gcc/params.h

   1 /* params.h - Run-time parameters.
   2    Copyright (C) 2001 Free Software Foundation, Inc.
   3    Written by Mark Mitchell <mark@codesourcery.com>.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.
  21
  22 */
  23
  24 /* This module provides a means for setting integral parameters
  25    dynamically.  Instead of encoding magic numbers in various places,
  26    use this module to organize all the magic numbers in a single
  27    place.  The values of the parameters can be set on the
  28    command-line, thereby providing a way to control the amount of
  29    effort spent on particular optimization passes, or otherwise tune
  30    the behavior of the compiler.
  31
  32    Since their values can be set on the command-line, these parameters
  33    should not be used for non-dynamic memory allocation.  */
  34
  35 #ifndef PARAMS_H
  36 #define PARAMS_H
  37
  38 /* No parameter shall have this value.  */
  39
  40 #define INVALID_PARAM_VAL (-1)
  41
  42 /* The information associated with each parameter.  */
  43
  44 typedef struct param_info
  45 {
  46   /* The name used with the `--param <name>=<value>' switch to set this
  47      value.  */
  48   const char *option;
  49   /* The associated value.  */
  50   int value;
  51   /* A short description of the option.  */
  52   const char *help;
  53 } param_info;
  54
  55 /* An array containing the compiler parameters and their current
  56    values.  */
  57
  58 extern param_info *compiler_params;
  59
  60 /* Add the N PARAMS to the current list of compiler parameters.  */
  61
  62 extern void add_params
  63   PARAMS ((const param_info params[], size_t n));
  64
  65 /* Set the VALUE associated with the parameter given by NAME.  */
  66
  67 extern void set_param_value
  68   PARAMS ((const char *name, int value));
  69
  70 \f
  71 /* The parameters in use by language-independent code.  */
  72
  73 typedef enum compiler_param
  74 {
  75 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
  76   ENUM,
  77 #include "params.def"
  78 #undef DEFPARAM
  79   LAST_PARAM
  80 } compiler_param;
  81
  82 /* The value of the parameter given by ENUM.  */
  83 #define PARAM_VALUE(ENUM) \
  84   (compiler_params[(int) ENUM].value)
  85
  86 /* Macros for the various parameters.  */
  87 #define MAX_INLINE_INSNS \
  88   PARAM_VALUE (PARAM_MAX_INLINE_INSNS)
  89 #define MAX_DELAY_SLOT_INSN_SEARCH \
  90   PARAM_VALUE (PARAM_MAX_DELAY_SLOT_INSN_SEARCH)
  91 #define MAX_DELAY_SLOT_LIVE_SEARCH \
  92   PARAM_VALUE (PARAM_MAX_DELAY_SLOT_LIVE_SEARCH)
  93 #define MAX_GCSE_MEMORY \
  94   ((size_t) PARAM_VALUE (PARAM_MAX_GCSE_MEMORY))
  95
  96 #endif /* PARAMS_H */