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 "ValueEnumerator.h"
16 #include "llvm/ADT/Triple.h"
17 #include "llvm/Bitcode/BitstreamWriter.h"
18 #include "llvm/Bitcode/LLVMBitCodes.h"
19 #include "llvm/IR/Constants.h"
20 #include "llvm/IR/DerivedTypes.h"
21 #include "llvm/IR/InlineAsm.h"
22 #include "llvm/IR/Instructions.h"
23 #include "llvm/IR/Module.h"
24 #include "llvm/IR/Operator.h"
25 #include "llvm/IR/UseListOrder.h"
26 #include "llvm/IR/ValueSymbolTable.h"
27 #include "llvm/Support/CommandLine.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/Program.h"
31 #include "llvm/Support/raw_ostream.h"
36 /// These are manifest constants used by the bitcode writer. They do not need to
37 /// be kept in sync with the reader, but need to be consistent within this file.
39 // VALUE_SYMTAB_BLOCK abbrev id's.
40 VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
45 // CONSTANTS_BLOCK abbrev id's.
46 CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
47 CONSTANTS_INTEGER_ABBREV,
48 CONSTANTS_CE_CAST_Abbrev,
49 CONSTANTS_NULL_Abbrev,
51 // FUNCTION_BLOCK abbrev id's.
52 FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
53 FUNCTION_INST_BINOP_ABBREV,
54 FUNCTION_INST_BINOP_FLAGS_ABBREV,
55 FUNCTION_INST_CAST_ABBREV,
56 FUNCTION_INST_RET_VOID_ABBREV,
57 FUNCTION_INST_RET_VAL_ABBREV,
58 FUNCTION_INST_UNREACHABLE_ABBREV
61 static unsigned GetEncodedCastOpcode(unsigned Opcode) {
63 default: llvm_unreachable("Unknown cast instruction!");
64 case Instruction::Trunc : return bitc::CAST_TRUNC;
65 case Instruction::ZExt : return bitc::CAST_ZEXT;
66 case Instruction::SExt : return bitc::CAST_SEXT;
67 case Instruction::FPToUI : return bitc::CAST_FPTOUI;
68 case Instruction::FPToSI : return bitc::CAST_FPTOSI;
69 case Instruction::UIToFP : return bitc::CAST_UITOFP;
70 case Instruction::SIToFP : return bitc::CAST_SITOFP;
71 case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
72 case Instruction::FPExt : return bitc::CAST_FPEXT;
73 case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
74 case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
75 case Instruction::BitCast : return bitc::CAST_BITCAST;
76 case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST;
80 static unsigned GetEncodedBinaryOpcode(unsigned Opcode) {
82 default: llvm_unreachable("Unknown binary instruction!");
83 case Instruction::Add:
84 case Instruction::FAdd: return bitc::BINOP_ADD;
85 case Instruction::Sub:
86 case Instruction::FSub: return bitc::BINOP_SUB;
87 case Instruction::Mul:
88 case Instruction::FMul: return bitc::BINOP_MUL;
89 case Instruction::UDiv: return bitc::BINOP_UDIV;
90 case Instruction::FDiv:
91 case Instruction::SDiv: return bitc::BINOP_SDIV;
92 case Instruction::URem: return bitc::BINOP_UREM;
93 case Instruction::FRem:
94 case Instruction::SRem: return bitc::BINOP_SREM;
95 case Instruction::Shl: return bitc::BINOP_SHL;
96 case Instruction::LShr: return bitc::BINOP_LSHR;
97 case Instruction::AShr: return bitc::BINOP_ASHR;
98 case Instruction::And: return bitc::BINOP_AND;
99 case Instruction::Or: return bitc::BINOP_OR;
100 case Instruction::Xor: return bitc::BINOP_XOR;
104 static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) {
106 default: llvm_unreachable("Unknown RMW operation!");
107 case AtomicRMWInst::Xchg: return bitc::RMW_XCHG;
108 case AtomicRMWInst::Add: return bitc::RMW_ADD;
109 case AtomicRMWInst::Sub: return bitc::RMW_SUB;
110 case AtomicRMWInst::And: return bitc::RMW_AND;
111 case AtomicRMWInst::Nand: return bitc::RMW_NAND;
112 case AtomicRMWInst::Or: return bitc::RMW_OR;
113 case AtomicRMWInst::Xor: return bitc::RMW_XOR;
114 case AtomicRMWInst::Max: return bitc::RMW_MAX;
115 case AtomicRMWInst::Min: return bitc::RMW_MIN;
116 case AtomicRMWInst::UMax: return bitc::RMW_UMAX;
117 case AtomicRMWInst::UMin: return bitc::RMW_UMIN;
121 static unsigned GetEncodedOrdering(AtomicOrdering Ordering) {
123 case NotAtomic: return bitc::ORDERING_NOTATOMIC;
124 case Unordered: return bitc::ORDERING_UNORDERED;
125 case Monotonic: return bitc::ORDERING_MONOTONIC;
126 case Acquire: return bitc::ORDERING_ACQUIRE;
127 case Release: return bitc::ORDERING_RELEASE;
128 case AcquireRelease: return bitc::ORDERING_ACQREL;
129 case SequentiallyConsistent: return bitc::ORDERING_SEQCST;
131 llvm_unreachable("Invalid ordering");
134 static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) {
135 switch (SynchScope) {
136 case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD;
137 case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD;
139 llvm_unreachable("Invalid synch scope");
142 static void WriteStringRecord(unsigned Code, StringRef Str,
143 unsigned AbbrevToUse, BitstreamWriter &Stream) {
144 SmallVector<unsigned, 64> Vals;
146 // Code: [strchar x N]
147 for (unsigned i = 0, e = Str.size(); i != e; ++i) {
148 if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i]))
150 Vals.push_back(Str[i]);
153 // Emit the finished record.
154 Stream.EmitRecord(Code, Vals, AbbrevToUse);
157 static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
159 case Attribute::Alignment:
160 return bitc::ATTR_KIND_ALIGNMENT;
161 case Attribute::AlwaysInline:
162 return bitc::ATTR_KIND_ALWAYS_INLINE;
163 case Attribute::Builtin:
164 return bitc::ATTR_KIND_BUILTIN;
165 case Attribute::ByVal:
166 return bitc::ATTR_KIND_BY_VAL;
167 case Attribute::InAlloca:
168 return bitc::ATTR_KIND_IN_ALLOCA;
169 case Attribute::Cold:
170 return bitc::ATTR_KIND_COLD;
171 case Attribute::InlineHint:
172 return bitc::ATTR_KIND_INLINE_HINT;
173 case Attribute::InReg:
174 return bitc::ATTR_KIND_IN_REG;
175 case Attribute::JumpTable:
176 return bitc::ATTR_KIND_JUMP_TABLE;
177 case Attribute::MinSize:
178 return bitc::ATTR_KIND_MIN_SIZE;
179 case Attribute::Naked:
180 return bitc::ATTR_KIND_NAKED;
181 case Attribute::Nest:
182 return bitc::ATTR_KIND_NEST;
183 case Attribute::NoAlias:
184 return bitc::ATTR_KIND_NO_ALIAS;
185 case Attribute::NoBuiltin:
186 return bitc::ATTR_KIND_NO_BUILTIN;
187 case Attribute::NoCapture:
188 return bitc::ATTR_KIND_NO_CAPTURE;
189 case Attribute::NoDuplicate:
190 return bitc::ATTR_KIND_NO_DUPLICATE;
191 case Attribute::NoImplicitFloat:
192 return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT;
193 case Attribute::NoInline:
194 return bitc::ATTR_KIND_NO_INLINE;
195 case Attribute::NonLazyBind:
196 return bitc::ATTR_KIND_NON_LAZY_BIND;
197 case Attribute::NonNull:
198 return bitc::ATTR_KIND_NON_NULL;
199 case Attribute::Dereferenceable:
200 return bitc::ATTR_KIND_DEREFERENCEABLE;
201 case Attribute::NoRedZone:
202 return bitc::ATTR_KIND_NO_RED_ZONE;
203 case Attribute::NoReturn:
204 return bitc::ATTR_KIND_NO_RETURN;
205 case Attribute::NoUnwind:
206 return bitc::ATTR_KIND_NO_UNWIND;
207 case Attribute::OptimizeForSize:
208 return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE;
209 case Attribute::OptimizeNone:
210 return bitc::ATTR_KIND_OPTIMIZE_NONE;
211 case Attribute::ReadNone:
212 return bitc::ATTR_KIND_READ_NONE;
213 case Attribute::ReadOnly:
214 return bitc::ATTR_KIND_READ_ONLY;
215 case Attribute::Returned:
216 return bitc::ATTR_KIND_RETURNED;
217 case Attribute::ReturnsTwice:
218 return bitc::ATTR_KIND_RETURNS_TWICE;
219 case Attribute::SExt:
220 return bitc::ATTR_KIND_S_EXT;
221 case Attribute::StackAlignment:
222 return bitc::ATTR_KIND_STACK_ALIGNMENT;
223 case Attribute::StackProtect:
224 return bitc::ATTR_KIND_STACK_PROTECT;
225 case Attribute::StackProtectReq:
226 return bitc::ATTR_KIND_STACK_PROTECT_REQ;
227 case Attribute::StackProtectStrong:
228 return bitc::ATTR_KIND_STACK_PROTECT_STRONG;
229 case Attribute::StructRet:
230 return bitc::ATTR_KIND_STRUCT_RET;
231 case Attribute::SanitizeAddress:
232 return bitc::ATTR_KIND_SANITIZE_ADDRESS;
233 case Attribute::SanitizeThread:
234 return bitc::ATTR_KIND_SANITIZE_THREAD;
