Bug Summary

File:lib/Bitcode/Reader/BitcodeReader.cpp
Location:line 4336, column 9
Description:Value stored to 'Ty' is never read

Annotated Source Code

1//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "llvm/Bitcode/ReaderWriter.h"
11#include "llvm/ADT/STLExtras.h"
12#include "llvm/ADT/SmallString.h"
13#include "llvm/ADT/SmallVector.h"
14#include "llvm/ADT/Triple.h"
15#include "llvm/Bitcode/BitstreamReader.h"
16#include "llvm/Bitcode/LLVMBitCodes.h"
17#include "llvm/IR/AutoUpgrade.h"
18#include "llvm/IR/Constants.h"
19#include "llvm/IR/DebugInfo.h"
20#include "llvm/IR/DebugInfoMetadata.h"
21#include "llvm/IR/DerivedTypes.h"
22#include "llvm/IR/DiagnosticPrinter.h"
23#include "llvm/IR/GVMaterializer.h"
24#include "llvm/IR/InlineAsm.h"
25#include "llvm/IR/IntrinsicInst.h"
26#include "llvm/IR/LLVMContext.h"
27#include "llvm/IR/Module.h"
28#include "llvm/IR/OperandTraits.h"
29#include "llvm/IR/Operator.h"
30#include "llvm/IR/ValueHandle.h"
31#include "llvm/Support/DataStream.h"
32#include "llvm/Support/ManagedStatic.h"
33#include "llvm/Support/MathExtras.h"
34#include "llvm/Support/MemoryBuffer.h"
35#include "llvm/Support/raw_ostream.h"
36#include <deque>
37using namespace llvm;
38
39namespace {
40enum {
41 SWITCH_INST_MAGIC = 0x4B5 // May 2012 => 1205 => Hex
42};
43
44/// Indicates which operator an operand allows (for the few operands that may
45/// only reference a certain operator).
46enum OperatorConstraint {
47 OC_None = 0, // No constraint
48 OC_CatchPad, // Must be CatchPadInst
49 OC_CleanupPad // Must be CleanupPadInst
50};
51
52class BitcodeReaderValueList {
53 std::vector<WeakVH> ValuePtrs;
54
55 /// As we resolve forward-referenced constants, we add information about them
56 /// to this vector. This allows us to resolve them in bulk instead of
57 /// resolving each reference at a time. See the code in
58 /// ResolveConstantForwardRefs for more information about this.
59 ///
60 /// The key of this vector is the placeholder constant, the value is the slot
61 /// number that holds the resolved value.
62 typedef std::vector<std::pair<Constant*, unsigned> > ResolveConstantsTy;
63 ResolveConstantsTy ResolveConstants;
64 LLVMContext &Context;
65public:
66 BitcodeReaderValueList(LLVMContext &C) : Context(C) {}
67 ~BitcodeReaderValueList() {
68 assert(ResolveConstants.empty() && "Constants not resolved?")((ResolveConstants.empty() && "Constants not resolved?"
) ? static_cast<void> (0) : __assert_fail ("ResolveConstants.empty() && \"Constants not resolved?\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 68, __PRETTY_FUNCTION__));
69 }
70
71 // vector compatibility methods
72 unsigned size() const { return ValuePtrs.size(); }
73 void resize(unsigned N) { ValuePtrs.resize(N); }
74 void push_back(Value *V) { ValuePtrs.emplace_back(V); }
75
76 void clear() {
77 assert(ResolveConstants.empty() && "Constants not resolved?")((ResolveConstants.empty() && "Constants not resolved?"
) ? static_cast<void> (0) : __assert_fail ("ResolveConstants.empty() && \"Constants not resolved?\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 77, __PRETTY_FUNCTION__));
78 ValuePtrs.clear();
79 }
80
81 Value *operator[](unsigned i) const {
82 assert(i < ValuePtrs.size())((i < ValuePtrs.size()) ? static_cast<void> (0) : __assert_fail
("i < ValuePtrs.size()", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 82, __PRETTY_FUNCTION__));
83 return ValuePtrs[i];
84 }
85
86 Value *back() const { return ValuePtrs.back(); }
87 void pop_back() { ValuePtrs.pop_back(); }
88 bool empty() const { return ValuePtrs.empty(); }
89 void shrinkTo(unsigned N) {
90 assert(N <= size() && "Invalid shrinkTo request!")((N <= size() && "Invalid shrinkTo request!") ? static_cast
<void> (0) : __assert_fail ("N <= size() && \"Invalid shrinkTo request!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 90, __PRETTY_FUNCTION__));
91 ValuePtrs.resize(N);
92 }
93
94 Constant *getConstantFwdRef(unsigned Idx, Type *Ty);
95 Value *getValueFwdRef(unsigned Idx, Type *Ty,
96 OperatorConstraint OC = OC_None);
97
98 bool assignValue(Value *V, unsigned Idx);
99
100 /// Once all constants are read, this method bulk resolves any forward
101 /// references.
102 void resolveConstantForwardRefs();
103};
104
105class BitcodeReaderMDValueList {
106 unsigned NumFwdRefs;
107 bool AnyFwdRefs;
108 unsigned MinFwdRef;
109 unsigned MaxFwdRef;
110 std::vector<TrackingMDRef> MDValuePtrs;
111
112 LLVMContext &Context;
113public:
114 BitcodeReaderMDValueList(LLVMContext &C)
115 : NumFwdRefs(0), AnyFwdRefs(false), Context(C) {}
116
117 // vector compatibility methods
118 unsigned size() const { return MDValuePtrs.size(); }
119 void resize(unsigned N) { MDValuePtrs.resize(N); }
120 void push_back(Metadata *MD) { MDValuePtrs.emplace_back(MD); }
121 void clear() { MDValuePtrs.clear(); }
122 Metadata *back() const { return MDValuePtrs.back(); }
123 void pop_back() { MDValuePtrs.pop_back(); }
124 bool empty() const { return MDValuePtrs.empty(); }
125
126 Metadata *operator[](unsigned i) const {
127 assert(i < MDValuePtrs.size())((i < MDValuePtrs.size()) ? static_cast<void> (0) : __assert_fail
("i < MDValuePtrs.size()", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 127, __PRETTY_FUNCTION__));
128 return MDValuePtrs[i];
129 }
130
131 void shrinkTo(unsigned N) {
132 assert(N <= size() && "Invalid shrinkTo request!")((N <= size() && "Invalid shrinkTo request!") ? static_cast
<void> (0) : __assert_fail ("N <= size() && \"Invalid shrinkTo request!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 132, __PRETTY_FUNCTION__));
133 MDValuePtrs.resize(N);
134 }
135
136 Metadata *getValueFwdRef(unsigned Idx);
137 void assignValue(Metadata *MD, unsigned Idx);
138 void tryToResolveCycles();
139};
140
141class BitcodeReader : public GVMaterializer {
142 LLVMContext &Context;
143 DiagnosticHandlerFunction DiagnosticHandler;
144 Module *TheModule = nullptr;
145 std::unique_ptr<MemoryBuffer> Buffer;
146 std::unique_ptr<BitstreamReader> StreamFile;
147 BitstreamCursor Stream;
148 uint64_t NextUnreadBit = 0;
149 bool SeenValueSymbolTable = false;
150
151 std::vector<Type*> TypeList;
152 BitcodeReaderValueList ValueList;
153 BitcodeReaderMDValueList MDValueList;
154 std::vector<Comdat *> ComdatList;
155 SmallVector<Instruction *, 64> InstructionList;
156
157 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
158 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
159 std::vector<std::pair<Function*, unsigned> > FunctionPrefixes;
160 std::vector<std::pair<Function*, unsigned> > FunctionPrologues;
161 std::vector<std::pair<Function*, unsigned> > FunctionPersonalityFns;
162
163 SmallVector<Instruction*, 64> InstsWithTBAATag;
164
165 /// The set of attributes by index. Index zero in the file is for null, and
166 /// is thus not represented here. As such all indices are off by one.
167 std::vector<AttributeSet> MAttributes;
168
169 /// \brief The set of attribute groups.
170 std::map<unsigned, AttributeSet> MAttributeGroups;
171
172 /// While parsing a function body, this is a list of the basic blocks for the
173 /// function.
174 std::vector<BasicBlock*> FunctionBBs;
175
176 // When reading the module header, this list is populated with functions that
177 // have bodies later in the file.
178 std::vector<Function*> FunctionsWithBodies;
179
180 // When intrinsic functions are encountered which require upgrading they are
181 // stored here with their replacement function.
182 typedef DenseMap<Function*, Function*> UpgradedIntrinsicMap;
183 UpgradedIntrinsicMap UpgradedIntrinsics;
184
185 // Map the bitcode's custom MDKind ID to the Module's MDKind ID.
186 DenseMap<unsigned, unsigned> MDKindMap;
187
188 // Several operations happen after the module header has been read, but
189 // before function bodies are processed. This keeps track of whether
190 // we've done this yet.
191 bool SeenFirstFunctionBody = false;
192
193 /// When function bodies are initially scanned, this map contains info about
194 /// where to find deferred function body in the stream.
195 DenseMap<Function*, uint64_t> DeferredFunctionInfo;
196
197 /// When Metadata block is initially scanned when parsing the module, we may
198 /// choose to defer parsing of the metadata. This vector contains info about
199 /// which Metadata blocks are deferred.
200 std::vector<uint64_t> DeferredMetadataInfo;
201
202 /// These are basic blocks forward-referenced by block addresses. They are
203 /// inserted lazily into functions when they're loaded. The basic block ID is
204 /// its index into the vector.
205 DenseMap<Function *, std::vector<BasicBlock *>> BasicBlockFwdRefs;
206 std::deque<Function *> BasicBlockFwdRefQueue;
207
208 /// Indicates that we are using a new encoding for instruction operands where
209 /// most operands in the current FUNCTION_BLOCK are encoded relative to the
210 /// instruction number, for a more compact encoding. Some instruction
211 /// operands are not relative to the instruction ID: basic block numbers, and
212 /// types. Once the old style function blocks have been phased out, we would
213 /// not need this flag.
214 bool UseRelativeIDs = false;
215
216 /// True if all functions will be materialized, negating the need to process
217 /// (e.g.) blockaddress forward references.
218 bool WillMaterializeAllForwardRefs = false;
219
220 /// Functions that have block addresses taken. This is usually empty.
221 SmallPtrSet<const Function *, 4> BlockAddressesTaken;
222
223 /// True if any Metadata block has been materialized.
224 bool IsMetadataMaterialized = false;
225
226 bool StripDebugInfo = false;
227
228public:
229 std::error_code error(BitcodeError E, const Twine &Message);
230 std::error_code error(BitcodeError E);
231 std::error_code error(const Twine &Message);
232
233 BitcodeReader(MemoryBuffer *Buffer, LLVMContext &Context,
234 DiagnosticHandlerFunction DiagnosticHandler);
235 BitcodeReader(LLVMContext &Context,
236 DiagnosticHandlerFunction DiagnosticHandler);
237 ~BitcodeReader() override { freeState(); }
238
239 std::error_code materializeForwardReferencedFunctions();
240
241 void freeState();
242
243 void releaseBuffer();
244
245 bool isDematerializable(const GlobalValue *GV) const override;
246 std::error_code materialize(GlobalValue *GV) override;
247 std::error_code materializeModule(Module *M) override;
248 std::vector<StructType *> getIdentifiedStructTypes() const override;
249 void dematerialize(GlobalValue *GV) override;
250
251 /// \brief Main interface to parsing a bitcode buffer.
252 /// \returns true if an error occurred.
253 std::error_code parseBitcodeInto(std::unique_ptr<DataStreamer> Streamer,
254 Module *M,
255 bool ShouldLazyLoadMetadata = false);
256
257 /// \brief Cheap mechanism to just extract module triple
258 /// \returns true if an error occurred.
259 ErrorOr<std::string> parseTriple();
260
261 static uint64_t decodeSignRotatedValue(uint64_t V);
262
263 /// Materialize any deferred Metadata block.
264 std::error_code materializeMetadata() override;
265
266 void setStripDebugInfo() override;
267
268private:
269 std::vector<StructType *> IdentifiedStructTypes;
270 StructType *createIdentifiedStructType(LLVMContext &Context, StringRef Name);
271 StructType *createIdentifiedStructType(LLVMContext &Context);
272
273 Type *getTypeByID(unsigned ID);
274 Value *getFnValueByID(unsigned ID, Type *Ty,
275 OperatorConstraint OC = OC_None) {
276 if (Ty && Ty->isMetadataTy())
277 return MetadataAsValue::get(Ty->getContext(), getFnMetadataByID(ID));
278 return ValueList.getValueFwdRef(ID, Ty, OC);
279 }
280 Metadata *getFnMetadataByID(unsigned ID) {
281 return MDValueList.getValueFwdRef(ID);
282 }
283 BasicBlock *getBasicBlock(unsigned ID) const {
284 if (ID >= FunctionBBs.size()) return nullptr; // Invalid ID
285 return FunctionBBs[ID];
286 }
287 AttributeSet getAttributes(unsigned i) const {
288 if (i-1 < MAttributes.size())
289 return MAttributes[i-1];
290 return AttributeSet();
291 }
292
293 /// Read a value/type pair out of the specified record from slot 'Slot'.
294 /// Increment Slot past the number of slots used in the record. Return true on
295 /// failure.
296 bool getValueTypePair(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
297 unsigned InstNum, Value *&ResVal) {
298 if (Slot == Record.size()) return true;
299 unsigned ValNo = (unsigned)Record[Slot++];
300 // Adjust the ValNo, if it was encoded relative to the InstNum.
301 if (UseRelativeIDs)
302 ValNo = InstNum - ValNo;
303 if (ValNo < InstNum) {
304 // If this is not a forward reference, just return the value we already
305 // have.
306 ResVal = getFnValueByID(ValNo, nullptr);
307 return ResVal == nullptr;
308 }
309 if (Slot == Record.size())
310 return true;
311
312 unsigned TypeNo = (unsigned)Record[Slot++];
313 ResVal = getFnValueByID(ValNo, getTypeByID(TypeNo));
314 return ResVal == nullptr;
315 }
316
317 /// Read a value out of the specified record from slot 'Slot'. Increment Slot
318 /// past the number of slots used by the value in the record. Return true if
319 /// there is an error.
320 bool popValue(SmallVectorImpl<uint64_t> &Record, unsigned &Slot,
321 unsigned InstNum, Type *Ty, Value *&ResVal,
322 OperatorConstraint OC = OC_None) {
323 if (getValue(Record, Slot, InstNum, Ty, ResVal, OC))
324 return true;
325 // All values currently take a single record slot.
326 ++Slot;
327 return false;
328 }
329
330 /// Like popValue, but does not increment the Slot number.
331 bool getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
332 unsigned InstNum, Type *Ty, Value *&ResVal,
333 OperatorConstraint OC = OC_None) {
334 ResVal = getValue(Record, Slot, InstNum, Ty, OC);
335 return ResVal == nullptr;
336 }
337
338 /// Version of getValue that returns ResVal directly, or 0 if there is an
339 /// error.
340 Value *getValue(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
341 unsigned InstNum, Type *Ty, OperatorConstraint OC = OC_None) {
342 if (Slot == Record.size()) return nullptr;
343 unsigned ValNo = (unsigned)Record[Slot];
344 // Adjust the ValNo, if it was encoded relative to the InstNum.
345 if (UseRelativeIDs)
346 ValNo = InstNum - ValNo;
347 return getFnValueByID(ValNo, Ty, OC);
348 }
349
350 /// Like getValue, but decodes signed VBRs.
351 Value *getValueSigned(SmallVectorImpl<uint64_t> &Record, unsigned Slot,
352 unsigned InstNum, Type *Ty,
353 OperatorConstraint OC = OC_None) {
354 if (Slot == Record.size()) return nullptr;
355 unsigned ValNo = (unsigned)decodeSignRotatedValue(Record[Slot]);
356 // Adjust the ValNo, if it was encoded relative to the InstNum.
357 if (UseRelativeIDs)
358 ValNo = InstNum - ValNo;
359 return getFnValueByID(ValNo, Ty, OC);
360 }
361
362 /// Converts alignment exponent (i.e. power of two (or zero)) to the
363 /// corresponding alignment to use. If alignment is too large, returns
364 /// a corresponding error code.
365 std::error_code parseAlignmentValue(uint64_t Exponent, unsigned &Alignment);
366 std::error_code parseAttrKind(uint64_t Code, Attribute::AttrKind *Kind);
367 std::error_code parseModule(bool Resume, bool ShouldLazyLoadMetadata = false);
368 std::error_code parseAttributeBlock();
369 std::error_code parseAttributeGroupBlock();
370 std::error_code parseTypeTable();
371 std::error_code parseTypeTableBody();
372
373 std::error_code parseValueSymbolTable();
374 std::error_code parseConstants();
375 std::error_code rememberAndSkipFunctionBody();
376 /// Save the positions of the Metadata blocks and skip parsing the blocks.
377 std::error_code rememberAndSkipMetadata();
378 std::error_code parseFunctionBody(Function *F);
379 std::error_code globalCleanup();
380 std::error_code resolveGlobalAndAliasInits();
381 std::error_code parseMetadata();
382 std::error_code parseMetadataAttachment(Function &F);
383 ErrorOr<std::string> parseModuleTriple();
384 std::error_code parseUseLists();
385 std::error_code initStream(std::unique_ptr<DataStreamer> Streamer);
386 std::error_code initStreamFromBuffer();
387 std::error_code initLazyStream(std::unique_ptr<DataStreamer> Streamer);
388 std::error_code findFunctionInStream(
389 Function *F,
390 DenseMap<Function *, uint64_t>::iterator DeferredFunctionInfoIterator);
391};
392} // namespace
393
394BitcodeDiagnosticInfo::BitcodeDiagnosticInfo(std::error_code EC,
395 DiagnosticSeverity Severity,
396 const Twine &Msg)
397 : DiagnosticInfo(DK_Bitcode, Severity), Msg(Msg), EC(EC) {}
398
399void BitcodeDiagnosticInfo::print(DiagnosticPrinter &DP) const { DP << Msg; }
400
401static std::error_code error(DiagnosticHandlerFunction DiagnosticHandler,
402 std::error_code EC, const Twine &Message) {
403 BitcodeDiagnosticInfo DI(EC, DS_Error, Message);
404 DiagnosticHandler(DI);
405 return EC;
406}
407
408static std::error_code error(DiagnosticHandlerFunction DiagnosticHandler,
409 std::error_code EC) {
410 return error(DiagnosticHandler, EC, EC.message());
411}
412
413static std::error_code error(DiagnosticHandlerFunction DiagnosticHandler,
414 const Twine &Message) {
415 return error(DiagnosticHandler,
416 make_error_code(BitcodeError::CorruptedBitcode), Message);
417}
418
419std::error_code BitcodeReader::error(BitcodeError E, const Twine &Message) {
420 return ::error(DiagnosticHandler, make_error_code(E), Message);
421}
422
423std::error_code BitcodeReader::error(const Twine &Message) {
424 return ::error(DiagnosticHandler,
425 make_error_code(BitcodeError::CorruptedBitcode), Message);
426}
427
428std::error_code BitcodeReader::error(BitcodeError E) {
429 return ::error(DiagnosticHandler, make_error_code(E));
430}
431
432static DiagnosticHandlerFunction getDiagHandler(DiagnosticHandlerFunction F,
433 LLVMContext &C) {
434 if (F)
435 return F;
436 return [&C](const DiagnosticInfo &DI) { C.diagnose(DI); };
437}
438
439BitcodeReader::BitcodeReader(MemoryBuffer *Buffer, LLVMContext &Context,
440 DiagnosticHandlerFunction DiagnosticHandler)
441 : Context(Context),
442 DiagnosticHandler(getDiagHandler(DiagnosticHandler, Context)),
443 Buffer(Buffer), ValueList(Context), MDValueList(Context) {}
444
445BitcodeReader::BitcodeReader(LLVMContext &Context,
446 DiagnosticHandlerFunction DiagnosticHandler)
447 : Context(Context),
448 DiagnosticHandler(getDiagHandler(DiagnosticHandler, Context)),
449 Buffer(nullptr), ValueList(Context), MDValueList(Context) {}
450
451std::error_code BitcodeReader::materializeForwardReferencedFunctions() {
452 if (WillMaterializeAllForwardRefs)
453 return std::error_code();
454
455 // Prevent recursion.
456 WillMaterializeAllForwardRefs = true;
457
458 while (!BasicBlockFwdRefQueue.empty()) {
459 Function *F = BasicBlockFwdRefQueue.front();
460 BasicBlockFwdRefQueue.pop_front();
461 assert(F && "Expected valid function")((F && "Expected valid function") ? static_cast<void
> (0) : __assert_fail ("F && \"Expected valid function\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 461, __PRETTY_FUNCTION__));
462 if (!BasicBlockFwdRefs.count(F))
463 // Already materialized.
464 continue;
465
466 // Check for a function that isn't materializable to prevent an infinite
467 // loop. When parsing a blockaddress stored in a global variable, there
468 // isn't a trivial way to check if a function will have a body without a
469 // linear search through FunctionsWithBodies, so just check it here.
470 if (!F->isMaterializable())
471 return error("Never resolved function from blockaddress");
472
473 // Try to materialize F.
474 if (std::error_code EC = materialize(F))
475 return EC;
476 }
477 assert(BasicBlockFwdRefs.empty() && "Function missing from queue")((BasicBlockFwdRefs.empty() && "Function missing from queue"
) ? static_cast<void> (0) : __assert_fail ("BasicBlockFwdRefs.empty() && \"Function missing from queue\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 477, __PRETTY_FUNCTION__));
478
479 // Reset state.
480 WillMaterializeAllForwardRefs = false;
481 return std::error_code();
482}
483
484void BitcodeReader::freeState() {
485 Buffer = nullptr;
486 std::vector<Type*>().swap(TypeList);
487 ValueList.clear();
488 MDValueList.clear();
489 std::vector<Comdat *>().swap(ComdatList);
490
491 std::vector<AttributeSet>().swap(MAttributes);
492 std::vector<BasicBlock*>().swap(FunctionBBs);
493 std::vector<Function*>().swap(FunctionsWithBodies);
494 DeferredFunctionInfo.clear();
495 DeferredMetadataInfo.clear();
496 MDKindMap.clear();
497
498 assert(BasicBlockFwdRefs.empty() && "Unresolved blockaddress fwd references")((BasicBlockFwdRefs.empty() && "Unresolved blockaddress fwd references"
) ? static_cast<void> (0) : __assert_fail ("BasicBlockFwdRefs.empty() && \"Unresolved blockaddress fwd references\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 498, __PRETTY_FUNCTION__));
499 BasicBlockFwdRefQueue.clear();
500}
501
502//===----------------------------------------------------------------------===//
503// Helper functions to implement forward reference resolution, etc.
504//===----------------------------------------------------------------------===//
505
506/// Convert a string from a record into an std::string, return true on failure.
507template <typename StrTy>
508static bool convertToString(ArrayRef<uint64_t> Record, unsigned Idx,
509 StrTy &Result) {
510 if (Idx > Record.size())
511 return true;
512
513 for (unsigned i = Idx, e = Record.size(); i != e; ++i)
514 Result += (char)Record[i];
515 return false;
516}
517
518static bool hasImplicitComdat(size_t Val) {
519 switch (Val) {
520 default:
521 return false;
522 case 1: // Old WeakAnyLinkage
523 case 4: // Old LinkOnceAnyLinkage
524 case 10: // Old WeakODRLinkage
525 case 11: // Old LinkOnceODRLinkage
526 return true;
527 }
528}
529
530static GlobalValue::LinkageTypes getDecodedLinkage(unsigned Val) {
531 switch (Val) {
532 default: // Map unknown/new linkages to external
533 case 0:
534 return GlobalValue::ExternalLinkage;
535 case 2:
536 return GlobalValue::AppendingLinkage;
537 case 3:
538 return GlobalValue::InternalLinkage;
539 case 5:
540 return GlobalValue::ExternalLinkage; // Obsolete DLLImportLinkage
541 case 6:
542 return GlobalValue::ExternalLinkage; // Obsolete DLLExportLinkage
543 case 7:
544 return GlobalValue::ExternalWeakLinkage;
545 case 8:
546 return GlobalValue::CommonLinkage;
547 case 9:
548 return GlobalValue::PrivateLinkage;
549 case 12:
550 return GlobalValue::AvailableExternallyLinkage;
551 case 13:
552 return GlobalValue::PrivateLinkage; // Obsolete LinkerPrivateLinkage
553 case 14:
554 return GlobalValue::PrivateLinkage; // Obsolete LinkerPrivateWeakLinkage
555 case 15:
556 return GlobalValue::ExternalLinkage; // Obsolete LinkOnceODRAutoHideLinkage
557 case 1: // Old value with implicit comdat.
558 case 16:
559 return GlobalValue::WeakAnyLinkage;
560 case 10: // Old value with implicit comdat.
561 case 17:
562 return GlobalValue::WeakODRLinkage;
563 case 4: // Old value with implicit comdat.
564 case 18:
565 return GlobalValue::LinkOnceAnyLinkage;
566 case 11: // Old value with implicit comdat.
567 case 19:
568 return GlobalValue::LinkOnceODRLinkage;
569 }
570}
571
572static GlobalValue::VisibilityTypes getDecodedVisibility(unsigned Val) {
573 switch (Val) {
574 default: // Map unknown visibilities to default.
575 case 0: return GlobalValue::DefaultVisibility;
576 case 1: return GlobalValue::HiddenVisibility;
577 case 2: return GlobalValue::ProtectedVisibility;
578 }
579}
580
581static GlobalValue::DLLStorageClassTypes
582getDecodedDLLStorageClass(unsigned Val) {
583 switch (Val) {
584 default: // Map unknown values to default.
585 case 0: return GlobalValue::DefaultStorageClass;
586 case 1: return GlobalValue::DLLImportStorageClass;
587 case 2: return GlobalValue::DLLExportStorageClass;
588 }
589}
590
591static GlobalVariable::ThreadLocalMode getDecodedThreadLocalMode(unsigned Val) {
592 switch (Val) {
593 case 0: return GlobalVariable::NotThreadLocal;
594 default: // Map unknown non-zero value to general dynamic.
