1 //===- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // Bitcode writer implementation.
11 //===----------------------------------------------------------------------===//
13 #include "llvm/Bitcode/BitcodeWriter.h"
14 #include "ValueEnumerator.h"
15 #include "llvm/ADT/APFloat.h"
16 #include "llvm/ADT/APInt.h"
17 #include "llvm/ADT/ArrayRef.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/ADT/None.h"
20 #include "llvm/ADT/Optional.h"
21 #include "llvm/ADT/STLExtras.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/ADT/SmallVector.h"
24 #include "llvm/ADT/StringMap.h"
25 #include "llvm/ADT/StringRef.h"
26 #include "llvm/ADT/Triple.h"
27 #include "llvm/Bitcode/BitCodes.h"
28 #include "llvm/Bitcode/BitstreamWriter.h"
29 #include "llvm/Bitcode/LLVMBitCodes.h"
30 #include "llvm/Config/llvm-config.h"
31 #include "llvm/IR/Attributes.h"
32 #include "llvm/IR/BasicBlock.h"
33 #include "llvm/IR/CallSite.h"
34 #include "llvm/IR/Comdat.h"
35 #include "llvm/IR/Constant.h"
36 #include "llvm/IR/Constants.h"
37 #include "llvm/IR/DebugInfoMetadata.h"
38 #include "llvm/IR/DebugLoc.h"
39 #include "llvm/IR/DerivedTypes.h"
40 #include "llvm/IR/Function.h"
41 #include "llvm/IR/GlobalAlias.h"
42 #include "llvm/IR/GlobalIFunc.h"
43 #include "llvm/IR/GlobalObject.h"
44 #include "llvm/IR/GlobalValue.h"
45 #include "llvm/IR/GlobalVariable.h"
46 #include "llvm/IR/InlineAsm.h"
47 #include "llvm/IR/InstrTypes.h"
48 #include "llvm/IR/Instruction.h"
49 #include "llvm/IR/Instructions.h"
50 #include "llvm/IR/LLVMContext.h"
51 #include "llvm/IR/Metadata.h"
52 #include "llvm/IR/Module.h"
53 #include "llvm/IR/ModuleSummaryIndex.h"
54 #include "llvm/IR/Operator.h"
55 #include "llvm/IR/Type.h"
56 #include "llvm/IR/UseListOrder.h"
57 #include "llvm/IR/Value.h"
58 #include "llvm/IR/ValueSymbolTable.h"
59 #include "llvm/MC/StringTableBuilder.h"
60 #include "llvm/Object/IRSymtab.h"
61 #include "llvm/Support/AtomicOrdering.h"
62 #include "llvm/Support/Casting.h"
63 #include "llvm/Support/CommandLine.h"
64 #include "llvm/Support/Endian.h"
65 #include "llvm/Support/Error.h"
66 #include "llvm/Support/ErrorHandling.h"
67 #include "llvm/Support/MathExtras.h"
68 #include "llvm/Support/SHA1.h"
69 #include "llvm/Support/TargetRegistry.h"
70 #include "llvm/Support/raw_ostream.h"
84 static cl::opt<unsigned>
85 IndexThreshold("bitcode-mdindex-threshold", cl::Hidden, cl::init(25),
86 cl::desc("Number of metadatas above which we emit an index "
87 "to enable lazy-loading"));
89 cl::opt<bool> WriteRelBFToSummary(
90 "write-relbf-to-summary", cl::Hidden, cl::init(false),
91 cl::desc("Write relative block frequency to function summary "));
93 extern FunctionSummary::ForceSummaryHotnessType ForceSummaryEdgesCold;
97 /// These are manifest constants used by the bitcode writer. They do not need to
98 /// be kept in sync with the reader, but need to be consistent within this file.
100 // VALUE_SYMTAB_BLOCK abbrev id's.
101 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
104 VST_BBENTRY_6_ABBREV,
106 // CONSTANTS_BLOCK abbrev id's.
107 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
108 CONSTANTS_INTEGER_ABBREV,
109 CONSTANTS_CE_CAST_Abbrev,
110 CONSTANTS_NULL_Abbrev,
112 // FUNCTION_BLOCK abbrev id's.
113 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
114 FUNCTION_INST_UNOP_ABBREV,
115 FUNCTION_INST_UNOP_FLAGS_ABBREV,
116 FUNCTION_INST_BINOP_ABBREV,
117 FUNCTION_INST_BINOP_FLAGS_ABBREV,
118 FUNCTION_INST_CAST_ABBREV,
119 FUNCTION_INST_RET_VOID_ABBREV,
120 FUNCTION_INST_RET_VAL_ABBREV,
121 FUNCTION_INST_UNREACHABLE_ABBREV,
122 FUNCTION_INST_GEP_ABBREV,
125 /// Abstract class to manage the bitcode writing, subclassed for each bitcode
127 class BitcodeWriterBase {
129 /// The stream created and owned by the client.
130 BitstreamWriter &Stream;
132 StringTableBuilder &StrtabBuilder;
135 /// Constructs a BitcodeWriterBase object that writes to the provided
137 BitcodeWriterBase(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder)
138 : Stream(Stream), StrtabBuilder(StrtabBuilder) {}
141 void writeBitcodeHeader();
142 void writeModuleVersion();
145 void BitcodeWriterBase::writeModuleVersion() {
146 // VERSION: [version#]
147 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, ArrayRef<uint64_t>{2});
150 /// Base class to manage the module bitcode writing, currently subclassed for
151 /// ModuleBitcodeWriter and ThinLinkBitcodeWriter.
152 class ModuleBitcodeWriterBase : public BitcodeWriterBase {
154 /// The Module to write to bitcode.
157 /// Enumerates ids for all values in the module.
160 /// Optional per-module index to write for ThinLTO.
161 const ModuleSummaryIndex *Index;
163 /// Map that holds the correspondence between GUIDs in the summary index,
164 /// that came from indirect call profiles, and a value id generated by this
165 /// class to use in the VST and summary block records.
166 std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
168 /// Tracks the last value id recorded in the GUIDToValueMap.
169 unsigned GlobalValueId;
171 /// Saves the offset of the VSTOffset record that must eventually be
172 /// backpatched with the offset of the actual VST.
173 uint64_t VSTOffsetPlaceholder = 0;
176 /// Constructs a ModuleBitcodeWriterBase object for the given Module,
177 /// writing to the provided \p Buffer.
178 ModuleBitcodeWriterBase(const Module &M, StringTableBuilder &StrtabBuilder,
179 BitstreamWriter &Stream,
180 bool ShouldPreserveUseListOrder,
181 const ModuleSummaryIndex *Index)
182 : BitcodeWriterBase(Stream, StrtabBuilder), M(M),
183 VE(M, ShouldPreserveUseListOrder), Index(Index) {
184 // Assign ValueIds to any callee values in the index that came from
185 // indirect call profiles and were recorded as a GUID not a Value*
186 // (which would have been assigned an ID by the ValueEnumerator).
187 // The starting ValueId is just after the number of values in the
188 // ValueEnumerator, so that they can be emitted in the VST.
189 GlobalValueId = VE.getValues().size();
192 for (const auto &GUIDSummaryLists : *Index)
193 // Examine all summaries for this GUID.
194 for (auto &Summary : GUIDSummaryLists.second.SummaryList)
195 if (auto FS = dyn_cast<FunctionSummary>(Summary.get()))
196 // For each call in the function summary, see if the call
197 // is to a GUID (which means it is for an indirect call,
198 // otherwise we would have a Value for it). If so, synthesize
200 for (auto &CallEdge : FS->calls())
201 if (!CallEdge.first.haveGVs() || !CallEdge.first.getValue())
202 assignValueId(CallEdge.first.getGUID());
206 void writePerModuleGlobalValueSummary();
209 void writePerModuleFunctionSummaryRecord(SmallVector<uint64_t, 64> &NameVals,
210 GlobalValueSummary *Summary,
212 unsigned FSCallsAbbrev,
213 unsigned FSCallsProfileAbbrev,
215 void writeModuleLevelReferences(const GlobalVariable &V,
216 SmallVector<uint64_t, 64> &NameVals,
217 unsigned FSModRefsAbbrev,
218 unsigned FSModVTableRefsAbbrev);
220 void assignValueId(GlobalValue::GUID ValGUID) {
221 GUIDToValueIdMap[ValGUID] = ++GlobalValueId;
224 unsigned getValueId(GlobalValue::GUID ValGUID) {
225 const auto &VMI = GUIDToValueIdMap.find(ValGUID);
226 // Expect that any GUID value had a value Id assigned by an
227 // earlier call to assignValueId.
228 assert(VMI != GUIDToValueIdMap.end() &&
229 "GUID does not have assigned value Id");
233 // Helper to get the valueId for the type of value recorded in VI.
234 unsigned getValueId(ValueInfo VI) {
235 if (!VI.haveGVs() || !VI.getValue())
236 return getValueId(VI.getGUID());
237 return VE.getValueID(VI.getValue());
240 std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
243 /// Class to manage the bitcode writing for a module.
244 class ModuleBitcodeWriter : public ModuleBitcodeWriterBase {
245 /// Pointer to the buffer allocated by caller for bitcode writing.
246 const SmallVectorImpl<char> &Buffer;
248 /// True if a module hash record should be written.
251 /// If non-null, when GenerateHash is true, the resulting hash is written
257 /// The start bit of the identification block.
258 uint64_t BitcodeStartBit;
261 /// Constructs a ModuleBitcodeWriter object for the given Module,
262 /// writing to the provided \p Buffer.
263 ModuleBitcodeWriter(const Module &M, SmallVectorImpl<char> &Buffer,
264 StringTableBuilder &StrtabBuilder,
265 BitstreamWriter &Stream, bool ShouldPreserveUseListOrder,
266 const ModuleSummaryIndex *Index, bool GenerateHash,
267 ModuleHash *ModHash = nullptr)
268 : ModuleBitcodeWriterBase(M, StrtabBuilder, Stream,
269 ShouldPreserveUseListOrder, Index),
270 Buffer(Buffer), GenerateHash(GenerateHash), ModHash(ModHash),
271 BitcodeStartBit(Stream.GetCurrentBitNo()) {}
273 /// Emit the current module to the bitstream.
277 uint64_t bitcodeStartBit() { return BitcodeStartBit; }
279 size_t addToStrtab(StringRef Str);
281 void writeAttributeGroupTable();
282 void writeAttributeTable();
283 void writeTypeTable();
285 void writeValueSymbolTableForwardDecl();
286 void writeModuleInfo();
287 void writeValueAsMetadata(const ValueAsMetadata *MD,
288 SmallVectorImpl<uint64_t> &Record);
289 void writeMDTuple(const MDTuple *N, SmallVectorImpl<uint64_t> &Record,
291 unsigned createDILocationAbbrev();
292 void writeDILocation(const DILocation *N, SmallVectorImpl<uint64_t> &Record,
294 unsigned createGenericDINodeAbbrev();
295 void writeGenericDINode(const GenericDINode *N,
296 SmallVectorImpl<uint64_t> &Record, unsigned &Abbrev);
297 void writeDISubrange(const DISubrange *N, SmallVectorImpl<uint64_t> &Record,
299 void writeDIEnumerator(const DIEnumerator *N,
300 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
301 void writeDIBasicType(const DIBasicType *N, SmallVectorImpl<uint64_t> &Record,
303 void writeDIDerivedType(const DIDerivedType *N,
304 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
305 void writeDICompositeType(const DICompositeType *N,
306 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
307 void writeDISubroutineType(const DISubroutineType *N,
308 SmallVectorImpl<uint64_t> &Record,
310 void writeDIFile(const DIFile *N, SmallVectorImpl<uint64_t> &Record,
312 void writeDICompileUnit(const DICompileUnit *N,
313 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
314 void writeDISubprogram(const DISubprogram *N,
315 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
316 void writeDILexicalBlock(const DILexicalBlock *N,
317 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
318 void writeDILexicalBlockFile(const DILexicalBlockFile *N,
319 SmallVectorImpl<uint64_t> &Record,
321 void writeDICommonBlock(const DICommonBlock *N,
322 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
323 void writeDINamespace(const DINamespace *N, SmallVectorImpl<uint64_t> &Record,
325 void writeDIMacro(const DIMacro *N, SmallVectorImpl<uint64_t> &Record,
327 void writeDIMacroFile(const DIMacroFile *N, SmallVectorImpl<uint64_t> &Record,
329 void writeDIModule(const DIModule *N, SmallVectorImpl<uint64_t> &Record,
331 void writeDITemplateTypeParameter(const DITemplateTypeParameter *N,
332 SmallVectorImpl<uint64_t> &Record,
334 void writeDITemplateValueParameter(const DITemplateValueParameter *N,
335 SmallVectorImpl<uint64_t> &Record,
337 void writeDIGlobalVariable(const DIGlobalVariable *N,
338 SmallVectorImpl<uint64_t> &Record,
340 void writeDILocalVariable(const DILocalVariable *N,
341 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
342 void writeDILabel(const DILabel *N,
343 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
344 void writeDIExpression(const DIExpression *N,
345 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
346 void writeDIGlobalVariableExpression(const DIGlobalVariableExpression *N,
347 SmallVectorImpl<uint64_t> &Record,
349 void writeDIObjCProperty(const DIObjCProperty *N,
350 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
351 void writeDIImportedEntity(const DIImportedEntity *N,
352 SmallVectorImpl<uint64_t> &Record,
354 unsigned createNamedMetadataAbbrev();
355 void writeNamedMetadata(SmallVectorImpl<uint64_t> &Record);
356 unsigned createMetadataStringsAbbrev();
357 void writeMetadataStrings(ArrayRef<const Metadata *> Strings,
358 SmallVectorImpl<uint64_t> &Record);
359 void writeMetadataRecords(ArrayRef<const Metadata *> MDs,
360 SmallVectorImpl<uint64_t> &Record,
361 std::vector<unsigned> *MDAbbrevs = nullptr,
362 std::vector<uint64_t> *IndexPos = nullptr);
363 void writeModuleMetadata();
364 void writeFunctionMetadata(const Function &F);
365 void writeFunctionMetadataAttachment(const Function &F);
366 void writeGlobalVariableMetadataAttachment(const GlobalVariable &GV);
367 void pushGlobalMetadataAttachment(SmallVectorImpl<uint64_t> &Record,
368 const GlobalObject &GO);
369 void writeModuleMetadataKinds();
370 void writeOperandBundleTags();
371 void writeSyncScopeNames();
372 void writeConstants(unsigned FirstVal, unsigned LastVal, bool isGlobal);
373 void writeModuleConstants();
374 bool pushValueAndType(const Value *V, unsigned InstID,
375 SmallVectorImpl<unsigned> &Vals);
376 void writeOperandBundles(ImmutableCallSite CS, unsigned InstID);
377 void pushValue(const Value *V, unsigned InstID,
378 SmallVectorImpl<unsigned> &Vals);
379 void pushValueSigned(const Value *V, unsigned InstID,
380 SmallVectorImpl<uint64_t> &Vals);
381 void writeInstruction(const Instruction &I, unsigned InstID,
382 SmallVectorImpl<unsigned> &Vals);
383 void writeFunctionLevelValueSymbolTable(const ValueSymbolTable &VST);
384 void writeGlobalValueSymbolTable(
385 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
386 void writeUseList(UseListOrder &&Order);
387 void writeUseListBlock(const Function *F);
389 writeFunction(const Function &F,
390 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
391 void writeBlockInfo();
392 void writeModuleHash(size_t BlockStartPos);
394 unsigned getEncodedSyncScopeID(SyncScope::ID SSID) {
395 return unsigned(SSID);
399 /// Class to manage the bitcode writing for a combined index.
400 class IndexBitcodeWriter : public BitcodeWriterBase {
401 /// The combined index to write to bitcode.
402 const ModuleSummaryIndex &Index;
404 /// When writing a subset of the index for distributed backends, client
405 /// provides a map of modules to the corresponding GUIDs/summaries to write.
406 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex;
408 /// Map that holds the correspondence between the GUID used in the combined
409 /// index and a value id generated by this class to use in references.
410 std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
412 /// Tracks the last value id recorded in the GUIDToValueMap.
413 unsigned GlobalValueId = 0;
416 /// Constructs a IndexBitcodeWriter object for the given combined index,
417 /// writing to the provided \p Buffer. When writing a subset of the index
418 /// for a distributed backend, provide a \p ModuleToSummariesForIndex map.
419 IndexBitcodeWriter(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder,
420 const ModuleSummaryIndex &Index,
421 const std::map<std::string, GVSummaryMapTy>
422 *ModuleToSummariesForIndex = nullptr)
423 : BitcodeWriterBase(Stream, StrtabBuilder), Index(Index),
424 ModuleToSummariesForIndex(ModuleToSummariesForIndex) {
425 // Assign unique value ids to all summaries to be written, for use
426 // in writing out the call graph edges. Save the mapping from GUID
427 // to the new global value id to use when writing those edges, which
428 // are currently saved in the index in terms of GUID.
429 forEachSummary([&](GVInfo I, bool) {
430 GUIDToValueIdMap[I.first] = ++GlobalValueId;
434 /// The below iterator returns the GUID and associated summary.
435 using GVInfo = std::pair<GlobalValue::GUID, GlobalValueSummary *>;
437 /// Calls the callback for each value GUID and summary to be written to
438 /// bitcode. This hides the details of whether they are being pulled from the
439 /// entire index or just those in a provided ModuleToSummariesForIndex map.
440 template<typename Functor>
441 void forEachSummary(Functor Callback) {
442 if (ModuleToSummariesForIndex) {
443 for (auto &M : *ModuleToSummariesForIndex)
444 for (auto &Summary : M.second) {
445 Callback(Summary, false);
446 // Ensure aliasee is handled, e.g. for assigning a valueId,
447 // even if we are not importing the aliasee directly (the
448 // imported alias will contain a copy of aliasee).
449 if (auto *AS = dyn_cast<AliasSummary>(Summary.getSecond()))
450 Callback({AS->getAliaseeGUID(), &AS->getAliasee()}, true);
453 for (auto &Summaries : Index)
454 for (auto &Summary : Summaries.second.SummaryList)
455 Callback({Summaries.first, Summary.get()}, false);
459 /// Calls the callback for each entry in the modulePaths StringMap that
460 /// should be written to the module path string table. This hides the details
461 /// of whether they are being pulled from the entire index or just those in a
462 /// provided ModuleToSummariesForIndex map.
463 template <typename Functor> void forEachModule(Functor Callback) {
464 if (ModuleToSummariesForIndex) {
465 for (const auto &M : *ModuleToSummariesForIndex) {
466 const auto &MPI = Index.modulePaths().find(M.first);
467 if (MPI == Index.modulePaths().end()) {
468 // This should only happen if the bitcode file was empty, in which
469 // case we shouldn't be importing (the ModuleToSummariesForIndex
470 // would only include the module we are writing and index for).
471 assert(ModuleToSummariesForIndex->size() == 1);
477 for (const auto &MPSE : Index.modulePaths())
482 /// Main entry point for writing a combined index to bitcode.
