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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 64-bit call site value immediate is truncated"
href="https://bugs.llvm.org/show_bug.cgi?id=43525">43525</a>
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<th>Summary</th>
<td>64-bit call site value immediate is truncated
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>DebugInfo
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.stenberg@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, keith.walker@arm.com, llvm-bugs@lists.llvm.org, paul_robinson@playstation.sony.com
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<p>
<div>
<pre>When compiling the following test program:
#include <stdint.h>
extern void foo(uint64_t);
int main() {
foo(UINT64_C(0x1122334455667788));
return 0;
}
using:
clang -O1 -g -Xclang -femit-debug-entry-values -c call.c
the call site value for the 64-bit parameter is truncated to 32 bits:
0x00000064: DW_TAG_GNU_call_site_parameter
DW_AT_location (DW_OP_reg5 RDI)
DW_AT_GNU_call_site_value (DW_OP_constu 0x55667788)
The truncation happens in collectCallSiteParameters():
if (auto ParamValue = TII->describeLoadedValue(*I)) {
if (ParamValue->first->isImm()) {
unsigned Val = ParamValue->first->getImm(); <---------------
DbgValueLoc DbgLocVal(ParamValue->second, Val);
finishCallSiteParam(DbgLocVal, Reg);
[...]
DbgValueLoc takes a int64_t immediate, so if I change Val to a int64_t, the
correct value is emitted:
0x00000064: DW_TAG_GNU_call_site_parameter
DW_AT_location (DW_OP_reg5 RDI)
DW_AT_GNU_call_site_value (DW_OP_constu
0x1122334455667788)</pre>
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