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;
316 case GlobalValue::LinkerPrivateWeakLinkage: return 14;
320 static unsigned getEncodedVisibility(const GlobalValue *GV) {
321 switch (GV->getVisibility()) {
322 default: llvm_unreachable("Invalid visibility!");
323 case GlobalValue::DefaultVisibility: return 0;
324 case GlobalValue::HiddenVisibility: return 1;
325 case GlobalValue::ProtectedVisibility: return 2;
329 // Emit top-level description of module, including target triple, inline asm,
330 // descriptors for global variables, and function prototype info.
331 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
332 BitstreamWriter &Stream) {
333 // Emit the list of dependent libraries for the Module.
334 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
335 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
337 // Emit various pieces of data attached to a module.
338 if (!M->getTargetTriple().empty())
339 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
341 if (!M->getDataLayout().empty())
342 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
344 if (!M->getModuleInlineAsm().empty())
345 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
348 // Emit information about sections and GC, computing how many there are. Also
349 // compute the maximum alignment value.
350 std::map<std::string, unsigned> SectionMap;
351 std::map<std::string, unsigned> GCMap;
352 unsigned MaxAlignment = 0;
353 unsigned MaxGlobalType = 0;
354 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
356 MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
357 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
359 if (!GV->hasSection()) continue;
360 // Give section names unique ID's.
361 unsigned &Entry = SectionMap[GV->getSection()];
362 if (Entry != 0) continue;
363 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
365 Entry = SectionMap.size();
367 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
368 MaxAlignment = std::max(MaxAlignment, F->getAlignment());
369 if (F->hasSection()) {
370 // Give section names unique ID's.
371 unsigned &Entry = SectionMap[F->getSection()];
373 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
375 Entry = SectionMap.size();
379 // Same for GC names.
380 unsigned &Entry = GCMap[F->getGC()];
382 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(),
384 Entry = GCMap.size();
389 // Emit abbrev for globals, now that we know # sections and max alignment.
390 unsigned SimpleGVarAbbrev = 0;
391 if (!M->global_empty()) {
392 // Add an abbrev for common globals with no visibility or thread localness.
393 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
394 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
395 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
396 Log2_32_Ceil(MaxGlobalType+1)));
397 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
398 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
399 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage.
400 if (MaxAlignment == 0) // Alignment.
401 Abbv->Add(BitCodeAbbrevOp(0));
403 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
404 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
405 Log2_32_Ceil(MaxEncAlignment+1)));
407 if (SectionMap.empty()) // Section.
408 Abbv->Add(BitCodeAbbrevOp(0));
410 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
411 Log2_32_Ceil(SectionMap.size()+1)));
412 // Don't bother emitting vis + thread local.
413 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
416 // Emit the global variable information.
417 SmallVector<unsigned, 64> Vals;
418 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
420 unsigned AbbrevToUse = 0;
422 // GLOBALVAR: [type, isconst, initid,
423 // linkage, alignment, section, visibility, threadlocal]
424 Vals.push_back(VE.getTypeID(GV->getType()));
425 Vals.push_back(GV->isConstant());
426 Vals.push_back(GV->isDeclaration() ? 0 :
427 (VE.getValueID(GV->getInitializer()) + 1));
428 Vals.push_back(getEncodedLinkage(GV));
429 Vals.push_back(Log2_32(GV->getAlignment())+1);
430 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
431 if (GV->isThreadLocal() ||
432 GV->getVisibility() != GlobalValue::DefaultVisibility) {
433 Vals.push_back(getEncodedVisibility(GV));
434 Vals.push_back(GV->isThreadLocal());
436 AbbrevToUse = SimpleGVarAbbrev;
439 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
443 // Emit the function proto information.
444 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
445 // FUNCTION: [type, callingconv, isproto, paramattr,
446 // linkage, alignment, section, visibility, gc]
447 Vals.push_back(VE.getTypeID(F->getType()));
448 Vals.push_back(F->getCallingConv());
449 Vals.push_back(F->isDeclaration());
450 Vals.push_back(getEncodedLinkage(F));
451 Vals.push_back(VE.getAttributeID(F->getAttributes()));
452 Vals.push_back(Log2_32(F->getAlignment())+1);
453 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
454 Vals.push_back(getEncodedVisibility(F));
455 Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0);
457 unsigned AbbrevToUse = 0;
458 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
463 // Emit the alias information.
