Mercurial > hg > truffle
view src/os/posix/vm/os_posix.cpp @ 16524:a08a58d0736b
[SPARC] Emit compareAndSwap for AtomicInteger and AtomicLong, Removing o7 register from usable ones, as this register is always overwritten, when using Call or JumpAndLink instructions in SPARC, even callee does not overwrite explicitly, implicit exception is defined when doing integer division, parameter constraint narrowed to only register on Unary2Op, Fix SPARCTestOp, as it did a compare instead of an and with condition codes
author | Stefan Anzinger <stefan.anzinger@gmail.com> |
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date | Tue, 15 Jul 2014 19:07:29 -0700 |
parents | 4ca6dc0799b6 |
children | 52b4284cb496 |
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/* * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "prims/jvm.h" #include "runtime/frame.inline.hpp" #include "runtime/os.hpp" #include "utilities/vmError.hpp" #include <unistd.h> #include <sys/resource.h> #include <sys/utsname.h> #include <pthread.h> #include <signal.h> // Check core dump limit and report possible place where core can be found void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { int n; struct rlimit rlim; bool success; n = get_core_path(buffer, bufferSize); if (getrlimit(RLIMIT_CORE, &rlim) != 0) { jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); success = true; } else { switch(rlim.rlim_cur) { case RLIM_INFINITY: jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); success = true; break; case 0: jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); success = false; break; default: jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10)); success = true; break; } } VMError::report_coredump_status(buffer, success); } address os::get_caller_pc(int n) { #ifdef _NMT_NOINLINE_ n ++; #endif frame fr = os::current_frame(); while (n > 0 && fr.pc() && !os::is_first_C_frame(&fr) && fr.sender_pc()) { fr = os::get_sender_for_C_frame(&fr); n --; } if (n == 0) { return fr.pc(); } else { return NULL; } } int os::get_last_error() { return errno; } bool os::is_debugger_attached() { // not implemented return false; } void os::wait_for_keypress_at_exit(void) { // don't do anything on posix platforms return; } // Multiple threads can race in this code, and can remap over each other with MAP_FIXED, // so on posix, unmap the section at the start and at the end of the chunk that we mapped // rather than unmapping and remapping the whole chunk to get requested alignment. char* os::reserve_memory_aligned(size_t size, size_t alignment) { assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, "Alignment must be a multiple of allocation granularity (page size)"); assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); size_t extra_size = size + alignment; assert(extra_size >= size, "overflow, size is too large to allow alignment"); char* extra_base = os::reserve_memory(extra_size, NULL, alignment); if (extra_base == NULL) { return NULL; } // Do manual alignment char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); // [ | | ] // ^ extra_base // ^ extra_base + begin_offset == aligned_base // extra_base + begin_offset + size ^ // extra_base + extra_size ^ // |<>| == begin_offset // end_offset == |<>| size_t begin_offset = aligned_base - extra_base; size_t end_offset = (extra_base + extra_size) - (aligned_base + size); if (begin_offset > 0) { os::release_memory(extra_base, begin_offset); } if (end_offset > 0) { os::release_memory(extra_base + begin_offset + size, end_offset); } return aligned_base; } void os::Posix::print_load_average(outputStream* st) { st->print("load average:"); double loadavg[3]; os::loadavg(loadavg, 3); st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); st->cr(); } void os::Posix::print_rlimit_info(outputStream* st) { st->print("rlimit:"); struct rlimit rlim; st->print(" STACK "); getrlimit(RLIMIT_STACK, &rlim); if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); else st->print("%uk", rlim.rlim_cur >> 10); st->print(", CORE "); getrlimit(RLIMIT_CORE, &rlim); if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); else st->print("%uk", rlim.rlim_cur >> 10); //Isn't there on solaris #ifndef TARGET_OS_FAMILY_solaris st->print(", NPROC "); getrlimit(RLIMIT_NPROC, &rlim); if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); else st->print("%d", rlim.rlim_cur); #endif st->print(", NOFILE "); getrlimit(RLIMIT_NOFILE, &rlim); if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); else st->print("%d", rlim.rlim_cur); st->print(", AS "); getrlimit(RLIMIT_AS, &rlim); if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); else st->print("%uk", rlim.rlim_cur >> 10); st->cr(); } void os::Posix::print_uname_info(outputStream* st) { // kernel st->print("uname:"); struct utsname name; uname(&name); st->print(name.sysname); st->print(" "); st->print(name.release); st->print(" "); st->print(name.version); st->print(" "); st->print(name.machine); st->cr(); } bool os::has_allocatable_memory_limit(julong* limit) { struct rlimit rlim; int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); // if there was an error when calling getrlimit, assume that there is no limitation // on virtual memory. bool