1 /*
  2  * Copyright (c) 1997, 2026, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "cds/heapShared.hpp"
 26 #include "classfile/classPrinter.hpp"
 27 #include "classfile/javaClasses.inline.hpp"
 28 #include "interpreter/bytecodeHistogram.hpp"
 29 #include "interpreter/bytecodes.hpp"
 30 #include "interpreter/bytecodeStream.hpp"
 31 #include "interpreter/bytecodeTracer.hpp"
 32 #include "interpreter/interpreter.hpp"
 33 #include "memory/resourceArea.hpp"
 34 #include "oops/constantPool.inline.hpp"
 35 #include "oops/method.hpp"
 36 #include "oops/methodData.hpp"
 37 #include "runtime/atomicAccess.hpp"
 38 #include "runtime/handles.inline.hpp"
 39 #include "runtime/mutexLocker.hpp"
 40 #include "runtime/osThread.hpp"
 41 #include "utilities/align.hpp"
 42 
 43 // Prints the current bytecode and its attributes using bytecode-specific information.
 44 
 45 class BytecodePrinter {
 46  private:
 47   // %%% This field is not GC-ed, and so can contain garbage
 48   // between critical sections.  Use only pointer-comparison
 49   // operations on the pointer, except within a critical section.
 50   // (Also, ensure that occasional false positives are benign.)
 51   Method* _current_method;
 52   bool      _is_wide;
 53   Bytecodes::Code _code;
 54   address   _next_pc;                // current decoding position
 55   int       _flags;
 56   bool      _is_linked;
 57 
 58   bool      is_linked() const        { return _is_linked; }
 59   void      align()                  { _next_pc = align_up(_next_pc, sizeof(jint)); }
 60   int       get_byte()               { return *(jbyte*) _next_pc++; }  // signed
 61   int       get_index_u1()           { return *(address)_next_pc++; }  // returns 0x00 - 0xff as an int
 62   short     get_short()              { short i = Bytes::get_Java_u2  (_next_pc); _next_pc += 2; return i; }
 63   int       get_int()                { int   i = Bytes::get_Java_u4  (_next_pc); _next_pc += 4; return i; }
 64   int       get_native_index_u2()    { int   i = Bytes::get_native_u2(_next_pc); _next_pc += 2; return i; }
 65   int       get_native_index_u4()    { int   i = Bytes::get_native_u4(_next_pc); _next_pc += 4; return i; }
 66   int       get_Java_index_u2()      { int   i = Bytes::get_Java_u2  (_next_pc); _next_pc += 2; return i; }
 67   int       get_Java_index_u4()      { int   i = Bytes::get_Java_u4  (_next_pc); _next_pc += 4; return i; }
 68   int       get_index_special()      { return (is_wide()) ? get_Java_index_u2() : get_index_u1(); }
 69   Method*   method() const           { return _current_method; }
 70   bool      is_wide() const          { return _is_wide; }
 71   Bytecodes::Code raw_code() const   { return Bytecodes::Code(_code); }
 72   ConstantPool* constants() const    { return method()->constants(); }
 73   ConstantPoolCache* cpcache() const { assert(is_linked(), "must be"); return constants()->cache(); }
 74 
 75   void      print_constant(int i, outputStream* st);
 76   void      print_cpcache_entry(int cpc_index, outputStream* st);
 77   void      print_invokedynamic(int indy_index, int cp_index, outputStream* st);
 78   void      print_bsm(int cp_index, outputStream* st);
 79   void      print_field_or_method(int cp_index, outputStream* st);
 80   void      print_dynamic(int cp_index, outputStream* st);
 81   void      print_attributes(int bci, outputStream* st);
 82   void      bytecode_epilog(int bci, outputStream* st);
 83 
 84  public:
 85   BytecodePrinter(int flags = 0) : _is_wide(false), _code(Bytecodes::_illegal), _flags(flags) {}
 86 
 87 #ifndef PRODUCT
 88   BytecodePrinter(Method* prev_method) : BytecodePrinter(0) {
 89     _current_method = prev_method;
 90   }
 91 
 92   // This method is called while executing the raw bytecodes, so none of
 93   // the adjustments that BytecodeStream performs applies.
 94   void trace(const methodHandle& method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st) {
 95     ResourceMark rm;
 96     bool method_changed = _current_method != method();
 97     _current_method = method();
 98     _is_linked = method->method_holder()->is_linked();
 99     assert(_is_linked, "this function must be called on methods that are already executing");
100 
101     if (method_changed) {
102       // Note 1: This code will not work as expected with true MT/MP.
