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/Support/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::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break;
215 case Type::IntegerTyID:
217 Code = bitc::TYPE_CODE_INTEGER;
218 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
220 case Type::PointerTyID: {
221 const PointerType *PTy = cast<PointerType>(T);
222 // POINTER: [pointee type, address space]
223 Code = bitc::TYPE_CODE_POINTER;
224 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
225 unsigned AddressSpace = PTy->getAddressSpace();
226 TypeVals.push_back(AddressSpace);
227 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
230 case Type::FunctionTyID: {
231 const FunctionType *FT = cast<FunctionType>(T);
232 // FUNCTION: [isvararg, attrid, retty, paramty x N]
233 Code = bitc::TYPE_CODE_FUNCTION;
234 TypeVals.push_back(FT->isVarArg());
235 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0
236 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
237 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
238 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
239 AbbrevToUse = FunctionAbbrev;
242 case Type::StructTyID: {
243 const StructType *ST = cast<StructType>(T);
244 // STRUCT: [ispacked, eltty x N]
245 Code = bitc::TYPE_CODE_STRUCT;
246 TypeVals.push_back(ST->isPacked());
247 // Output all of the element types.
248 for (StructType::element_iterator I = ST->element_begin(),
249 E = ST->element_end(); I != E; ++I)
250 TypeVals.push_back(VE.getTypeID(*I));
251 AbbrevToUse = StructAbbrev;
254 case Type::ArrayTyID: {
255 const ArrayType *AT = cast<ArrayType>(T);
256 // ARRAY: [numelts, eltty]
257 Code = bitc::TYPE_CODE_ARRAY;
258 TypeVals.push_back(AT->getNumElements());
259 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
260 AbbrevToUse = ArrayAbbrev;
263 case Type::VectorTyID: {
264 const VectorType *VT = cast<VectorType>(T);
265 // VECTOR [numelts, eltty]
266 Code = bitc::TYPE_CODE_VECTOR;
267 TypeVals.push_back(VT->getNumElements());
268 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
273 // Emit the finished record.
274 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
281 static unsigned getEncodedLinkage(const GlobalValue *GV) {
282 switch (GV->getLinkage()) {
283 default: llvm_unreachable("Invalid linkage!");
284 case GlobalValue::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;
298 case GlobalValue::LinkerPrivateWeakLinkage: return 14;
299 case GlobalValue::LinkerPrivateWeakDefAutoLinkage: return 15;
303 static unsigned getEncodedVisibility(const GlobalValue *GV) {
304 switch (GV->getVisibility()) {
305 default: llvm_unreachable("Invalid visibility!");
306 case GlobalValue::DefaultVisibility: return 0;
307 case GlobalValue::HiddenVisibility: return 1;
308 case GlobalValue::ProtectedVisibility: return 2;
312 // Emit top-level description of module, including target triple, inline asm,
313 // descriptors for global variables, and function prototype info.
314 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
315 BitstreamWriter &Stream) {
316 // Emit the list of dependent libraries for the Module.
317 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
318 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
320 // Emit various pieces of data attached to a module.
321 if (!M->getTargetTriple().empty())
322 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
324 if (!M->getDataLayout().empty())
325 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
327 if (!M->getModuleInlineAsm().empty())
328 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
331 // Emit information about sections and GC, computing how many there are. Also
332 // compute the maximum alignment value.
333 std::map<std::string, unsigned> SectionMap;
334 std::map<std::string, unsigned> GCMap;
335 unsigned MaxAlignment = 0;
336 unsigned MaxGlobalType = 0;
337 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
339 MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
340 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
342 if (!GV->hasSection()) continue;
343 // Give section names unique ID's.
344 unsigned &Entry = SectionMap[GV->getSection()];
345 if (Entry != 0) continue;
346 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
348 Entry = SectionMap.size();
350 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
351 MaxAlignment = std::max(MaxAlignment, F->getAlignment());
352 if (F->hasSection()) {
353 // Give section names unique ID's.
354 unsigned &Entry = SectionMap[F->getSection()];
356 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
358 Entry = SectionMap.size();
362 // Same for GC names.
363 unsigned &Entry = GCMap[F->getGC()];
365 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(),
367 Entry = GCMap.size();
372 // Emit abbrev for globals, now that we know # sections and max alignment.
373 unsigned SimpleGVarAbbrev = 0;
374 if (!M->global_empty()) {
375 // Add an abbrev for common globals with no visibility or thread localness.
376 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
377 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
379 Log2_32_Ceil(MaxGlobalType+1)));
380 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
381 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
382 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage.
383 if (MaxAlignment == 0) // Alignment.
384 Abbv->Add(BitCodeAbbrevOp(0));
386 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
387 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
388 Log2_32_Ceil(MaxEncAlignment+1)));
390 if (SectionMap.empty()) // Section.
391 Abbv->Add(BitCodeAbbrevOp(0));
393 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
394 Log2_32_Ceil(SectionMap.size()+1)));
395 // Don't bother emitting vis + thread local.
396 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
399 // Emit the global variable information.
