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-rw-r--r--lib/Bitcode/Writer/BitcodeWriter.cpp318
1 files changed, 228 insertions, 90 deletions
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 5b3d96953a0e..b25d2e96d594 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -23,6 +23,7 @@
#include "llvm/Operator.h"
#include "llvm/ValueSymbolTable.h"
#include "llvm/ADT/Triple.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
@@ -31,6 +32,12 @@
#include <map>
using namespace llvm;
+static cl::opt<bool>
+EnablePreserveUseListOrdering("enable-bc-uselist-preserve",
+ cl::desc("Turn on experimental support for "
+ "use-list order preservation."),
+ cl::init(false), cl::Hidden);
+
/// 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 {
@@ -119,7 +126,6 @@ static unsigned GetEncodedRMWOperation(AtomicRMWInst::BinOp Op) {
static unsigned GetEncodedOrdering(AtomicOrdering Ordering) {
switch (Ordering) {
- default: llvm_unreachable("Unknown atomic ordering");
case NotAtomic: return bitc::ORDERING_NOTATOMIC;
case Unordered: return bitc::ORDERING_UNORDERED;
case Monotonic: return bitc::ORDERING_MONOTONIC;
@@ -128,14 +134,15 @@ static unsigned GetEncodedOrdering(AtomicOrdering Ordering) {
case AcquireRelease: return bitc::ORDERING_ACQREL;
case SequentiallyConsistent: return bitc::ORDERING_SEQCST;
}
+ llvm_unreachable("Invalid ordering");
}
static unsigned GetEncodedSynchScope(SynchronizationScope SynchScope) {
switch (SynchScope) {
- default: llvm_unreachable("Unknown synchronization scope");
case SingleThread: return bitc::SYNCHSCOPE_SINGLETHREAD;
case CrossThread: return bitc::SYNCHSCOPE_CROSSTHREAD;
}
+ llvm_unreachable("Invalid synch scope");
}
static void WriteStringRecord(unsigned Code, StringRef Str,
@@ -172,10 +179,11 @@ static void WriteAttributeTable(const ValueEnumerator &VE,
// 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;
+ uint64_t FauxAttr = PAWI.Attrs.Raw() & 0xffff;
if (PAWI.Attrs & Attribute::Alignment)
- FauxAttr |= (1ull<<16)<<(((PAWI.Attrs & Attribute::Alignment)-1) >> 16);
- FauxAttr |= (PAWI.Attrs & (0x3FFull << 21)) << 11;
+ FauxAttr |= (1ull<<16)<<
+ (((PAWI.Attrs & Attribute::Alignment).Raw()-1) >> 16);
+ FauxAttr |= (PAWI.Attrs.Raw() & (0x3FFull << 21)) << 11;
Record.push_back(FauxAttr);
}
@@ -194,11 +202,12 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
SmallVector<uint64_t, 64> TypeVals;
+ uint64_t NumBits = Log2_32_Ceil(VE.getTypes().size()+1);
+
// 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(BitCodeAbbrevOp::Fixed, NumBits));
Abbv->Add(BitCodeAbbrevOp(0)); // Addrspace = 0
unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
@@ -206,10 +215,9 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
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)));
+ Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
+
unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for TYPE_CODE_STRUCT_ANON.
@@ -217,8 +225,8 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
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)));
+ Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
+
unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for TYPE_CODE_STRUCT_NAME.
@@ -233,16 +241,16 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
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)));
+ Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
+
unsigned StructNamedAbbrev = 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)));
+ Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
+
unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
// Emit an entry count so the reader can reserve space.
@@ -259,6 +267,7 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
switch (T->getTypeID()) {
default: llvm_unreachable("Unknown type!");
case Type::VoidTyID: Code = bitc::TYPE_CODE_VOID; break;
+ case Type::HalfTyID: Code = bitc::TYPE_CODE_HALF; 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;
@@ -284,10 +293,9 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
}
case Type::FunctionTyID: {
FunctionType *FT = cast<FunctionType>(T);
- // FUNCTION: [isvararg, attrid, retty, paramty x N]
+ // FUNCTION: [isvararg, 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)));
@@ -350,7 +358,6 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
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;
@@ -368,15 +375,16 @@ static unsigned getEncodedLinkage(const GlobalValue *GV) {
case GlobalValue::LinkerPrivateWeakLinkage: return 14;
case GlobalValue::LinkerPrivateWeakDefAutoLinkage: return 15;
}
+ 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;
}
+ llvm_unreachable("Invalid visibility");
}
// Emit top-level description of module, including target triple, inline asm,
@@ -499,8 +507,8 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
// 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]
+ // FUNCTION: [type, callingconv, isproto, linkage, paramattrs, alignment,
+ // section, visibility, gc, unnamed_addr]
Vals.push_back(VE.getTypeID(F->getType()));
Vals.push_back(F->getCallingConv());
Vals.push_back(F->isDeclaration());
@@ -520,6 +528,7 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
// Emit the alias information.
