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0
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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/_forte.cpp.incl"
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27
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28
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29 //-------------------------------------------------------
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30
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31 // Native interfaces for use by Forte tools.
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32
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33
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34 #ifndef IA64
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35
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36 class vframeStreamForte : public vframeStreamCommon {
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37 public:
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38 // constructor that starts with sender of frame fr (top_frame)
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39 vframeStreamForte(JavaThread *jt, frame fr, bool stop_at_java_call_stub);
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40 void forte_next();
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41 };
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42
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43
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44 static void forte_is_walkable_compiled_frame(frame* fr, RegisterMap* map,
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45 bool* is_compiled_p, bool* is_walkable_p);
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46 static bool forte_is_walkable_interpreted_frame(frame* fr,
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47 methodOop* method_p, int* bci_p);
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48
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49
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50 // A Forte specific version of frame:safe_for_sender().
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51 static bool forte_safe_for_sender(frame* fr, JavaThread *thread) {
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52 bool ret_value = false; // be pessimistic
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53
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54 #ifdef COMPILER2
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55 #if defined(IA32) || defined(AMD64)
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56 {
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57 // This check is the same as the standard safe_for_sender()
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58 // on IA32 or AMD64 except that NULL FP values are tolerated
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59 // for C2.
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60 address sp = (address)fr->sp();
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61 address fp = (address)fr->fp();
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62 ret_value = sp != NULL && sp <= thread->stack_base() &&
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63 sp >= thread->stack_base() - thread->stack_size() &&
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64 (fp == NULL || (fp <= thread->stack_base() &&
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65 fp >= thread->stack_base() - thread->stack_size()));
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66
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67 // We used to use standard safe_for_sender() when we are supposed
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68 // to be executing Java code. However, that prevents us from
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69 // walking some intrinsic stacks so now we have to be more refined.
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70 // If we passed the above check and we have a NULL frame pointer
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71 // and we are supposed to be executing Java code, then we have a
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72 // couple of more checks to make.
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73 if (ret_value && fp == NULL && (thread->thread_state() == _thread_in_Java
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74 || thread->thread_state() == _thread_in_Java_trans)) {
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75
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76 if (fr->is_interpreted_frame()) {
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77 // interpreted frames don't really have a NULL frame pointer
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78 return false;
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79 } else if (CodeCache::find_blob(fr->pc()) == NULL) {
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80 // the NULL frame pointer should be associated with generated code
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81 return false;
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82 }
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83 }
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84 }
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85
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86 #else // !(IA32 || AMD64)
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87 ret_value = fr->safe_for_sender(thread);
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88 #endif // IA32 || AMD64
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89
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90 #else // !COMPILER2
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91 ret_value = fr->safe_for_sender(thread);
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92 #endif // COMPILER2
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93
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94 if (!ret_value) {
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95 return ret_value; // not safe, nothing more to do
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96 }
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97
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98 address sp1;
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99
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100 #ifdef SPARC
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101 // On Solaris SPARC, when a compiler frame has an interpreted callee
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102 // the _interpreter_sp_adjustment field contains the adjustment to
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103 // this frame's SP made by that interpreted callee.
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104 // For AsyncGetCallTrace(), we need to verify that the resulting SP
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105 // is valid for the specified thread's stack.
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106 sp1 = (address)fr->sp();
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107 address sp2 = (address)fr->unextended_sp();
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108
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109 // If the second SP is NULL, then the _interpreter_sp_adjustment
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110 // field simply adjusts this frame's SP to NULL and the frame is
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111 // not safe. This strange value can be set in the frame constructor
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112 // when our peek into the interpreted callee's adjusted value for
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113 // this frame's SP finds a NULL. This can happen when SIGPROF
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114 // catches us while we are creating the interpreter frame.
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115 //
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116 if (sp2 == NULL ||
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117
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118 // If the two SPs are different, then _interpreter_sp_adjustment
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119 // is non-zero and we need to validate the second SP. We invert
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120 // the range check from frame::safe_for_sender() and bail out
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121 // if the second SP is not safe.
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122 (sp1 != sp2 && !(sp2 <= thread->stack_base()
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123 && sp2 >= (thread->stack_base() - thread->stack_size())))) {
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124 return false;
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125 }
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126 #endif // SPARC
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127
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128 if (fr->is_entry_frame()) {
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129 // This frame thinks it is an entry frame; we need to validate
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130 // the JavaCallWrapper pointer.
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131 // Note: frame::entry_frame_is_first() assumes that the
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132 // JavaCallWrapper has a non-NULL _anchor field. We don't
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133 // check that here (yet) since we've never seen a failure
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134 // due to a NULL _anchor field.
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135 // Update: Originally this check was done only for SPARC. However,
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136 // this failure has now been seen on C2 C86. I have no reason to
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137 // believe that this is not a general issue so I'm enabling the
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138 // check for all compilers on all supported platforms.
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139 #ifdef COMPILER2
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140 #if defined(IA32) || defined(AMD64)
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141 if (fr->fp() == NULL) {
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142 // C2 X86 allows NULL frame pointers, but if we have one then
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143 // we cannot call entry_frame_call_wrapper().
