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6934
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_CLASSFILE_GENERICSIGNATURES_HPP
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26 #define SHARE_VM_CLASSFILE_GENERICSIGNATURES_HPP
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27
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28 #include "classfile/symbolTable.hpp"
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29 #include "memory/allocation.hpp"
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30 #include "runtime/signature.hpp"
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31 #include "utilities/growableArray.hpp"
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32 #include "utilities/resourceHash.hpp"
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33
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34 class stringStream;
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35
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36 namespace generic {
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37
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38 class Identifier;
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39 class ClassDescriptor;
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40 class MethodDescriptor;
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41
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42 class TypeParameter; // a formal type parameter declared in generic signatures
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43 class TypeArgument; // The "type value" passed to fill parameters in supertypes
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44 class TypeVariable; // A usage of a type parameter as a value
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45 /**
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46 * Example:
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47 *
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48 * <T, V> class Foo extends Bar<String> { int m(V v) {} }
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49 * ^^^^^^ ^^^^^^ ^^
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50 * type parameters type argument type variable
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51 *
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52 * Note that a type variable could be passed as an argument too:
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53 * <T, V> class Foo extends Bar<T> { int m(V v) {} }
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54 * ^^^
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55 * type argument's value is a type variable
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56 */
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57
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58
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59 class Type;
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60 class ClassType;
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61 class ArrayType;
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62 class PrimitiveType;
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63 class Context;
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64 class DescriptorCache;
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65
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66 class DescriptorStream;
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67
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68 class Identifier : public ResourceObj {
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69 private:
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70 Symbol* _sym;
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71 int _begin;
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72 int _end;
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73
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74 public:
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75 Identifier(Symbol* sym, int begin, int end) :
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76 _sym(sym), _begin(begin), _end(end) {}
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77
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78 bool equals(Identifier* other);
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79 bool equals(Symbol* sym);
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80
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81 #ifndef PRODUCT
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82 void print_on(outputStream* str) const;
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83 #endif // ndef PRODUCT
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84 };
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85
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86 class Descriptor : public ResourceObj {
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87 protected:
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88 GrowableArray<TypeParameter*> _type_parameters;
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89 ClassDescriptor* _outer_class;
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90
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91 Descriptor(GrowableArray<TypeParameter*>& params,
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92 ClassDescriptor* outer)
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93 : _type_parameters(params), _outer_class(outer) {}
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94
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95 public:
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96
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97 ClassDescriptor* outer_class() { return _outer_class; }
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98 void set_outer_class(ClassDescriptor* sig) { _outer_class = sig; }
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99
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100 virtual ClassDescriptor* as_class_signature() { return NULL; }
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101 virtual MethodDescriptor* as_method_signature() { return NULL; }
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102
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103 bool is_class_signature() { return as_class_signature() != NULL; }
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104 bool is_method_signature() { return as_method_signature() != NULL; }
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105
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106 GrowableArray<TypeParameter*>& type_parameters() {
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107 return _type_parameters;
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108 }
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109
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110 TypeParameter* find_type_parameter(Identifier* id, int* param_depth);
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111
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112 virtual void bind_variables_to_parameters() = 0;
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113
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114 #ifndef PRODUCT
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115 virtual void print_on(outputStream* str) const = 0;
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116 #endif
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117 };
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118
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119 class ClassDescriptor : public Descriptor {
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120 private:
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121 ClassType* _super;
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122 GrowableArray<ClassType*> _interfaces;
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123 MethodDescriptor* _outer_method;
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124
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125 ClassDescriptor(GrowableArray<TypeParameter*>& ftp, ClassType* scs,
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126 GrowableArray<ClassType*>& sis, ClassDescriptor* outer_class = NULL,
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127 MethodDescriptor* outer_method = NULL)
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128 : Descriptor(ftp, outer_class), _super(scs), _interfaces(sis),
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129 _outer_method(outer_method) {}
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130
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131 static u2 get_outer_class_index(InstanceKlass* k, TRAPS);
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132 static ClassDescriptor* parse_generic_signature(Klass* k, Symbol* original_name, TRAPS);
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133
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134 public:
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135
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136 virtual ClassDescriptor* as_class_signature() { return this; }
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137
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138 MethodDescriptor* outer_method() { return _outer_method; }
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139 void set_outer_method(MethodDescriptor* m) { _outer_method = m; }
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140
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141 ClassType* super() { return _super; }
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142 ClassType* interface_desc(Symbol* sym);
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143
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144 static ClassDescriptor* parse_generic_signature(Klass* k, TRAPS);
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145 static ClassDescriptor* parse_generic_signature(Symbol* sym);
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146
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147 // For use in superclass chains in positions where this is no generic info
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148 static ClassDescriptor* placeholder(InstanceKlass* klass);
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149
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150 #ifndef PRODUCT
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151 void print_on(outputStream* str) const;
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152 #endif
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153
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154 ClassDescriptor* canonicalize(Context* ctx);
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155
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156 // Linking sets the position index in any contained TypeVariable type
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157 // to correspond to the location of that identifier in the formal type
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158 // parameters.