103       //         Need an explicit lock or a different solution.
104       // It is possible for this block to be skipped, if a garbage
105       // _current_method pointer happens to have the same bits as
106       // the incoming method.  We could lose a line of trace output.
107       // This is acceptable in a debug-only feature.
108       st->cr();
109       st->print("[%zu] ", Thread::current()->osthread()->thread_id_for_printing());
110       method->print_name(st);
111       st->cr();
112     }
113     Bytecodes::Code code;
114     if (is_wide()) {
115       // bcp wasn't advanced if previous bytecode was _wide.
116       code = Bytecodes::code_at(method(), bcp+1);
117     } else {
118       code = Bytecodes::code_at(method(), bcp);
119     }
120     _code = code;
121     _next_pc = is_wide() ? bcp+2 : bcp+1;
122     // Trace each bytecode unless we're truncating the tracing output, then only print the first
123     // bytecode in every method as well as returns/throws that pop control flow
124     if (!TraceBytecodesTruncated || method_changed ||
125         code == Bytecodes::_athrow ||
126         code == Bytecodes::_return_register_finalizer ||
127         (code >= Bytecodes::_ireturn && code <= Bytecodes::_return)) {
128       int bci = (int)(bcp - method->code_base());
129       st->print("[%zu] ", Thread::current()->osthread()->thread_id_for_printing());
130       if (Verbose) {
131         st->print("%8zu  %4d  " INTPTR_FORMAT " " INTPTR_FORMAT " %s",
132             BytecodeCounter::counter_value(), bci, tos, tos2, Bytecodes::name(code));
133       } else {
134         st->print("%8zu  %4d  %s",
135             BytecodeCounter::counter_value(), bci, Bytecodes::name(code));
136       }
137       print_attributes(bci, st);
138     }
139     // Set is_wide for the next one, since the caller of this doesn't skip
140     // the next bytecode.
141     _is_wide = (code == Bytecodes::_wide);
142     _code = Bytecodes::_illegal;
143 
144     if (TraceBytecodesStopAt != 0 && BytecodeCounter::counter_value() >= TraceBytecodesStopAt) {
145       TraceBytecodes = false;
146     }
147   }
148 #endif
149 
150   // Used for Method::print_codes().  The input bcp comes from
151   // BytecodeStream, which will skip wide bytecodes.
152   void trace(const methodHandle& method, address bcp, outputStream* st) {
153     _current_method = method();
154     _is_linked = method->method_holder()->is_linked();
155     ResourceMark rm;
156     Bytecodes::Code code = Bytecodes::code_at(method(), bcp);
157     // Set is_wide
158     _is_wide = (code == Bytecodes::_wide);
159     if (is_wide()) {
160       code = Bytecodes::code_at(method(), bcp+1);
161     }
162     _code = code;
163     int bci = (int)(bcp - method->code_base());
164     // Print bytecode index and name
165     if (ClassPrinter::has_mode(_flags, ClassPrinter::PRINT_BYTECODE_ADDR)) {
166       st->print(INTPTR_FORMAT " ", p2i(bcp));
167     }
168     if (is_wide()) {
169       st->print("%4d %s_w", bci, Bytecodes::name(code));
170     } else {
171       st->print("%4d %s", bci, Bytecodes::name(code));
172     }
173     _next_pc = is_wide() ? bcp+2 : bcp+1;
174     print_attributes(bci, st);
175     bytecode_epilog(bci, st);
176   }
177 };
178 
179 #ifndef PRODUCT
180 // We need a global instance to keep track of the method being printed so we can report that
181 // the method has changed. If this method is redefined and removed, that's ok because the method passed
182 // in won't match, and this will print the method passed in again. Racing threads changing this global
183 // will result in reprinting the method passed in again.
184 static Method* _method_currently_being_printed = nullptr;
185 
186 void BytecodeTracer::trace_interpreter(const methodHandle& method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st) {
187   if (TraceBytecodes && BytecodeCounter::counter_value() >= TraceBytecodesAt) {
188     BytecodePrinter printer(AtomicAccess::load_acquire(&_method_currently_being_printed));
189     stringStream buf;
190     printer.trace(method, bcp, tos, tos2, &buf);
191     st->print("%s", buf.freeze());
192     // Save method currently being printed to detect when method printing changes.
