1 //===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This header defines the BitcodeReader class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Bitcode/ReaderWriter.h"
15 #include "BitcodeReader.h"
16 #include "llvm/Constants.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/InlineAsm.h"
19 #include "llvm/Instructions.h"
20 #include "llvm/Module.h"
21 #include "llvm/AutoUpgrade.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/ADT/SmallVector.h"
24 #include "llvm/Support/MathExtras.h"
25 #include "llvm/Support/MemoryBuffer.h"
26 #include "llvm/OperandTraits.h"
29 void BitcodeReader::FreeState() {
32 std::vector<PATypeHolder>().swap(TypeList);
35 std::vector<PAListPtr>().swap(ParamAttrs);
36 std::vector<BasicBlock*>().swap(FunctionBBs);
37 std::vector<Function*>().swap(FunctionsWithBodies);
38 DeferredFunctionInfo.clear();
41 //===----------------------------------------------------------------------===//
42 // Helper functions to implement forward reference resolution, etc.
43 //===----------------------------------------------------------------------===//
45 /// ConvertToString - Convert a string from a record into an std::string, return
47 template<typename StrTy>
48 static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx,
50 if (Idx > Record.size())
53 for (unsigned i = Idx, e = Record.size(); i != e; ++i)
54 Result += (char)Record[i];
58 static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
60 default: // Map unknown/new linkages to external
61 case 0: return GlobalValue::ExternalLinkage;
62 case 1: return GlobalValue::WeakLinkage;
63 case 2: return GlobalValue::AppendingLinkage;
64 case 3: return GlobalValue::InternalLinkage;
65 case 4: return GlobalValue::LinkOnceLinkage;
66 case 5: return GlobalValue::DLLImportLinkage;
67 case 6: return GlobalValue::DLLExportLinkage;
68 case 7: return GlobalValue::ExternalWeakLinkage;
69 case 8: return GlobalValue::CommonLinkage;
73 static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) {
75 default: // Map unknown visibilities to default.
76 case 0: return GlobalValue::DefaultVisibility;
77 case 1: return GlobalValue::HiddenVisibility;
78 case 2: return GlobalValue::ProtectedVisibility;
82 static int GetDecodedCastOpcode(unsigned Val) {
85 case bitc::CAST_TRUNC : return Instruction::Trunc;
86 case bitc::CAST_ZEXT : return Instruction::ZExt;
87 case bitc::CAST_SEXT : return Instruction::SExt;
88 case bitc::CAST_FPTOUI : return Instruction::FPToUI;
89 case bitc::CAST_FPTOSI : return Instruction::FPToSI;
90 case bitc::CAST_UITOFP : return Instruction::UIToFP;
91 case bitc::CAST_SITOFP : return Instruction::SIToFP;
92 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc;
93 case bitc::CAST_FPEXT : return Instruction::FPExt;
94 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt;
95 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr;
96 case bitc::CAST_BITCAST : return Instruction::BitCast;
99 static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) {
102 case bitc::BINOP_ADD: return Instruction::Add;
103 case bitc::BINOP_SUB: return Instruction::Sub;
104 case bitc::BINOP_MUL: return Instruction::Mul;
105 case bitc::BINOP_UDIV: return Instruction::UDiv;
106 case bitc::BINOP_SDIV:
107 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv;
108 case bitc::BINOP_UREM: return Instruction::URem;
109 case bitc::BINOP_SREM:
110 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem;
111 case bitc::BINOP_SHL: return Instruction::Shl;
112 case bitc::BINOP_LSHR: return Instruction::LShr;
113 case bitc::BINOP_ASHR: return Instruction::AShr;
114 case bitc::BINOP_AND: return Instruction::And;
115 case bitc::BINOP_OR: return Instruction::Or;
116 case bitc::BINOP_XOR: return Instruction::Xor;
122 /// @brief A class for maintaining the slot number definition
123 /// as a placeholder for the actual definition for forward constants defs.
124 class ConstantPlaceHolder : public ConstantExpr {
125 ConstantPlaceHolder(); // DO NOT IMPLEMENT
126 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT
128 // allocate space for exactly one operand
129 void *operator new(size_t s) {
130 return User::operator new(s, 1);
132 explicit ConstantPlaceHolder(const Type *Ty)
133 : ConstantExpr(Ty, Instruction::UserOp1, &Op<0>(), 1) {
134 Op<0>() = UndefValue::get(Type::Int32Ty);
136 /// Provide fast operand accessors
137 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
142 // FIXME: can we inherit this from ConstantExpr?
144 struct OperandTraits<ConstantPlaceHolder> : FixedNumOperandTraits<1> {
147 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantPlaceHolder, Value)
150 void BitcodeReaderValueList::resize(unsigned Desired) {
151 if (Desired > Capacity) {
152 // Since we expect many values to come from the bitcode file we better
153 // allocate the double amount, so that the array size grows exponentially
154 // at each reallocation. Also, add a small amount of 100 extra elements
155 // each time, to reallocate less frequently when the array is still small.
157 Capacity = Desired * 2 + 100;
158 Use *New = allocHungoffUses(Capacity);
159 Use *Old = OperandList;
160 unsigned Ops = getNumOperands();
161 for (int i(Ops - 1); i >= 0; --i)
162 New[i] = Old[i].get();
164 if (Old) Use::zap(Old, Old + Ops, true);
168 Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx,
171 // Insert a bunch of null values.
176 if (Value *V = OperandList[Idx]) {
177 assert(Ty == V->getType() && "Type mismatch in constant table!");
178 return cast<Constant>(V);
181 // Create and return a placeholder, which will later be RAUW'd.
182 Constant *C = new ConstantPlaceHolder(Ty);
183 OperandList[Idx] = C;
187 Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) {
189 // Insert a bunch of null values.
194 if (Value *V = OperandList[Idx]) {
195 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!");
199 // No type specified, must be invalid reference.
200 if (Ty == 0) return 0;
202 // Create and return a placeholder, which will later be RAUW'd.
203 Value *V = new Argument(Ty);
204 OperandList[Idx] = V;
209 const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) {
210 // If the TypeID is in range, return it.
211 if (ID < TypeList.size())
212 return TypeList[ID].get();
213 if (!isTypeTable) return 0;
215 // The type table allows forward references. Push as many Opaque types as
216 // needed to get up to ID.
217 while (TypeList.size() <= ID)
218 TypeList.push_back(OpaqueType::get());
219 return TypeList.back().get();
222 //===----------------------------------------------------------------------===//
223 // Functions for parsing blocks from the bitcode file
224 //===----------------------------------------------------------------------===//
226 bool BitcodeReader::ParseParamAttrBlock() {
227 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
228 return Error("Malformed block record");
230 if (!ParamAttrs.empty())
231 return Error("Multiple PARAMATTR blocks found!");
233 SmallVector<uint64_t, 64> Record;
235 SmallVector<ParamAttrsWithIndex, 8> Attrs;
237 // Read all the records.
239 unsigned Code = Stream.ReadCode();
240 if (Code == bitc::END_BLOCK) {
241 if (Stream.ReadBlockEnd())
242 return Error("Error at end of PARAMATTR block");
246 if (Code == bitc::ENTER_SUBBLOCK) {
247 // No known subblocks, always skip them.
248 Stream.ReadSubBlockID();
249 if (Stream.SkipBlock())
250 return Error("Malformed block record");
254 if (Code == bitc::DEFINE_ABBREV) {
255 Stream.ReadAbbrevRecord();
261 switch (Stream.ReadRecord(Code, Record)) {
262 default: // Default behavior: ignore.
264 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...]
