0
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1 /*
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2 * Copyright 2002 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 <stdio.h>
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26 #include <stdarg.h>
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27 #include <stdlib.h>
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28 #include <vector>
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29 #include "sa.hpp"
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30 #include "jni.h"
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31 #include "jvmdi.h"
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32
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33 #ifndef WIN32
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34 #include <inttypes.h>
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35 #else
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36 typedef int int32_t;
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37 #endif
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38
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39 #ifdef WIN32
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40 #include <windows.h>
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41 #define YIELD() Sleep(0)
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42 #define SLEEP() Sleep(10)
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43 #define vsnprintf _vsnprintf
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44 #else
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45 Error: please port YIELD() and SLEEP() macros to your platform
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46 #endif
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47
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48 using namespace std;
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49
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50 //////////////////////////////////////////////////////////////////////
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51 // //
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52 // Exported "interface" for Java language-level interaction between //
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53 // the SA and the VM. Note that the SA knows about the layout of //
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54 // certain VM data structures and that knowledge is taken advantage //
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55 // of in this code, although this interfaces with the VM via JVMDI. //
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56 // //
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57 //////////////////////////////////////////////////////////////////////
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58
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59 extern "C" {
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60 /////////////////////////////////////
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61 // //
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62 // Events sent by the VM to the SA //
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63 // //
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64 /////////////////////////////////////
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65
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66 // Set by the SA when it attaches. Indicates that events should be
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67 // posted via these exported variables, and that the VM should wait
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68 // for those events to be acknowledged by the SA (via its setting
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69 // saEventPending to 0).
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70 JNIEXPORT volatile int32_t saAttached = 0;
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71
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72 // Set to nonzero value by the VM when an event has been posted; set
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73 // back to 0 by the SA when it has processed that event.
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74 JNIEXPORT volatile int32_t saEventPending = 0;
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75
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76 // Kind of the event (from jvmdi.h)
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77 JNIEXPORT volatile int32_t saEventKind = 0;
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78
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79 //
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80 // Exception events
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81 //
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82 JNIEXPORT jthread saExceptionThread;
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83 JNIEXPORT jclass saExceptionClass;
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84 JNIEXPORT jmethodID saExceptionMethod;
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85 JNIEXPORT int32_t saExceptionLocation;
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86 JNIEXPORT jobject saExceptionException;
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87 JNIEXPORT jclass saExceptionCatchClass;
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88 JNIEXPORT jmethodID saExceptionCatchMethod;
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89 JNIEXPORT int32_t saExceptionCatchLocation;
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90
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91 //
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92 // Breakpoint events
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93 //
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94 JNIEXPORT jthread saBreakpointThread;
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95 JNIEXPORT jclass saBreakpointClass;
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96 JNIEXPORT jmethodID saBreakpointMethod;
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97 JNIEXPORT jlocation saBreakpointLocation;
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98
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99 ///////////////////////////////////////
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100 // //
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101 // Commands sent by the SA to the VM //
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102 // //
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103 ///////////////////////////////////////
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104
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105 extern JNIEXPORT const int32_t SA_CMD_SUSPEND_ALL = 0;
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106 extern JNIEXPORT const int32_t SA_CMD_RESUME_ALL = 1;
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107 extern JNIEXPORT const int32_t SA_CMD_TOGGLE_BREAKPOINT = 2;
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108 extern JNIEXPORT const int32_t SA_CMD_BUF_SIZE = 1024;
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109
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110 // SA sets this to a nonzero value when it is requesting a command
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111 // to be processed; VM sets it back to 0 when the command has been
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112 // executed
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113 JNIEXPORT volatile int32_t saCmdPending = 0;
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114
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115 // SA sets this to one of the manifest constants above to indicate
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116 // the kind of command to be executed
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117 JNIEXPORT volatile int32_t saCmdType = 0;
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118
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119 // VM sets this to 0 if the last command succeeded or a nonzero
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120 // value if it failed
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121 JNIEXPORT volatile int32_t saCmdResult = 0;
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122
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123 // If last command failed, this buffer will contain a descriptive
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124 // error message
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125 JNIEXPORT char saCmdResultErrMsg[SA_CMD_BUF_SIZE];
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126
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127 //
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128 // Toggling of breakpoint command arguments.
