//===-- Writer.cpp - Library for writing LLVM bytecode files --------------===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This library implements the functionality defined in llvm/Bytecode/Writer.h
#include "WriterInternals.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
+#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/SymbolTable.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
-#include "Support/STLExtras.h"
-#include "Support/Statistic.h"
+#include "llvm/Support/Compressor.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Statistic.h"
#include <cstring>
#include <algorithm>
using namespace llvm;
+/// This value needs to be incremented every time the bytecode format changes
+/// so that the reader can distinguish which format of the bytecode file has
+/// been written.
+/// @brief The bytecode version number
+const unsigned BCVersionNum = 5;
+
static RegisterPass<WriteBytecodePass> X("emitbytecode", "Bytecode Writer");
-static Statistic<>
+static Statistic<>
BytesWritten("bytecodewriter", "Number of bytecode bytes written");
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// output - If a position is specified, it must be in the valid portion of the
-// string... note that this should be inlined always so only the relevant IF
+// string... note that this should be inlined always so only the relevant IF
// body should be included.
inline void BytecodeWriter::output(unsigned i, int pos) {
if (pos == -1) { // Be endian clean, little endian is our friend
- Out.push_back((unsigned char)i);
+ Out.push_back((unsigned char)i);
Out.push_back((unsigned char)(i >> 8));
Out.push_back((unsigned char)(i >> 16));
Out.push_back((unsigned char)(i >> 24));
/// output_vbr - Output an unsigned value, by using the least number of bytes
/// possible. This is useful because many of our "infinite" values are really
/// very small most of the time; but can be large a few times.
-/// Data format used: If you read a byte with the high bit set, use the low
-/// seven bits as data and then read another byte. Note that using this may
-/// cause the output buffer to become unaligned.
+/// Data format used: If you read a byte with the high bit set, use the low
+/// seven bits as data and then read another byte.
inline void BytecodeWriter::output_vbr(uint64_t i) {
while (1) {
if (i < 0x80) { // done?
Out.push_back((unsigned char)i); // We know the high bit is clear...
return;
}
-
+
// Nope, we are bigger than a character, output the next 7 bits and set the
// high bit to say that there is more coming...
Out.push_back(0x80 | ((unsigned char)i & 0x7F));
Out.push_back((unsigned char)i); // We know the high bit is clear...
return;
}
-
+
// Nope, we are bigger than a character, output the next 7 bits and set the
// high bit to say that there is more coming...
Out.push_back(0x80 | ((unsigned char)i & 0x7F));
}
inline void BytecodeWriter::output_vbr(int64_t i) {
- if (i < 0)
+ if (i < 0)
output_vbr(((uint64_t)(-i) << 1) | 1); // Set low order sign bit...
else
output_vbr((uint64_t)i << 1); // Low order bit is clear.
inline void BytecodeWriter::output_vbr(int i) {
- if (i < 0)
+ if (i < 0)
output_vbr(((unsigned)(-i) << 1) | 1); // Set low order sign bit...
else
output_vbr((unsigned)i << 1); // Low order bit is clear.
}
-// align32 - emit the minimal number of bytes that will bring us to 32 bit
-// alignment...
-//
-inline void BytecodeWriter::align32() {
- int NumPads = (4-(Out.size() & 3)) & 3; // Bytes to get padding to 32 bits
- while (NumPads--) Out.push_back((unsigned char)0xAB);
-}
-
-inline void BytecodeWriter::output(const std::string &s, bool Aligned ) {
+inline void BytecodeWriter::output(const std::string &s) {
unsigned Len = s.length();
output_vbr(Len ); // Strings may have an arbitrary length...
Out.insert(Out.end(), s.begin(), s.end());
-
- if (Aligned)
- align32(); // Make sure we are now aligned...
}
inline void BytecodeWriter::output_data(const void *Ptr, const void *End) {
}
inline BytecodeBlock::BytecodeBlock(unsigned ID, BytecodeWriter& w,
- bool elideIfEmpty, bool hasLongFormat )
+ bool elideIfEmpty, bool hasLongFormat )
: Id(ID), Writer(w), ElideIfEmpty(elideIfEmpty), HasLongFormat(hasLongFormat){
if (HasLongFormat) {
Loc = w.size();
}
-inline BytecodeBlock::~BytecodeBlock() { // Do backpatch when block goes out
- // of scope...
