Mercurial > hg > truffle
annotate src/share/vm/classfile/stackMapFrame.cpp @ 5073:2db1ad9dd385
rename PiNode.value to PiNode.object and UnsafeCastNode.x to UnsafeCastNode.object
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 14 Mar 2012 16:57:18 +0100 |
parents | 3449f5e02cc4 |
children | 4ee06e614636 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, 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 * | |
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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" | |
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30 #include "oops/symbol.hpp" |
1972 | 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) { | |
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93 SignatureStream ss(m->signature()); |
0 | 94 int init_local_num = 0; |
95 if (!m->is_static()) { | |
96 init_local_num++; | |
97 // add one extra argument for instance method | |
98 if (m->name() == vmSymbols::object_initializer_name() && | |
99 thisKlass.name() != vmSymbols::java_lang_Object()) { | |
100 _locals[0] = VerificationType::uninitialized_this_type(); | |
101 _flags |= FLAG_THIS_UNINIT; | |
102 } else { | |
103 _locals[0] = thisKlass; | |
104 } | |
105 } | |
106 | |
107 // local num may be greater than size of parameters because long/double occupies two slots | |
108 while(!ss.at_return_type()) { | |
109 init_local_num += _verifier->change_sig_to_verificationType( | |
110 &ss, &_locals[init_local_num], | |
111 CHECK_VERIFY_(verifier(), VerificationType::bogus_type())); | |
112 ss.next(); | |
113 } | |
114 _locals_size = init_local_num; | |
115 | |
116 switch (ss.type()) { | |
117 case T_OBJECT: | |
118 case T_ARRAY: | |
119 { | |
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120 Symbol* sig = ss.as_symbol(CHECK_(VerificationType::bogus_type())); |
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121 // Create another symbol to save as signature stream unreferences |
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122 // this symbol. |
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123 Symbol* sig_copy = |
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124 verifier()->create_temporary_symbol(sig, 0, sig->utf8_length(), |
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125 CHECK_(VerificationType::bogus_type())); |
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126 assert(sig_copy == sig, "symbols don't match"); |
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127 return VerificationType::reference_type(sig_copy); |
0 | 128 } |
129 case T_INT: return VerificationType::integer_type(); | |
130 case T_BYTE: return VerificationType::byte_type(); | |
131 case T_CHAR: return VerificationType::char_type(); | |
132 case T_SHORT: return VerificationType::short_type(); | |
133 case T_BOOLEAN: return VerificationType::boolean_type(); | |
134 case T_FLOAT: return VerificationType::float_type(); | |
135 case T_DOUBLE: return VerificationType::double_type(); | |
136 case T_LONG: return VerificationType::long_type(); | |
137 case T_VOID: return VerificationType::bogus_type(); | |
138 default: | |
139 ShouldNotReachHere(); | |
140 } | |
141 return VerificationType::bogus_type(); | |
142 } | |
143 | |
144 void StackMapFrame::copy_locals(const StackMapFrame* src) { | |
145 int32_t len = src->locals_size() < _locals_size ? | |
146 src->locals_size() : _locals_size; | |
147 for (int32_t i = 0; i < len; i++) { | |
148 _locals[i] = src->locals()[i]; | |
149 } | |
150 } | |
151 | |
152 void StackMapFrame::copy_stack(const StackMapFrame* src) { | |
153 int32_t len = src->stack_size() < _stack_size ? | |
154 src->stack_size() : _stack_size; | |
155 for (int32_t i = 0; i < len; i++) { | |
156 _stack[i] = src->stack()[i]; | |
157 } | |
158 } | |
159 | |
160 | |
161 bool StackMapFrame::is_assignable_to( | |
162 VerificationType* from, VerificationType* to, int32_t len, TRAPS) const { | |
163 for (int32_t i = 0; i < len; i++) { | |
164 bool subtype = to[i].is_assignable_from( | |
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165 from[i], verifier(), THREAD); |
0 | 166 if (!subtype) { |
167 return false; | |
168 } | |
169 } | |
170 return true; | |
171 } | |
172 | |
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173 bool StackMapFrame::has_flag_match_exception( |
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174 const StackMapFrame* target) const { |
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175 // We allow flags of {UninitThis} to assign to {} if-and-only-if the |
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176 // target frame does not depend upon the current type. |
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177 // This is slightly too strict, as we need only enforce that the |