486 void writeModStrings();
487 void writeCombinedGlobalValueSummary();
489 Optional<unsigned> getValueId(GlobalValue::GUID ValGUID) {
490 auto VMI = GUIDToValueIdMap.find(ValGUID);
491 if (VMI == GUIDToValueIdMap.end())
496 std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
499 } // end anonymous namespace
501 static unsigned getEncodedCastOpcode(unsigned Opcode) {
503 default: llvm_unreachable("Unknown cast instruction!");
504 case Instruction::Trunc : return bitc::CAST_TRUNC;
505 case Instruction::ZExt : return bitc::CAST_ZEXT;
506 case Instruction::SExt : return bitc::CAST_SEXT;
507 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
508 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
509 case Instruction::UIToFP : return bitc::CAST_UITOFP;
510 case Instruction::SIToFP : return bitc::CAST_SITOFP;
511 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
512 case Instruction::FPExt : return bitc::CAST_FPEXT;
513 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
514 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
515 case Instruction::BitCast : return bitc::CAST_BITCAST;
516 case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST;
520 static unsigned getEncodedUnaryOpcode(unsigned Opcode) {
522 default: llvm_unreachable("Unknown binary instruction!");
523 case Instruction::FNeg: return bitc::UNOP_NEG;
527 static unsigned getEncodedBinaryOpcode(unsigned Opcode) {
529 default: llvm_unreachable("Unknown binary instruction!");
530 case Instruction::Add:
531 case Instruction::FAdd: return bitc::BINOP_ADD;
532 case Instruction::Sub:
533 case Instruction::FSub: return bitc::BINOP_SUB;
534 case Instruction::Mul:
535 case Instruction::FMul: return bitc::BINOP_MUL;
536 case Instruction::UDiv: return bitc::BINOP_UDIV;
537 case Instruction::FDiv:
538 case Instruction::SDiv: return bitc::BINOP_SDIV;
539 case Instruction::URem: return bitc::BINOP_UREM;
540 case Instruction::FRem:
541 case Instruction::SRem: return bitc::BINOP_SREM;
542 case Instruction::Shl: return bitc::BINOP_SHL;
543 case Instruction::LShr: return bitc::BINOP_LSHR;
544 case Instruction::AShr: return bitc::BINOP_ASHR;
545 case Instruction::And: return bitc::BINOP_AND;
546 case Instruction::Or: return bitc::BINOP_OR;
547 case Instruction::Xor: return bitc::BINOP_XOR;
551 static unsigned getEncodedRMWOperation(AtomicRMWInst::BinOp Op) {
553 default: llvm_unreachable("Unknown RMW operation!");
554 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG;
555 case AtomicRMWInst::Add: return bitc::RMW_ADD;
556 case AtomicRMWInst::Sub: return bitc::RMW_SUB;
557 case AtomicRMWInst::And: return bitc::RMW_AND;
558 case AtomicRMWInst::Nand: return bitc::RMW_NAND;
559 case AtomicRMWInst::Or: return bitc::RMW_OR;
560 case AtomicRMWInst::Xor: return bitc::RMW_XOR;
561 case AtomicRMWInst::Max: return bitc::RMW_MAX;
562 case AtomicRMWInst::Min: return bitc::RMW_MIN;
563 case AtomicRMWInst::UMax: return bitc::RMW_UMAX;
564 case AtomicRMWInst::UMin: return bitc::RMW_UMIN;
565 case AtomicRMWInst::FAdd: return bitc::RMW_FADD;
566 case AtomicRMWInst::FSub: return bitc::RMW_FSUB;
570 static unsigned getEncodedOrdering(AtomicOrdering Ordering) {
572 case AtomicOrdering::NotAtomic: return bitc::ORDERING_NOTATOMIC;
573 case AtomicOrdering::Unordered: return bitc::ORDERING_UNORDERED;
574 case AtomicOrdering::Monotonic: return bitc::ORDERING_MONOTONIC;
575 case AtomicOrdering::Acquire: return bitc::ORDERING_ACQUIRE;
576 case AtomicOrdering::Release: return bitc::ORDERING_RELEASE;
577 case AtomicOrdering::AcquireRelease: return bitc::ORDERING_ACQREL;
578 case AtomicOrdering::SequentiallyConsistent: return bitc::ORDERING_SEQCST;
580 llvm_unreachable("Invalid ordering");
583 static void writeStringRecord(BitstreamWriter &Stream, unsigned Code,
584 StringRef Str, unsigned AbbrevToUse) {
585 SmallVector<unsigned, 64> Vals;
587 // Code: [strchar x N]
588 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
589 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i]))
591 Vals.push_back(Str[i]);
594 // Emit the finished record.
595 Stream.EmitRecord(Code, Vals, AbbrevToUse);
598 static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
600 case Attribute::Alignment:
601 return bitc::ATTR_KIND_ALIGNMENT;
602 case Attribute::AllocSize:
603 return bitc::ATTR_KIND_ALLOC_SIZE;
604 case Attribute::AlwaysInline:
605 return bitc::ATTR_KIND_ALWAYS_INLINE;
606 case Attribute::ArgMemOnly:
607 return bitc::ATTR_KIND_ARGMEMONLY;
608 case Attribute::Builtin:
609 return bitc::ATTR_KIND_BUILTIN;
610 case Attribute::ByVal:
611 return bitc::ATTR_KIND_BY_VAL;
612 case Attribute::Convergent:
613 return bitc::ATTR_KIND_CONVERGENT;
614 case Attribute::InAlloca:
615 return bitc::ATTR_KIND_IN_ALLOCA;
616 case Attribute::Cold:
617 return bitc::ATTR_KIND_COLD;
618 case Attribute::InaccessibleMemOnly:
619 return bitc::ATTR_KIND_INACCESSIBLEMEM_ONLY;
620 case Attribute::InaccessibleMemOrArgMemOnly:
621 return bitc::ATTR_KIND_INACCESSIBLEMEM_OR_ARGMEMONLY;
622 case Attribute::InlineHint:
623 return bitc::ATTR_KIND_INLINE_HINT;
624 case Attribute::InReg:
625 return bitc::ATTR_KIND_IN_REG;
626 case Attribute::JumpTable:
627 return bitc::ATTR_KIND_JUMP_TABLE;
628 case Attribute::MinSize:
629 return bitc::ATTR_KIND_MIN_SIZE;
630 case Attribute::Naked:
631 return bitc::ATTR_KIND_NAKED;
632 case Attribute::Nest:
633 return bitc::ATTR_KIND_NEST;
634 case Attribute::NoAlias:
635 return bitc::ATTR_KIND_NO_ALIAS;
636 case Attribute::NoBuiltin:
637 return bitc::ATTR_KIND_NO_BUILTIN;
638 case Attribute::NoCapture:
639 return bitc::ATTR_KIND_NO_CAPTURE;
640 case Attribute::NoDuplicate:
641 return bitc::ATTR_KIND_NO_DUPLICATE;
642 case Attribute::NoImplicitFloat:
643 return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT;
644 case Attribute::NoInline:
645 return bitc::ATTR_KIND_NO_INLINE;
646 case Attribute::NoRecurse:
647 return bitc::ATTR_KIND_NO_RECURSE;
648 case Attribute::NonLazyBind:
649 return bitc::ATTR_KIND_NON_LAZY_BIND;
650 case Attribute::NonNull:
651 return bitc::ATTR_KIND_NON_NULL;
652 case Attribute::Dereferenceable:
653 return bitc::ATTR_KIND_DEREFERENCEABLE;
654 case Attribute::DereferenceableOrNull:
655 return bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL;
656 case Attribute::NoRedZone:
657 return bitc::ATTR_KIND_NO_RED_ZONE;
658 case Attribute::NoReturn:
659 return bitc::ATTR_KIND_NO_RETURN;
660 case Attribute::NoCfCheck:
661 return bitc::ATTR_KIND_NOCF_CHECK;
662 case Attribute::NoUnwind:
663 return bitc::ATTR_KIND_NO_UNWIND;
664 case Attribute::OptForFuzzing:
665 return bitc::ATTR_KIND_OPT_FOR_FUZZING;
666 case Attribute::OptimizeForSize:
667 return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE;
668 case Attribute::OptimizeNone:
669 return bitc::ATTR_KIND_OPTIMIZE_NONE;
670 case Attribute::ReadNone:
671 return bitc::ATTR_KIND_READ_NONE;
672 case Attribute::ReadOnly:
673 return bitc::ATTR_KIND_READ_ONLY;
674 case Attribute::Returned:
675 return bitc::ATTR_KIND_RETURNED;
676 case Attribute::ReturnsTwice:
677 return bitc::ATTR_KIND_RETURNS_TWICE;
678 case Attribute::SExt:
679 return bitc::ATTR_KIND_S_EXT;
680 case Attribute::Speculatable:
681 return bitc::ATTR_KIND_SPECULATABLE;
682 case Attribute::StackAlignment:
683 return bitc::ATTR_KIND_STACK_ALIGNMENT;
684 case Attribute::StackProtect:
685 return bitc::ATTR_KIND_STACK_PROTECT;
686 case Attribute::StackProtectReq:
687 return bitc::ATTR_KIND_STACK_PROTECT_REQ;
688 case Attribute::StackProtectStrong:
689 return bitc::ATTR_KIND_STACK_PROTECT_STRONG;
690 case Attribute::SafeStack:
691 return bitc::ATTR_KIND_SAFESTACK;
692 case Attribute::ShadowCallStack:
693 return bitc::ATTR_KIND_SHADOWCALLSTACK;
694 case Attribute::StrictFP:
695 return bitc::ATTR_KIND_STRICT_FP;
696 case Attribute::StructRet:
697 return bitc::ATTR_KIND_STRUCT_RET;
698 case Attribute::SanitizeAddress:
699 return bitc::ATTR_KIND_SANITIZE_ADDRESS;
700 case Attribute::SanitizeHWAddress:
701 return bitc::ATTR_KIND_SANITIZE_HWADDRESS;
702 case Attribute::SanitizeThread:
703 return bitc::ATTR_KIND_SANITIZE_THREAD;
704 case Attribute::SanitizeMemory:
705 return bitc::ATTR_KIND_SANITIZE_MEMORY;
706 case Attribute::SpeculativeLoadHardening:
707 return bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING;
708 case Attribute::SwiftError:
709 return bitc::ATTR_KIND_SWIFT_ERROR;
710 case Attribute::SwiftSelf:
711 return bitc::ATTR_KIND_SWIFT_SELF;
712 case Attribute::UWTable:
713 return bitc::ATTR_KIND_UW_TABLE;
714 case Attribute::WillReturn:
715 return bitc::ATTR_KIND_WILLRETURN;
716 case Attribute::WriteOnly:
717 return bitc::ATTR_KIND_WRITEONLY;
718 case Attribute::ZExt:
719 return bitc::ATTR_KIND_Z_EXT;
720 case Attribute::ImmArg:
721 return bitc::ATTR_KIND_IMMARG;
722 case Attribute::EndAttrKinds:
723 llvm_unreachable("Can not encode end-attribute kinds marker.");
724 case Attribute::None:
725 llvm_unreachable("Can not encode none-attribute.");
728 llvm_unreachable("Trying to encode unknown attribute");
731 void ModuleBitcodeWriter::writeAttributeGroupTable() {
732 const std::vector<ValueEnumerator::IndexAndAttrSet> &AttrGrps =
733 VE.getAttributeGroups();
734 if (AttrGrps.empty()) return;
736 Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
738 SmallVector<uint64_t, 64> Record;
739 for (ValueEnumerator::IndexAndAttrSet Pair : AttrGrps) {
740 unsigned AttrListIndex = Pair.first;
741 AttributeSet AS = Pair.second;
742 Record.push_back(VE.getAttributeGroupID(Pair));
743 Record.push_back(AttrListIndex);
745 for (Attribute Attr : AS) {
746 if (Attr.isEnumAttribute()) {
748 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
749 } else if (Attr.isIntAttribute()) {
751 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
752 Record.push_back(Attr.getValueAsInt());
753 } else if (Attr.isStringAttribute()) {
754 StringRef Kind = Attr.getKindAsString();
755 StringRef Val = Attr.getValueAsString();
757 Record.push_back(Val.empty() ? 3 : 4);
758 Record.append(Kind.begin(), Kind.end());
761 Record.append(Val.begin(), Val.end());
765 assert(Attr.isTypeAttribute());
766 Type *Ty = Attr.getValueAsType();
767 Record.push_back(Ty ? 6 : 5);
768 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
770 Record.push_back(VE.getTypeID(Attr.getValueAsType()));
774 Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
781 void ModuleBitcodeWriter::writeAttributeTable() {
782 const std::vector<AttributeList> &Attrs = VE.getAttributeLists();
783 if (Attrs.empty()) return;
785 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
787 SmallVector<uint64_t, 64> Record;
788 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
789 AttributeList AL = Attrs[i];
790 for (unsigned i = AL.index_begin(), e = AL.index_end(); i != e; ++i) {
791 AttributeSet AS = AL.getAttributes(i);
792 if (AS.hasAttributes())
793 Record.push_back(VE.getAttributeGroupID({i, AS}));
796 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
803 /// WriteTypeTable - Write out the type table for a module.
804 void ModuleBitcodeWriter::writeTypeTable() {
805 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
807 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
808 SmallVector<uint64_t, 64> TypeVals;
810 uint64_t NumBits = VE.computeBitsRequiredForTypeIndicies();
812 // Abbrev for TYPE_CODE_POINTER.
813 auto Abbv = std::make_shared<BitCodeAbbrev>();
814 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
815 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
816 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
817 unsigned PtrAbbrev = Stream.EmitAbbrev(std::move(Abbv));
819 // Abbrev for TYPE_CODE_FUNCTION.
820 Abbv = std::make_shared<BitCodeAbbrev>();
821 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
822 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
823 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
824 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
825 unsigned FunctionAbbrev = Stream.EmitAbbrev(std::move(Abbv));
827 // Abbrev for TYPE_CODE_STRUCT_ANON.
828 Abbv = std::make_shared<BitCodeAbbrev>();
829 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON));
830 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
831 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
832 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
833 unsigned StructAnonAbbrev = Stream.EmitAbbrev(std::move(Abbv));
835 // Abbrev for TYPE_CODE_STRUCT_NAME.
836 Abbv = std::make_shared<BitCodeAbbrev>();
837 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
838 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
839 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
840 unsigned StructNameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
842 // Abbrev for TYPE_CODE_STRUCT_NAMED.
843 Abbv = std::make_shared<BitCodeAbbrev>();
844 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED));
845 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
846 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
847 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
848 unsigned StructNamedAbbrev = Stream.EmitAbbrev(std::move(Abbv));
850 // Abbrev for TYPE_CODE_ARRAY.
851 Abbv = std::make_shared<BitCodeAbbrev>();
852 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
853 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
854 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
855 unsigned ArrayAbbrev = Stream.EmitAbbrev(std::move(Abbv));
857 // Emit an entry count so the reader can reserve space.
858 TypeVals.push_back(TypeList.size());
859 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
862 // Loop over all of the types, emitting each in turn.
863 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
864 Type *T = TypeList[i];
868 switch (T->getTypeID()) {
869 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
870 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break;
871 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
872 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
873 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
874 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
875 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
876 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
877 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
878 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break;
879 case Type::TokenTyID: Code = bitc::TYPE_CODE_TOKEN; break;
880 case Type::IntegerTyID:
882 Code = bitc::TYPE_CODE_INTEGER;
883 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
885 case Type::PointerTyID: {
886 PointerType *PTy = cast<PointerType>(T);
887 // POINTER: [pointee type, address space]
888 Code = bitc::TYPE_CODE_POINTER;
889 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
890 unsigned AddressSpace = PTy->getAddressSpace();
891 TypeVals.push_back(AddressSpace);
892 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
895 case Type::FunctionTyID: {
896 FunctionType *FT = cast<FunctionType>(T);
897 // FUNCTION: [isvararg, retty, paramty x N]
898 Code = bitc::TYPE_CODE_FUNCTION;
899 TypeVals.push_back(FT->isVarArg());
900 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
901 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
902 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
903 AbbrevToUse = FunctionAbbrev;
906 case Type::StructTyID: {
907 StructType *ST = cast<StructType>(T);
908 // STRUCT: [ispacked, eltty x N]
909 TypeVals.push_back(ST->isPacked());
910 // Output all of the element types.
911 for (StructType::element_iterator I = ST->element_begin(),
912 E = ST->element_end(); I != E; ++I)
913 TypeVals.push_back(VE.getTypeID(*I));
915 if (ST->isLiteral()) {
916 Code = bitc::TYPE_CODE_STRUCT_ANON;
917 AbbrevToUse = StructAnonAbbrev;
919 if (ST->isOpaque()) {
920 Code = bitc::TYPE_CODE_OPAQUE;
922 Code = bitc::TYPE_CODE_STRUCT_NAMED;
923 AbbrevToUse = StructNamedAbbrev;
926 // Emit the name if it is present.
927 if (!ST->getName().empty())
928 writeStringRecord(Stream, bitc::TYPE_CODE_STRUCT_NAME, ST->getName(),
933 case Type::ArrayTyID: {
934 ArrayType *AT = cast<ArrayType>(T);
935 // ARRAY: [numelts, eltty]
936 Code = bitc::TYPE_CODE_ARRAY;
937 TypeVals.push_back(AT->getNumElements());
938 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
939 AbbrevToUse = ArrayAbbrev;
942 case Type::VectorTyID: {
943 VectorType *VT = cast<VectorType>(T);
944 // VECTOR [numelts, eltty]
945 Code = bitc::TYPE_CODE_VECTOR;
946 TypeVals.push_back(VT->getNumElements());
947 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
952 // Emit the finished record.
953 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
960 static unsigned getEncodedLinkage(const GlobalValue::LinkageTypes Linkage) {
962 case GlobalValue::ExternalLinkage:
964 case GlobalValue::WeakAnyLinkage:
966 case GlobalValue::AppendingLinkage:
968 case GlobalValue::InternalLinkage:
970 case GlobalValue::LinkOnceAnyLinkage:
972 case GlobalValue::ExternalWeakLinkage:
974 case GlobalValue::CommonLinkage:
976 case GlobalValue::PrivateLinkage:
978 case GlobalValue::WeakODRLinkage:
980 case GlobalValue::LinkOnceODRLinkage:
982 case GlobalValue::AvailableExternallyLinkage:
985 llvm_unreachable("Invalid linkage");
988 static unsigned getEncodedLinkage(const GlobalValue &GV) {
989 return getEncodedLinkage(GV.getLinkage());
992 static uint64_t getEncodedFFlags(FunctionSummary::FFlags Flags) {
993 uint64_t RawFlags = 0;
994 RawFlags |= Flags.ReadNone;
995 RawFlags |= (Flags.ReadOnly << 1);
996 RawFlags |= (Flags.NoRecurse << 2);
997 RawFlags |= (Flags.ReturnDoesNotAlias << 3);
998 RawFlags |= (Flags.NoInline << 4);
1002 // Decode the flags for GlobalValue in the summary
1003 static uint64_t getEncodedGVSummaryFlags(GlobalValueSummary::GVFlags Flags) {
1004 uint64_t RawFlags = 0;
1006 RawFlags |= Flags.NotEligibleToImport; // bool
1007 RawFlags |= (Flags.Live << 1);
1008 RawFlags |= (Flags.DSOLocal << 2);
1009 RawFlags |= (Flags.CanAutoHide << 3);
1011 // Linkage don't need to be remapped at that time for the summary. Any future
1012 // change to the getEncodedLinkage() function will need to be taken into
1013 // account here as well.
1014 RawFlags = (RawFlags << 4) | Flags.Linkage; // 4 bits
1019 static uint64_t getEncodedGVarFlags(GlobalVarSummary::GVarFlags Flags) {
1020 uint64_t RawFlags = Flags.ReadOnly;
1024 static unsigned getEncodedVisibility(const GlobalValue &GV) {
1025 switch (GV.getVisibility()) {
1026 case GlobalValue::DefaultVisibility: return 0;
1027 case GlobalValue::HiddenVisibility: return 1;
1028 case GlobalValue::ProtectedVisibility: return 2;
1030 llvm_unreachable("Invalid visibility");
1033 static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) {
1034 switch (GV.getDLLStorageClass()) {
1035 case GlobalValue::DefaultStorageClass: return 0;
1036 case GlobalValue::DLLImportStorageClass: return 1;
1037 case GlobalValue::DLLExportStorageClass: return 2;
1039 llvm_unreachable("Invalid DLL storage class");
1042 static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) {
1043 switch (GV.getThreadLocalMode()) {
1044 case GlobalVariable::NotThreadLocal: return 0;
1045 case GlobalVariable::GeneralDynamicTLSModel: return 1;
1046 case GlobalVariable::LocalDynamicTLSModel: return 2;
1047 case GlobalVariable::InitialExecTLSModel: return 3;
1048 case GlobalVariable::LocalExecTLSModel: return 4;
1050 llvm_unreachable("Invalid TLS model");
1053 static unsigned getEncodedComdatSelectionKind(const Comdat &C) {
1054 switch (C.getSelectionKind()) {
1056 return bitc::COMDAT_SELECTION_KIND_ANY;
1057 case Comdat::ExactMatch:
1058 return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH;
1059 case Comdat::Largest:
1060 return bitc::COMDAT_SELECTION_KIND_LARGEST;
1061 case Comdat::NoDuplicates:
1062 return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES;
1063 case Comdat::SameSize:
1064 return bitc::COMDAT_SELECTION_KIND_SAME_SIZE;
1066 llvm_unreachable("Invalid selection kind");
1069 static unsigned getEncodedUnnamedAddr(const GlobalValue &GV) {
1070 switch (GV.getUnnamedAddr()) {
1071 case GlobalValue::UnnamedAddr::None: return 0;
1072 case GlobalValue::UnnamedAddr::Local: return 2;
1073 case GlobalValue::UnnamedAddr::Global: return 1;
1075 llvm_unreachable("Invalid unnamed_addr");
1078 size_t ModuleBitcodeWriter::addToStrtab(StringRef Str) {
1081 return StrtabBuilder.add(Str);
1084 void ModuleBitcodeWriter::writeComdats() {
1085 SmallVector<unsigned, 64> Vals;
1086 for (const Comdat *C : VE.getComdats()) {
1087 // COMDAT: [strtab offset, strtab size, selection_kind]
1088 Vals.push_back(addToStrtab(C->getName()));
1089 Vals.push_back(C->getName().size());
1090 Vals.push_back(getEncodedComdatSelectionKind(*C));
1091 Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
1096 /// Write a record that will eventually hold the word offset of the
1097 /// module-level VST. For now the offset is 0, which will be backpatched
1098 /// after the real VST is written. Saves the bit offset to backpatch.
1099 void ModuleBitcodeWriter::writeValueSymbolTableForwardDecl() {
1100 // Write a placeholder value in for the offset of the real VST,
1101 // which is written after the function blocks so that it can include
1102 // the offset of each function. The placeholder offset will be
1103 // updated when the real VST is written.
1104 auto Abbv = std::make_shared<BitCodeAbbrev>();
1105 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_VSTOFFSET));
1106 // Blocks are 32-bit aligned, so we can use a 32-bit word offset to
1107 // hold the real VST offset. Must use fixed instead of VBR as we don't
1108 // know how many VBR chunks to reserve ahead of time.
