Sat, 09 Nov 2019 20:29:45 +0800
Merge
1 /*
2 * Copyright (c) 1997, 2019, 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 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_RUNTIME_OS_HPP
32 #define SHARE_VM_RUNTIME_OS_HPP
34 #include "jvmtifiles/jvmti.h"
35 #include "runtime/atomic.hpp"
36 #include "runtime/extendedPC.hpp"
37 #include "runtime/handles.hpp"
38 #include "utilities/top.hpp"
39 #ifdef TARGET_OS_FAMILY_linux
40 # include "jvm_linux.h"
41 # include <setjmp.h>
42 #endif
43 #ifdef TARGET_OS_FAMILY_solaris
44 # include "jvm_solaris.h"
45 # include <setjmp.h>
46 #endif
47 #ifdef TARGET_OS_FAMILY_windows
48 # include "jvm_windows.h"
49 #endif
50 #ifdef TARGET_OS_FAMILY_aix
51 # include "jvm_aix.h"
52 # include <setjmp.h>
53 #endif
54 #ifdef TARGET_OS_FAMILY_bsd
55 # include "jvm_bsd.h"
56 # include <setjmp.h>
57 # ifdef __APPLE__
58 # include <mach/mach_time.h>
59 # endif
60 #endif
62 class AgentLibrary;
64 // os defines the interface to operating system; this includes traditional
65 // OS services (time, I/O) as well as other functionality with system-
66 // dependent code.
68 typedef void (*dll_func)(...);
70 class Thread;
71 class JavaThread;
72 class Event;
73 class DLL;
74 class FileHandle;
75 class NativeCallStack;
77 template<class E> class GrowableArray;
79 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
81 // Platform-independent error return values from OS functions
82 enum OSReturn {
83 OS_OK = 0, // Operation was successful
84 OS_ERR = -1, // Operation failed
85 OS_INTRPT = -2, // Operation was interrupted
86 OS_TIMEOUT = -3, // Operation timed out
87 OS_NOMEM = -5, // Operation failed for lack of memory
88 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
89 };
91 enum ThreadPriority { // JLS 20.20.1-3
92 NoPriority = -1, // Initial non-priority value
93 MinPriority = 1, // Minimum priority
94 NormPriority = 5, // Normal (non-daemon) priority
95 NearMaxPriority = 9, // High priority, used for VMThread
96 MaxPriority = 10, // Highest priority, used for WatcherThread
97 // ensures that VMThread doesn't starve profiler
98 CriticalPriority = 11 // Critical thread priority
99 };
101 // Executable parameter flag for os::commit_memory() and
102 // os::commit_memory_or_exit().
103 const bool ExecMem = true;
105 // Typedef for structured exception handling support
106 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
108 class MallocTracker;
110 class os: AllStatic {
111 friend class VMStructs;
112 friend class MallocTracker;
113 public:
114 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
116 private:
117 static OSThread* _starting_thread;
118 static address _polling_page;
119 static volatile int32_t * _mem_serialize_page;
120 static uintptr_t _serialize_page_mask;
121 public:
122 static size_t _page_sizes[page_sizes_max];
124 private:
125 static void init_page_sizes(size_t default_page_size) {
126 _page_sizes[0] = default_page_size;
127 _page_sizes[1] = 0; // sentinel
128 }
130 static char* pd_reserve_memory(size_t bytes, char* addr = 0,
131 size_t alignment_hint = 0);
132 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr);
133 static void pd_split_reserved_memory(char *base, size_t size,
134 size_t split, bool realloc);
135 static bool pd_commit_memory(char* addr, size_t bytes, bool executable);
136 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
137 bool executable);
138 // Same as pd_commit_memory() that either succeeds or calls
139 // vm_exit_out_of_memory() with the specified mesg.
140 static void pd_commit_memory_or_exit(char* addr, size_t bytes,
141 bool executable, const char* mesg);
142 static void pd_commit_memory_or_exit(char* addr, size_t size,
143 size_t alignment_hint,
144 bool executable, const char* mesg);
145 static bool pd_uncommit_memory(char* addr, size_t bytes);
146 static bool pd_release_memory(char* addr, size_t bytes);
148 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset,
149 char *addr, size_t bytes, bool read_only = false,
150 bool allow_exec = false);
151 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset,
152 char *addr, size_t bytes, bool read_only,
153 bool allow_exec);
154 static bool pd_unmap_memory(char *addr, size_t bytes);
155 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
156 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
158 static size_t page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned);
160 static void initialize_initial_active_processor_count();
162 LINUX_ONLY(static void pd_init_container_support();)
164 public:
165 static void init(void); // Called before command line parsing
167 static void init_container_support() { // Called during command line parsing.
