Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/os.hpp @ 14692:8504393de66b
8037043: put Method flag bits in predictable positions
Reviewed-by: kvn, coleenp
author | twisti |
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date | Tue, 11 Mar 2014 14:54:47 -0700 |
parents | bb9356ec5967 |
children | d8041d695d19 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_OS_HPP |
26 #define SHARE_VM_RUNTIME_OS_HPP | |
27 | |
28 #include "jvmtifiles/jvmti.h" | |
29 #include "runtime/atomic.hpp" | |
30 #include "runtime/extendedPC.hpp" | |
31 #include "runtime/handles.hpp" | |
32 #include "utilities/top.hpp" | |
33 #ifdef TARGET_OS_FAMILY_linux | |
34 # include "jvm_linux.h" | |
11151 | 35 # include <setjmp.h> |
1972 | 36 #endif |
37 #ifdef TARGET_OS_FAMILY_solaris | |
38 # include "jvm_solaris.h" | |
11151 | 39 # include <setjmp.h> |
1972 | 40 #endif |
41 #ifdef TARGET_OS_FAMILY_windows | |
42 # include "jvm_windows.h" | |
43 #endif | |
14411 | 44 #ifdef TARGET_OS_FAMILY_aix |
45 # include "jvm_aix.h" | |
46 # include <setjmp.h> | |
47 #endif | |
3960 | 48 #ifdef TARGET_OS_FAMILY_bsd |
49 # include "jvm_bsd.h" | |
11151 | 50 # include <setjmp.h> |
3960 | 51 #endif |
1972 | 52 |
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53 class AgentLibrary; |
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54 |
0 | 55 // os defines the interface to operating system; this includes traditional |
56 // OS services (time, I/O) as well as other functionality with system- | |
57 // dependent code. | |
58 | |
59 typedef void (*dll_func)(...); | |
60 | |
61 class Thread; | |
62 class JavaThread; | |
63 class Event; | |
64 class DLL; | |
65 class FileHandle; | |
141 | 66 template<class E> class GrowableArray; |
0 | 67 |
68 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
69 | |
70 // Platform-independent error return values from OS functions | |
71 enum OSReturn { | |
72 OS_OK = 0, // Operation was successful | |
73 OS_ERR = -1, // Operation failed | |
74 OS_INTRPT = -2, // Operation was interrupted | |
75 OS_TIMEOUT = -3, // Operation timed out | |
76 OS_NOMEM = -5, // Operation failed for lack of memory | |
77 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
78 }; | |
79 | |
80 enum ThreadPriority { // JLS 20.20.1-3 | |
81 NoPriority = -1, // Initial non-priority value | |
82 MinPriority = 1, // Minimum priority | |
83 NormPriority = 5, // Normal (non-daemon) priority | |
84 NearMaxPriority = 9, // High priority, used for VMThread | |
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85 MaxPriority = 10, // Highest priority, used for WatcherThread |
0 | 86 // ensures that VMThread doesn't starve profiler |
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87 CriticalPriority = 11 // Critical thread priority |
0 | 88 }; |
89 | |
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90 // Executable parameter flag for os::commit_memory() and |
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91 // os::commit_memory_or_exit(). |
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92 const bool ExecMem = true; |
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93 |
0 | 94 // Typedef for structured exception handling support |
95 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
96 | |
97 class os: AllStatic { | |
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98 friend class VMStructs; |
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99 |
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100 public: |
0 | 101 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) |
102 | |
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103 private: |
0 | 104 static OSThread* _starting_thread; |
105 static address _polling_page; | |
106 static volatile int32_t * _mem_serialize_page; | |
107 static uintptr_t _serialize_page_mask; | |
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108 public: |
0 | 109 static size_t _page_sizes[page_sizes_max]; |
110 | |
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111 private: |
0 | 112 static void init_page_sizes(size_t default_page_size) { |
113 _page_sizes[0] = default_page_size; | |
114 _page_sizes[1] = 0; // sentinel | |
115 } | |
116 | |
6197 | 117 static char* pd_reserve_memory(size_t bytes, char* addr = 0, |
118 size_t alignment_hint = 0); | |
119 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); | |
120 static void pd_split_reserved_memory(char *base, size_t size, | |
121 size_t split, bool realloc); | |
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122 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); |
6197 | 123 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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124 bool executable); |
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125 // Same as pd_commit_memory() that either succeeds or calls |
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126 // vm_exit_out_of_memory() with the specified mesg. |
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127 static void pd_commit_memory_or_exit(char* addr, size_t bytes, |
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128 bool executable, const char* mesg); |
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129 static void pd_commit_memory_or_exit(char* addr, size_t size, |
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130 size_t alignment_hint, |
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131 bool executable, const char* mesg); |
6197 | 132 static bool pd_uncommit_memory(char* addr, size_t bytes); |
133 static bool pd_release_memory(char* addr, size_t bytes); | |
134 | |
135 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, | |
136 char *addr, size_t bytes, bool read_only = false, | |
137 bool allow_exec = false); | |
138 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, | |
139 char *addr, size_t bytes, bool read_only, | |
140 bool allow_exec); | |
141 static bool pd_unmap_memory(char *addr, size_t bytes); | |
142 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); | |
143 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
144 | |
145 | |
0 | 146 public: |
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147 static void init(void); // Called before command line parsing |
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148 static void init_before_ergo(void); // Called after command line parsing |
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149 // before VM ergonomics processing. |
