124 lines
4.4 KiB
C
124 lines
4.4 KiB
C
/* 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 */
|