1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 // This file contains the platform-independent parts 26 // of the abstract interpreter and the abstract interpreter generator. 27 28 // Organization of the interpreter(s). There exists two different interpreters in hotpot 29 // an assembly language version (aka template interpreter) and a high level language version 30 // (aka c++ interpreter). Th division of labor is as follows: 31 32 // Template Interpreter C++ Interpreter Functionality 33 // 34 // templateTable* bytecodeInterpreter* actual interpretation of bytecodes 35 // 36 // templateInterpreter* cppInterpreter* generation of assembly code that creates 37 // and manages interpreter runtime frames. 38 // Also code for populating interpreter 39 // frames created during deoptimization. 40 // 41 // For both template and c++ interpreter. There are common files for aspects of the interpreter 42 // that are generic to both interpreters. This is the layout: 43 // 44 // abstractInterpreter.hpp: generic description of the interpreter. 45 // interpreter*: generic frame creation and handling. 46 // 47 48 //------------------------------------------------------------------------------------------------------------------------ 49 // The C++ interface to the bytecode interpreter(s). 50 51 class AbstractInterpreter: AllStatic { 52 friend class VMStructs; 53 friend class Interpreter; 54 friend class CppInterpreterGenerator; 55 public: 56 enum MethodKind { 57 zerolocals, // method needs locals initialization 58 zerolocals_synchronized, // method needs locals initialization & is synchronized 59 native, // native method 60 native_synchronized, // native method & is synchronized 61 empty, // empty method (code: _return) 62 accessor, // accessor method (code: _aload_0, _getfield, _(a|i)return) 63 abstract, // abstract method (throws an AbstractMethodException) 64 method_handle, // java.dyn.MethodHandles::invoke 65 java_lang_math_sin, // implementation of java.lang.Math.sin (x) 66 java_lang_math_cos, // implementation of java.lang.Math.cos (x) 67 java_lang_math_tan, // implementation of java.lang.Math.tan (x) 68 java_lang_math_abs, // implementation of java.lang.Math.abs (x) 69 java_lang_math_sqrt, // implementation of java.lang.Math.sqrt (x) 70 java_lang_math_log, // implementation of java.lang.Math.log (x) 71 java_lang_math_log10, // implementation of java.lang.Math.log10 (x) 72 number_of_method_entries, 73 invalid = -1 74 }; 75 76 enum SomeConstants { 77 number_of_result_handlers = 10 // number of result handlers for native calls 78 }; 79 80 protected: 81 static StubQueue* _code; // the interpreter code (codelets) 82 83 static bool _notice_safepoints; // true if safepoints are activated 84 85 static address _native_entry_begin; // Region for native entry code 86 static address _native_entry_end; 87 88 // method entry points 89 static address _entry_table[number_of_method_entries]; // entry points for a given method 90 static address _native_abi_to_tosca[number_of_result_handlers]; // for native method result handlers 91 static address _slow_signature_handler; // the native method generic (slow) signature handler 92 93 static address _rethrow_exception_entry; // rethrows an activation in previous frame 94 95 friend class AbstractInterpreterGenerator; 96 friend class InterpreterGenerator; 97 friend class InterpreterMacroAssembler; 98 99 public: 100 // Initialization/debugging 101 static void initialize(); 102 static StubQueue* code() { return _code; } 103 104 105 // Method activation 106 static MethodKind method_kind(methodHandle m); 107 static address entry_for_kind(MethodKind k) { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; } 108 static address entry_for_method(methodHandle m) { return _entry_table[method_kind(m)]; } 109 110 static void print_method_kind(MethodKind kind) PRODUCT_RETURN; 111 112 // Runtime support 113 114 // length = invoke bytecode length (to advance to next bytecode) 115 static address deopt_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; } 116 static address return_entry (TosState state, int length) { ShouldNotReachHere(); return NULL; } 117 118 static address rethrow_exception_entry() { return _rethrow_exception_entry; } 119 120 // Activation size in words for a method that is just being called. 121 // Parameters haven't been pushed so count them too. 122 static int size_top_interpreter_activation(methodOop method); 123 124 // Deoptimization support 125 static address continuation_for(methodOop method, 126 address bcp, 127 int callee_parameters, 128 bool is_top_frame, 129 bool& use_next_mdp); 130 131 // share implementation of size_activation and layout_activation: 132 static int size_activation(methodOop method, 133 int temps, 134 int popframe_args, 135 int monitors, 136 int callee_params, 137 int callee_locals, 138 bool is_top_frame); 139 140 static int layout_activation(methodOop method, 141 int temps, 142 int popframe_args, 143 int monitors, 144 int callee_params, 145 int callee_locals, 146 frame* caller, 147 frame* interpreter_frame, 148 bool is_top_frame); 149 150 // Runtime support 151 static bool is_not_reached( methodHandle method, int bci); 152 // Safepoint support 153 static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint 154 static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints 155 156 // Support for native calls 157 static address slow_signature_handler() { return _slow_signature_handler; } 158 static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; } 159 static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table 160 static bool in_native_entry(address pc) { return _native_entry_begin <= pc && pc < _native_entry_end; } 161 // Debugging/printing 162 static void print(); // prints the interpreter code 163 164 // Support for Tagged Stacks 165 // 166 // Tags are stored on the Java Expression stack above the value: 167 // 168 // tag 169 // value 170 // 171 // For double values: 172 // 173 // tag2 174 // high word 175 // tag1 176 // low word 177 178 public: 179 static int stackElementWords() { return TaggedStackInterpreter ? 