2554 _total_args_passed = total_args_passed;
2555 _saved_sig = NEW_C_HEAP_ARRAY(BasicType, _total_args_passed, mtCode);
2556 memcpy(_saved_sig, sig_bt, _total_args_passed * sizeof(BasicType));
2557 }
2558
2559
2560 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) {
2561 if (length != _code_length) {
2562 return false;
2563 }
2564 for (int i = 0; i < length; i++) {
2565 if (buffer[i] != _saved_code[i]) {
2566 return false;
2567 }
2568 }
2569 return true;
2570 }
2571 #endif
2572
2573
2574 // Create a native wrapper for this native method. The wrapper converts the
2575 // java compiled calling convention to the native convention, handlizes
2576 // arguments, and transitions to native. On return from the native we transition
2577 // back to java blocking if a safepoint is in progress.
2578 nmethod *AdapterHandlerLibrary::create_native_wrapper(methodHandle method, int compile_id) {
2579 ResourceMark rm;
2580 nmethod* nm = NULL;
2581
2582 assert(method->is_native(), "must be native");
2583 assert(method->is_method_handle_intrinsic() ||
2584 method->has_native_function(), "must have something valid to call!");
2585
2586 {
2587 // perform the work while holding the lock, but perform any printing outside the lock
2588 MutexLocker mu(AdapterHandlerLibrary_lock);
2589 // See if somebody beat us to it
2590 nm = method->code();
2591 if (nm) {
2592 return nm;
2593 }
2594
2595 ResourceMark rm;
2596
2597 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2598 if (buf != NULL) {
2599 CodeBuffer buffer(buf);
2600 double locs_buf[20];
2601 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2602 MacroAssembler _masm(&buffer);
2603
2604 // Fill in the signature array, for the calling-convention call.
2605 const int total_args_passed = method->size_of_parameters();
2606
2607 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2608 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2609 int i=0;
2610 if( !method->is_static() ) // Pass in receiver first
2611 sig_bt[i++] = T_OBJECT;
2612 SignatureStream ss(method->signature());
2613 for( ; !ss.at_return_type(); ss.next()) {
2614 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2615 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2616 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2617 }
2618 assert(i == total_args_passed, "");
2619 BasicType ret_type = ss.type();
2620
2621 // Now get the compiled-Java layout as input (or output) arguments.
2622 // NOTE: Stubs for compiled entry points of method handle intrinsics
2623 // are just trampolines so the argument registers must be outgoing ones.
2624 const bool is_outgoing = method->is_method_handle_intrinsic();
2625 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2626
2627 // Generate the compiled-to-native wrapper code
2628 nm = SharedRuntime::generate_native_wrapper(&_masm,
2629 method,
2630 compile_id,
2631 sig_bt,
2632 regs,
2633 ret_type);
2634 }
2635 }
2636
2637 // Must unlock before calling set_code
2638
2639 // Install the generated code.
2640 if (nm != NULL) {
2641 if (PrintCompilation) {
2642 ttyLocker ttyl;
2643 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : "");
2644 }
2645 method->set_code(method, nm);
2646 nm->post_compiled_method_load_event();
2647 } else {
2648 // CodeCache is full, disable compilation
2649 CompileBroker::handle_full_code_cache();
2650 }
2651 return nm;
2652 }
2653
2654 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2655 assert(thread == JavaThread::current(), "must be");
2656 // The code is about to enter a JNI lazy critical native method and
2657 // _needs_gc is true, so if this thread is already in a critical
2658 // section then just return, otherwise this thread should block
2659 // until needs_gc has been cleared.