235 case Attribute::SanitizeMemory:
236 return bitc::ATTR_KIND_SANITIZE_MEMORY;
237 case Attribute::UWTable:
238 return bitc::ATTR_KIND_UW_TABLE;
239 case Attribute::ZExt:
240 return bitc::ATTR_KIND_Z_EXT;
241 case Attribute::EndAttrKinds:
242 llvm_unreachable("Can not encode end-attribute kinds marker.");
243 case Attribute::None:
244 llvm_unreachable("Can not encode none-attribute.");
247 llvm_unreachable("Trying to encode unknown attribute");
250 static void WriteAttributeGroupTable(const ValueEnumerator &VE,
251 BitstreamWriter &Stream) {
252 const std::vector<AttributeSet> &AttrGrps = VE.getAttributeGroups();
253 if (AttrGrps.empty()) return;
255 Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
257 SmallVector<uint64_t, 64> Record;
258 for (unsigned i = 0, e = AttrGrps.size(); i != e; ++i) {
259 AttributeSet AS = AttrGrps[i];
260 for (unsigned i = 0, e = AS.getNumSlots(); i != e; ++i) {
261 AttributeSet A = AS.getSlotAttributes(i);
263 Record.push_back(VE.getAttributeGroupID(A));
264 Record.push_back(AS.getSlotIndex(i));
266 for (AttributeSet::iterator I = AS.begin(0), E = AS.end(0);
269 if (Attr.isEnumAttribute()) {
271 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
272 } else if (Attr.isIntAttribute()) {
274 Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
275 Record.push_back(Attr.getValueAsInt());
277 StringRef Kind = Attr.getKindAsString();
278 StringRef Val = Attr.getValueAsString();
280 Record.push_back(Val.empty() ? 3 : 4);
281 Record.append(Kind.begin(), Kind.end());
284 Record.append(Val.begin(), Val.end());
290 Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
298 static void WriteAttributeTable(const ValueEnumerator &VE,
299 BitstreamWriter &Stream) {
300 const std::vector<AttributeSet> &Attrs = VE.getAttributes();
301 if (Attrs.empty()) return;
303 Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
305 SmallVector<uint64_t, 64> Record;
306 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
307 const AttributeSet &A = Attrs[i];
308 for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i)
309 Record.push_back(VE.getAttributeGroupID(A.getSlotAttributes(i)));
311 Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
318 /// WriteTypeTable - Write out the type table for a module.
319 static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
320 const ValueEnumerator::TypeList &TypeList = VE.getTypes();
322 Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
323 SmallVector<uint64_t, 64> TypeVals;
325 uint64_t NumBits = Log2_32_Ceil(VE.getTypes().size()+1);
327 // Abbrev for TYPE_CODE_POINTER.
328 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
329 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
330 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
331 Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
332 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
334 // Abbrev for TYPE_CODE_FUNCTION.
335 Abbv = new BitCodeAbbrev();
336 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
337 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
338 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
339 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
341 unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
343 // Abbrev for TYPE_CODE_STRUCT_ANON.
344 Abbv = new BitCodeAbbrev();
345 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON));
346 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
347 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
348 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
350 unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv);
352 // Abbrev for TYPE_CODE_STRUCT_NAME.
353 Abbv = new BitCodeAbbrev();
354 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
355 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
356 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
357 unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv);
359 // Abbrev for TYPE_CODE_STRUCT_NAMED.
360 Abbv = new BitCodeAbbrev();
361 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED));
362 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
363 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
364 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
366 unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv);
368 // Abbrev for TYPE_CODE_ARRAY.
369 Abbv = new BitCodeAbbrev();
370 Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
371 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
372 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
374 unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
376 // Emit an entry count so the reader can reserve space.
377 TypeVals.push_back(TypeList.size());
378 Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
381 // Loop over all of the types, emitting each in turn.
382 for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
383 Type *T = TypeList[i];
387 switch (T->getTypeID()) {
388 case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
389 case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; break;
390 case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break;
391 case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break;
392 case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break;
393 case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break;
394 case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
395 case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break;
396 case Type::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
397 case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break;
398 case Type::IntegerTyID:
400 Code = bitc::TYPE_CODE_INTEGER;
401 TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
403 case Type::PointerTyID: {
404 PointerType *PTy = cast<PointerType>(T);
405 // POINTER: [pointee type, address space]
406 Code = bitc::TYPE_CODE_POINTER;
407 TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
408 unsigned AddressSpace = PTy->getAddressSpace();
409 TypeVals.push_back(AddressSpace);
410 if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
413 case Type::FunctionTyID: {
414 FunctionType *FT = cast<FunctionType>(T);
415 // FUNCTION: [isvararg, retty, paramty x N]
416 Code = bitc::TYPE_CODE_FUNCTION;
417 TypeVals.push_back(FT->isVarArg());
418 TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
419 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
420 TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
421 AbbrevToUse = FunctionAbbrev;
424 case Type::StructTyID: {
425 StructType *ST = cast<StructType>(T);
426 // STRUCT: [ispacked, eltty x N]
427 TypeVals.push_back(ST->isPacked());
428 // Output all of the element types.
429 for (StructType::element_iterator I = ST->element_begin(),
430 E = ST->element_end(); I != E; ++I)
431 TypeVals.push_back(VE.getTypeID(*I));
433 if (ST->isLiteral()) {
434 Code = bitc::TYPE_CODE_STRUCT_ANON;
435 AbbrevToUse = StructAnonAbbrev;
437 if (ST->isOpaque()) {
438 Code = bitc::TYPE_CODE_OPAQUE;
440 Code = bitc::TYPE_CODE_STRUCT_NAMED;
441 AbbrevToUse = StructNamedAbbrev;
444 // Emit the name if it is present.
445 if (!ST->getName().empty())
446 WriteStringRecord(bitc::TYPE_CODE_STRUCT_NAME, ST->getName(),
447 StructNameAbbrev, Stream);
451 case Type::ArrayTyID: {
452 ArrayType *AT = cast<ArrayType>(T);
453 // ARRAY: [numelts, eltty]
454 Code = bitc::TYPE_CODE_ARRAY;
455 TypeVals.push_back(AT->getNumElements());
456 TypeVals.push_back(VE.getTypeID(AT->getElementType()));
457 AbbrevToUse = ArrayAbbrev;
460 case Type::VectorTyID: {
461 VectorType *VT = cast<VectorType>(T);
462 // VECTOR [numelts, eltty]
463 Code = bitc::TYPE_CODE_VECTOR;
464 TypeVals.push_back(VT->getNumElements());
465 TypeVals.push_back(VE.getTypeID(VT->getElementType()));
470 // Emit the finished record.
