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//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
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// The LLVM Compiler Infrastructure
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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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// This file defines the common interface used by the various execution engine
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MutexGuard.h"
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#include "llvm/Support/ValueHandle.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/DynamicLibrary.h"
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#include "llvm/System/Host.h"
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#include "llvm/Target/TargetData.h"
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STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
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STATISTIC(NumGlobals , "Number of global vars initialized");
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ExecutionEngine *(*ExecutionEngine::JITCtor)(
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std::string *ErrorStr,
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JITMemoryManager *JMM,
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CodeGenOpt::Level OptLevel,
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const SmallVectorImpl<std::string>& MAttrs) = 0;
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ExecutionEngine *(*ExecutionEngine::InterpCtor)(Module *M,
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std::string *ErrorStr) = 0;
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ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
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ExecutionEngine::ExecutionEngine(Module *M)
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LazyFunctionCreator(0) {
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CompilingLazily = false;
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GVCompilationDisabled = false;
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SymbolSearchingDisabled = false;
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assert(M && "Module is null?");
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ExecutionEngine::~ExecutionEngine() {
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clearAllGlobalMappings();
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for (unsigned i = 0, e = Modules.size(); i != e; ++i)
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// This class automatically deletes the memory block when the GlobalVariable is
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class GVMemoryBlock : public CallbackVH {
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GVMemoryBlock(const GlobalVariable *GV)
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: CallbackVH(const_cast<GlobalVariable*>(GV)) {}
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// Returns the address the GlobalVariable should be written into. The
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// GVMemoryBlock object prefixes that.
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static char *Create(const GlobalVariable *GV, const TargetData& TD) {
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const Type *ElTy = GV->getType()->getElementType();
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size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
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void *RawMemory = ::operator new(
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TargetData::RoundUpAlignment(sizeof(GVMemoryBlock),
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TD.getPreferredAlignment(GV))
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new(RawMemory) GVMemoryBlock(GV);
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return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
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virtual void deleted() {
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// We allocated with operator new and with some extra memory hanging off the
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// end, so don't just delete this. I'm not sure if this is actually
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this->~GVMemoryBlock();
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::operator delete(this);
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} // anonymous namespace
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char* ExecutionEngine::getMemoryForGV(const GlobalVariable* GV) {
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return GVMemoryBlock::Create(GV, *getTargetData());
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/// removeModule - Remove a Module from the list of modules.
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bool ExecutionEngine::removeModule(Module *M) {
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for(SmallVector<Module *, 1>::iterator I = Modules.begin(),
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E = Modules.end(); I != E; ++I) {
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clearGlobalMappingsFromModule(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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Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
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for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
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if (Function *F = Modules[i]->getFunction(FnName))
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void *ExecutionEngineState::RemoveMapping(
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const MutexGuard &, const GlobalValue *ToUnmap) {
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GlobalAddressMapTy::iterator I = GlobalAddressMap.find(ToUnmap);
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if (I == GlobalAddressMap.end())
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GlobalAddressMap.erase(I);
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GlobalAddressReverseMap.erase(OldVal);
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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.
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void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
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MutexGuard locked(lock);
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DEBUG(dbgs() << "JIT: Map \'" << GV->getName()
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<< "\' to [" << Addr << "]\n";);
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void *&CurVal = EEState.getGlobalAddressMap(locked)[GV];
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assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
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// If we are using the reverse mapping, add it too
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if (!EEState.getGlobalAddressReverseMap(locked).empty()) {
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AssertingVH<const GlobalValue> &V =
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EEState.getGlobalAddressReverseMap(locked)[Addr];
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assert((V == 0 || GV == 0) && "GlobalMapping already established!");
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/// clearAllGlobalMappings - Clear all global mappings and start over again
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/// use in dynamic compilation scenarios when you want to move globals
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void ExecutionEngine::clearAllGlobalMappings() {
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MutexGuard locked(lock);
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EEState.getGlobalAddressMap(locked).clear();
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EEState.getGlobalAddressReverseMap(locked).clear();
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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 ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
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MutexGuard locked(lock);
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for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
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EEState.RemoveMapping(locked, FI);
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for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
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EEState.RemoveMapping(locked, GI);
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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.
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void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
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MutexGuard locked(lock);
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ExecutionEngineState::GlobalAddressMapTy &Map =
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EEState.getGlobalAddressMap(locked);
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// Deleting from the mapping?
