1/* Fold a constant sub-tree into a single node for C-compiler
2 Copyright (C) 1987-2017 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along 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. */
25extern int folding_initializer;
26
27/* Convert between trees and native memory representation. */
28extern int native_encode_expr (const_tree, unsigned char *, int, int off = -1);
29extern 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
37extern tree fold (tree);
38#define fold_unary(CODE,T1,T2)\
39 fold_unary_loc (UNKNOWN_LOCATION, CODE, T1, T2)
40extern 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)
43extern 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)
46extern 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)
49extern 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)
52extern 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)
56extern 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)
60extern tree fold_build3_loc (location_t, enum tree_code, tree, tree, tree,
61 tree CXX_MEM_STAT_INFO);
62extern tree fold_build1_initializer_loc (location_t, enum tree_code, tree, tree);
63extern 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)
66extern 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)
69extern tree fold_build_call_array_initializer_loc (location_t, tree, tree, int, tree *);
70extern tree get_array_ctor_element_at_index (tree, offset_int);
71extern bool fold_convertible_p (const_tree, const_tree);
72#define fold_convert(T1,T2)\
73 fold_convert_loc (UNKNOWN_LOCATION, T1, T2)
74extern tree fold_convert_loc (location_t, tree, tree);
75extern tree fold_single_bit_test (location_t, enum tree_code, tree, tree, tree);
76extern tree fold_ignored_result (tree);
77extern tree fold_abs_const (tree, tree);
78extern tree fold_indirect_ref_1 (location_t, tree, tree);
79extern void fold_defer_overflow_warnings (void);
80extern void fold_undefer_overflow_warnings (bool, const gimple *, int);
81extern void fold_undefer_and_ignore_overflow_warnings (void);
82extern bool fold_deferring_overflow_warnings_p (void);
83extern void fold_overflow_warning (const char*, enum warn_strict_overflow_code);
84extern enum tree_code fold_div_compare (enum tree_code, tree, tree,
85 tree *, tree *, bool *);
86extern int operand_equal_p (const_tree, const_tree, unsigned int);
87extern 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)
90extern 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)
93extern tree omit_two_operands_loc (location_t, tree, tree, tree, tree);
94#define invert_truthvalue(T)\
95 invert_truthvalue_loc (UNKNOWN_LOCATION, T)
96extern tree invert_truthvalue_loc (location_t, tree);
97extern tree fold_unary_to_constant (enum tree_code, tree, tree);
98extern tree fold_binary_to_constant (enum tree_code, tree, tree, tree);
99extern tree fold_read_from_constant_string (tree);
100extern tree int_const_binop (enum tree_code, const_tree, const_tree);
101#define build_fold_addr_expr(T)\
102 build_fold_addr_expr_loc (UNKNOWN_LOCATION, (T))
103extern tree build_fold_addr_expr_loc (location_t, tree);
104#define build_fold_addr_expr_with_type(T,TYPE)\
105 build_fold_addr_expr_with_type_loc (UNKNOWN_LOCATION, (T), TYPE)
106extern tree build_fold_addr_expr_with_type_loc (location_t, tree, tree);
107extern tree fold_build_cleanup_point_expr (tree type, tree expr);
108#define build_fold_indirect_ref(T)\
109 build_fold_indirect_ref_loc (UNKNOWN_LOCATION, T)
110extern tree build_fold_indirect_ref_loc (location_t, tree);
111#define fold_indirect_ref(T)\
112 fold_indirect_ref_loc (UNKNOWN_LOCATION, T)
113extern tree fold_indirect_ref_loc (location_t, tree);
114extern tree build_simple_mem_ref_loc (location_t, tree);
115#define build_simple_mem_ref(T)\
116 build_simple_mem_ref_loc (UNKNOWN_LOCATION, T)
117extern offset_int mem_ref_offset (const_tree);
118extern tree build_invariant_address (tree, tree, HOST_WIDE_INT);
119extern tree constant_boolean_node (bool, tree);
120extern tree div_if_zero_remainder (const_tree, const_tree);
121
