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/AutoUpgrade.h"
23 #include "llvm/ADT/SmallString.h"
24 #include "llvm/Support/MathExtras.h"
25 #include "llvm/Support/MemoryBuffer.h"
28 void BitcodeReader::FreeState() {
31 std::vector<PATypeHolder>().swap(TypeList);
33 std::vector<const ParamAttrsList*>().swap(ParamAttrs);
34 std::vector<BasicBlock*>().swap(FunctionBBs);
35 std::vector<Function*>().swap(FunctionsWithBodies);
36 DeferredFunctionInfo.clear();
39 //===----------------------------------------------------------------------===//
40 // Helper functions to implement forward reference resolution, etc.
41 //===----------------------------------------------------------------------===//
43 /// ConvertToString - Convert a string from a record into an std::string, return
45 template<typename StrTy>
46 static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx,
48 if (Idx > Record.size())
51 for (unsigned i = Idx, e = Record.size(); i != e; ++i)
52 Result += (char)Record[i];
56 static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
58 default: // Map unknown/new linkages to external
59 case 0: return GlobalValue::ExternalLinkage;
60 case 1: return GlobalValue::WeakLinkage;
61 case 2: return GlobalValue::AppendingLinkage;
62 case 3: return GlobalValue::InternalLinkage;
63 case 4: return GlobalValue::LinkOnceLinkage;
64 case 5: return GlobalValue::DLLImportLinkage;
65 case 6: return GlobalValue::DLLExportLinkage;
66 case 7: return GlobalValue::ExternalWeakLinkage;
70 static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) {
72 default: // Map unknown visibilities to default.
73 case 0: return GlobalValue::DefaultVisibility;
74 case 1: return GlobalValue::HiddenVisibility;
75 case 2: return GlobalValue::ProtectedVisibility;
79 static int GetDecodedCastOpcode(unsigned Val) {
82 case bitc::CAST_TRUNC : return Instruction::Trunc;
83 case bitc::CAST_ZEXT : return Instruction::ZExt;
84 case bitc::CAST_SEXT : return Instruction::SExt;
85 case bitc::CAST_FPTOUI : return Instruction::FPToUI;
86 case bitc::CAST_FPTOSI : return Instruction::FPToSI;
87 case bitc::CAST_UITOFP : return Instruction::UIToFP;
88 case bitc::CAST_SITOFP : return Instruction::SIToFP;
89 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc;
90 case bitc::CAST_FPEXT : return Instruction::FPExt;
91 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt;
92 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr;
93 case bitc::CAST_BITCAST : return Instruction::BitCast;
96 static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) {
99 case bitc::BINOP_ADD: return Instruction::Add;
100 case bitc::BINOP_SUB: return Instruction::Sub;
101 case bitc::BINOP_MUL: return Instruction::Mul;
102 case bitc::BINOP_UDIV: return Instruction::UDiv;
103 case bitc::BINOP_SDIV:
104 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv;
105 case bitc::BINOP_UREM: return Instruction::URem;
106 case bitc::BINOP_SREM:
107 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem;
108 case bitc::BINOP_SHL: return Instruction::Shl;
109 case bitc::BINOP_LSHR: return Instruction::LShr;
110 case bitc::BINOP_ASHR: return Instruction::AShr;
111 case bitc::BINOP_AND: return Instruction::And;
112 case bitc::BINOP_OR: return Instruction::Or;
113 case bitc::BINOP_XOR: return Instruction::Xor;
119 /// @brief A class for maintaining the slot number definition
120 /// as a placeholder for the actual definition for forward constants defs.
121 class ConstantPlaceHolder : public ConstantExpr {
122 ConstantPlaceHolder(); // DO NOT IMPLEMENT
123 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT
126 ConstantPlaceHolder(const Type *Ty)
127 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1),
128 Op(UndefValue::get(Type::Int32Ty), this) {
133 Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx,
136 // Insert a bunch of null values.
138 OperandList = &Uses[0];
142 if (Value *V = Uses[Idx]) {
143 assert(Ty == V->getType() && "Type mismatch in constant table!");
144 return cast<Constant>(V);
147 // Create and return a placeholder, which will later be RAUW'd.
148 Constant *C = new ConstantPlaceHolder(Ty);
149 Uses[Idx].init(C, this);
153 Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) {
155 // Insert a bunch of null values.
157 OperandList = &Uses[0];
161 if (Value *V = Uses[Idx]) {
162 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!");
166 // No type specified, must be invalid reference.
167 if (Ty == 0) return 0;
169 // Create and return a placeholder, which will later be RAUW'd.
170 Value *V = new Argument(Ty);
171 Uses[Idx].init(V, this);
176 const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) {
177 // If the TypeID is in range, return it.
178 if (ID < TypeList.size())
179 return TypeList[ID].get();
180 if (!isTypeTable) return 0;
182 // The type table allows forward references. Push as many Opaque types as
183 // needed to get up to ID.
184 while (TypeList.size() <= ID)
185 TypeList.push_back(OpaqueType::get());
186 return TypeList.back().get();
189 //===----------------------------------------------------------------------===//
190 // Functions for parsing blocks from the bitcode file
191 //===----------------------------------------------------------------------===//
193 bool BitcodeReader::ParseParamAttrBlock() {
194 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
195 return Error("Malformed block record");
197 if (!ParamAttrs.empty())
198 return Error("Multiple PARAMATTR blocks found!");
200 SmallVector<uint64_t, 64> Record;
202 ParamAttrsVector Attrs;
204 // Read all the records.
206 unsigned Code = Stream.ReadCode();
207 if (Code == bitc::END_BLOCK) {
208 if (Stream.ReadBlockEnd())
209 return Error("Error at end of PARAMATTR block");
213 if (Code == bitc::ENTER_SUBBLOCK) {
214 // No known subblocks, always skip them.
215 Stream.ReadSubBlockID();
216 if (Stream.SkipBlock())
217 return Error("Malformed block record");
221 if (Code == bitc::DEFINE_ABBREV) {
222 Stream.ReadAbbrevRecord();
228 switch (Stream.ReadRecord(Code, Record)) {
229 default: // Default behavior: ignore.