265 if (Record.size() & 1)
266 return Error("Invalid ENTRY record");
268 for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
269 if (Record[i+1] != ParamAttr::None)
270 Attrs.push_back(ParamAttrsWithIndex::get(Record[i], Record[i+1]));
273 ParamAttrs.push_back(PAListPtr::get(Attrs.begin(), Attrs.end()));
282 bool BitcodeReader::ParseTypeTable() {
283 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID))
284 return Error("Malformed block record");
286 if (!TypeList.empty())
287 return Error("Multiple TYPE_BLOCKs found!");
289 SmallVector<uint64_t, 64> Record;
290 unsigned NumRecords = 0;
292 // Read all the records for this type table.
294 unsigned Code = Stream.ReadCode();
295 if (Code == bitc::END_BLOCK) {
296 if (NumRecords != TypeList.size())
297 return Error("Invalid type forward reference in TYPE_BLOCK");
298 if (Stream.ReadBlockEnd())
299 return Error("Error at end of type table block");
303 if (Code == bitc::ENTER_SUBBLOCK) {
304 // No known subblocks, always skip them.
305 Stream.ReadSubBlockID();
306 if (Stream.SkipBlock())
307 return Error("Malformed block record");
311 if (Code == bitc::DEFINE_ABBREV) {
312 Stream.ReadAbbrevRecord();
318 const Type *ResultTy = 0;
319 switch (Stream.ReadRecord(Code, Record)) {
320 default: // Default behavior: unknown type.
323 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries]
324 // TYPE_CODE_NUMENTRY contains a count of the number of types in the
325 // type list. This allows us to reserve space.
326 if (Record.size() < 1)
327 return Error("Invalid TYPE_CODE_NUMENTRY record");
328 TypeList.reserve(Record[0]);
330 case bitc::TYPE_CODE_VOID: // VOID
331 ResultTy = Type::VoidTy;
333 case bitc::TYPE_CODE_FLOAT: // FLOAT
334 ResultTy = Type::FloatTy;
336 case bitc::TYPE_CODE_DOUBLE: // DOUBLE
337 ResultTy = Type::DoubleTy;
339 case bitc::TYPE_CODE_X86_FP80: // X86_FP80
340 ResultTy = Type::X86_FP80Ty;
342 case bitc::TYPE_CODE_FP128: // FP128
343 ResultTy = Type::FP128Ty;
345 case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128
346 ResultTy = Type::PPC_FP128Ty;
348 case bitc::TYPE_CODE_LABEL: // LABEL
349 ResultTy = Type::LabelTy;
351 case bitc::TYPE_CODE_OPAQUE: // OPAQUE
354 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width]
355 if (Record.size() < 1)
356 return Error("Invalid Integer type record");
358 ResultTy = IntegerType::get(Record[0]);
360 case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or
361 // [pointee type, address space]
362 if (Record.size() < 1)
363 return Error("Invalid POINTER type record");
364 unsigned AddressSpace = 0;
365 if (Record.size() == 2)
366 AddressSpace = Record[1];
367 ResultTy = PointerType::get(getTypeByID(Record[0], true), AddressSpace);
370 case bitc::TYPE_CODE_FUNCTION: {
371 // FIXME: attrid is dead, remove it in LLVM 3.0
372 // FUNCTION: [vararg, attrid, retty, paramty x N]
373 if (Record.size() < 3)
374 return Error("Invalid FUNCTION type record");
375 std::vector<const Type*> ArgTys;
376 for (unsigned i = 3, e = Record.size(); i != e; ++i)
377 ArgTys.push_back(getTypeByID(Record[i], true));
379 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys,
383 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N]
384 if (Record.size() < 1)
385 return Error("Invalid STRUCT type record");
386 std::vector<const Type*> EltTys;
387 for (unsigned i = 1, e = Record.size(); i != e; ++i)
388 EltTys.push_back(getTypeByID(Record[i], true));
389 ResultTy = StructType::get(EltTys, Record[0]);
392 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty]
393 if (Record.size() < 2)
394 return Error("Invalid ARRAY type record");
395 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]);
397 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty]
398 if (Record.size() < 2)
399 return Error("Invalid VECTOR type record");
400 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]);
404 if (NumRecords == TypeList.size()) {
405 // If this is a new type slot, just append it.
406 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get());
408 } else if (ResultTy == 0) {
409 // Otherwise, this was forward referenced, so an opaque type was created,
410 // but the result type is actually just an opaque. Leave the one we
411 // created previously.
414 // Otherwise, this was forward referenced, so an opaque type was created.
415 // Resolve the opaque type to the real type now.
416 assert(NumRecords < TypeList.size() && "Typelist imbalance");
417 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get());
419 // Don't directly push the new type on the Tab. Instead we want to replace
420 // the opaque type we previously inserted with the new concrete value. The
421 // refinement from the abstract (opaque) type to the new type causes all
422 // uses of the abstract type to use the concrete type (NewTy). This will
423 // also cause the opaque type to be deleted.
424 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy);
426 // This should have replaced the old opaque type with the new type in the
427 // value table... or with a preexisting type that was already in the
428 // system. Let's just make sure it did.
429 assert(TypeList[NumRecords-1].get() != OldTy &&
430 "refineAbstractType didn't work!");
436 bool BitcodeReader::ParseTypeSymbolTable() {
437 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID))
438 return Error("Malformed block record");
440 SmallVector<uint64_t, 64> Record;
442 // Read all the records for this type table.
443 std::string TypeName;
445 unsigned Code = Stream.ReadCode();
446 if (Code == bitc::END_BLOCK) {
447 if (Stream.ReadBlockEnd())
448 return Error("Error at end of type symbol table block");
452 if (Code == bitc::ENTER_SUBBLOCK) {
453 // No known subblocks, always skip them.
454 Stream.ReadSubBlockID();
455 if (Stream.SkipBlock())
456 return Error("Malformed block record");
460 if (Code == bitc::DEFINE_ABBREV) {
461 Stream.ReadAbbrevRecord();
467 switch (Stream.ReadRecord(Code, Record)) {
468 default: // Default behavior: unknown type.
470 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N]
471 if (ConvertToString(Record, 1, TypeName))
472 return Error("Invalid TST_ENTRY record");
473 unsigned TypeID = Record[0];
474 if (TypeID >= TypeList.size())
475 return Error("Invalid Type ID in TST_ENTRY record");
477 TheModule->addTypeName(TypeName, TypeList[TypeID].get());
484 bool BitcodeReader::ParseValueSymbolTable() {
485 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
486 return Error("Malformed block record");
488 SmallVector<uint64_t, 64> Record;
490 // Read all the records for this value table.
491 SmallString<128> ValueName;
493 unsigned Code = Stream.ReadCode();
494 if (Code == bitc::END_BLOCK) {
495 if (Stream.ReadBlockEnd())
496 return Error("Error at end of value symbol table block");
499 if (Code == bitc::ENTER_SUBBLOCK) {
500 // No known subblocks, always skip them.
501 Stream.ReadSubBlockID();
502 if (Stream.SkipBlock())
503 return Error("Malformed block record");
507 if (Code == bitc::DEFINE_ABBREV) {
508 Stream.ReadAbbrevRecord();
514 switch (Stream.ReadRecord(Code, Record)) {
515 default: // Default behavior: unknown type.
517 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N]
518 if (ConvertToString(Record, 1, ValueName))
519 return Error("Invalid TST_ENTRY record");
520 unsigned ValueID = Record[0];
521 if (ValueID >= ValueList.size())
522 return Error("Invalid Value ID in VST_ENTRY record");
523 Value *V = ValueList[ValueID];
525 V->setName(&ValueName[0], ValueName.size());
529 case bitc::VST_CODE_BBENTRY: {
530 if (ConvertToString(Record, 1, ValueName))
531 return Error("Invalid VST_BBENTRY record");
532 BasicBlock *BB = getBasicBlock(Record[0]);
534 return Error("Invalid BB ID in VST_BBENTRY record");
536 BB->setName(&ValueName[0], ValueName.size());
544 /// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in
545 /// the LSB for dense VBR encoding.
