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_UNION.
185 Abbv = new BitCodeAbbrev();
186 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_UNION));
187 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
188 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
189 Log2_32_Ceil(VE.getTypes().size()+1)));
190 unsigned UnionAbbrev = Stream.EmitAbbrev(Abbv);
192 // Abbrev for TYPE_CODE_ARRAY.
193 Abbv = new BitCodeAbbrev();
194 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
195 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
196 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
197 Log2_32_Ceil(VE.getTypes().size()+1)));
198 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
200 // Emit an entry count so the reader can reserve space.
201 TypeVals.push_back(TypeList.size());
202 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
205 // Loop over all of the types, emitting each in turn.
206 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
207 const Type *T = TypeList[i].first;
211 switch (T->getTypeID()) {
212 default: llvm_unreachable("Unknown type!");
213 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
214 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
215 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
216 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
217 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
218 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
219 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
220 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break;
221 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
222 case Type::IntegerTyID:
224 Code = bitc::TYPE_CODE_INTEGER;
225 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
227 case Type::PointerTyID: {
228 const PointerType *PTy = cast<PointerType>(T);
229 // POINTER: [pointee type, address space]
230 Code = bitc::TYPE_CODE_POINTER;
231 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
232 unsigned AddressSpace = PTy->getAddressSpace();
233 TypeVals.push_back(AddressSpace);
234 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
237 case Type::FunctionTyID: {
238 const FunctionType *FT = cast<FunctionType>(T);
239 // FUNCTION: [isvararg, attrid, retty, paramty x N]
240 Code = bitc::TYPE_CODE_FUNCTION;
241 TypeVals.push_back(FT->isVarArg());
242 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0
243 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
244 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
245 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
246 AbbrevToUse = FunctionAbbrev;
249 case Type::StructTyID: {
250 const StructType *ST = cast<StructType>(T);
251 // STRUCT: [ispacked, eltty x N]
252 Code = bitc::TYPE_CODE_STRUCT;
253 TypeVals.push_back(ST->isPacked());
254 // Output all of the element types.
255 for (StructType::element_iterator I = ST->element_begin(),
256 E = ST->element_end(); I != E; ++I)
257 TypeVals.push_back(VE.getTypeID(*I));
258 AbbrevToUse = StructAbbrev;
261 case Type::UnionTyID: {
262 const UnionType *UT = cast<UnionType>(T);
263 // UNION: [eltty x N]
264 Code = bitc::TYPE_CODE_UNION;
265 // Output all of the element types.
266 for (UnionType::element_iterator I = UT->element_begin(),
267 E = UT->element_end(); I != E; ++I)
268 TypeVals.push_back(VE.getTypeID(*I));
269 AbbrevToUse = UnionAbbrev;
272 case Type::ArrayTyID: {
273 const ArrayType *AT = cast<ArrayType>(T);
274 // ARRAY: [numelts, eltty]
275 Code = bitc::TYPE_CODE_ARRAY;
276 TypeVals.push_back(AT->getNumElements());
277 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
278 AbbrevToUse = ArrayAbbrev;
281 case Type::VectorTyID: {
282 const VectorType *VT = cast<VectorType>(T);
283 // VECTOR [numelts, eltty]
284 Code = bitc::TYPE_CODE_VECTOR;
285 TypeVals.push_back(VT->getNumElements());
286 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
291 // Emit the finished record.
292 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
299 static unsigned getEncodedLinkage(const GlobalValue *GV) {
300 switch (GV->getLinkage()) {
301 default: llvm_unreachable("Invalid linkage!");
302 case GlobalValue::ExternalLinkage: return 0;
303 case GlobalValue::WeakAnyLinkage: return 1;
304 case GlobalValue::AppendingLinkage: return 2;
305 case GlobalValue::InternalLinkage: return 3;
306 case GlobalValue::LinkOnceAnyLinkage: return 4;
307 case GlobalValue::DLLImportLinkage: return 5;
308 case GlobalValue::DLLExportLinkage: return 6;
309 case GlobalValue::ExternalWeakLinkage: return 7;
310 case GlobalValue::CommonLinkage: return 8;
311 case GlobalValue::PrivateLinkage: return 9;
312 case GlobalValue::WeakODRLinkage: return 10;
313 case GlobalValue::LinkOnceODRLinkage: return 11;
314 case GlobalValue::AvailableExternallyLinkage: return 12;
315 case GlobalValue::LinkerPrivateLinkage: return 13;
319 static unsigned getEncodedVisibility(const GlobalValue *GV) {
320 switch (GV->getVisibility()) {
321 default: llvm_unreachable("Invalid visibility!");
322 case GlobalValue::DefaultVisibility: return 0;
323 case GlobalValue::HiddenVisibility: return 1;
324 case GlobalValue::ProtectedVisibility: return 2;
328 // Emit top-level description of module, including target triple, inline asm,
329 // descriptors for global variables, and function prototype info.
330 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
331 BitstreamWriter &Stream) {
332 // Emit the list of dependent libraries for the Module.
333 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
334 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
336 // Emit various pieces of data attached to a module.
337 if (!M->getTargetTriple().empty())
338 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
340 if (!M->getDataLayout().empty())
341 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
343 if (!M->getModuleInlineAsm().empty())
344 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
347 // Emit information about sections and GC, computing how many there are. Also
348 // compute the maximum alignment value.
