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llvm-6502/lib/Bytecode/Reader/Reader.cpp
Reid Spencer 060d25d1dc MAJOR REWRITE. 
- stop passing Buf/BufEnd to every function (now member vars)
- internalize things that used to be in a header file that no one else
  included/needed.
- Remove defunct BCR_TRACE lines
- Standardize error handling with the PARSE_ERROR macro.
- Integrate ConstantReader.cpp and InstructionReader.cpp and reorgnize
  the definition order so that gcc has a chance at optimizing this module
- Standardize case and style of method names.
- Eliminate unneeded header files
- Prepare for Type != Value (bug122) change by splitting Types into their
  own data structures.
- Implement the BytecodeHandler interface calls.
- Provide default implementation of BytecodeHandler interface.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14494 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-29 23:29:38 +00:00

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//===- Reader.cpp - Code to read bytecode files ---------------------------===//
//
// 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 library implements the functionality defined in llvm/Bytecode/Reader.h
//
// Note that this library should be as fast as possible, reentrant, and
// threadsafe!!
//
// TODO: Allow passing in an option to ignore the symbol table
//
//===----------------------------------------------------------------------===//
#include "Reader.h"
#include "llvm/Bytecode/BytecodeHandler.h"
#include "llvm/BasicBlock.h"
#include "llvm/Constants.h"
#include "llvm/iMemory.h"
#include "llvm/iOther.h"
#include "llvm/iPHINode.h"
#include "llvm/iTerminators.h"
#include "llvm/Bytecode/Format.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "Support/StringExtras.h"
#include <sstream>
using namespace llvm;
/// A convenience macro for calling the handler. Makes maintenance easier in
/// case the interface to handler methods changes.
#define HANDLE(method) \
if ( Handler ) Handler->handle ## method
/// A convenience macro for handling parsing errors.
#define PARSE_ERROR(inserters) { \
std::ostringstream errormsg; \
errormsg << inserters; \
throw std::string(errormsg.str()); \
}
/// @brief A class for maintaining the slot number definition
/// as a placeholder for the actual definition.
template<class SuperType>
class PlaceholderDef : public SuperType {
unsigned ID;
PlaceholderDef(); // DO NOT IMPLEMENT
void operator=(const PlaceholderDef &); // DO NOT IMPLEMENT
public:
PlaceholderDef(const Type *Ty, unsigned id) : SuperType(Ty), ID(id) {}
unsigned getID() { return ID; }
};
struct ConstantPlaceHolderHelper : public ConstantExpr {
ConstantPlaceHolderHelper(const Type *Ty)
: ConstantExpr(Instruction::UserOp1, Constant::getNullValue(Ty), Ty) {}
};
typedef PlaceholderDef<ConstantPlaceHolderHelper> ConstPHolder;
//===----------------------------------------------------------------------===//
// Bytecode Reading Methods
//===----------------------------------------------------------------------===//
inline bool BytecodeReader::moreInBlock() {
return At < BlockEnd;
}
inline void BytecodeReader::checkPastBlockEnd(const char * block_name) {
if ( At > BlockEnd )
PARSE_ERROR("Attempt to read past the end of " << block_name << " block.");
}
inline void BytecodeReader::align32() {
BufPtr Save = At;
At = (const unsigned char *)((unsigned long)(At+3) & (~3UL));
if ( At > Save )
HANDLE(Alignment( At - Save ));
if (At > BlockEnd)
PARSE_ERROR("Ran out of data while aligning!");
}
inline unsigned BytecodeReader::read_uint() {
if (At+4 > BlockEnd)
PARSE_ERROR("Ran out of data reading uint!");
At += 4;
return At[-4] | (At[-3] << 8) | (At[-2] << 16) | (At[-1] << 24);
}
inline unsigned BytecodeReader::read_vbr_uint() {
unsigned Shift = 0;
unsigned Result = 0;
BufPtr Save = At;
do {
if (At == BlockEnd)
PARSE_ERROR("Ran out of data reading vbr_uint!");
Result |= (unsigned)((*At++) & 0x7F) << Shift;
Shift += 7;
} while (At[-1] & 0x80);
HANDLE(VBR32(At-Save));
return Result;
}
inline uint64_t BytecodeReader::read_vbr_uint64() {
unsigned Shift = 0;
uint64_t Result = 0;
BufPtr Save = At;
do {
if (At == BlockEnd)
PARSE_ERROR("Ran out of data reading vbr_uint64!");
Result |= (uint64_t)((*At++) & 0x7F) << Shift;
Shift += 7;
} while (At[-1] & 0x80);
HANDLE(VBR64(At-Save));
return Result;
}
inline int64_t BytecodeReader::read_vbr_int64() {
uint64_t R = read_vbr_uint64();
if (R & 1) {
if (R != 1)
return -(int64_t)(R >> 1);
else // There is no such thing as -0 with integers. "-0" really means
// 0x8000000000000000.
return 1LL << 63;
} else
return (int64_t)(R >> 1);
}
inline std::string BytecodeReader::read_str() {
unsigned Size = read_vbr_uint();
const unsigned char *OldAt = At;
At += Size;
if (At > BlockEnd) // Size invalid?
PARSE_ERROR("Ran out of data reading a string!");
return std::string((char*)OldAt, Size);
}
inline void BytecodeReader::read_data(void *Ptr, void *End) {
unsigned char *Start = (unsigned char *)Ptr;
unsigned Amount = (unsigned char *)End - Start;
if (At+Amount > BlockEnd)
PARSE_ERROR("Ran out of data!");
std::copy(At, At+Amount, Start);
At += Amount;
}
inline void BytecodeReader::read_block(unsigned &Type, unsigned &Size) {
Type = read_uint();
Size = read_uint();
BlockStart = At;
if ( At + Size > BlockEnd )
PARSE_ERROR("Attempt to size a block past end of memory");
BlockEnd = At + Size;
HANDLE(Block( Type, BlockStart, Size ));
}
//===----------------------------------------------------------------------===//
// IR Lookup Methods
//===----------------------------------------------------------------------===//
inline bool BytecodeReader::hasImplicitNull(unsigned TyID ) {
if (!hasExplicitPrimitiveZeros)
return TyID != Type::LabelTyID && TyID != Type::TypeTyID &&
TyID != Type::VoidTyID;
return TyID >= Type::FirstDerivedTyID;
}
const Type *BytecodeReader::getType(unsigned ID) {
if (ID < Type::FirstDerivedTyID)
if (const Type *T = Type::getPrimitiveType((Type::TypeID)ID))
return T; // Asked for a primitive type...
// Otherwise, derived types need offset...
ID -= Type::FirstDerivedTyID;
if (!CompactionTypes.empty()) {
if (ID >= CompactionTypes.size())
PARSE_ERROR("Type ID out of range for compaction table!");
return CompactionTypes[ID];
}
// Is it a module-level type?
if (ID < ModuleTypes.size())
return ModuleTypes[ID].get();
// Nope, is it a function-level type?
ID -= ModuleTypes.size();
if (ID < FunctionTypes.size())
return FunctionTypes[ID].get();
PARSE_ERROR("Illegal type reference!");
return Type::VoidTy;
}
unsigned BytecodeReader::getTypeSlot(const Type *Ty) {
if (Ty->isPrimitiveType())
return Ty->getTypeID();
// Scan the compaction table for the type if needed.
if (!CompactionTypes.empty()) {
std::vector<const Type*>::const_iterator I =
find(CompactionTypes.begin(), CompactionTypes.end(), Ty);
if (I == CompactionTypes.end())
PARSE_ERROR("Couldn't find type specified in compaction table!");
return Type::FirstDerivedTyID + (&*I - &CompactionTypes[0]);
}
// Check the function level types first...
TypeListTy::iterator I = find(FunctionTypes.begin(), FunctionTypes.end(), Ty);
if (I != FunctionTypes.end())
return Type::FirstDerivedTyID + ModuleTypes.size() +
(&*I - &FunctionTypes[0]);
// Check the module level types now...
