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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 class AdapterHandlerEntry;
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26 class vframeStream;
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27
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28 // Runtime is the base class for various runtime interfaces
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29 // (InterpreterRuntime, CompilerRuntime, etc.). It provides
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30 // shared functionality such as exception forwarding (C++ to
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31 // Java exceptions), locking/unlocking mechanisms, statistical
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32 // information, etc.
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33
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34 class SharedRuntime: AllStatic {
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35 private:
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36 static methodHandle resolve_sub_helper(JavaThread *thread,
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37 bool is_virtual,
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38 bool is_optimized, TRAPS);
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39
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40 // Shared stub locations
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41
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42 static RuntimeStub* _wrong_method_blob;
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43 static RuntimeStub* _ic_miss_blob;
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44 static RuntimeStub* _resolve_opt_virtual_call_blob;
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45 static RuntimeStub* _resolve_virtual_call_blob;
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46 static RuntimeStub* _resolve_static_call_blob;
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47
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48 static SafepointBlob* _polling_page_safepoint_handler_blob;
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49 static SafepointBlob* _polling_page_return_handler_blob;
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50 #ifdef COMPILER2
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51 static ExceptionBlob* _exception_blob;
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52 static UncommonTrapBlob* _uncommon_trap_blob;
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53 #endif // COMPILER2
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54
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55 #ifndef PRODUCT
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56
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57 // Counters
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58 static int _nof_megamorphic_calls; // total # of megamorphic calls (through vtable)
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59
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60 #endif // !PRODUCT
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61 public:
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62 // The following arithmetic routines are used on platforms that do
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63 // not have machine instructions to implement their functionality.
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64 // Do not remove these.
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65
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66 // long arithmetics
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67 static jlong lmul(jlong y, jlong x);
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68 static jlong ldiv(jlong y, jlong x);
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69 static jlong lrem(jlong y, jlong x);
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70
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71 // float and double remainder
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72 static jfloat frem(jfloat x, jfloat y);
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73 static jdouble drem(jdouble x, jdouble y);
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74
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75 // float conversion (needs to set appropriate rounding mode)
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76 static jint f2i (jfloat x);
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77 static jlong f2l (jfloat x);
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78 static jint d2i (jdouble x);
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79 static jlong d2l (jdouble x);
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80 static jfloat d2f (jdouble x);
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81 static jfloat l2f (jlong x);
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82 static jdouble l2d (jlong x);
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83
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84 // double trigonometrics and transcendentals
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85 static jdouble dsin(jdouble x);
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86 static jdouble dcos(jdouble x);
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87 static jdouble dtan(jdouble x);
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88 static jdouble dlog(jdouble x);
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89 static jdouble dlog10(jdouble x);
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90 static jdouble dexp(jdouble x);
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91 static jdouble dpow(jdouble x, jdouble y);
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92
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93
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94 // exception handling across interpreter/compiler boundaries
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95 static address raw_exception_handler_for_return_address(address return_address);
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96 static address exception_handler_for_return_address(address return_address);
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97
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98 // exception handling and implicit exceptions
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99 static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
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100 bool force_unwind, bool top_frame_only);
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101 enum ImplicitExceptionKind {
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102 IMPLICIT_NULL,
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103 IMPLICIT_DIVIDE_BY_ZERO,
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104 STACK_OVERFLOW
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105 };
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106 static void throw_AbstractMethodError(JavaThread* thread);
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107 static void throw_ArithmeticException(JavaThread* thread);
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108 static void throw_NullPointerException(JavaThread* thread);
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109 static void throw_NullPointerException_at_call(JavaThread* thread);
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110 static void throw_StackOverflowError(JavaThread* thread);
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111 static address continuation_for_implicit_exception(JavaThread* thread,
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112 address faulting_pc,
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113 ImplicitExceptionKind exception_kind);
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114
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115 // Shared stub locations
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116 static address get_poll_stub(address pc);
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117
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118 static address get_ic_miss_stub() {
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119 assert(_ic_miss_blob!= NULL, "oops");
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120 return _ic_miss_blob->instructions_begin();
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121 }
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122
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123 static address get_handle_wrong_method_stub() {
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124 assert(_wrong_method_blob!= NULL, "oops");
