Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "interpreter/bytecodeHistogram.hpp"

 #include "interpreter/bytecodeTracer.hpp"

 #include "interpreter/bytecodes.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "memory/resourceArea.hpp"

 #include "oops/methodDataOop.hpp"

 #include "oops/methodOop.hpp"

 #include "runtime/mutexLocker.hpp"

 #include "runtime/timer.hpp"

 #ifndef PRODUCT

 // Standard closure for BytecodeTracer: prints the current bytecode

 // and its attributes using bytecode-specific information.

 class BytecodePrinter: public BytecodeClosure {

  private:

   // %%% This field is not GC-ed, and so can contain garbage

   // between critical sections.  Use only pointer-comparison

   // operations on the pointer, except within a critical section.

   // (Also, ensure that occasional false positives are benign.)

   methodOop _current_method;

   bool      _is_wide;

   Bytecodes::Code _code;

   address   _next_pc;                // current decoding position

   void      align()                  { _next_pc = (address)round_to((intptr_t)_next_pc, sizeof(jint)); }

   int       get_byte()               { return *(jbyte*) _next_pc++; }  // signed

   short     get_short()              { short i=Bytes::get_Java_u2(_next_pc); _next_pc+=2; return i; }

   int       get_int()                { int i=Bytes::get_Java_u4(_next_pc); _next_pc+=4; return i; }

   int       get_index_u1()           { return *(address)_next_pc++; }

   int       get_index_u2()           { int i=Bytes::get_Java_u2(_next_pc); _next_pc+=2; return i; }

   int       get_index_u1_cpcache()   { return get_index_u1() + constantPoolOopDesc::CPCACHE_INDEX_TAG; }

   int       get_index_u2_cpcache()   { int i=Bytes::get_native_u2(_next_pc); _next_pc+=2; return i + constantPoolOopDesc::CPCACHE_INDEX_TAG; }

   int       get_index_u4()           { int i=Bytes::get_native_u4(_next_pc); _next_pc+=4; return i; }

   int       get_index_special()      { return (is_wide()) ? get_index_u2() : get_index_u1(); }

   methodOop method()                 { return _current_method; }

   bool      is_wide()                { return _is_wide; }

   Bytecodes::Code raw_code()         { return Bytecodes::Code(_code); }

   bool      check_index(int i, int& cp_index, outputStream* st = tty);

   void      print_constant(int i, outputStream* st = tty);

   void      print_field_or_method(int i, outputStream* st = tty);

   void      print_field_or_method(int orig_i, int i, outputStream* st = tty);

   void      print_attributes(int bci, outputStream* st = tty);

   void      bytecode_epilog(int bci, outputStream* st = tty);

  public:

   BytecodePrinter() {

     _is_wide = false;

     _code = Bytecodes::_illegal;

   }

   // This method is called while executing the raw bytecodes, so none of

   // the adjustments that BytecodeStream performs applies.

   void trace(methodHandle method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st) {

     ResourceMark rm;

     if (_current_method != method()) {

       // Note 1: This code will not work as expected with true MT/MP.

       //         Need an explicit lock or a different solution.

       // It is possible for this block to be skipped, if a garbage

       // _current_method pointer happens to have the same bits as

       // the incoming method.  We could lose a line of trace output.

       // This is acceptable in a debug-only feature.

       st->cr();

       st->print("[%d] ", (int) Thread::current()->osthread()->thread_id());

       method->print_name(st);

       st->cr();

       _current_method = method();

     }

     Bytecodes::Code code;

     if (is_wide()) {

       // bcp wasn't advanced if previous bytecode was _wide.

       code = Bytecodes::code_at(method(), bcp+1);

     } else {

       code = Bytecodes::code_at(method(), bcp);

     }

     _code = code;

      int bci = bcp - method->code_base();

     st->print("[%d] ", (int) Thread::current()->osthread()->thread_id());

     if (Verbose) {

       st->print("%8d  %4d  " INTPTR_FORMAT " " INTPTR_FORMAT " %s",

            BytecodeCounter::counter_value(), bci, tos, tos2, Bytecodes::name(code));

     } else {

       st->print("%8d  %4d  %s",

            BytecodeCounter::counter_value(), bci, Bytecodes::name(code));

     }

     _next_pc = is_wide() ? bcp+2 : bcp+1;

     print_attributes(bci);

     // Set is_wide for the next one, since the caller of this doesn't skip

     // the next bytecode.

