1 /* 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2008, 2009, 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 #ifndef CPU_ZERO_VM_STACK_ZERO_HPP 27 #define CPU_ZERO_VM_STACK_ZERO_HPP 28 29 #include "utilities/sizes.hpp" 30 31 class ZeroStack { 32 private: 33 intptr_t *_base; // the last available word 34 intptr_t *_top; // the word past the end of the stack 35 intptr_t *_sp; // the top word on the stack 36 37 private: 38 int _shadow_pages_size; // how much ABI stack must we keep free? 39 40 public: ZeroStack()41 ZeroStack() 42 : _base(NULL), _top(NULL), _sp(NULL) { 43 _shadow_pages_size = StackShadowPages * os::vm_page_size(); 44 } 45 needs_setup() const46 bool needs_setup() const { 47 return _base == NULL; 48 } 49 50 int suggest_size(Thread *thread) const; 51 setup(void * mem,size_t size)52 void setup(void *mem, size_t size) { 53 assert(needs_setup(), "already set up"); 54 assert(!(size & WordAlignmentMask), "unaligned"); 55 56 _base = (intptr_t *) mem; 57 _top = _base + (size >> LogBytesPerWord); 58 _sp = _top; 59 } teardown()60 void teardown() { 61 assert(!needs_setup(), "not set up"); 62 assert(_sp == _top, "stuff on stack at teardown"); 63 64 _base = NULL; 65 _top = NULL; 66 _sp = NULL; 67 } 68 sp() const69 intptr_t *sp() const { 70 return _sp; 71 } set_sp(intptr_t * new_sp)72 void set_sp(intptr_t *new_sp) { 73 assert(_top >= new_sp && new_sp >= _base, "bad stack pointer"); 74 _sp = new_sp; 75 } 76 total_words() const77 int total_words() const { 78 return _top - _base; 79 } available_words() const80 int available_words() const { 81 return _sp - _base; 82 } 83 push(intptr_t value)84 void push(intptr_t value) { 85 assert(_sp > _base, "stack overflow"); 86 *(--_sp) = value; 87 } pop()88 intptr_t pop() { 89 assert(_sp < _top, "stack underflow"); 90 return *(_sp++); 91 } 92 alloc(size_t size)93 void *alloc(size_t size) { 94 int count = align_size_up(size, wordSize) >> LogBytesPerWord; 95 assert(count <= available_words(), "stack overflow"); 96 return _sp -= count; 97 } 98 shadow_pages_size() const99 int shadow_pages_size() const { 100 return _shadow_pages_size; 101 } 102 int abi_stack_available(Thread *thread) const; 103 104 public: 105 void overflow_check(int required_words, TRAPS); 106 static void handle_overflow(TRAPS); 107 108 public: 109 void zap(int c) PRODUCT_RETURN; 110 111 public: base_offset()112 static ByteSize base_offset() { 113 return byte_offset_of(ZeroStack, _base); 114 } top_offset()115 static ByteSize top_offset() { 116 return byte_offset_of(ZeroStack, _top); 117 } sp_offset()118 static ByteSize sp_offset() { 119 return byte_offset_of(ZeroStack, _sp); 120 } 121 }; 122 123 124 class EntryFrame; 125 class InterpreterFrame; 126 class SharkFrame; 127 class FakeStubFrame; 128 129 // 130 // | ... | 131 // +--------------------+ ------------------ 132 // | ... | low addresses 133 // | frame_type | 134 // | next_frame | high addresses 135 // +--------------------+ ------------------ 136 // | ... | 137 138 class ZeroFrame { 139 friend class frame; 140 friend class ZeroStackPrinter; 141 142 protected: ZeroFrame()143 ZeroFrame() { 144 ShouldNotCallThis(); 145 } 146 147 enum Layout { 148 next_frame_off, 149 frame_type_off, 150 jf_header_words 151 }; 152 153 enum FrameType { 154 ENTRY_FRAME = 1, 155 INTERPRETER_FRAME, 156 SHARK_FRAME, 157 FAKE_STUB_FRAME 158 }; 159 160 protected: addr_of_word(int offset) const161 intptr_t *addr_of_word(int offset) const { 162 return (intptr_t *) this - offset; 163 } value_of_word(int offset) const164 intptr_t value_of_word(int offset) const { 165 return *addr_of_word(offset); 166 } 167 168 public: next() const169 ZeroFrame *next() const { 170 return (ZeroFrame *) value_of_word(next_frame_off); 171 } 172 173 protected: type() const174 FrameType type() const { 175 return (FrameType) value_of_word(frame_type_off); 176 } 177 178 public: is_entry_frame() const179 bool is_entry_frame() const { 180 return type() == ENTRY_FRAME; 181 } is_interpreter_frame() const182 bool is_interpreter_frame() const { 183 return type() == INTERPRETER_FRAME; 184 } is_shark_frame() const185 bool is_shark_frame() const { 186 return type() == SHARK_FRAME; 187 } is_fake_stub_frame() const188 bool is_fake_stub_frame() const { 189 return type() == FAKE_STUB_FRAME; 190 } 191 192 public: as_entry_frame() const193 EntryFrame *as_entry_frame() const { 194 assert(is_entry_frame(), "should be"); 195 return (EntryFrame *) this; 196 } as_interpreter_frame() const197 InterpreterFrame *as_interpreter_frame() const { 198 assert(is_interpreter_frame(), "should be"); 199 return (InterpreterFrame *) this; 200 } as_shark_frame() const201 SharkFrame *as_shark_frame() const { 202 assert(is_shark_frame(), "should be"); 203 return (SharkFrame *) this; 204 } as_fake_stub_frame() const205 FakeStubFrame *as_fake_stub_frame() const { 206 assert(is_fake_stub_frame(), "should be"); 207 return (FakeStubFrame *) this; 208 } 209 210 public: 211 void identify_word(int frame_index, 212 int offset, 213 char* fieldbuf, 214 char* valuebuf, 215 int buflen) const; 216 217 protected: 218 void identify_vp_word(int frame_index, 219 intptr_t* addr, 220 intptr_t* monitor_base, 221 intptr_t* stack_base, 222 char* fieldbuf, 223 int buflen) const; 224 }; 225 226 #endif // CPU_ZERO_VM_STACK_ZERO_HPP 227