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/ReaderWriter.h"
15 #include "ValueEnumerator.h"
16 #include "llvm/ADT/Triple.h"
17 #include "llvm/Bitcode/BitstreamWriter.h"
18 #include "llvm/Bitcode/LLVMBitCodes.h"
19 #include "llvm/IR/Constants.h"
20 #include "llvm/IR/DerivedTypes.h"
21 #include "llvm/IR/InlineAsm.h"
22 #include "llvm/IR/Instructions.h"
23 #include "llvm/IR/Module.h"
24 #include "llvm/IR/Operator.h"
25 #include "llvm/IR/UseListOrder.h"
26 #include "llvm/IR/ValueSymbolTable.h"
27 #include "llvm/Support/CommandLine.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/Program.h"
31 #include "llvm/Support/raw_ostream.h"
36 /// These are manifest constants used by the bitcode writer. They do not need to
37 /// be kept in sync with the reader, but need to be consistent within this file.
39 // VALUE_SYMTAB_BLOCK abbrev id's.
40 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
45 // CONSTANTS_BLOCK abbrev id's.
46 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
47 CONSTANTS_INTEGER_ABBREV,
48 CONSTANTS_CE_CAST_Abbrev,
49 CONSTANTS_NULL_Abbrev,
51 // FUNCTION_BLOCK abbrev id's.
52 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
53 FUNCTION_INST_BINOP_ABBREV,
54 FUNCTION_INST_BINOP_FLAGS_ABBREV,
55 FUNCTION_INST_CAST_ABBREV,
56 FUNCTION_INST_RET_VOID_ABBREV,
57 FUNCTION_INST_RET_VAL_ABBREV,
58 FUNCTION_INST_UNREACHABLE_ABBREV
61 static unsigned GetEncodedCastOpcode(unsigned Opcode) {
63 default: llvm_unreachable("Unknown cast instruction!");
64 case Instruction::Trunc : return bitc::CAST_TRUNC;
65 case Instruction::ZExt : return bitc::CAST_ZEXT;
66 case Instruction::SExt : return bitc::CAST_SEXT;
67 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
68 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
69 case Instruction::UIToFP : return bitc::CAST_UITOFP;
70 case Instruction::SIToFP : return bitc::CAST_SITOFP;
71 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
72 case Instruction::FPExt : return bitc::CAST_FPEXT;
73 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
74 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
75 case Instruction::BitCast : return bitc::CAST_BITCAST;
76 case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST;
80 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) {
82 default: llvm_unreachable("Unknown binary instruction!");
83 case Instruction::Add:
84 case Instruction::FAdd: return bitc::BINOP_ADD;
85 case Instruction::Sub:
86 case Instruction::FSub: return bitc::BINOP_SUB;
87 case Instruction::Mul:
88 case Instruction::FMul: return bitc::BINOP_MUL;
89 case Instruction::UDiv: return bitc::BINOP_UDIV;
90 case Instruction::FDiv:
91 case Instruction::SDiv: return bitc::BINOP_SDIV;
92 case Instruction::URem: return bitc::BINOP_UREM;
93 case Instruction::FRem:
94 case Instruction::SRem: return bitc::BINOP_SREM;
95 case Instruction::Shl: return bitc::BINOP_SHL;
96 case Instruction::LShr: return bitc::BINOP_LSHR;
97 case Instruction::AShr: return bitc::BINOP_ASHR;
98 case Instruction::And: return bitc::BINOP_AND;
99 case Instruction::Or: return bitc::BINOP_OR;
100 case Instruction::Xor: return bitc::BINOP_XOR;
104 static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) {
106 default: llvm_unreachable("Unknown RMW operation!");
107 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG;
108 case AtomicRMWInst::Add: return bitc::RMW_ADD;
109 case AtomicRMWInst::Sub: return bitc::RMW_SUB;
110 case AtomicRMWInst::And: return bitc::RMW_AND;
111 case AtomicRMWInst::Nand: return bitc::RMW_NAND;
112 case AtomicRMWInst::Or: return bitc::RMW_OR;
113 case AtomicRMWInst::Xor: return bitc::RMW_XOR;
114 case AtomicRMWInst::Max: return bitc::RMW_MAX;
115 case AtomicRMWInst::Min: return bitc::RMW_MIN;
116 case AtomicRMWInst::UMax: return bitc::RMW_UMAX;
117 case AtomicRMWInst::UMin: return bitc::RMW_UMIN;
121 static unsigned GetEncodedOrdering(AtomicOrdering Ordering) {
123 case NotAtomic: return bitc::ORDERING_NOTATOMIC;
124 case Unordered: return bitc::ORDERING_UNORDERED;
125 case Monotonic: return bitc::ORDERING_MONOTONIC;
126 case Acquire: return bitc::ORDERING_ACQUIRE;
127 case Release: return bitc::ORDERING_RELEASE;
128 case AcquireRelease: return bitc::ORDERING_ACQREL;
129 case SequentiallyConsistent: return bitc::ORDERING_SEQCST;
131 llvm_unreachable("Invalid ordering");
134 static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) {
135 switch (SynchScope) {
136 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD;
137 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD;
139 llvm_unreachable("Invalid synch scope");
142 static void WriteStringRecord(unsigned Code, StringRef Str,
143 unsigned AbbrevToUse, BitstreamWriter &Stream) {
144 SmallVector<unsigned, 64> Vals;
146 // Code: [strchar x N]
147 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
148 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i]))
150 Vals.push_back(Str[i]);
153 // Emit the finished record.
154 Stream.EmitRecord(Code, Vals, AbbrevToUse);
157 static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
159 case Attribute::Alignment:
160 return bitc::ATTR_KIND_ALIGNMENT;
161 case Attribute::AlwaysInline:
162 return bitc::ATTR_KIND_ALWAYS_INLINE;
163 case Attribute::Builtin:
164 return bitc::ATTR_KIND_BUILTIN;
165 case Attribute::ByVal:
166 return bitc::ATTR_KIND_BY_VAL;
167 case Attribute::InAlloca:
168 return bitc::ATTR_KIND_IN_ALLOCA;
169 case Attribute::Cold:
170 return bitc::ATTR_KIND_COLD;
171 case Attribute::InlineHint:
172 return bitc::ATTR_KIND_INLINE_HINT;
173 case Attribute::InReg:
174 return bitc::ATTR_KIND_IN_REG;
175 case Attribute::JumpTable:
176 return bitc::ATTR_KIND_JUMP_TABLE;
177 case Attribute::MinSize:
178 return bitc::ATTR_KIND_MIN_SIZE;
179 case Attribute::Naked:
180 return bitc::ATTR_KIND_NAKED;
181 case Attribute::Nest:
182 return bitc::ATTR_KIND_NEST;
183 case Attribute::NoAlias:
184 return bitc::ATTR_KIND_NO_ALIAS;
185 case Attribute::NoBuiltin:
186 return bitc::ATTR_KIND_NO_BUILTIN;
187 case Attribute::NoCapture:
188 return bitc::ATTR_KIND_NO_CAPTURE;
189 case Attribute::NoDuplicate:
190 return bitc::ATTR_KIND_NO_DUPLICATE;
191 case Attribute::NoImplicitFloat:
192 return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT;
193 case Attribute::NoInline:
194 return bitc::ATTR_KIND_NO_INLINE;
195 case Attribute::NonLazyBind:
196 return bitc::ATTR_KIND_NON_LAZY_BIND;
197 case Attribute::NonNull:
198 return bitc::ATTR_KIND_NON_NULL;
199 case Attribute::Dereferenceable:
200 return bitc::ATTR_KIND_DEREFERENCEABLE;
201 case Attribute::NoRedZone:
202 return bitc::ATTR_KIND_NO_RED_ZONE;
203 case Attribute::NoReturn:
204 return bitc::ATTR_KIND_NO_RETURN;
205 case Attribute::NoUnwind:
206 return bitc::ATTR_KIND_NO_UNWIND;
207 case Attribute::OptimizeForSize:
208 return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE;
209 case Attribute::OptimizeNone:
210 return bitc::ATTR_KIND_OPTIMIZE_NONE;
211 case Attribute::ReadNone:
212 return bitc::ATTR_KIND_READ_NONE;
213 case Attribute::ReadOnly:
214 return bitc::ATTR_KIND_READ_ONLY;
215 case Attribute::Returned:
216 return bitc::ATTR_KIND_RETURNED;
217 case Attribute::ReturnsTwice:
218 return bitc::ATTR_KIND_RETURNS_TWICE;
219 case Attribute::SExt:
220 return bitc::ATTR_KIND_S_EXT;
221 case Attribute::StackAlignment:
222 return bitc::ATTR_KIND_STACK_ALIGNMENT;
223 case Attribute::StackProtect:
224 return bitc::ATTR_KIND_STACK_PROTECT;
225 case Attribute::StackProtectReq:
226 return bitc::ATTR_KIND_STACK_PROTECT_REQ;
227 case Attribute::StackProtectStrong:
228 return bitc::ATTR_KIND_STACK_PROTECT_STRONG;
229 case Attribute::StructRet:
230 return bitc::ATTR_KIND_STRUCT_RET;
231 case Attribute::SanitizeAddress:
232 return bitc::ATTR_KIND_SANITIZE_ADDRESS;
