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0
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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_javaCalls.cpp.incl"
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27
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28 // -----------------------------------------------------
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29 // Implementation of JavaCallWrapper
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30
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31 JavaCallWrapper::JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS) {
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32 JavaThread* thread = (JavaThread *)THREAD;
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33 bool clear_pending_exception = true;
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34
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35 guarantee(thread->is_Java_thread(), "crucial check - the VM thread cannot and must not escape to Java code");
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36 assert(!thread->owns_locks(), "must release all locks when leaving VM");
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37 guarantee(!thread->is_Compiler_thread(), "cannot make java calls from the compiler");
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38 _result = result;
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39
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40 // Make sure that that the value of the higest_lock is at least the same as the current stackpointer,
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41 // since, the Java code is highly likely to use locks.
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42 // Use '(address)this' to guarantee that highest_lock address is conservative and inside our thread
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43 thread->update_highest_lock((address)this);
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44
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45 // Allocate handle block for Java code. This must be done before we change thread_state to _thread_in_Java_or_stub,
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46 // since it can potentially block.
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47 JNIHandleBlock* new_handles = JNIHandleBlock::allocate_block(thread);
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48
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49 // After this, we are official in JavaCode. This needs to be done before we change any of the thread local
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50 // info, since we cannot find oops before the new information is set up completely.
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51 ThreadStateTransition::transition(thread, _thread_in_vm, _thread_in_Java);
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52
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53 // Make sure that we handle asynchronous stops and suspends _before_ we clear all thread state
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54 // in JavaCallWrapper::JavaCallWrapper(). This way, we can decide if we need to do any pd actions
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55 // to prepare for stop/suspend (flush register windows on sparcs, cache sp, or other state).
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56 if (thread->has_special_runtime_exit_condition()) {
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57 thread->handle_special_runtime_exit_condition();
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58 if (HAS_PENDING_EXCEPTION) {
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59 clear_pending_exception = false;
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60 }
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61 }
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62
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63
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64 // Make sure to set the oop's after the thread transition - since we can block there. No one is GC'ing
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65 // the JavaCallWrapper before the entry frame is on the stack.
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66 _callee_method = callee_method();
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67 _receiver = receiver();
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68
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69 #ifdef CHECK_UNHANDLED_OOPS
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70 THREAD->allow_unhandled_oop(&_callee_method);
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71 THREAD->allow_unhandled_oop(&_receiver);
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72 #endif // CHECK_UNHANDLED_OOPS
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73
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74 _thread = (JavaThread *)thread;
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75 _handles = _thread->active_handles(); // save previous handle block & Java frame linkage
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76
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77 // For the profiler, the last_Java_frame information in thread must always be in
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78 // legal state. We have no last Java frame if last_Java_sp == NULL so
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79 // the valid transition is to clear _last_Java_sp and then reset the rest of
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80 // the (platform specific) state.
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81
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82 _anchor.copy(_thread->frame_anchor());
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83 _thread->frame_anchor()->clear();
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84
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85 debug_only(_thread->inc_java_call_counter());
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86 _thread->set_active_handles(new_handles); // install new handle block and reset Java frame linkage
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87
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88 assert (_thread->thread_state() != _thread_in_native, "cannot set native pc to NULL");
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89
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90 // clear any pending exception in thread (native calls start with no exception pending)
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91 if(clear_pending_exception) {
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92 _thread->clear_pending_exception();
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93 }
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94
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95 if (_anchor.last_Java_sp() == NULL) {
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96 _thread->record_base_of_stack_pointer();
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97 }
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98 }
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99
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100
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101 JavaCallWrapper::~JavaCallWrapper() {
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102 assert(_thread == JavaThread::current(), "must still be the same thread");
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103
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104 // restore previous handle block & Java frame linkage
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105 JNIHandleBlock *_old_handles = _thread->active_handles();
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106 _thread->set_active_handles(_handles);
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107
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108 _thread->frame_anchor()->zap();
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109
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110 debug_only(_thread->dec_java_call_counter());
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111
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112 if (_anchor.last_Java_sp() == NULL) {
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113 _thread->set_base_of_stack_pointer(NULL);
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114 }
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115
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116
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117 // Old thread-local info. has been restored. We are not back in the VM.
