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/Module.h"
23 #include "llvm/Operator.h"
24 #include "llvm/TypeSymbolTable.h"
25 #include "llvm/ValueSymbolTable.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/MathExtras.h"
28 #include "llvm/Support/raw_ostream.h"
29 #include "llvm/System/Program.h"
32 /// These are manifest constants used by the bitcode writer. They do not need to
33 /// be kept in sync with the reader, but need to be consistent within this file.
37 // VALUE_SYMTAB_BLOCK abbrev id's.
38 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
43 // CONSTANTS_BLOCK abbrev id's.
44 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
45 CONSTANTS_INTEGER_ABBREV,
46 CONSTANTS_CE_CAST_Abbrev,
47 CONSTANTS_NULL_Abbrev,
49 // FUNCTION_BLOCK abbrev id's.
50 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
51 FUNCTION_INST_BINOP_ABBREV,
52 FUNCTION_INST_BINOP_FLAGS_ABBREV,
53 FUNCTION_INST_CAST_ABBREV,
54 FUNCTION_INST_RET_VOID_ABBREV,
55 FUNCTION_INST_RET_VAL_ABBREV,
56 FUNCTION_INST_UNREACHABLE_ABBREV
60 static unsigned GetEncodedCastOpcode(unsigned Opcode) {
62 default: llvm_unreachable("Unknown cast instruction!");
63 case Instruction::Trunc : return bitc::CAST_TRUNC;
64 case Instruction::ZExt : return bitc::CAST_ZEXT;
65 case Instruction::SExt : return bitc::CAST_SEXT;
66 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
67 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
68 case Instruction::UIToFP : return bitc::CAST_UITOFP;
69 case Instruction::SIToFP : return bitc::CAST_SITOFP;
70 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
71 case Instruction::FPExt : return bitc::CAST_FPEXT;
72 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
73 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
74 case Instruction::BitCast : return bitc::CAST_BITCAST;
78 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) {
80 default: llvm_unreachable("Unknown binary instruction!");
81 case Instruction::Add:
82 case Instruction::FAdd: return bitc::BINOP_ADD;
83 case Instruction::Sub:
84 case Instruction::FSub: return bitc::BINOP_SUB;
85 case Instruction::Mul:
86 case Instruction::FMul: return bitc::BINOP_MUL;
87 case Instruction::UDiv: return bitc::BINOP_UDIV;
88 case Instruction::FDiv:
89 case Instruction::SDiv: return bitc::BINOP_SDIV;
90 case Instruction::URem: return bitc::BINOP_UREM;
91 case Instruction::FRem:
92 case Instruction::SRem: return bitc::BINOP_SREM;
93 case Instruction::Shl: return bitc::BINOP_SHL;
94 case Instruction::LShr: return bitc::BINOP_LSHR;
95 case Instruction::AShr: return bitc::BINOP_ASHR;
96 case Instruction::And: return bitc::BINOP_AND;
97 case Instruction::Or: return bitc::BINOP_OR;
98 case Instruction::Xor: return bitc::BINOP_XOR;
104 static void WriteStringRecord(unsigned Code, const std::string &Str,
105 unsigned AbbrevToUse, BitstreamWriter &Stream) {
106 SmallVector<unsigned, 64> Vals;
108 // Code: [strchar x N]
109 for (unsigned i = 0, e = Str.size(); i != e; ++i)
110 Vals.push_back(Str[i]);
112 // Emit the finished record.
113 Stream.EmitRecord(Code, Vals, AbbrevToUse);
116 // Emit information about parameter attributes.
117 static void WriteAttributeTable(const ValueEnumerator &VE,
118 BitstreamWriter &Stream) {
119 const std::vector<AttrListPtr> &Attrs = VE.getAttributes();
120 if (Attrs.empty()) return;
122 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
124 SmallVector<uint64_t, 64> Record;
125 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
126 const AttrListPtr &A = Attrs[i];
127 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) {
128 const AttributeWithIndex &PAWI = A.getSlot(i);
129 Record.push_back(PAWI.Index);
131 // FIXME: remove in LLVM 3.0
132 // Store the alignment in the bitcode as a 16-bit raw value instead of a
133 // 5-bit log2 encoded value. Shift the bits above the alignment up by
135 uint64_t FauxAttr = PAWI.Attrs & 0xffff;
136 if (PAWI.Attrs & Attribute::Alignment)
137 FauxAttr |= (1ull<<16)<<(((PAWI.Attrs & Attribute::Alignment)-1) >> 16);
138 FauxAttr |= (PAWI.Attrs & (0x3FFull << 21)) << 11;
140 Record.push_back(FauxAttr);
143 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
150 /// WriteTypeTable - Write out the type table for a module.
151 static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
152 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
154 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */);
155 SmallVector<uint64_t, 64> TypeVals;
157 // Abbrev for TYPE_CODE_POINTER.
158 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
159 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
160 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
161 Log2_32_Ceil(VE.getTypes().size()+1)));
162 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
163 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
165 // Abbrev for TYPE_CODE_FUNCTION.
166 Abbv = new BitCodeAbbrev();
167 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
168 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
169 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0
170 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
171 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
172 Log2_32_Ceil(VE.getTypes().size()+1)));
173 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
175 // Abbrev for TYPE_CODE_STRUCT.
176 Abbv = new BitCodeAbbrev();
177 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT));
178 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
179 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
180 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
181 Log2_32_Ceil(VE.getTypes().size()+1)));
182 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv);
184 // Abbrev for TYPE_CODE_ARRAY.
185 Abbv = new BitCodeAbbrev();
186 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
187 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
188 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
189 Log2_32_Ceil(VE.getTypes().size()+1)));
190 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
192 // Emit an entry count so the reader can reserve space.
