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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Parser for for .class files
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26 //
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27 // The bytes describing the class file structure is read from a Stream object
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28
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29 class ClassFileParser VALUE_OBJ_CLASS_SPEC {
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30 private:
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31 bool _need_verify;
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32 bool _relax_verify;
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33 u2 _major_version;
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34 u2 _minor_version;
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35 symbolHandle _class_name;
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36
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37 bool _has_finalizer;
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38 bool _has_empty_finalizer;
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39 bool _has_vanilla_constructor;
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40
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41 enum { fixed_buffer_size = 128 };
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42 u_char linenumbertable_buffer[fixed_buffer_size];
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43
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44 ClassFileStream* _stream; // Actual input stream
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45
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46 enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names
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47
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48 // Accessors
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49 ClassFileStream* stream() { return _stream; }
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50 void set_stream(ClassFileStream* st) { _stream = st; }
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51
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52 // Constant pool parsing
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53 void parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS);
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54
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55 constantPoolHandle parse_constant_pool(TRAPS);
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56
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57 // Interface parsing
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58 objArrayHandle parse_interfaces(constantPoolHandle cp,
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59 int length,
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60 Handle class_loader,
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61 Handle protection_domain,
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62 PerfTraceTime* vmtimer,
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63 symbolHandle class_name,
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64 TRAPS);
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65
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66 // Field parsing
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67 void parse_field_attributes(constantPoolHandle cp, u2 attributes_count,
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68 bool is_static, u2 signature_index,
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69 u2* constantvalue_index_addr,
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70 bool* is_synthetic_addr,
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71 u2* generic_signature_index_addr,
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72 typeArrayHandle* field_annotations, TRAPS);
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73 typeArrayHandle parse_fields(constantPoolHandle cp, bool is_interface,
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74 struct FieldAllocationCount *fac,
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75 objArrayHandle* fields_annotations, TRAPS);
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76
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77 // Method parsing
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78 methodHandle parse_method(constantPoolHandle cp, bool is_interface,
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79 AccessFlags* promoted_flags,
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80 typeArrayHandle* method_annotations,
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81 typeArrayHandle* method_parameter_annotations,
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82 typeArrayHandle* method_default_annotations,
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83 TRAPS);
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84 objArrayHandle parse_methods (constantPoolHandle cp, bool is_interface,
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85 AccessFlags* promoted_flags,
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86 bool* has_final_method,
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87 objArrayOop* methods_annotations_oop,
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88 objArrayOop* methods_parameter_annotations_oop,
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89 objArrayOop* methods_default_annotations_oop,
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90 TRAPS);
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91 typeArrayHandle sort_methods (objArrayHandle methods,
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92 objArrayHandle methods_annotations,
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93 objArrayHandle methods_parameter_annotations,
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94 objArrayHandle methods_default_annotations,
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95 TRAPS);
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96 typeArrayHandle parse_exception_table(u4 code_length, u4 exception_table_length,
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97 constantPoolHandle cp, TRAPS);
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98 void parse_linenumber_table(
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99 u4 code_attribute_length, u4 code_length,
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100 CompressedLineNumberWriteStream** write_stream, TRAPS);
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101 u2* parse_localvariable_table(u4 code_length, u2 max_locals, u4 code_attribute_length,
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102 constantPoolHandle cp, u2* localvariable_table_length,
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103 bool isLVTT, TRAPS);
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104 u2* parse_checked_exceptions(u2* checked_exceptions_length, u4 method_attribute_length,
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105 constantPoolHandle cp, TRAPS);
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106 void parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
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107 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS);
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108 typeArrayOop parse_stackmap_table(u4 code_attribute_length, TRAPS);
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109
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110 // Classfile attribute parsing
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111 void parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
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112 void parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
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113 instanceKlassHandle k, int length, TRAPS);
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114 u2 parse_classfile_inner_classes_attribute(constantPoolHandle cp,
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115 instanceKlassHandle k, TRAPS);
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116 void parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
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117 void parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
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118 void parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS);
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119
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120 // Annotations handling
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121 typeArrayHandle assemble_annotations(u1* runtime_visible_annotations,
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122 int runtime_visible_annotations_length,
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123 u1* runtime_invisible_annotations,
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124 int runtime_invisible_annotations_length, TRAPS);
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125
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126 // Final setup
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127 int compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_count,
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128 int first_nonstatic_oop_offset);
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129 void fill_oop_maps(instanceKlassHandle k, int nonstatic_oop_map_count,
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130 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length);
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131 void set_precomputed_flags(instanceKlassHandle k);
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132 objArrayHandle compute_transitive_interfaces(instanceKlassHandle super,
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133 objArrayHandle local_ifs, TRAPS);
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134
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135 // Special handling for certain classes.