1109 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1110 unsigned VSTOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1112 // Emit the placeholder
1113 uint64_t Vals[] = {bitc::MODULE_CODE_VSTOFFSET, 0};
1114 Stream.EmitRecordWithAbbrev(VSTOffsetAbbrev, Vals);
1116 // Compute and save the bit offset to the placeholder, which will be
1117 // patched when the real VST is written. We can simply subtract the 32-bit
1118 // fixed size from the current bit number to get the location to backpatch.
1119 VSTOffsetPlaceholder = Stream.GetCurrentBitNo() - 32;
1122 enum StringEncoding { SE_Char6, SE_Fixed7, SE_Fixed8 };
1124 /// Determine the encoding to use for the given string name and length.
1125 static StringEncoding getStringEncoding(StringRef Str) {
1126 bool isChar6 = true;
1127 for (char C : Str) {
1129 isChar6 = BitCodeAbbrevOp::isChar6(C);
1130 if ((unsigned char)C & 128)
1131 // don't bother scanning the rest.
1139 /// Emit top-level description of module, including target triple, inline asm,
1140 /// descriptors for global variables, and function prototype info.
1141 /// Returns the bit offset to backpatch with the location of the real VST.
1142 void ModuleBitcodeWriter::writeModuleInfo() {
1143 // Emit various pieces of data attached to a module.
1144 if (!M.getTargetTriple().empty())
1145 writeStringRecord(Stream, bitc::MODULE_CODE_TRIPLE, M.getTargetTriple(),
1147 const std::string &DL = M.getDataLayoutStr();
1149 writeStringRecord(Stream, bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/);
1150 if (!M.getModuleInlineAsm().empty())
1151 writeStringRecord(Stream, bitc::MODULE_CODE_ASM, M.getModuleInlineAsm(),
1154 // Emit information about sections and GC, computing how many there are. Also
1155 // compute the maximum alignment value.
1156 std::map<std::string, unsigned> SectionMap;
1157 std::map<std::string, unsigned> GCMap;
1158 unsigned MaxAlignment = 0;
1159 unsigned MaxGlobalType = 0;
1160 for (const GlobalValue &GV : M.globals()) {
1161 MaxAlignment = std::max(MaxAlignment, GV.getAlignment());
1162 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getValueType()));
1163 if (GV.hasSection()) {
1164 // Give section names unique ID's.
1165 unsigned &Entry = SectionMap[GV.getSection()];
1167 writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, GV.getSection(),
1169 Entry = SectionMap.size();
1173 for (const Function &F : M) {
1174 MaxAlignment = std::max(MaxAlignment, F.getAlignment());
1175 if (F.hasSection()) {
1176 // Give section names unique ID's.
1177 unsigned &Entry = SectionMap[F.getSection()];
1179 writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, F.getSection(),
1181 Entry = SectionMap.size();
1185 // Same for GC names.
1186 unsigned &Entry = GCMap[F.getGC()];
1188 writeStringRecord(Stream, bitc::MODULE_CODE_GCNAME, F.getGC(),
1190 Entry = GCMap.size();
1195 // Emit abbrev for globals, now that we know # sections and max alignment.
1196 unsigned SimpleGVarAbbrev = 0;
1197 if (!M.global_empty()) {
1198 // Add an abbrev for common globals with no visibility or thread localness.
1199 auto Abbv = std::make_shared<BitCodeAbbrev>();
1200 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
1201 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1202 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1203 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1204 Log2_32_Ceil(MaxGlobalType+1)));
1205 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // AddrSpace << 2
1206 //| explicitType << 1
1208 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
1209 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage.
1210 if (MaxAlignment == 0) // Alignment.
1211 Abbv->Add(BitCodeAbbrevOp(0));
1213 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
1214 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1215 Log2_32_Ceil(MaxEncAlignment+1)));
1217 if (SectionMap.empty()) // Section.
1218 Abbv->Add(BitCodeAbbrevOp(0));
1220 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1221 Log2_32_Ceil(SectionMap.size()+1)));
1222 // Don't bother emitting vis + thread local.
1223 SimpleGVarAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1226 SmallVector<unsigned, 64> Vals;
1227 // Emit the module's source file name.
1229 StringEncoding Bits = getStringEncoding(M.getSourceFileName());
1230 BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8);
1231 if (Bits == SE_Char6)
1232 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6);
1233 else if (Bits == SE_Fixed7)
1234 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7);
1236 // MODULE_CODE_SOURCE_FILENAME: [namechar x N]
1237 auto Abbv = std::make_shared<BitCodeAbbrev>();
1238 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME));
1239 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1240 Abbv->Add(AbbrevOpToUse);
1241 unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1243 for (const auto P : M.getSourceFileName())
1244 Vals.push_back((unsigned char)P);
1246 // Emit the finished record.
1247 Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev);
1251 // Emit the global variable information.
1252 for (const GlobalVariable &GV : M.globals()) {
1253 unsigned AbbrevToUse = 0;
1255 // GLOBALVAR: [strtab offset, strtab size, type, isconst, initid,
1256 // linkage, alignment, section, visibility, threadlocal,
1257 // unnamed_addr, externally_initialized, dllstorageclass,
1258 // comdat, attributes, DSO_Local]
1259 Vals.push_back(addToStrtab(GV.getName()));
1260 Vals.push_back(GV.getName().size());
1261 Vals.push_back(VE.getTypeID(GV.getValueType()));
1262 Vals.push_back(GV.getType()->getAddressSpace() << 2 | 2 | GV.isConstant());
1263 Vals.push_back(GV.isDeclaration() ? 0 :
1264 (VE.getValueID(GV.getInitializer()) + 1));
1265 Vals.push_back(getEncodedLinkage(GV));
1266 Vals.push_back(Log2_32(GV.getAlignment())+1);
1267 Vals.push_back(GV.hasSection() ? SectionMap[GV.getSection()] : 0);
1268 if (GV.isThreadLocal() ||
1269 GV.getVisibility() != GlobalValue::DefaultVisibility ||
1270 GV.getUnnamedAddr() != GlobalValue::UnnamedAddr::None ||
1271 GV.isExternallyInitialized() ||
1272 GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass ||
1274 GV.hasAttributes() ||
1276 GV.hasPartition()) {
1277 Vals.push_back(getEncodedVisibility(GV));
1278 Vals.push_back(getEncodedThreadLocalMode(GV));
1279 Vals.push_back(getEncodedUnnamedAddr(GV));
1280 Vals.push_back(GV.isExternallyInitialized());
1281 Vals.push_back(getEncodedDLLStorageClass(GV));
1282 Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0);
1284 auto AL = GV.getAttributesAsList(AttributeList::FunctionIndex);
1285 Vals.push_back(VE.getAttributeListID(AL));
1287 Vals.push_back(GV.isDSOLocal());
1288 Vals.push_back(addToStrtab(GV.getPartition()));
1289 Vals.push_back(GV.getPartition().size());
1291 AbbrevToUse = SimpleGVarAbbrev;
1294 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
1298 // Emit the function proto information.
1299 for (const Function &F : M) {
1300 // FUNCTION: [strtab offset, strtab size, type, callingconv, isproto,
1301 // linkage, paramattrs, alignment, section, visibility, gc,
1302 // unnamed_addr, prologuedata, dllstorageclass, comdat,
1303 // prefixdata, personalityfn, DSO_Local, addrspace]
1304 Vals.push_back(addToStrtab(F.getName()));
1305 Vals.push_back(F.getName().size());
1306 Vals.push_back(VE.getTypeID(F.getFunctionType()));
1307 Vals.push_back(F.getCallingConv());
1308 Vals.push_back(F.isDeclaration());
1309 Vals.push_back(getEncodedLinkage(F));
1310 Vals.push_back(VE.getAttributeListID(F.getAttributes()));
1311 Vals.push_back(Log2_32(F.getAlignment())+1);
1312 Vals.push_back(F.hasSection() ? SectionMap[F.getSection()] : 0);
1313 Vals.push_back(getEncodedVisibility(F));
1314 Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0);
1315 Vals.push_back(getEncodedUnnamedAddr(F));
1316 Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1)
1318 Vals.push_back(getEncodedDLLStorageClass(F));
1319 Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0);
1320 Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1)
1323 F.hasPersonalityFn() ? (VE.getValueID(F.getPersonalityFn()) + 1) : 0);
1325 Vals.push_back(F.isDSOLocal());
1326 Vals.push_back(F.getAddressSpace());
1327 Vals.push_back(addToStrtab(F.getPartition()));
1328 Vals.push_back(F.getPartition().size());
1330 unsigned AbbrevToUse = 0;
1331 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
1335 // Emit the alias information.
1336 for (const GlobalAlias &A : M.aliases()) {
1337 // ALIAS: [strtab offset, strtab size, alias type, aliasee val#, linkage,
1338 // visibility, dllstorageclass, threadlocal, unnamed_addr,
1340 Vals.push_back(addToStrtab(A.getName()));
1341 Vals.push_back(A.getName().size());
1342 Vals.push_back(VE.getTypeID(A.getValueType()));
1343 Vals.push_back(A.getType()->getAddressSpace());
1344 Vals.push_back(VE.getValueID(A.getAliasee()));
1345 Vals.push_back(getEncodedLinkage(A));
1346 Vals.push_back(getEncodedVisibility(A));
1347 Vals.push_back(getEncodedDLLStorageClass(A));
1348 Vals.push_back(getEncodedThreadLocalMode(A));
1349 Vals.push_back(getEncodedUnnamedAddr(A));
1350 Vals.push_back(A.isDSOLocal());
1351 Vals.push_back(addToStrtab(A.getPartition()));
1352 Vals.push_back(A.getPartition().size());
1354 unsigned AbbrevToUse = 0;
1355 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
1359 // Emit the ifunc information.
1360 for (const GlobalIFunc &I : M.ifuncs()) {
1361 // IFUNC: [strtab offset, strtab size, ifunc type, address space, resolver
1362 // val#, linkage, visibility, DSO_Local]
1363 Vals.push_back(addToStrtab(I.getName()));
1364 Vals.push_back(I.getName().size());
1365 Vals.push_back(VE.getTypeID(I.getValueType()));
1366 Vals.push_back(I.getType()->getAddressSpace());
1367 Vals.push_back(VE.getValueID(I.getResolver()));
1368 Vals.push_back(getEncodedLinkage(I));
1369 Vals.push_back(getEncodedVisibility(I));
1370 Vals.push_back(I.isDSOLocal());
1371 Vals.push_back(addToStrtab(I.getPartition()));
1372 Vals.push_back(I.getPartition().size());
1373 Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
1377 writeValueSymbolTableForwardDecl();
1380 static uint64_t getOptimizationFlags(const Value *V) {
1383 if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) {
1384 if (OBO->hasNoSignedWrap())
1385 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
1386 if (OBO->hasNoUnsignedWrap())
1387 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
1388 } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) {
1390 Flags |= 1 << bitc::PEO_EXACT;
1391 } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) {
1392 if (FPMO->hasAllowReassoc())
1393 Flags |= bitc::AllowReassoc;
1394 if (FPMO->hasNoNaNs())
1395 Flags |= bitc::NoNaNs;
1396 if (FPMO->hasNoInfs())
1397 Flags |= bitc::NoInfs;
1398 if (FPMO->hasNoSignedZeros())
1399 Flags |= bitc::NoSignedZeros;
1400 if (FPMO->hasAllowReciprocal())
1401 Flags |= bitc::AllowReciprocal;
1402 if (FPMO->hasAllowContract())
1403 Flags |= bitc::AllowContract;
1404 if (FPMO->hasApproxFunc())
1405 Flags |= bitc::ApproxFunc;
1411 void ModuleBitcodeWriter::writeValueAsMetadata(
1412 const ValueAsMetadata *MD, SmallVectorImpl<uint64_t> &Record) {
1413 // Mimic an MDNode with a value as one operand.
1414 Value *V = MD->getValue();
1415 Record.push_back(VE.getTypeID(V->getType()));
1416 Record.push_back(VE.getValueID(V));
1417 Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0);
1421 void ModuleBitcodeWriter::writeMDTuple(const MDTuple *N,
1422 SmallVectorImpl<uint64_t> &Record,
1424 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
1425 Metadata *MD = N->getOperand(i);
1426 assert(!(MD && isa<LocalAsMetadata>(MD)) &&
1427 "Unexpected function-local metadata");
1428 Record.push_back(VE.getMetadataOrNullID(MD));
1430 Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
1431 : bitc::METADATA_NODE,
1436 unsigned ModuleBitcodeWriter::createDILocationAbbrev() {
1437 // Assume the column is usually under 128, and always output the inlined-at
1438 // location (it's never more expensive than building an array size 1).
1439 auto Abbv = std::make_shared<BitCodeAbbrev>();
1440 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION));
1441 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1442 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1443 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1444 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1445 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1446 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1447 return Stream.EmitAbbrev(std::move(Abbv));
1450 void ModuleBitcodeWriter::writeDILocation(const DILocation *N,
1451 SmallVectorImpl<uint64_t> &Record,
1454 Abbrev = createDILocationAbbrev();
1456 Record.push_back(N->isDistinct());
1457 Record.push_back(N->getLine());
1458 Record.push_back(N->getColumn());
1459 Record.push_back(VE.getMetadataID(N->getScope()));
1460 Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt()));
1461 Record.push_back(N->isImplicitCode());
1463 Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
1467 unsigned ModuleBitcodeWriter::createGenericDINodeAbbrev() {
1468 // Assume the column is usually under 128, and always output the inlined-at
1469 // location (it's never more expensive than building an array size 1).
1470 auto Abbv = std::make_shared<BitCodeAbbrev>();
1471 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG));
1472 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1473 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1474 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1475 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1476 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1477 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1478 return Stream.EmitAbbrev(std::move(Abbv));
1481 void ModuleBitcodeWriter::writeGenericDINode(const GenericDINode *N,
1482 SmallVectorImpl<uint64_t> &Record,
1485 Abbrev = createGenericDINodeAbbrev();
1487 Record.push_back(N->isDistinct());
1488 Record.push_back(N->getTag());
1489 Record.push_back(0); // Per-tag version field; unused for now.
1491 for (auto &I : N->operands())
1492 Record.push_back(VE.getMetadataOrNullID(I));
1494 Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev);
1498 static uint64_t rotateSign(int64_t I) {
1500 return I < 0 ? ~(U << 1) : U << 1;
1503 void ModuleBitcodeWriter::writeDISubrange(const DISubrange *N,
1504 SmallVectorImpl<uint64_t> &Record,
1506 const uint64_t Version = 1 << 1;
1507 Record.push_back((uint64_t)N->isDistinct() | Version);
1508 Record.push_back(VE.getMetadataOrNullID(N->getRawCountNode()));
1509 Record.push_back(rotateSign(N->getLowerBound()));
1511 Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
1515 void ModuleBitcodeWriter::writeDIEnumerator(const DIEnumerator *N,
1516 SmallVectorImpl<uint64_t> &Record,
1518 Record.push_back((N->isUnsigned() << 1) | N->isDistinct());
1519 Record.push_back(rotateSign(N->getValue()));
1520 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1522 Stream.EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev);
1526 void ModuleBitcodeWriter::writeDIBasicType(const DIBasicType *N,
1527 SmallVectorImpl<uint64_t> &Record,
1529 Record.push_back(N->isDistinct());
1530 Record.push_back(N->getTag());
1531 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1532 Record.push_back(N->getSizeInBits());
1533 Record.push_back(N->getAlignInBits());
1534 Record.push_back(N->getEncoding());
1535 Record.push_back(N->getFlags());
1537 Stream.EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev);
1541 void ModuleBitcodeWriter::writeDIDerivedType(const DIDerivedType *N,
1542 SmallVectorImpl<uint64_t> &Record,
1544 Record.push_back(N->isDistinct());
1545 Record.push_back(N->getTag());
1546 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1547 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1548 Record.push_back(N->getLine());
1549 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1550 Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
1551 Record.push_back(N->getSizeInBits());
1552 Record.push_back(N->getAlignInBits());
1553 Record.push_back(N->getOffsetInBits());
1554 Record.push_back(N->getFlags());
1555 Record.push_back(VE.getMetadataOrNullID(N->getExtraData()));
1557 // DWARF address space is encoded as N->getDWARFAddressSpace() + 1. 0 means
1558 // that there is no DWARF address space associated with DIDerivedType.
1559 if (const auto &DWARFAddressSpace = N->getDWARFAddressSpace())
1560 Record.push_back(*DWARFAddressSpace + 1);
1562 Record.push_back(0);
1564 Stream.EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev);
1568 void ModuleBitcodeWriter::writeDICompositeType(
1569 const DICompositeType *N, SmallVectorImpl<uint64_t> &Record,
1571 const unsigned IsNotUsedInOldTypeRef = 0x2;
1572 Record.push_back(IsNotUsedInOldTypeRef | (unsigned)N->isDistinct());
1573 Record.push_back(N->getTag());
1574 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1575 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1576 Record.push_back(N->getLine());
1577 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1578 Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
1579 Record.push_back(N->getSizeInBits());
1580 Record.push_back(N->getAlignInBits());
1581 Record.push_back(N->getOffsetInBits());
1582 Record.push_back(N->getFlags());
1583 Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
1584 Record.push_back(N->getRuntimeLang());
1585 Record.push_back(VE.getMetadataOrNullID(N->getVTableHolder()));
1586 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
1587 Record.push_back(VE.getMetadataOrNullID(N->getRawIdentifier()));
1588 Record.push_back(VE.getMetadataOrNullID(N->getDiscriminator()));
1590 Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev);
1594 void ModuleBitcodeWriter::writeDISubroutineType(
1595 const DISubroutineType *N, SmallVectorImpl<uint64_t> &Record,
1597 const unsigned HasNoOldTypeRefs = 0x2;
1598 Record.push_back(HasNoOldTypeRefs | (unsigned)N->isDistinct());
1599 Record.push_back(N->getFlags());
1600 Record.push_back(VE.getMetadataOrNullID(N->getTypeArray().get()));
1601 Record.push_back(N->getCC());
1603 Stream.EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev);
1607 void ModuleBitcodeWriter::writeDIFile(const DIFile *N,
1608 SmallVectorImpl<uint64_t> &Record,
1610 Record.push_back(N->isDistinct());
1611 Record.push_back(VE.getMetadataOrNullID(N->getRawFilename()));
1612 Record.push_back(VE.getMetadataOrNullID(N->getRawDirectory()));
1613 if (N->getRawChecksum()) {
1614 Record.push_back(N->getRawChecksum()->Kind);
1615 Record.push_back(VE.getMetadataOrNullID(N->getRawChecksum()->Value));
1617 // Maintain backwards compatibility with the old internal representation of
1618 // CSK_None in ChecksumKind by writing nulls here when Checksum is None.
