|
428
|
1 /* Heap management routines for XEmacs on Windows NT.
|
|
|
2 Copyright (C) 1994 Free Software Foundation, Inc.
|
|
|
3
|
|
|
4 This file is part of XEmacs.
|
|
|
5
|
|
|
6 XEmacs is free software; you can redistribute it and/or modify it
|
|
|
7 under the terms of the GNU General Public License as published by the
|
|
|
8 Free Software Foundation; either version 2, or (at your option) any
|
|
|
9 later version.
|
|
|
10
|
|
|
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
|
|
|
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
14 for more details.
|
|
|
15
|
|
|
16 You should have received a copy of the GNU General Public License
|
|
|
17 along with XEmacs; see the file COPYING. If not, write to the Free
|
|
|
18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
|
|
|
19 02111-1307, USA.
|
|
|
20
|
|
|
21 Geoff Voelker (voelker@cs.washington.edu) 7-29-94 */
|
|
|
22
|
|
|
23 /* Adapted for XEmacs by David Hobley <david@spook-le0.cia.com.au> */
|
|
771
|
24 /* Synced with FSF Emacs 19.34.6 by Marc Paquette <marcpa@cam.org>
|
|
|
25 (Note: Sync messages from Marc Paquette may indicate
|
|
|
26 incomplete synching, so beware.)
|
|
|
27 */
|
|
428
|
28
|
|
|
29 #include <config.h>
|
|
771
|
30 #include "lisp.h"
|
|
428
|
31
|
|
771
|
32 #include "syswindows.h"
|
|
428
|
33
|
|
|
34 /* This gives us the page size and the size of the allocation unit on NT. */
|
|
|
35 SYSTEM_INFO sysinfo_cache;
|
|
|
36 unsigned long syspage_mask = 0;
|
|
|
37
|
|
|
38 /* These are defined to get Emacs to compile, but are not used. */
|
|
|
39 int edata;
|
|
|
40 int etext;
|
|
|
41
|
|
|
42 /* Cache information describing the NT system for later use. */
|
|
|
43 void
|
|
|
44 cache_system_info (void)
|
|
|
45 {
|
|
|
46 /* Cache page size, allocation unit, processor type, etc. */
|
|
|
47 GetSystemInfo (&sysinfo_cache);
|
|
|
48 syspage_mask = sysinfo_cache.dwPageSize - 1;
|
|
|
49 }
|
|
|
50
|
|
|
51 /* Round ADDRESS up to be aligned with ALIGN. */
|
|
|
52 unsigned char *
|
|
|
53 round_to_next (unsigned char *address, unsigned long align)
|
|
|
54 {
|
|
|
55 unsigned long tmp;
|
|
|
56
|
|
|
57 tmp = (unsigned long) address;
|
|
|
58 tmp = (tmp + align - 1) / align;
|
|
|
59
|
|
|
60 return (unsigned char *) (tmp * align);
|
|
|
61 }
|
|
|
62
|
|
|
63 /* Info for keeping track of our heap. */
|
|
|
64 unsigned char *data_region_base = UNINIT_PTR;
|
|
|
65 unsigned char *data_region_end = UNINIT_PTR;
|
|
|
66 unsigned char *real_data_region_end = UNINIT_PTR;
|
|
|
67 unsigned long data_region_size = UNINIT_LONG;
|
|
|
68 unsigned long reserved_heap_size = UNINIT_LONG;
|
|
|
69
|
|
|
70 /* The start of the data segment. */
|
|
|
71 unsigned char *
|
|
|
72 get_data_start (void)
|
|
|
73 {
|
|
|
74 return data_region_base;
|
|
|
75 }
|
|
|
76
|
|
|
77 /* The end of the data segment. */
|
|
|
78 unsigned char *
|
|
|
79 get_data_end (void)
|
|
|
80 {
|
|
|
81 return data_region_end;
|
|
|
82 }
|
|
|
83
|
|
442
|
84 static unsigned char *
|
|
428
|
85 allocate_heap (void)
|
|
|
86 {
|
|
|
87 /* The base address for our GNU malloc heap is chosen in conjunction
|
|
|
88 with the link settings for temacs.exe which control the stack size,
|
|
|
89 the initial default process heap size and the executable image base
|
|
|
90 address. The link settings and the malloc heap base below must all
|
|
|
91 correspond; the relationship between these values depends on how NT
|
|
|
92 and Win95 arrange the virtual address space for a process (and on
|
|
|
93 the size of the code and data segments in temacs.exe).