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125 return _wrong_method_blob->instructions_begin();
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126 }
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127
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128 #ifdef COMPILER2
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129 static void generate_uncommon_trap_blob(void);
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130 static UncommonTrapBlob* uncommon_trap_blob() { return _uncommon_trap_blob; }
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131 #endif // COMPILER2
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132
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133 static address get_resolve_opt_virtual_call_stub(){
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134 assert(_resolve_opt_virtual_call_blob != NULL, "oops");
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135 return _resolve_opt_virtual_call_blob->instructions_begin();
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136 }
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137 static address get_resolve_virtual_call_stub() {
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138 assert(_resolve_virtual_call_blob != NULL, "oops");
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139 return _resolve_virtual_call_blob->instructions_begin();
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140 }
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141 static address get_resolve_static_call_stub() {
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142 assert(_resolve_static_call_blob != NULL, "oops");
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143 return _resolve_static_call_blob->instructions_begin();
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144 }
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145
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146 static SafepointBlob* polling_page_return_handler_blob() { return _polling_page_return_handler_blob; }
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147 static SafepointBlob* polling_page_safepoint_handler_blob() { return _polling_page_safepoint_handler_blob; }
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148
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149 // Counters
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150 #ifndef PRODUCT
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151 static address nof_megamorphic_calls_addr() { return (address)&_nof_megamorphic_calls; }
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152 #endif // PRODUCT
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153
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154 // Helper routine for full-speed JVMTI exception throwing support
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155 static void throw_and_post_jvmti_exception(JavaThread *thread, Handle h_exception);
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156 static void throw_and_post_jvmti_exception(JavaThread *thread, symbolOop name, const char *message = NULL);
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157
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158 // To be used as the entry point for unresolved native methods.
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159 static address native_method_throw_unsatisfied_link_error_entry();
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160
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161 // bytecode tracing is only used by the TraceBytecodes
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162 static intptr_t trace_bytecode(JavaThread* thread, intptr_t preserve_this_value, intptr_t tos, intptr_t tos2) PRODUCT_RETURN0;
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163
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164 // Used to back off a spin lock that is under heavy contention
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165 static void yield_all(JavaThread* thread, int attempts = 0);
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166
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167 static oop retrieve_receiver( symbolHandle sig, frame caller );
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168
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169 static void verify_caller_frame(frame caller_frame, methodHandle callee_method) PRODUCT_RETURN;
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170 static methodHandle find_callee_method_inside_interpreter(frame caller_frame, methodHandle caller_method, int bci) PRODUCT_RETURN_(return methodHandle(););
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171
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172 static void register_finalizer(JavaThread* thread, oopDesc* obj);
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173
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174 // dtrace notifications
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175 static int dtrace_object_alloc(oopDesc* o);
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176 static int dtrace_object_alloc_base(Thread* thread, oopDesc* o);
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177 static int dtrace_method_entry(JavaThread* thread, methodOopDesc* m);
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178 static int dtrace_method_exit(JavaThread* thread, methodOopDesc* m);
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179
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180 // Utility method for retrieving the Java thread id, returns 0 if the
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181 // thread is not a well formed Java thread.
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182 static jlong get_java_tid(Thread* thread);
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183
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184
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185 // used by native wrappers to reenable yellow if overflow happened in native code
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186 static void reguard_yellow_pages();
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187
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188 /**
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189 * Fill in the "X cannot be cast to a Y" message for ClassCastException
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190 *
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191 * @param thr the current thread
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192 * @param name the name of the class of the object attempted to be cast
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193 * @return the dynamically allocated exception message (must be freed
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194 * by the caller using a resource mark)
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195 *
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196 * BCP must refer to the current 'checkcast' opcode for the frame
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197 * on top of the stack.
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198 * The caller (or one of it's callers) must use a ResourceMark
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199 * in order to correctly free the result.
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200 */
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201 static char* generate_class_cast_message(JavaThread* thr, const char* name);
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202
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203 /**
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204 * Fill in the "X cannot be cast to a Y" message for ClassCastException
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205 *
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206 * @param name the name of the class of the object attempted to be cast
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207 * @param klass the name of the target klass attempt
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208 * @return the dynamically allocated exception message (must be freed
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209 * by the caller using a resource mark)
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210 *
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211 * This version does not require access the frame, so it can be called
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212 * from interpreted code
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213 * The caller (or one of it's callers) must use a ResourceMark
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214 * in order to correctly free the result.
