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111
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1 /* This file contains the definitions and documentation for the
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2 additional tree codes used in the Objective C front end (see tree.def
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3 for the standard codes).
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131
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4 Copyright (C) 1990-2018 Free Software Foundation, Inc.
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111
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22
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23 /* Objective-C types. */
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24 DEFTREECODE (CLASS_INTERFACE_TYPE, "class_interface_type", tcc_type, 0)
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25 DEFTREECODE (CLASS_IMPLEMENTATION_TYPE, "class_implementation_type",
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26 tcc_type, 0)
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27 DEFTREECODE (CATEGORY_INTERFACE_TYPE, "category_interface_type", tcc_type, 0)
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28 DEFTREECODE (CATEGORY_IMPLEMENTATION_TYPE,"category_implementation_type",
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29 tcc_type, 0)
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30 DEFTREECODE (PROTOCOL_INTERFACE_TYPE, "protocol_interface_type", tcc_type, 0)
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31
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32 /* Objective-C decls. */
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33 DEFTREECODE (KEYWORD_DECL, "keyword_decl", tcc_declaration, 0)
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34 DEFTREECODE (INSTANCE_METHOD_DECL, "instance_method_decl", tcc_declaration, 0)
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35 DEFTREECODE (CLASS_METHOD_DECL, "class_method_decl", tcc_declaration, 0)
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36 DEFTREECODE (PROPERTY_DECL, "property_decl", tcc_declaration, 0)
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37
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38 /* Objective-C expressions. */
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39 DEFTREECODE (MESSAGE_SEND_EXPR, "message_send_expr", tcc_expression, 3)
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40 DEFTREECODE (CLASS_REFERENCE_EXPR, "class_reference_expr", tcc_expression, 1)
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41
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42 /* This tree is used to represent the expression 'object.property',
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43 where 'object' is an Objective-C object and 'property' is an
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44 Objective-C property. Operand 0 is the object (the tree
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45 representing the expression), and Operand 1 is the property (the
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46 PROPERTY_DECL). Operand 2 is the 'getter' call, ready to be used;
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47 we pregenerate it because it is hard to generate it properly later
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48 on. Operand 3 records whether using the 'getter' call should
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49 generate a deprecation warning or not.
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50
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51 A PROPERTY_REF tree needs to be transformed into 'setter' and
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52 'getter' calls at some point; at the moment this happens in two
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53 places:
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54
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55 * if we detect that a modify expression is being applied to a
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56 PROPERTY_REF, then we transform that into a 'getter' call (this
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57 happens in build_modify_expr() or cp_build_modify_expr()).
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58
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59 * else, it will remain as a PROPERTY_REF until we get to
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60 gimplification; at that point, we convert each PROPERTY_REF into
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61 a 'getter' call during ObjC/ObjC++ gimplify. At that point, it
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62 is quite hard to build a 'getter' call, but we have already built
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63 it and we just need to swap Operand 2 in, and emit the deprecation
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64 warnings from Operand 3 if needed.
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65
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66 Please note that when the Objective-C 2.0 "dot-syntax" 'object.component'
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67 is encountered, where 'component' is not a property but there are valid
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68 setter/getter methods for it, an artificial PROPERTY_DECL is generated
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69 and used in the PROPERTY_REF. */
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70 DEFTREECODE (PROPERTY_REF, "property_ref", tcc_expression, 4)
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71
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72 /*
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73 Local variables:
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74 mode:c
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75 End:
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76 */
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