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 // Base class for different kinds of abstractions working 26 // relative to an objects 'this' pointer. 27 28 class ThisRelativeObj VALUE_OBJ_CLASS_SPEC { 29 private: 30 int sign_extend (int x, int size) const { const int s = (BytesPerInt - size)*BitsPerByte; return (x << s) >> s; } 31 32 public: 33 // Address computation 34 address addr_at (int offset) const { return (address)this + offset; } 35 address aligned_addr_at (int offset) const { return (address)round_to((intptr_t)addr_at(offset), jintSize); } 36 int aligned_offset (int offset) const { return aligned_addr_at(offset) - addr_at(0); } 37 38 // Java unsigned accessors (using Java spec byte ordering) 39 int java_byte_at (int offset) const { return *(jubyte*)addr_at(offset); } 40 int java_hwrd_at (int offset) const { return java_byte_at(offset) << (1 * BitsPerByte) | java_byte_at(offset + 1); } 41 int java_word_at (int offset) const { return java_hwrd_at(offset) << (2 * BitsPerByte) | java_hwrd_at(offset + 2); } 42 43 // Java signed accessors (using Java spec byte ordering) 44 int java_signed_byte_at(int offset) const { return sign_extend(java_byte_at(offset), 1); } 45 int java_signed_hwrd_at(int offset) const { return sign_extend(java_hwrd_at(offset), 2); } 46 int java_signed_word_at(int offset) const { return java_word_at(offset) ; } 47 48 // Fast accessors (using the machine's natural byte ordering) 49 int fast_byte_at (int offset) const { return *(jubyte *)addr_at(offset); } 50 int fast_hwrd_at (int offset) const { return *(jushort*)addr_at(offset); } 51 int fast_word_at (int offset) const { return *(juint *)addr_at(offset); } 52 53 // Fast signed accessors (using the machine's natural byte ordering) 54 int fast_signed_byte_at(int offset) const { return *(jbyte *)addr_at(offset); } 55 int fast_signed_hwrd_at(int offset) const { return *(jshort*)addr_at(offset); } 56 int fast_signed_word_at(int offset) const { return *(jint *)addr_at(offset); } 57 58 // Fast manipulators (using the machine's natural byte ordering) 59 void set_fast_byte_at (int offset, int x) const { *(jbyte *)addr_at(offset) = (jbyte )x; } 60 void set_fast_hwrd_at (int offset, int x) const { *(jshort*)addr_at(offset) = (jshort)x; } 61 void set_fast_word_at (int offset, int x) const { *(jint *)addr_at(offset) = (jint )x; } 62 }; 63 64 65 // The base class for different kinds of bytecode abstractions. 66 // Provides the primitive operations to manipulate code relative 67 // to an objects 'this' pointer. 68 69 class Bytecode: public ThisRelativeObj { 70 protected: 71 u_char byte_at(int offset) const { return *addr_at(offset); } 72 bool check_must_rewrite() const; 73 74 public: 75 // Attributes 76 address bcp() const { return addr_at(0); } 77 address next_bcp() const { return addr_at(0) + Bytecodes::length_at(bcp()); } 78 int instruction_size() const { return Bytecodes::length_at(bcp()); } 79 80 Bytecodes::Code code() const { return Bytecodes::code_at(addr_at(0)); } 81 Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); } 82 bool must_rewrite() const { return Bytecodes::can_rewrite(code()) && check_must_rewrite(); } 83 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); } 84 85 int one_byte_index() const { assert_index_size(1); return byte_at(1); } 86 int two_byte_index() const { assert_index_size(2); return (byte_at(1) << 8) + byte_at(2); } 87 88 int offset() const { return (two_byte_index() << 16) >> 16; } 89 address destination() const { return bcp() + offset(); } 90 91 // Attribute modification 92 void set_code(Bytecodes::Code code); 93 94 // Creation 95 inline friend Bytecode* Bytecode_at(address bcp); 96 97 private: 98 void assert_index_size(int required_size) const { 99 #ifdef ASSERT 100 int isize = instruction_size() - 1; 101 if (isize == 2 && code() == Bytecodes::_iinc) 102 isize = 1; 103 else if (isize <= 2) 104 ; // no change 105 else if (code() == Bytecodes::_invokedynamic) 106 isize = 4; 107 else 108 isize = 2; 109 assert(isize = required_size, "wrong index size"); 110 #endif 111 } 112 }; 113 114 inline Bytecode* Bytecode_at(address bcp) { 115 return (Bytecode*)bcp; 116 } 117 118 119 // Abstractions for lookupswitch bytecode 120 121 class LookupswitchPair: ThisRelativeObj { 122 private: 123 int _match; 124 int _offset; 125 126 public: 127 int match() const { return java_signed_word_at(0 * jintSize); } 128 int offset() const { return java_signed_word_at(1 * jintSize); } 129 }; 130 131 132 class Bytecode_lookupswitch: public Bytecode { 133 public: 134 void verify() const PRODUCT_RETURN; 135 136 // Attributes 137 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); } 138 int number_of_pairs() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); } 139 LookupswitchPair* pair_at(int i) const { assert(0 <= i && i < number_of_pairs(), "pair index out of bounds"); 140 return (LookupswitchPair*)aligned_addr_at(1 + (1 + i)*2*jintSize); } 141 // Creation 142 inline friend Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp); 143 }; 144 145 inline Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp) { 146 Bytecode_lookupswitch* b = (Bytecode_lookupswitch*)bcp; 147 debug_only(b->verify()); 148 return b; 149 } 150 151 152 class Bytecode_tableswitch: public Bytecode { 153 public: 154 void verify() const PRODUCT_RETURN; 155 156 // Attributes 157 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); } 158 int low_key() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); } 159 int high_key() const { return java_signed_word_at(aligned_offset(1 + 2*jintSize)); } 160 int dest_offset_at(int i) const; 161 int length() { return high_key()-low_key()+1; } 162 163 // Creation 164 inline friend Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp); 165 }; 166 167 inline Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp) { 168 Bytecode_tableswitch* b = (Bytecode_tableswitch*)bcp; 169 debug_only(b->verify()); 170 return b; 171 } 172 173 174 // Abstraction for invoke_{virtual, static, interface, special} 175 176 class Bytecode_invoke: public ResourceObj { 177 protected: 178 methodHandle _method; // method containing the bytecode 179 int _bci; // position of the bytecode 180 181 Bytecode_invoke(methodHandle method, int bci) : _method(method), _bci(bci) {} 182 183 public: 184 void verify() const; 185 186 // Attributes 187 methodHandle method() const { return _method; } 188 int bci() const { return _bci; } 189 address bcp() const { return _method->bcp_from(bci()); } 190 191 int index() const; // the constant pool index for the invoke 192 symbolOop name() const; // returns the name of the invoked method 193 symbolOop signature() const; // returns the signature of the invoked method 194 BasicType result_type(Thread *thread) const; // returns the result type of the invoke 195 196 Bytecodes::Code code() const { return Bytecodes::code_at(bcp(), _method()); } 197 Bytecodes::Code adjusted_invoke_code() const { return Bytecodes::java_code(code()); } 198 199 methodHandle static_target(TRAPS); // "specified" method (from constant pool) 200 201 // Testers 202 bool is_invokeinterface() const { return adjusted_invoke_code() == Bytecodes::_invokeinterface; } 203 bool is_invokevirtual() const { return adjusted_invoke_code() == Bytecodes::_invokevirtual; } 204 bool is_invokestatic() const { return adjusted_invoke_code() == Bytecodes::_invokestatic; } 205 bool is_invokespecial() const { return adjusted_invoke_code() == Bytecodes::_invokespecial; } 206 bool is_invokedynamic() const { return adjusted_invoke_code() == Bytecodes::_invokedynamic; } 207 208 bool has_giant_index() const { return is_invokedynamic(); } 209 210 bool is_valid() const { return is_invokeinterface() || 211 is_invokevirtual() || 212 is_invokestatic() || 213 is_invokespecial(); } 214 215 // Creation 216 inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci); 217 218 // Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke. 219 inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci); 220 }; 221 222 inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) { 223 Bytecode_invoke* b = new Bytecode_invoke(method, bci); 224 debug_only(b->verify()); 225 return b; 226 } 227 228 inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) { 229 Bytecode_invoke* b = new Bytecode_invoke(method, bci); 