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/TypeSymbolTable.h"
24 #include "llvm/ValueSymbolTable.h"
25 #include "llvm/Support/MathExtras.h"
28 /// These are manifest constants used by the bitcode writer. They do not need to
29 /// be kept in sync with the reader, but need to be consistent within this file.
33 // VALUE_SYMTAB_BLOCK abbrev id's.
34 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
39 // CONSTANTS_BLOCK abbrev id's.
40 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
41 CONSTANTS_INTEGER_ABBREV,
42 CONSTANTS_CE_CAST_Abbrev,
43 CONSTANTS_NULL_Abbrev,
45 // FUNCTION_BLOCK abbrev id's.
46 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
47 FUNCTION_INST_BINOP_ABBREV,
48 FUNCTION_INST_CAST_ABBREV,
49 FUNCTION_INST_RET_VOID_ABBREV,
50 FUNCTION_INST_RET_VAL_ABBREV,
51 FUNCTION_INST_UNREACHABLE_ABBREV
55 static unsigned GetEncodedCastOpcode(unsigned Opcode) {
57 default: assert(0 && "Unknown cast instruction!");
58 case Instruction::Trunc : return bitc::CAST_TRUNC;
59 case Instruction::ZExt : return bitc::CAST_ZEXT;
60 case Instruction::SExt : return bitc::CAST_SEXT;
61 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
62 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
63 case Instruction::UIToFP : return bitc::CAST_UITOFP;
64 case Instruction::SIToFP : return bitc::CAST_SITOFP;
65 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
66 case Instruction::FPExt : return bitc::CAST_FPEXT;
67 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
68 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
69 case Instruction::BitCast : return bitc::CAST_BITCAST;
73 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) {
75 default: assert(0 && "Unknown binary instruction!");
76 case Instruction::Add: return bitc::BINOP_ADD;
77 case Instruction::Sub: return bitc::BINOP_SUB;
78 case Instruction::Mul: return bitc::BINOP_MUL;
79 case Instruction::UDiv: return bitc::BINOP_UDIV;
80 case Instruction::FDiv:
81 case Instruction::SDiv: return bitc::BINOP_SDIV;
82 case Instruction::URem: return bitc::BINOP_UREM;
83 case Instruction::FRem:
84 case Instruction::SRem: return bitc::BINOP_SREM;
85 case Instruction::Shl: return bitc::BINOP_SHL;
86 case Instruction::LShr: return bitc::BINOP_LSHR;
87 case Instruction::AShr: return bitc::BINOP_ASHR;
88 case Instruction::And: return bitc::BINOP_AND;
89 case Instruction::Or: return bitc::BINOP_OR;
90 case Instruction::Xor: return bitc::BINOP_XOR;
96 static void WriteStringRecord(unsigned Code, const std::string &Str,
97 unsigned AbbrevToUse, BitstreamWriter &Stream) {
98 SmallVector<unsigned, 64> Vals;
100 // Code: [strchar x N]
101 for (unsigned i = 0, e = Str.size(); i != e; ++i)
102 Vals.push_back(Str[i]);
104 // Emit the finished record.
105 Stream.EmitRecord(Code, Vals, AbbrevToUse);
108 // Emit information about parameter attributes.
109 static void WriteParamAttrTable(const ValueEnumerator &VE,
110 BitstreamWriter &Stream) {
111 const std::vector<PAListPtr> &Attrs = VE.getParamAttrs();
112 if (Attrs.empty()) return;
114 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
116 SmallVector<uint64_t, 64> Record;
117 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
118 const PAListPtr &A = Attrs[i];
119 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) {
120 const ParamAttrsWithIndex &PAWI = A.getSlot(i);
121 Record.push_back(PAWI.Index);
122 Record.push_back(PAWI.Attrs);
125 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
132 /// WriteTypeTable - Write out the type table for a module.
133 static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
134 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
136 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */);
137 SmallVector<uint64_t, 64> TypeVals;
139 // Abbrev for TYPE_CODE_POINTER.
140 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
141 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
142 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
143 Log2_32_Ceil(VE.getTypes().size()+1)));
144 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
145 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
147 // Abbrev for TYPE_CODE_FUNCTION.
148 Abbv = new BitCodeAbbrev();
149 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
150 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
151 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0
152 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
153 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
154 Log2_32_Ceil(VE.getTypes().size()+1)));
155 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
157 // Abbrev for TYPE_CODE_STRUCT.
158 Abbv = new BitCodeAbbrev();
159 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT));
160 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
161 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
162 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
163 Log2_32_Ceil(VE.getTypes().size()+1)));
164 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv);
166 // Abbrev for TYPE_CODE_ARRAY.
