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/ParamAttrsList.h"
24 #include "llvm/TypeSymbolTable.h"
25 #include "llvm/ValueSymbolTable.h"
26 #include "llvm/Support/MathExtras.h"
29 /// These are manifest constants used by the bitcode writer. They do not need to
30 /// be kept in sync with the reader, but need to be consistent within this file.
34 // VALUE_SYMTAB_BLOCK abbrev id's.
35 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
40 // CONSTANTS_BLOCK abbrev id's.
41 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
42 CONSTANTS_INTEGER_ABBREV,
43 CONSTANTS_CE_CAST_Abbrev,
44 CONSTANTS_NULL_Abbrev,
46 // FUNCTION_BLOCK abbrev id's.
47 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
48 FUNCTION_INST_BINOP_ABBREV,
49 FUNCTION_INST_CAST_ABBREV,
50 FUNCTION_INST_RET_VOID_ABBREV,
51 FUNCTION_INST_RET_VAL_ABBREV,
52 FUNCTION_INST_UNREACHABLE_ABBREV
56 static unsigned GetEncodedCastOpcode(unsigned Opcode) {
58 default: assert(0 && "Unknown cast instruction!");
59 case Instruction::Trunc : return bitc::CAST_TRUNC;
60 case Instruction::ZExt : return bitc::CAST_ZEXT;
61 case Instruction::SExt : return bitc::CAST_SEXT;
62 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
63 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
64 case Instruction::UIToFP : return bitc::CAST_UITOFP;
65 case Instruction::SIToFP : return bitc::CAST_SITOFP;
66 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
67 case Instruction::FPExt : return bitc::CAST_FPEXT;
68 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
69 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
70 case Instruction::BitCast : return bitc::CAST_BITCAST;
74 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) {
76 default: assert(0 && "Unknown binary instruction!");
77 case Instruction::Add: return bitc::BINOP_ADD;
78 case Instruction::Sub: return bitc::BINOP_SUB;
79 case Instruction::Mul: return bitc::BINOP_MUL;
80 case Instruction::UDiv: return bitc::BINOP_UDIV;
81 case Instruction::FDiv:
82 case Instruction::SDiv: return bitc::BINOP_SDIV;
83 case Instruction::URem: return bitc::BINOP_UREM;
84 case Instruction::FRem:
85 case Instruction::SRem: return bitc::BINOP_SREM;
86 case Instruction::Shl: return bitc::BINOP_SHL;
87 case Instruction::LShr: return bitc::BINOP_LSHR;
88 case Instruction::AShr: return bitc::BINOP_ASHR;
89 case Instruction::And: return bitc::BINOP_AND;
90 case Instruction::Or: return bitc::BINOP_OR;
91 case Instruction::Xor: return bitc::BINOP_XOR;
97 static void WriteStringRecord(unsigned Code, const std::string &Str,
98 unsigned AbbrevToUse, BitstreamWriter &Stream) {
99 SmallVector<unsigned, 64> Vals;
101 // Code: [strchar x N]
102 for (unsigned i = 0, e = Str.size(); i != e; ++i)
103 Vals.push_back(Str[i]);
105 // Emit the finished record.
106 Stream.EmitRecord(Code, Vals, AbbrevToUse);
109 // Emit information about parameter attributes.
110 static void WriteParamAttrTable(const ValueEnumerator &VE,
111 BitstreamWriter &Stream) {
112 const std::vector<const ParamAttrsList*> &Attrs = VE.getParamAttrs();
113 if (Attrs.empty()) return;
115 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
117 SmallVector<uint64_t, 64> Record;
118 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
119 const ParamAttrsList *A = Attrs[i];
120 for (unsigned op = 0, e = A->size(); op != e; ++op) {
121 Record.push_back(A->getParamIndex(op));
122 Record.push_back(A->getParamAttrsAtIndex(op));
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 unsigned AbbrevToUse = 0;
426 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
432 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
433 const ValueEnumerator &VE,
434 BitstreamWriter &Stream, bool isGlobal) {
435 if (FirstVal == LastVal) return;
437 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
439 unsigned AggregateAbbrev = 0;
440 unsigned String8Abbrev = 0;
441 unsigned CString7Abbrev = 0;
442 unsigned CString6Abbrev = 0;
443 // If this is a constant pool for the module, emit module-specific abbrevs.