400 SmallVector<unsigned, 64> Vals;
401 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
403 unsigned AbbrevToUse = 0;
405 // GLOBALVAR: [type, isconst, initid,
406 // linkage, alignment, section, visibility, threadlocal]
407 Vals.push_back(VE.getTypeID(GV->getType()));
408 Vals.push_back(GV->isConstant());
409 Vals.push_back(GV->isDeclaration() ? 0 :
410 (VE.getValueID(GV->getInitializer()) + 1));
411 Vals.push_back(getEncodedLinkage(GV));
412 Vals.push_back(Log2_32(GV->getAlignment())+1);
413 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
414 if (GV->isThreadLocal() ||
415 GV->getVisibility() != GlobalValue::DefaultVisibility) {
416 Vals.push_back(getEncodedVisibility(GV));
417 Vals.push_back(GV->isThreadLocal());
419 AbbrevToUse = SimpleGVarAbbrev;
422 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
426 // Emit the function proto information.
427 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
428 // FUNCTION: [type, callingconv, isproto, paramattr,
429 // linkage, alignment, section, visibility, gc]
430 Vals.push_back(VE.getTypeID(F->getType()));
431 Vals.push_back(F->getCallingConv());
432 Vals.push_back(F->isDeclaration());
433 Vals.push_back(getEncodedLinkage(F));
434 Vals.push_back(VE.getAttributeID(F->getAttributes()));
435 Vals.push_back(Log2_32(F->getAlignment())+1);
436 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
437 Vals.push_back(getEncodedVisibility(F));
438 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0);
440 unsigned AbbrevToUse = 0;
441 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
446 // Emit the alias information.
447 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
449 Vals.push_back(VE.getTypeID(AI->getType()));
450 Vals.push_back(VE.getValueID(AI->getAliasee()));
451 Vals.push_back(getEncodedLinkage(AI));
452 Vals.push_back(getEncodedVisibility(AI));
453 unsigned AbbrevToUse = 0;
454 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
459 static uint64_t GetOptimizationFlags(const Value *V) {
462 if (const OverflowingBinaryOperator *OBO =
463 dyn_cast<OverflowingBinaryOperator>(V)) {
464 if (OBO->hasNoSignedWrap())
465 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
466 if (OBO->hasNoUnsignedWrap())
467 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
468 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) {
470 Flags |= 1 << bitc::SDIV_EXACT;
476 static void WriteMDNode(const MDNode *N,
477 const ValueEnumerator &VE,
478 BitstreamWriter &Stream,
479 SmallVector<uint64_t, 64> &Record) {
480 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
481 if (N->getOperand(i)) {
482 Record.push_back(VE.getTypeID(N->getOperand(i)->getType()));
483 Record.push_back(VE.getValueID(N->getOperand(i)));
485 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
489 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE2 :
490 bitc::METADATA_NODE2;
491 Stream.EmitRecord(MDCode, Record, 0);
495 static void WriteModuleMetadata(const Module *M,
496 const ValueEnumerator &VE,
497 BitstreamWriter &Stream) {
498 const ValueEnumerator::ValueList &Vals = VE.getMDValues();
499 bool StartedMetadataBlock = false;
500 unsigned MDSAbbrev = 0;
501 SmallVector<uint64_t, 64> Record;
502 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
504 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
505 if (!N->isFunctionLocal() || !N->getFunction()) {
506 if (!StartedMetadataBlock) {
507 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
508 StartedMetadataBlock = true;
510 WriteMDNode(N, VE, Stream, Record);
512 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
513 if (!StartedMetadataBlock) {
514 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
516 // Abbrev for METADATA_STRING.
517 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
518 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
519 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
520 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
521 MDSAbbrev = Stream.EmitAbbrev(Abbv);
522 StartedMetadataBlock = true;
525 // Code: [strchar x N]
526 Record.append(MDS->begin(), MDS->end());
528 // Emit the finished record.
529 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
534 // Write named metadata.
535 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
536 E = M->named_metadata_end(); I != E; ++I) {
537 const NamedMDNode *NMD = I;
538 if (!StartedMetadataBlock) {
539 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
540 StartedMetadataBlock = true;
544 StringRef Str = NMD->getName();
545 for (unsigned i = 0, e = Str.size(); i != e; ++i)
546 Record.push_back(Str[i]);
547 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
550 // Write named metadata operands.
551 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
552 Record.push_back(VE.getValueID(NMD->getOperand(i)));
553 Stream.EmitRecord(bitc::METADATA_NAMED_NODE2, Record, 0);
557 if (StartedMetadataBlock)
561 static void WriteFunctionLocalMetadata(const Function &F,
562 const ValueEnumerator &VE,
563 BitstreamWriter &Stream) {
564 bool StartedMetadataBlock = false;
565 SmallVector<uint64_t, 64> Record;
566 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues();
567 for (unsigned i = 0, e = Vals.size(); i != e; ++i)
568 if (const MDNode *N = Vals[i])
569 if (N->isFunctionLocal() && N->getFunction() == &F) {
570 if (!StartedMetadataBlock) {
571 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
572 StartedMetadataBlock = true;
574 WriteMDNode(N, VE, Stream, Record);
577 if (StartedMetadataBlock)
581 static void WriteMetadataAttachment(const Function &F,
582 const ValueEnumerator &VE,
583 BitstreamWriter &Stream) {
584 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
586 SmallVector<uint64_t, 64> Record;
588 // Write metadata attachments
589 // METADATA_ATTACHMENT2 - [m x [value, [n x [id, mdnode]]]
590 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
592 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
593 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
596 I->getAllMetadataOtherThanDebugLoc(MDs);
598 // If no metadata, ignore instruction.