595 case 1: return GlobalVariable::GeneralDynamicTLSModel;
596 case 2: return GlobalVariable::LocalDynamicTLSModel;
597 case 3: return GlobalVariable::InitialExecTLSModel;
598 case 4: return GlobalVariable::LocalExecTLSModel;
599 }
600}
601
602static int getDecodedCastOpcode(unsigned Val) {
603 switch (Val) {
604 default: return -1;
605 case bitc::CAST_TRUNC : return Instruction::Trunc;
606 case bitc::CAST_ZEXT : return Instruction::ZExt;
607 case bitc::CAST_SEXT : return Instruction::SExt;
608 case bitc::CAST_FPTOUI : return Instruction::FPToUI;
609 case bitc::CAST_FPTOSI : return Instruction::FPToSI;
610 case bitc::CAST_UITOFP : return Instruction::UIToFP;
611 case bitc::CAST_SITOFP : return Instruction::SIToFP;
612 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc;
613 case bitc::CAST_FPEXT : return Instruction::FPExt;
614 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt;
615 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr;
616 case bitc::CAST_BITCAST : return Instruction::BitCast;
617 case bitc::CAST_ADDRSPACECAST: return Instruction::AddrSpaceCast;
618 }
619}
620
621static int getDecodedBinaryOpcode(unsigned Val, Type *Ty) {
622 bool IsFP = Ty->isFPOrFPVectorTy();
623 // BinOps are only valid for int/fp or vector of int/fp types
624 if (!IsFP && !Ty->isIntOrIntVectorTy())
625 return -1;
626
627 switch (Val) {
628 default:
629 return -1;
630 case bitc::BINOP_ADD:
631 return IsFP ? Instruction::FAdd : Instruction::Add;
632 case bitc::BINOP_SUB:
633 return IsFP ? Instruction::FSub : Instruction::Sub;
634 case bitc::BINOP_MUL:
635 return IsFP ? Instruction::FMul : Instruction::Mul;
636 case bitc::BINOP_UDIV:
637 return IsFP ? -1 : Instruction::UDiv;
638 case bitc::BINOP_SDIV:
639 return IsFP ? Instruction::FDiv : Instruction::SDiv;
640 case bitc::BINOP_UREM:
641 return IsFP ? -1 : Instruction::URem;
642 case bitc::BINOP_SREM:
643 return IsFP ? Instruction::FRem : Instruction::SRem;
644 case bitc::BINOP_SHL:
645 return IsFP ? -1 : Instruction::Shl;
646 case bitc::BINOP_LSHR:
647 return IsFP ? -1 : Instruction::LShr;
648 case bitc::BINOP_ASHR:
649 return IsFP ? -1 : Instruction::AShr;
650 case bitc::BINOP_AND:
651 return IsFP ? -1 : Instruction::And;
652 case bitc::BINOP_OR:
653 return IsFP ? -1 : Instruction::Or;
654 case bitc::BINOP_XOR:
655 return IsFP ? -1 : Instruction::Xor;
656 }
657}
658
659static AtomicRMWInst::BinOp getDecodedRMWOperation(unsigned Val) {
660 switch (Val) {
661 default: return AtomicRMWInst::BAD_BINOP;
662 case bitc::RMW_XCHG: return AtomicRMWInst::Xchg;
663 case bitc::RMW_ADD: return AtomicRMWInst::Add;
664 case bitc::RMW_SUB: return AtomicRMWInst::Sub;
665 case bitc::RMW_AND: return AtomicRMWInst::And;
666 case bitc::RMW_NAND: return AtomicRMWInst::Nand;
667 case bitc::RMW_OR: return AtomicRMWInst::Or;
668 case bitc::RMW_XOR: return AtomicRMWInst::Xor;
669 case bitc::RMW_MAX: return AtomicRMWInst::Max;
670 case bitc::RMW_MIN: return AtomicRMWInst::Min;
671 case bitc::RMW_UMAX: return AtomicRMWInst::UMax;
672 case bitc::RMW_UMIN: return AtomicRMWInst::UMin;
673 }
674}
675
676static AtomicOrdering getDecodedOrdering(unsigned Val) {
677 switch (Val) {
678 case bitc::ORDERING_NOTATOMIC: return NotAtomic;
679 case bitc::ORDERING_UNORDERED: return Unordered;
680 case bitc::ORDERING_MONOTONIC: return Monotonic;
681 case bitc::ORDERING_ACQUIRE: return Acquire;
682 case bitc::ORDERING_RELEASE: return Release;
683 case bitc::ORDERING_ACQREL: return AcquireRelease;
684 default: // Map unknown orderings to sequentially-consistent.
685 case bitc::ORDERING_SEQCST: return SequentiallyConsistent;
686 }
687}
688
689static SynchronizationScope getDecodedSynchScope(unsigned Val) {
690 switch (Val) {
691 case bitc::SYNCHSCOPE_SINGLETHREAD: return SingleThread;
692 default: // Map unknown scopes to cross-thread.
693 case bitc::SYNCHSCOPE_CROSSTHREAD: return CrossThread;
694 }
695}
696
697static Comdat::SelectionKind getDecodedComdatSelectionKind(unsigned Val) {
698 switch (Val) {
699 default: // Map unknown selection kinds to any.
700 case bitc::COMDAT_SELECTION_KIND_ANY:
701 return Comdat::Any;
702 case bitc::COMDAT_SELECTION_KIND_EXACT_MATCH:
703 return Comdat::ExactMatch;
704 case bitc::COMDAT_SELECTION_KIND_LARGEST:
705 return Comdat::Largest;
706 case bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES:
707 return Comdat::NoDuplicates;
708 case bitc::COMDAT_SELECTION_KIND_SAME_SIZE:
709 return Comdat::SameSize;
710 }
711}
712
713static FastMathFlags getDecodedFastMathFlags(unsigned Val) {
714 FastMathFlags FMF;
715 if (0 != (Val & FastMathFlags::UnsafeAlgebra))
716 FMF.setUnsafeAlgebra();
717 if (0 != (Val & FastMathFlags::NoNaNs))
718 FMF.setNoNaNs();
719 if (0 != (Val & FastMathFlags::NoInfs))
720 FMF.setNoInfs();
721 if (0 != (Val & FastMathFlags::NoSignedZeros))
722 FMF.setNoSignedZeros();
723 if (0 != (Val & FastMathFlags::AllowReciprocal))
724 FMF.setAllowReciprocal();
725 return FMF;
726}
727
728static void upgradeDLLImportExportLinkage(llvm::GlobalValue *GV, unsigned Val) {
729 switch (Val) {
730 case 5: GV->setDLLStorageClass(GlobalValue::DLLImportStorageClass); break;
731 case 6: GV->setDLLStorageClass(GlobalValue::DLLExportStorageClass); break;
732 }
733}
734
735namespace llvm {
736namespace {
737/// \brief A class for maintaining the slot number definition
738/// as a placeholder for the actual definition for forward constants defs.
739class ConstantPlaceHolder : public ConstantExpr {
740 void operator=(const ConstantPlaceHolder &) = delete;
741
742public:
743 // allocate space for exactly one operand
744 void *operator new(size_t s) { return User::operator new(s, 1); }
745 explicit ConstantPlaceHolder(Type *Ty, LLVMContext &Context)
746 : ConstantExpr(Ty, Instruction::UserOp1, &Op<0>(), 1) {
747 Op<0>() = UndefValue::get(Type::getInt32Ty(Context));
748 }
749
750 /// \brief Methods to support type inquiry through isa, cast, and dyn_cast.
751 static bool classof(const Value *V) {
752 return isa<ConstantExpr>(V) &&
753 cast<ConstantExpr>(V)->getOpcode() == Instruction::UserOp1;
754 }
755
756 /// Provide fast operand accessors
757 DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value)public: inline Value *getOperand(unsigned) const; inline void
setOperand(unsigned, Value*); inline op_iterator op_begin();
inline const_op_iterator op_begin() const; inline op_iterator
op_end(); inline const_op_iterator op_end() const; protected
: template <int> inline Use &Op(); template <int
> inline const Use &Op() const; public: inline unsigned
getNumOperands() const;
758};
759}
760
761// FIXME: can we inherit this from ConstantExpr?
762template <>
763struct OperandTraits<ConstantPlaceHolder> :
764 public FixedNumOperandTraits<ConstantPlaceHolder, 1> {
765};
766DEFINE_TRANSPARENT_OPERAND_ACCESSORS(ConstantPlaceHolder, Value)ConstantPlaceHolder::op_iterator ConstantPlaceHolder::op_begin
() { return OperandTraits<ConstantPlaceHolder>::op_begin
(this); } ConstantPlaceHolder::const_op_iterator ConstantPlaceHolder
::op_begin() const { return OperandTraits<ConstantPlaceHolder
>::op_begin(const_cast<ConstantPlaceHolder*>(this));
} ConstantPlaceHolder::op_iterator ConstantPlaceHolder::op_end
() { return OperandTraits<ConstantPlaceHolder>::op_end(
this); } ConstantPlaceHolder::const_op_iterator ConstantPlaceHolder
::op_end() const { return OperandTraits<ConstantPlaceHolder
>::op_end(const_cast<ConstantPlaceHolder*>(this)); }
Value *ConstantPlaceHolder::getOperand(unsigned i_nocapture)
const { ((i_nocapture < OperandTraits<ConstantPlaceHolder
>::operands(this) && "getOperand() out of range!")
? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<ConstantPlaceHolder>::operands(this) && \"getOperand() out of range!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 766, __PRETTY_FUNCTION__)); return cast_or_null<Value>
( OperandTraits<ConstantPlaceHolder>::op_begin(const_cast
<ConstantPlaceHolder*>(this))[i_nocapture].get()); } void
ConstantPlaceHolder::setOperand(unsigned i_nocapture, Value *
Val_nocapture) { ((i_nocapture < OperandTraits<ConstantPlaceHolder
>::operands(this) && "setOperand() out of range!")
? static_cast<void> (0) : __assert_fail ("i_nocapture < OperandTraits<ConstantPlaceHolder>::operands(this) && \"setOperand() out of range!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 766, __PRETTY_FUNCTION__)); OperandTraits<ConstantPlaceHolder
>::op_begin(this)[i_nocapture] = Val_nocapture; } unsigned
ConstantPlaceHolder::getNumOperands() const { return OperandTraits
<ConstantPlaceHolder>::operands(this); } template <int
Idx_nocapture> Use &ConstantPlaceHolder::Op() { return
this->OpFrom<Idx_nocapture>(this); } template <int
Idx_nocapture> const Use &ConstantPlaceHolder::Op() const
{ return this->OpFrom<Idx_nocapture>(this); }
767}
768
769bool BitcodeReaderValueList::assignValue(Value *V, unsigned Idx) {
770 if (Idx == size()) {
771 push_back(V);
772 return false;
773 }
774
775 if (Idx >= size())
776 resize(Idx+1);
777
778 WeakVH &OldV = ValuePtrs[Idx];
779 if (!OldV) {
780 OldV = V;
781 return false;
782 }
783
784 // Handle constants and non-constants (e.g. instrs) differently for
785 // efficiency.
786 if (Constant *PHC = dyn_cast<Constant>(&*OldV)) {
787 ResolveConstants.push_back(std::make_pair(PHC, Idx));
788 OldV = V;
789 } else {
790 // If there was a forward reference to this value, replace it.
791 Value *PrevVal = OldV;
792 // Check operator constraints. We only put cleanuppads or catchpads in
793 // the forward value map if the value is constrained to match.
794 if (CatchPadInst *CatchPad = dyn_cast<CatchPadInst>(PrevVal)) {
795 if (!isa<CatchPadInst>(V))
796 return true;
797 // Delete the dummy basic block that was created with the sentinel
798 // catchpad.
799 BasicBlock *DummyBlock = CatchPad->getUnwindDest();
800 assert(DummyBlock == CatchPad->getNormalDest())((DummyBlock == CatchPad->getNormalDest()) ? static_cast<
void> (0) : __assert_fail ("DummyBlock == CatchPad->getNormalDest()"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 800, __PRETTY_FUNCTION__));
801 CatchPad->dropAllReferences();
802 delete DummyBlock;
803 } else if (isa<CleanupPadInst>(PrevVal)) {
804 if (!isa<CleanupPadInst>(V))
805 return true;
806 }
807 OldV->replaceAllUsesWith(V);
808 delete PrevVal;
809 }
810
811 return false;
812}
813
814
815Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx,
816 Type *Ty) {
817 if (Idx >= size())
818 resize(Idx + 1);
819
820 if (Value *V = ValuePtrs[Idx]) {
821 if (Ty != V->getType())
822 report_fatal_error("Type mismatch in constant table!");
823 return cast<Constant>(V);
824 }
825
826 // Create and return a placeholder, which will later be RAUW'd.
827 Constant *C = new ConstantPlaceHolder(Ty, Context);
828 ValuePtrs[Idx] = C;
829 return C;
830}
831
832Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, Type *Ty,
833 OperatorConstraint OC) {
834 // Bail out for a clearly invalid value. This would make us call resize(0)
835 if (Idx == UINT_MAX(2147483647 *2U +1U))
836 return nullptr;
837
838 if (Idx >= size())
839 resize(Idx + 1);
840
841 if (Value *V = ValuePtrs[Idx]) {
842 // If the types don't match, it's invalid.
843 if (Ty && Ty != V->getType())
844 return nullptr;
845 if (!OC)
846 return V;
847 // Use dyn_cast to enforce operator constraints
848 switch (OC) {
849 case OC_CatchPad:
850 return dyn_cast<CatchPadInst>(V);
851 case OC_CleanupPad:
852 return dyn_cast<CleanupPadInst>(V);
853 default:
854 llvm_unreachable("Unexpected operator constraint")::llvm::llvm_unreachable_internal("Unexpected operator constraint"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 854);
855 }
856 }
857
858 // No type specified, must be invalid reference.
859 if (!Ty) return nullptr;
860
861 // Create and return a placeholder, which will later be RAUW'd.
862 Value *V;
863 switch (OC) {
864 case OC_None:
865 V = new Argument(Ty);
866 break;
867 case OC_CatchPad: {
868 BasicBlock *BB = BasicBlock::Create(Context);
869 V = CatchPadInst::Create(BB, BB, {});
870 break;
871 }
872 default:
873 assert(OC == OC_CleanupPad && "unexpected operator constraint")((OC == OC_CleanupPad && "unexpected operator constraint"
) ? static_cast<void> (0) : __assert_fail ("OC == OC_CleanupPad && \"unexpected operator constraint\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 873, __PRETTY_FUNCTION__));
874 V = CleanupPadInst::Create(Context, {});
875 break;
876 }
877
878 ValuePtrs[Idx] = V;
879 return V;
880}
881
882/// Once all constants are read, this method bulk resolves any forward
883/// references. The idea behind this is that we sometimes get constants (such
884/// as large arrays) which reference *many* forward ref constants. Replacing
885/// each of these causes a lot of thrashing when building/reuniquing the
886/// constant. Instead of doing this, we look at all the uses and rewrite all
887/// the place holders at once for any constant that uses a placeholder.
888void BitcodeReaderValueList::resolveConstantForwardRefs() {
889 // Sort the values by-pointer so that they are efficient to look up with a
890 // binary search.
891 std::sort(ResolveConstants.begin(), ResolveConstants.end());
892
893 SmallVector<Constant*, 64> NewOps;
894
895 while (!ResolveConstants.empty()) {
896 Value *RealVal = operator[](ResolveConstants.back().second);
897 Constant *Placeholder = ResolveConstants.back().first;
898 ResolveConstants.pop_back();
899
900 // Loop over all users of the placeholder, updating them to reference the
901 // new value. If they reference more than one placeholder, update them all
902 // at once.
903 while (!Placeholder->use_empty()) {
904 auto UI = Placeholder->user_begin();
905 User *U = *UI;
906
907 // If the using object isn't uniqued, just update the operands. This
908 // handles instructions and initializers for global variables.
909 if (!isa<Constant>(U) || isa<GlobalValue>(U)) {
910 UI.getUse().set(RealVal);
911 continue;
912 }
913
914 // Otherwise, we have a constant that uses the placeholder. Replace that
915 // constant with a new constant that has *all* placeholder uses updated.
916 Constant *UserC = cast<Constant>(U);
917 for (User::op_iterator I = UserC->op_begin(), E = UserC->op_end();
918 I != E; ++I) {
919 Value *NewOp;
920 if (!isa<ConstantPlaceHolder>(*I)) {
921 // Not a placeholder reference.
922 NewOp = *I;
923 } else if (*I == Placeholder) {
924 // Common case is that it just references this one placeholder.
925 NewOp = RealVal;
926 } else {
927 // Otherwise, look up the placeholder in ResolveConstants.
928 ResolveConstantsTy::iterator It =
929 std::lower_bound(ResolveConstants.begin(), ResolveConstants.end(),
930 std::pair<Constant*, unsigned>(cast<Constant>(*I),
931 0));
932 assert(It != ResolveConstants.end() && It->first == *I)((It != ResolveConstants.end() && It->first == *I)
? static_cast<void> (0) : __assert_fail ("It != ResolveConstants.end() && It->first == *I"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 932, __PRETTY_FUNCTION__));
933 NewOp = operator[](It->second);
934 }
935
936 NewOps.push_back(cast<Constant>(NewOp));
937 }
938
939 // Make the new constant.
940 Constant *NewC;
941 if (ConstantArray *UserCA = dyn_cast<ConstantArray>(UserC)) {
942 NewC = ConstantArray::get(UserCA->getType(), NewOps);
943 } else if (ConstantStruct *UserCS = dyn_cast<ConstantStruct>(UserC)) {
944 NewC = ConstantStruct::get(UserCS->getType(), NewOps);
945 } else if (isa<ConstantVector>(UserC)) {
946 NewC = ConstantVector::get(NewOps);
947 } else {
948 assert(isa<ConstantExpr>(UserC) && "Must be a ConstantExpr.")((isa<ConstantExpr>(UserC) && "Must be a ConstantExpr."
) ? static_cast<void> (0) : __assert_fail ("isa<ConstantExpr>(UserC) && \"Must be a ConstantExpr.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 948, __PRETTY_FUNCTION__));
949 NewC = cast<ConstantExpr>(UserC)->getWithOperands(NewOps);
950 }
951
952 UserC->replaceAllUsesWith(NewC);
953 UserC->destroyConstant();
954 NewOps.clear();
955 }
956
957 // Update all ValueHandles, they should be the only users at this point.
958 Placeholder->replaceAllUsesWith(RealVal);
959 delete Placeholder;
960 }
961}
962
963void BitcodeReaderMDValueList::assignValue(Metadata *MD, unsigned Idx) {
964 if (Idx == size()) {
965 push_back(MD);
966 return;
967 }
968
969 if (Idx >= size())
970 resize(Idx+1);
971
972 TrackingMDRef &OldMD = MDValuePtrs[Idx];
973 if (!OldMD) {
974 OldMD.reset(MD);
975 return;
976 }
977
978 // If there was a forward reference to this value, replace it.
979 TempMDTuple PrevMD(cast<MDTuple>(OldMD.get()));
980 PrevMD->replaceAllUsesWith(MD);
981 --NumFwdRefs;
982}
983
984Metadata *BitcodeReaderMDValueList::getValueFwdRef(unsigned Idx) {
985 if (Idx >= size())
986 resize(Idx + 1);
987
988 if (Metadata *MD = MDValuePtrs[Idx])
989 return MD;
990
991 // Track forward refs to be resolved later.
992 if (AnyFwdRefs) {
993 MinFwdRef = std::min(MinFwdRef, Idx);
994 MaxFwdRef = std::max(MaxFwdRef, Idx);
995 } else {
996 AnyFwdRefs = true;
997 MinFwdRef = MaxFwdRef = Idx;
998 }
999 ++NumFwdRefs;
1000
1001 // Create and return a placeholder, which will later be RAUW'd.
1002 Metadata *MD = MDNode::getTemporary(Context, None).release();
1003 MDValuePtrs[Idx].reset(MD);
1004 return MD;
1005}
1006
1007void BitcodeReaderMDValueList::tryToResolveCycles() {
1008 if (!AnyFwdRefs)
1009 // Nothing to do.
1010 return;
1011
1012 if (NumFwdRefs)
1013 // Still forward references... can't resolve cycles.
1014 return;
1015
1016 // Resolve any cycles.
1017 for (unsigned I = MinFwdRef, E = MaxFwdRef + 1; I != E; ++I) {
1018 auto &MD = MDValuePtrs[I];
1019 auto *N = dyn_cast_or_null<MDNode>(MD);
1020 if (!N)
1021 continue;
1022
1023 assert(!N->isTemporary() && "Unexpected forward reference")((!N->isTemporary() && "Unexpected forward reference"
) ? static_cast<void> (0) : __assert_fail ("!N->isTemporary() && \"Unexpected forward reference\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1023, __PRETTY_FUNCTION__));
1024 N->resolveCycles();
1025 }
1026
1027 // Make sure we return early again until there's another forward ref.
1028 AnyFwdRefs = false;
1029}
1030
1031Type *BitcodeReader::getTypeByID(unsigned ID) {
1032 // The type table size is always specified correctly.
1033 if (ID >= TypeList.size())
1034 return nullptr;
1035
1036 if (Type *Ty = TypeList[ID])
1037 return Ty;
1038
1039 // If we have a forward reference, the only possible case is when it is to a
1040 // named struct. Just create a placeholder for now.
1041 return TypeList[ID] = createIdentifiedStructType(Context);
1042}
1043
1044StructType *BitcodeReader::createIdentifiedStructType(LLVMContext &Context,
1045 StringRef Name) {
1046 auto *Ret = StructType::create(Context, Name);
1047 IdentifiedStructTypes.push_back(Ret);
1048 return Ret;
1049}
1050
1051StructType *BitcodeReader::createIdentifiedStructType(LLVMContext &Context) {
1052 auto *Ret = StructType::create(Context);
1053 IdentifiedStructTypes.push_back(Ret);
1054 return Ret;
1055}
1056
1057
1058//===----------------------------------------------------------------------===//
1059// Functions for parsing blocks from the bitcode file
1060//===----------------------------------------------------------------------===//
1061
1062
1063/// \brief This fills an AttrBuilder object with the LLVM attributes that have
1064/// been decoded from the given integer. This function must stay in sync with
1065/// 'encodeLLVMAttributesForBitcode'.
1066static void decodeLLVMAttributesForBitcode(AttrBuilder &B,
1067 uint64_t EncodedAttrs) {
1068 // FIXME: Remove in 4.0.
1069
1070 // The alignment is stored as a 16-bit raw value from bits 31--16. We shift
1071 // the bits above 31 down by 11 bits.
1072 unsigned Alignment = (EncodedAttrs & (0xffffULL << 16)) >> 16;
1073 assert((!Alignment || isPowerOf2_32(Alignment)) &&(((!Alignment || isPowerOf2_32(Alignment)) && "Alignment must be a power of two."
) ? static_cast<void> (0) : __assert_fail ("(!Alignment || isPowerOf2_32(Alignment)) && \"Alignment must be a power of two.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1074, __PRETTY_FUNCTION__))
1074 "Alignment must be a power of two.")(((!Alignment || isPowerOf2_32(Alignment)) && "Alignment must be a power of two."
) ? static_cast<void> (0) : __assert_fail ("(!Alignment || isPowerOf2_32(Alignment)) && \"Alignment must be a power of two.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1074, __PRETTY_FUNCTION__));
1075
1076 if (Alignment)
1077 B.addAlignmentAttr(Alignment);
1078 B.addRawValue(((EncodedAttrs & (0xfffffULL << 32)) >> 11) |
1079 (EncodedAttrs & 0xffff));
1080}
1081
1082std::error_code BitcodeReader::parseAttributeBlock() {
1083 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
1084 return error("Invalid record");
1085
1086 if (!MAttributes.empty())
1087 return error("Invalid multiple blocks");
1088
1089 SmallVector<uint64_t, 64> Record;
1090
1091 SmallVector<AttributeSet, 8> Attrs;
1092
1093 // Read all the records.
1094 while (1) {
1095 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
1096
1097 switch (Entry.Kind) {
1098 case BitstreamEntry::SubBlock: // Handled for us already.
1099 case BitstreamEntry::Error:
1100 return error("Malformed block");
1101 case BitstreamEntry::EndBlock:
1102 return std::error_code();
1103 case BitstreamEntry::Record:
1104 // The interesting case.
1105 break;
1106 }
1107
1108 // Read a record.
1109 Record.clear();
1110 switch (Stream.readRecord(Entry.ID, Record)) {
1111 default: // Default behavior: ignore.
1112 break;
1113 case bitc::PARAMATTR_CODE_ENTRY_OLD: { // ENTRY: [paramidx0, attr0, ...]
1114 // FIXME: Remove in 4.0.
1115 if (Record.size() & 1)
1116 return error("Invalid record");
1117
1118 for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
1119 AttrBuilder B;
1120 decodeLLVMAttributesForBitcode(B, Record[i+1]);
1121 Attrs.push_back(AttributeSet::get(Context, Record[i], B));
1122 }
1123
1124 MAttributes.push_back(AttributeSet::get(Context, Attrs));
1125 Attrs.clear();
1126 break;
1127 }
1128 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [attrgrp0, attrgrp1, ...]
1129 for (unsigned i = 0, e = Record.size(); i != e; ++i)
1130 Attrs.push_back(MAttributeGroups[Record[i]]);
1131
1132 MAttributes.push_back(AttributeSet::get(Context, Attrs));
1133 Attrs.clear();
1134 break;
1135 }
1136 }
1137 }
1138}
1139
1140// Returns Attribute::None on unrecognized codes.
