Mercurial > hg > truffle
annotate src/share/vm/runtime/os.hpp @ 13212:eb03a7335eb0
Use fixed instead of virtual register for target in far foreign call, since the register allocator does not support virtual registers to be used at call sites.
| author | Christian Wimmer <christian.wimmer@oracle.com> |
|---|---|
| date | Mon, 02 Dec 2013 14:20:32 -0800 |
| parents | cefad50507d8 |
| children | d8041d695d19 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_OS_HPP |
| 26 #define SHARE_VM_RUNTIME_OS_HPP | |
| 27 | |
| 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" | |
| 11151 | 35 # include <setjmp.h> |
| 1972 | 36 #endif |
| 37 #ifdef TARGET_OS_FAMILY_solaris | |
| 38 # include "jvm_solaris.h" | |
| 11151 | 39 # include <setjmp.h> |
| 1972 | 40 #endif |
| 41 #ifdef TARGET_OS_FAMILY_windows | |
| 42 # include "jvm_windows.h" | |
| 43 #endif | |
| 3960 | 44 #ifdef TARGET_OS_FAMILY_bsd |
| 45 # include "jvm_bsd.h" | |
| 11151 | 46 # include <setjmp.h> |
| 3960 | 47 #endif |
| 1972 | 48 |
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49 class AgentLibrary; |
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50 |
| 0 | 51 // os defines the interface to operating system; this includes traditional |
| 52 // OS services (time, I/O) as well as other functionality with system- | |
| 53 // dependent code. | |
| 54 | |
| 55 typedef void (*dll_func)(...); | |
| 56 | |
| 57 class Thread; | |
| 58 class JavaThread; | |
| 59 class Event; | |
| 60 class DLL; | |
| 61 class FileHandle; | |
| 141 | 62 template<class E> class GrowableArray; |
| 0 | 63 |
| 64 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
| 65 | |
| 66 // Platform-independent error return values from OS functions | |
| 67 enum OSReturn { | |
| 68 OS_OK = 0, // Operation was successful | |
| 69 OS_ERR = -1, // Operation failed | |
| 70 OS_INTRPT = -2, // Operation was interrupted | |
| 71 OS_TIMEOUT = -3, // Operation timed out | |
| 72 OS_NOMEM = -5, // Operation failed for lack of memory | |
| 73 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
| 74 }; | |
| 75 | |
| 76 enum ThreadPriority { // JLS 20.20.1-3 | |
| 77 NoPriority = -1, // Initial non-priority value | |
| 78 MinPriority = 1, // Minimum priority | |
| 79 NormPriority = 5, // Normal (non-daemon) priority | |
| 80 NearMaxPriority = 9, // High priority, used for VMThread | |
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81 MaxPriority = 10, // Highest priority, used for WatcherThread |
| 0 | 82 // ensures that VMThread doesn't starve profiler |
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83 CriticalPriority = 11 // Critical thread priority |
| 0 | 84 }; |
| 85 | |
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86 // Executable parameter flag for os::commit_memory() and |
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87 // os::commit_memory_or_exit(). |
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88 const bool ExecMem = true; |
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89 |
| 0 | 90 // Typedef for structured exception handling support |
| 91 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
| 92 | |
| 93 class os: AllStatic { | |
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94 friend class VMStructs; |
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95 |
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96 public: |
| 0 | 97 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) |
| 98 | |
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99 private: |
| 0 | 100 static OSThread* _starting_thread; |
| 101 static address _polling_page; | |
| 102 static volatile int32_t * _mem_serialize_page; | |
| 103 static uintptr_t _serialize_page_mask; | |
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104 public: |
| 0 | 105 static size_t _page_sizes[page_sizes_max]; |
| 106 | |
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107 private: |
| 0 | 108 static void init_page_sizes(size_t default_page_size) { |
| 109 _page_sizes[0] = default_page_size; | |
| 110 _page_sizes[1] = 0; // sentinel | |
| 111 } | |
| 112 | |
| 6197 | 113 static char* pd_reserve_memory(size_t bytes, char* addr = 0, |
| 114 size_t alignment_hint = 0); | |
| 115 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); | |
| 116 static void pd_split_reserved_memory(char *base, size_t size, | |
| 117 size_t split, bool realloc); | |
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118 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); |
| 6197 | 119 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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120 bool executable); |
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121 // Same as pd_commit_memory() that either succeeds or calls |
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122 // vm_exit_out_of_memory() with the specified mesg. |
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123 static void pd_commit_memory_or_exit(char* addr, size_t bytes, |
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124 bool executable, const char* mesg); |
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125 static void pd_commit_memory_or_exit(char* addr, size_t size, |
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126 size_t alignment_hint, |
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127 bool executable, const char* mesg); |
| 6197 | 128 static bool pd_uncommit_memory(char* addr, size_t bytes); |
| 129 static bool pd_release_memory(char* addr, size_t bytes); | |
| 130 | |
| 131 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, | |
| 132 char *addr, size_t bytes, bool read_only = false, | |
| 133 bool allow_exec = false); | |
| 134 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, | |
| 135 char *addr, size_t bytes, bool read_only, | |
| 136 bool allow_exec); | |
| 137 static bool pd_unmap_memory(char *addr, size_t bytes); | |
| 138 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); | |
| 139 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
| 140 | |
| 141 | |
| 0 | 142 public: |
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143 static void init(void); // Called before command line parsing |
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144 static void init_before_ergo(void); // Called after command line parsing |
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145 // before VM ergonomics processing. |