546 static uint64_t DecodeSignRotatedValue(uint64_t V) {
551 // There is no such thing as -0 with integers. "-0" really means MININT.
555 /// ResolveGlobalAndAliasInits - Resolve all of the initializers for global
556 /// values and aliases that we can.
557 bool BitcodeReader::ResolveGlobalAndAliasInits() {
558 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist;
559 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist;
561 GlobalInitWorklist.swap(GlobalInits);
562 AliasInitWorklist.swap(AliasInits);
564 while (!GlobalInitWorklist.empty()) {
565 unsigned ValID = GlobalInitWorklist.back().second;
566 if (ValID >= ValueList.size()) {
567 // Not ready to resolve this yet, it requires something later in the file.
568 GlobalInits.push_back(GlobalInitWorklist.back());
570 if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
571 GlobalInitWorklist.back().first->setInitializer(C);
573 return Error("Global variable initializer is not a constant!");
575 GlobalInitWorklist.pop_back();
578 while (!AliasInitWorklist.empty()) {
579 unsigned ValID = AliasInitWorklist.back().second;
580 if (ValID >= ValueList.size()) {
581 AliasInits.push_back(AliasInitWorklist.back());
583 if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
584 AliasInitWorklist.back().first->setAliasee(C);
586 return Error("Alias initializer is not a constant!");
588 AliasInitWorklist.pop_back();
594 bool BitcodeReader::ParseConstants() {
595 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID))
596 return Error("Malformed block record");
598 SmallVector<uint64_t, 64> Record;
600 // Read all the records for this value table.
601 const Type *CurTy = Type::Int32Ty;
602 unsigned NextCstNo = ValueList.size();
604 unsigned Code = Stream.ReadCode();
605 if (Code == bitc::END_BLOCK) {
606 if (NextCstNo != ValueList.size())
607 return Error("Invalid constant reference!");
609 if (Stream.ReadBlockEnd())
610 return Error("Error at end of constants block");
614 if (Code == bitc::ENTER_SUBBLOCK) {
615 // No known subblocks, always skip them.
616 Stream.ReadSubBlockID();
617 if (Stream.SkipBlock())
618 return Error("Malformed block record");
622 if (Code == bitc::DEFINE_ABBREV) {
623 Stream.ReadAbbrevRecord();
630 switch (Stream.ReadRecord(Code, Record)) {
631 default: // Default behavior: unknown constant
632 case bitc::CST_CODE_UNDEF: // UNDEF
633 V = UndefValue::get(CurTy);
635 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid]
637 return Error("Malformed CST_SETTYPE record");
638 if (Record[0] >= TypeList.size())
639 return Error("Invalid Type ID in CST_SETTYPE record");
640 CurTy = TypeList[Record[0]];
641 continue; // Skip the ValueList manipulation.
642 case bitc::CST_CODE_NULL: // NULL
643 V = Constant::getNullValue(CurTy);
645 case bitc::CST_CODE_INTEGER: // INTEGER: [intval]
646 if (!isa<IntegerType>(CurTy) || Record.empty())
647 return Error("Invalid CST_INTEGER record");
648 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0]));
650 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval]
651 if (!isa<IntegerType>(CurTy) || Record.empty())
652 return Error("Invalid WIDE_INTEGER record");
654 unsigned NumWords = Record.size();
655 SmallVector<uint64_t, 8> Words;
656 Words.resize(NumWords);
657 for (unsigned i = 0; i != NumWords; ++i)
658 Words[i] = DecodeSignRotatedValue(Record[i]);
659 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(),
660 NumWords, &Words[0]));
663 case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval]
665 return Error("Invalid FLOAT record");
666 if (CurTy == Type::FloatTy)
667 V = ConstantFP::get(APFloat(APInt(32, (uint32_t)Record[0])));
668 else if (CurTy == Type::DoubleTy)
669 V = ConstantFP::get(APFloat(APInt(64, Record[0])));
670 else if (CurTy == Type::X86_FP80Ty)
671 V = ConstantFP::get(APFloat(APInt(80, 2, &Record[0])));
672 else if (CurTy == Type::FP128Ty)
673 V = ConstantFP::get(APFloat(APInt(128, 2, &Record[0]), true));
674 else if (CurTy == Type::PPC_FP128Ty)
675 V = ConstantFP::get(APFloat(APInt(128, 2, &Record[0])));
677 V = UndefValue::get(CurTy);
681 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number]
683 return Error("Invalid CST_AGGREGATE record");
685 unsigned Size = Record.size();
686 std::vector<Constant*> Elts;
688 if (const StructType *STy = dyn_cast<StructType>(CurTy)) {
689 for (unsigned i = 0; i != Size; ++i)
690 Elts.push_back(ValueList.getConstantFwdRef(Record[i],
691 STy->getElementType(i)));
692 V = ConstantStruct::get(STy, Elts);
693 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) {
694 const Type *EltTy = ATy->getElementType();
695 for (unsigned i = 0; i != Size; ++i)
696 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
697 V = ConstantArray::get(ATy, Elts);
698 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) {
699 const Type *EltTy = VTy->getElementType();
700 for (unsigned i = 0; i != Size; ++i)
701 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
702 V = ConstantVector::get(Elts);
704 V = UndefValue::get(CurTy);
708 case bitc::CST_CODE_STRING: { // STRING: [values]
710 return Error("Invalid CST_AGGREGATE record");
712 const ArrayType *ATy = cast<ArrayType>(CurTy);
713 const Type *EltTy = ATy->getElementType();
715 unsigned Size = Record.size();
716 std::vector<Constant*> Elts;
717 for (unsigned i = 0; i != Size; ++i)
718 Elts.push_back(ConstantInt::get(EltTy, Record[i]));
719 V = ConstantArray::get(ATy, Elts);
722 case bitc::CST_CODE_CSTRING: { // CSTRING: [values]
724 return Error("Invalid CST_AGGREGATE record");
726 const ArrayType *ATy = cast<ArrayType>(CurTy);
727 const Type *EltTy = ATy->getElementType();
729 unsigned Size = Record.size();
730 std::vector<Constant*> Elts;
731 for (unsigned i = 0; i != Size; ++i)
732 Elts.push_back(ConstantInt::get(EltTy, Record[i]));
733 Elts.push_back(Constant::getNullValue(EltTy));
734 V = ConstantArray::get(ATy, Elts);
737 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval]
738 if (Record.size() < 3) return Error("Invalid CE_BINOP record");
739 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy);
741 V = UndefValue::get(CurTy); // Unknown binop.
743 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy);
744 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy);
745 V = ConstantExpr::get(Opc, LHS, RHS);
749 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval]
750 if (Record.size() < 3) return Error("Invalid CE_CAST record");
751 int Opc = GetDecodedCastOpcode(Record[0]);
