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 "llvm/Bitcode/BitstreamWriter.h"
16 #include "llvm/Bitcode/LLVMBitCodes.h"
17 #include "ValueEnumerator.h"
18 #include "llvm/Constants.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/InlineAsm.h"
21 #include "llvm/Instructions.h"
22 #include "llvm/Metadata.h"
23 #include "llvm/Module.h"
24 #include "llvm/Operator.h"
25 #include "llvm/TypeSymbolTable.h"
26 #include "llvm/ValueSymbolTable.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/MathExtras.h"
29 #include "llvm/Support/raw_ostream.h"
30 #include "llvm/System/Program.h"
33 /// These are manifest constants used by the bitcode writer. They do not need to
34 /// be kept in sync with the reader, but need to be consistent within this file.
38 // VALUE_SYMTAB_BLOCK abbrev id's.
39 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
44 // CONSTANTS_BLOCK abbrev id's.
45 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
46 CONSTANTS_INTEGER_ABBREV,
47 CONSTANTS_CE_CAST_Abbrev,
48 CONSTANTS_NULL_Abbrev,
50 // FUNCTION_BLOCK abbrev id's.
51 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
52 FUNCTION_INST_BINOP_ABBREV,
53 FUNCTION_INST_BINOP_FLAGS_ABBREV,
54 FUNCTION_INST_CAST_ABBREV,
55 FUNCTION_INST_RET_VOID_ABBREV,
56 FUNCTION_INST_RET_VAL_ABBREV,
57 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;
79 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) {
81 default: llvm_unreachable("Unknown binary instruction!");
82 case Instruction::Add:
83 case Instruction::FAdd: return bitc::BINOP_ADD;
84 case Instruction::Sub:
85 case Instruction::FSub: return bitc::BINOP_SUB;
86 case Instruction::Mul:
87 case Instruction::FMul: return bitc::BINOP_MUL;
88 case Instruction::UDiv: return bitc::BINOP_UDIV;
89 case Instruction::FDiv:
90 case Instruction::SDiv: return bitc::BINOP_SDIV;
91 case Instruction::URem: return bitc::BINOP_UREM;
92 case Instruction::FRem:
93 case Instruction::SRem: return bitc::BINOP_SREM;
94 case Instruction::Shl: return bitc::BINOP_SHL;
95 case Instruction::LShr: return bitc::BINOP_LSHR;
96 case Instruction::AShr: return bitc::BINOP_ASHR;
97 case Instruction::And: return bitc::BINOP_AND;
98 case Instruction::Or: return bitc::BINOP_OR;
99 case Instruction::Xor: return bitc::BINOP_XOR;
105 static void WriteStringRecord(unsigned Code, const std::string &Str,
106 unsigned AbbrevToUse, BitstreamWriter &Stream) {
107 SmallVector<unsigned, 64> Vals;
109 // Code: [strchar x N]
110 for (unsigned i = 0, e = Str.size(); i != e; ++i)
111 Vals.push_back(Str[i]);
113 // Emit the finished record.
114 Stream.EmitRecord(Code, Vals, AbbrevToUse);
117 // Emit information about parameter attributes.
118 static void WriteAttributeTable(const ValueEnumerator &VE,
119 BitstreamWriter &Stream) {
120 const std::vector<AttrListPtr> &Attrs = VE.getAttributes();
121 if (Attrs.empty()) return;
123 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
125 SmallVector<uint64_t, 64> Record;
126 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
127 const AttrListPtr &A = Attrs[i];
128 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) {
129 const AttributeWithIndex &PAWI = A.getSlot(i);
130 Record.push_back(PAWI.Index);
132 // FIXME: remove in LLVM 3.0
133 // Store the alignment in the bitcode as a 16-bit raw value instead of a
134 // 5-bit log2 encoded value. Shift the bits above the alignment up by
136 uint64_t FauxAttr = PAWI.Attrs & 0xffff;
137 if (PAWI.Attrs & Attribute::Alignment)
138 FauxAttr |= (1ull<<16)<<(((PAWI.Attrs & Attribute::Alignment)-1) >> 16);
139 FauxAttr |= (PAWI.Attrs & (0x3FFull << 21)) << 11;
141 Record.push_back(FauxAttr);
144 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
151 /// WriteTypeTable - Write out the type table for a module.
152 static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
153 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
155 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */);
156 SmallVector<uint64_t, 64> TypeVals;
158 // Abbrev for TYPE_CODE_POINTER.
159 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
160 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
161 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
162 Log2_32_Ceil(VE.getTypes().size()+1)));
163 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
164 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
166 // Abbrev for TYPE_CODE_FUNCTION.
167 Abbv = new BitCodeAbbrev();
168 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
169 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
170 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0
171 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
172 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
173 Log2_32_Ceil(VE.getTypes().size()+1)));
174 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
176 // Abbrev for TYPE_CODE_STRUCT.
177 Abbv = new BitCodeAbbrev();
178 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT));
179 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
181 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
182 Log2_32_Ceil(VE.getTypes().size()+1)));
183 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv);
185 // Abbrev for TYPE_CODE_ARRAY.
186 Abbv = new BitCodeAbbrev();
187 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
188 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
189 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
190 Log2_32_Ceil(VE.getTypes().size()+1)));
191 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
193 // Emit an entry count so the reader can reserve space.
194 TypeVals.push_back(TypeList.size());
195 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
198 // Loop over all of the types, emitting each in turn.