230 return b->is_valid() ? b : NULL; 231 } 232 233 234 // Abstraction for all field accesses (put/get field/static_ 235 class Bytecode_field: public Bytecode { 236 public: 237 void verify() const; 238 239 int index() const; 240 bool is_static() const; 241 242 // Creation 243 inline friend Bytecode_field* Bytecode_field_at(const methodOop method, address bcp); 244 }; 245 246 inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) { 247 Bytecode_field* b = (Bytecode_field*)bcp; 248 debug_only(b->verify()); 249 return b; 250 } 251 252 253 // Abstraction for {get,put}static 254 255 class Bytecode_static: public Bytecode { 256 public: 257 void verify() const; 258 259 // Returns the result type of the send by inspecting the field ref 260 BasicType result_type(methodOop method) const; 261 262 // Creation 263 inline friend Bytecode_static* Bytecode_static_at(const methodOop method, address bcp); 264 }; 265 266 inline Bytecode_static* Bytecode_static_at(const methodOop method, address bcp) { 267 Bytecode_static* b = (Bytecode_static*)bcp; 268 debug_only(b->verify()); 269 return b; 270 } 271 272 273 // Abstraction for checkcast 274 275 class Bytecode_checkcast: public Bytecode { 276 public: 277 void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); } 278 279 // Returns index 280 long index() const { return java_hwrd_at(1); }; 281 282 // Creation 283 inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp); 284 }; 285 286 inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) { 287 Bytecode_checkcast* b = (Bytecode_checkcast*)bcp; 288 debug_only(b->verify()); 289 return b; 290 } 291 292 293 // Abstraction for instanceof 294 295 class Bytecode_instanceof: public Bytecode { 296 public: 297 void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); } 298 299 // Returns index 300 long index() const { return java_hwrd_at(1); }; 301 302 // Creation 303 inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp); 304 }; 305 306 inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) { 307 Bytecode_instanceof* b = (Bytecode_instanceof*)bcp; 308 debug_only(b->verify()); 309 return b; 310 } 311 312 313 class Bytecode_new: public Bytecode { 314 public: 315 void verify() const { assert(java_code() == Bytecodes::_new, "check new"); } 316 317 // Returns index 318 long index() const { return java_hwrd_at(1); }; 319 320 // Creation 321 inline friend Bytecode_new* Bytecode_new_at(address bcp); 322 }; 323 324 inline Bytecode_new* Bytecode_new_at(address bcp) { 325 Bytecode_new* b = (Bytecode_new*)bcp; 326 debug_only(b->verify()); 327 return b; 328 } 329 330 331 class Bytecode_multianewarray: public Bytecode { 332 public: 333 void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); } 334 335 // Returns index 336 long index() const { return java_hwrd_at(1); }; 337 338 // Creation 339 inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp); 340 }; 341 342 inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) { 343 Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp; 344 debug_only(b->verify()); 345 return b; 346 } 347 348 349 class Bytecode_anewarray: public Bytecode { 350 public: 351 void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); } 352 353 // Returns index 354 long index() const { return java_hwrd_at(1); }; 355 356 // Creation 357 inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp); 358 }; 359 360 inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) { 361 Bytecode_anewarray* b = (Bytecode_anewarray*)bcp; 362 debug_only(b->verify()); 363 return b; 364 } 365 366 367 // Abstraction for ldc, ldc_w and ldc2_w 368 369 class Bytecode_loadconstant: public Bytecode { 370 public: 371 void verify() const { 372 Bytecodes::Code stdc = Bytecodes::java_code(code()); 373 assert(stdc == Bytecodes::_ldc || 374 stdc == Bytecodes::_ldc_w || 375 stdc == Bytecodes::_ldc2_w, "load constant"); 376 } 377 378 int index() const; 379 380 inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp); 381 }; 382 383 inline Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp) { 384 Bytecode_loadconstant* b = (Bytecode_loadconstant*)bcp; 385 debug_only(b->verify()); 386 return b; 387 }