Thu, 24 May 2018 19:24:53 +0800
#7046 Disable the compilation when branch offset is beyond short branch
Contributed-by: fujie, aoqi
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 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();
161 public:
162 static void init(void); // Called before command line parsing
163 static void init_before_ergo(void); // Called after command line parsing
164 // before VM ergonomics processing.
165 static jint init_2(void); // Called after command line parsing
166 // and VM ergonomics processing
167 static void init_globals(void) { // Called from init_globals() in init.cpp
168 init_globals_ext();
169 }
171 // File names are case-insensitive on windows only
172 // Override me as needed
173 static int file_name_strcmp(const char* s1, const char* s2);
175 // get/unset environment variable
176 static bool getenv(const char* name, char* buffer, int len);
177 static bool unsetenv(const char* name);
179 static bool have_special_privileges();
181 static jlong javaTimeMillis();
182 static jlong javaTimeNanos();
183 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
184 static void run_periodic_checks();
187 // Returns the elapsed time in seconds since the vm started.
188 static double elapsedTime();
190 // Returns real time in seconds since an arbitrary point
191 // in the past.
192 static bool getTimesSecs(double* process_real_time,
193 double* process_user_time,
194 double* process_system_time);
196 // Interface to the performance counter
197 static jlong elapsed_counter();
198 static jlong elapsed_frequency();
200 // The "virtual time" of a thread is the amount of time a thread has
201 // actually run. The first function indicates whether the OS supports
202 // this functionality for the current thread, and if so:
203 // * the second enables vtime tracking (if that is required).
204 // * the third tells whether vtime is enabled.
205 // * the fourth returns the elapsed virtual time for the current
206 // thread.
207 static bool supports_vtime();
208 static bool enable_vtime();
209 static bool vtime_enabled();
210 static double elapsedVTime();
212 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
213 // It is MT safe, but not async-safe, as reading time zone
214 // information may require a lock on some platforms.
215 static char* local_time_string(char *buf, size_t buflen);
216 static struct tm* localtime_pd (const time_t* clock, struct tm* res);
217 // Fill in buffer with current local time as an ISO-8601 string.
218 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
219 // Returns buffer, or NULL if it failed.
220 static char* iso8601_time(char* buffer, size_t buffer_length);
222 // Interface for detecting multiprocessor system
223 static inline bool is_MP() {
224 // During bootstrap if _processor_count is not yet initialized
225 // we claim to be MP as that is safest. If any platform has a
226 // stub generator that might be triggered in this phase and for
227 // which being declared MP when in fact not, is a problem - then
228 // the bootstrap routine for the stub generator needs to check
229 // the processor count directly and leave the bootstrap routine
230 // in place until called after initialization has ocurred.
231 return (_processor_count != 1) || AssumeMP;
232 }
233 static julong available_memory();
234 static julong physical_memory();
235 static bool has_allocatable_memory_limit(julong* limit);
236 static bool is_server_class_machine();
238 // number of CPUs
239 static int processor_count() {
240 return _processor_count;
241 }
242 static void set_processor_count(int count) { _processor_count = count; }
244 // Returns the number of CPUs this process is currently allowed to run on.
245 // Note that on some OSes this can change dynamically.
246 static int active_processor_count();
248 // At startup the number of active CPUs this process is allowed to run on.
249 // This value does not change dynamically. May be different from active_processor_count().
250 static int initial_active_processor_count() {
251 assert(_initial_active_processor_count > 0, "Initial active processor count not set yet.");
252 return _initial_active_processor_count;
253 }
255 // Bind processes to processors.
256 // This is a two step procedure:
257 // first you generate a distribution of processes to processors,
258 // then you bind processes according to that distribution.
259 // Compute a distribution for number of processes to processors.
260 // Stores the processor id's into the distribution array argument.
261 // Returns true if it worked, false if it didn't.
262 static bool distribute_processes(uint length, uint* distribution);
263 // Binds the current process to a processor.
264 // Returns true if it worked, false if it didn't.
265 static bool bind_to_processor(uint processor_id);
267 // Give a name to the current thread.
268 static void set_native_thread_name(const char *name);
270 // Interface for stack banging (predetect possible stack overflow for
271 // exception processing) There are guard pages, and above that shadow
272 // pages for stack overflow checking.