599 if (MDs.empty()) continue;
601 Record.push_back(VE.getInstructionID(I));
603 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
604 Record.push_back(MDs[i].first);
605 Record.push_back(VE.getValueID(MDs[i].second));
607 Stream.EmitRecord(bitc::METADATA_ATTACHMENT2, Record, 0);
614 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
615 SmallVector<uint64_t, 64> Record;
617 // Write metadata kinds
618 // METADATA_KIND - [n x [id, name]]
619 SmallVector<StringRef, 4> Names;
620 M->getMDKindNames(Names);
622 if (Names.empty()) return;
624 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
626 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
627 Record.push_back(MDKindID);
628 StringRef KName = Names[MDKindID];
629 Record.append(KName.begin(), KName.end());
631 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
638 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
639 const ValueEnumerator &VE,
640 BitstreamWriter &Stream, bool isGlobal) {
641 if (FirstVal == LastVal) return;
643 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
645 unsigned AggregateAbbrev = 0;
646 unsigned String8Abbrev = 0;
647 unsigned CString7Abbrev = 0;
648 unsigned CString6Abbrev = 0;
649 // If this is a constant pool for the module, emit module-specific abbrevs.
651 // Abbrev for CST_CODE_AGGREGATE.
652 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
653 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
654 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
655 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
656 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
658 // Abbrev for CST_CODE_STRING.
659 Abbv = new BitCodeAbbrev();
660 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
661 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
662 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
663 String8Abbrev = Stream.EmitAbbrev(Abbv);
664 // Abbrev for CST_CODE_CSTRING.
665 Abbv = new BitCodeAbbrev();
666 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
667 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
668 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
669 CString7Abbrev = Stream.EmitAbbrev(Abbv);
670 // Abbrev for CST_CODE_CSTRING.
671 Abbv = new BitCodeAbbrev();
672 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
673 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
674 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
675 CString6Abbrev = Stream.EmitAbbrev(Abbv);
678 SmallVector<uint64_t, 64> Record;
680 const ValueEnumerator::ValueList &Vals = VE.getValues();
681 const Type *LastTy = 0;
682 for (unsigned i = FirstVal; i != LastVal; ++i) {
683 const Value *V = Vals[i].first;
684 // If we need to switch types, do so now.
685 if (V->getType() != LastTy) {
686 LastTy = V->getType();
687 Record.push_back(VE.getTypeID(LastTy));
688 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
689 CONSTANTS_SETTYPE_ABBREV);
693 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
694 Record.push_back(unsigned(IA->hasSideEffects()) |
695 unsigned(IA->isAlignStack()) << 1);
697 // Add the asm string.
698 const std::string &AsmStr = IA->getAsmString();
699 Record.push_back(AsmStr.size());
700 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
701 Record.push_back(AsmStr[i]);
703 // Add the constraint string.
704 const std::string &ConstraintStr = IA->getConstraintString();
705 Record.push_back(ConstraintStr.size());
706 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
707 Record.push_back(ConstraintStr[i]);
708 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
712 const Constant *C = cast<Constant>(V);
714 unsigned AbbrevToUse = 0;
715 if (C->isNullValue()) {
716 Code = bitc::CST_CODE_NULL;
717 } else if (isa<UndefValue>(C)) {
718 Code = bitc::CST_CODE_UNDEF;
719 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
720 if (IV->getBitWidth() <= 64) {
721 uint64_t V = IV->getSExtValue();
723 Record.push_back(V << 1);
725 Record.push_back((-V << 1) | 1);
726 Code = bitc::CST_CODE_INTEGER;
727 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
728 } else { // Wide integers, > 64 bits in size.
729 // We have an arbitrary precision integer value to write whose
730 // bit width is > 64. However, in canonical unsigned integer
731 // format it is likely that the high bits are going to be zero.
732 // So, we only write the number of active words.
733 unsigned NWords = IV->getValue().getActiveWords();
734 const uint64_t *RawWords = IV->getValue().getRawData();
735 for (unsigned i = 0; i != NWords; ++i) {
736 int64_t V = RawWords[i];
738 Record.push_back(V << 1);
740 Record.push_back((-V << 1) | 1);
742 Code = bitc::CST_CODE_WIDE_INTEGER;
744 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
745 Code = bitc::CST_CODE_FLOAT;
746 const Type *Ty = CFP->getType();
747 if (Ty->isFloatTy() || Ty->isDoubleTy()) {
748 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
749 } else if (Ty->isX86_FP80Ty()) {
750 // api needed to prevent premature destruction
751 // bits are not in the same order as a normal i80 APInt, compensate.
