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llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
Dale Johannesen bb811a2445 Add X86 MMX type to bitcode and Type. 
(The Ada bindings probably need it too, but all the
obvious places to change say "do not edit this file".)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113618 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-10 20:55:01 +00:00

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//===--- 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/Operator.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/ValueSymbolTable.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.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_BINOP_FLAGS_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: llvm_unreachable("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: llvm_unreachable("Unknown binary instruction!");
case Instruction::Add:
case Instruction::FAdd: return bitc::BINOP_ADD;
case Instruction::Sub:
case Instruction::FSub: return bitc::BINOP_SUB;
case Instruction::Mul:
case Instruction::FMul: 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<unsigned, 64> 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<AttrListPtr> &Attrs = VE.getAttributes();
if (Attrs.empty()) return;
Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
SmallVector<uint64_t, 64> 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<uint64_t, 64> 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: llvm_unreachable("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::MetadataTyID: Code = bitc::TYPE_CODE_METADATA; break;
case Type::X86_MMXTyID: Code = bitc::TYPE_CODE_X86_MMX; break;
case Type::IntegerTyID:
// INTEGER: [width]
Code = bitc::TYPE_CODE_INTEGER;
TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
break;
case Type::PointerTyID: {
const PointerType *PTy = cast<PointerType>(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<FunctionType>(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<StructType>(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<ArrayType>(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<VectorType>(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: llvm_unreachable("Invalid linkage!");
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;
case GlobalValue::LinkerPrivateLinkage: return 13;
case GlobalValue::LinkerPrivateWeakLinkage: return 14;
case GlobalValue::LinkerPrivateWeakDefAutoLinkage: return 15;
}
}
static unsigned getEncodedVisibility(const GlobalValue *GV) {
switch (GV->getVisibility()) {
default: llvm_unreachable("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<std::string, unsigned> SectionMap;
std::map<std::string, unsigned> 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<unsigned, 64> 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 uint64_t GetOptimizationFlags(const Value *V) {
uint64_t Flags = 0;
if (const OverflowingBinaryOperator *OBO =
dyn_cast<OverflowingBinaryOperator>(V)) {
if (OBO->hasNoSignedWrap())
Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
if (OBO->hasNoUnsignedWrap())
Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
} else if (const SDivOperator *Div = dyn_cast<SDivOperator>(V)) {
if (Div->isExact())
Flags |= 1 << bitc::SDIV_EXACT;
}
return Flags;
}
static void WriteMDNode(const MDNode *N,
const ValueEnumerator &VE,
BitstreamWriter &Stream,
SmallVector<uint64_t, 64> &Record) {
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
if (N->getOperand(i)) {
Record.push_back(VE.getTypeID(N->getOperand(i)->getType()));
Record.push_back(VE.getValueID(N->getOperand(i)));
} else {
Record.push_back(VE.getTypeID(Type::getVoidTy(N->getContext())));
Record.push_back(0);
}
}
unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE2 :
bitc::METADATA_NODE2;
Stream.EmitRecord(MDCode, Record, 0);
Record.clear();
}
static void WriteModuleMetadata(const Module *M,
const ValueEnumerator &VE,
BitstreamWriter &Stream) {
const ValueEnumerator::ValueList &Vals = VE.getMDValues();
bool StartedMetadataBlock = false;
unsigned MDSAbbrev = 0;
SmallVector<uint64_t, 64> Record;
for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
if (const MDNode *N = dyn_cast<MDNode>(Vals[i].first)) {
if (!N->isFunctionLocal() || !N->getFunction()) {
if (!StartedMetadataBlock) {
Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
StartedMetadataBlock = true;
}
WriteMDNode(N, VE, Stream, Record);
}
} else if (const MDString *MDS = dyn_cast<MDString>(Vals[i].first)) {
if (!StartedMetadataBlock) {
Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
// Abbrev for METADATA_STRING.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRING));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
MDSAbbrev = Stream.EmitAbbrev(Abbv);
StartedMetadataBlock = true;
}
// Code: [strchar x N]
Record.append(MDS->begin(), MDS->end());
// Emit the finished record.
Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);
Record.clear();
}
}
// Write named metadata.
for (Module::const_named_metadata_iterator I = M->named_metadata_begin(),
E = M->named_metadata_end(); I != E; ++I) {
const NamedMDNode *NMD = I;
if (!StartedMetadataBlock) {
Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
StartedMetadataBlock = true;
}
// Write name.
StringRef Str = NMD->getName();
for (unsigned i = 0, e = Str.size(); i != e; ++i)
Record.push_back(Str[i]);
Stream.EmitRecord(bitc::METADATA_NAME, Record, 0/*TODO*/);
Record.clear();
// Write named metadata operands.
