Fri, 24 Jun 2016 17:12:13 +0800
[Code Reorganization] Removed GC related modifications made by Loongson, for example, UseOldNUMA.
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 */
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 template<class E> class GrowableArray;
77 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
79 // Platform-independent error return values from OS functions
80 enum OSReturn {
81 OS_OK = 0, // Operation was successful
82 OS_ERR = -1, // Operation failed
83 OS_INTRPT = -2, // Operation was interrupted
84 OS_TIMEOUT = -3, // Operation timed out
85 OS_NOMEM = -5, // Operation failed for lack of memory
86 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
87 };
89 enum ThreadPriority { // JLS 20.20.1-3
90 NoPriority = -1, // Initial non-priority value
91 MinPriority = 1, // Minimum priority
92 NormPriority = 5, // Normal (non-daemon) priority
93 NearMaxPriority = 9, // High priority, used for VMThread
94 MaxPriority = 10, // Highest priority, used for WatcherThread
95 // ensures that VMThread doesn't starve profiler
96 CriticalPriority = 11 // Critical thread priority
97 };
99 // Executable parameter flag for os::commit_memory() and
100 // os::commit_memory_or_exit().
101 const bool ExecMem = true;
103 // Typedef for structured exception handling support
104 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
106 class os: AllStatic {
107 friend class VMStructs;
109 public:
110 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
112 private:
113 static OSThread* _starting_thread;
114 static address _polling_page;
115 static volatile int32_t * _mem_serialize_page;
116 static uintptr_t _serialize_page_mask;
117 public:
118 static size_t _page_sizes[page_sizes_max];
120 private:
121 static void init_page_sizes(size_t default_page_size) {
122 _page_sizes[0] = default_page_size;
123 _page_sizes[1] = 0; // sentinel
124 }
126 static char* pd_reserve_memory(size_t bytes, char* addr = 0,
127 size_t alignment_hint = 0);
128 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr);
129 static void pd_split_reserved_memory(char *base, size_t size,
130 size_t split, bool realloc);
131 static bool pd_commit_memory(char* addr, size_t bytes, bool executable);
132 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
133 bool executable);
134 // Same as pd_commit_memory() that either succeeds or calls
135 // vm_exit_out_of_memory() with the specified mesg.
136 static void pd_commit_memory_or_exit(char* addr, size_t bytes,
137 bool executable, const char* mesg);
138 static void pd_commit_memory_or_exit(char* addr, size_t size,
139 size_t alignment_hint,
140 bool executable, const char* mesg);
141 static bool pd_uncommit_memory(char* addr, size_t bytes);
142 static bool pd_release_memory(char* addr, size_t bytes);
144 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset,
145 char *addr, size_t bytes, bool read_only = false,
146 bool allow_exec = false);
147 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset,
148 char *addr, size_t bytes, bool read_only,
149 bool allow_exec);
150 static bool pd_unmap_memory(char *addr, size_t bytes);
151 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
152 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
155 public:
156 static void init(void); // Called before command line parsing
157 static void init_before_ergo(void); // Called after command line parsing
158 // before VM ergonomics processing.
159 static jint init_2(void); // Called after command line parsing
160 // and VM ergonomics processing
161 static void init_globals(void) { // Called from init_globals() in init.cpp
162 init_globals_ext();
163 }
164 static void init_3(void); // Called at the end of vm init
166 // File names are case-insensitive on windows only
167 // Override me as needed
168 static int file_name_strcmp(const char* s1, const char* s2);
170 static bool getenv(const char* name, char* buffer, int len);
171 static bool have_special_privileges();
173 static jlong javaTimeMillis();
174 static jlong javaTimeNanos();
175 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
176 static void run_periodic_checks();
179 // Returns the elapsed time in seconds since the vm started.
180 static double elapsedTime();
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);
188 // Interface to the performance counter
189 static jlong elapsed_counter();
190 static jlong elapsed_frequency();
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();
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);
214 // Interface for detecting multiprocessor system
215 static inline bool is_MP() {
216 assert(_processor_count > 0, "invalid processor count");
217 return _processor_count > 1 || AssumeMP;
218 }
219 static julong available_memory();
220 static julong physical_memory();
221 static bool has_allocatable_memory_limit(julong* limit);
222 static bool is_server_class_machine();
224 // number of CPUs
225 static int processor_count() {
226 return _processor_count;
227 }
228 static void set_processor_count(int count) { _processor_count = count; }
230 // Returns the number of CPUs this process is currently allowed to run on.