233 case Attribute::SanitizeThread:
234 return bitc::ATTR_KIND_SANITIZE_THREAD;
235 case Attribute::SanitizeMemory:
236 return bitc::ATTR_KIND_SANITIZE_MEMORY;
237 case Attribute::UWTable:
238 return bitc::ATTR_KIND_UW_TABLE;
239 case Attribute::ZExt:
240 return bitc::ATTR_KIND_Z_EXT;
241 case Attribute::EndAttrKinds:
242 llvm_unreachable("Can not encode end-attribute kinds marker.");
243 case Attribute::None:
244 llvm_unreachable("Can not encode none-attribute.");
247 llvm_unreachable("Trying to encode unknown attribute");
250 static void WriteAttributeGroupTable(const ValueEnumerator &VE,
251 BitstreamWriter &Stream) {
252 const std::vector<AttributeSet> &AttrGrps = VE.getAttributeGroups();
253 if (AttrGrps.empty()) return;
255 Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
257 SmallVector<uint64_t, 64> Record;
258 for (unsigned i = 0, e = AttrGrps.size(); i != e; ++i) {
259 AttributeSet AS = AttrGrps[i];
260 for (unsigned i = 0, e = AS.getNumSlots(); i != e; ++i) {
261 AttributeSet A = AS.getSlotAttributes(i);
263 Record.push_back(VE.getAttributeGroupID(A));
264 Record.push_back(AS.getSlotIndex(i));
266 for (AttributeSet::iterator I = AS.begin(0), E = AS.end(0);
269 if (Attr.isEnumAttribute()) {
271 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
272 } else if (Attr.isIntAttribute()) {
274 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
275 Record.push_back(Attr.getValueAsInt());
277 StringRef Kind = Attr.getKindAsString();
278 StringRef Val = Attr.getValueAsString();
280 Record.push_back(Val.empty() ? 3 : 4);
281 Record.append(Kind.begin(), Kind.end());
284 Record.append(Val.begin(), Val.end());
290 Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
298 static void WriteAttributeTable(const ValueEnumerator &VE,
299 BitstreamWriter &Stream) {
300 const std::vector<AttributeSet> &Attrs = VE.getAttributes();
301 if (Attrs.empty()) return;
303 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
305 SmallVector<uint64_t, 64> Record;
306 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
307 const AttributeSet &A = Attrs[i];
308 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i)
309 Record.push_back(VE.getAttributeGroupID(A.getSlotAttributes(i)));
311 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
318 /// WriteTypeTable - Write out the type table for a module.
319 static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
320 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
322 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
323 SmallVector<uint64_t, 64> TypeVals;
325 uint64_t NumBits = Log2_32_Ceil(VE.getTypes().size()+1);
327 // Abbrev for TYPE_CODE_POINTER.
328 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
329 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
330 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
331 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
332 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
334 // Abbrev for TYPE_CODE_FUNCTION.
335 Abbv = new BitCodeAbbrev();
336 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
337 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
338 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
339 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
341 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
343 // Abbrev for TYPE_CODE_STRUCT_ANON.
344 Abbv = new BitCodeAbbrev();
345 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON));
346 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
347 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
348 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
350 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv);
352 // Abbrev for TYPE_CODE_STRUCT_NAME.
353 Abbv = new BitCodeAbbrev();
354 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
355 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
357 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv);
359 // Abbrev for TYPE_CODE_STRUCT_NAMED.
360 Abbv = new BitCodeAbbrev();
361 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED));
362 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
363 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
364 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
366 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv);
368 // Abbrev for TYPE_CODE_ARRAY.
369 Abbv = new BitCodeAbbrev();
370 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
371 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
372 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
374 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
376 // Emit an entry count so the reader can reserve space.
377 TypeVals.push_back(TypeList.size());
378 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
381 // Loop over all of the types, emitting each in turn.
382 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
383 Type *T = TypeList[i];
387 switch (T->getTypeID()) {
388 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
389 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break;
390 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
391 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
392 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
393 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
394 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
395 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
396 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
397 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break;
398 case Type::IntegerTyID:
400 Code = bitc::TYPE_CODE_INTEGER;
401 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
403 case Type::PointerTyID: {
404 PointerType *PTy = cast<PointerType>(T);
405 // POINTER: [pointee type, address space]
406 Code = bitc::TYPE_CODE_POINTER;
407 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
408 unsigned AddressSpace = PTy->getAddressSpace();
409 TypeVals.push_back(AddressSpace);
410 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
413 case Type::FunctionTyID: {
414 FunctionType *FT = cast<FunctionType>(T);
415 // FUNCTION: [isvararg, retty, paramty x N]
416 Code = bitc::TYPE_CODE_FUNCTION;
417 TypeVals.push_back(FT->isVarArg());
418 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
419 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
420 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
421 AbbrevToUse = FunctionAbbrev;
424 case Type::StructTyID: {
425 StructType *ST = cast<StructType>(T);
426 // STRUCT: [ispacked, eltty x N]
427 TypeVals.push_back(ST->isPacked());
428 // Output all of the element types.
429 for (StructType::element_iterator I = ST->element_begin(),
430 E = ST->element_end(); I != E; ++I)
431 TypeVals.push_back(VE.getTypeID(*I));
433 if (ST->isLiteral()) {
434 Code = bitc::TYPE_CODE_STRUCT_ANON;
435 AbbrevToUse = StructAnonAbbrev;
437 if (ST->isOpaque()) {
438 Code = bitc::TYPE_CODE_OPAQUE;
440 Code = bitc::TYPE_CODE_STRUCT_NAMED;
441 AbbrevToUse = StructNamedAbbrev;
444 // Emit the name if it is present.
445 if (!ST->getName().empty())
446 WriteStringRecord(bitc::TYPE_CODE_STRUCT_NAME, ST->getName(),
447 StructNameAbbrev, Stream);
451 case Type::ArrayTyID: {
452 ArrayType *AT = cast<ArrayType>(T);
453 // ARRAY: [numelts, eltty]
454 Code = bitc::TYPE_CODE_ARRAY;
455 TypeVals.push_back(AT->getNumElements());
456 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
457 AbbrevToUse = ArrayAbbrev;
460 case Type::VectorTyID: {
461 VectorType *VT = cast<VectorType>(T);
462 // VECTOR [numelts, eltty]
463 Code = bitc::TYPE_CODE_VECTOR;
464 TypeVals.push_back(VT->getNumElements());
465 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
470 // Emit the finished record.