273 static bool uses_stack_guard_pages();
274 static bool allocate_stack_guard_pages();
275 static void bang_stack_shadow_pages();
276 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
278 // OS interface to Virtual Memory
280 // Return the default page size.
281 static int vm_page_size();
283 // Returns the page size to use for a region of memory.
284 // region_size / min_pages will always be greater than or equal to the
285 // returned value. The returned value will divide region_size.
286 static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages);
288 // Returns the page size to use for a region of memory.
289 // region_size / min_pages will always be greater than or equal to the
290 // returned value. The returned value might not divide region_size.
291 static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages);
293 // Return the largest page size that can be used
294 static size_t max_page_size() {
295 // The _page_sizes array is sorted in descending order.
296 return _page_sizes[0];
297 }
299 // Methods for tracing page sizes returned by the above method; enabled by
300 // TracePageSizes. The region_{min,max}_size parameters should be the values
301 // passed to page_size_for_region() and page_size should be the result of that
302 // call. The (optional) base and size parameters should come from the
303 // ReservedSpace base() and size() methods.
304 static void trace_page_sizes(const char* str, const size_t* page_sizes,
305 int count) PRODUCT_RETURN;
306 static void trace_page_sizes(const char* str, const size_t region_min_size,
307 const size_t region_max_size,
308 const size_t page_size,
309 const char* base = NULL,
310 const size_t size = 0) PRODUCT_RETURN;
312 static int vm_allocation_granularity();
313 static char* reserve_memory(size_t bytes, char* addr = 0,
314 size_t alignment_hint = 0);
315 static char* reserve_memory(size_t bytes, char* addr,
316 size_t alignment_hint, MEMFLAGS flags);
317 static char* reserve_memory_aligned(size_t size, size_t alignment);
318 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
319 static void split_reserved_memory(char *base, size_t size,
320 size_t split, bool realloc);
321 static bool commit_memory(char* addr, size_t bytes, bool executable);
322 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
323 bool executable);
324 // Same as commit_memory() that either succeeds or calls
325 // vm_exit_out_of_memory() with the specified mesg.
326 static void commit_memory_or_exit(char* addr, size_t bytes,
327 bool executable, const char* mesg);
328 static void commit_memory_or_exit(char* addr, size_t size,
329 size_t alignment_hint,
330 bool executable, const char* mesg);
331 static bool uncommit_memory(char* addr, size_t bytes);
332 static bool release_memory(char* addr, size_t bytes);
334 // Touch memory pages that cover the memory range from start to end (exclusive)
335 // to make the OS back the memory range with actual memory.
336 // Current implementation may not touch the last page if unaligned addresses
337 // are passed.
338 static void pretouch_memory(char* start, char* end);
340 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
341 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
342 bool is_committed = true);
344 static bool guard_memory(char* addr, size_t bytes);
345 static bool unguard_memory(char* addr, size_t bytes);
346 static bool create_stack_guard_pages(char* addr, size_t bytes);
347 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
348 static bool remove_stack_guard_pages(char* addr, size_t bytes);
350 static char* map_memory(int fd, const char* file_name, size_t file_offset,
351 char *addr, size_t bytes, bool read_only = false,
352 bool allow_exec = false);
353 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
354 char *addr, size_t bytes, bool read_only,
355 bool allow_exec);
356 static bool unmap_memory(char *addr, size_t bytes);
357 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
358 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
360 // NUMA-specific interface
361 static bool numa_has_static_binding();
362 static bool numa_has_group_homing();
363 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
364 static void numa_make_global(char *addr, size_t bytes);
365 static size_t numa_get_groups_num();
366 static size_t numa_get_leaf_groups(int *ids, size_t size);
367 static bool numa_topology_changed();
368 static int numa_get_group_id();
370 // Page manipulation
371 struct page_info {
372 size_t size;
373 int lgrp_id;
374 };
375 static bool get_page_info(char *start, page_info* info);
376 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
378 static char* non_memory_address_word();
379 // reserve, commit and pin the entire memory region
380 static char* reserve_memory_special(size_t size, size_t alignment,
381 char* addr, bool executable);
382 static bool release_memory_special(char* addr, size_t bytes);
383 static void large_page_init();
384 static size_t large_page_size();
385 static bool can_commit_large_page_memory();
386 static bool can_execute_large_page_memory();
388 // OS interface to polling page
389 static address get_polling_page() { return _polling_page; }
390 static void set_polling_page(address page) { _polling_page = page; }
391 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
392 static void make_polling_page_unreadable();
393 static void make_polling_page_readable();
395 // Routines used to serialize the thread state without using membars
396 static void serialize_thread_states();
398 // Since we write to the serialize page from every thread, we
399 // want stores to be on unique cache lines whenever possible
400 // in order to minimize CPU cross talk. We pre-compute the
401 // amount to shift the thread* to make this offset unique to
402 // each thread.
