cmd/compile: missing variables in debug_info for inlined subroutines #24460
Description
go version devel +ae10914 Tue Mar 20 09:44:50 2018 +0000 linux/amd64
If I compile the following:
package main
import "fmt"
func inlineThis(a int) int {
z := a * a
return z + a/a
}
func initialize(a, b *int) {
*a = 3
*b = 4
}
func main() {
var a, b int
initialize(&a, &b)
a = inlineThis(a)
b = inlineThis(b)
fmt.Printf("%d %d\n", a, b)
}
with -gcflags='-N' the DIE for main.inlineThis is:
<1><63404>: Abbrev Number: 3 (DW_TAG_subprogram)
<63405> DW_AT_name : main.inlineThis
<63415> DW_AT_inline : 1 (inlined)
<63416> DW_AT_external : 1
<2><63417>: Abbrev Number: 0
which doesn't have any local variables/parameters and neither do the corresponding DW_TAG_inlined_subroutine entries.
while with 1.10 I got:
<1><649a0>: Abbrev Number: 3 (DW_TAG_subprogram)
<649a1> DW_AT_name : main.inlineThis
<649b1> DW_AT_inline : 1 (inlined)
<649b2> DW_AT_external : 1
<2><649b3>: Abbrev Number: 16 (DW_TAG_formal_parameter)
<649b4> DW_AT_name : a
<649b6> DW_AT_variable_parameter: 0
<649b7> DW_AT_type : <0x220d>
<2><649bb>: Abbrev Number: 11 (DW_TAG_variable)
<649bc> DW_AT_name : z
<649be> DW_AT_decl_line : 6
<649bf> DW_AT_type : <0x220d>
<2><649c3>: Abbrev Number: 0
Bisect says b3cb740 is the first bad commit. However that commit seems pretty tame, I'm not sure what's going on.
cc @heschik @thanm