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146 static jint init_2(void); // Called after command line parsing |
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147 // and VM ergonomics processing |
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148 static void init_globals(void) { // Called from init_globals() in init.cpp |
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149 init_globals_ext(); |
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150 } |
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151 static void init_3(void); // Called at the end of vm init |
| 0 | 152 |
| 153 // File names are case-insensitive on windows only | |
| 154 // Override me as needed | |
| 155 static int file_name_strcmp(const char* s1, const char* s2); | |
| 156 | |
| 157 static bool getenv(const char* name, char* buffer, int len); | |
| 158 static bool have_special_privileges(); | |
| 159 | |
| 160 static jlong javaTimeMillis(); | |
| 161 static jlong javaTimeNanos(); | |
| 162 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
| 163 static void run_periodic_checks(); | |
| 164 | |
| 165 | |
| 166 // Returns the elapsed time in seconds since the vm started. | |
| 167 static double elapsedTime(); | |
| 168 | |
| 169 // Returns real time in seconds since an arbitrary point | |
| 170 // in the past. | |
| 171 static bool getTimesSecs(double* process_real_time, | |
| 172 double* process_user_time, | |
| 173 double* process_system_time); | |
| 174 | |
| 175 // Interface to the performance counter | |
| 176 static jlong elapsed_counter(); | |
| 177 static jlong elapsed_frequency(); | |
| 178 | |
|
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179 // The "virtual time" of a thread is the amount of time a thread has |
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180 // actually run. The first function indicates whether the OS supports |
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181 // this functionality for the current thread, and if so: |
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182 // * the second enables vtime tracking (if that is required). |
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183 // * the third tells whether vtime is enabled. |
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184 // * the fourth returns the elapsed virtual time for the current |
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185 // thread. |
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186 static bool supports_vtime(); |
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187 static bool enable_vtime(); |
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188 static bool vtime_enabled(); |
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189 static double elapsedVTime(); |
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190 |
| 0 | 191 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
| 192 // It is MT safe, but not async-safe, as reading time zone | |
| 193 // information may require a lock on some platforms. | |
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194 static char* local_time_string(char *buf, size_t buflen); |
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195 static struct tm* localtime_pd (const time_t* clock, struct tm* res); |
| 0 | 196 // Fill in buffer with current local time as an ISO-8601 string. |
| 197 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
| 198 // Returns buffer, or NULL if it failed. | |
| 199 static char* iso8601_time(char* buffer, size_t buffer_length); | |
| 200 | |
| 201 // Interface for detecting multiprocessor system | |
| 202 static inline bool is_MP() { | |
| 203 assert(_processor_count > 0, "invalid processor count"); | |
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204 return _processor_count > 1 || AssumeMP; |
| 0 | 205 } |
| 206 static julong available_memory(); | |
| 207 static julong physical_memory(); | |
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208 static bool has_allocatable_memory_limit(julong* limit); |
| 0 | 209 static bool is_server_class_machine(); |
| 210 | |
| 211 // number of CPUs | |
| 212 static int processor_count() { | |
| 213 return _processor_count; | |
| 214 } | |
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215 static void set_processor_count(int count) { _processor_count = count; } |
| 0 | 216 |
| 217 // Returns the number of CPUs this process is currently allowed to run on. | |
| 218 // Note that on some OSes this can change dynamically. | |
| 219 static int active_processor_count(); | |
| 220 | |
| 221 // Bind processes to processors. | |
| 222 // This is a two step procedure: | |
| 223 // first you generate a distribution of processes to processors, | |
| 224 // then you bind processes according to that distribution. | |
| 225 // Compute a distribution for number of processes to processors. | |
| 226 // Stores the processor id's into the distribution array argument. | |
| 227 // Returns true if it worked, false if it didn't. | |
| 228 static bool distribute_processes(uint length, uint* distribution); | |
| 229 // Binds the current process to a processor. | |
| 230 // Returns true if it worked, false if it didn't. | |
| 231 static bool bind_to_processor(uint processor_id); | |
| 232 | |
| 4006 | 233 // Give a name to the current thread. |
| 234 static void set_native_thread_name(const char *name); | |
| 235 | |
| 0 | 236 // Interface for stack banging (predetect possible stack overflow for |
| 237 // exception processing) There are guard pages, and above that shadow | |
| 238 // pages for stack overflow checking. | |
| 239 static bool uses_stack_guard_pages(); | |
| 240 static bool allocate_stack_guard_pages(); | |
| 241 static void bang_stack_shadow_pages(); | |
| 242 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
| 243 | |
| 244 // OS interface to Virtual Memory | |
| 245 | |
| 246 // Return the default page size. | |
| 247 static int vm_page_size(); | |
| 248 | |
| 249 // Return the page size to use for a region of memory. The min_pages argument | |
| 250 // is a hint intended to limit fragmentation; it says the returned page size | |
| 251 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
| 252 // this routine may return a size larger than region_max_size / min_pages. | |
| 253 // | |
| 254 // The current implementation ignores min_pages if a larger page size is an | |
| 255 // exact multiple of both region_min_size and region_max_size. This allows | |
