std::vector<PATypeHolder>().swap(TypeList);
ValueList.clear();
- std::vector<PAListPtr>().swap(ParamAttrs);
+ std::vector<AttrListPtr>().swap(MAttributes);
std::vector<BasicBlock*>().swap(FunctionBBs);
std::vector<Function*>().swap(FunctionsWithBodies);
DeferredFunctionInfo.clear();
: ConstantExpr(Ty, Instruction::UserOp1, &Op<0>(), 1) {
Op<0>() = UndefValue::get(Type::Int32Ty);
}
+
+ /// @brief Methods to support type inquiry through isa, cast, and dyn_cast.
+ static inline bool classof(const ConstantPlaceHolder *) { return true; }
+ static bool classof(const Value *V) {
+ return isa<ConstantExpr>(V) &&
+ cast<ConstantExpr>(V)->getOpcode() == Instruction::UserOp1;
+ }
+
+
/// Provide fast operand accessors
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
};
return V;
}
+/// ResolveConstantForwardRefs - Once all constants are read, this method bulk
+/// resolves any forward references. The idea behind this is that we sometimes
+/// get constants (such as large arrays) which reference *many* forward ref
+/// constants. Replacing each of these causes a lot of thrashing when
+/// building/reuniquing the constant. Instead of doing this, we look at all the
+/// uses and rewrite all the place holders at once for any constant that uses
+/// a placeholder.
+void BitcodeReaderValueList::ResolveConstantForwardRefs() {
+ // Sort the values by-pointer so that they are efficient to look up with a
+ // binary search.
+ std::sort(ResolveConstants.begin(), ResolveConstants.end());
+
+ SmallVector<Constant*, 64> NewOps;
+
+ while (!ResolveConstants.empty()) {
+ Value *RealVal = getOperand(ResolveConstants.back().second);
+ Constant *Placeholder = ResolveConstants.back().first;
+ ResolveConstants.pop_back();
+
+ // Loop over all users of the placeholder, updating them to reference the
+ // new value. If they reference more than one placeholder, update them all
+ // at once.
+ while (!Placeholder->use_empty()) {
+ Value::use_iterator UI = Placeholder->use_begin();
+
+ // If the using object isn't uniqued, just update the operands. This
+ // handles instructions and initializers for global variables.
+ if (!isa<Constant>(*UI) || isa<GlobalValue>(*UI)) {
+ UI.getUse().set(RealVal);
+ continue;
+ }
+
+ // Otherwise, we have a constant that uses the placeholder. Replace that
+ // constant with a new constant that has *all* placeholder uses updated.
+ Constant *UserC = cast<Constant>(*UI);
+ for (User::op_iterator I = UserC->op_begin(), E = UserC->op_end();
+ I != E; ++I) {
+ Value *NewOp;
+ if (!isa<ConstantPlaceHolder>(*I)) {
+ // Not a placeholder reference.
+ NewOp = *I;
+ } else if (*I == Placeholder) {
+ // Common case is that it just references this one placeholder.
+ NewOp = RealVal;
+ } else {
+ // Otherwise, look up the placeholder in ResolveConstants.
+ ResolveConstantsTy::iterator It =
+ std::lower_bound(ResolveConstants.begin(), ResolveConstants.end(),
+ std::pair<Constant*, unsigned>(cast<Constant>(*I),
+ 0));
+ assert(It != ResolveConstants.end() && It->first == *I);
+ NewOp = this->getOperand(It->second);
+ }
+
+ NewOps.push_back(cast<Constant>(NewOp));
+ }
+
+ // Make the new constant.
+ Constant *NewC;
+ if (ConstantArray *UserCA = dyn_cast<ConstantArray>(UserC)) {
+ NewC = ConstantArray::get(UserCA->getType(), &NewOps[0], NewOps.size());
+ } else if (ConstantStruct *UserCS = dyn_cast<ConstantStruct>(UserC)) {
+ NewC = ConstantStruct::get(&NewOps[0], NewOps.size(),
+ UserCS->getType()->isPacked());
+ } else if (isa<ConstantVector>(UserC)) {
+ NewC = ConstantVector::get(&NewOps[0], NewOps.size());
+ } else {
+ // Must be a constant expression.
+ NewC = cast<ConstantExpr>(UserC)->getWithOperands(&NewOps[0],
+ NewOps.size());
+ }
+
+ UserC->replaceAllUsesWith(NewC);
+ UserC->destroyConstant();
+ NewOps.clear();
+ }
+
+ delete Placeholder;
+ }
+}
+
const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) {
// If the TypeID is in range, return it.