753 V = UndefValue::get(CurTy); // Unknown cast.
755 const Type *OpTy = getTypeByID(Record[1]);
756 if (!OpTy) return Error("Invalid CE_CAST record");
757 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy);
758 V = ConstantExpr::getCast(Opc, Op, CurTy);
762 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands]
763 if (Record.size() & 1) return Error("Invalid CE_GEP record");
764 SmallVector<Constant*, 16> Elts;
765 for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
766 const Type *ElTy = getTypeByID(Record[i]);
767 if (!ElTy) return Error("Invalid CE_GEP record");
768 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy));
770 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1);
773 case bitc::CST_CODE_CE_EXTRACTVAL: {
774 // CE_EXTRACTVAL: [opty, opval, n x indices]
775 const Type *AggTy = getTypeByID(Record[0]);
776 if (!AggTy || !AggTy->isAggregateType())
777 return Error("Invalid CE_EXTRACTVAL record");
778 Constant *Agg = ValueList.getConstantFwdRef(Record[1], AggTy);
779 SmallVector<unsigned, 4> Indices;
780 for (unsigned i = 2, e = Record.size(); i != e; ++i) {
781 uint64_t Index = Record[i];
782 if ((unsigned)Index != Index)
783 return Error("Invalid CE_EXTRACTVAL record");
784 Indices.push_back((unsigned)Index);
786 if (!ExtractValueInst::getIndexedType(AggTy,
787 Indices.begin(), Indices.end()))
788 return Error("Invalid CE_EXTRACTVAL record");
789 V = ConstantExpr::getExtractValue(Agg, &Indices[0], Indices.size());
792 case bitc::CST_CODE_CE_INSERTVAL: {
793 // CE_INSERTVAL: [opty, opval, opty, opval, n x indices]
794 const Type *AggTy = getTypeByID(Record[0]);
795 if (!AggTy || !AggTy->isAggregateType())
796 return Error("Invalid CE_INSERTVAL record");
797 Constant *Agg = ValueList.getConstantFwdRef(Record[1], AggTy);
798 const Type *ValTy = getTypeByID(Record[2]);
799 Constant *Val = ValueList.getConstantFwdRef(Record[3], ValTy);
800 SmallVector<unsigned, 4> Indices;
801 for (unsigned i = 4, e = Record.size(); i != e; ++i) {
802 uint64_t Index = Record[i];
803 if ((unsigned)Index != Index)
804 return Error("Invalid CE_INSERTVAL record");
805 Indices.push_back((unsigned)Index);
807 if (ExtractValueInst::getIndexedType(AggTy,
809 Indices.end()) != ValTy)
810 return Error("Invalid CE_INSERTVAL record");
811 V = ConstantExpr::getInsertValue(Agg, Val, &Indices[0], Indices.size());
814 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#]
815 if (Record.size() < 3) return Error("Invalid CE_SELECT record");
816 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0],
818 ValueList.getConstantFwdRef(Record[1],CurTy),
819 ValueList.getConstantFwdRef(Record[2],CurTy));
821 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval]
822 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record");
823 const VectorType *OpTy =
824 dyn_cast_or_null<VectorType>(getTypeByID(Record[0]));
825 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record");
826 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
827 Constant *Op1 = ValueList.getConstantFwdRef(Record[2],
828 OpTy->getElementType());
829 V = ConstantExpr::getExtractElement(Op0, Op1);
832 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval]
833 const VectorType *OpTy = dyn_cast<VectorType>(CurTy);
834 if (Record.size() < 3 || OpTy == 0)
835 return Error("Invalid CE_INSERTELT record");
836 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
837 Constant *Op1 = ValueList.getConstantFwdRef(Record[1],
838 OpTy->getElementType());
839 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty);
840 V = ConstantExpr::getInsertElement(Op0, Op1, Op2);
843 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval]
844 const VectorType *OpTy = dyn_cast<VectorType>(CurTy);
845 if (Record.size() < 3 || OpTy == 0)
846 return Error("Invalid CE_INSERTELT record");
847 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
848 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy);
849 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements());
850 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy);
851 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2);
854 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred]
855 if (Record.size() < 4) return Error("Invalid CE_CMP record");
856 const Type *OpTy = getTypeByID(Record[0]);
857 if (OpTy == 0) return Error("Invalid CE_CMP record");
858 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
859 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);
861 if (OpTy->isFloatingPoint())
862 V = ConstantExpr::getFCmp(Record[3], Op0, Op1);
863 else if (!isa<VectorType>(OpTy))
864 V = ConstantExpr::getICmp(Record[3], Op0, Op1);
865 else if (OpTy->isFPOrFPVector())
866 V = ConstantExpr::getVFCmp(Record[3], Op0, Op1);
868 V = ConstantExpr::getVICmp(Record[3], Op0, Op1);
871 case bitc::CST_CODE_INLINEASM: {
872 if (Record.size() < 2) return Error("Invalid INLINEASM record");
873 std::string AsmStr, ConstrStr;
874 bool HasSideEffects = Record[0];
875 unsigned AsmStrSize = Record[1];
876 if (2+AsmStrSize >= Record.size())
877 return Error("Invalid INLINEASM record");
878 unsigned ConstStrSize = Record[2+AsmStrSize];
879 if (3+AsmStrSize+ConstStrSize > Record.size())
880 return Error("Invalid INLINEASM record");
882 for (unsigned i = 0; i != AsmStrSize; ++i)
883 AsmStr += (char)Record[2+i];
884 for (unsigned i = 0; i != ConstStrSize; ++i)
885 ConstrStr += (char)Record[3+AsmStrSize+i];
886 const PointerType *PTy = cast<PointerType>(CurTy);
887 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
888 AsmStr, ConstrStr, HasSideEffects);
893 ValueList.AssignValue(V, NextCstNo);
898 /// RememberAndSkipFunctionBody - When we see the block for a function body,
899 /// remember where it is and then skip it. This lets us lazily deserialize the
901 bool BitcodeReader::RememberAndSkipFunctionBody() {
902 // Get the function we are talking about.
903 if (FunctionsWithBodies.empty())
904 return Error("Insufficient function protos");
906 Function *Fn = FunctionsWithBodies.back();
907 FunctionsWithBodies.pop_back();
909 // Save the current stream state.
910 uint64_t CurBit = Stream.GetCurrentBitNo();
911 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage());
913 // Set the functions linkage to GhostLinkage so we know it is lazily
915 Fn->setLinkage(GlobalValue::GhostLinkage);
917 // Skip over the function block for now.
918 if (Stream.SkipBlock())
919 return Error("Malformed block record");
923 bool BitcodeReader::ParseModule(const std::string &ModuleID) {
924 // Reject multiple MODULE_BLOCK's in a single bitstream.
926 return Error("Multiple MODULE_BLOCKs in same stream");
928 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
929 return Error("Malformed block record");
931 // Otherwise, create the module.
932 TheModule = new Module(ModuleID);
934 SmallVector<uint64_t, 64> Record;
935 std::vector<std::string> SectionTable;
936 std::vector<std::string> CollectorTable;
938 // Read all the records for this module.
939 while (!Stream.AtEndOfStream()) {
940 unsigned Code = Stream.ReadCode();
941 if (Code == bitc::END_BLOCK) {
942 if (Stream.ReadBlockEnd())
943 return Error("Error at end of module block");
945 // Patch the initializers for globals and aliases up.
946 ResolveGlobalAndAliasInits();
947 if (!GlobalInits.empty() || !AliasInits.empty())
948 return Error("Malformed global initializer set");
949 if (!FunctionsWithBodies.empty())
950 return Error("Too few function bodies found");
952 // Look for intrinsic functions which need to be upgraded at some point
953 for (Module::iterator FI = TheModule->begin(), FE = TheModule->end();
956 if (UpgradeIntrinsicFunction(FI, NewFn))
957 UpgradedIntrinsics.push_back(std::make_pair(FI, NewFn));
960 // Force deallocation of memory for these vectors to favor the client that
961 // want lazy deserialization.
962 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits);
963 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits);
964 std::vector<Function*>().swap(FunctionsWithBodies);
968 if (Code == bitc::ENTER_SUBBLOCK) {
969 switch (Stream.ReadSubBlockID()) {
970 default: // Skip unknown content.
971 if (Stream.SkipBlock())
972 return Error("Malformed block record");
974 case bitc::BLOCKINFO_BLOCK_ID:
975 if (Stream.ReadBlockInfoBlock())
976 return Error("Malformed BlockInfoBlock");
978 case bitc::PARAMATTR_BLOCK_ID:
979 if (ParseParamAttrBlock())
982 case bitc::TYPE_BLOCK_ID:
983 if (ParseTypeTable())
986 case bitc::TYPE_SYMTAB_BLOCK_ID:
987 if (ParseTypeSymbolTable())
990 case bitc::VALUE_SYMTAB_BLOCK_ID:
991 if (ParseValueSymbolTable())
994 case bitc::CONSTANTS_BLOCK_ID:
995 if (ParseConstants() || ResolveGlobalAndAliasInits())
998 case bitc::FUNCTION_BLOCK_ID:
999 // If this is the first function body we've seen, reverse the
1000 // FunctionsWithBodies list.