231 // Note that on some OSes this can change dynamically.
232 static int active_processor_count();
234 // Bind processes to processors.
235 // This is a two step procedure:
236 // first you generate a distribution of processes to processors,
237 // then you bind processes according to that distribution.
238 // Compute a distribution for number of processes to processors.
239 // Stores the processor id's into the distribution array argument.
240 // Returns true if it worked, false if it didn't.
241 static bool distribute_processes(uint length, uint* distribution);
242 // Binds the current process to a processor.
243 // Returns true if it worked, false if it didn't.
244 static bool bind_to_processor(uint processor_id);
246 // Give a name to the current thread.
247 static void set_native_thread_name(const char *name);
249 // Interface for stack banging (predetect possible stack overflow for
250 // exception processing) There are guard pages, and above that shadow
251 // pages for stack overflow checking.
252 static bool uses_stack_guard_pages();
253 static bool allocate_stack_guard_pages();
254 static void bang_stack_shadow_pages();
255 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
257 // OS interface to Virtual Memory
259 // Return the default page size.
260 static int vm_page_size();
262 // Return the page size to use for a region of memory. The min_pages argument
263 // is a hint intended to limit fragmentation; it says the returned page size
264 // should be <= region_max_size / min_pages. Because min_pages is a hint,
265 // this routine may return a size larger than region_max_size / min_pages.
266 //
267 // The current implementation ignores min_pages if a larger page size is an
268 // exact multiple of both region_min_size and region_max_size. This allows
269 // larger pages to be used when doing so would not cause fragmentation; in
270 // particular, a single page can be used when region_min_size ==
271 // region_max_size == a supported page size.
272 static size_t page_size_for_region(size_t region_min_size,
273 size_t region_max_size,
274 uint min_pages);
275 // Return the largest page size that can be used
276 static size_t max_page_size() {
277 // The _page_sizes array is sorted in descending order.
278 return _page_sizes[0];
279 }
281 // Methods for tracing page sizes returned by the above method; enabled by
282 // TracePageSizes. The region_{min,max}_size parameters should be the values
283 // passed to page_size_for_region() and page_size should be the result of that
284 // call. The (optional) base and size parameters should come from the
285 // ReservedSpace base() and size() methods.
286 static void trace_page_sizes(const char* str, const size_t* page_sizes,
287 int count) PRODUCT_RETURN;
288 static void trace_page_sizes(const char* str, const size_t region_min_size,
289 const size_t region_max_size,
290 const size_t page_size,
291 const char* base = NULL,
292 const size_t size = 0) PRODUCT_RETURN;
294 static int vm_allocation_granularity();
295 static char* reserve_memory(size_t bytes, char* addr = 0,
296 size_t alignment_hint = 0);
297 static char* reserve_memory(size_t bytes, char* addr,
298 size_t alignment_hint, MEMFLAGS flags);
299 static char* reserve_memory_aligned(size_t size, size_t alignment);
300 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
301 static void split_reserved_memory(char *base, size_t size,
302 size_t split, bool realloc);
303 static bool commit_memory(char* addr, size_t bytes, bool executable);
304 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
305 bool executable);
306 // Same as commit_memory() that either succeeds or calls
307 // vm_exit_out_of_memory() with the specified mesg.
