1 //===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source 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/ParameterAttributes.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/Support/MathExtras.h"
24 #include "llvm/Support/MemoryBuffer.h"
27 BitcodeReader::~BitcodeReader() {
31 //===----------------------------------------------------------------------===//
32 // Helper functions to implement forward reference resolution, etc.
33 //===----------------------------------------------------------------------===//
35 /// ConvertToString - Convert a string from a record into an std::string, return
37 template<typename StrTy>
38 static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx,
40 if (Idx > Record.size())
43 for (unsigned i = Idx, e = Record.size(); i != e; ++i)
44 Result += (char)Record[i];
48 static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
50 default: // Map unknown/new linkages to external
51 case 0: return GlobalValue::ExternalLinkage;
52 case 1: return GlobalValue::WeakLinkage;
53 case 2: return GlobalValue::AppendingLinkage;
54 case 3: return GlobalValue::InternalLinkage;
55 case 4: return GlobalValue::LinkOnceLinkage;
56 case 5: return GlobalValue::DLLImportLinkage;
57 case 6: return GlobalValue::DLLExportLinkage;
58 case 7: return GlobalValue::ExternalWeakLinkage;
62 static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) {
64 default: // Map unknown visibilities to default.
65 case 0: return GlobalValue::DefaultVisibility;
66 case 1: return GlobalValue::HiddenVisibility;
67 case 2: return GlobalValue::ProtectedVisibility;
71 static int GetDecodedCastOpcode(unsigned Val) {
74 case bitc::CAST_TRUNC : return Instruction::Trunc;
75 case bitc::CAST_ZEXT : return Instruction::ZExt;
76 case bitc::CAST_SEXT : return Instruction::SExt;
77 case bitc::CAST_FPTOUI : return Instruction::FPToUI;
78 case bitc::CAST_FPTOSI : return Instruction::FPToSI;
79 case bitc::CAST_UITOFP : return Instruction::UIToFP;
80 case bitc::CAST_SITOFP : return Instruction::SIToFP;
81 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc;
82 case bitc::CAST_FPEXT : return Instruction::FPExt;
83 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt;
84 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr;
85 case bitc::CAST_BITCAST : return Instruction::BitCast;
88 static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) {
91 case bitc::BINOP_ADD: return Instruction::Add;
92 case bitc::BINOP_SUB: return Instruction::Sub;
93 case bitc::BINOP_MUL: return Instruction::Mul;
94 case bitc::BINOP_UDIV: return Instruction::UDiv;
95 case bitc::BINOP_SDIV:
96 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv;
97 case bitc::BINOP_UREM: return Instruction::URem;
98 case bitc::BINOP_SREM:
99 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem;
100 case bitc::BINOP_SHL: return Instruction::Shl;
101 case bitc::BINOP_LSHR: return Instruction::LShr;
102 case bitc::BINOP_ASHR: return Instruction::AShr;
103 case bitc::BINOP_AND: return Instruction::And;
104 case bitc::BINOP_OR: return Instruction::Or;
105 case bitc::BINOP_XOR: return Instruction::Xor;
111 /// @brief A class for maintaining the slot number definition
112 /// as a placeholder for the actual definition for forward constants defs.
113 class ConstantPlaceHolder : public ConstantExpr {
114 ConstantPlaceHolder(); // DO NOT IMPLEMENT
115 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT
118 ConstantPlaceHolder(const Type *Ty)
119 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1),
120 Op(UndefValue::get(Type::Int32Ty), this) {
125 Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx,
128 // Insert a bunch of null values.
130 OperandList = &Uses[0];
134 if (Value *V = Uses[Idx]) {
135 assert(Ty == V->getType() && "Type mismatch in constant table!");
136 return cast<Constant>(V);
139 // Create and return a placeholder, which will later be RAUW'd.
140 Constant *C = new ConstantPlaceHolder(Ty);
141 Uses[Idx].init(C, this);
145 Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) {
147 // Insert a bunch of null values.
149 OperandList = &Uses[0];
153 if (Value *V = Uses[Idx]) {
154 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!");
158 // No type specified, must be invalid reference.
159 if (Ty == 0) return 0;
161 // Create and return a placeholder, which will later be RAUW'd.
162 Value *V = new Argument(Ty);
163 Uses[Idx].init(V, this);
168 const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) {
169 // If the TypeID is in range, return it.
170 if (ID < TypeList.size())
171 return TypeList[ID].get();
172 if (!isTypeTable) return 0;
174 // The type table allows forward references. Push as many Opaque types as
175 // needed to get up to ID.
176 while (TypeList.size() <= ID)
177 TypeList.push_back(OpaqueType::get());
178 return TypeList.back().get();
181 //===----------------------------------------------------------------------===//
182 // Functions for parsing blocks from the bitcode file
183 //===----------------------------------------------------------------------===//
185 bool BitcodeReader::ParseParamAttrBlock() {
186 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
187 return Error("Malformed block record");
189 if (!ParamAttrs.empty())
190 return Error("Multiple PARAMATTR blocks found!");
192 SmallVector<uint64_t, 64> Record;
194 ParamAttrsVector Attrs;
196 // Read all the records.
198 unsigned Code = Stream.ReadCode();
199 if (Code == bitc::END_BLOCK) {
200 if (Stream.ReadBlockEnd())
201 return Error("Error at end of PARAMATTR block");
205 if (Code == bitc::ENTER_SUBBLOCK) {
206 // No known subblocks, always skip them.
207 Stream.ReadSubBlockID();
208 if (Stream.SkipBlock())
209 return Error("Malformed block record");
213 if (Code == bitc::DEFINE_ABBREV) {
214 Stream.ReadAbbrevRecord();
220 switch (Stream.ReadRecord(Code, Record)) {
221 default: // Default behavior: ignore.
223 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...]