     _is_wide = (code == Bytecodes::_wide);

     _code = Bytecodes::_illegal;

   }

   // Used for methodOop::print_codes().  The input bcp comes from

   // BytecodeStream, which will skip wide bytecodes.

   void trace(methodHandle method, address bcp, outputStream* st) {

     _current_method = method();

     ResourceMark rm;

     Bytecodes::Code code = Bytecodes::code_at(method(), bcp);

     // Set is_wide

     _is_wide = (code == Bytecodes::_wide);

     if (is_wide()) {

       code = Bytecodes::code_at(method(), bcp+1);

     }

     _code = code;

     int bci = bcp - method->code_base();

     // Print bytecode index and name

     if (is_wide()) {

       st->print("%d %s_w", bci, Bytecodes::name(code));

     } else {

       st->print("%d %s", bci, Bytecodes::name(code));

     }

     _next_pc = is_wide() ? bcp+2 : bcp+1;

     print_attributes(bci, st);

     bytecode_epilog(bci, st);

   }

 };

 // Implementation of BytecodeTracer

 // %%% This set_closure thing seems overly general, given that

 // nobody uses it.  Also, if BytecodePrinter weren't hidden

 // then methodOop could use instances of it directly and it

 // would be easier to remove races on _current_method and bcp.

 // Since this is not product functionality, we can defer cleanup.

 BytecodeClosure* BytecodeTracer::_closure = NULL;

 static BytecodePrinter std_closure;

 BytecodeClosure* BytecodeTracer::std_closure() {

   return &::std_closure;

 }

 void BytecodeTracer::trace(methodHandle method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st) {

   if (TraceBytecodes && BytecodeCounter::counter_value() >= TraceBytecodesAt) {

     ttyLocker ttyl;  // 5065316: keep the following output coherent

     // The ttyLocker also prevents races between two threads

     // trying to use the single instance of BytecodePrinter.

     // Using the ttyLocker prevents the system from coming to

     // a safepoint within this code, which is sensitive to methodOop

     // movement.

     //

     // There used to be a leaf mutex here, but the ttyLocker will

     // work just as well, as long as the printing operations never block.

     //

     // We put the locker on the static trace method, not the

     // virtual one, because the clients of this module go through

     // the static method.

     _closure->trace(method, bcp, tos, tos2, st);

   }

 }

 void BytecodeTracer::trace(methodHandle method, address bcp, outputStream* st) {

   ttyLocker ttyl;  // 5065316: keep the following output coherent

   _closure->trace(method, bcp, st);

 }

 void print_symbol(Symbol* sym, outputStream* st) {

   char buf[40];

   int len = sym->utf8_length();

   if (len >= (int)sizeof(buf)) {

     st->print_cr(" %s...[%d]", sym->as_C_string(buf, sizeof(buf)), len);

   } else {

     st->print(" ");

     sym->print_on(st); st->cr();

   }

 }

 void print_oop(oop value, outputStream* st) {

   if (value == NULL) {

     st->print_cr(" NULL");

   } else if (java_lang_String::is_instance(value)) {

     EXCEPTION_MARK;

     Handle h_value (THREAD, value);

     Symbol* sym = java_lang_String::as_symbol(h_value, CATCH);

     print_symbol(sym, st);

     sym->decrement_refcount();

   } else {

     st->print_cr(" " PTR_FORMAT, (intptr_t) value);

   }

 }

 bool BytecodePrinter::check_index(int i, int& cp_index, outputStream* st) {

   constantPoolOop constants = method()->constants();

   int ilimit = constants->length(), climit = 0;

   Bytecodes::Code code = raw_code();

   constantPoolCacheOop cache = NULL;

   if (Bytecodes::uses_cp_cache(code)) {

     cache = constants->cache();

     if (cache != NULL) {

       //climit = cache->length();  // %%% private!

       size_t size = cache->size() * HeapWordSize;

       size -= sizeof(constantPoolCacheOopDesc);

       size /= sizeof(ConstantPoolCacheEntry);

       climit = (int) size;

