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llvm-6502/lib/ExecutionEngine/ExecutionEngine.cpp
Chris Lattner c879e8ffc4 Consult the target data, not the module, about how large the current pointer 
size is.  This ensures that if the module has no specified pointer size that
things will work correctly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8136 91177308-0d34-0410-b5e6-96231b3b80d8
2003-08-24 19:55:26 +00:00

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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.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "jit"
#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/Debug.h"
#include "Support/Statistic.h"
#include "Config/dlfcn.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 (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];
}
GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
GenericValue Result;
if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
switch (CE->getOpcode()) {
case Instruction::GetElementPtr: {
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);
// 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
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:
std::cout << "ERROR: Constant unimp for type: " << C->getType() << "\n";
abort();
}
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;
Store4BytesLittleEndian:
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::PointerTyID: if (getTargetData().getPointerSize() == 4)
goto Store4BytesLittleEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
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;
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:
std::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;
Store4BytesBigEndian:
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::PointerTyID: if (getTargetData().getPointerSize() == 4)
goto Store4BytesBigEndian;
case Type::DoubleTyID:
case Type::ULongTyID:
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;
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:
std::cout << "Cannot store value of type " << Ty << "!\n";
}
}
}
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::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 std::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 std::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) {
if (getTargetData().getPointerSize() == 8) { // 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);
}
Result[InputArgv.size()] = 0;
return Result;
} else { // 32 bit target?
int *Result = new int[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::IntTy);
}
Result[InputArgv.size()] = 0; // null terminate it
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 {
// On Sparc, RTLD_SELF is already defined and it's not zero
// Linux/x86 wants to use a 0, other systems may differ
#ifndef RTLD_SELF
#define RTLD_SELF 0
#endif
// External variable reference, try to use dlsym to get a pointer to it in
// the LLI image.
if (void *SymAddr = dlsym(RTLD_SELF, I->getName().c_str()))
GlobalAddress[I] = SymAddr;
else {
std::cerr << "Could not resolve external global address: "
<< I->getName() << "\n";
abort();
}
}
// 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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