1619 Record.push_back(0);
1620 Record.push_back(VE.getMetadataOrNullID(nullptr));
1622 auto Source = N->getRawSource();
1624 Record.push_back(VE.getMetadataOrNullID(*Source));
1626 Stream.EmitRecord(bitc::METADATA_FILE, Record, Abbrev);
1630 void ModuleBitcodeWriter::writeDICompileUnit(const DICompileUnit *N,
1631 SmallVectorImpl<uint64_t> &Record,
1633 assert(N->isDistinct() && "Expected distinct compile units");
1634 Record.push_back(/* IsDistinct */ true);
1635 Record.push_back(N->getSourceLanguage());
1636 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1637 Record.push_back(VE.getMetadataOrNullID(N->getRawProducer()));
1638 Record.push_back(N->isOptimized());
1639 Record.push_back(VE.getMetadataOrNullID(N->getRawFlags()));
1640 Record.push_back(N->getRuntimeVersion());
1641 Record.push_back(VE.getMetadataOrNullID(N->getRawSplitDebugFilename()));
1642 Record.push_back(N->getEmissionKind());
1643 Record.push_back(VE.getMetadataOrNullID(N->getEnumTypes().get()));
1644 Record.push_back(VE.getMetadataOrNullID(N->getRetainedTypes().get()));
1645 Record.push_back(/* subprograms */ 0);
1646 Record.push_back(VE.getMetadataOrNullID(N->getGlobalVariables().get()));
1647 Record.push_back(VE.getMetadataOrNullID(N->getImportedEntities().get()));
1648 Record.push_back(N->getDWOId());
1649 Record.push_back(VE.getMetadataOrNullID(N->getMacros().get()));
1650 Record.push_back(N->getSplitDebugInlining());
1651 Record.push_back(N->getDebugInfoForProfiling());
1652 Record.push_back((unsigned)N->getNameTableKind());
1654 Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev);
1658 void ModuleBitcodeWriter::writeDISubprogram(const DISubprogram *N,
1659 SmallVectorImpl<uint64_t> &Record,
1661 const uint64_t HasUnitFlag = 1 << 1;
1662 const uint64_t HasSPFlagsFlag = 1 << 2;
1663 Record.push_back(uint64_t(N->isDistinct()) | HasUnitFlag | HasSPFlagsFlag);
1664 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1665 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1666 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
1667 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1668 Record.push_back(N->getLine());
1669 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1670 Record.push_back(N->getScopeLine());
1671 Record.push_back(VE.getMetadataOrNullID(N->getContainingType()));
1672 Record.push_back(N->getSPFlags());
1673 Record.push_back(N->getVirtualIndex());
1674 Record.push_back(N->getFlags());
1675 Record.push_back(VE.getMetadataOrNullID(N->getRawUnit()));
1676 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
1677 Record.push_back(VE.getMetadataOrNullID(N->getDeclaration()));
1678 Record.push_back(VE.getMetadataOrNullID(N->getRetainedNodes().get()));
1679 Record.push_back(N->getThisAdjustment());
1680 Record.push_back(VE.getMetadataOrNullID(N->getThrownTypes().get()));
1682 Stream.EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev);
1686 void ModuleBitcodeWriter::writeDILexicalBlock(const DILexicalBlock *N,
1687 SmallVectorImpl<uint64_t> &Record,
1689 Record.push_back(N->isDistinct());
1690 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1691 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1692 Record.push_back(N->getLine());
1693 Record.push_back(N->getColumn());
1695 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev);
1699 void ModuleBitcodeWriter::writeDILexicalBlockFile(
1700 const DILexicalBlockFile *N, SmallVectorImpl<uint64_t> &Record,
1702 Record.push_back(N->isDistinct());
1703 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1704 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1705 Record.push_back(N->getDiscriminator());
1707 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev);
1711 void ModuleBitcodeWriter::writeDICommonBlock(const DICommonBlock *N,
1712 SmallVectorImpl<uint64_t> &Record,
1714 Record.push_back(N->isDistinct());
1715 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1716 Record.push_back(VE.getMetadataOrNullID(N->getDecl()));
1717 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1718 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1719 Record.push_back(N->getLineNo());
1721 Stream.EmitRecord(bitc::METADATA_COMMON_BLOCK, Record, Abbrev);
1725 void ModuleBitcodeWriter::writeDINamespace(const DINamespace *N,
1726 SmallVectorImpl<uint64_t> &Record,
1728 Record.push_back(N->isDistinct() | N->getExportSymbols() << 1);
1729 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1730 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1732 Stream.EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev);
1736 void ModuleBitcodeWriter::writeDIMacro(const DIMacro *N,
1737 SmallVectorImpl<uint64_t> &Record,
1739 Record.push_back(N->isDistinct());
1740 Record.push_back(N->getMacinfoType());
1741 Record.push_back(N->getLine());
1742 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1743 Record.push_back(VE.getMetadataOrNullID(N->getRawValue()));
1745 Stream.EmitRecord(bitc::METADATA_MACRO, Record, Abbrev);
1749 void ModuleBitcodeWriter::writeDIMacroFile(const DIMacroFile *N,
1750 SmallVectorImpl<uint64_t> &Record,
1752 Record.push_back(N->isDistinct());
1753 Record.push_back(N->getMacinfoType());
1754 Record.push_back(N->getLine());
1755 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1756 Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
1758 Stream.EmitRecord(bitc::METADATA_MACRO_FILE, Record, Abbrev);
1762 void ModuleBitcodeWriter::writeDIModule(const DIModule *N,
1763 SmallVectorImpl<uint64_t> &Record,
1765 Record.push_back(N->isDistinct());
1766 for (auto &I : N->operands())
1767 Record.push_back(VE.getMetadataOrNullID(I));
1769 Stream.EmitRecord(bitc::METADATA_MODULE, Record, Abbrev);
1773 void ModuleBitcodeWriter::writeDITemplateTypeParameter(
1774 const DITemplateTypeParameter *N, SmallVectorImpl<uint64_t> &Record,
1776 Record.push_back(N->isDistinct());
1777 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1778 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1780 Stream.EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev);
1784 void ModuleBitcodeWriter::writeDITemplateValueParameter(
1785 const DITemplateValueParameter *N, SmallVectorImpl<uint64_t> &Record,
1787 Record.push_back(N->isDistinct());
1788 Record.push_back(N->getTag());
1789 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1790 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1791 Record.push_back(VE.getMetadataOrNullID(N->getValue()));
1793 Stream.EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev);
1797 void ModuleBitcodeWriter::writeDIGlobalVariable(
1798 const DIGlobalVariable *N, SmallVectorImpl<uint64_t> &Record,
1800 const uint64_t Version = 2 << 1;
1801 Record.push_back((uint64_t)N->isDistinct() | Version);
1802 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1803 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1804 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
1805 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1806 Record.push_back(N->getLine());
1807 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1808 Record.push_back(N->isLocalToUnit());
1809 Record.push_back(N->isDefinition());
1810 Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration()));
1811 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams()));
1812 Record.push_back(N->getAlignInBits());
1814 Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev);
1818 void ModuleBitcodeWriter::writeDILocalVariable(
1819 const DILocalVariable *N, SmallVectorImpl<uint64_t> &Record,
1821 // In order to support all possible bitcode formats in BitcodeReader we need
1822 // to distinguish the following cases:
1823 // 1) Record has no artificial tag (Record[1]),
1824 // has no obsolete inlinedAt field (Record[9]).
1825 // In this case Record size will be 8, HasAlignment flag is false.
1826 // 2) Record has artificial tag (Record[1]),
1827 // has no obsolete inlignedAt field (Record[9]).
1828 // In this case Record size will be 9, HasAlignment flag is false.
1829 // 3) Record has both artificial tag (Record[1]) and
1830 // obsolete inlignedAt field (Record[9]).
1831 // In this case Record size will be 10, HasAlignment flag is false.
1832 // 4) Record has neither artificial tag, nor inlignedAt field, but
1833 // HasAlignment flag is true and Record[8] contains alignment value.
1834 const uint64_t HasAlignmentFlag = 1 << 1;
1835 Record.push_back((uint64_t)N->isDistinct() | HasAlignmentFlag);
1836 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1837 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1838 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1839 Record.push_back(N->getLine());
1840 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1841 Record.push_back(N->getArg());
1842 Record.push_back(N->getFlags());
1843 Record.push_back(N->getAlignInBits());
1845 Stream.EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev);
1849 void ModuleBitcodeWriter::writeDILabel(
1850 const DILabel *N, SmallVectorImpl<uint64_t> &Record,
1852 Record.push_back((uint64_t)N->isDistinct());
1853 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1854 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1855 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1856 Record.push_back(N->getLine());
1858 Stream.EmitRecord(bitc::METADATA_LABEL, Record, Abbrev);
1862 void ModuleBitcodeWriter::writeDIExpression(const DIExpression *N,
1863 SmallVectorImpl<uint64_t> &Record,
1865 Record.reserve(N->getElements().size() + 1);
1866 const uint64_t Version = 3 << 1;
1867 Record.push_back((uint64_t)N->isDistinct() | Version);
1868 Record.append(N->elements_begin(), N->elements_end());
1870 Stream.EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev);
1874 void ModuleBitcodeWriter::writeDIGlobalVariableExpression(
1875 const DIGlobalVariableExpression *N, SmallVectorImpl<uint64_t> &Record,
1877 Record.push_back(N->isDistinct());
1878 Record.push_back(VE.getMetadataOrNullID(N->getVariable()));
1879 Record.push_back(VE.getMetadataOrNullID(N->getExpression()));
1881 Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR_EXPR, Record, Abbrev);
1885 void ModuleBitcodeWriter::writeDIObjCProperty(const DIObjCProperty *N,
1886 SmallVectorImpl<uint64_t> &Record,
1888 Record.push_back(N->isDistinct());
1889 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1890 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1891 Record.push_back(N->getLine());
1892 Record.push_back(VE.getMetadataOrNullID(N->getRawSetterName()));
1893 Record.push_back(VE.getMetadataOrNullID(N->getRawGetterName()));
1894 Record.push_back(N->getAttributes());
1895 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1897 Stream.EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev);
1901 void ModuleBitcodeWriter::writeDIImportedEntity(
1902 const DIImportedEntity *N, SmallVectorImpl<uint64_t> &Record,
1904 Record.push_back(N->isDistinct());
1905 Record.push_back(N->getTag());
1906 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1907 Record.push_back(VE.getMetadataOrNullID(N->getEntity()));
1908 Record.push_back(N->getLine());
1909 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1910 Record.push_back(VE.getMetadataOrNullID(N->getRawFile()));
1912 Stream.EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev);
1916 unsigned ModuleBitcodeWriter::createNamedMetadataAbbrev() {
1917 auto Abbv = std::make_shared<BitCodeAbbrev>();
1918 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME));
1919 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1920 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1921 return Stream.EmitAbbrev(std::move(Abbv));
1924 void ModuleBitcodeWriter::writeNamedMetadata(
1925 SmallVectorImpl<uint64_t> &Record) {
1926 if (M.named_metadata_empty())
1929 unsigned Abbrev = createNamedMetadataAbbrev();
1930 for (const NamedMDNode &NMD : M.named_metadata()) {
1932 StringRef Str = NMD.getName();
1933 Record.append(Str.bytes_begin(), Str.bytes_end());
1934 Stream.EmitRecord(bitc::METADATA_NAME, Record, Abbrev);
1937 // Write named metadata operands.
1938 for (const MDNode *N : NMD.operands())
1939 Record.push_back(VE.getMetadataID(N));
1940 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
1945 unsigned ModuleBitcodeWriter::createMetadataStringsAbbrev() {
1946 auto Abbv = std::make_shared<BitCodeAbbrev>();
1947 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRINGS));
1948 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of strings
1949 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // offset to chars
1950 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1951 return Stream.EmitAbbrev(std::move(Abbv));
1954 /// Write out a record for MDString.
1956 /// All the metadata strings in a metadata block are emitted in a single
1957 /// record. The sizes and strings themselves are shoved into a blob.
1958 void ModuleBitcodeWriter::writeMetadataStrings(
1959 ArrayRef<const Metadata *> Strings, SmallVectorImpl<uint64_t> &Record) {
1960 if (Strings.empty())
1963 // Start the record with the number of strings.
1964 Record.push_back(bitc::METADATA_STRINGS);
1965 Record.push_back(Strings.size());
1967 // Emit the sizes of the strings in the blob.
1968 SmallString<256> Blob;
1970 BitstreamWriter W(Blob);
1971 for (const Metadata *MD : Strings)
1972 W.EmitVBR(cast<MDString>(MD)->getLength(), 6);
1976 // Add the offset to the strings to the record.
1977 Record.push_back(Blob.size());
1979 // Add the strings to the blob.
1980 for (const Metadata *MD : Strings)
1981 Blob.append(cast<MDString>(MD)->getString());
1983 // Emit the final record.
1984 Stream.EmitRecordWithBlob(createMetadataStringsAbbrev(), Record, Blob);
1988 // Generates an enum to use as an index in the Abbrev array of Metadata record.
1989 enum MetadataAbbrev : unsigned {
1990 #define HANDLE_MDNODE_LEAF(CLASS) CLASS##AbbrevID,
1991 #include "llvm/IR/Metadata.def"
1995 void ModuleBitcodeWriter::writeMetadataRecords(
1996 ArrayRef<const Metadata *> MDs, SmallVectorImpl<uint64_t> &Record,
1997 std::vector<unsigned> *MDAbbrevs, std::vector<uint64_t> *IndexPos) {
2001 // Initialize MDNode abbreviations.
2002 #define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0;
2003 #include "llvm/IR/Metadata.def"
2005 for (const Metadata *MD : MDs) {
2007 IndexPos->push_back(Stream.GetCurrentBitNo());
2008 if (const MDNode *N = dyn_cast<MDNode>(MD)) {
2009 assert(N->isResolved() && "Expected forward references to be resolved");
2011 switch (N->getMetadataID()) {
2013 llvm_unreachable("Invalid MDNode subclass");
2014 #define HANDLE_MDNODE_LEAF(CLASS) \
2015 case Metadata::CLASS##Kind: \
2017 write##CLASS(cast<CLASS>(N), Record, \
2018 (*MDAbbrevs)[MetadataAbbrev::CLASS##AbbrevID]); \
2020 write##CLASS(cast<CLASS>(N), Record, CLASS##Abbrev); \
2022 #include "llvm/IR/Metadata.def"
2025 writeValueAsMetadata(cast<ValueAsMetadata>(MD), Record);
2029 void ModuleBitcodeWriter::writeModuleMetadata() {
2030 if (!VE.hasMDs() && M.named_metadata_empty())
2033 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 4);
2034 SmallVector<uint64_t, 64> Record;
2036 // Emit all abbrevs upfront, so that the reader can jump in the middle of the
2037 // block and load any metadata.
2038 std::vector<unsigned> MDAbbrevs;
2040 MDAbbrevs.resize(MetadataAbbrev::LastPlusOne);
2041 MDAbbrevs[MetadataAbbrev::DILocationAbbrevID] = createDILocationAbbrev();
2042 MDAbbrevs[MetadataAbbrev::GenericDINodeAbbrevID] =
2043 createGenericDINodeAbbrev();
2045 auto Abbv = std::make_shared<BitCodeAbbrev>();
2046 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX_OFFSET));
2047 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2048 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2049 unsigned OffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
2051 Abbv = std::make_shared<BitCodeAbbrev>();
2052 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX));
2053 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2054 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
2055 unsigned IndexAbbrev = Stream.EmitAbbrev(std::move(Abbv));
2057 // Emit MDStrings together upfront.
2058 writeMetadataStrings(VE.getMDStrings(), Record);
2060 // We only emit an index for the metadata record if we have more than a given
2061 // (naive) threshold of metadatas, otherwise it is not worth it.
2062 if (VE.getNonMDStrings().size() > IndexThreshold) {
2063 // Write a placeholder value in for the offset of the metadata index,
2064 // which is written after the records, so that it can include
2065 // the offset of each entry. The placeholder offset will be
2066 // updated after all records are emitted.
2067 uint64_t Vals[] = {0, 0};
2068 Stream.EmitRecord(bitc::METADATA_INDEX_OFFSET, Vals, OffsetAbbrev);
2071 // Compute and save the bit offset to the current position, which will be
2072 // patched when we emit the index later. We can simply subtract the 64-bit
2073 // fixed size from the current bit number to get the location to backpatch.
2074 uint64_t IndexOffsetRecordBitPos = Stream.GetCurrentBitNo();
2076 // This index will contain the bitpos for each individual record.
2077 std::vector<uint64_t> IndexPos;
2078 IndexPos.reserve(VE.getNonMDStrings().size());
2080 // Write all the records
2081 writeMetadataRecords(VE.getNonMDStrings(), Record, &MDAbbrevs, &IndexPos);
2083 if (VE.getNonMDStrings().size() > IndexThreshold) {
2084 // Now that we have emitted all the records we will emit the index. But
2086 // backpatch the forward reference so that the reader can skip the records
2088 Stream.BackpatchWord64(IndexOffsetRecordBitPos - 64,
2089 Stream.GetCurrentBitNo() - IndexOffsetRecordBitPos);
2091 // Delta encode the index.
2092 uint64_t PreviousValue = IndexOffsetRecordBitPos;
2093 for (auto &Elt : IndexPos) {
2094 auto EltDelta = Elt - PreviousValue;
2095 PreviousValue = Elt;
2098 // Emit the index record.
2099 Stream.EmitRecord(bitc::METADATA_INDEX, IndexPos, IndexAbbrev);
2103 // Write the named metadata now.
2104 writeNamedMetadata(Record);
2106 auto AddDeclAttachedMetadata = [&](const GlobalObject &GO) {
2107 SmallVector<uint64_t, 4> Record;
2108 Record.push_back(VE.getValueID(&GO));
2109 pushGlobalMetadataAttachment(Record, GO);
2110 Stream.EmitRecord(bitc::METADATA_GLOBAL_DECL_ATTACHMENT, Record);
2112 for (const Function &F : M)
2113 if (F.isDeclaration() && F.hasMetadata())
2114 AddDeclAttachedMetadata(F);
2115 // FIXME: Only store metadata for declarations here, and move data for global
2116 // variable definitions to a separate block (PR28134).
2117 for (const GlobalVariable &GV : M.globals())
2118 if (GV.hasMetadata())
2119 AddDeclAttachedMetadata(GV);
2124 void ModuleBitcodeWriter::writeFunctionMetadata(const Function &F) {
2128 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
2129 SmallVector<uint64_t, 64> Record;
2130 writeMetadataStrings(VE.getMDStrings(), Record);
2131 writeMetadataRecords(VE.getNonMDStrings(), Record);
2135 void ModuleBitcodeWriter::pushGlobalMetadataAttachment(
2136 SmallVectorImpl<uint64_t> &Record, const GlobalObject &GO) {
2137 // [n x [id, mdnode]]
2138 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
2139 GO.getAllMetadata(MDs);
2140 for (const auto &I : MDs) {
2141 Record.push_back(I.first);
2142 Record.push_back(VE.getMetadataID(I.second));
2146 void ModuleBitcodeWriter::writeFunctionMetadataAttachment(const Function &F) {
2147 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
2149 SmallVector<uint64_t, 64> Record;
2151 if (F.hasMetadata()) {
2152 pushGlobalMetadataAttachment(Record, F);
2153 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
2157 // Write metadata attachments
2158 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
2159 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
2160 for (const BasicBlock &BB : F)
2161 for (const Instruction &I : BB) {
2163 I.getAllMetadataOtherThanDebugLoc(MDs);
2165 // If no metadata, ignore instruction.
2166 if (MDs.empty()) continue;
2168 Record.push_back(VE.getInstructionID(&I));
2170 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
2171 Record.push_back(MDs[i].first);
2172 Record.push_back(VE.getMetadataID(MDs[i].second));
2174 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
2181 void ModuleBitcodeWriter::writeModuleMetadataKinds() {
2182 SmallVector<uint64_t, 64> Record;
2184 // Write metadata kinds
2185 // METADATA_KIND - [n x [id, name]]
2186 SmallVector<StringRef, 8> Names;
2187 M.getMDKindNames(Names);
2189 if (Names.empty()) return;
2191 Stream.EnterSubblock(bitc::METADATA_KIND_BLOCK_ID, 3);
2193 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
2194 Record.push_back(MDKindID);
2195 StringRef KName = Names[MDKindID];
2196 Record.append(KName.begin(), KName.end());
2198 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
2205 void ModuleBitcodeWriter::writeOperandBundleTags() {
2206 // Write metadata kinds
2208 // OPERAND_BUNDLE_TAGS_BLOCK_ID : N x OPERAND_BUNDLE_TAG
2210 // OPERAND_BUNDLE_TAG - [strchr x N]
2212 SmallVector<StringRef, 8> Tags;
2213 M.getOperandBundleTags(Tags);
2218 Stream.EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3);
2220 SmallVector<uint64_t, 64> Record;
2222 for (auto Tag : Tags) {
2223 Record.append(Tag.begin(), Tag.end());
2225 Stream.EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0);
2232 void ModuleBitcodeWriter::writeSyncScopeNames() {
2233 SmallVector<StringRef, 8> SSNs;
2234 M.getContext().getSyncScopeNames(SSNs);
2238 Stream.EnterSubblock(bitc::SYNC_SCOPE_NAMES_BLOCK_ID, 2);
2240 SmallVector<uint64_t, 64> Record;
2241 for (auto SSN : SSNs) {
2242 Record.append(SSN.begin(), SSN.end());
2243 Stream.EmitRecord(bitc::SYNC_SCOPE_NAME, Record, 0);
2250 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
2251 if ((int64_t)V >= 0)
2252 Vals.push_back(V << 1);
2254 Vals.push_back((-V << 1) | 1);
2257 void ModuleBitcodeWriter::writeConstants(unsigned FirstVal, unsigned LastVal,
2259 if (FirstVal == LastVal) return;
2261 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
2263 unsigned AggregateAbbrev = 0;
2264 unsigned String8Abbrev = 0;
2265 unsigned CString7Abbrev = 0;
2266 unsigned CString6Abbrev = 0;
2267 // If this is a constant pool for the module, emit module-specific abbrevs.
2269 // Abbrev for CST_CODE_AGGREGATE.
2270 auto Abbv = std::make_shared<BitCodeAbbrev>();
2271 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
2272 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2273 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
2274 AggregateAbbrev = Stream.EmitAbbrev(std::move(Abbv));
2276 // Abbrev for CST_CODE_STRING.
2277 Abbv = std::make_shared<BitCodeAbbrev>();
2278 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
2279 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2280 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
2281 String8Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2282 // Abbrev for CST_CODE_CSTRING.
2283 Abbv = std::make_shared<BitCodeAbbrev>();
2284 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
2285 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2286 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
2287 CString7Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2288 // Abbrev for CST_CODE_CSTRING.
2289 Abbv = std::make_shared<BitCodeAbbrev>();
2290 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
2291 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2292 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
2293 CString6Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2296 SmallVector<uint64_t, 64> Record;
2298 const ValueEnumerator::ValueList &Vals = VE.getValues();
2299 Type *LastTy = nullptr;
2300 for (unsigned i = FirstVal; i != LastVal; ++i) {
2301 const Value *V = Vals[i].first;
2302 // If we need to switch types, do so now.