224 if (Record.size() & 1)
225 return Error("Invalid ENTRY record");
227 ParamAttrsWithIndex PAWI;
228 for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
229 PAWI.index = Record[i];
230 PAWI.attrs = Record[i+1];
231 Attrs.push_back(PAWI);
233 ParamAttrs.push_back(ParamAttrsList::get(Attrs));
242 bool BitcodeReader::ParseTypeTable() {
243 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID))
244 return Error("Malformed block record");
246 if (!TypeList.empty())
247 return Error("Multiple TYPE_BLOCKs found!");
249 SmallVector<uint64_t, 64> Record;
250 unsigned NumRecords = 0;
252 // Read all the records for this type table.
254 unsigned Code = Stream.ReadCode();
255 if (Code == bitc::END_BLOCK) {
256 if (NumRecords != TypeList.size())
257 return Error("Invalid type forward reference in TYPE_BLOCK");
258 if (Stream.ReadBlockEnd())
259 return Error("Error at end of type table block");
263 if (Code == bitc::ENTER_SUBBLOCK) {
264 // No known subblocks, always skip them.
265 Stream.ReadSubBlockID();
266 if (Stream.SkipBlock())
267 return Error("Malformed block record");
271 if (Code == bitc::DEFINE_ABBREV) {
272 Stream.ReadAbbrevRecord();
278 const Type *ResultTy = 0;
279 switch (Stream.ReadRecord(Code, Record)) {
280 default: // Default behavior: unknown type.
283 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries]
284 // TYPE_CODE_NUMENTRY contains a count of the number of types in the
285 // type list. This allows us to reserve space.
286 if (Record.size() < 1)
287 return Error("Invalid TYPE_CODE_NUMENTRY record");
288 TypeList.reserve(Record[0]);
290 case bitc::TYPE_CODE_VOID: // VOID
291 ResultTy = Type::VoidTy;
293 case bitc::TYPE_CODE_FLOAT: // FLOAT
294 ResultTy = Type::FloatTy;
296 case bitc::TYPE_CODE_DOUBLE: // DOUBLE
297 ResultTy = Type::DoubleTy;
299 case bitc::TYPE_CODE_LABEL: // LABEL
300 ResultTy = Type::LabelTy;
302 case bitc::TYPE_CODE_OPAQUE: // OPAQUE
305 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width]
306 if (Record.size() < 1)
307 return Error("Invalid Integer type record");
309 ResultTy = IntegerType::get(Record[0]);
311 case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type]
312 if (Record.size() < 1)
313 return Error("Invalid POINTER type record");
314 ResultTy = PointerType::get(getTypeByID(Record[0], true));
316 case bitc::TYPE_CODE_FUNCTION: {
317 // FUNCTION: [vararg, attrid, retty, paramty x N]
318 if (Record.size() < 3)
319 return Error("Invalid FUNCTION type record");
320 std::vector<const Type*> ArgTys;
321 for (unsigned i = 3, e = Record.size(); i != e; ++i)
322 ArgTys.push_back(getTypeByID(Record[i], true));
324 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys,
325 Record[0], getParamAttrs(Record[1]));
328 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N]
329 if (Record.size() < 2)
330 return Error("Invalid STRUCT type record");
331 std::vector<const Type*> EltTys;
332 for (unsigned i = 1, e = Record.size(); i != e; ++i)
333 EltTys.push_back(getTypeByID(Record[i], true));
334 ResultTy = StructType::get(EltTys, Record[0]);
337 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty]
338 if (Record.size() < 2)
339 return Error("Invalid ARRAY type record");
340 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]);
342 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty]
343 if (Record.size() < 2)
344 return Error("Invalid VECTOR type record");
345 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]);
349 if (NumRecords == TypeList.size()) {
350 // If this is a new type slot, just append it.
351 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get());
353 } else if (ResultTy == 0) {
354 // Otherwise, this was forward referenced, so an opaque type was created,
355 // but the result type is actually just an opaque. Leave the one we
356 // created previously.
359 // Otherwise, this was forward referenced, so an opaque type was created.
360 // Resolve the opaque type to the real type now.
361 assert(NumRecords < TypeList.size() && "Typelist imbalance");
362 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get());
364 // Don't directly push the new type on the Tab. Instead we want to replace
365 // the opaque type we previously inserted with the new concrete value. The
366 // refinement from the abstract (opaque) type to the new type causes all
367 // uses of the abstract type to use the concrete type (NewTy). This will
368 // also cause the opaque type to be deleted.
369 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy);
371 // This should have replaced the old opaque type with the new type in the
372 // value table... or with a preexisting type that was already in the
373 // system. Let's just make sure it did.
374 assert(TypeList[NumRecords-1].get() != OldTy &&
375 "refineAbstractType didn't work!");
381 bool BitcodeReader::ParseTypeSymbolTable() {
382 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID))
383 return Error("Malformed block record");
385 SmallVector<uint64_t, 64> Record;
387 // Read all the records for this type table.
388 std::string TypeName;
390 unsigned Code = Stream.ReadCode();
391 if (Code == bitc::END_BLOCK) {
392 if (Stream.ReadBlockEnd())
393 return Error("Error at end of type symbol table block");
397 if (Code == bitc::ENTER_SUBBLOCK) {
398 // No known subblocks, always skip them.
399 Stream.ReadSubBlockID();
400 if (Stream.SkipBlock())
401 return Error("Malformed block record");
405 if (Code == bitc::DEFINE_ABBREV) {
406 Stream.ReadAbbrevRecord();
412 switch (Stream.ReadRecord(Code, Record)) {
413 default: // Default behavior: unknown type.
415 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N]
416 if (ConvertToString(Record, 1, TypeName))
417 return Error("Invalid TST_ENTRY record");
418 unsigned TypeID = Record[0];
419 if (TypeID >= TypeList.size())
420 return Error("Invalid Type ID in TST_ENTRY record");
422 TheModule->addTypeName(TypeName, TypeList[TypeID].get());
429 bool BitcodeReader::ParseValueSymbolTable() {
430 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
431 return Error("Malformed block record");
433 SmallVector<uint64_t, 64> Record;
435 // Read all the records for this value table.
