mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-10-31 09:11:13 +00:00
b576c94c15
Header files will be on the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9298 91177308-0d34-0410-b5e6-96231b3b80d8
357 lines
13 KiB
C++
357 lines
13 KiB
C++
//===- ReadConst.cpp - Code to constants and constant pools ---------------===//
|
|
//
|
|
// 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 implements functionality to deserialize constants and entire
|
|
// constant pools.
|
|
//
|
|
// Note that this library should be as fast as possible, reentrant, and
|
|
// thread-safe!!
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ReaderInternals.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Constants.h"
|
|
#include <algorithm>
|
|
|
|
const Type *BytecodeParser::parseTypeConstant(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf) {
|
|
unsigned PrimType;
|
|
if (read_vbr(Buf, EndBuf, PrimType)) throw Error_readvbr;
|
|
|
|
const Type *Val = 0;
|
|
if ((Val = Type::getPrimitiveType((Type::PrimitiveID)PrimType)))
|
|
return Val;
|
|
|
|
switch (PrimType) {
|
|
case Type::FunctionTyID: {
|
|
unsigned Typ;
|
|
if (read_vbr(Buf, EndBuf, Typ)) return Val;
|
|
const Type *RetType = getType(Typ);
|
|
|
|
unsigned NumParams;
|
|
if (read_vbr(Buf, EndBuf, NumParams)) return Val;
|
|
|
|
std::vector<const Type*> Params;
|
|
while (NumParams--) {
|
|
if (read_vbr(Buf, EndBuf, Typ)) return Val;
|
|
Params.push_back(getType(Typ));
|
|
}
|
|
|
|
bool isVarArg = Params.size() && Params.back() == Type::VoidTy;
|
|
if (isVarArg) Params.pop_back();
|
|
|
|
return FunctionType::get(RetType, Params, isVarArg);
|
|
}
|
|
case Type::ArrayTyID: {
|
|
unsigned ElTyp;
|
|
if (read_vbr(Buf, EndBuf, ElTyp)) return Val;
|
|
const Type *ElementType = getType(ElTyp);
|
|
|
|
unsigned NumElements;
|
|
if (read_vbr(Buf, EndBuf, NumElements)) return Val;
|
|
|
|
BCR_TRACE(5, "Array Type Constant #" << ElTyp << " size="
|
|
<< NumElements << "\n");
|
|
return ArrayType::get(ElementType, NumElements);
|
|
}
|
|
case Type::StructTyID: {
|
|
unsigned Typ;
|
|
std::vector<const Type*> Elements;
|
|
|
|
if (read_vbr(Buf, EndBuf, Typ)) return Val;
|
|
while (Typ) { // List is terminated by void/0 typeid
|
|
Elements.push_back(getType(Typ));
|
|
if (read_vbr(Buf, EndBuf, Typ)) return Val;
|
|
}
|
|
|
|
return StructType::get(Elements);
|
|
}
|
|
case Type::PointerTyID: {
|
|
unsigned ElTyp;
|
|
if (read_vbr(Buf, EndBuf, ElTyp)) return Val;
|
|
BCR_TRACE(5, "Pointer Type Constant #" << ElTyp << "\n");
|
|
return PointerType::get(getType(ElTyp));
|
|
}
|
|
|
|
case Type::OpaqueTyID: {
|
|
return OpaqueType::get();
|
|
}
|
|
|
|
default:
|
|
std::cerr << __FILE__ << ":" << __LINE__
|
|
<< ": Don't know how to deserialize"
|
|
<< " primitive Type " << PrimType << "\n";
|
|
return Val;
|
|
}
|
|
}
|
|
|
|
// parseTypeConstants - We have to use this weird code to handle recursive
|
|
// types. We know that recursive types will only reference the current slab of
|
|
// values in the type plane, but they can forward reference types before they
|
|
// have been read. For example, Type #0 might be '{ Ty#1 }' and Type #1 might
|
|
// be 'Ty#0*'. When reading Type #0, type number one doesn't exist. To fix
|
|
// this ugly problem, we pessimistically insert an opaque type for each type we
|
|
// are about to read. This means that forward references will resolve to
|
|
// something and when we reread the type later, we can replace the opaque type
|
|
// with a new resolved concrete type.
