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comparison src/cpu/zero/vm/stack_zero.hpp @ 1379:f9271ff9d324

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6941224: Improved stack overflow handling for Zero Summary: Adding stack overflow checking to Shark brought to light a bunch of deficiencies in Zero's stack overflow code. Reviewed-by: twisti Contributed-by: Gary Benson <gbenson@redhat.com>
author twisti
date Thu, 15 Apr 2010 02:40:12 -0700
parents 354d3184f6b2
children 0c5b3cf3c1f5
comparison
equal deleted inserted replaced
1377:ef74d6d1ac1e 1379:f9271ff9d324
1 /* 1 /*
2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved. 2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * Copyright 2008, 2009 Red Hat, Inc. 3 * Copyright 2008, 2009, 2010 Red Hat, Inc.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 * 5 *
6 * This code is free software; you can redistribute it and/or modify it 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 7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation. 8 * published by the Free Software Foundation.
27 private: 27 private:
28 intptr_t *_base; // the last available word 28 intptr_t *_base; // the last available word
29 intptr_t *_top; // the word past the end of the stack 29 intptr_t *_top; // the word past the end of the stack
30 intptr_t *_sp; // the top word on the stack 30 intptr_t *_sp; // the top word on the stack
31 31
32 private:
33 int _shadow_pages_size; // how much ABI stack must we keep free?
34
32 public: 35 public:
33 ZeroStack() 36 ZeroStack()
34 : _base(NULL), _top(NULL), _sp(NULL) {} 37 : _base(NULL), _top(NULL), _sp(NULL) {
38 _shadow_pages_size = StackShadowPages * os::vm_page_size();
39 }
35 40
36 bool needs_setup() const { 41 bool needs_setup() const {
37 return _base == NULL; 42 return _base == NULL;
38 } 43 }
39 44
78 void *alloc(size_t size) { 83 void *alloc(size_t size) {
79 int count = align_size_up(size, wordSize) >> LogBytesPerWord; 84 int count = align_size_up(size, wordSize) >> LogBytesPerWord;
80 assert(count <= available_words(), "stack overflow"); 85 assert(count <= available_words(), "stack overflow");
81 return _sp -= count; 86 return _sp -= count;
82 } 87 }
88
89 int shadow_pages_size() const {
90 return _shadow_pages_size;
91 }
92
93 public:
94 void overflow_check(int required_words, TRAPS);
95 static void handle_overflow(TRAPS);
83 96
84 public: 97 public:
85 static ByteSize base_offset() { 98 static ByteSize base_offset() {
86 return byte_offset_of(ZeroStack, _base); 99 return byte_offset_of(ZeroStack, _base);
87 } 100 }