| 256 // larger pages to be used when doing so would not cause fragmentation; in | |
| 257 // particular, a single page can be used when region_min_size == | |
| 258 // region_max_size == a supported page size. | |
| 259 static size_t page_size_for_region(size_t region_min_size, | |
| 260 size_t region_max_size, | |
| 261 uint min_pages); | |
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262 // Return the largest page size that can be used |
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263 static size_t max_page_size() { |
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264 // The _page_sizes array is sorted in descending order. |
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265 return _page_sizes[0]; |
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266 } |
| 0 | 267 |
| 3859 | 268 // Methods for tracing page sizes returned by the above method; enabled by |
| 0 | 269 // TracePageSizes. The region_{min,max}_size parameters should be the values |
| 270 // passed to page_size_for_region() and page_size should be the result of that | |
| 271 // call. The (optional) base and size parameters should come from the | |
| 272 // ReservedSpace base() and size() methods. | |
| 3859 | 273 static void trace_page_sizes(const char* str, const size_t* page_sizes, |
| 274 int count) PRODUCT_RETURN; | |
| 0 | 275 static void trace_page_sizes(const char* str, const size_t region_min_size, |
| 276 const size_t region_max_size, | |
| 277 const size_t page_size, | |
| 278 const char* base = NULL, | |
| 279 const size_t size = 0) PRODUCT_RETURN; | |
| 280 | |
| 281 static int vm_allocation_granularity(); | |
| 282 static char* reserve_memory(size_t bytes, char* addr = 0, | |
| 283 size_t alignment_hint = 0); | |
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284 static char* reserve_memory(size_t bytes, char* addr, |
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285 size_t alignment_hint, MEMFLAGS flags); |
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286 static char* reserve_memory_aligned(size_t size, size_t alignment); |
| 0 | 287 static char* attempt_reserve_memory_at(size_t bytes, char* addr); |
| 288 static void split_reserved_memory(char *base, size_t size, | |
| 289 size_t split, bool realloc); | |
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290 static bool commit_memory(char* addr, size_t bytes, bool executable); |
| 656 | 291 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, |
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292 bool executable); |
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293 // Same as commit_memory() that either succeeds or calls |
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294 // vm_exit_out_of_memory() with the specified mesg. |
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295 static void commit_memory_or_exit(char* addr, size_t bytes, |
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296 bool executable, const char* mesg); |
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297 static void commit_memory_or_exit(char* addr, size_t size, |
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298 size_t alignment_hint, |
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299 bool executable, const char* mesg); |
| 0 | 300 static bool uncommit_memory(char* addr, size_t bytes); |
| 301 static bool release_memory(char* addr, size_t bytes); | |
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302 |
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303 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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304 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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305 bool is_committed = true); |
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306 |
| 0 | 307 static bool guard_memory(char* addr, size_t bytes); |
| 308 static bool unguard_memory(char* addr, size_t bytes); | |
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309 static bool create_stack_guard_pages(char* addr, size_t bytes); |
| 6197 | 310 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); |
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311 static bool remove_stack_guard_pages(char* addr, size_t bytes); |
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312 |
| 0 | 313 static char* map_memory(int fd, const char* file_name, size_t file_offset, |
| 314 char *addr, size_t bytes, bool read_only = false, | |
| 315 bool allow_exec = false); | |
| 316 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
| 317 char *addr, size_t bytes, bool read_only, | |
| 318 bool allow_exec); | |
| 319 static bool unmap_memory(char *addr, size_t bytes); | |
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320 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); |
| 0 | 321 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); |
| 322 | |
| 323 // NUMA-specific interface | |
| 141 | 324 static bool numa_has_static_binding(); |
| 325 static bool numa_has_group_homing(); | |
| 326 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
| 0 | 327 static void numa_make_global(char *addr, size_t bytes); |
| 328 static size_t numa_get_groups_num(); | |
| 329 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
| 330 static bool numa_topology_changed(); | |
| 331 static int numa_get_group_id(); | |
| 332 | |
| 333 // Page manipulation | |
| 334 struct page_info { | |
| 335 size_t size; | |
| 336 int lgrp_id; | |
| 337 }; | |
| 338 static bool get_page_info(char *start, page_info* info); | |
| 339 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
| 340 | |
| 341 static char* non_memory_address_word(); | |
| 342 // reserve, commit and pin the entire memory region | |
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343 static char* reserve_memory_special(size_t size, size_t alignment, |
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344 char* addr, bool executable); |
| 0 | 345 static bool release_memory_special(char* addr, size_t bytes); |
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346 static void large_page_init(); |
| 0 | 347 static size_t large_page_size(); |
| 348 static bool can_commit_large_page_memory(); | |
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349 static bool can_execute_large_page_memory(); |
| 0 | 350 |
| 351 // OS interface to polling page | |