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118 ThreadStateTransition::transition_from_java(_thread, _thread_in_vm);
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119
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120 // State has been restored now make the anchor frame visible for the profiler.
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121 // Do this after the transition because this allows us to put an assert
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122 // the Java->vm transition which checks to see that stack is not walkable
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123 // on sparc/ia64 which will catch violations of the reseting of last_Java_frame
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124 // invariants (i.e. _flags always cleared on return to Java)
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125
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126 _thread->frame_anchor()->copy(&_anchor);
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127
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128 // Release handles after we are marked as being inside the VM again, since this
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129 // operation might block
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130 JNIHandleBlock::release_block(_old_handles, _thread);
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131 }
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132
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133
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134 void JavaCallWrapper::oops_do(OopClosure* f) {
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135 f->do_oop((oop*)&_callee_method);
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136 f->do_oop((oop*)&_receiver);
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137 handles()->oops_do(f);
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138 }
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139
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140
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141 // Helper methods
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142 static BasicType runtime_type_from(JavaValue* result) {
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143 switch (result->get_type()) {
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144 case T_BOOLEAN: // fall through
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145 case T_CHAR : // fall through
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146 case T_SHORT : // fall through
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147 case T_INT : // fall through
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148 #ifndef _LP64
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149 case T_OBJECT : // fall through
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150 case T_ARRAY : // fall through
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151 #endif
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152 case T_BYTE : // fall through
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153 case T_VOID : return T_INT;
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154 case T_LONG : return T_LONG;
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155 case T_FLOAT : return T_FLOAT;
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156 case T_DOUBLE : return T_DOUBLE;
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157 #ifdef _LP64
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158 case T_ARRAY : // fall through
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159 case T_OBJECT: return T_OBJECT;
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160 #endif
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161 }
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162 ShouldNotReachHere();
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163 return T_ILLEGAL;
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164 }
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165
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166 // ===== object constructor calls =====
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167
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168 void JavaCalls::call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS) {
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169 assert(method->name() == vmSymbols::object_initializer_name(), "Should only be called for default constructor");
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170 assert(method->signature() == vmSymbols::void_method_signature(), "Should only be called for default constructor");
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171
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172 instanceKlass* ik = instanceKlass::cast(method->method_holder());
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173 if (ik->is_initialized() && ik->has_vanilla_constructor()) {
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174 // safe to skip constructor call
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175 } else {
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176 static JavaValue result(T_VOID);
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177 JavaCallArguments args(receiver);
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178 call(&result, method, &args, CHECK);
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179 }
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180 }
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181
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182 // ============ Virtual calls ============
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183
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184 void JavaCalls::call_virtual(JavaValue* result, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
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185 CallInfo callinfo;
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186 Handle receiver = args->receiver();
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187 KlassHandle recvrKlass(THREAD, receiver.is_null() ? (klassOop)NULL : receiver->klass());
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188 LinkResolver::resolve_virtual_call(
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189 callinfo, receiver, recvrKlass, spec_klass, name, signature,
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190 KlassHandle(), false, true, CHECK);
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191 methodHandle method = callinfo.selected_method();
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192 assert(method.not_null(), "should have thrown exception");
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193
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194 // Invoke the method
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195 JavaCalls::call(result, method, args, CHECK);
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196 }
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197
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198
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199 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, TRAPS) {
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200 JavaCallArguments args(receiver); // One oop argument
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201 call_virtual(result, spec_klass, name, signature, &args, CHECK);
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202 }
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203
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204
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205 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
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206 JavaCallArguments args(receiver); // One oop argument
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207 args.push_oop(arg1);
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208 call_virtual(result, spec_klass, name, signature, &args, CHECK);
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209 }
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210
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211
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212
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213 void JavaCalls::call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
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214 JavaCallArguments args(receiver); // One oop argument
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215 args.push_oop(arg1);
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216 args.push_oop(arg2);
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217 call_virtual(result, spec_klass, name, signature, &args, CHECK);
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218 }
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219
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220
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221 // ============ Special calls ============
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222
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223 void JavaCalls::call_special(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
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224 CallInfo callinfo;
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225 LinkResolver::resolve_special_call(callinfo, klass, name, signature, KlassHandle(), false, CHECK);
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226 methodHandle method = callinfo.selected_method();
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227 assert(method.not_null(), "should have thrown exception");
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228
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229 // Invoke the method
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230 JavaCalls::call(result, method, args, CHECK);
