Move SSA_NAME annotations into tree_ssa_name.

	* tree-dfa.c (create_ssa_name_ann): Remove.
	* tree-flow-inline.h (ssa_name_ann, get_ssa_name_ann): Remove.
	* tree-flow.h (enum tree_ann_type): Remove SSA_NAME_ANN.
	(struct ssa_name_ann_d): Remove.
	(union tree_ann_d): Update.
	(ssa_name_ann_t): Remove.
	* tree-ssa-alias.c: (get_ptr_info): New local function.
	Replace references to ssa_name_ann_t with struct ptr_info_def.
	* tree-ssa-operands.c (get_expr_operands): Likewise.
	* tree.h (SSA_NAME_PTR_INFO): Define.
	(struct ptr_info_def): Declare.
	(struct tree_ssa_name): Add field 'ptr_info'.

From-SVN: r82864

gcc/ChangeLog

+2004-06-09  Diego Novillo  <dnovillo@redhat.com>
+
+	Move SSA_NAME annotations into tree_ssa_name.
+
+	* tree-dfa.c (create_ssa_name_ann): Remove.
+	* tree-flow-inline.h (ssa_name_ann, get_ssa_name_ann): Remove.
+	* tree-flow.h (enum tree_ann_type): Remove SSA_NAME_ANN.
+	(struct ssa_name_ann_d): Remove.
+	(union tree_ann_d): Update.
+	(ssa_name_ann_t): Remove.
+	* tree-ssa-alias.c: (get_ptr_info): New local function.
+	Replace references to ssa_name_ann_t with struct ptr_info_def.
+	* tree-ssa-operands.c (get_expr_operands): Likewise.
+	* tree.h (SSA_NAME_PTR_INFO): Define.
+	(struct ptr_info_def): Declare.
+	(struct tree_ssa_name): Add field 'ptr_info'.
+
 2004-06-09  Danny Smith  <dannysmith@users.sourceforge.net>
 
 	* config/i386/winnt.c (i386_pe_output_labelref): Correct

gcc/tree-dfa.c

@@ -462,30 +462,6 @@ create_stmt_ann (tree t)
 }
 
 
-/* Create a new annotation for an SSA name T.  */
-
-ssa_name_ann_t
-create_ssa_name_ann (tree t)
-{
-  ssa_name_ann_t ann;
-
-#if defined ENABLE_CHECKING
-  if (t == NULL_TREE
-      || (t->common.ann
-	  && t->common.ann->common.type != SSA_NAME_ANN))
-    abort ();
-#endif
-
-  ann = ggc_alloc (sizeof (*ann));
-  memset ((void *) ann, 0, sizeof (*ann));
-
-  ann->common.type = SSA_NAME_ANN;
-  t->common.ann = (tree_ann) ann;
-
-  return ann;
-}
-
-
 /* Build a temporary.  Make sure and register it to be renamed.  */
 
 tree

gcc/tree-flow-inline.h

@@ -64,27 +64,6 @@ get_stmt_ann (tree stmt)
   return (ann) ? ann : create_stmt_ann (stmt);
 }
 
-static inline ssa_name_ann_t
-ssa_name_ann (tree t)
-{
-#if defined ENABLE_CHECKING
-  if (t == NULL_TREE
-      || TREE_CODE (t) != SSA_NAME
-      || (t->common.ann
-	  && t->common.ann->common.type != SSA_NAME_ANN))
-    abort ();
-#endif
-
-  return (ssa_name_ann_t) t->common.ann;
-}
-
-static inline ssa_name_ann_t
-get_ssa_name_ann (tree var)
-{
-  ssa_name_ann_t ann = ssa_name_ann (var);
-  return (ann) ? ann : create_ssa_name_ann (var);
-}
-
 
 static inline enum tree_ann_type
 ann_type (tree_ann ann)

gcc/tree-flow.h

@@ -40,7 +40,7 @@ typedef struct basic_block_def *basic_block;
 /*---------------------------------------------------------------------------
 		   Tree annotations stored in tree_common.ann
 ---------------------------------------------------------------------------*/
-enum tree_ann_type { TREE_ANN_COMMON, VAR_ANN, STMT_ANN, SSA_NAME_ANN };
+enum tree_ann_type { TREE_ANN_COMMON, VAR_ANN, STMT_ANN };
 
 struct tree_ann_common_d GTY(())
 {
@@ -255,50 +255,21 @@ struct stmt_ann_d GTY(())
 };
 