199 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
200 const Type *T = TypeList[i].first;
204 switch (T->getTypeID()) {
205 default: llvm_unreachable("Unknown type!");
206 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
207 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
208 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
209 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
210 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
211 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
212 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
213 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break;
214 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
215 case Type::IntegerTyID:
217 Code = bitc::TYPE_CODE_INTEGER;
218 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
220 case Type::PointerTyID: {
221 const PointerType *PTy = cast<PointerType>(T);
222 // POINTER: [pointee type, address space]
223 Code = bitc::TYPE_CODE_POINTER;
224 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
225 unsigned AddressSpace = PTy->getAddressSpace();
226 TypeVals.push_back(AddressSpace);
227 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
230 case Type::FunctionTyID: {
231 const FunctionType *FT = cast<FunctionType>(T);
232 // FUNCTION: [isvararg, attrid, retty, paramty x N]
233 Code = bitc::TYPE_CODE_FUNCTION;
234 TypeVals.push_back(FT->isVarArg());
235 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0
236 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
237 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
238 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
239 AbbrevToUse = FunctionAbbrev;
242 case Type::StructTyID: {
243 const StructType *ST = cast<StructType>(T);
244 // STRUCT: [ispacked, eltty x N]
245 Code = bitc::TYPE_CODE_STRUCT;
246 TypeVals.push_back(ST->isPacked());
247 // Output all of the element types.
248 for (StructType::element_iterator I = ST->element_begin(),
249 E = ST->element_end(); I != E; ++I)
250 TypeVals.push_back(VE.getTypeID(*I));
251 AbbrevToUse = StructAbbrev;
254 case Type::ArrayTyID: {
255 const ArrayType *AT = cast<ArrayType>(T);
256 // ARRAY: [numelts, eltty]
257 Code = bitc::TYPE_CODE_ARRAY;
258 TypeVals.push_back(AT->getNumElements());
259 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
260 AbbrevToUse = ArrayAbbrev;
263 case Type::VectorTyID: {
264 const VectorType *VT = cast<VectorType>(T);
265 // VECTOR [numelts, eltty]
266 Code = bitc::TYPE_CODE_VECTOR;
267 TypeVals.push_back(VT->getNumElements());
268 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
273 // Emit the finished record.
274 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
281 static unsigned getEncodedLinkage(const GlobalValue *GV) {
282 switch (GV->getLinkage()) {
283 default: llvm_unreachable("Invalid linkage!");
284 case GlobalValue::GhostLinkage: // Map ghost linkage onto external.
285 case GlobalValue::ExternalLinkage: return 0;
286 case GlobalValue::WeakAnyLinkage: return 1;
287 case GlobalValue::AppendingLinkage: return 2;
288 case GlobalValue::InternalLinkage: return 3;
289 case GlobalValue::LinkOnceAnyLinkage: return 4;
290 case GlobalValue::DLLImportLinkage: return 5;
291 case GlobalValue::DLLExportLinkage: return 6;
292 case GlobalValue::ExternalWeakLinkage: return 7;
293 case GlobalValue::CommonLinkage: return 8;
294 case GlobalValue::PrivateLinkage: return 9;
295 case GlobalValue::WeakODRLinkage: return 10;
296 case GlobalValue::LinkOnceODRLinkage: return 11;
297 case GlobalValue::AvailableExternallyLinkage: return 12;
298 case GlobalValue::LinkerPrivateLinkage: return 13;
302 static unsigned getEncodedVisibility(const GlobalValue *GV) {
303 switch (GV->getVisibility()) {
304 default: llvm_unreachable("Invalid visibility!");
305 case GlobalValue::DefaultVisibility: return 0;
306 case GlobalValue::HiddenVisibility: return 1;
307 case GlobalValue::ProtectedVisibility: return 2;
311 // Emit top-level description of module, including target triple, inline asm,
312 // descriptors for global variables, and function prototype info.
313 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
314 BitstreamWriter &Stream) {
315 // Emit the list of dependent libraries for the Module.
316 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
317 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
319 // Emit various pieces of data attached to a module.
320 if (!M->getTargetTriple().empty())
321 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
323 if (!M->getDataLayout().empty())
324 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
326 if (!M->getModuleInlineAsm().empty())
327 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
330 // Emit information about sections and GC, computing how many there are. Also
331 // compute the maximum alignment value.
332 std::map<std::string, unsigned> SectionMap;
333 std::map<std::string, unsigned> GCMap;
334 unsigned MaxAlignment = 0;
335 unsigned MaxGlobalType = 0;
336 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
338 MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
339 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
341 if (!GV->hasSection()) continue;
342 // Give section names unique ID's.
343 unsigned &Entry = SectionMap[GV->getSection()];
344 if (Entry != 0) continue;
345 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
347 Entry = SectionMap.size();
349 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
350 MaxAlignment = std::max(MaxAlignment, F->getAlignment());
351 if (F->hasSection()) {
352 // Give section names unique ID's.
353 unsigned &Entry = SectionMap[F->getSection()];
355 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
357 Entry = SectionMap.size();
361 // Same for GC names.
362 unsigned &Entry = GCMap[F->getGC()];
364 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(),
366 Entry = GCMap.size();
371 // Emit abbrev for globals, now that we know # sections and max alignment.
372 unsigned SimpleGVarAbbrev = 0;
373 if (!M->global_empty()) {
374 // Add an abbrev for common globals with no visibility or thread localness.
375 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
376 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
377 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
378 Log2_32_Ceil(MaxGlobalType+1)));
379 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
380 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
381 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage.
382 if (MaxAlignment == 0) // Alignment.
383 Abbv->Add(BitCodeAbbrevOp(0));
385 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
386 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
387 Log2_32_Ceil(MaxEncAlignment+1)));
389 if (SectionMap.empty()) // Section.
