jdk8-mips64-public/hotspot: src/share/vm/ci/ciStreams.cpp@e9ff18c4ace7

     1 /*

     2  * Copyright (c) 1999, 2010, 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.

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    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_ciStreams.cpp.incl"

    28 // ciExceptionHandlerStream

    29 //

    30 // Walk over some selected set of a methods exception handlers.

    32 // ------------------------------------------------------------------

    33 // ciExceptionHandlerStream::count

    34 //

    35 // How many exception handlers are there in this stream?

    36 //

    37 // Implementation note: Compiler2 needs this functionality, so I had

    38 int ciExceptionHandlerStream::count() {

    39   int save_pos = _pos;

    40   int save_end = _end;

    42   int count = 0;

    44   _pos = -1;

    45   _end = _method->_handler_count;

    48   next();

    49   while (!is_done()) {

    50     count++;

    51     next();

    52   }

    54   _pos = save_pos;

    55   _end = save_end;

    57   return count;

    58 }

    60 int ciExceptionHandlerStream::count_remaining() {

    61   int save_pos = _pos;

    62   int save_end = _end;

    64   int count = 0;

    66   while (!is_done()) {

    67     count++;

    68     next();

    69   }

    71   _pos = save_pos;

    72   _end = save_end;

    74   return count;

    75 }

    77 // ciBytecodeStream

    78 //

    79 // The class is used to iterate over the bytecodes of a method.

    80 // It hides the details of constant pool structure/access by

    81 // providing accessors for constant pool items.

    83 // ------------------------------------------------------------------

    84 // ciBytecodeStream::next_wide_or_table

    85 //

    86 // Special handling for switch ops

    87 Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) {

    88   switch (bc) {                // Check for special bytecode handling

    89   case Bytecodes::_wide:

    90     // Special handling for the wide bytcode

    91     // Get following bytecode; do not return wide

    92     assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, "");

    93     bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]);

    94     assert(Bytecodes::wide_length_for(bc) > 2, "must make progress");

    95     _pc += Bytecodes::wide_length_for(bc);

    96     _was_wide = _pc;              // Flag last wide bytecode found

    97     assert(is_wide(), "accessor works right");

    98     break;

   100   case Bytecodes::_lookupswitch:

   101     _pc++;                      // Skip wide bytecode

   102     _pc += (_start-_pc)&3;      // Word align

   103     _table_base = (jint*)_pc;   // Capture for later usage

   104                                 // table_base[0] is default far_dest

   105     // Table has 2 lead elements (default, length), then pairs of u4 values.

   106     // So load table length, and compute address at end of table

   107     _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])];

   108     break;

   110   case Bytecodes::_tableswitch: {

   111     _pc++;                      // Skip wide bytecode

   112     _pc += (_start-_pc)&3;      // Word align

   113     _table_base = (jint*)_pc;   // Capture for later usage

   114                                 // table_base[0] is default far_dest

   115     int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound

   116     int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound

   117     int len = hi - lo + 1;      // Dense table size

   118     _pc = (address)&_table_base[3+len]; // Skip past table

   119     break;

   120   }

   122   default:

   123     fatal("unhandled bytecode");

   124   }

   125   return bc;

   126 }

   128 // ------------------------------------------------------------------

   129 // ciBytecodeStream::reset_to_bci

   130 void ciBytecodeStream::reset_to_bci( int bci ) {

   131   _bc_start=_was_wide=0;

   132   _pc = _start+bci;

   133 }

   135 // ------------------------------------------------------------------

   136 // ciBytecodeStream::force_bci

   137 void ciBytecodeStream::force_bci(int bci) {

   138   if (bci < 0) {

   139     reset_to_bci(0);

   140     _bc_start = _start + bci;

   141     _bc = EOBC();

   142   } else {

   143     reset_to_bci(bci);

   144     next();

   145   }

   146 }

   149 // ------------------------------------------------------------------

   150 // Constant pool access

   151 // ------------------------------------------------------------------

   153 // ------------------------------------------------------------------

   154 // ciBytecodeStream::get_klass_index

   155 //

   156 // If this bytecodes references a klass, return the index of the

   157 // referenced klass.

   158 int ciBytecodeStream::get_klass_index() const {

   159   switch(cur_bc()) {

   160   case Bytecodes::_ldc:

   161     return get_index_u1();

   162   case Bytecodes::_ldc_w:

   163   case Bytecodes::_ldc2_w:

   164   case Bytecodes::_checkcast:

   165   case Bytecodes::_instanceof:

   166   case Bytecodes::_anewarray:

   167   case Bytecodes::_multianewarray:

   168   case Bytecodes::_new:

   169   case Bytecodes::_newarray:

   170     return get_index_u2();

   171   default:

   172     ShouldNotReachHere();

   173     return 0;

   174   }

   175 }

   177 // ------------------------------------------------------------------

   178 // ciBytecodeStream::get_klass

   179 //

   180 // If this bytecode is a new, newarray, multianewarray, instanceof,

   181 // or checkcast, get the referenced klass.