1001 if (!HasReversedFunctionsWithBodies) {
1002 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end());
1003 HasReversedFunctionsWithBodies = true;
1006 if (RememberAndSkipFunctionBody())
1013 if (Code == bitc::DEFINE_ABBREV) {
1014 Stream.ReadAbbrevRecord();
1019 switch (Stream.ReadRecord(Code, Record)) {
1020 default: break; // Default behavior, ignore unknown content.
1021 case bitc::MODULE_CODE_VERSION: // VERSION: [version#]
1022 if (Record.size() < 1)
1023 return Error("Malformed MODULE_CODE_VERSION");
1024 // Only version #0 is supported so far.
1026 return Error("Unknown bitstream version!");
1028 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N]
1030 if (ConvertToString(Record, 0, S))
1031 return Error("Invalid MODULE_CODE_TRIPLE record");
1032 TheModule->setTargetTriple(S);
1035 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N]
1037 if (ConvertToString(Record, 0, S))
1038 return Error("Invalid MODULE_CODE_DATALAYOUT record");
1039 TheModule->setDataLayout(S);
1042 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N]
1044 if (ConvertToString(Record, 0, S))
1045 return Error("Invalid MODULE_CODE_ASM record");
1046 TheModule->setModuleInlineAsm(S);
1049 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N]
1051 if (ConvertToString(Record, 0, S))
1052 return Error("Invalid MODULE_CODE_DEPLIB record");
1053 TheModule->addLibrary(S);
1056 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N]
1058 if (ConvertToString(Record, 0, S))
1059 return Error("Invalid MODULE_CODE_SECTIONNAME record");
1060 SectionTable.push_back(S);
1063 case bitc::MODULE_CODE_COLLECTORNAME: { // SECTIONNAME: [strchr x N]
1065 if (ConvertToString(Record, 0, S))
1066 return Error("Invalid MODULE_CODE_COLLECTORNAME record");
1067 CollectorTable.push_back(S);
1070 // GLOBALVAR: [pointer type, isconst, initid,
1071 // linkage, alignment, section, visibility, threadlocal]
1072 case bitc::MODULE_CODE_GLOBALVAR: {
1073 if (Record.size() < 6)
1074 return Error("Invalid MODULE_CODE_GLOBALVAR record");
1075 const Type *Ty = getTypeByID(Record[0]);
1076 if (!isa<PointerType>(Ty))
1077 return Error("Global not a pointer type!");
1078 unsigned AddressSpace = cast<PointerType>(Ty)->getAddressSpace();
1079 Ty = cast<PointerType>(Ty)->getElementType();
1081 bool isConstant = Record[1];
1082 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]);
1083 unsigned Alignment = (1 << Record[4]) >> 1;
1084 std::string Section;
1086 if (Record[5]-1 >= SectionTable.size())
1087 return Error("Invalid section ID");
1088 Section = SectionTable[Record[5]-1];
1090 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
1091 if (Record.size() > 6)
1092 Visibility = GetDecodedVisibility(Record[6]);
1093 bool isThreadLocal = false;
1094 if (Record.size() > 7)
1095 isThreadLocal = Record[7];
1097 GlobalVariable *NewGV =
1098 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule,
1099 isThreadLocal, AddressSpace);
1100 NewGV->setAlignment(Alignment);
1101 if (!Section.empty())
1102 NewGV->setSection(Section);
1103 NewGV->setVisibility(Visibility);
1104 NewGV->setThreadLocal(isThreadLocal);
1106 ValueList.push_back(NewGV);
1108 // Remember which value to use for the global initializer.
1109 if (unsigned InitID = Record[2])
1110 GlobalInits.push_back(std::make_pair(NewGV, InitID-1));
1113 // FUNCTION: [type, callingconv, isproto, linkage, paramattr,
1114 // alignment, section, visibility, collector]
1115 case bitc::MODULE_CODE_FUNCTION: {
1116 if (Record.size() < 8)
1117 return Error("Invalid MODULE_CODE_FUNCTION record");
1118 const Type *Ty = getTypeByID(Record[0]);
1119 if (!isa<PointerType>(Ty))
1120 return Error("Function not a pointer type!");
1121 const FunctionType *FTy =
1122 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
1124 return Error("Function not a pointer to function type!");
1126 Function *Func = Function::Create(FTy, GlobalValue::ExternalLinkage,
1129 Func->setCallingConv(Record[1]);
1130 bool isProto = Record[2];
1131 Func->setLinkage(GetDecodedLinkage(Record[3]));
1132 Func->setParamAttrs(getParamAttrs(Record[4]));
1134 Func->setAlignment((1 << Record[5]) >> 1);
1136 if (Record[6]-1 >= SectionTable.size())
1137 return Error("Invalid section ID");
1138 Func->setSection(SectionTable[Record[6]-1]);
1140 Func->setVisibility(GetDecodedVisibility(Record[7]));
1141 if (Record.size() > 8 && Record[8]) {
1142 if (Record[8]-1 > CollectorTable.size())
1143 return Error("Invalid collector ID");
1144 Func->setCollector(CollectorTable[Record[8]-1].c_str());
1147 ValueList.push_back(Func);
1149 // If this is a function with a body, remember the prototype we are
1150 // creating now, so that we can match up the body with them later.
1152 FunctionsWithBodies.push_back(Func);
1155 // ALIAS: [alias type, aliasee val#, linkage]
1156 // ALIAS: [alias type, aliasee val#, linkage, visibility]
1157 case bitc::MODULE_CODE_ALIAS: {
1158 if (Record.size() < 3)
1159 return Error("Invalid MODULE_ALIAS record");
1160 const Type *Ty = getTypeByID(Record[0]);
1161 if (!isa<PointerType>(Ty))
1162 return Error("Function not a pointer type!");
1164 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]),
1166 // Old bitcode files didn't have visibility field.
1167 if (Record.size() > 3)
1168 NewGA->setVisibility(GetDecodedVisibility(Record[3]));
1169 ValueList.push_back(NewGA);
1170 AliasInits.push_back(std::make_pair(NewGA, Record[1]));
1173 /// MODULE_CODE_PURGEVALS: [numvals]
1174 case bitc::MODULE_CODE_PURGEVALS:
1175 // Trim down the value list to the specified size.
1176 if (Record.size() < 1 || Record[0] > ValueList.size())
1177 return Error("Invalid MODULE_PURGEVALS record");
1178 ValueList.shrinkTo(Record[0]);
1184 return Error("Premature end of bitstream");
1187 /// SkipWrapperHeader - Some systems wrap bc files with a special header for
1188 /// padding or other reasons. The format of this header is:
1190 /// struct bc_header {
1191 /// uint32_t Magic; // 0x0B17C0DE
1192 /// uint32_t Version; // Version, currently always 0.
1193 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1194 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1195 /// ... potentially other gunk ...
1198 /// This function is called when we find a file with a matching magic number.
1199 /// In this case, skip down to the subsection of the file that is actually a BC
1201 static bool SkipWrapperHeader(unsigned char *&BufPtr, unsigned char *&BufEnd) {
1203 KnownHeaderSize = 4*4, // Size of header we read.
1204 OffsetField = 2*4, // Offset in bytes to Offset field.
1205 SizeField = 3*4 // Offset in bytes to Size field.
1209 // Must contain the header!