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231 }
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232
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233
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234 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
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235 JavaCallArguments args(receiver); // One oop argument
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236 call_special(result, klass, name, signature, &args, CHECK);
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237 }
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238
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239
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240 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
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241 JavaCallArguments args(receiver); // One oop argument
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242 args.push_oop(arg1);
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243 call_special(result, klass, name, signature, &args, CHECK);
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244 }
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245
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246
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247 void JavaCalls::call_special(JavaValue* result, Handle receiver, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
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248 JavaCallArguments args(receiver); // One oop argument
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249 args.push_oop(arg1);
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250 args.push_oop(arg2);
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251 call_special(result, klass, name, signature, &args, CHECK);
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252 }
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253
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254
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255 // ============ Static calls ============
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256
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257 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, JavaCallArguments* args, TRAPS) {
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258 CallInfo callinfo;
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259 LinkResolver::resolve_static_call(callinfo, klass, name, signature, KlassHandle(), false, true, CHECK);
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260 methodHandle method = callinfo.selected_method();
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261 assert(method.not_null(), "should have thrown exception");
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262
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263 // Invoke the method
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264 JavaCalls::call(result, method, args, CHECK);
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265 }
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266
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267
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268 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, TRAPS) {
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269 JavaCallArguments args; // No argument
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270 call_static(result, klass, name, signature, &args, CHECK);
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271 }
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272
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273
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274 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, TRAPS) {
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275 JavaCallArguments args(arg1); // One oop argument
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276 call_static(result, klass, name, signature, &args, CHECK);
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277 }
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278
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279
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280 void JavaCalls::call_static(JavaValue* result, KlassHandle klass, symbolHandle name, symbolHandle signature, Handle arg1, Handle arg2, TRAPS) {
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281 JavaCallArguments args; // One oop argument
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282 args.push_oop(arg1);
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283 args.push_oop(arg2);
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284 call_static(result, klass, name, signature, &args, CHECK);
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285 }
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286
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287
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288 // -------------------------------------------------
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289 // Implementation of JavaCalls (low level)
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290
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291
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292 void JavaCalls::call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS) {
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293 // Check if we need to wrap a potential OS exception handler around thread
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294 // This is used for e.g. Win32 structured exception handlers
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295 assert(THREAD->is_Java_thread(), "only JavaThreads can make JavaCalls");
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296 // Need to wrap each and everytime, since there might be native code down the
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297 // stack that has installed its own exception handlers
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298 os::os_exception_wrapper(call_helper, result, &method, args, THREAD);
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299 }
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300
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301 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) {
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302 methodHandle method = *m;
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303 JavaThread* thread = (JavaThread*)THREAD;
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304 assert(thread->is_Java_thread(), "must be called by a java thread");
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305 assert(method.not_null(), "must have a method to call");
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306 assert(!SafepointSynchronize::is_at_safepoint(), "call to Java code during VM operation");
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307 assert(!thread->handle_area()->no_handle_mark_active(), "cannot call out to Java here");
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308
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309
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310 CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
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311
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312 // Make sure that the arguments have the right type
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313 debug_only(args->verify(method, result->get_type(), thread));
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314
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315 // Ignore call if method is empty
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316 if (method->is_empty_method()) {
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317 assert(result->get_type() == T_VOID, "an empty method must return a void value");
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318 return;
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319 }
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320
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321
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322 #ifdef ASSERT
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323 { klassOop holder = method->method_holder();
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324 // A klass might not be initialized since JavaCall's might be used during the executing of
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325 // the <clinit>. For example, a Thread.start might start executing on an object that is
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326 // not fully initialized! (bad Java programming style)
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327 assert(instanceKlass::cast(holder)->is_linked(), "rewritting must have taken place");
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328 }
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329 #endif
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330
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331
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332 assert(!thread->is_Compiler_thread(), "cannot compile from the compiler");
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333 if (CompilationPolicy::mustBeCompiled(method)) {
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334 CompileBroker::compile_method(method, InvocationEntryBci,
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335 methodHandle(), 0, "mustBeCompiled", CHECK);
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336 }
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337
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338 // Since the call stub sets up like the interpreter we call the from_interpreted_entry
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339 // so we can go compiled via a i2c. Otherwise initial entry method will always
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340 // run interpreted.
