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1 /*
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2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * Copyright 2008, 2009, 2010 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 * have any questions.
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23 *
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24 */
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25
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26 class ZeroStack {
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27 private:
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28 intptr_t *_base; // the last available word
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29 intptr_t *_top; // the word past the end of the stack
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30 intptr_t *_sp; // the top word on the stack
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31
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32 private:
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33 int _shadow_pages_size; // how much ABI stack must we keep free?
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34
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35 public:
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36 ZeroStack()
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37 : _base(NULL), _top(NULL), _sp(NULL) {
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38 _shadow_pages_size = StackShadowPages * os::vm_page_size();
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39 }
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40
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41 bool needs_setup() const {
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42 return _base == NULL;
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43 }
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44
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45 void setup(void *mem, size_t size) {
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46 assert(needs_setup(), "already set up");
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47 assert(!(size & WordAlignmentMask), "unaligned");
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48
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49 _base = (intptr_t *) mem;
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50 _top = _base + (size >> LogBytesPerWord);
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51 _sp = _top;
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52 }
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53 void teardown() {
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54 assert(!needs_setup(), "not set up");
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55 assert(_sp == _top, "stuff on stack at teardown");
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56
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57 _base = NULL;
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58 _top = NULL;
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59 _sp = NULL;
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60 }
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61
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62 intptr_t *sp() const {
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63 return _sp;
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64 }
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65 void set_sp(intptr_t *new_sp) {
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66 assert(_top >= new_sp && new_sp >= _base, "bad stack pointer");
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67 _sp = new_sp;
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68 }
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69
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70 int available_words() const {
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71 return _sp - _base;
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72 }
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73
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74 void push(intptr_t value) {
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75 assert(_sp > _base, "stack overflow");
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76 *(--_sp) = value;
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77 }
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78 intptr_t pop() {
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79 assert(_sp < _top, "stack underflow");
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80 return *(_sp++);
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81 }
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82
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83 void *alloc(size_t size) {
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84 int count = align_size_up(size, wordSize) >> LogBytesPerWord;
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85 assert(count <= available_words(), "stack overflow");
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86 return _sp -= count;
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87 }
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88
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89 int shadow_pages_size() const {
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90 return _shadow_pages_size;
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91 }
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92
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93 public:
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94 void overflow_check(int required_words, TRAPS);
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95 static void handle_overflow(TRAPS);
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96
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97 public:
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98 static ByteSize base_offset() {
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99 return byte_offset_of(ZeroStack, _base);
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100 }
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101 static ByteSize top_offset() {
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102 return byte_offset_of(ZeroStack, _top);
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103 }
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104 static ByteSize sp_offset() {
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105 return byte_offset_of(ZeroStack, _sp);
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106 }
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107 };
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108
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109
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110 class EntryFrame;
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111 class InterpreterFrame;
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112 class SharkFrame;
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113 class FakeStubFrame;
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114
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115 //
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116 // | ... |
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117 // +--------------------+ ------------------
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118 // | ... | low addresses
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119 // | frame_type |
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120 // | next_frame | high addresses
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121 // +--------------------+ ------------------
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122 // | ... |
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123
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124 class ZeroFrame {
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125 friend class frame;
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126 friend class ZeroStackPrinter;
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127
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128 protected:
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129 ZeroFrame() {
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130 ShouldNotCallThis();
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131 }
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132
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133 enum Layout {
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134 next_frame_off,
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135 frame_type_off,
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136 jf_header_words
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137 };
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138
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139 enum FrameType {
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140 ENTRY_FRAME = 1,
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141 INTERPRETER_FRAME,
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142 SHARK_FRAME,
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143 FAKE_STUB_FRAME
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144 };
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145
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146 protected:
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147 intptr_t *addr_of_word(int offset) const {
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148 return (intptr_t *) this - offset;
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149 }
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150 intptr_t value_of_word(int offset) const {
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151 return *addr_of_word(offset);
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152 }
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153
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154 public:
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155 ZeroFrame *next() const {
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156 return (ZeroFrame *) value_of_word(next_frame_off);
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157 }
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158
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159 protected:
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160 FrameType type() const {
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161 return (FrameType) value_of_word(frame_type_off);
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162 }
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163
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164 public:
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165 bool is_entry_frame() const {
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166 return type() == ENTRY_FRAME;
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167 }
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168 bool is_interpreter_frame() const {
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169 return type() == INTERPRETER_FRAME;
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170 }
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171 bool is_shark_frame() const {
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172 return type() == SHARK_FRAME;
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173 }
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174 bool is_fake_stub_frame() const {
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175 return type() == FAKE_STUB_FRAME;
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176 }
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177
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178 public:
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179 EntryFrame *as_entry_frame() const {
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180 assert(is_entry_frame(), "should be");
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181 return (EntryFrame *) this;
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182 }
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183 InterpreterFrame *as_interpreter_frame() const {
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184 assert(is_interpreter_frame(), "should be");
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185 return (InterpreterFrame *) this;
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186 }
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187 SharkFrame *as_shark_frame() const {
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188 assert(is_shark_frame(), "should be");
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189 return (SharkFrame *) this;
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190 }
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191 FakeStubFrame *as_fake_stub_frame() const {
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192 assert(is_fake_stub_frame(), "should be");
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193 return (FakeStubFrame *) this;
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194 }
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195
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196 public:
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197 void identify_word(int frame_index,
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198 int offset,
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199 char* fieldbuf,
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200 char* valuebuf,
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201 int buflen) const;
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202
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203 protected:
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204 void identify_vp_word(int frame_index,
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205 intptr_t* addr,
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206 intptr_t* monitor_base,
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207 intptr_t* stack_base,
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208 char* fieldbuf,
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209 int buflen) const;
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210 };
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