// Functions for parsing blocks from the bitcode file
//===----------------------------------------------------------------------===//
-bool BitcodeReader::ParseParamAttrBlock() {
+bool BitcodeReader::ParseAttributeBlock() {
if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
return Error("Malformed block record");
- if (!ParamAttrs.empty())
+ if (!MAttributes.empty())
return Error("Multiple PARAMATTR blocks found!");
SmallVector<uint64_t, 64> Record;
- SmallVector<ParamAttrsWithIndex, 8> Attrs;
+ SmallVector<AttributeWithIndex, 8> Attrs;
// Read all the records.
while (1) {
if (Record.size() & 1)
return Error("Invalid ENTRY record");
+ // FIXME : Remove this autoupgrade code in LLVM 3.0.
+ // If Function attributes are using index 0 then transfer them
+ // to index ~0. Index 0 is used for return value attributes but used to be
+ // used for function attributes.
+ Attributes RetAttribute = Attribute::None;
+ Attributes FnAttribute = Attribute::None;
for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
- if (Record[i+1] != ParamAttr::None)
- Attrs.push_back(ParamAttrsWithIndex::get(Record[i], Record[i+1]));
+ // FIXME: remove in LLVM 3.0
+ // The alignment is stored as a 16-bit raw value from bits 31--16.
+ // We shift the bits above 31 down by 11 bits.
+
+ unsigned Alignment = (Record[i+1] & (0xffffull << 16)) >> 16;
+ if (Alignment && !isPowerOf2_32(Alignment))
+ return Error("Alignment is not a power of two.");
+
+ Attributes ReconstitutedAttr = Record[i+1] & 0xffff;
+ if (Alignment)
+ ReconstitutedAttr |= Attribute::constructAlignmentFromInt(Alignment);
+ ReconstitutedAttr |= (Record[i+1] & (0xffffull << 32)) >> 11;
+ Record[i+1] = ReconstitutedAttr;
+
+ if (Record[i] == 0)
+ RetAttribute = Record[i+1];
+ else if (Record[i] == ~0U)
+ FnAttribute = Record[i+1];
}
- ParamAttrs.push_back(PAListPtr::get(Attrs.begin(), Attrs.end()));
+ unsigned OldRetAttrs = (Attribute::NoUnwind|Attribute::NoReturn|
+ Attribute::ReadOnly|Attribute::ReadNone);
+
+ if (FnAttribute == Attribute::None && RetAttribute != Attribute::None &&
+ (RetAttribute & OldRetAttrs) != 0) {
+ if (FnAttribute == Attribute::None) { // add a slot so they get added.
+ Record.push_back(~0U);
+ Record.push_back(0);
+ }
+
+ FnAttribute |= RetAttribute & OldRetAttrs;
+ RetAttribute &= ~OldRetAttrs;
+ }
+
+ for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
+ if (Record[i] == 0) {
+ if (RetAttribute != Attribute::None)
+ Attrs.push_back(AttributeWithIndex::get(0, RetAttribute));
+ } else if (Record[i] == ~0U) {
+ if (FnAttribute != Attribute::None)
+ Attrs.push_back(AttributeWithIndex::get(~0U, FnAttribute));
+ } else if (Record[i+1] != Attribute::None)
+ Attrs.push_back(AttributeWithIndex::get(Record[i], Record[i+1]));
+ }
+
+ MAttributes.push_back(AttrListPtr::get(Attrs.begin(), Attrs.end()));
Attrs.clear();
break;
}
unsigned NextCstNo = ValueList.size();
while (1) {
unsigned Code = Stream.ReadCode();
- if (Code == bitc::END_BLOCK) {
- if (NextCstNo != ValueList.size())
- return Error("Invalid constant reference!");
-
- if (Stream.ReadBlockEnd())
- return Error("Error at end of constants block");
- return false;
- }
+ if (Code == bitc::END_BLOCK)
+ break;
if (Code == bitc::ENTER_SUBBLOCK) {
// No known subblocks, always skip them.
