aboutsummaryrefslogtreecommitdiff
path: root/gcc/lists.c
blob: 96b4bc7266d012c33bd4fba86175d1ca978c0102 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
/* List management for the GCC expander.
   Copyright (C) 1987-2016 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"

static void free_list (rtx *, rtx *);

/* Functions for maintaining cache-able lists of EXPR_LIST and INSN_LISTs.  */

/* An INSN_LIST containing all INSN_LISTs allocated but currently unused.  */
static GTY ((deletable)) rtx unused_insn_list;

/* An EXPR_LIST containing all EXPR_LISTs allocated but currently unused.  */
static GTY ((deletable)) rtx unused_expr_list;

/* This function will free an entire list of either EXPR_LIST, INSN_LIST
   or DEPS_LIST nodes.  This is to be used only on lists that consist
   exclusively of nodes of one type only.  This is only called by
   free_EXPR_LIST_list, free_INSN_LIST_list and free_DEPS_LIST_list.  */
static void
free_list (rtx *listp, rtx *unused_listp)
{
  rtx link, prev_link;

  prev_link = *listp;
  link = XEXP (prev_link, 1);

  gcc_assert (unused_listp != &unused_insn_list
	      || GET_CODE (prev_link) == INSN_LIST);

  while (link)
    {
      gcc_assert (unused_listp != &unused_insn_list
		  || GET_CODE (prev_link) == INSN_LIST);

      prev_link = link;
      link = XEXP (link, 1);
    }

  XEXP (prev_link, 1) = *unused_listp;
  *unused_listp = *listp;
  *listp = 0;
}

/* Find corresponding to ELEM node in the list pointed to by LISTP.
   This node must exist in the list.  Returns pointer to that node.  */
static rtx *
find_list_elem (rtx elem, rtx *listp)
{
  while (XEXP (*listp, 0) != elem)
    listp = &XEXP (*listp, 1);
  return listp;
}

/* Remove the node pointed to by LISTP from the list.  */
static void
remove_list_node (rtx *listp)
{
  rtx node;

  node = *listp;
  *listp = XEXP (node, 1);
  XEXP (node, 1) = 0;
}

/* Removes corresponding to ELEM node from the list pointed to by LISTP.
   Returns that node.  */
rtx
remove_list_elem (rtx elem, rtx *listp)
{
  rtx node;

  listp = find_list_elem (elem, listp);
  node = *listp;
  remove_list_node (listp);
  return node;
}

/* This call is used in place of a gen_rtx_INSN_LIST. If there is a cached
   node available, we'll use it, otherwise a call to gen_rtx_INSN_LIST
   is made.  */
rtx_insn_list *
alloc_INSN_LIST (rtx val, rtx next)
{
  rtx_insn_list *r;

  if (unused_insn_list)
    {
      r = as_a <rtx_insn_list *> (unused_insn_list);
      unused_insn_list = r->next ();
      XEXP (r, 0) = val;
      XEXP (r, 1) = next;
      PUT_REG_NOTE_KIND (r, VOIDmode);

      gcc_assert (GET_CODE (r) == INSN_LIST);
    }
  else
    r = gen_rtx_INSN_LIST (VOIDmode, val, next);

  return r;
}

/* This call is used in place of a gen_rtx_EXPR_LIST. If there is a cached
   node available, we'll use it, otherwise a call to gen_rtx_EXPR_LIST
   is made.  */
rtx_expr_list *
alloc_EXPR_LIST (int kind, rtx val, rtx next)
{
  rtx_expr_list *r;

  if (unused_expr_list)
    {
      r = as_a <rtx_expr_list *> (unused_expr_list);
      unused_expr_list = XEXP (r, 1);
      XEXP (r, 0) = val;
      XEXP (r, 1) = next;
      PUT_REG_NOTE_KIND (r, kind);
    }
  else
    r = gen_rtx_EXPR_LIST ((machine_mode) kind, val, next);

  return r;
}

/* This function will free up an entire list of EXPR_LIST nodes.  */
void
free_EXPR_LIST_list (rtx_expr_list **listp)
{
  if (*listp == 0)
    return;
  free_list ((rtx *)listp, &unused_expr_list);
}

/* This function will free up an entire list of INSN_LIST nodes.  */
void
free_INSN_LIST_list (rtx_insn_list **listp)
{
  if (*listp == 0)
    return;
  free_list ((rtx *)listp, &unused_insn_list);
}

/* Make a copy of the INSN_LIST list LINK and return it.  */
rtx_insn_list *
copy_INSN_LIST (rtx_insn_list *link)
{
  rtx_insn_list *new_queue;
  rtx_insn_list **pqueue = &new_queue;

  for (; link; link = link->next ())
    {
      rtx_insn *x = link->insn ();
      rtx_insn_list *newlink = alloc_INSN_LIST (x, NULL);
      *pqueue = newlink;
      pqueue = (rtx_insn_list **)&XEXP (newlink, 1);
    }
  *pqueue = NULL;
  return new_queue;
}

/* Duplicate the INSN_LIST elements of COPY and prepend them to OLD.  */
rtx_insn_list *
concat_INSN_LIST (rtx_insn_list *copy, rtx_insn_list *old)
{
  rtx_insn_list *new_rtx = old;
  for (; copy ; copy = copy->next ())
    {
      new_rtx = alloc_INSN_LIST (copy->insn (), new_rtx);
      PUT_REG_NOTE_KIND (new_rtx, REG_NOTE_KIND (copy));
    }
  return new_rtx;
}

/* This function will free up an individual EXPR_LIST node.  */
void
free_EXPR_LIST_node (rtx ptr)
{
  XEXP (ptr, 1) = unused_expr_list;
  unused_expr_list = ptr;
}

/* This function will free up an individual INSN_LIST node.  */
void
free_INSN_LIST_node (rtx ptr)
{
  gcc_assert (GET_CODE (ptr) == INSN_LIST);
  XEXP (ptr, 1) = unused_insn_list;
  unused_insn_list = ptr;
}

/* Remove and free corresponding to ELEM node in the INSN_LIST pointed to
   by LISTP.  */
void
remove_free_INSN_LIST_elem (rtx_insn *elem, rtx_insn_list **listp)
{
  free_INSN_LIST_node (remove_list_elem (elem, (rtx *)listp));
}

/* Remove and free the first node in the INSN_LIST pointed to by LISTP.  */
rtx_insn *
remove_free_INSN_LIST_node (rtx_insn_list **listp)
{
  rtx_insn_list *node = *listp;
  rtx_insn *elem = node->insn ();

  remove_list_node ((rtx *)listp);
  free_INSN_LIST_node (node);

  return elem;
}

/* Remove and free the first node in the EXPR_LIST pointed to by LISTP.  */
rtx
remove_free_EXPR_LIST_node (rtx_expr_list **listp)
{
  rtx_expr_list *node = *listp;
  rtx elem = XEXP (node, 0);

  remove_list_node ((rtx *)listp);
  free_EXPR_LIST_node (node);

  return elem;
}

#include "gt-lists.h"