Fri, 31 Oct 2014 12:16:20 +0100
8062169: Multiple OSR compilations issued for same bci
Summary: Fixed 'SimpleThresholdPolicy::event' to always perform OSR if an OSR nmethod is available.
Reviewed-by: kvn, iveresov
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 #ifndef SHARE_VM_RUNTIME_OS_HPP
26 #define SHARE_VM_RUNTIME_OS_HPP
28 #include "jvmtifiles/jvmti.h"
29 #include "runtime/atomic.hpp"
30 #include "runtime/extendedPC.hpp"
31 #include "runtime/handles.hpp"
32 #include "utilities/top.hpp"
33 #ifdef TARGET_OS_FAMILY_linux
34 # include "jvm_linux.h"
35 # include <setjmp.h>
36 #endif
37 #ifdef TARGET_OS_FAMILY_solaris
38 # include "jvm_solaris.h"
39 # include <setjmp.h>
40 #endif
41 #ifdef TARGET_OS_FAMILY_windows
42 # include "jvm_windows.h"
43 #endif
44 #ifdef TARGET_OS_FAMILY_aix
45 # include "jvm_aix.h"
46 # include <setjmp.h>
47 #endif
48 #ifdef TARGET_OS_FAMILY_bsd
49 # include "jvm_bsd.h"
50 # include <setjmp.h>
51 # ifdef __APPLE__
52 # include <mach/mach_time.h>
53 # endif
54 #endif
56 class AgentLibrary;
58 // os defines the interface to operating system; this includes traditional
59 // OS services (time, I/O) as well as other functionality with system-
60 // dependent code.
62 typedef void (*dll_func)(...);
64 class Thread;
65 class JavaThread;
66 class Event;
67 class DLL;
68 class FileHandle;
69 class NativeCallStack;
71 template<class E> class GrowableArray;
73 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
75 // Platform-independent error return values from OS functions
76 enum OSReturn {
77 OS_OK = 0, // Operation was successful
78 OS_ERR = -1, // Operation failed
79 OS_INTRPT = -2, // Operation was interrupted
80 OS_TIMEOUT = -3, // Operation timed out
81 OS_NOMEM = -5, // Operation failed for lack of memory
82 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
83 };
85 enum ThreadPriority { // JLS 20.20.1-3
86 NoPriority = -1, // Initial non-priority value
87 MinPriority = 1, // Minimum priority
88 NormPriority = 5, // Normal (non-daemon) priority
89 NearMaxPriority = 9, // High priority, used for VMThread
90 MaxPriority = 10, // Highest priority, used for WatcherThread
91 // ensures that VMThread doesn't starve profiler
92 CriticalPriority = 11 // Critical thread priority
93 };
95 // Executable parameter flag for os::commit_memory() and
96 // os::commit_memory_or_exit().
97 const bool ExecMem = true;
99 // Typedef for structured exception handling support
100 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
102 class MallocTracker;
104 class os: AllStatic {
105 friend class VMStructs;
106 friend class MallocTracker;
107 public:
108 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
110 private:
111 static OSThread* _starting_thread;
112 static address _polling_page;
113 static volatile int32_t * _mem_serialize_page;
114 static uintptr_t _serialize_page_mask;
115 public:
116 static size_t _page_sizes[page_sizes_max];
118 private:
119 static void init_page_sizes(size_t default_page_size) {
120 _page_sizes[0] = default_page_size;
121 _page_sizes[1] = 0; // sentinel
122 }
124 static char* pd_reserve_memory(size_t bytes, char* addr = 0,
125 size_t alignment_hint = 0);
126 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr);
127 static void pd_split_reserved_memory(char *base, size_t size,
128 size_t split, bool realloc);
129 static bool pd_commit_memory(char* addr, size_t bytes, bool executable);
130 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
131 bool executable);
132 // Same as pd_commit_memory() that either succeeds or calls
133 // vm_exit_out_of_memory() with the specified mesg.