471 Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
478 static unsigned getEncodedLinkage(const GlobalValue &GV) {
479 switch (GV.getLinkage()) {
480 case GlobalValue::ExternalLinkage: return 0;
481 case GlobalValue::WeakAnyLinkage: return 1;
482 case GlobalValue::AppendingLinkage: return 2;
483 case GlobalValue::InternalLinkage: return 3;
484 case GlobalValue::LinkOnceAnyLinkage: return 4;
485 case GlobalValue::ExternalWeakLinkage: return 7;
486 case GlobalValue::CommonLinkage: return 8;
487 case GlobalValue::PrivateLinkage: return 9;
488 case GlobalValue::WeakODRLinkage: return 10;
489 case GlobalValue::LinkOnceODRLinkage: return 11;
490 case GlobalValue::AvailableExternallyLinkage: return 12;
492 llvm_unreachable("Invalid linkage");
495 static unsigned getEncodedVisibility(const GlobalValue &GV) {
496 switch (GV.getVisibility()) {
497 case GlobalValue::DefaultVisibility: return 0;
498 case GlobalValue::HiddenVisibility: return 1;
499 case GlobalValue::ProtectedVisibility: return 2;
501 llvm_unreachable("Invalid visibility");
504 static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) {
505 switch (GV.getDLLStorageClass()) {
506 case GlobalValue::DefaultStorageClass: return 0;
507 case GlobalValue::DLLImportStorageClass: return 1;
508 case GlobalValue::DLLExportStorageClass: return 2;
510 llvm_unreachable("Invalid DLL storage class");
513 static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) {
514 switch (GV.getThreadLocalMode()) {
515 case GlobalVariable::NotThreadLocal: return 0;
516 case GlobalVariable::GeneralDynamicTLSModel: return 1;
517 case GlobalVariable::LocalDynamicTLSModel: return 2;
518 case GlobalVariable::InitialExecTLSModel: return 3;
519 case GlobalVariable::LocalExecTLSModel: return 4;
521 llvm_unreachable("Invalid TLS model");
524 static unsigned getEncodedComdatSelectionKind(const Comdat &C) {
525 switch (C.getSelectionKind()) {
527 return bitc::COMDAT_SELECTION_KIND_ANY;
528 case Comdat::ExactMatch:
529 return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH;
530 case Comdat::Largest:
531 return bitc::COMDAT_SELECTION_KIND_LARGEST;
532 case Comdat::NoDuplicates:
533 return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES;
534 case Comdat::SameSize:
535 return bitc::COMDAT_SELECTION_KIND_SAME_SIZE;
537 llvm_unreachable("Invalid selection kind");
540 static void writeComdats(const ValueEnumerator &VE, BitstreamWriter &Stream) {
541 SmallVector<uint8_t, 64> Vals;
542 for (const Comdat *C : VE.getComdats()) {
543 // COMDAT: [selection_kind, name]
544 Vals.push_back(getEncodedComdatSelectionKind(*C));
545 Vals.push_back(C->getName().size());
546 for (char Chr : C->getName())
547 Vals.push_back((unsigned char)Chr);
548 Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
553 // Emit top-level description of module, including target triple, inline asm,
554 // descriptors for global variables, and function prototype info.
555 static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
556 BitstreamWriter &Stream) {
557 // Emit various pieces of data attached to a module.
558 if (!M->getTargetTriple().empty())
559 WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
561 const std::string &DL = M->getDataLayoutStr();
563 WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/, Stream);
564 if (!M->getModuleInlineAsm().empty())
565 WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
568 // Emit information about sections and GC, computing how many there are. Also
569 // compute the maximum alignment value.
570 std::map<std::string, unsigned> SectionMap;
571 std::map<std::string, unsigned> GCMap;
572 unsigned MaxAlignment = 0;
573 unsigned MaxGlobalType = 0;
574 for (const GlobalValue &GV : M->globals()) {
575 MaxAlignment = std::max(MaxAlignment, GV.getAlignment());
576 MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getType()));
577 if (GV.hasSection()) {
578 // Give section names unique ID's.
579 unsigned &Entry = SectionMap[GV.getSection()];
581 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV.getSection(),
583 Entry = SectionMap.size();
587 for (const Function &F : *M) {
588 MaxAlignment = std::max(MaxAlignment, F.getAlignment());
589 if (F.hasSection()) {
590 // Give section names unique ID's.
591 unsigned &Entry = SectionMap[F.getSection()];
593 WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F.getSection(),
595 Entry = SectionMap.size();
599 // Same for GC names.
600 unsigned &Entry = GCMap[F.getGC()];
602 WriteStringRecord(bitc::MODULE_CODE_GCNAME, F.getGC(),
604 Entry = GCMap.size();
609 // Emit abbrev for globals, now that we know # sections and max alignment.
610 unsigned SimpleGVarAbbrev = 0;
611 if (!M->global_empty()) {
612 // Add an abbrev for common globals with no visibility or thread localness.
613 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
614 Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
615 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
616 Log2_32_Ceil(MaxGlobalType+1)));
617 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
618 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
619 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage.
620 if (MaxAlignment == 0) // Alignment.
621 Abbv->Add(BitCodeAbbrevOp(0));
623 unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
624 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
625 Log2_32_Ceil(MaxEncAlignment+1)));
627 if (SectionMap.empty()) // Section.
628 Abbv->Add(BitCodeAbbrevOp(0));
630 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
631 Log2_32_Ceil(SectionMap.size()+1)));
632 // Don't bother emitting vis + thread local.
633 SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
636 // Emit the global variable information.
637 SmallVector<unsigned, 64> Vals;
638 for (const GlobalVariable &GV : M->globals()) {
639 unsigned AbbrevToUse = 0;
641 // GLOBALVAR: [type, isconst, initid,
642 // linkage, alignment, section, visibility, threadlocal,
643 // unnamed_addr, externally_initialized, dllstorageclass]
644 Vals.push_back(VE.getTypeID(GV.getType()));
645 Vals.push_back(GV.isConstant());
646 Vals.push_back(GV.isDeclaration() ? 0 :
647 (VE.getValueID(GV.getInitializer()) + 1));
648 Vals.push_back(getEncodedLinkage(GV));
649 Vals.push_back(Log2_32(GV.getAlignment())+1);
650 Vals.push_back(GV.hasSection() ? SectionMap[GV.getSection()] : 0);
651 if (GV.isThreadLocal() ||
652 GV.getVisibility() != GlobalValue::DefaultVisibility ||
653 GV.hasUnnamedAddr() || GV.isExternallyInitialized() ||
654 GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass ||
656 Vals.push_back(getEncodedVisibility(GV));
657 Vals.push_back(getEncodedThreadLocalMode(GV));
658 Vals.push_back(GV.hasUnnamedAddr());
659 Vals.push_back(GV.isExternallyInitialized());
660 Vals.push_back(getEncodedDLLStorageClass(GV));
661 Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0);
663 AbbrevToUse = SimpleGVarAbbrev;
666 Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
670 // Emit the function proto information.
671 for (const Function &F : *M) {
672 // FUNCTION: [type, callingconv, isproto, linkage, paramattrs, alignment,
673 // section, visibility, gc, unnamed_addr, prologuedata,
674 // dllstorageclass, comdat, prefixdata]
675 Vals.push_back(VE.getTypeID(F.getType()));
676 Vals.push_back(F.getCallingConv());
677 Vals.push_back(F.isDeclaration());
678 Vals.push_back(getEncodedLinkage(F));
679 Vals.push_back(VE.getAttributeID(F.getAttributes()));
680 Vals.push_back(Log2_32(F.getAlignment())+1);
681 Vals.push_back(F.hasSection() ? SectionMap[F.getSection()] : 0);
682 Vals.push_back(getEncodedVisibility(F));
683 Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0);
684 Vals.push_back(F.hasUnnamedAddr());
685 Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1)
687 Vals.push_back(getEncodedDLLStorageClass(F));
688 Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0);
689 Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1)
692 unsigned AbbrevToUse = 0;
693 Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
697 // Emit the alias information.
698 for (const GlobalAlias &A : M->aliases()) {
699 // ALIAS: [alias type, aliasee val#, linkage, visibility]
700 Vals.push_back(VE.getTypeID(A.getType()));
701 Vals.push_back(VE.getValueID(A.getAliasee()));
702 Vals.push_back(getEncodedLinkage(A));
703 Vals.push_back(getEncodedVisibility(A));
704 Vals.push_back(getEncodedDLLStorageClass(A));
705 Vals.push_back(getEncodedThreadLocalMode(A));
706 Vals.push_back(A.hasUnnamedAddr());
707 unsigned AbbrevToUse = 0;
708 Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
713 static uint64_t GetOptimizationFlags(const Value *V) {
716 if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) {
717 if (OBO->hasNoSignedWrap())
718 Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
719 if (OBO->hasNoUnsignedWrap())
720 Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
721 } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) {
723 Flags |= 1 << bitc::PEO_EXACT;
724 } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) {
725 if (FPMO->hasUnsafeAlgebra())
726 Flags |= FastMathFlags::UnsafeAlgebra;
727 if (FPMO->hasNoNaNs())
728 Flags |= FastMathFlags::NoNaNs;
729 if (FPMO->hasNoInfs())
730 Flags |= FastMathFlags::NoInfs;
731 if (FPMO->hasNoSignedZeros())
732 Flags |= FastMathFlags::NoSignedZeros;
733 if (FPMO->hasAllowReciprocal())
734 Flags |= FastMathFlags::AllowReciprocal;
740 static void WriteValueAsMetadataImpl(const ValueAsMetadata *MD,
741 const ValueEnumerator &VE,
742 BitstreamWriter &Stream,
743 SmallVectorImpl<uint64_t> &Record,
745 // Mimic an MDNode with a value as one operand.