167 Abbv = new BitCodeAbbrev();
168 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
169 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
170 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
171 Log2_32_Ceil(VE.getTypes().size()+1)));
172 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
174 // Emit an entry count so the reader can reserve space.
175 TypeVals.push_back(TypeList.size());
176 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
179 // Loop over all of the types, emitting each in turn.
180 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
181 const Type *T = TypeList[i].first;
185 switch (T->getTypeID()) {
186 default: assert(0 && "Unknown type!");
187 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
188 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
189 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
190 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
191 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
192 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
193 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
194 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break;
195 case Type::IntegerTyID:
197 Code = bitc::TYPE_CODE_INTEGER;
198 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
200 case Type::PointerTyID: {
201 const PointerType *PTy = cast<PointerType>(T);
202 // POINTER: [pointee type, address space]
203 Code = bitc::TYPE_CODE_POINTER;
204 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
205 unsigned AddressSpace = PTy->getAddressSpace();
206 TypeVals.push_back(AddressSpace);
207 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
210 case Type::FunctionTyID: {
211 const FunctionType *FT = cast<FunctionType>(T);
212 // FUNCTION: [isvararg, attrid, retty, paramty x N]
213 Code = bitc::TYPE_CODE_FUNCTION;
214 TypeVals.push_back(FT->isVarArg());
215 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0
216 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
217 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
218 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
219 AbbrevToUse = FunctionAbbrev;
222 case Type::StructTyID: {
223 const StructType *ST = cast<StructType>(T);
224 // STRUCT: [ispacked, eltty x N]
225 Code = bitc::TYPE_CODE_STRUCT;
226 TypeVals.push_back(ST->isPacked());
227 // Output all of the element types.
228 for (StructType::element_iterator I = ST->element_begin(),
229 E = ST->element_end(); I != E; ++I)
230 TypeVals.push_back(VE.getTypeID(*I));
231 AbbrevToUse = StructAbbrev;
234 case Type::ArrayTyID: {
235 const ArrayType *AT = cast<ArrayType>(T);
236 // ARRAY: [numelts, eltty]
237 Code = bitc::TYPE_CODE_ARRAY;
238 TypeVals.push_back(AT->getNumElements());
239 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
240 AbbrevToUse = ArrayAbbrev;
243 case Type::VectorTyID: {
244 const VectorType *VT = cast<VectorType>(T);
245 // VECTOR [numelts, eltty]
246 Code = bitc::TYPE_CODE_VECTOR;
247 TypeVals.push_back(VT->getNumElements());
248 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
253 // Emit the finished record.
254 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
261 static unsigned getEncodedLinkage(const GlobalValue *GV) {
262 switch (GV->getLinkage()) {
263 default: assert(0 && "Invalid linkage!");
264 case GlobalValue::GhostLinkage: // Map ghost linkage onto external.
265 case GlobalValue::ExternalLinkage: return 0;
266 case GlobalValue::WeakLinkage: return 1;
267 case GlobalValue::AppendingLinkage: return 2;
268 case GlobalValue::InternalLinkage: return 3;
269 case GlobalValue::LinkOnceLinkage: return 4;
270 case GlobalValue::DLLImportLinkage: return 5;
271 case GlobalValue::DLLExportLinkage: return 6;
272 case GlobalValue::ExternalWeakLinkage: return 7;
276 static unsigned getEncodedVisibility(const GlobalValue *GV) {
277 switch (GV->getVisibility()) {
278 default: assert(0 && "Invalid visibility!");
279 case GlobalValue::DefaultVisibility: return 0;
280 case GlobalValue::HiddenVisibility: return 1;
281 case GlobalValue::ProtectedVisibility: return 2;
285 // Emit top-level description of module, including target triple, inline asm,
286 // descriptors for global variables, and function prototype info.
287 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
288 BitstreamWriter &Stream) {
289 // Emit the list of dependent libraries for the Module.
290 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
291 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
293 // Emit various pieces of data attached to a module.
294 if (!M->getTargetTriple().empty())
295 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
297 if (!M->getDataLayout().empty())
298 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
300 if (!M->getModuleInlineAsm().empty())
301 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
304 // Emit information about sections and collectors, computing how many there
305 // are. Also compute the maximum alignment value.
306 std::map<std::string, unsigned> SectionMap;
307 std::map<std::string, unsigned> CollectorMap;
308 unsigned MaxAlignment = 0;
309 unsigned MaxGlobalType = 0;
310 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
312 MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
313 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
315 if (!GV->hasSection()) continue;
316 // Give section names unique ID's.