471 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
478 static unsigned getEncodedLinkage(const GlobalValue &GV) {
479 switch (GV.getLinkage()) {
480 case GlobalValue::ExternalLinkage:
482 case GlobalValue::WeakAnyLinkage:
484 case GlobalValue::AppendingLinkage:
486 case GlobalValue::InternalLinkage:
488 case GlobalValue::LinkOnceAnyLinkage:
490 case GlobalValue::ExternalWeakLinkage:
492 case GlobalValue::CommonLinkage:
494 case GlobalValue::PrivateLinkage:
496 case GlobalValue::WeakODRLinkage:
498 case GlobalValue::LinkOnceODRLinkage:
500 case GlobalValue::AvailableExternallyLinkage:
503 llvm_unreachable("Invalid linkage");
506 static unsigned getEncodedVisibility(const GlobalValue &GV) {
507 switch (GV.getVisibility()) {
508 case GlobalValue::DefaultVisibility: return 0;
509 case GlobalValue::HiddenVisibility: return 1;
510 case GlobalValue::ProtectedVisibility: return 2;
512 llvm_unreachable("Invalid visibility");
515 static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) {
516 switch (GV.getDLLStorageClass()) {
517 case GlobalValue::DefaultStorageClass: return 0;
518 case GlobalValue::DLLImportStorageClass: return 1;
519 case GlobalValue::DLLExportStorageClass: return 2;
521 llvm_unreachable("Invalid DLL storage class");
524 static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) {
525 switch (GV.getThreadLocalMode()) {
526 case GlobalVariable::NotThreadLocal: return 0;
527 case GlobalVariable::GeneralDynamicTLSModel: return 1;
528 case GlobalVariable::LocalDynamicTLSModel: return 2;
529 case GlobalVariable::InitialExecTLSModel: return 3;
530 case GlobalVariable::LocalExecTLSModel: return 4;
532 llvm_unreachable("Invalid TLS model");
535 static unsigned getEncodedComdatSelectionKind(const Comdat &C) {
536 switch (C.getSelectionKind()) {
538 return bitc::COMDAT_SELECTION_KIND_ANY;
539 case Comdat::ExactMatch:
540 return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH;
541 case Comdat::Largest:
542 return bitc::COMDAT_SELECTION_KIND_LARGEST;
543 case Comdat::NoDuplicates:
544 return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES;
545 case Comdat::SameSize:
546 return bitc::COMDAT_SELECTION_KIND_SAME_SIZE;
548 llvm_unreachable("Invalid selection kind");
551 static void writeComdats(const ValueEnumerator &VE, BitstreamWriter &Stream) {
552 SmallVector<uint16_t, 64> Vals;
553 for (const Comdat *C : VE.getComdats()) {
554 // COMDAT: [selection_kind, name]
555 Vals.push_back(getEncodedComdatSelectionKind(*C));
556 size_t Size = C->getName().size();
557 assert(isUInt<16>(Size));
558 Vals.push_back(Size);
559 for (char Chr : C->getName())
560 Vals.push_back((unsigned char)Chr);
561 Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
566 // Emit top-level description of module, including target triple, inline asm,
567 // descriptors for global variables, and function prototype info.
568 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
569 BitstreamWriter &Stream) {
570 // Emit various pieces of data attached to a module.
571 if (!M->getTargetTriple().empty())
572 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
574 const std::string &DL = M->getDataLayoutStr();
576 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/, Stream);
577 if (!M->getModuleInlineAsm().empty())
578 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
581 // Emit information about sections and GC, computing how many there are. Also
582 // compute the maximum alignment value.
583 std::map<std::string, unsigned> SectionMap;
584 std::map<std::string, unsigned> GCMap;
585 unsigned MaxAlignment = 0;
586 unsigned MaxGlobalType = 0;
587 for (const GlobalValue &GV : M->globals()) {
588 MaxAlignment = std::max(MaxAlignment, GV.getAlignment());
589 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getType()));
590 if (GV.hasSection()) {
591 // Give section names unique ID's.
592 unsigned &Entry = SectionMap[GV.getSection()];
594 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV.getSection(),
596 Entry = SectionMap.size();
600 for (const Function &F : *M) {
601 MaxAlignment = std::max(MaxAlignment, F.getAlignment());
602 if (F.hasSection()) {
603 // Give section names unique ID's.
604 unsigned &Entry = SectionMap[F.getSection()];
606 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F.getSection(),
608 Entry = SectionMap.size();
612 // Same for GC names.
613 unsigned &Entry = GCMap[F.getGC()];
615 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F.getGC(),
617 Entry = GCMap.size();
622 // Emit abbrev for globals, now that we know # sections and max alignment.
623 unsigned SimpleGVarAbbrev = 0;
624 if (!M->global_empty()) {
625 // Add an abbrev for common globals with no visibility or thread localness.
626 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
627 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
628 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
629 Log2_32_Ceil(MaxGlobalType+1)));
630 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
631 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
632 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage.
633 if (MaxAlignment == 0) // Alignment.
634 Abbv->Add(BitCodeAbbrevOp(0));
636 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
637 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
638 Log2_32_Ceil(MaxEncAlignment+1)));
640 if (SectionMap.empty()) // Section.
641 Abbv->Add(BitCodeAbbrevOp(0));
643 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
644 Log2_32_Ceil(SectionMap.size()+1)));
645 // Don't bother emitting vis + thread local.
646 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
649 // Emit the global variable information.
650 SmallVector<unsigned, 64> Vals;
651 for (const GlobalVariable &GV : M->globals()) {
652 unsigned AbbrevToUse = 0;
654 // GLOBALVAR: [type, isconst, initid,
655 // linkage, alignment, section, visibility, threadlocal,
656 // unnamed_addr, externally_initialized, dllstorageclass]
657 Vals.push_back(VE.getTypeID(GV.getType()));
658 Vals.push_back(GV.isConstant());
659 Vals.push_back(GV.isDeclaration() ? 0 :
660 (VE.getValueID(GV.getInitializer()) + 1));
661 Vals.push_back(getEncodedLinkage(GV));
662 Vals.push_back(Log2_32(GV.getAlignment())+1);
663 Vals.push_back(GV.hasSection() ? SectionMap[GV.getSection()] : 0);
664 if (GV.isThreadLocal() ||
665 GV.getVisibility() != GlobalValue::DefaultVisibility ||
666 GV.hasUnnamedAddr() || GV.isExternallyInitialized() ||
667 GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass ||
669 Vals.push_back(getEncodedVisibility(GV));
670 Vals.push_back(getEncodedThreadLocalMode(GV));
671 Vals.push_back(GV.hasUnnamedAddr());
672 Vals.push_back(GV.isExternallyInitialized());
673 Vals.push_back(getEncodedDLLStorageClass(GV));
674 Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0);
676 AbbrevToUse = SimpleGVarAbbrev;
679 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
683 // Emit the function proto information.
684 for (const Function &F : *M) {
685 // FUNCTION: [type, callingconv, isproto, linkage, paramattrs, alignment,
686 // section, visibility, gc, unnamed_addr, prologuedata,
687 // dllstorageclass, comdat, prefixdata]
688 Vals.push_back(VE.getTypeID(F.getType()));
689 Vals.push_back(F.getCallingConv());
690 Vals.push_back(F.isDeclaration());
691 Vals.push_back(getEncodedLinkage(F));
692 Vals.push_back(VE.getAttributeID(F.getAttributes()));
693 Vals.push_back(Log2_32(F.getAlignment())+1);
694 Vals.push_back(F.hasSection() ? SectionMap[F.getSection()] : 0);
695 Vals.push_back(getEncodedVisibility(F));
696 Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0);
697 Vals.push_back(F.hasUnnamedAddr());
698 Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1)
700 Vals.push_back(getEncodedDLLStorageClass(F));
701 Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0);
702 Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1)
705 unsigned AbbrevToUse = 0;
706 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
710 // Emit the alias information.
711 for (const GlobalAlias &A : M->aliases()) {
712 // ALIAS: [alias type, aliasee val#, linkage, visibility]
713 Vals.push_back(VE.getTypeID(A.getType()));
714 Vals.push_back(VE.getValueID(A.getAliasee()));
715 Vals.push_back(getEncodedLinkage(A));
716 Vals.push_back(getEncodedVisibility(A));
717 Vals.push_back(getEncodedDLLStorageClass(A));
718 Vals.push_back(getEncodedThreadLocalMode(A));
719 Vals.push_back(A.hasUnnamedAddr());
720 unsigned AbbrevToUse = 0;
721 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
726 static uint64_t GetOptimizationFlags(const Value *V) {
729 if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) {
730 if (OBO->hasNoSignedWrap())
731 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
732 if (OBO->hasNoUnsignedWrap())
733 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
734 } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) {
736 Flags |= 1 << bitc::PEO_EXACT;
737 } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) {
738 if (FPMO->hasUnsafeAlgebra())
739 Flags |= FastMathFlags::UnsafeAlgebra;
740 if (FPMO->hasNoNaNs())
741 Flags |= FastMathFlags::NoNaNs;
742 if (FPMO->hasNoInfs())
743 Flags |= FastMathFlags::NoInfs;
744 if (FPMO->hasNoSignedZeros())
745 Flags |= FastMathFlags::NoSignedZeros;
746 if (FPMO->hasAllowReciprocal())
747 Flags |= FastMathFlags::AllowReciprocal;
753 static void WriteValueAsMetadata(const ValueAsMetadata *MD,
754 const ValueEnumerator &VE,
755 BitstreamWriter &Stream,
756 SmallVectorImpl<uint64_t> &Record) {
757 // Mimic an MDNode with a value as one operand.