445 // Abbrev for CST_CODE_AGGREGATE.
446 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
447 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
448 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
449 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
450 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
452 // Abbrev for CST_CODE_STRING.
453 Abbv = new BitCodeAbbrev();
454 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
455 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
456 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
457 String8Abbrev = Stream.EmitAbbrev(Abbv);
458 // Abbrev for CST_CODE_CSTRING.
459 Abbv = new BitCodeAbbrev();
460 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
461 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
462 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
463 CString7Abbrev = Stream.EmitAbbrev(Abbv);
464 // Abbrev for CST_CODE_CSTRING.
465 Abbv = new BitCodeAbbrev();
466 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
467 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
468 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
469 CString6Abbrev = Stream.EmitAbbrev(Abbv);
472 SmallVector<uint64_t, 64> Record;
474 const ValueEnumerator::ValueList &Vals = VE.getValues();
475 const Type *LastTy = 0;
476 for (unsigned i = FirstVal; i != LastVal; ++i) {
477 const Value *V = Vals[i].first;
478 // If we need to switch types, do so now.
479 if (V->getType() != LastTy) {
480 LastTy = V->getType();
481 Record.push_back(VE.getTypeID(LastTy));
482 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
483 CONSTANTS_SETTYPE_ABBREV);
487 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
488 Record.push_back(unsigned(IA->hasSideEffects()));
490 // Add the asm string.
491 const std::string &AsmStr = IA->getAsmString();
492 Record.push_back(AsmStr.size());
493 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
494 Record.push_back(AsmStr[i]);
496 // Add the constraint string.
497 const std::string &ConstraintStr = IA->getConstraintString();
498 Record.push_back(ConstraintStr.size());
499 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
500 Record.push_back(ConstraintStr[i]);
501 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
505 const Constant *C = cast<Constant>(V);
507 unsigned AbbrevToUse = 0;
508 if (C->isNullValue()) {
509 Code = bitc::CST_CODE_NULL;
510 } else if (isa<UndefValue>(C)) {
511 Code = bitc::CST_CODE_UNDEF;
512 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
513 if (IV->getBitWidth() <= 64) {
514 int64_t V = IV->getSExtValue();
516 Record.push_back(V << 1);
518 Record.push_back((-V << 1) | 1);
519 Code = bitc::CST_CODE_INTEGER;
520 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
521 } else { // Wide integers, > 64 bits in size.
522 // We have an arbitrary precision integer value to write whose
523 // bit width is > 64. However, in canonical unsigned integer
524 // format it is likely that the high bits are going to be zero.
525 // So, we only write the number of active words.
526 unsigned NWords = IV->getValue().getActiveWords();
527 const uint64_t *RawWords = IV->getValue().getRawData();
528 for (unsigned i = 0; i != NWords; ++i) {
529 int64_t V = RawWords[i];
531 Record.push_back(V << 1);
533 Record.push_back((-V << 1) | 1);
535 Code = bitc::CST_CODE_WIDE_INTEGER;
537 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
538 Code = bitc::CST_CODE_FLOAT;
539 const Type *Ty = CFP->getType();
540 if (Ty == Type::FloatTy || Ty == Type::DoubleTy) {
541 Record.push_back(CFP->getValueAPF().convertToAPInt().getZExtValue());
542 } else if (Ty == Type::X86_FP80Ty) {
543 // api needed to prevent premature destruction
544 APInt api = CFP->getValueAPF().convertToAPInt();
545 const uint64_t *p = api.getRawData();
546 Record.push_back(p[0]);
547 Record.push_back((uint16_t)p[1]);
548 } else if (Ty == Type::FP128Ty || Ty == Type::PPC_FP128Ty) {
549 APInt api = CFP->getValueAPF().convertToAPInt();
550 const uint64_t *p = api.getRawData();
551 Record.push_back(p[0]);
552 Record.push_back(p[1]);
554 assert (0 && "Unknown FP type!");
556 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
557 // Emit constant strings specially.
