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::ExternalLinkage: return 0;
284 case GlobalValue::WeakAnyLinkage: return 1;
285 case GlobalValue::AppendingLinkage: return 2;
286 case GlobalValue::InternalLinkage: return 3;
287 case GlobalValue::LinkOnceAnyLinkage: return 4;
288 case GlobalValue::DLLImportLinkage: return 5;
289 case GlobalValue::DLLExportLinkage: return 6;
290 case GlobalValue::ExternalWeakLinkage: return 7;
291 case GlobalValue::CommonLinkage: return 8;
292 case GlobalValue::PrivateLinkage: return 9;
293 case GlobalValue::WeakODRLinkage: return 10;
294 case GlobalValue::LinkOnceODRLinkage: return 11;
295 case GlobalValue::AvailableExternallyLinkage: return 12;
296 case GlobalValue::LinkerPrivateLinkage: return 13;
297 case GlobalValue::LinkerPrivateWeakLinkage: return 14;
298 case GlobalValue::LinkerPrivateWeakDefAutoLinkage: return 15;
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->getNumOperands(); i != e; ++i) {
480 if (N->getOperand(i)) {
481 Record.push_back(VE.getTypeID(N->getOperand(i)->getType()));
482 Record.push_back(VE.getValueID(N->getOperand(i)));
484 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
488 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE2 :
489 bitc::METADATA_NODE2;
490 Stream.EmitRecord(MDCode, Record, 0);
494 static void WriteModuleMetadata(const Module *M,
495 const ValueEnumerator &VE,
496 BitstreamWriter &Stream) {
497 const ValueEnumerator::ValueList &Vals = VE.getMDValues();
498 bool StartedMetadataBlock = false;
499 unsigned MDSAbbrev = 0;
500 SmallVector<uint64_t, 64> Record;
501 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
503 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
504 if (!N->isFunctionLocal() || !N->getFunction()) {
505 if (!StartedMetadataBlock) {
506 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
507 StartedMetadataBlock = true;
509 WriteMDNode(N, VE, Stream, Record);
511 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
512 if (!StartedMetadataBlock) {
513 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
515 // Abbrev for METADATA_STRING.
516 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
517 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
518 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
519 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
520 MDSAbbrev = Stream.EmitAbbrev(Abbv);
521 StartedMetadataBlock = true;
524 // Code: [strchar x N]
525 Record.append(MDS->begin(), MDS->end());
527 // Emit the finished record.
528 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
533 // Write named metadata.
534 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
535 E = M->named_metadata_end(); I != E; ++I) {
536 const NamedMDNode *NMD = I;
537 if (!StartedMetadataBlock) {
538 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
539 StartedMetadataBlock = true;
543 StringRef Str = NMD->getName();
544 for (unsigned i = 0, e = Str.size(); i != e; ++i)
545 Record.push_back(Str[i]);
546 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
549 // Write named metadata operands.
550 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
551 Record.push_back(VE.getValueID(NMD->getOperand(i)));
552 Stream.EmitRecord(bitc::METADATA_NAMED_NODE2, Record, 0);
556 if (StartedMetadataBlock)
560 static void WriteFunctionLocalMetadata(const Function &F,
561 const ValueEnumerator &VE,
562 BitstreamWriter &Stream) {
563 bool StartedMetadataBlock = false;
564 SmallVector<uint64_t, 64> Record;
565 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues();
566 for (unsigned i = 0, e = Vals.size(); i != e; ++i)
567 if (const MDNode *N = Vals[i])
568 if (N->isFunctionLocal() && N->getFunction() == &F) {
569 if (!StartedMetadataBlock) {
570 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
571 StartedMetadataBlock = true;
573 WriteMDNode(N, VE, Stream, Record);
576 if (StartedMetadataBlock)
580 static void WriteMetadataAttachment(const Function &F,
581 const ValueEnumerator &VE,
582 BitstreamWriter &Stream) {
583 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
585 SmallVector<uint64_t, 64> Record;
587 // Write metadata attachments
588 // METADATA_ATTACHMENT2 - [m x [value, [n x [id, mdnode]]]
589 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
591 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
592 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
595 I->getAllMetadataOtherThanDebugLoc(MDs);
597 // If no metadata, ignore instruction.