134 static void pd_commit_memory_or_exit(char* addr, size_t bytes,
135 bool executable, const char* mesg);
136 static void pd_commit_memory_or_exit(char* addr, size_t size,
137 size_t alignment_hint,
138 bool executable, const char* mesg);
139 static bool pd_uncommit_memory(char* addr, size_t bytes);
140 static bool pd_release_memory(char* addr, size_t bytes);
142 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset,
143 char *addr, size_t bytes, bool read_only = false,
144 bool allow_exec = false);
145 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset,
146 char *addr, size_t bytes, bool read_only,
147 bool allow_exec);
148 static bool pd_unmap_memory(char *addr, size_t bytes);
149 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
150 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
153 public:
154 static void init(void); // Called before command line parsing
155 static void init_before_ergo(void); // Called after command line parsing
156 // before VM ergonomics processing.
157 static jint init_2(void); // Called after command line parsing
158 // and VM ergonomics processing
159 static void init_globals(void) { // Called from init_globals() in init.cpp
160 init_globals_ext();
161 }
162 static void init_3(void); // Called at the end of vm init
164 // File names are case-insensitive on windows only
165 // Override me as needed
166 static int file_name_strcmp(const char* s1, const char* s2);
168 // get/unset environment variable
169 static bool getenv(const char* name, char* buffer, int len);
170 static bool unsetenv(const char* name);
172 static bool have_special_privileges();
174 static jlong javaTimeMillis();
175 static jlong javaTimeNanos();
176 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
177 static void run_periodic_checks();
180 // Returns the elapsed time in seconds since the vm started.
181 static double elapsedTime();
183 // Returns real time in seconds since an arbitrary point
184 // in the past.
185 static bool getTimesSecs(double* process_real_time,
186 double* process_user_time,
187 double* process_system_time);
189 // Interface to the performance counter
190 static jlong elapsed_counter();
191 static jlong elapsed_frequency();
193 // The "virtual time" of a thread is the amount of time a thread has
194 // actually run. The first function indicates whether the OS supports
195 // this functionality for the current thread, and if so:
196 // * the second enables vtime tracking (if that is required).
197 // * the third tells whether vtime is enabled.
198 // * the fourth returns the elapsed virtual time for the current
199 // thread.
200 static bool supports_vtime();
201 static bool enable_vtime();
202 static bool vtime_enabled();
203 static double elapsedVTime();
205 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
206 // It is MT safe, but not async-safe, as reading time zone
207 // information may require a lock on some platforms.
208 static char* local_time_string(char *buf, size_t buflen);
209 static struct tm* localtime_pd (const time_t* clock, struct tm* res);
210 // Fill in buffer with current local time as an ISO-8601 string.
211 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
212 // Returns buffer, or NULL if it failed.
213 static char* iso8601_time(char* buffer, size_t buffer_length);
215 // Interface for detecting multiprocessor system
216 static inline bool is_MP() {
217 // During bootstrap if _processor_count is not yet initialized
218 // we claim to be MP as that is safest. If any platform has a
219 // stub generator that might be triggered in this phase and for
220 // which being declared MP when in fact not, is a problem - then
221 // the bootstrap routine for the stub generator needs to check
222 // the processor count directly and leave the bootstrap routine
223 // in place until called after initialization has ocurred.
224 return (_processor_count != 1) || AssumeMP;
225 }
226 static julong available_memory();
227 static julong physical_memory();
228 static bool has_allocatable_memory_limit(julong* limit);
229 static bool is_server_class_machine();
231 // number of CPUs
232 static int processor_count() {
233 return _processor_count;
234 }
235 static void set_processor_count(int count) { _processor_count = count; }
237 // Returns the number of CPUs this process is currently allowed to run on.
238 // Note that on some OSes this can change dynamically.
239 static int active_processor_count();
241 // Bind processes to processors.
242 // This is a two step procedure:
243 // first you generate a distribution of processes to processors,
244 // then you bind processes according to that distribution.
245 // Compute a distribution for number of processes to processors.
246 // Stores the processor id's into the distribution array argument.
247 // Returns true if it worked, false if it didn't.
248 static bool distribute_processes(uint length, uint* distribution);
249 // Binds the current process to a processor.
250 // Returns true if it worked, false if it didn't.
251 static bool bind_to_processor(uint processor_id);
253 // Give a name to the current thread.
254 static void set_native_thread_name(const char *name);
256 // Interface for stack banging (predetect possible stack overflow for
257 // exception processing) There are guard pages, and above that shadow
258 // pages for stack overflow checking.
