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1 /*
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710
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2 * Copyright 1997-2009 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/_interpreter.cpp.incl"
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27
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28 # define __ _masm->
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29
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30
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31 //------------------------------------------------------------------------------------------------------------------------
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32 // Implementation of InterpreterCodelet
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33
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34 void InterpreterCodelet::initialize(const char* description, Bytecodes::Code bytecode) {
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35 _description = description;
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36 _bytecode = bytecode;
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37 }
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38
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39
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40 void InterpreterCodelet::verify() {
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41 }
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42
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43
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44 void InterpreterCodelet::print() {
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45 if (PrintInterpreter) {
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46 tty->cr();
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47 tty->print_cr("----------------------------------------------------------------------");
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48 }
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49
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50 if (description() != NULL) tty->print("%s ", description());
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51 if (bytecode() >= 0 ) tty->print("%d %s ", bytecode(), Bytecodes::name(bytecode()));
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52 tty->print_cr("[" INTPTR_FORMAT ", " INTPTR_FORMAT "] %d bytes",
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53 code_begin(), code_end(), code_size());
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54
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55 if (PrintInterpreter) {
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56 tty->cr();
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57 Disassembler::decode(code_begin(), code_end(), tty);
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58 }
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59 }
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60
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61
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62 //------------------------------------------------------------------------------------------------------------------------
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63 // Implementation of platform independent aspects of Interpreter
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64
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65 void AbstractInterpreter::initialize() {
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66 if (_code != NULL) return;
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67
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68 // make sure 'imported' classes are initialized
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69 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset();
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70 if (PrintBytecodeHistogram) BytecodeHistogram::reset();
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71 if (PrintBytecodePairHistogram) BytecodePairHistogram::reset();
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72
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73 InvocationCounter::reinitialize(DelayCompilationDuringStartup);
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74
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75 }
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76
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77 void AbstractInterpreter::print() {
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78 tty->cr();
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79 tty->print_cr("----------------------------------------------------------------------");
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80 tty->print_cr("Interpreter");
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81 tty->cr();
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82 tty->print_cr("code size = %6dK bytes", (int)_code->used_space()/1024);
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83 tty->print_cr("total space = %6dK bytes", (int)_code->total_space()/1024);
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84 tty->print_cr("wasted space = %6dK bytes", (int)_code->available_space()/1024);
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85 tty->cr();
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86 tty->print_cr("# of codelets = %6d" , _code->number_of_stubs());
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87 tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs());
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88 tty->cr();
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89 _code->print();
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90 tty->print_cr("----------------------------------------------------------------------");
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91 tty->cr();
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92 }
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93
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94
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95 void interpreter_init() {
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96 Interpreter::initialize();
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97 #ifndef PRODUCT
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98 if (TraceBytecodes) BytecodeTracer::set_closure(BytecodeTracer::std_closure());
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99 #endif // PRODUCT
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100 // need to hit every safepoint in order to call zapping routine
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101 // register the interpreter
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102 VTune::register_stub(
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103 "Interpreter",
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104 AbstractInterpreter::code()->code_start(),
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105 AbstractInterpreter::code()->code_end()
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106 );
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107 Forte::register_stub(
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108 "Interpreter",
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109 AbstractInterpreter::code()->code_start(),
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110 AbstractInterpreter::code()->code_end()
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111 );
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112
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113 // notify JVMTI profiler
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114 if (JvmtiExport::should_post_dynamic_code_generated()) {
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115 JvmtiExport::post_dynamic_code_generated("Interpreter",
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116 AbstractInterpreter::code()->code_start(),
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117 AbstractInterpreter::code()->code_end());
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118 }
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119 }
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120
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121 //------------------------------------------------------------------------------------------------------------------------
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122 // Implementation of interpreter
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123
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124 StubQueue* AbstractInterpreter::_code = NULL;
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125 bool AbstractInterpreter::_notice_safepoints = false;
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126 address AbstractInterpreter::_rethrow_exception_entry = NULL;
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127
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128 address AbstractInterpreter::_native_entry_begin = NULL;
