1 //===- Reader.cpp - Code to read bytecode files ---------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This library implements the functionality defined in llvm/Bytecode/Reader.h
12 // Note that this library should be as fast as possible, reentrant, and
15 // TODO: Allow passing in an option to ignore the symbol table
17 //===----------------------------------------------------------------------===//
20 #include "llvm/Bytecode/BytecodeHandler.h"
21 #include "llvm/BasicBlock.h"
22 #include "llvm/CallingConv.h"
23 #include "llvm/Constants.h"
24 #include "llvm/InlineAsm.h"
25 #include "llvm/Instructions.h"
26 #include "llvm/SymbolTable.h"
27 #include "llvm/TypeSymbolTable.h"
28 #include "llvm/Bytecode/Format.h"
29 #include "llvm/Config/alloca.h"
30 #include "llvm/Support/GetElementPtrTypeIterator.h"
31 #include "llvm/Support/Compressor.h"
32 #include "llvm/Support/MathExtras.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/StringExtras.h"
40 /// @brief A class for maintaining the slot number definition
41 /// as a placeholder for the actual definition for forward constants defs.
42 class ConstantPlaceHolder : public ConstantExpr {
43 ConstantPlaceHolder(); // DO NOT IMPLEMENT
44 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT
47 ConstantPlaceHolder(const Type *Ty)
48 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1),
49 Op(UndefValue::get(Type::Int32Ty), this) {
54 // Provide some details on error
55 inline void BytecodeReader::error(const std::string& err) {
56 ErrorMsg = err + " (Vers=" + itostr(RevisionNum) + ", Pos="
57 + itostr(At-MemStart) + ")";
61 //===----------------------------------------------------------------------===//
62 // Bytecode Reading Methods
63 //===----------------------------------------------------------------------===//
65 /// Determine if the current block being read contains any more data.
66 inline bool BytecodeReader::moreInBlock() {
70 /// Throw an error if we've read past the end of the current block
71 inline void BytecodeReader::checkPastBlockEnd(const char * block_name) {
73 error(std::string("Attempt to read past the end of ") + block_name +
77 /// Read a whole unsigned integer
78 inline unsigned BytecodeReader::read_uint() {
80 error("Ran out of data reading uint!");
82 return At[-4] | (At[-3] << 8) | (At[-2] << 16) | (At[-1] << 24);
85 /// Read a variable-bit-rate encoded unsigned integer
86 inline unsigned BytecodeReader::read_vbr_uint() {
93 error("Ran out of data reading vbr_uint!");
94 Result |= (unsigned)((*At++) & 0x7F) << Shift;
96 } while (At[-1] & 0x80);
97 if (Handler) Handler->handleVBR32(At-Save);
101 /// Read a variable-bit-rate encoded unsigned 64-bit integer.
102 inline uint64_t BytecodeReader::read_vbr_uint64() {
109 error("Ran out of data reading vbr_uint64!");
110 Result |= (uint64_t)((*At++) & 0x7F) << Shift;
112 } while (At[-1] & 0x80);
113 if (Handler) Handler->handleVBR64(At-Save);
117 /// Read a variable-bit-rate encoded signed 64-bit integer.
118 inline int64_t BytecodeReader::read_vbr_int64() {
119 uint64_t R = read_vbr_uint64();
122 return -(int64_t)(R >> 1);
123 else // There is no such thing as -0 with integers. "-0" really means
124 // 0x8000000000000000.
127 return (int64_t)(R >> 1);
130 /// Read a pascal-style string (length followed by text)
131 inline std::string BytecodeReader::read_str() {
132 unsigned Size = read_vbr_uint();
133 const unsigned char *OldAt = At;
135 if (At > BlockEnd) // Size invalid?
136 error("Ran out of data reading a string!");
137 return std::string((char*)OldAt, Size);
140 /// Read an arbitrary block of data
141 inline void BytecodeReader::read_data(void *Ptr, void *End) {
142 unsigned char *Start = (unsigned char *)Ptr;
143 unsigned Amount = (unsigned char *)End - Start;
144 if (At+Amount > BlockEnd)
145 error("Ran out of data!");
146 std::copy(At, At+Amount, Start);
150 /// Read a float value in little-endian order
151 inline void BytecodeReader::read_float(float& FloatVal) {
152 /// FIXME: This isn't optimal, it has size problems on some platforms
153 /// where FP is not IEEE.
154 FloatVal = BitsToFloat(At[0] | (At[1] << 8) | (At[2] << 16) | (At[3] << 24));
155 At+=sizeof(uint32_t);
158 /// Read a double value in little-endian order
159 inline void BytecodeReader::read_double(double& DoubleVal) {
160 /// FIXME: This isn't optimal, it has size problems on some platforms
161 /// where FP is not IEEE.
162 DoubleVal = BitsToDouble((uint64_t(At[0]) << 0) | (uint64_t(At[1]) << 8) |
163 (uint64_t(At[2]) << 16) | (uint64_t(At[3]) << 24) |
164 (uint64_t(At[4]) << 32) | (uint64_t(At[5]) << 40) |
165 (uint64_t(At[6]) << 48) | (uint64_t(At[7]) << 56));
166 At+=sizeof(uint64_t);
169 /// Read a block header and obtain its type and size
170 inline void BytecodeReader::read_block(unsigned &Type, unsigned &Size) {
171 Size = read_uint(); // Read the header
172 Type = Size & 0x1F; // mask low order five bits to get type
173 Size >>= 5; // high order 27 bits is the size
175 if (At + Size > BlockEnd)
176 error("Attempt to size a block past end of memory");
177 BlockEnd = At + Size;
178 if (Handler) Handler->handleBlock(Type, BlockStart, Size);
181 //===----------------------------------------------------------------------===//
183 //===----------------------------------------------------------------------===//
185 /// Determine if a type id has an implicit null value
186 inline bool BytecodeReader::hasImplicitNull(unsigned TyID) {
187 return TyID != Type::LabelTyID && TyID != Type::VoidTyID;
190 /// Obtain a type given a typeid and account for things like function level vs
191 /// module level, and the offsetting for the primitive types.
192 const Type *BytecodeReader::getType(unsigned ID) {
193 if (ID <= Type::LastPrimitiveTyID)
194 if (const Type *T = Type::getPrimitiveType((Type::TypeID)ID))
195 return T; // Asked for a primitive type...
197 // Otherwise, derived types need offset...
198 ID -= Type::FirstDerivedTyID;
200 // Is it a module-level type?
201 if (ID < ModuleTypes.size())
202 return ModuleTypes[ID].get();
204 // Nope, is it a function-level type?
205 ID -= ModuleTypes.size();
206 if (ID < FunctionTypes.size())
207 return FunctionTypes[ID].get();
209 error("Illegal type reference!");
213 /// This method just saves some coding. It uses read_vbr_uint to read in a
214 /// type id, errors that its not the type type, and then calls getType to
215 /// return the type value.
216 inline const Type* BytecodeReader::readType() {
217 return getType(read_vbr_uint());
220 /// Get the slot number associated with a type accounting for primitive
221 /// types and function level vs module level.
222 unsigned BytecodeReader::getTypeSlot(const Type *Ty) {
223 if (Ty->isPrimitiveType())
224 return Ty->getTypeID();
226 // Check the function level types first...
227 TypeListTy::iterator I = std::find(FunctionTypes.begin(),
228 FunctionTypes.end(), Ty);
230 if (I != FunctionTypes.end())
231 return Type::FirstDerivedTyID + ModuleTypes.size() +
232 (&*I - &FunctionTypes[0]);
234 // If we don't have our cache yet, build it now.
235 if (ModuleTypeIDCache.empty()) {
237 ModuleTypeIDCache.reserve(ModuleTypes.size());
238 for (TypeListTy::iterator I = ModuleTypes.begin(), E = ModuleTypes.end();
240 ModuleTypeIDCache.push_back(std::make_pair(*I, N));
242 std::sort(ModuleTypeIDCache.begin(), ModuleTypeIDCache.end());
245 // Binary search the cache for the entry.
246 std::vector<std::pair<const Type*, unsigned> >::iterator IT =
247 std::lower_bound(ModuleTypeIDCache.begin(), ModuleTypeIDCache.end(),
248 std::make_pair(Ty, 0U));
249 if (IT == ModuleTypeIDCache.end() || IT->first != Ty)
250 error("Didn't find type in ModuleTypes.");
252 return Type::FirstDerivedTyID + IT->second;
255 /// Retrieve a value of a given type and slot number, possibly creating
256 /// it if it doesn't already exist.
257 Value * BytecodeReader::getValue(unsigned type, unsigned oNum, bool Create) {
258 assert(type != Type::LabelTyID && "getValue() cannot get blocks!");
261 // By default, the global type id is the type id passed in
262 unsigned GlobalTyID = type;
264 if (hasImplicitNull(GlobalTyID)) {
265 const Type *Ty = getType(type);
266 if (!isa<OpaqueType>(Ty)) {
268 return Constant::getNullValue(Ty);
273 if (GlobalTyID < ModuleValues.size() && ModuleValues[GlobalTyID]) {
274 if (Num < ModuleValues[GlobalTyID]->size())
275 return ModuleValues[GlobalTyID]->getOperand(Num);
276 Num -= ModuleValues[GlobalTyID]->size();
279 if (FunctionValues.size() > type &&
280 FunctionValues[type] &&
281 Num < FunctionValues[type]->size())
282 return FunctionValues[type]->getOperand(Num);
284 if (!Create) return 0; // Do not create a placeholder?
