1 /* params.c - Run-time parameters.
2 Copyright (C) 2001-2013 Free Software Foundation, Inc.
3 Written by Mark Mitchell <mark@codesourcery.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"
24 #include "common/common-target.h"
26 #include "diagnostic-core.h"
28 /* An array containing the compiler parameters and their current
31 param_info
*compiler_params
;
33 /* The number of entries in the table. */
34 static size_t num_compiler_params
;
36 /* Whether the parameters have all been initialized and had their
37 default values determined. */
38 static bool params_finished
;
40 static const param_info lang_independent_params
[] = {
41 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
42 { OPTION, DEFAULT, MIN, MAX, HELP },
45 { NULL
, 0, 0, 0, NULL
}
48 /* Add the N PARAMS to the current list of compiler parameters. */
51 add_params (const param_info params
[], size_t n
)
53 gcc_assert (!params_finished
);
55 /* Allocate enough space for the new parameters. */
56 compiler_params
= XRESIZEVEC (param_info
, compiler_params
,
57 num_compiler_params
+ n
);
58 /* Copy them into the table. */
59 memcpy (compiler_params
+ num_compiler_params
,
61 n
* sizeof (param_info
));
62 /* Keep track of how many parameters we have. */
63 num_compiler_params
+= n
;
66 /* Add all parameters and default values that can be set in both the
67 driver and the compiler proper. */
70 global_init_params (void)
72 add_params (lang_independent_params
, LAST_PARAM
);
74 targetm_common
.option_default_params ();
78 /* Note that all parameters have been added and all default values
84 params_finished
= true;
87 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
88 PARAMS_SET. If EXPLICIT_P, this is being set by the user;
89 otherwise it is being set implicitly by the compiler. */
92 set_param_value_internal (compiler_param num
, int value
,
93 int *params
, int *params_set
,
96 size_t i
= (size_t) num
;
98 gcc_assert (params_finished
);
102 params_set
[i
] = true;
105 /* Set the VALUE associated with the parameter given by NAME in PARAMS
109 set_param_value (const char *name
, int value
,
110 int *params
, int *params_set
)
114 /* Make sure nobody tries to set a parameter to an invalid value. */
115 gcc_assert (value
!= INVALID_PARAM_VAL
);
117 /* Scan the parameter table to find a matching entry. */
118 for (i
= 0; i
< num_compiler_params
; ++i
)
119 if (strcmp (compiler_params
[i
].option
, name
) == 0)
121 if (value
< compiler_params
[i
].min_value
)
122 error ("minimum value of parameter %qs is %u",
123 compiler_params
[i
].option
,
124 compiler_params
[i
].min_value
);
125 else if (compiler_params
[i
].max_value
> compiler_params
[i
].min_value
126 && value
> compiler_params
[i
].max_value
)
127 error ("maximum value of parameter %qs is %u",
128 compiler_params
[i
].option
,
129 compiler_params
[i
].max_value
);
131 set_param_value_internal ((compiler_param
) i
, value
,
132 params
, params_set
, true);
136 /* If we didn't find this parameter, issue an error message. */
137 error ("invalid parameter %qs", name
);
140 /* Set the value of the parameter given by NUM to VALUE in PARAMS and
141 PARAMS_SET, implicitly, if it has not been set explicitly by the
145 maybe_set_param_value (compiler_param num
, int value
,
146 int *params
, int *params_set
)
148 if (!params_set
[(int) num
])
149 set_param_value_internal (num
, value
, params
, params_set
, false);
152 /* Set the default value of a parameter given by NUM to VALUE, before
153 option processing. */
156 set_default_param_value (compiler_param num
, int value
)
158 gcc_assert (!params_finished
);
160 compiler_params
[(int) num
].default_value
= value
;
163 /* Return the default value of parameter NUM. */
166 default_param_value (compiler_param num
)
168 return compiler_params
[(int) num
].default_value
;
171 /* Initialize an array PARAMS with default values of the
175 init_param_values (int *params
)
179 gcc_assert (params_finished
);
181 for (i
= 0; i
< num_compiler_params
; i
++)
182 params
[i
] = compiler_params
[i
].default_value
;
185 /* Return the current value of num_compiler_params, for the benefit of
186 plugins that use parameters as features. */
189 get_num_compiler_params (void)
191 return num_compiler_params
;