Tue, 24 Jul 2012 10:51:00 -0700
7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>
1 /*
2 * Copyright (c) 1997, 2012, 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 #endif
36 #ifdef TARGET_OS_FAMILY_solaris
37 # include "jvm_solaris.h"
38 #endif
39 #ifdef TARGET_OS_FAMILY_windows
40 # include "jvm_windows.h"
41 #endif
42 #ifdef TARGET_OS_FAMILY_bsd
43 # include "jvm_bsd.h"
44 #endif
46 // os defines the interface to operating system; this includes traditional
47 // OS services (time, I/O) as well as other functionality with system-
48 // dependent code.
50 typedef void (*dll_func)(...);
52 class Thread;
53 class JavaThread;
54 class Event;
55 class DLL;
56 class FileHandle;
57 template<class E> class GrowableArray;
59 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
61 // Platform-independent error return values from OS functions
62 enum OSReturn {
63 OS_OK = 0, // Operation was successful
64 OS_ERR = -1, // Operation failed
65 OS_INTRPT = -2, // Operation was interrupted
66 OS_TIMEOUT = -3, // Operation timed out
67 OS_NOMEM = -5, // Operation failed for lack of memory
68 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
69 };
71 enum ThreadPriority { // JLS 20.20.1-3
72 NoPriority = -1, // Initial non-priority value
73 MinPriority = 1, // Minimum priority
74 NormPriority = 5, // Normal (non-daemon) priority
75 NearMaxPriority = 9, // High priority, used for VMThread
76 MaxPriority = 10, // Highest priority, used for WatcherThread
77 // ensures that VMThread doesn't starve profiler
78 CriticalPriority = 11 // Critical thread priority
79 };
81 // Typedef for structured exception handling support
82 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
84 class os: AllStatic {
85 public:
86 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
88 private:
89 static OSThread* _starting_thread;
90 static address _polling_page;
91 static volatile int32_t * _mem_serialize_page;
92 static uintptr_t _serialize_page_mask;
93 public:
94 static size_t _page_sizes[page_sizes_max];
96 private:
97 static void init_page_sizes(size_t default_page_size) {
98 _page_sizes[0] = default_page_size;
99 _page_sizes[1] = 0; // sentinel
100 }
102 static char* pd_reserve_memory(size_t bytes, char* addr = 0,
103 size_t alignment_hint = 0);
104 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr);
105 static void pd_split_reserved_memory(char *base, size_t size,
106 size_t split, bool realloc);
107 static bool pd_commit_memory(char* addr, size_t bytes, bool executable = false);
108 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
109 bool executable = false);
110 static bool pd_uncommit_memory(char* addr, size_t bytes);
111 static bool pd_release_memory(char* addr, size_t bytes);
113 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset,
114 char *addr, size_t bytes, bool read_only = false,
115 bool allow_exec = false);
116 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset,
117 char *addr, size_t bytes, bool read_only,
118 bool allow_exec);
119 static bool pd_unmap_memory(char *addr, size_t bytes);
120 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
121 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
124 public:
125 static void init(void); // Called before command line parsing
126 static jint init_2(void); // Called after command line parsing
127 static void init_globals(void) { // Called from init_globals() in init.cpp
128 init_globals_ext();
129 }
130 static void init_3(void); // Called at the end of vm init
132 // File names are case-insensitive on windows only
133 // Override me as needed
134 static int file_name_strcmp(const char* s1, const char* s2);
136 static bool getenv(const char* name, char* buffer, int len);
137 static bool have_special_privileges();
139 static jlong javaTimeMillis();
140 static jlong javaTimeNanos();
141 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
142 static void run_periodic_checks();
145 // Returns the elapsed time in seconds since the vm started.
146 static double elapsedTime();
148 // Returns real time in seconds since an arbitrary point
149 // in the past.