+inline BytecodeBlock::~BytecodeBlock() { // Do backpatch when block goes out
+ // of scope...
if (Loc == Writer.size() && ElideIfEmpty) {
// If the block is empty, and we are allowed to, do not emit the block at
// all!
return;
}
- //cerr << "OldLoc = " << Loc << " NewLoc = " << NewLoc << " diff = "
- // << (NewLoc-Loc) << endl;
if (HasLongFormat)
Writer.output(unsigned(Writer.size()-Loc), int(Loc-4));
else
Writer.output(unsigned(Writer.size()-Loc) << 5 | (Id & 0x1F), int(Loc-4));
- Writer.align32(); // Blocks must ALWAYS be aligned
}
//===----------------------------------------------------------------------===//
void BytecodeWriter::outputType(const Type *T) {
output_vbr((unsigned)T->getTypeID());
-
+
// That's all there is to handling primitive types...
if (T->isPrimitiveType()) {
return; // We might do this if we alias a prim type: %x = type int
int Slot = Table.getSlot(AT->getElementType());
assert(Slot != -1 && "Type used but not available!!");
output_typeid((unsigned)Slot);
- //std::cerr << "Type slot = " << Slot << " Type = " << T->getName() << endl;
-
output_vbr(AT->getNumElements());
break;
}
+ case Type::PackedTyID: {
+ const PackedType *PT = cast<PackedType>(T);
+ int Slot = Table.getSlot(PT->getElementType());
+ assert(Slot != -1 && "Type used but not available!!");
+ output_typeid((unsigned)Slot);
+ output_vbr(PT->getNumElements());
+ break;
+ }
+
+
case Type::StructTyID: {
const StructType *ST = cast<StructType>(T);
break;
}
- case Type::OpaqueTyID: {
+ case Type::OpaqueTyID:
// No need to emit anything, just the count of opaque types is enough.
break;
- }
- //case Type::PackedTyID:
default:
std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " Type '" << T->getDescription() << "'\n";
// We must check for a ConstantExpr before switching by type because
// a ConstantExpr can be of any type, and has no explicit value.
- //
+ //
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
// FIXME: Encoding of constant exprs could be much more compact!
assert(CE->getNumOperands() > 0 && "ConstantExpr with 0 operands");
- output_vbr(CE->getNumOperands()); // flags as an expr
+ assert(CE->getNumOperands() != 1 || CE->getOpcode() == Instruction::Cast);
+ output_vbr(1+CE->getNumOperands()); // flags as an expr
output_vbr(CE->getOpcode()); // flags as an expr
-
+
for (User::const_op_iterator OI = CE->op_begin(); OI != CE->op_end(); ++OI){
int Slot = Table.getSlot(*OI);
assert(Slot != -1 && "Unknown constant used in ConstantExpr!!");
output_typeid((unsigned)Slot);
}
return;
+ } else if (isa<UndefValue>(CPV)) {
+ output_vbr(1U); // 1 -> UndefValue constant.
+ return;
} else {
output_vbr(0U); // flag as not a ConstantExpr
}
-
+
switch (CPV->getType()->getTypeID()) {
case Type::BoolTyID: // Boolean Types
if (cast<ConstantBool>(CPV)->getValue())
const ConstantArray *CPA = cast<ConstantArray>(CPV);
assert(!CPA->isString() && "Constant strings should be handled specially!");
- for (unsigned i = 0; i != CPA->getNumOperands(); ++i) {
+ for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) {
int Slot = Table.getSlot(CPA->getOperand(i));
assert(Slot != -1 && "Constant used but not available!!");
output_vbr((unsigned)Slot);
break;
}
+ case Type::PackedTyID: {
+ const ConstantPacked *CP = cast<ConstantPacked>(CPV);
+
+ for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) {
+ int Slot = Table.getSlot(CP->getOperand(i));
+ assert(Slot != -1 && "Constant used but not available!!");
+ output_vbr((unsigned)Slot);
+ }
+ break;
+ }
+
case Type::StructTyID: {
const ConstantStruct *CPS = cast<ConstantStruct>(CPV);
- const std::vector<Use> &Vals = CPS->getValues();
- for (unsigned i = 0; i < Vals.size(); ++i) {
- int Slot = Table.getSlot(Vals[i]);
+ for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) {
+ int Slot = Table.getSlot(CPS->getOperand(i));
assert(Slot != -1 && "Constant used but not available!!");
output_vbr((unsigned)Slot);
}
break;
}
- case Type::VoidTyID:
+ case Type::VoidTyID:
case Type::LabelTyID:
default:
std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
// the 'void' type plane.