231 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...]
232 if (Record.size() & 1)
233 return Error("Invalid ENTRY record");
235 ParamAttrsWithIndex PAWI;
236 for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
237 PAWI.index = Record[i];
238 PAWI.attrs = Record[i+1];
239 Attrs.push_back(PAWI);
241 ParamAttrs.push_back(ParamAttrsList::get(Attrs));
250 bool BitcodeReader::ParseTypeTable() {
251 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID))
252 return Error("Malformed block record");
254 if (!TypeList.empty())
255 return Error("Multiple TYPE_BLOCKs found!");
257 SmallVector<uint64_t, 64> Record;
258 unsigned NumRecords = 0;
260 // Read all the records for this type table.
262 unsigned Code = Stream.ReadCode();
263 if (Code == bitc::END_BLOCK) {
264 if (NumRecords != TypeList.size())
265 return Error("Invalid type forward reference in TYPE_BLOCK");
266 if (Stream.ReadBlockEnd())
267 return Error("Error at end of type table block");
271 if (Code == bitc::ENTER_SUBBLOCK) {
272 // No known subblocks, always skip them.
273 Stream.ReadSubBlockID();
274 if (Stream.SkipBlock())
275 return Error("Malformed block record");
279 if (Code == bitc::DEFINE_ABBREV) {
280 Stream.ReadAbbrevRecord();
286 const Type *ResultTy = 0;
287 switch (Stream.ReadRecord(Code, Record)) {
288 default: // Default behavior: unknown type.
291 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries]
292 // TYPE_CODE_NUMENTRY contains a count of the number of types in the
293 // type list. This allows us to reserve space.
294 if (Record.size() < 1)
295 return Error("Invalid TYPE_CODE_NUMENTRY record");
296 TypeList.reserve(Record[0]);
298 case bitc::TYPE_CODE_VOID: // VOID
299 ResultTy = Type::VoidTy;
301 case bitc::TYPE_CODE_FLOAT: // FLOAT
302 ResultTy = Type::FloatTy;
304 case bitc::TYPE_CODE_DOUBLE: // DOUBLE
305 ResultTy = Type::DoubleTy;
307 case bitc::TYPE_CODE_X86_FP80: // X86_FP80
308 ResultTy = Type::X86_FP80Ty;
310 case bitc::TYPE_CODE_FP128: // FP128
311 ResultTy = Type::FP128Ty;
313 case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128
314 ResultTy = Type::PPC_FP128Ty;
316 case bitc::TYPE_CODE_LABEL: // LABEL
317 ResultTy = Type::LabelTy;
319 case bitc::TYPE_CODE_OPAQUE: // OPAQUE
322 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width]
323 if (Record.size() < 1)
324 return Error("Invalid Integer type record");
326 ResultTy = IntegerType::get(Record[0]);
328 case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type]
329 if (Record.size() < 1)
330 return Error("Invalid POINTER type record");
331 ResultTy = PointerType::get(getTypeByID(Record[0], true));
333 case bitc::TYPE_CODE_FUNCTION: {
334 // FUNCTION: [vararg, attrid, retty, paramty x N]
335 if (Record.size() < 3)
336 return Error("Invalid FUNCTION type record");
337 std::vector<const Type*> ArgTys;
338 for (unsigned i = 3, e = Record.size(); i != e; ++i)
339 ArgTys.push_back(getTypeByID(Record[i], true));
341 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys,
342 Record[0], getParamAttrs(Record[1]));
345 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N]
346 if (Record.size() < 1)
347 return Error("Invalid STRUCT type record");
348 std::vector<const Type*> EltTys;
349 for (unsigned i = 1, e = Record.size(); i != e; ++i)
350 EltTys.push_back(getTypeByID(Record[i], true));
351 ResultTy = StructType::get(EltTys, Record[0]);
354 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty]
355 if (Record.size() < 2)
356 return Error("Invalid ARRAY type record");
357 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]);
359 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty]
360 if (Record.size() < 2)
361 return Error("Invalid VECTOR type record");
362 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]);
366 if (NumRecords == TypeList.size()) {
367 // If this is a new type slot, just append it.
368 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get());
370 } else if (ResultTy == 0) {
371 // Otherwise, this was forward referenced, so an opaque type was created,
372 // but the result type is actually just an opaque. Leave the one we
373 // created previously.
376 // Otherwise, this was forward referenced, so an opaque type was created.
377 // Resolve the opaque type to the real type now.
378 assert(NumRecords < TypeList.size() && "Typelist imbalance");
379 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get());
381 // Don't directly push the new type on the Tab. Instead we want to replace
382 // the opaque type we previously inserted with the new concrete value. The
383 // refinement from the abstract (opaque) type to the new type causes all
384 // uses of the abstract type to use the concrete type (NewTy). This will
385 // also cause the opaque type to be deleted.
386 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy);
388 // This should have replaced the old opaque type with the new type in the
389 // value table... or with a preexisting type that was already in the
390 // system. Let's just make sure it did.
391 assert(TypeList[NumRecords-1].get() != OldTy &&
392 "refineAbstractType didn't work!");
398 bool BitcodeReader::ParseTypeSymbolTable() {
399 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID))
400 return Error("Malformed block record");
402 SmallVector<uint64_t, 64> Record;
404 // Read all the records for this type table.
405 std::string TypeName;
407 unsigned Code = Stream.ReadCode();
408 if (Code == bitc::END_BLOCK) {
409 if (Stream.ReadBlockEnd())
410 return Error("Error at end of type symbol table block");
414 if (Code == bitc::ENTER_SUBBLOCK) {
415 // No known subblocks, always skip them.
416 Stream.ReadSubBlockID();
417 if (Stream.SkipBlock())
418 return Error("Malformed block record");
422 if (Code == bitc::DEFINE_ABBREV) {
423 Stream.ReadAbbrevRecord();
429 switch (Stream.ReadRecord(Code, Record)) {
430 default: // Default behavior: unknown type.