1141static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
1142 switch (Code) {
1143 default:
1144 return Attribute::None;
1145 case bitc::ATTR_KIND_ALIGNMENT:
1146 return Attribute::Alignment;
1147 case bitc::ATTR_KIND_ALWAYS_INLINE:
1148 return Attribute::AlwaysInline;
1149 case bitc::ATTR_KIND_ARGMEMONLY:
1150 return Attribute::ArgMemOnly;
1151 case bitc::ATTR_KIND_BUILTIN:
1152 return Attribute::Builtin;
1153 case bitc::ATTR_KIND_BY_VAL:
1154 return Attribute::ByVal;
1155 case bitc::ATTR_KIND_IN_ALLOCA:
1156 return Attribute::InAlloca;
1157 case bitc::ATTR_KIND_COLD:
1158 return Attribute::Cold;
1159 case bitc::ATTR_KIND_CONVERGENT:
1160 return Attribute::Convergent;
1161 case bitc::ATTR_KIND_INLINE_HINT:
1162 return Attribute::InlineHint;
1163 case bitc::ATTR_KIND_IN_REG:
1164 return Attribute::InReg;
1165 case bitc::ATTR_KIND_JUMP_TABLE:
1166 return Attribute::JumpTable;
1167 case bitc::ATTR_KIND_MIN_SIZE:
1168 return Attribute::MinSize;
1169 case bitc::ATTR_KIND_NAKED:
1170 return Attribute::Naked;
1171 case bitc::ATTR_KIND_NEST:
1172 return Attribute::Nest;
1173 case bitc::ATTR_KIND_NO_ALIAS:
1174 return Attribute::NoAlias;
1175 case bitc::ATTR_KIND_NO_BUILTIN:
1176 return Attribute::NoBuiltin;
1177 case bitc::ATTR_KIND_NO_CAPTURE:
1178 return Attribute::NoCapture;
1179 case bitc::ATTR_KIND_NO_DUPLICATE:
1180 return Attribute::NoDuplicate;
1181 case bitc::ATTR_KIND_NO_IMPLICIT_FLOAT:
1182 return Attribute::NoImplicitFloat;
1183 case bitc::ATTR_KIND_NO_INLINE:
1184 return Attribute::NoInline;
1185 case bitc::ATTR_KIND_NON_LAZY_BIND:
1186 return Attribute::NonLazyBind;
1187 case bitc::ATTR_KIND_NON_NULL:
1188 return Attribute::NonNull;
1189 case bitc::ATTR_KIND_DEREFERENCEABLE:
1190 return Attribute::Dereferenceable;
1191 case bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL:
1192 return Attribute::DereferenceableOrNull;
1193 case bitc::ATTR_KIND_NO_RED_ZONE:
1194 return Attribute::NoRedZone;
1195 case bitc::ATTR_KIND_NO_RETURN:
1196 return Attribute::NoReturn;
1197 case bitc::ATTR_KIND_NO_UNWIND:
1198 return Attribute::NoUnwind;
1199 case bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE:
1200 return Attribute::OptimizeForSize;
1201 case bitc::ATTR_KIND_OPTIMIZE_NONE:
1202 return Attribute::OptimizeNone;
1203 case bitc::ATTR_KIND_READ_NONE:
1204 return Attribute::ReadNone;
1205 case bitc::ATTR_KIND_READ_ONLY:
1206 return Attribute::ReadOnly;
1207 case bitc::ATTR_KIND_RETURNED:
1208 return Attribute::Returned;
1209 case bitc::ATTR_KIND_RETURNS_TWICE:
1210 return Attribute::ReturnsTwice;
1211 case bitc::ATTR_KIND_S_EXT:
1212 return Attribute::SExt;
1213 case bitc::ATTR_KIND_STACK_ALIGNMENT:
1214 return Attribute::StackAlignment;
1215 case bitc::ATTR_KIND_STACK_PROTECT:
1216 return Attribute::StackProtect;
1217 case bitc::ATTR_KIND_STACK_PROTECT_REQ:
1218 return Attribute::StackProtectReq;
1219 case bitc::ATTR_KIND_STACK_PROTECT_STRONG:
1220 return Attribute::StackProtectStrong;
1221 case bitc::ATTR_KIND_SAFESTACK:
1222 return Attribute::SafeStack;
1223 case bitc::ATTR_KIND_STRUCT_RET:
1224 return Attribute::StructRet;
1225 case bitc::ATTR_KIND_SANITIZE_ADDRESS:
1226 return Attribute::SanitizeAddress;
1227 case bitc::ATTR_KIND_SANITIZE_THREAD:
1228 return Attribute::SanitizeThread;
1229 case bitc::ATTR_KIND_SANITIZE_MEMORY:
1230 return Attribute::SanitizeMemory;
1231 case bitc::ATTR_KIND_UW_TABLE:
1232 return Attribute::UWTable;
1233 case bitc::ATTR_KIND_Z_EXT:
1234 return Attribute::ZExt;
1235 }
1236}
1237
1238std::error_code BitcodeReader::parseAlignmentValue(uint64_t Exponent,
1239 unsigned &Alignment) {
1240 // Note: Alignment in bitcode files is incremented by 1, so that zero
1241 // can be used for default alignment.
1242 if (Exponent > Value::MaxAlignmentExponent + 1)
1243 return error("Invalid alignment value");
1244 Alignment = (1 << static_cast<unsigned>(Exponent)) >> 1;
1245 return std::error_code();
1246}
1247
1248std::error_code BitcodeReader::parseAttrKind(uint64_t Code,
1249 Attribute::AttrKind *Kind) {
1250 *Kind = getAttrFromCode(Code);
1251 if (*Kind == Attribute::None)
1252 return error(BitcodeError::CorruptedBitcode,
1253 "Unknown attribute kind (" + Twine(Code) + ")");
1254 return std::error_code();
1255}
1256
1257std::error_code BitcodeReader::parseAttributeGroupBlock() {
1258 if (Stream.EnterSubBlock(bitc::PARAMATTR_GROUP_BLOCK_ID))
1259 return error("Invalid record");
1260
1261 if (!MAttributeGroups.empty())
1262 return error("Invalid multiple blocks");
1263
1264 SmallVector<uint64_t, 64> Record;
1265
1266 // Read all the records.
1267 while (1) {
1268 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
1269
1270 switch (Entry.Kind) {
1271 case BitstreamEntry::SubBlock: // Handled for us already.
1272 case BitstreamEntry::Error:
1273 return error("Malformed block");
1274 case BitstreamEntry::EndBlock:
1275 return std::error_code();
1276 case BitstreamEntry::Record:
1277 // The interesting case.
1278 break;
1279 }
1280
1281 // Read a record.
1282 Record.clear();
1283 switch (Stream.readRecord(Entry.ID, Record)) {
1284 default: // Default behavior: ignore.
1285 break;
1286 case bitc::PARAMATTR_GRP_CODE_ENTRY: { // ENTRY: [grpid, idx, a0, a1, ...]
1287 if (Record.size() < 3)
1288 return error("Invalid record");
1289
1290 uint64_t GrpID = Record[0];
1291 uint64_t Idx = Record[1]; // Index of the object this attribute refers to.
1292
1293 AttrBuilder B;
1294 for (unsigned i = 2, e = Record.size(); i != e; ++i) {
1295 if (Record[i] == 0) { // Enum attribute
1296 Attribute::AttrKind Kind;
1297 if (std::error_code EC = parseAttrKind(Record[++i], &Kind))
1298 return EC;
1299
1300 B.addAttribute(Kind);
1301 } else if (Record[i] == 1) { // Integer attribute
1302 Attribute::AttrKind Kind;
1303 if (std::error_code EC = parseAttrKind(Record[++i], &Kind))
1304 return EC;
1305 if (Kind == Attribute::Alignment)
1306 B.addAlignmentAttr(Record[++i]);
1307 else if (Kind == Attribute::StackAlignment)
1308 B.addStackAlignmentAttr(Record[++i]);
1309 else if (Kind == Attribute::Dereferenceable)
1310 B.addDereferenceableAttr(Record[++i]);
1311 else if (Kind == Attribute::DereferenceableOrNull)
1312 B.addDereferenceableOrNullAttr(Record[++i]);
1313 } else { // String attribute
1314 assert((Record[i] == 3 || Record[i] == 4) &&(((Record[i] == 3 || Record[i] == 4) && "Invalid attribute group entry"
) ? static_cast<void> (0) : __assert_fail ("(Record[i] == 3 || Record[i] == 4) && \"Invalid attribute group entry\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1315, __PRETTY_FUNCTION__))
1315 "Invalid attribute group entry")(((Record[i] == 3 || Record[i] == 4) && "Invalid attribute group entry"
) ? static_cast<void> (0) : __assert_fail ("(Record[i] == 3 || Record[i] == 4) && \"Invalid attribute group entry\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1315, __PRETTY_FUNCTION__));
1316 bool HasValue = (Record[i++] == 4);
1317 SmallString<64> KindStr;
1318 SmallString<64> ValStr;
1319
1320 while (Record[i] != 0 && i != e)
1321 KindStr += Record[i++];
1322 assert(Record[i] == 0 && "Kind string not null terminated")((Record[i] == 0 && "Kind string not null terminated"
) ? static_cast<void> (0) : __assert_fail ("Record[i] == 0 && \"Kind string not null terminated\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1322, __PRETTY_FUNCTION__));
1323
1324 if (HasValue) {
1325 // Has a value associated with it.
1326 ++i; // Skip the '0' that terminates the "kind" string.
1327 while (Record[i] != 0 && i != e)
1328 ValStr += Record[i++];
1329 assert(Record[i] == 0 && "Value string not null terminated")((Record[i] == 0 && "Value string not null terminated"
) ? static_cast<void> (0) : __assert_fail ("Record[i] == 0 && \"Value string not null terminated\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1329, __PRETTY_FUNCTION__));
1330 }
1331
1332 B.addAttribute(KindStr.str(), ValStr.str());
1333 }
1334 }
1335
1336 MAttributeGroups[GrpID] = AttributeSet::get(Context, Idx, B);
1337 break;
1338 }
1339 }
1340 }
1341}
1342
1343std::error_code BitcodeReader::parseTypeTable() {
1344 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID_NEW))
1345 return error("Invalid record");
1346
1347 return parseTypeTableBody();
1348}
1349
1350std::error_code BitcodeReader::parseTypeTableBody() {
1351 if (!TypeList.empty())
1352 return error("Invalid multiple blocks");
1353
1354 SmallVector<uint64_t, 64> Record;
1355 unsigned NumRecords = 0;
1356
1357 SmallString<64> TypeName;
1358
1359 // Read all the records for this type table.
1360 while (1) {
1361 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
1362
1363 switch (Entry.Kind) {
1364 case BitstreamEntry::SubBlock: // Handled for us already.
1365 case BitstreamEntry::Error:
1366 return error("Malformed block");
1367 case BitstreamEntry::EndBlock:
1368 if (NumRecords != TypeList.size())
1369 return error("Malformed block");
1370 return std::error_code();
1371 case BitstreamEntry::Record:
1372 // The interesting case.
1373 break;
1374 }
1375
1376 // Read a record.
1377 Record.clear();
1378 Type *ResultTy = nullptr;
1379 switch (Stream.readRecord(Entry.ID, Record)) {
1380 default:
1381 return error("Invalid value");
1382 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries]
1383 // TYPE_CODE_NUMENTRY contains a count of the number of types in the
1384 // type list. This allows us to reserve space.
1385 if (Record.size() < 1)
1386 return error("Invalid record");
1387 TypeList.resize(Record[0]);
1388 continue;
1389 case bitc::TYPE_CODE_VOID: // VOID
1390 ResultTy = Type::getVoidTy(Context);
1391 break;
1392 case bitc::TYPE_CODE_HALF: // HALF
1393 ResultTy = Type::getHalfTy(Context);
1394 break;
1395 case bitc::TYPE_CODE_FLOAT: // FLOAT
1396 ResultTy = Type::getFloatTy(Context);
1397 break;
1398 case bitc::TYPE_CODE_DOUBLE: // DOUBLE
1399 ResultTy = Type::getDoubleTy(Context);
1400 break;
1401 case bitc::TYPE_CODE_X86_FP80: // X86_FP80
1402 ResultTy = Type::getX86_FP80Ty(Context);
1403 break;
1404 case bitc::TYPE_CODE_FP128: // FP128
1405 ResultTy = Type::getFP128Ty(Context);
1406 break;
1407 case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128
1408 ResultTy = Type::getPPC_FP128Ty(Context);
1409 break;
1410 case bitc::TYPE_CODE_LABEL: // LABEL
1411 ResultTy = Type::getLabelTy(Context);
1412 break;
1413 case bitc::TYPE_CODE_METADATA: // METADATA
1414 ResultTy = Type::getMetadataTy(Context);
1415 break;
1416 case bitc::TYPE_CODE_X86_MMX: // X86_MMX
1417 ResultTy = Type::getX86_MMXTy(Context);
1418 break;
1419 case bitc::TYPE_CODE_TOKEN: // TOKEN
1420 ResultTy = Type::getTokenTy(Context);
1421 break;
1422 case bitc::TYPE_CODE_INTEGER: { // INTEGER: [width]
1423 if (Record.size() < 1)
1424 return error("Invalid record");
1425
1426 uint64_t NumBits = Record[0];
1427 if (NumBits < IntegerType::MIN_INT_BITS ||
1428 NumBits > IntegerType::MAX_INT_BITS)
1429 return error("Bitwidth for integer type out of range");
1430 ResultTy = IntegerType::get(Context, NumBits);
1431 break;
1432 }
1433 case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or
1434 // [pointee type, address space]
1435 if (Record.size() < 1)
1436 return error("Invalid record");
1437 unsigned AddressSpace = 0;
1438 if (Record.size() == 2)
1439 AddressSpace = Record[1];
1440 ResultTy = getTypeByID(Record[0]);
1441 if (!ResultTy ||
1442 !PointerType::isValidElementType(ResultTy))
1443 return error("Invalid type");
1444 ResultTy = PointerType::get(ResultTy, AddressSpace);
1445 break;
1446 }
1447 case bitc::TYPE_CODE_FUNCTION_OLD: {
1448 // FIXME: attrid is dead, remove it in LLVM 4.0
1449 // FUNCTION: [vararg, attrid, retty, paramty x N]
1450 if (Record.size() < 3)
1451 return error("Invalid record");
1452 SmallVector<Type*, 8> ArgTys;
1453 for (unsigned i = 3, e = Record.size(); i != e; ++i) {
1454 if (Type *T = getTypeByID(Record[i]))
1455 ArgTys.push_back(T);
1456 else
1457 break;
1458 }
1459
1460 ResultTy = getTypeByID(Record[2]);
1461 if (!ResultTy || ArgTys.size() < Record.size()-3)
1462 return error("Invalid type");
1463
1464 ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]);
1465 break;
1466 }
1467 case bitc::TYPE_CODE_FUNCTION: {
1468 // FUNCTION: [vararg, retty, paramty x N]
1469 if (Record.size() < 2)
1470 return error("Invalid record");
1471 SmallVector<Type*, 8> ArgTys;
1472 for (unsigned i = 2, e = Record.size(); i != e; ++i) {
1473 if (Type *T = getTypeByID(Record[i])) {
1474 if (!FunctionType::isValidArgumentType(T))
1475 return error("Invalid function argument type");
1476 ArgTys.push_back(T);
1477 }
1478 else
1479 break;
1480 }
1481
1482 ResultTy = getTypeByID(Record[1]);
1483 if (!ResultTy || ArgTys.size() < Record.size()-2)
1484 return error("Invalid type");
1485
1486 ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]);
1487 break;
1488 }
1489 case bitc::TYPE_CODE_STRUCT_ANON: { // STRUCT: [ispacked, eltty x N]
1490 if (Record.size() < 1)
1491 return error("Invalid record");
1492 SmallVector<Type*, 8> EltTys;
1493 for (unsigned i = 1, e = Record.size(); i != e; ++i) {
1494 if (Type *T = getTypeByID(Record[i]))
1495 EltTys.push_back(T);
1496 else
1497 break;
1498 }
1499 if (EltTys.size() != Record.size()-1)
1500 return error("Invalid type");
1501 ResultTy = StructType::get(Context, EltTys, Record[0]);
1502 break;
1503 }
1504 case bitc::TYPE_CODE_STRUCT_NAME: // STRUCT_NAME: [strchr x N]
1505 if (convertToString(Record, 0, TypeName))
1506 return error("Invalid record");
1507 continue;
1508
1509 case bitc::TYPE_CODE_STRUCT_NAMED: { // STRUCT: [ispacked, eltty x N]
1510 if (Record.size() < 1)
1511 return error("Invalid record");
1512
1513 if (NumRecords >= TypeList.size())
1514 return error("Invalid TYPE table");
1515
1516 // Check to see if this was forward referenced, if so fill in the temp.
1517 StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]);
1518 if (Res) {
1519 Res->setName(TypeName);
1520 TypeList[NumRecords] = nullptr;
1521 } else // Otherwise, create a new struct.
1522 Res = createIdentifiedStructType(Context, TypeName);
1523 TypeName.clear();
1524
1525 SmallVector<Type*, 8> EltTys;
1526 for (unsigned i = 1, e = Record.size(); i != e; ++i) {
1527 if (Type *T = getTypeByID(Record[i]))
1528 EltTys.push_back(T);
1529 else
1530 break;
1531 }
1532 if (EltTys.size() != Record.size()-1)
1533 return error("Invalid record");
1534 Res->setBody(EltTys, Record[0]);
1535 ResultTy = Res;
1536 break;
1537 }
1538 case bitc::TYPE_CODE_OPAQUE: { // OPAQUE: []
1539 if (Record.size() != 1)
1540 return error("Invalid record");
1541
1542 if (NumRecords >= TypeList.size())
1543 return error("Invalid TYPE table");
1544
1545 // Check to see if this was forward referenced, if so fill in the temp.
1546 StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]);
1547 if (Res) {
1548 Res->setName(TypeName);
1549 TypeList[NumRecords] = nullptr;
1550 } else // Otherwise, create a new struct with no body.
1551 Res = createIdentifiedStructType(Context, TypeName);
1552 TypeName.clear();
1553 ResultTy = Res;
1554 break;
1555 }
1556 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty]
1557 if (Record.size() < 2)
1558 return error("Invalid record");
1559 ResultTy = getTypeByID(Record[1]);
1560 if (!ResultTy || !ArrayType::isValidElementType(ResultTy))
1561 return error("Invalid type");
1562 ResultTy = ArrayType::get(ResultTy, Record[0]);
1563 break;
1564 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty]
1565 if (Record.size() < 2)
1566 return error("Invalid record");
1567 if (Record[0] == 0)
1568 return error("Invalid vector length");
1569 ResultTy = getTypeByID(Record[1]);
1570 if (!ResultTy || !StructType::isValidElementType(ResultTy))
1571 return error("Invalid type");
1572 ResultTy = VectorType::get(ResultTy, Record[0]);
1573 break;
1574 }
1575
1576 if (NumRecords >= TypeList.size())
1577 return error("Invalid TYPE table");
1578 if (TypeList[NumRecords])
1579 return error(
1580 "Invalid TYPE table: Only named structs can be forward referenced");
1581 assert(ResultTy && "Didn't read a type?")((ResultTy && "Didn't read a type?") ? static_cast<
void> (0) : __assert_fail ("ResultTy && \"Didn't read a type?\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1581, __PRETTY_FUNCTION__));
1582 TypeList[NumRecords++] = ResultTy;
1583 }
1584}
1585
1586std::error_code BitcodeReader::parseValueSymbolTable() {
1587 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID))
1588 return error("Invalid record");
1589
1590 SmallVector<uint64_t, 64> Record;
1591
1592 Triple TT(TheModule->getTargetTriple());
1593
1594 // Read all the records for this value table.
1595 SmallString<128> ValueName;
1596 while (1) {
1597 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
1598
1599 switch (Entry.Kind) {
1600 case BitstreamEntry::SubBlock: // Handled for us already.
1601 case BitstreamEntry::Error:
1602 return error("Malformed block");
1603 case BitstreamEntry::EndBlock:
1604 return std::error_code();
1605 case BitstreamEntry::Record:
1606 // The interesting case.
1607 break;
1608 }
1609
1610 // Read a record.
1611 Record.clear();
1612 switch (Stream.readRecord(Entry.ID, Record)) {
1613 default: // Default behavior: unknown type.
1614 break;
1615 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N]
1616 if (convertToString(Record, 1, ValueName))
1617 return error("Invalid record");
1618 unsigned ValueID = Record[0];
1619 if (ValueID >= ValueList.size() || !ValueList[ValueID])
1620 return error("Invalid record");
1621 Value *V = ValueList[ValueID];
1622
1623 V->setName(StringRef(ValueName.data(), ValueName.size()));
1624 if (auto *GO = dyn_cast<GlobalObject>(V)) {
1625 if (GO->getComdat() == reinterpret_cast<Comdat *>(1)) {
1626 if (TT.isOSBinFormatMachO())
1627 GO->setComdat(nullptr);
1628 else
1629 GO->setComdat(TheModule->getOrInsertComdat(V->getName()));
1630 }
1631 }
1632 ValueName.clear();
1633 break;
1634 }
1635 case bitc::VST_CODE_BBENTRY: {
1636 if (convertToString(Record, 1, ValueName))
1637 return error("Invalid record");
1638 BasicBlock *BB = getBasicBlock(Record[0]);
1639 if (!BB)
1640 return error("Invalid record");
1641
1642 BB->setName(StringRef(ValueName.data(), ValueName.size()));
1643 ValueName.clear();
1644 break;
1645 }
1646 }
1647 }
1648}
1649
1650static int64_t unrotateSign(uint64_t U) { return U & 1 ? ~(U >> 1) : U >> 1; }
1651
1652std::error_code BitcodeReader::parseMetadata() {
1653 IsMetadataMaterialized = true;
1654 unsigned NextMDValueNo = MDValueList.size();
1655
1656 if (Stream.EnterSubBlock(bitc::METADATA_BLOCK_ID))
1657 return error("Invalid record");
1658
1659 SmallVector<uint64_t, 64> Record;
1660
1661 auto getMD =
1662 [&](unsigned ID) -> Metadata *{ return MDValueList.getValueFwdRef(ID); };
1663 auto getMDOrNull = [&](unsigned ID) -> Metadata *{
1664 if (ID)
1665 return getMD(ID - 1);
1666 return nullptr;
1667 };
1668 auto getMDString = [&](unsigned ID) -> MDString *{
1669 // This requires that the ID is not really a forward reference. In
1670 // particular, the MDString must already have been resolved.
1671 return cast_or_null<MDString>(getMDOrNull(ID));
1672 };
1673
1674#define GET_OR_DISTINCT(CLASS, DISTINCT, ARGS) \
1675 (DISTINCT ? CLASS::getDistinct ARGS : CLASS::get ARGS)
1676
1677 // Read all the records.
1678 while (1) {
1679 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
1680
1681 switch (Entry.Kind) {
1682 case BitstreamEntry::SubBlock: // Handled for us already.
1683 case BitstreamEntry::Error:
1684 return error("Malformed block");
1685 case BitstreamEntry::EndBlock:
1686 MDValueList.tryToResolveCycles();
1687 return std::error_code();
1688 case BitstreamEntry::Record:
1689 // The interesting case.
1690 break;
1691 }
1692
1693 // Read a record.
1694 Record.clear();
1695 unsigned Code = Stream.readRecord(Entry.ID, Record);
1696 bool IsDistinct = false;
1697 switch (Code) {
1698 default: // Default behavior: ignore.
1699 break;
1700 case bitc::METADATA_NAME: {
1701 // Read name of the named metadata.
1702 SmallString<8> Name(Record.begin(), Record.end());
1703 Record.clear();
1704 Code = Stream.ReadCode();
1705
1706 unsigned NextBitCode = Stream.readRecord(Code, Record);
1707 if (NextBitCode != bitc::METADATA_NAMED_NODE)
1708 return error("METADATA_NAME not followed by METADATA_NAMED_NODE");
1709
1710 // Read named metadata elements.
1711 unsigned Size = Record.size();
1712 NamedMDNode *NMD = TheModule->getOrInsertNamedMetadata(Name);
1713 for (unsigned i = 0; i != Size; ++i) {
1714 MDNode *MD = dyn_cast_or_null<MDNode>(MDValueList.getValueFwdRef(Record[i]));
1715 if (!MD)
1716 return error("Invalid record");
1717 NMD->addOperand(MD);
1718 }
1719 break;
1720 }
1721 case bitc::METADATA_OLD_FN_NODE: {
1722 // FIXME: Remove in 4.0.
1723 // This is a LocalAsMetadata record, the only type of function-local
1724 // metadata.
1725 if (Record.size() % 2 == 1)
1726 return error("Invalid record");
1727
1728 // If this isn't a LocalAsMetadata record, we're dropping it. This used
1729 // to be legal, but there's no upgrade path.
1730 auto dropRecord = [&] {
1731 MDValueList.assignValue(MDNode::get(Context, None), NextMDValueNo++);
1732 };
1733 if (Record.size() != 2) {
1734 dropRecord();
1735 break;
1736 }
1737
1738 Type *Ty = getTypeByID(Record[0]);
1739 if (Ty->isMetadataTy() || Ty->isVoidTy()) {
1740 dropRecord();
1741 break;
1742 }
1743
1744 MDValueList.assignValue(
1745 LocalAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
1746 NextMDValueNo++);
1747 break;
1748 }
1749 case bitc::METADATA_OLD_NODE: {
1750 // FIXME: Remove in 4.0.
1751 if (Record.size() % 2 == 1)
1752 return error("Invalid record");
1753
1754 unsigned Size = Record.size();
1755 SmallVector<Metadata *, 8> Elts;
1756 for (unsigned i = 0; i != Size; i += 2) {
1757 Type *Ty = getTypeByID(Record[i]);
1758 if (!Ty)
1759 return error("Invalid record");
1760 if (Ty->isMetadataTy())
1761 Elts.push_back(MDValueList.getValueFwdRef(Record[i+1]));
1762 else if (!Ty->isVoidTy()) {
1763 auto *MD =
1764 ValueAsMetadata::get(ValueList.getValueFwdRef(Record[i + 1], Ty));
1765 assert(isa<ConstantAsMetadata>(MD) &&((isa<ConstantAsMetadata>(MD) && "Expected non-function-local metadata"
) ? static_cast<void> (0) : __assert_fail ("isa<ConstantAsMetadata>(MD) && \"Expected non-function-local metadata\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1766, __PRETTY_FUNCTION__))
1766 "Expected non-function-local metadata")((isa<ConstantAsMetadata>(MD) && "Expected non-function-local metadata"
) ? static_cast<void> (0) : __assert_fail ("isa<ConstantAsMetadata>(MD) && \"Expected non-function-local metadata\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 1766, __PRETTY_FUNCTION__));
1767 Elts.push_back(MD);
1768 } else
1769 Elts.push_back(nullptr);
1770 }
1771 MDValueList.assignValue(MDNode::get(Context, Elts), NextMDValueNo++);
1772 break;
1773 }
1774 case bitc::METADATA_VALUE: {
1775 if (Record.size() != 2)
1776 return error("Invalid record");
1777
1778 Type *Ty = getTypeByID(Record[0]);
1779 if (Ty->isMetadataTy() || Ty->isVoidTy())
1780 return error("Invalid record");
1781
1782 MDValueList.assignValue(
1783 ValueAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
1784 NextMDValueNo++);
1785 break;
1786 }
1787 case bitc::METADATA_DISTINCT_NODE:
1788 IsDistinct = true;
1789 // fallthrough...