286 // Did we already create a place holder?
287 std::pair<unsigned,unsigned> KeyValue(type, oNum);
288 ForwardReferenceMap::iterator I = ForwardReferences.lower_bound(KeyValue);
289 if (I != ForwardReferences.end() && I->first == KeyValue)
290 return I->second; // We have already created this placeholder
292 // If the type exists (it should)
293 if (const Type* Ty = getType(type)) {
294 // Create the place holder
295 Value *Val = new Argument(Ty);
296 ForwardReferences.insert(I, std::make_pair(KeyValue, Val));
299 error("Can't create placeholder for value of type slot #" + utostr(type));
300 return 0; // just silence warning, error calls longjmp
304 /// Just like getValue, except that it returns a null pointer
305 /// only on error. It always returns a constant (meaning that if the value is
306 /// defined, but is not a constant, that is an error). If the specified
307 /// constant hasn't been parsed yet, a placeholder is defined and used.
308 /// Later, after the real value is parsed, the placeholder is eliminated.
309 Constant* BytecodeReader::getConstantValue(unsigned TypeSlot, unsigned Slot) {
310 if (Value *V = getValue(TypeSlot, Slot, false))
311 if (Constant *C = dyn_cast<Constant>(V))
312 return C; // If we already have the value parsed, just return it
314 error("Value for slot " + utostr(Slot) +
315 " is expected to be a constant!");
317 std::pair<unsigned, unsigned> Key(TypeSlot, Slot);
318 ConstantRefsType::iterator I = ConstantFwdRefs.lower_bound(Key);
320 if (I != ConstantFwdRefs.end() && I->first == Key) {
323 // Create a placeholder for the constant reference and
324 // keep track of the fact that we have a forward ref to recycle it
325 Constant *C = new ConstantPlaceHolder(getType(TypeSlot));
327 // Keep track of the fact that we have a forward ref to recycle it
328 ConstantFwdRefs.insert(I, std::make_pair(Key, C));
333 //===----------------------------------------------------------------------===//
334 // IR Construction Methods
335 //===----------------------------------------------------------------------===//
337 /// As values are created, they are inserted into the appropriate place
338 /// with this method. The ValueTable argument must be one of ModuleValues
339 /// or FunctionValues data members of this class.
340 unsigned BytecodeReader::insertValue(Value *Val, unsigned type,
341 ValueTable &ValueTab) {
342 if (ValueTab.size() <= type)
343 ValueTab.resize(type+1);
345 if (!ValueTab[type]) ValueTab[type] = new ValueList();
347 ValueTab[type]->push_back(Val);
349 bool HasOffset = hasImplicitNull(type) && !isa<OpaqueType>(Val->getType());
350 return ValueTab[type]->size()-1 + HasOffset;
353 /// Insert the arguments of a function as new values in the reader.
354 void BytecodeReader::insertArguments(Function* F) {
355 const FunctionType *FT = F->getFunctionType();
356 Function::arg_iterator AI = F->arg_begin();
357 for (FunctionType::param_iterator It = FT->param_begin();
358 It != FT->param_end(); ++It, ++AI)
359 insertValue(AI, getTypeSlot(AI->getType()), FunctionValues);
362 //===----------------------------------------------------------------------===//
363 // Bytecode Parsing Methods
364 //===----------------------------------------------------------------------===//
366 /// This method parses a single instruction. The instruction is
367 /// inserted at the end of the \p BB provided. The arguments of
368 /// the instruction are provided in the \p Oprnds vector.
369 void BytecodeReader::ParseInstruction(std::vector<unsigned> &Oprnds,
373 // Clear instruction data
377 unsigned Op = read_uint();
379 // bits Instruction format: Common to all formats
380 // --------------------------
381 // 01-00: Opcode type, fixed to 1.
383 Opcode = (Op >> 2) & 63;
384 Oprnds.resize((Op >> 0) & 03);
386 // Extract the operands
387 switch (Oprnds.size()) {
389 // bits Instruction format:
390 // --------------------------
391 // 19-08: Resulting type plane
392 // 31-20: Operand #1 (if set to (2^12-1), then zero operands)
394 iType = (Op >> 8) & 4095;
395 Oprnds[0] = (Op >> 20) & 4095;
396 if (Oprnds[0] == 4095) // Handle special encoding for 0 operands...
400 // bits Instruction format:
401 // --------------------------
402 // 15-08: Resulting type plane
406 iType = (Op >> 8) & 255;
407 Oprnds[0] = (Op >> 16) & 255;
408 Oprnds[1] = (Op >> 24) & 255;
411 // bits Instruction format:
412 // --------------------------
413 // 13-08: Resulting type plane
418 iType = (Op >> 8) & 63;
419 Oprnds[0] = (Op >> 14) & 63;
420 Oprnds[1] = (Op >> 20) & 63;
421 Oprnds[2] = (Op >> 26) & 63;
424 At -= 4; // Hrm, try this again...
425 Opcode = read_vbr_uint();
427 iType = read_vbr_uint();
429 unsigned NumOprnds = read_vbr_uint();
430 Oprnds.resize(NumOprnds);
433 error("Zero-argument instruction found; this is invalid.");
435 for (unsigned i = 0; i != NumOprnds; ++i)
436 Oprnds[i] = read_vbr_uint();
440 const Type *InstTy = getType(iType);
442 // Make the necessary adjustments for dealing with backwards compatibility
444 Instruction* Result = 0;
446 // We have enough info to inform the handler now.
448 Handler->handleInstruction(Opcode, InstTy, Oprnds, At-SaveAt);
450 // First, handle the easy binary operators case
451 if (Opcode >= Instruction::BinaryOpsBegin &&
452 Opcode < Instruction::BinaryOpsEnd && Oprnds.size() == 2) {
453 Result = BinaryOperator::create(Instruction::BinaryOps(Opcode),
454 getValue(iType, Oprnds[0]),
455 getValue(iType, Oprnds[1]));
457 // Indicate that we don't think this is a call instruction (yet).
458 // Process based on the Opcode read
460 default: // There was an error, this shouldn't happen.
462 error("Illegal instruction read!");
464 case Instruction::VAArg:
465 if (Oprnds.size() != 2)
466 error("Invalid VAArg instruction!");
467 Result = new VAArgInst(getValue(iType, Oprnds[0]),
470 case Instruction::ExtractElement: {
471 if (Oprnds.size() != 2)
472 error("Invalid extractelement instruction!");
473 Value *V1 = getValue(iType, Oprnds[0]);
474 Value *V2 = getValue(Int32TySlot, Oprnds[1]);
476 if (!ExtractElementInst::isValidOperands(V1, V2))
477 error("Invalid extractelement instruction!");
479 Result = new ExtractElementInst(V1, V2);
482 case Instruction::InsertElement: {
483 const PackedType *PackedTy = dyn_cast<PackedType>(InstTy);
484 if (!PackedTy || Oprnds.size() != 3)
485 error("Invalid insertelement instruction!");
487 Value *V1 = getValue(iType, Oprnds[0]);
488 Value *V2 = getValue(getTypeSlot(PackedTy->getElementType()),Oprnds[1]);
489 Value *V3 = getValue(Int32TySlot, Oprnds[2]);
491 if (!InsertElementInst::isValidOperands(V1, V2, V3))
492 error("Invalid insertelement instruction!");
493 Result = new InsertElementInst(V1, V2, V3);
496 case Instruction::ShuffleVector: {
497 const PackedType *PackedTy = dyn_cast<PackedType>(InstTy);
498 if (!PackedTy || Oprnds.size() != 3)
499 error("Invalid shufflevector instruction!");
500 Value *V1 = getValue(iType, Oprnds[0]);
501 Value *V2 = getValue(iType, Oprnds[1]);
502 const PackedType *EltTy =
503 PackedType::get(Type::Int32Ty, PackedTy->getNumElements());
504 Value *V3 = getValue(getTypeSlot(EltTy), Oprnds[2]);
505 if (!ShuffleVectorInst::isValidOperands(V1, V2, V3))
506 error("Invalid shufflevector instruction!");
507 Result = new ShuffleVectorInst(V1, V2, V3);
510 case Instruction::Trunc:
511 if (Oprnds.size() != 2)
512 error("Invalid cast instruction!");
513 Result = new TruncInst(getValue(iType, Oprnds[0]),
516 case Instruction::ZExt:
517 if (Oprnds.size() != 2)
518 error("Invalid cast instruction!");
519 Result = new ZExtInst(getValue(iType, Oprnds[0]),
522 case Instruction::SExt:
523 if (Oprnds.size() != 2)
524 error("Invalid Cast instruction!");
525 Result = new SExtInst(getValue(iType, Oprnds[0]),
528 case Instruction::FPTrunc:
529 if (Oprnds.size() != 2)
530 error("Invalid cast instruction!");
531 Result = new FPTruncInst(getValue(iType, Oprnds[0]),
534 case Instruction::FPExt:
535 if (Oprnds.size() != 2)
536 error("Invalid cast instruction!");
537 Result = new FPExtInst(getValue(iType, Oprnds[0]),
540 case Instruction::UIToFP:
541 if (Oprnds.size() != 2)
542 error("Invalid cast instruction!");
543 Result = new UIToFPInst(getValue(iType, Oprnds[0]),
546 case Instruction::SIToFP:
547 if (Oprnds.size() != 2)
548 error("Invalid cast instruction!");
549 Result = new SIToFPInst(getValue(iType, Oprnds[0]),
552 case Instruction::FPToUI:
553 if (Oprnds.size() != 2)
554 error("Invalid cast instruction!");
555 Result = new FPToUIInst(getValue(iType, Oprnds[0]),
558 case Instruction::FPToSI:
559 if (Oprnds.size() != 2)
560 error("Invalid cast instruction!");
561 Result = new FPToSIInst(getValue(iType, Oprnds[0]),
564 case Instruction::IntToPtr:
565 if (Oprnds.size() != 2)
566 error("Invalid cast instruction!");
567 Result = new IntToPtrInst(getValue(iType, Oprnds[0]),
570 case Instruction::PtrToInt:
571 if (Oprnds.size() != 2)
572 error("Invalid cast instruction!");
573 Result = new PtrToIntInst(getValue(iType, Oprnds[0]),
576 case Instruction::BitCast:
577 if (Oprnds.size() != 2)
578 error("Invalid cast instruction!");
579 Result = new BitCastInst(getValue(iType, Oprnds[0]),
582 case Instruction::Select:
583 if (Oprnds.size() != 3)
584 error("Invalid Select instruction!");
585 Result = new SelectInst(getValue(BoolTySlot, Oprnds[0]),
586 getValue(iType, Oprnds[1]),
587 getValue(iType, Oprnds[2]));
589 case Instruction::PHI: {
590 if (Oprnds.size() == 0 || (Oprnds.size() & 1))
591 error("Invalid phi node encountered!");
593 PHINode *PN = new PHINode(InstTy);
594 PN->reserveOperandSpace(Oprnds.size());
595 for (unsigned i = 0, e = Oprnds.size(); i != e; i += 2)
597 getValue(iType, Oprnds[i]), getBasicBlock(Oprnds[i+1]));
601 case Instruction::ICmp:
602 case Instruction::FCmp:
603 if (Oprnds.size() != 3)
604 error("Cmp instructions requires 3 operands");
605 // These instructions encode the comparison predicate as the 3rd operand.