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return EEState.RemoveMapping(locked, GV);
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void *&CurVal = Map[GV];
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void *OldVal = CurVal;
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if (CurVal && !EEState.getGlobalAddressReverseMap(locked).empty())
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EEState.getGlobalAddressReverseMap(locked).erase(CurVal);
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// If we are using the reverse mapping, add it too
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if (!EEState.getGlobalAddressReverseMap(locked).empty()) {
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AssertingVH<const GlobalValue> &V =
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EEState.getGlobalAddressReverseMap(locked)[Addr];
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assert((V == 0 || GV == 0) && "GlobalMapping already established!");
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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 null.
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void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
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MutexGuard locked(lock);
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ExecutionEngineState::GlobalAddressMapTy::iterator I =
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EEState.getGlobalAddressMap(locked).find(GV);
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return I != EEState.getGlobalAddressMap(locked).end() ? I->second : 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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const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
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MutexGuard locked(lock);
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// If we haven't computed the reverse mapping yet, do so first.
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if (EEState.getGlobalAddressReverseMap(locked).empty()) {
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for (ExecutionEngineState::GlobalAddressMapTy::iterator
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I = EEState.getGlobalAddressMap(locked).begin(),
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E = EEState.getGlobalAddressMap(locked).end(); I != E; ++I)
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EEState.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
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std::map<void *, AssertingVH<const GlobalValue> >::iterator I =
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EEState.getGlobalAddressReverseMap(locked).find(Addr);
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return I != EEState.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
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std::vector<char*> Values;
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ArgvArray() : Array(NULL) {}
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~ArgvArray() { clear(); }
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for (size_t I = 0, E = Values.size(); I != E; ++I) {
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/// Turn a vector of strings into a nice argv style array of pointers to null
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/// terminated strings.
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void *reset(LLVMContext &C, ExecutionEngine *EE,
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const std::vector<std::string> &InputArgv);
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} // anonymous namespace
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void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
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const std::vector<std::string> &InputArgv) {
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clear(); // Free the old contents.
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unsigned PtrSize = EE->getTargetData()->getPointerSize();
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Array = new char[(InputArgv.size()+1)*PtrSize];
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DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array << "\n");
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const Type *SBytePtr = Type::getInt8PtrTy(C);
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for (unsigned i = 0; i != InputArgv.size(); ++i) {
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unsigned Size = InputArgv[i].size()+1;
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char *Dest = new char[Size];
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Values.push_back(Dest);
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DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void*)Dest << "\n");
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std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
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// Endian safe: Array[i] = (PointerTy)Dest;
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EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Array+i*PtrSize),
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EE->StoreValueToMemory(PTOGV(0),
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(GenericValue*)(Array+InputArgv.size()*PtrSize),
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/// runStaticConstructorsDestructors - This method is used to execute all of
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/// the static constructors or destructors for a module, depending on the
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/// value of isDtors.
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void ExecutionEngine::runStaticConstructorsDestructors(Module *module,
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const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
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// Execute global ctors/dtors for each module in the program.
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GlobalVariable *GV = module->getNamedGlobal(Name);
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// If this global has internal linkage, or if it has a use, then it must be
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// an old-style (llvmgcc3) static ctor with __main linked in and in use. If
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// this is the case, don't execute any of the global ctors, __main will do
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if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
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// Should be an array of '{ int, void ()* }' structs. The first value is
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// the init priority, which we ignore.
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ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
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if (!InitList) return;
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
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if (ConstantStruct *CS =
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dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
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if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
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Constant *FP = CS->getOperand(1);
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if (FP->isNullValue())
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break; // Found a null terminator, exit.
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
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FP = CE->getOperand(0);
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if (Function *F = dyn_cast<Function>(FP)) {
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// Execute the ctor/dtor function!
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runFunction(F, std::vector<GenericValue>());
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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, depending on the
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/// value of isDtors.
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void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
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// Execute global ctors/dtors for each module in the program.
