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428
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1 /* Heap management routines for XEmacs on Windows NT.
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2 Copyright (C) 1994 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 Geoff Voelker (voelker@cs.washington.edu) 7-29-94 */
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22
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23 /* Adapted for XEmacs by David Hobley <david@spook-le0.cia.com.au> */
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771
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24 /* Synced with FSF Emacs 19.34.6 by Marc Paquette <marcpa@cam.org>
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25 (Note: Sync messages from Marc Paquette may indicate
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26 incomplete synching, so beware.)
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27 */
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428
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28
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814
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29 /* This file has been Mule-ized, Ben Wing, 4-13-02. */
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30
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428
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31 #include <config.h>
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771
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32 #include "lisp.h"
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428
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33
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814
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34 #include "sysdep.h"
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771
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35 #include "syswindows.h"
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428
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36
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37 /* This gives us the page size and the size of the allocation unit on NT. */
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38 SYSTEM_INFO sysinfo_cache;
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39 unsigned long syspage_mask = 0;
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40
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41 /* These are defined to get Emacs to compile, but are not used. */
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42 int edata;
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43 int etext;
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44
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45 /* Cache information describing the NT system for later use. */
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46 void
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47 cache_system_info (void)
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48 {
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49 /* Cache page size, allocation unit, processor type, etc. */
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50 GetSystemInfo (&sysinfo_cache);
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51 syspage_mask = sysinfo_cache.dwPageSize - 1;
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52 }
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53
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54 /* Round ADDRESS up to be aligned with ALIGN. */
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2367
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55 URawbyte *
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56 round_to_next (URawbyte *address, unsigned long align)
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428
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57 {
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58 unsigned long tmp;
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59
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60 tmp = (unsigned long) address;
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61 tmp = (tmp + align - 1) / align;
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62
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2367
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63 return (URawbyte *) (tmp * align);
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428
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64 }
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65
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66 /* Info for keeping track of our heap. */
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2367
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67 URawbyte *data_region_base = UNINIT_PTR;
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68 URawbyte *data_region_end = UNINIT_PTR;
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69 URawbyte *real_data_region_end = UNINIT_PTR;
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428
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70 unsigned long data_region_size = UNINIT_LONG;
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71 unsigned long reserved_heap_size = UNINIT_LONG;
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72
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73 /* The start of the data segment. */
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2367
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74 URawbyte *
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428
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75 get_data_start (void)
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76 {
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77 return data_region_base;
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78 }
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79
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80 /* The end of the data segment. */
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2367
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81 URawbyte *
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428
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82 get_data_end (void)
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83 {
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84 return data_region_end;
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85 }
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86
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2367
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87 static URawbyte *
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428
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88 allocate_heap (void)
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89 {
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90 /* The base address for our GNU malloc heap is chosen in conjunction
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91 with the link settings for temacs.exe which control the stack size,
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92 the initial default process heap size and the executable image base
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93 address. The link settings and the malloc heap base below must all
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94 correspond; the relationship between these values depends on how NT
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95 and Win95 arrange the virtual address space for a process (and on
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96 the size of the code and data segments in temacs.exe).
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97
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98 The most important thing is to make base address for the executable
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99 image high enough to leave enough room between it and the 4MB floor
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100 of the process address space on Win95 for the primary thread stack,
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101 the process default heap, and other assorted odds and ends
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102 (eg. environment strings, private system dll memory etc) that are
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103 allocated before temacs has a chance to grab its malloc arena. The
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104 malloc heap base can then be set several MB higher than the
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105 executable image base, leaving enough room for the code and data
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106 segments.
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107
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108 Because some parts of Emacs can use rather a lot of stack space
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109 (for instance, the regular expression routines can potentially
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110 allocate several MB of stack space) we allow 8MB for the stack.
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111
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112 Allowing 1MB for the default process heap, and 1MB for odds and
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113 ends, we can base the executable at 16MB and still have a generous
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114 safety margin. At the moment, the executable has about 810KB of
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115 code (for x86) and about 550KB of data - on RISC platforms the code
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116 size could be roughly double, so if we allow 4MB for the executable
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117 we will have plenty of room for expansion.
