https://bugs.llvm.org/show_bug.cgi?id=47628
Bug ID: 47628
Summary: Incorrect entry value debug location after parameter
modification
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
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
LLVM commit: 310af42ed9ab259ad05ed46d459203b3473ba66e
When compiling the following file:
extern void bar(int);
extern int side_effect, value;
int foo(int param) {
side_effect = param;
param = value;
bar(param);
return 0;
}
using:
$ clang -O1 -g entry-value.c -S
we get entry value DEBUG_VALUEs for `param' even after the parameter has been
modified:
.cfi_startproc
# %bb.0: # %entry
#DEBUG_VALUE: foo:param <- $edi
#DEBUG_VALUE: foo:param <- $edi
pushq %rax
.cfi_def_cfa_offset 16
.Ltmp0:
.loc 1 5 15 prologue_end # entry-value.c:5:15
movl %edi, side_effect(%rip)
.loc 1 6 11 # entry-value.c:6:11
movl value(%rip), %edi
.Ltmp1:
#DEBUG_VALUE: foo:param <- [DW_OP_LLVM_entry_value 1] $edi
#DEBUG_VALUE: foo:param <- $edi
.loc 1 7 3 # entry-value.c:7:3
callq bar
.Ltmp2:
#DEBUG_VALUE: foo:param <- [DW_OP_LLVM_entry_value 1] $edi
.loc 1 8 3 # entry-value.c:8:3
xorl %eax, %eax
popq %rcx
.cfi_def_cfa_offset 8
retq
This means that the parameter will be printed incorrectly (given that there is
a call site value for the parameter in the caller of `foo').
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