598 if (MDs.empty()) continue;
600 Record.push_back(VE.getInstructionID(I));
602 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
603 Record.push_back(MDs[i].first);
604 Record.push_back(VE.getValueID(MDs[i].second));
606 Stream.EmitRecord(bitc::METADATA_ATTACHMENT2, Record, 0);
613 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
614 SmallVector<uint64_t, 64> Record;
616 // Write metadata kinds
617 // METADATA_KIND - [n x [id, name]]
618 SmallVector<StringRef, 4> Names;
619 M->getMDKindNames(Names);
621 if (Names.empty()) return;
623 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
625 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
626 Record.push_back(MDKindID);
627 StringRef KName = Names[MDKindID];
628 Record.append(KName.begin(), KName.end());
630 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
637 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
638 const ValueEnumerator &VE,
639 BitstreamWriter &Stream, bool isGlobal) {
640 if (FirstVal == LastVal) return;
642 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
644 unsigned AggregateAbbrev = 0;
645 unsigned String8Abbrev = 0;
646 unsigned CString7Abbrev = 0;
647 unsigned CString6Abbrev = 0;
648 // If this is a constant pool for the module, emit module-specific abbrevs.
650 // Abbrev for CST_CODE_AGGREGATE.
651 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
652 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
653 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
654 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
655 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
657 // Abbrev for CST_CODE_STRING.
658 Abbv = new BitCodeAbbrev();
659 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
660 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
661 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
662 String8Abbrev = Stream.EmitAbbrev(Abbv);
663 // Abbrev for CST_CODE_CSTRING.
664 Abbv = new BitCodeAbbrev();
665 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
666 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
667 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
668 CString7Abbrev = Stream.EmitAbbrev(Abbv);
669 // Abbrev for CST_CODE_CSTRING.
670 Abbv = new BitCodeAbbrev();
671 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
672 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
673 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
674 CString6Abbrev = Stream.EmitAbbrev(Abbv);
677 SmallVector<uint64_t, 64> Record;
679 const ValueEnumerator::ValueList &Vals = VE.getValues();
680 const Type *LastTy = 0;
681 for (unsigned i = FirstVal; i != LastVal; ++i) {
682 const Value *V = Vals[i].first;
683 // If we need to switch types, do so now.
684 if (V->getType() != LastTy) {
685 LastTy = V->getType();
686 Record.push_back(VE.getTypeID(LastTy));
687 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
688 CONSTANTS_SETTYPE_ABBREV);
692 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
693 Record.push_back(unsigned(IA->hasSideEffects()) |
694 unsigned(IA->isAlignStack()) << 1);
696 // Add the asm string.
697 const std::string &AsmStr = IA->getAsmString();
698 Record.push_back(AsmStr.size());
699 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
700 Record.push_back(AsmStr[i]);
702 // Add the constraint string.
703 const std::string &ConstraintStr = IA->getConstraintString();
704 Record.push_back(ConstraintStr.size());
705 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
706 Record.push_back(ConstraintStr[i]);
707 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
711 const Constant *C = cast<Constant>(V);
713 unsigned AbbrevToUse = 0;
714 if (C->isNullValue()) {
715 Code = bitc::CST_CODE_NULL;
716 } else if (isa<UndefValue>(C)) {
717 Code = bitc::CST_CODE_UNDEF;
718 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
719 if (IV->getBitWidth() <= 64) {
720 uint64_t V = IV->getSExtValue();
722 Record.push_back(V << 1);
724 Record.push_back((-V << 1) | 1);
725 Code = bitc::CST_CODE_INTEGER;
726 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
727 } else { // Wide integers, > 64 bits in size.
728 // We have an arbitrary precision integer value to write whose
729 // bit width is > 64. However, in canonical unsigned integer
730 // format it is likely that the high bits are going to be zero.
731 // So, we only write the number of active words.
732 unsigned NWords = IV->getValue().getActiveWords();
733 const uint64_t *RawWords = IV->getValue().getRawData();
734 for (unsigned i = 0; i != NWords; ++i) {
735 int64_t V = RawWords[i];
737 Record.push_back(V << 1);
739 Record.push_back((-V << 1) | 1);
741 Code = bitc::CST_CODE_WIDE_INTEGER;
743 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
744 Code = bitc::CST_CODE_FLOAT;
745 const Type *Ty = CFP->getType();
746 if (Ty->isFloatTy() || Ty->isDoubleTy()) {
747 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
748 } else if (Ty->isX86_FP80Ty()) {
749 // api needed to prevent premature destruction
750 // bits are not in the same order as a normal i80 APInt, compensate.
