1 //===--- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Bitcode writer implementation.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Bitcode/BitcodeWriter.h"
15 #include "ValueEnumerator.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Bitcode/BitstreamWriter.h"
19 #include "llvm/Bitcode/LLVMBitCodes.h"
20 #include "llvm/IR/CallSite.h"
21 #include "llvm/IR/Constants.h"
22 #include "llvm/IR/DebugInfoMetadata.h"
23 #include "llvm/IR/DerivedTypes.h"
24 #include "llvm/IR/InlineAsm.h"
25 #include "llvm/IR/Instructions.h"
26 #include "llvm/IR/LLVMContext.h"
27 #include "llvm/IR/Module.h"
28 #include "llvm/IR/Operator.h"
29 #include "llvm/IR/UseListOrder.h"
30 #include "llvm/IR/ValueSymbolTable.h"
31 #include "llvm/MC/StringTableBuilder.h"
32 #include "llvm/Object/IRSymtab.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/MathExtras.h"
35 #include "llvm/Support/Program.h"
36 #include "llvm/Support/SHA1.h"
37 #include "llvm/Support/TargetRegistry.h"
38 #include "llvm/Support/raw_ostream.h"
46 IndexThreshold("bitcode-mdindex-threshold", cl::Hidden, cl::init(25),
47 cl::desc("Number of metadatas above which we emit an index "
48 "to enable lazy-loading"));
49 /// These are manifest constants used by the bitcode writer. They do not need to
50 /// be kept in sync with the reader, but need to be consistent within this file.
52 // VALUE_SYMTAB_BLOCK abbrev id's.
53 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
58 // CONSTANTS_BLOCK abbrev id's.
59 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
60 CONSTANTS_INTEGER_ABBREV,
61 CONSTANTS_CE_CAST_Abbrev,
62 CONSTANTS_NULL_Abbrev,
64 // FUNCTION_BLOCK abbrev id's.
65 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
66 FUNCTION_INST_BINOP_ABBREV,
67 FUNCTION_INST_BINOP_FLAGS_ABBREV,
68 FUNCTION_INST_CAST_ABBREV,
69 FUNCTION_INST_RET_VOID_ABBREV,
70 FUNCTION_INST_RET_VAL_ABBREV,
71 FUNCTION_INST_UNREACHABLE_ABBREV,
72 FUNCTION_INST_GEP_ABBREV,
75 /// Abstract class to manage the bitcode writing, subclassed for each bitcode
77 class BitcodeWriterBase {
79 /// The stream created and owned by the client.
80 BitstreamWriter &Stream;
82 StringTableBuilder &StrtabBuilder;
85 /// Constructs a BitcodeWriterBase object that writes to the provided
87 BitcodeWriterBase(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder)
88 : Stream(Stream), StrtabBuilder(StrtabBuilder) {}
91 void writeBitcodeHeader();
92 void writeModuleVersion();
95 void BitcodeWriterBase::writeModuleVersion() {
96 // VERSION: [version#]
97 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, ArrayRef<uint64_t>{2});
100 /// Class to manage the bitcode writing for a module.
101 class ModuleBitcodeWriter : public BitcodeWriterBase {
102 /// Pointer to the buffer allocated by caller for bitcode writing.
103 const SmallVectorImpl<char> &Buffer;
105 /// The Module to write to bitcode.
108 /// Enumerates ids for all values in the module.
111 /// Optional per-module index to write for ThinLTO.
112 const ModuleSummaryIndex *Index;
114 /// True if a module hash record should be written.
119 /// If non-null, when GenerateHash is true, the resulting hash is written
120 /// into ModHash. When GenerateHash is false, that specified value
121 /// is used as the hash instead of computing from the generated bitcode.
122 /// Can be used to produce the same module hash for a minimized bitcode
123 /// used just for the thin link as in the regular full bitcode that will
124 /// be used in the backend.
127 /// The start bit of the identification block.
128 uint64_t BitcodeStartBit;
130 /// Map that holds the correspondence between GUIDs in the summary index,
131 /// that came from indirect call profiles, and a value id generated by this
132 /// class to use in the VST and summary block records.
133 std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
135 /// Tracks the last value id recorded in the GUIDToValueMap.
136 unsigned GlobalValueId;
138 /// Saves the offset of the VSTOffset record that must eventually be
139 /// backpatched with the offset of the actual VST.
140 uint64_t VSTOffsetPlaceholder = 0;
143 /// Constructs a ModuleBitcodeWriter object for the given Module,
144 /// writing to the provided \p Buffer.
145 ModuleBitcodeWriter(const Module *M, SmallVectorImpl<char> &Buffer,
146 StringTableBuilder &StrtabBuilder,
147 BitstreamWriter &Stream, bool ShouldPreserveUseListOrder,
148 const ModuleSummaryIndex *Index, bool GenerateHash,
149 ModuleHash *ModHash = nullptr)
150 : BitcodeWriterBase(Stream, StrtabBuilder), Buffer(Buffer), M(*M),
151 VE(*M, ShouldPreserveUseListOrder), Index(Index),
152 GenerateHash(GenerateHash), ModHash(ModHash),
153 BitcodeStartBit(Stream.GetCurrentBitNo()) {
154 // Assign ValueIds to any callee values in the index that came from
155 // indirect call profiles and were recorded as a GUID not a Value*
156 // (which would have been assigned an ID by the ValueEnumerator).
157 // The starting ValueId is just after the number of values in the
158 // ValueEnumerator, so that they can be emitted in the VST.
159 GlobalValueId = VE.getValues().size();
162 for (const auto &GUIDSummaryLists : *Index)
163 // Examine all summaries for this GUID.
164 for (auto &Summary : GUIDSummaryLists.second.SummaryList)
165 if (auto FS = dyn_cast<FunctionSummary>(Summary.get()))
166 // For each call in the function summary, see if the call
167 // is to a GUID (which means it is for an indirect call,
168 // otherwise we would have a Value for it). If so, synthesize
170 for (auto &CallEdge : FS->calls())
171 if (!CallEdge.first.getValue())
172 assignValueId(CallEdge.first.getGUID());
175 /// Emit the current module to the bitstream.
179 uint64_t bitcodeStartBit() { return BitcodeStartBit; }
181 size_t addToStrtab(StringRef Str);
183 void writeAttributeGroupTable();
184 void writeAttributeTable();
185 void writeTypeTable();
187 void writeValueSymbolTableForwardDecl();
188 void writeModuleInfo();
189 void writeValueAsMetadata(const ValueAsMetadata *MD,
190 SmallVectorImpl<uint64_t> &Record);
191 void writeMDTuple(const MDTuple *N, SmallVectorImpl<uint64_t> &Record,
193 unsigned createDILocationAbbrev();
194 void writeDILocation(const DILocation *N, SmallVectorImpl<uint64_t> &Record,
196 unsigned createGenericDINodeAbbrev();
197 void writeGenericDINode(const GenericDINode *N,
198 SmallVectorImpl<uint64_t> &Record, unsigned &Abbrev);
199 void writeDISubrange(const DISubrange *N, SmallVectorImpl<uint64_t> &Record,
201 void writeDIEnumerator(const DIEnumerator *N,
202 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
203 void writeDIBasicType(const DIBasicType *N, SmallVectorImpl<uint64_t> &Record,
205 void writeDIDerivedType(const DIDerivedType *N,
206 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
207 void writeDICompositeType(const DICompositeType *N,
208 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
209 void writeDISubroutineType(const DISubroutineType *N,
210 SmallVectorImpl<uint64_t> &Record,
212 void writeDIFile(const DIFile *N, SmallVectorImpl<uint64_t> &Record,
214 void writeDICompileUnit(const DICompileUnit *N,
215 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
216 void writeDISubprogram(const DISubprogram *N,
217 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
218 void writeDILexicalBlock(const DILexicalBlock *N,
219 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
220 void writeDILexicalBlockFile(const DILexicalBlockFile *N,
221 SmallVectorImpl<uint64_t> &Record,
223 void writeDINamespace(const DINamespace *N, SmallVectorImpl<uint64_t> &Record,
225 void writeDIMacro(const DIMacro *N, SmallVectorImpl<uint64_t> &Record,
227 void writeDIMacroFile(const DIMacroFile *N, SmallVectorImpl<uint64_t> &Record,
229 void writeDIModule(const DIModule *N, SmallVectorImpl<uint64_t> &Record,
231 void writeDITemplateTypeParameter(const DITemplateTypeParameter *N,
232 SmallVectorImpl<uint64_t> &Record,
234 void writeDITemplateValueParameter(const DITemplateValueParameter *N,
235 SmallVectorImpl<uint64_t> &Record,
237 void writeDIGlobalVariable(const DIGlobalVariable *N,
238 SmallVectorImpl<uint64_t> &Record,
240 void writeDILocalVariable(const DILocalVariable *N,
241 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
242 void writeDIExpression(const DIExpression *N,
243 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
244 void writeDIGlobalVariableExpression(const DIGlobalVariableExpression *N,
245 SmallVectorImpl<uint64_t> &Record,
247 void writeDIObjCProperty(const DIObjCProperty *N,
248 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
249 void writeDIImportedEntity(const DIImportedEntity *N,
250 SmallVectorImpl<uint64_t> &Record,
252 unsigned createNamedMetadataAbbrev();
253 void writeNamedMetadata(SmallVectorImpl<uint64_t> &Record);
254 unsigned createMetadataStringsAbbrev();
255 void writeMetadataStrings(ArrayRef<const Metadata *> Strings,
256 SmallVectorImpl<uint64_t> &Record);
257 void writeMetadataRecords(ArrayRef<const Metadata *> MDs,
258 SmallVectorImpl<uint64_t> &Record,
259 std::vector<unsigned> *MDAbbrevs = nullptr,
260 std::vector<uint64_t> *IndexPos = nullptr);
261 void writeModuleMetadata();
262 void writeFunctionMetadata(const Function &F);
263 void writeFunctionMetadataAttachment(const Function &F);
264 void writeGlobalVariableMetadataAttachment(const GlobalVariable &GV);
265 void pushGlobalMetadataAttachment(SmallVectorImpl<uint64_t> &Record,
266 const GlobalObject &GO);
267 void writeModuleMetadataKinds();
268 void writeOperandBundleTags();
269 void writeSyncScopeNames();
270 void writeConstants(unsigned FirstVal, unsigned LastVal, bool isGlobal);
271 void writeModuleConstants();
272 bool pushValueAndType(const Value *V, unsigned InstID,
273 SmallVectorImpl<unsigned> &Vals);
274 void writeOperandBundles(ImmutableCallSite CS, unsigned InstID);
275 void pushValue(const Value *V, unsigned InstID,
276 SmallVectorImpl<unsigned> &Vals);
277 void pushValueSigned(const Value *V, unsigned InstID,
278 SmallVectorImpl<uint64_t> &Vals);
279 void writeInstruction(const Instruction &I, unsigned InstID,
280 SmallVectorImpl<unsigned> &Vals);
281 void writeFunctionLevelValueSymbolTable(const ValueSymbolTable &VST);
282 void writeGlobalValueSymbolTable(
283 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
284 void writeUseList(UseListOrder &&Order);
285 void writeUseListBlock(const Function *F);
287 writeFunction(const Function &F,
288 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
289 void writeBlockInfo();
290 void writePerModuleFunctionSummaryRecord(SmallVector<uint64_t, 64> &NameVals,
291 GlobalValueSummary *Summary,
293 unsigned FSCallsAbbrev,
294 unsigned FSCallsProfileAbbrev,
296 void writeModuleLevelReferences(const GlobalVariable &V,
297 SmallVector<uint64_t, 64> &NameVals,
298 unsigned FSModRefsAbbrev);
299 void writePerModuleGlobalValueSummary();
300 void writeModuleHash(size_t BlockStartPos);
302 void assignValueId(GlobalValue::GUID ValGUID) {
303 GUIDToValueIdMap[ValGUID] = ++GlobalValueId;
305 unsigned getValueId(GlobalValue::GUID ValGUID) {
306 const auto &VMI = GUIDToValueIdMap.find(ValGUID);
307 // Expect that any GUID value had a value Id assigned by an
308 // earlier call to assignValueId.
309 assert(VMI != GUIDToValueIdMap.end() &&
310 "GUID does not have assigned value Id");
313 // Helper to get the valueId for the type of value recorded in VI.
314 unsigned getValueId(ValueInfo VI) {
316 return getValueId(VI.getGUID());
317 return VE.getValueID(VI.getValue());
319 std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
321 unsigned getEncodedSyncScopeID(SyncScope::ID SSID) {
322 return unsigned(SSID);
326 /// Class to manage the bitcode writing for a combined index.
327 class IndexBitcodeWriter : public BitcodeWriterBase {
328 /// The combined index to write to bitcode.
329 const ModuleSummaryIndex &Index;
331 /// When writing a subset of the index for distributed backends, client
332 /// provides a map of modules to the corresponding GUIDs/summaries to write.
333 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex;
335 /// Map that holds the correspondence between the GUID used in the combined
336 /// index and a value id generated by this class to use in references.
337 std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
339 /// Tracks the last value id recorded in the GUIDToValueMap.
340 unsigned GlobalValueId = 0;
343 /// Constructs a IndexBitcodeWriter object for the given combined index,
344 /// writing to the provided \p Buffer. When writing a subset of the index
345 /// for a distributed backend, provide a \p ModuleToSummariesForIndex map.
346 IndexBitcodeWriter(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder,
347 const ModuleSummaryIndex &Index,
348 const std::map<std::string, GVSummaryMapTy>
349 *ModuleToSummariesForIndex = nullptr)
350 : BitcodeWriterBase(Stream, StrtabBuilder), Index(Index),
351 ModuleToSummariesForIndex(ModuleToSummariesForIndex) {
352 // Assign unique value ids to all summaries to be written, for use
353 // in writing out the call graph edges. Save the mapping from GUID
354 // to the new global value id to use when writing those edges, which
355 // are currently saved in the index in terms of GUID.
356 forEachSummary([&](GVInfo I) {
357 GUIDToValueIdMap[I.first] = ++GlobalValueId;
361 /// The below iterator returns the GUID and associated summary.
362 typedef std::pair<GlobalValue::GUID, GlobalValueSummary *> GVInfo;
364 /// Calls the callback for each value GUID and summary to be written to
365 /// bitcode. This hides the details of whether they are being pulled from the
366 /// entire index or just those in a provided ModuleToSummariesForIndex map.
367 template<typename Functor>
368 void forEachSummary(Functor Callback) {
369 if (ModuleToSummariesForIndex) {
370 for (auto &M : *ModuleToSummariesForIndex)
371 for (auto &Summary : M.second)
374 for (auto &Summaries : Index)
375 for (auto &Summary : Summaries.second.SummaryList)
376 Callback({Summaries.first, Summary.get()});
380 /// Calls the callback for each entry in the modulePaths StringMap that
381 /// should be written to the module path string table. This hides the details
382 /// of whether they are being pulled from the entire index or just those in a
383 /// provided ModuleToSummariesForIndex map.
384 template <typename Functor> void forEachModule(Functor Callback) {
385 if (ModuleToSummariesForIndex) {
386 for (const auto &M : *ModuleToSummariesForIndex) {
387 const auto &MPI = Index.modulePaths().find(M.first);
388 if (MPI == Index.modulePaths().end()) {
389 // This should only happen if the bitcode file was empty, in which
390 // case we shouldn't be importing (the ModuleToSummariesForIndex
391 // would only include the module we are writing and index for).
392 assert(ModuleToSummariesForIndex->size() == 1);
398 for (const auto &MPSE : Index.modulePaths())
403 /// Main entry point for writing a combined index to bitcode.
407 void writeModStrings();
408 void writeCombinedGlobalValueSummary();
410 Optional<unsigned> getValueId(GlobalValue::GUID ValGUID) {
411 auto VMI = GUIDToValueIdMap.find(ValGUID);
412 if (VMI == GUIDToValueIdMap.end())
416 std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
418 } // end anonymous namespace
420 static unsigned getEncodedCastOpcode(unsigned Opcode) {
422 default: llvm_unreachable("Unknown cast instruction!");
423 case Instruction::Trunc : return bitc::CAST_TRUNC;
424 case Instruction::ZExt : return bitc::CAST_ZEXT;
425 case Instruction::SExt : return bitc::CAST_SEXT;
426 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
427 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
428 case Instruction::UIToFP : return bitc::CAST_UITOFP;
429 case Instruction::SIToFP : return bitc::CAST_SITOFP;
430 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
431 case Instruction::FPExt : return bitc::CAST_FPEXT;
432 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
433 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
434 case Instruction::BitCast : return bitc::CAST_BITCAST;
435 case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST;
439 static unsigned getEncodedBinaryOpcode(unsigned Opcode) {
441 default: llvm_unreachable("Unknown binary instruction!");
442 case Instruction::Add:
443 case Instruction::FAdd: return bitc::BINOP_ADD;
444 case Instruction::Sub:
445 case Instruction::FSub: return bitc::BINOP_SUB;
446 case Instruction::Mul:
447 case Instruction::FMul: return bitc::BINOP_MUL;
448 case Instruction::UDiv: return bitc::BINOP_UDIV;
449 case Instruction::FDiv:
450 case Instruction::SDiv: return bitc::BINOP_SDIV;
451 case Instruction::URem: return bitc::BINOP_UREM;
452 case Instruction::FRem:
453 case Instruction::SRem: return bitc::BINOP_SREM;
454 case Instruction::Shl: return bitc::BINOP_SHL;
455 case Instruction::LShr: return bitc::BINOP_LSHR;
456 case Instruction::AShr: return bitc::BINOP_ASHR;
457 case Instruction::And: return bitc::BINOP_AND;
458 case Instruction::Or: return bitc::BINOP_OR;
459 case Instruction::Xor: return bitc::BINOP_XOR;
463 static unsigned getEncodedRMWOperation(AtomicRMWInst::BinOp Op) {
465 default: llvm_unreachable("Unknown RMW operation!");
466 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG;
467 case AtomicRMWInst::Add: return bitc::RMW_ADD;
468 case AtomicRMWInst::Sub: return bitc::RMW_SUB;
469 case AtomicRMWInst::And: return bitc::RMW_AND;
470 case AtomicRMWInst::Nand: return bitc::RMW_NAND;
471 case AtomicRMWInst::Or: return bitc::RMW_OR;
472 case AtomicRMWInst::Xor: return bitc::RMW_XOR;
473 case AtomicRMWInst::Max: return bitc::RMW_MAX;
474 case AtomicRMWInst::Min: return bitc::RMW_MIN;
475 case AtomicRMWInst::UMax: return bitc::RMW_UMAX;
476 case AtomicRMWInst::UMin: return bitc::RMW_UMIN;
480 static unsigned getEncodedOrdering(AtomicOrdering Ordering) {
482 case AtomicOrdering::NotAtomic: return bitc::ORDERING_NOTATOMIC;
483 case AtomicOrdering::Unordered: return bitc::ORDERING_UNORDERED;
484 case AtomicOrdering::Monotonic: return bitc::ORDERING_MONOTONIC;
485 case AtomicOrdering::Acquire: return bitc::ORDERING_ACQUIRE;
486 case AtomicOrdering::Release: return bitc::ORDERING_RELEASE;
487 case AtomicOrdering::AcquireRelease: return bitc::ORDERING_ACQREL;
488 case AtomicOrdering::SequentiallyConsistent: return bitc::ORDERING_SEQCST;
490 llvm_unreachable("Invalid ordering");
493 static void writeStringRecord(BitstreamWriter &Stream, unsigned Code,
494 StringRef Str, unsigned AbbrevToUse) {
495 SmallVector<unsigned, 64> Vals;
497 // Code: [strchar x N]
498 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
499 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i]))
501 Vals.push_back(Str[i]);
504 // Emit the finished record.
