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1692
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1 /*
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2009 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #include "incls/_precompiled.incl"
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27 #include "incls/_sharkConstant.cpp.incl"
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28
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29 using namespace llvm;
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30
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31 SharkConstant* SharkConstant::for_ldc(ciBytecodeStream *iter) {
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32 ciConstant constant = iter->get_constant();
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33 ciType *type = NULL;
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34 if (constant.basic_type() == T_OBJECT) {
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35 ciEnv *env = ciEnv::current();
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36 if (constant.as_object()->is_klass())
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37 type = env->Class_klass();
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38 else
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39 type = env->String_klass();
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40 }
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41 return new SharkConstant(constant, type);
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42 }
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43
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44 SharkConstant* SharkConstant::for_field(ciBytecodeStream *iter) {
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45 bool will_link;
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46 ciField *field = iter->get_field(will_link);
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47 assert(will_link, "typeflow responsibility");
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48
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49 return new SharkConstant(field->constant_value(), field->type());
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50 }
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51
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52 SharkConstant::SharkConstant(ciConstant constant, ciType *type) {
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53 SharkValue *value = NULL;
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54
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55 switch (constant.basic_type()) {
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56 case T_BOOLEAN:
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57 case T_BYTE:
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58 case T_CHAR:
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59 case T_SHORT:
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60 case T_INT:
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61 value = SharkValue::jint_constant(constant.as_int());
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62 break;
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63
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64 case T_LONG:
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65 value = SharkValue::jlong_constant(constant.as_long());
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66 break;
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67
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68 case T_FLOAT:
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69 value = SharkValue::jfloat_constant(constant.as_float());
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70 break;
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71
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72 case T_DOUBLE:
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73 value = SharkValue::jdouble_constant(constant.as_double());
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74 break;
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75
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76 case T_OBJECT:
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77 case T_ARRAY:
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78 break;
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79
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80 case T_ILLEGAL:
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81 // out of memory
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82 _is_loaded = false;
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83 return;
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84
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85 default:
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86 tty->print_cr("Unhandled type %s", type2name(constant.basic_type()));
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87 ShouldNotReachHere();
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88 }
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89
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90 // Handle primitive types. We create SharkValues for these
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91 // now; doing so doesn't emit any code, and it allows us to
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92 // delegate a bunch of stuff to the SharkValue code.
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93 if (value) {
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94 _value = value;
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95 _is_loaded = true;
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96 _is_nonzero = value->zero_checked();
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97 _is_two_word = value->is_two_word();
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98 return;
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99 }
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100
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101 // Handle reference types. This is tricky because some
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102 // ciObjects are psuedo-objects that refer to oops which
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103 // have yet to be created. We need to spot the unloaded
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104 // objects (which differ between ldc* and get*, thanks!)
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105 ciObject *object = constant.as_object();
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106 assert(type != NULL, "shouldn't be");
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107 if (object->is_klass()) {
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108 // The constant returned for a klass is the ciKlass
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109 // for the entry, but we want the java_mirror.
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110 ciKlass *klass = object->as_klass();
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111 if (!klass->is_loaded()) {
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112 _is_loaded = false;
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113 return;
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114 }
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115 object = klass->java_mirror();
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116 }
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117 if (object->is_null_object() || !object->can_be_constant()) {
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118 _is_loaded = false;
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119 return;
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120 }
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121
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122 _value = NULL;
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123 _object = object;
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124 _type = type;
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125 _is_loaded = true;
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126 _is_nonzero = true;
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127 _is_two_word = false;
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128 }
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