https://llvm.org/bugs/show_bug.cgi?id=23260
Bug ID: 23260
Summary: DebugInfo: Wrong value for inlined formal_parameters
of a function inlined twice
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
$ cat t.c
void sink(void);
static __attribute__((always_inline)) void bar(int a) { sink(); }
void foo(void) {
bar(0);
bar(1);
}
$ clang -g -O2 t.c -S -emit-llvm -o - | grep llvm.dbg.value
tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !12, metadata
!17) #3, !dbg !18
tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !12, metadata
!17) #3, !dbg !21
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
Notice that both intrinsics get `i32 0`.
This happens during dead argument elimination.
*** IR Dump After Dead Argument Elimination ***; ModuleID = 't.c'
; Function Attrs: alwaysinline nounwind ssp uwtable
define internal fastcc void @bar() #1 {
entry:
call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !12, metadata !20),
!dbg !21
call void @sink(), !dbg !22
ret void, !dbg !23
}
I suspect the right solution is to lose the variable entirely.
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