317 unsigned &Entry = SectionMap[GV->getSection()];
318 if (Entry != 0) continue;
319 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
321 Entry = SectionMap.size();
323 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
324 MaxAlignment = std::max(MaxAlignment, F->getAlignment());
325 if (F->hasSection()) {
326 // Give section names unique ID's.
327 unsigned &Entry = SectionMap[F->getSection()];
329 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
331 Entry = SectionMap.size();
334 if (F->hasCollector()) {
335 // Same for collector names.
336 unsigned &Entry = CollectorMap[F->getCollector()];
338 WriteStringRecord(bitc::MODULE_CODE_COLLECTORNAME, F->getCollector(),
340 Entry = CollectorMap.size();
345 // Emit abbrev for globals, now that we know # sections and max alignment.
346 unsigned SimpleGVarAbbrev = 0;
347 if (!M->global_empty()) {
348 // Add an abbrev for common globals with no visibility or thread localness.
349 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
350 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
351 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
352 Log2_32_Ceil(MaxGlobalType+1)));
353 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
354 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
355 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage.
356 if (MaxAlignment == 0) // Alignment.
357 Abbv->Add(BitCodeAbbrevOp(0));
359 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
360 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
361 Log2_32_Ceil(MaxEncAlignment+1)));
363 if (SectionMap.empty()) // Section.
364 Abbv->Add(BitCodeAbbrevOp(0));
366 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
367 Log2_32_Ceil(SectionMap.size()+1)));
368 // Don't bother emitting vis + thread local.
369 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
372 // Emit the global variable information.
373 SmallVector<unsigned, 64> Vals;
374 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
376 unsigned AbbrevToUse = 0;
378 // GLOBALVAR: [type, isconst, initid,
379 // linkage, alignment, section, visibility, threadlocal]
380 Vals.push_back(VE.getTypeID(GV->getType()));
381 Vals.push_back(GV->isConstant());
382 Vals.push_back(GV->isDeclaration() ? 0 :
383 (VE.getValueID(GV->getInitializer()) + 1));
384 Vals.push_back(getEncodedLinkage(GV));
385 Vals.push_back(Log2_32(GV->getAlignment())+1);
386 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
387 if (GV->isThreadLocal() ||
388 GV->getVisibility() != GlobalValue::DefaultVisibility) {
389 Vals.push_back(getEncodedVisibility(GV));
390 Vals.push_back(GV->isThreadLocal());
392 AbbrevToUse = SimpleGVarAbbrev;
395 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
399 // Emit the function proto information.
400 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
401 // FUNCTION: [type, callingconv, isproto, paramattr,
402 // linkage, alignment, section, visibility, collector]
403 Vals.push_back(VE.getTypeID(F->getType()));
404 Vals.push_back(F->getCallingConv());
405 Vals.push_back(F->isDeclaration());
406 Vals.push_back(getEncodedLinkage(F));
407 Vals.push_back(VE.getParamAttrID(F->getParamAttrs()));
408 Vals.push_back(Log2_32(F->getAlignment())+1);
409 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
410 Vals.push_back(getEncodedVisibility(F));
411 Vals.push_back(F->hasCollector() ? CollectorMap[F->getCollector()] : 0);
413 unsigned AbbrevToUse = 0;
414 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
419 // Emit the alias information.
420 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
422 Vals.push_back(VE.getTypeID(AI->getType()));
423 Vals.push_back(VE.getValueID(AI->getAliasee()));
424 Vals.push_back(getEncodedLinkage(AI));
425 Vals.push_back(getEncodedVisibility(AI));
426 unsigned AbbrevToUse = 0;
427 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
433 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
434 const ValueEnumerator &VE,
435 BitstreamWriter &Stream, bool isGlobal) {
436 if (FirstVal == LastVal) return;
438 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
440 unsigned AggregateAbbrev = 0;
441 unsigned String8Abbrev = 0;
442 unsigned CString7Abbrev = 0;
443 unsigned CString6Abbrev = 0;
444 // If this is a constant pool for the module, emit module-specific abbrevs.
446 // Abbrev for CST_CODE_AGGREGATE.
447 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
448 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
449 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
450 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
451 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
453 // Abbrev for CST_CODE_STRING.
454 Abbv = new BitCodeAbbrev();
455 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
456 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
457 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
458 String8Abbrev = Stream.EmitAbbrev(Abbv);
459 // Abbrev for CST_CODE_CSTRING.
460 Abbv = new BitCodeAbbrev();
461 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
462 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
463 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
464 CString7Abbrev = Stream.EmitAbbrev(Abbv);
465 // Abbrev for CST_CODE_CSTRING.