505 Stream.EmitRecord(Code, Vals, AbbrevToUse);
508 static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
510 case Attribute::Alignment:
511 return bitc::ATTR_KIND_ALIGNMENT;
512 case Attribute::AllocSize:
513 return bitc::ATTR_KIND_ALLOC_SIZE;
514 case Attribute::AlwaysInline:
515 return bitc::ATTR_KIND_ALWAYS_INLINE;
516 case Attribute::ArgMemOnly:
517 return bitc::ATTR_KIND_ARGMEMONLY;
518 case Attribute::Builtin:
519 return bitc::ATTR_KIND_BUILTIN;
520 case Attribute::ByVal:
521 return bitc::ATTR_KIND_BY_VAL;
522 case Attribute::Convergent:
523 return bitc::ATTR_KIND_CONVERGENT;
524 case Attribute::InAlloca:
525 return bitc::ATTR_KIND_IN_ALLOCA;
526 case Attribute::Cold:
527 return bitc::ATTR_KIND_COLD;
528 case Attribute::InaccessibleMemOnly:
529 return bitc::ATTR_KIND_INACCESSIBLEMEM_ONLY;
530 case Attribute::InaccessibleMemOrArgMemOnly:
531 return bitc::ATTR_KIND_INACCESSIBLEMEM_OR_ARGMEMONLY;
532 case Attribute::InlineHint:
533 return bitc::ATTR_KIND_INLINE_HINT;
534 case Attribute::InReg:
535 return bitc::ATTR_KIND_IN_REG;
536 case Attribute::JumpTable:
537 return bitc::ATTR_KIND_JUMP_TABLE;
538 case Attribute::MinSize:
539 return bitc::ATTR_KIND_MIN_SIZE;
540 case Attribute::Naked:
541 return bitc::ATTR_KIND_NAKED;
542 case Attribute::Nest:
543 return bitc::ATTR_KIND_NEST;
544 case Attribute::NoAlias:
545 return bitc::ATTR_KIND_NO_ALIAS;
546 case Attribute::NoBuiltin:
547 return bitc::ATTR_KIND_NO_BUILTIN;
548 case Attribute::NoCapture:
549 return bitc::ATTR_KIND_NO_CAPTURE;
550 case Attribute::NoDuplicate:
551 return bitc::ATTR_KIND_NO_DUPLICATE;
552 case Attribute::NoImplicitFloat:
553 return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT;
554 case Attribute::NoInline:
555 return bitc::ATTR_KIND_NO_INLINE;
556 case Attribute::NoRecurse:
557 return bitc::ATTR_KIND_NO_RECURSE;
558 case Attribute::NonLazyBind:
559 return bitc::ATTR_KIND_NON_LAZY_BIND;
560 case Attribute::NonNull:
561 return bitc::ATTR_KIND_NON_NULL;
562 case Attribute::Dereferenceable:
563 return bitc::ATTR_KIND_DEREFERENCEABLE;
564 case Attribute::DereferenceableOrNull:
565 return bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL;
566 case Attribute::NoRedZone:
567 return bitc::ATTR_KIND_NO_RED_ZONE;
568 case Attribute::NoReturn:
569 return bitc::ATTR_KIND_NO_RETURN;
570 case Attribute::NoUnwind:
571 return bitc::ATTR_KIND_NO_UNWIND;
572 case Attribute::OptimizeForSize:
573 return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE;
574 case Attribute::OptimizeNone:
575 return bitc::ATTR_KIND_OPTIMIZE_NONE;
576 case Attribute::ReadNone:
577 return bitc::ATTR_KIND_READ_NONE;
578 case Attribute::ReadOnly:
579 return bitc::ATTR_KIND_READ_ONLY;
580 case Attribute::Returned:
581 return bitc::ATTR_KIND_RETURNED;
582 case Attribute::ReturnsTwice:
583 return bitc::ATTR_KIND_RETURNS_TWICE;
584 case Attribute::SExt:
585 return bitc::ATTR_KIND_S_EXT;
586 case Attribute::Speculatable:
587 return bitc::ATTR_KIND_SPECULATABLE;
588 case Attribute::StackAlignment:
589 return bitc::ATTR_KIND_STACK_ALIGNMENT;
590 case Attribute::StackProtect:
591 return bitc::ATTR_KIND_STACK_PROTECT;
592 case Attribute::StackProtectReq:
593 return bitc::ATTR_KIND_STACK_PROTECT_REQ;
594 case Attribute::StackProtectStrong:
595 return bitc::ATTR_KIND_STACK_PROTECT_STRONG;
596 case Attribute::SafeStack:
597 return bitc::ATTR_KIND_SAFESTACK;
598 case Attribute::StructRet:
599 return bitc::ATTR_KIND_STRUCT_RET;
600 case Attribute::SanitizeAddress:
601 return bitc::ATTR_KIND_SANITIZE_ADDRESS;
602 case Attribute::SanitizeThread:
603 return bitc::ATTR_KIND_SANITIZE_THREAD;
604 case Attribute::SanitizeMemory:
605 return bitc::ATTR_KIND_SANITIZE_MEMORY;
606 case Attribute::SwiftError:
607 return bitc::ATTR_KIND_SWIFT_ERROR;
608 case Attribute::SwiftSelf:
609 return bitc::ATTR_KIND_SWIFT_SELF;
610 case Attribute::UWTable:
611 return bitc::ATTR_KIND_UW_TABLE;
612 case Attribute::WriteOnly:
613 return bitc::ATTR_KIND_WRITEONLY;
614 case Attribute::ZExt:
615 return bitc::ATTR_KIND_Z_EXT;
616 case Attribute::EndAttrKinds:
617 llvm_unreachable("Can not encode end-attribute kinds marker.");
618 case Attribute::None:
619 llvm_unreachable("Can not encode none-attribute.");
622 llvm_unreachable("Trying to encode unknown attribute");
625 void ModuleBitcodeWriter::writeAttributeGroupTable() {
626 const std::vector<ValueEnumerator::IndexAndAttrSet> &AttrGrps =
627 VE.getAttributeGroups();
628 if (AttrGrps.empty()) return;
630 Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
632 SmallVector<uint64_t, 64> Record;
633 for (ValueEnumerator::IndexAndAttrSet Pair : AttrGrps) {
634 unsigned AttrListIndex = Pair.first;
635 AttributeSet AS = Pair.second;
636 Record.push_back(VE.getAttributeGroupID(Pair));
637 Record.push_back(AttrListIndex);
639 for (Attribute Attr : AS) {
640 if (Attr.isEnumAttribute()) {
642 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
643 } else if (Attr.isIntAttribute()) {
645 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
646 Record.push_back(Attr.getValueAsInt());
648 StringRef Kind = Attr.getKindAsString();
649 StringRef Val = Attr.getValueAsString();
651 Record.push_back(Val.empty() ? 3 : 4);
652 Record.append(Kind.begin(), Kind.end());
655 Record.append(Val.begin(), Val.end());
661 Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
668 void ModuleBitcodeWriter::writeAttributeTable() {
669 const std::vector<AttributeList> &Attrs = VE.getAttributeLists();
670 if (Attrs.empty()) return;
672 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
674 SmallVector<uint64_t, 64> Record;
675 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
676 AttributeList AL = Attrs[i];
677 for (unsigned i = AL.index_begin(), e = AL.index_end(); i != e; ++i) {
678 AttributeSet AS = AL.getAttributes(i);
679 if (AS.hasAttributes())
680 Record.push_back(VE.getAttributeGroupID({i, AS}));
683 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
690 /// WriteTypeTable - Write out the type table for a module.
691 void ModuleBitcodeWriter::writeTypeTable() {
692 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
694 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
695 SmallVector<uint64_t, 64> TypeVals;
697 uint64_t NumBits = VE.computeBitsRequiredForTypeIndicies();
699 // Abbrev for TYPE_CODE_POINTER.
700 auto Abbv = std::make_shared<BitCodeAbbrev>();
701 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
702 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
703 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
704 unsigned PtrAbbrev = Stream.EmitAbbrev(std::move(Abbv));
706 // Abbrev for TYPE_CODE_FUNCTION.
707 Abbv = std::make_shared<BitCodeAbbrev>();
708 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
709 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
710 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
711 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
713 unsigned FunctionAbbrev = Stream.EmitAbbrev(std::move(Abbv));
715 // Abbrev for TYPE_CODE_STRUCT_ANON.
716 Abbv = std::make_shared<BitCodeAbbrev>();
717 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON));
718 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
719 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
720 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
722 unsigned StructAnonAbbrev = Stream.EmitAbbrev(std::move(Abbv));
724 // Abbrev for TYPE_CODE_STRUCT_NAME.
725 Abbv = std::make_shared<BitCodeAbbrev>();
726 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
727 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
728 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
729 unsigned StructNameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
731 // Abbrev for TYPE_CODE_STRUCT_NAMED.
732 Abbv = std::make_shared<BitCodeAbbrev>();
733 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED));
734 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
735 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
736 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
738 unsigned StructNamedAbbrev = Stream.EmitAbbrev(std::move(Abbv));
740 // Abbrev for TYPE_CODE_ARRAY.
741 Abbv = std::make_shared<BitCodeAbbrev>();
742 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
743 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
744 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
746 unsigned ArrayAbbrev = Stream.EmitAbbrev(std::move(Abbv));
748 // Emit an entry count so the reader can reserve space.
749 TypeVals.push_back(TypeList.size());
750 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
753 // Loop over all of the types, emitting each in turn.
754 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
755 Type *T = TypeList[i];
759 switch (T->getTypeID()) {
760 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
761 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break;
762 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
763 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
764 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
765 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
766 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
767 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
768 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
769 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break;
770 case Type::TokenTyID: Code = bitc::TYPE_CODE_TOKEN; break;
771 case Type::IntegerTyID:
773 Code = bitc::TYPE_CODE_INTEGER;
774 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
776 case Type::PointerTyID: {
777 PointerType *PTy = cast<PointerType>(T);
778 // POINTER: [pointee type, address space]
779 Code = bitc::TYPE_CODE_POINTER;
780 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
781 unsigned AddressSpace = PTy->getAddressSpace();
782 TypeVals.push_back(AddressSpace);
783 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
786 case Type::FunctionTyID: {
787 FunctionType *FT = cast<FunctionType>(T);
788 // FUNCTION: [isvararg, retty, paramty x N]
789 Code = bitc::TYPE_CODE_FUNCTION;
790 TypeVals.push_back(FT->isVarArg());
791 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
792 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
793 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
794 AbbrevToUse = FunctionAbbrev;
797 case Type::StructTyID: {
798 StructType *ST = cast<StructType>(T);
799 // STRUCT: [ispacked, eltty x N]
800 TypeVals.push_back(ST->isPacked());
801 // Output all of the element types.
802 for (StructType::element_iterator I = ST->element_begin(),
803 E = ST->element_end(); I != E; ++I)
804 TypeVals.push_back(VE.getTypeID(*I));
806 if (ST->isLiteral()) {
807 Code = bitc::TYPE_CODE_STRUCT_ANON;
808 AbbrevToUse = StructAnonAbbrev;
810 if (ST->isOpaque()) {
811 Code = bitc::TYPE_CODE_OPAQUE;
813 Code = bitc::TYPE_CODE_STRUCT_NAMED;
814 AbbrevToUse = StructNamedAbbrev;
817 // Emit the name if it is present.
818 if (!ST->getName().empty())
819 writeStringRecord(Stream, bitc::TYPE_CODE_STRUCT_NAME, ST->getName(),
824 case Type::ArrayTyID: {
825 ArrayType *AT = cast<ArrayType>(T);
826 // ARRAY: [numelts, eltty]
827 Code = bitc::TYPE_CODE_ARRAY;
828 TypeVals.push_back(AT->getNumElements());
829 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
830 AbbrevToUse = ArrayAbbrev;
833 case Type::VectorTyID: {
834 VectorType *VT = cast<VectorType>(T);
835 // VECTOR [numelts, eltty]
836 Code = bitc::TYPE_CODE_VECTOR;
837 TypeVals.push_back(VT->getNumElements());
838 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
843 // Emit the finished record.
844 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
851 static unsigned getEncodedLinkage(const GlobalValue::LinkageTypes Linkage) {
853 case GlobalValue::ExternalLinkage:
855 case GlobalValue::WeakAnyLinkage:
857 case GlobalValue::AppendingLinkage:
859 case GlobalValue::InternalLinkage:
861 case GlobalValue::LinkOnceAnyLinkage:
863 case GlobalValue::ExternalWeakLinkage:
865 case GlobalValue::CommonLinkage:
867 case GlobalValue::PrivateLinkage:
869 case GlobalValue::WeakODRLinkage:
871 case GlobalValue::LinkOnceODRLinkage:
873 case GlobalValue::AvailableExternallyLinkage:
876 llvm_unreachable("Invalid linkage");
879 static unsigned getEncodedLinkage(const GlobalValue &GV) {
880 return getEncodedLinkage(GV.getLinkage());
883 // Decode the flags for GlobalValue in the summary
884 static uint64_t getEncodedGVSummaryFlags(GlobalValueSummary::GVFlags Flags) {
885 uint64_t RawFlags = 0;
887 RawFlags |= Flags.NotEligibleToImport; // bool
888 RawFlags |= (Flags.Live << 1);
889 // Linkage don't need to be remapped at that time for the summary. Any future
890 // change to the getEncodedLinkage() function will need to be taken into
891 // account here as well.
892 RawFlags = (RawFlags << 4) | Flags.Linkage; // 4 bits
897 static unsigned getEncodedVisibility(const GlobalValue &GV) {
898 switch (GV.getVisibility()) {
899 case GlobalValue::DefaultVisibility: return 0;
900 case GlobalValue::HiddenVisibility: return 1;
901 case GlobalValue::ProtectedVisibility: return 2;
903 llvm_unreachable("Invalid visibility");
906 static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) {
907 switch (GV.getDLLStorageClass()) {
908 case GlobalValue::DefaultStorageClass: return 0;
909 case GlobalValue::DLLImportStorageClass: return 1;
910 case GlobalValue::DLLExportStorageClass: return 2;
912 llvm_unreachable("Invalid DLL storage class");
915 static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) {
916 switch (GV.getThreadLocalMode()) {
917 case GlobalVariable::NotThreadLocal: return 0;
918 case GlobalVariable::GeneralDynamicTLSModel: return 1;
919 case GlobalVariable::LocalDynamicTLSModel: return 2;
920 case GlobalVariable::InitialExecTLSModel: return 3;
921 case GlobalVariable::LocalExecTLSModel: return 4;
923 llvm_unreachable("Invalid TLS model");
926 static unsigned getEncodedComdatSelectionKind(const Comdat &C) {
927 switch (C.getSelectionKind()) {
929 return bitc::COMDAT_SELECTION_KIND_ANY;
930 case Comdat::ExactMatch:
931 return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH;
932 case Comdat::Largest:
933 return bitc::COMDAT_SELECTION_KIND_LARGEST;
934 case Comdat::NoDuplicates:
935 return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES;
936 case Comdat::SameSize:
937 return bitc::COMDAT_SELECTION_KIND_SAME_SIZE;
939 llvm_unreachable("Invalid selection kind");
942 static unsigned getEncodedUnnamedAddr(const GlobalValue &GV) {
943 switch (GV.getUnnamedAddr()) {
944 case GlobalValue::UnnamedAddr::None: return 0;
945 case GlobalValue::UnnamedAddr::Local: return 2;
946 case GlobalValue::UnnamedAddr::Global: return 1;
948 llvm_unreachable("Invalid unnamed_addr");
951 size_t ModuleBitcodeWriter::addToStrtab(StringRef Str) {
954 return StrtabBuilder.add(Str);
957 void ModuleBitcodeWriter::writeComdats() {
958 SmallVector<unsigned, 64> Vals;
959 for (const Comdat *C : VE.getComdats()) {
960 // COMDAT: [strtab offset, strtab size, selection_kind]
961 Vals.push_back(addToStrtab(C->getName()));
962 Vals.push_back(C->getName().size());
963 Vals.push_back(getEncodedComdatSelectionKind(*C));
964 Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
969 /// Write a record that will eventually hold the word offset of the
970 /// module-level VST. For now the offset is 0, which will be backpatched
971 /// after the real VST is written. Saves the bit offset to backpatch.