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215 */
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216 static char* generate_class_cast_message(const char* name, const char* klass);
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217
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218 // Resolves a call site- may patch in the destination of the call into the
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219 // compiled code.
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220 static methodHandle resolve_helper(JavaThread *thread,
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221 bool is_virtual,
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222 bool is_optimized, TRAPS);
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223
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224 static void generate_stubs(void);
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225
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226 private:
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227 // deopt blob
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228 static void generate_deopt_blob(void);
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229 static DeoptimizationBlob* _deopt_blob;
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230
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231 public:
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232 static DeoptimizationBlob* deopt_blob(void) { return _deopt_blob; }
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233
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234 // Resets a call-site in compiled code so it will get resolved again.
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235 static methodHandle reresolve_call_site(JavaThread *thread, TRAPS);
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236
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237 // In the code prolog, if the klass comparison fails, the inline cache
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238 // misses and the call site is patched to megamorphic
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239 static methodHandle handle_ic_miss_helper(JavaThread* thread, TRAPS);
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240
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241 // Find the method that called us.
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242 static methodHandle find_callee_method(JavaThread* thread, TRAPS);
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243
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244
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245 private:
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246 static Handle find_callee_info(JavaThread* thread,
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247 Bytecodes::Code& bc,
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248 CallInfo& callinfo, TRAPS);
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249 static Handle find_callee_info_helper(JavaThread* thread,
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250 vframeStream& vfst,
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251 Bytecodes::Code& bc,
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252 CallInfo& callinfo, TRAPS);
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253
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254 static address clean_virtual_call_entry();
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255 static address clean_opt_virtual_call_entry();
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256 static address clean_static_call_entry();
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257
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258 public:
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259
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260
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261 static void create_native_wrapper (JavaThread* thread, methodOop method);
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262
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263 // Read the array of BasicTypes from a Java signature, and compute where
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264 // compiled Java code would like to put the results. Values in reg_lo and
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265 // reg_hi refer to 4-byte quantities. Values less than SharedInfo::stack0 are
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266 // registers, those above refer to 4-byte stack slots. All stack slots are
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267 // based off of the window top. SharedInfo::stack0 refers to the first usable
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268 // slot in the bottom of the frame. SharedInfo::stack0+1 refers to the memory word
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269 // 4-bytes higher. So for sparc because the register window save area is at
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270 // the bottom of the frame the first 16 words will be skipped and SharedInfo::stack0
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271 // will be just above it. (
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272 // return value is the maximum number of VMReg stack slots the convention will use.
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273 static int java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed, int is_outgoing);
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274
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275 // Ditto except for calling C
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276 static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
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277
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278 // Generate I2C and C2I adapters. These adapters are simple argument marshalling
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279 // blobs. Unlike adapters in the tiger and earlier releases the code in these
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280 // blobs does not create a new frame and are therefore virtually invisible
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281 // to the stack walking code. In general these blobs extend the callers stack
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282 // as needed for the conversion of argument locations.
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283
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284 // When calling a c2i blob the code will always call the interpreter even if
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285 // by the time we reach the blob there is compiled code available. This allows
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286 // the blob to pass the incoming stack pointer (the sender sp) in a known
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287 // location for the interpreter to record. This is used by the frame code
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288 // to correct the sender code to match up with the stack pointer when the
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289 // thread left the compiled code. In addition it allows the interpreter
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290 // to remove the space the c2i adapter allocated to do it argument conversion.
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291
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292 // Although a c2i blob will always run interpreted even if compiled code is
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293 // present if we see that compiled code is present the compiled call site
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294 // will be patched/re-resolved so that later calls will run compiled.
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295
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296 // Aditionally a c2i blob need to have a unverified entry because it can be reached
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297 // in situations where the call site is an inlined cache site and may go megamorphic.
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298
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299 // A i2c adapter is simpler than the c2i adapter. This is because it is assumed
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300 // that the interpreter before it does any call dispatch will record the current
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301 // stack pointer in the interpreter frame. On return it will restore the stack
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302 // pointer as needed. This means the i2c adapter code doesn't need any special
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303 // handshaking path with compiled code to keep the stack walking correct.