output_vbr(unsigned(E-I));
output_typeid(Type::VoidTyID);
-
+
// Emit all of the strings.
for (I = Table.string_begin(); I != E; ++I) {
const ConstantArray *Str = *I;
int Slot = Table.getSlot(Str->getType());
assert(Slot != -1 && "Constant string of unknown type?");
output_typeid((unsigned)Slot);
-
+
// Now that we emitted the type (which indicates the size of the string),
// emit all of the characters.
std::string Val = Str->getAsString();
//===----------------------------------------------------------------------===//
typedef unsigned char uchar;
-// outputInstructionFormat0 - Output those wierd instructions that have a large
-// number of operands or have large operands themselves...
+// outputInstructionFormat0 - Output those weird instructions that have a large
+// number of operands or have large operands themselves.
//
// Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
//
-void BytecodeWriter::outputInstructionFormat0(const Instruction *I, unsigned Opcode,
- const SlotCalculator &Table,
- unsigned Type) {
+void BytecodeWriter::outputInstructionFormat0(const Instruction *I,
+ unsigned Opcode,
+ const SlotCalculator &Table,
+ unsigned Type) {
// Opcode must have top two bits clear...
output_vbr(Opcode << 2); // Instruction Opcode ID
output_typeid(Type); // Result type
unsigned NumArgs = I->getNumOperands();
- output_vbr(NumArgs + (isa<CastInst>(I) || isa<VANextInst>(I) ||
- isa<VAArgInst>(I)));
+ output_vbr(NumArgs + (isa<CastInst>(I) ||
+ isa<VAArgInst>(I) || Opcode == 56 || Opcode == 58));
if (!isa<GetElementPtrInst>(&I)) {
for (unsigned i = 0; i < NumArgs; ++i) {
int Slot = Table.getSlot(I->getOperand(i));
- assert(Slot >= 0 && "No slot number for value!?!?");
+ assert(Slot >= 0 && "No slot number for value!?!?");
output_vbr((unsigned)Slot);
}
int Slot = Table.getSlot(I->getType());
assert(Slot != -1 && "Cast return type unknown?");
output_typeid((unsigned)Slot);
- } else if (const VANextInst *VAI = dyn_cast<VANextInst>(I)) {
- int Slot = Table.getSlot(VAI->getArgType());
- assert(Slot != -1 && "VarArg argument type unknown?");
- output_typeid((unsigned)Slot);
+ } else if (Opcode == 56) { // Invoke escape sequence
+ output_vbr(cast<InvokeInst>(I)->getCallingConv());
+ } else if (Opcode == 58) { // Call escape sequence
+ output_vbr((cast<CallInst>(I)->getCallingConv() << 1) |
+ unsigned(cast<CallInst>(I)->isTailCall()));
}
-
} else {
int Slot = Table.getSlot(I->getOperand(0));
- assert(Slot >= 0 && "No slot number for value!?!?");
+ assert(Slot >= 0 && "No slot number for value!?!?");
output_vbr(unsigned(Slot));
// We need to encode the type of sequential type indices into their slot #
for (gep_type_iterator TI = gep_type_begin(I), E = gep_type_end(I);
Idx != NumArgs; ++TI, ++Idx) {
Slot = Table.getSlot(I->getOperand(Idx));
- assert(Slot >= 0 && "No slot number for value!?!?");
-
+ assert(Slot >= 0 && "No slot number for value!?!?");
+
if (isa<SequentialType>(*TI)) {
unsigned IdxId;
switch (I->getOperand(Idx)->getType()->getTypeID()) {
output_vbr(unsigned(Slot));
}
}
-
- align32(); // We must maintain correct alignment!
