1 //===--- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source 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/ParameterAttributes.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 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
146 // Abbrev for TYPE_CODE_FUNCTION.
147 Abbv = new BitCodeAbbrev();
148 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
149 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
150 Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0
151 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
152 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
153 Log2_32_Ceil(VE.getTypes().size()+1)));
154 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
156 // Abbrev for TYPE_CODE_STRUCT.
157 Abbv = new BitCodeAbbrev();
158 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT));
159 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
160 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
161 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
162 Log2_32_Ceil(VE.getTypes().size()+1)));
163 unsigned StructAbbrev = Stream.EmitAbbrev(Abbv);
165 // Abbrev for TYPE_CODE_ARRAY.
166 Abbv = new BitCodeAbbrev();
167 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
168 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
169 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
170 Log2_32_Ceil(VE.getTypes().size()+1)));
171 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
173 // Emit an entry count so the reader can reserve space.
174 TypeVals.push_back(TypeList.size());
175 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
178 // Loop over all of the types, emitting each in turn.
179 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
180 const Type *T = TypeList[i].first;
184 switch (T->getTypeID()) {
185 default: assert(0 && "Unknown type!");
186 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
187 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
188 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
189 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
190 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
191 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
192 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
193 case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break;
194 case Type::IntegerTyID:
196 Code = bitc::TYPE_CODE_INTEGER;
197 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
199 case Type::PointerTyID:
200 // POINTER: [pointee type]
201 Code = bitc::TYPE_CODE_POINTER;
202 TypeVals.push_back(VE.getTypeID(cast<PointerType>(T)->getElementType()));
203 AbbrevToUse = PtrAbbrev;
206 case Type::FunctionTyID: {
207 const FunctionType *FT = cast<FunctionType>(T);
208 // FUNCTION: [isvararg, attrid, retty, paramty x N]
209 Code = bitc::TYPE_CODE_FUNCTION;
210 TypeVals.push_back(FT->isVarArg());
211 TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0
212 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
213 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
214 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
215 AbbrevToUse = FunctionAbbrev;
218 case Type::StructTyID: {
219 const StructType *ST = cast<StructType>(T);
220 // STRUCT: [ispacked, eltty x N]
221 Code = bitc::TYPE_CODE_STRUCT;
222 TypeVals.push_back(ST->isPacked());
223 // Output all of the element types.
224 for (StructType::element_iterator I = ST->element_begin(),
225 E = ST->element_end(); I != E; ++I)
226 TypeVals.push_back(VE.getTypeID(*I));
227 AbbrevToUse = StructAbbrev;
230 case Type::ArrayTyID: {
231 const ArrayType *AT = cast<ArrayType>(T);
232 // ARRAY: [numelts, eltty]
233 Code = bitc::TYPE_CODE_ARRAY;
234 TypeVals.push_back(AT->getNumElements());
235 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
236 AbbrevToUse = ArrayAbbrev;
239 case Type::VectorTyID: {
240 const VectorType *VT = cast<VectorType>(T);
241 // VECTOR [numelts, eltty]
242 Code = bitc::TYPE_CODE_VECTOR;
243 TypeVals.push_back(VT->getNumElements());
244 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
249 // Emit the finished record.
250 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
257 static unsigned getEncodedLinkage(const GlobalValue *GV) {
258 switch (GV->getLinkage()) {
259 default: assert(0 && "Invalid linkage!");
260 case GlobalValue::GhostLinkage: // Map ghost linkage onto external.
261 case GlobalValue::ExternalLinkage: return 0;
262 case GlobalValue::WeakLinkage: return 1;
263 case GlobalValue::AppendingLinkage: return 2;
264 case GlobalValue::InternalLinkage: return 3;
265 case GlobalValue::LinkOnceLinkage: return 4;
266 case GlobalValue::DLLImportLinkage: return 5;
267 case GlobalValue::DLLExportLinkage: return 6;
268 case GlobalValue::ExternalWeakLinkage: return 7;
272 static unsigned getEncodedVisibility(const GlobalValue *GV) {
273 switch (GV->getVisibility()) {
274 default: assert(0 && "Invalid visibility!");
275 case GlobalValue::DefaultVisibility: return 0;
276 case GlobalValue::HiddenVisibility: return 1;
277 case GlobalValue::ProtectedVisibility: return 2;
281 // Emit top-level description of module, including target triple, inline asm,
282 // descriptors for global variables, and function prototype info.
