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[Bug c++/79129] [7 Regression] ICE with -fdebug-types-section starting with r240578
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 18 Jan 2017 17:56:30 +0000
- Subject: [Bug c++/79129] [7 Regression] ICE with -fdebug-types-section starting with r240578
- Auto-submitted: auto-generated
- References: <bug-79129-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79129
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Adjusted testcase:
struct A { void foo (int &); };
struct B
{
A *bar ();
~B () { int a = 1; bar ()->foo (a); }
};
struct C { ~C (); B c; };
C::~C () {}
doesn't ICE.
On this testcase, the difference between print_die (comp_unit_die (), stderr)
before and after the break_out_comdat_types (comp_unit_die ()); call gives:
--- 1 2017-01-18 17:24:43.363049681 +0100
+++ 2 2017-01-18 17:25:03.509787874 +0100
@@ -4,12 +4,12 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_language: 4
DW_AT_name: "pr79129-2.C"
DW_AT_comp_dir: "/usr/src/gcc/obj/gcc"
- DIE 0: DW_TAG_structure_type (0x7fffefaea050)
+ DIE 0: DW_TAG_structure_type (0x7fffefaeaeb0)
abbrev id: 0 offset: 0 mark: 0
+ signature: 798cbb933baaec2c
DW_AT_name: "A"
- DW_AT_byte_size: 1
- DW_AT_decl_file: "pr79129-2.C" (0)
- DW_AT_decl_line: 1
+ DW_AT_signature: die -> signature: 798cbb933baaec2c (0x7fffefaea050)
+ DW_AT_declaration: 1
DIE 0: DW_TAG_subprogram (0x7fffefaea0a0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
@@ -18,18 +18,10 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_decl_line: 1
DW_AT_linkage_name: "_ZN1A3fooERi"
DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea0f0)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea0f0)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea140)
- DW_AT_artificial: 1
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea190)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea1e0)
DIE 0: DW_TAG_pointer_type (0x7fffefaea140)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
- DW_AT_type: die -> 0 (0x7fffefaea050)
+ DW_AT_type: die -> signature: 798cbb933baaec2c (0x7fffefaea050)
DIE 0: DW_TAG_reference_type (0x7fffefaea1e0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
@@ -42,12 +34,12 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DIE 0: DW_TAG_const_type (0x7fffefaeaa00)
abbrev id: 0 offset: 0 mark: 0
DW_AT_type: die -> 0 (0x7fffefaea230)
- DIE 0: DW_TAG_structure_type (0x7fffefaea280)
+ DIE 0: DW_TAG_structure_type (0x7fffefaeafa0)
abbrev id: 0 offset: 0 mark: 0
+ signature: a6d1580689de2b0b
DW_AT_name: "B"
- DW_AT_byte_size: 1
- DW_AT_decl_file: "pr79129-2.C" (0)
- DW_AT_decl_line: 2
+ DW_AT_signature: die -> signature: a6d1580689de2b0b (0x7fffefaea280)
+ DW_AT_declaration: 1
DIE 0: DW_TAG_subprogram (0x7fffefaea2d0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
@@ -57,11 +49,6 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_linkage_name: "_ZN1B3barEv"
DW_AT_type: die -> 0 (0x7fffefaea140)
DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea320)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea320)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea370)
- DW_AT_artificial: 1
DIE 0: DW_TAG_subprogram (0x7fffefaea3c0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
@@ -70,35 +57,19 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_decl_line: 5
DW_AT_linkage_name: "_ZN1BD4Ev"
DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea410)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea410)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea370)