751 APInt api = CFP->getValueAPF().bitcastToAPInt();
752 const uint64_t *p = api.getRawData();
753 Record.push_back((p[1] << 48) | (p[0] >> 16));
754 Record.push_back(p[0] & 0xffffLL);
755 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
756 APInt api = CFP->getValueAPF().bitcastToAPInt();
757 const uint64_t *p = api.getRawData();
758 Record.push_back(p[0]);
759 Record.push_back(p[1]);
761 assert (0 && "Unknown FP type!");
763 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
764 const ConstantArray *CA = cast<ConstantArray>(C);
765 // Emit constant strings specially.
766 unsigned NumOps = CA->getNumOperands();
767 // If this is a null-terminated string, use the denser CSTRING encoding.
768 if (CA->getOperand(NumOps-1)->isNullValue()) {
769 Code = bitc::CST_CODE_CSTRING;
770 --NumOps; // Don't encode the null, which isn't allowed by char6.
772 Code = bitc::CST_CODE_STRING;
773 AbbrevToUse = String8Abbrev;
775 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
776 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
777 for (unsigned i = 0; i != NumOps; ++i) {
778 unsigned char V = cast<ConstantInt>(CA->getOperand(i))->getZExtValue();
780 isCStr7 &= (V & 128) == 0;
782 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
786 AbbrevToUse = CString6Abbrev;
788 AbbrevToUse = CString7Abbrev;
789 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
790 isa<ConstantVector>(V)) {
791 Code = bitc::CST_CODE_AGGREGATE;
792 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
793 Record.push_back(VE.getValueID(C->getOperand(i)));
794 AbbrevToUse = AggregateAbbrev;
795 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
796 switch (CE->getOpcode()) {
798 if (Instruction::isCast(CE->getOpcode())) {
799 Code = bitc::CST_CODE_CE_CAST;
800 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
801 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
802 Record.push_back(VE.getValueID(C->getOperand(0)));
803 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
805 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
806 Code = bitc::CST_CODE_CE_BINOP;
807 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
808 Record.push_back(VE.getValueID(C->getOperand(0)));
809 Record.push_back(VE.getValueID(C->getOperand(1)));
810 uint64_t Flags = GetOptimizationFlags(CE);
812 Record.push_back(Flags);
815 case Instruction::GetElementPtr:
816 Code = bitc::CST_CODE_CE_GEP;
817 if (cast<GEPOperator>(C)->isInBounds())
818 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
819 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
820 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
821 Record.push_back(VE.getValueID(C->getOperand(i)));
824 case Instruction::Select:
825 Code = bitc::CST_CODE_CE_SELECT;
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::ExtractElement:
831 Code = bitc::CST_CODE_CE_EXTRACTELT;
832 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
833 Record.push_back(VE.getValueID(C->getOperand(0)));
834 Record.push_back(VE.getValueID(C->getOperand(1)));
836 case Instruction::InsertElement:
837 Code = bitc::CST_CODE_CE_INSERTELT;
838 Record.push_back(VE.getValueID(C->getOperand(0)));
839 Record.push_back(VE.getValueID(C->getOperand(1)));
840 Record.push_back(VE.getValueID(C->getOperand(2)));
842 case Instruction::ShuffleVector:
843 // If the return type and argument types are the same, this is a
844 // standard shufflevector instruction. If the types are different,
845 // then the shuffle is widening or truncating the input vectors, and
846 // the argument type must also be encoded.