V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1);
break;
}
- case bitc::CST_CODE_CE_EXTRACTVAL: {
- // CE_EXTRACTVAL: [opty, opval, n x indices]
- const Type *AggTy = getTypeByID(Record[0]);
- if (!AggTy || !AggTy->isAggregateType())
- return Error("Invalid CE_EXTRACTVAL record");
- Constant *Agg = ValueList.getConstantFwdRef(Record[1], AggTy);
- SmallVector<unsigned, 4> Indices;
- for (unsigned i = 2, e = Record.size(); i != e; ++i) {
- uint64_t Index = Record[i];
- if ((unsigned)Index != Index)
- return Error("Invalid CE_EXTRACTVAL record");
- Indices.push_back((unsigned)Index);
- }
- if (!ExtractValueInst::getIndexedType(AggTy,
- Indices.begin(), Indices.end()))
- return Error("Invalid CE_EXTRACTVAL record");
- V = ConstantExpr::getExtractValue(Agg, &Indices[0], Indices.size());
- break;
- }
- case bitc::CST_CODE_CE_INSERTVAL: {
- // CE_INSERTVAL: [opty, opval, opty, opval, n x indices]
- const Type *AggTy = getTypeByID(Record[0]);
- if (!AggTy || !AggTy->isAggregateType())
- return Error("Invalid CE_INSERTVAL record");
- Constant *Agg = ValueList.getConstantFwdRef(Record[1], AggTy);
- const Type *ValTy = getTypeByID(Record[2]);
- Constant *Val = ValueList.getConstantFwdRef(Record[3], ValTy);
- SmallVector<unsigned, 4> Indices;
- for (unsigned i = 4, e = Record.size(); i != e; ++i) {
- uint64_t Index = Record[i];
- if ((unsigned)Index != Index)
- return Error("Invalid CE_INSERTVAL record");
- Indices.push_back((unsigned)Index);
- }
- if (ExtractValueInst::getIndexedType(AggTy,
- Indices.begin(),
- Indices.end()) != ValTy)
- return Error("Invalid CE_INSERTVAL record");
- V = ConstantExpr::getInsertValue(Agg, Val, &Indices[0], Indices.size());
- break;
- }
case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#]
if (Record.size() < 3) return Error("Invalid CE_SELECT record");
V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0],
ValueList.AssignValue(V, NextCstNo);
++NextCstNo;
}
+
+ if (NextCstNo != ValueList.size())
+ return Error("Invalid constant reference!");
+
+ if (Stream.ReadBlockEnd())
+ return Error("Error at end of constants block");
+
+ // Once all the constants have been read, go through and resolve forward
+ // references.
+ ValueList.ResolveConstantForwardRefs();
+ return false;
}
/// RememberAndSkipFunctionBody - When we see the block for a function body,
SmallVector<uint64_t, 64> Record;
std::vector<std::string> SectionTable;
- std::vector<std::string> CollectorTable;
+ std::vector<std::string> GCTable;
// Read all the records for this module.
while (!Stream.AtEndOfStream()) {
return Error("Malformed BlockInfoBlock");
break;
case bitc::PARAMATTR_BLOCK_ID:
- if (ParseParamAttrBlock())
+ if (ParseAttributeBlock())
return true;
break;
case bitc::TYPE_BLOCK_ID:
SectionTable.push_back(S);
break;
}
- case bitc::MODULE_CODE_COLLECTORNAME: { // SECTIONNAME: [strchr x N]
+ case bitc::MODULE_CODE_GCNAME: { // SECTIONNAME: [strchr x N]
std::string S;
if (ConvertToString(Record, 0, S))
- return Error("Invalid MODULE_CODE_COLLECTORNAME record");
- CollectorTable.push_back(S);
+ return Error("Invalid MODULE_CODE_GCNAME record");
+ GCTable.push_back(S);
break;
}
// GLOBALVAR: [pointer type, isconst, initid,
break;
}
// FUNCTION: [type, callingconv, isproto, linkage, paramattr,
- // alignment, section, visibility, collector]
+ // alignment, section, visibility, gc]
case bitc::MODULE_CODE_FUNCTION: {
if (Record.size() < 8)
return Error("Invalid MODULE_CODE_FUNCTION record");
Func->setCallingConv(Record[1]);
bool isProto = Record[2];
Func->setLinkage(GetDecodedLinkage(Record[3]));
- Func->setParamAttrs(getParamAttrs(Record[4]));
+ Func->setAttributes(getAttributes(Record[4]));
Func->setAlignment((1 << Record[5]) >> 1);
if (Record[6]) {
}
Func->setVisibility(GetDecodedVisibility(Record[7]));
if (Record.size() > 8 && Record[8]) {
- if (Record[8]-1 > CollectorTable.size())
- return Error("Invalid collector ID");
- Func->setCollector(CollectorTable[Record[8]-1].c_str());
+ if (Record[8]-1 > GCTable.size())
+ return Error("Invalid GC ID");
+ Func->setGC(GCTable[Record[8]-1].c_str());
}
-
ValueList.push_back(Func);
// If this is a function with a body, remember the prototype we are
return Error("Premature end of bitstream");
}
+/// SkipWrapperHeader - Some systems wrap bc files with a special header for
+/// padding or other reasons. The format of this header is:
+///
+/// struct bc_header {
+/// uint32_t Magic; // 0x0B17C0DE
+/// uint32_t Version; // Version, currently always 0.
