1 /* Convert language-specific tree expression to rtl instructions, 2 for GNU compiler. 3 Copyright (C) 1988-2016 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 22 #include "config.h" 23 #include "system.h" 24 #include "coretypes.h" 25 #include "cp-tree.h" 26 27 /* Expand C++-specific constants. Currently, this means PTRMEM_CST. */ 28 29 tree 30 cplus_expand_constant (tree cst) 31 { 32 switch (TREE_CODE (cst)) 33 { 34 case PTRMEM_CST: 35 { 36 tree type = TREE_TYPE (cst); 37 tree member; 38 39 /* Find the member. */ 40 member = PTRMEM_CST_MEMBER (cst); 41 42 /* We can't lower this until the class is complete. */ 43 if (!COMPLETE_TYPE_P (DECL_CONTEXT (member))) 44 return cst; 45 46 if (TREE_CODE (member) == FIELD_DECL) 47 { 48 /* Find the offset for the field. */ 49 cst = byte_position (member); 50 while (!same_type_p (DECL_CONTEXT (member), 51 TYPE_PTRMEM_CLASS_TYPE (type))) 52 { 53 /* The MEMBER must have been nestled within an 54 anonymous aggregate contained in TYPE. Find the 55 anonymous aggregate. */ 56 member = lookup_anon_field (TYPE_PTRMEM_CLASS_TYPE (type), 57 DECL_CONTEXT (member)); 58 cst = size_binop (PLUS_EXPR, cst, byte_position (member)); 59 } 60 cst = fold (build_nop (type, cst)); 61 } 62 else 63 { 64 tree delta; 65 tree pfn; 66 67 expand_ptrmemfunc_cst (cst, &delta, &pfn); 68 cst = build_ptrmemfunc1 (type, delta, pfn); 69 } 70 } 71 break; 72 73 case CONSTRUCTOR: 74 { 75 constructor_elt *elt; 76 unsigned HOST_WIDE_INT idx; 77 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (cst), idx, elt) 78 elt->value = cplus_expand_constant (elt->value); 79 } 80 81 default: 82 /* There's nothing to do. */ 83 break; 84 } 85 86 return cst; 87 } 88 89 /* Called whenever the expression EXPR is used in an rvalue context. 90 When REJECT_BUILTIN is true the expression is checked to make sure 91 it doesn't make it possible to obtain the address of a GCC built-in 92 function with no library fallback (or any of its bits, such as in 93 a conversion to bool). */ 94 tree 95 mark_rvalue_use (tree expr, 96 location_t loc /* = UNKNOWN_LOCATION */, 97 bool reject_builtin /* = true */) 98 { 99 if (reject_builtin && reject_gcc_builtin (expr, loc)) 100 return error_mark_node; 101 102 mark_exp_read (expr); 103 return expr; 104 } 105 106 /* Called whenever an expression is used in an lvalue context. */ 107 108 tree 109 mark_lvalue_use (tree expr) 110 { 111 mark_exp_read (expr); 112 return expr; 113 } 114 115 /* Called whenever an expression is used in a type use context. */ 116 117 tree 118 mark_type_use (tree expr) 119 { 120 mark_exp_read (expr); 121 return expr; 122 } 123 124 /* Mark EXP as read, not just set, for set but not used -Wunused 125 warning purposes. */ 126 127 void 128 mark_exp_read (tree exp) 129 { 130 if (exp == NULL) 131 return; 132 133 switch (TREE_CODE (exp)) 134 { 135 case VAR_DECL: 136 case PARM_DECL: 137 DECL_READ_P (exp) = 1; 138 break; 139 case ARRAY_REF: 140 case COMPONENT_REF: 141 case MODIFY_EXPR: 142 case REALPART_EXPR: 143 case IMAGPART_EXPR: 144 CASE_CONVERT: 145 case ADDR_EXPR: 146 case INDIRECT_REF: 147 case FLOAT_EXPR: 148 case NON_DEPENDENT_EXPR: 149 mark_exp_read (TREE_OPERAND (exp, 0)); 150 break; 151 case COMPOUND_EXPR: 152 mark_exp_read (TREE_OPERAND (exp, 1)); 153 break; 154 case COND_EXPR: 155 if (TREE_OPERAND (exp, 1)) 156 mark_exp_read (TREE_OPERAND (exp, 1)); 157 if (TREE_OPERAND (exp, 2)) 158 mark_exp_read (TREE_OPERAND (exp, 2)); 159 break; 160 default: 161 break; 162 } 163 } 164 165