558 unsigned NumOps = C->getNumOperands();
559 // If this is a null-terminated string, use the denser CSTRING encoding.
560 if (C->getOperand(NumOps-1)->isNullValue()) {
561 Code = bitc::CST_CODE_CSTRING;
562 --NumOps; // Don't encode the null, which isn't allowed by char6.
564 Code = bitc::CST_CODE_STRING;
565 AbbrevToUse = String8Abbrev;
567 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
568 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
569 for (unsigned i = 0; i != NumOps; ++i) {
570 unsigned char V = cast<ConstantInt>(C->getOperand(i))->getZExtValue();
572 isCStr7 &= (V & 128) == 0;
574 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
578 AbbrevToUse = CString6Abbrev;
580 AbbrevToUse = CString7Abbrev;
581 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
582 isa<ConstantVector>(V)) {
583 Code = bitc::CST_CODE_AGGREGATE;
584 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
585 Record.push_back(VE.getValueID(C->getOperand(i)));
586 AbbrevToUse = AggregateAbbrev;
587 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
588 switch (CE->getOpcode()) {
590 if (Instruction::isCast(CE->getOpcode())) {
591 Code = bitc::CST_CODE_CE_CAST;
592 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
593 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
594 Record.push_back(VE.getValueID(C->getOperand(0)));
595 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
597 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
598 Code = bitc::CST_CODE_CE_BINOP;
599 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
600 Record.push_back(VE.getValueID(C->getOperand(0)));
601 Record.push_back(VE.getValueID(C->getOperand(1)));
604 case Instruction::GetElementPtr:
605 Code = bitc::CST_CODE_CE_GEP;
606 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
607 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
608 Record.push_back(VE.getValueID(C->getOperand(i)));
611 case Instruction::Select:
612 Code = bitc::CST_CODE_CE_SELECT;
613 Record.push_back(VE.getValueID(C->getOperand(0)));
614 Record.push_back(VE.getValueID(C->getOperand(1)));
615 Record.push_back(VE.getValueID(C->getOperand(2)));
617 case Instruction::ExtractElement:
618 Code = bitc::CST_CODE_CE_EXTRACTELT;
619 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
620 Record.push_back(VE.getValueID(C->getOperand(0)));
621 Record.push_back(VE.getValueID(C->getOperand(1)));
623 case Instruction::InsertElement:
624 Code = bitc::CST_CODE_CE_INSERTELT;
625 Record.push_back(VE.getValueID(C->getOperand(0)));
626 Record.push_back(VE.getValueID(C->getOperand(1)));
627 Record.push_back(VE.getValueID(C->getOperand(2)));
629 case Instruction::ShuffleVector:
630 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
631 Record.push_back(VE.getValueID(C->getOperand(0)));
632 Record.push_back(VE.getValueID(C->getOperand(1)));
633 Record.push_back(VE.getValueID(C->getOperand(2)));
635 case Instruction::ICmp:
636 case Instruction::FCmp:
637 Code = bitc::CST_CODE_CE_CMP;
638 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
639 Record.push_back(VE.getValueID(C->getOperand(0)));
640 Record.push_back(VE.getValueID(C->getOperand(1)));
641 Record.push_back(CE->getPredicate());
645 assert(0 && "Unknown constant!");
647 Stream.EmitRecord(Code, Record, AbbrevToUse);
654 static void WriteModuleConstants(const ValueEnumerator &VE,
655 BitstreamWriter &Stream) {
656 const ValueEnumerator::ValueList &Vals = VE.getValues();
658 // Find the first constant to emit, which is the first non-globalvalue value.