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144 return false;
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145 }
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146 #endif // IA32 || AMD64
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147 #endif // COMPILER2
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148
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149 sp1 = (address)fr->entry_frame_call_wrapper();
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150 // We invert the range check from frame::safe_for_sender() and
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151 // bail out if the JavaCallWrapper * is not safe.
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152 if (!(sp1 <= thread->stack_base()
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153 && sp1 >= (thread->stack_base() - thread->stack_size()))) {
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154 return false;
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155 }
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156 }
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157
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158 return ret_value;
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159 }
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160
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161
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162 // Unknown compiled frames have caused assertion failures on Solaris
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163 // X86. This code also detects unknown compiled frames on Solaris
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164 // SPARC, but no assertion failures have been observed. However, I'm
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165 // paranoid so I'm enabling this code whenever we have a compiler.
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166 //
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167 // Returns true if the specified frame is an unknown compiled frame
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168 // and false otherwise.
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169 static bool is_unknown_compiled_frame(frame* fr, JavaThread *thread) {
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170 bool ret_value = false; // be optimistic
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171
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172 // This failure mode only occurs when the thread is in state
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173 // _thread_in_Java so we are okay for this check for any other
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174 // thread state.
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175 //
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176 // Note: _thread_in_Java does not always mean that the thread
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177 // is executing Java code. AsyncGetCallTrace() has caught
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178 // threads executing in JRT_LEAF() routines when the state
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179 // will also be _thread_in_Java.
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180 if (thread->thread_state() != _thread_in_Java) {
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181 return ret_value;
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182 }
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183
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184 // This failure mode only occurs with compiled frames so we are
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185 // okay for this check for both entry and interpreted frames.
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186 if (fr->is_entry_frame() || fr->is_interpreted_frame()) {
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187 return ret_value;
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188 }
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189
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190 // This failure mode only occurs when the compiled frame's PC
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191 // is in the code cache so we are okay for this check if the
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192 // PC is not in the code cache.
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193 CodeBlob* cb = CodeCache::find_blob(fr->pc());
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194 if (cb == NULL) {
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195 return ret_value;
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196 }
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197
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198 // We have compiled code in the code cache so it is time for
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199 // the final check: let's see if any frame type is set
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200 ret_value = !(
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201 // is_entry_frame() is checked above
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202 // testers that are a subset of is_entry_frame():
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203 // is_first_frame()
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204 fr->is_java_frame()
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205 // testers that are a subset of is_java_frame():
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206 // is_interpreted_frame()
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207 // is_compiled_frame()
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208 || fr->is_native_frame()
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209 || fr->is_runtime_frame()
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210 || fr->is_safepoint_blob_frame()
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211 );
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212
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213 // If there is no frame type set, then we have an unknown compiled
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214 // frame and sender() should not be called on it.
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215
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216 return ret_value;
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217 }
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218
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219 #define DebugNonSafepoints_IS_CLEARED \
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220 (!FLAG_IS_DEFAULT(DebugNonSafepoints) && !DebugNonSafepoints)
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221
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222 // if -XX:-DebugNonSafepoints, then top-frame will be skipped
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223 vframeStreamForte::vframeStreamForte(JavaThread *jt, frame fr,
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224 bool stop_at_java_call_stub) : vframeStreamCommon(jt) {
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225 _stop_at_java_call_stub = stop_at_java_call_stub;
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226
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227 if (!DebugNonSafepoints_IS_CLEARED) {
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228 // decode the top frame fully
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229 // (usual case, if JVMTI is enabled)
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230 _frame = fr;
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231 } else {
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232 // skip top frame, as it may not be at safepoint
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233 // For AsyncGetCallTrace(), we extracted as much info from the top
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234 // frame as we could in forte_is_walkable_frame(). We also verified
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235 // forte_safe_for_sender() so this sender() call is safe.
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236 _frame = fr.sender(&_reg_map);
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237 }
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238
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239 if (jt->thread_state() == _thread_in_Java && !fr.is_first_frame()) {
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240 bool sender_check = false; // assume sender is not safe
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241
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242 if (forte_safe_for_sender(&_frame, jt)) {
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243 // If the initial sender frame is safe, then continue on with other
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244 // checks. The unsafe sender frame has been seen on Solaris X86
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245 // with both Compiler1 and Compiler2. It has not been seen on
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246 // Solaris SPARC, but seems like a good sanity check to have
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247 // anyway.
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248
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249 // SIGPROF caught us in Java code and the current frame is not the
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250 // first frame so we should sanity check the sender frame. It is
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251 // possible for SIGPROF to catch us in the middle of making a call.
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252 // When that happens the current frame is actually a combination of
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253 // the real sender and some of the new call's info. We can't find
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254 // the real sender with such a current frame and things can get
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255 // confused.
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256 //
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257 // This sanity check has caught problems with the sender frame on
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258 // Solaris SPARC. So far Solaris X86 has not had a failure here.