466 Abbv = new BitCodeAbbrev();
467 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
468 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
469 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
470 CString6Abbrev = Stream.EmitAbbrev(Abbv);
473 SmallVector<uint64_t, 64> Record;
475 const ValueEnumerator::ValueList &Vals = VE.getValues();
476 const Type *LastTy = 0;
477 for (unsigned i = FirstVal; i != LastVal; ++i) {
478 const Value *V = Vals[i].first;
479 // If we need to switch types, do so now.
480 if (V->getType() != LastTy) {
481 LastTy = V->getType();
482 Record.push_back(VE.getTypeID(LastTy));
483 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
484 CONSTANTS_SETTYPE_ABBREV);
488 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
489 Record.push_back(unsigned(IA->hasSideEffects()));
491 // Add the asm string.
492 const std::string &AsmStr = IA->getAsmString();
493 Record.push_back(AsmStr.size());
494 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
495 Record.push_back(AsmStr[i]);
497 // Add the constraint string.
498 const std::string &ConstraintStr = IA->getConstraintString();
499 Record.push_back(ConstraintStr.size());
500 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
501 Record.push_back(ConstraintStr[i]);
502 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
506 const Constant *C = cast<Constant>(V);
508 unsigned AbbrevToUse = 0;
509 if (C->isNullValue()) {
510 Code = bitc::CST_CODE_NULL;
511 } else if (isa<UndefValue>(C)) {
512 Code = bitc::CST_CODE_UNDEF;
513 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
514 if (IV->getBitWidth() <= 64) {
515 int64_t V = IV->getSExtValue();
517 Record.push_back(V << 1);
519 Record.push_back((-V << 1) | 1);
520 Code = bitc::CST_CODE_INTEGER;
521 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
522 } else { // Wide integers, > 64 bits in size.
523 // We have an arbitrary precision integer value to write whose
524 // bit width is > 64. However, in canonical unsigned integer
525 // format it is likely that the high bits are going to be zero.
526 // So, we only write the number of active words.
527 unsigned NWords = IV->getValue().getActiveWords();
528 const uint64_t *RawWords = IV->getValue().getRawData();
529 for (unsigned i = 0; i != NWords; ++i) {
530 int64_t V = RawWords[i];
532 Record.push_back(V << 1);
534 Record.push_back((-V << 1) | 1);
536 Code = bitc::CST_CODE_WIDE_INTEGER;
538 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
539 Code = bitc::CST_CODE_FLOAT;
540 const Type *Ty = CFP->getType();
541 if (Ty == Type::FloatTy || Ty == Type::DoubleTy) {
542 Record.push_back(CFP->getValueAPF().convertToAPInt().getZExtValue());
543 } else if (Ty == Type::X86_FP80Ty) {
544 // api needed to prevent premature destruction
545 APInt api = CFP->getValueAPF().convertToAPInt();
546 const uint64_t *p = api.getRawData();
547 Record.push_back(p[0]);
548 Record.push_back((uint16_t)p[1]);
549 } else if (Ty == Type::FP128Ty || Ty == Type::PPC_FP128Ty) {
550 APInt api = CFP->getValueAPF().convertToAPInt();
551 const uint64_t *p = api.getRawData();
552 Record.push_back(p[0]);
553 Record.push_back(p[1]);
555 assert (0 && "Unknown FP type!");
557 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
558 // Emit constant strings specially.
559 unsigned NumOps = C->getNumOperands();
560 // If this is a null-terminated string, use the denser CSTRING encoding.
561 if (C->getOperand(NumOps-1)->isNullValue()) {
562 Code = bitc::CST_CODE_CSTRING;
563 --NumOps; // Don't encode the null, which isn't allowed by char6.
