1 /* RTL manipulation functions exported by Pointer Bounds Checker.
2 Copyright (C) 2014-2016 Free Software Foundation, Inc.
3 Contributed by Ilya Enkovich (ilya.enkovich@intel.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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/>. */
23 #include "coretypes.h"
31 #include "tree-chkp.h"
33 static hash_map<tree, rtx> *chkp_rtx_bounds_map;
35 /* Get bounds rtx associated with NODE via
36 chkp_set_rtl_bounds call. */
38 chkp_get_rtl_bounds (tree node)
42 if (!chkp_rtx_bounds_map)
45 slot = chkp_rtx_bounds_map->get (node);
46 return slot ? *slot : NULL_RTX;
49 /* Associate bounds rtx VAL with NODE. */
51 chkp_set_rtl_bounds (tree node, rtx val)
53 if (!chkp_rtx_bounds_map)
54 chkp_rtx_bounds_map = new hash_map<tree, rtx>;
56 chkp_rtx_bounds_map->put (node, val);
59 /* Reset all bounds stored via chkp_set_rtl_bounds. */
61 chkp_reset_rtl_bounds ()
63 if (!chkp_rtx_bounds_map)
66 delete chkp_rtx_bounds_map;
67 chkp_rtx_bounds_map = NULL;
70 /* Split SLOT identifying slot for function value or
71 argument into two parts SLOT_VAL and SLOT_BND.
72 First is the slot for regular value and the other one is
75 chkp_split_slot (rtx slot, rtx *slot_val, rtx *slot_bnd)
86 || GET_CODE (slot) != PARALLEL)
92 val_tmps = XALLOCAVEC (rtx, XVECLEN (slot, 0));
93 bnd_tmps = XALLOCAVEC (rtx, XVECLEN (slot, 0));
95 for (i = 0; i < XVECLEN (slot, 0); i++)
97 rtx elem = XVECEXP (slot, 0, i);
98 rtx reg = GET_CODE (elem) == EXPR_LIST ? XEXP (elem, 0) : elem;
103 if (POINTER_BOUNDS_MODE_P (GET_MODE (reg)) || CONST_INT_P (reg))
104 bnd_tmps[bnd_num++] = elem;
106 val_tmps[val_num++] = elem;
109 gcc_assert (val_num);
117 if ((GET_CODE (val_tmps[0]) == EXPR_LIST) || (val_num > 1))
118 *slot_val = gen_rtx_PARALLEL (GET_MODE (slot),
119 gen_rtvec_v (val_num, val_tmps));
121 *slot_val = val_tmps[0];
123 if ((GET_CODE (bnd_tmps[0]) == EXPR_LIST) || (bnd_num > 1))
124 *slot_bnd = gen_rtx_PARALLEL (VOIDmode,
125 gen_rtvec_v (bnd_num, bnd_tmps));
127 *slot_bnd = bnd_tmps[0];
130 /* Join previously splitted to VAL and BND rtx for function
131 value or argument and return it. */
133 chkp_join_splitted_slot (rtx val, rtx bnd)
141 if (GET_CODE (val) == PARALLEL)
142 n += XVECLEN (val, 0);
146 if (GET_CODE (bnd) == PARALLEL)
147 n += XVECLEN (bnd, 0);
151 res = gen_rtx_PARALLEL (GET_MODE (val), rtvec_alloc (n));
155 if (GET_CODE (val) == PARALLEL)
156 for (i = 0; i < XVECLEN (val, 0); i++)
157 XVECEXP (res, 0, n++) = XVECEXP (val, 0, i);
159 XVECEXP (res, 0, n++) = val;
161 if (GET_CODE (bnd) == PARALLEL)
162 for (i = 0; i < XVECLEN (bnd, 0); i++)
163 XVECEXP (res, 0, n++) = XVECEXP (bnd, 0, i);
165 XVECEXP (res, 0, n++) = bnd;
170 /* If PAR is PARALLEL holding registers then transform
171 it into PARALLEL holding EXPR_LISTs of those regs
172 and zero constant (similar to how function value
173 on multiple registers looks like). */
175 chkp_put_regs_to_expr_list (rtx par)
179 if (GET_CODE (par) != PARALLEL
180 || GET_CODE (XVECEXP (par, 0, 0)) == EXPR_LIST)
183 for (n = 0; n < XVECLEN (par, 0); n++)
184 XVECEXP (par, 0, n) = gen_rtx_EXPR_LIST (VOIDmode,
189 /* Search rtx PAR describing function return value for an
190 item related to value at offset OFFS and return it.
