#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/MutexGuard.h"
#include "llvm/System/DynamicLibrary.h"
#include "llvm/Target/TargetData.h"
#include <iostream>
ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
-ExecutionEngine::ExecutionEngine(ModuleProvider *P) :
- CurMod(*P->getModule()), MP(P) {
+ExecutionEngine::ExecutionEngine(ModuleProvider *P) {
+ LazyCompilationDisabled = false;
+ Modules.push_back(P);
assert(P && "ModuleProvider is null?");
}
-ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
+ExecutionEngine::ExecutionEngine(Module *M) {
+ LazyCompilationDisabled = false;
assert(M && "Module is null?");
+ Modules.push_back(new ExistingModuleProvider(M));
}
ExecutionEngine::~ExecutionEngine() {
- delete MP;
+ for (unsigned i = 0, e = Modules.size(); i != e; ++i)
+ delete Modules[i];
+}
+
+/// 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 *ExecutionEngine::FindFunctionNamed(const char *FnName) {
+ for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
+ if (Function *F = Modules[i]->getModule()->getNamedFunction(FnName))
+ return F;
+ }
+ return 0;
+}
+
+
+/// 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 ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
+ MutexGuard locked(lock);
+
+ void *&CurVal = state.getGlobalAddressMap(locked)[GV];
+ assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
+ CurVal = Addr;
+
+ // If we are using the reverse mapping, add it too
+ if (!state.getGlobalAddressReverseMap(locked).empty()) {
+ const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
+ assert((V == 0 || GV == 0) && "GlobalMapping already established!");
+ V = GV;
+ }
+}
+
+/// clearAllGlobalMappings - Clear all global mappings and start over again
+/// use in dynamic compilation scenarios when you want to move globals
+void ExecutionEngine::clearAllGlobalMappings() {
+ MutexGuard locked(lock);
+
+ state.getGlobalAddressMap(locked).clear();
+ state.getGlobalAddressReverseMap(locked).clear();
+}
+
+/// 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 ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
+ MutexGuard locked(lock);
+
+ // Deleting from the mapping?
+ if (Addr == 0) {
+ state.getGlobalAddressMap(locked).erase(GV);
+ if (!state.getGlobalAddressReverseMap(locked).empty())
+ state.getGlobalAddressReverseMap(locked).erase(Addr);
+ return;
+ }
+
+ void *&CurVal = state.getGlobalAddressMap(locked)[GV];
+ if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
+ state.getGlobalAddressReverseMap(locked).erase(CurVal);
+ CurVal = Addr;
+
+ // If we are using the reverse mapping, add it too
+ if (!state.getGlobalAddressReverseMap(locked).empty()) {
+ const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
+ assert((V == 0 || GV == 0) && "GlobalMapping already established!");
+ V = GV;
+ }
+}
+
+/// getPointerToGlobalIfAvailable - This returns the address of the specified
+/// global value if it is has already been codegen'd, otherwise it returns null.
+///
+void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
+ MutexGuard locked(lock);
+
+ std::map<const GlobalValue*, void*>::iterator I =
+ state.getGlobalAddressMap(locked).find(GV);
+ return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
}
/// getGlobalValueAtAddress - Return the LLVM global value object that starts
// If we haven't computed the reverse mapping yet, do so first.
if (state.getGlobalAddressReverseMap(locked).empty()) {
- for (std::map<const GlobalValue*, void *>::iterator I =
- state.getGlobalAddressMap(locked).begin(), E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
- state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second, I->first));
+ for (std::map<const GlobalValue*, void *>::iterator
+ I = state.getGlobalAddressMap(locked).begin(),
+ E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
+ state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
+ I->first));
}
std::map<void *, const GlobalValue*>::iterator I =
//
static void *CreateArgv(ExecutionEngine *EE,
const std::vector<std::string> &InputArgv) {
- unsigned PtrSize = EE->getTargetData().getPointerSize();
+ unsigned PtrSize = EE->getTargetData()->getPointerSize();
char *Result = new char[(InputArgv.size()+1)*PtrSize];
DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
/// runStaticConstructorsDestructors - This method is used to execute all of
-/// the static constructors or destructors for a module, depending on the
+/// the static constructors or destructors for a program, depending on the
/// value of isDtors.
void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
- GlobalVariable *GV = CurMod.getNamedGlobal(Name);
-
- // If this global has internal linkage, or if it has a use, then it must be
- // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
- // this is the case, don't execute any of the global ctors, __main will do it.