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129 address AbstractInterpreter::_native_entry_end = NULL;
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130 address AbstractInterpreter::_slow_signature_handler;
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131 address AbstractInterpreter::_entry_table [AbstractInterpreter::number_of_method_entries];
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132 address AbstractInterpreter::_native_abi_to_tosca [AbstractInterpreter::number_of_result_handlers];
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133
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134 //------------------------------------------------------------------------------------------------------------------------
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135 // Generation of complete interpreter
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136
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137 AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) {
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138 _masm = NULL;
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139 }
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140
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141
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142 static const BasicType types[Interpreter::number_of_result_handlers] = {
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143 T_BOOLEAN,
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144 T_CHAR ,
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145 T_BYTE ,
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146 T_SHORT ,
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147 T_INT ,
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148 T_LONG ,
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149 T_VOID ,
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150 T_FLOAT ,
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151 T_DOUBLE ,
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152 T_OBJECT
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153 };
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154
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155 void AbstractInterpreterGenerator::generate_all() {
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156
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157
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158 { CodeletMark cm(_masm, "slow signature handler");
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159 Interpreter::_slow_signature_handler = generate_slow_signature_handler();
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160 }
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161
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162 }
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163
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164 //------------------------------------------------------------------------------------------------------------------------
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165 // Entry points
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166
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167 AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) {
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168 // Abstract method?
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169 if (m->is_abstract()) return abstract;
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170
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710
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171 // Invoker for method handles?
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172 if (m->is_method_handle_invoke()) return method_handle;
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173
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174 // Native method?
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175 // Note: This test must come _before_ the test for intrinsic
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176 // methods. See also comments below.
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177 if (m->is_native()) {
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178 assert(!m->is_method_handle_invoke(), "overlapping bits here, watch out");
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179 return m->is_synchronized() ? native_synchronized : native;
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180 }
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181
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182 // Synchronized?
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183 if (m->is_synchronized()) {
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184 return zerolocals_synchronized;
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185 }
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186
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187 if (RegisterFinalizersAtInit && m->code_size() == 1 &&
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188 m->intrinsic_id() == vmIntrinsics::_Object_init) {
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189 // We need to execute the special return bytecode to check for
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190 // finalizer registration so create a normal frame.
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191 return zerolocals;
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192 }
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193
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194 // Empty method?
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195 if (m->is_empty_method()) {
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196 return empty;
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197 }
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198
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199 // Accessor method?
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200 if (m->is_accessor()) {
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201 assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
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202 return accessor;
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203 }
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204
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205 // Special intrinsic method?
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206 // Note: This test must come _after_ the test for native methods,
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207 // otherwise we will run into problems with JDK 1.2, see also
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208 // AbstractInterpreterGenerator::generate_method_entry() for
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209 // for details.
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210 switch (m->intrinsic_id()) {
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211 case vmIntrinsics::_dsin : return java_lang_math_sin ;
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212 case vmIntrinsics::_dcos : return java_lang_math_cos ;
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213 case vmIntrinsics::_dtan : return java_lang_math_tan ;
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214 case vmIntrinsics::_dabs : return java_lang_math_abs ;
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215 case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
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216 case vmIntrinsics::_dlog : return java_lang_math_log ;
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217 case vmIntrinsics::_dlog10: return java_lang_math_log10;
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218 }
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219
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220 // Note: for now: zero locals for all non-empty methods
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221 return zerolocals;
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222 }
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223
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224
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225 // Return true if the interpreter can prove that the given bytecode has
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226 // not yet been executed (in Java semantics, not in actual operation).
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227 bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) {
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228 address bcp = method->bcp_from(bci);
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229
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230 if (!Bytecode_at(bcp)->must_rewrite()) {
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231 // might have been reached
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232 return false;
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233 }
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234
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235 // the bytecode might not be rewritten if the method is an accessor, etc.
