1 files changed, 295 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/block.c b/contrib/gdb/gdb/block.c
new file mode 100644
index 0000000..28b1181
--- /dev/null
+++ b/contrib/gdb/gdb/block.c
@@ -0,0 +1,295 @@
+/* Block-related functions for the GNU debugger, GDB.
+
+   Copyright 2003 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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "block.h"
+#include "symtab.h"
+#include "symfile.h"
+#include "gdb_obstack.h"
+#include "cp-support.h"
+
+/* This is used by struct block to store namespace-related info for
+   C++ files, namely using declarations and the current namespace in
+   scope.  */
+
+struct block_namespace_info
+{
+  const char *scope;
+  struct using_direct *using;
+};
+
+static void block_initialize_namespace (struct block *block,
+					struct obstack *obstack);
+
+/* Return Nonzero if block a is lexically nested within block b,
+   or if a and b have the same pc range.
+   Return zero otherwise. */
+
+int
+contained_in (const struct block *a, const struct block *b)
+{
+  if (!a || !b)
+    return 0;
+  return BLOCK_START (a) >= BLOCK_START (b)
+    && BLOCK_END (a) <= BLOCK_END (b);
+}
+
+
+/* Return the symbol for the function which contains a specified
+   lexical block, described by a struct block BL.  */
+
+struct symbol *
+block_function (const struct block *bl)
+{
+  while (BLOCK_FUNCTION (bl) == 0 && BLOCK_SUPERBLOCK (bl) != 0)
+    bl = BLOCK_SUPERBLOCK (bl);
+
+  return BLOCK_FUNCTION (bl);
+}
+
+/* Return the blockvector immediately containing the innermost lexical block
+   containing the specified pc value and section, or 0 if there is none.
+   PINDEX is a pointer to the index value of the block.  If PINDEX
+   is NULL, we don't pass this information back to the caller.  */
+
+struct blockvector *
+blockvector_for_pc_sect (CORE_ADDR pc, struct bfd_section *section,
+			 int *pindex, struct symtab *symtab)
+{
+  struct block *b;
+  int bot, top, half;
+  struct blockvector *bl;
+
+  if (symtab == 0)		/* if no symtab specified by caller */
+    {
+      /* First search all symtabs for one whose file contains our pc */
+      symtab = find_pc_sect_symtab (pc, section);
+      if (symtab == 0)
+	return 0;
+    }
+
+  bl = BLOCKVECTOR (symtab);
+  b = BLOCKVECTOR_BLOCK (bl, 0);
+
+  /* Then search that symtab for the smallest block that wins.  */
+  /* Use binary search to find the last block that starts before PC.  */
+
+  bot = 0;
+  top = BLOCKVECTOR_NBLOCKS (bl);
+
+  while (top - bot > 1)
+    {
+      half = (top - bot + 1) >> 1;
+      b = BLOCKVECTOR_BLOCK (bl, bot + half);
+      if (BLOCK_START (b) <= pc)
+	bot += half;
+      else
+	top = bot + half;
+    }
+
+  /* Now search backward for a block that ends after PC.  */
+
+  while (bot >= 0)
+    {
+      b = BLOCKVECTOR_BLOCK (bl, bot);
+      if (BLOCK_END (b) > pc)
+	{
+	  if (pindex)
+	    *pindex = bot;
+	  return bl;
+	}
+      bot--;
+    }
+  return 0;
+}
+
+/* Return the blockvector immediately containing the innermost lexical block
+   containing the specified pc value, or 0 if there is none.
+   Backward compatibility, no section.  */
+
+struct blockvector *
+blockvector_for_pc (CORE_ADDR pc, int *pindex)
+{
+  return blockvector_for_pc_sect (pc, find_pc_mapped_section (pc),
+				  pindex, NULL);
+}
+
+/* Return the innermost lexical block containing the specified pc value
+   in the specified section, or 0 if there is none.  */
+
+struct block *
+block_for_pc_sect (CORE_ADDR pc, struct bfd_section *section)
+{
+  struct blockvector *bl;
+  int index;
+
+  bl = blockvector_for_pc_sect (pc, section, &index, NULL);
+  if (bl)
+    return BLOCKVECTOR_BLOCK (bl, index);
+  return 0;
+}
+
+/* Return the innermost lexical block containing the specified pc value,
+   or 0 if there is none.  Backward compatibility, no section.  */
+
+struct block *
+block_for_pc (CORE_ADDR pc)
+{
+  return block_for_pc_sect (pc, find_pc_mapped_section (pc));
+}
+
+/* Now come some functions designed to deal with C++ namespace issues.
