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avoid creating a temporary string when reading the symbol table for a

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module.  This speeds up the bcreader 11%.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-02-12 18:53:43 +00:00
parent 042ad36871
commit dd8cec59fc
4 changed files with 27 additions and 10 deletions
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30
lib/Bytecode/Reader/Reader.cpp
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@ -132,6 +132,17 @@ inline std::string BytecodeReader::read_str() {
return std::string((char*)OldAt, Size);
}
void BytecodeReader::read_str(SmallVectorImpl<char> &StrData) {
StrData.clear();
unsigned Size = read_vbr_uint();
const unsigned char *OldAt = At;
At += Size;
if (At > BlockEnd) // Size invalid?
error("Ran out of data reading a string!");
StrData.append(OldAt, At);
}
/// Read an arbitrary block of data
inline void BytecodeReader::read_data(void *Ptr, void *End) {
unsigned char *Start = (unsigned char *)Ptr;
@ -943,6 +954,8 @@ void BytecodeReader::ParseValueSymbolTable(Function *CurrentFunction,
E = CurrentFunction->end(); I != E; ++I)
BBMap.push_back(I);
SmallVector<char, 32> NameStr;
while (moreInBlock()) {
// Symtab block header: [num entries][type id number]
unsigned NumEntries = read_vbr_uint();
@ -951,19 +964,22 @@ void BytecodeReader::ParseValueSymbolTable(Function *CurrentFunction,
for (unsigned i = 0; i != NumEntries; ++i) {
// Symtab entry: [def slot #][name]
unsigned slot = read_vbr_uint();
std::string Name = read_str();
read_str(NameStr);
Value *V = 0;
if (Typ == LabelTySlot) {
if (slot < BBMap.size())
V = BBMap[slot];
V = (slot < BBMap.size()) ? BBMap[slot] : 0;
} else {
V = getValue(Typ, slot, false); // Find mapping...
V = getValue(Typ, slot, false); // Find mapping.
}
if (Handler) Handler->handleSymbolTableValue(Typ, slot, Name);
if (Handler) Handler->handleSymbolTableValue(Typ, slot,
&NameStr[0], NameStr.size());
if (V == 0)
error("Failed value look-up for name '" + Name + "', type #" +
error("Failed value look-up for name '" +
std::string(NameStr.begin(), NameStr.end()) + "', type #" +
utostr(Typ) + " slot #" + utostr(slot));
V->setName(Name);
V->setName(&NameStr[0], NameStr.size());
NameStr.clear();
}
}
checkPastBlockEnd("Symbol Table");