I = find(ModuleTypes.begin(), ModuleTypes.end(), Ty);
if (I == ModuleTypes.end())
PARSE_ERROR("Didn't find type in ModuleTypes.");
return Type::FirstDerivedTyID + (&*I - &ModuleTypes[0]);
}
const Type *BytecodeReader::getGlobalTableType(unsigned Slot) {
if (Slot < Type::FirstDerivedTyID) {
const Type *Ty = Type::getPrimitiveType((Type::TypeID)Slot);
assert(Ty && "Not a primitive type ID?");
return Ty;
}
Slot -= Type::FirstDerivedTyID;
if (Slot >= ModuleTypes.size())
PARSE_ERROR("Illegal compaction table type reference!");
return ModuleTypes[Slot];
}
unsigned BytecodeReader::getGlobalTableTypeSlot(const Type *Ty) {
if (Ty->isPrimitiveType())
return Ty->getTypeID();
TypeListTy::iterator I = find(ModuleTypes.begin(),
ModuleTypes.end(), Ty);
if (I == ModuleTypes.end())
PARSE_ERROR("Didn't find type in ModuleTypes.");
return Type::FirstDerivedTyID + (&*I - &ModuleTypes[0]);
}
Value * BytecodeReader::getValue(unsigned type, unsigned oNum, bool Create) {
assert(type != Type::TypeTyID && "getValue() cannot get types!");
assert(type != Type::LabelTyID && "getValue() cannot get blocks!");
unsigned Num = oNum;
// If there is a compaction table active, it defines the low-level numbers.
// If not, the module values define the low-level numbers.
if (CompactionValues.size() > type && !CompactionValues[type].empty()) {
if (Num < CompactionValues[type].size())
return CompactionValues[type][Num];
Num -= CompactionValues[type].size();
} else {
// By default, the global type id is the type id passed in
unsigned GlobalTyID = type;
// If the type plane was compactified, figure out the global type ID
// by adding the derived type ids and the distance.
if (CompactionValues.size() > Type::TypeTyID &&
!CompactionTypes.empty() &&
type >= Type::FirstDerivedTyID) {
const Type *Ty = CompactionTypes[type-Type::FirstDerivedTyID];
TypeListTy::iterator I =
find(ModuleTypes.begin(), ModuleTypes.end(), Ty);
assert(I != ModuleTypes.end());
GlobalTyID = Type::FirstDerivedTyID + (&*I - &ModuleTypes[0]);
}
if (hasImplicitNull(GlobalTyID)) {
if (Num == 0)
return Constant::getNullValue(getType(type));
--Num;
}
if (GlobalTyID < ModuleValues.size() && ModuleValues[GlobalTyID]) {
if (Num < ModuleValues[GlobalTyID]->size())
return ModuleValues[GlobalTyID]->getOperand(Num);
Num -= ModuleValues[GlobalTyID]->size();
}
}
if (FunctionValues.size() > type &&
FunctionValues[type] &&
Num < FunctionValues[type]->size())
return FunctionValues[type]->getOperand(Num);
if (!Create) return 0; // Do not create a placeholder?
std::pair<unsigned,unsigned> KeyValue(type, oNum);
ForwardReferenceMap::iterator I = ForwardReferences.lower_bound(KeyValue);
if (I != ForwardReferences.end() && I->first == KeyValue)
return I->second; // We have already created this placeholder
Value *Val = new Argument(getType(type));
ForwardReferences.insert(I, std::make_pair(KeyValue, Val));
return Val;
}
Value* BytecodeReader::getGlobalTableValue(const Type *Ty, unsigned SlotNo) {
// FIXME: getTypeSlot is inefficient!
unsigned TyID = getGlobalTableTypeSlot(Ty);
if (TyID != Type::LabelTyID) {
if (SlotNo == 0)
return Constant::getNullValue(Ty);
--SlotNo;
}
if (TyID >= ModuleValues.size() || ModuleValues[TyID] == 0 ||
SlotNo >= ModuleValues[TyID]->size()) {
PARSE_ERROR("Corrupt compaction table entry!"
<< TyID << ", " << SlotNo << ": " << ModuleValues.size() << ", "
<< (void*)ModuleValues[TyID] << ", "
<< ModuleValues[TyID]->size() << "\n");
}
return ModuleValues[TyID]->getOperand(SlotNo);
}
Constant* BytecodeReader::getConstantValue(unsigned TypeSlot, unsigned Slot) {
if (Value *V = getValue(TypeSlot, Slot, false))
if (Constant *C = dyn_cast<Constant>(V))
return C; // If we already have the value parsed, just return it
else if (GlobalValue *GV = dyn_cast<GlobalValue>(V))
// ConstantPointerRef's are an abomination, but at least they don't have
// to infest bytecode files.
return ConstantPointerRef::get(GV);
else
PARSE_ERROR("Reference of a value is expected to be a constant!");
const Type *Ty = getType(TypeSlot);
std::pair<const Type*, unsigned> Key(Ty, Slot);
ConstantRefsType::iterator I = ConstantFwdRefs.lower_bound(Key);
if (I != ConstantFwdRefs.end() && I->first == Key) {
return I->second;
} else {
// Create a placeholder for the constant reference and
// keep track of the fact that we have a forward ref to recycle it
Constant *C = new ConstPHolder(Ty, Slot);
// Keep track of the fact that we have a forward ref to recycle it
ConstantFwdRefs.insert(I, std::make_pair(Key, C));
return C;
}
}
//===----------------------------------------------------------------------===//
// IR Construction Methods
//===----------------------------------------------------------------------===//
unsigned BytecodeReader::insertValue(
Value *Val, unsigned type, ValueTable &ValueTab) {
assert((!isa<Constant>(Val) || !cast<Constant>(Val)->isNullValue()) ||
!hasImplicitNull(type) &&
"Cannot read null values from bytecode!");
assert(type != Type::TypeTyID && "Types should never be insertValue'd!");
if (ValueTab.size() <= type)
ValueTab.resize(type+1);
if (!ValueTab[type]) ValueTab[type] = new ValueList();
ValueTab[type]->push_back(Val);
bool HasOffset = hasImplicitNull(type);
return ValueTab[type]->size()-1 + HasOffset;
}
void BytecodeReader::insertArguments(Function* F ) {
const FunctionType *FT = F->getFunctionType();
Function::aiterator AI = F->abegin();
for (FunctionType::param_iterator It = FT->param_begin();
It != FT->param_end(); ++It, ++AI)
insertValue(AI, getTypeSlot(AI->getType()), FunctionValues);
}
//===----------------------------------------------------------------------===//
// Bytecode Parsing Methods
//===----------------------------------------------------------------------===//
void BytecodeReader::ParseInstruction(std::vector<unsigned> &Oprnds,
BasicBlock* BB) {
BufPtr SaveAt = At;
// Clear instruction data
Oprnds.clear();
unsigned iType = 0;
unsigned Opcode = 0;
unsigned Op = read_uint();
// bits Instruction format: Common to all formats
// --------------------------
// 01-00: Opcode type, fixed to 1.
// 07-02: Opcode
Opcode = (Op >> 2) & 63;
Oprnds.resize((Op >> 0) & 03);
// Extract the operands
switch (Oprnds.size()) {
case 1:
// bits Instruction format:
// --------------------------
// 19-08: Resulting type plane
// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
//
iType = (Op >> 8) & 4095;
Oprnds[0] = (Op >> 20) & 4095;
if (Oprnds[0] == 4095) // Handle special encoding for 0 operands...
Oprnds.resize(0);
break;
case 2:
// bits Instruction format:
// --------------------------
// 15-08: Resulting type plane
// 23-16: Operand #1
// 31-24: Operand #2
//
iType = (Op >> 8) & 255;
Oprnds[0] = (Op >> 16) & 255;
Oprnds[1] = (Op >> 24) & 255;
break;
case 3:
// bits Instruction format:
// --------------------------
// 13-08: Resulting type plane
// 19-14: Operand #1
// 25-20: Operand #2
// 31-26: Operand #3
//
iType = (Op >> 8) & 63;
Oprnds[0] = (Op >> 14) & 63;
Oprnds[1] = (Op >> 20) & 63;
Oprnds[2] = (Op >> 26) & 63;
break;
case 0:
At -= 4; // Hrm, try this again...
