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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - setting MacroBlockBegin / MacroBlockEnd slows down clang-format 4x"
href="https://llvm.org/bugs/show_bug.cgi?id=30656">30656</a>
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<th>Summary</th>
<td>setting MacroBlockBegin / MacroBlockEnd slows down clang-format 4x
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Formatter
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
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<th>CC</th>
<td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>clang-formatting all files in blink takes about 15s on my machine. We recently
deleted the blink-specific .clang-format file which makes it fall back to the
global chromium .clang-format file. That one sets MacroBlockBegin/End, and with
that .clang-format file, reformatting all files in blink now takes about 60s.
(Deleting the MacroBlockBegin / MacroBlockEnd from our global .clang-format
file makes things fast again.)
Here's our .clang-format file:
BasedOnStyle: Chromium
Standard: Cpp11
MacroBlockBegin: "^\
BEGIN_MSG_MAP|\
BEGIN_MSG_MAP_EX|\
BEGIN_SAFE_MSG_MAP_EX|\
CR_BEGIN_MSG_MAP_EX|\
IPC_BEGIN_MESSAGE_MAP|\
IPC_BEGIN_MESSAGE_MAP_WITH_PARAM|\
IPC_PROTOBUF_MESSAGE_TRAITS_BEGIN|\
IPC_STRUCT_BEGIN|\
IPC_STRUCT_BEGIN_WITH_PARENT|\
IPC_STRUCT_TRAITS_BEGIN|\
POLPARAMS_BEGIN|\
PPAPI_BEGIN_MESSAGE_MAP$"
MacroBlockEnd: "^\
CR_END_MSG_MAP|\
END_MSG_MAP|\
IPC_END_MESSAGE_MAP|\
IPC_PROTOBUF_MESSAGE_TRAITS_END|\
IPC_STRUCT_END|\
IPC_STRUCT_TRAITS_END|\
POLPARAMS_END|\
PPAPI_END_MESSAGE_MAP$"
This looks reasonably short and shouldn't slow down formatting 4x. (I'm not
sure if ^ has higher precedence than |, but changing the regexen to "^(a|b|c)$"
didn't change performance)</pre>
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