972 void ModuleBitcodeWriter::writeValueSymbolTableForwardDecl() {
973 // Write a placeholder value in for the offset of the real VST,
974 // which is written after the function blocks so that it can include
975 // the offset of each function. The placeholder offset will be
976 // updated when the real VST is written.
977 auto Abbv = std::make_shared<BitCodeAbbrev>();
978 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_VSTOFFSET));
979 // Blocks are 32-bit aligned, so we can use a 32-bit word offset to
980 // hold the real VST offset. Must use fixed instead of VBR as we don't
981 // know how many VBR chunks to reserve ahead of time.
982 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
983 unsigned VSTOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
985 // Emit the placeholder
986 uint64_t Vals[] = {bitc::MODULE_CODE_VSTOFFSET, 0};
987 Stream.EmitRecordWithAbbrev(VSTOffsetAbbrev, Vals);
989 // Compute and save the bit offset to the placeholder, which will be
990 // patched when the real VST is written. We can simply subtract the 32-bit
991 // fixed size from the current bit number to get the location to backpatch.
992 VSTOffsetPlaceholder = Stream.GetCurrentBitNo() - 32;
995 enum StringEncoding { SE_Char6, SE_Fixed7, SE_Fixed8 };
997 /// Determine the encoding to use for the given string name and length.
998 static StringEncoding getStringEncoding(StringRef Str) {
1000 for (char C : Str) {
1002 isChar6 = BitCodeAbbrevOp::isChar6(C);
1003 if ((unsigned char)C & 128)
1004 // don't bother scanning the rest.
1012 /// Emit top-level description of module, including target triple, inline asm,
1013 /// descriptors for global variables, and function prototype info.
1014 /// Returns the bit offset to backpatch with the location of the real VST.
1015 void ModuleBitcodeWriter::writeModuleInfo() {
1016 // Emit various pieces of data attached to a module.
1017 if (!M.getTargetTriple().empty())
1018 writeStringRecord(Stream, bitc::MODULE_CODE_TRIPLE, M.getTargetTriple(),
1020 const std::string &DL = M.getDataLayoutStr();
1022 writeStringRecord(Stream, bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/);
1023 if (!M.getModuleInlineAsm().empty())
1024 writeStringRecord(Stream, bitc::MODULE_CODE_ASM, M.getModuleInlineAsm(),
1027 // Emit information about sections and GC, computing how many there are. Also
1028 // compute the maximum alignment value.
1029 std::map<std::string, unsigned> SectionMap;
1030 std::map<std::string, unsigned> GCMap;
1031 unsigned MaxAlignment = 0;
1032 unsigned MaxGlobalType = 0;
1033 for (const GlobalValue &GV : M.globals()) {
1034 MaxAlignment = std::max(MaxAlignment, GV.getAlignment());
1035 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getValueType()));
1036 if (GV.hasSection()) {
1037 // Give section names unique ID's.
1038 unsigned &Entry = SectionMap[GV.getSection()];
1040 writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, GV.getSection(),
1042 Entry = SectionMap.size();
1046 for (const Function &F : M) {
1047 MaxAlignment = std::max(MaxAlignment, F.getAlignment());
1048 if (F.hasSection()) {
1049 // Give section names unique ID's.
1050 unsigned &Entry = SectionMap[F.getSection()];
1052 writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, F.getSection(),
1054 Entry = SectionMap.size();
1058 // Same for GC names.
1059 unsigned &Entry = GCMap[F.getGC()];
1061 writeStringRecord(Stream, bitc::MODULE_CODE_GCNAME, F.getGC(),
1063 Entry = GCMap.size();
1068 // Emit abbrev for globals, now that we know # sections and max alignment.
1069 unsigned SimpleGVarAbbrev = 0;
1070 if (!M.global_empty()) {
1071 // Add an abbrev for common globals with no visibility or thread localness.
1072 auto Abbv = std::make_shared<BitCodeAbbrev>();
1073 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
1074 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1075 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1076 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1077 Log2_32_Ceil(MaxGlobalType+1)));
1078 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // AddrSpace << 2
1079 //| explicitType << 1
1081 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
1082 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage.
1083 if (MaxAlignment == 0) // Alignment.
1084 Abbv->Add(BitCodeAbbrevOp(0));
1086 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
1087 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1088 Log2_32_Ceil(MaxEncAlignment+1)));
1090 if (SectionMap.empty()) // Section.
1091 Abbv->Add(BitCodeAbbrevOp(0));
1093 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1094 Log2_32_Ceil(SectionMap.size()+1)));
1095 // Don't bother emitting vis + thread local.
1096 SimpleGVarAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1099 SmallVector<unsigned, 64> Vals;
1100 // Emit the module's source file name.
1102 StringEncoding Bits = getStringEncoding(M.getSourceFileName());
1103 BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8);
1104 if (Bits == SE_Char6)
1105 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6);
1106 else if (Bits == SE_Fixed7)
1107 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7);
1109 // MODULE_CODE_SOURCE_FILENAME: [namechar x N]
1110 auto Abbv = std::make_shared<BitCodeAbbrev>();
1111 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME));
1112 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1113 Abbv->Add(AbbrevOpToUse);
1114 unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1116 for (const auto P : M.getSourceFileName())
1117 Vals.push_back((unsigned char)P);
1119 // Emit the finished record.
1120 Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev);
1124 // Emit the global variable information.
1125 for (const GlobalVariable &GV : M.globals()) {
1126 unsigned AbbrevToUse = 0;
1128 // GLOBALVAR: [strtab offset, strtab size, type, isconst, initid,
1129 // linkage, alignment, section, visibility, threadlocal,
1130 // unnamed_addr, externally_initialized, dllstorageclass,
1131 // comdat, attributes]
1132 Vals.push_back(addToStrtab(GV.getName()));
1133 Vals.push_back(GV.getName().size());
1134 Vals.push_back(VE.getTypeID(GV.getValueType()));
1135 Vals.push_back(GV.getType()->getAddressSpace() << 2 | 2 | GV.isConstant());
1136 Vals.push_back(GV.isDeclaration() ? 0 :
1137 (VE.getValueID(GV.getInitializer()) + 1));
1138 Vals.push_back(getEncodedLinkage(GV));
1139 Vals.push_back(Log2_32(GV.getAlignment())+1);
1140 Vals.push_back(GV.hasSection() ? SectionMap[GV.getSection()] : 0);
1141 if (GV.isThreadLocal() ||
1142 GV.getVisibility() != GlobalValue::DefaultVisibility ||
1143 GV.getUnnamedAddr() != GlobalValue::UnnamedAddr::None ||
1144 GV.isExternallyInitialized() ||
1145 GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass ||
1147 GV.hasAttributes()) {
1148 Vals.push_back(getEncodedVisibility(GV));
1149 Vals.push_back(getEncodedThreadLocalMode(GV));
1150 Vals.push_back(getEncodedUnnamedAddr(GV));
1151 Vals.push_back(GV.isExternallyInitialized());
1152 Vals.push_back(getEncodedDLLStorageClass(GV));
1153 Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0);
1155 auto AL = GV.getAttributesAsList(AttributeList::FunctionIndex);
1156 Vals.push_back(VE.getAttributeListID(AL));
1158 AbbrevToUse = SimpleGVarAbbrev;
1161 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
1165 // Emit the function proto information.
1166 for (const Function &F : M) {
1167 // FUNCTION: [strtab offset, strtab size, type, callingconv, isproto,
1168 // linkage, paramattrs, alignment, section, visibility, gc,
1169 // unnamed_addr, prologuedata, dllstorageclass, comdat,
1170 // prefixdata, personalityfn]
1171 Vals.push_back(addToStrtab(F.getName()));
1172 Vals.push_back(F.getName().size());
1173 Vals.push_back(VE.getTypeID(F.getFunctionType()));
1174 Vals.push_back(F.getCallingConv());
1175 Vals.push_back(F.isDeclaration());
1176 Vals.push_back(getEncodedLinkage(F));
1177 Vals.push_back(VE.getAttributeListID(F.getAttributes()));
1178 Vals.push_back(Log2_32(F.getAlignment())+1);
1179 Vals.push_back(F.hasSection() ? SectionMap[F.getSection()] : 0);
1180 Vals.push_back(getEncodedVisibility(F));
1181 Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0);
1182 Vals.push_back(getEncodedUnnamedAddr(F));
1183 Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1)
1185 Vals.push_back(getEncodedDLLStorageClass(F));
1186 Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0);
1187 Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1)
1190 F.hasPersonalityFn() ? (VE.getValueID(F.getPersonalityFn()) + 1) : 0);
1192 unsigned AbbrevToUse = 0;
1193 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
1197 // Emit the alias information.
1198 for (const GlobalAlias &A : M.aliases()) {
1199 // ALIAS: [strtab offset, strtab size, alias type, aliasee val#, linkage,
1200 // visibility, dllstorageclass, threadlocal, unnamed_addr]
1201 Vals.push_back(addToStrtab(A.getName()));
1202 Vals.push_back(A.getName().size());
1203 Vals.push_back(VE.getTypeID(A.getValueType()));
1204 Vals.push_back(A.getType()->getAddressSpace());
1205 Vals.push_back(VE.getValueID(A.getAliasee()));
1206 Vals.push_back(getEncodedLinkage(A));
1207 Vals.push_back(getEncodedVisibility(A));
1208 Vals.push_back(getEncodedDLLStorageClass(A));
1209 Vals.push_back(getEncodedThreadLocalMode(A));
1210 Vals.push_back(getEncodedUnnamedAddr(A));
1211 unsigned AbbrevToUse = 0;
1212 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
1216 // Emit the ifunc information.
1217 for (const GlobalIFunc &I : M.ifuncs()) {
1218 // IFUNC: [strtab offset, strtab size, ifunc type, address space, resolver
1219 // val#, linkage, visibility]
1220 Vals.push_back(addToStrtab(I.getName()));
1221 Vals.push_back(I.getName().size());
1222 Vals.push_back(VE.getTypeID(I.getValueType()));
1223 Vals.push_back(I.getType()->getAddressSpace());
1224 Vals.push_back(VE.getValueID(I.getResolver()));
1225 Vals.push_back(getEncodedLinkage(I));
1226 Vals.push_back(getEncodedVisibility(I));
1227 Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
1231 writeValueSymbolTableForwardDecl();
1234 static uint64_t getOptimizationFlags(const Value *V) {
1237 if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) {
1238 if (OBO->hasNoSignedWrap())
1239 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
1240 if (OBO->hasNoUnsignedWrap())
1241 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
1242 } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) {
1244 Flags |= 1 << bitc::PEO_EXACT;
1245 } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) {
1246 if (FPMO->hasUnsafeAlgebra())
1247 Flags |= FastMathFlags::UnsafeAlgebra;
1248 if (FPMO->hasNoNaNs())
1249 Flags |= FastMathFlags::NoNaNs;
1250 if (FPMO->hasNoInfs())
1251 Flags |= FastMathFlags::NoInfs;
1252 if (FPMO->hasNoSignedZeros())
1253 Flags |= FastMathFlags::NoSignedZeros;
1254 if (FPMO->hasAllowReciprocal())
1255 Flags |= FastMathFlags::AllowReciprocal;
1256 if (FPMO->hasAllowContract())
1257 Flags |= FastMathFlags::AllowContract;
1263 void ModuleBitcodeWriter::writeValueAsMetadata(
1264 const ValueAsMetadata *MD, SmallVectorImpl<uint64_t> &Record) {
1265 // Mimic an MDNode with a value as one operand.
1266 Value *V = MD->getValue();
1267 Record.push_back(VE.getTypeID(V->getType()));
1268 Record.push_back(VE.getValueID(V));
1269 Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0);
1273 void ModuleBitcodeWriter::writeMDTuple(const MDTuple *N,
1274 SmallVectorImpl<uint64_t> &Record,
1276 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
1277 Metadata *MD = N->getOperand(i);
1278 assert(!(MD && isa<LocalAsMetadata>(MD)) &&
1279 "Unexpected function-local metadata");
1280 Record.push_back(VE.getMetadataOrNullID(MD));
1282 Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
1283 : bitc::METADATA_NODE,
1288 unsigned ModuleBitcodeWriter::createDILocationAbbrev() {
1289 // Assume the column is usually under 128, and always output the inlined-at
1290 // location (it's never more expensive than building an array size 1).
1291 auto Abbv = std::make_shared<BitCodeAbbrev>();
1292 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION));
1293 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1294 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1295 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1296 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1297 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1298 return Stream.EmitAbbrev(std::move(Abbv));
1301 void ModuleBitcodeWriter::writeDILocation(const DILocation *N,
1302 SmallVectorImpl<uint64_t> &Record,
1305 Abbrev = createDILocationAbbrev();
1307 Record.push_back(N->isDistinct());
1308 Record.push_back(N->getLine());
1309 Record.push_back(N->getColumn());
1310 Record.push_back(VE.getMetadataID(N->getScope()));
1311 Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt()));
1313 Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
1317 unsigned ModuleBitcodeWriter::createGenericDINodeAbbrev() {
1318 // Assume the column is usually under 128, and always output the inlined-at
1319 // location (it's never more expensive than building an array size 1).
1320 auto Abbv = std::make_shared<BitCodeAbbrev>();
1321 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG));
1322 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1323 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1324 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1325 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1326 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1327 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1328 return Stream.EmitAbbrev(std::move(Abbv));
1331 void ModuleBitcodeWriter::writeGenericDINode(const GenericDINode *N,
1332 SmallVectorImpl<uint64_t> &Record,
1335 Abbrev = createGenericDINodeAbbrev();
1337 Record.push_back(N->isDistinct());
1338 Record.push_back(N->getTag());
1339 Record.push_back(0); // Per-tag version field; unused for now.
1341 for (auto &I : N->operands())
1342 Record.push_back(VE.getMetadataOrNullID(I));
1344 Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev);
1348 static uint64_t rotateSign(int64_t I) {
1350 return I < 0 ? ~(U << 1) : U << 1;
1353 void ModuleBitcodeWriter::writeDISubrange(const DISubrange *N,
1354 SmallVectorImpl<uint64_t> &Record,
1356 Record.push_back(N->isDistinct());
1357 Record.push_back(N->getCount());
1358 Record.push_back(rotateSign(N->getLowerBound()));
1360 Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
1364 void ModuleBitcodeWriter::writeDIEnumerator(const DIEnumerator *N,
1365 SmallVectorImpl<uint64_t> &Record,
1367 Record.push_back(N->isDistinct());
1368 Record.push_back(rotateSign(N->getValue()));
1369 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1371 Stream.EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev);
1375 void ModuleBitcodeWriter::writeDIBasicType(const DIBasicType *N,
1376 SmallVectorImpl<uint64_t> &Record,
1378 Record.push_back(N->isDistinct());
1379 Record.push_back(N->getTag());
1380 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1381 Record.push_back(N->getSizeInBits());
1382 Record.push_back(N->getAlignInBits());
1383 Record.push_back(N->getEncoding());
1385 Stream.EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev);
1389 void ModuleBitcodeWriter::writeDIDerivedType(const DIDerivedType *N,
1390 SmallVectorImpl<uint64_t> &Record,
1392 Record.push_back(N->isDistinct());
1393 Record.push_back(N->getTag());
1394 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1395 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1396 Record.push_back(N->getLine());
1397 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1398 Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
1399 Record.push_back(N->getSizeInBits());
1400 Record.push_back(N->getAlignInBits());
1401 Record.push_back(N->getOffsetInBits());
1402 Record.push_back(N->getFlags());
1403 Record.push_back(VE.getMetadataOrNullID(N->getExtraData()));
1405 // DWARF address space is encoded as N->getDWARFAddressSpace() + 1. 0 means
1406 // that there is no DWARF address space associated with DIDerivedType.