436 SmallString<128> ValueName;
438 unsigned Code = Stream.ReadCode();
439 if (Code == bitc::END_BLOCK) {
440 if (Stream.ReadBlockEnd())
441 return Error("Error at end of value symbol table block");
444 if (Code == bitc::ENTER_SUBBLOCK) {
445 // No known subblocks, always skip them.
446 Stream.ReadSubBlockID();
447 if (Stream.SkipBlock())
448 return Error("Malformed block record");
452 if (Code == bitc::DEFINE_ABBREV) {
453 Stream.ReadAbbrevRecord();
459 switch (Stream.ReadRecord(Code, Record)) {
460 default: // Default behavior: unknown type.
462 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N]
463 if (ConvertToString(Record, 1, ValueName))
464 return Error("Invalid TST_ENTRY record");
465 unsigned ValueID = Record[0];
466 if (ValueID >= ValueList.size())
467 return Error("Invalid Value ID in VST_ENTRY record");
468 Value *V = ValueList[ValueID];
470 V->setName(&ValueName[0], ValueName.size());
474 case bitc::VST_CODE_BBENTRY: {
475 if (ConvertToString(Record, 1, ValueName))
476 return Error("Invalid VST_BBENTRY record");
477 BasicBlock *BB = getBasicBlock(Record[0]);
479 return Error("Invalid BB ID in VST_BBENTRY record");
481 BB->setName(&ValueName[0], ValueName.size());
489 /// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in
490 /// the LSB for dense VBR encoding.
491 static uint64_t DecodeSignRotatedValue(uint64_t V) {
496 // There is no such thing as -0 with integers. "-0" really means MININT.
500 /// ResolveGlobalAndAliasInits - Resolve all of the initializers for global
501 /// values and aliases that we can.
502 bool BitcodeReader::ResolveGlobalAndAliasInits() {
503 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist;
504 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist;
506 GlobalInitWorklist.swap(GlobalInits);
507 AliasInitWorklist.swap(AliasInits);
509 while (!GlobalInitWorklist.empty()) {
510 unsigned ValID = GlobalInitWorklist.back().second;
511 if (ValID >= ValueList.size()) {
512 // Not ready to resolve this yet, it requires something later in the file.
513 GlobalInits.push_back(GlobalInitWorklist.back());
515 if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
516 GlobalInitWorklist.back().first->setInitializer(C);
518 return Error("Global variable initializer is not a constant!");
520 GlobalInitWorklist.pop_back();
523 while (!AliasInitWorklist.empty()) {
524 unsigned ValID = AliasInitWorklist.back().second;
525 if (ValID >= ValueList.size()) {
526 AliasInits.push_back(AliasInitWorklist.back());
528 if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
529 AliasInitWorklist.back().first->setAliasee(C);
531 return Error("Alias initializer is not a constant!");
533 AliasInitWorklist.pop_back();
539 bool BitcodeReader::ParseConstants() {
540 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID))
541 return Error("Malformed block record");
543 SmallVector<uint64_t, 64> Record;
545 // Read all the records for this value table.
546 const Type *CurTy = Type::Int32Ty;
547 unsigned NextCstNo = ValueList.size();
549 unsigned Code = Stream.ReadCode();
550 if (Code == bitc::END_BLOCK) {
551 if (NextCstNo != ValueList.size())
552 return Error("Invalid constant reference!");
554 if (Stream.ReadBlockEnd())
555 return Error("Error at end of constants block");
559 if (Code == bitc::ENTER_SUBBLOCK) {
560 // No known subblocks, always skip them.
561 Stream.ReadSubBlockID();
562 if (Stream.SkipBlock())
563 return Error("Malformed block record");
567 if (Code == bitc::DEFINE_ABBREV) {
568 Stream.ReadAbbrevRecord();
575 switch (Stream.ReadRecord(Code, Record)) {
576 default: // Default behavior: unknown constant
577 case bitc::CST_CODE_UNDEF: // UNDEF
578 V = UndefValue::get(CurTy);
580 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid]
582 return Error("Malformed CST_SETTYPE record");
583 if (Record[0] >= TypeList.size())
584 return Error("Invalid Type ID in CST_SETTYPE record");
585 CurTy = TypeList[Record[0]];
586 continue; // Skip the ValueList manipulation.
587 case bitc::CST_CODE_NULL: // NULL
588 V = Constant::getNullValue(CurTy);
590 case bitc::CST_CODE_INTEGER: // INTEGER: [intval]
591 if (!isa<IntegerType>(CurTy) || Record.empty())
592 return Error("Invalid CST_INTEGER record");
593 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0]));
595 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval]
596 if (!isa<IntegerType>(CurTy) || Record.empty())
597 return Error("Invalid WIDE_INTEGER record");
599 unsigned NumWords = Record.size();
600 SmallVector<uint64_t, 8> Words;
601 Words.resize(NumWords);
602 for (unsigned i = 0; i != NumWords; ++i)
603 Words[i] = DecodeSignRotatedValue(Record[i]);
604 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(),
605 NumWords, &Words[0]));
608 case bitc::CST_CODE_FLOAT: // FLOAT: [fpval]
610 return Error("Invalid FLOAT record");
611 if (CurTy == Type::FloatTy)
612 V = ConstantFP::get(CurTy, BitsToFloat(Record[0]));
613 else if (CurTy == Type::DoubleTy)
614 V = ConstantFP::get(CurTy, BitsToDouble(Record[0]));
616 V = UndefValue::get(CurTy);
619 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number]
621 return Error("Invalid CST_AGGREGATE record");
623 unsigned Size = Record.size();
624 std::vector<Constant*> Elts;
626 if (const StructType *STy = dyn_cast<StructType>(CurTy)) {
627 for (unsigned i = 0; i != Size; ++i)
628 Elts.push_back(ValueList.getConstantFwdRef(Record[i],
629 STy->getElementType(i)));
630 V = ConstantStruct::get(STy, Elts);
631 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) {
632 const Type *EltTy = ATy->getElementType();
633 for (unsigned i = 0; i != Size; ++i)
634 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
635 V = ConstantArray::get(ATy, Elts);
636 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) {
637 const Type *EltTy = VTy->getElementType();
638 for (unsigned i = 0; i != Size; ++i)
639 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
640 V = ConstantVector::get(Elts);
642 V = UndefValue::get(CurTy);
646 case bitc::CST_CODE_STRING: { // STRING: [values]
648 return Error("Invalid CST_AGGREGATE record");
650 const ArrayType *ATy = cast<ArrayType>(CurTy);
651 const Type *EltTy = ATy->getElementType();
653 unsigned Size = Record.size();
654 std::vector<Constant*> Elts;
655 for (unsigned i = 0; i != Size; ++i)
656 Elts.push_back(ConstantInt::get(EltTy, Record[i]));
657 V = ConstantArray::get(ATy, Elts);
660 case bitc::CST_CODE_CSTRING: { // CSTRING: [values]
662 return Error("Invalid CST_AGGREGATE record");
664 const ArrayType *ATy = cast<ArrayType>(CurTy);
665 const Type *EltTy = ATy->getElementType();
667 unsigned Size = Record.size();
668 std::vector<Constant*> Elts;
669 for (unsigned i = 0; i != Size; ++i)
670 Elts.push_back(ConstantInt::get(EltTy, Record[i]));
671 Elts.push_back(Constant::getNullValue(EltTy));
672 V = ConstantArray::get(ATy, Elts);
675 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval]
676 if (Record.size() < 3) return Error("Invalid CE_BINOP record");
677 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy);
