tree.c (staticp): Return the static object.

        * tree.c (staticp): Return the static object.
        * tree.h (staticp): Update decl.
        * langhooks.h (struct lang_hooks): Change staticp return type to tree.
        * langhooks.c (lhd_staticp): Return NULL_TREE.
        * langhooks-def.h (lhd_staticp): Update decl.
        * c-common.c (c_staticp): Return the static object.
        * c-common.h (c_staticp): Update decl.

From-SVN: r86650

gcc/ChangeLog

 2004-08-26  Richard Henderson  <rth@redhat.com>
 
+	* tree.c (staticp): Return the static object.
+	* tree.h (staticp): Update decl.
+	* langhooks.h (struct lang_hooks): Change staticp return type to tree.
+	* langhooks.c (lhd_staticp): Return NULL_TREE.
+	* langhooks-def.h (lhd_staticp): Update decl.
+	* c-common.c (c_staticp): Return the static object.
+	* c-common.h (c_staticp): Update decl.
+
+2004-08-26  Richard Henderson  <rth@redhat.com>
+
 	* config/alpha/alpha.h (HARD_REGNO_MODE_OK): Allow complex float
 	modes.
 

gcc/c-common.c

@@ -3828,13 +3828,12 @@ c_expand_expr (tree exp, rtx target, enum machine_mode tmode,
 
 /* Hook used by staticp to handle language-specific tree codes.  */
 
-bool
+tree
 c_staticp (tree exp)
 {
-  if (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR
-      && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp)))
-    return true;
-  return false;
+  return (TREE_CODE (exp) == COMPOUND_LITERAL_EXPR
+	  && TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (exp))
+	  ? exp : NULL);
 }
 
 

gcc/c-common.h

@@ -840,7 +840,7 @@ extern int vector_types_convertible_p (tree t1, tree t2);
 
 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 
-extern bool c_staticp (tree);
+extern tree c_staticp (tree);
 
 extern int c_common_unsafe_for_reeval (tree);
 

gcc/langhooks-def.h

@@ -50,7 +50,7 @@ extern tree lhd_return_null_tree_v (void);
 extern tree lhd_return_null_tree (tree);
 extern tree lhd_do_nothing_iii_return_null_tree (int, int, int);
 extern int lhd_safe_from_p (rtx, tree);
-extern bool lhd_staticp (tree);
+extern tree lhd_staticp (tree);
 extern void lhd_print_tree_nothing (FILE *, tree, int);
 extern const char *lhd_decl_printable_name (tree, int);
 extern int lhd_types_compatible_p (tree, tree);

gcc/langhooks.c

@@ -125,10 +125,10 @@ lhd_safe_from_p (rtx ARG_UNUSED (x), tree ARG_UNUSED (exp))
 
 /* Called from staticp.  */
 
-bool
+tree
 lhd_staticp (tree ARG_UNUSED (exp))
 {
-  return false;
+  return NULL;
 }
 
 /* Called from check_global_declarations.  */

gcc/langhooks.h

@@ -299,7 +299,7 @@ struct lang_hooks
   bool (*mark_addressable) (tree);
 
   /* Hook called by staticp for language-specific tree codes.  */
-  bool (*staticp) (tree);
+  tree (*staticp) (tree);
 
   /* Replace the DECL_LANG_SPECIFIC data, which may be NULL, of the
      DECL_NODE with a newly GC-allocated copy.  */

gcc/tree.c

@@ -1366,7 +1366,7 @@ array_type_nelts (tree type)
 /* Return true if arg is static -- a reference to an object in
    static storage.  This is not the same as the C meaning of `static'.  */
 
-bool
+tree
 staticp (tree arg)
 {
   switch (TREE_CODE (arg))
@@ -1375,19 +1375,21 @@ staticp (tree arg)
       /* Nested functions aren't static, since taking their address
 	 involves a trampoline.  */
       return ((decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg))
-	      && ! DECL_NON_ADDR_CONST_P (arg));
+	      && ! DECL_NON_ADDR_CONST_P (arg)
+	      ? arg : NULL);
 
     case VAR_DECL:
       return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
 	      && ! DECL_THREAD_LOCAL (arg)
-	      && ! DECL_NON_ADDR_CONST_P (arg));
+	      && ! DECL_NON_ADDR_CONST_P (arg)
+	      ? arg : NULL);
 
     case CONSTRUCTOR:
-      return TREE_STATIC (arg);
+      return TREE_STATIC (arg) ? arg : NULL;
 
     case LABEL_DECL:
     case STRING_CST:
-      return true;
+      return arg;
 
     case COMPONENT_REF:
       /* If the thing being referenced is not a field, then it is
@@ -1398,20 +1400,15 @@ staticp (tree arg)
       /* If we are referencing a bitfield, we can't evaluate an
 	 ADDR_EXPR at compile time and so it isn't a constant.  */
       if (DECL_BIT_FIELD (TREE_OPERAND (arg, 1)))
-	return false;
+	return NULL;
 
       return staticp (TREE_OPERAND (arg, 0));
 
     case BIT_FIELD_REF:
-      return false;
+      return NULL;
 
-#if 0
-       /* This case is technically correct, but results in setting
-	  TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
-	  compile time.  */
     case INDIRECT_REF:
-      return TREE_CONSTANT (TREE_OPERAND (arg, 0));
-#endif
+      return TREE_CONSTANT (TREE_OPERAND (arg, 0)) ? arg : NULL;
 
     case ARRAY_REF:
     case ARRAY_RANGE_REF:
@@ -1426,7 +1423,7 @@ staticp (tree arg)
 	  >= (unsigned int) LAST_AND_UNUSED_TREE_CODE)
 	return lang_hooks.staticp (arg);
       else
-	return false;
+	return NULL;
     }
 }
 

gcc/tree.h

@@ -3184,10 +3184,10 @@ extern int integer_pow2p (tree);
 
 extern int integer_nonzerop (tree);
 
-/* staticp (tree x) is true if X is a reference to data allocated
-   at a fixed address in memory.  */
+/* staticp (tree x) is nonzero if X is a reference to data allocated
+   at a fixed address in memory.  Returns the outermost data.  */
 
-extern bool staticp (tree);
+extern tree staticp (tree);
 
 /* save_expr (EXP) returns an expression equivalent to EXP
    but it can be used multiple times within context CTX