jdk8-mips64-public/hotspot: src/share/vm/runtime/javaCalls.cpp@7ee622712fcf (annotated)

src/share/vm/runtime/javaCalls.cpp@7ee622712fcf (annotated)

src/share/vm/runtime/javaCalls.cpp

Tue, 04 Mar 2008 09:44:24 -0500

author: sbohne
date: Tue, 04 Mar 2008 09:44:24 -0500
changeset 493: 7ee622712fcf
parent 435: a61af66fc99e
child 900: dc16daa0329d
permissions: -rw-r--r--

6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
Summary: Enqueue VM_EnableBiasedLocking operation asynchronously
Reviewed-by: never, xlu, kbr, acorn

 /*
  * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_javaCalls.cpp.incl"
 // -----------------------------------------------------
 // Implementation of JavaCallWrapper
 JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) {
   JavaThread* thread = (JavaThread *)THREAD;
   bool clear_pending_exception = true;
   guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
   assert(!thread->owns_locks(), "must release all locks when leaving VM");
   guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler");
   _result   = result;
   // Make sure that that the value of the  higest_lock is at least the same as the current stackpointer,
   // since, the Java code is highly likely to use locks.
   // Use '(address)this' to guarantee that highest_lock address is conservative and inside our thread
   thread->update_highest_lock((address)this);
   // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
   // since it can potentially block.
   JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
   // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
   // info, since we cannot find oops before the new information is set up completely.
   ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
   // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
   // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
   // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
   if (thread->has_special_runtime_exit_condition()) {
     thread->handle_special_runtime_exit_condition();
     if (HAS_PENDING_EXCEPTION) {
       clear_pending_exception = false;
     }
   }
   // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
   // the JavaCallWrapper before the entry frame is on the stack.
   _callee_method = callee_method();
   _receiver = receiver();
 #ifdef CHECK_UNHANDLED_OOPS
   THREAD->allow_unhandled_oop(&_callee_method);
   THREAD->allow_unhandled_oop(&_receiver);
 #endif // CHECK_UNHANDLED_OOPS
   _thread       = (JavaThread *)thread;
   _handles      = _thread->active_handles();    // save previous handle block & Java frame linkage
   // For the profiler, the last_Java_frame information in thread must always be in
   // legal state. We have no last Java frame if last_Java_sp == NULL so
   // the valid transition is to clear _last_Java_sp and then reset the rest of
   // the (platform specific) state.
   _anchor.copy(_thread->frame_anchor());
   _thread->frame_anchor()->clear();
   debug_only(_thread->inc_java_call_counter());
   _thread->set_active_handles(new_handles);     // install new handle block and reset Java frame linkage
   assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
   // clear any pending exception in thread (native calls start with no exception pending)
   if(clear_pending_exception) {
     _thread->clear_pending_exception();
   }
   if (_anchor.last_Java_sp() == NULL) {
     _thread->record_base_of_stack_pointer();
   }
 }
 JavaCallWrapper::~JavaCallWrapper() {
   assert(_thread == JavaThread::current(), "must still be the same thread");
   // restore previous handle block & Java frame linkage
   JNIHandleBlock *_old_handles = _thread->active_handles();
   _thread->set_active_handles(_handles);
   _thread->frame_anchor()->zap();
   debug_only(_thread->dec_java_call_counter());
   if (_anchor.last_Java_sp() == NULL) {
     _thread->set_base_of_stack_pointer(NULL);
   }
   // Old thread-local info. has been restored. We are not back in the VM.
   ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
   // State has been restored now make the anchor frame visible for the profiler.
   // Do this after the transition because this allows us to put an assert
   // the Java->vm transition which checks to see that stack is not walkable
   // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
   // invariants (i.e. _flags always cleared on return to Java)
   _thread->frame_anchor()->copy(&_anchor);
   // Release handles after we are marked as being inside the VM again, since this
   // operation might block
   JNIHandleBlock::release_block(_old_handles, _thread);
 }
 void JavaCallWrapper::oops_do(OopClosure* f) {
   f->do_oop((oop*)&_callee_method);
   f->do_oop((oop*)&_receiver);
   handles()->oops_do(f);
 }
 // Helper methods
 static BasicType runtime_type_from(JavaValue* result) {
   switch (result->get_type()) {
     case T_BOOLEAN: // fall through
     case T_CHAR   : // fall through
     case T_SHORT  : // fall through
     case T_INT    : // fall through
 #ifndef _LP64
     case T_OBJECT : // fall through
     case T_ARRAY  : // fall through
 #endif
     case T_BYTE   : // fall through
     case T_VOID   : return T_INT;
     case T_LONG   : return T_LONG;
     case T_FLOAT  : return T_FLOAT;
     case T_DOUBLE : return T_DOUBLE;
 #ifdef _LP64
     case T_ARRAY  : // fall through
     case T_OBJECT:  return T_OBJECT;
 #endif
   }
   ShouldNotReachHere();
   return T_ILLEGAL;
 }
 // ===== object constructor calls =====
 void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) {
   assert(method->name() == vmSymbols::object_initializer_name(),    "Should only be called for default constructor");
   assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor");
   instanceKlass* ik = instanceKlass::cast(method->method_holder());
   if (ik->is_initialized() && ik->has_vanilla_constructor()) {
     // safe to skip constructor call
