Mercurial > hg > graal-jvmci-8
annotate src/share/vm/classfile/stackMapFrame.cpp @ 2129:8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
Reviewed-by: mchung, acorn
author | kevinw |
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date | Wed, 12 Jan 2011 15:44:16 +0000 |
parents | f95d63e2154a |
children | 3582bf76420e |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/stackMapFrame.hpp" | |
27 #include "classfile/verifier.hpp" | |
28 #include "memory/resourceArea.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "oops/symbolOop.hpp" | |
31 #include "runtime/handles.inline.hpp" | |
32 #include "utilities/globalDefinitions.hpp" | |
0 | 33 |
34 StackMapFrame::StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* v) : | |
35 _offset(0), _locals_size(0), _stack_size(0), _flags(0), | |
36 _max_locals(max_locals), _max_stack(max_stack), | |
37 _verifier(v) { | |
38 Thread* thr = v->thread(); | |
39 _locals = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, max_locals); | |
40 _stack = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, max_stack); | |
41 int32_t i; | |
42 for(i = 0; i < max_locals; i++) { | |
43 _locals[i] = VerificationType::bogus_type(); | |
44 } | |
45 for(i = 0; i < max_stack; i++) { | |
46 _stack[i] = VerificationType::bogus_type(); | |
47 } | |
48 } | |
49 | |
50 StackMapFrame* StackMapFrame::frame_in_exception_handler(u1 flags) { | |
51 Thread* thr = _verifier->thread(); | |
52 VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, 1); | |
53 StackMapFrame* frame = new StackMapFrame(_offset, flags, _locals_size, 0, _max_locals, _max_stack, _locals, stack, _verifier); | |
54 return frame; | |
55 } | |
56 | |
57 bool StackMapFrame::has_new_object() const { | |
58 int32_t i; | |
59 for (i = 0; i < _max_locals; i++) { | |
60 if (_locals[i].is_uninitialized()) { | |
61 return true; | |
62 } | |
63 } | |
64 for (i = 0; i < _stack_size; i++) { | |
65 if (_stack[i].is_uninitialized()) { | |
66 return true; | |
67 } | |
68 } | |
69 return false; | |
70 } | |
71 | |
72 void StackMapFrame::initialize_object( | |
73 VerificationType old_object, VerificationType new_object) { | |
74 int32_t i; | |
75 for (i = 0; i < _max_locals; i++) { | |
76 if (_locals[i].equals(old_object)) { | |
77 _locals[i] = new_object; | |
78 } | |
79 } | |
80 for (i = 0; i < _stack_size; i++) { | |
81 if (_stack[i].equals(old_object)) { | |
82 _stack[i] = new_object; | |
83 } | |
84 } | |
85 if (old_object == VerificationType::uninitialized_this_type()) { | |
86 // "this" has been initialized - reset flags | |
87 _flags = 0; | |
88 } | |
89 } | |
90 | |
91 VerificationType StackMapFrame::set_locals_from_arg( | |
92 const methodHandle m, VerificationType thisKlass, TRAPS) { | |
93 symbolHandle signature(THREAD, m->signature()); | |
94 SignatureStream ss(signature); | |
95 int init_local_num = 0; | |
96 if (!m->is_static()) { | |
97 init_local_num++; | |
98 // add one extra argument for instance method | |
99 if (m->name() == vmSymbols::object_initializer_name() && | |
100 thisKlass.name() != vmSymbols::java_lang_Object()) { | |
101 _locals[0] = VerificationType::uninitialized_this_type(); | |
102 _flags |= FLAG_THIS_UNINIT; | |
103 } else { | |
104 _locals[0] = thisKlass; | |
105 } | |
106 } | |
107 | |
108 // local num may be greater than size of parameters because long/double occupies two slots | |
109 while(!ss.at_return_type()) { | |
110 init_local_num += _verifier->change_sig_to_verificationType( | |
111 &ss, &_locals[init_local_num], | |
112 CHECK_VERIFY_(verifier(), VerificationType::bogus_type())); | |
113 ss.next(); | |
114 } | |
115 _locals_size = init_local_num; | |
116 | |
117 switch (ss.type()) { | |
118 case T_OBJECT: | |
119 case T_ARRAY: | |
120 { | |
121 symbolOop sig = ss.as_symbol(CHECK_(VerificationType::bogus_type())); | |
122 return VerificationType::reference_type(symbolHandle(THREAD, sig)); | |