Opcode = read_vbr_uint();
Opcode >>= 2;
iType = read_vbr_uint();
unsigned NumOprnds = read_vbr_uint();
Oprnds.resize(NumOprnds);
if (NumOprnds == 0)
PARSE_ERROR("Zero-argument instruction found; this is invalid.");
for (unsigned i = 0; i != NumOprnds; ++i)
Oprnds[i] = read_vbr_uint();
align32();
break;
}
// Get the type of the instruction
const Type *InstTy = getType(iType);
// Hae enough to inform the handler now
HANDLE(Instruction(Opcode, InstTy, Oprnds, At-SaveAt));
// Declare the resulting instruction we'll build.
Instruction *Result = 0;
// Handle binary operators
if (Opcode >= Instruction::BinaryOpsBegin &&
Opcode < Instruction::BinaryOpsEnd && Oprnds.size() == 2)
Result = BinaryOperator::create((Instruction::BinaryOps)Opcode,
getValue(iType, Oprnds[0]),
getValue(iType, Oprnds[1]));
switch (Opcode) {
default:
if (Result == 0) PARSE_ERROR("Illegal instruction read!");
break;
case Instruction::VAArg:
Result = new VAArgInst(getValue(iType, Oprnds[0]), getType(Oprnds[1]));
break;
case Instruction::VANext:
Result = new VANextInst(getValue(iType, Oprnds[0]), getType(Oprnds[1]));
break;
case Instruction::Cast:
Result = new CastInst(getValue(iType, Oprnds[0]), getType(Oprnds[1]));
break;
case Instruction::Select:
Result = new SelectInst(getValue(Type::BoolTyID, Oprnds[0]),
getValue(iType, Oprnds[1]),
getValue(iType, Oprnds[2]));
break;
case Instruction::PHI: {
if (Oprnds.size() == 0 || (Oprnds.size() & 1))
PARSE_ERROR("Invalid phi node encountered!\n");
PHINode *PN = new PHINode(InstTy);
PN->op_reserve(Oprnds.size());
for (unsigned i = 0, e = Oprnds.size(); i != e; i += 2)
PN->addIncoming(getValue(iType, Oprnds[i]), getBasicBlock(Oprnds[i+1]));
Result = PN;
break;
}
case Instruction::Shl:
case Instruction::Shr:
Result = new ShiftInst((Instruction::OtherOps)Opcode,
getValue(iType, Oprnds[0]),
getValue(Type::UByteTyID, Oprnds[1]));
break;
case Instruction::Ret:
if (Oprnds.size() == 0)
Result = new ReturnInst();
else if (Oprnds.size() == 1)
Result = new ReturnInst(getValue(iType, Oprnds[0]));
else
PARSE_ERROR("Unrecognized instruction!");
break;
case Instruction::Br:
if (Oprnds.size() == 1)
Result = new BranchInst(getBasicBlock(Oprnds[0]));
else if (Oprnds.size() == 3)
Result = new BranchInst(getBasicBlock(Oprnds[0]),
getBasicBlock(Oprnds[1]), getValue(Type::BoolTyID , Oprnds[2]));
else
PARSE_ERROR("Invalid number of operands for a 'br' instruction!");
break;
case Instruction::Switch: {
if (Oprnds.size() & 1)
PARSE_ERROR("Switch statement with odd number of arguments!");
SwitchInst *I = new SwitchInst(getValue(iType, Oprnds[0]),
getBasicBlock(Oprnds[1]));
for (unsigned i = 2, e = Oprnds.size(); i != e; i += 2)
I->addCase(cast<Constant>(getValue(iType, Oprnds[i])),
getBasicBlock(Oprnds[i+1]));
Result = I;
break;
}
case Instruction::Call: {
if (Oprnds.size() == 0)
PARSE_ERROR("Invalid call instruction encountered!");
Value *F = getValue(iType, Oprnds[0]);
// Check to make sure we have a pointer to function type
const PointerType *PTy = dyn_cast<PointerType>(F->getType());
if (PTy == 0) PARSE_ERROR("Call to non function pointer value!");
const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
if (FTy == 0) PARSE_ERROR("Call to non function pointer value!");
std::vector<Value *> Params;
if (!FTy->isVarArg()) {
FunctionType::param_iterator It = FTy->param_begin();
for (unsigned i = 1, e = Oprnds.size(); i != e; ++i) {
if (It == FTy->param_end())
PARSE_ERROR("Invalid call instruction!");
Params.push_back(getValue(getTypeSlot(*It++), Oprnds[i]));
}
if (It != FTy->param_end())
PARSE_ERROR("Invalid call instruction!");
} else {
Oprnds.erase(Oprnds.begin(), Oprnds.begin()+1);
unsigned FirstVariableOperand;
if (Oprnds.size() < FTy->getNumParams())
PARSE_ERROR("Call instruction missing operands!");
// Read all of the fixed arguments
for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
Params.push_back(getValue(getTypeSlot(FTy->getParamType(i)),Oprnds[i]));
FirstVariableOperand = FTy->getNumParams();
if ((Oprnds.size()-FirstVariableOperand) & 1) // Must be pairs of type/value
PARSE_ERROR("Invalid call instruction!");
for (unsigned i = FirstVariableOperand, e = Oprnds.size();
i != e; i += 2)
Params.push_back(getValue(Oprnds[i], Oprnds[i+1]));
}
Result = new CallInst(F, Params);
break;
}
case Instruction::Invoke: {
if (Oprnds.size() < 3) PARSE_ERROR("Invalid invoke instruction!");
Value *F = getValue(iType, Oprnds[0]);
// Check to make sure we have a pointer to function type
const PointerType *PTy = dyn_cast<PointerType>(F->getType());
if (PTy == 0) PARSE_ERROR("Invoke to non function pointer value!");
const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
if (FTy == 0) PARSE_ERROR("Invoke to non function pointer value!");
std::vector<Value *> Params;
BasicBlock *Normal, *Except;
if (!FTy->isVarArg()) {
Normal = getBasicBlock(Oprnds[1]);
Except = getBasicBlock(Oprnds[2]);
FunctionType::param_iterator It = FTy->param_begin();
for (unsigned i = 3, e = Oprnds.size(); i != e; ++i) {
if (It == FTy->param_end())
PARSE_ERROR("Invalid invoke instruction!");
Params.push_back(getValue(getTypeSlot(*It++), Oprnds[i]));
}
if (It != FTy->param_end())
PARSE_ERROR("Invalid invoke instruction!");
} else {
Oprnds.erase(Oprnds.begin(), Oprnds.begin()+1);
Normal = getBasicBlock(Oprnds[0]);
Except = getBasicBlock(Oprnds[1]);
unsigned FirstVariableArgument = FTy->getNumParams()+2;
for (unsigned i = 2; i != FirstVariableArgument; ++i)
Params.push_back(getValue(getTypeSlot(FTy->getParamType(i-2)),
Oprnds[i]));
if (Oprnds.size()-FirstVariableArgument & 1) // Must be type/value pairs
PARSE_ERROR("Invalid invoke instruction!");
for (unsigned i = FirstVariableArgument; i < Oprnds.size(); i += 2)
Params.push_back(getValue(Oprnds[i], Oprnds[i+1]));
}
Result = new InvokeInst(F, Normal, Except, Params);
break;
}
case Instruction::Malloc:
if (Oprnds.size() > 2) PARSE_ERROR("Invalid malloc instruction!");
if (!isa<PointerType>(InstTy))
PARSE_ERROR("Invalid malloc instruction!");
Result = new MallocInst(cast<PointerType>(InstTy)->getElementType(),
Oprnds.size() ? getValue(Type::UIntTyID,
Oprnds[0]) : 0);
break;
case Instruction::Alloca:
if (Oprnds.size() > 2) PARSE_ERROR("Invalid alloca instruction!");
if (!isa<PointerType>(InstTy))
PARSE_ERROR("Invalid alloca instruction!");
Result = new AllocaInst(cast<PointerType>(InstTy)->getElementType(),
Oprnds.size() ? getValue(Type::UIntTyID,
Oprnds[0]) :0);
break;
case Instruction::Free:
if (!isa<PointerType>(InstTy))
PARSE_ERROR("Invalid free instruction!");
Result = new FreeInst(getValue(iType, Oprnds[0]));
break;
case Instruction::GetElementPtr: {
if (Oprnds.size() == 0 || !isa<PointerType>(InstTy))
PARSE_ERROR("Invalid getelementptr instruction!");
std::vector<Value*> Idx;
const Type *NextTy = InstTy;
for (unsigned i = 1, e = Oprnds.size(); i != e; ++i) {
const CompositeType *TopTy = dyn_cast_or_null<CompositeType>(NextTy);
if (!TopTy) PARSE_ERROR("Invalid getelementptr instruction!");
unsigned ValIdx = Oprnds[i];
unsigned IdxTy = 0;
if (!hasRestrictedGEPTypes) {
// Struct indices are always uints, sequential type indices can be any
// of the 32 or 64-bit integer types. The actual choice of type is
// encoded in the low two bits of the slot number.
