//===- 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
#include <vector>
#include <map>
#include <cassert>
+#include <string>
+#include "llvm/System/Mutex.h"
+#include "llvm/ADT/SmallVector.h"
namespace llvm {
class ModuleProvider;
class TargetData;
class Type;
-class IntrinsicLowering;
-
-class ExecutionEngine {
- Module &CurMod;
- const TargetData *TD;
+class MutexGuard;
+class ExecutionEngineState {
+private:
/// GlobalAddressMap - A mapping between LLVM global values and their
/// actualized version...
std::map<const GlobalValue*, void *> GlobalAddressMap;
/// at the address. This map is not computed unless getGlobalValueAtAddress
/// is called at some point.
std::map<void *, const GlobalValue*> GlobalAddressReverseMap;
-protected:
- ModuleProvider *MP;
- void setTargetData(const TargetData &td) {
- TD = &td;
+public:
+ std::map<const GlobalValue*, void *> &
+ getGlobalAddressMap(const MutexGuard &locked) {
+ return GlobalAddressMap;
+ }
+
+ std::map<void*, const GlobalValue*> &
+ getGlobalAddressReverseMap(const MutexGuard& locked) {
+ return GlobalAddressReverseMap;
+ }
+};
+
+
+class ExecutionEngine {
+ const TargetData *TD;
+ ExecutionEngineState state;
+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*);
+ 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();
-
- Module &getModule() const { return CurMod; }
- const TargetData &getTargetData() const { return *TD; }
+ 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);
+ }
+
+ /// 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);
+
/// create - This is the factory method for creating an execution engine which
- /// is appropriate for the current machine. If specified, the
- /// IntrinsicLowering implementation should be allocated on the heap.
- static ExecutionEngine *create(ModuleProvider *MP, bool ForceInterpreter,
- IntrinsicLowering *IL = 0);
+ /// is appropriate for the current machine.
+ static ExecutionEngine *create(ModuleProvider *MP,
+ bool ForceInterpreter = false);
/// 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 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.
const char * const * envp);
- void addGlobalMapping(const GlobalValue *GV, void *Addr) {
- void *&CurVal = GlobalAddressMap[GV];
- assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
- CurVal = Addr;
-
- // If we are using the reverse mapping, add it too
- if (!GlobalAddressReverseMap.empty()) {
- const GlobalValue *&V = GlobalAddressReverseMap[Addr];
- assert((V == 0 || GV == 0) && "GlobalMapping already established!");
- V = GV;
- }
- }
-
+ /// 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 available, otherwise it returns null.
+ /// global value if it is has already been codegen'd, otherwise it returns
+ /// null.
///
- void *getPointerToGlobalIfAvailable(const GlobalValue *GV) {
- std::map<const GlobalValue*, void*>::iterator I = GlobalAddressMap.find(GV);
- return I != GlobalAddressMap.end() ? I->second : 0;
- }
+ 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.
///
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.
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