}
//
// Format: [opcode] [type] [numargs] [arg0] [arg1] ... [arg<numargs-1>]
//
-void BytecodeWriter::outputInstrVarArgsCall(const Instruction *I,
- unsigned Opcode,
- const SlotCalculator &Table,
- unsigned Type) {
+void BytecodeWriter::outputInstrVarArgsCall(const Instruction *I,
+ unsigned Opcode,
+ const SlotCalculator &Table,
+ unsigned Type) {
assert(isa<CallInst>(I) || isa<InvokeInst>(I));
// Opcode must have top two bits clear...
output_vbr(Opcode << 2); // Instruction Opcode ID
// instruction. Just emit the slot # now.
for (unsigned i = 0; i != NumFixedOperands; ++i) {
int Slot = Table.getSlot(I->getOperand(i));
- assert(Slot >= 0 && "No slot number for value!?!?");
+ assert(Slot >= 0 && "No slot number for value!?!?");
output_vbr((unsigned)Slot);
}
for (unsigned i = NumFixedOperands, e = I->getNumOperands(); i != e; ++i) {
// Output Arg Type ID
int Slot = Table.getSlot(I->getOperand(i)->getType());
- assert(Slot >= 0 && "No slot number for value!?!?");
+ assert(Slot >= 0 && "No slot number for value!?!?");
output_typeid((unsigned)Slot);
-
+
// Output arg ID itself
Slot = Table.getSlot(I->getOperand(i));
- assert(Slot >= 0 && "No slot number for value!?!?");
+ assert(Slot >= 0 && "No slot number for value!?!?");
output_vbr((unsigned)Slot);
}
- align32(); // We must maintain correct alignment!
}
// outputInstructionFormat1 - Output one operand instructions, knowing that no
// operand index is >= 2^12.
//
-inline void BytecodeWriter::outputInstructionFormat1(const Instruction *I,
- unsigned Opcode,
- unsigned *Slots,
- unsigned Type) {
+inline void BytecodeWriter::outputInstructionFormat1(const Instruction *I,
+ unsigned Opcode,
+ unsigned *Slots,
+ unsigned Type) {
// bits Instruction format:
// --------------------------
// 01-00: Opcode type, fixed to 1.
// 19-08: Resulting type plane
// 31-20: Operand #1 (if set to (2^12-1), then zero operands)
//
- unsigned Bits = 1 | (Opcode << 2) | (Type << 8) | (Slots[0] << 20);
- // cerr << "1 " << IType << " " << Type << " " << Slots[0] << endl;
- output(Bits);
+ output(1 | (Opcode << 2) | (Type << 8) | (Slots[0] << 20));
}
// outputInstructionFormat2 - Output two operand instructions, knowing that no
// operand index is >= 2^8.
//
-inline void BytecodeWriter::outputInstructionFormat2(const Instruction *I,
- unsigned Opcode,
- unsigned *Slots,
- unsigned Type) {
+inline void BytecodeWriter::outputInstructionFormat2(const Instruction *I,
+ unsigned Opcode,
+ unsigned *Slots,
+ unsigned Type) {
// bits Instruction format:
// --------------------------
// 01-00: Opcode type, fixed to 2.
// 07-02: Opcode
// 15-08: Resulting type plane
// 23-16: Operand #1
- // 31-24: Operand #2
+ // 31-24: Operand #2
//
- unsigned Bits = 2 | (Opcode << 2) | (Type << 8) |
- (Slots[0] << 16) | (Slots[1] << 24);
- // cerr << "2 " << IType << " " << Type << " " << Slots[0] << " "
- // << Slots[1] << endl;
- output(Bits);
+ output(2 | (Opcode << 2) | (Type << 8) | (Slots[0] << 16) | (Slots[1] << 24));
}
// outputInstructionFormat3 - Output three operand instructions, knowing that no
// operand index is >= 2^6.
//
-inline void BytecodeWriter::outputInstructionFormat3(const Instruction *I,
+inline void BytecodeWriter::outputInstructionFormat3(const Instruction *I,
unsigned Opcode,
- unsigned *Slots,
- unsigned Type) {
+ unsigned *Slots,
+ unsigned Type) {
// bits Instruction format:
// --------------------------
// 01-00: Opcode type, fixed to 3.
