Move mapped_index_base to new header file

This moves mapped_index_base and the helper struct name_component to a
new header file in gdb/dwarf2/.

3 files changed, 98 insertions, 72 deletions

diff --git a/gdb/dwarf2/mapped-index.h b/gdb/dwarf2/mapped-index.h
new file mode 100644
index 0000000..c2ff27a
--- /dev/null
+++ b/gdb/dwarf2/mapped-index.h
@@ -0,0 +1,97 @@
+/* Base class for mapped indices
+
+   Copyright (C) 2021 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 GDB_DWARF2_MAPPED_INDEX_H
+#define GDB_DWARF2_MAPPED_INDEX_H
+
+#include "language.h"
+
+/* An index into a (C++) symbol name component in a symbol name as
+   recorded in the mapped_index's symbol table.  For each C++ symbol
+   in the symbol table, we record one entry for the start of each
+   component in the symbol in a table of name components, and then
+   sort the table, in order to be able to binary search symbol names,
+   ignoring leading namespaces, both completion and regular look up.
+   For example, for symbol "A::B::C", we'll have an entry that points
+   to "A::B::C", another that points to "B::C", and another for "C".
+   Note that function symbols in GDB index have no parameter
+   information, just the function/method names.  You can convert a
+   name_component to a "const char *" using the
+   'mapped_index::symbol_name_at(offset_type)' method.  */
+
+struct name_component
+{
+  /* Offset in the symbol name where the component starts.  Stored as
+     a (32-bit) offset instead of a pointer to save memory and improve
+     locality on 64-bit architectures.  */
+  offset_type name_offset;
+
+  /* The symbol's index in the symbol and constant pool tables of a
+     mapped_index.  */
+  offset_type idx;
+};
+
+/* Base class containing bits shared by both .gdb_index and
+   .debug_name indexes.  */
+
+struct mapped_index_base
+{
+  mapped_index_base () = default;
+  DISABLE_COPY_AND_ASSIGN (mapped_index_base);
+
+  /* The name_component table (a sorted vector).  See name_component's
+     description above.  */
+  std::vector<name_component> name_components;
+
+  /* How NAME_COMPONENTS is sorted.  */
+  enum case_sensitivity name_components_casing;
+
+  /* Return the number of names in the symbol table.  */
+  virtual size_t symbol_name_count () const = 0;
+
+  /* Get the name of the symbol at IDX in the symbol table.  */
+  virtual const char *symbol_name_at
+    (offset_type idx, dwarf2_per_objfile *per_objfile) const = 0;
+
+  /* Return whether the name at IDX in the symbol table should be
+     ignored.  */
+  virtual bool symbol_name_slot_invalid (offset_type idx) const
+  {
+    return false;
+  }
+
+  /* Build the symbol name component sorted vector, if we haven't
+     yet.  */
+  void build_name_components (dwarf2_per_objfile *per_objfile);
+
+  /* Returns the lower (inclusive) and upper (exclusive) bounds of the
+     possible matches for LN_NO_PARAMS in the name component
+     vector.  */
+  std::pair<std::vector<name_component>::const_iterator,
+	    std::vector<name_component>::const_iterator>
+    find_name_components_bounds (const lookup_name_info &ln_no_params,
+				 enum language lang,
+				 dwarf2_per_objfile *per_objfile) const;
+
+  /* Prevent deleting/destroying via a base class pointer.  */
+protected:
+  ~mapped_index_base() = default;
+};
+
+#endif /* GDB_DWARF2_MAPPED_INDEX_H */
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 6dcd446..3f44c72 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -156,78 +156,6 @@ static int dwarf2_loclist_block_index;
 /* Size of .debug_rnglists section header for 64-bit DWARF format.  */
 #define RNGLIST_HEADER_SIZE64 20
 
-/* An index into a (C++) symbol name component in a symbol name as
-   recorded in the mapped_index's symbol table.  For each C++ symbol
-   in the symbol table, we record one entry for the start of each
-   component in the symbol in a table of name components, and then
-   sort the table, in order to be able to binary search symbol names,
-   ignoring leading namespaces, both completion and regular look up.
-   For example, for symbol "A::B::C", we'll have an entry that points
-   to "A::B::C", another that points to "B::C", and another for "C".
-   Note that function symbols in GDB index have no parameter
-   information, just the function/method names.  You can convert a
-   name_component to a "const char *" using the
-   'mapped_index::symbol_name_at(offset_type)' method.  */
-
-struct name_component
-{
-  /* Offset in the symbol name where the component starts.  Stored as
-     a (32-bit) offset instead of a pointer to save memory and improve
-     locality on 64-bit architectures.  */
-  offset_type name_offset;
-
-  /* The symbol's index in the symbol and constant pool tables of a
-     mapped_index.  */
-  offset_type idx;
-};
-
-/* Base class containing bits shared by both .gdb_index and
-   .debug_name indexes.  */
-
-struct mapped_index_base
-{
-  mapped_index_base () = default;
-  DISABLE_COPY_AND_ASSIGN (mapped_index_base);
-
-  /* The name_component table (a sorted vector).  See name_component's
-     description above.  */
-  std::vector<name_component> name_components;
-
-  /* How NAME_COMPONENTS is sorted.  */
-  enum case_sensitivity name_components_casing;
-
-  /* Return the number of names in the symbol table.  */
-  virtual size_t symbol_name_count () const = 0;
-
-  /* Get the name of the symbol at IDX in the symbol table.  */
-  virtual const char *symbol_name_at
-    (offset_type idx, dwarf2_per_objfile *per_objfile) const = 0;
-
-  /* Return whether the name at IDX in the symbol table should be
-     ignored.  */
-  virtual bool symbol_name_slot_invalid (offset_type idx) const
-  {
-    return false;
-  }
-
-  /* Build the symbol name component sorted vector, if we haven't
-     yet.  */
-  void build_name_components (dwarf2_per_objfile *per_objfile);
-
-  /* Returns the lower (inclusive) and upper (exclusive) bounds of the
-     possible matches for LN_NO_PARAMS in the name component
-     vector.  */
-  std::pair<std::vector<name_component>::const_iterator,
-	    std::vector<name_component>::const_iterator>
-    find_name_components_bounds (const lookup_name_info &ln_no_params,
-				 enum language lang,
-				 dwarf2_per_objfile *per_objfile) const;
-
-  /* Prevent deleting/destroying via a base class pointer.  */
-protected:
-  ~mapped_index_base() = default;
-};
-
 /* 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.  */
diff --git a/gdb/dwarf2/read.h b/gdb/dwarf2/read.h
index be3b9d1..f3b09c6 100644
--- a/gdb/dwarf2/read.h
+++ b/gdb/dwarf2/read.h
@@ -26,6 +26,7 @@
 #include "dwarf2/cooked-index.h"
 #include "dwarf2/file-and-dir.h"
 #include "dwarf2/index-cache.h"
+#include "dwarf2/mapped-index.h"
 #include "dwarf2/section.h"
 #include "filename-seen-cache.h"
 #include "gdbsupport/gdb_obstack.h"