432 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N]
433 if (ConvertToString(Record, 1, TypeName))
434 return Error("Invalid TST_ENTRY record");
435 unsigned TypeID = Record[0];
436 if (TypeID >= TypeList.size())
437 return Error("Invalid Type ID in TST_ENTRY record");
439 TheModule->addTypeName(TypeName, TypeList[TypeID].get());
446 bool BitcodeReader::ParseValueSymbolTable() {
447 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
448 return Error("Malformed block record");
450 SmallVector<uint64_t, 64> Record;
452 // Read all the records for this value table.
453 SmallString<128> ValueName;
455 unsigned Code = Stream.ReadCode();
456 if (Code == bitc::END_BLOCK) {
457 if (Stream.ReadBlockEnd())
458 return Error("Error at end of value symbol table block");
461 if (Code == bitc::ENTER_SUBBLOCK) {
462 // No known subblocks, always skip them.
463 Stream.ReadSubBlockID();
464 if (Stream.SkipBlock())
465 return Error("Malformed block record");
469 if (Code == bitc::DEFINE_ABBREV) {
470 Stream.ReadAbbrevRecord();
476 switch (Stream.ReadRecord(Code, Record)) {
477 default: // Default behavior: unknown type.
479 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N]
480 if (ConvertToString(Record, 1, ValueName))
481 return Error("Invalid TST_ENTRY record");
482 unsigned ValueID = Record[0];
483 if (ValueID >= ValueList.size())
484 return Error("Invalid Value ID in VST_ENTRY record");
485 Value *V = ValueList[ValueID];
487 V->setName(&ValueName[0], ValueName.size());
491 case bitc::VST_CODE_BBENTRY: {
492 if (ConvertToString(Record, 1, ValueName))
493 return Error("Invalid VST_BBENTRY record");
494 BasicBlock *BB = getBasicBlock(Record[0]);
496 return Error("Invalid BB ID in VST_BBENTRY record");
498 BB->setName(&ValueName[0], ValueName.size());
506 /// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in
507 /// the LSB for dense VBR encoding.
508 static uint64_t DecodeSignRotatedValue(uint64_t V) {
513 // There is no such thing as -0 with integers. "-0" really means MININT.
517 /// ResolveGlobalAndAliasInits - Resolve all of the initializers for global
518 /// values and aliases that we can.
519 bool BitcodeReader::ResolveGlobalAndAliasInits() {
520 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist;
521 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist;
523 GlobalInitWorklist.swap(GlobalInits);
524 AliasInitWorklist.swap(AliasInits);
526 while (!GlobalInitWorklist.empty()) {
527 unsigned ValID = GlobalInitWorklist.back().second;
528 if (ValID >= ValueList.size()) {
529 // Not ready to resolve this yet, it requires something later in the file.
530 GlobalInits.push_back(GlobalInitWorklist.back());
532 if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
533 GlobalInitWorklist.back().first->setInitializer(C);
535 return Error("Global variable initializer is not a constant!");
537 GlobalInitWorklist.pop_back();
540 while (!AliasInitWorklist.empty()) {
541 unsigned ValID = AliasInitWorklist.back().second;
542 if (ValID >= ValueList.size()) {
543 AliasInits.push_back(AliasInitWorklist.back());
545 if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
546 AliasInitWorklist.back().first->setAliasee(C);
548 return Error("Alias initializer is not a constant!");
550 AliasInitWorklist.pop_back();
556 bool BitcodeReader::ParseConstants() {
557 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID))
558 return Error("Malformed block record");
560 SmallVector<uint64_t, 64> Record;
562 // Read all the records for this value table.
563 const Type *CurTy = Type::Int32Ty;
564 unsigned NextCstNo = ValueList.size();
566 unsigned Code = Stream.ReadCode();
567 if (Code == bitc::END_BLOCK) {
568 if (NextCstNo != ValueList.size())
569 return Error("Invalid constant reference!");
571 if (Stream.ReadBlockEnd())
572 return Error("Error at end of constants block");
576 if (Code == bitc::ENTER_SUBBLOCK) {
577 // No known subblocks, always skip them.
578 Stream.ReadSubBlockID();
579 if (Stream.SkipBlock())
580 return Error("Malformed block record");
584 if (Code == bitc::DEFINE_ABBREV) {
585 Stream.ReadAbbrevRecord();
592 switch (Stream.ReadRecord(Code, Record)) {
593 default: // Default behavior: unknown constant
594 case bitc::CST_CODE_UNDEF: // UNDEF
595 V = UndefValue::get(CurTy);
597 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid]
599 return Error("Malformed CST_SETTYPE record");
600 if (Record[0] >= TypeList.size())
601 return Error("Invalid Type ID in CST_SETTYPE record");
602 CurTy = TypeList[Record[0]];
603 continue; // Skip the ValueList manipulation.
604 case bitc::CST_CODE_NULL: // NULL
605 V = Constant::getNullValue(CurTy);
607 case bitc::CST_CODE_INTEGER: // INTEGER: [intval]
608 if (!isa<IntegerType>(CurTy) || Record.empty())
609 return Error("Invalid CST_INTEGER record");
610 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0]));
612 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval]
613 if (!isa<IntegerType>(CurTy) || Record.empty())
614 return Error("Invalid WIDE_INTEGER record");
616 unsigned NumWords = Record.size();
617 SmallVector<uint64_t, 8> Words;
618 Words.resize(NumWords);
619 for (unsigned i = 0; i != NumWords; ++i)
620 Words[i] = DecodeSignRotatedValue(Record[i]);
621 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(),
622 NumWords, &Words[0]));
625 case bitc::CST_CODE_FLOAT: // FLOAT: [fpval]
627 return Error("Invalid FLOAT record");
628 if (CurTy == Type::FloatTy)
629 V = ConstantFP::get(CurTy, BitsToFloat(Record[0]));
630 else if (CurTy == Type::DoubleTy)
631 V = ConstantFP::get(CurTy, BitsToDouble(Record[0]));
632 // FIXME: Make long double constants work.
