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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 // vframes are virtual stack frames representing source level activations. |
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26 // A single frame may hold several source level activations in the case of |
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27 // optimized code. The debugging stored with the optimized code enables |
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28 // us to unfold a frame as a stack of vframes. |
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29 // A cVFrame represents an activation of a non-java method. |
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30 |
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31 // The vframe inheritance hierarchy: |
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32 // - vframe |
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33 // - javaVFrame |
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34 // - interpretedVFrame |
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35 // - compiledVFrame ; (used for both compiled Java methods and native stubs) |
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36 // - externalVFrame |
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37 // - entryVFrame ; special frame created when calling Java from C |
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38 |
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39 // - BasicLock |
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40 |
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41 class vframe: public ResourceObj { |
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42 protected: |
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43 frame _fr; // Raw frame behind the virtual frame. |
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44 RegisterMap _reg_map; // Register map for the raw frame (used to handle callee-saved registers). |
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45 JavaThread* _thread; // The thread owning the raw frame. |
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46 |
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47 vframe(const frame* fr, const RegisterMap* reg_map, JavaThread* thread); |
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48 vframe(const frame* fr, JavaThread* thread); |
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49 public: |
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50 // Factory method for creating vframes |
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51 static vframe* new_vframe(const frame* f, const RegisterMap *reg_map, JavaThread* thread); |
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52 |
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53 // Accessors |
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54 frame fr() const { return _fr; } |
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55 CodeBlob* cb() const { return _fr.cb(); } |
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56 nmethod* nm() const { |
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57 assert( cb() != NULL && cb()->is_nmethod(), "usage"); |
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58 return (nmethod*) cb(); |
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59 } |
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60 |
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61 // ???? Does this need to be a copy? |
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62 frame* frame_pointer() { return &_fr; } |
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63 const RegisterMap* register_map() const { return &_reg_map; } |
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64 JavaThread* thread() const { return _thread; } |
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65 |
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66 // Returns the sender vframe |
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67 virtual vframe* sender() const; |
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68 |
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69 // Returns the next javaVFrame on the stack (skipping all other kinds of frame) |
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70 javaVFrame *java_sender() const; |
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71 |
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72 // Answers if the this is the top vframe in the frame, i.e., if the sender vframe |
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73 // is in the caller frame |
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74 virtual bool is_top() const { return true; } |
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75 |
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76 // Returns top vframe within same frame (see is_top()) |
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77 virtual vframe* top() const; |
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78 |
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79 // Type testing operations |
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80 virtual bool is_entry_frame() const { return false; } |
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81 virtual bool is_java_frame() const { return false; } |
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82 virtual bool is_interpreted_frame() const { return false; } |
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83 virtual bool is_compiled_frame() const { return false; } |
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84 |
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85 #ifndef PRODUCT |
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86 // printing operations |
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87 virtual void print_value() const; |
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88 virtual void print(); |
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89 #endif |
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90 }; |
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91 |
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92 |
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93 class javaVFrame: public vframe { |
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94 public: |
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95 // JVM state |
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96 virtual methodOop method() const = 0; |
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97 virtual int bci() const = 0; |
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98 virtual StackValueCollection* locals() const = 0; |
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99 virtual StackValueCollection* expressions() const = 0; |
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100 // the order returned by monitors() is from oldest -> youngest#4418568 |
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101 virtual GrowableArray<MonitorInfo*>* monitors() const = 0; |
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102 |
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103 // Debugging support via JVMTI. |
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104 // NOTE that this is not guaranteed to give correct results for compiled vframes. |
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105 // Deoptimize first if necessary. |
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106 virtual void set_locals(StackValueCollection* values) const = 0; |
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107 |
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108 // Test operation |
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109 bool is_java_frame() const { return true; } |
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110 |
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111 protected: |
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112 javaVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : vframe(fr, reg_map, thread) {} |
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113 javaVFrame(const frame* fr, JavaThread* thread) : vframe(fr, thread) {} |
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114 |
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115 public: |
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116 // casting |
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117 static javaVFrame* cast(vframe* vf) { |
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118 assert(vf == NULL || vf->is_java_frame(), "must be java frame"); |
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119 return (javaVFrame*) vf; |
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120 } |
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121 |
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122 // Return an array of monitors locked by this frame in the youngest to oldest order |
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123 GrowableArray<MonitorInfo*>* locked_monitors(); |