746 Value *V = MD->getValue();
747 Record.push_back(VE.getTypeID(V->getType()));
748 Record.push_back(VE.getValueID(V));
749 Stream.EmitRecord(Code, Record, 0);
753 static void WriteLocalAsMetadata(const LocalAsMetadata *MD,
754 const ValueEnumerator &VE,
755 BitstreamWriter &Stream,
756 SmallVectorImpl<uint64_t> &Record) {
757 WriteValueAsMetadataImpl(MD, VE, Stream, Record, bitc::METADATA_OLD_FN_NODE);
760 static void WriteConstantAsMetadata(const ConstantAsMetadata *MD,
761 const ValueEnumerator &VE,
762 BitstreamWriter &Stream,
763 SmallVectorImpl<uint64_t> &Record) {
764 WriteValueAsMetadataImpl(MD, VE, Stream, Record, bitc::METADATA_OLD_NODE);
767 static void WriteMDNode(const MDNode *N,
768 const ValueEnumerator &VE,
769 BitstreamWriter &Stream,
770 SmallVectorImpl<uint64_t> &Record) {
771 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
772 Metadata *MD = N->getOperand(i);
774 Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
778 if (auto *V = dyn_cast<ConstantAsMetadata>(MD)) {
779 Record.push_back(VE.getTypeID(V->getValue()->getType()));
780 Record.push_back(VE.getValueID(V->getValue()));
783 assert(!isa<LocalAsMetadata>(MD) && "Unexpected function-local metadata");
784 Record.push_back(VE.getTypeID(Type::getMetadataTy(N->getContext())));
785 Record.push_back(VE.getMetadataID(MD));
787 Stream.EmitRecord(bitc::METADATA_OLD_NODE, Record, 0);
791 static void WriteModuleMetadata(const Module *M,
792 const ValueEnumerator &VE,
793 BitstreamWriter &Stream) {
794 const auto &MDs = VE.getMDs();
795 bool StartedMetadataBlock = false;
796 unsigned MDSAbbrev = 0;
797 SmallVector<uint64_t, 64> Record;
798 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
799 if (const MDNode *N = dyn_cast<MDNode>(MDs[i])) {
800 if (!StartedMetadataBlock) {
801 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
802 StartedMetadataBlock = true;
804 WriteMDNode(N, VE, Stream, Record);
805 } else if (const auto *MDC = dyn_cast<ConstantAsMetadata>(MDs[i])) {
806 if (!StartedMetadataBlock) {
807 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
808 StartedMetadataBlock = true;
810 WriteConstantAsMetadata(MDC, VE, Stream, Record);
811 } else if (const MDString *MDS = dyn_cast<MDString>(MDs[i])) {
812 if (!StartedMetadataBlock) {
813 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
815 // Abbrev for METADATA_STRING.
816 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
817 Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
818 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
819 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
820 MDSAbbrev = Stream.EmitAbbrev(Abbv);
821 StartedMetadataBlock = true;
824 // Code: [strchar x N]
825 Record.append(MDS->begin(), MDS->end());
827 // Emit the finished record.
828 Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
833 // Write named metadata.
834 for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
835 E = M->named_metadata_end(); I != E; ++I) {
836 const NamedMDNode *NMD = I;
837 if (!StartedMetadataBlock) {
838 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
839 StartedMetadataBlock = true;
843 StringRef Str = NMD->getName();
844 for (unsigned i = 0, e = Str.size(); i != e; ++i)
845 Record.push_back(Str[i]);
846 Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
849 // Write named metadata operands.
850 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
851 Record.push_back(VE.getMetadataID(NMD->getOperand(i)));
852 Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
856 if (StartedMetadataBlock)
860 static void WriteFunctionLocalMetadata(const Function &F,
861 const ValueEnumerator &VE,
862 BitstreamWriter &Stream) {
863 bool StartedMetadataBlock = false;
864 SmallVector<uint64_t, 64> Record;
865 const SmallVectorImpl<const LocalAsMetadata *> &MDs =
866 VE.getFunctionLocalMDs();
867 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
868 assert(MDs[i] && "Expected valid function-local metadata");
869 if (!StartedMetadataBlock) {
870 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
871 StartedMetadataBlock = true;
873 WriteLocalAsMetadata(MDs[i], VE, Stream, Record);
876 if (StartedMetadataBlock)
880 static void WriteMetadataAttachment(const Function &F,
881 const ValueEnumerator &VE,
882 BitstreamWriter &Stream) {
883 Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
885 SmallVector<uint64_t, 64> Record;
887 // Write metadata attachments
888 // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
889 SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
891 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
892 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
895 I->getAllMetadataOtherThanDebugLoc(MDs);
897 // If no metadata, ignore instruction.
898 if (MDs.empty()) continue;
900 Record.push_back(VE.getInstructionID(I));
902 for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
903 Record.push_back(MDs[i].first);
904 Record.push_back(VE.getMetadataID(MDs[i].second));
906 Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
913 static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
914 SmallVector<uint64_t, 64> Record;
916 // Write metadata kinds
917 // METADATA_KIND - [n x [id, name]]
918 SmallVector<StringRef, 8> Names;
919 M->getMDKindNames(Names);
921 if (Names.empty()) return;
923 Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
925 for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
926 Record.push_back(MDKindID);
927 StringRef KName = Names[MDKindID];
928 Record.append(KName.begin(), KName.end());
930 Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
937 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
939 Vals.push_back(V << 1);
941 Vals.push_back((-V << 1) | 1);
944 static void WriteConstants(unsigned FirstVal, unsigned LastVal,
945 const ValueEnumerator &VE,
946 BitstreamWriter &Stream, bool isGlobal) {
947 if (FirstVal == LastVal) return;
949 Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
951 unsigned AggregateAbbrev = 0;
952 unsigned String8Abbrev = 0;
953 unsigned CString7Abbrev = 0;
954 unsigned CString6Abbrev = 0;
955 // If this is a constant pool for the module, emit module-specific abbrevs.
957 // Abbrev for CST_CODE_AGGREGATE.
958 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
959 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
960 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
961 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
962 AggregateAbbrev = Stream.EmitAbbrev(Abbv);
964 // Abbrev for CST_CODE_STRING.
965 Abbv = new BitCodeAbbrev();
966 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
967 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
968 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
969 String8Abbrev = Stream.EmitAbbrev(Abbv);
970 // Abbrev for CST_CODE_CSTRING.
971 Abbv = new BitCodeAbbrev();
972 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
973 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
974 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
975 CString7Abbrev = Stream.EmitAbbrev(Abbv);
976 // Abbrev for CST_CODE_CSTRING.
977 Abbv = new BitCodeAbbrev();
978 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
979 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
980 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
981 CString6Abbrev = Stream.EmitAbbrev(Abbv);
984 SmallVector<uint64_t, 64> Record;
986 const ValueEnumerator::ValueList &Vals = VE.getValues();
987 Type *LastTy = nullptr;
988 for (unsigned i = FirstVal; i != LastVal; ++i) {
989 const Value *V = Vals[i].first;
990 // If we need to switch types, do so now.
991 if (V->getType() != LastTy) {
992 LastTy = V->getType();
993 Record.push_back(VE.getTypeID(LastTy));
994 Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
995 CONSTANTS_SETTYPE_ABBREV);
999 if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
1000 Record.push_back(unsigned(IA->hasSideEffects()) |
1001 unsigned(IA->isAlignStack()) << 1 |
1002 unsigned(IA->getDialect()&1) << 2);
1004 // Add the asm string.
1005 const std::string &AsmStr = IA->getAsmString();
1006 Record.push_back(AsmStr.size());
1007 for (unsigned i = 0, e = AsmStr.size(); i != e; ++i)
1008 Record.push_back(AsmStr[i]);
1010 // Add the constraint string.
1011 const std::string &ConstraintStr = IA->getConstraintString();
1012 Record.push_back(ConstraintStr.size());
1013 for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i)
1014 Record.push_back(ConstraintStr[i]);
1015 Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
1019 const Constant *C = cast<Constant>(V);
1020 unsigned Code = -1U;
1021 unsigned AbbrevToUse = 0;
1022 if (C->isNullValue()) {
1023 Code = bitc::CST_CODE_NULL;
1024 } else if (isa<UndefValue>(C)) {
1025 Code = bitc::CST_CODE_UNDEF;
1026 } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
1027 if (IV->getBitWidth() <= 64) {
1028 uint64_t V = IV->getSExtValue();
1029 emitSignedInt64(Record, V);
1030 Code = bitc::CST_CODE_INTEGER;
1031 AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
1032 } else { // Wide integers, > 64 bits in size.
1033 // We have an arbitrary precision integer value to write whose
1034 // bit width is > 64. However, in canonical unsigned integer
1035 // format it is likely that the high bits are going to be zero.
1036 // So, we only write the number of active words.
1037 unsigned NWords = IV->getValue().getActiveWords();
1038 const uint64_t *RawWords = IV->getValue().getRawData();
1039 for (unsigned i = 0; i != NWords; ++i) {
1040 emitSignedInt64(Record, RawWords[i]);
1042 Code = bitc::CST_CODE_WIDE_INTEGER;
1044 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
1045 Code = bitc::CST_CODE_FLOAT;
1046 Type *Ty = CFP->getType();
1047 if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) {
1048 Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
1049 } else if (Ty->isX86_FP80Ty()) {
1050 // api needed to prevent premature destruction
1051 // bits are not in the same order as a normal i80 APInt, compensate.
