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0b398cf8f3
This changes the DIE range map from a raw addrmap to a custom class. A new type is used to represent the ranges, in an attempt to gain a little type safety as well. Note that the new code includes a map-of-maps type. This is not used yet, but will be used in the next patch. Co-Authored-By: Tom de Vries <tdevries@suse.de>
133 lines
3.9 KiB
C++
133 lines
3.9 KiB
C++
/* DIE indexing
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Copyright (C) 2024 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 GDB_DWARF2_PARENT_MAP_H
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#define GDB_DWARF2_PARENT_MAP_H
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#include <algorithm>
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class cooked_index_entry;
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/* A class that handles mapping from a DIE range to a parent
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entry.
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The generated DWARF can sometimes have the declaration for a method
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in a class (or perhaps namespace) scope, with the definition
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appearing outside this scope... just one of the many bad things
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about DWARF. In order to handle this situation, we defer certain
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entries until the end of scanning, at which point we'll know the
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containing context of all the DIEs that we might have scanned. */
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class parent_map
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{
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public:
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parent_map () = default;
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~parent_map () = default;
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/* Move only. */
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DISABLE_COPY_AND_ASSIGN (parent_map);
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parent_map (parent_map &&) = default;
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parent_map &operator= (parent_map &&) = default;
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/* A reasonably opaque type that is used here to combine a section
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offset and the 'dwz' flag into a single value. */
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enum addr_type : CORE_ADDR { };
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/* Turn a section offset into a value that can be used in a parent
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map. */
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static addr_type form_addr (sect_offset offset, bool is_dwz)
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{
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CORE_ADDR value = to_underlying (offset);
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if (is_dwz)
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value |= ((CORE_ADDR) 1) << (8 * sizeof (CORE_ADDR) - 1);
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return addr_type (value);
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}
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/* Add a new entry to this map. DIEs from START to END, inclusive,
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are mapped to PARENT. */
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void add_entry (addr_type start, addr_type end,
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const cooked_index_entry *parent)
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{
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gdb_assert (parent != nullptr);
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m_map.set_empty (start, end, (void *) parent);
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}
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/* Look up an entry in this map. */
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const cooked_index_entry *find (addr_type search) const
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{
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return static_cast<const cooked_index_entry *> (m_map.find (search));
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}
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/* Return a fixed addrmap that is equivalent to this map. */
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addrmap_fixed *to_fixed (struct obstack *obstack) const
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{
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return new (obstack) addrmap_fixed (obstack, &m_map);
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}
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private:
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/* An addrmap that maps from section offsets to cooked_index_entry *. */
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addrmap_mutable m_map;
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};
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/* Keep a collection of parent_map objects, and allow for lookups
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across all of them. */
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class parent_map_map
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{
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public:
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parent_map_map () = default;
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~parent_map_map () = default;
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DISABLE_COPY_AND_ASSIGN (parent_map_map);
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/* Add a parent_map to this map. */
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void add_map (const parent_map &map)
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{
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m_maps.push_back (map.to_fixed (&m_storage));
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}
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/* Look up an entry in this map. */
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const cooked_index_entry *find (parent_map::addr_type search) const
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{
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for (const auto &iter : m_maps)
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{
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const cooked_index_entry *result
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= static_cast<const cooked_index_entry *> (iter->find (search));
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if (result != nullptr)
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return result;
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}
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return nullptr;
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}
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private:
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/* Storage for the convert maps. */
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auto_obstack m_storage;
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/* While conceptually this class is a combination of parent_maps, in
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practice it is just a number of fixed maps. This is important
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because we want to allow concurrent lookups, but a mutable
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addrmap is based on a splay-tree, which is not thread-safe, even
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for nominally read-only lookups. */
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std::vector<addrmap_fixed *> m_maps;
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};
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#endif /* GDB_DWARF2_PARENT_MAP_H */
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