|
|
//
|
|
void debug_type_tables();
|
|
void BytecodeParser::parseTypeConstants(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf,
|
|
TypeValuesListTy &Tab,
|
|
unsigned NumEntries) {
|
|
assert(Tab.size() == 0 && "should not have read type constants in before!");
|
|
|
|
// Insert a bunch of opaque types to be resolved later...
|
|
for (unsigned i = 0; i < NumEntries; ++i)
|
|
Tab.push_back(OpaqueType::get());
|
|
|
|
// Loop through reading all of the types. Forward types will make use of the
|
|
// opaque types just inserted.
|
|
//
|
|
for (unsigned i = 0; i < NumEntries; ++i) {
|
|
const Type *NewTy = parseTypeConstant(Buf, EndBuf), *OldTy = Tab[i].get();
|
|
if (NewTy == 0) throw std::string("Parsed invalid type.");
|
|
BCR_TRACE(4, "#" << i << ": Read Type Constant: '" << NewTy <<
|
|
"' Replacing: " << OldTy << "\n");
|
|
|
|
// Don't insertValue the new type... instead we want to replace the opaque
|
|
// type with the new concrete value...
|
|
//
|
|
|
|
// Refine the abstract type to the new type. This causes all uses of the
|
|
// abstract type to use the newty. This also will cause the opaque type
|
|
// to be deleted...
|
|
//
|
|
((DerivedType*)Tab[i].get())->refineAbstractTypeTo(NewTy);
|
|
|
|
// This should have replace the old opaque type with the new type in the
|
|
// value table... or with a preexisting type that was already in the system
|
|
assert(Tab[i] != OldTy && "refineAbstractType didn't work!");
|
|
}
|
|
|
|
BCR_TRACE(5, "Resulting types:\n");
|
|
for (unsigned i = 0; i < NumEntries; ++i) {
|
|
BCR_TRACE(5, (void*)Tab[i].get() << " - " << Tab[i].get() << "\n");
|
|
}
|
|
debug_type_tables();
|
|
}
|
|
|
|
|
|
Constant *BytecodeParser::parseConstantValue(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf,
|
|
const Type *Ty) {
|
|
|
|
// We must check for a ConstantExpr before switching by type because
|
|
// a ConstantExpr can be of any type, and has no explicit value.
|
|
//
|
|
unsigned isExprNumArgs; // 0 if not expr; numArgs if is expr
|
|
if (read_vbr(Buf, EndBuf, isExprNumArgs)) throw Error_readvbr;
|
|
if (isExprNumArgs) {
|
|
// FIXME: Encoding of constant exprs could be much more compact!
|
|
unsigned Opcode;
|
|
std::vector<Constant*> ArgVec;
|
|
ArgVec.reserve(isExprNumArgs);
|
|
if (read_vbr(Buf, EndBuf, Opcode)) throw Error_readvbr;
|
|
|
|
// Read the slot number and types of each of the arguments
|
|
for (unsigned i = 0; i != isExprNumArgs; ++i) {
|
|
unsigned ArgValSlot, ArgTypeSlot;
|
|
if (read_vbr(Buf, EndBuf, ArgValSlot)) throw Error_readvbr;
|
|
if (read_vbr(Buf, EndBuf, ArgTypeSlot)) throw Error_readvbr;
|
|
const Type *ArgTy = getType(ArgTypeSlot);
|
|
|
|
BCR_TRACE(4, "CE Arg " << i << ": Type: '" << *ArgTy << "' slot: "
|
|
<< ArgValSlot << "\n");
|
|
|
|
// Get the arg value from its slot if it exists, otherwise a placeholder
|
|
ArgVec.push_back(getConstantValue(ArgTy, ArgValSlot));
|
|
}
|
|
|
|
// Construct a ConstantExpr of the appropriate kind
|
|
if (isExprNumArgs == 1) { // All one-operand expressions
|
|
assert(Opcode == Instruction::Cast);
|
|
return ConstantExpr::getCast(ArgVec[0], Ty);
|
|
} else if (Opcode == Instruction::GetElementPtr) { // GetElementPtr
|
|
std::vector<Constant*> IdxList(ArgVec.begin()+1, ArgVec.end());
|
|
return ConstantExpr::getGetElementPtr(ArgVec[0], IdxList);
|
|
} else { // All other 2-operand expressions
|
|
return ConstantExpr::get(Opcode, ArgVec[0], ArgVec[1]);
|
|
}
|
|
}
|
|
|
|
// Ok, not an ConstantExpr. We now know how to read the given type...
