gcc/fold-const.h

   1 /* Fold a constant sub-tree into a single node for C-compiler
   2    Copyright (C) 1987-2018 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_FOLD_CONST_H
  21 #define GCC_FOLD_CONST_H
  22
  23 /* Non-zero if we are folding constants inside an initializer; zero
  24    otherwise.  */
  25 extern int folding_initializer;
  26
  27 /* Convert between trees and native memory representation.  */
  28 extern int native_encode_expr (const_tree, unsigned char *, int, int off = -1);
  29 extern tree native_interpret_expr (tree, const unsigned char *, int);
  30
  31 /* Fold constants as much as possible in an expression.
  32    Returns the simplified expression.
  33    Acts only on the top level of the expression;
  34    if the argument itself cannot be simplified, its
  35    subexpressions are not changed.  */
  36
  37 extern tree fold (tree);
  38 #define fold_unary(CODE,T1,T2)\
  39    fold_unary_loc (UNKNOWN_LOCATION, CODE, T1, T2)
  40 extern tree fold_unary_loc (location_t, enum tree_code, tree, tree);
  41 #define fold_unary_ignore_overflow(CODE,T1,T2)\
  42    fold_unary_ignore_overflow_loc (UNKNOWN_LOCATION, CODE, T1, T2)
  43 extern tree fold_unary_ignore_overflow_loc (location_t, enum tree_code, tree, tree);
  44 #define fold_binary(CODE,T1,T2,T3)\
  45    fold_binary_loc (UNKNOWN_LOCATION, CODE, T1, T2, T3)
  46 extern tree fold_binary_loc (location_t, enum tree_code, tree, tree, tree);
  47 #define fold_ternary(CODE,T1,T2,T3,T4)\
  48    fold_ternary_loc (UNKNOWN_LOCATION, CODE, T1, T2, T3, T4)
  49 extern tree fold_ternary_loc (location_t, enum tree_code, tree, tree, tree, tree);
  50 #define fold_build1(c,t1,t2)\
  51    fold_build1_loc (UNKNOWN_LOCATION, c, t1, t2 MEM_STAT_INFO)
  52 extern tree fold_build1_loc (location_t, enum tree_code, tree,
  53                              tree CXX_MEM_STAT_INFO);
  54 #define fold_build2(c,t1,t2,t3)\
  55    fold_build2_loc (UNKNOWN_LOCATION, c, t1, t2, t3 MEM_STAT_INFO)
  56 extern tree fold_build2_loc (location_t, enum tree_code, tree, tree,
  57                              tree CXX_MEM_STAT_INFO);
  58 #define fold_build3(c,t1,t2,t3,t4)\
  59    fold_build3_loc (UNKNOWN_LOCATION, c, t1, t2, t3, t4 MEM_STAT_INFO)
  60 extern tree fold_build3_loc (location_t, enum tree_code, tree, tree, tree,
  61                                   tree CXX_MEM_STAT_INFO);
  62 extern tree fold_build1_initializer_loc (location_t, enum tree_code, tree, tree);
  63 extern tree fold_build2_initializer_loc (location_t, enum tree_code, tree, tree, tree);
  64 #define fold_build_call_array(T1,T2,N,T4)\
  65    fold_build_call_array_loc (UNKNOWN_LOCATION, T1, T2, N, T4)
  66 extern tree fold_build_call_array_loc (location_t, tree, tree, int, tree *);
  67 #define fold_build_call_array_initializer(T1,T2,N,T4)\
  68    fold_build_call_array_initializer_loc (UNKNOWN_LOCATION, T1, T2, N, T4)
  69 extern tree fold_build_call_array_initializer_loc (location_t, tree, tree, int, tree *);
  70 extern tree get_array_ctor_element_at_index (tree, offset_int);
  71 extern bool fold_convertible_p (const_tree, const_tree);
  72 #define fold_convert(T1,T2)\
  73    fold_convert_loc (UNKNOWN_LOCATION, T1, T2)
  74 extern tree fold_convert_loc (location_t, tree, tree);
  75 extern tree fold_single_bit_test (location_t, enum tree_code, tree, tree, tree);
  76 extern tree fold_ignored_result (tree);
  77 extern tree fold_abs_const (tree, tree);
  78 extern tree fold_indirect_ref_1 (location_t, tree, tree);
  79 extern void fold_defer_overflow_warnings (void);
  80 extern void fold_undefer_overflow_warnings (bool, const gimple *, int);