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124 |
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125 // printing used during stack dumps |
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126 void print_lock_info_on(outputStream* st, int frame_count); |
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127 void print_lock_info(int frame_count) { print_lock_info_on(tty, frame_count); } |
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128 |
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129 #ifndef PRODUCT |
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130 public: |
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131 // printing operations |
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132 void print(); |
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133 void print_value() const; |
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134 void print_activation(int index) const; |
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135 |
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136 // verify operations |
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137 virtual void verify() const; |
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138 |
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139 // Structural compare |
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140 bool structural_compare(javaVFrame* other); |
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141 #endif |
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142 friend class vframe; |
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143 }; |
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144 |
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145 class interpretedVFrame: public javaVFrame { |
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146 public: |
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147 // JVM state |
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148 methodOop method() const; |
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149 int bci() const; |
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150 StackValueCollection* locals() const; |
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151 StackValueCollection* expressions() const; |
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152 GrowableArray<MonitorInfo*>* monitors() const; |
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153 |
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154 void set_locals(StackValueCollection* values) const; |
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155 |
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156 // Test operation |
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157 bool is_interpreted_frame() const { return true; } |
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158 |
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159 protected: |
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160 interpretedVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : javaVFrame(fr, reg_map, thread) {}; |
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161 |
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162 public: |
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163 // Accessors for Byte Code Pointer |
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164 u_char* bcp() const; |
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165 void set_bcp(u_char* bcp); |
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166 |
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167 // casting |
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168 static interpretedVFrame* cast(vframe* vf) { |
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169 assert(vf == NULL || vf->is_interpreted_frame(), "must be interpreted frame"); |
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170 return (interpretedVFrame*) vf; |
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171 } |
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172 |
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173 private: |
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174 static const int bcp_offset; |
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175 intptr_t* locals_addr_at(int offset) const; |
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176 |
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177 // returns where the parameters starts relative to the frame pointer |
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178 int start_of_parameters() const; |
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179 |
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180 #ifndef PRODUCT |
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181 public: |
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182 // verify operations |
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183 void verify() const; |
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184 #endif |
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185 friend class vframe; |
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186 }; |
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187 |
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188 |
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189 class externalVFrame: public vframe { |
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190 protected: |
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191 externalVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread) : vframe(fr, reg_map, thread) {} |
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192 |
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193 #ifndef PRODUCT |
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194 public: |
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195 // printing operations |
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196 void print_value() const; |
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197 void print(); |
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198 #endif |
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199 friend class vframe; |
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200 }; |
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201 |
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202 class entryVFrame: public externalVFrame { |
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203 public: |
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204 bool is_entry_frame() const { return true; } |
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205 |
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206 protected: |
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207 entryVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread); |
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208 |
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209 public: |
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210 // casting |
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211 static entryVFrame* cast(vframe* vf) { |
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212 assert(vf == NULL || vf->is_entry_frame(), "must be entry frame"); |
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213 return (entryVFrame*) vf; |
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214 } |
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215 |
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216 #ifndef PRODUCT |
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217 public: |
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218 // printing |
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219 void print_value() const; |
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220 void print(); |
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221 #endif |
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222 friend class vframe; |
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223 }; |
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224 |
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225 |
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226 // A MonitorInfo is a ResourceObject that describes a the pair: |
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227 // 1) the owner of the monitor |
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228 // 2) the monitor lock |
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229 class MonitorInfo : public ResourceObj { |
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230 private: |
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231 oop _owner; // the object owning the monitor |
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232 BasicLock* _lock; |
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233 public: |
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234 // Constructor |
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235 MonitorInfo(oop owner, BasicLock* lock) { |