847 if (C->getType() == C->getOperand(0)->getType()) {
848 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
850 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
851 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
853 Record.push_back(VE.getValueID(C->getOperand(0)));
854 Record.push_back(VE.getValueID(C->getOperand(1)));
855 Record.push_back(VE.getValueID(C->getOperand(2)));
857 case Instruction::ICmp:
858 case Instruction::FCmp:
859 Code = bitc::CST_CODE_CE_CMP;
860 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
861 Record.push_back(VE.getValueID(C->getOperand(0)));
862 Record.push_back(VE.getValueID(C->getOperand(1)));
863 Record.push_back(CE->getPredicate());
866 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
867 assert(BA->getFunction() == BA->getBasicBlock()->getParent() &&
868 "Malformed blockaddress");
869 Code = bitc::CST_CODE_BLOCKADDRESS;
870 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
871 Record.push_back(VE.getValueID(BA->getFunction()));
872 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
877 llvm_unreachable("Unknown constant!");
879 Stream.EmitRecord(Code, Record, AbbrevToUse);
886 static void WriteModuleConstants(const ValueEnumerator &VE,
887 BitstreamWriter &Stream) {
888 const ValueEnumerator::ValueList &Vals = VE.getValues();
890 // Find the first constant to emit, which is the first non-globalvalue value.
891 // We know globalvalues have been emitted by WriteModuleInfo.
892 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
893 if (!isa<GlobalValue>(Vals[i].first)) {
894 WriteConstants(i, Vals.size(), VE, Stream, true);
900 /// PushValueAndType - The file has to encode both the value and type id for
901 /// many values, because we need to know what type to create for forward
902 /// references. However, most operands are not forward references, so this type
903 /// field is not needed.
905 /// This function adds V's value ID to Vals. If the value ID is higher than the
906 /// instruction ID, then it is a forward reference, and it also includes the
908 static bool PushValueAndType(const Value *V, unsigned InstID,
909 SmallVector<unsigned, 64> &Vals,
910 ValueEnumerator &VE) {
911 unsigned ValID = VE.getValueID(V);
912 Vals.push_back(ValID);
913 if (ValID >= InstID) {
914 Vals.push_back(VE.getTypeID(V->getType()));
920 /// WriteInstruction - Emit an instruction to the specified stream.
921 static void WriteInstruction(const Instruction &I, unsigned InstID,
922 ValueEnumerator &VE, BitstreamWriter &Stream,
923 SmallVector<unsigned, 64> &Vals) {
925 unsigned AbbrevToUse = 0;
926 VE.setInstructionID(&I);
927 switch (I.getOpcode()) {
929 if (Instruction::isCast(I.getOpcode())) {
930 Code = bitc::FUNC_CODE_INST_CAST;
931 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
932 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
933 Vals.push_back(VE.getTypeID(I.getType()));
934 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
936 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
937 Code = bitc::FUNC_CODE_INST_BINOP;
938 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
939 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
940 Vals.push_back(VE.getValueID(I.getOperand(1)));
941 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
942 uint64_t Flags = GetOptimizationFlags(&I);
944 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
945 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
946 Vals.push_back(Flags);
951 case Instruction::GetElementPtr:
952 Code = bitc::FUNC_CODE_INST_GEP;
953 if (cast<GEPOperator>(&I)->isInBounds())
954 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP;
955 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
956 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
958 case Instruction::ExtractValue: {
959 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
960 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
961 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
962 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
966 case Instruction::InsertValue: {
967 Code = bitc::FUNC_CODE_INST_INSERTVAL;
968 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
969 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
970 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
971 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
975 case Instruction::Select:
976 Code = bitc::FUNC_CODE_INST_VSELECT;
977 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
978 Vals.push_back(VE.getValueID(I.getOperand(2)));
979 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
981 case Instruction::ExtractElement:
982 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
983 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
984 Vals.push_back(VE.getValueID(I.getOperand(1)));
986 case Instruction::InsertElement:
987 Code = bitc::FUNC_CODE_INST_INSERTELT;
988 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
989 Vals.push_back(VE.getValueID(I.getOperand(1)));
990 Vals.push_back(VE.getValueID(I.getOperand(2)));
992 case Instruction::ShuffleVector:
993 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
994 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
995 Vals.push_back(VE.getValueID(I.getOperand(1)));
996 Vals.push_back(VE.getValueID(I.getOperand(2)));
998 case Instruction::ICmp:
999 case Instruction::FCmp:
1000 // compare returning Int1Ty or vector of Int1Ty
1001 Code = bitc::FUNC_CODE_INST_CMP2;