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for (unsigned m = 0, e = Modules.size(); m != e; ++m)
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runStaticConstructorsDestructors(Modules[m], isDtors);
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/// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
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static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
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unsigned PtrSize = EE->getTargetData()->getPointerSize();
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for (unsigned i = 0; i < PtrSize; ++i)
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if (*(i + (uint8_t*)Loc))
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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 ExecutionEngine::runFunctionAsMain(Function *Fn,
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const std::vector<std::string> &argv,
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const char * const * envp) {
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std::vector<GenericValue> GVArgs;
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GVArgc.IntVal = APInt(32, argv.size());
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unsigned NumArgs = Fn->getFunctionType()->getNumParams();
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const FunctionType *FTy = Fn->getFunctionType();
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const Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
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if (FTy->getParamType(2) != PPInt8Ty) {
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report_fatal_error("Invalid type for third argument of main() supplied");
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if (FTy->getParamType(1) != PPInt8Ty) {
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report_fatal_error("Invalid type for second argument of main() supplied");
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if (!FTy->getParamType(0)->isIntegerTy(32)) {
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report_fatal_error("Invalid type for first argument of main() supplied");
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if (!FTy->getReturnType()->isIntegerTy() &&
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!FTy->getReturnType()->isVoidTy()) {
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report_fatal_error("Invalid return type of main() supplied");
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report_fatal_error("Invalid number of arguments of main() supplied");
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GVArgs.push_back(GVArgc); // Arg #0 = argc.
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GVArgs.push_back(PTOGV(CArgv.reset(Fn->getContext(), this, argv)));
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assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
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"argv[0] was null after CreateArgv");
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std::vector<std::string> EnvVars;
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for (unsigned i = 0; envp[i]; ++i)
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EnvVars.push_back(envp[i]);
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GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
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return runFunction(Fn, GVArgs).IntVal.getZExtValue();
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/// If possible, create a JIT, unless the caller specifically requests an
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/// Interpreter or there's an error. If even an Interpreter cannot be created,
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/// NULL is returned.
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ExecutionEngine *ExecutionEngine::create(Module *M,
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bool ForceInterpreter,
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std::string *ErrorStr,
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CodeGenOpt::Level OptLevel,
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return EngineBuilder(M)
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.setEngineKind(ForceInterpreter
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? EngineKind::Interpreter
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.setErrorStr(ErrorStr)
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.setOptLevel(OptLevel)
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.setAllocateGVsWithCode(GVsWithCode)
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ExecutionEngine *EngineBuilder::create() {
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// Make sure we can resolve symbols in the program as well. The zero arg
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// to the function tells DynamicLibrary to load the program, not a library.
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/* CLAMAV LOCAL: allow for no dlopen */
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// if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
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// If the user specified a memory manager but didn't specify which engine to
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// create, we assume they only want the JIT, and we fail if they only want
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if (WhichEngine & EngineKind::JIT)
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WhichEngine = EngineKind::JIT;
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*ErrorStr = "Cannot create an interpreter with a memory manager.";
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// Unless the interpreter was explicitly selected or the JIT is not linked,
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if (WhichEngine & EngineKind::JIT) {
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if (ExecutionEngine::JITCtor) {
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ExecutionEngine *EE =
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ExecutionEngine::JITCtor(M, ErrorStr, JMM, OptLevel,
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AllocateGVsWithCode, CMModel,
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MArch, MCPU, MAttrs);
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// If we can't make a JIT and we didn't request one specifically, try making
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// an interpreter instead.
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if (WhichEngine & EngineKind::Interpreter) {
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if (ExecutionEngine::InterpCtor)
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return ExecutionEngine::InterpCtor(M, ErrorStr);
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*ErrorStr = "Interpreter has not been linked in.";
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if ((WhichEngine & EngineKind::JIT) && ExecutionEngine::JITCtor == 0) {
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*ErrorStr = "JIT has not been linked in.";
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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 *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
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if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
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return getPointerToFunction(F);
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MutexGuard locked(lock);
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void *p = EEState.getGlobalAddressMap(locked)[GV];
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// Global variable might have been added since interpreter started.
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if (GlobalVariable *GVar =
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const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
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EmitGlobalVariable(GVar);
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llvm_unreachable("Global hasn't had an address allocated yet!");
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return EEState.getGlobalAddressMap(locked)[GV];
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/// This function converts a Constant* into a GenericValue. The interesting
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/// part is if C is a ConstantExpr.
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/// @brief Get a GenericValue for a Constant*
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GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
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// If its undefined, return the garbage.
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if (isa<UndefValue>(C)) {
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switch (C->getType()->getTypeID()) {
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case Type::IntegerTyID:
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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case Type::PPC_FP128TyID:
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// Although the value is undefined, we still have to construct an APInt
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// with the correct bit width.