403 static int get_serialize_page_shift_count() {
404 return SerializePageShiftCount;
405 }
407 static void set_serialize_page_mask(uintptr_t mask) {
408 _serialize_page_mask = mask;
409 }
411 static unsigned int get_serialize_page_mask() {
412 return _serialize_page_mask;
413 }
415 static void set_memory_serialize_page(address page);
417 static address get_memory_serialize_page() {
418 return (address)_mem_serialize_page;
419 }
421 static inline void write_memory_serialize_page(JavaThread *thread) {
422 uintptr_t page_offset = ((uintptr_t)thread >>
423 get_serialize_page_shift_count()) &
424 get_serialize_page_mask();
425 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
426 }
428 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
429 if (UseMembar) return false;
430 // Previously this function calculated the exact address of this
431 // thread's serialize page, and checked if the faulting address
432 // was equal. However, some platforms mask off faulting addresses
433 // to the page size, so now we just check that the address is
434 // within the page. This makes the thread argument unnecessary,
435 // but we retain the NULL check to preserve existing behaviour.
436 if (thread == NULL) return false;
437 address page = (address) _mem_serialize_page;
438 return addr >= page && addr < (page + os::vm_page_size());
439 }
441 static void block_on_serialize_page_trap();
443 // threads
445 enum ThreadType {
446 vm_thread,
447 cgc_thread, // Concurrent GC thread
448 pgc_thread, // Parallel GC thread
449 java_thread,
450 compiler_thread,
451 watcher_thread,
452 os_thread
453 };
455 static bool create_thread(Thread* thread,
456 ThreadType thr_type,
457 size_t stack_size = 0);
458 static bool create_main_thread(JavaThread* thread);
459 static bool create_attached_thread(JavaThread* thread);
460 static void pd_start_thread(Thread* thread);
461 static void start_thread(Thread* thread);
463 static void initialize_thread(Thread* thr);
464 static void free_thread(OSThread* osthread);
466 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
467 static intx current_thread_id();
468 static int current_process_id();
469 static int sleep(Thread* thread, jlong ms, bool interruptable);
470 // Short standalone OS sleep suitable for slow path spin loop.
471 // Ignores Thread.interrupt() (so keep it short).
472 // ms = 0, will sleep for the least amount of time allowed by the OS.
473 static void naked_short_sleep(jlong ms);
474 static void infinite_sleep(); // never returns, use with CAUTION
475 static void yield(); // Yields to all threads with same priority
476 enum YieldResult {
477 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
478 YIELD_NONEREADY = 0, // No other runnable/ready threads.
479 // platform-specific yield return immediately
480 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
481 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
482 // yield that can be used in lieu of blocking.
483 } ;
484 static YieldResult NakedYield () ;
485 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
486 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
487 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
488 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
490 static void interrupt(Thread* thread);
491 static bool is_interrupted(Thread* thread, bool clear_interrupted);
493 static int pd_self_suspend_thread(Thread* thread);
495 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
496 static frame fetch_frame_from_context(void* ucVoid);
498 static ExtendedPC get_thread_pc(Thread *thread);
499 static void breakpoint();
501 static address current_stack_pointer();
502 static address current_stack_base();
503 static size_t current_stack_size();
505 static void verify_stack_alignment() PRODUCT_RETURN;
507 static int message_box(const char* title, const char* message);
508 static char* do_you_want_to_debug(const char* message);
510 // run cmd in a separate process and return its exit code; or -1 on failures
511 static int fork_and_exec(char *cmd);
513 // os::exit() is merged with vm_exit()
514 // static void exit(int num);
516 // Terminate the VM, but don't exit the process
517 static void shutdown();
519 // Terminate with an error. Default is to generate a core file on platforms
520 // that support such things. This calls shutdown() and then aborts.