283 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
284 BitstreamWriter &Stream) {
285 // Emit the list of dependent libraries for the Module.
286 for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I)
287 WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream);
289 // Emit various pieces of data attached to a module.
290 if (!M->getTargetTriple().empty())
291 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
293 if (!M->getDataLayout().empty())
294 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(),
296 if (!M->getModuleInlineAsm().empty())
297 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
300 // Emit information about sections, computing how many there are. Also
301 // compute the maximum alignment value.
302 std::map<std::string, unsigned> SectionMap;
303 unsigned MaxAlignment = 0;
304 unsigned MaxGlobalType = 0;
305 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
307 MaxAlignment = std::max(MaxAlignment, GV->getAlignment());
308 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType()));
310 if (!GV->hasSection()) continue;
311 // Give section names unique ID's.
312 unsigned &Entry = SectionMap[GV->getSection()];
313 if (Entry != 0) continue;
314 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(),
316 Entry = SectionMap.size();
318 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
319 MaxAlignment = std::max(MaxAlignment, F->getAlignment());
320 if (!F->hasSection()) continue;
321 // Give section names unique ID's.
322 unsigned &Entry = SectionMap[F->getSection()];
323 if (Entry != 0) continue;
324 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(),
326 Entry = SectionMap.size();
329 // Emit abbrev for globals, now that we know # sections and max alignment.
330 unsigned SimpleGVarAbbrev = 0;
331 if (!M->global_empty()) {
332 // Add an abbrev for common globals with no visibility or thread localness.
333 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
334 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
335 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
336 Log2_32_Ceil(MaxGlobalType+1)));
337 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
338 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
339 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage.
340 if (MaxAlignment == 0) // Alignment.
341 Abbv->Add(BitCodeAbbrevOp(0));
343 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
344 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
345 Log2_32_Ceil(MaxEncAlignment+1)));
347 if (SectionMap.empty()) // Section.
348 Abbv->Add(BitCodeAbbrevOp(0));
350 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
351 Log2_32_Ceil(SectionMap.size()+1)));
352 // Don't bother emitting vis + thread local.
353 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
356 // Emit the global variable information.
357 SmallVector<unsigned, 64> Vals;
358 for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end();
360 unsigned AbbrevToUse = 0;
362 // GLOBALVAR: [type, isconst, initid,
363 // linkage, alignment, section, visibility, threadlocal]
364 Vals.push_back(VE.getTypeID(GV->getType()));
365 Vals.push_back(GV->isConstant());
366 Vals.push_back(GV->isDeclaration() ? 0 :
367 (VE.getValueID(GV->getInitializer()) + 1));
368 Vals.push_back(getEncodedLinkage(GV));
369 Vals.push_back(Log2_32(GV->getAlignment())+1);
370 Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0);
371 if (GV->isThreadLocal() ||
372 GV->getVisibility() != GlobalValue::DefaultVisibility) {
373 Vals.push_back(getEncodedVisibility(GV));
374 Vals.push_back(GV->isThreadLocal());
376 AbbrevToUse = SimpleGVarAbbrev;
379 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
383 // Emit the function proto information.
384 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
385 // FUNCTION: [type, callingconv, isproto, paramattr,
386 // linkage, alignment, section, visibility]
387 Vals.push_back(VE.getTypeID(F->getType()));
388 Vals.push_back(F->getCallingConv());
389 Vals.push_back(F->isDeclaration());
390 Vals.push_back(getEncodedLinkage(F));
391 Vals.push_back(VE.getParamAttrID(F->getParamAttrs()));
392 Vals.push_back(Log2_32(F->getAlignment())+1);
393 Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0);
394 Vals.push_back(getEncodedVisibility(F));
396 unsigned AbbrevToUse = 0;
397 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
402 // Emit the alias information.