193 TypeVals.push_back(TypeList.size());
194 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
197 // Loop over all of the types, emitting each in turn.
198 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
199 const Type *T = TypeList[i].first;
203 switch (T->getTypeID()) {
204 default: llvm_unreachable("Unknown type!");
205 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
206 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
207 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
208 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
209 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
210 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
211 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
212 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break;
213 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
214 case Type::IntegerTyID:
216 Code = bitc::TYPE_CODE_INTEGER;
217 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
219 case Type::PointerTyID: {
220 const PointerType *PTy = cast<PointerType>(T);
221 // POINTER: [pointee type, address space]
222 Code = bitc::TYPE_CODE_POINTER;
223 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
224 unsigned AddressSpace = PTy->getAddressSpace();
225 TypeVals.push_back(AddressSpace);
226 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
229 case Type::FunctionTyID: {
230 const FunctionType *FT = cast<FunctionType>(T);
231 // FUNCTION: [isvararg, attrid, retty, paramty x N]
232 Code = bitc::TYPE_CODE_FUNCTION;
233 TypeVals.push_back(FT->isVarArg());
234 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0
235 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
236 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
237 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
238 AbbrevToUse = FunctionAbbrev;
241 case Type::StructTyID: {
242 const StructType *ST = cast<StructType>(T);
243 // STRUCT: [ispacked, eltty x N]
244 Code = bitc::TYPE_CODE_STRUCT;
245 TypeVals.push_back(ST->isPacked());
246 // Output all of the element types.
247 for (StructType::element_iterator I = ST->element_begin(),
248 E = ST->element_end(); I != E; ++I)
249 TypeVals.push_back(VE.getTypeID(*I));
250 AbbrevToUse = StructAbbrev;
253 case Type::ArrayTyID: {
254 const ArrayType *AT = cast<ArrayType>(T);
255 // ARRAY: [numelts, eltty]
256 Code = bitc::TYPE_CODE_ARRAY;
257 TypeVals.push_back(AT->getNumElements());
258 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
259 AbbrevToUse = ArrayAbbrev;
262 case Type::VectorTyID: {
263 const VectorType *VT = cast<VectorType>(T);
264 // VECTOR [numelts, eltty]
265 Code = bitc::TYPE_CODE_VECTOR;
266 TypeVals.push_back(VT->getNumElements());
267 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
272 // Emit the finished record.
273 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
280 static unsigned getEncodedLinkage(const GlobalValue *GV) {
281 switch (GV->getLinkage()) {
282 default: llvm_unreachable("Invalid linkage!");
283 case GlobalValue::GhostLinkage: // Map ghost linkage onto external.
284 case GlobalValue::ExternalLinkage: return 0;
285 case GlobalValue::WeakAnyLinkage: return 1;
286 case GlobalValue::AppendingLinkage: return 2;
287 case GlobalValue::InternalLinkage: return 3;
288 case GlobalValue::LinkOnceAnyLinkage: return 4;
289 case GlobalValue::DLLImportLinkage: return 5;
290 case GlobalValue::DLLExportLinkage: return 6;
291 case GlobalValue::ExternalWeakLinkage: return 7;
292 case GlobalValue::CommonLinkage: return 8;
293 case GlobalValue::PrivateLinkage: return 9;
294 case GlobalValue::WeakODRLinkage: return 10;
295 case GlobalValue::LinkOnceODRLinkage: return 11;
296 case GlobalValue::AvailableExternallyLinkage: return 12;
297 case GlobalValue::LinkerPrivateLinkage: return 13;
301 static unsigned getEncodedVisibility(const GlobalValue *GV) {
302 switch (GV->getVisibility()) {
303 default: llvm_unreachable("Invalid visibility!");
304 case GlobalValue::DefaultVisibility: return 0;
305 case GlobalValue::HiddenVisibility: return 1;
306 case GlobalValue::ProtectedVisibility: return 2;
310 // Emit top-level description of module, including target triple, inline asm,
311 // descriptors for global variables, and function prototype info.
312 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
313 BitstreamWriter &Stream) {
314 // Emit the list of dependent libraries for the Module.
315 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
316 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
318 // Emit various pieces of data attached to a module.
319 if (!M->getTargetTriple().empty())
320 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
322 if (!M->getDataLayout().empty())
323 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
325 if (!M->getModuleInlineAsm().empty())
326 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
329 // Emit information about sections and GC, computing how many there are. Also
330 // compute the maximum alignment value.
331 std::map<std::string, unsigned> SectionMap;
332 std::map<std::string, unsigned> GCMap;
333 unsigned MaxAlignment = 0;
334 unsigned MaxGlobalType = 0;
335 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
337 MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
338 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
340 if (!GV->hasSection()) continue;
341 // Give section names unique ID's.
342 unsigned &Entry = SectionMap[GV->getSection()];
343 if (Entry != 0) continue;
344 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
346 Entry = SectionMap.size();
348 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
349 MaxAlignment = std::max(MaxAlignment, F->getAlignment());
350 if (F->hasSection()) {
351 // Give section names unique ID's.
352 unsigned &Entry = SectionMap[F->getSection()];
354 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
356 Entry = SectionMap.size();
360 // Same for GC names.
361 unsigned &Entry = GCMap[F->getGC()];
363 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(),
365 Entry = GCMap.size();
370 // Emit abbrev for globals, now that we know # sections and max alignment.
371 unsigned SimpleGVarAbbrev = 0;
372 if (!M->global_empty()) {
373 // Add an abbrev for common globals with no visibility or thread localness.
374 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
375 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
376 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
377 Log2_32_Ceil(MaxGlobalType+1)));
378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
379 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
380 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage.
381 if (MaxAlignment == 0) // Alignment.
