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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Analyzer doesn't know sizeof(id)==sizeof(NSObject *), causes false +ve"
href="http://llvm.org/bugs/show_bug.cgi?id=15836">15836</a>
</td>
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<tr>
<th>Summary</th>
<td>Analyzer doesn't know sizeof(id)==sizeof(NSObject *), causes false +ve
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.2
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>iamleeg@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This is tested with Xcode 4.6.2's analyzer, I haven't had the opportunity to
test with clang trunk yet.
Test case:
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
@autoreleasepool {
__unsafe_unretained NSObject **objectArray = (__unsafe_unretained
NSObject **)malloc(sizeof(id) * 10);
free(objectArray);
}
return 0;
}
Actual result:
Result of 'malloc' is converted to a pointer of type 'NSObject
*__unsafe_unretained', which is incompatible with sizeof operand type 'id'
Expected result:
There shouldn't be an issue. The type outside the malloc() call is a pointer to
an object of the same size as the type inside the sizeof() macro—a pointer to
an Objective-C object.
Workaround:
change the type inside sizeof to "NSObject *". This suppresses the analyzer
report, which specifically occurs when the analyzer compares 'id' to a typed
ObjC object pointer.</pre>
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</p>
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