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1 /* |
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2 * Copyright 2003-2007 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 # include "incls/_precompiled.incl" |
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26 # include "incls/_jvmtiCodeBlobEvents.cpp.incl" |
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27 |
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28 // Support class to collect a list of the non-nmethod CodeBlobs in |
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29 // the CodeCache. |
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30 // |
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31 // This class actually creates a list of JvmtiCodeBlobDesc - each JvmtiCodeBlobDesc |
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32 // describes a single CodeBlob in the CodeCache. Note that collection is |
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33 // done to a static list - this is because CodeCache::blobs_do is defined |
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34 // as void CodeCache::blobs_do(void f(CodeBlob* nm)) and hence requires |
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35 // a C or static method. |
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36 // |
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37 // Usage :- |
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38 // |
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39 // CodeBlobCollector collector; |
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40 // |
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41 // collector.collect(); |
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42 // JvmtiCodeBlobDesc* blob = collector.first(); |
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43 // while (blob != NULL) { |
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44 // : |
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45 // blob = collector.next(); |
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46 // } |
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47 // |
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48 |
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49 class CodeBlobCollector : StackObj { |
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50 private: |
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51 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected blobs |
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52 int _pos; // iterator position |
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53 |
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54 // used during a collection |
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55 static GrowableArray<JvmtiCodeBlobDesc*>* _global_code_blobs; |
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56 static void do_blob(CodeBlob* cb); |
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57 public: |
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58 CodeBlobCollector() { |
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59 _code_blobs = NULL; |
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60 _pos = -1; |
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61 } |
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62 ~CodeBlobCollector() { |
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63 if (_code_blobs != NULL) { |
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64 for (int i=0; i<_code_blobs->length(); i++) { |
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65 FreeHeap(_code_blobs->at(i)); |
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66 } |
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67 delete _code_blobs; |
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68 } |
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69 } |
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70 |
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71 // collect list of code blobs in the cache |
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72 void collect(); |
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73 |
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74 // iteration support - return first code blob |
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75 JvmtiCodeBlobDesc* first() { |
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76 assert(_code_blobs != NULL, "not collected"); |
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77 if (_code_blobs->length() == 0) { |
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78 return NULL; |
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79 } |
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80 _pos = 0; |
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81 return _code_blobs->at(0); |
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82 } |
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83 |
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84 // iteration support - return next code blob |
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85 JvmtiCodeBlobDesc* next() { |
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86 assert(_pos >= 0, "iteration not started"); |
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87 if (_pos+1 >= _code_blobs->length()) { |
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88 return NULL; |
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89 } |
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90 return _code_blobs->at(++_pos); |
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91 } |
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92 |
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93 }; |
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94 |
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95 // used during collection |
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96 GrowableArray<JvmtiCodeBlobDesc*>* CodeBlobCollector::_global_code_blobs; |
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97 |
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98 |
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99 // called for each CodeBlob in the CodeCache |
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100 // |
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101 // This function filters out nmethods as it is only interested in |
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102 // other CodeBlobs. This function also filters out CodeBlobs that have |
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103 // a duplicate starting address as previous blobs. This is needed to |
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104 // handle the case where multiple stubs are generated into a single |
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105 // BufferBlob. |
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106 |
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107 void CodeBlobCollector::do_blob(CodeBlob* cb) { |
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108 |
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109 // ignore nmethods |
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110 if (cb->is_nmethod()) { |
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111 return; |
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112 } |
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113 |
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114 // check if this starting address has been seen already - the |
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115 // assumption is that stubs are inserted into the list before the |
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116 // enclosing BufferBlobs. |
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117 address addr = cb->instructions_begin(); |
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118 for (int i=0; i<_global_code_blobs->length(); i++) { |
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119 JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i); |
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120 if (addr == scb->code_begin()) { |
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121 return; |
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122 } |
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123 } |
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124 |