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304
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305 static AdapterHandlerEntry* generate_i2c2i_adapters(MacroAssembler *_masm,
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306 int total_args_passed,
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307 int max_arg,
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308 const BasicType *sig_bt,
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309 const VMRegPair *regs);
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310
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311 // OSR support
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312
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313 // OSR_migration_begin will extract the jvm state from an interpreter
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314 // frame (locals, monitors) and store the data in a piece of C heap
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315 // storage. This then allows the interpreter frame to be removed from the
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316 // stack and the OSR nmethod to be called. That method is called with a
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317 // pointer to the C heap storage. This pointer is the return value from
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318 // OSR_migration_begin.
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319
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320 static intptr_t* OSR_migration_begin( JavaThread *thread);
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321
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322 // OSR_migration_end is a trivial routine. It is called after the compiled
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323 // method has extracted the jvm state from the C heap that OSR_migration_begin
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324 // created. It's entire job is to simply free this storage.
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325 static void OSR_migration_end ( intptr_t* buf);
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326
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327 // Convert a sig into a calling convention register layout
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328 // and find interesting things about it.
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329 static VMRegPair* find_callee_arguments(symbolOop sig, bool is_static, int *arg_size);
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330 static VMReg name_for_receiver();
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331
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332 // "Top of Stack" slots that may be unused by the calling convention but must
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333 // otherwise be preserved.
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334 // On Intel these are not necessary and the value can be zero.
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335 // On Sparc this describes the words reserved for storing a register window
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336 // when an interrupt occurs.
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337 static uint out_preserve_stack_slots();
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338
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339 // Save and restore a native result
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340 static void save_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
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341 static void restore_native_result(MacroAssembler *_masm, BasicType ret_type, int frame_slots );
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342
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343 // Generate a native wrapper for a given method. The method takes arguments
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344 // in the Java compiled code convention, marshals them to the native
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345 // convention (handlizes oops, etc), transitions to native, makes the call,
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346 // returns to java state (possibly blocking), unhandlizes any result and
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347 // returns.
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348 static nmethod *generate_native_wrapper(MacroAssembler* masm,
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349 methodHandle method,
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350 int total_args_passed,
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351 int max_arg,
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352 BasicType *sig_bt,
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353 VMRegPair *regs,
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354 BasicType ret_type );
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355
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356 // A compiled caller has just called the interpreter, but compiled code
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357 // exists. Patch the caller so he no longer calls into the interpreter.
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358 static void fixup_callers_callsite(methodOopDesc* moop, address ret_pc);
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359
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360 // Slow-path Locking and Unlocking
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361 static void complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* thread);
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362 static void complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock);
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363
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364 // Resolving of calls
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365 static address resolve_static_call_C (JavaThread *thread);
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366 static address resolve_virtual_call_C (JavaThread *thread);
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367 static address resolve_opt_virtual_call_C(JavaThread *thread);
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368
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369 // arraycopy, the non-leaf version. (See StubRoutines for all the leaf calls.)
