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[review v3] gdb: recognize new DWARF attributes: defaulted, deleted, calling conv.
- From: "Tankut Baris Aktemur (Code Review)" <gerrit at gnutoolchain-gerrit dot osci dot io>
- To: gdb-patches at sourceware dot org
- Cc: Simon Marchi <simon dot marchi at polymtl dot ca>, Tom Tromey <tromey at sourceware dot org>, Andrew Burgess <andrew dot burgess at embecosm dot com>
- Date: Thu, 31 Oct 2019 16:12:56 -0400
- Subject: [review v3] gdb: recognize new DWARF attributes: defaulted, deleted, calling conv.
- Auto-submitted: auto-generated
- References: <gerrit.1571406803000.I54192f363115b78ec7435a8563b73fcace420765@gnutoolchain-gerrit.osci.io>
- Reply-to: gnutoolchain-gerrit at osci dot io
Tankut Baris Aktemur has posted comments on this change.
Change URL: https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/135
......................................................................
Patch Set 3:
(3 comments)
https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/135/2/gdb/dwarf2read.c
File gdb/dwarf2read.c:
https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/135/2/gdb/dwarf2read.c@15831
PS2, Line 15831:
15822 | is_valid_DW_AT_calling_convention (ULONGEST value)
| ...
15826 | case DW_CC_normal:
15827 | case DW_CC_program:
15828 | case DW_CC_nocall:
15829 | case DW_CC_pass_by_reference:
15830 | case DW_CC_pass_by_value:
15831 > case DW_CC_lo_user:
15832 > case DW_CC_hi_user:
15833 | /* case DW_CC_GNU_renesas_sh: Duplicate of DW_CC_lo_user. */
15834 | case DW_CC_GNU_borland_fastcall_i386:
15835 | /* case DW_CC_GDB_IBM_OpenCL: Duplicate of DW_CC_hi_user. */
15836 | return true;
15837 | }
> I don' think we should include lo_user and hi_user in the switch, since they are not "real" values. […]
Ack
https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/135/2/gdb/dwarf2read.c@15928
PS2, Line 15928:
15857 | read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
| ...
15923 | TYPE_DECLARED_CLASS (type) = 1;
15924 |
15925 | /* Store the calling convention in the type if it's available in
15926 | the die. Otherwise the calling convention remains set to
15927 | the default value DW_CC_normal. */
15928 > attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
15929 | if (attr != nullptr
15930 | && is_valid_DW_AT_calling_convention (DW_UNSND (attr)))
15931 | {
15932 | ALLOCATE_CPLUS_STRUCT_TYPE (type);
15933 | TYPE_CPLUS_CALLING_CONVENTION (type)
> According to table 5. […]
Yes, makes much sense.
https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/135/3/gdb/dwarf2read.c
File gdb/dwarf2read.c:
https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/135/3/gdb/dwarf2read.c@15452
PS3, Line 15452:
15444 | is_valid_DW_AT_defaulted (ULONGEST value)
| ...
15447 | {
15448 | case DW_DEFAULTED_no:
15449 | case DW_DEFAULTED_in_class:
15450 | case DW_DEFAULTED_out_of_class:
15451 | return true;
15452 > }
15453 |
15454 | complaint (_("unrecognized DW_AT_defaulted value (%lu)"), value);
15455 | return false;
15456 | }
15457 |
I did not put a "default" case here whereas in 'is_valid_DW_AT_calling_convention_for_type' there is one. This is intentional. In case a new enum constant is added to 'dwarf_defaulted_attribute', a friendly compiler may warn about an uncaught case here. This was not possible in 'is_valid_DW_AT_calling_convention_for_type' as some values are already not valid.
--
Gerrit-Project: binutils-gdb
Gerrit-Branch: master
Gerrit-Change-Id: I54192f363115b78ec7435a8563b73fcace420765
Gerrit-Change-Number: 135
Gerrit-PatchSet: 3
Gerrit-Owner: Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
Gerrit-Reviewer: Andrew Burgess <andrew.burgess@embecosm.com>
Gerrit-Reviewer: Simon Marchi <simon.marchi@polymtl.ca>
Gerrit-Reviewer: Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
Gerrit-CC: Tom Tromey <tromey@sourceware.org>
Gerrit-Comment-Date: Thu, 31 Oct 2019 20:12:56 +0000
Gerrit-HasComments: Yes
Gerrit-Has-Labels: No
Comment-In-Reply-To: Simon Marchi <simon.marchi@polymtl.ca>
Gerrit-MessageType: comment