// 25-20: Operand #2
// 31-26: Operand #3
//
- unsigned Bits = 3 | (Opcode << 2) | (Type << 8) |
- (Slots[0] << 14) | (Slots[1] << 20) | (Slots[2] << 26);
- //cerr << "3 " << IType << " " << Type << " " << Slots[0] << " "
- // << Slots[1] << " " << Slots[2] << endl;
- output(Bits);
+ output(3 | (Opcode << 2) | (Type << 8) |
+ (Slots[0] << 14) | (Slots[1] << 20) | (Slots[2] << 26));
}
void BytecodeWriter::outputInstruction(const Instruction &I) {
- assert(I.getOpcode() < 62 && "Opcode too big???");
+ assert(I.getOpcode() < 56 && "Opcode too big???");
unsigned Opcode = I.getOpcode();
unsigned NumOperands = I.getNumOperands();
- // Encode 'volatile load' as 62 and 'volatile store' as 63.
- if (isa<LoadInst>(I) && cast<LoadInst>(I).isVolatile())
+ // Encode 'tail call' as 61, 'volatile load' as 62, and 'volatile store' as
+ // 63.
+ if (const CallInst *CI = dyn_cast<CallInst>(&I)) {
+ if (CI->getCallingConv() == CallingConv::C) {
+ if (CI->isTailCall())
+ Opcode = 61; // CCC + Tail Call
+ else
+ ; // Opcode = Instruction::Call
+ } else if (CI->getCallingConv() == CallingConv::Fast) {
+ if (CI->isTailCall())
+ Opcode = 59; // FastCC + TailCall
+ else
+ Opcode = 60; // FastCC + Not Tail Call
+ } else {
+ Opcode = 58; // Call escape sequence.
+ }
+ } else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I)) {
+ if (II->getCallingConv() == CallingConv::Fast)
+ Opcode = 57; // FastCC invoke.
+ else if (II->getCallingConv() != CallingConv::C)
+ Opcode = 56; // Invoke escape sequence.
+
+ } else if (isa<LoadInst>(I) && cast<LoadInst>(I).isVolatile()) {
Opcode = 62;
- if (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile())
+ } else if (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile()) {
Opcode = 63;
+ }
// Figure out which type to encode with the instruction. Typically we want
// the type of the first parameter, as opposed to the type of the instruction
// (for example, with setcc, we always know it returns bool, but the type of
// the first param is actually interesting). But if we have no arguments
- // we take the type of the instruction itself.
+ // we take the type of the instruction itself.
//
const Type *Ty;
switch (I.getOpcode()) {
//
unsigned MaxOpSlot = Type;
unsigned Slots[3]; Slots[0] = (1 << 12)-1; // Marker to signify 0 operands
-
+
for (unsigned i = 0; i != NumOperands; ++i) {
int slot = Table.getSlot(I.getOperand(i));
assert(slot != -1 && "Broken bytecode!");
assert(Slots[1] != ~0U && "Cast return type unknown?");
if (Slots[1] > MaxOpSlot) MaxOpSlot = Slots[1];
NumOperands++;
- } else if (const VANextInst *VANI = dyn_cast<VANextInst>(&I)) {
- Slots[1] = Table.getSlot(VANI->getArgType());
- assert(Slots[1] != ~0U && "va_next return type unknown?");
- if (Slots[1] > MaxOpSlot) MaxOpSlot = Slots[1];
- NumOperands++;
} else if (const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&I)) {
// We need to encode the type of sequential type indices into their slot #
unsigned Idx = 1;
Slots[Idx] = (Slots[Idx] << 2) | IdxId;
if (Slots[Idx] > MaxOpSlot) MaxOpSlot = Slots[Idx];
}
+ } else if (Opcode == 58) {
+ // If this is the escape sequence for call, emit the tailcall/cc info.
+ const CallInst &CI = cast<CallInst>(I);
+ ++NumOperands;
+ if (NumOperands < 3) {
+ Slots[NumOperands-1] = (CI.getCallingConv() << 1)|unsigned(CI.isTailCall());
+ if (Slots[NumOperands-1] > MaxOpSlot)
+ MaxOpSlot = Slots[NumOperands-1];
+ }
+ } else if (Opcode == 56) {
+ // Invoke escape seq has at least 4 operands to encode.
