Mercurial > hg > graal-compiler
view src/os/linux/vm/os_linux.hpp @ 3345:bad7ecd0b6ed
5091921: Sign flip issues in loop optimizer
Summary: Fix integer overflow problem in the code generated by loop optimizer.
Reviewed-by: never
author | kvn |
---|---|
date | Wed, 04 May 2011 13:12:42 -0700 |
parents | 139667d9836a |
children | 7c2653aefc46 |
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/* * Copyright (c) 1999, 2010, 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. * */ #ifndef OS_LINUX_VM_OS_LINUX_HPP #define OS_LINUX_VM_OS_LINUX_HPP // Linux_OS defines the interface to Linux operating systems /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */ typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); class Linux { friend class os; // For signal-chaining #define MAXSIGNUM 32 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions static unsigned int sigs; // mask of signals that have // preinstalled signal handlers static bool libjsig_is_loaded; // libjsig that interposes sigaction(), // __sigaction(), signal() is loaded static struct sigaction *(*get_signal_action)(int); static struct sigaction *get_preinstalled_handler(int); static void save_preinstalled_handler(int, struct sigaction&); static void check_signal_handler(int sig); // For signal flags diagnostics static int sigflags[MAXSIGNUM]; static int (*_clock_gettime)(clockid_t, struct timespec *); static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); static address _initial_thread_stack_bottom; static uintptr_t _initial_thread_stack_size; static const char *_glibc_version; static const char *_libpthread_version; static bool _is_floating_stack; static bool _is_NPTL; static bool _supports_fast_thread_cpu_time; static GrowableArray<int>* _cpu_to_node; protected: static julong _physical_memory; static pthread_t _main_thread; static Mutex* _createThread_lock; static int _page_size; static julong available_memory(); static julong physical_memory() { return _physical_memory; } static void initialize_system_info(); static void set_glibc_version(const char *s) { _glibc_version = s; } static void set_libpthread_version(const char *s) { _libpthread_version = s; } static bool supports_variable_stack_size(); static void set_is_NPTL() { _is_NPTL = true; } static void set_is_LinuxThreads() { _is_NPTL = false; } static void set_is_floating_stack() { _is_floating_stack = true; } static void rebuild_cpu_to_node_map(); static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } static bool hugetlbfs_sanity_check(bool warn, size_t page_size); public: static void init_thread_fpu_state(); static int get_fpu_control_word(); static void set_fpu_control_word(int fpu_control); static pthread_t main_thread(void) { return _main_thread; } // returns kernel thread id (similar to LWP id on Solaris), which can be // used to access /proc static pid_t gettid(); static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } static Mutex* createThread_lock(void) { return _createThread_lock; } static void hotspot_sigmask(Thread* thread); static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } static bool is_initial_thread(void); static int page_size(void) { return _page_size; } static void set_page_size(int val) { _page_size = val; } static address ucontext_get_pc(ucontext_t* uc); static intptr_t* ucontext_get_sp(ucontext_t* uc); static intptr_t* ucontext_get_fp(ucontext_t* uc); // For Analyzer Forte AsyncGetCallTrace profiling support: // // This interface should be declared in os_linux_i486.hpp, but // that file provides extensions to the os class and not the // Linux class. static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp); // This boolean allows users to forward their own non-matching signals // to JVM_handle_linux_signal, harmlessly. static bool signal_handlers_are_installed; static int get_our_sigflags(int); static void set_our_sigflags(int, int); static void signal_sets_init(); static void install_signal_handlers(); static void set_signal_handler(int, bool); static bool is_sig_ignored(int sig); static sigset_t* unblocked_signals(); static sigset_t* vm_signals(); static sigset_t* allowdebug_blocked_signals(); // For signal-chaining static struct sigaction *get_chained_signal_action(int sig); static bool chained_handler(int sig, siginfo_t* siginfo, void* context); // GNU libc and libpthread version strings static const char *glibc_version() { return _glibc_version; } static const char *libpthread_version() { return _libpthread_version; } // NPTL or LinuxThreads? static bool is_LinuxThreads() { return !