679 V = UndefValue::get(CurTy); // Unknown binop.
681 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy);
682 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy);
683 V = ConstantExpr::get(Opc, LHS, RHS);
687 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval]
688 if (Record.size() < 3) return Error("Invalid CE_CAST record");
689 int Opc = GetDecodedCastOpcode(Record[0]);
691 V = UndefValue::get(CurTy); // Unknown cast.
693 const Type *OpTy = getTypeByID(Record[1]);
694 if (!OpTy) return Error("Invalid CE_CAST record");
695 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy);
696 V = ConstantExpr::getCast(Opc, Op, CurTy);
700 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands]
701 if (Record.size() & 1) return Error("Invalid CE_GEP record");
702 SmallVector<Constant*, 16> Elts;
703 for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
704 const Type *ElTy = getTypeByID(Record[i]);
705 if (!ElTy) return Error("Invalid CE_GEP record");
706 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy));
708 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1);
711 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#]
712 if (Record.size() < 3) return Error("Invalid CE_SELECT record");
713 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0],
715 ValueList.getConstantFwdRef(Record[1],CurTy),
716 ValueList.getConstantFwdRef(Record[2],CurTy));
718 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval]
719 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record");
720 const VectorType *OpTy =
721 dyn_cast_or_null<VectorType>(getTypeByID(Record[0]));
722 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record");
723 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
724 Constant *Op1 = ValueList.getConstantFwdRef(Record[2],
725 OpTy->getElementType());
726 V = ConstantExpr::getExtractElement(Op0, Op1);
729 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval]
730 const VectorType *OpTy = dyn_cast<VectorType>(CurTy);
731 if (Record.size() < 3 || OpTy == 0)
732 return Error("Invalid CE_INSERTELT record");
733 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
734 Constant *Op1 = ValueList.getConstantFwdRef(Record[1],
735 OpTy->getElementType());
736 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty);
737 V = ConstantExpr::getInsertElement(Op0, Op1, Op2);
740 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval]
741 const VectorType *OpTy = dyn_cast<VectorType>(CurTy);
742 if (Record.size() < 3 || OpTy == 0)
743 return Error("Invalid CE_INSERTELT record");
744 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
745 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy);
746 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements());
747 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy);
748 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2);
751 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred]
752 if (Record.size() < 4) return Error("Invalid CE_CMP record");
753 const Type *OpTy = getTypeByID(Record[0]);
754 if (OpTy == 0) return Error("Invalid CE_CMP record");
755 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
756 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);
758 if (OpTy->isFloatingPoint())
759 V = ConstantExpr::getFCmp(Record[3], Op0, Op1);
761 V = ConstantExpr::getICmp(Record[3], Op0, Op1);
764 case bitc::CST_CODE_INLINEASM: {
765 if (Record.size() < 2) return Error("Invalid INLINEASM record");
766 std::string AsmStr, ConstrStr;
767 bool HasSideEffects = Record[0];
768 unsigned AsmStrSize = Record[1];
769 if (2+AsmStrSize >= Record.size())
770 return Error("Invalid INLINEASM record");
771 unsigned ConstStrSize = Record[2+AsmStrSize];
772 if (3+AsmStrSize+ConstStrSize > Record.size())
773 return Error("Invalid INLINEASM record");
775 for (unsigned i = 0; i != AsmStrSize; ++i)
776 AsmStr += (char)Record[2+i];
777 for (unsigned i = 0; i != ConstStrSize; ++i)
778 ConstrStr += (char)Record[3+AsmStrSize+i];
779 const PointerType *PTy = cast<PointerType>(CurTy);
780 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
781 AsmStr, ConstrStr, HasSideEffects);
786 ValueList.AssignValue(V, NextCstNo);
791 /// RememberAndSkipFunctionBody - When we see the block for a function body,
792 /// remember where it is and then skip it. This lets us lazily deserialize the
794 bool BitcodeReader::RememberAndSkipFunctionBody() {
795 // Get the function we are talking about.
796 if (FunctionsWithBodies.empty())
797 return Error("Insufficient function protos");
799 Function *Fn = FunctionsWithBodies.back();
800 FunctionsWithBodies.pop_back();
802 // Save the current stream state.
803 uint64_t CurBit = Stream.GetCurrentBitNo();
804 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage());
806 // Set the functions linkage to GhostLinkage so we know it is lazily
808 Fn->setLinkage(GlobalValue::GhostLinkage);
810 // Skip over the function block for now.