191 Return NULL if item was not found. */
193 chkp_get_value_with_offs (rtx par, rtx offs)
197 gcc_assert (GET_CODE (par) == PARALLEL);
199 for (n = 0; n < XVECLEN (par, 0); n++)
201 rtx par_offs = XEXP (XVECEXP (par, 0, n), 1);
202 if (INTVAL (offs) == INTVAL (par_offs))
203 return XEXP (XVECEXP (par, 0, n), 0);
209 /* Emit instructions to store BOUNDS for pointer VALUE
211 Function is used by expand to pass bounds for args
214 chkp_emit_bounds_store (rtx bounds, rtx value, rtx mem)
216 gcc_assert (MEM_P (mem));
218 if (REG_P (bounds) || CONST_INT_P (bounds))
226 rtx slot = adjust_address (value, Pmode, 0);
227 ptr = gen_reg_rtx (Pmode);
228 emit_move_insn (ptr, slot);
231 if (CONST_INT_P (bounds))
232 bounds = targetm.calls.load_bounds_for_arg (value, ptr, bounds);
234 targetm.calls.store_bounds_for_arg (ptr, mem,
241 gcc_assert (GET_CODE (bounds) == PARALLEL);
242 gcc_assert (GET_CODE (value) == PARALLEL || MEM_P (value) || REG_P (value));
244 for (i = 0; i < XVECLEN (bounds, 0); i++)
246 rtx reg = XEXP (XVECEXP (bounds, 0, i), 0);
247 rtx offs = XEXP (XVECEXP (bounds, 0, i), 1);
248 rtx slot = adjust_address (mem, Pmode, INTVAL (offs));
251 if (GET_CODE (value) == PARALLEL)
252 ptr = chkp_get_value_with_offs (value, offs);
253 else if (MEM_P (value))
255 rtx tmp = adjust_address (value, Pmode, INTVAL (offs));
256 ptr = gen_reg_rtx (Pmode);
257 emit_move_insn (ptr, tmp);
260 ptr = gen_rtx_SUBREG (Pmode, value, INTVAL (offs));
262 targetm.calls.store_bounds_for_arg (ptr, slot, reg, NULL);
267 /* Emit code to copy bounds for structure VALUE of type TYPE
270 chkp_copy_bounds_for_stack_parm (rtx slot, rtx value, tree type)
277 gcc_assert (TYPE_SIZE (type));
278 gcc_assert (MEM_P (value));
279 gcc_assert (MEM_P (slot));
280 gcc_assert (RECORD_OR_UNION_TYPE_P (type));
282 bitmap_obstack_initialize (NULL);
283 have_bound = BITMAP_ALLOC (NULL);
284 chkp_find_bound_slots (type, have_bound);
286 EXECUTE_IF_SET_IN_BITMAP (have_bound, 0, i, bi)
288 rtx ptr = adjust_address (value, Pmode, i * POINTER_SIZE / 8);
289 rtx to = adjust_address (slot, Pmode, i * POINTER_SIZE / 8);
292 tmp = gen_reg_rtx (Pmode);
294 emit_move_insn (tmp, ptr);
295 bnd = targetm.calls.load_bounds_for_arg (ptr, tmp, NULL);
296 targetm.calls.store_bounds_for_arg (tmp, to, bnd, NULL);
299 BITMAP_FREE (have_bound);
300 bitmap_obstack_release (NULL);