349 std::map<std::string, unsigned> SectionMap;
350 std::map<std::string, unsigned> GCMap;
351 unsigned MaxAlignment = 0;
352 unsigned MaxGlobalType = 0;
353 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
355 MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
356 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
358 if (!GV->hasSection()) continue;
359 // Give section names unique ID's.
360 unsigned &Entry = SectionMap[GV->getSection()];
361 if (Entry != 0) continue;
362 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
364 Entry = SectionMap.size();
366 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
367 MaxAlignment = std::max(MaxAlignment, F->getAlignment());
368 if (F->hasSection()) {
369 // Give section names unique ID's.
370 unsigned &Entry = SectionMap[F->getSection()];
372 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
374 Entry = SectionMap.size();
378 // Same for GC names.
379 unsigned &Entry = GCMap[F->getGC()];
381 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(),
383 Entry = GCMap.size();
388 // Emit abbrev for globals, now that we know # sections and max alignment.
389 unsigned SimpleGVarAbbrev = 0;
390 if (!M->global_empty()) {
391 // Add an abbrev for common globals with no visibility or thread localness.
392 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
393 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
394 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
395 Log2_32_Ceil(MaxGlobalType+1)));
396 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
397 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
398 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage.
399 if (MaxAlignment == 0) // Alignment.
400 Abbv->Add(BitCodeAbbrevOp(0));
402 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
403 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
404 Log2_32_Ceil(MaxEncAlignment+1)));
406 if (SectionMap.empty()) // Section.
407 Abbv->Add(BitCodeAbbrevOp(0));
409 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
410 Log2_32_Ceil(SectionMap.size()+1)));
411 // Don't bother emitting vis + thread local.
412 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
415 // Emit the global variable information.
416 SmallVector<unsigned, 64> Vals;
417 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
419 unsigned AbbrevToUse = 0;
421 // GLOBALVAR: [type, isconst, initid,
422 // linkage, alignment, section, visibility, threadlocal]
423 Vals.push_back(VE.getTypeID(GV->getType()));
424 Vals.push_back(GV->isConstant());
425 Vals.push_back(GV->isDeclaration() ? 0 :
426 (VE.getValueID(GV->getInitializer()) + 1));
427 Vals.push_back(getEncodedLinkage(GV));
428 Vals.push_back(Log2_32(GV->getAlignment())+1);
429 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
430 if (GV->isThreadLocal() ||
431 GV->getVisibility() != GlobalValue::DefaultVisibility) {
432 Vals.push_back(getEncodedVisibility(GV));
433 Vals.push_back(GV->isThreadLocal());
435 AbbrevToUse = SimpleGVarAbbrev;
438 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
442 // Emit the function proto information.
443 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
444 // FUNCTION: [type, callingconv, isproto, paramattr,
445 // linkage, alignment, section, visibility, gc]
446 Vals.push_back(VE.getTypeID(F->getType()));
447 Vals.push_back(F->getCallingConv());
448 Vals.push_back(F->isDeclaration());
449 Vals.push_back(getEncodedLinkage(F));
450 Vals.push_back(VE.getAttributeID(F->getAttributes()));
451 Vals.push_back(Log2_32(F->getAlignment())+1);
452 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
453 Vals.push_back(getEncodedVisibility(F));
454 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0);
456 unsigned AbbrevToUse = 0;
457 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
462 // Emit the alias information.
463 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
465 Vals.push_back(VE.getTypeID(AI->getType()));
466 Vals.push_back(VE.getValueID(AI->getAliasee()));
467 Vals.push_back(getEncodedLinkage(AI));
468 Vals.push_back(getEncodedVisibility(AI));
469 unsigned AbbrevToUse = 0;
470 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
475 static uint64_t GetOptimizationFlags(const Value *V) {
478 if (const OverflowingBinaryOperator *OBO =
479 dyn_cast<OverflowingBinaryOperator>(V)) {
480 if (OBO->hasNoSignedWrap())
481 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
482 if (OBO->hasNoUnsignedWrap())
483 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
484 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) {
486 Flags |= 1 << bitc::SDIV_EXACT;
492 static void WriteMDNode(const MDNode *N,
493 const ValueEnumerator &VE,
494 BitstreamWriter &Stream,
495 SmallVector<uint64_t, 64> &Record) {
496 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
497 if (N->getOperand(i)) {
498 Record.push_back(VE.getTypeID(N->getOperand(i)->getType()));
499 Record.push_back(VE.getValueID(N->getOperand(i)));
501 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
505 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE :
507 Stream.EmitRecord(MDCode, Record, 0);
511 static void WriteModuleMetadata(const ValueEnumerator &VE,
512 BitstreamWriter &Stream) {
513 const ValueEnumerator::ValueList &Vals = VE.getMDValues();
514 bool StartedMetadataBlock = false;
515 unsigned MDSAbbrev = 0;
516 SmallVector<uint64_t, 64> Record;
517 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
519 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
520 if (!N->isFunctionLocal() || !N->getFunction()) {
521 if (!StartedMetadataBlock) {
522 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
523 StartedMetadataBlock = true;
525 WriteMDNode(N, VE, Stream, Record);
527 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
528 if (!StartedMetadataBlock) {
529 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
531 // Abbrev for METADATA_STRING.