1210 if (BufEnd-BufPtr < KnownHeaderSize) return true;
1212 unsigned Offset = ( BufPtr[OffsetField ] |
1213 (BufPtr[OffsetField+1] << 8) |
1214 (BufPtr[OffsetField+2] << 16) |
1215 (BufPtr[OffsetField+3] << 24));
1216 unsigned Size = ( BufPtr[SizeField ] |
1217 (BufPtr[SizeField +1] << 8) |
1218 (BufPtr[SizeField +2] << 16) |
1219 (BufPtr[SizeField +3] << 24));
1221 // Verify that Offset+Size fits in the file.
1222 if (Offset+Size > unsigned(BufEnd-BufPtr))
1225 BufEnd = BufPtr+Size;
1229 bool BitcodeReader::ParseBitcode() {
1232 if (Buffer->getBufferSize() & 3)
1233 return Error("Bitcode stream should be a multiple of 4 bytes in length");
1235 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart();
1236 unsigned char *BufEnd = BufPtr+Buffer->getBufferSize();
1238 // If we have a wrapper header, parse it and ignore the non-bc file contents.
1239 // The magic number is 0x0B17C0DE stored in little endian.
1240 if (BufPtr != BufEnd && BufPtr[0] == 0xDE && BufPtr[1] == 0xC0 &&
1241 BufPtr[2] == 0x17 && BufPtr[3] == 0x0B)
1242 if (SkipWrapperHeader(BufPtr, BufEnd))
1243 return Error("Invalid bitcode wrapper header");
1245 Stream.init(BufPtr, BufEnd);
1247 // Sniff for the signature.
1248 if (Stream.Read(8) != 'B' ||
1249 Stream.Read(8) != 'C' ||
1250 Stream.Read(4) != 0x0 ||
1251 Stream.Read(4) != 0xC ||
1252 Stream.Read(4) != 0xE ||
1253 Stream.Read(4) != 0xD)
1254 return Error("Invalid bitcode signature");
1256 // We expect a number of well-defined blocks, though we don't necessarily
1257 // need to understand them all.
1258 while (!Stream.AtEndOfStream()) {
1259 unsigned Code = Stream.ReadCode();
1261 if (Code != bitc::ENTER_SUBBLOCK)
1262 return Error("Invalid record at top-level");
1264 unsigned BlockID = Stream.ReadSubBlockID();
1266 // We only know the MODULE subblock ID.
1268 case bitc::BLOCKINFO_BLOCK_ID:
1269 if (Stream.ReadBlockInfoBlock())
1270 return Error("Malformed BlockInfoBlock");
1272 case bitc::MODULE_BLOCK_ID:
1273 if (ParseModule(Buffer->getBufferIdentifier()))
1277 if (Stream.SkipBlock())
1278 return Error("Malformed block record");
1287 /// ParseFunctionBody - Lazily parse the specified function body block.
1288 bool BitcodeReader::ParseFunctionBody(Function *F) {
1289 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID))
1290 return Error("Malformed block record");
1292 unsigned ModuleValueListSize = ValueList.size();
1294 // Add all the function arguments to the value table.
1295 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
1296 ValueList.push_back(I);
1298 unsigned NextValueNo = ValueList.size();
1299 BasicBlock *CurBB = 0;
1300 unsigned CurBBNo = 0;
1302 // Read all the records.
1303 SmallVector<uint64_t, 64> Record;
1305 unsigned Code = Stream.ReadCode();
1306 if (Code == bitc::END_BLOCK) {
1307 if (Stream.ReadBlockEnd())
1308 return Error("Error at end of function block");
1312 if (Code == bitc::ENTER_SUBBLOCK) {
1313 switch (Stream.ReadSubBlockID()) {
1314 default: // Skip unknown content.
1315 if (Stream.SkipBlock())
1316 return Error("Malformed block record");
1318 case bitc::CONSTANTS_BLOCK_ID:
1319 if (ParseConstants()) return true;
1320 NextValueNo = ValueList.size();
1322 case bitc::VALUE_SYMTAB_BLOCK_ID:
1323 if (ParseValueSymbolTable()) return true;
1329 if (Code == bitc::DEFINE_ABBREV) {
1330 Stream.ReadAbbrevRecord();
1337 switch (Stream.ReadRecord(Code, Record)) {
1338 default: // Default behavior: reject
1339 return Error("Unknown instruction");
1340 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks]
1341 if (Record.size() < 1 || Record[0] == 0)
1342 return Error("Invalid DECLAREBLOCKS record");
1343 // Create all the basic blocks for the function.
1344 FunctionBBs.resize(Record[0]);
1345 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i)
1346 FunctionBBs[i] = BasicBlock::Create("", F);
1347 CurBB = FunctionBBs[0];
1350 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode]
1353 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
1354 getValue(Record, OpNum, LHS->getType(), RHS) ||
1355 OpNum+1 != Record.size())
1356 return Error("Invalid BINOP record");
1358 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType());
1359 if (Opc == -1) return Error("Invalid BINOP record");
1360 I = BinaryOperator::Create((Instruction::BinaryOps)Opc, LHS, RHS);
1363 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc]
1366 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1367 OpNum+2 != Record.size())
1368 return Error("Invalid CAST record");
1370 const Type *ResTy = getTypeByID(Record[OpNum]);
1371 int Opc = GetDecodedCastOpcode(Record[OpNum+1]);
1372 if (Opc == -1 || ResTy == 0)
1373 return Error("Invalid CAST record");
1374 I = CastInst::Create((Instruction::CastOps)Opc, Op, ResTy);
1377 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands]
1380 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr))
1381 return Error("Invalid GEP record");
1383 SmallVector<Value*, 16> GEPIdx;
1384 while (OpNum != Record.size()) {
1386 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1387 return Error("Invalid GEP record");
1388 GEPIdx.push_back(Op);
1391 I = GetElementPtrInst::Create(BasePtr, GEPIdx.begin(), GEPIdx.end());
1395 case bitc::FUNC_CODE_INST_EXTRACTVAL: {
1396 // EXTRACTVAL: [opty, opval, n x indices]
1399 if (getValueTypePair(Record, OpNum, NextValueNo, Agg))
1400 return Error("Invalid EXTRACTVAL record");
1402 SmallVector<unsigned, 4> EXTRACTVALIdx;
1403 for (unsigned RecSize = Record.size();
1404 OpNum != RecSize; ++OpNum) {
1405 uint64_t Index = Record[OpNum];
1406 if ((unsigned)Index != Index)
1407 return Error("Invalid EXTRACTVAL index");
1408 EXTRACTVALIdx.push_back((unsigned)Index);
1411 I = ExtractValueInst::Create(Agg,
1412 EXTRACTVALIdx.begin(), EXTRACTVALIdx.end());
1416 case bitc::FUNC_CODE_INST_INSERTVAL: {
1417 // INSERTVAL: [opty, opval, opty, opval, n x indices]
1420 if (getValueTypePair(Record, OpNum, NextValueNo, Agg))
1421 return Error("Invalid INSERTVAL record");
1423 if (getValueTypePair(Record, OpNum, NextValueNo, Val))
1424 return Error("Invalid INSERTVAL record");
1426 SmallVector<unsigned, 4> INSERTVALIdx;
1427 for (unsigned RecSize = Record.size();
1428 OpNum != RecSize; ++OpNum) {
1429 uint64_t Index = Record[OpNum];
1430 if ((unsigned)Index != Index)
1431 return Error("Invalid INSERTVAL index");
1432 INSERTVALIdx.push_back((unsigned)Index);
1435 I = InsertValueInst::Create(Agg, Val,
1436 INSERTVALIdx.begin(), INSERTVALIdx.end());
1440 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval]
1442 Value *TrueVal, *FalseVal, *Cond;
1443 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
1444 getValue(Record, OpNum, TrueVal->getType(), FalseVal) ||
1445 getValue(Record, OpNum, Type::Int1Ty, Cond))
1446 return Error("Invalid SELECT record");
1448 I = SelectInst::Create(Cond, TrueVal, FalseVal);
1452 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval]
1455 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
1456 getValue(Record, OpNum, Type::Int32Ty, Idx))
1457 return Error("Invalid EXTRACTELT record");
1458 I = new ExtractElementInst(Vec, Idx);
1462 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval]
1464 Value *Vec, *Elt, *Idx;
1465 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
1466 getValue(Record, OpNum,
1467 cast<VectorType>(Vec->getType())->getElementType(), Elt) ||
1468 getValue(Record, OpNum, Type::Int32Ty, Idx))
1469 return Error("Invalid INSERTELT record");
1470 I = InsertElementInst::Create(Vec, Elt, Idx);
