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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Cannot jump to switch label when using blocks and ARC"
href="https://llvm.org/bugs/show_bug.cgi?id=25294">25294</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Cannot jump to switch label when using blocks and ARC
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>warp@iki.fi
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>clang reports version: Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin14.5.0
Consider the following code:
//-----------------------------------------------------------
int foo(int i)
{
NSString* str = [NSString new];
int(^func)() = nil;
switch(i)
{
case 0: func = ^{ return (int)str.length; }; break;
case 1: func = ^{ return (int)str.length; }; break;
}
return func();
}
//-----------------------------------------------------------
When compiling with ARC enabled, it gives the following error:
test.m:10:7: error: cannot jump from switch statement to this case label
case 1: func = ^{ return (int)str.length; }; break;
^
test.m:5:15: note: jump enters lifetime of block which strongly captures a
variable
NSString* str = [NSString new];
Note that these functions do not cause an error:
//-----------------------------------------------------------
int foo2(int i)
{
int value = i * 2;
int(^func)() = nil;
switch(i)
{
case 0: func = ^{ return value * 2; }; break;
case 1: func = ^{ return value * 3; }; break;
}
return func();
}
int(^foo3(int i))()
{
NSString* str = [NSString new];
switch(i)
{
case 0: return ^{ return (int)str.length; };
case 1: return ^{ return (int)str.length; };
}
return 0;
}
//-----------------------------------------------------------</pre>
</div>
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