+ ++NumOperands;
}
// Decide which instruction encoding to use. This is determined primarily
//=== Block Output ===//
//===----------------------------------------------------------------------===//
-BytecodeWriter::BytecodeWriter(std::vector<unsigned char> &o, const Module *M)
+BytecodeWriter::BytecodeWriter(std::vector<unsigned char> &o, const Module *M)
: Out(o), Table(M) {
// Emit the signature...
bool hasNoEndianness = M->getEndianness() == Module::AnyEndianness;
bool hasNoPointerSize = M->getPointerSize() == Module::AnyPointerSize;
- // Output the version identifier... we are currently on bytecode version #2,
- // which corresponds to LLVM v1.3.
- unsigned Version = (3 << 4) | (unsigned)isBigEndian | (hasLongPointers << 1) |
- (hasNoEndianness << 2) | (hasNoPointerSize << 3);
+ // Output the version identifier and other information.
+ unsigned Version = (BCVersionNum << 4) |
+ (unsigned)isBigEndian | (hasLongPointers << 1) |
+ (hasNoEndianness << 2) |
+ (hasNoPointerSize << 3);
output_vbr(Version);
- align32();
// The Global type plane comes first
{
outputSymbolTable(M->getSymbolTable());
}
-void BytecodeWriter::outputTypes(unsigned TypeNum)
-{
+void BytecodeWriter::outputTypes(unsigned TypeNum) {
// Write the type plane for types first because earlier planes (e.g. for a
// primitive type like float) may have constants constructed using types
// coming later (e.g., via getelementptr from a pointer type). The type
assert(TypeNum <= Types.size() && "Invalid TypeNo index");
unsigned NumEntries = Types.size() - TypeNum;
-
+
// Output type header: [num entries]
output_vbr(NumEntries);
// Helper function for outputConstants().
// Writes out all the constants in the plane Plane starting at entry StartNo.
-//
+//
void BytecodeWriter::outputConstantsInPlane(const std::vector<const Value*>
&Plane, unsigned StartNo) {
unsigned ValNo = StartNo;
-
+
// Scan through and ignore function arguments, global values, and constant
// strings.
for (; ValNo < Plane.size() &&
}
}
-static inline bool hasNullValue(unsigned TyID) {
- return TyID != Type::LabelTyID && TyID != Type::VoidTyID;
+static inline bool hasNullValue(const Type *Ty) {
+ return Ty != Type::LabelTy && Ty != Type::VoidTy && !isa<OpaqueType>(Ty);
}
void BytecodeWriter::outputConstants(bool isFunction) {
if (isFunction)
// Output the type plane before any constants!
- outputTypes( Table.getModuleTypeLevel() );
+ outputTypes(Table.getModuleTypeLevel());
else
- // Output module-level string constants before any other constants.x
+ // Output module-level string constants before any other constants.
outputConstantStrings();
for (unsigned pno = 0; pno != NumPlanes; pno++) {
unsigned ValNo = 0;
if (isFunction) // Don't re-emit module constants
ValNo += Table.getModuleLevel(pno);
-
- if (hasNullValue(pno)) {
+
+ if (hasNullValue(Plane[0]->getType())) {
// Skip zero initializer
if (ValNo == 0)
ValNo = 1;
}
-
+
// Write out constants in the plane
outputConstantsInPlane(Plane, ValNo);
}
void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
BytecodeBlock ModuleInfoBlock(BytecodeFormat::ModuleGlobalInfoBlockID, *this);
-
+
// Output the types for the global variables in the module...
- for (Module::const_giterator I = M->gbegin(), End = M->gend(); I != End;++I) {
+ for (Module::const_global_iterator I = M->global_begin(),
+ End = M->global_end(); I != End;++I) {
int Slot = Table.getSlot(I->getType());
assert(Slot != -1 && "Module global vars is broken!");
// bit5+ = Slot # for type
unsigned oSlot = ((unsigned)Slot << 5) | (getEncodedLinkage(I) << 2) |
(I->hasInitializer() << 1) | (unsigned)I->isConstant();
- output_vbr(oSlot );
+ output_vbr(oSlot);
// If we have an initializer, output it now.
if (I->hasInitializer()) {
}
output_typeid((unsigned)Table.getSlot(Type::VoidTy));
- // Output the types of the functions in this module...
