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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Control flow analysis is missing for Obj-C @try/@catch/@finally, -Wreturn-type not produced"
href="https://bugs.llvm.org/show_bug.cgi?id=46693">46693</a>
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<th>Summary</th>
<td>Control flow analysis is missing for Obj-C @try/@catch/@finally, -Wreturn-type not produced
</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
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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
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jacob@bandes-stor.ch
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Symptom: an Objective-C method declared as returning non-void, but without a
return statement, produces no warning if the method contains an Obj-C exception
handling block.
- (int)foo {
// Missing return, -Wreturn-type is produced
}
- (int)bar {
@try { }
@finally { }
// Missing return but no warning!
}
Root cause:
CFGBuilder simply does not have an implementation for ObjCAtTryStmt,
ObjCAtCatchStmt, etc. It's been missing for 11 years.
There was briefly partial support:
<a href="https://github.com/llvm/llvm-project/commit/89cc8ea794b79d6dfd1aa50c665e352791ffa15c">https://github.com/llvm/llvm-project/commit/89cc8ea794b79d6dfd1aa50c665e352791ffa15c</a>
But it was removed:
<a href="https://github.com/llvm/llvm-project/commit/89be6526c3a75f608d2c00c18bde8413547aa509">https://github.com/llvm/llvm-project/commit/89be6526c3a75f608d2c00c18bde8413547aa509</a></pre>
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</p>
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