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CheckClassImpl::virtualDestructor() scanned the whole variable list and the whole token list for every (derived class, public base class) pair. With many template instantiations (for example etl) this took up to 26% of the analysis time. When the first base class is checked, the pointer variables of each type are collected and a single pass over the tokens records, for each pointer variable, the classes 'Derived' of a "ptr = new Derived" that is followed by a "delete ptr;". Checking a pair is then a lookup. This also fixes a false negative: the name of a template instantiation such as 'Derived < int >' is a single token that contains spaces, so the old pattern "new Derived < int >" never matched it and the pair was never reported. On a project using etl, glaze and Catch2 (211 translation units in two configurations) total CPU time drops from 88.7 to 61.6 minutes, with identical output for every translation unit.
Tokenizer::setVarIdPass2() tried every out-of-class member definition for every class. matchMemberName() can only succeed when the innermost scope name of the class matches a name in the member's scope, in one of its "using namespace" or in its qualification. The members are now indexed by those names, in their original order, so each class only tries its candidates. The index and matchMemberName() walk the qualification with the same skipQualification(). On the same project total CPU time drops further from 61.6 to 52.9 minutes, with identical output for every translation unit.
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There should probably be a trac ticket for this PR. Please create it, or ask us to create it. Then the PR title should be updated. |
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Ah, could you create one for me? Or is there a way for me to create them?
There is another pretty sizeable performance improvement I'm working on.
This time in reducing tokens being read many times over. But that'll take a
bit longer.
Once there's a trac ticket for this PR I'll update it.
Met vriendelijke groet,
Michael de Lang
…On Sun, 25 Oct 2026, 23:01 Daniel Marjamäki, ***@***.***> wrote:
*dmcppcheck* left a comment (cppcheck-opensource/cppcheck#8960)
<#8960 (comment)>
There should probably be a trac ticket for this PR. Please create it, or
ask us to create it. Then the PR title should be updated.
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Two improvements:
On my own private project, the total CPU time dropped from 88.7 minutes down to 52.9 minutes. Oh, and this also fixes a false negative:
new Derived < int >would never match, and it does now. See some tests I added.