| 352 static address get_polling_page() { return _polling_page; } | |
| 353 static void set_polling_page(address page) { _polling_page = page; } | |
| 354 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
| 355 static void make_polling_page_unreadable(); | |
| 356 static void make_polling_page_readable(); | |
| 357 | |
| 358 // Routines used to serialize the thread state without using membars | |
| 359 static void serialize_thread_states(); | |
| 360 | |
| 361 // Since we write to the serialize page from every thread, we | |
| 362 // want stores to be on unique cache lines whenever possible | |
| 363 // in order to minimize CPU cross talk. We pre-compute the | |
| 364 // amount to shift the thread* to make this offset unique to | |
| 365 // each thread. | |
| 366 static int get_serialize_page_shift_count() { | |
| 367 return SerializePageShiftCount; | |
| 368 } | |
| 369 | |
| 370 static void set_serialize_page_mask(uintptr_t mask) { | |
| 371 _serialize_page_mask = mask; | |
| 372 } | |
| 373 | |
| 374 static unsigned int get_serialize_page_mask() { | |
| 375 return _serialize_page_mask; | |
| 376 } | |
| 377 | |
| 378 static void set_memory_serialize_page(address page); | |
| 379 | |
| 380 static address get_memory_serialize_page() { | |
| 381 return (address)_mem_serialize_page; | |
| 382 } | |
| 383 | |
| 384 static inline void write_memory_serialize_page(JavaThread *thread) { | |
| 385 uintptr_t page_offset = ((uintptr_t)thread >> | |
| 386 get_serialize_page_shift_count()) & | |
| 387 get_serialize_page_mask(); | |
| 388 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
| 389 } | |
| 390 | |
| 391 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
| 392 if (UseMembar) return false; | |
| 1078 | 393 // Previously this function calculated the exact address of this |
| 394 // thread's serialize page, and checked if the faulting address | |
| 395 // was equal. However, some platforms mask off faulting addresses | |
| 396 // to the page size, so now we just check that the address is | |
| 397 // within the page. This makes the thread argument unnecessary, | |
| 398 // but we retain the NULL check to preserve existing behaviour. | |
| 0 | 399 if (thread == NULL) return false; |
| 1078 | 400 address page = (address) _mem_serialize_page; |
| 401 return addr >= page && addr < (page + os::vm_page_size()); | |
| 0 | 402 } |
| 403 | |
| 404 static void block_on_serialize_page_trap(); | |
| 405 | |
| 406 // threads | |
| 407 | |
| 408 enum ThreadType { | |
| 409 vm_thread, | |
| 410 cgc_thread, // Concurrent GC thread | |
| 411 pgc_thread, // Parallel GC thread | |
| 412 java_thread, | |
| 413 compiler_thread, | |
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414 watcher_thread, |
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415 os_thread |
| 0 | 416 }; |
| 417 | |
| 418 static bool create_thread(Thread* thread, | |
| 419 ThreadType thr_type, | |
| 420 size_t stack_size = 0); | |
| 421 static bool create_main_thread(JavaThread* thread); | |
| 422 static bool create_attached_thread(JavaThread* thread); | |
| 423 static void pd_start_thread(Thread* thread); | |
| 424 static void start_thread(Thread* thread); | |
| 425 | |
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426 static void initialize_thread(Thread* thr); |
| 0 | 427 static void free_thread(OSThread* osthread); |
| 428 | |
| 429 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
| 430 static intx current_thread_id(); | |
| 431 static int current_process_id(); | |
| 432 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
| 433 static int naked_sleep(); | |
| 434 static void infinite_sleep(); // never returns, use with CAUTION | |
| 435 static void yield(); // Yields to all threads with same priority | |
| 436 enum YieldResult { | |
| 437 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
| 438 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
| 439 // platform-specific yield return immediately | |
| 440 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
| 441 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
| 442 // yield that can be used in lieu of blocking. | |
| 443 } ; | |
| 444 static YieldResult NakedYield () ; | |
| 445 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
| 446 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
| 447 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
| 448 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
| 449 | |
| 450 static void interrupt(Thread* thread); | |
| 451 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
| 452 | |
| 453 static int pd_self_suspend_thread(Thread* thread); | |
| 454 | |
| 455 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
| 456 static frame fetch_frame_from_context(void* ucVoid); | |
| 457 | |
| 458 static ExtendedPC get_thread_pc(Thread *thread); | |
| 459 static void breakpoint(); | |
| 460 | |
| 461 static address current_stack_pointer(); | |
| 462 static address current_stack_base(); | |
| 463 static size_t current_stack_size(); | |
| 464 | |
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465 static void verify_stack_alignment() PRODUCT_RETURN; |
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466 |
| 0 | 467 static int message_box(const char* title, const char* message); |
| 468 static char* do_you_want_to_debug(const char* message); | |
| 469 | |
| 470 // run cmd in a separate process and return its exit code; or -1 on failures | |
| 471 static int fork_and_exec(char *cmd); | |
| 472 | |
| 473 // Set file to send error reports. | |
| 474 static void set_error_file(const char *logfile); | |
| 475 | |
| 476 // os::exit() is merged with vm_exit() | |
| 477 // static void exit(int num); | |
| 478 | |
| 479 // Terminate the VM, but don't exit the process | |
| 480 static void shutdown(); | |
| 481 | |
| 482 // Terminate with an error. Default is to generate a core file on platforms | |
| 483 // that support such things. This calls shutdown() and then aborts. | |
| 484 static void abort(bool dump_core = true); | |
| 485 | |
| 486 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 487 static void die(); | |
| 488 | |
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489 // File i/o operations |
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490 static const int default_file_open_flags(); |
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491 static int open(const char *path, int oflag, int mode); |