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150 static jint init_2(void); // Called after command line parsing |
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151 // and VM ergonomics processing |
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152 static void init_globals(void) { // Called from init_globals() in init.cpp |
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153 init_globals_ext(); |
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154 } |
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155 static void init_3(void); // Called at the end of vm init |
0 | 156 |
157 // File names are case-insensitive on windows only | |
158 // Override me as needed | |
159 static int file_name_strcmp(const char* s1, const char* s2); | |
160 | |
161 static bool getenv(const char* name, char* buffer, int len); | |
162 static bool have_special_privileges(); | |
163 | |
164 static jlong javaTimeMillis(); | |
165 static jlong javaTimeNanos(); | |
166 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
167 static void run_periodic_checks(); | |
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168 static bool supports_monotonic_clock(); |
0 | 169 |
170 | |
171 // Returns the elapsed time in seconds since the vm started. | |
172 static double elapsedTime(); | |
173 | |
174 // Returns real time in seconds since an arbitrary point | |
175 // in the past. | |
176 static bool getTimesSecs(double* process_real_time, | |
177 double* process_user_time, | |
178 double* process_system_time); | |
179 | |
180 // Interface to the performance counter | |
181 static jlong elapsed_counter(); | |
182 static jlong elapsed_frequency(); | |
183 | |
342
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184 // The "virtual time" of a thread is the amount of time a thread has |
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185 // actually run. The first function indicates whether the OS supports |
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186 // this functionality for the current thread, and if so: |
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187 // * the second enables vtime tracking (if that is required). |
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188 // * the third tells whether vtime is enabled. |
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189 // * the fourth returns the elapsed virtual time for the current |
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190 // thread. |
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191 static bool supports_vtime(); |
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192 static bool enable_vtime(); |
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193 static bool vtime_enabled(); |
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194 static double elapsedVTime(); |
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195 |
0 | 196 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
197 // It is MT safe, but not async-safe, as reading time zone | |
198 // information may require a lock on some platforms. | |
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199 static char* local_time_string(char *buf, size_t buflen); |
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200 static struct tm* localtime_pd (const time_t* clock, struct tm* res); |
0 | 201 // Fill in buffer with current local time as an ISO-8601 string. |
202 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
203 // Returns buffer, or NULL if it failed. | |
204 static char* iso8601_time(char* buffer, size_t buffer_length); | |
205 | |
206 // Interface for detecting multiprocessor system | |
207 static inline bool is_MP() { | |
208 assert(_processor_count > 0, "invalid processor count"); | |
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209 return _processor_count > 1 || AssumeMP; |
0 | 210 } |
211 static julong available_memory(); | |
212 static julong physical_memory(); | |
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213 static bool has_allocatable_memory_limit(julong* limit); |
0 | 214 static bool is_server_class_machine(); |
215 | |
216 // number of CPUs | |
217 static int processor_count() { | |
218 return _processor_count; | |
219 } | |
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220 static void set_processor_count(int count) { _processor_count = count; } |
0 | 221 |
222 // Returns the number of CPUs this process is currently allowed to run on. | |
223 // Note that on some OSes this can change dynamically. | |
224 static int active_processor_count(); | |
225 | |
226 // Bind processes to processors. | |
227 // This is a two step procedure: | |
228 // first you generate a distribution of processes to processors, | |
229 // then you bind processes according to that distribution. | |
230 // Compute a distribution for number of processes to processors. | |
231 // Stores the processor id's into the distribution array argument. | |
232 // Returns true if it worked, false if it didn't. | |
233 static bool distribute_processes(uint length, uint* distribution); | |
234 // Binds the current process to a processor. | |
235 // Returns true if it worked, false if it didn't. | |
236 static bool bind_to_processor(uint processor_id); | |
237 | |
4006 | 238 // Give a name to the current thread. |
239 static void set_native_thread_name(const char *name); | |
240 | |
0 | 241 // Interface for stack banging (predetect possible stack overflow for |
242 // exception processing) There are guard pages, and above that shadow | |
243 // pages for stack overflow checking. | |
244 static bool uses_stack_guard_pages(); | |
245 static bool allocate_stack_guard_pages(); | |
246 static void bang_stack_shadow_pages(); | |
247 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
248 | |
249 // OS interface to Virtual Memory | |
250 | |
251 // Return the default page size. | |
252 static int vm_page_size(); | |
253 | |
254 // Return the page size to use for a region of memory. The min_pages argument | |
255 // is a hint intended to limit fragmentation; it says the returned page size | |
256 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
257 // this routine may return a size larger than region_max_size / min_pages. | |
258 // | |
259 // The current implementation ignores min_pages if a larger page size is an | |
260 // exact multiple of both region_min_size and region_max_size. This allows | |
261 // larger pages to be used when doing so would not cause fragmentation; in | |