168 LINUX_ONLY(pd_init_container_support();)
169 }
171 static void init_before_ergo(void); // Called after command line parsing
172 // before VM ergonomics processing.
173 static jint init_2(void); // Called after command line parsing
174 // and VM ergonomics processing
175 static void init_globals(void) { // Called from init_globals() in init.cpp
176 init_globals_ext();
177 }
179 // File names are case-insensitive on windows only
180 // Override me as needed
181 static int file_name_strcmp(const char* s1, const char* s2);
183 // get/unset environment variable
184 static bool getenv(const char* name, char* buffer, int len);
185 static bool unsetenv(const char* name);
187 static bool have_special_privileges();
189 static jlong javaTimeMillis();
190 static jlong javaTimeNanos();
191 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
192 static void run_periodic_checks();
195 // Returns the elapsed time in seconds since the vm started.
196 static double elapsedTime();
198 // Returns real time in seconds since an arbitrary point
199 // in the past.
200 static bool getTimesSecs(double* process_real_time,
201 double* process_user_time,
202 double* process_system_time);
204 // Interface to the performance counter
205 static jlong elapsed_counter();
206 static jlong elapsed_frequency();
208 // The "virtual time" of a thread is the amount of time a thread has
209 // actually run. The first function indicates whether the OS supports
210 // this functionality for the current thread, and if so:
211 // * the second enables vtime tracking (if that is required).
212 // * the third tells whether vtime is enabled.
213 // * the fourth returns the elapsed virtual time for the current
214 // thread.
215 static bool supports_vtime();
216 static bool enable_vtime();
217 static bool vtime_enabled();
218 static double elapsedVTime();
220 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
221 // It is MT safe, but not async-safe, as reading time zone
222 // information may require a lock on some platforms.
223 static char* local_time_string(char *buf, size_t buflen);
224 static struct tm* localtime_pd (const time_t* clock, struct tm* res);
225 // Fill in buffer with current local time as an ISO-8601 string.
226 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
227 // Returns buffer, or NULL if it failed.
228 static char* iso8601_time(char* buffer, size_t buffer_length);
230 // Interface for detecting multiprocessor system
231 static inline bool is_MP() {
232 // During bootstrap if _processor_count is not yet initialized
233 // we claim to be MP as that is safest. If any platform has a
234 // stub generator that might be triggered in this phase and for
235 // which being declared MP when in fact not, is a problem - then
236 // the bootstrap routine for the stub generator needs to check
237 // the processor count directly and leave the bootstrap routine
238 // in place until called after initialization has ocurred.
239 return (_processor_count != 1) || AssumeMP;
240 }
241 static julong available_memory();
242 static julong physical_memory();
243 static bool has_allocatable_memory_limit(julong* limit);
244 static bool is_server_class_machine();
246 // number of CPUs
247 static int processor_count() {
248 return _processor_count;
249 }
250 static void set_processor_count(int count) { _processor_count = count; }
252 // Returns the number of CPUs this process is currently allowed to run on.
253 // Note that on some OSes this can change dynamically.
254 static int active_processor_count();
256 // At startup the number of active CPUs this process is allowed to run on.
257 // This value does not change dynamically. May be different from active_processor_count().
258 static int initial_active_processor_count() {
259 assert(_initial_active_processor_count > 0, "Initial active processor count not set yet.");
260 return _initial_active_processor_count;
261 }
263 // Bind processes to processors.
264 // This is a two step procedure:
265 // first you generate a distribution of processes to processors,
266 // then you bind processes according to that distribution.
267 // Compute a distribution for number of processes to processors.
268 // Stores the processor id's into the distribution array argument.
269 // Returns true if it worked, false if it didn't.
270 static bool distribute_processes(uint length, uint* distribution);
271 // Binds the current process to a processor.
272 // Returns true if it worked, false if it didn't.
273 static bool bind_to_processor(uint processor_id);
275 // Give a name to the current thread.
276 static void set_native_thread_name(const char *name);
278 // Interface for stack banging (predetect possible stack overflow for
279 // exception processing) There are guard pages, and above that shadow
280 // pages for stack overflow checking.