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236 _owner = owner; |
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237 _lock = lock; |
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238 } |
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239 // Accessors |
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240 oop owner() const { return _owner; } |
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241 BasicLock* lock() const { return _lock; } |
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242 }; |
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243 |
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244 class vframeStreamCommon : StackObj { |
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245 protected: |
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246 // common |
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247 frame _frame; |
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248 JavaThread* _thread; |
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249 RegisterMap _reg_map; |
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250 enum { interpreted_mode, compiled_mode, at_end_mode } _mode; |
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251 |
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252 int _sender_decode_offset; |
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253 |
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254 // Cached information |
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255 methodOop _method; |
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256 int _bci; |
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257 |
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258 // Should VM activations be ignored or not |
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259 bool _stop_at_java_call_stub; |
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260 |
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261 bool fill_in_compiled_inlined_sender(); |
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262 void fill_from_compiled_frame(int decode_offset); |
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263 void fill_from_compiled_native_frame(); |
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264 |
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265 void found_bad_method_frame(); |
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266 |
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267 void fill_from_interpreter_frame(); |
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268 bool fill_from_frame(); |
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269 |
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270 // Helper routine for security_get_caller_frame |
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271 void skip_prefixed_method_and_wrappers(); |
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272 |
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273 public: |
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274 // Constructor |
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275 vframeStreamCommon(JavaThread* thread) : _reg_map(thread, false) { |
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276 _thread = thread; |
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277 } |
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278 |
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279 // Accessors |
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280 methodOop method() const { return _method; } |
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281 int bci() const { return _bci; } |
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282 intptr_t* frame_id() const { return _frame.id(); } |
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283 address frame_pc() const { return _frame.pc(); } |
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284 |
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285 CodeBlob* cb() const { return _frame.cb(); } |
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286 nmethod* nm() const { |
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287 assert( cb() != NULL && cb()->is_nmethod(), "usage"); |
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288 return (nmethod*) cb(); |
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289 } |
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290 |
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291 // Frame type |
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292 bool is_interpreted_frame() const { return _frame.is_interpreted_frame(); } |
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293 bool is_entry_frame() const { return _frame.is_entry_frame(); } |
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294 |
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295 // Iteration |
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296 void next() { |
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297 // handle frames with inlining |
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298 if (_mode == compiled_mode && fill_in_compiled_inlined_sender()) return; |
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299 |
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300 // handle general case |
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301 do { |
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302 _frame = _frame.sender(&_reg_map); |
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303 } while (!fill_from_frame()); |
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304 } |
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305 |
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306 bool at_end() const { return _mode == at_end_mode; } |
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307 |
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308 // Implements security traversal. Skips depth no. of frame including |
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309 // special security frames and prefixed native methods |
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310 void security_get_caller_frame(int depth); |
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311 |
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312 // Helper routine for JVM_LatestUserDefinedLoader -- needed for 1.4 |
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313 // reflection implementation |
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314 void skip_reflection_related_frames(); |
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315 }; |
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316 |
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317 class vframeStream : public vframeStreamCommon { |
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318 public: |
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319 // Constructors |
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320 vframeStream(JavaThread* thread, bool stop_at_java_call_stub = false) |
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321 : vframeStreamCommon(thread) { |
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322 _stop_at_java_call_stub = stop_at_java_call_stub; |
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323 |
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324 if (!thread->has_last_Java_frame()) { |
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325 _mode = at_end_mode; |
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326 return; |
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327 } |
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328 |
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329 _frame = _thread->last_frame(); |
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330 while (!fill_from_frame()) { |
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331 _frame = _frame.sender(&_reg_map); |
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332 } |
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333 } |
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334 |
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335 // top_frame may not be at safepoint, start with sender |
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336 vframeStream(JavaThread* thread, frame top_frame, bool stop_at_java_call_stub = false); |
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337 }; |
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338 |
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339 |
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340 inline bool vframeStreamCommon::fill_in_compiled_inlined_sender() { |
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341 if (_sender_decode_offset == DebugInformationRecorder::serialized_null) { |
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342 return false; |
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343 } |
