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/Support/ErrorHandling.h"
33 #include "llvm/Support/MathExtras.h"
34 #include "llvm/Support/Program.h"
35 #include "llvm/Support/SHA1.h"
36 #include "llvm/Support/raw_ostream.h"
44 IndexThreshold("bitcode-mdindex-threshold", cl::Hidden, cl::init(25),
45 cl::desc("Number of metadatas above which we emit an index "
46 "to enable lazy-loading"));
47 /// These are manifest constants used by the bitcode writer. They do not need to
48 /// be kept in sync with the reader, but need to be consistent within this file.
50 // VALUE_SYMTAB_BLOCK abbrev id's.
51 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
56 // CONSTANTS_BLOCK abbrev id's.
57 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
58 CONSTANTS_INTEGER_ABBREV,
59 CONSTANTS_CE_CAST_Abbrev,
60 CONSTANTS_NULL_Abbrev,
62 // FUNCTION_BLOCK abbrev id's.
63 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
64 FUNCTION_INST_BINOP_ABBREV,
65 FUNCTION_INST_BINOP_FLAGS_ABBREV,
66 FUNCTION_INST_CAST_ABBREV,
67 FUNCTION_INST_RET_VOID_ABBREV,
68 FUNCTION_INST_RET_VAL_ABBREV,
69 FUNCTION_INST_UNREACHABLE_ABBREV,
70 FUNCTION_INST_GEP_ABBREV,
73 /// Abstract class to manage the bitcode writing, subclassed for each bitcode
75 class BitcodeWriterBase {
77 /// The stream created and owned by the client.
78 BitstreamWriter &Stream;
81 /// Constructs a BitcodeWriterBase object that writes to the provided
83 BitcodeWriterBase(BitstreamWriter &Stream) : Stream(Stream) {}
86 void writeBitcodeHeader();
87 void writeModuleVersion();
90 void BitcodeWriterBase::writeModuleVersion() {
91 // VERSION: [version#]
92 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, ArrayRef<uint64_t>{2});
95 /// Class to manage the bitcode writing for a module.
96 class ModuleBitcodeWriter : public BitcodeWriterBase {
97 /// Pointer to the buffer allocated by caller for bitcode writing.
98 const SmallVectorImpl<char> &Buffer;
100 StringTableBuilder &StrtabBuilder;
102 /// The Module to write to bitcode.
105 /// Enumerates ids for all values in the module.
108 /// Optional per-module index to write for ThinLTO.
109 const ModuleSummaryIndex *Index;
111 /// True if a module hash record should be written.
114 /// If non-null, when GenerateHash is true, the resulting hash is written
115 /// into ModHash. When GenerateHash is false, that specified value
116 /// is used as the hash instead of computing from the generated bitcode.
117 /// Can be used to produce the same module hash for a minimized bitcode
118 /// used just for the thin link as in the regular full bitcode that will
119 /// be used in the backend.
122 /// The start bit of the identification block.
123 uint64_t BitcodeStartBit;
125 /// Map that holds the correspondence between GUIDs in the summary index,
126 /// that came from indirect call profiles, and a value id generated by this
127 /// class to use in the VST and summary block records.
128 std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
130 /// Tracks the last value id recorded in the GUIDToValueMap.
131 unsigned GlobalValueId;
133 /// Saves the offset of the VSTOffset record that must eventually be
134 /// backpatched with the offset of the actual VST.
135 uint64_t VSTOffsetPlaceholder = 0;
138 /// Constructs a ModuleBitcodeWriter object for the given Module,
139 /// writing to the provided \p Buffer.
140 ModuleBitcodeWriter(const Module *M, SmallVectorImpl<char> &Buffer,
141 StringTableBuilder &StrtabBuilder,
142 BitstreamWriter &Stream, bool ShouldPreserveUseListOrder,
143 const ModuleSummaryIndex *Index, bool GenerateHash,
144 ModuleHash *ModHash = nullptr)
145 : BitcodeWriterBase(Stream), Buffer(Buffer), StrtabBuilder(StrtabBuilder),
146 M(*M), VE(*M, ShouldPreserveUseListOrder), Index(Index),
147 GenerateHash(GenerateHash), ModHash(ModHash),
148 BitcodeStartBit(Stream.GetCurrentBitNo()) {
149 // Assign ValueIds to any callee values in the index that came from
150 // indirect call profiles and were recorded as a GUID not a Value*
151 // (which would have been assigned an ID by the ValueEnumerator).
152 // The starting ValueId is just after the number of values in the
153 // ValueEnumerator, so that they can be emitted in the VST.
154 GlobalValueId = VE.getValues().size();
157 for (const auto &GUIDSummaryLists : *Index)
158 // Examine all summaries for this GUID.
159 for (auto &Summary : GUIDSummaryLists.second.SummaryList)
160 if (auto FS = dyn_cast<FunctionSummary>(Summary.get()))
161 // For each call in the function summary, see if the call
162 // is to a GUID (which means it is for an indirect call,
163 // otherwise we would have a Value for it). If so, synthesize
165 for (auto &CallEdge : FS->calls())
166 if (!CallEdge.first.getValue())
167 assignValueId(CallEdge.first.getGUID());
170 /// Emit the current module to the bitstream.
174 uint64_t bitcodeStartBit() { return BitcodeStartBit; }
176 void writeAttributeGroupTable();
177 void writeAttributeTable();
178 void writeTypeTable();
180 void writeValueSymbolTableForwardDecl();
181 void writeModuleInfo();
182 void writeValueAsMetadata(const ValueAsMetadata *MD,
183 SmallVectorImpl<uint64_t> &Record);
184 void writeMDTuple(const MDTuple *N, SmallVectorImpl<uint64_t> &Record,
186 unsigned createDILocationAbbrev();
187 void writeDILocation(const DILocation *N, SmallVectorImpl<uint64_t> &Record,
189 unsigned createGenericDINodeAbbrev();
190 void writeGenericDINode(const GenericDINode *N,
191 SmallVectorImpl<uint64_t> &Record, unsigned &Abbrev);
192 void writeDISubrange(const DISubrange *N, SmallVectorImpl<uint64_t> &Record,
194 void writeDIEnumerator(const DIEnumerator *N,
195 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
196 void writeDIBasicType(const DIBasicType *N, SmallVectorImpl<uint64_t> &Record,
198 void writeDIDerivedType(const DIDerivedType *N,
199 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
200 void writeDICompositeType(const DICompositeType *N,
201 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
202 void writeDISubroutineType(const DISubroutineType *N,
203 SmallVectorImpl<uint64_t> &Record,
205 void writeDIFile(const DIFile *N, SmallVectorImpl<uint64_t> &Record,
207 void writeDICompileUnit(const DICompileUnit *N,
208 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
209 void writeDISubprogram(const DISubprogram *N,
210 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
211 void writeDILexicalBlock(const DILexicalBlock *N,
212 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
213 void writeDILexicalBlockFile(const DILexicalBlockFile *N,
214 SmallVectorImpl<uint64_t> &Record,
216 void writeDINamespace(const DINamespace *N, SmallVectorImpl<uint64_t> &Record,
218 void writeDIMacro(const DIMacro *N, SmallVectorImpl<uint64_t> &Record,
220 void writeDIMacroFile(const DIMacroFile *N, SmallVectorImpl<uint64_t> &Record,
222 void writeDIModule(const DIModule *N, SmallVectorImpl<uint64_t> &Record,
224 void writeDITemplateTypeParameter(const DITemplateTypeParameter *N,
225 SmallVectorImpl<uint64_t> &Record,
227 void writeDITemplateValueParameter(const DITemplateValueParameter *N,
228 SmallVectorImpl<uint64_t> &Record,
230 void writeDIGlobalVariable(const DIGlobalVariable *N,
231 SmallVectorImpl<uint64_t> &Record,
233 void writeDILocalVariable(const DILocalVariable *N,
234 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
235 void writeDIExpression(const DIExpression *N,
236 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
237 void writeDIGlobalVariableExpression(const DIGlobalVariableExpression *N,
238 SmallVectorImpl<uint64_t> &Record,
240 void writeDIObjCProperty(const DIObjCProperty *N,
241 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
242 void writeDIImportedEntity(const DIImportedEntity *N,
243 SmallVectorImpl<uint64_t> &Record,
245 unsigned createNamedMetadataAbbrev();
246 void writeNamedMetadata(SmallVectorImpl<uint64_t> &Record);
247 unsigned createMetadataStringsAbbrev();
248 void writeMetadataStrings(ArrayRef<const Metadata *> Strings,
249 SmallVectorImpl<uint64_t> &Record);
250 void writeMetadataRecords(ArrayRef<const Metadata *> MDs,
251 SmallVectorImpl<uint64_t> &Record,
252 std::vector<unsigned> *MDAbbrevs = nullptr,
253 std::vector<uint64_t> *IndexPos = nullptr);
254 void writeModuleMetadata();
255 void writeFunctionMetadata(const Function &F);
256 void writeFunctionMetadataAttachment(const Function &F);
257 void writeGlobalVariableMetadataAttachment(const GlobalVariable &GV);
258 void pushGlobalMetadataAttachment(SmallVectorImpl<uint64_t> &Record,
259 const GlobalObject &GO);
260 void writeModuleMetadataKinds();
261 void writeOperandBundleTags();
262 void writeConstants(unsigned FirstVal, unsigned LastVal, bool isGlobal);
263 void writeModuleConstants();
264 bool pushValueAndType(const Value *V, unsigned InstID,
265 SmallVectorImpl<unsigned> &Vals);
266 void writeOperandBundles(ImmutableCallSite CS, unsigned InstID);
267 void pushValue(const Value *V, unsigned InstID,
268 SmallVectorImpl<unsigned> &Vals);
269 void pushValueSigned(const Value *V, unsigned InstID,
270 SmallVectorImpl<uint64_t> &Vals);
271 void writeInstruction(const Instruction &I, unsigned InstID,
272 SmallVectorImpl<unsigned> &Vals);
273 void writeFunctionLevelValueSymbolTable(const ValueSymbolTable &VST);
274 void writeGlobalValueSymbolTable(
275 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
276 void writeUseList(UseListOrder &&Order);
277 void writeUseListBlock(const Function *F);
279 writeFunction(const Function &F,
280 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
281 void writeBlockInfo();
282 void writePerModuleFunctionSummaryRecord(SmallVector<uint64_t, 64> &NameVals,
283 GlobalValueSummary *Summary,
285 unsigned FSCallsAbbrev,
286 unsigned FSCallsProfileAbbrev,
288 void writeModuleLevelReferences(const GlobalVariable &V,
289 SmallVector<uint64_t, 64> &NameVals,
290 unsigned FSModRefsAbbrev);
291 void writePerModuleGlobalValueSummary();
292 void writeModuleHash(size_t BlockStartPos);
294 void assignValueId(GlobalValue::GUID ValGUID) {
295 GUIDToValueIdMap[ValGUID] = ++GlobalValueId;
297 unsigned getValueId(GlobalValue::GUID ValGUID) {
298 const auto &VMI = GUIDToValueIdMap.find(ValGUID);
299 // Expect that any GUID value had a value Id assigned by an
300 // earlier call to assignValueId.
301 assert(VMI != GUIDToValueIdMap.end() &&
302 "GUID does not have assigned value Id");
305 // Helper to get the valueId for the type of value recorded in VI.
306 unsigned getValueId(ValueInfo VI) {
308 return getValueId(VI.getGUID());
309 return VE.getValueID(VI.getValue());
311 std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
314 /// Class to manage the bitcode writing for a combined index.
315 class IndexBitcodeWriter : public BitcodeWriterBase {
316 /// The combined index to write to bitcode.
317 const ModuleSummaryIndex &Index;
319 /// When writing a subset of the index for distributed backends, client
320 /// provides a map of modules to the corresponding GUIDs/summaries to write.
321 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex;
323 /// Map that holds the correspondence between the GUID used in the combined
324 /// index and a value id generated by this class to use in references.
325 std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
327 /// Tracks the last value id recorded in the GUIDToValueMap.
328 unsigned GlobalValueId = 0;
331 /// Constructs a IndexBitcodeWriter object for the given combined index,
332 /// writing to the provided \p Buffer. When writing a subset of the index
333 /// for a distributed backend, provide a \p ModuleToSummariesForIndex map.
334 IndexBitcodeWriter(BitstreamWriter &Stream, const ModuleSummaryIndex &Index,
335 const std::map<std::string, GVSummaryMapTy>
336 *ModuleToSummariesForIndex = nullptr)
337 : BitcodeWriterBase(Stream), Index(Index),
338 ModuleToSummariesForIndex(ModuleToSummariesForIndex) {
339 // Assign unique value ids to all summaries to be written, for use
340 // in writing out the call graph edges. Save the mapping from GUID
341 // to the new global value id to use when writing those edges, which
342 // are currently saved in the index in terms of GUID.
343 forEachSummary([&](GVInfo I) {
344 GUIDToValueIdMap[I.first] = ++GlobalValueId;
348 /// The below iterator returns the GUID and associated summary.
349 typedef std::pair<GlobalValue::GUID, GlobalValueSummary *> GVInfo;
351 /// Calls the callback for each value GUID and summary to be written to
352 /// bitcode. This hides the details of whether they are being pulled from the
353 /// entire index or just those in a provided ModuleToSummariesForIndex map.
354 void forEachSummary(std::function<void(GVInfo)> Callback) {
355 if (ModuleToSummariesForIndex) {
356 for (auto &M : *ModuleToSummariesForIndex)
357 for (auto &Summary : M.second)
360 for (auto &Summaries : Index)
361 for (auto &Summary : Summaries.second.SummaryList)
362 Callback({Summaries.first, Summary.get()});
366 /// Main entry point for writing a combined index to bitcode.
370 void writeModStrings();
371 void writeCombinedGlobalValueSummary();
373 /// Indicates whether the provided \p ModulePath should be written into
374 /// the module string table, e.g. if full index written or if it is in
375 /// the provided subset.
376 bool doIncludeModule(StringRef ModulePath) {
377 return !ModuleToSummariesForIndex ||
378 ModuleToSummariesForIndex->count(ModulePath);
381 bool hasValueId(GlobalValue::GUID ValGUID) {
382 const auto &VMI = GUIDToValueIdMap.find(ValGUID);
383 return VMI != GUIDToValueIdMap.end();
385 void assignValueId(GlobalValue::GUID ValGUID) {
386 unsigned &ValueId = GUIDToValueIdMap[ValGUID];
388 ValueId = ++GlobalValueId;
390 unsigned getValueId(GlobalValue::GUID ValGUID) {
391 auto VMI = GUIDToValueIdMap.find(ValGUID);
392 assert(VMI != GUIDToValueIdMap.end());
395 std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
397 } // end anonymous namespace
399 static unsigned getEncodedCastOpcode(unsigned Opcode) {
401 default: llvm_unreachable("Unknown cast instruction!");
402 case Instruction::Trunc : return bitc::CAST_TRUNC;
403 case Instruction::ZExt : return bitc::CAST_ZEXT;
404 case Instruction::SExt : return bitc::CAST_SEXT;
405 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
406 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
407 case Instruction::UIToFP : return bitc::CAST_UITOFP;
408 case Instruction::SIToFP : return bitc::CAST_SITOFP;
409 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
410 case Instruction::FPExt : return bitc::CAST_FPEXT;
411 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
412 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
413 case Instruction::BitCast : return bitc::CAST_BITCAST;
414 case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST;
418 static unsigned getEncodedBinaryOpcode(unsigned Opcode) {
420 default: llvm_unreachable("Unknown binary instruction!");
421 case Instruction::Add:
422 case Instruction::FAdd: return bitc::BINOP_ADD;
423 case Instruction::Sub:
424 case Instruction::FSub: return bitc::BINOP_SUB;
425 case Instruction::Mul:
426 case Instruction::FMul: return bitc::BINOP_MUL;
427 case Instruction::UDiv: return bitc::BINOP_UDIV;
428 case Instruction::FDiv:
429 case Instruction::SDiv: return bitc::BINOP_SDIV;
430 case Instruction::URem: return bitc::BINOP_UREM;
431 case Instruction::FRem:
432 case Instruction::SRem: return bitc::BINOP_SREM;
433 case Instruction::Shl: return bitc::BINOP_SHL;
434 case Instruction::LShr: return bitc::BINOP_LSHR;
435 case Instruction::AShr: return bitc::BINOP_ASHR;
436 case Instruction::And: return bitc::BINOP_AND;
437 case Instruction::Or: return bitc::BINOP_OR;
438 case Instruction::Xor: return bitc::BINOP_XOR;
442 static unsigned getEncodedRMWOperation(AtomicRMWInst::BinOp Op) {
444 default: llvm_unreachable("Unknown RMW operation!");
445 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG;
446 case AtomicRMWInst::Add: return bitc::RMW_ADD;
447 case AtomicRMWInst::Sub: return bitc::RMW_SUB;
448 case AtomicRMWInst::And: return bitc::RMW_AND;
449 case AtomicRMWInst::Nand: return bitc::RMW_NAND;
450 case AtomicRMWInst::Or: return bitc::RMW_OR;
451 case AtomicRMWInst::Xor: return bitc::RMW_XOR;
452 case AtomicRMWInst::Max: return bitc::RMW_MAX;
453 case AtomicRMWInst::Min: return bitc::RMW_MIN;
454 case AtomicRMWInst::UMax: return bitc::RMW_UMAX;
455 case AtomicRMWInst::UMin: return bitc::RMW_UMIN;
459 static unsigned getEncodedOrdering(AtomicOrdering Ordering) {
461 case AtomicOrdering::NotAtomic: return bitc::ORDERING_NOTATOMIC;
462 case AtomicOrdering::Unordered: return bitc::ORDERING_UNORDERED;
463 case AtomicOrdering::Monotonic: return bitc::ORDERING_MONOTONIC;
464 case AtomicOrdering::Acquire: return bitc::ORDERING_ACQUIRE;
465 case AtomicOrdering::Release: return bitc::ORDERING_RELEASE;
466 case AtomicOrdering::AcquireRelease: return bitc::ORDERING_ACQREL;
467 case AtomicOrdering::SequentiallyConsistent: return bitc::ORDERING_SEQCST;
469 llvm_unreachable("Invalid ordering");
472 static unsigned getEncodedSynchScope(SynchronizationScope SynchScope) {
473 switch (SynchScope) {
474 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD;
475 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD;
477 llvm_unreachable("Invalid synch scope");
480 static void writeStringRecord(BitstreamWriter &Stream, unsigned Code,
481 StringRef Str, unsigned AbbrevToUse) {
482 SmallVector<unsigned, 64> Vals;
484 // Code: [strchar x N]
485 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
486 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i]))
488 Vals.push_back(Str[i]);
491 // Emit the finished record.