193     AtomicAccess::release_store(&_method_currently_being_printed, method());
194   }
195 }
196 #endif
197 
198 void BytecodeTracer::print_method_codes(const methodHandle& method, int from, int to, outputStream* st, int flags, bool buffered) {
199   BytecodePrinter method_printer(flags);
200   BytecodeStream s(method);
201   s.set_interval(from, to);
202 
203   ResourceMark rm;
204   stringStream ss;
205   outputStream* out = buffered ? &ss : st;
206   while (s.next() >= 0) {
207     method_printer.trace(method, s.bcp(), out);
208   }
209   if (buffered) {
210     st->print("%s", ss.as_string());
211   }
212 }
213 
214 void BytecodePrinter::print_constant(int cp_index, outputStream* st) {
215   ConstantPool* constants = method()->constants();
216   constantTag tag = constants->tag_at(cp_index);
217 
218   if (tag.is_int()) {
219     st->print_cr(" " INT32_FORMAT, constants->int_at(cp_index));
220   } else if (tag.is_long()) {
221     st->print_cr(" " INT64_FORMAT, (int64_t)(constants->long_at(cp_index)));
222   } else if (tag.is_float()) {
223     st->print_cr(" %f", constants->float_at(cp_index));
224   } else if (tag.is_double()) {
225     st->print_cr(" %f", constants->double_at(cp_index));
226   } else if (tag.is_string()) {
227     const char* string = constants->unresolved_string_at(cp_index)->as_quoted_ascii();
228     st->print_cr(" \"%s\"", string);
229   } else if (tag.is_klass()) {
230     st->print_cr(" %s", constants->resolved_klass_at(cp_index)->external_name());
231   } else if (tag.is_unresolved_klass()) {
232     st->print_cr(" %s", constants->klass_at_noresolve(cp_index)->as_quoted_ascii());
233   } else if (tag.is_method_type()) {
234     int i2 = constants->method_type_index_at(cp_index);
235     st->print(" <MethodType> %d", i2);
236     st->print_cr(" %s", constants->symbol_at(i2)->as_quoted_ascii());
237   } else if (tag.is_method_handle()) {
238     int kind = constants->method_handle_ref_kind_at(cp_index);
239     int i2 = constants->method_handle_index_at(cp_index);
240     st->print(" <MethodHandle of kind %d index at %d>", kind, i2);
241     print_field_or_method(i2, st);
242   } else if (tag.is_dynamic_constant()) {
243     print_dynamic(cp_index, st);
244     if (ClassPrinter::has_mode(_flags, ClassPrinter::PRINT_DYNAMIC)) {
245       print_bsm(cp_index, st);
246     }
247   } else {
248     st->print_cr(" bad tag=%d at %d", tag.value(), cp_index);
249   }
250 }
251 
252 // Fieldref, Methodref, or InterfaceMethodref
253 void BytecodePrinter::print_field_or_method(int cp_index, outputStream* st) {
254   ConstantPool* constants = method()->constants();
255   constantTag tag = constants->tag_at(cp_index);
256 
257   switch (tag.value()) {
258   case JVM_CONSTANT_Fieldref:
259   case JVM_CONSTANT_Methodref:
260   case JVM_CONSTANT_InterfaceMethodref:
261     break;
262   default:
263     st->print_cr(" bad tag=%d at %d", tag.value(), cp_index);
264     return;
265   }
266 
267   Symbol* name = constants->uncached_name_ref_at(cp_index);
268   Symbol* signature = constants->uncached_signature_ref_at(cp_index);
269   Symbol* klass = constants->klass_name_at(constants->uncached_klass_ref_index_at(cp_index));
270   const char* sep = (tag.is_field() ? ":" : "");
271   st->print_cr(" %d <%s.%s%s%s> ", cp_index, klass->as_C_string(), name->as_C_string(), sep, signature->as_C_string());
272 }
273 
274 // JVM_CONSTANT_Dynamic or JVM_CONSTANT_InvokeDynamic
275 void BytecodePrinter::print_dynamic(int cp_index, outputStream* st) {
276   ConstantPool* constants = method()->constants();
277   constantTag tag = constants->tag_at(cp_index);
278 
