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src: fix StringSearch compiler warning by sam-github · Pull Request #31798 · nodejs/node

@sam-github 

StringSearchBase has tables (int array members) that are used only for
some search strategies, but g++-9 (at least) doesn't understand when
they will or will not be used. Default-initialize them in the
constructor to avoid this warning:

	In file included from ../../src/node_buffer.cc:29:
	../../src/string_search.h: In function ‘size_t node::stringsearch::SearchString(node::stringsearch::Vector<const Char>, node::stringsearch::Vector<const Char>, size_t) [with Char = short unsigned int]’:
	../../src/string_search.h:113:30: warning: ‘search’ may be used uninitialized in this function [-Wmaybe-uninitialized]
		113 |     return (this->*strategy_)(subject, index);
				|            ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
	../../src/string_search.h: In function ‘size_t node::stringsearch::SearchString(node::stringsearch::Vector<const Char>, node::stringsearch::Vector<const Char>, size_t) [with Char = unsigned char]’:
	../../src/string_search.h:113:30: warning: ‘search’ may be used uninitialized in this function [-Wmaybe-uninitialized]
		113 |     return (this->*strategy_)(subject, index);
				|            ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~

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Feb 14, 2020

bnoordhuis added a commit to bnoordhuis/io.js that referenced this pull request

Feb 15, 2020 
Turn the `strategy_` method pointer into an enum-based static dispatch.

It's both safer and more secure (no chance of method pointer corruption)
and it helps GCC see that the shift and suffix tables it's complaining
about are unused in single char search mode.

Fixes the following warning:

    ../src/string_search.h:113:30: warning:
    ‘search’ may be used uninitialized in this function [-Wmaybe-uninitialized]
         return (this->*strategy_)(subject, index);

Fixes: nodejs#26733
Fixes: nodejs#31532
Fixes: nodejs#31798

addaleax pushed a commit that referenced this pull request

Mar 11, 2020 
Turn the `strategy_` method pointer into an enum-based static dispatch.

It's both safer and more secure (no chance of method pointer corruption)
and it helps GCC see that the shift and suffix tables it's complaining
about are unused in single char search mode.

Fixes the following warning:

    ../src/string_search.h:113:30: warning:
    ‘search’ may be used uninitialized in this function [-Wmaybe-uninitialized]
         return (this->*strategy_)(subject, index);

Fixes: #26733
Refs: #31532
Refs: #31798
PR-URL: #31809
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

MylesBorins pushed a commit that referenced this pull request

Mar 11, 2020 
Turn the `strategy_` method pointer into an enum-based static dispatch.

It's both safer and more secure (no chance of method pointer corruption)
and it helps GCC see that the shift and suffix tables it's complaining
about are unused in single char search mode.

Fixes the following warning:

    ../src/string_search.h:113:30: warning:
    ‘search’ may be used uninitialized in this function [-Wmaybe-uninitialized]
         return (this->*strategy_)(subject, index);

Fixes: #26733
Refs: #31532
Refs: #31798
PR-URL: #31809
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

targos pushed a commit that referenced this pull request

Apr 22, 2020 
Turn the `strategy_` method pointer into an enum-based static dispatch.

It's both safer and more secure (no chance of method pointer corruption)
and it helps GCC see that the shift and suffix tables it's complaining
about are unused in single char search mode.

Fixes the following warning:

    ../src/string_search.h:113:30: warning:
    ‘search’ may be used uninitialized in this function [-Wmaybe-uninitialized]
         return (this->*strategy_)(subject, index);

Fixes: #26733
Refs: #31532
Refs: #31798
PR-URL: #31809
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>