#include <map>
#include <string>
#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/ValueMap.h"
#include "llvm/Support/ValueHandle.h"
#include "llvm/System/Mutex.h"
class TargetData;
class Type;
+/// \brief Helper class for helping synchronize access to the global address map
+/// table.
class ExecutionEngineState {
public:
struct AddressMapConfig : public ValueMapConfig<const GlobalValue*> {
public:
ExecutionEngineState(ExecutionEngine &EE);
- GlobalAddressMapTy &
- getGlobalAddressMap(const MutexGuard &) {
+ GlobalAddressMapTy &getGlobalAddressMap(const MutexGuard &) {
return GlobalAddressMap;
}
return GlobalAddressReverseMap;
}
- // Returns the address ToUnmap was mapped to.
+ /// \brief Erase an entry from the mapping table.
+ ///
+ /// \returns The address that \arg ToUnmap was happed to.
void *RemoveMapping(const MutexGuard &, const GlobalValue *ToUnmap);
};
-
+/// \brief Abstract interface for implementation execution of LLVM modules,
+/// designed to support both interpreter and just-in-time (JIT) compiler
+/// implementations.
class ExecutionEngine {
- const TargetData *TD;
+ /// The state object holding the global address mapping, which must be
+ /// accessed synchronously.
+ //
+ // FIXME: There is no particular need the entire map needs to be
+ // synchronized. Wouldn't a reader-writer design be better here?
ExecutionEngineState EEState;
+
+ /// The target data for the platform for which execution is being performed.
+ const TargetData *TD;
+
+ /// Whether lazy JIT compilation is enabled.
bool CompilingLazily;
+
+ /// Whether JIT compilation of external global variables is allowed.
bool GVCompilationDisabled;
+
+ /// Whether the JIT should perform lookups of external symbols (e.g.,
+ /// using dlsym).
bool SymbolSearchingDisabled;
friend class EngineBuilder; // To allow access to JITCtor and InterpCtor.
protected:
- /// Modules - This is a list of Modules that we are JIT'ing from. We use a
- /// smallvector to optimize for the case where there is only one module.
+ /// The list of Modules that we are JIT'ing from. We use a SmallVector to
+ /// optimize for the case where there is only one module.
SmallVector<Module*, 1> Modules;
void setTargetData(const TargetData *td) {
}
/// getMemoryforGV - Allocate memory for a global variable.
- virtual char* getMemoryForGV(const GlobalVariable* GV);
+ 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)(Module *M,
- std::string *ErrorStr,
- JITMemoryManager *JMM,
- CodeGenOpt::Level OptLevel,
- bool GVsWithCode,
- CodeModel::Model CMM);
+ // libraries, the execution engine implementations set these functions to ctor
+ // pointers at startup time if they are linked in.
+ static ExecutionEngine *(*JITCtor)(
+ Module *M,
+ std::string *ErrorStr,
+ JITMemoryManager *JMM,
+ CodeGenOpt::Level OptLevel,
+ bool GVsWithCode,
+ CodeModel::Model CMM,
+ StringRef MArch,
+ StringRef MCPU,
+ const SmallVectorImpl<std::string>& MAttrs);
+ static ExecutionEngine *(*MCJITCtor)(
+ Module *M,
+ std::string *ErrorStr,
+ JITMemoryManager *JMM,
+ CodeGenOpt::Level OptLevel,
+ bool GVsWithCode,
+ CodeModel::Model CMM,
+ StringRef MArch,
+ StringRef MCPU,
+ const SmallVectorImpl<std::string>& MAttrs);
static ExecutionEngine *(*InterpCtor)(Module *M,
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 &);
+ /// 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
+ /// ExceptionTableRegister - If Exception Handling is set, the JIT will
+ /// register dwarf tables with this function.
typedef void (*EERegisterFn)(void*);
- static EERegisterFn ExceptionTableRegister;
+ EERegisterFn ExceptionTableRegister;
+ EERegisterFn ExceptionTableDeregister;
+ std::vector<void*> AllExceptionTables;
public:
- /// lock - This lock is protects the ExecutionEngine, JIT, JITResolver and
+ /// lock - This lock 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
+ sys::Mutex lock;
//===--------------------------------------------------------------------===//
// ExecutionEngine Startup
/// create - This is the factory method for creating an execution engine which
/// is appropriate for the current machine. This takes ownership of the
/// module.
+ ///
+ /// \param GVsWithCode - 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.
static ExecutionEngine *create(Module *M,
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 Module and JITMemoryManager if successful.