532 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
533 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
534 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
535 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
536 MDSAbbrev = Stream.EmitAbbrev(Abbv);
537 StartedMetadataBlock = true;
540 // Code: [strchar x N]
541 Record.append(MDS->begin(), MDS->end());
543 // Emit the finished record.
544 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
546 } else if (const NamedMDNode *NMD = dyn_cast<NamedMDNode>(Vals[i].first)) {
547 if (!StartedMetadataBlock) {
548 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
549 StartedMetadataBlock = true;
553 StringRef Str = NMD->getName();
554 for (unsigned i = 0, e = Str.size(); i != e; ++i)
555 Record.push_back(Str[i]);
556 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
559 // Write named metadata operands.
560 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
561 if (NMD->getOperand(i))
562 Record.push_back(VE.getValueID(NMD->getOperand(i)));
564 Record.push_back(~0U);
566 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
571 if (StartedMetadataBlock)
575 static void WriteFunctionLocalMetadata(const Function &F,
576 const ValueEnumerator &VE,
577 BitstreamWriter &Stream) {
578 bool StartedMetadataBlock = false;
579 SmallVector<uint64_t, 64> Record;
580 const ValueEnumerator::ValueList &Vals = VE.getMDValues();
582 for (unsigned i = 0, e = Vals.size(); i != e; ++i)
583 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first))
584 if (N->isFunctionLocal() && N->getFunction() == &F) {
585 if (!StartedMetadataBlock) {
586 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
587 StartedMetadataBlock = true;
589 WriteMDNode(N, VE, Stream, Record);
592 if (StartedMetadataBlock)
596 static void WriteMetadataAttachment(const Function &F,
597 const ValueEnumerator &VE,
598 BitstreamWriter &Stream) {
599 bool StartedMetadataBlock = false;
600 SmallVector<uint64_t, 64> Record;
602 // Write metadata attachments
603 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
604 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
606 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
607 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
610 I->getAllMetadata(MDs);
612 // If no metadata, ignore instruction.
613 if (MDs.empty()) continue;
615 Record.push_back(VE.getInstructionID(I));
617 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
618 Record.push_back(MDs[i].first);
619 Record.push_back(VE.getValueID(MDs[i].second));
621 if (!StartedMetadataBlock) {
622 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
623 StartedMetadataBlock = true;
625 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
629 if (StartedMetadataBlock)
633 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
634 SmallVector<uint64_t, 64> Record;
636 // Write metadata kinds
637 // METADATA_KIND - [n x [id, name]]
638 SmallVector<StringRef, 4> Names;
639 M->getMDKindNames(Names);
641 assert(Names[0] == "" && "MDKind #0 is invalid");
642 if (Names.size() == 1) return;
644 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
646 for (unsigned MDKindID = 1, e = Names.size(); MDKindID != e; ++MDKindID) {
647 Record.push_back(MDKindID);
648 StringRef KName = Names[MDKindID];
649 Record.append(KName.begin(), KName.end());
651 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
658 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
659 const ValueEnumerator &VE,
660 BitstreamWriter &Stream, bool isGlobal) {
661 if (FirstVal == LastVal) return;
663 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
665 unsigned AggregateAbbrev = 0;
666 unsigned String8Abbrev = 0;
667 unsigned CString7Abbrev = 0;
668 unsigned CString6Abbrev = 0;
669 // If this is a constant pool for the module, emit module-specific abbrevs.
671 // Abbrev for CST_CODE_AGGREGATE.
672 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
673 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
674 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
675 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
676 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
678 // Abbrev for CST_CODE_STRING.
679 Abbv = new BitCodeAbbrev();
680 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
681 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
682 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
683 String8Abbrev = Stream.EmitAbbrev(Abbv);
684 // Abbrev for CST_CODE_CSTRING.
685 Abbv = new BitCodeAbbrev();
686 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
687 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
688 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
689 CString7Abbrev = Stream.EmitAbbrev(Abbv);
690 // Abbrev for CST_CODE_CSTRING.
691 Abbv = new BitCodeAbbrev();
692 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
693 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
694 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
695 CString6Abbrev = Stream.EmitAbbrev(Abbv);
698 SmallVector<uint64_t, 64> Record;
700 const ValueEnumerator::ValueList &Vals = VE.getValues();
701 const Type *LastTy = 0;
702 for (unsigned i = FirstVal; i != LastVal; ++i) {
703 const Value *V = Vals[i].first;
704 // If we need to switch types, do so now.
705 if (V->getType() != LastTy) {
706 LastTy = V->getType();
707 Record.push_back(VE.getTypeID(LastTy));
708 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
709 CONSTANTS_SETTYPE_ABBREV);
713 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
714 Record.push_back(unsigned(IA->hasSideEffects()) |
715 unsigned(IA->isAlignStack()) << 1);
717 // Add the asm string.
718 const std::string &AsmStr = IA->getAsmString();
719 Record.push_back(AsmStr.size());
720 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
721 Record.push_back(AsmStr[i]);
723 // Add the constraint string.
724 const std::string &ConstraintStr = IA->getConstraintString();
725 Record.push_back(ConstraintStr.size());
726 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
727 Record.push_back(ConstraintStr[i]);
728 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
732 const Constant *C = cast<Constant>(V);
734 unsigned AbbrevToUse = 0;
735 if (C->isNullValue()) {
736 Code = bitc::CST_CODE_NULL;
737 } else if (isa<UndefValue>(C)) {
738 Code = bitc::CST_CODE_UNDEF;
739 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
740 if (IV->getBitWidth() <= 64) {
741 int64_t V = IV->getSExtValue();
743 Record.push_back(V << 1);
745 Record.push_back((-V << 1) | 1);
746 Code = bitc::CST_CODE_INTEGER;
747 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
748 } else { // Wide integers, > 64 bits in size.