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Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
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// If the value is a ConstantExpr
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
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Constant *Op0 = CE->getOperand(0);
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switch (CE->getOpcode()) {
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case Instruction::GetElementPtr: {
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GenericValue Result = getConstantValue(Op0);
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SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
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TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
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char* tmp = (char*) Result.PointerVal;
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Result = PTOGV(tmp + Offset);
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case Instruction::Trunc: {
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GenericValue GV = getConstantValue(Op0);
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uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
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GV.IntVal = GV.IntVal.trunc(BitWidth);
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case Instruction::ZExt: {
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GenericValue GV = getConstantValue(Op0);
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uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
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GV.IntVal = GV.IntVal.zext(BitWidth);
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case Instruction::SExt: {
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GenericValue GV = getConstantValue(Op0);
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uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
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GV.IntVal = GV.IntVal.sext(BitWidth);
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case Instruction::FPTrunc: {
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GenericValue GV = getConstantValue(Op0);
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GV.FloatVal = float(GV.DoubleVal);
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case Instruction::FPExt:{
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GenericValue GV = getConstantValue(Op0);
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GV.DoubleVal = double(GV.FloatVal);
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case Instruction::UIToFP: {
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GenericValue GV = getConstantValue(Op0);
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if (CE->getType()->isFloatTy())
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GV.FloatVal = float(GV.IntVal.roundToDouble());
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else if (CE->getType()->isDoubleTy())
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GV.DoubleVal = GV.IntVal.roundToDouble();
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else if (CE->getType()->isX86_FP80Ty()) {
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const uint64_t zero[] = {0, 0};
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APFloat apf = APFloat(APInt(80, 2, zero));
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(void)apf.convertFromAPInt(GV.IntVal,
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APFloat::rmNearestTiesToEven);
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GV.IntVal = apf.bitcastToAPInt();
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case Instruction::SIToFP: {
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GenericValue GV = getConstantValue(Op0);
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if (CE->getType()->isFloatTy())
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GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
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else if (CE->getType()->isDoubleTy())
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GV.DoubleVal = GV.IntVal.signedRoundToDouble();
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else if (CE->getType()->isX86_FP80Ty()) {
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const uint64_t zero[] = { 0, 0};
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APFloat apf = APFloat(APInt(80, 2, zero));
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(void)apf.convertFromAPInt(GV.IntVal,
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APFloat::rmNearestTiesToEven);
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GV.IntVal = apf.bitcastToAPInt();
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case Instruction::FPToUI: // double->APInt conversion handles sign
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case Instruction::FPToSI: {
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GenericValue GV = getConstantValue(Op0);
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uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
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if (Op0->getType()->isFloatTy())
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GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
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else if (Op0->getType()->isDoubleTy())
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GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
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else if (Op0->getType()->isX86_FP80Ty()) {
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APFloat apf = APFloat(GV.IntVal);
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(void)apf.convertToInteger(&v, BitWidth,
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CE->getOpcode()==Instruction::FPToSI,
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APFloat::rmTowardZero, &ignored);
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GV.IntVal = v; // endian?