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259 sender_check = _frame.is_entry_frame()
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260 // testers that are a subset of is_entry_frame():
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261 // is_first_frame()
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262 || _frame.is_java_frame()
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263 // testers that are a subset of is_java_frame():
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264 // is_interpreted_frame()
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265 // is_compiled_frame()
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266 || _frame.is_native_frame()
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267 || _frame.is_runtime_frame()
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268 || _frame.is_safepoint_blob_frame()
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269 ;
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270
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271 // We need an additional sanity check on an initial interpreted
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272 // sender frame. This interpreted frame needs to be both walkable
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273 // and have a valid BCI. This is yet another variant of SIGPROF
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274 // catching us in the middle of making a call.
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275 if (sender_check && _frame.is_interpreted_frame()) {
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276 methodOop method = NULL;
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277 int bci = -1;
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278
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279 if (!forte_is_walkable_interpreted_frame(&_frame, &method, &bci)
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280 || bci == -1) {
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281 sender_check = false;
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282 }
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283 }
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284
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285 // We need an additional sanity check on an initial compiled
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286 // sender frame. This compiled frame also needs to be walkable.
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287 // This is yet another variant of SIGPROF catching us in the
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288 // middle of making a call.
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289 if (sender_check && !_frame.is_interpreted_frame()) {
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290 bool is_compiled, is_walkable;
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291
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292 forte_is_walkable_compiled_frame(&_frame, &_reg_map,
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293 &is_compiled, &is_walkable);
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294 if (is_compiled && !is_walkable) {
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295 sender_check = false;
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296 }
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297 }
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298 }
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299
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300 if (!sender_check) {
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301 // nothing else to try if we can't recognize the sender
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302 _mode = at_end_mode;
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303 return;
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304 }
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305 }
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306
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307 int loop_count = 0;
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308 int loop_max = MaxJavaStackTraceDepth * 2;
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309
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310 while (!fill_from_frame()) {
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311 _frame = _frame.sender(&_reg_map);
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312
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313 #ifdef COMPILER2
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314 #if defined(IA32) || defined(AMD64)
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315 // Stress testing on C2 X86 has shown a periodic problem with
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316 // the sender() call below. The initial _frame that we have on
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317 // entry to the loop has already passed forte_safe_for_sender()
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318 // so we only check frames after it.
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319 if (!forte_safe_for_sender(&_frame, _thread)) {
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320 _mode = at_end_mode;
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321 return;
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322 }
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323 #endif // IA32 || AMD64
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324 #endif // COMPILER2
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325
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326 if (++loop_count >= loop_max) {
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327 // We have looped more than twice the number of possible
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328 // Java frames. This indicates that we are trying to walk
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329 // a stack that is in the middle of being constructed and
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330 // it is self referential.
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331 _mode = at_end_mode;
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332 return;
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333 }
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334 }
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335 }
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336
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337
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338 // Solaris SPARC Compiler1 needs an additional check on the grandparent
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339 // of the top_frame when the parent of the top_frame is interpreted and
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340 // the grandparent is compiled. However, in this method we do not know
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341 // the relationship of the current _frame relative to the top_frame so
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342 // we implement a more broad sanity check. When the previous callee is
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343 // interpreted and the current sender is compiled, we verify that the
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344 // current sender is also walkable. If it is not walkable, then we mark
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345 // the current vframeStream as at the end.
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346 void vframeStreamForte::forte_next() {
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347 // handle frames with inlining
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348 if (_mode == compiled_mode &&
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349 vframeStreamCommon::fill_in_compiled_inlined_sender()) {
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350 return;
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351 }
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352
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353 // handle general case
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354
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355 int loop_count = 0;
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356 int loop_max = MaxJavaStackTraceDepth * 2;
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357
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358
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359 do {
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360
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361 #if defined(COMPILER1) && defined(SPARC)
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362 bool prevIsInterpreted = _frame.is_interpreted_frame();
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363 #endif // COMPILER1 && SPARC
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364
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365 _frame = _frame.sender(&_reg_map);
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366
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367 if (!forte_safe_for_sender(&_frame, _thread)) {
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368 _mode = at_end_mode;
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369 return;
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370 }
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371
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372 #if defined(COMPILER1) && defined(SPARC)
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373 if (prevIsInterpreted) {
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374 // previous callee was interpreted and may require a special check
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375 if (_frame.is_compiled_frame() && _frame.cb()->is_compiled_by_c1()) {
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376 // compiled sender called interpreted callee so need one more check
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377 bool is_compiled, is_walkable;
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378
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379 // sanity check the compiled sender frame
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380 forte_is_walkable_compiled_frame(&_frame, &_reg_map,
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381 &is_compiled, &is_walkable);
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382 assert(is_compiled, "sanity check");
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383 if (!is_walkable) {
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384 // compiled sender frame is not walkable so bail out
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385 _mode = at_end_mode;
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386 return;
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387 }
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388 }
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389 }
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390 #endif // COMPILER1 && SPARC
|
|
|
391
|
|
|
392 if (++loop_count >= loop_max) {
|
|
|
393 // We have looped more than twice the number of possible
|
|
|
394 // Java frames. This indicates that we are trying to walk
|
|
|
395 // a stack that is in the middle of being constructed and
|
|
|
396 // it is self referential.
|
|
|
397 _mode = at_end_mode;
|
|
|
398 return;
|
|
|
399 }
|
|
|
400 } while (!fill_from_frame());
|
|
|
401 }
|
|
|
402
|
|
|
403 // Determine if 'fr' is a walkable, compiled frame.
