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428
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1 /* Static Heap management routines for XEmacs.
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2 Copyright (C) 1994, 1998 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to the Free
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18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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19 02111-1307, USA.*/
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20
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21 #include <config.h>
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22 #include <stdio.h>
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23 #include "lisp.h"
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24 #include <unistd.h>
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25 #include <sheap-adjust.h>
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26
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27 #define STATIC_HEAP_BASE 0x800000
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28 #define STATIC_HEAP_SLOP 0x40000
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29 #define STATIC_HEAP_SIZE \
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30 (STATIC_HEAP_BASE + SHEAP_ADJUSTMENT + STATIC_HEAP_SLOP)
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31 #define BLOCKSIZE (1<<12)
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32 #define ALLOC_UNIT (BLOCKSIZE-1)
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33 #define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
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34 #define ALIGN_ALLOC(addr) ((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
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35
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36 char static_heap_buffer[STATIC_HEAP_SIZE]={0};
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37 char* static_heap_base=static_heap_buffer;
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38 char* static_heap_ptr=static_heap_buffer;
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39 unsigned long static_heap_size=STATIC_HEAP_SIZE;
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40 int static_heap_initialized=0;
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41 int static_heap_dumped=0;
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42
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43 void* more_static_core ( ptrdiff_t increment )
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44 {
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45 int size = (int) increment;
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46 void *result;
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47
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48 if (!static_heap_initialized)
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49 {
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50 #ifdef VALMASK
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51 if (((unsigned long) static_heap_base & ~VALMASK) != 0)
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52 {
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53 printf ("error: The heap was allocated in upper memory.\n");
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54 exit (-1);
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55 }
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56 #endif
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57 static_heap_base=(char*)ALIGN_ALLOC(static_heap_buffer);
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58 static_heap_ptr=static_heap_base;
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59 static_heap_size=STATIC_HEAP_SIZE -
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60 (static_heap_base-static_heap_buffer);
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61 #ifdef __CYGWIN32__
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62 sbrk(BLOCKSIZE); /* force space for fork to work */
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63 #endif
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64 static_heap_initialized=1;
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65 }
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66
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67 result = static_heap_ptr;
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68
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69 /* we don't need to align - handled by gmalloc. */
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70
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71 if (size < 0)
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72 {
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73 if (static_heap_ptr + size < static_heap_base)
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74 {
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75 return 0;
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76 }
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77 }
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78 else
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79 {
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80 if (static_heap_ptr + size >= static_heap_base + static_heap_size)
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81 {
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82 printf(
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83
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84 "\nRequested %d bytes, static heap exhausted! base is %p, current ptr
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85 is %p. You have exhausted the static heap.
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86
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87 If you are simply trying to compile, remove sheap-adjust.h
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88 and recompile from the top level. If this doesn't
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89 work then STATIC_HEAP_SLOP (defined in this file) is too small.
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90
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91 If you want to run temacs, change SHEAP_ADJUSTMENT in sheap-adjust.h
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92 to 0 or a +ve number. Generally you should *not* try to run temacs
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93 with a static heap, you should dump first.\n", size,
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94 static_heap_base, static_heap_ptr);
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95
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96 exit(-1);
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97 return 0;
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98 }
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99 }
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100 static_heap_ptr += size;
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101
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102 return result;
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103 }
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104
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105 static void
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106 sheap_adjust_h ()
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107 {
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108 FILE *stream = fopen ("sheap-adjust.h", "w");
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109
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110 if (stream == NULL)
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111 report_file_error ("Opening sheap adjustment file",
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112 Fcons (build_string ("sheap-adjust.h"), Qnil));
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113
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114 fprintf (stream,
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115 "/*\tDo not edit this file!\n"
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116 "\tAutomatically generated by XEmacs */\n"
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117 "# define SHEAP_ADJUSTMENT (%d)\n",
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118 ((static_heap_ptr - static_heap_buffer) - STATIC_HEAP_BASE));
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119 fclose (stream);
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120 }
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121
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122 void
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123 report_sheap_usage (int die_if_pure_storage_exceeded)
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124 {
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125 int rc = 0;
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126
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127 size_t lost = (STATIC_HEAP_BASE + STATIC_HEAP_SLOP + SHEAP_ADJUSTMENT)
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128 - (static_heap_ptr - static_heap_buffer);
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129 char buf[200];
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130 sprintf (buf, "Static heap usage: %ld of %ld",
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131 (long) (static_heap_ptr - static_heap_buffer),
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132 (long) (STATIC_HEAP_BASE + STATIC_HEAP_SLOP + SHEAP_ADJUSTMENT));
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133
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134 if (lost > STATIC_HEAP_SLOP) {
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135 sprintf (buf + strlen (buf), " -- %ldk wasted", (long)(lost/1024));
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136 if (die_if_pure_storage_exceeded) {
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137 sheap_adjust_h();
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138 rc = -1;
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139 }
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140 message ("%s", buf);
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141 }
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142
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143 if (rc < 0) {
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144 unlink("SATISFIED");
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145 fatal ("Static heap size adjusted, Don't Panic! I will restart the `make'");
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146 }
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147 }
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148
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149
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