Diagnostics: if a line is longer than 4096 characters, don't print it.
Specifically, don't print snippets, caret diagnostics, or ranges for lines over 4096 characters. We copy the line around a few times in our diagnostics machinery, and we have to print a caret line that's just as long. This uses a lot of memory just to create a poor user experience as we print out a line much too long for anyone to read...or spend extra energy trying to fit it to -fmessage-length. <rdar://problem/13106850> llvm-svn: 173976
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@ -1096,18 +1096,26 @@ void TextDiagnostic::emitSnippetAndCaret(
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unsigned LineNo = SM.getLineNumber(FID, FileOffset);
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unsigned ColNo = SM.getColumnNumber(FID, FileOffset);
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// Arbitrarily stop showing snippets when the line is too long.
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static const unsigned MaxLineLength = 4096;
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if (ColNo > MaxLineLength)
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return;
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// Rewind from the current position to the start of the line.
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const char *TokPtr = BufStart+FileOffset;
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const char *LineStart = TokPtr-ColNo+1; // Column # is 1-based.
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// Compute the line end. Scan forward from the error position to the end of
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// the line.
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const char *LineEnd = TokPtr;
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while (*LineEnd != '\n' && *LineEnd != '\r' && *LineEnd != '\0')
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++LineEnd;
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// Arbitrarily stop showing snippets when the line is too long.
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if (LineEnd - LineStart > MaxLineLength)
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return;
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// Copy the line of code into an std::string for ease of manipulation.
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std::string SourceLine(LineStart, LineEnd);
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File diff suppressed because one or more lines are too long
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