281 static bool uses_stack_guard_pages();
282 static bool allocate_stack_guard_pages();
283 static void bang_stack_shadow_pages();
284 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
286 // OS interface to Virtual Memory
288 // Return the default page size.
289 static int vm_page_size();
291 // Returns the page size to use for a region of memory.
292 // region_size / min_pages will always be greater than or equal to the
293 // returned value. The returned value will divide region_size.
294 static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages);
296 // Returns the page size to use for a region of memory.
297 // region_size / min_pages will always be greater than or equal to the
298 // returned value. The returned value might not divide region_size.
299 static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages);
301 // Return the largest page size that can be used
302 static size_t max_page_size() {
303 // The _page_sizes array is sorted in descending order.
304 return _page_sizes[0];
305 }
307 // Methods for tracing page sizes returned by the above method; enabled by
308 // TracePageSizes. The region_{min,max}_size parameters should be the values
309 // passed to page_size_for_region() and page_size should be the result of that
310 // call. The (optional) base and size parameters should come from the
311 // ReservedSpace base() and size() methods.
312 static void trace_page_sizes(const char* str, const size_t* page_sizes,
313 int count) PRODUCT_RETURN;
314 static void trace_page_sizes(const char* str, const size_t region_min_size,
315 const size_t region_max_size,
316 const size_t page_size,
317 const char* base = NULL,
318 const size_t size = 0) PRODUCT_RETURN;
320 static int vm_allocation_granularity();
321 static char* reserve_memory(size_t bytes, char* addr = 0,
322 size_t alignment_hint = 0);
323 static char* reserve_memory(size_t bytes, char* addr,
324 size_t alignment_hint, MEMFLAGS flags);
325 static char* reserve_memory_aligned(size_t size, size_t alignment);
326 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
327 static void split_reserved_memory(char *base, size_t size,
328 size_t split, bool realloc);
329 static bool commit_memory(char* addr, size_t bytes, bool executable);
330 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
331 bool executable);
332 // Same as commit_memory() that either succeeds or calls
333 // vm_exit_out_of_memory() with the specified mesg.
334 static void commit_memory_or_exit(char* addr, size_t bytes,
335 bool executable, const char* mesg);
336 static void commit_memory_or_exit(char* addr, size_t size,
337 size_t alignment_hint,
338 bool executable, const char* mesg);
339 static bool uncommit_memory(char* addr, size_t bytes);
340 static bool release_memory(char* addr, size_t bytes);
342 // Touch memory pages that cover the memory range from start to end (exclusive)
343 // to make the OS back the memory range with actual memory.
344 // Current implementation may not touch the last page if unaligned addresses
345 // are passed.
346 static void pretouch_memory(char* start, char* end);
348 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
349 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
350 bool is_committed = true);
352 static bool guard_memory(char* addr, size_t bytes);
353 static bool unguard_memory(char* addr, size_t bytes);
354 static bool create_stack_guard_pages(char* addr, size_t bytes);
355 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
356 static bool remove_stack_guard_pages(char* addr, size_t bytes);
358 static char* map_memory(int fd, const char* file_name, size_t file_offset,
359 char *addr, size_t bytes, bool read_only = false,
360 bool allow_exec = false);
361 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
362 char *addr, size_t bytes, bool read_only,
363 bool allow_exec);
364 static bool unmap_memory(char *addr, size_t bytes);
365 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
366 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
368 // NUMA-specific interface
369 static bool numa_has_static_binding();
370 static bool numa_has_group_homing();
371 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
372 static void numa_make_global(char *addr, size_t bytes);
373 static size_t numa_get_groups_num();
374 static size_t numa_get_leaf_groups(int *ids, size_t size);
375 static bool numa_topology_changed();
376 static int numa_get_group_id();
378 // Page manipulation
379 struct page_info {
380 size_t size;
381 int lgrp_id;
382 };
383 static bool get_page_info(char *start, page_info* info);
384 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
386 static char* non_memory_address_word();
387 // reserve, commit and pin the entire memory region
388 static char* reserve_memory_special(size_t size, size_t alignment,
389 char* addr, bool executable);
390 static bool release_memory_special(char* addr, size_t bytes);
391 static void large_page_init();
392 static size_t large_page_size();
393 static bool can_commit_large_page_memory();
394 static bool can_execute_large_page_memory();
396 // OS interface to polling page
397 static address get_polling_page() { return _polling_page; }
398 static void set_polling_page(address page) { _polling_page = page; }
399 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
400 static void make_polling_page_unreadable();
401 static void make_polling_page_readable();
403 // Routines used to serialize the thread state without using membars
404 static void serialize_thread_states();
406 // Since we write to the serialize page from every thread, we
407 // want stores to be on unique cache lines whenever possible
408 // in order to minimize CPU cross talk. We pre-compute the
409 // amount to shift the thread* to make this offset unique to
410 // each thread.