1002 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1003 Vals.push_back(VE.getValueID(I.getOperand(1)));
1004 Vals.push_back(cast<CmpInst>(I).getPredicate());
1007 case Instruction::Ret:
1009 Code = bitc::FUNC_CODE_INST_RET;
1010 unsigned NumOperands = I.getNumOperands();
1011 if (NumOperands == 0)
1012 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
1013 else if (NumOperands == 1) {
1014 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1015 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
1017 for (unsigned i = 0, e = NumOperands; i != e; ++i)
1018 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1022 case Instruction::Br:
1024 Code = bitc::FUNC_CODE_INST_BR;
1025 BranchInst &II = cast<BranchInst>(I);
1026 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
1027 if (II.isConditional()) {
1028 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
1029 Vals.push_back(VE.getValueID(II.getCondition()));
1033 case Instruction::Switch:
1034 Code = bitc::FUNC_CODE_INST_SWITCH;
1035 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1036 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1037 Vals.push_back(VE.getValueID(I.getOperand(i)));
1039 case Instruction::IndirectBr:
1040 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
1041 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1042 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1043 Vals.push_back(VE.getValueID(I.getOperand(i)));
1046 case Instruction::Invoke: {
1047 const InvokeInst *II = cast<InvokeInst>(&I);
1048 const Value *Callee(II->getCalledValue());
1049 const PointerType *PTy = cast<PointerType>(Callee->getType());
1050 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1051 Code = bitc::FUNC_CODE_INST_INVOKE;
1053 Vals.push_back(VE.getAttributeID(II->getAttributes()));
1054 Vals.push_back(II->getCallingConv());
1055 Vals.push_back(VE.getValueID(II->getNormalDest()));
1056 Vals.push_back(VE.getValueID(II->getUnwindDest()));
1057 PushValueAndType(Callee, InstID, Vals, VE);
1059 // Emit value #'s for the fixed parameters.
1060 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1061 Vals.push_back(VE.getValueID(I.getOperand(i))); // fixed param.
1063 // Emit type/value pairs for varargs params.
1064 if (FTy->isVarArg()) {
1065 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3;
1067 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
1071 case Instruction::Unwind:
1072 Code = bitc::FUNC_CODE_INST_UNWIND;
1074 case Instruction::Unreachable:
1075 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
1076 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
1079 case Instruction::PHI:
1080 Code = bitc::FUNC_CODE_INST_PHI;
1081 Vals.push_back(VE.getTypeID(I.getType()));
1082 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1083 Vals.push_back(VE.getValueID(I.getOperand(i)));
1086 case Instruction::Alloca:
1087 Code = bitc::FUNC_CODE_INST_ALLOCA;
1088 Vals.push_back(VE.getTypeID(I.getType()));
1089 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1090 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1091 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
1094 case Instruction::Load:
1095 Code = bitc::FUNC_CODE_INST_LOAD;
1096 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1097 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1099 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1100 Vals.push_back(cast<LoadInst>(I).isVolatile());
1102 case Instruction::Store:
1103 Code = bitc::FUNC_CODE_INST_STORE2;
1104 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1105 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
1106 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1107 Vals.push_back(cast<StoreInst>(I).isVolatile());
1109 case Instruction::Call: {
1110 const CallInst &CI = cast<CallInst>(I);
1111 const PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
1112 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1114 Code = bitc::FUNC_CODE_INST_CALL2;
1116 Vals.push_back(VE.getAttributeID(CI.getAttributes()));
1117 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()));
1118 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee
1120 // Emit value #'s for the fixed parameters.
1121 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1122 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); // fixed param.
1124 // Emit type/value pairs for varargs params.
1125 if (FTy->isVarArg()) {
1126 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
1128 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs
1132 case Instruction::VAArg:
1133 Code = bitc::FUNC_CODE_INST_VAARG;
1134 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
1135 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
1136 Vals.push_back(VE.getTypeID(I.getType())); // restype.
1140 Stream.EmitRecord(Code, Vals, AbbrevToUse);
1144 // Emit names for globals/functions etc.
1145 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
1146 const ValueEnumerator &VE,
1147 BitstreamWriter &Stream) {
1148 if (VST.empty()) return;
1149 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
1151 // FIXME: Set up the abbrev, we know how many values there are!
1152 // FIXME: We know if the type names can use 7-bit ascii.
1153 SmallVector<unsigned, 64> NameVals;
1155 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
1158 const ValueName &Name = *SI;
1160 // Figure out the encoding to use for the name.