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129 //
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130 // Originally there were separate set/clear breakpoint commands
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131 // taking a class name, method name and signature, and the iteration
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132 // through the debug information was done in the SA. It turns out
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133 // that doing this work in the target VM is significantly faster,
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134 // and since interactivity when setting and clearing breakpoints is
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135 // important, the solution which resulted in more C/C++ code was used.
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136 //
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137
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138 // Source file name
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139 JNIEXPORT char saCmdBkptSrcFileName[SA_CMD_BUF_SIZE];
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140
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141 // Package name ('/' as separator instead of '.')
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142 JNIEXPORT char saCmdBkptPkgName[SA_CMD_BUF_SIZE];
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143
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144 // Line number
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145 JNIEXPORT int32_t saCmdBkptLineNumber;
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146
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147 // Output back to SA: indicator whether the last failure of a
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148 // breakpoint toggle command was really an error or just a lack of
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149 // debug information covering the requested line. 0 if not error.
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150 // Valid only if saCmdResult != 0.
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151 JNIEXPORT int32_t saCmdBkptResWasError;
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152
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153 // Output back to SA: resulting line number at which the breakpoint
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154 // was set or cleared (valid only if saCmdResult == 0)
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155 JNIEXPORT int32_t saCmdBkptResLineNumber;
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156
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157 // Output back to SA: resulting byte code index at which the
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158 // breakpoint was set or cleared (valid only if saCmdResult == 0)
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159 JNIEXPORT int32_t saCmdBkptResBCI;
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160
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161 // Output back to SA: indicator whether the breakpoint operation
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162 // resulted in a set or cleared breakpoint; nonzero if set, zero if
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163 // cleared (valid only if saCmdResult == 0)
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164 JNIEXPORT int32_t saCmdBkptResWasSet;
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165
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166 // Output back to SA: method name the breakpoint was set in (valid
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167 // only if saCmdResult == 0)
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168 JNIEXPORT char saCmdBkptResMethodName[SA_CMD_BUF_SIZE];
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169
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170 // Output back to SA: method signature (JNI style) the breakpoint
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171 // was set in (valid only if saCmdResult == 0)
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172 JNIEXPORT char saCmdBkptResMethodSig[SA_CMD_BUF_SIZE];
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173 }
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174
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175 // Internal state
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176 static JavaVM* jvm = NULL;
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177 static JVMDI_Interface_1* jvmdi = NULL;
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178 static jthread debugThreadObj = NULL;
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179 static bool suspended = false;
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180 static vector<jthread> suspendedThreads;
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181 static JVMDI_RawMonitor eventLock = NULL;
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182
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183 class MonitorLocker {
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184 private:
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185 JVMDI_RawMonitor lock;
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186 public:
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187 MonitorLocker(JVMDI_RawMonitor lock) {
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188 this->lock = lock;
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189 if (lock != NULL) {
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190 jvmdi->RawMonitorEnter(lock);
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191 }
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192 }
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193 ~MonitorLocker() {
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194 if (lock != NULL) {
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195 jvmdi->RawMonitorExit(lock);
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196 }
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197 }
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198 };
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199
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200 class JvmdiDeallocator {
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201 private:
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202 void* ptr;
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203 public:
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204 JvmdiDeallocator(void* ptr) {
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205 this->ptr = ptr;
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206 }
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207 ~JvmdiDeallocator() {
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208 jvmdi->Deallocate((jbyte*) ptr);
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209 }
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210 };
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211
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212 class JvmdiRefListDeallocator {
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213 private:
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214 JNIEnv* env;
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215 jobject* refList;
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216 jint refCount;
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217 public:
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218 JvmdiRefListDeallocator(JNIEnv* env, jobject* refList, jint refCount) {
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219 this->env = env;
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220 this->refList = refList;
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221 this->refCount = refCount;
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222 }
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223 ~JvmdiRefListDeallocator() {
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224 for (int i = 0; i < refCount; i++) {
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225 env->DeleteGlobalRef(refList[i]);
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226 }
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227 jvmdi->Deallocate((jbyte*) refList);
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228 }
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229 };
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230
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231 static void
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232 stop(char* msg) {
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233 fprintf(stderr, "%s", msg);
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234 fprintf(stderr, "\n");
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235 exit(1);
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236 }
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237
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238 // This fills in the command result error message, sets the command
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239 // result to -1, and clears the pending command flag
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240 static void
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241 reportErrorToSA(const char* str, ...) {
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242 va_list varargs;
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243 va_start(varargs, str);
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244 vsnprintf(saCmdResultErrMsg, sizeof(saCmdResultErrMsg), str, varargs);
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245 va_end(varargs);
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246 saCmdResult = -1;
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247 saCmdPending = 0;
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248 }
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249
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250 static bool
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251 packageNameMatches(char* clazzName, char* pkg) {
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252 int pkgLen = strlen(pkg);
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253 int clazzNameLen = strlen(clazzName);
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254
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255 if (pkgLen >= clazzNameLen + 1) {
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256 return false;
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257 }
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258
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259 if (strncmp(clazzName, pkg, pkgLen)) {
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260 return false;
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261 }
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262
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263 // Ensure that '/' is the next character if non-empty package name
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264 int l = pkgLen;
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265 if (l > 0) {
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266 if (clazzName[l] != '/') {
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267 return false;
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268 }
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269 l++;
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270 }
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271 // Ensure that there are no more trailing slashes
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272 while (l < clazzNameLen) {
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273 if (clazzName[l++] == '/') {
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274 return false;
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275 }
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276 }
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277 return true;
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278 }
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279
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280 static void
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281 executeOneCommand(JNIEnv* env) {
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282 switch (saCmdType) {
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283 case SA_CMD_SUSPEND_ALL: {
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284 if (suspended) {
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285 reportErrorToSA("Target process already suspended");
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286 return;
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287 }
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288
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289 // We implement this by getting all of the threads and calling
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290 // SuspendThread on each one, except for the thread object
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291 // corresponding to this thread. Each thread for which the call
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292 // succeeded (i.e., did not return JVMDI_ERROR_INVALID_THREAD)
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293 // is added to a list which is remembered for later resumption.
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294 // Note that this currently has race conditions since a thread
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295 // might be started after we call GetAllThreads and since a
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296 // thread for which we got an error earlier might be resumed by
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297 // the VM while we are busy suspending other threads. We could
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298 // solve this by looping until there are no more threads we can
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299 // suspend, but a more robust and scalable solution is to add
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300 // this functionality to the JVMDI interface (i.e.,
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301 // "suspendAll"). Probably need to provide an exclude list for
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302 // such a routine.