1474 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval]
1476 Value *Vec1, *Vec2, *Mask;
1477 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) ||
1478 getValue(Record, OpNum, Vec1->getType(), Vec2))
1479 return Error("Invalid SHUFFLEVEC record");
1481 const Type *MaskTy =
1482 VectorType::get(Type::Int32Ty,
1483 cast<VectorType>(Vec1->getType())->getNumElements());
1485 if (getValue(Record, OpNum, MaskTy, Mask))
1486 return Error("Invalid SHUFFLEVEC record");
1487 I = new ShuffleVectorInst(Vec1, Vec2, Mask);
1491 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred]
1494 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
1495 getValue(Record, OpNum, LHS->getType(), RHS) ||
1496 OpNum+1 != Record.size())
1497 return Error("Invalid CMP record");
1499 if (LHS->getType()->isFloatingPoint())
1500 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS);
1501 else if (!isa<VectorType>(LHS->getType()))
1502 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
1503 else if (LHS->getType()->isFPOrFPVector())
1504 I = new VFCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS);
1506 I = new VICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
1509 case bitc::FUNC_CODE_INST_GETRESULT: { // GETRESULT: [ty, val, n]
1510 if (Record.size() != 2)
1511 return Error("Invalid GETRESULT record");
1514 getValueTypePair(Record, OpNum, NextValueNo, Op);
1515 unsigned Index = Record[1];
1516 I = new GetResultInst(Op, Index);
1520 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>]
1522 unsigned Size = Record.size();
1524 I = ReturnInst::Create();
1528 SmallVector<Value *,4> Vs;
1531 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1532 return Error("Invalid RET record");
1534 } while(OpNum != Record.size());
1536 // SmallVector Vs has at least one element.
1537 I = ReturnInst::Create(&Vs[0], Vs.size());
1541 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#]
1542 if (Record.size() != 1 && Record.size() != 3)
1543 return Error("Invalid BR record");
1544 BasicBlock *TrueDest = getBasicBlock(Record[0]);
1546 return Error("Invalid BR record");
1548 if (Record.size() == 1)
1549 I = BranchInst::Create(TrueDest);
1551 BasicBlock *FalseDest = getBasicBlock(Record[1]);
1552 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty);
1553 if (FalseDest == 0 || Cond == 0)
1554 return Error("Invalid BR record");
1555 I = BranchInst::Create(TrueDest, FalseDest, Cond);
1559 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops]
1560 if (Record.size() < 3 || (Record.size() & 1) == 0)
1561 return Error("Invalid SWITCH record");
1562 const Type *OpTy = getTypeByID(Record[0]);
1563 Value *Cond = getFnValueByID(Record[1], OpTy);
1564 BasicBlock *Default = getBasicBlock(Record[2]);
1565 if (OpTy == 0 || Cond == 0 || Default == 0)
1566 return Error("Invalid SWITCH record");
1567 unsigned NumCases = (Record.size()-3)/2;
1568 SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases);
1569 for (unsigned i = 0, e = NumCases; i != e; ++i) {
1570 ConstantInt *CaseVal =
1571 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy));
1572 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]);
1573 if (CaseVal == 0 || DestBB == 0) {
1575 return Error("Invalid SWITCH record!");
1577 SI->addCase(CaseVal, DestBB);
1583 case bitc::FUNC_CODE_INST_INVOKE: {
1584 // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...]
1585 if (Record.size() < 4) return Error("Invalid INVOKE record");
1586 PAListPtr PAL = getParamAttrs(Record[0]);
1587 unsigned CCInfo = Record[1];
1588 BasicBlock *NormalBB = getBasicBlock(Record[2]);
1589 BasicBlock *UnwindBB = getBasicBlock(Record[3]);
1593 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
1594 return Error("Invalid INVOKE record");
1596 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType());
1597 const FunctionType *FTy = !CalleeTy ? 0 :
1598 dyn_cast<FunctionType>(CalleeTy->getElementType());
1600 // Check that the right number of fixed parameters are here.
1601 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 ||
1602 Record.size() < OpNum+FTy->getNumParams())
1603 return Error("Invalid INVOKE record");
1605 SmallVector<Value*, 16> Ops;
1606 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
1607 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i)));
1608 if (Ops.back() == 0) return Error("Invalid INVOKE record");
1611 if (!FTy->isVarArg()) {
1612 if (Record.size() != OpNum)
1613 return Error("Invalid INVOKE record");
1615 // Read type/value pairs for varargs params.
1616 while (OpNum != Record.size()) {
1618 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1619 return Error("Invalid INVOKE record");
1624 I = InvokeInst::Create(Callee, NormalBB, UnwindBB,
1625 Ops.begin(), Ops.end());
1626 cast<InvokeInst>(I)->setCallingConv(CCInfo);
1627 cast<InvokeInst>(I)->setParamAttrs(PAL);
1630 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND
1631 I = new UnwindInst();
1633 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE
1634 I = new UnreachableInst();
1636 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...]
1637 if (Record.size() < 1 || ((Record.size()-1)&1))
1638 return Error("Invalid PHI record");
1639 const Type *Ty = getTypeByID(Record[0]);
1640 if (!Ty) return Error("Invalid PHI record");
1642 PHINode *PN = PHINode::Create(Ty);
1643 PN->reserveOperandSpace((Record.size()-1)/2);
1645 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) {
1646 Value *V = getFnValueByID(Record[1+i], Ty);
1647 BasicBlock *BB = getBasicBlock(Record[2+i]);
1648 if (!V || !BB) return Error("Invalid PHI record");
1649 PN->addIncoming(V, BB);
1655 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align]
1656 if (Record.size() < 3)
1657 return Error("Invalid MALLOC record");
1658 const PointerType *Ty =
1659 dyn_cast_or_null<PointerType>(getTypeByID(Record[0]));
1660 Value *Size = getFnValueByID(Record[1], Type::Int32Ty);
1661 unsigned Align = Record[2];
1662 if (!Ty || !Size) return Error("Invalid MALLOC record");
1663 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1);
1666 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty]
1669 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1670 OpNum != Record.size())
1671 return Error("Invalid FREE record");
1672 I = new FreeInst(Op);
1675 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align]
1676 if (Record.size() < 3)
1677 return Error("Invalid ALLOCA record");
1678 const PointerType *Ty =
1679 dyn_cast_or_null<PointerType>(getTypeByID(Record[0]));
1680 Value *Size = getFnValueByID(Record[1], Type::Int32Ty);
1681 unsigned Align = Record[2];
1682 if (!Ty || !Size) return Error("Invalid ALLOCA record");
1683 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1);
1686 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol]
1689 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1690 OpNum+2 != Record.size())
1691 return Error("Invalid LOAD record");
1693 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1);
1696 case bitc::FUNC_CODE_INST_STORE2: { // STORE2:[ptrty, ptr, val, align, vol]
1699 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
1700 getValue(Record, OpNum,
1701 cast<PointerType>(Ptr->getType())->getElementType(), Val) ||
1702 OpNum+2 != Record.size())
1703 return Error("Invalid STORE record");
1705 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1);
1708 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol]
1709 // FIXME: Legacy form of store instruction. Should be removed in LLVM 3.0.
