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Simon Marchi 7188ed02d2 Replace dwarf2_per_cu_data::cu backlink with per-objfile map
The dwarf2_per_cu_data type is going to become objfile-independent,
while the dwarf2_cu type will stay object-dependent.  This patch removes
the backlink from dwarf2_per_cu_data to dwarf2_cu, in favor of the
dwarf2_per_objfile::m_dwarf2_cus map.  It maps dwarf2_per_cu_data
objects to the corresponding dwarf2_cu objects for this objfile.  If a
CU has been read in in the context of this objfile, then an entry will
be present in the map.

The dwarf2_cu objects that are read in are currently kept in a linked
list rooted in the dwarf2_per_bfd.  Except that the dwarf2_cu objects
are not simply linked together, they are interleaved with their
corresponding dwarf2_per_cu_data objects.  So if we have CUs A and B
read in, the dwarf2_per_bfd::read_in_chain will point to a chain like
this (DPCD == dwarf2_per_cu_data, DC == dwarf2_cu):

 DPCD A -> DC A -> DPCD B -> DC B

Obviously, this can't stay as is, since a same CU can be read in for an
objfile but not read in for another objfile sharing the same BFD, and
the dwarf2_per_cu_data::cu link is removed.   This is all replaced by
the dwarf2_per_objfile::m_dwarf2_cus map.

gdb/ChangeLog:

	* dwarf2/read.h (struct dwarf2_cu): Forward-declare.
	(struct dwarf2_per_bfd) <free_cached_comp_units>: Remove,
	move to dwarf2_per_objfile.
	<read_in_chain>: Remove.
	(struct dwarf2_per_objfile) <get_cu, set_cu, remove_cu,
	remove_all_cus, age_comp_units>: New methods.
	<m_dwarf2_cus>: New member.
	(struct dwarf2_per_cu_data) <cu>: Remove.
	* dwarf2/read.c (struct dwarf2_cu) <read_in_chain>: Remove.
	(age_cached_comp_units, free_one_cached_comp_unit): Remove,
	moved to methods of dwarf2_per_objfile.
	(dwarf2_clear_marks): Remove.
	(dwarf2_queue_item::~dwarf2_queue_item): Update.
	(dwarf2_per_bfd::~dwarf2_per_bfd): Don't free dwarf2_cus.
	(dwarf2_per_bfd::free_cached_comp_units): Remove.
	(dwarf2_per_objfile::remove_all_cus): New.
	(class free_cached_comp_units) <~free_cached_comp_units>:
	Update.
	(load_cu): Update.
	(dw2_do_instantiate_symtab): Adjust.
	(fill_in_sig_entry_from_dwo_entry): Adjust.
	(cutu_reader::init_tu_and_read_dwo_dies): Update.
	(cutu_reader::cutu_reader): Likewise.
	(cutu_reader::keep): Use dwarf2_per_objfile::set_cu.
	(cutu_reader::cutu_reader): Use dwarf2_per_objfile::get_cu.
	(process_psymtab_comp_unit): Use dwarf2_per_objfile::remove_cu
	and dwarf2_per_objfile::age_comp_units.
	(load_partial_comp_unit): Update.
	(maybe_queue_comp_unit): Use dwarf2_per_objfile::get_cu.
	(process_queue): Likewise.
	(find_partial_die): Use dwarf2_per_objfile::get_cu instead of cu
	backlink.
	(dwarf2_read_addr_index): Likewise.
	(follow_die_offset): Likewise.
	(dwarf2_fetch_die_loc_sect_off): Likewise.
	(dwarf2_fetch_constant_bytes): Likewise.
	(dwarf2_fetch_die_type_sect_off): Likewise.
	(follow_die_sig_1): Likewise.
	(load_full_type_unit): Likewise.
	(read_signatured_type): Likewise.
	(dwarf2_cu::dwarf2_cu): Don't set cu field.
	(dwarf2_cu::~dwarf2_cu): Remove.
	(dwarf2_per_objfile::get_cu): New.
	(dwarf2_per_objfile::set_cu): New.
	(age_cached_comp_units): Rename to...
	(dwarf2_per_objfile::age_comp_units): ... this.  Adjust
	to std::unordered_map.
	(free_one_cached_comp_unit): Rename to...
	(dwarf2_per_objfile::remove_cu): ... this.  Adjust
	to std::unordered_map.
	(dwarf2_per_objfile::~dwarf2_per_objfile): New.
	(dwarf2_mark_helper): Use dwarf2_per_objfile::get_cu, expect
	a dwarf2_per_objfile in data.
	(dwarf2_mark): Pass dwarf2_per_objfile in data to htab_traverse.
	(dwarf2_clear_marks): Remove.