123 } | |
124 case T_INT: return VerificationType::integer_type(); | |
125 case T_BYTE: return VerificationType::byte_type(); | |
126 case T_CHAR: return VerificationType::char_type(); | |
127 case T_SHORT: return VerificationType::short_type(); | |
128 case T_BOOLEAN: return VerificationType::boolean_type(); | |
129 case T_FLOAT: return VerificationType::float_type(); | |
130 case T_DOUBLE: return VerificationType::double_type(); | |
131 case T_LONG: return VerificationType::long_type(); | |
132 case T_VOID: return VerificationType::bogus_type(); | |
133 default: | |
134 ShouldNotReachHere(); | |
135 } | |
136 return VerificationType::bogus_type(); | |
137 } | |
138 | |
139 void StackMapFrame::copy_locals(const StackMapFrame* src) { | |
140 int32_t len = src->locals_size() < _locals_size ? | |
141 src->locals_size() : _locals_size; | |
142 for (int32_t i = 0; i < len; i++) { | |
143 _locals[i] = src->locals()[i]; | |
144 } | |
145 } | |
146 | |
147 void StackMapFrame::copy_stack(const StackMapFrame* src) { | |
148 int32_t len = src->stack_size() < _stack_size ? | |
149 src->stack_size() : _stack_size; | |
150 for (int32_t i = 0; i < len; i++) { | |
151 _stack[i] = src->stack()[i]; | |
152 } | |
153 } | |
154 | |
155 | |
156 bool StackMapFrame::is_assignable_to( | |
157 VerificationType* from, VerificationType* to, int32_t len, TRAPS) const { | |
158 for (int32_t i = 0; i < len; i++) { | |
159 bool subtype = to[i].is_assignable_from( | |
160 from[i], verifier()->current_class(), THREAD); | |
161 if (!subtype) { | |
162 return false; | |
163 } | |
164 } | |
165 return true; | |
166 } | |
167 | |
168 bool StackMapFrame::is_assignable_to(const StackMapFrame* target, TRAPS) const { | |
169 if (_max_locals != target->max_locals() || _stack_size != target->stack_size()) { | |
170 return false; | |
171 } | |
172 // Only need to compare type elements up to target->locals() or target->stack(). | |
173 // The remaining type elements in this state can be ignored because they are | |
174 // assignable to bogus type. | |
175 bool match_locals = is_assignable_to( | |
176 _locals, target->locals(), target->locals_size(), CHECK_false); | |
177 bool match_stack = is_assignable_to( | |
178 _stack, target->stack(), _stack_size, CHECK_false); | |
179 bool match_flags = (_flags | target->flags()) == target->flags(); | |
180 return (match_locals && match_stack && match_flags); | |
181 } | |
182 | |
183 VerificationType StackMapFrame::pop_stack_ex(VerificationType type, TRAPS) { | |
184 if (_stack_size <= 0) { | |
185 verifier()->verify_error(_offset, "Operand stack underflow"); | |
186 return VerificationType::bogus_type(); | |
187 } | |
188 VerificationType top = _stack[--_stack_size]; | |
189 bool subtype = type.is_assignable_from( | |
190 top, verifier()->current_class(), CHECK_(VerificationType::bogus_type())); | |
191 if (!subtype) { | |
192 verifier()->verify_error(_offset, "Bad type on operand stack"); | |
193 return VerificationType::bogus_type(); | |
194 } | |
195 NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); ) | |
196 return top; | |
197 } | |
198 | |
199 VerificationType StackMapFrame::get_local( | |
200 int32_t index, VerificationType type, TRAPS) { | |
201 if (index >= _max_locals) { | |
202 verifier()->verify_error(_offset, "Local variable table overflow"); | |
203 return VerificationType::bogus_type(); | |
204 } | |
205 bool subtype = type.is_assignable_from(_locals[index], | |
206 verifier()->current_class(), CHECK_(VerificationType::bogus_type())); | |
207 if (!subtype) { | |
208 verifier()->verify_error(_offset, "Bad local variable type"); | |
209 return VerificationType::bogus_type(); | |
210 } | |
211 if(index >= _locals_size) { _locals_size = index + 1; } | |
212 return _locals[index]; | |
213 } | |
214 | |
215 void StackMapFrame::get_local_2( | |