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370 static void slow_arraycopy_C(oopDesc* src, jint src_pos,
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371 oopDesc* dest, jint dest_pos,
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372 jint length, JavaThread* thread);
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373
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374 // handle ic miss with caller being compiled code
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375 // wrong method handling (inline cache misses, zombie methods)
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376 static address handle_wrong_method(JavaThread* thread);
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377 static address handle_wrong_method_ic_miss(JavaThread* thread);
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378
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379 #ifndef PRODUCT
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380
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381 // Collect and print inline cache miss statistics
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382 private:
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383 enum { maxICmiss_count = 100 };
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384 static int _ICmiss_index; // length of IC miss histogram
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385 static int _ICmiss_count[maxICmiss_count]; // miss counts
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386 static address _ICmiss_at[maxICmiss_count]; // miss addresses
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387 static void trace_ic_miss(address at);
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388
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389 public:
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390 static int _monitor_enter_ctr; // monitor enter slow
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391 static int _monitor_exit_ctr; // monitor exit slow
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392 static int _throw_null_ctr; // throwing a null-pointer exception
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393 static int _ic_miss_ctr; // total # of IC misses
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394 static int _wrong_method_ctr;
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395 static int _resolve_static_ctr;
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396 static int _resolve_virtual_ctr;
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397 static int _resolve_opt_virtual_ctr;
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398 static int _implicit_null_throws;
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399 static int _implicit_div0_throws;
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400
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401 static int _jbyte_array_copy_ctr; // Slow-path byte array copy
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402 static int _jshort_array_copy_ctr; // Slow-path short array copy
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403 static int _jint_array_copy_ctr; // Slow-path int array copy
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404 static int _jlong_array_copy_ctr; // Slow-path long array copy
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405 static int _oop_array_copy_ctr; // Slow-path oop array copy
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406 static int _checkcast_array_copy_ctr; // Slow-path oop array copy, with cast
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407 static int _unsafe_array_copy_ctr; // Slow-path includes alignment checks
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408 static int _generic_array_copy_ctr; // Slow-path includes type decoding
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409 static int _slow_array_copy_ctr; // Slow-path failed out to a method call
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410
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411 static int _new_instance_ctr; // 'new' object requires GC
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412 static int _new_array_ctr; // 'new' array requires GC
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413 static int _multi1_ctr, _multi2_ctr, _multi3_ctr, _multi4_ctr, _multi5_ctr;
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414 static int _find_handler_ctr; // find exception handler
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415 static int _rethrow_ctr; // rethrow exception
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416 static int _mon_enter_stub_ctr; // monitor enter stub
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417 static int _mon_exit_stub_ctr; // monitor exit stub
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418 static int _mon_enter_ctr; // monitor enter slow
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419 static int _mon_exit_ctr; // monitor exit slow
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420 static int _partial_subtype_ctr; // SubRoutines::partial_subtype_check
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421
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422 // Statistics code
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423 // stats for "normal" compiled calls (non-interface)
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424 static int _nof_normal_calls; // total # of calls
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425 static int _nof_optimized_calls; // total # of statically-bound calls
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426 static int _nof_inlined_calls; // total # of inlined normal calls
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427 static int _nof_static_calls; // total # of calls to static methods or super methods (invokespecial)
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428 static int _nof_inlined_static_calls; // total # of inlined static calls
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429 // stats for compiled interface calls
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430 static int _nof_interface_calls; // total # of compiled calls
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431 static int _nof_optimized_interface_calls; // total # of statically-bound interface calls
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432 static int _nof_inlined_interface_calls; // total # of inlined interface calls
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433 static int _nof_megamorphic_interface_calls;// total # of megamorphic interface calls
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434 // stats for runtime exceptions
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435 static int _nof_removable_exceptions; // total # of exceptions that could be replaced by branches due to inlining
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436
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437 public: // for compiler
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438 static address nof_normal_calls_addr() { return (address)&_nof_normal_calls; }
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439 static address nof_optimized_calls_addr() { return (address)&_nof_optimized_calls; }
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440 static address nof_inlined_calls_addr() { return (address)&_nof_inlined_calls; }
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441 static address nof_static_calls_addr() { return (address)&_nof_static_calls; }
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442 static address nof_inlined_static_calls_addr() { return (address)&_nof_inlined_static_calls; }
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443 static address nof_interface_calls_addr() { return (address)&_nof_interface_calls; }
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444 static address nof_optimized_interface_calls_addr() { return (address)&_nof_optimized_interface_calls; }
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445 static address nof_inlined_interface_calls_addr() { return (address)&_nof_inlined_interface_calls; }
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446 static address nof_megamorphic_interface_calls_addr() { return (address)&_nof_megamorphic_interface_calls; }
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447 static void print_call_statistics(int comp_total);
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448 static void print_statistics();
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449 static void print_ic_miss_histogram();
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450
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451 #endif // PRODUCT
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452 };
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453
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454
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455 // ---------------------------------------------------------------------------
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456 // Implementation of AdapterHandlerLibrary
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457 //
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458 // This library manages argument marshaling adapters and native wrappers.
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459 // There are 2 flavors of adapters: I2C and C2I.