+ // Output the types of the functions in this module.
for (Module::const_iterator I = M->begin(), End = M->end(); I != End; ++I) {
int Slot = Table.getSlot(I->getType());
- assert(Slot != -1 && "Module const pool is broken!");
+ assert(Slot != -1 && "Module slot calculator is broken!");
assert(Slot >= Type::FirstDerivedTyID && "Derived type not in range!");
- output_typeid((unsigned)Slot);
+ assert(((Slot << 5) >> 5) == Slot && "Slot # too big!");
+ unsigned ID = (Slot << 5);
+
+ if (I->getCallingConv() < 15)
+ ID += I->getCallingConv()+1;
+
+ if (I->isExternal()) // If external, we don't have an FunctionInfo block.
+ ID |= 1 << 4;
+ output_vbr(ID);
+
+ if (I->getCallingConv() >= 15)
+ output_vbr(I->getCallingConv());
}
- output_typeid((unsigned)Table.getSlot(Type::VoidTy));
+ output_vbr((unsigned)Table.getSlot(Type::VoidTy) << 5);
- // Put out the list of dependent libraries for the Module
+ // Emit the list of dependent libraries for the Module.
Module::lib_iterator LI = M->lib_begin();
Module::lib_iterator LE = M->lib_end();
- output_vbr( unsigned(LE - LI) ); // Put out the number of dependent libraries
- for ( ; LI != LE; ++LI ) {
- output(*LI, /*aligned=*/false);
- }
+ output_vbr(unsigned(LE - LI)); // Emit the number of dependent libraries.
+ for (; LI != LE; ++LI)
+ output(*LI);
// Output the target triple from the module
- output(M->getTargetTriple(), /*aligned=*/ true);
+ output(M->getTargetTriple());
}
void BytecodeWriter::outputInstructions(const Function *F) {
}
void BytecodeWriter::outputFunction(const Function *F) {
- BytecodeBlock FunctionBlock(BytecodeFormat::FunctionBlockID, *this);
- output_vbr(getEncodedLinkage(F));
-
// If this is an external function, there is nothing else to emit!
if (F->isExternal()) return;
+ BytecodeBlock FunctionBlock(BytecodeFormat::FunctionBlockID, *this);
+ output_vbr(getEncodedLinkage(F));
+
// Get slot information about the function...
Table.incorporateFunction(F);
// Otherwise, emit the compaction table.
outputCompactionTable();
}
-
+
// Output all of the instructions in the body of the function
outputInstructions(F);
-
+
// If needed, output the symbol table for the function...
outputSymbolTable(F->getSymbolTable());
-
+
Table.purgeFunction();
}
}
void BytecodeWriter::outputCompactionTable() {
- BytecodeBlock CTB(BytecodeFormat::CompactionTableBlockID, *this,
- true/*ElideIfEmpty*/);
- const std::vector<std::vector<const Value*> > &CT =Table.getCompactionTable();
-
- // First thing is first, emit the type compaction table if there is one.
- outputCompactionTypes(Type::FirstDerivedTyID);
-
- for (unsigned i = 0, e = CT.size(); i != e; ++i)
- outputCompactionTablePlane(i, CT[i], 0);
+ // Avoid writing the compaction table at all if there is no content.
+ if (Table.getCompactionTypes().size() >= Type::FirstDerivedTyID ||
+ (!Table.CompactionTableIsEmpty())) {
+ BytecodeBlock CTB(BytecodeFormat::CompactionTableBlockID, *this,
+ true/*ElideIfEmpty*/);
+ const std::vector<std::vector<const Value*> > &CT =
+ Table.getCompactionTable();
+
+ // First things first, emit the type compaction table if there is one.
+ outputCompactionTypes(Type::FirstDerivedTyID);
+
+ for (unsigned i = 0, e = CT.size(); i != e; ++i)
+ outputCompactionTablePlane(i, CT[i], 0);
+ }
}
void BytecodeWriter::outputSymbolTable(const SymbolTable &MST) {
// Do not output the Bytecode block for an empty symbol table, it just wastes
// space!
- if ( MST.isEmpty() ) return;
+ if (MST.isEmpty()) return;
BytecodeBlock SymTabBlock(BytecodeFormat::SymbolTableBlockID, *this,
- true/* ElideIfEmpty*/);
+ true/*ElideIfEmpty*/);
- //Symtab block header for types: [num entries]
+ // Write the number of types
output_vbr(MST.num_types());
+
+ // Write each of the types
for (SymbolTable::type_const_iterator TI = MST.type_begin(),
TE = MST.type_end(); TI != TE; ++TI ) {
- //Symtab entry:[def slot #][name]
+ // Symtab entry:[def slot #][name]
output_typeid((unsigned)Table.getSlot(TI->second));
- output(TI->first, /*align=*/false);
+ output(TI->first);
}
// Now do each of the type planes in order.
