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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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605
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25 // This file contains the platform-independent parts
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0
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26 // of the abstract interpreter and the abstract interpreter generator.
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27
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28 // Organization of the interpreter(s). There exists two different interpreters in hotpot
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29 // an assembly language version (aka template interpreter) and a high level language version
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30 // (aka c++ interpreter). Th division of labor is as follows:
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31
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32 // Template Interpreter C++ Interpreter Functionality
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33 //
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34 // templateTable* bytecodeInterpreter* actual interpretation of bytecodes
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35 //
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36 // templateInterpreter* cppInterpreter* generation of assembly code that creates
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37 // and manages interpreter runtime frames.
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38 // Also code for populating interpreter
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39 // frames created during deoptimization.
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40 //
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41 // For both template and c++ interpreter. There are common files for aspects of the interpreter
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42 // that are generic to both interpreters. This is the layout:
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43 //
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44 // abstractInterpreter.hpp: generic description of the interpreter.
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45 // interpreter*: generic frame creation and handling.
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46 //
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47
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48 //------------------------------------------------------------------------------------------------------------------------
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49 // The C++ interface to the bytecode interpreter(s).
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50
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51 class AbstractInterpreter: AllStatic {
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52 friend class VMStructs;
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53 friend class Interpreter;
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54 friend class CppInterpreterGenerator;
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55 public:
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56 enum MethodKind {
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57 zerolocals, // method needs locals initialization
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58 zerolocals_synchronized, // method needs locals initialization & is synchronized
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59 native, // native method
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60 native_synchronized, // native method & is synchronized
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61 empty, // empty method (code: _return)
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62 accessor, // accessor method (code: _aload_0, _getfield, _(a|i)return)
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63 abstract, // abstract method (throws an AbstractMethodException)
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64 java_lang_math_sin, // implementation of java.lang.Math.sin (x)
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65 java_lang_math_cos, // implementation of java.lang.Math.cos (x)
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66 java_lang_math_tan, // implementation of java.lang.Math.tan (x)
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67 java_lang_math_abs, // implementation of java.lang.Math.abs (x)
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68 java_lang_math_sqrt, // implementation of java.lang.Math.sqrt (x)
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69 java_lang_math_log, // implementation of java.lang.Math.log (x)
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70 java_lang_math_log10, // implementation of java.lang.Math.log10 (x)
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71 number_of_method_entries,
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72 invalid = -1
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73 };
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74
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75 enum SomeConstants {
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76 number_of_result_handlers = 10 // number of result handlers for native calls
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77 };
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78
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79 protected:
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80 static StubQueue* _code; // the interpreter code (codelets)
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81
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82 static bool _notice_safepoints; // true if safepoints are activated
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83
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84 static address _native_entry_begin; // Region for native entry code
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85 static address _native_entry_end;
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86
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87 // method entry points
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88 static address _entry_table[number_of_method_entries]; // entry points for a given method
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89 static address _native_abi_to_tosca[number_of_result_handlers]; // for native method result handlers
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90 static address _slow_signature_handler; // the native method generic (slow) signature handler
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91
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92 static address _rethrow_exception_entry; // rethrows an activation in previous frame
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93
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94
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95
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96 friend class AbstractInterpreterGenerator;
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97 friend class InterpreterGenerator;
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98 friend class InterpreterMacroAssembler;
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99
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100 public:
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101 // Initialization/debugging
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102 static void initialize();
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103 static StubQueue* code() { return _code; }
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104
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105
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106 // Method activation
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107 static MethodKind method_kind(methodHandle m);
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108 static address entry_for_kind(MethodKind k) { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
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109 static address entry_for_method(methodHandle m) { return _entry_table[method_kind(m)]; }
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110
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111 static void print_method_kind(MethodKind kind) PRODUCT_RETURN;
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112
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113 // Runtime support
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114
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115 // length = invoke bytecode length (to advance to next bytecode)
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116 static address deopt_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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117 static address return_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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118
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119 static address rethrow_exception_entry() { return _rethrow_exception_entry; }
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120
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121 // Activation size in words for a method that is just being called.