Change-Id: Ia33ac71c79b2de4710569008e22a6563a1505cde
2020-05-27 11:19:40 -04:00
bfd ld: Add --warn-textrel and obsolete --warn-shared-textrel 2020-05-27 04:54:10 -07:00
binutils ar many_files test 2020-05-23 14:56:07 +09:30
config Sync config with GCC 2020-05-16 06:07:12 -07:00
contrib contrib: Update dg-extract-results.* from gcc 2020-05-15 11:41:22 +01:00
cpu Replace "if (x) free (x)" with "free (x)", opcodes 2020-05-21 10:45:33 +09:30
elfcpp Add markers for 2.34 branch to the NEWS files and ChangeLogs. 2020-01-18 13:50:25 +00:00
etc texi2pod.pl: import support for @t{...} from gcc 2020-01-15 12:58:09 -05:00
gas gas: Adjust x86 tests for PECOFF 2020-05-26 14:18:08 -07:00
gdb Replace dwarf2_per_cu_data::cu backlink with per-objfile map 2020-05-27 11:19:40 -04:00
gdbserver Use construct_inferior_arguments which handles special chars 2020-05-25 11:40:00 -04:00
gdbsupport gdbsupport: Drop now unused function 'stringify_argv' 2020-05-25 11:40:35 -04:00
gnulib gdb: update gnulib import 2020-02-22 20:37:18 -05:00
gold PowerPC: downgrade FP mismatch error for shared libraries to a warning 2020-05-22 13:32:51 +09:30
gprof Replace "if (x) free (x)" with "free (x)", gprof 2020-05-21 10:45:33 +09:30
include ld: Add --warn-textrel and obsolete --warn-shared-textrel 2020-05-27 04:54:10 -07:00
intl Regen with blessed automake-1.15.1 2020-02-20 13:02:24 +10:30
ld ld: Add --warn-textrel and obsolete --warn-shared-textrel 2020-05-27 04:54:10 -07:00
libctf libctf: Mark bswap_identity_64 inline function as static. 2020-03-11 17:48:49 +10:30
libdecnumber
libiberty Sync config and libiberty with GCC 2020-05-12 18:37:03 -07:00
opcodes Fix extraction of signed constants in nios2 disassembler (again). 2020-05-26 23:23:03 -07:00
readline Fix compilation of Readline on mingw.org's MinGW 2019-12-23 16:28:32 +02:00
sim sim: ppc: netbsd: Sync signal names with NetBSD 9.99.49 2020-03-12 16:07:37 +01:00
texinfo
zlib Merge changes from GCC for the config/ directory 2020-02-19 17:51:24 +00:00
.cvsignore
.gitattributes
.gitignore Add profiling outputs to .gitignore 2019-12-26 06:54:58 +01:00
ar-lib
ChangeLog Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
compile
config-ml.in
config.guess Update top level config files with copies from the official repository. 2020-01-18 13:43:19 +00:00
config.rpath
config.sub Update top level config files with copies from the official repository. 2020-01-18 13:43:19 +00:00
configure Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
configure.ac Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
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 Move gdbserver to top level 2020-02-07 08:42:25 -07:00
Makefile.def Change gdbserver to use existing gdbsupport 2020-03-12 13:32:16 -06:00
Makefile.in Change gdbserver to use existing gdbsupport 2020-03-12 13:32:16 -06:00
Makefile.tpl
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am
README
README-maintainer-mode
setup.com
src-release.sh Move gdbserver to top level 2020-02-07 08:42:25 -07:00
symlink-tree
test-driver
ylwrap

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