382 Abbv->Add(BitCodeAbbrevOp(0));
384 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
385 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
386 Log2_32_Ceil(MaxEncAlignment+1)));
388 if (SectionMap.empty()) // Section.
389 Abbv->Add(BitCodeAbbrevOp(0));
391 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
392 Log2_32_Ceil(SectionMap.size()+1)));
393 // Don't bother emitting vis + thread local.
394 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
397 // Emit the global variable information.
398 SmallVector<unsigned, 64> Vals;
399 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
401 unsigned AbbrevToUse = 0;
403 // GLOBALVAR: [type, isconst, initid,
404 // linkage, alignment, section, visibility, threadlocal]
405 Vals.push_back(VE.getTypeID(GV->getType()));
406 Vals.push_back(GV->isConstant());
407 Vals.push_back(GV->isDeclaration() ? 0 :
408 (VE.getValueID(GV->getInitializer()) + 1));
409 Vals.push_back(getEncodedLinkage(GV));
410 Vals.push_back(Log2_32(GV->getAlignment())+1);
411 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
412 if (GV->isThreadLocal() ||
413 GV->getVisibility() != GlobalValue::DefaultVisibility) {
414 Vals.push_back(getEncodedVisibility(GV));
415 Vals.push_back(GV->isThreadLocal());
417 AbbrevToUse = SimpleGVarAbbrev;
420 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
424 // Emit the function proto information.
425 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
426 // FUNCTION: [type, callingconv, isproto, paramattr,
427 // linkage, alignment, section, visibility, gc]
428 Vals.push_back(VE.getTypeID(F->getType()));
429 Vals.push_back(F->getCallingConv());
430 Vals.push_back(F->isDeclaration());
431 Vals.push_back(getEncodedLinkage(F));
432 Vals.push_back(VE.getAttributeID(F->getAttributes()));
433 Vals.push_back(Log2_32(F->getAlignment())+1);
434 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
435 Vals.push_back(getEncodedVisibility(F));
436 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0);
438 unsigned AbbrevToUse = 0;
439 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
444 // Emit the alias information.
445 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
447 Vals.push_back(VE.getTypeID(AI->getType()));
448 Vals.push_back(VE.getValueID(AI->getAliasee()));
449 Vals.push_back(getEncodedLinkage(AI));
450 Vals.push_back(getEncodedVisibility(AI));
451 unsigned AbbrevToUse = 0;
452 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
457 static uint64_t GetOptimizationFlags(const Value *V) {
460 if (const OverflowingBinaryOperator *OBO =
461 dyn_cast<OverflowingBinaryOperator>(V)) {
462 if (OBO->hasNoSignedWrap())
463 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
464 if (OBO->hasNoUnsignedWrap())
465 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
466 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) {
468 Flags |= 1 << bitc::SDIV_EXACT;
474 static void WriteMDNode(const MDNode *N,
475 const ValueEnumerator &VE,
476 BitstreamWriter &Stream,
477 SmallVector<uint64_t, 64> &Record) {
478 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
479 if (N->getOperand(i)) {
480 Record.push_back(VE.getTypeID(N->getOperand(i)->getType()));
481 Record.push_back(VE.getValueID(N->getOperand(i)));
483 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
487 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE :
489 Stream.EmitRecord(MDCode, Record, 0);
493 static void WriteModuleMetadata(const ValueEnumerator &VE,
494 BitstreamWriter &Stream) {
495 const ValueEnumerator::ValueList &Vals = VE.getMDValues();
496 bool StartedMetadataBlock = false;
497 unsigned MDSAbbrev = 0;
498 SmallVector<uint64_t, 64> Record;
499 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
501 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
502 if (!N->isFunctionLocal()) {
503 if (!StartedMetadataBlock) {
504 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
505 StartedMetadataBlock = true;
507 WriteMDNode(N, VE, Stream, Record);
509 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
510 if (!StartedMetadataBlock) {
511 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
513 // Abbrev for METADATA_STRING.
514 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
515 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
516 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
517 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
518 MDSAbbrev = Stream.EmitAbbrev(Abbv);
519 StartedMetadataBlock = true;
522 // Code: [strchar x N]
523 Record.append(MDS->begin(), MDS->end());
525 // Emit the finished record.
526 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
528 } else if (const NamedMDNode *NMD = dyn_cast<NamedMDNode>(Vals[i].first)) {
529 if (!StartedMetadataBlock) {
530 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
531 StartedMetadataBlock = true;
535 StringRef Str = NMD->getName();
536 for (unsigned i = 0, e = Str.size(); i != e; ++i)
537 Record.push_back(Str[i]);
538 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
541 // Write named metadata operands.
542 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
543 if (NMD->getOperand(i))
544 Record.push_back(VE.getValueID(NMD->getOperand(i)));
546 Record.push_back(~0U);
548 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
553 if (StartedMetadataBlock)
557 static void WriteFunctionLocalMetadata(const ValueEnumerator &VE,
558 BitstreamWriter &Stream) {
559 bool StartedMetadataBlock = false;
560 SmallVector<uint64_t, 64> Record;
561 ValueEnumerator::ValueList Vals = VE.getMDValues();
562 ValueEnumerator::ValueList::iterator it = Vals.begin();
563 ValueEnumerator::ValueList::iterator end = Vals.end();
566 if (const MDNode *N = dyn_cast<MDNode>((*it).first)) {
567 if (N->isFunctionLocal()) {
568 if (!StartedMetadataBlock) {
569 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
570 StartedMetadataBlock = true;
572 WriteMDNode(N, VE, Stream, Record);
573 // Remove function-local MD, since it is used outside of function.
