c-common.c (finish_label_expr): New function, lifted from from cp/semantics.c.

	* c-common.c (finish_label_expr): New function, lifted from
	from cp/semantics.c.
	* c-common.h (finish_label_expr, lookup_label): New prototypes.
	* c-parse.in: Move 3 blocks of parser code into new functions.
	* c-typeck.c (simple_asm_stmt, c_cast_expr): New functions.
	* c-tree.h (simple_asm_stmt, c_cast_expr): New prototypes.
	(lookup_label): Remove.

From-SVN: r41959

gcc/ChangeLog

+2001-05-11  Neil Booth  <neil@daikokuya.demon.co.uk>
+
+	* c-common.c (finish_label_expr): New function, lifted from
+	from cp/semantics.c.
+	* c-common.h (finish_label_expr, lookup_label): New prototypes.
+	* c-parse.in: Move 3 blocks of parser code into new functions.
+	* c-typeck.c (simple_asm_stmt, c_cast_expr): New functions.
+	* c-tree.h (simple_asm_stmt, c_cast_expr): New prototypes.
+	(lookup_label): Remove.
+
 2001-05-11  Alexandre Oliva  <aoliva@redhat.com>
 
 	* config/mn10300/t-mn10300 (dp-bit.c, fp-bit.c): Don't define

gcc/c-common.c

@@ -4193,6 +4193,39 @@ c_add_case_label (cases, cond, low_value, high_value)
   return case_label;
 }
 
+/* Finish an expression taking the address of LABEL.  Returns an
+   expression for the address.  */
+
+tree 
+finish_label_address_expr (label)
+     tree label;
+{
+  tree result;
+
+  if (pedantic)
+    {
+      if (c_language == clk_cplusplus)
+	pedwarn ("ISO C++ forbids taking the address of a label");
+      else
+	pedwarn ("ISO C forbids taking the address of a label");
+    }
+
+  label = lookup_label (label);
+  if (label == NULL_TREE)
+    result = null_pointer_node;
+  else
+    {
+      TREE_USED (label) = 1;
+      result = build1 (ADDR_EXPR, ptr_type_node, label);
+      TREE_CONSTANT (result) = 1;
+      /* The current function in not necessarily uninlinable.
+	 Computed gotos are incompatible with inlining, but the value
+	 here could be used only in a diagnostic, for example.  */
+    }
+
+  return result;
+}
+
 /* Mark P (a stmt_tree) for GC.  The use of a `void *' for the
    parameter allows this function to be used as a GC-marking
    function.  */

gcc/c-common.h

@@ -783,6 +783,12 @@ extern tree c_add_case_label                    PARAMS ((splay_tree,
 
 extern tree build_function_call			PARAMS ((tree, tree));
 
+extern tree finish_label_address_expr		PARAMS ((tree));
+
+/* Same function prototype, but the C and C++ front ends have
+   different implementations.  Used in c-common.c.  */
+extern tree lookup_label			PARAMS ((tree));
+
 /* If this variable is defined to a non-NULL value, it will be called
    after the file has been completely parsed.  The argument will be
    the GLOBAL_NAMESPACE in C++, or the list of top-level declarations

gcc/c-parse.in

@@ -493,18 +493,7 @@ unary_expr:
 		  overflow_warning ($$); }
 	/* Refer to the address of a label as a pointer.  */
 	| ANDAND identifier
-		{ tree label = lookup_label ($2);
-		  if (pedantic)
-		    pedwarn ("ISO C forbids `&&'");
-		  if (label == 0)
-		    $$ = null_pointer_node;
-		  else
-		    {
-		      TREE_USED (label) = 1;
-		      $$ = build1 (ADDR_EXPR, ptr_type_node, label);
-		      TREE_CONSTANT ($$) = 1;
-		    }
-		}
+		{ $$ = finish_label_address_expr ($2); }
 /* This seems to be impossible on some machines, so let's turn it off.
    You can use __builtin_next_arg to find the anonymous stack args.
 	| '&' ELLIPSIS
@@ -552,15 +541,7 @@ alignof:
 cast_expr:
 	unary_expr
 	| '(' typename ')' cast_expr  %prec UNARY
-		{ tree type;
-		  int SAVED_warn_strict_prototypes = warn_strict_prototypes;
-		  /* This avoids warnings about unprototyped casts on
-                     integers.  E.g. "#define SIG_DFL (void(*)())0".  */
-		  if (TREE_CODE ($4) == INTEGER_CST)
-		    warn_strict_prototypes = 0;
-		  type = groktypename ($2);
-		  warn_strict_prototypes = SAVED_warn_strict_prototypes;
-		  $$ = build_c_cast (type, $4); }
+		{ $$ = c_cast_expr ($2, $4); }
 	;
 