1790 case bitc::METADATA_NODE: {
1791 SmallVector<Metadata *, 8> Elts;
1792 Elts.reserve(Record.size());
1793 for (unsigned ID : Record)
1794 Elts.push_back(ID ? MDValueList.getValueFwdRef(ID - 1) : nullptr);
1795 MDValueList.assignValue(IsDistinct ? MDNode::getDistinct(Context, Elts)
1796 : MDNode::get(Context, Elts),
1797 NextMDValueNo++);
1798 break;
1799 }
1800 case bitc::METADATA_LOCATION: {
1801 if (Record.size() != 5)
1802 return error("Invalid record");
1803
1804 unsigned Line = Record[1];
1805 unsigned Column = Record[2];
1806 MDNode *Scope = cast<MDNode>(MDValueList.getValueFwdRef(Record[3]));
1807 Metadata *InlinedAt =
1808 Record[4] ? MDValueList.getValueFwdRef(Record[4] - 1) : nullptr;
1809 MDValueList.assignValue(
1810 GET_OR_DISTINCT(DILocation, Record[0],
1811 (Context, Line, Column, Scope, InlinedAt)),
1812 NextMDValueNo++);
1813 break;
1814 }
1815 case bitc::METADATA_GENERIC_DEBUG: {
1816 if (Record.size() < 4)
1817 return error("Invalid record");
1818
1819 unsigned Tag = Record[1];
1820 unsigned Version = Record[2];
1821
1822 if (Tag >= 1u << 16 || Version != 0)
1823 return error("Invalid record");
1824
1825 auto *Header = getMDString(Record[3]);
1826 SmallVector<Metadata *, 8> DwarfOps;
1827 for (unsigned I = 4, E = Record.size(); I != E; ++I)
1828 DwarfOps.push_back(Record[I] ? MDValueList.getValueFwdRef(Record[I] - 1)
1829 : nullptr);
1830 MDValueList.assignValue(GET_OR_DISTINCT(GenericDINode, Record[0],
1831 (Context, Tag, Header, DwarfOps)),
1832 NextMDValueNo++);
1833 break;
1834 }
1835 case bitc::METADATA_SUBRANGE: {
1836 if (Record.size() != 3)
1837 return error("Invalid record");
1838
1839 MDValueList.assignValue(
1840 GET_OR_DISTINCT(DISubrange, Record[0],
1841 (Context, Record[1], unrotateSign(Record[2]))),
1842 NextMDValueNo++);
1843 break;
1844 }
1845 case bitc::METADATA_ENUMERATOR: {
1846 if (Record.size() != 3)
1847 return error("Invalid record");
1848
1849 MDValueList.assignValue(GET_OR_DISTINCT(DIEnumerator, Record[0],
1850 (Context, unrotateSign(Record[1]),
1851 getMDString(Record[2]))),
1852 NextMDValueNo++);
1853 break;
1854 }
1855 case bitc::METADATA_BASIC_TYPE: {
1856 if (Record.size() != 6)
1857 return error("Invalid record");
1858
1859 MDValueList.assignValue(
1860 GET_OR_DISTINCT(DIBasicType, Record[0],
1861 (Context, Record[1], getMDString(Record[2]),
1862 Record[3], Record[4], Record[5])),
1863 NextMDValueNo++);
1864 break;
1865 }
1866 case bitc::METADATA_DERIVED_TYPE: {
1867 if (Record.size() != 12)
1868 return error("Invalid record");
1869
1870 MDValueList.assignValue(
1871 GET_OR_DISTINCT(DIDerivedType, Record[0],
1872 (Context, Record[1], getMDString(Record[2]),
1873 getMDOrNull(Record[3]), Record[4],
1874 getMDOrNull(Record[5]), getMDOrNull(Record[6]),
1875 Record[7], Record[8], Record[9], Record[10],
1876 getMDOrNull(Record[11]))),
1877 NextMDValueNo++);
1878 break;
1879 }
1880 case bitc::METADATA_COMPOSITE_TYPE: {
1881 if (Record.size() != 16)
1882 return error("Invalid record");
1883
1884 MDValueList.assignValue(
1885 GET_OR_DISTINCT(DICompositeType, Record[0],
1886 (Context, Record[1], getMDString(Record[2]),
1887 getMDOrNull(Record[3]), Record[4],
1888 getMDOrNull(Record[5]), getMDOrNull(Record[6]),
1889 Record[7], Record[8], Record[9], Record[10],
1890 getMDOrNull(Record[11]), Record[12],
1891 getMDOrNull(Record[13]), getMDOrNull(Record[14]),
1892 getMDString(Record[15]))),
1893 NextMDValueNo++);
1894 break;
1895 }
1896 case bitc::METADATA_SUBROUTINE_TYPE: {
1897 if (Record.size() != 3)
1898 return error("Invalid record");
1899
1900 MDValueList.assignValue(
1901 GET_OR_DISTINCT(DISubroutineType, Record[0],
1902 (Context, Record[1], getMDOrNull(Record[2]))),
1903 NextMDValueNo++);
1904 break;
1905 }
1906
1907 case bitc::METADATA_MODULE: {
1908 if (Record.size() != 6)
1909 return error("Invalid record");
1910
1911 MDValueList.assignValue(
1912 GET_OR_DISTINCT(DIModule, Record[0],
1913 (Context, getMDOrNull(Record[1]),
1914 getMDString(Record[2]), getMDString(Record[3]),
1915 getMDString(Record[4]), getMDString(Record[5]))),
1916 NextMDValueNo++);
1917 break;
1918 }
1919
1920 case bitc::METADATA_FILE: {
1921 if (Record.size() != 3)
1922 return error("Invalid record");
1923
1924 MDValueList.assignValue(
1925 GET_OR_DISTINCT(DIFile, Record[0], (Context, getMDString(Record[1]),
1926 getMDString(Record[2]))),
1927 NextMDValueNo++);
1928 break;
1929 }
1930 case bitc::METADATA_COMPILE_UNIT: {
1931 if (Record.size() < 14 || Record.size() > 15)
1932 return error("Invalid record");
1933
1934 // Ignore Record[1], which indicates whether this compile unit is
1935 // distinct. It's always distinct.
1936 MDValueList.assignValue(
1937 DICompileUnit::getDistinct(
1938 Context, Record[1], getMDOrNull(Record[2]),
1939 getMDString(Record[3]), Record[4], getMDString(Record[5]),
1940 Record[6], getMDString(Record[7]), Record[8],
1941 getMDOrNull(Record[9]), getMDOrNull(Record[10]),
1942 getMDOrNull(Record[11]), getMDOrNull(Record[12]),
1943 getMDOrNull(Record[13]), Record.size() == 14 ? 0 : Record[14]),
1944 NextMDValueNo++);
1945 break;
1946 }
1947 case bitc::METADATA_SUBPROGRAM: {
1948 if (Record.size() != 19)
1949 return error("Invalid record");
1950
1951 MDValueList.assignValue(
1952 GET_OR_DISTINCT(
1953 DISubprogram,
1954 Record[0] || Record[8], // All definitions should be distinct.
1955 (Context, getMDOrNull(Record[1]), getMDString(Record[2]),
1956 getMDString(Record[3]), getMDOrNull(Record[4]), Record[5],
1957 getMDOrNull(Record[6]), Record[7], Record[8], Record[9],
1958 getMDOrNull(Record[10]), Record[11], Record[12], Record[13],
1959 Record[14], getMDOrNull(Record[15]), getMDOrNull(Record[16]),
1960 getMDOrNull(Record[17]), getMDOrNull(Record[18]))),
1961 NextMDValueNo++);
1962 break;
1963 }
1964 case bitc::METADATA_LEXICAL_BLOCK: {
1965 if (Record.size() != 5)
1966 return error("Invalid record");
1967
1968 MDValueList.assignValue(
1969 GET_OR_DISTINCT(DILexicalBlock, Record[0],
1970 (Context, getMDOrNull(Record[1]),
1971 getMDOrNull(Record[2]), Record[3], Record[4])),
1972 NextMDValueNo++);
1973 break;
1974 }
1975 case bitc::METADATA_LEXICAL_BLOCK_FILE: {
1976 if (Record.size() != 4)
1977 return error("Invalid record");
1978
1979 MDValueList.assignValue(
1980 GET_OR_DISTINCT(DILexicalBlockFile, Record[0],
1981 (Context, getMDOrNull(Record[1]),
1982 getMDOrNull(Record[2]), Record[3])),
1983 NextMDValueNo++);
1984 break;
1985 }
1986 case bitc::METADATA_NAMESPACE: {
1987 if (Record.size() != 5)
1988 return error("Invalid record");
1989
1990 MDValueList.assignValue(
1991 GET_OR_DISTINCT(DINamespace, Record[0],
1992 (Context, getMDOrNull(Record[1]),
1993 getMDOrNull(Record[2]), getMDString(Record[3]),
1994 Record[4])),
1995 NextMDValueNo++);
1996 break;
1997 }
1998 case bitc::METADATA_TEMPLATE_TYPE: {
1999 if (Record.size() != 3)
2000 return error("Invalid record");
2001
2002 MDValueList.assignValue(GET_OR_DISTINCT(DITemplateTypeParameter,
2003 Record[0],
2004 (Context, getMDString(Record[1]),
2005 getMDOrNull(Record[2]))),
2006 NextMDValueNo++);
2007 break;
2008 }
2009 case bitc::METADATA_TEMPLATE_VALUE: {
2010 if (Record.size() != 5)
2011 return error("Invalid record");
2012
2013 MDValueList.assignValue(
2014 GET_OR_DISTINCT(DITemplateValueParameter, Record[0],
2015 (Context, Record[1], getMDString(Record[2]),
2016 getMDOrNull(Record[3]), getMDOrNull(Record[4]))),
2017 NextMDValueNo++);
2018 break;
2019 }
2020 case bitc::METADATA_GLOBAL_VAR: {
2021 if (Record.size() != 11)
2022 return error("Invalid record");
2023
2024 MDValueList.assignValue(
2025 GET_OR_DISTINCT(DIGlobalVariable, Record[0],
2026 (Context, getMDOrNull(Record[1]),
2027 getMDString(Record[2]), getMDString(Record[3]),
2028 getMDOrNull(Record[4]), Record[5],
2029 getMDOrNull(Record[6]), Record[7], Record[8],
2030 getMDOrNull(Record[9]), getMDOrNull(Record[10]))),
2031 NextMDValueNo++);
2032 break;
2033 }
2034 case bitc::METADATA_LOCAL_VAR: {
2035 // 10th field is for the obseleted 'inlinedAt:' field.
2036 if (Record.size() < 8 || Record.size() > 10)
2037 return error("Invalid record");
2038
2039 // 2nd field used to be an artificial tag, either DW_TAG_auto_variable or
2040 // DW_TAG_arg_variable.
2041 bool HasTag = Record.size() > 8;
2042 MDValueList.assignValue(
2043 GET_OR_DISTINCT(DILocalVariable, Record[0],
2044 (Context, getMDOrNull(Record[1 + HasTag]),
2045 getMDString(Record[2 + HasTag]),
2046 getMDOrNull(Record[3 + HasTag]), Record[4 + HasTag],
2047 getMDOrNull(Record[5 + HasTag]), Record[6 + HasTag],
2048 Record[7 + HasTag])),
2049 NextMDValueNo++);
2050 break;
2051 }
2052 case bitc::METADATA_EXPRESSION: {
2053 if (Record.size() < 1)
2054 return error("Invalid record");
2055
2056 MDValueList.assignValue(
2057 GET_OR_DISTINCT(DIExpression, Record[0],
2058 (Context, makeArrayRef(Record).slice(1))),
2059 NextMDValueNo++);
2060 break;
2061 }
2062 case bitc::METADATA_OBJC_PROPERTY: {
2063 if (Record.size() != 8)
2064 return error("Invalid record");
2065
2066 MDValueList.assignValue(
2067 GET_OR_DISTINCT(DIObjCProperty, Record[0],
2068 (Context, getMDString(Record[1]),
2069 getMDOrNull(Record[2]), Record[3],
2070 getMDString(Record[4]), getMDString(Record[5]),
2071 Record[6], getMDOrNull(Record[7]))),
2072 NextMDValueNo++);
2073 break;
2074 }
2075 case bitc::METADATA_IMPORTED_ENTITY: {
2076 if (Record.size() != 6)
2077 return error("Invalid record");
2078
2079 MDValueList.assignValue(
2080 GET_OR_DISTINCT(DIImportedEntity, Record[0],
2081 (Context, Record[1], getMDOrNull(Record[2]),
2082 getMDOrNull(Record[3]), Record[4],
2083 getMDString(Record[5]))),
2084 NextMDValueNo++);
2085 break;
2086 }
2087 case bitc::METADATA_STRING: {
2088 std::string String(Record.begin(), Record.end());
2089 llvm::UpgradeMDStringConstant(String);
2090 Metadata *MD = MDString::get(Context, String);
2091 MDValueList.assignValue(MD, NextMDValueNo++);
2092 break;
2093 }
2094 case bitc::METADATA_KIND: {
2095 if (Record.size() < 2)
2096 return error("Invalid record");
2097
2098 unsigned Kind = Record[0];
2099 SmallString<8> Name(Record.begin()+1, Record.end());
2100
2101 unsigned NewKind = TheModule->getMDKindID(Name.str());
2102 if (!MDKindMap.insert(std::make_pair(Kind, NewKind)).second)
2103 return error("Conflicting METADATA_KIND records");
2104 break;
2105 }
2106 }
2107 }
2108#undef GET_OR_DISTINCT
2109}
2110
2111/// Decode a signed value stored with the sign bit in the LSB for dense VBR
2112/// encoding.
2113uint64_t BitcodeReader::decodeSignRotatedValue(uint64_t V) {
2114 if ((V & 1) == 0)
2115 return V >> 1;
2116 if (V != 1)
2117 return -(V >> 1);
2118 // There is no such thing as -0 with integers. "-0" really means MININT.
2119 return 1ULL << 63;
2120}
2121
2122/// Resolve all of the initializers for global values and aliases that we can.
2123std::error_code BitcodeReader::resolveGlobalAndAliasInits() {
2124 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist;
2125 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist;
2126 std::vector<std::pair<Function*, unsigned> > FunctionPrefixWorklist;
2127 std::vector<std::pair<Function*, unsigned> > FunctionPrologueWorklist;
2128 std::vector<std::pair<Function*, unsigned> > FunctionPersonalityFnWorklist;
2129
2130 GlobalInitWorklist.swap(GlobalInits);
2131 AliasInitWorklist.swap(AliasInits);
2132 FunctionPrefixWorklist.swap(FunctionPrefixes);
2133 FunctionPrologueWorklist.swap(FunctionPrologues);
2134 FunctionPersonalityFnWorklist.swap(FunctionPersonalityFns);
2135
2136 while (!GlobalInitWorklist.empty()) {
2137 unsigned ValID = GlobalInitWorklist.back().second;
2138 if (ValID >= ValueList.size()) {
2139 // Not ready to resolve this yet, it requires something later in the file.
2140 GlobalInits.push_back(GlobalInitWorklist.back());
2141 } else {
2142 if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
2143 GlobalInitWorklist.back().first->setInitializer(C);
2144 else
2145 return error("Expected a constant");
2146 }
2147 GlobalInitWorklist.pop_back();
2148 }
2149
2150 while (!AliasInitWorklist.empty()) {
2151 unsigned ValID = AliasInitWorklist.back().second;
2152 if (ValID >= ValueList.size()) {
2153 AliasInits.push_back(AliasInitWorklist.back());
2154 } else {
2155 Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]);
2156 if (!C)
2157 return error("Expected a constant");
2158 GlobalAlias *Alias = AliasInitWorklist.back().first;
2159 if (C->getType() != Alias->getType())
2160 return error("Alias and aliasee types don't match");
2161 Alias->setAliasee(C);
2162 }
2163 AliasInitWorklist.pop_back();
2164 }
2165
2166 while (!FunctionPrefixWorklist.empty()) {
2167 unsigned ValID = FunctionPrefixWorklist.back().second;
2168 if (ValID >= ValueList.size()) {
2169 FunctionPrefixes.push_back(FunctionPrefixWorklist.back());
2170 } else {
2171 if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
2172 FunctionPrefixWorklist.back().first->setPrefixData(C);
2173 else
2174 return error("Expected a constant");
2175 }
2176 FunctionPrefixWorklist.pop_back();
2177 }
2178
2179 while (!FunctionPrologueWorklist.empty()) {
2180 unsigned ValID = FunctionPrologueWorklist.back().second;
2181 if (ValID >= ValueList.size()) {
2182 FunctionPrologues.push_back(FunctionPrologueWorklist.back());
2183 } else {
2184 if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
2185 FunctionPrologueWorklist.back().first->setPrologueData(C);
2186 else
2187 return error("Expected a constant");
2188 }
2189 FunctionPrologueWorklist.pop_back();
2190 }
2191
2192 while (!FunctionPersonalityFnWorklist.empty()) {
2193 unsigned ValID = FunctionPersonalityFnWorklist.back().second;
2194 if (ValID >= ValueList.size()) {
2195 FunctionPersonalityFns.push_back(FunctionPersonalityFnWorklist.back());
2196 } else {
2197 if (Constant *C = dyn_cast_or_null<Constant>(ValueList[ValID]))
2198 FunctionPersonalityFnWorklist.back().first->setPersonalityFn(C);
2199 else
2200 return error("Expected a constant");
2201 }
2202 FunctionPersonalityFnWorklist.pop_back();
2203 }
2204
2205 return std::error_code();
2206}
2207
2208static APInt readWideAPInt(ArrayRef<uint64_t> Vals, unsigned TypeBits) {
2209 SmallVector<uint64_t, 8> Words(Vals.size());
2210 std::transform(Vals.begin(), Vals.end(), Words.begin(),
2211 BitcodeReader::decodeSignRotatedValue);
2212
2213 return APInt(TypeBits, Words);
2214}
2215
2216std::error_code BitcodeReader::parseConstants() {
2217 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID))
2218 return error("Invalid record");
2219
2220 SmallVector<uint64_t, 64> Record;
2221
2222 // Read all the records for this value table.
2223 Type *CurTy = Type::getInt32Ty(Context);
2224 unsigned NextCstNo = ValueList.size();
2225 while (1) {
2226 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
2227
2228 switch (Entry.Kind) {
2229 case BitstreamEntry::SubBlock: // Handled for us already.
2230 case BitstreamEntry::Error:
2231 return error("Malformed block");
2232 case BitstreamEntry::EndBlock:
2233 if (NextCstNo != ValueList.size())
2234 return error("Invalid ronstant reference");
2235
2236 // Once all the constants have been read, go through and resolve forward
2237 // references.
2238 ValueList.resolveConstantForwardRefs();
2239 return std::error_code();
2240 case BitstreamEntry::Record:
2241 // The interesting case.
2242 break;
2243 }
2244
2245 // Read a record.
2246 Record.clear();
2247 Value *V = nullptr;
2248 unsigned BitCode = Stream.readRecord(Entry.ID, Record);
2249 switch (BitCode) {
2250 default: // Default behavior: unknown constant
2251 case bitc::CST_CODE_UNDEF: // UNDEF
2252 V = UndefValue::get(CurTy);
2253 break;
2254 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid]
2255 if (Record.empty())
2256 return error("Invalid record");
2257 if (Record[0] >= TypeList.size() || !TypeList[Record[0]])
2258 return error("Invalid record");
2259 CurTy = TypeList[Record[0]];
2260 continue; // Skip the ValueList manipulation.
2261 case bitc::CST_CODE_NULL: // NULL
2262 V = Constant::getNullValue(CurTy);
2263 break;
2264 case bitc::CST_CODE_INTEGER: // INTEGER: [intval]
2265 if (!CurTy->isIntegerTy() || Record.empty())
2266 return error("Invalid record");
2267 V = ConstantInt::get(CurTy, decodeSignRotatedValue(Record[0]));
2268 break;
2269 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval]
2270 if (!CurTy->isIntegerTy() || Record.empty())
2271 return error("Invalid record");
2272
2273 APInt VInt =
2274 readWideAPInt(Record, cast<IntegerType>(CurTy)->getBitWidth());
2275 V = ConstantInt::get(Context, VInt);
2276
2277 break;
2278 }
2279 case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval]
2280 if (Record.empty())
2281 return error("Invalid record");
2282 if (CurTy->isHalfTy())
2283 V = ConstantFP::get(Context, APFloat(APFloat::IEEEhalf,
2284 APInt(16, (uint16_t)Record[0])));
2285 else if (CurTy->isFloatTy())
2286 V = ConstantFP::get(Context, APFloat(APFloat::IEEEsingle,
2287 APInt(32, (uint32_t)Record[0])));
2288 else if (CurTy->isDoubleTy())
2289 V = ConstantFP::get(Context, APFloat(APFloat::IEEEdouble,
2290 APInt(64, Record[0])));
2291 else if (CurTy->isX86_FP80Ty()) {
2292 // Bits are not stored the same way as a normal i80 APInt, compensate.
2293 uint64_t Rearrange[2];
2294 Rearrange[0] = (Record[1] & 0xffffLL) | (Record[0] << 16);
2295 Rearrange[1] = Record[0] >> 48;
2296 V = ConstantFP::get(Context, APFloat(APFloat::x87DoubleExtended,
2297 APInt(80, Rearrange)));
2298 } else if (CurTy->isFP128Ty())
2299 V = ConstantFP::get(Context, APFloat(APFloat::IEEEquad,
2300 APInt(128, Record)));
2301 else if (CurTy->isPPC_FP128Ty())
2302 V = ConstantFP::get(Context, APFloat(APFloat::PPCDoubleDouble,
2303 APInt(128, Record)));
2304 else
2305 V = UndefValue::get(CurTy);
2306 break;
2307 }
2308
2309 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number]
2310 if (Record.empty())
2311 return error("Invalid record");
2312
2313 unsigned Size = Record.size();
2314 SmallVector<Constant*, 16> Elts;
2315
2316 if (StructType *STy = dyn_cast<StructType>(CurTy)) {
2317 for (unsigned i = 0; i != Size; ++i)
2318 Elts.push_back(ValueList.getConstantFwdRef(Record[i],
2319 STy->getElementType(i)));
2320 V = ConstantStruct::get(STy, Elts);
2321 } else if (ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) {
2322 Type *EltTy = ATy->getElementType();
2323 for (unsigned i = 0; i != Size; ++i)
2324 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
2325 V = ConstantArray::get(ATy, Elts);
2326 } else if (VectorType *VTy = dyn_cast<VectorType>(CurTy)) {
2327 Type *EltTy = VTy->getElementType();
2328 for (unsigned i = 0; i != Size; ++i)
2329 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy));
2330 V = ConstantVector::get(Elts);
2331 } else {
2332 V = UndefValue::get(CurTy);
2333 }
2334 break;
2335 }
2336 case bitc::CST_CODE_STRING: // STRING: [values]
2337 case bitc::CST_CODE_CSTRING: { // CSTRING: [values]
2338 if (Record.empty())
2339 return error("Invalid record");
2340
2341 SmallString<16> Elts(Record.begin(), Record.end());
2342 V = ConstantDataArray::getString(Context, Elts,
2343 BitCode == bitc::CST_CODE_CSTRING);
2344 break;
2345 }
2346 case bitc::CST_CODE_DATA: {// DATA: [n x value]
2347 if (Record.empty())
2348 return error("Invalid record");
2349
2350 Type *EltTy = cast<SequentialType>(CurTy)->getElementType();
2351 unsigned Size = Record.size();
2352
2353 if (EltTy->isIntegerTy(8)) {
2354 SmallVector<uint8_t, 16> Elts(Record.begin(), Record.end());
2355 if (isa<VectorType>(CurTy))
2356 V = ConstantDataVector::get(Context, Elts);
2357 else
2358 V = ConstantDataArray::get(Context, Elts);
2359 } else if (EltTy->isIntegerTy(16)) {
2360 SmallVector<uint16_t, 16> Elts(Record.begin(), Record.end());
2361 if (isa<VectorType>(CurTy))
2362 V = ConstantDataVector::get(Context, Elts);
2363 else
2364 V = ConstantDataArray::get(Context, Elts);
2365 } else if (EltTy->isIntegerTy(32)) {
2366 SmallVector<uint32_t, 16> Elts(Record.begin(), Record.end());
2367 if (isa<VectorType>(CurTy))
2368 V = ConstantDataVector::get(Context, Elts);
2369 else
2370 V = ConstantDataArray::get(Context, Elts);
2371 } else if (EltTy->isIntegerTy(64)) {
2372 SmallVector<uint64_t, 16> Elts(Record.begin(), Record.end());
2373 if (isa<VectorType>(CurTy))
2374 V = ConstantDataVector::get(Context, Elts);
2375 else
2376 V = ConstantDataArray::get(Context, Elts);
2377 } else if (EltTy->isFloatTy()) {
2378 SmallVector<float, 16> Elts(Size);
2379 std::transform(Record.begin(), Record.end(), Elts.begin(), BitsToFloat);
2380 if (isa<VectorType>(CurTy))
2381 V = ConstantDataVector::get(Context, Elts);
2382 else
2383 V = ConstantDataArray::get(Context, Elts);
2384 } else if (EltTy->isDoubleTy()) {
2385 SmallVector<double, 16> Elts(Size);
2386 std::transform(Record.begin(), Record.end(), Elts.begin(),
2387 BitsToDouble);
2388 if (isa<VectorType>(CurTy))
2389 V = ConstantDataVector::get(Context, Elts);
2390 else
2391 V = ConstantDataArray::get(Context, Elts);
2392 } else {
2393 return error("Invalid type for value");
2394 }
2395 break;
2396 }
2397
2398 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval]
2399 if (Record.size() < 3)
2400 return error("Invalid record");
2401 int Opc = getDecodedBinaryOpcode(Record[0], CurTy);
2402 if (Opc < 0) {
2403 V = UndefValue::get(CurTy); // Unknown binop.
2404 } else {
2405 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy);
2406 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy);
2407 unsigned Flags = 0;
2408 if (Record.size() >= 4) {
2409 if (Opc == Instruction::Add ||
2410 Opc == Instruction::Sub ||
2411 Opc == Instruction::Mul ||
2412 Opc == Instruction::Shl) {
2413 if (Record[3] & (1 << bitc::OBO_NO_SIGNED_WRAP))
2414 Flags |= OverflowingBinaryOperator::NoSignedWrap;
2415 if (Record[3] & (1 << bitc::OBO_NO_UNSIGNED_WRAP))
2416 Flags |= OverflowingBinaryOperator::NoUnsignedWrap;
2417 } else if (Opc == Instruction::SDiv ||
2418 Opc == Instruction::UDiv ||
2419 Opc == Instruction::LShr ||
2420 Opc == Instruction::AShr) {
2421 if (Record[3] & (1 << bitc::PEO_EXACT))
2422 Flags |= SDivOperator::IsExact;
2423 }
2424 }
2425 V = ConstantExpr::get(Opc, LHS, RHS, Flags);
2426 }
2427 break;
2428 }
2429 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval]
2430 if (Record.size() < 3)
2431 return error("Invalid record");
2432 int Opc = getDecodedCastOpcode(Record[0]);
2433 if (Opc < 0) {
2434 V = UndefValue::get(CurTy); // Unknown cast.
2435 } else {
2436 Type *OpTy = getTypeByID(Record[1]);
2437 if (!OpTy)
2438 return error("Invalid record");
2439 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy);
2440 V = UpgradeBitCastExpr(Opc, Op, CurTy);
2441 if (!V) V = ConstantExpr::getCast(Opc, Op, CurTy);
2442 }
2443 break;
2444 }
2445 case bitc::CST_CODE_CE_INBOUNDS_GEP:
2446 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands]
2447 unsigned OpNum = 0;
2448 Type *PointeeType = nullptr;
2449 if (Record.size() % 2)
2450 PointeeType = getTypeByID(Record[OpNum++]);
2451 SmallVector<Constant*, 16> Elts;
2452 while (OpNum != Record.size()) {
2453 Type *ElTy = getTypeByID(Record[OpNum++]);
2454 if (!ElTy)
2455 return error("Invalid record");
2456 Elts.push_back(ValueList.getConstantFwdRef(Record[OpNum++], ElTy));
2457 }
2458
2459 if (PointeeType &&
2460 PointeeType !=
2461 cast<SequentialType>(Elts[0]->getType()->getScalarType())
2462 ->getElementType())
2463 return error("Explicit gep operator type does not match pointee type "
2464 "of pointer operand");
2465
2466 ArrayRef<Constant *> Indices(Elts.begin() + 1, Elts.end());
2467 V = ConstantExpr::getGetElementPtr(PointeeType, Elts[0], Indices,
2468 BitCode ==
2469 bitc::CST_CODE_CE_INBOUNDS_GEP);
2470 break;
2471 }
2472 case bitc::CST_CODE_CE_SELECT: { // CE_SELECT: [opval#, opval#, opval#]
2473 if (Record.size() < 3)
2474 return error("Invalid record");
2475
2476 Type *SelectorTy = Type::getInt1Ty(Context);
2477
2478 // If CurTy is a vector of length n, then Record[0] must be a <n x i1>
2479 // vector. Otherwise, it must be a single bit.