464 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
466 Vals.push_back(VE.getTypeID(AI->getType()));
467 Vals.push_back(VE.getValueID(AI->getAliasee()));
468 Vals.push_back(getEncodedLinkage(AI));
469 Vals.push_back(getEncodedVisibility(AI));
470 unsigned AbbrevToUse = 0;
471 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
476 static uint64_t GetOptimizationFlags(const Value *V) {
479 if (const OverflowingBinaryOperator *OBO =
480 dyn_cast<OverflowingBinaryOperator>(V)) {
481 if (OBO->hasNoSignedWrap())
482 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
483 if (OBO->hasNoUnsignedWrap())
484 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
485 } else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) {
487 Flags |= 1 << bitc::SDIV_EXACT;
493 static void WriteMDNode(const MDNode *N,
494 const ValueEnumerator &VE,
495 BitstreamWriter &Stream,
496 SmallVector<uint64_t, 64> &Record) {
497 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
498 if (N->getOperand(i)) {
499 Record.push_back(VE.getTypeID(N->getOperand(i)->getType()));
500 Record.push_back(VE.getValueID(N->getOperand(i)));
502 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
506 unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE :
508 Stream.EmitRecord(MDCode, Record, 0);
512 static void WriteModuleMetadata(const Module *M,
513 const ValueEnumerator &VE,
514 BitstreamWriter &Stream) {
515 const ValueEnumerator::ValueList &Vals = VE.getMDValues();
516 bool StartedMetadataBlock = false;
517 unsigned MDSAbbrev = 0;
518 SmallVector<uint64_t, 64> Record;
519 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
521 if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
522 if (!N->isFunctionLocal() || !N->getFunction()) {
523 if (!StartedMetadataBlock) {
524 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
525 StartedMetadataBlock = true;
527 WriteMDNode(N, VE, Stream, Record);
529 } else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
530 if (!StartedMetadataBlock) {
531 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
533 // Abbrev for METADATA_STRING.
534 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
535 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
536 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
537 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
538 MDSAbbrev = Stream.EmitAbbrev(Abbv);
539 StartedMetadataBlock = true;
542 // Code: [strchar x N]
543 Record.append(MDS->begin(), MDS->end());
545 // Emit the finished record.
546 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
551 // Write named metadata.
552 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
553 E = M->named_metadata_end(); I != E; ++I) {
554 const NamedMDNode *NMD = I;
555 if (!StartedMetadataBlock) {
556 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
557 StartedMetadataBlock = true;
561 StringRef Str = NMD->getName();
562 for (unsigned i = 0, e = Str.size(); i != e; ++i)
563 Record.push_back(Str[i]);
564 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
567 // Write named metadata operands.
568 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
569 Record.push_back(VE.getValueID(NMD->getOperand(i)));
570 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
574 if (StartedMetadataBlock)
578 static void WriteFunctionLocalMetadata(const Function &F,
579 const ValueEnumerator &VE,
580 BitstreamWriter &Stream) {
581 bool StartedMetadataBlock = false;
582 SmallVector<uint64_t, 64> Record;
583 const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues();
584 for (unsigned i = 0, e = Vals.size(); i != e; ++i)
585 if (const MDNode *N = Vals[i])
586 if (N->isFunctionLocal() && N->getFunction() == &F) {
587 if (!StartedMetadataBlock) {
588 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
589 StartedMetadataBlock = true;
591 WriteMDNode(N, VE, Stream, Record);
594 if (StartedMetadataBlock)
598 static void WriteMetadataAttachment(const Function &F,
599 const ValueEnumerator &VE,
600 BitstreamWriter &Stream) {
601 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
603 SmallVector<uint64_t, 64> Record;
605 // Write metadata attachments
606 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
607 SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
609 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
610 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
613 I->getAllMetadataOtherThanDebugLoc(MDs);
615 // If no metadata, ignore instruction.