811 if (Stream.SkipBlock())
812 return Error("Malformed block record");
816 bool BitcodeReader::ParseModule(const std::string &ModuleID) {
817 // Reject multiple MODULE_BLOCK's in a single bitstream.
819 return Error("Multiple MODULE_BLOCKs in same stream");
821 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
822 return Error("Malformed block record");
824 // Otherwise, create the module.
825 TheModule = new Module(ModuleID);
827 SmallVector<uint64_t, 64> Record;
828 std::vector<std::string> SectionTable;
830 // Read all the records for this module.
831 while (!Stream.AtEndOfStream()) {
832 unsigned Code = Stream.ReadCode();
833 if (Code == bitc::END_BLOCK) {
834 if (Stream.ReadBlockEnd())
835 return Error("Error at end of module block");
837 // Patch the initializers for globals and aliases up.
838 ResolveGlobalAndAliasInits();
839 if (!GlobalInits.empty() || !AliasInits.empty())
840 return Error("Malformed global initializer set");
841 if (!FunctionsWithBodies.empty())
842 return Error("Too few function bodies found");
844 // Force deallocation of memory for these vectors to favor the client that
845 // want lazy deserialization.
846 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits);
847 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits);
848 std::vector<Function*>().swap(FunctionsWithBodies);
852 if (Code == bitc::ENTER_SUBBLOCK) {
853 switch (Stream.ReadSubBlockID()) {
854 default: // Skip unknown content.
855 if (Stream.SkipBlock())
856 return Error("Malformed block record");
858 case bitc::BLOCKINFO_BLOCK_ID:
859 if (Stream.ReadBlockInfoBlock())
860 return Error("Malformed BlockInfoBlock");
862 case bitc::PARAMATTR_BLOCK_ID:
863 if (ParseParamAttrBlock())
866 case bitc::TYPE_BLOCK_ID:
867 if (ParseTypeTable())
870 case bitc::TYPE_SYMTAB_BLOCK_ID:
871 if (ParseTypeSymbolTable())
874 case bitc::VALUE_SYMTAB_BLOCK_ID:
875 if (ParseValueSymbolTable())
878 case bitc::CONSTANTS_BLOCK_ID:
879 if (ParseConstants() || ResolveGlobalAndAliasInits())
882 case bitc::FUNCTION_BLOCK_ID:
883 // If this is the first function body we've seen, reverse the
884 // FunctionsWithBodies list.
885 if (!HasReversedFunctionsWithBodies) {
886 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end());
887 HasReversedFunctionsWithBodies = true;
890 if (RememberAndSkipFunctionBody())
897 if (Code == bitc::DEFINE_ABBREV) {
898 Stream.ReadAbbrevRecord();
903 switch (Stream.ReadRecord(Code, Record)) {
904 default: break; // Default behavior, ignore unknown content.
905 case bitc::MODULE_CODE_VERSION: // VERSION: [version#]
906 if (Record.size() < 1)
907 return Error("Malformed MODULE_CODE_VERSION");
908 // Only version #0 is supported so far.
910 return Error("Unknown bitstream version!");
912 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N]
914 if (ConvertToString(Record, 0, S))
915 return Error("Invalid MODULE_CODE_TRIPLE record");
916 TheModule->setTargetTriple(S);
919 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N]
921 if (ConvertToString(Record, 0, S))
922 return Error("Invalid MODULE_CODE_DATALAYOUT record");
923 TheModule->setDataLayout(S);
926 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N]
928 if (ConvertToString(Record, 0, S))
929 return Error("Invalid MODULE_CODE_ASM record");
930 TheModule->setModuleInlineAsm(S);
933 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N]
935 if (ConvertToString(Record, 0, S))
936 return Error("Invalid MODULE_CODE_DEPLIB record");
937 TheModule->addLibrary(S);
940 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N]
942 if (ConvertToString(Record, 0, S))
943 return Error("Invalid MODULE_CODE_SECTIONNAME record");
944 SectionTable.push_back(S);
947 // GLOBALVAR: [type, isconst, initid,
948 // linkage, alignment, section, visibility, threadlocal]
949 case bitc::MODULE_CODE_GLOBALVAR: {
950 if (Record.size() < 6)
951 return Error("Invalid MODULE_CODE_GLOBALVAR record");
952 const Type *Ty = getTypeByID(Record[0]);
953 if (!isa<PointerType>(Ty))
954 return Error("Global not a pointer type!");
955 Ty = cast<PointerType>(Ty)->getElementType();
957 bool isConstant = Record[1];
958 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]);
959 unsigned Alignment = (1 << Record[4]) >> 1;
962 if (Record[5]-1 >= SectionTable.size())
963 return Error("Invalid section ID");
964 Section = SectionTable[Record[5]-1];
966 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
967 if (Record.size() >= 6) Visibility = GetDecodedVisibility(Record[6]);
968 bool isThreadLocal = false;
969 if (Record.size() >= 7) isThreadLocal = Record[7];
971 GlobalVariable *NewGV =
972 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule);
973 NewGV->setAlignment(Alignment);
974 if (!Section.empty())
975 NewGV->setSection(Section);
976 NewGV->setVisibility(Visibility);
977 NewGV->setThreadLocal(isThreadLocal);
979 ValueList.push_back(NewGV);
981 // Remember which value to use for the global initializer.
