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af97b4161f
This patch partly reverts commit 8a6d42345
("Change representation of
psymbol to flush out accessors"); specifically, it changes
partial_symbol to no longer derive from general_symbol_info.
The basic problem here is that the bcache compares objects bitwise,
and this change made it less likely that the relevant fields in the
psymbol would be fully initialized. This could be seen by running a
test under valgrind on the Fedora-i686 buildbot.
I considered a simpler patch, namely just zeroing the psymbol's
"value" field in add_psymbol_to_bcache. However, it wasn't clear to
me that this memset could not then be optimized away by the compiler.
Regression tested by the buildbot. I think this should go in 8.3 as
well.
gdb/ChangeLog
2019-05-04 Tom Tromey <tom@tromey.com>
* psymtab.c (psymbol_name_matches, match_partial_symbol)
(lookup_partial_symbol, print_partial_symbols)
(recursively_search_psymtabs, sort_pst_symbols, psymbol_hash)
(psymbol_compare): Update.
(add_psymbol_to_bcache): Clear the entire psymbol.
(maintenance_check_psymtabs): Update.
* psympriv.h (struct partial_symbol): Don't derive from
general_symbol_info.
<obj_section, unrelocated_address, address,
set_unrelocated_address>: Update.
<ginfo>: New member.
* dwarf-index-write.c (write_psymbols, debug_names::insert)
(debug_names::write_psymbols): Update.
361 lines
12 KiB
C++
361 lines
12 KiB
C++
/* Private partial symbol table definitions.
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Copyright (C) 2009-2019 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef PSYMPRIV_H
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#define PSYMPRIV_H
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#include "psymtab.h"
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#include "objfiles.h"
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/* A partial_symbol records the name, domain, and address class of
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symbols whose types we have not parsed yet. For functions, it also
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contains their memory address, so we can find them from a PC value.
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Each partial_symbol sits in a partial_symtab, all of which are chained
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on a partial symtab list and which points to the corresponding
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normal symtab once the partial_symtab has been referenced. */
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/* This structure is space critical. See space comments at the top of
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symtab.h. */
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struct partial_symbol
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{
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/* Return the section for this partial symbol, or nullptr if no
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section has been set. */
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struct obj_section *obj_section (struct objfile *objfile) const
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{
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if (ginfo.section >= 0)
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return &objfile->sections[ginfo.section];
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return nullptr;
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}
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/* Return the unrelocated address of this partial symbol. */
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CORE_ADDR unrelocated_address () const
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{
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return ginfo.value.address;
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}
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/* Return the address of this partial symbol, relocated according to
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the offsets provided in OBJFILE. */
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CORE_ADDR address (const struct objfile *objfile) const
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{
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return (ginfo.value.address
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+ ANOFFSET (objfile->section_offsets, ginfo.section));
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}
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/* Set the address of this partial symbol. The address must be
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unrelocated. */
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void set_unrelocated_address (CORE_ADDR addr)
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{
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ginfo.value.address = addr;
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}
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/* Note that partial_symbol does not derive from general_symbol_info
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due to the bcache. See add_psymbol_to_bcache. */
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struct general_symbol_info ginfo;
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/* Name space code. */
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ENUM_BITFIELD(domain_enum_tag) domain : SYMBOL_DOMAIN_BITS;
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/* Address class (for info_symbols). Note that we don't allow
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synthetic "aclass" values here at present, simply because there's
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no need. */
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ENUM_BITFIELD(address_class) aclass : SYMBOL_ACLASS_BITS;
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};
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/* A convenience enum to give names to some constants used when
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searching psymtabs. This is internal to psymtab and should not be
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used elsewhere. */
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enum psymtab_search_status
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{
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PST_NOT_SEARCHED,
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PST_SEARCHED_AND_FOUND,
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PST_SEARCHED_AND_NOT_FOUND
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};
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/* Each source file that has not been fully read in is represented by
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a partial_symtab. This contains the information on where in the
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executable the debugging symbols for a specific file are, and a
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list of names of global symbols which are located in this file.