1052 APInt api = CFP->getValueAPF().bitcastToAPInt();
1053 const uint64_t *p = api.getRawData();
1054 Record.push_back((p[1] << 48) | (p[0] >> 16));
1055 Record.push_back(p[0] & 0xffffLL);
1056 } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
1057 APInt api = CFP->getValueAPF().bitcastToAPInt();
1058 const uint64_t *p = api.getRawData();
1059 Record.push_back(p[0]);
1060 Record.push_back(p[1]);
1062 assert (0 && "Unknown FP type!");
1064 } else if (isa<ConstantDataSequential>(C) &&
1065 cast<ConstantDataSequential>(C)->isString()) {
1066 const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
1067 // Emit constant strings specially.
1068 unsigned NumElts = Str->getNumElements();
1069 // If this is a null-terminated string, use the denser CSTRING encoding.
1070 if (Str->isCString()) {
1071 Code = bitc::CST_CODE_CSTRING;
1072 --NumElts; // Don't encode the null, which isn't allowed by char6.
1074 Code = bitc::CST_CODE_STRING;
1075 AbbrevToUse = String8Abbrev;
1077 bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
1078 bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
1079 for (unsigned i = 0; i != NumElts; ++i) {
1080 unsigned char V = Str->getElementAsInteger(i);
1081 Record.push_back(V);
1082 isCStr7 &= (V & 128) == 0;
1084 isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
1088 AbbrevToUse = CString6Abbrev;
1090 AbbrevToUse = CString7Abbrev;
1091 } else if (const ConstantDataSequential *CDS =
1092 dyn_cast<ConstantDataSequential>(C)) {
1093 Code = bitc::CST_CODE_DATA;
1094 Type *EltTy = CDS->getType()->getElementType();
1095 if (isa<IntegerType>(EltTy)) {
1096 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
1097 Record.push_back(CDS->getElementAsInteger(i));
1098 } else if (EltTy->isFloatTy()) {
1099 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1100 union { float F; uint32_t I; };
1101 F = CDS->getElementAsFloat(i);
1102 Record.push_back(I);
1105 assert(EltTy->isDoubleTy() && "Unknown ConstantData element type");
1106 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1107 union { double F; uint64_t I; };
1108 F = CDS->getElementAsDouble(i);
1109 Record.push_back(I);
1112 } else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) ||
1113 isa<ConstantVector>(C)) {
1114 Code = bitc::CST_CODE_AGGREGATE;
1115 for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
1116 Record.push_back(VE.getValueID(C->getOperand(i)));
1117 AbbrevToUse = AggregateAbbrev;
1118 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
1119 switch (CE->getOpcode()) {
1121 if (Instruction::isCast(CE->getOpcode())) {
1122 Code = bitc::CST_CODE_CE_CAST;
1123 Record.push_back(GetEncodedCastOpcode(CE->getOpcode()));
1124 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1125 Record.push_back(VE.getValueID(C->getOperand(0)));
1126 AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
1128 assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
1129 Code = bitc::CST_CODE_CE_BINOP;
1130 Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode()));
1131 Record.push_back(VE.getValueID(C->getOperand(0)));
1132 Record.push_back(VE.getValueID(C->getOperand(1)));
1133 uint64_t Flags = GetOptimizationFlags(CE);
1135 Record.push_back(Flags);
1138 case Instruction::GetElementPtr:
1139 Code = bitc::CST_CODE_CE_GEP;
1140 if (cast<GEPOperator>(C)->isInBounds())
1141 Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
1142 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
1143 Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
1144 Record.push_back(VE.getValueID(C->getOperand(i)));
1147 case Instruction::Select:
1148 Code = bitc::CST_CODE_CE_SELECT;
1149 Record.push_back(VE.getValueID(C->getOperand(0)));
1150 Record.push_back(VE.getValueID(C->getOperand(1)));
1151 Record.push_back(VE.getValueID(C->getOperand(2)));
1153 case Instruction::ExtractElement:
1154 Code = bitc::CST_CODE_CE_EXTRACTELT;
1155 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1156 Record.push_back(VE.getValueID(C->getOperand(0)));
1157 Record.push_back(VE.getTypeID(C->getOperand(1)->getType()));
1158 Record.push_back(VE.getValueID(C->getOperand(1)));
1160 case Instruction::InsertElement:
1161 Code = bitc::CST_CODE_CE_INSERTELT;
1162 Record.push_back(VE.getValueID(C->getOperand(0)));
1163 Record.push_back(VE.getValueID(C->getOperand(1)));
1164 Record.push_back(VE.getTypeID(C->getOperand(2)->getType()));
1165 Record.push_back(VE.getValueID(C->getOperand(2)));
1167 case Instruction::ShuffleVector:
1168 // If the return type and argument types are the same, this is a
1169 // standard shufflevector instruction. If the types are different,
1170 // then the shuffle is widening or truncating the input vectors, and
1171 // the argument type must also be encoded.
1172 if (C->getType() == C->getOperand(0)->getType()) {
1173 Code = bitc::CST_CODE_CE_SHUFFLEVEC;
1175 Code = bitc::CST_CODE_CE_SHUFVEC_EX;
1176 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1178 Record.push_back(VE.getValueID(C->getOperand(0)));
1179 Record.push_back(VE.getValueID(C->getOperand(1)));
1180 Record.push_back(VE.getValueID(C->getOperand(2)));
1182 case Instruction::ICmp:
1183 case Instruction::FCmp:
1184 Code = bitc::CST_CODE_CE_CMP;
1185 Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
1186 Record.push_back(VE.getValueID(C->getOperand(0)));
1187 Record.push_back(VE.getValueID(C->getOperand(1)));
1188 Record.push_back(CE->getPredicate());
1191 } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
1192 Code = bitc::CST_CODE_BLOCKADDRESS;
1193 Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
1194 Record.push_back(VE.getValueID(BA->getFunction()));
1195 Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
1200 llvm_unreachable("Unknown constant!");
1202 Stream.EmitRecord(Code, Record, AbbrevToUse);
1209 static void WriteModuleConstants(const ValueEnumerator &VE,
1210 BitstreamWriter &Stream) {
1211 const ValueEnumerator::ValueList &Vals = VE.getValues();
1213 // Find the first constant to emit, which is the first non-globalvalue value.
1214 // We know globalvalues have been emitted by WriteModuleInfo.
1215 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
1216 if (!isa<GlobalValue>(Vals[i].first)) {
1217 WriteConstants(i, Vals.size(), VE, Stream, true);
1223 /// PushValueAndType - The file has to encode both the value and type id for
1224 /// many values, because we need to know what type to create for forward
1225 /// references. However, most operands are not forward references, so this type
1226 /// field is not needed.
1228 /// This function adds V's value ID to Vals. If the value ID is higher than the
1229 /// instruction ID, then it is a forward reference, and it also includes the
1230 /// type ID. The value ID that is written is encoded relative to the InstID.
1231 static bool PushValueAndType(const Value *V, unsigned InstID,
1232 SmallVectorImpl<unsigned> &Vals,
1233 ValueEnumerator &VE) {
1234 unsigned ValID = VE.getValueID(V);
1235 // Make encoding relative to the InstID.
1236 Vals.push_back(InstID - ValID);
1237 if (ValID >= InstID) {
1238 Vals.push_back(VE.getTypeID(V->getType()));
1244 /// pushValue - Like PushValueAndType, but where the type of the value is
1245 /// omitted (perhaps it was already encoded in an earlier operand).
1246 static void pushValue(const Value *V, unsigned InstID,
1247 SmallVectorImpl<unsigned> &Vals,
1248 ValueEnumerator &VE) {
1249 unsigned ValID = VE.getValueID(V);
1250 Vals.push_back(InstID - ValID);
1253 static void pushValueSigned(const Value *V, unsigned InstID,
1254 SmallVectorImpl<uint64_t> &Vals,
1255 ValueEnumerator &VE) {
1256 unsigned ValID = VE.getValueID(V);
1257 int64_t diff = ((int32_t)InstID - (int32_t)ValID);
1258 emitSignedInt64(Vals, diff);
1261 /// WriteInstruction - Emit an instruction to the specified stream.
