//===--- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ----------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // Bitcode writer implementation. // //===----------------------------------------------------------------------===// #include "llvm/Bitcode/ReaderWriter.h" #include "llvm/Bitcode/BitstreamWriter.h" #include "llvm/Bitcode/LLVMBitCodes.h" #include "ValueEnumerator.h" #include "llvm/Constants.h" #include "llvm/DerivedTypes.h" #include "llvm/InlineAsm.h" #include "llvm/Instructions.h" #include "llvm/Module.h" #include "llvm/TypeSymbolTable.h" #include "llvm/ValueSymbolTable.h" #include "llvm/Support/MathExtras.h" #include "llvm/Support/Streams.h" #include "llvm/Support/raw_ostream.h" #include "llvm/System/Program.h" using namespace llvm; /// These are manifest constants used by the bitcode writer. They do not need to /// be kept in sync with the reader, but need to be consistent within this file. enum { CurVersion = 0, // VALUE_SYMTAB_BLOCK abbrev id's. VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, VST_ENTRY_7_ABBREV, VST_ENTRY_6_ABBREV, VST_BBENTRY_6_ABBREV, // CONSTANTS_BLOCK abbrev id's. CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, CONSTANTS_INTEGER_ABBREV, CONSTANTS_CE_CAST_Abbrev, CONSTANTS_NULL_Abbrev, // FUNCTION_BLOCK abbrev id's. FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, FUNCTION_INST_BINOP_ABBREV, FUNCTION_INST_CAST_ABBREV, FUNCTION_INST_RET_VOID_ABBREV, FUNCTION_INST_RET_VAL_ABBREV, FUNCTION_INST_UNREACHABLE_ABBREV }; static unsigned GetEncodedCastOpcode(unsigned Opcode) { switch (Opcode) { default: assert(0 && "Unknown cast instruction!"); case Instruction::Trunc : return bitc::CAST_TRUNC; case Instruction::ZExt : return bitc::CAST_ZEXT; case Instruction::SExt : return bitc::CAST_SEXT; case Instruction::FPToUI : return bitc::CAST_FPTOUI; case Instruction::FPToSI : return bitc::CAST_FPTOSI; case Instruction::UIToFP : return bitc::CAST_UITOFP; case Instruction::SIToFP : return bitc::CAST_SITOFP; case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; case Instruction::FPExt : return bitc::CAST_FPEXT; case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; case Instruction::BitCast : return bitc::CAST_BITCAST; } } static unsigned GetEncodedBinaryOpcode(unsigned Opcode) { switch (Opcode) { default: assert(0 && "Unknown binary instruction!"); case Instruction::Add: return bitc::BINOP_ADD; case Instruction::Sub: return bitc::BINOP_SUB; case Instruction::Mul: return bitc::BINOP_MUL; case Instruction::UDiv: return bitc::BINOP_UDIV; case Instruction::FDiv: case Instruction::SDiv: return bitc::BINOP_SDIV; case Instruction::URem: return bitc::BINOP_UREM; case Instruction::FRem: case Instruction::SRem: return bitc::BINOP_SREM; case Instruction::Shl: return bitc::BINOP_SHL; case Instruction::LShr: return bitc::BINOP_LSHR; case Instruction::AShr: return bitc::BINOP_ASHR; case Instruction::And: return bitc::BINOP_AND; case Instruction::Or: return bitc::BINOP_OR; case Instruction::Xor: return bitc::BINOP_XOR; } } static void WriteStringRecord(unsigned Code, const std::string &Str, unsigned AbbrevToUse, BitstreamWriter &Stream) { SmallVector Vals; // Code: [strchar x N] for (unsigned i = 0, e = Str.size(); i != e; ++i) Vals.push_back(Str[i]); // Emit the finished record. Stream.EmitRecord(Code, Vals, AbbrevToUse); } // Emit information about parameter attributes. static void WriteAttributeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { const std::vector &Attrs = VE.getAttributes(); if (Attrs.empty()) return; Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); SmallVector Record; for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { const AttrListPtr &A = Attrs[i]; for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) { const AttributeWithIndex &PAWI = A.getSlot(i); Record.push_back(PAWI.Index); // FIXME: remove in LLVM 3.0 // Store the alignment in the bitcode as a 16-bit raw value instead of a // 5-bit log2 encoded value. Shift the bits above the alignment up by // 11 bits. uint64_t FauxAttr = PAWI.Attrs & 0xffff; if (PAWI.Attrs & Attribute::Alignment) FauxAttr |= (1ull<<16)<<(((PAWI.Attrs & Attribute::Alignment)-1) >> 16); FauxAttr |= (PAWI.Attrs & (0x3FFull << 21)) << 11; Record.push_back(FauxAttr); } Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); Record.clear(); } Stream.ExitBlock(); } /// WriteTypeTable - Write out the type table for a module. static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) { const ValueEnumerator::TypeList &TypeList = VE.getTypes(); Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */); SmallVector TypeVals; // Abbrev for TYPE_CODE_POINTER. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(VE.getTypes().size()+1))); Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0 unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv); // Abbrev for TYPE_CODE_FUNCTION. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg Abbv->Add(BitCodeAbbrevOp(0)); // FIXME: DEAD value, remove in LLVM 3.0 Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(VE.getTypes().size()+1))); unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv); // Abbrev for TYPE_CODE_STRUCT. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(VE.getTypes().size()+1))); unsigned StructAbbrev = Stream.EmitAbbrev(Abbv); // Abbrev for TYPE_CODE_ARRAY. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(VE.getTypes().size()+1))); unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv); // Emit an entry count so the reader can reserve space. TypeVals.push_back(TypeList.size()); Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); TypeVals.clear(); // Loop over all of the types, emitting each in turn. for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { const Type *T = TypeList[i].first; int AbbrevToUse = 0; unsigned Code = 0; switch (T->getTypeID()) { default: assert(0 && "Unknown type!"); case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break; case Type::FloatTyID: Code = bitc::TYPE_CODE_FLOAT; break; case Type::DoubleTyID: Code = bitc::TYPE_CODE_DOUBLE; break; case Type::X86_FP80TyID: Code = bitc::TYPE_CODE_X86_FP80; break; case Type::FP128TyID: Code = bitc::TYPE_CODE_FP128; break; case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; case Type::LabelTyID: Code = bitc::TYPE_CODE_LABEL; break; case Type::OpaqueTyID: Code = bitc::TYPE_CODE_OPAQUE; break; case Type::IntegerTyID: // INTEGER: [width] Code = bitc::TYPE_CODE_INTEGER; TypeVals.push_back(cast(T)->getBitWidth()); break; case Type::PointerTyID: { const PointerType *PTy = cast(T); // POINTER: [pointee type, address space] Code = bitc::TYPE_CODE_POINTER; TypeVals.push_back(VE.getTypeID(PTy->getElementType())); unsigned AddressSpace = PTy->getAddressSpace(); TypeVals.push_back(AddressSpace); if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; break; } case Type::FunctionTyID: { const FunctionType *FT = cast(T); // FUNCTION: [isvararg, attrid, retty, paramty x N] Code = bitc::TYPE_CODE_FUNCTION; TypeVals.push_back(FT->isVarArg()); TypeVals.push_back(0); // FIXME: DEAD: remove in llvm 3.0 TypeVals.push_back(VE.getTypeID(FT->getReturnType())); for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); AbbrevToUse = FunctionAbbrev; break; } case Type::StructTyID: { const StructType *ST = cast(T); // STRUCT: [ispacked, eltty x N] Code = bitc::TYPE_CODE_STRUCT; TypeVals.push_back(ST->isPacked()); // Output all of the element types. for (StructType::element_iterator I = ST->element_begin(), E = ST->element_end(); I != E; ++I) TypeVals.push_back(VE.getTypeID(*I)); AbbrevToUse = StructAbbrev; break; } case Type::ArrayTyID: { const ArrayType *AT = cast(T); // ARRAY: [numelts, eltty] Code = bitc::TYPE_CODE_ARRAY; TypeVals.push_back(AT->getNumElements()); TypeVals.push_back(VE.getTypeID(AT->getElementType())); AbbrevToUse = ArrayAbbrev; break; } case Type::VectorTyID: { const VectorType *VT = cast(T); // VECTOR [numelts, eltty] Code = bitc::TYPE_CODE_VECTOR; TypeVals.push_back(VT->getNumElements()); TypeVals.push_back(VE.getTypeID(VT->getElementType())); break; } } // Emit the finished record. Stream.EmitRecord(Code, TypeVals, AbbrevToUse); TypeVals.clear(); } Stream.ExitBlock(); } static unsigned getEncodedLinkage(const GlobalValue *GV) { switch (GV->getLinkage()) { default: assert(0 && "Invalid linkage!"); case GlobalValue::GhostLinkage: // Map ghost linkage onto external. case GlobalValue::ExternalLinkage: return 0; case GlobalValue::WeakAnyLinkage: return 1; case GlobalValue::AppendingLinkage: return 2; case GlobalValue::InternalLinkage: return 3; case GlobalValue::LinkOnceAnyLinkage: return 4; case GlobalValue::DLLImportLinkage: return 5; case GlobalValue::DLLExportLinkage: return 6; case GlobalValue::ExternalWeakLinkage: return 7; case GlobalValue::CommonLinkage: return 8; case GlobalValue::PrivateLinkage: return 9; case GlobalValue::WeakODRLinkage: return 10; case GlobalValue::LinkOnceODRLinkage: return 11; case GlobalValue::AvailableExternallyLinkage: return 12; } } static unsigned getEncodedVisibility(const GlobalValue *GV) { switch (GV->getVisibility()) { default: assert(0 && "Invalid visibility!"); case GlobalValue::DefaultVisibility: return 0; case GlobalValue::HiddenVisibility: return 1; case GlobalValue::ProtectedVisibility: return 2; } } // Emit top-level description of module, including target triple, inline asm, // descriptors for global variables, and function prototype info. static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE, BitstreamWriter &Stream) { // Emit the list of dependent libraries for the Module. for (Module::lib_iterator I = M->lib_begin(), E = M->lib_end(); I != E; ++I) WriteStringRecord(bitc::MODULE_CODE_DEPLIB, *I, 0/*TODO*/, Stream); // Emit various pieces of data attached to a module. if (!M->getTargetTriple().empty()) WriteStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(), 0/*TODO*/, Stream); if (!M->getDataLayout().empty()) WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout(), 0/*TODO*/, Stream); if (!M->getModuleInlineAsm().empty()) WriteStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(), 0/*TODO*/, Stream); // Emit information about sections and GC, computing how many there are. Also // compute the maximum alignment value. std::map SectionMap; std::map GCMap; unsigned MaxAlignment = 0; unsigned MaxGlobalType = 0; for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); GV != E; ++GV) { MaxAlignment = std::max(MaxAlignment, GV->getAlignment()); MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV->getType())); if (!GV->hasSection()) continue; // Give section names unique ID's. unsigned &Entry = SectionMap[GV->getSection()]; if (Entry != 0) continue; WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, GV->getSection(), 0/*TODO*/, Stream); Entry = SectionMap.size(); } for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { MaxAlignment = std::max(MaxAlignment, F->getAlignment()); if (F->hasSection()) { // Give section names unique ID's. unsigned &Entry = SectionMap[F->getSection()]; if (!Entry) { WriteStringRecord(bitc::MODULE_CODE_SECTIONNAME, F->getSection(), 0/*TODO*/, Stream); Entry = SectionMap.size(); } } if (F->hasGC()) { // Same for GC names. unsigned &Entry = GCMap[F->getGC()]; if (!Entry) { WriteStringRecord(bitc::MODULE_CODE_GCNAME, F->getGC(), 0/*TODO*/, Stream); Entry = GCMap.size(); } } } // Emit abbrev for globals, now that we know # sections and max alignment. unsigned SimpleGVarAbbrev = 0; if (!M->global_empty()) { // Add an abbrev for common globals with no visibility or thread localness. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(MaxGlobalType+1))); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant. Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer. Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // Linkage. if (MaxAlignment == 0) // Alignment. Abbv->Add(BitCodeAbbrevOp(0)); else { unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1; Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(MaxEncAlignment+1))); } if (SectionMap.empty()) // Section. Abbv->Add(BitCodeAbbrevOp(0)); else Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(SectionMap.size()+1))); // Don't bother emitting vis + thread local. SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv); } // Emit the global variable information. SmallVector Vals; for (Module::const_global_iterator GV = M->global_begin(),E = M->global_end(); GV != E; ++GV) { unsigned AbbrevToUse = 0; // GLOBALVAR: [type, isconst, initid, // linkage, alignment, section, visibility, threadlocal] Vals.push_back(VE.getTypeID(GV->getType())); Vals.push_back(GV->isConstant()); Vals.push_back(GV->isDeclaration() ? 0 : (VE.getValueID(GV->getInitializer()) + 1)); Vals.push_back(getEncodedLinkage(GV)); Vals.push_back(Log2_32(GV->getAlignment())+1); Vals.push_back(GV->hasSection() ? SectionMap[GV->getSection()] : 0); if (GV->isThreadLocal() || GV->getVisibility() != GlobalValue::DefaultVisibility) { Vals.push_back(getEncodedVisibility(GV)); Vals.push_back(GV->isThreadLocal()); } else { AbbrevToUse = SimpleGVarAbbrev; } Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); Vals.clear(); } // Emit the function proto information. for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { // FUNCTION: [type, callingconv, isproto, paramattr, // linkage, alignment, section, visibility, gc] Vals.push_back(VE.getTypeID(F->getType())); Vals.push_back(F->getCallingConv()); Vals.push_back(F->isDeclaration()); Vals.push_back(getEncodedLinkage(F)); Vals.push_back(VE.getAttributeID(F->getAttributes())); Vals.push_back(Log2_32(F->getAlignment())+1); Vals.push_back(F->hasSection() ? SectionMap[F->getSection()] : 0); Vals.push_back(getEncodedVisibility(F)); Vals.push_back(F->hasGC() ? GCMap[F->getGC()] : 0); unsigned AbbrevToUse = 0; Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); Vals.clear(); } // Emit the alias information. for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end(); AI != E; ++AI) { Vals.push_back(VE.getTypeID(AI->getType())); Vals.push_back(VE.getValueID(AI->getAliasee())); Vals.push_back(getEncodedLinkage(AI)); Vals.push_back(getEncodedVisibility(AI)); unsigned AbbrevToUse = 0; Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); Vals.clear(); } } static void WriteConstants(unsigned FirstVal, unsigned LastVal, const ValueEnumerator &VE, BitstreamWriter &Stream, bool isGlobal) { if (FirstVal == LastVal) return; Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); unsigned AggregateAbbrev = 0; unsigned String8Abbrev = 0; unsigned CString7Abbrev = 0; unsigned CString6Abbrev = 0; unsigned MDString8Abbrev = 0; unsigned MDString6Abbrev = 0; // If this is a constant pool for the module, emit module-specific abbrevs. if (isGlobal) { // Abbrev for CST_CODE_AGGREGATE. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); AggregateAbbrev = Stream.EmitAbbrev(Abbv); // Abbrev for CST_CODE_STRING. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); String8Abbrev = Stream.EmitAbbrev(Abbv); // Abbrev for CST_CODE_CSTRING. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); CString7Abbrev = Stream.EmitAbbrev(Abbv); // Abbrev for CST_CODE_CSTRING. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); CString6Abbrev = Stream.EmitAbbrev(Abbv); // Abbrev for CST_CODE_MDSTRING. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_MDSTRING)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); MDString8Abbrev = Stream.EmitAbbrev(Abbv); // Abbrev for CST_CODE_MDSTRING. Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_MDSTRING)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); MDString6Abbrev = Stream.EmitAbbrev(Abbv); } SmallVector Record; const ValueEnumerator::ValueList &Vals = VE.getValues(); const Type *LastTy = 0; for (unsigned i = FirstVal; i != LastVal; ++i) { const Value *V = Vals[i].first; // If we need to switch types, do so now. if (V->getType() != LastTy) { LastTy = V->getType(); Record.push_back(VE.getTypeID(LastTy)); Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, CONSTANTS_SETTYPE_ABBREV); Record.clear(); } if (const InlineAsm *IA = dyn_cast(V)) { Record.push_back(unsigned(IA->hasSideEffects())); // Add the asm string. const std::string &AsmStr = IA->getAsmString(); Record.push_back(AsmStr.size()); for (unsigned i = 0, e = AsmStr.size(); i != e; ++i) Record.push_back(AsmStr[i]); // Add the constraint string. const std::string &ConstraintStr = IA->getConstraintString(); Record.push_back(ConstraintStr.size()); for (unsigned i = 0, e = ConstraintStr.size(); i != e; ++i) Record.push_back(ConstraintStr[i]); Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); Record.clear(); continue; } const Constant *C = cast(V); unsigned Code = -1U; unsigned AbbrevToUse = 0; if (C->isNullValue()) { Code = bitc::CST_CODE_NULL; } else if (isa(C)) { Code = bitc::CST_CODE_UNDEF; } else if (const ConstantInt *IV = dyn_cast(C)) { if (IV->getBitWidth() <= 64) { int64_t V = IV->getSExtValue(); if (V >= 0) Record.push_back(V << 1); else Record.push_back((-V << 1) | 1); Code = bitc::CST_CODE_INTEGER; AbbrevToUse = CONSTANTS_INTEGER_ABBREV; } else { // Wide integers, > 64 bits in size. // We have an arbitrary precision integer value to write whose // bit width is > 64. However, in canonical unsigned integer // format it is likely that the high bits are going to be zero. // So, we only write the number of active words. unsigned NWords = IV->getValue().getActiveWords(); const uint64_t *RawWords = IV->getValue().getRawData(); for (unsigned i = 0; i != NWords; ++i) { int64_t V = RawWords[i]; if (V >= 0) Record.push_back(V << 1); else Record.push_back((-V << 1) | 1); } Code = bitc::CST_CODE_WIDE_INTEGER; } } else if (const ConstantFP *CFP = dyn_cast(C)) { Code = bitc::CST_CODE_FLOAT; const Type *Ty = CFP->getType(); if (Ty == Type::FloatTy || Ty == Type::DoubleTy) { Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); } else if (Ty == Type::X86_FP80Ty) { // api needed to prevent premature destruction // bits are not in the same order as a normal i80 APInt, compensate. APInt api = CFP->getValueAPF().bitcastToAPInt(); const uint64_t *p = api.getRawData(); Record.push_back((p[1] << 48) | (p[0] >> 16)); Record.push_back(p[0] & 0xffffLL); } else if (Ty == Type::FP128Ty || Ty == Type::PPC_FP128Ty) { APInt api = CFP->getValueAPF().bitcastToAPInt(); const uint64_t *p = api.getRawData(); Record.push_back(p[0]); Record.push_back(p[1]); } else { assert (0 && "Unknown FP type!"); } } else if (isa(C) && cast(C)->isString()) { // Emit constant strings specially. unsigned NumOps = C->getNumOperands(); // If this is a null-terminated string, use the denser CSTRING encoding. if (C->getOperand(NumOps-1)->isNullValue()) { Code = bitc::CST_CODE_CSTRING; --NumOps; // Don't encode the null, which isn't allowed by char6. } else { Code = bitc::CST_CODE_STRING; AbbrevToUse = String8Abbrev; } bool isCStr7 = Code == bitc::CST_CODE_CSTRING; bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; for (unsigned i = 0; i != NumOps; ++i) { unsigned char V = cast(C->getOperand(i))->getZExtValue(); Record.push_back(V); isCStr7 &= (V & 128) == 0; if (isCStrChar6) isCStrChar6 = BitCodeAbbrevOp::isChar6(V); } if (isCStrChar6) AbbrevToUse = CString6Abbrev; else if (isCStr7) AbbrevToUse = CString7Abbrev; } else if (isa(C) || isa(V) || isa(V)) { Code = bitc::CST_CODE_AGGREGATE; for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) Record.push_back(VE.getValueID(C->getOperand(i))); AbbrevToUse = AggregateAbbrev; } else if (const ConstantExpr *CE = dyn_cast(C)) { switch (CE->getOpcode()) { default: if (Instruction::isCast(CE->getOpcode())) { Code = bitc::CST_CODE_CE_CAST; Record.push_back(GetEncodedCastOpcode(CE->getOpcode())); Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); Record.push_back(VE.getValueID(C->getOperand(0))); AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; } else { assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); Code = bitc::CST_CODE_CE_BINOP; Record.push_back(GetEncodedBinaryOpcode(CE->getOpcode())); Record.push_back(VE.getValueID(C->getOperand(0))); Record.push_back(VE.getValueID(C->getOperand(1))); } break; case Instruction::GetElementPtr: Code = bitc::CST_CODE_CE_GEP; for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); Record.push_back(VE.getValueID(C->getOperand(i))); } break; case Instruction::Select: Code = bitc::CST_CODE_CE_SELECT; Record.push_back(VE.getValueID(C->getOperand(0))); Record.push_back(VE.getValueID(C->getOperand(1))); Record.push_back(VE.getValueID(C->getOperand(2))); break; case Instruction::ExtractElement: Code = bitc::CST_CODE_CE_EXTRACTELT; Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); Record.push_back(VE.getValueID(C->getOperand(0))); Record.push_back(VE.getValueID(C->getOperand(1))); break; case Instruction::InsertElement: Code = bitc::CST_CODE_CE_INSERTELT; Record.push_back(VE.getValueID(C->getOperand(0))); Record.push_back(VE.getValueID(C->getOperand(1))); Record.push_back(VE.getValueID(C->getOperand(2))); break; case Instruction::ShuffleVector: // If the return type and argument types are the same, this is a // standard shufflevector instruction. If the types are different, // then the shuffle is widening or truncating the input vectors, and // the argument type must also be encoded. if (C->getType() == C->getOperand(0)->getType()) { Code = bitc::CST_CODE_CE_SHUFFLEVEC; } else { Code = bitc::CST_CODE_CE_SHUFVEC_EX; Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); } Record.push_back(VE.getValueID(C->getOperand(0))); Record.push_back(VE.getValueID(C->getOperand(1))); Record.push_back(VE.getValueID(C->getOperand(2))); break; case Instruction::ICmp: case Instruction::FCmp: case Instruction::VICmp: case Instruction::VFCmp: if (isa(C->getOperand(0)->getType()) && (CE->getOpcode() == Instruction::ICmp || CE->getOpcode() == Instruction::FCmp)) { // compare returning vector of Int1Ty assert(0 && "Unsupported constant!"); } else { Code = bitc::CST_CODE_CE_CMP; } Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); Record.push_back(VE.getValueID(C->getOperand(0))); Record.push_back(VE.getValueID(C->getOperand(1))); Record.push_back(CE->getPredicate()); break; } } else if (const MDString *S = dyn_cast(C)) { Code = bitc::CST_CODE_MDSTRING; AbbrevToUse = MDString6Abbrev; for (unsigned i = 0, e = S->size(); i != e; ++i) { char V = S->begin()[i]; Record.push_back(V); if (!BitCodeAbbrevOp::isChar6(V)) AbbrevToUse = MDString8Abbrev; } } else if (const MDNode *N = dyn_cast(C)) { Code = bitc::CST_CODE_MDNODE; for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { Record.push_back(VE.getTypeID(N->getOperand(i)->getType())); Record.push_back(VE.getValueID(N->getOperand(i))); } } else { assert(0 && "Unknown constant!"); } Stream.EmitRecord(Code, Record, AbbrevToUse); Record.clear(); } Stream.ExitBlock(); } static void WriteModuleConstants(const ValueEnumerator &VE, BitstreamWriter &Stream) { const ValueEnumerator::ValueList &Vals = VE.getValues(); // Find the first constant to emit, which is the first non-globalvalue value. // We know globalvalues have been emitted by WriteModuleInfo. for (unsigned i = 0, e = Vals.size(); i != e; ++i) { if (!isa(Vals[i].first)) { WriteConstants(i, Vals.size(), VE, Stream, true); return; } } } /// PushValueAndType - The file has to encode both the value and type id for /// many values, because we need to know what type to create for forward /// references. However, most operands are not forward references, so this type /// field is not needed. /// /// This function adds V's value ID to Vals. If the value ID is higher than the /// instruction ID, then it is a forward reference, and it also includes the /// type ID. static bool PushValueAndType(const Value *V, unsigned InstID, SmallVector &Vals, ValueEnumerator &VE) { unsigned ValID = VE.getValueID(V); Vals.push_back(ValID); if (ValID >= InstID) { Vals.push_back(VE.getTypeID(V->getType())); return true; } return false; } /// WriteInstruction - Emit an instruction to the specified stream. static void WriteInstruction(const Instruction &I, unsigned InstID, ValueEnumerator &VE, BitstreamWriter &Stream, SmallVector &Vals) { unsigned Code = 0; unsigned AbbrevToUse = 0; switch (I.getOpcode()) { default: if (Instruction::isCast(I.getOpcode())) { Code = bitc::FUNC_CODE_INST_CAST; if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) AbbrevToUse = FUNCTION_INST_CAST_ABBREV; Vals.push_back(VE.getTypeID(I.getType())); Vals.push_back(GetEncodedCastOpcode(I.getOpcode())); } else { assert(isa(I) && "Unknown instruction!"); Code = bitc::FUNC_CODE_INST_BINOP; if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; Vals.push_back(VE.getValueID(I.getOperand(1))); Vals.push_back(GetEncodedBinaryOpcode(I.getOpcode())); } break; case Instruction::GetElementPtr: Code = bitc::FUNC_CODE_INST_GEP; for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) PushValueAndType(I.getOperand(i), InstID, Vals, VE); break; case Instruction::ExtractValue: { Code = bitc::FUNC_CODE_INST_EXTRACTVAL; PushValueAndType(I.getOperand(0), InstID, Vals, VE); const ExtractValueInst *EVI = cast(&I); for (const unsigned *i = EVI->idx_begin(), *e = EVI->idx_end(); i != e; ++i) Vals.push_back(*i); break; } case Instruction::InsertValue: { Code = bitc::FUNC_CODE_INST_INSERTVAL; PushValueAndType(I.getOperand(0), InstID, Vals, VE); PushValueAndType(I.getOperand(1), InstID, Vals, VE); const InsertValueInst *IVI = cast(&I); for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i) Vals.push_back(*i); break; } case Instruction::Select: Code = bitc::FUNC_CODE_INST_VSELECT; PushValueAndType(I.getOperand(1), InstID, Vals, VE); Vals.push_back(VE.getValueID(I.getOperand(2))); PushValueAndType(I.getOperand(0), InstID, Vals, VE); break; case Instruction::ExtractElement: Code = bitc::FUNC_CODE_INST_EXTRACTELT; PushValueAndType(I.getOperand(0), InstID, Vals, VE); Vals.push_back(VE.getValueID(I.getOperand(1))); break; case Instruction::InsertElement: Code = bitc::FUNC_CODE_INST_INSERTELT; PushValueAndType(I.getOperand(0), InstID, Vals, VE); Vals.push_back(VE.getValueID(I.getOperand(1))); Vals.push_back(VE.getValueID(I.getOperand(2))); break; case Instruction::ShuffleVector: Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; PushValueAndType(I.getOperand(0), InstID, Vals, VE); Vals.push_back(VE.getValueID(I.getOperand(1))); Vals.push_back(VE.getValueID(I.getOperand(2))); break; case Instruction::ICmp: case Instruction::FCmp: case Instruction::VICmp: case Instruction::VFCmp: if (I.getOpcode() == Instruction::ICmp || I.getOpcode() == Instruction::FCmp) { // compare returning Int1Ty or vector of Int1Ty Code = bitc::FUNC_CODE_INST_CMP2; } else { Code = bitc::FUNC_CODE_INST_CMP; } PushValueAndType(I.getOperand(0), InstID, Vals, VE); Vals.push_back(VE.getValueID(I.getOperand(1))); Vals.push_back(cast(I).getPredicate()); break; case Instruction::Ret: { Code = bitc::FUNC_CODE_INST_RET; unsigned NumOperands = I.getNumOperands(); if (NumOperands == 0) AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; else if (NumOperands == 