521 static void abort(bool dump_core = true);
523 // Die immediately, no exit hook, no abort hook, no cleanup.
524 static void die();
526 // File i/o operations
527 static const int default_file_open_flags();
528 static int open(const char *path, int oflag, int mode);
529 static FILE* open(int fd, const char* mode);
530 static int close(int fd);
531 static jlong lseek(int fd, jlong offset, int whence);
532 static char* native_path(char *path);
533 static int ftruncate(int fd, jlong length);
534 static int fsync(int fd);
535 static int available(int fd, jlong *bytes);
537 //File i/o operations
539 static size_t read(int fd, void *buf, unsigned int nBytes);
540 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
541 static size_t write(int fd, const void *buf, unsigned int nBytes);
543 // Reading directories.
544 static DIR* opendir(const char* dirname);
545 static int readdir_buf_size(const char *path);
546 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
547 static int closedir(DIR* dirp);
549 // Dynamic library extension
550 static const char* dll_file_extension();
552 static const char* get_temp_directory();
553 static const char* get_current_directory(char *buf, size_t buflen);
555 // Builds a platform-specific full library path given a ld path and lib name
556 // Returns true if buffer contains full path to existing file, false otherwise
557 static bool dll_build_name(char* buffer, size_t size,
558 const char* pathname, const char* fname);
560 // Symbol lookup, find nearest function name; basically it implements
561 // dladdr() for all platforms. Name of the nearest function is copied
562 // to buf. Distance from its base address is optionally returned as offset.
563 // If function name is not found, buf[0] is set to '\0' and offset is
564 // set to -1 (if offset is non-NULL).
565 static bool dll_address_to_function_name(address addr, char* buf,
566 int buflen, int* offset);
568 // Locate DLL/DSO. On success, full path of the library is copied to
569 // buf, and offset is optionally set to be the distance between addr
570 // and the library's base address. On failure, buf[0] is set to '\0'
571 // and offset is set to -1 (if offset is non-NULL).
572 static bool dll_address_to_library_name(address addr, char* buf,
573 int buflen, int* offset);
575 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
576 static bool address_is_in_vm(address addr);
578 // Loads .dll/.so and
579 // in case of error it checks if .dll/.so was built for the
580 // same architecture as Hotspot is running on
581 static void* dll_load(const char *name, char *ebuf, int ebuflen);
583 // lookup symbol in a shared library
584 static void* dll_lookup(void* handle, const char* name);
586 // Unload library
587 static void dll_unload(void *lib);
589 // Return the handle of this process
590 static void* get_default_process_handle();
592 // Check for static linked agent library
593 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
594 size_t syms_len);
596 // Find agent entry point
597 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
598 const char *syms[], size_t syms_len);
600 // Print out system information; they are called by fatal error handler.
601 // Output format may be different on different platforms.
602 static void print_os_info(outputStream* st);
603 static void print_os_info_brief(outputStream* st);
604 static void print_cpu_info(outputStream* st);
605 static void pd_print_cpu_info(outputStream* st);
606 static void print_memory_info(outputStream* st);
607 static void print_dll_info(outputStream* st);
608 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
609 static void print_context(outputStream* st, void* context);
610 static void print_register_info(outputStream* st, void* context);
611 static void print_siginfo(outputStream* st, void* siginfo);
612 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
613 static void print_date_and_time(outputStream* st);
615 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
616 static size_t lasterror(char *buf, size_t len);
617 static int get_last_error();
619 // Determines whether the calling process is being debugged by a user-mode debugger.
620 static bool is_debugger_attached();
622 // wait for a key press if PauseAtExit is set
623 static void wait_for_keypress_at_exit(void);
625 // The following two functions are used by fatal error handler to trace
626 // native (C) frames. They are not part of frame.hpp/frame.cpp because
627 // frame.hpp/cpp assume thread is JavaThread, and also because different
628 // OS/compiler may have different convention or provide different API to
629 // walk C frames.