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
Record.push_back(VE.getValueID(NMD->getOperand(i)));
Stream.EmitRecord(bitc::METADATA_NAMED_NODE2, Record, 0);
Record.clear();
}
if (StartedMetadataBlock)
Stream.ExitBlock();
}
static void WriteFunctionLocalMetadata(const Function &F,
const ValueEnumerator &VE,
BitstreamWriter &Stream) {
bool StartedMetadataBlock = false;
SmallVector<uint64_t, 64> Record;
const SmallVector<const MDNode *, 8> &Vals = VE.getFunctionLocalMDValues();
for (unsigned i = 0, e = Vals.size(); i != e; ++i)
if (const MDNode *N = Vals[i])
if (N->isFunctionLocal() && N->getFunction() == &F) {
if (!StartedMetadataBlock) {
Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
StartedMetadataBlock = true;
}
WriteMDNode(N, VE, Stream, Record);
}
if (StartedMetadataBlock)
Stream.ExitBlock();
}
static void WriteMetadataAttachment(const Function &F,
const ValueEnumerator &VE,
BitstreamWriter &Stream) {
Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
SmallVector<uint64_t, 64> Record;
// Write metadata attachments
// METADATA_ATTACHMENT2 - [m x [value, [n x [id, mdnode]]]
SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
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) {
MDs.clear();
I->getAllMetadataOtherThanDebugLoc(MDs);
// If no metadata, ignore instruction.
if (MDs.empty()) continue;
Record.push_back(VE.getInstructionID(I));
for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
Record.push_back(MDs[i].first);
Record.push_back(VE.getValueID(MDs[i].second));
}
Stream.EmitRecord(bitc::METADATA_ATTACHMENT2, Record, 0);
Record.clear();
}
Stream.ExitBlock();
}
static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
SmallVector<uint64_t, 64> Record;
// Write metadata kinds
// METADATA_KIND - [n x [id, name]]
SmallVector<StringRef, 4> Names;
M->getMDKindNames(Names);
if (Names.empty()) return;
Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
Record.push_back(MDKindID);
StringRef KName = Names[MDKindID];
Record.append(KName.begin(), KName.end());
Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
Record.clear();
}
Stream.ExitBlock();
}
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;
// 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);
}
SmallVector<uint64_t, 64> 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<InlineAsm>(V)) {
Record.push_back(unsigned(IA->hasSideEffects()) |
unsigned(IA->isAlignStack()) << 1);
// 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<Constant>(V);
unsigned Code = -1U;
unsigned AbbrevToUse = 0;
if (C->isNullValue()) {
Code = bitc::CST_CODE_NULL;
} else if (isa<UndefValue>(C)) {
Code = bitc::CST_CODE_UNDEF;
} else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
if (IV->getBitWidth() <= 64) {
uint64_t V = IV->getSExtValue();
if ((int64_t)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<ConstantFP>(C)) {
Code = bitc::CST_CODE_FLOAT;
const Type *Ty = CFP->getType();
if (Ty->isFloatTy() || Ty->isDoubleTy()) {
Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
} else if (Ty->isX86_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->isFP128Ty() || Ty->isPPC_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<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
const ConstantArray *CA = cast<ConstantArray>(C);
// Emit constant strings specially.
unsigned NumOps = CA->getNumOperands();
// If this is a null-terminated string, use the denser CSTRING encoding.
if (CA->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<ConstantInt>(CA->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<ConstantArray>(C) || isa<ConstantStruct>(V) ||
isa<ConstantVector>(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<ConstantExpr>(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)));
uint64_t Flags = GetOptimizationFlags(CE);
if (Flags != 0)
Record.push_back(Flags);
}
break;
case Instruction::GetElementPtr:
Code = bitc::CST_CODE_CE_GEP;
if (cast<GEPOperator>(C)->isInBounds())
Code = bitc::CST_CODE_CE_INBOUNDS_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:
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 BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
assert(BA->getFunction() == BA->getBasicBlock()->getParent() &&
"Malformed blockaddress");
Code = bitc::CST_CODE_BLOCKADDRESS;
Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
Record.push_back(VE.getValueID(BA->getFunction()));
Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
} else {
#ifndef NDEBUG
C->dump();
#endif
llvm_unreachable("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<GlobalValue>(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<unsigned, 64> &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<unsigned, 64> &Vals) {
unsigned Code = 0;
unsigned AbbrevToUse = 0;
VE.setInstructionID(&I);
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<BinaryOperator>(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()));
uint64_t Flags = GetOptimizationFlags(&I);
if (Flags != 0) {
if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
Vals.push_back(Flags);
}
}
break;
case Instruction::GetElementPtr:
Code = bitc::FUNC_CODE_INST_GEP;
if (cast<GEPOperator>(&I)->isInBounds())
Code = bitc::FUNC_CODE_INST_INBOUNDS_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<ExtractValueInst>(&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<InsertValueInst>(&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:
// compare returning Int1Ty or vector of Int1Ty
Code = bitc::FUNC_CODE_INST_CMP2;
PushValueAndType(I.getOperand(0), InstID, Vals, VE);
Vals.push_back(VE.getValueID(I.getOperand(1)));
Vals.push_back(cast<CmpInst>(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<BranchInst>(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::IndirectBr:
Code = bitc::FUNC_CODE_INST_INDIRECTBR;
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<InvokeInst>(&I);
const Value *Callee(II->getCalledValue());
const PointerType *PTy = cast<PointerType>(Callee->getType());
const FunctionType *FTy = cast<FunctionType>(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))); // fixed param.
