llvm dev - Feb 2012 - [LLVMdev] DW_AT_inline not present in assembly for an inlined inline function

Hello

I am trying to run following test case on Clang compiled output to compare
the dwarf inline attributes in the resulting assembly output .

/* Inlined inline function must have abstract DIE  */
/* { dg-do compile } */
/* { dg-options "-O2 -gdwarf-2 -dA -fpreprocessed" } */
/* { dg-final { scan-assembler "3.*DW_AT_inline" } } */
#1 "test.h"
inline int t()
{
}
int q()
{
  t();
}

The testcase fails because, DW_AT_inline is not present in assembly output.
Could anyone let me know why DW_AT_inline is not emitted with Clang
compiled assembly output?
I am aware that Clang uses C99 mode by default.

In case of GCC,
.uleb128 0x2    @ (DIE (0x25) DW_TAG_subprogram)
        .byte   0x1     @ DW_AT_external
        .ascii "t\0"    @ DW_AT_name
        .byte   0x1     @ DW_AT_decl_file (test.h)
        .byte   0x1     @ DW_AT_decl_line
        .4byte  0x30    @ DW_AT_type
        .byte   0x3     @ DW_AT_inline

In case of Clang,
.byte   4                       @ Abbrev [4] 0x87:0xa DW_TAG_subprogram
        .byte   116                     @ DW_AT_name
        .byte   0
        .byte   2                       @ DW_AT_decl_file
        .byte   2                       @ DW_AT_decl_line
        .long   128                     @ DW_AT_type
        .byte   1                       @ DW_AT_external
        .byte   0                       @ End Of Children Mark

Is this a bug in LLVM ?
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On Feb 24, 2012, at 6:17 AM, anonymous wrote:
> Hello
> 
> I am trying to run following test case on Clang compiled output to compare
the dwarf inline attributes in the resulting assembly output .
> 
> /* Inlined inline function must have abstract DIE  */
> /* { dg-do compile } */
> /* { dg-options "-O2 -gdwarf-2 -dA -fpreprocessed" } */
> /* { dg-final { scan-assembler "3.*DW_AT_inline" } } */
> #1 "test.h"
> inline int t()
> {
> }
> int q()
> {
>   t();
> }
> 
> The testcase fails because, DW_AT_inline is not present in assembly output.
Could anyone let me know why DW_AT_inline is not emitted with Clang compiled
assembly output?
> I am aware that Clang uses C99 mode by default.
> 
> In case of GCC, 
> .uleb128 0x2    @ (DIE (0x25) DW_TAG_subprogram)
>         .byte   0x1     @ DW_AT_external
>         .ascii "t\0"    @ DW_AT_name
>         .byte   0x1     @ DW_AT_decl_file (test.h)
>         .byte   0x1     @ DW_AT_decl_line
>         .4byte  0x30    @ DW_AT_type
>         .byte   0x3     @ DW_AT_inline
> 
> In case of Clang,
> .byte   4                       @ Abbrev [4] 0x87:0xa DW_TAG_subprogram
>         .byte   116                     @ DW_AT_name
>         .byte   0
>         .byte   2                       @ DW_AT_decl_file
>         .byte   2                       @ DW_AT_decl_line
>         .long   128                     @ DW_AT_type
>         .byte   1                       @ DW_AT_external
>         .byte   0                       @ End Of Children Mark
> 
> Is this a bug in LLVM ?
Weird and yes. If you could file a bug and cc echristo at gmail.com I'd
appreciate it.

Thanks!

-eric

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