633 else if (CurTy == Type::X86_FP80Ty ||
634 CurTy == Type::FP128Ty || CurTy == Type::PPC_FP128Ty)
635 assert(0 && "Long double constants not handled yet.");
637 V = UndefValue::get(CurTy);
640 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number]
642 return Error("Invalid CST_AGGREGATE record");
644 unsigned Size = Record.size();
645 std::vector<Constant*> Elts;
647 if (const StructType *STy = dyn_cast<StructType>(CurTy)) {
648 for (unsigned i = 0; i != Size; ++i)
649 Elts.push_back(ValueList.getConstantFwdRef(Record[i],
650 STy->getElementType(i)));
651 V = ConstantStruct::get(STy, Elts);
652 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) {
653 const Type *EltTy = ATy->getElementType();
654 for (unsigned i = 0; i != Size; ++i)
655 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
656 V = ConstantArray::get(ATy, Elts);
657 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) {
658 const Type *EltTy = VTy->getElementType();
659 for (unsigned i = 0; i != Size; ++i)
660 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
661 V = ConstantVector::get(Elts);
663 V = UndefValue::get(CurTy);
667 case bitc::CST_CODE_STRING: { // STRING: [values]
669 return Error("Invalid CST_AGGREGATE record");
671 const ArrayType *ATy = cast<ArrayType>(CurTy);
672 const Type *EltTy = ATy->getElementType();
674 unsigned Size = Record.size();
675 std::vector<Constant*> Elts;
676 for (unsigned i = 0; i != Size; ++i)
677 Elts.push_back(ConstantInt::get(EltTy, Record[i]));
678 V = ConstantArray::get(ATy, Elts);
681 case bitc::CST_CODE_CSTRING: { // CSTRING: [values]
683 return Error("Invalid CST_AGGREGATE record");
685 const ArrayType *ATy = cast<ArrayType>(CurTy);
686 const Type *EltTy = ATy->getElementType();
688 unsigned Size = Record.size();
689 std::vector<Constant*> Elts;
690 for (unsigned i = 0; i != Size; ++i)
691 Elts.push_back(ConstantInt::get(EltTy, Record[i]));
692 Elts.push_back(Constant::getNullValue(EltTy));
693 V = ConstantArray::get(ATy, Elts);
696 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval]
697 if (Record.size() < 3) return Error("Invalid CE_BINOP record");
698 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy);
700 V = UndefValue::get(CurTy); // Unknown binop.
702 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy);
703 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy);
704 V = ConstantExpr::get(Opc, LHS, RHS);
708 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval]
709 if (Record.size() < 3) return Error("Invalid CE_CAST record");
710 int Opc = GetDecodedCastOpcode(Record[0]);
712 V = UndefValue::get(CurTy); // Unknown cast.
714 const Type *OpTy = getTypeByID(Record[1]);
715 if (!OpTy) return Error("Invalid CE_CAST record");
716 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy);
717 V = ConstantExpr::getCast(Opc, Op, CurTy);
721 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands]
722 if (Record.size() & 1) return Error("Invalid CE_GEP record");
723 SmallVector<Constant*, 16> Elts;
724 for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
725 const Type *ElTy = getTypeByID(Record[i]);
726 if (!ElTy) return Error("Invalid CE_GEP record");
727 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy));
729 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1);
732 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#]
733 if (Record.size() < 3) return Error("Invalid CE_SELECT record");
734 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0],
736 ValueList.getConstantFwdRef(Record[1],CurTy),
737 ValueList.getConstantFwdRef(Record[2],CurTy));
739 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval]
740 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record");
741 const VectorType *OpTy =
742 dyn_cast_or_null<VectorType>(getTypeByID(Record[0]));
743 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record");
744 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
745 Constant *Op1 = ValueList.getConstantFwdRef(Record[2],
746 OpTy->getElementType());
747 V = ConstantExpr::getExtractElement(Op0, Op1);
750 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval]
751 const VectorType *OpTy = dyn_cast<VectorType>(CurTy);
752 if (Record.size() < 3 || OpTy == 0)
753 return Error("Invalid CE_INSERTELT record");
754 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
755 Constant *Op1 = ValueList.getConstantFwdRef(Record[1],
756 OpTy->getElementType());
757 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty);
758 V = ConstantExpr::getInsertElement(Op0, Op1, Op2);
761 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval]
762 const VectorType *OpTy = dyn_cast<VectorType>(CurTy);
763 if (Record.size() < 3 || OpTy == 0)
764 return Error("Invalid CE_INSERTELT record");
765 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
766 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy);
767 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements());
768 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy);
769 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2);
772 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred]
773 if (Record.size() < 4) return Error("Invalid CE_CMP record");
774 const Type *OpTy = getTypeByID(Record[0]);
775 if (OpTy == 0) return Error("Invalid CE_CMP record");
776 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
777 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);
779 if (OpTy->isFloatingPoint())
780 V = ConstantExpr::getFCmp(Record[3], Op0, Op1);
782 V = ConstantExpr::getICmp(Record[3], Op0, Op1);
785 case bitc::CST_CODE_INLINEASM: {
786 if (Record.size() < 2) return Error("Invalid INLINEASM record");
787 std::string AsmStr, ConstrStr;
788 bool HasSideEffects = Record[0];
789 unsigned AsmStrSize = Record[1];
790 if (2+AsmStrSize >= Record.size())
791 return Error("Invalid INLINEASM record");
792 unsigned ConstStrSize = Record[2+AsmStrSize];
793 if (3+AsmStrSize+ConstStrSize > Record.size())
794 return Error("Invalid INLINEASM record");
796 for (unsigned i = 0; i != AsmStrSize; ++i)
797 AsmStr += (char)Record[2+i];
798 for (unsigned i = 0; i != ConstStrSize; ++i)
799 ConstrStr += (char)Record[3+AsmStrSize+i];
800 const PointerType *PTy = cast<PointerType>(CurTy);
801 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
802 AsmStr, ConstrStr, HasSideEffects);
807 ValueList.AssignValue(V, NextCstNo);
812 /// RememberAndSkipFunctionBody - When we see the block for a function body,
813 /// remember where it is and then skip it. This lets us lazily deserialize the
815 bool BitcodeReader::RememberAndSkipFunctionBody() {
816 // Get the function we are talking about.
