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 // Compute the entry address for continuation after 126 static address deopt_continue_after_entry(methodOop method, 127 address bcp, 128 int callee_parameters, 129 bool is_top_frame); 130 // Compute the entry address for reexecution 131 static address deopt_reexecute_entry(methodOop method, address bcp); 132 // Deoptimization should reexecute this bytecode 133 static bool bytecode_should_reexecute(Bytecodes::Code code); 134 135 // share implementation of size_activation and layout_activation: 136 static int size_activation(methodOop method, 137 int temps, 138 int popframe_args, 139 int monitors, 140 int callee_params, 141 int callee_locals, 142 bool is_top_frame); 143 144 static int layout_activation(methodOop method, 145 int temps, 146 int popframe_args, 147 int monitors, 148 int callee_params, 149 int callee_locals, 150 frame* caller, 151 frame* interpreter_frame, 152 bool is_top_frame); 153 154 // Runtime support 155 static bool is_not_reached( methodHandle method, int bci); 156 // Safepoint support 157 static void notice_safepoints() { ShouldNotReachHere(); } // stops the thread when reaching a safepoint 158 static void ignore_safepoints() { ShouldNotReachHere(); } // ignores safepoints 159 160 // Support for native calls 161 static address slow_signature_handler() { return _slow_signature_handler; } 162 static address result_handler(BasicType type) { return _native_abi_to_tosca[BasicType_as_index(type)]; } 163 static int BasicType_as_index(BasicType type); // computes index into result_handler_by_index table 164 static bool in_native_entry(address pc) { return _native_entry_begin <= pc && pc < _native_entry_end; } 165 // Debugging/printing 166 static void print(); // prints the interpreter code 167 168 // Support for Tagged Stacks 169 // 170 // Tags are stored on the Java Expression stack above the value: 171 // 172 // tag 173 // value 174 // 175 // For double values: 176 // 177 // tag2 178 // high word 179 // tag1 180 // low word 181 182 public: 183 static int stackElementWords() { return TaggedStackInterpreter ? 2 : 1; } 184 static int stackElementSize() { return stackElementWords()*wordSize; } 185 static int logStackElementSize() { return 186 TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; } 187 188 // Tag is at pointer, value is one below for a stack growing down 189 // (or above for stack growing up) 190 static int value_offset_in_bytes() { 191 return TaggedStackInterpreter ? 192 frame::interpreter_frame_expression_stack_direction() * wordSize : 0; 193 } 194 static int tag_offset_in_bytes() { 195 assert(TaggedStackInterpreter, "should not call this"); 196 return 0; 197 } 198 199 // Tagged Locals 200 // Locals are stored relative to Llocals: 201 // 202 // tag <- Llocals[n] 203 // value 204 // 205 // Category 2 types are indexed as: 206 // 207 // tag <- Llocals[-n] 208 // high word 209 // tag <- Llocals[-n+1] 210 // low word 211 // 212 213 // Local values relative to locals[n] 214 static int local_offset_in_bytes(int n) { 215 return ((frame::interpreter_frame_expression_stack_direction() * n) * 216 stackElementSize()) + value_offset_in_bytes(); 217 } 218 static int local_tag_offset_in_bytes(int n) { 219 assert(TaggedStackInterpreter, "should not call this"); 220 return ((frame::interpreter_frame_expression_stack_direction() * n) * 221 stackElementSize()) + tag_offset_in_bytes(); 222 } 223 224 // access to stacked values according to type: 225 static oop* oop_addr_in_slot(intptr_t* slot_addr) { 226 return (oop*) slot_addr; 227 } 228 static jint* int_addr_in_slot(intptr_t* slot_addr) { 