Mercurial > hg > xemacs-beta
annotate src/ntheap.c @ 5857:6ec4964c1687
Be more careful about echo_buf arithmetic, event-stream.c.
src/ChangeLog addition:
2015-03-12 Aidan Kehoe <kehoea@parhasard.net>
* event-stream.c (lookup_command_event):
Check whether echo_buf_fill_pointer is negative before using it in
arithmetic, avoiding a crash in GC.
Oddly the old code didn't do this check and didn't crash, but its
echo_buf was from malloced memory, not from our string data, so
there may have been more room to manoeuvre.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Thu, 12 Mar 2015 23:31:42 +0000 |
| parents | 4dee0387b9de |
| children |
| rev | line source |
|---|---|
| 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 | |
|
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6 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 7 under the terms of the GNU General Public License as published by the |
|
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8 Free Software Foundation, either version 3 of the License, or (at your |
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9 option) any later version. |
| 428 | 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 | |
|
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17 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. |
| 428 | 18 Geoff Voelker (voelker@cs.washington.edu) 7-29-94 */ |
| 19 | |
| 20 /* Adapted for XEmacs by David Hobley <david@spook-le0.cia.com.au> */ | |
| 771 | 21 /* Synced with FSF Emacs 19.34.6 by Marc Paquette <marcpa@cam.org> |
| 22 (Note: Sync messages from Marc Paquette may indicate | |
| 23 incomplete synching, so beware.) | |
| 24 */ | |
| 428 | 25 |
| 814 | 26 /* This file has been Mule-ized, Ben Wing, 4-13-02. */ |
| 27 | |
| 428 | 28 #include <config.h> |
| 771 | 29 #include "lisp.h" |
| 428 | 30 |
| 814 | 31 #include "sysdep.h" |
| 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. */ | |
| 2367 | 52 URawbyte * |
| 53 round_to_next (URawbyte *address, unsigned long align) | |
| 428 | 54 { |
| 55 unsigned long tmp; | |
| 56 | |
| 57 tmp = (unsigned long) address; | |
| 58 tmp = (tmp + align - 1) / align; | |
| 59 | |
| 2367 | 60 return (URawbyte *) (tmp * align); |
| 428 | 61 } |
| 62 | |
| 63 /* Info for keeping track of our heap. */ | |
| 2367 | 64 URawbyte *data_region_base = UNINIT_PTR; |
| 65 URawbyte *data_region_end = UNINIT_PTR; | |
| 66 URawbyte *real_data_region_end = UNINIT_PTR; | |
| 428 | 67 unsigned long data_region_size = UNINIT_LONG; |
| 68 unsigned long reserved_heap_size = UNINIT_LONG; | |
| 69 | |
| 70 /* The start of the data segment. */ | |
| 2367 | 71 URawbyte * |
| 428 | 72 get_data_start (void) |
| 73 { | |
| 74 return data_region_base; | |
| 75 } | |
| 76 | |
| 77 /* The end of the data segment. */ | |
| 2367 | 78 URawbyte * |
| 428 | 79 get_data_end (void) |
| 80 { | |
| 81 return data_region_end; | |
| 82 } | |
| 83 | |
| 2367 | 84 static URawbyte * |
| 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 | |
| 2367 | 148 return (URawbyte *) 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; | |
| 2367 | 177 URawbyte *new_data_region_end; |
| 428 | 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); | |
| 2367 | 188 new_data_region_end = (URawbyte *) |
| 428 | 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]. */ | |
| 2367 | 217 real_data_region_end = (URawbyte *) |
| 428 | 218 ((long) (data_region_end + syspage_mask) & ~syspage_mask); |
| 219 } | |
| 220 | |
| 221 return result; | |
| 222 } | |
| 223 | |
| 1330 | 224 #if !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 | |
| 814 | 229 recreate_heap (Extbyte *executable_path) |