616 if (MDs.empty()) continue;
618 Record.push_back(VE.getInstructionID(I));
620 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
621 Record.push_back(MDs[i].first);
622 Record.push_back(VE.getValueID(MDs[i].second));
624 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
631 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
632 SmallVector<uint64_t, 64> Record;
634 // Write metadata kinds
635 // METADATA_KIND - [n x [id, name]]
636 SmallVector<StringRef, 4> Names;
637 M->getMDKindNames(Names);
639 if (Names.empty()) return;
641 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
643 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
644 Record.push_back(MDKindID);
645 StringRef KName = Names[MDKindID];
646 Record.append(KName.begin(), KName.end());
648 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
655 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
656 const ValueEnumerator &VE,
657 BitstreamWriter &Stream, bool isGlobal) {
658 if (FirstVal == LastVal) return;
660 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
662 unsigned AggregateAbbrev = 0;
663 unsigned String8Abbrev = 0;
664 unsigned CString7Abbrev = 0;
665 unsigned CString6Abbrev = 0;
666 // If this is a constant pool for the module, emit module-specific abbrevs.
668 // Abbrev for CST_CODE_AGGREGATE.
669 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
670 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
671 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
672 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
673 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
675 // Abbrev for CST_CODE_STRING.
676 Abbv = new BitCodeAbbrev();
677 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
678 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
679 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
680 String8Abbrev = Stream.EmitAbbrev(Abbv);
681 // Abbrev for CST_CODE_CSTRING.
682 Abbv = new BitCodeAbbrev();
683 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
684 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
685 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
686 CString7Abbrev = Stream.EmitAbbrev(Abbv);
687 // Abbrev for CST_CODE_CSTRING.
688 Abbv = new BitCodeAbbrev();
689 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
690 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
691 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
692 CString6Abbrev = Stream.EmitAbbrev(Abbv);
695 SmallVector<uint64_t, 64> Record;
697 const ValueEnumerator::ValueList &Vals = VE.getValues();
698 const Type *LastTy = 0;
699 for (unsigned i = FirstVal; i != LastVal; ++i) {
700 const Value *V = Vals[i].first;
701 // If we need to switch types, do so now.
702 if (V->getType() != LastTy) {
703 LastTy = V->getType();
704 Record.push_back(VE.getTypeID(LastTy));
705 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
706 CONSTANTS_SETTYPE_ABBREV);
710 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
711 Record.push_back(unsigned(IA->hasSideEffects()) |
712 unsigned(IA->isAlignStack()) << 1);
714 // Add the asm string.
715 const std::string &AsmStr = IA->getAsmString();
716 Record.push_back(AsmStr.size());
717 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
718 Record.push_back(AsmStr[i]);
720 // Add the constraint string.
721 const std::string &ConstraintStr = IA->getConstraintString();
722 Record.push_back(ConstraintStr.size());
723 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
724 Record.push_back(ConstraintStr[i]);
725 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
729 const Constant *C = cast<Constant>(V);
731 unsigned AbbrevToUse = 0;
732 if (C->isNullValue()) {
733 Code = bitc::CST_CODE_NULL;
734 } else if (isa<UndefValue>(C)) {
735 Code = bitc::CST_CODE_UNDEF;
736 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
737 if (IV->getBitWidth() <= 64) {
738 int64_t V = IV->getSExtValue();
740 Record.push_back(V << 1);
742 Record.push_back((-V << 1) | 1);
743 Code = bitc::CST_CODE_INTEGER;
744 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
745 } else { // Wide integers, > 64 bits in size.
746 // We have an arbitrary precision integer value to write whose
747 // bit width is > 64. However, in canonical unsigned integer
748 // format it is likely that the high bits are going to be zero.
749 // So, we only write the number of active words.
750 unsigned NWords = IV->getValue().getActiveWords();
751 const uint64_t *RawWords = IV->getValue().getRawData();
752 for (unsigned i = 0; i != NWords; ++i) {
753 int64_t V = RawWords[i];
755 Record.push_back(V << 1);
757 Record.push_back((-V << 1) | 1);
759 Code = bitc::CST_CODE_WIDE_INTEGER;
761 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
762 Code = bitc::CST_CODE_FLOAT;
763 const Type *Ty = CFP->getType();
764 if (Ty->isFloatTy() || Ty->isDoubleTy()) {
765 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
766 } else if (Ty->isX86_FP80Ty()) {
767 // api needed to prevent premature destruction
768 // bits are not in the same order as a normal i80 APInt, compensate.