  81 extern void fold_undefer_and_ignore_overflow_warnings (void);
  82 extern bool fold_deferring_overflow_warnings_p (void);
  83 extern void fold_overflow_warning (const char*, enum warn_strict_overflow_code);
  84 extern enum tree_code fold_div_compare (enum tree_code, tree, tree,
  85                                         tree *, tree *, bool *);
  86 extern int operand_equal_p (const_tree, const_tree, unsigned int);
  87 extern int multiple_of_p (tree, const_tree, const_tree);
  88 #define omit_one_operand(T1,T2,T3)\
  89    omit_one_operand_loc (UNKNOWN_LOCATION, T1, T2, T3)
  90 extern tree omit_one_operand_loc (location_t, tree, tree, tree);
  91 #define omit_two_operands(T1,T2,T3,T4)\
  92    omit_two_operands_loc (UNKNOWN_LOCATION, T1, T2, T3, T4)
  93 extern tree omit_two_operands_loc (location_t, tree, tree, tree, tree);
  94 #define invert_truthvalue(T)\
  95    invert_truthvalue_loc (UNKNOWN_LOCATION, T)
  96 extern tree invert_truthvalue_loc (location_t, tree);
  97 extern tree fold_unary_to_constant (enum tree_code, tree, tree);
  98 extern tree fold_binary_to_constant (enum tree_code, tree, tree, tree);
  99 extern tree fold_bit_and_mask (tree, tree, enum tree_code,
 100                                tree, enum tree_code, tree, tree,
 101                                tree, enum tree_code, tree, tree, tree *);
 102 extern tree fold_read_from_constant_string (tree);
 103 extern tree int_const_binop (enum tree_code, const_tree, const_tree);
 104 #define build_fold_addr_expr(T)\
 105         build_fold_addr_expr_loc (UNKNOWN_LOCATION, (T))
 106 extern tree build_fold_addr_expr_loc (location_t, tree);
 107 #define build_fold_addr_expr_with_type(T,TYPE)\
 108         build_fold_addr_expr_with_type_loc (UNKNOWN_LOCATION, (T), TYPE)
 109 extern tree build_fold_addr_expr_with_type_loc (location_t, tree, tree);
 110 extern tree fold_build_cleanup_point_expr (tree type, tree expr);
 111 #define build_fold_indirect_ref(T)\
 112         build_fold_indirect_ref_loc (UNKNOWN_LOCATION, T)
 113 extern tree build_fold_indirect_ref_loc (location_t, tree);
 114 #define fold_indirect_ref(T)\
 115         fold_indirect_ref_loc (UNKNOWN_LOCATION, T)
 116 extern tree fold_indirect_ref_loc (location_t, tree);
 117 extern tree build_simple_mem_ref_loc (location_t, tree);
 118 #define build_simple_mem_ref(T)\
 119         build_simple_mem_ref_loc (UNKNOWN_LOCATION, T)
 120 extern poly_offset_int mem_ref_offset (const_tree);
 121 extern tree build_invariant_address (tree, tree, poly_int64);
 122 extern tree constant_boolean_node (bool, tree);
 123 extern tree div_if_zero_remainder (const_tree, const_tree);
 124
 125 extern bool tree_swap_operands_p (const_tree, const_tree);
 126 extern enum tree_code swap_tree_comparison (enum tree_code);
 127
 128 extern bool ptr_difference_const (tree, tree, poly_int64_pod *);
 129 extern enum tree_code invert_tree_comparison (enum tree_code, bool);
 130
 131 extern bool tree_unary_nonzero_warnv_p (enum tree_code, tree, tree, bool *);
 132 extern bool tree_binary_nonzero_warnv_p (enum tree_code, tree, tree, tree op1,
 133                                          bool *);
 134 extern bool tree_single_nonzero_warnv_p (tree, bool *);
 135 extern bool tree_unary_nonnegative_warnv_p (enum tree_code, tree, tree,
 136                                             bool *, int);
 137 extern bool tree_binary_nonnegative_warnv_p (enum tree_code, tree, tree, tree,
 138                                              bool *, int);
 139 extern bool tree_single_nonnegative_warnv_p (tree, bool *, int);
 140 extern bool tree_call_nonnegative_warnv_p (tree, combined_fn, tree, tree,
