Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/stackMapFrame.cpp @ 2388:006b3750a4d4
Merge
author | jcoomes |
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date | Thu, 24 Mar 2011 23:06:13 -0700 |
parents | c1a6154012c8 |
children | 1d1603768966 7144a1d6e0a9 |
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" | |
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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 |
0 | 211 bool StackMapFrame::is_assignable_to(const StackMapFrame* target, TRAPS) const { |
212 if (_max_locals != target->max_locals() || _stack_size != target->stack_size()) { | |
213 return false; | |
214 } | |
215 // Only need to compare type elements up to target->locals() or target->stack(). | |
216 // The remaining type elements in this state can be ignored because they are | |
217 // assignable to bogus type. | |
218 bool match_locals = is_assignable_to( | |
219 _locals, target->locals(), target->locals_size(), CHECK_false); | |
220 bool match_stack = is_assignable_to( | |
221 _stack, target->stack(), _stack_size, CHECK_false); | |
222 bool match_flags = (_flags | target->flags()) == target->flags(); | |
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223 |
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224 return match_locals && match_stack && |
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225 (match_flags || has_flag_match_exception(target)); |
0 | 226 } |
227 | |
228 VerificationType StackMapFrame::pop_stack_ex(VerificationType type, TRAPS) { | |
229 if (_stack_size <= 0) { | |
230 verifier()->verify_error(_offset, "Operand stack underflow"); | |
231 return VerificationType::bogus_type(); | |
232 } | |
233 VerificationType top = _stack[--_stack_size]; | |
234 bool subtype = type.is_assignable_from( | |
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235 top, verifier(), CHECK_(VerificationType::bogus_type())); |
0 | 236 if (!subtype) { |
237 verifier()->verify_error(_offset, "Bad type on operand stack"); | |
238 return VerificationType::bogus_type(); | |
239 } | |
240 NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); ) | |
241 return top; | |
242 } | |
243 | |
244 VerificationType StackMapFrame::get_local( | |
245 int32_t index, VerificationType type, TRAPS) { | |
246 if (index >= _max_locals) { | |
247 verifier()->verify_error(_offset, "Local variable table overflow"); | |
248 return VerificationType::bogus_type(); | |
249 } | |
250 bool subtype = type.is_assignable_from(_locals[index], | |
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251 verifier(), CHECK_(VerificationType::bogus_type())); |
0 | 252 if (!subtype) { |
253 verifier()->verify_error(_offset, "Bad local variable type"); | |
254 return VerificationType::bogus_type(); | |
255 } | |
256 if(index >= _locals_size) { _locals_size = index + 1; } | |
257 return _locals[index]; | |
258 } | |
259 | |
260 void StackMapFrame::get_local_2( | |
261 int32_t index, VerificationType type1, VerificationType type2, TRAPS) { | |
262 assert(type1.is_long() || type1.is_double(), "must be long/double"); | |
263 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); | |
264 if (index >= _locals_size - 1) { | |
265 verifier()->verify_error(_offset, "get long/double overflows locals"); | |
266 return; | |
267 } | |
268 bool subtype1 = type1.is_assignable_from( | |
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269 _locals[index], verifier(), CHECK); |
0 | 270 bool subtype2 = type2.is_assignable_from( |
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271 _locals[index+1], verifier(), CHECK); |
0 | 272 if (!subtype1 || !subtype2) { |
273 verifier()->verify_error(_offset, "Bad local variable type"); | |
274 return; | |
275 } | |
276 } | |
277 | |
278 void StackMapFrame::set_local(int32_t index, VerificationType type, TRAPS) { | |
279 assert(!type.is_check(), "Must be a real type"); | |
280 if (index >= _max_locals) { | |
281 verifier()->verify_error("Local variable table overflow", _offset); | |
282 return; | |
283 } | |
284 // If type at index is double or long, set the next location to be unusable | |
285 if (_locals[index].is_double() || _locals[index].is_long()) { | |
286 assert((index + 1) < _locals_size, "Local variable table overflow"); | |
287 _locals[index + 1] = VerificationType::bogus_type(); | |
288 } | |
289 // If type at index is double_2 or long_2, set the previous location to be unusable | |
290 if (_locals[index].is_double2() || _locals[index].is_long2()) { | |
291 assert(index >= 1, "Local variable table underflow"); | |
292 _locals[index - 1] = VerificationType::bogus_type(); | |
293 } | |
294 _locals[index] = type; | |
295 if (index >= _locals_size) { | |
296 #ifdef ASSERT | |
297 for (int i=_locals_size; i<index; i++) { | |
298 assert(_locals[i] == VerificationType::bogus_type(), | |
299 "holes must be bogus type"); | |
300 } | |
301 #endif | |
302 _locals_size = index + 1; | |
303 } | |
304 } | |
305 | |
306 void StackMapFrame::set_local_2( | |
307 int32_t index, VerificationType type1, VerificationType type2, TRAPS) { | |
308 assert(type1.is_long() || type1.is_double(), "must be long/double"); | |
309 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); | |
310 if (index >= _max_locals - 1) { | |
311 verifier()->verify_error("Local variable table overflow", _offset); | |
312 return; | |
313 } | |
314 // If type at index+1 is double or long, set the next location to be unusable | |
315 if (_locals[index+1].is_double() || _locals[index+1].is_long()) { | |
316 assert((index + 2) < _locals_size, "Local variable table overflow"); | |
317 _locals[index + 2] = VerificationType::bogus_type(); | |
318 } | |
319 // If type at index is double_2 or long_2, set the previous location to be unusable | |
320 if (_locals[index].is_double2() || _locals[index].is_long2()) { | |
321 assert(index >= 1, "Local variable table underflow"); | |
322 _locals[index - 1] = VerificationType::bogus_type(); | |
323 } | |
324 _locals[index] = type1; | |
325 _locals[index+1] = type2; | |
326 if (index >= _locals_size - 1) { | |
327 #ifdef ASSERT | |
328 for (int i=_locals_size; i<index; i++) { | |
329 assert(_locals[i] == VerificationType::bogus_type(), | |
330 "holes must be bogus type"); | |
331 } | |
332 #endif | |
333 _locals_size = index + 2; | |
334 } | |
335 } | |
336 | |
337 #ifndef PRODUCT | |
338 | |
339 void StackMapFrame::print() const { | |
340 tty->print_cr("stackmap_frame[%d]:", _offset); | |
341 tty->print_cr("flags = 0x%x", _flags); | |
342 tty->print("locals[%d] = { ", _locals_size); | |
343 for (int32_t i = 0; i < _locals_size; i++) { | |
344 _locals[i].print_on(tty); | |
345 } | |
346 tty->print_cr(" }"); | |
347 tty->print("stack[%d] = { ", _stack_size); | |
348 for (int32_t j = 0; j < _stack_size; j++) { | |
349 _stack[j].print_on(tty); | |
350 } | |
351 tty->print_cr(" }"); | |
352 } | |
353 | |
354 #endif |