817 if (FunctionsWithBodies.empty())
818 return Error("Insufficient function protos");
820 Function *Fn = FunctionsWithBodies.back();
821 FunctionsWithBodies.pop_back();
823 // Save the current stream state.
824 uint64_t CurBit = Stream.GetCurrentBitNo();
825 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage());
827 // Set the functions linkage to GhostLinkage so we know it is lazily
829 Fn->setLinkage(GlobalValue::GhostLinkage);
831 // Skip over the function block for now.
832 if (Stream.SkipBlock())
833 return Error("Malformed block record");
837 bool BitcodeReader::ParseModule(const std::string &ModuleID) {
838 // Reject multiple MODULE_BLOCK's in a single bitstream.
840 return Error("Multiple MODULE_BLOCKs in same stream");
842 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
843 return Error("Malformed block record");
845 // Otherwise, create the module.
846 TheModule = new Module(ModuleID);
848 SmallVector<uint64_t, 64> Record;
849 std::vector<std::string> SectionTable;
851 // Read all the records for this module.
852 while (!Stream.AtEndOfStream()) {
853 unsigned Code = Stream.ReadCode();
854 if (Code == bitc::END_BLOCK) {
855 if (Stream.ReadBlockEnd())
856 return Error("Error at end of module block");
858 // Patch the initializers for globals and aliases up.
859 ResolveGlobalAndAliasInits();
860 if (!GlobalInits.empty() || !AliasInits.empty())
861 return Error("Malformed global initializer set");
862 if (!FunctionsWithBodies.empty())
863 return Error("Too few function bodies found");
865 // Look for intrinsic functions which need to be upgraded at some point
866 for (Module::iterator FI = TheModule->begin(), FE = TheModule->end();
868 if (Function* NewFn = UpgradeIntrinsicFunction(FI))
869 UpgradedIntrinsics.push_back(std::make_pair(FI, NewFn));
872 // Force deallocation of memory for these vectors to favor the client that
873 // want lazy deserialization.
874 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits);
875 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits);
876 std::vector<Function*>().swap(FunctionsWithBodies);
880 if (Code == bitc::ENTER_SUBBLOCK) {
881 switch (Stream.ReadSubBlockID()) {
882 default: // Skip unknown content.
883 if (Stream.SkipBlock())
884 return Error("Malformed block record");
886 case bitc::BLOCKINFO_BLOCK_ID:
887 if (Stream.ReadBlockInfoBlock())
888 return Error("Malformed BlockInfoBlock");
890 case bitc::PARAMATTR_BLOCK_ID:
891 if (ParseParamAttrBlock())
894 case bitc::TYPE_BLOCK_ID:
895 if (ParseTypeTable())
898 case bitc::TYPE_SYMTAB_BLOCK_ID:
899 if (ParseTypeSymbolTable())
902 case bitc::VALUE_SYMTAB_BLOCK_ID:
903 if (ParseValueSymbolTable())
906 case bitc::CONSTANTS_BLOCK_ID:
907 if (ParseConstants() || ResolveGlobalAndAliasInits())
910 case bitc::FUNCTION_BLOCK_ID:
911 // If this is the first function body we've seen, reverse the
912 // FunctionsWithBodies list.
913 if (!HasReversedFunctionsWithBodies) {
914 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end());
915 HasReversedFunctionsWithBodies = true;
918 if (RememberAndSkipFunctionBody())
925 if (Code == bitc::DEFINE_ABBREV) {
926 Stream.ReadAbbrevRecord();
931 switch (Stream.ReadRecord(Code, Record)) {
932 default: break; // Default behavior, ignore unknown content.
933 case bitc::MODULE_CODE_VERSION: // VERSION: [version#]
934 if (Record.size() < 1)
935 return Error("Malformed MODULE_CODE_VERSION");
936 // Only version #0 is supported so far.
938 return Error("Unknown bitstream version!");
940 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N]
942 if (ConvertToString(Record, 0, S))
943 return Error("Invalid MODULE_CODE_TRIPLE record");
944 TheModule->setTargetTriple(S);
947 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N]
949 if (ConvertToString(Record, 0, S))
950 return Error("Invalid MODULE_CODE_DATALAYOUT record");
951 TheModule->setDataLayout(S);
954 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N]
956 if (ConvertToString(Record, 0, S))
957 return Error("Invalid MODULE_CODE_ASM record");
958 TheModule->setModuleInlineAsm(S);
961 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N]
963 if (ConvertToString(Record, 0, S))
964 return Error("Invalid MODULE_CODE_DEPLIB record");
965 TheModule->addLibrary(S);
968 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N]
970 if (ConvertToString(Record, 0, S))
971 return Error("Invalid MODULE_CODE_SECTIONNAME record");
972 SectionTable.push_back(S);
975 // GLOBALVAR: [type, isconst, initid,
976 // linkage, alignment, section, visibility, threadlocal]
977 case bitc::MODULE_CODE_GLOBALVAR: {
978 if (Record.size() < 6)
979 return Error("Invalid MODULE_CODE_GLOBALVAR record");
980 const Type *Ty = getTypeByID(Record[0]);
981 if (!isa<PointerType>(Ty))
982 return Error("Global not a pointer type!");
983 Ty = cast<PointerType>(Ty)->getElementType();
985 bool isConstant = Record[1];
986 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]);
987 unsigned Alignment = (1 << Record[4]) >> 1;
990 if (Record[5]-1 >= SectionTable.size())
991 return Error("Invalid section ID");
992 Section = SectionTable[Record[5]-1];
994 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
995 if (Record.size() > 6)
996 Visibility = GetDecodedVisibility(Record[6]);
997 bool isThreadLocal = false;
998 if (Record.size() > 7)
999 isThreadLocal = Record[7];
1001 GlobalVariable *NewGV =
1002 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule);
1003 NewGV->setAlignment(Alignment);
1004 if (!Section.empty())
1005 NewGV->setSection(Section);
1006 NewGV->setVisibility(Visibility);
1007 NewGV->setThreadLocal(isThreadLocal);
1009 ValueList.push_back(NewGV);
1011 // Remember which value to use for the global initializer.