- if (!GV || GV->isExternal() || GV->hasInternalLinkage()) return;
- // Should be an array of '{ int, void ()* }' structs. The first value is the
- // init priority, which we ignore.
- ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
- if (!InitList) return;
- for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
- if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
- if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
+ // Execute global ctors/dtors for each module in the program.
+ for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
+ GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
+
+ // If this global has internal linkage, or if it has a use, then it must be
+ // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
+ // this is the case, don't execute any of the global ctors, __main will do
+ // it.
+ if (!GV || GV->isExternal() || GV->hasInternalLinkage()) continue;
+
+ // Should be an array of '{ int, void ()* }' structs. The first value is
+ // the init priority, which we ignore.
+ ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
+ if (!InitList) continue;
+ for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
+ if (ConstantStruct *CS =
+ dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
+ if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
- Constant *FP = CS->getOperand(1);
- if (FP->isNullValue())
- return; // Found a null terminator, exit.
+ Constant *FP = CS->getOperand(1);
+ if (FP->isNullValue())
+ break; // Found a null terminator, exit.
- if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
- if (CE->getOpcode() == Instruction::Cast)
- FP = CE->getOperand(0);
- if (Function *F = dyn_cast<Function>(FP)) {
- // Execute the ctor/dtor function!
- runFunction(F, std::vector<GenericValue>());
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
+ if (CE->getOpcode() == Instruction::Cast)
+ FP = CE->getOperand(0);
+ if (Function *F = dyn_cast<Function>(FP)) {
+ // Execute the ctor/dtor function!
+ runFunction(F, std::vector<GenericValue>());
+ }
}
- }
+ }
}
/// runFunctionAsMain - This is a helper function which wraps runFunction to
if (EE) {
// Make sure we can resolve symbols in the program as well. The zero arg
// to the function tells DynamicLibrary to load the program, not a library.
- sys::DynamicLibrary::LoadLibraryPermanently(0);
+ try {
+ sys::DynamicLibrary::LoadLibraryPermanently(0);
+ } catch (...) {
+ }
}
return EE;
uint64_t Offset =
TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
- if (getTargetData().getPointerSize() == 4)
+ if (getTargetData()->getPointerSize() == 4)
Result.IntVal += Offset;
else
Result.LongVal += Offset;
}
switch (C->getType()->getTypeID()) {
-#define GET_CONST_VAL(TY, CTY, CLASS) \
- case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->getValue(); break
- GET_CONST_VAL(Bool , bool , ConstantBool);
- GET_CONST_VAL(UByte , unsigned char , ConstantUInt);
- GET_CONST_VAL(SByte , signed char , ConstantSInt);
- GET_CONST_VAL(UShort , unsigned short, ConstantUInt);
- GET_CONST_VAL(Short , signed short , ConstantSInt);
- GET_CONST_VAL(UInt , unsigned int , ConstantUInt);
- GET_CONST_VAL(Int , signed int , ConstantSInt);
- GET_CONST_VAL(ULong , uint64_t , ConstantUInt);
- GET_CONST_VAL(Long , int64_t , ConstantSInt);
- GET_CONST_VAL(Float , float , ConstantFP);
- GET_CONST_VAL(Double , double , ConstantFP);
+#define GET_CONST_VAL(TY, CTY, CLASS, GETMETH) \
+ case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->GETMETH(); break
+ GET_CONST_VAL(Bool , bool , ConstantBool, getValue);
+ GET_CONST_VAL(UByte , unsigned char , ConstantInt, getZExtValue);
+ GET_CONST_VAL(SByte , signed char , ConstantInt, getSExtValue);
+ GET_CONST_VAL(UShort , unsigned short, ConstantInt, getZExtValue);
+ GET_CONST_VAL(Short , signed short , ConstantInt, getSExtValue);