492 Stream.EmitRecord(Code, Vals, AbbrevToUse);
495 static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
497 case Attribute::Alignment:
498 return bitc::ATTR_KIND_ALIGNMENT;
499 case Attribute::AllocSize:
500 return bitc::ATTR_KIND_ALLOC_SIZE;
501 case Attribute::AlwaysInline:
502 return bitc::ATTR_KIND_ALWAYS_INLINE;
503 case Attribute::ArgMemOnly:
504 return bitc::ATTR_KIND_ARGMEMONLY;
505 case Attribute::Builtin:
506 return bitc::ATTR_KIND_BUILTIN;
507 case Attribute::ByVal:
508 return bitc::ATTR_KIND_BY_VAL;
509 case Attribute::Convergent:
510 return bitc::ATTR_KIND_CONVERGENT;
511 case Attribute::InAlloca:
512 return bitc::ATTR_KIND_IN_ALLOCA;
513 case Attribute::Cold:
514 return bitc::ATTR_KIND_COLD;
515 case Attribute::InaccessibleMemOnly:
516 return bitc::ATTR_KIND_INACCESSIBLEMEM_ONLY;
517 case Attribute::InaccessibleMemOrArgMemOnly:
518 return bitc::ATTR_KIND_INACCESSIBLEMEM_OR_ARGMEMONLY;
519 case Attribute::InlineHint:
520 return bitc::ATTR_KIND_INLINE_HINT;
521 case Attribute::InReg:
522 return bitc::ATTR_KIND_IN_REG;
523 case Attribute::JumpTable:
524 return bitc::ATTR_KIND_JUMP_TABLE;
525 case Attribute::MinSize:
526 return bitc::ATTR_KIND_MIN_SIZE;
527 case Attribute::Naked:
528 return bitc::ATTR_KIND_NAKED;
529 case Attribute::Nest:
530 return bitc::ATTR_KIND_NEST;
531 case Attribute::NoAlias:
532 return bitc::ATTR_KIND_NO_ALIAS;
533 case Attribute::NoBuiltin:
534 return bitc::ATTR_KIND_NO_BUILTIN;
535 case Attribute::NoCapture:
536 return bitc::ATTR_KIND_NO_CAPTURE;
537 case Attribute::NoDuplicate:
538 return bitc::ATTR_KIND_NO_DUPLICATE;
539 case Attribute::NoImplicitFloat:
540 return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT;
541 case Attribute::NoInline:
542 return bitc::ATTR_KIND_NO_INLINE;
543 case Attribute::NoRecurse:
544 return bitc::ATTR_KIND_NO_RECURSE;
545 case Attribute::NonLazyBind:
546 return bitc::ATTR_KIND_NON_LAZY_BIND;
547 case Attribute::NonNull:
548 return bitc::ATTR_KIND_NON_NULL;
549 case Attribute::Dereferenceable:
550 return bitc::ATTR_KIND_DEREFERENCEABLE;
551 case Attribute::DereferenceableOrNull:
552 return bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL;
553 case Attribute::NoRedZone:
554 return bitc::ATTR_KIND_NO_RED_ZONE;
555 case Attribute::NoReturn:
556 return bitc::ATTR_KIND_NO_RETURN;
557 case Attribute::NoUnwind:
558 return bitc::ATTR_KIND_NO_UNWIND;
559 case Attribute::OptimizeForSize:
560 return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE;
561 case Attribute::OptimizeNone:
562 return bitc::ATTR_KIND_OPTIMIZE_NONE;
563 case Attribute::ReadNone:
564 return bitc::ATTR_KIND_READ_NONE;
565 case Attribute::ReadOnly:
566 return bitc::ATTR_KIND_READ_ONLY;
567 case Attribute::Returned:
568 return bitc::ATTR_KIND_RETURNED;
569 case Attribute::ReturnsTwice:
570 return bitc::ATTR_KIND_RETURNS_TWICE;
571 case Attribute::SExt:
572 return bitc::ATTR_KIND_S_EXT;
573 case Attribute::Speculatable:
574 return bitc::ATTR_KIND_SPECULATABLE;
575 case Attribute::StackAlignment:
576 return bitc::ATTR_KIND_STACK_ALIGNMENT;
577 case Attribute::StackProtect:
578 return bitc::ATTR_KIND_STACK_PROTECT;
579 case Attribute::StackProtectReq:
580 return bitc::ATTR_KIND_STACK_PROTECT_REQ;
581 case Attribute::StackProtectStrong:
582 return bitc::ATTR_KIND_STACK_PROTECT_STRONG;
583 case Attribute::SafeStack:
584 return bitc::ATTR_KIND_SAFESTACK;
585 case Attribute::StructRet:
586 return bitc::ATTR_KIND_STRUCT_RET;
587 case Attribute::SanitizeAddress:
588 return bitc::ATTR_KIND_SANITIZE_ADDRESS;
589 case Attribute::SanitizeThread:
590 return bitc::ATTR_KIND_SANITIZE_THREAD;
591 case Attribute::SanitizeMemory:
592 return bitc::ATTR_KIND_SANITIZE_MEMORY;
593 case Attribute::SwiftError:
594 return bitc::ATTR_KIND_SWIFT_ERROR;
595 case Attribute::SwiftSelf:
596 return bitc::ATTR_KIND_SWIFT_SELF;
597 case Attribute::UWTable:
598 return bitc::ATTR_KIND_UW_TABLE;
599 case Attribute::WriteOnly:
600 return bitc::ATTR_KIND_WRITEONLY;
601 case Attribute::ZExt:
602 return bitc::ATTR_KIND_Z_EXT;
603 case Attribute::EndAttrKinds:
604 llvm_unreachable("Can not encode end-attribute kinds marker.");
605 case Attribute::None:
606 llvm_unreachable("Can not encode none-attribute.");
609 llvm_unreachable("Trying to encode unknown attribute");
612 void ModuleBitcodeWriter::writeAttributeGroupTable() {
613 const std::vector<ValueEnumerator::IndexAndAttrSet> &AttrGrps =
614 VE.getAttributeGroups();
615 if (AttrGrps.empty()) return;
617 Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
619 SmallVector<uint64_t, 64> Record;
620 for (ValueEnumerator::IndexAndAttrSet Pair : AttrGrps) {
621 unsigned AttrListIndex = Pair.first;
622 AttributeSet AS = Pair.second;
623 Record.push_back(VE.getAttributeGroupID(Pair));
624 Record.push_back(AttrListIndex);
626 for (Attribute Attr : AS) {
627 if (Attr.isEnumAttribute()) {
629 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
630 } else if (Attr.isIntAttribute()) {
632 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
633 Record.push_back(Attr.getValueAsInt());
635 StringRef Kind = Attr.getKindAsString();
636 StringRef Val = Attr.getValueAsString();
638 Record.push_back(Val.empty() ? 3 : 4);
639 Record.append(Kind.begin(), Kind.end());
642 Record.append(Val.begin(), Val.end());
648 Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
655 void ModuleBitcodeWriter::writeAttributeTable() {
656 const std::vector<AttributeList> &Attrs = VE.getAttributeLists();
657 if (Attrs.empty()) return;
659 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
661 SmallVector<uint64_t, 64> Record;
662 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
663 AttributeList AL = Attrs[i];
664 for (unsigned i = AL.index_begin(), e = AL.index_end(); i != e; ++i) {
665 AttributeSet AS = AL.getAttributes(i);
666 if (AS.hasAttributes())
667 Record.push_back(VE.getAttributeGroupID({i, AS}));
670 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
677 /// WriteTypeTable - Write out the type table for a module.
678 void ModuleBitcodeWriter::writeTypeTable() {
679 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
681 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
682 SmallVector<uint64_t, 64> TypeVals;
684 uint64_t NumBits = VE.computeBitsRequiredForTypeIndicies();
686 // Abbrev for TYPE_CODE_POINTER.
687 auto Abbv = std::make_shared<BitCodeAbbrev>();
688 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
689 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
690 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
691 unsigned PtrAbbrev = Stream.EmitAbbrev(std::move(Abbv));
693 // Abbrev for TYPE_CODE_FUNCTION.
694 Abbv = std::make_shared<BitCodeAbbrev>();
695 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
696 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
697 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
698 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
700 unsigned FunctionAbbrev = Stream.EmitAbbrev(std::move(Abbv));
702 // Abbrev for TYPE_CODE_STRUCT_ANON.
703 Abbv = std::make_shared<BitCodeAbbrev>();
704 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON));
705 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
706 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
707 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
709 unsigned StructAnonAbbrev = Stream.EmitAbbrev(std::move(Abbv));
711 // Abbrev for TYPE_CODE_STRUCT_NAME.
712 Abbv = std::make_shared<BitCodeAbbrev>();
713 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
714 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
715 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
716 unsigned StructNameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
718 // Abbrev for TYPE_CODE_STRUCT_NAMED.
719 Abbv = std::make_shared<BitCodeAbbrev>();
720 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED));
721 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
722 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
723 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
725 unsigned StructNamedAbbrev = Stream.EmitAbbrev(std::move(Abbv));
727 // Abbrev for TYPE_CODE_ARRAY.
728 Abbv = std::make_shared<BitCodeAbbrev>();
729 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
730 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
731 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
733 unsigned ArrayAbbrev = Stream.EmitAbbrev(std::move(Abbv));
735 // Emit an entry count so the reader can reserve space.
736 TypeVals.push_back(TypeList.size());
737 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
740 // Loop over all of the types, emitting each in turn.
741 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
742 Type *T = TypeList[i];
746 switch (T->getTypeID()) {
747 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
748 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break;
749 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
750 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
751 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
752 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
753 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
754 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
755 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
756 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break;
757 case Type::TokenTyID: Code = bitc::TYPE_CODE_TOKEN; break;
758 case Type::IntegerTyID:
760 Code = bitc::TYPE_CODE_INTEGER;
761 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
763 case Type::PointerTyID: {
764 PointerType *PTy = cast<PointerType>(T);
765 // POINTER: [pointee type, address space]
766 Code = bitc::TYPE_CODE_POINTER;
767 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
768 unsigned AddressSpace = PTy->getAddressSpace();
769 TypeVals.push_back(AddressSpace);
770 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
773 case Type::FunctionTyID: {
774 FunctionType *FT = cast<FunctionType>(T);
775 // FUNCTION: [isvararg, retty, paramty x N]
776 Code = bitc::TYPE_CODE_FUNCTION;
777 TypeVals.push_back(FT->isVarArg());
778 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
779 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
780 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
781 AbbrevToUse = FunctionAbbrev;
784 case Type::StructTyID: {
785 StructType *ST = cast<StructType>(T);
786 // STRUCT: [ispacked, eltty x N]
787 TypeVals.push_back(ST->isPacked());
788 // Output all of the element types.
789 for (StructType::element_iterator I = ST->element_begin(),
790 E = ST->element_end(); I != E; ++I)
791 TypeVals.push_back(VE.getTypeID(*I));
793 if (ST->isLiteral()) {
794 Code = bitc::TYPE_CODE_STRUCT_ANON;
795 AbbrevToUse = StructAnonAbbrev;
797 if (ST->isOpaque()) {
798 Code = bitc::TYPE_CODE_OPAQUE;
800 Code = bitc::TYPE_CODE_STRUCT_NAMED;
801 AbbrevToUse = StructNamedAbbrev;
804 // Emit the name if it is present.
805 if (!ST->getName().empty())
806 writeStringRecord(Stream, bitc::TYPE_CODE_STRUCT_NAME, ST->getName(),
811 case Type::ArrayTyID: {
812 ArrayType *AT = cast<ArrayType>(T);
813 // ARRAY: [numelts, eltty]
814 Code = bitc::TYPE_CODE_ARRAY;
815 TypeVals.push_back(AT->getNumElements());
816 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
817 AbbrevToUse = ArrayAbbrev;
820 case Type::VectorTyID: {
821 VectorType *VT = cast<VectorType>(T);
822 // VECTOR [numelts, eltty]
823 Code = bitc::TYPE_CODE_VECTOR;
824 TypeVals.push_back(VT->getNumElements());
825 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
830 // Emit the finished record.
831 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
838 static unsigned getEncodedLinkage(const GlobalValue::LinkageTypes Linkage) {
840 case GlobalValue::ExternalLinkage:
842 case GlobalValue::WeakAnyLinkage:
844 case GlobalValue::AppendingLinkage:
846 case GlobalValue::InternalLinkage:
848 case GlobalValue::LinkOnceAnyLinkage:
850 case GlobalValue::ExternalWeakLinkage:
852 case GlobalValue::CommonLinkage:
854 case GlobalValue::PrivateLinkage:
856 case GlobalValue::WeakODRLinkage:
858 case GlobalValue::LinkOnceODRLinkage:
860 case GlobalValue::AvailableExternallyLinkage:
863 llvm_unreachable("Invalid linkage");
866 static unsigned getEncodedLinkage(const GlobalValue &GV) {
867 return getEncodedLinkage(GV.getLinkage());
870 // Decode the flags for GlobalValue in the summary
871 static uint64_t getEncodedGVSummaryFlags(GlobalValueSummary::GVFlags Flags) {
872 uint64_t RawFlags = 0;
874 RawFlags |= Flags.NotEligibleToImport; // bool
875 RawFlags |= (Flags.LiveRoot << 1);
876 // Linkage don't need to be remapped at that time for the summary. Any future
877 // change to the getEncodedLinkage() function will need to be taken into
878 // account here as well.
879 RawFlags = (RawFlags << 4) | Flags.Linkage; // 4 bits
884 static unsigned getEncodedVisibility(const GlobalValue &GV) {
885 switch (GV.getVisibility()) {
886 case GlobalValue::DefaultVisibility: return 0;
887 case GlobalValue::HiddenVisibility: return 1;
888 case GlobalValue::ProtectedVisibility: return 2;
890 llvm_unreachable("Invalid visibility");
893 static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) {
894 switch (GV.getDLLStorageClass()) {
895 case GlobalValue::DefaultStorageClass: return 0;
896 case GlobalValue::DLLImportStorageClass: return 1;
897 case GlobalValue::DLLExportStorageClass: return 2;
899 llvm_unreachable("Invalid DLL storage class");
902 static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) {
903 switch (GV.getThreadLocalMode()) {
904 case GlobalVariable::NotThreadLocal: return 0;
905 case GlobalVariable::GeneralDynamicTLSModel: return 1;
906 case GlobalVariable::LocalDynamicTLSModel: return 2;
907 case GlobalVariable::InitialExecTLSModel: return 3;
908 case GlobalVariable::LocalExecTLSModel: return 4;
910 llvm_unreachable("Invalid TLS model");
913 static unsigned getEncodedComdatSelectionKind(const Comdat &C) {
914 switch (C.getSelectionKind()) {
916 return bitc::COMDAT_SELECTION_KIND_ANY;
917 case Comdat::ExactMatch:
918 return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH;
919 case Comdat::Largest:
920 return bitc::COMDAT_SELECTION_KIND_LARGEST;
921 case Comdat::NoDuplicates:
922 return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES;
923 case Comdat::SameSize:
924 return bitc::COMDAT_SELECTION_KIND_SAME_SIZE;
926 llvm_unreachable("Invalid selection kind");
929 static unsigned getEncodedUnnamedAddr(const GlobalValue &GV) {
930 switch (GV.getUnnamedAddr()) {
931 case GlobalValue::UnnamedAddr::None: return 0;
932 case GlobalValue::UnnamedAddr::Local: return 2;
933 case GlobalValue::UnnamedAddr::Global: return 1;
935 llvm_unreachable("Invalid unnamed_addr");
938 void ModuleBitcodeWriter::writeComdats() {
939 SmallVector<unsigned, 64> Vals;
940 for (const Comdat *C : VE.getComdats()) {
941 // COMDAT: [strtab offset, strtab size, selection_kind]
942 Vals.push_back(StrtabBuilder.add(C->getName()));
943 Vals.push_back(C->getName().size());
944 Vals.push_back(getEncodedComdatSelectionKind(*C));
945 Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
950 /// Write a record that will eventually hold the word offset of the
951 /// module-level VST. For now the offset is 0, which will be backpatched
952 /// after the real VST is written. Saves the bit offset to backpatch.