262 // particular, a single page can be used when region_min_size == | |
263 // region_max_size == a supported page size. | |
264 static size_t page_size_for_region(size_t region_min_size, | |
265 size_t region_max_size, | |
266 uint min_pages); | |
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267 // Return the largest page size that can be used |
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268 static size_t max_page_size() { |
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269 // The _page_sizes array is sorted in descending order. |
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270 return _page_sizes[0]; |
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271 } |
0 | 272 |
3859 | 273 // Methods for tracing page sizes returned by the above method; enabled by |
0 | 274 // TracePageSizes. The region_{min,max}_size parameters should be the values |
275 // passed to page_size_for_region() and page_size should be the result of that | |
276 // call. The (optional) base and size parameters should come from the | |
277 // ReservedSpace base() and size() methods. | |
3859 | 278 static void trace_page_sizes(const char* str, const size_t* page_sizes, |
279 int count) PRODUCT_RETURN; | |
0 | 280 static void trace_page_sizes(const char* str, const size_t region_min_size, |
281 const size_t region_max_size, | |
282 const size_t page_size, | |
283 const char* base = NULL, | |
284 const size_t size = 0) PRODUCT_RETURN; | |
285 | |
286 static int vm_allocation_granularity(); | |
287 static char* reserve_memory(size_t bytes, char* addr = 0, | |
288 size_t alignment_hint = 0); | |
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289 static char* reserve_memory(size_t bytes, char* addr, |
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290 size_t alignment_hint, MEMFLAGS flags); |
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291 static char* reserve_memory_aligned(size_t size, size_t alignment); |
0 | 292 static char* attempt_reserve_memory_at(size_t bytes, char* addr); |
293 static void split_reserved_memory(char *base, size_t size, | |
294 size_t split, bool realloc); | |
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295 static bool commit_memory(char* addr, size_t bytes, bool executable); |
656 | 296 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, |
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297 bool executable); |
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298 // Same as commit_memory() that either succeeds or calls |
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299 // vm_exit_out_of_memory() with the specified mesg. |
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300 static void commit_memory_or_exit(char* addr, size_t bytes, |
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301 bool executable, const char* mesg); |
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302 static void commit_memory_or_exit(char* addr, size_t size, |
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303 size_t alignment_hint, |
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304 bool executable, const char* mesg); |
0 | 305 static bool uncommit_memory(char* addr, size_t bytes); |
306 static bool release_memory(char* addr, size_t bytes); | |
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307 |
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308 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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309 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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310 bool is_committed = true); |
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311 |
0 | 312 static bool guard_memory(char* addr, size_t bytes); |
313 static bool unguard_memory(char* addr, size_t bytes); | |
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314 static bool create_stack_guard_pages(char* addr, size_t bytes); |
6197 | 315 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); |
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316 static bool remove_stack_guard_pages(char* addr, size_t bytes); |
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317 |
0 | 318 static char* map_memory(int fd, const char* file_name, size_t file_offset, |
319 char *addr, size_t bytes, bool read_only = false, | |
320 bool allow_exec = false); | |
321 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
322 char *addr, size_t bytes, bool read_only, | |
323 bool allow_exec); | |
324 static bool unmap_memory(char *addr, size_t bytes); | |
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325 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); |
0 | 326 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); |
327 | |
328 // NUMA-specific interface | |
141 | 329 static bool numa_has_static_binding(); |
330 static bool numa_has_group_homing(); | |
331 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
0 | 332 static void numa_make_global(char *addr, size_t bytes); |
333 static size_t numa_get_groups_num(); | |
334 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
335 static bool numa_topology_changed(); | |
336 static int numa_get_group_id(); | |
337 | |
338 // Page manipulation | |
339 struct page_info { | |
340 size_t size; | |
341 int lgrp_id; | |
342 }; | |
343 static bool get_page_info(char *start, page_info* info); | |
344 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
345 | |
346 static char* non_memory_address_word(); | |
347 // reserve, commit and pin the entire memory region | |
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348 static char* reserve_memory_special(size_t size, size_t alignment, |
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349 char* addr, bool executable); |
0 | 350 static bool release_memory_special(char* addr, size_t bytes); |
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351 static void large_page_init(); |
0 | 352 static size_t large_page_size(); |
353 static bool can_commit_large_page_memory(); | |
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354 static bool can_execute_large_page_memory(); |
0 | 355 |
356 // OS interface to polling page | |
357 static address get_polling_page() { return _polling_page; } | |
358 static void set_polling_page(address page) { _polling_page = page; } | |
359 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
360 static void make_polling_page_unreadable(); | |
