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comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/Bytecodes.java @ 3838:6a991dcb52bb

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7012081: JSR 292: SA-JDI can't read MH/MT/Indy ConstantPool entries Reviewed-by: kvn, twisti, jrose
author never
date Thu, 21 Jul 2011 08:38:25 -0700
parents 0a8e0d4345b3
children da91efe96a93
comparison
equal deleted inserted replaced
3837:43f9d800f276 3838:6a991dcb52bb
274 public static final int _return_register_finalizer = 231; 274 public static final int _return_register_finalizer = 231;
275 public static final int _shouldnotreachhere = 232; // For debugging 275 public static final int _shouldnotreachhere = 232; // For debugging
276 276
277 public static final int number_of_codes = 233; 277 public static final int number_of_codes = 233;
278 278
279 // Flag bits derived from format strings, can_trap, can_rewrite, etc.:
280 // semantic flags:
281 static final int _bc_can_trap = 1<<0; // bytecode execution can trap or block
282 static final int _bc_can_rewrite = 1<<1; // bytecode execution has an alternate form
283
284 // format bits (determined only by the format string):
285 static final int _fmt_has_c = 1<<2; // constant, such as sipush "bcc"
286 static final int _fmt_has_j = 1<<3; // constant pool cache index, such as getfield "bjj"
287 static final int _fmt_has_k = 1<<4; // constant pool index, such as ldc "bk"
288 static final int _fmt_has_i = 1<<5; // local index, such as iload
289 static final int _fmt_has_o = 1<<6; // offset, such as ifeq
290 static final int _fmt_has_nbo = 1<<7; // contains native-order field(s)
291 static final int _fmt_has_u2 = 1<<8; // contains double-byte field(s)
292 static final int _fmt_has_u4 = 1<<9; // contains quad-byte field
293 static final int _fmt_not_variable = 1<<10; // not of variable length (simple or wide)
294 static final int _fmt_not_simple = 1<<11; // either wide or variable length
295 static final int _all_fmt_bits = (_fmt_not_simple*2 - _fmt_has_c);
296
297 // Example derived format syndromes:
298 static final int _fmt_b = _fmt_not_variable;
299 static final int _fmt_bc = _fmt_b | _fmt_has_c;
300 static final int _fmt_bi = _fmt_b | _fmt_has_i;
301 static final int _fmt_bkk = _fmt_b | _fmt_has_k | _fmt_has_u2;
302 static final int _fmt_bJJ = _fmt_b | _fmt_has_j | _fmt_has_u2 | _fmt_has_nbo;
303 static final int _fmt_bo2 = _fmt_b | _fmt_has_o | _fmt_has_u2;
304 static final int _fmt_bo4 = _fmt_b | _fmt_has_o | _fmt_has_u4;
305
306
279 public static int specialLengthAt(Method method, int bci) { 307 public static int specialLengthAt(Method method, int bci) {
280 int code = codeAt(method, bci); 308 int code = codeAt(method, bci);
281 switch (code) { 309 switch (code) {
282 case _wide: 310 case _wide:
283 return wideLengthFor(method.getBytecodeOrBPAt(bci + 1)); 311 return wideLengthFor(method.getBytecodeOrBPAt(bci + 1));
335 // find a bytecode, behind a breakpoint if necessary: 363 // find a bytecode, behind a breakpoint if necessary:
336 // FIXME: not yet implementable 364 // FIXME: not yet implementable
337 // static Code non_breakpoint_code_at(address bcp, methodOop method = null); 365 // static Code non_breakpoint_code_at(address bcp, methodOop method = null);
338 366
339 // Bytecode attributes 367 // Bytecode attributes
340 public static boolean isDefined (int code) { return 0 <= code && code < number_of_codes && _format[code] != null; } 368 public static boolean isDefined (int code) { return 0 <= code && code < number_of_codes && flags(code, false) != 0; }
341 public static boolean wideIsDefined(int code) { return isDefined(code) && _wide_format[code] != null; } 369 public static boolean wideIsDefined(int code) { return isDefined(code) && flags(code, true) != 0; }
342 public static String name (int code) { check(code); return _name [code]; } 370 public static String name (int code) { check(code); return _name [code]; }
343 public static String format (int code) { check(code); return _format [code]; } 371 public static String format (int code) { check(code); return _format [code]; }
344 public static String wideFormat (int code) { wideCheck(code); return _wide_format [code]; } 372 public static String wideFormat (int code) { wideCheck(code); return _wide_format [code]; }
345 public static int resultType (int code) { check(code); return _result_type [code]; } 373 public static int resultType (int code) { check(code); return _result_type [code]; }
346 public static int depth (int code) { check(code); return _depth [code]; } 374 public static int depth (int code) { check(code); return _depth [code]; }
347 public static int lengthFor (int code) { check(code); return _length [code]; } 375 public static int lengthFor (int code) { check(code); return _lengths [code] & 0xF; }
