1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "ci/ciSignature.hpp"
  27 #include "ci/ciUtilities.hpp"
  28 #include "memory/allocation.inline.hpp"
  29 #include "oops/oop.inline.hpp"
  30 #include "runtime/signature.hpp"
  31 
  32 // ciSignature
  33 //
  34 // This class represents the signature of a method.
  35 
  36 // ------------------------------------------------------------------
  37 // ciSignature::ciSignature
  38 ciSignature::ciSignature(ciKlass* accessing_klass, ciSymbol* symbol) {
  39   ASSERT_IN_VM;
  40   EXCEPTION_CONTEXT;
  41   _accessing_klass = accessing_klass;
  42   _symbol = symbol;
  43 
  44   ciEnv* env = CURRENT_ENV;
  45   Arena* arena = env->arena();
  46   _types = new (arena) GrowableArray<ciType*>(arena, 8, 0, NULL);
  47 
  48   int size = 0;
  49   int count = 0;
  50   symbolHandle sh (THREAD, symbol->get_symbolOop());
  51   SignatureStream ss(sh);
  52   for (; ; ss.next()) {
  53     // Process one element of the signature
  54     ciType* type;
  55     if (!ss.is_object()) {
  56       type = ciType::make(ss.type());
  57     } else {
  58       symbolOop name = ss.as_symbol(THREAD);
  59       if (HAS_PENDING_EXCEPTION) {
  60         type = ss.is_array() ? (ciType*)ciEnv::unloaded_ciobjarrayklass()
  61           : (ciType*)ciEnv::unloaded_ciinstance_klass();
  62         env->record_out_of_memory_failure();
  63         CLEAR_PENDING_EXCEPTION;
  64       } else {
  65         ciSymbol* klass_name = env->get_object(name)->as_symbol();
  66         type = env->get_klass_by_name_impl(_accessing_klass, klass_name, false);
  67       }
  68     }
  69     _types->append(type);
  70     if (ss.at_return_type()) {
  71       // Done processing the return type; do not add it into the count.
  72       break;
  73     }
  74     size += type->size();
  75     count++;
  76   }
  77   _size = size;
  78   _count = count;
  79 }
  80 
  81 // ------------------------------------------------------------------
  82 // ciSignature::return_ciType
  83 //
  84 // What is the return type of this signature?
  85 ciType* ciSignature::return_type() const {
  86   return _types->at(_count);
  87 }
  88 
  89 // ------------------------------------------------------------------
  90 // ciSignature::ciType_at
  91 //
  92 // What is the type of the index'th element of this
  93 // signature?
  94 ciType* ciSignature::type_at(int index) const {
  95   assert(index < _count, "out of bounds");
  96   // The first _klasses element holds the return klass.
  97   return _types->at(index);
  98 }
  99 
 100 // ------------------------------------------------------------------
 101 // ciSignature::print_signature
 102 void ciSignature::print_signature() {
 103   _symbol->print_symbol();
 104 }
 105 
 106 // ------------------------------------------------------------------
 107 // ciSignature::print
 108 void ciSignature::print() {
 109   tty->print("<ciSignature symbol=");
 110   print_signature();
 111  tty->print(" accessing_klass=");
 112   _accessing_klass->print();
 113   tty->print(" address=0x%x>", (address)this);
 114 }