390 Abbv->Add(BitCodeAbbrevOp(0));
392 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
393 Log2_32_Ceil(SectionMap.size()+1)));
394 // Don't bother emitting vis + thread local.
395 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
398 // Emit the global variable information.
399 SmallVector<unsigned, 64> Vals;
400 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
402 unsigned AbbrevToUse = 0;
404 // GLOBALVAR: [type, isconst, initid,
405 // linkage, alignment, section, visibility, threadlocal]
406 Vals.push_back(VE.getTypeID(GV->getType()));
407 Vals.push_back(GV->isConstant());
408 Vals.push_back(GV->isDeclaration() ? 0 :
409 (VE.getValueID(GV->getInitializer()) + 1));
410 Vals.push_back(getEncodedLinkage(GV));
411 Vals.push_back(Log2_32(GV->getAlignment())+1);
412 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
413 if (GV->isThreadLocal() ||
414 GV->getVisibility() != GlobalValue::DefaultVisibility) {
415 Vals.push_back(getEncodedVisibility(GV));
416 Vals.push_back(GV->isThreadLocal());
418 AbbrevToUse = SimpleGVarAbbrev;
421 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
425 // Emit the function proto information.
426 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
427 // FUNCTION: [type, callingconv, isproto, paramattr,
428 // linkage, alignment, section, visibility, gc]
429 Vals.push_back(VE.getTypeID(F->getType()));
430 Vals.push_back(F->getCallingConv());
431 Vals.push_back(F->isDeclaration());
432 Vals.push_back(getEncodedLinkage(F));
433 Vals.push_back(VE.getAttributeID(F->getAttributes()));
434 Vals.push_back(Log2_32(F->getAlignment())+1);
435 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
436 Vals.push_back(getEncodedVisibility(F));
437 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0);
439 unsigned AbbrevToUse = 0;
440 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
445 // Emit the alias information.
446 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
448 Vals.push_back(VE.getTypeID(AI->getType()));
449 Vals.push_back(VE.getValueID(AI->getAliasee()));
450 Vals.push_back(getEncodedLinkage(AI));
451 Vals.push_back(getEncodedVisibility(AI));
452 unsigned AbbrevToUse = 0;
453 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
458 static uint64_t GetOptimizationFlags(const Value *V) {
461 if (const OverflowingBinaryOperator *OBO =
462 dyn_cast<OverflowingBinaryOperator>(V)) {
463 if (OBO->hasNoSignedWrap())
464 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
465 if (OBO->hasNoUnsignedWrap())
466 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
467 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) {
469 Flags |= 1 << bitc::SDIV_EXACT;
475 static void WriteMDNode(const MDNode *N,
476 const ValueEnumerator &VE,
477 BitstreamWriter &Stream,
478 SmallVector<uint64_t, 64> &Record) {
479 for (unsigned i = 0, e = N->getNumElements(); i != e; ++i) {
480 if (N->getElement(i)) {
481 Record.push_back(VE.getTypeID(N->getElement(i)->getType()));
482 Record.push_back(VE.getValueID(N->getElement(i)));
484 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
488 Stream.EmitRecord(bitc::METADATA_NODE, Record, 0);
492 static void WriteModuleMetadata(const ValueEnumerator &VE,
493 BitstreamWriter &Stream) {
494 const ValueEnumerator::ValueList &Vals = VE.getMDValues();
495 bool StartedMetadataBlock = false;
496 unsigned MDSAbbrev = 0;
497 SmallVector<uint64_t, 64> Record;
498 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
500 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
501 if (!StartedMetadataBlock) {
502 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
503 StartedMetadataBlock = true;
505 WriteMDNode(N, VE, Stream, Record);
506 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
507 if (!StartedMetadataBlock) {
508 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
510 // Abbrev for METADATA_STRING.
511 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
512 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
513 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
514 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
515 MDSAbbrev = Stream.EmitAbbrev(Abbv);
516 StartedMetadataBlock = true;
519 // Code: [strchar x N]
520 Record.append(MDS->begin(), MDS->end());
522 // Emit the finished record.
523 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
525 } else if (const NamedMDNode *NMD = dyn_cast<NamedMDNode>(Vals[i].first)) {
526 if (!StartedMetadataBlock) {
527 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
528 StartedMetadataBlock = true;
532 std::string Str = NMD->getNameStr();
533 const char *StrBegin = Str.c_str();
534 for (unsigned i = 0, e = Str.length(); i != e; ++i)
535 Record.push_back(StrBegin[i]);
536 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
539 // Write named metadata elements.