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341 address entry_point = method->from_interpreted_entry();
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342 if (JvmtiExport::can_post_interpreter_events() && thread->is_interp_only_mode()) {
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343 entry_point = method->interpreter_entry();
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344 }
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345
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346 // Figure out if the result value is an oop or not (Note: This is a different value
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347 // than result_type. result_type will be T_INT of oops. (it is about size)
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348 BasicType result_type = runtime_type_from(result);
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349 bool oop_result_flag = (result->get_type() == T_OBJECT || result->get_type() == T_ARRAY);
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350
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351 // NOTE: if we move the computation of the result_val_address inside
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352 // the call to call_stub, the optimizer produces wrong code.
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353 intptr_t* result_val_address = (intptr_t*)(result->get_value_addr());
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354
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355 // Find receiver
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356 Handle receiver = (!method->is_static()) ? args->receiver() : Handle();
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357
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358 // When we reenter Java, we need to reenable the yellow zone which
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359 // might already be disabled when we are in VM.
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360 if (thread->stack_yellow_zone_disabled()) {
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361 thread->reguard_stack();
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362 }
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363
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364 // Check that there are shadow pages available before changing thread state
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365 // to Java
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366 if (!os::stack_shadow_pages_available(THREAD, method)) {
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367 // Throw stack overflow exception with preinitialized exception.
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368 Exceptions::throw_stack_overflow_exception(THREAD, __FILE__, __LINE__);
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369 return;
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370 } else {
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371 // Touch pages checked if the OS needs them to be touched to be mapped.
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372 os::bang_stack_shadow_pages();
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373 }
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374
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375 // do call
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376 { JavaCallWrapper link(method, receiver, result, CHECK);
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377 { HandleMark hm(thread); // HandleMark used by HandleMarkCleaner
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378
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379 StubRoutines::call_stub()(
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380 (address)&link,
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381 // (intptr_t*)&(result->_value), // see NOTE above (compiler problem)
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382 result_val_address, // see NOTE above (compiler problem)
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383 result_type,
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384 method(),
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385 entry_point,
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386 args->parameters(),
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387 args->size_of_parameters(),
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388 CHECK
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389 );
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390
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391 result = link.result(); // circumvent MS C++ 5.0 compiler bug (result is clobbered across call)
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392 // Preserve oop return value across possible gc points
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393 if (oop_result_flag) {
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394 thread->set_vm_result((oop) result->get_jobject());
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395 }
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396 }
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397 } // Exit JavaCallWrapper (can block - potential return oop must be preserved)
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398
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399 // Check if a thread stop or suspend should be executed
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400 // The following assert was not realistic. Thread.stop can set that bit at any moment.
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401 //assert(!thread->has_special_runtime_exit_condition(), "no async. exceptions should be installed");
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402
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403 // Restore possible oop return
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404 if (oop_result_flag) {
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405 result->set_jobject((jobject)thread->vm_result());
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406 thread->set_vm_result(NULL);
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407 }
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408 }
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409
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410
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411 //--------------------------------------------------------------------------------------
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412 // Implementation of JavaCallArguments
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413
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414 intptr_t* JavaCallArguments::parameters() {
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415 // First convert all handles to oops
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416 for(int i = 0; i < _size; i++) {
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417 if (_is_oop[i]) {
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418 // Handle conversion
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419 _value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]);
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420 }
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421 // The parameters are moved to the parameters array to include the tags.
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422 if (TaggedStackInterpreter) {
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423 // Tags are interspersed with arguments. Tags are first.