     }

   }

   if (cache != NULL && constantPoolCacheOopDesc::is_secondary_index(i)) {

     i = constantPoolCacheOopDesc::decode_secondary_index(i);

     st->print(" secondary cache[%d] of", i);

     if (i >= 0 && i < climit) {

       if (!cache->entry_at(i)->is_secondary_entry()) {

         st->print_cr(" not secondary entry?", i);

         return false;

       }

       i = cache->entry_at(i)->main_entry_index();

       goto check_cache_index;

     } else {

       st->print_cr(" not in cache[*]?", i);

       return false;

     }

   }

   if (cache != NULL) {

     goto check_cache_index;

   }

  check_cp_index:

   if (i >= 0 && i < ilimit) {

     if (WizardMode)  st->print(" cp[%d]", i);

     cp_index = i;

     return true;

   }

   st->print_cr(" CP[%d] not in CP", i);

   return false;

  check_cache_index:

 #ifdef ASSERT

   {

     const int CPCACHE_INDEX_TAG = constantPoolOopDesc::CPCACHE_INDEX_TAG;

     if (i >= CPCACHE_INDEX_TAG && i < climit + CPCACHE_INDEX_TAG) {

       i -= CPCACHE_INDEX_TAG;

     } else {

       st->print_cr(" CP[%d] missing bias?", i);

       return false;

     }

   }

 #endif //ASSERT

   if (i >= 0 && i < climit) {

     if (cache->entry_at(i)->is_secondary_entry()) {

       st->print_cr(" secondary entry?");

       return false;

     }

     i = cache->entry_at(i)->constant_pool_index();

     goto check_cp_index;

   }

   st->print_cr(" not in CP[*]?", i);

   return false;

 }

 void BytecodePrinter::print_constant(int i, outputStream* st) {

   int orig_i = i;

   if (!check_index(orig_i, i, st))  return;

   constantPoolOop constants = method()->constants();

   constantTag tag = constants->tag_at(i);

   if (tag.is_int()) {

     st->print_cr(" " INT32_FORMAT, constants->int_at(i));

   } else if (tag.is_long()) {

     st->print_cr(" " INT64_FORMAT, constants->long_at(i));

   } else if (tag.is_float()) {

     st->print_cr(" %f", constants->float_at(i));

   } else if (tag.is_double()) {

     st->print_cr(" %f", constants->double_at(i));

   } else if (tag.is_string()) {

     oop string = constants->pseudo_string_at(i);

     print_oop(string, st);

   } else if (tag.is_unresolved_string()) {

     const char* string = constants->string_at_noresolve(i);

     st->print_cr(" %s", string);

   } else if (tag.is_klass()) {

     st->print_cr(" %s", constants->resolved_klass_at(i)->klass_part()->external_name());

   } else if (tag.is_unresolved_klass()) {

     st->print_cr(" <unresolved klass at %d>", i);

   } else if (tag.is_object()) {

     st->print(" <Object>");

     print_oop(constants->object_at(i), st);

   } else if (tag.is_method_type()) {

     int i2 = constants->method_type_index_at(i);

     st->print(" <MethodType> %d", i2);

     print_symbol(constants->symbol_at(i2), st);

   } else if (tag.is_method_handle()) {

     int kind = constants->method_handle_ref_kind_at(i);

     int i2 = constants->method_handle_index_at(i);

     st->print(" <MethodHandle of kind %d>", kind, i2);

     print_field_or_method(-i, i2, st);

   } else {

     st->print_cr(" bad tag=%d at %d", tag.value(), i);

   }

 }

 void BytecodePrinter::print_field_or_method(int i, outputStream* st) {

   int orig_i = i;

   if (!check_index(orig_i, i, st))  return;

   print_field_or_method(orig_i, i, st);