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They are all chained on partial symtab lists.
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Even after the source file has been read into a symtab, the
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partial_symtab remains around. They are allocated on an obstack,
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objfile_obstack. */
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struct partial_symtab
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{
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/* Return the raw low text address of this partial_symtab. */
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CORE_ADDR raw_text_low () const
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{
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return m_text_low;
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}
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/* Return the raw high text address of this partial_symtab. */
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CORE_ADDR raw_text_high () const
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{
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return m_text_high;
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}
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/* Return the relocated low text address of this partial_symtab. */
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CORE_ADDR text_low (struct objfile *objfile) const
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{
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return m_text_low + ANOFFSET (objfile->section_offsets,
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SECT_OFF_TEXT (objfile));
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}
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/* Return the relocated high text address of this partial_symtab. */
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CORE_ADDR text_high (struct objfile *objfile) const
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{
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return m_text_high + ANOFFSET (objfile->section_offsets,
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SECT_OFF_TEXT (objfile));
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}
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/* Set the low text address of this partial_symtab. */
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void set_text_low (CORE_ADDR addr)
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{
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m_text_low = addr;
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text_low_valid = 1;
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}
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/* Set the hight text address of this partial_symtab. */
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void set_text_high (CORE_ADDR addr)
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{
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m_text_high = addr;
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text_high_valid = 1;
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}
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/* Chain of all existing partial symtabs. */
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struct partial_symtab *next;
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/* Name of the source file which this partial_symtab defines,
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or if the psymtab is anonymous then a descriptive name for
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debugging purposes, or "". It must not be NULL. */
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const char *filename;
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/* Full path of the source file. NULL if not known. */
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char *fullname;
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/* Directory in which it was compiled, or NULL if we don't know. */
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const char *dirname;
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/* Range of text addresses covered by this file; texthigh is the
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beginning of the next section. Do not use if PSYMTABS_ADDRMAP_SUPPORTED
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is set. Do not refer directly to these fields. Instead, use the
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accessors. The validity of these fields is determined by the
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text_low_valid and text_high_valid fields; these are located later
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in this structure for better packing. */
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CORE_ADDR m_text_low;
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CORE_ADDR m_text_high;
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/* If NULL, this is an ordinary partial symbol table.
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If non-NULL, this holds a single includer of this partial symbol
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table, and this partial symbol table is a shared one.
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A shared psymtab is one that is referenced by multiple other
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psymtabs, and which conceptually has its contents directly
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included in those.
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Shared psymtabs have special semantics. When a search finds a
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symbol in a shared table, we instead return one of the non-shared
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tables that include this one.
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A shared psymtabs can be referred to by other shared ones.
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The psymtabs that refer to a shared psymtab will list the shared
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psymtab in their 'dependencies' array.
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In DWARF terms, a shared psymtab is a DW_TAG_partial_unit; but
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of course using a name based on that would be too confusing, so
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"shared" was chosen instead.
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Only a single user is needed because, when expanding a shared
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psymtab, we only need to expand its "canonical" non-shared user.
