jdk8-mips64-public/hotspot: src/share/vm/ci/ciStreams.cpp@ab102d5d923e (annotated)

src/share/vm/ci/ciStreams.cpp@ab102d5d923e (annotated)

src/share/vm/ci/ciStreams.cpp

Sun, 23 May 2010 01:38:26 -0700

author: jrose
date: Sun, 23 May 2010 01:38:26 -0700
changeset 1920: ab102d5d923e
parent 1573: dd57230ba8fe
child 1934: e9ff18c4ace7
permissions: -rw-r--r--

6939207: refactor constant pool index processing
Summary: Factored cleanup of instruction decode which prepares for enhanced ldc semantics.
Reviewed-by: twisti

 /*
  * Copyright 1999-2010 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_ciStreams.cpp.incl"
 // ciExceptionHandlerStream
 //
 // Walk over some selected set of a methods exception handlers.
 // ------------------------------------------------------------------
 // ciExceptionHandlerStream::count
 //
 // How many exception handlers are there in this stream?
 //
 // Implementation note: Compiler2 needs this functionality, so I had
 int ciExceptionHandlerStream::count() {
   int save_pos = _pos;
   int save_end = _end;
   int count = 0;
   _pos = -1;
   _end = _method->_handler_count;
   next();
   while (!is_done()) {
     count++;
     next();
   }
   _pos = save_pos;
   _end = save_end;
   return count;
 }
 int ciExceptionHandlerStream::count_remaining() {
   int save_pos = _pos;
   int save_end = _end;
   int count = 0;
   while (!is_done()) {
     count++;
     next();
   }
   _pos = save_pos;
   _end = save_end;
   return count;
 }
 // ciBytecodeStream
 //
 // The class is used to iterate over the bytecodes of a method.
 // It hides the details of constant pool structure/access by
 // providing accessors for constant pool items.
 // ------------------------------------------------------------------
 // ciBytecodeStream::next_wide_or_table
 //
 // Special handling for switch ops
 Bytecodes::Code ciBytecodeStream::next_wide_or_table(Bytecodes::Code bc) {
   switch (bc) {                // Check for special bytecode handling
   case Bytecodes::_wide:
     // Special handling for the wide bytcode
     // Get following bytecode; do not return wide
     assert(Bytecodes::Code(_pc[0]) == Bytecodes::_wide, "");
     bc = Bytecodes::java_code(_raw_bc = (Bytecodes::Code)_pc[1]);
     assert(Bytecodes::wide_length_for(bc) > 2, "must make progress");
     _pc += Bytecodes::wide_length_for(bc);
     _was_wide = _pc;              // Flag last wide bytecode found
     assert(is_wide(), "accessor works right");
     break;
   case Bytecodes::_lookupswitch:
     _pc++;                      // Skip wide bytecode
     _pc += (_start-_pc)&3;      // Word align
     _table_base = (jint*)_pc;   // Capture for later usage
                                 // table_base[0] is default far_dest
     // Table has 2 lead elements (default, length), then pairs of u4 values.
     // So load table length, and compute address at end of table
     _pc = (address)&_table_base[2+ 2*Bytes::get_Java_u4((address)&_table_base[1])];
     break;
   case Bytecodes::_tableswitch: {
     _pc++;                      // Skip wide bytecode
     _pc += (_start-_pc)&3;      // Word align
     _table_base = (jint*)_pc;   // Capture for later usage
                                 // table_base[0] is default far_dest
     int lo = Bytes::get_Java_u4((address)&_table_base[1]);// Low bound
     int hi = Bytes::get_Java_u4((address)&_table_base[2]);// High bound
     int len = hi - lo + 1;      // Dense table size
     _pc = (address)&_table_base[3+len]; // Skip past table
     break;
   }
   default:
     fatal("unhandled bytecode");
   }
   return bc;
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::reset_to_bci
 void ciBytecodeStream::reset_to_bci( int bci ) {
   _bc_start=_was_wide=0;
   _pc = _start+bci;
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::force_bci
 void ciBytecodeStream::force_bci(int bci) {
   if (bci < 0) {
     reset_to_bci(0);
     _bc_start = _start + bci;
     _bc = EOBC();
   } else {
     reset_to_bci(bci);
     next();
   }
 }
 // ------------------------------------------------------------------
 // Constant pool access
 // ------------------------------------------------------------------
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_klass_index
 //
 // If this bytecodes references a klass, return the index of the