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118
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119 Thus we would like to set the malloc heap base to 20MB. However,
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120 Win95 refuses to allocate the heap starting at this address, so we
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121 set the base to 27MB to make it happy. Since Emacs now leaves
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122 28 bits available for pointers, this lets us use the remainder of
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123 the region below the 256MB line for our malloc arena - 229MB is
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124 still a pretty decent arena to play in! */
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125
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126 unsigned long base = 0x01B00000; /* 27MB */
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438
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127 /* Temporary hack for the non-starting problem - use 28 (256Mb) rather than VALBITS (1Gb) */
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128 unsigned long end = 1 << 28; /* 256MB */
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428
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129 void *ptr = NULL;
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130
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131 #define NTHEAP_PROBE_BASE 1
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132 #if NTHEAP_PROBE_BASE /* This is never normally defined */
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133 /* Try various addresses looking for one the kernel will let us have. */
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134 while (!ptr && (base < end))
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135 {
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136 reserved_heap_size = end - base;
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137 ptr = VirtualAlloc ((void *) base,
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138 get_reserved_heap_size (),
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139 MEM_RESERVE,
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140 PAGE_NOACCESS);
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141 base += 0x00100000; /* 1MB increment */
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142 }
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143 #else
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144 reserved_heap_size = end - base;
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145 ptr = VirtualAlloc ((void *) base,
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146 get_reserved_heap_size (),
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147 MEM_RESERVE,
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148 PAGE_NOACCESS);
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149 #endif
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150
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2367
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151 return (URawbyte *) ptr;
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428
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152 }
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153
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154
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155 /* Emulate Unix sbrk. */
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156 void *
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157 sbrk (unsigned long increment)
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158 {
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159 void *result;
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160 long size = (long) increment;
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161
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162 /* Allocate our heap if we haven't done so already. */
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163 if (data_region_base == UNINIT_PTR)
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164 {
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165 data_region_base = allocate_heap ();
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166 if (!data_region_base)
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167 return NULL;
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168
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169 data_region_end = data_region_base;
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170 real_data_region_end = data_region_end;
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171 data_region_size = get_reserved_heap_size ();
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172 }
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173
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174 result = data_region_end;
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175
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176 /* If size is negative, shrink the heap by decommitting pages. */
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177 if (size < 0)
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178 {
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179 int new_size;
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2367
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180 URawbyte *new_data_region_end;
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428
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181
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182 size = -size;
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183
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184 /* Sanity checks. */
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185 if ((data_region_end - size) < data_region_base)
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186 return NULL;
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187
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188 /* We can only decommit full pages, so allow for
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189 partial deallocation [cga]. */
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190 new_data_region_end = (data_region_end - size);
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2367
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191 new_data_region_end = (URawbyte *)
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428
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192 ((long) (new_data_region_end + syspage_mask) & ~syspage_mask);
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193 new_size = real_data_region_end - new_data_region_end;
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194 real_data_region_end = new_data_region_end;
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195 if (new_size > 0)
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196 {
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197 /* Decommit size bytes from the end of the heap. */
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198 if (!VirtualFree (real_data_region_end, new_size, MEM_DECOMMIT))
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199 return NULL;
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200 }
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201
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202 data_region_end -= size;
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203 }
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204 /* If size is positive, grow the heap by committing reserved pages. */
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205 else if (size > 0)
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206 {
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207 /* Sanity checks. */
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208 if ((data_region_end + size) >
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209 (data_region_base + get_reserved_heap_size ()))
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210 return NULL;
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211
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212 /* Commit more of our heap. */
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213 if (VirtualAlloc (data_region_end, size, MEM_COMMIT,
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214 PAGE_READWRITE) == NULL)
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215 return NULL;
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216 data_region_end += size;
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217
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218 /* We really only commit full pages, so record where
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219 the real end of committed memory is [cga]. */
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2367
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220 real_data_region_end = (URawbyte *)
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428
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221 ((long) (data_region_end + syspage_mask) & ~syspage_mask);
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222 }
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223
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224 return result;
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225 }
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226
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1330
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227 #if !defined (HEAP_IN_DATA) && !defined (PDUMP)
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428
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228
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229 /* Recreate the heap from the data that was dumped to the executable.
