/* This file contains the definitions and documentation for the
additional tree codes used in the Objective C front end (see tree.def
for the standard codes).
- Copyright (C) 1990, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2007
+ Copyright (C) 1990, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2007, 2010
Free Software Foundation, Inc.
This file is part of GCC.
DEFTREECODE (KEYWORD_DECL, "keyword_decl", tcc_declaration, 0)
DEFTREECODE (INSTANCE_METHOD_DECL, "instance_method_decl", tcc_declaration, 0)
DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0)
+DEFTREECODE (PROPERTY_DECL, "property_decl", tcc_declaration, 0)
/* Objective-C expressions. */
DEFTREECODE (MESSAGE_SEND_EXPR, "message_send_expr", tcc_expression, 3)
DEFTREECODE (CLASS_REFERENCE_EXPR, "class_reference_expr", tcc_expression, 1)
+/* This tree is used to represent the expression 'object.property',
+ where 'object' is an Objective-C object and 'property' is an
+ Objective-C property. Operand 0 is the object (the tree
+ representing the expression), and Operand 1 is the property (the
+ PROPERTY_DECL). Operand 2 is the 'getter' call, ready to be used;
+ we pregenerate it because it is hard to generate it properly later
+ on. Operand 3 records whether using the 'getter' call should
+ generate a deprecation warning or not.
+
+ A PROPERTY_REF tree needs to be transformed into 'setter' and
+ 'getter' calls at some point; at the moment this happens in two
+ places:
+
+ * if we detect that a modify expression is being applied to a
+ PROPERTY_REF, then we transform that into a 'getter' call (this
+ happens in build_modify_expr() or cp_build_modify_expr()).
+
+ * else, it will remain as a PROPERTY_REF until we get to
+ gimplification; at that point, we convert each PROPERTY_REF into
+ a 'getter' call during ObjC/ObjC++ gimplify. At that point, it
+ is quite hard to build a 'getter' call, but we have already built
+ it and we just need to swap Operand 2 in, and emit the deprecation
+ warnings from Operand 3 if needed.
+
+ Please note that when the Objective-C 2.0 "dot-syntax" 'object.component'
+ is encountered, where 'component' is not a property but there are valid
+ setter/getter methods for it, an artificial PROPERTY_DECL is generated
+ and used in the PROPERTY_REF. */
+DEFTREECODE (PROPERTY_REF, "property_ref", tcc_expression, 4)
+
/*
Local variables:
mode:c