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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 - -fsanitize=null instrumentation causes assertion failure with release-mode arc"
href="https://bugs.llvm.org/show_bug.cgi?id=35059">35059</a>
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<th>Summary</th>
<td>-fsanitize=null instrumentation causes assertion failure with release-mode arc
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Transformation Utilities
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>francisjricci@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ cat /tmp/reduced.m
typedef struct { void *a; } bar;
void foo(bar *ptr) {
void *block;
void (^b)(void *result) = (__bridge void (^)(void *result))block;
void *val = ptr->a;
}
$ clang -cc1 -triple x86_64-apple-darwin -emit-obj -O1 -fsanitize=null -fblocks
-fobjc-arc -o /tmp/reduced.o -x objective-c /tmp/reduced.m
clang: llvm/lib/Transforms/ObjCARC/ObjCARC.h:62: void
llvm::objcarc::EraseInstruction(llvm::Instruction*): Assertion
`(IsForwarding(GetBasicARCInstKind(CI)) ||
(IsNoopOnNull(GetBasicARCInstKind(CI)) && isa<ConstantPointerNull>(OldArg))) &&
"Can't delete non-forwarding instruction with users!"' failed.
Note that if `void *block` is initialized to 0, the assertion failure goes
away.
The assertion does not repro with -O0, or with casts to more generic types (ie
a cast to a forward-declared @class instead of a cast to a block).</pre>
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