582 if (StartedMetadataBlock)
586 static void WriteMetadataAttachment(const Function &F,
587 const ValueEnumerator &VE,
588 BitstreamWriter &Stream) {
589 bool StartedMetadataBlock = false;
590 SmallVector<uint64_t, 64> Record;
592 // Write metadata attachments
593 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
594 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
596 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
597 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
600 I->getAllMetadata(MDs);
602 // If no metadata, ignore instruction.
603 if (MDs.empty()) continue;
605 Record.push_back(VE.getInstructionID(I));
607 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
608 Record.push_back(MDs[i].first);
609 Record.push_back(VE.getValueID(MDs[i].second));
611 if (!StartedMetadataBlock) {
612 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
613 StartedMetadataBlock = true;
615 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
619 if (StartedMetadataBlock)
623 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
624 SmallVector<uint64_t, 64> Record;
626 // Write metadata kinds
627 // METADATA_KIND - [n x [id, name]]
628 SmallVector<StringRef, 4> Names;
629 M->getMDKindNames(Names);
631 assert(Names[0] == "" && "MDKind #0 is invalid");
632 if (Names.size() == 1) return;
634 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
636 for (unsigned MDKindID = 1, e = Names.size(); MDKindID != e; ++MDKindID) {
637 Record.push_back(MDKindID);
638 StringRef KName = Names[MDKindID];
639 Record.append(KName.begin(), KName.end());
641 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
648 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
649 const ValueEnumerator &VE,
650 BitstreamWriter &Stream, bool isGlobal) {
651 if (FirstVal == LastVal) return;
653 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
655 unsigned AggregateAbbrev = 0;
656 unsigned String8Abbrev = 0;
657 unsigned CString7Abbrev = 0;
658 unsigned CString6Abbrev = 0;
659 // If this is a constant pool for the module, emit module-specific abbrevs.
661 // Abbrev for CST_CODE_AGGREGATE.
662 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
663 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
664 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
665 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
666 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
668 // Abbrev for CST_CODE_STRING.
669 Abbv = new BitCodeAbbrev();
670 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
671 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
672 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
673 String8Abbrev = Stream.EmitAbbrev(Abbv);
674 // Abbrev for CST_CODE_CSTRING.
675 Abbv = new BitCodeAbbrev();
676 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
677 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
678 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
679 CString7Abbrev = Stream.EmitAbbrev(Abbv);
680 // Abbrev for CST_CODE_CSTRING.
681 Abbv = new BitCodeAbbrev();
682 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
683 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
684 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
685 CString6Abbrev = Stream.EmitAbbrev(Abbv);
688 SmallVector<uint64_t, 64> Record;
690 const ValueEnumerator::ValueList &Vals = VE.getValues();
691 const Type *LastTy = 0;
692 for (unsigned i = FirstVal; i != LastVal; ++i) {
693 const Value *V = Vals[i].first;
694 // If we need to switch types, do so now.
695 if (V->getType() != LastTy) {
696 LastTy = V->getType();
697 Record.push_back(VE.getTypeID(LastTy));
698 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
699 CONSTANTS_SETTYPE_ABBREV);
703 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
704 Record.push_back(unsigned(IA->hasSideEffects()) |
705 unsigned(IA->isAlignStack()) << 1);
707 // Add the asm string.
708 const std::string &AsmStr = IA->getAsmString();
709 Record.push_back(AsmStr.size());
710 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
711 Record.push_back(AsmStr[i]);
713 // Add the constraint string.
714 const std::string &ConstraintStr = IA->getConstraintString();
715 Record.push_back(ConstraintStr.size());
716 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
717 Record.push_back(ConstraintStr[i]);
718 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
722 const Constant *C = cast<Constant>(V);
724 unsigned AbbrevToUse = 0;
725 if (C->isNullValue()) {
726 Code = bitc::CST_CODE_NULL;
727 } else if (isa<UndefValue>(C)) {
728 Code = bitc::CST_CODE_UNDEF;
729 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
730 if (IV->getBitWidth() <= 64) {
731 int64_t V = IV->getSExtValue();
733 Record.push_back(V << 1);
735 Record.push_back((-V << 1) | 1);
736 Code = bitc::CST_CODE_INTEGER;
737 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
738 } else { // Wide integers, > 64 bits in size.
739 // We have an arbitrary precision integer value to write whose
740 // bit width is > 64. However, in canonical unsigned integer
741 // format it is likely that the high bits are going to be zero.
742 // So, we only write the number of active words.
743 unsigned NWords = IV->getValue().getActiveWords();
744 const uint64_t *RawWords = IV->getValue().getRawData();
745 for (unsigned i = 0; i != NWords; ++i) {
746 int64_t V = RawWords[i];
748 Record.push_back(V << 1);
750 Record.push_back((-V << 1) | 1);
752 Code = bitc::CST_CODE_WIDE_INTEGER;
754 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
755 Code = bitc::CST_CODE_FLOAT;
756 const Type *Ty = CFP->getType();
757 if (Ty->isFloatTy() || Ty->isDoubleTy()) {
758 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
759 } else if (Ty->isX86_FP80Ty()) {
760 // api needed to prevent premature destruction
761 // bits are not in the same order as a normal i80 APInt, compensate.
762 APInt api = CFP->getValueAPF().bitcastToAPInt();
763 const uint64_t *p = api.getRawData();
764 Record.push_back((p[1] << 48) | (p[0] >> 16));
765 Record.push_back(p[0] & 0xffffLL);
766 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
767 APInt api = CFP->getValueAPF().bitcastToAPInt();
768 const uint64_t *p = api.getRawData();
769 Record.push_back(p[0]);
770 Record.push_back(p[1]);
772 assert (0 && "Unknown FP type!");
774 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
775 const ConstantArray *CA = cast<ConstantArray>(C);
776 // Emit constant strings specially.
