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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [DebugInfo] Lifetime of function arguments is too short in optimized code."
href="https://bugs.llvm.org/show_bug.cgi?id=39715">39715</a>
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<th>Summary</th>
<td>[DebugInfo] Lifetime of function arguments is too short in optimized code.
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>DebugInfo
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>davide@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>aprantl@apple.com, friss@apple.com, jdevlieghere@apple.com, keith.walker@arm.com, llvm-bugs@lists.llvm.org, rnk@google.com, vk@vedantk.com, vsk@apple.com, zturner@google.com
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<p>
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<pre>Same test case as before:
__attribute__((noinline))
int fn1 (long int x, long int y, long int z) {
int l = x * 2;
int q = y * z;
return l + q;
}
__attribute__((noinline)) long int
fn2 (long int a, long int b, long int c)
{
long int q = 2 * a;
return fn1 (5, 6, 7);
}
int main(void) {
return fn2(14, 23, 34);
}
(built with -O3 -g).
lldb session:
Process 30254 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step in
frame #0: 0x0000000100000f74 a.out`fn1(x=5, y=6, z=7) at optout.c:4:19
[opt]
1 __attribute__((noinline))
2 int fn1 (long int x, long int y, long int z) {
3 int l = x * 2;
-> 4 int q = y * z;
5 return l + q;
6 }
7
(lldb) frame var z
(long) z = 7
(lldb) n
Process 30254 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step over
frame #0: 0x0000000100000f77 a.out`fn1(x=5, y=6, z=<unavailable>) at
optout.c:5:18 [opt]
2 int fn1 (long int x, long int y, long int z) {
3 int l = x * 2;
4 int q = y * z;
-> 5 return l + q;
6 }
7
8 __attribute__((noinline)) long int
(lldb) frame var z
(long) z = <variable not available></pre>
</div>
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