dwarf2/loc.c \
dwarf2/macro.c \
dwarf2/read.c \
+ dwarf2/read-gdb-index.c \
dwarf2/section.c \
dwarf2/stringify.c \
eval.c \
dwarf2/index-common.h \
dwarf2/loc.h \
dwarf2/read.h \
+ dwarf2/read-gdb-index.h \
event-top.h \
exceptions.h \
exec.h \
--- /dev/null
+/* Reading code for .gdb_index
+
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "read-gdb-index.h"
+
+#include "cli/cli-cmds.h"
+#include "complaints.h"
+#include "dwz.h"
+#include "gdb/gdb-index.h"
+#include "gdbsupport/gdb-checked-static-cast.h"
+#include "mapped-index.h"
+#include "read.h"
+
+/* When true, do not reject deprecated .gdb_index sections. */
+static bool use_deprecated_index_sections = false;
+
+/* This is a view into the index that converts from bytes to an
+ offset_type, and allows indexing. Unaligned bytes are specifically
+ allowed here, and handled via unpacking. */
+
+class offset_view
+{
+public:
+ offset_view () = default;
+
+ explicit offset_view (gdb::array_view<const gdb_byte> bytes)
+ : m_bytes (bytes)
+ {
+ }
+
+ /* Extract the INDEXth offset_type from the array. */
+ offset_type operator[] (size_t index) const
+ {
+ const gdb_byte *bytes = &m_bytes[index * sizeof (offset_type)];
+ return (offset_type) extract_unsigned_integer (bytes,
+ sizeof (offset_type),
+ BFD_ENDIAN_LITTLE);
+ }
+
+ /* Return the number of offset_types in this array. */
+ size_t size () const
+ {
+ return m_bytes.size () / sizeof (offset_type);
+ }
+
+ /* Return true if this view is empty. */
+ bool empty () const
+ {
+ return m_bytes.empty ();
+ }
+
+private:
+ /* The underlying bytes. */
+ gdb::array_view<const gdb_byte> m_bytes;
+};
+
+/* A description of .gdb_index index. The file format is described in
+ a comment by the code that writes the index. */
+
+struct mapped_gdb_index final : public mapped_index_base
+{
+ /* Index data format version. */
+ int version = 0;
+
+ /* The address table data. */
+ gdb::array_view<const gdb_byte> address_table;
+
+ /* The symbol table, implemented as a hash table. */
+ offset_view symbol_table;
+
+ /* A pointer to the constant pool. */
+ gdb::array_view<const gdb_byte> constant_pool;
+
+ /* Return the index into the constant pool of the name of the IDXth
+ symbol in the symbol table. */
+ offset_type symbol_name_index (offset_type idx) const
+ {
+ return symbol_table[2 * idx];
+ }
+
+ /* Return the index into the constant pool of the CU vector of the
+ IDXth symbol in the symbol table. */
+ offset_type symbol_vec_index (offset_type idx) const
+ {
+ return symbol_table[2 * idx + 1];
+ }
+
+ bool symbol_name_slot_invalid (offset_type idx) const override
+ {
+ return (symbol_name_index (idx) == 0
+ && symbol_vec_index (idx) == 0);
+ }
+
+ /* Convenience method to get at the name of the symbol at IDX in the
+ symbol table. */
+ const char *symbol_name_at
+ (offset_type idx, dwarf2_per_objfile *per_objfile) const override
+ {
+ return (const char *) (this->constant_pool.data ()
+ + symbol_name_index (idx));
+ }
+
+ size_t symbol_name_count () const override
+ { return this->symbol_table.size () / 2; }
+
+ quick_symbol_functions_up make_quick_functions () const override;
+
+ bool version_check () const override
+ {
+ return version >= 8;
+ }
+};
+
+struct dwarf2_gdb_index : public dwarf2_base_index_functions
+{
+ /* This dumps minimal information about the index.
+ It is called via "mt print objfiles".
+ One use is to verify .gdb_index has been loaded by the
+ gdb.dwarf2/gdb-index.exp testcase. */
+ void dump (struct objfile *objfile) override;
+
+ void expand_matching_symbols
+ (struct objfile *,
+ const lookup_name_info &lookup_name,
+ domain_enum domain,
+ int global,
+ symbol_compare_ftype *ordered_compare) override;
+
+ bool expand_symtabs_matching
+ (struct objfile *objfile,
+ gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
+ const lookup_name_info *lookup_name,
+ gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
+ gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
+ block_search_flags search_flags,
+ domain_enum domain,
+ enum search_domain kind) override;
+};
+
+/* This dumps minimal information about the index.
+ It is called via "mt print objfiles".
+ One use is to verify .gdb_index has been loaded by the
+ gdb.dwarf2/gdb-index.exp testcase. */
+
+void
+dwarf2_gdb_index::dump (struct objfile *objfile)
+{
+ dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
+
+ mapped_gdb_index *index = (gdb::checked_static_cast<mapped_gdb_index *>
+ (per_objfile->per_bfd->index_table.get ()));
+ gdb_printf (".gdb_index: version %d\n", index->version);
+ gdb_printf ("\n");
+}
+
+/* Struct used to manage iterating over all CUs looking for a symbol. */
+
+struct dw2_symtab_iterator
+{
+ /* The dwarf2_per_objfile owning the CUs we are iterating on. */
+ dwarf2_per_objfile *per_objfile;
+ /* If set, only look for symbols that match that block. Valid values are
+ GLOBAL_BLOCK and STATIC_BLOCK. */
+ gdb::optional<block_enum> block_index;
+ /* The kind of symbol we're looking for. */
+ domain_enum domain;
+ /* The list of CUs from the index entry of the symbol,
+ or NULL if not found. */
+ offset_view vec;
+ /* The next element in VEC to look at. */
+ int next;
+ /* The number of elements in VEC, or zero if there is no match. */
+ int length;
+ /* Have we seen a global version of the symbol?
+ If so we can ignore all further global instances.
+ This is to work around gold/15646, inefficient gold-generated
+ indices. */
+ int global_seen;
+};
+
+/* Initialize the index symtab iterator ITER, offset_type NAMEI variant. */
+
+static void
+dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
+ dwarf2_per_objfile *per_objfile,
+ gdb::optional<block_enum> block_index,
+ domain_enum domain, offset_type namei,
+ mapped_gdb_index &index)
+{
+ iter->per_objfile = per_objfile;
+ iter->block_index = block_index;
+ iter->domain = domain;
+ iter->next = 0;
+ iter->global_seen = 0;
+ iter->vec = {};
+ iter->length = 0;
+
+ gdb_assert (!index.symbol_name_slot_invalid (namei));
+ offset_type vec_idx = index.symbol_vec_index (namei);
+
+ iter->vec = offset_view (index.constant_pool.slice (vec_idx));
+ iter->length = iter->vec[0];
+}
+
+/* Return the next matching CU or NULL if there are no more. */
+
+static struct dwarf2_per_cu_data *
+dw2_symtab_iter_next (struct dw2_symtab_iterator *iter,
+ mapped_gdb_index &index)
+{
+ dwarf2_per_objfile *per_objfile = iter->per_objfile;
+
+ for ( ; iter->next < iter->length; ++iter->next)
+ {
+ offset_type cu_index_and_attrs = iter->vec[iter->next + 1];
+ offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
+ gdb_index_symbol_kind symbol_kind =
+ GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
+ /* Only check the symbol attributes if they're present.