540 for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i) {
541 if (NMD->getElement(i))
542 Record.push_back(VE.getValueID(NMD->getElement(i)));
546 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
551 if (StartedMetadataBlock)
555 static void WriteMetadataAttachment(const Function &F,
556 const ValueEnumerator &VE,
557 BitstreamWriter &Stream) {
558 bool StartedMetadataBlock = false;
559 SmallVector<uint64_t, 64> Record;
561 // Write metadata attachments
562 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
563 MetadataContext &TheMetadata = F.getContext().getMetadata();
564 typedef SmallVector<std::pair<unsigned, TrackingVH<MDNode> >, 2> MDMapTy;
566 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
567 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
570 TheMetadata.getMDs(I, MDs);
571 bool RecordedInstruction = false;
572 for (MDMapTy::const_iterator PI = MDs.begin(), PE = MDs.end();
574 if (RecordedInstruction == false) {
575 Record.push_back(VE.getInstructionID(I));
576 RecordedInstruction = true;
578 Record.push_back(PI->first);
579 Record.push_back(VE.getValueID(PI->second));
581 if (!Record.empty()) {
582 if (!StartedMetadataBlock) {
583 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
584 StartedMetadataBlock = true;
586 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
591 if (StartedMetadataBlock)
595 static void WriteModuleMetadataStore(const Module *M,
596 const ValueEnumerator &VE,
597 BitstreamWriter &Stream) {
599 bool StartedMetadataBlock = false;
600 SmallVector<uint64_t, 64> Record;
602 // Write metadata kinds
603 // METADATA_KIND - [n x [id, name]]
604 MetadataContext &TheMetadata = M->getContext().getMetadata();
605 SmallVector<std::pair<unsigned, StringRef>, 4> Names;
606 TheMetadata.getHandlerNames(Names);
607 for (SmallVector<std::pair<unsigned, StringRef>, 4>::iterator
609 E = Names.end(); I != E; ++I) {
610 Record.push_back(I->first);
611 StringRef KName = I->second;
612 for (unsigned i = 0, e = KName.size(); i != e; ++i)
613 Record.push_back(KName[i]);
614 if (!StartedMetadataBlock) {
615 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
616 StartedMetadataBlock = true;
618 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
622 if (StartedMetadataBlock)
626 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
627 const ValueEnumerator &VE,
628 BitstreamWriter &Stream, bool isGlobal) {
629 if (FirstVal == LastVal) return;
631 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
633 unsigned AggregateAbbrev = 0;
634 unsigned String8Abbrev = 0;
635 unsigned CString7Abbrev = 0;
636 unsigned CString6Abbrev = 0;
637 // If this is a constant pool for the module, emit module-specific abbrevs.
639 // Abbrev for CST_CODE_AGGREGATE.
640 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
641 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
642 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
643 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
644 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
646 // Abbrev for CST_CODE_STRING.
647 Abbv = new BitCodeAbbrev();
648 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
649 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
650 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
651 String8Abbrev = Stream.EmitAbbrev(Abbv);
652 // Abbrev for CST_CODE_CSTRING.
653 Abbv = new BitCodeAbbrev();
654 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
655 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
656 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
657 CString7Abbrev = Stream.EmitAbbrev(Abbv);
658 // Abbrev for CST_CODE_CSTRING.
659 Abbv = new BitCodeAbbrev();
660 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
661 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
662 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
663 CString6Abbrev = Stream.EmitAbbrev(Abbv);
666 SmallVector<uint64_t, 64> Record;
668 const ValueEnumerator::ValueList &Vals = VE.getValues();
669 const Type *LastTy = 0;
670 for (unsigned i = FirstVal; i != LastVal; ++i) {
671 const Value *V = Vals[i].first;
672 // If we need to switch types, do so now.
673 if (V->getType() != LastTy) {
674 LastTy = V->getType();
675 Record.push_back(VE.getTypeID(LastTy));
676 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
677 CONSTANTS_SETTYPE_ABBREV);
681 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
682 Record.push_back(unsigned(IA->hasSideEffects()) |
683 unsigned(IA->isAlignStack()) << 1);
685 // Add the asm string.
686 const std::string &AsmStr = IA->getAsmString();
687 Record.push_back(AsmStr.size());
688 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
689 Record.push_back(AsmStr[i]);
691 // Add the constraint string.
692 const std::string &ConstraintStr = IA->getConstraintString();
693 Record.push_back(ConstraintStr.size());
694 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
695 Record.push_back(ConstraintStr[i]);
696 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
700 const Constant *C = cast<Constant>(V);
702 unsigned AbbrevToUse = 0;
703 if (C->isNullValue()) {
704 Code = bitc::CST_CODE_NULL;
705 } else if (isa<UndefValue>(C)) {
706 Code = bitc::CST_CODE_UNDEF;
707 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
708 if (IV->getBitWidth() <= 64) {
709 int64_t V = IV->getSExtValue();
711 Record.push_back(V << 1);
713 Record.push_back((-V << 1) | 1);
714 Code = bitc::CST_CODE_INTEGER;
715 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
716 } else { // Wide integers, > 64 bits in size.
717 // We have an arbitrary precision integer value to write whose
718 // bit width is > 64. However, in canonical unsigned integer
719 // format it is likely that the high bits are going to be zero.
720 // So, we only write the number of active words.
721 unsigned NWords = IV->getValue().getActiveWords();
722 const uint64_t *RawWords = IV->getValue().getRawData();
723 for (unsigned i = 0; i != NWords; ++i) {
724 int64_t V = RawWords[i];
726 Record.push_back(V << 1);
728 Record.push_back((-V << 1) | 1);
730 Code = bitc::CST_CODE_WIDE_INTEGER;
732 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
733 Code = bitc::CST_CODE_FLOAT;
734 const Type *Ty = CFP->getType();
735 if (Ty->isFloatTy() || Ty->isDoubleTy()) {
736 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
737 } else if (Ty->isX86_FP80Ty()) {
738 // api needed to prevent premature destruction
739 // bits are not in the same order as a normal i80 APInt, compensate.
740 APInt api = CFP->getValueAPF().bitcastToAPInt();
741 const uint64_t *p = api.getRawData();
742 Record.push_back((p[1] << 48) | (p[0] >> 16));
743 Record.push_back(p[0] & 0xffffLL);
744 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
745 APInt api = CFP->getValueAPF().bitcastToAPInt();
746 const uint64_t *p = api.getRawData();
747 Record.push_back(p[0]);
748 Record.push_back(p[1]);
750 assert (0 && "Unknown FP type!");
752 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
753 // Emit constant strings specially.