150 static bool getTimesSecs(double* process_real_time,
151 double* process_user_time,
152 double* process_system_time);
154 // Interface to the performance counter
155 static jlong elapsed_counter();
156 static jlong elapsed_frequency();
158 // The "virtual time" of a thread is the amount of time a thread has
159 // actually run. The first function indicates whether the OS supports
160 // this functionality for the current thread, and if so:
161 // * the second enables vtime tracking (if that is required).
162 // * the third tells whether vtime is enabled.
163 // * the fourth returns the elapsed virtual time for the current
164 // thread.
165 static bool supports_vtime();
166 static bool enable_vtime();
167 static bool vtime_enabled();
168 static double elapsedVTime();
170 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
171 // It is MT safe, but not async-safe, as reading time zone
172 // information may require a lock on some platforms.
173 static char* local_time_string(char *buf, size_t buflen);
174 static struct tm* localtime_pd (const time_t* clock, struct tm* res);
175 // Fill in buffer with current local time as an ISO-8601 string.
176 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
177 // Returns buffer, or NULL if it failed.
178 static char* iso8601_time(char* buffer, size_t buffer_length);
180 // Interface for detecting multiprocessor system
181 static inline bool is_MP() {
182 assert(_processor_count > 0, "invalid processor count");
183 return _processor_count > 1;
184 }
185 static julong available_memory();
186 static julong physical_memory();
187 static julong allocatable_physical_memory(julong size);
188 static bool is_server_class_machine();
190 // number of CPUs
191 static int processor_count() {
192 return _processor_count;
193 }
194 static void set_processor_count(int count) { _processor_count = count; }
196 // Returns the number of CPUs this process is currently allowed to run on.
197 // Note that on some OSes this can change dynamically.
198 static int active_processor_count();
200 // Bind processes to processors.
201 // This is a two step procedure:
202 // first you generate a distribution of processes to processors,
203 // then you bind processes according to that distribution.
204 // Compute a distribution for number of processes to processors.
205 // Stores the processor id's into the distribution array argument.
206 // Returns true if it worked, false if it didn't.
207 static bool distribute_processes(uint length, uint* distribution);
208 // Binds the current process to a processor.
209 // Returns true if it worked, false if it didn't.
210 static bool bind_to_processor(uint processor_id);
212 // Give a name to the current thread.
213 static void set_native_thread_name(const char *name);
215 // Interface for stack banging (predetect possible stack overflow for
216 // exception processing) There are guard pages, and above that shadow
217 // pages for stack overflow checking.
218 static bool uses_stack_guard_pages();
219 static bool allocate_stack_guard_pages();
220 static void bang_stack_shadow_pages();
221 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
223 // OS interface to Virtual Memory
225 // Return the default page size.
226 static int vm_page_size();
228 // Return the page size to use for a region of memory. The min_pages argument
229 // is a hint intended to limit fragmentation; it says the returned page size
230 // should be <= region_max_size / min_pages. Because min_pages is a hint,
231 // this routine may return a size larger than region_max_size / min_pages.
232 //
233 // The current implementation ignores min_pages if a larger page size is an
234 // exact multiple of both region_min_size and region_max_size. This allows
235 // larger pages to be used when doing so would not cause fragmentation; in
236 // particular, a single page can be used when region_min_size ==
237 // region_max_size == a supported page size.
238 static size_t page_size_for_region(size_t region_min_size,
239 size_t region_max_size,
240 uint min_pages);
242 // Methods for tracing page sizes returned by the above method; enabled by
243 // TracePageSizes. The region_{min,max}_size parameters should be the values
244 // passed to page_size_for_region() and page_size should be the result of that
245 // call. The (optional) base and size parameters should come from the
246 // ReservedSpace base() and size() methods.