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236 address ientry = method->interpreter_entry();
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237 if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) &&
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238 ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized))
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239 return false; // interpreter does not run this method!
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240
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241 // otherwise, we can be sure this bytecode has never been executed
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242 return true;
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243 }
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244
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245
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246 #ifndef PRODUCT
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247 void AbstractInterpreter::print_method_kind(MethodKind kind) {
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248 switch (kind) {
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249 case zerolocals : tty->print("zerolocals" ); break;
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250 case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break;
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251 case native : tty->print("native" ); break;
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252 case native_synchronized : tty->print("native_synchronized" ); break;
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253 case empty : tty->print("empty" ); break;
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254 case accessor : tty->print("accessor" ); break;
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255 case abstract : tty->print("abstract" ); break;
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256 case method_handle : tty->print("method_handle" ); break;
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257 case java_lang_math_sin : tty->print("java_lang_math_sin" ); break;
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258 case java_lang_math_cos : tty->print("java_lang_math_cos" ); break;
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259 case java_lang_math_tan : tty->print("java_lang_math_tan" ); break;
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260 case java_lang_math_abs : tty->print("java_lang_math_abs" ); break;
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261 case java_lang_math_sqrt : tty->print("java_lang_math_sqrt" ); break;
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262 case java_lang_math_log : tty->print("java_lang_math_log" ); break;
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263 case java_lang_math_log10 : tty->print("java_lang_math_log10" ); break;
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264 default : ShouldNotReachHere();
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265 }
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266 }
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267 #endif // PRODUCT
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268
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269 static BasicType constant_pool_type(methodOop method, int index) {
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270 constantTag tag = method->constants()->tag_at(index);
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271 if (tag.is_int ()) return T_INT;
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272 else if (tag.is_float ()) return T_FLOAT;
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273 else if (tag.is_long ()) return T_LONG;
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274 else if (tag.is_double ()) return T_DOUBLE;
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275 else if (tag.is_string ()) return T_OBJECT;
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276 else if (tag.is_unresolved_string()) return T_OBJECT;
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277 else if (tag.is_klass ()) return T_OBJECT;
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278 else if (tag.is_unresolved_klass ()) return T_OBJECT;
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279 ShouldNotReachHere();
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280 return T_ILLEGAL;
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281 }
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282
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283
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284 //------------------------------------------------------------------------------------------------------------------------
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285 // Deoptimization support
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286
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287 // If deoptimization happens, this method returns the point where to continue in
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288 // interpreter. For calls (invokexxxx, newxxxx) the continuation is at next
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289 // bci and the top of stack is in eax/edx/FPU tos.
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290 // For putfield/getfield, put/getstatic, the continuation is at the same
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291 // bci and the TOS is on stack.
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292
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293 // Note: deopt_entry(type, 0) means reexecute bytecode
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294 // deopt_entry(type, length) means continue at next bytecode
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295
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296 address AbstractInterpreter::continuation_for(methodOop method, address bcp, int callee_parameters, bool is_top_frame, bool& use_next_mdp) {
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297 assert(method->contains(bcp), "just checkin'");
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298 Bytecodes::Code code = Bytecodes::java_code_at(bcp);
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299 int bci = method->bci_from(bcp);
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300 int length = -1; // initial value for debugging
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301 // compute continuation length
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302 length = Bytecodes::length_at(bcp);
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303 // compute result type
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304 BasicType type = T_ILLEGAL;
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305 // when continuing after a compiler safepoint, re-execute the bytecode
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306 // (an invoke is continued after the safepoint)
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307 use_next_mdp = true;
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308 switch (code) {
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309 case Bytecodes::_lookupswitch:
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310 case Bytecodes::_tableswitch:
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311 case Bytecodes::_fast_binaryswitch:
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312 case Bytecodes::_fast_linearswitch:
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313 // recompute condtional expression folded into _if<cond>
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314 case Bytecodes::_lcmp :
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315 case Bytecodes::_fcmpl :
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316 case Bytecodes::_fcmpg :
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317 case Bytecodes::_dcmpl :
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318 case Bytecodes::_dcmpg :
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319 case Bytecodes::_ifnull :
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320 case Bytecodes::_ifnonnull :
