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Add macro BOOST_GET to enrich the error information of boost :: get by chenwhql · Pull Request #24175 · PaddlePaddle/Paddle · GitHub
chenwhql
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Add macro BOOST_GET_SAFELY to enrich the error information of boost :: get
Add macro BOOST_GET to enrich the error information of boost :: get
May 9, 2020
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Add macro BOOST_GET to enrich the error information of boost :: get #24175
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Merged
chenwhql
merged 9 commits into
PaddlePaddle:develop
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chenwhql:easyuse/add_boost_get_safely_macro
May 11, 2020
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Add macro BOOST_GET to enrich the error information of boost :: get #24175
chenwhql
merged 9 commits into
PaddlePaddle:develop
from
chenwhql:easyuse/add_boost_get_safely_macro
May 11, 2020
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phlrain
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Apr 27, 2020
paddle/fluid/platform/enforce.h
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| "(%s) by type %s, its type is %s.", \ | ||
| #__VALUE, paddle::platform::demangle(typeid(__TYPE).name()), \ | ||
| paddle::platform::demangle(__VALUE.type().name()))); \ | ||
| } \ |
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这个boost::get 除了 bad_get 还有其他情况的异常么， 需要不要 catch(...) 捕获其他的异常
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仅会抛出bad_get异常
看了下源码：https://www.boost.org/doc/libs/1_58_0/boost/variant/get.hpp
里面如果get失败，一律抛出bad_get
chenwhql
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luotao1
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LGTM!!
lanxianghit
approved these changes
May 9, 2020
raindrops2sea
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May 11, 2020
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boost::getis not a completely safe interface, although it will not go wrong in most cases, but in extreme case, if may fail and directly throw aboost::bad_getexception without any stack information. This kind of problem is difficult to debug.Related issues:
Now there are nearly 600
boost :: getin paddle without catch exception when used.In this PR, I add new series macros
BOOST_GET{***}, It encapsulatesboost :: getas follows:Use this macro instead of
boost :: get, when something goes wrong, we can get richer error information . Including the error file, line number, expected value type and actual value type, this can help users to locate the cause of the error easily.difficulty
The
boost :: gethas 4 types of return value, includeT, const T, T&, const T&, so here need some tricks to cover these 4 scenarios with only one macro. With the help of @sneaxiy, under the gcc5.4 environment, we solved this problem with only one macro, see the commit 11bbbb2.But CI now using gcc4.8, the writing above cannot be compiled under gcc4.8, this is a gcc4.8’s bug, gcc official recommends to use a higher version to solve. So I had to write three macros here to solve this problem, as follows:
Examples:
Case 1: Place Get Error
1. original
boost::getthis is a C++ exception, but using
boost::getdirectly cannot throw C++ error info.code piece
2. new macro
BOOST_GETCase 2: Attr Get Error
1. original
boost::get2. new macro
BOOST_GETCI check
In order to avoid the direct use of
boost :: get, I added a new rule to CI to limit the use ofboost :: get. If found, it will remind developer to use the macroBOOST_GET(_**) series macros.