982 if (unsigned InitID = Record[2])
983 GlobalInits.push_back(std::make_pair(NewGV, InitID-1));
986 // FUNCTION: [type, callingconv, isproto, linkage, alignment, section,
988 case bitc::MODULE_CODE_FUNCTION: {
989 if (Record.size() < 7)
990 return Error("Invalid MODULE_CODE_FUNCTION record");
991 const Type *Ty = getTypeByID(Record[0]);
992 if (!isa<PointerType>(Ty))
993 return Error("Function not a pointer type!");
994 const FunctionType *FTy =
995 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
997 return Error("Function not a pointer to function type!");
999 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage,
1002 Func->setCallingConv(Record[1]);
1003 bool isProto = Record[2];
1004 Func->setLinkage(GetDecodedLinkage(Record[3]));
1005 Func->setAlignment((1 << Record[4]) >> 1);
1007 if (Record[5]-1 >= SectionTable.size())
1008 return Error("Invalid section ID");
1009 Func->setSection(SectionTable[Record[5]-1]);
1011 Func->setVisibility(GetDecodedVisibility(Record[6]));
1013 ValueList.push_back(Func);
1015 // If this is a function with a body, remember the prototype we are
1016 // creating now, so that we can match up the body with them later.
1018 FunctionsWithBodies.push_back(Func);
1021 // ALIAS: [alias type, aliasee val#, linkage]
1022 case bitc::MODULE_CODE_ALIAS: {
1023 if (Record.size() < 3)
1024 return Error("Invalid MODULE_ALIAS record");
1025 const Type *Ty = getTypeByID(Record[0]);
1026 if (!isa<PointerType>(Ty))
1027 return Error("Function not a pointer type!");
1029 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]),
1031 ValueList.push_back(NewGA);
1032 AliasInits.push_back(std::make_pair(NewGA, Record[1]));
1035 /// MODULE_CODE_PURGEVALS: [numvals]
1036 case bitc::MODULE_CODE_PURGEVALS:
1037 // Trim down the value list to the specified size.
1038 if (Record.size() < 1 || Record[0] > ValueList.size())
1039 return Error("Invalid MODULE_PURGEVALS record");
1040 ValueList.shrinkTo(Record[0]);
1046 return Error("Premature end of bitstream");
1050 bool BitcodeReader::ParseBitcode() {
1053 if (Buffer->getBufferSize() & 3)
1054 return Error("Bitcode stream should be a multiple of 4 bytes in length");
1056 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart();
1057 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize());
1059 // Sniff for the signature.
1060 if (Stream.Read(8) != 'B' ||
1061 Stream.Read(8) != 'C' ||
1062 Stream.Read(4) != 0x0 ||
1063 Stream.Read(4) != 0xC ||
1064 Stream.Read(4) != 0xE ||
1065 Stream.Read(4) != 0xD)
1066 return Error("Invalid bitcode signature");
1068 // We expect a number of well-defined blocks, though we don't necessarily
1069 // need to understand them all.
1070 while (!Stream.AtEndOfStream()) {
1071 unsigned Code = Stream.ReadCode();
1073 if (Code != bitc::ENTER_SUBBLOCK)
1074 return Error("Invalid record at top-level");
1076 unsigned BlockID = Stream.ReadSubBlockID();
1078 // We only know the MODULE subblock ID.
1080 case bitc::BLOCKINFO_BLOCK_ID:
1081 if (Stream.ReadBlockInfoBlock())
1082 return Error("Malformed BlockInfoBlock");
1084 case bitc::MODULE_BLOCK_ID:
1085 if (ParseModule(Buffer->getBufferIdentifier()))
1089 if (Stream.SkipBlock())
1090 return Error("Malformed block record");
1099 bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) {
1100 // If it already is material, ignore the request.
1101 if (!F->hasNotBeenReadFromBytecode()) return false;
1103 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII =
1104 DeferredFunctionInfo.find(F);
1105 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!");
1107 // Move the bit stream to the saved position of the deferred function body and
1108 // restore the real linkage type for the function.
1109 Stream.JumpToBit(DFII->second.first);
1110 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second);
1111 DeferredFunctionInfo.erase(DFII);
1113 if (ParseFunctionBody(F)) {
1114 if (ErrInfo) *ErrInfo = ErrorString;
1121 Module *BitcodeReader::materializeModule(std::string *ErrInfo) {
1122 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I =
1123 DeferredFunctionInfo.begin();
1124 while (!DeferredFunctionInfo.empty()) {
1125 Function *F = (*I++).first;
1126 assert(F->hasNotBeenReadFromBytecode() &&
1127 "Deserialized function found in map!");
1128 if (materializeFunction(F, ErrInfo))
1135 /// ParseFunctionBody - Lazily parse the specified function body block.
1136 bool BitcodeReader::ParseFunctionBody(Function *F) {
1137 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID))
1138 return Error("Malformed block record");
1140 unsigned ModuleValueListSize = ValueList.size();
1142 // Add all the function arguments to the value table.
1143 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
1144 ValueList.push_back(I);
1146 unsigned NextValueNo = ValueList.size();
1147 BasicBlock *CurBB = 0;
1148 unsigned CurBBNo = 0;
1150 // Read all the records.
1151 SmallVector<uint64_t, 64> Record;
1153 unsigned Code = Stream.ReadCode();
1154 if (Code == bitc::END_BLOCK) {
1155 if (Stream.ReadBlockEnd())
1156 return Error("Error at end of function block");
1160 if (Code == bitc::ENTER_SUBBLOCK) {
1161 switch (Stream.ReadSubBlockID()) {
1162 default: // Skip unknown content.
1163 if (Stream.SkipBlock())
1164 return Error("Malformed block record");
1166 case bitc::CONSTANTS_BLOCK_ID:
1167 if (ParseConstants()) return true;
1168 NextValueNo = ValueList.size();
1170 case bitc::VALUE_SYMTAB_BLOCK_ID:
1171 if (ParseValueSymbolTable()) return true;
1177 if (Code == bitc::DEFINE_ABBREV) {
1178 Stream.ReadAbbrevRecord();
1185 switch (Stream.ReadRecord(Code, Record)) {
1186 default: // Default behavior: reject
1187 return Error("Unknown instruction");
1188 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks]
1189 if (Record.size() < 1 || Record[0] == 0)
1190 return Error("Invalid DECLAREBLOCKS record");
1191 // Create all the basic blocks for the function.