1712 if (getValueTypePair(Record, OpNum, NextValueNo, Val) ||
1713 getValue(Record, OpNum, PointerType::getUnqual(Val->getType()), Ptr)||
1714 OpNum+2 != Record.size())
1715 return Error("Invalid STORE record");
1717 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1);
1720 case bitc::FUNC_CODE_INST_CALL: {
1721 // CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...]
1722 if (Record.size() < 3)
1723 return Error("Invalid CALL record");
1725 PAListPtr PAL = getParamAttrs(Record[0]);
1726 unsigned CCInfo = Record[1];
1730 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
1731 return Error("Invalid CALL record");
1733 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType());
1734 const FunctionType *FTy = 0;
1735 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType());
1736 if (!FTy || Record.size() < FTy->getNumParams()+OpNum)
1737 return Error("Invalid CALL record");
1739 SmallVector<Value*, 16> Args;
1740 // Read the fixed params.
1741 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
1742 if (FTy->getParamType(i)->getTypeID()==Type::LabelTyID)
1743 Args.push_back(getBasicBlock(Record[OpNum]));
1745 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i)));
1746 if (Args.back() == 0) return Error("Invalid CALL record");
1749 // Read type/value pairs for varargs params.
1750 if (!FTy->isVarArg()) {
1751 if (OpNum != Record.size())
1752 return Error("Invalid CALL record");
1754 while (OpNum != Record.size()) {
1756 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1757 return Error("Invalid CALL record");
1762 I = CallInst::Create(Callee, Args.begin(), Args.end());
1763 cast<CallInst>(I)->setCallingConv(CCInfo>>1);
1764 cast<CallInst>(I)->setTailCall(CCInfo & 1);
1765 cast<CallInst>(I)->setParamAttrs(PAL);
1768 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
1769 if (Record.size() < 3)
1770 return Error("Invalid VAARG record");
1771 const Type *OpTy = getTypeByID(Record[0]);
1772 Value *Op = getFnValueByID(Record[1], OpTy);
1773 const Type *ResTy = getTypeByID(Record[2]);
1774 if (!OpTy || !Op || !ResTy)
1775 return Error("Invalid VAARG record");
1776 I = new VAArgInst(Op, ResTy);
1781 // Add instruction to end of current BB. If there is no current BB, reject
1785 return Error("Invalid instruction with no BB");
1787 CurBB->getInstList().push_back(I);
1789 // If this was a terminator instruction, move to the next block.
1790 if (isa<TerminatorInst>(I)) {
1792 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0;
1795 // Non-void values get registered in the value table for future use.
1796 if (I && I->getType() != Type::VoidTy)
1797 ValueList.AssignValue(I, NextValueNo++);
1800 // Check the function list for unresolved values.
1801 if (Argument *A = dyn_cast<Argument>(ValueList.back())) {
1802 if (A->getParent() == 0) {
1803 // We found at least one unresolved value. Nuke them all to avoid leaks.
1804 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){
1805 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) {
1806 A->replaceAllUsesWith(UndefValue::get(A->getType()));
1810 return Error("Never resolved value found in function!");
1814 // Trim the value list down to the size it was before we parsed this function.
1815 ValueList.shrinkTo(ModuleValueListSize);
1816 std::vector<BasicBlock*>().swap(FunctionBBs);
1821 //===----------------------------------------------------------------------===//
1822 // ModuleProvider implementation
1823 //===----------------------------------------------------------------------===//
1826 bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) {
1827 // If it already is material, ignore the request.
1828 if (!F->hasNotBeenReadFromBitcode()) return false;
1830 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII =
1831 DeferredFunctionInfo.find(F);
1832 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!");
1834 // Move the bit stream to the saved position of the deferred function body and
1835 // restore the real linkage type for the function.
1836 Stream.JumpToBit(DFII->second.first);
1837 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second);
1839 if (ParseFunctionBody(F)) {
1840 if (ErrInfo) *ErrInfo = ErrorString;
1844 // Upgrade any old intrinsic calls in the function.
1845 for (UpgradedIntrinsicMap::iterator I = UpgradedIntrinsics.begin(),
1846 E = UpgradedIntrinsics.end(); I != E; ++I) {
1847 if (I->first != I->second) {
1848 for (Value::use_iterator UI = I->first->use_begin(),
1849 UE = I->first->use_end(); UI != UE; ) {
1850 if (CallInst* CI = dyn_cast<CallInst>(*UI++))
1851 UpgradeIntrinsicCall(CI, I->second);
1859 void BitcodeReader::dematerializeFunction(Function *F) {
1860 // If this function isn't materialized, or if it is a proto, this is a noop.
1861 if (F->hasNotBeenReadFromBitcode() || F->isDeclaration())
1864 assert(DeferredFunctionInfo.count(F) && "No info to read function later?");
1866 // Just forget the function body, we can remat it later.
1868 F->setLinkage(GlobalValue::GhostLinkage);
1872 Module *BitcodeReader::materializeModule(std::string *ErrInfo) {
1873 for (DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I =
1874 DeferredFunctionInfo.begin(), E = DeferredFunctionInfo.end(); I != E;
1876 Function *F = I->first;
1877 if (F->hasNotBeenReadFromBitcode() &&
1878 materializeFunction(F, ErrInfo))
1882 // Upgrade any intrinsic calls that slipped through (should not happen!) and
1883 // delete the old functions to clean up. We can't do this unless the entire
1884 // module is materialized because there could always be another function body
1885 // with calls to the old function.
1886 for (std::vector<std::pair<Function*, Function*> >::iterator I =
1887 UpgradedIntrinsics.begin(), E = UpgradedIntrinsics.end(); I != E; ++I) {
1888 if (I->first != I->second) {
1889 for (Value::use_iterator UI = I->first->use_begin(),
1890 UE = I->first->use_end(); UI != UE; ) {
1891 if (CallInst* CI = dyn_cast<CallInst>(*UI++))
1892 UpgradeIntrinsicCall(CI, I->second);
1894 ValueList.replaceUsesOfWith(I->first, I->second);
1895 I->first->eraseFromParent();
1898 std::vector<std::pair<Function*, Function*> >().swap(UpgradedIntrinsics);
1904 /// This method is provided by the parent ModuleProvde class and overriden
1905 /// here. It simply releases the module from its provided and frees up our
1907 /// @brief Release our hold on the generated module
1908 Module *BitcodeReader::releaseModule(std::string *ErrInfo) {
1909 // Since we're losing control of this Module, we must hand it back complete
1910 Module *M = ModuleProvider::releaseModule(ErrInfo);
1916 //===----------------------------------------------------------------------===//
1917 // External interface
1918 //===----------------------------------------------------------------------===//
1920 /// getBitcodeModuleProvider - lazy function-at-a-time loading from a file.
1922 ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer,
1923 std::string *ErrMsg) {
1924 BitcodeReader *R = new BitcodeReader(Buffer);
1925 if (R->ParseBitcode()) {
1927 *ErrMsg = R->getErrorString();
1929 // Don't let the BitcodeReader dtor delete 'Buffer'.
1930 R->releaseMemoryBuffer();
1937 /// ParseBitcodeFile - Read the specified bitcode file, returning the module.
1938 /// If an error occurs, return null and fill in *ErrMsg if non-null.
1939 Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){
1941 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg));
1944 // Read in the entire module.
1945 Module *M = R->materializeModule(ErrMsg);
1947 // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether
1948 // there was an error.
1949 R->releaseMemoryBuffer();
1951 // If there was no error, tell ModuleProvider not to delete it when its dtor
1954 M = R->releaseModule(ErrMsg);