308 static void commit_memory_or_exit(char* addr, size_t bytes,
309 bool executable, const char* mesg);
310 static void commit_memory_or_exit(char* addr, size_t size,
311 size_t alignment_hint,
312 bool executable, const char* mesg);
313 static bool uncommit_memory(char* addr, size_t bytes);
314 static bool release_memory(char* addr, size_t bytes);
316 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
317 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
318 bool is_committed = true);
320 static bool guard_memory(char* addr, size_t bytes);
321 static bool unguard_memory(char* addr, size_t bytes);
322 static bool create_stack_guard_pages(char* addr, size_t bytes);
323 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
324 static bool remove_stack_guard_pages(char* addr, size_t bytes);
326 static char* map_memory(int fd, const char* file_name, size_t file_offset,
327 char *addr, size_t bytes, bool read_only = false,
328 bool allow_exec = false);
329 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
330 char *addr, size_t bytes, bool read_only,
331 bool allow_exec);
332 static bool unmap_memory(char *addr, size_t bytes);
333 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
334 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
336 // NUMA-specific interface
337 static bool numa_has_static_binding();
338 static bool numa_has_group_homing();
339 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
340 static void numa_make_global(char *addr, size_t bytes);
341 static size_t numa_get_groups_num();
342 static size_t numa_get_leaf_groups(int *ids, size_t size);
343 static bool numa_topology_changed();
344 static int numa_get_group_id();
346 // Page manipulation
347 struct page_info {
348 size_t size;
349 int lgrp_id;
350 };
351 static bool get_page_info(char *start, page_info* info);
352 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
354 static char* non_memory_address_word();
355 // reserve, commit and pin the entire memory region
356 static char* reserve_memory_special(size_t size, size_t alignment,
357 char* addr, bool executable);
358 static bool release_memory_special(char* addr, size_t bytes);
359 static void large_page_init();
360 static size_t large_page_size();
361 static bool can_commit_large_page_memory();
362 static bool can_execute_large_page_memory();
364 // OS interface to polling page
365 static address get_polling_page() { return _polling_page; }
366 static void set_polling_page(address page) { _polling_page = page; }
367 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
368 static void make_polling_page_unreadable();
369 static void make_polling_page_readable();
371 // Routines used to serialize the thread state without using membars
372 static void serialize_thread_states();
374 // Since we write to the serialize page from every thread, we
375 // want stores to be on unique cache lines whenever possible
376 // in order to minimize CPU cross talk. We pre-compute the
377 // amount to shift the thread* to make this offset unique to
378 // each thread.
379 static int get_serialize_page_shift_count() {
380 return SerializePageShiftCount;
381 }
383 static void set_serialize_page_mask(uintptr_t mask) {
384 _serialize_page_mask = mask;
385 }
387 static unsigned int get_serialize_page_mask() {
388 return _serialize_page_mask;
389 }
391 static void set_memory_serialize_page(address page);
393 static address get_memory_serialize_page() {
394 return (address)_mem_serialize_page;
395 }
397 static inline void write_memory_serialize_page(JavaThread *thread) {
398 uintptr_t page_offset = ((uintptr_t)thread >>
399 get_serialize_page_shift_count()) &
400 get_serialize_page_mask();
401 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
402 }
404 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
405 if (UseMembar) return false;
406 // Previously this function calculated the exact address of this
407 // thread's serialize page, and checked if the faulting address
408 // was equal. However, some platforms mask off faulting addresses
409 // to the page size, so now we just check that the address is
410 // within the page. This makes the thread argument unnecessary,
411 // but we retain the NULL check to preserve existing behaviour.
412 if (thread == NULL) return false;
413 address page = (address) _mem_serialize_page;
414 return addr >= page && addr < (page + os::vm_page_size());
415 }
417 static void block_on_serialize_page_trap();
419 // threads
421 enum ThreadType {
422 vm_thread,
423 cgc_thread, // Concurrent GC thread
424 pgc_thread, // Parallel GC thread
425 java_thread,
426 compiler_thread,
427 watcher_thread,
428 os_thread
429 };
431 static bool create_thread(Thread* thread,
432 ThreadType thr_type,
433 size_t stack_size = 0);
434 static bool create_main_thread(JavaThread* thread);
435 static bool create_attached_thread(JavaThread* thread);
436 static void pd_start_thread(Thread* thread);
437 static void start_thread(Thread* thread);
439 static void initialize_thread(Thread* thr);
440 static void free_thread(OSThread* osthread);
442 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
443 static intx current_thread_id();
444 static int current_process_id();
445 static int sleep(Thread* thread, jlong ms, bool interruptable);
446 // Short standalone OS sleep suitable for slow path spin loop.
447 // Ignores Thread.interrupt() (so keep it short).
448 // ms = 0, will sleep for the least amount of time allowed by the OS.
449 static void naked_short_sleep(jlong ms);
450 static void infinite_sleep(); // never returns, use with CAUTION
451 static void yield(); // Yields to all threads with same priority
452 enum YieldResult {
453 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
454 YIELD_NONEREADY = 0, // No other runnable/ready threads.
455 // platform-specific yield return immediately
456 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
457 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
458 // yield that can be used in lieu of blocking.
