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view src/share/vm/ci/ciObjArrayKlass.cpp @ 8331:1f1c33c860a1
Enable convert deopts to guards optimization.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 17 Mar 2013 21:27:09 +0100 |
parents | d8ce2825b193 |
children | d13d7aba8c12 |
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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/ciInstanceKlass.hpp" #include "ci/ciObjArrayKlass.hpp" #include "ci/ciSymbol.hpp" #include "ci/ciUtilities.hpp" #include "oops/objArrayKlass.hpp" // ciObjArrayKlass // // This class represents a Klass* in the HotSpot virtual machine // whose Klass part is an ObjArrayKlass. // ------------------------------------------------------------------ // ciObjArrayKlass::ciObjArrayKlass // // Constructor for loaded object array klasses. ciObjArrayKlass::ciObjArrayKlass(KlassHandle h_k) : ciArrayKlass(h_k) { assert(get_Klass()->oop_is_objArray(), "wrong type"); Klass* element_Klass = get_ObjArrayKlass()->bottom_klass(); _base_element_klass = CURRENT_ENV->get_klass(element_Klass); assert(_base_element_klass->is_instance_klass() || _base_element_klass->is_type_array_klass(), "bad base klass"); if (dimension() == 1) { _element_klass = _base_element_klass; } else { _element_klass = NULL; } if (!ciObjectFactory::is_initialized()) { assert(_element_klass->is_java_lang_Object(), "only arrays of object are shared"); } } // ------------------------------------------------------------------ // ciObjArrayKlass::ciObjArrayKlass // // Constructor for unloaded object array klasses. ciObjArrayKlass::ciObjArrayKlass(ciSymbol* array_name, ciKlass* base_element_klass, int dimension) : ciArrayKlass(array_name, dimension, T_OBJECT) { _base_element_klass = base_element_klass; assert(_base_element_klass->is_instance_klass() || _base_element_klass->is_type_array_klass(), "bad base klass"); if (dimension == 1) { _element_klass = base_element_klass; } else { _element_klass = NULL; } } // ------------------------------------------------------------------ // ciObjArrayKlass::element_klass // // What is the one-level element type of this array? ciKlass* ciObjArrayKlass::element_klass() { if (_element_klass == NULL) { assert(dimension() > 1, "_element_klass should not be NULL"); // Produce the element klass. if (is_loaded()) { VM_ENTRY_MARK; Klass* element_Klass = get_ObjArrayKlass()->element_klass(); _element_klass = CURRENT_THREAD_ENV->get_klass(element_Klass); } else { VM_ENTRY_MARK; // We are an unloaded array klass. Attempt to fetch our // element klass by name. _element_klass = CURRENT_THREAD_ENV->get_klass_by_name_impl( this, constantPoolHandle(), construct_array_name(base_element_klass()->name(), dimension() - 1), false); } } return _element_klass; } // ------------------------------------------------------------------ // ciObjArrayKlass::construct_array_name // // Build an array name from an element name and a dimension. ciSymbol* ciObjArrayKlass::construct_array_name(ciSymbol* element_name, int dimension) { EXCEPTION_CONTEXT; int element_len = element_name->utf8_length(); Symbol* base_name_sym = element_name->get_symbol(); char* name; if (base_name_sym->byte_at(0) == '[' || (base_name_sym->byte_at(0) == 'L' && // watch package name 'Lxx' base_name_sym->byte_at(element_len-1) == ';')) { int new_len = element_len + dimension + 1; // for the ['s and '\0' name = CURRENT_THREAD_ENV->name_buffer(new_len); int pos = 0; for ( ; pos < dimension; pos++) { name[pos] = '['; } strncpy(name+pos, (char*)element_name->base(), element_len); name[new_len-1] = '\0'; } else { int new_len = 3 // for L, ;, and '\0' + dimension // for ['s + element_len; name = CURRENT_THREAD_ENV->name_buffer(new_len); int pos = 0; for ( ; pos < dimension; pos++) { name[pos] = '['; } name[pos++] = 'L'; strncpy(name+pos, (char*)element_name->base(), element_len); name[new_len-2] = ';'; name[new_len-1] = '\0'; } return ciSymbol::make(name); } // ------------------------------------------------------------------ // ciObjArrayKlass::make_impl // // Implementation of make. ciObjArrayKlass* ciObjArrayKlass::make_impl(ciKlass* element_klass) { if (element_klass->is_loaded()) { EXCEPTION_CONTEXT; // The element klass is loaded Klass* array = element_klass->get_Klass()->array_klass(THREAD); if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; CURRENT_THREAD_ENV->record_out_of_memory_failure(); return ciEnv::unloaded_ciobjarrayklass(); } return CURRENT_THREAD_ENV->get_obj_array_klass(array); } // The array klass was unable to be made or the element klass was // not loaded. ciSymbol* array_name = construct_array_name(element_klass->name(), 1); if (array_name == ciEnv::unloaded_cisymbol()) { return ciEnv::unloaded_ciobjarrayklass(); } return CURRENT_ENV->get_unloaded_klass(element_klass, array_name) ->as_obj_array_klass(); } // ------------------------------------------------------------------ // ciObjArrayKlass::make // // Make an array klass corresponding to the specified primitive type. ciObjArrayKlass* ciObjArrayKlass::make(ciKlass* element_klass) { GUARDED_VM_ENTRY(return make_impl(element_klass);) }