216 int32_t index, VerificationType type1, VerificationType type2, TRAPS) { | |
217 assert(type1.is_long() || type1.is_double(), "must be long/double"); | |
218 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); | |
219 if (index >= _locals_size - 1) { | |
220 verifier()->verify_error(_offset, "get long/double overflows locals"); | |
221 return; | |
222 } | |
223 bool subtype1 = type1.is_assignable_from( | |
224 _locals[index], verifier()->current_class(), CHECK); | |
225 bool subtype2 = type2.is_assignable_from( | |
226 _locals[index+1], verifier()->current_class(), CHECK); | |
227 if (!subtype1 || !subtype2) { | |
228 verifier()->verify_error(_offset, "Bad local variable type"); | |
229 return; | |
230 } | |
231 } | |
232 | |
233 void StackMapFrame::set_local(int32_t index, VerificationType type, TRAPS) { | |
234 assert(!type.is_check(), "Must be a real type"); | |
235 if (index >= _max_locals) { | |
236 verifier()->verify_error("Local variable table overflow", _offset); | |
237 return; | |
238 } | |
239 // If type at index is double or long, set the next location to be unusable | |
240 if (_locals[index].is_double() || _locals[index].is_long()) { | |
241 assert((index + 1) < _locals_size, "Local variable table overflow"); | |
242 _locals[index + 1] = VerificationType::bogus_type(); | |
243 } | |
244 // If type at index is double_2 or long_2, set the previous location to be unusable | |
245 if (_locals[index].is_double2() || _locals[index].is_long2()) { | |
246 assert(index >= 1, "Local variable table underflow"); | |
247 _locals[index - 1] = VerificationType::bogus_type(); | |
248 } | |
249 _locals[index] = type; | |
250 if (index >= _locals_size) { | |
251 #ifdef ASSERT | |
252 for (int i=_locals_size; i<index; i++) { | |
253 assert(_locals[i] == VerificationType::bogus_type(), | |
254 "holes must be bogus type"); | |
255 } | |
256 #endif | |
257 _locals_size = index + 1; | |
258 } | |
259 } | |
260 | |
261 void StackMapFrame::set_local_2( | |
262 int32_t index, VerificationType type1, VerificationType type2, TRAPS) { | |
263 assert(type1.is_long() || type1.is_double(), "must be long/double"); | |
264 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); | |
265 if (index >= _max_locals - 1) { | |
266 verifier()->verify_error("Local variable table overflow", _offset); | |
267 return; | |
268 } | |
269 // If type at index+1 is double or long, set the next location to be unusable | |
270 if (_locals[index+1].is_double() || _locals[index+1].is_long()) { | |
271 assert((index + 2) < _locals_size, "Local variable table overflow"); | |
272 _locals[index + 2] = VerificationType::bogus_type(); | |
273 } | |
274 // If type at index is double_2 or long_2, set the previous location to be unusable | |
275 if (_locals[index].is_double2() || _locals[index].is_long2()) { | |
276 assert(index >= 1, "Local variable table underflow"); | |
277 _locals[index - 1] = VerificationType::bogus_type(); | |
278 } | |
279 _locals[index] = type1; | |
280 _locals[index+1] = type2; | |
281 if (index >= _locals_size - 1) { | |
282 #ifdef ASSERT | |
283 for (int i=_locals_size; i<index; i++) { | |
284 assert(_locals[i] == VerificationType::bogus_type(), | |
285 "holes must be bogus type"); | |
286 } | |
287 #endif | |
288 _locals_size = index + 2; | |
289 } | |
290 } | |
291 | |
292 #ifndef PRODUCT | |
293 | |
294 void StackMapFrame::print() const { | |
295 tty->print_cr("stackmap_frame[%d]:", _offset); | |
296 tty->print_cr("flags = 0x%x", _flags); | |
297 tty->print("locals[%d] = { ", _locals_size); | |
298 for (int32_t i = 0; i < _locals_size; i++) { | |
299 _locals[i].print_on(tty); | |
300 } | |
301 tty->print_cr(" }"); | |
302 tty->print("stack[%d] = { ", _stack_size); | |
303 for (int32_t j = 0; j < _stack_size; j++) { | |
304 _stack[j].print_on(tty); | |
305 } | |
306 tty->print_cr(" }"); | |
307 } | |
308 | |
309 #endif |