2303 if (V->getType() != LastTy) {
2304 LastTy = V->getType();
2305 Record.push_back(VE.getTypeID(LastTy));
2306 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
2307 CONSTANTS_SETTYPE_ABBREV);
2311 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
2312 Record.push_back(unsigned(IA->hasSideEffects()) |
2313 unsigned(IA->isAlignStack()) << 1 |
2314 unsigned(IA->getDialect()&1) << 2);
2316 // Add the asm string.
2317 const std::string &AsmStr = IA->getAsmString();
2318 Record.push_back(AsmStr.size());
2319 Record.append(AsmStr.begin(), AsmStr.end());
2321 // Add the constraint string.
2322 const std::string &ConstraintStr = IA->getConstraintString();
2323 Record.push_back(ConstraintStr.size());
2324 Record.append(ConstraintStr.begin(), ConstraintStr.end());
2325 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
2329 const Constant *C = cast<Constant>(V);
2330 unsigned Code = -1U;
2331 unsigned AbbrevToUse = 0;
2332 if (C->isNullValue()) {
2333 Code = bitc::CST_CODE_NULL;
2334 } else if (isa<UndefValue>(C)) {
2335 Code = bitc::CST_CODE_UNDEF;
2336 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
2337 if (IV->getBitWidth() <= 64) {
2338 uint64_t V = IV->getSExtValue();
2339 emitSignedInt64(Record, V);
2340 Code = bitc::CST_CODE_INTEGER;
2341 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
2342 } else { // Wide integers, > 64 bits in size.
2343 // We have an arbitrary precision integer value to write whose
2344 // bit width is > 64. However, in canonical unsigned integer
2345 // format it is likely that the high bits are going to be zero.
2346 // So, we only write the number of active words.
2347 unsigned NWords = IV->getValue().getActiveWords();
2348 const uint64_t *RawWords = IV->getValue().getRawData();
2349 for (unsigned i = 0; i != NWords; ++i) {
2350 emitSignedInt64(Record, RawWords[i]);
2352 Code = bitc::CST_CODE_WIDE_INTEGER;
2354 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
2355 Code = bitc::CST_CODE_FLOAT;
2356 Type *Ty = CFP->getType();
2357 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) {
2358 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
2359 } else if (Ty->isX86_FP80Ty()) {
2360 // api needed to prevent premature destruction
2361 // bits are not in the same order as a normal i80 APInt, compensate.
2362 APInt api = CFP->getValueAPF().bitcastToAPInt();
2363 const uint64_t *p = api.getRawData();
2364 Record.push_back((p[1] << 48) | (p[0] >> 16));
2365 Record.push_back(p[0] & 0xffffLL);
2366 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
2367 APInt api = CFP->getValueAPF().bitcastToAPInt();
2368 const uint64_t *p = api.getRawData();
2369 Record.push_back(p[0]);
2370 Record.push_back(p[1]);
2372 assert(0 && "Unknown FP type!");
2374 } else if (isa<ConstantDataSequential>(C) &&
2375 cast<ConstantDataSequential>(C)->isString()) {
2376 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
2377 // Emit constant strings specially.
2378 unsigned NumElts = Str->getNumElements();
2379 // If this is a null-terminated string, use the denser CSTRING encoding.
2380 if (Str->isCString()) {
2381 Code = bitc::CST_CODE_CSTRING;
2382 --NumElts; // Don't encode the null, which isn't allowed by char6.
2384 Code = bitc::CST_CODE_STRING;
2385 AbbrevToUse = String8Abbrev;
2387 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
2388 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
2389 for (unsigned i = 0; i != NumElts; ++i) {
2390 unsigned char V = Str->getElementAsInteger(i);
2391 Record.push_back(V);
2392 isCStr7 &= (V & 128) == 0;
2394 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
2398 AbbrevToUse = CString6Abbrev;
2400 AbbrevToUse = CString7Abbrev;
2401 } else if (const ConstantDataSequential *CDS =
2402 dyn_cast<ConstantDataSequential>(C)) {
2403 Code = bitc::CST_CODE_DATA;
2404 Type *EltTy = CDS->getType()->getElementType();
2405 if (isa<IntegerType>(EltTy)) {
2406 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
2407 Record.push_back(CDS->getElementAsInteger(i));
2409 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
2411 CDS->getElementAsAPFloat(i).bitcastToAPInt().getLimitedValue());
2413 } else if (isa<ConstantAggregate>(C)) {
2414 Code = bitc::CST_CODE_AGGREGATE;
2415 for (const Value *Op : C->operands())
2416 Record.push_back(VE.getValueID(Op));
2417 AbbrevToUse = AggregateAbbrev;
2418 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
2419 switch (CE->getOpcode()) {
2421 if (Instruction::isCast(CE->getOpcode())) {
2422 Code = bitc::CST_CODE_CE_CAST;
2423 Record.push_back(getEncodedCastOpcode(CE->getOpcode()));
2424 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2425 Record.push_back(VE.getValueID(C->getOperand(0)));
2426 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
2428 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
2429 Code = bitc::CST_CODE_CE_BINOP;
2430 Record.push_back(getEncodedBinaryOpcode(CE->getOpcode()));
2431 Record.push_back(VE.getValueID(C->getOperand(0)));
2432 Record.push_back(VE.getValueID(C->getOperand(1)));
2433 uint64_t Flags = getOptimizationFlags(CE);
2435 Record.push_back(Flags);
2438 case Instruction::FNeg: {
2439 assert(CE->getNumOperands() == 1 && "Unknown constant expr!");
2440 Code = bitc::CST_CODE_CE_UNOP;
2441 Record.push_back(getEncodedUnaryOpcode(CE->getOpcode()));
2442 Record.push_back(VE.getValueID(C->getOperand(0)));
2443 uint64_t Flags = getOptimizationFlags(CE);
2445 Record.push_back(Flags);
2448 case Instruction::GetElementPtr: {
2449 Code = bitc::CST_CODE_CE_GEP;
2450 const auto *GO = cast<GEPOperator>(C);
2451 Record.push_back(VE.getTypeID(GO->getSourceElementType()));
2452 if (Optional<unsigned> Idx = GO->getInRangeIndex()) {
2453 Code = bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX;
2454 Record.push_back((*Idx << 1) | GO->isInBounds());
2455 } else if (GO->isInBounds())
2456 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
2457 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
2458 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
2459 Record.push_back(VE.getValueID(C->getOperand(i)));
2463 case Instruction::Select:
2464 Code = bitc::CST_CODE_CE_SELECT;
2465 Record.push_back(VE.getValueID(C->getOperand(0)));
2466 Record.push_back(VE.getValueID(C->getOperand(1)));
2467 Record.push_back(VE.getValueID(C->getOperand(2)));
2469 case Instruction::ExtractElement:
2470 Code = bitc::CST_CODE_CE_EXTRACTELT;
2471 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2472 Record.push_back(VE.getValueID(C->getOperand(0)));
2473 Record.push_back(VE.getTypeID(C->getOperand(1)->getType()));
2474 Record.push_back(VE.getValueID(C->getOperand(1)));
2476 case Instruction::InsertElement:
2477 Code = bitc::CST_CODE_CE_INSERTELT;
2478 Record.push_back(VE.getValueID(C->getOperand(0)));
2479 Record.push_back(VE.getValueID(C->getOperand(1)));
2480 Record.push_back(VE.getTypeID(C->getOperand(2)->getType()));
2481 Record.push_back(VE.getValueID(C->getOperand(2)));
2483 case Instruction::ShuffleVector:
2484 // If the return type and argument types are the same, this is a
2485 // standard shufflevector instruction. If the types are different,
2486 // then the shuffle is widening or truncating the input vectors, and
2487 // the argument type must also be encoded.
2488 if (C->getType() == C->getOperand(0)->getType()) {
2489 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
2491 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
2492 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2494 Record.push_back(VE.getValueID(C->getOperand(0)));
2495 Record.push_back(VE.getValueID(C->getOperand(1)));
2496 Record.push_back(VE.getValueID(C->getOperand(2)));
2498 case Instruction::ICmp:
2499 case Instruction::FCmp:
2500 Code = bitc::CST_CODE_CE_CMP;
2501 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2502 Record.push_back(VE.getValueID(C->getOperand(0)));
2503 Record.push_back(VE.getValueID(C->getOperand(1)));
2504 Record.push_back(CE->getPredicate());
2507 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
2508 Code = bitc::CST_CODE_BLOCKADDRESS;
2509 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
2510 Record.push_back(VE.getValueID(BA->getFunction()));
2511 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
2516 llvm_unreachable("Unknown constant!");
2518 Stream.EmitRecord(Code, Record, AbbrevToUse);
2525 void ModuleBitcodeWriter::writeModuleConstants() {
2526 const ValueEnumerator::ValueList &Vals = VE.getValues();
2528 // Find the first constant to emit, which is the first non-globalvalue value.
2529 // We know globalvalues have been emitted by WriteModuleInfo.
2530 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
2531 if (!isa<GlobalValue>(Vals[i].first)) {
2532 writeConstants(i, Vals.size(), true);
2538 /// pushValueAndType - The file has to encode both the value and type id for
2539 /// many values, because we need to know what type to create for forward
2540 /// references. However, most operands are not forward references, so this type
2541 /// field is not needed.
2543 /// This function adds V's value ID to Vals. If the value ID is higher than the
2544 /// instruction ID, then it is a forward reference, and it also includes the
2545 /// type ID. The value ID that is written is encoded relative to the InstID.
2546 bool ModuleBitcodeWriter::pushValueAndType(const Value *V, unsigned InstID,
2547 SmallVectorImpl<unsigned> &Vals) {
2548 unsigned ValID = VE.getValueID(V);
2549 // Make encoding relative to the InstID.
2550 Vals.push_back(InstID - ValID);
2551 if (ValID >= InstID) {
2552 Vals.push_back(VE.getTypeID(V->getType()));
2558 void ModuleBitcodeWriter::writeOperandBundles(ImmutableCallSite CS,
2560 SmallVector<unsigned, 64> Record;
2561 LLVMContext &C = CS.getInstruction()->getContext();
2563 for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i) {
2564 const auto &Bundle = CS.getOperandBundleAt(i);
2565 Record.push_back(C.getOperandBundleTagID(Bundle.getTagName()));
2567 for (auto &Input : Bundle.Inputs)
2568 pushValueAndType(Input, InstID, Record);
2570 Stream.EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record);
2575 /// pushValue - Like pushValueAndType, but where the type of the value is
2576 /// omitted (perhaps it was already encoded in an earlier operand).
2577 void ModuleBitcodeWriter::pushValue(const Value *V, unsigned InstID,
2578 SmallVectorImpl<unsigned> &Vals) {
2579 unsigned ValID = VE.getValueID(V);
2580 Vals.push_back(InstID - ValID);
2583 void ModuleBitcodeWriter::pushValueSigned(const Value *V, unsigned InstID,
2584 SmallVectorImpl<uint64_t> &Vals) {
2585 unsigned ValID = VE.getValueID(V);
2586 int64_t diff = ((int32_t)InstID - (int32_t)ValID);
2587 emitSignedInt64(Vals, diff);
2590 /// WriteInstruction - Emit an instruction to the specified stream.
2591 void ModuleBitcodeWriter::writeInstruction(const Instruction &I,
2593 SmallVectorImpl<unsigned> &Vals) {
2595 unsigned AbbrevToUse = 0;
2596 VE.setInstructionID(&I);
2597 switch (I.getOpcode()) {
2599 if (Instruction::isCast(I.getOpcode())) {
2600 Code = bitc::FUNC_CODE_INST_CAST;
2601 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2602 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
2603 Vals.push_back(VE.getTypeID(I.getType()));
2604 Vals.push_back(getEncodedCastOpcode(I.getOpcode()));
2606 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
2607 Code = bitc::FUNC_CODE_INST_BINOP;
2608 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2609 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
2610 pushValue(I.getOperand(1), InstID, Vals);
2611 Vals.push_back(getEncodedBinaryOpcode(I.getOpcode()));
2612 uint64_t Flags = getOptimizationFlags(&I);
2614 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
2615 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
2616 Vals.push_back(Flags);
2620 case Instruction::FNeg: {
2621 Code = bitc::FUNC_CODE_INST_UNOP;
2622 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2623 AbbrevToUse = FUNCTION_INST_UNOP_ABBREV;
2624 Vals.push_back(getEncodedUnaryOpcode(I.getOpcode()));
2625 uint64_t Flags = getOptimizationFlags(&I);
2627 if (AbbrevToUse == FUNCTION_INST_UNOP_ABBREV)
2628 AbbrevToUse = FUNCTION_INST_UNOP_FLAGS_ABBREV;
2629 Vals.push_back(Flags);
2633 case Instruction::GetElementPtr: {
2634 Code = bitc::FUNC_CODE_INST_GEP;
2635 AbbrevToUse = FUNCTION_INST_GEP_ABBREV;
2636 auto &GEPInst = cast<GetElementPtrInst>(I);
2637 Vals.push_back(GEPInst.isInBounds());
2638 Vals.push_back(VE.getTypeID(GEPInst.getSourceElementType()));
2639 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
2640 pushValueAndType(I.getOperand(i), InstID, Vals);
2643 case Instruction::ExtractValue: {
2644 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
2645 pushValueAndType(I.getOperand(0), InstID, Vals);
2646 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
2647 Vals.append(EVI->idx_begin(), EVI->idx_end());
2650 case Instruction::InsertValue: {
2651 Code = bitc::FUNC_CODE_INST_INSERTVAL;
2652 pushValueAndType(I.getOperand(0), InstID, Vals);
2653 pushValueAndType(I.getOperand(1), InstID, Vals);
2654 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
2655 Vals.append(IVI->idx_begin(), IVI->idx_end());
2658 case Instruction::Select: {
2659 Code = bitc::FUNC_CODE_INST_VSELECT;
2660 pushValueAndType(I.getOperand(1), InstID, Vals);
2661 pushValue(I.getOperand(2), InstID, Vals);
2662 pushValueAndType(I.getOperand(0), InstID, Vals);
2663 uint64_t Flags = getOptimizationFlags(&I);
2665 Vals.push_back(Flags);
2668 case Instruction::ExtractElement:
2669 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
2670 pushValueAndType(I.getOperand(0), InstID, Vals);
2671 pushValueAndType(I.getOperand(1), InstID, Vals);
2673 case Instruction::InsertElement:
2674 Code = bitc::FUNC_CODE_INST_INSERTELT;
2675 pushValueAndType(I.getOperand(0), InstID, Vals);
2676 pushValue(I.getOperand(1), InstID, Vals);
2677 pushValueAndType(I.getOperand(2), InstID, Vals);
2679 case Instruction::ShuffleVector:
2680 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
2681 pushValueAndType(I.getOperand(0), InstID, Vals);
2682 pushValue(I.getOperand(1), InstID, Vals);
2683 pushValue(I.getOperand(2), InstID, Vals);
2685 case Instruction::ICmp:
2686 case Instruction::FCmp: {
2687 // compare returning Int1Ty or vector of Int1Ty
2688 Code = bitc::FUNC_CODE_INST_CMP2;
2689 pushValueAndType(I.getOperand(0), InstID, Vals);
2690 pushValue(I.getOperand(1), InstID, Vals);
2691 Vals.push_back(cast<CmpInst>(I).getPredicate());
2692 uint64_t Flags = getOptimizationFlags(&I);
2694 Vals.push_back(Flags);
2698 case Instruction::Ret:
2700 Code = bitc::FUNC_CODE_INST_RET;
2701 unsigned NumOperands = I.getNumOperands();
2702 if (NumOperands == 0)
2703 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
2704 else if (NumOperands == 1) {
2705 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2706 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
2708 for (unsigned i = 0, e = NumOperands; i != e; ++i)
2709 pushValueAndType(I.getOperand(i), InstID, Vals);
2713 case Instruction::Br:
2715 Code = bitc::FUNC_CODE_INST_BR;
2716 const BranchInst &II = cast<BranchInst>(I);
2717 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
2718 if (II.isConditional()) {
2719 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
2720 pushValue(II.getCondition(), InstID, Vals);
2724 case Instruction::Switch:
2726 Code = bitc::FUNC_CODE_INST_SWITCH;
2727 const SwitchInst &SI = cast<SwitchInst>(I);
2728 Vals.push_back(VE.getTypeID(SI.getCondition()->getType()));
2729 pushValue(SI.getCondition(), InstID, Vals);
2730 Vals.push_back(VE.getValueID(SI.getDefaultDest()));
2731 for (auto Case : SI.cases()) {
2732 Vals.push_back(VE.getValueID(Case.getCaseValue()));
2733 Vals.push_back(VE.getValueID(Case.getCaseSuccessor()));
2737 case Instruction::IndirectBr:
2738 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
2739 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
2740 // Encode the address operand as relative, but not the basic blocks.
2741 pushValue(I.getOperand(0), InstID, Vals);
2742 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i)
2743 Vals.push_back(VE.getValueID(I.getOperand(i)));
2746 case Instruction::Invoke: {
2747 const InvokeInst *II = cast<InvokeInst>(&I);
2748 const Value *Callee = II->getCalledValue();
2749 FunctionType *FTy = II->getFunctionType();
2751 if (II->hasOperandBundles())
2752 writeOperandBundles(II, InstID);
2754 Code = bitc::FUNC_CODE_INST_INVOKE;
2756 Vals.push_back(VE.getAttributeListID(II->getAttributes()));
2757 Vals.push_back(II->getCallingConv() | 1 << 13);
2758 Vals.push_back(VE.getValueID(II->getNormalDest()));
2759 Vals.push_back(VE.getValueID(II->getUnwindDest()));
2760 Vals.push_back(VE.getTypeID(FTy));
2761 pushValueAndType(Callee, InstID, Vals);
2763 // Emit value #'s for the fixed parameters.
2764 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
2765 pushValue(I.getOperand(i), InstID, Vals); // fixed param.
2767 // Emit type/value pairs for varargs params.
2768 if (FTy->isVarArg()) {
2769 for (unsigned i = FTy->getNumParams(), e = II->getNumArgOperands();
2771 pushValueAndType(I.getOperand(i), InstID, Vals); // vararg
2775 case Instruction::Resume:
2776 Code = bitc::FUNC_CODE_INST_RESUME;
2777 pushValueAndType(I.getOperand(0), InstID, Vals);
2779 case Instruction::CleanupRet: {
2780 Code = bitc::FUNC_CODE_INST_CLEANUPRET;
2781 const auto &CRI = cast<CleanupReturnInst>(I);
2782 pushValue(CRI.getCleanupPad(), InstID, Vals);
2783 if (CRI.hasUnwindDest())
2784 Vals.push_back(VE.getValueID(CRI.getUnwindDest()));
2787 case Instruction::CatchRet: {
2788 Code = bitc::FUNC_CODE_INST_CATCHRET;
2789 const auto &CRI = cast<CatchReturnInst>(I);
2790 pushValue(CRI.getCatchPad(), InstID, Vals);
2791 Vals.push_back(VE.getValueID(CRI.getSuccessor()));
2794 case Instruction::CleanupPad:
2795 case Instruction::CatchPad: {
2796 const auto &FuncletPad = cast<FuncletPadInst>(I);
2797 Code = isa<CatchPadInst>(FuncletPad) ? bitc::FUNC_CODE_INST_CATCHPAD
2798 : bitc::FUNC_CODE_INST_CLEANUPPAD;
2799 pushValue(FuncletPad.getParentPad(), InstID, Vals);
2801 unsigned NumArgOperands = FuncletPad.getNumArgOperands();
2802 Vals.push_back(NumArgOperands);
2803 for (unsigned Op = 0; Op != NumArgOperands; ++Op)
2804 pushValueAndType(FuncletPad.getArgOperand(Op), InstID, Vals);
2807 case Instruction::CatchSwitch: {
2808 Code = bitc::FUNC_CODE_INST_CATCHSWITCH;
2809 const auto &CatchSwitch = cast<CatchSwitchInst>(I);
2811 pushValue(CatchSwitch.getParentPad(), InstID, Vals);
2813 unsigned NumHandlers = CatchSwitch.getNumHandlers();
2814 Vals.push_back(NumHandlers);
2815 for (const BasicBlock *CatchPadBB : CatchSwitch.handlers())
2816 Vals.push_back(VE.getValueID(CatchPadBB));
2818 if (CatchSwitch.hasUnwindDest())
2819 Vals.push_back(VE.getValueID(CatchSwitch.getUnwindDest()));
2822 case Instruction::CallBr: {
2823 const CallBrInst *CBI = cast<CallBrInst>(&I);
2824 const Value *Callee = CBI->getCalledValue();
2825 FunctionType *FTy = CBI->getFunctionType();
2827 if (CBI->hasOperandBundles())
2828 writeOperandBundles(CBI, InstID);
2830 Code = bitc::FUNC_CODE_INST_CALLBR;
2832 Vals.push_back(VE.getAttributeListID(CBI->getAttributes()));
2834 Vals.push_back(CBI->getCallingConv() << bitc::CALL_CCONV |
2835 1 << bitc::CALL_EXPLICIT_TYPE);
2837 Vals.push_back(VE.getValueID(CBI->getDefaultDest()));
2838 Vals.push_back(CBI->getNumIndirectDests());
2839 for (unsigned i = 0, e = CBI->getNumIndirectDests(); i != e; ++i)
2840 Vals.push_back(VE.getValueID(CBI->getIndirectDest(i)));
2842 Vals.push_back(VE.getTypeID(FTy));
2843 pushValueAndType(Callee, InstID, Vals);
2845 // Emit value #'s for the fixed parameters.