361 static void make_polling_page_readable(); | |
362 | |
363 // Routines used to serialize the thread state without using membars | |
364 static void serialize_thread_states(); | |
365 | |
366 // Since we write to the serialize page from every thread, we | |
367 // want stores to be on unique cache lines whenever possible | |
368 // in order to minimize CPU cross talk. We pre-compute the | |
369 // amount to shift the thread* to make this offset unique to | |
370 // each thread. | |
371 static int get_serialize_page_shift_count() { | |
372 return SerializePageShiftCount; | |
373 } | |
374 | |
375 static void set_serialize_page_mask(uintptr_t mask) { | |
376 _serialize_page_mask = mask; | |
377 } | |
378 | |
379 static unsigned int get_serialize_page_mask() { | |
380 return _serialize_page_mask; | |
381 } | |
382 | |
383 static void set_memory_serialize_page(address page); | |
384 | |
385 static address get_memory_serialize_page() { | |
386 return (address)_mem_serialize_page; | |
387 } | |
388 | |
389 static inline void write_memory_serialize_page(JavaThread *thread) { | |
390 uintptr_t page_offset = ((uintptr_t)thread >> | |
391 get_serialize_page_shift_count()) & | |
392 get_serialize_page_mask(); | |
393 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
394 } | |
395 | |
396 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
397 if (UseMembar) return false; | |
1078 | 398 // Previously this function calculated the exact address of this |
399 // thread's serialize page, and checked if the faulting address | |
400 // was equal. However, some platforms mask off faulting addresses | |
401 // to the page size, so now we just check that the address is | |
402 // within the page. This makes the thread argument unnecessary, | |
14309 | 403 // but we retain the NULL check to preserve existing behavior. |
0 | 404 if (thread == NULL) return false; |
1078 | 405 address page = (address) _mem_serialize_page; |
406 return addr >= page && addr < (page + os::vm_page_size()); | |
0 | 407 } |
408 | |
409 static void block_on_serialize_page_trap(); | |
410 | |
411 // threads | |
412 | |
413 enum ThreadType { | |
414 vm_thread, | |
415 cgc_thread, // Concurrent GC thread | |
416 pgc_thread, // Parallel GC thread | |
417 java_thread, | |
418 compiler_thread, | |
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419 watcher_thread, |
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420 os_thread |
0 | 421 }; |
422 | |
423 static bool create_thread(Thread* thread, | |
424 ThreadType thr_type, | |
425 size_t stack_size = 0); | |
426 static bool create_main_thread(JavaThread* thread); | |
427 static bool create_attached_thread(JavaThread* thread); | |
428 static void pd_start_thread(Thread* thread); | |
429 static void start_thread(Thread* thread); | |
430 | |
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431 static void initialize_thread(Thread* thr); |
0 | 432 static void free_thread(OSThread* osthread); |
433 | |
434 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
435 static intx current_thread_id(); | |
436 static int current_process_id(); | |
437 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
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438 // Short standalone OS sleep suitable for slow path spin loop. |
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439 // Ignores Thread.interrupt() (so keep it short). |
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440 // ms = 0, will sleep for the least amount of time allowed by the OS. |
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441 static void naked_short_sleep(jlong ms); |
0 | 442 static void infinite_sleep(); // never returns, use with CAUTION |
443 static void yield(); // Yields to all threads with same priority | |
444 enum YieldResult { | |
445 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
446 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
447 // platform-specific yield return immediately | |
448 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
449 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
450 // yield that can be used in lieu of blocking. | |
451 } ; | |
452 static YieldResult NakedYield () ; | |
453 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
454 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
455 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
456 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
457 | |
458 static void interrupt(Thread* thread); | |
459 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
460 | |
461 static int pd_self_suspend_thread(Thread* thread); | |
462 | |
463 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
464 static frame fetch_frame_from_context(void* ucVoid); | |
465 | |
466 static ExtendedPC get_thread_pc(Thread *thread); | |
467 static void breakpoint(); | |
468 | |
469 static address current_stack_pointer(); | |
470 static address current_stack_base(); | |
471 static size_t current_stack_size(); | |
472 | |
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473 static void verify_stack_alignment() PRODUCT_RETURN; |
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474 |
0 | 475 static int message_box(const char* title, const char* message); |
476 static char* do_you_want_to_debug(const char* message); | |
477 | |
478 // run cmd in a separate process and return its exit code; or -1 on failures | |
479 static int fork_and_exec(char *cmd); | |
480 | |
481 // Set file to send error reports. | |
482 static void set_error_file(const char *logfile); | |
483 | |
484 // os::exit() is merged with vm_exit() | |
485 // static void exit(int num); | |
486 | |
487 // Terminate the VM, but don't exit the process | |
488 static void shutdown(); | |
489 | |
490 // Terminate with an error. Default is to generate a core file on platforms | |
491 // that support such things. This calls shutdown() and then aborts. | |
492 static void abort(bool dump_core = true); | |
493 | |
494 // Die immediately, no exit hook, no abort hook, no cleanup. | |
495 static void die(); | |
496 | |
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497 // File i/o operations |
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498 static const int default_file_open_flags(); |
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499 static int open(const char *path, int oflag, int mode); |
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500 static FILE* open(int fd, const char* mode); |