411 static int get_serialize_page_shift_count() {
412 return SerializePageShiftCount;
413 }
415 static void set_serialize_page_mask(uintptr_t mask) {
416 _serialize_page_mask = mask;
417 }
419 static unsigned int get_serialize_page_mask() {
420 return _serialize_page_mask;
421 }
423 static void set_memory_serialize_page(address page);
425 static address get_memory_serialize_page() {
426 return (address)_mem_serialize_page;
427 }
429 static inline void write_memory_serialize_page(JavaThread *thread) {
430 uintptr_t page_offset = ((uintptr_t)thread >>
431 get_serialize_page_shift_count()) &
432 get_serialize_page_mask();
433 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
434 }
436 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
437 if (UseMembar) return false;
438 // Previously this function calculated the exact address of this
439 // thread's serialize page, and checked if the faulting address
440 // was equal. However, some platforms mask off faulting addresses
441 // to the page size, so now we just check that the address is
442 // within the page. This makes the thread argument unnecessary,
443 // but we retain the NULL check to preserve existing behaviour.
444 if (thread == NULL) return false;
445 address page = (address) _mem_serialize_page;
446 return addr >= page && addr < (page + os::vm_page_size());
447 }
449 static void block_on_serialize_page_trap();
451 // threads
453 enum ThreadType {
454 vm_thread,
455 cgc_thread, // Concurrent GC thread
456 pgc_thread, // Parallel GC thread
457 java_thread,
458 compiler_thread,
459 watcher_thread,
460 os_thread
461 };
463 static bool create_thread(Thread* thread,
464 ThreadType thr_type,
465 size_t stack_size = 0);
467 // The "main thread", also known as "starting thread", is the thread
468 // that loads/creates the JVM via JNI_CreateJavaVM.
469 static bool create_main_thread(JavaThread* thread);
471 // The primordial thread is the initial process thread. The java
472 // launcher never uses the primordial thread as the main thread, but
473 // applications that host the JVM directly may do so. Some platforms
474 // need special-case handling of the primordial thread if it attaches
475 // to the VM.
476 static bool is_primordial_thread(void)
477 #if defined(_WINDOWS) || defined(BSD)
478 // No way to identify the primordial thread.
479 { return false; }
480 #else
481 ;
482 #endif
484 static bool create_attached_thread(JavaThread* thread);
485 static void pd_start_thread(Thread* thread);
486 static void start_thread(Thread* thread);
488 static void initialize_thread(Thread* thr);
489 static void free_thread(OSThread* osthread);
491 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
492 static intx current_thread_id();
493 static int current_process_id();
494 static int sleep(Thread* thread, jlong ms, bool interruptable);
495 // Short standalone OS sleep suitable for slow path spin loop.
496 // Ignores Thread.interrupt() (so keep it short).
497 // ms = 0, will sleep for the least amount of time allowed by the OS.
498 static void naked_short_sleep(jlong ms);
499 static void infinite_sleep(); // never returns, use with CAUTION
500 static void yield(); // Yields to all threads with same priority
501 enum YieldResult {
502 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
503 YIELD_NONEREADY = 0, // No other runnable/ready threads.
504 // platform-specific yield return immediately
505 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
506 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
507 // yield that can be used in lieu of blocking.
508 } ;
509 static YieldResult NakedYield () ;
510 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
511 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
512 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
513 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
515 static void interrupt(Thread* thread);
516 static bool is_interrupted(Thread* thread, bool clear_interrupted);
518 static int pd_self_suspend_thread(Thread* thread);
520 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
521 static frame fetch_frame_from_context(void* ucVoid);
523 static ExtendedPC get_thread_pc(Thread *thread);
524 static void breakpoint();
526 static address current_stack_pointer();
527 static address current_stack_base();
528 static size_t current_stack_size();
530 static void verify_stack_alignment() PRODUCT_RETURN;
532 static int message_box(const char* title, const char* message);
533 static char* do_you_want_to_debug(const char* message);
535 // run cmd in a separate process and return its exit code; or -1 on failures
536 static int fork_and_exec(char *cmd, bool use_vfork_if_available = false);
538 // os::exit() is merged with vm_exit()
539 // static void exit(int num);
541 // Terminate the VM, but don't exit the process
542 static void shutdown();
544 // Terminate with an error. Default is to generate a core file on platforms
545 // that support such things. This calls shutdown() and then aborts.
