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speedup the common case where nothing needs to be quoted

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24294 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-11-10 21:47:01 +00:00
parent 91150e5d46
commit bc076665cb
1 changed files with 20 additions and 7 deletions
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27
lib/VMCore/Mangler.cpp
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@ -65,16 +65,29 @@ std::string Mangler::makeNameProper(const std::string &X, const char *Prefix) {
if (*I >= '0' && *I <= '9')
NeedsQuotes = true;
for (std::string::const_iterator E = X.end(); I != E; ++I)
// Do an initial scan of the string, checking to see if we need quotes or
// to escape a '"' or not.
if (!NeedsQuotes)
for (std::string::const_iterator E = X.end(); I != E; ++I)
if (!isCharAcceptable(*I)) {
NeedsQuotes = true;
break;
}
// In the common case, we don't need quotes. Handle this quickly.
if (!NeedsQuotes)
return Result + X;
// Otherwise, construct the string the expensive way.
I = X.begin();
if (*I == 1) ++I; // Skip the marker if present.
for (std::string::const_iterator E = X.end(); I != E; ++I) {
if (*I == '"')
Result += "_QQ_";
else {
if (!isCharAcceptable(*I))
NeedsQuotes = true;
else
Result += *I;
}
if (NeedsQuotes)
Result = '"' + Result + '"';
}
Result = '"' + Result + '"';
}
return Result;
}