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492 static FILE* open(int fd, const char* mode); |
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493 static int close(int fd); |
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494 static jlong lseek(int fd, jlong offset, int whence); |
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495 static char* native_path(char *path); |
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496 static int ftruncate(int fd, jlong length); |
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497 static int fsync(int fd); |
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498 static int available(int fd, jlong *bytes); |
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499 |
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500 //File i/o operations |
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501 |
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502 static size_t read(int fd, void *buf, unsigned int nBytes); |
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503 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); |
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504 static size_t write(int fd, const void *buf, unsigned int nBytes); |
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505 |
| 0 | 506 // Reading directories. |
| 507 static DIR* opendir(const char* dirname); | |
| 508 static int readdir_buf_size(const char *path); | |
| 509 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
| 510 static int closedir(DIR* dirp); | |
| 511 | |
| 512 // Dynamic library extension | |
| 513 static const char* dll_file_extension(); | |
| 514 | |
| 515 static const char* get_temp_directory(); | |
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516 static const char* get_current_directory(char *buf, size_t buflen); |
| 0 | 517 |
| 242 | 518 // Builds a platform-specific full library path given a ld path and lib name |
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519 // Returns true if buffer contains full path to existing file, false otherwise |
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520 static bool dll_build_name(char* buffer, size_t size, |
| 242 | 521 const char* pathname, const char* fname); |
| 522 | |
| 0 | 523 // Symbol lookup, find nearest function name; basically it implements |
| 524 // dladdr() for all platforms. Name of the nearest function is copied | |
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525 // to buf. Distance from its base address is optionally returned as offset. |
| 0 | 526 // If function name is not found, buf[0] is set to '\0' and offset is |
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527 // set to -1 (if offset is non-NULL). |
| 0 | 528 static bool dll_address_to_function_name(address addr, char* buf, |
| 529 int buflen, int* offset); | |
| 530 | |
| 531 // Locate DLL/DSO. On success, full path of the library is copied to | |
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532 // buf, and offset is optionally set to be the distance between addr |
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533 // and the library's base address. On failure, buf[0] is set to '\0' |
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534 // and offset is set to -1 (if offset is non-NULL). |
| 0 | 535 static bool dll_address_to_library_name(address addr, char* buf, |
| 536 int buflen, int* offset); | |
| 537 | |
| 538 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
| 539 static bool address_is_in_vm(address addr); | |
| 540 | |
| 541 // Loads .dll/.so and | |
| 542 // in case of error it checks if .dll/.so was built for the | |
| 543 // same architecture as Hotspot is running on | |
| 544 static void* dll_load(const char *name, char *ebuf, int ebuflen); | |
| 545 | |
| 242 | 546 // lookup symbol in a shared library |
| 547 static void* dll_lookup(void* handle, const char* name); | |
| 548 | |
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549 // Unload library |
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550 static void dll_unload(void *lib); |
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551 |
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552 // Return the handle of this process |
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553 static void* get_default_process_handle(); |
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554 |
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555 // Check for static linked agent library |
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556 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], |
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557 size_t syms_len); |
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558 |
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559 // Find agent entry point |
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560 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, |
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561 const char *syms[], size_t syms_len); |
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562 |
| 0 | 563 // Print out system information; they are called by fatal error handler. |
| 564 // Output format may be different on different platforms. | |
| 565 static void print_os_info(outputStream* st); | |
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566 static void print_os_info_brief(outputStream* st); |
| 0 | 567 static void print_cpu_info(outputStream* st); |
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568 static void pd_print_cpu_info(outputStream* st); |
| 0 | 569 static void print_memory_info(outputStream* st); |
| 570 static void print_dll_info(outputStream* st); | |
| 571 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
| 572 static void print_context(outputStream* st, void* context); | |
| 1907 | 573 static void print_register_info(outputStream* st, void* context); |
| 0 | 574 static void print_siginfo(outputStream* st, void* siginfo); |
| 575 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
| 576 static void print_date_and_time(outputStream* st); | |
| 577 | |
| 1907 | 578 static void print_location(outputStream* st, intptr_t x, bool verbose = false); |
|
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579 static size_t lasterror(char *buf, size_t len); |
|
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580 static int get_last_error(); |
|
