Mon, 24 Dec 2012 11:46:38 -0800
Merge
1 /*
2 * Copyright (c) 2003, 2012, 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.
22 *
23 */
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/symbol.hpp"
31 #include "runtime/handles.inline.hpp"
32 #include "utilities/globalDefinitions.hpp"
34 StackMapFrame::StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* v) :
35 _offset(0), _locals_size(0), _stack_size(0),
36 _stack_mark(0), _flags(0), _max_locals(max_locals),
37 _max_stack(max_stack), _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 }
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 }
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 }
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 }
91 VerificationType StackMapFrame::set_locals_from_arg(
92 const methodHandle m, VerificationType thisKlass, TRAPS) {
93 SignatureStream ss(m->signature());
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 }
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;
116 switch (ss.type()) {
117 case T_OBJECT:
118 case T_ARRAY:
119 {
120 Symbol* sig = ss.as_symbol(CHECK_(VerificationType::bogus_type()));
121 // Create another symbol to save as signature stream unreferences
122 // this symbol.
123 Symbol* sig_copy =
124 verifier()->create_temporary_symbol(sig, 0, sig->utf8_length(),
125 CHECK_(VerificationType::bogus_type()));
126 assert(sig_copy == sig, "symbols don't match");
127 return VerificationType::reference_type(sig_copy);
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 }
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 }
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 }
160 // Returns the location of the first mismatch, or 'len' if there are no
161 // mismatches
162 int StackMapFrame::is_assignable_to(
163 VerificationType* from, VerificationType* to, int32_t len, TRAPS) const {
164 int32_t i = 0;
165 for (i = 0; i < len; i++) {
166 if (!to[i].is_assignable_from(from[i], verifier(), THREAD)) {
167 break;
168 }
169 }
170 return i;
171 }
173 bool StackMapFrame::has_flag_match_exception(
174 const StackMapFrame* target) const {
175 // We allow flags of {UninitThis} to assign to {} if-and-only-if the
176 // target frame does not depend upon the current type.
177 // This is slightly too strict, as we need only enforce that the
178 // slots that were initialized by the <init> (the things that were
179 // UninitializedThis before initialize_object() converted them) are unused.
180 // However we didn't save that information so we'll enforce this upon
181 // anything that might have been initialized. This is a rare situation
182 // and javac never generates code that would end up here, but some profilers
183 // (such as NetBeans) might, when adding exception handlers in <init>
184 // methods to cover the invokespecial instruction. See 7020118.
186 assert(max_locals() == target->max_locals() &&
187 stack_size() == target->stack_size(), "StackMap sizes must match");
189 VerificationType top = VerificationType::top_type();
190 VerificationType this_type = verifier()->current_type();
192 if (!flag_this_uninit() || target->flags() != 0) {
193 return false;
194 }
196 for (int i = 0; i < target->locals_size(); ++i) {
197 if (locals()[i] == this_type && target->locals()[i] != top) {
198 return false;
199 }
200 }
202 for (int i = 0; i < target->stack_size(); ++i) {
203 if (stack()[i] == this_type && target->stack()[i] != top) {
204 return false;
205 }
206 }
208 return true;
209 }
211 bool StackMapFrame::is_assignable_to(
212 const StackMapFrame* target, bool is_exception_handler,
213 ErrorContext* ctx, TRAPS) const {
214 if (_max_locals != target->max_locals()) {
215 *ctx = ErrorContext::locals_size_mismatch(
216 _offset, (StackMapFrame*)this, (StackMapFrame*)target);
217 return false;
218 }
219 if (_stack_size != target->stack_size()) {
220 *ctx = ErrorContext::stack_size_mismatch(
221 _offset, (StackMapFrame*)this, (StackMapFrame*)target);
222 return false;
223 }
224 // Only need to compare type elements up to target->locals() or target->stack().
225 // The remaining type elements in this state can be ignored because they are
226 // assignable to bogus type.
227 int mismatch_loc;
228 mismatch_loc = is_assignable_to(
229 _locals, target->locals(), target->locals_size(), THREAD);
230 if (mismatch_loc != target->locals_size()) {
231 *ctx = ErrorContext::bad_type(target->offset(),
232 TypeOrigin::local(mismatch_loc, (StackMapFrame*)this),
233 TypeOrigin::sm_local(mismatch_loc, (StackMapFrame*)target));
234 return false;
235 }
236 mismatch_loc = is_assignable_to(_stack, target->stack(), _stack_size, THREAD);
237 if (mismatch_loc != _stack_size) {
238 *ctx = ErrorContext::bad_type(target->offset(),
239 TypeOrigin::stack(mismatch_loc, (StackMapFrame*)this),
240 TypeOrigin::sm_stack(mismatch_loc, (StackMapFrame*)target));
241 return false;
242 }
244 bool match_flags = (_flags | target->flags()) == target->flags();
245 if (match_flags || is_exception_handler && has_flag_match_exception(target)) {
246 return true;
247 } else {
248 *ctx = ErrorContext::bad_flags(target->offset(),
249 (StackMapFrame*)this, (StackMapFrame*)target);
250 return false;
251 }
252 }
254 VerificationType StackMapFrame::pop_stack_ex(VerificationType type, TRAPS) {
255 if (_stack_size <= 0) {
256 verifier()->verify_error(
257 ErrorContext::stack_underflow(_offset, this),
258 "Operand stack underflow");
259 return VerificationType::bogus_type();
260 }
261 VerificationType top = _stack[--_stack_size];