606 Result = CmpInst::create(Instruction::OtherOps(Opcode),
607 static_cast<unsigned short>(Oprnds[2]),
608 getValue(iType, Oprnds[0]), getValue(iType, Oprnds[1]));
610 case Instruction::Shl:
611 case Instruction::LShr:
612 case Instruction::AShr:
613 Result = new ShiftInst(Instruction::OtherOps(Opcode),
614 getValue(iType, Oprnds[0]),
615 getValue(Int8TySlot, Oprnds[1]));
617 case Instruction::Ret:
618 if (Oprnds.size() == 0)
619 Result = new ReturnInst();
620 else if (Oprnds.size() == 1)
621 Result = new ReturnInst(getValue(iType, Oprnds[0]));
623 error("Unrecognized instruction!");
626 case Instruction::Br:
627 if (Oprnds.size() == 1)
628 Result = new BranchInst(getBasicBlock(Oprnds[0]));
629 else if (Oprnds.size() == 3)
630 Result = new BranchInst(getBasicBlock(Oprnds[0]),
631 getBasicBlock(Oprnds[1]), getValue(BoolTySlot, Oprnds[2]));
633 error("Invalid number of operands for a 'br' instruction!");
635 case Instruction::Switch: {
636 if (Oprnds.size() & 1)
637 error("Switch statement with odd number of arguments!");
639 SwitchInst *I = new SwitchInst(getValue(iType, Oprnds[0]),
640 getBasicBlock(Oprnds[1]),
642 for (unsigned i = 2, e = Oprnds.size(); i != e; i += 2)
643 I->addCase(cast<ConstantInt>(getValue(iType, Oprnds[i])),
644 getBasicBlock(Oprnds[i+1]));
648 case 58: // Call with extra operand for calling conv
649 case 59: // tail call, Fast CC
650 case 60: // normal call, Fast CC
651 case 61: // tail call, C Calling Conv
652 case Instruction::Call: { // Normal Call, C Calling Convention
653 if (Oprnds.size() == 0)
654 error("Invalid call instruction encountered!");
655 Value *F = getValue(iType, Oprnds[0]);
657 unsigned CallingConv = CallingConv::C;
658 bool isTailCall = false;
660 if (Opcode == 61 || Opcode == 59)
664 isTailCall = Oprnds.back() & 1;
665 CallingConv = Oprnds.back() >> 1;
667 } else if (Opcode == 59 || Opcode == 60) {
668 CallingConv = CallingConv::Fast;
671 // Check to make sure we have a pointer to function type
672 const PointerType *PTy = dyn_cast<PointerType>(F->getType());
673 if (PTy == 0) error("Call to non function pointer value!");
674 const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
675 if (FTy == 0) error("Call to non function pointer value!");
677 std::vector<Value *> Params;
678 if (!FTy->isVarArg()) {
679 FunctionType::param_iterator It = FTy->param_begin();
681 for (unsigned i = 1, e = Oprnds.size(); i != e; ++i) {
682 if (It == FTy->param_end())
683 error("Invalid call instruction!");
684 Params.push_back(getValue(getTypeSlot(*It++), Oprnds[i]));
686 if (It != FTy->param_end())
687 error("Invalid call instruction!");
689 Oprnds.erase(Oprnds.begin(), Oprnds.begin()+1);
691 unsigned FirstVariableOperand;
692 if (Oprnds.size() < FTy->getNumParams())
693 error("Call instruction missing operands!");
695 // Read all of the fixed arguments
696 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
698 getValue(getTypeSlot(FTy->getParamType(i)),Oprnds[i]));
700 FirstVariableOperand = FTy->getNumParams();
702 if ((Oprnds.size()-FirstVariableOperand) & 1)
703 error("Invalid call instruction!"); // Must be pairs of type/value
705 for (unsigned i = FirstVariableOperand, e = Oprnds.size();
707 Params.push_back(getValue(Oprnds[i], Oprnds[i+1]));
710 Result = new CallInst(F, Params);
711 if (isTailCall) cast<CallInst>(Result)->setTailCall();
712 if (CallingConv) cast<CallInst>(Result)->setCallingConv(CallingConv);
715 case Instruction::Invoke: { // Invoke C CC
716 if (Oprnds.size() < 3)
717 error("Invalid invoke instruction!");
718 Value *F = getValue(iType, Oprnds[0]);
720 // Check to make sure we have a pointer to function type
721 const PointerType *PTy = dyn_cast<PointerType>(F->getType());
723 error("Invoke to non function pointer value!");
724 const FunctionType *FTy = dyn_cast<FunctionType>(PTy->getElementType());
726 error("Invoke to non function pointer value!");
728 std::vector<Value *> Params;
729 BasicBlock *Normal, *Except;
730 unsigned CallingConv = Oprnds.back();
733 if (!FTy->isVarArg()) {
734 Normal = getBasicBlock(Oprnds[1]);
735 Except = getBasicBlock(Oprnds[2]);
737 FunctionType::param_iterator It = FTy->param_begin();
738 for (unsigned i = 3, e = Oprnds.size(); i != e; ++i) {
739 if (It == FTy->param_end())
740 error("Invalid invoke instruction!");
741 Params.push_back(getValue(getTypeSlot(*It++), Oprnds[i]));
743 if (It != FTy->param_end())
744 error("Invalid invoke instruction!");
746 Oprnds.erase(Oprnds.begin(), Oprnds.begin()+1);
748 Normal = getBasicBlock(Oprnds[0]);
749 Except = getBasicBlock(Oprnds[1]);
751 unsigned FirstVariableArgument = FTy->getNumParams()+2;
752 for (unsigned i = 2; i != FirstVariableArgument; ++i)
753 Params.push_back(getValue(getTypeSlot(FTy->getParamType(i-2)),
756 // Must be type/value pairs. If not, error out.
757 if (Oprnds.size()-FirstVariableArgument & 1)
758 error("Invalid invoke instruction!");
760 for (unsigned i = FirstVariableArgument; i < Oprnds.size(); i += 2)
761 Params.push_back(getValue(Oprnds[i], Oprnds[i+1]));
764 Result = new InvokeInst(F, Normal, Except, Params);
765 if (CallingConv) cast<InvokeInst>(Result)->setCallingConv(CallingConv);
768 case Instruction::Malloc: {
770 if (Oprnds.size() == 2)
771 Align = (1 << Oprnds[1]) >> 1;
772 else if (Oprnds.size() > 2)
773 error("Invalid malloc instruction!");
774 if (!isa<PointerType>(InstTy))
775 error("Invalid malloc instruction!");
777 Result = new MallocInst(cast<PointerType>(InstTy)->getElementType(),
778 getValue(Int32TySlot, Oprnds[0]), Align);
781 case Instruction::Alloca: {
783 if (Oprnds.size() == 2)
784 Align = (1 << Oprnds[1]) >> 1;
785 else if (Oprnds.size() > 2)
786 error("Invalid alloca instruction!");
787 if (!isa<PointerType>(InstTy))
788 error("Invalid alloca instruction!");
790 Result = new AllocaInst(cast<PointerType>(InstTy)->getElementType(),
791 getValue(Int32TySlot, Oprnds[0]), Align);
794 case Instruction::Free:
795 if (!isa<PointerType>(InstTy))
796 error("Invalid free instruction!");
797 Result = new FreeInst(getValue(iType, Oprnds[0]));
799 case Instruction::GetElementPtr: {
800 if (Oprnds.size() == 0 || !isa<PointerType>(InstTy))
801 error("Invalid getelementptr instruction!");
803 SmallVector<Value*, 8> Idx;
805 const Type *NextTy = InstTy;
806 for (unsigned i = 1, e = Oprnds.size(); i != e; ++i) {
807 const CompositeType *TopTy = dyn_cast_or_null<CompositeType>(NextTy);
809 error("Invalid getelementptr instruction!");
811 unsigned ValIdx = Oprnds[i];
813 // Struct indices are always uints, sequential type indices can be
814 // any of the 32 or 64-bit integer types. The actual choice of
815 // type is encoded in the low bit of the slot number.
