Mercurial > hg > truffle
annotate src/share/vm/classfile/stackMapFrame.cpp @ 2477:3449f5e02cc4
Merge
| author | coleenp |
|---|---|
| date | Tue, 12 Apr 2011 14:18:53 -0700 |
| parents | 1d1603768966 7144a1d6e0a9 |
| children | 4ee06e614636 |
| rev | line source |
|---|---|
| 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 |