2480 if (VectorType *VTy = dyn_cast<VectorType>(CurTy))
2481 SelectorTy = VectorType::get(Type::getInt1Ty(Context),
2482 VTy->getNumElements());
2483
2484 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0],
2485 SelectorTy),
2486 ValueList.getConstantFwdRef(Record[1],CurTy),
2487 ValueList.getConstantFwdRef(Record[2],CurTy));
2488 break;
2489 }
2490 case bitc::CST_CODE_CE_EXTRACTELT
2491 : { // CE_EXTRACTELT: [opty, opval, opty, opval]
2492 if (Record.size() < 3)
2493 return error("Invalid record");
2494 VectorType *OpTy =
2495 dyn_cast_or_null<VectorType>(getTypeByID(Record[0]));
2496 if (!OpTy)
2497 return error("Invalid record");
2498 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
2499 Constant *Op1 = nullptr;
2500 if (Record.size() == 4) {
2501 Type *IdxTy = getTypeByID(Record[2]);
2502 if (!IdxTy)
2503 return error("Invalid record");
2504 Op1 = ValueList.getConstantFwdRef(Record[3], IdxTy);
2505 } else // TODO: Remove with llvm 4.0
2506 Op1 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context));
2507 if (!Op1)
2508 return error("Invalid record");
2509 V = ConstantExpr::getExtractElement(Op0, Op1);
2510 break;
2511 }
2512 case bitc::CST_CODE_CE_INSERTELT
2513 : { // CE_INSERTELT: [opval, opval, opty, opval]
2514 VectorType *OpTy = dyn_cast<VectorType>(CurTy);
2515 if (Record.size() < 3 || !OpTy)
2516 return error("Invalid record");
2517 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
2518 Constant *Op1 = ValueList.getConstantFwdRef(Record[1],
2519 OpTy->getElementType());
2520 Constant *Op2 = nullptr;
2521 if (Record.size() == 4) {
2522 Type *IdxTy = getTypeByID(Record[2]);
2523 if (!IdxTy)
2524 return error("Invalid record");
2525 Op2 = ValueList.getConstantFwdRef(Record[3], IdxTy);
2526 } else // TODO: Remove with llvm 4.0
2527 Op2 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context));
2528 if (!Op2)
2529 return error("Invalid record");
2530 V = ConstantExpr::getInsertElement(Op0, Op1, Op2);
2531 break;
2532 }
2533 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval]
2534 VectorType *OpTy = dyn_cast<VectorType>(CurTy);
2535 if (Record.size() < 3 || !OpTy)
2536 return error("Invalid record");
2537 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy);
2538 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy);
2539 Type *ShufTy = VectorType::get(Type::getInt32Ty(Context),
2540 OpTy->getNumElements());
2541 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy);
2542 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2);
2543 break;
2544 }
2545 case bitc::CST_CODE_CE_SHUFVEC_EX: { // [opty, opval, opval, opval]
2546 VectorType *RTy = dyn_cast<VectorType>(CurTy);
2547 VectorType *OpTy =
2548 dyn_cast_or_null<VectorType>(getTypeByID(Record[0]));
2549 if (Record.size() < 4 || !RTy || !OpTy)
2550 return error("Invalid record");
2551 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
2552 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);
2553 Type *ShufTy = VectorType::get(Type::getInt32Ty(Context),
2554 RTy->getNumElements());
2555 Constant *Op2 = ValueList.getConstantFwdRef(Record[3], ShufTy);
2556 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2);
2557 break;
2558 }
2559 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred]
2560 if (Record.size() < 4)
2561 return error("Invalid record");
2562 Type *OpTy = getTypeByID(Record[0]);
2563 if (!OpTy)
2564 return error("Invalid record");
2565 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy);
2566 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy);
2567
2568 if (OpTy->isFPOrFPVectorTy())
2569 V = ConstantExpr::getFCmp(Record[3], Op0, Op1);
2570 else
2571 V = ConstantExpr::getICmp(Record[3], Op0, Op1);
2572 break;
2573 }
2574 // This maintains backward compatibility, pre-asm dialect keywords.
2575 // FIXME: Remove with the 4.0 release.
2576 case bitc::CST_CODE_INLINEASM_OLD: {
2577 if (Record.size() < 2)
2578 return error("Invalid record");
2579 std::string AsmStr, ConstrStr;
2580 bool HasSideEffects = Record[0] & 1;
2581 bool IsAlignStack = Record[0] >> 1;
2582 unsigned AsmStrSize = Record[1];
2583 if (2+AsmStrSize >= Record.size())
2584 return error("Invalid record");
2585 unsigned ConstStrSize = Record[2+AsmStrSize];
2586 if (3+AsmStrSize+ConstStrSize > Record.size())
2587 return error("Invalid record");
2588
2589 for (unsigned i = 0; i != AsmStrSize; ++i)
2590 AsmStr += (char)Record[2+i];
2591 for (unsigned i = 0; i != ConstStrSize; ++i)
2592 ConstrStr += (char)Record[3+AsmStrSize+i];
2593 PointerType *PTy = cast<PointerType>(CurTy);
2594 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
2595 AsmStr, ConstrStr, HasSideEffects, IsAlignStack);
2596 break;
2597 }
2598 // This version adds support for the asm dialect keywords (e.g.,
2599 // inteldialect).
2600 case bitc::CST_CODE_INLINEASM: {
2601 if (Record.size() < 2)
2602 return error("Invalid record");
2603 std::string AsmStr, ConstrStr;
2604 bool HasSideEffects = Record[0] & 1;
2605 bool IsAlignStack = (Record[0] >> 1) & 1;
2606 unsigned AsmDialect = Record[0] >> 2;
2607 unsigned AsmStrSize = Record[1];
2608 if (2+AsmStrSize >= Record.size())
2609 return error("Invalid record");
2610 unsigned ConstStrSize = Record[2+AsmStrSize];
2611 if (3+AsmStrSize+ConstStrSize > Record.size())
2612 return error("Invalid record");
2613
2614 for (unsigned i = 0; i != AsmStrSize; ++i)
2615 AsmStr += (char)Record[2+i];
2616 for (unsigned i = 0; i != ConstStrSize; ++i)
2617 ConstrStr += (char)Record[3+AsmStrSize+i];
2618 PointerType *PTy = cast<PointerType>(CurTy);
2619 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
2620 AsmStr, ConstrStr, HasSideEffects, IsAlignStack,
2621 InlineAsm::AsmDialect(AsmDialect));
2622 break;
2623 }
2624 case bitc::CST_CODE_BLOCKADDRESS:{
2625 if (Record.size() < 3)
2626 return error("Invalid record");
2627 Type *FnTy = getTypeByID(Record[0]);
2628 if (!FnTy)
2629 return error("Invalid record");
2630 Function *Fn =
2631 dyn_cast_or_null<Function>(ValueList.getConstantFwdRef(Record[1],FnTy));
2632 if (!Fn)
2633 return error("Invalid record");
2634
2635 // Don't let Fn get dematerialized.
2636 BlockAddressesTaken.insert(Fn);
2637
2638 // If the function is already parsed we can insert the block address right
2639 // away.
2640 BasicBlock *BB;
2641 unsigned BBID = Record[2];
2642 if (!BBID)
2643 // Invalid reference to entry block.
2644 return error("Invalid ID");
2645 if (!Fn->empty()) {
2646 Function::iterator BBI = Fn->begin(), BBE = Fn->end();
2647 for (size_t I = 0, E = BBID; I != E; ++I) {
2648 if (BBI == BBE)
2649 return error("Invalid ID");
2650 ++BBI;
2651 }
2652 BB = BBI;
2653 } else {
2654 // Otherwise insert a placeholder and remember it so it can be inserted
2655 // when the function is parsed.
2656 auto &FwdBBs = BasicBlockFwdRefs[Fn];
2657 if (FwdBBs.empty())
2658 BasicBlockFwdRefQueue.push_back(Fn);
2659 if (FwdBBs.size() < BBID + 1)
2660 FwdBBs.resize(BBID + 1);
2661 if (!FwdBBs[BBID])
2662 FwdBBs[BBID] = BasicBlock::Create(Context);
2663 BB = FwdBBs[BBID];
2664 }
2665 V = BlockAddress::get(Fn, BB);
2666 break;
2667 }
2668 }
2669
2670 if (ValueList.assignValue(V, NextCstNo))
2671 return error("Invalid forward reference");
2672 ++NextCstNo;
2673 }
2674}
2675
2676std::error_code BitcodeReader::parseUseLists() {
2677 if (Stream.EnterSubBlock(bitc::USELIST_BLOCK_ID))
2678 return error("Invalid record");
2679
2680 // Read all the records.
2681 SmallVector<uint64_t, 64> Record;
2682 while (1) {
2683 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
2684
2685 switch (Entry.Kind) {
2686 case BitstreamEntry::SubBlock: // Handled for us already.
2687 case BitstreamEntry::Error:
2688 return error("Malformed block");
2689 case BitstreamEntry::EndBlock:
2690 return std::error_code();
2691 case BitstreamEntry::Record:
2692 // The interesting case.
2693 break;
2694 }
2695
2696 // Read a use list record.
2697 Record.clear();
2698 bool IsBB = false;
2699 switch (Stream.readRecord(Entry.ID, Record)) {
2700 default: // Default behavior: unknown type.
2701 break;
2702 case bitc::USELIST_CODE_BB:
2703 IsBB = true;
2704 // fallthrough
2705 case bitc::USELIST_CODE_DEFAULT: {
2706 unsigned RecordLength = Record.size();
2707 if (RecordLength < 3)
2708 // Records should have at least an ID and two indexes.
2709 return error("Invalid record");
2710 unsigned ID = Record.back();
2711 Record.pop_back();
2712
2713 Value *V;
2714 if (IsBB) {
2715 assert(ID < FunctionBBs.size() && "Basic block not found")((ID < FunctionBBs.size() && "Basic block not found"
) ? static_cast<void> (0) : __assert_fail ("ID < FunctionBBs.size() && \"Basic block not found\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 2715, __PRETTY_FUNCTION__));
2716 V = FunctionBBs[ID];
2717 } else
2718 V = ValueList[ID];
2719 unsigned NumUses = 0;
2720 SmallDenseMap<const Use *, unsigned, 16> Order;
2721 for (const Use &U : V->uses()) {
2722 if (++NumUses > Record.size())
2723 break;
2724 Order[&U] = Record[NumUses - 1];
2725 }
2726 if (Order.size() != Record.size() || NumUses > Record.size())
2727 // Mismatches can happen if the functions are being materialized lazily
2728 // (out-of-order), or a value has been upgraded.
2729 break;
2730
2731 V->sortUseList([&](const Use &L, const Use &R) {
2732 return Order.lookup(&L) < Order.lookup(&R);
2733 });
2734 break;
2735 }
2736 }
2737 }
2738}
2739
2740/// When we see the block for metadata, remember where it is and then skip it.
2741/// This lets us lazily deserialize the metadata.
2742std::error_code BitcodeReader::rememberAndSkipMetadata() {
2743 // Save the current stream state.
2744 uint64_t CurBit = Stream.GetCurrentBitNo();
2745 DeferredMetadataInfo.push_back(CurBit);
2746
2747 // Skip over the block for now.
2748 if (Stream.SkipBlock())
2749 return error("Invalid record");
2750 return std::error_code();
2751}
2752
2753std::error_code BitcodeReader::materializeMetadata() {
2754 for (uint64_t BitPos : DeferredMetadataInfo) {
2755 // Move the bit stream to the saved position.
2756 Stream.JumpToBit(BitPos);
2757 if (std::error_code EC = parseMetadata())
2758 return EC;
2759 }
2760 DeferredMetadataInfo.clear();
2761 return std::error_code();
2762}
2763
2764void BitcodeReader::setStripDebugInfo() { StripDebugInfo = true; }
2765
2766/// When we see the block for a function body, remember where it is and then
2767/// skip it. This lets us lazily deserialize the functions.
2768std::error_code BitcodeReader::rememberAndSkipFunctionBody() {
2769 // Get the function we are talking about.
2770 if (FunctionsWithBodies.empty())
2771 return error("Insufficient function protos");
2772
2773 Function *Fn = FunctionsWithBodies.back();
2774 FunctionsWithBodies.pop_back();
2775
2776 // Save the current stream state.
2777 uint64_t CurBit = Stream.GetCurrentBitNo();
2778 DeferredFunctionInfo[Fn] = CurBit;
2779
2780 // Skip over the function block for now.
2781 if (Stream.SkipBlock())
2782 return error("Invalid record");
2783 return std::error_code();
2784}
2785
2786std::error_code BitcodeReader::globalCleanup() {
2787 // Patch the initializers for globals and aliases up.
2788 resolveGlobalAndAliasInits();
2789 if (!GlobalInits.empty() || !AliasInits.empty())
2790 return error("Malformed global initializer set");
2791
2792 // Look for intrinsic functions which need to be upgraded at some point
2793 for (Function &F : *TheModule) {
2794 Function *NewFn;
2795 if (UpgradeIntrinsicFunction(&F, NewFn))
2796 UpgradedIntrinsics[&F] = NewFn;
2797 }
2798
2799 // Look for global variables which need to be renamed.
2800 for (GlobalVariable &GV : TheModule->globals())
2801 UpgradeGlobalVariable(&GV);
2802
2803 // Force deallocation of memory for these vectors to favor the client that
2804 // want lazy deserialization.
2805 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits);
2806 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits);
2807 return std::error_code();
2808}
2809
2810std::error_code BitcodeReader::parseModule(bool Resume,
2811 bool ShouldLazyLoadMetadata) {
2812 if (Resume)
2813 Stream.JumpToBit(NextUnreadBit);
2814 else if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
2815 return error("Invalid record");
2816
2817 SmallVector<uint64_t, 64> Record;
2818 std::vector<std::string> SectionTable;
2819 std::vector<std::string> GCTable;
2820
2821 // Read all the records for this module.
2822 while (1) {
2823 BitstreamEntry Entry = Stream.advance();
2824
2825 switch (Entry.Kind) {
2826 case BitstreamEntry::Error:
2827 return error("Malformed block");
2828 case BitstreamEntry::EndBlock:
2829 return globalCleanup();
2830
2831 case BitstreamEntry::SubBlock:
2832 switch (Entry.ID) {
2833 default: // Skip unknown content.
2834 if (Stream.SkipBlock())
2835 return error("Invalid record");
2836 break;
2837 case bitc::BLOCKINFO_BLOCK_ID:
2838 if (Stream.ReadBlockInfoBlock())
2839 return error("Malformed block");
2840 break;
2841 case bitc::PARAMATTR_BLOCK_ID:
2842 if (std::error_code EC = parseAttributeBlock())
2843 return EC;
2844 break;
2845 case bitc::PARAMATTR_GROUP_BLOCK_ID:
2846 if (std::error_code EC = parseAttributeGroupBlock())
2847 return EC;
2848 break;
2849 case bitc::TYPE_BLOCK_ID_NEW:
2850 if (std::error_code EC = parseTypeTable())
2851 return EC;
2852 break;
2853 case bitc::VALUE_SYMTAB_BLOCK_ID:
2854 if (std::error_code EC = parseValueSymbolTable())
2855 return EC;
2856 SeenValueSymbolTable = true;
2857 break;
2858 case bitc::CONSTANTS_BLOCK_ID:
2859 if (std::error_code EC = parseConstants())
2860 return EC;
2861 if (std::error_code EC = resolveGlobalAndAliasInits())
2862 return EC;
2863 break;
2864 case bitc::METADATA_BLOCK_ID:
2865 if (ShouldLazyLoadMetadata && !IsMetadataMaterialized) {
2866 if (std::error_code EC = rememberAndSkipMetadata())
2867 return EC;
2868 break;
2869 }
2870 assert(DeferredMetadataInfo.empty() && "Unexpected deferred metadata")((DeferredMetadataInfo.empty() && "Unexpected deferred metadata"
) ? static_cast<void> (0) : __assert_fail ("DeferredMetadataInfo.empty() && \"Unexpected deferred metadata\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 2870, __PRETTY_FUNCTION__));
2871 if (std::error_code EC = parseMetadata())
2872 return EC;
2873 break;
2874 case bitc::FUNCTION_BLOCK_ID:
2875 // If this is the first function body we've seen, reverse the
2876 // FunctionsWithBodies list.
2877 if (!SeenFirstFunctionBody) {
2878 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end());
2879 if (std::error_code EC = globalCleanup())
2880 return EC;
2881 SeenFirstFunctionBody = true;
2882 }
2883
2884 if (std::error_code EC = rememberAndSkipFunctionBody())
2885 return EC;
2886 // Suspend parsing when we reach the function bodies. Subsequent
2887 // materialization calls will resume it when necessary. If the bitcode
2888 // file is old, the symbol table will be at the end instead and will not
2889 // have been seen yet. In this case, just finish the parse now.
2890 if (SeenValueSymbolTable) {
2891 NextUnreadBit = Stream.GetCurrentBitNo();
2892 return std::error_code();
2893 }
2894 break;
2895 case bitc::USELIST_BLOCK_ID:
2896 if (std::error_code EC = parseUseLists())
2897 return EC;
2898 break;
2899 }
2900 continue;
2901
2902 case BitstreamEntry::Record:
2903 // The interesting case.
2904 break;
2905 }
2906
2907
2908 // Read a record.
2909 switch (Stream.readRecord(Entry.ID, Record)) {
2910 default: break; // Default behavior, ignore unknown content.
2911 case bitc::MODULE_CODE_VERSION: { // VERSION: [version#]
2912 if (Record.size() < 1)
2913 return error("Invalid record");
2914 // Only version #0 and #1 are supported so far.
2915 unsigned module_version = Record[0];
2916 switch (module_version) {
2917 default:
2918 return error("Invalid value");
2919 case 0:
2920 UseRelativeIDs = false;
2921 break;
2922 case 1:
2923 UseRelativeIDs = true;
2924 break;
2925 }
2926 break;
2927 }
2928 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N]
2929 std::string S;
2930 if (convertToString(Record, 0, S))
2931 return error("Invalid record");
2932 TheModule->setTargetTriple(S);
2933 break;
2934 }
2935 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N]
2936 std::string S;
2937 if (convertToString(Record, 0, S))
2938 return error("Invalid record");
2939 TheModule->setDataLayout(S);
2940 break;
2941 }
2942 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N]
2943 std::string S;
2944 if (convertToString(Record, 0, S))
2945 return error("Invalid record");
2946 TheModule->setModuleInlineAsm(S);
2947 break;
2948 }
2949 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N]
2950 // FIXME: Remove in 4.0.
2951 std::string S;
2952 if (convertToString(Record, 0, S))
2953 return error("Invalid record");
2954 // Ignore value.
2955 break;
2956 }
2957 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N]
2958 std::string S;
2959 if (convertToString(Record, 0, S))
2960 return error("Invalid record");
2961 SectionTable.push_back(S);
2962 break;
2963 }
2964 case bitc::MODULE_CODE_GCNAME: { // SECTIONNAME: [strchr x N]
2965 std::string S;
2966 if (convertToString(Record, 0, S))
2967 return error("Invalid record");
2968 GCTable.push_back(S);
2969 break;
2970 }
2971 case bitc::MODULE_CODE_COMDAT: { // COMDAT: [selection_kind, name]
2972 if (Record.size() < 2)
2973 return error("Invalid record");
2974 Comdat::SelectionKind SK = getDecodedComdatSelectionKind(Record[0]);
2975 unsigned ComdatNameSize = Record[1];
2976 std::string ComdatName;
2977 ComdatName.reserve(ComdatNameSize);
2978 for (unsigned i = 0; i != ComdatNameSize; ++i)
2979 ComdatName += (char)Record[2 + i];
2980 Comdat *C = TheModule->getOrInsertComdat(ComdatName);
2981 C->setSelectionKind(SK);
2982 ComdatList.push_back(C);
2983 break;
2984 }
2985 // GLOBALVAR: [pointer type, isconst, initid,
2986 // linkage, alignment, section, visibility, threadlocal,
2987 // unnamed_addr, externally_initialized, dllstorageclass,
2988 // comdat]
2989 case bitc::MODULE_CODE_GLOBALVAR: {
2990 if (Record.size() < 6)
2991 return error("Invalid record");
2992 Type *Ty = getTypeByID(Record[0]);
2993 if (!Ty)
2994 return error("Invalid record");
2995 bool isConstant = Record[1] & 1;
2996 bool explicitType = Record[1] & 2;
2997 unsigned AddressSpace;
2998 if (explicitType) {
2999 AddressSpace = Record[1] >> 2;
3000 } else {
3001 if (!Ty->isPointerTy())
3002 return error("Invalid type for value");
3003 AddressSpace = cast<PointerType>(Ty)->getAddressSpace();
3004 Ty = cast<PointerType>(Ty)->getElementType();
3005 }
3006
3007 uint64_t RawLinkage = Record[3];
3008 GlobalValue::LinkageTypes Linkage = getDecodedLinkage(RawLinkage);
3009 unsigned Alignment;
3010 if (std::error_code EC = parseAlignmentValue(Record[4], Alignment))
3011 return EC;
3012 std::string Section;
3013 if (Record[5]) {
3014 if (Record[5]-1 >= SectionTable.size())
3015 return error("Invalid ID");
3016 Section = SectionTable[Record[5]-1];
3017 }
3018 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
3019 // Local linkage must have default visibility.
3020 if (Record.size() > 6 && !GlobalValue::isLocalLinkage(Linkage))
3021 // FIXME: Change to an error if non-default in 4.0.
3022 Visibility = getDecodedVisibility(Record[6]);
3023
3024 GlobalVariable::ThreadLocalMode TLM = GlobalVariable::NotThreadLocal;
3025 if (Record.size() > 7)
3026 TLM = getDecodedThreadLocalMode(Record[7]);
3027
3028 bool UnnamedAddr = false;
3029 if (Record.size() > 8)
3030 UnnamedAddr = Record[8];
3031
3032 bool ExternallyInitialized = false;
3033 if (Record.size() > 9)
3034 ExternallyInitialized = Record[9];
3035
3036 GlobalVariable *NewGV =
3037 new GlobalVariable(*TheModule, Ty, isConstant, Linkage, nullptr, "", nullptr,
3038 TLM, AddressSpace, ExternallyInitialized);
3039 NewGV->setAlignment(Alignment);
3040 if (!Section.empty())
3041 NewGV->setSection(Section);
3042 NewGV->setVisibility(Visibility);
3043 NewGV->setUnnamedAddr(UnnamedAddr);
3044
3045 if (Record.size() > 10)
3046 NewGV->setDLLStorageClass(getDecodedDLLStorageClass(Record[10]));
3047 else
3048 upgradeDLLImportExportLinkage(NewGV, RawLinkage);
3049
3050 ValueList.push_back(NewGV);
3051
3052 // Remember which value to use for the global initializer.
3053 if (unsigned InitID = Record[2])
3054 GlobalInits.push_back(std::make_pair(NewGV, InitID-1));
3055
3056 if (Record.size() > 11) {
3057 if (unsigned ComdatID = Record[11]) {
3058 if (ComdatID > ComdatList.size())
3059 return error("Invalid global variable comdat ID");
3060 NewGV->setComdat(ComdatList[ComdatID - 1]);
3061 }
3062 } else if (hasImplicitComdat(RawLinkage)) {
3063 NewGV->setComdat(reinterpret_cast<Comdat *>(1));
3064 }
3065 break;
3066 }
3067 // FUNCTION: [type, callingconv, isproto, linkage, paramattr,
3068 // alignment, section, visibility, gc, unnamed_addr,
3069 // prologuedata, dllstorageclass, comdat, prefixdata]
3070 case bitc::MODULE_CODE_FUNCTION: {
3071 if (Record.size() < 8)
3072 return error("Invalid record");
3073 Type *Ty = getTypeByID(Record[0]);
3074 if (!Ty)
3075 return error("Invalid record");
3076 if (auto *PTy = dyn_cast<PointerType>(Ty))
3077 Ty = PTy->getElementType();
3078 auto *FTy = dyn_cast<FunctionType>(Ty);
3079 if (!FTy)
3080 return error("Invalid type for value");
3081
3082 Function *Func = Function::Create(FTy, GlobalValue::ExternalLinkage,
3083 "", TheModule);
3084
3085 Func->setCallingConv(static_cast<CallingConv::ID>(Record[1]));
3086 bool isProto = Record[2];
3087 uint64_t RawLinkage = Record[3];
3088 Func->setLinkage(getDecodedLinkage(RawLinkage));
3089 Func->setAttributes(getAttributes(Record[4]));
3090
3091 unsigned Alignment;
3092 if (std::error_code EC = parseAlignmentValue(Record[5], Alignment))
3093 return EC;
3094 Func->setAlignment(Alignment);
3095 if (Record[6]) {
3096 if (Record[6]-1 >= SectionTable.size())
3097 return error("Invalid ID");
3098 Func->setSection(SectionTable[Record[6]-1]);
3099 }
3100 // Local linkage must have default visibility.