758 Value *V = MD->getValue();
759 Record.push_back(VE.getTypeID(V->getType()));
760 Record.push_back(VE.getValueID(V));
761 Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0);
765 static void WriteMDTuple(const MDTuple *N, const ValueEnumerator &VE,
766 BitstreamWriter &Stream,
767 SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) {
768 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
769 Metadata *MD = N->getOperand(i);
770 assert(!(MD && isa<LocalAsMetadata>(MD)) &&
771 "Unexpected function-local metadata");
772 Record.push_back(VE.getMetadataOrNullID(MD));
774 Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
775 : bitc::METADATA_NODE,
780 static void WriteMDLocation(const MDLocation *N, const ValueEnumerator &VE,
781 BitstreamWriter &Stream,
782 SmallVectorImpl<uint64_t> &Record,
784 Record.push_back(N->isDistinct());
785 Record.push_back(N->getLine());
786 Record.push_back(N->getColumn());
787 Record.push_back(VE.getMetadataID(N->getScope()));
788 Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt()));
790 Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
794 static void WriteGenericDebugNode(const GenericDebugNode *,
795 const ValueEnumerator &, BitstreamWriter &,
796 SmallVectorImpl<uint64_t> &, unsigned) {
797 llvm_unreachable("unimplemented");
800 static void WriteModuleMetadata(const Module *M,
801 const ValueEnumerator &VE,
802 BitstreamWriter &Stream) {
803 const auto &MDs = VE.getMDs();
804 if (MDs.empty() && M->named_metadata_empty())
807 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
809 unsigned MDSAbbrev = 0;
810 if (VE.hasMDString()) {
811 // Abbrev for METADATA_STRING.
812 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
813 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
814 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
815 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
816 MDSAbbrev = Stream.EmitAbbrev(Abbv);
819 unsigned MDLocationAbbrev = 0;
820 if (VE.hasMDLocation()) {
821 // Abbrev for METADATA_LOCATION.
823 // Assume the column is usually under 128, and always output the inlined-at
824 // location (it's never more expensive than building an array size 1).
825 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
826 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION));
827 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
828 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
829 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
830 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
831 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
832 MDLocationAbbrev = Stream.EmitAbbrev(Abbv);
835 unsigned NameAbbrev = 0;
836 if (!M->named_metadata_empty()) {
837 // Abbrev for METADATA_NAME.
838 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
839 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME));
840 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
841 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
842 NameAbbrev = Stream.EmitAbbrev(Abbv);
845 unsigned MDTupleAbbrev = 0;
846 unsigned GenericDebugNodeAbbrev = 0;
847 SmallVector<uint64_t, 64> Record;
848 for (const Metadata *MD : MDs) {
849 if (const MDNode *N = dyn_cast<MDNode>(MD)) {
850 switch (N->getMetadataID()) {
852 llvm_unreachable("Invalid MDNode subclass");
853 #define HANDLE_MDNODE_LEAF(CLASS) \
854 case Metadata::CLASS##Kind: \
855 Write##CLASS(cast<CLASS>(N), VE, Stream, Record, CLASS##Abbrev); \
857 #include "llvm/IR/Metadata.def"
860 if (const auto *MDC = dyn_cast<ConstantAsMetadata>(MD)) {
861 WriteValueAsMetadata(MDC, VE, Stream, Record);
864 const MDString *MDS = cast<MDString>(MD);
865 // Code: [strchar x N]
866 Record.append(MDS->bytes_begin(), MDS->bytes_end());
868 // Emit the finished record.
869 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
873 // Write named metadata.
874 for (const NamedMDNode &NMD : M->named_metadata()) {
876 StringRef Str = NMD.getName();
877 Record.append(Str.bytes_begin(), Str.bytes_end());
878 Stream.EmitRecord(bitc::METADATA_NAME, Record, NameAbbrev);
881 // Write named metadata operands.
882 for (const MDNode *N : NMD.operands())
883 Record.push_back(VE.getMetadataID(N));
884 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
891 static void WriteFunctionLocalMetadata(const Function &F,
892 const ValueEnumerator &VE,
893 BitstreamWriter &Stream) {
894 bool StartedMetadataBlock = false;
895 SmallVector<uint64_t, 64> Record;
896 const SmallVectorImpl<const LocalAsMetadata *> &MDs =
897 VE.getFunctionLocalMDs();
898 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
899 assert(MDs[i] && "Expected valid function-local metadata");
900 if (!StartedMetadataBlock) {
901 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
902 StartedMetadataBlock = true;
904 WriteValueAsMetadata(MDs[i], VE, Stream, Record);
907 if (StartedMetadataBlock)
911 static void WriteMetadataAttachment(const Function &F,
912 const ValueEnumerator &VE,
913 BitstreamWriter &Stream) {
914 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
916 SmallVector<uint64_t, 64> Record;
918 // Write metadata attachments
919 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
920 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
922 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
923 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
926 I->getAllMetadataOtherThanDebugLoc(MDs);
928 // If no metadata, ignore instruction.
929 if (MDs.empty()) continue;
931 Record.push_back(VE.getInstructionID(I));
933 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
934 Record.push_back(MDs[i].first);
935 Record.push_back(VE.getMetadataID(MDs[i].second));
937 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
944 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
945 SmallVector<uint64_t, 64> Record;
947 // Write metadata kinds
948 // METADATA_KIND - [n x [id, name]]
949 SmallVector<StringRef, 8> Names;
950 M->getMDKindNames(Names);
952 if (Names.empty()) return;
954 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
956 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
957 Record.push_back(MDKindID);
958 StringRef KName = Names[MDKindID];
959 Record.append(KName.begin(), KName.end());
961 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
968 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
970 Vals.push_back(V << 1);
972 Vals.push_back((-V << 1) | 1);
975 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
976 const ValueEnumerator &VE,
977 BitstreamWriter &Stream, bool isGlobal) {
978 if (FirstVal == LastVal) return;
980 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
982 unsigned AggregateAbbrev = 0;
983 unsigned String8Abbrev = 0;
984 unsigned CString7Abbrev = 0;
985 unsigned CString6Abbrev = 0;
986 // If this is a constant pool for the module, emit module-specific abbrevs.
988 // Abbrev for CST_CODE_AGGREGATE.
989 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
990 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
991 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
992 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
993 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
995 // Abbrev for CST_CODE_STRING.
996 Abbv = new BitCodeAbbrev();
997 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
998 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
999 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1000 String8Abbrev = Stream.EmitAbbrev(Abbv);
1001 // Abbrev for CST_CODE_CSTRING.
1002 Abbv = new BitCodeAbbrev();
1003 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
1004 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1005 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1006 CString7Abbrev = Stream.EmitAbbrev(Abbv);
1007 // Abbrev for CST_CODE_CSTRING.
1008 Abbv = new BitCodeAbbrev();
1009 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
1010 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1011 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1012 CString6Abbrev = Stream.EmitAbbrev(Abbv);
1015 SmallVector<uint64_t, 64> Record;
1017 const ValueEnumerator::ValueList &Vals = VE.getValues();
1018 Type *LastTy = nullptr;
1019 for (unsigned i = FirstVal; i != LastVal; ++i) {
1020 const Value *V = Vals[i].first;
1021 // If we need to switch types, do so now.
1022 if (V->getType() != LastTy) {
1023 LastTy = V->getType();
1024 Record.push_back(VE.getTypeID(LastTy));
1025 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
1026 CONSTANTS_SETTYPE_ABBREV);
1030 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
1031 Record.push_back(unsigned(IA->hasSideEffects()) |
1032 unsigned(IA->isAlignStack()) << 1 |
1033 unsigned(IA->getDialect()&1) << 2);
1035 // Add the asm string.
1036 const std::string &AsmStr = IA->getAsmString();
1037 Record.push_back(AsmStr.size());
1038 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
1039 Record.push_back(AsmStr[i]);
1041 // Add the constraint string.