754 unsigned NumOps = C->getNumOperands();
755 // If this is a null-terminated string, use the denser CSTRING encoding.
756 if (C->getOperand(NumOps-1)->isNullValue()) {
757 Code = bitc::CST_CODE_CSTRING;
758 --NumOps; // Don't encode the null, which isn't allowed by char6.
760 Code = bitc::CST_CODE_STRING;
761 AbbrevToUse = String8Abbrev;
763 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
764 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
765 for (unsigned i = 0; i != NumOps; ++i) {
766 unsigned char V = cast<ConstantInt>(C->getOperand(i))->getZExtValue();
768 isCStr7 &= (V & 128) == 0;
770 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
774 AbbrevToUse = CString6Abbrev;
776 AbbrevToUse = CString7Abbrev;
777 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
778 isa<ConstantVector>(V)) {
779 Code = bitc::CST_CODE_AGGREGATE;
780 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
781 Record.push_back(VE.getValueID(C->getOperand(i)));
782 AbbrevToUse = AggregateAbbrev;
783 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
784 switch (CE->getOpcode()) {
786 if (Instruction::isCast(CE->getOpcode())) {
787 Code = bitc::CST_CODE_CE_CAST;
788 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
789 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
790 Record.push_back(VE.getValueID(C->getOperand(0)));
791 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
793 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
794 Code = bitc::CST_CODE_CE_BINOP;
795 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
796 Record.push_back(VE.getValueID(C->getOperand(0)));
797 Record.push_back(VE.getValueID(C->getOperand(1)));
798 uint64_t Flags = GetOptimizationFlags(CE);
800 Record.push_back(Flags);
803 case Instruction::GetElementPtr:
804 Code = bitc::CST_CODE_CE_GEP;
805 if (cast<GEPOperator>(C)->isInBounds())
806 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
807 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
808 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
809 Record.push_back(VE.getValueID(C->getOperand(i)));
812 case Instruction::Select:
813 Code = bitc::CST_CODE_CE_SELECT;
814 Record.push_back(VE.getValueID(C->getOperand(0)));
815 Record.push_back(VE.getValueID(C->getOperand(1)));
816 Record.push_back(VE.getValueID(C->getOperand(2)));
818 case Instruction::ExtractElement:
819 Code = bitc::CST_CODE_CE_EXTRACTELT;
820 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
821 Record.push_back(VE.getValueID(C->getOperand(0)));
822 Record.push_back(VE.getValueID(C->getOperand(1)));
824 case Instruction::InsertElement:
825 Code = bitc::CST_CODE_CE_INSERTELT;
826 Record.push_back(VE.getValueID(C->getOperand(0)));
827 Record.push_back(VE.getValueID(C->getOperand(1)));
828 Record.push_back(VE.getValueID(C->getOperand(2)));
830 case Instruction::ShuffleVector:
831 // If the return type and argument types are the same, this is a
832 // standard shufflevector instruction. If the types are different,
833 // then the shuffle is widening or truncating the input vectors, and
834 // the argument type must also be encoded.
835 if (C->getType() == C->getOperand(0)->getType()) {
836 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
838 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
839 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
841 Record.push_back(VE.getValueID(C->getOperand(0)));
842 Record.push_back(VE.getValueID(C->getOperand(1)));
843 Record.push_back(VE.getValueID(C->getOperand(2)));
845 case Instruction::ICmp:
846 case Instruction::FCmp:
847 Code = bitc::CST_CODE_CE_CMP;
848 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
849 Record.push_back(VE.getValueID(C->getOperand(0)));
850 Record.push_back(VE.getValueID(C->getOperand(1)));
851 Record.push_back(CE->getPredicate());
855 llvm_unreachable("Unknown constant!");
857 Stream.EmitRecord(Code, Record, AbbrevToUse);
864 static void WriteModuleConstants(const ValueEnumerator &VE,
865 BitstreamWriter &Stream) {
866 const ValueEnumerator::ValueList &Vals = VE.getValues();
868 // Find the first constant to emit, which is the first non-globalvalue value.
869 // We know globalvalues have been emitted by WriteModuleInfo.
870 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
871 if (!isa<GlobalValue>(Vals[i].first)) {
872 WriteConstants(i, Vals.size(), VE, Stream, true);
878 /// PushValueAndType - The file has to encode both the value and type id for
879 /// many values, because we need to know what type to create for forward
880 /// references. However, most operands are not forward references, so this type
881 /// field is not needed.
883 /// This function adds V's value ID to Vals. If the value ID is higher than the
884 /// instruction ID, then it is a forward reference, and it also includes the
886 static bool PushValueAndType(const Value *V, unsigned InstID,
887 SmallVector<unsigned, 64> &Vals,
888 ValueEnumerator &VE) {
889 unsigned ValID = VE.getValueID(V);
890 Vals.push_back(ValID);
891 if (ValID >= InstID) {
892 Vals.push_back(VE.getTypeID(V->getType()));
898 /// WriteInstruction - Emit an instruction to the specified stream.