459 } ;
460 static YieldResult NakedYield () ;
461 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
462 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
463 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
464 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
466 static void interrupt(Thread* thread);
467 static bool is_interrupted(Thread* thread, bool clear_interrupted);
469 static int pd_self_suspend_thread(Thread* thread);
471 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
472 static frame fetch_frame_from_context(void* ucVoid);
474 static ExtendedPC get_thread_pc(Thread *thread);
475 static void breakpoint();
477 static address current_stack_pointer();
478 static address current_stack_base();
479 static size_t current_stack_size();
481 static void verify_stack_alignment() PRODUCT_RETURN;
483 static int message_box(const char* title, const char* message);
484 static char* do_you_want_to_debug(const char* message);
486 // run cmd in a separate process and return its exit code; or -1 on failures
487 static int fork_and_exec(char *cmd);
489 // os::exit() is merged with vm_exit()
490 // static void exit(int num);
492 // Terminate the VM, but don't exit the process
493 static void shutdown();
495 // Terminate with an error. Default is to generate a core file on platforms
496 // that support such things. This calls shutdown() and then aborts.
497 static void abort(bool dump_core = true);
499 // Die immediately, no exit hook, no abort hook, no cleanup.
500 static void die();
502 // File i/o operations
503 static const int default_file_open_flags();
504 static int open(const char *path, int oflag, int mode);
505 static FILE* open(int fd, const char* mode);
506 static int close(int fd);
507 static jlong lseek(int fd, jlong offset, int whence);
508 static char* native_path(char *path);
509 static int ftruncate(int fd, jlong length);
510 static int fsync(int fd);
511 static int available(int fd, jlong *bytes);
513 //File i/o operations
515 static size_t read(int fd, void *buf, unsigned int nBytes);
516 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
517 static size_t write(int fd, const void *buf, unsigned int nBytes);
519 // Reading directories.
520 static DIR* opendir(const char* dirname);
521 static int readdir_buf_size(const char *path);
522 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
523 static int closedir(DIR* dirp);
525 // Dynamic library extension
526 static const char* dll_file_extension();
528 static const char* get_temp_directory();
529 static const char* get_current_directory(char *buf, size_t buflen);
531 // Builds a platform-specific full library path given a ld path and lib name
532 // Returns true if buffer contains full path to existing file, false otherwise
533 static bool dll_build_name(char* buffer, size_t size,
534 const char* pathname, const char* fname);
536 // Symbol lookup, find nearest function name; basically it implements
537 // dladdr() for all platforms. Name of the nearest function is copied
538 // to buf. Distance from its base address is optionally returned as offset.
539 // If function name is not found, buf[0] is set to '\0' and offset is
540 // set to -1 (if offset is non-NULL).
541 static bool dll_address_to_function_name(address addr, char* buf,
542 int buflen, int* offset);
544 // Locate DLL/DSO. On success, full path of the library is copied to
545 // buf, and offset is optionally set to be the distance between addr
546 // and the library's base address. On failure, buf[0] is set to '\0'
547 // and offset is set to -1 (if offset is non-NULL).
548 static bool dll_address_to_library_name(address addr, char* buf,
549 int buflen, int* offset);
551 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
552 static bool address_is_in_vm(address addr);
554 // Loads .dll/.so and
555 // in case of error it checks if .dll/.so was built for the
556 // same architecture as Hotspot is running on
557 static void* dll_load(const char *name, char *ebuf, int ebuflen);
559 // lookup symbol in a shared library
560 static void* dll_lookup(void* handle, const char* name);
562 // Unload library
563 static void dll_unload(void *lib);
565 // Return the handle of this process
566 static void* get_default_process_handle();
568 // Check for static linked agent library
569 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
570 size_t syms_len);
572 // Find agent entry point
573 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
574 const char *syms[], size_t syms_len);
576 // Print out system information; they are called by fatal error handler.
577 // Output format may be different on different platforms.
578 static void print_os_info(outputStream* st);
579 static void print_os_info_brief(outputStream* st);
580 static void print_cpu_info(outputStream* st);
581 static void pd_print_cpu_info(outputStream* st);
582 static void print_memory_info(outputStream* st);
583 static void print_dll_info(outputStream* st);
584 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
585 static void print_context(outputStream* st, void* context);
586 static void print_register_info(outputStream* st, void* context);
587 static void print_siginfo(outputStream* st, void* siginfo);
588 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
589 static void print_date_and_time(outputStream* st);
591 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
592 static size_t lasterror(char *buf, size_t len);
593 static int get_last_error();
595 // Determines whether the calling process is being debugged by a user-mode debugger.