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501 static int close(int fd); |
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502 static jlong lseek(int fd, jlong offset, int whence); |
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503 static char* native_path(char *path); |
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504 static int ftruncate(int fd, jlong length); |
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505 static int fsync(int fd); |
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506 static int available(int fd, jlong *bytes); |
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507 |
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508 //File i/o operations |
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509 |
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510 static size_t read(int fd, void *buf, unsigned int nBytes); |
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511 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); |
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512 static size_t write(int fd, const void *buf, unsigned int nBytes); |
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513 |
0 | 514 // Reading directories. |
515 static DIR* opendir(const char* dirname); | |
516 static int readdir_buf_size(const char *path); | |
517 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
518 static int closedir(DIR* dirp); | |
519 | |
520 // Dynamic library extension | |
521 static const char* dll_file_extension(); | |
522 | |
523 static const char* get_temp_directory(); | |
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524 static const char* get_current_directory(char *buf, size_t buflen); |
0 | 525 |
242 | 526 // Builds a platform-specific full library path given a ld path and lib name |
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527 // Returns true if buffer contains full path to existing file, false otherwise |
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528 static bool dll_build_name(char* buffer, size_t size, |
242 | 529 const char* pathname, const char* fname); |
530 | |
0 | 531 // Symbol lookup, find nearest function name; basically it implements |
532 // dladdr() for all platforms. Name of the nearest function is copied | |
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533 // to buf. Distance from its base address is optionally returned as offset. |
0 | 534 // If function name is not found, buf[0] is set to '\0' and offset is |
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535 // set to -1 (if offset is non-NULL). |
0 | 536 static bool dll_address_to_function_name(address addr, char* buf, |
537 int buflen, int* offset); | |
538 | |
539 // Locate DLL/DSO. On success, full path of the library is copied to | |
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540 // buf, and offset is optionally set to be the distance between addr |
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541 // and the library's base address. On failure, buf[0] is set to '\0' |
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542 // and offset is set to -1 (if offset is non-NULL). |
0 | 543 static bool dll_address_to_library_name(address addr, char* buf, |
544 int buflen, int* offset); | |
545 | |
546 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
547 static bool address_is_in_vm(address addr); | |
548 | |
549 // Loads .dll/.so and | |
550 // in case of error it checks if .dll/.so was built for the | |
14309 | 551 // same architecture as HotSpot is running on |
0 | 552 static void* dll_load(const char *name, char *ebuf, int ebuflen); |
553 | |
242 | 554 // lookup symbol in a shared library |
555 static void* dll_lookup(void* handle, const char* name); | |
556 | |
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557 // Unload library |
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558 static void dll_unload(void *lib); |
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559 |
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560 // Return the handle of this process |
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561 static void* get_default_process_handle(); |
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562 |
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563 // Check for static linked agent library |
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564 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], |
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565 size_t syms_len); |
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566 |
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567 // Find agent entry point |
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568 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, |
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569 const char *syms[], size_t syms_len); |
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570 |
0 | 571 // Print out system information; they are called by fatal error handler. |
572 // Output format may be different on different platforms. | |
573 static void print_os_info(outputStream* st); | |
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574 static void print_os_info_brief(outputStream* st); |
0 | 575 static void print_cpu_info(outputStream* st); |
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576 static void pd_print_cpu_info(outputStream* st); |
0 | 577 static void print_memory_info(outputStream* st); |
578 static void print_dll_info(outputStream* st); | |
579 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
580 static void print_context(outputStream* st, void* context); | |
1907 | 581 static void print_register_info(outputStream* st, void* context); |
0 | 582 static void print_siginfo(outputStream* st, void* siginfo); |
583 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
584 static void print_date_and_time(outputStream* st); | |
585 | |
1907 | 586 static void print_location(outputStream* st, intptr_t x, bool verbose = false); |
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587 static size_t lasterror(char *buf, size_t len); |
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588 static int get_last_error(); |
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589 |
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590 // Determines whether the calling process is being debugged by a user-mode debugger. |
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591 static bool is_debugger_attached(); |