659 // We know globalvalues have been emitted by WriteModuleInfo.
660 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
661 if (!isa<GlobalValue>(Vals[i].first)) {
662 WriteConstants(i, Vals.size(), VE, Stream, true);
668 /// PushValueAndType - The file has to encode both the value and type id for
669 /// many values, because we need to know what type to create for forward
670 /// references. However, most operands are not forward references, so this type
671 /// field is not needed.
673 /// This function adds V's value ID to Vals. If the value ID is higher than the
674 /// instruction ID, then it is a forward reference, and it also includes the
676 static bool PushValueAndType(Value *V, unsigned InstID,
677 SmallVector<unsigned, 64> &Vals,
678 ValueEnumerator &VE) {
679 unsigned ValID = VE.getValueID(V);
680 Vals.push_back(ValID);
681 if (ValID >= InstID) {
682 Vals.push_back(VE.getTypeID(V->getType()));
688 /// WriteInstruction - Emit an instruction to the specified stream.
689 static void WriteInstruction(const Instruction &I, unsigned InstID,
690 ValueEnumerator &VE, BitstreamWriter &Stream,
691 SmallVector<unsigned, 64> &Vals) {
693 unsigned AbbrevToUse = 0;
694 switch (I.getOpcode()) {
696 if (Instruction::isCast(I.getOpcode())) {
697 Code = bitc::FUNC_CODE_INST_CAST;
698 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
699 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
700 Vals.push_back(VE.getTypeID(I.getType()));
701 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
703 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
704 Code = bitc::FUNC_CODE_INST_BINOP;
705 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
706 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
707 Vals.push_back(VE.getValueID(I.getOperand(1)));
708 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
712 case Instruction::GetElementPtr:
713 Code = bitc::FUNC_CODE_INST_GEP;
714 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
715 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
717 case Instruction::Select:
718 Code = bitc::FUNC_CODE_INST_SELECT;
719 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
720 Vals.push_back(VE.getValueID(I.getOperand(2)));
721 Vals.push_back(VE.getValueID(I.getOperand(0)));
723 case Instruction::ExtractElement:
724 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
725 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
726 Vals.push_back(VE.getValueID(I.getOperand(1)));
728 case Instruction::InsertElement:
729 Code = bitc::FUNC_CODE_INST_INSERTELT;
730 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
731 Vals.push_back(VE.getValueID(I.getOperand(1)));
732 Vals.push_back(VE.getValueID(I.getOperand(2)));
734 case Instruction::ShuffleVector:
735 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
736 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
737 Vals.push_back(VE.getValueID(I.getOperand(1)));
738 Vals.push_back(VE.getValueID(I.getOperand(2)));
740 case Instruction::ICmp:
741 case Instruction::FCmp:
742 Code = bitc::FUNC_CODE_INST_CMP;
743 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
744 Vals.push_back(VE.getValueID(I.getOperand(1)));
745 Vals.push_back(cast<CmpInst>(I).getPredicate());
747 case Instruction::GetResult:
748 Code = bitc::FUNC_CODE_INST_GETRESULT;
749 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
750 Vals.push_back(Log2_32(cast<GetResultInst>(I).getIndex())+1);
753 case Instruction::Ret:
754 Code = bitc::FUNC_CODE_INST_RET;
755 if (!I.getNumOperands())
756 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
757 else if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
758 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
760 case Instruction::Br:
761 Code = bitc::FUNC_CODE_INST_BR;
762 Vals.push_back(VE.getValueID(I.getOperand(0)));
763 if (cast<BranchInst>(I).isConditional()) {
764 Vals.push_back(VE.getValueID(I.getOperand(1)));
765 Vals.push_back(VE.getValueID(I.getOperand(2)));
768 case Instruction::Switch:
769 Code = bitc::FUNC_CODE_INST_SWITCH;
770 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
771 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
772 Vals.push_back(VE.getValueID(I.getOperand(i)));
774 case Instruction::Invoke: {
775 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
776 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
777 Code = bitc::FUNC_CODE_INST_INVOKE;
779 const InvokeInst *II = cast<InvokeInst>(&I);
780 Vals.push_back(VE.getParamAttrID(II->getParamAttrs()));
781 Vals.push_back(II->getCallingConv());
782 Vals.push_back(VE.getValueID(I.getOperand(1))); // normal dest
783 Vals.push_back(VE.getValueID(I.getOperand(2))); // unwind dest
784 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // callee
786 // Emit value #'s for the fixed parameters.