|
|
|
404 // *is_compiled_p is set to true if the frame is compiled and if it
|
|
|
405 // is, then *is_walkable_p is set to true if it is also walkable.
|
|
|
406 static void forte_is_walkable_compiled_frame(frame* fr, RegisterMap* map,
|
|
|
407 bool* is_compiled_p, bool* is_walkable_p) {
|
|
|
408
|
|
|
409 *is_compiled_p = false;
|
|
|
410 *is_walkable_p = false;
|
|
|
411
|
|
|
412 CodeBlob* cb = CodeCache::find_blob(fr->pc());
|
|
|
413 if (cb != NULL &&
|
|
|
414 cb->is_nmethod() &&
|
|
|
415 ((nmethod*)cb)->is_java_method()) {
|
|
|
416 // frame is compiled and executing a Java method
|
|
|
417 *is_compiled_p = true;
|
|
|
418
|
|
|
419 // Increment PC because the PcDesc we want is associated with
|
|
|
420 // the *end* of the instruction, and pc_desc_near searches
|
|
|
421 // forward to the first matching PC after the probe PC.
|
|
|
422 PcDesc* pc_desc = NULL;
|
|
|
423 if (!DebugNonSafepoints_IS_CLEARED) {
|
|
|
424 // usual case: look for any safepoint near the sampled PC
|
|
|
425 address probe_pc = fr->pc() + 1;
|
|
|
426 pc_desc = ((nmethod*) cb)->pc_desc_near(probe_pc);
|
|
|
427 } else {
|
|
|
428 // reduced functionality: only recognize PCs immediately after calls
|
|
|
429 pc_desc = ((nmethod*) cb)->pc_desc_at(fr->pc());
|
|
|
430 }
|
|
|
431 if (pc_desc != NULL && (pc_desc->scope_decode_offset()
|
|
|
432 == DebugInformationRecorder::serialized_null)) {
|
|
|
433 pc_desc = NULL;
|
|
|
434 }
|
|
|
435 if (pc_desc != NULL) {
|
|
|
436 // it has a PcDesc so the frame is also walkable
|
|
|
437 *is_walkable_p = true;
|
|
|
438 if (!DebugNonSafepoints_IS_CLEARED) {
|
|
|
439 // Normalize the PC to the one associated exactly with
|
|
|
440 // this PcDesc, so that subsequent stack-walking queries
|
|
|
441 // need not be approximate:
|
|
|
442 fr->set_pc(pc_desc->real_pc((nmethod*) cb));
|
|
|
443 }
|
|
|
444 }
|
|
|
445 // Implied else: this compiled frame has no PcDesc, i.e., contains
|
|
|
446 // a frameless stub such as C1 method exit, so it is not walkable.
|
|
|
447 }
|
|
|
448 // Implied else: this isn't a compiled frame so it isn't a
|
|
|
449 // walkable, compiled frame.
|
|
|
450 }
|
|
|
451
|
|
|
452 // Determine if 'fr' is a walkable interpreted frame. Returns false
|
|
|
453 // if it is not. *method_p, and *bci_p are not set when false is
|
|
|
454 // returned. *method_p is non-NULL if frame was executing a Java
|
|
|
455 // method. *bci_p is != -1 if a valid BCI in the Java method could
|
|
|
456 // be found.
|
|
|
457 // Note: this method returns true when a valid Java method is found
|
|
|
458 // even if a valid BCI cannot be found.
|
|
|
459
|
|
|
460 static bool forte_is_walkable_interpreted_frame(frame* fr,
|
|
|
461 methodOop* method_p, int* bci_p) {
|
|
|
462 assert(fr->is_interpreted_frame(), "just checking");
|
|
|
463
|
|
|
464 // top frame is an interpreted frame
|
|
|
465 // check if it is walkable (i.e. valid methodOop and valid bci)
|
|
|
466 if (fr->is_interpreted_frame_valid()) {
|
|
|
467 if (fr->fp() != NULL) {
|
|
|
468 // access address in order not to trigger asserts that
|
|
|
469 // are built in interpreter_frame_method function
|
|
|
470 methodOop method = *fr->interpreter_frame_method_addr();
|
|
|
471 if (Universe::heap()->is_valid_method(method)) {
|
|
|
472 intptr_t bcx = fr->interpreter_frame_bcx();
|
|
|
473 int bci = method->validate_bci_from_bcx(bcx);
|
|
|
474 // note: bci is set to -1 if not a valid bci
|
|
|
475 *method_p = method;
|
|
|
476 *bci_p = bci;
|
|
|
477 return true;
|
|
|
478 }
|
|
|
479 }
|
|
|
480 }
|
|
|
481 return false;
|
|
|
482 }
|
|
|
483
|
|
|
484
|
|
|
485 // Determine if 'fr' can be used to find a walkable frame. Returns
|
|
|
486 // false if a walkable frame cannot be found. *walkframe_p, *method_p,
|
|
|
487 // and *bci_p are not set when false is returned. Returns true if a
|
|
|
488 // walkable frame is returned via *walkframe_p. *method_p is non-NULL
|
|
|
489 // if the returned frame was executing a Java method. *bci_p is != -1
|
|
|
490 // if a valid BCI in the Java method could be found.