1042 const std::string &ConstraintStr = IA->getConstraintString();
1043 Record.push_back(ConstraintStr.size());
1044 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
1045 Record.push_back(ConstraintStr[i]);
1046 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
1050 const Constant *C = cast<Constant>(V);
1051 unsigned Code = -1U;
1052 unsigned AbbrevToUse = 0;
1053 if (C->isNullValue()) {
1054 Code = bitc::CST_CODE_NULL;
1055 } else if (isa<UndefValue>(C)) {
1056 Code = bitc::CST_CODE_UNDEF;
1057 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
1058 if (IV->getBitWidth() <= 64) {
1059 uint64_t V = IV->getSExtValue();
1060 emitSignedInt64(Record, V);
1061 Code = bitc::CST_CODE_INTEGER;
1062 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
1063 } else { // Wide integers, > 64 bits in size.
1064 // We have an arbitrary precision integer value to write whose
1065 // bit width is > 64. However, in canonical unsigned integer
1066 // format it is likely that the high bits are going to be zero.
1067 // So, we only write the number of active words.
1068 unsigned NWords = IV->getValue().getActiveWords();
1069 const uint64_t *RawWords = IV->getValue().getRawData();
1070 for (unsigned i = 0; i != NWords; ++i) {
1071 emitSignedInt64(Record, RawWords[i]);
1073 Code = bitc::CST_CODE_WIDE_INTEGER;
1075 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
1076 Code = bitc::CST_CODE_FLOAT;
1077 Type *Ty = CFP->getType();
1078 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) {
1079 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
1080 } else if (Ty->isX86_FP80Ty()) {
1081 // api needed to prevent premature destruction
1082 // bits are not in the same order as a normal i80 APInt, compensate.
1083 APInt api = CFP->getValueAPF().bitcastToAPInt();
1084 const uint64_t *p = api.getRawData();
1085 Record.push_back((p[1] << 48) | (p[0] >> 16));
1086 Record.push_back(p[0] & 0xffffLL);
1087 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
1088 APInt api = CFP->getValueAPF().bitcastToAPInt();
1089 const uint64_t *p = api.getRawData();
1090 Record.push_back(p[0]);
1091 Record.push_back(p[1]);
1093 assert (0 && "Unknown FP type!");
1095 } else if (isa<ConstantDataSequential>(C) &&
1096 cast<ConstantDataSequential>(C)->isString()) {
1097 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
1098 // Emit constant strings specially.
1099 unsigned NumElts = Str->getNumElements();
1100 // If this is a null-terminated string, use the denser CSTRING encoding.
1101 if (Str->isCString()) {
1102 Code = bitc::CST_CODE_CSTRING;
1103 --NumElts; // Don't encode the null, which isn't allowed by char6.
1105 Code = bitc::CST_CODE_STRING;
1106 AbbrevToUse = String8Abbrev;
1108 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
1109 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
1110 for (unsigned i = 0; i != NumElts; ++i) {
1111 unsigned char V = Str->getElementAsInteger(i);
1112 Record.push_back(V);
1113 isCStr7 &= (V & 128) == 0;
1115 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
1119 AbbrevToUse = CString6Abbrev;
1121 AbbrevToUse = CString7Abbrev;
1122 } else if (const ConstantDataSequential *CDS =
1123 dyn_cast<ConstantDataSequential>(C)) {
1124 Code = bitc::CST_CODE_DATA;
1125 Type *EltTy = CDS->getType()->getElementType();
1126 if (isa<IntegerType>(EltTy)) {
1127 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
1128 Record.push_back(CDS->getElementAsInteger(i));
1129 } else if (EltTy->isFloatTy()) {
1130 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1131 union { float F; uint32_t I; };
1132 F = CDS->getElementAsFloat(i);
1133 Record.push_back(I);
1136 assert(EltTy->isDoubleTy() && "Unknown ConstantData element type");
1137 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1138 union { double F; uint64_t I; };
1139 F = CDS->getElementAsDouble(i);
1140 Record.push_back(I);
1143 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) ||
1144 isa<ConstantVector>(C)) {
1145 Code = bitc::CST_CODE_AGGREGATE;
1146 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
1147 Record.push_back(VE.getValueID(C->getOperand(i)));
1148 AbbrevToUse = AggregateAbbrev;
1149 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
1150 switch (CE->getOpcode()) {
1152 if (Instruction::isCast(CE->getOpcode())) {
1153 Code = bitc::CST_CODE_CE_CAST;
1154 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
1155 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1156 Record.push_back(VE.getValueID(C->getOperand(0)));
1157 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
1159 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
1160 Code = bitc::CST_CODE_CE_BINOP;
1161 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
1162 Record.push_back(VE.getValueID(C->getOperand(0)));
1163 Record.push_back(VE.getValueID(C->getOperand(1)));
1164 uint64_t Flags = GetOptimizationFlags(CE);
1166 Record.push_back(Flags);
1169 case Instruction::GetElementPtr:
1170 Code = bitc::CST_CODE_CE_GEP;
1171 if (cast<GEPOperator>(C)->isInBounds())
1172 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
1173 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
1174 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
1175 Record.push_back(VE.getValueID(C->getOperand(i)));
1178 case Instruction::Select:
1179 Code = bitc::CST_CODE_CE_SELECT;
1180 Record.push_back(VE.getValueID(C->getOperand(0)));
1181 Record.push_back(VE.getValueID(C->getOperand(1)));
1182 Record.push_back(VE.getValueID(C->getOperand(2)));
1184 case Instruction::ExtractElement:
1185 Code = bitc::CST_CODE_CE_EXTRACTELT;
1186 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1187 Record.push_back(VE.getValueID(C->getOperand(0)));
1188 Record.push_back(VE.getTypeID(C->getOperand(1)->getType()));
1189 Record.push_back(VE.getValueID(C->getOperand(1)));
1191 case Instruction::InsertElement:
1192 Code = bitc::CST_CODE_CE_INSERTELT;
1193 Record.push_back(VE.getValueID(C->getOperand(0)));
1194 Record.push_back(VE.getValueID(C->getOperand(1)));
1195 Record.push_back(VE.getTypeID(C->getOperand(2)->getType()));
1196 Record.push_back(VE.getValueID(C->getOperand(2)));
1198 case Instruction::ShuffleVector:
1199 // If the return type and argument types are the same, this is a
1200 // standard shufflevector instruction. If the types are different,
1201 // then the shuffle is widening or truncating the input vectors, and
1202 // the argument type must also be encoded.
1203 if (C->getType() == C->getOperand(0)->getType()) {
1204 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
1206 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
1207 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1209 Record.push_back(VE.getValueID(C->getOperand(0)));
1210 Record.push_back(VE.getValueID(C->getOperand(1)));
1211 Record.push_back(VE.getValueID(C->getOperand(2)));
1213 case Instruction::ICmp:
1214 case Instruction::FCmp:
1215 Code = bitc::CST_CODE_CE_CMP;
1216 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1217 Record.push_back(VE.getValueID(C->getOperand(0)));
1218 Record.push_back(VE.getValueID(C->getOperand(1)));
1219 Record.push_back(CE->getPredicate());
1222 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
1223 Code = bitc::CST_CODE_BLOCKADDRESS;
1224 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
1225 Record.push_back(VE.getValueID(BA->getFunction()));
1226 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
1231 llvm_unreachable("Unknown constant!");
1233 Stream.EmitRecord(Code, Record, AbbrevToUse);
1240 static void WriteModuleConstants(const ValueEnumerator &VE,
1241 BitstreamWriter &Stream) {
1242 const ValueEnumerator::ValueList &Vals = VE.getValues();
1244 // Find the first constant to emit, which is the first non-globalvalue value.
1245 // We know globalvalues have been emitted by WriteModuleInfo.
1246 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
1247 if (!isa<GlobalValue>(Vals[i].first)) {
1248 WriteConstants(i, Vals.size(), VE, Stream, true);
1254 /// PushValueAndType - The file has to encode both the value and type id for
1255 /// many values, because we need to know what type to create for forward
1256 /// references. However, most operands are not forward references, so this type
1257 /// field is not needed.
1259 /// This function adds V's value ID to Vals. If the value ID is higher than the
1260 /// instruction ID, then it is a forward reference, and it also includes the
1261 /// type ID. The value ID that is written is encoded relative to the InstID.
1262 static bool PushValueAndType(const Value *V, unsigned InstID,
1263 SmallVectorImpl<unsigned> &Vals,
1264 ValueEnumerator &VE) {
1265 unsigned ValID = VE.getValueID(V);
1266 // Make encoding relative to the InstID.
