//===--- 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 "ReaderWriter_2_9.h"
#include "legacy_bitcode.h"
#include "ValueEnumerator.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Bitcode/BitstreamWriter.h"
#include "llvm/Bitcode/LLVMBitCodes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/ValueSymbolTable.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
#include <map>
using namespace llvm;
// Redefine older bitcode opcodes for use here. Note that these come from
// LLVM 2.7 (which is what HC shipped with).
#define METADATA_NODE_2_7 2
#define METADATA_FN_NODE_2_7 3
#define METADATA_NAMED_NODE_2_7 5
#define METADATA_ATTACHMENT_2_7 7
#define FUNC_CODE_INST_CALL_2_7 22
#define FUNC_CODE_DEBUG_LOC_2_7 32
// Redefine older bitcode opcodes for use here. Note that these come from
// LLVM 2.7 - 3.0.
#define TYPE_BLOCK_ID_OLD_3_0 10
#define TYPE_SYMTAB_BLOCK_ID_OLD_3_0 13
#define TYPE_CODE_STRUCT_OLD_3_0 10
/// 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, StringRef Str,
unsigned AbbrevToUse, BitstreamWriter &Stream) {
SmallVector<unsigned, 64> Vals;
// Code: [strchar x N]
for (unsigned i = 0, e = Str.size(); i != e; ++i) {
if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i]))
AbbrevToUse = 0;
Vals.push_back(Str[i]);
}
// Emit the finished record.
Stream.EmitRecord(Code, Vals, AbbrevToUse);
}
// Emit information about parameter attributes.
static void WriteAttributeTable(const llvm_2_9::ValueEnumerator &VE,
BitstreamWriter &Stream) {
const std::vector<AttributeSet> &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 AttributeSet &A = Attrs[i];
for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i) {
Record.push_back(A.getSlotIndex(i));
Record.push_back(encodeLLVMAttributesForBitcode(A, A.getSlotIndex(i)));
}
// This needs to use the 3.2 entry type
Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY_OLD, Record);
Record.clear();
}
Stream.ExitBlock();
}
static void WriteTypeSymbolTable(const llvm_2_9::ValueEnumerator &VE,
BitstreamWriter &Stream) {
const llvm_2_9::ValueEnumerator::TypeList &TypeList = VE.getTypes();
Stream.EnterSubblock(TYPE_SYMTAB_BLOCK_ID_OLD_3_0, 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 (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
Type *T = TypeList[i];
switch (T->getTypeID()) {
case Type::StructTyID: {
StructType *ST = cast<StructType>(T);
if (ST->isLiteral()) {
// Skip anonymous struct definitions in type symbol table
// FIXME(srhines)
break;
}
// TST_ENTRY: [typeid, namechar x N]
NameVals.push_back(i);
const std::string &Str = ST->getName();
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();
break;
}
default: break;
}
}
#if 0
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();
}
#endif
Stream.ExitBlock();
}
/// WriteTypeTable - Write out the type table for a module.