279   switch (tag.value()) {
280   case JVM_CONSTANT_Dynamic:
281   case JVM_CONSTANT_InvokeDynamic:
282     break;
283   default:
284     st->print_cr(" bad tag=%d at %d", tag.value(), cp_index);
285     return;
286   }
287 
288   int bsm = constants->bootstrap_method_ref_index_at(cp_index);
289   st->print(" bsm=%d", bsm);
290 
291   Symbol* name = constants->uncached_name_ref_at(cp_index);
292   Symbol* signature = constants->uncached_signature_ref_at(cp_index);
293   const char* sep = tag.is_dynamic_constant() ? ":" : "";
294   st->print_cr(" %d <%s%s%s>", cp_index, name->as_C_string(), sep, signature->as_C_string());
295 }
296 
297 void BytecodePrinter::print_invokedynamic(int indy_index, int cp_index, outputStream* st) {
298   print_dynamic(cp_index, st);
299 
300   if (ClassPrinter::has_mode(_flags, ClassPrinter::PRINT_DYNAMIC)) {
301     print_bsm(cp_index, st);
302 
303     if (is_linked()) {
304       ResolvedIndyEntry* indy_entry = constants()->resolved_indy_entry_at(indy_index);
305       st->print("  ResolvedIndyEntry: ");
306       indy_entry->print_on(st);
307       if (indy_entry->has_appendix()) {
308         oop apx = constants()->resolved_reference_from_indy(indy_index);
309         st->print_cr(" - appendix = " INTPTR_FORMAT, p2i(apx));
310       }
311     }
312   }
313 }
314 
315 // cp_index: must be the cp_index of a JVM_CONSTANT_{Dynamic, DynamicInError, InvokeDynamic}
316 void BytecodePrinter::print_bsm(int cp_index, outputStream* st) {
317   assert(constants()->tag_at(cp_index).has_bootstrap(), "must be");
318   int bsm = constants()->bootstrap_method_ref_index_at(cp_index);
319   const char* ref_kind = "";
320   switch (constants()->method_handle_ref_kind_at(bsm)) {
321   case JVM_REF_getField         : ref_kind = "REF_getField"; break;
322   case JVM_REF_getStatic        : ref_kind = "REF_getStatic"; break;
323   case JVM_REF_putField         : ref_kind = "REF_putField"; break;
324   case JVM_REF_putStatic        : ref_kind = "REF_putStatic"; break;
325   case JVM_REF_invokeVirtual    : ref_kind = "REF_invokeVirtual"; break;
326   case JVM_REF_invokeStatic     : ref_kind = "REF_invokeStatic"; break;
327   case JVM_REF_invokeSpecial    : ref_kind = "REF_invokeSpecial"; break;
328   case JVM_REF_newInvokeSpecial : ref_kind = "REF_newInvokeSpecial"; break;
329   case JVM_REF_invokeInterface  : ref_kind = "REF_invokeInterface"; break;
330   default                       : ShouldNotReachHere();
331   }
332   st->print("  BSM: %s", ref_kind);
333   print_field_or_method(constants()->method_handle_index_at(bsm), st);
334   int argc = constants()->bootstrap_argument_count_at(cp_index);
335   st->print("  arguments[%d] = {", argc);
336   if (argc > 0) {
337     st->cr();
338     for (int arg_i = 0; arg_i < argc; arg_i++) {
339       int arg = constants()->bootstrap_argument_index_at(cp_index, arg_i);
340       st->print("    ");
341       print_constant(arg, st);
342     }
343   }
344   st->print_cr("  }");
345 }
346 
347 void BytecodePrinter::print_attributes(int bci, outputStream* st) {
348   // Show attributes of pre-rewritten codes
349   Bytecodes::Code code = Bytecodes::java_code(raw_code());
350   // If the code doesn't have any fields there's nothing to print.
351   // note this is ==1 because the tableswitch and lookupswitch are
352   // zero size (for some reason) and we want to print stuff out for them.
353   // Also skip this if we're truncating bytecode output
354   if (TraceBytecodesTruncated || Bytecodes::length_for(code) == 1) {
355     st->cr();
356     return;
357   }
358 
359   switch(code) {
360     // Java specific bytecodes only matter.
