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0
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1 /*
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2 * Copyright 1998-2007 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/_exceptions.cpp.incl"
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27
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28
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29 // Implementation of ThreadShadow
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30 void check_ThreadShadow() {
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31 const ByteSize offset1 = byte_offset_of(ThreadShadow, _pending_exception);
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32 const ByteSize offset2 = Thread::pending_exception_offset();
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33 if (offset1 != offset2) fatal("ThreadShadow::_pending_exception is not positioned correctly");
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34 }
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35
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36
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37 void ThreadShadow::set_pending_exception(oop exception, const char* file, int line) {
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38 assert(exception != NULL && exception->is_oop(), "invalid exception oop");
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39 _pending_exception = exception;
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40 _exception_file = file;
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41 _exception_line = line;
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42 }
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43
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44 void ThreadShadow::clear_pending_exception() {
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45 if (TraceClearedExceptions) {
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46 if (_pending_exception != NULL) {
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47 tty->print_cr("Thread::clear_pending_exception: cleared exception:");
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48 _pending_exception->print();
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49 }
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50 }
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51 _pending_exception = NULL;
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52 _exception_file = NULL;
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53 _exception_line = 0;
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54 }
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55 // Implementation of Exceptions
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56
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57 bool Exceptions::special_exception(Thread* thread, const char* file, int line, Handle h_exception) {
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58 // bootstrapping check
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59 if (!Universe::is_fully_initialized()) {
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60 vm_exit_during_initialization(h_exception);
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61 ShouldNotReachHere();
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62 }
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63
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64 if (thread->is_VM_thread()
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65 || thread->is_Compiler_thread() ) {
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66 // We do not care what kind of exception we get for the vm-thread or a thread which
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67 // is compiling. We just install a dummy exception object
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68 thread->set_pending_exception(Universe::vm_exception(), file, line);
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69 return true;
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70 }
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71
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72 return false;
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73 }
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74
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75 bool Exceptions::special_exception(Thread* thread, const char* file, int line, symbolHandle h_name, const char* message) {
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76 // bootstrapping check
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77 if (!Universe::is_fully_initialized()) {
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78 if (h_name.is_null()) {
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79 // atleast an informative message.
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80 vm_exit_during_initialization("Exception", message);
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81 } else {
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82 vm_exit_during_initialization(h_name, message);
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83 }
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84 ShouldNotReachHere();
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85 }
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86
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87 if (thread->is_VM_thread()
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88 || thread->is_Compiler_thread() ) {
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89 // We do not care what kind of exception we get for the vm-thread or a thread which
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90 // is compiling. We just install a dummy exception object
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91 thread->set_pending_exception(Universe::vm_exception(), file, line);
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92 return true;
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93 }
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94
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95 return false;
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96 }
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97
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98 // This method should only be called from generated code,
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99 // therefore the exception oop should be in the oopmap.