 }

 void BytecodePrinter::print_field_or_method(int orig_i, int i, outputStream* st) {

   constantPoolOop constants = method()->constants();

   constantTag tag = constants->tag_at(i);

   bool has_klass = true;

   switch (tag.value()) {

   case JVM_CONSTANT_InterfaceMethodref:

   case JVM_CONSTANT_Methodref:

   case JVM_CONSTANT_Fieldref:

     break;

   case JVM_CONSTANT_NameAndType:

   case JVM_CONSTANT_InvokeDynamic:

   case JVM_CONSTANT_InvokeDynamicTrans:

     has_klass = false;

     break;

   default:

     st->print_cr(" bad tag=%d at %d", tag.value(), i);

     return;

   }

   Symbol* name = constants->uncached_name_ref_at(i);

   Symbol* signature = constants->uncached_signature_ref_at(i);

   const char* sep = (tag.is_field() ? "/" : "");

   if (has_klass) {

     Symbol* klass = constants->klass_name_at(constants->uncached_klass_ref_index_at(i));

     st->print_cr(" %d <%s.%s%s%s> ", i, klass->as_C_string(), name->as_C_string(), sep, signature->as_C_string());

   } else {

     if (tag.is_invoke_dynamic()) {

       int bsm = constants->invoke_dynamic_bootstrap_method_ref_index_at(i);

       st->print(" bsm=%d", bsm);

     }

     st->print_cr(" %d <%s%s%s>", i, name->as_C_string(), sep, signature->as_C_string());

   }

 }

 void BytecodePrinter::print_attributes(int bci, outputStream* st) {

   // Show attributes of pre-rewritten codes

   Bytecodes::Code code = Bytecodes::java_code(raw_code());

   // If the code doesn't have any fields there's nothing to print.

   // note this is ==1 because the tableswitch and lookupswitch are

   // zero size (for some reason) and we want to print stuff out for them.

   if (Bytecodes::length_for(code) == 1) {

     st->cr();

     return;

   }

   switch(code) {

     // Java specific bytecodes only matter.

     case Bytecodes::_bipush:

       st->print_cr(" " INT32_FORMAT, get_byte());

       break;

     case Bytecodes::_sipush:

       st->print_cr(" " INT32_FORMAT, get_short());

       break;

     case Bytecodes::_ldc:

       if (Bytecodes::uses_cp_cache(raw_code())) {

         print_constant(get_index_u1_cpcache(), st);

       } else {

         print_constant(get_index_u1(), st);

       }

       break;

     case Bytecodes::_ldc_w:

     case Bytecodes::_ldc2_w:

       if (Bytecodes::uses_cp_cache(raw_code())) {

         print_constant(get_index_u2_cpcache(), st);

       } else {

         print_constant(get_index_u2(), st);

       }

       break;

     case Bytecodes::_iload:

     case Bytecodes::_lload:

     case Bytecodes::_fload:

     case Bytecodes::_dload:

     case Bytecodes::_aload:

     case Bytecodes::_istore:

     case Bytecodes::_lstore:

     case Bytecodes::_fstore:

     case Bytecodes::_dstore:

     case Bytecodes::_astore:

       st->print_cr(" #%d", get_index_special());

       break;

     case Bytecodes::_iinc:

       { int index = get_index_special();

         jint offset = is_wide() ? get_short(): get_byte();

         st->print_cr(" #%d " INT32_FORMAT, index, offset);

       }

       break;

     case Bytecodes::_newarray: {

         BasicType atype = (BasicType)get_index_u1();

         const char* str = type2name(atype);

         if (str == NULL || atype == T_OBJECT || atype == T_ARRAY) {

           assert(false, "Unidentified basic type");

         }

         st->print_cr(" %s", str);

       }

       break;

     case Bytecodes::_anewarray: {

         int klass_index = get_index_u2();

         constantPoolOop constants = method()->constants();

         Symbol* name = constants->klass_name_at(klass_index);

         st->print_cr(" %s ", name->as_C_string());

       }

       break;

     case Bytecodes::_multianewarray: {

         int klass_index = get_index_u2();

         int nof_dims = get_index_u1();

         constantPoolOop constants = method()->constants();

         Symbol* name = constants->klass_name_at(klass_index);

         st->print_cr(" %s %d", name->as_C_string(), nof_dims);

