merge with trunk

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/profile-stdlib@147924 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 110 insertions, 0 deletions

diff --git a/gcc/tree-ssa-alias.h b/gcc/tree-ssa-alias.h
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+++ b/gcc/tree-ssa-alias.h
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+/* Tree based alias analysis and alias oracle.
+   Copyright (C) 2008 Free Software Foundation, Inc.
+   Contributed by Richard Guenther  <rguenther@suse.de>
+
+   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 3 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; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef TREE_SSA_ALIAS_H
+#define TREE_SSA_ALIAS_H
+
+#include "coretypes.h"
+
+
+/* The reasons a variable may escape a function.  */
+enum escape_type 
+{
+  NO_ESCAPE = 0,			/* Doesn't escape.  */
+  ESCAPE_STORED_IN_GLOBAL = 1 << 0,
+  ESCAPE_TO_ASM = 1 << 1,		/* Passed by address to an assembly
+					   statement.  */
+  ESCAPE_TO_CALL = 1 << 2,		/* Escapes to a function call.  */
+  ESCAPE_BAD_CAST = 1 << 3,		/* Cast from pointer to integer */
+  ESCAPE_TO_RETURN = 1 << 4,		/* Returned from function.  */
+  ESCAPE_TO_PURE_CONST = 1 << 5,	/* Escapes to a pure or constant
+					   function call.  */
+  ESCAPE_IS_GLOBAL = 1 << 6,		/* Is a global variable.  */
+  ESCAPE_IS_PARM = 1 << 7,		/* Is an incoming function argument.  */
+  ESCAPE_UNKNOWN = 1 << 8		/* We believe it escapes for
+					   some reason not enumerated
+					   above.  */
+};
+
+
+/* The points-to solution.
+
+   The points-to solution is a union of pt_vars and the abstract
+   sets specified by the flags.  */
+struct GTY(()) pt_solution
+{
+  /* Nonzero if points-to analysis couldn't determine where this pointer
+     is pointing to.  */
+  unsigned int anything : 1;
+
+  /* Nonzero if the points-to set includes any global memory.  Note that
+     even if this is zero pt_vars can still include global variables.  */
+  unsigned int nonlocal : 1;
+
+  /* Nonzero if the points-to set includes any escaped local variable.  */
+  unsigned int escaped : 1;
+
+  /* Nonzero if the points-to set includes 'nothing', the points-to set
+     includes memory at address NULL.  */
+  unsigned int null : 1;
+
+
+  /* Nonzero if the pt_vars bitmap includes a global variable.  */
+  unsigned int vars_contains_global : 1;
+
+  /* Set of variables that this pointer may point to.  */
+  bitmap vars;
+};
+
+
+/* In tree-ssa-alias.c  */
+extern enum escape_type is_escape_site (gimple);
+extern bool ptr_deref_may_alias_global_p (tree);
+extern bool refs_may_alias_p (tree, tree);
+extern bool refs_anti_dependent_p (tree, tree);
+extern bool refs_output_dependent_p (tree, tree);
+extern bool ref_maybe_used_by_stmt_p (gimple, tree);
+extern bool stmt_may_clobber_ref_p (gimple, tree);
+extern void *walk_non_aliased_vuses (tree, tree,
+				     void *(*)(tree, tree, void *),
+				     void *(*)(tree *, tree, void *), void *);
+extern unsigned int walk_aliased_vdefs (tree, tree,
+					bool (*)(tree, tree, void *), void *,
+					bitmap *);
+extern struct ptr_info_def *get_ptr_info (tree);
+extern void dump_alias_info (FILE *);
+extern void debug_alias_info (void);
+extern void dump_points_to_solution (FILE *, struct pt_solution *);
+extern void dump_points_to_info_for (FILE *, tree);
+extern void debug_points_to_info_for (tree);
+extern void dump_alias_stats (FILE *);
+
+
+/* In tree-ssa-structalias.c  */
+extern unsigned int compute_may_aliases (void);
+extern void delete_alias_heapvars (void);
+extern bool pt_solution_includes_global (struct pt_solution *);
+extern bool pt_solution_includes (struct pt_solution *, const_tree);
+extern bool pt_solutions_intersect (struct pt_solution *, struct pt_solution *);
+extern void pt_solution_reset (struct pt_solution *);
+extern void dump_pta_stats (FILE *);
+
+
+#endif /* TREE_SSA_ALIAS_H  */