1407 if (const auto &DWARFAddressSpace = N->getDWARFAddressSpace())
1408 Record.push_back(*DWARFAddressSpace + 1);
1410 Record.push_back(0);
1412 Stream.EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev);
1416 void ModuleBitcodeWriter::writeDICompositeType(
1417 const DICompositeType *N, SmallVectorImpl<uint64_t> &Record,
1419 const unsigned IsNotUsedInOldTypeRef = 0x2;
1420 Record.push_back(IsNotUsedInOldTypeRef | (unsigned)N->isDistinct());
1421 Record.push_back(N->getTag());
1422 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1423 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1424 Record.push_back(N->getLine());
1425 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1426 Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
1427 Record.push_back(N->getSizeInBits());
1428 Record.push_back(N->getAlignInBits());
1429 Record.push_back(N->getOffsetInBits());
1430 Record.push_back(N->getFlags());
1431 Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
1432 Record.push_back(N->getRuntimeLang());
1433 Record.push_back(VE.getMetadataOrNullID(N->getVTableHolder()));
1434 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
1435 Record.push_back(VE.getMetadataOrNullID(N->getRawIdentifier()));
1437 Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev);
1441 void ModuleBitcodeWriter::writeDISubroutineType(
1442 const DISubroutineType *N, SmallVectorImpl<uint64_t> &Record,
1444 const unsigned HasNoOldTypeRefs = 0x2;
1445 Record.push_back(HasNoOldTypeRefs | (unsigned)N->isDistinct());
1446 Record.push_back(N->getFlags());
1447 Record.push_back(VE.getMetadataOrNullID(N->getTypeArray().get()));
1448 Record.push_back(N->getCC());
1450 Stream.EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev);
1454 void ModuleBitcodeWriter::writeDIFile(const DIFile *N,
1455 SmallVectorImpl<uint64_t> &Record,
1457 Record.push_back(N->isDistinct());
1458 Record.push_back(VE.getMetadataOrNullID(N->getRawFilename()));
1459 Record.push_back(VE.getMetadataOrNullID(N->getRawDirectory()));
1460 Record.push_back(N->getChecksumKind());
1461 Record.push_back(VE.getMetadataOrNullID(N->getRawChecksum()));
1463 Stream.EmitRecord(bitc::METADATA_FILE, Record, Abbrev);
1467 void ModuleBitcodeWriter::writeDICompileUnit(const DICompileUnit *N,
1468 SmallVectorImpl<uint64_t> &Record,
1470 assert(N->isDistinct() && "Expected distinct compile units");
1471 Record.push_back(/* IsDistinct */ true);
1472 Record.push_back(N->getSourceLanguage());
1473 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1474 Record.push_back(VE.getMetadataOrNullID(N->getRawProducer()));
1475 Record.push_back(N->isOptimized());
1476 Record.push_back(VE.getMetadataOrNullID(N->getRawFlags()));
1477 Record.push_back(N->getRuntimeVersion());
1478 Record.push_back(VE.getMetadataOrNullID(N->getRawSplitDebugFilename()));
1479 Record.push_back(N->getEmissionKind());
1480 Record.push_back(VE.getMetadataOrNullID(N->getEnumTypes().get()));
1481 Record.push_back(VE.getMetadataOrNullID(N->getRetainedTypes().get()));
1482 Record.push_back(/* subprograms */ 0);
1483 Record.push_back(VE.getMetadataOrNullID(N->getGlobalVariables().get()));
1484 Record.push_back(VE.getMetadataOrNullID(N->getImportedEntities().get()));
1485 Record.push_back(N->getDWOId());
1486 Record.push_back(VE.getMetadataOrNullID(N->getMacros().get()));
1487 Record.push_back(N->getSplitDebugInlining());
1488 Record.push_back(N->getDebugInfoForProfiling());
1490 Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev);
1494 void ModuleBitcodeWriter::writeDISubprogram(const DISubprogram *N,
1495 SmallVectorImpl<uint64_t> &Record,
1497 uint64_t HasUnitFlag = 1 << 1;
1498 Record.push_back(N->isDistinct() | HasUnitFlag);
1499 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1500 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1501 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
1502 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1503 Record.push_back(N->getLine());
1504 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1505 Record.push_back(N->isLocalToUnit());
1506 Record.push_back(N->isDefinition());
1507 Record.push_back(N->getScopeLine());
1508 Record.push_back(VE.getMetadataOrNullID(N->getContainingType()));
1509 Record.push_back(N->getVirtuality());
1510 Record.push_back(N->getVirtualIndex());
1511 Record.push_back(N->getFlags());
1512 Record.push_back(N->isOptimized());
1513 Record.push_back(VE.getMetadataOrNullID(N->getRawUnit()));
1514 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
1515 Record.push_back(VE.getMetadataOrNullID(N->getDeclaration()));
1516 Record.push_back(VE.getMetadataOrNullID(N->getVariables().get()));
1517 Record.push_back(N->getThisAdjustment());
1518 Record.push_back(VE.getMetadataOrNullID(N->getThrownTypes().get()));
1520 Stream.EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev);
1524 void ModuleBitcodeWriter::writeDILexicalBlock(const DILexicalBlock *N,
1525 SmallVectorImpl<uint64_t> &Record,
1527 Record.push_back(N->isDistinct());
1528 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1529 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1530 Record.push_back(N->getLine());
1531 Record.push_back(N->getColumn());
1533 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev);
1537 void ModuleBitcodeWriter::writeDILexicalBlockFile(
1538 const DILexicalBlockFile *N, SmallVectorImpl<uint64_t> &Record,
1540 Record.push_back(N->isDistinct());
1541 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1542 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1543 Record.push_back(N->getDiscriminator());
1545 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev);
1549 void ModuleBitcodeWriter::writeDINamespace(const DINamespace *N,
1550 SmallVectorImpl<uint64_t> &Record,
1552 Record.push_back(N->isDistinct() | N->getExportSymbols() << 1);
1553 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1554 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1556 Stream.EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev);
1560 void ModuleBitcodeWriter::writeDIMacro(const DIMacro *N,
1561 SmallVectorImpl<uint64_t> &Record,
1563 Record.push_back(N->isDistinct());
1564 Record.push_back(N->getMacinfoType());
1565 Record.push_back(N->getLine());
1566 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1567 Record.push_back(VE.getMetadataOrNullID(N->getRawValue()));
1569 Stream.EmitRecord(bitc::METADATA_MACRO, Record, Abbrev);
1573 void ModuleBitcodeWriter::writeDIMacroFile(const DIMacroFile *N,
1574 SmallVectorImpl<uint64_t> &Record,
1576 Record.push_back(N->isDistinct());
1577 Record.push_back(N->getMacinfoType());
1578 Record.push_back(N->getLine());
1579 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1580 Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
1582 Stream.EmitRecord(bitc::METADATA_MACRO_FILE, Record, Abbrev);
1586 void ModuleBitcodeWriter::writeDIModule(const DIModule *N,
1587 SmallVectorImpl<uint64_t> &Record,
1589 Record.push_back(N->isDistinct());
1590 for (auto &I : N->operands())
1591 Record.push_back(VE.getMetadataOrNullID(I));
1593 Stream.EmitRecord(bitc::METADATA_MODULE, Record, Abbrev);
1597 void ModuleBitcodeWriter::writeDITemplateTypeParameter(
1598 const DITemplateTypeParameter *N, SmallVectorImpl<uint64_t> &Record,
1600 Record.push_back(N->isDistinct());
1601 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1602 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1604 Stream.EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev);
1608 void ModuleBitcodeWriter::writeDITemplateValueParameter(
1609 const DITemplateValueParameter *N, SmallVectorImpl<uint64_t> &Record,
1611 Record.push_back(N->isDistinct());
1612 Record.push_back(N->getTag());
1613 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1614 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1615 Record.push_back(VE.getMetadataOrNullID(N->getValue()));
1617 Stream.EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev);
1621 void ModuleBitcodeWriter::writeDIGlobalVariable(
1622 const DIGlobalVariable *N, SmallVectorImpl<uint64_t> &Record,
1624 const uint64_t Version = 1 << 1;
1625 Record.push_back((uint64_t)N->isDistinct() | Version);
1626 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1627 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1628 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
1629 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1630 Record.push_back(N->getLine());
1631 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1632 Record.push_back(N->isLocalToUnit());
1633 Record.push_back(N->isDefinition());
1634 Record.push_back(/* expr */ 0);
1635 Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration()));
1636 Record.push_back(N->getAlignInBits());
1638 Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev);
1642 void ModuleBitcodeWriter::writeDILocalVariable(
1643 const DILocalVariable *N, SmallVectorImpl<uint64_t> &Record,
1645 // In order to support all possible bitcode formats in BitcodeReader we need
1646 // to distinguish the following cases:
1647 // 1) Record has no artificial tag (Record[1]),
1648 // has no obsolete inlinedAt field (Record[9]).
1649 // In this case Record size will be 8, HasAlignment flag is false.
1650 // 2) Record has artificial tag (Record[1]),
1651 // has no obsolete inlignedAt field (Record[9]).
1652 // In this case Record size will be 9, HasAlignment flag is false.
1653 // 3) Record has both artificial tag (Record[1]) and
1654 // obsolete inlignedAt field (Record[9]).
1655 // In this case Record size will be 10, HasAlignment flag is false.
1656 // 4) Record has neither artificial tag, nor inlignedAt field, but
1657 // HasAlignment flag is true and Record[8] contains alignment value.
1658 const uint64_t HasAlignmentFlag = 1 << 1;
1659 Record.push_back((uint64_t)N->isDistinct() | HasAlignmentFlag);
1660 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1661 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1662 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1663 Record.push_back(N->getLine());
1664 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1665 Record.push_back(N->getArg());
1666 Record.push_back(N->getFlags());
1667 Record.push_back(N->getAlignInBits());
1669 Stream.EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev);
1673 void ModuleBitcodeWriter::writeDIExpression(const DIExpression *N,
1674 SmallVectorImpl<uint64_t> &Record,
1676 Record.reserve(N->getElements().size() + 1);
1677 const uint64_t Version = 3 << 1;
1678 Record.push_back((uint64_t)N->isDistinct() | Version);
1679 Record.append(N->elements_begin(), N->elements_end());
1681 Stream.EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev);
1685 void ModuleBitcodeWriter::writeDIGlobalVariableExpression(
1686 const DIGlobalVariableExpression *N, SmallVectorImpl<uint64_t> &Record,
1688 Record.push_back(N->isDistinct());
1689 Record.push_back(VE.getMetadataOrNullID(N->getVariable()));
1690 Record.push_back(VE.getMetadataOrNullID(N->getExpression()));
1692 Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR_EXPR, Record, Abbrev);
1696 void ModuleBitcodeWriter::writeDIObjCProperty(const DIObjCProperty *N,
1697 SmallVectorImpl<uint64_t> &Record,
1699 Record.push_back(N->isDistinct());
1700 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1701 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1702 Record.push_back(N->getLine());
1703 Record.push_back(VE.getMetadataOrNullID(N->getRawSetterName()));
1704 Record.push_back(VE.getMetadataOrNullID(N->getRawGetterName()));
1705 Record.push_back(N->getAttributes());
1706 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1708 Stream.EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev);
1712 void ModuleBitcodeWriter::writeDIImportedEntity(
1713 const DIImportedEntity *N, SmallVectorImpl<uint64_t> &Record,
1715 Record.push_back(N->isDistinct());
1716 Record.push_back(N->getTag());
1717 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1718 Record.push_back(VE.getMetadataOrNullID(N->getEntity()));
1719 Record.push_back(N->getLine());
1720 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1721 Record.push_back(VE.getMetadataOrNullID(N->getRawFile()));
1723 Stream.EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev);
1727 unsigned ModuleBitcodeWriter::createNamedMetadataAbbrev() {
1728 auto Abbv = std::make_shared<BitCodeAbbrev>();
1729 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME));
1730 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1731 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1732 return Stream.EmitAbbrev(std::move(Abbv));
1735 void ModuleBitcodeWriter::writeNamedMetadata(
1736 SmallVectorImpl<uint64_t> &Record) {
1737 if (M.named_metadata_empty())
1740 unsigned Abbrev = createNamedMetadataAbbrev();
1741 for (const NamedMDNode &NMD : M.named_metadata()) {
1743 StringRef Str = NMD.getName();
1744 Record.append(Str.bytes_begin(), Str.bytes_end());
1745 Stream.EmitRecord(bitc::METADATA_NAME, Record, Abbrev);
1748 // Write named metadata operands.
1749 for (const MDNode *N : NMD.operands())
1750 Record.push_back(VE.getMetadataID(N));
1751 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
1756 unsigned ModuleBitcodeWriter::createMetadataStringsAbbrev() {
1757 auto Abbv = std::make_shared<BitCodeAbbrev>();
1758 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRINGS));
1759 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of strings
1760 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // offset to chars
1761 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1762 return Stream.EmitAbbrev(std::move(Abbv));
1765 /// Write out a record for MDString.
1767 /// All the metadata strings in a metadata block are emitted in a single
1768 /// record. The sizes and strings themselves are shoved into a blob.
1769 void ModuleBitcodeWriter::writeMetadataStrings(
1770 ArrayRef<const Metadata *> Strings, SmallVectorImpl<uint64_t> &Record) {
1771 if (Strings.empty())
1774 // Start the record with the number of strings.
1775 Record.push_back(bitc::METADATA_STRINGS);
1776 Record.push_back(Strings.size());
1778 // Emit the sizes of the strings in the blob.
1779 SmallString<256> Blob;
1781 BitstreamWriter W(Blob);
1782 for (const Metadata *MD : Strings)
1783 W.EmitVBR(cast<MDString>(MD)->getLength(), 6);
1787 // Add the offset to the strings to the record.
1788 Record.push_back(Blob.size());
1790 // Add the strings to the blob.
1791 for (const Metadata *MD : Strings)
1792 Blob.append(cast<MDString>(MD)->getString());
1794 // Emit the final record.
1795 Stream.EmitRecordWithBlob(createMetadataStringsAbbrev(), Record, Blob);
1799 // Generates an enum to use as an index in the Abbrev array of Metadata record.
1800 enum MetadataAbbrev : unsigned {
1801 #define HANDLE_MDNODE_LEAF(CLASS) CLASS##AbbrevID,
1802 #include "llvm/IR/Metadata.def"
1806 void ModuleBitcodeWriter::writeMetadataRecords(
1807 ArrayRef<const Metadata *> MDs, SmallVectorImpl<uint64_t> &Record,
1808 std::vector<unsigned> *MDAbbrevs, std::vector<uint64_t> *IndexPos) {
1812 // Initialize MDNode abbreviations.
1813 #define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0;
1814 #include "llvm/IR/Metadata.def"
1816 for (const Metadata *MD : MDs) {
1818 IndexPos->push_back(Stream.GetCurrentBitNo());
1819 if (const MDNode *N = dyn_cast<MDNode>(MD)) {
1820 assert(N->isResolved() && "Expected forward references to be resolved");
1822 switch (N->getMetadataID()) {
1824 llvm_unreachable("Invalid MDNode subclass");
1825 #define HANDLE_MDNODE_LEAF(CLASS) \
1826 case Metadata::CLASS##Kind: \
1828 write##CLASS(cast<CLASS>(N), Record, \
1829 (*MDAbbrevs)[MetadataAbbrev::CLASS##AbbrevID]); \
1831 write##CLASS(cast<CLASS>(N), Record, CLASS##Abbrev); \
1833 #include "llvm/IR/Metadata.def"
1836 writeValueAsMetadata(cast<ValueAsMetadata>(MD), Record);
1840 void ModuleBitcodeWriter::writeModuleMetadata() {
1841 if (!VE.hasMDs() && M.named_metadata_empty())
1844 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 4);
1845 SmallVector<uint64_t, 64> Record;
1847 // Emit all abbrevs upfront, so that the reader can jump in the middle of the
1848 // block and load any metadata.
1849 std::vector<unsigned> MDAbbrevs;
1851 MDAbbrevs.resize(MetadataAbbrev::LastPlusOne);
1852 MDAbbrevs[MetadataAbbrev::DILocationAbbrevID] = createDILocationAbbrev();
1853 MDAbbrevs[MetadataAbbrev::GenericDINodeAbbrevID] =
1854 createGenericDINodeAbbrev();
1856 auto Abbv = std::make_shared<BitCodeAbbrev>();
1857 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX_OFFSET));
1858 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1859 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1860 unsigned OffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1862 Abbv = std::make_shared<BitCodeAbbrev>();
1863 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX));
1864 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1865 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1866 unsigned IndexAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1868 // Emit MDStrings together upfront.
1869 writeMetadataStrings(VE.getMDStrings(), Record);
1871 // We only emit an index for the metadata record if we have more than a given
1872 // (naive) threshold of metadatas, otherwise it is not worth it.
1873 if (VE.getNonMDStrings().size() > IndexThreshold) {
1874 // Write a placeholder value in for the offset of the metadata index,
1875 // which is written after the records, so that it can include
1876 // the offset of each entry. The placeholder offset will be
1877 // updated after all records are emitted.
1878 uint64_t Vals[] = {0, 0};
1879 Stream.EmitRecord(bitc::METADATA_INDEX_OFFSET, Vals, OffsetAbbrev);
1882 // Compute and save the bit offset to the current position, which will be
1883 // patched when we emit the index later. We can simply subtract the 64-bit
1884 // fixed size from the current bit number to get the location to backpatch.
1885 uint64_t IndexOffsetRecordBitPos = Stream.GetCurrentBitNo();
1887 // This index will contain the bitpos for each individual record.
1888 std::vector<uint64_t> IndexPos;
1889 IndexPos.reserve(VE.getNonMDStrings().size());
1891 // Write all the records
1892 writeMetadataRecords(VE.getNonMDStrings(), Record, &MDAbbrevs, &IndexPos);
1894 if (VE.getNonMDStrings().size() > IndexThreshold) {
1895 // Now that we have emitted all the records we will emit the index. But
1897 // backpatch the forward reference so that the reader can skip the records
1899 Stream.BackpatchWord64(IndexOffsetRecordBitPos - 64,
1900 Stream.GetCurrentBitNo() - IndexOffsetRecordBitPos);
1902 // Delta encode the index.
1903 uint64_t PreviousValue = IndexOffsetRecordBitPos;
1904 for (auto &Elt : IndexPos) {
1905 auto EltDelta = Elt - PreviousValue;
1906 PreviousValue = Elt;
1909 // Emit the index record.
1910 Stream.EmitRecord(bitc::METADATA_INDEX, IndexPos, IndexAbbrev);
1914 // Write the named metadata now.
1915 writeNamedMetadata(Record);
1917 auto AddDeclAttachedMetadata = [&](const GlobalObject &GO) {
1918 SmallVector<uint64_t, 4> Record;
1919 Record.push_back(VE.getValueID(&GO));
1920 pushGlobalMetadataAttachment(Record, GO);
1921 Stream.EmitRecord(bitc::METADATA_GLOBAL_DECL_ATTACHMENT, Record);
1923 for (const Function &F : M)
1924 if (F.isDeclaration() && F.hasMetadata())
1925 AddDeclAttachedMetadata(F);
1926 // FIXME: Only store metadata for declarations here, and move data for global
1927 // variable definitions to a separate block (PR28134).