result; if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { result = false; } else { *limit = (julong)rlim.rlim_cur; result = true; } #ifdef _LP64 return result; #else // arbitrary virtual space limit for 32 bit Unices found by testing. If // getrlimit above returned a limit, bound it with this limit. Otherwise // directly use it. const julong max_virtual_limit = (julong)3800*M; if (result) { *limit = MIN2(*limit, max_virtual_limit); } else { *limit = max_virtual_limit; } // bound by actually allocatable memory. The algorithm uses two bounds, an // upper and a lower limit. The upper limit is the current highest amount of // memory that could not be allocated, the lower limit is the current highest // amount of memory that could be allocated. // The algorithm iteratively refines the result by halving the difference // between these limits, updating either the upper limit (if that value could // not be allocated) or the lower limit (if the that value could be allocated) // until the difference between these limits is "small". // the minimum amount of memory we care about allocating. const julong min_allocation_size = M; julong upper_limit = *limit; // first check a few trivial cases if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { *limit = upper_limit; } else if (!is_allocatable(min_allocation_size)) { // we found that not even min_allocation_size is allocatable. Return it // anyway. There is no point to search for a better value any more. *limit = min_allocation_size; } else { // perform the binary search. julong lower_limit = min_allocation_size; while ((upper_limit - lower_limit) > min_allocation_size) { julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; temp_limit = align_size_down_(temp_limit, min_allocation_size); if (is_allocatable(temp_limit)) { lower_limit = temp_limit; } else { upper_limit = temp_limit; } } *limit = lower_limit; } return true; #endif } const char* os::get_current_directory(char *buf, size_t buflen) { return getcwd(buf, buflen); } FILE* os::open(int fd, const char* mode) { return ::fdopen(fd, mode); } void* os::get_default_process_handle() { return (void*)::dlopen(NULL, RTLD_LAZY); } // Builds a platform dependent Agent_OnLoad_<lib_name> function name // which is used to find statically linked in agents. // Parameters: // sym_name: Symbol in library we are looking for // lib_name: Name of library to look in, NULL for shared libs. // is_absolute_path == true if lib_name is absolute path to agent // such as "/a/b/libL.so" // == false if only the base name of the library is passed in // such as "L" char* os::build_agent_function_name(const char *sym_name, const char *lib_name, bool is_absolute_path) { char *agent_entry_name; size_t len; size_t name_len; size_t prefix_len = strlen(JNI_LIB_PREFIX); size_t suffix_len = strlen(JNI_LIB_SUFFIX); const char *start; if (lib_name != NULL) { len = name_len = strlen(lib_name); if (is_absolute_path) { // Need to strip path, prefix and suffix if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { lib_name = ++start; } if (len <= (prefix_len + suffix_len)) { return NULL; } lib_name += prefix_len; name_len = strlen(lib_name) - suffix_len; } } len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); if (agent_entry_name == NULL) { return NULL; } strcpy(agent_entry_name, sym_name); if (lib_name != NULL) { strcat(agent_entry_name, "_"); strncat(agent_entry_name, lib_name, name_len); } return agent_entry_name; } os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); } /* * See the caveats for this class in os_posix.hpp * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this * method and returns false. If none of the signals are raised, returns true. * The callback is supposed to provide the method that should be protected. */ bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { sigset_t saved_sig_mask; assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); assert(!WatcherThread::watcher_thread()->has_crash_protection(), "crash_protection already set?"); // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask // since on at least some systems (OS X) siglongjmp will restore the mask // for the process, not the thread pthread_sigmask(0, NULL, &saved_sig_mask); if (sigsetjmp(_jmpbuf, 0) == 0) { // make sure we can see in the signal handler that we have crash protection // installed WatcherThread::watcher_thread()->set_crash_protection(this); cb.call(); // and clear the crash protection WatcherThread::watcher_thread()->set_crash_protection(NULL); return true; } // this happens when we siglongjmp() back pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); WatcherThread::watcher_thread()->set_crash_protection(NULL); return false; } void os::WatcherThreadCrashProtection::restore() { assert(WatcherThread::watcher_thread()->has_crash_protection(), "must have crash protection"); siglongjmp(_jmpbuf, 1); } void os::WatcherThreadCrashProtection::check_crash_protection(int sig, Thread* thread) { if (thread != NULL && thread->is_Watcher_thread() && WatcherThread::watcher_thread()->has_crash_protection()) { if (sig == SIGSEGV || sig == SIGBUS) { WatcherThread::watcher_thread()->crash_protection()->restore(); } } }