2 : 1; } 180 static int stackElementSize() { return stackElementWords()*wordSize; } 181 static int logStackElementSize() { return 182 TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; } 183 184 // Tag is at pointer, value is one below for a stack growing down 185 // (or above for stack growing up) 186 static int value_offset_in_bytes() { 187 return TaggedStackInterpreter ? 188 frame::interpreter_frame_expression_stack_direction() * wordSize : 0; 189 } 190 static int tag_offset_in_bytes() { 191 assert(TaggedStackInterpreter, "should not call this"); 192 return 0; 193 } 194 195 // Tagged Locals 196 // Locals are stored relative to Llocals: 197 // 198 // tag <- Llocals[n] 199 // value 200 // 201 // Category 2 types are indexed as: 202 // 203 // tag <- Llocals[-n] 204 // high word 205 // tag <- Llocals[-n+1] 206 // low word 207 // 208 209 // Local values relative to locals[n] 210 static int local_offset_in_bytes(int n) { 211 return ((frame::interpreter_frame_expression_stack_direction() * n) * 212 stackElementSize()) + value_offset_in_bytes(); 213 } 214 static int local_tag_offset_in_bytes(int n) { 215 assert(TaggedStackInterpreter, "should not call this"); 216 return ((frame::interpreter_frame_expression_stack_direction() * n) * 217 stackElementSize()) + tag_offset_in_bytes(); 218 } 219 220 // access to stacked values according to type: 221 static oop* oop_addr_in_slot(intptr_t* slot_addr) { 222 return (oop*) slot_addr; 223 } 224 static jint* int_addr_in_slot(intptr_t* slot_addr) { 225 if ((int) sizeof(jint) < wordSize && !Bytes::is_Java_byte_ordering_different()) 226 // big-endian LP64 227 return (jint*)(slot_addr + 1) - 1; 228 else 229 return (jint*) slot_addr; 230 } 231 static jlong long_in_slot(intptr_t* slot_addr) { 232 if (sizeof(intptr_t) >= sizeof(jlong)) { 233 return *(jlong*) slot_addr; 234 } else if (!TaggedStackInterpreter) { 235 return Bytes::get_native_u8((address)slot_addr); 236 } else { 237 assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32"); 238 // assemble the long in memory order (not arithmetic order) 239 union { jlong j; jint i[2]; } u; 240 u.i[0] = (jint) slot_addr[0*stackElementSize()]; 241 u.i[1] = (jint) slot_addr[1*stackElementSize()]; 242 return u.j; 243 } 244 } 245 static void set_long_in_slot(intptr_t* slot_addr, jlong value) { 246 if (sizeof(intptr_t) >= sizeof(jlong)) { 247 *(jlong*) slot_addr = value; 248 } else if (!TaggedStackInterpreter) { 249 Bytes::put_native_u8((address)slot_addr, value); 250 } else { 251 assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32"); 252 // assemble the long in memory order (not arithmetic order) 253 union { jlong j; jint i[2]; } u; 254 u.j = value; 255 slot_addr[0*stackElementSize()] = (intptr_t) u.i[0]; 256 slot_addr[1*stackElementSize()] = (intptr_t) u.i[1]; 257 } 258 } 259 static void get_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) { 260 switch (type) { 261 case T_BOOLEAN: value->z = *int_addr_in_slot(slot_addr); break; 262 case T_CHAR: value->c = *int_addr_in_slot(slot_addr); break; 263 case T_BYTE: value->b = *int_addr_in_slot(slot_addr); break; 264 case T_SHORT: value->s = *int_addr_in_slot(slot_addr); break; 265 case T_INT: value->i = *int_addr_in_slot(slot_addr); break; 266 case T_LONG: value->j = long_in_slot(slot_addr); break; 267 case T_FLOAT: value->f = *(jfloat*)int_addr_in_slot(slot_addr); break; 268 case T_DOUBLE: value->d = jdouble_cast(long_in_slot(slot_addr)); break; 269 case T_OBJECT: value->l = (jobject)*oop_addr_in_slot(slot_addr); break; 270 default: ShouldNotReachHere(); 271 } 272 } 273 static void set_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) { 274 switch (type) { 275 case T_BOOLEAN: *int_addr_in_slot(slot_addr) = (value->z != 0); break; 276 case T_CHAR: *int_addr_in_slot(slot_addr) = value->c; break; 277 case T_BYTE: *int_addr_in_slot(slot_addr) = value->b; break; 278 case T_SHORT: *int_addr_in_slot(slot_addr) = value->s; break; 279 case T_INT: *int_addr_in_slot(slot_addr) = value->i; break; 280 case T_LONG: set_long_in_slot(slot_addr, value->j); break; 281 case T_FLOAT: *(jfloat*)int_addr_in_slot(slot_addr) = value->f; break; 282 case T_DOUBLE: set_long_in_slot(slot_addr, jlong_cast(value->d)); break; 283 case T_OBJECT: *oop_addr_in_slot(slot_addr) = (oop) value->l; break; 284 default: ShouldNotReachHere(); 285 } 286 } 287 }; 288 289 //------------------------------------------------------------------------------------------------------------------------ 290 // The interpreter generator. 291 292 class Template; 293 class AbstractInterpreterGenerator: public StackObj { 294 protected: 295 InterpreterMacroAssembler* _masm; 296 297 // shared code sequences 298 // Converter for native abi result to tosca result 299 address generate_result_handler_for(BasicType type); 300 address generate_slow_signature_handler(); 301 302 // entry point generator 303 address generate_method_entry(AbstractInterpreter::MethodKind kind); 304 305 void bang_stack_shadow_pages(bool native_call); 306 307 void generate_all(); 308 309 public: 310 AbstractInterpreterGenerator(StubQueue* _code); 311 };