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