1162 bool isChar6 = true;
1163 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
1166 isChar6 = BitCodeAbbrevOp::isChar6(*C);
1167 if ((unsigned char)*C & 128) {
1169 break; // don't bother scanning the rest.
1173 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
1175 // VST_ENTRY: [valueid, namechar x N]
1176 // VST_BBENTRY: [bbid, namechar x N]
1178 if (isa<BasicBlock>(SI->getValue())) {
1179 Code = bitc::VST_CODE_BBENTRY;
1181 AbbrevToUse = VST_BBENTRY_6_ABBREV;
1183 Code = bitc::VST_CODE_ENTRY;
1185 AbbrevToUse = VST_ENTRY_6_ABBREV;
1187 AbbrevToUse = VST_ENTRY_7_ABBREV;
1190 NameVals.push_back(VE.getValueID(SI->getValue()));
1191 for (const char *P = Name.getKeyData(),
1192 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
1193 NameVals.push_back((unsigned char)*P);
1195 // Emit the finished record.
1196 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
1202 /// WriteFunction - Emit a function body to the module stream.
1203 static void WriteFunction(const Function &F, ValueEnumerator &VE,
1204 BitstreamWriter &Stream) {
1205 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
1206 VE.incorporateFunction(F);
1208 SmallVector<unsigned, 64> Vals;
1210 // Emit the number of basic blocks, so the reader can create them ahead of
1212 Vals.push_back(VE.getBasicBlocks().size());
1213 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
1216 // If there are function-local constants, emit them now.
1217 unsigned CstStart, CstEnd;
1218 VE.getFunctionConstantRange(CstStart, CstEnd);
1219 WriteConstants(CstStart, CstEnd, VE, Stream, false);
1221 // If there is function-local metadata, emit it now.
1222 WriteFunctionLocalMetadata(F, VE, Stream);
1224 // Keep a running idea of what the instruction ID is.
1225 unsigned InstID = CstEnd;
1227 bool NeedsMetadataAttachment = false;
1231 // Finally, emit all the instructions, in order.
1232 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
1233 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
1235 WriteInstruction(*I, InstID, VE, Stream, Vals);
1237 if (!I->getType()->isVoidTy())
1240 // If the instruction has metadata, write a metadata attachment later.
1241 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
1243 // If the instruction has a debug location, emit it.
1244 DebugLoc DL = I->getDebugLoc();
1245 if (DL.isUnknown()) {
1247 } else if (DL == LastDL) {
1248 // Just repeat the same debug loc as last time.
1249 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
1252 DL.getScopeAndInlinedAt(Scope, IA, I->getContext());
1254 Vals.push_back(DL.getLine());
1255 Vals.push_back(DL.getCol());
1256 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0);
1257 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0);
1258 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC2, Vals);
1265 // Emit names for all the instructions etc.
1266 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1268 if (NeedsMetadataAttachment)
1269 WriteMetadataAttachment(F, VE, Stream);
1274 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
1275 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
1276 const ValueEnumerator &VE,
1277 BitstreamWriter &Stream) {
1278 if (TST.empty()) return;
1280 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
1282 // 7-bit fixed width VST_CODE_ENTRY strings.
1283 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1284 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1285 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1286 Log2_32_Ceil(VE.getTypes().size()+1)));
1287 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1288 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1289 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
1291 SmallVector<unsigned, 64> NameVals;
1293 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1295 // TST_ENTRY: [typeid, namechar x N]
1296 NameVals.push_back(VE.getTypeID(TI->second));
1298 const std::string &Str = TI->first;
1300 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1301 NameVals.push_back((unsigned char)Str[i]);
1306 // Emit the finished record.
1307 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1314 // Emit blockinfo, which defines the standard abbreviations etc.
1315 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1316 // We only want to emit block info records for blocks that have multiple
1317 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1318 // blocks can defined their abbrevs inline.
1319 Stream.EnterBlockInfoBlock(2);
1321 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1322 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1323 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1324 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1325 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1326 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1327 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1328 Abbv) != VST_ENTRY_8_ABBREV)
1329 llvm_unreachable("Unexpected abbrev ordering!");
1332 { // 7-bit fixed width VST_ENTRY strings.