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230 EXECUTABLE_PATH tells us where to find the executable. */
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231 void
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814
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232 recreate_heap (Extbyte *executable_path)
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428
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233 {
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442
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234 /* First reserve the upper part of our heap. (We reserve first
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235 because there have been problems in the past where doing the
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236 mapping first has loaded DLLs into the VA space of our heap.) */
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428
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237
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442
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238 /* Query the region at the end of the committed heap */
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239 void *tmp;
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240 MEMORY_BASIC_INFORMATION info;
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241 DWORD size;
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2367
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242 URawbyte *base = get_heap_end ();
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243 URawbyte *end =
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814
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244 base + get_reserved_heap_size () - get_committed_heap_size ();
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647
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245 VirtualQuery (base, &info, sizeof (info));
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442
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246 if (info.State != MEM_FREE)
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814
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247 {
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248 /* Oops, something has already reserved or commited it, nothing
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249 we can do but exit */
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250 Extbyte buf[256];
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251 sprintf (buf,
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252 "XEmacs cannot start because the memory region required "
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253 "by the heap is not available.\n"
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254 "(BaseAddress = 0x%lx, AllocationBase = 0x%lx, "
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255 "Size = 0x%lx, State = %s, Type = %s)",
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256 info.BaseAddress, info.AllocationBase, info.RegionSize,
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257 info.State == MEM_COMMIT ? "COMMITED" : "RESERVED",
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258 info.Type == MEM_IMAGE ? "IMAGE" :
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259 info.Type == MEM_MAPPED ? "MAPPED" : "PRIVATE");
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260 MessageBoxA (NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP);
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261 exit(1);
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262 }
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442
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263
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264 /* Now try and reserve as much as possible */
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647
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265 size = min (info.RegionSize, (DWORD) (end - base));
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442
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266 tmp = VirtualAlloc (base, size, MEM_RESERVE, PAGE_NOACCESS);
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428
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267 if (!tmp)
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814
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268 {
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269 /* Can't reserve it, nothing we can do but exit */
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270 Extbyte buf[256];
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271 sprintf (buf,
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272 "XEmacs cannot start because it couldn't reserve space "
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273 "required for the heap.\n"
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274 "(VirtualAlloc at 0x%lx of 0x%lx failed (%d))",
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275 base, size, GetLastError());
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276 MessageBoxA (NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP);
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277 exit (1);
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278 }
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428
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279
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280 /* We read in the data for the .bss section from the executable
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281 first and map in the heap from the executable second to prevent
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282 any funny interactions between file I/O and file mapping. */
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283 read_in_bss (executable_path);
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284 map_in_heap (executable_path);
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285
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286 /* Update system version information to match current system. */
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287 cache_system_info ();
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288 }
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1330
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289
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290 #endif /* !defined (HEAP_IN_DATA) && !defined (PDUMP) */
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428
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291
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292 /* Round the heap up to the given alignment. */
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293 void
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294 round_heap (unsigned long align)
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295 {
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296 unsigned long needs_to_be;
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297 unsigned long need_to_alloc;
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298
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299 needs_to_be = (unsigned long) round_to_next (get_heap_end (), align);
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300 need_to_alloc = needs_to_be - (unsigned long) get_heap_end ();
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301
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302 if (need_to_alloc)
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303 sbrk (need_to_alloc);
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304 }
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305
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707
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306 #if ((_MSC_VER >= 1000) && (_MSC_VER < 1300))
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428
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307
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308 /* MSVC 4.2 invokes these functions from mainCRTStartup to initialize
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309 a heap via HeapCreate. They are normally defined by the runtime,
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310 but we override them here so that the unnecessary HeapCreate call
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311 is not performed. */
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312
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707
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313 /* MSVC 7.0 does not allow you to redefine _heap_init or _heap_term. */
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314
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428
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315 int __cdecl
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316 _heap_init (void)
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317 {
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318 /* Stepping through the assembly indicates that mainCRTStartup is
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319 expecting a nonzero success return value. */
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320 return 1;
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321 }
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322
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323 void __cdecl
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324 _heap_term (void)
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325 {
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326 return;
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327 }
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328
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329 #endif
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