Tue, 21 Dec 2010 04:37:30 -0800
7008165: Garbage in ClassFormatError message
Summary: When bootstrap_method_ref in BootstrapMethods attribute points to a wrong CP entry (non-MethodHandle), JVM throws ClassFormatError with a message, where method index and class file name is garbage.
Reviewed-by: iveresov
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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).
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23 */
25 #ifndef SHARE_VM_CLASSFILE_VERIFICATIONTYPE_HPP
26 #define SHARE_VM_CLASSFILE_VERIFICATIONTYPE_HPP
28 #include "classfile/systemDictionary.hpp"
29 #include "memory/allocation.hpp"
30 #include "oops/instanceKlass.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "oops/symbolOop.hpp"
33 #include "runtime/handles.hpp"
34 #include "runtime/signature.hpp"
36 enum {
37 // As specifed in the JVM spec
38 ITEM_Top = 0,
39 ITEM_Integer = 1,
40 ITEM_Float = 2,
41 ITEM_Double = 3,
42 ITEM_Long = 4,
43 ITEM_Null = 5,
44 ITEM_UninitializedThis = 6,
45 ITEM_Object = 7,
46 ITEM_Uninitialized = 8,
47 ITEM_Bogus = (uint)-1
48 };
50 class VerificationType VALUE_OBJ_CLASS_SPEC {
51 private:
52 // Least significant bits of _handle are always 0, so we use these as
53 // the indicator that the _handle is valid. Otherwise, the _data field
54 // contains encoded data (as specified below). Should the VM change
55 // and the lower bits on oops aren't 0, the assert in the constructor
56 // will catch this and we'll have to add a descriminator tag to this
57 // structure.
58 union {
59 symbolOop* _handle;
60 uintptr_t _data;
61 } _u;
63 enum {
64 // These rest are not found in classfiles, but used by the verifier
65 ITEM_Boolean = 9, ITEM_Byte, ITEM_Short, ITEM_Char,
66 ITEM_Long_2nd, ITEM_Double_2nd
67 };
69 // Enum for the _data field
70 enum {
71 // Bottom two bits determine if the type is a reference, primitive,
72 // uninitialized or a query-type.
73 TypeMask = 0x00000003,
75 // Topmost types encoding
76 Reference = 0x0, // _handle contains the name
77 Primitive = 0x1, // see below for primitive list
78 Uninitialized = 0x2, // 0x00ffff00 contains bci
79 TypeQuery = 0x3, // Meta-types used for category testing
81 // Utility flags
82 ReferenceFlag = 0x00, // For reference query types
83 Category1Flag = 0x01, // One-word values
84 Category2Flag = 0x02, // First word of a two-word value
85 Category2_2ndFlag = 0x04, // Second word of a two-word value
87 // special reference values
88 Null = 0x00000000, // A reference with a 0 handle is null
90 // Primitives categories (the second byte determines the category)
91 Category1 = (Category1Flag << 1 * BitsPerByte) | Primitive,
92 Category2 = (Category2Flag << 1 * BitsPerByte) | Primitive,
93 Category2_2nd = (Category2_2ndFlag << 1 * BitsPerByte) | Primitive,
95 // Primitive values (type descriminator stored in most-signifcant bytes)
96 Bogus = (ITEM_Bogus << 2 * BitsPerByte) | Category1,
97 Boolean = (ITEM_Boolean << 2 * BitsPerByte) | Category1,
98 Byte = (ITEM_Byte << 2 * BitsPerByte) | Category1,
99 Short = (ITEM_Short << 2 * BitsPerByte) | Category1,
100 Char = (ITEM_Char << 2 * BitsPerByte) | Category1,
101 Integer = (ITEM_Integer << 2 * BitsPerByte) | Category1,
102 Float = (ITEM_Float << 2 * BitsPerByte) | Category1,
103 Long = (ITEM_Long << 2 * BitsPerByte) | Category2,
104 Double = (ITEM_Double << 2 * BitsPerByte) | Category2,
105 Long_2nd = (ITEM_Long_2nd << 2 * BitsPerByte) | Category2_2nd,
106 Double_2nd = (ITEM_Double_2nd << 2 * BitsPerByte) | Category2_2nd,
108 // Used by Uninitialized (second and third bytes hold the bci)
109 BciMask = 0xffff << 1 * BitsPerByte,
110 BciForThis = ((u2)-1), // A bci of -1 is an Unintialized-This
112 // Query values
113 ReferenceQuery = (ReferenceFlag << 1 * BitsPerByte) | TypeQuery,
114 Category1Query = (Category1Flag << 1 * BitsPerByte) | TypeQuery,
115 Category2Query = (Category2Flag << 1 * BitsPerByte) | TypeQuery,
116 Category2_2ndQuery = (Category2_2ndFlag << 1 * BitsPerByte) | TypeQuery
117 };
119 VerificationType(uintptr_t raw_data) {
120 _u._data = raw_data;
121 }
123 public:
125 VerificationType() { *this = bogus_type(); }
127 // Create verification types
128 static VerificationType bogus_type() { return VerificationType(Bogus); }
129 static VerificationType null_type() { return VerificationType(Null); }
130 static VerificationType integer_type() { return VerificationType(Integer); }
131 static VerificationType float_type() { return VerificationType(Float); }
132 static VerificationType long_type() { return VerificationType(Long); }
133 static VerificationType long2_type() { return VerificationType(Long_2nd); }
134 static VerificationType double_type() { return VerificationType(Double); }
135 static VerificationType boolean_type() { return VerificationType(Boolean); }
136 static VerificationType byte_type() { return VerificationType(Byte); }
137 static VerificationType char_type() { return VerificationType(Char); }
138 static VerificationType short_type() { return VerificationType(Short); }
139 static VerificationType double2_type()
140 { return VerificationType(Double_2nd); }
142 // "check" types are used for queries. A "check" type is not assignable
143 // to anything, but the specified types are assignable to a "check". For
144 // example, any category1 primitive is assignable to category1_check and
145 // any reference is assignable to reference_check.
146 static VerificationType reference_check()
147 { return VerificationType(ReferenceQuery); }
148 static VerificationType category1_check()
149 { return VerificationType(Category1Query); }
150 static VerificationType category2_check()
151 { return VerificationType(Category2Query); }
152 static VerificationType category2_2nd_check()
153 { return VerificationType(Category2_2ndQuery); }
155 // For reference types, store the actual oop* handle
156 static VerificationType reference_type(symbolHandle sh) {
157 assert(((uintptr_t)sh.raw_value() & 0x3) == 0, "Oops must be aligned");
158 // If the above assert fails in the future because oop* isn't aligned,
159 // then this type encoding system will have to change to have a tag value
160 // to descriminate between oops and primitives.
161 return VerificationType((uintptr_t)((symbolOop*)sh.raw_value()));
162 }
163 static VerificationType reference_type(symbolOop s, TRAPS)
164 { return reference_type(symbolHandle(THREAD, s)); }
166 static VerificationType uninitialized_type(u2 bci)
167 { return VerificationType(bci << 1 * BitsPerByte | Uninitialized); }
168 static VerificationType uninitialized_this_type()
169 { return uninitialized_type(BciForThis); }
171 // Create based on u1 read from classfile
172 static VerificationType from_tag(u1 tag);
174 bool is_bogus() const { return (_u._data == Bogus); }
175 bool is_null() const { return (_u._data == Null); }
176 bool is_boolean() const { return (_u._data == Boolean); }
177 bool is_byte() const { return (_u._data == Byte); }
178 bool is_char() const { return (_u._data == Char); }
179 bool is_short() const { return (_u._data == Short); }
180 bool is_integer() const { return (_u._data == Integer); }
181 bool is_long() const { return (_u._data == Long); }
182 bool is_float() const { return (_u._data == Float); }
183 bool is_double() const { return (_u._data == Double); }
184 bool is_long2() const { return (_u._data == Long_2nd); }
185 bool is_double2() const { return (_u._data == Double_2nd); }
186 bool is_reference() const { return ((_u._data & TypeMask) == Reference); }
187 bool is_category1() const {
188 // This should return true for all one-word types, which are category1
189 // primitives, and references (including uninitialized refs). Though
190 // the 'query' types should technically return 'false' here, if we
191 // allow this to return true, we can perform the test using only
192 // 2 operations rather than 8 (3 masks, 3 compares and 2 logical 'ands').
193 // Since noone should call this on a query type anyway, this is ok.
194 assert(!is_check(), "Must not be a check type (wrong value returned)");
195 return ((_u._data & Category1) != Primitive);
196 // should only return false if it's a primitive, and the category1 flag
197 // is not set.