749 // We have an arbitrary precision integer value to write whose
750 // bit width is > 64. However, in canonical unsigned integer
751 // format it is likely that the high bits are going to be zero.
752 // So, we only write the number of active words.
753 unsigned NWords = IV->getValue().getActiveWords();
754 const uint64_t *RawWords = IV->getValue().getRawData();
755 for (unsigned i = 0; i != NWords; ++i) {
756 int64_t V = RawWords[i];
758 Record.push_back(V << 1);
760 Record.push_back((-V << 1) | 1);
762 Code = bitc::CST_CODE_WIDE_INTEGER;
764 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
765 Code = bitc::CST_CODE_FLOAT;
766 const Type *Ty = CFP->getType();
767 if (Ty->isFloatTy() || Ty->isDoubleTy()) {
768 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
769 } else if (Ty->isX86_FP80Ty()) {
770 // api needed to prevent premature destruction
771 // bits are not in the same order as a normal i80 APInt, compensate.
772 APInt api = CFP->getValueAPF().bitcastToAPInt();
773 const uint64_t *p = api.getRawData();
774 Record.push_back((p[1] << 48) | (p[0] >> 16));
775 Record.push_back(p[0] & 0xffffLL);
776 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
777 APInt api = CFP->getValueAPF().bitcastToAPInt();
778 const uint64_t *p = api.getRawData();
779 Record.push_back(p[0]);
780 Record.push_back(p[1]);
782 assert (0 && "Unknown FP type!");
784 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
785 const ConstantArray *CA = cast<ConstantArray>(C);
786 // Emit constant strings specially.
787 unsigned NumOps = CA->getNumOperands();
788 // If this is a null-terminated string, use the denser CSTRING encoding.
789 if (CA->getOperand(NumOps-1)->isNullValue()) {
790 Code = bitc::CST_CODE_CSTRING;
791 --NumOps; // Don't encode the null, which isn't allowed by char6.
793 Code = bitc::CST_CODE_STRING;
794 AbbrevToUse = String8Abbrev;
796 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
797 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
798 for (unsigned i = 0; i != NumOps; ++i) {
799 unsigned char V = cast<ConstantInt>(CA->getOperand(i))->getZExtValue();
801 isCStr7 &= (V & 128) == 0;
803 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
807 AbbrevToUse = CString6Abbrev;
809 AbbrevToUse = CString7Abbrev;
810 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
811 isa<ConstantVector>(V)) {
812 Code = bitc::CST_CODE_AGGREGATE;
813 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
814 Record.push_back(VE.getValueID(C->getOperand(i)));
815 AbbrevToUse = AggregateAbbrev;
816 } else if (isa<ConstantUnion>(C)) {
817 Code = bitc::CST_CODE_AGGREGATE;
819 // Unions only have one entry but we must send type along with it.
820 const Type *EntryKind = C->getOperand(0)->getType();
822 const UnionType *UnTy = cast<UnionType>(C->getType());
823 int UnionIndex = UnTy->getElementTypeIndex(EntryKind);
824 assert(UnionIndex != -1 && "Constant union contains invalid entry");
826 Record.push_back(UnionIndex);
827 Record.push_back(VE.getValueID(C->getOperand(0)));
829 AbbrevToUse = AggregateAbbrev;
830 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
831 switch (CE->getOpcode()) {
833 if (Instruction::isCast(CE->getOpcode())) {
834 Code = bitc::CST_CODE_CE_CAST;
835 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
836 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
837 Record.push_back(VE.getValueID(C->getOperand(0)));
838 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
840 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
841 Code = bitc::CST_CODE_CE_BINOP;
842 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
843 Record.push_back(VE.getValueID(C->getOperand(0)));
844 Record.push_back(VE.getValueID(C->getOperand(1)));
845 uint64_t Flags = GetOptimizationFlags(CE);
847 Record.push_back(Flags);
850 case Instruction::GetElementPtr:
851 Code = bitc::CST_CODE_CE_GEP;
852 if (cast<GEPOperator>(C)->isInBounds())
853 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
854 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
855 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
856 Record.push_back(VE.getValueID(C->getOperand(i)));
859 case Instruction::Select:
860 Code = bitc::CST_CODE_CE_SELECT;
861 Record.push_back(VE.getValueID(C->getOperand(0)));
862 Record.push_back(VE.getValueID(C->getOperand(1)));
863 Record.push_back(VE.getValueID(C->getOperand(2)));
865 case Instruction::ExtractElement:
866 Code = bitc::CST_CODE_CE_EXTRACTELT;
867 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
868 Record.push_back(VE.getValueID(C->getOperand(0)));
869 Record.push_back(VE.getValueID(C->getOperand(1)));
871 case Instruction::InsertElement:
872 Code = bitc::CST_CODE_CE_INSERTELT;
873 Record.push_back(VE.getValueID(C->getOperand(0)));
874 Record.push_back(VE.getValueID(C->getOperand(1)));
875 Record.push_back(VE.getValueID(C->getOperand(2)));
877 case Instruction::ShuffleVector:
878 // If the return type and argument types are the same, this is a
879 // standard shufflevector instruction. If the types are different,
880 // then the shuffle is widening or truncating the input vectors, and
881 // the argument type must also be encoded.