|
|
|
94
|
|
|
95 The most important thing is to make base address for the executable
|
|
|
96 image high enough to leave enough room between it and the 4MB floor
|
|
|
97 of the process address space on Win95 for the primary thread stack,
|
|
|
98 the process default heap, and other assorted odds and ends
|
|
|
99 (eg. environment strings, private system dll memory etc) that are
|
|
|
100 allocated before temacs has a chance to grab its malloc arena. The
|
|
|
101 malloc heap base can then be set several MB higher than the
|
|
|
102 executable image base, leaving enough room for the code and data
|
|
|
103 segments.
|
|
|
104
|
|
|
105 Because some parts of Emacs can use rather a lot of stack space
|
|
|
106 (for instance, the regular expression routines can potentially
|
|
|
107 allocate several MB of stack space) we allow 8MB for the stack.
|
|
|
108
|
|
|
109 Allowing 1MB for the default process heap, and 1MB for odds and
|
|
|
110 ends, we can base the executable at 16MB and still have a generous
|
|
|
111 safety margin. At the moment, the executable has about 810KB of
|
|
|
112 code (for x86) and about 550KB of data - on RISC platforms the code
|
|
|
113 size could be roughly double, so if we allow 4MB for the executable
|
|
|
114 we will have plenty of room for expansion.
|
|
|
115
|
|
|
116 Thus we would like to set the malloc heap base to 20MB. However,
|
|
|
117 Win95 refuses to allocate the heap starting at this address, so we
|
|
|
118 set the base to 27MB to make it happy. Since Emacs now leaves
|
|
|
119 28 bits available for pointers, this lets us use the remainder of
|
|
|
120 the region below the 256MB line for our malloc arena - 229MB is
|
|
|
121 still a pretty decent arena to play in! */
|
|
|
122
|
|
|
123 unsigned long base = 0x01B00000; /* 27MB */
|
|
438
|
124 /* Temporary hack for the non-starting problem - use 28 (256Mb) rather than VALBITS (1Gb) */
|
|
|
125 unsigned long end = 1 << 28; /* 256MB */
|
|
428
|
126 void *ptr = NULL;
|
|
|
127
|
|
|
128 #define NTHEAP_PROBE_BASE 1
|
|
|
129 #if NTHEAP_PROBE_BASE /* This is never normally defined */
|
|
|
130 /* Try various addresses looking for one the kernel will let us have. */
|
|
|
131 while (!ptr && (base < end))
|
|
|
132 {
|
|
|
133 reserved_heap_size = end - base;
|
|
|
134 ptr = VirtualAlloc ((void *) base,
|
|
|
135 get_reserved_heap_size (),
|
|
|
136 MEM_RESERVE,
|
|
|
137 PAGE_NOACCESS);
|
|
|
138 base += 0x00100000; /* 1MB increment */
|
|
|
139 }
|
|
|
140 #else
|
|
|
141 reserved_heap_size = end - base;
|
|
|
142 ptr = VirtualAlloc ((void *) base,
|
|
|
143 get_reserved_heap_size (),
|
|
|
144 MEM_RESERVE,
|
|
|
145 PAGE_NOACCESS);
|
|
|
146 #endif
|
|
|
147
|
|
442