1192 FunctionBBs.resize(Record[0]);
1193 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i)
1194 FunctionBBs[i] = new BasicBlock("", F);
1195 CurBB = FunctionBBs[0];
1198 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode]
1201 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
1202 getValue(Record, OpNum, LHS->getType(), RHS) ||
1203 OpNum+1 != Record.size())
1204 return Error("Invalid BINOP record");
1206 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType());
1207 if (Opc == -1) return Error("Invalid BINOP record");
1208 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS);
1211 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc]
1214 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1215 OpNum+2 != Record.size())
1216 return Error("Invalid CAST record");
1218 const Type *ResTy = getTypeByID(Record[OpNum]);
1219 int Opc = GetDecodedCastOpcode(Record[OpNum+1]);
1220 if (Opc == -1 || ResTy == 0)
1221 return Error("Invalid CAST record");
1222 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy);
1225 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands]
1228 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr))
1229 return Error("Invalid GEP record");
1231 SmallVector<Value*, 16> GEPIdx;
1232 while (OpNum != Record.size()) {
1234 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1235 return Error("Invalid GEP record");
1236 GEPIdx.push_back(Op);
1239 I = new GetElementPtrInst(BasePtr, &GEPIdx[0], GEPIdx.size());
1243 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval]
1245 Value *TrueVal, *FalseVal, *Cond;
1246 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
1247 getValue(Record, OpNum, TrueVal->getType(), FalseVal) ||
1248 getValue(Record, OpNum, Type::Int1Ty, Cond))
1249 return Error("Invalid SELECT record");
1251 I = new SelectInst(Cond, TrueVal, FalseVal);
1255 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval]
1258 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
1259 getValue(Record, OpNum, Type::Int32Ty, Idx))
1260 return Error("Invalid EXTRACTELT record");
1261 I = new ExtractElementInst(Vec, Idx);
1265 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval]
1267 Value *Vec, *Elt, *Idx;
1268 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
1269 getValue(Record, OpNum,
1270 cast<VectorType>(Vec->getType())->getElementType(), Elt) ||
1271 getValue(Record, OpNum, Type::Int32Ty, Idx))
1272 return Error("Invalid INSERTELT record");
1273 I = new InsertElementInst(Vec, Elt, Idx);
1277 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval]
1279 Value *Vec1, *Vec2, *Mask;
1280 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) ||
1281 getValue(Record, OpNum, Vec1->getType(), Vec2))
1282 return Error("Invalid SHUFFLEVEC record");
1284 const Type *MaskTy =
1285 VectorType::get(Type::Int32Ty,
1286 cast<VectorType>(Vec1->getType())->getNumElements());
1288 if (getValue(Record, OpNum, MaskTy, Mask))
1289 return Error("Invalid SHUFFLEVEC record");
1290 I = new ShuffleVectorInst(Vec1, Vec2, Mask);
1294 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred]
1297 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
1298 getValue(Record, OpNum, LHS->getType(), RHS) ||
1299 OpNum+1 != Record.size())
1300 return Error("Invalid CMP record");
1302 if (LHS->getType()->isFPOrFPVector())
1303 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS);
1305 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
1309 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>]
1310 if (Record.size() == 0) {
1311 I = new ReturnInst();
1316 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1317 OpNum != Record.size())
1318 return Error("Invalid RET record");
1319 I = new ReturnInst(Op);
1322 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#]
1323 if (Record.size() != 1 && Record.size() != 3)
1324 return Error("Invalid BR record");
1325 BasicBlock *TrueDest = getBasicBlock(Record[0]);
1327 return Error("Invalid BR record");
1329 if (Record.size() == 1)
1330 I = new BranchInst(TrueDest);
1332 BasicBlock *FalseDest = getBasicBlock(Record[1]);
1333 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty);
1334 if (FalseDest == 0 || Cond == 0)
1335 return Error("Invalid BR record");
1336 I = new BranchInst(TrueDest, FalseDest, Cond);
1340 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops]
1341 if (Record.size() < 3 || (Record.size() & 1) == 0)
1342 return Error("Invalid SWITCH record");
1343 const Type *OpTy = getTypeByID(Record[0]);
1344 Value *Cond = getFnValueByID(Record[1], OpTy);
1345 BasicBlock *Default = getBasicBlock(Record[2]);
1346 if (OpTy == 0 || Cond == 0 || Default == 0)
1347 return Error("Invalid SWITCH record");
1348 unsigned NumCases = (Record.size()-3)/2;
1349 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases);
1350 for (unsigned i = 0, e = NumCases; i != e; ++i) {
1351 ConstantInt *CaseVal =
1352 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy));
1353 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]);
1354 if (CaseVal == 0 || DestBB == 0) {
1356 return Error("Invalid SWITCH record!");
1358 SI->addCase(CaseVal, DestBB);
1364 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [cc,fnty, op0,op1,op2, ...]
1365 if (Record.size() < 3) return Error("Invalid INVOKE record");
1366 unsigned CCInfo = Record[0];
1367 BasicBlock *NormalBB = getBasicBlock(Record[1]);
1368 BasicBlock *UnwindBB = getBasicBlock(Record[2]);
1372 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
1373 return Error("Invalid INVOKE record");
1375 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType());
1376 const FunctionType *FTy = !CalleeTy ? 0 :
1377 dyn_cast<FunctionType>(CalleeTy->getElementType());
1379 // Check that the right number of fixed parameters are here.
1380 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 ||
1381 Record.size() < OpNum+FTy->getNumParams())
1382 return Error("Invalid INVOKE record");
1384 SmallVector<Value*, 16> Ops;
1385 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
1386 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i)));
1387 if (Ops.back() == 0) return Error("Invalid INVOKE record");
1390 if (!FTy->isVarArg()) {
1391 if (Record.size() != OpNum)
1392 return Error("Invalid INVOKE record");
1394 // Read type/value pairs for varargs params.
1395 while (OpNum != Record.size()) {
1397 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1398 return Error("Invalid INVOKE record");
1403 I = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size());
1404 cast<InvokeInst>(I)->setCallingConv(CCInfo);
1407 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND
1408 I = new UnwindInst();
1410 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE
1411 I = new UnreachableInst();
1413 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...]