777 unsigned NumOps = CA->getNumOperands();
778 // If this is a null-terminated string, use the denser CSTRING encoding.
779 if (CA->getOperand(NumOps-1)->isNullValue()) {
780 Code = bitc::CST_CODE_CSTRING;
781 --NumOps; // Don't encode the null, which isn't allowed by char6.
783 Code = bitc::CST_CODE_STRING;
784 AbbrevToUse = String8Abbrev;
786 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
787 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
788 for (unsigned i = 0; i != NumOps; ++i) {
789 unsigned char V = cast<ConstantInt>(CA->getOperand(i))->getZExtValue();
791 isCStr7 &= (V & 128) == 0;
793 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
797 AbbrevToUse = CString6Abbrev;
799 AbbrevToUse = CString7Abbrev;
800 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
801 isa<ConstantVector>(V)) {
802 Code = bitc::CST_CODE_AGGREGATE;
803 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
804 Record.push_back(VE.getValueID(C->getOperand(i)));
805 AbbrevToUse = AggregateAbbrev;
806 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
807 switch (CE->getOpcode()) {
809 if (Instruction::isCast(CE->getOpcode())) {
810 Code = bitc::CST_CODE_CE_CAST;
811 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
812 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
813 Record.push_back(VE.getValueID(C->getOperand(0)));
814 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
816 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
817 Code = bitc::CST_CODE_CE_BINOP;
818 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
819 Record.push_back(VE.getValueID(C->getOperand(0)));
820 Record.push_back(VE.getValueID(C->getOperand(1)));
821 uint64_t Flags = GetOptimizationFlags(CE);
823 Record.push_back(Flags);
826 case Instruction::GetElementPtr:
827 Code = bitc::CST_CODE_CE_GEP;
828 if (cast<GEPOperator>(C)->isInBounds())
829 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
830 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
831 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
832 Record.push_back(VE.getValueID(C->getOperand(i)));
835 case Instruction::Select:
836 Code = bitc::CST_CODE_CE_SELECT;
837 Record.push_back(VE.getValueID(C->getOperand(0)));
838 Record.push_back(VE.getValueID(C->getOperand(1)));
839 Record.push_back(VE.getValueID(C->getOperand(2)));
841 case Instruction::ExtractElement:
842 Code = bitc::CST_CODE_CE_EXTRACTELT;
843 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
844 Record.push_back(VE.getValueID(C->getOperand(0)));
845 Record.push_back(VE.getValueID(C->getOperand(1)));
847 case Instruction::InsertElement:
848 Code = bitc::CST_CODE_CE_INSERTELT;
849 Record.push_back(VE.getValueID(C->getOperand(0)));
850 Record.push_back(VE.getValueID(C->getOperand(1)));
851 Record.push_back(VE.getValueID(C->getOperand(2)));
853 case Instruction::ShuffleVector:
854 // If the return type and argument types are the same, this is a
855 // standard shufflevector instruction. If the types are different,
856 // then the shuffle is widening or truncating the input vectors, and
857 // the argument type must also be encoded.
858 if (C->getType() == C->getOperand(0)->getType()) {
859 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
861 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
862 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
864 Record.push_back(VE.getValueID(C->getOperand(0)));
865 Record.push_back(VE.getValueID(C->getOperand(1)));
866 Record.push_back(VE.getValueID(C->getOperand(2)));
868 case Instruction::ICmp:
869 case Instruction::FCmp:
870 Code = bitc::CST_CODE_CE_CMP;
871 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
872 Record.push_back(VE.getValueID(C->getOperand(0)));
873 Record.push_back(VE.getValueID(C->getOperand(1)));
874 Record.push_back(CE->getPredicate());
877 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
878 assert(BA->getFunction() == BA->getBasicBlock()->getParent() &&
879 "Malformed blockaddress");
880 Code = bitc::CST_CODE_BLOCKADDRESS;
881 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
882 Record.push_back(VE.getValueID(BA->getFunction()));
883 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
885 llvm_unreachable("Unknown constant!");
887 Stream.EmitRecord(Code, Record, AbbrevToUse);
894 static void WriteModuleConstants(const ValueEnumerator &VE,
895 BitstreamWriter &Stream) {
896 const ValueEnumerator::ValueList &Vals = VE.getValues();
898 // Find the first constant to emit, which is the first non-globalvalue value.
899 // We know globalvalues have been emitted by WriteModuleInfo.
900 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
901 if (!isa<GlobalValue>(Vals[i].first)) {
902 WriteConstants(i, Vals.size(), VE, Stream, true);
908 /// PushValueAndType - The file has to encode both the value and type id for
909 /// many values, because we need to know what type to create for forward
910 /// references. However, most operands are not forward references, so this type
911 /// field is not needed.
913 /// This function adds V's value ID to Vals. If the value ID is higher than the
914 /// instruction ID, then it is a forward reference, and it also includes the
916 static bool PushValueAndType(const Value *V, unsigned InstID,
917 SmallVector<unsigned, 64> &Vals,
918 ValueEnumerator &VE) {
919 unsigned ValID = VE.getValueID(V);
920 Vals.push_back(ValID);
921 if (ValID >= InstID) {
922 Vals.push_back(VE.getTypeID(V->getType()));
928 /// WriteInstruction - Emit an instruction to the specified stream.