1012 if (unsigned InitID = Record[2])
1013 GlobalInits.push_back(std::make_pair(NewGV, InitID-1));
1016 // FUNCTION: [type, callingconv, isproto, linkage, paramattr,
1017 // alignment, section, visibility]
1018 case bitc::MODULE_CODE_FUNCTION: {
1019 if (Record.size() < 8)
1020 return Error("Invalid MODULE_CODE_FUNCTION record");
1021 const Type *Ty = getTypeByID(Record[0]);
1022 if (!isa<PointerType>(Ty))
1023 return Error("Function not a pointer type!");
1024 const FunctionType *FTy =
1025 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
1027 return Error("Function not a pointer to function type!");
1029 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage,
1032 Func->setCallingConv(Record[1]);
1033 bool isProto = Record[2];
1034 Func->setLinkage(GetDecodedLinkage(Record[3]));
1036 assert(Func->getFunctionType()->getParamAttrs() ==
1037 getParamAttrs(Record[4]));
1039 Func->setAlignment((1 << Record[5]) >> 1);
1041 if (Record[6]-1 >= SectionTable.size())
1042 return Error("Invalid section ID");
1043 Func->setSection(SectionTable[Record[6]-1]);
1045 Func->setVisibility(GetDecodedVisibility(Record[7]));
1047 ValueList.push_back(Func);
1049 // If this is a function with a body, remember the prototype we are
1050 // creating now, so that we can match up the body with them later.
1052 FunctionsWithBodies.push_back(Func);
1055 // ALIAS: [alias type, aliasee val#, linkage]
1056 case bitc::MODULE_CODE_ALIAS: {
1057 if (Record.size() < 3)
1058 return Error("Invalid MODULE_ALIAS record");
1059 const Type *Ty = getTypeByID(Record[0]);
1060 if (!isa<PointerType>(Ty))
1061 return Error("Function not a pointer type!");
1063 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]),
1065 ValueList.push_back(NewGA);
1066 AliasInits.push_back(std::make_pair(NewGA, Record[1]));
1069 /// MODULE_CODE_PURGEVALS: [numvals]
1070 case bitc::MODULE_CODE_PURGEVALS:
1071 // Trim down the value list to the specified size.
1072 if (Record.size() < 1 || Record[0] > ValueList.size())
1073 return Error("Invalid MODULE_PURGEVALS record");
1074 ValueList.shrinkTo(Record[0]);
1080 return Error("Premature end of bitstream");
1084 bool BitcodeReader::ParseBitcode() {
1087 if (Buffer->getBufferSize() & 3)
1088 return Error("Bitcode stream should be a multiple of 4 bytes in length");
1090 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart();
1091 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize());
1093 // Sniff for the signature.
1094 if (Stream.Read(8) != 'B' ||
1095 Stream.Read(8) != 'C' ||
1096 Stream.Read(4) != 0x0 ||
1097 Stream.Read(4) != 0xC ||
1098 Stream.Read(4) != 0xE ||
1099 Stream.Read(4) != 0xD)
1100 return Error("Invalid bitcode signature");
1102 // We expect a number of well-defined blocks, though we don't necessarily
1103 // need to understand them all.
1104 while (!Stream.AtEndOfStream()) {
1105 unsigned Code = Stream.ReadCode();
1107 if (Code != bitc::ENTER_SUBBLOCK)
1108 return Error("Invalid record at top-level");
1110 unsigned BlockID = Stream.ReadSubBlockID();
1112 // We only know the MODULE subblock ID.
1114 case bitc::BLOCKINFO_BLOCK_ID:
1115 if (Stream.ReadBlockInfoBlock())
1116 return Error("Malformed BlockInfoBlock");
1118 case bitc::MODULE_BLOCK_ID:
1119 if (ParseModule(Buffer->getBufferIdentifier()))
1123 if (Stream.SkipBlock())
1124 return Error("Malformed block record");
1133 /// ParseFunctionBody - Lazily parse the specified function body block.
1134 bool BitcodeReader::ParseFunctionBody(Function *F) {
1135 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID))
1136 return Error("Malformed block record");
1138 unsigned ModuleValueListSize = ValueList.size();
1140 // Add all the function arguments to the value table.
1141 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
1142 ValueList.push_back(I);
1144 unsigned NextValueNo = ValueList.size();
1145 BasicBlock *CurBB = 0;
1146 unsigned CurBBNo = 0;
1148 // Read all the records.
1149 SmallVector<uint64_t, 64> Record;
1151 unsigned Code = Stream.ReadCode();
1152 if (Code == bitc::END_BLOCK) {
1153 if (Stream.ReadBlockEnd())
1154 return Error("Error at end of function block");
1158 if (Code == bitc::ENTER_SUBBLOCK) {
1159 switch (Stream.ReadSubBlockID()) {
1160 default: // Skip unknown content.
1161 if (Stream.SkipBlock())
1162 return Error("Malformed block record");
1164 case bitc::CONSTANTS_BLOCK_ID:
1165 if (ParseConstants()) return true;
1166 NextValueNo = ValueList.size();
1168 case bitc::VALUE_SYMTAB_BLOCK_ID:
1169 if (ParseValueSymbolTable()) return true;
1175 if (Code == bitc::DEFINE_ABBREV) {
1176 Stream.ReadAbbrevRecord();
1183 switch (Stream.ReadRecord(Code, Record)) {
1184 default: // Default behavior: reject
1185 return Error("Unknown instruction");
1186 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks]
1187 if (Record.size() < 1 || Record[0] == 0)
1188 return Error("Invalid DECLAREBLOCKS record");
1189 // Create all the basic blocks for the function.
