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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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|
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447 }
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