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