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592 |
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593 // wait for a key press if PauseAtExit is set |
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594 static void wait_for_keypress_at_exit(void); |
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595 |
0 | 596 // The following two functions are used by fatal error handler to trace |
597 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
598 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
599 // OS/compiler may have different convention or provide different API to | |
600 // walk C frames. | |
601 // | |
602 // We don't attempt to become a debugger, so we only follow frames if that | |
603 // does not require a lookup in the unwind table, which is part of the binary | |
604 // file but may be unsafe to read after a fatal error. So on x86, we can | |
605 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
606 // possible to walk C stack without having the unwind table. | |
607 static bool is_first_C_frame(frame *fr); | |
608 static frame get_sender_for_C_frame(frame *fr); | |
609 | |
610 // return current frame. pc() and sp() are set to NULL on failure. | |
611 static frame current_frame(); | |
612 | |
613 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
614 | |
615 // returns a string to describe the exception/signal; | |
616 // returns NULL if exception_code is not an OS exception/signal. | |
617 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
618 | |
619 // Returns native Java library, loads if necessary | |
620 static void* native_java_library(); | |
621 | |
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622 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) |
0 | 623 static void jvm_path(char *buf, jint buflen); |
624 | |
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625 // Returns true if we are running in a headless jre. |
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626 static bool is_headless_jre(); |
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627 |
0 | 628 // JNI names |
629 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
630 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
631 | |
632 // File conventions | |
633 static const char* file_separator(); | |
634 static const char* line_separator(); | |
635 static const char* path_separator(); | |
636 | |
637 // Init os specific system properties values | |
638 static void init_system_properties_values(); | |
639 | |
640 // IO operations, non-JVM_ version. | |
641 static int stat(const char* path, struct stat* sbuf); | |
642 static bool dir_is_empty(const char* path); | |
643 | |
644 // IO operations on binary files | |
645 static int create_binary_file(const char* path, bool rewrite_existing); | |
646 static jlong current_file_offset(int fd); | |
647 static jlong seek_to_file_offset(int fd, jlong offset); | |
648 | |
649 // Thread Local Storage | |
650 static int allocate_thread_local_storage(); | |
651 static void thread_local_storage_at_put(int index, void* value); | |
652 static void* thread_local_storage_at(int index); | |
653 static void free_thread_local_storage(int index); | |
654 | |
6197 | 655 // Stack walk |
656 static address get_caller_pc(int n = 0); | |
657 | |
0 | 658 // General allocation (must be MT-safe) |
6197 | 659 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0); |
660 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0); | |
661 static void free (void *memblock, MEMFLAGS flags = mtNone); | |
0 | 662 static bool check_heap(bool force = false); // verify C heap integrity |
6197 | 663 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup |
0 | 664 |
665 #ifndef PRODUCT | |
2250 | 666 static julong num_mallocs; // # of calls to malloc/realloc |
667 static julong alloc_bytes; // # of bytes allocated | |
668 static julong num_frees; // # of calls to free | |
669 static julong free_bytes; // # of bytes freed | |
0 | 670 #endif |
671 | |
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672 // SocketInterface (ex HPI SocketInterface ) |
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673 static int socket(int domain, int type, int protocol); |
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674 static int socket_close(int fd); |
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675 static int socket_shutdown(int fd, int howto); |
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676 static int recv(int fd, char* buf, size_t nBytes, uint flags); |
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677 static int send(int fd, char* buf, size_t nBytes, uint flags); |
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678 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); |
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679 static int timeout(int fd, long timeout); |
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680 static int listen(int fd, int count); |
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681 static int connect(int fd, struct sockaddr* him, socklen_t len); |
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682 static int bind(int fd, struct sockaddr* him, socklen_t len); |
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683 static int accept(int fd, struct sockaddr* him, socklen_t* len); |
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684 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, |
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685 struct sockaddr* from, socklen_t* fromlen); |
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686 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); |
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687 static int sendto(int fd, char* buf, size_t len, uint flags, |
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688 struct sockaddr* to, socklen_t tolen); |
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689 static int socket_available(int fd, jint* pbytes); |
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690 |
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691 static int get_sock_opt(int fd, int level, int optname, |
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692 char* optval, socklen_t* optlen); |
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693 static int set_sock_opt(int fd, int level, int optname, |
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694 const char* optval, socklen_t optlen); |
