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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/121213/">https://git.reviewboard.kde.org/r/121213/</a>
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<p style="margin-top: 0;">On November 22nd, 2014, 11:20 nachm. UTC, <b>Thomas Lübking</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/121213/diff/1/?file=329504#file329504line717" style="color: black; font-weight: bold; text-decoration: underline;">kdecore/io/kdebug.cpp</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">K_GLOBAL_STATIC(KDebugPrivate, kDebug_data)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">const</span> <span class="kt">int</span> <span class="n">mangledNameEnd</span> <span class="o">=</span> <span class="n">in</span><span class="p">.</span><span class="n">indexOf</span><span class="p">(</span><span class="s">" + "</span><span class="p">,</span> <span class="n">mangledNameStart</span> <span class="o">+</span> <span class="mi">2</span><span class="p">);</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Why do you need to sharpen the match?</p></pre>
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<p>On November 22nd, 2014, 11:32 nachm. UTC, <b>René J.V. Bertin</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Because otherwise the symbol to be demangled is left with a trailing space, which causes the demangle to fail. Wanna know how I know?</p></pre>
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<p>On November 22nd, 2014, 11:44 nachm. UTC, <b>Thomas Lübking</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Don't know about the GCC behavior on trailing spaces, but one should probably have some "while (in.at(mangledNameEnd) == ' ') --mangledNameEnd;" loop?</p></pre>
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<p>On November 23rd, 2014, 12:20 vorm. UTC, <b>René J.V. Bertin</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">One could, but why? The start is found with a string, I don't see why the end wouldn't be, given that that loop of yours will always loop just once ...</p></pre>
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<p>On November 23rd, 2014, 12:31 vorm. UTC, <b>Thomas Lübking</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">... or not at all or thrice - depending on how the mangler feels today.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">What I mean is that if untrimmed strings are a problem for demangling, one should seek to get rid of all the whitespace generically - i don't care about whether seeking for a string or char, this context is hardly performance critical.</p></pre>
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<p>On November 24th, 2014, 5:53 nachm. UTC, <b>René J.V. Bertin</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">this particular bit of whitespace has nothing to do with the mangler or how it feels today. It's formatting done by the backtrace function, which clearly always puts a space-padded <code style="text-rendering: inherit;color: #4444cc;padding: 0;white-space: normal;margin: 0;line-height: inherit;">+</code> rather than one without padding as under Linux.
Frankly, in general I'd agree with you, but here I don't see any reason to make the code more complex than it is.</p></pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">backtrace() is provided by glibc resp. the apple (darwin) libc (i hope).
-> What provides /usr/include/execinfo.h on OSX?
That's what is needed to be detected (I assume this would affect <em style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">all</em> BSD variants?)</p>
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I don't see any reason to make the code more complex than it is.</p>
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">If we're dealing w/ unspecified output and need to sanitize it, we may have to do this generically if we must consider random toolchains aside gcc+glibc.
I know that you only care about OSX, but actually OSX is just a good testcase to see whether the code is "correct" or just happens to work.</p>
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<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Do you compile with gcc or clang?</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Did you check whether the glibc backtrace() output is actually stripped?</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">What if we compile glibc w/ llvm and glibc backtrace() fires padded " + " which llvm __cxa_demangle() cannot handle? (ok, rethorical question ;-)</li>
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<p>- Thomas</p>
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<p>On November 24th, 2014, 6:37 nachm. UTC, René J.V. Bertin wrote:</p>
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<div>Review request for KDE Software on Mac OS X and kdelibs.</div>
<div>By René J.V. Bertin.</div>
<p style="color: grey;"><i>Updated Nov. 24, 2014, 6:37 nachm.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
kdelibs
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This patch adapts the parser in <code style="text-rendering: inherit;color: #4444cc;padding: 0;white-space: normal;margin: 0;line-height: inherit;">maybeDemangledName</code> to the backtrace obtained in <code style="text-rendering: inherit;color: #4444cc;padding: 0;white-space: normal;margin: 0;line-height: inherit;">kRealBacktrace</code> on OS X.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Works as expected on OS X 10.9.4 .</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>kdecore/io/kdebug.cpp <span style="color: grey">(872a05a)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/121213/diff/" style="margin-left: 3em;">View Diff</a></p>
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