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100 void Exceptions::_throw_oop(Thread* thread, const char* file, int line, oop exception) {
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101 assert(exception != NULL, "exception should not be NULL");
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102 Handle h_exception = Handle(thread, exception);
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103 _throw(thread, file, line, h_exception);
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104 }
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105
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106 void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exception) {
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107 assert(h_exception() != NULL, "exception should not be NULL");
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108
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109 // tracing (do this up front - so it works during boot strapping)
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110 if (TraceExceptions) {
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111 ttyLocker ttyl;
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112 ResourceMark rm;
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113 tty->print_cr("Exception <%s> (" INTPTR_FORMAT " ) \nthrown [%s, line %d]\nfor thread " INTPTR_FORMAT,
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114 h_exception->print_value_string(), (address)h_exception(), file, line, thread);
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115 }
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116 // for AbortVMOnException flag
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117 NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
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118
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119 // Check for special boot-strapping/vm-thread handling
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120 if (special_exception(thread, file, line, h_exception)) return;
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121
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122 assert(h_exception->is_a(SystemDictionary::throwable_klass()), "exception is not a subclass of java/lang/Throwable");
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123
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124 // set the pending exception
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125 thread->set_pending_exception(h_exception(), file, line);
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126
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127 // vm log
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128 Events::log("throw_exception " INTPTR_FORMAT, (address)h_exception());
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129 }
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130
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131
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132 void Exceptions::_throw_msg(Thread* thread, const char* file, int line, symbolHandle h_name, const char* message, Handle h_loader, Handle h_protection_domain) {
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133 // Check for special boot-strapping/vm-thread handling
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134 if (special_exception(thread, file, line, h_name, message)) return;
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135 // Create and throw exception
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136 Handle h_cause(thread, NULL);
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137 Handle h_exception = new_exception(thread, h_name, message, h_cause, h_loader, h_protection_domain);
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138 _throw(thread, file, line, h_exception);
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139 }
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140
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141 // Throw an exception with a message and a cause
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142 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line, symbolHandle h_name, const char* message, Handle h_cause, Handle h_loader, Handle h_protection_domain) {
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143 // Check for special boot-strapping/vm-thread handling
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144 if (special_exception(thread, file, line, h_name, message)) return;
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145 // Create and throw exception and init cause
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146 Handle h_exception = new_exception(thread, h_name, message, h_cause, h_loader, h_protection_domain);
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147 _throw(thread, file, line, h_exception);
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148 }
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149
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150 // This version creates handles and calls the other version
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151 void Exceptions::_throw_msg(Thread* thread, const char* file, int line,
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152 symbolOop name, const char* message) {
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153 symbolHandle h_name(thread, name);
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154 Handle h_loader(thread, NULL);
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155 Handle h_protection_domain(thread, NULL);
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156 Exceptions::_throw_msg(thread, file, line, h_name, message, h_loader, h_protection_domain);
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157 }
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158
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159 // This version already has a handle for name
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160 void Exceptions::_throw_msg(Thread* thread, const char* file, int line,
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161 symbolHandle name, const char* message) {
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162 Handle h_loader(thread, NULL);
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163 Handle h_protection_domain(thread, NULL);
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164 Exceptions::_throw_msg(thread, file, line, name, message, h_loader, h_protection_domain);
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165 }
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166
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167 // This version already has a handle for name
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168 void Exceptions::_throw_msg_cause(Thread* thread, const char* file, int line,
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169 symbolHandle name, const char* message, Handle cause) {
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170 Handle h_loader(thread, NULL);
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171 Handle h_protection_domain(thread, NULL);
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172 Exceptions::_throw_msg_cause(thread, file, line, name, message, cause, h_loader, h_protection_domain);
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173 }
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174
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175 void Exceptions::_throw_args(Thread* thread, const char* file, int line, symbolHandle h_name, symbolHandle h_signature, JavaCallArguments *args) {
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176 // Check for special boot-strapping/vm-thread handling
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177 if (special_exception(thread, file, line, h_name, NULL)) return;
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178 // Create and throw exception
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179 Handle h_loader(thread, NULL);
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180 Handle h_prot(thread, NULL);
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181 Handle h_cause(thread, NULL);
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182 Handle exception = new_exception(thread, h_name, h_signature, args, h_cause, h_loader, h_prot);
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183 _throw(thread, file, line, exception);
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184 }
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185
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186
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187 void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file, int line) {
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188 Handle exception;
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189 if (!THREAD->has_pending_exception()) {
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190 klassOop k = SystemDictionary::StackOverflowError_klass();
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191 oop e = instanceKlass::cast(k)->allocate_instance(CHECK);
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192 exception = Handle(THREAD, e); // fill_in_stack trace does gc
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193 if (StackTraceInThrowable) {
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194 java_lang_Throwable::fill_in_stack_trace(exception);
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195 }
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196 } else {
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197 // if prior exception, throw that one instead
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198 exception = Handle(THREAD, THREAD->pending_exception());
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199 }
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200 _throw_oop(THREAD, file, line, exception());
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201 }
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202
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203 void Exceptions::fthrow(Thread* thread, const char* file, int line, symbolHandle h_name, const char* format, ...) {
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204 const int max_msg_size = 1024;
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205 va_list ap;
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206 va_start(ap, format);
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207 char msg[max_msg_size];
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208 vsnprintf(msg, max_msg_size, format, ap);
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209 msg[max_msg_size-1] = '\0';
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210 va_end(ap);
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211 _throw_msg(thread, file, line, h_name, msg);
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212 }
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213
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214 // Creates an exception oop, calls the <init> method with the given signature.