if (isa<StructType>(TopTy))
IdxTy = Type::UIntTyID;
else {
switch (ValIdx & 3) {
default:
case 0: IdxTy = Type::UIntTyID; break;
case 1: IdxTy = Type::IntTyID; break;
case 2: IdxTy = Type::ULongTyID; break;
case 3: IdxTy = Type::LongTyID; break;
}
ValIdx >>= 2;
}
} else {
IdxTy = isa<StructType>(TopTy) ? Type::UByteTyID : Type::LongTyID;
}
Idx.push_back(getValue(IdxTy, ValIdx));
// Convert ubyte struct indices into uint struct indices.
if (isa<StructType>(TopTy) && hasRestrictedGEPTypes)
if (ConstantUInt *C = dyn_cast<ConstantUInt>(Idx.back()))
Idx[Idx.size()-1] = ConstantExpr::getCast(C, Type::UIntTy);
NextTy = GetElementPtrInst::getIndexedType(InstTy, Idx, true);
}
Result = new GetElementPtrInst(getValue(iType, Oprnds[0]), Idx);
break;
}
case 62: // volatile load
case Instruction::Load:
if (Oprnds.size() != 1 || !isa<PointerType>(InstTy))
PARSE_ERROR("Invalid load instruction!");
Result = new LoadInst(getValue(iType, Oprnds[0]), "", Opcode == 62);
break;
case 63: // volatile store
case Instruction::Store: {
if (!isa<PointerType>(InstTy) || Oprnds.size() != 2)
PARSE_ERROR("Invalid store instruction!");
Value *Ptr = getValue(iType, Oprnds[1]);
const Type *ValTy = cast<PointerType>(Ptr->getType())->getElementType();
Result = new StoreInst(getValue(getTypeSlot(ValTy), Oprnds[0]), Ptr,
Opcode == 63);
break;
}
case Instruction::Unwind:
if (Oprnds.size() != 0) PARSE_ERROR("Invalid unwind instruction!");
Result = new UnwindInst();
break;
} // end switch(Opcode)
unsigned TypeSlot;
if (Result->getType() == InstTy)
TypeSlot = iType;
else
TypeSlot = getTypeSlot(Result->getType());
insertValue(Result, TypeSlot, FunctionValues);
BB->getInstList().push_back(Result);
}
/// getBasicBlock - Get a particular numbered basic block, which might be a
/// forward reference. This works together with ParseBasicBlock to handle these
/// forward references in a clean manner.
BasicBlock *BytecodeReader::getBasicBlock(unsigned ID) {
// Make sure there is room in the table...
if (ParsedBasicBlocks.size() <= ID) ParsedBasicBlocks.resize(ID+1);
// First check to see if this is a backwards reference, i.e., ParseBasicBlock
// has already created this block, or if the forward reference has already
// been created.
if (ParsedBasicBlocks[ID])
return ParsedBasicBlocks[ID];
// Otherwise, the basic block has not yet been created. Do so and add it to
// the ParsedBasicBlocks list.
return ParsedBasicBlocks[ID] = new BasicBlock();
}
/// ParseBasicBlock - In LLVM 1.0 bytecode files, we used to output one
/// basicblock at a time. This method reads in one of the basicblock packets.
BasicBlock *BytecodeReader::ParseBasicBlock( unsigned BlockNo) {
HANDLE(BasicBlockBegin( BlockNo ));
BasicBlock *BB = 0;
if (ParsedBasicBlocks.size() == BlockNo)
ParsedBasicBlocks.push_back(BB = new BasicBlock());
else if (ParsedBasicBlocks[BlockNo] == 0)
BB = ParsedBasicBlocks[BlockNo] = new BasicBlock();
else
BB = ParsedBasicBlocks[BlockNo];
std::vector<unsigned> Operands;
while ( moreInBlock() )
ParseInstruction(Operands, BB);
HANDLE(BasicBlockEnd( BlockNo ));
return BB;
}
/// ParseInstructionList - Parse all of the BasicBlock's & Instruction's in the
/// body of a function. In post 1.0 bytecode files, we no longer emit basic
/// block individually, in order to avoid per-basic-block overhead.
unsigned BytecodeReader::ParseInstructionList(Function* F) {
unsigned BlockNo = 0;
std::vector<unsigned> Args;
while ( moreInBlock() ) {
HANDLE(BasicBlockBegin( BlockNo ));
BasicBlock *BB;
if (ParsedBasicBlocks.size() == BlockNo)
ParsedBasicBlocks.push_back(BB = new BasicBlock());
else if (ParsedBasicBlocks[BlockNo] == 0)
BB = ParsedBasicBlocks[BlockNo] = new BasicBlock();
else
BB = ParsedBasicBlocks[BlockNo];
HANDLE(BasicBlockEnd( BlockNo ));
++BlockNo;
F->getBasicBlockList().push_back(BB);
// Read instructions into this basic block until we get to a terminator
while ( moreInBlock() && !BB->getTerminator())
ParseInstruction(Args, BB);
if (!BB->getTerminator())
PARSE_ERROR("Non-terminated basic block found!");
}
return BlockNo;
}
void BytecodeReader::ParseSymbolTable(Function *CurrentFunction,
SymbolTable *ST) {
HANDLE(SymbolTableBegin(CurrentFunction,ST));
// Allow efficient basic block lookup by number.
std::vector<BasicBlock*> BBMap;
if (CurrentFunction)
for (Function::iterator I = CurrentFunction->begin(),
E = CurrentFunction->end(); I != E; ++I)
BBMap.push_back(I);
while ( moreInBlock() ) {
// Symtab block header: [num entries][type id number]
unsigned NumEntries = read_vbr_uint();
unsigned Typ = read_vbr_uint();
const Type *Ty = getType(Typ);
for (unsigned i = 0; i != NumEntries; ++i) {
// Symtab entry: [def slot #][name]
unsigned slot = read_vbr_uint();
std::string Name = read_str();
Value *V = 0;
if (Typ == Type::TypeTyID)
V = (Value*)getType(slot);
else if (Typ == Type::LabelTyID) {
if (slot < BBMap.size())
V = BBMap[slot];
} else {
V = getValue(Typ, slot, false); // Find mapping...