546 static void abort(bool dump_core = true);
548 // Die immediately, no exit hook, no abort hook, no cleanup.
549 static void die();
551 // File i/o operations
552 static const int default_file_open_flags();
553 static int open(const char *path, int oflag, int mode);
554 static FILE* open(int fd, const char* mode);
555 static int close(int fd);
556 static jlong lseek(int fd, jlong offset, int whence);
557 static char* native_path(char *path);
558 static int ftruncate(int fd, jlong length);
559 static int fsync(int fd);
560 static int available(int fd, jlong *bytes);
562 //File i/o operations
564 static size_t read(int fd, void *buf, unsigned int nBytes);
565 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
566 static size_t write(int fd, const void *buf, unsigned int nBytes);
568 // Reading directories.
569 static DIR* opendir(const char* dirname);
570 static struct dirent* readdir(DIR* dirp);
571 static int closedir(DIR* dirp);
573 // Dynamic library extension
574 static const char* dll_file_extension();
576 static const char* get_temp_directory();
577 static const char* get_current_directory(char *buf, size_t buflen);
579 // Builds a platform-specific full library path given a ld path and lib name
580 // Returns true if buffer contains full path to existing file, false otherwise
581 static bool dll_build_name(char* buffer, size_t size,
582 const char* pathname, const char* fname);
584 // Symbol lookup, find nearest function name; basically it implements
585 // dladdr() for all platforms. Name of the nearest function is copied
586 // to buf. Distance from its base address is optionally returned as offset.
587 // If function name is not found, buf[0] is set to '\0' and offset is
588 // set to -1 (if offset is non-NULL).
589 static bool dll_address_to_function_name(address addr, char* buf,
590 int buflen, int* offset);
592 // Locate DLL/DSO. On success, full path of the library is copied to
593 // buf, and offset is optionally set to be the distance between addr
594 // and the library's base address. On failure, buf[0] is set to '\0'
595 // and offset is set to -1 (if offset is non-NULL).
596 static bool dll_address_to_library_name(address addr, char* buf,
597 int buflen, int* offset);
599 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
600 static bool address_is_in_vm(address addr);
602 // Loads .dll/.so and
603 // in case of error it checks if .dll/.so was built for the
604 // same architecture as Hotspot is running on
605 static void* dll_load(const char *name, char *ebuf, int ebuflen);
607 // lookup symbol in a shared library
608 static void* dll_lookup(void* handle, const char* name);
610 // Unload library
611 static void dll_unload(void *lib);
613 // Return the handle of this process
614 static void* get_default_process_handle();
616 // Check for static linked agent library
617 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
618 size_t syms_len);
620 // Find agent entry point
621 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
622 const char *syms[], size_t syms_len);
624 static int vsnprintf(char* buf, size_t len, const char* fmt, va_list args) ATTRIBUTE_PRINTF(3, 0);
625 static int snprintf(char* buf, size_t len, const char* fmt, ...) ATTRIBUTE_PRINTF(3, 4);
627 // Print out system information; they are called by fatal error handler.
628 // Output format may be different on different platforms.
629 static void print_os_info(outputStream* st);
630 static void print_os_info_brief(outputStream* st);
631 static void print_cpu_info(outputStream* st);
632 static void pd_print_cpu_info(outputStream* st);
633 static void print_memory_info(outputStream* st);
634 static void print_dll_info(outputStream* st);
635 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
636 static void print_context(outputStream* st, void* context);
637 static void print_register_info(outputStream* st, void* context);
638 static void print_siginfo(outputStream* st, void* siginfo);
639 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
640 static void print_date_and_time(outputStream* st, char* buf, size_t buflen);
642 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
643 static size_t lasterror(char *buf, size_t len);
644 static int get_last_error();
646 // Determines whether the calling process is being debugged by a user-mode debugger.