882 if (C->getType() == C->getOperand(0)->getType()) {
883 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
885 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
886 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
888 Record.push_back(VE.getValueID(C->getOperand(0)));
889 Record.push_back(VE.getValueID(C->getOperand(1)));
890 Record.push_back(VE.getValueID(C->getOperand(2)));
892 case Instruction::ICmp:
893 case Instruction::FCmp:
894 Code = bitc::CST_CODE_CE_CMP;
895 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
896 Record.push_back(VE.getValueID(C->getOperand(0)));
897 Record.push_back(VE.getValueID(C->getOperand(1)));
898 Record.push_back(CE->getPredicate());
901 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
902 assert(BA->getFunction() == BA->getBasicBlock()->getParent() &&
903 "Malformed blockaddress");
904 Code = bitc::CST_CODE_BLOCKADDRESS;
905 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
906 Record.push_back(VE.getValueID(BA->getFunction()));
907 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
909 llvm_unreachable("Unknown constant!");
911 Stream.EmitRecord(Code, Record, AbbrevToUse);
918 static void WriteModuleConstants(const ValueEnumerator &VE,
919 BitstreamWriter &Stream) {
920 const ValueEnumerator::ValueList &Vals = VE.getValues();
922 // Find the first constant to emit, which is the first non-globalvalue value.
923 // We know globalvalues have been emitted by WriteModuleInfo.
924 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
925 if (!isa<GlobalValue>(Vals[i].first)) {
926 WriteConstants(i, Vals.size(), VE, Stream, true);
932 /// PushValueAndType - The file has to encode both the value and type id for
933 /// many values, because we need to know what type to create for forward
934 /// references. However, most operands are not forward references, so this type
935 /// field is not needed.
937 /// This function adds V's value ID to Vals. If the value ID is higher than the
938 /// instruction ID, then it is a forward reference, and it also includes the
940 static bool PushValueAndType(const Value *V, unsigned InstID,
941 SmallVector<unsigned, 64> &Vals,
942 ValueEnumerator &VE) {
943 unsigned ValID = VE.getValueID(V);
944 Vals.push_back(ValID);
945 if (ValID >= InstID) {
946 Vals.push_back(VE.getTypeID(V->getType()));
952 /// WriteInstruction - Emit an instruction to the specified stream.
953 static void WriteInstruction(const Instruction &I, unsigned InstID,
954 ValueEnumerator &VE, BitstreamWriter &Stream,
955 SmallVector<unsigned, 64> &Vals) {
957 unsigned AbbrevToUse = 0;
958 VE.setInstructionID(&I);
959 switch (I.getOpcode()) {
961 if (Instruction::isCast(I.getOpcode())) {
962 Code = bitc::FUNC_CODE_INST_CAST;
963 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
964 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
965 Vals.push_back(VE.getTypeID(I.getType()));
966 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
968 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
969 Code = bitc::FUNC_CODE_INST_BINOP;
970 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
971 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
972 Vals.push_back(VE.getValueID(I.getOperand(1)));
973 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
974 uint64_t Flags = GetOptimizationFlags(&I);
976 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
977 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
978 Vals.push_back(Flags);
983 case Instruction::GetElementPtr:
984 Code = bitc::FUNC_CODE_INST_GEP;
985 if (cast<GEPOperator>(&I)->isInBounds())
986 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP;
987 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
988 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
990 case Instruction::ExtractValue: {
991 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
992 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
993 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
994 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
998 case Instruction::InsertValue: {
999 Code = bitc::FUNC_CODE_INST_INSERTVAL;
1000 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1001 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1002 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
1003 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
1007 case Instruction::Select:
1008 Code = bitc::FUNC_CODE_INST_VSELECT;
1009 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1010 Vals.push_back(VE.getValueID(I.getOperand(2)));
1011 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1013 case Instruction::ExtractElement:
1014 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
1015 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1016 Vals.push_back(VE.getValueID(I.getOperand(1)));
1018 case Instruction::InsertElement:
1019 Code = bitc::FUNC_CODE_INST_INSERTELT;
1020 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1021 Vals.push_back(VE.getValueID(I.getOperand(1)));
1022 Vals.push_back(VE.getValueID(I.getOperand(2)));
1024 case Instruction::ShuffleVector:
1025 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
1026 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1027 Vals.push_back(VE.getValueID(I.getOperand(1)));
1028 Vals.push_back(VE.getValueID(I.getOperand(2)));
1030 case Instruction::ICmp:
1031 case Instruction::FCmp:
1032 // compare returning Int1Ty or vector of Int1Ty
1033 Code = bitc::FUNC_CODE_INST_CMP2;
1034 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1035 Vals.push_back(VE.getValueID(I.getOperand(1)));
1036 Vals.push_back(cast<CmpInst>(I).getPredicate());
1039 case Instruction::Ret:
1041 Code = bitc::FUNC_CODE_INST_RET;
1042 unsigned NumOperands = I.getNumOperands();
1043 if (NumOperands == 0)
1044 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
1045 else if (NumOperands == 1) {
1046 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1047 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
1049 for (unsigned i = 0, e = NumOperands; i != e; ++i)
1050 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1054 case Instruction::Br:
1056 Code = bitc::FUNC_CODE_INST_BR;
1057 BranchInst &II = cast<BranchInst>(I);
1058 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
1059 if (II.isConditional()) {
1060 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
1061 Vals.push_back(VE.getValueID(II.getCondition()));
1065 case Instruction::Switch:
1066 Code = bitc::FUNC_CODE_INST_SWITCH;
1067 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1068 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1069 Vals.push_back(VE.getValueID(I.getOperand(i)));
1071 case Instruction::IndirectBr:
1072 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
1073 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1074 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1075 Vals.push_back(VE.getValueID(I.getOperand(i)));
1078 case Instruction::Invoke: {
1079 const InvokeInst *II = cast<InvokeInst>(&I);
1080 const Value *Callee(II->getCalledValue());
1081 const PointerType *PTy = cast<PointerType>(Callee->getType());
1082 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1083 Code = bitc::FUNC_CODE_INST_INVOKE;
1085 Vals.push_back(VE.getAttributeID(II->getAttributes()));
1086 Vals.push_back(II->getCallingConv());
1087 Vals.push_back(VE.getValueID(II->getNormalDest()));
1088 Vals.push_back(VE.getValueID(II->getUnwindDest()));
1089 PushValueAndType(Callee, InstID, Vals, VE);
1091 // Emit value #'s for the fixed parameters.