+ Indices prior to version 7 don't record them,
+ and indices >= 7 may elide them for certain symbols
+ (gold does this). */
+ int attrs_valid = (index.version >= 7
+ && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
+
+ /* Don't crash on bad data. */
+ if (cu_index >= per_objfile->per_bfd->all_units.size ())
+ {
+ complaint (_(".gdb_index entry has bad CU index"
+ " [in module %s]"), objfile_name (per_objfile->objfile));
+ continue;
+ }
+
+ dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (cu_index);
+
+ /* Skip if already read in. */
+ if (per_objfile->symtab_set_p (per_cu))
+ continue;
+
+ /* Check static vs global. */
+ if (attrs_valid)
+ {
+ bool is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
+
+ if (iter->block_index.has_value ())
+ {
+ bool want_static = *iter->block_index == STATIC_BLOCK;
+
+ if (is_static != want_static)
+ continue;
+ }
+
+ /* Work around gold/15646. */
+ if (!is_static
+ && symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE)
+ {
+ if (iter->global_seen)
+ continue;
+
+ iter->global_seen = 1;
+ }
+ }
+
+ /* Only check the symbol's kind if it has one. */
+ if (attrs_valid)
+ {
+ switch (iter->domain)
+ {
+ case VAR_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
+ && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
+ /* Some types are also in VAR_DOMAIN. */
+ && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
+ continue;
+ break;
+ case STRUCT_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
+ continue;
+ break;
+ case LABEL_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
+ continue;
+ break;
+ case MODULE_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
+ continue;
+ break;
+ default:
+ break;
+ }
+ }
+
+ ++iter->next;
+ return per_cu;
+ }
+
+ return NULL;
+}
+
+void
+dwarf2_gdb_index::expand_matching_symbols
+ (struct objfile *objfile,
+ const lookup_name_info &name, domain_enum domain,
+ int global,
+ symbol_compare_ftype *ordered_compare)
+{
+ /* Used for Ada. */
+ dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
+
+ const block_enum block_kind = global ? GLOBAL_BLOCK : STATIC_BLOCK;
+
+ mapped_gdb_index &index
+ = *(gdb::checked_static_cast<mapped_gdb_index *>
+ (per_objfile->per_bfd->index_table.get ()));
+
+ const char *match_name = name.ada ().lookup_name ().c_str ();
+ auto matcher = [&] (const char *symname)
+ {
+ if (ordered_compare == nullptr)
+ return true;
+ return ordered_compare (symname, match_name) == 0;
+ };
+
+ dw2_expand_symtabs_matching_symbol (index, name, matcher,
+ [&] (offset_type namei)
+ {
+ struct dw2_symtab_iterator iter;
+ struct dwarf2_per_cu_data *per_cu;
+
+ dw2_symtab_iter_init (&iter, per_objfile, block_kind, domain, namei,
+ index);
+ while ((per_cu = dw2_symtab_iter_next (&iter, index)) != NULL)
+ dw2_expand_symtabs_matching_one (per_cu, per_objfile, nullptr,
+ nullptr);
+ return true;
+ }, per_objfile);
+}
+
+/* Helper for dw2_expand_matching symtabs. Called on each symbol
+ matched, to expand corresponding CUs that were marked. IDX is the
+ index of the symbol name that matched. */
+
+static bool
+dw2_expand_marked_cus
+ (dwarf2_per_objfile *per_objfile, offset_type idx,
+ gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
+ gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
+ block_search_flags search_flags,
+ search_domain kind)
+{
+ offset_type vec_len, vec_idx;
+ bool global_seen = false;
+ mapped_gdb_index &index
+ = *(gdb::checked_static_cast<mapped_gdb_index *>
+ (per_objfile->per_bfd->index_table.get ()));
+
+ offset_view vec (index.constant_pool.slice (index.symbol_vec_index (idx)));
+ vec_len = vec[0];
+ for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
+ {
+ offset_type cu_index_and_attrs = vec[vec_idx + 1];
+ /* This value is only valid for index versions >= 7. */
+ int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
+ gdb_index_symbol_kind symbol_kind =
+ GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
+ int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
+ /* Only check the symbol attributes if they're present.
+ Indices prior to version 7 don't record them,
+ and indices >= 7 may elide them for certain symbols
+ (gold does this). */
+ int attrs_valid =
+ (index.version >= 7
+ && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
+
+ /* Work around gold/15646. */
+ if (attrs_valid
+ && !is_static
+ && symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE)
+ {
+ if (global_seen)
+ continue;
+
+ global_seen = true;
+ }
+
+ /* Only check the symbol's kind if it has one. */
+ if (attrs_valid)
+ {
+ if (is_static)
+ {
+ if ((search_flags & SEARCH_STATIC_BLOCK) == 0)
+ continue;
+ }
+ else
+ {
+ if ((search_flags & SEARCH_GLOBAL_BLOCK) == 0)
+ continue;
+ }
+
+ switch (kind)
+ {
+ case VARIABLES_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
+ continue;
+ break;
+ case FUNCTIONS_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
+ continue;
+ break;
+ case TYPES_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
+ continue;
+ break;
+ case MODULES_DOMAIN:
+ if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
+ continue;
+ break;
+ default:
+ break;
+ }
+ }
+
+ /* Don't crash on bad data. */
+ if (cu_index >= per_objfile->per_bfd->all_units.size ())
+ {
+ complaint (_(".gdb_index entry has bad CU index"
+ " [in module %s]"), objfile_name (per_objfile->objfile));
+ continue;
+ }
+
+ dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (cu_index);
+ if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile, file_matcher,
+ expansion_notify))
+ return false;
+ }
+
+ return true;
+}
+
+bool
+dwarf2_gdb_index::expand_symtabs_matching
+ (struct objfile *objfile,
+ gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
+ const lookup_name_info *lookup_name,
+ gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
+ gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
+ block_search_flags search_flags,
+ domain_enum domain,
+ enum search_domain kind)
+{
+ dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
+
+ dw_expand_symtabs_matching_file_matcher (per_objfile, file_matcher);
+
+ /* This invariant is documented in quick-functions.h. */
+ gdb_assert (lookup_name != nullptr || symbol_matcher == nullptr);
+ if (lookup_name == nullptr)
+ {
+ for (dwarf2_per_cu_data *per_cu
+ : all_units_range (per_objfile->per_bfd))
+ {
+ QUIT;
+
+ if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile,
+ file_matcher,
+ expansion_notify))
+ return false;
+ }
+ return true;
+ }
+
+ mapped_gdb_index &index
+ = *(gdb::checked_static_cast<mapped_gdb_index *>
+ (per_objfile->per_bfd->index_table.get ()));
+
+ bool result
+ = dw2_expand_symtabs_matching_symbol (index, *lookup_name,
+ symbol_matcher,
+ [&] (offset_type idx)
+ {
+ if (!dw2_expand_marked_cus (per_objfile, idx, file_matcher,
+ expansion_notify, search_flags, kind))
+ return false;
+ return true;
+ }, per_objfile);
+
+ return result;
+}
+
+quick_symbol_functions_up
+mapped_gdb_index::make_quick_functions () const
+{
+ return quick_symbol_functions_up (new dwarf2_gdb_index);
+}
+
+/* A helper function that reads the .gdb_index from BUFFER and fills
+ in MAP. FILENAME is the name of the file containing the data;
+ it is used for error reporting. DEPRECATED_OK is true if it is
+ ok to use deprecated sections.
