0
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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 typedef class BytecodeInterpreter* interpreterState;
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26
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27 class CodeBlob;
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28
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29
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30 // A frame represents a physical stack frame (an activation). Frames
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31 // can be C or Java frames, and the Java frames can be interpreted or
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32 // compiled. In contrast, vframes represent source-level activations,
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33 // so that one physical frame can correspond to multiple source level
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34 // frames because of inlining.
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35
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36 class frame VALUE_OBJ_CLASS_SPEC {
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37 private:
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38 // Instance variables:
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39 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp)
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40 address _pc; // program counter (the next instruction after the call)
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41
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42 CodeBlob* _cb; // CodeBlob that "owns" pc
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43 enum deopt_state {
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44 not_deoptimized,
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45 is_deoptimized,
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46 unknown
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47 };
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48
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49 deopt_state _deopt_state;
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50
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51 public:
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52 // Constructors
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53 frame();
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54
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55 // Accessors
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56
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57 // pc: Returns the pc at which this frame will continue normally.
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58 // It must point at the beginning of the next instruction to execute.
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59 address pc() const { return _pc; }
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60
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61 // This returns the pc that if you were in the debugger you'd see. Not
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62 // the idealized value in the frame object. This undoes the magic conversion
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63 // that happens for deoptimized frames. In addition it makes the value the
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64 // hardware would want to see in the native frame. The only user (at this point)
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65 // is deoptimization. It likely no one else should ever use it.
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66 address raw_pc() const;
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67
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68 void set_pc( address newpc );
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69
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70 intptr_t* sp() const { return _sp; }
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71 void set_sp( intptr_t* newsp ) { _sp = newsp; }
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72
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73
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74 CodeBlob* cb() const { return _cb; }
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75
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76 // patching operations
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77 void patch_pc(Thread* thread, address pc);
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78
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79 // Every frame needs to return a unique id which distinguishes it from all other frames.
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80 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames
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81 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame
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82 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame.
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83 // We also have relationals which allow comparing a frame to anoth frame's id() allow
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84 // us to distinguish younger (more recent activation) from older (less recent activations)
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85 // A NULL id is only valid when comparing for equality.
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86
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87 intptr_t* id(void) const;
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88 bool is_younger(intptr_t* id) const;
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89 bool is_older(intptr_t* id) const;
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90
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91 // testers
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92
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93 // Compares for strict equality. Rarely used or needed.
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94 // It can return a different result than f1.id() == f2.id()
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95 bool equal(frame other) const;
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96
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97 // type testers
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98 bool is_interpreted_frame() const;
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99 bool is_java_frame() const;
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100 bool is_entry_frame() const; // Java frame called from C?
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101 bool is_native_frame() const;
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102 bool is_runtime_frame() const;
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103 bool is_compiled_frame() const;
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104 bool is_safepoint_blob_frame() const;
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105 bool is_deoptimized_frame() const;
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106
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107 // testers
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108 bool is_first_frame() const; // oldest frame? (has no sender)
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109 bool is_first_java_frame() const; // same for Java frame
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110
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111 bool is_interpreted_frame_valid() const; // performs sanity checks on interpreted frames.
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112
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113 // tells whether this frame is marked for deoptimization
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114 bool should_be_deoptimized() const;
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115
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116 // tells whether this frame can be deoptimized
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117 bool can_be_deoptimized() const;
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118
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119 // returns the frame size in stack slots
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120 int frame_size() const;
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121
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122 // returns the sending frame
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123 frame sender(RegisterMap* map) const;
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124
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125 // for Profiling - acting on another frame. walks sender frames
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126 // if valid.