|
|
|
491 //
|
|
|
492 // *walkframe_p will be used by vframeStreamForte as the initial
|
|
|
493 // frame for walking the stack. Currently the initial frame is
|
|
|
494 // skipped by vframeStreamForte because we inherited the logic from
|
|
|
495 // the vframeStream class. This needs to be revisited in the future.
|
|
|
496 static bool forte_is_walkable_frame(JavaThread* thread, frame* fr,
|
|
|
497 frame* walkframe_p, methodOop* method_p, int* bci_p) {
|
|
|
498
|
|
|
499 if (!forte_safe_for_sender(fr, thread)
|
|
|
500 || is_unknown_compiled_frame(fr, thread)
|
|
|
501 ) {
|
|
|
502 // If the initial frame is not safe, then bail out. So far this
|
|
|
503 // has only been seen on Solaris X86 with Compiler2, but it seems
|
|
|
504 // like a great initial sanity check.
|
|
|
505 return false;
|
|
|
506 }
|
|
|
507
|
|
|
508 if (fr->is_first_frame()) {
|
|
|
509 // If initial frame is frame from StubGenerator and there is no
|
|
|
510 // previous anchor, there are no java frames yet
|
|
|
511 return false;
|
|
|
512 }
|
|
|
513
|
|
|
514 if (fr->is_interpreted_frame()) {
|
|
|
515 if (forte_is_walkable_interpreted_frame(fr, method_p, bci_p)) {
|
|
|
516 *walkframe_p = *fr;
|
|
|
517 return true;
|
|
|
518 }
|
|
|
519 return false;
|
|
|
520 }
|
|
|
521
|
|
|
522 // At this point we have something other than a first frame or an
|
|
|
523 // interpreted frame.
|
|
|
524
|
|
|
525 methodOop method = NULL;
|
|
|
526 frame candidate = *fr;
|
|
|
527
|
|
|
528 // If we loop more than twice the number of possible Java
|
|
|
529 // frames, then this indicates that we are trying to walk
|
|
|
530 // a stack that is in the middle of being constructed and
|
|
|
531 // it is self referential. So far this problem has only
|
|
|
532 // been seen on Solaris X86 Compiler2, but it seems like
|
|
|
533 // a good robustness fix for all platforms.
|
|
|
534
|
|
|
535 int loop_count;
|
|
|
536 int loop_max = MaxJavaStackTraceDepth * 2;
|
|
|
537
|
|
|
538 for (loop_count = 0; loop_count < loop_max; loop_count++) {
|
|
|
539 // determine if the candidate frame is executing a Java method
|
|
|
540 if (CodeCache::contains(candidate.pc())) {
|
|
|
541 // candidate is a compiled frame or stub routine
|
|
|
542 CodeBlob* cb = CodeCache::find_blob(candidate.pc());
|
|
|
543
|
|
|
544 if (cb->is_nmethod()) {
|
|
|
545 method = ((nmethod *)cb)->method();
|
|
|
546 }
|
|
|
547 } // end if CodeCache has our PC
|
|
|
548
|
|
|
549 RegisterMap map(thread, false);
|
|
|
550
|
|
|
551 // we have a Java frame that seems reasonable
|
|
|
552 if (method != NULL && candidate.is_java_frame()
|
|
|
553 && candidate.sp() != NULL && candidate.pc() != NULL) {
|
|
|
554 // we need to sanity check the candidate further
|
|
|
555 bool is_compiled, is_walkable;
|
|
|
556
|
|
|
557 forte_is_walkable_compiled_frame(&candidate, &map, &is_compiled,
|
|
|
558 &is_walkable);
|
|
|
559 if (is_compiled) {
|
|
|
560 // At this point, we know we have a compiled Java frame with
|
|
|
561 // method information that we want to return. We don't check
|
|
|
562 // the is_walkable flag here because that flag pertains to
|
|
|
563 // vframeStreamForte work that is done after we are done here.
|
|
|
564 break;
|
|
|
565 }
|
|
|
566 }
|
|
|
567
|
|
|
568 // At this point, the candidate doesn't work so try the sender.
|
|
|
569
|
|
|
570 // For AsyncGetCallTrace() we cannot assume there is a sender
|
|
|
571 // for the initial frame. The initial forte_safe_for_sender() call
|
|
|
572 // and check for is_first_frame() is done on entry to this method.
|
|
|
573 candidate = candidate.sender(&map);
|
|
|
574 if (!forte_safe_for_sender(&candidate, thread)) {
|
|
|
575
|
|
|
576 #ifdef COMPILER2
|
|
|
577 #if defined(IA32) || defined(AMD64)
|
|
|
578 // C2 on X86 can use the ebp register as a general purpose register
|
|
|
579 // which can cause the candidate to fail theforte_safe_for_sender()
|
|
|
580 // above. We try one more time using a NULL frame pointer (fp).