259 static bool uses_stack_guard_pages();
260 static bool allocate_stack_guard_pages();
261 static void bang_stack_shadow_pages();
262 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
264 // OS interface to Virtual Memory
266 // Return the default page size.
267 static int vm_page_size();
269 // Return the page size to use for a region of memory. The min_pages argument
270 // is a hint intended to limit fragmentation; it says the returned page size
271 // should be <= region_max_size / min_pages. Because min_pages is a hint,
272 // this routine may return a size larger than region_max_size / min_pages.
273 //
274 // The current implementation ignores min_pages if a larger page size is an
275 // exact multiple of both region_min_size and region_max_size. This allows
276 // larger pages to be used when doing so would not cause fragmentation; in
277 // particular, a single page can be used when region_min_size ==
278 // region_max_size == a supported page size.
279 static size_t page_size_for_region(size_t region_min_size,
280 size_t region_max_size,
281 uint min_pages);
282 // Return the largest page size that can be used
283 static size_t max_page_size() {
284 // The _page_sizes array is sorted in descending order.
285 return _page_sizes[0];
286 }
288 // Methods for tracing page sizes returned by the above method; enabled by
289 // TracePageSizes. The region_{min,max}_size parameters should be the values
290 // passed to page_size_for_region() and page_size should be the result of that
291 // call. The (optional) base and size parameters should come from the
292 // ReservedSpace base() and size() methods.
293 static void trace_page_sizes(const char* str, const size_t* page_sizes,
294 int count) PRODUCT_RETURN;
295 static void trace_page_sizes(const char* str, const size_t region_min_size,
296 const size_t region_max_size,
297 const size_t page_size,
298 const char* base = NULL,
299 const size_t size = 0) PRODUCT_RETURN;
301 static int vm_allocation_granularity();
302 static char* reserve_memory(size_t bytes, char* addr = 0,
303 size_t alignment_hint = 0);
304 static char* reserve_memory(size_t bytes, char* addr,
305 size_t alignment_hint, MEMFLAGS flags);
306 static char* reserve_memory_aligned(size_t size, size_t alignment);
307 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
308 static void split_reserved_memory(char *base, size_t size,
309 size_t split, bool realloc);
310 static bool commit_memory(char* addr, size_t bytes, bool executable);
311 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
312 bool executable);
313 // Same as commit_memory() that either succeeds or calls
314 // vm_exit_out_of_memory() with the specified mesg.
315 static void commit_memory_or_exit(char* addr, size_t bytes,
316 bool executable, const char* mesg);
317 static void commit_memory_or_exit(char* addr, size_t size,
318 size_t alignment_hint,
319 bool executable, const char* mesg);
320 static bool uncommit_memory(char* addr, size_t bytes);
321 static bool release_memory(char* addr, size_t bytes);
323 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
324 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
325 bool is_committed = true);
327 static bool guard_memory(char* addr, size_t bytes);
328 static bool unguard_memory(char* addr, size_t bytes);
329 static bool create_stack_guard_pages(char* addr, size_t bytes);
330 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
331 static bool remove_stack_guard_pages(char* addr, size_t bytes);
333 static char* map_memory(int fd, const char* file_name, size_t file_offset,
334 char *addr, size_t bytes, bool read_only = false,
335 bool allow_exec = false);
336 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
337 char *addr, size_t bytes, bool read_only,
338 bool allow_exec);
339 static bool unmap_memory(char *addr, size_t bytes);
340 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
341 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
343 // NUMA-specific interface
344 static bool numa_has_static_binding();
345 static bool numa_has_group_homing();
346 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
347 static void numa_make_global(char *addr, size_t bytes);
348 static size_t numa_get_groups_num();
349 static size_t numa_get_leaf_groups(int *ids, size_t size);
350 static bool numa_topology_changed();
351 static int numa_get_group_id();
353 // Page manipulation
354 struct page_info {
355 size_t size;
356 int lgrp_id;
357 };
358 static bool get_page_info(char *start, page_info* info);
359 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
361 static char* non_memory_address_word();
362 // reserve, commit and pin the entire memory region
363 static char* reserve_memory_special(size_t size, size_t alignment,
364 char* addr, bool executable);
365 static bool release_memory_special(char* addr, size_t bytes);
366 static void large_page_init();
367 static size_t large_page_size();
368 static bool can_commit_large_page_memory();
369 static bool can_execute_large_page_memory();
371 // OS interface to polling page
372 static address get_polling_page() { return _polling_page; }
373 static void set_polling_page(address page) { _polling_page = page; }
374 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
375 static void make_polling_page_unreadable();
376 static void make_polling_page_readable();
378 // Routines used to serialize the thread state without using membars
379 static void serialize_thread_states();
381 // Since we write to the serialize page from every thread, we
382 // want stores to be on unique cache lines whenever possible
383 // in order to minimize CPU cross talk. We pre-compute the
384 // amount to shift the thread* to make this offset unique to
385 // each thread.