752 APInt api = CFP->getValueAPF().bitcastToAPInt();
753 const uint64_t *p = api.getRawData();
754 Record.push_back((p[1] << 48) | (p[0] >> 16));
755 Record.push_back(p[0] & 0xffffLL);
756 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
757 APInt api = CFP->getValueAPF().bitcastToAPInt();
758 const uint64_t *p = api.getRawData();
759 Record.push_back(p[0]);
760 Record.push_back(p[1]);
762 assert (0 && "Unknown FP type!");
764 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
765 const ConstantArray *CA = cast<ConstantArray>(C);
766 // Emit constant strings specially.
767 unsigned NumOps = CA->getNumOperands();
768 // If this is a null-terminated string, use the denser CSTRING encoding.
769 if (CA->getOperand(NumOps-1)->isNullValue()) {
770 Code = bitc::CST_CODE_CSTRING;
771 --NumOps; // Don't encode the null, which isn't allowed by char6.
773 Code = bitc::CST_CODE_STRING;
774 AbbrevToUse = String8Abbrev;
776 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
777 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
778 for (unsigned i = 0; i != NumOps; ++i) {
779 unsigned char V = cast<ConstantInt>(CA->getOperand(i))->getZExtValue();
781 isCStr7 &= (V & 128) == 0;
783 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
787 AbbrevToUse = CString6Abbrev;
789 AbbrevToUse = CString7Abbrev;
790 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
791 isa<ConstantVector>(V)) {
792 Code = bitc::CST_CODE_AGGREGATE;
793 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
794 Record.push_back(VE.getValueID(C->getOperand(i)));
795 AbbrevToUse = AggregateAbbrev;
796 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
797 switch (CE->getOpcode()) {
799 if (Instruction::isCast(CE->getOpcode())) {
800 Code = bitc::CST_CODE_CE_CAST;
801 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
802 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
803 Record.push_back(VE.getValueID(C->getOperand(0)));
804 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
806 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
807 Code = bitc::CST_CODE_CE_BINOP;
808 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
809 Record.push_back(VE.getValueID(C->getOperand(0)));
810 Record.push_back(VE.getValueID(C->getOperand(1)));
811 uint64_t Flags = GetOptimizationFlags(CE);
813 Record.push_back(Flags);
816 case Instruction::GetElementPtr:
817 Code = bitc::CST_CODE_CE_GEP;
818 if (cast<GEPOperator>(C)->isInBounds())
819 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
820 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
821 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
822 Record.push_back(VE.getValueID(C->getOperand(i)));
825 case Instruction::Select:
826 Code = bitc::CST_CODE_CE_SELECT;
827 Record.push_back(VE.getValueID(C->getOperand(0)));
828 Record.push_back(VE.getValueID(C->getOperand(1)));
829 Record.push_back(VE.getValueID(C->getOperand(2)));
831 case Instruction::ExtractElement:
832 Code = bitc::CST_CODE_CE_EXTRACTELT;
833 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
834 Record.push_back(VE.getValueID(C->getOperand(0)));
835 Record.push_back(VE.getValueID(C->getOperand(1)));
837 case Instruction::InsertElement:
838 Code = bitc::CST_CODE_CE_INSERTELT;
839 Record.push_back(VE.getValueID(C->getOperand(0)));
840 Record.push_back(VE.getValueID(C->getOperand(1)));
841 Record.push_back(VE.getValueID(C->getOperand(2)));
843 case Instruction::ShuffleVector:
844 // If the return type and argument types are the same, this is a
845 // standard shufflevector instruction. If the types are different,
846 // then the shuffle is widening or truncating the input vectors, and
847 // the argument type must also be encoded.
848 if (C->getType() == C->getOperand(0)->getType()) {
849 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
851 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
852 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
854 Record.push_back(VE.getValueID(C->getOperand(0)));
855 Record.push_back(VE.getValueID(C->getOperand(1)));
856 Record.push_back(VE.getValueID(C->getOperand(2)));
858 case Instruction::ICmp:
859 case Instruction::FCmp:
860 Code = bitc::CST_CODE_CE_CMP;
861 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
862 Record.push_back(VE.getValueID(C->getOperand(0)));
863 Record.push_back(VE.getValueID(C->getOperand(1)));
864 Record.push_back(CE->getPredicate());
867 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
868 assert(BA->getFunction() == BA->getBasicBlock()->getParent() &&
869 "Malformed blockaddress");
870 Code = bitc::CST_CODE_BLOCKADDRESS;
871 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
872 Record.push_back(VE.getValueID(BA->getFunction()));
873 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
878 llvm_unreachable("Unknown constant!");
880 Stream.EmitRecord(Code, Record, AbbrevToUse);
887 static void WriteModuleConstants(const ValueEnumerator &VE,
888 BitstreamWriter &Stream) {
889 const ValueEnumerator::ValueList &Vals = VE.getValues();
891 // Find the first constant to emit, which is the first non-globalvalue value.