403 for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
405 Vals.push_back(VE.getTypeID(AI->getType()));
406 Vals.push_back(VE.getValueID(AI->getAliasee()));
407 Vals.push_back(getEncodedLinkage(AI));
408 unsigned AbbrevToUse = 0;
409 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
415 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
416 const ValueEnumerator &VE,
417 BitstreamWriter &Stream, bool isGlobal) {
418 if (FirstVal == LastVal) return;
420 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
422 unsigned AggregateAbbrev = 0;
423 unsigned String8Abbrev = 0;
424 unsigned CString7Abbrev = 0;
425 unsigned CString6Abbrev = 0;
426 // If this is a constant pool for the module, emit module-specific abbrevs.
428 // Abbrev for CST_CODE_AGGREGATE.
429 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
430 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
431 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
432 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
433 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
435 // Abbrev for CST_CODE_STRING.
436 Abbv = new BitCodeAbbrev();
437 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
438 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
439 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
440 String8Abbrev = Stream.EmitAbbrev(Abbv);
441 // Abbrev for CST_CODE_CSTRING.
442 Abbv = new BitCodeAbbrev();
443 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
444 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
445 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
446 CString7Abbrev = Stream.EmitAbbrev(Abbv);
447 // Abbrev for CST_CODE_CSTRING.
448 Abbv = new BitCodeAbbrev();
449 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
450 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
451 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
452 CString6Abbrev = Stream.EmitAbbrev(Abbv);
455 SmallVector<uint64_t, 64> Record;
457 const ValueEnumerator::ValueList &Vals = VE.getValues();
458 const Type *LastTy = 0;
459 for (unsigned i = FirstVal; i != LastVal; ++i) {
460 const Value *V = Vals[i].first;
461 // If we need to switch types, do so now.
462 if (V->getType() != LastTy) {
463 LastTy = V->getType();
464 Record.push_back(VE.getTypeID(LastTy));
465 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
466 CONSTANTS_SETTYPE_ABBREV);
470 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
471 Record.push_back(unsigned(IA->hasSideEffects()));
473 // Add the asm string.
474 const std::string &AsmStr = IA->getAsmString();
475 Record.push_back(AsmStr.size());
476 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
477 Record.push_back(AsmStr[i]);
479 // Add the constraint string.
480 const std::string &ConstraintStr = IA->getConstraintString();
481 Record.push_back(ConstraintStr.size());
482 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
483 Record.push_back(ConstraintStr[i]);
484 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
488 const Constant *C = cast<Constant>(V);
490 unsigned AbbrevToUse = 0;
491 if (C->isNullValue()) {
492 Code = bitc::CST_CODE_NULL;
493 } else if (isa<UndefValue>(C)) {
494 Code = bitc::CST_CODE_UNDEF;
495 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
496 if (IV->getBitWidth() <= 64) {
497 int64_t V = IV->getSExtValue();
499 Record.push_back(V << 1);
501 Record.push_back((-V << 1) | 1);
502 Code = bitc::CST_CODE_INTEGER;
503 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
504 } else { // Wide integers, > 64 bits in size.
505 // We have an arbitrary precision integer value to write whose
506 // bit width is > 64. However, in canonical unsigned integer
507 // format it is likely that the high bits are going to be zero.
508 // So, we only write the number of active words.