2846 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
2847 pushValue(I.getOperand(i), InstID, Vals); // fixed param.
2849 // Emit type/value pairs for varargs params.
2850 if (FTy->isVarArg()) {
2851 for (unsigned i = FTy->getNumParams(), e = CBI->getNumArgOperands();
2853 pushValueAndType(I.getOperand(i), InstID, Vals); // vararg
2857 case Instruction::Unreachable:
2858 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
2859 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
2862 case Instruction::PHI: {
2863 const PHINode &PN = cast<PHINode>(I);
2864 Code = bitc::FUNC_CODE_INST_PHI;
2865 // With the newer instruction encoding, forward references could give
2866 // negative valued IDs. This is most common for PHIs, so we use
2868 SmallVector<uint64_t, 128> Vals64;
2869 Vals64.push_back(VE.getTypeID(PN.getType()));
2870 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
2871 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64);
2872 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i)));
2874 // Emit a Vals64 vector and exit.
2875 Stream.EmitRecord(Code, Vals64, AbbrevToUse);
2880 case Instruction::LandingPad: {
2881 const LandingPadInst &LP = cast<LandingPadInst>(I);
2882 Code = bitc::FUNC_CODE_INST_LANDINGPAD;
2883 Vals.push_back(VE.getTypeID(LP.getType()));
2884 Vals.push_back(LP.isCleanup());
2885 Vals.push_back(LP.getNumClauses());
2886 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) {
2888 Vals.push_back(LandingPadInst::Catch);
2890 Vals.push_back(LandingPadInst::Filter);
2891 pushValueAndType(LP.getClause(I), InstID, Vals);
2896 case Instruction::Alloca: {
2897 Code = bitc::FUNC_CODE_INST_ALLOCA;
2898 const AllocaInst &AI = cast<AllocaInst>(I);
2899 Vals.push_back(VE.getTypeID(AI.getAllocatedType()));
2900 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
2901 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
2902 unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1;
2903 assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 &&
2904 "not enough bits for maximum alignment");
2905 assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64");
2906 AlignRecord |= AI.isUsedWithInAlloca() << 5;
2907 AlignRecord |= 1 << 6;
2908 AlignRecord |= AI.isSwiftError() << 7;
2909 Vals.push_back(AlignRecord);
2913 case Instruction::Load:
2914 if (cast<LoadInst>(I).isAtomic()) {
2915 Code = bitc::FUNC_CODE_INST_LOADATOMIC;
2916 pushValueAndType(I.getOperand(0), InstID, Vals);
2918 Code = bitc::FUNC_CODE_INST_LOAD;
2919 if (!pushValueAndType(I.getOperand(0), InstID, Vals)) // ptr
2920 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
2922 Vals.push_back(VE.getTypeID(I.getType()));
2923 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
2924 Vals.push_back(cast<LoadInst>(I).isVolatile());
2925 if (cast<LoadInst>(I).isAtomic()) {
2926 Vals.push_back(getEncodedOrdering(cast<LoadInst>(I).getOrdering()));
2927 Vals.push_back(getEncodedSyncScopeID(cast<LoadInst>(I).getSyncScopeID()));
2930 case Instruction::Store:
2931 if (cast<StoreInst>(I).isAtomic())
2932 Code = bitc::FUNC_CODE_INST_STOREATOMIC;
2934 Code = bitc::FUNC_CODE_INST_STORE;
2935 pushValueAndType(I.getOperand(1), InstID, Vals); // ptrty + ptr
2936 pushValueAndType(I.getOperand(0), InstID, Vals); // valty + val
2937 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
2938 Vals.push_back(cast<StoreInst>(I).isVolatile());
2939 if (cast<StoreInst>(I).isAtomic()) {
2940 Vals.push_back(getEncodedOrdering(cast<StoreInst>(I).getOrdering()));
2942 getEncodedSyncScopeID(cast<StoreInst>(I).getSyncScopeID()));
2945 case Instruction::AtomicCmpXchg:
2946 Code = bitc::FUNC_CODE_INST_CMPXCHG;
2947 pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
2948 pushValueAndType(I.getOperand(1), InstID, Vals); // cmp.
2949 pushValue(I.getOperand(2), InstID, Vals); // newval.
2950 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile());
2952 getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getSuccessOrdering()));
2954 getEncodedSyncScopeID(cast<AtomicCmpXchgInst>(I).getSyncScopeID()));
2956 getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getFailureOrdering()));
2957 Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak());
2959 case Instruction::AtomicRMW:
2960 Code = bitc::FUNC_CODE_INST_ATOMICRMW;
2961 pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
2962 pushValue(I.getOperand(1), InstID, Vals); // val.
2964 getEncodedRMWOperation(cast<AtomicRMWInst>(I).getOperation()));
2965 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile());
2966 Vals.push_back(getEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering()));
2968 getEncodedSyncScopeID(cast<AtomicRMWInst>(I).getSyncScopeID()));
2970 case Instruction::Fence:
2971 Code = bitc::FUNC_CODE_INST_FENCE;
2972 Vals.push_back(getEncodedOrdering(cast<FenceInst>(I).getOrdering()));
2973 Vals.push_back(getEncodedSyncScopeID(cast<FenceInst>(I).getSyncScopeID()));
2975 case Instruction::Call: {
2976 const CallInst &CI = cast<CallInst>(I);
2977 FunctionType *FTy = CI.getFunctionType();
2979 if (CI.hasOperandBundles())
2980 writeOperandBundles(&CI, InstID);
2982 Code = bitc::FUNC_CODE_INST_CALL;
2984 Vals.push_back(VE.getAttributeListID(CI.getAttributes()));
2986 unsigned Flags = getOptimizationFlags(&I);
2987 Vals.push_back(CI.getCallingConv() << bitc::CALL_CCONV |
2988 unsigned(CI.isTailCall()) << bitc::CALL_TAIL |
2989 unsigned(CI.isMustTailCall()) << bitc::CALL_MUSTTAIL |
2990 1 << bitc::CALL_EXPLICIT_TYPE |
2991 unsigned(CI.isNoTailCall()) << bitc::CALL_NOTAIL |
2992 unsigned(Flags != 0) << bitc::CALL_FMF);
2994 Vals.push_back(Flags);
2996 Vals.push_back(VE.getTypeID(FTy));
2997 pushValueAndType(CI.getCalledValue(), InstID, Vals); // Callee
2999 // Emit value #'s for the fixed parameters.
3000 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) {
3001 // Check for labels (can happen with asm labels).
3002 if (FTy->getParamType(i)->isLabelTy())
3003 Vals.push_back(VE.getValueID(CI.getArgOperand(i)));
3005 pushValue(CI.getArgOperand(i), InstID, Vals); // fixed param.
3008 // Emit type/value pairs for varargs params.
3009 if (FTy->isVarArg()) {
3010 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
3012 pushValueAndType(CI.getArgOperand(i), InstID, Vals); // varargs
3016 case Instruction::VAArg:
3017 Code = bitc::FUNC_CODE_INST_VAARG;
3018 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
3019 pushValue(I.getOperand(0), InstID, Vals); // valist.
3020 Vals.push_back(VE.getTypeID(I.getType())); // restype.
3024 Stream.EmitRecord(Code, Vals, AbbrevToUse);
3028 /// Write a GlobalValue VST to the module. The purpose of this data structure is
3029 /// to allow clients to efficiently find the function body.
3030 void ModuleBitcodeWriter::writeGlobalValueSymbolTable(
3031 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
3032 // Get the offset of the VST we are writing, and backpatch it into
3033 // the VST forward declaration record.
3034 uint64_t VSTOffset = Stream.GetCurrentBitNo();
3035 // The BitcodeStartBit was the stream offset of the identification block.
3036 VSTOffset -= bitcodeStartBit();
3037 assert((VSTOffset & 31) == 0 && "VST block not 32-bit aligned");
3038 // Note that we add 1 here because the offset is relative to one word
3039 // before the start of the identification block, which was historically
3040 // always the start of the regular bitcode header.
3041 Stream.BackpatchWord(VSTOffsetPlaceholder, VSTOffset / 32 + 1);
3043 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
3045 auto Abbv = std::make_shared<BitCodeAbbrev>();
3046 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_FNENTRY));
3047 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
3048 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset
3049 unsigned FnEntryAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3051 for (const Function &F : M) {
3054 if (F.isDeclaration())
3057 Record[0] = VE.getValueID(&F);
3059 // Save the word offset of the function (from the start of the
3060 // actual bitcode written to the stream).
3061 uint64_t BitcodeIndex = FunctionToBitcodeIndex[&F] - bitcodeStartBit();
3062 assert((BitcodeIndex & 31) == 0 && "function block not 32-bit aligned");
3063 // Note that we add 1 here because the offset is relative to one word
3064 // before the start of the identification block, which was historically
3065 // always the start of the regular bitcode header.
3066 Record[1] = BitcodeIndex / 32 + 1;
3068 Stream.EmitRecord(bitc::VST_CODE_FNENTRY, Record, FnEntryAbbrev);
3074 /// Emit names for arguments, instructions and basic blocks in a function.
3075 void ModuleBitcodeWriter::writeFunctionLevelValueSymbolTable(
3076 const ValueSymbolTable &VST) {
3080 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
3082 // FIXME: Set up the abbrev, we know how many values there are!
3083 // FIXME: We know if the type names can use 7-bit ascii.
3084 SmallVector<uint64_t, 64> NameVals;
3086 for (const ValueName &Name : VST) {
3087 // Figure out the encoding to use for the name.
3088 StringEncoding Bits = getStringEncoding(Name.getKey());
3090 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
3091 NameVals.push_back(VE.getValueID(Name.getValue()));
3093 // VST_CODE_ENTRY: [valueid, namechar x N]
3094 // VST_CODE_BBENTRY: [bbid, namechar x N]
3096 if (isa<BasicBlock>(Name.getValue())) {
3097 Code = bitc::VST_CODE_BBENTRY;
3098 if (Bits == SE_Char6)
3099 AbbrevToUse = VST_BBENTRY_6_ABBREV;
3101 Code = bitc::VST_CODE_ENTRY;
3102 if (Bits == SE_Char6)
3103 AbbrevToUse = VST_ENTRY_6_ABBREV;
3104 else if (Bits == SE_Fixed7)
3105 AbbrevToUse = VST_ENTRY_7_ABBREV;
3108 for (const auto P : Name.getKey())
3109 NameVals.push_back((unsigned char)P);
3111 // Emit the finished record.
3112 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
3119 void ModuleBitcodeWriter::writeUseList(UseListOrder &&Order) {
3120 assert(Order.Shuffle.size() >= 2 && "Shuffle too small");
3122 if (isa<BasicBlock>(Order.V))
3123 Code = bitc::USELIST_CODE_BB;
3125 Code = bitc::USELIST_CODE_DEFAULT;
3127 SmallVector<uint64_t, 64> Record(Order.Shuffle.begin(), Order.Shuffle.end());
3128 Record.push_back(VE.getValueID(Order.V));
3129 Stream.EmitRecord(Code, Record);
3132 void ModuleBitcodeWriter::writeUseListBlock(const Function *F) {
3133 assert(VE.shouldPreserveUseListOrder() &&
3134 "Expected to be preserving use-list order");
3136 auto hasMore = [&]() {
3137 return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
3143 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
3145 writeUseList(std::move(VE.UseListOrders.back()));
3146 VE.UseListOrders.pop_back();
3151 /// Emit a function body to the module stream.
3152 void ModuleBitcodeWriter::writeFunction(
3154 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
3155 // Save the bitcode index of the start of this function block for recording
3157 FunctionToBitcodeIndex[&F] = Stream.GetCurrentBitNo();
3159 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
3160 VE.incorporateFunction(F);
3162 SmallVector<unsigned, 64> Vals;
3164 // Emit the number of basic blocks, so the reader can create them ahead of
3166 Vals.push_back(VE.getBasicBlocks().size());
3167 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
3170 // If there are function-local constants, emit them now.
3171 unsigned CstStart, CstEnd;
3172 VE.getFunctionConstantRange(CstStart, CstEnd);
3173 writeConstants(CstStart, CstEnd, false);
3175 // If there is function-local metadata, emit it now.
3176 writeFunctionMetadata(F);
3178 // Keep a running idea of what the instruction ID is.
3179 unsigned InstID = CstEnd;
3181 bool NeedsMetadataAttachment = F.hasMetadata();
3183 DILocation *LastDL = nullptr;
3184 // Finally, emit all the instructions, in order.
3185 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
3186 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
3188 writeInstruction(*I, InstID, Vals);
3190 if (!I->getType()->isVoidTy())
3193 // If the instruction has metadata, write a metadata attachment later.
3194 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
3196 // If the instruction has a debug location, emit it.
3197 DILocation *DL = I->getDebugLoc();
3202 // Just repeat the same debug loc as last time.
3203 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
3207 Vals.push_back(DL->getLine());
3208 Vals.push_back(DL->getColumn());
3209 Vals.push_back(VE.getMetadataOrNullID(DL->getScope()));
3210 Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt()));
3211 Vals.push_back(DL->isImplicitCode());
3212 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
3218 // Emit names for all the instructions etc.
3219 if (auto *Symtab = F.getValueSymbolTable())
3220 writeFunctionLevelValueSymbolTable(*Symtab);
3222 if (NeedsMetadataAttachment)
3223 writeFunctionMetadataAttachment(F);
3224 if (VE.shouldPreserveUseListOrder())
3225 writeUseListBlock(&F);
3230 // Emit blockinfo, which defines the standard abbreviations etc.
3231 void ModuleBitcodeWriter::writeBlockInfo() {
3232 // We only want to emit block info records for blocks that have multiple
3233 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK.
3234 // Other blocks can define their abbrevs inline.
3235 Stream.EnterBlockInfoBlock();
3237 { // 8-bit fixed-width VST_CODE_ENTRY/VST_CODE_BBENTRY strings.
3238 auto Abbv = std::make_shared<BitCodeAbbrev>();
3239 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
3240 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3241 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3242 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
3243 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
3245 llvm_unreachable("Unexpected abbrev ordering!");
3248 { // 7-bit fixed width VST_CODE_ENTRY strings.
3249 auto Abbv = std::make_shared<BitCodeAbbrev>();
3250 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
3251 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3252 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3253 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
3254 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
3256 llvm_unreachable("Unexpected abbrev ordering!");
3258 { // 6-bit char6 VST_CODE_ENTRY strings.
3259 auto Abbv = std::make_shared<BitCodeAbbrev>();
3260 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
3261 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3262 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3263 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3264 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
3266 llvm_unreachable("Unexpected abbrev ordering!");
3268 { // 6-bit char6 VST_CODE_BBENTRY strings.
3269 auto Abbv = std::make_shared<BitCodeAbbrev>();
3270 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
3271 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3272 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3273 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3274 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
3275 VST_BBENTRY_6_ABBREV)
3276 llvm_unreachable("Unexpected abbrev ordering!");
3279 { // SETTYPE abbrev for CONSTANTS_BLOCK.
3280 auto Abbv = std::make_shared<BitCodeAbbrev>();
3281 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
3282 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
3283 VE.computeBitsRequiredForTypeIndicies()));
3284 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3285 CONSTANTS_SETTYPE_ABBREV)
3286 llvm_unreachable("Unexpected abbrev ordering!");
3289 { // INTEGER abbrev for CONSTANTS_BLOCK.
3290 auto Abbv = std::make_shared<BitCodeAbbrev>();
3291 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
3292 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3293 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3294 CONSTANTS_INTEGER_ABBREV)
3295 llvm_unreachable("Unexpected abbrev ordering!");
3298 { // CE_CAST abbrev for CONSTANTS_BLOCK.
3299 auto Abbv = std::make_shared<BitCodeAbbrev>();
3300 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
3301 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
3302 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
3303 VE.computeBitsRequiredForTypeIndicies()));
3304 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
3306 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3307 CONSTANTS_CE_CAST_Abbrev)
3308 llvm_unreachable("Unexpected abbrev ordering!");
3310 { // NULL abbrev for CONSTANTS_BLOCK.
3311 auto Abbv = std::make_shared<BitCodeAbbrev>();
3312 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
3313 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3314 CONSTANTS_NULL_Abbrev)
3315 llvm_unreachable("Unexpected abbrev ordering!");
3318 // FIXME: This should only use space for first class types!
3320 { // INST_LOAD abbrev for FUNCTION_BLOCK.
3321 auto Abbv = std::make_shared<BitCodeAbbrev>();
3322 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
3323 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
3324 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3325 VE.computeBitsRequiredForTypeIndicies()));
3326 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
3327 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
3328 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3329 FUNCTION_INST_LOAD_ABBREV)
3330 llvm_unreachable("Unexpected abbrev ordering!");
3332 { // INST_UNOP abbrev for FUNCTION_BLOCK.
3333 auto Abbv = std::make_shared<BitCodeAbbrev>();
3334 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP));
3335 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3336 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3337 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3338 FUNCTION_INST_UNOP_ABBREV)
3339 llvm_unreachable("Unexpected abbrev ordering!");
3341 { // INST_UNOP_FLAGS abbrev for FUNCTION_BLOCK.
3342 auto Abbv = std::make_shared<BitCodeAbbrev>();
3343 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP));
3344 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3345 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3346 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); // flags
3347 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3348 FUNCTION_INST_UNOP_FLAGS_ABBREV)
3349 llvm_unreachable("Unexpected abbrev ordering!");
3351 { // INST_BINOP abbrev for FUNCTION_BLOCK.
3352 auto Abbv = std::make_shared<BitCodeAbbrev>();
3353 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
3354 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3355 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
3356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3357 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3358 FUNCTION_INST_BINOP_ABBREV)
3359 llvm_unreachable("Unexpected abbrev ordering!");
3361 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
3362 auto Abbv = std::make_shared<BitCodeAbbrev>();
3363 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
3364 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3365 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
3366 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3367 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); // flags
3368 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3369 FUNCTION_INST_BINOP_FLAGS_ABBREV)
3370 llvm_unreachable("Unexpected abbrev ordering!");
3372 { // INST_CAST abbrev for FUNCTION_BLOCK.
3373 auto Abbv = std::make_shared<BitCodeAbbrev>();
3374 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
3375 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
3376 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3377 VE.computeBitsRequiredForTypeIndicies()));
3378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3379 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3380 FUNCTION_INST_CAST_ABBREV)
3381 llvm_unreachable("Unexpected abbrev ordering!");
3384 { // INST_RET abbrev for FUNCTION_BLOCK.
3385 auto Abbv = std::make_shared<BitCodeAbbrev>();
3386 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
3387 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3388 FUNCTION_INST_RET_VOID_ABBREV)
3389 llvm_unreachable("Unexpected abbrev ordering!");
3391 { // INST_RET abbrev for FUNCTION_BLOCK.
3392 auto Abbv = std::make_shared<BitCodeAbbrev>();
3393 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
3394 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
3395 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3396 FUNCTION_INST_RET_VAL_ABBREV)
3397 llvm_unreachable("Unexpected abbrev ordering!");
3399 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
3400 auto Abbv = std::make_shared<BitCodeAbbrev>();
3401 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
3402 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3403 FUNCTION_INST_UNREACHABLE_ABBREV)
3404 llvm_unreachable("Unexpected abbrev ordering!");
3407 auto Abbv = std::make_shared<BitCodeAbbrev>();
3408 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_GEP));
3409 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
3410 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3411 Log2_32_Ceil(VE.getTypes().size() + 1)));
3412 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3413 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
3414 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3415 FUNCTION_INST_GEP_ABBREV)
3416 llvm_unreachable("Unexpected abbrev ordering!");
3422 /// Write the module path strings, currently only used when generating
3423 /// a combined index file.
3424 void IndexBitcodeWriter::writeModStrings() {
3425 Stream.EnterSubblock(bitc::MODULE_STRTAB_BLOCK_ID, 3);
3427 // TODO: See which abbrev sizes we actually need to emit
3429 // 8-bit fixed-width MST_ENTRY strings.
3430 auto Abbv = std::make_shared<BitCodeAbbrev>();
3431 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3432 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3433 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3434 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
3435 unsigned Abbrev8Bit = Stream.EmitAbbrev(std::move(Abbv));
3437 // 7-bit fixed width MST_ENTRY strings.
3438 Abbv = std::make_shared<BitCodeAbbrev>();
3439 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3440 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3441 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3442 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
3443 unsigned Abbrev7Bit = Stream.EmitAbbrev(std::move(Abbv));
3445 // 6-bit char6 MST_ENTRY strings.
3446 Abbv = std::make_shared<BitCodeAbbrev>();
3447 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3448 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3449 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3450 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3451 unsigned Abbrev6Bit = Stream.EmitAbbrev(std::move(Abbv));
3453 // Module Hash, 160 bits SHA1. Optionally, emitted after each MST_CODE_ENTRY.