|
|
|
581
|
|
|
582 candidate = frame(candidate.sp(), NULL, candidate.pc());
|
|
|
583 if (!forte_safe_for_sender(&candidate, thread)) {
|
|
|
584 #endif // IA32 || AMD64
|
|
|
585 #endif // COMPILER2
|
|
|
586
|
|
|
587 return false;
|
|
|
588
|
|
|
589 #ifdef COMPILER2
|
|
|
590 #if defined(IA32) || defined(AMD64)
|
|
|
591 } // end forte_safe_for_sender retry with NULL fp
|
|
|
592 #endif // IA32 || AMD64
|
|
|
593 #endif // COMPILER2
|
|
|
594
|
|
|
595 } // end first forte_safe_for_sender check
|
|
|
596
|
|
|
597 if (candidate.is_first_frame()
|
|
|
598 || is_unknown_compiled_frame(&candidate, thread)) {
|
|
|
599 return false;
|
|
|
600 }
|
|
|
601 } // end for loop_count
|
|
|
602
|
|
|
603 if (method == NULL) {
|
|
|
604 // If we didn't get any method info from the candidate, then
|
|
|
605 // we have nothing to return so bail out.
|
|
|
606 return false;
|
|
|
607 }
|
|
|
608
|
|
|
609 *walkframe_p = candidate;
|
|
|
610 *method_p = method;
|
|
|
611 *bci_p = -1;
|
|
|
612 return true;
|
|
|
613 }
|
|
|
614
|
|
|
615
|
|
|
616 // call frame copied from old .h file and renamed
|
|
|
617 typedef struct {
|
|
|
618 jint lineno; // line number in the source file
|
|
|
619 jmethodID method_id; // method executed in this frame
|
|
|
620 } ASGCT_CallFrame;
|
|
|
621
|
|
|
622 // call trace copied from old .h file and renamed
|
|
|
623 typedef struct {
|
|
|
624 JNIEnv *env_id; // Env where trace was recorded
|
|
|
625 jint num_frames; // number of frames in this trace
|
|
|
626 ASGCT_CallFrame *frames; // frames
|
|
|
627 } ASGCT_CallTrace;
|
|
|
628
|
|
|
629 static void forte_fill_call_trace_given_top(JavaThread* thd,
|
|
|
630 ASGCT_CallTrace* trace, int depth, frame top_frame) {
|
|
|
631 NoHandleMark nhm;
|
|
|
632
|
|
|
633 frame walkframe;
|
|
|
634 methodOop method;
|
|
|
635 int bci;
|
|
|
636 int count;
|
|
|
637
|
|
|
638 count = 0;
|
|
|
639 assert(trace->frames != NULL, "trace->frames must be non-NULL");
|
|
|
640
|
|
|
641 if (!forte_is_walkable_frame(thd, &top_frame, &walkframe, &method, &bci)) {
|
|
|
642 // return if no walkable frame is found
|
|
|
643 return;
|
|
|
644 }
|
|
|
645
|
|
|
646 CollectedHeap* ch = Universe::heap();
|
|
|
647
|
|
|
648 if (method != NULL) {
|
|
|
649 // The method is not stored GC safe so see if GC became active
|
|
|
650 // after we entered AsyncGetCallTrace() and before we try to
|
|
|
651 // use the methodOop.
|
|
|
652 // Yes, there is still a window after this check and before
|
|
|
653 // we use methodOop below, but we can't lock out GC so that
|
|
|
654 // has to be an acceptable risk.
|
|
|
655 if (!ch->is_valid_method(method)) {
|
|
|
656 trace->num_frames = -2;
|
|
|
657 return;
|
|
|
658 }
|
|
|
659
|
|
|
660 if (DebugNonSafepoints_IS_CLEARED) {
|
|
|
661 // Take whatever method the top-frame decoder managed to scrape up.
|
|
|
662 // We look further at the top frame only if non-safepoint
|
|
|
663 // debugging information is available.
|
|
|
664 count++;
|
|
|
665 trace->num_frames = count;
|
|
|
666 trace->frames[0].method_id = method->find_jmethod_id_or_null();
|
|
|
667 if (!method->is_native()) {
|
|
|
668 trace->frames[0].lineno = bci;
|
|
|
669 } else {
|
|
|
670 trace->frames[0].lineno = -3;
|
|
|
671 }
|
|
|
672 }
|
|
|
673 }
|
|
|
674
|
|
|
675 // check has_last_Java_frame() after looking at the top frame
|
|
|
676 // which may be an interpreted Java frame.
|
|
|
677 if (!thd->has_last_Java_frame() && method == NULL) {
|
|
|
678 trace->num_frames = 0;
|
|
|
679 return;
|
|
|
680 }
|
|
|
681
|
|
|
682 vframeStreamForte st(thd, walkframe, false);
|
|
|
683 for (; !st.at_end() && count < depth; st.forte_next(), count++) {
|
|
|
684 bci = st.bci();
|
|
|
685 method = st.method();
|
|
|
686
|
|
|
687 // The method is not stored GC safe so see if GC became active
|
|
|
688 // after we entered AsyncGetCallTrace() and before we try to
|
|
|
689 // use the methodOop.
|
|
|
690 // Yes, there is still a window after this check and before
|
|
|
691 // we use methodOop below, but we can't lock out GC so that
|
|
|
692 // has to be an acceptable risk.