1928 for (const GlobalVariable &GV : M.globals())
1929 if (GV.hasMetadata())
1930 AddDeclAttachedMetadata(GV);
1935 void ModuleBitcodeWriter::writeFunctionMetadata(const Function &F) {
1939 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
1940 SmallVector<uint64_t, 64> Record;
1941 writeMetadataStrings(VE.getMDStrings(), Record);
1942 writeMetadataRecords(VE.getNonMDStrings(), Record);
1946 void ModuleBitcodeWriter::pushGlobalMetadataAttachment(
1947 SmallVectorImpl<uint64_t> &Record, const GlobalObject &GO) {
1948 // [n x [id, mdnode]]
1949 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
1950 GO.getAllMetadata(MDs);
1951 for (const auto &I : MDs) {
1952 Record.push_back(I.first);
1953 Record.push_back(VE.getMetadataID(I.second));
1957 void ModuleBitcodeWriter::writeFunctionMetadataAttachment(const Function &F) {
1958 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
1960 SmallVector<uint64_t, 64> Record;
1962 if (F.hasMetadata()) {
1963 pushGlobalMetadataAttachment(Record, F);
1964 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
1968 // Write metadata attachments
1969 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
1970 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
1971 for (const BasicBlock &BB : F)
1972 for (const Instruction &I : BB) {
1974 I.getAllMetadataOtherThanDebugLoc(MDs);
1976 // If no metadata, ignore instruction.
1977 if (MDs.empty()) continue;
1979 Record.push_back(VE.getInstructionID(&I));
1981 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
1982 Record.push_back(MDs[i].first);
1983 Record.push_back(VE.getMetadataID(MDs[i].second));
1985 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
1992 void ModuleBitcodeWriter::writeModuleMetadataKinds() {
1993 SmallVector<uint64_t, 64> Record;
1995 // Write metadata kinds
1996 // METADATA_KIND - [n x [id, name]]
1997 SmallVector<StringRef, 8> Names;
1998 M.getMDKindNames(Names);
2000 if (Names.empty()) return;
2002 Stream.EnterSubblock(bitc::METADATA_KIND_BLOCK_ID, 3);
2004 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
2005 Record.push_back(MDKindID);
2006 StringRef KName = Names[MDKindID];
2007 Record.append(KName.begin(), KName.end());
2009 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
2016 void ModuleBitcodeWriter::writeOperandBundleTags() {
2017 // Write metadata kinds
2019 // OPERAND_BUNDLE_TAGS_BLOCK_ID : N x OPERAND_BUNDLE_TAG
2021 // OPERAND_BUNDLE_TAG - [strchr x N]
2023 SmallVector<StringRef, 8> Tags;
2024 M.getOperandBundleTags(Tags);
2029 Stream.EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3);
2031 SmallVector<uint64_t, 64> Record;
2033 for (auto Tag : Tags) {
2034 Record.append(Tag.begin(), Tag.end());
2036 Stream.EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0);
2043 void ModuleBitcodeWriter::writeSyncScopeNames() {
2044 SmallVector<StringRef, 8> SSNs;
2045 M.getContext().getSyncScopeNames(SSNs);
2049 Stream.EnterSubblock(bitc::SYNC_SCOPE_NAMES_BLOCK_ID, 2);
2051 SmallVector<uint64_t, 64> Record;
2052 for (auto SSN : SSNs) {
2053 Record.append(SSN.begin(), SSN.end());
2054 Stream.EmitRecord(bitc::SYNC_SCOPE_NAME, Record, 0);
2061 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
2062 if ((int64_t)V >= 0)
2063 Vals.push_back(V << 1);
2065 Vals.push_back((-V << 1) | 1);
2068 void ModuleBitcodeWriter::writeConstants(unsigned FirstVal, unsigned LastVal,
2070 if (FirstVal == LastVal) return;
2072 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
2074 unsigned AggregateAbbrev = 0;
2075 unsigned String8Abbrev = 0;
2076 unsigned CString7Abbrev = 0;
2077 unsigned CString6Abbrev = 0;
2078 // If this is a constant pool for the module, emit module-specific abbrevs.
2080 // Abbrev for CST_CODE_AGGREGATE.
2081 auto Abbv = std::make_shared<BitCodeAbbrev>();
2082 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
2083 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2084 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
2085 AggregateAbbrev = Stream.EmitAbbrev(std::move(Abbv));
2087 // Abbrev for CST_CODE_STRING.
2088 Abbv = std::make_shared<BitCodeAbbrev>();
2089 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
2090 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2091 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
2092 String8Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2093 // Abbrev for CST_CODE_CSTRING.
2094 Abbv = std::make_shared<BitCodeAbbrev>();
2095 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
2096 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2097 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
2098 CString7Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2099 // Abbrev for CST_CODE_CSTRING.
2100 Abbv = std::make_shared<BitCodeAbbrev>();
2101 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
2102 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2103 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
2104 CString6Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2107 SmallVector<uint64_t, 64> Record;
2109 const ValueEnumerator::ValueList &Vals = VE.getValues();
2110 Type *LastTy = nullptr;
2111 for (unsigned i = FirstVal; i != LastVal; ++i) {
2112 const Value *V = Vals[i].first;
2113 // If we need to switch types, do so now.
2114 if (V->getType() != LastTy) {
2115 LastTy = V->getType();
2116 Record.push_back(VE.getTypeID(LastTy));
2117 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
2118 CONSTANTS_SETTYPE_ABBREV);
2122 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
2123 Record.push_back(unsigned(IA->hasSideEffects()) |
2124 unsigned(IA->isAlignStack()) << 1 |
2125 unsigned(IA->getDialect()&1) << 2);
2127 // Add the asm string.
2128 const std::string &AsmStr = IA->getAsmString();
2129 Record.push_back(AsmStr.size());
2130 Record.append(AsmStr.begin(), AsmStr.end());
2132 // Add the constraint string.
2133 const std::string &ConstraintStr = IA->getConstraintString();
2134 Record.push_back(ConstraintStr.size());
2135 Record.append(ConstraintStr.begin(), ConstraintStr.end());
2136 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
2140 const Constant *C = cast<Constant>(V);
2141 unsigned Code = -1U;
2142 unsigned AbbrevToUse = 0;
2143 if (C->isNullValue()) {
2144 Code = bitc::CST_CODE_NULL;
2145 } else if (isa<UndefValue>(C)) {
2146 Code = bitc::CST_CODE_UNDEF;
2147 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
2148 if (IV->getBitWidth() <= 64) {
2149 uint64_t V = IV->getSExtValue();
2150 emitSignedInt64(Record, V);
2151 Code = bitc::CST_CODE_INTEGER;
2152 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
2153 } else { // Wide integers, > 64 bits in size.
2154 // We have an arbitrary precision integer value to write whose
2155 // bit width is > 64. However, in canonical unsigned integer
2156 // format it is likely that the high bits are going to be zero.
2157 // So, we only write the number of active words.
2158 unsigned NWords = IV->getValue().getActiveWords();
2159 const uint64_t *RawWords = IV->getValue().getRawData();
2160 for (unsigned i = 0; i != NWords; ++i) {
2161 emitSignedInt64(Record, RawWords[i]);
2163 Code = bitc::CST_CODE_WIDE_INTEGER;
2165 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
2166 Code = bitc::CST_CODE_FLOAT;
2167 Type *Ty = CFP->getType();
2168 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) {
2169 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
2170 } else if (Ty->isX86_FP80Ty()) {
2171 // api needed to prevent premature destruction
2172 // bits are not in the same order as a normal i80 APInt, compensate.
2173 APInt api = CFP->getValueAPF().bitcastToAPInt();
2174 const uint64_t *p = api.getRawData();
2175 Record.push_back((p[1] << 48) | (p[0] >> 16));
2176 Record.push_back(p[0] & 0xffffLL);
2177 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
2178 APInt api = CFP->getValueAPF().bitcastToAPInt();
2179 const uint64_t *p = api.getRawData();
2180 Record.push_back(p[0]);
2181 Record.push_back(p[1]);
2183 assert (0 && "Unknown FP type!");
2185 } else if (isa<ConstantDataSequential>(C) &&
2186 cast<ConstantDataSequential>(C)->isString()) {
2187 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
2188 // Emit constant strings specially.
2189 unsigned NumElts = Str->getNumElements();
2190 // If this is a null-terminated string, use the denser CSTRING encoding.
2191 if (Str->isCString()) {
2192 Code = bitc::CST_CODE_CSTRING;
2193 --NumElts; // Don't encode the null, which isn't allowed by char6.
2195 Code = bitc::CST_CODE_STRING;
2196 AbbrevToUse = String8Abbrev;
2198 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
2199 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
2200 for (unsigned i = 0; i != NumElts; ++i) {
2201 unsigned char V = Str->getElementAsInteger(i);
2202 Record.push_back(V);
2203 isCStr7 &= (V & 128) == 0;
2205 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
2209 AbbrevToUse = CString6Abbrev;
2211 AbbrevToUse = CString7Abbrev;
2212 } else if (const ConstantDataSequential *CDS =
2213 dyn_cast<ConstantDataSequential>(C)) {
2214 Code = bitc::CST_CODE_DATA;
2215 Type *EltTy = CDS->getType()->getElementType();
2216 if (isa<IntegerType>(EltTy)) {
2217 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
2218 Record.push_back(CDS->getElementAsInteger(i));
2220 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
2222 CDS->getElementAsAPFloat(i).bitcastToAPInt().getLimitedValue());
2224 } else if (isa<ConstantAggregate>(C)) {
2225 Code = bitc::CST_CODE_AGGREGATE;
2226 for (const Value *Op : C->operands())
2227 Record.push_back(VE.getValueID(Op));
2228 AbbrevToUse = AggregateAbbrev;
2229 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
2230 switch (CE->getOpcode()) {
2232 if (Instruction::isCast(CE->getOpcode())) {
2233 Code = bitc::CST_CODE_CE_CAST;
2234 Record.push_back(getEncodedCastOpcode(CE->getOpcode()));
2235 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2236 Record.push_back(VE.getValueID(C->getOperand(0)));
2237 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
2239 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
2240 Code = bitc::CST_CODE_CE_BINOP;
2241 Record.push_back(getEncodedBinaryOpcode(CE->getOpcode()));
2242 Record.push_back(VE.getValueID(C->getOperand(0)));
2243 Record.push_back(VE.getValueID(C->getOperand(1)));
2244 uint64_t Flags = getOptimizationFlags(CE);
2246 Record.push_back(Flags);
2249 case Instruction::GetElementPtr: {
2250 Code = bitc::CST_CODE_CE_GEP;
2251 const auto *GO = cast<GEPOperator>(C);
2252 Record.push_back(VE.getTypeID(GO->getSourceElementType()));
2253 if (Optional<unsigned> Idx = GO->getInRangeIndex()) {
2254 Code = bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX;
2255 Record.push_back((*Idx << 1) | GO->isInBounds());
2256 } else if (GO->isInBounds())
2257 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
2258 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
2259 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
2260 Record.push_back(VE.getValueID(C->getOperand(i)));
2264 case Instruction::Select:
2265 Code = bitc::CST_CODE_CE_SELECT;
2266 Record.push_back(VE.getValueID(C->getOperand(0)));
2267 Record.push_back(VE.getValueID(C->getOperand(1)));
2268 Record.push_back(VE.getValueID(C->getOperand(2)));
2270 case Instruction::ExtractElement:
2271 Code = bitc::CST_CODE_CE_EXTRACTELT;
2272 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2273 Record.push_back(VE.getValueID(C->getOperand(0)));
2274 Record.push_back(VE.getTypeID(C->getOperand(1)->getType()));
2275 Record.push_back(VE.getValueID(C->getOperand(1)));
2277 case Instruction::InsertElement:
2278 Code = bitc::CST_CODE_CE_INSERTELT;
2279 Record.push_back(VE.getValueID(C->getOperand(0)));
2280 Record.push_back(VE.getValueID(C->getOperand(1)));
2281 Record.push_back(VE.getTypeID(C->getOperand(2)->getType()));
2282 Record.push_back(VE.getValueID(C->getOperand(2)));
2284 case Instruction::ShuffleVector:
2285 // If the return type and argument types are the same, this is a
2286 // standard shufflevector instruction. If the types are different,
2287 // then the shuffle is widening or truncating the input vectors, and
2288 // the argument type must also be encoded.
2289 if (C->getType() == C->getOperand(0)->getType()) {
2290 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
2292 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
2293 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2295 Record.push_back(VE.getValueID(C->getOperand(0)));
2296 Record.push_back(VE.getValueID(C->getOperand(1)));
2297 Record.push_back(VE.getValueID(C->getOperand(2)));
2299 case Instruction::ICmp:
2300 case Instruction::FCmp:
2301 Code = bitc::CST_CODE_CE_CMP;
2302 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2303 Record.push_back(VE.getValueID(C->getOperand(0)));
2304 Record.push_back(VE.getValueID(C->getOperand(1)));
2305 Record.push_back(CE->getPredicate());
2308 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
2309 Code = bitc::CST_CODE_BLOCKADDRESS;
2310 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
2311 Record.push_back(VE.getValueID(BA->getFunction()));
2312 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
2317 llvm_unreachable("Unknown constant!");
2319 Stream.EmitRecord(Code, Record, AbbrevToUse);
2326 void ModuleBitcodeWriter::writeModuleConstants() {
2327 const ValueEnumerator::ValueList &Vals = VE.getValues();
2329 // Find the first constant to emit, which is the first non-globalvalue value.
2330 // We know globalvalues have been emitted by WriteModuleInfo.
2331 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
2332 if (!isa<GlobalValue>(Vals[i].first)) {
2333 writeConstants(i, Vals.size(), true);
2339 /// pushValueAndType - The file has to encode both the value and type id for
2340 /// many values, because we need to know what type to create for forward
2341 /// references. However, most operands are not forward references, so this type
2342 /// field is not needed.
2344 /// This function adds V's value ID to Vals. If the value ID is higher than the
2345 /// instruction ID, then it is a forward reference, and it also includes the
2346 /// type ID. The value ID that is written is encoded relative to the InstID.
2347 bool ModuleBitcodeWriter::pushValueAndType(const Value *V, unsigned InstID,
2348 SmallVectorImpl<unsigned> &Vals) {
2349 unsigned ValID = VE.getValueID(V);
2350 // Make encoding relative to the InstID.
2351 Vals.push_back(InstID - ValID);
2352 if (ValID >= InstID) {
2353 Vals.push_back(VE.getTypeID(V->getType()));
2359 void ModuleBitcodeWriter::writeOperandBundles(ImmutableCallSite CS,
2361 SmallVector<unsigned, 64> Record;
2362 LLVMContext &C = CS.getInstruction()->getContext();
2364 for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i) {
2365 const auto &Bundle = CS.getOperandBundleAt(i);
2366 Record.push_back(C.getOperandBundleTagID(Bundle.getTagName()));
2368 for (auto &Input : Bundle.Inputs)
2369 pushValueAndType(Input, InstID, Record);
2371 Stream.EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record);
2376 /// pushValue - Like pushValueAndType, but where the type of the value is
2377 /// omitted (perhaps it was already encoded in an earlier operand).
2378 void ModuleBitcodeWriter::pushValue(const Value *V, unsigned InstID,
2379 SmallVectorImpl<unsigned> &Vals) {
2380 unsigned ValID = VE.getValueID(V);
2381 Vals.push_back(InstID - ValID);
2384 void ModuleBitcodeWriter::pushValueSigned(const Value *V, unsigned InstID,
2385 SmallVectorImpl<uint64_t> &Vals) {
2386 unsigned ValID = VE.getValueID(V);
2387 int64_t diff = ((int32_t)InstID - (int32_t)ValID);
2388 emitSignedInt64(Vals, diff);
2391 /// WriteInstruction - Emit an instruction to the specified stream.
2392 void ModuleBitcodeWriter::writeInstruction(const Instruction &I,
2394 SmallVectorImpl<unsigned> &Vals) {
2396 unsigned AbbrevToUse = 0;
2397 VE.setInstructionID(&I);
2398 switch (I.getOpcode()) {
2400 if (Instruction::isCast(I.getOpcode())) {
2401 Code = bitc::FUNC_CODE_INST_CAST;
2402 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2403 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
2404 Vals.push_back(VE.getTypeID(I.getType()));
2405 Vals.push_back(getEncodedCastOpcode(I.getOpcode()));
2407 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
2408 Code = bitc::FUNC_CODE_INST_BINOP;
2409 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2410 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
2411 pushValue(I.getOperand(1), InstID, Vals);
2412 Vals.push_back(getEncodedBinaryOpcode(I.getOpcode()));
2413 uint64_t Flags = getOptimizationFlags(&I);
2415 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
2416 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
2417 Vals.push_back(Flags);
2422 case Instruction::GetElementPtr: {
2423 Code = bitc::FUNC_CODE_INST_GEP;
2424 AbbrevToUse = FUNCTION_INST_GEP_ABBREV;
2425 auto &GEPInst = cast<GetElementPtrInst>(I);
2426 Vals.push_back(GEPInst.isInBounds());
2427 Vals.push_back(VE.getTypeID(GEPInst.getSourceElementType()));
2428 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
2429 pushValueAndType(I.getOperand(i), InstID, Vals);
2432 case Instruction::ExtractValue: {
2433 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
2434 pushValueAndType(I.getOperand(0), InstID, Vals);
2435 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
2436 Vals.append(EVI->idx_begin(), EVI->idx_end());
2439 case Instruction::InsertValue: {
2440 Code = bitc::FUNC_CODE_INST_INSERTVAL;
2441 pushValueAndType(I.getOperand(0), InstID, Vals);
2442 pushValueAndType(I.getOperand(1), InstID, Vals);
2443 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
2444 Vals.append(IVI->idx_begin(), IVI->idx_end());
2447 case Instruction::Select:
2448 Code = bitc::FUNC_CODE_INST_VSELECT;
2449 pushValueAndType(I.getOperand(1), InstID, Vals);
2450 pushValue(I.getOperand(2), InstID, Vals);
2451 pushValueAndType(I.getOperand(0), InstID, Vals);
2453 case Instruction::ExtractElement:
2454 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
2455 pushValueAndType(I.getOperand(0), InstID, Vals);
2456 pushValueAndType(I.getOperand(1), InstID, Vals);
2458 case Instruction::InsertElement:
2459 Code = bitc::FUNC_CODE_INST_INSERTELT;
2460 pushValueAndType(I.getOperand(0), InstID, Vals);
2461 pushValue(I.getOperand(1), InstID, Vals);
2462 pushValueAndType(I.getOperand(2), InstID, Vals);
2464 case Instruction::ShuffleVector:
2465 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
2466 pushValueAndType(I.getOperand(0), InstID, Vals);
2467 pushValue(I.getOperand(1), InstID, Vals);
2468 pushValue(I.getOperand(2), InstID, Vals);
2470 case Instruction::ICmp:
2471 case Instruction::FCmp: {
2472 // compare returning Int1Ty or vector of Int1Ty
2473 Code = bitc::FUNC_CODE_INST_CMP2;
2474 pushValueAndType(I.getOperand(0), InstID, Vals);
2475 pushValue(I.getOperand(1), InstID, Vals);
2476 Vals.push_back(cast<CmpInst>(I).getPredicate());
2477 uint64_t Flags = getOptimizationFlags(&I);
2479 Vals.push_back(Flags);
2483 case Instruction::Ret:
2485 Code = bitc::FUNC_CODE_INST_RET;
2486 unsigned NumOperands = I.getNumOperands();
2487 if (NumOperands == 0)
2488 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
2489 else if (NumOperands == 1) {
2490 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2491 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
2493 for (unsigned i = 0, e = NumOperands; i != e; ++i)
2494 pushValueAndType(I.getOperand(i), InstID, Vals);
2498 case Instruction::Br:
2500 Code = bitc::FUNC_CODE_INST_BR;
2501 const BranchInst &II = cast<BranchInst>(I);
2502 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
2503 if (II.isConditional()) {
2504 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
2505 pushValue(II.getCondition(), InstID, Vals);
2509 case Instruction::Switch:
2511 Code = bitc::FUNC_CODE_INST_SWITCH;
2512 const SwitchInst &SI = cast<SwitchInst>(I);
2513 Vals.push_back(VE.getTypeID(SI.getCondition()->getType()));
2514 pushValue(SI.getCondition(), InstID, Vals);
2515 Vals.push_back(VE.getValueID(SI.getDefaultDest()));
2516 for (auto Case : SI.cases()) {
2517 Vals.push_back(VE.getValueID(Case.getCaseValue()));
2518 Vals.push_back(VE.getValueID(Case.getCaseSuccessor()));
2522 case Instruction::IndirectBr:
2523 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
2524 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
2525 // Encode the address operand as relative, but not the basic blocks.