509 unsigned NWords = IV->getValue().getActiveWords();
510 const uint64_t *RawWords = IV->getValue().getRawData();
511 for (unsigned i = 0; i != NWords; ++i) {
512 int64_t V = RawWords[i];
514 Record.push_back(V << 1);
516 Record.push_back((-V << 1) | 1);
518 Code = bitc::CST_CODE_WIDE_INTEGER;
520 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
521 Code = bitc::CST_CODE_FLOAT;
522 const Type *Ty = CFP->getType();
523 if (Ty == Type::FloatTy || Ty == Type::DoubleTy) {
524 Record.push_back(CFP->getValueAPF().convertToAPInt().getZExtValue());
525 } else if (Ty == Type::X86_FP80Ty) {
526 // api needed to prevent premature destruction
527 APInt api = CFP->getValueAPF().convertToAPInt();
528 const uint64_t *p = api.getRawData();
529 Record.push_back(p[0]);
530 Record.push_back((uint16_t)p[1]);
531 } else if (Ty == Type::FP128Ty || Ty == Type::PPC_FP128Ty) {
532 APInt api = CFP->getValueAPF().convertToAPInt();
533 const uint64_t *p = api.getRawData();
534 Record.push_back(p[0]);
535 Record.push_back(p[1]);
537 assert (0 && "Unknown FP type!");
539 } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
540 // Emit constant strings specially.
541 unsigned NumOps = C->getNumOperands();
542 // If this is a null-terminated string, use the denser CSTRING encoding.
543 if (C->getOperand(NumOps-1)->isNullValue()) {
544 Code = bitc::CST_CODE_CSTRING;
545 --NumOps; // Don't encode the null, which isn't allowed by char6.
547 Code = bitc::CST_CODE_STRING;
548 AbbrevToUse = String8Abbrev;
550 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
551 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
552 for (unsigned i = 0; i != NumOps; ++i) {
553 unsigned char V = cast<ConstantInt>(C->getOperand(i))->getZExtValue();
555 isCStr7 &= (V & 128) == 0;
557 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
561 AbbrevToUse = CString6Abbrev;
563 AbbrevToUse = CString7Abbrev;
564 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
565 isa<ConstantVector>(V)) {
566 Code = bitc::CST_CODE_AGGREGATE;
567 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
568 Record.push_back(VE.getValueID(C->getOperand(i)));
569 AbbrevToUse = AggregateAbbrev;
570 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
571 switch (CE->getOpcode()) {
573 if (Instruction::isCast(CE->getOpcode())) {
574 Code = bitc::CST_CODE_CE_CAST;
575 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
576 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
577 Record.push_back(VE.getValueID(C->getOperand(0)));
578 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
580 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
581 Code = bitc::CST_CODE_CE_BINOP;
582 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
583 Record.push_back(VE.getValueID(C->getOperand(0)));
584 Record.push_back(VE.getValueID(C->getOperand(1)));
587 case Instruction::GetElementPtr:
588 Code = bitc::CST_CODE_CE_GEP;
589 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
590 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
591 Record.push_back(VE.getValueID(C->getOperand(i)));
594 case Instruction::Select:
595 Code = bitc::CST_CODE_CE_SELECT;
596 Record.push_back(VE.getValueID(C->getOperand(0)));
597 Record.push_back(VE.getValueID(C->getOperand(1)));
598 Record.push_back(VE.getValueID(C->getOperand(2)));
600 case Instruction::ExtractElement:
601 Code = bitc::CST_CODE_CE_EXTRACTELT;
602 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
603 Record.push_back(VE.getValueID(C->getOperand(0)));
604 Record.push_back(VE.getValueID(C->getOperand(1)));
606 case Instruction::InsertElement:
607 Code = bitc::CST_CODE_CE_INSERTELT;
608 Record.push_back(VE.getValueID(C->getOperand(0)));
609 Record.push_back(VE.getValueID(C->getOperand(1)));
610 Record.push_back(VE.getValueID(C->getOperand(2)));
612 case Instruction::ShuffleVector:
613 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
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::ICmp:
619 case Instruction::FCmp:
620 Code = bitc::CST_CODE_CE_CMP;
621 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
622 Record.push_back(VE.getValueID(C->getOperand(0)));
623 Record.push_back(VE.getValueID(C->getOperand(1)));
624 Record.push_back(CE->getPredicate());
628 assert(0 && "Unknown constant!");
630 Stream.EmitRecord(Code, Record, AbbrevToUse);
637 static void WriteModuleConstants(const ValueEnumerator &VE,
638 BitstreamWriter &Stream) {
639 const ValueEnumerator::ValueList &Vals = VE.getValues();
641 // Find the first constant to emit, which is the first non-globalvalue value.