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125 // we must name the CodeBlob - some CodeBlobs already have names :- |
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126 // - stubs used by compiled code to call a (static) C++ runtime routine |
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127 // - non-relocatable machine code such as the interpreter, stubroutines, etc. |
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128 // - various singleton blobs |
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129 // |
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130 // others are unnamed so we create a name :- |
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131 // - OSR adapter (interpreter frame that has been on-stack replaced) |
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132 // - I2C and C2I adapters |
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133 const char* name = NULL; |
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134 if (cb->is_runtime_stub()) { |
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135 name = ((RuntimeStub*)cb)->name(); |
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136 } |
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137 if (cb->is_buffer_blob()) { |
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138 name = ((BufferBlob*)cb)->name(); |
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139 } |
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140 if (cb->is_deoptimization_stub() || cb->is_safepoint_stub()) { |
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141 name = ((SingletonBlob*)cb)->name(); |
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142 } |
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143 if (cb->is_uncommon_trap_stub() || cb->is_exception_stub()) { |
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144 name = ((SingletonBlob*)cb)->name(); |
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145 } |
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146 |
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147 // record the CodeBlob details as a JvmtiCodeBlobDesc |
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148 JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(name, cb->instructions_begin(), |
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149 cb->instructions_end()); |
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150 _global_code_blobs->append(scb); |
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151 } |
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152 |
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153 |
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154 // collects a list of CodeBlobs in the CodeCache. |
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155 // |
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156 // The created list is growable array of JvmtiCodeBlobDesc - each one describes |
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157 // a CodeBlob. Note that the list is static - this is because CodeBlob::blobs_do |
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158 // requires a a C or static function so we can't use an instance function. This |
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159 // isn't a problem as the iteration is serial anyway as we need the CodeCache_lock |
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160 // to iterate over the code cache. |
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161 // |
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162 // Note that the CodeBlobs in the CodeCache will include BufferBlobs that may |
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163 // contain multiple stubs. As a profiler is interested in the stubs rather than |
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164 // the enclosing container we first iterate over the stub code descriptors so |
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165 // that the stubs go into the list first. do_blob will then filter out the |
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166 // enclosing blobs if the starting address of the enclosing blobs matches the |
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167 // starting address of first stub generated in the enclosing blob. |
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168 |
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169 void CodeBlobCollector::collect() { |
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170 assert_locked_or_safepoint(CodeCache_lock); |
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171 assert(_global_code_blobs == NULL, "checking"); |
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172 |
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173 // create the global list |
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174 _global_code_blobs = new (ResourceObj::C_HEAP) GrowableArray<JvmtiCodeBlobDesc*>(50,true); |
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175 |
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176 // iterate over the stub code descriptors and put them in the list first. |
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177 int index = 0; |
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178 StubCodeDesc* desc; |
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179 while ((desc = StubCodeDesc::desc_for_index(++index)) != NULL) { |
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180 _global_code_blobs->append(new JvmtiCodeBlobDesc(desc->name(), desc->begin(), desc->end())); |
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181 } |
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182 |
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183 // next iterate over all the non-nmethod code blobs and add them to |
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184 // the list - as noted above this will filter out duplicates and |
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185 // enclosing blobs. |
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186 CodeCache::blobs_do(do_blob); |
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187 |
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188 // make the global list the instance list so that it can be used |
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189 // for other iterations. |
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190 _code_blobs = _global_code_blobs; |
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191 _global_code_blobs = NULL; |
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192 } |
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193 |
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194 |
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195 // Generate a DYNAMIC_CODE_GENERATED event for each non-nmethod code blob. |
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196 |
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197 jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) { |
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198 CodeBlobCollector collector; |
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199 |
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200 // first collect all the code blobs |
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201 { |
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202 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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203 collector.collect(); |
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204 } |
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205 |
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206 // iterate over the collected list and post an event for each blob |
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207 JvmtiCodeBlobDesc* blob = collector.first(); |
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208 while (blob != NULL) { |
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209 JvmtiExport::post_dynamic_code_generated(env, blob->name(), blob->code_begin(), blob->code_end()); |
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210 blob = collector.next(); |
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211 } |
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212 return JVMTI_ERROR_NONE; |
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213 } |
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214 |
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215 |