892 // We know globalvalues have been emitted by WriteModuleInfo.
893 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
894 if (!isa<GlobalValue>(Vals[i].first)) {
895 WriteConstants(i, Vals.size(), VE, Stream, true);
901 /// PushValueAndType - The file has to encode both the value and type id for
902 /// many values, because we need to know what type to create for forward
903 /// references. However, most operands are not forward references, so this type
904 /// field is not needed.
906 /// This function adds V's value ID to Vals. If the value ID is higher than the
907 /// instruction ID, then it is a forward reference, and it also includes the
909 static bool PushValueAndType(const Value *V, unsigned InstID,
910 SmallVector<unsigned, 64> &Vals,
911 ValueEnumerator &VE) {
912 unsigned ValID = VE.getValueID(V);
913 Vals.push_back(ValID);
914 if (ValID >= InstID) {
915 Vals.push_back(VE.getTypeID(V->getType()));
921 /// WriteInstruction - Emit an instruction to the specified stream.
922 static void WriteInstruction(const Instruction &I, unsigned InstID,
923 ValueEnumerator &VE, BitstreamWriter &Stream,
924 SmallVector<unsigned, 64> &Vals) {
926 unsigned AbbrevToUse = 0;
927 VE.setInstructionID(&I);
928 switch (I.getOpcode()) {
930 if (Instruction::isCast(I.getOpcode())) {
931 Code = bitc::FUNC_CODE_INST_CAST;
932 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
933 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
934 Vals.push_back(VE.getTypeID(I.getType()));
935 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
937 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
938 Code = bitc::FUNC_CODE_INST_BINOP;
939 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
940 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
941 Vals.push_back(VE.getValueID(I.getOperand(1)));
942 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
943 uint64_t Flags = GetOptimizationFlags(&I);
945 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
946 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
947 Vals.push_back(Flags);
952 case Instruction::GetElementPtr:
953 Code = bitc::FUNC_CODE_INST_GEP;
954 if (cast<GEPOperator>(&I)->isInBounds())
955 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP;
956 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
957 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
959 case Instruction::ExtractValue: {
960 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
961 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
962 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
963 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
967 case Instruction::InsertValue: {
968 Code = bitc::FUNC_CODE_INST_INSERTVAL;
969 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
970 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
971 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
972 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
976 case Instruction::Select:
977 Code = bitc::FUNC_CODE_INST_VSELECT;
978 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
979 Vals.push_back(VE.getValueID(I.getOperand(2)));
980 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
982 case Instruction::ExtractElement:
983 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
984 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
985 Vals.push_back(VE.getValueID(I.getOperand(1)));
987 case Instruction::InsertElement:
988 Code = bitc::FUNC_CODE_INST_INSERTELT;
989 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
990 Vals.push_back(VE.getValueID(I.getOperand(1)));
991 Vals.push_back(VE.getValueID(I.getOperand(2)));
993 case Instruction::ShuffleVector:
994 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
995 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
996 Vals.push_back(VE.getValueID(I.getOperand(1)));
997 Vals.push_back(VE.getValueID(I.getOperand(2)));
999 case Instruction::ICmp:
1000 case Instruction::FCmp:
1001 // compare returning Int1Ty or vector of Int1Ty
1002 Code = bitc::FUNC_CODE_INST_CMP2;
1003 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1004 Vals.push_back(VE.getValueID(I.getOperand(1)));
1005 Vals.push_back(cast<CmpInst>(I).getPredicate());
1008 case Instruction::Ret:
1010 Code = bitc::FUNC_CODE_INST_RET;
1011 unsigned NumOperands = I.getNumOperands();
1012 if (NumOperands == 0)
1013 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
1014 else if (NumOperands == 1) {
1015 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1016 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
1018 for (unsigned i = 0, e = NumOperands; i != e; ++i)
1019 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1023 case Instruction::Br:
1025 Code = bitc::FUNC_CODE_INST_BR;
1026 BranchInst &II = cast<BranchInst>(I);
1027 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
1028 if (II.isConditional()) {
1029 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
1030 Vals.push_back(VE.getValueID(II.getCondition()));
1034 case Instruction::Switch:
1035 Code = bitc::FUNC_CODE_INST_SWITCH;
1036 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1037 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1038 Vals.push_back(VE.getValueID(I.getOperand(i)));
1040 case Instruction::IndirectBr:
1041 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
1042 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1043 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1044 Vals.push_back(VE.getValueID(I.getOperand(i)));
1047 case Instruction::Invoke: {
1048 const InvokeInst *II = cast<InvokeInst>(&I);
1049 const Value *Callee(II->getCalledValue());
1050 const PointerType *PTy = cast<PointerType>(Callee->getType());
1051 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1052 Code = bitc::FUNC_CODE_INST_INVOKE;
1054 Vals.push_back(VE.getAttributeID(II->getAttributes()));
1055 Vals.push_back(II->getCallingConv());
1056 Vals.push_back(VE.getValueID(II->getNormalDest()));
1057 Vals.push_back(VE.getValueID(II->getUnwindDest()));
1058 PushValueAndType(Callee, InstID, Vals, VE);
1060 // Emit value #'s for the fixed parameters.