1092 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1093 Vals.push_back(VE.getValueID(I.getOperand(i))); // fixed param.
1095 // Emit type/value pairs for varargs params.
1096 if (FTy->isVarArg()) {
1097 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3;
1099 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
1103 case Instruction::Unwind:
1104 Code = bitc::FUNC_CODE_INST_UNWIND;
1106 case Instruction::Unreachable:
1107 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
1108 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
1111 case Instruction::PHI:
1112 Code = bitc::FUNC_CODE_INST_PHI;
1113 Vals.push_back(VE.getTypeID(I.getType()));
1114 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1115 Vals.push_back(VE.getValueID(I.getOperand(i)));
1118 case Instruction::Alloca:
1119 Code = bitc::FUNC_CODE_INST_ALLOCA;
1120 Vals.push_back(VE.getTypeID(I.getType()));
1121 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1122 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
1125 case Instruction::Load:
1126 Code = bitc::FUNC_CODE_INST_LOAD;
1127 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1128 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1130 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1131 Vals.push_back(cast<LoadInst>(I).isVolatile());
1133 case Instruction::Store:
1134 Code = bitc::FUNC_CODE_INST_STORE2;
1135 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1136 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
1137 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1138 Vals.push_back(cast<StoreInst>(I).isVolatile());
1140 case Instruction::Call: {
1141 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
1142 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1144 Code = bitc::FUNC_CODE_INST_CALL;
1146 const CallInst *CI = cast<CallInst>(&I);
1147 Vals.push_back(VE.getAttributeID(CI->getAttributes()));
1148 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall()));
1149 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee
1151 // Emit value #'s for the fixed parameters.
1152 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1153 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param.
1155 // Emit type/value pairs for varargs params.
1156 if (FTy->isVarArg()) {
1157 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams();
1158 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands();
1160 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs
1164 case Instruction::VAArg:
1165 Code = bitc::FUNC_CODE_INST_VAARG;
1166 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
1167 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
1168 Vals.push_back(VE.getTypeID(I.getType())); // restype.
1172 Stream.EmitRecord(Code, Vals, AbbrevToUse);
1176 // Emit names for globals/functions etc.
1177 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
1178 const ValueEnumerator &VE,
1179 BitstreamWriter &Stream) {
1180 if (VST.empty()) return;
1181 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
1183 // FIXME: Set up the abbrev, we know how many values there are!
1184 // FIXME: We know if the type names can use 7-bit ascii.
1185 SmallVector<unsigned, 64> NameVals;
1187 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
1190 const ValueName &Name = *SI;
1192 // Figure out the encoding to use for the name.
1194 bool isChar6 = true;
1195 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
1198 isChar6 = BitCodeAbbrevOp::isChar6(*C);
1199 if ((unsigned char)*C & 128) {
1201 break; // don't bother scanning the rest.
1205 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
1207 // VST_ENTRY: [valueid, namechar x N]
1208 // VST_BBENTRY: [bbid, namechar x N]
1210 if (isa<BasicBlock>(SI->getValue())) {
1211 Code = bitc::VST_CODE_BBENTRY;
1213 AbbrevToUse = VST_BBENTRY_6_ABBREV;
1215 Code = bitc::VST_CODE_ENTRY;
1217 AbbrevToUse = VST_ENTRY_6_ABBREV;
1219 AbbrevToUse = VST_ENTRY_7_ABBREV;
1222 NameVals.push_back(VE.getValueID(SI->getValue()));
1223 for (const char *P = Name.getKeyData(),
1224 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
1225 NameVals.push_back((unsigned char)*P);
1227 // Emit the finished record.
1228 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
1234 /// WriteFunction - Emit a function body to the module stream.
1235 static void WriteFunction(const Function &F, ValueEnumerator &VE,
1236 BitstreamWriter &Stream) {
1237 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
1238 VE.incorporateFunction(F);
1240 SmallVector<unsigned, 64> Vals;
1242 // Emit the number of basic blocks, so the reader can create them ahead of
1244 Vals.push_back(VE.getBasicBlocks().size());
1245 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
1248 // If there are function-local constants, emit them now.