929 static void WriteInstruction(const Instruction &I, unsigned InstID,
930 ValueEnumerator &VE, BitstreamWriter &Stream,
931 SmallVector<unsigned, 64> &Vals) {
933 unsigned AbbrevToUse = 0;
934 VE.setInstructionID(&I);
935 switch (I.getOpcode()) {
937 if (Instruction::isCast(I.getOpcode())) {
938 Code = bitc::FUNC_CODE_INST_CAST;
939 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
940 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
941 Vals.push_back(VE.getTypeID(I.getType()));
942 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
944 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
945 Code = bitc::FUNC_CODE_INST_BINOP;
946 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
947 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
948 Vals.push_back(VE.getValueID(I.getOperand(1)));
949 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
950 uint64_t Flags = GetOptimizationFlags(&I);
952 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
953 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
954 Vals.push_back(Flags);
959 case Instruction::GetElementPtr:
960 Code = bitc::FUNC_CODE_INST_GEP;
961 if (cast<GEPOperator>(&I)->isInBounds())
962 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP;
963 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
964 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
966 case Instruction::ExtractValue: {
967 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
968 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
969 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
970 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
974 case Instruction::InsertValue: {
975 Code = bitc::FUNC_CODE_INST_INSERTVAL;
976 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
977 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
978 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
979 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
983 case Instruction::Select:
984 Code = bitc::FUNC_CODE_INST_VSELECT;
985 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
986 Vals.push_back(VE.getValueID(I.getOperand(2)));
987 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
989 case Instruction::ExtractElement:
990 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
991 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
992 Vals.push_back(VE.getValueID(I.getOperand(1)));
994 case Instruction::InsertElement:
995 Code = bitc::FUNC_CODE_INST_INSERTELT;
996 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
997 Vals.push_back(VE.getValueID(I.getOperand(1)));
998 Vals.push_back(VE.getValueID(I.getOperand(2)));
1000 case Instruction::ShuffleVector:
1001 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
1002 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1003 Vals.push_back(VE.getValueID(I.getOperand(1)));
1004 Vals.push_back(VE.getValueID(I.getOperand(2)));
1006 case Instruction::ICmp:
1007 case Instruction::FCmp:
1008 // compare returning Int1Ty or vector of Int1Ty
1009 Code = bitc::FUNC_CODE_INST_CMP2;
1010 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1011 Vals.push_back(VE.getValueID(I.getOperand(1)));
1012 Vals.push_back(cast<CmpInst>(I).getPredicate());
1015 case Instruction::Ret:
1017 Code = bitc::FUNC_CODE_INST_RET;
1018 unsigned NumOperands = I.getNumOperands();
1019 if (NumOperands == 0)
1020 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
1021 else if (NumOperands == 1) {
1022 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1023 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
1025 for (unsigned i = 0, e = NumOperands; i != e; ++i)
1026 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1030 case Instruction::Br:
1032 Code = bitc::FUNC_CODE_INST_BR;
1033 BranchInst &II = cast<BranchInst>(I);
1034 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
1035 if (II.isConditional()) {
1036 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
1037 Vals.push_back(VE.getValueID(II.getCondition()));
1041 case Instruction::Switch:
1042 Code = bitc::FUNC_CODE_INST_SWITCH;
1043 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1044 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1045 Vals.push_back(VE.getValueID(I.getOperand(i)));
1047 case Instruction::IndirectBr:
1048 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
1049 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1050 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1051 Vals.push_back(VE.getValueID(I.getOperand(i)));
1054 case Instruction::Invoke: {
1055 const InvokeInst *II = cast<InvokeInst>(&I);
1056 const Value *Callee(II->getCalledValue());
1057 const PointerType *PTy = cast<PointerType>(Callee->getType());
1058 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1059 Code = bitc::FUNC_CODE_INST_INVOKE;
1061 Vals.push_back(VE.getAttributeID(II->getAttributes()));
1062 Vals.push_back(II->getCallingConv());
1063 Vals.push_back(VE.getValueID(II->getNormalDest()));
1064 Vals.push_back(VE.getValueID(II->getUnwindDest()));
1065 PushValueAndType(Callee, InstID, Vals, VE);
1067 // Emit value #'s for the fixed parameters.
1068 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1069 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param.
1071 // Emit type/value pairs for varargs params.
1072 if (FTy->isVarArg()) {
1073 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands();
1075 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
1079 case Instruction::Unwind:
1080 Code = bitc::FUNC_CODE_INST_UNWIND;
1082 case Instruction::Unreachable:
1083 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
1084 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
1087 case Instruction::PHI:
1088 Code = bitc::FUNC_CODE_INST_PHI;
1089 Vals.push_back(VE.getTypeID(I.getType()));
1090 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1091 Vals.push_back(VE.getValueID(I.getOperand(i)));
1094 case Instruction::Alloca:
1095 Code = bitc::FUNC_CODE_INST_ALLOCA;
1096 Vals.push_back(VE.getTypeID(I.getType()));
1097 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1098 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
1101 case Instruction::Load:
1102 Code = bitc::FUNC_CODE_INST_LOAD;
1103 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1104 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1106 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1107 Vals.push_back(cast<LoadInst>(I).isVolatile());
1109 case Instruction::Store:
1110 Code = bitc::FUNC_CODE_INST_STORE2;
1111 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1112 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
1113 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1114 Vals.push_back(cast<StoreInst>(I).isVolatile());
1116 case Instruction::Call: {
1117 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
1118 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1120 Code = bitc::FUNC_CODE_INST_CALL;
1122 const CallInst *CI = cast<CallInst>(&I);
1123 Vals.push_back(VE.getAttributeID(CI->getAttributes()));
1124 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall()));
1125 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee
1127 // Emit value #'s for the fixed parameters.
1128 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1129 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param.
1131 // Emit type/value pairs for varargs params.
1132 if (FTy->isVarArg()) {
1133 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams();
1134 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands();
1136 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs
1140 case Instruction::VAArg:
1141 Code = bitc::FUNC_CODE_INST_VAARG;
1142 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
1143 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
1144 Vals.push_back(VE.getTypeID(I.getType())); // restype.
1148 Stream.EmitRecord(Code, Vals, AbbrevToUse);
1152 // Emit names for globals/functions etc.