1061 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1062 Vals.push_back(VE.getValueID(I.getOperand(i))); // fixed param.
1064 // Emit type/value pairs for varargs params.
1065 if (FTy->isVarArg()) {
1066 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3;
1068 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
1072 case Instruction::Unwind:
1073 Code = bitc::FUNC_CODE_INST_UNWIND;
1075 case Instruction::Unreachable:
1076 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
1077 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
1080 case Instruction::PHI:
1081 Code = bitc::FUNC_CODE_INST_PHI;
1082 Vals.push_back(VE.getTypeID(I.getType()));
1083 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1084 Vals.push_back(VE.getValueID(I.getOperand(i)));
1087 case Instruction::Alloca:
1088 Code = bitc::FUNC_CODE_INST_ALLOCA;
1089 Vals.push_back(VE.getTypeID(I.getType()));
1090 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1091 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1092 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
1095 case Instruction::Load:
1096 Code = bitc::FUNC_CODE_INST_LOAD;
1097 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1098 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1100 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1101 Vals.push_back(cast<LoadInst>(I).isVolatile());
1103 case Instruction::Store:
1104 Code = bitc::FUNC_CODE_INST_STORE2;
1105 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1106 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
1107 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1108 Vals.push_back(cast<StoreInst>(I).isVolatile());
1110 case Instruction::Call: {
1111 const CallInst &CI = cast<CallInst>(I);
1112 const PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
1113 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1115 Code = bitc::FUNC_CODE_INST_CALL2;
1117 Vals.push_back(VE.getAttributeID(CI.getAttributes()));
1118 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()));
1119 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee
1121 // Emit value #'s for the fixed parameters.
1122 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1123 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); // fixed param.
1125 // Emit type/value pairs for varargs params.
1126 if (FTy->isVarArg()) {
1127 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
1129 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs
1133 case Instruction::VAArg:
1134 Code = bitc::FUNC_CODE_INST_VAARG;
1135 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
1136 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
1137 Vals.push_back(VE.getTypeID(I.getType())); // restype.
1141 Stream.EmitRecord(Code, Vals, AbbrevToUse);
1145 // Emit names for globals/functions etc.
1146 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
1147 const ValueEnumerator &VE,
1148 BitstreamWriter &Stream) {
1149 if (VST.empty()) return;
1150 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
1152 // FIXME: Set up the abbrev, we know how many values there are!
1153 // FIXME: We know if the type names can use 7-bit ascii.
1154 SmallVector<unsigned, 64> NameVals;
1156 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
1159 const ValueName &Name = *SI;
1161 // Figure out the encoding to use for the name.
1163 bool isChar6 = true;
1164 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
1167 isChar6 = BitCodeAbbrevOp::isChar6(*C);
1168 if ((unsigned char)*C & 128) {
1170 break; // don't bother scanning the rest.
1174 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
1176 // VST_ENTRY: [valueid, namechar x N]
1177 // VST_BBENTRY: [bbid, namechar x N]
1179 if (isa<BasicBlock>(SI->getValue())) {
1180 Code = bitc::VST_CODE_BBENTRY;
1182 AbbrevToUse = VST_BBENTRY_6_ABBREV;
1184 Code = bitc::VST_CODE_ENTRY;
1186 AbbrevToUse = VST_ENTRY_6_ABBREV;
1188 AbbrevToUse = VST_ENTRY_7_ABBREV;
1191 NameVals.push_back(VE.getValueID(SI->getValue()));
1192 for (const char *P = Name.getKeyData(),
1193 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
1194 NameVals.push_back((unsigned char)*P);
1196 // Emit the finished record.
1197 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
1203 /// WriteFunction - Emit a function body to the module stream.
1204 static void WriteFunction(const Function &F, ValueEnumerator &VE,
1205 BitstreamWriter &Stream) {
1206 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
1207 VE.incorporateFunction(F);
1209 SmallVector<unsigned, 64> Vals;
1211 // Emit the number of basic blocks, so the reader can create them ahead of
1213 Vals.push_back(VE.getBasicBlocks().size());
1214 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
1217 // If there are function-local constants, emit them now.
1218 unsigned CstStart, CstEnd;
1219 VE.getFunctionConstantRange(CstStart, CstEnd);
1220 WriteConstants(CstStart, CstEnd, VE, Stream, false);
1222 // If there is function-local metadata, emit it now.
1223 WriteFunctionLocalMetadata(F, VE, Stream);
1225 // Keep a running idea of what the instruction ID is.
1226 unsigned InstID = CstEnd;
1228 bool NeedsMetadataAttachment = false;
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);
1238 if (!I->getType()->isVoidTy())
1241 // If the instruction has metadata, write a metadata attachment later.
1242 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
1244 // If the instruction has a debug location, emit it.
1245 DebugLoc DL = I->getDebugLoc();
1246 if (DL.isUnknown()) {
1248 } else if (DL == LastDL) {
1249 // Just repeat the same debug loc as last time.
