<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - nullPointerConstant AST matcher triggers assert(!isNull()) in QualType::getCommonPtr"
href="https://bugs.llvm.org/show_bug.cgi?id=46353">46353</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>nullPointerConstant AST matcher triggers assert(!isNull()) in QualType::getCommonPtr
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lukasza@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>REPRO STEPS:
1. Augment TEST(NullPointerConstants, Basic) in
clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp with the following
test code:
2612 const char kTest[] = R"(
2613 template <typename T>
2614 struct MyTemplate {
2615 MyTemplate() : field_(__null) {}
2616 T* field_;
2617 };
2618 )";
2619 EXPECT_TRUE(matches(kTest, expr(nullPointerConstant())));
2. Build the unit tests:
$ cd ~/src/llvm-project/build
$ ninja tools/clang/unittests/ASTMatchers/ASTMatchersTests
3. Run the unit tests:
$ python3.7 ~/src/llvm-project/build/bin/llvm-lit -sv --param USE_Z3_SOLVER=0
~/src/llvm-project/build/tools/clang/test --filter=.*NullPointerConstants.*
EXPECTED BEHAVIOR:
1) no asserts or crashes
2) the |__null| expression is matched
ACTUAL BEHAVIOR: assert:
ASTMatchersTests:
/usr/local/google/home/lukasza/src/llvm-project/clang/include/clang/AST/Type.h:671:
const clang::ExtQualsTypeCommonBase* clang::QualType::getCommonPtr() const:
Assertion `!isNull() && "Cannot retrieve a NULL type pointer"' failed.
(I am sorry, but I don't know how to symbolize the callstack...)
NOTES:
*) The original repro used |NULL| rather than |__null|. I've used |__null|
above, to avoid having to include <stddef.h> (which is rather difficult in unit
tests, which expect self-contained inputs).
*) It seems that recently there were some changes in the AST Matchers library
that have been highlighted in the release notes:
<a href="https://clang.llvm.org/docs/ReleaseNotes.html#ast-matchers">https://clang.llvm.org/docs/ReleaseNotes.html#ast-matchers</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>