899 static void WriteInstruction(const Instruction &I, unsigned InstID,
900 ValueEnumerator &VE, BitstreamWriter &Stream,
901 SmallVector<unsigned, 64> &Vals) {
903 unsigned AbbrevToUse = 0;
904 VE.setInstructionID(&I);
905 switch (I.getOpcode()) {
907 if (Instruction::isCast(I.getOpcode())) {
908 Code = bitc::FUNC_CODE_INST_CAST;
909 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
910 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
911 Vals.push_back(VE.getTypeID(I.getType()));
912 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
914 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
915 Code = bitc::FUNC_CODE_INST_BINOP;
916 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
917 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
918 Vals.push_back(VE.getValueID(I.getOperand(1)));
919 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
920 uint64_t Flags = GetOptimizationFlags(&I);
922 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
923 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
924 Vals.push_back(Flags);
929 case Instruction::GetElementPtr:
930 Code = bitc::FUNC_CODE_INST_GEP;
931 if (cast<GEPOperator>(&I)->isInBounds())
932 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP;
933 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
934 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
936 case Instruction::ExtractValue: {
937 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
938 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
939 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
940 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
944 case Instruction::InsertValue: {
945 Code = bitc::FUNC_CODE_INST_INSERTVAL;
946 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
947 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
948 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
949 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
953 case Instruction::Select:
954 Code = bitc::FUNC_CODE_INST_VSELECT;
955 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
956 Vals.push_back(VE.getValueID(I.getOperand(2)));
957 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
959 case Instruction::ExtractElement:
960 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
961 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
962 Vals.push_back(VE.getValueID(I.getOperand(1)));
964 case Instruction::InsertElement:
965 Code = bitc::FUNC_CODE_INST_INSERTELT;
966 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
967 Vals.push_back(VE.getValueID(I.getOperand(1)));
968 Vals.push_back(VE.getValueID(I.getOperand(2)));
970 case Instruction::ShuffleVector:
971 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
972 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
973 Vals.push_back(VE.getValueID(I.getOperand(1)));
974 Vals.push_back(VE.getValueID(I.getOperand(2)));
976 case Instruction::ICmp:
977 case Instruction::FCmp:
978 // compare returning Int1Ty or vector of Int1Ty
979 Code = bitc::FUNC_CODE_INST_CMP2;
980 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
981 Vals.push_back(VE.getValueID(I.getOperand(1)));
982 Vals.push_back(cast<CmpInst>(I).getPredicate());
985 case Instruction::Ret:
987 Code = bitc::FUNC_CODE_INST_RET;
988 unsigned NumOperands = I.getNumOperands();
989 if (NumOperands == 0)
990 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
991 else if (NumOperands == 1) {
992 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
993 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
995 for (unsigned i = 0, e = NumOperands; i != e; ++i)
996 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1000 case Instruction::Br:
1002 Code = bitc::FUNC_CODE_INST_BR;
1003 BranchInst &II(cast<BranchInst>(I));
1004 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
1005 if (II.isConditional()) {
1006 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
1007 Vals.push_back(VE.getValueID(II.getCondition()));
1011 case Instruction::Switch:
1012 Code = bitc::FUNC_CODE_INST_SWITCH;
1013 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1014 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1015 Vals.push_back(VE.getValueID(I.getOperand(i)));
1017 case Instruction::Invoke: {
1018 const InvokeInst *II = cast<InvokeInst>(&I);
1019 const Value *Callee(II->getCalledValue());
1020 const PointerType *PTy = cast<PointerType>(Callee->getType());
1021 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1022 Code = bitc::FUNC_CODE_INST_INVOKE;
1024 Vals.push_back(VE.getAttributeID(II->getAttributes()));
1025 Vals.push_back(II->getCallingConv());
1026 Vals.push_back(VE.getValueID(II->getNormalDest()));
1027 Vals.push_back(VE.getValueID(II->getUnwindDest()));
1028 PushValueAndType(Callee, InstID, Vals, VE);
1030 // Emit value #'s for the fixed parameters.
1031 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1032 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param.
1034 // Emit type/value pairs for varargs params.
1035 if (FTy->isVarArg()) {
1036 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands();
1038 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
1042 case Instruction::Unwind:
1043 Code = bitc::FUNC_CODE_INST_UNWIND;
1045 case Instruction::Unreachable:
1046 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
1047 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
1050 case Instruction::PHI:
1051 Code = bitc::FUNC_CODE_INST_PHI;
1052 Vals.push_back(VE.getTypeID(I.getType()));
1053 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1054 Vals.push_back(VE.getValueID(I.getOperand(i)));
1057 case Instruction::Alloca:
1058 Code = bitc::FUNC_CODE_INST_ALLOCA;
1059 Vals.push_back(VE.getTypeID(I.getType()));
1060 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1061 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
1064 case Instruction::Load:
1065 Code = bitc::FUNC_CODE_INST_LOAD;
1066 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1067 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1069 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1070 Vals.push_back(cast<LoadInst>(I).isVolatile());
1072 case Instruction::Store:
1073 Code = bitc::FUNC_CODE_INST_STORE2;
1074 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1075 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
1076 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1077 Vals.push_back(cast<StoreInst>(I).isVolatile());
1079 case Instruction::Call: {
1080 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
1081 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1083 Code = bitc::FUNC_CODE_INST_CALL;
1085 const CallInst *CI = cast<CallInst>(&I);
1086 Vals.push_back(VE.getAttributeID(CI->getAttributes()));
1087 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall()));
1088 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee
1090 // Emit value #'s for the fixed parameters.
1091 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1092 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param.
1094 // Emit type/value pairs for varargs params.
1095 if (FTy->isVarArg()) {
1096 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams();
1097 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands();
1099 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs
1103 case Instruction::VAArg:
1104 Code = bitc::FUNC_CODE_INST_VAARG;
1105 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
1106 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
1107 Vals.push_back(VE.getTypeID(I.getType())); // restype.
1111 Stream.EmitRecord(Code, Vals, AbbrevToUse);
1115 // Emit names for globals/functions etc.
1116 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
1117 const ValueEnumerator &VE,
1118 BitstreamWriter &Stream) {
1119 if (VST.empty()) return;
1120 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
1122 // FIXME: Set up the abbrev, we know how many values there are!
