Mercurial > hg > graal-compiler
view src/os/posix/vm/os_posix.cpp @ 16396:5c0f2b338874
made -esa apply to Graal classes even if they are not loaded by the boot class loader
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 03 Jul 2014 18:57:20 +0200 |
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(); } } }