-//===-- ExecutionEngine.cpp - Common Implementation shared by EE's --------===//
+//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
+//
+// 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 common interface used by the various execution engine
// subclasses.
//
//===----------------------------------------------------------------------===//
-#include "ExecutionEngine.h"
-#include "GenericValue.h"
-#include "llvm/DerivedTypes.h"
+#define DEBUG_TYPE "jit"
+#include "Interpreter/Interpreter.h"
+#include "JIT/JIT.h"
#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/IntrinsicLowering.h"
#include "llvm/Module.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/Target/TargetData.h"
+#include "Support/Debug.h"
#include "Support/Statistic.h"
-#include <dlfcn.h>
+#include "Support/DynamicLinker.h"
+#include "Config/dlfcn.h"
+using namespace llvm;
-Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
+namespace {
+ Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
+ Statistic<> NumGlobals ("lli", "Number of global vars initialized");
+}
-// getPointerToGlobal - This returns the address of the specified global
-// value. This may involve code generation if it's a function.
+ExecutionEngine::ExecutionEngine(ModuleProvider *P) :
+ CurMod(*P->getModule()), MP(P) {
+ assert(P && "ModuleProvider is null?");
+}
+
+ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
+ assert(M && "Module is null?");
+}
+
+ExecutionEngine::~ExecutionEngine() {
+ delete MP;
+}
+
+/// getGlobalValueAtAddress - Return the LLVM global value object that starts
+/// at the specified address.
+///
+const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
+ // If we haven't computed the reverse mapping yet, do so first.
+ if (GlobalAddressReverseMap.empty()) {
+ for (std::map<const GlobalValue*, void *>::iterator I =
+ GlobalAddressMap.begin(), E = GlobalAddressMap.end(); I != E; ++I)
+ GlobalAddressReverseMap.insert(std::make_pair(I->second, I->first));
+ }
+
+ std::map<void *, const GlobalValue*>::iterator I =
+ GlobalAddressReverseMap.find(Addr);
+ return I != GlobalAddressReverseMap.end() ? I->second : 0;
+}
+
+// CreateArgv - Turn a vector of strings into a nice argv style array of
+// pointers to null terminated strings.
//
+static void *CreateArgv(ExecutionEngine *EE,
+ const std::vector<std::string> &InputArgv) {
+ unsigned PtrSize = EE->getTargetData().getPointerSize();
+ char *Result = new char[(InputArgv.size()+1)*PtrSize];
+
+ DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
+ const Type *SBytePtr = PointerType::get(Type::SByteTy);
+
+ for (unsigned i = 0; i != InputArgv.size(); ++i) {
+ unsigned Size = InputArgv[i].size()+1;
+ char *Dest = new char[Size];
+ DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
+
+ std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
+ Dest[Size-1] = 0;
+
+ // Endian safe: Result[i] = (PointerTy)Dest;
+ EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
+ SBytePtr);
+ }
+
+ // Null terminate it
+ EE->StoreValueToMemory(PTOGV(0),
+ (GenericValue*)(Result+InputArgv.size()*PtrSize),
+ SBytePtr);
+ return Result;
+}
+
+/// 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.
+int ExecutionEngine::runFunctionAsMain(Function *Fn,
+ const std::vector<std::string> &argv,
+ const char * const * envp) {
+ std::vector<GenericValue> GVArgs;
+ GenericValue GVArgc;
+ GVArgc.IntVal = argv.size();
+ GVArgs.push_back(GVArgc); // Arg #0 = argc.
+ GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
+ assert(((char **)GVTOP(GVArgs[1]))[0] && "argv[0] was null after CreateArgv");
+
+ std::vector<std::string> EnvVars;
+ for (unsigned i = 0; envp[i]; ++i)
+ EnvVars.push_back(envp[i]);
+ GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
+ return runFunction(Fn, GVArgs).IntVal;
+}
+
+
+
+/// If possible, create a JIT, unless the caller specifically requests an
+/// Interpreter or there's an error. If even an Interpreter cannot be created,
+/// NULL is returned.
+///
+ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
+ bool ForceInterpreter,
+ IntrinsicLowering *IL) {
+ ExecutionEngine *EE = 0;
+
+ // Unless the interpreter was explicitly selected, try making a JIT.
+ if (!ForceInterpreter)
+ EE = JIT::create(MP, IL);
+
+ // If we can't make a JIT, make an interpreter instead.
+ try {
+ if (EE == 0)
+ EE = Interpreter::create(MP->materializeModule(), IL);
+ } catch (...) {
+ EE = 0;
+ }
+
+ if (EE == 0) delete IL;
+ return EE;
+}
+
+/// getPointerToGlobal - This returns the address of the specified global
+/// value. This may involve code generation if it's a function.
