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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug debug/107012] [debug, dwarf-5] Missing line information for evaluating macros Date: Fri, 23 Sep 2022 12:51:05 +0000 [thread overview] Message-ID: <bug-107012-4-YPsGXcl2WC@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-107012-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107012 --- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I don't see anything wrong on what GCC emits. If I compile with -O3 -g3 -gdwarf-4 -dA -nostdinc so that stdc-predef.h isn't included vs. -O3 -g3 -gdwarf-5 -dA -nostdinc, in .debug_macro I see for DWARF 4: .section .debug_macro,"",@progbits .Ldebug_macro0: .value 0x4 # DWARF macro version number .byte 0x2 # Flags: 32-bit, lineptr present .long .Ldebug_line0 .byte 0x7 # Import .long .Ldebug_macro2 .byte 0x3 # Start new file .byte 0 # uleb128 0; Included from line number 0 .byte 0x1 # uleb128 0x1; file pr107012.c .byte 0x5 # Define macro strp .byte 0x1 # uleb128 0x1; At line number 1 .long .LASF372 # The macro: "TEST_MACRO 42" .byte 0x4 # End file .byte 0 # End compilation unit where .Ldebug_macro2 is import of the predefined macros. .debug_line then has: .ascii "pr107012.c\0" # File Entry: 0x1 .byte 0 # uleb128 0 .byte 0 # uleb128 0 .byte 0 # uleb128 0 i.e. file entry 1 is pr107012.c. In DWARF 5 it is: .section .debug_macro,"",@progbits .Ldebug_macro0: .value 0x5 # DWARF macro version number .byte 0x2 # Flags: 32-bit, lineptr present .long .Ldebug_line0 .byte 0x7 # Import .long .Ldebug_macro2 .byte 0x3 # Start new file .byte 0 # uleb128 0; Included from line number 0 .byte 0x1 # uleb128 0x1; file pr107012.c .byte 0x5 # Define macro strp .byte 0x1 # uleb128 0x1; At line number 1 .long .LASF374 # The macro: "TEST_MACRO 42" .byte 0x4 # End file .byte 0 # End compilation unit so there are only minor differences related to macros: - .long .Ldebug_macro0 # DW_AT_GNU_macros + .long .Ldebug_macro0 # DW_AT_macros in .debug_info section and .section .debug_macro,"",@progbits .Ldebug_macro0: - .value 0x4 # DWARF macro version number + .value 0x5 # DWARF macro version number .byte 0x2 # Flags: 32-bit, lineptr present .long .Ldebug_line0 .byte 0x7 # Import ... .byte 0x1 # uleb128 0x1; file pr107012.c .byte 0x5 # Define macro strp .byte 0x1 # uleb128 0x1; At line number 1 - .long .LASF372 # The macro: "TEST_MACRO 42" + .long .LASF374 # The macro: "TEST_MACRO 42" .byte 0x4 # End file .byte 0 # End compilation unit in .debug_macro. The line table then says that both file 0 and 1 are pr107012.c: .byte 0x2 # File name entry format count .byte 0x1 # uleb128 0x1; DW_LNCT_path .byte 0x1f # uleb128 0x1f; DW_FORM_line_strp .byte 0x2 # uleb128 0x2; DW_LNCT_directory_index .byte 0xb # uleb128 0xb; DW_FORM_data1 .byte 0x2 # uleb128 0x2; File names count .long .LASF0 # File Entry: 0: "pr107012.c" .byte 0 .long .LASF0 # File Entry: 0: "pr107012.c" .byte 0 You'd better file this against gdb...
next prev parent reply other threads:[~2022-09-23 12:51 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-22 22:45 [Bug debug/107012] New: " gandalf at winds dot org 2022-09-22 22:46 ` [Bug debug/107012] " gandalf at winds dot org 2022-09-23 12:51 ` jakub at gcc dot gnu.org [this message] 2022-10-26 11:37 ` pinskia at gcc dot gnu.org 2022-10-26 16:50 ` pinskia at gcc dot gnu.org
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