1262 static void WriteInstruction(const Instruction &I, unsigned InstID,
1263 ValueEnumerator &VE, BitstreamWriter &Stream,
1264 SmallVectorImpl<unsigned> &Vals) {
1266 unsigned AbbrevToUse = 0;
1267 VE.setInstructionID(&I);
1268 switch (I.getOpcode()) {
1270 if (Instruction::isCast(I.getOpcode())) {
1271 Code = bitc::FUNC_CODE_INST_CAST;
1272 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1273 AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
1274 Vals.push_back(VE.getTypeID(I.getType()));
1275 Vals.push_back(GetEncodedCastOpcode(I.getOpcode()));
1277 assert(isa<BinaryOperator>(I) && "Unknown instruction!");
1278 Code = bitc::FUNC_CODE_INST_BINOP;
1279 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1280 AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
1281 pushValue(I.getOperand(1), InstID, Vals, VE);
1282 Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode()));
1283 uint64_t Flags = GetOptimizationFlags(&I);
1285 if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
1286 AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
1287 Vals.push_back(Flags);
1292 case Instruction::GetElementPtr:
1293 Code = bitc::FUNC_CODE_INST_GEP;
1294 if (cast<GEPOperator>(&I)->isInBounds())
1295 Code = bitc::FUNC_CODE_INST_INBOUNDS_GEP;
1296 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
1297 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1299 case Instruction::ExtractValue: {
1300 Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
1301 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1302 const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
1303 for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i)
1307 case Instruction::InsertValue: {
1308 Code = bitc::FUNC_CODE_INST_INSERTVAL;
1309 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1310 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1311 const InsertValueInst *IVI = cast<InsertValueInst>(&I);
1312 for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
1316 case Instruction::Select:
1317 Code = bitc::FUNC_CODE_INST_VSELECT;
1318 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1319 pushValue(I.getOperand(2), InstID, Vals, VE);
1320 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1322 case Instruction::ExtractElement:
1323 Code = bitc::FUNC_CODE_INST_EXTRACTELT;
1324 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1325 PushValueAndType(I.getOperand(1), InstID, Vals, VE);
1327 case Instruction::InsertElement:
1328 Code = bitc::FUNC_CODE_INST_INSERTELT;
1329 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1330 pushValue(I.getOperand(1), InstID, Vals, VE);
1331 PushValueAndType(I.getOperand(2), InstID, Vals, VE);
1333 case Instruction::ShuffleVector:
1334 Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
1335 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1336 pushValue(I.getOperand(1), InstID, Vals, VE);
1337 pushValue(I.getOperand(2), InstID, Vals, VE);
1339 case Instruction::ICmp:
1340 case Instruction::FCmp:
1341 // compare returning Int1Ty or vector of Int1Ty
1342 Code = bitc::FUNC_CODE_INST_CMP2;
1343 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1344 pushValue(I.getOperand(1), InstID, Vals, VE);
1345 Vals.push_back(cast<CmpInst>(I).getPredicate());
1348 case Instruction::Ret:
1350 Code = bitc::FUNC_CODE_INST_RET;
1351 unsigned NumOperands = I.getNumOperands();
1352 if (NumOperands == 0)
1353 AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
1354 else if (NumOperands == 1) {
1355 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE))
1356 AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
1358 for (unsigned i = 0, e = NumOperands; i != e; ++i)
1359 PushValueAndType(I.getOperand(i), InstID, Vals, VE);
1363 case Instruction::Br:
1365 Code = bitc::FUNC_CODE_INST_BR;
1366 const BranchInst &II = cast<BranchInst>(I);
1367 Vals.push_back(VE.getValueID(II.getSuccessor(0)));
1368 if (II.isConditional()) {
1369 Vals.push_back(VE.getValueID(II.getSuccessor(1)));
1370 pushValue(II.getCondition(), InstID, Vals, VE);
1374 case Instruction::Switch:
1376 Code = bitc::FUNC_CODE_INST_SWITCH;
1377 const SwitchInst &SI = cast<SwitchInst>(I);
1378 Vals.push_back(VE.getTypeID(SI.getCondition()->getType()));
1379 pushValue(SI.getCondition(), InstID, Vals, VE);
1380 Vals.push_back(VE.getValueID(SI.getDefaultDest()));
1381 for (SwitchInst::ConstCaseIt i = SI.case_begin(), e = SI.case_end();
1383 Vals.push_back(VE.getValueID(i.getCaseValue()));
1384 Vals.push_back(VE.getValueID(i.getCaseSuccessor()));
1388 case Instruction::IndirectBr:
1389 Code = bitc::FUNC_CODE_INST_INDIRECTBR;
1390 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1391 // Encode the address operand as relative, but not the basic blocks.
1392 pushValue(I.getOperand(0), InstID, Vals, VE);
1393 for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i)
1394 Vals.push_back(VE.getValueID(I.getOperand(i)));
1397 case Instruction::Invoke: {
1398 const InvokeInst *II = cast<InvokeInst>(&I);
1399 const Value *Callee(II->getCalledValue());
1400 PointerType *PTy = cast<PointerType>(Callee->getType());
1401 FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1402 Code = bitc::FUNC_CODE_INST_INVOKE;
1404 Vals.push_back(VE.getAttributeID(II->getAttributes()));
1405 Vals.push_back(II->getCallingConv());
1406 Vals.push_back(VE.getValueID(II->getNormalDest()));
1407 Vals.push_back(VE.getValueID(II->getUnwindDest()));
1408 PushValueAndType(Callee, InstID, Vals, VE);
1410 // Emit value #'s for the fixed parameters.
1411 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
1412 pushValue(I.getOperand(i), InstID, Vals, VE); // fixed param.
1414 // Emit type/value pairs for varargs params.
1415 if (FTy->isVarArg()) {
1416 for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3;
1418 PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg
1422 case Instruction::Resume:
1423 Code = bitc::FUNC_CODE_INST_RESUME;
1424 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1426 case Instruction::Unreachable:
1427 Code = bitc::FUNC_CODE_INST_UNREACHABLE;
1428 AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
1431 case Instruction::PHI: {
1432 const PHINode &PN = cast<PHINode>(I);
1433 Code = bitc::FUNC_CODE_INST_PHI;
1434 // With the newer instruction encoding, forward references could give
1435 // negative valued IDs. This is most common for PHIs, so we use
1437 SmallVector<uint64_t, 128> Vals64;
1438 Vals64.push_back(VE.getTypeID(PN.getType()));
1439 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
1440 pushValueSigned(PN.getIncomingValue(i), InstID, Vals64, VE);
1441 Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i)));
1443 // Emit a Vals64 vector and exit.
1444 Stream.EmitRecord(Code, Vals64, AbbrevToUse);
1449 case Instruction::LandingPad: {
1450 const LandingPadInst &LP = cast<LandingPadInst>(I);
1451 Code = bitc::FUNC_CODE_INST_LANDINGPAD;
1452 Vals.push_back(VE.getTypeID(LP.getType()));
1453 PushValueAndType(LP.getPersonalityFn(), InstID, Vals, VE);
1454 Vals.push_back(LP.isCleanup());
1455 Vals.push_back(LP.getNumClauses());
1456 for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) {
1458 Vals.push_back(LandingPadInst::Catch);
1460 Vals.push_back(LandingPadInst::Filter);
1461 PushValueAndType(LP.getClause(I), InstID, Vals, VE);
1466 case Instruction::Alloca: {
1467 Code = bitc::FUNC_CODE_INST_ALLOCA;
1468 Vals.push_back(VE.getTypeID(I.getType()));
1469 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
1470 Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
1471 const AllocaInst &AI = cast<AllocaInst>(I);
1472 unsigned AlignRecord = Log2_32(AI.getAlignment()) + 1;
1473 assert(Log2_32(Value::MaximumAlignment) + 1 < 1 << 5 &&
1474 "not enough bits for maximum alignment");
1475 assert(AlignRecord < 1 << 5 && "alignment greater than 1 << 64");
1476 AlignRecord |= AI.isUsedWithInAlloca() << 5;
1477 Vals.push_back(AlignRecord);
1481 case Instruction::Load:
1482 if (cast<LoadInst>(I).isAtomic()) {
1483 Code = bitc::FUNC_CODE_INST_LOADATOMIC;
1484 PushValueAndType(I.getOperand(0), InstID, Vals, VE);
1486 Code = bitc::FUNC_CODE_INST_LOAD;
1487 if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr
1488 AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
1490 Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
1491 Vals.push_back(cast<LoadInst>(I).isVolatile());
1492 if (cast<LoadInst>(I).isAtomic()) {
1493 Vals.push_back(GetEncodedOrdering(cast<LoadInst>(I).getOrdering()));
1494 Vals.push_back(GetEncodedSynchScope(cast<LoadInst>(I).getSynchScope()));
1497 case Instruction::Store:
1498 if (cast<StoreInst>(I).isAtomic())
1499 Code = bitc::FUNC_CODE_INST_STOREATOMIC;
1501 Code = bitc::FUNC_CODE_INST_STORE;
1502 PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr
1503 pushValue(I.getOperand(0), InstID, Vals, VE); // val.
1504 Vals.push_back(Log2_32(cast<StoreInst>(I).getAlignment())+1);
1505 Vals.push_back(cast<StoreInst>(I).isVolatile());
1506 if (cast<StoreInst>(I).isAtomic()) {
1507 Vals.push_back(GetEncodedOrdering(cast<StoreInst>(I).getOrdering()));
1508 Vals.push_back(GetEncodedSynchScope(cast<StoreInst>(I).getSynchScope()));
1511 case Instruction::AtomicCmpXchg:
1512 Code = bitc::FUNC_CODE_INST_CMPXCHG;
1513 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr
1514 pushValue(I.getOperand(1), InstID, Vals, VE); // cmp.