|
|
switch (Ty->getPrimitiveID()) {
|
|
case Type::BoolTyID: {
|
|
unsigned Val;
|
|
if (read_vbr(Buf, EndBuf, Val)) throw Error_readvbr;
|
|
if (Val != 0 && Val != 1) throw std::string("Invalid boolean value read.");
|
|
return ConstantBool::get(Val == 1);
|
|
}
|
|
|
|
case Type::UByteTyID: // Unsigned integer types...
|
|
case Type::UShortTyID:
|
|
case Type::UIntTyID: {
|
|
unsigned Val;
|
|
if (read_vbr(Buf, EndBuf, Val)) throw Error_readvbr;
|
|
if (!ConstantUInt::isValueValidForType(Ty, Val))
|
|
throw std::string("Invalid unsigned byte/short/int read.");
|
|
return ConstantUInt::get(Ty, Val);
|
|
}
|
|
|
|
case Type::ULongTyID: {
|
|
uint64_t Val;
|
|
if (read_vbr(Buf, EndBuf, Val)) throw Error_readvbr;
|
|
return ConstantUInt::get(Ty, Val);
|
|
}
|
|
|
|
case Type::SByteTyID: // Signed integer types...
|
|
case Type::ShortTyID:
|
|
case Type::IntTyID: {
|
|
case Type::LongTyID:
|
|
int64_t Val;
|
|
if (read_vbr(Buf, EndBuf, Val)) throw Error_readvbr;
|
|
if (!ConstantSInt::isValueValidForType(Ty, Val))
|
|
throw std::string("Invalid signed byte/short/int/long read.");
|
|
return ConstantSInt::get(Ty, Val);
|
|
}
|
|
|
|
case Type::FloatTyID: {
|
|
float F;
|
|
if (input_data(Buf, EndBuf, &F, &F+1)) throw Error_inputdata;
|
|
return ConstantFP::get(Ty, F);
|
|
}
|
|
|
|
case Type::DoubleTyID: {
|
|
double Val;
|
|
if (input_data(Buf, EndBuf, &Val, &Val+1)) throw Error_inputdata;
|
|
return ConstantFP::get(Ty, Val);
|
|
}
|
|
|
|
case Type::TypeTyID:
|
|
throw std::string("Type constants shouldn't live in constant table!");
|
|
|
|
case Type::ArrayTyID: {
|
|
const ArrayType *AT = cast<ArrayType>(Ty);
|
|
unsigned NumElements = AT->getNumElements();
|
|
|
|
std::vector<Constant*> Elements;
|
|
while (NumElements--) { // Read all of the elements of the constant.
|
|
unsigned Slot;
|
|
if (read_vbr(Buf, EndBuf, Slot)) throw Error_readvbr;
|
|
Elements.push_back(getConstantValue(AT->getElementType(), Slot));
|
|
}
|
|
return ConstantArray::get(AT, Elements);
|
|
}
|
|
|
|
case Type::StructTyID: {
|
|
const StructType *ST = cast<StructType>(Ty);
|
|
const StructType::ElementTypes &ET = ST->getElementTypes();
|
|
|
|
std::vector<Constant *> Elements;
|
|
for (unsigned i = 0; i < ET.size(); ++i) {
|
|
unsigned Slot;
|
|
if (read_vbr(Buf, EndBuf, Slot)) throw Error_readvbr;
|
|
Elements.push_back(getConstantValue(ET[i], Slot));
|
|
}
|
|
|
|
return ConstantStruct::get(ST, Elements);
|
|
}
|
|
|
|
case Type::PointerTyID: { // ConstantPointerRef value...