   182 ciKlass* ciBytecodeStream::get_klass(bool& will_link) {

   183   VM_ENTRY_MARK;

   184   constantPoolHandle cpool(_method->get_methodOop()->constants());

   185   return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder);

   186 }

   188 // ------------------------------------------------------------------

   189 // ciBytecodeStream::get_constant_index

   190 //

   191 // If this bytecode is one of the ldc variants, get the index of the

   192 // referenced constant.

   193 int ciBytecodeStream::get_constant_index() const {

   194   switch(cur_bc()) {

   195   case Bytecodes::_ldc:

   196     return get_index_u1();

   197   case Bytecodes::_ldc_w:

   198   case Bytecodes::_ldc2_w:

   199     return get_index_u2();

   200   default:

   201     ShouldNotReachHere();

   202     return 0;

   203   }

   204 }

   205 // ------------------------------------------------------------------

   206 // ciBytecodeStream::get_constant

   207 //

   208 // If this bytecode is one of the ldc variants, get the referenced

   209 // constant.

   210 ciConstant ciBytecodeStream::get_constant() {

   211   VM_ENTRY_MARK;

   212   constantPoolHandle cpool(_method->get_methodOop()->constants());

   213   return CURRENT_ENV->get_constant_by_index(cpool, get_constant_index(), _holder);

   214 }

   216 // ------------------------------------------------------------------

   217 bool ciBytecodeStream::is_unresolved_string() const {

   218   return CURRENT_ENV->is_unresolved_string(_holder, get_constant_index());

   219 }

   221 // ------------------------------------------------------------------

   222 bool ciBytecodeStream::is_unresolved_klass() const {

   223   return CURRENT_ENV->is_unresolved_klass(_holder, get_klass_index());

   224 }

   226 // ------------------------------------------------------------------

   227 // ciBytecodeStream::get_field_index

   228 //

   229 // If this is a field access bytecode, get the constant pool

   230 // index of the referenced field.

   231 int ciBytecodeStream::get_field_index() {

   232   assert(cur_bc() == Bytecodes::_getfield ||

   233          cur_bc() == Bytecodes::_putfield ||

   234          cur_bc() == Bytecodes::_getstatic ||

   235          cur_bc() == Bytecodes::_putstatic, "wrong bc");

   236   return get_index_u2_cpcache();

   237 }

   240 // ------------------------------------------------------------------

   241 // ciBytecodeStream::get_field

   242 //

   243 // If this bytecode is one of get_field, get_static, put_field,

   244 // or put_static, get the referenced field.

   245 ciField* ciBytecodeStream::get_field(bool& will_link) {

   246   ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());

   247   will_link = f->will_link(_holder, _bc);

   248   return f;

   249 }

   252 // ------------------------------------------------------------------

   253 // ciBytecodeStream::get_declared_field_holder

   254 //

   255 // Get the declared holder of the currently referenced field.

   256 //

   257 // Usage note: the holder() of a ciField class returns the canonical

   258 // holder of the field, rather than the holder declared in the

   259 // bytecodes.

   260 //

   261 // There is no "will_link" result passed back.  The user is responsible

   262 // for checking linkability when retrieving the associated field.

   263 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {

   264   VM_ENTRY_MARK;

   265   constantPoolHandle cpool(_method->get_methodOop()->constants());

   266   int holder_index = get_field_holder_index();

   267   bool ignore;

   268   return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)

   269       ->as_instance_klass();

   270 }

   272 // ------------------------------------------------------------------

   273 // ciBytecodeStream::get_field_holder_index

   274 //

   275 // Get the constant pool index of the declared holder of the field

   276 // referenced by the current bytecode.  Used for generating

   277 // deoptimization information.

   278 int ciBytecodeStream::get_field_holder_index() {

   279   GUARDED_VM_ENTRY(

   280     constantPoolOop cpool = _holder->get_instanceKlass()->constants();

   281     return cpool->klass_ref_index_at(get_field_index());

   282   )

   283 }

   285 // ------------------------------------------------------------------

   286 // ciBytecodeStream::get_field_signature_index

   287 //

   288 // Get the constant pool index of the signature of the field

   289 // referenced by the current bytecode.  Used for generating

   290 // deoptimization information.