953 void ModuleBitcodeWriter::writeValueSymbolTableForwardDecl() {
954 // Write a placeholder value in for the offset of the real VST,
955 // which is written after the function blocks so that it can include
956 // the offset of each function. The placeholder offset will be
957 // updated when the real VST is written.
958 auto Abbv = std::make_shared<BitCodeAbbrev>();
959 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_VSTOFFSET));
960 // Blocks are 32-bit aligned, so we can use a 32-bit word offset to
961 // hold the real VST offset. Must use fixed instead of VBR as we don't
962 // know how many VBR chunks to reserve ahead of time.
963 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
964 unsigned VSTOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
966 // Emit the placeholder
967 uint64_t Vals[] = {bitc::MODULE_CODE_VSTOFFSET, 0};
968 Stream.EmitRecordWithAbbrev(VSTOffsetAbbrev, Vals);
970 // Compute and save the bit offset to the placeholder, which will be
971 // patched when the real VST is written. We can simply subtract the 32-bit
972 // fixed size from the current bit number to get the location to backpatch.
973 VSTOffsetPlaceholder = Stream.GetCurrentBitNo() - 32;
976 enum StringEncoding { SE_Char6, SE_Fixed7, SE_Fixed8 };
978 /// Determine the encoding to use for the given string name and length.
979 static StringEncoding getStringEncoding(const char *Str, unsigned StrLen) {
981 for (const char *C = Str, *E = C + StrLen; C != E; ++C) {
983 isChar6 = BitCodeAbbrevOp::isChar6(*C);
984 if ((unsigned char)*C & 128)
985 // don't bother scanning the rest.
994 /// Emit top-level description of module, including target triple, inline asm,
995 /// descriptors for global variables, and function prototype info.
996 /// Returns the bit offset to backpatch with the location of the real VST.
997 void ModuleBitcodeWriter::writeModuleInfo() {
998 // Emit various pieces of data attached to a module.
999 if (!M.getTargetTriple().empty())
1000 writeStringRecord(Stream, bitc::MODULE_CODE_TRIPLE, M.getTargetTriple(),
1002 const std::string &DL = M.getDataLayoutStr();
1004 writeStringRecord(Stream, bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/);
1005 if (!M.getModuleInlineAsm().empty())
1006 writeStringRecord(Stream, bitc::MODULE_CODE_ASM, M.getModuleInlineAsm(),
1009 // Emit information about sections and GC, computing how many there are. Also
1010 // compute the maximum alignment value.
1011 std::map<std::string, unsigned> SectionMap;
1012 std::map<std::string, unsigned> GCMap;
1013 unsigned MaxAlignment = 0;
1014 unsigned MaxGlobalType = 0;
1015 for (const GlobalValue &GV : M.globals()) {
1016 MaxAlignment = std::max(MaxAlignment, GV.getAlignment());
1017 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getValueType()));
1018 if (GV.hasSection()) {
1019 // Give section names unique ID's.
1020 unsigned &Entry = SectionMap[GV.getSection()];
1022 writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, GV.getSection(),
1024 Entry = SectionMap.size();
1028 for (const Function &F : M) {
1029 MaxAlignment = std::max(MaxAlignment, F.getAlignment());
1030 if (F.hasSection()) {
1031 // Give section names unique ID's.
1032 unsigned &Entry = SectionMap[F.getSection()];
1034 writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, F.getSection(),
1036 Entry = SectionMap.size();
1040 // Same for GC names.
1041 unsigned &Entry = GCMap[F.getGC()];
1043 writeStringRecord(Stream, bitc::MODULE_CODE_GCNAME, F.getGC(),
1045 Entry = GCMap.size();
1050 // Emit abbrev for globals, now that we know # sections and max alignment.
1051 unsigned SimpleGVarAbbrev = 0;
1052 if (!M.global_empty()) {
1053 // Add an abbrev for common globals with no visibility or thread localness.
1054 auto Abbv = std::make_shared<BitCodeAbbrev>();
1055 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
1056 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1057 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1058 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1059 Log2_32_Ceil(MaxGlobalType+1)));
1060 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // AddrSpace << 2
1061 //| explicitType << 1
1063 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
1064 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage.
1065 if (MaxAlignment == 0) // Alignment.
1066 Abbv->Add(BitCodeAbbrevOp(0));
1068 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
1069 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1070 Log2_32_Ceil(MaxEncAlignment+1)));
1072 if (SectionMap.empty()) // Section.
1073 Abbv->Add(BitCodeAbbrevOp(0));
1075 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1076 Log2_32_Ceil(SectionMap.size()+1)));
1077 // Don't bother emitting vis + thread local.
1078 SimpleGVarAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1081 SmallVector<unsigned, 64> Vals;
1082 // Emit the module's source file name.
1084 StringEncoding Bits = getStringEncoding(M.getSourceFileName().data(),
1085 M.getSourceFileName().size());
1086 BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8);
1087 if (Bits == SE_Char6)
1088 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6);
1089 else if (Bits == SE_Fixed7)
1090 AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7);
1092 // MODULE_CODE_SOURCE_FILENAME: [namechar x N]
1093 auto Abbv = std::make_shared<BitCodeAbbrev>();
1094 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME));
1095 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1096 Abbv->Add(AbbrevOpToUse);
1097 unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1099 for (const auto P : M.getSourceFileName())
1100 Vals.push_back((unsigned char)P);
1102 // Emit the finished record.
1103 Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev);
1107 // Emit the global variable information.
1108 for (const GlobalVariable &GV : M.globals()) {
1109 unsigned AbbrevToUse = 0;
1111 // GLOBALVAR: [strtab offset, strtab size, type, isconst, initid,
1112 // linkage, alignment, section, visibility, threadlocal,
1113 // unnamed_addr, externally_initialized, dllstorageclass,
1114 // comdat, attributes]
1115 Vals.push_back(StrtabBuilder.add(GV.getName()));
1116 Vals.push_back(GV.getName().size());
1117 Vals.push_back(VE.getTypeID(GV.getValueType()));
1118 Vals.push_back(GV.getType()->getAddressSpace() << 2 | 2 | GV.isConstant());
1119 Vals.push_back(GV.isDeclaration() ? 0 :
1120 (VE.getValueID(GV.getInitializer()) + 1));
1121 Vals.push_back(getEncodedLinkage(GV));
1122 Vals.push_back(Log2_32(GV.getAlignment())+1);
1123 Vals.push_back(GV.hasSection() ? SectionMap[GV.getSection()] : 0);
1124 if (GV.isThreadLocal() ||
1125 GV.getVisibility() != GlobalValue::DefaultVisibility ||
1126 GV.getUnnamedAddr() != GlobalValue::UnnamedAddr::None ||
1127 GV.isExternallyInitialized() ||
1128 GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass ||
1130 GV.hasAttributes()) {
1131 Vals.push_back(getEncodedVisibility(GV));
1132 Vals.push_back(getEncodedThreadLocalMode(GV));
1133 Vals.push_back(getEncodedUnnamedAddr(GV));
1134 Vals.push_back(GV.isExternallyInitialized());
1135 Vals.push_back(getEncodedDLLStorageClass(GV));
1136 Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0);
1138 auto AL = GV.getAttributesAsList(AttributeList::FunctionIndex);
1139 Vals.push_back(VE.getAttributeListID(AL));
1141 AbbrevToUse = SimpleGVarAbbrev;
1144 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
1148 // Emit the function proto information.
1149 for (const Function &F : M) {
1150 // FUNCTION: [strtab offset, strtab size, type, callingconv, isproto,
1151 // linkage, paramattrs, alignment, section, visibility, gc,
1152 // unnamed_addr, prologuedata, dllstorageclass, comdat,
1153 // prefixdata, personalityfn]
1154 Vals.push_back(StrtabBuilder.add(F.getName()));
1155 Vals.push_back(F.getName().size());
1156 Vals.push_back(VE.getTypeID(F.getFunctionType()));
1157 Vals.push_back(F.getCallingConv());
1158 Vals.push_back(F.isDeclaration());
1159 Vals.push_back(getEncodedLinkage(F));
1160 Vals.push_back(VE.getAttributeListID(F.getAttributes()));
1161 Vals.push_back(Log2_32(F.getAlignment())+1);
1162 Vals.push_back(F.hasSection() ? SectionMap[F.getSection()] : 0);
1163 Vals.push_back(getEncodedVisibility(F));
1164 Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0);
1165 Vals.push_back(getEncodedUnnamedAddr(F));
1166 Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1)
1168 Vals.push_back(getEncodedDLLStorageClass(F));
1169 Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0);
1170 Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1)
1173 F.hasPersonalityFn() ? (VE.getValueID(F.getPersonalityFn()) + 1) : 0);
1175 unsigned AbbrevToUse = 0;
1176 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
1180 // Emit the alias information.
1181 for (const GlobalAlias &A : M.aliases()) {
1182 // ALIAS: [strtab offset, strtab size, alias type, aliasee val#, linkage,
1183 // visibility, dllstorageclass, threadlocal, unnamed_addr]
1184 Vals.push_back(StrtabBuilder.add(A.getName()));
1185 Vals.push_back(A.getName().size());
1186 Vals.push_back(VE.getTypeID(A.getValueType()));
1187 Vals.push_back(A.getType()->getAddressSpace());
1188 Vals.push_back(VE.getValueID(A.getAliasee()));
1189 Vals.push_back(getEncodedLinkage(A));
1190 Vals.push_back(getEncodedVisibility(A));
1191 Vals.push_back(getEncodedDLLStorageClass(A));
1192 Vals.push_back(getEncodedThreadLocalMode(A));
1193 Vals.push_back(getEncodedUnnamedAddr(A));
1194 unsigned AbbrevToUse = 0;
1195 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
1199 // Emit the ifunc information.
1200 for (const GlobalIFunc &I : M.ifuncs()) {
1201 // IFUNC: [strtab offset, strtab size, ifunc type, address space, resolver
1202 // val#, linkage, visibility]
1203 Vals.push_back(StrtabBuilder.add(I.getName()));
1204 Vals.push_back(I.getName().size());
1205 Vals.push_back(VE.getTypeID(I.getValueType()));
1206 Vals.push_back(I.getType()->getAddressSpace());
1207 Vals.push_back(VE.getValueID(I.getResolver()));
1208 Vals.push_back(getEncodedLinkage(I));
1209 Vals.push_back(getEncodedVisibility(I));
1210 Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
1214 writeValueSymbolTableForwardDecl();
1217 static uint64_t getOptimizationFlags(const Value *V) {
1220 if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) {
1221 if (OBO->hasNoSignedWrap())
1222 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
1223 if (OBO->hasNoUnsignedWrap())
1224 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
1225 } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) {
1227 Flags |= 1 << bitc::PEO_EXACT;
1228 } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) {
1229 if (FPMO->hasUnsafeAlgebra())
1230 Flags |= FastMathFlags::UnsafeAlgebra;
1231 if (FPMO->hasNoNaNs())
1232 Flags |= FastMathFlags::NoNaNs;
1233 if (FPMO->hasNoInfs())
1234 Flags |= FastMathFlags::NoInfs;
1235 if (FPMO->hasNoSignedZeros())
1236 Flags |= FastMathFlags::NoSignedZeros;
1237 if (FPMO->hasAllowReciprocal())
1238 Flags |= FastMathFlags::AllowReciprocal;
1239 if (FPMO->hasAllowContract())
1240 Flags |= FastMathFlags::AllowContract;
1246 void ModuleBitcodeWriter::writeValueAsMetadata(
1247 const ValueAsMetadata *MD, SmallVectorImpl<uint64_t> &Record) {
1248 // Mimic an MDNode with a value as one operand.
1249 Value *V = MD->getValue();
1250 Record.push_back(VE.getTypeID(V->getType()));
1251 Record.push_back(VE.getValueID(V));
1252 Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0);
1256 void ModuleBitcodeWriter::writeMDTuple(const MDTuple *N,
1257 SmallVectorImpl<uint64_t> &Record,
1259 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
1260 Metadata *MD = N->getOperand(i);
1261 assert(!(MD && isa<LocalAsMetadata>(MD)) &&
1262 "Unexpected function-local metadata");
1263 Record.push_back(VE.getMetadataOrNullID(MD));
1265 Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
1266 : bitc::METADATA_NODE,
1271 unsigned ModuleBitcodeWriter::createDILocationAbbrev() {
1272 // Assume the column is usually under 128, and always output the inlined-at
1273 // location (it's never more expensive than building an array size 1).
1274 auto Abbv = std::make_shared<BitCodeAbbrev>();
1275 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION));
1276 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1277 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1278 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1279 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1280 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1281 return Stream.EmitAbbrev(std::move(Abbv));
1284 void ModuleBitcodeWriter::writeDILocation(const DILocation *N,
1285 SmallVectorImpl<uint64_t> &Record,
1288 Abbrev = createDILocationAbbrev();
1290 Record.push_back(N->isDistinct());
1291 Record.push_back(N->getLine());
1292 Record.push_back(N->getColumn());
1293 Record.push_back(VE.getMetadataID(N->getScope()));
1294 Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt()));
1296 Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
1300 unsigned ModuleBitcodeWriter::createGenericDINodeAbbrev() {
1301 // Assume the column is usually under 128, and always output the inlined-at
1302 // location (it's never more expensive than building an array size 1).
1303 auto Abbv = std::make_shared<BitCodeAbbrev>();
1304 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG));
1305 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1306 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1307 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1308 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1309 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1310 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1311 return Stream.EmitAbbrev(std::move(Abbv));
1314 void ModuleBitcodeWriter::writeGenericDINode(const GenericDINode *N,
1315 SmallVectorImpl<uint64_t> &Record,
1318 Abbrev = createGenericDINodeAbbrev();
1320 Record.push_back(N->isDistinct());
1321 Record.push_back(N->getTag());
1322 Record.push_back(0); // Per-tag version field; unused for now.
1324 for (auto &I : N->operands())
1325 Record.push_back(VE.getMetadataOrNullID(I));
1327 Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev);
1331 static uint64_t rotateSign(int64_t I) {
1333 return I < 0 ? ~(U << 1) : U << 1;
1336 void ModuleBitcodeWriter::writeDISubrange(const DISubrange *N,
1337 SmallVectorImpl<uint64_t> &Record,
1339 Record.push_back(N->isDistinct());
1340 Record.push_back(N->getCount());
1341 Record.push_back(rotateSign(N->getLowerBound()));
1343 Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
1347 void ModuleBitcodeWriter::writeDIEnumerator(const DIEnumerator *N,
1348 SmallVectorImpl<uint64_t> &Record,
1350 Record.push_back(N->isDistinct());
1351 Record.push_back(rotateSign(N->getValue()));
1352 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1354 Stream.EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev);
1358 void ModuleBitcodeWriter::writeDIBasicType(const DIBasicType *N,
1359 SmallVectorImpl<uint64_t> &Record,
1361 Record.push_back(N->isDistinct());
1362 Record.push_back(N->getTag());
1363 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1364 Record.push_back(N->getSizeInBits());
1365 Record.push_back(N->getAlignInBits());
1366 Record.push_back(N->getEncoding());
1368 Stream.EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev);
1372 void ModuleBitcodeWriter::writeDIDerivedType(const DIDerivedType *N,
1373 SmallVectorImpl<uint64_t> &Record,
1375 Record.push_back(N->isDistinct());
1376 Record.push_back(N->getTag());
1377 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1378 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1379 Record.push_back(N->getLine());
1380 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1381 Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
1382 Record.push_back(N->getSizeInBits());
1383 Record.push_back(N->getAlignInBits());
1384 Record.push_back(N->getOffsetInBits());
1385 Record.push_back(N->getFlags());
1386 Record.push_back(VE.getMetadataOrNullID(N->getExtraData()));
1388 // DWARF address space is encoded as N->getDWARFAddressSpace() + 1. 0 means
1389 // that there is no DWARF address space associated with DIDerivedType.