CodeGenOpt::Level OptLevel =
CodeGenOpt::Default,
bool GVsWithCode = true,
- CodeModel::Model CMM =
- CodeModel::Default);
+ CodeModel::Model CMM =
+ CodeModel::Default);
/// addModule - Add a Module to the list of modules that we can JIT from.
/// Note that this takes ownership of the Module: when the ExecutionEngine is
Modules.push_back(M);
}
- //===----------------------------------------------------------------------===//
+ //===--------------------------------------------------------------------===//
const TargetData *getTargetData() const { return TD; }
-
/// removeModule - Remove a Module from the list of modules. Returns true if
/// M is found.
virtual bool removeModule(Module *M);
/// 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.
+ /// the static constructors or destructors for a program.
+ ///
+ /// \param isDtors - Run the destructors instead of constructors.
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.
+ /// the static constructors or destructors for a particular module.
+ ///
+ /// \param isDtors - Run the destructors instead of constructors.
void runStaticConstructorsDestructors(Module *module, bool isDtors);
/// GlobalValue is destroyed.
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
+ /// clearAllGlobalMappings - Clear all global mappings and start over again,
+ /// for use in dynamic compilation scenarios to move globals.
void clearAllGlobalMappings();
/// clearGlobalMappingsFromModule - Clear all global mappings that came from a
/// 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.
- ///
+ /// 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
/// pointer should look like. When F is destroyed, the ExecutionEngine will
/// remove its global mapping and free any machine code. Be sure no threads
/// are running inside F when that happens.
- ///
virtual void *getPointerToFunction(Function *F) = 0;
/// getPointerToBasicBlock - The different EE's represent basic blocks in
/// different ways. Return the representation for a blockaddress of the
/// specified block.
- ///
virtual void *getPointerToBasicBlock(BasicBlock *BB) = 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
/// getPointerToFunction for the requirements on destroying F.
- ///
virtual void *getPointerToFunctionOrStub(Function *F) {
// Default implementation, just codegen the function.
return getPointerToFunction(F);
///
const GlobalValue *getGlobalValueAtAddress(void *Addr);
-
+ /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr.
+ /// Ptr is the address of the memory at which to store Val, cast to
+ /// GenericValue *. It is not a pointer to a GenericValue containing the
+ /// address at which to store Val.
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().
- ///
+ /// 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
/// InstallExceptionTableRegister - The JIT will use the given function
/// to register the exception tables it generates.
- static void InstallExceptionTableRegister(void (*F)(void*)) {
+ void InstallExceptionTableRegister(EERegisterFn F) {
ExceptionTableRegister = F;
}
+ void InstallExceptionTableDeregister(EERegisterFn F) {
+ ExceptionTableDeregister = F;
+ }
- /// RegisterTable - Registers the given pointer as an exception table. It uses
- /// the ExceptionTableRegister function.
- static void RegisterTable(void* res) {
- if (ExceptionTableRegister)
+ /// RegisterTable - Registers the given pointer as an exception table. It
+ /// uses the ExceptionTableRegister function.
+ void RegisterTable(void* res) {
+ if (ExceptionTableRegister) {
ExceptionTableRegister(res);
+ AllExceptionTables.push_back(res);
+ }
}
+ /// DeregisterAllTables - Deregisters all previously registered pointers to an
+ /// exception tables. It uses the ExceptionTableoDeregister function.
+ void DeregisterAllTables();
+
protected:
explicit ExecutionEngine(Module *M);
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);
/// stack-allocating a builder, chaining the various set* methods, and
/// terminating it with a .create() call.
class EngineBuilder {
-
- private:
+private:
Module *M;
EngineKind::Kind WhichEngine;
std::string *ErrorStr;
JITMemoryManager *JMM;
bool AllocateGVsWithCode;
CodeModel::Model CMModel;
+ std::string MArch;
+ std::string MCPU;
+ SmallVector<std::string, 4> MAttrs;
+ bool UseMCJIT;
/// InitEngine - Does the common initialization of default options.
- ///
void InitEngine() {
WhichEngine = EngineKind::Either;
ErrorStr = NULL;
JMM = NULL;
AllocateGVsWithCode = false;
CMModel = CodeModel::Default;
+ UseMCJIT = false;
}
- public:
+public:
/// EngineBuilder - Constructor for EngineBuilder. If create() is called and
/// is successful, the created engine takes ownership of the module.
EngineBuilder(Module *m) : M(m) {
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();
};
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