630 //
631 // We don't attempt to become a debugger, so we only follow frames if that
632 // does not require a lookup in the unwind table, which is part of the binary
633 // file but may be unsafe to read after a fatal error. So on x86, we can
634 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
635 // possible to walk C stack without having the unwind table.
636 static bool is_first_C_frame(frame *fr);
637 static frame get_sender_for_C_frame(frame *fr);
639 // return current frame. pc() and sp() are set to NULL on failure.
640 static frame current_frame();
642 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
644 // returns a string to describe the exception/signal;
645 // returns NULL if exception_code is not an OS exception/signal.
646 static const char* exception_name(int exception_code, char* buf, size_t buflen);
648 // Returns native Java library, loads if necessary
649 static void* native_java_library();
651 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
652 static void jvm_path(char *buf, jint buflen);
654 // Returns true if we are running in a headless jre.
655 static bool is_headless_jre();
657 // JNI names
658 static void print_jni_name_prefix_on(outputStream* st, int args_size);
659 static void print_jni_name_suffix_on(outputStream* st, int args_size);
661 // File conventions
662 static const char* file_separator();
663 static const char* line_separator();
664 static const char* path_separator();
666 // Init os specific system properties values
667 static void init_system_properties_values();
669 // IO operations, non-JVM_ version.
670 static int stat(const char* path, struct stat* sbuf);
671 static bool dir_is_empty(const char* path);
673 // IO operations on binary files
674 static int create_binary_file(const char* path, bool rewrite_existing);
675 static jlong current_file_offset(int fd);
676 static jlong seek_to_file_offset(int fd, jlong offset);
678 // Thread Local Storage
679 static int allocate_thread_local_storage();
680 static void thread_local_storage_at_put(int index, void* value);
681 static void* thread_local_storage_at(int index);
682 static void free_thread_local_storage(int index);
684 // Retrieve native stack frames.
685 // Parameter:
686 // stack: an array to storage stack pointers.
687 // frames: size of above array.
688 // toSkip: number of stack frames to skip at the beginning.
689 // Return: number of stack frames captured.
690 static int get_native_stack(address* stack, int size, int toSkip = 0);
692 // General allocation (must be MT-safe)
693 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack);
694 static void* malloc (size_t size, MEMFLAGS flags);
695 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack);
696 static void* realloc (void *memblock, size_t size, MEMFLAGS flag);
698 static void free (void *memblock, MEMFLAGS flags = mtNone);
699 static bool check_heap(bool force = false); // verify C heap integrity
700 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
702 #ifndef PRODUCT
703 static julong num_mallocs; // # of calls to malloc/realloc
704 static julong alloc_bytes; // # of bytes allocated
705 static julong num_frees; // # of calls to free
706 static julong free_bytes; // # of bytes freed
707 #endif
709 // SocketInterface (ex HPI SocketInterface )
710 static int socket(int domain, int type, int protocol);
711 static int socket_close(int fd);
712 static int socket_shutdown(int fd, int howto);
713 static int recv(int fd, char* buf, size_t nBytes, uint flags);
714 static int send(int fd, char* buf, size_t nBytes, uint flags);
715 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
716 static int timeout(int fd, long timeout);
717 static int listen(int fd, int count);
718 static int connect(int fd, struct sockaddr* him, socklen_t len);
719 static int bind(int fd, struct sockaddr* him, socklen_t len);
720 static int accept(int fd, struct sockaddr* him, socklen_t* len);
721 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
722 struct sockaddr* from, socklen_t* fromlen);
723 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
724 static int sendto(int fd, char* buf, size_t len, uint flags,
725 struct sockaddr* to, socklen_t tolen);
726 static int socket_available(int fd, jint* pbytes);
728 static int get_sock_opt(int fd, int level, int optname,
729 char* optval, socklen_t* optlen);
730 static int set_sock_opt(int fd, int level, int optname,
731 const char* optval, socklen_t optlen);
732 static int get_host_name(char* name, int namelen);
734 static struct hostent* get_host_by_name(char* name);
736 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
737 static void signal_init();
738 static void signal_init_pd();
739 static void signal_notify(int signal_number);
740 static void* signal(int signal_number, void* handler);
741 static void signal_raise(int signal_number);
742 static int signal_wait();
743 static int signal_lookup();
744 static void* user_handler();
745 static void terminate_signal_thread();
746 static int sigexitnum_pd();
748 // random number generation
749 static long random(); // return 32bit pseudorandom number
750 static void init_random(long initval); // initialize random sequence
752 // Structured OS Exception support
753 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
755 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
756 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
758 // Get the default path to the core file
759 // Returns the length of the string
760 static int get_core_path(char* buffer, size_t bufferSize);
762 // JVMTI & JVM monitoring and management support
763 // The thread_cpu_time() and current_thread_cpu_time() are only
764 // supported if is_thread_cpu_time_supported() returns true.
