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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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24 /* Synced with FSF Emacs 19.34.6 by Marc Paquette <marcpa@cam.org> */
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25
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26 #include <config.h>
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27 #include "lisp.h" /* for VALMASK */
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28
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29 #include <stdlib.h>
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30
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31 #include "ntheap.h"
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32
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33 /* This gives us the page size and the size of the allocation unit on NT. */
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34 SYSTEM_INFO sysinfo_cache;
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35 unsigned long syspage_mask = 0;
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36
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37 /* These are defined to get Emacs to compile, but are not used. */
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38 int edata;
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39 int etext;
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40
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41 /* Cache information describing the NT system for later use. */
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42 void
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43 cache_system_info (void)
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44 {
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45 /* Cache page size, allocation unit, processor type, etc. */
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46 GetSystemInfo (&sysinfo_cache);
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47 syspage_mask = sysinfo_cache.dwPageSize - 1;
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48 }
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49
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50 /* Round ADDRESS up to be aligned with ALIGN. */
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51 unsigned char *
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52 round_to_next (unsigned char *address, unsigned long align)
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53 {
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54 unsigned long tmp;
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55
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56 tmp = (unsigned long) address;
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57 tmp = (tmp + align - 1) / align;
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58
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59 return (unsigned char *) (tmp * align);
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60 }
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61
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62 /* Info for keeping track of our heap. */
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63 unsigned char *data_region_base = UNINIT_PTR;
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64 unsigned char *data_region_end = UNINIT_PTR;
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65 unsigned char *real_data_region_end = UNINIT_PTR;
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66 unsigned long data_region_size = UNINIT_LONG;
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67 unsigned long reserved_heap_size = UNINIT_LONG;
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68
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69 /* The start of the data segment. */
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70 unsigned char *
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71 get_data_start (void)
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72 {
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73 return data_region_base;
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74 }
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75
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76 /* The end of the data segment. */
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77 unsigned char *
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78 get_data_end (void)
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79 {
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80 return data_region_end;
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81 }
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82
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442
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83 static unsigned char *
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428
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84 allocate_heap (void)
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85 {
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86 /* The base address for our GNU malloc heap is chosen in conjunction
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87 with the link settings for temacs.exe which control the stack size,
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88 the initial default process heap size and the executable image base
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89 address. The link settings and the malloc heap base below must all
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90 correspond; the relationship between these values depends on how NT
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91 and Win95 arrange the virtual address space for a process (and on
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92 the size of the code and data segments in temacs.exe).
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93
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94 The most important thing is to make base address for the executable
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95 image high enough to leave enough room between it and the 4MB floor
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96 of the process address space on Win95 for the primary thread stack,
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97 the process default heap, and other assorted odds and ends
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98 (eg. environment strings, private system dll memory etc) that are
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99 allocated before temacs has a chance to grab its malloc arena. The
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100 malloc heap base can then be set several MB higher than the
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101 executable image base, leaving enough room for the code and data
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102 segments.
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103
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104 Because some parts of Emacs can use rather a lot of stack space
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105 (for instance, the regular expression routines can potentially
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106 allocate several MB of stack space) we allow 8MB for the stack.
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107
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108 Allowing 1MB for the default process heap, and 1MB for odds and
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109 ends, we can base the executable at 16MB and still have a generous
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110 safety margin. At the moment, the executable has about 810KB of
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111 code (for x86) and about 550KB of data - on RISC platforms the code
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112 size could be roughly double, so if we allow 4MB for the executable
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113 we will have plenty of room for expansion.
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114
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115 Thus we would like to set the malloc heap base to 20MB. However,
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116 Win95 refuses to allocate the heap starting at this address, so we
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117 set the base to 27MB to make it happy. Since Emacs now leaves
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118 28 bits available for pointers, this lets us use the remainder of
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119 the region below the 256MB line for our malloc arena - 229MB is
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120 still a pretty decent arena to play in! */
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121
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122 unsigned long base = 0x01B00000; /* 27MB */
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438
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123 /* Temporary hack for the non-starting problem - use 28 (256Mb) rather than VALBITS (1Gb) */
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124 unsigned long end = 1 << 28; /* 256MB */
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428
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125 void *ptr = NULL;
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126
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127 #define NTHEAP_PROBE_BASE 1
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128 #if NTHEAP_PROBE_BASE /* This is never normally defined */
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129 /* Try various addresses looking for one the kernel will let us have. */
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130 while (!ptr && (base < end))
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131 {
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132 reserved_heap_size = end - base;
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133 ptr = VirtualAlloc ((void *) base,
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134 get_reserved_heap_size (),
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135 MEM_RESERVE,
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136 PAGE_NOACCESS);
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137 base += 0x00100000; /* 1MB increment */
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138 }
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139 #else
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140 reserved_heap_size = end - base;
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141 ptr = VirtualAlloc ((void *) base,
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142 get_reserved_heap_size (),
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143 MEM_RESERVE,
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144 PAGE_NOACCESS);
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145 #endif
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146
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442
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147 return (unsigned char*) ptr;
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428
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148 }
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149
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150
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151 /* Emulate Unix sbrk. */
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152 void *
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153 sbrk (unsigned long increment)
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154 {
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155 void *result;
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156 long size = (long) increment;
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157
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158 /* Allocate our heap if we haven't done so already. */
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159 if (data_region_base == UNINIT_PTR)
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160 {
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161 data_region_base = allocate_heap ();
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162 if (!data_region_base)
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163 return NULL;
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164
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165 data_region_end = data_region_base;
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166 real_data_region_end = data_region_end;
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167 data_region_size = get_reserved_heap_size ();
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168 }