816 if (isa<StructType>(TopTy))
819 switch (ValIdx & 1) {
821 case 0: IdxTy = Int32TySlot; break;
822 case 1: IdxTy = Int64TySlot; break;
826 Idx.push_back(getValue(IdxTy, ValIdx));
827 NextTy = GetElementPtrInst::getIndexedType(InstTy, &Idx[0], Idx.size(),
831 Result = new GetElementPtrInst(getValue(iType, Oprnds[0]),
832 &Idx[0], Idx.size());
835 case 62: // volatile load
836 case Instruction::Load:
837 if (Oprnds.size() != 1 || !isa<PointerType>(InstTy))
838 error("Invalid load instruction!");
839 Result = new LoadInst(getValue(iType, Oprnds[0]), "", Opcode == 62);
841 case 63: // volatile store
842 case Instruction::Store: {
843 if (!isa<PointerType>(InstTy) || Oprnds.size() != 2)
844 error("Invalid store instruction!");
846 Value *Ptr = getValue(iType, Oprnds[1]);
847 const Type *ValTy = cast<PointerType>(Ptr->getType())->getElementType();
848 Result = new StoreInst(getValue(getTypeSlot(ValTy), Oprnds[0]), Ptr,
852 case Instruction::Unwind:
853 if (Oprnds.size() != 0) error("Invalid unwind instruction!");
854 Result = new UnwindInst();
856 case Instruction::Unreachable:
857 if (Oprnds.size() != 0) error("Invalid unreachable instruction!");
858 Result = new UnreachableInst();
860 } // end switch(Opcode)
863 BB->getInstList().push_back(Result);
866 if (Result->getType() == InstTy)
869 TypeSlot = getTypeSlot(Result->getType());
871 insertValue(Result, TypeSlot, FunctionValues);
874 /// Get a particular numbered basic block, which might be a forward reference.
875 /// This works together with ParseInstructionList to handle these forward
876 /// references in a clean manner. This function is used when constructing
877 /// phi, br, switch, and other instructions that reference basic blocks.
878 /// Blocks are numbered sequentially as they appear in the function.
879 BasicBlock *BytecodeReader::getBasicBlock(unsigned ID) {
880 // Make sure there is room in the table...
881 if (ParsedBasicBlocks.size() <= ID) ParsedBasicBlocks.resize(ID+1);
883 // First check to see if this is a backwards reference, i.e. this block
884 // has already been created, or if the forward reference has already
886 if (ParsedBasicBlocks[ID])
887 return ParsedBasicBlocks[ID];
889 // Otherwise, the basic block has not yet been created. Do so and add it to
890 // the ParsedBasicBlocks list.
891 return ParsedBasicBlocks[ID] = new BasicBlock();
894 /// Parse all of the BasicBlock's & Instruction's in the body of a function.
895 /// In post 1.0 bytecode files, we no longer emit basic block individually,
896 /// in order to avoid per-basic-block overhead.
897 /// @returns the number of basic blocks encountered.
898 unsigned BytecodeReader::ParseInstructionList(Function* F) {
899 unsigned BlockNo = 0;
900 std::vector<unsigned> Args;
902 while (moreInBlock()) {
903 if (Handler) Handler->handleBasicBlockBegin(BlockNo);
905 if (ParsedBasicBlocks.size() == BlockNo)
906 ParsedBasicBlocks.push_back(BB = new BasicBlock());
907 else if (ParsedBasicBlocks[BlockNo] == 0)
908 BB = ParsedBasicBlocks[BlockNo] = new BasicBlock();
910 BB = ParsedBasicBlocks[BlockNo];
912 F->getBasicBlockList().push_back(BB);
914 // Read instructions into this basic block until we get to a terminator
915 while (moreInBlock() && !BB->getTerminator())
916 ParseInstruction(Args, BB);
918 if (!BB->getTerminator())
919 error("Non-terminated basic block found!");
921 if (Handler) Handler->handleBasicBlockEnd(BlockNo-1);
927 /// Parse a type symbol table.
928 void BytecodeReader::ParseTypeSymbolTable(TypeSymbolTable *TST) {
929 // Type Symtab block header: [num entries]
930 unsigned NumEntries = read_vbr_uint();
931 for (unsigned i = 0; i < NumEntries; ++i) {
932 // Symtab entry: [type slot #][name]
933 unsigned slot = read_vbr_uint();
934 std::string Name = read_str();
935 const Type* T = getType(slot);
936 TST->insert(Name, T);
940 /// Parse a value symbol table. This works for both module level and function
941 /// level symbol tables. For function level symbol tables, the CurrentFunction
942 /// parameter must be non-zero and the ST parameter must correspond to
943 /// CurrentFunction's symbol table. For Module level symbol tables, the
944 /// CurrentFunction argument must be zero.
945 void BytecodeReader::ParseValueSymbolTable(Function *CurrentFunction,
948 if (Handler) Handler->handleSymbolTableBegin(CurrentFunction,ST);
950 // Allow efficient basic block lookup by number.
951 std::vector<BasicBlock*> BBMap;
953 for (Function::iterator I = CurrentFunction->begin(),
954 E = CurrentFunction->end(); I != E; ++I)
957 while (moreInBlock()) {
958 // Symtab block header: [num entries][type id number]
959 unsigned NumEntries = read_vbr_uint();
960 unsigned Typ = read_vbr_uint();
962 for (unsigned i = 0; i != NumEntries; ++i) {
963 // Symtab entry: [def slot #][name]
964 unsigned slot = read_vbr_uint();
965 std::string Name = read_str();
967 if (Typ == LabelTySlot) {
968 if (slot < BBMap.size())
971 V = getValue(Typ, slot, false); // Find mapping...
974 error("Failed value look-up for name '" + Name + "'");
978 checkPastBlockEnd("Symbol Table");
979 if (Handler) Handler->handleSymbolTableEnd();
982 // Parse a single type. The typeid is read in first. If its a primitive type
983 // then nothing else needs to be read, we know how to instantiate it. If its
984 // a derived type, then additional data is read to fill out the type
986 const Type *BytecodeReader::ParseType() {
987 unsigned PrimType = read_vbr_uint();
988 const Type *Result = 0;
989 if ((Result = Type::getPrimitiveType((Type::TypeID)PrimType)))
993 case Type::IntegerTyID: {
994 unsigned NumBits = read_vbr_uint();
995 Result = IntegerType::get(NumBits);
998 case Type::FunctionTyID: {
999 const Type *RetType = readType();
1000 unsigned RetAttr = read_vbr_uint();
1002 unsigned NumParams = read_vbr_uint();
1004 std::vector<const Type*> Params;
1005 std::vector<FunctionType::ParameterAttributes> Attrs;
1006 Attrs.push_back(FunctionType::ParameterAttributes(RetAttr));
1007 while (NumParams--) {
1008 Params.push_back(readType());
1009 if (Params.back() != Type::VoidTy)
1010 Attrs.push_back(FunctionType::ParameterAttributes(read_vbr_uint()));
1013 bool isVarArg = Params.size() && Params.back() == Type::VoidTy;
1014 if (isVarArg) Params.pop_back();
1016 Result = FunctionType::get(RetType, Params, isVarArg, Attrs);
1019 case Type::ArrayTyID: {
1020 const Type *ElementType = readType();
1021 unsigned NumElements = read_vbr_uint();
1022 Result = ArrayType::get(ElementType, NumElements);
1025 case Type::PackedTyID: {
1026 const Type *ElementType = readType();
1027 unsigned NumElements = read_vbr_uint();
1028 Result = PackedType::get(ElementType, NumElements);
1031 case Type::StructTyID: {
1032 std::vector<const Type*> Elements;
1033 unsigned Typ = read_vbr_uint();
1034 while (Typ) { // List is terminated by void/0 typeid
1035 Elements.push_back(getType(Typ));
1036 Typ = read_vbr_uint();
1039 Result = StructType::get(Elements, false);
1042 case Type::PackedStructTyID: {
1043 std::vector<const Type*> Elements;
1044 unsigned Typ = read_vbr_uint();
1045 while (Typ) { // List is terminated by void/0 typeid
1046 Elements.push_back(getType(Typ));
1047 Typ = read_vbr_uint();
1050 Result = StructType::get(Elements, true);
1053 case Type::PointerTyID: {
1054 Result = PointerType::get(readType());
1058 case Type::OpaqueTyID: {
1059 Result = OpaqueType::get();
1064 error("Don't know how to deserialize primitive type " + utostr(PrimType));
1067 if (Handler) Handler->handleType(Result);
1071 // ParseTypes - We have to use this weird code to handle recursive
1072 // types. We know that recursive types will only reference the current slab of
1073 // values in the type plane, but they can forward reference types before they
1074 // have been read. For example, Type #0 might be '{ Ty#1 }' and Type #1 might
1075 // be 'Ty#0*'. When reading Type #0, type number one doesn't exist. To fix
1076 // this ugly problem, we pessimistically insert an opaque type for each type we
1077 // are about to read. This means that forward references will resolve to
1078 // something and when we reread the type later, we can replace the opaque type
1079 // with a new resolved concrete type.