+
+ CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
+ out parameters that are filled in with information about the CU and
+ TU lists in the section.
+
+ Returns true if all went well, false otherwise. */
+
+static bool
+read_gdb_index_from_buffer (const char *filename,
+ bool deprecated_ok,
+ gdb::array_view<const gdb_byte> buffer,
+ mapped_gdb_index *map,
+ const gdb_byte **cu_list,
+ offset_type *cu_list_elements,
+ const gdb_byte **types_list,
+ offset_type *types_list_elements)
+{
+ const gdb_byte *addr = &buffer[0];
+ offset_view metadata (buffer);
+
+ /* Version check. */
+ offset_type version = metadata[0];
+ /* Versions earlier than 3 emitted every copy of a psymbol. This
+ causes the index to behave very poorly for certain requests. Version 3
+ contained incomplete addrmap. So, it seems better to just ignore such
+ indices. */
+ if (version < 4)
+ {
+ static int warning_printed = 0;
+ if (!warning_printed)
+ {
+ warning (_("Skipping obsolete .gdb_index section in %s."),
+ filename);
+ warning_printed = 1;
+ }
+ return 0;
+ }
+ /* Index version 4 uses a different hash function than index version
+ 5 and later.
+
+ Versions earlier than 6 did not emit psymbols for inlined
+ functions. Using these files will cause GDB not to be able to
+ set breakpoints on inlined functions by name, so we ignore these
+ indices unless the user has done
+ "set use-deprecated-index-sections on". */
+ if (version < 6 && !deprecated_ok)
+ {
+ static int warning_printed = 0;
+ if (!warning_printed)
+ {
+ warning (_("\
+Skipping deprecated .gdb_index section in %s.\n\
+Do \"set use-deprecated-index-sections on\" before the file is read\n\
+to use the section anyway."),
+ filename);
+ warning_printed = 1;
+ }
+ return 0;
+ }
+ /* Version 7 indices generated by gold refer to the CU for a symbol instead
+ of the TU (for symbols coming from TUs),
+ http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
+ Plus gold-generated indices can have duplicate entries for global symbols,
+ http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
+ These are just performance bugs, and we can't distinguish gdb-generated
+ indices from gold-generated ones, so issue no warning here. */
+
+ /* Indexes with higher version than the one supported by GDB may be no
+ longer backward compatible. */
+ if (version > 8)
+ return 0;
+
+ map->version = version;
+
+ int i = 1;
+ *cu_list = addr + metadata[i];
+ *cu_list_elements = (metadata[i + 1] - metadata[i]) / 8;
+ ++i;
+
+ *types_list = addr + metadata[i];
+ *types_list_elements = (metadata[i + 1] - metadata[i]) / 8;
+ ++i;
+
+ const gdb_byte *address_table = addr + metadata[i];
+ const gdb_byte *address_table_end = addr + metadata[i + 1];
+ map->address_table
+ = gdb::array_view<const gdb_byte> (address_table, address_table_end);
+ ++i;
+
+ const gdb_byte *symbol_table = addr + metadata[i];
+ const gdb_byte *symbol_table_end = addr + metadata[i + 1];
+ map->symbol_table
+ = offset_view (gdb::array_view<const gdb_byte> (symbol_table,
+ symbol_table_end));
+
+ ++i;
+ map->constant_pool = buffer.slice (metadata[i]);
+
+ if (map->constant_pool.empty () && !map->symbol_table.empty ())
+ {
+ /* An empty constant pool implies that all symbol table entries are
+ empty. Make map->symbol_table.empty () == true. */
+ map->symbol_table
+ = offset_view (gdb::array_view<const gdb_byte> (symbol_table,
+ symbol_table));
+ }
+
+ return 1;
+}
+
+/* A helper for create_cus_from_gdb_index that handles a given list of
+ CUs. */
+
+static void
+create_cus_from_gdb_index_list (dwarf2_per_bfd *per_bfd,
+ const gdb_byte *cu_list, offset_type n_elements,
+ struct dwarf2_section_info *section,
+ int is_dwz)
+{
+ for (offset_type i = 0; i < n_elements; i += 2)
+ {
+ gdb_static_assert (sizeof (ULONGEST) >= 8);
+
+ sect_offset sect_off
+ = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
+ ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
+ cu_list += 2 * 8;
+
+ dwarf2_per_cu_data_up per_cu
+ = create_cu_from_index_list (per_bfd, section, is_dwz, sect_off,
+ length);
+ per_bfd->all_units.push_back (std::move (per_cu));
+ }
+}
+
+/* Read the CU list from the mapped index, and use it to create all
+ the CU objects for PER_BFD. */
+
+static void
+create_cus_from_gdb_index (dwarf2_per_bfd *per_bfd,
+ const gdb_byte *cu_list, offset_type cu_list_elements,
+ const gdb_byte *dwz_list, offset_type dwz_elements)
+{
+ gdb_assert (per_bfd->all_units.empty ());
+ per_bfd->all_units.reserve ((cu_list_elements + dwz_elements) / 2);
+
+ create_cus_from_gdb_index_list (per_bfd, cu_list, cu_list_elements,
+ &per_bfd->info, 0);
+
+ if (dwz_elements == 0)
+ return;
+
+ dwz_file *dwz = dwarf2_get_dwz_file (per_bfd);
+ create_cus_from_gdb_index_list (per_bfd, dwz_list, dwz_elements,
+ &dwz->info, 1);
+}
+
+/* Create the signatured type hash table from the index. */
+
+static void
+create_signatured_type_table_from_gdb_index
+ (dwarf2_per_bfd *per_bfd, struct dwarf2_section_info *section,
+ const gdb_byte *bytes, offset_type elements)
+{
+ htab_up sig_types_hash = allocate_signatured_type_table ();
+
+ for (offset_type i = 0; i < elements; i += 3)
+ {
+ signatured_type_up sig_type;
+ ULONGEST signature;
+ void **slot;
+ cu_offset type_offset_in_tu;
+
+ gdb_static_assert (sizeof (ULONGEST) >= 8);
+ sect_offset sect_off
+ = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
+ type_offset_in_tu
+ = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
+ BFD_ENDIAN_LITTLE);
+ signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
+ bytes += 3 * 8;
+
+ sig_type = per_bfd->allocate_signatured_type (signature);
+ sig_type->type_offset_in_tu = type_offset_in_tu;
+ sig_type->section = section;
+ sig_type->sect_off = sect_off;
+
+ slot = htab_find_slot (sig_types_hash.get (), sig_type.get (), INSERT);
+ *slot = sig_type.get ();
+
+ per_bfd->all_units.emplace_back (sig_type.release ());
+ }
+
+ per_bfd->signatured_types = std::move (sig_types_hash);
+}
+
+/* Read the address map data from the mapped GDB index, and use it to
+ populate the index_addrmap. */
+
+static void
+create_addrmap_from_gdb_index (dwarf2_per_objfile *per_objfile,
+ mapped_gdb_index *index)
+{
+ struct objfile *objfile = per_objfile->objfile;
+ dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
+ struct gdbarch *gdbarch = objfile->arch ();
+ const gdb_byte *iter, *end;
+ CORE_ADDR baseaddr;
+
+ addrmap_mutable mutable_map;
+
+ iter = index->address_table.data ();
+ end = iter + index->address_table.size ();
+
+ baseaddr = objfile->text_section_offset ();
+
+ while (iter < end)
+ {
+ ULONGEST hi, lo, cu_index;
+ lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
+ iter += 8;
+ hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
+ iter += 8;
+ cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
+ iter += 4;
+
+ if (lo > hi)
+ {
+ complaint (_(".gdb_index address table has invalid range (%s - %s)"),
+ hex_string (lo), hex_string (hi));
+ continue;
+ }
+
+ if (cu_index >= per_bfd->all_units.size ())
+ {
+ complaint (_(".gdb_index address table has invalid CU number %u"),
+ (unsigned) cu_index);
+ continue;
+ }
+
+ lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr) - baseaddr;
+ hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr) - baseaddr;
+ mutable_map.set_empty (lo, hi - 1, per_bfd->get_cu (cu_index));
+ }
+
+ per_bfd->index_addrmap
+ = new (&per_bfd->obstack) addrmap_fixed (&per_bfd->obstack, &mutable_map);
+}
+
+/* See read-gdb-index.h. */
+
+int
+dwarf2_read_gdb_index
+ (dwarf2_per_objfile *per_objfile,
+ get_gdb_index_contents_ftype get_gdb_index_contents,
+ get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz)
+{
+ const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
+ offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
+ struct dwz_file *dwz;
+ struct objfile *objfile = per_objfile->objfile;
+ dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
+
+ gdb::array_view<const gdb_byte> main_index_contents
+ = get_gdb_index_contents (objfile, per_bfd);
+
+ if (main_index_contents.empty ())
+ return 0;
+
+ std::unique_ptr<mapped_gdb_index> map (new mapped_gdb_index);
+ if (!read_gdb_index_from_buffer (objfile_name (objfile),
+ use_deprecated_index_sections,
+ main_index_contents, map.get (), &cu_list,
+ &cu_list_elements, &types_list,
+ &types_list_elements))
+ return 0;
+
+ /* Don't use the index if it's empty. */
+ if (map->symbol_table.empty ())
+ return 0;
+
+ /* If there is a .dwz file, read it so we can get its CU list as
+ well. */
+ dwz = dwarf2_get_dwz_file (per_bfd);
+ if (dwz != NULL)
+ {
+ mapped_gdb_index dwz_map;
+ const gdb_byte *dwz_types_ignore;
+ offset_type dwz_types_elements_ignore;
+
+ gdb::array_view<const gdb_byte> dwz_index_content
+ = get_gdb_index_contents_dwz (objfile, dwz);
+
+ if (dwz_index_content.empty ())
+ return 0;
+
+ if (!read_gdb_index_from_buffer (bfd_get_filename (dwz->dwz_bfd.get ()),
+ 1, dwz_index_content, &dwz_map,
+ &dwz_list, &dwz_list_elements,
+ &dwz_types_ignore,
+ &dwz_types_elements_ignore))
+ {
+ warning (_("could not read '.gdb_index' section from %s; skipping"),
+ bfd_get_filename (dwz->dwz_bfd.get ()));
+ return 0;
+ }
+ }
+
+ create_cus_from_gdb_index (per_bfd, cu_list, cu_list_elements, dwz_list,
+ dwz_list_elements);
+
+ if (types_list_elements)
+ {
+ /* We can only handle a single .debug_types when we have an
+ index. */
+ if (per_bfd->types.size () > 1)
+ {
+ per_bfd->all_units.clear ();
+ return 0;
+ }
+
+ dwarf2_section_info *section
+ = (per_bfd->types.size () == 1
+ ? &per_bfd->types[0]
+ : &per_bfd->info);
+
+ create_signatured_type_table_from_gdb_index (per_bfd, section, types_list,
+ types_list_elements);
+ }
+
+ finalize_all_units (per_bfd);
+
+ create_addrmap_from_gdb_index (per_objfile, map.get ());
+
+ per_bfd->index_table = std::move (map);
+ per_bfd->quick_file_names_table =
+ create_quick_file_names_table (per_bfd->all_units.size ());
+
+ return 1;
+}
+
+void _initialize_read_gdb_index ();
+
+void
+_initialize_read_gdb_index ()
+{
+ add_setshow_boolean_cmd ("use-deprecated-index-sections",
+ no_class, &use_deprecated_index_sections, _("\
+Set whether to use deprecated gdb_index sections."), _("\
+Show whether to use deprecated gdb_index sections."), _("\
+When enabled, deprecated .gdb_index sections are used anyway.\n\
+Normally they are ignored either because of a missing feature or\n\
+performance issue.\n\
+Warning: This option must be enabled before gdb reads the file."),
+ NULL,
+ NULL,
+ &setlist, &showlist);
+}
--- /dev/null
+/* Reading code for .gdb_index
+
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef DWARF2_READ_GDB_INDEX_H
+#define DWARF2_READ_GDB_INDEX_H
+
+#include "gdbsupport/function-view.h"
+
+struct dwarf2_per_bfd;
+struct dwarf2_per_objfile;
+struct dwz_file;
+struct objfile;
+
+/* Callback types for dwarf2_read_gdb_index. */
+
+typedef gdb::function_view
+ <gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_bfd *)>
+ get_gdb_index_contents_ftype;
+typedef gdb::function_view
+ <gdb::array_view<const gdb_byte>(objfile *, dwz_file *)>
+ get_gdb_index_contents_dwz_ftype;
+
+/* Read .gdb_index. If everything went ok, initialize the "quick"
+ elements of all the CUs and return 1. Otherwise, return 0. */
+
+int dwarf2_read_gdb_index
+ (dwarf2_per_objfile *per_objfile,
+ get_gdb_index_contents_ftype get_gdb_index_contents,
+ get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz);
+
+#endif /* DWARF2_READ_GDB_INDEX_H */
#include "dwarf2/dwz.h"
#include "dwarf2/macro.h"
#include "dwarf2/die.h"
+#include "dwarf2/read-gdb-index.h"
#include "dwarf2/sect-names.h"
#include "dwarf2/stringify.h"
#include "dwarf2/public.h"
/* When true, cross-check physname against demangler. */
static bool check_physname = false;
-/* When true, do not reject deprecated .gdb_index sections. */
-static bool use_deprecated_index_sections = false;
-
/* This is used to store the data that is always per objfile. */
static const registry<objfile>::key<dwarf2_per_objfile>
dwarf2_objfile_data_key;
/* Size of .debug_rnglists section header for 64-bit DWARF format. */
#define RNGLIST_HEADER_SIZE64 20
-/* This is a view into the index that converts from bytes to an
- offset_type, and allows indexing. Unaligned bytes are specifically
- allowed here, and handled via unpacking. */
-
-class offset_view
-{
-public:
- offset_view () = default;
-
- explicit offset_view (gdb::array_view<const gdb_byte> bytes)
- : m_bytes (bytes)
- {
- }
-
