function pointer is invoked to create it. If it returns null,
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/// the JIT will abort.
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void InstallLazyFunctionCreator(void* (*P)(const std::string &)) {
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LazyFunctionCreator = P;
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}
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/// InstallExceptionTableRegister - The JIT will use the given function
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/// to register the exception tables it generates.
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void InstallExceptionTableRegister(EERegisterFn F) {
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ExceptionTableRegister = F;
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}
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void InstallExceptionTableDeregister(EERegisterFn F) {
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ExceptionTableDeregister = F;
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}
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/// RegisterTable - Registers the given pointer as an exception table. It
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/// uses the ExceptionTableRegister function.
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void RegisterTable(void* res) {
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if (ExceptionTableRegister) {
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ExceptionTableRegister(res);
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AllExceptionTables.push_back(res);
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}
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}
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/// DeregisterAllTables - Deregisters all previously registered pointers to an
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/// exception tables. It uses the ExceptionTableoDeregister function.
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void DeregisterAllTables();
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protected:
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explicit ExecutionEngine(Module *M);
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void emitGlobals();
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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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namespace EngineKind {
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// These are actually bitmasks that get or-ed together.
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enum Kind {
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JIT = 0x1,
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Interpreter = 0x2
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};
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const static Kind Either = (Kind)(JIT | Interpreter);
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}
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/// EngineBuilder - Builder class for ExecutionEngines. Use this by
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/// stack-allocating a builder, chaining the various set* methods, and
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/// terminating it with a .create() call.
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class EngineBuilder {
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private:
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Module *M;
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EngineKind::Kind WhichEngine;
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std::string *ErrorStr;
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CodeGenOpt::Level OptLevel;
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JITMemoryManager *JMM;
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bool AllocateGVsWithCode;
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CodeModel::Model CMModel;
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std::string MArch;
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std::string MCPU;
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SmallVector<std::string, 4> MAttrs;
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bool UseMCJIT;
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/// InitEngine - Does the common initialization of default options.
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void InitEngine() {
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WhichEngine = EngineKind::Either;
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ErrorStr = NULL;
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OptLevel = CodeGenOpt::Default;
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JMM = NULL;
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AllocateGVsWithCode = false;
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CMModel = CodeModel::Default;
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UseMCJIT = false;
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}
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public:
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/// EngineBuilder - Constructor for EngineBuilder. If create() is called and
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/// is successful, the created engine takes ownership of the module.
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EngineBuilder(Module *m) : M(m) {
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InitEngine();
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}
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/// setEngineKind - Controls whether the user wants the interpreter, the JIT,
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/// or whichever engine works. This option defaults to EngineKind::Either.
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EngineBuilder &setEngineKind(EngineKind::Kind w) {
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WhichEngine = w;
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return *this;
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}
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/// setJITMemoryManager - Sets the memory manager to use. This allows
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/// clients to customize their memory allocation policies. If create() is
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/// called and is successful, the created engine takes ownership of the
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/// memory manager. This option defaults to NULL.
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EngineBuilder &setJITMemoryManager(JITMemoryManager *jmm) {
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JMM = jmm;
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return *this;
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}
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/// setErrorStr - Set the error string to write to on error. This option
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/// defaults to NULL.
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EngineBuilder &setErrorStr(std::string *e) {
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ErrorStr = e;
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return *this;
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}
|
|
|
|
/// setOptLevel - Set the optimization level for the JIT. This option
|
|
/// defaults to CodeGenOpt::Default.
|
|
EngineBuilder &setOptLevel(CodeGenOpt::Level l) {
|
|
OptLevel = l;
|
|
return *this;
|
|
}
|
|
|
|
/// setCodeModel - Set the CodeModel that the ExecutionEngine target
|
|
/// data is using. Defaults to target specific default "CodeModel::Default".
|
|
EngineBuilder &setCodeModel(CodeModel::Model M) {
|
|
CMModel = M;
|
|
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;
|
|
}
|
|
|
|
/// setMArch - Override the architecture set by the Module's triple.
|
|
EngineBuilder &setMArch(StringRef march) {
|
|
MArch.assign(march.begin(), march.end());
|
|
return *this;
|
|
}
|
|
|
|
/// setMCPU - Target a specific cpu type.
|
|
EngineBuilder &setMCPU(StringRef mcpu) {
|
|
MCPU.assign(mcpu.begin(), mcpu.end());
|
|
return *this;
|
|
}
|
|
|
|
/// setUseMCJIT - Set whether the MC-JIT implementation should be used
|
|
/// (experimental).
|
|
void setUseMCJIT(bool Value) {
|
|
UseMCJIT = Value;
|
|
}
|
|
|
|
/// setMAttrs - Set cpu-specific attributes.
|
|
template<typename StringSequence>
|
|
EngineBuilder &setMAttrs(const StringSequence &mattrs) {
|
|
MAttrs.clear();
|
|
MAttrs.append(mattrs.begin(), mattrs.end());
|
|
return *this;
|
|
}
|
|
|
|
ExecutionEngine *create();
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|