for (Module::const_alias_iterator AI = M->alias_begin(), E = M->alias_end();
AI != E; ++AI) {
+ // ALIAS: [alias type, aliasee val#, linkage, visibility]
Vals.push_back(VE.getTypeID(AI->getType()));
Vals.push_back(VE.getValueID(AI->getAliasee()));
Vals.push_back(getEncodedLinkage(AI));
@@ -819,7 +828,7 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
Code = bitc::CST_CODE_FLOAT;
Type *Ty = CFP->getType();
- if (Ty->isFloatTy() || Ty->isDoubleTy()) {
+ if (Ty->isHalfTy() || Ty->isFloatTy() || Ty->isDoubleTy()) {
Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
} else if (Ty->isX86_FP80Ty()) {
// api needed to prevent premature destruction
@@ -836,34 +845,56 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
} else {
assert (0 && "Unknown FP type!");
}
- } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) {
- const ConstantArray *CA = cast<ConstantArray>(C);
+ } else if (isa<ConstantDataSequential>(C) &&
+ cast<ConstantDataSequential>(C)->isString()) {
+ const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
// Emit constant strings specially.
- unsigned NumOps = CA->getNumOperands();
+ unsigned NumElts = Str->getNumElements();
// If this is a null-terminated string, use the denser CSTRING encoding.
- if (CA->getOperand(NumOps-1)->isNullValue()) {
+ if (Str->isCString()) {
Code = bitc::CST_CODE_CSTRING;
- --NumOps; // Don't encode the null, which isn't allowed by char6.
+ --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 != NumOps; ++i) {
- unsigned char V = cast<ConstantInt>(CA->getOperand(i))->getZExtValue();
+ 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 (isa<ConstantArray>(C) || isa<ConstantStruct>(V) ||
- isa<ConstantVector>(V)) {
+ } else if (const ConstantDataSequential *CDS =
+ dyn_cast<ConstantDataSequential>(C)) {
+ Code = bitc::CST_CODE_DATA;
+ Type *EltTy = CDS->getType()->getElementType();
+ if (isa<IntegerType>(EltTy)) {
+ for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
+ Record.push_back(CDS->getElementAsInteger(i));
+ } else if (EltTy->isFloatTy()) {
+ for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
+ union { float F; uint32_t I; };
+ F = CDS->getElementAsFloat(i);
+ Record.push_back(I);
+ }
+ } else {
+ assert(EltTy->isDoubleTy() && "Unknown ConstantData element type");
+ for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
+ union { double F; uint64_t I; };
+ F = CDS->getElementAsDouble(i);
+ Record.push_back(I);
+ }
+ }
+ } 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)));
@@ -1105,10 +1136,18 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
}
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)));
+ {
+ Code = bitc::FUNC_CODE_INST_SWITCH;
+ 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::CaseIt 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;
@@ -1146,9 +1185,6 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
Code = bitc::FUNC_CODE_INST_RESUME;
PushValueAndType(I.getOperand(0), InstID, Vals, VE);
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;
@@ -1573,6 +1609,102 @@ static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
Stream.ExitBlock();
}
+// Sort the Users based on the order in which the reader parses the bitcode
+// file.
+static bool bitcodereader_order(const User *lhs, const User *rhs) {
+ // TODO: Implement.
+ return true;
+}
+
+static void WriteUseList(const Value *V, const ValueEnumerator &VE,
+ BitstreamWriter &Stream) {
+
+ // One or zero uses can't get out of order.
+ if (V->use_empty() || V->hasNUses(1))
+ return;
+
+ // Make a copy of the in-memory use-list for sorting.
+ unsigned UseListSize = std::distance(V->use_begin(), V->use_end());
+ SmallVector<const User*, 8> UseList;
+ UseList.reserve(UseListSize);
+ for (Value::const_use_iterator I = V->use_begin(), E = V->use_end();
+ I != E; ++I) {
+ const User *U = *I;
+ UseList.push_back(U);
+ }
+
+ // Sort the copy based on the order read by the BitcodeReader.