2660 if (thread->in_critical()) {
2661 return;
2662 }
2663 // Lock and unlock a critical section to give the system a chance to block
2664 GC_locker::lock_critical(thread);
2665 GC_locker::unlock_critical(thread);
2666 JRT_END
2667
2668 #ifdef HAVE_DTRACE_H
2669 // Create a dtrace nmethod for this method. The wrapper converts the
2670 // java compiled calling convention to the native convention, makes a dummy call
2671 // (actually nops for the size of the call instruction, which become a trap if
|
2554 _total_args_passed = total_args_passed;
2555 _saved_sig = NEW_C_HEAP_ARRAY(BasicType, _total_args_passed, mtCode);
2556 memcpy(_saved_sig, sig_bt, _total_args_passed * sizeof(BasicType));
2557 }
2558
2559
2560 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) {
2561 if (length != _code_length) {
2562 return false;
2563 }
2564 for (int i = 0; i < length; i++) {
2565 if (buffer[i] != _saved_code[i]) {
2566 return false;
2567 }
2568 }
2569 return true;
2570 }
2571 #endif
2572
2573
2574 /**
2575 * Create a native wrapper for this native method. The wrapper converts the
2576 * Java-compiled calling convention to the native convention, handles
2577 * arguments, and transitions to native. On return from the native we transition
2578 * back to java blocking if a safepoint is in progress.
2579 */
2580 void AdapterHandlerLibrary::create_native_wrapper(methodHandle method) {
2581 ResourceMark rm;
2582 nmethod* nm = NULL;
2583
2584 assert(method->is_native(), "must be native");
2585 assert(method->is_method_handle_intrinsic() ||
2586 method->has_native_function(), "must have something valid to call!");
2587
2588 {
2589 // Perform the work while holding the lock, but perform any printing outside the lock
2590 MutexLocker mu(AdapterHandlerLibrary_lock);
2591 // See if somebody beat us to it
2592 nm = method->code();
2593 if (nm != NULL) {
2594 return;
2595 }
2596
2597 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2598 assert(compile_id > 0, "Must generate native wrapper");
2599
2600
2601 ResourceMark rm;
2602 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2603 if (buf != NULL) {
2604 CodeBuffer buffer(buf);
2605 double locs_buf[20];
2606 buffer.insts()->initialize_shared_locs((relocInfo*)locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2607 MacroAssembler _masm(&buffer);
2608
2609 // Fill in the signature array, for the calling-convention call.
2610 const int total_args_passed = method->size_of_parameters();
2611
2612 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2613 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2614 int i=0;
2615 if( !method->is_static() ) // Pass in receiver first
2616 sig_bt[i++] = T_OBJECT;
2617 SignatureStream ss(method->signature());
2618 for( ; !ss.at_return_type(); ss.next()) {
2619 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
2620 if( ss.type() == T_LONG || ss.type() == T_DOUBLE )
2621 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
2622 }
2623 assert(i == total_args_passed, "");
2624 BasicType ret_type = ss.type();
2625
2626 // Now get the compiled-Java layout as input (or output) arguments.
2627 // NOTE: Stubs for compiled entry points of method handle intrinsics
2628 // are just trampolines so the argument registers must be outgoing ones.
2629 const bool is_outgoing = method->is_method_handle_intrinsic();
2630 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, is_outgoing);
2631
2632 // Generate the compiled-to-native wrapper code
2633 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2634
2635 if (nm != NULL) {
2636 method->set_code(method, nm);
2637 }
2638 }
2639 } // Unlock AdapterHandlerLibrary_lock
2640
2641
2642 // Install the generated code.
2643 if (nm != NULL) {
2644 if (PrintCompilation) {
2645 ttyLocker ttyl;
2646 CompileTask::print_compilation(tty, nm, method->is_static() ? "(static)" : "");
2647 }
2648 nm->post_compiled_method_load_event();
2649 } else {
2650 // CodeCache is full, disable compilation
2651 CompileBroker::handle_full_code_cache();
2652 }
2653 }
2654
2655 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::block_for_jni_critical(JavaThread* thread))
2656 assert(thread == JavaThread::current(), "must be");
2657 // The code is about to enter a JNI lazy critical native method and
2658 // _needs_gc is true, so if this thread is already in a critical
2659 // section then just return, otherwise this thread should block
2660 // until needs_gc has been cleared.
2661 if (thread->in_critical()) {
2662 return;
2663 }
2664 // Lock and unlock a critical section to give the system a chance to block
2665 GC_locker::lock_critical(thread);
2666 GC_locker::unlock_critical(thread);
2667 JRT_END
2668
2669 #ifdef HAVE_DTRACE_H
2670 // Create a dtrace nmethod for this method. The wrapper converts the
2671 // java compiled calling convention to the native convention, makes a dummy call
2672 // (actually nops for the size of the call instruction, which become a trap if
|