2526 pushValue(I.getOperand(0), InstID, Vals);
2527 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i)
2528 Vals.push_back(VE.getValueID(I.getOperand(i)));
2531 case Instruction::Invoke: {
2532 const InvokeInst *II = cast<InvokeInst>(&I);
2533 const Value *Callee = II->getCalledValue();
2534 FunctionType *FTy = II->getFunctionType();
2536 if (II->hasOperandBundles())
2537 writeOperandBundles(II, InstID);
2539 Code = bitc::FUNC_CODE_INST_INVOKE;
2541 Vals.push_back(VE.getAttributeListID(II->getAttributes()));
2542 Vals.push_back(II->getCallingConv() | 1 << 13);
2543 Vals.push_back(VE.getValueID(II->getNormalDest()));
2544 Vals.push_back(VE.getValueID(II->getUnwindDest()));
2545 Vals.push_back(VE.getTypeID(FTy));
2546 pushValueAndType(Callee, InstID, Vals);
2548 // Emit value #'s for the fixed parameters.
2549 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
2550 pushValue(I.getOperand(i), InstID, Vals); // fixed param.
2552 // Emit type/value pairs for varargs params.
2553 if (FTy->isVarArg()) {
2554 for (unsigned i = FTy->getNumParams(), e = II->getNumArgOperands();
2556 pushValueAndType(I.getOperand(i), InstID, Vals); // vararg
2560 case Instruction::Resume:
2561 Code = bitc::FUNC_CODE_INST_RESUME;
2562 pushValueAndType(I.getOperand(0), InstID, Vals);
2564 case Instruction::CleanupRet: {
2565 Code = bitc::FUNC_CODE_INST_CLEANUPRET;
2566 const auto &CRI = cast<CleanupReturnInst>(I);
2567 pushValue(CRI.getCleanupPad(), InstID, Vals);
2568 if (CRI.hasUnwindDest())
2569 Vals.push_back(VE.getValueID(CRI.getUnwindDest()));
2572 case Instruction::CatchRet: {
2573 Code = bitc::FUNC_CODE_INST_CATCHRET;
2574 const auto &CRI = cast<CatchReturnInst>(I);
2575 pushValue(CRI.getCatchPad(), InstID, Vals);
2576 Vals.push_back(VE.getValueID(CRI.getSuccessor()));
2579 case Instruction::CleanupPad:
2580 case Instruction::CatchPad: {
2581 const auto &FuncletPad = cast<FuncletPadInst>(I);
2582 Code = isa<CatchPadInst>(FuncletPad) ? bitc::FUNC_CODE_INST_CATCHPAD
2583 : bitc::FUNC_CODE_INST_CLEANUPPAD;
2584 pushValue(FuncletPad.getParentPad(), InstID, Vals);
2586 unsigned NumArgOperands = FuncletPad.getNumArgOperands();
2587 Vals.push_back(NumArgOperands);
2588 for (unsigned Op = 0; Op != NumArgOperands; ++Op)
2589 pushValueAndType(FuncletPad.getArgOperand(Op), InstID, Vals);
2592 case Instruction::CatchSwitch: {
2593 Code = bitc::FUNC_CODE_INST_CATCHSWITCH;
2594 const auto &CatchSwitch = cast<CatchSwitchInst>(I);
2596 pushValue(CatchSwitch.getParentPad(), InstID, Vals);
2598 unsigned NumHandlers = CatchSwitch.getNumHandlers();
2599 Vals.push_back(NumHandlers);
2600 for (const BasicBlock *CatchPadBB : CatchSwitch.handlers())
2601 Vals.push_back(VE.getValueID(CatchPadBB));
2603 if (CatchSwitch.hasUnwindDest())
2604 Vals.push_back(VE.getValueID(CatchSwitch.getUnwindDest()));
2607 case Instruction::Unreachable:
2608 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
2609 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
2612 case Instruction::PHI: {
2613 const PHINode &PN = cast<PHINode>(I);
2614 Code = bitc::FUNC_CODE_INST_PHI;
2615 // With the newer instruction encoding, forward references could give
2616 // negative valued IDs. This is most common for PHIs, so we use
2618 SmallVector<uint64_t, 128> Vals64;
2619 Vals64.push_back(VE.getTypeID(PN.getType()));
2620 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
2621 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64);
2622 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i)));
2624 // Emit a Vals64 vector and exit.
2625 Stream.EmitRecord(Code, Vals64, AbbrevToUse);
2630 case Instruction::LandingPad: {
2631 const LandingPadInst &LP = cast<LandingPadInst>(I);
2632 Code = bitc::FUNC_CODE_INST_LANDINGPAD;
2633 Vals.push_back(VE.getTypeID(LP.getType()));
2634 Vals.push_back(LP.isCleanup());
2635 Vals.push_back(LP.getNumClauses());
2636 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) {
2638 Vals.push_back(LandingPadInst::Catch);
2640 Vals.push_back(LandingPadInst::Filter);
2641 pushValueAndType(LP.getClause(I), InstID, Vals);
2646 case Instruction::Alloca: {
2647 Code = bitc::FUNC_CODE_INST_ALLOCA;
2648 const AllocaInst &AI = cast<AllocaInst>(I);
2649 Vals.push_back(VE.getTypeID(AI.getAllocatedType()));
2650 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
2651 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
2652 unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1;
2653 assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 &&
2654 "not enough bits for maximum alignment");
2655 assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64");
2656 AlignRecord |= AI.isUsedWithInAlloca() << 5;
2657 AlignRecord |= 1 << 6;
2658 AlignRecord |= AI.isSwiftError() << 7;
2659 Vals.push_back(AlignRecord);
2663 case Instruction::Load:
2664 if (cast<LoadInst>(I).isAtomic()) {
2665 Code = bitc::FUNC_CODE_INST_LOADATOMIC;
2666 pushValueAndType(I.getOperand(0), InstID, Vals);
2668 Code = bitc::FUNC_CODE_INST_LOAD;
2669 if (!pushValueAndType(I.getOperand(0), InstID, Vals)) // ptr
2670 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
2672 Vals.push_back(VE.getTypeID(I.getType()));
2673 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
2674 Vals.push_back(cast<LoadInst>(I).isVolatile());
2675 if (cast<LoadInst>(I).isAtomic()) {
2676 Vals.push_back(getEncodedOrdering(cast<LoadInst>(I).getOrdering()));
2677 Vals.push_back(getEncodedSyncScopeID(cast<LoadInst>(I).getSyncScopeID()));
2680 case Instruction::Store:
2681 if (cast<StoreInst>(I).isAtomic())
2682 Code = bitc::FUNC_CODE_INST_STOREATOMIC;
2684 Code = bitc::FUNC_CODE_INST_STORE;
2685 pushValueAndType(I.getOperand(1), InstID, Vals); // ptrty + ptr
2686 pushValueAndType(I.getOperand(0), InstID, Vals); // valty + val
2687 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
2688 Vals.push_back(cast<StoreInst>(I).isVolatile());
2689 if (cast<StoreInst>(I).isAtomic()) {
2690 Vals.push_back(getEncodedOrdering(cast<StoreInst>(I).getOrdering()));
2692 getEncodedSyncScopeID(cast<StoreInst>(I).getSyncScopeID()));
2695 case Instruction::AtomicCmpXchg:
2696 Code = bitc::FUNC_CODE_INST_CMPXCHG;
2697 pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
2698 pushValueAndType(I.getOperand(1), InstID, Vals); // cmp.
2699 pushValue(I.getOperand(2), InstID, Vals); // newval.
2700 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile());
2702 getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getSuccessOrdering()));
2704 getEncodedSyncScopeID(cast<AtomicCmpXchgInst>(I).getSyncScopeID()));
2706 getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getFailureOrdering()));
2707 Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak());
2709 case Instruction::AtomicRMW:
2710 Code = bitc::FUNC_CODE_INST_ATOMICRMW;
2711 pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
2712 pushValue(I.getOperand(1), InstID, Vals); // val.
2714 getEncodedRMWOperation(cast<AtomicRMWInst>(I).getOperation()));
2715 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile());
2716 Vals.push_back(getEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering()));
2718 getEncodedSyncScopeID(cast<AtomicRMWInst>(I).getSyncScopeID()));
2720 case Instruction::Fence:
2721 Code = bitc::FUNC_CODE_INST_FENCE;
2722 Vals.push_back(getEncodedOrdering(cast<FenceInst>(I).getOrdering()));
2723 Vals.push_back(getEncodedSyncScopeID(cast<FenceInst>(I).getSyncScopeID()));
2725 case Instruction::Call: {
2726 const CallInst &CI = cast<CallInst>(I);
2727 FunctionType *FTy = CI.getFunctionType();
2729 if (CI.hasOperandBundles())
2730 writeOperandBundles(&CI, InstID);
2732 Code = bitc::FUNC_CODE_INST_CALL;
2734 Vals.push_back(VE.getAttributeListID(CI.getAttributes()));
2736 unsigned Flags = getOptimizationFlags(&I);
2737 Vals.push_back(CI.getCallingConv() << bitc::CALL_CCONV |
2738 unsigned(CI.isTailCall()) << bitc::CALL_TAIL |
2739 unsigned(CI.isMustTailCall()) << bitc::CALL_MUSTTAIL |
2740 1 << bitc::CALL_EXPLICIT_TYPE |
2741 unsigned(CI.isNoTailCall()) << bitc::CALL_NOTAIL |
2742 unsigned(Flags != 0) << bitc::CALL_FMF);
2744 Vals.push_back(Flags);
2746 Vals.push_back(VE.getTypeID(FTy));
2747 pushValueAndType(CI.getCalledValue(), InstID, Vals); // Callee
2749 // Emit value #'s for the fixed parameters.
2750 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) {
2751 // Check for labels (can happen with asm labels).
2752 if (FTy->getParamType(i)->isLabelTy())
2753 Vals.push_back(VE.getValueID(CI.getArgOperand(i)));
2755 pushValue(CI.getArgOperand(i), InstID, Vals); // fixed param.
2758 // Emit type/value pairs for varargs params.
2759 if (FTy->isVarArg()) {
2760 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
2762 pushValueAndType(CI.getArgOperand(i), InstID, Vals); // varargs
2766 case Instruction::VAArg:
2767 Code = bitc::FUNC_CODE_INST_VAARG;
2768 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
2769 pushValue(I.getOperand(0), InstID, Vals); // valist.
2770 Vals.push_back(VE.getTypeID(I.getType())); // restype.
2774 Stream.EmitRecord(Code, Vals, AbbrevToUse);
2778 /// Write a GlobalValue VST to the module. The purpose of this data structure is
2779 /// to allow clients to efficiently find the function body.
2780 void ModuleBitcodeWriter::writeGlobalValueSymbolTable(
2781 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
2782 // Get the offset of the VST we are writing, and backpatch it into
2783 // the VST forward declaration record.
2784 uint64_t VSTOffset = Stream.GetCurrentBitNo();
2785 // The BitcodeStartBit was the stream offset of the identification block.
2786 VSTOffset -= bitcodeStartBit();
2787 assert((VSTOffset & 31) == 0 && "VST block not 32-bit aligned");
2788 // Note that we add 1 here because the offset is relative to one word
2789 // before the start of the identification block, which was historically
2790 // always the start of the regular bitcode header.
2791 Stream.BackpatchWord(VSTOffsetPlaceholder, VSTOffset / 32 + 1);
2793 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
2795 auto Abbv = std::make_shared<BitCodeAbbrev>();
2796 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_FNENTRY));
2797 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
2798 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset
2799 unsigned FnEntryAbbrev = Stream.EmitAbbrev(std::move(Abbv));
2801 for (const Function &F : M) {
2804 if (F.isDeclaration())
2807 Record[0] = VE.getValueID(&F);
2809 // Save the word offset of the function (from the start of the
2810 // actual bitcode written to the stream).
2811 uint64_t BitcodeIndex = FunctionToBitcodeIndex[&F] - bitcodeStartBit();
2812 assert((BitcodeIndex & 31) == 0 && "function block not 32-bit aligned");
2813 // Note that we add 1 here because the offset is relative to one word
2814 // before the start of the identification block, which was historically
2815 // always the start of the regular bitcode header.
2816 Record[1] = BitcodeIndex / 32 + 1;
2818 Stream.EmitRecord(bitc::VST_CODE_FNENTRY, Record, FnEntryAbbrev);
2824 /// Emit names for arguments, instructions and basic blocks in a function.
2825 void ModuleBitcodeWriter::writeFunctionLevelValueSymbolTable(
2826 const ValueSymbolTable &VST) {
2830 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
2832 // FIXME: Set up the abbrev, we know how many values there are!
2833 // FIXME: We know if the type names can use 7-bit ascii.
2834 SmallVector<uint64_t, 64> NameVals;
2836 for (const ValueName &Name : VST) {
2837 // Figure out the encoding to use for the name.
2838 StringEncoding Bits = getStringEncoding(Name.getKey());
2840 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
2841 NameVals.push_back(VE.getValueID(Name.getValue()));
2843 // VST_CODE_ENTRY: [valueid, namechar x N]
2844 // VST_CODE_BBENTRY: [bbid, namechar x N]
2846 if (isa<BasicBlock>(Name.getValue())) {
2847 Code = bitc::VST_CODE_BBENTRY;
2848 if (Bits == SE_Char6)
2849 AbbrevToUse = VST_BBENTRY_6_ABBREV;
2851 Code = bitc::VST_CODE_ENTRY;
2852 if (Bits == SE_Char6)
2853 AbbrevToUse = VST_ENTRY_6_ABBREV;
2854 else if (Bits == SE_Fixed7)
2855 AbbrevToUse = VST_ENTRY_7_ABBREV;
2858 for (const auto P : Name.getKey())
2859 NameVals.push_back((unsigned char)P);
2861 // Emit the finished record.
2862 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
2869 void ModuleBitcodeWriter::writeUseList(UseListOrder &&Order) {
2870 assert(Order.Shuffle.size() >= 2 && "Shuffle too small");
2872 if (isa<BasicBlock>(Order.V))
2873 Code = bitc::USELIST_CODE_BB;
2875 Code = bitc::USELIST_CODE_DEFAULT;
2877 SmallVector<uint64_t, 64> Record(Order.Shuffle.begin(), Order.Shuffle.end());
2878 Record.push_back(VE.getValueID(Order.V));
2879 Stream.EmitRecord(Code, Record);
2882 void ModuleBitcodeWriter::writeUseListBlock(const Function *F) {
2883 assert(VE.shouldPreserveUseListOrder() &&
2884 "Expected to be preserving use-list order");
2886 auto hasMore = [&]() {
2887 return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
2893 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
2895 writeUseList(std::move(VE.UseListOrders.back()));
2896 VE.UseListOrders.pop_back();
2901 /// Emit a function body to the module stream.
2902 void ModuleBitcodeWriter::writeFunction(
2904 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
2905 // Save the bitcode index of the start of this function block for recording
2907 FunctionToBitcodeIndex[&F] = Stream.GetCurrentBitNo();
2909 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
2910 VE.incorporateFunction(F);
2912 SmallVector<unsigned, 64> Vals;
2914 // Emit the number of basic blocks, so the reader can create them ahead of
2916 Vals.push_back(VE.getBasicBlocks().size());
2917 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
2920 // If there are function-local constants, emit them now.