1250 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
1253 DL.getScopeAndInlinedAt(Scope, IA, I->getContext());
1255 Vals.push_back(DL.getLine());
1256 Vals.push_back(DL.getCol());
1257 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0);
1258 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0);
1259 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC2, Vals);
1266 // Emit names for all the instructions etc.
1267 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1269 if (NeedsMetadataAttachment)
1270 WriteMetadataAttachment(F, VE, Stream);
1275 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
1276 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
1277 const ValueEnumerator &VE,
1278 BitstreamWriter &Stream) {
1279 if (TST.empty()) return;
1281 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
1283 // 7-bit fixed width VST_CODE_ENTRY strings.
1284 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1285 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1286 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1287 Log2_32_Ceil(VE.getTypes().size()+1)));
1288 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1289 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1290 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
1292 SmallVector<unsigned, 64> NameVals;
1294 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1296 // TST_ENTRY: [typeid, namechar x N]
1297 NameVals.push_back(VE.getTypeID(TI->second));
1299 const std::string &Str = TI->first;
1301 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1302 NameVals.push_back((unsigned char)Str[i]);
1307 // Emit the finished record.
1308 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1315 // Emit blockinfo, which defines the standard abbreviations etc.
1316 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1317 // We only want to emit block info records for blocks that have multiple
1318 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1319 // blocks can defined their abbrevs inline.
1320 Stream.EnterBlockInfoBlock(2);
1322 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1323 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1324 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1325 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1326 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1327 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1328 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1329 Abbv) != VST_ENTRY_8_ABBREV)
1330 llvm_unreachable("Unexpected abbrev ordering!");
1333 { // 7-bit fixed width VST_ENTRY strings.
1334 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1335 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1336 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1337 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1338 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1339 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1340 Abbv) != VST_ENTRY_7_ABBREV)
1341 llvm_unreachable("Unexpected abbrev ordering!");
1343 { // 6-bit char6 VST_ENTRY strings.
1344 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1345 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1346 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1347 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1348 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1349 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1350 Abbv) != VST_ENTRY_6_ABBREV)
1351 llvm_unreachable("Unexpected abbrev ordering!");
1353 { // 6-bit char6 VST_BBENTRY strings.
1354 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1355 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1357 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1358 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1359 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1360 Abbv) != VST_BBENTRY_6_ABBREV)
1361 llvm_unreachable("Unexpected abbrev ordering!");
1366 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1367 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1368 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1369 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1370 Log2_32_Ceil(VE.getTypes().size()+1)));
1371 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1372 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1373 llvm_unreachable("Unexpected abbrev ordering!");
1376 { // INTEGER abbrev for CONSTANTS_BLOCK.
1377 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1378 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1379 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1380 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1381 Abbv) != CONSTANTS_INTEGER_ABBREV)
1382 llvm_unreachable("Unexpected abbrev ordering!");
1385 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1386 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1387 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1388 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1389 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1390 Log2_32_Ceil(VE.getTypes().size()+1)));
1391 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1393 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1394 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1395 llvm_unreachable("Unexpected abbrev ordering!");
1397 { // NULL abbrev for CONSTANTS_BLOCK.
1398 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1399 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1400 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1401 Abbv) != CONSTANTS_NULL_Abbrev)
1402 llvm_unreachable("Unexpected abbrev ordering!");
1405 // FIXME: This should only use space for first class types!
1407 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1408 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1409 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1410 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1411 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1412 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1413 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1414 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1415 llvm_unreachable("Unexpected abbrev ordering!");
1417 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1418 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1419 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1420 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1421 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1422 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1423 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1424 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1425 llvm_unreachable("Unexpected abbrev ordering!");
1427 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1428 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1429 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1430 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1431 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1432 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1433 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1434 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1435 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1436 llvm_unreachable("Unexpected abbrev ordering!");
1438 { // INST_CAST abbrev for FUNCTION_BLOCK.
1439 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1440 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1441 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1442 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1443 Log2_32_Ceil(VE.getTypes().size()+1)));
1444 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1445 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1446 Abbv) != FUNCTION_INST_CAST_ABBREV)
1447 llvm_unreachable("Unexpected abbrev ordering!");
1450 { // INST_RET abbrev for FUNCTION_BLOCK.
1451 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1452 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1453 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1454 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1455 llvm_unreachable("Unexpected abbrev ordering!");
1457 { // INST_RET abbrev for FUNCTION_BLOCK.
1458 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1459 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1460 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1461 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1462 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1463 llvm_unreachable("Unexpected abbrev ordering!");
1465 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1466 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1467 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1468 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1469 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1470 llvm_unreachable("Unexpected abbrev ordering!");
1477 /// WriteModule - Emit the specified module to the bitstream.
1478 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1479 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1481 // Emit the version number if it is non-zero.
1483 SmallVector<unsigned, 1> Vals;
1484 Vals.push_back(CurVersion);
1485 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1488 // Analyze the module, enumerating globals, functions, etc.
1489 ValueEnumerator VE(M);
1491 // Emit blockinfo, which defines the standard abbreviations etc.