3101 if (!Func->hasLocalLinkage())
3102 // FIXME: Change to an error if non-default in 4.0.
3103 Func->setVisibility(getDecodedVisibility(Record[7]));
3104 if (Record.size() > 8 && Record[8]) {
3105 if (Record[8]-1 >= GCTable.size())
3106 return error("Invalid ID");
3107 Func->setGC(GCTable[Record[8]-1].c_str());
3108 }
3109 bool UnnamedAddr = false;
3110 if (Record.size() > 9)
3111 UnnamedAddr = Record[9];
3112 Func->setUnnamedAddr(UnnamedAddr);
3113 if (Record.size() > 10 && Record[10] != 0)
3114 FunctionPrologues.push_back(std::make_pair(Func, Record[10]-1));
3115
3116 if (Record.size() > 11)
3117 Func->setDLLStorageClass(getDecodedDLLStorageClass(Record[11]));
3118 else
3119 upgradeDLLImportExportLinkage(Func, RawLinkage);
3120
3121 if (Record.size() > 12) {
3122 if (unsigned ComdatID = Record[12]) {
3123 if (ComdatID > ComdatList.size())
3124 return error("Invalid function comdat ID");
3125 Func->setComdat(ComdatList[ComdatID - 1]);
3126 }
3127 } else if (hasImplicitComdat(RawLinkage)) {
3128 Func->setComdat(reinterpret_cast<Comdat *>(1));
3129 }
3130
3131 if (Record.size() > 13 && Record[13] != 0)
3132 FunctionPrefixes.push_back(std::make_pair(Func, Record[13]-1));
3133
3134 if (Record.size() > 14 && Record[14] != 0)
3135 FunctionPersonalityFns.push_back(std::make_pair(Func, Record[14] - 1));
3136
3137 ValueList.push_back(Func);
3138
3139 // If this is a function with a body, remember the prototype we are
3140 // creating now, so that we can match up the body with them later.
3141 if (!isProto) {
3142 Func->setIsMaterializable(true);
3143 FunctionsWithBodies.push_back(Func);
3144 DeferredFunctionInfo[Func] = 0;
3145 }
3146 break;
3147 }
3148 // ALIAS: [alias type, aliasee val#, linkage]
3149 // ALIAS: [alias type, aliasee val#, linkage, visibility, dllstorageclass]
3150 case bitc::MODULE_CODE_ALIAS: {
3151 if (Record.size() < 3)
3152 return error("Invalid record");
3153 Type *Ty = getTypeByID(Record[0]);
3154 if (!Ty)
3155 return error("Invalid record");
3156 auto *PTy = dyn_cast<PointerType>(Ty);
3157 if (!PTy)
3158 return error("Invalid type for value");
3159
3160 auto *NewGA =
3161 GlobalAlias::create(PTy, getDecodedLinkage(Record[2]), "", TheModule);
3162 // Old bitcode files didn't have visibility field.
3163 // Local linkage must have default visibility.
3164 if (Record.size() > 3 && !NewGA->hasLocalLinkage())
3165 // FIXME: Change to an error if non-default in 4.0.
3166 NewGA->setVisibility(getDecodedVisibility(Record[3]));
3167 if (Record.size() > 4)
3168 NewGA->setDLLStorageClass(getDecodedDLLStorageClass(Record[4]));
3169 else
3170 upgradeDLLImportExportLinkage(NewGA, Record[2]);
3171 if (Record.size() > 5)
3172 NewGA->setThreadLocalMode(getDecodedThreadLocalMode(Record[5]));
3173 if (Record.size() > 6)
3174 NewGA->setUnnamedAddr(Record[6]);
3175 ValueList.push_back(NewGA);
3176 AliasInits.push_back(std::make_pair(NewGA, Record[1]));
3177 break;
3178 }
3179 /// MODULE_CODE_PURGEVALS: [numvals]
3180 case bitc::MODULE_CODE_PURGEVALS:
3181 // Trim down the value list to the specified size.
3182 if (Record.size() < 1 || Record[0] > ValueList.size())
3183 return error("Invalid record");
3184 ValueList.shrinkTo(Record[0]);
3185 break;
3186 }
3187 Record.clear();
3188 }
3189}
3190
3191std::error_code
3192BitcodeReader::parseBitcodeInto(std::unique_ptr<DataStreamer> Streamer,
3193 Module *M, bool ShouldLazyLoadMetadata) {
3194 TheModule = M;
3195
3196 if (std::error_code EC = initStream(std::move(Streamer)))
3197 return EC;
3198
3199 // Sniff for the signature.
3200 if (Stream.Read(8) != 'B' ||
3201 Stream.Read(8) != 'C' ||
3202 Stream.Read(4) != 0x0 ||
3203 Stream.Read(4) != 0xC ||
3204 Stream.Read(4) != 0xE ||
3205 Stream.Read(4) != 0xD)
3206 return error("Invalid bitcode signature");
3207
3208 // We expect a number of well-defined blocks, though we don't necessarily
3209 // need to understand them all.
3210 while (1) {
3211 if (Stream.AtEndOfStream()) {
3212 // We didn't really read a proper Module.
3213 return error("Malformed IR file");
3214 }
3215
3216 BitstreamEntry Entry =
3217 Stream.advance(BitstreamCursor::AF_DontAutoprocessAbbrevs);
3218
3219 if (Entry.Kind != BitstreamEntry::SubBlock)
3220 return error("Malformed block");
3221
3222 if (Entry.ID == bitc::MODULE_BLOCK_ID)
3223 return parseModule(false, ShouldLazyLoadMetadata);
3224
3225 if (Stream.SkipBlock())
3226 return error("Invalid record");
3227 }
3228}
3229
3230ErrorOr<std::string> BitcodeReader::parseModuleTriple() {
3231 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
3232 return error("Invalid record");
3233
3234 SmallVector<uint64_t, 64> Record;
3235
3236 std::string Triple;
3237 // Read all the records for this module.
3238 while (1) {
3239 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
3240
3241 switch (Entry.Kind) {
3242 case BitstreamEntry::SubBlock: // Handled for us already.
3243 case BitstreamEntry::Error:
3244 return error("Malformed block");
3245 case BitstreamEntry::EndBlock:
3246 return Triple;
3247 case BitstreamEntry::Record:
3248 // The interesting case.
3249 break;
3250 }
3251
3252 // Read a record.
3253 switch (Stream.readRecord(Entry.ID, Record)) {
3254 default: break; // Default behavior, ignore unknown content.
3255 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N]
3256 std::string S;
3257 if (convertToString(Record, 0, S))
3258 return error("Invalid record");
3259 Triple = S;
3260 break;
3261 }
3262 }
3263 Record.clear();
3264 }
3265 llvm_unreachable("Exit infinite loop")::llvm::llvm_unreachable_internal("Exit infinite loop", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3265);
3266}
3267
3268ErrorOr<std::string> BitcodeReader::parseTriple() {
3269 if (std::error_code EC = initStream(nullptr))
3270 return EC;
3271
3272 // Sniff for the signature.
3273 if (Stream.Read(8) != 'B' ||
3274 Stream.Read(8) != 'C' ||
3275 Stream.Read(4) != 0x0 ||
3276 Stream.Read(4) != 0xC ||
3277 Stream.Read(4) != 0xE ||
3278 Stream.Read(4) != 0xD)
3279 return error("Invalid bitcode signature");
3280
3281 // We expect a number of well-defined blocks, though we don't necessarily
3282 // need to understand them all.
3283 while (1) {
3284 BitstreamEntry Entry = Stream.advance();
3285
3286 switch (Entry.Kind) {
3287 case BitstreamEntry::Error:
3288 return error("Malformed block");
3289 case BitstreamEntry::EndBlock:
3290 return std::error_code();
3291
3292 case BitstreamEntry::SubBlock:
3293 if (Entry.ID == bitc::MODULE_BLOCK_ID)
3294 return parseModuleTriple();
3295
3296 // Ignore other sub-blocks.
3297 if (Stream.SkipBlock())
3298 return error("Malformed block");
3299 continue;
3300
3301 case BitstreamEntry::Record:
3302 Stream.skipRecord(Entry.ID);
3303 continue;
3304 }
3305 }
3306}
3307
3308/// Parse metadata attachments.
3309std::error_code BitcodeReader::parseMetadataAttachment(Function &F) {
3310 if (Stream.EnterSubBlock(bitc::METADATA_ATTACHMENT_ID))
3311 return error("Invalid record");
3312
3313 SmallVector<uint64_t, 64> Record;
3314 while (1) {
3315 BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
3316
3317 switch (Entry.Kind) {
3318 case BitstreamEntry::SubBlock: // Handled for us already.
3319 case BitstreamEntry::Error:
3320 return error("Malformed block");
3321 case BitstreamEntry::EndBlock:
3322 return std::error_code();
3323 case BitstreamEntry::Record:
3324 // The interesting case.
3325 break;
3326 }
3327
3328 // Read a metadata attachment record.
3329 Record.clear();
3330 switch (Stream.readRecord(Entry.ID, Record)) {
3331 default: // Default behavior: ignore.
3332 break;
3333 case bitc::METADATA_ATTACHMENT: {
3334 unsigned RecordLength = Record.size();
3335 if (Record.empty())
3336 return error("Invalid record");
3337 if (RecordLength % 2 == 0) {
3338 // A function attachment.
3339 for (unsigned I = 0; I != RecordLength; I += 2) {
3340 auto K = MDKindMap.find(Record[I]);
3341 if (K == MDKindMap.end())
3342 return error("Invalid ID");
3343 Metadata *MD = MDValueList.getValueFwdRef(Record[I + 1]);
3344 F.setMetadata(K->second, cast<MDNode>(MD));
3345 }
3346 continue;
3347 }
3348
3349 // An instruction attachment.
3350 Instruction *Inst = InstructionList[Record[0]];
3351 for (unsigned i = 1; i != RecordLength; i = i+2) {
3352 unsigned Kind = Record[i];
3353 DenseMap<unsigned, unsigned>::iterator I =
3354 MDKindMap.find(Kind);
3355 if (I == MDKindMap.end())
3356 return error("Invalid ID");
3357 Metadata *Node = MDValueList.getValueFwdRef(Record[i + 1]);
3358 if (isa<LocalAsMetadata>(Node))
3359 // Drop the attachment. This used to be legal, but there's no
3360 // upgrade path.
3361 break;
3362 Inst->setMetadata(I->second, cast<MDNode>(Node));
3363 if (I->second == LLVMContext::MD_tbaa)
3364 InstsWithTBAATag.push_back(Inst);
3365 }
3366 break;
3367 }
3368 }
3369 }
3370}
3371
3372static std::error_code typeCheckLoadStoreInst(DiagnosticHandlerFunction DH,
3373 Type *ValType, Type *PtrType) {
3374 if (!isa<PointerType>(PtrType))
3375 return error(DH, "Load/Store operand is not a pointer type");
3376 Type *ElemType = cast<PointerType>(PtrType)->getElementType();
3377
3378 if (ValType && ValType != ElemType)
3379 return error(DH, "Explicit load/store type does not match pointee type of "
3380 "pointer operand");
3381 if (!PointerType::isLoadableOrStorableType(ElemType))
3382 return error(DH, "Cannot load/store from pointer");
3383 return std::error_code();
3384}
3385
3386/// Lazily parse the specified function body block.
3387std::error_code BitcodeReader::parseFunctionBody(Function *F) {
3388 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID))
3389 return error("Invalid record");
3390
3391 InstructionList.clear();
3392 unsigned ModuleValueListSize = ValueList.size();
3393 unsigned ModuleMDValueListSize = MDValueList.size();
3394
3395 // Add all the function arguments to the value table.
3396 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
3397 ValueList.push_back(I);
3398
3399 unsigned NextValueNo = ValueList.size();
3400 BasicBlock *CurBB = nullptr;
3401 unsigned CurBBNo = 0;
3402
3403 DebugLoc LastLoc;
3404 auto getLastInstruction = [&]() -> Instruction * {
3405 if (CurBB && !CurBB->empty())
3406 return &CurBB->back();
3407 else if (CurBBNo && FunctionBBs[CurBBNo - 1] &&
3408 !FunctionBBs[CurBBNo - 1]->empty())
3409 return &FunctionBBs[CurBBNo - 1]->back();
3410 return nullptr;
3411 };
3412
3413 // Read all the records.
3414 SmallVector<uint64_t, 64> Record;
3415 while (1) {
3416 BitstreamEntry Entry = Stream.advance();
3417
3418 switch (Entry.Kind) {
3419 case BitstreamEntry::Error:
3420 return error("Malformed block");
3421 case BitstreamEntry::EndBlock:
3422 goto OutOfRecordLoop;
3423
3424 case BitstreamEntry::SubBlock:
3425 switch (Entry.ID) {
3426 default: // Skip unknown content.
3427 if (Stream.SkipBlock())
3428 return error("Invalid record");
3429 break;
3430 case bitc::CONSTANTS_BLOCK_ID:
3431 if (std::error_code EC = parseConstants())
3432 return EC;
3433 NextValueNo = ValueList.size();
3434 break;
3435 case bitc::VALUE_SYMTAB_BLOCK_ID:
3436 if (std::error_code EC = parseValueSymbolTable())
3437 return EC;
3438 break;
3439 case bitc::METADATA_ATTACHMENT_ID:
3440 if (std::error_code EC = parseMetadataAttachment(*F))
3441 return EC;
3442 break;
3443 case bitc::METADATA_BLOCK_ID:
3444 if (std::error_code EC = parseMetadata())
3445 return EC;
3446 break;
3447 case bitc::USELIST_BLOCK_ID:
3448 if (std::error_code EC = parseUseLists())
3449 return EC;
3450 break;
3451 }
3452 continue;
3453
3454 case BitstreamEntry::Record:
3455 // The interesting case.
3456 break;
3457 }
3458
3459 // Read a record.
3460 Record.clear();
3461 Instruction *I = nullptr;
3462 unsigned BitCode = Stream.readRecord(Entry.ID, Record);
3463 switch (BitCode) {
3464 default: // Default behavior: reject
3465 return error("Invalid value");
3466 case bitc::FUNC_CODE_DECLAREBLOCKS: { // DECLAREBLOCKS: [nblocks]
3467 if (Record.size() < 1 || Record[0] == 0)
3468 return error("Invalid record");
3469 // Create all the basic blocks for the function.
3470 FunctionBBs.resize(Record[0]);
3471
3472 // See if anything took the address of blocks in this function.
3473 auto BBFRI = BasicBlockFwdRefs.find(F);
3474 if (BBFRI == BasicBlockFwdRefs.end()) {
3475 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i)
3476 FunctionBBs[i] = BasicBlock::Create(Context, "", F);
3477 } else {
3478 auto &BBRefs = BBFRI->second;
3479 // Check for invalid basic block references.
3480 if (BBRefs.size() > FunctionBBs.size())
3481 return error("Invalid ID");
3482 assert(!BBRefs.empty() && "Unexpected empty array")((!BBRefs.empty() && "Unexpected empty array") ? static_cast
<void> (0) : __assert_fail ("!BBRefs.empty() && \"Unexpected empty array\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3482, __PRETTY_FUNCTION__));
3483 assert(!BBRefs.front() && "Invalid reference to entry block")((!BBRefs.front() && "Invalid reference to entry block"
) ? static_cast<void> (0) : __assert_fail ("!BBRefs.front() && \"Invalid reference to entry block\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 3483, __PRETTY_FUNCTION__));
3484 for (unsigned I = 0, E = FunctionBBs.size(), RE = BBRefs.size(); I != E;
3485 ++I)
3486 if (I < RE && BBRefs[I]) {
3487 BBRefs[I]->insertInto(F);
3488 FunctionBBs[I] = BBRefs[I];
3489 } else {
3490 FunctionBBs[I] = BasicBlock::Create(Context, "", F);
3491 }
3492
3493 // Erase from the table.
3494 BasicBlockFwdRefs.erase(BBFRI);
3495 }
3496
3497 CurBB = FunctionBBs[0];
3498 continue;
3499 }
3500
3501 case bitc::FUNC_CODE_DEBUG_LOC_AGAIN: // DEBUG_LOC_AGAIN
3502 // This record indicates that the last instruction is at the same
3503 // location as the previous instruction with a location.
3504 I = getLastInstruction();
3505
3506 if (!I)
3507 return error("Invalid record");
3508 I->setDebugLoc(LastLoc);
3509 I = nullptr;
3510 continue;
3511
3512 case bitc::FUNC_CODE_DEBUG_LOC: { // DEBUG_LOC: [line, col, scope, ia]
3513 I = getLastInstruction();
3514 if (!I || Record.size() < 4)
3515 return error("Invalid record");
3516
3517 unsigned Line = Record[0], Col = Record[1];
3518 unsigned ScopeID = Record[2], IAID = Record[3];
3519
3520 MDNode *Scope = nullptr, *IA = nullptr;
3521 if (ScopeID) Scope = cast<MDNode>(MDValueList.getValueFwdRef(ScopeID-1));
3522 if (IAID) IA = cast<MDNode>(MDValueList.getValueFwdRef(IAID-1));
3523 LastLoc = DebugLoc::get(Line, Col, Scope, IA);
3524 I->setDebugLoc(LastLoc);
3525 I = nullptr;
3526 continue;
3527 }
3528
3529 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode]
3530 unsigned OpNum = 0;
3531 Value *LHS, *RHS;
3532 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
3533 popValue(Record, OpNum, NextValueNo, LHS->getType(), RHS) ||
3534 OpNum+1 > Record.size())
3535 return error("Invalid record");
3536
3537 int Opc = getDecodedBinaryOpcode(Record[OpNum++], LHS->getType());
3538 if (Opc == -1)
3539 return error("Invalid record");
3540 I = BinaryOperator::Create((Instruction::BinaryOps)Opc, LHS, RHS);
3541 InstructionList.push_back(I);
3542 if (OpNum < Record.size()) {
3543 if (Opc == Instruction::Add ||
3544 Opc == Instruction::Sub ||
3545 Opc == Instruction::Mul ||
3546 Opc == Instruction::Shl) {
3547 if (Record[OpNum] & (1 << bitc::OBO_NO_SIGNED_WRAP))
3548 cast<BinaryOperator>(I)->setHasNoSignedWrap(true);
3549 if (Record[OpNum] & (1 << bitc::OBO_NO_UNSIGNED_WRAP))
3550 cast<BinaryOperator>(I)->setHasNoUnsignedWrap(true);
3551 } else if (Opc == Instruction::SDiv ||
3552 Opc == Instruction::UDiv ||
3553 Opc == Instruction::LShr ||
3554 Opc == Instruction::AShr) {
3555 if (Record[OpNum] & (1 << bitc::PEO_EXACT))
3556 cast<BinaryOperator>(I)->setIsExact(true);
3557 } else if (isa<FPMathOperator>(I)) {
3558 FastMathFlags FMF = getDecodedFastMathFlags(Record[OpNum]);
3559 if (FMF.any())
3560 I->setFastMathFlags(FMF);
3561 }
3562
3563 }
3564 break;
3565 }
3566 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc]
3567 unsigned OpNum = 0;
3568 Value *Op;
3569 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
3570 OpNum+2 != Record.size())
3571 return error("Invalid record");
3572
3573 Type *ResTy = getTypeByID(Record[OpNum]);
3574 int Opc = getDecodedCastOpcode(Record[OpNum + 1]);
3575 if (Opc == -1 || !ResTy)
3576 return error("Invalid record");
3577 Instruction *Temp = nullptr;
3578 if ((I = UpgradeBitCastInst(Opc, Op, ResTy, Temp))) {
3579 if (Temp) {
3580 InstructionList.push_back(Temp);
3581 CurBB->getInstList().push_back(Temp);
3582 }
3583 } else {
3584 I = CastInst::Create((Instruction::CastOps)Opc, Op, ResTy);
3585 }
3586 InstructionList.push_back(I);
3587 break;
3588 }
3589 case bitc::FUNC_CODE_INST_INBOUNDS_GEP_OLD:
3590 case bitc::FUNC_CODE_INST_GEP_OLD:
3591 case bitc::FUNC_CODE_INST_GEP: { // GEP: type, [n x operands]
3592 unsigned OpNum = 0;
3593
3594 Type *Ty;
3595 bool InBounds;
3596
3597 if (BitCode == bitc::FUNC_CODE_INST_GEP) {
3598 InBounds = Record[OpNum++];
3599 Ty = getTypeByID(Record[OpNum++]);
3600 } else {
3601 InBounds = BitCode == bitc::FUNC_CODE_INST_INBOUNDS_GEP_OLD;
3602 Ty = nullptr;
3603 }
3604
3605 Value *BasePtr;
3606 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr))
3607 return error("Invalid record");
3608
3609 if (!Ty)
3610 Ty = cast<SequentialType>(BasePtr->getType()->getScalarType())
3611 ->getElementType();
3612 else if (Ty !=
3613 cast<SequentialType>(BasePtr->getType()->getScalarType())
3614 ->getElementType())
3615 return error(
3616 "Explicit gep type does not match pointee type of pointer operand");
3617
3618 SmallVector<Value*, 16> GEPIdx;
3619 while (OpNum != Record.size()) {
3620 Value *Op;
3621 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
3622 return error("Invalid record");
3623 GEPIdx.push_back(Op);
3624 }
3625
3626 I = GetElementPtrInst::Create(Ty, BasePtr, GEPIdx);
3627
3628 InstructionList.push_back(I);
3629 if (InBounds)
3630 cast<GetElementPtrInst>(I)->setIsInBounds(true);
3631 break;
3632 }
3633
3634 case bitc::FUNC_CODE_INST_EXTRACTVAL: {
3635 // EXTRACTVAL: [opty, opval, n x indices]
3636 unsigned OpNum = 0;
3637 Value *Agg;
3638 if (getValueTypePair(Record, OpNum, NextValueNo, Agg))
3639 return error("Invalid record");
3640
3641 unsigned RecSize = Record.size();
3642 if (OpNum == RecSize)
3643 return error("EXTRACTVAL: Invalid instruction with 0 indices");
3644
3645 SmallVector<unsigned, 4> EXTRACTVALIdx;
3646 Type *CurTy = Agg->getType();
3647 for (; OpNum != RecSize; ++OpNum) {
3648 bool IsArray = CurTy->isArrayTy();
3649 bool IsStruct = CurTy->isStructTy();
3650 uint64_t Index = Record[OpNum];
3651
3652 if (!IsStruct && !IsArray)
3653 return error("EXTRACTVAL: Invalid type");
3654 if ((unsigned)Index != Index)
3655 return error("Invalid value");
3656 if (IsStruct && Index >= CurTy->subtypes().size())
3657 return error("EXTRACTVAL: Invalid struct index");
3658 if (IsArray && Index >= CurTy->getArrayNumElements())
3659 return error("EXTRACTVAL: Invalid array index");
3660 EXTRACTVALIdx.push_back((unsigned)Index);
3661
3662 if (IsStruct)
3663 CurTy = CurTy->subtypes()[Index];
3664 else
3665 CurTy = CurTy->subtypes()[0];
3666 }
3667
3668 I = ExtractValueInst::Create(Agg, EXTRACTVALIdx);
3669 InstructionList.push_back(I);
3670 break;
3671 }
3672
3673 case bitc::FUNC_CODE_INST_INSERTVAL: {
3674 // INSERTVAL: [opty, opval, opty, opval, n x indices]
3675 unsigned OpNum = 0;
3676 Value *Agg;
3677 if (getValueTypePair(Record, OpNum, NextValueNo, Agg))
3678 return error("Invalid record");
3679 Value *Val;
3680 if (getValueTypePair(Record, OpNum, NextValueNo, Val))
3681 return error("Invalid record");
3682
3683 unsigned RecSize = Record.size();
3684 if (OpNum == RecSize)
3685 return error("INSERTVAL: Invalid instruction with 0 indices");
3686
3687 SmallVector<unsigned, 4> INSERTVALIdx;
3688 Type *CurTy = Agg->getType();
3689 for (; OpNum != RecSize; ++OpNum) {
3690 bool IsArray = CurTy->isArrayTy();
3691 bool IsStruct = CurTy->isStructTy();
3692 uint64_t Index = Record[OpNum];
3693
3694 if (!IsStruct && !IsArray)
3695 return error("INSERTVAL: Invalid type");
3696 if ((unsigned)Index != Index)
3697 return error("Invalid value");
3698 if (IsStruct && Index >= CurTy->subtypes().size())
3699 return error("INSERTVAL: Invalid struct index");
3700 if (IsArray && Index >= CurTy->getArrayNumElements())
3701 return error("INSERTVAL: Invalid array index");
3702
3703 INSERTVALIdx.push_back((unsigned)Index);
3704 if (IsStruct)
3705 CurTy = CurTy->subtypes()[Index];
3706 else
3707 CurTy = CurTy->subtypes()[0];
3708 }
3709
3710 if (CurTy != Val->getType())
3711 return error("Inserted value type doesn't match aggregate type");
3712
3713 I = InsertValueInst::Create(Agg, Val, INSERTVALIdx);
3714 InstructionList.push_back(I);
3715 break;
3716 }
3717
3718 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval]
3719 // obsolete form of select
3720 // handles select i1 ... in old bitcode
3721 unsigned OpNum = 0;
3722 Value *TrueVal, *FalseVal, *Cond;
3723 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
3724 popValue(Record, OpNum, NextValueNo, TrueVal->getType(), FalseVal) ||
3725 popValue(Record, OpNum, NextValueNo, Type::getInt1Ty(Context), Cond))
3726 return error("Invalid record");
3727
3728 I = SelectInst::Create(Cond, TrueVal, FalseVal);
3729 InstructionList.push_back(I);
3730 break;
3731 }
3732
3733 case bitc::FUNC_CODE_INST_VSELECT: {// VSELECT: [ty,opval,opval,predty,pred]
3734 // new form of select
3735 // handles select i1 or select [N x i1]
3736 unsigned OpNum = 0;
3737 Value *TrueVal, *FalseVal, *Cond;
3738 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
3739 popValue(Record, OpNum, NextValueNo, TrueVal->getType(), FalseVal) ||
3740 getValueTypePair(Record, OpNum, NextValueNo, Cond))
3741 return error("Invalid record");
3742
3743 // select condition can be either i1 or [N x i1]
3744 if (VectorType* vector_type =
3745 dyn_cast<VectorType>(Cond->getType())) {
3746 // expect <n x i1>
3747 if (vector_type->getElementType() != Type::getInt1Ty(Context))
3748 return error("Invalid type for value");
3749 } else {
3750 // expect i1
3751 if (Cond->getType() != Type::getInt1Ty(Context))
3752 return error("Invalid type for value");
3753 }
3754
3755 I = SelectInst::Create(Cond, TrueVal, FalseVal);
3756 InstructionList.push_back(I);
3757 break;
3758 }
3759
3760 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval]
3761 unsigned OpNum = 0;
3762 Value *Vec, *Idx;
3763 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) ||
3764 getValueTypePair(Record, OpNum, NextValueNo, Idx))
3765 return error("Invalid record");
3766 if (!Vec->getType()->isVectorTy())
3767 return error("Invalid type for value");
3768 I = ExtractElementInst::Create(Vec, Idx);
3769 InstructionList.push_back(I);
3770 break;
3771 }
3772
3773 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval]
3774 unsigned OpNum = 0;
3775 Value *Vec, *Elt, *Idx;
3776 if (getValueTypePair(Record, OpNum, NextValueNo, Vec))
3777 return error("Invalid record");
3778 if (!Vec->getType()->isVectorTy())
3779 return error("Invalid type for value");
3780 if (popValue(Record, OpNum, NextValueNo,
3781 cast<VectorType>(Vec->getType())->getElementType(), Elt) ||
3782 getValueTypePair(Record, OpNum, NextValueNo, Idx))
3783 return error("Invalid record");
3784 I = InsertElementInst::Create(Vec, Elt, Idx);
3785 InstructionList.push_back(I);
3786 break;
3787 }
3788
3789 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval]
3790 unsigned OpNum = 0;
3791 Value *Vec1, *Vec2, *Mask;
3792 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) ||
3793 popValue(Record, OpNum, NextValueNo, Vec1->getType(), Vec2))
3794 return error("Invalid record");
3795
3796 if (getValueTypePair(Record, OpNum, NextValueNo, Mask))
3797 return error("Invalid record");
3798 if (!Vec1->getType()->isVectorTy() || !Vec2->getType()->isVectorTy())
3799 return error("Invalid type for value");
3800 I = new ShuffleVectorInst(Vec1, Vec2, Mask);
3801 InstructionList.push_back(I);
3802 break;
3803 }
3804
3805 case bitc::FUNC_CODE_INST_CMP: // CMP: [opty, opval, opval, pred]
3806 // Old form of ICmp/FCmp returning bool
3807 // Existed to differentiate between icmp/fcmp and vicmp/vfcmp which were
3808 // both legal on vectors but had different behaviour.
