https://bugs.llvm.org/show_bug.cgi?id=43525
Bug ID: 43525
Summary: 64-bit call site value immediate is truncated
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: DebugInfo
Assignee: unassignedb...@nondot.org
Reporter: david.stenb...@ericsson.com
CC: jdevliegh...@apple.com, keith.wal...@arm.com,
llvm-bugs@lists.llvm.org,
paul_robin...@playstation.sony.com
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)
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