247 static void trace_page_sizes(const char* str, const size_t* page_sizes,
248 int count) PRODUCT_RETURN;
249 static void trace_page_sizes(const char* str, const size_t region_min_size,
250 const size_t region_max_size,
251 const size_t page_size,
252 const char* base = NULL,
253 const size_t size = 0) PRODUCT_RETURN;
255 static int vm_allocation_granularity();
256 static char* reserve_memory(size_t bytes, char* addr = 0,
257 size_t alignment_hint = 0);
258 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
259 static void split_reserved_memory(char *base, size_t size,
260 size_t split, bool realloc);
261 static bool commit_memory(char* addr, size_t bytes, bool executable = false);
262 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
263 bool executable = false);
264 static bool uncommit_memory(char* addr, size_t bytes);
265 static bool release_memory(char* addr, size_t bytes);
267 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
268 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
269 bool is_committed = true);
271 static bool guard_memory(char* addr, size_t bytes);
272 static bool unguard_memory(char* addr, size_t bytes);
273 static bool create_stack_guard_pages(char* addr, size_t bytes);
274 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
275 static bool remove_stack_guard_pages(char* addr, size_t bytes);
277 static char* map_memory(int fd, const char* file_name, size_t file_offset,
278 char *addr, size_t bytes, bool read_only = false,
279 bool allow_exec = false);
280 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
281 char *addr, size_t bytes, bool read_only,
282 bool allow_exec);
283 static bool unmap_memory(char *addr, size_t bytes);
284 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
285 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
287 // NUMA-specific interface
288 static bool numa_has_static_binding();
289 static bool numa_has_group_homing();
290 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
291 static void numa_make_global(char *addr, size_t bytes);
292 static size_t numa_get_groups_num();
293 static size_t numa_get_leaf_groups(int *ids, size_t size);
294 static bool numa_topology_changed();
295 static int numa_get_group_id();
297 // Page manipulation
298 struct page_info {
299 size_t size;
300 int lgrp_id;
301 };
302 static bool get_page_info(char *start, page_info* info);
303 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
305 static char* non_memory_address_word();
306 // reserve, commit and pin the entire memory region
307 static char* reserve_memory_special(size_t size, char* addr = NULL,
308 bool executable = false);
309 static bool release_memory_special(char* addr, size_t bytes);
310 static void large_page_init();
311 static size_t large_page_size();
312 static bool can_commit_large_page_memory();
313 static bool can_execute_large_page_memory();
315 // OS interface to polling page
316 static address get_polling_page() { return _polling_page; }
317 static void set_polling_page(address page) { _polling_page = page; }
318 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
319 static void make_polling_page_unreadable();
320 static void make_polling_page_readable();
322 // Routines used to serialize the thread state without using membars
323 static void serialize_thread_states();
325 // Since we write to the serialize page from every thread, we
326 // want stores to be on unique cache lines whenever possible
327 // in order to minimize CPU cross talk. We pre-compute the
328 // amount to shift the thread* to make this offset unique to
329 // each thread.
330 static int get_serialize_page_shift_count() {
331 return SerializePageShiftCount;
332 }
334 static void set_serialize_page_mask(uintptr_t mask) {
335 _serialize_page_mask = mask;
336 }
338 static unsigned int get_serialize_page_mask() {
339 return _serialize_page_mask;
340 }
342 static void set_memory_serialize_page(address page);
344 static address get_memory_serialize_page() {
345 return (address)_mem_serialize_page;
346 }
348 static inline void write_memory_serialize_page(JavaThread *thread) {
349 uintptr_t page_offset = ((uintptr_t)thread >>
350 get_serialize_page_shift_count()) &
351 get_serialize_page_mask();
352 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
353 }
355 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
356 if (UseMembar) return false;
357 // Previously this function calculated the exact address of this
358 // thread's serialize page, and checked if the faulting address
359 // was equal. However, some platforms mask off faulting addresses
360 // to the page size, so now we just check that the address is
361 // within the page. This makes the thread argument unnecessary,
362 // but we retain the NULL check to preserve existing behaviour.
