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/* 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 (struct block *a, 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 (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 (register CORE_ADDR pc, struct sec *section,
int *pindex, struct symtab *symtab)
{
register struct block *b;
register 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 */
if ((symtab = find_pc_sect_symtab (pc, section)) == 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 (register 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 (register CORE_ADDR pc, struct sec *section)
{
register 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 (register 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. */
/* 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;
}
/* 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;
}
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