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695 static int get_host_name(char* name, int namelen); |
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696 |
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697 static struct hostent* get_host_by_name(char* name); |
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698 |
0 | 699 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) |
700 static void signal_init(); | |
701 static void signal_init_pd(); | |
702 static void signal_notify(int signal_number); | |
703 static void* signal(int signal_number, void* handler); | |
704 static void signal_raise(int signal_number); | |
705 static int signal_wait(); | |
706 static int signal_lookup(); | |
707 static void* user_handler(); | |
708 static void terminate_signal_thread(); | |
709 static int sigexitnum_pd(); | |
710 | |
711 // random number generation | |
712 static long random(); // return 32bit pseudorandom number | |
713 static void init_random(long initval); // initialize random sequence | |
714 | |
715 // Structured OS Exception support | |
716 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
717 | |
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718 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits |
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719 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); |
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720 |
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721 // Get the default path to the core file |
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722 // Returns the length of the string |
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723 static int get_core_path(char* buffer, size_t bufferSize); |
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724 |
0 | 725 // JVMTI & JVM monitoring and management support |
726 // The thread_cpu_time() and current_thread_cpu_time() are only | |
727 // supported if is_thread_cpu_time_supported() returns true. | |
728 // They are not supported on Solaris T1. | |
729 | |
730 // Thread CPU Time - return the fast estimate on a platform | |
731 // On Solaris - call gethrvtime (fast) - user time only | |
732 // On Linux - fast clock_gettime where available - user+sys | |
733 // - otherwise: very slow /proc fs - user+sys | |
734 // On Windows - GetThreadTimes - user+sys | |
735 static jlong current_thread_cpu_time(); | |
736 static jlong thread_cpu_time(Thread* t); | |
737 | |
738 // Thread CPU Time with user_sys_cpu_time parameter. | |
739 // | |
740 // If user_sys_cpu_time is true, user+sys time is returned. | |
741 // Otherwise, only user time is returned | |
742 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
743 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
744 | |
745 // Return a bunch of info about the timers. | |
746 // Note that the returned info for these two functions may be different | |
747 // on some platforms | |
748 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
749 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
750 | |
751 static bool is_thread_cpu_time_supported(); | |
752 | |
753 // System loadavg support. Returns -1 if load average cannot be obtained. | |
754 static int loadavg(double loadavg[], int nelem); | |
755 | |
756 // Hook for os specific jvm options that we don't want to abort on seeing | |
757 static bool obsolete_option(const JavaVMOption *option); | |
758 | |
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759 // Extensions |
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760 #include "runtime/os_ext.hpp" |
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761 |
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762 public: |
11151 | 763 class CrashProtectionCallback : public StackObj { |
764 public: | |
765 virtual void call() = 0; | |
766 }; | |
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767 |
0 | 768 // Platform dependent stuff |
1972 | 769 #ifdef TARGET_OS_FAMILY_linux |
770 # include "os_linux.hpp" | |
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771 # include "os_posix.hpp" |
1972 | 772 #endif |
773 #ifdef TARGET_OS_FAMILY_solaris | |
774 # include "os_solaris.hpp" | |
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775 # include "os_posix.hpp" |
1972 | 776 #endif |
777 #ifdef TARGET_OS_FAMILY_windows | |
778 # include "os_windows.hpp" | |
779 #endif | |
14411 | 780 #ifdef TARGET_OS_FAMILY_aix |
781 # include "os_aix.hpp" | |
782 # include "os_posix.hpp" | |
783 #endif | |
3960 | 784 #ifdef TARGET_OS_FAMILY_bsd |
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785 # include "os_posix.hpp" |
3960 | 786 # include "os_bsd.hpp" |
787 #endif | |
1972 | 788 #ifdef TARGET_OS_ARCH_linux_x86 |
789 # include "os_linux_x86.hpp" | |
790 #endif | |
791 #ifdef TARGET_OS_ARCH_linux_sparc | |
792 # include "os_linux_sparc.hpp" | |
793 #endif | |
794 #ifdef TARGET_OS_ARCH_linux_zero | |
795 # include "os_linux_zero.hpp" | |
796 #endif | |
797 #ifdef TARGET_OS_ARCH_solaris_x86 | |
798 # include "os_solaris_x86.hpp" | |
799 #endif | |
800 #ifdef TARGET_OS_ARCH_solaris_sparc | |
801 # include "os_solaris_sparc.hpp" | |
802 #endif | |
803 #ifdef TARGET_OS_ARCH_windows_x86 | |
804 # include "os_windows_x86.hpp" | |
805 #endif | |
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806 #ifdef TARGET_OS_ARCH_linux_arm |
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807 # include "os_linux_arm.hpp" |
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808 #endif |
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809 #ifdef TARGET_OS_ARCH_linux_ppc |
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810 # include "os_linux_ppc.hpp" |
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811 #endif |
14411 | 812 #ifdef TARGET_OS_ARCH_aix_ppc |
813 # include "os_aix_ppc.hpp" | |
814 #endif | |
3960 | 815 #ifdef TARGET_OS_ARCH_bsd_x86 |
816 # include "os_bsd_x86.hpp" | |
817 #endif | |
818 #ifdef TARGET_OS_ARCH_bsd_zero | |
819 # include "os_bsd_zero.hpp" | |
820 #endif | |
1972 | 821 |
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822 #ifndef OS_NATIVE_THREAD_CREATION_FAILED_MSG |
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823 #define OS_NATIVE_THREAD_CREATION_FAILED_MSG "unable to create native thread: possibly out of memory or process/resource limits reached" |
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824 #endif |
