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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 - Some variables have no dwarf location when -fast-isel is disabled on thumb targets"
href="https://bugs.llvm.org/show_bug.cgi?id=33044">33044</a>
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<th>Summary</th>
<td>Some variables have no dwarf location when -fast-isel is disabled on thumb targets
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</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>
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<th>Component</th>
<td>DebugInfo
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<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>To reproduce:
=== Objective-C Testcase ===
@class NSString;
void foo()
{
NSString* t = @"foo";
NSString* s = @"bar";
}
===========================
Compile with:
clang -cc1 -triple thumbv7-apple-ios9.0 -debug-info-kind=limited
-fsanitize=address -fobjc-arc -fobjc-runtime=ios -mllvm -fast-isel=0 test.m
-emit-obj -o test.o
clang -cc1 -triple thumbv7-apple-ios9.0 -debug-info-kind=limited
-fsanitize=address -fobjc-arc -fobjc-runtime=ios -mllvm -fast-isel=1 test.m
-emit-obj -o test.fast-isel.o
Compare dwarf for variable "s":
llvm-dwarfdump test.o:
0x00000048: DW_TAG_variable [4]
DW_AT_name [DW_FORM_strp] ( .debug_str[0x000000e1] = "s")
DW_AT_decl_file [DW_FORM_data1] ("test.m")
DW_AT_decl_line [DW_FORM_data1] (6)
DW_AT_type [DW_FORM_ref4] (cu + 0x0054 => {0x00000054})
llvm-dwarfdump test.fast-isel.o:
0x00000048: DW_TAG_variable [3]
DW_AT_location [DW_FORM_sec_offset] (0x00000021)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x000000e1] = "s")
DW_AT_decl_file [DW_FORM_data1] ("test.m")
DW_AT_decl_line [DW_FORM_data1] (6)
DW_AT_type [DW_FORM_ref4] (cu + 0x0058 => {0x00000058})
0x00000021: Beginning address offset: 0x00000000000000b8
Ending address offset: 0x00000000000000c2
Location description: 75 00
Beginning address offset: 0x00000000000000c2
Ending address offset: 0x00000000000001a6
Location description: 76 28 06</pre>
</div>
</p>
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