 // referenced klass.
 int ciBytecodeStream::get_klass_index() const {
   switch(cur_bc()) {
   case Bytecodes::_ldc:
     return get_index_u1();
   case Bytecodes::_ldc_w:
   case Bytecodes::_ldc2_w:
   case Bytecodes::_checkcast:
   case Bytecodes::_instanceof:
   case Bytecodes::_anewarray:
   case Bytecodes::_multianewarray:
   case Bytecodes::_new:
   case Bytecodes::_newarray:
     return get_index_u2();
   default:
     ShouldNotReachHere();
     return 0;
   }
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_klass
 //
 // If this bytecode is a new, newarray, multianewarray, instanceof,
 // or checkcast, get the referenced klass.
 ciKlass* ciBytecodeStream::get_klass(bool& will_link) {
   VM_ENTRY_MARK;
   constantPoolHandle cpool(_method->get_methodOop()->constants());
   return CURRENT_ENV->get_klass_by_index(cpool, get_klass_index(), will_link, _holder);
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_constant_index
 //
 // If this bytecode is one of the ldc variants, get the index of the
 // referenced constant.
 int ciBytecodeStream::get_constant_index() const {
   switch(cur_bc()) {
   case Bytecodes::_ldc:
     return get_index_u1();
   case Bytecodes::_ldc_w:
   case Bytecodes::_ldc2_w:
     return get_index_u2();
   default:
     ShouldNotReachHere();
     return 0;
   }
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_constant
 //
 // If this bytecode is one of the ldc variants, get the referenced
 // constant.
 ciConstant ciBytecodeStream::get_constant() {
   VM_ENTRY_MARK;
   constantPoolHandle cpool(_method->get_methodOop()->constants());
   return CURRENT_ENV->get_constant_by_index(cpool, get_constant_index(), _holder);
 }
 // ------------------------------------------------------------------
 bool ciBytecodeStream::is_unresolved_string() const {
   return CURRENT_ENV->is_unresolved_string(_holder, get_constant_index());
 }
 // ------------------------------------------------------------------
 bool ciBytecodeStream::is_unresolved_klass() const {
   return CURRENT_ENV->is_unresolved_klass(_holder, get_klass_index());
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_field_index
 //
 // If this is a field access bytecode, get the constant pool
 // index of the referenced field.
 int ciBytecodeStream::get_field_index() {
   assert(cur_bc() == Bytecodes::_getfield ||
          cur_bc() == Bytecodes::_putfield ||
          cur_bc() == Bytecodes::_getstatic ||
          cur_bc() == Bytecodes::_putstatic, "wrong bc");
   return get_index_u2_cpcache();
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_field
 //
 // If this bytecode is one of get_field, get_static, put_field,
 // or put_static, get the referenced field.
 ciField* ciBytecodeStream::get_field(bool& will_link) {
   ciField* f = CURRENT_ENV->get_field_by_index(_holder, get_field_index());
   will_link = f->will_link(_holder, _bc);
   return f;
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_declared_field_holder
 //
 // Get the declared holder of the currently referenced field.
 //
 // Usage note: the holder() of a ciField class returns the canonical
 // holder of the field, rather than the holder declared in the
 // bytecodes.
 //
 // There is no "will_link" result passed back.  The user is responsible
 // for checking linkability when retrieving the associated field.
 ciInstanceKlass* ciBytecodeStream::get_declared_field_holder() {
   VM_ENTRY_MARK;
   constantPoolHandle cpool(_method->get_methodOop()->constants());
   int holder_index = get_field_holder_index();
   bool ignore;
   return CURRENT_ENV->get_klass_by_index(cpool, holder_index, ignore, _holder)
       ->as_instance_klass();
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_field_holder_index
 //
 // Get the constant pool index of the declared holder of the field
 // referenced by the current bytecode.  Used for generating
 // deoptimization information.
 int ciBytecodeStream::get_field_holder_index() {
   GUARDED_VM_ENTRY(
     constantPoolOop cpool = _holder->get_instanceKlass()->constants();
     return cpool->klass_ref_index_at(get_field_index());
   )
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_field_signature_index
 //
 // Get the constant pool index of the signature of the field
 // referenced by the current bytecode.  Used for generating