348 public static boolean canTrap (int code) { check(code); return _can_trap [code]; } 376 public static int wideLengthFor(int code) { check(code); return _lengths [code] >> 4; }
377 public static boolean canTrap (int code) { check(code); return has_all_flags(code, _bc_can_trap, false); }
349 public static int javaCode (int code) { check(code); return _java_code [code]; } 378 public static int javaCode (int code) { check(code); return _java_code [code]; }
350 public static boolean canRewrite (int code) { check(code); return _can_rewrite [code]; } 379 public static boolean canRewrite (int code) { check(code); return has_all_flags(code, _bc_can_rewrite, false); }
351 public static int wideLengthFor(int code) { wideCheck(code); return wideFormat(code).length(); } 380 public static boolean native_byte_order(int code) { check(code); return has_all_flags(code, _fmt_has_nbo, false); }
381 public static boolean uses_cp_cache (int code) { check(code); return has_all_flags(code, _fmt_has_j, false); }
352 public static int lengthAt (Method method, int bci) { int l = lengthFor(codeAt(method, bci)); return l > 0 ? l : specialLengthAt(method, bci); } 382 public static int lengthAt (Method method, int bci) { int l = lengthFor(codeAt(method, bci)); return l > 0 ? l : specialLengthAt(method, bci); }
353 public static int javaLengthAt (Method method, int bci) { int l = lengthFor(javaCode(codeAt(method, bci))); return l > 0 ? l : specialLengthAt(method, bci); } 383 public static int javaLengthAt (Method method, int bci) { int l = lengthFor(javaCode(codeAt(method, bci))); return l > 0 ? l : specialLengthAt(method, bci); }
354 public static boolean isJavaCode (int code) { return 0 <= code && code < number_of_java_codes; } 384 public static boolean isJavaCode (int code) { return 0 <= code && code < number_of_java_codes; }
355 public static boolean isFastCode (int code) { return number_of_java_codes <= code && code < number_of_codes; } 385 public static boolean isFastCode (int code) { return number_of_java_codes <= code && code < number_of_codes; }
356 386
359 public static boolean isAstore (int code) { return (code == _astore || code == _astore_0 || code == _astore_1 389 public static boolean isAstore (int code) { return (code == _astore || code == _astore_0 || code == _astore_1
360 || code == _astore_2 || code == _astore_3); } 390 || code == _astore_2 || code == _astore_3); }
361 391
362 public static boolean isZeroConst (int code) { return (code == _aconst_null || code == _iconst_0 392 public static boolean isZeroConst (int code) { return (code == _aconst_null || code == _iconst_0
363 || code == _fconst_0 || code == _dconst_0); } 393 || code == _fconst_0 || code == _dconst_0); }
394
395 static int flags (int code, boolean is_wide) {
396 assert code == (code & 0xff) : "must be a byte";
397 return _flags[code + (is_wide ? 256 : 0)];
398 }
399 static int format_bits (int code, boolean is_wide) { return flags(code, is_wide) & _all_fmt_bits; }
400 static boolean has_all_flags (int code, int test_flags, boolean is_wide) {
401 return (flags(code, is_wide) & test_flags) == test_flags;
402 }
403
404 static char compute_flags(String format) {
405 return compute_flags(format, 0);
406 }
407 static char compute_flags(String format, int more_flags) {
408 if (format == null) return 0; // not even more_flags
409 int flags = more_flags;
410 int fp = 0;
411 if (format.length() == 0) {
412 flags |= _fmt_not_simple; // but variable
413 } else {
414 switch (format.charAt(fp)) {
415 case 'b':
416 flags |= _fmt_not_variable; // but simple
417 ++fp; // skip 'b'
418 break;
419 case 'w':
420 flags |= _fmt_not_variable | _fmt_not_simple;
421 ++fp; // skip 'w'
422 assert(format.charAt(fp) == 'b') : "wide format must start with 'wb'";
423 ++fp; // skip 'b'
424 break;
425 }
426 }
427
428 boolean has_nbo = false, has_jbo = false;
429 int has_size = 0;
430 while (fp < format.length()) {
431 int this_flag = 0;
432 char fc = format.charAt(fp++);
433 switch (fc) {
434 case '_': continue; // ignore these
435
436 case 'j': this_flag = _fmt_has_j; has_jbo = true; break;
437 case 'k': this_flag = _fmt_has_k; has_jbo = true; break;
438 case 'i': this_flag = _fmt_has_i; has_jbo = true; break;
439 case 'c': this_flag = _fmt_has_c; has_jbo = true; break;
440 case 'o': this_flag = _fmt_has_o; has_jbo = true; break;
441
442 // uppercase versions mark native byte order (from Rewriter)
443 // actually, only the 'J' case happens currently
444 case 'J': this_flag = _fmt_has_j; has_nbo = true; break;
445 case 'K': this_flag = _fmt_has_k; has_nbo = true; break;
446 case 'I': this_flag = _fmt_has_i; has_nbo = true; break;