769 APInt api = CFP->getValueAPF().bitcastToAPInt();
770 const uint64_t *p = api.getRawData();
771 Record.push_back((p[1] << 48) | (p[0] >> 16));
772 Record.push_back(p[0] & 0xffffLL);
773 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
774 APInt api = CFP->getValueAPF().bitcastToAPInt();
775 const uint64_t *p = api.getRawData();
776 Record.push_back(p[0]);
777 Record.push_back(p[1]);
779 assert (0 && "Unknown FP type!");
781 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
782 const ConstantArray *CA = cast<ConstantArray>(C);
783 // Emit constant strings specially.
784 unsigned NumOps = CA->getNumOperands();
785 // If this is a null-terminated string, use the denser CSTRING encoding.
786 if (CA->getOperand(NumOps-1)->isNullValue()) {
787 Code = bitc::CST_CODE_CSTRING;
788 --NumOps; // Don't encode the null, which isn't allowed by char6.
790 Code = bitc::CST_CODE_STRING;
791 AbbrevToUse = String8Abbrev;
793 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
794 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
795 for (unsigned i = 0; i != NumOps; ++i) {
796 unsigned char V = cast<ConstantInt>(CA->getOperand(i))->getZExtValue();
798 isCStr7 &= (V & 128) == 0;
800 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
804 AbbrevToUse = CString6Abbrev;
806 AbbrevToUse = CString7Abbrev;
807 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
808 isa<ConstantVector>(V)) {
809 Code = bitc::CST_CODE_AGGREGATE;
810 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
811 Record.push_back(VE.getValueID(C->getOperand(i)));
812 AbbrevToUse = AggregateAbbrev;
813 } else if (isa<ConstantUnion>(C)) {
814 Code = bitc::CST_CODE_AGGREGATE;
816 // Unions only have one entry but we must send type along with it.
817 const Type *EntryKind = C->getOperand(0)->getType();
819 const UnionType *UnTy = cast<UnionType>(C->getType());
820 int UnionIndex = UnTy->getElementTypeIndex(EntryKind);
821 assert(UnionIndex != -1 && "Constant union contains invalid entry");
823 Record.push_back(UnionIndex);
824 Record.push_back(VE.getValueID(C->getOperand(0)));
826 AbbrevToUse = AggregateAbbrev;
827 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
828 switch (CE->getOpcode()) {
830 if (Instruction::isCast(CE->getOpcode())) {
831 Code = bitc::CST_CODE_CE_CAST;
832 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
833 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
834 Record.push_back(VE.getValueID(C->getOperand(0)));
835 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
837 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
838 Code = bitc::CST_CODE_CE_BINOP;
839 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
840 Record.push_back(VE.getValueID(C->getOperand(0)));
841 Record.push_back(VE.getValueID(C->getOperand(1)));
842 uint64_t Flags = GetOptimizationFlags(CE);
844 Record.push_back(Flags);
847 case Instruction::GetElementPtr:
848 Code = bitc::CST_CODE_CE_GEP;
849 if (cast<GEPOperator>(C)->isInBounds())
850 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
851 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
852 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
853 Record.push_back(VE.getValueID(C->getOperand(i)));
856 case Instruction::Select:
857 Code = bitc::CST_CODE_CE_SELECT;
858 Record.push_back(VE.getValueID(C->getOperand(0)));
859 Record.push_back(VE.getValueID(C->getOperand(1)));
860 Record.push_back(VE.getValueID(C->getOperand(2)));
862 case Instruction::ExtractElement:
863 Code = bitc::CST_CODE_CE_EXTRACTELT;
864 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
865 Record.push_back(VE.getValueID(C->getOperand(0)));
866 Record.push_back(VE.getValueID(C->getOperand(1)));
868 case Instruction::InsertElement:
869 Code = bitc::CST_CODE_CE_INSERTELT;
870 Record.push_back(VE.getValueID(C->getOperand(0)));
871 Record.push_back(VE.getValueID(C->getOperand(1)));
872 Record.push_back(VE.getValueID(C->getOperand(2)));
874 case Instruction::ShuffleVector:
875 // If the return type and argument types are the same, this is a
876 // standard shufflevector instruction. If the types are different,
877 // then the shuffle is widening or truncating the input vectors, and
878 // the argument type must also be encoded.