386 static int get_serialize_page_shift_count() {
387 return SerializePageShiftCount;
388 }
390 static void set_serialize_page_mask(uintptr_t mask) {
391 _serialize_page_mask = mask;
392 }
394 static unsigned int get_serialize_page_mask() {
395 return _serialize_page_mask;
396 }
398 static void set_memory_serialize_page(address page);
400 static address get_memory_serialize_page() {
401 return (address)_mem_serialize_page;
402 }
404 static inline void write_memory_serialize_page(JavaThread *thread) {
405 uintptr_t page_offset = ((uintptr_t)thread >>
406 get_serialize_page_shift_count()) &
407 get_serialize_page_mask();
408 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
409 }
411 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
412 if (UseMembar) return false;
413 // Previously this function calculated the exact address of this
414 // thread's serialize page, and checked if the faulting address
415 // was equal. However, some platforms mask off faulting addresses
416 // to the page size, so now we just check that the address is
417 // within the page. This makes the thread argument unnecessary,
418 // but we retain the NULL check to preserve existing behaviour.
419 if (thread == NULL) return false;
420 address page = (address) _mem_serialize_page;
421 return addr >= page && addr < (page + os::vm_page_size());
422 }
424 static void block_on_serialize_page_trap();
426 // threads
428 enum ThreadType {
429 vm_thread,
430 cgc_thread, // Concurrent GC thread
431 pgc_thread, // Parallel GC thread
432 java_thread,
433 compiler_thread,
434 watcher_thread,
435 os_thread
436 };
438 static bool create_thread(Thread* thread,
439 ThreadType thr_type,
440 size_t stack_size = 0);
441 static bool create_main_thread(JavaThread* thread);
442 static bool create_attached_thread(JavaThread* thread);
443 static void pd_start_thread(Thread* thread);
444 static void start_thread(Thread* thread);
446 static void initialize_thread(Thread* thr);
447 static void free_thread(OSThread* osthread);
449 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
450 static intx current_thread_id();
451 static int current_process_id();
452 static int sleep(Thread* thread, jlong ms, bool interruptable);
453 // Short standalone OS sleep suitable for slow path spin loop.
454 // Ignores Thread.interrupt() (so keep it short).
455 // ms = 0, will sleep for the least amount of time allowed by the OS.
456 static void naked_short_sleep(jlong ms);
457 static void infinite_sleep(); // never returns, use with CAUTION
458 static void yield(); // Yields to all threads with same priority
459 enum YieldResult {
460 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
461 YIELD_NONEREADY = 0, // No other runnable/ready threads.
462 // platform-specific yield return immediately
463 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
464 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
465 // yield that can be used in lieu of blocking.
466 } ;
467 static YieldResult NakedYield () ;
468 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
469 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
470 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
471 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
473 static void interrupt(Thread* thread);
474 static bool is_interrupted(Thread* thread, bool clear_interrupted);
476 static int pd_self_suspend_thread(Thread* thread);
478 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
479 static frame fetch_frame_from_context(void* ucVoid);
481 static ExtendedPC get_thread_pc(Thread *thread);
482 static void breakpoint();
484 static address current_stack_pointer();
485 static address current_stack_base();
486 static size_t current_stack_size();
488 static void verify_stack_alignment() PRODUCT_RETURN;
490 static int message_box(const char* title, const char* message);
491 static char* do_you_want_to_debug(const char* message);
493 // run cmd in a separate process and return its exit code; or -1 on failures
494 static int fork_and_exec(char *cmd);
496 // os::exit() is merged with vm_exit()
497 // static void exit(int num);
499 // Terminate the VM, but don't exit the process
500 static void shutdown();
502 // Terminate with an error. Default is to generate a core file on platforms
503 // that support such things. This calls shutdown() and then aborts.