+ GET_CONST_VAL(UInt , unsigned int , ConstantInt, getZExtValue);
+ GET_CONST_VAL(Int , signed int , ConstantInt, getSExtValue);
+ GET_CONST_VAL(ULong , uint64_t , ConstantInt, getZExtValue);
+ GET_CONST_VAL(Long , int64_t , ConstantInt, getSExtValue);
+ GET_CONST_VAL(Float , float , ConstantFP, getValue);
+ GET_CONST_VAL(Double , double , ConstantFP, getValue);
#undef GET_CONST_VAL
case Type::PointerTyID:
if (isa<ConstantPointerNull>(C))
///
void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
const Type *Ty) {
- if (getTargetData().isLittleEndian()) {
+ if (getTargetData()->isLittleEndian()) {
switch (Ty->getTypeID()) {
case Type::BoolTyID:
case Type::UByteTyID:
Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
break;
- case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
goto Store4BytesLittleEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
break;
- case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
goto Store4BytesBigEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
const Type *Ty) {
GenericValue Result;
- if (getTargetData().isLittleEndian()) {
+ if (getTargetData()->isLittleEndian()) {
switch (Ty->getTypeID()) {
case Type::BoolTyID:
case Type::UByteTyID:
((unsigned)Ptr->Untyped[2] << 16) |
((unsigned)Ptr->Untyped[3] << 24);
break;
- case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
goto Load4BytesLittleEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
((unsigned)Ptr->Untyped[1] << 16) |
((unsigned)Ptr->Untyped[0] << 24);
break;
- case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
goto Load4BytesBigEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
return;
} else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(Init)) {
unsigned ElementSize =
- getTargetData().getTypeSize(CP->getType()->getElementType());
+ getTargetData()->getTypeSize(CP->getType()->getElementType());
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
return;
StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
return;
} else if (isa<ConstantAggregateZero>(Init)) {
- memset(Addr, 0, (size_t)getTargetData().getTypeSize(Init->getType()));
+ memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
return;
}
case Type::ArrayTyID: {
const ConstantArray *CPA = cast<ConstantArray>(Init);
unsigned ElementSize =
- getTargetData().getTypeSize(CPA->getType()->getElementType());
+ getTargetData()->getTypeSize(CPA->getType()->getElementType());
for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
return;
case Type::StructTyID: {
const ConstantStruct *CPS = cast<ConstantStruct>(Init);
const StructLayout *SL =
- getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
+ getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->MemberOffsets[i]);
return;
/// their initializers into the memory.
///
void ExecutionEngine::emitGlobals() {
- const TargetData &TD = getTargetData();
+ const TargetData *TD = getTargetData();
// Loop over all of the global variables in the program, allocating the memory
- // to hold them.
- Module &M = getModule();
- for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
- I != E; ++I)
- if (!I->isExternal()) {
- // Get the type of the global...
- const Type *Ty = I->getType()->getElementType();
-
- // Allocate some memory for it!
- unsigned Size = TD.getTypeSize(Ty);
- addGlobalMapping(I, new char[Size]);
- } else {
- // External variable reference. Try to use the dynamic loader to
- // get a pointer to it.
- if (void *SymAddr = sys::DynamicLibrary::SearchForAddressOfSymbol(
- I->getName().c_str()))
- addGlobalMapping(I, SymAddr);
- else {
- std::cerr << "Could not resolve external global address: "
- << I->getName() << "\n";
- abort();
+ // to hold them. If there is more than one module, do a prepass over globals
+ // to figure out how the different modules should link together.