3809 case bitc::FUNC_CODE_INST_CMP2: { // CMP2: [opty, opval, opval, pred]
3810 // FCmp/ICmp returning bool or vector of bool
3811
3812 unsigned OpNum = 0;
3813 Value *LHS, *RHS;
3814 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) ||
3815 popValue(Record, OpNum, NextValueNo, LHS->getType(), RHS))
3816 return error("Invalid record");
3817
3818 unsigned PredVal = Record[OpNum];
3819 bool IsFP = LHS->getType()->isFPOrFPVectorTy();
3820 FastMathFlags FMF;
3821 if (IsFP && Record.size() > OpNum+1)
3822 FMF = getDecodedFastMathFlags(Record[++OpNum]);
3823
3824 if (OpNum+1 != Record.size())
3825 return error("Invalid record");
3826
3827 if (LHS->getType()->isFPOrFPVectorTy())
3828 I = new FCmpInst((FCmpInst::Predicate)PredVal, LHS, RHS);
3829 else
3830 I = new ICmpInst((ICmpInst::Predicate)PredVal, LHS, RHS);
3831
3832 if (FMF.any())
3833 I->setFastMathFlags(FMF);
3834 InstructionList.push_back(I);
3835 break;
3836 }
3837
3838 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>]
3839 {
3840 unsigned Size = Record.size();
3841 if (Size == 0) {
3842 I = ReturnInst::Create(Context);
3843 InstructionList.push_back(I);
3844 break;
3845 }
3846
3847 unsigned OpNum = 0;
3848 Value *Op = nullptr;
3849 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
3850 return error("Invalid record");
3851 if (OpNum != Record.size())
3852 return error("Invalid record");
3853
3854 I = ReturnInst::Create(Context, Op);
3855 InstructionList.push_back(I);
3856 break;
3857 }
3858 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#]
3859 if (Record.size() != 1 && Record.size() != 3)
3860 return error("Invalid record");
3861 BasicBlock *TrueDest = getBasicBlock(Record[0]);
3862 if (!TrueDest)
3863 return error("Invalid record");
3864
3865 if (Record.size() == 1) {
3866 I = BranchInst::Create(TrueDest);
3867 InstructionList.push_back(I);
3868 }
3869 else {
3870 BasicBlock *FalseDest = getBasicBlock(Record[1]);
3871 Value *Cond = getValue(Record, 2, NextValueNo,
3872 Type::getInt1Ty(Context));
3873 if (!FalseDest || !Cond)
3874 return error("Invalid record");
3875 I = BranchInst::Create(TrueDest, FalseDest, Cond);
3876 InstructionList.push_back(I);
3877 }
3878 break;
3879 }
3880 case bitc::FUNC_CODE_INST_CLEANUPRET: { // CLEANUPRET: [val] or [val,bb#]
3881 if (Record.size() != 1 && Record.size() != 2)
3882 return error("Invalid record");
3883 unsigned Idx = 0;
3884 Value *CleanupPad = getValue(Record, Idx++, NextValueNo,
3885 Type::getTokenTy(Context), OC_CleanupPad);
3886 if (!CleanupPad)
3887 return error("Invalid record");
3888 BasicBlock *UnwindDest = nullptr;
3889 if (Record.size() == 2) {
3890 UnwindDest = getBasicBlock(Record[Idx++]);
3891 if (!UnwindDest)
3892 return error("Invalid record");
3893 }
3894
3895 I = CleanupReturnInst::Create(cast<CleanupPadInst>(CleanupPad),
3896 UnwindDest);
3897 InstructionList.push_back(I);
3898 break;
3899 }
3900 case bitc::FUNC_CODE_INST_CATCHRET: { // CATCHRET: [val,bb#]
3901 if (Record.size() != 2)
3902 return error("Invalid record");
3903 unsigned Idx = 0;
3904 Value *CatchPad = getValue(Record, Idx++, NextValueNo,
3905 Type::getTokenTy(Context), OC_CatchPad);
3906 if (!CatchPad)
3907 return error("Invalid record");
3908 BasicBlock *BB = getBasicBlock(Record[Idx++]);
3909 if (!BB)
3910 return error("Invalid record");
3911
3912 I = CatchReturnInst::Create(cast<CatchPadInst>(CatchPad), BB);
3913 InstructionList.push_back(I);
3914 break;
3915 }
3916 case bitc::FUNC_CODE_INST_CATCHPAD: { // CATCHPAD: [bb#,bb#,num,(ty,val)*]
3917 if (Record.size() < 3)
3918 return error("Invalid record");
3919 unsigned Idx = 0;
3920 BasicBlock *NormalBB = getBasicBlock(Record[Idx++]);
3921 if (!NormalBB)
3922 return error("Invalid record");
3923 BasicBlock *UnwindBB = getBasicBlock(Record[Idx++]);
3924 if (!UnwindBB)
3925 return error("Invalid record");
3926 unsigned NumArgOperands = Record[Idx++];
3927 SmallVector<Value *, 2> Args;
3928 for (unsigned Op = 0; Op != NumArgOperands; ++Op) {
3929 Value *Val;
3930 if (getValueTypePair(Record, Idx, NextValueNo, Val))
3931 return error("Invalid record");
3932 Args.push_back(Val);
3933 }
3934 if (Record.size() != Idx)
3935 return error("Invalid record");
3936
3937 I = CatchPadInst::Create(NormalBB, UnwindBB, Args);
3938 InstructionList.push_back(I);
3939 break;
3940 }
3941 case bitc::FUNC_CODE_INST_TERMINATEPAD: { // TERMINATEPAD: [bb#,num,(ty,val)*]
3942 if (Record.size() < 1)
3943 return error("Invalid record");
3944 unsigned Idx = 0;
3945 bool HasUnwindDest = !!Record[Idx++];
3946 BasicBlock *UnwindDest = nullptr;
3947 if (HasUnwindDest) {
3948 if (Idx == Record.size())
3949 return error("Invalid record");
3950 UnwindDest = getBasicBlock(Record[Idx++]);
3951 if (!UnwindDest)
3952 return error("Invalid record");
3953 }
3954 unsigned NumArgOperands = Record[Idx++];
3955 SmallVector<Value *, 2> Args;
3956 for (unsigned Op = 0; Op != NumArgOperands; ++Op) {
3957 Value *Val;
3958 if (getValueTypePair(Record, Idx, NextValueNo, Val))
3959 return error("Invalid record");
3960 Args.push_back(Val);
3961 }
3962 if (Record.size() != Idx)
3963 return error("Invalid record");
3964
3965 I = TerminatePadInst::Create(Context, UnwindDest, Args);
3966 InstructionList.push_back(I);
3967 break;
3968 }
3969 case bitc::FUNC_CODE_INST_CLEANUPPAD: { // CLEANUPPAD: [num,(ty,val)*]
3970 if (Record.size() < 1)
3971 return error("Invalid record");
3972 unsigned Idx = 0;
3973 unsigned NumArgOperands = Record[Idx++];
3974 SmallVector<Value *, 2> Args;
3975 for (unsigned Op = 0; Op != NumArgOperands; ++Op) {
3976 Value *Val;
3977 if (getValueTypePair(Record, Idx, NextValueNo, Val))
3978 return error("Invalid record");
3979 Args.push_back(Val);
3980 }
3981 if (Record.size() != Idx)
3982 return error("Invalid record");
3983
3984 I = CleanupPadInst::Create(Context, Args);
3985 InstructionList.push_back(I);
3986 break;
3987 }
3988 case bitc::FUNC_CODE_INST_CATCHENDPAD: { // CATCHENDPADINST: [bb#] or []
3989 if (Record.size() > 1)
3990 return error("Invalid record");
3991 BasicBlock *BB = nullptr;
3992 if (Record.size() == 1) {
3993 BB = getBasicBlock(Record[0]);
3994 if (!BB)
3995 return error("Invalid record");
3996 }
3997 I = CatchEndPadInst::Create(Context, BB);
3998 InstructionList.push_back(I);
3999 break;
4000 }
4001 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, op0, op1, ...]
4002 // Check magic
4003 if ((Record[0] >> 16) == SWITCH_INST_MAGIC) {
4004 // "New" SwitchInst format with case ranges. The changes to write this
4005 // format were reverted but we still recognize bitcode that uses it.
4006 // Hopefully someday we will have support for case ranges and can use
4007 // this format again.
4008
4009 Type *OpTy = getTypeByID(Record[1]);
4010 unsigned ValueBitWidth = cast<IntegerType>(OpTy)->getBitWidth();
4011
4012 Value *Cond = getValue(Record, 2, NextValueNo, OpTy);
4013 BasicBlock *Default = getBasicBlock(Record[3]);
4014 if (!OpTy || !Cond || !Default)
4015 return error("Invalid record");
4016
4017 unsigned NumCases = Record[4];
4018
4019 SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases);
4020 InstructionList.push_back(SI);
4021
4022 unsigned CurIdx = 5;
4023 for (unsigned i = 0; i != NumCases; ++i) {
4024 SmallVector<ConstantInt*, 1> CaseVals;
4025 unsigned NumItems = Record[CurIdx++];
4026 for (unsigned ci = 0; ci != NumItems; ++ci) {
4027 bool isSingleNumber = Record[CurIdx++];
4028
4029 APInt Low;
4030 unsigned ActiveWords = 1;
4031 if (ValueBitWidth > 64)
4032 ActiveWords = Record[CurIdx++];
4033 Low = readWideAPInt(makeArrayRef(&Record[CurIdx], ActiveWords),
4034 ValueBitWidth);
4035 CurIdx += ActiveWords;
4036
4037 if (!isSingleNumber) {
4038 ActiveWords = 1;
4039 if (ValueBitWidth > 64)
4040 ActiveWords = Record[CurIdx++];
4041 APInt High = readWideAPInt(
4042 makeArrayRef(&Record[CurIdx], ActiveWords), ValueBitWidth);
4043 CurIdx += ActiveWords;
4044
4045 // FIXME: It is not clear whether values in the range should be
4046 // compared as signed or unsigned values. The partially
4047 // implemented changes that used this format in the past used
4048 // unsigned comparisons.
4049 for ( ; Low.ule(High); ++Low)
4050 CaseVals.push_back(ConstantInt::get(Context, Low));
4051 } else
4052 CaseVals.push_back(ConstantInt::get(Context, Low));
4053 }
4054 BasicBlock *DestBB = getBasicBlock(Record[CurIdx++]);
4055 for (SmallVector<ConstantInt*, 1>::iterator cvi = CaseVals.begin(),
4056 cve = CaseVals.end(); cvi != cve; ++cvi)
4057 SI->addCase(*cvi, DestBB);
4058 }
4059 I = SI;
4060 break;
4061 }
4062
4063 // Old SwitchInst format without case ranges.
4064
4065 if (Record.size() < 3 || (Record.size() & 1) == 0)
4066 return error("Invalid record");
4067 Type *OpTy = getTypeByID(Record[0]);
4068 Value *Cond = getValue(Record, 1, NextValueNo, OpTy);
4069 BasicBlock *Default = getBasicBlock(Record[2]);
4070 if (!OpTy || !Cond || !Default)
4071 return error("Invalid record");
4072 unsigned NumCases = (Record.size()-3)/2;
4073 SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases);
4074 InstructionList.push_back(SI);
4075 for (unsigned i = 0, e = NumCases; i != e; ++i) {
4076 ConstantInt *CaseVal =
4077 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy));
4078 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]);
4079 if (!CaseVal || !DestBB) {
4080 delete SI;
4081 return error("Invalid record");
4082 }
4083 SI->addCase(CaseVal, DestBB);
4084 }
4085 I = SI;
4086 break;
4087 }
4088 case bitc::FUNC_CODE_INST_INDIRECTBR: { // INDIRECTBR: [opty, op0, op1, ...]
4089 if (Record.size() < 2)
4090 return error("Invalid record");
4091 Type *OpTy = getTypeByID(Record[0]);
4092 Value *Address = getValue(Record, 1, NextValueNo, OpTy);
4093 if (!OpTy || !Address)
4094 return error("Invalid record");
4095 unsigned NumDests = Record.size()-2;
4096 IndirectBrInst *IBI = IndirectBrInst::Create(Address, NumDests);
4097 InstructionList.push_back(IBI);
4098 for (unsigned i = 0, e = NumDests; i != e; ++i) {
4099 if (BasicBlock *DestBB = getBasicBlock(Record[2+i])) {
4100 IBI->addDestination(DestBB);
4101 } else {
4102 delete IBI;
4103 return error("Invalid record");
4104 }
4105 }
4106 I = IBI;
4107 break;
4108 }
4109
4110 case bitc::FUNC_CODE_INST_INVOKE: {
4111 // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...]
4112 if (Record.size() < 4)
4113 return error("Invalid record");
4114 unsigned OpNum = 0;
4115 AttributeSet PAL = getAttributes(Record[OpNum++]);
4116 unsigned CCInfo = Record[OpNum++];
4117 BasicBlock *NormalBB = getBasicBlock(Record[OpNum++]);
4118 BasicBlock *UnwindBB = getBasicBlock(Record[OpNum++]);
4119
4120 FunctionType *FTy = nullptr;
4121 if (CCInfo >> 13 & 1 &&
4122 !(FTy = dyn_cast<FunctionType>(getTypeByID(Record[OpNum++]))))
4123 return error("Explicit invoke type is not a function type");
4124
4125 Value *Callee;
4126 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
4127 return error("Invalid record");
4128
4129 PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType());
4130 if (!CalleeTy)
4131 return error("Callee is not a pointer");
4132 if (!FTy) {
4133 FTy = dyn_cast<FunctionType>(CalleeTy->getElementType());
4134 if (!FTy)
4135 return error("Callee is not of pointer to function type");
4136 } else if (CalleeTy->getElementType() != FTy)
4137 return error("Explicit invoke type does not match pointee type of "
4138 "callee operand");
4139 if (Record.size() < FTy->getNumParams() + OpNum)
4140 return error("Insufficient operands to call");
4141
4142 SmallVector<Value*, 16> Ops;
4143 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
4144 Ops.push_back(getValue(Record, OpNum, NextValueNo,
4145 FTy->getParamType(i)));
4146 if (!Ops.back())
4147 return error("Invalid record");
4148 }
4149
4150 if (!FTy->isVarArg()) {
4151 if (Record.size() != OpNum)
4152 return error("Invalid record");
4153 } else {
4154 // Read type/value pairs for varargs params.
4155 while (OpNum != Record.size()) {
4156 Value *Op;
4157 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
4158 return error("Invalid record");
4159 Ops.push_back(Op);
4160 }
4161 }
4162
4163 I = InvokeInst::Create(Callee, NormalBB, UnwindBB, Ops);
4164 InstructionList.push_back(I);
4165 cast<InvokeInst>(I)
4166 ->setCallingConv(static_cast<CallingConv::ID>(~(1U << 13) & CCInfo));
4167 cast<InvokeInst>(I)->setAttributes(PAL);
4168 break;
4169 }
4170 case bitc::FUNC_CODE_INST_RESUME: { // RESUME: [opval]
4171 unsigned Idx = 0;
4172 Value *Val = nullptr;
4173 if (getValueTypePair(Record, Idx, NextValueNo, Val))
4174 return error("Invalid record");
4175 I = ResumeInst::Create(Val);
4176 InstructionList.push_back(I);
4177 break;
4178 }
4179 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE
4180 I = new UnreachableInst(Context);
4181 InstructionList.push_back(I);
4182 break;
4183 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...]
4184 if (Record.size() < 1 || ((Record.size()-1)&1))
4185 return error("Invalid record");
4186 Type *Ty = getTypeByID(Record[0]);
4187 if (!Ty)
4188 return error("Invalid record");
4189
4190 PHINode *PN = PHINode::Create(Ty, (Record.size()-1)/2);
4191 InstructionList.push_back(PN);
4192
4193 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) {
4194 Value *V;
4195 // With the new function encoding, it is possible that operands have
4196 // negative IDs (for forward references). Use a signed VBR
4197 // representation to keep the encoding small.
4198 if (UseRelativeIDs)
4199 V = getValueSigned(Record, 1+i, NextValueNo, Ty);
4200 else
4201 V = getValue(Record, 1+i, NextValueNo, Ty);
4202 BasicBlock *BB = getBasicBlock(Record[2+i]);
4203 if (!V || !BB)
4204 return error("Invalid record");
4205 PN->addIncoming(V, BB);
4206 }
4207 I = PN;
4208 break;
4209 }
4210
4211 case bitc::FUNC_CODE_INST_LANDINGPAD:
4212 case bitc::FUNC_CODE_INST_LANDINGPAD_OLD: {
4213 // LANDINGPAD: [ty, val, val, num, (id0,val0 ...)?]
4214 unsigned Idx = 0;
4215 if (BitCode == bitc::FUNC_CODE_INST_LANDINGPAD) {
4216 if (Record.size() < 3)
4217 return error("Invalid record");
4218 } else {
4219 assert(BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD)((BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD) ? static_cast
<void> (0) : __assert_fail ("BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD"
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4219, __PRETTY_FUNCTION__));
4220 if (Record.size() < 4)
4221 return error("Invalid record");
4222 }
4223 Type *Ty = getTypeByID(Record[Idx++]);
4224 if (!Ty)
4225 return error("Invalid record");
4226 if (BitCode == bitc::FUNC_CODE_INST_LANDINGPAD_OLD) {
4227 Value *PersFn = nullptr;
4228 if (getValueTypePair(Record, Idx, NextValueNo, PersFn))
4229 return error("Invalid record");
4230
4231 if (!F->hasPersonalityFn())
4232 F->setPersonalityFn(cast<Constant>(PersFn));
4233 else if (F->getPersonalityFn() != cast<Constant>(PersFn))
4234 return error("Personality function mismatch");
4235 }
4236
4237 bool IsCleanup = !!Record[Idx++];
4238 unsigned NumClauses = Record[Idx++];
4239 LandingPadInst *LP = LandingPadInst::Create(Ty, NumClauses);
4240 LP->setCleanup(IsCleanup);
4241 for (unsigned J = 0; J != NumClauses; ++J) {
4242 LandingPadInst::ClauseType CT =
4243 LandingPadInst::ClauseType(Record[Idx++]); (void)CT;
4244 Value *Val;
4245
4246 if (getValueTypePair(Record, Idx, NextValueNo, Val)) {
4247 delete LP;
4248 return error("Invalid record");
4249 }
4250
4251 assert((CT != LandingPadInst::Catch ||(((CT != LandingPadInst::Catch || !isa<ArrayType>(Val->
getType())) && "Catch clause has a invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Catch || !isa<ArrayType>(Val->getType())) && \"Catch clause has a invalid type!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4253, __PRETTY_FUNCTION__))
4252 !isa<ArrayType>(Val->getType())) &&(((CT != LandingPadInst::Catch || !isa<ArrayType>(Val->
getType())) && "Catch clause has a invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Catch || !isa<ArrayType>(Val->getType())) && \"Catch clause has a invalid type!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4253, __PRETTY_FUNCTION__))
4253 "Catch clause has a invalid type!")(((CT != LandingPadInst::Catch || !isa<ArrayType>(Val->
getType())) && "Catch clause has a invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Catch || !isa<ArrayType>(Val->getType())) && \"Catch clause has a invalid type!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4253, __PRETTY_FUNCTION__));
4254 assert((CT != LandingPadInst::Filter ||(((CT != LandingPadInst::Filter || isa<ArrayType>(Val->
getType())) && "Filter clause has invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Filter || isa<ArrayType>(Val->getType())) && \"Filter clause has invalid type!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4256, __PRETTY_FUNCTION__))
4255 isa<ArrayType>(Val->getType())) &&(((CT != LandingPadInst::Filter || isa<ArrayType>(Val->
getType())) && "Filter clause has invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Filter || isa<ArrayType>(Val->getType())) && \"Filter clause has invalid type!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4256, __PRETTY_FUNCTION__))
4256 "Filter clause has invalid type!")(((CT != LandingPadInst::Filter || isa<ArrayType>(Val->
getType())) && "Filter clause has invalid type!") ? static_cast
<void> (0) : __assert_fail ("(CT != LandingPadInst::Filter || isa<ArrayType>(Val->getType())) && \"Filter clause has invalid type!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4256, __PRETTY_FUNCTION__));
4257 LP->addClause(cast<Constant>(Val));
4258 }
4259
4260 I = LP;
4261 InstructionList.push_back(I);
4262 break;
4263 }
4264
4265 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, opty, op, align]
4266 if (Record.size() != 4)
4267 return error("Invalid record");
4268 uint64_t AlignRecord = Record[3];
4269 const uint64_t InAllocaMask = uint64_t(1) << 5;
4270 const uint64_t ExplicitTypeMask = uint64_t(1) << 6;
4271 // Reserve bit 7 for SwiftError flag.
4272 // const uint64_t SwiftErrorMask = uint64_t(1) << 7;
4273 const uint64_t FlagMask = InAllocaMask | ExplicitTypeMask;
4274 bool InAlloca = AlignRecord & InAllocaMask;
4275 Type *Ty = getTypeByID(Record[0]);
4276 if ((AlignRecord & ExplicitTypeMask) == 0) {
4277 auto *PTy = dyn_cast_or_null<PointerType>(Ty);
4278 if (!PTy)
4279 return error("Old-style alloca with a non-pointer type");
4280 Ty = PTy->getElementType();
4281 }
4282 Type *OpTy = getTypeByID(Record[1]);
4283 Value *Size = getFnValueByID(Record[2], OpTy);
4284 unsigned Align;
4285 if (std::error_code EC =
4286 parseAlignmentValue(AlignRecord & ~FlagMask, Align)) {
4287 return EC;
4288 }
4289 if (!Ty || !Size)
4290 return error("Invalid record");
4291 AllocaInst *AI = new AllocaInst(Ty, Size, Align);
4292 AI->setUsedWithInAlloca(InAlloca);
4293 I = AI;
4294 InstructionList.push_back(I);
4295 break;
4296 }
4297 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol]
4298 unsigned OpNum = 0;
4299 Value *Op;
4300 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
4301 (OpNum + 2 != Record.size() && OpNum + 3 != Record.size()))
4302 return error("Invalid record");
4303
4304 Type *Ty = nullptr;
4305 if (OpNum + 3 == Record.size())
4306 Ty = getTypeByID(Record[OpNum++]);
4307 if (std::error_code EC =
4308 typeCheckLoadStoreInst(DiagnosticHandler, Ty, Op->getType()))
4309 return EC;
4310 if (!Ty)
4311 Ty = cast<PointerType>(Op->getType())->getElementType();
4312
4313 unsigned Align;
4314 if (std::error_code EC = parseAlignmentValue(Record[OpNum], Align))
4315 return EC;
4316 I = new LoadInst(Ty, Op, "", Record[OpNum + 1], Align);
4317
4318 InstructionList.push_back(I);
4319 break;
4320 }
4321 case bitc::FUNC_CODE_INST_LOADATOMIC: {
4322 // LOADATOMIC: [opty, op, align, vol, ordering, synchscope]
4323 unsigned OpNum = 0;
4324 Value *Op;
4325 if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
4326 (OpNum + 4 != Record.size() && OpNum + 5 != Record.size()))
4327 return error("Invalid record");
4328
4329 Type *Ty = nullptr;
4330 if (OpNum + 5 == Record.size())
4331 Ty = getTypeByID(Record[OpNum++]);
4332 if (std::error_code EC =
4333 typeCheckLoadStoreInst(DiagnosticHandler, Ty, Op->getType()))
4334 return EC;
4335 if (!Ty)
4336 Ty = cast<PointerType>(Op->getType())->getElementType();
Value stored to 'Ty' is never read
4337
4338 AtomicOrdering Ordering = getDecodedOrdering(Record[OpNum + 2]);
4339 if (Ordering == NotAtomic || Ordering == Release ||
4340 Ordering == AcquireRelease)
4341 return error("Invalid record");
4342 if (Ordering != NotAtomic && Record[OpNum] == 0)
4343 return error("Invalid record");
4344 SynchronizationScope SynchScope = getDecodedSynchScope(Record[OpNum + 3]);
4345
4346 unsigned Align;
4347 if (std::error_code EC = parseAlignmentValue(Record[OpNum], Align))
4348 return EC;
4349 I = new LoadInst(Op, "", Record[OpNum+1], Align, Ordering, SynchScope);
4350
4351 InstructionList.push_back(I);
4352 break;
4353 }
4354 case bitc::FUNC_CODE_INST_STORE:
4355 case bitc::FUNC_CODE_INST_STORE_OLD: { // STORE2:[ptrty, ptr, val, align, vol]
4356 unsigned OpNum = 0;
4357 Value *Val, *Ptr;
4358 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
4359 (BitCode == bitc::FUNC_CODE_INST_STORE
4360 ? getValueTypePair(Record, OpNum, NextValueNo, Val)
4361 : popValue(Record, OpNum, NextValueNo,
4362 cast<PointerType>(Ptr->getType())->getElementType(),
4363 Val)) ||
4364 OpNum + 2 != Record.size())
4365 return error("Invalid record");
4366
4367 if (std::error_code EC = typeCheckLoadStoreInst(
4368 DiagnosticHandler, Val->getType(), Ptr->getType()))
4369 return EC;
4370 unsigned Align;
4371 if (std::error_code EC = parseAlignmentValue(Record[OpNum], Align))
4372 return EC;
4373 I = new StoreInst(Val, Ptr, Record[OpNum+1], Align);
4374 InstructionList.push_back(I);
4375 break;
4376 }
4377 case bitc::FUNC_CODE_INST_STOREATOMIC:
4378 case bitc::FUNC_CODE_INST_STOREATOMIC_OLD: {
4379 // STOREATOMIC: [ptrty, ptr, val, align, vol, ordering, synchscope]
4380 unsigned OpNum = 0;
4381 Value *Val, *Ptr;
4382 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
4383 (BitCode == bitc::FUNC_CODE_INST_STOREATOMIC
4384 ? getValueTypePair(Record, OpNum, NextValueNo, Val)
4385 : popValue(Record, OpNum, NextValueNo,
4386 cast<PointerType>(Ptr->getType())->getElementType(),
4387 Val)) ||
4388 OpNum + 4 != Record.size())
4389 return error("Invalid record");
4390
4391 if (std::error_code EC = typeCheckLoadStoreInst(
4392 DiagnosticHandler, Val->getType(), Ptr->getType()))
4393 return EC;
4394 AtomicOrdering Ordering = getDecodedOrdering(Record[OpNum + 2]);
4395 if (Ordering == NotAtomic || Ordering == Acquire ||
4396 Ordering == AcquireRelease)
4397 return error("Invalid record");
4398 SynchronizationScope SynchScope = getDecodedSynchScope(Record[OpNum + 3]);
4399 if (Ordering != NotAtomic && Record[OpNum] == 0)
4400 return error("Invalid record");
4401
4402 unsigned Align;
4403 if (std::error_code EC = parseAlignmentValue(Record[OpNum], Align))
4404 return EC;
4405 I = new StoreInst(Val, Ptr, Record[OpNum+1], Align, Ordering, SynchScope);
4406 InstructionList.push_back(I);
4407 break;
4408 }
4409 case bitc::FUNC_CODE_INST_CMPXCHG_OLD:
4410 case bitc::FUNC_CODE_INST_CMPXCHG: {
4411 // CMPXCHG:[ptrty, ptr, cmp, new, vol, successordering, synchscope,
4412 // failureordering?, isweak?]
