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Tom de Vries 93e55f0a03 [gdb/symtab] Prefer var def over decl
Consider the DWARF as generated by gcc with the tentative patch to fix gcc
PR91507 - "wrong debug for completed array with previous incomplete
declaration":
...
 <1><f4>: Abbrev Number: 2 (DW_TAG_array_type)
    <f5>   DW_AT_type        : <0xff>
    <f9>   DW_AT_sibling     : <0xff>
 <2><fd>: Abbrev Number: 3 (DW_TAG_subrange_type)
 <2><fe>: Abbrev Number: 0
 <1><ff>: Abbrev Number: 4 (DW_TAG_pointer_type)
    <100>   DW_AT_byte_size   : 8
    <101>   DW_AT_type        : <0x105>
 <1><105>: Abbrev Number: 5 (DW_TAG_base_type)
    <106>   DW_AT_byte_size   : 1
    <107>   DW_AT_encoding    : 6       (signed char)
    <108>   DW_AT_name        : (indirect string, offset: 0x19f): char
 <1><10c>: Abbrev Number: 6 (DW_TAG_variable)
    <10d>   DW_AT_name        : zzz
    <111>   DW_AT_decl_file   : 1
    <112>   DW_AT_decl_line   : 1
    <113>   DW_AT_decl_column : 14
    <114>   DW_AT_type        : <0xf4>
    <118>   DW_AT_external    : 1
    <118>   DW_AT_declaration : 1
 <1><118>: Abbrev Number: 2 (DW_TAG_array_type)
    <119>   DW_AT_type        : <0xff>
    <11d>   DW_AT_sibling     : <0x128>
 <1><12f>: Abbrev Number: 8 (DW_TAG_variable)
    <130>   DW_AT_specification: <0x10c>
    <134>   DW_AT_decl_line   : 2
    <135>   DW_AT_decl_column : 7
    <136>   DW_AT_type        : <0x118>
    <13a>   DW_AT_location    : 9 byte block: 3 30 10 60 0 0 0 0 0      (DW_OP_addr: 601030)
...

The DWARF will result in two entries in the symbol table, a decl with type
char *[] and a def with type char*[2].

When trying to print the value of zzz:
...
$ gdb a.spec.out -batch -ex "p zzz"
...
the decl (rather than the def) will be found in the symbol table, which is
missing the location information, and consequently we get:
...
$1 = 0x601030 <zzz>
...

[ There is a fallback mechanism that finds the address of the variable in the
minimal symbol table, but that's not used here, because the type of the decl
does not specify a size.  We could use the symbol size here to get the size
of the type, but that's currently not done: PR exp/24989.  Still, fixing that
PR would not fix the generic case, where minimal symbol info is not
available. ]

Fix this by preferring defs over decls when searching in the symbol table.

Build and reg-tested on x86_64-linux.

gdb/ChangeLog:

2019-12-06  Tom de Vries  <tdevries@suse.de>

	PR symtab/24971
	* block.c (best_symbol, better_symbol): New function.
	(block_lookup_symbol_primary, block_lookup_symbol): Prefer def over
	decl.

gdb/testsuite/ChangeLog:

2019-12-06  Tom de Vries  <tdevries@suse.de>

	* gdb.dwarf2/varval.exp: Add decl before def test.

Change-Id: Id92326cb8ef9903b121ef9e320658eb565d0f5a9
2019-12-06 18:51:49 +01:00
bfd Automatic date update in version.in 2019-12-06 00:00:39 +00:00
binutils binutils/gas/riscv: Add DWARF register numbers for CSRs 2019-11-28 00:03:05 +00:00
config
contrib contrib: Update dg-extract-results.* from gcc 2019-10-21 15:26:48 +01:00
cpu cpu: fix comment in bpf.cpu 2019-11-20 10:16:24 +01:00
elfcpp
etc
gas [gas] Implement .cfi_negate_ra_state directive 2019-12-06 10:46:32 +00:00
gdb [gdb/symtab] Prefer var def over decl 2019-12-06 18:51:49 +01:00
gnulib Add no-dist to gnulib configure 2019-11-15 13:48:27 -07:00
gold Introduce new .text.sorted.* sections. 2019-11-26 17:20:10 +01:00
gprof Revert previous delta. 2019-11-15 11:52:50 +00:00
include Arm64: simplify Crypto arch extension handling 2019-12-05 08:44:22 +01:00
intl
ld Re: Only give FDE encoding warnings if --eh-frame-hdr was specified. 2019-12-06 17:59:13 +10:30
libctf libctf: mark swap.h inline functions as static 2019-10-16 11:12:23 -04:00
libdecnumber
libiberty
opcodes Arm64: simplify Crypto arch extension handling 2019-12-05 08:44:22 +01:00
readline Minor updates to readline configury 2019-11-15 13:46:54 -07:00
sim sim-utils.c: prevent buffer overflow. 2019-12-04 10:38:08 -07:00
texinfo
zlib
.cvsignore
.gitattributes
.gitignore
ar-lib
ChangeLog Add libctf to src-release.sh:GDB_SUPPORT_DIRS 2019-10-17 14:00:51 -04:00
compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
config-ml.in
config.guess
config.rpath
config.sub
configure
configure.ac
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def gdb: CTF support 2019-10-07 02:26:27 +00:00
Makefile.in gdb: CTF support 2019-10-07 02:26:27 +00:00
Makefile.tpl
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am
README
README-maintainer-mode
setup.com
src-release.sh Add libctf to src-release.sh:GDB_SUPPORT_DIRS 2019-10-17 14:00:51 -04:00
symlink-tree
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ylwrap

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