Wed, 17 Jul 2013 18:06:29 -0400
8020309: Eliminate InstanceKlass::_cached_class_file_len.
Summary: Use JvmtiCachedClassFileData.
Reviewed-by: iklam, sspitsyn, dcubed
1 /*
2 * Copyright (c) 2003, 2013, 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.
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23 */
25 #ifndef SHARE_VM_CLASSFILE_STACKMAPFRAME_HPP
26 #define SHARE_VM_CLASSFILE_STACKMAPFRAME_HPP
28 #include "classfile/verificationType.hpp"
29 #include "classfile/verifier.hpp"
30 #include "oops/method.hpp"
31 #include "runtime/handles.hpp"
32 #include "runtime/signature.hpp"
33 #include "utilities/exceptions.hpp"
35 // A StackMapFrame represents one frame in the stack map attribute.
37 class TypeContext;
39 enum {
40 FLAG_THIS_UNINIT = 0x01
41 };
43 class StackMapFrame : public ResourceObj {
44 private:
45 int32_t _offset;
47 // See comment in StackMapTable about _frame_count about why these
48 // fields are int32_t instead of u2.
49 int32_t _locals_size; // number of valid type elements in _locals
50 int32_t _stack_size; // number of valid type elements in _stack
52 int32_t _stack_mark; // Records the size of the stack prior to an
53 // instruction modification, to allow rewinding
54 // when/if an error occurs.
56 int32_t _max_locals;
57 int32_t _max_stack;
59 u1 _flags;
60 VerificationType* _locals; // local variable type array
61 VerificationType* _stack; // operand stack type array
63 ClassVerifier* _verifier; // the verifier verifying this method
65 StackMapFrame(const StackMapFrame& cp) :
66 _offset(cp._offset), _locals_size(cp._locals_size),
67 _stack_size(cp._stack_size), _stack_mark(cp._stack_mark),
68 _max_locals(cp._max_locals), _max_stack(cp._max_stack),
69 _flags(cp._flags) {
70 _locals = NEW_RESOURCE_ARRAY(VerificationType, _max_locals);
71 for (int i = 0; i < _max_locals; ++i) {
72 if (i < _locals_size) {
73 _locals[i] = cp._locals[i];
74 } else {
75 _locals[i] = VerificationType::bogus_type();
76 }
77 }
78 int ss = MAX2(_stack_size, _stack_mark);
79 _stack = NEW_RESOURCE_ARRAY(VerificationType, _max_stack);
80 for (int i = 0; i < _max_stack; ++i) {
81 if (i < ss) {
82 _stack[i] = cp._stack[i];
83 } else {
84 _stack[i] = VerificationType::bogus_type();
85 }
86 }
87 _verifier = NULL;
88 }
90 public:
91 // constructors
93 // This constructor is used by the type checker to allocate frames
94 // in type state, which have _max_locals and _max_stack array elements
95 // in _locals and _stack.
96 StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* verifier);
98 // This constructor is used to initialize stackmap frames in stackmap table,
99 // which have _locals_size and _stack_size array elements in _locals and _stack.
100 StackMapFrame(int32_t offset,
101 u1 flags,
102 u2 locals_size,
103 u2 stack_size,
104 u2 max_locals,
105 u2 max_stack,
106 VerificationType* locals,
107 VerificationType* stack,
108 ClassVerifier* v) : _offset(offset), _flags(flags),
109 _locals_size(locals_size),
110 _stack_size(stack_size),
111 _stack_mark(-1),
112 _max_locals(max_locals),
113 _max_stack(max_stack),
114 _locals(locals), _stack(stack),
115 _verifier(v) { }
117 static StackMapFrame* copy(StackMapFrame* smf) {
118 return new StackMapFrame(*smf);
119 }
121 inline void set_offset(int32_t offset) { _offset = offset; }
122 inline void set_verifier(ClassVerifier* v) { _verifier = v; }
123 inline void set_flags(u1 flags) { _flags = flags; }
124 inline void set_locals_size(u2 locals_size) { _locals_size = locals_size; }
125 inline void set_stack_size(u2 stack_size) { _stack_size = _stack_mark = stack_size; }
126 inline void clear_stack() { _stack_size = 0; }
127 inline int32_t offset() const { return _offset; }
128 inline ClassVerifier* verifier() const { return _verifier; }
129 inline u1 flags() const { return _flags; }
130 inline int32_t locals_size() const { return _locals_size; }
131 inline VerificationType* locals() const { return _locals; }
132 inline int32_t stack_size() const { return _stack_size; }
133 inline VerificationType* stack() const { return _stack; }
134 inline int32_t max_locals() const { return _max_locals; }
135 inline int32_t max_stack() const { return _max_stack; }
136 inline bool flag_this_uninit() const { return _flags & FLAG_THIS_UNINIT; }
138 // Set locals and stack types to bogus
139 inline void reset() {
140 int32_t i;
141 for (i = 0; i < _max_locals; i++) {
142 _locals[i] = VerificationType::bogus_type();
143 }
144 for (i = 0; i < _max_stack; i++) {
145 _stack[i] = VerificationType::bogus_type();
146 }
147 }
149 // Return a StackMapFrame with the same local variable array and empty stack.
150 // Stack array is allocate with unused one element.
151 StackMapFrame* frame_in_exception_handler(u1 flags);
153 // Set local variable type array based on m's signature.