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303 jint threadCount;
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304 jthread* threads;
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305 if (jvmdi->GetAllThreads(&threadCount, &threads) != JVMDI_ERROR_NONE) {
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306 reportErrorToSA("Error while getting thread list");
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307 return;
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308 }
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309
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310
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311 for (int i = 0; i < threadCount; i++) {
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312 jthread thr = threads[i];
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313 if (!env->IsSameObject(thr, debugThreadObj)) {
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314 jvmdiError err = jvmdi->SuspendThread(thr);
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315 if (err == JVMDI_ERROR_NONE) {
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316 // Remember this thread and do not free it
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317 suspendedThreads.push_back(thr);
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318 continue;
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319 } else {
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320 fprintf(stderr, " SA: Error %d while suspending thread\n", err);
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321 // FIXME: stop, resume all threads, report error
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322 }
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323 }
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324 env->DeleteGlobalRef(thr);
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325 }
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326
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327 // Free up threads
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328 jvmdi->Deallocate((jbyte*) threads);
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329
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330 // Suspension is complete
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331 suspended = true;
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332 break;
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333 }
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334
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335 case SA_CMD_RESUME_ALL: {
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336 if (!suspended) {
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337 reportErrorToSA("Target process already suspended");
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338 return;
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339 }
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340
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341 saCmdResult = 0;
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342 bool errorOccurred = false;
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343 jvmdiError firstError;
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344 for (int i = 0; i < suspendedThreads.size(); i++) {
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345 jthread thr = suspendedThreads[i];
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346 jvmdiError err = jvmdi->ResumeThread(thr);
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347 env->DeleteGlobalRef(thr);
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348 if (err != JVMDI_ERROR_NONE) {
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349 if (!errorOccurred) {
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350 errorOccurred = true;
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351 firstError = err;
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352 }
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353 }
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354 }
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355 suspendedThreads.clear();
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356 suspended = false;
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357 if (errorOccurred) {
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358 reportErrorToSA("Error %d while resuming threads", firstError);
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359 return;
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360 }
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361 break;
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362 }
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363
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364 case SA_CMD_TOGGLE_BREAKPOINT: {
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365 saCmdBkptResWasError = 1;
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366
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367 // Search line number info for all loaded classes
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368 jint classCount;
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369 jclass* classes;
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370
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371 jvmdiError glcRes = jvmdi->GetLoadedClasses(&classCount, &classes);
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372 if (glcRes != JVMDI_ERROR_NONE) {
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373 reportErrorToSA("Error %d while getting loaded classes", glcRes);
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374 return;
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375 }
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376 JvmdiRefListDeallocator rld(env, (jobject*) classes, classCount);
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377
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378 bool done = false;
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379 bool gotOne = false;
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380 jclass targetClass;
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381 jmethodID targetMethod;
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382 jlocation targetLocation;
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383 jint targetLineNumber;
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384
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385 for (int i = 0; i < classCount && !done; i++) {
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386 fflush(stderr);
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387 jclass clazz = classes[i];
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388 char* srcName;
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389 jvmdiError sfnRes = jvmdi->GetSourceFileName(clazz, &srcName);
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390 if (sfnRes == JVMDI_ERROR_NONE) {
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391 JvmdiDeallocator de1(srcName);
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392 if (!strcmp(srcName, saCmdBkptSrcFileName)) {
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393 // Got a match. Now see whether the package name of the class also matches
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394 char* clazzName;
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395 jvmdiError sigRes = jvmdi->GetClassSignature(clazz, &clazzName);
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396 if (sigRes != JVMDI_ERROR_NONE) {
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397 reportErrorToSA("Error %d while getting a class's signature", sigRes);
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398 return;
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399 }
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400 JvmdiDeallocator de2(clazzName);
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401 if (packageNameMatches(clazzName + 1, saCmdBkptPkgName)) {