504 static void abort(bool dump_core = true);
506 // Die immediately, no exit hook, no abort hook, no cleanup.
507 static void die();
509 // File i/o operations
510 static const int default_file_open_flags();
511 static int open(const char *path, int oflag, int mode);
512 static FILE* open(int fd, const char* mode);
513 static int close(int fd);
514 static jlong lseek(int fd, jlong offset, int whence);
515 static char* native_path(char *path);
516 static int ftruncate(int fd, jlong length);
517 static int fsync(int fd);
518 static int available(int fd, jlong *bytes);
520 //File i/o operations
522 static size_t read(int fd, void *buf, unsigned int nBytes);
523 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
524 static size_t write(int fd, const void *buf, unsigned int nBytes);
526 // Reading directories.
527 static DIR* opendir(const char* dirname);
528 static int readdir_buf_size(const char *path);
529 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
530 static int closedir(DIR* dirp);
532 // Dynamic library extension
533 static const char* dll_file_extension();
535 static const char* get_temp_directory();
536 static const char* get_current_directory(char *buf, size_t buflen);
538 // Builds a platform-specific full library path given a ld path and lib name
539 // Returns true if buffer contains full path to existing file, false otherwise
540 static bool dll_build_name(char* buffer, size_t size,
541 const char* pathname, const char* fname);
543 // Symbol lookup, find nearest function name; basically it implements
544 // dladdr() for all platforms. Name of the nearest function is copied
545 // to buf. Distance from its base address is optionally returned as offset.
546 // If function name is not found, buf[0] is set to '\0' and offset is
547 // set to -1 (if offset is non-NULL).
548 static bool dll_address_to_function_name(address addr, char* buf,
549 int buflen, int* offset);
551 // Locate DLL/DSO. On success, full path of the library is copied to
552 // buf, and offset is optionally set to be the distance between addr
553 // and the library's base address. On failure, buf[0] is set to '\0'
554 // and offset is set to -1 (if offset is non-NULL).
555 static bool dll_address_to_library_name(address addr, char* buf,
556 int buflen, int* offset);
558 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
559 static bool address_is_in_vm(address addr);
561 // Loads .dll/.so and
562 // in case of error it checks if .dll/.so was built for the
563 // same architecture as Hotspot is running on
564 static void* dll_load(const char *name, char *ebuf, int ebuflen);
566 // lookup symbol in a shared library
567 static void* dll_lookup(void* handle, const char* name);
569 // Unload library
570 static void dll_unload(void *lib);
572 // Return the handle of this process
573 static void* get_default_process_handle();
575 // Check for static linked agent library
576 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
577 size_t syms_len);
579 // Find agent entry point
580 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
581 const char *syms[], size_t syms_len);
583 // Print out system information; they are called by fatal error handler.
584 // Output format may be different on different platforms.
585 static void print_os_info(outputStream* st);
586 static void print_os_info_brief(outputStream* st);
587 static void print_cpu_info(outputStream* st);
588 static void pd_print_cpu_info(outputStream* st);
589 static void print_memory_info(outputStream* st);
590 static void print_dll_info(outputStream* st);
591 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
592 static void print_context(outputStream* st, void* context);
593 static void print_register_info(outputStream* st, void* context);
594 static void print_siginfo(outputStream* st, void* siginfo);
595 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
596 static void print_date_and_time(outputStream* st);
598 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
599 static size_t lasterror(char *buf, size_t len);
600 static int get_last_error();
602 // Determines whether the calling process is being debugged by a user-mode debugger.
603 static bool is_debugger_attached();
605 // wait for a key press if PauseAtExit is set
606 static void wait_for_keypress_at_exit(void);
608 // The following two functions are used by fatal error handler to trace
609 // native (C) frames. They are not part of frame.hpp/frame.cpp because
610 // frame.hpp/cpp assume thread is JavaThread, and also because different
611 // OS/compiler may have different convention or provide different API to
612 // walk C frames.
