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1010
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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 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 public:
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33 ZeroStack()
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34 : _base(NULL), _top(NULL), _sp(NULL) {}
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35
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36 bool needs_setup() const {
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37 return _base == NULL;
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38 }
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39
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40 void setup(void *mem, size_t size) {
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41 assert(needs_setup(), "already set up");
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42 assert(!(size & WordAlignmentMask), "unaligned");
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43
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44 _base = (intptr_t *) mem;
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45 _top = _base + (size >> LogBytesPerWord);
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46 _sp = _top;
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47 }
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48 void teardown() {
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49 assert(!needs_setup(), "not set up");
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50 assert(_sp == _top, "stuff on stack at teardown");
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51
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52 _base = NULL;
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53 _top = NULL;
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54 _sp = NULL;
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55 }
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56
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57 intptr_t *sp() const {
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58 return _sp;
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59 }
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60 void set_sp(intptr_t *new_sp) {
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61 assert(_top >= new_sp && new_sp >= _base, "bad stack pointer");
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62 _sp = new_sp;
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63 }
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64
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65 int available_words() const {
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66 return _sp - _base;
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67 }
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68
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69 void push(intptr_t value) {
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70 assert(_sp > _base, "stack overflow");
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71 *(--_sp) = value;
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72 }
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73 intptr_t pop() {
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74 assert(_sp < _top, "stack underflow");
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75 return *(_sp++);
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76 }
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77
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78 void *alloc(size_t size) {
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79 int count = align_size_up(size, wordSize) >> LogBytesPerWord;
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80 assert(count <= available_words(), "stack overflow");
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81 return _sp -= count;
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82 }
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83
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84 public:
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85 static ByteSize base_offset() {
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86 return byte_offset_of(ZeroStack, _base);
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87 }
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88 static ByteSize top_offset() {
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89 return byte_offset_of(ZeroStack, _top);
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90 }
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91 static ByteSize sp_offset() {
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92 return byte_offset_of(ZeroStack, _sp);
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93 }
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94 };
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95
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96
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97 class EntryFrame;
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98 class InterpreterFrame;
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99 class SharkFrame;
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100 class FakeStubFrame;
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101
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102 //
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103 // | ... |
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104 // +--------------------+ ------------------
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105 // | ... | low addresses
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106 // | frame_type |
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107 // | next_frame | high addresses
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108 // +--------------------+ ------------------
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109 // | ... |
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110
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111 class ZeroFrame {
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112 friend class frame;
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113 friend class ZeroStackPrinter;
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114
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115 protected:
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116 ZeroFrame() {
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117 ShouldNotCallThis();
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118 }
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119
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120 enum Layout {
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121 next_frame_off,
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122 frame_type_off,
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123 jf_header_words
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124 };
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125
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126 enum FrameType {
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127 ENTRY_FRAME = 1,
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128 INTERPRETER_FRAME,
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129 SHARK_FRAME,
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130 FAKE_STUB_FRAME
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131 };
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132
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133 protected:
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134 intptr_t *addr_of_word(int offset) const {
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135 return (intptr_t *) this - offset;
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136 }
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137 intptr_t value_of_word(int offset) const {
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138 return *addr_of_word(offset);
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139 }
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140
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141 public:
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142 ZeroFrame *next() const {
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143 return (ZeroFrame *) value_of_word(next_frame_off);
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144 }
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145
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146 protected:
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147 FrameType type() const {
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148 return (FrameType) value_of_word(frame_type_off);
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149 }
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150
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151 public:
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152 bool is_entry_frame() const {
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153 return type() == ENTRY_FRAME;
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154 }
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155 bool is_interpreter_frame() const {
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156 return type() == INTERPRETER_FRAME;
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157 }
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158 bool is_shark_frame() const {
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159 return type() == SHARK_FRAME;
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160 }
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161 bool is_fake_stub_frame() const {
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162 return type() == FAKE_STUB_FRAME;
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163 }
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164
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165 public:
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166 EntryFrame *as_entry_frame() const {
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167 assert(is_entry_frame(), "should be");
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168 return (EntryFrame *) this;
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169 }
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170 InterpreterFrame *as_interpreter_frame() const {
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171 assert(is_interpreter_frame(), "should be");
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172 return (InterpreterFrame *) this;
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173 }
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174 SharkFrame *as_shark_frame() const {
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175 assert(is_shark_frame(), "should be");
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176 return (SharkFrame *) this;
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177 }
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178 FakeStubFrame *as_fake_stub_frame() const {
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179 assert(is_fake_stub_frame(), "should be");
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180 return (FakeStubFrame *) this;
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181 }
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182
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183 public:
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184 void identify_word(int frame_index,
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185 int offset,
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186 char* fieldbuf,
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187 char* valuebuf,
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188 int buflen) const;
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189
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190 protected:
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191 void identify_vp_word(int frame_index,
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192 intptr_t* addr,
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193 intptr_t* monitor_base,
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194 intptr_t* stack_base,
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195 char* fieldbuf,
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196 int buflen) const;
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197 };
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