+/// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
+/// uint32_t BitcodeSize; // Size of traditional bitcode file.
+/// ... potentially other gunk ...
+/// };
+///
+/// This function is called when we find a file with a matching magic number.
+/// In this case, skip down to the subsection of the file that is actually a BC
+/// file.
+static bool SkipWrapperHeader(unsigned char *&BufPtr, unsigned char *&BufEnd) {
+ enum {
+ KnownHeaderSize = 4*4, // Size of header we read.
+ OffsetField = 2*4, // Offset in bytes to Offset field.
+ SizeField = 3*4 // Offset in bytes to Size field.
+ };
+
+
+ // Must contain the header!
+ if (BufEnd-BufPtr < KnownHeaderSize) return true;
+
+ unsigned Offset = ( BufPtr[OffsetField ] |
+ (BufPtr[OffsetField+1] << 8) |
+ (BufPtr[OffsetField+2] << 16) |
+ (BufPtr[OffsetField+3] << 24));
+ unsigned Size = ( BufPtr[SizeField ] |
+ (BufPtr[SizeField +1] << 8) |
+ (BufPtr[SizeField +2] << 16) |
+ (BufPtr[SizeField +3] << 24));
+
+ // Verify that Offset+Size fits in the file.
+ if (Offset+Size > unsigned(BufEnd-BufPtr))
+ return true;
+ BufPtr += Offset;
+ BufEnd = BufPtr+Size;
+ return false;
+}
bool BitcodeReader::ParseBitcode() {
TheModule = 0;
return Error("Bitcode stream should be a multiple of 4 bytes in length");
unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart();
- Stream.init(BufPtr, BufPtr+Buffer->getBufferSize());
+ unsigned char *BufEnd = BufPtr+Buffer->getBufferSize();
+
+ // If we have a wrapper header, parse it and ignore the non-bc file contents.
+ // The magic number is 0x0B17C0DE stored in little endian.
+ if (BufPtr != BufEnd && BufPtr[0] == 0xDE && BufPtr[1] == 0xC0 &&
+ BufPtr[2] == 0x17 && BufPtr[3] == 0x0B)
+ if (SkipWrapperHeader(BufPtr, BufEnd))
+ return Error("Invalid bitcode wrapper header");
+
+ Stream.init(BufPtr, BufEnd);
// Sniff for the signature.
if (Stream.Read(8) != 'B' ||
}
case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval]
+ // obsolete form of select
+ // handles select i1 ... in old bitcode
unsigned OpNum = 0;
Value *TrueVal, *FalseVal, *Cond;
if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
break;
}
+ case bitc::FUNC_CODE_INST_VSELECT: {// VSELECT: [ty,opval,opval,predty,pred]
+ // new form of select
+ // handles select i1 or select [N x i1]
+ unsigned OpNum = 0;
+ Value *TrueVal, *FalseVal, *Cond;
+ if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
+ getValue(Record, OpNum, TrueVal->getType(), FalseVal) ||
+ getValueTypePair(Record, OpNum, NextValueNo, Cond))
+ return Error("Invalid SELECT record");
+
+ // select condition can be either i1 or [N x i1]
+ if (const VectorType* vector_type =
+ dyn_cast<const VectorType>(Cond->getType())) {
+ // expect <n x i1>
+ if (vector_type->getElementType() != Type::Int1Ty)
+ return Error("Invalid SELECT condition type");
+ } else {
+ // expect i1
+ if (Cond->getType() != Type::Int1Ty)
+ return Error("Invalid SELECT condition type");
+ }
+
+ I = SelectInst::Create(Cond, TrueVal, FalseVal);
+ break;
+ }
+
case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval]
unsigned OpNum = 0;
Value *Vec, *Idx;
getValue(Record, OpNum, Vec1->getType(), Vec2))
return Error("Invalid SHUFFLEVEC record");
- const Type *MaskTy =
- VectorType::get(Type::Int32Ty,
- cast<VectorType>(Vec1->getType())->getNumElements());
-
- if (getValue(Record, OpNum, MaskTy, Mask))
+ if (getValueTypePair(Record, OpNum, NextValueNo, Mask))
return Error("Invalid SHUFFLEVEC record");
I = new ShuffleVectorInst(Vec1, Vec2, Mask);
break;
}
-
+