596 static bool is_debugger_attached();
598 // wait for a key press if PauseAtExit is set
599 static void wait_for_keypress_at_exit(void);
601 // The following two functions are used by fatal error handler to trace
602 // native (C) frames. They are not part of frame.hpp/frame.cpp because
603 // frame.hpp/cpp assume thread is JavaThread, and also because different
604 // OS/compiler may have different convention or provide different API to
605 // walk C frames.
606 //
607 // We don't attempt to become a debugger, so we only follow frames if that
608 // does not require a lookup in the unwind table, which is part of the binary
609 // file but may be unsafe to read after a fatal error. So on x86, we can
610 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
611 // possible to walk C stack without having the unwind table.
612 static bool is_first_C_frame(frame *fr);
613 static frame get_sender_for_C_frame(frame *fr);
615 // return current frame. pc() and sp() are set to NULL on failure.
616 static frame current_frame();
618 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
620 // returns a string to describe the exception/signal;
621 // returns NULL if exception_code is not an OS exception/signal.
622 static const char* exception_name(int exception_code, char* buf, size_t buflen);
624 // Returns native Java library, loads if necessary
625 static void* native_java_library();
627 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
628 static void jvm_path(char *buf, jint buflen);
630 // Returns true if we are running in a headless jre.
631 static bool is_headless_jre();
633 // JNI names
634 static void print_jni_name_prefix_on(outputStream* st, int args_size);
635 static void print_jni_name_suffix_on(outputStream* st, int args_size);
637 // File conventions
638 static const char* file_separator();
639 static const char* line_separator();
640 static const char* path_separator();
642 // Init os specific system properties values
643 static void init_system_properties_values();
645 // IO operations, non-JVM_ version.
646 static int stat(const char* path, struct stat* sbuf);
647 static bool dir_is_empty(const char* path);
649 // IO operations on binary files
650 static int create_binary_file(const char* path, bool rewrite_existing);
651 static jlong current_file_offset(int fd);
652 static jlong seek_to_file_offset(int fd, jlong offset);
654 // Thread Local Storage
655 static int allocate_thread_local_storage();
656 static void thread_local_storage_at_put(int index, void* value);
657 static void* thread_local_storage_at(int index);
658 static void free_thread_local_storage(int index);
660 // Stack walk
661 static address get_caller_pc(int n = 0);
663 // General allocation (must be MT-safe)
664 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0);
665 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0);
666 static void free (void *memblock, MEMFLAGS flags = mtNone);
667 static bool check_heap(bool force = false); // verify C heap integrity
668 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
670 #ifndef PRODUCT
671 static julong num_mallocs; // # of calls to malloc/realloc
672 static julong alloc_bytes; // # of bytes allocated
673 static julong num_frees; // # of calls to free
674 static julong free_bytes; // # of bytes freed
675 #endif
677 // SocketInterface (ex HPI SocketInterface )
678 static int socket(int domain, int type, int protocol);
679 static int socket_close(int fd);
680 static int socket_shutdown(int fd, int howto);
681 static int recv(int fd, char* buf, size_t nBytes, uint flags);
682 static int send(int fd, char* buf, size_t nBytes, uint flags);
683 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
684 static int timeout(int fd, long timeout);
685 static int listen(int fd, int count);
686 static int connect(int fd, struct sockaddr* him, socklen_t len);
687 static int bind(int fd, struct sockaddr* him, socklen_t len);
688 static int accept(int fd, struct sockaddr* him, socklen_t* len);
689 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
690 struct sockaddr* from, socklen_t* fromlen);
691 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
692 static int sendto(int fd, char* buf, size_t len, uint flags,
693 struct sockaddr* to, socklen_t tolen);
694 static int socket_available(int fd, jint* pbytes);
696 static int get_sock_opt(int fd, int level, int optname,
697 char* optval, socklen_t* optlen);
698 static int set_sock_opt(int fd, int level, int optname,
699 const char* optval, socklen_t optlen);
700 static int get_host_name(char* name, int namelen);
702 static struct hostent* get_host_by_name(char* name);
704 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
705 static void signal_init();
706 static void signal_init_pd();
707 static void signal_notify(int signal_number);
708 static void* signal(int signal_number, void* handler);
709 static void signal_raise(int signal_number);
710 static int signal_wait();
711 static int signal_lookup();
712 static void* user_handler();
713 static void terminate_signal_thread();
714 static int sigexitnum_pd();
716 // random number generation
717 static long random(); // return 32bit pseudorandom number
718 static void init_random(long initval); // initialize random sequence
720 // Structured OS Exception support
721 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
723 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
724 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
726 // Get the default path to the core file
727 // Returns the length of the string
728 static int get_core_path(char* buffer, size_t bufferSize);
730 // JVMTI & JVM monitoring and management support
731 // The thread_cpu_time() and current_thread_cpu_time() are only
732 // supported if is_thread_cpu_time_supported() returns true.