+///
void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
- if (const Function *F = dyn_cast<Function>(GV))
+ if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
return getPointerToFunction(F);
- assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
- return GlobalAddress[GV];
+ assert(GlobalAddressMap[GV] && "Global hasn't had an address allocated yet?");
+ return GlobalAddressMap[GV];
}
-
+/// FIXME: document
+///
GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
GenericValue Result;
- if (ConstantExpr *CE = (ConstantExpr*)dyn_cast<ConstantExpr>(C))
+ if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
switch (CE->getOpcode()) {
case Instruction::GetElementPtr: {
- Result = getConstantValue(cast<Constant>(CE->getOperand(0)));
+ Result = getConstantValue(CE->getOperand(0));
std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
uint64_t Offset =
TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
Result.LongVal += Offset;
return Result;
}
+ case Instruction::Cast: {
+ // We only need to handle a few cases here. Almost all casts will
+ // automatically fold, just the ones involving pointers won't.
+ //
+ Constant *Op = CE->getOperand(0);
- default:
- std::cerr << "ConstantExpr not handled as global var init: " << *CE
- << "\n";
- abort();
+ // Handle cast of pointer to pointer...
+ if (Op->getType()->getPrimitiveID() == C->getType()->getPrimitiveID())
+ return getConstantValue(Op);
+
+ // Handle a cast of pointer to any integral type...
+ if (isa<PointerType>(Op->getType()) && C->getType()->isIntegral())
+ return getConstantValue(Op);
+
+ // Handle cast of long to pointer...
+ if (isa<PointerType>(C->getType()) && (Op->getType() == Type::LongTy ||
+ Op->getType() == Type::ULongTy))
+ return getConstantValue(Op);
+ break;
}
+ case Instruction::Add:
+ if (CE->getOperand(0)->getType() == Type::LongTy ||
+ CE->getOperand(0)->getType() == Type::ULongTy)
+ Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
+ getConstantValue(CE->getOperand(1)).LongVal;
+ else
+ break;
+ return Result;
+
+ default:
+ break;
+ }
+ std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
+ abort();
+ }
+
switch (C->getType()->getPrimitiveID()) {
#define GET_CONST_VAL(TY, CLASS) \
case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
if (isa<ConstantPointerNull>(C)) {
Result.PointerVal = 0;
} else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
- Result = PTOGV(getPointerToGlobal(CPR->getValue()));
+ if (Function *F =
+ const_cast<Function*>(dyn_cast<Function>(CPR->getValue())))
+ Result = PTOGV(getPointerToFunctionOrStub(F));
+ else
+ Result = PTOGV(getOrEmitGlobalVariable(
+ cast<GlobalVariable>(CPR->getValue())));
} else {
assert(0 && "Unknown constant pointer type!");
return Result;
}
+/// FIXME: document
+///
void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
- const Type *Ty) {
+ const Type *Ty) {
if (getTargetData().isLittleEndian()) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID:
case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
break;
+ Store4BytesLittleEndian:
case Type::FloatTyID:
case Type::UIntTyID:
case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
break;
+ case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ goto Store4BytesLittleEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
- case Type::LongTyID:
- case Type::PointerTyID: Ptr->Untyped[0] = Val.ULongVal & 255;
+ case Type::LongTyID: Ptr->Untyped[0] = Val.ULongVal & 255;
Ptr->Untyped[1] = (Val.ULongVal >> 8) & 255;
Ptr->Untyped[2] = (Val.ULongVal >> 16) & 255;
Ptr->Untyped[3] = (Val.ULongVal >> 24) & 255;
case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
break;
+ Store4BytesBigEndian:
case Type::FloatTyID:
case Type::UIntTyID:
case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
break;
+ case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ goto Store4BytesBigEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
- case Type::LongTyID:
- case Type::PointerTyID: Ptr->Untyped[7] = Val.ULongVal & 255;
+ case Type::LongTyID: Ptr->Untyped[7] = Val.ULongVal & 255;
Ptr->Untyped[6] = (Val.ULongVal >> 8) & 255;
Ptr->Untyped[5] = (Val.ULongVal >> 16) & 255;
Ptr->Untyped[4] = (Val.ULongVal >> 24) & 255;
}
}
+/// FIXME: document
+///
+GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