}
if (V == 0)
PARSE_ERROR("Failed value look-up for name '" << Name << "'");
V->setName(Name, ST);
}
}
checkPastBlockEnd("Symbol Table");
HANDLE(SymbolTableEnd());
}
void BytecodeReader::ParseCompactionTable() {
HANDLE(CompactionTableBegin());
while ( moreInBlock() ) {
unsigned NumEntries = read_vbr_uint();
unsigned Ty;
if ((NumEntries & 3) == 3) {
NumEntries >>= 2;
Ty = read_vbr_uint();
} else {
Ty = NumEntries >> 2;
NumEntries &= 3;
}
if (Ty >= CompactionValues.size())
CompactionValues.resize(Ty+1);
if (!CompactionValues[Ty].empty())
PARSE_ERROR("Compaction table plane contains multiple entries!");
HANDLE(CompactionTablePlane( Ty, NumEntries ));
if (Ty == Type::TypeTyID) {
for (unsigned i = 0; i != NumEntries; ++i) {
unsigned TypeSlot = read_vbr_uint();
const Type *Typ = getGlobalTableType(TypeSlot);
CompactionTypes.push_back(Typ);
HANDLE(CompactionTableType( i, TypeSlot, Typ ));
}
CompactionTypes.resize(NumEntries+Type::FirstDerivedTyID);
} else {
const Type *Typ = getType(Ty);
// Push the implicit zero
CompactionValues[Ty].push_back(Constant::getNullValue(Typ));
for (unsigned i = 0; i != NumEntries; ++i) {
unsigned ValSlot = read_vbr_uint();
Value *V = getGlobalTableValue(Typ, ValSlot);
CompactionValues[Ty].push_back(V);
HANDLE(CompactionTableValue( i, Ty, ValSlot, Typ ));
}
}
}
HANDLE(CompactionTableEnd());
}
// Parse a single type constant.
const Type *BytecodeReader::ParseTypeConstant() {
unsigned PrimType = read_vbr_uint();
const Type *Result = 0;
if ((Result = Type::getPrimitiveType((Type::TypeID)PrimType)))
return Result;
switch (PrimType) {
case Type::FunctionTyID: {
const Type *RetType = getType(read_vbr_uint());
unsigned NumParams = read_vbr_uint();
std::vector<const Type*> Params;
while (NumParams--)
Params.push_back(getType(read_vbr_uint()));
bool isVarArg = Params.size() && Params.back() == Type::VoidTy;
if (isVarArg) Params.pop_back();
Result = FunctionType::get(RetType, Params, isVarArg);
break;
}
case Type::ArrayTyID: {
unsigned ElTyp = read_vbr_uint();
const Type *ElementType = getType(ElTyp);
unsigned NumElements = read_vbr_uint();
Result = ArrayType::get(ElementType, NumElements);
break;
}
case Type::StructTyID: {
std::vector<const Type*> Elements;
unsigned Typ = read_vbr_uint();
while (Typ) { // List is terminated by void/0 typeid
Elements.push_back(getType(Typ));
Typ = read_vbr_uint();
}
Result = StructType::get(Elements);
break;
}
case Type::PointerTyID: {
unsigned ElTyp = read_vbr_uint();
Result = PointerType::get(getType(ElTyp));
break;
}
case Type::OpaqueTyID: {
Result = OpaqueType::get();
break;
}
default:
PARSE_ERROR("Don't know how to deserialize primitive type" << PrimType << "\n");
break;
}
HANDLE(Type( Result ));
return Result;
}
// 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 BytecodeReader::ParseTypeConstants(TypeListTy &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...
Tab.reserve(NumEntries);
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(), *OldTy = Tab[i].get();
if (NewTy == 0) PARSE_ERROR("Couldn't parse type!");
// Don't directly push the new type on the Tab. Instead we want to replace
// the opaque type we previously inserted with the new concrete value. This
// approach helps with forward references to types. The refinement from the
// abstract (opaque) type to the new type causes all uses of the abstract
// type to use the concrete type (NewTy). This will also cause the opaque
// type to be deleted.
cast<DerivedType>(const_cast<Type*>(OldTy))->refineAbstractTypeTo(NewTy);
// This should have replaced the old opaque type with the new type in the
// value table... or with a preexisting type that was already in the system.
// Let's just make sure it did.
assert(Tab[i] != OldTy && "refineAbstractType didn't work!");
}
}
Constant *BytecodeReader::ParseConstantValue( unsigned TypeID) {
// We must check for a ConstantExpr before switching by type because
// a ConstantExpr can be of any type, and has no explicit value.
//
// 0 if not expr; numArgs if is expr
unsigned isExprNumArgs = read_vbr_uint();
if (isExprNumArgs) {
// FIXME: Encoding of constant exprs could be much more compact!
std::vector<Constant*> ArgVec;
ArgVec.reserve(isExprNumArgs);
unsigned Opcode = read_vbr_uint();
// Read the slot number and types of each of the arguments
for (unsigned i = 0; i != isExprNumArgs; ++i) {
unsigned ArgValSlot = read_vbr_uint();
unsigned ArgTypeSlot = read_vbr_uint();
// Get the arg value from its slot if it exists, otherwise a placeholder
ArgVec.push_back(getConstantValue(ArgTypeSlot, ArgValSlot));
}
// Construct a ConstantExpr of the appropriate kind
if (isExprNumArgs == 1) { // All one-operand expressions
assert(Opcode == Instruction::Cast);
Constant* Result = ConstantExpr::getCast(ArgVec[0], getType(TypeID));
HANDLE(ConstantExpression(Opcode, ArgVec, Result));
return Result;
} else if (Opcode == Instruction::GetElementPtr) { // GetElementPtr
std::vector<Constant*> IdxList(ArgVec.begin()+1, ArgVec.end());
if (hasRestrictedGEPTypes) {
const Type *BaseTy = ArgVec[0]->getType();
generic_gep_type_iterator<std::vector<Constant*>::iterator>
GTI = gep_type_begin(BaseTy, IdxList.begin(), IdxList.end()),
E = gep_type_end(BaseTy, IdxList.begin(), IdxList.end());
for (unsigned i = 0; GTI != E; ++GTI, ++i)
if (isa<StructType>(*GTI)) {
if (IdxList[i]->getType() != Type::UByteTy)
PARSE_ERROR("Invalid index for getelementptr!");
IdxList[i] = ConstantExpr::getCast(IdxList[i], Type::UIntTy);
}
}
Constant* Result = ConstantExpr::getGetElementPtr(ArgVec[0], IdxList);
HANDLE(ConstantExpression(Opcode, ArgVec, Result));
return Result;
} else if (Opcode == Instruction::Select) {
assert(ArgVec.size() == 3);
Constant* Result = ConstantExpr::getSelect(ArgVec[0], ArgVec[1],
ArgVec[2]);
HANDLE(ConstantExpression(Opcode, ArgVec, Result));
return Result;
} else { // All other 2-operand expressions
Constant* Result = ConstantExpr::get(Opcode, ArgVec[0], ArgVec[1]);
HANDLE(ConstantExpression(Opcode, ArgVec, Result));
return Result;
}
}
// Ok, not an ConstantExpr. We now know how to read the given type...
const Type *Ty = getType(TypeID);
switch (Ty->getTypeID()) {
case Type::BoolTyID: {
unsigned Val = read_vbr_uint();
if (Val != 0 && Val != 1)
PARSE_ERROR("Invalid boolean value read.");
Constant* Result = ConstantBool::get(Val == 1);
HANDLE(ConstantValue(Result));
return Result;
}
case Type::UByteTyID: // Unsigned integer types...
case Type::UShortTyID:
case Type::UIntTyID: {
unsigned Val = read_vbr_uint();
if (!ConstantUInt::isValueValidForType(Ty, Val))
PARSE_ERROR("Invalid unsigned byte/short/int read.");
Constant* Result = ConstantUInt::get(Ty, Val);
HANDLE(ConstantValue(Result));
return Result;
}
case Type::ULongTyID: {
Constant* Result = ConstantUInt::get(Ty, read_vbr_uint64());
HANDLE(ConstantValue(Result));
return Result;
}
case Type::SByteTyID: // Signed integer types...
case Type::ShortTyID:
case Type::IntTyID: {
case Type::LongTyID:
int64_t Val = read_vbr_int64();
if (!ConstantSInt::isValueValidForType(Ty, Val))
PARSE_ERROR("Invalid signed byte/short/int/long read.");
Constant* Result = ConstantSInt::get(Ty, Val);
HANDLE(ConstantValue(Result));
return Result;
}
case Type::FloatTyID: {
float F;
read_data(&F, &F+1);
Constant* Result = ConstantFP::get(Ty, F);
HANDLE(ConstantValue(Result));
return Result;
}
case Type::DoubleTyID: {
double Val;
read_data(&Val, &Val+1);
Constant* Result = ConstantFP::get(Ty, Val);
HANDLE(ConstantValue(Result));
return Result;
}
case Type::TypeTyID:
PARSE_ERROR("Type constants shouldn't live in constant table!");
break;
case Type::ArrayTyID: {
const ArrayType *AT = cast<ArrayType>(Ty);
unsigned NumElements = AT->getNumElements();
unsigned TypeSlot = getTypeSlot(AT->getElementType());
std::vector<Constant*> Elements;
Elements.reserve(NumElements);
while (NumElements--) // Read all of the elements of the constant.
