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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 --- - Stack Unwinding Protocol Broken by Ignoring Non-return Definitions"
href="http://llvm.org/bugs/show_bug.cgi?id=17825">17825</a>
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<th>Summary</th>
<td>Stack Unwinding Protocol Broken by Ignoring Non-return Definitions
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</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>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>zhaoshiz@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, qcolombet@apple.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11492" name="attach_11492" title="Simple Test Case">attachment 11492</a> <a href="attachment.cgi?id=11492&action=edit" title="Simple Test Case">[details]</a></span>
Simple Test Case
The following patch prevents setting LR as used PhysReg so 'push {r11, lr}' is
not generated in PEI, eventually ruining runtime stack with certain flag
combination:
-mllvm -arm-enable-ehabi -mllvm -arm-enable-ehabi-descriptors
-fomit-frame-pointer -mllvm -inline-threshold=20
Runtime behavior: test case program never finishes.
<span class="quote">> clang++ -target arm-none-linux-gnueabi -mfloat-abi=softfp -mfpu=neon --sysroot=~/build_tools/gcc-4.6.1-cs/arm-2011.09 -mcpu=cortex-a9 -Os -mthumb -static -trigraphs -fexceptions -fcxx-exceptions ./test.cpp -o test.exe -mllvm -arm-enable-ehabi -mllvm -arm-enable-ehabi-descriptors -fomit-frame-pointer -mllvm -inline-threshold=20</span >
Problematic function (missing instructions noted by ">"):
_ZN1SD1Ev:
.fnstart
.Leh_func_begin2:
<span class="quote">> .save {r11, lr}
> push.w {r11, lr}</span >
bl _ZN1SD2Ev
.Ltmp8:
.size _ZN1SD1Ev, .Ltmp8-_ZN1SD1Ev
.Leh_func_end2:
.fnend
commit ce734f1f43b3c5f614b95b53e3ed86f65daca8dd
Author: Quentin Colombet <<a href="mailto:qcolombet@apple.com">qcolombet@apple.com</a>>
Date: Wed Sep 25 00:26:17 2013 +0000
[PR16882] Ignore noreturn definitions when setting isPhysRegUsed.</pre>
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