1267 Vals.push_back(InstID - ValID);
1268 if (ValID >= InstID) {
1269 Vals.push_back(VE.getTypeID(V->getType()));
1275 /// pushValue - Like PushValueAndType, but where the type of the value is
1276 /// omitted (perhaps it was already encoded in an earlier operand).
1277 static void pushValue(const Value *V, unsigned InstID,
1278 SmallVectorImpl<unsigned> &Vals,
1279 ValueEnumerator &VE) {
1280 unsigned ValID = VE.getValueID(V);
1281 Vals.push_back(InstID - ValID);
1284 static void pushValueSigned(const Value *V, unsigned InstID,
1285 SmallVectorImpl<uint64_t> &Vals,
1286 ValueEnumerator &VE) {
1287 unsigned ValID = VE.getValueID(V);
1288 int64_t diff = ((int32_t)InstID - (int32_t)ValID);
1289 emitSignedInt64(Vals, diff);
1292 /// WriteInstruction - Emit an instruction to the specified stream.
1293 static void WriteInstruction(const Instruction &I, unsigned InstID,
1294 ValueEnumerator &VE, BitstreamWriter &Stream,
1295 SmallVectorImpl<unsigned> &Vals) {
1297 unsigned AbbrevToUse = 0;
1298 VE.setInstructionID(&I);
1299 switch (I.getOpcode()) {
1301 if (Instruction::isCast(I.getOpcode())) {
1302 Code = bitc::FUNC_CODE_INST_CAST;
1303 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1304 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
1305 Vals.push_back(VE.getTypeID(I.getType()));
1306 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
1308 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
1309 Code = bitc::FUNC_CODE_INST_BINOP;
1310 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1311 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
1312 pushValue(I.getOperand(1), InstID, Vals, VE);
1313 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
1314 uint64_t Flags = GetOptimizationFlags(&I);
1316 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
1317 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
1318 Vals.push_back(Flags);
1323 case Instruction::GetElementPtr:
1324 Code = bitc::FUNC_CODE_INST_GEP;
1325 if (cast<GEPOperator>(&I)->isInBounds())
1326 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP;
1327 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1328 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1330 case Instruction::ExtractValue: {
1331 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
1332 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1333 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
1334 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
1338 case Instruction::InsertValue: {
1339 Code = bitc::FUNC_CODE_INST_INSERTVAL;
1340 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1341 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1342 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
1343 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
1347 case Instruction::Select:
1348 Code = bitc::FUNC_CODE_INST_VSELECT;
1349 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1350 pushValue(I.getOperand(2), InstID, Vals, VE);
1351 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1353 case Instruction::ExtractElement:
1354 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
1355 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1356 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1358 case Instruction::InsertElement:
1359 Code = bitc::FUNC_CODE_INST_INSERTELT;
1360 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1361 pushValue(I.getOperand(1), InstID, Vals, VE);
1362 PushValueAndType(I.getOperand(2), InstID, Vals, VE);
1364 case Instruction::ShuffleVector:
1365 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
1366 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1367 pushValue(I.getOperand(1), InstID, Vals, VE);
1368 pushValue(I.getOperand(2), InstID, Vals, VE);
1370 case Instruction::ICmp:
1371 case Instruction::FCmp:
1372 // compare returning Int1Ty or vector of Int1Ty
1373 Code = bitc::FUNC_CODE_INST_CMP2;
1374 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1375 pushValue(I.getOperand(1), InstID, Vals, VE);
1376 Vals.push_back(cast<CmpInst>(I).getPredicate());
1379 case Instruction::Ret:
1381 Code = bitc::FUNC_CODE_INST_RET;
1382 unsigned NumOperands = I.getNumOperands();
1383 if (NumOperands == 0)
1384 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
1385 else if (NumOperands == 1) {
1386 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1387 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
1389 for (unsigned i = 0, e = NumOperands; i != e; ++i)
1390 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1394 case Instruction::Br:
1396 Code = bitc::FUNC_CODE_INST_BR;
1397 const BranchInst &II = cast<BranchInst>(I);
1398 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
1399 if (II.isConditional()) {
1400 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
1401 pushValue(II.getCondition(), InstID, Vals, VE);
1405 case Instruction::Switch:
1407 Code = bitc::FUNC_CODE_INST_SWITCH;
1408 const SwitchInst &SI = cast<SwitchInst>(I);
1409 Vals.push_back(VE.getTypeID(SI.getCondition()->getType()));
1410 pushValue(SI.getCondition(), InstID, Vals, VE);
1411 Vals.push_back(VE.getValueID(SI.getDefaultDest()));
1412 for (SwitchInst::ConstCaseIt i = SI.case_begin(), e = SI.case_end();
1414 Vals.push_back(VE.getValueID(i.getCaseValue()));
1415 Vals.push_back(VE.getValueID(i.getCaseSuccessor()));
1419 case Instruction::IndirectBr:
1420 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
1421 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1422 // Encode the address operand as relative, but not the basic blocks.
1423 pushValue(I.getOperand(0), InstID, Vals, VE);
1424 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i)
1425 Vals.push_back(VE.getValueID(I.getOperand(i)));
1428 case Instruction::Invoke: {
1429 const InvokeInst *II = cast<InvokeInst>(&I);
1430 const Value *Callee(II->getCalledValue());
1431 PointerType *PTy = cast<PointerType>(Callee->getType());
1432 FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1433 Code = bitc::FUNC_CODE_INST_INVOKE;
1435 Vals.push_back(VE.getAttributeID(II->getAttributes()));
1436 Vals.push_back(II->getCallingConv());
1437 Vals.push_back(VE.getValueID(II->getNormalDest()));
1438 Vals.push_back(VE.getValueID(II->getUnwindDest()));
1439 PushValueAndType(Callee, InstID, Vals, VE);
1441 // Emit value #'s for the fixed parameters.
1442 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1443 pushValue(I.getOperand(i), InstID, Vals, VE); // fixed param.
1445 // Emit type/value pairs for varargs params.
1446 if (FTy->isVarArg()) {
1447 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3;
1449 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
1453 case Instruction::Resume:
1454 Code = bitc::FUNC_CODE_INST_RESUME;
1455 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1457 case Instruction::Unreachable:
1458 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
1459 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
1462 case Instruction::PHI: {
1463 const PHINode &PN = cast<PHINode>(I);
1464 Code = bitc::FUNC_CODE_INST_PHI;
1465 // With the newer instruction encoding, forward references could give
1466 // negative valued IDs. This is most common for PHIs, so we use
1468 SmallVector<uint64_t, 128> Vals64;
1469 Vals64.push_back(VE.getTypeID(PN.getType()));
1470 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
1471 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64, VE);
1472 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i)));
1474 // Emit a Vals64 vector and exit.
1475 Stream.EmitRecord(Code, Vals64, AbbrevToUse);
1480 case Instruction::LandingPad: {
1481 const LandingPadInst &LP = cast<LandingPadInst>(I);
1482 Code = bitc::FUNC_CODE_INST_LANDINGPAD;
1483 Vals.push_back(VE.getTypeID(LP.getType()));
1484 PushValueAndType(LP.getPersonalityFn(), InstID, Vals, VE);
1485 Vals.push_back(LP.isCleanup());
1486 Vals.push_back(LP.getNumClauses());
1487 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) {
1489 Vals.push_back(LandingPadInst::Catch);
1491 Vals.push_back(LandingPadInst::Filter);
1492 PushValueAndType(LP.getClause(I), InstID, Vals, VE);
1497 case Instruction::Alloca: {
1498 Code = bitc::FUNC_CODE_INST_ALLOCA;
1499 Vals.push_back(VE.getTypeID(I.getType()));
1500 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1501 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1502 const AllocaInst &AI = cast<AllocaInst>(I);
1503 unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1;
1504 assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 &&
1505 "not enough bits for maximum alignment");
1506 assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64");
1507 AlignRecord |= AI.isUsedWithInAlloca() << 5;
1508 Vals.push_back(AlignRecord);
1512 case Instruction::Load:
1513 if (cast<LoadInst>(I).isAtomic()) {
1514 Code = bitc::FUNC_CODE_INST_LOADATOMIC;
1515 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1517 Code = bitc::FUNC_CODE_INST_LOAD;
1518 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1519 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1521 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1522 Vals.push_back(cast<LoadInst>(I).isVolatile());
1523 if (cast<LoadInst>(I).isAtomic()) {
1524 Vals.push_back(GetEncodedOrdering(cast<LoadInst>(I).getOrdering()));
1525 Vals.push_back(GetEncodedSynchScope(cast<LoadInst>(I).getSynchScope()));
1528 case Instruction::Store:
1529 if (cast<StoreInst>(I).isAtomic())
1530 Code = bitc::FUNC_CODE_INST_STOREATOMIC;
1532 Code = bitc::FUNC_CODE_INST_STORE;
1533 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1534 pushValue(I.getOperand(0), InstID, Vals, VE); // val.