122extern bool tree_swap_operands_p (const_tree, const_tree);
123extern enum tree_code swap_tree_comparison (enum tree_code);
124
125extern bool ptr_difference_const (tree, tree, HOST_WIDE_INT *);
126extern enum tree_code invert_tree_comparison (enum tree_code, bool);
127
128extern bool tree_unary_nonzero_warnv_p (enum tree_code, tree, tree, bool *);
129extern bool tree_binary_nonzero_warnv_p (enum tree_code, tree, tree, tree op1,
130 bool *);
131extern bool tree_single_nonzero_warnv_p (tree, bool *);
132extern bool tree_unary_nonnegative_warnv_p (enum tree_code, tree, tree,
133 bool *, int);
134extern bool tree_binary_nonnegative_warnv_p (enum tree_code, tree, tree, tree,
135 bool *, int);
136extern bool tree_single_nonnegative_warnv_p (tree, bool *, int);
137extern bool tree_call_nonnegative_warnv_p (tree, combined_fn, tree, tree,
138 bool *, int);
139
140extern bool integer_valued_real_unary_p (tree_code, tree, int);
141extern bool integer_valued_real_binary_p (tree_code, tree, tree, int);
142extern bool integer_valued_real_call_p (combined_fn, tree, tree, int);
143extern bool integer_valued_real_single_p (tree, int);
144extern bool integer_valued_real_p (tree, int = 0);
145
146extern bool fold_real_zero_addition_p (const_tree, const_tree, int);
147extern tree combine_comparisons (location_t, enum tree_code, enum tree_code,
148 enum tree_code, tree, tree, tree);
149extern void debug_fold_checksum (const_tree);
150extern bool may_negate_without_overflow_p (const_tree);
151#define round_up(T,N) round_up_loc (UNKNOWN_LOCATION, T, N)
152extern tree round_up_loc (location_t, tree, unsigned int);
153#define round_down(T,N) round_down_loc (UNKNOWN_LOCATION, T, N)
154extern tree round_down_loc (location_t, tree, int);
155extern tree size_int_kind (HOST_WIDE_INT, enum size_type_kind);
156#define size_binop(CODE,T1,T2)\
157 size_binop_loc (UNKNOWN_LOCATION, CODE, T1, T2)
158extern tree size_binop_loc (location_t, enum tree_code, tree, tree);
159#define size_diffop(T1,T2)\
160 size_diffop_loc (UNKNOWN_LOCATION, T1, T2)
161extern tree size_diffop_loc (location_t, tree, tree);
162
163/* Return an expr equal to X but certainly not valid as an lvalue. */
164#define non_lvalue(T) non_lvalue_loc (UNKNOWN_LOCATION, T)
165extern tree non_lvalue_loc (location_t, tree);
166
167extern bool tree_expr_nonzero_p (tree);
168extern bool tree_expr_nonnegative_p (tree);
169extern bool tree_expr_nonnegative_warnv_p (tree, bool *, int = 0);
170extern tree make_range (tree, int *, tree *, tree *, bool *);
171extern tree make_range_step (location_t, enum tree_code, tree, tree, tree,
172 tree *, tree *, int *, bool *);
173extern tree range_check_type (tree);
174extern tree build_range_check (location_t, tree, tree, int, tree, tree);
175extern bool merge_ranges (int *, tree *, tree *, int, tree, tree, int,
176 tree, tree);
177extern tree sign_bit_p (tree, const_tree);
178extern tree exact_inverse (tree, tree);
179extern bool expr_not_equal_to (tree t, const wide_int &);
180extern tree const_unop (enum tree_code, tree, tree);
181extern tree const_binop (enum tree_code, tree, tree, tree);
182extern bool negate_mathfn_p (combined_fn);
183extern const char *c_getstr (tree, unsigned HOST_WIDE_INT *strlen = NULL);
184
185/* Return OFF converted to a pointer offset type suitable as offset for
186 POINTER_PLUS_EXPR. Use location LOC for this conversion. */
187extern tree convert_to_ptrofftype_loc (location_t loc, tree off);
188
189#define convert_to_ptrofftype(t) convert_to_ptrofftype_loc (UNKNOWN_LOCATION, t)
190
191/* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
192extern tree fold_build_pointer_plus_loc (location_t loc, tree ptr, tree off);
193
194#define fold_build_pointer_plus(p,o) \
195 fold_build_pointer_plus_loc (UNKNOWN_LOCATION, p, o)
196
197/* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
198extern tree fold_build_pointer_plus_hwi_loc (location_t loc, tree ptr, HOST_WIDE_INT off);
199
200#define fold_build_pointer_plus_hwi(p,o) \
201 fold_build_pointer_plus_hwi_loc (UNKNOWN_LOCATION, p, o)
202#endif // GCC_FOLD_CONST_H
203