- DW_AT_artificial: 1
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea460)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea230)
- DW_AT_artificial: 1
DIE 0: DW_TAG_pointer_type (0x7fffefaea370)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
- DW_AT_type: die -> 0 (0x7fffefaea280)
+ DW_AT_type: die -> signature: a6d1580689de2b0b (0x7fffefaea280)
DIE 0: DW_TAG_const_type (0x7fffefaeab90)
abbrev id: 0 offset: 0 mark: 0
DW_AT_type: die -> 0 (0x7fffefaea370)
- DIE 0: DW_TAG_structure_type (0x7fffefaea4b0)
+ DIE 0: DW_TAG_structure_type (0x7fffefc580f0)
abbrev id: 0 offset: 0 mark: 0
+ signature: ecf81ca311705bbd
DW_AT_name: "C"
- DW_AT_byte_size: 1
- DW_AT_decl_file: "pr79129-2.C" (0)
- DW_AT_decl_line: 7
- DIE 0: DW_TAG_member (0x7fffefaea500)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_name: "c"
- DW_AT_decl_file: "pr79129-2.C" (0)
- DW_AT_decl_line: 7
- DW_AT_type: die -> 0 (0x7fffefaea280)
- DW_AT_data_member_location: 0
+ DW_AT_signature: die -> signature: ecf81ca311705bbd (0x7fffefaea4b0)
+ DW_AT_declaration: 1
DIE 0: DW_TAG_subprogram (0x7fffefaea550)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
@@ -107,19 +78,10 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_decl_line: 7
DW_AT_linkage_name: "_ZN1CD4Ev"
DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea5a0)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea5a0)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea5f0)
- DW_AT_artificial: 1
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea640)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea230)
- DW_AT_artificial: 1
DIE 0: DW_TAG_pointer_type (0x7fffefaea5f0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
- DW_AT_type: die -> 0 (0x7fffefaea4b0)
+ DW_AT_type: die -> signature: ecf81ca311705bbd (0x7fffefaea4b0)
DIE 0: DW_TAG_const_type (0x7fffefaea960)
abbrev id: 0 offset: 0 mark: 0
DW_AT_type: die -> 0 (0x7fffefaea5f0)
(i.e. before pruning unused stuff) which looks reasonable to me, the three
DW_TAG_structure_type DIEs are moved into their own .debug_types units together
with copies of other needed DIEs, while all other DIEs that should stay stayed
in the CU, just those 3 DW_TAG_structure_type DIEs were moved were replaced
with copies. Just wonder what would happen if anything referred to the
DW_TAG_formal_parameter DIEs in the main CU, but as it is external, it is
unlikely. But with the #c0 testcase the diff is:
--- 3 2017-01-18 18:45:12.125590423 +0100
+++ 4 2017-01-18 18:45:32.779325191 +0100
@@ -4,34 +4,18 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_language: 4
DW_AT_name: "pr79129.C"
DW_AT_comp_dir: "/usr/src/gcc/obj/gcc"
- DIE 0: DW_TAG_structure_type (0x7fffefaea050)
+ DIE 0: DW_TAG_structure_type (0x7fffefc58050)
abbrev id: 0 offset: 0 mark: 0
+ signature: ce3fbc5d394db0b1
DW_AT_name: "B"
- DW_AT_byte_size: 1
- DW_AT_decl_file: "pr79129.C" (0)
- DW_AT_decl_line: 1
- DIE 0: DW_TAG_structure_type (0x7fffefaea0a0)
+ DW_AT_signature: die -> signature: ce3fbc5d394db0b1 (0x7fffefaea050)
+ DW_AT_declaration: 1
+ DIE 0: DW_TAG_structure_type (0x7fffefaeaf00)
abbrev id: 0 offset: 0 mark: 0
+ signature: 1e451c7e817570b9
DW_AT_name: "A"
- DW_AT_byte_size: 1
- DW_AT_decl_file: "pr79129.C" (0)
- DW_AT_decl_line: 3
- DIE 0: DW_TAG_subprogram (0x7fffefaea0f0)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_external: 1
- DW_AT_name: "foo"
- DW_AT_decl_file: "pr79129.C" (0)
- DW_AT_decl_line: 3
- DW_AT_linkage_name: "_ZN1B1A3fooERi"
- DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea140)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea140)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea190)