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case Instruction::PtrToInt: {
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GenericValue GV = getConstantValue(Op0);
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uint32_t PtrWidth = TD->getPointerSizeInBits();
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GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
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case Instruction::IntToPtr: {
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GenericValue GV = getConstantValue(Op0);
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uint32_t PtrWidth = TD->getPointerSizeInBits();
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if (PtrWidth != GV.IntVal.getBitWidth())
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GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
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assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
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GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
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case Instruction::BitCast: {
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GenericValue GV = getConstantValue(Op0);
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const Type* DestTy = CE->getType();
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switch (Op0->getType()->getTypeID()) {
652
default: llvm_unreachable("Invalid bitcast operand");
653
case Type::IntegerTyID:
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assert(DestTy->isFloatingPointTy() && "invalid bitcast");
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if (DestTy->isFloatTy())
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GV.FloatVal = GV.IntVal.bitsToFloat();
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else if (DestTy->isDoubleTy())
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GV.DoubleVal = GV.IntVal.bitsToDouble();
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case Type::FloatTyID:
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assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
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GV.IntVal.floatToBits(GV.FloatVal);
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case Type::DoubleTyID:
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assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
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GV.IntVal.doubleToBits(GV.DoubleVal);
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case Type::PointerTyID:
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assert(DestTy->isPointerTy() && "Invalid bitcast");
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break; // getConstantValue(Op0) above already converted it
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case Instruction::Add:
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case Instruction::FAdd:
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case Instruction::Sub:
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case Instruction::FSub:
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case Instruction::Mul:
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case Instruction::FMul:
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case Instruction::UDiv:
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case Instruction::SDiv:
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case Instruction::URem:
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case Instruction::SRem:
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case Instruction::And:
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case Instruction::Or:
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case Instruction::Xor: {
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GenericValue LHS = getConstantValue(Op0);
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GenericValue RHS = getConstantValue(CE->getOperand(1));
690
switch (CE->getOperand(0)->getType()->getTypeID()) {
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default: llvm_unreachable("Bad add type!");
692
case Type::IntegerTyID:
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switch (CE->getOpcode()) {
694
default: llvm_unreachable("Invalid integer opcode");
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case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
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case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
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case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
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case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
699
case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
700
case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
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case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
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case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
703
case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
704
case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
707
case Type::FloatTyID:
708
switch (CE->getOpcode()) {
709
default: llvm_unreachable("Invalid float opcode");
710
case Instruction::FAdd:
711
GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
712
case Instruction::FSub:
713
GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
714
case Instruction::FMul:
715
GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
716
case Instruction::FDiv:
717
GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
718
case Instruction::FRem:
719
GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
722
case Type::DoubleTyID:
723
switch (CE->getOpcode()) {
724
default: llvm_unreachable("Invalid double opcode");
725
case Instruction::FAdd:
726
GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
727
case Instruction::FSub:
728
GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
729
case Instruction::FMul:
730
GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
731
case Instruction::FDiv:
732
GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
733
case Instruction::FRem:
734
GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
737
case Type::X86_FP80TyID:
738
case Type::PPC_FP128TyID:
739
case Type::FP128TyID: {
740
APFloat apfLHS = APFloat(LHS.IntVal);
741
switch (CE->getOpcode()) {
742
default: llvm_unreachable("Invalid long double opcode");llvm_unreachable(0);
743
case Instruction::FAdd:
744
apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
745
GV.IntVal = apfLHS.bitcastToAPInt();
747
case Instruction::FSub:
748
apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
749
GV.IntVal = apfLHS.bitcastToAPInt();
751
case Instruction::FMul:
752
apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
753
GV.IntVal = apfLHS.bitcastToAPInt();
755
case Instruction::FDiv:
756
apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
757
GV.IntVal = apfLHS.bitcastToAPInt();
759
case Instruction::FRem:
760
apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
761
GV.IntVal = apfLHS.bitcastToAPInt();
773
raw_string_ostream Msg(msg);
774
Msg << "ConstantExpr not handled: " << *CE;
775
report_fatal_error(Msg.str());
779
switch (C->getType()->getTypeID()) {
780
case Type::FloatTyID:
781
Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
783
case Type::DoubleTyID:
784
Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
786
case Type::X86_FP80TyID:
787
case Type::FP128TyID:
788
case Type::PPC_FP128TyID:
789
Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
791
case Type::IntegerTyID:
792
Result.IntVal = cast<ConstantInt>(C)->getValue();
794
case Type::PointerTyID:
795
if (isa<ConstantPointerNull>(C))
796
Result.PointerVal = 0;
797
else if (const Function *F = dyn_cast<Function>(C))
798
Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
799
else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
800
Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
801
else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C))
802
Result = PTOGV(getPointerToBasicBlock(const_cast<BasicBlock*>(
803
BA->getBasicBlock())));
805
llvm_unreachable("Unknown constant pointer type!");
809
raw_string_ostream Msg(msg);
810
Msg << "ERROR: Constant unimplemented for type: " << *C->getType();
811
report_fatal_error(Msg.str());
816
/// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
817
/// with the integer held in IntVal.
818
static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
819
unsigned StoreBytes) {
820
assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
821
uint8_t *Src = (uint8_t *)IntVal.getRawData();
823
if (sys::isLittleEndianHost())
824
// Little-endian host - the source is ordered from LSB to MSB. Order the
825
// destination from LSB to MSB: Do a straight copy.