static void WriteTypeTable(const llvm_2_9::ValueEnumerator &VE,
BitstreamWriter &Stream) {
const llvm_2_9::ValueEnumerator::TypeList &TypeList = VE.getTypes();
Stream.EnterSubblock(TYPE_BLOCK_ID_OLD_3_0, 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_OLD));
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);
#if 0
// Abbrev for TYPE_CODE_STRUCT_ANON.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON));
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 StructAnonAbbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for TYPE_CODE_STRUCT_NAME.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for TYPE_CODE_STRUCT_NAMED.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED));
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 StructNamedAbbrev = Stream.EmitAbbrev(Abbv);
#endif
// Abbrev for TYPE_CODE_STRUCT.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(TYPE_CODE_STRUCT_OLD_3_0));
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) {
Type *T = TypeList[i];
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::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: {
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: {
FunctionType *FT = cast<FunctionType>(T);
// FUNCTION: [isvararg, attrid, retty, paramty x N]
Code = bitc::TYPE_CODE_FUNCTION_OLD;
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: {
StructType *ST = cast<StructType>(T);
// STRUCT: [ispacked, eltty x N]
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: {
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: {
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();
WriteTypeSymbolTable(VE, Stream);
}
static unsigned getEncodedLinkage(const GlobalValue *GV) {
switch (GV->getLinkage()) {
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::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;
}
llvm_unreachable("Invalid linkage");
}
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 llvm_2_9::ValueEnumerator &VE,
BitstreamWriter &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() != nullptr)
WriteStringRecord(bitc::MODULE_CODE_DATALAYOUT, M->getDataLayout()->getStringRepresentation(),
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,
// unnamed_addr]
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 ||
GV->hasUnnamedAddr()) {
Vals.push_back(getEncodedVisibility(GV));
Vals.push_back(GV->isThreadLocal());
Vals.push_back(GV->hasUnnamedAddr());
} 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, unnamed_addr]
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);
Vals.push_back(F->hasUnnamedAddr());
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 PossiblyExactOperator *PEO =
dyn_cast<PossiblyExactOperator>(V)) {
if (PEO->isExact())
Flags |= 1 << bitc::PEO_EXACT;
}
return Flags;
}
static void WriteMDNode(const MDNode *N,
const llvm_2_9::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() ? METADATA_FN_NODE_2_7 :
METADATA_NODE_2_7;
Stream.EmitRecord(MDCode, Record, 0);
Record.clear();
}
static void WriteModuleMetadata(const Module *M,
const llvm_2_9::ValueEnumerator &VE,
BitstreamWriter &Stream) {
const llvm_2_9::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(METADATA_NAMED_NODE_2_7, Record, 0);
Record.clear();
}
if (StartedMetadataBlock)
Stream.ExitBlock();
}
static void WriteFunctionLocalMetadata(const Function &F,
const llvm_2_9::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 llvm_2_9::ValueEnumerator &VE,
BitstreamWriter &Stream) {
Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
SmallVector<uint64_t, 64> Record;
// Write metadata attachments
// METADATA_ATTACHMENT - [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(METADATA_ATTACHMENT_2_7, 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 llvm_2_9::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 llvm_2_9::ValueEnumerator::ValueList &Vals = VE.getValues();
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;
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<ConstantDataSequential>(C) &&
cast<ConstantDataSequential>(C)->isString()) {
const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
// Emit constant strings specially.
unsigned NumElts = Str->getNumElements();
// If this is a null-terminated string, use the denser CSTRING encoding.
if (Str->isCString()) {
Code = bitc::CST_CODE_CSTRING;
--NumElts; // 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 != NumElts; ++i) {
unsigned char V = Str->getElementAsInteger(i);
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 (const ConstantDataSequential *CDS =
dyn_cast<ConstantDataSequential>(C)) {
// We must replace ConstantDataSequential's representation with the
// legacy ConstantArray/ConstantVector/ConstantStruct version.
// ValueEnumerator is similarly modified to mark the appropriate
// Constants as used (so they are emitted).