 141                                            bool *, int);
 142
 143 extern bool integer_valued_real_unary_p (tree_code, tree, int);
 144 extern bool integer_valued_real_binary_p (tree_code, tree, tree, int);
 145 extern bool integer_valued_real_call_p (combined_fn, tree, tree, int);
 146 extern bool integer_valued_real_single_p (tree, int);
 147 extern bool integer_valued_real_p (tree, int = 0);
 148
 149 extern bool fold_real_zero_addition_p (const_tree, const_tree, int);
 150 extern tree combine_comparisons (location_t, enum tree_code, enum tree_code,
 151                                  enum tree_code, tree, tree, tree);
 152 extern void debug_fold_checksum (const_tree);
 153 extern bool may_negate_without_overflow_p (const_tree);
 154 #define round_up(T,N) round_up_loc (UNKNOWN_LOCATION, T, N)
 155 extern tree round_up_loc (location_t, tree, unsigned int);
 156 #define round_down(T,N) round_down_loc (UNKNOWN_LOCATION, T, N)
 157 extern tree round_down_loc (location_t, tree, int);
 158 extern tree size_int_kind (poly_int64, enum size_type_kind);
 159 #define size_binop(CODE,T1,T2)\
 160    size_binop_loc (UNKNOWN_LOCATION, CODE, T1, T2)
 161 extern tree size_binop_loc (location_t, enum tree_code, tree, tree);
 162 #define size_diffop(T1,T2)\
 163    size_diffop_loc (UNKNOWN_LOCATION, T1, T2)
 164 extern tree size_diffop_loc (location_t, tree, tree);
 165
 166 /* Return an expr equal to X but certainly not valid as an lvalue.  */
 167 #define non_lvalue(T) non_lvalue_loc (UNKNOWN_LOCATION, T)
 168 extern tree non_lvalue_loc (location_t, tree);
 169
 170 extern bool tree_expr_nonzero_p (tree);
 171 extern bool tree_expr_nonnegative_p (tree);
 172 extern bool tree_expr_nonnegative_warnv_p (tree, bool *, int = 0);
 173 extern tree make_range (tree, int *, tree *, tree *, bool *);
 174 extern tree make_range_step (location_t, enum tree_code, tree, tree, tree,
 175                              tree *, tree *, int *, bool *);
 176 extern tree range_check_type (tree);
 177 extern tree build_range_check (location_t, tree, tree, int, tree, tree);
 178 extern bool merge_ranges (int *, tree *, tree *, int, tree, tree, int,
 179                           tree, tree);
 180 extern tree sign_bit_p (tree, const_tree);
 181 extern tree exact_inverse (tree, tree);
 182 extern bool expr_not_equal_to (tree t, const wide_int &);
 183 extern tree const_unop (enum tree_code, tree, tree);
 184 extern tree const_binop (enum tree_code, tree, tree, tree);
 185 extern bool negate_mathfn_p (combined_fn);
 186 extern const char *c_getstr (tree, unsigned HOST_WIDE_INT * = NULL,
 187                              unsigned HOST_WIDE_INT * = NULL);
 188 extern wide_int tree_nonzero_bits (const_tree);
 189
 190 /* Return OFF converted to a pointer offset type suitable as offset for
 191    POINTER_PLUS_EXPR.  Use location LOC for this conversion.  */
 192 extern tree convert_to_ptrofftype_loc (location_t loc, tree off);
 193
 194 #define convert_to_ptrofftype(t) convert_to_ptrofftype_loc (UNKNOWN_LOCATION, t)
 195
 196 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF.  */
 197 extern tree fold_build_pointer_plus_loc (location_t loc, tree ptr, tree off);
 198
 199 #define fold_build_pointer_plus(p,o) \
 200         fold_build_pointer_plus_loc (UNKNOWN_LOCATION, p, o)
 201
 202 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF.  */
 203 extern tree fold_build_pointer_plus_hwi_loc (location_t loc, tree ptr, HOST_WIDE_INT off);
 204
 205 #define fold_build_pointer_plus_hwi(p,o) \
 206         fold_build_pointer_plus_hwi_loc (UNKNOWN_LOCATION, p, o)
 207 #endif // GCC_FOLD_CONST_H