+ std::sort(UseList.begin(), UseList.end(), bitcodereader_order);
+
+ // TODO: Generate a diff between the BitcodeWriter in-memory use-list and the
+ // sorted list (i.e., the expected BitcodeReader in-memory use-list).
+
+ // TODO: Emit the USELIST_CODE_ENTRYs.
+}
+
+static void WriteFunctionUseList(const Function *F, ValueEnumerator &VE,
+ BitstreamWriter &Stream) {
+ VE.incorporateFunction(*F);
+
+ for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
+ AI != AE; ++AI)
+ WriteUseList(AI, VE, Stream);
+ for (Function::const_iterator BB = F->begin(), FE = F->end(); BB != FE;
+ ++BB) {
+ WriteUseList(BB, VE, Stream);
+ for (BasicBlock::const_iterator II = BB->begin(), IE = BB->end(); II != IE;
+ ++II) {
+ WriteUseList(II, VE, Stream);
+ for (User::const_op_iterator OI = II->op_begin(), E = II->op_end();
+ OI != E; ++OI) {
+ if ((isa<Constant>(*OI) && !isa<GlobalValue>(*OI)) ||
+ isa<InlineAsm>(*OI))
+ WriteUseList(*OI, VE, Stream);
+ }
+ }
+ }
+ VE.purgeFunction();
+}
+
+// Emit use-lists.
+static void WriteModuleUseLists(const Module *M, ValueEnumerator &VE,
+ BitstreamWriter &Stream) {
+ Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
+
+ // XXX: this modifies the module, but in a way that should never change the
+ // behavior of any pass or codegen in LLVM. The problem is that GVs may
+ // contain entries in the use_list that do not exist in the Module and are
+ // not stored in the .bc file.
+ for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
+ I != E; ++I)
+ I->removeDeadConstantUsers();
+
+ // Write the global variables.
+ for (Module::const_global_iterator GI = M->global_begin(),
+ GE = M->global_end(); GI != GE; ++GI) {
+ WriteUseList(GI, VE, Stream);
+
+ // Write the global variable initializers.
+ if (GI->hasInitializer())
+ WriteUseList(GI->getInitializer(), VE, Stream);
+ }
+
+ // Write the functions.
+ for (Module::const_iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
+ WriteUseList(FI, VE, Stream);
+ if (!FI->isDeclaration())
+ WriteFunctionUseList(FI, VE, Stream);
+ }
+
+ // Write the aliases.
+ for (Module::const_alias_iterator AI = M->alias_begin(), AE = M->alias_end();
+ AI != AE; ++AI) {
+ WriteUseList(AI, VE, Stream);
+ WriteUseList(AI->getAliasee(), VE, Stream);
+ }
+
+ Stream.ExitBlock();
+}
/// WriteModule - Emit the specified module to the bitstream.
static void WriteModule(const Module *M, BitstreamWriter &Stream) {
@@ -1607,17 +1739,21 @@ static void WriteModule(const Module *M, BitstreamWriter &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);
+ // Emit use-lists.
+ if (EnablePreserveUseListOrdering)
+ WriteModuleUseLists(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);
+
Stream.ExitBlock();
}
@@ -1639,7 +1775,17 @@ enum {
DarwinBCHeaderSize = 5*4
};
-static void EmitDarwinBCHeader(BitstreamWriter &Stream, const Triple &TT) {
+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-*,
@@ -1666,63 +1812,55 @@ static void EmitDarwinBCHeader(BitstreamWriter &Stream, const Triple &TT) {
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;
- 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);
+ // 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 (BufferSize & 15) {
- Stream.Emit(0, 8);
- ++BufferSize;
- }
+ while (Buffer.size() & 15)
+ Buffer.push_back(0);
}
-
/// 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);
-
+ SmallVector<char, 1024> 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 or another generic macho target, emit a file header and
- // trailer if needed.
+ // If this is darwin or another generic macho target, reserve space for the
+ // header.
Triple TT(M->getTargetTriple());
if (TT.isOSDarwin())
- EmitDarwinBCHeader(Stream, TT);
-
- // 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);
+ 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())
- EmitDarwinBCTrailer(Stream, Stream.getBuffer().size());
+ EmitDarwinBCHeaderAndTrailer(Buffer, TT);
+
+ // Write the generated bitstream to "Out".
+ Out.write((char*)&Buffer.front(), Buffer.size());
}
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