Move some code from dwarf2/read.c to die.c

This patch introduces a new file, dwarf2/die.c, and moves some
DIE-related code out of dwarf2/read.c and into this new file.  This is
just a small part of the long-term project to split up read.c.
(According to 'wc', dwarf2/read.c is the largest file in gdb by around
8000 LOC.)

Regression tested on x86-64 Fedora 36.

1 files changed, 21 insertions, 0 deletions

diff --git a/gdb/dwarf2/die.h b/gdb/dwarf2/die.h
index ae46514..cdee469 100644
--- a/gdb/dwarf2/die.h
+++ b/gdb/dwarf2/die.h
@@ -21,10 +21,31 @@
 #define GDB_DWARF2_DIE_H
 
 #include "complaints.h"
+#include "dwarf2/attribute.h"
 
 /* This data structure holds a complete die structure.  */
 struct die_info
 {
+  /* Allocate a new die_info on OBSTACK.  NUM_ATTRS is the number of
+     attributes that are needed.  */
+  static die_info *allocate (struct obstack *obstack, int num_attrs);
+
+  /* Trivial hash function for die_info: the hash value of a DIE is
+     its offset in .debug_info for this objfile.  */
+  static hashval_t hash (const void *item);
+
+  /* Trivial comparison function for die_info structures: two DIEs
+     are equal if they have the same offset.  */
+  static int eq (const void *item_lhs, const void *item_rhs);
+
+  /* Dump this DIE and any children to MAX_LEVEL.  They are written to
+     gdb_stdlog.  Note this is called from the pdie user command in
+     gdb-gdb.gdb.  */
+  void dump (int max_level);
+
+  /* Shallowly dump this DIE to gdb_stderr.  */
+  void error_dump ();
+
   /* Return the named attribute or NULL if not there, but do not
      follow DW_AT_specification, etc.  */
   struct attribute *attr (dwarf_attribute name)