613 //
614 // We don't attempt to become a debugger, so we only follow frames if that
615 // does not require a lookup in the unwind table, which is part of the binary
616 // file but may be unsafe to read after a fatal error. So on x86, we can
617 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
618 // possible to walk C stack without having the unwind table.
619 static bool is_first_C_frame(frame *fr);
620 static frame get_sender_for_C_frame(frame *fr);
622 // return current frame. pc() and sp() are set to NULL on failure.
623 static frame current_frame();
625 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
627 // returns a string to describe the exception/signal;
628 // returns NULL if exception_code is not an OS exception/signal.
629 static const char* exception_name(int exception_code, char* buf, size_t buflen);
631 // Returns native Java library, loads if necessary
632 static void* native_java_library();
634 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
635 static void jvm_path(char *buf, jint buflen);
637 // Returns true if we are running in a headless jre.
638 static bool is_headless_jre();
640 // JNI names
641 static void print_jni_name_prefix_on(outputStream* st, int args_size);
642 static void print_jni_name_suffix_on(outputStream* st, int args_size);
644 // File conventions
645 static const char* file_separator();
646 static const char* line_separator();
647 static const char* path_separator();
649 // Init os specific system properties values
650 static void init_system_properties_values();
652 // IO operations, non-JVM_ version.
653 static int stat(const char* path, struct stat* sbuf);
654 static bool dir_is_empty(const char* path);
656 // IO operations on binary files
657 static int create_binary_file(const char* path, bool rewrite_existing);
658 static jlong current_file_offset(int fd);
659 static jlong seek_to_file_offset(int fd, jlong offset);
661 // Thread Local Storage
662 static int allocate_thread_local_storage();
663 static void thread_local_storage_at_put(int index, void* value);
664 static void* thread_local_storage_at(int index);
665 static void free_thread_local_storage(int index);
667 // Retrieve native stack frames.
668 // Parameter:
669 // stack: an array to storage stack pointers.
670 // frames: size of above array.
671 // toSkip: number of stack frames to skip at the beginning.
672 // Return: number of stack frames captured.
673 static int get_native_stack(address* stack, int size, int toSkip = 0);
675 // General allocation (must be MT-safe)
676 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack);
677 static void* malloc (size_t size, MEMFLAGS flags);
678 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack);
679 static void* realloc (void *memblock, size_t size, MEMFLAGS flag);
681 static void free (void *memblock, MEMFLAGS flags = mtNone);
682 static bool check_heap(bool force = false); // verify C heap integrity
683 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
685 #ifndef PRODUCT
686 static julong num_mallocs; // # of calls to malloc/realloc
687 static julong alloc_bytes; // # of bytes allocated
688 static julong num_frees; // # of calls to free
689 static julong free_bytes; // # of bytes freed
690 #endif
692 // SocketInterface (ex HPI SocketInterface )
693 static int socket(int domain, int type, int protocol);
694 static int socket_close(int fd);
695 static int socket_shutdown(int fd, int howto);
696 static int recv(int fd, char* buf, size_t nBytes, uint flags);
697 static int send(int fd, char* buf, size_t nBytes, uint flags);
698 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
699 static int timeout(int fd, long timeout);
700 static int listen(int fd, int count);
701 static int connect(int fd, struct sockaddr* him, socklen_t len);
702 static int bind(int fd, struct sockaddr* him, socklen_t len);
703 static int accept(int fd, struct sockaddr* him, socklen_t* len);
704 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
705 struct sockaddr* from, socklen_t* fromlen);
706 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
707 static int sendto(int fd, char* buf, size_t len, uint flags,
708 struct sockaddr* to, socklen_t tolen);
709 static int socket_available(int fd, jint* pbytes);
711 static int get_sock_opt(int fd, int level, int optname,
712 char* optval, socklen_t* optlen);
713 static int set_sock_opt(int fd, int level, int optname,
714 const char* optval, socklen_t optlen);
715 static int get_host_name(char* name, int namelen);
717 static struct hostent* get_host_by_name(char* name);
719 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
720 static void signal_init();
721 static void signal_init_pd();
722 static void signal_notify(int signal_number);
723 static void* signal(int signal_number, void* handler);
724 static void signal_raise(int signal_number);
725 static int signal_wait();
726 static int signal_lookup();
727 static void* user_handler();
728 static void terminate_signal_thread();
729 static int sigexitnum_pd();
731 // random number generation
732 static long random(); // return 32bit pseudorandom number
733 static void init_random(long initval); // initialize random sequence
735 // Structured OS Exception support
736 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
738 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
739 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
741 // Get the default path to the core file
742 // Returns the length of the string
743 static int get_core_path(char* buffer, size_t bufferSize);
745 // JVMTI & JVM monitoring and management support
746 // The thread_cpu_time() and current_thread_cpu_time() are only
747 // supported if is_thread_cpu_time_supported() returns true.