765 // They are not supported on Solaris T1.
767 // Thread CPU Time - return the fast estimate on a platform
768 // On Solaris - call gethrvtime (fast) - user time only
769 // On Linux - fast clock_gettime where available - user+sys
770 // - otherwise: very slow /proc fs - user+sys
771 // On Windows - GetThreadTimes - user+sys
772 static jlong current_thread_cpu_time();
773 static jlong thread_cpu_time(Thread* t);
775 // Thread CPU Time with user_sys_cpu_time parameter.
776 //
777 // If user_sys_cpu_time is true, user+sys time is returned.
778 // Otherwise, only user time is returned
779 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
780 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
782 // Return a bunch of info about the timers.
783 // Note that the returned info for these two functions may be different
784 // on some platforms
785 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
786 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
788 static bool is_thread_cpu_time_supported();
790 // System loadavg support. Returns -1 if load average cannot be obtained.
791 static int loadavg(double loadavg[], int nelem);
793 // Hook for os specific jvm options that we don't want to abort on seeing
794 static bool obsolete_option(const JavaVMOption *option);
796 // Extensions
797 #include "runtime/os_ext.hpp"
799 public:
800 class CrashProtectionCallback : public StackObj {
801 public:
802 virtual void call() = 0;
803 };
805 // Platform dependent stuff
806 #ifdef TARGET_OS_FAMILY_linux
807 # include "os_linux.hpp"
808 # include "os_posix.hpp"
809 #endif
810 #ifdef TARGET_OS_FAMILY_solaris
811 # include "os_solaris.hpp"
812 # include "os_posix.hpp"
813 #endif
814 #ifdef TARGET_OS_FAMILY_windows
815 # include "os_windows.hpp"
816 #endif
817 #ifdef TARGET_OS_FAMILY_aix
818 # include "os_aix.hpp"
819 # include "os_posix.hpp"
820 #endif
821 #ifdef TARGET_OS_FAMILY_bsd
822 # include "os_posix.hpp"
823 # include "os_bsd.hpp"
824 #endif
825 #ifdef TARGET_OS_ARCH_linux_x86
826 # include "os_linux_x86.hpp"
827 #endif
828 #ifdef TARGET_OS_ARCH_linux_mips
829 # include "os_linux_mips.hpp"
830 #endif
831 #ifdef TARGET_OS_ARCH_linux_sparc
832 # include "os_linux_sparc.hpp"
833 #endif
834 #ifdef TARGET_OS_ARCH_linux_zero
835 # include "os_linux_zero.hpp"
836 #endif
837 #ifdef TARGET_OS_ARCH_solaris_x86
838 # include "os_solaris_x86.hpp"
839 #endif
840 #ifdef TARGET_OS_ARCH_solaris_sparc
841 # include "os_solaris_sparc.hpp"
842 #endif
843 #ifdef TARGET_OS_ARCH_windows_x86
844 # include "os_windows_x86.hpp"
845 #endif
846 #ifdef TARGET_OS_ARCH_linux_arm
847 # include "os_linux_arm.hpp"
848 #endif
849 #ifdef TARGET_OS_ARCH_linux_ppc
850 # include "os_linux_ppc.hpp"
851 #endif
852 #ifdef TARGET_OS_ARCH_aix_ppc
853 # include "os_aix_ppc.hpp"
854 #endif
855 #ifdef TARGET_OS_ARCH_bsd_x86
856 # include "os_bsd_x86.hpp"
857 #endif
858 #ifdef TARGET_OS_ARCH_bsd_zero
859 # include "os_bsd_zero.hpp"
860 #endif
862 public:
863 #ifndef PLATFORM_PRINT_NATIVE_STACK
864 // No platform-specific code for printing the native stack.