case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred]
+ // VFCmp/VICmp
+ // or old form of ICmp/FCmp returning bool
unsigned OpNum = 0;
Value *LHS, *RHS;
if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
I = new VICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
break;
}
+ case bitc::FUNC_CODE_INST_CMP2: { // CMP2: [opty, opval, opval, pred]
+ // Fcmp/ICmp returning bool or vector of bool
+ unsigned OpNum = 0;
+ Value *LHS, *RHS;
+ if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
+ getValue(Record, OpNum, LHS->getType(), RHS) ||
+ OpNum+1 != Record.size())
+ return Error("Invalid CMP2 record");
+
+ if (LHS->getType()->isFPOrFPVector())
+ I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS);
+ else
+ I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
+ break;
+ }
case bitc::FUNC_CODE_INST_GETRESULT: { // GETRESULT: [ty, val, n]
if (Record.size() != 2)
return Error("Invalid GETRESULT record");
Value *Op;
getValueTypePair(Record, OpNum, NextValueNo, Op);
unsigned Index = Record[1];
- I = new GetResultInst(Op, Index);
+ I = ExtractValueInst::Create(Op, Index);
break;
}
if (Size == 0) {
I = ReturnInst::Create();
break;
- } else {
- unsigned OpNum = 0;
- SmallVector<Value *,4> Vs;
- do {
- Value *Op = NULL;
- if (getValueTypePair(Record, OpNum, NextValueNo, Op))
- return Error("Invalid RET record");
- Vs.push_back(Op);
- } while(OpNum != Record.size());
-
- // SmallVector Vs has at least one element.
- I = ReturnInst::Create(&Vs[0], Vs.size());
+ }
+
+ unsigned OpNum = 0;
+ SmallVector<Value *,4> Vs;
+ do {
+ Value *Op = NULL;
+ if (getValueTypePair(Record, OpNum, NextValueNo, Op))
+ return Error("Invalid RET record");
+ Vs.push_back(Op);
+ } while(OpNum != Record.size());
+
+ const Type *ReturnType = F->getReturnType();
+ if (Vs.size() > 1 ||
+ (isa<StructType>(ReturnType) &&
+ (Vs.empty() || Vs[0]->getType() != ReturnType))) {
+ Value *RV = UndefValue::get(ReturnType);
+ for (unsigned i = 0, e = Vs.size(); i != e; ++i) {
+ I = InsertValueInst::Create(RV, Vs[i], i, "mrv");
+ CurBB->getInstList().push_back(I);
+ ValueList.AssignValue(I, NextValueNo++);
+ RV = I;
+ }
+ I = ReturnInst::Create(RV);
break;
}
+
+ I = ReturnInst::Create(Vs[0]);
+ break;
}
case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#]
if (Record.size() != 1 && Record.size() != 3)
case bitc::FUNC_CODE_INST_INVOKE: {
// INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...]
if (Record.size() < 4) return Error("Invalid INVOKE record");
- PAListPtr PAL = getParamAttrs(Record[0]);
+ AttrListPtr PAL = getAttributes(Record[0]);
unsigned CCInfo = Record[1];
BasicBlock *NormalBB = getBasicBlock(Record[2]);
BasicBlock *UnwindBB = getBasicBlock(Record[3]);
I = InvokeInst::Create(Callee, NormalBB, UnwindBB,
Ops.begin(), Ops.end());
cast<InvokeInst>(I)->setCallingConv(CCInfo);
- cast<InvokeInst>(I)->setParamAttrs(PAL);
+ cast<InvokeInst>(I)->setAttributes(PAL);
break;
}
case bitc::FUNC_CODE_INST_UNWIND: // UNWIND
if (Record.size() < 3)
return Error("Invalid CALL record");
- PAListPtr PAL = getParamAttrs(Record[0]);
+ AttrListPtr PAL = getAttributes(Record[0]);
unsigned CCInfo = Record[1];
unsigned OpNum = 2;
I = CallInst::Create(Callee, Args.begin(), Args.end());
cast<CallInst>(I)->setCallingConv(CCInfo>>1);
cast<CallInst>(I)->setTailCall(CCInfo & 1);
- cast<CallInst>(I)->setParamAttrs(PAL);
+ cast<CallInst>(I)->setAttributes(PAL);
break;
}
case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
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