565 Code = bitc::CST_CODE_STRING;
566 AbbrevToUse = String8Abbrev;
568 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
569 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
570 for (unsigned i = 0; i != NumOps; ++i) {
571 unsigned char V = cast<ConstantInt>(C->getOperand(i))->getZExtValue();
573 isCStr7 &= (V & 128) == 0;
575 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
579 AbbrevToUse = CString6Abbrev;
581 AbbrevToUse = CString7Abbrev;
582 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
583 isa<ConstantVector>(V)) {
584 Code = bitc::CST_CODE_AGGREGATE;
585 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
586 Record.push_back(VE.getValueID(C->getOperand(i)));
587 AbbrevToUse = AggregateAbbrev;
588 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
589 switch (CE->getOpcode()) {
591 if (Instruction::isCast(CE->getOpcode())) {
592 Code = bitc::CST_CODE_CE_CAST;
593 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
594 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
595 Record.push_back(VE.getValueID(C->getOperand(0)));
596 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
598 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
599 Code = bitc::CST_CODE_CE_BINOP;
600 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
601 Record.push_back(VE.getValueID(C->getOperand(0)));
602 Record.push_back(VE.getValueID(C->getOperand(1)));
605 case Instruction::GetElementPtr:
606 Code = bitc::CST_CODE_CE_GEP;
607 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
608 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
609 Record.push_back(VE.getValueID(C->getOperand(i)));
612 case Instruction::Select:
613 Code = bitc::CST_CODE_CE_SELECT;
614 Record.push_back(VE.getValueID(C->getOperand(0)));
615 Record.push_back(VE.getValueID(C->getOperand(1)));
616 Record.push_back(VE.getValueID(C->getOperand(2)));
618 case Instruction::ExtractElement:
619 Code = bitc::CST_CODE_CE_EXTRACTELT;
620 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
621 Record.push_back(VE.getValueID(C->getOperand(0)));
622 Record.push_back(VE.getValueID(C->getOperand(1)));
624 case Instruction::InsertElement:
625 Code = bitc::CST_CODE_CE_INSERTELT;
626 Record.push_back(VE.getValueID(C->getOperand(0)));
627 Record.push_back(VE.getValueID(C->getOperand(1)));
628 Record.push_back(VE.getValueID(C->getOperand(2)));
630 case Instruction::ShuffleVector:
631 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
632 Record.push_back(VE.getValueID(C->getOperand(0)));
633 Record.push_back(VE.getValueID(C->getOperand(1)));
634 Record.push_back(VE.getValueID(C->getOperand(2)));
636 case Instruction::ICmp:
637 case Instruction::FCmp:
638 case Instruction::VICmp:
639 case Instruction::VFCmp:
640 Code = bitc::CST_CODE_CE_CMP;
641 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
642 Record.push_back(VE.getValueID(C->getOperand(0)));
643 Record.push_back(VE.getValueID(C->getOperand(1)));
644 Record.push_back(CE->getPredicate());
648 assert(0 && "Unknown constant!");
650 Stream.EmitRecord(Code, Record, AbbrevToUse);
657 static void WriteModuleConstants(const ValueEnumerator &VE,
658 BitstreamWriter &Stream) {
659 const ValueEnumerator::ValueList &Vals = VE.getValues();
661 // Find the first constant to emit, which is the first non-globalvalue value.
662 // We know globalvalues have been emitted by WriteModuleInfo.
663 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
664 if (!isa<GlobalValue>(Vals[i].first)) {
665 WriteConstants(i, Vals.size(), VE, Stream, true);
671 /// PushValueAndType - The file has to encode both the value and type id for
672 /// many values, because we need to know what type to create for forward
673 /// references. However, most operands are not forward references, so this type
674 /// field is not needed.
676 /// This function adds V's value ID to Vals. If the value ID is higher than the
677 /// instruction ID, then it is a forward reference, and it also includes the
679 static bool PushValueAndType(Value *V, unsigned InstID,
680 SmallVector<unsigned, 64> &Vals,
681 ValueEnumerator &VE) {
682 unsigned ValID = VE.getValueID(V);
683 Vals.push_back(ValID);
684 if (ValID >= InstID) {
685 Vals.push_back(VE.getTypeID(V->getType()));
691 /// WriteInstruction - Emit an instruction to the specified stream.