1153 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
1154 const ValueEnumerator &VE,
1155 BitstreamWriter &Stream) {
1156 if (VST.empty()) return;
1157 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
1159 // FIXME: Set up the abbrev, we know how many values there are!
1160 // FIXME: We know if the type names can use 7-bit ascii.
1161 SmallVector<unsigned, 64> NameVals;
1163 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
1166 const ValueName &Name = *SI;
1168 // Figure out the encoding to use for the name.
1170 bool isChar6 = true;
1171 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
1174 isChar6 = BitCodeAbbrevOp::isChar6(*C);
1175 if ((unsigned char)*C & 128) {
1177 break; // don't bother scanning the rest.
1181 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
1183 // VST_ENTRY: [valueid, namechar x N]
1184 // VST_BBENTRY: [bbid, namechar x N]
1186 if (isa<BasicBlock>(SI->getValue())) {
1187 Code = bitc::VST_CODE_BBENTRY;
1189 AbbrevToUse = VST_BBENTRY_6_ABBREV;
1191 Code = bitc::VST_CODE_ENTRY;
1193 AbbrevToUse = VST_ENTRY_6_ABBREV;
1195 AbbrevToUse = VST_ENTRY_7_ABBREV;
1198 NameVals.push_back(VE.getValueID(SI->getValue()));
1199 for (const char *P = Name.getKeyData(),
1200 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
1201 NameVals.push_back((unsigned char)*P);
1203 // Emit the finished record.
1204 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
1210 /// WriteFunction - Emit a function body to the module stream.
1211 static void WriteFunction(const Function &F, ValueEnumerator &VE,
1212 BitstreamWriter &Stream) {
1213 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
1214 VE.incorporateFunction(F);
1216 SmallVector<unsigned, 64> Vals;
1218 // Emit the number of basic blocks, so the reader can create them ahead of
1220 Vals.push_back(VE.getBasicBlocks().size());
1221 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
1224 // If there are function-local constants, emit them now.
1225 unsigned CstStart, CstEnd;
1226 VE.getFunctionConstantRange(CstStart, CstEnd);
1227 WriteConstants(CstStart, CstEnd, VE, Stream, false);
1229 // Keep a running idea of what the instruction ID is.
1230 unsigned InstID = CstEnd;
1232 // Finally, emit all the instructions, in order.
1233 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
1234 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
1236 WriteInstruction(*I, InstID, VE, Stream, Vals);
1237 if (!I->getType()->isVoidTy())
1241 // Emit names for all the instructions etc.
1242 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1244 WriteFunctionLocalMetadata(VE, Stream);
1245 WriteMetadataAttachment(F, VE, Stream);
1250 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
1251 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
1252 const ValueEnumerator &VE,
1253 BitstreamWriter &Stream) {
1254 if (TST.empty()) return;
1256 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
1258 // 7-bit fixed width VST_CODE_ENTRY strings.
1259 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1260 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1261 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1262 Log2_32_Ceil(VE.getTypes().size()+1)));
1263 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1264 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1265 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
1267 SmallVector<unsigned, 64> NameVals;
1269 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1271 // TST_ENTRY: [typeid, namechar x N]
1272 NameVals.push_back(VE.getTypeID(TI->second));
1274 const std::string &Str = TI->first;
1276 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1277 NameVals.push_back((unsigned char)Str[i]);
1282 // Emit the finished record.
1283 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1290 // Emit blockinfo, which defines the standard abbreviations etc.
1291 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1292 // We only want to emit block info records for blocks that have multiple
1293 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1294 // blocks can defined their abbrevs inline.
1295 Stream.EnterBlockInfoBlock(2);
1297 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1298 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1299 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1300 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1301 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1302 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1303 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1304 Abbv) != VST_ENTRY_8_ABBREV)
1305 llvm_unreachable("Unexpected abbrev ordering!");
1308 { // 7-bit fixed width VST_ENTRY strings.
1309 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1310 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1311 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1312 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1313 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1314 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1315 Abbv) != VST_ENTRY_7_ABBREV)
1316 llvm_unreachable("Unexpected abbrev ordering!");
1318 { // 6-bit char6 VST_ENTRY strings.
1319 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1320 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1321 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1322 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1323 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1324 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1325 Abbv) != VST_ENTRY_6_ABBREV)
1326 llvm_unreachable("Unexpected abbrev ordering!");
1328 { // 6-bit char6 VST_BBENTRY strings.
1329 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1330 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1331 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1332 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1333 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1334 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1335 Abbv) != VST_BBENTRY_6_ABBREV)
1336 llvm_unreachable("Unexpected abbrev ordering!");
1341 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1342 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1343 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1344 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1345 Log2_32_Ceil(VE.getTypes().size()+1)));
1346 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1347 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1348 llvm_unreachable("Unexpected abbrev ordering!");
1351 { // INTEGER abbrev for CONSTANTS_BLOCK.
1352 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1353 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1354 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1355 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1356 Abbv) != CONSTANTS_INTEGER_ABBREV)
1357 llvm_unreachable("Unexpected abbrev ordering!");
1360 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1361 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1362 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1363 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1364 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1365 Log2_32_Ceil(VE.getTypes().size()+1)));
1366 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1368 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1369 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1370 llvm_unreachable("Unexpected abbrev ordering!");
1372 { // NULL abbrev for CONSTANTS_BLOCK.
1373 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1374 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1375 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1376 Abbv) != CONSTANTS_NULL_Abbrev)
1377 llvm_unreachable("Unexpected abbrev ordering!");
1380 // FIXME: This should only use space for first class types!