1249 unsigned CstStart, CstEnd;
1250 VE.getFunctionConstantRange(CstStart, CstEnd);
1251 WriteConstants(CstStart, CstEnd, VE, Stream, false);
1253 // If there is function-local metadata, emit it now.
1254 WriteFunctionLocalMetadata(F, VE, Stream);
1256 // Keep a running idea of what the instruction ID is.
1257 unsigned InstID = CstEnd;
1259 // Finally, emit all the instructions, in order.
1260 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
1261 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
1263 WriteInstruction(*I, InstID, VE, Stream, Vals);
1264 if (!I->getType()->isVoidTy())
1268 // Emit names for all the instructions etc.
1269 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1271 WriteMetadataAttachment(F, VE, Stream);
1276 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
1277 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
1278 const ValueEnumerator &VE,
1279 BitstreamWriter &Stream) {
1280 if (TST.empty()) return;
1282 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
1284 // 7-bit fixed width VST_CODE_ENTRY strings.
1285 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1286 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1287 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1288 Log2_32_Ceil(VE.getTypes().size()+1)));
1289 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1290 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1291 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
1293 SmallVector<unsigned, 64> NameVals;
1295 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1297 // TST_ENTRY: [typeid, namechar x N]
1298 NameVals.push_back(VE.getTypeID(TI->second));
1300 const std::string &Str = TI->first;
1302 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1303 NameVals.push_back((unsigned char)Str[i]);
1308 // Emit the finished record.
1309 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1316 // Emit blockinfo, which defines the standard abbreviations etc.
1317 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1318 // We only want to emit block info records for blocks that have multiple
1319 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1320 // blocks can defined their abbrevs inline.
1321 Stream.EnterBlockInfoBlock(2);
1323 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1324 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1325 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1326 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1327 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1328 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1329 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1330 Abbv) != VST_ENTRY_8_ABBREV)
1331 llvm_unreachable("Unexpected abbrev ordering!");
1334 { // 7-bit fixed width VST_ENTRY strings.
1335 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1336 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1337 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1338 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1339 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1340 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1341 Abbv) != VST_ENTRY_7_ABBREV)
1342 llvm_unreachable("Unexpected abbrev ordering!");
1344 { // 6-bit char6 VST_ENTRY strings.
1345 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1346 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1347 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1348 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1349 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1350 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1351 Abbv) != VST_ENTRY_6_ABBREV)
1352 llvm_unreachable("Unexpected abbrev ordering!");
1354 { // 6-bit char6 VST_BBENTRY strings.
1355 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1356 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1357 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1358 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1359 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1360 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1361 Abbv) != VST_BBENTRY_6_ABBREV)
1362 llvm_unreachable("Unexpected abbrev ordering!");
1367 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1368 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1369 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1370 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1371 Log2_32_Ceil(VE.getTypes().size()+1)));
1372 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1373 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1374 llvm_unreachable("Unexpected abbrev ordering!");
1377 { // INTEGER abbrev for CONSTANTS_BLOCK.
1378 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1379 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1380 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1381 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1382 Abbv) != CONSTANTS_INTEGER_ABBREV)
1383 llvm_unreachable("Unexpected abbrev ordering!");
1386 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1387 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1388 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1389 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1390 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1391 Log2_32_Ceil(VE.getTypes().size()+1)));
1392 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1394 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1395 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1396 llvm_unreachable("Unexpected abbrev ordering!");
1398 { // NULL abbrev for CONSTANTS_BLOCK.
1399 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1400 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1401 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1402 Abbv) != CONSTANTS_NULL_Abbrev)
1403 llvm_unreachable("Unexpected abbrev ordering!");
1406 // FIXME: This should only use space for first class types!
1408 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1409 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1410 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1411 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1412 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1413 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1414 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1415 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1416 llvm_unreachable("Unexpected abbrev ordering!");
1418 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1419 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1420 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1421 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1422 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1423 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1424 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1425 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1426 llvm_unreachable("Unexpected abbrev ordering!");
1428 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1429 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1430 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1431 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1432 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1433 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1434 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1435 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1436 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1437 llvm_unreachable("Unexpected abbrev ordering!");
1439 { // INST_CAST abbrev for FUNCTION_BLOCK.
1440 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1441 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1442 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1443 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1444 Log2_32_Ceil(VE.getTypes().size()+1)));
1445 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1446 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1447 Abbv) != FUNCTION_INST_CAST_ABBREV)
1448 llvm_unreachable("Unexpected abbrev ordering!");
1451 { // INST_RET abbrev for FUNCTION_BLOCK.
1452 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1453 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1454 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1455 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1456 llvm_unreachable("Unexpected abbrev ordering!");
1458 { // INST_RET abbrev for FUNCTION_BLOCK.
1459 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1460 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1461 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1462 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1463 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1464 llvm_unreachable("Unexpected abbrev ordering!");
1466 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1467 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1468 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1469 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1470 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1471 llvm_unreachable("Unexpected abbrev ordering!");
1478 /// WriteModule - Emit the specified module to the bitstream.
1479 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1480 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1482 // Emit the version number if it is non-zero.
1484 SmallVector<unsigned, 1> Vals;
1485 Vals.push_back(CurVersion);
1486 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1489 // Analyze the module, enumerating globals, functions, etc.