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127 frame profile_find_Java_sender_frame(JavaThread *thread);
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128 bool safe_for_sender(JavaThread *thread);
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129
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130 // returns the sender, but skips conversion frames
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131 frame real_sender(RegisterMap* map) const;
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132
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133 // returns the the sending Java frame, skipping any intermediate C frames
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134 // NB: receiver must not be first frame
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135 frame java_sender() const;
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136
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137 private:
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138 // Helper methods for better factored code in frame::sender
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139 frame sender_for_compiled_frame(RegisterMap* map) const;
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140 frame sender_for_entry_frame(RegisterMap* map) const;
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141 frame sender_for_interpreter_frame(RegisterMap* map) const;
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142 frame sender_for_native_frame(RegisterMap* map) const;
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143
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144 // All frames:
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145
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146 // A low-level interface for vframes:
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147
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148 public:
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149
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150 intptr_t* addr_at(int index) const { return &fp()[index]; }
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151 intptr_t at(int index) const { return *addr_at(index); }
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152
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153 // accessors for locals
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154 oop obj_at(int offset) const { return *obj_at_addr(offset); }
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155 void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; }
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156
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157 jint int_at(int offset) const { return *int_at_addr(offset); }
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158 void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; }
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159
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160 oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); }
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161
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162 oop* adjusted_obj_at_addr(methodOop method, int index) { return obj_at_addr(adjust_offset(method, index)); }
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163
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164 private:
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165 jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); }
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166
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167 public:
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168 // Link (i.e., the pointer to the previous frame)
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169 intptr_t* link() const;
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170 void set_link(intptr_t* addr);
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171
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172 // Return address
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173 address sender_pc() const;
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174
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175 // Support for deoptimization
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176 void deoptimize(JavaThread* thread, bool thread_is_known_safe = false);
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177
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178 // The frame's original SP, before any extension by an interpreted callee;
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179 // used for packing debug info into vframeArray objects and vframeArray lookup.
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180 intptr_t* unextended_sp() const;
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181
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182 // returns the stack pointer of the calling frame
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183 intptr_t* sender_sp() const;
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184
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185
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186 // Interpreter frames:
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187
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188 private:
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189 intptr_t** interpreter_frame_locals_addr() const;
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190 intptr_t* interpreter_frame_bcx_addr() const;
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191 intptr_t* interpreter_frame_mdx_addr() const;
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192
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193 public:
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194 // Tags for TaggedStackInterpreter
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195 enum Tag {
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196 TagValue = 0, // Important: must be zero to use G0 on sparc.
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197 TagReference = 0x555, // Reference type - is an oop that needs gc.
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198 TagCategory2 = 0x666 // Only used internally by interpreter
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199 // and not written to the java stack.
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200 // The values above are chosen so that misuse causes a crash
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201 // with a recognizable value.
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202 };
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203
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204 static Tag tag_for_basic_type(BasicType typ) {
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205 return (typ == T_OBJECT ? TagReference : TagValue);
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206 }
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207
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208 // Locals
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209
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210 // The _at version returns a pointer because the address is used for GC.
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211 intptr_t* interpreter_frame_local_at(int index) const;
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212 Tag interpreter_frame_local_tag(int index) const;
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213 void interpreter_frame_set_local_tag(int index, Tag tag) const;
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214
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215 void interpreter_frame_set_locals(intptr_t* locs);
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216
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217 // byte code index/pointer (use these functions for unchecked frame access only!)
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218 intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); }
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219 void interpreter_frame_set_bcx(intptr_t bcx);
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220
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221 // byte code index
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222 jint interpreter_frame_bci() const;
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223 void interpreter_frame_set_bci(jint bci);
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224
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225 // byte code pointer
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226 address interpreter_frame_bcp() const;
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227 void interpreter_frame_set_bcp(address bcp);
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228
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229 // Unchecked access to the method data index/pointer.
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230 // Only use this if you know what you are doing.
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231 intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); }
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232 void interpreter_frame_set_mdx(intptr_t mdx);
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233
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234 // method data pointer
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235 address interpreter_frame_mdp() const;
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236 void interpreter_frame_set_mdp(address dp);
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237
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238 // Find receiver out of caller's (compiled) argument list
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239 oop retrieve_receiver(RegisterMap *reg_map);
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240
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241 // Return the monitor owner and BasicLock for compiled synchronized
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242 // native methods so that biased locking can revoke the receiver's
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243 // bias if necessary. Takes optional nmethod for this frame as
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244 // argument to avoid performing repeated lookups in code cache.