1390 if (const auto &DWARFAddressSpace = N->getDWARFAddressSpace())
1391 Record.push_back(*DWARFAddressSpace + 1);
1393 Record.push_back(0);
1395 Stream.EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev);
1399 void ModuleBitcodeWriter::writeDICompositeType(
1400 const DICompositeType *N, SmallVectorImpl<uint64_t> &Record,
1402 const unsigned IsNotUsedInOldTypeRef = 0x2;
1403 Record.push_back(IsNotUsedInOldTypeRef | (unsigned)N->isDistinct());
1404 Record.push_back(N->getTag());
1405 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1406 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1407 Record.push_back(N->getLine());
1408 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1409 Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
1410 Record.push_back(N->getSizeInBits());
1411 Record.push_back(N->getAlignInBits());
1412 Record.push_back(N->getOffsetInBits());
1413 Record.push_back(N->getFlags());
1414 Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
1415 Record.push_back(N->getRuntimeLang());
1416 Record.push_back(VE.getMetadataOrNullID(N->getVTableHolder()));
1417 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
1418 Record.push_back(VE.getMetadataOrNullID(N->getRawIdentifier()));
1420 Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev);
1424 void ModuleBitcodeWriter::writeDISubroutineType(
1425 const DISubroutineType *N, SmallVectorImpl<uint64_t> &Record,
1427 const unsigned HasNoOldTypeRefs = 0x2;
1428 Record.push_back(HasNoOldTypeRefs | (unsigned)N->isDistinct());
1429 Record.push_back(N->getFlags());
1430 Record.push_back(VE.getMetadataOrNullID(N->getTypeArray().get()));
1431 Record.push_back(N->getCC());
1433 Stream.EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev);
1437 void ModuleBitcodeWriter::writeDIFile(const DIFile *N,
1438 SmallVectorImpl<uint64_t> &Record,
1440 Record.push_back(N->isDistinct());
1441 Record.push_back(VE.getMetadataOrNullID(N->getRawFilename()));
1442 Record.push_back(VE.getMetadataOrNullID(N->getRawDirectory()));
1443 Record.push_back(N->getChecksumKind());
1444 Record.push_back(VE.getMetadataOrNullID(N->getRawChecksum()));
1446 Stream.EmitRecord(bitc::METADATA_FILE, Record, Abbrev);
1450 void ModuleBitcodeWriter::writeDICompileUnit(const DICompileUnit *N,
1451 SmallVectorImpl<uint64_t> &Record,
1453 assert(N->isDistinct() && "Expected distinct compile units");
1454 Record.push_back(/* IsDistinct */ true);
1455 Record.push_back(N->getSourceLanguage());
1456 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1457 Record.push_back(VE.getMetadataOrNullID(N->getRawProducer()));
1458 Record.push_back(N->isOptimized());
1459 Record.push_back(VE.getMetadataOrNullID(N->getRawFlags()));
1460 Record.push_back(N->getRuntimeVersion());
1461 Record.push_back(VE.getMetadataOrNullID(N->getRawSplitDebugFilename()));
1462 Record.push_back(N->getEmissionKind());
1463 Record.push_back(VE.getMetadataOrNullID(N->getEnumTypes().get()));
1464 Record.push_back(VE.getMetadataOrNullID(N->getRetainedTypes().get()));
1465 Record.push_back(/* subprograms */ 0);
1466 Record.push_back(VE.getMetadataOrNullID(N->getGlobalVariables().get()));
1467 Record.push_back(VE.getMetadataOrNullID(N->getImportedEntities().get()));
1468 Record.push_back(N->getDWOId());
1469 Record.push_back(VE.getMetadataOrNullID(N->getMacros().get()));
1470 Record.push_back(N->getSplitDebugInlining());
1471 Record.push_back(N->getDebugInfoForProfiling());
1473 Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev);
1477 void ModuleBitcodeWriter::writeDISubprogram(const DISubprogram *N,
1478 SmallVectorImpl<uint64_t> &Record,
1480 uint64_t HasUnitFlag = 1 << 1;
1481 Record.push_back(N->isDistinct() | HasUnitFlag);
1482 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1483 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1484 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
1485 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1486 Record.push_back(N->getLine());
1487 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1488 Record.push_back(N->isLocalToUnit());
1489 Record.push_back(N->isDefinition());
1490 Record.push_back(N->getScopeLine());
1491 Record.push_back(VE.getMetadataOrNullID(N->getContainingType()));
1492 Record.push_back(N->getVirtuality());
1493 Record.push_back(N->getVirtualIndex());
1494 Record.push_back(N->getFlags());
1495 Record.push_back(N->isOptimized());
1496 Record.push_back(VE.getMetadataOrNullID(N->getRawUnit()));
1497 Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
1498 Record.push_back(VE.getMetadataOrNullID(N->getDeclaration()));
1499 Record.push_back(VE.getMetadataOrNullID(N->getVariables().get()));
1500 Record.push_back(N->getThisAdjustment());
1501 Record.push_back(VE.getMetadataOrNullID(N->getThrownTypes().get()));
1503 Stream.EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev);
1507 void ModuleBitcodeWriter::writeDILexicalBlock(const DILexicalBlock *N,
1508 SmallVectorImpl<uint64_t> &Record,
1510 Record.push_back(N->isDistinct());
1511 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1512 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1513 Record.push_back(N->getLine());
1514 Record.push_back(N->getColumn());
1516 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev);
1520 void ModuleBitcodeWriter::writeDILexicalBlockFile(
1521 const DILexicalBlockFile *N, SmallVectorImpl<uint64_t> &Record,
1523 Record.push_back(N->isDistinct());
1524 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1525 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1526 Record.push_back(N->getDiscriminator());
1528 Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev);
1532 void ModuleBitcodeWriter::writeDINamespace(const DINamespace *N,
1533 SmallVectorImpl<uint64_t> &Record,
1535 Record.push_back(N->isDistinct() | N->getExportSymbols() << 1);
1536 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1537 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1539 Stream.EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev);
1543 void ModuleBitcodeWriter::writeDIMacro(const DIMacro *N,
1544 SmallVectorImpl<uint64_t> &Record,
1546 Record.push_back(N->isDistinct());
1547 Record.push_back(N->getMacinfoType());
1548 Record.push_back(N->getLine());
1549 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1550 Record.push_back(VE.getMetadataOrNullID(N->getRawValue()));
1552 Stream.EmitRecord(bitc::METADATA_MACRO, Record, Abbrev);
1556 void ModuleBitcodeWriter::writeDIMacroFile(const DIMacroFile *N,
1557 SmallVectorImpl<uint64_t> &Record,
1559 Record.push_back(N->isDistinct());
1560 Record.push_back(N->getMacinfoType());
1561 Record.push_back(N->getLine());
1562 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1563 Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
1565 Stream.EmitRecord(bitc::METADATA_MACRO_FILE, Record, Abbrev);
1569 void ModuleBitcodeWriter::writeDIModule(const DIModule *N,
1570 SmallVectorImpl<uint64_t> &Record,
1572 Record.push_back(N->isDistinct());
1573 for (auto &I : N->operands())
1574 Record.push_back(VE.getMetadataOrNullID(I));
1576 Stream.EmitRecord(bitc::METADATA_MODULE, Record, Abbrev);
1580 void ModuleBitcodeWriter::writeDITemplateTypeParameter(
1581 const DITemplateTypeParameter *N, SmallVectorImpl<uint64_t> &Record,
1583 Record.push_back(N->isDistinct());
1584 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1585 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1587 Stream.EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev);
1591 void ModuleBitcodeWriter::writeDITemplateValueParameter(
1592 const DITemplateValueParameter *N, SmallVectorImpl<uint64_t> &Record,
1594 Record.push_back(N->isDistinct());
1595 Record.push_back(N->getTag());
1596 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1597 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1598 Record.push_back(VE.getMetadataOrNullID(N->getValue()));
1600 Stream.EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev);
1604 void ModuleBitcodeWriter::writeDIGlobalVariable(
1605 const DIGlobalVariable *N, SmallVectorImpl<uint64_t> &Record,
1607 const uint64_t Version = 1 << 1;
1608 Record.push_back((uint64_t)N->isDistinct() | Version);
1609 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1610 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1611 Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
1612 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1613 Record.push_back(N->getLine());
1614 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1615 Record.push_back(N->isLocalToUnit());
1616 Record.push_back(N->isDefinition());
1617 Record.push_back(/* expr */ 0);
1618 Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration()));
1619 Record.push_back(N->getAlignInBits());
1621 Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev);
1625 void ModuleBitcodeWriter::writeDILocalVariable(
1626 const DILocalVariable *N, SmallVectorImpl<uint64_t> &Record,
1628 // In order to support all possible bitcode formats in BitcodeReader we need
1629 // to distinguish the following cases:
1630 // 1) Record has no artificial tag (Record[1]),
1631 // has no obsolete inlinedAt field (Record[9]).
1632 // In this case Record size will be 8, HasAlignment flag is false.
1633 // 2) Record has artificial tag (Record[1]),
1634 // has no obsolete inlignedAt field (Record[9]).
1635 // In this case Record size will be 9, HasAlignment flag is false.
1636 // 3) Record has both artificial tag (Record[1]) and
1637 // obsolete inlignedAt field (Record[9]).
1638 // In this case Record size will be 10, HasAlignment flag is false.
1639 // 4) Record has neither artificial tag, nor inlignedAt field, but
1640 // HasAlignment flag is true and Record[8] contains alignment value.
1641 const uint64_t HasAlignmentFlag = 1 << 1;
1642 Record.push_back((uint64_t)N->isDistinct() | HasAlignmentFlag);
1643 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1644 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1645 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1646 Record.push_back(N->getLine());
1647 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1648 Record.push_back(N->getArg());
1649 Record.push_back(N->getFlags());
1650 Record.push_back(N->getAlignInBits());
1652 Stream.EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev);
1656 void ModuleBitcodeWriter::writeDIExpression(const DIExpression *N,
1657 SmallVectorImpl<uint64_t> &Record,
1659 Record.reserve(N->getElements().size() + 1);
1660 const uint64_t Version = 2 << 1;
1661 Record.push_back((uint64_t)N->isDistinct() | Version);
1662 Record.append(N->elements_begin(), N->elements_end());
1664 Stream.EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev);
1668 void ModuleBitcodeWriter::writeDIGlobalVariableExpression(
1669 const DIGlobalVariableExpression *N, SmallVectorImpl<uint64_t> &Record,
1671 Record.push_back(N->isDistinct());
1672 Record.push_back(VE.getMetadataOrNullID(N->getVariable()));
1673 Record.push_back(VE.getMetadataOrNullID(N->getExpression()));
1675 Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR_EXPR, Record, Abbrev);
1679 void ModuleBitcodeWriter::writeDIObjCProperty(const DIObjCProperty *N,
1680 SmallVectorImpl<uint64_t> &Record,
1682 Record.push_back(N->isDistinct());
1683 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1684 Record.push_back(VE.getMetadataOrNullID(N->getFile()));
1685 Record.push_back(N->getLine());
1686 Record.push_back(VE.getMetadataOrNullID(N->getRawSetterName()));
1687 Record.push_back(VE.getMetadataOrNullID(N->getRawGetterName()));
1688 Record.push_back(N->getAttributes());
1689 Record.push_back(VE.getMetadataOrNullID(N->getType()));
1691 Stream.EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev);
1695 void ModuleBitcodeWriter::writeDIImportedEntity(
1696 const DIImportedEntity *N, SmallVectorImpl<uint64_t> &Record,
1698 Record.push_back(N->isDistinct());
1699 Record.push_back(N->getTag());
1700 Record.push_back(VE.getMetadataOrNullID(N->getScope()));
1701 Record.push_back(VE.getMetadataOrNullID(N->getEntity()));
1702 Record.push_back(N->getLine());
1703 Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
1705 Stream.EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev);
1709 unsigned ModuleBitcodeWriter::createNamedMetadataAbbrev() {
1710 auto Abbv = std::make_shared<BitCodeAbbrev>();
1711 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME));
1712 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1713 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1714 return Stream.EmitAbbrev(std::move(Abbv));
1717 void ModuleBitcodeWriter::writeNamedMetadata(
1718 SmallVectorImpl<uint64_t> &Record) {
1719 if (M.named_metadata_empty())
1722 unsigned Abbrev = createNamedMetadataAbbrev();
1723 for (const NamedMDNode &NMD : M.named_metadata()) {
1725 StringRef Str = NMD.getName();
1726 Record.append(Str.bytes_begin(), Str.bytes_end());
1727 Stream.EmitRecord(bitc::METADATA_NAME, Record, Abbrev);
1730 // Write named metadata operands.
1731 for (const MDNode *N : NMD.operands())
1732 Record.push_back(VE.getMetadataID(N));
1733 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
1738 unsigned ModuleBitcodeWriter::createMetadataStringsAbbrev() {
1739 auto Abbv = std::make_shared<BitCodeAbbrev>();
1740 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRINGS));
1741 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of strings
1742 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // offset to chars
1743 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1744 return Stream.EmitAbbrev(std::move(Abbv));
1747 /// Write out a record for MDString.
1749 /// All the metadata strings in a metadata block are emitted in a single
1750 /// record. The sizes and strings themselves are shoved into a blob.
1751 void ModuleBitcodeWriter::writeMetadataStrings(
1752 ArrayRef<const Metadata *> Strings, SmallVectorImpl<uint64_t> &Record) {
1753 if (Strings.empty())
1756 // Start the record with the number of strings.
1757 Record.push_back(bitc::METADATA_STRINGS);
1758 Record.push_back(Strings.size());
1760 // Emit the sizes of the strings in the blob.
1761 SmallString<256> Blob;
1763 BitstreamWriter W(Blob);
1764 for (const Metadata *MD : Strings)
1765 W.EmitVBR(cast<MDString>(MD)->getLength(), 6);
1769 // Add the offset to the strings to the record.
1770 Record.push_back(Blob.size());
1772 // Add the strings to the blob.
1773 for (const Metadata *MD : Strings)
1774 Blob.append(cast<MDString>(MD)->getString());
1776 // Emit the final record.
1777 Stream.EmitRecordWithBlob(createMetadataStringsAbbrev(), Record, Blob);
1781 // Generates an enum to use as an index in the Abbrev array of Metadata record.
1782 enum MetadataAbbrev : unsigned {
1783 #define HANDLE_MDNODE_LEAF(CLASS) CLASS##AbbrevID,
1784 #include "llvm/IR/Metadata.def"
1788 void ModuleBitcodeWriter::writeMetadataRecords(
1789 ArrayRef<const Metadata *> MDs, SmallVectorImpl<uint64_t> &Record,
1790 std::vector<unsigned> *MDAbbrevs, std::vector<uint64_t> *IndexPos) {
1794 // Initialize MDNode abbreviations.
1795 #define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0;
1796 #include "llvm/IR/Metadata.def"
1798 for (const Metadata *MD : MDs) {
1800 IndexPos->push_back(Stream.GetCurrentBitNo());
1801 if (const MDNode *N = dyn_cast<MDNode>(MD)) {
1802 assert(N->isResolved() && "Expected forward references to be resolved");
1804 switch (N->getMetadataID()) {
1806 llvm_unreachable("Invalid MDNode subclass");
1807 #define HANDLE_MDNODE_LEAF(CLASS) \
1808 case Metadata::CLASS##Kind: \
1810 write##CLASS(cast<CLASS>(N), Record, \
1811 (*MDAbbrevs)[MetadataAbbrev::CLASS##AbbrevID]); \
1813 write##CLASS(cast<CLASS>(N), Record, CLASS##Abbrev); \
1815 #include "llvm/IR/Metadata.def"
1818 writeValueAsMetadata(cast<ValueAsMetadata>(MD), Record);
1822 void ModuleBitcodeWriter::writeModuleMetadata() {
1823 if (!VE.hasMDs() && M.named_metadata_empty())
1826 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 4);
1827 SmallVector<uint64_t, 64> Record;
1829 // Emit all abbrevs upfront, so that the reader can jump in the middle of the
1830 // block and load any metadata.
1831 std::vector<unsigned> MDAbbrevs;
1833 MDAbbrevs.resize(MetadataAbbrev::LastPlusOne);
1834 MDAbbrevs[MetadataAbbrev::DILocationAbbrevID] = createDILocationAbbrev();
1835 MDAbbrevs[MetadataAbbrev::GenericDINodeAbbrevID] =
1836 createGenericDINodeAbbrev();
1838 auto Abbv = std::make_shared<BitCodeAbbrev>();
1839 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX_OFFSET));
1840 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1841 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1842 unsigned OffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1844 Abbv = std::make_shared<BitCodeAbbrev>();
1845 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX));
1846 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1847 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1848 unsigned IndexAbbrev = Stream.EmitAbbrev(std::move(Abbv));
1850 // Emit MDStrings together upfront.
1851 writeMetadataStrings(VE.getMDStrings(), Record);
1853 // We only emit an index for the metadata record if we have more than a given
1854 // (naive) threshold of metadatas, otherwise it is not worth it.
1855 if (VE.getNonMDStrings().size() > IndexThreshold) {
1856 // Write a placeholder value in for the offset of the metadata index,
1857 // which is written after the records, so that it can include
1858 // the offset of each entry. The placeholder offset will be
1859 // updated after all records are emitted.
1860 uint64_t Vals[] = {0, 0};
1861 Stream.EmitRecord(bitc::METADATA_INDEX_OFFSET, Vals, OffsetAbbrev);
1864 // Compute and save the bit offset to the current position, which will be
1865 // patched when we emit the index later. We can simply subtract the 64-bit
1866 // fixed size from the current bit number to get the location to backpatch.
1867 uint64_t IndexOffsetRecordBitPos = Stream.GetCurrentBitNo();
1869 // This index will contain the bitpos for each individual record.
1870 std::vector<uint64_t> IndexPos;
1871 IndexPos.reserve(VE.getNonMDStrings().size());
1873 // Write all the records
1874 writeMetadataRecords(VE.getNonMDStrings(), Record, &MDAbbrevs, &IndexPos);
1876 if (VE.getNonMDStrings().size() > IndexThreshold) {
1877 // Now that we have emitted all the records we will emit the index. But
1879 // backpatch the forward reference so that the reader can skip the records
1881 Stream.BackpatchWord64(IndexOffsetRecordBitPos - 64,
1882 Stream.GetCurrentBitNo() - IndexOffsetRecordBitPos);
1884 // Delta encode the index.
1885 uint64_t PreviousValue = IndexOffsetRecordBitPos;
1886 for (auto &Elt : IndexPos) {
1887 auto EltDelta = Elt - PreviousValue;
1888 PreviousValue = Elt;
1891 // Emit the index record.
1892 Stream.EmitRecord(bitc::METADATA_INDEX, IndexPos, IndexAbbrev);
1896 // Write the named metadata now.