692 static void WriteInstruction(const Instruction &I, unsigned InstID,
693 ValueEnumerator &VE, BitstreamWriter &Stream,
694 SmallVector<unsigned, 64> &Vals) {
696 unsigned AbbrevToUse = 0;
697 switch (I.getOpcode()) {
699 if (Instruction::isCast(I.getOpcode())) {
700 Code = bitc::FUNC_CODE_INST_CAST;
701 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
702 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
703 Vals.push_back(VE.getTypeID(I.getType()));
704 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
706 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
707 Code = bitc::FUNC_CODE_INST_BINOP;
708 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
709 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
710 Vals.push_back(VE.getValueID(I.getOperand(1)));
711 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
715 case Instruction::GetElementPtr:
716 Code = bitc::FUNC_CODE_INST_GEP;
717 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
718 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
720 case Instruction::Select:
721 Code = bitc::FUNC_CODE_INST_SELECT;
722 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
723 Vals.push_back(VE.getValueID(I.getOperand(2)));
724 Vals.push_back(VE.getValueID(I.getOperand(0)));
726 case Instruction::ExtractElement:
727 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
728 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
729 Vals.push_back(VE.getValueID(I.getOperand(1)));
731 case Instruction::InsertElement:
732 Code = bitc::FUNC_CODE_INST_INSERTELT;
733 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
734 Vals.push_back(VE.getValueID(I.getOperand(1)));
735 Vals.push_back(VE.getValueID(I.getOperand(2)));
737 case Instruction::ShuffleVector:
738 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
739 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
740 Vals.push_back(VE.getValueID(I.getOperand(1)));
741 Vals.push_back(VE.getValueID(I.getOperand(2)));
743 case Instruction::ICmp:
744 case Instruction::FCmp:
745 case Instruction::VICmp:
746 case Instruction::VFCmp:
747 Code = bitc::FUNC_CODE_INST_CMP;
748 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
749 Vals.push_back(VE.getValueID(I.getOperand(1)));
750 Vals.push_back(cast<CmpInst>(I).getPredicate());
752 case Instruction::GetResult:
753 Code = bitc::FUNC_CODE_INST_GETRESULT;
754 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
755 Vals.push_back(cast<GetResultInst>(I).getIndex());
758 case Instruction::Ret:
760 Code = bitc::FUNC_CODE_INST_RET;
761 unsigned NumOperands = I.getNumOperands();
762 if (NumOperands == 0)
763 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
764 else if (NumOperands == 1) {
765 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
766 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
768 for (unsigned i = 0, e = NumOperands; i != e; ++i)
769 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
773 case Instruction::Br:
774 Code = bitc::FUNC_CODE_INST_BR;
775 Vals.push_back(VE.getValueID(I.getOperand(0)));
776 if (cast<BranchInst>(I).isConditional()) {
777 Vals.push_back(VE.getValueID(I.getOperand(1)));
778 Vals.push_back(VE.getValueID(I.getOperand(2)));
781 case Instruction::Switch:
782 Code = bitc::FUNC_CODE_INST_SWITCH;
783 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
784 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
785 Vals.push_back(VE.getValueID(I.getOperand(i)));
787 case Instruction::Invoke: {
788 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
789 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
790 Code = bitc::FUNC_CODE_INST_INVOKE;
792 const InvokeInst *II = cast<InvokeInst>(&I);
793 Vals.push_back(VE.getParamAttrID(II->getParamAttrs()));
794 Vals.push_back(II->getCallingConv());
795 Vals.push_back(VE.getValueID(I.getOperand(1))); // normal dest
796 Vals.push_back(VE.getValueID(I.getOperand(2))); // unwind dest
797 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // callee
799 // Emit value #'s for the fixed parameters.
800 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
801 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param.
803 // Emit type/value pairs for varargs params.
804 if (FTy->isVarArg()) {
805 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands();
807 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
811 case Instruction::Unwind:
812 Code = bitc::FUNC_CODE_INST_UNWIND;
814 case Instruction::Unreachable:
815 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
816 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
819 case Instruction::PHI:
820 Code = bitc::FUNC_CODE_INST_PHI;
821 Vals.push_back(VE.getTypeID(I.getType()));
822 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
823 Vals.push_back(VE.getValueID(I.getOperand(i)));
826 case Instruction::Malloc:
827 Code = bitc::FUNC_CODE_INST_MALLOC;
828 Vals.push_back(VE.getTypeID(I.getType()));
829 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
830 Vals.push_back(Log2_32(cast<MallocInst>(I).getAlignment())+1);
833 case Instruction::Free:
834 Code = bitc::FUNC_CODE_INST_FREE;
835 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
838 case Instruction::Alloca:
839 Code = bitc::FUNC_CODE_INST_ALLOCA;
840 Vals.push_back(VE.getTypeID(I.getType()));
841 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
842 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
845 case Instruction::Load:
846 Code = bitc::FUNC_CODE_INST_LOAD;
847 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
848 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
850 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
851 Vals.push_back(cast<LoadInst>(I).isVolatile());
853 case Instruction::Store:
854 Code = bitc::FUNC_CODE_INST_STORE2;
855 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
856 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
857 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
858 Vals.push_back(cast<StoreInst>(I).isVolatile());
860 case Instruction::Call: {
861 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
862 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
864 Code = bitc::FUNC_CODE_INST_CALL;
866 const CallInst *CI = cast<CallInst>(&I);
867 Vals.push_back(VE.getParamAttrID(CI->getParamAttrs()));
868 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall()));
869 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee
871 // Emit value #'s for the fixed parameters.
872 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
873 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param.
875 // Emit type/value pairs for varargs params.