647 static bool is_debugger_attached();
649 // wait for a key press if PauseAtExit is set
650 static void wait_for_keypress_at_exit(void);
652 // The following two functions are used by fatal error handler to trace
653 // native (C) frames. They are not part of frame.hpp/frame.cpp because
654 // frame.hpp/cpp assume thread is JavaThread, and also because different
655 // OS/compiler may have different convention or provide different API to
656 // walk C frames.
657 //
658 // We don't attempt to become a debugger, so we only follow frames if that
659 // does not require a lookup in the unwind table, which is part of the binary
660 // file but may be unsafe to read after a fatal error. So on x86, we can
661 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
662 // possible to walk C stack without having the unwind table.
663 static bool is_first_C_frame(frame *fr);
664 static frame get_sender_for_C_frame(frame *fr);
666 // return current frame. pc() and sp() are set to NULL on failure.
667 static frame current_frame();
669 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
671 // returns a string to describe the exception/signal;
672 // returns NULL if exception_code is not an OS exception/signal.
673 static const char* exception_name(int exception_code, char* buf, size_t buflen);
675 // Returns native Java library, loads if necessary
676 static void* native_java_library();
678 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
679 static void jvm_path(char *buf, jint buflen);
681 // Returns true if we are running in a headless jre.
682 static bool is_headless_jre();
684 // JNI names
685 static void print_jni_name_prefix_on(outputStream* st, int args_size);
686 static void print_jni_name_suffix_on(outputStream* st, int args_size);
688 // File conventions
689 static const char* file_separator();
690 static const char* line_separator();
691 static const char* path_separator();
693 // Init os specific system properties values
694 static void init_system_properties_values();
696 // IO operations, non-JVM_ version.
697 static int stat(const char* path, struct stat* sbuf);
698 static bool dir_is_empty(const char* path);
700 // IO operations on binary files
701 static int create_binary_file(const char* path, bool rewrite_existing);
702 static jlong current_file_offset(int fd);
703 static jlong seek_to_file_offset(int fd, jlong offset);
705 // Thread Local Storage
706 static int allocate_thread_local_storage();
707 static void thread_local_storage_at_put(int index, void* value);
708 static void* thread_local_storage_at(int index);
709 static void free_thread_local_storage(int index);
711 // Retrieve native stack frames.
712 // Parameter:
713 // stack: an array to storage stack pointers.
714 // frames: size of above array.
715 // toSkip: number of stack frames to skip at the beginning.
716 // Return: number of stack frames captured.
717 static int get_native_stack(address* stack, int size, int toSkip = 0);
719 // General allocation (must be MT-safe)
720 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack);
721 static void* malloc (size_t size, MEMFLAGS flags);
722 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack);
723 static void* realloc (void *memblock, size_t size, MEMFLAGS flag);
725 static void free (void *memblock, MEMFLAGS flags = mtNone);
726 static bool check_heap(bool force = false); // verify C heap integrity
727 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
729 #ifndef PRODUCT
730 static julong num_mallocs; // # of calls to malloc/realloc
731 static julong alloc_bytes; // # of bytes allocated
732 static julong num_frees; // # of calls to free
733 static julong free_bytes; // # of bytes freed
734 #endif
736 // SocketInterface (ex HPI SocketInterface )
737 static int socket(int domain, int type, int protocol);
738 static int socket_close(int fd);
739 static int socket_shutdown(int fd, int howto);
740 static int recv(int fd, char* buf, size_t nBytes, uint flags);
741 static int send(int fd, char* buf, size_t nBytes, uint flags);
742 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
743 static int timeout(int fd, long timeout);
744 static int listen(int fd, int count);
745 static int connect(int fd, struct sockaddr* him, socklen_t len);
746 static int bind(int fd, struct sockaddr* him, socklen_t len);
747 static int accept(int fd, struct sockaddr* him, socklen_t* len);
748 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
749 struct sockaddr* from, socklen_t* fromlen);
750 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
751 static int sendto(int fd, char* buf, size_t len, uint flags,
752 struct sockaddr* to, socklen_t tolen);
753 static int socket_available(int fd, jint* pbytes);
755 static int get_sock_opt(int fd, int level, int optname,
756 char* optval, socklen_t* optlen);
757 static int set_sock_opt(int fd, int level, int optname,
758 const char* optval, socklen_t optlen);
759 static int get_host_name(char* name, int namelen);
761 static struct hostent* get_host_by_name(char* name);
763 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
764 static void signal_init();
765 static void signal_init_pd();
766 static void signal_notify(int signal_number);
767 static void* signal(int signal_number, void* handler);
768 static void signal_raise(int signal_number);
769 static int signal_wait();
770 static int signal_lookup();
771 static void* user_handler();
772 static void terminate_signal_thread();
773 static int sigexitnum_pd();
775 // random number generation
776 static long random(); // return 32bit pseudorandom number
777 static void init_random(long initval); // initialize random sequence
779 // Structured OS Exception support
780 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
782 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
783 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
785 // Get the default path to the core file
786 // Returns the length of the string
787 static int get_core_path(char* buffer, size_t bufferSize);
789 // JVMTI & JVM monitoring and management support
790 // The thread_cpu_time() and current_thread_cpu_time() are only
791 // supported if is_thread_cpu_time_supported() returns true.