2921 unsigned CstStart, CstEnd;
2922 VE.getFunctionConstantRange(CstStart, CstEnd);
2923 writeConstants(CstStart, CstEnd, false);
2925 // If there is function-local metadata, emit it now.
2926 writeFunctionMetadata(F);
2928 // Keep a running idea of what the instruction ID is.
2929 unsigned InstID = CstEnd;
2931 bool NeedsMetadataAttachment = F.hasMetadata();
2933 DILocation *LastDL = nullptr;
2934 // Finally, emit all the instructions, in order.
2935 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2936 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
2938 writeInstruction(*I, InstID, Vals);
2940 if (!I->getType()->isVoidTy())
2943 // If the instruction has metadata, write a metadata attachment later.
2944 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
2946 // If the instruction has a debug location, emit it.
2947 DILocation *DL = I->getDebugLoc();
2952 // Just repeat the same debug loc as last time.
2953 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
2957 Vals.push_back(DL->getLine());
2958 Vals.push_back(DL->getColumn());
2959 Vals.push_back(VE.getMetadataOrNullID(DL->getScope()));
2960 Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt()));
2961 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
2967 // Emit names for all the instructions etc.
2968 if (auto *Symtab = F.getValueSymbolTable())
2969 writeFunctionLevelValueSymbolTable(*Symtab);
2971 if (NeedsMetadataAttachment)
2972 writeFunctionMetadataAttachment(F);
2973 if (VE.shouldPreserveUseListOrder())
2974 writeUseListBlock(&F);
2979 // Emit blockinfo, which defines the standard abbreviations etc.
2980 void ModuleBitcodeWriter::writeBlockInfo() {
2981 // We only want to emit block info records for blocks that have multiple
2982 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK.
2983 // Other blocks can define their abbrevs inline.
2984 Stream.EnterBlockInfoBlock();
2986 { // 8-bit fixed-width VST_CODE_ENTRY/VST_CODE_BBENTRY strings.
2987 auto Abbv = std::make_shared<BitCodeAbbrev>();
2988 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
2989 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
2990 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2991 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
2992 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
2994 llvm_unreachable("Unexpected abbrev ordering!");
2997 { // 7-bit fixed width VST_CODE_ENTRY strings.
2998 auto Abbv = std::make_shared<BitCodeAbbrev>();
2999 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
3000 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3001 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3002 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
3003 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
3005 llvm_unreachable("Unexpected abbrev ordering!");
3007 { // 6-bit char6 VST_CODE_ENTRY strings.
3008 auto Abbv = std::make_shared<BitCodeAbbrev>();
3009 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
3010 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3011 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3012 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3013 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
3015 llvm_unreachable("Unexpected abbrev ordering!");
3017 { // 6-bit char6 VST_CODE_BBENTRY strings.
3018 auto Abbv = std::make_shared<BitCodeAbbrev>();
3019 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
3020 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3021 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3022 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3023 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
3024 VST_BBENTRY_6_ABBREV)
3025 llvm_unreachable("Unexpected abbrev ordering!");
3030 { // SETTYPE abbrev for CONSTANTS_BLOCK.
3031 auto Abbv = std::make_shared<BitCodeAbbrev>();
3032 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
3033 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
3034 VE.computeBitsRequiredForTypeIndicies()));
3035 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3036 CONSTANTS_SETTYPE_ABBREV)
3037 llvm_unreachable("Unexpected abbrev ordering!");
3040 { // INTEGER abbrev for CONSTANTS_BLOCK.
3041 auto Abbv = std::make_shared<BitCodeAbbrev>();
3042 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
3043 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3044 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3045 CONSTANTS_INTEGER_ABBREV)
3046 llvm_unreachable("Unexpected abbrev ordering!");
3049 { // CE_CAST abbrev for CONSTANTS_BLOCK.
3050 auto Abbv = std::make_shared<BitCodeAbbrev>();
3051 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
3052 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
3053 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
3054 VE.computeBitsRequiredForTypeIndicies()));
3055 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
3057 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3058 CONSTANTS_CE_CAST_Abbrev)
3059 llvm_unreachable("Unexpected abbrev ordering!");
3061 { // NULL abbrev for CONSTANTS_BLOCK.
3062 auto Abbv = std::make_shared<BitCodeAbbrev>();
3063 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
3064 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3065 CONSTANTS_NULL_Abbrev)
3066 llvm_unreachable("Unexpected abbrev ordering!");
3069 // FIXME: This should only use space for first class types!
3071 { // INST_LOAD abbrev for FUNCTION_BLOCK.
3072 auto Abbv = std::make_shared<BitCodeAbbrev>();
3073 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
3074 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
3075 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3076 VE.computeBitsRequiredForTypeIndicies()));
3077 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
3078 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
3079 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3080 FUNCTION_INST_LOAD_ABBREV)
3081 llvm_unreachable("Unexpected abbrev ordering!");
3083 { // INST_BINOP abbrev for FUNCTION_BLOCK.
3084 auto Abbv = std::make_shared<BitCodeAbbrev>();
3085 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
3086 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3087 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
3088 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3089 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3090 FUNCTION_INST_BINOP_ABBREV)
3091 llvm_unreachable("Unexpected abbrev ordering!");
3093 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
3094 auto Abbv = std::make_shared<BitCodeAbbrev>();
3095 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
3096 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3097 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
3098 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3099 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
3100 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3101 FUNCTION_INST_BINOP_FLAGS_ABBREV)
3102 llvm_unreachable("Unexpected abbrev ordering!");
3104 { // INST_CAST abbrev for FUNCTION_BLOCK.
3105 auto Abbv = std::make_shared<BitCodeAbbrev>();
3106 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
3107 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
3108 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3109 VE.computeBitsRequiredForTypeIndicies()));
3110 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3111 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3112 FUNCTION_INST_CAST_ABBREV)
3113 llvm_unreachable("Unexpected abbrev ordering!");
3116 { // INST_RET abbrev for FUNCTION_BLOCK.
3117 auto Abbv = std::make_shared<BitCodeAbbrev>();
3118 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
3119 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3120 FUNCTION_INST_RET_VOID_ABBREV)
3121 llvm_unreachable("Unexpected abbrev ordering!");
3123 { // INST_RET abbrev for FUNCTION_BLOCK.
3124 auto Abbv = std::make_shared<BitCodeAbbrev>();
3125 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
3126 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
3127 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3128 FUNCTION_INST_RET_VAL_ABBREV)
3129 llvm_unreachable("Unexpected abbrev ordering!");
3131 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
3132 auto Abbv = std::make_shared<BitCodeAbbrev>();
3133 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
3134 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3135 FUNCTION_INST_UNREACHABLE_ABBREV)
3136 llvm_unreachable("Unexpected abbrev ordering!");
3139 auto Abbv = std::make_shared<BitCodeAbbrev>();
3140 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_GEP));
3141 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
3142 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3143 Log2_32_Ceil(VE.getTypes().size() + 1)));
3144 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3145 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
3146 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3147 FUNCTION_INST_GEP_ABBREV)
3148 llvm_unreachable("Unexpected abbrev ordering!");
3154 /// Write the module path strings, currently only used when generating
3155 /// a combined index file.
3156 void IndexBitcodeWriter::writeModStrings() {
3157 Stream.EnterSubblock(bitc::MODULE_STRTAB_BLOCK_ID, 3);
3159 // TODO: See which abbrev sizes we actually need to emit
3161 // 8-bit fixed-width MST_ENTRY strings.
3162 auto Abbv = std::make_shared<BitCodeAbbrev>();
3163 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3164 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3165 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3166 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
3167 unsigned Abbrev8Bit = Stream.EmitAbbrev(std::move(Abbv));
3169 // 7-bit fixed width MST_ENTRY strings.
3170 Abbv = std::make_shared<BitCodeAbbrev>();
3171 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3172 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3173 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3174 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
3175 unsigned Abbrev7Bit = Stream.EmitAbbrev(std::move(Abbv));
3177 // 6-bit char6 MST_ENTRY strings.
3178 Abbv = std::make_shared<BitCodeAbbrev>();
3179 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3181 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3182 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3183 unsigned Abbrev6Bit = Stream.EmitAbbrev(std::move(Abbv));
3185 // Module Hash, 160 bits SHA1. Optionally, emitted after each MST_CODE_ENTRY.
3186 Abbv = std::make_shared<BitCodeAbbrev>();
3187 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_HASH));
3188 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3189 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3190 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3191 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3192 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3193 unsigned AbbrevHash = Stream.EmitAbbrev(std::move(Abbv));
3195 SmallVector<unsigned, 64> Vals;
3197 [&](const StringMapEntry<std::pair<uint64_t, ModuleHash>> &MPSE) {
3198 StringRef Key = MPSE.getKey();
3199 const auto &Value = MPSE.getValue();
3200 StringEncoding Bits = getStringEncoding(Key);
3201 unsigned AbbrevToUse = Abbrev8Bit;
3202 if (Bits == SE_Char6)
3203 AbbrevToUse = Abbrev6Bit;
3204 else if (Bits == SE_Fixed7)
3205 AbbrevToUse = Abbrev7Bit;
3207 Vals.push_back(Value.first);
3208 Vals.append(Key.begin(), Key.end());
3210 // Emit the finished record.
3211 Stream.EmitRecord(bitc::MST_CODE_ENTRY, Vals, AbbrevToUse);
3213 // Emit an optional hash for the module now
3214 const auto &Hash = Value.second;
3215 if (llvm::any_of(Hash, [](uint32_t H) { return H; })) {
3216 Vals.assign(Hash.begin(), Hash.end());
3217 // Emit the hash record.
3218 Stream.EmitRecord(bitc::MST_CODE_HASH, Vals, AbbrevHash);
3226 /// Write the function type metadata related records that need to appear before
3227 /// a function summary entry (whether per-module or combined).
3228 static void writeFunctionTypeMetadataRecords(BitstreamWriter &Stream,
3229 FunctionSummary *FS) {
3230 if (!FS->type_tests().empty())
3231 Stream.EmitRecord(bitc::FS_TYPE_TESTS, FS->type_tests());
3233 SmallVector<uint64_t, 64> Record;
3235 auto WriteVFuncIdVec = [&](uint64_t Ty,
3236 ArrayRef<FunctionSummary::VFuncId> VFs) {
3240 for (auto &VF : VFs) {
3241 Record.push_back(VF.GUID);
3242 Record.push_back(VF.Offset);
3244 Stream.EmitRecord(Ty, Record);
3247 WriteVFuncIdVec(bitc::FS_TYPE_TEST_ASSUME_VCALLS,
3248 FS->type_test_assume_vcalls());
3249 WriteVFuncIdVec(bitc::FS_TYPE_CHECKED_LOAD_VCALLS,
3250 FS->type_checked_load_vcalls());
3252 auto WriteConstVCallVec = [&](uint64_t Ty,
3253 ArrayRef<FunctionSummary::ConstVCall> VCs) {
3254 for (auto &VC : VCs) {
3256 Record.push_back(VC.VFunc.GUID);
3257 Record.push_back(VC.VFunc.Offset);
3258 Record.insert(Record.end(), VC.Args.begin(), VC.Args.end());
3259 Stream.EmitRecord(Ty, Record);
3263 WriteConstVCallVec(bitc::FS_TYPE_TEST_ASSUME_CONST_VCALL,
3264 FS->type_test_assume_const_vcalls());
3265 WriteConstVCallVec(bitc::FS_TYPE_CHECKED_LOAD_CONST_VCALL,
3266 FS->type_checked_load_const_vcalls());
3269 // Helper to emit a single function summary record.
3270 void ModuleBitcodeWriter::writePerModuleFunctionSummaryRecord(
3271 SmallVector<uint64_t, 64> &NameVals, GlobalValueSummary *Summary,
3272 unsigned ValueID, unsigned FSCallsAbbrev, unsigned FSCallsProfileAbbrev,
3273 const Function &F) {
3274 NameVals.push_back(ValueID);
3276 FunctionSummary *FS = cast<FunctionSummary>(Summary);
3277 writeFunctionTypeMetadataRecords(Stream, FS);
3279 NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
3280 NameVals.push_back(FS->instCount());
3281 NameVals.push_back(FS->refs().size());
3283 for (auto &RI : FS->refs())
3284 NameVals.push_back(VE.getValueID(RI.getValue()));
3286 bool HasProfileData = F.getEntryCount().hasValue();
3287 for (auto &ECI : FS->calls()) {
3288 NameVals.push_back(getValueId(ECI.first));
3290 NameVals.push_back(static_cast<uint8_t>(ECI.second.Hotness));
3293 unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
3295 (HasProfileData ? bitc::FS_PERMODULE_PROFILE : bitc::FS_PERMODULE);
3297 // Emit the finished record.
3298 Stream.EmitRecord(Code, NameVals, FSAbbrev);
3302 // Collect the global value references in the given variable's initializer,
3303 // and emit them in a summary record.
3304 void ModuleBitcodeWriter::writeModuleLevelReferences(
3305 const GlobalVariable &V, SmallVector<uint64_t, 64> &NameVals,
3306 unsigned FSModRefsAbbrev) {
3307 auto VI = Index->getValueInfo(GlobalValue::getGUID(V.getName()));
3308 if (!VI || VI.getSummaryList().empty()) {
3309 // Only declarations should not have a summary (a declaration might however
3310 // have a summary if the def was in module level asm).
3311 assert(V.isDeclaration());
3314 auto *Summary = VI.getSummaryList()[0].get();
3315 NameVals.push_back(VE.getValueID(&V));
3316 GlobalVarSummary *VS = cast<GlobalVarSummary>(Summary);
3317 NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
3319 unsigned SizeBeforeRefs = NameVals.size();
3320 for (auto &RI : VS->refs())
3321 NameVals.push_back(VE.getValueID(RI.getValue()));
3322 // Sort the refs for determinism output, the vector returned by FS->refs() has
3323 // been initialized from a DenseSet.
3324 std::sort(NameVals.begin() + SizeBeforeRefs, NameVals.end());
3326 Stream.EmitRecord(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS, NameVals,
3331 // Current version for the summary.
3332 // This is bumped whenever we introduce changes in the way some record are
3333 // interpreted, like flags for instance.
3334 static const uint64_t INDEX_VERSION = 3;
3336 /// Emit the per-module summary section alongside the rest of
3337 /// the module's bitcode.
3338 void ModuleBitcodeWriter::writePerModuleGlobalValueSummary() {
3339 // By default we compile with ThinLTO if the module has a summary, but the
3340 // client can request full LTO with a module flag.
3341 bool IsThinLTO = true;
3343 mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("ThinLTO")))
3344 IsThinLTO = MD->getZExtValue();
3345 Stream.EnterSubblock(IsThinLTO ? bitc::GLOBALVAL_SUMMARY_BLOCK_ID
3346 : bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID,
3349 Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
3351 if (Index->begin() == Index->end()) {
3356 for (const auto &GVI : valueIds()) {
3357 Stream.EmitRecord(bitc::FS_VALUE_GUID,
3358 ArrayRef<uint64_t>{GVI.second, GVI.first});
3361 // Abbrev for FS_PERMODULE.
3362 auto Abbv = std::make_shared<BitCodeAbbrev>();
3363 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE));
3364 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3365 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3366 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3367 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3368 // numrefs x valueid, n x (valueid)
3369 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3370 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3371 unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3373 // Abbrev for FS_PERMODULE_PROFILE.
3374 Abbv = std::make_shared<BitCodeAbbrev>();
3375 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_PROFILE));
3376 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3377 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3379 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3380 // numrefs x valueid, n x (valueid, hotness)
3381 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3382 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3383 unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3385 // Abbrev for FS_PERMODULE_GLOBALVAR_INIT_REFS.
3386 Abbv = std::make_shared<BitCodeAbbrev>();
3387 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS));
3388 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3389 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3390 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); // valueids
3391 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3392 unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3394 // Abbrev for FS_ALIAS.
3395 Abbv = std::make_shared<BitCodeAbbrev>();
3396 Abbv->Add(BitCodeAbbrevOp(bitc::FS_ALIAS));
3397 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3398 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3399 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3400 unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3402 SmallVector<uint64_t, 64> NameVals;
3403 // Iterate over the list of functions instead of the Index to
3404 // ensure the ordering is stable.
3405 for (const Function &F : M) {
3406 // Summary emission does not support anonymous functions, they have to
3407 // renamed using the anonymous function renaming pass.
3409 report_fatal_error("Unexpected anonymous function when writing summary");
3411 ValueInfo VI = Index->getValueInfo(GlobalValue::getGUID(F.getName()));
3412 if (!VI || VI.getSummaryList().empty()) {
3413 // Only declarations should not have a summary (a declaration might
3414 // however have a summary if the def was in module level asm).
3415 assert(F.isDeclaration());
3418 auto *Summary = VI.getSummaryList()[0].get();
3419 writePerModuleFunctionSummaryRecord(NameVals, Summary, VE.getValueID(&F),
3420 FSCallsAbbrev, FSCallsProfileAbbrev, F);
3423 // Capture references from GlobalVariable initializers, which are outside
3424 // of a function scope.
3425 for (const GlobalVariable &G : M.globals())
3426 writeModuleLevelReferences(G, NameVals, FSModRefsAbbrev);
3428 for (const GlobalAlias &A : M.aliases()) {
3429 auto *Aliasee = A.getBaseObject();
3430 if (!Aliasee->hasName())
3431 // Nameless function don't have an entry in the summary, skip it.
3433 auto AliasId = VE.getValueID(&A);
3434 auto AliaseeId = VE.getValueID(Aliasee);
3435 NameVals.push_back(AliasId);
3436 auto *Summary = Index->getGlobalValueSummary(A);
3437 AliasSummary *AS = cast<AliasSummary>(Summary);
3438 NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
3439 NameVals.push_back(AliaseeId);
3440 Stream.EmitRecord(bitc::FS_ALIAS, NameVals, FSAliasAbbrev);
3447 /// Emit the combined summary section into the combined index file.