1535 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1536 Vals.push_back(cast<StoreInst>(I).isVolatile());
1537 if (cast<StoreInst>(I).isAtomic()) {
1538 Vals.push_back(GetEncodedOrdering(cast<StoreInst>(I).getOrdering()));
1539 Vals.push_back(GetEncodedSynchScope(cast<StoreInst>(I).getSynchScope()));
1542 case Instruction::AtomicCmpXchg:
1543 Code = bitc::FUNC_CODE_INST_CMPXCHG;
1544 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr
1545 pushValue(I.getOperand(1), InstID, Vals, VE); // cmp.
1546 pushValue(I.getOperand(2), InstID, Vals, VE); // newval.
1547 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile());
1548 Vals.push_back(GetEncodedOrdering(
1549 cast<AtomicCmpXchgInst>(I).getSuccessOrdering()));
1550 Vals.push_back(GetEncodedSynchScope(
1551 cast<AtomicCmpXchgInst>(I).getSynchScope()));
1552 Vals.push_back(GetEncodedOrdering(
1553 cast<AtomicCmpXchgInst>(I).getFailureOrdering()));
1554 Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak());
1556 case Instruction::AtomicRMW:
1557 Code = bitc::FUNC_CODE_INST_ATOMICRMW;
1558 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr
1559 pushValue(I.getOperand(1), InstID, Vals, VE); // val.
1560 Vals.push_back(GetEncodedRMWOperation(
1561 cast<AtomicRMWInst>(I).getOperation()));
1562 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile());
1563 Vals.push_back(GetEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering()));
1564 Vals.push_back(GetEncodedSynchScope(
1565 cast<AtomicRMWInst>(I).getSynchScope()));
1567 case Instruction::Fence:
1568 Code = bitc::FUNC_CODE_INST_FENCE;
1569 Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering()));
1570 Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope()));
1572 case Instruction::Call: {
1573 const CallInst &CI = cast<CallInst>(I);
1574 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
1575 FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1577 Code = bitc::FUNC_CODE_INST_CALL;
1579 Vals.push_back(VE.getAttributeID(CI.getAttributes()));
1580 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()) |
1581 unsigned(CI.isMustTailCall()) << 14);
1582 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee
1584 // Emit value #'s for the fixed parameters.
1585 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) {
1586 // Check for labels (can happen with asm labels).
1587 if (FTy->getParamType(i)->isLabelTy())
1588 Vals.push_back(VE.getValueID(CI.getArgOperand(i)));
1590 pushValue(CI.getArgOperand(i), InstID, Vals, VE); // fixed param.
1593 // Emit type/value pairs for varargs params.
1594 if (FTy->isVarArg()) {
1595 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
1597 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs
1601 case Instruction::VAArg:
1602 Code = bitc::FUNC_CODE_INST_VAARG;
1603 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
1604 pushValue(I.getOperand(0), InstID, Vals, VE); // valist.
1605 Vals.push_back(VE.getTypeID(I.getType())); // restype.
1609 Stream.EmitRecord(Code, Vals, AbbrevToUse);
1613 // Emit names for globals/functions etc.
1614 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
1615 const ValueEnumerator &VE,
1616 BitstreamWriter &Stream) {
1617 if (VST.empty()) return;
1618 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
1620 // FIXME: Set up the abbrev, we know how many values there are!
1621 // FIXME: We know if the type names can use 7-bit ascii.
1622 SmallVector<unsigned, 64> NameVals;
1624 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
1627 const ValueName &Name = *SI;
1629 // Figure out the encoding to use for the name.
1631 bool isChar6 = true;
1632 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
1635 isChar6 = BitCodeAbbrevOp::isChar6(*C);
1636 if ((unsigned char)*C & 128) {
1638 break; // don't bother scanning the rest.
1642 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
1644 // VST_ENTRY: [valueid, namechar x N]
1645 // VST_BBENTRY: [bbid, namechar x N]
1647 if (isa<BasicBlock>(SI->getValue())) {
1648 Code = bitc::VST_CODE_BBENTRY;
1650 AbbrevToUse = VST_BBENTRY_6_ABBREV;
1652 Code = bitc::VST_CODE_ENTRY;
1654 AbbrevToUse = VST_ENTRY_6_ABBREV;
1656 AbbrevToUse = VST_ENTRY_7_ABBREV;
1659 NameVals.push_back(VE.getValueID(SI->getValue()));
1660 for (const char *P = Name.getKeyData(),
1661 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
1662 NameVals.push_back((unsigned char)*P);
1664 // Emit the finished record.
1665 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
1671 static void WriteUseList(ValueEnumerator &VE, UseListOrder &&Order,
1672 BitstreamWriter &Stream) {
1673 assert(Order.Shuffle.size() >= 2 && "Shuffle too small");
1675 if (isa<BasicBlock>(Order.V))
1676 Code = bitc::USELIST_CODE_BB;
1678 Code = bitc::USELIST_CODE_DEFAULT;
1680 SmallVector<uint64_t, 64> Record;
1681 for (unsigned I : Order.Shuffle)
1682 Record.push_back(I);
1683 Record.push_back(VE.getValueID(Order.V));
1684 Stream.EmitRecord(Code, Record);
1687 static void WriteUseListBlock(const Function *F, ValueEnumerator &VE,
1688 BitstreamWriter &Stream) {
1689 auto hasMore = [&]() {
1690 return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
1696 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
1698 WriteUseList(VE, std::move(VE.UseListOrders.back()), Stream);
1699 VE.UseListOrders.pop_back();
1704 /// WriteFunction - Emit a function body to the module stream.
1705 static void WriteFunction(const Function &F, ValueEnumerator &VE,
1706 BitstreamWriter &Stream) {
1707 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
1708 VE.incorporateFunction(F);
1710 SmallVector<unsigned, 64> Vals;
1712 // Emit the number of basic blocks, so the reader can create them ahead of
1714 Vals.push_back(VE.getBasicBlocks().size());
1715 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
1718 // If there are function-local constants, emit them now.
1719 unsigned CstStart, CstEnd;
1720 VE.getFunctionConstantRange(CstStart, CstEnd);
1721 WriteConstants(CstStart, CstEnd, VE, Stream, false);
1723 // If there is function-local metadata, emit it now.
1724 WriteFunctionLocalMetadata(F, VE, Stream);
1726 // Keep a running idea of what the instruction ID is.
1727 unsigned InstID = CstEnd;
1729 bool NeedsMetadataAttachment = false;
1733 // Finally, emit all the instructions, in order.
1734 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
1735 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
1737 WriteInstruction(*I, InstID, VE, Stream, Vals);
1739 if (!I->getType()->isVoidTy())
1742 // If the instruction has metadata, write a metadata attachment later.
1743 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
1745 // If the instruction has a debug location, emit it.
1746 DebugLoc DL = I->getDebugLoc();
1747 if (DL.isUnknown()) {
1749 } else if (DL == LastDL) {
1750 // Just repeat the same debug loc as last time.
1751 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
1754 DL.getScopeAndInlinedAt(Scope, IA, I->getContext());
1755 assert(Scope && "Expected valid scope");
1757 Vals.push_back(DL.getLine());
1758 Vals.push_back(DL.getCol());
1759 Vals.push_back(VE.getMetadataOrNullID(Scope));
1760 Vals.push_back(VE.getMetadataOrNullID(IA));
1761 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
1768 // Emit names for all the instructions etc.
1769 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1771 if (NeedsMetadataAttachment)
1772 WriteMetadataAttachment(F, VE, Stream);
1773 if (shouldPreserveBitcodeUseListOrder())
1774 WriteUseListBlock(&F, VE, Stream);
1779 // Emit blockinfo, which defines the standard abbreviations etc.
1780 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1781 // We only want to emit block info records for blocks that have multiple
1782 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK.
1783 // Other blocks can define their abbrevs inline.