792 // They are not supported on Solaris T1.
794 // Thread CPU Time - return the fast estimate on a platform
795 // On Solaris - call gethrvtime (fast) - user time only
796 // On Linux - fast clock_gettime where available - user+sys
797 // - otherwise: very slow /proc fs - user+sys
798 // On Windows - GetThreadTimes - user+sys
799 static jlong current_thread_cpu_time();
800 static jlong thread_cpu_time(Thread* t);
802 // Thread CPU Time with user_sys_cpu_time parameter.
803 //
804 // If user_sys_cpu_time is true, user+sys time is returned.
805 // Otherwise, only user time is returned
806 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
807 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
809 // Return a bunch of info about the timers.
810 // Note that the returned info for these two functions may be different
811 // on some platforms
812 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
813 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
815 static bool is_thread_cpu_time_supported();
817 // System loadavg support. Returns -1 if load average cannot be obtained.
818 static int loadavg(double loadavg[], int nelem);
820 // Hook for os specific jvm options that we don't want to abort on seeing
821 static bool obsolete_option(const JavaVMOption *option);
823 // Extensions
824 #include "runtime/os_ext.hpp"
826 public:
827 class CrashProtectionCallback : public StackObj {
828 public:
829 virtual void call() = 0;
830 };
832 // Platform dependent stuff
833 #ifdef TARGET_OS_FAMILY_linux
834 # include "os_linux.hpp"
835 # include "os_posix.hpp"
836 #endif
837 #ifdef TARGET_OS_FAMILY_solaris
838 # include "os_solaris.hpp"
839 # include "os_posix.hpp"
840 #endif
841 #ifdef TARGET_OS_FAMILY_windows
842 # include "os_windows.hpp"
843 #endif
844 #ifdef TARGET_OS_FAMILY_aix
845 # include "os_aix.hpp"
846 # include "os_posix.hpp"
847 #endif
848 #ifdef TARGET_OS_FAMILY_bsd
849 # include "os_posix.hpp"
850 # include "os_bsd.hpp"
851 #endif
852 #ifdef TARGET_OS_ARCH_linux_x86
853 # include "os_linux_x86.hpp"
854 #endif
855 #ifdef TARGET_OS_ARCH_linux_mips
856 # include "os_linux_mips.hpp"
857 #endif
858 #ifdef TARGET_OS_ARCH_linux_sparc
859 # include "os_linux_sparc.hpp"
860 #endif
861 #ifdef TARGET_OS_ARCH_linux_zero
862 # include "os_linux_zero.hpp"
863 #endif
864 #ifdef TARGET_OS_ARCH_solaris_x86
865 # include "os_solaris_x86.hpp"
866 #endif
867 #ifdef TARGET_OS_ARCH_solaris_sparc
868 # include "os_solaris_sparc.hpp"
869 #endif
870 #ifdef TARGET_OS_ARCH_windows_x86
871 # include "os_windows_x86.hpp"
872 #endif
873 #ifdef TARGET_OS_ARCH_linux_arm
874 # include "os_linux_arm.hpp"
875 #endif
876 #ifdef TARGET_OS_ARCH_linux_ppc
877 # include "os_linux_ppc.hpp"
878 #endif
879 #ifdef TARGET_OS_ARCH_aix_ppc
880 # include "os_aix_ppc.hpp"
881 #endif
882 #ifdef TARGET_OS_ARCH_bsd_x86
883 # include "os_bsd_x86.hpp"
884 #endif
885 #ifdef TARGET_OS_ARCH_bsd_zero
886 # include "os_bsd_zero.hpp"
887 #endif
889 public:
890 #ifndef PLATFORM_PRINT_NATIVE_STACK
891 // No platform-specific code for printing the native stack.