3448 void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
3449 Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
3450 Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
3452 for (const auto &GVI : valueIds()) {
3453 Stream.EmitRecord(bitc::FS_VALUE_GUID,
3454 ArrayRef<uint64_t>{GVI.second, GVI.first});
3457 // Abbrev for FS_COMBINED.
3458 auto Abbv = std::make_shared<BitCodeAbbrev>();
3459 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED));
3460 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3461 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3462 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3463 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3464 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3465 // numrefs x valueid, n x (valueid)
3466 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3467 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3468 unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3470 // Abbrev for FS_COMBINED_PROFILE.
3471 Abbv = std::make_shared<BitCodeAbbrev>();
3472 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_PROFILE));
3473 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3474 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3475 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3476 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3477 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3478 // numrefs x valueid, n x (valueid, hotness)
3479 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3480 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3481 unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3483 // Abbrev for FS_COMBINED_GLOBALVAR_INIT_REFS.
3484 Abbv = std::make_shared<BitCodeAbbrev>();
3485 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS));
3486 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3487 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3488 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3489 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); // valueids
3490 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3491 unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3493 // Abbrev for FS_COMBINED_ALIAS.
3494 Abbv = std::make_shared<BitCodeAbbrev>();
3495 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_ALIAS));
3496 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3497 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3498 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3499 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3500 unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3502 // The aliases are emitted as a post-pass, and will point to the value
3503 // id of the aliasee. Save them in a vector for post-processing.
3504 SmallVector<AliasSummary *, 64> Aliases;
3506 // Save the value id for each summary for alias emission.
3507 DenseMap<const GlobalValueSummary *, unsigned> SummaryToValueIdMap;
3509 SmallVector<uint64_t, 64> NameVals;
3511 // For local linkage, we also emit the original name separately
3512 // immediately after the record.
3513 auto MaybeEmitOriginalName = [&](GlobalValueSummary &S) {
3514 if (!GlobalValue::isLocalLinkage(S.linkage()))
3516 NameVals.push_back(S.getOriginalName());
3517 Stream.EmitRecord(bitc::FS_COMBINED_ORIGINAL_NAME, NameVals);
3521 forEachSummary([&](GVInfo I) {
3522 GlobalValueSummary *S = I.second;
3525 auto ValueId = getValueId(I.first);
3527 SummaryToValueIdMap[S] = *ValueId;
3529 if (auto *AS = dyn_cast<AliasSummary>(S)) {
3530 // Will process aliases as a post-pass because the reader wants all
3531 // global to be loaded first.
3532 Aliases.push_back(AS);
3536 if (auto *VS = dyn_cast<GlobalVarSummary>(S)) {
3537 NameVals.push_back(*ValueId);
3538 NameVals.push_back(Index.getModuleId(VS->modulePath()));
3539 NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
3540 for (auto &RI : VS->refs()) {
3541 auto RefValueId = getValueId(RI.getGUID());
3544 NameVals.push_back(*RefValueId);
3547 // Emit the finished record.
3548 Stream.EmitRecord(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS, NameVals,
3551 MaybeEmitOriginalName(*S);
3555 auto *FS = cast<FunctionSummary>(S);
3556 writeFunctionTypeMetadataRecords(Stream, FS);
3558 NameVals.push_back(*ValueId);
3559 NameVals.push_back(Index.getModuleId(FS->modulePath()));
3560 NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
3561 NameVals.push_back(FS->instCount());
3563 NameVals.push_back(0);
3566 for (auto &RI : FS->refs()) {
3567 auto RefValueId = getValueId(RI.getGUID());
3570 NameVals.push_back(*RefValueId);
3573 NameVals[4] = Count;
3575 bool HasProfileData = false;
3576 for (auto &EI : FS->calls()) {
3577 HasProfileData |= EI.second.Hotness != CalleeInfo::HotnessType::Unknown;
3582 for (auto &EI : FS->calls()) {
3583 // If this GUID doesn't have a value id, it doesn't have a function
3584 // summary and we don't need to record any calls to it.
3585 GlobalValue::GUID GUID = EI.first.getGUID();
3586 auto CallValueId = getValueId(GUID);
3588 // For SamplePGO, the indirect call targets for local functions will
3589 // have its original name annotated in profile. We try to find the
3590 // corresponding PGOFuncName as the GUID.
3591 GUID = Index.getGUIDFromOriginalID(GUID);
3594 CallValueId = getValueId(GUID);
3598 NameVals.push_back(*CallValueId);
3600 NameVals.push_back(static_cast<uint8_t>(EI.second.Hotness));
3603 unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
3605 (HasProfileData ? bitc::FS_COMBINED_PROFILE : bitc::FS_COMBINED);
3607 // Emit the finished record.
3608 Stream.EmitRecord(Code, NameVals, FSAbbrev);
3610 MaybeEmitOriginalName(*S);
3613 for (auto *AS : Aliases) {
3614 auto AliasValueId = SummaryToValueIdMap[AS];
3615 assert(AliasValueId);
3616 NameVals.push_back(AliasValueId);
3617 NameVals.push_back(Index.getModuleId(AS->modulePath()));
3618 NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
3619 auto AliaseeValueId = SummaryToValueIdMap[&AS->getAliasee()];
3620 assert(AliaseeValueId);
3621 NameVals.push_back(AliaseeValueId);
3623 // Emit the finished record.
3624 Stream.EmitRecord(bitc::FS_COMBINED_ALIAS, NameVals, FSAliasAbbrev);
3626 MaybeEmitOriginalName(*AS);
3629 if (!Index.cfiFunctionDefs().empty()) {
3630 for (auto &S : Index.cfiFunctionDefs()) {
3631 NameVals.push_back(StrtabBuilder.add(S));
3632 NameVals.push_back(S.size());
3634 Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DEFS, NameVals);
3638 if (!Index.cfiFunctionDecls().empty()) {
3639 for (auto &S : Index.cfiFunctionDecls()) {
3640 NameVals.push_back(StrtabBuilder.add(S));
3641 NameVals.push_back(S.size());
3643 Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DECLS, NameVals);
3650 /// Create the "IDENTIFICATION_BLOCK_ID" containing a single string with the
3651 /// current llvm version, and a record for the epoch number.
3652 static void writeIdentificationBlock(BitstreamWriter &Stream) {
3653 Stream.EnterSubblock(bitc::IDENTIFICATION_BLOCK_ID, 5);
3655 // Write the "user readable" string identifying the bitcode producer
3656 auto Abbv = std::make_shared<BitCodeAbbrev>();
3657 Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_STRING));
3658 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3659 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3660 auto StringAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3661 writeStringRecord(Stream, bitc::IDENTIFICATION_CODE_STRING,
3662 "LLVM" LLVM_VERSION_STRING, StringAbbrev);
3664 // Write the epoch version
3665 Abbv = std::make_shared<BitCodeAbbrev>();
3666 Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_EPOCH));
3667 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
3668 auto EpochAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3669 SmallVector<unsigned, 1> Vals = {bitc::BITCODE_CURRENT_EPOCH};
3670 Stream.EmitRecord(bitc::IDENTIFICATION_CODE_EPOCH, Vals, EpochAbbrev);
3674 void ModuleBitcodeWriter::writeModuleHash(size_t BlockStartPos) {
3675 // Emit the module's hash.
3676 // MODULE_CODE_HASH: [5*i32]
3679 Hasher.update(ArrayRef<uint8_t>((const uint8_t *)&(Buffer)[BlockStartPos],
3680 Buffer.size() - BlockStartPos));
3681 StringRef Hash = Hasher.result();
3682 for (int Pos = 0; Pos < 20; Pos += 4) {
3683 Vals[Pos / 4] = support::endian::read32be(Hash.data() + Pos);
3686 // Emit the finished record.
3687 Stream.EmitRecord(bitc::MODULE_CODE_HASH, Vals);
3690 // Save the written hash value.
3691 std::copy(std::begin(Vals), std::end(Vals), std::begin(*ModHash));
3693 Stream.EmitRecord(bitc::MODULE_CODE_HASH, ArrayRef<uint32_t>(*ModHash));
3696 void ModuleBitcodeWriter::write() {
3697 writeIdentificationBlock(Stream);
3699 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
3700 size_t BlockStartPos = Buffer.size();
3702 writeModuleVersion();
3704 // Emit blockinfo, which defines the standard abbreviations etc.
3707 // Emit information about attribute groups.
3708 writeAttributeGroupTable();
3710 // Emit information about parameter attributes.
3711 writeAttributeTable();
3713 // Emit information describing all of the types in the module.
3718 // Emit top-level description of module, including target triple, inline asm,
3719 // descriptors for global variables, and function prototype info.
3723 writeModuleConstants();
3725 // Emit metadata kind names.
3726 writeModuleMetadataKinds();
3729 writeModuleMetadata();
3731 // Emit module-level use-lists.
3732 if (VE.shouldPreserveUseListOrder())
3733 writeUseListBlock(nullptr);
3735 writeOperandBundleTags();
3736 writeSyncScopeNames();
3738 // Emit function bodies.
3739 DenseMap<const Function *, uint64_t> FunctionToBitcodeIndex;
3740 for (Module::const_iterator F = M.begin(), E = M.end(); F != E; ++F)
3741 if (!F->isDeclaration())
3742 writeFunction(*F, FunctionToBitcodeIndex);
3744 // Need to write after the above call to WriteFunction which populates
3745 // the summary information in the index.
3747 writePerModuleGlobalValueSummary();
3749 writeGlobalValueSymbolTable(FunctionToBitcodeIndex);
3751 writeModuleHash(BlockStartPos);
3756 static void writeInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
3757 uint32_t &Position) {
3758 support::endian::write32le(&Buffer[Position], Value);
3762 /// If generating a bc file on darwin, we have to emit a
3763 /// header and trailer to make it compatible with the system archiver. To do
3764 /// this we emit the following header, and then emit a trailer that pads the
3765 /// file out to be a multiple of 16 bytes.
3767 /// struct bc_header {
3768 /// uint32_t Magic; // 0x0B17C0DE
3769 /// uint32_t Version; // Version, currently always 0.
3770 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
3771 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
3772 /// uint32_t CPUType; // CPU specifier.
3773 /// ... potentially more later ...
3775 static void emitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
3777 unsigned CPUType = ~0U;
3779 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
3780 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
3781 // number from /usr/include/mach/machine.h. It is ok to reproduce the
3782 // specific constants here because they are implicitly part of the Darwin ABI.
3784 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
3785 DARWIN_CPU_TYPE_X86 = 7,
3786 DARWIN_CPU_TYPE_ARM = 12,
3787 DARWIN_CPU_TYPE_POWERPC = 18
3790 Triple::ArchType Arch = TT.getArch();
3791 if (Arch == Triple::x86_64)
3792 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
3793 else if (Arch == Triple::x86)
3794 CPUType = DARWIN_CPU_TYPE_X86;
3795 else if (Arch == Triple::ppc)
3796 CPUType = DARWIN_CPU_TYPE_POWERPC;
3797 else if (Arch == Triple::ppc64)
3798 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
3799 else if (Arch == Triple::arm || Arch == Triple::thumb)
3800 CPUType = DARWIN_CPU_TYPE_ARM;
3802 // Traditional Bitcode starts after header.
3803 assert(Buffer.size() >= BWH_HeaderSize &&
3804 "Expected header size to be reserved");
3805 unsigned BCOffset = BWH_HeaderSize;
3806 unsigned BCSize = Buffer.size() - BWH_HeaderSize;
3808 // Write the magic and version.
3809 unsigned Position = 0;
3810 writeInt32ToBuffer(0x0B17C0DE, Buffer, Position);
3811 writeInt32ToBuffer(0, Buffer, Position); // Version.
3812 writeInt32ToBuffer(BCOffset, Buffer, Position);
3813 writeInt32ToBuffer(BCSize, Buffer, Position);
3814 writeInt32ToBuffer(CPUType, Buffer, Position);
3816 // If the file is not a multiple of 16 bytes, insert dummy padding.
3817 while (Buffer.size() & 15)
3818 Buffer.push_back(0);
3821 /// Helper to write the header common to all bitcode files.
3822 static void writeBitcodeHeader(BitstreamWriter &Stream) {
3823 // Emit the file header.
3824 Stream.Emit((unsigned)'B', 8);
3825 Stream.Emit((unsigned)'C', 8);
3826 Stream.Emit(0x0, 4);
3827 Stream.Emit(0xC, 4);
3828 Stream.Emit(0xE, 4);
3829 Stream.Emit(0xD, 4);
3832 BitcodeWriter::BitcodeWriter(SmallVectorImpl<char> &Buffer)
3833 : Buffer(Buffer), Stream(new BitstreamWriter(Buffer)) {
3834 writeBitcodeHeader(*Stream);
3837 BitcodeWriter::~BitcodeWriter() { assert(WroteStrtab); }
3839 void BitcodeWriter::writeBlob(unsigned Block, unsigned Record, StringRef Blob) {
3840 Stream->EnterSubblock(Block, 3);
3842 auto Abbv = std::make_shared<BitCodeAbbrev>();
3843 Abbv->Add(BitCodeAbbrevOp(Record));
3844 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3845 auto AbbrevNo = Stream->EmitAbbrev(std::move(Abbv));
3847 Stream->EmitRecordWithBlob(AbbrevNo, ArrayRef<uint64_t>{Record}, Blob);
3849 Stream->ExitBlock();
3852 void BitcodeWriter::writeSymtab() {
3853 assert(!WroteStrtab && !WroteSymtab);
3855 // If any module has module-level inline asm, we will require a registered asm
3856 // parser for the target so that we can create an accurate symbol table for
3858 for (Module *M : Mods) {
3859 if (M->getModuleInlineAsm().empty())
3863 const Triple TT(M->getTargetTriple());
3864 const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
3865 if (!T || !T->hasMCAsmParser())
3870 SmallVector<char, 0> Symtab;
3871 // The irsymtab::build function may be unable to create a symbol table if the
3872 // module is malformed (e.g. it contains an invalid alias). Writing a symbol
3873 // table is not required for correctness, but we still want to be able to
3874 // write malformed modules to bitcode files, so swallow the error.
3875 if (Error E = irsymtab::build(Mods, Symtab, StrtabBuilder, Alloc)) {
3876 consumeError(std::move(E));
3880 writeBlob(bitc::SYMTAB_BLOCK_ID, bitc::SYMTAB_BLOB,
3881 {Symtab.data(), Symtab.size()});
3884 void BitcodeWriter::writeStrtab() {
3885 assert(!WroteStrtab);
3887 std::vector<char> Strtab;
3888 StrtabBuilder.finalizeInOrder();
3889 Strtab.resize(StrtabBuilder.getSize());
3890 StrtabBuilder.write((uint8_t *)Strtab.data());
3892 writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB,
3893 {Strtab.data(), Strtab.size()});
3898 void BitcodeWriter::copyStrtab(StringRef Strtab) {
3899 writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB, Strtab);
3903 void BitcodeWriter::writeModule(const Module *M,
3904 bool ShouldPreserveUseListOrder,
3905 const ModuleSummaryIndex *Index,
3906 bool GenerateHash, ModuleHash *ModHash) {
3907 assert(!WroteStrtab);
3909 // The Mods vector is used by irsymtab::build, which requires non-const
3910 // Modules in case it needs to materialize metadata. But the bitcode writer
3911 // requires that the module is materialized, so we can cast to non-const here,
3912 // after checking that it is in fact materialized.
3913 assert(M->isMaterialized());
3914 Mods.push_back(const_cast<Module *>(M));
3916 ModuleBitcodeWriter ModuleWriter(M, Buffer, StrtabBuilder, *Stream,
3917 ShouldPreserveUseListOrder, Index,
3918 GenerateHash, ModHash);
3919 ModuleWriter.write();
3922 void BitcodeWriter::writeIndex(
3923 const ModuleSummaryIndex *Index,
3924 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) {
3925 IndexBitcodeWriter IndexWriter(*Stream, StrtabBuilder, *Index,
3926 ModuleToSummariesForIndex);
3927 IndexWriter.write();
3930 /// WriteBitcodeToFile - Write the specified module to the specified output
3932 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out,
3933 bool ShouldPreserveUseListOrder,
3934 const ModuleSummaryIndex *Index,
3935 bool GenerateHash, ModuleHash *ModHash) {
3936 SmallVector<char, 0> Buffer;
3937 Buffer.reserve(256*1024);
3939 // If this is darwin or another generic macho target, reserve space for the
3941 Triple TT(M->getTargetTriple());
3942 if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
3943 Buffer.insert(Buffer.begin(), BWH_HeaderSize, 0);
3945 BitcodeWriter Writer(Buffer);
3946 Writer.writeModule(M, ShouldPreserveUseListOrder, Index, GenerateHash,
3948 Writer.writeSymtab();
3949 Writer.writeStrtab();
3951 if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
3952 emitDarwinBCHeaderAndTrailer(Buffer, TT);
3954 // Write the generated bitstream to "Out".
3955 Out.write((char*)&Buffer.front(), Buffer.size());
3958 void IndexBitcodeWriter::write() {
3959 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
3961 writeModuleVersion();
3963 // Write the module paths in the combined index.
3966 // Write the summary combined index records.
3967 writeCombinedGlobalValueSummary();
3972 // Write the specified module summary index to the given raw output stream,
3973 // where it will be written in a new bitcode block. This is used when
3974 // writing the combined index file for ThinLTO. When writing a subset of the
3975 // index for a distributed backend, provide a \p ModuleToSummariesForIndex map.
3976 void llvm::WriteIndexToFile(
3977 const ModuleSummaryIndex &Index, raw_ostream &Out,
3978 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) {
3979 SmallVector<char, 0> Buffer;
3980 Buffer.reserve(256 * 1024);
3982 BitcodeWriter Writer(Buffer);
3983 Writer.writeIndex(&Index, ModuleToSummariesForIndex);
3984 Writer.writeStrtab();
3986 Out.write((char *)&Buffer.front(), Buffer.size());