r173976 - Diagnostics: if a line is longer than 4096 characters, don't print it.
Jordan Rose
jordan_rose at apple.com
Wed Jan 30 13:41:07 PST 2013
Author: jrose
Date: Wed Jan 30 15:41:07 2013
New Revision: 173976
URL: http://llvm.org/viewvc/llvm-project?rev=173976&view=rev
Log:
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>
Modified:
cfe/trunk/lib/Frontend/TextDiagnostic.cpp
cfe/trunk/test/Misc/diag-line-wrapping.cpp
Modified: cfe/trunk/lib/Frontend/TextDiagnostic.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Frontend/TextDiagnostic.cpp?rev=173976&r1=173975&r2=173976&view=diff
==============================================================================
--- cfe/trunk/lib/Frontend/TextDiagnostic.cpp (original)
+++ cfe/trunk/lib/Frontend/TextDiagnostic.cpp Wed Jan 30 15:41:07 2013
@@ -1096,18 +1096,26 @@ void TextDiagnostic::emitSnippetAndCaret
unsigned LineNo = SM.getLineNumber(FID, FileOffset);
unsigned ColNo = SM.getColumnNumber(FID, FileOffset);
+
+ // Arbitrarily stop showing snippets when the line is too long.
+ static const unsigned MaxLineLength = 4096;
+ if (ColNo > MaxLineLength)
+ return;
// Rewind from the current position to the start of the line.
const char *TokPtr = BufStart+FileOffset;
const char *LineStart = TokPtr-ColNo+1; // Column # is 1-based.
-
// Compute the line end. Scan forward from the error position to the end of
// the line.
const char *LineEnd = TokPtr;
while (*LineEnd != '\n' && *LineEnd != '\r' && *LineEnd != '\0')
++LineEnd;
+ // Arbitrarily stop showing snippets when the line is too long.
+ if (LineEnd - LineStart > MaxLineLength)
+ return;
+
// Copy the line of code into an std::string for ease of manipulation.
std::string SourceLine(LineStart, LineEnd);
Modified: cfe/trunk/test/Misc/diag-line-wrapping.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Misc/diag-line-wrapping.cpp?rev=173976&r1=173975&r2=173976&view=diff
==============================================================================
--- cfe/trunk/test/Misc/diag-line-wrapping.cpp (original)
+++ cfe/trunk/test/Misc/diag-line-wrapping.cpp Wed Jan 30 15:41:07 2013
@@ -1,4 +1,5 @@
// RUN: %clang_cc1 -fsyntax-only -fmessage-length 60 %s 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -fsyntax-only -fmessage-length 0 %s 2>&1 | FileCheck %s
struct B { void f(); };
struct D1 : B {};
@@ -10,4 +11,13 @@ struct DD : D1, D2 {
// CHECK: {{.*}}: error:
// CHECK: struct DD -> struct D1 -> struct B
// CHECK: struct DD -> struct D2 -> struct B
-}
+};
+
+// A line longer than 4096 characters should cause us to suppress snippets no
+// matter what -fmessage-length is set to.
+#pragma clang diagnostic push
+#pragma clang diagnostic warning "-Wconversion"
+// CHECK: implicit conversion loses floating-point precision
+// CHECK-NOT: static const float numbers[]
+static const float numbers[] = {0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.4117647058823529,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.3529411764705883,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.4117647058823529,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.4705882352941176,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.4117647058823529,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.4705882352941176,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.5294117647058824,0.1176470588235294,0.1176470588235294,0.11764
70588235294,0.1176470588235294,0.2941176470588235,0.4705882352941176,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.2941176470588235,0.5294117647058824,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.5294117647058824,0.4117647058823529,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.1764705882352941,0.3529411764705883,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.1764705882352941,0.4117647058823529,0.4117647058823529,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.2352941176470588,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.2352941176470588,0.4117647058823529,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.2352941176470588,0.4705882352941176,0.411764
7058823529,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.2941176470588235,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.2941176470588235,0.4705882352941176,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.2941176470588235,0.5294117647058824,0.4117647058823529,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.3529411764705883,0.2941176470588235,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.1764705882352941,0.3529411764705883,0.5294117647058824,0.3529411764705883,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.2352941176470588,0.1176470588235294,0.4117647058823529,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.2352941176470588,0.1764705882352941,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.2352941176470588,0.4117647058823529,0.3529411764705883,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.2941176
470588235,0.1764705882352941,0.4117647058823529,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.2941176470588235,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.2941176470588235,0.4705882352941176,0.3529411764705883,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.3529411764705883,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.3529411764705883,0.5294117647058824,0.3529411764705883,0.1176470588235294,0.1176470588235294,0.2352941176470588,0.4117647058823529,0.2941176470588235,0.2941176470588235,0.1176470588235294,0.1176470588235294,0.2941176470588235,0.2941176470588235,0.1176470588235294,0.3529411764705883,0.1176470588235294,0.1176470588235294,0.2941176470588235,0.2941176470588235,0.1764705882352941,0.2941176470588235,0.1176470588235294,0.1176470588235294,0.2941176470588235,0.3529411764705883,0.1764705882352941,0.3529411764705883,0.1176470588235294,0.11764705
88235294,0.2941176470588235,0.3529411764705883,0.2352941176470588,0.2941176470588235,0.1176470588235294,0.1176470588235294,0.2941176470588235,0.4117647058823529,0.2352941176470588,0.2941176470588235,0.1176470588235294,0.1176470588235294,0.2941176470588235,0.4705882352941176,0.2941176470588235,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.3529411764705883,0.1176470588235294,0.2941176470588235,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.3529411764705883,0.1764705882352941,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.4117647058823529,0.1764705882352941,0.2941176470588235,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.4117647058823529,0.2352941176470588,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.4705882352941176,0.2352941176470588,0.2352941176470588,0.1176470588235294,0.1176470588235294,0.3529411764705883,0.5294117647058824,0.2941176470588235,0.176470588
2352941,0.1176470588235294,0.1176470588235294,0.4117647058823529};
+#pragma clang diagnostic pop
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