gcc/fold-const.h

   1 /* Fold a constant sub-tree into a single node for C-compiler
   2    Copyright (C) 1987-2015 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_stat_loc (UNKNOWN_LOCATION, c, t1, t2 MEM_STAT_INFO)
  52 #define fold_build1_loc(l,c,t1,t2)\
  53    fold_build1_stat_loc (l, c, t1, t2 MEM_STAT_INFO)
  54 extern tree fold_build1_stat_loc (location_t, enum tree_code, tree,
  55                                   tree MEM_STAT_DECL);
  56 #define fold_build2(c,t1,t2,t3)\
  57    fold_build2_stat_loc (UNKNOWN_LOCATION, c, t1, t2, t3 MEM_STAT_INFO)
  58 #define fold_build2_loc(l,c,t1,t2,t3)\
  59    fold_build2_stat_loc (l, c, t1, t2, t3 MEM_STAT_INFO)
  60 extern tree fold_build2_stat_loc (location_t, enum tree_code, tree, tree,
  61                                   tree MEM_STAT_DECL);
  62 #define fold_build3(c,t1,t2,t3,t4)\
  63    fold_build3_stat_loc (UNKNOWN_LOCATION, c, t1, t2, t3, t4 MEM_STAT_INFO)
  64 #define fold_build3_loc(l,c,t1,t2,t3,t4)\
  65    fold_build3_stat_loc (l, c, t1, t2, t3, t4 MEM_STAT_INFO)
  66 extern tree fold_build3_stat_loc (location_t, enum tree_code, tree, tree, tree,
  67                                   tree MEM_STAT_DECL);
  68 extern tree fold_build1_initializer_loc (location_t, enum tree_code, tree, tree);
  69 extern tree fold_build2_initializer_loc (location_t, enum tree_code, tree, tree, tree);
  70 #define fold_build_call_array(T1,T2,N,T4)\
  71    fold_build_call_array_loc (UNKNOWN_LOCATION, T1, T2, N, T4)
  72 extern tree fold_build_call_array_loc (location_t, tree, tree, int, tree *);
  73 #define fold_build_call_array_initializer(T1,T2,N,T4)\
  74    fold_build_call_array_initializer_loc (UNKNOWN_LOCATION, T1, T2, N, T4)
  75 extern tree fold_build_call_array_initializer_loc (location_t, tree, tree, int, tree *);
  76 extern bool fold_convertible_p (const_tree, const_tree);
  77 #define fold_convert(T1,T2)\
  78    fold_convert_loc (UNKNOWN_LOCATION, T1, T2)
  79 extern tree fold_convert_loc (location_t, tree, tree);
  80 extern tree fold_single_bit_test (location_t, enum tree_code, tree, tree, tree);
  81 extern tree fold_ignored_result (tree);
  82 extern tree fold_abs_const (tree, tree);
  83 extern tree fold_indirect_ref_1 (location_t, tree, tree);
  84 extern void fold_defer_overflow_warnings (void);
  85 extern void fold_undefer_overflow_warnings (bool, const_gimple, int);
  86 extern void fold_undefer_and_ignore_overflow_warnings (void);
  87 extern bool fold_deferring_overflow_warnings_p (void);
  88 extern int operand_equal_p (const_tree, const_tree, unsigned int);
  89 extern int multiple_of_p (tree, const_tree, const_tree);
  90 #define omit_one_operand(T1,T2,T3)\
  91    omit_one_operand_loc (UNKNOWN_LOCATION, T1, T2, T3)
  92 extern tree omit_one_operand_loc (location_t, tree, tree, tree);
  93 #define omit_two_operands(T1,T2,T3,T4)\
  94    omit_two_operands_loc (UNKNOWN_LOCATION, T1, T2, T3, T4)
  95 extern tree omit_two_operands_loc (location_t, tree, tree, tree, tree);
  96 #define invert_truthvalue(T)\
  97    invert_truthvalue_loc (UNKNOWN_LOCATION, T)
  98 extern tree invert_truthvalue_loc (location_t, tree);
  99 extern tree fold_unary_to_constant (enum tree_code, tree, tree);
 100 extern tree fold_binary_to_constant (enum tree_code, tree, tree, tree);
 101 extern tree fold_read_from_constant_string (tree);
 102 extern tree int_const_binop (enum tree_code, const_tree, const_tree);
 103 #define build_fold_addr_expr(T)\
 104         build_fold_addr_expr_loc (UNKNOWN_LOCATION, (T))
 105 extern tree build_fold_addr_expr_loc (location_t, tree);
 106 #define build_fold_addr_expr_with_type(T,TYPE)\
 107         build_fold_addr_expr_with_type_loc (UNKNOWN_LOCATION, (T), TYPE)