1190 FunctionBBs.resize(Record[0]);
1191 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i)
1192 FunctionBBs[i] = new BasicBlock("", F);
1193 CurBB = FunctionBBs[0];
1196 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode]
1199 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
1200 getValue(Record, OpNum, LHS->getType(), RHS) ||
1201 OpNum+1 != Record.size())
1202 return Error("Invalid BINOP record");
1204 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType());
1205 if (Opc == -1) return Error("Invalid BINOP record");
1206 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS);
1209 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc]
1212 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1213 OpNum+2 != Record.size())
1214 return Error("Invalid CAST record");
1216 const Type *ResTy = getTypeByID(Record[OpNum]);
1217 int Opc = GetDecodedCastOpcode(Record[OpNum+1]);
1218 if (Opc == -1 || ResTy == 0)
1219 return Error("Invalid CAST record");
1220 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy);
1223 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands]
1226 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr))
1227 return Error("Invalid GEP record");
1229 SmallVector<Value*, 16> GEPIdx;
1230 while (OpNum != Record.size()) {
1232 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1233 return Error("Invalid GEP record");
1234 GEPIdx.push_back(Op);
1237 I = new GetElementPtrInst(BasePtr, GEPIdx.begin(), GEPIdx.end());
1241 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval]
1243 Value *TrueVal, *FalseVal, *Cond;
1244 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
1245 getValue(Record, OpNum, TrueVal->getType(), FalseVal) ||
1246 getValue(Record, OpNum, Type::Int1Ty, Cond))
1247 return Error("Invalid SELECT record");
1249 I = new SelectInst(Cond, TrueVal, FalseVal);
1253 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval]
1256 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
1257 getValue(Record, OpNum, Type::Int32Ty, Idx))
1258 return Error("Invalid EXTRACTELT record");
1259 I = new ExtractElementInst(Vec, Idx);
1263 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval]
1265 Value *Vec, *Elt, *Idx;
1266 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
1267 getValue(Record, OpNum,
1268 cast<VectorType>(Vec->getType())->getElementType(), Elt) ||
1269 getValue(Record, OpNum, Type::Int32Ty, Idx))
1270 return Error("Invalid INSERTELT record");
1271 I = new InsertElementInst(Vec, Elt, Idx);
1275 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval]
1277 Value *Vec1, *Vec2, *Mask;
1278 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) ||
1279 getValue(Record, OpNum, Vec1->getType(), Vec2))
1280 return Error("Invalid SHUFFLEVEC record");
1282 const Type *MaskTy =
1283 VectorType::get(Type::Int32Ty,
1284 cast<VectorType>(Vec1->getType())->getNumElements());
1286 if (getValue(Record, OpNum, MaskTy, Mask))
1287 return Error("Invalid SHUFFLEVEC record");
1288 I = new ShuffleVectorInst(Vec1, Vec2, Mask);
1292 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred]
1295 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
1296 getValue(Record, OpNum, LHS->getType(), RHS) ||
1297 OpNum+1 != Record.size())
1298 return Error("Invalid CMP record");
1300 if (LHS->getType()->isFPOrFPVector())
1301 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS);
1303 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
1307 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>]
1308 if (Record.size() == 0) {
1309 I = new ReturnInst();
1314 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
1315 OpNum != Record.size())
1316 return Error("Invalid RET record");
1317 I = new ReturnInst(Op);
1320 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#]
1321 if (Record.size() != 1 && Record.size() != 3)
1322 return Error("Invalid BR record");
1323 BasicBlock *TrueDest = getBasicBlock(Record[0]);
1325 return Error("Invalid BR record");
1327 if (Record.size() == 1)
1328 I = new BranchInst(TrueDest);
1330 BasicBlock *FalseDest = getBasicBlock(Record[1]);
1331 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty);
1332 if (FalseDest == 0 || Cond == 0)
1333 return Error("Invalid BR record");
1334 I = new BranchInst(TrueDest, FalseDest, Cond);
1338 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops]
1339 if (Record.size() < 3 || (Record.size() & 1) == 0)
1340 return Error("Invalid SWITCH record");
1341 const Type *OpTy = getTypeByID(Record[0]);
1342 Value *Cond = getFnValueByID(Record[1], OpTy);
1343 BasicBlock *Default = getBasicBlock(Record[2]);
1344 if (OpTy == 0 || Cond == 0 || Default == 0)
1345 return Error("Invalid SWITCH record");
1346 unsigned NumCases = (Record.size()-3)/2;
1347 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases);
1348 for (unsigned i = 0, e = NumCases; i != e; ++i) {
1349 ConstantInt *CaseVal =
1350 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy));
1351 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]);
1352 if (CaseVal == 0 || DestBB == 0) {
1354 return Error("Invalid SWITCH record!");
1356 SI->addCase(CaseVal, DestBB);
1362 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [cc,fnty, op0,op1,op2, ...]
1363 if (Record.size() < 4) return Error("Invalid INVOKE record");
1364 unsigned CCInfo = Record[1];
1365 BasicBlock *NormalBB = getBasicBlock(Record[2]);
1366 BasicBlock *UnwindBB = getBasicBlock(Record[3]);
1370 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
1371 return Error("Invalid INVOKE record");
1373 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType());
1374 const FunctionType *FTy = !CalleeTy ? 0 :
1375 dyn_cast<FunctionType>(CalleeTy->getElementType());
1377 // Check that the right number of fixed parameters are here.
1378 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 ||
1379 Record.size() < OpNum+FTy->getNumParams())
1380 return Error("Invalid INVOKE record");
1382 assert(FTy->getParamAttrs() == getParamAttrs(Record[0]));
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.begin(), Ops.end());
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() < 2)
1486 return Error("Invalid CALL record");
1488 unsigned CCInfo = Record[1];
1492 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
1493 return Error("Invalid CALL record");
1495 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType());
1496 const FunctionType *FTy = 0;
1497 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType());
1498 if (!FTy || Record.size() < FTy->getNumParams()+OpNum)
1499 return Error("Invalid CALL record");
1501 assert(FTy->getParamAttrs() == getParamAttrs(Record[0]));
1503 SmallVector<Value*, 16> Args;
1504 // Read the fixed params.
1505 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
1506 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i)));
1507 if (Args.back() == 0) return Error("Invalid CALL record");
1510 // Read type/value pairs for varargs params.