1333 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1334 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1335 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1336 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1337 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1338 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1339 Abbv) != VST_ENTRY_7_ABBREV)
1340 llvm_unreachable("Unexpected abbrev ordering!");
1342 { // 6-bit char6 VST_ENTRY strings.
1343 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1344 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1345 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1346 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1347 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1348 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1349 Abbv) != VST_ENTRY_6_ABBREV)
1350 llvm_unreachable("Unexpected abbrev ordering!");
1352 { // 6-bit char6 VST_BBENTRY strings.
1353 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1354 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1355 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1357 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1358 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1359 Abbv) != VST_BBENTRY_6_ABBREV)
1360 llvm_unreachable("Unexpected abbrev ordering!");
1365 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1366 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1367 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1368 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1369 Log2_32_Ceil(VE.getTypes().size()+1)));
1370 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1371 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1372 llvm_unreachable("Unexpected abbrev ordering!");
1375 { // INTEGER abbrev for CONSTANTS_BLOCK.
1376 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1377 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1379 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1380 Abbv) != CONSTANTS_INTEGER_ABBREV)
1381 llvm_unreachable("Unexpected abbrev ordering!");
1384 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1385 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1386 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1387 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1388 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1389 Log2_32_Ceil(VE.getTypes().size()+1)));
1390 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1392 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1393 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1394 llvm_unreachable("Unexpected abbrev ordering!");
1396 { // NULL abbrev for CONSTANTS_BLOCK.
1397 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1398 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1399 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1400 Abbv) != CONSTANTS_NULL_Abbrev)
1401 llvm_unreachable("Unexpected abbrev ordering!");
1404 // FIXME: This should only use space for first class types!
1406 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1407 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1408 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1409 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1410 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1411 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1412 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1413 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1414 llvm_unreachable("Unexpected abbrev ordering!");
1416 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1417 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1418 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1419 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1420 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1421 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1422 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1423 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1424 llvm_unreachable("Unexpected abbrev ordering!");
1426 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1427 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1428 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1429 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1430 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1431 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1432 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1433 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1434 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1435 llvm_unreachable("Unexpected abbrev ordering!");
1437 { // INST_CAST abbrev for FUNCTION_BLOCK.
1438 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1439 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1440 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1441 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1442 Log2_32_Ceil(VE.getTypes().size()+1)));
1443 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1444 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1445 Abbv) != FUNCTION_INST_CAST_ABBREV)
1446 llvm_unreachable("Unexpected abbrev ordering!");
1449 { // INST_RET abbrev for FUNCTION_BLOCK.
1450 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1451 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1452 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1453 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1454 llvm_unreachable("Unexpected abbrev ordering!");
1456 { // INST_RET abbrev for FUNCTION_BLOCK.
1457 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1458 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1459 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1460 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1461 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1462 llvm_unreachable("Unexpected abbrev ordering!");
1464 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1465 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1466 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1467 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1468 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1469 llvm_unreachable("Unexpected abbrev ordering!");
1476 /// WriteModule - Emit the specified module to the bitstream.
1477 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1478 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1480 // Emit the version number if it is non-zero.
1482 SmallVector<unsigned, 1> Vals;
1483 Vals.push_back(CurVersion);
1484 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1487 // Analyze the module, enumerating globals, functions, etc.
1488 ValueEnumerator VE(M);
1490 // Emit blockinfo, which defines the standard abbreviations etc.
1491 WriteBlockInfo(VE, Stream);
1493 // Emit information about parameter attributes.
1494 WriteAttributeTable(VE, Stream);
1496 // Emit information describing all of the types in the module.
1497 WriteTypeTable(VE, Stream);
1499 // Emit top-level description of module, including target triple, inline asm,
1500 // descriptors for global variables, and function prototype info.
1501 WriteModuleInfo(M, VE, Stream);
1504 WriteModuleConstants(VE, Stream);
1507 WriteModuleMetadata(M, VE, Stream);
1509 // Emit function bodies.
1510 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1511 if (!I->isDeclaration())
1512 WriteFunction(*I, VE, Stream);
1515 WriteModuleMetadataStore(M, Stream);
1517 // Emit the type symbol table information.
1518 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1520 // Emit names for globals/functions etc.