4413 unsigned OpNum = 0;
4414 Value *Ptr, *Cmp, *New;
4415 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
4416 (BitCode == bitc::FUNC_CODE_INST_CMPXCHG
4417 ? getValueTypePair(Record, OpNum, NextValueNo, Cmp)
4418 : popValue(Record, OpNum, NextValueNo,
4419 cast<PointerType>(Ptr->getType())->getElementType(),
4420 Cmp)) ||
4421 popValue(Record, OpNum, NextValueNo, Cmp->getType(), New) ||
4422 Record.size() < OpNum + 3 || Record.size() > OpNum + 5)
4423 return error("Invalid record");
4424 AtomicOrdering SuccessOrdering = getDecodedOrdering(Record[OpNum + 1]);
4425 if (SuccessOrdering == NotAtomic || SuccessOrdering == Unordered)
4426 return error("Invalid record");
4427 SynchronizationScope SynchScope = getDecodedSynchScope(Record[OpNum + 2]);
4428
4429 if (std::error_code EC = typeCheckLoadStoreInst(
4430 DiagnosticHandler, Cmp->getType(), Ptr->getType()))
4431 return EC;
4432 AtomicOrdering FailureOrdering;
4433 if (Record.size() < 7)
4434 FailureOrdering =
4435 AtomicCmpXchgInst::getStrongestFailureOrdering(SuccessOrdering);
4436 else
4437 FailureOrdering = getDecodedOrdering(Record[OpNum + 3]);
4438
4439 I = new AtomicCmpXchgInst(Ptr, Cmp, New, SuccessOrdering, FailureOrdering,
4440 SynchScope);
4441 cast<AtomicCmpXchgInst>(I)->setVolatile(Record[OpNum]);
4442
4443 if (Record.size() < 8) {
4444 // Before weak cmpxchgs existed, the instruction simply returned the
4445 // value loaded from memory, so bitcode files from that era will be
4446 // expecting the first component of a modern cmpxchg.
4447 CurBB->getInstList().push_back(I);
4448 I = ExtractValueInst::Create(I, 0);
4449 } else {
4450 cast<AtomicCmpXchgInst>(I)->setWeak(Record[OpNum+4]);
4451 }
4452
4453 InstructionList.push_back(I);
4454 break;
4455 }
4456 case bitc::FUNC_CODE_INST_ATOMICRMW: {
4457 // ATOMICRMW:[ptrty, ptr, val, op, vol, ordering, synchscope]
4458 unsigned OpNum = 0;
4459 Value *Ptr, *Val;
4460 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) ||
4461 popValue(Record, OpNum, NextValueNo,
4462 cast<PointerType>(Ptr->getType())->getElementType(), Val) ||
4463 OpNum+4 != Record.size())
4464 return error("Invalid record");
4465 AtomicRMWInst::BinOp Operation = getDecodedRMWOperation(Record[OpNum]);
4466 if (Operation < AtomicRMWInst::FIRST_BINOP ||
4467 Operation > AtomicRMWInst::LAST_BINOP)
4468 return error("Invalid record");
4469 AtomicOrdering Ordering = getDecodedOrdering(Record[OpNum + 2]);
4470 if (Ordering == NotAtomic || Ordering == Unordered)
4471 return error("Invalid record");
4472 SynchronizationScope SynchScope = getDecodedSynchScope(Record[OpNum + 3]);
4473 I = new AtomicRMWInst(Operation, Ptr, Val, Ordering, SynchScope);
4474 cast<AtomicRMWInst>(I)->setVolatile(Record[OpNum+1]);
4475 InstructionList.push_back(I);
4476 break;
4477 }
4478 case bitc::FUNC_CODE_INST_FENCE: { // FENCE:[ordering, synchscope]
4479 if (2 != Record.size())
4480 return error("Invalid record");
4481 AtomicOrdering Ordering = getDecodedOrdering(Record[0]);
4482 if (Ordering == NotAtomic || Ordering == Unordered ||
4483 Ordering == Monotonic)
4484 return error("Invalid record");
4485 SynchronizationScope SynchScope = getDecodedSynchScope(Record[1]);
4486 I = new FenceInst(Context, Ordering, SynchScope);
4487 InstructionList.push_back(I);
4488 break;
4489 }
4490 case bitc::FUNC_CODE_INST_CALL: {
4491 // CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...]
4492 if (Record.size() < 3)
4493 return error("Invalid record");
4494
4495 unsigned OpNum = 0;
4496 AttributeSet PAL = getAttributes(Record[OpNum++]);
4497 unsigned CCInfo = Record[OpNum++];
4498
4499 FunctionType *FTy = nullptr;
4500 if (CCInfo >> 15 & 1 &&
4501 !(FTy = dyn_cast<FunctionType>(getTypeByID(Record[OpNum++]))))
4502 return error("Explicit call type is not a function type");
4503
4504 Value *Callee;
4505 if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
4506 return error("Invalid record");
4507
4508 PointerType *OpTy = dyn_cast<PointerType>(Callee->getType());
4509 if (!OpTy)
4510 return error("Callee is not a pointer type");
4511 if (!FTy) {
4512 FTy = dyn_cast<FunctionType>(OpTy->getElementType());
4513 if (!FTy)
4514 return error("Callee is not of pointer to function type");
4515 } else if (OpTy->getElementType() != FTy)
4516 return error("Explicit call type does not match pointee type of "
4517 "callee operand");
4518 if (Record.size() < FTy->getNumParams() + OpNum)
4519 return error("Insufficient operands to call");
4520
4521 SmallVector<Value*, 16> Args;
4522 // Read the fixed params.
4523 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
4524 if (FTy->getParamType(i)->isLabelTy())
4525 Args.push_back(getBasicBlock(Record[OpNum]));
4526 else
4527 Args.push_back(getValue(Record, OpNum, NextValueNo,
4528 FTy->getParamType(i)));
4529 if (!Args.back())
4530 return error("Invalid record");
4531 }
4532
4533 // Read type/value pairs for varargs params.
4534 if (!FTy->isVarArg()) {
4535 if (OpNum != Record.size())
4536 return error("Invalid record");
4537 } else {
4538 while (OpNum != Record.size()) {
4539 Value *Op;
4540 if (getValueTypePair(Record, OpNum, NextValueNo, Op))
4541 return error("Invalid record");
4542 Args.push_back(Op);
4543 }
4544 }
4545
4546 I = CallInst::Create(FTy, Callee, Args);
4547 InstructionList.push_back(I);
4548 cast<CallInst>(I)->setCallingConv(
4549 static_cast<CallingConv::ID>((~(1U << 14) & CCInfo) >> 1));
4550 CallInst::TailCallKind TCK = CallInst::TCK_None;
4551 if (CCInfo & 1)
4552 TCK = CallInst::TCK_Tail;
4553 if (CCInfo & (1 << 14))
4554 TCK = CallInst::TCK_MustTail;
4555 cast<CallInst>(I)->setTailCallKind(TCK);
4556 cast<CallInst>(I)->setAttributes(PAL);
4557 break;
4558 }
4559 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
4560 if (Record.size() < 3)
4561 return error("Invalid record");
4562 Type *OpTy = getTypeByID(Record[0]);
4563 Value *Op = getValue(Record, 1, NextValueNo, OpTy);
4564 Type *ResTy = getTypeByID(Record[2]);
4565 if (!OpTy || !Op || !ResTy)
4566 return error("Invalid record");
4567 I = new VAArgInst(Op, ResTy);
4568 InstructionList.push_back(I);
4569 break;
4570 }
4571 }
4572
4573 // Add instruction to end of current BB. If there is no current BB, reject
4574 // this file.
4575 if (!CurBB) {
4576 delete I;
4577 return error("Invalid instruction with no BB");
4578 }
4579 CurBB->getInstList().push_back(I);
4580
4581 // If this was a terminator instruction, move to the next block.
4582 if (isa<TerminatorInst>(I)) {
4583 ++CurBBNo;
4584 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : nullptr;
4585 }
4586
4587 // Non-void values get registered in the value table for future use.
4588 if (I && !I->getType()->isVoidTy())
4589 if (ValueList.assignValue(I, NextValueNo++))
4590 return error("Invalid forward reference");
4591 }
4592
4593OutOfRecordLoop:
4594
4595 // Check the function list for unresolved values.
4596 if (Argument *A = dyn_cast<Argument>(ValueList.back())) {
4597 if (!A->getParent()) {
4598 // We found at least one unresolved value. Nuke them all to avoid leaks.
4599 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){
4600 if ((A = dyn_cast_or_null<Argument>(ValueList[i])) && !A->getParent()) {
4601 A->replaceAllUsesWith(UndefValue::get(A->getType()));
4602 delete A;
4603 }
4604 }
4605 return error("Never resolved value found in function");
4606 }
4607 }
4608
4609 // FIXME: Check for unresolved forward-declared metadata references
4610 // and clean up leaks.
4611
4612 // Trim the value list down to the size it was before we parsed this function.
4613 ValueList.shrinkTo(ModuleValueListSize);
4614 MDValueList.shrinkTo(ModuleMDValueListSize);
4615 std::vector<BasicBlock*>().swap(FunctionBBs);
4616 return std::error_code();
4617}
4618
4619/// Find the function body in the bitcode stream
4620std::error_code BitcodeReader::findFunctionInStream(
4621 Function *F,
4622 DenseMap<Function *, uint64_t>::iterator DeferredFunctionInfoIterator) {
4623 while (DeferredFunctionInfoIterator->second == 0) {
4624 if (Stream.AtEndOfStream())
4625 return error("Could not find function in stream");
4626 // ParseModule will parse the next body in the stream and set its
4627 // position in the DeferredFunctionInfo map.
4628 if (std::error_code EC = parseModule(true))
4629 return EC;
4630 }
4631 return std::error_code();
4632}
4633
4634//===----------------------------------------------------------------------===//
4635// GVMaterializer implementation
4636//===----------------------------------------------------------------------===//
4637
4638void BitcodeReader::releaseBuffer() { Buffer.release(); }
4639
4640std::error_code BitcodeReader::materialize(GlobalValue *GV) {
4641 if (std::error_code EC = materializeMetadata())
4642 return EC;
4643
4644 Function *F = dyn_cast<Function>(GV);
4645 // If it's not a function or is already material, ignore the request.
4646 if (!F || !F->isMaterializable())
4647 return std::error_code();
4648
4649 DenseMap<Function*, uint64_t>::iterator DFII = DeferredFunctionInfo.find(F);
4650 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!")((DFII != DeferredFunctionInfo.end() && "Deferred function not found!"
) ? static_cast<void> (0) : __assert_fail ("DFII != DeferredFunctionInfo.end() && \"Deferred function not found!\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4650, __PRETTY_FUNCTION__));
4651 // If its position is recorded as 0, its body is somewhere in the stream
4652 // but we haven't seen it yet.
4653 if (DFII->second == 0)
4654 if (std::error_code EC = findFunctionInStream(F, DFII))
4655 return EC;
4656
4657 // Move the bit stream to the saved position of the deferred function body.
4658 Stream.JumpToBit(DFII->second);
4659
4660 if (std::error_code EC = parseFunctionBody(F))
4661 return EC;
4662 F->setIsMaterializable(false);
4663
4664 if (StripDebugInfo)
4665 stripDebugInfo(*F);
4666
4667 // Upgrade any old intrinsic calls in the function.
4668 for (auto &I : UpgradedIntrinsics) {
4669 for (auto UI = I.first->user_begin(), UE = I.first->user_end(); UI != UE;) {
4670 User *U = *UI;
4671 ++UI;
4672 if (CallInst *CI = dyn_cast<CallInst>(U))
4673 UpgradeIntrinsicCall(CI, I.second);
4674 }
4675 }
4676
4677 // Bring in any functions that this function forward-referenced via
4678 // blockaddresses.
4679 return materializeForwardReferencedFunctions();
4680}
4681
4682bool BitcodeReader::isDematerializable(const GlobalValue *GV) const {
4683 const Function *F = dyn_cast<Function>(GV);
4684 if (!F || F->isDeclaration())
4685 return false;
4686
4687 // Dematerializing F would leave dangling references that wouldn't be
4688 // reconnected on re-materialization.
4689 if (BlockAddressesTaken.count(F))
4690 return false;
4691
4692 return DeferredFunctionInfo.count(const_cast<Function*>(F));
4693}
4694
4695void BitcodeReader::dematerialize(GlobalValue *GV) {
4696 Function *F = dyn_cast<Function>(GV);
4697 // If this function isn't dematerializable, this is a noop.
4698 if (!F || !isDematerializable(F))
4699 return;
4700
4701 assert(DeferredFunctionInfo.count(F) && "No info to read function later?")((DeferredFunctionInfo.count(F) && "No info to read function later?"
) ? static_cast<void> (0) : __assert_fail ("DeferredFunctionInfo.count(F) && \"No info to read function later?\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4701, __PRETTY_FUNCTION__));
4702
4703 // Just forget the function body, we can remat it later.
4704 F->dropAllReferences();
4705 F->setIsMaterializable(true);
4706}
4707
4708std::error_code BitcodeReader::materializeModule(Module *M) {
4709 assert(M == TheModule &&((M == TheModule && "Can only Materialize the Module this BitcodeReader is attached to."
) ? static_cast<void> (0) : __assert_fail ("M == TheModule && \"Can only Materialize the Module this BitcodeReader is attached to.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4710, __PRETTY_FUNCTION__))
4710 "Can only Materialize the Module this BitcodeReader is attached to.")((M == TheModule && "Can only Materialize the Module this BitcodeReader is attached to."
) ? static_cast<void> (0) : __assert_fail ("M == TheModule && \"Can only Materialize the Module this BitcodeReader is attached to.\""
, "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4710, __PRETTY_FUNCTION__));
4711
4712 if (std::error_code EC = materializeMetadata())
4713 return EC;
4714
4715 // Promise to materialize all forward references.
4716 WillMaterializeAllForwardRefs = true;
4717
4718 // Iterate over the module, deserializing any functions that are still on
4719 // disk.
4720 for (Module::iterator F = TheModule->begin(), E = TheModule->end();
4721 F != E; ++F) {
4722 if (std::error_code EC = materialize(F))
4723 return EC;
4724 }
4725 // At this point, if there are any function bodies, the current bit is
4726 // pointing to the END_BLOCK record after them. Now make sure the rest
4727 // of the bits in the module have been read.
4728 if (NextUnreadBit)
4729 parseModule(true);
4730
4731 // Check that all block address forward references got resolved (as we
4732 // promised above).
4733 if (!BasicBlockFwdRefs.empty())
4734 return error("Never resolved function from blockaddress");
4735
4736 // Upgrade any intrinsic calls that slipped through (should not happen!) and
4737 // delete the old functions to clean up. We can't do this unless the entire
4738 // module is materialized because there could always be another function body
4739 // with calls to the old function.
4740 for (auto &I : UpgradedIntrinsics) {
4741 for (auto *U : I.first->users()) {
4742 if (CallInst *CI = dyn_cast<CallInst>(U))
4743 UpgradeIntrinsicCall(CI, I.second);
4744 }
4745 if (!I.first->use_empty())
4746 I.first->replaceAllUsesWith(I.second);
4747 I.first->eraseFromParent();
4748 }
4749 UpgradedIntrinsics.clear();
4750
4751 for (unsigned I = 0, E = InstsWithTBAATag.size(); I < E; I++)
4752 UpgradeInstWithTBAATag(InstsWithTBAATag[I]);
4753
4754 UpgradeDebugInfo(*M);
4755 return std::error_code();
4756}
4757
4758std::vector<StructType *> BitcodeReader::getIdentifiedStructTypes() const {
4759 return IdentifiedStructTypes;
4760}
4761
4762std::error_code
4763BitcodeReader::initStream(std::unique_ptr<DataStreamer> Streamer) {
4764 if (Streamer)
4765 return initLazyStream(std::move(Streamer));
4766 return initStreamFromBuffer();
4767}
4768
4769std::error_code BitcodeReader::initStreamFromBuffer() {
4770 const unsigned char *BufPtr = (const unsigned char*)Buffer->getBufferStart();
4771 const unsigned char *BufEnd = BufPtr+Buffer->getBufferSize();
4772
4773 if (Buffer->getBufferSize() & 3)
4774 return error("Invalid bitcode signature");
4775
4776 // If we have a wrapper header, parse it and ignore the non-bc file contents.
4777 // The magic number is 0x0B17C0DE stored in little endian.
4778 if (isBitcodeWrapper(BufPtr, BufEnd))
4779 if (SkipBitcodeWrapperHeader(BufPtr, BufEnd, true))
4780 return error("Invalid bitcode wrapper header");
4781
4782 StreamFile.reset(new BitstreamReader(BufPtr, BufEnd));
4783 Stream.init(&*StreamFile);
4784
4785 return std::error_code();
4786}
4787
4788std::error_code
4789BitcodeReader::initLazyStream(std::unique_ptr<DataStreamer> Streamer) {
4790 // Check and strip off the bitcode wrapper; BitstreamReader expects never to
4791 // see it.
4792 auto OwnedBytes =
4793 llvm::make_unique<StreamingMemoryObject>(std::move(Streamer));
4794 StreamingMemoryObject &Bytes = *OwnedBytes;
4795 StreamFile = llvm::make_unique<BitstreamReader>(std::move(OwnedBytes));
4796 Stream.init(&*StreamFile);
4797
4798 unsigned char buf[16];
4799 if (Bytes.readBytes(buf, 16, 0) != 16)
4800 return error("Invalid bitcode signature");
4801
4802 if (!isBitcode(buf, buf + 16))
4803 return error("Invalid bitcode signature");
4804
4805 if (isBitcodeWrapper(buf, buf + 4)) {
4806 const unsigned char *bitcodeStart = buf;
4807 const unsigned char *bitcodeEnd = buf + 16;
4808 SkipBitcodeWrapperHeader(bitcodeStart, bitcodeEnd, false);
4809 Bytes.dropLeadingBytes(bitcodeStart - buf);
4810 Bytes.setKnownObjectSize(bitcodeEnd - bitcodeStart);
4811 }
4812 return std::error_code();
4813}
4814
4815namespace {
4816class BitcodeErrorCategoryType : public std::error_category {
4817 const char *name() const LLVM_NOEXCEPTnoexcept override {
4818 return "llvm.bitcode";
4819 }
4820 std::string message(int IE) const override {
4821 BitcodeError E = static_cast<BitcodeError>(IE);
4822 switch (E) {
4823 case BitcodeError::InvalidBitcodeSignature:
4824 return "Invalid bitcode signature";
4825 case BitcodeError::CorruptedBitcode:
4826 return "Corrupted bitcode";
4827 }
4828 llvm_unreachable("Unknown error type!")::llvm::llvm_unreachable_internal("Unknown error type!", "/tmp/buildd/llvm-toolchain-snapshot-3.8~svn246424/lib/Bitcode/Reader/BitcodeReader.cpp"
, 4828);
4829 }
4830};
4831}
4832
4833static ManagedStatic<BitcodeErrorCategoryType> ErrorCategory;
4834
4835const std::error_category &llvm::BitcodeErrorCategory() {
4836 return *ErrorCategory;
4837}
4838
4839//===----------------------------------------------------------------------===//
4840// External interface
4841//===----------------------------------------------------------------------===//
4842
4843static ErrorOr<std::unique_ptr<Module>>
4844getBitcodeModuleImpl(std::unique_ptr<DataStreamer> Streamer, StringRef Name,
4845 BitcodeReader *R, LLVMContext &Context,
4846 bool MaterializeAll, bool ShouldLazyLoadMetadata) {
4847 std::unique_ptr<Module> M = make_unique<Module>(Name, Context);
4848 M->setMaterializer(R);
4849
4850 auto cleanupOnError = [&](std::error_code EC) {
4851 R->releaseBuffer(); // Never take ownership on error.
4852 return EC;
4853 };
4854
4855 // Delay parsing Metadata if ShouldLazyLoadMetadata is true.
4856 if (std::error_code EC = R->parseBitcodeInto(std::move(Streamer), M.get(),
4857 ShouldLazyLoadMetadata))
4858 return cleanupOnError(EC);
4859
4860 if (MaterializeAll) {
4861 // Read in the entire module, and destroy the BitcodeReader.
4862 if (std::error_code EC = M->materializeAllPermanently())
4863 return cleanupOnError(EC);
4864 } else {
4865 // Resolve forward references from blockaddresses.
4866 if (std::error_code EC = R->materializeForwardReferencedFunctions())
4867 return cleanupOnError(EC);
4868 }
4869 return std::move(M);
4870}
4871
4872/// \brief Get a lazy one-at-time loading module from bitcode.
4873///
4874/// This isn't always used in a lazy context. In particular, it's also used by
4875/// \a parseBitcodeFile(). If this is truly lazy, then we need to eagerly pull
4876/// in forward-referenced functions from block address references.
4877///
4878/// \param[in] MaterializeAll Set to \c true if we should materialize
4879/// everything.
4880static ErrorOr<std::unique_ptr<Module>>
4881getLazyBitcodeModuleImpl(std::unique_ptr<MemoryBuffer> &&Buffer,
4882 LLVMContext &Context, bool MaterializeAll,
4883 DiagnosticHandlerFunction DiagnosticHandler,
4884 bool ShouldLazyLoadMetadata = false) {
4885 BitcodeReader *R =
4886 new BitcodeReader(Buffer.get(), Context, DiagnosticHandler);
4887
4888 ErrorOr<std::unique_ptr<Module>> Ret =
4889 getBitcodeModuleImpl(nullptr, Buffer->getBufferIdentifier(), R, Context,
4890 MaterializeAll, ShouldLazyLoadMetadata);
4891 if (!Ret)
4892 return Ret;
4893
4894 Buffer.release(); // The BitcodeReader owns it now.
4895 return Ret;
4896}
4897
4898ErrorOr<std::unique_ptr<Module>> llvm::getLazyBitcodeModule(
4899 std::unique_ptr<MemoryBuffer> &&Buffer, LLVMContext &Context,
4900 DiagnosticHandlerFunction DiagnosticHandler, bool ShouldLazyLoadMetadata) {
4901 return getLazyBitcodeModuleImpl(std::move(Buffer), Context, false,
4902 DiagnosticHandler, ShouldLazyLoadMetadata);
4903}
4904
4905ErrorOr<std::unique_ptr<Module>> llvm::getStreamedBitcodeModule(
4906 StringRef Name, std::unique_ptr<DataStreamer> Streamer,
4907 LLVMContext &Context, DiagnosticHandlerFunction DiagnosticHandler) {
4908 std::unique_ptr<Module> M = make_unique<Module>(Name, Context);
4909 BitcodeReader *R = new BitcodeReader(Context, DiagnosticHandler);
4910
4911 return getBitcodeModuleImpl(std::move(Streamer), Name, R, Context, false,
4912 false);
4913}
4914
4915ErrorOr<std::unique_ptr<Module>>
4916llvm::parseBitcodeFile(MemoryBufferRef Buffer, LLVMContext &Context,
4917 DiagnosticHandlerFunction DiagnosticHandler) {
4918 std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Buffer, false);
4919 return getLazyBitcodeModuleImpl(std::move(Buf), Context, true,
4920 DiagnosticHandler);
4921 // TODO: Restore the use-lists to the in-memory state when the bitcode was
4922 // written. We must defer until the Module has been fully materialized.
4923}
4924
4925std::string
4926llvm::getBitcodeTargetTriple(MemoryBufferRef Buffer, LLVMContext &Context,
4927 DiagnosticHandlerFunction DiagnosticHandler) {
4928 std::unique_ptr<MemoryBuffer> Buf = MemoryBuffer::getMemBuffer(Buffer, false);
4929 auto R = llvm::make_unique<BitcodeReader>(Buf.release(), Context,
4930 DiagnosticHandler);
4931 ErrorOr<std::string> Triple = R->parseTriple();
4932 if (Triple.getError())
4933 return "";
4934 return Triple.get();
4935}