1490 ValueEnumerator VE(M);
1492 // Emit blockinfo, which defines the standard abbreviations etc.
1493 WriteBlockInfo(VE, Stream);
1495 // Emit information about parameter attributes.
1496 WriteAttributeTable(VE, Stream);
1498 // Emit information describing all of the types in the module.
1499 WriteTypeTable(VE, Stream);
1501 // Emit top-level description of module, including target triple, inline asm,
1502 // descriptors for global variables, and function prototype info.
1503 WriteModuleInfo(M, VE, Stream);
1506 WriteModuleConstants(VE, Stream);
1509 WriteModuleMetadata(VE, Stream);
1511 // Emit function bodies.
1512 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1513 if (!I->isDeclaration())
1514 WriteFunction(*I, VE, Stream);
1517 WriteModuleMetadataStore(M, Stream);
1519 // Emit the type symbol table information.
1520 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1522 // Emit names for globals/functions etc.
1523 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1528 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1529 /// header and trailer to make it compatible with the system archiver. To do
1530 /// this we emit the following header, and then emit a trailer that pads the
1531 /// file out to be a multiple of 16 bytes.
1533 /// struct bc_header {
1534 /// uint32_t Magic; // 0x0B17C0DE
1535 /// uint32_t Version; // Version, currently always 0.
1536 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1537 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1538 /// uint32_t CPUType; // CPU specifier.
1539 /// ... potentially more later ...
1542 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
1543 DarwinBCHeaderSize = 5*4
1546 /// isARMTriplet - Return true if the triplet looks like:
1547 /// arm-*, thumb-*, armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*.
1548 static bool isARMTriplet(const std::string &TT) {
1550 size_t Size = TT.size();
1552 TT[0] == 't' && TT[1] == 'h' && TT[2] == 'u' &&
1553 TT[3] == 'm' && TT[4] == 'b')
1555 else if (Size >= 4 && TT[0] == 'a' && TT[1] == 'r' && TT[2] == 'm')
1562 else if (TT[Pos] == 'v') {
1563 if (Size >= Pos+4 &&
1564 TT[Pos+1] == '6' && TT[Pos+2] == 't' && TT[Pos+3] == '2')
1566 else if (Size >= Pos+4 &&
1567 TT[Pos+1] == '5' && TT[Pos+2] == 't' && TT[Pos+3] == 'e')
1571 while (++Pos < Size && TT[Pos] != '-') {
1572 if (!isdigit(TT[Pos]))
1578 static void EmitDarwinBCHeader(BitstreamWriter &Stream,
1579 const std::string &TT) {
1580 unsigned CPUType = ~0U;
1582 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
1583 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
1584 // number from /usr/include/mach/machine.h. It is ok to reproduce the
1585 // specific constants here because they are implicitly part of the Darwin ABI.
1587 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
1588 DARWIN_CPU_TYPE_X86 = 7,
1589 DARWIN_CPU_TYPE_ARM = 12,
1590 DARWIN_CPU_TYPE_POWERPC = 18
1593 if (TT.find("x86_64-") == 0)
1594 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
1595 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
1596 TT[4] == '-' && TT[1] - '3' < 6)
1597 CPUType = DARWIN_CPU_TYPE_X86;
1598 else if (TT.find("powerpc-") == 0)
1599 CPUType = DARWIN_CPU_TYPE_POWERPC;
1600 else if (TT.find("powerpc64-") == 0)
1601 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
1602 else if (isARMTriplet(TT))
1603 CPUType = DARWIN_CPU_TYPE_ARM;
1605 // Traditional Bitcode starts after header.
1606 unsigned BCOffset = DarwinBCHeaderSize;
1608 Stream.Emit(0x0B17C0DE, 32);
1609 Stream.Emit(0 , 32); // Version.
1610 Stream.Emit(BCOffset , 32);
1611 Stream.Emit(0 , 32); // Filled in later.
1612 Stream.Emit(CPUType , 32);
1615 /// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and
1616 /// finalize the header.
1617 static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) {
1618 // Update the size field in the header.
1619 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize);
1621 // If the file is not a multiple of 16 bytes, insert dummy padding.
1622 while (BufferSize & 15) {
1629 /// WriteBitcodeToFile - Write the specified module to the specified output
1631 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
1632 std::vector<unsigned char> Buffer;
1633 BitstreamWriter Stream(Buffer);
1635 Buffer.reserve(256*1024);
1637 WriteBitcodeToStream( M, Stream );
1639 // If writing to stdout, set binary mode.
1640 if (&llvm::outs() == &Out)
1641 sys::Program::ChangeStdoutToBinary();
1643 // Write the generated bitstream to "Out".
1644 Out.write((char*)&Buffer.front(), Buffer.size());
1646 // Make sure it hits disk now.
1650 /// WriteBitcodeToStream - Write the specified module to the specified output
1652 void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) {
1653 // If this is darwin, emit a file header and trailer if needed.
1654 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos;
1656 EmitDarwinBCHeader(Stream, M->getTargetTriple());
1658 // Emit the file header.
1659 Stream.Emit((unsigned)'B', 8);
1660 Stream.Emit((unsigned)'C', 8);
1661 Stream.Emit(0x0, 4);
1662 Stream.Emit(0xC, 4);
1663 Stream.Emit(0xE, 4);
1664 Stream.Emit(0xD, 4);
1667 WriteModule(M, Stream);
1670 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());