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402 // Iterate through all methods
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403 jint methodCount;
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404 jmethodID* methods;
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405 if (jvmdi->GetClassMethods(clazz, &methodCount, &methods) != JVMDI_ERROR_NONE) {
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406 reportErrorToSA("Error while getting methods of class %s", clazzName);
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407 return;
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408 }
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409 JvmdiDeallocator de3(methods);
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410 for (int j = 0; j < methodCount && !done; j++) {
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411 jmethodID m = methods[j];
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412 jint entryCount;
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413 JVMDI_line_number_entry* table;
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414 jvmdiError lnRes = jvmdi->GetLineNumberTable(clazz, m, &entryCount, &table);
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415 if (lnRes == JVMDI_ERROR_NONE) {
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416 JvmdiDeallocator de4(table);
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417 // Look for line number greater than or equal to requested line
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418 for (int k = 0; k < entryCount && !done; k++) {
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419 JVMDI_line_number_entry& entry = table[k];
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420 if (entry.line_number >= saCmdBkptLineNumber &&
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421 (!gotOne || entry.line_number < targetLineNumber)) {
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422 gotOne = true;
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423 targetClass = clazz;
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424 targetMethod = m;
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425 targetLocation = entry.start_location;
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426 targetLineNumber = entry.line_number;
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427 done = (targetLineNumber == saCmdBkptLineNumber);
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428 }
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429 }
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430 } else if (lnRes != JVMDI_ERROR_ABSENT_INFORMATION) {
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431 reportErrorToSA("Unexpected error %d while fetching line number table", lnRes);
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432 return;
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433 }
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434 }
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435 }
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436 }
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437 } else if (sfnRes != JVMDI_ERROR_ABSENT_INFORMATION) {
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438 reportErrorToSA("Unexpected error %d while fetching source file name", sfnRes);
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439 return;
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440 }
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441 }
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442
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443 bool wasSet = true;
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444 if (gotOne) {
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445 // Really toggle this breakpoint
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446 jvmdiError bpRes;
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447 bpRes = jvmdi->SetBreakpoint(targetClass, targetMethod, targetLocation);
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448 if (bpRes == JVMDI_ERROR_DUPLICATE) {
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449 bpRes = jvmdi->ClearBreakpoint(targetClass, targetMethod, targetLocation);
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450 wasSet = false;
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451 }
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452 if (bpRes != JVMDI_ERROR_NONE) {
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453 reportErrorToSA("Unexpected error %d while setting or clearing breakpoint at bci %d, line %d",
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454 bpRes, targetLocation, targetLineNumber);
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455 return;
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456 }
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457 } else {
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458 saCmdBkptResWasError = 0;
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459 reportErrorToSA("No debug information found covering this line");
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460 return;
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461 }
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462
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463 // Provide result
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464 saCmdBkptResLineNumber = targetLineNumber;
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465 saCmdBkptResBCI = targetLocation;
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466 saCmdBkptResWasSet = (wasSet ? 1 : 0);
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467 {
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468 char* methodName;
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469 char* methodSig;
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470 if (jvmdi->GetMethodName(targetClass, targetMethod, &methodName, &methodSig)
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471 == JVMDI_ERROR_NONE) {
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472 JvmdiDeallocator mnd(methodName);
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473 JvmdiDeallocator msd(methodSig);
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474 strncpy(saCmdBkptResMethodName, methodName, SA_CMD_BUF_SIZE);
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475 strncpy(saCmdBkptResMethodSig, methodSig, SA_CMD_BUF_SIZE);
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476 } else {
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477 strncpy(saCmdBkptResMethodName, "<error>", SA_CMD_BUF_SIZE);
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478 strncpy(saCmdBkptResMethodSig, "<error>", SA_CMD_BUF_SIZE);
|
|
479 }
|
|
480 }
|
|
481 break;
|
|
482 }
|
|
483
|
|
484 default:
|
|
485 reportErrorToSA("Command %d not yet supported", saCmdType);
|
|
486 return;
|
|
487 }
|
|
488
|
|
489 // Successful command execution
|
|
490 saCmdResult = 0;
|
|
491 saCmdPending = 0;
|
|
492 }
|
|
493
|
|
494 static void
|
|
495 saCommandThread(void *arg) {
|
|
496 JNIEnv* env = NULL;
|
|
497 if (jvm->GetEnv((void **) &env, JNI_VERSION_1_2) != JNI_OK) {
|
|
498 stop("Error while starting Serviceability Agent "
|
|
499 "command thread: could not get JNI environment");
|
|
500 }
|
|
501
|
|
502 while (1) {
|
|
503 // Wait for command
|
|
504 while (!saCmdPending) {
|
|
505 SLEEP();
|
|
506 }
|
|
507
|
|
508 executeOneCommand(env);
|
|
509 }
|
|
510 }
|
|
511
|
|
512 static void
|
|
513 saEventHook(JNIEnv *env, JVMDI_Event *event)
|
|
514 {
|
|
515 MonitorLocker ml(eventLock);
|
|
516
|
|
517 saEventKind = event->kind;
|
|
518
|
|
519 if (event->kind == JVMDI_EVENT_VM_INIT) {
|
|
520 // Create event lock
|
|
521 if (jvmdi->CreateRawMonitor("Serviceability Agent Event Lock", &eventLock)
|
|
522 != JVMDI_ERROR_NONE) {
|
|
523 stop("Unable to create Serviceability Agent's event lock");
|
|
524 }
|
|
525 // Start thread which receives commands from the SA.