3454 Abbv = std::make_shared<BitCodeAbbrev>();
3455 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_HASH));
3456 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3457 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3458 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3459 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3460 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3461 unsigned AbbrevHash = Stream.EmitAbbrev(std::move(Abbv));
3463 SmallVector<unsigned, 64> Vals;
3465 [&](const StringMapEntry<std::pair<uint64_t, ModuleHash>> &MPSE) {
3466 StringRef Key = MPSE.getKey();
3467 const auto &Value = MPSE.getValue();
3468 StringEncoding Bits = getStringEncoding(Key);
3469 unsigned AbbrevToUse = Abbrev8Bit;
3470 if (Bits == SE_Char6)
3471 AbbrevToUse = Abbrev6Bit;
3472 else if (Bits == SE_Fixed7)
3473 AbbrevToUse = Abbrev7Bit;
3475 Vals.push_back(Value.first);
3476 Vals.append(Key.begin(), Key.end());
3478 // Emit the finished record.
3479 Stream.EmitRecord(bitc::MST_CODE_ENTRY, Vals, AbbrevToUse);
3481 // Emit an optional hash for the module now
3482 const auto &Hash = Value.second;
3483 if (llvm::any_of(Hash, [](uint32_t H) { return H; })) {
3484 Vals.assign(Hash.begin(), Hash.end());
3485 // Emit the hash record.
3486 Stream.EmitRecord(bitc::MST_CODE_HASH, Vals, AbbrevHash);
3494 /// Write the function type metadata related records that need to appear before
3495 /// a function summary entry (whether per-module or combined).
3496 static void writeFunctionTypeMetadataRecords(BitstreamWriter &Stream,
3497 FunctionSummary *FS) {
3498 if (!FS->type_tests().empty())
3499 Stream.EmitRecord(bitc::FS_TYPE_TESTS, FS->type_tests());
3501 SmallVector<uint64_t, 64> Record;
3503 auto WriteVFuncIdVec = [&](uint64_t Ty,
3504 ArrayRef<FunctionSummary::VFuncId> VFs) {
3508 for (auto &VF : VFs) {
3509 Record.push_back(VF.GUID);
3510 Record.push_back(VF.Offset);
3512 Stream.EmitRecord(Ty, Record);
3515 WriteVFuncIdVec(bitc::FS_TYPE_TEST_ASSUME_VCALLS,
3516 FS->type_test_assume_vcalls());
3517 WriteVFuncIdVec(bitc::FS_TYPE_CHECKED_LOAD_VCALLS,
3518 FS->type_checked_load_vcalls());
3520 auto WriteConstVCallVec = [&](uint64_t Ty,
3521 ArrayRef<FunctionSummary::ConstVCall> VCs) {
3522 for (auto &VC : VCs) {
3524 Record.push_back(VC.VFunc.GUID);
3525 Record.push_back(VC.VFunc.Offset);
3526 Record.insert(Record.end(), VC.Args.begin(), VC.Args.end());
3527 Stream.EmitRecord(Ty, Record);
3531 WriteConstVCallVec(bitc::FS_TYPE_TEST_ASSUME_CONST_VCALL,
3532 FS->type_test_assume_const_vcalls());
3533 WriteConstVCallVec(bitc::FS_TYPE_CHECKED_LOAD_CONST_VCALL,
3534 FS->type_checked_load_const_vcalls());
3537 /// Collect type IDs from type tests used by function.
3539 getReferencedTypeIds(FunctionSummary *FS,
3540 std::set<GlobalValue::GUID> &ReferencedTypeIds) {
3541 if (!FS->type_tests().empty())
3542 for (auto &TT : FS->type_tests())
3543 ReferencedTypeIds.insert(TT);
3545 auto GetReferencedTypesFromVFuncIdVec =
3546 [&](ArrayRef<FunctionSummary::VFuncId> VFs) {
3547 for (auto &VF : VFs)
3548 ReferencedTypeIds.insert(VF.GUID);
3551 GetReferencedTypesFromVFuncIdVec(FS->type_test_assume_vcalls());
3552 GetReferencedTypesFromVFuncIdVec(FS->type_checked_load_vcalls());
3554 auto GetReferencedTypesFromConstVCallVec =
3555 [&](ArrayRef<FunctionSummary::ConstVCall> VCs) {
3556 for (auto &VC : VCs)
3557 ReferencedTypeIds.insert(VC.VFunc.GUID);
3560 GetReferencedTypesFromConstVCallVec(FS->type_test_assume_const_vcalls());
3561 GetReferencedTypesFromConstVCallVec(FS->type_checked_load_const_vcalls());
3564 static void writeWholeProgramDevirtResolutionByArg(
3565 SmallVector<uint64_t, 64> &NameVals, const std::vector<uint64_t> &args,
3566 const WholeProgramDevirtResolution::ByArg &ByArg) {
3567 NameVals.push_back(args.size());
3568 NameVals.insert(NameVals.end(), args.begin(), args.end());
3570 NameVals.push_back(ByArg.TheKind);
3571 NameVals.push_back(ByArg.Info);
3572 NameVals.push_back(ByArg.Byte);
3573 NameVals.push_back(ByArg.Bit);
3576 static void writeWholeProgramDevirtResolution(
3577 SmallVector<uint64_t, 64> &NameVals, StringTableBuilder &StrtabBuilder,
3578 uint64_t Id, const WholeProgramDevirtResolution &Wpd) {
3579 NameVals.push_back(Id);
3581 NameVals.push_back(Wpd.TheKind);
3582 NameVals.push_back(StrtabBuilder.add(Wpd.SingleImplName));
3583 NameVals.push_back(Wpd.SingleImplName.size());
3585 NameVals.push_back(Wpd.ResByArg.size());
3586 for (auto &A : Wpd.ResByArg)
3587 writeWholeProgramDevirtResolutionByArg(NameVals, A.first, A.second);
3590 static void writeTypeIdSummaryRecord(SmallVector<uint64_t, 64> &NameVals,
3591 StringTableBuilder &StrtabBuilder,
3592 const std::string &Id,
3593 const TypeIdSummary &Summary) {
3594 NameVals.push_back(StrtabBuilder.add(Id));
3595 NameVals.push_back(Id.size());
3597 NameVals.push_back(Summary.TTRes.TheKind);
3598 NameVals.push_back(Summary.TTRes.SizeM1BitWidth);
3599 NameVals.push_back(Summary.TTRes.AlignLog2);
3600 NameVals.push_back(Summary.TTRes.SizeM1);
3601 NameVals.push_back(Summary.TTRes.BitMask);
3602 NameVals.push_back(Summary.TTRes.InlineBits);
3604 for (auto &W : Summary.WPDRes)
3605 writeWholeProgramDevirtResolution(NameVals, StrtabBuilder, W.first,
3609 static void writeTypeIdCompatibleVtableSummaryRecord(
3610 SmallVector<uint64_t, 64> &NameVals, StringTableBuilder &StrtabBuilder,
3611 const std::string &Id, const TypeIdCompatibleVtableInfo &Summary,
3612 ValueEnumerator &VE) {
3613 NameVals.push_back(StrtabBuilder.add(Id));
3614 NameVals.push_back(Id.size());
3616 for (auto &P : Summary) {
3617 NameVals.push_back(P.AddressPointOffset);
3618 NameVals.push_back(VE.getValueID(P.VTableVI.getValue()));
3622 // Helper to emit a single function summary record.
3623 void ModuleBitcodeWriterBase::writePerModuleFunctionSummaryRecord(
3624 SmallVector<uint64_t, 64> &NameVals, GlobalValueSummary *Summary,
3625 unsigned ValueID, unsigned FSCallsAbbrev, unsigned FSCallsProfileAbbrev,
3626 const Function &F) {
3627 NameVals.push_back(ValueID);
3629 FunctionSummary *FS = cast<FunctionSummary>(Summary);
3630 writeFunctionTypeMetadataRecords(Stream, FS);
3632 NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
3633 NameVals.push_back(FS->instCount());
3634 NameVals.push_back(getEncodedFFlags(FS->fflags()));
3635 NameVals.push_back(FS->refs().size());
3636 NameVals.push_back(FS->immutableRefCount());
3638 for (auto &RI : FS->refs())
3639 NameVals.push_back(VE.getValueID(RI.getValue()));
3641 bool HasProfileData =
3642 F.hasProfileData() || ForceSummaryEdgesCold != FunctionSummary::FSHT_None;
3643 for (auto &ECI : FS->calls()) {
3644 NameVals.push_back(getValueId(ECI.first));
3646 NameVals.push_back(static_cast<uint8_t>(ECI.second.Hotness));
3647 else if (WriteRelBFToSummary)
3648 NameVals.push_back(ECI.second.RelBlockFreq);
3651 unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
3653 (HasProfileData ? bitc::FS_PERMODULE_PROFILE
3654 : (WriteRelBFToSummary ? bitc::FS_PERMODULE_RELBF
3655 : bitc::FS_PERMODULE));
3657 // Emit the finished record.
3658 Stream.EmitRecord(Code, NameVals, FSAbbrev);
3662 // Collect the global value references in the given variable's initializer,
3663 // and emit them in a summary record.
3664 void ModuleBitcodeWriterBase::writeModuleLevelReferences(
3665 const GlobalVariable &V, SmallVector<uint64_t, 64> &NameVals,
3666 unsigned FSModRefsAbbrev, unsigned FSModVTableRefsAbbrev) {
3667 auto VI = Index->getValueInfo(V.getGUID());
3668 if (!VI || VI.getSummaryList().empty()) {
3669 // Only declarations should not have a summary (a declaration might however
3670 // have a summary if the def was in module level asm).
3671 assert(V.isDeclaration());
3674 auto *Summary = VI.getSummaryList()[0].get();
3675 NameVals.push_back(VE.getValueID(&V));
3676 GlobalVarSummary *VS = cast<GlobalVarSummary>(Summary);
3677 NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
3678 NameVals.push_back(getEncodedGVarFlags(VS->varflags()));
3680 auto VTableFuncs = VS->vTableFuncs();
3681 if (!VTableFuncs.empty())
3682 NameVals.push_back(VS->refs().size());
3684 unsigned SizeBeforeRefs = NameVals.size();
3685 for (auto &RI : VS->refs())
3686 NameVals.push_back(VE.getValueID(RI.getValue()));
3687 // Sort the refs for determinism output, the vector returned by FS->refs() has
3688 // been initialized from a DenseSet.
3689 llvm::sort(NameVals.begin() + SizeBeforeRefs, NameVals.end());
3691 if (!VTableFuncs.empty()) {
3692 // VTableFuncs pairs should already be sorted by offset.
3693 for (auto &P : VTableFuncs) {
3694 NameVals.push_back(VE.getValueID(P.FuncVI.getValue()));
3695 NameVals.push_back(P.VTableOffset);
3699 if (VTableFuncs.empty())
3700 Stream.EmitRecord(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS, NameVals,
3703 Stream.EmitRecord(bitc::FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS, NameVals,
3704 FSModVTableRefsAbbrev);
3708 // Current version for the summary.
3709 // This is bumped whenever we introduce changes in the way some record are
3710 // interpreted, like flags for instance.
3711 static const uint64_t INDEX_VERSION = 6;
3713 /// Emit the per-module summary section alongside the rest of
3714 /// the module's bitcode.
3715 void ModuleBitcodeWriterBase::writePerModuleGlobalValueSummary() {
3716 // By default we compile with ThinLTO if the module has a summary, but the
3717 // client can request full LTO with a module flag.
3718 bool IsThinLTO = true;
3720 mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("ThinLTO")))
3721 IsThinLTO = MD->getZExtValue();
3722 Stream.EnterSubblock(IsThinLTO ? bitc::GLOBALVAL_SUMMARY_BLOCK_ID
3723 : bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID,
3726 Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
3728 // Write the index flags.
3730 // Bits 1-3 are set only in the combined index, skip them.
3731 if (Index->enableSplitLTOUnit())
3733 Stream.EmitRecord(bitc::FS_FLAGS, ArrayRef<uint64_t>{Flags});
3735 if (Index->begin() == Index->end()) {
3740 for (const auto &GVI : valueIds()) {
3741 Stream.EmitRecord(bitc::FS_VALUE_GUID,
3742 ArrayRef<uint64_t>{GVI.second, GVI.first});
3745 // Abbrev for FS_PERMODULE_PROFILE.
3746 auto Abbv = std::make_shared<BitCodeAbbrev>();
3747 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_PROFILE));
3748 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3749 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3750 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3751 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
3752 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3753 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
3754 // numrefs x valueid, n x (valueid, hotness)
3755 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3756 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3757 unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3759 // Abbrev for FS_PERMODULE or FS_PERMODULE_RELBF.
3760 Abbv = std::make_shared<BitCodeAbbrev>();
3761 if (WriteRelBFToSummary)
3762 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_RELBF));
3764 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE));
3765 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3766 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3767 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3768 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
3769 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3770 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
3771 // numrefs x valueid, n x (valueid [, rel_block_freq])
3772 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3773 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3774 unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3776 // Abbrev for FS_PERMODULE_GLOBALVAR_INIT_REFS.
3777 Abbv = std::make_shared<BitCodeAbbrev>();
3778 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS));
3779 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3780 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3781 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); // valueids
3782 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3783 unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3785 // Abbrev for FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS.
3786 Abbv = std::make_shared<BitCodeAbbrev>();
3787 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS));
3788 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3789 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3790 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3791 // numrefs x valueid, n x (valueid , offset)
3792 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3793 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3794 unsigned FSModVTableRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3796 // Abbrev for FS_ALIAS.
3797 Abbv = std::make_shared<BitCodeAbbrev>();
3798 Abbv->Add(BitCodeAbbrevOp(bitc::FS_ALIAS));
3799 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3800 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3801 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3802 unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3804 // Abbrev for FS_TYPE_ID_METADATA
3805 Abbv = std::make_shared<BitCodeAbbrev>();
3806 Abbv->Add(BitCodeAbbrevOp(bitc::FS_TYPE_ID_METADATA));
3807 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // typeid strtab index
3808 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // typeid length
3809 // n x (valueid , offset)
3810 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3811 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3812 unsigned TypeIdCompatibleVtableAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3814 SmallVector<uint64_t, 64> NameVals;
3815 // Iterate over the list of functions instead of the Index to
3816 // ensure the ordering is stable.
3817 for (const Function &F : M) {
3818 // Summary emission does not support anonymous functions, they have to
3819 // renamed using the anonymous function renaming pass.
3821 report_fatal_error("Unexpected anonymous function when writing summary");
3823 ValueInfo VI = Index->getValueInfo(F.getGUID());
3824 if (!VI || VI.getSummaryList().empty()) {
3825 // Only declarations should not have a summary (a declaration might
3826 // however have a summary if the def was in module level asm).
3827 assert(F.isDeclaration());
3830 auto *Summary = VI.getSummaryList()[0].get();
3831 writePerModuleFunctionSummaryRecord(NameVals, Summary, VE.getValueID(&F),
3832 FSCallsAbbrev, FSCallsProfileAbbrev, F);
3835 // Capture references from GlobalVariable initializers, which are outside
3836 // of a function scope.
3837 for (const GlobalVariable &G : M.globals())
3838 writeModuleLevelReferences(G, NameVals, FSModRefsAbbrev,
3839 FSModVTableRefsAbbrev);
3841 for (const GlobalAlias &A : M.aliases()) {
3842 auto *Aliasee = A.getBaseObject();
3843 if (!Aliasee->hasName())
3844 // Nameless function don't have an entry in the summary, skip it.
3846 auto AliasId = VE.getValueID(&A);
3847 auto AliaseeId = VE.getValueID(Aliasee);
3848 NameVals.push_back(AliasId);
3849 auto *Summary = Index->getGlobalValueSummary(A);
3850 AliasSummary *AS = cast<AliasSummary>(Summary);
3851 NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
3852 NameVals.push_back(AliaseeId);
3853 Stream.EmitRecord(bitc::FS_ALIAS, NameVals, FSAliasAbbrev);
3857 if (!Index->typeIdCompatibleVtableMap().empty()) {
3858 for (auto &S : Index->typeIdCompatibleVtableMap()) {
3859 writeTypeIdCompatibleVtableSummaryRecord(NameVals, StrtabBuilder, S.first,
3861 Stream.EmitRecord(bitc::FS_TYPE_ID_METADATA, NameVals,
3862 TypeIdCompatibleVtableAbbrev);
3870 /// Emit the combined summary section into the combined index file.
3871 void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
3872 Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
3873 Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
3875 // Write the index flags.
3877 if (Index.withGlobalValueDeadStripping())
3879 if (Index.skipModuleByDistributedBackend())
3881 if (Index.hasSyntheticEntryCounts())
3883 if (Index.enableSplitLTOUnit())
3885 if (Index.partiallySplitLTOUnits())
3887 Stream.EmitRecord(bitc::FS_FLAGS, ArrayRef<uint64_t>{Flags});
3889 for (const auto &GVI : valueIds()) {
3890 Stream.EmitRecord(bitc::FS_VALUE_GUID,
3891 ArrayRef<uint64_t>{GVI.second, GVI.first});
3894 // Abbrev for FS_COMBINED.
3895 auto Abbv = std::make_shared<BitCodeAbbrev>();
3896 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED));
3897 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3898 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3899 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3900 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3901 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
3902 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // entrycount
3903 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3904 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
3905 // numrefs x valueid, n x (valueid)
3906 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3907 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3908 unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3910 // Abbrev for FS_COMBINED_PROFILE.
3911 Abbv = std::make_shared<BitCodeAbbrev>();
3912 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_PROFILE));
3913 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3914 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3915 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3916 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3917 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // fflags
3918 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // entrycount
3919 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3920 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // immutablerefcnt
3921 // numrefs x valueid, n x (valueid, hotness)
3922 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3923 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3924 unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3926 // Abbrev for FS_COMBINED_GLOBALVAR_INIT_REFS.
3927 Abbv = std::make_shared<BitCodeAbbrev>();
3928 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS));
3929 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3930 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3931 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3932 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); // valueids
3933 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3934 unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3936 // Abbrev for FS_COMBINED_ALIAS.
3937 Abbv = std::make_shared<BitCodeAbbrev>();
3938 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_ALIAS));
3939 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3940 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3941 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3942 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3943 unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3945 // The aliases are emitted as a post-pass, and will point to the value
3946 // id of the aliasee. Save them in a vector for post-processing.
3947 SmallVector<AliasSummary *, 64> Aliases;
3949 // Save the value id for each summary for alias emission.
3950 DenseMap<const GlobalValueSummary *, unsigned> SummaryToValueIdMap;
3952 SmallVector<uint64_t, 64> NameVals;
3954 // Set that will be populated during call to writeFunctionTypeMetadataRecords
3955 // with the type ids referenced by this index file.
3956 std::set<GlobalValue::GUID> ReferencedTypeIds;
3958 // For local linkage, we also emit the original name separately
3959 // immediately after the record.
3960 auto MaybeEmitOriginalName = [&](GlobalValueSummary &S) {
3961 if (!GlobalValue::isLocalLinkage(S.linkage()))
3963 NameVals.push_back(S.getOriginalName());
3964 Stream.EmitRecord(bitc::FS_COMBINED_ORIGINAL_NAME, NameVals);
3968 forEachSummary([&](GVInfo I, bool IsAliasee) {
3969 GlobalValueSummary *S = I.second;
3972 auto ValueId = getValueId(I.first);
3974 SummaryToValueIdMap[S] = *ValueId;
3976 // If this is invoked for an aliasee, we want to record the above
3977 // mapping, but then not emit a summary entry (if the aliasee is
3978 // to be imported, we will invoke this separately with IsAliasee=false).
3982 if (auto *AS = dyn_cast<AliasSummary>(S)) {
3983 // Will process aliases as a post-pass because the reader wants all
3984 // global to be loaded first.
3985 Aliases.push_back(AS);
3989 if (auto *VS = dyn_cast<GlobalVarSummary>(S)) {
3990 NameVals.push_back(*ValueId);
3991 NameVals.push_back(Index.getModuleId(VS->modulePath()));
3992 NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
3993 NameVals.push_back(getEncodedGVarFlags(VS->varflags()));
3994 for (auto &RI : VS->refs()) {
3995 auto RefValueId = getValueId(RI.getGUID());
3998 NameVals.push_back(*RefValueId);
4001 // Emit the finished record.