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424 int tagged_index = i*2;
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425 _parameters[tagged_index] = _is_oop[i] ? frame::TagReference :
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426 frame::TagValue;
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427 _parameters[tagged_index+1] = _value[i];
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428 }
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429 }
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|
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430 // Return argument vector
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431 return TaggedStackInterpreter ? _parameters : _value;
|
|
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432 }
|
|
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433
|
|
|
434 //--------------------------------------------------------------------------------------
|
|
|
435 // Non-Product code
|
|
|
436 #ifndef PRODUCT
|
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437
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|
|
438 class SignatureChekker : public SignatureIterator {
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439 private:
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440 bool *_is_oop;
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441 int _pos;
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|
|
442 BasicType _return_type;
|
|
|
443
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|
444 public:
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|
|
445 bool _is_return;
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446
|
|
|
447 SignatureChekker(symbolHandle signature, BasicType return_type, bool is_static, bool* is_oop) : SignatureIterator(signature) {
|
|
|
448 _is_oop = is_oop;
|
|
|
449 _is_return = false;
|
|
|
450 _return_type = return_type;
|
|
|
451 _pos = 0;
|
|
|
452 if (!is_static) {
|
|
|
453 check_value(true); // Receiver must be an oop
|
|
|
454 }
|
|
|
455 }
|
|
|
456
|
|
|
457 void check_value(bool type) {
|
|
|
458 guarantee(_is_oop[_pos++] == type, "signature does not match pushed arguments");
|
|
|
459 }
|
|
|
460
|
|
|
461 void check_doing_return(bool state) { _is_return = state; }
|
|
|
462
|
|
|
463 void check_return_type(BasicType t) {
|
|
|
464 guarantee(_is_return && t == _return_type, "return type does not match");
|
|
|
465 }
|
|
|
466
|
|
|
467 void check_int(BasicType t) {
|
|
|
468 if (_is_return) {
|
|
|
469 check_return_type(t);
|
|
|
470 return;
|
|
|
471 }
|
|
|
472 check_value(false);
|
|
|
473 }
|
|
|
474
|
|
|
475 void check_double(BasicType t) { check_long(t); }
|
|
|
476
|
|
|
477 void check_long(BasicType t) {
|
|
|
478 if (_is_return) {
|
|
|
479 check_return_type(t);
|
|
|
480 return;
|
|
|
481 }
|
|
|
482
|
|
|
483 check_value(false);
|
|
|
484 check_value(false);
|
|
|
485 }
|
|
|
486
|
|
|
487 void check_obj(BasicType t) {
|
|
|
488 if (_is_return) {
|
|
|
489 check_return_type(t);
|
|
|
490 return;
|
|
|
491 }
|
|
|
492 check_value(true);
|
|
|
493 }
|
|
|
494
|
|
|
495 void do_bool() { check_int(T_BOOLEAN); }
|
|
|
496 void do_char() { check_int(T_CHAR); }
|
|
|
497 void do_float() { check_int(T_FLOAT); }
|
|
|
498 void do_double() { check_double(T_DOUBLE); }
|
|
|
499 void do_byte() { check_int(T_BYTE); }
|
|
|
500 void do_short() { check_int(T_SHORT); }
|
|
|
501 void do_int() { check_int(T_INT); }
|
|
|
502 void do_long() { check_long(T_LONG); }
|
|
|
503 void do_void() { check_return_type(T_VOID); }
|
|
|
504 void do_object(int begin, int end) { check_obj(T_OBJECT); }
|
|
|
505 void do_array(int begin, int end) { check_obj(T_OBJECT); }
|
|
|
506 };
|
|
|
507
|
|
|
508 void JavaCallArguments::verify(methodHandle method, BasicType return_type,
|
|
|
509 Thread *thread) {
|
|
|
510 guarantee(method->size_of_parameters() == size_of_parameters(), "wrong no. of arguments pushed");
|
|
|
511
|
|
|
512 // Treat T_OBJECT and T_ARRAY as the same
|
|
|
513 if (return_type == T_ARRAY) return_type = T_OBJECT;
|
|
|
514
|
|
|
515 // Check that oop information is correct
|
|
|
516 symbolHandle signature (thread, method->signature());
|
|
|
517
|
|
|
518 SignatureChekker sc(signature, return_type, method->is_static(),_is_oop);
|
|
|
519 sc.iterate_parameters();
|
|
|
520 sc.check_doing_return(true);
|
|
|
521 sc.iterate_returntype();
|
|
|
522 }
|
|
|
523
|
|
|
524 #endif // PRODUCT
|