- /* Extract the INDEXth offset_type from the array. */
- offset_type operator[] (size_t index) const
- {
- const gdb_byte *bytes = &m_bytes[index * sizeof (offset_type)];
- return (offset_type) extract_unsigned_integer (bytes,
- sizeof (offset_type),
- BFD_ENDIAN_LITTLE);
- }
-
- /* Return the number of offset_types in this array. */
- size_t size () const
- {
- return m_bytes.size () / sizeof (offset_type);
- }
-
- /* Return true if this view is empty. */
- bool empty () const
- {
- return m_bytes.empty ();
- }
-
-private:
- /* The underlying bytes. */
- gdb::array_view<const gdb_byte> m_bytes;
-};
-
-/* A description of .gdb_index index. The file format is described in
- a comment by the code that writes the index. */
-
-struct mapped_gdb_index final : public mapped_index_base
-{
- /* Index data format version. */
- int version = 0;
-
- /* The address table data. */
- gdb::array_view<const gdb_byte> address_table;
-
- /* The symbol table, implemented as a hash table. */
- offset_view symbol_table;
-
- /* A pointer to the constant pool. */
- gdb::array_view<const gdb_byte> constant_pool;
-
- /* Return the index into the constant pool of the name of the IDXth
- symbol in the symbol table. */
- offset_type symbol_name_index (offset_type idx) const
- {
- return symbol_table[2 * idx];
- }
-
- /* Return the index into the constant pool of the CU vector of the
- IDXth symbol in the symbol table. */
- offset_type symbol_vec_index (offset_type idx) const
- {
- return symbol_table[2 * idx + 1];
- }
-
- bool symbol_name_slot_invalid (offset_type idx) const override
- {
- return (symbol_name_index (idx) == 0
- && symbol_vec_index (idx) == 0);
- }
-
- /* Convenience method to get at the name of the symbol at IDX in the
- symbol table. */
- const char *symbol_name_at
- (offset_type idx, dwarf2_per_objfile *per_objfile) const override
- {
- return (const char *) (this->constant_pool.data ()
- + symbol_name_index (idx));
- }
-
- size_t symbol_name_count () const override
- { return this->symbol_table.size () / 2; }
-
- quick_symbol_functions_up make_quick_functions () const override;
-
- bool version_check () const override
- {
- return version >= 8;
- }
-};
-
/* A description of the mapped .debug_names.
Uninitialized map has CU_COUNT 0. */
struct mapped_debug_names final : public mapped_index_base
}
};
-struct dwarf2_gdb_index : public dwarf2_base_index_functions
-{
- void dump (struct objfile *objfile) override;
-
- void expand_matching_symbols
- (struct objfile *,
- const lookup_name_info &lookup_name,
- domain_enum domain,
- int global,
- symbol_compare_ftype *ordered_compare) override;
-
- bool expand_symtabs_matching
- (struct objfile *objfile,
- gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
- const lookup_name_info *lookup_name,
- gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
- gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
- block_search_flags search_flags,
- domain_enum domain,
- enum search_domain kind) override;
-};
-
struct dwarf2_debug_names_index : public dwarf2_base_index_functions
{
void dump (struct objfile *objfile) override;
enum search_domain kind) override;
};
-quick_symbol_functions_up
-mapped_gdb_index::make_quick_functions () const
-{
- return quick_symbol_functions_up (new dwarf2_gdb_index);
-}
-
quick_symbol_functions_up
mapped_debug_names::make_quick_functions () const
{
return result;
}
-/* Return a new dwarf2_per_cu_data allocated on the per-bfd
- obstack, and constructed with the specified field values. */
+/* See read.h. */
dwarf2_per_cu_data_up
create_cu_from_index_list (dwarf2_per_bfd *per_bfd,
return the_cu;
}
-/* A helper for create_cus_from_index that handles a given list of
- CUs. */
-
-static void
-create_cus_from_gdb_index_list (dwarf2_per_bfd *per_bfd,
- const gdb_byte *cu_list, offset_type n_elements,
- struct dwarf2_section_info *section,
- int is_dwz)
-{
- for (offset_type i = 0; i < n_elements; i += 2)
- {
- gdb_static_assert (sizeof (ULONGEST) >= 8);
-
- sect_offset sect_off
- = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
- ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
- cu_list += 2 * 8;
-
- dwarf2_per_cu_data_up per_cu
- = create_cu_from_index_list (per_bfd, section, is_dwz, sect_off,
- length);
- per_bfd->all_units.push_back (std::move (per_cu));
- }
-}
-
-/* Read the CU list from the mapped index, and use it to create all
- the CU objects for PER_BFD. */
-
-static void
-create_cus_from_gdb_index (dwarf2_per_bfd *per_bfd,
- const gdb_byte *cu_list, offset_type cu_list_elements,
- const gdb_byte *dwz_list, offset_type dwz_elements)
-{
- gdb_assert (per_bfd->all_units.empty ());
- per_bfd->all_units.reserve ((cu_list_elements + dwz_elements) / 2);
-
- create_cus_from_gdb_index_list (per_bfd, cu_list, cu_list_elements,
- &per_bfd->info, 0);
-
- if (dwz_elements == 0)
- return;
-
- dwz_file *dwz = dwarf2_get_dwz_file (per_bfd);
- create_cus_from_gdb_index_list (per_bfd, dwz_list, dwz_elements,
- &dwz->info, 1);
-}
-
-/* Create the signatured type hash table from the index. */
-
-static void
-create_signatured_type_table_from_gdb_index
- (dwarf2_per_bfd *per_bfd, struct dwarf2_section_info *section,
- const gdb_byte *bytes, offset_type elements)
-{
- htab_up sig_types_hash = allocate_signatured_type_table ();
-
- for (offset_type i = 0; i < elements; i += 3)
- {
- signatured_type_up sig_type;
- ULONGEST signature;
- void **slot;
- cu_offset type_offset_in_tu;
-
- gdb_static_assert (sizeof (ULONGEST) >= 8);
- sect_offset sect_off
- = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
- type_offset_in_tu
- = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
- BFD_ENDIAN_LITTLE);
- signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
- bytes += 3 * 8;
-
- sig_type = per_bfd->allocate_signatured_type (signature);
- sig_type->type_offset_in_tu = type_offset_in_tu;
- sig_type->section = section;
- sig_type->sect_off = sect_off;
-
- slot = htab_find_slot (sig_types_hash.get (), sig_type.get (), INSERT);
- *slot = sig_type.get ();
-
- per_bfd->all_units.emplace_back (sig_type.release ());
- }
-
- per_bfd->signatured_types = std::move (sig_types_hash);
-}
-
/* Create the signatured type hash table from .debug_names. */
static void
