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<p>Including Paul and llvm-dev.<br>
</p>
<div class="moz-cite-prefix">On 8/27/18 12:31 PM, Victor Leschuk
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ee600c3a-1f2f-f5cc-80a2-f9a397295cd7@accesssoftek.com">
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<p>David, Adrian, could you please advise on this one?<br>
</p>
<div class="moz-cite-prefix">On 8/27/18 12:24 PM, via llvm-bugs
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:bug-38714-206@http.bugs.llvm.org%2F">
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charset=UTF-8">
<base href="https://bugs.llvm.org/">
<table cellspacing="0" cellpadding="8" border="1">
<tbody>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link 
 bz_status_NEW " title="NEW
-
 [DebugInfo] [DWARF] [AArch64] .debug_loc entry
missing
 in optimized build on aarch64"
href="https://bugs.llvm.org/show_bug.cgi?id=38714"
moz-do-not-send="true">38714</a> </td>
</tr>
<tr>
<th>Summary</th>
<td>[DebugInfo] [DWARF] [AArch64] .debug_loc entry missing
in optimized build on aarch64 </td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs </td>
</tr>
<tr>
<th>Version</th>
<td>trunk </td>
</tr>
<tr>
<th>Hardware</th>
<td>PC </td>
</tr>
<tr>
<th>OS</th>
<td>Linux </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><a class="moz-txt-link-abbreviated"
href="mailto:unassignedbugs@nondot.org"
moz-do-not-send="true">unassignedbugs@nondot.org</a> </td>
</tr>
<tr>
<th>Reporter</th>
<td><a class="moz-txt-link-abbreviated"
href="mailto:vleschuk@accesssoftek.com"
moz-do-not-send="true">vleschuk@accesssoftek.com</a> </td>
</tr>
<tr>
<th>CC</th>
<td><a class="moz-txt-link-abbreviated"
href="mailto:llvm-bugs@lists.llvm.org"
moz-do-not-send="true">llvm-bugs@lists.llvm.org</a> </td>
</tr>
</tbody>
</table>
<p> </p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20771" name="attach_20771" title="Source, object file and generated assembly." moz-do-not-send="true">attachment 20771</a> <a href="attachment.cgi?id=20771&action=edit" title="Source, object file and generated assembly." moz-do-not-send="true">[details]</a></span>
Source, object file and generated assembly.
When compiling the following sample with optimizations enabled (-O1 and higher)
it looks like a .debug_loc entry is missing for argc:
#include <stdio.h>
int main( int argc, char **argv )
{
for(int i = 1; i < argc; ++i) {
printf("Argument %d: %s\n", i, argv[i]);
}
return 0;
}
$ clang -target aarch64-unknown-linux -c -g -O1 -o test.o test.c
There are the following entries:
0x00000043: DW_TAG_formal_parameter [3]
DW_AT_location [DW_FORM_sec_offset] (0x00000000
[0x0000000000000000, 0x0000000000000034): DW_OP_reg0 W0)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x000000d5] =
"argc")
0x00000052: DW_TAG_formal_parameter [3]
DW_AT_location [DW_FORM_sec_offset] (0x00000023
[0x0000000000000000, 0x0000000000000020): DW_OP_reg1 W1
[0x0000000000000020, 0x0000000000000048): DW_OP_reg19
W19)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x000000da] =
"argv")
The assembly for the code is the following:
//DEBUG_VALUE: main:argc <- $w0
//DEBUG_VALUE: main:argv <- $x1
.Ltmp0:
//DEBUG_VALUE: i <- 1
.loc 1 5 3 prologue_end // test.c:5:3
cmp w0, #2 // =2
b.lt .LBB0_3
.Ltmp1:
// %bb.1: // %for.body.preheader
//DEBUG_VALUE: main:argv <- $x1
//DEBUG_VALUE: main:argc <- $w0
.loc 1 0 3 is_stmt 0 // test.c:0:3
adrp x21, .L.str
mov x19, x1
.Ltmp2:
//DEBUG_VALUE: main:argv <- $x19
mov w22, w0
It looks like there should be two DW_OP_reg* records for w0 and for w22 for
argc.
Correct me if I am wrong.
PS x86 doesn't seem to have this problem.</pre>
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</blockquote>
<pre class="moz-signature" cols="72">--
Best Regards,
Victor Leschuk | Software Engineer | Access Softek</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Best Regards,
Victor Leschuk | Software Engineer | Access Softek</pre>
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