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159 void bind_variables_to_parameters();
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160 };
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161
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162 class MethodDescriptor : public Descriptor {
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163 private:
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164 GrowableArray<Type*> _parameters;
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165 Type* _return_type;
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166 GrowableArray<Type*> _throws;
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167
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168 MethodDescriptor(GrowableArray<TypeParameter*>& ftp, ClassDescriptor* outer,
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169 GrowableArray<Type*>& sigs, Type* rt, GrowableArray<Type*>& throws)
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170 : Descriptor(ftp, outer), _parameters(sigs), _return_type(rt),
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171 _throws(throws) {}
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172
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173 public:
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174
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175 static MethodDescriptor* parse_generic_signature(Method* m, ClassDescriptor* outer);
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176 static MethodDescriptor* parse_generic_signature(Symbol* sym, ClassDescriptor* outer);
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177
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178 MethodDescriptor* as_method_signature() { return this; }
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179
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180 // Performs generic analysis on the method parameters to determine
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181 // if both methods refer to the same argument types.
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182 bool covariant_match(MethodDescriptor* other, Context* ctx);
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183
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184 // Returns a new method descriptor with all generic variables
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185 // removed and replaced with whatever is indicated using the Context.
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186 MethodDescriptor* canonicalize(Context* ctx);
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187
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188 void bind_variables_to_parameters();
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189
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190 #ifndef PRODUCT
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191 TempNewSymbol reify_signature(Context* ctx, TRAPS);
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192 void print_on(outputStream* str) const;
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193 #endif
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194 };
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195
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196 class TypeParameter : public ResourceObj {
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197 private:
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198 Identifier* _identifier;
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199 ClassType* _class_bound;
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200 GrowableArray<ClassType*> _interface_bounds;
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201
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202 // The position is the ordinal location of the parameter within the
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203 // formal parameter list (excluding outer classes). It is only set for
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204 // formal type parameters that are associated with a class -- method
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205 // type parameters are left as -1. When resolving a generic variable to
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206 // find the actual type, this index is used to access the generic type
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207 // argument in the provided context object.
