aboutsummaryrefslogtreecommitdiff
path: root/gcc/params.c
blob: 41660b47393a37bb8e9f2fecc476b51a75d3fa69 (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
246
247
248
249
250
251
252
253
254
255
/* params.c - Run-time parameters.
   Copyright (C) 2001-2016 Free Software Foundation, Inc.
   Written by Mark Mitchell <mark@codesourcery.com>.

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 "common/common-target.h"
#include "params.h"
#include "params-enum.h"
#include "diagnostic-core.h"

/* An array containing the compiler parameters and their current
   values.  */

param_info *compiler_params;

/* The number of entries in the table.  */
static size_t num_compiler_params;

/* Whether the parameters have all been initialized and had their
   default values determined.  */
static bool params_finished;

#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX)
#define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT, V0, V1, V2, V3, V4)	\
  static const char *values_ ## ENUM [] = { #V0, #V1, #V2, #V3, #V4, NULL };
#include "params.def"
#undef DEFPARAMENUM5
#undef DEFPARAM

static const param_info lang_independent_params[] = {
#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
  { OPTION, DEFAULT, MIN, MAX, HELP, NULL },
#define DEFPARAMENUM5(ENUM, OPTION, HELP, DEFAULT,	     \
		      V0, V1, V2, V3, V4)		     \
  { OPTION, (int)ENUM ## _KIND_ ## DEFAULT, 0, 4, HELP, values_ ## ENUM },
#include "params.def"
#undef DEFPARAM
#undef DEFPARAMENUM5
  { NULL, 0, 0, 0, NULL, NULL }
};

/* Add the N PARAMS to the current list of compiler parameters.  */

void
add_params (const param_info params[], size_t n)
{
  gcc_assert (!params_finished);

  /* Allocate enough space for the new parameters.  */
  compiler_params = XRESIZEVEC (param_info, compiler_params,
				num_compiler_params + n);
  /* Copy them into the table.  */
  memcpy (compiler_params + num_compiler_params,
	  params,
	  n * sizeof (param_info));
  /* Keep track of how many parameters we have.  */
  num_compiler_params += n;
}

/* Add all parameters and default values that can be set in both the
   driver and the compiler proper.  */

void
global_init_params (void)
{
  gcc_assert (!params_finished);

  add_params (lang_independent_params, LAST_PARAM);
  targetm_common.option_default_params ();
}

/* Note that all parameters have been added and all default values
   set.  */

void
finish_params (void)
{
  params_finished = true;
}

/* Reset all state within params.c so that we can rerun the compiler
   within the same process.  For use by toplev::finalize.  */

void
params_c_finalize (void)
{
  XDELETEVEC (compiler_params);
  compiler_params = NULL;
  num_compiler_params = 0;
  params_finished = false;
}

/* Set the value of the parameter given by NUM to VALUE in PARAMS and
   PARAMS_SET.  If EXPLICIT_P, this is being set by the user;
   otherwise it is being set implicitly by the compiler.  */

static void
set_param_value_internal (compiler_param num, int value,
			  int *params, int *params_set,
			  bool explicit_p)
{
  size_t i = (size_t) num;

  gcc_assert (params_finished);

  params[i] = value;
  if (explicit_p)
    params_set[i] = true;
}

/* Return true if it can find the matching entry for NAME in the parameter
   table, and assign the entry index to INDEX.  Return false otherwise.  */

bool
find_param (const char *name, enum compiler_param *index)
{
  for (size_t i = 0; i < num_compiler_params; ++i)
    if (strcmp (compiler_params[i].option, name) == 0)
      {
	*index = (enum compiler_param) i;
	return true;
      }

  return false;
}

/* Return true if param with entry index INDEX should be defined using strings.
   If so, return the value corresponding to VALUE_NAME in *VALUE_P.  */

bool
param_string_value_p (enum compiler_param index, const char *value_name,
		      int *value_p)
{
  param_info *entry = &compiler_params[(int) index];
  if (entry->value_names == NULL)
    return false;

  *value_p = -1;

  for (int i = 0; entry->value_names[i] != NULL; ++i)
    if (strcmp (entry->value_names[i], value_name) == 0)
      {
	*value_p = i;
	return true;
      }

  return true;
}

/* Set the VALUE associated with the parameter given by NAME in PARAMS
   and PARAMS_SET.  */

void
set_param_value (const char *name, int value,
		 int *params, int *params_set)
{
  size_t i;

  /* Make sure nobody tries to set a parameter to an invalid value.  */
  gcc_assert (value != INVALID_PARAM_VAL);

  enum compiler_param index;
  if (!find_param (name, &index))
    {
      /* If we didn't find this parameter, issue an error message.  */
      error ("invalid parameter %qs", name);
      return;
    }
  i = (size_t)index;

  if (value < compiler_params[i].min_value)
    error ("minimum value of parameter %qs is %u",
	   compiler_params[i].option,
	   compiler_params[i].min_value);
  else if (compiler_params[i].max_value > compiler_params[i].min_value
	   && value > compiler_params[i].max_value)
    error ("maximum value of parameter %qs is %u",
	   compiler_params[i].option,
	   compiler_params[i].max_value);
  else
    set_param_value_internal ((compiler_param) i, value,
			      params, params_set, true);
}

/* Set the value of the parameter given by NUM to VALUE in PARAMS and
   PARAMS_SET, implicitly, if it has not been set explicitly by the
   user.  */

void
maybe_set_param_value (compiler_param num, int value,
		       int *params, int *params_set)
{
  if (!params_set[(int) num])
    set_param_value_internal (num, value, params, params_set, false);
}

/* Set the default value of a parameter given by NUM to VALUE, before
   option processing.  */

void
set_default_param_value (compiler_param num, int value)
{
  gcc_assert (!params_finished);

  compiler_params[(int) num].default_value = value;
}

/* Return the default value of parameter NUM.  */

int
default_param_value (compiler_param num)
{
  return compiler_params[(int) num].default_value;
}

/* Initialize an array PARAMS with default values of the
   parameters.  */

void
init_param_values (int *params)
{
  size_t i;

  gcc_assert (params_finished);

  for (i = 0; i < num_compiler_params; i++)
    params[i] = compiler_params[i].default_value;
}

/* Return the current value of num_compiler_params, for the benefit of
   plugins that use parameters as features.  */

size_t
get_num_compiler_params (void)
{
  return num_compiler_params;
}