per_objfile->per_bfd->signatured_types = std::move (sig_types_hash);
}
-/* Read the address map data from the mapped GDB index, and use it to
- populate the index_addrmap. */
-
-static void
-create_addrmap_from_gdb_index (dwarf2_per_objfile *per_objfile,
- mapped_gdb_index *index)
-{
- struct objfile *objfile = per_objfile->objfile;
- dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
- struct gdbarch *gdbarch = objfile->arch ();
- const gdb_byte *iter, *end;
- CORE_ADDR baseaddr;
-
- addrmap_mutable mutable_map;
-
- iter = index->address_table.data ();
- end = iter + index->address_table.size ();
-
- baseaddr = objfile->text_section_offset ();
-
- while (iter < end)
- {
- ULONGEST hi, lo, cu_index;
- lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
- iter += 8;
- hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
- iter += 8;
- cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
- iter += 4;
-
- if (lo > hi)
- {
- complaint (_(".gdb_index address table has invalid range (%s - %s)"),
- hex_string (lo), hex_string (hi));
- continue;
- }
-
- if (cu_index >= per_bfd->all_units.size ())
- {
- complaint (_(".gdb_index address table has invalid CU number %u"),
- (unsigned) cu_index);
- continue;
- }
-
- lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr) - baseaddr;
- hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr) - baseaddr;
- mutable_map.set_empty (lo, hi - 1, per_bfd->get_cu (cu_index));
- }
-
- per_bfd->index_addrmap
- = new (&per_bfd->obstack) addrmap_fixed (&per_bfd->obstack, &mutable_map);
-}
-
/* Read the address map data from DWARF-5 .debug_aranges, and use it
to populate given addrmap. Returns true on success, false on
failure. */
&mutable_map);
}
-/* A helper function that reads the .gdb_index from BUFFER and fills
- in MAP. FILENAME is the name of the file containing the data;
- it is used for error reporting. DEPRECATED_OK is true if it is
- ok to use deprecated sections.
-
- CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
- out parameters that are filled in with information about the CU and
- TU lists in the section.
-
- Returns true if all went well, false otherwise. */
-
-static bool
-read_gdb_index_from_buffer (const char *filename,
- bool deprecated_ok,
- gdb::array_view<const gdb_byte> buffer,
- mapped_gdb_index *map,
- const gdb_byte **cu_list,
- offset_type *cu_list_elements,
- const gdb_byte **types_list,
- offset_type *types_list_elements)
-{
- const gdb_byte *addr = &buffer[0];
- offset_view metadata (buffer);
-
- /* Version check. */
- offset_type version = metadata[0];
- /* Versions earlier than 3 emitted every copy of a psymbol. This
- causes the index to behave very poorly for certain requests. Version 3
- contained incomplete addrmap. So, it seems better to just ignore such
- indices. */
- if (version < 4)
- {
- static int warning_printed = 0;
- if (!warning_printed)
- {
- warning (_("Skipping obsolete .gdb_index section in %s."),
- filename);
- warning_printed = 1;
- }
- return 0;
- }
- /* Index version 4 uses a different hash function than index version
- 5 and later.
-
- Versions earlier than 6 did not emit psymbols for inlined
- functions. Using these files will cause GDB not to be able to
- set breakpoints on inlined functions by name, so we ignore these
- indices unless the user has done
- "set use-deprecated-index-sections on". */
- if (version < 6 && !deprecated_ok)
- {
- static int warning_printed = 0;
- if (!warning_printed)
- {
- warning (_("\
-Skipping deprecated .gdb_index section in %s.\n\
-Do \"set use-deprecated-index-sections on\" before the file is read\n\
-to use the section anyway."),
- filename);
- warning_printed = 1;
- }
- return 0;
- }
- /* Version 7 indices generated by gold refer to the CU for a symbol instead
- of the TU (for symbols coming from TUs),
- http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
- Plus gold-generated indices can have duplicate entries for global symbols,
- http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
- These are just performance bugs, and we can't distinguish gdb-generated
- indices from gold-generated ones, so issue no warning here. */
-
- /* Indexes with higher version than the one supported by GDB may be no
- longer backward compatible. */
- if (version > 8)
- return 0;
-
- map->version = version;
-
- int i = 1;
- *cu_list = addr + metadata[i];
- *cu_list_elements = (metadata[i + 1] - metadata[i]) / 8;
- ++i;
-
- *types_list = addr + metadata[i];
- *types_list_elements = (metadata[i + 1] - metadata[i]) / 8;
- ++i;
-
- const gdb_byte *address_table = addr + metadata[i];
- const gdb_byte *address_table_end = addr + metadata[i + 1];
- map->address_table
- = gdb::array_view<const gdb_byte> (address_table, address_table_end);
- ++i;
-
- const gdb_byte *symbol_table = addr + metadata[i];
- const gdb_byte *symbol_table_end = addr + metadata[i + 1];
- map->symbol_table
- = offset_view (gdb::array_view<const gdb_byte> (symbol_table,
- symbol_table_end));
-
- ++i;
- map->constant_pool = buffer.slice (metadata[i]);
-
- if (map->constant_pool.empty () && !map->symbol_table.empty ())
- {
- /* An empty constant pool implies that all symbol table entries are
- empty. Make map->symbol_table.empty () == true. */
- map->symbol_table
- = offset_view (gdb::array_view<const gdb_byte> (symbol_table,
- symbol_table));
- }
-
- return 1;
-}
-
-/* Callback types for dwarf2_read_gdb_index. */
-
-typedef gdb::function_view
- <gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_bfd *)>
- get_gdb_index_contents_ftype;
-typedef gdb::function_view
- <gdb::array_view<const gdb_byte>(objfile *, dwz_file *)>
- get_gdb_index_contents_dwz_ftype;
-
-/* Read .gdb_index. If everything went ok, initialize the "quick"
- elements of all the CUs and return 1. Otherwise, return 0. */
-
-static int
-dwarf2_read_gdb_index
- (dwarf2_per_objfile *per_objfile,
- get_gdb_index_contents_ftype get_gdb_index_contents,
- get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz)
-{
- const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
- offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
- struct dwz_file *dwz;
- struct objfile *objfile = per_objfile->objfile;
- dwarf2_per_bfd *per_bfd = per_objfile->per_bfd;
-
