| /* |
| * Copyright 1999-2005 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::wide |
| // |
| // Special handling for the wide bytcode |
| Bytecodes::Code ciBytecodeStream::wide() |
| { |
| // Get following bytecode; do not return wide |
| Bytecodes::Code bc = (Bytecodes::Code)_pc[1]; |
| _pc += 2; // Skip both bytecodes |
| _pc += 2; // Skip index always |
| if( bc == Bytecodes::_iinc ) |
| _pc += 2; // Skip optional constant |
| _was_wide = _pc; // Flag last wide bytecode found |
| return bc; |
| } |
| |
| // ------------------------------------------------------------------ |
| // ciBytecodeStream::table |
| // |
| // Special handling for switch ops |
| Bytecodes::Code ciBytecodeStream::table( Bytecodes::Code bc ) { |
| switch( bc ) { // Check for special bytecode handling |
| |
| 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(); |
| 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_big(); |
| 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) { |
| return CURRENT_ENV->get_klass_by_index(_holder, get_klass_index(), |
| will_link); |
| } |
| |
| // ------------------------------------------------------------------ |
| // 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(); |
| case Bytecodes::_ldc_w: |
| case Bytecodes::_ldc2_w: |
| return get_index_big(); |
| default: |
| ShouldNotReachHere(); |
| return 0; |
| } |
| } |
| // ------------------------------------------------------------------ |
| // ciBytecodeStream::get_constant |
| // |
| // If this bytecode is one of the ldc variants, get the referenced |
| // constant. |
| ciConstant ciBytecodeStream::get_constant() { |
| return CURRENT_ENV->get_constant_by_index(_holder, get_constant_index()); |
| } |
| |
| // ------------------------------------------------------------------ |
| 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_big(); |
| } |
| |
| |
| // ------------------------------------------------------------------ |
| // 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() { |
| int holder_index = get_field_holder_index(); |
| bool ignore; |
| return CURRENT_ENV->get_klass_by_index(_holder, holder_index, ignore) |
| ->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() { |
| VM_ENTRY_MARK; |
| 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() { |
| switch (cur_bc()) { |
| case Bytecodes::_invokeinterface: |
| return Bytes::get_Java_u2(_pc-4); |
| case Bytecodes::_invokevirtual: |
| case Bytecodes::_invokespecial: |
| case Bytecodes::_invokestatic: |
| return get_index_big(); |
| default: |
| ShouldNotReachHere(); |
| return 0; |
| } |
| } |
| |
| // ------------------------------------------------------------------ |
| // ciBytecodeStream::get_method |
| // |
| // If this is a method invocation bytecode, get the invoked method. |
| ciMethod* ciBytecodeStream::get_method(bool& will_link) { |
| ciMethod* m = CURRENT_ENV->get_method_by_index(_holder, get_method_index(),cur_bc()); |
| 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() { |
| bool ignore; |
| return CURRENT_ENV->get_klass_by_index(_holder, get_method_holder_index(), ignore); |
| } |
| |
| // ------------------------------------------------------------------ |
| // 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() { |
| VM_ENTRY_MARK; |
| constantPoolOop cpool = _holder->get_instanceKlass()->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); |
| } |