892 static bool platform_print_native_stack(outputStream* st, void* context,
893 char *buf, int buf_size) {
894 return false;
895 }
896 #endif
898 // debugging support (mostly used by debug.cpp but also fatal error handler)
899 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
901 static bool dont_yield(); // when true, JVM_Yield() is nop
902 static void print_statistics();
904 // Thread priority helpers (implemented in OS-specific part)
905 static OSReturn set_native_priority(Thread* thread, int native_prio);
906 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
907 static int java_to_os_priority[CriticalPriority + 1];
908 // Hint to the underlying OS that a task switch would not be good.
909 // Void return because it's a hint and can fail.
910 static void hint_no_preempt();
912 // Used at creation if requested by the diagnostic flag PauseAtStartup.
913 // Causes the VM to wait until an external stimulus has been applied
914 // (for Unix, that stimulus is a signal, for Windows, an external
915 // ResumeThread call)
916 static void pause();
918 // Builds a platform dependent Agent_OnLoad_<libname> function name
919 // which is used to find statically linked in agents.
920 static char* build_agent_function_name(const char *sym, const char *cname,
921 bool is_absolute_path);
923 class SuspendedThreadTaskContext {
924 public:
925 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
926 Thread* thread() const { return _thread; }
927 void* ucontext() const { return _ucontext; }
928 private:
929 Thread* _thread;
930 void* _ucontext;
931 };
933 class SuspendedThreadTask {
934 public:
935 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
936 virtual ~SuspendedThreadTask() {}
937 void run();
938 bool is_done() { return _done; }
939 virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
940 protected:
941 private:
942 void internal_do_task();
943 Thread* _thread;
944 bool _done;
945 };
947 #ifndef TARGET_OS_FAMILY_windows
948 // Suspend/resume support
949 // Protocol:
950 //
951 // a thread starts in SR_RUNNING
952 //
953 // SR_RUNNING can go to
954 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
955 // SR_SUSPEND_REQUEST can go to
956 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
957 // * SR_SUSPENDED if the stopped thread receives the signal and switches state
958 // SR_SUSPENDED can go to
959 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
960 // SR_WAKEUP_REQUEST can go to
961 // * SR_RUNNING when the stopped thread receives the signal
962 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
963 class SuspendResume {
964 public:
965 enum State {
966 SR_RUNNING,
967 SR_SUSPEND_REQUEST,
968 SR_SUSPENDED,
969 SR_WAKEUP_REQUEST
970 };
972 private:
973 volatile State _state;
975 private:
976 /* try to switch state from state "from" to state "to"
977 * returns the state set after the method is complete
978 */
979 State switch_state(State from, State to);
981 public:
982 SuspendResume() : _state(SR_RUNNING) { }
984 State state() const { return _state; }
986 State request_suspend() {
987 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
988 }
990 State cancel_suspend() {
991 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
992 }
994 State suspended() {
995 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
996 }
998 State request_wakeup() {
999 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
1000 }
1002 State running() {
1003 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
1004 }
1006 bool is_running() const {
1007 return _state == SR_RUNNING;
1008 }
1010 bool is_suspend_request() const {
1011 return _state == SR_SUSPEND_REQUEST;
1012 }
1014 bool is_suspended() const {
1015 return _state == SR_SUSPENDED;
1016 }
1017 };
1018 #endif
1021 protected:
1022 static long _rand_seed; // seed for random number generator
1023 static int _processor_count; // number of processors
1024 static int _initial_active_processor_count; // number of active processors during initialization.
1026 static char* format_boot_path(const char* format_string,
1027 const char* home,
1028 int home_len,
1029 char fileSep,
1030 char pathSep);
1031 static bool set_boot_path(char fileSep, char pathSep);
1032 static char** split_path(const char* path, int* n);
1034 };
1036 // Note that "PAUSE" is almost always used with synchronization
1037 // so arguably we should provide Atomic::SpinPause() instead
1038 // of the global SpinPause() with C linkage.
1039 // It'd also be eligible for inlining on many platforms.
1041 extern "C" int SpinPause();
1043 #endif // SHARE_VM_RUNTIME_OS_HPP