733 // They are not supported on Solaris T1.
735 // Thread CPU Time - return the fast estimate on a platform
736 // On Solaris - call gethrvtime (fast) - user time only
737 // On Linux - fast clock_gettime where available - user+sys
738 // - otherwise: very slow /proc fs - user+sys
739 // On Windows - GetThreadTimes - user+sys
740 static jlong current_thread_cpu_time();
741 static jlong thread_cpu_time(Thread* t);
743 // Thread CPU Time with user_sys_cpu_time parameter.
744 //
745 // If user_sys_cpu_time is true, user+sys time is returned.
746 // Otherwise, only user time is returned
747 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
748 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
750 // Return a bunch of info about the timers.
751 // Note that the returned info for these two functions may be different
752 // on some platforms
753 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
754 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
756 static bool is_thread_cpu_time_supported();
758 // System loadavg support. Returns -1 if load average cannot be obtained.
759 static int loadavg(double loadavg[], int nelem);
761 // Hook for os specific jvm options that we don't want to abort on seeing
762 static bool obsolete_option(const JavaVMOption *option);
764 // Extensions
765 #include "runtime/os_ext.hpp"
767 public:
768 class CrashProtectionCallback : public StackObj {
769 public:
770 virtual void call() = 0;
771 };
773 // Platform dependent stuff
774 #ifdef TARGET_OS_FAMILY_linux
775 # include "os_linux.hpp"
776 # include "os_posix.hpp"
777 #endif
778 #ifdef TARGET_OS_FAMILY_solaris
779 # include "os_solaris.hpp"
780 # include "os_posix.hpp"
781 #endif
782 #ifdef TARGET_OS_FAMILY_windows
783 # include "os_windows.hpp"
784 #endif
785 #ifdef TARGET_OS_FAMILY_aix
786 # include "os_aix.hpp"
787 # include "os_posix.hpp"
788 #endif
789 #ifdef TARGET_OS_FAMILY_bsd
790 # include "os_posix.hpp"
791 # include "os_bsd.hpp"
792 #endif
793 #ifdef TARGET_OS_ARCH_linux_x86
794 # include "os_linux_x86.hpp"
795 #endif
796 #ifdef TARGET_OS_ARCH_linux_mips
797 # include "os_linux_mips.hpp"
798 #endif
799 #ifdef TARGET_OS_ARCH_linux_sparc
800 # include "os_linux_sparc.hpp"
801 #endif
802 #ifdef TARGET_OS_ARCH_linux_zero
803 # include "os_linux_zero.hpp"
804 #endif
805 #ifdef TARGET_OS_ARCH_solaris_x86
806 # include "os_solaris_x86.hpp"
807 #endif
808 #ifdef TARGET_OS_ARCH_solaris_sparc
809 # include "os_solaris_sparc.hpp"
810 #endif
811 #ifdef TARGET_OS_ARCH_windows_x86
812 # include "os_windows_x86.hpp"
813 #endif
814 #ifdef TARGET_OS_ARCH_linux_arm
815 # include "os_linux_arm.hpp"
816 #endif
817 #ifdef TARGET_OS_ARCH_linux_ppc
818 # include "os_linux_ppc.hpp"
819 #endif
820 #ifdef TARGET_OS_ARCH_aix_ppc
821 # include "os_aix_ppc.hpp"
822 #endif
823 #ifdef TARGET_OS_ARCH_bsd_x86
824 # include "os_bsd_x86.hpp"
825 #endif
826 #ifdef TARGET_OS_ARCH_bsd_zero
827 # include "os_bsd_zero.hpp"
828 #endif
830 public:
831 #ifndef PLATFORM_PRINT_NATIVE_STACK
832 // No platform-specific code for printing the native stack.
