GCC Middle and Back End API Reference
Go to the documentation of this file.
1/* Export function prototypes from explow.cc.
2 Copyright (C) 2015-2024 Free Software Foundation, Inc.
4This file is part of GCC.
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
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.
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/>. */
20#ifndef GCC_EXPLOW_H
21#define GCC_EXPLOW_H
23/* Return a memory reference like MEMREF, but which is known to have a
24 valid address. */
25extern rtx validize_mem (rtx);
29/* Copy given rtx to a new temp reg and return that. */
30extern rtx copy_to_reg (rtx);
32/* Like copy_to_reg but always make the reg Pmode. */
33extern rtx copy_addr_to_reg (rtx);
35/* Like copy_to_reg but always make the reg the specified mode MODE. */
36extern rtx copy_to_mode_reg (machine_mode, rtx);
38/* Copy given rtx to given temp reg and return that. */
39extern rtx copy_to_suggested_reg (rtx, rtx, machine_mode);
41/* Copy a value to a register if it isn't already a register.
42 Args are mode (in case value is a constant) and the value. */
43extern rtx force_reg (machine_mode, rtx);
45/* Return given rtx, copied into a new temp reg if it was in memory. */
46extern rtx force_not_mem (rtx);
48/* Return mode and signedness to use when an argument or result in the
49 given mode is promoted. */
50extern machine_mode promote_function_mode (const_tree, machine_mode, int *,
51 const_tree, int);
53/* Return mode and signedness to use when an object in the given mode
54 is promoted. */
55extern machine_mode promote_mode (const_tree, machine_mode, int *);
57/* Return mode and signedness to use when object is promoted. */
58machine_mode promote_decl_mode (const_tree, int *);
60/* Return mode and signedness to use when object is promoted. */
61machine_mode promote_ssa_mode (const_tree, int *);
63/* Remove some bytes from the stack. An rtx says how many. */
64extern void adjust_stack (rtx);
66/* Add some bytes to the stack. An rtx says how many. */
67extern void anti_adjust_stack (rtx);
69/* Add some bytes to the stack while probing it. An rtx says how many. */
70extern void anti_adjust_stack_and_probe (rtx, bool);
72/* Add some bytes to the stack while probing it. An rtx says how
73 many. Add additional probes to prevent stack clashing attacks. */
76/* Support for building allocation/probing loops for stack-clash
77 protection of dyamically allocated stack space. */
81 rtx, bool);
83 rtx, bool);
85/* This enum is used for the following two functions. */
88/* Save the stack pointer at the specified level. */
89extern void emit_stack_save (enum save_level, rtx *);
91/* Restore the stack pointer from a save area of the specified level. */
92extern void emit_stack_restore (enum save_level, rtx);
94/* Invoke emit_stack_save for the nonlocal_goto_save_area. */
95extern void update_nonlocal_goto_save_area (void);
97/* Record a new stack level. */
98extern void record_new_stack_level (void);
100/* Allocate some space on the stack dynamically and return its address. */
101extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned,
102 HOST_WIDE_INT, bool);
104/* Calculate the necessary size of a constant dynamic stack allocation from the
105 size of the variable area. */
106extern void get_dynamic_stack_size (rtx *, unsigned, unsigned, HOST_WIDE_INT *);
108/* Returns the address of the dynamic stack space without allocating it. */
109extern rtx get_dynamic_stack_base (poly_int64, unsigned, rtx);
111/* Return an rtx doing runtime alignment to REQUIRED_ALIGN on TARGET. */
112extern rtx align_dynamic_address (rtx, unsigned);
114/* Emit one stack probe at ADDRESS, an address within the stack. */
115extern void emit_stack_probe (rtx);