+ //
+ std::map<std::pair<std::string, const Type*>,
+ const GlobalValue*> LinkedGlobalsMap;
+
+ if (Modules.size() != 1) {
+ for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
+ Module &M = *Modules[m]->getModule();
+ for (Module::const_global_iterator I = M.global_begin(),
+ E = M.global_end(); I != E; ++I) {
+ const GlobalValue *GV = I;
+ if (GV->hasInternalLinkage() || GV->isExternal() ||
+ GV->hasAppendingLinkage() || !GV->hasName())
+ continue;// Ignore external globals and globals with internal linkage.
+
+ const GlobalValue *&GVEntry =
+ LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
+
+ // If this is the first time we've seen this global, it is the canonical
+ // version.
+ if (!GVEntry) {
+ GVEntry = GV;
+ continue;
+ }
+
+ // If the existing global is strong, never replace it.
+ if (GVEntry->hasExternalLinkage() ||
+ GVEntry->hasDLLImportLinkage() ||
+ GVEntry->hasDLLExportLinkage())
+ continue;
+
+ // Otherwise, we know it's linkonce/weak, replace it if this is a strong
+ // symbol.
+ if (GV->hasExternalLinkage())
+ GVEntry = GV;
}
}
-
- // Now that all of the globals are set up in memory, loop through them all and
- // initialize their contents.
- for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
- I != E; ++I)
- if (!I->isExternal())
- EmitGlobalVariable(I);
+ }
+
+ std::vector<const GlobalValue*> NonCanonicalGlobals;
+ for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
+ Module &M = *Modules[m]->getModule();
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ // In the multi-module case, see what this global maps to.
+ if (!LinkedGlobalsMap.empty()) {
+ if (const GlobalValue *GVEntry =
+ LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
+ // If something else is the canonical global, ignore this one.
+ if (GVEntry != &*I) {
+ NonCanonicalGlobals.push_back(I);
+ continue;
+ }
+ }
+ }
+
+ if (!I->isExternal()) {
+ // Get the type of the global.
+ const Type *Ty = I->getType()->getElementType();
+
+ // Allocate some memory for it!
+ unsigned Size = TD->getTypeSize(Ty);
+ addGlobalMapping(I, new char[Size]);
+ } else {
+ // External variable reference. Try to use the dynamic loader to
+ // get a pointer to it.
+ if (void *SymAddr =
+ sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
+ addGlobalMapping(I, SymAddr);
+ else {
+ std::cerr << "Could not resolve external global address: "
+ << I->getName() << "\n";
+ abort();
+ }
+ }
+ }
+
+ // If there are multiple modules, map the non-canonical globals to their
+ // canonical location.
+ if (!NonCanonicalGlobals.empty()) {
+ for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
+ const GlobalValue *GV = NonCanonicalGlobals[i];
+ const GlobalValue *CGV =
+ LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
+ void *Ptr = getPointerToGlobalIfAvailable(CGV);
+ assert(Ptr && "Canonical global wasn't codegen'd!");
+ addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
+ }
+ }
+
+ // Now that all of the globals are set up in memory, loop through them all and
+ // initialize their contents.
+ for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ if (!I->isExternal()) {
+ if (!LinkedGlobalsMap.empty()) {
+ if (const GlobalValue *GVEntry =
+ LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
+ if (GVEntry != &*I) // Not the canonical variable.
+ continue;
+ }
+ EmitGlobalVariable(I);
+ }
+ }
+ }
}
// EmitGlobalVariable - This method emits the specified global variable to the
DEBUG(std::cerr << "Global '" << GV->getName() << "' -> " << GA << "\n");
const Type *ElTy = GV->getType()->getElementType();
- size_t GVSize = (size_t)getTargetData().getTypeSize(ElTy);
+ size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
if (GA == 0) {
// If it's not already specified, allocate memory for the global.
GA = new char[GVSize];
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