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216 // Support class to describe a nmethod in the CodeCache |
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217 |
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218 class nmethodDesc: public CHeapObj { |
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219 private: |
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220 methodHandle _method; |
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221 address _code_begin; |
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222 address _code_end; |
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223 jvmtiAddrLocationMap* _map; |
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224 jint _map_length; |
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225 public: |
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226 nmethodDesc(methodHandle method, address code_begin, address code_end, |
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227 jvmtiAddrLocationMap* map, jint map_length) { |
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228 _method = method; |
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229 _code_begin = code_begin; |
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230 _code_end = code_end; |
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231 _map = map; |
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232 _map_length = map_length; |
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233 } |
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234 methodHandle method() const { return _method; } |
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235 address code_begin() const { return _code_begin; } |
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236 address code_end() const { return _code_end; } |
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237 jvmtiAddrLocationMap* map() const { return _map; } |
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238 jint map_length() const { return _map_length; } |
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239 }; |
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240 |
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241 |
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242 // Support class to collect a list of the nmethod CodeBlobs in |
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243 // the CodeCache. |
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244 // |
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245 // Usage :- |
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246 // |
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247 // nmethodCollector collector; |
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248 // |
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249 // collector.collect(); |
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250 // JvmtiCodeBlobDesc* blob = collector.first(); |
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251 // while (blob != NULL) { |
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252 // : |
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253 // blob = collector.next(); |
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254 // } |
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255 // |
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256 class nmethodCollector : StackObj { |
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257 private: |
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258 GrowableArray<nmethodDesc*>* _nmethods; // collect nmethods |
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259 int _pos; // iteration support |
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260 |
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261 // used during a collection |
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262 static GrowableArray<nmethodDesc*>* _global_nmethods; |
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263 static void do_nmethod(nmethod* nm); |
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264 public: |
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265 nmethodCollector() { |
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266 _nmethods = NULL; |
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267 _pos = -1; |
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268 } |
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269 ~nmethodCollector() { |
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270 if (_nmethods != NULL) { |
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271 for (int i=0; i<_nmethods->length(); i++) { |
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272 nmethodDesc* blob = _nmethods->at(i); |
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273 if (blob->map()!= NULL) { |
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274 FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, blob->map()); |
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275 } |
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276 } |
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277 delete _nmethods; |
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278 } |
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279 } |
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280 |
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281 // collect list of nmethods in the cache |
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282 void collect(); |
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283 |
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284 // iteration support - return first code blob |
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285 nmethodDesc* first() { |
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286 assert(_nmethods != NULL, "not collected"); |
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287 if (_nmethods->length() == 0) { |
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288 return NULL; |
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289 } |
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290 _pos = 0; |
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291 return _nmethods->at(0); |
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292 } |
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293 |
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294 // iteration support - return next code blob |
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295 nmethodDesc* next() { |
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296 assert(_pos >= 0, "iteration not started"); |
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297 if (_pos+1 >= _nmethods->length()) { |
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298 return NULL; |
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299 } |
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300 return _nmethods->at(++_pos); |
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301 } |
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302 }; |
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303 |
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304 // used during collection |
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305 GrowableArray<nmethodDesc*>* nmethodCollector::_global_nmethods; |
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306 |
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307 |
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308 // called for each nmethod in the CodeCache |
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309 // |
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310 // This function simply adds a descriptor for each nmethod to the global list. |
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311 |
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312 void nmethodCollector::do_nmethod(nmethod* nm) { |
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313 // ignore zombies |
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314 if (!nm->is_alive()) { |
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315 return; |
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316 } |
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317 |
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318 assert(nm->method() != NULL, "checking"); |
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319 |
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320 // create the location map for the nmethod. |
