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<p>Hi Alexey,</p>
<p>you can maybe implement your checks in clang-tidy as a separate
module. CFG analysis and matchers are easily usable there.</p>
<p>You can emit errors with `diag()`, which is used in all checks to
emit the warnings.</p>
<p>Sincerely Jonas<br>
</p>
<br>
<div class="moz-cite-prefix">Am 11.05.2018 um 12:22 schrieb Sachkov,
Alexey via cfe-dev:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to ask what do you think about
having possibility to emit errors from clang StaticAnalyzer?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Recently I encountered a problem with
implementing complex diagnostics in clang (which requires call
graph analysis, for example): it is hard to implement such
diagnostics in Sema because there is no place with fully-built
AST.<o:p></o:p></p>
<p class="MsoNormal">So, I used static analyzer and implemented
a few additional checkers, but the problem with static
analyzer is that all diagnostics are emitted as warnings.<o:p></o:p></p>
<p class="MsoNormal">Here is an example of the patch I would
like to commit: <a
href="https://github.com/AlexeySachkov/clang/commit/898c9c566d4c1c37c2d56787fd08ff8b1697aca9"
moz-do-not-send="true">
https://github.com/AlexeySachkov/clang/commit/898c9c566d4c1c37c2d56787fd08ff8b1697aca9</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What do you think?<o:p></o:p></p>
<p class="MsoNormal">If there are no objections from adding
possibility to emit errors from static analyzer, I will put a
patch for review. Any comments on implementation?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My main task is to implement some
diagnostic messages, probably someone can advise me a better
solution than static analyzer? Here an example (I’m interested
in OpenCL C):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">int val __attribute__((my_attr1));<o:p></o:p></p>
<p class="MsoNormal">void func() {<o:p></o:p></p>
<p class="MsoNormal"> val = 10; // expected-error{{variables
declared with my_attr1 attribute cannot be used from kernels
declared with my_attr2 attribute}}<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal">__attribute__((my_attr2))<o:p></o:p></p>
<p class="MsoNormal">__kernel void my_kernel() {<o:p></o:p></p>
<p class="MsoNormal"> func();<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I knew that call graph analysis is used in
Sema during compilation of CUDA sources and if static analyzer
is completely wrong place for such stuff, I can try to use
CUDA approach and update the Sema.<o:p></o:p></p>
<p class="MsoNormal">Also I wouldn’t like to use clang plugins
or to create a clang-based tool.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards,<o:p></o:p></p>
<p class="MsoNormal">Alexey Sachkov<o:p></o:p></p>
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