1 /* 2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2010 Red Hat, Inc. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "interpreter/interpreterRuntime.hpp" 28 #include "stack_zero.hpp" 29 #include "stack_zero.inline.hpp" 30 31 int ZeroStack::suggest_size(Thread *thread) const { 32 assert(needs_setup(), "already set up"); 33 return align_size_down(abi_stack_available(thread) / 2, wordSize); 34 } 35 36 void ZeroStack::handle_overflow(TRAPS) { 37 JavaThread *thread = (JavaThread *) THREAD; 38 39 // Set up the frame anchor if it isn't already 40 bool has_last_Java_frame = thread->has_last_Java_frame(); 41 if (!has_last_Java_frame) { 42 intptr_t *sp = thread->zero_stack()->sp(); 43 ZeroFrame *frame = thread->top_zero_frame(); 44 while (frame) { 45 if (frame->is_shark_frame()) 46 break; 47 48 if (frame->is_interpreter_frame()) { 49 interpreterState istate = 50 frame->as_interpreter_frame()->interpreter_state(); 51 if (istate->self_link() == istate) 52 break; 53 } 54 55 sp = ((intptr_t *) frame) + 1; 56 frame = frame->next(); 57 } 58 59 if (frame == NULL) 60 fatal("unrecoverable stack overflow"); 61 62 thread->set_last_Java_frame(frame, sp); 63 } 64 65 // Throw the exception 66 switch (thread->thread_state()) { 67 case _thread_in_Java: 68 InterpreterRuntime::throw_StackOverflowError(thread); 69 break; 70 71 case _thread_in_vm: 72 Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__, 73 methodHandle()); 74 break; 75 76 default: 77 ShouldNotReachHere(); 78 } 79 80 // Reset the frame anchor if necessary 81 if (!has_last_Java_frame) 82 thread->reset_last_Java_frame(); 83 } 84 85 #ifndef PRODUCT 86 void ZeroStack::zap(int c) { 87 memset(_base, c, available_words() * wordSize); 88 } 89 #endif // PRODUCT