- for (SymbolTable::plane_const_iterator PI = MST.plane_begin(),
+ for (SymbolTable::plane_const_iterator PI = MST.plane_begin(),
PE = MST.plane_end(); PI != PE; ++PI) {
SymbolTable::value_const_iterator I = MST.value_begin(PI->first);
SymbolTable::value_const_iterator End = MST.value_end(PI->first);
int Slot;
-
+
if (I == End) continue; // Don't mess with an absent type...
- // Symtab block header: [num entries][type id number]
- output_vbr(MST.type_size(PI->first));
+ // Write the number of values in this plane
+ output_vbr((unsigned)PI->second.size());
+ // Write the slot number of the type for this plane
Slot = Table.getSlot(PI->first);
assert(Slot != -1 && "Type in symtab, but not in table!");
output_typeid((unsigned)Slot);
+ // Write each of the values in this plane
for (; I != End; ++I) {
// Symtab entry: [def slot #][name]
Slot = Table.getSlot(I->second);
assert(Slot != -1 && "Value in symtab but has no slot number!!");
output_vbr((unsigned)Slot);
- output(I->first, false); // Don't force alignment...
+ output(I->first);
}
}
}
-void llvm::WriteBytecodeToFile(const Module *M, std::ostream &Out) {
+void llvm::WriteBytecodeToFile(const Module *M, std::ostream &Out,
+ bool compress ) {
assert(M && "You can't write a null module!!");
+ // Create a vector of unsigned char for the bytecode output. We
+ // reserve 256KBytes of space in the vector so that we avoid doing
+ // lots of little allocations. 256KBytes is sufficient for a large
+ // proportion of the bytecode files we will encounter. Larger files
+ // will be automatically doubled in size as needed (std::vector
+ // behavior).
std::vector<unsigned char> Buffer;
- Buffer.reserve(64 * 1024); // avoid lots of little reallocs
+ Buffer.reserve(256 * 1024);
- // This object populates buffer for us...
+ // The BytecodeWriter populates Buffer for us.
BytecodeWriter BCW(Buffer, M);
- // Keep track of how much we've written...
+ // Keep track of how much we've written
BytesWritten += Buffer.size();
- // Okay, write the deque out to the ostream now... the deque is not
- // sequential in memory, however, so write out as much as possible in big
- // chunks, until we're done.
- //
+ // Determine start and end points of the Buffer
+ const unsigned char *FirstByte = &Buffer.front();
- std::vector<unsigned char>::const_iterator I = Buffer.begin(),E = Buffer.end();
- while (I != E) { // Loop until it's all written
- // Scan to see how big this chunk is...
- const unsigned char *ChunkPtr = &*I;
- const unsigned char *LastPtr = ChunkPtr;
- while (I != E) {
- const unsigned char *ThisPtr = &*++I;
- if (++LastPtr != ThisPtr) // Advanced by more than a byte of memory?
- break;
- }
-
- // Write out the chunk...
- Out.write((char*)ChunkPtr, unsigned(LastPtr-ChunkPtr));
+ // If we're supposed to compress this mess ...
+ if (compress) {
+
+ // We signal compression by using an alternate magic number for the
+ // file. The compressed bytecode file's magic number is "llvc" instead
+ // of "llvm".
+ char compressed_magic[4];
+ compressed_magic[0] = 'l';
+ compressed_magic[1] = 'l';
+ compressed_magic[2] = 'v';
+ compressed_magic[3] = 'c';
+
+ Out.write(compressed_magic,4);
+
+ // Compress everything after the magic number (which we altered)
+ uint64_t zipSize = Compressor::compressToStream(
+ (char*)(FirstByte+4), // Skip the magic number
+ Buffer.size()-4, // Skip the magic number
+ Out // Where to write compressed data
+ );
+
+ } else {
+
+ // We're not compressing, so just write the entire block.
+ Out.write((char*)FirstByte, Buffer.size());
}
+
+ // make sure it hits disk now
Out.flush();
}
-// vim: sw=2 ai
projects / oota-llvm.git / blobdiff