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This patch substantially simplifies and cleans up handling of basic blocks

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in the bytecode parser.  Before we tried to shoehorn basic blocks into the
"getValue" code path with other types of values.  For a variety of reasons
this was a bad idea, so this patch separates it out into its own data structure.

This simplifies the code, makes it fit in 80 columns, and is also much faster.
In a testcase provided by Bill, which has lots of PHI nodes, this patch speeds
up bytecode parsing from taking 6.9s to taking 2.32s.  More speedups to
follow later.

llvm-svn: 8977
This commit is contained in:
Chris Lattner 2003-10-08 22:52:54 +00:00
parent c920c81739
commit 55e1c2edfb
3 changed files with 84 additions and 60 deletions
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37
lib/Bytecode/Reader/InstructionReader.cpp
View File

@ -161,12 +161,11 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
delete PN;
return true;
case 2: PN->addIncoming(getValue(Raw->Ty, Raw->Arg1),
cast<BasicBlock>(getValue(Type::LabelTyID,
Raw->Arg2)));
getBasicBlock(Raw->Arg2));
break;
default:
PN->addIncoming(getValue(Raw->Ty, Raw->Arg1),
cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2)));
PN->addIncoming(getValue(Raw->Ty, Raw->Arg1),
getBasicBlock(Raw->Arg2));
if (Raw->VarArgs->size() & 1) {
std::cerr << "PHI Node with ODD number of arguments!\n";
delete PN;
@ -174,8 +173,7 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
} else {
std::vector<unsigned> &args = *Raw->VarArgs;
for (unsigned i = 0; i < args.size(); i+=2)
PN->addIncoming(getValue(Raw->Ty, args[i]),
cast<BasicBlock>(getValue(Type::LabelTyID, args[i+1])));
PN->addIncoming(getValue(Raw->Ty, args[i]), getBasicBlock(args[i+1]));
}
delete Raw->VarArgs;
break;
@ -200,20 +198,18 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
case Instruction::Br:
if (Raw->NumOperands == 1) {
Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTyID,Raw->Arg1)));
Res = new BranchInst(getBasicBlock(Raw->Arg1));
return false;
} else if (Raw->NumOperands == 3) {
Res = new BranchInst(cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg1)),
cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2)),
getValue(Type::BoolTyID , Raw->Arg3));
Res = new BranchInst(getBasicBlock(Raw->Arg1), getBasicBlock(Raw->Arg2),
getValue(Type::BoolTyID , Raw->Arg3));
return false;
}
break;
case Instruction::Switch: {
SwitchInst *I =
new SwitchInst(getValue(Raw->Ty, Raw->Arg1),
cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2)));
new SwitchInst(getValue(Raw->Ty, Raw->Arg1), getBasicBlock(Raw->Arg2));
Res = I;
if (Raw->NumOperands < 3) return false; // No destinations? Weird.
@ -226,7 +222,7 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
std::vector<unsigned> &args = *Raw->VarArgs;
for (unsigned i = 0; i < args.size(); i += 2)
I->addCase(cast<Constant>(getValue(Raw->Ty, args[i])),
cast<BasicBlock>(getValue(Type::LabelTyID, args[i+1])));
getBasicBlock(args[i+1]));
delete Raw->VarArgs;
return false;
@ -311,11 +307,11 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
if (!FTy->isVarArg()) {
if (Raw->NumOperands < 3) return true;
Normal = cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg2));
Normal = getBasicBlock(Raw->Arg2);
if (Raw->NumOperands == 3)
Except = cast<BasicBlock>(getValue(Type::LabelTyID, Raw->Arg3));
Except = getBasicBlock(Raw->Arg3);
else {
Except = cast<BasicBlock>(getValue(Type::LabelTyID, args[0]));
Except = getBasicBlock(args[0]);
FunctionType::ParamTypes::const_iterator It = PL.begin();
for (unsigned i = 1; i < args.size(); i++) {
@ -327,10 +323,11 @@ bool BytecodeParser::ParseInstruction(const unsigned char *&Buf,
}
} else {
if (args.size() < 4) return true;
if (getType(args[0]) != Type::LabelTy ||
getType(args[2]) != Type::LabelTy) return true;
Normal = cast<BasicBlock>(getValue(Type::LabelTyID, args[1]));
Except = cast<BasicBlock>(getValue(Type::LabelTyID, args[3]));
if (args[0] != Type::LabelTyID || args[2] != Type::LabelTyID)
return true;
Normal = getBasicBlock(args[1]);
Except = getBasicBlock(args[3]);
if ((args.size() & 1) != 0)
return true; // Must be pairs of type/value