Elements.push_back(getConstantValue(TypeSlot,
read_vbr_uint()));
Constant* Result = ConstantArray::get(AT, Elements);
HANDLE(ConstantArray(AT, Elements, TypeSlot, Result));
return Result;
}
case Type::StructTyID: {
const StructType *ST = cast<StructType>(Ty);
std::vector<Constant *> Elements;
Elements.reserve(ST->getNumElements());
for (unsigned i = 0; i != ST->getNumElements(); ++i)
Elements.push_back(getConstantValue(ST->getElementType(i),
read_vbr_uint()));
Constant* Result = ConstantStruct::get(ST, Elements);
HANDLE(ConstantStruct(ST, Elements, Result));
return Result;
}
case Type::PointerTyID: { // ConstantPointerRef value...
const PointerType *PT = cast<PointerType>(Ty);
unsigned Slot = read_vbr_uint();
// Check to see if we have already read this global variable...
Value *Val = getValue(TypeID, Slot, false);
GlobalValue *GV;
if (Val) {
if (!(GV = dyn_cast<GlobalValue>(Val)))
PARSE_ERROR("Value of ConstantPointerRef not in ValueTable!");
} else {
PARSE_ERROR("Forward references are not allowed here.");
}
Constant* Result = ConstantPointerRef::get(GV);
HANDLE(ConstantPointer(PT, Slot, GV, Result));
return Result;
}
default:
PARSE_ERROR("Don't know how to deserialize constant value of type '"+
Ty->getDescription());
break;
}
}
void BytecodeReader::ResolveReferencesToConstant(Constant *NewV, unsigned Slot){
ConstantRefsType::iterator I =
ConstantFwdRefs.find(std::make_pair(NewV->getType(), Slot));
if (I == ConstantFwdRefs.end()) return; // Never forward referenced?
Value *PH = I->second; // Get the placeholder...
PH->replaceAllUsesWith(NewV);
delete PH; // Delete the old placeholder
ConstantFwdRefs.erase(I); // Remove the map entry for it
}
void BytecodeReader::ParseStringConstants(unsigned NumEntries, ValueTable &Tab){
for (; NumEntries; --NumEntries) {
unsigned Typ = read_vbr_uint();
const Type *Ty = getType(Typ);
if (!isa<ArrayType>(Ty))
PARSE_ERROR("String constant data invalid!");
const ArrayType *ATy = cast<ArrayType>(Ty);
if (ATy->getElementType() != Type::SByteTy &&
ATy->getElementType() != Type::UByteTy)
PARSE_ERROR("String constant data invalid!");
// Read character data. The type tells us how long the string is.
char Data[ATy->getNumElements()];
read_data(Data, Data+ATy->getNumElements());
std::vector<Constant*> Elements(ATy->getNumElements());
if (ATy->getElementType() == Type::SByteTy)
for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i)
Elements[i] = ConstantSInt::get(Type::SByteTy, (signed char)Data[i]);
else
for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i)
Elements[i] = ConstantUInt::get(Type::UByteTy, (unsigned char)Data[i]);
// Create the constant, inserting it as needed.
Constant *C = ConstantArray::get(ATy, Elements);
unsigned Slot = insertValue(C, Typ, Tab);
ResolveReferencesToConstant(C, Slot);
HANDLE(ConstantString(cast<ConstantArray>(C)));
}
}
void BytecodeReader::ParseConstantPool(ValueTable &Tab,
TypeListTy &TypeTab) {
HANDLE(GlobalConstantsBegin());
while ( moreInBlock() ) {
unsigned NumEntries = read_vbr_uint();
unsigned Typ = read_vbr_uint();
if (Typ == Type::TypeTyID) {
ParseTypeConstants(TypeTab, NumEntries);
} else if (Typ == Type::VoidTyID) {
assert(&Tab == &ModuleValues && "Cannot read strings in functions!");
ParseStringConstants(NumEntries, Tab);
} else {
for (unsigned i = 0; i < NumEntries; ++i) {
Constant *C = ParseConstantValue(Typ);
assert(C && "ParseConstantValue returned NULL!");
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() &&
ModuleValues[Typ])
Slot += ModuleValues[Typ]->size();
ResolveReferencesToConstant(C, Slot);
}
}
}
checkPastBlockEnd("Constant Pool");
HANDLE(GlobalConstantsEnd());
}
void BytecodeReader::ParseFunctionBody(Function* F ) {
unsigned FuncSize = BlockEnd - At;
GlobalValue::LinkageTypes Linkage = GlobalValue::ExternalLinkage;
unsigned LinkageType = read_vbr_uint();
switch (LinkageType) {
case 0: Linkage = GlobalValue::ExternalLinkage; break;
case 1: Linkage = GlobalValue::WeakLinkage; break;
case 2: Linkage = GlobalValue::AppendingLinkage; break;
case 3: Linkage = GlobalValue::InternalLinkage; break;
case 4: Linkage = GlobalValue::LinkOnceLinkage; break;
default:
PARSE_ERROR("Invalid linkage type for Function.");
Linkage = GlobalValue::InternalLinkage;
break;
}
F->setLinkage( Linkage );
HANDLE(FunctionBegin(F,FuncSize));
// Keep track of how many basic blocks we have read in...
unsigned BlockNum = 0;
bool InsertedArguments = false;
BufPtr MyEnd = BlockEnd;
while ( At < MyEnd ) {
unsigned Type, Size;
BufPtr OldAt = At;
read_block(Type, Size);
switch (Type) {
case BytecodeFormat::ConstantPool:
if (!InsertedArguments) {
// Insert arguments into the value table before we parse the first basic
// block in the function, but after we potentially read in the
// compaction table.
insertArguments(F);
InsertedArguments = true;
}
ParseConstantPool(FunctionValues, FunctionTypes);
break;
case BytecodeFormat::CompactionTable:
ParseCompactionTable();
break;
case BytecodeFormat::BasicBlock: {
if (!InsertedArguments) {
// Insert arguments into the value table before we parse the first basic
// block in the function, but after we potentially read in the
// compaction table.
insertArguments(F);
InsertedArguments = true;
}
BasicBlock *BB = ParseBasicBlock(BlockNum++);
F->getBasicBlockList().push_back(BB);
break;
}
case BytecodeFormat::InstructionList: {
// Insert arguments into the value table before we parse the instruction
// list for the function, but after we potentially read in the compaction
// table.
if (!InsertedArguments) {
insertArguments(F);
InsertedArguments = true;
}
if (BlockNum)
PARSE_ERROR("Already parsed basic blocks!");
BlockNum = ParseInstructionList(F);
break;
}
case BytecodeFormat::SymbolTable:
ParseSymbolTable(F, &F->getSymbolTable());
break;
default:
At += Size;
if (OldAt > At)
PARSE_ERROR("Wrapped around reading bytecode.");
break;
}
BlockEnd = MyEnd;
// Malformed bc file if read past end of block.
align32();
}
// Make sure there were no references to non-existant basic blocks.
if (BlockNum != ParsedBasicBlocks.size())
PARSE_ERROR("Illegal basic block operand reference");
ParsedBasicBlocks.clear();
// Resolve forward references. Replace any uses of a forward reference value
// with the real value.
// replaceAllUsesWith is very inefficient for instructions which have a LARGE
// number of operands. PHI nodes often have forward references, and can also
// often have a very large number of operands.
//
// FIXME: REEVALUATE. replaceAllUsesWith is _much_ faster now, and this code
// should be simplified back to using it!