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344 fill_from_compiled_frame(_sender_decode_offset); |
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345 return true; |
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346 } |
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347 |
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348 |
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349 inline void vframeStreamCommon::fill_from_compiled_frame(int decode_offset) { |
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350 _mode = compiled_mode; |
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351 |
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352 // Range check to detect ridiculous offsets. |
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353 if (decode_offset == DebugInformationRecorder::serialized_null || |
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354 decode_offset < 0 || |
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355 decode_offset >= nm()->scopes_data_size()) { |
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356 // 6379830 AsyncGetCallTrace sometimes feeds us wild frames. |
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357 // If we attempt to read nmethod::scopes_data at serialized_null (== 0), |
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358 // or if we read some at other crazy offset, |
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359 // we will decode garbage and make wild references into the heap, |
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360 // leading to crashes in product mode. |
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361 // (This isn't airtight, of course, since there are internal |
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362 // offsets which are also crazy.) |
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363 #ifdef ASSERT |
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364 if (WizardMode) { |
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365 tty->print_cr("Error in fill_from_frame: pc_desc for " |
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366 INTPTR_FORMAT " not found or invalid at %d", |
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367 _frame.pc(), decode_offset); |
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368 nm()->print(); |
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369 nm()->method()->print_codes(); |
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370 nm()->print_code(); |
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371 nm()->print_pcs(); |
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372 } |
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373 #endif |
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374 // Provide a cheap fallback in product mode. (See comment above.) |
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375 found_bad_method_frame(); |
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376 fill_from_compiled_native_frame(); |
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377 return; |
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378 } |
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379 |
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380 // Decode first part of scopeDesc |
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381 DebugInfoReadStream buffer(nm(), decode_offset); |
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382 _sender_decode_offset = buffer.read_int(); |
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383 _method = methodOop(buffer.read_oop()); |
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384 _bci = buffer.read_bci(); |
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385 |
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386 assert(_method->is_method(), "checking type of decoded method"); |
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387 } |
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388 |
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389 // The native frames are handled specially. We do not rely on ScopeDesc info |
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390 // since the pc might not be exact due to the _last_native_pc trick. |
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391 inline void vframeStreamCommon::fill_from_compiled_native_frame() { |
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392 _mode = compiled_mode; |
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393 _sender_decode_offset = DebugInformationRecorder::serialized_null; |
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394 _method = nm()->method(); |
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395 _bci = 0; |
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396 } |
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397 |
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398 inline bool vframeStreamCommon::fill_from_frame() { |
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399 // Interpreted frame |
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400 if (_frame.is_interpreted_frame()) { |
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401 fill_from_interpreter_frame(); |
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402 return true; |
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403 } |
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404 |
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405 // Compiled frame |
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406 |
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407 if (cb() != NULL && cb()->is_nmethod()) { |
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408 if (nm()->is_native_method()) { |
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409 // Do not rely on scopeDesc since the pc might be unprecise due to the _last_native_pc trick. |
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410 fill_from_compiled_native_frame(); |
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411 } else { |
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412 PcDesc* pc_desc = nm()->pc_desc_at(_frame.pc()); |
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413 int decode_offset; |
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414 if (pc_desc == NULL) { |
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415 // Should not happen, but let fill_from_compiled_frame handle it. |
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416 decode_offset = DebugInformationRecorder::serialized_null; |
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417 } else { |
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418 decode_offset = pc_desc->scope_decode_offset(); |
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419 } |
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420 fill_from_compiled_frame(decode_offset); |
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421 } |
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422 return true; |
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423 } |
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424 |
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425 // End of stack? |
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426 if (_frame.is_first_frame() || (_stop_at_java_call_stub && _frame.is_entry_frame())) { |
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427 _mode = at_end_mode; |
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428 return true; |
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429 } |
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430 |
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431 return false; |
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432 } |
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433 |
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434 |
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435 inline void vframeStreamCommon::fill_from_interpreter_frame() { |
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436 methodOop method = _frame.interpreter_frame_method(); |
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437 intptr_t bcx = _frame.interpreter_frame_bcx(); |
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438 int bci = method->validate_bci_from_bcx(bcx); |
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439 // 6379830 AsyncGetCallTrace sometimes feeds us wild frames. |
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440 if (bci < 0) { |
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441 found_bad_method_frame(); |
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442 bci = 0; // pretend it's on the point of entering |
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443 } |
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444 _mode = interpreted_mode; |
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445 _method = method; |
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446 _bci = bci; |
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447 } |