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208 int _position; // Assigned during variable linking
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209
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210 TypeParameter(Identifier* id, ClassType* class_bound,
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211 GrowableArray<ClassType*>& interface_bounds) :
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212 _identifier(id), _class_bound(class_bound),
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213 _interface_bounds(interface_bounds), _position(-1) {}
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214
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215 public:
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216 static TypeParameter* parse_generic_signature(DescriptorStream* str);
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217
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218 ClassType* bound();
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219 int position() { return _position; }
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220
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221 void bind_variables_to_parameters(Descriptor* sig, int position);
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222 Identifier* identifier() { return _identifier; }
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223
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224 Type* resolve(Context* ctx, int inner_depth, int ctx_depth);
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225 TypeParameter* canonicalize(Context* ctx, int ctx_depth);
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226
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227 #ifndef PRODUCT
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228 void print_on(outputStream* str) const;
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229 #endif
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230 };
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231
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232 class Type : public ResourceObj {
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233 public:
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234 static Type* parse_generic_signature(DescriptorStream* str);
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235
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236 virtual ClassType* as_class() { return NULL; }
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237 virtual TypeVariable* as_variable() { return NULL; }
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238 virtual ArrayType* as_array() { return NULL; }
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239 virtual PrimitiveType* as_primitive() { return NULL; }
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240
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241 virtual bool covariant_match(Type* gt, Context* ctx) = 0;
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242 virtual Type* canonicalize(Context* ctx, int ctx_depth) = 0;
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243
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244 virtual void bind_variables_to_parameters(Descriptor* sig) = 0;
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245
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246 #ifndef PRODUCT
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247 virtual void reify_signature(stringStream* ss, Context* ctx) = 0;
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248 virtual void print_on(outputStream* str) const = 0;
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249 #endif
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250 };
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251
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252 class ClassType : public Type {
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253 friend class ClassDescriptor;
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254 protected:
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255 Identifier* _identifier;
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256 GrowableArray<TypeArgument*> _type_arguments;
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257 ClassType* _outer_class;
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258
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259 ClassType(Identifier* identifier,
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260 GrowableArray<TypeArgument*>& args,
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261 ClassType* outer)
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262 : _identifier(identifier), _type_arguments(args), _outer_class(outer) {}
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263
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264 // Returns true if there are inner classes to read
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265 static Identifier* parse_generic_signature_simple(
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266 GrowableArray<TypeArgument*>* args,
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267 bool* has_inner, DescriptorStream* str);
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268
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269 static ClassType* parse_generic_signature(ClassType* outer,
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270 DescriptorStream* str);
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271 static ClassType* from_symbol(Symbol* sym);
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272
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273 public:
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274 ClassType* as_class() { return this; }
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275
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276 static ClassType* parse_generic_signature(DescriptorStream* str);
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277 static ClassType* java_lang_Object();
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278
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279 Identifier* identifier() { return _identifier; }
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280 int type_arguments_length() { return _type_arguments.length(); }
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281 TypeArgument* type_argument_at(int i);
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282
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283 virtual ClassType* outer_class() { return _outer_class; }
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284
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285 bool covariant_match(Type* gt, Context* ctx);
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286 ClassType* canonicalize(Context* ctx, int context_depth);
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287
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288 void bind_variables_to_parameters(Descriptor* sig);
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289
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290 #ifndef PRODUCT
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291 void reify_signature(stringStream* ss, Context* ctx);
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292 void print_on(outputStream* str) const;
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293 #endif
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294 };
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295
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296 class TypeVariable : public Type {
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297 private:
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298 Identifier* _id;
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299 TypeParameter* _parameter; // assigned during linking
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300
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301 // how many steps "out" from inner classes, -1 if method
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302 int _inner_depth;
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303
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304 TypeVariable(Identifier* id)
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305 : _id(id), _parameter(NULL), _inner_depth(0) {}
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306
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307 public:
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308 TypeVariable* as_variable() { return this; }
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309
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310 static TypeVariable* parse_generic_signature(DescriptorStream* str);
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311
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312 Identifier* identifier() { return _id; }
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313 TypeParameter* parameter() { return _parameter; }
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314 int inner_depth() { return _inner_depth; }
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315
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316 void bind_variables_to_parameters(Descriptor* sig);
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317
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318 Type* resolve(Context* ctx, int ctx_depth);
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319 bool covariant_match(Type* gt, Context* ctx);
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320 Type* canonicalize(Context* ctx, int ctx_depth);
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321
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322 #ifndef PRODUCT
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323 void reify_signature(stringStream* ss, Context* ctx);
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324 void print_on(outputStream* str) const;
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325 #endif
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326 };
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327
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328 class ArrayType : public Type {
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329 private:
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330 Type* _base;
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331
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332 ArrayType(Type* base) : _base(base) {}
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333
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334 public:
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335 ArrayType* as_array() { return this; }