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122 // Parameters haven't been pushed so count them too.
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123 static int size_top_interpreter_activation(methodOop method);
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124
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125 // Deoptimization support
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126 static address continuation_for(methodOop method,
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127 address bcp,
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128 int callee_parameters,
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129 bool is_top_frame,
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130 bool& use_next_mdp);
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131
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132 // share implementation of size_activation and layout_activation:
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133 static int size_activation(methodOop method,
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134 int temps,
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135 int popframe_args,
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136 int monitors,
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137 int callee_params,
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138 int callee_locals,
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139 bool is_top_frame);
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140
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141 static int layout_activation(methodOop method,
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142 int temps,
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143 int popframe_args,
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144 int monitors,
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145 int callee_params,
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146 int callee_locals,
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147 frame* caller,
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148 frame* interpreter_frame,
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149 bool is_top_frame);
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150
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151 // Runtime support
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152 static bool is_not_reached( methodHandle method, int bci);
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153 // Safepoint support
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154 static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
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155 static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints
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156
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157 // Support for native calls
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158 static address slow_signature_handler() { return _slow_signature_handler; }
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159 static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; }
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160 static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table
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161 static bool in_native_entry(address pc) { return _native_entry_begin <= pc && pc < _native_entry_end; }
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162 // Debugging/printing
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163 static void print(); // prints the interpreter code
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164
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165 // Support for Tagged Stacks
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166 //
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167 // Tags are stored on the Java Expression stack above the value:
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168 //
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169 // tag
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170 // value
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171 //
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172 // For double values:
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173 //
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174 // tag2
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175 // high word
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176 // tag1
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177 // low word
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178
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179 public:
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180 static int stackElementWords() { return TaggedStackInterpreter ? 2 : 1; }
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181 static int stackElementSize() { return stackElementWords()*wordSize; }
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182 static int logStackElementSize() { return
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183 TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; }
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184
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185 // Tag is at pointer, value is one below for a stack growing down
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186 // (or above for stack growing up)
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187 static int value_offset_in_bytes() {
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188 return TaggedStackInterpreter ?
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189 frame::interpreter_frame_expression_stack_direction() * wordSize : 0;
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190 }
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191 static int tag_offset_in_bytes() {
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192 assert(TaggedStackInterpreter, "should not call this");
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193 return 0;
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194 }
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195
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196 // Tagged Locals
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197 // Locals are stored relative to Llocals:
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198 //
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199 // tag <- Llocals[n]
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200 // value
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201 //
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202 // Category 2 types are indexed as:
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203 //
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204 // tag <- Llocals[-n]
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205 // high word
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206 // tag <- Llocals[-n+1]
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207 // low word
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208 //
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209
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210 // Local values relative to locals[n]
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211 static int local_offset_in_bytes(int n) {
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212 return ((frame::interpreter_frame_expression_stack_direction() * n) *
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213 stackElementSize()) + value_offset_in_bytes();
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214 }
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215 static int local_tag_offset_in_bytes(int n) {
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216 assert(TaggedStackInterpreter, "should not call this");
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217 return ((frame::interpreter_frame_expression_stack_direction() * n) *
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218 stackElementSize()) + tag_offset_in_bytes();
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219 }
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220
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221 };
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222
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223 //------------------------------------------------------------------------------------------------------------------------
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224 // The interpreter generator.
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225
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226 class Template;
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227 class AbstractInterpreterGenerator: public StackObj {
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228 protected:
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229 InterpreterMacroAssembler* _masm;
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230
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231 // shared code sequences
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232 // Converter for native abi result to tosca result
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233 address generate_result_handler_for(BasicType type);
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234 address generate_slow_signature_handler();
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235
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236 // entry point generator
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237 address generate_method_entry(AbstractInterpreter::MethodKind kind);
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238
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239 void bang_stack_shadow_pages(bool native_call);
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240
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241 void generate_all();
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242
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243 public:
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244 AbstractInterpreterGenerator(StubQueue* _code);
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245 };
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