787 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
788 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param.
790 // Emit type/value pairs for varargs params.
791 if (FTy->isVarArg()) {
792 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands();
794 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
798 case Instruction::Unwind:
799 Code = bitc::FUNC_CODE_INST_UNWIND;
801 case Instruction::Unreachable:
802 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
803 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
806 case Instruction::PHI:
807 Code = bitc::FUNC_CODE_INST_PHI;
808 Vals.push_back(VE.getTypeID(I.getType()));
809 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
810 Vals.push_back(VE.getValueID(I.getOperand(i)));
813 case Instruction::Malloc:
814 Code = bitc::FUNC_CODE_INST_MALLOC;
815 Vals.push_back(VE.getTypeID(I.getType()));
816 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
817 Vals.push_back(Log2_32(cast<MallocInst>(I).getAlignment())+1);
820 case Instruction::Free:
821 Code = bitc::FUNC_CODE_INST_FREE;
822 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
825 case Instruction::Alloca:
826 Code = bitc::FUNC_CODE_INST_ALLOCA;
827 Vals.push_back(VE.getTypeID(I.getType()));
828 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
829 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
832 case Instruction::Load:
833 Code = bitc::FUNC_CODE_INST_LOAD;
834 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
835 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
837 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
838 Vals.push_back(cast<LoadInst>(I).isVolatile());
840 case Instruction::Store:
841 Code = bitc::FUNC_CODE_INST_STORE2;
842 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
843 Vals.push_back(VE.getValueID(I.getOperand(0))); // val.
844 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
845 Vals.push_back(cast<StoreInst>(I).isVolatile());
847 case Instruction::Call: {
848 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
849 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
851 Code = bitc::FUNC_CODE_INST_CALL;
853 const CallInst *CI = cast<CallInst>(&I);
854 Vals.push_back(VE.getParamAttrID(CI->getParamAttrs()));
855 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall()));
856 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee
858 // Emit value #'s for the fixed parameters.
859 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
860 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param.
862 // Emit type/value pairs for varargs params.
863 if (FTy->isVarArg()) {
864 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams();
865 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands();
867 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs
871 case Instruction::VAArg:
872 Code = bitc::FUNC_CODE_INST_VAARG;
873 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
874 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
875 Vals.push_back(VE.getTypeID(I.getType())); // restype.
879 Stream.EmitRecord(Code, Vals, AbbrevToUse);
883 // Emit names for globals/functions etc.
884 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
885 const ValueEnumerator &VE,
886 BitstreamWriter &Stream) {
887 if (VST.empty()) return;
888 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
890 // FIXME: Set up the abbrev, we know how many values there are!
891 // FIXME: We know if the type names can use 7-bit ascii.
892 SmallVector<unsigned, 64> NameVals;
894 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
897 const ValueName &Name = *SI;
899 // Figure out the encoding to use for the name.
902 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
905 isChar6 = BitCodeAbbrevOp::isChar6(*C);
906 if ((unsigned char)*C & 128) {
908 break; // don't bother scanning the rest.