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336
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337 static ArrayType* parse_generic_signature(DescriptorStream* str);
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338
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339 bool covariant_match(Type* gt, Context* ctx);
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340 ArrayType* canonicalize(Context* ctx, int ctx_depth);
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341
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342 void bind_variables_to_parameters(Descriptor* sig);
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343
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344 #ifndef PRODUCT
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345 void reify_signature(stringStream* ss, Context* ctx);
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346 void print_on(outputStream* str) const;
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347 #endif
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348 };
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349
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350 class PrimitiveType : public Type {
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351 friend class Type;
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352 private:
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353 char _type; // includes V for void
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354
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355 PrimitiveType(char& type) : _type(type) {}
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356
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357 public:
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358 PrimitiveType* as_primitive() { return this; }
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359
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360 bool covariant_match(Type* gt, Context* ctx);
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361 PrimitiveType* canonicalize(Context* ctx, int ctx_depth);
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362
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363 void bind_variables_to_parameters(Descriptor* sig);
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364
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365 #ifndef PRODUCT
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366 void reify_signature(stringStream* ss, Context* ctx);
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367 void print_on(outputStream* str) const;
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368 #endif
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369 };
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370
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371 class TypeArgument : public ResourceObj {
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372 private:
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373 Type* _lower_bound;
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374 Type* _upper_bound; // may be null or == _lower_bound
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375
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376 TypeArgument(Type* lower_bound, Type* upper_bound)
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377 : _lower_bound(lower_bound), _upper_bound(upper_bound) {}
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378
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379 public:
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380
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381 static TypeArgument* parse_generic_signature(DescriptorStream* str);
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382
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383 Type* lower_bound() { return _lower_bound; }
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384 Type* upper_bound() { return _upper_bound; }
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385
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386 void bind_variables_to_parameters(Descriptor* sig);
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387 TypeArgument* canonicalize(Context* ctx, int ctx_depth);
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388
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389 bool covariant_match(TypeArgument* a, Context* ctx);
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390
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391 #ifndef PRODUCT
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392 void print_on(outputStream* str) const;
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393 #endif
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394 };
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395
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396
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397 class Context : public ResourceObj {
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398 private:
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399 DescriptorCache* _cache;
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400 GrowableArray<ClassType*> _type_arguments;
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401
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402 void reset_to_mark(int size);
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403
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404 public:
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405 // When this object goes out of scope or 'destroy' is
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406 // called, then the application of the type to the
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407 // context is wound-back (unless it's been deactivated).
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408 class Mark : public StackObj {
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409 private:
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410 mutable Context* _context;
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411 int _marked_size;
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412
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413 bool is_active() const { return _context != NULL; }
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414 void deactivate() const { _context = NULL; }
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415
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416 public:
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417 Mark() : _context(NULL), _marked_size(0) {}
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418 Mark(Context* ctx, int sz) : _context(ctx), _marked_size(sz) {}
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419 Mark(const Mark& m) : _context(m._context), _marked_size(m._marked_size) {
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420 m.deactivate(); // Ownership is transferred
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421 }
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422
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423 Mark& operator=(const Mark& cm) {
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424 destroy();
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425 _context = cm._context;
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426 _marked_size = cm._marked_size;
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427 cm.deactivate();
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428 return *this;
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429 }
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430
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431 void destroy();
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432 ~Mark() { destroy(); }
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433 };
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434
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435 Context(DescriptorCache* cache) : _cache(cache) {}
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436
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437 Mark mark() { return Mark(this, _type_arguments.length()); }
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438 void apply_type_arguments(InstanceKlass* current, InstanceKlass* super,TRAPS);
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439
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440 ClassType* at_depth(int i) const;
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441
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442 #ifndef PRODUCT
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443 void print_on(outputStream* str) const;
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444 #endif
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445 };
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446
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447 /**
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448 * Contains a cache of descriptors for classes and methods so they can be
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449 * looked-up instead of reparsing each time they are needed.
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450 */
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451 class DescriptorCache : public ResourceObj {
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452 private:
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453 ResourceHashtable<InstanceKlass*, ClassDescriptor*> _class_descriptors;
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454 ResourceHashtable<Method*, MethodDescriptor*> _method_descriptors;
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455
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456 public:
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457 ClassDescriptor* descriptor_for(InstanceKlass* ikh, TRAPS);
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458
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459 MethodDescriptor* descriptor_for(Method* mh, ClassDescriptor* cd, TRAPS);
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460 // Class descriptor derived from method holder
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461 MethodDescriptor* descriptor_for(Method* mh, TRAPS);
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462 };
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463
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464 } // namespace generic
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465
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466 #endif // SHARE_VM_CLASSFILE_GENERICSIGNATURES_HPP
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467
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