833 static bool platform_print_native_stack(outputStream* st, void* context,
834 char *buf, int buf_size) {
835 return false;
836 }
837 #endif
839 // debugging support (mostly used by debug.cpp but also fatal error handler)
840 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
842 static bool dont_yield(); // when true, JVM_Yield() is nop
843 static void print_statistics();
845 // Thread priority helpers (implemented in OS-specific part)
846 static OSReturn set_native_priority(Thread* thread, int native_prio);
847 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
848 static int java_to_os_priority[CriticalPriority + 1];
849 // Hint to the underlying OS that a task switch would not be good.
850 // Void return because it's a hint and can fail.
851 static void hint_no_preempt();
853 // Used at creation if requested by the diagnostic flag PauseAtStartup.
854 // Causes the VM to wait until an external stimulus has been applied
855 // (for Unix, that stimulus is a signal, for Windows, an external
856 // ResumeThread call)
857 static void pause();
859 // Builds a platform dependent Agent_OnLoad_<libname> function name
860 // which is used to find statically linked in agents.
861 static char* build_agent_function_name(const char *sym, const char *cname,
862 bool is_absolute_path);
864 class SuspendedThreadTaskContext {
865 public:
866 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
867 Thread* thread() const { return _thread; }
868 void* ucontext() const { return _ucontext; }
869 private:
870 Thread* _thread;
871 void* _ucontext;
872 };
874 class SuspendedThreadTask {
875 public:
876 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
877 virtual ~SuspendedThreadTask() {}
878 void run();
879 bool is_done() { return _done; }
880 virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
881 protected:
882 private:
883 void internal_do_task();
884 Thread* _thread;
885 bool _done;
886 };
888 #ifndef TARGET_OS_FAMILY_windows
889 // Suspend/resume support
890 // Protocol:
891 //
892 // a thread starts in SR_RUNNING
893 //
894 // SR_RUNNING can go to
895 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
896 // SR_SUSPEND_REQUEST can go to
897 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
898 // * SR_SUSPENDED if the stopped thread receives the signal and switches state
899 // SR_SUSPENDED can go to
900 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
901 // SR_WAKEUP_REQUEST can go to
902 // * SR_RUNNING when the stopped thread receives the signal
903 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
904 class SuspendResume {
905 public:
906 enum State {
907 SR_RUNNING,
908 SR_SUSPEND_REQUEST,
909 SR_SUSPENDED,
910 SR_WAKEUP_REQUEST
911 };
913 private:
914 volatile State _state;
916 private:
917 /* try to switch state from state "from" to state "to"
918 * returns the state set after the method is complete
919 */
920 State switch_state(State from, State to);
922 public:
923 SuspendResume() : _state(SR_RUNNING) { }
925 State state() const { return _state; }
927 State request_suspend() {
928 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
929 }
931 State cancel_suspend() {
932 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
933 }
935 State suspended() {
936 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
937 }
939 State request_wakeup() {
940 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
941 }
943 State running() {
944 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
945 }
947 bool is_running() const {
948 return _state == SR_RUNNING;
949 }
951 bool is_suspend_request() const {
952 return _state == SR_SUSPEND_REQUEST;
953 }
955 bool is_suspended() const {
956 return _state == SR_SUSPENDED;
957 }
958 };
959 #endif
962 protected:
963 static long _rand_seed; // seed for random number generator
964 static int _processor_count; // number of processors
966 static char* format_boot_path(const char* format_string,
967 const char* home,
968 int home_len,
969 char fileSep,
970 char pathSep);
971 static bool set_boot_path(char fileSep, char pathSep);
972 static char** split_path(const char* path, int* n);
974 };
976 // Note that "PAUSE" is almost always used with synchronization
977 // so arguably we should provide Atomic::SpinPause() instead
978 // of the global SpinPause() with C linkage.
979 // It'd also be eligible for inlining on many platforms.
981 extern "C" int SpinPause();
983 #endif // SHARE_VM_RUNTIME_OS_HPP