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/* Code dealing with blocks for 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. */
#ifndef BLOCK_H
#define BLOCK_H
/* Opaque declarations. */
struct symbol;
struct dictionary;
struct namespace_info;
struct using_direct;
struct obstack;
/* All of the name-scope contours of the program
are represented by `struct block' objects.
All of these objects are pointed to by the blockvector.
Each block represents one name scope.
Each lexical context has its own block.
The blockvector begins with some special blocks.
The GLOBAL_BLOCK contains all the symbols defined in this compilation
whose scope is the entire program linked together.
The STATIC_BLOCK contains all the symbols whose scope is the
entire compilation excluding other separate compilations.
Blocks starting with the FIRST_LOCAL_BLOCK are not special.
Each block records a range of core addresses for the code that
is in the scope of the block. The STATIC_BLOCK and GLOBAL_BLOCK
give, for the range of code, the entire range of code produced
by the compilation that the symbol segment belongs to.
The blocks appear in the blockvector
in order of increasing starting-address,
and, within that, in order of decreasing ending-address.
This implies that within the body of one function
the blocks appear in the order of a depth-first tree walk. */
struct block
{
/* Addresses in the executable code that are in this block. */
CORE_ADDR startaddr;
CORE_ADDR endaddr;
/* The symbol that names this block, if the block is the body of a
function; otherwise, zero. */
struct symbol *function;
/* The `struct block' for the containing block, or 0 if none.
The superblock of a top-level local block (i.e. a function in the
case of C) is the STATIC_BLOCK. The superblock of the
STATIC_BLOCK is the GLOBAL_BLOCK. */
struct block *superblock;
/* This is used to store the symbols in the block. */
struct dictionary *dict;
/* Used for language-specific info. */
union
{
struct
{
/* Contains information about namespace-related info relevant to
this block: using directives and the current namespace
scope. */
struct namespace_info *namespace;
}
cplus_specific;
}
language_specific;
/* Version of GCC used to compile the function corresponding
to this block, or 0 if not compiled with GCC. When possible,
GCC should be compatible with the native compiler, or if that
is not feasible, the differences should be fixed during symbol
reading. As of 16 Apr 93, this flag is never used to distinguish
between gcc2 and the native compiler.
If there is no function corresponding to this block, this meaning
of this flag is undefined. */
unsigned char gcc_compile_flag;
};
#define BLOCK_START(bl) (bl)->startaddr
#define BLOCK_END(bl) (bl)->endaddr
#define BLOCK_FUNCTION(bl) (bl)->function
#define BLOCK_SUPERBLOCK(bl) (bl)->superblock
#define BLOCK_DICT(bl) (bl)->dict
#define BLOCK_NAMESPACE(bl) (bl)->language_specific.cplus_specific.namespace
#define BLOCK_GCC_COMPILED(bl) (bl)->gcc_compile_flag
struct blockvector
{
/* Number of blocks in the list. */
int nblocks;
/* The blocks themselves. */
struct block *block[1];
};
#define BLOCKVECTOR_NBLOCKS(blocklist) (blocklist)->nblocks
#define BLOCKVECTOR_BLOCK(blocklist,n) (blocklist)->block[n]
/* Special block numbers */
#define GLOBAL_BLOCK 0
#define STATIC_BLOCK 1
#define FIRST_LOCAL_BLOCK 2
extern struct symbol *block_function (const struct block *);
extern int contained_in (const struct block *, const struct block *);
extern const char *block_scope (const struct block *block);
extern void block_set_scope (struct block *block, const char *scope,
struct obstack *obstack);
extern void block_set_using (struct block *block,
struct using_direct *using,
struct obstack *obstack);
extern const struct block *block_static_block (const struct block *block);
/* In an ideal world, this would be opaque: don't access it directly,
just use the iterator functions. */
struct block_using_iterator
{
const struct block *current_block;
const struct using_direct *next_directive;
};
/* Initialize ITERATOR to point at the first using directive valid for
BLOCK, and return that using directive, or NULL if there aren't
any. */
extern const struct
using_direct *block_using_iterator_first (const struct block *block,
struct block_using_iterator
*iterator);
/* Advance ITERATOR, and return the next using directive, or NULL if
there aren't any more. Don't call this if you've previously
received NULL from block_using_iterator_first or
block_using_iterator_next during this iteration. */
extern const struct
using_direct *block_using_iterator_next (struct block_using_iterator
*iterator);
/* Allocate a dummy block. See warnings before the source code of
this function about using it correctly. */
extern struct block *allocate_block (struct obstack *obstack);
#endif /* BLOCK_H */
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