1897 writeNamedMetadata(Record);
1899 auto AddDeclAttachedMetadata = [&](const GlobalObject &GO) {
1900 SmallVector<uint64_t, 4> Record;
1901 Record.push_back(VE.getValueID(&GO));
1902 pushGlobalMetadataAttachment(Record, GO);
1903 Stream.EmitRecord(bitc::METADATA_GLOBAL_DECL_ATTACHMENT, Record);
1905 for (const Function &F : M)
1906 if (F.isDeclaration() && F.hasMetadata())
1907 AddDeclAttachedMetadata(F);
1908 // FIXME: Only store metadata for declarations here, and move data for global
1909 // variable definitions to a separate block (PR28134).
1910 for (const GlobalVariable &GV : M.globals())
1911 if (GV.hasMetadata())
1912 AddDeclAttachedMetadata(GV);
1917 void ModuleBitcodeWriter::writeFunctionMetadata(const Function &F) {
1921 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
1922 SmallVector<uint64_t, 64> Record;
1923 writeMetadataStrings(VE.getMDStrings(), Record);
1924 writeMetadataRecords(VE.getNonMDStrings(), Record);
1928 void ModuleBitcodeWriter::pushGlobalMetadataAttachment(
1929 SmallVectorImpl<uint64_t> &Record, const GlobalObject &GO) {
1930 // [n x [id, mdnode]]
1931 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
1932 GO.getAllMetadata(MDs);
1933 for (const auto &I : MDs) {
1934 Record.push_back(I.first);
1935 Record.push_back(VE.getMetadataID(I.second));
1939 void ModuleBitcodeWriter::writeFunctionMetadataAttachment(const Function &F) {
1940 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
1942 SmallVector<uint64_t, 64> Record;
1944 if (F.hasMetadata()) {
1945 pushGlobalMetadataAttachment(Record, F);
1946 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
1950 // Write metadata attachments
1951 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
1952 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
1953 for (const BasicBlock &BB : F)
1954 for (const Instruction &I : BB) {
1956 I.getAllMetadataOtherThanDebugLoc(MDs);
1958 // If no metadata, ignore instruction.
1959 if (MDs.empty()) continue;
1961 Record.push_back(VE.getInstructionID(&I));
1963 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
1964 Record.push_back(MDs[i].first);
1965 Record.push_back(VE.getMetadataID(MDs[i].second));
1967 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
1974 void ModuleBitcodeWriter::writeModuleMetadataKinds() {
1975 SmallVector<uint64_t, 64> Record;
1977 // Write metadata kinds
1978 // METADATA_KIND - [n x [id, name]]
1979 SmallVector<StringRef, 8> Names;
1980 M.getMDKindNames(Names);
1982 if (Names.empty()) return;
1984 Stream.EnterSubblock(bitc::METADATA_KIND_BLOCK_ID, 3);
1986 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
1987 Record.push_back(MDKindID);
1988 StringRef KName = Names[MDKindID];
1989 Record.append(KName.begin(), KName.end());
1991 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
1998 void ModuleBitcodeWriter::writeOperandBundleTags() {
1999 // Write metadata kinds
2001 // OPERAND_BUNDLE_TAGS_BLOCK_ID : N x OPERAND_BUNDLE_TAG
2003 // OPERAND_BUNDLE_TAG - [strchr x N]
2005 SmallVector<StringRef, 8> Tags;
2006 M.getOperandBundleTags(Tags);
2011 Stream.EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3);
2013 SmallVector<uint64_t, 64> Record;
2015 for (auto Tag : Tags) {
2016 Record.append(Tag.begin(), Tag.end());
2018 Stream.EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0);
2025 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
2026 if ((int64_t)V >= 0)
2027 Vals.push_back(V << 1);
2029 Vals.push_back((-V << 1) | 1);
2032 void ModuleBitcodeWriter::writeConstants(unsigned FirstVal, unsigned LastVal,
2034 if (FirstVal == LastVal) return;
2036 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
2038 unsigned AggregateAbbrev = 0;
2039 unsigned String8Abbrev = 0;
2040 unsigned CString7Abbrev = 0;
2041 unsigned CString6Abbrev = 0;
2042 // If this is a constant pool for the module, emit module-specific abbrevs.
2044 // Abbrev for CST_CODE_AGGREGATE.
2045 auto Abbv = std::make_shared<BitCodeAbbrev>();
2046 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
2047 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2048 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
2049 AggregateAbbrev = Stream.EmitAbbrev(std::move(Abbv));
2051 // Abbrev for CST_CODE_STRING.
2052 Abbv = std::make_shared<BitCodeAbbrev>();
2053 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
2054 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2055 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
2056 String8Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2057 // Abbrev for CST_CODE_CSTRING.
2058 Abbv = std::make_shared<BitCodeAbbrev>();
2059 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
2060 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2061 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
2062 CString7Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2063 // Abbrev for CST_CODE_CSTRING.
2064 Abbv = std::make_shared<BitCodeAbbrev>();
2065 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
2066 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2067 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
2068 CString6Abbrev = Stream.EmitAbbrev(std::move(Abbv));
2071 SmallVector<uint64_t, 64> Record;
2073 const ValueEnumerator::ValueList &Vals = VE.getValues();
2074 Type *LastTy = nullptr;
2075 for (unsigned i = FirstVal; i != LastVal; ++i) {
2076 const Value *V = Vals[i].first;
2077 // If we need to switch types, do so now.
2078 if (V->getType() != LastTy) {
2079 LastTy = V->getType();
2080 Record.push_back(VE.getTypeID(LastTy));
2081 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
2082 CONSTANTS_SETTYPE_ABBREV);
2086 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
2087 Record.push_back(unsigned(IA->hasSideEffects()) |
2088 unsigned(IA->isAlignStack()) << 1 |
2089 unsigned(IA->getDialect()&1) << 2);
2091 // Add the asm string.
2092 const std::string &AsmStr = IA->getAsmString();
2093 Record.push_back(AsmStr.size());
2094 Record.append(AsmStr.begin(), AsmStr.end());
2096 // Add the constraint string.
2097 const std::string &ConstraintStr = IA->getConstraintString();
2098 Record.push_back(ConstraintStr.size());
2099 Record.append(ConstraintStr.begin(), ConstraintStr.end());
2100 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
2104 const Constant *C = cast<Constant>(V);
2105 unsigned Code = -1U;
2106 unsigned AbbrevToUse = 0;
2107 if (C->isNullValue()) {
2108 Code = bitc::CST_CODE_NULL;
2109 } else if (isa<UndefValue>(C)) {
2110 Code = bitc::CST_CODE_UNDEF;
2111 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
2112 if (IV->getBitWidth() <= 64) {
2113 uint64_t V = IV->getSExtValue();
2114 emitSignedInt64(Record, V);
2115 Code = bitc::CST_CODE_INTEGER;
2116 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
2117 } else { // Wide integers, > 64 bits in size.
2118 // We have an arbitrary precision integer value to write whose
2119 // bit width is > 64. However, in canonical unsigned integer
2120 // format it is likely that the high bits are going to be zero.
2121 // So, we only write the number of active words.
2122 unsigned NWords = IV->getValue().getActiveWords();
2123 const uint64_t *RawWords = IV->getValue().getRawData();
2124 for (unsigned i = 0; i != NWords; ++i) {
2125 emitSignedInt64(Record, RawWords[i]);
2127 Code = bitc::CST_CODE_WIDE_INTEGER;
2129 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
2130 Code = bitc::CST_CODE_FLOAT;
2131 Type *Ty = CFP->getType();
2132 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) {
2133 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
2134 } else if (Ty->isX86_FP80Ty()) {
2135 // api needed to prevent premature destruction
2136 // bits are not in the same order as a normal i80 APInt, compensate.
2137 APInt api = CFP->getValueAPF().bitcastToAPInt();
2138 const uint64_t *p = api.getRawData();
2139 Record.push_back((p[1] << 48) | (p[0] >> 16));
2140 Record.push_back(p[0] & 0xffffLL);
2141 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
2142 APInt api = CFP->getValueAPF().bitcastToAPInt();
2143 const uint64_t *p = api.getRawData();
2144 Record.push_back(p[0]);
2145 Record.push_back(p[1]);
2147 assert (0 && "Unknown FP type!");
2149 } else if (isa<ConstantDataSequential>(C) &&
2150 cast<ConstantDataSequential>(C)->isString()) {
2151 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
2152 // Emit constant strings specially.
2153 unsigned NumElts = Str->getNumElements();
2154 // If this is a null-terminated string, use the denser CSTRING encoding.
2155 if (Str->isCString()) {
2156 Code = bitc::CST_CODE_CSTRING;
2157 --NumElts; // Don't encode the null, which isn't allowed by char6.
2159 Code = bitc::CST_CODE_STRING;
2160 AbbrevToUse = String8Abbrev;
2162 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
2163 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
2164 for (unsigned i = 0; i != NumElts; ++i) {
2165 unsigned char V = Str->getElementAsInteger(i);
2166 Record.push_back(V);
2167 isCStr7 &= (V & 128) == 0;
2169 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
2173 AbbrevToUse = CString6Abbrev;
2175 AbbrevToUse = CString7Abbrev;
2176 } else if (const ConstantDataSequential *CDS =
2177 dyn_cast<ConstantDataSequential>(C)) {
2178 Code = bitc::CST_CODE_DATA;
2179 Type *EltTy = CDS->getType()->getElementType();
2180 if (isa<IntegerType>(EltTy)) {
2181 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
2182 Record.push_back(CDS->getElementAsInteger(i));
2184 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
2186 CDS->getElementAsAPFloat(i).bitcastToAPInt().getLimitedValue());
2188 } else if (isa<ConstantAggregate>(C)) {
2189 Code = bitc::CST_CODE_AGGREGATE;
2190 for (const Value *Op : C->operands())
2191 Record.push_back(VE.getValueID(Op));
2192 AbbrevToUse = AggregateAbbrev;
2193 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
2194 switch (CE->getOpcode()) {
2196 if (Instruction::isCast(CE->getOpcode())) {
2197 Code = bitc::CST_CODE_CE_CAST;
2198 Record.push_back(getEncodedCastOpcode(CE->getOpcode()));
2199 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2200 Record.push_back(VE.getValueID(C->getOperand(0)));
2201 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
2203 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
2204 Code = bitc::CST_CODE_CE_BINOP;
2205 Record.push_back(getEncodedBinaryOpcode(CE->getOpcode()));
2206 Record.push_back(VE.getValueID(C->getOperand(0)));
2207 Record.push_back(VE.getValueID(C->getOperand(1)));
2208 uint64_t Flags = getOptimizationFlags(CE);
2210 Record.push_back(Flags);
2213 case Instruction::GetElementPtr: {
2214 Code = bitc::CST_CODE_CE_GEP;
2215 const auto *GO = cast<GEPOperator>(C);
2216 Record.push_back(VE.getTypeID(GO->getSourceElementType()));
2217 if (Optional<unsigned> Idx = GO->getInRangeIndex()) {
2218 Code = bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX;
2219 Record.push_back((*Idx << 1) | GO->isInBounds());
2220 } else if (GO->isInBounds())
2221 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
2222 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
2223 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
2224 Record.push_back(VE.getValueID(C->getOperand(i)));
2228 case Instruction::Select:
2229 Code = bitc::CST_CODE_CE_SELECT;
2230 Record.push_back(VE.getValueID(C->getOperand(0)));
2231 Record.push_back(VE.getValueID(C->getOperand(1)));
2232 Record.push_back(VE.getValueID(C->getOperand(2)));
2234 case Instruction::ExtractElement:
2235 Code = bitc::CST_CODE_CE_EXTRACTELT;
2236 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2237 Record.push_back(VE.getValueID(C->getOperand(0)));
2238 Record.push_back(VE.getTypeID(C->getOperand(1)->getType()));
2239 Record.push_back(VE.getValueID(C->getOperand(1)));
2241 case Instruction::InsertElement:
2242 Code = bitc::CST_CODE_CE_INSERTELT;
2243 Record.push_back(VE.getValueID(C->getOperand(0)));
2244 Record.push_back(VE.getValueID(C->getOperand(1)));
2245 Record.push_back(VE.getTypeID(C->getOperand(2)->getType()));
2246 Record.push_back(VE.getValueID(C->getOperand(2)));
2248 case Instruction::ShuffleVector:
2249 // If the return type and argument types are the same, this is a
2250 // standard shufflevector instruction. If the types are different,
2251 // then the shuffle is widening or truncating the input vectors, and
2252 // the argument type must also be encoded.
2253 if (C->getType() == C->getOperand(0)->getType()) {
2254 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
2256 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
2257 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2259 Record.push_back(VE.getValueID(C->getOperand(0)));
2260 Record.push_back(VE.getValueID(C->getOperand(1)));
2261 Record.push_back(VE.getValueID(C->getOperand(2)));
2263 case Instruction::ICmp:
2264 case Instruction::FCmp:
2265 Code = bitc::CST_CODE_CE_CMP;
2266 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
2267 Record.push_back(VE.getValueID(C->getOperand(0)));
2268 Record.push_back(VE.getValueID(C->getOperand(1)));
2269 Record.push_back(CE->getPredicate());
2272 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
2273 Code = bitc::CST_CODE_BLOCKADDRESS;
2274 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
2275 Record.push_back(VE.getValueID(BA->getFunction()));
2276 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
2281 llvm_unreachable("Unknown constant!");
2283 Stream.EmitRecord(Code, Record, AbbrevToUse);
2290 void ModuleBitcodeWriter::writeModuleConstants() {
2291 const ValueEnumerator::ValueList &Vals = VE.getValues();
2293 // Find the first constant to emit, which is the first non-globalvalue value.
2294 // We know globalvalues have been emitted by WriteModuleInfo.
2295 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
2296 if (!isa<GlobalValue>(Vals[i].first)) {
2297 writeConstants(i, Vals.size(), true);
2303 /// pushValueAndType - The file has to encode both the value and type id for
2304 /// many values, because we need to know what type to create for forward
2305 /// references. However, most operands are not forward references, so this type
2306 /// field is not needed.
2308 /// This function adds V's value ID to Vals. If the value ID is higher than the
2309 /// instruction ID, then it is a forward reference, and it also includes the
2310 /// type ID. The value ID that is written is encoded relative to the InstID.
2311 bool ModuleBitcodeWriter::pushValueAndType(const Value *V, unsigned InstID,
2312 SmallVectorImpl<unsigned> &Vals) {
2313 unsigned ValID = VE.getValueID(V);
2314 // Make encoding relative to the InstID.
2315 Vals.push_back(InstID - ValID);
2316 if (ValID >= InstID) {
2317 Vals.push_back(VE.getTypeID(V->getType()));
2323 void ModuleBitcodeWriter::writeOperandBundles(ImmutableCallSite CS,
2325 SmallVector<unsigned, 64> Record;
2326 LLVMContext &C = CS.getInstruction()->getContext();
2328 for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i) {
2329 const auto &Bundle = CS.getOperandBundleAt(i);
2330 Record.push_back(C.getOperandBundleTagID(Bundle.getTagName()));
2332 for (auto &Input : Bundle.Inputs)
2333 pushValueAndType(Input, InstID, Record);
2335 Stream.EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record);
2340 /// pushValue - Like pushValueAndType, but where the type of the value is
2341 /// omitted (perhaps it was already encoded in an earlier operand).
2342 void ModuleBitcodeWriter::pushValue(const Value *V, unsigned InstID,
2343 SmallVectorImpl<unsigned> &Vals) {
2344 unsigned ValID = VE.getValueID(V);
2345 Vals.push_back(InstID - ValID);
2348 void ModuleBitcodeWriter::pushValueSigned(const Value *V, unsigned InstID,
2349 SmallVectorImpl<uint64_t> &Vals) {
2350 unsigned ValID = VE.getValueID(V);
2351 int64_t diff = ((int32_t)InstID - (int32_t)ValID);
2352 emitSignedInt64(Vals, diff);
2355 /// WriteInstruction - Emit an instruction to the specified stream.