 
-struct ssa_name_ann_d GTY(())
-{
-  struct tree_ann_common_d common;
-
-  /* Nonzero if points-to analysis couldn't determine where this pointer
-     is pointing to.  */
-  unsigned int pt_anything : 1;
-
-  /* Nonzero if this pointer is the result of a call to malloc.  */
-  unsigned int pt_malloc : 1;
-
-  /* Nonzero if the value of this pointer escapes the current function.  */
-  unsigned int value_escapes_p : 1;
-
-  /* Set of variables that this pointer may point to.  */
-  bitmap pt_vars;
-
-  /* If this pointer has been dereferenced, and points-to information is
-     more precise than type-based aliasing, indirect references to this
-     pointer will be represented by this memory tag, instead of the type
-     tag computed by TBAA.  */
-  tree name_mem_tag;
-};
-
-
 union tree_ann_d GTY((desc ("ann_type ((tree_ann)&%h)")))
 {
   struct tree_ann_common_d GTY((tag ("TREE_ANN_COMMON"))) common;
   struct var_ann_d GTY((tag ("VAR_ANN"))) decl;
   struct stmt_ann_d GTY((tag ("STMT_ANN"))) stmt;
-  struct ssa_name_ann_d GTY((tag ("SSA_NAME_ANN"))) ssa_name;
 };
 
 typedef union tree_ann_d *tree_ann;
 typedef struct var_ann_d *var_ann_t;
 typedef struct stmt_ann_d *stmt_ann_t;
-typedef struct ssa_name_ann_d *ssa_name_ann_t;
 
 static inline var_ann_t var_ann (tree);
 static inline var_ann_t get_var_ann (tree);
 static inline stmt_ann_t stmt_ann (tree);
 static inline stmt_ann_t get_stmt_ann (tree);
-static inline ssa_name_ann_t ssa_name_ann (tree);
-static inline ssa_name_ann_t get_ssa_name_ann (tree);
 static inline enum tree_ann_type ann_type (tree_ann);
 static inline basic_block bb_for_stmt (tree);
 extern void set_bb_for_stmt (tree, basic_block);
@@ -487,7 +458,6 @@ extern void dump_generic_bb (FILE *, basic_block, int, int);
 /* In tree-dfa.c  */
 extern var_ann_t create_var_ann (tree);
 extern stmt_ann_t create_stmt_ann (tree);
-extern ssa_name_ann_t create_ssa_name_ann (tree);
 extern tree create_phi_node (tree, basic_block);
 extern void add_phi_arg (tree *, tree, edge);
 extern void remove_phi_arg (tree, basic_block);

gcc/tree-ssa-alias.c

@@ -155,6 +155,7 @@ static void collect_points_to_info_for (struct alias_info *, tree);
 static bool ptr_is_dereferenced_by (tree, tree, bool *);
 static void maybe_create_global_var (struct alias_info *ai);
 static void group_aliases (struct alias_info *);
+static struct ptr_info_def *get_ptr_info (tree t);
 
 /* Global declarations.  */
 
@@ -427,7 +428,7 @@ collect_points_to_info_for (struct alias_info *ai, tree ptr)
 
   if (!bitmap_bit_p (ai->ssa_names_visited, SSA_NAME_VERSION (ptr)))
     {
-      ssa_name_ann_t ann;
+      struct ptr_info_def *pi;
 
       bitmap_set_bit (ai->ssa_names_visited, SSA_NAME_VERSION (ptr));
       walk_use_def_chains (ptr, collect_points_to_info_r, ai);
@@ -436,11 +437,11 @@ collect_points_to_info_for (struct alias_info *ai, tree ptr)
 