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245 BasicLock* compiled_synchronized_native_monitor (nmethod* nm = NULL);
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246 oop compiled_synchronized_native_monitor_owner(nmethod* nm = NULL);
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247
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248 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is
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249 // not setup)
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250 oop interpreter_callee_receiver(symbolHandle signature) { return *interpreter_callee_receiver_addr(signature); }
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251
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252
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253 oop *interpreter_callee_receiver_addr(symbolHandle signature);
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254
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255
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256 // expression stack (may go up or down, direction == 1 or -1)
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257 public:
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258 intptr_t* interpreter_frame_expression_stack() const;
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259 static jint interpreter_frame_expression_stack_direction();
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260
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261 // The _at version returns a pointer because the address is used for GC.
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262 intptr_t* interpreter_frame_expression_stack_at(jint offset) const;
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263 Tag interpreter_frame_expression_stack_tag(jint offset) const;
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264 void interpreter_frame_set_expression_stack_tag(jint offset, Tag tag) const;
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265
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266 // top of expression stack
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267 intptr_t* interpreter_frame_tos_at(jint offset) const;
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268 intptr_t* interpreter_frame_tos_address() const;
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269
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270
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271 jint interpreter_frame_expression_stack_size() const;
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272
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273 intptr_t* interpreter_frame_sender_sp() const;
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274
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275 #ifndef CC_INTERP
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276 // template based interpreter deoptimization support
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277 void set_interpreter_frame_sender_sp(intptr_t* sender_sp);
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278 void interpreter_frame_set_monitor_end(BasicObjectLock* value);
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279 #endif // CC_INTERP
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280
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281 // BasicObjectLocks:
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282 //
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283 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end
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284 // Interpreter_frame_monitor_begin points to one element beyond the oldest one,
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285 // interpreter_frame_monitor_end points to the youngest one, or if there are none,
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286 // it points to one beyond where the first element will be.
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287 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack.
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288 // this value is >= BasicObjectLock::size(), and may be rounded up
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289
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290 BasicObjectLock* interpreter_frame_monitor_begin() const;
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291 BasicObjectLock* interpreter_frame_monitor_end() const;
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292 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const;
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293 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const;
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294 static int interpreter_frame_monitor_size();
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295
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296 void interpreter_frame_verify_monitor(BasicObjectLock* value) const;
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297
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298 // Tells whether the current interpreter_frame frame pointer
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299 // corresponds to the old compiled/deoptimized fp
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300 // The receiver used to be a top level frame
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301 bool interpreter_frame_equals_unpacked_fp(intptr_t* fp);
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302
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303 // Return/result value from this interpreter frame
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304 // If the method return type is T_OBJECT or T_ARRAY populates oop_result
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305 // For other (non-T_VOID) the appropriate field in the jvalue is populated
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306 // with the result value.
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307 // Should only be called when at method exit when the method is not
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308 // exiting due to an exception.
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309 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result);
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310
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311 public:
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312 // Method & constant pool cache
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313 methodOop interpreter_frame_method() const;
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314 void interpreter_frame_set_method(methodOop method);
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315 methodOop* interpreter_frame_method_addr() const;
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316 constantPoolCacheOop* interpreter_frame_cache_addr() const;
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317
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318 public:
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319 // Entry frames
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320 JavaCallWrapper* entry_frame_call_wrapper() const;
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321 intptr_t* entry_frame_argument_at(int offset) const;
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322
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323 // tells whether there is another chunk of Delta stack above
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324 bool entry_frame_is_first() const;
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325
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326 // Compiled frames:
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327
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328 public:
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329 // Given the index of a local, and the number of argument words
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330 // in this stack frame, tell which word of the stack frame to find
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331 // the local in. Arguments are stored above the ofp/rpc pair,
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332 // while other locals are stored below it.
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333 // Since monitors (BasicLock blocks) are also assigned indexes,
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334 // but may have different storage requirements, their presence
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335 // can also affect the calculation of offsets.
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336 static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
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337
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338 // Given the index of a monitor, etc., tell which word of the
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339 // stack frame contains the start of the BasicLock block.
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340 // Note that the local index by convention is the __higher__
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341 // of the two indexes allocated to the block.
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342 static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
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343
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344 // Tell the smallest value that local_offset_for_compiler will attain.
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345 // This is used to help determine how much stack frame to allocate.
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346 static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors);
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347
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348 // Tells if this register must be spilled during a call.
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349 // On Intel, all registers are smashed by calls.