826
memcpy(Dst, Src, StoreBytes);
828
// Big-endian host - the source is an array of 64 bit words ordered from
829
// LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
830
// from MSB to LSB: Reverse the word order, but not the bytes in a word.
831
while (StoreBytes > sizeof(uint64_t)) {
832
StoreBytes -= sizeof(uint64_t);
833
// May not be aligned so use memcpy.
834
memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
835
Src += sizeof(uint64_t);
838
memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
842
/// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
843
/// is the address of the memory at which to store Val, cast to GenericValue *.
844
/// It is not a pointer to a GenericValue containing the address at which to
846
void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
847
GenericValue *Ptr, const Type *Ty) {
848
const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
850
switch (Ty->getTypeID()) {
851
case Type::IntegerTyID:
852
StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
854
case Type::FloatTyID:
855
*((float*)Ptr) = Val.FloatVal;
857
case Type::DoubleTyID:
858
*((double*)Ptr) = Val.DoubleVal;
860
case Type::X86_FP80TyID:
861
memcpy(Ptr, Val.IntVal.getRawData(), 10);
863
case Type::PointerTyID:
864
// Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
865
if (StoreBytes != sizeof(PointerTy))
866
memset(Ptr, 0, StoreBytes);
868
*((PointerTy*)Ptr) = Val.PointerVal;
871
dbgs() << "Cannot store value of type " << *Ty << "!\n";
874
if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian())
875
// Host and target are different endian - reverse the stored bytes.
876
std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
879
/// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
880
/// from Src into IntVal, which is assumed to be wide enough and to hold zero.
881
static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
882
assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
883
uint8_t *Dst = (uint8_t *)IntVal.getRawData();
885
if (sys::isLittleEndianHost())
886
// Little-endian host - the destination must be ordered from LSB to MSB.
887
// The source is ordered from LSB to MSB: Do a straight copy.
888
memcpy(Dst, Src, LoadBytes);
890
// Big-endian - the destination is an array of 64 bit words ordered from
891
// LSW to MSW. Each word must be ordered from MSB to LSB. The source is
892
// ordered from MSB to LSB: Reverse the word order, but not the bytes in
894
while (LoadBytes > sizeof(uint64_t)) {
895
LoadBytes -= sizeof(uint64_t);
896
// May not be aligned so use memcpy.
897
memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
898
Dst += sizeof(uint64_t);
901
memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
907
void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
910
const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
912
switch (Ty->getTypeID()) {
913
case Type::IntegerTyID:
914
// An APInt with all words initially zero.
915
Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
916
LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
918
case Type::FloatTyID:
919
Result.FloatVal = *((float*)Ptr);
921
case Type::DoubleTyID:
922
Result.DoubleVal = *((double*)Ptr);
924
case Type::PointerTyID:
925
Result.PointerVal = *((PointerTy*)Ptr);
927
case Type::X86_FP80TyID: {
928
// This is endian dependent, but it will only work on x86 anyway.
929
// FIXME: Will not trap if loading a signaling NaN.
932
Result.IntVal = APInt(80, 2, y);
937
raw_string_ostream Msg(msg);
938
Msg << "Cannot load value of type " << *Ty << "!";
939
report_fatal_error(Msg.str());
943
// InitializeMemory - Recursive function to apply a Constant value into the
944
// specified memory location...
946
void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
947
DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
949
if (isa<UndefValue>(Init)) {
951
} else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
952
unsigned ElementSize =
953
getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
954
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
955
InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
957
} else if (isa<ConstantAggregateZero>(Init)) {
958
memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
960
} else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
961
unsigned ElementSize =
962
getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
963
for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
964
InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
966
} else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
967
const StructLayout *SL =
968
getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
969
for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
970
InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
972
} else if (Init->getType()->isFirstClassType()) {
973
GenericValue Val = getConstantValue(Init);
974
StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
978
dbgs() << "Bad Type: " << *Init->getType() << "\n";
979
llvm_unreachable("Unknown constant type to initialize memory with!");
982
/// EmitGlobals - Emit all of the global variables to memory, storing their
983
/// addresses into GlobalAddress. This must make sure to copy the contents of
984
/// their initializers into the memory.
986
void ExecutionEngine::emitGlobals() {
988
// Loop over all of the global variables in the program, allocating the memory
989
// to hold them. If there is more than one module, do a prepass over globals
990
// to figure out how the different modules should link together.