1081 void BytecodeReader::ParseTypes(TypeListTy &Tab, unsigned NumEntries){
1082 assert(Tab.size() == 0 && "should not have read type constants in before!");
1084 // Insert a bunch of opaque types to be resolved later...
1085 Tab.reserve(NumEntries);
1086 for (unsigned i = 0; i != NumEntries; ++i)
1087 Tab.push_back(OpaqueType::get());
1090 Handler->handleTypeList(NumEntries);
1092 // If we are about to resolve types, make sure the type cache is clear.
1094 ModuleTypeIDCache.clear();
1096 // Loop through reading all of the types. Forward types will make use of the
1097 // opaque types just inserted.
1099 for (unsigned i = 0; i != NumEntries; ++i) {
1100 const Type* NewTy = ParseType();
1101 const Type* OldTy = Tab[i].get();
1103 error("Couldn't parse type!");
1105 // Don't directly push the new type on the Tab. Instead we want to replace
1106 // the opaque type we previously inserted with the new concrete value. This
1107 // approach helps with forward references to types. The refinement from the
1108 // abstract (opaque) type to the new type causes all uses of the abstract
1109 // type to use the concrete type (NewTy). This will also cause the opaque
1110 // type to be deleted.
1111 cast<DerivedType>(const_cast<Type*>(OldTy))->refineAbstractTypeTo(NewTy);
1113 // This should have replaced the old opaque type with the new type in the
1114 // value table... or with a preexisting type that was already in the system.
1115 // Let's just make sure it did.
1116 assert(Tab[i] != OldTy && "refineAbstractType didn't work!");
1120 /// Parse a single constant value
1121 Value *BytecodeReader::ParseConstantPoolValue(unsigned TypeID) {
1122 // We must check for a ConstantExpr before switching by type because
1123 // a ConstantExpr can be of any type, and has no explicit value.
1125 // 0 if not expr; numArgs if is expr
1126 unsigned isExprNumArgs = read_vbr_uint();
1128 if (isExprNumArgs) {
1129 // 'undef' is encoded with 'exprnumargs' == 1.
1130 if (isExprNumArgs == 1)
1131 return UndefValue::get(getType(TypeID));
1133 // Inline asm is encoded with exprnumargs == ~0U.
1134 if (isExprNumArgs == ~0U) {
1135 std::string AsmStr = read_str();
1136 std::string ConstraintStr = read_str();
1137 unsigned Flags = read_vbr_uint();
1139 const PointerType *PTy = dyn_cast<PointerType>(getType(TypeID));
1140 const FunctionType *FTy =
1141 PTy ? dyn_cast<FunctionType>(PTy->getElementType()) : 0;
1143 if (!FTy || !InlineAsm::Verify(FTy, ConstraintStr))
1144 error("Invalid constraints for inline asm");
1146 error("Invalid flags for inline asm");
1147 bool HasSideEffects = Flags & 1;
1148 return InlineAsm::get(FTy, AsmStr, ConstraintStr, HasSideEffects);
1153 // FIXME: Encoding of constant exprs could be much more compact!
1154 std::vector<Constant*> ArgVec;
1155 ArgVec.reserve(isExprNumArgs);
1156 unsigned Opcode = read_vbr_uint();
1158 // Read the slot number and types of each of the arguments
1159 for (unsigned i = 0; i != isExprNumArgs; ++i) {
1160 unsigned ArgValSlot = read_vbr_uint();
1161 unsigned ArgTypeSlot = read_vbr_uint();
1163 // Get the arg value from its slot if it exists, otherwise a placeholder
1164 ArgVec.push_back(getConstantValue(ArgTypeSlot, ArgValSlot));
1167 // Construct a ConstantExpr of the appropriate kind
1168 if (isExprNumArgs == 1) { // All one-operand expressions
1169 if (!Instruction::isCast(Opcode))
1170 error("Only cast instruction has one argument for ConstantExpr");
1172 Constant *Result = ConstantExpr::getCast(Opcode, ArgVec[0],
1174 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1176 } else if (Opcode == Instruction::GetElementPtr) { // GetElementPtr
1177 Constant *Result = ConstantExpr::getGetElementPtr(ArgVec[0], &ArgVec[1],
1179 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1181 } else if (Opcode == Instruction::Select) {
1182 if (ArgVec.size() != 3)
1183 error("Select instruction must have three arguments.");
1184 Constant* Result = ConstantExpr::getSelect(ArgVec[0], ArgVec[1],
1186 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1188 } else if (Opcode == Instruction::ExtractElement) {
1189 if (ArgVec.size() != 2 ||
1190 !ExtractElementInst::isValidOperands(ArgVec[0], ArgVec[1]))
1191 error("Invalid extractelement constand expr arguments");
1192 Constant* Result = ConstantExpr::getExtractElement(ArgVec[0], ArgVec[1]);
1193 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1195 } else if (Opcode == Instruction::InsertElement) {
1196 if (ArgVec.size() != 3 ||
1197 !InsertElementInst::isValidOperands(ArgVec[0], ArgVec[1], ArgVec[2]))
1198 error("Invalid insertelement constand expr arguments");
1201 ConstantExpr::getInsertElement(ArgVec[0], ArgVec[1], ArgVec[2]);
1202 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1204 } else if (Opcode == Instruction::ShuffleVector) {
1205 if (ArgVec.size() != 3 ||
1206 !ShuffleVectorInst::isValidOperands(ArgVec[0], ArgVec[1], ArgVec[2]))
1207 error("Invalid shufflevector constant expr arguments.");
1209 ConstantExpr::getShuffleVector(ArgVec[0], ArgVec[1], ArgVec[2]);
1210 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1212 } else if (Opcode == Instruction::ICmp) {
1213 if (ArgVec.size() != 2)
1214 error("Invalid ICmp constant expr arguments.");
1215 unsigned predicate = read_vbr_uint();
1216 Constant *Result = ConstantExpr::getICmp(predicate, ArgVec[0], ArgVec[1]);
1217 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1219 } else if (Opcode == Instruction::FCmp) {
1220 if (ArgVec.size() != 2)
1221 error("Invalid FCmp constant expr arguments.");
1222 unsigned predicate = read_vbr_uint();
1223 Constant *Result = ConstantExpr::getFCmp(predicate, ArgVec[0], ArgVec[1]);
1224 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1226 } else { // All other 2-operand expressions
1227 Constant* Result = ConstantExpr::get(Opcode, ArgVec[0], ArgVec[1]);
1228 if (Handler) Handler->handleConstantExpression(Opcode, ArgVec, Result);
1233 // Ok, not an ConstantExpr. We now know how to read the given type...
1234 const Type *Ty = getType(TypeID);
1235 Constant *Result = 0;
1236 switch (Ty->getTypeID()) {
1237 case Type::IntegerTyID: {
1238 const IntegerType *IT = cast<IntegerType>(Ty);
1239 if (IT->getBitWidth() <= 32) {
1240 uint32_t Val = read_vbr_uint();
1241 if (!ConstantInt::isValueValidForType(Ty, uint64_t(Val)))
1242 error("Integer value read is invalid for type.");
1243 Result = ConstantInt::get(IT, Val);
1244 if (Handler) Handler->handleConstantValue(Result);
1245 } else if (IT->getBitWidth() <= 64) {
1246 uint64_t Val = read_vbr_uint64();
1247 if (!ConstantInt::isValueValidForType(Ty, Val))
1248 error("Invalid constant integer read.");
1249 Result = ConstantInt::get(IT, Val);
1250 if (Handler) Handler->handleConstantValue(Result);
1252 assert("Integer types > 64 bits not supported");
1255 case Type::FloatTyID: {
1258 Result = ConstantFP::get(Ty, Val);
1259 if (Handler) Handler->handleConstantValue(Result);
1263 case Type::DoubleTyID: {
1266 Result = ConstantFP::get(Ty, Val);
1267 if (Handler) Handler->handleConstantValue(Result);
1271 case Type::ArrayTyID: {
1272 const ArrayType *AT = cast<ArrayType>(Ty);
1273 unsigned NumElements = AT->getNumElements();
1274 unsigned TypeSlot = getTypeSlot(AT->getElementType());
1275 std::vector<Constant*> Elements;
1276 Elements.reserve(NumElements);
1277 while (NumElements--) // Read all of the elements of the constant.
1278 Elements.push_back(getConstantValue(TypeSlot,
1280 Result = ConstantArray::get(AT, Elements);
1281 if (Handler) Handler->handleConstantArray(AT, Elements, TypeSlot, Result);
1285 case Type::StructTyID: {
1286 const StructType *ST = cast<StructType>(Ty);
1288 std::vector<Constant *> Elements;
1289 Elements.reserve(ST->getNumElements());
1290 for (unsigned i = 0; i != ST->getNumElements(); ++i)
1291 Elements.push_back(getConstantValue(ST->getElementType(i),
1294 Result = ConstantStruct::get(ST, Elements);
1295 if (Handler) Handler->handleConstantStruct(ST, Elements, Result);
1299 case Type::PackedTyID: {
1300 const PackedType *PT = cast<PackedType>(Ty);
1301 unsigned NumElements = PT->getNumElements();
1302 unsigned TypeSlot = getTypeSlot(PT->getElementType());
1303 std::vector<Constant*> Elements;
1304 Elements.reserve(NumElements);
1305 while (NumElements--) // Read all of the elements of the constant.