363 if (thread == NULL) return false;
364 address page = (address) _mem_serialize_page;
365 return addr >= page && addr < (page + os::vm_page_size());
366 }
368 static void block_on_serialize_page_trap();
370 // threads
372 enum ThreadType {
373 vm_thread,
374 cgc_thread, // Concurrent GC thread
375 pgc_thread, // Parallel GC thread
376 java_thread,
377 compiler_thread,
378 watcher_thread,
379 os_thread
380 };
382 static bool create_thread(Thread* thread,
383 ThreadType thr_type,
384 size_t stack_size = 0);
385 static bool create_main_thread(JavaThread* thread);
386 static bool create_attached_thread(JavaThread* thread);
387 static void pd_start_thread(Thread* thread);
388 static void start_thread(Thread* thread);
390 static void initialize_thread();
391 static void free_thread(OSThread* osthread);
393 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
394 static intx current_thread_id();
395 static int current_process_id();
396 static int sleep(Thread* thread, jlong ms, bool interruptable);
397 static int naked_sleep();
398 static void infinite_sleep(); // never returns, use with CAUTION
399 static void yield(); // Yields to all threads with same priority
400 enum YieldResult {
401 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
402 YIELD_NONEREADY = 0, // No other runnable/ready threads.
403 // platform-specific yield return immediately
404 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
405 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
406 // yield that can be used in lieu of blocking.
407 } ;
408 static YieldResult NakedYield () ;
409 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
410 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
411 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
412 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
414 static void interrupt(Thread* thread);
415 static bool is_interrupted(Thread* thread, bool clear_interrupted);
417 static int pd_self_suspend_thread(Thread* thread);
419 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
420 static frame fetch_frame_from_context(void* ucVoid);
422 static ExtendedPC get_thread_pc(Thread *thread);
423 static void breakpoint();
425 static address current_stack_pointer();
426 static address current_stack_base();
427 static size_t current_stack_size();
429 static void verify_stack_alignment() PRODUCT_RETURN;
431 static int message_box(const char* title, const char* message);
432 static char* do_you_want_to_debug(const char* message);
434 // run cmd in a separate process and return its exit code; or -1 on failures
435 static int fork_and_exec(char *cmd);
437 // Set file to send error reports.
438 static void set_error_file(const char *logfile);
440 // os::exit() is merged with vm_exit()
441 // static void exit(int num);
443 // Terminate the VM, but don't exit the process
444 static void shutdown();
446 // Terminate with an error. Default is to generate a core file on platforms
447 // that support such things. This calls shutdown() and then aborts.
448 static void abort(bool dump_core = true);
450 // Die immediately, no exit hook, no abort hook, no cleanup.
451 static void die();
453 // File i/o operations
454 static const int default_file_open_flags();
455 static int open(const char *path, int oflag, int mode);
456 static int close(int fd);
457 static jlong lseek(int fd, jlong offset, int whence);
458 static char* native_path(char *path);
459 static int ftruncate(int fd, jlong length);
460 static int fsync(int fd);
461 static int available(int fd, jlong *bytes);
463 //File i/o operations
465 static size_t read(int fd, void *buf, unsigned int nBytes);
466 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
467 static size_t write(int fd, const void *buf, unsigned int nBytes);
469 // Reading directories.
470 static DIR* opendir(const char* dirname);
471 static int readdir_buf_size(const char *path);
472 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
473 static int closedir(DIR* dirp);
475 // Dynamic library extension
476 static const char* dll_file_extension();
478 static const char* get_temp_directory();
479 static const char* get_current_directory(char *buf, int buflen);
481 // Builds a platform-specific full library path given a ld path and lib name
482 static void dll_build_name(char* buffer, size_t size,
483 const char* pathname, const char* fname);
485 // Symbol lookup, find nearest function name; basically it implements
486 // dladdr() for all platforms. Name of the nearest function is copied
487 // to buf. Distance from its base address is returned as offset.