992
std::map<std::pair<std::string, const Type*>,
993
const GlobalValue*> LinkedGlobalsMap;
995
if (Modules.size() != 1) {
996
for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
997
Module &M = *Modules[m];
998
for (Module::const_global_iterator I = M.global_begin(),
999
E = M.global_end(); I != E; ++I) {
1000
const GlobalValue *GV = I;
1001
if (GV->hasLocalLinkage() || GV->isDeclaration() ||
1002
GV->hasAppendingLinkage() || !GV->hasName())
1003
continue;// Ignore external globals and globals with internal linkage.
1005
const GlobalValue *&GVEntry =
1006
LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1008
// If this is the first time we've seen this global, it is the canonical
1015
// If the existing global is strong, never replace it.
1016
if (GVEntry->hasExternalLinkage() ||
1017
GVEntry->hasDLLImportLinkage() ||
1018
GVEntry->hasDLLExportLinkage())
1021
// Otherwise, we know it's linkonce/weak, replace it if this is a strong
1022
// symbol. FIXME is this right for common?
1023
if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
1029
std::vector<const GlobalValue*> NonCanonicalGlobals;
1030
for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1031
Module &M = *Modules[m];
1032
for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1034
// In the multi-module case, see what this global maps to.
1035
if (!LinkedGlobalsMap.empty()) {
1036
if (const GlobalValue *GVEntry =
1037
LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
1038
// If something else is the canonical global, ignore this one.
1039
if (GVEntry != &*I) {
1040
NonCanonicalGlobals.push_back(I);
1046
if (!I->isDeclaration()) {
1047
addGlobalMapping(I, getMemoryForGV(I));
1049
// External variable reference. Try to use the dynamic loader to
1050
// get a pointer to it.
1052
sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName()))
1053
addGlobalMapping(I, SymAddr);
1055
report_fatal_error("Could not resolve external global address: "
1061
// If there are multiple modules, map the non-canonical globals to their
1062
// canonical location.
1063
if (!NonCanonicalGlobals.empty()) {
1064
for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1065
const GlobalValue *GV = NonCanonicalGlobals[i];
1066
const GlobalValue *CGV =
1067
LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1068
void *Ptr = getPointerToGlobalIfAvailable(CGV);
1069
assert(Ptr && "Canonical global wasn't codegen'd!");
1070
addGlobalMapping(GV, Ptr);
1074
// Now that all of the globals are set up in memory, loop through them all
1075
// and initialize their contents.
1076
for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1078
if (!I->isDeclaration()) {
1079
if (!LinkedGlobalsMap.empty()) {
1080
if (const GlobalValue *GVEntry =
1081
LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
1082
if (GVEntry != &*I) // Not the canonical variable.
1085
EmitGlobalVariable(I);
1091
// EmitGlobalVariable - This method emits the specified global variable to the
1092
// address specified in GlobalAddresses, or allocates new memory if it's not
1093
// already in the map.
1094
void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
1095
void *GA = getPointerToGlobalIfAvailable(GV);
1098
// If it's not already specified, allocate memory for the global.
1099
GA = getMemoryForGV(GV);
1100
addGlobalMapping(GV, GA);
1103
// Don't initialize if it's thread local, let the client do it.
1104
if (!GV->isThreadLocal())
1105
InitializeMemory(GV->getInitializer(), GA);
1107
const Type *ElTy = GV->getType()->getElementType();
1108
size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
1109
NumInitBytes += (unsigned)GVSize;
1113
ExecutionEngineState::ExecutionEngineState(ExecutionEngine &EE)
1114
: EE(EE), GlobalAddressMap(this) {
1117
sys::Mutex *ExecutionEngineState::AddressMapConfig::getMutex(
1118
ExecutionEngineState *EES) {
1119
return &EES->EE.lock;
1121
void ExecutionEngineState::AddressMapConfig::onDelete(
1122
ExecutionEngineState *EES, const GlobalValue *Old) {
1123
void *OldVal = EES->GlobalAddressMap.lookup(Old);
1124
EES->GlobalAddressReverseMap.erase(OldVal);
1127
void ExecutionEngineState::AddressMapConfig::onRAUW(
1128
ExecutionEngineState *, const GlobalValue *, const GlobalValue *) {
1129
assert(false && "The ExecutionEngine doesn't know how to handle a"
1130
" RAUW on a value it has a global mapping for.");