|
|
526 jclass threadClass = env->FindClass("java/lang/Thread");
|
|
527 if (threadClass == NULL) stop("Unable to find class java/lang/Thread");
|
|
528 jstring threadName = env->NewStringUTF("Serviceability Agent Command Thread");
|
|
529 if (threadName == NULL) stop("Unable to allocate debug thread name");
|
|
530 jmethodID ctor = env->GetMethodID(threadClass, "<init>", "(Ljava/lang/String;)V");
|
|
531 if (ctor == NULL) stop("Unable to find appropriate constructor for java/lang/Thread");
|
|
532 // Allocate thread object
|
|
533 jthread thr = (jthread) env->NewObject(threadClass, ctor, threadName);
|
|
534 if (thr == NULL) stop("Unable to allocate debug thread's java/lang/Thread instance");
|
|
535 // Remember which thread this is
|
|
536 debugThreadObj = env->NewGlobalRef(thr);
|
|
537 if (debugThreadObj == NULL) stop("Unable to allocate global ref for debug thread object");
|
|
538 // Start thread
|
|
539 jvmdiError err;
|
|
540 if ((err = jvmdi->RunDebugThread(thr, &saCommandThread, NULL, JVMDI_THREAD_NORM_PRIORITY))
|
|
541 != JVMDI_ERROR_NONE) {
|
|
542 char buf[256];
|
|
543 sprintf(buf, "Error %d while starting debug thread", err);
|
|
544 stop(buf);
|
|
545 }
|
|
546 // OK, initialization is done
|
|
547 return;
|
|
548 }
|
|
549
|
|
550 if (!saAttached) {
|
|
551 return;
|
|
552 }
|
|
553
|
|
554 switch (event->kind) {
|
|
555 case JVMDI_EVENT_EXCEPTION: {
|
|
556 fprintf(stderr, "SA: Exception thrown -- ignoring\n");
|
|
557 saExceptionThread = event->u.exception.thread;
|
|
558 saExceptionClass = event->u.exception.clazz;
|
|
559 saExceptionMethod = event->u.exception.method;
|
|
560 saExceptionLocation = event->u.exception.location;
|
|
561 saExceptionException = event->u.exception.exception;
|
|
562 saExceptionCatchClass = event->u.exception.catch_clazz;
|
|
563 saExceptionCatchClass = event->u.exception.catch_clazz;
|
|
564 saExceptionCatchMethod = event->u.exception.catch_method;
|
|
565 saExceptionCatchLocation = event->u.exception.catch_location;
|
|
566 // saEventPending = 1;
|
|
567 break;
|
|
568 }
|
|
569
|
|
570 case JVMDI_EVENT_BREAKPOINT: {
|
|
571 saBreakpointThread = event->u.breakpoint.thread;
|
|
572 saBreakpointClass = event->u.breakpoint.clazz;
|
|
573 saBreakpointMethod = event->u.breakpoint.method;
|
|
574 saBreakpointLocation = event->u.breakpoint.location;
|
|
575 saEventPending = 1;
|
|
576 break;
|
|
577 }
|
|
578
|
|
579 default:
|
|
580 break;
|
|
581 }
|
|
582
|
|
583 while (saAttached && saEventPending) {
|
|
584 SLEEP();
|
|
585 }
|
|
586 }
|
|
587
|
|
588 extern "C" {
|
|
589 JNIEXPORT jint JNICALL
|
|
590 JVM_OnLoad(JavaVM *vm, char *options, void *reserved)
|
|
591 {
|
|
592 jvm = vm;
|
|
593 if (jvm->GetEnv((void**) &jvmdi, JVMDI_VERSION_1) != JNI_OK) {
|
|
594 return -1;
|
|
595 }
|
|
596 if (jvmdi->SetEventHook(&saEventHook) != JVMDI_ERROR_NONE) {
|
|
597 return -1;
|
|
598 }
|
|
599 return 0;
|
|
600 }
|
|
601 };
|