+   The accessors are safe to use even in the non-C++ case.  */
+
+/* This returns the namespace that BLOCK is enclosed in, or "" if it
+   isn't enclosed in a namespace at all.  This travels the chain of
+   superblocks looking for a scope, if necessary.  */
+
+const char *
+block_scope (const struct block *block)
+{
+  for (; block != NULL; block = BLOCK_SUPERBLOCK (block))
+    {
+      if (BLOCK_NAMESPACE (block) != NULL
+	  && BLOCK_NAMESPACE (block)->scope != NULL)
+	return BLOCK_NAMESPACE (block)->scope;
+    }
+
+  return "";
+}
+
+/* Set BLOCK's scope member to SCOPE; if needed, allocate memory via
+   OBSTACK.  (It won't make a copy of SCOPE, however, so that already
+   has to be allocated correctly.)  */
+
+void
+block_set_scope (struct block *block, const char *scope,
+		 struct obstack *obstack)
+{
+  block_initialize_namespace (block, obstack);
+
+  BLOCK_NAMESPACE (block)->scope = scope;
+}
+
+/* This returns the first using directives associated to BLOCK, if
+   any.  */
+
+/* FIXME: carlton/2003-04-23: This uses the fact that we currently
+   only have using directives in static blocks, because we only
+   generate using directives from anonymous namespaces.  Eventually,
+   when we support using directives everywhere, we'll want to replace
+   this by some iterator functions.  */
+
+struct using_direct *
+block_using (const struct block *block)
+{
+  const struct block *static_block = block_static_block (block);
+
+  if (static_block == NULL
+      || BLOCK_NAMESPACE (static_block) == NULL)
+    return NULL;
+  else
+    return BLOCK_NAMESPACE (static_block)->using;
+}
+
+/* Set BLOCK's using member to USING; if needed, allocate memory via
+   OBSTACK.  (It won't make a copy of USING, however, so that already
+   has to be allocated correctly.)  */
+
+void
+block_set_using (struct block *block,
+		 struct using_direct *using,
+		 struct obstack *obstack)
+{
+  block_initialize_namespace (block, obstack);
+
+  BLOCK_NAMESPACE (block)->using = using;
+}
+
+/* If BLOCK_NAMESPACE (block) is NULL, allocate it via OBSTACK and
+   ititialize its members to zero.  */
+
+static void
+block_initialize_namespace (struct block *block, struct obstack *obstack)
+{
+  if (BLOCK_NAMESPACE (block) == NULL)
+    {
+      BLOCK_NAMESPACE (block)
+	= obstack_alloc (obstack, sizeof (struct block_namespace_info));
+      BLOCK_NAMESPACE (block)->scope = NULL;
+      BLOCK_NAMESPACE (block)->using = NULL;
+    }
+}
+
+/* Return the static block associated to BLOCK.  Return NULL if block
+   is NULL or if block is a global block.  */
+
+const struct block *
+block_static_block (const struct block *block)
+{
+  if (block == NULL || BLOCK_SUPERBLOCK (block) == NULL)
+    return NULL;
+
+  while (BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (block)) != NULL)
+    block = BLOCK_SUPERBLOCK (block);
+
+  return block;
+}
+
+/* Return the static block associated to BLOCK.  Return NULL if block
+   is NULL.  */
+
+const struct block *
+block_global_block (const struct block *block)
+{
+  if (block == NULL)
+    return NULL;
+
+  while (BLOCK_SUPERBLOCK (block) != NULL)
+    block = BLOCK_SUPERBLOCK (block);
+
+  return block;
+}
+
+/* Allocate a block on OBSTACK, and initialize its elements to
+   zero/NULL.  This is useful for creating "dummy" blocks that don't
+   correspond to actual source files.
+
+   Warning: it sets the block's BLOCK_DICT to NULL, which isn't a
+   valid value.  If you really don't want the block to have a
+   dictionary, then you should subsequently set its BLOCK_DICT to
+   dict_create_linear (obstack, NULL).  */
+
+struct block *
+allocate_block (struct obstack *obstack)
+{
+  struct block *bl = obstack_alloc (obstack, sizeof (struct block));
+
+  BLOCK_START (bl) = 0;
+  BLOCK_END (bl) = 0;
+  BLOCK_FUNCTION (bl) = NULL;
+  BLOCK_SUPERBLOCK (bl) = NULL;
+  BLOCK_DICT (bl) = NULL;
+  BLOCK_NAMESPACE (bl) = NULL;
+  BLOCK_GCC_COMPILED (bl) = 0;
+
+  return bl;
+}