 108 extern tree build_fold_addr_expr_with_type_loc (location_t, tree, tree);
 109 extern tree fold_build_cleanup_point_expr (tree type, tree expr);
 110 extern tree fold_strip_sign_ops (tree);
 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 offset_int mem_ref_offset (const_tree);
 121 extern tree build_invariant_address (tree, tree, HOST_WIDE_INT);
 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, bool);
 126 extern enum tree_code swap_tree_comparison (enum tree_code);
 127
 128 extern bool ptr_difference_const (tree, tree, HOST_WIDE_INT *);
 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, bool *);
 136 extern bool tree_binary_nonnegative_warnv_p (enum tree_code, tree, tree, tree,
 137                                              bool *);
 138 extern bool tree_single_nonnegative_warnv_p (tree t, bool *strict_overflow_p);
 139 extern bool tree_call_nonnegative_warnv_p (tree, tree, tree, tree, bool *);
 140
 141 extern bool fold_real_zero_addition_p (const_tree, const_tree, int);
 142 extern tree combine_comparisons (location_t, enum tree_code, enum tree_code,
 143                                  enum tree_code, tree, tree, tree);
 144 extern void debug_fold_checksum (const_tree);
 145 extern bool may_negate_without_overflow_p (const_tree);
 146 #define round_up(T,N) round_up_loc (UNKNOWN_LOCATION, T, N)
 147 extern tree round_up_loc (location_t, tree, unsigned int);
 148 #define round_down(T,N) round_down_loc (UNKNOWN_LOCATION, T, N)
 149 extern tree round_down_loc (location_t, tree, int);
 150 extern tree size_int_kind (HOST_WIDE_INT, enum size_type_kind);
 151 #define size_binop(CODE,T1,T2)\
 152    size_binop_loc (UNKNOWN_LOCATION, CODE, T1, T2)
 153 extern tree size_binop_loc (location_t, enum tree_code, tree, tree);
 154 #define size_diffop(T1,T2)\
 155    size_diffop_loc (UNKNOWN_LOCATION, T1, T2)
 156 extern tree size_diffop_loc (location_t, tree, tree);
 157
 158 /* Return an expr equal to X but certainly not valid as an lvalue.  */
 159 #define non_lvalue(T) non_lvalue_loc (UNKNOWN_LOCATION, T)
 160 extern tree non_lvalue_loc (location_t, tree);
 161
 162 extern bool tree_expr_nonnegative_p (tree);
 163 extern bool tree_expr_nonnegative_warnv_p (tree, bool *);
 164 extern tree make_range (tree, int *, tree *, tree *, bool *);
 165 extern tree make_range_step (location_t, enum tree_code, tree, tree, tree,
 166                              tree *, tree *, int *, bool *);
 167 extern tree build_range_check (location_t, tree, tree, int, tree, tree);
 168 extern bool merge_ranges (int *, tree *, tree *, int, tree, tree, int,
 169                           tree, tree);
 170 extern tree sign_bit_p (tree, const_tree);
 171 extern tree exact_inverse (tree, tree);
 172 extern tree const_unop (enum tree_code, tree, tree);
 173 extern tree const_binop (enum tree_code, tree, tree, tree);
 174
 175 /* Return OFF converted to a pointer offset type suitable as offset for
 176    POINTER_PLUS_EXPR.  Use location LOC for this conversion.  */
 177 extern tree convert_to_ptrofftype_loc (location_t loc, tree off);
 178
 179 #define convert_to_ptrofftype(t) convert_to_ptrofftype_loc (UNKNOWN_LOCATION, t)
 180
 181 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF.  */
 182 extern tree fold_build_pointer_plus_loc (location_t loc, tree ptr, tree off);
 183
 184 #define fold_build_pointer_plus(p,o) \
 185         fold_build_pointer_plus_loc (UNKNOWN_LOCATION, p, o)
 186
 187 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF.  */
 188 extern tree fold_build_pointer_plus_hwi_loc (location_t loc, tree ptr, HOST_WIDE_INT off);
 189
 190 #define fold_build_pointer_plus_hwi(p,o) \
 191         fold_build_pointer_plus_hwi_loc (UNKNOWN_LOCATION, p, o)
 192 #endif // GCC_FOLD_CONST_H