2356 void ModuleBitcodeWriter::writeInstruction(const Instruction &I,
2358 SmallVectorImpl<unsigned> &Vals) {
2360 unsigned AbbrevToUse = 0;
2361 VE.setInstructionID(&I);
2362 switch (I.getOpcode()) {
2364 if (Instruction::isCast(I.getOpcode())) {
2365 Code = bitc::FUNC_CODE_INST_CAST;
2366 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2367 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
2368 Vals.push_back(VE.getTypeID(I.getType()));
2369 Vals.push_back(getEncodedCastOpcode(I.getOpcode()));
2371 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
2372 Code = bitc::FUNC_CODE_INST_BINOP;
2373 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2374 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
2375 pushValue(I.getOperand(1), InstID, Vals);
2376 Vals.push_back(getEncodedBinaryOpcode(I.getOpcode()));
2377 uint64_t Flags = getOptimizationFlags(&I);
2379 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
2380 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
2381 Vals.push_back(Flags);
2386 case Instruction::GetElementPtr: {
2387 Code = bitc::FUNC_CODE_INST_GEP;
2388 AbbrevToUse = FUNCTION_INST_GEP_ABBREV;
2389 auto &GEPInst = cast<GetElementPtrInst>(I);
2390 Vals.push_back(GEPInst.isInBounds());
2391 Vals.push_back(VE.getTypeID(GEPInst.getSourceElementType()));
2392 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
2393 pushValueAndType(I.getOperand(i), InstID, Vals);
2396 case Instruction::ExtractValue: {
2397 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
2398 pushValueAndType(I.getOperand(0), InstID, Vals);
2399 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
2400 Vals.append(EVI->idx_begin(), EVI->idx_end());
2403 case Instruction::InsertValue: {
2404 Code = bitc::FUNC_CODE_INST_INSERTVAL;
2405 pushValueAndType(I.getOperand(0), InstID, Vals);
2406 pushValueAndType(I.getOperand(1), InstID, Vals);
2407 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
2408 Vals.append(IVI->idx_begin(), IVI->idx_end());
2411 case Instruction::Select:
2412 Code = bitc::FUNC_CODE_INST_VSELECT;
2413 pushValueAndType(I.getOperand(1), InstID, Vals);
2414 pushValue(I.getOperand(2), InstID, Vals);
2415 pushValueAndType(I.getOperand(0), InstID, Vals);
2417 case Instruction::ExtractElement:
2418 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
2419 pushValueAndType(I.getOperand(0), InstID, Vals);
2420 pushValueAndType(I.getOperand(1), InstID, Vals);
2422 case Instruction::InsertElement:
2423 Code = bitc::FUNC_CODE_INST_INSERTELT;
2424 pushValueAndType(I.getOperand(0), InstID, Vals);
2425 pushValue(I.getOperand(1), InstID, Vals);
2426 pushValueAndType(I.getOperand(2), InstID, Vals);
2428 case Instruction::ShuffleVector:
2429 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
2430 pushValueAndType(I.getOperand(0), InstID, Vals);
2431 pushValue(I.getOperand(1), InstID, Vals);
2432 pushValue(I.getOperand(2), InstID, Vals);
2434 case Instruction::ICmp:
2435 case Instruction::FCmp: {
2436 // compare returning Int1Ty or vector of Int1Ty
2437 Code = bitc::FUNC_CODE_INST_CMP2;
2438 pushValueAndType(I.getOperand(0), InstID, Vals);
2439 pushValue(I.getOperand(1), InstID, Vals);
2440 Vals.push_back(cast<CmpInst>(I).getPredicate());
2441 uint64_t Flags = getOptimizationFlags(&I);
2443 Vals.push_back(Flags);
2447 case Instruction::Ret:
2449 Code = bitc::FUNC_CODE_INST_RET;
2450 unsigned NumOperands = I.getNumOperands();
2451 if (NumOperands == 0)
2452 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
2453 else if (NumOperands == 1) {
2454 if (!pushValueAndType(I.getOperand(0), InstID, Vals))
2455 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
2457 for (unsigned i = 0, e = NumOperands; i != e; ++i)
2458 pushValueAndType(I.getOperand(i), InstID, Vals);
2462 case Instruction::Br:
2464 Code = bitc::FUNC_CODE_INST_BR;
2465 const BranchInst &II = cast<BranchInst>(I);
2466 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
2467 if (II.isConditional()) {
2468 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
2469 pushValue(II.getCondition(), InstID, Vals);
2473 case Instruction::Switch:
2475 Code = bitc::FUNC_CODE_INST_SWITCH;
2476 const SwitchInst &SI = cast<SwitchInst>(I);
2477 Vals.push_back(VE.getTypeID(SI.getCondition()->getType()));
2478 pushValue(SI.getCondition(), InstID, Vals);
2479 Vals.push_back(VE.getValueID(SI.getDefaultDest()));
2480 for (auto Case : SI.cases()) {
2481 Vals.push_back(VE.getValueID(Case.getCaseValue()));
2482 Vals.push_back(VE.getValueID(Case.getCaseSuccessor()));
2486 case Instruction::IndirectBr:
2487 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
2488 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
2489 // Encode the address operand as relative, but not the basic blocks.
2490 pushValue(I.getOperand(0), InstID, Vals);
2491 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i)
2492 Vals.push_back(VE.getValueID(I.getOperand(i)));
2495 case Instruction::Invoke: {
2496 const InvokeInst *II = cast<InvokeInst>(&I);
2497 const Value *Callee = II->getCalledValue();
2498 FunctionType *FTy = II->getFunctionType();
2500 if (II->hasOperandBundles())
2501 writeOperandBundles(II, InstID);
2503 Code = bitc::FUNC_CODE_INST_INVOKE;
2505 Vals.push_back(VE.getAttributeListID(II->getAttributes()));
2506 Vals.push_back(II->getCallingConv() | 1 << 13);
2507 Vals.push_back(VE.getValueID(II->getNormalDest()));
2508 Vals.push_back(VE.getValueID(II->getUnwindDest()));
2509 Vals.push_back(VE.getTypeID(FTy));
2510 pushValueAndType(Callee, InstID, Vals);
2512 // Emit value #'s for the fixed parameters.
2513 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
2514 pushValue(I.getOperand(i), InstID, Vals); // fixed param.
2516 // Emit type/value pairs for varargs params.
2517 if (FTy->isVarArg()) {
2518 for (unsigned i = FTy->getNumParams(), e = II->getNumArgOperands();
2520 pushValueAndType(I.getOperand(i), InstID, Vals); // vararg
2524 case Instruction::Resume:
2525 Code = bitc::FUNC_CODE_INST_RESUME;
2526 pushValueAndType(I.getOperand(0), InstID, Vals);
2528 case Instruction::CleanupRet: {
2529 Code = bitc::FUNC_CODE_INST_CLEANUPRET;
2530 const auto &CRI = cast<CleanupReturnInst>(I);
2531 pushValue(CRI.getCleanupPad(), InstID, Vals);
2532 if (CRI.hasUnwindDest())
2533 Vals.push_back(VE.getValueID(CRI.getUnwindDest()));
2536 case Instruction::CatchRet: {
2537 Code = bitc::FUNC_CODE_INST_CATCHRET;
2538 const auto &CRI = cast<CatchReturnInst>(I);
2539 pushValue(CRI.getCatchPad(), InstID, Vals);
2540 Vals.push_back(VE.getValueID(CRI.getSuccessor()));
2543 case Instruction::CleanupPad:
2544 case Instruction::CatchPad: {
2545 const auto &FuncletPad = cast<FuncletPadInst>(I);
2546 Code = isa<CatchPadInst>(FuncletPad) ? bitc::FUNC_CODE_INST_CATCHPAD
2547 : bitc::FUNC_CODE_INST_CLEANUPPAD;
2548 pushValue(FuncletPad.getParentPad(), InstID, Vals);
2550 unsigned NumArgOperands = FuncletPad.getNumArgOperands();
2551 Vals.push_back(NumArgOperands);
2552 for (unsigned Op = 0; Op != NumArgOperands; ++Op)
2553 pushValueAndType(FuncletPad.getArgOperand(Op), InstID, Vals);
2556 case Instruction::CatchSwitch: {
2557 Code = bitc::FUNC_CODE_INST_CATCHSWITCH;
2558 const auto &CatchSwitch = cast<CatchSwitchInst>(I);
2560 pushValue(CatchSwitch.getParentPad(), InstID, Vals);
2562 unsigned NumHandlers = CatchSwitch.getNumHandlers();
2563 Vals.push_back(NumHandlers);
2564 for (const BasicBlock *CatchPadBB : CatchSwitch.handlers())
2565 Vals.push_back(VE.getValueID(CatchPadBB));
2567 if (CatchSwitch.hasUnwindDest())
2568 Vals.push_back(VE.getValueID(CatchSwitch.getUnwindDest()));
2571 case Instruction::Unreachable:
2572 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
2573 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
2576 case Instruction::PHI: {
2577 const PHINode &PN = cast<PHINode>(I);
2578 Code = bitc::FUNC_CODE_INST_PHI;
2579 // With the newer instruction encoding, forward references could give
2580 // negative valued IDs. This is most common for PHIs, so we use
2582 SmallVector<uint64_t, 128> Vals64;
2583 Vals64.push_back(VE.getTypeID(PN.getType()));
2584 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
2585 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64);
2586 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i)));
2588 // Emit a Vals64 vector and exit.
2589 Stream.EmitRecord(Code, Vals64, AbbrevToUse);
2594 case Instruction::LandingPad: {
2595 const LandingPadInst &LP = cast<LandingPadInst>(I);
2596 Code = bitc::FUNC_CODE_INST_LANDINGPAD;
2597 Vals.push_back(VE.getTypeID(LP.getType()));
2598 Vals.push_back(LP.isCleanup());
2599 Vals.push_back(LP.getNumClauses());
2600 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) {
2602 Vals.push_back(LandingPadInst::Catch);
2604 Vals.push_back(LandingPadInst::Filter);
2605 pushValueAndType(LP.getClause(I), InstID, Vals);
2610 case Instruction::Alloca: {
2611 Code = bitc::FUNC_CODE_INST_ALLOCA;
2612 const AllocaInst &AI = cast<AllocaInst>(I);
2613 Vals.push_back(VE.getTypeID(AI.getAllocatedType()));
2614 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
2615 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
2616 unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1;
2617 assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 &&
2618 "not enough bits for maximum alignment");
2619 assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64");
2620 AlignRecord |= AI.isUsedWithInAlloca() << 5;
2621 AlignRecord |= 1 << 6;
2622 AlignRecord |= AI.isSwiftError() << 7;
2623 Vals.push_back(AlignRecord);
2627 case Instruction::Load:
2628 if (cast<LoadInst>(I).isAtomic()) {
2629 Code = bitc::FUNC_CODE_INST_LOADATOMIC;
2630 pushValueAndType(I.getOperand(0), InstID, Vals);
2632 Code = bitc::FUNC_CODE_INST_LOAD;
2633 if (!pushValueAndType(I.getOperand(0), InstID, Vals)) // ptr
2634 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
2636 Vals.push_back(VE.getTypeID(I.getType()));
2637 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
2638 Vals.push_back(cast<LoadInst>(I).isVolatile());
2639 if (cast<LoadInst>(I).isAtomic()) {
2640 Vals.push_back(getEncodedOrdering(cast<LoadInst>(I).getOrdering()));
2641 Vals.push_back(getEncodedSynchScope(cast<LoadInst>(I).getSynchScope()));
2644 case Instruction::Store:
2645 if (cast<StoreInst>(I).isAtomic())
2646 Code = bitc::FUNC_CODE_INST_STOREATOMIC;
2648 Code = bitc::FUNC_CODE_INST_STORE;
2649 pushValueAndType(I.getOperand(1), InstID, Vals); // ptrty + ptr
2650 pushValueAndType(I.getOperand(0), InstID, Vals); // valty + val
2651 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
2652 Vals.push_back(cast<StoreInst>(I).isVolatile());
2653 if (cast<StoreInst>(I).isAtomic()) {
2654 Vals.push_back(getEncodedOrdering(cast<StoreInst>(I).getOrdering()));
2655 Vals.push_back(getEncodedSynchScope(cast<StoreInst>(I).getSynchScope()));
2658 case Instruction::AtomicCmpXchg:
2659 Code = bitc::FUNC_CODE_INST_CMPXCHG;
2660 pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
2661 pushValueAndType(I.getOperand(1), InstID, Vals); // cmp.
2662 pushValue(I.getOperand(2), InstID, Vals); // newval.
2663 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile());
2665 getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getSuccessOrdering()));
2667 getEncodedSynchScope(cast<AtomicCmpXchgInst>(I).getSynchScope()));
2669 getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getFailureOrdering()));
2670 Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak());
2672 case Instruction::AtomicRMW:
2673 Code = bitc::FUNC_CODE_INST_ATOMICRMW;
2674 pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
2675 pushValue(I.getOperand(1), InstID, Vals); // val.
2677 getEncodedRMWOperation(cast<AtomicRMWInst>(I).getOperation()));
2678 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile());
2679 Vals.push_back(getEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering()));
2681 getEncodedSynchScope(cast<AtomicRMWInst>(I).getSynchScope()));
2683 case Instruction::Fence:
2684 Code = bitc::FUNC_CODE_INST_FENCE;
2685 Vals.push_back(getEncodedOrdering(cast<FenceInst>(I).getOrdering()));
2686 Vals.push_back(getEncodedSynchScope(cast<FenceInst>(I).getSynchScope()));
2688 case Instruction::Call: {
2689 const CallInst &CI = cast<CallInst>(I);
2690 FunctionType *FTy = CI.getFunctionType();
2692 if (CI.hasOperandBundles())
2693 writeOperandBundles(&CI, InstID);
2695 Code = bitc::FUNC_CODE_INST_CALL;
2697 Vals.push_back(VE.getAttributeListID(CI.getAttributes()));
2699 unsigned Flags = getOptimizationFlags(&I);
2700 Vals.push_back(CI.getCallingConv() << bitc::CALL_CCONV |
2701 unsigned(CI.isTailCall()) << bitc::CALL_TAIL |
2702 unsigned(CI.isMustTailCall()) << bitc::CALL_MUSTTAIL |
2703 1 << bitc::CALL_EXPLICIT_TYPE |
2704 unsigned(CI.isNoTailCall()) << bitc::CALL_NOTAIL |
2705 unsigned(Flags != 0) << bitc::CALL_FMF);
2707 Vals.push_back(Flags);
2709 Vals.push_back(VE.getTypeID(FTy));
2710 pushValueAndType(CI.getCalledValue(), InstID, Vals); // Callee
2712 // Emit value #'s for the fixed parameters.
2713 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) {
2714 // Check for labels (can happen with asm labels).
2715 if (FTy->getParamType(i)->isLabelTy())
2716 Vals.push_back(VE.getValueID(CI.getArgOperand(i)));
2718 pushValue(CI.getArgOperand(i), InstID, Vals); // fixed param.
2721 // Emit type/value pairs for varargs params.
2722 if (FTy->isVarArg()) {
2723 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
2725 pushValueAndType(CI.getArgOperand(i), InstID, Vals); // varargs
2729 case Instruction::VAArg:
2730 Code = bitc::FUNC_CODE_INST_VAARG;
2731 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
2732 pushValue(I.getOperand(0), InstID, Vals); // valist.
2733 Vals.push_back(VE.getTypeID(I.getType())); // restype.
2737 Stream.EmitRecord(Code, Vals, AbbrevToUse);
2741 /// Write a GlobalValue VST to the module. The purpose of this data structure is
2742 /// to allow clients to efficiently find the function body.
2743 void ModuleBitcodeWriter::writeGlobalValueSymbolTable(
2744 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
2745 // Get the offset of the VST we are writing, and backpatch it into
2746 // the VST forward declaration record.
2747 uint64_t VSTOffset = Stream.GetCurrentBitNo();
2748 // The BitcodeStartBit was the stream offset of the identification block.
2749 VSTOffset -= bitcodeStartBit();
2750 assert((VSTOffset & 31) == 0 && "VST block not 32-bit aligned");
2751 // Note that we add 1 here because the offset is relative to one word
2752 // before the start of the identification block, which was historically
2753 // always the start of the regular bitcode header.
2754 Stream.BackpatchWord(VSTOffsetPlaceholder, VSTOffset / 32 + 1);
2756 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
2758 auto Abbv = std::make_shared<BitCodeAbbrev>();
2759 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_FNENTRY));
2760 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
2761 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset
2762 unsigned FnEntryAbbrev = Stream.EmitAbbrev(std::move(Abbv));
2764 for (const Function &F : M) {
2767 if (F.isDeclaration())
2770 Record[0] = VE.getValueID(&F);
2772 // Save the word offset of the function (from the start of the
2773 // actual bitcode written to the stream).
2774 uint64_t BitcodeIndex = FunctionToBitcodeIndex[&F] - bitcodeStartBit();
2775 assert((BitcodeIndex & 31) == 0 && "function block not 32-bit aligned");
2776 // Note that we add 1 here because the offset is relative to one word
2777 // before the start of the identification block, which was historically
2778 // always the start of the regular bitcode header.
2779 Record[1] = BitcodeIndex / 32 + 1;
2781 Stream.EmitRecord(bitc::VST_CODE_FNENTRY, Record, FnEntryAbbrev);
2787 /// Emit names for arguments, instructions and basic blocks in a function.
2788 void ModuleBitcodeWriter::writeFunctionLevelValueSymbolTable(
2789 const ValueSymbolTable &VST) {
2793 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
2795 // FIXME: Set up the abbrev, we know how many values there are!
2796 // FIXME: We know if the type names can use 7-bit ascii.
2797 SmallVector<uint64_t, 64> NameVals;
2799 for (const ValueName &Name : VST) {
2800 // Figure out the encoding to use for the name.
2801 StringEncoding Bits =
2802 getStringEncoding(Name.getKeyData(), Name.getKeyLength());
2804 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
2805 NameVals.push_back(VE.getValueID(Name.getValue()));
2807 // VST_CODE_ENTRY: [valueid, namechar x N]
2808 // VST_CODE_BBENTRY: [bbid, namechar x N]
2810 if (isa<BasicBlock>(Name.getValue())) {
2811 Code = bitc::VST_CODE_BBENTRY;
2812 if (Bits == SE_Char6)
2813 AbbrevToUse = VST_BBENTRY_6_ABBREV;
2815 Code = bitc::VST_CODE_ENTRY;
2816 if (Bits == SE_Char6)
2817 AbbrevToUse = VST_ENTRY_6_ABBREV;
2818 else if (Bits == SE_Fixed7)
2819 AbbrevToUse = VST_ENTRY_7_ABBREV;
2822 for (const auto P : Name.getKey())
2823 NameVals.push_back((unsigned char)P);
2825 // Emit the finished record.