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321 jvmtiAddrLocationMap* map; |
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322 jint map_length; |
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323 JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &map, &map_length); |
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324 |
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325 // record the nmethod details |
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326 methodHandle mh(nm->method()); |
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327 nmethodDesc* snm = new nmethodDesc(mh, |
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328 nm->code_begin(), |
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329 nm->code_end(), |
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330 map, |
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331 map_length); |
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332 _global_nmethods->append(snm); |
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333 } |
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334 |
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335 // collects a list of nmethod in the CodeCache. |
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336 // |
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337 // The created list is growable array of nmethodDesc - each one describes |
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338 // a nmethod and includs its JVMTI address location map. |
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339 |
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340 void nmethodCollector::collect() { |
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341 assert_locked_or_safepoint(CodeCache_lock); |
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342 assert(_global_nmethods == NULL, "checking"); |
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343 |
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344 // create the list |
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345 _global_nmethods = new (ResourceObj::C_HEAP) GrowableArray<nmethodDesc*>(100,true); |
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346 |
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347 // any a descriptor for each nmethod to the list. |
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348 CodeCache::nmethods_do(do_nmethod); |
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349 |
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350 // make the list the instance list |
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351 _nmethods = _global_nmethods; |
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352 _global_nmethods = NULL; |
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353 } |
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354 |
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355 // Generate a COMPILED_METHOD_LOAD event for each nnmethod |
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356 |
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357 jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) { |
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358 HandleMark hm; |
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359 nmethodCollector collector; |
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360 |
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361 // first collect all nmethods |
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362 { |
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363 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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364 collector.collect(); |
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365 } |
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366 |
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367 // iterate over the list and post an event for each nmethod |
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368 nmethodDesc* nm_desc = collector.first(); |
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369 while (nm_desc != NULL) { |
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370 methodOop method = nm_desc->method()(); |
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371 jmethodID mid = method->jmethod_id(); |
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372 assert(mid != NULL, "checking"); |
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373 JvmtiExport::post_compiled_method_load(env, mid, |
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374 (jint)(nm_desc->code_end() - nm_desc->code_begin()), |
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375 nm_desc->code_begin(), nm_desc->map_length(), |
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376 nm_desc->map()); |
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377 nm_desc = collector.next(); |
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378 } |
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379 return JVMTI_ERROR_NONE; |
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380 } |
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381 |
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382 |
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383 // create a C-heap allocated address location map for an nmethod |
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384 void JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nmethod *nm, |
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385 jvmtiAddrLocationMap** map_ptr, |
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386 jint *map_length_ptr) |
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387 { |
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388 ResourceMark rm; |
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389 jvmtiAddrLocationMap* map = NULL; |
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390 jint map_length = 0; |
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391 |
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392 |
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393 // Generate line numbers using PcDesc and ScopeDesc info |
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394 methodHandle mh(nm->method()); |
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395 |
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396 if (!mh->is_native()) { |
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397 PcDesc *pcd; |
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398 int pcds_in_method; |
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399 |
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400 pcds_in_method = (nm->scopes_pcs_end() - nm->scopes_pcs_begin()); |
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401 map = NEW_C_HEAP_ARRAY(jvmtiAddrLocationMap, pcds_in_method); |
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402 |
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403 address scopes_data = nm->scopes_data_begin(); |
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404 for( pcd = nm->scopes_pcs_begin(); pcd < nm->scopes_pcs_end(); ++pcd ) { |
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405 ScopeDesc sc0(nm, pcd->scope_decode_offset()); |
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406 ScopeDesc *sd = &sc0; |
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407 while( !sd->is_top() ) { sd = sd->sender(); } |
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408 int bci = sd->bci(); |
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409 if (bci != InvocationEntryBci) { |
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410 assert(map_length < pcds_in_method, "checking"); |
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411 map[map_length].start_address = (const void*)pcd->real_pc(nm); |
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412 map[map_length].location = bci; |
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413 ++map_length; |
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414 } |
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415 } |
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416 } |
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417 |
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418 *map_ptr = map; |
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419 *map_length_ptr = map_length; |
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420 } |