879 if (C->getType() == C->getOperand(0)->getType()) {
880 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
882 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
883 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
885 Record.push_back(VE.getValueID(C->getOperand(0)));
886 Record.push_back(VE.getValueID(C->getOperand(1)));
887 Record.push_back(VE.getValueID(C->getOperand(2)));
889 case Instruction::ICmp:
890 case Instruction::FCmp:
891 Code = bitc::CST_CODE_CE_CMP;
892 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
893 Record.push_back(VE.getValueID(C->getOperand(0)));
894 Record.push_back(VE.getValueID(C->getOperand(1)));
895 Record.push_back(CE->getPredicate());
898 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
899 assert(BA->getFunction() == BA->getBasicBlock()->getParent() &&
900 "Malformed blockaddress");
901 Code = bitc::CST_CODE_BLOCKADDRESS;
902 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
903 Record.push_back(VE.getValueID(BA->getFunction()));
904 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.getTypeID(I.getOperand(0)->getType()));
1122 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1123 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
1126 case Instruction::Load:
1127 Code = bitc::FUNC_CODE_INST_LOAD;
1128 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1129 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1131 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1132 Vals.push_back(cast<LoadInst>(I).isVolatile());
1134 case Instruction::Store:
1135 Code = bitc::FUNC_CODE_INST_STORE2;
1136 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1137 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
1138 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1139 Vals.push_back(cast<StoreInst>(I).isVolatile());
1141 case Instruction::Call: {
1142 const CallInst &CI = cast<CallInst>(I);
1143 const PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
1144 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1146 Code = bitc::FUNC_CODE_INST_CALL;
1148 Vals.push_back(VE.getAttributeID(CI.getAttributes()));
1149 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()));
1150 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee
1152 // Emit value #'s for the fixed parameters.
1153 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1154 Vals.push_back(VE.getValueID(CI.getArgOperand(i))); // fixed param.
1156 // Emit type/value pairs for varargs params.
1157 if (FTy->isVarArg()) {
1158 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
1160 PushValueAndType(CI.getArgOperand(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 bool NeedsMetadataAttachment = false;
1263 // Finally, emit all the instructions, in order.
1264 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
1265 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
1267 WriteInstruction(*I, InstID, VE, Stream, Vals);
1269 if (!I->getType()->isVoidTy())
1272 // If the instruction has metadata, write a metadata attachment later.
1273 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
1275 // If the instruction has a debug location, emit it.
1276 DebugLoc DL = I->getDebugLoc();
1277 if (DL.isUnknown()) {
1279 } else if (DL == LastDL) {
1280 // Just repeat the same debug loc as last time.
1281 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
1284 DL.getScopeAndInlinedAt(Scope, IA, I->getContext());
1286 Vals.push_back(DL.getLine());
1287 Vals.push_back(DL.getCol());
1288 Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0);
1289 Vals.push_back(IA ? VE.getValueID(IA)+1 : 0);
1290 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
1297 // Emit names for all the instructions etc.
1298 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1300 if (NeedsMetadataAttachment)
1301 WriteMetadataAttachment(F, VE, Stream);
1306 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
1307 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
1308 const ValueEnumerator &VE,
1309 BitstreamWriter &Stream) {
1310 if (TST.empty()) return;
1312 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
1314 // 7-bit fixed width VST_CODE_ENTRY strings.
1315 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1316 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1317 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1318 Log2_32_Ceil(VE.getTypes().size()+1)));
1319 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1320 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1321 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
1323 SmallVector<unsigned, 64> NameVals;
1325 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1327 // TST_ENTRY: [typeid, namechar x N]
1328 NameVals.push_back(VE.getTypeID(TI->second));
1330 const std::string &Str = TI->first;
1332 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1333 NameVals.push_back((unsigned char)Str[i]);
1338 // Emit the finished record.
1339 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1346 // Emit blockinfo, which defines the standard abbreviations etc.
1347 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1348 // We only want to emit block info records for blocks that have multiple
1349 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1350 // blocks can defined their abbrevs inline.
1351 Stream.EnterBlockInfoBlock(2);
1353 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1354 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1355 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1357 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1358 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1359 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1360 Abbv) != VST_ENTRY_8_ABBREV)
1361 llvm_unreachable("Unexpected abbrev ordering!");
1364 { // 7-bit fixed width VST_ENTRY strings.