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The choice of which one should be canonical is left to the
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debuginfo reader; it can be arbitrary. */
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struct partial_symtab *user;
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/* Array of pointers to all of the partial_symtab's which this one
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depends on. Since this array can only be set to previous or
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the current (?) psymtab, this dependency tree is guaranteed not
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to have any loops. "depends on" means that symbols must be read
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for the dependencies before being read for this psymtab; this is
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for type references in stabs, where if foo.c includes foo.h, declarations
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in foo.h may use type numbers defined in foo.c. For other debugging
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formats there may be no need to use dependencies. */
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struct partial_symtab **dependencies;
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int number_of_dependencies;
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/* Global symbol list. This list will be sorted after readin to
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improve access. Binary search will be the usual method of
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finding a symbol within it. globals_offset is an integer offset
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within global_psymbols[]. */
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int globals_offset;
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int n_global_syms;
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/* Static symbol list. This list will *not* be sorted after readin;
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to find a symbol in it, exhaustive search must be used. This is
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reasonable because searches through this list will eventually
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lead to either the read in of a files symbols for real (assumed
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to take a *lot* of time; check) or an error (and we don't care
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how long errors take). This is an offset and size within
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static_psymbols[]. */
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int statics_offset;
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int n_static_syms;
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/* Non-zero if the symtab corresponding to this psymtab has been
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readin. This is located here so that this structure packs better
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on 64-bit systems. */
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unsigned char readin;
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/* True iff objfile->psymtabs_addrmap is properly populated for this
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partial_symtab. For discontiguous overlapping psymtabs is the only usable
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info in PSYMTABS_ADDRMAP. */
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unsigned char psymtabs_addrmap_supported;
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/* True if the name of this partial symtab is not a source file name. */
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unsigned char anonymous;
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/* A flag that is temporarily used when searching psymtabs. */
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ENUM_BITFIELD (psymtab_search_status) searched_flag : 2;
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/* Validity of the m_text_low and m_text_high fields. */
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unsigned int text_low_valid : 1;
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unsigned int text_high_valid : 1;
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/* Pointer to compunit eventually allocated for this source file, 0 if
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!readin or if we haven't looked for the symtab after it was readin. */
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struct compunit_symtab *compunit_symtab;
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/* Pointer to function which will read in the symtab corresponding to
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this psymtab. */
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void (*read_symtab) (struct partial_symtab *, struct objfile *);
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/* Information that lets read_symtab() locate the part of the symbol table
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that this psymtab corresponds to. This information is private to the
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format-dependent symbol reading routines. For further detail examine
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the various symbol reading modules. */
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void *read_symtab_private;
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};
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/* Specify whether a partial psymbol should be allocated on the global
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list or the static list. */
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enum class psymbol_placement
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{
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STATIC,
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GLOBAL
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};
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/* Add any kind of symbol to a partial_symbol vector. */
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extern void add_psymbol_to_list (const char *, int,
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int, domain_enum,
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enum address_class,
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short /* section */,
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enum psymbol_placement,
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CORE_ADDR,
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enum language, struct objfile *);
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/* Initialize storage for partial symbols. If partial symbol storage
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has already been initialized, this does nothing. TOTAL_SYMBOLS is
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an estimate of how many symbols there will be. */
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extern void init_psymbol_list (struct objfile *objfile, int total_symbols);
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extern struct partial_symtab *start_psymtab_common (struct objfile *,
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const char *, CORE_ADDR);
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extern void end_psymtab_common (struct objfile *, struct partial_symtab *);
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/* Allocate a new partial symbol table associated with OBJFILE.
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FILENAME (which must be non-NULL) is the filename of this partial
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symbol table; it is copied into the appropriate storage. A new
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partial symbol table is returned; aside from "next" and "filename",
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its fields are initialized to zero. */
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extern struct partial_symtab *allocate_psymtab (const char *filename,
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struct objfile *objfile)
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ATTRIBUTE_NONNULL (1);
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static inline void
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discard_psymtab (struct objfile *objfile, struct partial_symtab *pst)
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{
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objfile->partial_symtabs->discard_psymtab (pst);
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}
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/* Used when recording partial symbol tables. On destruction,
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discards any partial symbol tables that have been built. However,
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the tables can be kept by calling the "keep" method. */
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class psymtab_discarder
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{
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public:
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psymtab_discarder (struct objfile *objfile)
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: m_objfile (objfile),
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m_psymtab (objfile->partial_symtabs->psymtabs)
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{
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}
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~psymtab_discarder ()
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{
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if (m_objfile != NULL)
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m_objfile->partial_symtabs->discard_psymtabs_to (m_psymtab);
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}
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/* Keep any partial symbol tables that were built. */
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void keep ()
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{
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m_objfile = NULL;
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}
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private:
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/* The objfile. If NULL this serves as a sentinel to indicate that
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the psymtabs should be kept. */
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struct objfile *m_objfile;
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/* How far back to free. */
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struct partial_symtab *m_psymtab;
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};
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#endif /* PSYMPRIV_H */
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