229 if ((int) sizeof(jint) < wordSize && !Bytes::is_Java_byte_ordering_different()) 230 // big-endian LP64 231 return (jint*)(slot_addr + 1) - 1; 232 else 233 return (jint*) slot_addr; 234 } 235 static jlong long_in_slot(intptr_t* slot_addr) { 236 if (sizeof(intptr_t) >= sizeof(jlong)) { 237 return *(jlong*) slot_addr; 238 } else if (!TaggedStackInterpreter) { 239 return Bytes::get_native_u8((address)slot_addr); 240 } else { 241 assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32"); 242 // assemble the long in memory order (not arithmetic order) 243 union { jlong j; jint i[2]; } u; 244 u.i[0] = (jint) slot_addr[0*stackElementSize()]; 245 u.i[1] = (jint) slot_addr[1*stackElementSize()]; 246 return u.j; 247 } 248 } 249 static void set_long_in_slot(intptr_t* slot_addr, jlong value) { 250 if (sizeof(intptr_t) >= sizeof(jlong)) { 251 *(jlong*) slot_addr = value; 252 } else if (!TaggedStackInterpreter) { 253 Bytes::put_native_u8((address)slot_addr, value); 254 } else { 255 assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32"); 256 // assemble the long in memory order (not arithmetic order) 257 union { jlong j; jint i[2]; } u; 258 u.j = value; 259 slot_addr[0*stackElementSize()] = (intptr_t) u.i[0]; 260 slot_addr[1*stackElementSize()] = (intptr_t) u.i[1]; 261 } 262 } 263 static void get_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) { 264 switch (type) { 265 case T_BOOLEAN: value->z = *int_addr_in_slot(slot_addr); break; 266 case T_CHAR: value->c = *int_addr_in_slot(slot_addr); break; 267 case T_BYTE: value->b = *int_addr_in_slot(slot_addr); break; 268 case T_SHORT: value->s = *int_addr_in_slot(slot_addr); break; 269 case T_INT: value->i = *int_addr_in_slot(slot_addr); break; 270 case T_LONG: value->j = long_in_slot(slot_addr); break; 271 case T_FLOAT: value->f = *(jfloat*)int_addr_in_slot(slot_addr); break; 272 case T_DOUBLE: value->d = jdouble_cast(long_in_slot(slot_addr)); break; 273 case T_OBJECT: value->l = (jobject)*oop_addr_in_slot(slot_addr); break; 274 default: ShouldNotReachHere(); 275 } 276 } 277 static void set_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) { 278 switch (type) { 279 case T_BOOLEAN: *int_addr_in_slot(slot_addr) = (value->z != 0); break; 280 case T_CHAR: *int_addr_in_slot(slot_addr) = value->c; break; 281 case T_BYTE: *int_addr_in_slot(slot_addr) = value->b; break; 282 case T_SHORT: *int_addr_in_slot(slot_addr) = value->s; break; 283 case T_INT: *int_addr_in_slot(slot_addr) = value->i; break; 284 case T_LONG: set_long_in_slot(slot_addr, value->j); break; 285 case T_FLOAT: *(jfloat*)int_addr_in_slot(slot_addr) = value->f; break; 286 case T_DOUBLE: set_long_in_slot(slot_addr, jlong_cast(value->d)); break; 287 case T_OBJECT: *oop_addr_in_slot(slot_addr) = (oop) value->l; break; 288 default: ShouldNotReachHere(); 289 } 290 } 291 }; 292 293 //------------------------------------------------------------------------------------------------------------------------ 294 // The interpreter generator. 295 296 class Template; 297 class AbstractInterpreterGenerator: public StackObj { 298 protected: 299 InterpreterMacroAssembler* _masm; 300 301 // shared code sequences 302 // Converter for native abi result to tosca result 303 address generate_result_handler_for(BasicType type); 304 address generate_slow_signature_handler(); 305 306 // entry point generator 307 address generate_method_entry(AbstractInterpreter::MethodKind kind); 308 309 void bang_stack_shadow_pages(bool native_call); 310 311 void generate_all(); 312 313 public: 314 AbstractInterpreterGenerator(StubQueue* _code); 315 };