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460 //
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461 // The I2C flavor takes a stock interpreted call setup, marshals the arguments
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462 // for a Java-compiled call, and jumps to Rmethod-> code()->
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463 // instructions_begin(). It is broken to call it without an nmethod assigned.
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464 // The usual behavior is to lift any register arguments up out of the stack
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465 // and possibly re-pack the extra arguments to be contigious. I2C adapters
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466 // will save what the interpreter's stack pointer will be after arguments are
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467 // popped, then adjust the interpreter's frame size to force alignment and
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468 // possibly to repack the arguments. After re-packing, it jumps to the
|
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469 // compiled code start. There are no safepoints in this adapter code and a GC
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470 // cannot happen while marshaling is in progress.
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471 //
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472 // The C2I flavor takes a stock compiled call setup plus the target method in
|
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473 // Rmethod, marshals the arguments for an interpreted call and jumps to
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474 // Rmethod->_i2i_entry. On entry, the interpreted frame has not yet been
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475 // setup. Compiled frames are fixed-size and the args are likely not in the
|
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476 // right place. Hence all the args will likely be copied into the
|
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477 // interpreter's frame, forcing that frame to grow. The compiled frame's
|
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478 // outgoing stack args will be dead after the copy.
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479 //
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480 // Native wrappers, like adapters, marshal arguments. Unlike adapters they
|
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481 // also perform an offical frame push & pop. They have a call to the native
|
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482 // routine in their middles and end in a return (instead of ending in a jump).
|
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483 // The native wrappers are stored in real nmethods instead of the BufferBlobs
|
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484 // used by the adapters. The code generation happens here because it's very
|
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485 // similar to what the adapters have to do.
|
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486
|
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487 class AdapterHandlerEntry : public CHeapObj {
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488 private:
|
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489 address _i2c_entry;
|
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490 address _c2i_entry;
|
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491 address _c2i_unverified_entry;
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492
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493 public:
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494 AdapterHandlerEntry(address i2c_entry, address c2i_entry, address c2i_unverified_entry):
|
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495 _i2c_entry(i2c_entry),
|
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496 _c2i_entry(c2i_entry),
|
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497 _c2i_unverified_entry(c2i_unverified_entry) {
|
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498 }
|
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499 // The name we give all buffer blobs
|
|
500 static const char* name;
|
|
501
|
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502 address get_i2c_entry() { return _i2c_entry; }
|
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503 address get_c2i_entry() { return _c2i_entry; }
|
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504 address get_c2i_unverified_entry() { return _c2i_unverified_entry; }
|
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505 void relocate(address new_base);
|
|
506 #ifndef PRODUCT
|
|
507 void print();
|
|
508 #endif /* PRODUCT */
|
|
509 };
|
|
510
|
|
511
|
|
512 class AdapterHandlerLibrary: public AllStatic {
|
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513 private:
|
|
514 enum {
|
|
515 AbstractMethodHandler = 1 // special handler for abstract methods
|
|
516 };
|
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517 static GrowableArray<uint64_t>* _fingerprints; // the fingerprint collection
|
|
518 static GrowableArray<AdapterHandlerEntry*> * _handlers; // the corresponding handlers
|
|
519 static u_char _buffer[]; // the temporary code buffer
|
|
520 static void initialize();
|
|
521 static AdapterHandlerEntry* get_entry( int index ) { return _handlers->at(index); }
|
|
522 static int get_create_adapter_index(methodHandle method);
|
|
523 static address get_i2c_entry( int index ) { return get_entry(index)->get_i2c_entry(); }
|
|
524 static address get_c2i_entry( int index ) { return get_entry(index)->get_c2i_entry(); }
|
|
525 static address get_c2i_unverified_entry( int index ) { return get_entry(index)->get_c2i_unverified_entry(); }
|
|
526
|
|
527 public:
|
|
528 static nmethod* create_native_wrapper(methodHandle method);
|
|
529 static AdapterHandlerEntry* get_adapter(methodHandle method) { return get_entry(get_create_adapter_index(method)); }
|
|
530
|
|
531 #ifndef PRODUCT
|
|
532 static void print_handler(CodeBlob* b);
|
|
533 static bool contains(CodeBlob* b);
|
|
534 #endif /* PRODUCT */
|
|
535
|
|
536 };
|