 expr_no_commas:
@@ -2401,26 +2382,7 @@ stmt:
 		  $$ = c_expand_return ($2); }
 	| ASM_KEYWORD maybe_type_qual '(' expr ')' ';'
 		{ stmt_count++;
-		  STRIP_NOPS ($4);
-		  if ((TREE_CODE ($4) == ADDR_EXPR
-		       && TREE_CODE (TREE_OPERAND ($4, 0)) == STRING_CST)
-		      || TREE_CODE ($4) == STRING_CST)
-		    {
-		      if (TREE_CODE ($4) == ADDR_EXPR)
-			$4 = TREE_OPERAND ($4, 0);
-		      if (TREE_CHAIN ($4))
-			$4 = combine_strings ($4);
-		      $$ = add_stmt (build_stmt (ASM_STMT, NULL_TREE, $4,
-						 NULL_TREE, NULL_TREE,
-						 NULL_TREE));
-		      ASM_INPUT_P ($$) = 1;
-		    }
-		  else
-		    {
-		      error ("argument of `asm' is not a constant string");
-		      $$ = NULL_TREE;
-		    }
-		}
+		  $$ = simple_asm_stmt ($4); }
 	/* This is the case with just output operands.  */
 	| ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ')' ';'
 		{ stmt_count++;

gcc/c-tree.h

@@ -187,7 +187,6 @@ extern void implicit_decl_warning               PARAMS ((tree));
 extern int  in_parm_level_p                     PARAMS ((void));
 extern void keep_next_level                     PARAMS ((void));
 extern int  kept_level_p                        PARAMS ((void));
-extern tree lookup_label                        PARAMS ((tree));
 extern tree lookup_name                         PARAMS ((tree));
 extern tree lookup_name_current_level		PARAMS ((tree));
 extern tree lookup_name_current_level_global	PARAMS ((tree));
@@ -233,6 +232,7 @@ extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 extern void readonly_warning			PARAMS ((tree, const char *));
 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 extern tree build_compound_expr                 PARAMS ((tree));
+extern tree c_cast_expr				PARAMS ((tree, tree));
 extern tree build_c_cast	                PARAMS ((tree, tree));
 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 							 tree));
@@ -251,6 +251,7 @@ extern void pedwarn_c99				PARAMS ((const char *, ...))
 							ATTRIBUTE_PRINTF_1;
 extern tree c_start_case                        PARAMS ((tree));
 extern void c_finish_case                       PARAMS ((void));
+extern tree simple_asm_stmt			PARAMS ((tree));
 extern tree build_asm_stmt			PARAMS ((tree, tree, tree,
 							 tree, tree));
 

gcc/c-typeck.c

@@ -3868,6 +3868,24 @@ build_c_cast (type, expr)
   return value;
 }
 
+/* Interpret a cast of expression EXPR to type TYPE.  */
+tree
+c_cast_expr (type, expr)
+     tree type, expr;
+{
+  int saved_wsp = warn_strict_prototypes;
+
+  /* This avoids warnings about unprototyped casts on
+     integers.  E.g. "#define SIG_DFL (void(*)())0".  */
+  if (TREE_CODE (expr) == INTEGER_CST)
+    warn_strict_prototypes = 0;
+  type = groktypename (type);
+  warn_strict_prototypes = saved_wsp;
+
+  return build_c_cast (type, expr);
+}
+
+
 /* Build an assignment expression of lvalue LHS from value RHS.
    MODIFYCODE is the code for a binary operator that we use
    to combine the old value of LHS with RHS to get the new value.
@@ -6763,6 +6781,33 @@ process_init_element (value)
   constructor_range_stack = 0;
 }
 
+/* Build a simple asm-statement, from one string literal.  */
+tree
+simple_asm_stmt (expr)
+     tree expr;
+{
+  STRIP_NOPS (expr);
+
+  if (TREE_CODE (expr) == ADDR_EXPR)
+    expr = TREE_OPERAND (expr, 0);
+
+  if (TREE_CODE (expr) == STRING_CST)
+    {
+      tree stmt;
+
+      if (TREE_CHAIN (expr))
+	expr = combine_strings (expr);
+      stmt = add_stmt (build_stmt (ASM_STMT, NULL_TREE, expr,
+				   NULL_TREE, NULL_TREE,
+				   NULL_TREE));
+      ASM_INPUT_P (stmt) = 1;
+      return stmt;
+    }
+
+  error ("argument of `asm' is not a constant string");
+  return NULL_TREE;
+}
+
 /* Build an asm-statement, whose components are a CV_QUALIFIER, a
    STRING, some OUTPUTS, some INPUTS, and some CLOBBERS.  */