1521 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1526 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1527 /// header and trailer to make it compatible with the system archiver. To do
1528 /// this we emit the following header, and then emit a trailer that pads the
1529 /// file out to be a multiple of 16 bytes.
1531 /// struct bc_header {
1532 /// uint32_t Magic; // 0x0B17C0DE
1533 /// uint32_t Version; // Version, currently always 0.
1534 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1535 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1536 /// uint32_t CPUType; // CPU specifier.
1537 /// ... potentially more later ...
1540 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
1541 DarwinBCHeaderSize = 5*4
1544 /// isARMTriplet - Return true if the triplet looks like:
1545 /// arm-*, thumb-*, armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*.
1546 static bool isARMTriplet(const std::string &TT) {
1548 size_t Size = TT.size();
1550 TT[0] == 't' && TT[1] == 'h' && TT[2] == 'u' &&
1551 TT[3] == 'm' && TT[4] == 'b')
1553 else if (Size >= 4 && TT[0] == 'a' && TT[1] == 'r' && TT[2] == 'm')
1560 else if (TT[Pos] == 'v') {
1561 if (Size >= Pos+4 &&
1562 TT[Pos+1] == '6' && TT[Pos+2] == 't' && TT[Pos+3] == '2')
1564 else if (Size >= Pos+4 &&
1565 TT[Pos+1] == '5' && TT[Pos+2] == 't' && TT[Pos+3] == 'e')
1569 while (++Pos < Size && TT[Pos] != '-') {
1570 if (!isdigit(TT[Pos]))
1576 static void EmitDarwinBCHeader(BitstreamWriter &Stream,
1577 const std::string &TT) {
1578 unsigned CPUType = ~0U;
1580 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
1581 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
1582 // number from /usr/include/mach/machine.h. It is ok to reproduce the
1583 // specific constants here because they are implicitly part of the Darwin ABI.
1585 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
1586 DARWIN_CPU_TYPE_X86 = 7,
1587 DARWIN_CPU_TYPE_ARM = 12,
1588 DARWIN_CPU_TYPE_POWERPC = 18
1591 if (TT.find("x86_64-") == 0)
1592 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
1593 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
1594 TT[4] == '-' && TT[1] - '3' < 6)
1595 CPUType = DARWIN_CPU_TYPE_X86;
1596 else if (TT.find("powerpc-") == 0)
1597 CPUType = DARWIN_CPU_TYPE_POWERPC;
1598 else if (TT.find("powerpc64-") == 0)
1599 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
1600 else if (isARMTriplet(TT))
1601 CPUType = DARWIN_CPU_TYPE_ARM;
1603 // Traditional Bitcode starts after header.
1604 unsigned BCOffset = DarwinBCHeaderSize;
1606 Stream.Emit(0x0B17C0DE, 32);
1607 Stream.Emit(0 , 32); // Version.
1608 Stream.Emit(BCOffset , 32);
1609 Stream.Emit(0 , 32); // Filled in later.
1610 Stream.Emit(CPUType , 32);
1613 /// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and
1614 /// finalize the header.
1615 static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) {
1616 // Update the size field in the header.
1617 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize);
1619 // If the file is not a multiple of 16 bytes, insert dummy padding.
1620 while (BufferSize & 15) {
1627 /// WriteBitcodeToFile - Write the specified module to the specified output
1629 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
1630 std::vector<unsigned char> Buffer;
1631 BitstreamWriter Stream(Buffer);
1633 Buffer.reserve(256*1024);
1635 WriteBitcodeToStream( M, Stream );
1637 // Write the generated bitstream to "Out".
1638 Out.write((char*)&Buffer.front(), Buffer.size());
1641 /// WriteBitcodeToStream - Write the specified module to the specified output
1643 void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) {
1644 // If this is darwin, emit a file header and trailer if needed.
1645 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos;
1647 EmitDarwinBCHeader(Stream, M->getTargetTriple());
1649 // Emit the file header.
1650 Stream.Emit((unsigned)'B', 8);
1651 Stream.Emit((unsigned)'C', 8);
1652 Stream.Emit(0x0, 4);
1653 Stream.Emit(0xC, 4);
1654 Stream.Emit(0xE, 4);
1655 Stream.Emit(0xD, 4);
1658 WriteModule(M, Stream);
1661 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());