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169
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170 result = data_region_end;
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171
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172 /* If size is negative, shrink the heap by decommitting pages. */
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173 if (size < 0)
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174 {
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175 int new_size;
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176 unsigned char *new_data_region_end;
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177
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178 size = -size;
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179
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180 /* Sanity checks. */
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181 if ((data_region_end - size) < data_region_base)
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182 return NULL;
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183
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184 /* We can only decommit full pages, so allow for
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185 partial deallocation [cga]. */
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186 new_data_region_end = (data_region_end - size);
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187 new_data_region_end = (unsigned char *)
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188 ((long) (new_data_region_end + syspage_mask) & ~syspage_mask);
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189 new_size = real_data_region_end - new_data_region_end;
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190 real_data_region_end = new_data_region_end;
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191 if (new_size > 0)
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192 {
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193 /* Decommit size bytes from the end of the heap. */
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194 if (!VirtualFree (real_data_region_end, new_size, MEM_DECOMMIT))
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195 return NULL;
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196 }
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197
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198 data_region_end -= size;
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199 }
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200 /* If size is positive, grow the heap by committing reserved pages. */
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201 else if (size > 0)
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202 {
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203 /* Sanity checks. */
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204 if ((data_region_end + size) >
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205 (data_region_base + get_reserved_heap_size ()))
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206 return NULL;
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207
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208 /* Commit more of our heap. */
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209 if (VirtualAlloc (data_region_end, size, MEM_COMMIT,
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210 PAGE_READWRITE) == NULL)
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211 return NULL;
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212 data_region_end += size;
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213
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214 /* We really only commit full pages, so record where
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215 the real end of committed memory is [cga]. */
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216 real_data_region_end = (unsigned char *)
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217 ((long) (data_region_end + syspage_mask) & ~syspage_mask);
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218 }
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219
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220 return result;
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221 }
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222
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440
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223 #if !defined (CANNOT_DUMP) && !defined(HEAP_IN_DATA) && !defined(PDUMP)
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428
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224
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225 /* Recreate the heap from the data that was dumped to the executable.
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226 EXECUTABLE_PATH tells us where to find the executable. */
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227 void
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228 recreate_heap (char *executable_path)
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229 {
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442
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230 /* First reserve the upper part of our heap. (We reserve first
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231 because there have been problems in the past where doing the
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232 mapping first has loaded DLLs into the VA space of our heap.) */
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428
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233
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442
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234 /* Query the region at the end of the committed heap */
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235 void *tmp;
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236 MEMORY_BASIC_INFORMATION info;
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237 DWORD size;
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238 unsigned char* base = get_heap_end ();
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239 unsigned char* end = base + get_reserved_heap_size () - get_committed_heap_size ();
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240 VirtualQuery (base, &info, sizeof info);
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241 if (info.State != MEM_FREE)
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242 {
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243 /* Oops, something has already reserved or commited it, nothing we can do but exit */
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244 char buf[256];
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245 wsprintf(buf,
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246 "XEmacs cannot start because the memory region required by the heap is not available.\n"
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247 "(BaseAddress = 0x%lx, AllocationBase = 0x%lx, Size = 0x%lx, State = %s, Type = %s)",
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248 info.BaseAddress, info.AllocationBase, info.RegionSize,
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249 info.State == MEM_COMMIT ? "COMMITED" : "RESERVED",
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250 info.Type == MEM_IMAGE ? "IMAGE" : info.Type == MEM_MAPPED ? "MAPPED" : "PRIVATE");
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251 MessageBox(NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP);
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252 exit(1);
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253 }
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254
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255 /* Now try and reserve as much as possible */
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256 size = min (info.RegionSize, end - base);
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257 tmp = VirtualAlloc (base, size, MEM_RESERVE, PAGE_NOACCESS);
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428
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258 if (!tmp)
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442
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259 {
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260 /* Can't reserve it, nothing we can do but exit */
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261 char buf[256];
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262 wsprintf(buf,
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263 "XEmacs cannot start because it couldn't reserve space required for the heap.\n"
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264 "(VirtualAlloc at 0x%lx of 0x%lx failed (%d))", base, size, GetLastError());
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265 MessageBox(NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP);
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266 exit (1);
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267 }
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428
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268
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269 /* We read in the data for the .bss section from the executable
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270 first and map in the heap from the executable second to prevent
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271 any funny interactions between file I/O and file mapping. */
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272 read_in_bss (executable_path);
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273 map_in_heap (executable_path);
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274
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275 /* Update system version information to match current system. */
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276 cache_system_info ();
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277 }
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278 #endif /* CANNOT_DUMP */
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279
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280 /* Round the heap up to the given alignment. */
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281 void
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282 round_heap (unsigned long align)
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283 {
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284 unsigned long needs_to_be;
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285 unsigned long need_to_alloc;
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286
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287 needs_to_be = (unsigned long) round_to_next (get_heap_end (), align);
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288 need_to_alloc = needs_to_be - (unsigned long) get_heap_end ();
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289
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290 if (need_to_alloc)
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291 sbrk (need_to_alloc);
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292 }
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293
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294 #if (_MSC_VER >= 1000)
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295
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296 /* MSVC 4.2 invokes these functions from mainCRTStartup to initialize
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297 a heap via HeapCreate. They are normally defined by the runtime,
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298 but we override them here so that the unnecessary HeapCreate call
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299 is not performed. */
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300
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301 int __cdecl
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302 _heap_init (void)
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303 {
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304 /* Stepping through the assembly indicates that mainCRTStartup is
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305 expecting a nonzero success return value. */
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306 return 1;
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307 }
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308
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309 void __cdecl
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310 _heap_term (void)
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311 {
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312 return;
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313 }
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314
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315 #endif
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