Code = bitc::CST_CODE_AGGREGATE;
for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
Record.push_back(VE.getValueID(CDS->getElementAsConstant(i)));
AbbrevToUse = AggregateAbbrev;
} else if (isa<ConstantArray>(C) || isa<ConstantStruct>(C) ||
isa<ConstantVector>(C)) {
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)) {
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 llvm_2_9::ValueEnumerator &VE,
BitstreamWriter &Stream) {
const llvm_2_9::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,
llvm_2_9::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,
llvm_2_9::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;
const 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;
const SwitchInst &SI = cast<SwitchInst>(I);
Vals.push_back(VE.getTypeID(SI.getCondition()->getType()));
Vals.push_back(VE.getValueID(SI.getCondition()));
Vals.push_back(VE.getValueID(SI.getDefaultDest()));
for (SwitchInst::ConstCaseIt i = SI.case_begin(), e = SI.case_end();
i != e; ++i) {
Vals.push_back(VE.getValueID(i.getCaseValue()));
Vals.push_back(VE.getValueID(i.getCaseSuccessor()));
}
}
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());
PointerType *PTy = cast<PointerType>(Callee->getType());
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::Unreachable:
Code = bitc::FUNC_CODE_INST_UNREACHABLE;
AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
break;
case Instruction::PHI: {
const PHINode &PN = cast<PHINode>(I);
Code = bitc::FUNC_CODE_INST_PHI;
Vals.push_back(VE.getTypeID(PN.getType()));
for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
Vals.push_back(VE.getValueID(PN.getIncomingValue(i)));
Vals.push_back(VE.getValueID(PN.getIncomingBlock(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_STORE;
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);
PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
Code = FUNC_CODE_INST_CALL_2_7;
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 llvm_2_9::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, llvm_2_9::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(FUNC_CODE_DEBUG_LOC_2_7, 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();
}
// Emit blockinfo, which defines the standard abbreviations etc.
static void WriteBlockInfo(const llvm_2_9::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.
llvm_2_9::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 F = M->begin(), E = M->end(); F != E; ++F)
if (!F->isDeclaration())
WriteFunction(*F, VE, Stream);
// Emit metadata.
WriteModuleMetadataStore(M, 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 WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
uint32_t &Position) {
Buffer[Position + 0] = (unsigned char) (Value >> 0);
Buffer[Position + 1] = (unsigned char) (Value >> 8);
Buffer[Position + 2] = (unsigned char) (Value >> 16);
Buffer[Position + 3] = (unsigned char) (Value >> 24);
Position += 4;
}
static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
const Triple &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
};
Triple::ArchType Arch = TT.getArch();
if (Arch == Triple::x86_64)
CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
else if (Arch == Triple::x86)
CPUType = DARWIN_CPU_TYPE_X86;
else if (Arch == Triple::ppc)
CPUType = DARWIN_CPU_TYPE_POWERPC;
else if (Arch == Triple::ppc64)
CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
else if (Arch == Triple::arm || Arch == Triple::thumb)
CPUType = DARWIN_CPU_TYPE_ARM;
// Traditional Bitcode starts after header.
assert(Buffer.size() >= DarwinBCHeaderSize &&
"Expected header size to be reserved");
unsigned BCOffset = DarwinBCHeaderSize;
unsigned BCSize = Buffer.size()-DarwinBCHeaderSize;
// Write the magic and version.
unsigned Position = 0;
WriteInt32ToBuffer(0x0B17C0DE , Buffer, Position);
WriteInt32ToBuffer(0 , Buffer, Position); // Version.
WriteInt32ToBuffer(BCOffset , Buffer, Position);
WriteInt32ToBuffer(BCSize , Buffer, Position);
WriteInt32ToBuffer(CPUType , Buffer, Position);
// If the file is not a multiple of 16 bytes, insert dummy padding.
while (Buffer.size() & 15)
Buffer.push_back(0);
}
/// WriteBitcodeToFile - Write the specified module to the specified output
/// stream.
void llvm_2_9::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
SmallVector<char, 1024> Buffer;
Buffer.reserve(256*1024);
// If this is darwin or another generic macho target, reserve space for the
// header.
Triple TT(M->getTargetTriple());
if (TT.isOSDarwin())
Buffer.insert(Buffer.begin(), DarwinBCHeaderSize, 0);
// Emit the module into the buffer.
{
BitstreamWriter Stream(Buffer);
// 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 (TT.isOSDarwin())
EmitDarwinBCHeaderAndTrailer(Buffer, TT);
// Write the generated bitstream to "Out".
Out.write((char*)&Buffer.front(), Buffer.size());
}