1515 pushValue(I.getOperand(2), InstID, Vals, VE); // newval.
1516 Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile());
1517 Vals.push_back(GetEncodedOrdering(
1518 cast<AtomicCmpXchgInst>(I).getSuccessOrdering()));
1519 Vals.push_back(GetEncodedSynchScope(
1520 cast<AtomicCmpXchgInst>(I).getSynchScope()));
1521 Vals.push_back(GetEncodedOrdering(
1522 cast<AtomicCmpXchgInst>(I).getFailureOrdering()));
1523 Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak());
1525 case Instruction::AtomicRMW:
1526 Code = bitc::FUNC_CODE_INST_ATOMICRMW;
1527 PushValueAndType(I.getOperand(0), InstID, Vals, VE); // ptrty + ptr
1528 pushValue(I.getOperand(1), InstID, Vals, VE); // val.
1529 Vals.push_back(GetEncodedRMWOperation(
1530 cast<AtomicRMWInst>(I).getOperation()));
1531 Vals.push_back(cast<AtomicRMWInst>(I).isVolatile());
1532 Vals.push_back(GetEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering()));
1533 Vals.push_back(GetEncodedSynchScope(
1534 cast<AtomicRMWInst>(I).getSynchScope()));
1536 case Instruction::Fence:
1537 Code = bitc::FUNC_CODE_INST_FENCE;
1538 Vals.push_back(GetEncodedOrdering(cast<FenceInst>(I).getOrdering()));
1539 Vals.push_back(GetEncodedSynchScope(cast<FenceInst>(I).getSynchScope()));
1541 case Instruction::Call: {
1542 const CallInst &CI = cast<CallInst>(I);
1543 PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
1544 FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1546 Code = bitc::FUNC_CODE_INST_CALL;
1548 Vals.push_back(VE.getAttributeID(CI.getAttributes()));
1549 Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()) |
1550 unsigned(CI.isMustTailCall()) << 14);
1551 PushValueAndType(CI.getCalledValue(), InstID, Vals, VE); // Callee
1553 // Emit value #'s for the fixed parameters.
1554 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) {
1555 // Check for labels (can happen with asm labels).
1556 if (FTy->getParamType(i)->isLabelTy())
1557 Vals.push_back(VE.getValueID(CI.getArgOperand(i)));
1559 pushValue(CI.getArgOperand(i), InstID, Vals, VE); // fixed param.
1562 // Emit type/value pairs for varargs params.
1563 if (FTy->isVarArg()) {
1564 for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
1566 PushValueAndType(CI.getArgOperand(i), InstID, Vals, VE); // varargs
1570 case Instruction::VAArg:
1571 Code = bitc::FUNC_CODE_INST_VAARG;
1572 Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty
1573 pushValue(I.getOperand(0), InstID, Vals, VE); // valist.
1574 Vals.push_back(VE.getTypeID(I.getType())); // restype.
1578 Stream.EmitRecord(Code, Vals, AbbrevToUse);
1582 // Emit names for globals/functions etc.
1583 static void WriteValueSymbolTable(const ValueSymbolTable &VST,
1584 const ValueEnumerator &VE,
1585 BitstreamWriter &Stream) {
1586 if (VST.empty()) return;
1587 Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
1589 // FIXME: Set up the abbrev, we know how many values there are!
1590 // FIXME: We know if the type names can use 7-bit ascii.
1591 SmallVector<unsigned, 64> NameVals;
1593 for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
1596 const ValueName &Name = *SI;
1598 // Figure out the encoding to use for the name.
1600 bool isChar6 = true;
1601 for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength();
1604 isChar6 = BitCodeAbbrevOp::isChar6(*C);
1605 if ((unsigned char)*C & 128) {
1607 break; // don't bother scanning the rest.
1611 unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
1613 // VST_ENTRY: [valueid, namechar x N]
1614 // VST_BBENTRY: [bbid, namechar x N]
1616 if (isa<BasicBlock>(SI->getValue())) {
1617 Code = bitc::VST_CODE_BBENTRY;
1619 AbbrevToUse = VST_BBENTRY_6_ABBREV;
1621 Code = bitc::VST_CODE_ENTRY;
1623 AbbrevToUse = VST_ENTRY_6_ABBREV;
1625 AbbrevToUse = VST_ENTRY_7_ABBREV;
1628 NameVals.push_back(VE.getValueID(SI->getValue()));
1629 for (const char *P = Name.getKeyData(),
1630 *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P)
1631 NameVals.push_back((unsigned char)*P);
1633 // Emit the finished record.
1634 Stream.EmitRecord(Code, NameVals, AbbrevToUse);
1640 static void WriteUseList(ValueEnumerator &VE, UseListOrder &&Order,
1641 BitstreamWriter &Stream) {
1642 assert(Order.Shuffle.size() >= 2 && "Shuffle too small");
1644 if (isa<BasicBlock>(Order.V))
1645 Code = bitc::USELIST_CODE_BB;
1647 Code = bitc::USELIST_CODE_DEFAULT;
1649 SmallVector<uint64_t, 64> Record;
1650 for (unsigned I : Order.Shuffle)
1651 Record.push_back(I);
1652 Record.push_back(VE.getValueID(Order.V));
1653 Stream.EmitRecord(Code, Record);
1656 static void WriteUseListBlock(const Function *F, ValueEnumerator &VE,
1657 BitstreamWriter &Stream) {
1658 auto hasMore = [&]() {
1659 return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
1665 Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
1667 WriteUseList(VE, std::move(VE.UseListOrders.back()), Stream);
1668 VE.UseListOrders.pop_back();
1673 /// WriteFunction - Emit a function body to the module stream.
1674 static void WriteFunction(const Function &F, ValueEnumerator &VE,
1675 BitstreamWriter &Stream) {
1676 Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
1677 VE.incorporateFunction(F);
1679 SmallVector<unsigned, 64> Vals;
1681 // Emit the number of basic blocks, so the reader can create them ahead of
1683 Vals.push_back(VE.getBasicBlocks().size());
1684 Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
1687 // If there are function-local constants, emit them now.
1688 unsigned CstStart, CstEnd;
1689 VE.getFunctionConstantRange(CstStart, CstEnd);
1690 WriteConstants(CstStart, CstEnd, VE, Stream, false);
1692 // If there is function-local metadata, emit it now.
1693 WriteFunctionLocalMetadata(F, VE, Stream);
1695 // Keep a running idea of what the instruction ID is.
1696 unsigned InstID = CstEnd;
1698 bool NeedsMetadataAttachment = false;
1702 // Finally, emit all the instructions, in order.
1703 for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
1704 for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
1706 WriteInstruction(*I, InstID, VE, Stream, Vals);
1708 if (!I->getType()->isVoidTy())
1711 // If the instruction has metadata, write a metadata attachment later.
1712 NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
1714 // If the instruction has a debug location, emit it.
1715 DebugLoc DL = I->getDebugLoc();
1716 if (DL.isUnknown()) {
1718 } else if (DL == LastDL) {
1719 // Just repeat the same debug loc as last time.
1720 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
1723 DL.getScopeAndInlinedAt(Scope, IA, I->getContext());
1724 assert(Scope && "Expected valid scope");
1726 Vals.push_back(DL.getLine());
1727 Vals.push_back(DL.getCol());
1728 Vals.push_back(Scope ? VE.getMetadataID(Scope) + 1 : 0);
1729 Vals.push_back(IA ? VE.getMetadataID(IA) + 1 : 0);
1730 Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
1737 // Emit names for all the instructions etc.
1738 WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
1740 if (NeedsMetadataAttachment)
1741 WriteMetadataAttachment(F, VE, Stream);
1742 if (shouldPreserveBitcodeUseListOrder())
1743 WriteUseListBlock(&F, VE, Stream);
1748 // Emit blockinfo, which defines the standard abbreviations etc.
1749 static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
1750 // We only want to emit block info records for blocks that have multiple
1751 // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK.
1752 // Other blocks can define their abbrevs inline.
1753 Stream.EnterBlockInfoBlock(2);
1755 { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings.
1756 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1757 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
1758 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1759 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1760 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
1761 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1762 Abbv) != VST_ENTRY_8_ABBREV)
1763 llvm_unreachable("Unexpected abbrev ordering!");
1766 { // 7-bit fixed width VST_ENTRY strings.
1767 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1768 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1769 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1770 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1771 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
1772 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1773 Abbv) != VST_ENTRY_7_ABBREV)
1774 llvm_unreachable("Unexpected abbrev ordering!");
1776 { // 6-bit char6 VST_ENTRY strings.
1777 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1778 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
1779 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1780 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1781 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1782 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1783 Abbv) != VST_ENTRY_6_ABBREV)
1784 llvm_unreachable("Unexpected abbrev ordering!");
1786 { // 6-bit char6 VST_BBENTRY strings.