488 // If function name is not found, buf[0] is set to '\0' and offset is
489 // set to -1.
490 static bool dll_address_to_function_name(address addr, char* buf,
491 int buflen, int* offset);
493 // Locate DLL/DSO. On success, full path of the library is copied to
494 // buf, and offset is set to be the distance between addr and the
495 // library's base address. On failure, buf[0] is set to '\0' and
496 // offset is set to -1.
497 static bool dll_address_to_library_name(address addr, char* buf,
498 int buflen, int* offset);
500 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
501 static bool address_is_in_vm(address addr);
503 // Loads .dll/.so and
504 // in case of error it checks if .dll/.so was built for the
505 // same architecture as Hotspot is running on
506 static void* dll_load(const char *name, char *ebuf, int ebuflen);
508 // lookup symbol in a shared library
509 static void* dll_lookup(void* handle, const char* name);
511 // Unload library
512 static void dll_unload(void *lib);
514 // Print out system information; they are called by fatal error handler.
515 // Output format may be different on different platforms.
516 static void print_os_info(outputStream* st);
517 static void print_os_info_brief(outputStream* st);
518 static void print_cpu_info(outputStream* st);
519 static void pd_print_cpu_info(outputStream* st);
520 static void print_memory_info(outputStream* st);
521 static void print_dll_info(outputStream* st);
522 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
523 static void print_context(outputStream* st, void* context);
524 static void print_register_info(outputStream* st, void* context);
525 static void print_siginfo(outputStream* st, void* siginfo);
526 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
527 static void print_date_and_time(outputStream* st);
529 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
530 static size_t lasterror(char *buf, size_t len);
531 static int get_last_error();
533 // Determines whether the calling process is being debugged by a user-mode debugger.
534 static bool is_debugger_attached();
536 // wait for a key press if PauseAtExit is set
537 static void wait_for_keypress_at_exit(void);
539 // The following two functions are used by fatal error handler to trace
540 // native (C) frames. They are not part of frame.hpp/frame.cpp because
541 // frame.hpp/cpp assume thread is JavaThread, and also because different
542 // OS/compiler may have different convention or provide different API to
543 // walk C frames.
544 //
545 // We don't attempt to become a debugger, so we only follow frames if that
546 // does not require a lookup in the unwind table, which is part of the binary
547 // file but may be unsafe to read after a fatal error. So on x86, we can
548 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
549 // possible to walk C stack without having the unwind table.
550 static bool is_first_C_frame(frame *fr);
551 static frame get_sender_for_C_frame(frame *fr);
553 // return current frame. pc() and sp() are set to NULL on failure.
554 static frame current_frame();
556 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
558 // returns a string to describe the exception/signal;
559 // returns NULL if exception_code is not an OS exception/signal.
560 static const char* exception_name(int exception_code, char* buf, size_t buflen);
562 // Returns native Java library, loads if necessary
563 static void* native_java_library();
565 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
566 static void jvm_path(char *buf, jint buflen);
568 // Returns true if we are running in a headless jre.
569 static bool is_headless_jre();
571 // JNI names
572 static void print_jni_name_prefix_on(outputStream* st, int args_size);
573 static void print_jni_name_suffix_on(outputStream* st, int args_size);
575 // File conventions
576 static const char* file_separator();
577 static const char* line_separator();
578 static const char* path_separator();
580 // Init os specific system properties values
581 static void init_system_properties_values();
583 // IO operations, non-JVM_ version.
