| /* |
| * 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(); |
| |
| // Use the MethodType stored in the CP cache to create a signature |
| // with correct types (in respect to class loaders). |
| if (has_method_type()) { |
| ciSymbol* sig_sym = env->get_symbol(cpool->symbol_at(get_method_signature_index())); |
| ciKlass* pool_holder = env->get_klass(cpool->pool_holder()); |
| ciMethodType* method_type = get_method_type(); |
| ciSignature* declared_signature = new (env->arena()) ciSignature(pool_holder, sig_sym, method_type); |
| (*declared_signature_result) = declared_signature; |
| } 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::has_method_type |
| // |
| // Returns true if there is a MethodType argument stored in the |
| // constant pool cache at the current bci. |
| bool ciBytecodeStream::has_method_type() { |
| GUARDED_VM_ENTRY( |
| constantPoolHandle cpool(_method->get_Method()->constants()); |
| return ConstantPool::has_method_type_at_if_loaded(cpool, get_method_index()); |
| ) |
| } |
| |
| // ------------------------------------------------------------------ |
| // ciBytecodeStream::get_method_type |
| // |
| // Return the MethodType stored in the constant pool cache at |
| // the current bci. |
| ciMethodType* ciBytecodeStream::get_method_type() { |
| GUARDED_VM_ENTRY( |
| constantPoolHandle cpool(_method->get_Method()->constants()); |
| oop method_type_oop = ConstantPool::method_type_at_if_loaded(cpool, get_method_index()); |
| return CURRENT_ENV->get_object(method_type_oop)->as_method_type(); |
| ) |
| } |
| |
| // ------------------------------------------------------------------ |
| // 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(); |
| } |