2826 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
2833 void ModuleBitcodeWriter::writeUseList(UseListOrder &&Order) {
2834 assert(Order.Shuffle.size() >= 2 && "Shuffle too small");
2836 if (isa<BasicBlock>(Order.V))
2837 Code = bitc::USELIST_CODE_BB;
2839 Code = bitc::USELIST_CODE_DEFAULT;
2841 SmallVector<uint64_t, 64> Record(Order.Shuffle.begin(), Order.Shuffle.end());
2842 Record.push_back(VE.getValueID(Order.V));
2843 Stream.EmitRecord(Code, Record);
2846 void ModuleBitcodeWriter::writeUseListBlock(const Function *F) {
2847 assert(VE.shouldPreserveUseListOrder() &&
2848 "Expected to be preserving use-list order");
2850 auto hasMore = [&]() {
2851 return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
2857 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
2859 writeUseList(std::move(VE.UseListOrders.back()));
2860 VE.UseListOrders.pop_back();
2865 /// Emit a function body to the module stream.
2866 void ModuleBitcodeWriter::writeFunction(
2868 DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
2869 // Save the bitcode index of the start of this function block for recording
2871 FunctionToBitcodeIndex[&F] = Stream.GetCurrentBitNo();
2873 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
2874 VE.incorporateFunction(F);
2876 SmallVector<unsigned, 64> Vals;
2878 // Emit the number of basic blocks, so the reader can create them ahead of
2880 Vals.push_back(VE.getBasicBlocks().size());
2881 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
2884 // If there are function-local constants, emit them now.
2885 unsigned CstStart, CstEnd;
2886 VE.getFunctionConstantRange(CstStart, CstEnd);
2887 writeConstants(CstStart, CstEnd, false);
2889 // If there is function-local metadata, emit it now.
2890 writeFunctionMetadata(F);
2892 // Keep a running idea of what the instruction ID is.
2893 unsigned InstID = CstEnd;
2895 bool NeedsMetadataAttachment = F.hasMetadata();
2897 DILocation *LastDL = nullptr;
2898 // Finally, emit all the instructions, in order.
2899 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2900 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
2902 writeInstruction(*I, InstID, Vals);
2904 if (!I->getType()->isVoidTy())
2907 // If the instruction has metadata, write a metadata attachment later.
2908 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
2910 // If the instruction has a debug location, emit it.
2911 DILocation *DL = I->getDebugLoc();
2916 // Just repeat the same debug loc as last time.
2917 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
2921 Vals.push_back(DL->getLine());
2922 Vals.push_back(DL->getColumn());
2923 Vals.push_back(VE.getMetadataOrNullID(DL->getScope()));
2924 Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt()));
2925 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
2931 // Emit names for all the instructions etc.
2932 if (auto *Symtab = F.getValueSymbolTable())
2933 writeFunctionLevelValueSymbolTable(*Symtab);
2935 if (NeedsMetadataAttachment)
2936 writeFunctionMetadataAttachment(F);
2937 if (VE.shouldPreserveUseListOrder())
2938 writeUseListBlock(&F);
2943 // Emit blockinfo, which defines the standard abbreviations etc.
2944 void ModuleBitcodeWriter::writeBlockInfo() {
2945 // We only want to emit block info records for blocks that have multiple
2946 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK.
2947 // Other blocks can define their abbrevs inline.
2948 Stream.EnterBlockInfoBlock();
2950 { // 8-bit fixed-width VST_CODE_ENTRY/VST_CODE_BBENTRY strings.
2951 auto Abbv = std::make_shared<BitCodeAbbrev>();
2952 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
2953 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
2954 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2955 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
2956 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
2958 llvm_unreachable("Unexpected abbrev ordering!");
2961 { // 7-bit fixed width VST_CODE_ENTRY strings.
2962 auto Abbv = std::make_shared<BitCodeAbbrev>();
2963 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
2964 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
2965 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2966 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
2967 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
2969 llvm_unreachable("Unexpected abbrev ordering!");
2971 { // 6-bit char6 VST_CODE_ENTRY strings.
2972 auto Abbv = std::make_shared<BitCodeAbbrev>();
2973 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
2974 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
2975 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2976 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
2977 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
2979 llvm_unreachable("Unexpected abbrev ordering!");
2981 { // 6-bit char6 VST_CODE_BBENTRY strings.
2982 auto Abbv = std::make_shared<BitCodeAbbrev>();
2983 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
2984 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
2985 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2986 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
2987 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
2988 VST_BBENTRY_6_ABBREV)
2989 llvm_unreachable("Unexpected abbrev ordering!");
2994 { // SETTYPE abbrev for CONSTANTS_BLOCK.
2995 auto Abbv = std::make_shared<BitCodeAbbrev>();
2996 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
2997 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
2998 VE.computeBitsRequiredForTypeIndicies()));
2999 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3000 CONSTANTS_SETTYPE_ABBREV)
3001 llvm_unreachable("Unexpected abbrev ordering!");
3004 { // INTEGER abbrev for CONSTANTS_BLOCK.
3005 auto Abbv = std::make_shared<BitCodeAbbrev>();
3006 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
3007 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3008 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3009 CONSTANTS_INTEGER_ABBREV)
3010 llvm_unreachable("Unexpected abbrev ordering!");
3013 { // CE_CAST abbrev for CONSTANTS_BLOCK.
3014 auto Abbv = std::make_shared<BitCodeAbbrev>();
3015 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
3016 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
3017 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
3018 VE.computeBitsRequiredForTypeIndicies()));
3019 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
3021 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3022 CONSTANTS_CE_CAST_Abbrev)
3023 llvm_unreachable("Unexpected abbrev ordering!");
3025 { // NULL abbrev for CONSTANTS_BLOCK.
3026 auto Abbv = std::make_shared<BitCodeAbbrev>();
3027 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
3028 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
3029 CONSTANTS_NULL_Abbrev)
3030 llvm_unreachable("Unexpected abbrev ordering!");
3033 // FIXME: This should only use space for first class types!
3035 { // INST_LOAD abbrev for FUNCTION_BLOCK.
3036 auto Abbv = std::make_shared<BitCodeAbbrev>();
3037 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
3038 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
3039 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3040 VE.computeBitsRequiredForTypeIndicies()));
3041 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
3042 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
3043 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3044 FUNCTION_INST_LOAD_ABBREV)
3045 llvm_unreachable("Unexpected abbrev ordering!");
3047 { // INST_BINOP abbrev for FUNCTION_BLOCK.
3048 auto Abbv = std::make_shared<BitCodeAbbrev>();
3049 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
3050 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3051 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
3052 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3053 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3054 FUNCTION_INST_BINOP_ABBREV)
3055 llvm_unreachable("Unexpected abbrev ordering!");
3057 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
3058 auto Abbv = std::make_shared<BitCodeAbbrev>();
3059 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
3060 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
3061 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
3062 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3063 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
3064 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3065 FUNCTION_INST_BINOP_FLAGS_ABBREV)
3066 llvm_unreachable("Unexpected abbrev ordering!");
3068 { // INST_CAST abbrev for FUNCTION_BLOCK.
3069 auto Abbv = std::make_shared<BitCodeAbbrev>();
3070 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
3071 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
3072 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3073 VE.computeBitsRequiredForTypeIndicies()));
3074 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
3075 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3076 FUNCTION_INST_CAST_ABBREV)
3077 llvm_unreachable("Unexpected abbrev ordering!");
3080 { // INST_RET abbrev for FUNCTION_BLOCK.
3081 auto Abbv = std::make_shared<BitCodeAbbrev>();
3082 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
3083 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3084 FUNCTION_INST_RET_VOID_ABBREV)
3085 llvm_unreachable("Unexpected abbrev ordering!");
3087 { // INST_RET abbrev for FUNCTION_BLOCK.
3088 auto Abbv = std::make_shared<BitCodeAbbrev>();
3089 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
3090 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
3091 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3092 FUNCTION_INST_RET_VAL_ABBREV)
3093 llvm_unreachable("Unexpected abbrev ordering!");
3095 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
3096 auto Abbv = std::make_shared<BitCodeAbbrev>();
3097 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
3098 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3099 FUNCTION_INST_UNREACHABLE_ABBREV)
3100 llvm_unreachable("Unexpected abbrev ordering!");
3103 auto Abbv = std::make_shared<BitCodeAbbrev>();
3104 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_GEP));
3105 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
3106 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
3107 Log2_32_Ceil(VE.getTypes().size() + 1)));
3108 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3109 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
3110 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
3111 FUNCTION_INST_GEP_ABBREV)
3112 llvm_unreachable("Unexpected abbrev ordering!");
3118 /// Write the module path strings, currently only used when generating
3119 /// a combined index file.
3120 void IndexBitcodeWriter::writeModStrings() {
3121 Stream.EnterSubblock(bitc::MODULE_STRTAB_BLOCK_ID, 3);
3123 // TODO: See which abbrev sizes we actually need to emit
3125 // 8-bit fixed-width MST_ENTRY strings.
3126 auto Abbv = std::make_shared<BitCodeAbbrev>();
3127 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3128 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3129 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3130 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
3131 unsigned Abbrev8Bit = Stream.EmitAbbrev(std::move(Abbv));
3133 // 7-bit fixed width MST_ENTRY strings.
3134 Abbv = std::make_shared<BitCodeAbbrev>();
3135 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3136 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3137 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3138 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
3139 unsigned Abbrev7Bit = Stream.EmitAbbrev(std::move(Abbv));
3141 // 6-bit char6 MST_ENTRY strings.
3142 Abbv = std::make_shared<BitCodeAbbrev>();
3143 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
3144 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3145 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3146 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3147 unsigned Abbrev6Bit = Stream.EmitAbbrev(std::move(Abbv));
3149 // Module Hash, 160 bits SHA1. Optionally, emitted after each MST_CODE_ENTRY.
3150 Abbv = std::make_shared<BitCodeAbbrev>();
3151 Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_HASH));
3152 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3153 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3154 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3155 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3156 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3157 unsigned AbbrevHash = Stream.EmitAbbrev(std::move(Abbv));
3159 SmallVector<unsigned, 64> Vals;
3160 for (const auto &MPSE : Index.modulePaths()) {
3161 if (!doIncludeModule(MPSE.getKey()))
3163 StringEncoding Bits =
3164 getStringEncoding(MPSE.getKey().data(), MPSE.getKey().size());
3165 unsigned AbbrevToUse = Abbrev8Bit;
3166 if (Bits == SE_Char6)
3167 AbbrevToUse = Abbrev6Bit;
3168 else if (Bits == SE_Fixed7)
3169 AbbrevToUse = Abbrev7Bit;
3171 Vals.push_back(MPSE.getValue().first);
3173 for (const auto P : MPSE.getKey())
3174 Vals.push_back((unsigned char)P);
3176 // Emit the finished record.
3177 Stream.EmitRecord(bitc::MST_CODE_ENTRY, Vals, AbbrevToUse);
3180 // Emit an optional hash for the module now
3181 auto &Hash = MPSE.getValue().second;
3182 bool AllZero = true; // Detect if the hash is empty, and do not generate it
3183 for (auto Val : Hash) {
3186 Vals.push_back(Val);
3189 // Emit the hash record.
3190 Stream.EmitRecord(bitc::MST_CODE_HASH, Vals, AbbrevHash);
3198 /// Write the function type metadata related records that need to appear before
3199 /// a function summary entry (whether per-module or combined).
3200 static void writeFunctionTypeMetadataRecords(BitstreamWriter &Stream,
3201 FunctionSummary *FS) {
3202 if (!FS->type_tests().empty())
3203 Stream.EmitRecord(bitc::FS_TYPE_TESTS, FS->type_tests());
3205 SmallVector<uint64_t, 64> Record;
3207 auto WriteVFuncIdVec = [&](uint64_t Ty,
3208 ArrayRef<FunctionSummary::VFuncId> VFs) {
3212 for (auto &VF : VFs) {
3213 Record.push_back(VF.GUID);
3214 Record.push_back(VF.Offset);
3216 Stream.EmitRecord(Ty, Record);
3219 WriteVFuncIdVec(bitc::FS_TYPE_TEST_ASSUME_VCALLS,
3220 FS->type_test_assume_vcalls());
3221 WriteVFuncIdVec(bitc::FS_TYPE_CHECKED_LOAD_VCALLS,
3222 FS->type_checked_load_vcalls());
3224 auto WriteConstVCallVec = [&](uint64_t Ty,
3225 ArrayRef<FunctionSummary::ConstVCall> VCs) {
3226 for (auto &VC : VCs) {
3228 Record.push_back(VC.VFunc.GUID);
3229 Record.push_back(VC.VFunc.Offset);
3230 Record.insert(Record.end(), VC.Args.begin(), VC.Args.end());
3231 Stream.EmitRecord(Ty, Record);
3235 WriteConstVCallVec(bitc::FS_TYPE_TEST_ASSUME_CONST_VCALL,
3236 FS->type_test_assume_const_vcalls());
3237 WriteConstVCallVec(bitc::FS_TYPE_CHECKED_LOAD_CONST_VCALL,
3238 FS->type_checked_load_const_vcalls());
3241 // Helper to emit a single function summary record.
3242 void ModuleBitcodeWriter::writePerModuleFunctionSummaryRecord(
3243 SmallVector<uint64_t, 64> &NameVals, GlobalValueSummary *Summary,
3244 unsigned ValueID, unsigned FSCallsAbbrev, unsigned FSCallsProfileAbbrev,
3245 const Function &F) {
3246 NameVals.push_back(ValueID);
3248 FunctionSummary *FS = cast<FunctionSummary>(Summary);
3249 writeFunctionTypeMetadataRecords(Stream, FS);
3251 NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
3252 NameVals.push_back(FS->instCount());
3253 NameVals.push_back(FS->refs().size());
3255 for (auto &RI : FS->refs())
3256 NameVals.push_back(VE.getValueID(RI.getValue()));
3258 bool HasProfileData = F.getEntryCount().hasValue();
3259 for (auto &ECI : FS->calls()) {
3260 NameVals.push_back(getValueId(ECI.first));
3262 NameVals.push_back(static_cast<uint8_t>(ECI.second.Hotness));
3265 unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
3267 (HasProfileData ? bitc::FS_PERMODULE_PROFILE : bitc::FS_PERMODULE);
3269 // Emit the finished record.
3270 Stream.EmitRecord(Code, NameVals, FSAbbrev);
3274 // Collect the global value references in the given variable's initializer,
3275 // and emit them in a summary record.
3276 void ModuleBitcodeWriter::writeModuleLevelReferences(
3277 const GlobalVariable &V, SmallVector<uint64_t, 64> &NameVals,
3278 unsigned FSModRefsAbbrev) {
3279 auto VI = Index->getValueInfo(GlobalValue::getGUID(V.getName()));
3280 if (!VI || VI.getSummaryList().empty()) {
3281 // Only declarations should not have a summary (a declaration might however
3282 // have a summary if the def was in module level asm).
3283 assert(V.isDeclaration());
3286 auto *Summary = VI.getSummaryList()[0].get();
3287 NameVals.push_back(VE.getValueID(&V));
3288 GlobalVarSummary *VS = cast<GlobalVarSummary>(Summary);
3289 NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
3291 unsigned SizeBeforeRefs = NameVals.size();
3292 for (auto &RI : VS->refs())
3293 NameVals.push_back(VE.getValueID(RI.getValue()));
3294 // Sort the refs for determinism output, the vector returned by FS->refs() has
3295 // been initialized from a DenseSet.
3296 std::sort(NameVals.begin() + SizeBeforeRefs, NameVals.end());
3298 Stream.EmitRecord(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS, NameVals,
3303 // Current version for the summary.
3304 // This is bumped whenever we introduce changes in the way some record are
3305 // interpreted, like flags for instance.
3306 static const uint64_t INDEX_VERSION = 3;
3308 /// Emit the per-module summary section alongside the rest of
3309 /// the module's bitcode.
3310 void ModuleBitcodeWriter::writePerModuleGlobalValueSummary() {
3311 Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 4);
3313 Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
3315 if (Index->begin() == Index->end()) {
3320 for (const auto &GVI : valueIds()) {
3321 Stream.EmitRecord(bitc::FS_VALUE_GUID,
3322 ArrayRef<uint64_t>{GVI.second, GVI.first});
3325 // Abbrev for FS_PERMODULE.
3326 auto Abbv = std::make_shared<BitCodeAbbrev>();
3327 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE));
3328 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3329 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3330 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3331 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3332 // numrefs x valueid, n x (valueid)
3333 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3334 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3335 unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3337 // Abbrev for FS_PERMODULE_PROFILE.
3338 Abbv = std::make_shared<BitCodeAbbrev>();
3339 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_PROFILE));
3340 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3341 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3342 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3343 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3344 // numrefs x valueid, n x (valueid, hotness)
3345 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3346 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3347 unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3349 // Abbrev for FS_PERMODULE_GLOBALVAR_INIT_REFS.
3350 Abbv = std::make_shared<BitCodeAbbrev>();
3351 Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS));
3352 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3353 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3354 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); // valueids
3355 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3356 unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3358 // Abbrev for FS_ALIAS.
3359 Abbv = std::make_shared<BitCodeAbbrev>();
3360 Abbv->Add(BitCodeAbbrevOp(bitc::FS_ALIAS));
3361 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3362 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3363 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3364 unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3366 SmallVector<uint64_t, 64> NameVals;
3367 // Iterate over the list of functions instead of the Index to
3368 // ensure the ordering is stable.
3369 for (const Function &F : M) {
3370 // Summary emission does not support anonymous functions, they have to
3371 // renamed using the anonymous function renaming pass.