       /* If we could not determine where PTR was pointing to, clear all the
 	 other points-to information.  */
-      ann = ssa_name_ann (ptr);
-      if (ann->pt_anything)
+      pi = SSA_NAME_PTR_INFO (ptr);
+      if (pi->pt_anything)
 	{
-	  ann->pt_malloc = 0;
-	  ann->pt_vars = NULL;
+	  pi->pt_malloc = 0;
+	  pi->pt_vars = NULL;
 	}
     }
 }
@@ -559,12 +560,13 @@ compute_points_to_and_addr_escape (struct alias_info *ai)
 	  if (stmt_escapes_p)
 	    block_ann->has_escape_site = 1;
 
-	  /* Special case for silly ADDR_EXPR tricks.  If this
-	     statement is an assignment to a non-pointer variable and
-	     the RHS takes the address of a variable, assume that the
-	     variable on the RHS is call-clobbered.  We could add the
-	     LHS to the list of "pointers" and follow it to see if it
-	     really escapes, but it's not worth the pain.  */
+	  /* Special case for silly ADDR_EXPR tricks
+	     (gcc.c-torture/unsorted/pass.c).  If this statement is an
+	     assignment to a non-pointer variable and the RHS takes the
+	     address of a variable, assume that the variable on the RHS is
+	     call-clobbered.  We could add the LHS to the list of
+	     "pointers" and follow it to see if it really escapes, but it's
+	     not worth the pain.  */
 	  if (addr_taken
 	      && TREE_CODE (stmt) == MODIFY_EXPR
 	      && !POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (stmt, 0))))
@@ -580,7 +582,7 @@ compute_points_to_and_addr_escape (struct alias_info *ai)
 	    {
 	      tree op = USE_OP (uses, i);
 	      var_ann_t v_ann = var_ann (SSA_NAME_VAR (op));
-	      ssa_name_ann_t ptr_ann;
+	      struct ptr_info_def *pi;
 	      bool is_store;
 
 	      /* If the operand's variable may be aliased, keep track
@@ -598,7 +600,7 @@ compute_points_to_and_addr_escape (struct alias_info *ai)
 
 	      collect_points_to_info_for (ai, op);
 
-	      ptr_ann = ssa_name_ann (op);
+	      pi =  SSA_NAME_PTR_INFO (op);
 	      if (ptr_is_dereferenced_by (op, stmt, &is_store))
 		{
 		  /* If we found OP to point to a set of variables or
@@ -609,8 +611,8 @@ compute_points_to_and_addr_escape (struct alias_info *ai)
 		     FIXME: Cycles in the SSA web and the lack of SSA 
 		     information for structures will prevent the creation
 		     of name tags.  Find ways around this limitation.  */
-		  if (ptr_ann->pt_malloc || ptr_ann->pt_vars)
-		    ptr_ann->name_mem_tag = get_nmt_for (op);
+		  if (pi->pt_malloc || pi->pt_vars)
+		    pi->name_mem_tag = get_nmt_for (op);
 
 		  /* Keep track of how many time we've dereferenced each
 		     pointer.  Again, we don't need to grow
@@ -632,7 +634,7 @@ compute_points_to_and_addr_escape (struct alias_info *ai)
 		     will not escape if it is being dereferenced.  That's
 		     why we only check for escape points if OP is not
 		     dereferenced by STMT.  */
-		  ptr_ann->value_escapes_p = 1;
+		  pi->value_escapes_p = 1;
 