1306 Elements.push_back(getConstantValue(TypeSlot,
1308 Result = ConstantPacked::get(PT, Elements);
1309 if (Handler) Handler->handleConstantPacked(PT, Elements, TypeSlot, Result);
1313 case Type::PointerTyID: { // ConstantPointerRef value (backwards compat).
1314 const PointerType *PT = cast<PointerType>(Ty);
1315 unsigned Slot = read_vbr_uint();
1317 // Check to see if we have already read this global variable...
1318 Value *Val = getValue(TypeID, Slot, false);
1320 GlobalValue *GV = dyn_cast<GlobalValue>(Val);
1321 if (!GV) error("GlobalValue not in ValueTable!");
1322 if (Handler) Handler->handleConstantPointer(PT, Slot, GV);
1325 error("Forward references are not allowed here.");
1330 error("Don't know how to deserialize constant value of type '" +
1331 Ty->getDescription());
1335 // Check that we didn't read a null constant if they are implicit for this
1336 // type plane. Do not do this check for constantexprs, as they may be folded
1337 // to a null value in a way that isn't predicted when a .bc file is initially
1339 assert((!isa<Constant>(Result) || !cast<Constant>(Result)->isNullValue()) ||
1340 !hasImplicitNull(TypeID) &&
1341 "Cannot read null values from bytecode!");
1345 /// Resolve references for constants. This function resolves the forward
1346 /// referenced constants in the ConstantFwdRefs map. It uses the
1347 /// replaceAllUsesWith method of Value class to substitute the placeholder
1348 /// instance with the actual instance.
1349 void BytecodeReader::ResolveReferencesToConstant(Constant *NewV, unsigned Typ,
1351 ConstantRefsType::iterator I =
1352 ConstantFwdRefs.find(std::make_pair(Typ, Slot));
1353 if (I == ConstantFwdRefs.end()) return; // Never forward referenced?
1355 Value *PH = I->second; // Get the placeholder...
1356 PH->replaceAllUsesWith(NewV);
1357 delete PH; // Delete the old placeholder
1358 ConstantFwdRefs.erase(I); // Remove the map entry for it
1361 /// Parse the constant strings section.
1362 void BytecodeReader::ParseStringConstants(unsigned NumEntries, ValueTable &Tab){
1363 for (; NumEntries; --NumEntries) {
1364 unsigned Typ = read_vbr_uint();
1365 const Type *Ty = getType(Typ);
1366 if (!isa<ArrayType>(Ty))
1367 error("String constant data invalid!");
1369 const ArrayType *ATy = cast<ArrayType>(Ty);
1370 if (ATy->getElementType() != Type::Int8Ty &&
1371 ATy->getElementType() != Type::Int8Ty)
1372 error("String constant data invalid!");
1374 // Read character data. The type tells us how long the string is.
1375 char *Data = reinterpret_cast<char *>(alloca(ATy->getNumElements()));
1376 read_data(Data, Data+ATy->getNumElements());
1378 std::vector<Constant*> Elements(ATy->getNumElements());
1379 const Type* ElemType = ATy->getElementType();
1380 for (unsigned i = 0, e = ATy->getNumElements(); i != e; ++i)
1381 Elements[i] = ConstantInt::get(ElemType, (unsigned char)Data[i]);
1383 // Create the constant, inserting it as needed.
1384 Constant *C = ConstantArray::get(ATy, Elements);
1385 unsigned Slot = insertValue(C, Typ, Tab);
1386 ResolveReferencesToConstant(C, Typ, Slot);
1387 if (Handler) Handler->handleConstantString(cast<ConstantArray>(C));
1391 /// Parse the constant pool.
1392 void BytecodeReader::ParseConstantPool(ValueTable &Tab,
1393 TypeListTy &TypeTab,
1395 if (Handler) Handler->handleGlobalConstantsBegin();
1397 /// In LLVM 1.3 Type does not derive from Value so the types
1398 /// do not occupy a plane. Consequently, we read the types
1399 /// first in the constant pool.
1401 unsigned NumEntries = read_vbr_uint();
1402 ParseTypes(TypeTab, NumEntries);
1405 while (moreInBlock()) {
1406 unsigned NumEntries = read_vbr_uint();
1407 unsigned Typ = read_vbr_uint();
1409 if (Typ == Type::VoidTyID) {
1410 /// Use of Type::VoidTyID is a misnomer. It actually means
1411 /// that the following plane is constant strings
1412 assert(&Tab == &ModuleValues && "Cannot read strings in functions!");
1413 ParseStringConstants(NumEntries, Tab);
1415 for (unsigned i = 0; i < NumEntries; ++i) {
1416 Value *V = ParseConstantPoolValue(Typ);
1417 assert(V && "ParseConstantPoolValue returned NULL!");
1418 unsigned Slot = insertValue(V, Typ, Tab);
1420 // If we are reading a function constant table, make sure that we adjust
1421 // the slot number to be the real global constant number.
1423 if (&Tab != &ModuleValues && Typ < ModuleValues.size() &&
1425 Slot += ModuleValues[Typ]->size();
1426 if (Constant *C = dyn_cast<Constant>(V))
1427 ResolveReferencesToConstant(C, Typ, Slot);
1432 // After we have finished parsing the constant pool, we had better not have
1433 // any dangling references left.
1434 if (!ConstantFwdRefs.empty()) {
1435 ConstantRefsType::const_iterator I = ConstantFwdRefs.begin();
1436 Constant* missingConst = I->second;
1437 error(utostr(ConstantFwdRefs.size()) +
1438 " unresolved constant reference exist. First one is '" +
1439 missingConst->getName() + "' of type '" +
1440 missingConst->getType()->getDescription() + "'.");
1443 checkPastBlockEnd("Constant Pool");
1444 if (Handler) Handler->handleGlobalConstantsEnd();
1447 /// Parse the contents of a function. Note that this function can be
1448 /// called lazily by materializeFunction
1449 /// @see materializeFunction
1450 void BytecodeReader::ParseFunctionBody(Function* F) {
1452 unsigned FuncSize = BlockEnd - At;
1453 GlobalValue::LinkageTypes Linkage = GlobalValue::ExternalLinkage;
1454 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
1456 unsigned rWord = read_vbr_uint();
1457 unsigned LinkageID = rWord & 65535;
1458 unsigned VisibilityID = rWord >> 16;
1459 switch (LinkageID) {
1460 case 0: Linkage = GlobalValue::ExternalLinkage; break;
1461 case 1: Linkage = GlobalValue::WeakLinkage; break;
1462 case 2: Linkage = GlobalValue::AppendingLinkage; break;
1463 case 3: Linkage = GlobalValue::InternalLinkage; break;
1464 case 4: Linkage = GlobalValue::LinkOnceLinkage; break;
1465 case 5: Linkage = GlobalValue::DLLImportLinkage; break;
1466 case 6: Linkage = GlobalValue::DLLExportLinkage; break;
1467 case 7: Linkage = GlobalValue::ExternalWeakLinkage; break;
1469 error("Invalid linkage type for Function.");
1470 Linkage = GlobalValue::InternalLinkage;
1473 switch (VisibilityID) {
1474 case 0: Visibility = GlobalValue::DefaultVisibility; break;
1475 case 1: Visibility = GlobalValue::HiddenVisibility; break;
1477 error("Unknown visibility type: " + utostr(VisibilityID));
1478 Visibility = GlobalValue::DefaultVisibility;
1482 F->setLinkage(Linkage);
1483 F->setVisibility(Visibility);
1484 if (Handler) Handler->handleFunctionBegin(F,FuncSize);
1486 // Keep track of how many basic blocks we have read in...
1487 unsigned BlockNum = 0;
1488 bool InsertedArguments = false;
1490 BufPtr MyEnd = BlockEnd;
1491 while (At < MyEnd) {
1492 unsigned Type, Size;
1494 read_block(Type, Size);
1497 case BytecodeFormat::ConstantPoolBlockID:
1498 if (!InsertedArguments) {
1499 // Insert arguments into the value table before we parse the first basic
1500 // block in the function
1502 InsertedArguments = true;
1505 ParseConstantPool(FunctionValues, FunctionTypes, true);
1508 case BytecodeFormat::InstructionListBlockID: {
1509 // Insert arguments into the value table before we parse the instruction
1510 // list for the function
1511 if (!InsertedArguments) {
1513 InsertedArguments = true;
1517 error("Already parsed basic blocks!");
1518 BlockNum = ParseInstructionList(F);
1522 case BytecodeFormat::ValueSymbolTableBlockID:
1523 ParseValueSymbolTable(F, &F->getValueSymbolTable());
1526 case BytecodeFormat::TypeSymbolTableBlockID:
1527 error("Functions don't have type symbol tables");
1533 error("Wrapped around reading bytecode.");
1539 // Make sure there were no references to non-existant basic blocks.
1540 if (BlockNum != ParsedBasicBlocks.size())
1541 error("Illegal basic block operand reference");
1543 ParsedBasicBlocks.clear();
1545 // Resolve forward references. Replace any uses of a forward reference value
1546 // with the real value.