1123 // FIXME: We know if the type names can use 7-bit ascii.
1124 SmallVector<unsigned, 64> NameVals;
1126 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
1129 const ValueName &Name = *SI;
1131 // Figure out the encoding to use for the name.
1133 bool isChar6 = true;
1134 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
1137 isChar6 = BitCodeAbbrevOp::isChar6(*C);
1138 if ((unsigned char)*C & 128) {
1140 break; // don't bother scanning the rest.
1144 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
1146 // VST_ENTRY: [valueid, namechar x N]
1147 // VST_BBENTRY: [bbid, namechar x N]
1149 if (isa<BasicBlock>(SI->getValue())) {
1150 Code = bitc::VST_CODE_BBENTRY;
1152 AbbrevToUse = VST_BBENTRY_6_ABBREV;
1154 Code = bitc::VST_CODE_ENTRY;
1156 AbbrevToUse = VST_ENTRY_6_ABBREV;
1158 AbbrevToUse = VST_ENTRY_7_ABBREV;
1161 NameVals.push_back(VE.getValueID(SI->getValue()));
1162 for (const char *P = Name.getKeyData(),
1163 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
1164 NameVals.push_back((unsigned char)*P);
1166 // Emit the finished record.
1167 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
1173 /// WriteFunction - Emit a function body to the module stream.
1174 static void WriteFunction(const Function &F, ValueEnumerator &VE,
1175 BitstreamWriter &Stream) {
1176 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
1177 VE.incorporateFunction(F);
1179 SmallVector<unsigned, 64> Vals;
1181 // Emit the number of basic blocks, so the reader can create them ahead of
1183 Vals.push_back(VE.getBasicBlocks().size());
1184 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
1187 // If there are function-local constants, emit them now.
1188 unsigned CstStart, CstEnd;
1189 VE.getFunctionConstantRange(CstStart, CstEnd);
1190 WriteConstants(CstStart, CstEnd, VE, Stream, false);
1192 // Keep a running idea of what the instruction ID is.
1193 unsigned InstID = CstEnd;
1195 // Finally, emit all the instructions, in order.
1196 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
1197 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
1199 WriteInstruction(*I, InstID, VE, Stream, Vals);
1200 if (I->getType() != Type::getVoidTy(F.getContext()))
1204 // Emit names for all the instructions etc.
1205 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1207 WriteMetadataAttachment(F, VE, Stream);
1212 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
1213 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
1214 const ValueEnumerator &VE,
1215 BitstreamWriter &Stream) {
1216 if (TST.empty()) return;
1218 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
1220 // 7-bit fixed width VST_CODE_ENTRY strings.
1221 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1222 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1223 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1224 Log2_32_Ceil(VE.getTypes().size()+1)));
1225 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1226 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1227 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
1229 SmallVector<unsigned, 64> NameVals;
1231 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1233 // TST_ENTRY: [typeid, namechar x N]
1234 NameVals.push_back(VE.getTypeID(TI->second));
1236 const std::string &Str = TI->first;
1238 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1239 NameVals.push_back((unsigned char)Str[i]);
1244 // Emit the finished record.
1245 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1252 // Emit blockinfo, which defines the standard abbreviations etc.
1253 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1254 // We only want to emit block info records for blocks that have multiple
1255 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1256 // blocks can defined their abbrevs inline.
1257 Stream.EnterBlockInfoBlock(2);
1259 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1260 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1261 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1262 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1263 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1264 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1265 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1266 Abbv) != VST_ENTRY_8_ABBREV)
1267 llvm_unreachable("Unexpected abbrev ordering!");
1270 { // 7-bit fixed width VST_ENTRY strings.
1271 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1272 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1273 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1274 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1275 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1276 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1277 Abbv) != VST_ENTRY_7_ABBREV)
1278 llvm_unreachable("Unexpected abbrev ordering!");
1280 { // 6-bit char6 VST_ENTRY strings.
1281 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1282 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1283 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1284 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1285 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1286 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1287 Abbv) != VST_ENTRY_6_ABBREV)
1288 llvm_unreachable("Unexpected abbrev ordering!");
1290 { // 6-bit char6 VST_BBENTRY strings.
1291 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1292 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1293 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1294 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1295 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1296 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1297 Abbv) != VST_BBENTRY_6_ABBREV)
1298 llvm_unreachable("Unexpected abbrev ordering!");
1303 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1304 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1305 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1306 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1307 Log2_32_Ceil(VE.getTypes().size()+1)));
1308 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1309 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1310 llvm_unreachable("Unexpected abbrev ordering!");
1313 { // INTEGER abbrev for CONSTANTS_BLOCK.
1314 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1315 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1316 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1317 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1318 Abbv) != CONSTANTS_INTEGER_ABBREV)
1319 llvm_unreachable("Unexpected abbrev ordering!");
1322 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1323 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1324 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1325 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1326 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1327 Log2_32_Ceil(VE.getTypes().size()+1)));
1328 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1330 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1331 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1332 llvm_unreachable("Unexpected abbrev ordering!");
1334 { // NULL abbrev for CONSTANTS_BLOCK.
1335 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1336 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1337 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1338 Abbv) != CONSTANTS_NULL_Abbrev)
1339 llvm_unreachable("Unexpected abbrev ordering!");
1342 // FIXME: This should only use space for first class types!