 		  /* If the statement makes a function call, assume
 		     that pointer OP will be dereferenced in a store
@@ -695,15 +697,15 @@ compute_flow_sensitive_aliasing (struct alias_info *ai)
     {
       size_t j;
       tree ptr = VARRAY_TREE (ai->processed_ptrs, i);
-      ssa_name_ann_t ann = ssa_name_ann (ptr);
+      struct ptr_info_def *pi = SSA_NAME_PTR_INFO (ptr);
       var_ann_t v_ann = var_ann (SSA_NAME_VAR (ptr));
 
-      if (ann->value_escapes_p || ann->pt_anything)
+      if (pi->value_escapes_p || pi->pt_anything)
 	{
 	  /* If PTR escapes or may point to anything, then its associated
 	     memory tags are call-clobbered.  */
-	  if (ann->name_mem_tag)
-	    mark_call_clobbered (ann->name_mem_tag);
+	  if (pi->name_mem_tag)
+	    mark_call_clobbered (pi->name_mem_tag);
 
 	  if (v_ann->type_mem_tag)
 	    mark_call_clobbered (v_ann->type_mem_tag);
@@ -711,7 +713,7 @@ compute_flow_sensitive_aliasing (struct alias_info *ai)
 	  /* If PTR may point to anything, mark call-clobbered all the
 	     addressables with the same alias set as the type pointed-to by
 	     PTR.  */
-	  if (ann->pt_anything)
+	  if (pi->pt_anything)
 	    {
 	      HOST_WIDE_INT ptr_set;
 	      ptr_set = get_alias_set (TREE_TYPE (TREE_TYPE (ptr)));
@@ -730,23 +732,25 @@ compute_flow_sensitive_aliasing (struct alias_info *ai)
 	     name memory tag, which will have been marked call-clobbered.
 	     This will in turn mark the pointed-to variables as
 	     call-clobbered when we call add_may_alias below.  */
-	  if (ann->value_escapes_p && !ann->name_mem_tag && ann->pt_vars)
-	    EXECUTE_IF_SET_IN_BITMAP (ann->pt_vars, 0, j,
+	  if (pi->value_escapes_p
+	      && pi->name_mem_tag == NULL_TREE
+	      && pi->pt_vars)
+	    EXECUTE_IF_SET_IN_BITMAP (pi->pt_vars, 0, j,
 		mark_call_clobbered (referenced_var (j)));
 	}
 
       /* Set up aliasing information for PTR's name memory tag (if it has
 	 one).  Note that only pointers that have been dereferenced will
 	 have a name memory tag.  */
-      if (ann->name_mem_tag && ann->pt_vars)
-	EXECUTE_IF_SET_IN_BITMAP (ann->pt_vars, 0, j,
-	    add_may_alias (ann->name_mem_tag, referenced_var (j)));
+      if (pi->name_mem_tag && pi->pt_vars)
+	EXECUTE_IF_SET_IN_BITMAP (pi->pt_vars, 0, j,
+	    add_may_alias (pi->name_mem_tag, referenced_var (j)));
 
       /* If the name tag is call clobbered, so is the type tag
 	 associated with the base VAR_DECL.  */
-      if (ann->name_mem_tag
+      if (pi->name_mem_tag
 	  && v_ann->type_mem_tag
-	  && is_call_clobbered (ann->name_mem_tag))
+	  && is_call_clobbered (pi->name_mem_tag))
 	mark_call_clobbered (v_ann->type_mem_tag);
     }
 }
@@ -1050,7 +1054,7 @@ group_aliases (struct alias_info *ai)
     {
       size_t j;
       tree ptr = VARRAY_TREE (ai->processed_ptrs, i);
-      tree name_tag = ssa_name_ann (ptr)->name_mem_tag;
+      tree name_tag = SSA_NAME_PTR_INFO (ptr)->name_mem_tag;
       varray_type aliases;
       
       if (name_tag == NULL_TREE)
@@ -1509,30 +1513,30 @@ add_may_alias (tree var, tree alias)
 static void
 merge_pointed_to_info (struct alias_info *ai, tree dest, tree orig)
 {
-  ssa_name_ann_t dest_ann, orig_ann;
+  struct ptr_info_def *dest_pi, *orig_pi;
 