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215 // and returns a Handle
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216 // Initializes the cause if cause non-null
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217 Handle Exceptions::new_exception(Thread *thread, symbolHandle h_name,
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218 symbolHandle signature,
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219 JavaCallArguments *args,
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220 Handle h_cause, Handle h_loader,
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221 Handle h_protection_domain) {
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222 assert(Universe::is_fully_initialized(),
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223 "cannot be called during initialization");
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224 assert(thread->is_Java_thread(), "can only be called by a Java thread");
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225 assert(!thread->has_pending_exception(), "already has exception");
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226
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227 Handle h_exception;
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228
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229 // Resolve exception klass
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230 klassOop ik = SystemDictionary::resolve_or_fail(h_name, h_loader, h_protection_domain, true, thread);
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231 instanceKlassHandle klass (thread, ik);
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232
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233 if (!thread->has_pending_exception()) {
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234 assert(klass.not_null(), "klass must exist");
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235 // We are about to create an instance - so make sure that klass is initialized
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236 klass->initialize(thread);
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237 if (!thread->has_pending_exception()) {
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238 // Allocate new exception
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239 h_exception = klass->allocate_instance_handle(thread);
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240 if (!thread->has_pending_exception()) {
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241 JavaValue result(T_VOID);
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242 args->set_receiver(h_exception);
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243 // Call constructor
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244 JavaCalls::call_special(&result, klass,
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245 vmSymbolHandles::object_initializer_name(),
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246 signature,
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247 args,
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248 thread);
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249
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250 }
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251 }
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252
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253 // Future: object initializer should take a cause argument
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254 if (h_cause() != NULL) {
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255 assert(h_cause->is_a(SystemDictionary::throwable_klass()),
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256 "exception cause is not a subclass of java/lang/Throwable");
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257 JavaValue result1(T_OBJECT);
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258 JavaCallArguments args1;
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259 args1.set_receiver(h_exception);
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260 args1.push_oop(h_cause);
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261 JavaCalls::call_virtual(&result1, klass,
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262 vmSymbolHandles::initCause_name(),
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263 vmSymbolHandles::throwable_throwable_signature(),
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264 &args1,
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265 thread);
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266 }
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267 }
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268
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269 // Check if another exception was thrown in the process, if so rethrow that one
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270 if (thread->has_pending_exception()) {
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271 h_exception = Handle(thread, thread->pending_exception());
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272 thread->clear_pending_exception();
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273 }
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274 return h_exception;
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275 }
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276
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277 // Convenience method. Calls either the <init>() or <init>(String) method when
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278 // creating a new exception
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279 Handle Exceptions::new_exception(Thread* thread, symbolHandle h_name,
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280 const char* message, Handle h_cause,
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281 Handle h_loader,
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282 Handle h_protection_domain,
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283 ExceptionMsgToUtf8Mode to_utf8_safe) {
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284 JavaCallArguments args;
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285 symbolHandle signature;
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286 if (message == NULL) {
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287 signature = vmSymbolHandles::void_method_signature();
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288 } else {
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289 // We want to allocate storage, but we can't do that if there's
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290 // a pending exception, so we preserve any pending exception
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291 // around the allocation.
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292 // If we get an exception from the allocation, prefer that to
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293 // the exception we are trying to build, or the pending exception.
