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1 /*
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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 // This file contains the platform-independent parts
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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 method_handle, // java.dyn.MethodHandles::invoke
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65 java_lang_math_sin, // implementation of java.lang.Math.sin (x)
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66 java_lang_math_cos, // implementation of java.lang.Math.cos (x)
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67 java_lang_math_tan, // implementation of java.lang.Math.tan (x)
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68 java_lang_math_abs, // implementation of java.lang.Math.abs (x)
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69 java_lang_math_sqrt, // implementation of java.lang.Math.sqrt (x)
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70 java_lang_math_log, // implementation of java.lang.Math.log (x)
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71 java_lang_math_log10, // implementation of java.lang.Math.log10 (x)
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72 number_of_method_entries,
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73 invalid = -1
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74 };
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75
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76 enum SomeConstants {
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77 number_of_result_handlers = 10 // number of result handlers for native calls
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78 };
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79
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80 protected:
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81 static StubQueue* _code; // the interpreter code (codelets)
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82
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83 static bool _notice_safepoints; // true if safepoints are activated
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84
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85 static address _native_entry_begin; // Region for native entry code
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86 static address _native_entry_end;
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87
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88 // method entry points
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89 static address _entry_table[number_of_method_entries]; // entry points for a given method
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90 static address _native_abi_to_tosca[number_of_result_handlers]; // for native method result handlers
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91 static address _slow_signature_handler; // the native method generic (slow) signature handler
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92
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93 static address _rethrow_exception_entry; // rethrows an activation in previous frame
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94
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95 friend class AbstractInterpreterGenerator;
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96 friend class InterpreterGenerator;
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97 friend class InterpreterMacroAssembler;
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98
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99 public:
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100 // Initialization/debugging
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101 static void initialize();
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102 static StubQueue* code() { return _code; }
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103
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104
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105 // Method activation
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106 static MethodKind method_kind(methodHandle m);
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107 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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108 static address entry_for_method(methodHandle m) { return _entry_table[method_kind(m)]; }
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109
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110 static void print_method_kind(MethodKind kind) PRODUCT_RETURN;
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111
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112 // Runtime support
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113
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114 // length = invoke bytecode length (to advance to next bytecode)
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115 static address deopt_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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116 static address return_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; }
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117
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118 static address rethrow_exception_entry() { return _rethrow_exception_entry; }
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119
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120 // Activation size in words for a method that is just being called.
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121 // Parameters haven't been pushed so count them too.
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122 static int size_top_interpreter_activation(methodOop method);
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123
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124 // Deoptimization support
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125 static address continuation_for(methodOop method,
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126 address bcp,
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127 int callee_parameters,
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128 bool is_top_frame,
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129 bool& use_next_mdp);
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130
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131 // share implementation of size_activation and layout_activation:
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132 static int size_activation(methodOop method,
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133 int temps,
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134 int popframe_args,
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135 int monitors,
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136 int callee_params,
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137 int callee_locals,
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138 bool is_top_frame);
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139
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140 static int layout_activation(methodOop method,
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141 int temps,
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142 int popframe_args,
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143 int monitors,
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144 int callee_params,
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145 int callee_locals,
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146 frame* caller,
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147 frame* interpreter_frame,
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148 bool is_top_frame);
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149
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150 // Runtime support
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151 static bool is_not_reached( methodHandle method, int bci);
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152 // Safepoint support
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153 static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
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154 static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints
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155
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156 // Support for native calls
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157 static address slow_signature_handler() { return _slow_signature_handler; }
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158 static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; }
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159 static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table
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160 static bool in_native_entry(address pc) { return _native_entry_begin <= pc && pc < _native_entry_end; }
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161 // Debugging/printing
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162 static void print(); // prints the interpreter code
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163
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164 // Support for Tagged Stacks
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165 //
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166 // Tags are stored on the Java Expression stack above the value:
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167 //
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168 // tag
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169 // value
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170 //
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171 // For double values:
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172 //
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173 // tag2
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174 // high word
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175 // tag1
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176 // low word
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177
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178 public:
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179 static int stackElementWords() { return TaggedStackInterpreter ? 2 : 1; }
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180 static int stackElementSize() { return stackElementWords()*wordSize; }
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181 static int logStackElementSize() { return
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182 TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; }
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183
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184 // Tag is at pointer, value is one below for a stack growing down
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185 // (or above for stack growing up)
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186 static int value_offset_in_bytes() {
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187 return TaggedStackInterpreter ?
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188 frame::interpreter_frame_expression_stack_direction() * wordSize : 0;
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189 }
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190 static int tag_offset_in_bytes() {
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191 assert(TaggedStackInterpreter, "should not call this");
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192 return 0;
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193 }
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194
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195 // Tagged Locals
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196 // Locals are stored relative to Llocals:
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197 //
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198 // tag <- Llocals[n]
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199 // value
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200 //
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201 // Category 2 types are indexed as:
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202 //
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203 // tag <- Llocals[-n]
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204 // high word
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205 // tag <- Llocals[-n+1]
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206 // low word
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207 //
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208
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209 // Local values relative to locals[n]
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210 static int local_offset_in_bytes(int n) {
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211 return ((frame::interpreter_frame_expression_stack_direction() * n) *
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212 stackElementSize()) + value_offset_in_bytes();
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213 }
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214 static int local_tag_offset_in_bytes(int n) {
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215 assert(TaggedStackInterpreter, "should not call this");
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216 return ((frame::interpreter_frame_expression_stack_direction() * n) *
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217 stackElementSize()) + tag_offset_in_bytes();
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218 }
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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 // The interpreter generator.
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224
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225 class Template;
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226 class AbstractInterpreterGenerator: public StackObj {
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227 protected:
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228 InterpreterMacroAssembler* _masm;
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229
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230 // shared code sequences
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231 // Converter for native abi result to tosca result
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232 address generate_result_handler_for(BasicType type);
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233 address generate_slow_signature_handler();
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234
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235 // entry point generator
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236 address generate_method_entry(AbstractInterpreter::MethodKind kind);
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237
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238 void bang_stack_shadow_pages(bool native_call);
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239
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240 void generate_all();
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241
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242 public:
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243 AbstractInterpreterGenerator(StubQueue* _code);
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244 };
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