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321 case Bytecodes::_goto :
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322 case Bytecodes::_goto_w :
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323 case Bytecodes::_ifeq :
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324 case Bytecodes::_ifne :
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325 case Bytecodes::_iflt :
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326 case Bytecodes::_ifge :
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327 case Bytecodes::_ifgt :
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328 case Bytecodes::_ifle :
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329 case Bytecodes::_if_icmpeq :
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330 case Bytecodes::_if_icmpne :
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331 case Bytecodes::_if_icmplt :
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332 case Bytecodes::_if_icmpge :
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333 case Bytecodes::_if_icmpgt :
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334 case Bytecodes::_if_icmple :
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335 case Bytecodes::_if_acmpeq :
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336 case Bytecodes::_if_acmpne :
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337 // special cases
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338 case Bytecodes::_getfield :
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339 case Bytecodes::_putfield :
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340 case Bytecodes::_getstatic :
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341 case Bytecodes::_putstatic :
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342 case Bytecodes::_aastore :
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343 // reexecute the operation and TOS value is on stack
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344 assert(is_top_frame, "must be top frame");
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345 use_next_mdp = false;
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346 return Interpreter::deopt_entry(vtos, 0);
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347 break;
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348
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349 #ifdef COMPILER1
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350 case Bytecodes::_athrow :
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351 assert(is_top_frame, "must be top frame");
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352 use_next_mdp = false;
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353 return Interpreter::rethrow_exception_entry();
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354 break;
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355 #endif /* COMPILER1 */
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356
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357 case Bytecodes::_invokevirtual :
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358 case Bytecodes::_invokespecial :
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359 case Bytecodes::_invokestatic :
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360 case Bytecodes::_invokeinterface: {
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361 Thread *thread = Thread::current();
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362 ResourceMark rm(thread);
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363 methodHandle mh(thread, method);
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364 type = Bytecode_invoke_at(mh, bci)->result_type(thread);
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365 // since the cache entry might not be initialized:
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366 // (NOT needed for the old calling convension)
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367 if (!is_top_frame) {
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368 int index = Bytes::get_native_u2(bcp+1);
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369 method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
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370 }
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371 break;
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372 }
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373
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374 case Bytecodes::_ldc :
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375 type = constant_pool_type( method, *(bcp+1) );
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376 break;
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377
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378 case Bytecodes::_ldc_w : // fall through
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379 case Bytecodes::_ldc2_w:
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380 type = constant_pool_type( method, Bytes::get_Java_u2(bcp+1) );
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381 break;
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382
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383 default:
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384 type = Bytecodes::result_type(code);
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385 break;
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386 }
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387
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388 // return entry point for computed continuation state & bytecode length
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389 return
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390 is_top_frame
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391 ? Interpreter::deopt_entry (as_TosState(type), length)
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392 : Interpreter::return_entry(as_TosState(type), length);
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393 }
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394
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395 void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
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396 // Quick & dirty stack overflow checking: bang the stack & handle trap.
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397 // Note that we do the banging after the frame is setup, since the exception
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398 // handling code expects to find a valid interpreter frame on the stack.
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399 // Doing the banging earlier fails if the caller frame is not an interpreter
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400 // frame.
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401 // (Also, the exception throwing code expects to unlock any synchronized
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402 // method receiever, so do the banging after locking the receiver.)
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403
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404 // Bang each page in the shadow zone. We can't assume it's been done for
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405 // an interpreter frame with greater than a page of locals, so each page
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406 // needs to be checked. Only true for non-native.
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407 if (UseStackBanging) {
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408 const int start_page = native_call ? StackShadowPages : 1;
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409 const int page_size = os::vm_page_size();
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410 for (int pages = start_page; pages <= StackShadowPages ; pages++) {
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411 __ bang_stack_with_offset(pages*page_size);
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412 }
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413 }
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414 }
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