|
148 return (unsigned char*) ptr;
|
|
428
|
149 }
|
|
|
150
|
|
|
151
|
|
|
152 /* Emulate Unix sbrk. */
|
|
|
153 void *
|
|
|
154 sbrk (unsigned long increment)
|
|
|
155 {
|
|
|
156 void *result;
|
|
|
157 long size = (long) increment;
|
|
|
158
|
|
|
159 /* Allocate our heap if we haven't done so already. */
|
|
|
160 if (data_region_base == UNINIT_PTR)
|
|
|
161 {
|
|
|
162 data_region_base = allocate_heap ();
|
|
|
163 if (!data_region_base)
|
|
|
164 return NULL;
|
|
|
165
|
|
|
166 data_region_end = data_region_base;
|
|
|
167 real_data_region_end = data_region_end;
|
|
|
168 data_region_size = get_reserved_heap_size ();
|
|
|
169 }
|
|
|
170
|
|
|
171 result = data_region_end;
|
|
|
172
|
|
|
173 /* If size is negative, shrink the heap by decommitting pages. */
|
|
|
174 if (size < 0)
|
|
|
175 {
|
|
|
176 int new_size;
|
|
|
177 unsigned char *new_data_region_end;
|
|
|
178
|
|
|
179 size = -size;
|
|
|
180
|
|
|
181 /* Sanity checks. */
|
|
|
182 if ((data_region_end - size) < data_region_base)
|
|
|
183 return NULL;
|
|
|
184
|
|
|
185 /* We can only decommit full pages, so allow for
|
|
|
186 partial deallocation [cga]. */
|
|
|
187 new_data_region_end = (data_region_end - size);
|
|
|
188 new_data_region_end = (unsigned char *)
|
|
|
189 ((long) (new_data_region_end + syspage_mask) & ~syspage_mask);
|
|
|
190 new_size = real_data_region_end - new_data_region_end;
|
|
|
191 real_data_region_end = new_data_region_end;
|
|
|
192 if (new_size > 0)
|
|
|
193 {
|
|
|
194 /* Decommit size bytes from the end of the heap. */
|
|
|
195 if (!VirtualFree (real_data_region_end, new_size, MEM_DECOMMIT))
|
|
|
196 return NULL;
|
|
|
197 }
|
|
|
198
|
|
|
199 data_region_end -= size;
|
|
|
200 }
|
|
|
201 /* If size is positive, grow the heap by committing reserved pages. */
|
|
|
202 else if (size > 0)
|
|
|
203 {
|
|
|
204 /* Sanity checks. */
|
|
|
205 if ((data_region_end + size) >
|
|
|
206 (data_region_base + get_reserved_heap_size ()))
|
|
|
207 return NULL;
|
|
|
208
|
|
|
209 /* Commit more of our heap. */
|
|
|
210 if (VirtualAlloc (data_region_end, size, MEM_COMMIT,
|
|
|
211 PAGE_READWRITE) == NULL)
|
|
|
212 return NULL;
|
|
|
213 data_region_end += size;
|
|
|
214
|
|
|
215 /* We really only commit full pages, so record where
|
|
|
216 the real end of committed memory is [cga]. */
|
|
|
217 real_data_region_end = (unsigned char *)
|
|
|
218 ((long) (data_region_end + syspage_mask) & ~syspage_mask);
|
|
|
219 }
|
|
|
220
|
|
|
221 return result;
|
|
|
222 }
|
|
|
223
|
|
440
|
224 #if !defined (CANNOT_DUMP) && !defined(HEAP_IN_DATA) && !defined(PDUMP)
|
|
428
|
225
|
|
|
226 /* Recreate the heap from the data that was dumped to the executable.
