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-rw-r--r--lib/ExecutionEngine/ExecutionEngine.cpp226
1 files changed, 226 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
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+//===-- ExecutionEngine.cpp - Common Implementation shared by EE's --------===//
+//
+// This file defines the common interface used by the various execution engine
+// subclasses.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ExecutionEngine.h"
+#include "GenericValue.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Constants.h"
+#include "llvm/Module.h"
+#include "llvm/Target/TargetData.h"
+#include "Support/Statistic.h"
+
+Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
+
+// 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))
+ return getPointerToFunction(F);
+
+ assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
+ return GlobalAddress[GV];
+}
+
+
+GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
+ GenericValue Result;
+#define GET_CONST_VAL(TY, CLASS) \
+ case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
+
+ switch (C->getType()->getPrimitiveID()) {
+ GET_CONST_VAL(Bool , ConstantBool);
+ GET_CONST_VAL(UByte , ConstantUInt);
+ GET_CONST_VAL(SByte , ConstantSInt);
+ GET_CONST_VAL(UShort , ConstantUInt);
+ GET_CONST_VAL(Short , ConstantSInt);
+ GET_CONST_VAL(UInt , ConstantUInt);
+ GET_CONST_VAL(Int , ConstantSInt);
+ GET_CONST_VAL(ULong , ConstantUInt);
+ GET_CONST_VAL(Long , ConstantSInt);
+ GET_CONST_VAL(Float , ConstantFP);
+ GET_CONST_VAL(Double , ConstantFP);
+#undef GET_CONST_VAL
+ case Type::PointerTyID:
+ if (isa<ConstantPointerNull>(C)) {
+ Result.PointerVal = 0;
+ } else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
+ Result = PTOGV(getPointerToGlobal(CPR->getValue()));
+
+ } else {
+ assert(0 && "Unknown constant pointer type!");
+ }
+ break;
+ default:
+ cout << "ERROR: Constant unimp for type: " << C->getType() << "\n";
+ }
+ return Result;
+}
+
+void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
+ const Type *Ty) {
+ if (getTargetData().isLittleEndian()) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
+ Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
+ break;
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
+ Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
+ Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
+ Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
+ break;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID:
+ case Type::PointerTyID: 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;
+ Ptr->Untyped[4] = (Val.ULongVal >> 32) & 255;
+ Ptr->Untyped[5] = (Val.ULongVal >> 40) & 255;
+ Ptr->Untyped[6] = (Val.ULongVal >> 48) & 255;
+ Ptr->Untyped[7] = (Val.ULongVal >> 56) & 255;
+ break;
+ default:
+ cout << "Cannot store value of type " << Ty << "!\n";
+ }
+ } else {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
+ Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
+ break;
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
+ Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
+ Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
+ Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
+ break;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID:
+ case Type::PointerTyID: 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;
+ Ptr->Untyped[3] = (Val.ULongVal >> 32) & 255;
+ Ptr->Untyped[2] = (Val.ULongVal >> 40) & 255;
+ Ptr->Untyped[1] = (Val.ULongVal >> 48) & 255;
+ Ptr->Untyped[0] = (Val.ULongVal >> 56) & 255;
+ break;
+ default:
+ cout << "Cannot store value of type " << Ty << "!\n";
+ }
+ }
+}
+
+// InitializeMemory - Recursive function to apply a Constant value into the
+// specified memory location...
+//
+void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
+ if (Init->getType()->isFirstClassType()) {
+ GenericValue Val = getConstantValue(Init);
+ StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
+ return;
+ }
+
+ switch (Init->getType()->getPrimitiveID()) {
+ case Type::ArrayTyID: {
+ const ConstantArray *CPA = cast<ConstantArray>(Init);
+ const vector<Use> &Val = CPA->getValues();
+ unsigned ElementSize =
+ getTargetData().getTypeSize(cast<ArrayType>(CPA->getType())->getElementType());
+ for (unsigned i = 0; i < Val.size(); ++i)
+ InitializeMemory(cast<Constant>(Val[i].get()), (char*)Addr+i*ElementSize);
+ return;
+ }
+
+ case Type::StructTyID: {
+ const ConstantStruct *CPS = cast<ConstantStruct>(Init);
+ const StructLayout *SL =
+ getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
+ const vector<Use> &Val = CPS->getValues();
+ for (unsigned i = 0; i < Val.size(); ++i)
+ InitializeMemory(cast<Constant>(Val[i].get()),
+ (char*)Addr+SL->MemberOffsets[i]);
+ return;
+ }
+
+ default:
+ std::cerr << "Bad Type: " << Init->getType() << "\n";
+ assert(0 && "Unknown constant type to initialize memory with!");
+ }
+}
+
+
+
+void *ExecutionEngine::CreateArgv(const std::vector<std::string> &InputArgv) {
+ // Pointers are 64 bits...
+ PointerTy *Result = new PointerTy[InputArgv.size()+1]; // 64 bit assumption
+ 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.
+///
+void ExecutionEngine::emitGlobals() {
+ const TargetData &TD = getTargetData();
+
+ // Loop over all of the global variables in the program, allocating the memory
+ // to hold them.
+ for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
+ 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);
+ GlobalAddress[I] = new char[Size];
+ NumInitBytes += Size;
+
+ DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
+ << (void*)GlobalAddress[I] << "\n");
+ } else {
+ assert(0 && "References to external globals not handled yet!");
+ }
+
+ // Now that all of the globals are set up in memory, loop through them all and
+ // initialize their contents.
+ for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
+ I != E; ++I)
+ if (!I->isExternal())
+ InitializeMemory(I->getInitializer(), GlobalAddress[I]);
+}
+
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