1547 while (!ForwardReferences.empty()) {
1548 std::map<std::pair<unsigned,unsigned>, Value*>::iterator
1549 I = ForwardReferences.begin();
1550 Value *V = getValue(I->first.first, I->first.second, false);
1551 Value *PlaceHolder = I->second;
1552 PlaceHolder->replaceAllUsesWith(V);
1553 ForwardReferences.erase(I);
1557 // Clear out function-level types...
1558 FunctionTypes.clear();
1559 freeTable(FunctionValues);
1561 if (Handler) Handler->handleFunctionEnd(F);
1564 /// This function parses LLVM functions lazily. It obtains the type of the
1565 /// function and records where the body of the function is in the bytecode
1566 /// buffer. The caller can then use the ParseNextFunction and
1567 /// ParseAllFunctionBodies to get handler events for the functions.
1568 void BytecodeReader::ParseFunctionLazily() {
1569 if (FunctionSignatureList.empty())
1570 error("FunctionSignatureList empty!");
1572 Function *Func = FunctionSignatureList.back();
1573 FunctionSignatureList.pop_back();
1575 // Save the information for future reading of the function
1576 LazyFunctionLoadMap[Func] = LazyFunctionInfo(BlockStart, BlockEnd);
1578 // This function has a body but it's not loaded so it appears `External'.
1579 // Mark it as a `Ghost' instead to notify the users that it has a body.
1580 Func->setLinkage(GlobalValue::GhostLinkage);
1582 // Pretend we've `parsed' this function
1586 /// The ParserFunction method lazily parses one function. Use this method to
1587 /// casue the parser to parse a specific function in the module. Note that
1588 /// this will remove the function from what is to be included by
1589 /// ParseAllFunctionBodies.
1590 /// @see ParseAllFunctionBodies
1591 /// @see ParseBytecode
1592 bool BytecodeReader::ParseFunction(Function* Func, std::string* ErrMsg) {
1594 if (setjmp(context)) {
1595 // Set caller's error message, if requested
1598 // Indicate an error occurred
1602 // Find {start, end} pointers and slot in the map. If not there, we're done.
1603 LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.find(Func);
1605 // Make sure we found it
1606 if (Fi == LazyFunctionLoadMap.end()) {
1607 error("Unrecognized function of type " + Func->getType()->getDescription());
1611 BlockStart = At = Fi->second.Buf;
1612 BlockEnd = Fi->second.EndBuf;
1613 assert(Fi->first == Func && "Found wrong function?");
1615 LazyFunctionLoadMap.erase(Fi);
1617 this->ParseFunctionBody(Func);
1621 /// The ParseAllFunctionBodies method parses through all the previously
1622 /// unparsed functions in the bytecode file. If you want to completely parse
1623 /// a bytecode file, this method should be called after Parsebytecode because
1624 /// Parsebytecode only records the locations in the bytecode file of where
1625 /// the function definitions are located. This function uses that information
1626 /// to materialize the functions.
1627 /// @see ParseBytecode
1628 bool BytecodeReader::ParseAllFunctionBodies(std::string* ErrMsg) {
1629 if (setjmp(context)) {
1630 // Set caller's error message, if requested
1633 // Indicate an error occurred
1637 LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.begin();
1638 LazyFunctionMap::iterator Fe = LazyFunctionLoadMap.end();
1641 Function* Func = Fi->first;
1642 BlockStart = At = Fi->second.Buf;
1643 BlockEnd = Fi->second.EndBuf;
1644 ParseFunctionBody(Func);
1647 LazyFunctionLoadMap.clear();
1651 /// Parse the global type list
1652 void BytecodeReader::ParseGlobalTypes() {
1653 // Read the number of types
1654 unsigned NumEntries = read_vbr_uint();
1655 ParseTypes(ModuleTypes, NumEntries);
1658 /// Parse the Global info (types, global vars, constants)
1659 void BytecodeReader::ParseModuleGlobalInfo() {
1661 if (Handler) Handler->handleModuleGlobalsBegin();
1663 // SectionID - If a global has an explicit section specified, this map
1664 // remembers the ID until we can translate it into a string.
1665 std::map<GlobalValue*, unsigned> SectionID;
1667 // Read global variables...
1668 unsigned VarType = read_vbr_uint();
1669 while (VarType != Type::VoidTyID) { // List is terminated by Void
1670 // VarType Fields: bit0 = isConstant, bit1 = hasInitializer, bit2,3,4 =
1671 // Linkage, bit4+ = slot#
1672 unsigned SlotNo = VarType >> 5;
1673 unsigned LinkageID = (VarType >> 2) & 7;
1674 unsigned VisibilityID = 0;
1675 bool isConstant = VarType & 1;
1676 bool hasInitializer = (VarType & 2) != 0;
1677 unsigned Alignment = 0;
1678 unsigned GlobalSectionID = 0;
1680 // An extension word is present when linkage = 3 (internal) and hasinit = 0.
1681 if (LinkageID == 3 && !hasInitializer) {
1682 unsigned ExtWord = read_vbr_uint();
1683 // The extension word has this format: bit 0 = has initializer, bit 1-3 =
1684 // linkage, bit 4-8 = alignment (log2), bit 9 = has section,
1685 // bits 10-12 = visibility, bits 13+ = future use.
1686 hasInitializer = ExtWord & 1;
1687 LinkageID = (ExtWord >> 1) & 7;
1688 Alignment = (1 << ((ExtWord >> 4) & 31)) >> 1;
1689 VisibilityID = (ExtWord >> 10) & 7;
1691 if (ExtWord & (1 << 9)) // Has a section ID.
1692 GlobalSectionID = read_vbr_uint();
1695 GlobalValue::LinkageTypes Linkage;
1696 switch (LinkageID) {
1697 case 0: Linkage = GlobalValue::ExternalLinkage; break;
1698 case 1: Linkage = GlobalValue::WeakLinkage; break;
1699 case 2: Linkage = GlobalValue::AppendingLinkage; break;
1700 case 3: Linkage = GlobalValue::InternalLinkage; break;
1701 case 4: Linkage = GlobalValue::LinkOnceLinkage; break;
1702 case 5: Linkage = GlobalValue::DLLImportLinkage; break;
1703 case 6: Linkage = GlobalValue::DLLExportLinkage; break;
1704 case 7: Linkage = GlobalValue::ExternalWeakLinkage; break;
1706 error("Unknown linkage type: " + utostr(LinkageID));
1707 Linkage = GlobalValue::InternalLinkage;
1710 GlobalValue::VisibilityTypes Visibility;
1711 switch (VisibilityID) {
1712 case 0: Visibility = GlobalValue::DefaultVisibility; break;
1713 case 1: Visibility = GlobalValue::HiddenVisibility; break;
1715 error("Unknown visibility type: " + utostr(VisibilityID));
1716 Visibility = GlobalValue::DefaultVisibility;
1720 const Type *Ty = getType(SlotNo);
1722 error("Global has no type! SlotNo=" + utostr(SlotNo));
1724 if (!isa<PointerType>(Ty))
1725 error("Global not a pointer type! Ty= " + Ty->getDescription());
1727 const Type *ElTy = cast<PointerType>(Ty)->getElementType();
1729 // Create the global variable...
1730 GlobalVariable *GV = new GlobalVariable(ElTy, isConstant, Linkage,
1732 GV->setAlignment(Alignment);
1733 GV->setVisibility(Visibility);
1734 insertValue(GV, SlotNo, ModuleValues);
1736 if (GlobalSectionID != 0)
1737 SectionID[GV] = GlobalSectionID;
1739 unsigned initSlot = 0;
1740 if (hasInitializer) {
1741 initSlot = read_vbr_uint();
1742 GlobalInits.push_back(std::make_pair(GV, initSlot));
1745 // Notify handler about the global value.
1747 Handler->handleGlobalVariable(ElTy, isConstant, Linkage, Visibility,
1751 VarType = read_vbr_uint();
1754 // Read the function objects for all of the functions that are coming
1755 unsigned FnSignature = read_vbr_uint();
1757 // List is terminated by VoidTy.
1758 while (((FnSignature & (~0U >> 1)) >> 5) != Type::VoidTyID) {
1759 const Type *Ty = getType((FnSignature & (~0U >> 1)) >> 5);
1760 if (!isa<PointerType>(Ty) ||
1761 !isa<FunctionType>(cast<PointerType>(Ty)->getElementType())) {
1762 error("Function not a pointer to function type! Ty = " +
1763 Ty->getDescription());
1766 // We create functions by passing the underlying FunctionType to create...
1767 const FunctionType* FTy =
1768 cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
1770 // Insert the place holder.
1771 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage,
1774 insertValue(Func, (FnSignature & (~0U >> 1)) >> 5, ModuleValues);
1776 // Flags are not used yet.
1777 unsigned Flags = FnSignature & 31;
1779 // Save this for later so we know type of lazily instantiated functions.
1780 // Note that known-external functions do not have FunctionInfo blocks, so we
1781 // do not add them to the FunctionSignatureList.
1782 if ((Flags & (1 << 4)) == 0)
1783 FunctionSignatureList.push_back(Func);
1785 // Get the calling convention from the low bits.
1786 unsigned CC = Flags & 15;
1787 unsigned Alignment = 0;
1788 if (FnSignature & (1 << 31)) { // Has extension word?
1789 unsigned ExtWord = read_vbr_uint();
1790 Alignment = (1 << (ExtWord & 31)) >> 1;
1791 CC |= ((ExtWord >> 5) & 15) << 4;
1793 if (ExtWord & (1 << 10)) // Has a section ID.
