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251
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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 <stddef.h>
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25 #include "sheap-adjust.h"
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26
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27 #ifdef MULE
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28 #define STATIC_HEAP_BASE 0x500000
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29 #define STATIC_HEAP_SLOP 0x30000
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30 #else
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31 #define STATIC_HEAP_BASE 0x400000
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32 #define STATIC_HEAP_SLOP 0x20000
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33 #endif
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34 #define STATIC_HEAP_SIZE \
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35 (STATIC_HEAP_BASE + SHEAP_ADJUSTMENT + STATIC_HEAP_SLOP)
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36 #define BLOCKSIZE (1<<12)
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37 #define ALLOC_UNIT (BLOCKSIZE-1)
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38 #define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
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39 #define ALIGN_ALLOC(addr) ((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
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40
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41 char static_heap_buffer[STATIC_HEAP_SIZE]={0};
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42 char* static_heap_base=static_heap_buffer;
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43 char* static_heap_ptr=static_heap_buffer;
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44 unsigned long static_heap_size=STATIC_HEAP_SIZE;
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45 int static_heap_initialized=0;
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46 int static_heap_dumped=0;
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47
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48 void* more_static_core ( ptrdiff_t increment )
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49 {
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50 int size = (int) increment;
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51 void *result;
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52
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53 if (!static_heap_initialized)
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54 {
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55 if (((unsigned long) static_heap_base & ~VALMASK) != 0)
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56 {
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57 printf ("error: The heap was allocated in upper memory.\n");
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58 exit (-1);
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59 }
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60 static_heap_base=(char*)ALIGN_ALLOC(static_heap_buffer);
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61 static_heap_ptr=static_heap_base;
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62 static_heap_size=STATIC_HEAP_SIZE -
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63 (static_heap_base-static_heap_buffer);
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64 #ifdef __CYGWIN32__
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65 sbrk(BLOCKSIZE); /* force space for fork to work */
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66 #endif
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67 static_heap_initialized=1;
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68 }
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69
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70 result = static_heap_ptr;
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71
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72 /* we don't need to align - handled by gmalloc. */
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73
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74 if (size < 0)
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75 {
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76 if (static_heap_ptr + size < static_heap_base)
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77 {
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78 return 0;
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79 }
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80 }
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81 else
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82 {
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83 if (static_heap_ptr + size >= static_heap_base + static_heap_size)
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84 {
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85 printf(
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86
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87 "\nRequested %d bytes, static heap exhausted! base is %p,\n
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88 current ptr is %p. You have exhausted the static heap, if\n
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89 you want to run temacs, adjust sheap-adjust.h to 0 or a +ve\n
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90 number. If you are dumping then STATIC_HEAP_SLOP is too\n
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91 small. Generally you should *not* try to run temacs with a\n
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92 static heap, you should dump first.", size,
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93 static_heap_base, static_heap_ptr);
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94
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95 exit(-1);
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96 return 0;
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97 }
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98 }
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99 static_heap_ptr += size;
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100
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101 return result;
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102 }
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103
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104 void
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105 sheap_adjust_h ()
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106 {
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107 FILE *stream = fopen ("sheap-adjust.h", "w");
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108
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109 if (stream == NULL)
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110 report_file_error ("Opening sheap adjustment file",
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111 Fcons (build_string ("sheap-adjust.h"), Qnil));
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112
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113 fprintf (stream,
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114 "/*\tDo not edit this file!\n"
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115 "\tAutomatically generated by XEmacs */\n"
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116 "# define SHEAP_ADJUSTMENT (%d)\n",
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117 ((static_heap_ptr - static_heap_buffer) - STATIC_HEAP_BASE));
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118 fclose (stream);
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119 }
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