1344 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1345 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1346 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1347 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1348 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1349 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1350 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1351 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1352 llvm_unreachable("Unexpected abbrev ordering!");
1354 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1355 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1356 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1357 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1358 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1359 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1360 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1361 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1362 llvm_unreachable("Unexpected abbrev ordering!");
1364 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1365 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1366 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1367 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1368 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1369 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1370 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1371 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1372 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1373 llvm_unreachable("Unexpected abbrev ordering!");
1375 { // INST_CAST abbrev for FUNCTION_BLOCK.
1376 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1377 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1379 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1380 Log2_32_Ceil(VE.getTypes().size()+1)));
1381 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1382 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1383 Abbv) != FUNCTION_INST_CAST_ABBREV)
1384 llvm_unreachable("Unexpected abbrev ordering!");
1387 { // INST_RET abbrev for FUNCTION_BLOCK.
1388 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1389 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1390 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1391 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1392 llvm_unreachable("Unexpected abbrev ordering!");
1394 { // INST_RET abbrev for FUNCTION_BLOCK.
1395 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1396 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1397 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1398 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1399 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1400 llvm_unreachable("Unexpected abbrev ordering!");
1402 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1403 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1404 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1405 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1406 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1407 llvm_unreachable("Unexpected abbrev ordering!");
1414 /// WriteModule - Emit the specified module to the bitstream.
1415 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1416 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1418 // Emit the version number if it is non-zero.
1420 SmallVector<unsigned, 1> Vals;
1421 Vals.push_back(CurVersion);
1422 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1425 // Analyze the module, enumerating globals, functions, etc.
1426 ValueEnumerator VE(M);
1428 // Emit blockinfo, which defines the standard abbreviations etc.
1429 WriteBlockInfo(VE, Stream);
1431 // Emit information about parameter attributes.
1432 WriteAttributeTable(VE, Stream);
1434 // Emit information describing all of the types in the module.
1435 WriteTypeTable(VE, Stream);
1437 // Emit top-level description of module, including target triple, inline asm,
1438 // descriptors for global variables, and function prototype info.
1439 WriteModuleInfo(M, VE, Stream);
1442 WriteModuleConstants(VE, Stream);
1445 WriteModuleMetadata(VE, Stream);
1447 // Emit function bodies.
1448 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1449 if (!I->isDeclaration())
1450 WriteFunction(*I, VE, Stream);
1453 WriteModuleMetadataStore(M, VE, Stream);
1455 // Emit the type symbol table information.
1456 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1458 // Emit names for globals/functions etc.
1459 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1464 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1465 /// header and trailer to make it compatible with the system archiver. To do
1466 /// this we emit the following header, and then emit a trailer that pads the
1467 /// file out to be a multiple of 16 bytes.
1469 /// struct bc_header {
1470 /// uint32_t Magic; // 0x0B17C0DE
1471 /// uint32_t Version; // Version, currently always 0.
1472 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1473 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1474 /// uint32_t CPUType; // CPU specifier.
1475 /// ... potentially more later ...
1478 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
1479 DarwinBCHeaderSize = 5*4
1482 static void EmitDarwinBCHeader(BitstreamWriter &Stream,
1483 const std::string &TT) {
1484 unsigned CPUType = ~0U;
1486 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*. The CPUType is a
1487 // magic number from /usr/include/mach/machine.h. It is ok to reproduce the
1488 // specific constants here because they are implicitly part of the Darwin ABI.
1490 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
1491 DARWIN_CPU_TYPE_X86 = 7,
1492 DARWIN_CPU_TYPE_POWERPC = 18
1495 if (TT.find("x86_64-") == 0)
1496 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
1497 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
1498 TT[4] == '-' && TT[1] - '3' < 6)
1499 CPUType = DARWIN_CPU_TYPE_X86;
1500 else if (TT.find("powerpc-") == 0)
1501 CPUType = DARWIN_CPU_TYPE_POWERPC;
1502 else if (TT.find("powerpc64-") == 0)
1503 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
1505 // Traditional Bitcode starts after header.
1506 unsigned BCOffset = DarwinBCHeaderSize;
1508 Stream.Emit(0x0B17C0DE, 32);
1509 Stream.Emit(0 , 32); // Version.
1510 Stream.Emit(BCOffset , 32);
1511 Stream.Emit(0 , 32); // Filled in later.
1512 Stream.Emit(CPUType , 32);
1515 /// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and
1516 /// finalize the header.
1517 static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) {
1518 // Update the size field in the header.
1519 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize);
1521 // If the file is not a multiple of 16 bytes, insert dummy padding.
1522 while (BufferSize & 15) {
1529 /// WriteBitcodeToFile - Write the specified module to the specified output
1531 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
1532 std::vector<unsigned char> Buffer;
1533 BitstreamWriter Stream(Buffer);
1535 Buffer.reserve(256*1024);
1537 WriteBitcodeToStream( M, Stream );
1539 // If writing to stdout, set binary mode.
1540 if (&llvm::outs() == &Out)
1541 sys::Program::ChangeStdoutToBinary();
1543 // Write the generated bitstream to "Out".
1544 Out.write((char*)&Buffer.front(), Buffer.size());
1546 // Make sure it hits disk now.
1550 /// WriteBitcodeToStream - Write the specified module to the specified output
1552 void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) {
1553 // If this is darwin, emit a file header and trailer if needed.
1554 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos;
1556 EmitDarwinBCHeader(Stream, M->getTargetTriple());
1558 // Emit the file header.
1559 Stream.Emit((unsigned)'B', 8);
1560 Stream.Emit((unsigned)'C', 8);
1561 Stream.Emit(0x0, 4);
1562 Stream.Emit(0xC, 4);
1563 Stream.Emit(0xE, 4);
1564 Stream.Emit(0xD, 4);
1567 WriteModule(M, Stream);
1570 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());