|
|
|
227 EXECUTABLE_PATH tells us where to find the executable. */
|
|
|
228 void
|
|
|
229 recreate_heap (char *executable_path)
|
|
|
230 {
|
|
442
|
231 /* First reserve the upper part of our heap. (We reserve first
|
|
|
232 because there have been problems in the past where doing the
|
|
|
233 mapping first has loaded DLLs into the VA space of our heap.) */
|
|
428
|
234
|
|
442
|
235 /* Query the region at the end of the committed heap */
|
|
|
236 void *tmp;
|
|
|
237 MEMORY_BASIC_INFORMATION info;
|
|
|
238 DWORD size;
|
|
|
239 unsigned char* base = get_heap_end ();
|
|
|
240 unsigned char* end = base + get_reserved_heap_size () - get_committed_heap_size ();
|
|
647
|
241 VirtualQuery (base, &info, sizeof (info));
|
|
442
|
242 if (info.State != MEM_FREE)
|
|
|
243 {
|
|
|
244 /* Oops, something has already reserved or commited it, nothing we can do but exit */
|
|
|
245 char buf[256];
|
|
771
|
246 sprintf (buf,
|
|
442
|
247 "XEmacs cannot start because the memory region required by the heap is not available.\n"
|
|
|
248 "(BaseAddress = 0x%lx, AllocationBase = 0x%lx, Size = 0x%lx, State = %s, Type = %s)",
|
|
|
249 info.BaseAddress, info.AllocationBase, info.RegionSize,
|
|
|
250 info.State == MEM_COMMIT ? "COMMITED" : "RESERVED",
|
|
|
251 info.Type == MEM_IMAGE ? "IMAGE" : info.Type == MEM_MAPPED ? "MAPPED" : "PRIVATE");
|
|
771
|
252 MessageBoxA (NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP);
|
|
442
|
253 exit(1);
|
|
|
254 }
|
|
|
255
|
|
|
256 /* Now try and reserve as much as possible */
|
|
647
|
257 size = min (info.RegionSize, (DWORD) (end - base));
|
|
442
|
258 tmp = VirtualAlloc (base, size, MEM_RESERVE, PAGE_NOACCESS);
|
|
428
|
259 if (!tmp)
|
|
442
|
260 {
|
|
|
261 /* Can't reserve it, nothing we can do but exit */
|
|
|
262 char buf[256];
|
|
771
|
263 sprintf (buf,
|
|
442
|
264 "XEmacs cannot start because it couldn't reserve space required for the heap.\n"
|
|
|
265 "(VirtualAlloc at 0x%lx of 0x%lx failed (%d))", base, size, GetLastError());
|
|
771
|
266 MessageBoxA (NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP);
|
|
442
|
267 exit (1);
|
|
|
268 }
|
|
428
|
269
|
|
|
270 /* We read in the data for the .bss section from the executable
|
|
|
271 first and map in the heap from the executable second to prevent
|
|
|
272 any funny interactions between file I/O and file mapping. */
|
|
|
273 read_in_bss (executable_path);
|
|
|
274 map_in_heap (executable_path);
|
|
|
275
|
|
|
276 /* Update system version information to match current system. */
|
|
|
277 cache_system_info ();
|
|
|
278 }
|
|
|
279 #endif /* CANNOT_DUMP */
|
|
|
280
|
|
|
281 /* Round the heap up to the given alignment. */
|
|
|
282 void
|
|
|
283 round_heap (unsigned long align)
|
|
|
284 {
|
|
|
285 unsigned long needs_to_be;
|
|
|
286 unsigned long need_to_alloc;
|
|
|
287
|
|
|
288 needs_to_be = (unsigned long) round_to_next (get_heap_end (), align);
|
|
|
289 need_to_alloc = needs_to_be - (unsigned long) get_heap_end ();
|
|
|
290
|
|
|
291 if (need_to_alloc)
|
|
|
292 sbrk (need_to_alloc);
|
|
|
293 }
|
|
|
294
|
|
707
|
295 #if ((_MSC_VER >= 1000) && (_MSC_VER < 1300))
|
|
428
|
296
|
|
|
297 /* MSVC 4.2 invokes these functions from mainCRTStartup to initialize
|
|
|
298 a heap via HeapCreate. They are normally defined by the runtime,
|
|
|
299 but we override them here so that the unnecessary HeapCreate call
|
|
|
300 is not performed. */
|
|
|
301
|
|
707
|
302 /* MSVC 7.0 does not allow you to redefine _heap_init or _heap_term. */
|
|
|
303
|
|
428
|
304 int __cdecl
|
|
|
305 _heap_init (void)
|
|
|
306 {
|
|
|
307 /* Stepping through the assembly indicates that mainCRTStartup is
|
|
|
308 expecting a nonzero success return value. */
|
|
|
309 return 1;
|
|
|
310 }
|
|
|
311
|
|
|
312 void __cdecl
|
|
|
313 _heap_term (void)
|
|
|
314 {
|
|
|
315 return;
|
|
|
316 }
|
|
|
317
|
|
|
318 #endif
|