1365 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1366 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1367 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1368 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1369 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1370 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1371 Abbv) != VST_ENTRY_7_ABBREV)
1372 llvm_unreachable("Unexpected abbrev ordering!");
1374 { // 6-bit char6 VST_ENTRY strings.
1375 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1376 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1377 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1378 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1379 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1380 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1381 Abbv) != VST_ENTRY_6_ABBREV)
1382 llvm_unreachable("Unexpected abbrev ordering!");
1384 { // 6-bit char6 VST_BBENTRY strings.
1385 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1386 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1387 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1388 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1389 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1390 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1391 Abbv) != VST_BBENTRY_6_ABBREV)
1392 llvm_unreachable("Unexpected abbrev ordering!");
1397 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1398 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1399 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1400 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1401 Log2_32_Ceil(VE.getTypes().size()+1)));
1402 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1403 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1404 llvm_unreachable("Unexpected abbrev ordering!");
1407 { // INTEGER abbrev for CONSTANTS_BLOCK.
1408 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1409 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1410 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1411 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1412 Abbv) != CONSTANTS_INTEGER_ABBREV)
1413 llvm_unreachable("Unexpected abbrev ordering!");
1416 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1417 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1418 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1419 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1420 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1421 Log2_32_Ceil(VE.getTypes().size()+1)));
1422 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1424 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1425 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1426 llvm_unreachable("Unexpected abbrev ordering!");
1428 { // NULL abbrev for CONSTANTS_BLOCK.
1429 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1430 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1431 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1432 Abbv) != CONSTANTS_NULL_Abbrev)
1433 llvm_unreachable("Unexpected abbrev ordering!");
1436 // FIXME: This should only use space for first class types!
1438 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1439 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1440 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1441 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1442 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1443 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1444 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1445 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1446 llvm_unreachable("Unexpected abbrev ordering!");
1448 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1449 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1450 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1451 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1452 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1453 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1454 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1455 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1456 llvm_unreachable("Unexpected abbrev ordering!");
1458 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1459 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1460 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1461 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1462 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1463 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1464 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1465 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1466 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1467 llvm_unreachable("Unexpected abbrev ordering!");
1469 { // INST_CAST abbrev for FUNCTION_BLOCK.
1470 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1471 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1472 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1473 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1474 Log2_32_Ceil(VE.getTypes().size()+1)));
1475 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1476 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1477 Abbv) != FUNCTION_INST_CAST_ABBREV)
1478 llvm_unreachable("Unexpected abbrev ordering!");
1481 { // INST_RET abbrev for FUNCTION_BLOCK.
1482 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1483 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1484 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1485 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1486 llvm_unreachable("Unexpected abbrev ordering!");
1488 { // INST_RET abbrev for FUNCTION_BLOCK.
1489 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1490 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1491 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1492 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1493 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1494 llvm_unreachable("Unexpected abbrev ordering!");
1496 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1497 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1498 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1499 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1500 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1501 llvm_unreachable("Unexpected abbrev ordering!");
1508 /// WriteModule - Emit the specified module to the bitstream.
1509 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1510 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1512 // Emit the version number if it is non-zero.
1514 SmallVector<unsigned, 1> Vals;
1515 Vals.push_back(CurVersion);
1516 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1519 // Analyze the module, enumerating globals, functions, etc.
1520 ValueEnumerator VE(M);
1522 // Emit blockinfo, which defines the standard abbreviations etc.
1523 WriteBlockInfo(VE, Stream);
1525 // Emit information about parameter attributes.
1526 WriteAttributeTable(VE, Stream);
1528 // Emit information describing all of the types in the module.
1529 WriteTypeTable(VE, Stream);
1531 // Emit top-level description of module, including target triple, inline asm,
1532 // descriptors for global variables, and function prototype info.
1533 WriteModuleInfo(M, VE, Stream);
1536 WriteModuleConstants(VE, Stream);
1539 WriteModuleMetadata(M, VE, Stream);
1541 // Emit function bodies.
1542 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1543 if (!I->isDeclaration())
1544 WriteFunction(*I, VE, Stream);
1547 WriteModuleMetadataStore(M, Stream);
1549 // Emit the type symbol table information.
1550 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1552 // Emit names for globals/functions etc.