79
lib/Bytecode/Reader/Reader.cpp
View File

@ -119,6 +119,7 @@ Value *BytecodeParser::getValue(const Type *Ty, unsigned oNum, bool Create) {
Value *BytecodeParser::getValue(unsigned type, unsigned oNum, bool Create) {
assert(type != Type::TypeTyID && "getValue() cannot get types!");
assert(type != Type::LabelTyID && "getValue() cannot get blocks!");
unsigned Num = oNum;
if (HasImplicitZeroInitializer && type >= FirstDerivedTyID) {
@ -138,15 +139,30 @@ Value *BytecodeParser::getValue(unsigned type, unsigned oNum, bool Create) {
if (!Create) return 0; // Do not create a placeholder?
const Type *Ty = getType(type);
Value *Val = type == Type::LabelTyID ? (Value*)new BBPHolder(Ty, oNum) :
(Value*)new ValPHolder(Ty, oNum);
assert(Val != 0 && "How did we not make something?");
Value *Val = new ValPHolder(getType(type), oNum);
if (insertValue(Val, LateResolveValues) == -1) return 0;
return Val;
}
/// getBasicBlock - Get a particular numbered basic block, which might be a
/// forward reference. This works together with ParseBasicBlock to handle these
/// forward references in a clean manner.
///
BasicBlock *BytecodeParser::getBasicBlock(unsigned ID) {
// Make sure there is room in the table...
if (ParsedBasicBlocks.size() <= ID) ParsedBasicBlocks.resize(ID+1);
// First check to see if this is a backwards reference, i.e., ParseBasicBlock
// has already created this block, or if the forward reference has already
// been created.
if (ParsedBasicBlocks[ID])
return ParsedBasicBlocks[ID];
// Otherwise, the basic block has not yet been created. Do so and add it to
// the ParsedBasicBlocks list.
return ParsedBasicBlocks[ID] = new BasicBlock();
}
/// getConstantValue - Just like getValue, except that it returns a null pointer
/// only on error. It always returns a constant (meaning that if the value is
/// defined, but is not a constant, that is an error). If the specified
@ -176,10 +192,16 @@ Constant *BytecodeParser::getConstantValue(const Type *Ty, unsigned Slot) {
}
std::auto_ptr<BasicBlock>
BytecodeParser::ParseBasicBlock(const unsigned char *&Buf,
const unsigned char *EndBuf) {
std::auto_ptr<BasicBlock> BB(new BasicBlock());
BasicBlock *BytecodeParser::ParseBasicBlock(const unsigned char *&Buf,
const unsigned char *EndBuf,
unsigned BlockNo) {
BasicBlock *BB;
if (ParsedBasicBlocks.size() == BlockNo)
ParsedBasicBlocks.push_back(BB = new BasicBlock());
else if (ParsedBasicBlocks[BlockNo] == 0)
BB = ParsedBasicBlocks[BlockNo] = new BasicBlock();
else
BB = ParsedBasicBlocks[BlockNo];
while (Buf < EndBuf) {
Instruction *Inst;
@ -199,7 +221,8 @@ BytecodeParser::ParseBasicBlock(const unsigned char *&Buf,
void BytecodeParser::ParseSymbolTable(const unsigned char *&Buf,
const unsigned char *EndBuf,
SymbolTable *ST) {
SymbolTable *ST,
Function *CurrentFunction) {
while (Buf < EndBuf) {
// Symtab block header: [num entries][type id number]
unsigned NumEntries, Typ;
@ -219,10 +242,17 @@ void BytecodeParser::ParseSymbolTable(const unsigned char *&Buf,
if (read(Buf, EndBuf, Name, false)) // Not aligned...
throw std::string("Buffer not aligned.");
Value *V;
Value *V = 0;
if (Typ == Type::TypeTyID)
V = (Value*)getType(slot);
else
else if (Typ == Type::LabelTyID) {
if (CurrentFunction) {
// FIXME: THIS IS N^2!!!
Function::iterator BlockIterator = CurrentFunction->begin();
std::advance(BlockIterator, slot);
V = BlockIterator;
}
} else
V = getValue(Typ, slot, false); // Find mapping...
if (V == 0) throw std::string("Failed value look-up.");
BCR_TRACE(4, "Map: '" << Name << "' to #" << slot << ":" << *V;
@ -254,9 +284,8 @@ void BytecodeParser::ResolveReferencesToValue(Value *NewV, unsigned Slot) {
GlobalRefs.erase(I); // Remove the map entry for it
}
void
BytecodeParser::ParseFunction(const unsigned char *&Buf,
const unsigned char *EndBuf) {
void BytecodeParser::ParseFunction(const unsigned char *&Buf,
const unsigned char *EndBuf) {
if (FunctionSignatureList.empty())
throw std::string("FunctionSignatureList empty!");
@ -312,6 +341,9 @@ void BytecodeParser::materializeFunction(Function* F) {
throw std::string("Error reading function arguments!");
}
// Keep track of how many basic blocks we have read in...
unsigned BlockNum = 0;
while (Buf < EndBuf) {
unsigned Type, Size;
const unsigned char *OldBuf = Buf;
@ -326,17 +358,14 @@ void BytecodeParser::materializeFunction(Function* F) {
case BytecodeFormat::BasicBlock: {
BCR_TRACE(2, "BLOCK BytecodeFormat::BasicBlock: {\n");
std::auto_ptr<BasicBlock> BB = ParseBasicBlock(Buf, Buf+Size);
if (!BB.get() || insertValue(BB.get(), Values) == -1)
throw std::string("Parse error: BasicBlock");
F->getBasicBlockList().push_back(BB.release());
BasicBlock *BB = ParseBasicBlock(Buf, Buf+Size, BlockNum++);
F->getBasicBlockList().push_back(BB);
break;
}
case BytecodeFormat::SymbolTable: {
BCR_TRACE(2, "BLOCK BytecodeFormat::SymbolTable: {\n");
ParseSymbolTable(Buf, Buf+Size, &F->getSymbolTable());
ParseSymbolTable(Buf, Buf+Size, &F->getSymbolTable(), F);
break;
}
@ -353,6 +382,12 @@ void BytecodeParser::materializeFunction(Function* F) {
ALIGN32(Buf, EndBuf);
}
// Make sure there were no references to non-existant basic blocks.
if (BlockNum != ParsedBasicBlocks.size())
throw std::string("Illegal basic block operand reference");
ParsedBasicBlocks.clear();
// Check for unresolvable references
while (!LateResolveValues.empty()) {
ValueList &VL = *LateResolveValues.back();
@ -582,7 +617,7 @@ void BytecodeParser::ParseModule(const unsigned char *Buf,
case BytecodeFormat::SymbolTable:
BCR_TRACE(1, "BLOCK BytecodeFormat::SymbolTable: {\n");
ParseSymbolTable(Buf, Buf+Size, &TheModule->getSymbolTable());
ParseSymbolTable(Buf, Buf+Size, &TheModule->getSymbolTable(), 0);
break;
default:

28
lib/Bytecode/Reader/ReaderInternals.h
View File

@ -103,6 +103,8 @@ private:
ValueTable Values, LateResolveValues;
ValueTable ModuleValues;
std::vector<BasicBlock*> ParsedBasicBlocks;
// GlobalRefs - This maintains a mapping between <Type, Slot #>'s and forward
// references to global values or constants. Such values may be referenced
// before they are defined, and if so, the temporary object that they
@ -153,15 +155,16 @@ private:
void ParseVersionInfo (const unsigned char *&Buf, const unsigned char *End);
void ParseModuleGlobalInfo(const unsigned char *&Buf, const unsigned char *E);
void ParseSymbolTable(const unsigned char *&Buf, const unsigned char *End,
SymbolTable *);
SymbolTable *, Function *CurrentFunction);
void ParseFunction(const unsigned char *&Buf, const unsigned char *End);
void ParseGlobalTypes(const unsigned char *&Buf, const unsigned char *EndBuf);
std::auto_ptr<BasicBlock>
ParseBasicBlock(const unsigned char *&Buf, const unsigned char *End);
BasicBlock *ParseBasicBlock(const unsigned char *&Buf,
const unsigned char *End,
unsigned BlockNo);
bool ParseInstruction (const unsigned char *&Buf, const unsigned char *End,
Instruction *&);
bool ParseInstruction(const unsigned char *&Buf, const unsigned char *End,
Instruction *&);
std::auto_ptr<RawInst> ParseRawInst(const unsigned char *&Buf,
const unsigned char *End);
@ -179,6 +182,7 @@ private:
Value *getValue(const Type *Ty, unsigned num, bool Create = true);
Value *getValue(unsigned TypeID, unsigned num, bool Create = true);
const Type *getType(unsigned ID);
BasicBlock *getBasicBlock(unsigned ID);
Constant *getConstantValue(const Type *Ty, unsigned num);
int insertValue(Value *V, ValueTable &Table); // -1 = Failure
@ -207,12 +211,6 @@ struct InstPlaceHolderHelper : public Instruction {
virtual Instruction *clone() const { abort(); return 0; }
};
struct BBPlaceHolderHelper : public BasicBlock {
BBPlaceHolderHelper(const Type *Ty) : BasicBlock() {
assert(Ty == Type::LabelTy);
}
};
struct ConstantPlaceHolderHelper : public Constant {
ConstantPlaceHolderHelper(const Type *Ty)
: Constant(Ty) {}
@ -220,7 +218,6 @@ struct ConstantPlaceHolderHelper : public Constant {
};
typedef PlaceholderDef<InstPlaceHolderHelper> ValPHolder;
typedef PlaceholderDef<BBPlaceHolderHelper> BBPHolder;
typedef PlaceholderDef<ConstantPlaceHolderHelper> ConstPHolder;
// Some common errors we find
@ -232,12 +229,7 @@ static const std::string Error_DestSlot = "No destination slot found.";
static inline unsigned getValueIDNumberFromPlaceHolder(Value *Val) {
if (isa<Constant>(Val))
return ((ConstPHolder*)Val)->getID();
// else discriminate by type
switch (Val->getType()->getPrimitiveID()) {
case Type::LabelTyID: return ((BBPHolder*)Val)->getID();
default: return ((ValPHolder*)Val)->getID();
}
return ((ValPHolder*)Val)->getID();
}
static inline void readBlock(const unsigned char *&Buf,