876 if (FTy->isVarArg()) {
877 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams();
878 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands();
880 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs
884 case Instruction::VAArg:
885 Code = bitc::FUNC_CODE_INST_VAARG;
886 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
887 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
888 Vals.push_back(VE.getTypeID(I.getType())); // restype.
892 Stream.EmitRecord(Code, Vals, AbbrevToUse);
896 // Emit names for globals/functions etc.
897 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
898 const ValueEnumerator &VE,
899 BitstreamWriter &Stream) {
900 if (VST.empty()) return;
901 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
903 // FIXME: Set up the abbrev, we know how many values there are!
904 // FIXME: We know if the type names can use 7-bit ascii.
905 SmallVector<unsigned, 64> NameVals;
907 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
910 const ValueName &Name = *SI;
912 // Figure out the encoding to use for the name.
915 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
918 isChar6 = BitCodeAbbrevOp::isChar6(*C);
919 if ((unsigned char)*C & 128) {
921 break; // don't bother scanning the rest.
925 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
927 // VST_ENTRY: [valueid, namechar x N]
928 // VST_BBENTRY: [bbid, namechar x N]
930 if (isa<BasicBlock>(SI->getValue())) {
931 Code = bitc::VST_CODE_BBENTRY;
933 AbbrevToUse = VST_BBENTRY_6_ABBREV;
935 Code = bitc::VST_CODE_ENTRY;
937 AbbrevToUse = VST_ENTRY_6_ABBREV;
939 AbbrevToUse = VST_ENTRY_7_ABBREV;
942 NameVals.push_back(VE.getValueID(SI->getValue()));
943 for (const char *P = Name.getKeyData(),
944 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
945 NameVals.push_back((unsigned char)*P);
947 // Emit the finished record.
948 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
954 /// WriteFunction - Emit a function body to the module stream.
955 static void WriteFunction(const Function &F, ValueEnumerator &VE,
956 BitstreamWriter &Stream) {
957 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
958 VE.incorporateFunction(F);
960 SmallVector<unsigned, 64> Vals;
962 // Emit the number of basic blocks, so the reader can create them ahead of
964 Vals.push_back(VE.getBasicBlocks().size());
965 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
968 // If there are function-local constants, emit them now.
969 unsigned CstStart, CstEnd;
970 VE.getFunctionConstantRange(CstStart, CstEnd);
971 WriteConstants(CstStart, CstEnd, VE, Stream, false);
973 // Keep a running idea of what the instruction ID is.
974 unsigned InstID = CstEnd;
976 // Finally, emit all the instructions, in order.
977 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
978 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
980 WriteInstruction(*I, InstID, VE, Stream, Vals);
981 if (I->getType() != Type::VoidTy)
985 // Emit names for all the instructions etc.
986 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
992 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
993 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
994 const ValueEnumerator &VE,
995 BitstreamWriter &Stream) {
996 if (TST.empty()) return;
998 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
1000 // 7-bit fixed width VST_CODE_ENTRY strings.
1001 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1002 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1003 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1004 Log2_32_Ceil(VE.getTypes().size()+1)));
1005 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1006 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1007 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
1009 SmallVector<unsigned, 64> NameVals;
1011 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1013 // TST_ENTRY: [typeid, namechar x N]
1014 NameVals.push_back(VE.getTypeID(TI->second));
1016 const std::string &Str = TI->first;
1018 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1019 NameVals.push_back((unsigned char)Str[i]);
1024 // Emit the finished record.
1025 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1032 // Emit blockinfo, which defines the standard abbreviations etc.
1033 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1034 // We only want to emit block info records for blocks that have multiple
1035 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1036 // blocks can defined their abbrevs inline.
1037 Stream.EnterBlockInfoBlock(2);
1039 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1040 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1041 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1042 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1043 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1044 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1045 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1046 Abbv) != VST_ENTRY_8_ABBREV)
1047 assert(0 && "Unexpected abbrev ordering!");
1050 { // 7-bit fixed width VST_ENTRY strings.
1051 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1052 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1053 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1054 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1055 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1056 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1057 Abbv) != VST_ENTRY_7_ABBREV)
1058 assert(0 && "Unexpected abbrev ordering!");
1060 { // 6-bit char6 VST_ENTRY strings.
1061 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1062 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1063 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1064 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1065 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1066 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1067 Abbv) != VST_ENTRY_6_ABBREV)
1068 assert(0 && "Unexpected abbrev ordering!");
1070 { // 6-bit char6 VST_BBENTRY strings.
