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 int abi_available = abi_stack_available(thread); 34 assert(abi_available >= 0, "available abi stack must be >= 0"); 35 return align_size_down(abi_available / 2, wordSize); 36 } 37 38 void ZeroStack::handle_overflow(TRAPS) { 39 JavaThread *thread = (JavaThread *) THREAD; 40 41 // Set up the frame anchor if it isn't already 42 bool has_last_Java_frame = thread->has_last_Java_frame(); 43 if (!has_last_Java_frame) { 44 intptr_t *sp = thread->zero_stack()->sp(); 45 ZeroFrame *frame = thread->top_zero_frame(); 46 while (frame) { 47 if (frame->is_shark_frame()) 48 break; 49 50 if (frame->is_interpreter_frame()) { 51 interpreterState istate = 52 frame->as_interpreter_frame()->interpreter_state(); 53 if (istate->self_link() == istate) 54 break; 55 } 56 57 sp = ((intptr_t *) frame) + 1; 58 frame = frame->next(); 59 } 60 61 if (frame == NULL) 62 fatal("unrecoverable stack overflow"); 63 64 thread->set_last_Java_frame(frame, sp); 65 } 66 67 // Throw the exception 68 switch (thread->thread_state()) { 69 case _thread_in_Java: 70 InterpreterRuntime::throw_StackOverflowError(thread); 71 break; 72 73 case _thread_in_vm: 74 Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__, 75 methodHandle()); 76 break; 77 78 default: 79 ShouldNotReachHere(); 80 } 81 82 // Reset the frame anchor if necessary 83 if (!has_last_Java_frame) 84 thread->reset_last_Java_frame(); 85 } 86 87 #ifndef PRODUCT 88 void ZeroStack::zap(int c) { 89 memset(_base, c, available_words() * wordSize); 90 } 91 #endif // PRODUCT