642 // We know globalvalues have been emitted by WriteModuleInfo.
643 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
644 if (!isa<GlobalValue>(Vals[i].first)) {
645 WriteConstants(i, Vals.size(), VE, Stream, true);
651 /// PushValueAndType - The file has to encode both the value and type id for
652 /// many values, because we need to know what type to create for forward
653 /// references. However, most operands are not forward references, so this type
654 /// field is not needed.
656 /// This function adds V's value ID to Vals. If the value ID is higher than the
657 /// instruction ID, then it is a forward reference, and it also includes the
659 static bool PushValueAndType(Value *V, unsigned InstID,
660 SmallVector<unsigned, 64> &Vals,
661 ValueEnumerator &VE) {
662 unsigned ValID = VE.getValueID(V);
663 Vals.push_back(ValID);
664 if (ValID >= InstID) {
665 Vals.push_back(VE.getTypeID(V->getType()));
671 /// WriteInstruction - Emit an instruction to the specified stream.
672 static void WriteInstruction(const Instruction &I, unsigned InstID,
673 ValueEnumerator &VE, BitstreamWriter &Stream,
674 SmallVector<unsigned, 64> &Vals) {
676 unsigned AbbrevToUse = 0;
677 switch (I.getOpcode()) {
679 if (Instruction::isCast(I.getOpcode())) {
680 Code = bitc::FUNC_CODE_INST_CAST;
681 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
682 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
683 Vals.push_back(VE.getTypeID(I.getType()));
684 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
686 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
687 Code = bitc::FUNC_CODE_INST_BINOP;
688 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
689 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
690 Vals.push_back(VE.getValueID(I.getOperand(1)));
691 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
695 case Instruction::GetElementPtr:
696 Code = bitc::FUNC_CODE_INST_GEP;
697 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
698 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
700 case Instruction::Select:
701 Code = bitc::FUNC_CODE_INST_SELECT;
702 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
703 Vals.push_back(VE.getValueID(I.getOperand(2)));
704 Vals.push_back(VE.getValueID(I.getOperand(0)));
706 case Instruction::ExtractElement:
707 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
708 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
709 Vals.push_back(VE.getValueID(I.getOperand(1)));
711 case Instruction::InsertElement:
712 Code = bitc::FUNC_CODE_INST_INSERTELT;
713 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
714 Vals.push_back(VE.getValueID(I.getOperand(1)));
715 Vals.push_back(VE.getValueID(I.getOperand(2)));
717 case Instruction::ShuffleVector:
718 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
719 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
720 Vals.push_back(VE.getValueID(I.getOperand(1)));
721 Vals.push_back(VE.getValueID(I.getOperand(2)));
723 case Instruction::ICmp:
724 case Instruction::FCmp:
725 Code = bitc::FUNC_CODE_INST_CMP;
726 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
727 Vals.push_back(VE.getValueID(I.getOperand(1)));
728 Vals.push_back(cast<CmpInst>(I).getPredicate());
731 case Instruction::Ret:
732 Code = bitc::FUNC_CODE_INST_RET;
733 if (!I.getNumOperands())
734 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
735 else if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
736 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
738 case Instruction::Br:
739 Code = bitc::FUNC_CODE_INST_BR;
740 Vals.push_back(VE.getValueID(I.getOperand(0)));
741 if (cast<BranchInst>(I).isConditional()) {
742 Vals.push_back(VE.getValueID(I.getOperand(1)));
743 Vals.push_back(VE.getValueID(I.getOperand(2)));
746 case Instruction::Switch:
747 Code = bitc::FUNC_CODE_INST_SWITCH;
748 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
749 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
750 Vals.push_back(VE.getValueID(I.getOperand(i)));
752 case Instruction::Invoke: {
753 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
754 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
755 Code = bitc::FUNC_CODE_INST_INVOKE;
757 const InvokeInst *II = cast<InvokeInst>(&I);
758 Vals.push_back(VE.getParamAttrID(II->getParamAttrs()));
759 Vals.push_back(II->getCallingConv());
760 Vals.push_back(VE.getValueID(I.getOperand(1))); // normal dest
761 Vals.push_back(VE.getValueID(I.getOperand(2))); // unwind dest
762 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // callee
764 // Emit value #'s for the fixed parameters.