- gdb::array_view<const gdb_byte> main_index_contents
- = get_gdb_index_contents (objfile, per_bfd);
-
- if (main_index_contents.empty ())
- return 0;
-
- std::unique_ptr<mapped_gdb_index> map (new mapped_gdb_index);
- if (!read_gdb_index_from_buffer (objfile_name (objfile),
- use_deprecated_index_sections,
- main_index_contents, map.get (), &cu_list,
- &cu_list_elements, &types_list,
- &types_list_elements))
- return 0;
-
- /* Don't use the index if it's empty. */
- if (map->symbol_table.empty ())
- return 0;
-
- /* If there is a .dwz file, read it so we can get its CU list as
- well. */
- dwz = dwarf2_get_dwz_file (per_bfd);
- if (dwz != NULL)
- {
- mapped_gdb_index dwz_map;
- const gdb_byte *dwz_types_ignore;
- offset_type dwz_types_elements_ignore;
-
- gdb::array_view<const gdb_byte> dwz_index_content
- = get_gdb_index_contents_dwz (objfile, dwz);
-
- if (dwz_index_content.empty ())
- return 0;
-
- if (!read_gdb_index_from_buffer (bfd_get_filename (dwz->dwz_bfd.get ()),
- 1, dwz_index_content, &dwz_map,
- &dwz_list, &dwz_list_elements,
- &dwz_types_ignore,
- &dwz_types_elements_ignore))
- {
- warning (_("could not read '.gdb_index' section from %s; skipping"),
- bfd_get_filename (dwz->dwz_bfd.get ()));
- return 0;
- }
- }
-
- create_cus_from_gdb_index (per_bfd, cu_list, cu_list_elements, dwz_list,
- dwz_list_elements);
-
- if (types_list_elements)
- {
- /* We can only handle a single .debug_types when we have an
- index. */
- if (per_bfd->types.size () > 1)
- {
- per_bfd->all_units.clear ();
- return 0;
- }
-
- dwarf2_section_info *section
- = (per_bfd->types.size () == 1
- ? &per_bfd->types[0]
- : &per_bfd->info);
-
- create_signatured_type_table_from_gdb_index (per_bfd, section, types_list,
- types_list_elements);
- }
-
- finalize_all_units (per_bfd);
-
- create_addrmap_from_gdb_index (per_objfile, map.get ());
-
- per_bfd->index_table = std::move (map);
- per_bfd->quick_file_names_table =
- create_quick_file_names_table (per_bfd->all_units.size ());
-
- return 1;
-}
-
/* die_reader_func for dw2_get_file_names. */
static void
per_cu->free_cached_file_names ();
}
-/* Struct used to manage iterating over all CUs looking for a symbol. */
-
-struct dw2_symtab_iterator
-{
- /* The dwarf2_per_objfile owning the CUs we are iterating on. */
- dwarf2_per_objfile *per_objfile;
- /* If set, only look for symbols that match that block. Valid values are
- GLOBAL_BLOCK and STATIC_BLOCK. */
- gdb::optional<block_enum> block_index;
- /* The kind of symbol we're looking for. */
- domain_enum domain;
- /* The list of CUs from the index entry of the symbol,
- or NULL if not found. */
- offset_view vec;
- /* The next element in VEC to look at. */
- int next;
- /* The number of elements in VEC, or zero if there is no match. */
- int length;
- /* Have we seen a global version of the symbol?
- If so we can ignore all further global instances.
- This is to work around gold/15646, inefficient gold-generated
- indices. */
- int global_seen;
-};
-
-/* Initialize the index symtab iterator ITER, offset_type NAMEI variant. */
-
-static void
-dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
- dwarf2_per_objfile *per_objfile,
- gdb::optional<block_enum> block_index,
- domain_enum domain, offset_type namei,
- mapped_gdb_index &index)
-{
- iter->per_objfile = per_objfile;
- iter->block_index = block_index;
- iter->domain = domain;
- iter->next = 0;
- iter->global_seen = 0;
- iter->vec = {};
- iter->length = 0;
-
- gdb_assert (!index.symbol_name_slot_invalid (namei));
- offset_type vec_idx = index.symbol_vec_index (namei);
-
- iter->vec = offset_view (index.constant_pool.slice (vec_idx));
- iter->length = iter->vec[0];
-}
-
-/* Return the next matching CU or NULL if there are no more. */
-
-static struct dwarf2_per_cu_data *
-dw2_symtab_iter_next (struct dw2_symtab_iterator *iter,
- mapped_gdb_index &index)
-{
- dwarf2_per_objfile *per_objfile = iter->per_objfile;
-
- for ( ; iter->next < iter->length; ++iter->next)
- {
- offset_type cu_index_and_attrs = iter->vec[iter->next + 1];
- offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
- gdb_index_symbol_kind symbol_kind =
- GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
- /* Only check the symbol attributes if they're present.
- Indices prior to version 7 don't record them,
- and indices >= 7 may elide them for certain symbols
- (gold does this). */
- int attrs_valid = (index.version >= 7
- && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
-
- /* Don't crash on bad data. */
- if (cu_index >= per_objfile->per_bfd->all_units.size ())
- {
- complaint (_(".gdb_index entry has bad CU index"
- " [in module %s]"), objfile_name (per_objfile->objfile));
- continue;
- }
-
- dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (cu_index);
-
- /* Skip if already read in. */
- if (per_objfile->symtab_set_p (per_cu))
- continue;
-
- /* Check static vs global. */
- if (attrs_valid)
- {
- bool is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
-
- if (iter->block_index.has_value ())
- {
- bool want_static = *iter->block_index == STATIC_BLOCK;
-
- if (is_static != want_static)
- continue;
- }
-
- /* Work around gold/15646. */
- if (!is_static
- && symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE)
- {
- if (iter->global_seen)
- continue;
-
- iter->global_seen = 1;
- }
- }
-
- /* Only check the symbol's kind if it has one. */
- if (attrs_valid)
- {
- switch (iter->domain)
- {
- case VAR_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
- && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
- /* Some types are also in VAR_DOMAIN. */
- && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
- continue;
- break;
- case STRUCT_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
- continue;
- break;
- case LABEL_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
- continue;
- break;
- case MODULE_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
- continue;
- break;
- default:
- break;
- }
- }
-
- ++iter->next;
- return per_cu;
- }
-
- return NULL;
-}
-
void
dwarf2_base_index_functions::print_stats (struct objfile *objfile,
bool print_bcache)
gdb_printf (_(" Number of unread CUs: %d\n"), count);
}
-/* This dumps minimal information about the index.