1) { if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; } else { for (unsigned i = 0, e = NumOperands; i != e; ++i) PushValueAndType(I.getOperand(i), InstID, Vals, VE); } } break; case Instruction::Br: { Code = bitc::FUNC_CODE_INST_BR; BranchInst &II(cast(I)); Vals.push_back(VE.getValueID(II.getSuccessor(0))); if (II.isConditional()) { Vals.push_back(VE.getValueID(II.getSuccessor(1))); Vals.push_back(VE.getValueID(II.getCondition())); } } break; case Instruction::Switch: Code = bitc::FUNC_CODE_INST_SWITCH; Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) Vals.push_back(VE.getValueID(I.getOperand(i))); break; case Instruction::Invoke: { const InvokeInst *II = cast(&I); const Value *Callee(II->getCalledValue()); const PointerType *PTy = cast(Callee->getType()); const FunctionType *FTy = cast(PTy->getElementType()); Code = bitc::FUNC_CODE_INST_INVOKE; Vals.push_back(VE.getAttributeID(II->getAttributes())); Vals.push_back(II->getCallingConv()); Vals.push_back(VE.getValueID(II->getNormalDest())); Vals.push_back(VE.getValueID(II->getUnwindDest())); PushValueAndType(Callee, InstID, Vals, VE); // Emit value #'s for the fixed parameters. for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) Vals.push_back(VE.getValueID(I.getOperand(i+3))); // fixed param. // Emit type/value pairs for varargs params. if (FTy->isVarArg()) { for (unsigned i = 3+FTy->getNumParams(), e = I.getNumOperands(); i != e; ++i) PushValueAndType(I.getOperand(i), InstID, Vals, VE); // vararg } break; } case Instruction::Unwind: Code = bitc::FUNC_CODE_INST_UNWIND; break; case Instruction::Unreachable: Code = bitc::FUNC_CODE_INST_UNREACHABLE; AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; break; case Instruction::PHI: Code = bitc::FUNC_CODE_INST_PHI; Vals.push_back(VE.getTypeID(I.getType())); for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) Vals.push_back(VE.getValueID(I.getOperand(i))); break; case Instruction::Malloc: Code = bitc::FUNC_CODE_INST_MALLOC; Vals.push_back(VE.getTypeID(I.getType())); Vals.push_back(VE.getValueID(I.getOperand(0))); // size. Vals.push_back(Log2_32(cast(I).getAlignment())+1); break; case Instruction::Free: Code = bitc::FUNC_CODE_INST_FREE; PushValueAndType(I.getOperand(0), InstID, Vals, VE); break; case Instruction::Alloca: Code = bitc::FUNC_CODE_INST_ALLOCA; Vals.push_back(VE.getTypeID(I.getType())); Vals.push_back(VE.getValueID(I.getOperand(0))); // size. Vals.push_back(Log2_32(cast(I).getAlignment())+1); break; case Instruction::Load: Code = bitc::FUNC_CODE_INST_LOAD; if (!PushValueAndType(I.getOperand(0), InstID, Vals, VE)) // ptr AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; Vals.push_back(Log2_32(cast(I).getAlignment())+1); Vals.push_back(cast(I).isVolatile()); break; case Instruction::Store: Code = bitc::FUNC_CODE_INST_STORE2; PushValueAndType(I.getOperand(1), InstID, Vals, VE); // ptrty + ptr Vals.push_back(VE.getValueID(I.getOperand(0))); // val. Vals.push_back(Log2_32(cast(I).getAlignment())+1); Vals.push_back(cast(I).isVolatile()); break; case Instruction::Call: { const PointerType *PTy = cast(I.getOperand(0)->getType()); const FunctionType *FTy = cast(PTy->getElementType()); Code = bitc::FUNC_CODE_INST_CALL; const CallInst *CI = cast(&I); Vals.push_back(VE.getAttributeID(CI->getAttributes())); Vals.push_back((CI->getCallingConv() << 1) | unsigned(CI->isTailCall())); PushValueAndType(CI->getOperand(0), InstID, Vals, VE); // Callee // Emit value #'s for the fixed parameters. for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) Vals.push_back(VE.getValueID(I.getOperand(i+1))); // fixed param. // Emit type/value pairs for varargs params. if (FTy->isVarArg()) { unsigned NumVarargs = I.getNumOperands()-1-FTy->getNumParams(); for (unsigned i = I.getNumOperands()-NumVarargs, e = I.getNumOperands(); i != e; ++i) PushValueAndType(I.getOperand(i), InstID, Vals, VE); // varargs } break; } case Instruction::VAArg: Code = bitc::FUNC_CODE_INST_VAARG; Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); // valistty Vals.push_back(VE.getValueID(I.getOperand(0))); // valist. Vals.push_back(VE.getTypeID(I.getType())); // restype. break; } Stream.EmitRecord(Code, Vals, AbbrevToUse); Vals.clear(); } // Emit names for globals/functions etc. static void WriteValueSymbolTable(const ValueSymbolTable &VST, const ValueEnumerator &VE, BitstreamWriter &Stream) { if (VST.empty()) return; Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); // FIXME: Set up the abbrev, we know how many values there are! // FIXME: We know if the type names can use 7-bit ascii. SmallVector NameVals; for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end(); SI != SE; ++SI) { const ValueName &Name = *SI; // Figure out the encoding to use for the name. bool is7Bit = true; bool isChar6 = true; for (const char *C = Name.getKeyData(), *E = C+Name.getKeyLength(); C != E; ++C) { if (isChar6) isChar6 = BitCodeAbbrevOp::isChar6(*C); if ((unsigned char)*C & 128) { is7Bit = false; break; // don't bother scanning the rest. } } unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; // VST_ENTRY: [valueid, namechar x N] // VST_BBENTRY: [bbid, namechar x N] unsigned Code; if (isa(SI->getValue())) { Code = bitc::VST_CODE_BBENTRY; if (isChar6) AbbrevToUse = VST_BBENTRY_6_ABBREV; } else { Code = bitc::VST_CODE_ENTRY; if (isChar6) AbbrevToUse = VST_ENTRY_6_ABBREV; else if (is7Bit) AbbrevToUse = VST_ENTRY_7_ABBREV; } NameVals.push_back(VE.getValueID(SI->getValue())); for (const char *P = Name.getKeyData(), *E = Name.getKeyData()+Name.getKeyLength(); P != E; ++P) NameVals.push_back((unsigned char)*P); // Emit the finished record. Stream.EmitRecord(Code, NameVals, AbbrevToUse); NameVals.clear(); } Stream.ExitBlock(); } /// WriteFunction - Emit a function body to the module stream. static void WriteFunction(const Function &F, ValueEnumerator &VE, BitstreamWriter &Stream) { Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); VE.incorporateFunction(F); SmallVector Vals; // Emit the number of basic blocks, so the reader can create them ahead of // time. Vals.push_back(VE.getBasicBlocks().size()); Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); Vals.clear(); // If there are function-local constants, emit them now. unsigned CstStart, CstEnd; VE.getFunctionConstantRange(CstStart, CstEnd); WriteConstants(CstStart, CstEnd, VE, Stream, false); // Keep a running idea of what the instruction ID is. unsigned InstID = CstEnd; // Finally, emit all the instructions, in order. for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I) { WriteInstruction(*I, InstID, VE, Stream, Vals); if (I->getType() != Type::VoidTy) ++InstID; } // Emit names for all the instructions etc. WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream); VE.purgeFunction(); Stream.ExitBlock(); } /// WriteTypeSymbolTable - Emit a block for the specified type symtab. static void WriteTypeSymbolTable(const TypeSymbolTable &TST, const ValueEnumerator &VE, BitstreamWriter &Stream) { if (TST.empty()) return; Stream.EnterSubblock(bitc::TYPE_SYMTAB_BLOCK_ID, 3); // 7-bit fixed width VST_CODE_ENTRY strings. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(VE.getTypes().size()+1))); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); unsigned V7Abbrev = Stream.EmitAbbrev(Abbv); SmallVector NameVals; for (TypeSymbolTable::const_iterator TI = TST.begin(), TE = TST.end(); TI != TE; ++TI) { // TST_ENTRY: [typeid, namechar x N] NameVals.push_back(VE.getTypeID(TI->second)); const std::string &Str = TI->first; bool is7Bit = true; for (unsigned i = 0, e = Str.size(); i != e; ++i) { NameVals.push_back((unsigned char)Str[i]); if (Str[i] & 128) is7Bit = false; } // Emit the finished record. Stream.EmitRecord(bitc::VST_CODE_ENTRY, NameVals, is7Bit ? V7Abbrev : 0); NameVals.clear(); } Stream.ExitBlock(); } // Emit blockinfo, which defines the standard abbreviations etc. static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) { // We only want to emit block info records for blocks that have multiple // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. Other // blocks can defined their abbrevs inline. Stream.EnterBlockInfoBlock(2); { // 8-bit fixed-width VST_ENTRY/VST_BBENTRY strings. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != VST_ENTRY_8_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // 7-bit fixed width VST_ENTRY strings. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != VST_ENTRY_7_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // 6-bit char6 VST_ENTRY strings. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != VST_ENTRY_6_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // 6-bit char6 VST_BBENTRY strings. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != VST_BBENTRY_6_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // SETTYPE abbrev for CONSTANTS_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(VE.getTypes().size()+1))); if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != CONSTANTS_SETTYPE_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // INTEGER abbrev for CONSTANTS_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != CONSTANTS_INTEGER_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // CE_CAST abbrev for CONSTANTS_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // cast opc Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid Log2_32_Ceil(VE.getTypes().size()+1))); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != CONSTANTS_CE_CAST_Abbrev) assert(0 && "Unexpected abbrev ordering!"); } { // NULL abbrev for CONSTANTS_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != CONSTANTS_NULL_Abbrev) assert(0 && "Unexpected abbrev ordering!"); } // FIXME: This should only use space for first class types! { // INST_LOAD abbrev for FUNCTION_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != FUNCTION_INST_LOAD_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // INST_BINOP abbrev for FUNCTION_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != FUNCTION_INST_BINOP_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // INST_CAST abbrev for FUNCTION_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // OpVal Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty Log2_32_Ceil(VE.getTypes().size()+1))); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != FUNCTION_INST_CAST_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // INST_RET abbrev for FUNCTION_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != FUNCTION_INST_RET_VOID_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // INST_RET abbrev for FUNCTION_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != FUNCTION_INST_RET_VAL_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. BitCodeAbbrev *Abbv = new BitCodeAbbrev(); Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != FUNCTION_INST_UNREACHABLE_ABBREV) assert(0 && "Unexpected abbrev ordering!"); } Stream.ExitBlock(); } /// WriteModule - Emit the specified module to the bitstream. static void WriteModule(const Module *M, BitstreamWriter &Stream) { Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); // Emit the version number if it is non-zero. if (CurVersion) { SmallVector Vals; Vals.push_back(CurVersion); Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals); } // Analyze the module, enumerating globals, functions, etc. ValueEnumerator VE(M); // Emit blockinfo, which defines the standard abbreviations etc. WriteBlockInfo(VE, Stream); // Emit information about parameter attributes. WriteAttributeTable(VE, Stream); // Emit information describing all of the types in the module. WriteTypeTable(VE, Stream); // Emit top-level description of module, including target triple, inline asm, // descriptors for global variables, and function prototype info. WriteModuleInfo(M, VE, Stream); // Emit constants. WriteModuleConstants(VE, Stream); // If we have any aggregate values in the value table, purge them - these can // only be used to initialize global variables. Doing so makes the value // namespace smaller for code in functions. int NumNonAggregates = VE.PurgeAggregateValues(); if (NumNonAggregates != -1) { SmallVector Vals; Vals.push_back(NumNonAggregates); Stream.EmitRecord(bitc::MODULE_CODE_PURGEVALS, Vals); } // Emit function bodies. for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) if (!I->isDeclaration()) WriteFunction(*I, VE, Stream); // Emit the type symbol table information. WriteTypeSymbolTable(M->getTypeSymbolTable(), VE, Stream); // Emit names for globals/functions etc. WriteValueSymbolTable(M->getValueSymbolTable(), VE, Stream); Stream.ExitBlock(); } /// EmitDarwinBCHeader - If generating a bc file on darwin, we have to emit a /// header and trailer to make it compatible with the system archiver. To do /// this we emit the following header, and then emit a trailer that pads the /// file out to be a multiple of 16 bytes. /// /// struct bc_header { /// uint32_t Magic; // 0x0B17C0DE /// uint32_t Version; // Version, currently always 0. /// uint32_t BitcodeOffset; // Offset to traditional bitcode file. /// uint32_t BitcodeSize; // Size of traditional bitcode file. /// uint32_t CPUType; // CPU specifier. /// ... potentially more later ... /// }; enum { DarwinBCSizeFieldOffset = 3*4, // Offset to bitcode_size. DarwinBCHeaderSize = 5*4 }; static void EmitDarwinBCHeader(BitstreamWriter &Stream, const std::string &TT) { unsigned CPUType = ~0U; // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*. The CPUType is a // magic number from /usr/include/mach/machine.h. It is ok to reproduce the // specific constants here because they are implicitly part of the Darwin ABI. enum { DARWIN_CPU_ARCH_ABI64 = 0x01000000, DARWIN_CPU_TYPE_X86 = 7, DARWIN_CPU_TYPE_POWERPC = 18 }; if (TT.find("x86_64-") == 0) CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; else if (TT.size() >= 5 && TT[0] == 'i' && TT[2] == '8' && TT[3] == '6' && TT[4] == '-' && TT[1] - '3' < 6) CPUType = DARWIN_CPU_TYPE_X86; else if (TT.find("powerpc-") == 0) CPUType = DARWIN_CPU_TYPE_POWERPC; else if (TT.find("powerpc64-") == 0) CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; // Traditional Bitcode starts after header. unsigned BCOffset = DarwinBCHeaderSize; Stream.Emit(0x0B17C0DE, 32); Stream.Emit(0 , 32); // Version. Stream.Emit(BCOffset , 32); Stream.Emit(0 , 32); // Filled in later. Stream.Emit(CPUType , 32); } /// EmitDarwinBCTrailer - Emit the darwin epilog after the bitcode file and /// finalize the header. static void EmitDarwinBCTrailer(BitstreamWriter &Stream, unsigned BufferSize) { // Update the size field in the header. Stream.BackpatchWord(DarwinBCSizeFieldOffset, BufferSize-DarwinBCHeaderSize); // If the file is not a multiple of 16 bytes, insert dummy padding. while (BufferSize & 15) { Stream.Emit(0, 8); ++BufferSize; } } /// WriteBitcodeToFile - Write the specified module to the specified output /// stream. void llvm::WriteBitcodeToFile(const Module *M, std::ostream &Out) { raw_os_ostream RawOut(Out); // If writing to stdout, set binary mode. if (llvm::cout == Out) sys::Program::ChangeStdoutToBinary(); WriteBitcodeToFile(M, RawOut); } /// WriteBitcodeToFile - Write the specified module to the specified output /// stream. void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) { std::vector Buffer; BitstreamWriter Stream(Buffer); Buffer.reserve(256*1024); WriteBitcodeToStream( M, Stream ); // If writing to stdout, set binary mode. if (&llvm::outs() == &Out) sys::Program::ChangeStdoutToBinary(); // Write the generated bitstream to "Out". Out.write((char*)&Buffer.front(), Buffer.size()); // Make sure it hits disk now. Out.flush(); } /// WriteBitcodeToStream - Write the specified module to the specified output /// stream. void llvm::WriteBitcodeToStream(const Module *M, BitstreamWriter &Stream) { // If this is darwin, emit a file header and trailer if needed. bool isDarwin = M->getTargetTriple().find("-darwin") != std::string::npos; if (isDarwin) EmitDarwinBCHeader(Stream, M->getTargetTriple()); // Emit the file header. Stream.Emit((unsigned)'B', 8); Stream.Emit((unsigned)'C', 8); Stream.Emit(0x0, 4); Stream.Emit(0xC, 4); Stream.Emit(0xE, 4); Stream.Emit(0xD, 4); // Emit the module. WriteModule(M, Stream); if (isDarwin) EmitDarwinBCTrailer(Stream, Stream.getBuffer().size()); }