1553 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1558 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1559 /// header and trailer to make it compatible with the system archiver. To do
1560 /// this we emit the following header, and then emit a trailer that pads the
1561 /// file out to be a multiple of 16 bytes.
1563 /// struct bc_header {
1564 /// uint32_t Magic; // 0x0B17C0DE
1565 /// uint32_t Version; // Version, currently always 0.
1566 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1567 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1568 /// uint32_t CPUType; // CPU specifier.
1569 /// ... potentially more later ...
1572 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
1573 DarwinBCHeaderSize = 5*4
1576 /// isARMTriplet - Return true if the triplet looks like:
1577 /// arm-*, thumb-*, armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*.
1578 static bool isARMTriplet(const std::string &TT) {
1580 size_t Size = TT.size();
1582 TT[0] == 't' && TT[1] == 'h' && TT[2] == 'u' &&
1583 TT[3] == 'm' && TT[4] == 'b')
1585 else if (Size >= 4 && TT[0] == 'a' && TT[1] == 'r' && TT[2] == 'm')
1592 else if (TT[Pos] == 'v') {
1593 if (Size >= Pos+4 &&
1594 TT[Pos+1] == '6' && TT[Pos+2] == 't' && TT[Pos+3] == '2')
1596 else if (Size >= Pos+4 &&
1597 TT[Pos+1] == '5' && TT[Pos+2] == 't' && TT[Pos+3] == 'e')
1601 while (++Pos < Size && TT[Pos] != '-') {
1602 if (!isdigit(TT[Pos]))
1608 static void EmitDarwinBCHeader(BitstreamWriter &Stream,
1609 const std::string &TT) {
1610 unsigned CPUType = ~0U;
1612 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
1613 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
1614 // number from /usr/include/mach/machine.h. It is ok to reproduce the
1615 // specific constants here because they are implicitly part of the Darwin ABI.
1617 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
1618 DARWIN_CPU_TYPE_X86 = 7,
1619 DARWIN_CPU_TYPE_ARM = 12,
1620 DARWIN_CPU_TYPE_POWERPC = 18
1623 if (TT.find("x86_64-") == 0)
1624 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
1625 else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' &&
1626 TT[4] == '-' && TT[1] - '3' < 6)
1627 CPUType = DARWIN_CPU_TYPE_X86;
1628 else if (TT.find("powerpc-") == 0)
1629 CPUType = DARWIN_CPU_TYPE_POWERPC;
1630 else if (TT.find("powerpc64-") == 0)
1631 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
1632 else if (isARMTriplet(TT))
1633 CPUType = DARWIN_CPU_TYPE_ARM;
1635 // Traditional Bitcode starts after header.
1636 unsigned BCOffset = DarwinBCHeaderSize;
1638 Stream.Emit(0x0B17C0DE, 32);
1639 Stream.Emit(0 , 32); // Version.
1640 Stream.Emit(BCOffset , 32);
1641 Stream.Emit(0 , 32); // Filled in later.
1642 Stream.Emit(CPUType , 32);
1645 /// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and
1646 /// finalize the header.
1647 static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) {
1648 // Update the size field in the header.
1649 Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize);
1651 // If the file is not a multiple of 16 bytes, insert dummy padding.
1652 while (BufferSize & 15) {
1659 /// WriteBitcodeToFile - Write the specified module to the specified output
1661 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
1662 std::vector<unsigned char> Buffer;
1663 BitstreamWriter Stream(Buffer);
1665 Buffer.reserve(256*1024);
1667 WriteBitcodeToStream( M, Stream );
1669 // Write the generated bitstream to "Out".
1670 Out.write((char*)&Buffer.front(), Buffer.size());
1673 /// WriteBitcodeToStream - Write the specified module to the specified output
1675 void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) {
1676 // If this is darwin, emit a file header and trailer if needed.
1677 bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos;
1679 EmitDarwinBCHeader(Stream, M->getTargetTriple());
1681 // Emit the file header.
1682 Stream.Emit((unsigned)'B', 8);
1683 Stream.Emit((unsigned)'C', 8);
1684 Stream.Emit(0x0, 4);
1685 Stream.Emit(0xC, 4);
1686 Stream.Emit(0xE, 4);
1687 Stream.Emit(0xD, 4);
1690 WriteModule(M, Stream);
1693 EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());