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294 // This is sort of like what PRESERVE_EXCEPTION_MARK does, except
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295 // for the preferencing and the early returns.
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296 Handle incoming_exception (thread, NULL);
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297 if (thread->has_pending_exception()) {
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298 incoming_exception = Handle(thread, thread->pending_exception());
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299 thread->clear_pending_exception();
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300 }
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301 Handle msg;
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302 if (to_utf8_safe == safe_to_utf8) {
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303 // Make a java UTF8 string.
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304 msg = java_lang_String::create_from_str(message, thread);
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305 } else {
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306 // Make a java string keeping the encoding scheme of the original string.
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307 msg = java_lang_String::create_from_platform_dependent_str(message, thread);
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308 }
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309 if (thread->has_pending_exception()) {
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310 Handle exception(thread, thread->pending_exception());
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311 thread->clear_pending_exception();
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312 return exception;
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313 }
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314 if (incoming_exception.not_null()) {
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315 return incoming_exception;
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316 }
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317 args.push_oop(msg);
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318 signature = vmSymbolHandles::string_void_signature();
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319 }
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320 return new_exception(thread, h_name, signature, &args, h_cause, h_loader, h_protection_domain);
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321 }
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322
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323 // Another convenience method that creates handles for null class loaders and
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324 // protection domains and null causes.
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325 // If the last parameter 'to_utf8_mode' is safe_to_utf8,
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326 // it means we can safely ignore the encoding scheme of the message string and
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327 // convert it directly to a java UTF8 string. Otherwise, we need to take the
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328 // encoding scheme of the string into account. One thing we should do at some
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329 // point is to push this flag down to class java_lang_String since other
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330 // classes may need similar functionalities.
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331 Handle Exceptions::new_exception(Thread* thread,
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332 symbolOop name,
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333 const char* message,
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334 ExceptionMsgToUtf8Mode to_utf8_safe) {
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335
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336 symbolHandle h_name(thread, name);
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337 Handle h_loader(thread, NULL);
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338 Handle h_prot(thread, NULL);
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339 Handle h_cause(thread, NULL);
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340 return Exceptions::new_exception(thread, h_name, message, h_cause, h_loader,
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341 h_prot, to_utf8_safe);
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342 }
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343
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344 // Implementation of ExceptionMark
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345
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346 ExceptionMark::ExceptionMark(Thread*& thread) {
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347 thread = Thread::current();
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348 _thread = thread;
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349 if (_thread->has_pending_exception()) {
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350 oop exception = _thread->pending_exception();
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351 _thread->clear_pending_exception(); // Needed to avoid infinite recursion
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352 exception->print();
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353 fatal("ExceptionMark constructor expects no pending exceptions");
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354 }
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355 }
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356
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357
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358 ExceptionMark::~ExceptionMark() {
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359 if (_thread->has_pending_exception()) {
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360 Handle exception(_thread, _thread->pending_exception());
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361 _thread->clear_pending_exception(); // Needed to avoid infinite recursion
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362 if (is_init_completed()) {
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363 exception->print();
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364 fatal("ExceptionMark destructor expects no pending exceptions");
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365 } else {
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366 vm_exit_during_initialization(exception);
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367 }
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368 }
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369 }
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370
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371 // ----------------------------------------------------------------------------------------
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372
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373 #ifndef PRODUCT
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374 // caller frees value_string if necessary
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375 void Exceptions::debug_check_abort(const char *value_string) {
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376 if (AbortVMOnException != NULL && value_string != NULL &&
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377 strstr(value_string, AbortVMOnException)) {
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378 fatal1("Saw %s, aborting", value_string);
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379 }
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380 }
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381
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382 void Exceptions::debug_check_abort(Handle exception) {
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383 if (AbortVMOnException != NULL) {
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384 ResourceMark rm;
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385 debug_check_abort(instanceKlass::cast(exception()->klass())->external_name());
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386 }
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387 }
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388 #endif
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