path: root/lib/ExecutionEngine/ExecutionEngine.cpp

//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
//
//                     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 common interface used by the various execution engine
// subclasses.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "jit"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Constants.h"
#include "llvm/DataLayout.h"
#include "llvm/DerivedTypes.h"
#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MutexGuard.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/ValueHandle.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <cmath>
#include <cstring>
using namespace llvm;

STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
STATISTIC(NumGlobals  , "Number of global vars initialized");

ExecutionEngine *(*ExecutionEngine::JITCtor)(
  Module *M,
  std::string *ErrorStr,
  JITMemoryManager *JMM,
  bool GVsWithCode,
  TargetMachine *TM) = 0;
ExecutionEngine *(*ExecutionEngine::MCJITCtor)(
  Module *M,
  std::string *ErrorStr,
  JITMemoryManager *JMM,
  bool GVsWithCode,
  TargetMachine *TM) = 0;
ExecutionEngine *(*ExecutionEngine::InterpCtor)(Module *M,
                                                std::string *ErrorStr) = 0;

ExecutionEngine::ExecutionEngine(Module *M)
  : EEState(*this),
    LazyFunctionCreator(0),
    ExceptionTableRegister(0),
    ExceptionTableDeregister(0) {
  CompilingLazily         = false;
  GVCompilationDisabled   = false;
  SymbolSearchingDisabled = false;
  Modules.push_back(M);
  assert(M && "Module is null?");
}

ExecutionEngine::~ExecutionEngine() {
  clearAllGlobalMappings();
  for (unsigned i = 0, e = Modules.size(); i != e; ++i)
    delete Modules[i];
}

void ExecutionEngine::DeregisterAllTables() {
  if (ExceptionTableDeregister) {
    DenseMap<const Function*, void*>::iterator it = AllExceptionTables.begin();
    DenseMap<const Function*, void*>::iterator ite = AllExceptionTables.end();
    for (; it != ite; ++it)
      ExceptionTableDeregister(it->second);
    AllExceptionTables.clear();
  }
}

namespace {
/// \brief Helper class which uses a value handler to automatically deletes the
/// memory block when the GlobalVariable is destroyed.
class GVMemoryBlock : public CallbackVH {
  GVMemoryBlock(const GlobalVariable *GV)
    : CallbackVH(const_cast<GlobalVariable*>(GV)) {}

public:
  /// \brief Returns the address the GlobalVariable should be written into.  The
  /// GVMemoryBlock object prefixes that.
  static char *Create(const GlobalVariable *GV, const DataLayout& TD) {
    Type *ElTy = GV->getType()->getElementType();
    size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
    void *RawMemory =