|
|
|
693 if (!ch->is_valid_method(method)) {
|
|
|
694 // we throw away everything we've gathered in this sample since
|
|
|
695 // none of it is safe
|
|
|
696 trace->num_frames = -2;
|
|
|
697 return;
|
|
|
698 }
|
|
|
699
|
|
|
700 trace->frames[count].method_id = method->find_jmethod_id_or_null();
|
|
|
701 if (!method->is_native()) {
|
|
|
702 trace->frames[count].lineno = bci;
|
|
|
703 } else {
|
|
|
704 trace->frames[count].lineno = -3;
|
|
|
705 }
|
|
|
706 }
|
|
|
707 trace->num_frames = count;
|
|
|
708 return;
|
|
|
709 }
|
|
|
710
|
|
|
711
|
|
|
712 // Forte Analyzer AsyncGetCallTrace() entry point. Currently supported
|
|
|
713 // on Linux X86, Solaris SPARC and Solaris X86.
|
|
|
714 //
|
|
|
715 // Async-safe version of GetCallTrace being called from a signal handler
|
|
|
716 // when a LWP gets interrupted by SIGPROF but the stack traces are filled
|
|
|
717 // with different content (see below).
|
|
|
718 //
|
|
|
719 // This function must only be called when JVM/TI
|
|
|
720 // CLASS_LOAD events have been enabled since agent startup. The enabled
|
|
|
721 // event will cause the jmethodIDs to be allocated at class load time.
|
|
|
722 // The jmethodIDs cannot be allocated in a signal handler because locks
|
|
|
723 // cannot be grabbed in a signal handler safely.
|
|
|
724 //
|
|
|
725 // void (*AsyncGetCallTrace)(ASGCT_CallTrace *trace, jint depth, void* ucontext)
|
|
|
726 //
|
|
|
727 // Called by the profiler to obtain the current method call stack trace for
|
|
|
728 // a given thread. The thread is identified by the env_id field in the
|
|
|
729 // ASGCT_CallTrace structure. The profiler agent should allocate a ASGCT_CallTrace
|
|
|
730 // structure with enough memory for the requested stack depth. The VM fills in
|
|
|
731 // the frames buffer and the num_frames field.
|
|
|
732 //
|
|
|
733 // Arguments:
|
|
|
734 //
|
|
|
735 // trace - trace data structure to be filled by the VM.
|
|
|
736 // depth - depth of the call stack trace.
|
|
|
737 // ucontext - ucontext_t of the LWP
|
|
|
738 //
|
|
|
739 // ASGCT_CallTrace:
|
|
|
740 // typedef struct {
|
|
|
741 // JNIEnv *env_id;
|
|
|
742 // jint num_frames;
|
|
|
743 // ASGCT_CallFrame *frames;
|
|
|
744 // } ASGCT_CallTrace;
|
|
|
745 //
|
|
|
746 // Fields:
|
|
|
747 // env_id - ID of thread which executed this trace.
|
|
|
748 // num_frames - number of frames in the trace.
|
|
|
749 // (< 0 indicates the frame is not walkable).
|
|
|
750 // frames - the ASGCT_CallFrames that make up this trace. Callee followed by callers.
|
|
|
751 //
|
|
|
752 // ASGCT_CallFrame:
|
|
|
753 // typedef struct {
|
|
|
754 // jint lineno;
|
|
|
755 // jmethodID method_id;
|
|
|
756 // } ASGCT_CallFrame;
|
|
|
757 //
|
|
|
758 // Fields:
|
|
|
759 // 1) For Java frame (interpreted and compiled),
|
|
|
760 // lineno - bci of the method being executed or -1 if bci is not available
|
|
|
761 // method_id - jmethodID of the method being executed
|
|
|
762 // 2) For native method
|
|
|
763 // lineno - (-3)
|
|
|
764 // method_id - jmethodID of the method being executed
|
|
|
765
|
|
|
766 extern "C" {
|
|
|
767 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) {
|
|
|
768 if (SafepointSynchronize::is_synchronizing()) {
|
|
|
769 // The safepoint mechanism is trying to synchronize all the threads.
|
|
|
770 // Since this can involve thread suspension, it is not safe for us
|
|
|
771 // to be here. We can reduce the deadlock risk window by quickly
|
|
|
772 // returning to the SIGPROF handler. However, it is still possible
|
|
|
773 // for VMThread to catch us here or in the SIGPROF handler. If we
|
|
|
774 // are suspended while holding a resource and another thread blocks
|
|
|
775 // on that resource in the SIGPROF handler, then we will have a
|
|
|
776 // three-thread deadlock (VMThread, this thread, the other thread).