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178 // slots that were initialized by the <init> (the things that were |
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179 // UninitializedThis before initialize_object() converted them) are unused. |
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180 // However we didn't save that information so we'll enforce this upon |
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181 // anything that might have been initialized. This is a rare situation |
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182 // and javac never generates code that would end up here, but some profilers |
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183 // (such as NetBeans) might, when adding exception handlers in <init> |
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184 // methods to cover the invokespecial instruction. See 7020118. |
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185 |
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186 assert(max_locals() == target->max_locals() && |
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187 stack_size() == target->stack_size(), "StackMap sizes must match"); |
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188 |
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189 VerificationType top = VerificationType::top_type(); |
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190 VerificationType this_type = verifier()->current_type(); |
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191 |
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192 if (!flag_this_uninit() || target->flags() != 0) { |
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193 return false; |
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194 } |
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195 |
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196 for (int i = 0; i < target->locals_size(); ++i) { |
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197 if (locals()[i] == this_type && target->locals()[i] != top) { |
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198 return false; |
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199 } |
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200 } |
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201 |
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202 for (int i = 0; i < target->stack_size(); ++i) { |
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203 if (stack()[i] == this_type && target->stack()[i] != top) { |
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204 return false; |
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205 } |
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206 } |
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207 |
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208 return true; |
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209 } |
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210 |
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211 bool StackMapFrame::is_assignable_to( |
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212 const StackMapFrame* target, bool is_exception_handler, TRAPS) const { |
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213 if (_max_locals != target->max_locals() || |
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214 _stack_size != target->stack_size()) { |
0 | 215 return false; |
216 } | |
217 // Only need to compare type elements up to target->locals() or target->stack(). | |
218 // The remaining type elements in this state can be ignored because they are | |
219 // assignable to bogus type. | |
220 bool match_locals = is_assignable_to( | |
221 _locals, target->locals(), target->locals_size(), CHECK_false); | |
222 bool match_stack = is_assignable_to( | |
223 _stack, target->stack(), _stack_size, CHECK_false); | |
224 bool match_flags = (_flags | target->flags()) == target->flags(); | |
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225 |
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226 return match_locals && match_stack && |
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227 (match_flags || (is_exception_handler && has_flag_match_exception(target))); |
0 | 228 } |
229 | |
230 VerificationType StackMapFrame::pop_stack_ex(VerificationType type, TRAPS) { | |
231 if (_stack_size <= 0) { | |
232 verifier()->verify_error(_offset, "Operand stack underflow"); | |
233 return VerificationType::bogus_type(); | |
234 } | |
235 VerificationType top = _stack[--_stack_size]; | |
236 bool subtype = type.is_assignable_from( | |
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237 top, verifier(), CHECK_(VerificationType::bogus_type())); |
0 | 238 if (!subtype) { |
239 verifier()->verify_error(_offset, "Bad type on operand stack"); | |
240 return VerificationType::bogus_type(); | |