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136 // Add the "discovered" field to java.lang.ref.Reference if
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137 // it does not exist.
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138 void java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
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139 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS);
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140 // Adjust the field allocation counts for java.lang.Class to add
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141 // fake fields.
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142 void java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
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143 FieldAllocationCount *fac_ptr, TRAPS);
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144 // Adjust the next_nonstatic_oop_offset to place the fake fields
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145 // before any Java fields.
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146 void java_lang_Class_fix_post(int* next_nonstatic_oop_offset);
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147
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148 // Format checker methods
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149 void classfile_parse_error(const char* msg, TRAPS);
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150 void classfile_parse_error(const char* msg, int index, TRAPS);
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151 void classfile_parse_error(const char* msg, const char *name, TRAPS);
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152 void classfile_parse_error(const char* msg, int index, const char *name, TRAPS);
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153 inline void guarantee_property(bool b, const char* msg, TRAPS) {
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154 if (!b) { classfile_parse_error(msg, CHECK); }
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155 }
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156
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157 inline void assert_property(bool b, const char* msg, TRAPS) {
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158 #ifdef ASSERT
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159 if (!b) { fatal(msg); }
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160 #endif
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161 }
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162
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163 inline void check_property(bool property, const char* msg, int index, TRAPS) {
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164 if (_need_verify) {
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165 guarantee_property(property, msg, index, CHECK);
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166 } else {
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167 assert_property(property, msg, CHECK);
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168 }
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169 }
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170
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171 inline void check_property(bool property, const char* msg, TRAPS) {
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172 if (_need_verify) {
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173 guarantee_property(property, msg, CHECK);
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174 } else {
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175 assert_property(property, msg, CHECK);
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176 }
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177 }
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178
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179 inline void guarantee_property(bool b, const char* msg, int index, TRAPS) {
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180 if (!b) { classfile_parse_error(msg, index, CHECK); }
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181 }
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182 inline void guarantee_property(bool b, const char* msg, const char *name, TRAPS) {
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183 if (!b) { classfile_parse_error(msg, name, CHECK); }
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184 }
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185 inline void guarantee_property(bool b, const char* msg, int index, const char *name, TRAPS) {
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186 if (!b) { classfile_parse_error(msg, index, name, CHECK); }
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187 }
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188
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189 bool is_supported_version(u2 major, u2 minor);
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190 bool has_illegal_visibility(jint flags);
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191
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192 void verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS);
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193 void verify_legal_utf8(const unsigned char* buffer, int length, TRAPS);
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194 void verify_legal_class_name(symbolHandle name, TRAPS);
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195 void verify_legal_field_name(symbolHandle name, TRAPS);
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196 void verify_legal_method_name(symbolHandle name, TRAPS);
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197 void verify_legal_field_signature(symbolHandle fieldname, symbolHandle signature, TRAPS);
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198 int verify_legal_method_signature(symbolHandle methodname, symbolHandle signature, TRAPS);
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199 void verify_legal_class_modifiers(jint flags, TRAPS);
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200 void verify_legal_field_modifiers(jint flags, bool is_interface, TRAPS);
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201 void verify_legal_method_modifiers(jint flags, bool is_interface, symbolHandle name, TRAPS);
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202 bool verify_unqualified_name(char* name, unsigned int length, int type);
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203 char* skip_over_field_name(char* name, bool slash_ok, unsigned int length);
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204 char* skip_over_field_signature(char* signature, bool void_ok, unsigned int length, TRAPS);
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205
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206 public:
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207 // Constructor
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208 ClassFileParser(ClassFileStream* st) { set_stream(st); }
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209
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210 // Parse .class file and return new klassOop. The klassOop is not hooked up
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211 // to the system dictionary or any other structures, so a .class file can
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212 // be loaded several times if desired.
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213 // The system dictionary hookup is done by the caller.
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214 //
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215 // "parsed_name" is updated by this method, and is the name found
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216 // while parsing the stream.
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217 instanceKlassHandle parseClassFile(symbolHandle name,
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218 Handle class_loader,
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219 Handle protection_domain,
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220 symbolHandle& parsed_name,
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221 TRAPS);
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222
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223 // Verifier checks
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224 static void check_super_class_access(instanceKlassHandle this_klass, TRAPS);
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225 static void check_super_interface_access(instanceKlassHandle this_klass, TRAPS);
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226 static void check_final_method_override(instanceKlassHandle this_klass, TRAPS);
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227 static void check_illegal_static_method(instanceKlassHandle this_klass, TRAPS);
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228 };
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