1794 SectionID[Func] = read_vbr_uint();
1796 // Parse external declaration linkage
1797 switch ((ExtWord >> 11) & 3) {
1799 case 1: Func->setLinkage(Function::DLLImportLinkage); break;
1800 case 2: Func->setLinkage(Function::ExternalWeakLinkage); break;
1801 default: assert(0 && "Unsupported external linkage");
1805 Func->setCallingConv(CC-1);
1806 Func->setAlignment(Alignment);
1808 if (Handler) Handler->handleFunctionDeclaration(Func);
1810 // Get the next function signature.
1811 FnSignature = read_vbr_uint();
1814 // Now that the function signature list is set up, reverse it so that we can
1815 // remove elements efficiently from the back of the vector.
1816 std::reverse(FunctionSignatureList.begin(), FunctionSignatureList.end());
1818 /// SectionNames - This contains the list of section names encoded in the
1819 /// moduleinfoblock. Functions and globals with an explicit section index
1820 /// into this to get their section name.
1821 std::vector<std::string> SectionNames;
1823 // Read in the dependent library information.
1824 unsigned num_dep_libs = read_vbr_uint();
1825 std::string dep_lib;
1826 while (num_dep_libs--) {
1827 dep_lib = read_str();
1828 TheModule->addLibrary(dep_lib);
1830 Handler->handleDependentLibrary(dep_lib);
1833 // Read target triple and place into the module.
1834 std::string triple = read_str();
1835 TheModule->setTargetTriple(triple);
1837 Handler->handleTargetTriple(triple);
1839 // Read the data layout string and place into the module.
1840 std::string datalayout = read_str();
1841 TheModule->setDataLayout(datalayout);
1844 // Handler->handleDataLayout(datalayout);
1846 if (At != BlockEnd) {
1847 // If the file has section info in it, read the section names now.
1848 unsigned NumSections = read_vbr_uint();
1849 while (NumSections--)
1850 SectionNames.push_back(read_str());
1853 // If the file has module-level inline asm, read it now.
1855 TheModule->setModuleInlineAsm(read_str());
1857 // If any globals are in specified sections, assign them now.
1858 for (std::map<GlobalValue*, unsigned>::iterator I = SectionID.begin(), E =
1859 SectionID.end(); I != E; ++I)
1861 if (I->second > SectionID.size())
1862 error("SectionID out of range for global!");
1863 I->first->setSection(SectionNames[I->second-1]);
1866 // This is for future proofing... in the future extra fields may be added that
1867 // we don't understand, so we transparently ignore them.
1871 if (Handler) Handler->handleModuleGlobalsEnd();
1874 /// Parse the version information and decode it by setting flags on the
1875 /// Reader that enable backward compatibility of the reader.
1876 void BytecodeReader::ParseVersionInfo() {
1877 unsigned RevisionNum = read_vbr_uint();
1879 // We don't provide backwards compatibility in the Reader any more. To
1880 // upgrade, the user should use llvm-upgrade.
1881 if (RevisionNum < 7)
1882 error("Bytecode formats < 7 are no longer supported. Use llvm-upgrade.");
1884 if (Handler) Handler->handleVersionInfo(RevisionNum);
1887 /// Parse a whole module.
1888 void BytecodeReader::ParseModule() {
1889 unsigned Type, Size;
1891 FunctionSignatureList.clear(); // Just in case...
1893 // Read into instance variables...
1896 bool SeenModuleGlobalInfo = false;
1897 bool SeenGlobalTypePlane = false;
1898 BufPtr MyEnd = BlockEnd;
1899 while (At < MyEnd) {
1901 read_block(Type, Size);
1905 case BytecodeFormat::GlobalTypePlaneBlockID:
1906 if (SeenGlobalTypePlane)
1907 error("Two GlobalTypePlane Blocks Encountered!");
1911 SeenGlobalTypePlane = true;
1914 case BytecodeFormat::ModuleGlobalInfoBlockID:
1915 if (SeenModuleGlobalInfo)
1916 error("Two ModuleGlobalInfo Blocks Encountered!");
1917 ParseModuleGlobalInfo();
1918 SeenModuleGlobalInfo = true;
1921 case BytecodeFormat::ConstantPoolBlockID:
1922 ParseConstantPool(ModuleValues, ModuleTypes,false);
1925 case BytecodeFormat::FunctionBlockID:
1926 ParseFunctionLazily();
1929 case BytecodeFormat::ValueSymbolTableBlockID:
1930 ParseValueSymbolTable(0, &TheModule->getValueSymbolTable());
1933 case BytecodeFormat::TypeSymbolTableBlockID:
1934 ParseTypeSymbolTable(&TheModule->getTypeSymbolTable());
1940 error("Unexpected Block of Type #" + utostr(Type) + " encountered!");
1947 // After the module constant pool has been read, we can safely initialize
1948 // global variables...
1949 while (!GlobalInits.empty()) {
1950 GlobalVariable *GV = GlobalInits.back().first;
1951 unsigned Slot = GlobalInits.back().second;
1952 GlobalInits.pop_back();
1954 // Look up the initializer value...
1955 // FIXME: Preserve this type ID!
1957 const llvm::PointerType* GVType = GV->getType();
1958 unsigned TypeSlot = getTypeSlot(GVType->getElementType());
1959 if (Constant *CV = getConstantValue(TypeSlot, Slot)) {
1960 if (GV->hasInitializer())
1961 error("Global *already* has an initializer?!");
1962 if (Handler) Handler->handleGlobalInitializer(GV,CV);
1963 GV->setInitializer(CV);
1965 error("Cannot find initializer value.");
1968 if (!ConstantFwdRefs.empty())
1969 error("Use of undefined constants in a module");
1971 /// Make sure we pulled them all out. If we didn't then there's a declaration
1972 /// but a missing body. That's not allowed.
1973 if (!FunctionSignatureList.empty())
1974 error("Function declared, but bytecode stream ended before definition");
1977 /// This function completely parses a bytecode buffer given by the \p Buf
1978 /// and \p Length parameters.
1979 bool BytecodeReader::ParseBytecode(volatile BufPtr Buf, unsigned Length,
1980 const std::string &ModuleID,
1981 std::string* ErrMsg) {
1983 /// We handle errors by
1984 if (setjmp(context)) {
1985 // Cleanup after error
1986 if (Handler) Handler->handleError(ErrorMsg);
1990 if (decompressedBlock != 0 ) {
1991 ::free(decompressedBlock);
1992 decompressedBlock = 0;
1994 // Set caller's error message, if requested
1997 // Indicate an error occurred
2002 At = MemStart = BlockStart = Buf;
2003 MemEnd = BlockEnd = Buf + Length;
2005 // Create the module
2006 TheModule = new Module(ModuleID);
2008 if (Handler) Handler->handleStart(TheModule, Length);
2010 // Read the four bytes of the signature.
2011 unsigned Sig = read_uint();
2013 // If this is a compressed file
2014 if (Sig == ('l' | ('l' << 8) | ('v' << 16) | ('c' << 24))) {
2016 // Invoke the decompression of the bytecode. Note that we have to skip the
2017 // file's magic number which is not part of the compressed block. Hence,
2018 // the Buf+4 and Length-4. The result goes into decompressedBlock, a data
2019 // member for retention until BytecodeReader is destructed.
2020 unsigned decompressedLength = Compressor::decompressToNewBuffer(
2021 (char*)Buf+4,Length-4,decompressedBlock);
2023 // We must adjust the buffer pointers used by the bytecode reader to point
2024 // into the new decompressed block. After decompression, the
2025 // decompressedBlock will point to a contiguous memory area that has
2026 // the decompressed data.
2027 At = MemStart = BlockStart = Buf = (BufPtr) decompressedBlock;
2028 MemEnd = BlockEnd = Buf + decompressedLength;
2030 // else if this isn't a regular (uncompressed) bytecode file, then its
2031 // and error, generate that now.
2032 } else if (Sig != ('l' | ('l' << 8) | ('v' << 16) | ('m' << 24))) {
2033 error("Invalid bytecode signature: " + utohexstr(Sig));
2036 // Tell the handler we're starting a module
2037 if (Handler) Handler->handleModuleBegin(ModuleID);
2039 // Get the module block and size and verify. This is handled specially
2040 // because the module block/size is always written in long format. Other
2041 // blocks are written in short format so the read_block method is used.
2042 unsigned Type, Size;
2045 if (Type != BytecodeFormat::ModuleBlockID) {
2046 error("Expected Module Block! Type:" + utostr(Type) + ", Size:"
2050 // It looks like the darwin ranlib program is broken, and adds trailing
2051 // garbage to the end of some bytecode files. This hack allows the bc
2052 // reader to ignore trailing garbage on bytecode files.
2053 if (At + Size < MemEnd)
2054 MemEnd = BlockEnd = At+Size;
2056 if (At + Size != MemEnd)
2057 error("Invalid Top Level Block Length! Type:" + utostr(Type)
2058 + ", Size:" + utostr(Size));
2060 // Parse the module contents
2061 this->ParseModule();
2063 // Check for missing functions
2065 error("Function expected, but bytecode stream ended!");
2067 // Tell the handler we're done with the module
2069 Handler->handleModuleEnd(ModuleID);
2071 // Tell the handler we're finished the parse
2072 if (Handler) Handler->handleFinish();
2078 //===----------------------------------------------------------------------===//
2079 //=== Default Implementations of Handler Methods
2080 //===----------------------------------------------------------------------===//
2082 BytecodeHandler::~BytecodeHandler() {}