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825 |
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826 public: |
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827 #ifndef PLATFORM_PRINT_NATIVE_STACK |
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828 // No platform-specific code for printing the native stack. |
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829 static bool platform_print_native_stack(outputStream* st, void* context, |
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830 char *buf, int buf_size) { |
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831 return false; |
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832 } |
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833 #endif |
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834 |
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835 // debugging support (mostly used by debug.cpp but also fatal error handler) |
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836 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address |
0 | 837 |
838 static bool dont_yield(); // when true, JVM_Yield() is nop | |
839 static void print_statistics(); | |
840 | |
841 // Thread priority helpers (implemented in OS-specific part) | |
842 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
843 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
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844 static int java_to_os_priority[CriticalPriority + 1]; |
0 | 845 // Hint to the underlying OS that a task switch would not be good. |
846 // Void return because it's a hint and can fail. | |
847 static void hint_no_preempt(); | |
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848 static const char* native_thread_creation_failed_msg() { |
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849 return OS_NATIVE_THREAD_CREATION_FAILED_MSG; |
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850 } |
0 | 851 |
852 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
853 // Causes the VM to wait until an external stimulus has been applied | |
854 // (for Unix, that stimulus is a signal, for Windows, an external | |
855 // ResumeThread call) | |
856 static void pause(); | |
857 | |
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858 // Builds a platform dependent Agent_OnLoad_<libname> function name |
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859 // which is used to find statically linked in agents. |
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860 static char* build_agent_function_name(const char *sym, const char *cname, |
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861 bool is_absolute_path); |
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862 |
10405 | 863 class SuspendedThreadTaskContext { |
864 public: | |
865 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} | |
866 Thread* thread() const { return _thread; } | |
867 void* ucontext() const { return _ucontext; } | |
868 private: | |
869 Thread* _thread; | |
870 void* _ucontext; | |
871 }; | |
872 | |
873 class SuspendedThreadTask { | |
874 public: | |
875 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} | |
876 virtual ~SuspendedThreadTask() {} | |
877 void run(); | |
878 bool is_done() { return _done; } | |
879 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; | |
880 protected: | |
881 private: | |
882 void internal_do_task(); | |
883 Thread* _thread; | |
884 bool _done; | |
885 }; | |
886 | |
887 #ifndef TARGET_OS_FAMILY_windows | |
888 // Suspend/resume support | |
889 // Protocol: | |
890 // | |
891 // a thread starts in SR_RUNNING | |
892 // | |
893 // SR_RUNNING can go to | |
894 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it | |
895 // SR_SUSPEND_REQUEST can go to | |
896 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) | |
897 // * SR_SUSPENDED if the stopped thread receives the signal and switches state | |
898 // SR_SUSPENDED can go to | |
899 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume | |
900 // SR_WAKEUP_REQUEST can go to | |
901 // * SR_RUNNING when the stopped thread receives the signal | |
902 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) | |
903 class SuspendResume { | |
904 public: | |
905 enum State { | |
906 SR_RUNNING, | |
907 SR_SUSPEND_REQUEST, | |
908 SR_SUSPENDED, | |
909 SR_WAKEUP_REQUEST | |
910 }; | |
911 | |
912 private: | |
913 volatile State _state; | |
914 | |
915 private: | |
916 /* try to switch state from state "from" to state "to" | |
917 * returns the state set after the method is complete | |
918 */ | |
919 State switch_state(State from, State to); | |
920 | |
921 public: | |
922 SuspendResume() : _state(SR_RUNNING) { } | |
923 | |
924 State state() const { return _state; } | |
925 | |
926 State request_suspend() { | |
927 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); | |
928 } | |
929 | |
930 State cancel_suspend() { | |
931 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); | |
932 } | |
933 | |
934 State suspended() { | |
935 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); | |
936 } | |
937 | |
938 State request_wakeup() { | |
939 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); | |
940 } | |
941 | |
942 State running() { | |
943 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); | |
944 } | |
945 | |
946 bool is_running() const { | |
947 return _state == SR_RUNNING; | |
948 } | |
949 | |
950 bool is_suspend_request() const { | |
951 return _state == SR_SUSPEND_REQUEST; | |
952 } | |
953 | |
954 bool is_suspended() const { | |
955 return _state == SR_SUSPENDED; | |
956 } | |
957 }; | |
958 #endif | |
959 | |
960 | |
0 | 961 protected: |
962 static long _rand_seed; // seed for random number generator | |
963 static int _processor_count; // number of processors | |
964 | |
965 static char* format_boot_path(const char* format_string, | |
966 const char* home, | |
967 int home_len, | |
968 char fileSep, | |
969 char pathSep); | |
970 static bool set_boot_path(char fileSep, char pathSep); | |
691 | 971 static char** split_path(const char* path, int* n); |
11151 | 972 |
0 | 973 }; |
974 | |
975 // Note that "PAUSE" is almost always used with synchronization | |
976 // so arguably we should provide Atomic::SpinPause() instead | |
977 // of the global SpinPause() with C linkage. | |
978 // It'd also be eligible for inlining on many platforms. | |
979 | |
11127 | 980 extern "C" int SpinPause(); |
1972 | 981 |
982 #endif // SHARE_VM_RUNTIME_OS_HPP |