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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [clang][ParseEnum] Crashed: Enum with invalid use of incomplete type"
href="https://bugs.llvm.org/show_bug.cgi?id=51554">51554</a>
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<th>Summary</th>
<td>[clang][ParseEnum] Crashed: Enum with invalid use of incomplete type
</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>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>guopeilin1@huawei.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>I have a test case where clang should give an error message rather than a
crash.
The test command is `clang++ -O2 test.cpp`
The test case is as follows:
enum E { e = E() };
int main() {
return 0;
}
The error message should be like the following:
test.cpp:1:14: error: invalid use of incomplete type 'E'
enum E { e = E() };
^~~
test.cpp:1:6: note: definition of 'E' is not complete until the closing '}'
enum E { e = E() };
However, the trunk get crashed with the assertion
The bug message:
```
./clang/include/clang/AST/Type.h:677: const clang::ExtQualsTypeCommonBase*
clang::QualType::getCommonPtr() const: Assertion `!isNull() && "Cannot retrieve
a NULL type pointer"' failed.
```
I did a simple analysis.
In ParseDecl.cpp:
1. llvm-10:
AssignedVal.get(): NULL
2. llvm-12(Context.getLangOpts().RecoveryASTType: default
false)(early-version):
AssignedVal.get(): RecoveryExpr 0xaaaaba19df20 '<dependent type>'
contains-errors lvalue
3. llvm-12(Context.getLangOpts().RecoveryASTType: default true)
(latest-version, Finally crashed):
AssignedVal.get()->dump(): RecoveryExpr 0xaaaabb4d9500 'enum E'
contains-errors
In CheckEnumConstant(), EltTy(type: QualType, value: EnumType 0xaaaabb517dd0
'enum E') cannot use getIntWidth(), so crashed. But the code doesn't seem to be
wrong around here.</pre>
</div>
</p>
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