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Title: added `TokenList::Stream` class to wrap `std::istream` usage and implemented alternative C I/O version by firewave · Pull Request #244 · cppcheck-opensource/simplecpp · GitHub

Open Graph Title: added `TokenList::Stream` class to wrap `std::istream` usage and implemented alternative C I/O version by firewave · Pull Request #244 · cppcheck-opensource/simplecpp

X Title: added `TokenList::Stream` class to wrap `std::istream` usage and implemented alternative C I/O version by firewave · Pull Request #244 · cppcheck-opensource/simplecpp

Description: Reading the file via std::istream includes a considerable overhead caused by std::istream::sentry and others. Using C I/O instead reduces the "total Ir" usage by about 10%. Testing with -q -Ilib/ -D__GNUC__ lib/valueflow.cpp: Clang 13 271,013,439 -> 269,398,283 -> 244,353,123 GCC 11 -> -> `` The intermediate value shows the improvement if we only change the actual input file. The last value if we also do it for all the includes which does not require you to use the new interface function. So we even if you do not change the application which uses this it would still result in a sizable improvement.

Open Graph Description: Reading the file via std::istream includes a considerable overhead caused by std::istream::sentry and others. Using C I/O instead reduces the "total Ir" usage by about 10%. Testing with -...

X Description: Reading the file via std::istream includes a considerable overhead caused by std::istream::sentry and others. Using C I/O instead reduces the "total Ir" usage by about 10%. Testin...

Opengraph URL: https://github.com/cppcheck-opensource/simplecpp/pull/244

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added TokenList::Stream class to wrap std::istream usage and implemented alternative C I/O version https://github.com/cppcheck-opensource/simplecpp/pull/244/files#top
Show all changes 21 commits https://github.com/cppcheck-opensource/simplecpp/pull/244/files
097a765 added wrapper class "Stream" to TokenList firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/097a7658473912c062e3836813dbb29f4d541a0f
c2ae449 moved some helper function into TokenList::Stream firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/c2ae44915d81595152207b7812eb035bb30914f2
62acc58 simplified UTF-16 checks firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/62acc5826dc822345898100ebc4df504c6acc844
a2cc676 made simplecpp::TokenList::Stream an abstract class and moved impleme… firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/a2cc676ccbe2fafaafb9baffa06c0086f177351e
07ec136 added simplecpp::TokenList::Stream implementation "FileStream" which … firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/07ec136dc71d89bfd4d363bab2daf133bcf43396
81fe8cd use FileStream for includes as well firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/81fe8cdcac58bd1d9b032651b45cf7192ef31684
4f0da78 constness firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/4f0da7842a3f5b3de1a90c1ebf251b674ccc634c
1b52b22 made some TokenList::Stream members private firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/1b52b2211ff058a74174e0a53facedb0d464d9d2
95c747b pulled out repeated UTF-16 character generation code firewave Mar 5, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/95c747b6a99dde5e17056b13d6ab265451b598c3
892183e main.cpp: added command-option "-is" to specify usage of std::istream… firewave Mar 9, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/892183ecbdf32ae2be55d2032905c5ab9e757c9b
26ccd24 test.cpp: got rid of another `std::istringstream` usage firewave Apr 14, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/26ccd246db7cec3335d416987d1d89f124cc191e
e57f312 fixed FileStream::unget() with subsequent calls (i.e. UTF-16 encoding) firewave Apr 19, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/e57f3128db5ee20551b8ac8b7445845b371d7d15
bdc7f3c simplified newline handling in TokenList::Stream::readChar() firewave Apr 19, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/bdc7f3c34521364eb61f469c7e3a5e29d3bb02a7
76b94e3 fixed handling of incomplete UTF-8 BOM 0xefbbbf firewave Apr 19, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/76b94e3ba988688be06eea9fe5cd641260044959
cd084ae test.cpp: added tests for incomplete UTF sequences firewave Apr 19, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/cd084aeecdd9dcdf0de43473b404dd475edace8e
797f899 keep lastCh intact when using FileStream::peek() firewave Apr 20, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/797f899da9141b3fb46b79a1e075902927be10b3
c1da435 fixed uninitialized members in `FileStream` firewave Oct 6, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/c1da435de1410e1210770642b6b084ad59a14b10
52b4b61 .clang-tidy: disabled `modernize-use-override` warning firewave Oct 6, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/52b4b61a8fddc249382c81d30aa771955fe4dcd3
7ff8c98 fixed `readability-inconsistent-declaration-parameter-name` clean-tid… firewave Oct 6, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/7ff8c9899c203b7ddd48f34cbaf7c914138f28fa
c9605fe fixed `-Wshadow` Clang compiler warning firewave Oct 6, 2022 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/c9605feec619bc1aa560e73d1d4a858cdc794062
557099c adjusted parameter order in added `TokenList()` constructor / added s… firewave Feb 25, 2023 https://github.com/cppcheck-opensource/simplecpp/pull/244/commits/557099c46446fa20eff89ecd619ceec26772ee02
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