- DW_AT_artificial: 1
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea1e0)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea230)
+ DW_AT_declaration: 1
+ DW_AT_signature: die -> signature: 1e451c7e817570b9 (0x7fffefaea0a0)
DIE 0: DW_TAG_subprogram (0x7fffefaea2d0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
@@ -41,11 +25,6 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_linkage_name: "_ZN1B3barEv"
DW_AT_type: die -> 0 (0x7fffefaea190)
DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea320)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea320)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea370)
- DW_AT_artificial: 1
DIE 0: DW_TAG_subprogram (0x7fffefaea3c0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
@@ -54,19 +33,10 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_decl_line: 5
DW_AT_linkage_name: "_ZN1BD4Ev"
DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea410)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea410)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea370)
- DW_AT_artificial: 1
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea460)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea280)
- DW_AT_artificial: 1
DIE 0: DW_TAG_pointer_type (0x7fffefaea190)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
- DW_AT_type: die -> 0 (0x7fffefaea0a0)
+ DW_AT_type: die -> signature: 1e451c7e817570b9 (0x7fffefaea0a0)
DIE 0: DW_TAG_reference_type (0x7fffefaea230)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
@@ -82,23 +52,16 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DIE 0: DW_TAG_pointer_type (0x7fffefaea370)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
- DW_AT_type: die -> 0 (0x7fffefaea050)
+ DW_AT_type: die -> signature: ce3fbc5d394db0b1 (0x7fffefaea050)
DIE 0: DW_TAG_const_type (0x7fffefaeab90)
abbrev id: 0 offset: 0 mark: 0
DW_AT_type: die -> 0 (0x7fffefaea370)
- DIE 0: DW_TAG_structure_type (0x7fffefaea4b0)
+ DIE 0: DW_TAG_structure_type (0x7fffefc581e0)
abbrev id: 0 offset: 0 mark: 0
+ signature: 8f3220878371d9fb
DW_AT_name: "C"
- DW_AT_byte_size: 1
- DW_AT_decl_file: "pr79129.C" (0)
- DW_AT_decl_line: 7
- DIE 0: DW_TAG_member (0x7fffefaea500)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_name: "c"
- DW_AT_decl_file: "pr79129.C" (0)
- DW_AT_decl_line: 7
- DW_AT_type: die -> 0 (0x7fffefaea050)
- DW_AT_data_member_location: 0
+ DW_AT_signature: die -> signature: 8f3220878371d9fb (0x7fffefaea4b0)
+ DW_AT_declaration: 1
DIE 0: DW_TAG_subprogram (0x7fffefaea550)
abbrev id: 0 offset: 0 mark: 0
DW_AT_external: 1
@@ -107,19 +70,10 @@ DIE 0: DW_TAG_compile_unit (0x7fffefa
DW_AT_decl_line: 7
DW_AT_linkage_name: "_ZN1CD4Ev"
DW_AT_declaration: 1
- DW_AT_object_pointer: die -> 0 (0x7fffefaea5a0)
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea5a0)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea5f0)
- DW_AT_artificial: 1
- DIE 0: DW_TAG_formal_parameter (0x7fffefaea640)
- abbrev id: 0 offset: 0 mark: 0
- DW_AT_type: die -> 0 (0x7fffefaea280)
- DW_AT_artificial: 1
DIE 0: DW_TAG_pointer_type (0x7fffefaea5f0)
abbrev id: 0 offset: 0 mark: 0
DW_AT_byte_size: 8
- DW_AT_type: die -> 0 (0x7fffefaea4b0)
+ DW_AT_type: die -> signature: 8f3220878371d9fb (0x7fffefaea4b0)
DIE 0: DW_TAG_const_type (0x7fffefaea960)
abbrev id: 0 offset: 0 mark: 0
DW_AT_type: die -> 0 (0x7fffefaea5f0)
and as you can see, all the children of the DW_TAG_structure_type "A" were just
moved into the .debug_types unit, instead of copied.