1784 Stream.EnterBlockInfoBlock(2);
1786 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1787 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1788 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1789 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1790 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1791 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1792 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1793 Abbv) != VST_ENTRY_8_ABBREV)
1794 llvm_unreachable("Unexpected abbrev ordering!");
1797 { // 7-bit fixed width VST_ENTRY strings.
1798 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1799 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1800 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1801 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1802 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1803 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1804 Abbv) != VST_ENTRY_7_ABBREV)
1805 llvm_unreachable("Unexpected abbrev ordering!");
1807 { // 6-bit char6 VST_ENTRY strings.
1808 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1809 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1810 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1811 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1812 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1813 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1814 Abbv) != VST_ENTRY_6_ABBREV)
1815 llvm_unreachable("Unexpected abbrev ordering!");
1817 { // 6-bit char6 VST_BBENTRY strings.
1818 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1819 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1820 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1821 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1822 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1823 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1824 Abbv) != VST_BBENTRY_6_ABBREV)
1825 llvm_unreachable("Unexpected abbrev ordering!");
1830 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1831 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1832 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1833 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1834 Log2_32_Ceil(VE.getTypes().size()+1)));
1835 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1836 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1837 llvm_unreachable("Unexpected abbrev ordering!");
1840 { // INTEGER abbrev for CONSTANTS_BLOCK.
1841 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1842 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1843 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1844 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1845 Abbv) != CONSTANTS_INTEGER_ABBREV)
1846 llvm_unreachable("Unexpected abbrev ordering!");
1849 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1850 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1851 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1852 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1853 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1854 Log2_32_Ceil(VE.getTypes().size()+1)));
1855 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1857 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1858 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1859 llvm_unreachable("Unexpected abbrev ordering!");
1861 { // NULL abbrev for CONSTANTS_BLOCK.
1862 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1863 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1864 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1865 Abbv) != CONSTANTS_NULL_Abbrev)
1866 llvm_unreachable("Unexpected abbrev ordering!");
1869 // FIXME: This should only use space for first class types!
1871 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1872 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1873 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1874 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1875 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1876 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1877 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1878 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1879 llvm_unreachable("Unexpected abbrev ordering!");
1881 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1882 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1883 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1884 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1885 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1886 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1887 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1888 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1889 llvm_unreachable("Unexpected abbrev ordering!");
1891 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1892 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1893 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1894 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1895 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1896 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1897 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1898 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1899 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1900 llvm_unreachable("Unexpected abbrev ordering!");
1902 { // INST_CAST abbrev for FUNCTION_BLOCK.
1903 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1904 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1905 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1906 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1907 Log2_32_Ceil(VE.getTypes().size()+1)));
1908 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1909 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1910 Abbv) != FUNCTION_INST_CAST_ABBREV)
1911 llvm_unreachable("Unexpected abbrev ordering!");
1914 { // INST_RET abbrev for FUNCTION_BLOCK.
1915 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1916 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1917 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1918 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1919 llvm_unreachable("Unexpected abbrev ordering!");
1921 { // INST_RET abbrev for FUNCTION_BLOCK.
1922 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1923 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1924 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1925 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1926 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1927 llvm_unreachable("Unexpected abbrev ordering!");
1929 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1930 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1931 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1932 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1933 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1934 llvm_unreachable("Unexpected abbrev ordering!");
1940 /// WriteModule - Emit the specified module to the bitstream.
1941 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1942 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1944 SmallVector<unsigned, 1> Vals;
1945 unsigned CurVersion = 1;
1946 Vals.push_back(CurVersion);
1947 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1949 // Analyze the module, enumerating globals, functions, etc.
1950 ValueEnumerator VE(*M);
1952 // Emit blockinfo, which defines the standard abbreviations etc.
1953 WriteBlockInfo(VE, Stream);
1955 // Emit information about attribute groups.
1956 WriteAttributeGroupTable(VE, Stream);
1958 // Emit information about parameter attributes.
1959 WriteAttributeTable(VE, Stream);
1961 // Emit information describing all of the types in the module.
1962 WriteTypeTable(VE, Stream);
1964 writeComdats(VE, Stream);
1966 // Emit top-level description of module, including target triple, inline asm,
1967 // descriptors for global variables, and function prototype info.
1968 WriteModuleInfo(M, VE, Stream);
1971 WriteModuleConstants(VE, Stream);
1974 WriteModuleMetadata(M, VE, Stream);
1977 WriteModuleMetadataStore(M, Stream);
1979 // Emit names for globals/functions etc.
1980 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1982 // Emit module-level use-lists.
1983 if (shouldPreserveBitcodeUseListOrder())
1984 WriteUseListBlock(nullptr, VE, Stream);
1986 // Emit function bodies.
1987 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F)
1988 if (!F->isDeclaration())
1989 WriteFunction(*F, VE, Stream);
1994 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1995 /// header and trailer to make it compatible with the system archiver. To do
1996 /// this we emit the following header, and then emit a trailer that pads the
1997 /// file out to be a multiple of 16 bytes.
1999 /// struct bc_header {
2000 /// uint32_t Magic; // 0x0B17C0DE
2001 /// uint32_t Version; // Version, currently always 0.
2002 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
2003 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
2004 /// uint32_t CPUType; // CPU specifier.
2005 /// ... potentially more later ...
2008 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
2009 DarwinBCHeaderSize = 5*4
2012 static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
2013 uint32_t &Position) {
2014 Buffer[Position + 0] = (unsigned char) (Value >> 0);
2015 Buffer[Position + 1] = (unsigned char) (Value >> 8);
2016 Buffer[Position + 2] = (unsigned char) (Value >> 16);
2017 Buffer[Position + 3] = (unsigned char) (Value >> 24);
2021 static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
2023 unsigned CPUType = ~0U;
2025 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
2026 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
2027 // number from /usr/include/mach/machine.h. It is ok to reproduce the
2028 // specific constants here because they are implicitly part of the Darwin ABI.
2030 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
2031 DARWIN_CPU_TYPE_X86 = 7,
2032 DARWIN_CPU_TYPE_ARM = 12,
2033 DARWIN_CPU_TYPE_POWERPC = 18
2036 Triple::ArchType Arch = TT.getArch();
2037 if (Arch == Triple::x86_64)
2038 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
2039 else if (Arch == Triple::x86)
2040 CPUType = DARWIN_CPU_TYPE_X86;
2041 else if (Arch == Triple::ppc)
2042 CPUType = DARWIN_CPU_TYPE_POWERPC;
2043 else if (Arch == Triple::ppc64)
2044 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
2045 else if (Arch == Triple::arm || Arch == Triple::thumb)
2046 CPUType = DARWIN_CPU_TYPE_ARM;
2048 // Traditional Bitcode starts after header.
2049 assert(Buffer.size() >= DarwinBCHeaderSize &&
2050 "Expected header size to be reserved");
2051 unsigned BCOffset = DarwinBCHeaderSize;
2052 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize;
2054 // Write the magic and version.
2055 unsigned Position = 0;
2056 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position);
2057 WriteInt32ToBuffer(0 , Buffer, Position); // Version.
2058 WriteInt32ToBuffer(BCOffset , Buffer, Position);
2059 WriteInt32ToBuffer(BCSize , Buffer, Position);
2060 WriteInt32ToBuffer(CPUType , Buffer, Position);
2062 // If the file is not a multiple of 16 bytes, insert dummy padding.
2063 while (Buffer.size() & 15)
2064 Buffer.push_back(0);
2067 /// WriteBitcodeToFile - Write the specified module to the specified output
2069 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
2070 SmallVector<char, 0> Buffer;
2071 Buffer.reserve(256*1024);
2073 // If this is darwin or another generic macho target, reserve space for the
2075 Triple TT(M->getTargetTriple());
2076 if (TT.isOSDarwin())
2077 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0);
2079 // Emit the module into the buffer.
2081 BitstreamWriter Stream(Buffer);
2083 // Emit the file header.
2084 Stream.Emit((unsigned)'B', 8);
2085 Stream.Emit((unsigned)'C', 8);
2086 Stream.Emit(0x0, 4);
2087 Stream.Emit(0xC, 4);
2088 Stream.Emit(0xE, 4);
2089 Stream.Emit(0xD, 4);
2092 WriteModule(M, Stream);
2095 if (TT.isOSDarwin())
2096 EmitDarwinBCHeaderAndTrailer(Buffer, TT);
2098 // Write the generated bitstream to "Out".
2099 Out.write((char*)&Buffer.front(), Buffer.size());