1492 WriteBlockInfo(VE, Stream);
1494 // Emit information about parameter attributes.
1495 WriteAttributeTable(VE, Stream);
1497 // Emit information describing all of the types in the module.
1498 WriteTypeTable(VE, Stream);
1500 // Emit top-level description of module, including target triple, inline asm,
1501 // descriptors for global variables, and function prototype info.
1502 WriteModuleInfo(M, VE, Stream);
1505 WriteModuleConstants(VE, Stream);
1508 WriteModuleMetadata(M, VE, Stream);
1510 // Emit function bodies.
1511 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1512 if (!I->isDeclaration())
1513 WriteFunction(*I, VE, Stream);
1516 WriteModuleMetadataStore(M, Stream);
1518 // Emit the type symbol table information.
1519 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1521 // Emit names for globals/functions etc.
1522 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1527 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1528 /// header and trailer to make it compatible with the system archiver. To do
1529 /// this we emit the following header, and then emit a trailer that pads the
1530 /// file out to be a multiple of 16 bytes.
1532 /// struct bc_header {
1533 /// uint32_t Magic; // 0x0B17C0DE
1534 /// uint32_t Version; // Version, currently always 0.
1535 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1536 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1537 /// uint32_t CPUType; // CPU specifier.
1538 /// ... potentially more later ...
1541 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
1542 DarwinBCHeaderSize = 5*4
1545 /// isARMTriplet - Return true if the triplet looks like:
1546 /// arm-*, thumb-*, armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*.
1547 static bool isARMTriplet(const std::string &TT) {
1549 size_t Size = TT.size();
1551 TT[0] == 't' && TT[1] == 'h' && TT[2] == 'u' &&
1552 TT[3] == 'm' && TT[4] == 'b')
1554 else if (Size >= 4 && TT[0] == 'a' && TT[1] == 'r' && TT[2] == 'm')
1561 else if (TT[Pos] == 'v') {
1562 if (Size >= Pos+4 &&
1563 TT[Pos+1] == '6' && TT[Pos+2] == 't' && TT[Pos+3] == '2')
1565 else if (Size >= Pos+4 &&
1566 TT[Pos+1] == '5' && TT[Pos+2] == 't' && TT[Pos+3] == 'e')
1570 while (++Pos < Size && TT[Pos] != '-') {
1571 if (!isdigit(TT[Pos]))
1577 static void EmitDarwinBCHeader(BitstreamWriter &Stream,
1578 const std::string &TT) {
1579 unsigned CPUType = ~0U;
1581 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
1582 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
1583 // number from /usr/include/mach/machine.h. It is ok to reproduce the
1584 // specific constants here because they are implicitly part of the Darwin ABI.
1586 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
1587 DARWIN_CPU_TYPE_X86 = 7,
1588 DARWIN_CPU_TYPE_ARM = 12,
1589 DARWIN_CPU_TYPE_POWERPC = 18
1592 if (TT.find("x86_64-") == 0)
1593 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
1594 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
1595 TT[4] == '-' && TT[1] - '3' < 6)
1596 CPUType = DARWIN_CPU_TYPE_X86;
1597 else if (TT.find("powerpc-") == 0)
1598 CPUType = DARWIN_CPU_TYPE_POWERPC;
1599 else if (TT.find("powerpc64-") == 0)
1600 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
1601 else if (isARMTriplet(TT))
1602 CPUType = DARWIN_CPU_TYPE_ARM;
1604 // Traditional Bitcode starts after header.
1605 unsigned BCOffset = DarwinBCHeaderSize;
1607 Stream.Emit(0x0B17C0DE, 32);
1608 Stream.Emit(0 , 32); // Version.
1609 Stream.Emit(BCOffset , 32);
1610 Stream.Emit(0 , 32); // Filled in later.
1611 Stream.Emit(CPUType , 32);
1614 /// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and
1615 /// finalize the header.
1616 static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) {
1617 // Update the size field in the header.
1618 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize);
1620 // If the file is not a multiple of 16 bytes, insert dummy padding.
1621 while (BufferSize & 15) {
1628 /// WriteBitcodeToFile - Write the specified module to the specified output
1630 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
1631 std::vector<unsigned char> Buffer;
1632 BitstreamWriter Stream(Buffer);
1634 Buffer.reserve(256*1024);
1636 WriteBitcodeToStream( M, Stream );
1638 // Write the generated bitstream to "Out".
1639 Out.write((char*)&Buffer.front(), Buffer.size());
1642 /// WriteBitcodeToStream - Write the specified module to the specified output
1644 void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) {
1645 // If this is darwin, emit a file header and trailer if needed.
1646 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos;
1648 EmitDarwinBCHeader(Stream, M->getTargetTriple());
1650 // Emit the file header.
1651 Stream.Emit((unsigned)'B', 8);
1652 Stream.Emit((unsigned)'C', 8);
1653 Stream.Emit(0x0, 4);
1654 Stream.Emit(0xC, 4);
1655 Stream.Emit(0xE, 4);
1656 Stream.Emit(0xD, 4);
1659 WriteModule(M, Stream);
1662 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());