//
std::map<Value*, Value*> ForwardRefMapping;
for (std::map<std::pair<unsigned,unsigned>, Value*>::iterator
I = ForwardReferences.begin(), E = ForwardReferences.end();
I != E; ++I)
ForwardRefMapping[I->second] = getValue(I->first.first, I->first.second,
false);
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
if (Argument *A = dyn_cast<Argument>(I->getOperand(i))) {
std::map<Value*, Value*>::iterator It = ForwardRefMapping.find(A);
if (It != ForwardRefMapping.end()) I->setOperand(i, It->second);
}
while (!ForwardReferences.empty()) {
std::map<std::pair<unsigned,unsigned>, Value*>::iterator I =
ForwardReferences.begin();
Value *PlaceHolder = I->second;
ForwardReferences.erase(I);
// Now that all the uses are gone, delete the placeholder...
// If we couldn't find a def (error case), then leak a little
// memory, because otherwise we can't remove all uses!
delete PlaceHolder;
}
// Clear out function-level types...
FunctionTypes.clear();
CompactionTypes.clear();
CompactionValues.clear();
freeTable(FunctionValues);
HANDLE(FunctionEnd(F));
}
void BytecodeReader::ParseFunctionLazily() {
if (FunctionSignatureList.empty())
PARSE_ERROR("FunctionSignatureList empty!");
Function *Func = FunctionSignatureList.back();
FunctionSignatureList.pop_back();
// Save the information for future reading of the function
LazyFunctionLoadMap[Func] = LazyFunctionInfo(BlockStart, BlockEnd);
// Pretend we've `parsed' this function
At = BlockEnd;
}
void BytecodeReader::ParseFunction(Function* Func) {
// Find {start, end} pointers and slot in the map. If not there, we're done.
LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.find(Func);
// Make sure we found it
if ( Fi == LazyFunctionLoadMap.end() ) {
PARSE_ERROR("Unrecognized function of type " << Func->getType()->getDescription());
return;
}
BlockStart = At = Fi->second.Buf;
BlockEnd = Fi->second.EndBuf;
assert(Fi->first == Func);
LazyFunctionLoadMap.erase(Fi);
this->ParseFunctionBody( Func );
}
void BytecodeReader::ParseAllFunctionBodies() {
LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.begin();
LazyFunctionMap::iterator Fe = LazyFunctionLoadMap.end();
while ( Fi != Fe ) {
Function* Func = Fi->first;
BlockStart = At = Fi->second.Buf;
BlockEnd = Fi->second.EndBuf;
this->ParseFunctionBody(Func);
++Fi;
}
}
void BytecodeReader::ParseGlobalTypes() {
ValueTable T;
ParseConstantPool(T, ModuleTypes);
}
void BytecodeReader::ParseModuleGlobalInfo() {
HANDLE(ModuleGlobalsBegin());
// Read global variables...
unsigned VarType = read_vbr_uint();
while (VarType != Type::VoidTyID) { // List is terminated by Void
// VarType Fields: bit0 = isConstant, bit1 = hasInitializer, bit2,3,4 =
// Linkage, bit4+ = slot#
unsigned SlotNo = VarType >> 5;
unsigned LinkageID = (VarType >> 2) & 7;
bool isConstant = VarType & 1;
bool hasInitializer = VarType & 2;
GlobalValue::LinkageTypes Linkage;
switch (LinkageID) {
case 0: Linkage = GlobalValue::ExternalLinkage; break;
case 1: Linkage = GlobalValue::WeakLinkage; break;
case 2: Linkage = GlobalValue::AppendingLinkage; break;
case 3: Linkage = GlobalValue::InternalLinkage; break;
case 4: Linkage = GlobalValue::LinkOnceLinkage; break;
default:
PARSE_ERROR("Unknown linkage type: " << LinkageID);
Linkage = GlobalValue::InternalLinkage;
break;
}
const Type *Ty = getType(SlotNo);
if ( !Ty ) {
PARSE_ERROR("Global has no type! SlotNo=" << SlotNo);
}
if ( !isa<PointerType>(Ty)) {
PARSE_ERROR("Global not a pointer type! Ty= " << Ty->getDescription());
}
const Type *ElTy = cast<PointerType>(Ty)->getElementType();
// Create the global variable...
GlobalVariable *GV = new GlobalVariable(ElTy, isConstant, Linkage,
0, "", TheModule);
insertValue(GV, SlotNo, ModuleValues);
unsigned initSlot = 0;
if (hasInitializer) {
initSlot = read_vbr_uint();
GlobalInits.push_back(std::make_pair(GV, initSlot));
}
// Notify handler about the global value.
HANDLE(GlobalVariable( ElTy, isConstant, Linkage, SlotNo, initSlot ));
// Get next item
VarType = read_vbr_uint();
}
// Read the function objects for all of the functions that are coming
unsigned FnSignature = read_vbr_uint();
while (FnSignature != Type::VoidTyID) { // List is terminated by Void
const Type *Ty = getType(FnSignature);
if (!isa<PointerType>(Ty) ||
!isa<FunctionType>(cast<PointerType>(Ty)->getElementType())) {
PARSE_ERROR( "Function not a pointer to function type! Ty = " +
Ty->getDescription());
// FIXME: what should Ty be if handler continues?
}
// We create functions by passing the underlying FunctionType to create...
const FunctionType* FTy =
cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
// Insert the place hodler
Function* Func = new Function(FTy, GlobalValue::InternalLinkage,
"", TheModule);
insertValue(Func, FnSignature, ModuleValues);
// Save this for later so we know type of lazily instantiated functions
FunctionSignatureList.push_back(Func);
HANDLE(FunctionDeclaration(Func));
// Get Next function signature
FnSignature = read_vbr_uint();
}
if (hasInconsistentModuleGlobalInfo)
align32();
// Now that the function signature list is set up, reverse it so that we can
// remove elements efficiently from the back of the vector.
std::reverse(FunctionSignatureList.begin(), FunctionSignatureList.end());
// This is for future proofing... in the future extra fields may be added that
// we don't understand, so we transparently ignore them.
//
At = BlockEnd;
HANDLE(ModuleGlobalsEnd());
}
void BytecodeReader::ParseVersionInfo() {
unsigned Version = read_vbr_uint();
// Unpack version number: low four bits are for flags, top bits = version
Module::Endianness Endianness;
Module::PointerSize PointerSize;
Endianness = (Version & 1) ? Module::BigEndian : Module::LittleEndian;
PointerSize = (Version & 2) ? Module::Pointer64 : Module::Pointer32;
bool hasNoEndianness = Version & 4;
bool hasNoPointerSize = Version & 8;
RevisionNum = Version >> 4;
// Default values for the current bytecode version
hasInconsistentModuleGlobalInfo = false;
hasExplicitPrimitiveZeros = false;
hasRestrictedGEPTypes = false;
switch (RevisionNum) {
case 0: // LLVM 1.0, 1.1 release version
// Base LLVM 1.0 bytecode format.
hasInconsistentModuleGlobalInfo = true;
hasExplicitPrimitiveZeros = true;
// FALL THROUGH
case 1: // LLVM 1.2 release version
// LLVM 1.2 added explicit support for emitting strings efficiently.
// Also, it fixed the problem where the size of the ModuleGlobalInfo block
// included the size for the alignment at the end, where the rest of the
// blocks did not.
// LLVM 1.2 and before required that GEP indices be ubyte constants for
// structures and longs for sequential types.
hasRestrictedGEPTypes = true;
// FALL THROUGH
case 2: // LLVM 1.3 release version
break;
default:
PARSE_ERROR("Unknown bytecode version number: " << RevisionNum);
}
if (hasNoEndianness) Endianness = Module::AnyEndianness;
if (hasNoPointerSize) PointerSize = Module::AnyPointerSize;
HANDLE(VersionInfo(RevisionNum, Endianness, PointerSize ));
}
void BytecodeReader::ParseModule() {
unsigned Type, Size;
FunctionSignatureList.clear(); // Just in case...
// Read into instance variables...