   } else {
     static JavaValue result(T_VOID);
     JavaCallArguments args(receiver);
     call(&result, method, &args, CHECK);
   }
 }
 // ============ Virtual calls ============
 void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
   CallInfo callinfo;
   Handle receiver = args->receiver();
   KlassHandle recvrKlass(THREAD, receiver.is_null() ? (klassOop)NULL : receiver->klass());
   LinkResolver::resolve_virtual_call(
           callinfo, receiver, recvrKlass, spec_klass, name, signature,
           KlassHandle(), false, true, CHECK);
   methodHandle method = callinfo.selected_method();
   assert(method.not_null(), "should have thrown exception");
   // Invoke the method
   JavaCalls::call(result, method, args, CHECK);
 }
 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, TRAPS) {
   JavaCallArguments args(receiver); // One oop argument
   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 }
 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
   JavaCallArguments args(receiver); // One oop argument
   args.push_oop(arg1);
   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 }
 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
   JavaCallArguments args(receiver); // One oop argument
   args.push_oop(arg1);
   args.push_oop(arg2);
   call_virtual(result, spec_klass, name, signature, &args, CHECK);
 }
 // ============ Special calls ============
 void JavaCalls::call_special(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
   CallInfo callinfo;
   LinkResolver::resolve_special_call(callinfo, klass, name, signature, KlassHandle(), false, CHECK);
   methodHandle method = callinfo.selected_method();
   assert(method.not_null(), "should have thrown exception");
   // Invoke the method
   JavaCalls::call(result, method, args, CHECK);
 }
 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
   JavaCallArguments args(receiver); // One oop argument
   call_special(result, klass, name, signature, &args, CHECK);
 }
 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
   JavaCallArguments args(receiver); // One oop argument
   args.push_oop(arg1);
   call_special(result, klass, name, signature, &args, CHECK);
 }
 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
   JavaCallArguments args(receiver); // One oop argument
   args.push_oop(arg1);
   args.push_oop(arg2);
   call_special(result, klass, name, signature, &args, CHECK);
 }
 // ============ Static calls ============
 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
   CallInfo callinfo;
   LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK);
   methodHandle method = callinfo.selected_method();
   assert(method.not_null(), "should have thrown exception");
   // Invoke the method
   JavaCalls::call(result, method, args, CHECK);
 }
 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
   JavaCallArguments args; // No argument
   call_static(result, klass, name, signature, &args, CHECK);
 }
 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
   JavaCallArguments args(arg1); // One oop argument
   call_static(result, klass, name, signature, &args, CHECK);
 }
 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
   JavaCallArguments args; // One oop argument
   args.push_oop(arg1);
   args.push_oop(arg2);
   call_static(result, klass, name, signature, &args, CHECK);
 }
 // -------------------------------------------------
 // Implementation of JavaCalls (low level)
 void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) {
   // Check if we need to wrap a potential OS exception handler around thread
   // This is used for e.g. Win32 structured exception handlers
   assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
   // Need to wrap each and everytime, since there might be native code down the
   // stack that has installed its own exception handlers
   os::os_exception_wrapper(call_helper, result, &method, args, THREAD);
 }
 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) {
   methodHandle method = *m;
   JavaThread* thread = (JavaThread*)THREAD;
   assert(thread->is_Java_thread(), "must be called by a java thread");
   assert(method.not_null(), "must have a method to call");
   assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
   assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
   CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
   // Make sure that the arguments have the right type
   debug_only(args->verify(method, result->get_type(), thread));
   // Ignore call if method is empty
   if (method->is_empty_method()) {
     assert(result->get_type() == T_VOID, "an empty method must return a void value");
     return;
   }
 #ifdef ASSERT
   { klassOop holder = method->method_holder();
     // A klass might not be initialized since JavaCall's might be used during the executing of
     // the <clinit>. For example, a Thread.start might start executing on an object that is
     // not fully initialized! (bad Java programming style)
     assert(instanceKlass::cast(holder)->is_linked(), "rewritting must have taken place");
   }
 #endif
   assert(!thread->is_Compiler_thread(), "cannot compile from the compiler");
   if (CompilationPolicy::mustBeCompiled(method)) {
     CompileBroker::compile_method(method, InvocationEntryBci,
                                   methodHandle(), 0, "mustBeCompiled", CHECK);
   }
   // Since the call stub sets up like the interpreter we call the from_interpreted_entry
   // so we can go compiled via a i2c. Otherwise initial entry method will always
   // run interpreted.
   address entry_point = method->from_interpreted_entry();
   if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
     entry_point = method->interpreter_entry();
   }
   // Figure out if the result value is an oop or not (Note: This is a different value
   // than result_type. result_type will be T_INT of oops. (it is about size)
   BasicType result_type = runtime_type_from(result);
   bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
   // NOTE: if we move the computation of the result_val_address inside
   // the call to call_stub, the optimizer produces wrong code.
   intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
   // Find receiver
   Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
   // When we reenter Java, we need to reenable the yellow zone which
   // might already be disabled when we are in VM.
   if (thread->stack_yellow_zone_disabled()) {
     thread->reguard_stack();
   }
   // Check that there are shadow pages available before changing thread state
   // to Java
   if (!os::stack_shadow_pages_available(THREAD, method)) {
     // Throw stack overflow exception with preinitialized exception.
     Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__);
     return;
   } else {
     // Touch pages checked if the OS needs them to be touched to be mapped.
     os::bang_stack_shadow_pages();
   }
   // do call
   { JavaCallWrapper link(method, receiver, result, CHECK);
     { HandleMark hm(thread);  // HandleMark used by HandleMarkCleaner
       StubRoutines::call_stub()(
         (address)&link,
         // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
         result_val_address,          // see NOTE above (compiler problem)
         result_type,
         method(),
         entry_point,
         args->parameters(),
         args->size_of_parameters(),
         CHECK
       );
       result = link.result();  // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
       // Preserve oop return value across possible gc points
       if (oop_result_flag) {
         thread->set_vm_result((oop) result->get_jobject());
       }
     }
   } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
   // Check if a thread stop or suspend should be executed
   // The following assert was not realistic.  Thread.stop can set that bit at any moment.
   //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
   // Restore possible oop return
   if (oop_result_flag) {
     result->set_jobject((jobject)thread->vm_result());
     thread->set_vm_result(NULL);
   }
 }
 //--------------------------------------------------------------------------------------
 // Implementation of JavaCallArguments
 intptr_t* JavaCallArguments::parameters() {
   // First convert all handles to oops
   for(int i = 0; i < _size; i++) {
     if (_is_oop[i]) {
       // Handle conversion
       _value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]);
     }
     // The parameters are moved to the parameters array to include the tags.
     if (TaggedStackInterpreter) {
       // Tags are interspersed with arguments.  Tags are first.
       int tagged_index = i*2;
       _parameters[tagged_index]   = _is_oop[i] ? frame::TagReference :
                                                  frame::TagValue;
       _parameters[tagged_index+1] = _value[i];
     }
   }
   // Return argument vector
   return TaggedStackInterpreter ? _parameters : _value;
 }
 //--------------------------------------------------------------------------------------
 // Non-Product code
 #ifndef PRODUCT
 class SignatureChekker : public SignatureIterator {
  private:
    bool *_is_oop;
    int   _pos;
    BasicType _return_type;
  public:
   bool _is_return;
   SignatureChekker(symbolHandle signature, BasicType return_type, bool is_static, bool* is_oop) : SignatureIterator(signature) {
     _is_oop = is_oop;
     _is_return = false;
     _return_type = return_type;
     _pos = 0;
     if (!is_static) {
       check_value(true); // Receiver must be an oop
     }
   }
   void check_value(bool type) {
     guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments");
   }
   void check_doing_return(bool state) { _is_return = state; }
   void check_return_type(BasicType t) {
     guarantee(_is_return && t == _return_type, "return type does not match");
   }
   void check_int(BasicType t) {
     if (_is_return) {
       check_return_type(t);
       return;
     }
     check_value(false);
   }
   void check_double(BasicType t) { check_long(t); }
   void check_long(BasicType t) {
     if (_is_return) {
       check_return_type(t);
       return;
     }
     check_value(false);
     check_value(false);
   }
   void check_obj(BasicType t) {
     if (_is_return) {
       check_return_type(t);
       return;
     }
     check_value(true);
   }
   void do_bool()                       { check_int(T_BOOLEAN);       }
   void do_char()                       { check_int(T_CHAR);          }
   void do_float()                      { check_int(T_FLOAT);         }
   void do_double()                     { check_double(T_DOUBLE);     }
   void do_byte()                       { check_int(T_BYTE);          }
   void do_short()                      { check_int(T_SHORT);         }
   void do_int()                        { check_int(T_INT);           }
   void do_long()                       { check_long(T_LONG);         }
   void do_void()                       { check_return_type(T_VOID);  }
   void do_object(int begin, int end)   { check_obj(T_OBJECT);        }
   void do_array(int begin, int end)    { check_obj(T_OBJECT);        }
 };
 void JavaCallArguments::verify(methodHandle method, BasicType return_type,
   Thread *thread) {
   guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
   // Treat T_OBJECT and T_ARRAY as the same
   if (return_type == T_ARRAY) return_type = T_OBJECT;
   // Check that oop information is correct
   symbolHandle signature (thread,  method->signature());
   SignatureChekker sc(signature, return_type, method->is_static(),_is_oop);
   sc.iterate_parameters();
   sc.check_doing_return(true);
   sc.iterate_returntype();
 }
 #endif // PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/javaCalls.cpp@7ee622712fcf (annotated)

src/share/vm/runtime/javaCalls.cpp