865 static bool platform_print_native_stack(outputStream* st, void* context,
866 char *buf, int buf_size) {
867 return false;
868 }
869 #endif
871 // debugging support (mostly used by debug.cpp but also fatal error handler)
872 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
874 static bool dont_yield(); // when true, JVM_Yield() is nop
875 static void print_statistics();
877 // Thread priority helpers (implemented in OS-specific part)
878 static OSReturn set_native_priority(Thread* thread, int native_prio);
879 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
880 static int java_to_os_priority[CriticalPriority + 1];
881 // Hint to the underlying OS that a task switch would not be good.
882 // Void return because it's a hint and can fail.
883 static void hint_no_preempt();
885 // Used at creation if requested by the diagnostic flag PauseAtStartup.
886 // Causes the VM to wait until an external stimulus has been applied
887 // (for Unix, that stimulus is a signal, for Windows, an external
888 // ResumeThread call)
889 static void pause();
891 // Builds a platform dependent Agent_OnLoad_<libname> function name
892 // which is used to find statically linked in agents.
893 static char* build_agent_function_name(const char *sym, const char *cname,
894 bool is_absolute_path);
896 class SuspendedThreadTaskContext {
897 public:
898 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
899 Thread* thread() const { return _thread; }
900 void* ucontext() const { return _ucontext; }
901 private:
902 Thread* _thread;
903 void* _ucontext;
904 };
906 class SuspendedThreadTask {
907 public:
908 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
909 virtual ~SuspendedThreadTask() {}
910 void run();
911 bool is_done() { return _done; }
912 virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
913 protected:
914 private:
915 void internal_do_task();
916 Thread* _thread;
917 bool _done;
918 };
920 #ifndef TARGET_OS_FAMILY_windows
921 // Suspend/resume support
922 // Protocol:
923 //
924 // a thread starts in SR_RUNNING
925 //
926 // SR_RUNNING can go to
927 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
928 // SR_SUSPEND_REQUEST can go to
929 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
930 // * SR_SUSPENDED if the stopped thread receives the signal and switches state
931 // SR_SUSPENDED can go to
932 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
933 // SR_WAKEUP_REQUEST can go to
934 // * SR_RUNNING when the stopped thread receives the signal
935 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
936 class SuspendResume {
937 public:
938 enum State {
939 SR_RUNNING,
940 SR_SUSPEND_REQUEST,
941 SR_SUSPENDED,
942 SR_WAKEUP_REQUEST
943 };
945 private:
946 volatile State _state;
948 private:
949 /* try to switch state from state "from" to state "to"
950 * returns the state set after the method is complete
951 */
952 State switch_state(State from, State to);
954 public:
955 SuspendResume() : _state(SR_RUNNING) { }
957 State state() const { return _state; }
959 State request_suspend() {
960 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
961 }
963 State cancel_suspend() {
964 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
965 }
967 State suspended() {
968 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
969 }
971 State request_wakeup() {
972 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
973 }
975 State running() {
976 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
977 }
979 bool is_running() const {
980 return _state == SR_RUNNING;
981 }
983 bool is_suspend_request() const {
984 return _state == SR_SUSPEND_REQUEST;
985 }
987 bool is_suspended() const {
988 return _state == SR_SUSPENDED;
989 }
990 };
991 #endif
994 protected:
995 static long _rand_seed; // seed for random number generator
996 static int _processor_count; // number of processors
997 static int _initial_active_processor_count; // number of active processors during initialization.
999 static char* format_boot_path(const char* format_string,
1000 const char* home,
1001 int home_len,
1002 char fileSep,
1003 char pathSep);
1004 static bool set_boot_path(char fileSep, char pathSep);
1005 static char** split_path(const char* path, int* n);
1007 };
1009 // Note that "PAUSE" is almost always used with synchronization
1010 // so arguably we should provide Atomic::SpinPause() instead
1011 // of the global SpinPause() with C linkage.
1012 // It'd also be eligible for inlining on many platforms.
1014 extern "C" int SpinPause();
1016 #endif // SHARE_VM_RUNTIME_OS_HPP