   /* Make sure we have points-to information for ORIG.  */
   collect_points_to_info_for (ai, orig);
 
-  dest_ann = get_ssa_name_ann (dest);
-  orig_ann = ssa_name_ann (orig);
+  dest_pi = get_ptr_info (dest);
+  orig_pi = SSA_NAME_PTR_INFO (orig);
 
-  if (orig_ann)
+  if (orig_pi)
     {
-      dest_ann->pt_anything |= orig_ann->pt_anything;
-      dest_ann->pt_malloc |= orig_ann->pt_malloc;
+      dest_pi->pt_anything |= orig_pi->pt_anything;
+      dest_pi->pt_malloc |= orig_pi->pt_malloc;
 
-      if (orig_ann->pt_vars)
+      if (orig_pi->pt_vars)
 	{
-	  if (dest_ann->pt_vars == NULL)
+	  if (dest_pi->pt_vars == NULL)
 	    {
-	      dest_ann->pt_vars = BITMAP_GGC_ALLOC ();
-	      bitmap_copy (dest_ann->pt_vars, orig_ann->pt_vars);
+	      dest_pi->pt_vars = BITMAP_GGC_ALLOC ();
+	      bitmap_copy (dest_pi->pt_vars, orig_pi->pt_vars);
 	    }
 	  else
-	    bitmap_a_or_b (dest_ann->pt_vars,
-			   dest_ann->pt_vars,
-			   orig_ann->pt_vars);
+	    bitmap_a_or_b (dest_pi->pt_vars,
+			   dest_pi->pt_vars,
+			   orig_pi->pt_vars);
       }
     }
 }
@@ -1543,7 +1547,7 @@ merge_pointed_to_info (struct alias_info *ai, tree dest, tree orig)
 static void
 add_pointed_to_expr (tree ptr, tree value)
 {
-  ssa_name_ann_t ann;
+  struct ptr_info_def *pi;
 
 #if defined ENABLE_CHECKING
   /* Pointer variables should have been handled by merge_pointed_to_info.  */
@@ -1552,22 +1556,22 @@ add_pointed_to_expr (tree ptr, tree value)
     abort ();
 #endif
 
-  ann = get_ssa_name_ann (ptr);
+  pi = get_ptr_info (ptr);
 
   /* If VALUE is the result of a malloc-like call, then the area pointed to
      PTR is guaranteed to not alias with anything else.  */
   if (TREE_CODE (value) == CALL_EXPR
       && (call_expr_flags (value) & (ECF_MALLOC | ECF_MAY_BE_ALLOCA)))
-    ann->pt_malloc = 1;
+    pi->pt_malloc = 1;
   else
-    ann->pt_anything = 1;
+    pi->pt_anything = 1;
 
   if (dump_file)
     {
       fprintf (dump_file, "Pointer ");
       print_generic_expr (dump_file, ptr, dump_flags);
       fprintf (dump_file, " points to ");
-      if (ann->pt_malloc)
+      if (pi->pt_malloc)
 	fprintf (dump_file, "malloc space: ");
       else
 	fprintf (dump_file, "an arbitrary address: ");
@@ -1587,7 +1591,7 @@ add_pointed_to_var (struct alias_info *ai, tree ptr, tree value)
   if (TREE_CODE (value) == ADDR_EXPR)
     {
       tree pt_var;
-      ssa_name_ann_t ann;
+      struct ptr_info_def *pi;
       size_t uid;
 
       pt_var = TREE_OPERAND (value, 0);
@@ -1596,11 +1600,11 @@ add_pointed_to_var (struct alias_info *ai, tree ptr, tree value)
 