1382 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1383 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1384 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1385 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1386 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1387 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1388 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1389 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1390 llvm_unreachable("Unexpected abbrev ordering!");
1392 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1393 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1394 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1395 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1396 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1397 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1398 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1399 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1400 llvm_unreachable("Unexpected abbrev ordering!");
1402 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1403 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1404 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1405 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1406 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1407 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1408 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1409 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1410 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1411 llvm_unreachable("Unexpected abbrev ordering!");
1413 { // INST_CAST abbrev for FUNCTION_BLOCK.
1414 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1415 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1416 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1417 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1418 Log2_32_Ceil(VE.getTypes().size()+1)));
1419 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1420 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1421 Abbv) != FUNCTION_INST_CAST_ABBREV)
1422 llvm_unreachable("Unexpected abbrev ordering!");
1425 { // INST_RET abbrev for FUNCTION_BLOCK.
1426 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1427 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1428 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1429 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1430 llvm_unreachable("Unexpected abbrev ordering!");
1432 { // INST_RET abbrev for FUNCTION_BLOCK.
1433 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1434 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1435 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1436 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1437 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1438 llvm_unreachable("Unexpected abbrev ordering!");
1440 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1441 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1442 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1443 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1444 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1445 llvm_unreachable("Unexpected abbrev ordering!");
1452 /// WriteModule - Emit the specified module to the bitstream.
1453 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1454 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1456 // Emit the version number if it is non-zero.
1458 SmallVector<unsigned, 1> Vals;
1459 Vals.push_back(CurVersion);
1460 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1463 // Analyze the module, enumerating globals, functions, etc.
1464 ValueEnumerator VE(M);
1466 // Emit blockinfo, which defines the standard abbreviations etc.
1467 WriteBlockInfo(VE, Stream);
1469 // Emit information about parameter attributes.
1470 WriteAttributeTable(VE, Stream);
1472 // Emit information describing all of the types in the module.
1473 WriteTypeTable(VE, Stream);
1475 // Emit top-level description of module, including target triple, inline asm,
1476 // descriptors for global variables, and function prototype info.
1477 WriteModuleInfo(M, VE, Stream);
1480 WriteModuleConstants(VE, Stream);
1483 WriteModuleMetadata(VE, Stream);
1485 // Emit function bodies.
1486 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1487 if (!I->isDeclaration())
1488 WriteFunction(*I, VE, Stream);
1491 WriteModuleMetadataStore(M, Stream);
1493 // Emit the type symbol table information.
1494 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1496 // Emit names for globals/functions etc.
1497 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1502 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1503 /// header and trailer to make it compatible with the system archiver. To do
1504 /// this we emit the following header, and then emit a trailer that pads the
1505 /// file out to be a multiple of 16 bytes.
1507 /// struct bc_header {
1508 /// uint32_t Magic; // 0x0B17C0DE
1509 /// uint32_t Version; // Version, currently always 0.
1510 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1511 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1512 /// uint32_t CPUType; // CPU specifier.
1513 /// ... potentially more later ...
1516 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
1517 DarwinBCHeaderSize = 5*4
1520 static void EmitDarwinBCHeader(BitstreamWriter &Stream,
1521 const std::string &TT) {
1522 unsigned CPUType = ~0U;
1524 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*. The CPUType is a
1525 // magic number from /usr/include/mach/machine.h. It is ok to reproduce the
1526 // specific constants here because they are implicitly part of the Darwin ABI.
1528 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
1529 DARWIN_CPU_TYPE_X86 = 7,
1530 DARWIN_CPU_TYPE_POWERPC = 18
1533 if (TT.find("x86_64-") == 0)
1534 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
1535 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
1536 TT[4] == '-' && TT[1] - '3' < 6)
1537 CPUType = DARWIN_CPU_TYPE_X86;
1538 else if (TT.find("powerpc-") == 0)
1539 CPUType = DARWIN_CPU_TYPE_POWERPC;
1540 else if (TT.find("powerpc64-") == 0)
1541 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
1543 // Traditional Bitcode starts after header.
1544 unsigned BCOffset = DarwinBCHeaderSize;
1546 Stream.Emit(0x0B17C0DE, 32);
1547 Stream.Emit(0 , 32); // Version.
1548 Stream.Emit(BCOffset , 32);
1549 Stream.Emit(0 , 32); // Filled in later.
1550 Stream.Emit(CPUType , 32);
1553 /// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and
1554 /// finalize the header.
1555 static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) {
1556 // Update the size field in the header.
1557 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize);
1559 // If the file is not a multiple of 16 bytes, insert dummy padding.
1560 while (BufferSize & 15) {
1567 /// WriteBitcodeToFile - Write the specified module to the specified output
1569 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
1570 std::vector<unsigned char> Buffer;
1571 BitstreamWriter Stream(Buffer);
1573 Buffer.reserve(256*1024);
1575 WriteBitcodeToStream( M, Stream );
1577 // If writing to stdout, set binary mode.
1578 if (&llvm::outs() == &Out)
1579 sys::Program::ChangeStdoutToBinary();
1581 // Write the generated bitstream to "Out".
1582 Out.write((char*)&Buffer.front(), Buffer.size());
1584 // Make sure it hits disk now.
1588 /// WriteBitcodeToStream - Write the specified module to the specified output
1590 void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) {
1591 // If this is darwin, emit a file header and trailer if needed.
1592 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos;
1594 EmitDarwinBCHeader(Stream, M->getTargetTriple());
1596 // Emit the file header.
1597 Stream.Emit((unsigned)'B', 8);
1598 Stream.Emit((unsigned)'C', 8);
1599 Stream.Emit(0x0, 4);
1600 Stream.Emit(0xC, 4);
1601 Stream.Emit(0xE, 4);
1602 Stream.Emit(0xD, 4);
1605 WriteModule(M, Stream);
1608 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());