|
|
const PointerType *PT = cast<PointerType>(Ty);
|
|
unsigned Slot;
|
|
if (read_vbr(Buf, EndBuf, Slot)) throw Error_readvbr;
|
|
BCR_TRACE(4, "CPR: Type: '" << Ty << "' slot: " << Slot << "\n");
|
|
|
|
// Check to see if we have already read this global variable...
|
|
Value *Val = getValue(PT, Slot, false);
|
|
GlobalValue *GV;
|
|
if (Val) {
|
|
if (!(GV = dyn_cast<GlobalValue>(Val)))
|
|
throw std::string("Value of ConstantPointerRef not in ValueTable!");
|
|
BCR_TRACE(5, "Value Found in ValueTable!\n");
|
|
} else if (RevisionNum > 0) {
|
|
// Revision #0 could have forward references to globals that were weird.
|
|
// We got rid of this in subsequent revs.
|
|
throw std::string("Forward references to globals not allowed.");
|
|
} else { // Nope... find or create a forward ref. for it
|
|
GlobalRefsType::iterator I = GlobalRefs.find(std::make_pair(PT, Slot));
|
|
|
|
if (I != GlobalRefs.end()) {
|
|
BCR_TRACE(5, "Previous forward ref found!\n");
|
|
GV = cast<GlobalValue>(I->second);
|
|
} else {
|
|
BCR_TRACE(5, "Creating new forward ref to a global variable!\n");
|
|
|
|
// Create a placeholder for the global variable reference...
|
|
GlobalVariable *GVar =
|
|
new GlobalVariable(PT->getElementType(), false,
|
|
GlobalValue::InternalLinkage);
|
|
|
|
// Keep track of the fact that we have a forward ref to recycle it
|
|
GlobalRefs.insert(std::make_pair(std::make_pair(PT, Slot), GVar));
|
|
|
|
// Must temporarily push this value into the module table...
|
|
TheModule->getGlobalList().push_back(GVar);
|
|
GV = GVar;
|
|
}
|
|
}
|
|
|
|
return ConstantPointerRef::get(GV);
|
|
}
|
|
|
|
default:
|
|
throw std::string("Don't know how to deserialize constant value of type '"+
|
|
Ty->getDescription());
|
|
}
|
|
}
|
|
|
|
void BytecodeParser::ParseGlobalTypes(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf) {
|
|
ValueTable T;
|
|
ParseConstantPool(Buf, EndBuf, T, ModuleTypeValues);
|
|
}
|
|
|
|
void BytecodeParser::ParseConstantPool(const unsigned char *&Buf,
|
|
const unsigned char *EndBuf,
|
|
ValueTable &Tab,
|
|
TypeValuesListTy &TypeTab) {
|
|
while (Buf < EndBuf) {
|
|
unsigned NumEntries, Typ;
|
|
|
|
if (read_vbr(Buf, EndBuf, NumEntries) ||
|
|
read_vbr(Buf, EndBuf, Typ)) throw Error_readvbr;
|
|
if (Typ == Type::TypeTyID) {
|
|
BCR_TRACE(3, "Type: 'type' NumEntries: " << NumEntries << "\n");
|
|
parseTypeConstants(Buf, EndBuf, TypeTab, NumEntries);
|
|
} else {
|
|
const Type *Ty = getType(Typ);
|
|
BCR_TRACE(3, "Type: '" << *Ty << "' NumEntries: " << NumEntries << "\n");
|
|
|
|
for (unsigned i = 0; i < NumEntries; ++i) {
|
|
Constant *C = parseConstantValue(Buf, EndBuf, Ty);
|
|
assert(C && "parseConstantValue returned NULL!");
|
|
BCR_TRACE(4, "Read Constant: '" << *C << "'\n");
|
|
unsigned Slot = insertValue(C, Typ, Tab);
|
|
|
|
// If we are reading a function constant table, make sure that we adjust
|
|
// the slot number to be the real global constant number.
|
|
//
|
|
if (&Tab != &ModuleValues && Typ < ModuleValues.size())
|
|
Slot += ModuleValues[Typ]->size();
|
|
ResolveReferencesToValue(C, Slot);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Buf > EndBuf) throw std::string("Read past end of buffer.");
|
|
}
|