584 static int stat(const char* path, struct stat* sbuf);
585 static bool dir_is_empty(const char* path);
587 // IO operations on binary files
588 static int create_binary_file(const char* path, bool rewrite_existing);
589 static jlong current_file_offset(int fd);
590 static jlong seek_to_file_offset(int fd, jlong offset);
592 // Thread Local Storage
593 static int allocate_thread_local_storage();
594 static void thread_local_storage_at_put(int index, void* value);
595 static void* thread_local_storage_at(int index);
596 static void free_thread_local_storage(int index);
598 // Stack walk
599 static address get_caller_pc(int n = 0);
601 // General allocation (must be MT-safe)
602 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0);
603 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0);
604 static void free (void *memblock, MEMFLAGS flags = mtNone);
605 static bool check_heap(bool force = false); // verify C heap integrity
606 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
608 #ifndef PRODUCT
609 static julong num_mallocs; // # of calls to malloc/realloc
610 static julong alloc_bytes; // # of bytes allocated
611 static julong num_frees; // # of calls to free
612 static julong free_bytes; // # of bytes freed
613 #endif
615 // SocketInterface (ex HPI SocketInterface )
616 static int socket(int domain, int type, int protocol);
617 static int socket_close(int fd);
618 static int socket_shutdown(int fd, int howto);
619 static int recv(int fd, char* buf, size_t nBytes, uint flags);
620 static int send(int fd, char* buf, size_t nBytes, uint flags);
621 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
622 static int timeout(int fd, long timeout);
623 static int listen(int fd, int count);
624 static int connect(int fd, struct sockaddr* him, socklen_t len);
625 static int bind(int fd, struct sockaddr* him, socklen_t len);
626 static int accept(int fd, struct sockaddr* him, socklen_t* len);
627 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
628 struct sockaddr* from, socklen_t* fromlen);
629 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
630 static int sendto(int fd, char* buf, size_t len, uint flags,
631 struct sockaddr* to, socklen_t tolen);
632 static int socket_available(int fd, jint* pbytes);
634 static int get_sock_opt(int fd, int level, int optname,
635 char* optval, socklen_t* optlen);
636 static int set_sock_opt(int fd, int level, int optname,
637 const char* optval, socklen_t optlen);
638 static int get_host_name(char* name, int namelen);
640 static struct hostent* get_host_by_name(char* name);
642 // Printing 64 bit integers
643 static const char* jlong_format_specifier();
644 static const char* julong_format_specifier();
646 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
647 static void signal_init();
648 static void signal_init_pd();
649 static void signal_notify(int signal_number);
650 static void* signal(int signal_number, void* handler);
651 static void signal_raise(int signal_number);
652 static int signal_wait();
653 static int signal_lookup();
654 static void* user_handler();
655 static void terminate_signal_thread();
656 static int sigexitnum_pd();
658 // random number generation
659 static long random(); // return 32bit pseudorandom number
660 static void init_random(long initval); // initialize random sequence
662 // Structured OS Exception support
663 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
665 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
666 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
668 // Get the default path to the core file
669 // Returns the length of the string
670 static int get_core_path(char* buffer, size_t bufferSize);
672 // JVMTI & JVM monitoring and management support
673 // The thread_cpu_time() and current_thread_cpu_time() are only
674 // supported if is_thread_cpu_time_supported() returns true.
675 // They are not supported on Solaris T1.
677 // Thread CPU Time - return the fast estimate on a platform
678 // On Solaris - call gethrvtime (fast) - user time only
679 // On Linux - fast clock_gettime where available - user+sys
680 // - otherwise: very slow /proc fs - user+sys
681 // On Windows - GetThreadTimes - user+sys
682 static jlong current_thread_cpu_time();
683 static jlong thread_cpu_time(Thread* t);
685 // Thread CPU Time with user_sys_cpu_time parameter.
686 //
687 // If user_sys_cpu_time is true, user+sys time is returned.
688 // Otherwise, only user time is returned
689 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
690 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
692 // Return a bunch of info about the timers.
693 // Note that the returned info for these two functions may be different
694 // on some platforms
695 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
696 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
698 static bool is_thread_cpu_time_supported();
700 // System loadavg support. Returns -1 if load average cannot be obtained.