       }

       break;

     case Bytecodes::_ifeq:

     case Bytecodes::_ifnull:

     case Bytecodes::_iflt:

     case Bytecodes::_ifle:

     case Bytecodes::_ifne:

     case Bytecodes::_ifnonnull:

     case Bytecodes::_ifgt:

     case Bytecodes::_ifge:

     case Bytecodes::_if_icmpeq:

     case Bytecodes::_if_icmpne:

     case Bytecodes::_if_icmplt:

     case Bytecodes::_if_icmpgt:

     case Bytecodes::_if_icmple:

     case Bytecodes::_if_icmpge:

     case Bytecodes::_if_acmpeq:

     case Bytecodes::_if_acmpne:

     case Bytecodes::_goto:

     case Bytecodes::_jsr:

       st->print_cr(" %d", bci + get_short());

       break;

     case Bytecodes::_goto_w:

     case Bytecodes::_jsr_w:

       st->print_cr(" %d", bci + get_int());

       break;

     case Bytecodes::_ret: st->print_cr(" %d", get_index_special()); break;

     case Bytecodes::_tableswitch:

       { align();

         int  default_dest = bci + get_int();

         int  lo           = get_int();

         int  hi           = get_int();

         int  len          = hi - lo + 1;

         jint* dest        = NEW_RESOURCE_ARRAY(jint, len);

         for (int i = 0; i < len; i++) {

           dest[i] = bci + get_int();

         }

         st->print(" %d " INT32_FORMAT " " INT32_FORMAT " ",

                       default_dest, lo, hi);

         int first = true;

         for (int ll = lo; ll <= hi; ll++, first = false)  {

           int idx = ll - lo;

           const char *format = first ? " %d:" INT32_FORMAT " (delta: %d)" :

                                        ", %d:" INT32_FORMAT " (delta: %d)";

           st->print(format, ll, dest[idx], dest[idx]-bci);

         }

         st->cr();

       }

       break;

     case Bytecodes::_lookupswitch:

       { align();

         int  default_dest = bci + get_int();

         int  len          = get_int();

         jint* key         = NEW_RESOURCE_ARRAY(jint, len);

         jint* dest        = NEW_RESOURCE_ARRAY(jint, len);

         for (int i = 0; i < len; i++) {

           key [i] = get_int();

           dest[i] = bci + get_int();

         };

         st->print(" %d %d ", default_dest, len);

         bool first = true;

         for (int ll = 0; ll < len; ll++, first = false)  {

           const char *format = first ? " " INT32_FORMAT ":" INT32_FORMAT :

                                        ", " INT32_FORMAT ":" INT32_FORMAT ;

           st->print(format, key[ll], dest[ll]);

         }

         st->cr();

       }

       break;

     case Bytecodes::_putstatic:

     case Bytecodes::_getstatic:

     case Bytecodes::_putfield:

     case Bytecodes::_getfield:

       print_field_or_method(get_index_u2_cpcache(), st);

       break;

     case Bytecodes::_invokevirtual:

     case Bytecodes::_invokespecial:

     case Bytecodes::_invokestatic:

       print_field_or_method(get_index_u2_cpcache(), st);

       break;

     case Bytecodes::_invokeinterface:

       { int i = get_index_u2_cpcache();

         int n = get_index_u1();

         get_byte();            // ignore zero byte

         print_field_or_method(i, st);

       }

       break;

     case Bytecodes::_invokedynamic:

       print_field_or_method(get_index_u4(), st);

       break;

     case Bytecodes::_new:

     case Bytecodes::_checkcast:

     case Bytecodes::_instanceof:

       { int i = get_index_u2();

         constantPoolOop constants = method()->constants();

         Symbol* name = constants->klass_name_at(i);

         st->print_cr(" %d <%s>", i, name->as_C_string());

       }

       break;

     case Bytecodes::_wide:

       // length is zero not one, but printed with no more info.

       break;

     default:

       ShouldNotReachHere();

       break;

   }

 }

 void BytecodePrinter::bytecode_epilog(int bci, outputStream* st) {

   methodDataOop mdo = method()->method_data();

   if (mdo != NULL) {

     ProfileData* data = mdo->bci_to_data(bci);

     if (data != NULL) {

       st->print("  %d", mdo->dp_to_di(data->dp()));

       st->fill_to(6);

       data->print_data_on(st);

     }

   }

 }

 #endif // PRODUCT