765 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
766 Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param.
768 // Emit type/value pairs for varargs params.
769 if (FTy->isVarArg()) {
770 for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands();
772 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
776 case Instruction::Unwind:
777 Code = bitc::FUNC_CODE_INST_UNWIND;
779 case Instruction::Unreachable:
780 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
781 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
784 case Instruction::PHI:
785 Code = bitc::FUNC_CODE_INST_PHI;
786 Vals.push_back(VE.getTypeID(I.getType()));
787 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
788 Vals.push_back(VE.getValueID(I.getOperand(i)));
791 case Instruction::Malloc:
792 Code = bitc::FUNC_CODE_INST_MALLOC;
793 Vals.push_back(VE.getTypeID(I.getType()));
794 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
795 Vals.push_back(Log2_32(cast<MallocInst>(I).getAlignment())+1);
798 case Instruction::Free:
799 Code = bitc::FUNC_CODE_INST_FREE;
800 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
803 case Instruction::Alloca:
804 Code = bitc::FUNC_CODE_INST_ALLOCA;
805 Vals.push_back(VE.getTypeID(I.getType()));
806 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
807 Vals.push_back(Log2_32(cast<AllocaInst>(I).getAlignment())+1);
810 case Instruction::Load:
811 Code = bitc::FUNC_CODE_INST_LOAD;
812 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
813 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
815 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
816 Vals.push_back(cast<LoadInst>(I).isVolatile());
818 case Instruction::Store:
819 Code = bitc::FUNC_CODE_INST_STORE;
820 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // val.
821 Vals.push_back(VE.getValueID(I.getOperand(1))); // ptr.
822 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
823 Vals.push_back(cast<StoreInst>(I).isVolatile());
825 case Instruction::Call: {
826 const PointerType *PTy = cast<PointerType>(I.getOperand(0)->getType());
827 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
829 Code = bitc::FUNC_CODE_INST_CALL;
831 const CallInst *CI = cast<CallInst>(&I);
832 Vals.push_back(VE.getParamAttrID(CI->getParamAttrs()));
833 Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall()));
834 PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee
836 // Emit value #'s for the fixed parameters.
837 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
838 Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param.
840 // Emit type/value pairs for varargs params.
841 if (FTy->isVarArg()) {
842 unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams();
843 for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands();
845 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs
849 case Instruction::VAArg:
850 Code = bitc::FUNC_CODE_INST_VAARG;
851 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
852 Vals.push_back(VE.getValueID(I.getOperand(0))); // valist.
853 Vals.push_back(VE.getTypeID(I.getType())); // restype.
857 Stream.EmitRecord(Code, Vals, AbbrevToUse);
861 // Emit names for globals/functions etc.
862 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
863 const ValueEnumerator &VE,
864 BitstreamWriter &Stream) {
865 if (VST.empty()) return;
866 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
868 // FIXME: Set up the abbrev, we know how many values there are!
869 // FIXME: We know if the type names can use 7-bit ascii.
870 SmallVector<unsigned, 64> NameVals;
872 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
875 const ValueName &Name = *SI;
877 // Figure out the encoding to use for the name.
880 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
883 isChar6 = BitCodeAbbrevOp::isChar6(*C);
884 if ((unsigned char)*C & 128) {
886 break; // don't bother scanning the rest.