1511 if (!FTy->isVarArg()) {
1512 if (OpNum != Record.size())
1513 return Error("Invalid CALL record");
1515 while (OpNum != Record.size()) {
1517 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
1518 return Error("Invalid CALL record");
1523 I = new CallInst(Callee, Args.begin(), Args.end());
1524 cast<CallInst>(I)->setCallingConv(CCInfo>>1);
1525 cast<CallInst>(I)->setTailCall(CCInfo & 1);
1528 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
1529 if (Record.size() < 3)
1530 return Error("Invalid VAARG record");
1531 const Type *OpTy = getTypeByID(Record[0]);
1532 Value *Op = getFnValueByID(Record[1], OpTy);
1533 const Type *ResTy = getTypeByID(Record[2]);
1534 if (!OpTy || !Op || !ResTy)
1535 return Error("Invalid VAARG record");
1536 I = new VAArgInst(Op, ResTy);
1541 // Add instruction to end of current BB. If there is no current BB, reject
1545 return Error("Invalid instruction with no BB");
1547 CurBB->getInstList().push_back(I);
1549 // If this was a terminator instruction, move to the next block.
1550 if (isa<TerminatorInst>(I)) {
1552 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0;
1555 // Non-void values get registered in the value table for future use.
1556 if (I && I->getType() != Type::VoidTy)
1557 ValueList.AssignValue(I, NextValueNo++);
1560 // Check the function list for unresolved values.
1561 if (Argument *A = dyn_cast<Argument>(ValueList.back())) {
1562 if (A->getParent() == 0) {
1563 // We found at least one unresolved value. Nuke them all to avoid leaks.
1564 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){
1565 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) {
1566 A->replaceAllUsesWith(UndefValue::get(A->getType()));
1570 return Error("Never resolved value found in function!");
1574 // Trim the value list down to the size it was before we parsed this function.
1575 ValueList.shrinkTo(ModuleValueListSize);
1576 std::vector<BasicBlock*>().swap(FunctionBBs);
1581 //===----------------------------------------------------------------------===//
1582 // ModuleProvider implementation
1583 //===----------------------------------------------------------------------===//
1586 bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) {
1587 // If it already is material, ignore the request.
1588 if (!F->hasNotBeenReadFromBitcode()) return false;
1590 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII =
1591 DeferredFunctionInfo.find(F);
1592 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!");
1594 // Move the bit stream to the saved position of the deferred function body and
1595 // restore the real linkage type for the function.
1596 Stream.JumpToBit(DFII->second.first);
1597 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second);
1599 if (ParseFunctionBody(F)) {
1600 if (ErrInfo) *ErrInfo = ErrorString;
1604 // Upgrade any old intrinsic calls in the function.
1605 for (UpgradedIntrinsicMap::iterator I = UpgradedIntrinsics.begin(),
1606 E = UpgradedIntrinsics.end(); I != E; ++I) {
1607 if (I->first != I->second) {
1608 for (Value::use_iterator UI = I->first->use_begin(),
1609 UE = I->first->use_end(); UI != UE; ) {
1610 if (CallInst* CI = dyn_cast<CallInst>(*UI++))
1611 UpgradeIntrinsicCall(CI, I->second);
1619 void BitcodeReader::dematerializeFunction(Function *F) {
1620 // If this function isn't materialized, or if it is a proto, this is a noop.
1621 if (F->hasNotBeenReadFromBitcode() || F->isDeclaration())
1624 assert(DeferredFunctionInfo.count(F) && "No info to read function later?");
1626 // Just forget the function body, we can remat it later.
1628 F->setLinkage(GlobalValue::GhostLinkage);
1632 Module *BitcodeReader::materializeModule(std::string *ErrInfo) {
1633 for (DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I =
1634 DeferredFunctionInfo.begin(), E = DeferredFunctionInfo.end(); I != E;
1636 Function *F = I->first;
1637 if (F->hasNotBeenReadFromBitcode() &&
1638 materializeFunction(F, ErrInfo))
1642 // Upgrade any intrinsic calls that slipped through (should not happen!) and
1643 // delete the old functions to clean up. We can't do this unless the entire
1644 // module is materialized because there could always be another function body
1645 // with calls to the old function.
1646 for (std::vector<std::pair<Function*, Function*> >::iterator I =
1647 UpgradedIntrinsics.begin(), E = UpgradedIntrinsics.end(); I != E; ++I) {
1648 if (I->first != I->second) {
1649 for (Value::use_iterator UI = I->first->use_begin(),
1650 UE = I->first->use_end(); UI != UE; ) {
1651 if (CallInst* CI = dyn_cast<CallInst>(*UI++))
1652 UpgradeIntrinsicCall(CI, I->second);
1654 ValueList.replaceUsesOfWith(I->first, I->second);
1655 I->first->eraseFromParent();
1658 std::vector<std::pair<Function*, Function*> >().swap(UpgradedIntrinsics);
1664 /// This method is provided by the parent ModuleProvde class and overriden
1665 /// here. It simply releases the module from its provided and frees up our
1667 /// @brief Release our hold on the generated module
1668 Module *BitcodeReader::releaseModule(std::string *ErrInfo) {
1669 // Since we're losing control of this Module, we must hand it back complete
1670 Module *M = ModuleProvider::releaseModule(ErrInfo);
1676 //===----------------------------------------------------------------------===//
1677 // External interface
1678 //===----------------------------------------------------------------------===//
1680 /// getBitcodeModuleProvider - lazy function-at-a-time loading from a file.
1682 ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer,
1683 std::string *ErrMsg) {
1684 BitcodeReader *R = new BitcodeReader(Buffer);
1685 if (R->ParseBitcode()) {
1687 *ErrMsg = R->getErrorString();
1689 // Don't let the BitcodeReader dtor delete 'Buffer'.
1690 R->releaseMemoryBuffer();
1697 /// ParseBitcodeFile - Read the specified bitcode file, returning the module.
1698 /// If an error occurs, return null and fill in *ErrMsg if non-null.
1699 Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){
1701 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg));
1704 // Read in the entire module.
1705 Module *M = R->materializeModule(ErrMsg);
1707 // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether
1708 // there was an error.
1709 R->releaseMemoryBuffer();
1711 // If there was no error, tell ModuleProvider not to delete it when its dtor
1714 M = R->releaseModule(ErrMsg);