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350 static bool volatile_across_calls(Register reg);
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351
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352
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353 // Safepoints
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354
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355 public:
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356 oop saved_oop_result(RegisterMap* map) const;
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357 void set_saved_oop_result(RegisterMap* map, oop obj);
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358
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359 // For debugging
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360 private:
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361 const char* print_name() const;
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362
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363 public:
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364 void print_value() const { print_value_on(tty,NULL); }
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365 void print_value_on(outputStream* st, JavaThread *thread) const;
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366 void print_on(outputStream* st) const;
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367 void interpreter_frame_print_on(outputStream* st) const;
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368 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const;
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369
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370 // Conversion from an VMReg to physical stack location
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371 oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const;
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372
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373 // Oops-do's
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374 void oops_compiled_arguments_do(symbolHandle signature, bool is_static, const RegisterMap* reg_map, OopClosure* f);
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375 void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true);
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376
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377 private:
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378 void oops_interpreted_locals_do(OopClosure *f,
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379 int max_locals,
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380 InterpreterOopMap *mask);
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381 void oops_interpreted_expressions_do(OopClosure *f, symbolHandle signature,
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382 bool is_static, int max_stack, int max_locals,
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383 InterpreterOopMap *mask);
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384 void oops_interpreted_arguments_do(symbolHandle signature, bool is_static, OopClosure* f);
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385
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386 // Iteration of oops
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387 void oops_do_internal(OopClosure* f, RegisterMap* map, bool use_interpreter_oop_map_cache);
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388 void oops_entry_do(OopClosure* f, const RegisterMap* map);
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389 void oops_code_blob_do(OopClosure* f, const RegisterMap* map);
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390 int adjust_offset(methodOop method, int index); // helper for above fn
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391 // Iteration of nmethods
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392 void nmethods_code_blob_do();
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393 public:
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394 // Memory management
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395 void oops_do(OopClosure* f, RegisterMap* map) { oops_do_internal(f, map, true); }
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396 void nmethods_do();
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397
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398 void gc_prologue();
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399 void gc_epilogue();
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400 void pd_gc_epilog();
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401
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402 # ifdef ENABLE_ZAP_DEAD_LOCALS
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403 private:
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404 class CheckValueClosure: public OopClosure {
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405 public: void do_oop(oop* p);
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406 };
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407 static CheckValueClosure _check_value;
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408
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409 class CheckOopClosure: public OopClosure {
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410 public: void do_oop(oop* p);
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411 };
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412 static CheckOopClosure _check_oop;
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413
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414 static void check_derived_oop(oop* base, oop* derived);
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415
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416 class ZapDeadClosure: public OopClosure {
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417 public: void do_oop(oop* p);
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418 };
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419 static ZapDeadClosure _zap_dead;
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420
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421 public:
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422 // Zapping
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423 void zap_dead_locals (JavaThread* thread, const RegisterMap* map);
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424 void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map);
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425 void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map);
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426 void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map);
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427 void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map);
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428 # endif
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429 // Verification
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430 void verify(const RegisterMap* map);
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431 static bool verify_return_pc(address x);
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432 static bool is_bci(intptr_t bcx);
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433 // Usage:
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434 // assert(frame::verify_return_pc(return_address), "must be a return pc");
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435
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436 int pd_oop_map_offset_adjustment() const;
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437
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438 # include "incls/_frame_pd.hpp.incl"
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439 };
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440
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441
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442 //
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443 // StackFrameStream iterates through the frames of a thread starting from
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444 // top most frame. It automatically takes care of updating the location of
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445 // all (callee-saved) registers. Notice: If a thread is stopped at
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446 // a safepoint, all registers are saved, not only the callee-saved ones.
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447 //
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448 // Use:
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449 //
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450 // for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) {
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451 // ...
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452 // }
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453 //
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454 class StackFrameStream : public StackObj {
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455 private:
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456 frame _fr;
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457 RegisterMap _reg_map;
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458 bool _is_done;
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459 public:
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460 StackFrameStream(JavaThread *thread, bool update = true);
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461
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462 // Iteration
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463 bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); }
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464 void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); }
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465
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466 // Query
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467 frame *current() { return &_fr; }
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468 RegisterMap* register_map() { return &_reg_map; }
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469 };
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