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581 |
|
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582 // Determines whether the calling process is being debugged by a user-mode debugger. |
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583 static bool is_debugger_attached(); |
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584 |
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585 // wait for a key press if PauseAtExit is set |
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586 static void wait_for_keypress_at_exit(void); |
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587 |
| 0 | 588 // The following two functions are used by fatal error handler to trace |
| 589 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
| 590 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
| 591 // OS/compiler may have different convention or provide different API to | |
| 592 // walk C frames. | |
| 593 // | |
| 594 // We don't attempt to become a debugger, so we only follow frames if that | |
| 595 // does not require a lookup in the unwind table, which is part of the binary | |
| 596 // file but may be unsafe to read after a fatal error. So on x86, we can | |
| 597 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
| 598 // possible to walk C stack without having the unwind table. | |
| 599 static bool is_first_C_frame(frame *fr); | |
| 600 static frame get_sender_for_C_frame(frame *fr); | |
| 601 | |
| 602 // return current frame. pc() and sp() are set to NULL on failure. | |
| 603 static frame current_frame(); | |
| 604 | |
| 605 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
| 606 | |
| 607 // returns a string to describe the exception/signal; | |
| 608 // returns NULL if exception_code is not an OS exception/signal. | |
| 609 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
| 610 | |
| 611 // Returns native Java library, loads if necessary | |
| 612 static void* native_java_library(); | |
| 613 | |
|
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614 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) |
| 0 | 615 static void jvm_path(char *buf, jint buflen); |
| 616 | |
|
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617 // Returns true if we are running in a headless jre. |
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618 static bool is_headless_jre(); |
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|
619 |
| 0 | 620 // JNI names |
| 621 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
| 622 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
| 623 | |
| 624 // File conventions | |
| 625 static const char* file_separator(); | |
| 626 static const char* line_separator(); | |
| 627 static const char* path_separator(); | |
| 628 | |
| 629 // Init os specific system properties values | |
| 630 static void init_system_properties_values(); | |
| 631 | |
| 632 // IO operations, non-JVM_ version. | |
| 633 static int stat(const char* path, struct stat* sbuf); | |
| 634 static bool dir_is_empty(const char* path); | |
| 635 | |
| 636 // IO operations on binary files | |
| 637 static int create_binary_file(const char* path, bool rewrite_existing); | |
| 638 static jlong current_file_offset(int fd); | |
| 639 static jlong seek_to_file_offset(int fd, jlong offset); | |
| 640 | |
| 641 // Thread Local Storage | |
| 642 static int allocate_thread_local_storage(); | |
| 643 static void thread_local_storage_at_put(int index, void* value); | |
| 644 static void* thread_local_storage_at(int index); | |
| 645 static void free_thread_local_storage(int index); | |
| 646 | |
| 6197 | 647 // Stack walk |
| 648 static address get_caller_pc(int n = 0); | |
| 649 | |
| 0 | 650 // General allocation (must be MT-safe) |
| 6197 | 651 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0); |
| 652 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0); | |
| 653 static void free (void *memblock, MEMFLAGS flags = mtNone); | |
| 0 | 654 static bool check_heap(bool force = false); // verify C heap integrity |
| 6197 | 655 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup |
| 0 | 656 |
| 657 #ifndef PRODUCT | |
| 2250 | 658 static julong num_mallocs; // # of calls to malloc/realloc |
| 659 static julong alloc_bytes; // # of bytes allocated | |
| 660 static julong num_frees; // # of calls to free | |
| 661 static julong free_bytes; // # of bytes freed | |
| 0 | 662 #endif |
| 663 | |
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664 // SocketInterface (ex HPI SocketInterface ) |
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665 static int socket(int domain, int type, int protocol); |
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666 static int socket_close(int fd); |
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667 static int socket_shutdown(int fd, int howto); |
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668 static int recv(int fd, char* buf, size_t nBytes, uint flags); |
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669 static int send(int fd, char* buf, size_t nBytes, uint flags); |
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670 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); |
|
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671 static int timeout(int fd, long timeout); |
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672 static int listen(int fd, int count); |
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673 static int connect(int fd, struct sockaddr* him, socklen_t len); |
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674 static int bind(int fd, struct sockaddr* him, socklen_t len); |
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675 static int accept(int fd, struct sockaddr* him, socklen_t* len); |
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676 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, |
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677 struct sockaddr* from, socklen_t* fromlen); |
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678 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); |
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679 static int sendto(int fd, char* buf, size_t len, uint flags, |
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680 struct sockaddr* to, socklen_t tolen); |
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681 static int socket_available(int fd, jint* pbytes); |
|
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682 |
