annotate src/ntheap.c @ 844:047d37eb70d7

[xemacs-hg @ 2002-05-16 13:30:23 by ben] ui fixes for things that were bothering me bytecode.c, editfns.c, lisp.h, lread.c: Fix save-restriction to use markers rather than pseudo-markers (integers representing the amount of text on either side of the region). That way, all inserts are handled correctly, not just those inside old restriction. Add buffer argument to save_restriction_save(). process.c: Clean up very dirty and kludgy code that outputs into a buffer -- use proper unwind protects, etc. font-lock.c: Do save-restriction/widen around the function -- otherwise, incorrect results will ensue when a buffer has been narrowed before a call to e.g. `buffer-syntactic-context' -- something that happens quite often. fileio.c: Look for a handler for make-temp-name. window.c, winslots.h: Try to solve this annoying problem: have two frames displaying the buffer, in different places; in one, temporarily switch away to another buffer and then back -- and you've lost your position; it's reset to the other one in the other frame. My current solution involves window-level caches of buffers and points (also a cache for window-start); when set-window-buffer is called, it looks to see if the buffer was previously visited in the window, and if so, uses the most recent point at that time. (It's a marker, so it handles changes.) #### Note: It could be argued that doing it on the frame level would be better -- e.g. if you visit a buffer temporarily through a grep, and then go back to that buffer, you presumably want the grep's position rather than some previous position provided everything was in the same frame, even though the grep was in another window in the frame. However, doing it on the frame level fails when you have two windows on the same frame. Perhaps we keep both a window and a frame cache, and use the frame cache if there are no other windows on the frame showing the buffer, else the window's cache? This is probably something to be configurable using a specifier. Suggestions please please please? window.c: Clean up a bit code that deals with the annoyance of window-point vs. point. dialog.el: Function to ask a multiple-choice question, automatically choosing a dialog box or minibuffer representation as necessary. Generalized version of yes-or-no-p, y-or-n-p. files.el: Use get-user-response to ask "yes/no/diff" question when recovering. "diff" means that a diff is displayed between the current file and the autosave. (Converts/deconverts escape-quoted as necessary. No more complaints from you, Mr. Turnbull!) One known problem: when a dialog is used, it's modal, so you can't scroll the diff. Will fix soon. lisp-mode.el: If we're filling a string, don't treat semicolon as a comment, which would give very unfriendly results. Uses `buffer-syntactic-context'. simple.el: all changes back to the beginning. (Useful if you've saved the file in the middle of the changes.) simple.el: Add option kill-word-into-kill-ring, which controls whether words deleted with kill-word, backward-kill-word, etc. are "cut" into the kill ring, or "cleared" into nothingness. (My preference is the latter, by far. I'd almost go so far as suggesting we make it the default, as you can always select a word and then cut it if you want it cut.) menubar-items.el: Add option corresponding to kill-word-into-kill-ring.
author ben
date Thu, 16 May 2002 13:30:58 +0000
parents a634e3b7acc8
children 4542b72c005e
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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 (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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29 /* This file has been Mule-ized, Ben Wing, 4-13-02. */
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30
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31 #include <config.h>
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32 #include "lisp.h"
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34 #include "sysdep.h"
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35 #include "syswindows.h"
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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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55 UChar_Binary *
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56 round_to_next (UChar_Binary *address, unsigned long align)
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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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63 return (UChar_Binary *) (tmp * align);
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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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67 UChar_Binary *data_region_base = UNINIT_PTR;
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68 UChar_Binary *data_region_end = UNINIT_PTR;
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69 UChar_Binary *real_data_region_end = UNINIT_PTR;
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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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74 UChar_Binary *
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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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81 UChar_Binary *
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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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87 static UChar_Binary *
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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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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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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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151 return (UChar_Binary *) ptr;
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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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180 UChar_Binary *new_data_region_end;
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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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191 new_data_region_end = (UChar_Binary *)
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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) >
3ecd8885ac67 Import from CVS: tag r21-2-22
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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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220 real_data_region_end = (UChar_Binary *)
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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
814
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227 #if !defined (CANNOT_DUMP) && !defined (HEAP_IN_DATA) && !defined (PDUMP)
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
814
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232 recreate_heap (Extbyte *executable_path)
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233 {
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.) */
428
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237
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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242 UChar_Binary *base = get_heap_end ();
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243 UChar_Binary *end =
a634e3b7acc8 [xemacs-hg @ 2002-04-14 12:41:59 by ben]
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244 base + get_reserved_heap_size () - get_committed_heap_size ();
647
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245 VirtualQuery (base, &info, sizeof (info));
442
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246 if (info.State != MEM_FREE)
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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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ben
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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 }
442
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263
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264 /* Now try and reserve as much as possible */
647
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265 size = min (info.RegionSize, (DWORD) (end - base));
442
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266 tmp = VirtualAlloc (base, size, MEM_RESERVE, PAGE_NOACCESS);
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267 if (!tmp)
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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,
a634e3b7acc8 [xemacs-hg @ 2002-04-14 12:41:59 by ben]
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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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ben
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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 }
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
3ecd8885ac67 Import from CVS: tag r21-2-22
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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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289 #endif /* CANNOT_DUMP */
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290
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291 /* Round the heap up to the given alignment. */
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292 void
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293 round_heap (unsigned long align)
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294 {
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295 unsigned long needs_to_be;
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296 unsigned long need_to_alloc;
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297
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298 needs_to_be = (unsigned long) round_to_next (get_heap_end (), align);
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299 need_to_alloc = needs_to_be - (unsigned long) get_heap_end ();
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300
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
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301 if (need_to_alloc)
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302 sbrk (need_to_alloc);
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
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303 }
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304
707
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diff changeset
305 #if ((_MSC_VER >= 1000) && (_MSC_VER < 1300))
428
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306
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307 /* MSVC 4.2 invokes these functions from mainCRTStartup to initialize
3ecd8885ac67 Import from CVS: tag r21-2-22
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parents:
diff changeset
308 a heap via HeapCreate. They are normally defined by the runtime,
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
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309 but we override them here so that the unnecessary HeapCreate call
3ecd8885ac67 Import from CVS: tag r21-2-22
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310 is not performed. */
3ecd8885ac67 Import from CVS: tag r21-2-22
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diff changeset
311
707
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andyp
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diff changeset
312 /* MSVC 7.0 does not allow you to redefine _heap_init or _heap_term. */
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diff changeset
313
428
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diff changeset
314 int __cdecl
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315 _heap_init (void)
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316 {
3ecd8885ac67 Import from CVS: tag r21-2-22
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317 /* Stepping through the assembly indicates that mainCRTStartup is
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
diff changeset
318 expecting a nonzero success return value. */
3ecd8885ac67 Import from CVS: tag r21-2-22
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319 return 1;
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
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320 }
3ecd8885ac67 Import from CVS: tag r21-2-22
cvs
parents:
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321
3ecd8885ac67 Import from CVS: tag r21-2-22
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322 void __cdecl
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323 _heap_term (void)
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324 {
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325 return;
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326 }
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327
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328 #endif