+ const Type *Ty) {
+ GenericValue Result;
+ if (getTargetData().isLittleEndian()) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
+ ((unsigned)Ptr->Untyped[1] << 8);
+ break;
+ Load4BytesLittleEndian:
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
+ ((unsigned)Ptr->Untyped[1] << 8) |
+ ((unsigned)Ptr->Untyped[2] << 16) |
+ ((unsigned)Ptr->Untyped[3] << 24);
+ break;
+ case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ goto Load4BytesLittleEndian;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
+ ((uint64_t)Ptr->Untyped[1] << 8) |
+ ((uint64_t)Ptr->Untyped[2] << 16) |
+ ((uint64_t)Ptr->Untyped[3] << 24) |
+ ((uint64_t)Ptr->Untyped[4] << 32) |
+ ((uint64_t)Ptr->Untyped[5] << 40) |
+ ((uint64_t)Ptr->Untyped[6] << 48) |
+ ((uint64_t)Ptr->Untyped[7] << 56);
+ break;
+ default:
+ std::cout << "Cannot load value of type " << *Ty << "!\n";
+ abort();
+ }
+ } else {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
+ ((unsigned)Ptr->Untyped[0] << 8);
+ break;
+ Load4BytesBigEndian:
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
+ ((unsigned)Ptr->Untyped[2] << 8) |
+ ((unsigned)Ptr->Untyped[1] << 16) |
+ ((unsigned)Ptr->Untyped[0] << 24);
+ break;
+ case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
+ goto Load4BytesBigEndian;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
+ ((uint64_t)Ptr->Untyped[6] << 8) |
+ ((uint64_t)Ptr->Untyped[5] << 16) |
+ ((uint64_t)Ptr->Untyped[4] << 24) |
+ ((uint64_t)Ptr->Untyped[3] << 32) |
+ ((uint64_t)Ptr->Untyped[2] << 40) |
+ ((uint64_t)Ptr->Untyped[1] << 48) |
+ ((uint64_t)Ptr->Untyped[0] << 56);
+ break;
+ default:
+ std::cout << "Cannot load value of type " << *Ty << "!\n";
+ abort();
+ }
+ }
+ return Result;
+}
+
// InitializeMemory - Recursive function to apply a Constant value into the
// specified memory location...
//
}
}
-
-
-void *ExecutionEngine::CreateArgv(const std::vector<std::string> &InputArgv) {
- // Pointers are 64 bits...
- // FIXME: Assumes 64 bit target
- PointerTy *Result = new PointerTy[InputArgv.size()+1];
- DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
-
- for (unsigned i = 0; i < InputArgv.size(); ++i) {
- unsigned Size = InputArgv[i].size()+1;
- char *Dest = new char[Size];
- DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
-
- copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
- Dest[Size-1] = 0;
-
- // Endian safe: Result[i] = (PointerTy)Dest;
- StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
- Type::LongTy); // 64 bit assumption
- }
-
- Result[InputArgv.size()] = 0;
- return Result;
-}
-
/// EmitGlobals - Emit all of the global variables to memory, storing their
/// addresses into GlobalAddress. This must make sure to copy the contents of
/// their initializers into the memory.
// Allocate some memory for it!
unsigned Size = TD.getTypeSize(Ty);
- GlobalAddress[I] = new char[Size];
- NumInitBytes += Size;
+ addGlobalMapping(I, new char[Size]);
DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
- << (void*)GlobalAddress[I] << "\n");
+ << getPointerToGlobal(I) << "\n");
} else {
- // External variable reference, try to use dlsym to get a pointer to it in
- // the LLI image.
- if (void *SymAddr = dlsym(0, I->getName().c_str()))
- GlobalAddress[I] = SymAddr;
+ // External variable reference. Try to use the dynamic loader to
+ // get a pointer to it.
+ if (void *SymAddr = GetAddressOfSymbol(I->getName().c_str()))
+ addGlobalMapping(I, SymAddr);
else {
std::cerr << "Could not resolve external global address: "
<< I->getName() << "\n";
for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
I != E; ++I)
if (!I->isExternal())
- InitializeMemory(I->getInitializer(), GlobalAddress[I]);
+ EmitGlobalVariable(I);
}
+// 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 ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
+ void *GA = getPointerToGlobalIfAvailable(GV);
+ const Type *ElTy = GV->getType()->getElementType();
+ if (GA == 0) {
+ // If it's not already specified, allocate memory for the global.
+ GA = new char[getTargetData().getTypeSize(ElTy)];
+ addGlobalMapping(GV, GA);
+ }
+
+ InitializeMemory(GV->getInitializer(), GA);
+ NumInitBytes += getTargetData().getTypeSize(ElTy);
+ ++NumGlobals;
+}
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