154 VerificationType set_locals_from_arg(
155 const methodHandle m, VerificationType thisKlass, TRAPS);
157 // Search local variable type array and stack type array.
158 // Return true if an uninitialized object is found.
159 bool has_new_object() const;
161 // Search local variable type array and stack type array.
162 // Set every element with type of old_object to new_object.
163 void initialize_object(
164 VerificationType old_object, VerificationType new_object);
166 // Copy local variable type array in src into this local variable type array.
167 void copy_locals(const StackMapFrame* src);
169 // Copy stack type array in src into this stack type array.
170 void copy_stack(const StackMapFrame* src);
172 // Return true if this stack map frame is assignable to target.
173 bool is_assignable_to(
174 const StackMapFrame* target, bool is_exception_handler,
175 ErrorContext* ctx, TRAPS) const;
177 inline void set_mark() {
178 #ifdef ASSERT
179 // Put bogus type to indicate it's no longer valid.
180 if (_stack_mark != -1) {
181 for (int i = _stack_mark - 1; i >= _stack_size; --i) {
182 _stack[i] = VerificationType::bogus_type();
183 }
184 }
185 #endif // def ASSERT
186 _stack_mark = _stack_size;
187 }
189 // Used when an error occurs and we want to reset the stack to the state
190 // it was before operands were popped off.
191 void restore() {
192 if (_stack_mark != -1) {
193 _stack_size = _stack_mark;
194 }
195 }
197 // Push type into stack type array.
198 inline void push_stack(VerificationType type, TRAPS) {
199 assert(!type.is_check(), "Must be a real type");
200 if (_stack_size >= _max_stack) {
201 verifier()->verify_error(
202 ErrorContext::stack_overflow(_offset, this),
203 "Operand stack overflow");
204 return;
205 }
206 _stack[_stack_size++] = type;
207 }
209 inline void push_stack_2(
210 VerificationType type1, VerificationType type2, TRAPS) {
211 assert(type1.is_long() || type1.is_double(), "must be long/double");
212 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2");
213 if (_stack_size >= _max_stack - 1) {
214 verifier()->verify_error(
215 ErrorContext::stack_overflow(_offset, this),
216 "Operand stack overflow");
217 return;
218 }
219 _stack[_stack_size++] = type1;
220 _stack[_stack_size++] = type2;
221 }
223 // Pop and return the top type on stack without verifying.
224 inline VerificationType pop_stack(TRAPS) {
225 if (_stack_size <= 0) {
226 verifier()->verify_error(
227 ErrorContext::stack_underflow(_offset, this),
228 "Operand stack underflow");
229 return VerificationType::bogus_type();
230 }
231 VerificationType top = _stack[--_stack_size];
232 return top;
233 }
235 // Pop and return the top type on stack type array after verifying it
236 // is assignable to type.
237 inline VerificationType pop_stack(VerificationType type, TRAPS) {
238 if (_stack_size != 0) {
239 VerificationType top = _stack[_stack_size - 1];
240 bool subtype = type.is_assignable_from(
241 top, verifier(), CHECK_(VerificationType::bogus_type()));
242 if (subtype) {
243 --_stack_size;
244 return top;
245 }
246 }
247 return pop_stack_ex(type, THREAD);
248 }
250 inline void pop_stack_2(
251 VerificationType type1, VerificationType type2, TRAPS) {
252 assert(type1.is_long2() || type1.is_double2(), "must be long/double");
253 assert(type2.is_long() || type2.is_double(), "must be long/double_2");
254 if (_stack_size >= 2) {
255 VerificationType top1 = _stack[_stack_size - 1];
256 bool subtype1 = type1.is_assignable_from(top1, verifier(), CHECK);
257 VerificationType top2 = _stack[_stack_size - 2];
258 bool subtype2 = type2.is_assignable_from(top2, verifier(), CHECK);
259 if (subtype1 && subtype2) {
260 _stack_size -= 2;
261 return;
262 }
263 }
264 pop_stack_ex(type1, THREAD);
265 pop_stack_ex(type2, THREAD);
266 }
268 VerificationType local_at(int index) {
269 return _locals[index];
270 }
272 VerificationType stack_at(int index) {
273 return _stack[index];
274 }
276 // Uncommon case that throws exceptions.
277 VerificationType pop_stack_ex(VerificationType type, TRAPS);
279 // Return the type at index in local variable array after verifying
280 // it is assignable to type.
281 VerificationType get_local(int32_t index, VerificationType type, TRAPS);
282 // For long/double.
283 void get_local_2(
284 int32_t index, VerificationType type1, VerificationType type2, TRAPS);
286 // Set element at index in local variable array to type.
287 void set_local(int32_t index, VerificationType type, TRAPS);
288 // For long/double.
289 void set_local_2(
290 int32_t index, VerificationType type1, VerificationType type2, TRAPS);
292 // Private auxiliary method used only in is_assignable_to(StackMapFrame).
293 // Returns true if src is assignable to target.
294 int is_assignable_to(
295 VerificationType* src, VerificationType* target, int32_t len, TRAPS) const;
297 bool has_flag_match_exception(const StackMapFrame* target) const;
299 TypeOrigin stack_top_ctx();
301 void print_on(outputStream* str) const;
302 };
304 #endif // SHARE_VM_CLASSFILE_STACKMAPFRAME_HPP