| 428 | 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; | |
| 2367 | 239 URawbyte *base = get_heap_end (); |
| 240 URawbyte *end = | |
| 814 | 241 base + get_reserved_heap_size () - get_committed_heap_size (); |
| 647 | 242 VirtualQuery (base, &info, sizeof (info)); |
| 442 | 243 if (info.State != MEM_FREE) |
| 814 | 244 { |
|
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245 /* Oops, something has already reserved or committed it, nothing |
| 814 | 246 we can do but exit */ |
| 247 Extbyte buf[256]; | |
| 248 sprintf (buf, | |
| 249 "XEmacs cannot start because the memory region required " | |
| 250 "by the heap is not available.\n" | |
| 251 "(BaseAddress = 0x%lx, AllocationBase = 0x%lx, " | |
| 252 "Size = 0x%lx, State = %s, Type = %s)", | |
| 253 info.BaseAddress, info.AllocationBase, info.RegionSize, | |
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254 info.State == MEM_COMMIT ? "COMMITTED" : "RESERVED", |
| 814 | 255 info.Type == MEM_IMAGE ? "IMAGE" : |
| 256 info.Type == MEM_MAPPED ? "MAPPED" : "PRIVATE"); | |
| 257 MessageBoxA (NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP); | |
| 258 exit(1); | |
| 259 } | |
| 442 | 260 |
| 261 /* Now try and reserve as much as possible */ | |
| 647 | 262 size = min (info.RegionSize, (DWORD) (end - base)); |
| 442 | 263 tmp = VirtualAlloc (base, size, MEM_RESERVE, PAGE_NOACCESS); |
| 428 | 264 if (!tmp) |
| 814 | 265 { |
| 266 /* Can't reserve it, nothing we can do but exit */ | |
| 267 Extbyte buf[256]; | |
| 268 sprintf (buf, | |
| 269 "XEmacs cannot start because it couldn't reserve space " | |
| 270 "required for the heap.\n" | |
| 271 "(VirtualAlloc at 0x%lx of 0x%lx failed (%d))", | |
| 272 base, size, GetLastError()); | |
| 273 MessageBoxA (NULL, buf, "XEmacs", MB_OK | MB_ICONSTOP); | |
| 274 exit (1); | |
| 275 } | |
| 428 | 276 |
| 277 /* We read in the data for the .bss section from the executable | |
| 278 first and map in the heap from the executable second to prevent | |
| 279 any funny interactions between file I/O and file mapping. */ | |
| 280 read_in_bss (executable_path); | |
| 281 map_in_heap (executable_path); | |
| 282 | |
| 283 /* Update system version information to match current system. */ | |
| 284 cache_system_info (); | |
| 285 } | |
| 1330 | 286 |
| 287 #endif /* !defined (HEAP_IN_DATA) && !defined (PDUMP) */ | |
| 428 | 288 |
| 289 /* Round the heap up to the given alignment. */ | |
| 290 void | |
| 291 round_heap (unsigned long align) | |
| 292 { | |
| 293 unsigned long needs_to_be; | |
| 294 unsigned long need_to_alloc; | |
| 295 | |
| 296 needs_to_be = (unsigned long) round_to_next (get_heap_end (), align); | |
| 297 need_to_alloc = needs_to_be - (unsigned long) get_heap_end (); | |
| 298 | |
| 299 if (need_to_alloc) | |
| 300 sbrk (need_to_alloc); | |
| 301 } | |
| 302 | |
| 707 | 303 #if ((_MSC_VER >= 1000) && (_MSC_VER < 1300)) |
| 428 | 304 |
| 305 /* MSVC 4.2 invokes these functions from mainCRTStartup to initialize | |
| 306 a heap via HeapCreate. They are normally defined by the runtime, | |
| 307 but we override them here so that the unnecessary HeapCreate call | |
| 308 is not performed. */ | |
| 309 | |
| 707 | 310 /* MSVC 7.0 does not allow you to redefine _heap_init or _heap_term. */ |
| 311 | |
| 428 | 312 int __cdecl |
| 313 _heap_init (void) | |
| 314 { | |
| 315 /* Stepping through the assembly indicates that mainCRTStartup is | |
| 316 expecting a nonzero success return value. */ | |
| 317 return 1; | |
| 318 } | |
| 319 | |
| 320 void __cdecl | |
| 321 _heap_term (void) | |
| 322 { | |
| 323 return; | |
| 324 } | |
| 325 | |
| 326 #endif |