117/* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
118 FIRST is a constant and size is a Pmode RTX. These are offsets from
119 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add
120 or subtract them from the stack pointer. */
121extern void probe_stack_range (HOST_WIDE_INT, rtx);
123/* Return an rtx that refers to the value returned by a library call
124 in its original home. This becomes invalid if any more code is emitted. */
125extern rtx hard_libcall_value (machine_mode, rtx);
127/* Return an rtx that refers to the value returned by a function
128 in its original home. This becomes invalid if any more code is emitted. */
131/* Convert arg to a valid memory address for specified machine mode that points
132 to a specific named address space, by emitting insns to perform arithmetic
133 if necessary. */
134extern rtx memory_address_addr_space (machine_mode, rtx, addr_space_t);
138/* Like memory_address_addr_space, except assume the memory address points to
139 the generic named address space. */
140#define memory_address(MODE,RTX) \
141 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
143#endif /* GCC_EXPLOW_H */
unsigned char addr_space_t
Definition coretypes.h:174
const union tree_node * const_tree
Definition coretypes.h:98
rtx copy_to_reg(rtx)
Definition explow.cc:620
void adjust_stack(rtx)
Definition explow.cc:969
void emit_stack_clash_protection_probe_loop_end(rtx, rtx, rtx, bool)
Definition explow.cc:1965
rtx force_reg(machine_mode, rtx)
Definition explow.cc:672
rtx copy_addr_to_reg(rtx)
Definition explow.cc:639
rtx hard_libcall_value(machine_mode, rtx)
Definition explow.cc:2294
rtx memory_address_addr_space(machine_mode, rtx, addr_space_t)
Definition explow.cc:438
void emit_stack_probe(rtx)
Definition explow.cc:1672
void compute_stack_clash_protection_loop_data(rtx *, rtx *, rtx *, HOST_WIDE_INT *, rtx)
Definition explow.cc:1884
void emit_stack_restore(enum save_level, rtx)
rtx copy_to_suggested_reg(rtx, rtx, machine_mode)
Definition explow.cc:773
rtx eliminate_constant_term(rtx, rtx *)
Definition explow.cc:217
rtx align_dynamic_address(rtx, unsigned)
Definition explow.cc:1202
rtx allocate_dynamic_stack_space(rtx, unsigned, unsigned, HOST_WIDE_INT, bool)
Definition explow.cc:1373
void anti_adjust_stack_and_probe(rtx, bool)
Definition explow.cc:2130
rtx copy_to_mode_reg(machine_mode, rtx)
Definition explow.cc:648
machine_mode promote_decl_mode(const_tree, int *)
Definition explow.cc:879
machine_mode promote_mode(const_tree, machine_mode, int *)
Definition explow.cc:825
void anti_adjust_stack_and_probe_stack_clash(rtx)
Definition explow.cc:2001
void probe_stack_range(HOST_WIDE_INT, rtx)
Definition explow.cc:1715
void get_dynamic_stack_size(rtx *, unsigned, unsigned, HOST_WIDE_INT *)
Definition explow.cc:1241
rtx use_anchored_address(rtx)
Definition explow.cc:565
void emit_stack_save(enum save_level, rtx *)
void emit_stack_clash_protection_probe_loop_start(rtx *, rtx *, rtx, bool)
Definition explow.cc:1943
void anti_adjust_stack(rtx)
Definition explow.cc:987
rtx hard_function_value(const_tree, const_tree, const_tree, int)
Definition explow.cc:2261
void record_new_stack_level(void)
Definition explow.cc:1188
void update_nonlocal_goto_save_area(void)
Definition explow.cc:1166
machine_mode promote_ssa_mode(const_tree, int *)
Definition explow.cc:906
machine_mode promote_function_mode(const_tree, machine_mode, int *, const_tree, int)
Definition explow.cc:794
rtx get_dynamic_stack_base(poly_int64, unsigned, rtx)
Definition explow.cc:1626
Definition explow.h:86
Definition explow.h:86
Definition explow.h:86
Definition explow.h:86
rtx force_not_mem(rtx)
Definition explow.cc:752
rtx validize_mem(rtx)
Definition explow.cc:547
Definition ggc.h:184
Definition rtl.h:311