447 case 'C': this_flag = _fmt_has_c; has_nbo = true; break;
448 case 'O': this_flag = _fmt_has_o; has_nbo = true; break;
449 default: assert false : "bad char in format";
450 }
451
452 flags |= this_flag;
453
454 assert !(has_jbo && has_nbo) : "mixed byte orders in format";
455 if (has_nbo)
456 flags |= _fmt_has_nbo;
457
458 int this_size = 1;
459 if (fp < format.length() && format.charAt(fp) == fc) {
460 // advance beyond run of the same characters
461 this_size = 2;
462 while (fp + 1 < format.length() && format.charAt(++fp) == fc) this_size++;
463 switch (this_size) {
464 case 2: flags |= _fmt_has_u2; break;
465 case 4: flags |= _fmt_has_u4; break;
466 default: assert false : "bad rep count in format";
467 }
468 }
469 assert has_size == 0 || // no field yet
470 this_size == has_size || // same size
471 this_size < has_size && fp == format.length() : // last field can be short
472 "mixed field sizes in format";
473 has_size = this_size;
474 }
475
476 assert flags == (char)flags : "change _format_flags";
477 return (char)flags;
478 }
479
364 480
365 //---------------------------------------------------------------------- 481 //----------------------------------------------------------------------
366 // Internals only below this point 482 // Internals only below this point
367 // 483 //
368 484
369 private static String[] _name; 485 private static String[] _name;
370 private static String[] _format; 486 private static String[] _format;
371 private static String[] _wide_format; 487 private static String[] _wide_format;
372 private static int[] _result_type; 488 private static int[] _result_type;
373 private static byte[] _depth; 489 private static byte[] _depth;
374 private static byte[] _length; 490 private static byte[] _lengths;
375 private static boolean[] _can_trap;
376 private static int[] _java_code; 491 private static int[] _java_code;
377 private static boolean[] _can_rewrite; 492 private static char[] _flags;
378 493
379 static { 494 static {
380 _name = new String [number_of_codes]; 495 _name = new String [number_of_codes];
381 _format = new String [number_of_codes]; 496 _format = new String [number_of_codes];
382 _wide_format = new String [number_of_codes]; 497 _wide_format = new String [number_of_codes];
383 _result_type = new int [number_of_codes]; // See BasicType.java 498 _result_type = new int [number_of_codes]; // See BasicType.java
384 _depth = new byte [number_of_codes]; 499 _depth = new byte [number_of_codes];
385 _length = new byte [number_of_codes]; 500 _lengths = new byte [number_of_codes];
386 _can_trap = new boolean[number_of_codes];
387 _java_code = new int [number_of_codes]; 501 _java_code = new int [number_of_codes];
388 _can_rewrite = new boolean[number_of_codes]; 502 _flags = new char[256 * 2]; // all second page for wide formats
389 503
390 // In case we want to fetch this information from the VM in the 504 // In case we want to fetch this information from the VM in the
391 // future 505 // future
392 VM.registerVMInitializedObserver(new Observer() { 506 VM.registerVMInitializedObserver(new Observer() {
393 public void update(Observable o, Object data) { 507 public void update(Observable o, Object data) {
710 824
711 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap, int java_code) { 825 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap, int java_code) {
712 if (Assert.ASSERTS_ENABLED) { 826 if (Assert.ASSERTS_ENABLED) {
713 Assert.that(wide_format == null || format != null, "short form must exist if there's a wide form"); 827 Assert.that(wide_format == null || format != null, "short form must exist if there's a wide form");
714 } 828 }
829 int len = (format != null ? format.length() : 0);
830 int wlen = (wide_format != null ? wide_format.length() : 0);
715 _name [code] = name; 831 _name [code] = name;
832 _result_type [code] = result_type;
833 _depth [code] = (byte) depth;
834 _lengths [code] = (byte)((wlen << 4) | (len & 0xF));
835 _java_code [code] = java_code;
716 _format [code] = format; 836 _format [code] = format;
717 _wide_format [code] = wide_format; 837 _wide_format [code] = wide_format;
718 _result_type [code] = result_type; 838 int bc_flags = 0;
719 _depth [code] = (byte) depth; 839 if (can_trap) bc_flags |= _bc_can_trap;
720 _can_trap [code] = can_trap; 840 if (java_code != code) bc_flags |= _bc_can_rewrite;
721 _length [code] = (byte) (format != null ? format.length() : 0); 841 _flags[code+0*256] = compute_flags(format, bc_flags);
722 _java_code [code] = java_code; 842 _flags[code+1*256] = compute_flags(wide_format, bc_flags);
723 if (java_code != code) {
724 _can_rewrite[java_code] = true;
725 } else {
726 _can_rewrite[java_code] = false;
727 }
728 } 843 }
729 } 844 }