_is_NPTL; } static bool is_NPTL() { return _is_NPTL; } // NPTL is always floating stack. LinuxThreads could be using floating // stack or fixed stack. static bool is_floating_stack() { return _is_floating_stack; } static void libpthread_init(); static bool libnuma_init(); static void* libnuma_dlsym(void* handle, const char* name); // Minimum stack size a thread can be created with (allowing // the VM to completely create the thread and enter user code) static size_t min_stack_allowed; // Return default stack size or guard size for the specified thread type static size_t default_stack_size(os::ThreadType thr_type); static size_t default_guard_size(os::ThreadType thr_type); static void capture_initial_stack(size_t max_size); // Stack overflow handling static bool manually_expand_stack(JavaThread * t, address addr); static int max_register_window_saves_before_flushing(); // Real-time clock functions static void clock_init(void); // fast POSIX clocks support static void fast_thread_clock_init(void); static bool supports_monotonic_clock() { return _clock_gettime != NULL; } static int clock_gettime(clockid_t clock_id, struct timespec *tp) { return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; } static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; } static bool supports_fast_thread_cpu_time() { return _supports_fast_thread_cpu_time; } static jlong fast_thread_cpu_time(clockid_t clockid); // Stack repair handling // none present // LinuxThreads work-around for 6292965 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); // Linux suspend/resume support - this helper is a shadow of its former // self now that low-level suspension is barely used, and old workarounds // for LinuxThreads are no longer needed. class SuspendResume { private: volatile int _suspend_action; // values for suspend_action: #define SR_NONE (0x00) #define SR_SUSPEND (0x01) // suspend request #define SR_CONTINUE (0x02) // resume request volatile jint _state; // values for _state: + SR_NONE #define SR_SUSPENDED (0x20) public: SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; } int suspend_action() const { return _suspend_action; } void set_suspend_action(int x) { _suspend_action = x; } // atomic updates for _state void set_suspended() { jint temp, temp2; do { temp = _state; temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp); } while (temp2 != temp); } void clear_suspended() { jint temp, temp2; do { temp = _state; temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp); } while (temp2 != temp); } bool is_suspended() { return _state & SR_SUSPENDED; } #undef SR_SUSPENDED }; private: typedef int (*sched_getcpu_func_t)(void); typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); typedef int (*numa_max_node_func_t)(void); typedef int (*numa_available_func_t)(void); typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); static sched_getcpu_func_t _sched_getcpu; static numa_node_to_cpus_func_t _numa_node_to_cpus; static numa_max_node_func_t _numa_max_node; static numa_available_func_t _numa_available; static numa_tonode_memory_func_t _numa_tonode_memory; static numa_interleave_memory_func_t _numa_interleave_memory; static unsigned long* _numa_all_nodes; static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } static void set_numa_available(numa_available_func_t func) { _numa_available = func; } static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } public: static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; } static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } static int numa_tonode_memory(void *start, size_t size, int node) { return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; } static void numa_interleave_memory(void *start, size_t size) { if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { _numa_interleave_memory(start, size, _numa_all_nodes); } } static int get_node_by_cpu(int cpu_id); }; class PlatformEvent : public CHeapObj { private: double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line volatile int _Event ; volatile int _nParked ; pthread_mutex_t _mutex [1] ; pthread_cond_t _cond [1] ; double PostPad [2] ; Thread * _Assoc ; public: // TODO-FIXME: make dtor private ~PlatformEvent() { guarantee (0, "invariant") ; } public: PlatformEvent() { int status; status = pthread_cond_init (_cond, NULL); assert_status(status == 0, status, "cond_init"); status = pthread_mutex_init (_mutex, NULL); assert_status(status == 0, status, "mutex_init"); _Event = 0 ; _nParked = 0 ; _Assoc = NULL ; } // Use caution with reset() and fired() -- they may require MEMBARs void reset() { _Event = 0 ; } int fired() { return _Event; } void park () ; void unpark () ; int TryPark () ; int park (jlong millis) ; void SetAssociation (Thread * a) { _Assoc = a ; } } ; class PlatformParker : public CHeapObj { protected: pthread_mutex_t _mutex [1] ; pthread_cond_t _cond [1] ; public: // TODO-FIXME: make dtor private ~PlatformParker() { guarantee (0, "invariant") ; } public: PlatformParker() { int status; status = pthread_cond_init (_cond, NULL); assert_status(status == 0, status, "cond_init"); status = pthread_mutex_init (_mutex, NULL); assert_status(status == 0, status, "mutex_init"); } } ; #endif // OS_LINUX_VM_OS_LINUX_HPP