361     case Bytecodes::_bipush:
362       st->print_cr(" " INT32_FORMAT, get_byte());
363       break;
364     case Bytecodes::_sipush:
365       st->print_cr(" " INT32_FORMAT, get_short());
366       break;
367     case Bytecodes::_ldc:
368       {
369         int cp_index;
370         if (Bytecodes::uses_cp_cache(raw_code())) {
371           assert(is_linked(), "fast ldc bytecode must be in linked classes");
372           int obj_index = get_index_u1();
373           cp_index = constants()->object_to_cp_index(obj_index);
374         } else {
375           cp_index = get_index_u1();
376         }
377         print_constant(cp_index, st);
378       }
379       break;
380 
381     case Bytecodes::_ldc_w:
382     case Bytecodes::_ldc2_w:
383       {
384         int cp_index;
385         if (Bytecodes::uses_cp_cache(raw_code())) {
386           assert(is_linked(), "fast ldc bytecode must be in linked classes");
387           int obj_index = get_native_index_u2();
388           cp_index = constants()->object_to_cp_index(obj_index);
389         } else {
390           cp_index = get_Java_index_u2();
391         }
392         print_constant(cp_index, st);
393       }
394       break;
395 
396     case Bytecodes::_iload:
397     case Bytecodes::_lload:
398     case Bytecodes::_fload:
399     case Bytecodes::_dload:
400     case Bytecodes::_aload:
401     case Bytecodes::_istore:
402     case Bytecodes::_lstore:
403     case Bytecodes::_fstore:
404     case Bytecodes::_dstore:
405     case Bytecodes::_astore:
406       st->print_cr(" #%d", get_index_special());
407       break;
408 
409     case Bytecodes::_iinc:
410       { int index = get_index_special();
411         jint offset = is_wide() ? get_short(): get_byte();
412         st->print_cr(" #%d " INT32_FORMAT, index, offset);
413       }
414       break;
415 
416     case Bytecodes::_newarray: {
417         BasicType atype = (BasicType)get_index_u1();
418         const char* str = type2name(atype);
419         if (str == nullptr || is_reference_type(atype)) {
420           assert(false, "Unidentified basic type");
421         }
422         st->print_cr(" %s", str);
423       }
424       break;
425     case Bytecodes::_anewarray: {
426         int klass_index = get_Java_index_u2();
427         ConstantPool* constants = method()->constants();
428         Symbol* name = constants->klass_name_at(klass_index);
429         st->print_cr(" %s ", name->as_C_string());
430       }
431       break;
432     case Bytecodes::_multianewarray: {
433         int klass_index = get_Java_index_u2();
434         int nof_dims = get_index_u1();
435         ConstantPool* constants = method()->constants();
436         Symbol* name = constants->klass_name_at(klass_index);
437         st->print_cr(" %s %d", name->as_C_string(), nof_dims);
438       }
439       break;
440 
441     case Bytecodes::_ifeq:
442     case Bytecodes::_ifnull:
443     case Bytecodes::_iflt:
444     case Bytecodes::_ifle:
445     case Bytecodes::_ifne:
446     case Bytecodes::_ifnonnull:
447     case Bytecodes::_ifgt:
448     case Bytecodes::_ifge:
449     case Bytecodes::_if_icmpeq:
450     case Bytecodes::_if_icmpne:
451     case Bytecodes::_if_icmplt:
452     case Bytecodes::_if_icmpgt:
453     case Bytecodes::_if_icmple:
454     case Bytecodes::_if_icmpge:
455     case Bytecodes::_if_acmpeq:
456     case Bytecodes::_if_acmpne:
457     case Bytecodes::_goto:
458     case Bytecodes::_jsr:
459       st->print_cr(" %d", bci + get_short());
460       break;
461 
462     case Bytecodes::_goto_w:
463     case Bytecodes::_jsr_w:
464       st->print_cr(" %d", bci + get_int());
465       break;
466 
467     case Bytecodes::_ret: st->print_cr(" %d", get_index_special()); break;
468 
469     case Bytecodes::_tableswitch:
470       { align();
471         int  default_dest = bci + get_int();
472         int  lo           = get_int();
473         int  hi           = get_int();
474         int  len          = hi - lo + 1;
475         jint* dest        = NEW_RESOURCE_ARRAY(jint, len);
476         for (int i = 0; i < len; i++) {
477           dest[i] = bci + get_int();
478         }
479         st->print(" %d " INT32_FORMAT " " INT32_FORMAT " ",
480                       default_dest, lo, hi);
481         const char *comma = "";
482         for (int ll = lo; ll <= hi; ll++) {
483           int idx = ll - lo;
484           st->print("%s %d:" INT32_FORMAT " (delta: %d)", comma, ll, dest[idx], dest[idx]-bci);
485           comma = ",";
486         }
487         st->cr();
488       }
489       break;
490     case Bytecodes::_lookupswitch:
491       { align();