3373 report_fatal_error("Unexpected anonymous function when writing summary");
3375 ValueInfo VI = Index->getValueInfo(GlobalValue::getGUID(F.getName()));
3376 if (!VI || VI.getSummaryList().empty()) {
3377 // Only declarations should not have a summary (a declaration might
3378 // however have a summary if the def was in module level asm).
3379 assert(F.isDeclaration());
3382 auto *Summary = VI.getSummaryList()[0].get();
3383 writePerModuleFunctionSummaryRecord(NameVals, Summary, VE.getValueID(&F),
3384 FSCallsAbbrev, FSCallsProfileAbbrev, F);
3387 // Capture references from GlobalVariable initializers, which are outside
3388 // of a function scope.
3389 for (const GlobalVariable &G : M.globals())
3390 writeModuleLevelReferences(G, NameVals, FSModRefsAbbrev);
3392 for (const GlobalAlias &A : M.aliases()) {
3393 auto *Aliasee = A.getBaseObject();
3394 if (!Aliasee->hasName())
3395 // Nameless function don't have an entry in the summary, skip it.
3397 auto AliasId = VE.getValueID(&A);
3398 auto AliaseeId = VE.getValueID(Aliasee);
3399 NameVals.push_back(AliasId);
3400 auto *Summary = Index->getGlobalValueSummary(A);
3401 AliasSummary *AS = cast<AliasSummary>(Summary);
3402 NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
3403 NameVals.push_back(AliaseeId);
3404 Stream.EmitRecord(bitc::FS_ALIAS, NameVals, FSAliasAbbrev);
3411 /// Emit the combined summary section into the combined index file.
3412 void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
3413 Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
3414 Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
3416 // Create value IDs for undefined references.
3417 forEachSummary([&](GVInfo I) {
3418 for (auto &RI : I.second->refs())
3419 assignValueId(RI.getGUID());
3422 for (const auto &GVI : valueIds()) {
3423 Stream.EmitRecord(bitc::FS_VALUE_GUID,
3424 ArrayRef<uint64_t>{GVI.second, GVI.first});
3427 // Abbrev for FS_COMBINED.
3428 auto Abbv = std::make_shared<BitCodeAbbrev>();
3429 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED));
3430 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3431 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3432 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3433 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3434 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3435 // numrefs x valueid, n x (valueid)
3436 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3437 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3438 unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3440 // Abbrev for FS_COMBINED_PROFILE.
3441 Abbv = std::make_shared<BitCodeAbbrev>();
3442 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_PROFILE));
3443 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3444 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3445 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3446 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // instcount
3447 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
3448 // numrefs x valueid, n x (valueid, hotness)
3449 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3450 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3451 unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3453 // Abbrev for FS_COMBINED_GLOBALVAR_INIT_REFS.
3454 Abbv = std::make_shared<BitCodeAbbrev>();
3455 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS));
3456 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3457 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3458 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3459 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); // valueids
3460 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
3461 unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3463 // Abbrev for FS_COMBINED_ALIAS.
3464 Abbv = std::make_shared<BitCodeAbbrev>();
3465 Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_ALIAS));
3466 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3467 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // modid
3468 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
3469 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
3470 unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3472 // The aliases are emitted as a post-pass, and will point to the value
3473 // id of the aliasee. Save them in a vector for post-processing.
3474 SmallVector<AliasSummary *, 64> Aliases;
3476 // Save the value id for each summary for alias emission.
3477 DenseMap<const GlobalValueSummary *, unsigned> SummaryToValueIdMap;
3479 SmallVector<uint64_t, 64> NameVals;
3481 // For local linkage, we also emit the original name separately
3482 // immediately after the record.
3483 auto MaybeEmitOriginalName = [&](GlobalValueSummary &S) {
3484 if (!GlobalValue::isLocalLinkage(S.linkage()))
3486 NameVals.push_back(S.getOriginalName());
3487 Stream.EmitRecord(bitc::FS_COMBINED_ORIGINAL_NAME, NameVals);
3491 forEachSummary([&](GVInfo I) {
3492 GlobalValueSummary *S = I.second;
3495 assert(hasValueId(I.first));
3496 unsigned ValueId = getValueId(I.first);
3497 SummaryToValueIdMap[S] = ValueId;
3499 if (auto *AS = dyn_cast<AliasSummary>(S)) {
3500 // Will process aliases as a post-pass because the reader wants all
3501 // global to be loaded first.
3502 Aliases.push_back(AS);
3506 if (auto *VS = dyn_cast<GlobalVarSummary>(S)) {
3507 NameVals.push_back(ValueId);
3508 NameVals.push_back(Index.getModuleId(VS->modulePath()));
3509 NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
3510 for (auto &RI : VS->refs()) {
3511 NameVals.push_back(getValueId(RI.getGUID()));
3514 // Emit the finished record.
3515 Stream.EmitRecord(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS, NameVals,
3518 MaybeEmitOriginalName(*S);
3522 auto *FS = cast<FunctionSummary>(S);
3523 writeFunctionTypeMetadataRecords(Stream, FS);
3525 NameVals.push_back(ValueId);
3526 NameVals.push_back(Index.getModuleId(FS->modulePath()));
3527 NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
3528 NameVals.push_back(FS->instCount());
3529 NameVals.push_back(FS->refs().size());
3531 for (auto &RI : FS->refs()) {
3532 NameVals.push_back(getValueId(RI.getGUID()));
3535 bool HasProfileData = false;
3536 for (auto &EI : FS->calls()) {
3537 HasProfileData |= EI.second.Hotness != CalleeInfo::HotnessType::Unknown;
3542 for (auto &EI : FS->calls()) {
3543 // If this GUID doesn't have a value id, it doesn't have a function
3544 // summary and we don't need to record any calls to it.
3545 GlobalValue::GUID GUID = EI.first.getGUID();
3546 if (!hasValueId(GUID)) {
3547 // For SamplePGO, the indirect call targets for local functions will
3548 // have its original name annotated in profile. We try to find the
3549 // corresponding PGOFuncName as the GUID.
3550 GUID = Index.getGUIDFromOriginalID(GUID);
3551 if (GUID == 0 || !hasValueId(GUID))
3554 NameVals.push_back(getValueId(GUID));
3556 NameVals.push_back(static_cast<uint8_t>(EI.second.Hotness));
3559 unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
3561 (HasProfileData ? bitc::FS_COMBINED_PROFILE : bitc::FS_COMBINED);
3563 // Emit the finished record.
3564 Stream.EmitRecord(Code, NameVals, FSAbbrev);
3566 MaybeEmitOriginalName(*S);
3569 for (auto *AS : Aliases) {
3570 auto AliasValueId = SummaryToValueIdMap[AS];
3571 assert(AliasValueId);
3572 NameVals.push_back(AliasValueId);
3573 NameVals.push_back(Index.getModuleId(AS->modulePath()));
3574 NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
3575 auto AliaseeValueId = SummaryToValueIdMap[&AS->getAliasee()];
3576 assert(AliaseeValueId);
3577 NameVals.push_back(AliaseeValueId);
3579 // Emit the finished record.
3580 Stream.EmitRecord(bitc::FS_COMBINED_ALIAS, NameVals, FSAliasAbbrev);
3582 MaybeEmitOriginalName(*AS);
3588 /// Create the "IDENTIFICATION_BLOCK_ID" containing a single string with the
3589 /// current llvm version, and a record for the epoch number.
3590 static void writeIdentificationBlock(BitstreamWriter &Stream) {
3591 Stream.EnterSubblock(bitc::IDENTIFICATION_BLOCK_ID, 5);
3593 // Write the "user readable" string identifying the bitcode producer
3594 auto Abbv = std::make_shared<BitCodeAbbrev>();
3595 Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_STRING));
3596 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
3597 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
3598 auto StringAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3599 writeStringRecord(Stream, bitc::IDENTIFICATION_CODE_STRING,
3600 "LLVM" LLVM_VERSION_STRING, StringAbbrev);
3602 // Write the epoch version
3603 Abbv = std::make_shared<BitCodeAbbrev>();
3604 Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_EPOCH));
3605 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
3606 auto EpochAbbrev = Stream.EmitAbbrev(std::move(Abbv));
3607 SmallVector<unsigned, 1> Vals = {bitc::BITCODE_CURRENT_EPOCH};
3608 Stream.EmitRecord(bitc::IDENTIFICATION_CODE_EPOCH, Vals, EpochAbbrev);
3612 void ModuleBitcodeWriter::writeModuleHash(size_t BlockStartPos) {
3613 // Emit the module's hash.
3614 // MODULE_CODE_HASH: [5*i32]
3618 Hasher.update(ArrayRef<uint8_t>((const uint8_t *)&(Buffer)[BlockStartPos],
3619 Buffer.size() - BlockStartPos));
3620 StringRef Hash = Hasher.result();
3621 for (int Pos = 0; Pos < 20; Pos += 4) {
3622 Vals[Pos / 4] = support::endian::read32be(Hash.data() + Pos);
3625 // Emit the finished record.
3626 Stream.EmitRecord(bitc::MODULE_CODE_HASH, Vals);
3629 // Save the written hash value.
3630 std::copy(std::begin(Vals), std::end(Vals), std::begin(*ModHash));
3632 Stream.EmitRecord(bitc::MODULE_CODE_HASH, ArrayRef<uint32_t>(*ModHash));
3635 void ModuleBitcodeWriter::write() {
3636 writeIdentificationBlock(Stream);
3638 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
3639 size_t BlockStartPos = Buffer.size();
3641 writeModuleVersion();
3643 // Emit blockinfo, which defines the standard abbreviations etc.
3646 // Emit information about attribute groups.
3647 writeAttributeGroupTable();
3649 // Emit information about parameter attributes.
3650 writeAttributeTable();
3652 // Emit information describing all of the types in the module.
3657 // Emit top-level description of module, including target triple, inline asm,
3658 // descriptors for global variables, and function prototype info.
3662 writeModuleConstants();
3664 // Emit metadata kind names.
3665 writeModuleMetadataKinds();
3668 writeModuleMetadata();
3670 // Emit module-level use-lists.
3671 if (VE.shouldPreserveUseListOrder())
3672 writeUseListBlock(nullptr);
3674 writeOperandBundleTags();
3676 // Emit function bodies.
3677 DenseMap<const Function *, uint64_t> FunctionToBitcodeIndex;
3678 for (Module::const_iterator F = M.begin(), E = M.end(); F != E; ++F)
3679 if (!F->isDeclaration())
3680 writeFunction(*F, FunctionToBitcodeIndex);
3682 // Need to write after the above call to WriteFunction which populates
3683 // the summary information in the index.
3685 writePerModuleGlobalValueSummary();
3687 writeGlobalValueSymbolTable(FunctionToBitcodeIndex);
3689 writeModuleHash(BlockStartPos);
3694 static void writeInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
3695 uint32_t &Position) {
3696 support::endian::write32le(&Buffer[Position], Value);
3700 /// If generating a bc file on darwin, we have to emit a
3701 /// header and trailer to make it compatible with the system archiver. To do
3702 /// this we emit the following header, and then emit a trailer that pads the
3703 /// file out to be a multiple of 16 bytes.
3705 /// struct bc_header {
3706 /// uint32_t Magic; // 0x0B17C0DE
3707 /// uint32_t Version; // Version, currently always 0.
3708 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
3709 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
3710 /// uint32_t CPUType; // CPU specifier.
3711 /// ... potentially more later ...
3713 static void emitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
3715 unsigned CPUType = ~0U;
3717 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
3718 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
3719 // number from /usr/include/mach/machine.h. It is ok to reproduce the
3720 // specific constants here because they are implicitly part of the Darwin ABI.
3722 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
3723 DARWIN_CPU_TYPE_X86 = 7,
3724 DARWIN_CPU_TYPE_ARM = 12,
3725 DARWIN_CPU_TYPE_POWERPC = 18
3728 Triple::ArchType Arch = TT.getArch();
3729 if (Arch == Triple::x86_64)
3730 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
3731 else if (Arch == Triple::x86)
3732 CPUType = DARWIN_CPU_TYPE_X86;
3733 else if (Arch == Triple::ppc)
3734 CPUType = DARWIN_CPU_TYPE_POWERPC;
3735 else if (Arch == Triple::ppc64)
3736 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
3737 else if (Arch == Triple::arm || Arch == Triple::thumb)
3738 CPUType = DARWIN_CPU_TYPE_ARM;
3740 // Traditional Bitcode starts after header.
3741 assert(Buffer.size() >= BWH_HeaderSize &&
3742 "Expected header size to be reserved");
3743 unsigned BCOffset = BWH_HeaderSize;
3744 unsigned BCSize = Buffer.size() - BWH_HeaderSize;
3746 // Write the magic and version.
3747 unsigned Position = 0;
3748 writeInt32ToBuffer(0x0B17C0DE, Buffer, Position);
3749 writeInt32ToBuffer(0, Buffer, Position); // Version.
3750 writeInt32ToBuffer(BCOffset, Buffer, Position);
3751 writeInt32ToBuffer(BCSize, Buffer, Position);
3752 writeInt32ToBuffer(CPUType, Buffer, Position);
3754 // If the file is not a multiple of 16 bytes, insert dummy padding.
3755 while (Buffer.size() & 15)
3756 Buffer.push_back(0);
3759 /// Helper to write the header common to all bitcode files.
3760 static void writeBitcodeHeader(BitstreamWriter &Stream) {
3761 // Emit the file header.
3762 Stream.Emit((unsigned)'B', 8);
3763 Stream.Emit((unsigned)'C', 8);
3764 Stream.Emit(0x0, 4);
3765 Stream.Emit(0xC, 4);
3766 Stream.Emit(0xE, 4);
3767 Stream.Emit(0xD, 4);
3770 BitcodeWriter::BitcodeWriter(SmallVectorImpl<char> &Buffer)
3771 : Buffer(Buffer), Stream(new BitstreamWriter(Buffer)) {
3772 writeBitcodeHeader(*Stream);
3775 BitcodeWriter::~BitcodeWriter() { assert(WroteStrtab); }
3777 void BitcodeWriter::writeBlob(unsigned Block, unsigned Record, StringRef Blob) {
3778 Stream->EnterSubblock(Block, 3);
3780 auto Abbv = std::make_shared<BitCodeAbbrev>();
3781 Abbv->Add(BitCodeAbbrevOp(Record));
3782 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3783 auto AbbrevNo = Stream->EmitAbbrev(std::move(Abbv));
3785 Stream->EmitRecordWithBlob(AbbrevNo, ArrayRef<uint64_t>{Record}, Blob);
3787 Stream->ExitBlock();
3790 void BitcodeWriter::writeStrtab() {
3791 assert(!WroteStrtab);
3793 std::vector<char> Strtab;
3794 StrtabBuilder.finalizeInOrder();
3795 Strtab.resize(StrtabBuilder.getSize());
3796 StrtabBuilder.write((uint8_t *)Strtab.data());
3798 writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB,
3799 {Strtab.data(), Strtab.size()});
3804 void BitcodeWriter::copyStrtab(StringRef Strtab) {
3805 writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB, Strtab);
3809 void BitcodeWriter::writeModule(const Module *M,
3810 bool ShouldPreserveUseListOrder,
3811 const ModuleSummaryIndex *Index,
3812 bool GenerateHash, ModuleHash *ModHash) {
3813 ModuleBitcodeWriter ModuleWriter(M, Buffer, StrtabBuilder, *Stream,
3814 ShouldPreserveUseListOrder, Index,
3815 GenerateHash, ModHash);
3816 ModuleWriter.write();
3819 /// WriteBitcodeToFile - Write the specified module to the specified output
3821 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out,
3822 bool ShouldPreserveUseListOrder,
3823 const ModuleSummaryIndex *Index,
3824 bool GenerateHash, ModuleHash *ModHash) {
3825 SmallVector<char, 0> Buffer;
3826 Buffer.reserve(256*1024);
3828 // If this is darwin or another generic macho target, reserve space for the
3830 Triple TT(M->getTargetTriple());
3831 if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
3832 Buffer.insert(Buffer.begin(), BWH_HeaderSize, 0);
3834 BitcodeWriter Writer(Buffer);
3835 Writer.writeModule(M, ShouldPreserveUseListOrder, Index, GenerateHash,
3837 Writer.writeStrtab();
3839 if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
3840 emitDarwinBCHeaderAndTrailer(Buffer, TT);
3842 // Write the generated bitstream to "Out".
3843 Out.write((char*)&Buffer.front(), Buffer.size());
3846 void IndexBitcodeWriter::write() {
3847 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
3849 writeModuleVersion();
3851 // Write the module paths in the combined index.
3854 // Write the summary combined index records.
3855 writeCombinedGlobalValueSummary();
3860 // Write the specified module summary index to the given raw output stream,
3861 // where it will be written in a new bitcode block. This is used when
3862 // writing the combined index file for ThinLTO. When writing a subset of the
3863 // index for a distributed backend, provide a \p ModuleToSummariesForIndex map.
3864 void llvm::WriteIndexToFile(
3865 const ModuleSummaryIndex &Index, raw_ostream &Out,
3866 const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) {
3867 SmallVector<char, 0> Buffer;
3868 Buffer.reserve(256 * 1024);
3870 BitstreamWriter Stream(Buffer);
3871 writeBitcodeHeader(Stream);
3873 IndexBitcodeWriter IndexWriter(Stream, Index, ModuleToSummariesForIndex);
3874 IndexWriter.write();
3876 Out.write((char *)&Buffer.front(), Buffer.size());