// Emit type/value pairs for varargs params.
if (FTy->isVarArg()) {
for (unsigned i = FTy->getNumParams(), e = I.getNumOperands()-3;
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::Alloca:
Code = bitc::FUNC_CODE_INST_ALLOCA;
Vals.push_back(VE.getTypeID(I.getType()));
Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
Vals.push_back(Log2_32(cast<AllocaInst>(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<LoadInst>(I).getAlignment())+1);
Vals.push_back(cast<LoadInst>(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<StoreInst>(I).getAlignment())+1);
Vals.push_back(cast<StoreInst>(I).isVolatile());
break;
case Instruction::Call: {
const CallInst &CI = cast<CallInst>(I);
const PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
Code = bitc::FUNC_CODE_INST_CALL2;
Vals.push_back(VE.getAttributeID(CI.getAttributes()));
Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()));
PushValueAndType(CI.getCalledValue(), 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(CI.getArgOperand(i))); // fixed param.
// Emit type/value pairs for varargs params.
if (FTy->isVarArg()) {
for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
i != e; ++i)
PushValueAndType(CI.getArgOperand(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<unsigned, 64> 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<BasicBlock>(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<unsigned, 64> 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);
// If there is function-local metadata, emit it now.
WriteFunctionLocalMetadata(F, VE, Stream);
// Keep a running idea of what the instruction ID is.
unsigned InstID = CstEnd;
bool NeedsMetadataAttachment = false;
DebugLoc LastDL;
// 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()->isVoidTy())
++InstID;
// If the instruction has metadata, write a metadata attachment later.
NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
// If the instruction has a debug location, emit it.
DebugLoc DL = I->getDebugLoc();
if (DL.isUnknown()) {
// nothing todo.
} else if (DL == LastDL) {
// Just repeat the same debug loc as last time.
Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
} else {
MDNode *Scope, *IA;
DL.getScopeAndInlinedAt(Scope, IA, I->getContext());
Vals.push_back(DL.getLine());
Vals.push_back(DL.getCol());
Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0);
Vals.push_back(IA ? VE.getValueID(IA)+1 : 0);
Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC2, Vals);
Vals.clear();
LastDL = DL;
}
}
// Emit names for all the instructions etc.
WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
if (NeedsMetadataAttachment)
WriteMetadataAttachment(F, 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<unsigned, 64> 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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("Unexpected abbrev ordering!");
}
{ // INST_BINOP_FLAGS 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
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
Abbv) != FUNCTION_INST_BINOP_FLAGS_ABBREV)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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)
llvm_unreachable("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<unsigned, 1> 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);
// Emit metadata.
WriteModuleMetadata(M, VE, Stream);
// Emit function bodies.
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I)
if (!I->isDeclaration())
WriteFunction(*I, VE, Stream);
// Emit metadata.
WriteModuleMetadataStore(M, 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
};
/// isARMTriplet - Return true if the triplet looks like:
/// arm-*, thumb-*, armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*.
static bool isARMTriplet(const std::string &TT) {
size_t Pos = 0;
size_t Size = TT.size();
if (Size >= 6 &&
TT[0] == 't' && TT[1] == 'h' && TT[2] == 'u' &&
TT[3] == 'm' && TT[4] == 'b')
Pos = 5;
else if (Size >= 4 && TT[0] == 'a' && TT[1] == 'r' && TT[2] == 'm')
Pos = 3;
else
return false;
if (TT[Pos] == '-')
return true;
else if (TT[Pos] == 'v') {
if (Size >= Pos+4 &&
TT[Pos+1] == '6' && TT[Pos+2] == 't' && TT[Pos+3] == '2')
return true;
else if (Size >= Pos+4 &&
TT[Pos+1] == '5' && TT[Pos+2] == 't' && TT[Pos+3] == 'e')
return true;
} else
return false;
while (++Pos < Size && TT[Pos] != '-') {
if (!isdigit(TT[Pos]))
return false;
}
return true;
}
static void EmitDarwinBCHeader(BitstreamWriter &Stream,
const std::string &TT) {
unsigned CPUType = ~0U;
// Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
// armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. 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_ARM = 12,
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;
else if (isARMTriplet(TT))
CPUType = DARWIN_CPU_TYPE_ARM;
// 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, raw_ostream &Out) {
std::vector<unsigned char> Buffer;
BitstreamWriter Stream(Buffer);
Buffer.reserve(256*1024);
WriteBitcodeToStream( M, Stream );
// Write the generated bitstream to "Out".
Out.write((char*)&Buffer.front(), Buffer.size());
}
/// 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());
}
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