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683 static int get_sock_opt(int fd, int level, int optname, |
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684 char* optval, socklen_t* optlen); |
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685 static int set_sock_opt(int fd, int level, int optname, |
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686 const char* optval, socklen_t optlen); |
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687 static int get_host_name(char* name, int namelen); |
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688 |
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689 static struct hostent* get_host_by_name(char* name); |
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690 |
| 0 | 691 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) |
| 692 static void signal_init(); | |
| 693 static void signal_init_pd(); | |
| 694 static void signal_notify(int signal_number); | |
| 695 static void* signal(int signal_number, void* handler); | |
| 696 static void signal_raise(int signal_number); | |
| 697 static int signal_wait(); | |
| 698 static int signal_lookup(); | |
| 699 static void* user_handler(); | |
| 700 static void terminate_signal_thread(); | |
| 701 static int sigexitnum_pd(); | |
| 702 | |
| 703 // random number generation | |
| 704 static long random(); // return 32bit pseudorandom number | |
| 705 static void init_random(long initval); // initialize random sequence | |
| 706 | |
| 707 // Structured OS Exception support | |
| 708 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
| 709 | |
|
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710 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits |
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711 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); |
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712 |
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713 // Get the default path to the core file |
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714 // Returns the length of the string |
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715 static int get_core_path(char* buffer, size_t bufferSize); |
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716 |
| 0 | 717 // JVMTI & JVM monitoring and management support |
| 718 // The thread_cpu_time() and current_thread_cpu_time() are only | |
| 719 // supported if is_thread_cpu_time_supported() returns true. | |
| 720 // They are not supported on Solaris T1. | |
| 721 | |
| 722 // Thread CPU Time - return the fast estimate on a platform | |
| 723 // On Solaris - call gethrvtime (fast) - user time only | |
| 724 // On Linux - fast clock_gettime where available - user+sys | |
| 725 // - otherwise: very slow /proc fs - user+sys | |
| 726 // On Windows - GetThreadTimes - user+sys | |
| 727 static jlong current_thread_cpu_time(); | |
| 728 static jlong thread_cpu_time(Thread* t); | |
| 729 | |
| 730 // Thread CPU Time with user_sys_cpu_time parameter. | |
| 731 // | |
| 732 // If user_sys_cpu_time is true, user+sys time is returned. | |
| 733 // Otherwise, only user time is returned | |
| 734 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
| 735 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
| 736 | |
| 737 // Return a bunch of info about the timers. | |
| 738 // Note that the returned info for these two functions may be different | |
| 739 // on some platforms | |
| 740 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
| 741 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
| 742 | |
| 743 static bool is_thread_cpu_time_supported(); | |
| 744 | |
| 745 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 746 static int loadavg(double loadavg[], int nelem); | |
| 747 | |
| 748 // Hook for os specific jvm options that we don't want to abort on seeing | |
| 749 static bool obsolete_option(const JavaVMOption *option); | |
| 750 | |
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751 // Extensions |
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752 #include "runtime/os_ext.hpp" |
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753 |
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754 public: |
| 11151 | 755 class CrashProtectionCallback : public StackObj { |
| 756 public: | |
| 757 virtual void call() = 0; | |
| 758 }; | |
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759 |
| 0 | 760 // Platform dependent stuff |
| 1972 | 761 #ifdef TARGET_OS_FAMILY_linux |
| 762 # include "os_linux.hpp" | |
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763 # include "os_posix.hpp" |
| 1972 | 764 #endif |
| 765 #ifdef TARGET_OS_FAMILY_solaris | |
| 766 # include "os_solaris.hpp" | |
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767 # include "os_posix.hpp" |
| 1972 | 768 #endif |
| 769 #ifdef TARGET_OS_FAMILY_windows | |
| 770 # include "os_windows.hpp" | |
| 771 #endif | |
| 3960 | 772 #ifdef TARGET_OS_FAMILY_bsd |
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773 # include "os_posix.hpp" |
| 3960 | 774 # include "os_bsd.hpp" |
| 775 #endif | |
| 1972 | 776 #ifdef TARGET_OS_ARCH_linux_x86 |
| 777 # include "os_linux_x86.hpp" | |
| 778 #endif | |
| 779 #ifdef TARGET_OS_ARCH_linux_sparc | |
| 780 # include "os_linux_sparc.hpp" | |
| 781 #endif | |
| 782 #ifdef TARGET_OS_ARCH_linux_zero | |
| 783 # include "os_linux_zero.hpp" | |
| 784 #endif | |
| 785 #ifdef TARGET_OS_ARCH_solaris_x86 | |
| 786 # include "os_solaris_x86.hpp" | |
| 787 #endif | |
| 788 #ifdef TARGET_OS_ARCH_solaris_sparc | |
| 789 # include "os_solaris_sparc.hpp" | |
| 790 #endif | |
| 791 #ifdef TARGET_OS_ARCH_windows_x86 | |
| 792 # include "os_windows_x86.hpp" | |
| 793 #endif | |
|
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794 #ifdef TARGET_OS_ARCH_linux_arm |
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795 # include "os_linux_arm.hpp" |
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796 #endif |
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797 #ifdef TARGET_OS_ARCH_linux_ppc |
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798 # include "os_linux_ppc.hpp" |
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799 #endif |
| 3960 | 800 #ifdef TARGET_OS_ARCH_bsd_x86 |
| 801 # include "os_bsd_x86.hpp" | |
| 802 #endif | |
| 803 #ifdef TARGET_OS_ARCH_bsd_zero | |
| 804 # include "os_bsd_zero.hpp" | |
| 805 #endif | |