198 }
199 bool is_category2() const { return ((_u._data & Category2) == Category2); }
200 bool is_category2_2nd() const {
201 return ((_u._data & Category2_2nd) == Category2_2nd);
202 }
203 bool is_reference_check() const { return _u._data == ReferenceQuery; }
204 bool is_category1_check() const { return _u._data == Category1Query; }
205 bool is_category2_check() const { return _u._data == Category2Query; }
206 bool is_category2_2nd_check() const { return _u._data == Category2_2ndQuery; }
207 bool is_check() const { return (_u._data & TypeQuery) == TypeQuery; }
209 bool is_x_array(char sig) const {
210 return is_null() || (is_array() && (name()->byte_at(1) == sig));
211 }
212 bool is_int_array() const { return is_x_array('I'); }
213 bool is_byte_array() const { return is_x_array('B'); }
214 bool is_bool_array() const { return is_x_array('Z'); }
215 bool is_char_array() const { return is_x_array('C'); }
216 bool is_short_array() const { return is_x_array('S'); }
217 bool is_long_array() const { return is_x_array('J'); }
218 bool is_float_array() const { return is_x_array('F'); }
219 bool is_double_array() const { return is_x_array('D'); }
220 bool is_object_array() const { return is_x_array('L'); }
221 bool is_array_array() const { return is_x_array('['); }
222 bool is_reference_array() const
223 { return is_object_array() || is_array_array(); }
224 bool is_object() const
225 { return (is_reference() && !is_null() && name()->utf8_length() >= 1 &&
226 name()->byte_at(0) != '['); }
227 bool is_array() const
228 { return (is_reference() && !is_null() && name()->utf8_length() >= 2 &&
229 name()->byte_at(0) == '['); }
230 bool is_uninitialized() const
231 { return ((_u._data & Uninitialized) == Uninitialized); }
232 bool is_uninitialized_this() const
233 { return is_uninitialized() && bci() == BciForThis; }
235 VerificationType to_category2_2nd() const {
236 assert(is_category2(), "Must be a double word");
237 return VerificationType(is_long() ? Long_2nd : Double_2nd);
238 }
240 u2 bci() const {
241 assert(is_uninitialized(), "Must be uninitialized type");
242 return ((_u._data & BciMask) >> 1 * BitsPerByte);
243 }
245 symbolHandle name_handle() const {
246 assert(is_reference() && !is_null(), "Must be a non-null reference");
247 return symbolHandle(_u._handle, true);
248 }
249 symbolOop name() const {
250 assert(is_reference() && !is_null(), "Must be a non-null reference");
251 return *(_u._handle);
252 }
254 bool equals(const VerificationType& t) const {
255 return (_u._data == t._u._data ||
256 (is_reference() && t.is_reference() && !is_null() && !t.is_null() &&
257 name() == t.name()));
258 }
260 bool operator ==(const VerificationType& t) const {
261 return equals(t);
262 }
264 bool operator !=(const VerificationType& t) const {
265 return !equals(t);
266 }
268 // The whole point of this type system - check to see if one type
269 // is assignable to another. Returns true if one can assign 'from' to
270 // this.
271 bool is_assignable_from(
272 const VerificationType& from, instanceKlassHandle context, TRAPS) const {
273 if (equals(from) || is_bogus()) {
274 return true;
275 } else {
276 switch(_u._data) {
277 case Category1Query:
278 return from.is_category1();
279 case Category2Query:
280 return from.is_category2();
281 case Category2_2ndQuery:
282 return from.is_category2_2nd();
283 case ReferenceQuery:
284 return from.is_reference() || from.is_uninitialized();
285 case Boolean:
286 case Byte:
287 case Char:
288 case Short:
289 // An int can be assigned to boolean, byte, char or short values.
290 return from.is_integer();
291 default:
292 if (is_reference() && from.is_reference()) {
293 return is_reference_assignable_from(from, context, CHECK_false);
294 } else {
295 return false;
296 }
297 }
298 }
299 }
301 VerificationType get_component(TRAPS) const;
303 int dimensions() const {
304 assert(is_array(), "Must be an array");
305 int index = 0;
306 while (name()->byte_at(index++) == '[');
307 return index;
308 }
310 void print_on(outputStream* st) const PRODUCT_RETURN;
312 private:
314 bool is_reference_assignable_from(
315 const VerificationType&, instanceKlassHandle, TRAPS) const;
316 };
318 #endif // SHARE_VM_CLASSFILE_VERIFICATIONTYPE_HPP