890 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
892 // VST_ENTRY: [valueid, namechar x N]
893 // VST_BBENTRY: [bbid, namechar x N]
895 if (isa<BasicBlock>(SI->getValue())) {
896 Code = bitc::VST_CODE_BBENTRY;
898 AbbrevToUse = VST_BBENTRY_6_ABBREV;
900 Code = bitc::VST_CODE_ENTRY;
902 AbbrevToUse = VST_ENTRY_6_ABBREV;
904 AbbrevToUse = VST_ENTRY_7_ABBREV;
907 NameVals.push_back(VE.getValueID(SI->getValue()));
908 for (const char *P = Name.getKeyData(),
909 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
910 NameVals.push_back((unsigned char)*P);
912 // Emit the finished record.
913 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
919 /// WriteFunction - Emit a function body to the module stream.
920 static void WriteFunction(const Function &F, ValueEnumerator &VE,
921 BitstreamWriter &Stream) {
922 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
923 VE.incorporateFunction(F);
925 SmallVector<unsigned, 64> Vals;
927 // Emit the number of basic blocks, so the reader can create them ahead of
929 Vals.push_back(VE.getBasicBlocks().size());
930 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
933 // If there are function-local constants, emit them now.
934 unsigned CstStart, CstEnd;
935 VE.getFunctionConstantRange(CstStart, CstEnd);
936 WriteConstants(CstStart, CstEnd, VE, Stream, false);
938 // Keep a running idea of what the instruction ID is.
939 unsigned InstID = CstEnd;
941 // Finally, emit all the instructions, in order.
942 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
943 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
945 WriteInstruction(*I, InstID, VE, Stream, Vals);
946 if (I->getType() != Type::VoidTy)
950 // Emit names for all the instructions etc.
951 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
957 /// WriteTypeSymbolTable - Emit a block for the specified type symtab.
958 static void WriteTypeSymbolTable(const TypeSymbolTable &TST,
959 const ValueEnumerator &VE,
960 BitstreamWriter &Stream) {
961 if (TST.empty()) return;
963 Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3);
965 // 7-bit fixed width VST_CODE_ENTRY strings.
966 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
967 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
968 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
969 Log2_32_Ceil(VE.getTypes().size()+1)));
970 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
971 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
972 unsigned V7Abbrev = Stream.EmitAbbrev(Abbv);
974 SmallVector<unsigned, 64> NameVals;
976 for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end();
978 // TST_ENTRY: [typeid, namechar x N]
979 NameVals.push_back(VE.getTypeID(TI->second));
981 const std::string &Str = TI->first;
983 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
984 NameVals.push_back((unsigned char)Str[i]);
989 // Emit the finished record.
990 Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0);
997 // Emit blockinfo, which defines the standard abbreviations etc.
998 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
999 // We only want to emit block info records for blocks that have multiple
1000 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other
1001 // blocks can defined their abbrevs inline.
1002 Stream.EnterBlockInfoBlock(2);
1004 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1005 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1006 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1007 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1008 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1009 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1010 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1011 Abbv) != VST_ENTRY_8_ABBREV)
1012 assert(0 && "Unexpected abbrev ordering!");
1015 { // 7-bit fixed width VST_ENTRY strings.
1016 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1017 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1018 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1019 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1020 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1021 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1022 Abbv) != VST_ENTRY_7_ABBREV)
1023 assert(0 && "Unexpected abbrev ordering!");
1025 { // 6-bit char6 VST_ENTRY strings.
1026 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1027 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1028 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1029 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1030 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1031 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1032 Abbv) != VST_ENTRY_6_ABBREV)
1033 assert(0 && "Unexpected abbrev ordering!");
1035 { // 6-bit char6 VST_BBENTRY strings.
1036 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1037 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1038 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1039 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1040 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1041 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1042 Abbv) != VST_BBENTRY_6_ABBREV)
1043 assert(0 && "Unexpected abbrev ordering!");
1048 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1049 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1050 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1051 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1052 Log2_32_Ceil(VE.getTypes().size()+1)));
1053 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1054 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1055 assert(0 && "Unexpected abbrev ordering!");
1058 { // INTEGER abbrev for CONSTANTS_BLOCK.