 // deoptimization information.
 int ciBytecodeStream::get_field_signature_index() {
   VM_ENTRY_MARK;
   constantPoolOop cpool = _holder->get_instanceKlass()->constants();
   int nt_index = cpool->name_and_type_ref_index_at(get_field_index());
   return cpool->signature_ref_index_at(nt_index);
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_method_index
 //
 // If this is a method invocation bytecode, get the constant pool
 // index of the invoked method.
 int ciBytecodeStream::get_method_index() {
 #ifdef ASSERT
   switch (cur_bc()) {
   case Bytecodes::_invokeinterface:
   case Bytecodes::_invokevirtual:
   case Bytecodes::_invokespecial:
   case Bytecodes::_invokestatic:
   case Bytecodes::_invokedynamic:
     break;
   default:
     ShouldNotReachHere();
   }
 #endif
   if (has_index_u4())
     return get_index_u4();  // invokedynamic
   return get_index_u2_cpcache();
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_method
 //
 // If this is a method invocation bytecode, get the invoked method.
 ciMethod* ciBytecodeStream::get_method(bool& will_link) {
   VM_ENTRY_MARK;
   constantPoolHandle cpool(_method->get_methodOop()->constants());
   ciMethod* m = CURRENT_ENV->get_method_by_index(cpool, get_method_index(), cur_bc(), _holder);
   will_link = m->is_loaded();
   return m;
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_declared_method_holder
 //
 // Get the declared holder of the currently referenced method.
 //
 // Usage note: the holder() of a ciMethod class returns the canonical
 // holder of the method, rather than the holder declared in the
 // bytecodes.
 //
 // There is no "will_link" result passed back.  The user is responsible
 // for checking linkability when retrieving the associated method.
 ciKlass* ciBytecodeStream::get_declared_method_holder() {
   VM_ENTRY_MARK;
   constantPoolHandle cpool(_method->get_methodOop()->constants());
   bool ignore;
   // report as InvokeDynamic for invokedynamic, which is syntactically classless
   if (cur_bc() == Bytecodes::_invokedynamic)
     return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_dyn_InvokeDynamic(), false);
   return CURRENT_ENV->get_klass_by_index(cpool, get_method_holder_index(), ignore, _holder);
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_method_holder_index
 //
 // Get the constant pool index of the declared holder of the method
 // referenced by the current bytecode.  Used for generating
 // deoptimization information.
 int ciBytecodeStream::get_method_holder_index() {
   constantPoolOop cpool = _method->get_methodOop()->constants();
   return cpool->klass_ref_index_at(get_method_index());
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_method_signature_index
 //
 // Get the constant pool index of the signature of the method
 // referenced by the current bytecode.  Used for generating
 // deoptimization information.
 int ciBytecodeStream::get_method_signature_index() {
   VM_ENTRY_MARK;
   constantPoolOop cpool = _holder->get_instanceKlass()->constants();
   int method_index = get_method_index();
   int name_and_type_index = cpool->name_and_type_ref_index_at(method_index);
   return cpool->signature_ref_index_at(name_and_type_index);
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_cpcache
 ciCPCache* ciBytecodeStream::get_cpcache() {
   VM_ENTRY_MARK;
   // Get the constant pool.
   constantPoolOop      cpool   = _holder->get_instanceKlass()->constants();
   constantPoolCacheOop cpcache = cpool->cache();
   return CURRENT_ENV->get_object(cpcache)->as_cpcache();
 }
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_call_site
 ciCallSite* ciBytecodeStream::get_call_site() {
   VM_ENTRY_MARK;
   // Get the constant pool.
   constantPoolOop      cpool   = _holder->get_instanceKlass()->constants();
   constantPoolCacheOop cpcache = cpool->cache();
   // Get the CallSite from the constant pool cache.
   int method_index = get_method_index();
   ConstantPoolCacheEntry* cpcache_entry = cpcache->secondary_entry_at(method_index);
   oop call_site_oop = cpcache_entry->f1();
   // Create a CallSite object and return it.
   return CURRENT_ENV->get_object(call_site_oop)->as_call_site();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciStreams.cpp@ab102d5d923e (annotated)

src/share/vm/ci/ciStreams.cpp