twisti@2047: /*
stefank@2314:  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
twisti@2047:  * Copyright 2009 Red Hat, Inc.
twisti@2047:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
twisti@2047:  *
twisti@2047:  * This code is free software; you can redistribute it and/or modify it
twisti@2047:  * under the terms of the GNU General Public License version 2 only, as
twisti@2047:  * published by the Free Software Foundation.
twisti@2047:  *
twisti@2047:  * This code is distributed in the hope that it will be useful, but WITHOUT
twisti@2047:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
twisti@2047:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
twisti@2047:  * version 2 for more details (a copy is included in the LICENSE file that
twisti@2047:  * accompanied this code).
twisti@2047:  *
twisti@2047:  * You should have received a copy of the GNU General Public License version
twisti@2047:  * 2 along with this work; if not, write to the Free Software Foundation,
twisti@2047:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
twisti@2047:  *
twisti@2047:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
twisti@2047:  * or visit www.oracle.com if you need additional information or have any
twisti@2047:  * questions.
twisti@2047:  *
twisti@2047:  */
twisti@2047: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "ci/ciInstance.hpp"
stefank@2314: #include "ci/ciStreams.hpp"
stefank@2314: #include "shark/sharkBuilder.hpp"
stefank@2314: #include "shark/sharkConstant.hpp"
stefank@2314: #include "shark/sharkValue.hpp"
twisti@2047: 
twisti@2047: using namespace llvm;
twisti@2047: 
twisti@2047: SharkConstant* SharkConstant::for_ldc(ciBytecodeStream *iter) {
twisti@2047:   ciConstant constant = iter->get_constant();
twisti@2047:   ciType *type = NULL;
twisti@2047:   if (constant.basic_type() == T_OBJECT) {
twisti@2047:     ciEnv *env = ciEnv::current();
twisti@4444: 
twisti@4444:     assert(constant.as_object()->klass() == env->String_klass()
twisti@4444:            || constant.as_object()->klass() == env->Class_klass()
twisti@4444:            || constant.as_object()->klass()->is_subtype_of(env->MethodType_klass())
twisti@4444:            || constant.as_object()->klass()->is_subtype_of(env->MethodHandle_klass()), "should be");
twisti@4444: 
twisti@4314:     type = constant.as_object()->klass();
twisti@2047:   }
twisti@2047:   return new SharkConstant(constant, type);
twisti@2047: }
twisti@2047: 
twisti@2047: SharkConstant* SharkConstant::for_field(ciBytecodeStream *iter) {
twisti@2047:   bool will_link;
twisti@2047:   ciField *field = iter->get_field(will_link);
twisti@2047:   assert(will_link, "typeflow responsibility");
twisti@2047: 
twisti@2047:   return new SharkConstant(field->constant_value(), field->type());
twisti@2047: }
twisti@2047: 
twisti@2047: SharkConstant::SharkConstant(ciConstant constant, ciType *type) {
twisti@2047:   SharkValue *value = NULL;
twisti@2047: 
twisti@2047:   switch (constant.basic_type()) {
twisti@2047:   case T_BOOLEAN:
twisti@2047:   case T_BYTE:
twisti@2047:   case T_CHAR:
twisti@2047:   case T_SHORT:
twisti@2047:   case T_INT:
twisti@2047:     value = SharkValue::jint_constant(constant.as_int());
twisti@2047:     break;
twisti@2047: 
twisti@2047:   case T_LONG:
twisti@2047:     value = SharkValue::jlong_constant(constant.as_long());
twisti@2047:     break;
twisti@2047: 
twisti@2047:   case T_FLOAT:
twisti@2047:     value = SharkValue::jfloat_constant(constant.as_float());
twisti@2047:     break;
twisti@2047: 
twisti@2047:   case T_DOUBLE:
twisti@2047:     value = SharkValue::jdouble_constant(constant.as_double());
twisti@2047:     break;
twisti@2047: 
twisti@2047:   case T_OBJECT:
twisti@2047:   case T_ARRAY:
twisti@2047:     break;
twisti@2047: 
twisti@2047:   case T_ILLEGAL:
twisti@2047:     // out of memory
twisti@2047:     _is_loaded = false;
twisti@2047:     return;
twisti@2047: 
twisti@2047:   default:
twisti@2047:     tty->print_cr("Unhandled type %s", type2name(constant.basic_type()));
twisti@2047:     ShouldNotReachHere();
twisti@2047:   }
twisti@2047: 
twisti@2047:   // Handle primitive types.  We create SharkValues for these
twisti@2047:   // now; doing so doesn't emit any code, and it allows us to
twisti@2047:   // delegate a bunch of stuff to the SharkValue code.
twisti@2047:   if (value) {
twisti@2047:     _value       = value;
twisti@2047:     _is_loaded   = true;
twisti@2047:     _is_nonzero  = value->zero_checked();
twisti@2047:     _is_two_word = value->is_two_word();
twisti@2047:     return;
twisti@2047:   }
twisti@2047: 
twisti@2047:   // Handle reference types.  This is tricky because some
twisti@2047:   // ciObjects are psuedo-objects that refer to oops which
twisti@2047:   // have yet to be created.  We need to spot the unloaded
twisti@2047:   // objects (which differ between ldc* and get*, thanks!)
twisti@2047:   ciObject *object = constant.as_object();
twisti@2047:   assert(type != NULL, "shouldn't be");
twisti@4314: 
twisti@4314:   if ((! object->is_null_object()) && object->klass() == ciEnv::current()->Class_klass()) {
twisti@4314:     ciKlass *klass = object->klass();
twisti@4314:     if (! klass->is_loaded()) {
twisti@2047:       _is_loaded = false;
twisti@2047:       return;
twisti@2047:     }
twisti@2047:   }
twisti@4314: 
twisti@4314:   if (object->is_null_object() || ! object->can_be_constant() || ! object->is_loaded()) {
twisti@2047:     _is_loaded = false;
twisti@2047:     return;
twisti@2047:   }
twisti@2047: 
twisti@2047:   _value       = NULL;
twisti@2047:   _object      = object;
twisti@2047:   _type        = type;
twisti@2047:   _is_loaded   = true;
twisti@2047:   _is_nonzero  = true;
twisti@2047:   _is_two_word = false;
twisti@2047: }