   291 int ciBytecodeStream::get_field_signature_index() {

   292   VM_ENTRY_MARK;

   293   constantPoolOop cpool = _holder->get_instanceKlass()->constants();

   294   int nt_index = cpool->name_and_type_ref_index_at(get_field_index());

   295   return cpool->signature_ref_index_at(nt_index);

   296 }

   298 // ------------------------------------------------------------------

   299 // ciBytecodeStream::get_method_index

   300 //

   301 // If this is a method invocation bytecode, get the constant pool

   302 // index of the invoked method.

   303 int ciBytecodeStream::get_method_index() {

   304 #ifdef ASSERT

   305   switch (cur_bc()) {

   306   case Bytecodes::_invokeinterface:

   307   case Bytecodes::_invokevirtual:

   308   case Bytecodes::_invokespecial:

   309   case Bytecodes::_invokestatic:

   310   case Bytecodes::_invokedynamic:

   311     break;

   312   default:

   313     ShouldNotReachHere();

   314   }

   315 #endif

   316   if (has_index_u4())

   317     return get_index_u4();  // invokedynamic

   318   return get_index_u2_cpcache();

   319 }

   321 // ------------------------------------------------------------------

   322 // ciBytecodeStream::get_method

   323 //

   324 // If this is a method invocation bytecode, get the invoked method.

   325 ciMethod* ciBytecodeStream::get_method(bool& will_link) {

   326   VM_ENTRY_MARK;

   327   constantPoolHandle cpool(_method->get_methodOop()->constants());

   328   ciMethod* m = CURRENT_ENV->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder);

   329   will_link = m->is_loaded();

   330   return m;

   331 }

   333 // ------------------------------------------------------------------

   334 // ciBytecodeStream::get_declared_method_holder

   335 //

   336 // Get the declared holder of the currently referenced method.

   337 //

   338 // Usage note: the holder() of a ciMethod class returns the canonical

   339 // holder of the method, rather than the holder declared in the

   340 // bytecodes.

   341 //

   342 // There is no "will_link" result passed back.  The user is responsible

   343 // for checking linkability when retrieving the associated method.

   344 ciKlass* ciBytecodeStream::get_declared_method_holder() {

   345   VM_ENTRY_MARK;

   346   constantPoolHandle cpool(_method->get_methodOop()->constants());

   347   bool ignore;

   348   // report as InvokeDynamic for invokedynamic, which is syntactically classless

   349   if (cur_bc() == Bytecodes::_invokedynamic)

   350     return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_dyn_InvokeDynamic(), false);

   351   return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder);

   352 }

   354 // ------------------------------------------------------------------

   355 // ciBytecodeStream::get_method_holder_index

   356 //

   357 // Get the constant pool index of the declared holder of the method

   358 // referenced by the current bytecode.  Used for generating

   359 // deoptimization information.

   360 int ciBytecodeStream::get_method_holder_index() {

   361   constantPoolOop cpool = _method->get_methodOop()->constants();

   362   return cpool->klass_ref_index_at(get_method_index());

   363 }

   365 // ------------------------------------------------------------------

   366 // ciBytecodeStream::get_method_signature_index

   367 //

   368 // Get the constant pool index of the signature of the method

   369 // referenced by the current bytecode.  Used for generating

   370 // deoptimization information.

   371 int ciBytecodeStream::get_method_signature_index() {

   372   VM_ENTRY_MARK;

   373   constantPoolOop cpool = _holder->get_instanceKlass()->constants();

   374   int method_index = get_method_index();

   375   int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);

   376   return cpool->signature_ref_index_at(name_and_type_index);

   377 }

   379 // ------------------------------------------------------------------

   380 // ciBytecodeStream::get_cpcache

   381 ciCPCache* ciBytecodeStream::get_cpcache() {

   382   VM_ENTRY_MARK;

   383   // Get the constant pool.

   384   constantPoolOop      cpool   = _holder->get_instanceKlass()->constants();

   385   constantPoolCacheOop cpcache = cpool->cache();

   387   return CURRENT_ENV->get_object(cpcache)->as_cpcache();

   388 }

   390 // ------------------------------------------------------------------

   391 // ciBytecodeStream::get_call_site

   392 ciCallSite* ciBytecodeStream::get_call_site() {

   393   VM_ENTRY_MARK;

   394   // Get the constant pool.

   395   constantPoolOop      cpool   = _holder->get_instanceKlass()->constants();

   396   constantPoolCacheOop cpcache = cpool->cache();

   398   // Get the CallSite from the constant pool cache.

   399   int method_index = get_method_index();

   400   ConstantPoolCacheEntry* cpcache_entry = cpcache->secondary_entry_at(method_index);

   401   oop call_site_oop = cpcache_entry->f1();

   403   // Create a CallSite object and return it.

   404   return CURRENT_ENV->get_object(call_site_oop)->as_call_site();

   405 }

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

src/share/vm/ci/ciStreams.cpp@e9ff18c4ace7

src/share/vm/ci/ciStreams.cpp