4002 Stream.EmitRecord(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS, NameVals,
4005 MaybeEmitOriginalName(*S);
4009 auto *FS = cast<FunctionSummary>(S);
4010 writeFunctionTypeMetadataRecords(Stream, FS);
4011 getReferencedTypeIds(FS, ReferencedTypeIds);
4013 NameVals.push_back(*ValueId);
4014 NameVals.push_back(Index.getModuleId(FS->modulePath()));
4015 NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
4016 NameVals.push_back(FS->instCount());
4017 NameVals.push_back(getEncodedFFlags(FS->fflags()));
4018 NameVals.push_back(FS->entryCount());
4021 NameVals.push_back(0); // numrefs
4022 NameVals.push_back(0); // immutablerefcnt
4024 unsigned Count = 0, ImmutableRefCnt = 0;
4025 for (auto &RI : FS->refs()) {
4026 auto RefValueId = getValueId(RI.getGUID());
4029 NameVals.push_back(*RefValueId);
4030 if (RI.isReadOnly())
4034 NameVals[6] = Count;
4035 NameVals[7] = ImmutableRefCnt;
4037 bool HasProfileData = false;
4038 for (auto &EI : FS->calls()) {
4040 EI.second.getHotness() != CalleeInfo::HotnessType::Unknown;
4045 for (auto &EI : FS->calls()) {
4046 // If this GUID doesn't have a value id, it doesn't have a function
4047 // summary and we don't need to record any calls to it.
4048 GlobalValue::GUID GUID = EI.first.getGUID();
4049 auto CallValueId = getValueId(GUID);
4051 // For SamplePGO, the indirect call targets for local functions will
4052 // have its original name annotated in profile. We try to find the
4053 // corresponding PGOFuncName as the GUID.
4054 GUID = Index.getGUIDFromOriginalID(GUID);
4057 CallValueId = getValueId(GUID);
4060 // The mapping from OriginalId to GUID may return a GUID
4061 // that corresponds to a static variable. Filter it out here.
4062 // This can happen when
4063 // 1) There is a call to a library function which does not have
4065 // 2) There is a static variable with the OriginalGUID identical
4066 // to the GUID of the library function in 1);
4067 // When this happens, the logic for SamplePGO kicks in and
4068 // the static variable in 2) will be found, which needs to be
4070 auto *GVSum = Index.getGlobalValueSummary(GUID, false);
4072 GVSum->getSummaryKind() == GlobalValueSummary::GlobalVarKind)
4075 NameVals.push_back(*CallValueId);
4077 NameVals.push_back(static_cast<uint8_t>(EI.second.Hotness));
4080 unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
4082 (HasProfileData ? bitc::FS_COMBINED_PROFILE : bitc::FS_COMBINED);
4084 // Emit the finished record.
4085 Stream.EmitRecord(Code, NameVals, FSAbbrev);
4087 MaybeEmitOriginalName(*S);
4090 for (auto *AS : Aliases) {
4091 auto AliasValueId = SummaryToValueIdMap[AS];
4092 assert(AliasValueId);
4093 NameVals.push_back(AliasValueId);
4094 NameVals.push_back(Index.getModuleId(AS->modulePath()));
4095 NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
4096 auto AliaseeValueId = SummaryToValueIdMap[&AS->getAliasee()];
4097 assert(AliaseeValueId);
4098 NameVals.push_back(AliaseeValueId);
4100 // Emit the finished record.
4101 Stream.EmitRecord(bitc::FS_COMBINED_ALIAS, NameVals, FSAliasAbbrev);
4103 MaybeEmitOriginalName(*AS);
4105 if (auto *FS = dyn_cast<FunctionSummary>(&AS->getAliasee()))
4106 getReferencedTypeIds(FS, ReferencedTypeIds);
4109 if (!Index.cfiFunctionDefs().empty()) {
4110 for (auto &S : Index.cfiFunctionDefs()) {
4111 NameVals.push_back(StrtabBuilder.add(S));
4112 NameVals.push_back(S.size());
4114 Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DEFS, NameVals);
4118 if (!Index.cfiFunctionDecls().empty()) {
4119 for (auto &S : Index.cfiFunctionDecls()) {
4120 NameVals.push_back(StrtabBuilder.add(S));
4121 NameVals.push_back(S.size());
4123 Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DECLS, NameVals);
4127 // Walk the GUIDs that were referenced, and write the
4128 // corresponding type id records.
4129 for (auto &T : ReferencedTypeIds) {
4130 auto TidIter = Index.typeIds().equal_range(T);
4131 for (auto It = TidIter.first; It != TidIter.second; ++It) {
4132 writeTypeIdSummaryRecord(NameVals, StrtabBuilder, It->second.first,
4134 Stream.EmitRecord(bitc::FS_TYPE_ID, NameVals);
4142 /// Create the "IDENTIFICATION_BLOCK_ID" containing a single string with the
4143 /// current llvm version, and a record for the epoch number.
4144 static void writeIdentificationBlock(BitstreamWriter &Stream) {
4145 Stream.EnterSubblock(bitc::IDENTIFICATION_BLOCK_ID, 5);
4147 // Write the "user readable" string identifying the bitcode producer
4148 auto Abbv = std::make_shared<BitCodeAbbrev>();
4149 Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_STRING));
4150 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
4151 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
4152 auto StringAbbrev = Stream.EmitAbbrev(std::move(Abbv));
4153 writeStringRecord(Stream, bitc::IDENTIFICATION_CODE_STRING,
4154 "LLVM" LLVM_VERSION_STRING, StringAbbrev);
4156 // Write the epoch version
4157 Abbv = std::make_shared<BitCodeAbbrev>();
4158 Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_EPOCH));
4159 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
4160 auto EpochAbbrev = Stream.EmitAbbrev(std::move(Abbv));
4161 SmallVector<unsigned, 1> Vals = {bitc::BITCODE_CURRENT_EPOCH};
4162 Stream.EmitRecord(bitc::IDENTIFICATION_CODE_EPOCH, Vals, EpochAbbrev);
4166 void ModuleBitcodeWriter::writeModuleHash(size_t BlockStartPos) {
4167 // Emit the module's hash.
4168 // MODULE_CODE_HASH: [5*i32]
4171 Hasher.update(ArrayRef<uint8_t>((const uint8_t *)&(Buffer)[BlockStartPos],
4172 Buffer.size() - BlockStartPos));
4173 StringRef Hash = Hasher.result();
4174 for (int Pos = 0; Pos < 20; Pos += 4) {
4175 Vals[Pos / 4] = support::endian::read32be(Hash.data() + Pos);
4178 // Emit the finished record.
4179 Stream.EmitRecord(bitc::MODULE_CODE_HASH, Vals);
4182 // Save the written hash value.
4183 llvm::copy(Vals, std::begin(*ModHash));
4187 void ModuleBitcodeWriter::write() {
4188 writeIdentificationBlock(Stream);
4190 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
4191 size_t BlockStartPos = Buffer.size();
4193 writeModuleVersion();
4195 // Emit blockinfo, which defines the standard abbreviations etc.
4198 // Emit information describing all of the types in the module.
4201 // Emit information about attribute groups.
4202 writeAttributeGroupTable();
4204 // Emit information about parameter attributes.
4205 writeAttributeTable();
4209 // Emit top-level description of module, including target triple, inline asm,
4210 // descriptors for global variables, and function prototype info.
4214 writeModuleConstants();
4216 // Emit metadata kind names.
4217 writeModuleMetadataKinds();
4220 writeModuleMetadata();
4222 // Emit module-level use-lists.
4223 if (VE.shouldPreserveUseListOrder())
4224 writeUseListBlock(nullptr);
4226 writeOperandBundleTags();
4227 writeSyncScopeNames();
4229 // Emit function bodies.
4230 DenseMap<const Function *, uint64_t> FunctionToBitcodeIndex;
4231 for (Module::const_iterator F = M.begin(), E = M.end(); F != E; ++F)
4232 if (!F->isDeclaration())
4233 writeFunction(*F, FunctionToBitcodeIndex);
4235 // Need to write after the above call to WriteFunction which populates
4236 // the summary information in the index.
4238 writePerModuleGlobalValueSummary();
4240 writeGlobalValueSymbolTable(FunctionToBitcodeIndex);
4242 writeModuleHash(BlockStartPos);
4247 static void writeInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
4248 uint32_t &Position) {
4249 support::endian::write32le(&Buffer[Position], Value);
4253 /// If generating a bc file on darwin, we have to emit a
4254 /// header and trailer to make it compatible with the system archiver. To do
4255 /// this we emit the following header, and then emit a trailer that pads the
4256 /// file out to be a multiple of 16 bytes.
4258 /// struct bc_header {
4259 /// uint32_t Magic; // 0x0B17C0DE
4260 /// uint32_t Version; // Version, currently always 0.
4261 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
4262 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
4263 /// uint32_t CPUType; // CPU specifier.
4264 /// ... potentially more later ...
4266 static void emitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
4268 unsigned CPUType = ~0U;
4270 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
4271 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
4272 // number from /usr/include/mach/machine.h. It is ok to reproduce the
4273 // specific constants here because they are implicitly part of the Darwin ABI.
4275 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
4276 DARWIN_CPU_TYPE_X86 = 7,
4277 DARWIN_CPU_TYPE_ARM = 12,
4278 DARWIN_CPU_TYPE_POWERPC = 18
4281 Triple::ArchType Arch = TT.getArch();
4282 if (Arch == Triple::x86_64)
4283 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
4284 else if (Arch == Triple::x86)
4285 CPUType = DARWIN_CPU_TYPE_X86;
4286 else if (Arch == Triple::ppc)
4287 CPUType = DARWIN_CPU_TYPE_POWERPC;
4288 else if (Arch == Triple::ppc64)
4289 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
4290 else if (Arch == Triple::arm || Arch == Triple::thumb)
4291 CPUType = DARWIN_CPU_TYPE_ARM;
4293 // Traditional Bitcode starts after header.
4294 assert(Buffer.size() >= BWH_HeaderSize &&
4295 "Expected header size to be reserved");
4296 unsigned BCOffset = BWH_HeaderSize;
4297 unsigned BCSize = Buffer.size() - BWH_HeaderSize;
4299 // Write the magic and version.
4300 unsigned Position = 0;
4301 writeInt32ToBuffer(0x0B17C0DE, Buffer, Position);
4302 writeInt32ToBuffer(0, Buffer, Position); // Version.
4303 writeInt32ToBuffer(BCOffset, Buffer, Position);
4304 writeInt32ToBuffer(BCSize, Buffer, Position);
4305 writeInt32ToBuffer(CPUType, Buffer, Position);
4307 // If the file is not a multiple of 16 bytes, insert dummy padding.
4308 while (Buffer.size() & 15)
4309 Buffer.push_back(0);
4312 /// Helper to write the header common to all bitcode files.
4313 static void writeBitcodeHeader(BitstreamWriter &Stream) {
4314 // Emit the file header.
4315 Stream.Emit((unsigned)'B', 8);
4316 Stream.Emit((unsigned)'C', 8);
4317 Stream.Emit(0x0, 4);
4318 Stream.Emit(0xC, 4);
4319 Stream.Emit(0xE, 4);
4320 Stream.Emit(0xD, 4);
4323 BitcodeWriter::BitcodeWriter(SmallVectorImpl<char> &Buffer)
4324 : Buffer(Buffer), Stream(new BitstreamWriter(Buffer)) {
4325 writeBitcodeHeader(*Stream);
4328 BitcodeWriter::~BitcodeWriter() { assert(WroteStrtab); }
4330 void BitcodeWriter::writeBlob(unsigned Block, unsigned Record, StringRef Blob) {
4331 Stream->EnterSubblock(Block, 3);
4333 auto Abbv = std::make_shared<BitCodeAbbrev>();
4334 Abbv->Add(BitCodeAbbrevOp(Record));
4335 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
4336 auto AbbrevNo = Stream->EmitAbbrev(std::move(Abbv));
4338 Stream->EmitRecordWithBlob(AbbrevNo, ArrayRef<uint64_t>{Record}, Blob);
4340 Stream->ExitBlock();
4343 void BitcodeWriter::writeSymtab() {
4344 assert(!WroteStrtab && !WroteSymtab);
4346 // If any module has module-level inline asm, we will require a registered asm
4347 // parser for the target so that we can create an accurate symbol table for
4349 for (Module *M : Mods) {
4350 if (M->getModuleInlineAsm().empty())
4354 const Triple TT(M->getTargetTriple());
4355 const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
4356 if (!T || !T->hasMCAsmParser())
4361 SmallVector<char, 0> Symtab;
4362 // The irsymtab::build function may be unable to create a symbol table if the
4363 // module is malformed (e.g. it contains an invalid alias). Writing a symbol
4364 // table is not required for correctness, but we still want to be able to
4365 // write malformed modules to bitcode files, so swallow the error.
4366 if (Error E = irsymtab::build(Mods, Symtab, StrtabBuilder, Alloc)) {
4367 consumeError(std::move(E));
4371 writeBlob(bitc::SYMTAB_BLOCK_ID, bitc::SYMTAB_BLOB,
4372 {Symtab.data(), Symtab.size()});
4375 void BitcodeWriter::writeStrtab() {
4376 assert(!WroteStrtab);
4378 std::vector<char> Strtab;
4379 StrtabBuilder.finalizeInOrder();
4380 Strtab.resize(StrtabBuilder.getSize());
4381 StrtabBuilder.write((uint8_t *)Strtab.data());
4383 writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB,
4384 {Strtab.data(), Strtab.size()});
4389 void BitcodeWriter::copyStrtab(StringRef Strtab) {
4390 writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB, Strtab);
4394 void BitcodeWriter::writeModule(const Module &M,
4395 bool ShouldPreserveUseListOrder,
4396 const ModuleSummaryIndex *Index,
4397 bool GenerateHash, ModuleHash *ModHash) {
4398 assert(!WroteStrtab);
4400 // The Mods vector is used by irsymtab::build, which requires non-const
4401 // Modules in case it needs to materialize metadata. But the bitcode writer
4402 // requires that the module is materialized, so we can cast to non-const here,
4403 // after checking that it is in fact materialized.
4404 assert(M.isMaterialized());
4405 Mods.push_back(const_cast<Module *>(&M));
4407 ModuleBitcodeWriter ModuleWriter(M, Buffer, StrtabBuilder, *Stream,
4408 ShouldPreserveUseListOrder, Index,
4409 GenerateHash, ModHash);
4410 ModuleWriter.write();
4413 void BitcodeWriter::writeIndex(
4414 const ModuleSummaryIndex *Index,
4415 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) {
4416 IndexBitcodeWriter IndexWriter(*Stream, StrtabBuilder, *Index,
4417 ModuleToSummariesForIndex);
4418 IndexWriter.write();
4421 /// Write the specified module to the specified output stream.
4422 void llvm::WriteBitcodeToFile(const Module &M, raw_ostream &Out,
4423 bool ShouldPreserveUseListOrder,
4424 const ModuleSummaryIndex *Index,
4425 bool GenerateHash, ModuleHash *ModHash) {
4426 SmallVector<char, 0> Buffer;
4427 Buffer.reserve(256*1024);
4429 // If this is darwin or another generic macho target, reserve space for the
4431 Triple TT(M.getTargetTriple());
4432 if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
4433 Buffer.insert(Buffer.begin(), BWH_HeaderSize, 0);
4435 BitcodeWriter Writer(Buffer);
4436 Writer.writeModule(M, ShouldPreserveUseListOrder, Index, GenerateHash,
4438 Writer.writeSymtab();
4439 Writer.writeStrtab();
4441 if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
4442 emitDarwinBCHeaderAndTrailer(Buffer, TT);
4444 // Write the generated bitstream to "Out".
4445 Out.write((char*)&Buffer.front(), Buffer.size());
4448 void IndexBitcodeWriter::write() {
4449 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
4451 writeModuleVersion();
4453 // Write the module paths in the combined index.
4456 // Write the summary combined index records.
4457 writeCombinedGlobalValueSummary();
4462 // Write the specified module summary index to the given raw output stream,
4463 // where it will be written in a new bitcode block. This is used when
4464 // writing the combined index file for ThinLTO. When writing a subset of the
4465 // index for a distributed backend, provide a \p ModuleToSummariesForIndex map.
4466 void llvm::WriteIndexToFile(
4467 const ModuleSummaryIndex &Index, raw_ostream &Out,
4468 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) {
4469 SmallVector<char, 0> Buffer;
4470 Buffer.reserve(256 * 1024);
4472 BitcodeWriter Writer(Buffer);
4473 Writer.writeIndex(&Index, ModuleToSummariesForIndex);
4474 Writer.writeStrtab();
4476 Out.write((char *)&Buffer.front(), Buffer.size());
4481 /// Class to manage the bitcode writing for a thin link bitcode file.
4482 class ThinLinkBitcodeWriter : public ModuleBitcodeWriterBase {
4483 /// ModHash is for use in ThinLTO incremental build, generated while writing
4484 /// the module bitcode file.
4485 const ModuleHash *ModHash;
4488 ThinLinkBitcodeWriter(const Module &M, StringTableBuilder &StrtabBuilder,
4489 BitstreamWriter &Stream,
4490 const ModuleSummaryIndex &Index,
4491 const ModuleHash &ModHash)
4492 : ModuleBitcodeWriterBase(M, StrtabBuilder, Stream,
4493 /*ShouldPreserveUseListOrder=*/false, &Index),
4494 ModHash(&ModHash) {}
4499 void writeSimplifiedModuleInfo();
4502 } // end anonymous namespace
4504 // This function writes a simpilified module info for thin link bitcode file.
4505 // It only contains the source file name along with the name(the offset and
4506 // size in strtab) and linkage for global values. For the global value info
4507 // entry, in order to keep linkage at offset 5, there are three zeros used
4509 void ThinLinkBitcodeWriter::writeSimplifiedModuleInfo() {
4510 SmallVector<unsigned, 64> Vals;
4511 // Emit the module's source file name.
4513 StringEncoding Bits = getStringEncoding(M.getSourceFileName());
4514 BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8);
4515 if (Bits == SE_Char6)
4516 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6);
4517 else if (Bits == SE_Fixed7)
4518 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7);
4520 // MODULE_CODE_SOURCE_FILENAME: [namechar x N]
4521 auto Abbv = std::make_shared<BitCodeAbbrev>();
4522 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME));
4523 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
4524 Abbv->Add(AbbrevOpToUse);
4525 unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
4527 for (const auto P : M.getSourceFileName())
4528 Vals.push_back((unsigned char)P);
4530 Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev);
4534 // Emit the global variable information.
4535 for (const GlobalVariable &GV : M.globals()) {
4536 // GLOBALVAR: [strtab offset, strtab size, 0, 0, 0, linkage]
4537 Vals.push_back(StrtabBuilder.add(GV.getName()));
4538 Vals.push_back(GV.getName().size());
4542 Vals.push_back(getEncodedLinkage(GV));
4544 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals);
4548 // Emit the function proto information.
4549 for (const Function &F : M) {
4550 // FUNCTION: [strtab offset, strtab size, 0, 0, 0, linkage]
4551 Vals.push_back(StrtabBuilder.add(F.getName()));
4552 Vals.push_back(F.getName().size());
4556 Vals.push_back(getEncodedLinkage(F));
4558 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals);
4562 // Emit the alias information.
4563 for (const GlobalAlias &A : M.aliases()) {
4564 // ALIAS: [strtab offset, strtab size, 0, 0, 0, linkage]
4565 Vals.push_back(StrtabBuilder.add(A.getName()));
4566 Vals.push_back(A.getName().size());
4570 Vals.push_back(getEncodedLinkage(A));
4572 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals);
4576 // Emit the ifunc information.
4577 for (const GlobalIFunc &I : M.ifuncs()) {
4578 // IFUNC: [strtab offset, strtab size, 0, 0, 0, linkage]
4579 Vals.push_back(StrtabBuilder.add(I.getName()));
4580 Vals.push_back(I.getName().size());
4584 Vals.push_back(getEncodedLinkage(I));
4586 Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
4591 void ThinLinkBitcodeWriter::write() {
4592 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
4594 writeModuleVersion();
4596 writeSimplifiedModuleInfo();
4598 writePerModuleGlobalValueSummary();
4600 // Write module hash.
4601 Stream.EmitRecord(bitc::MODULE_CODE_HASH, ArrayRef<uint32_t>(*ModHash));
4606 void BitcodeWriter::writeThinLinkBitcode(const Module &M,
4607 const ModuleSummaryIndex &Index,
4608 const ModuleHash &ModHash) {
4609 assert(!WroteStrtab);
4611 // The Mods vector is used by irsymtab::build, which requires non-const
4612 // Modules in case it needs to materialize metadata. But the bitcode writer
4613 // requires that the module is materialized, so we can cast to non-const here,
4614 // after checking that it is in fact materialized.
4615 assert(M.isMaterialized());
4616 Mods.push_back(const_cast<Module *>(&M));
4618 ThinLinkBitcodeWriter ThinLinkWriter(M, StrtabBuilder, *Stream, Index,
4620 ThinLinkWriter.write();
4623 // Write the specified thin link bitcode file to the given raw output stream,
4624 // where it will be written in a new bitcode block. This is used when
4625 // writing the per-module index file for ThinLTO.
4626 void llvm::WriteThinLinkBitcodeToFile(const Module &M, raw_ostream &Out,
4627 const ModuleSummaryIndex &Index,
4628 const ModuleHash &ModHash) {
4629 SmallVector<char, 0> Buffer;
4630 Buffer.reserve(256 * 1024);
4632 BitcodeWriter Writer(Buffer);
4633 Writer.writeThinLinkBitcode(M, Index, ModHash);
4634 Writer.writeSymtab();
4635 Writer.writeStrtab();
4637 Out.write((char *)&Buffer.front(), Buffer.size());