492         int  default_dest = bci + get_int();
493         int  len          = get_int();
494         jint* key         = NEW_RESOURCE_ARRAY(jint, len);
495         jint* dest        = NEW_RESOURCE_ARRAY(jint, len);
496         for (int i = 0; i < len; i++) {
497           key [i] = get_int();
498           dest[i] = bci + get_int();
499         };
500         st->print(" %d %d ", default_dest, len);
501         const char *comma = "";
502         for (int ll = 0; ll < len; ll++)  {
503           st->print("%s " INT32_FORMAT ":" INT32_FORMAT, comma, key[ll], dest[ll]);
504           comma = ",";
505         }
506         st->cr();
507       }
508       break;
509 
510     case Bytecodes::_putstatic:
511     case Bytecodes::_getstatic:
512     case Bytecodes::_putfield:
513     case Bytecodes::_getfield:
514       {
515         int cp_index;
516         if (is_linked()) {
517           int field_index = get_native_index_u2();
518           cp_index = cpcache()->resolved_field_entry_at(field_index)->constant_pool_index();
519         } else {
520           cp_index = get_Java_index_u2();
521         }
522         print_field_or_method(cp_index, st);
523       }
524       break;
525 
526     case Bytecodes::_invokevirtual:
527     case Bytecodes::_invokespecial:
528     case Bytecodes::_invokestatic:
529       {
530         int cp_index;
531         if (is_linked()) {
532           int method_index = get_native_index_u2();
533           ResolvedMethodEntry* method_entry = cpcache()->resolved_method_entry_at(method_index);
534           cp_index = method_entry->constant_pool_index();
535           print_field_or_method(cp_index, st);
536 
537           if (raw_code() == Bytecodes::_invokehandle &&
538               ClassPrinter::has_mode(_flags, ClassPrinter::PRINT_METHOD_HANDLE)) {
539             assert(is_linked(), "invokehandle is only in rewritten methods");
540             method_entry->print_on(st);
541             if (method_entry->has_appendix()) {
542               st->print("  appendix: ");
543               constants()->resolved_reference_from_method(method_index)->print_on(st);
544             }
545           }
546         } else {
547           cp_index = get_Java_index_u2();
548           print_field_or_method(cp_index, st);
549         }
550       }
551       break;
552 
553     case Bytecodes::_invokeinterface:
554       {
555         int cp_index;
556         if (is_linked()) {
557           int method_index = get_native_index_u2();
558           cp_index = cpcache()->resolved_method_entry_at(method_index)->constant_pool_index();
559         } else {
560           cp_index = get_Java_index_u2();
561         }
562         int count = get_index_u1(); // TODO: this is not printed.
563         get_byte();                 // ignore zero byte
564         print_field_or_method(cp_index, st);
565       }
566       break;
567 
568     case Bytecodes::_invokedynamic:
569       {
570         int indy_index;
571         int cp_index;
572         if (is_linked()) {
573           indy_index = get_native_index_u4();
574           cp_index = constants()->resolved_indy_entry_at(indy_index)->constant_pool_index();
575         } else {
576           indy_index = -1;
577           cp_index = get_Java_index_u2();
578           get_byte();            // ignore zero byte
579           get_byte();            // ignore zero byte
580         }
581         print_invokedynamic(indy_index, cp_index, st);
582       }
583       break;
584 
585     case Bytecodes::_new:
586     case Bytecodes::_checkcast:
587     case Bytecodes::_instanceof:
588       { int i = get_Java_index_u2();
589         ConstantPool* constants = method()->constants();
590         Symbol* name = constants->klass_name_at(i);
591         st->print_cr(" %d <%s>", i, name->as_C_string());
592       }
593       break;
594 
595     case Bytecodes::_wide:
596       // length is zero not one, but printed with no more info.
597       break;
598 
599     default:
600       ShouldNotReachHere();
601       break;
602   }
603 }
604 
605 
606 void BytecodePrinter::bytecode_epilog(int bci, outputStream* st) {
607   MethodData* mdo = method()->method_data();
608   if (mdo != nullptr) {
609 
610     // Lock to read ProfileData, and ensure lock is not broken by a safepoint
611     MutexLocker ml(mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
612 
613     ProfileData* data = mdo->bci_to_data(bci);
614     if (data != nullptr) {
615       st->print("  %d ", mdo->dp_to_di(data->dp()));
616       st->fill_to(7);
617       data->print_data_on(st, mdo);
618     }
619   }
620 }
--- EOF ---