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Simon Marchi 2e6a9f7959 Add comp_unit_head to dwarf2_per_cu_data
The per_cu_header_read_in function allows obtaining a filled
comp_unit_head object for a given dwarf2_per_cu_data object.  If a
dwarf2_cu object exists for this dwarf2_per_cu_data, then it just
returns a pointer to the comp_unit_head from that dwarf2_cu.  Otherwise,
it reads the header into a temporary buffer provided by the caller, and
returns a pointer to that.

Since the dwarf2_per_cu_data::cu link is going to be removed
(dwarf2_per_cu_data will become objfile-independent while dwarf2_cu
stays objfile-dependent), we cannot rely anymore on returning the header
from the dwarf2_cu object.

The not too complex solution implemented by this patch is to keep a copy
of the header in the dwarf2_per_cu_data object, independent from the
copy in dwarf2_cu.  The new copy is only used in the addr_size,
offset_size and ref_addr_size methods of dwarf2_per_cu_data.

There's nothing intrinsic to the comp_unit_head object that prevents it
to be shared between two dwarf2_cu objects (belonging to different
objfiles) representing the same CU.  In other words, I think we could
eventually get rid of the copy in dwarf2_cu to only keep the one in
dwarf2_per_cu_data.  It is not trivial, however, so I have decided not
to do it for the moment.

gdb/ChangeLog:

	* dwarf2/read.h (struct dwarf2_per_cu_data) <m_header,
	m_header_read_in>: New fields.
	<get_header>: New method.
	* dwarf2/read.c (per_cu_header_read_in): Remove.
	(dwarf2_per_cu_data::get_header): New.
	(dwarf2_per_cu_data::addr_size): Update.
	(dwarf2_per_cu_data::offset_size): Update.
	(dwarf2_per_cu_data::ref_addr_size): Update.

Change-Id: Id7541fca7562843eba110ece21c4df38d45fca23
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
etc
gas gas: Adjust x86 tests for PECOFF 2020-05-26 14:18:08 -07:00
gdb Add comp_unit_head to dwarf2_per_cu_data 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
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
ld ld: Add --warn-textrel and obsolete --warn-shared-textrel 2020-05-27 04:54:10 -07:00
libctf
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
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
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If you are receiving this as part of a GDB release, see the file gdb/README.
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	./configure 
	make

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then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
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also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

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the Free Software Foundation, Inc.  See the file COPYING or
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