1787 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1788 Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
1789 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1790 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1791 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
1792 if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID,
1793 Abbv) != VST_BBENTRY_6_ABBREV)
1794 llvm_unreachable("Unexpected abbrev ordering!");
1799 { // SETTYPE abbrev for CONSTANTS_BLOCK.
1800 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1801 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
1802 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1803 Log2_32_Ceil(VE.getTypes().size()+1)));
1804 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1805 Abbv) != CONSTANTS_SETTYPE_ABBREV)
1806 llvm_unreachable("Unexpected abbrev ordering!");
1809 { // INTEGER abbrev for CONSTANTS_BLOCK.
1810 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1811 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
1812 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
1813 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1814 Abbv) != CONSTANTS_INTEGER_ABBREV)
1815 llvm_unreachable("Unexpected abbrev ordering!");
1818 { // CE_CAST abbrev for CONSTANTS_BLOCK.
1819 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1820 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
1821 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc
1822 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
1823 Log2_32_Ceil(VE.getTypes().size()+1)));
1824 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
1826 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1827 Abbv) != CONSTANTS_CE_CAST_Abbrev)
1828 llvm_unreachable("Unexpected abbrev ordering!");
1830 { // NULL abbrev for CONSTANTS_BLOCK.
1831 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1832 Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
1833 if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID,
1834 Abbv) != CONSTANTS_NULL_Abbrev)
1835 llvm_unreachable("Unexpected abbrev ordering!");
1838 // FIXME: This should only use space for first class types!
1840 { // INST_LOAD abbrev for FUNCTION_BLOCK.
1841 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1842 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
1843 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
1844 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
1845 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
1846 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1847 Abbv) != FUNCTION_INST_LOAD_ABBREV)
1848 llvm_unreachable("Unexpected abbrev ordering!");
1850 { // INST_BINOP abbrev for FUNCTION_BLOCK.
1851 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1852 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1853 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1854 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1855 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1856 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1857 Abbv) != FUNCTION_INST_BINOP_ABBREV)
1858 llvm_unreachable("Unexpected abbrev ordering!");
1860 { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
1861 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1862 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
1863 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
1864 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
1865 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1866 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
1867 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1868 Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
1869 llvm_unreachable("Unexpected abbrev ordering!");
1871 { // INST_CAST abbrev for FUNCTION_BLOCK.
1872 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1873 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
1874 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal
1875 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
1876 Log2_32_Ceil(VE.getTypes().size()+1)));
1877 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
1878 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1879 Abbv) != FUNCTION_INST_CAST_ABBREV)
1880 llvm_unreachable("Unexpected abbrev ordering!");
1883 { // INST_RET abbrev for FUNCTION_BLOCK.
1884 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1885 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1886 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1887 Abbv) != FUNCTION_INST_RET_VOID_ABBREV)
1888 llvm_unreachable("Unexpected abbrev ordering!");
1890 { // INST_RET abbrev for FUNCTION_BLOCK.
1891 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1892 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
1893 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
1894 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1895 Abbv) != FUNCTION_INST_RET_VAL_ABBREV)
1896 llvm_unreachable("Unexpected abbrev ordering!");
1898 { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
1899 BitCodeAbbrev *Abbv = new BitCodeAbbrev();
1900 Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
1901 if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
1902 Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV)
1903 llvm_unreachable("Unexpected abbrev ordering!");
1909 /// WriteModule - Emit the specified module to the bitstream.
1910 static void WriteModule(const Module *M, BitstreamWriter &Stream) {
1911 Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
1913 SmallVector<unsigned, 1> Vals;
1914 unsigned CurVersion = 1;
1915 Vals.push_back(CurVersion);
1916 Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
1918 // Analyze the module, enumerating globals, functions, etc.
1919 ValueEnumerator VE(*M);
1921 // Emit blockinfo, which defines the standard abbreviations etc.
1922 WriteBlockInfo(VE, Stream);
1924 // Emit information about attribute groups.
1925 WriteAttributeGroupTable(VE, Stream);
1927 // Emit information about parameter attributes.
1928 WriteAttributeTable(VE, Stream);
1930 // Emit information describing all of the types in the module.
1931 WriteTypeTable(VE, Stream);
1933 writeComdats(VE, Stream);
1935 // Emit top-level description of module, including target triple, inline asm,
1936 // descriptors for global variables, and function prototype info.
1937 WriteModuleInfo(M, VE, Stream);
1940 WriteModuleConstants(VE, Stream);
1943 WriteModuleMetadata(M, VE, Stream);
1946 WriteModuleMetadataStore(M, Stream);
1948 // Emit names for globals/functions etc.
1949 WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream);
1951 // Emit module-level use-lists.
1952 if (shouldPreserveBitcodeUseListOrder())
1953 WriteUseListBlock(nullptr, VE, Stream);
1955 // Emit function bodies.
1956 for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F)
1957 if (!F->isDeclaration())
1958 WriteFunction(*F, VE, Stream);
1963 /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a
1964 /// header and trailer to make it compatible with the system archiver. To do
1965 /// this we emit the following header, and then emit a trailer that pads the
1966 /// file out to be a multiple of 16 bytes.
1968 /// struct bc_header {
1969 /// uint32_t Magic; // 0x0B17C0DE
1970 /// uint32_t Version; // Version, currently always 0.
1971 /// uint32_t BitcodeOffset; // Offset to traditional bitcode file.
1972 /// uint32_t BitcodeSize; // Size of traditional bitcode file.
1973 /// uint32_t CPUType; // CPU specifier.
1974 /// ... potentially more later ...
1977 DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size.
1978 DarwinBCHeaderSize = 5*4
1981 static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
1982 uint32_t &Position) {
1983 Buffer[Position + 0] = (unsigned char) (Value >> 0);
1984 Buffer[Position + 1] = (unsigned char) (Value >> 8);
1985 Buffer[Position + 2] = (unsigned char) (Value >> 16);
1986 Buffer[Position + 3] = (unsigned char) (Value >> 24);
1990 static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
1992 unsigned CPUType = ~0U;
1994 // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
1995 // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
1996 // number from /usr/include/mach/machine.h. It is ok to reproduce the
1997 // specific constants here because they are implicitly part of the Darwin ABI.
1999 DARWIN_CPU_ARCH_ABI64 = 0x01000000,
2000 DARWIN_CPU_TYPE_X86 = 7,
2001 DARWIN_CPU_TYPE_ARM = 12,
2002 DARWIN_CPU_TYPE_POWERPC = 18
2005 Triple::ArchType Arch = TT.getArch();
2006 if (Arch == Triple::x86_64)
2007 CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
2008 else if (Arch == Triple::x86)
2009 CPUType = DARWIN_CPU_TYPE_X86;
2010 else if (Arch == Triple::ppc)
2011 CPUType = DARWIN_CPU_TYPE_POWERPC;
2012 else if (Arch == Triple::ppc64)
2013 CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
2014 else if (Arch == Triple::arm || Arch == Triple::thumb)
2015 CPUType = DARWIN_CPU_TYPE_ARM;
2017 // Traditional Bitcode starts after header.
2018 assert(Buffer.size() >= DarwinBCHeaderSize &&
2019 "Expected header size to be reserved");
2020 unsigned BCOffset = DarwinBCHeaderSize;
2021 unsigned BCSize = Buffer.size()-DarwinBCHeaderSize;
2023 // Write the magic and version.
2024 unsigned Position = 0;
2025 WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position);
2026 WriteInt32ToBuffer(0 , Buffer, Position); // Version.
2027 WriteInt32ToBuffer(BCOffset , Buffer, Position);
2028 WriteInt32ToBuffer(BCSize , Buffer, Position);
2029 WriteInt32ToBuffer(CPUType , Buffer, Position);
2031 // If the file is not a multiple of 16 bytes, insert dummy padding.
2032 while (Buffer.size() & 15)
2033 Buffer.push_back(0);
2036 /// WriteBitcodeToFile - Write the specified module to the specified output
2038 void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
2039 SmallVector<char, 0> Buffer;
2040 Buffer.reserve(256*1024);
2042 // If this is darwin or another generic macho target, reserve space for the
2044 Triple TT(M->getTargetTriple());
2045 if (TT.isOSDarwin())
2046 Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0);
2048 // Emit the module into the buffer.
2050 BitstreamWriter Stream(Buffer);
2052 // Emit the file header.
2053 Stream.Emit((unsigned)'B', 8);
2054 Stream.Emit((unsigned)'C', 8);
2055 Stream.Emit(0x0, 4);
2056 Stream.Emit(0xC, 4);
2057 Stream.Emit(0xE, 4);
2058 Stream.Emit(0xD, 4);
2061 WriteModule(M, Stream);
2064 if (TT.isOSDarwin())
2065 EmitDarwinBCHeaderAndTrailer(Buffer, TT);
2067 // Write the generated bitstream to "Out".
2068 Out.write((char*)&Buffer.front(), Buffer.size());