701 static int loadavg(double loadavg[], int nelem);
703 // Hook for os specific jvm options that we don't want to abort on seeing
704 static bool obsolete_option(const JavaVMOption *option);
706 // Read file line by line. If line is longer than bsize,
707 // rest of line is skipped. Returns number of bytes read or -1 on EOF
708 static int get_line_chars(int fd, char *buf, const size_t bsize);
710 // Extensions
711 #include "runtime/os_ext.hpp"
713 public:
715 // Platform dependent stuff
716 #ifdef TARGET_OS_FAMILY_linux
717 # include "os_linux.hpp"
718 # include "os_posix.hpp"
719 #endif
720 #ifdef TARGET_OS_FAMILY_solaris
721 # include "os_solaris.hpp"
722 # include "os_posix.hpp"
723 #endif
724 #ifdef TARGET_OS_FAMILY_windows
725 # include "os_windows.hpp"
726 #endif
727 #ifdef TARGET_OS_FAMILY_bsd
728 # include "os_posix.hpp"
729 # include "os_bsd.hpp"
730 #endif
731 #ifdef TARGET_OS_ARCH_linux_x86
732 # include "os_linux_x86.hpp"
733 #endif
734 #ifdef TARGET_OS_ARCH_linux_sparc
735 # include "os_linux_sparc.hpp"
736 #endif
737 #ifdef TARGET_OS_ARCH_linux_zero
738 # include "os_linux_zero.hpp"
739 #endif
740 #ifdef TARGET_OS_ARCH_solaris_x86
741 # include "os_solaris_x86.hpp"
742 #endif
743 #ifdef TARGET_OS_ARCH_solaris_sparc
744 # include "os_solaris_sparc.hpp"
745 #endif
746 #ifdef TARGET_OS_ARCH_windows_x86
747 # include "os_windows_x86.hpp"
748 #endif
749 #ifdef TARGET_OS_ARCH_linux_arm
750 # include "os_linux_arm.hpp"
751 #endif
752 #ifdef TARGET_OS_ARCH_linux_ppc
753 # include "os_linux_ppc.hpp"
754 #endif
755 #ifdef TARGET_OS_ARCH_bsd_x86
756 # include "os_bsd_x86.hpp"
757 #endif
758 #ifdef TARGET_OS_ARCH_bsd_zero
759 # include "os_bsd_zero.hpp"
760 #endif
762 public:
763 // debugging support (mostly used by debug.cpp but also fatal error handler)
764 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
766 static bool dont_yield(); // when true, JVM_Yield() is nop
767 static void print_statistics();
769 // Thread priority helpers (implemented in OS-specific part)
770 static OSReturn set_native_priority(Thread* thread, int native_prio);
771 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
772 static int java_to_os_priority[CriticalPriority + 1];
773 // Hint to the underlying OS that a task switch would not be good.
774 // Void return because it's a hint and can fail.
775 static void hint_no_preempt();
777 // Used at creation if requested by the diagnostic flag PauseAtStartup.
778 // Causes the VM to wait until an external stimulus has been applied
779 // (for Unix, that stimulus is a signal, for Windows, an external
780 // ResumeThread call)
781 static void pause();
783 protected:
784 static long _rand_seed; // seed for random number generator
785 static int _processor_count; // number of processors
787 static char* format_boot_path(const char* format_string,
788 const char* home,
789 int home_len,
790 char fileSep,
791 char pathSep);
792 static bool set_boot_path(char fileSep, char pathSep);
793 static char** split_path(const char* path, int* n);
794 };
796 // Note that "PAUSE" is almost always used with synchronization
797 // so arguably we should provide Atomic::SpinPause() instead
798 // of the global SpinPause() with C linkage.
799 // It'd also be eligible for inlining on many platforms.
801 extern "C" int SpinPause () ;
802 extern "C" int SafeFetch32 (int * adr, int errValue) ;
803 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;
805 #endif // SHARE_VM_RUNTIME_OS_HPP