1059 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1060 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1061 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1062 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1063 Abbv) != CONSTANTS_INTEGER_ABBREV)
1064 assert(0 && "Unexpected abbrev ordering!");
1067 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1068 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1069 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1070 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1071 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1072 Log2_32_Ceil(VE.getTypes().size()+1)));
1073 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1075 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1076 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1077 assert(0 && "Unexpected abbrev ordering!");
1079 { // NULL abbrev for CONSTANTS_BLOCK.
1080 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1081 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1082 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1083 Abbv) != CONSTANTS_NULL_Abbrev)
1084 assert(0 && "Unexpected abbrev ordering!");
1087 // FIXME: This should only use space for first class types!
1089 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1090 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1091 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1092 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1093 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1094 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1095 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1096 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1097 assert(0 && "Unexpected abbrev ordering!");
1099 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1100 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1101 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1102 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1103 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1104 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1105 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1106 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1107 assert(0 && "Unexpected abbrev ordering!");
1109 { // INST_CAST abbrev for FUNCTION_BLOCK.
1110 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1111 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1112 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1113 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1114 Log2_32_Ceil(VE.getTypes().size()+1)));
1115 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1116 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1117 Abbv) != FUNCTION_INST_CAST_ABBREV)
1118 assert(0 && "Unexpected abbrev ordering!");
1121 { // INST_RET abbrev for FUNCTION_BLOCK.
1122 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1123 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1124 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1125 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1126 assert(0 && "Unexpected abbrev ordering!");
1128 { // INST_RET abbrev for FUNCTION_BLOCK.
1129 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1130 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1131 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1132 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1133 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1134 assert(0 && "Unexpected abbrev ordering!");
1136 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1137 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1138 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1139 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1140 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1141 assert(0 && "Unexpected abbrev ordering!");
1148 /// WriteModule - Emit the specified module to the bitstream.
1149 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1150 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1152 // Emit the version number if it is non-zero.
1154 SmallVector<unsigned, 1> Vals;
1155 Vals.push_back(CurVersion);
1156 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1159 // Analyze the module, enumerating globals, functions, etc.
1160 ValueEnumerator VE(M);
1162 // Emit blockinfo, which defines the standard abbreviations etc.
1163 WriteBlockInfo(VE, Stream);
1165 // Emit information about parameter attributes.
1166 WriteParamAttrTable(VE, Stream);
1168 // Emit information describing all of the types in the module.
1169 WriteTypeTable(VE, Stream);
1171 // Emit top-level description of module, including target triple, inline asm,
1172 // descriptors for global variables, and function prototype info.
1173 WriteModuleInfo(M, VE, Stream);
1176 WriteModuleConstants(VE, Stream);
1178 // If we have any aggregate values in the value table, purge them - these can
1179 // only be used to initialize global variables. Doing so makes the value
1180 // namespace smaller for code in functions.
1181 int NumNonAggregates = VE.PurgeAggregateValues();
1182 if (NumNonAggregates != -1) {
1183 SmallVector<unsigned, 1> Vals;
1184 Vals.push_back(NumNonAggregates);
1185 Stream.EmitRecord(bitc::MODULE_CODE_PURGEVALS, Vals);
1188 // Emit function bodies.
1189 for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
1190 if (!I->isDeclaration())
1191 WriteFunction(*I, VE, Stream);
1193 // Emit the type symbol table information.
1194 WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream);
1196 // Emit names for globals/functions etc.
1197 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1203 /// WriteBitcodeToFile - Write the specified module to the specified output
1205 void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) {
1206 std::vector<unsigned char> Buffer;
1207 BitstreamWriter Stream(Buffer);
1209 Buffer.reserve(256*1024);
1211 // Emit the file header.
1212 Stream.Emit((unsigned)'B', 8);
1213 Stream.Emit((unsigned)'C', 8);
1214 Stream.Emit(0x0, 4);
1215 Stream.Emit(0xC, 4);
1216 Stream.Emit(0xE, 4);
1217 Stream.Emit(0xD, 4);
1220 WriteModule(M, Stream);
1222 // Write the generated bitstream to "Out".
1223 Out.write((char*)&Buffer.front(), Buffer.size());
1225 // Make sure it hits disk now.