262 bool subtype = type.is_assignable_from(
263 top, verifier(), CHECK_(VerificationType::bogus_type()));
264 if (!subtype) {
265 verifier()->verify_error(
266 ErrorContext::bad_type(_offset, stack_top_ctx(),
267 TypeOrigin::implicit(type)),
268 "Bad type on operand stack");
269 return VerificationType::bogus_type();
270 }
271 return top;
272 }
274 VerificationType StackMapFrame::get_local(
275 int32_t index, VerificationType type, TRAPS) {
276 if (index >= _max_locals) {
277 verifier()->verify_error(
278 ErrorContext::bad_local_index(_offset, index),
279 "Local variable table overflow");
280 return VerificationType::bogus_type();
281 }
282 bool subtype = type.is_assignable_from(_locals[index],
283 verifier(), CHECK_(VerificationType::bogus_type()));
284 if (!subtype) {
285 verifier()->verify_error(
286 ErrorContext::bad_type(_offset,
287 TypeOrigin::local(index, this),
288 TypeOrigin::implicit(type)),
289 "Bad local variable type");
290 return VerificationType::bogus_type();
291 }
292 if(index >= _locals_size) { _locals_size = index + 1; }
293 return _locals[index];
294 }
296 void StackMapFrame::get_local_2(
297 int32_t index, VerificationType type1, VerificationType type2, TRAPS) {
298 assert(type1.is_long() || type1.is_double(), "must be long/double");
299 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2");
300 if (index >= _locals_size - 1) {
301 verifier()->verify_error(
302 ErrorContext::bad_local_index(_offset, index),
303 "get long/double overflows locals");
304 return;
305 }
306 bool subtype = type1.is_assignable_from(_locals[index], verifier(), CHECK);
307 if (!subtype) {
308 verifier()->verify_error(
309 ErrorContext::bad_type(_offset,
310 TypeOrigin::local(index, this), TypeOrigin::implicit(type1)),
311 "Bad local variable type");
312 } else {
313 subtype = type2.is_assignable_from(_locals[index + 1], verifier(), CHECK);
314 if (!subtype) {
315 /* Unreachable? All local store routines convert a split long or double
316 * into a TOP during the store. So we should never end up seeing an
317 * orphaned half. */
318 verifier()->verify_error(
319 ErrorContext::bad_type(_offset,
320 TypeOrigin::local(index + 1, this), TypeOrigin::implicit(type2)),
321 "Bad local variable type");
322 }
323 }
324 }
326 void StackMapFrame::set_local(int32_t index, VerificationType type, TRAPS) {
327 assert(!type.is_check(), "Must be a real type");
328 if (index >= _max_locals) {
329 verifier()->verify_error(
330 ErrorContext::bad_local_index(_offset, index),
331 "Local variable table overflow");
332 return;
333 }
334 // If type at index is double or long, set the next location to be unusable
335 if (_locals[index].is_double() || _locals[index].is_long()) {
336 assert((index + 1) < _locals_size, "Local variable table overflow");
337 _locals[index + 1] = VerificationType::bogus_type();
338 }
339 // If type at index is double_2 or long_2, set the previous location to be unusable
340 if (_locals[index].is_double2() || _locals[index].is_long2()) {
341 assert(index >= 1, "Local variable table underflow");
342 _locals[index - 1] = VerificationType::bogus_type();
343 }
344 _locals[index] = type;
345 if (index >= _locals_size) {
346 #ifdef ASSERT
347 for (int i=_locals_size; i<index; i++) {
348 assert(_locals[i] == VerificationType::bogus_type(),
349 "holes must be bogus type");
350 }
351 #endif
352 _locals_size = index + 1;
353 }
354 }
356 void StackMapFrame::set_local_2(
357 int32_t index, VerificationType type1, VerificationType type2, TRAPS) {
358 assert(type1.is_long() || type1.is_double(), "must be long/double");
359 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2");
360 if (index >= _max_locals - 1) {
361 verifier()->verify_error(
362 ErrorContext::bad_local_index(_offset, index),
363 "Local variable table overflow");
364 return;
365 }
366 // If type at index+1 is double or long, set the next location to be unusable
367 if (_locals[index+1].is_double() || _locals[index+1].is_long()) {
368 assert((index + 2) < _locals_size, "Local variable table overflow");
369 _locals[index + 2] = VerificationType::bogus_type();
370 }
371 // If type at index is double_2 or long_2, set the previous location to be unusable
372 if (_locals[index].is_double2() || _locals[index].is_long2()) {
373 assert(index >= 1, "Local variable table underflow");
374 _locals[index - 1] = VerificationType::bogus_type();
375 }
376 _locals[index] = type1;
377 _locals[index+1] = type2;
378 if (index >= _locals_size - 1) {
379 #ifdef ASSERT
380 for (int i=_locals_size; i<index; i++) {
381 assert(_locals[i] == VerificationType::bogus_type(),
382 "holes must be bogus type");
383 }
384 #endif
385 _locals_size = index + 2;
386 }
387 }
389 TypeOrigin StackMapFrame::stack_top_ctx() {
390 return TypeOrigin::stack(_stack_size, this);
391 }
393 void StackMapFrame::print_on(outputStream* str) const {
394 str->indent().print_cr("bci: @%d", _offset);
395 str->indent().print_cr("flags: {%s }",
396 flag_this_uninit() ? " flagThisUninit" : "");
397 str->indent().print("locals: {");
398 for (int32_t i = 0; i < _locals_size; ++i) {
399 str->print(" ");
400 _locals[i].print_on(str);
401 if (i != _locals_size - 1) {
402 str->print(",");
403 }
404 }
405 str->print_cr(" }");
406 str->indent().print("stack: {");
407 for (int32_t j = 0; j < _stack_size; ++j) {
408 str->print(" ");
409 _stack[j].print_on(str);
410 if (j != _stack_size - 1) {
411 str->print(",");
412 }
413 }
414 str->print_cr(" }");
415 }