1414 if (Record.size() < 1 || ((Record.size()-1)&1))
1415 return Error("Invalid PHI record");
1416 const Type *Ty = getTypeByID(Record[0]);
1417 if (!Ty) return Error("Invalid PHI record");
1419 PHINode *PN = new PHINode(Ty);
1420 PN->reserveOperandSpace(Record.size()-1);
1422 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) {
1423 Value *V = getFnValueByID(Record[1+i], Ty);
1424 BasicBlock *BB = getBasicBlock(Record[2+i]);
1425 if (!V || !BB) return Error("Invalid PHI record");
1426 PN->addIncoming(V, BB);
1432 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align]
1433 if (Record.size() < 3)
1434 return Error("Invalid MALLOC record");
1435 const PointerType *Ty =
1436 dyn_cast_or_null<PointerType>(getTypeByID(Record[0]));
1437 Value *Size = getFnValueByID(Record[1], Type::Int32Ty);
1438 unsigned Align = Record[2];
1439 if (!Ty || !Size) return Error("Invalid MALLOC record");
1440 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1);
1443 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty]
1446 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1447 OpNum != Record.size())
1448 return Error("Invalid FREE record");
1449 I = new FreeInst(Op);
1452 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align]
1453 if (Record.size() < 3)
1454 return Error("Invalid ALLOCA record");
1455 const PointerType *Ty =
1456 dyn_cast_or_null<PointerType>(getTypeByID(Record[0]));
1457 Value *Size = getFnValueByID(Record[1], Type::Int32Ty);
1458 unsigned Align = Record[2];
1459 if (!Ty || !Size) return Error("Invalid ALLOCA record");
1460 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1);
1463 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol]
1466 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1467 OpNum+2 != Record.size())
1468 return Error("Invalid LOAD record");
1470 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1);
1473 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol]
1476 if (getValueTypePair(Record, OpNum, NextValueNo, Val) ||
1477 getValue(Record, OpNum, PointerType::get(Val->getType()), Ptr) ||
1478 OpNum+2 != Record.size())
1479 return Error("Invalid STORE record");
1481 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1);
1484 case bitc::FUNC_CODE_INST_CALL: { // CALL: [cc, fnty, fnid, arg0, arg1...]
1485 if (Record.size() < 1)
1486 return Error("Invalid CALL record");
1487 unsigned CCInfo = Record[0];
1491 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
1492 return Error("Invalid CALL record");
1494 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType());
1495 const FunctionType *FTy = 0;
1496 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType());
1497 if (!FTy || Record.size() < FTy->getNumParams()+OpNum)
1498 return Error("Invalid CALL record");
1500 SmallVector<Value*, 16> Args;
1501 // Read the fixed params.
1502 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
1503 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i)));
1504 if (Args.back() == 0) return Error("Invalid CALL record");
1507 // Read type/value pairs for varargs params.
1508 if (!FTy->isVarArg()) {
1509 if (OpNum != Record.size())
1510 return Error("Invalid CALL record");
1512 while (OpNum != Record.size()) {
1514 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1515 return Error("Invalid CALL record");
1520 I = new CallInst(Callee, &Args[0], Args.size());
1521 cast<CallInst>(I)->setCallingConv(CCInfo>>1);
1522 cast<CallInst>(I)->setTailCall(CCInfo & 1);
1525 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
1526 if (Record.size() < 3)
1527 return Error("Invalid VAARG record");
1528 const Type *OpTy = getTypeByID(Record[0]);
1529 Value *Op = getFnValueByID(Record[1], OpTy);
1530 const Type *ResTy = getTypeByID(Record[2]);
1531 if (!OpTy || !Op || !ResTy)
1532 return Error("Invalid VAARG record");
1533 I = new VAArgInst(Op, ResTy);
1538 // Add instruction to end of current BB. If there is no current BB, reject
1542 return Error("Invalid instruction with no BB");
1544 CurBB->getInstList().push_back(I);
1546 // If this was a terminator instruction, move to the next block.
1547 if (isa<TerminatorInst>(I)) {
1549 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0;
1552 // Non-void values get registered in the value table for future use.
1553 if (I && I->getType() != Type::VoidTy)
1554 ValueList.AssignValue(I, NextValueNo++);
1557 // Check the function list for unresolved values.
1558 if (Argument *A = dyn_cast<Argument>(ValueList.back())) {
1559 if (A->getParent() == 0) {
1560 // We found at least one unresolved value. Nuke them all to avoid leaks.
1561 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){
1562 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) {
1563 A->replaceAllUsesWith(UndefValue::get(A->getType()));
1567 return Error("Never resolved value found in function!");
1571 // Trim the value list down to the size it was before we parsed this function.
1572 ValueList.shrinkTo(ModuleValueListSize);
1573 std::vector<BasicBlock*>().swap(FunctionBBs);
1579 //===----------------------------------------------------------------------===//
1580 // External interface
1581 //===----------------------------------------------------------------------===//
1583 /// getBitcodeModuleProvider - lazy function-at-a-time loading from a file.
1585 ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer,
1586 std::string *ErrMsg) {
1587 BitcodeReader *R = new BitcodeReader(Buffer);
1588 if (R->ParseBitcode()) {
1590 *ErrMsg = R->getErrorString();
1592 // Don't let the BitcodeReader dtor delete 'Buffer'.
1593 R->releaseMemoryBuffer();
1600 /// ParseBitcodeFile - Read the specified bitcode file, returning the module.
1601 /// If an error occurs, return null and fill in *ErrMsg if non-null.
1602 Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){
1604 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg));
1607 // Read the whole module, get a pointer to it, tell ModuleProvider not to
1608 // delete it when its dtor is run.
1609 Module *M = R->releaseModule(ErrMsg);
1611 // Don't let the BitcodeReader dtor delete 'Buffer'.
1612 R->releaseMemoryBuffer();