1 /* 2 * Copyright (c) 2003, 2016, 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/align.hpp" 30 #include "utilities/sizes.hpp" 31 32 class ZeroStack { 33 private: 34 intptr_t *_base; // the last available word 35 intptr_t *_top; // the word past the end of the stack 36 intptr_t *_sp; // the top word on the stack 37 38 private: 39 int _shadow_pages_size; // how much ABI stack must we keep free? 40 41 public: 42 ZeroStack(); 43 needs_setup() const44 bool needs_setup() const { 45 return _base == NULL; 46 } 47 48 int suggest_size(Thread *thread) const; 49 setup(void * mem,size_t size)50 void setup(void *mem, size_t size) { 51 assert(needs_setup(), "already set up"); 52 assert(!(size & WordAlignmentMask), "unaligned"); 53 54 _base = (intptr_t *) mem; 55 _top = _base + (size >> LogBytesPerWord); 56 _sp = _top; 57 } teardown()58 void teardown() { 59 assert(!needs_setup(), "not set up"); 60 assert(_sp == _top, "stuff on stack at teardown"); 61 62 _base = NULL; 63 _top = NULL; 64 _sp = NULL; 65 } 66 sp() const67 intptr_t *sp() const { 68 return _sp; 69 } set_sp(intptr_t * new_sp)70 void set_sp(intptr_t *new_sp) { 71 assert(_top >= new_sp && new_sp >= _base, "bad stack pointer"); 72 _sp = new_sp; 73 } 74 total_words() const75 int total_words() const { 76 return _top - _base; 77 } available_words() const78 int available_words() const { 79 return _sp - _base; 80 } 81 push(intptr_t value)82 void push(intptr_t value) { 83 assert(_sp > _base, "stack overflow"); 84 *(--_sp) = value; 85 } pop()86 intptr_t pop() { 87 assert(_sp < _top, "stack underflow"); 88 return *(_sp++); 89 } 90 alloc(size_t size)91 void *alloc(size_t size) { 92 int count = align_up(size, wordSize) >> LogBytesPerWord; 93 assert(count <= available_words(), "stack overflow"); 94 return _sp -= count; 95 } 96 shadow_pages_size() const97 int shadow_pages_size() const { 98 return _shadow_pages_size; 99 } 100 int abi_stack_available(Thread *thread) const; 101 102 public: 103 void overflow_check(int required_words, TRAPS); 104 static void handle_overflow(TRAPS); 105 106 public: 107 void zap(int c) PRODUCT_RETURN; 108 109 public: base_offset()110 static ByteSize base_offset() { 111 return byte_offset_of(ZeroStack, _base); 112 } top_offset()113 static ByteSize top_offset() { 114 return byte_offset_of(ZeroStack, _top); 115 } sp_offset()116 static ByteSize sp_offset() { 117 return byte_offset_of(ZeroStack, _sp); 118 } 119 }; 120 121 122 class EntryFrame; 123 class InterpreterFrame; 124 class FakeStubFrame; 125 126 // 127 // | ... | 128 // +--------------------+ ------------------ 129 // | ... | low addresses 130 // | frame_type | 131 // | next_frame | high addresses 132 // +--------------------+ ------------------ 133 // | ... | 134 135 class ZeroFrame { 136 friend class frame; 137 friend class ZeroStackPrinter; 138 139 protected: ZeroFrame()140 ZeroFrame() { 141 ShouldNotCallThis(); 142 } 143 144 enum Layout { 145 next_frame_off, 146 frame_type_off, 147 jf_header_words 148 }; 149 150 enum FrameType { 151 ENTRY_FRAME = 1, 152 INTERPRETER_FRAME, 153 FAKE_STUB_FRAME 154 }; 155 156 protected: addr_of_word(int offset) const157 intptr_t *addr_of_word(int offset) const { 158 return (intptr_t *) this - offset; 159 } value_of_word(int offset) const160 intptr_t value_of_word(int offset) const { 161 return *addr_of_word(offset); 162 } 163 164 public: next() const165 ZeroFrame *next() const { 166 return (ZeroFrame *) value_of_word(next_frame_off); 167 } 168 169 protected: type() const170 FrameType type() const { 171 return (FrameType) value_of_word(frame_type_off); 172 } 173 174 public: is_entry_frame() const175 bool is_entry_frame() const { 176 return type() == ENTRY_FRAME; 177 } is_interpreter_frame() const178 bool is_interpreter_frame() const { 179 return type() == INTERPRETER_FRAME; 180 } is_fake_stub_frame() const181 bool is_fake_stub_frame() const { 182 return type() == FAKE_STUB_FRAME; 183 } 184 185 public: as_entry_frame() const186 EntryFrame *as_entry_frame() const { 187 assert(is_entry_frame(), "should be"); 188 return (EntryFrame *) this; 189 } as_interpreter_frame() const190 InterpreterFrame *as_interpreter_frame() const { 191 assert(is_interpreter_frame(), "should be"); 192 return (InterpreterFrame *) this; 193 } as_fake_stub_frame() const194 FakeStubFrame *as_fake_stub_frame() const { 195 assert(is_fake_stub_frame(), "should be"); 196 return (FakeStubFrame *) this; 197 } 198 199 public: 200 void identify_word(int frame_index, 201 int offset, 202 char* fieldbuf, 203 char* valuebuf, 204 int buflen) const; 205 206 protected: 207 void identify_vp_word(int frame_index, 208 intptr_t* addr, 209 intptr_t* monitor_base, 210 intptr_t* stack_base, 211 char* fieldbuf, 212 int buflen) const; 213 }; 214 215 #endif // CPU_ZERO_VM_STACK_ZERO_HPP 216