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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [clang-analyzer] False report about virtual method during construction"
href="https://bugs.llvm.org/show_bug.cgi?id=48482">48482</a>
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<th>Summary</th>
<td>[clang-analyzer] False report about virtual method during construction
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>dcoughlin@apple.com
</td>
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<th>Reporter</th>
<td>dmitry.polukhin@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Minimal reproducer:
// clang++ --analyze -Xanalyzer -analyzer-output=text -Xanalyzer
-analyzer-checker='optin.cplusplus'
class Attribute {
public:
virtual ~Attribute() = default;
virtual int encode() const = 0;
protected:
Attribute() {}
};
class Number : public Attribute {
public:
explicit Number()
: Attribute() {}
int encode() const override;
private:
int number_;
};
void foo() {
Number number;
number.encode();
}
Output:
test.cpp:23:3: warning: Call to virtual method 'Number::encode' during
construction bypasses virtual dispatch
number.encode();
^~~~~~~~~~~~~~~~~~~~~~
test.cpp:23:3: note: Call to virtual method 'Number::encode' during
construction bypasses virtual dispatch
number.encode();
^~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
To trigger this bug it is required to have uninitialised in c-tor member
`number_`. In full example the member was initialised later with member
function call before calling the virtual function. Problem exists starting from
at least clang 9 up to current trunk.</pre>
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