1071 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1072 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1073 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1074 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1075 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1076 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1077 Abbv) != VST_BBENTRY_6_ABBREV)
1078 assert(0 && "Unexpected abbrev ordering!");
1083 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1084 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1085 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1086 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1087 Log2_32_Ceil(VE.getTypes().size()+1)));
1088 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1089 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1090 assert(0 && "Unexpected abbrev ordering!");
1093 { // INTEGER abbrev for CONSTANTS_BLOCK.
1094 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1095 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1096 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1097 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1098 Abbv) != CONSTANTS_INTEGER_ABBREV)
1099 assert(0 && "Unexpected abbrev ordering!");
1102 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1103 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1104 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1105 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1106 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1107 Log2_32_Ceil(VE.getTypes().size()+1)));
1108 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1110 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1111 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1112 assert(0 && "Unexpected abbrev ordering!");
1114 { // NULL abbrev for CONSTANTS_BLOCK.
1115 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1116 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1117 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1118 Abbv) != CONSTANTS_NULL_Abbrev)
1119 assert(0 && "Unexpected abbrev ordering!");
1122 // FIXME: This should only use space for first class types!
1124 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1125 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1126 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1127 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1128 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1129 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1130 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1131 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1132 assert(0 && "Unexpected abbrev ordering!");
1134 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1135 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1136 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1137 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1138 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1139 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1140 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1141 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1142 assert(0 && "Unexpected abbrev ordering!");
1144 { // INST_CAST abbrev for FUNCTION_BLOCK.
1145 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1146 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1147 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1148 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1149 Log2_32_Ceil(VE.getTypes().size()+1)));
1150 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1151 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1152 Abbv) != FUNCTION_INST_CAST_ABBREV)
1153 assert(0 && "Unexpected abbrev ordering!");
1156 { // INST_RET abbrev for FUNCTION_BLOCK.
1157 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1158 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1159 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1160 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1161 assert(0 && "Unexpected abbrev ordering!");
1163 { // INST_RET abbrev for FUNCTION_BLOCK.
1164 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1165 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1166 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1167 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1168 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1169 assert(0 && "Unexpected abbrev ordering!");
1171 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1172 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1173 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1174 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1175 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1176 assert(0 && "Unexpected abbrev ordering!");
1183 /// WriteModule - Emit the specified module to the bitstream.
1184 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1185 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1187 // Emit the version number if it is non-zero.
1189 SmallVector<unsigned, 1> Vals;
1190 Vals.push_back(CurVersion);
1191 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1194 // Analyze the module, enumerating globals, functions, etc.
1195 ValueEnumerator VE(M);
1197 // Emit blockinfo, which defines the standard abbreviations etc.
1198 WriteBlockInfo(VE, Stream);
1200 // Emit information about parameter attributes.
1201 WriteParamAttrTable(VE, Stream);
1203 // Emit information describing all of the types in the module.
1204 WriteTypeTable(VE, Stream);
1206 // Emit top-level description of module, including target triple, inline asm,
1207 // descriptors for global variables, and function prototype info.
1208 WriteModuleInfo(M, VE, Stream);
1211 WriteModuleConstants(VE, Stream);
1213 // If we have any aggregate values in the value table, purge them - these can
1214 // only be used to initialize global variables. Doing so makes the value
1215 // namespace smaller for code in functions.
1216 int NumNonAggregates = VE.PurgeAggregateValues();
1217 if (NumNonAggregates != -1) {
1218 SmallVector<unsigned, 1> Vals;
1219 Vals.push_back(NumNonAggregates);
1220 Stream.EmitRecord(bitc::MODULE_CODE_PURGEVALS, Vals);
1223 // Emit function bodies.
1224 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1225 if (!I->isDeclaration())
1226 WriteFunction(*I, VE, Stream);
1228 // Emit the type symbol table information.
1229 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1231 // Emit names for globals/functions etc.
1232 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1238 /// WriteBitcodeToFile - Write the specified module to the specified output
1240 void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) {
1241 std::vector<unsigned char> Buffer;
1242 BitstreamWriter Stream(Buffer);
1244 Buffer.reserve(256*1024);
1246 // Emit the file header.
1247 Stream.Emit((unsigned)'B', 8);
1248 Stream.Emit((unsigned)'C', 8);
1249 Stream.Emit(0x0, 4);
1250 Stream.Emit(0xC, 4);
1251 Stream.Emit(0xE, 4);
1252 Stream.Emit(0xD, 4);
1255 WriteModule(M, Stream);
1257 // Write the generated bitstream to "Out".
1258 Out.write((char*)&Buffer.front(), Buffer.size());
1260 // Make sure it hits disk now.