       if (pt_var && SSA_VAR_P (pt_var))
 	{
-	  ann = get_ssa_name_ann (ptr);
+	  pi = get_ptr_info (ptr);
 	  uid = var_ann (pt_var)->uid;
-	  if (ann->pt_vars == NULL)
-	    ann->pt_vars = BITMAP_GGC_ALLOC ();
-	  bitmap_set_bit (ann->pt_vars, uid);
+	  if (pi->pt_vars == NULL)
+	    pi->pt_vars = BITMAP_GGC_ALLOC ();
+	  bitmap_set_bit (pi->pt_vars, uid);
 	  bitmap_set_bit (ai->addresses_needed, uid);
 	}
       else
@@ -1675,8 +1679,7 @@ collect_points_to_info_r (tree var, tree stmt, void *data)
   else if (TREE_CODE (stmt) == ASM_EXPR)
     {
       /* Pointers defined by __asm__ statements can point anywhere.  */
-      ssa_name_ann_t ann = get_ssa_name_ann (var);
-      ann->pt_anything = 1;
+      get_ptr_info (var)->pt_anything = 1;
     }
   else if (IS_EMPTY_STMT (stmt))
     {
@@ -1810,8 +1813,8 @@ create_memory_tag (tree type, bool is_type_tag)
 static tree
 get_nmt_for (tree ptr)
 {
-  ssa_name_ann_t ptr_ann = ssa_name_ann (ptr);
-  tree tag = ptr_ann->name_mem_tag;
+  struct ptr_info_def *pi = get_ptr_info (ptr);
+  tree tag = pi->name_mem_tag;
 
   if (tag == NULL_TREE)
     {
@@ -1823,7 +1826,7 @@ get_nmt_for (tree ptr)
 	mark_call_clobbered (tag);
 
       /* Similarly, if PTR points to malloc, then TAG is a global.  */
-      if (ptr_ann->pt_malloc)
+      if (pi->pt_malloc)
 	mark_call_clobbered (tag);
     }
 
@@ -1976,40 +1979,65 @@ debug_alias_info (void)
 }
 
 
+/* Return the alias information associated with pointer T.  It creates a
+   new instance if none existed.  */
+
+static struct ptr_info_def *
+get_ptr_info (tree t)
+{
+  struct ptr_info_def *pi;
+
+#if defined ENABLE_CHECKING
+  if (!POINTER_TYPE_P (TREE_TYPE (t)))
+    abort ();
+#endif
+
+  pi = SSA_NAME_PTR_INFO (t);
+  if (pi == NULL)
+    {
+      pi = ggc_alloc (sizeof (*pi));
+      memset ((void *)pi, 0, sizeof (*pi));
+      SSA_NAME_PTR_INFO (t) = pi;
+    }
+
+  return pi;
+}
+
+
 /* Dump points-to information for SSA_NAME PTR into FILE.  */
 
 static void
 dump_points_to_info_for (FILE *file, tree ptr)
 {
-  ssa_name_ann_t ann = ssa_name_ann (ptr);
+  struct ptr_info_def *pi = SSA_NAME_PTR_INFO (ptr);
 
   fprintf (file, "Pointer ");
   print_generic_expr (file, ptr, dump_flags);
 
-  if (ann == NULL)
+  if (pi == NULL)
     return;
 
-  if (ann->name_mem_tag)
+  if (pi->name_mem_tag)
     {
       fprintf (file, ", name memory tag: ");
-      print_generic_expr (file, ann->name_mem_tag, dump_flags);
+      print_generic_expr (file, pi->name_mem_tag, dump_flags);
     }
 
-  if (ann->value_escapes_p)
+  if (pi->value_escapes_p)
     fprintf (file, ", its value escapes");
 
-  if (ann->pt_anything)
+  if (pi->pt_anything)
     fprintf (file, ", points-to anything");
 
-  if (ann->pt_malloc)
+  if (pi->pt_malloc)
     fprintf (file, ", points-to malloc");
 