- It is called via "mt print objfiles".
- One use is to verify .gdb_index has been loaded by the
- gdb.dwarf2/gdb-index.exp testcase. */
-
-void
-dwarf2_gdb_index::dump (struct objfile *objfile)
-{
- dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
-
- mapped_gdb_index *index = (gdb::checked_static_cast<mapped_gdb_index *>
- (per_objfile->per_bfd->index_table.get ()));
- gdb_printf (".gdb_index: version %d\n", index->version);
- gdb_printf ("\n");
-}
-
void
dwarf2_base_index_functions::expand_all_symtabs (struct objfile *objfile)
{
}
}
-void
-dwarf2_gdb_index::expand_matching_symbols
- (struct objfile *objfile,
- const lookup_name_info &name, domain_enum domain,
- int global,
- symbol_compare_ftype *ordered_compare)
-{
- /* Used for Ada. */
- dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
-
- const block_enum block_kind = global ? GLOBAL_BLOCK : STATIC_BLOCK;
-
- mapped_gdb_index &index
- = *(gdb::checked_static_cast<mapped_gdb_index *>
- (per_objfile->per_bfd->index_table.get ()));
-
- const char *match_name = name.ada ().lookup_name ().c_str ();
- auto matcher = [&] (const char *symname)
- {
- if (ordered_compare == nullptr)
- return true;
- return ordered_compare (symname, match_name) == 0;
- };
-
- dw2_expand_symtabs_matching_symbol (index, name, matcher,
- [&] (offset_type namei)
- {
- struct dw2_symtab_iterator iter;
- struct dwarf2_per_cu_data *per_cu;
-
- dw2_symtab_iter_init (&iter, per_objfile, block_kind, domain, namei,
- index);
- while ((per_cu = dw2_symtab_iter_next (&iter, index)) != NULL)
- dw2_expand_symtabs_matching_one (per_cu, per_objfile, nullptr,
- nullptr);
- return true;
- }, per_objfile);
-}
/* Starting from a search name, return the string that finds the upper
bound of all strings that start with SEARCH_NAME in a sorted name
return true;
}
-/* Helper for dw2_expand_matching symtabs. Called on each symbol
- matched, to expand corresponding CUs that were marked. IDX is the
- index of the symbol name that matched. */
-
-static bool
-dw2_expand_marked_cus
- (dwarf2_per_objfile *per_objfile, offset_type idx,
- gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
- gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
- block_search_flags search_flags,
- search_domain kind)
-{
- offset_type vec_len, vec_idx;
- bool global_seen = false;
- mapped_gdb_index &index
- = *(gdb::checked_static_cast<mapped_gdb_index *>
- (per_objfile->per_bfd->index_table.get ()));
-
- offset_view vec (index.constant_pool.slice (index.symbol_vec_index (idx)));
- vec_len = vec[0];
- for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
- {
- offset_type cu_index_and_attrs = vec[vec_idx + 1];
- /* This value is only valid for index versions >= 7. */
- int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
- gdb_index_symbol_kind symbol_kind =
- GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
- int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
- /* Only check the symbol attributes if they're present.
- Indices prior to version 7 don't record them,
- and indices >= 7 may elide them for certain symbols
- (gold does this). */
- int attrs_valid =
- (index.version >= 7
- && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
-
- /* Work around gold/15646. */
- if (attrs_valid
- && !is_static
- && symbol_kind == GDB_INDEX_SYMBOL_KIND_TYPE)
- {
- if (global_seen)
- continue;
-
- global_seen = true;
- }
-
- /* Only check the symbol's kind if it has one. */
- if (attrs_valid)
- {
- if (is_static)
- {
- if ((search_flags & SEARCH_STATIC_BLOCK) == 0)
- continue;
- }
- else
- {
- if ((search_flags & SEARCH_GLOBAL_BLOCK) == 0)
- continue;
- }
-
- switch (kind)
- {
- case VARIABLES_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
- continue;
- break;
- case FUNCTIONS_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
- continue;
- break;
- case TYPES_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
- continue;
- break;
- case MODULES_DOMAIN:
- if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
- continue;
- break;
- default:
- break;
- }
- }
-
- /* Don't crash on bad data. */
- if (cu_index >= per_objfile->per_bfd->all_units.size ())
- {
- complaint (_(".gdb_index entry has bad CU index"
- " [in module %s]"), objfile_name (per_objfile->objfile));
- continue;
- }
-
- dwarf2_per_cu_data *per_cu = per_objfile->per_bfd->get_cu (cu_index);
- if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile, file_matcher,
- expansion_notify))
- return false;
- }
-
- return true;
-}
-
/* See read.h. */
void
}
}
-bool
-dwarf2_gdb_index::expand_symtabs_matching
- (struct objfile *objfile,
- gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
- const lookup_name_info *lookup_name,
- gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
- gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
- block_search_flags search_flags,
- domain_enum domain,
- enum search_domain kind)
-{
- dwarf2_per_objfile *per_objfile = get_dwarf2_per_objfile (objfile);
-
- dw_expand_symtabs_matching_file_matcher (per_objfile, file_matcher);
-
- /* This invariant is documented in quick-functions.h. */
- gdb_assert (lookup_name != nullptr || symbol_matcher == nullptr);
- if (lookup_name == nullptr)
- {
- for (dwarf2_per_cu_data *per_cu
- : all_units_range (per_objfile->per_bfd))
- {
- QUIT;
-
- if (!dw2_expand_symtabs_matching_one (per_cu, per_objfile,
- file_matcher,
- expansion_notify))
- return false;
- }
- return true;
- }
-
- mapped_gdb_index &index
- = *(gdb::checked_static_cast<mapped_gdb_index *>
- (per_objfile->per_bfd->index_table.get ()));
-
- bool result
- = dw2_expand_symtabs_matching_symbol (index, *lookup_name,
- symbol_matcher,
- [&] (offset_type idx)
- {
- if (!dw2_expand_marked_cus (per_objfile, idx, file_matcher,
- expansion_notify, search_flags, kind))
- return false;
- return true;
- }, per_objfile);
-
- return result;
-}
/* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
symtab. */
NULL, show_check_physname,
&setdebuglist, &showdebuglist);
- add_setshow_boolean_cmd ("use-deprecated-index-sections",
- no_class, &use_deprecated_index_sections, _("\
-Set whether to use deprecated gdb_index sections."), _("\
-Show whether to use deprecated gdb_index sections."), _("\
-When enabled, deprecated .gdb_index sections are used anyway.\n\
-Normally they are ignored either because of a missing feature or\n\
-performance issue.\n\
-Warning: This option must be enabled before gdb reads the file."),
- NULL,
- NULL,
- &setlist, &showlist);
-
dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
&dwarf2_locexpr_funcs);
dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
projects / thirdparty / binutils-gdb.git / commitdiff
