[cfe-commits] r97324 - /cfe/trunk/lib/Frontend/PrintPreprocessedOutput.cpp

[Daniel Dunbar]

On Sat, Feb 27, 2010 at 9:53 AM, Chris Lattner <clattner at apple.com> wrote:
>
> On Feb 27, 2010, at 6:22 AM, Benjamin Kramer wrote:
>
>> Author: d0k
>> Date: Sat Feb 27 08:22:08 2010
>> New Revision: 97324
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=97324&view=rev
>> Log:
>> Simplify code.
>
> We actually don't want this.  This code is highly performance sensitive in the -E path.

It would be interesting to measure the actual impact of this.

 - Daniel

> -Chris
>
>>
>> Modified:
>>    cfe/trunk/lib/Frontend/PrintPreprocessedOutput.cpp
>>
>> Modified: cfe/trunk/lib/Frontend/PrintPreprocessedOutput.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Frontend/PrintPreprocessedOutput.cpp?rev=97324&r1=97323&r2=97324&view=diff
>> ==============================================================================
>> --- cfe/trunk/lib/Frontend/PrintPreprocessedOutput.cpp (original)
>> +++ cfe/trunk/lib/Frontend/PrintPreprocessedOutput.cpp Sat Feb 27 08:22:08 2010
>> @@ -390,7 +390,7 @@
>> static void PrintPreprocessedTokens(Preprocessor &PP, Token &Tok,
>>                                     PrintPPOutputPPCallbacks *Callbacks,
>>                                     llvm::raw_ostream &OS) {
>> -  char Buffer[256];
>> +  llvm::SmallString<256> Buffer;
>>   Token PrevTok;
>>   while (1) {
>>
>> @@ -406,29 +406,13 @@
>>       OS << ' ';
>>     }
>>
>> -    if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
>> -      OS << II->getName();
>> -    } else if (Tok.isLiteral() && !Tok.needsCleaning() &&
>> -               Tok.getLiteralData()) {
>> -      OS.write(Tok.getLiteralData(), Tok.getLength());
>> -    } else if (Tok.getLength() < 256) {
>> -      const char *TokPtr = Buffer;
>> -      unsigned Len = PP.getSpelling(Tok, TokPtr);
>> -      OS.write(TokPtr, Len);
>> -
>> -      // Tokens that can contain embedded newlines need to adjust our current
>> -      // line number.
>> -      if (Tok.getKind() == tok::comment)
>> -        Callbacks->HandleNewlinesInToken(TokPtr, Len);
>> -    } else {
>> -      std::string S = PP.getSpelling(Tok);
>> -      OS.write(&S[0], S.size());
>> -
>> -      // Tokens that can contain embedded newlines need to adjust our current
>> -      // line number.
>> -      if (Tok.getKind() == tok::comment)
>> -        Callbacks->HandleNewlinesInToken(&S[0], S.size());
>> -    }
>> +    llvm::StringRef Str = PP.getSpelling(Tok, Buffer);
>> +    OS << Str;
>> +    // Tokens that can contain embedded newlines need to adjust our current
>> +    // line number.
>> +    if (Tok.getKind() == tok::comment)
>> +      Callbacks->HandleNewlinesInToken(Str.data(), Str.size());
>> +
>>     Callbacks->SetEmittedTokensOnThisLine();
>>
>>     if (Tok.is(tok::eof)) break;
>>
>>
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>
>
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