-  if (ann->pt_vars)
+  if (pi->pt_vars)
     {
       unsigned ix;
 
       fprintf (file, ", points-to vars: { ");
-      EXECUTE_IF_SET_IN_BITMAP (ann->pt_vars, 0, ix,
+      EXECUTE_IF_SET_IN_BITMAP (pi->pt_vars, 0, ix,
 	  {
 	    print_generic_expr (file, referenced_var (ix), dump_flags);
 	    fprintf (file, " ");

gcc/tree-ssa-operands.c

@@ -886,16 +886,16 @@ get_expr_operands (tree stmt, tree *expr_p, int flags, voperands_t prev_vops)
 	    }
 	  else
 	    {
-	      ssa_name_ann_t ptr_ann = NULL;
+	      struct ptr_info_def *pi = NULL;
 
 	      /* If we have computed aliasing already, check if PTR has
 		 flow-sensitive points-to information.  */
 	      if (TREE_CODE (ptr) == SSA_NAME
-		  && (ptr_ann = ssa_name_ann (ptr)) != NULL
-		  && ptr_ann->name_mem_tag)
+		  && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL
+		  && pi->name_mem_tag)
 		{
 		  /* PTR has its own memory tag.  Use it.  */
-		  add_stmt_operand (&ptr_ann->name_mem_tag, stmt, flags,
+		  add_stmt_operand (&pi->name_mem_tag, stmt, flags,
 		                    prev_vops);
 		}
 	      else
@@ -910,7 +910,7 @@ get_expr_operands (tree stmt, tree *expr_p, int flags, voperands_t prev_vops)
 		     aliasing again.  */
 		  if (dump_file
 		      && TREE_CODE (ptr) == SSA_NAME
-		      && ptr_ann == NULL)
+		      && pi == NULL)
 		    {
 		      fprintf (dump_file,
 			  "NOTE: no flow-sensitive alias info for ");

gcc/tree.h

@@ -1174,12 +1174,43 @@ struct tree_exp GTY(())
 #define SSA_NAME_OCCURS_IN_ABNORMAL_PHI(NODE) \
     SSA_NAME_CHECK (NODE)->common.asm_written_flag
 
-/* Nonzero if this SSA_NAME expression is currently on the freelist of
+/* Nonzero if this SSA_NAME expression is currently on the free list of
    SSA_NAMES.  Using NOTHROW_FLAG seems reasonably safe since throwing
    has no meaning for an SSA_NAME.  */
 #define SSA_NAME_IN_FREE_LIST(NODE) \
     SSA_NAME_CHECK (NODE)->common.nothrow_flag
 
+/* Attributes for SSA_NAMEs for pointer-type variables.  */
+#define SSA_NAME_PTR_INFO(N) \
+    SSA_NAME_CHECK (N)->ssa_name.ptr_info
+
+#ifndef GCC_BITMAP_H
+struct bitmap_head_def;
+#endif
+
+/* Aliasing information for SSA_NAMEs representing pointer variables.  */
+struct ptr_info_def GTY(())
+{
+  /* Nonzero if points-to analysis couldn't determine where this pointer
+     is pointing to.  */
+  unsigned int pt_anything : 1;
+
+  /* Nonzero if this pointer is the result of a call to malloc.  */
+  unsigned int pt_malloc : 1;
+
+  /* Nonzero if the value of this pointer escapes the current function.  */
+  unsigned int value_escapes_p : 1;
+
+  /* Set of variables that this pointer may point to.  */
+  struct bitmap_head_def *pt_vars;
+
+  /* If this pointer has been dereferenced, and points-to information is
+     more precise than type-based aliasing, indirect references to this
+     pointer will be represented by this memory tag, instead of the type
+     tag computed by TBAA.  */
+  tree name_mem_tag;
+};
+
 struct tree_ssa_name GTY(())
 {
   struct tree_common common;
@@ -1189,6 +1220,9 @@ struct tree_ssa_name GTY(())
 
   /* SSA version number.  */
   unsigned int version;
+
+  /* Pointer attributes used for alias analysis.  */
+  struct ptr_info_def *ptr_info;
 };
 
 /* In a PHI_NODE node.  */