241 } | |
242 NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); ) | |
243 return top; | |
244 } | |
245 | |
246 VerificationType StackMapFrame::get_local( | |
247 int32_t index, VerificationType type, TRAPS) { | |
248 if (index >= _max_locals) { | |
249 verifier()->verify_error(_offset, "Local variable table overflow"); | |
250 return VerificationType::bogus_type(); | |
251 } | |
252 bool subtype = type.is_assignable_from(_locals[index], | |
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253 verifier(), CHECK_(VerificationType::bogus_type())); |
0 | 254 if (!subtype) { |
255 verifier()->verify_error(_offset, "Bad local variable type"); | |
256 return VerificationType::bogus_type(); | |
257 } | |
258 if(index >= _locals_size) { _locals_size = index + 1; } | |
259 return _locals[index]; | |
260 } | |
261 | |
262 void StackMapFrame::get_local_2( | |
263 int32_t index, VerificationType type1, VerificationType type2, TRAPS) { | |
264 assert(type1.is_long() || type1.is_double(), "must be long/double"); | |
265 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); | |
266 if (index >= _locals_size - 1) { | |
267 verifier()->verify_error(_offset, "get long/double overflows locals"); | |
268 return; | |
269 } | |
270 bool subtype1 = type1.is_assignable_from( | |
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271 _locals[index], verifier(), CHECK); |
0 | 272 bool subtype2 = type2.is_assignable_from( |
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273 _locals[index+1], verifier(), CHECK); |
0 | 274 if (!subtype1 || !subtype2) { |
275 verifier()->verify_error(_offset, "Bad local variable type"); | |
276 return; | |
277 } | |
278 } | |
279 | |
280 void StackMapFrame::set_local(int32_t index, VerificationType type, TRAPS) { | |
281 assert(!type.is_check(), "Must be a real type"); | |
282 if (index >= _max_locals) { | |
283 verifier()->verify_error("Local variable table overflow", _offset); | |
284 return; | |
285 } | |
286 // If type at index is double or long, set the next location to be unusable | |
287 if (_locals[index].is_double() || _locals[index].is_long()) { | |
288 assert((index + 1) < _locals_size, "Local variable table overflow"); | |
289 _locals[index + 1] = VerificationType::bogus_type(); | |
290 } | |
291 // If type at index is double_2 or long_2, set the previous location to be unusable | |
292 if (_locals[index].is_double2() || _locals[index].is_long2()) { | |
293 assert(index >= 1, "Local variable table underflow"); | |
294 _locals[index - 1] = VerificationType::bogus_type(); | |
295 } | |
296 _locals[index] = type; | |
297 if (index >= _locals_size) { | |
298 #ifdef ASSERT | |
299 for (int i=_locals_size; i<index; i++) { | |
300 assert(_locals[i] == VerificationType::bogus_type(), | |
301 "holes must be bogus type"); | |
302 } | |
303 #endif | |
304 _locals_size = index + 1; | |
305 } | |
306 } | |
307 | |
308 void StackMapFrame::set_local_2( | |
309 int32_t index, VerificationType type1, VerificationType type2, TRAPS) { | |
310 assert(type1.is_long() || type1.is_double(), "must be long/double"); | |
311 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); | |
312 if (index >= _max_locals - 1) { | |
313 verifier()->verify_error("Local variable table overflow", _offset); | |
314 return; | |
315 } | |
316 // If type at index+1 is double or long, set the next location to be unusable | |
317 if (_locals[index+1].is_double() || _locals[index+1].is_long()) { | |
318 assert((index + 2) < _locals_size, "Local variable table overflow"); | |
319 _locals[index + 2] = VerificationType::bogus_type(); | |
320 } | |
321 // If type at index is double_2 or long_2, set the previous location to be unusable | |
322 if (_locals[index].is_double2() || _locals[index].is_long2()) { | |
323 assert(index >= 1, "Local variable table underflow"); | |
324 _locals[index - 1] = VerificationType::bogus_type(); | |
325 } | |
326 _locals[index] = type1; | |
327 _locals[index+1] = type2; | |
328 if (index >= _locals_size - 1) { | |
329 #ifdef ASSERT | |
330 for (int i=_locals_size; i<index; i++) { | |
331 assert(_locals[i] == VerificationType::bogus_type(), | |
332 "holes must be bogus type"); | |
333 } | |
334 #endif | |
335 _locals_size = index + 2; | |
336 } | |
337 } | |
338 | |
339 #ifndef PRODUCT | |
340 | |
341 void StackMapFrame::print() const { | |
342 tty->print_cr("stackmap_frame[%d]:", _offset); | |
343 tty->print_cr("flags = 0x%x", _flags); | |
344 tty->print("locals[%d] = { ", _locals_size); | |
345 for (int32_t i = 0; i < _locals_size; i++) { | |
346 _locals[i].print_on(tty); | |
347 } | |
348 tty->print_cr(" }"); | |
349 tty->print("stack[%d] = { ", _stack_size); | |
350 for (int32_t j = 0; j < _stack_size; j++) { | |
351 _stack[j].print_on(tty); | |
352 } | |
353 tty->print_cr(" }"); | |
354 } | |
355 | |
356 #endif |