|
|
|
777 trace->num_frames = -10;
|
|
|
778 return;
|
|
|
779 }
|
|
|
780
|
|
|
781 JavaThread* thread;
|
|
|
782
|
|
|
783 if (trace->env_id == NULL ||
|
|
|
784 (thread = JavaThread::thread_from_jni_environment(trace->env_id)) == NULL ||
|
|
|
785 thread->is_exiting()) {
|
|
|
786
|
|
|
787 // bad env_id, thread has exited or thread is exiting
|
|
|
788 trace->num_frames = -8;
|
|
|
789 return;
|
|
|
790 }
|
|
|
791
|
|
|
792 if (thread->in_deopt_handler()) {
|
|
|
793 // thread is in the deoptimization handler so return no frames
|
|
|
794 trace->num_frames = -9;
|
|
|
795 return;
|
|
|
796 }
|
|
|
797
|
|
|
798 assert(JavaThread::current() == thread,
|
|
|
799 "AsyncGetCallTrace must be called by the current interrupted thread");
|
|
|
800
|
|
|
801 if (!JvmtiExport::should_post_class_load()) {
|
|
|
802 trace->num_frames = -1;
|
|
|
803 return;
|
|
|
804 }
|
|
|
805
|
|
|
806 if (Universe::heap()->is_gc_active()) {
|
|
|
807 trace->num_frames = -2;
|
|
|
808 return;
|
|
|
809 }
|
|
|
810
|
|
|
811 switch (thread->thread_state()) {
|
|
|
812 case _thread_new:
|
|
|
813 case _thread_uninitialized:
|
|
|
814 case _thread_new_trans:
|
|
|
815 // We found the thread on the threads list above, but it is too
|
|
|
816 // young to be useful so return that there are no Java frames.
|
|
|
817 trace->num_frames = 0;
|
|
|
818 break;
|
|
|
819 case _thread_in_native:
|
|
|
820 case _thread_in_native_trans:
|
|
|
821 case _thread_blocked:
|
|
|
822 case _thread_blocked_trans:
|
|
|
823 case _thread_in_vm:
|
|
|
824 case _thread_in_vm_trans:
|
|
|
825 {
|
|
|
826 frame fr;
|
|
|
827
|
|
|
828 // param isInJava == false - indicate we aren't in Java code
|
|
|
829 if (!thread->pd_get_top_frame_for_signal_handler(&fr, ucontext, false)) {
|
|
|
830 if (!thread->has_last_Java_frame()) {
|
|
|
831 trace->num_frames = 0; // no Java frames
|
|
|
832 } else {
|
|
|
833 trace->num_frames = -3; // unknown frame
|
|
|
834 }
|
|
|
835 } else {
|
|
|
836 trace->num_frames = -4; // non walkable frame by default
|
|
|
837 forte_fill_call_trace_given_top(thread, trace, depth, fr);
|
|
|
838 }
|
|
|
839 }
|
|
|
840 break;
|
|
|
841 case _thread_in_Java:
|
|
|
842 case _thread_in_Java_trans:
|
|
|
843 {
|
|
|
844 frame fr;
|
|
|
845
|
|
|
846 // param isInJava == true - indicate we are in Java code
|
|
|
847 if (!thread->pd_get_top_frame_for_signal_handler(&fr, ucontext, true)) {
|
|
|
848 trace->num_frames = -5; // unknown frame
|
|
|
849 } else {
|
|
|
850 trace->num_frames = -6; // non walkable frame by default
|
|
|
851 forte_fill_call_trace_given_top(thread, trace, depth, fr);
|
|
|
852 }
|
|
|
853 }
|
|
|
854 break;
|
|
|
855 default:
|
|
|
856 // Unknown thread state
|
|
|
857 trace->num_frames = -7;
|
|
|
858 break;
|
|
|
859 }
|
|
|
860 }
|
|
|
861
|
|
|
862
|
|
|
863 #ifndef _WINDOWS
|
|
|
864 // Support for the Forte(TM) Peformance Tools collector.
|
|
|
865 //
|
|
|
866 // The method prototype is derived from libcollector.h. For more
|
|
|
867 // information, please see the libcollect man page.
|
|
|
868
|
|
|
869 // Method to let libcollector know about a dynamically loaded function.
|
|
|
870 // Because it is weakly bound, the calls become NOP's when the library
|
|
|
871 // isn't present.
|
|
|
872 void collector_func_load(char* name,
|
|
|
873 void* null_argument_1,
|
|
|
874 void* null_argument_2,
|
|
|
875 void *vaddr,
|
|
|
876 int size,
|
|
|
877 int zero_argument,
|
|
|
878 void* null_argument_3);
|
|
|
879 #pragma weak collector_func_load
|
|
|
880 #define collector_func_load(x0,x1,x2,x3,x4,x5,x6) \
|
|
|
881 ( collector_func_load ? collector_func_load(x0,x1,x2,x3,x4,x5,x6),0 : 0 )
|
|
|
882 #endif // !_WINDOWS
|
|
|
883
|
|
|
884 } // end extern "C"
|
|
|
885 #endif // !IA64
|
|
|
886
|
|
|
887 void Forte::register_stub(const char* name, address start, address end) {
|
|
|
888 #if !defined(_WINDOWS) && !defined(IA64)
|
|
|
889 assert(pointer_delta(end, start, sizeof(jbyte)) < INT_MAX,
|
|
|
890 "Code size exceeds maximum range")
|
|
|
891
|
|
|
892 collector_func_load((char*)name, NULL, NULL, start,
|
|
|
893 pointer_delta(end, start, sizeof(jbyte)), 0, NULL);
|
|
|
894 #endif // !_WINDOWS && !IA64
|
|
|
895 }
|
