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/* Tree based points-to analysis
Copyright (C) 2002, 2003 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dberlin@dberlin.org>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
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.
GCC 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 GCC; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef TREE_ALIAS_COMMON
#define TREE_ALIAS_COMMON
#include "tree-alias-type.h"
/* Alias analysis function pointers.
Functions implemented by the actual alias analysis algorithms in
order for them to work with the common points-to structure. */
struct tree_alias_ops
{
/* Initialization.
Called right before we start using the other functions. */
void (*init) (struct tree_alias_ops *);
/* Cleanup.
Called when we are finished with the alias analyzer. */
void (*cleanup) (struct tree_alias_ops *);
/* Add variable.
Called when we want to inform the alias analyzer about a new
variable we've found. */
alias_var (*add_var) (struct tree_alias_ops *, tree);
/* Add variable equivalent to existing one.
Called when we want to inform the alias analyzer about a new
variable that has the same points-to set as an existing
variable. */
alias_var (*add_var_same) (struct tree_alias_ops *, tree,
alias_var);
/* Process a simple assignment (a = b).
Called to process simple assignment statements of the form a = b,
where a and b are both variables. */
void (*simple_assign) (struct tree_alias_ops *, alias_var,
alias_var);
/* Process an address assignment (a = &b).
Called to process address assignment statements of the form a =
&b, where a and b are both variables. */
void (*addr_assign) (struct tree_alias_ops *, alias_var, alias_var);
/* Process a pointer assignment (a = *b).
Called to process pointer assignment statements of the form a =
*b, where a and b are both variables. */
void (*ptr_assign) (struct tree_alias_ops *, alias_var, alias_var);
/* Process an operator assignment (a = op (...))
Called to process operators of the form a = op(...), where a is a
variable. */
void (*op_assign) (struct tree_alias_ops *, alias_var, varray_type,
tree, bitmap);
/* Process a heap assignment (a = alloc (...))
Called to process a heap assignment of the form a = alloc
(...), where a is a variable, and *alloc is a function that
returns new memory. */
void (*heap_assign) (struct tree_alias_ops *, alias_var);
/* Process an assignment to a pointer (*a = b)
Called to process assignment to pointer statements of the form
*a = b, where a and b are both variables. */
void (*assign_ptr) (struct tree_alias_ops *, alias_var, alias_var);
/* Process a function definition.
Called to inform the alias analyzer about a new function
definition. */
void (*function_def) (struct tree_alias_ops *, alias_var,
varray_type, alias_var);
/* Process a function call.
Return 1 if we need to assume conservative side-effects. */
int (*function_call) (struct tree_alias_ops *, alias_var,
alias_var, varray_type, bitmap);
/* Determine if two alias variables may alias. */
bool (*may_alias) (struct tree_alias_ops *, alias_var, alias_var);
/* Determine if two alias variables have the same points-to set. */
bool (*same_points_to_set) (struct tree_alias_ops *, alias_var,
alias_var);
/* Determine if the alias variable has an empty points-to set. */
bool (*empty_points_to_set) (struct tree_alias_ops *, alias_var);
/* Private data. */
void *data;
/* Interprocedural. */
unsigned int ip:1;
/* Can do conservative interprocedural analysis if we save the
* info. */
unsigned int ip_partial:1;
};
extern struct tree_alias_ops *current_alias_ops;
extern void init_alias_vars (void);
extern bool ptr_may_alias_var (tree, tree);
extern bool same_points_to_set (tree, tree);
extern bool empty_points_to_set (tree);
extern const char *alias_get_name (tree);
#endif /* TREE_ALIAS_COMMON */
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