912 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
914 // VST_ENTRY: [valueid, namechar x N]
915 // VST_BBENTRY: [bbid, namechar x N]
917 if (isa<BasicBlock>(SI->getValue())) {
918 Code = bitc::VST_CODE_BBENTRY;
920 AbbrevToUse = VST_BBENTRY_6_ABBREV;
922 Code = bitc::VST_CODE_ENTRY;
924 AbbrevToUse = VST_ENTRY_6_ABBREV;
926 AbbrevToUse = VST_ENTRY_7_ABBREV;
929 NameVals.push_back(VE.getValueID(SI->getValue()));
930 for (const char *P = Name.getKeyData(),
931 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
932 NameVals.push_back((unsigned char)*P);
934 // Emit the finished record.
935 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
941 /// WriteFunction - Emit a function body to the module stream.
942 static void WriteFunction(const Function &F, ValueEnumerator &VE,
943 BitstreamWriter &Stream) {
944 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
945 VE.incorporateFunction(F);
947 SmallVector<unsigned, 64> Vals;
949 // Emit the number of basic blocks, so the reader can create them ahead of
951 Vals.push_back(VE.getBasicBlocks().size());
952 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
955 // If there are function-local constants, emit them now.
956 unsigned CstStart, CstEnd;
957 VE.getFunctionConstantRange(CstStart, CstEnd);
958 WriteConstants(CstStart, CstEnd, VE, Stream, false);
960 // Keep a running idea of what the instruction ID is.
961 unsigned InstID = CstEnd;
963 // Finally, emit all the instructions, in order.
964 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
965 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
967 WriteInstruction(*I, InstID, VE, Stream, Vals);
968 if (I->getType() != Type::VoidTy)
972 // Emit names for all the instructions etc.
973 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
979 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
980 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
981 const ValueEnumerator &VE,
982 BitstreamWriter &Stream) {
983 if (TST.empty()) return;
985 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
987 // 7-bit fixed width VST_CODE_ENTRY strings.
988 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
989 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
990 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
991 Log2_32_Ceil(VE.getTypes().size()+1)));
992 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
993 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
994 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
996 SmallVector<unsigned, 64> NameVals;
998 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
1000 // TST_ENTRY: [typeid, namechar x N]
1001 NameVals.push_back(VE.getTypeID(TI->second));
1003 const std::string &Str = TI->first;
1005 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
1006 NameVals.push_back((unsigned char)Str[i]);
1011 // Emit the finished record.
1012 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
1019 // Emit blockinfo, which defines the standard abbreviations etc.
1020 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1021 // We only want to emit block info records for blocks that have multiple
1022 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1023 // blocks can defined their abbrevs inline.
1024 Stream.EnterBlockInfoBlock(2);
1026 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1027 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1028 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1029 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1030 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1031 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1032 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1033 Abbv) != VST_ENTRY_8_ABBREV)
1034 assert(0 && "Unexpected abbrev ordering!");
1037 { // 7-bit fixed width VST_ENTRY strings.
1038 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1039 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1040 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1041 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1042 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1043 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1044 Abbv) != VST_ENTRY_7_ABBREV)
1045 assert(0 && "Unexpected abbrev ordering!");
1047 { // 6-bit char6 VST_ENTRY strings.
1048 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1049 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1050 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1051 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1052 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1053 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1054 Abbv) != VST_ENTRY_6_ABBREV)
1055 assert(0 && "Unexpected abbrev ordering!");
1057 { // 6-bit char6 VST_BBENTRY strings.
1058 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1059 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1060 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1061 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1062 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1063 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1064 Abbv) != VST_BBENTRY_6_ABBREV)
1065 assert(0 && "Unexpected abbrev ordering!");
1070 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1071 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1072 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1073 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1074 Log2_32_Ceil(VE.getTypes().size()+1)));
1075 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1076 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1077 assert(0 && "Unexpected abbrev ordering!");
1080 { // INTEGER abbrev for CONSTANTS_BLOCK.
1081 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1082 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1083 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1084 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1085 Abbv) != CONSTANTS_INTEGER_ABBREV)
1086 assert(0 && "Unexpected abbrev ordering!");
1089 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1090 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1091 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1092 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1093 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1094 Log2_32_Ceil(VE.getTypes().size()+1)));
1095 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1097 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1098 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1099 assert(0 && "Unexpected abbrev ordering!");
1101 { // NULL abbrev for CONSTANTS_BLOCK.