748 // They are not supported on Solaris T1.
750 // Thread CPU Time - return the fast estimate on a platform
751 // On Solaris - call gethrvtime (fast) - user time only
752 // On Linux - fast clock_gettime where available - user+sys
753 // - otherwise: very slow /proc fs - user+sys
754 // On Windows - GetThreadTimes - user+sys
755 static jlong current_thread_cpu_time();
756 static jlong thread_cpu_time(Thread* t);
758 // Thread CPU Time with user_sys_cpu_time parameter.
759 //
760 // If user_sys_cpu_time is true, user+sys time is returned.
761 // Otherwise, only user time is returned
762 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
763 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
765 // Return a bunch of info about the timers.
766 // Note that the returned info for these two functions may be different
767 // on some platforms
768 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
769 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
771 static bool is_thread_cpu_time_supported();
773 // System loadavg support. Returns -1 if load average cannot be obtained.
774 static int loadavg(double loadavg[], int nelem);
776 // Hook for os specific jvm options that we don't want to abort on seeing
777 static bool obsolete_option(const JavaVMOption *option);
779 // Extensions
780 #include "runtime/os_ext.hpp"
782 public:
783 class CrashProtectionCallback : public StackObj {
784 public:
785 virtual void call() = 0;
786 };
788 // Platform dependent stuff
789 #ifdef TARGET_OS_FAMILY_linux
790 # include "os_linux.hpp"
791 # include "os_posix.hpp"
792 #endif
793 #ifdef TARGET_OS_FAMILY_solaris
794 # include "os_solaris.hpp"
795 # include "os_posix.hpp"
796 #endif
797 #ifdef TARGET_OS_FAMILY_windows
798 # include "os_windows.hpp"
799 #endif
800 #ifdef TARGET_OS_FAMILY_aix
801 # include "os_aix.hpp"
802 # include "os_posix.hpp"
803 #endif
804 #ifdef TARGET_OS_FAMILY_bsd
805 # include "os_posix.hpp"
806 # include "os_bsd.hpp"
807 #endif
808 #ifdef TARGET_OS_ARCH_linux_x86
809 # include "os_linux_x86.hpp"
810 #endif
811 #ifdef TARGET_OS_ARCH_linux_sparc
812 # include "os_linux_sparc.hpp"
813 #endif
814 #ifdef TARGET_OS_ARCH_linux_zero
815 # include "os_linux_zero.hpp"
816 #endif
817 #ifdef TARGET_OS_ARCH_solaris_x86
818 # include "os_solaris_x86.hpp"
819 #endif
820 #ifdef TARGET_OS_ARCH_solaris_sparc
821 # include "os_solaris_sparc.hpp"
822 #endif
823 #ifdef TARGET_OS_ARCH_windows_x86
824 # include "os_windows_x86.hpp"
825 #endif
826 #ifdef TARGET_OS_ARCH_linux_arm
827 # include "os_linux_arm.hpp"
828 #endif
829 #ifdef TARGET_OS_ARCH_linux_ppc
830 # include "os_linux_ppc.hpp"
831 #endif
832 #ifdef TARGET_OS_ARCH_aix_ppc
833 # include "os_aix_ppc.hpp"
834 #endif
835 #ifdef TARGET_OS_ARCH_bsd_x86
836 # include "os_bsd_x86.hpp"
837 #endif
838 #ifdef TARGET_OS_ARCH_bsd_zero
839 # include "os_bsd_zero.hpp"
840 #endif
842 public:
843 #ifndef PLATFORM_PRINT_NATIVE_STACK
844 // No platform-specific code for printing the native stack.
