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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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267
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21 #include <config.h>
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251
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22 #include <stdio.h>
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267
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23 #include "lisp.h"
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251
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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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263
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27 #define STATIC_HEAP_BASE 0x600000
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265
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28 #define STATIC_HEAP_SLOP 0x40000
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251
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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 if (((unsigned long) static_heap_base & ~VALMASK) != 0)
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51 {
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52 printf ("error: The heap was allocated in upper memory.\n");
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53 exit (-1);
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54 }
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55 static_heap_base=(char*)ALIGN_ALLOC(static_heap_buffer);
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56 static_heap_ptr=static_heap_base;
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57 static_heap_size=STATIC_HEAP_SIZE -
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58 (static_heap_base-static_heap_buffer);
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59 #ifdef __CYGWIN32__
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60 sbrk(BLOCKSIZE); /* force space for fork to work */
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61 #endif
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62 static_heap_initialized=1;
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63 }
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64
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65 result = static_heap_ptr;
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66
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67 /* we don't need to align - handled by gmalloc. */
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68
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69 if (size < 0)
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70 {
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71 if (static_heap_ptr + size < static_heap_base)
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72 {
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73 return 0;
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74 }
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75 }
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76 else
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77 {
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78 if (static_heap_ptr + size >= static_heap_base + static_heap_size)
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79 {
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80 printf(
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81
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259
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82 "\nRequested %d bytes, static heap exhausted! base is %p, current ptr
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83 is %p. You have exhausted the static heap, if you want to run temacs,
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84 adjust sheap-adjust.h to 0 or a +ve number. If you are dumping then
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85 STATIC_HEAP_SLOP is too small. Generally you should *not* try to run
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86 temacs with a static heap, you should dump first.\n", size,
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251
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87 static_heap_base, static_heap_ptr);
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88
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89 exit(-1);
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90 return 0;
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91 }
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92 }
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93 static_heap_ptr += size;
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94
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95 return result;
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96 }
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97
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98 void
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99 sheap_adjust_h ()
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100 {
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101 FILE *stream = fopen ("sheap-adjust.h", "w");
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102
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103 if (stream == NULL)
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104 report_file_error ("Opening sheap adjustment file",
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105 Fcons (build_string ("sheap-adjust.h"), Qnil));
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106
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107 fprintf (stream,
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108 "/*\tDo not edit this file!\n"
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109 "\tAutomatically generated by XEmacs */\n"
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110 "# define SHEAP_ADJUSTMENT (%d)\n",
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111 ((static_heap_ptr - static_heap_buffer) - STATIC_HEAP_BASE));
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112 fclose (stream);
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113 }
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259
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114
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