ParseVersionInfo();
align32(); /// FIXME: Is this redundant? VI is first and 4 bytes!
bool SeenModuleGlobalInfo = false;
bool SeenGlobalTypePlane = false;
BufPtr MyEnd = BlockEnd;
while (At < MyEnd) {
BufPtr OldAt = At;
read_block(Type, Size);
switch (Type) {
case BytecodeFormat::GlobalTypePlane:
if ( SeenGlobalTypePlane )
PARSE_ERROR("Two GlobalTypePlane Blocks Encountered!");
ParseGlobalTypes();
SeenGlobalTypePlane = true;
break;
case BytecodeFormat::ModuleGlobalInfo:
if ( SeenModuleGlobalInfo )
PARSE_ERROR("Two ModuleGlobalInfo Blocks Encountered!");
ParseModuleGlobalInfo();
SeenModuleGlobalInfo = true;
break;
case BytecodeFormat::ConstantPool:
ParseConstantPool(ModuleValues, ModuleTypes);
break;
case BytecodeFormat::Function:
ParseFunctionLazily();
break;
case BytecodeFormat::SymbolTable:
ParseSymbolTable(0, &TheModule->getSymbolTable());
break;
default:
At += Size;
if (OldAt > At) {
PARSE_ERROR("Unexpected Block of Type" << Type << "encountered!" );
}
break;
}
BlockEnd = MyEnd;
align32();
}
// After the module constant pool has been read, we can safely initialize
// global variables...
while (!GlobalInits.empty()) {
GlobalVariable *GV = GlobalInits.back().first;
unsigned Slot = GlobalInits.back().second;
GlobalInits.pop_back();
// Look up the initializer value...
// FIXME: Preserve this type ID!
const llvm::PointerType* GVType = GV->getType();
unsigned TypeSlot = getTypeSlot(GVType->getElementType());
if (Constant *CV = getConstantValue(TypeSlot, Slot)) {
if (GV->hasInitializer())
PARSE_ERROR("Global *already* has an initializer?!");
HANDLE(GlobalInitializer(GV,CV));
GV->setInitializer(CV);
} else
PARSE_ERROR("Cannot find initializer value.");
}
/// Make sure we pulled them all out. If we didn't then there's a declaration
/// but a missing body. That's not allowed.
if (!FunctionSignatureList.empty())
PARSE_ERROR(
"Function declared, but bytecode stream ended before definition");
}
void BytecodeReader::ParseBytecode(
BufPtr Buf, unsigned Length,
const std::string &ModuleID) {
try {
At = MemStart = BlockStart = Buf;
MemEnd = BlockEnd = Buf + Length;
// Create the module
TheModule = new Module(ModuleID);
HANDLE(Start(TheModule, Length));
// Read and check signature...
unsigned Sig = read_uint();
if (Sig != ('l' | ('l' << 8) | ('v' << 16) | ('m' << 24))) {
PARSE_ERROR("Invalid bytecode signature: " << Sig);
}
// Tell the handler we're starting a module
HANDLE(ModuleBegin(ModuleID));
// Get the module block and size and verify
unsigned Type, Size;
read_block(Type, Size);
if ( Type != BytecodeFormat::Module ) {
PARSE_ERROR("Expected Module Block! At: " << unsigned(intptr_t(At))
<< ", Type:" << Type << ", Size:" << Size);
}
if ( At + Size != MemEnd ) {
PARSE_ERROR("Invalid Top Level Block Length! At: "
<< unsigned(intptr_t(At)) << ", Type:" << Type << ", Size:" << Size);
}
// Parse the module contents
this->ParseModule();
// Tell the handler we're done
HANDLE(ModuleEnd(ModuleID));
// Check for missing functions
if ( hasFunctions() )
PARSE_ERROR("Function expected, but bytecode stream ended!");
// Tell the handler we're
HANDLE(Finish());
} catch (std::string& errstr ) {
HANDLE(Error(errstr));
freeState();
delete TheModule;
TheModule = 0;
throw;
} catch (...) {
std::string msg("Unknown Exception Occurred");
HANDLE(Error(msg));
freeState();
delete TheModule;
TheModule = 0;
throw msg;
}
}
//===----------------------------------------------------------------------===//
//=== Default Implementations of Handler Methods
//===----------------------------------------------------------------------===//
BytecodeHandler::~BytecodeHandler() {}
void BytecodeHandler::handleError(const std::string& str ) { }
void BytecodeHandler::handleStart(Module*m, unsigned Length ) { }
void BytecodeHandler::handleFinish() { }
void BytecodeHandler::handleModuleBegin(const std::string& id) { }
void BytecodeHandler::handleModuleEnd(const std::string& id) { }
void BytecodeHandler::handleVersionInfo( unsigned char RevisionNum,
Module::Endianness Endianness, Module::PointerSize PointerSize) { }
void BytecodeHandler::handleModuleGlobalsBegin() { }
void BytecodeHandler::handleGlobalVariable(
const Type* ElemType, bool isConstant, GlobalValue::LinkageTypes,
unsigned SlotNo, unsigned initSlot ) { }
void BytecodeHandler::handleType( const Type* Ty ) {}
void BytecodeHandler::handleFunctionDeclaration(
Function* Func ) {}
void BytecodeHandler::handleGlobalInitializer(GlobalVariable*, Constant* ) {}
void BytecodeHandler::handleModuleGlobalsEnd() { }
void BytecodeHandler::handleCompactionTableBegin() { }
void BytecodeHandler::handleCompactionTablePlane(
unsigned Ty, unsigned NumEntries) {}
void BytecodeHandler::handleCompactionTableType(
unsigned i, unsigned TypSlot, const Type* ) {}
void BytecodeHandler::handleCompactionTableValue(
unsigned i, unsigned TypSlot, unsigned ValSlot, const Type* ) {}
void BytecodeHandler::handleCompactionTableEnd() { }
void BytecodeHandler::handleSymbolTableBegin(Function*, SymbolTable*) { }
void BytecodeHandler::handleSymbolTablePlane( unsigned Ty, unsigned NumEntries,
const Type* Typ) { }
void BytecodeHandler::handleSymbolTableType( unsigned i, unsigned slot,
const std::string& name ) { }
void BytecodeHandler::handleSymbolTableValue( unsigned i, unsigned slot,
const std::string& name ) { }
void BytecodeHandler::handleSymbolTableEnd() { }
void BytecodeHandler::handleFunctionBegin( Function* Func,
unsigned Size ) {}
void BytecodeHandler::handleFunctionEnd( Function* Func) { }
void BytecodeHandler::handleBasicBlockBegin( unsigned blocknum) { }
bool BytecodeHandler::handleInstruction( unsigned Opcode, const Type* iType,
std::vector<unsigned>& Operands, unsigned Size) {
return Instruction::isTerminator(Opcode);
}
void BytecodeHandler::handleBasicBlockEnd(unsigned blocknum) { }
void BytecodeHandler::handleGlobalConstantsBegin() { }
void BytecodeHandler::handleConstantExpression( unsigned Opcode,
std::vector<Constant*> ArgVec, Constant* Val) { }
void BytecodeHandler::handleConstantValue( Constant * c ) { }
void BytecodeHandler::handleConstantArray( const ArrayType* AT,
std::vector<Constant*>& Elements, unsigned TypeSlot, Constant* Val ) { }
void BytecodeHandler::handleConstantStruct( const StructType* ST,
std::vector<Constant*>& ElementSlots, Constant* Val ) { }
void BytecodeHandler::handleConstantPointer(
const PointerType* PT, unsigned TypeSlot, GlobalValue*, Constant* Val) { }
void BytecodeHandler::handleConstantString( const ConstantArray* CA ) {}
void BytecodeHandler::handleGlobalConstantsEnd() {}
void BytecodeHandler::handleAlignment(unsigned numBytes) {}
void BytecodeHandler::handleBlock(
unsigned BType, const unsigned char* StartPtr, unsigned Size) {}
void BytecodeHandler::handleVBR32(unsigned Size ) {}
void BytecodeHandler::handleVBR64(unsigned Size ) {}
// vim: sw=2
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