845 static bool platform_print_native_stack(outputStream* st, void* context,
846 char *buf, int buf_size) {
847 return false;
848 }
849 #endif
851 // debugging support (mostly used by debug.cpp but also fatal error handler)
852 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
854 static bool dont_yield(); // when true, JVM_Yield() is nop
855 static void print_statistics();
857 // Thread priority helpers (implemented in OS-specific part)
858 static OSReturn set_native_priority(Thread* thread, int native_prio);
859 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
860 static int java_to_os_priority[CriticalPriority + 1];
861 // Hint to the underlying OS that a task switch would not be good.
862 // Void return because it's a hint and can fail.
863 static void hint_no_preempt();
865 // Used at creation if requested by the diagnostic flag PauseAtStartup.
866 // Causes the VM to wait until an external stimulus has been applied
867 // (for Unix, that stimulus is a signal, for Windows, an external
868 // ResumeThread call)
869 static void pause();
871 // Builds a platform dependent Agent_OnLoad_<libname> function name
872 // which is used to find statically linked in agents.
873 static char* build_agent_function_name(const char *sym, const char *cname,
874 bool is_absolute_path);
876 class SuspendedThreadTaskContext {
877 public:
878 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
879 Thread* thread() const { return _thread; }
880 void* ucontext() const { return _ucontext; }
881 private:
882 Thread* _thread;
883 void* _ucontext;
884 };
886 class SuspendedThreadTask {
887 public:
888 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
889 virtual ~SuspendedThreadTask() {}
890 void run();
891 bool is_done() { return _done; }
892 virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
893 protected:
894 private:
895 void internal_do_task();
896 Thread* _thread;
897 bool _done;
898 };
900 #ifndef TARGET_OS_FAMILY_windows
901 // Suspend/resume support
902 // Protocol:
903 //
904 // a thread starts in SR_RUNNING
905 //
906 // SR_RUNNING can go to
907 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
908 // SR_SUSPEND_REQUEST can go to
909 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
910 // * SR_SUSPENDED if the stopped thread receives the signal and switches state
911 // SR_SUSPENDED can go to
912 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
913 // SR_WAKEUP_REQUEST can go to
914 // * SR_RUNNING when the stopped thread receives the signal
915 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
916 class SuspendResume {
917 public:
918 enum State {
919 SR_RUNNING,
920 SR_SUSPEND_REQUEST,
921 SR_SUSPENDED,
922 SR_WAKEUP_REQUEST
923 };
925 private:
926 volatile State _state;
928 private:
929 /* try to switch state from state "from" to state "to"
930 * returns the state set after the method is complete
931 */
932 State switch_state(State from, State to);
934 public:
935 SuspendResume() : _state(SR_RUNNING) { }
937 State state() const { return _state; }
939 State request_suspend() {
940 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
941 }
943 State cancel_suspend() {
944 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
945 }
947 State suspended() {
948 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
949 }
951 State request_wakeup() {
952 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
953 }
955 State running() {
956 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
957 }
959 bool is_running() const {
960 return _state == SR_RUNNING;
961 }
963 bool is_suspend_request() const {
964 return _state == SR_SUSPEND_REQUEST;
965 }
967 bool is_suspended() const {
968 return _state == SR_SUSPENDED;
969 }
970 };
971 #endif
974 protected:
975 static long _rand_seed; // seed for random number generator
976 static int _processor_count; // number of processors
978 static char* format_boot_path(const char* format_string,
979 const char* home,
980 int home_len,
981 char fileSep,
982 char pathSep);
983 static bool set_boot_path(char fileSep, char pathSep);
984 static char** split_path(const char* path, int* n);
986 };
988 // Note that "PAUSE" is almost always used with synchronization
989 // so arguably we should provide Atomic::SpinPause() instead
990 // of the global SpinPause() with C linkage.
991 // It'd also be eligible for inlining on many platforms.
993 extern "C" int SpinPause();
995 #endif // SHARE_VM_RUNTIME_OS_HPP