1102 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1103 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1104 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1105 Abbv) != CONSTANTS_NULL_Abbrev)
1106 assert(0 && "Unexpected abbrev ordering!");
1109 // FIXME: This should only use space for first class types!
1111 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1112 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1113 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1114 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1115 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1116 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1117 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1118 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1119 assert(0 && "Unexpected abbrev ordering!");
1121 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1122 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1123 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1124 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1125 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1126 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1127 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1128 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1129 assert(0 && "Unexpected abbrev ordering!");
1131 { // INST_CAST abbrev for FUNCTION_BLOCK.
1132 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1133 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1134 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1135 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1136 Log2_32_Ceil(VE.getTypes().size()+1)));
1137 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1138 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1139 Abbv) != FUNCTION_INST_CAST_ABBREV)
1140 assert(0 && "Unexpected abbrev ordering!");
1143 { // INST_RET abbrev for FUNCTION_BLOCK.
1144 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1145 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1146 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1147 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1148 assert(0 && "Unexpected abbrev ordering!");
1150 { // INST_RET abbrev for FUNCTION_BLOCK.
1151 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1152 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1153 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1154 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1155 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1156 assert(0 && "Unexpected abbrev ordering!");
1158 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1159 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1160 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1161 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1162 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1163 assert(0 && "Unexpected abbrev ordering!");
1170 /// WriteModule - Emit the specified module to the bitstream.
1171 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1172 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1174 // Emit the version number if it is non-zero.
1176 SmallVector<unsigned, 1> Vals;
1177 Vals.push_back(CurVersion);
1178 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1181 // Analyze the module, enumerating globals, functions, etc.
1182 ValueEnumerator VE(M);
1184 // Emit blockinfo, which defines the standard abbreviations etc.
1185 WriteBlockInfo(VE, Stream);
1187 // Emit information about parameter attributes.
1188 WriteParamAttrTable(VE, Stream);
1190 // Emit information describing all of the types in the module.
1191 WriteTypeTable(VE, Stream);
1193 // Emit top-level description of module, including target triple, inline asm,
1194 // descriptors for global variables, and function prototype info.
1195 WriteModuleInfo(M, VE, Stream);
1198 WriteModuleConstants(VE, Stream);
1200 // If we have any aggregate values in the value table, purge them - these can
1201 // only be used to initialize global variables. Doing so makes the value
1202 // namespace smaller for code in functions.
1203 int NumNonAggregates = VE.PurgeAggregateValues();
1204 if (NumNonAggregates != -1) {
1205 SmallVector<unsigned, 1> Vals;
1206 Vals.push_back(NumNonAggregates);
1207 Stream.EmitRecord(bitc::MODULE_CODE_PURGEVALS, Vals);
1210 // Emit function bodies.
1211 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1212 if (!I->isDeclaration())
1213 WriteFunction(*I, VE, Stream);
1215 // Emit the type symbol table information.
1216 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1218 // Emit names for globals/functions etc.
1219 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1225 /// WriteBitcodeToFile - Write the specified module to the specified output
1227 void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) {
1228 std::vector<unsigned char> Buffer;
1229 BitstreamWriter Stream(Buffer);
1231 Buffer.reserve(256*1024);
1233 // Emit the file header.
1234 Stream.Emit((unsigned)'B', 8);
1235 Stream.Emit((unsigned)'C', 8);
1236 Stream.Emit(0x0, 4);
1237 Stream.Emit(0xC, 4);
1238 Stream.Emit(0xE, 4);
1239 Stream.Emit(0xD, 4);
1242 WriteModule(M, Stream);
1244 // Write the generated bitstream to "Out".
1245 Out.write((char*)&Buffer.front(), Buffer.size());
1247 // Make sure it hits disk now.