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 /*

  * Copyright (c) 1999, 2012, 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 "ci/ciCallSite.hpp"

 #include "ci/ciConstant.hpp"

 #include "ci/ciField.hpp"

 #include "ci/ciStreams.hpp"

 #include "ci/ciUtilities.hpp"

 // 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_Method()->constants());

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

 }

 // ------------------------------------------------------------------

 // ciBytecodeStream::get_constant_raw_index

 //

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

 // referenced constant.

 int ciBytecodeStream::get_constant_raw_index() const {

   // work-alike for Bytecode_loadconstant::raw_index()

   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_pool_index

 // Decode any reference index into a regular pool index.

 int ciBytecodeStream::get_constant_pool_index() const {

   // work-alike for Bytecode_loadconstant::pool_index()

   int index = get_constant_raw_index();

   if (has_cache_index()) {

     VM_ENTRY_MARK;

     constantPoolHandle cpool(_method->get_Method()->constants());

     return cpool->object_to_cp_index(index);

   }

   return index;

 }

 // ------------------------------------------------------------------

 // ciBytecodeStream::get_constant_cache_index

 // Return the CP cache index, or -1 if there isn't any.

 int ciBytecodeStream::get_constant_cache_index() const {

   // work-alike for Bytecode_loadconstant::cache_index()

   return has_cache_index() ? get_constant_raw_index() : -1;

 }

 // ------------------------------------------------------------------

 // ciBytecodeStream::get_constant

 //

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

 // constant.

 ciConstant ciBytecodeStream::get_constant() {

   int pool_index = get_constant_raw_index();

   int cache_index = -1;

   if (has_cache_index()) {

     cache_index = pool_index;

     pool_index = -1;

   }

   VM_ENTRY_MARK;

   constantPoolHandle cpool(_method->get_Method()->constants());

   return CURRENT_ENV->get_constant_by_index(cpool, pool_index, cache_index, _holder);

 }

 // ------------------------------------------------------------------

 // ciBytecodeStream::get_constant_pool_tag

 //

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

 // constant.

 constantTag ciBytecodeStream::get_constant_pool_tag(int index) const {

   VM_ENTRY_MARK;

   return _method->get_Method()->constants()->tag_at(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_Method()->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(

     ConstantPool* 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;

   ConstantPool* 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.

 // Additionally return the declared signature to get more concrete

 // type information if required (Cf. invokedynamic and invokehandle).

 ciMethod* ciBytecodeStream::get_method(bool& will_link, ciSignature* *declared_signature_result) {

   VM_ENTRY_MARK;

   ciEnv* env = CURRENT_ENV;

   constantPoolHandle cpool(_method->get_Method()->constants());

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

   will_link = m->is_loaded();

   // Get declared method signature and return it.

   if (has_optional_appendix()) {

     const int sig_index = get_method_signature_index();

     Symbol* sig_sym = cpool->symbol_at(sig_index);

     ciKlass* pool_holder = env->get_klass(cpool->pool_holder());

     (*declared_signature_result) = new (env->arena()) ciSignature(pool_holder, cpool, env->get_symbol(sig_sym));

   } else {

     (*declared_signature_result) = m->signature();

   }

   return m;

 }

 // ------------------------------------------------------------------

 // ciBytecodeStream::has_appendix

 //

 // Returns true if there is an appendix argument stored in the

 // constant pool cache at the current bci.

 bool ciBytecodeStream::has_appendix() {

   VM_ENTRY_MARK;

   constantPoolHandle cpool(_method->get_Method()->constants());

   return ConstantPool::has_appendix_at_if_loaded(cpool, get_method_index());

 }

 // ------------------------------------------------------------------

 // ciBytecodeStream::get_appendix

 //

 // Return the appendix argument stored in the constant pool cache at

 // the current bci.

 ciObject* ciBytecodeStream::get_appendix() {

   VM_ENTRY_MARK;

   constantPoolHandle cpool(_method->get_Method()->constants());

   oop appendix_oop = ConstantPool::appendix_at_if_loaded(cpool, get_method_index());

   return CURRENT_ENV->get_object(appendix_oop);

 }

 // ------------------------------------------------------------------

 // 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_Method()->constants());

   bool ignore;

   // report as MethodHandle for invokedynamic, which is syntactically classless

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

     return CURRENT_ENV->get_klass_by_name(_holder, ciSymbol::java_lang_invoke_MethodHandle(), 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() {

   ConstantPool* cpool = _method->get_Method()->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() {

   GUARDED_VM_ENTRY(

     ConstantPool* cpool = _holder->get_instanceKlass()->constants();

     const int method_index = get_method_index();

     const 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_resolved_references

 ciObjArray* ciBytecodeStream::get_resolved_references() {

     VM_ENTRY_MARK;

     // Get the constant pool.

   ConstantPool*        cpool   = _holder->get_instanceKlass()->constants();

   // Create a resolved references array and return it.

   return CURRENT_ENV->get_object(cpool->resolved_references())->as_obj_array();

   }