| 1972 | 806 |
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807 public: |
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808 #ifndef PLATFORM_PRINT_NATIVE_STACK |
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809 // No platform-specific code for printing the native stack. |
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810 static bool platform_print_native_stack(outputStream* st, void* context, |
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811 char *buf, int buf_size) { |
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812 return false; |
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813 } |
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814 #endif |
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815 |
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816 // debugging support (mostly used by debug.cpp but also fatal error handler) |
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817 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address |
| 0 | 818 |
| 819 static bool dont_yield(); // when true, JVM_Yield() is nop | |
| 820 static void print_statistics(); | |
| 821 | |
| 822 // Thread priority helpers (implemented in OS-specific part) | |
| 823 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
| 824 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
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825 static int java_to_os_priority[CriticalPriority + 1]; |
| 0 | 826 // Hint to the underlying OS that a task switch would not be good. |
| 827 // Void return because it's a hint and can fail. | |
| 828 static void hint_no_preempt(); | |
| 829 | |
| 830 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
| 831 // Causes the VM to wait until an external stimulus has been applied | |
| 832 // (for Unix, that stimulus is a signal, for Windows, an external | |
| 833 // ResumeThread call) | |
| 834 static void pause(); | |
| 835 | |
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836 // Builds a platform dependent Agent_OnLoad_<libname> function name |
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837 // which is used to find statically linked in agents. |
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838 static char* build_agent_function_name(const char *sym, const char *cname, |
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839 bool is_absolute_path); |
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840 |
| 10405 | 841 class SuspendedThreadTaskContext { |
| 842 public: | |
| 843 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} | |
| 844 Thread* thread() const { return _thread; } | |
| 845 void* ucontext() const { return _ucontext; } | |
| 846 private: | |
| 847 Thread* _thread; | |
| 848 void* _ucontext; | |
| 849 }; | |
| 850 | |
| 851 class SuspendedThreadTask { | |
| 852 public: | |
| 853 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} | |
| 854 virtual ~SuspendedThreadTask() {} | |
| 855 void run(); | |
| 856 bool is_done() { return _done; } | |
| 857 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; | |
| 858 protected: | |
| 859 private: | |
| 860 void internal_do_task(); | |
| 861 Thread* _thread; | |
| 862 bool _done; | |
| 863 }; | |
| 864 | |
| 865 #ifndef TARGET_OS_FAMILY_windows | |
| 866 // Suspend/resume support | |
| 867 // Protocol: | |
| 868 // | |
| 869 // a thread starts in SR_RUNNING | |
| 870 // | |
| 871 // SR_RUNNING can go to | |
| 872 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it | |
| 873 // SR_SUSPEND_REQUEST can go to | |
| 874 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) | |
| 875 // * SR_SUSPENDED if the stopped thread receives the signal and switches state | |
| 876 // SR_SUSPENDED can go to | |
| 877 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume | |
| 878 // SR_WAKEUP_REQUEST can go to | |
| 879 // * SR_RUNNING when the stopped thread receives the signal | |
| 880 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) | |
| 881 class SuspendResume { | |
| 882 public: | |
| 883 enum State { | |
| 884 SR_RUNNING, | |
| 885 SR_SUSPEND_REQUEST, | |
| 886 SR_SUSPENDED, | |
| 887 SR_WAKEUP_REQUEST | |
| 888 }; | |
| 889 | |
| 890 private: | |
| 891 volatile State _state; | |
| 892 | |
| 893 private: | |
| 894 /* try to switch state from state "from" to state "to" | |
| 895 * returns the state set after the method is complete | |
| 896 */ | |
| 897 State switch_state(State from, State to); | |
| 898 | |
| 899 public: | |
| 900 SuspendResume() : _state(SR_RUNNING) { } | |
| 901 | |
| 902 State state() const { return _state; } | |
| 903 | |
| 904 State request_suspend() { | |
| 905 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); | |
| 906 } | |
| 907 | |
| 908 State cancel_suspend() { | |
| 909 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); | |
| 910 } | |
| 911 | |
| 912 State suspended() { | |
| 913 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); | |
| 914 } | |
| 915 | |
| 916 State request_wakeup() { | |
| 917 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); | |
| 918 } | |
| 919 | |
| 920 State running() { | |
| 921 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); | |
| 922 } | |
| 923 | |
| 924 bool is_running() const { | |
| 925 return _state == SR_RUNNING; | |
| 926 } | |
| 927 | |
| 928 bool is_suspend_request() const { | |
| 929 return _state == SR_SUSPEND_REQUEST; | |
| 930 } | |
| 931 | |
| 932 bool is_suspended() const { | |
| 933 return _state == SR_SUSPENDED; | |
| 934 } | |
| 935 }; | |
| 936 #endif | |
| 937 | |
| 938 | |
| 0 | 939 protected: |
| 940 static long _rand_seed; // seed for random number generator | |
| 941 static int _processor_count; // number of processors | |
| 942 | |
| 943 static char* format_boot_path(const char* format_string, | |
| 944 const char* home, | |
| 945 int home_len, | |
| 946 char fileSep, | |
| 947 char pathSep); | |
| 948 static bool set_boot_path(char fileSep, char pathSep); | |
| 691 | 949 static char** split_path(const char* path, int* n); |
| 11151 | 950 |
| 0 | 951 }; |
| 952 | |
| 953 // Note that "PAUSE" is almost always used with synchronization | |
| 954 // so arguably we should provide Atomic::SpinPause() instead | |
| 955 // of the global SpinPause() with C linkage. | |
| 956 // It'd also be eligible for inlining on many platforms. | |
| 957 | |
| 11127 | 958 extern "C" int SpinPause(); |
| 1972 | 959 |
| 960 #endif // SHARE_VM_RUNTIME_OS_HPP |