Mercurial > hg > graal-jvmci-8
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 1747:53dbe853fb3a
6896381: CTW fails share/vm/ci/bcEscapeAnalyzer.cpp:99, assert(_stack_height < _max_stack,"stack overflow")
Summary: Check constant Tag type instead of calling get_constant().
Reviewed-by: never
| author | kvn |
|---|---|
| date | Mon, 23 Aug 2010 09:09:36 -0700 |
| parents | 8099e71601df |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2009, 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 | |
| 25 | |
| 26 #include "incls/_precompiled.incl" | |
| 27 #include "incls/_bcEscapeAnalyzer.cpp.incl" | |
| 28 | |
| 29 | |
| 30 #ifndef PRODUCT | |
| 31 #define TRACE_BCEA(level, code) \ | |
| 32 if (EstimateArgEscape && BCEATraceLevel >= level) { \ | |
| 33 code; \ | |
| 34 } | |
| 35 #else | |
| 36 #define TRACE_BCEA(level, code) | |
| 37 #endif | |
| 38 | |
| 39 // Maintain a map of which aguments a local variable or | |
| 40 // stack slot may contain. In addition to tracking | |
| 41 // arguments, it tracks two special values, "allocated" | |
| 42 // which represents any object allocated in the current | |
| 43 // method, and "unknown" which is any other object. | |
| 44 // Up to 30 arguments are handled, with the last one | |
| 45 // representing summary information for any extra arguments | |
| 46 class BCEscapeAnalyzer::ArgumentMap { | |
| 47 uint _bits; | |
| 48 enum {MAXBIT = 29, | |
| 49 ALLOCATED = 1, | |
| 50 UNKNOWN = 2}; | |
| 51 | |
| 52 uint int_to_bit(uint e) const { | |
| 53 if (e > MAXBIT) | |
| 54 e = MAXBIT; | |
| 55 return (1 << (e + 2)); | |
| 56 } | |
| 57 | |
| 58 public: | |
| 59 ArgumentMap() { _bits = 0;} | |
| 60 void set_bits(uint bits) { _bits = bits;} | |
| 61 uint get_bits() const { return _bits;} | |
| 62 void clear() { _bits = 0;} | |
| 63 void set_all() { _bits = ~0u; } | |
| 64 bool is_empty() const { return _bits == 0; } | |
| 65 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } | |
| 66 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } | |
| 67 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } | |
| 68 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } | |
| 69 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } | |
| 70 void set(uint var) { _bits = int_to_bit(var); } | |
| 71 void add(uint var) { _bits |= int_to_bit(var); } | |
| 72 void add_unknown() { _bits = UNKNOWN; } | |
| 73 void add_allocated() { _bits = ALLOCATED; } | |
| 74 void set_union(const ArgumentMap &am) { _bits |= am._bits; } | |
| 75 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } | |
| 76 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } | |
| 77 void operator=(const ArgumentMap &am) { _bits = am._bits; } | |
| 78 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } | |
| 79 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } | |
| 80 }; | |
| 81 | |
| 82 class BCEscapeAnalyzer::StateInfo { | |
| 83 public: | |
| 84 ArgumentMap *_vars; | |
| 85 ArgumentMap *_stack; | |
| 86 short _stack_height; | |
| 87 short _max_stack; | |
| 88 bool _initialized; | |
| 89 ArgumentMap empty_map; | |
| 90 | |
| 91 StateInfo() { | |
| 92 empty_map.clear(); | |
| 93 } | |
| 94 | |
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95 ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } |
| 0 | 96 ArgumentMap apop() { return raw_pop(); } |
| 97 void spop() { raw_pop(); } | |
| 98 void lpop() { spop(); spop(); } | |
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99 void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } |
| 0 | 100 void apush(ArgumentMap i) { raw_push(i); } |
| 101 void spush() { raw_push(empty_map); } | |
| 102 void lpush() { spush(); spush(); } | |
| 103 | |
| 104 }; | |
| 105 | |
| 106 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { | |
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107 for (int i = 0; i < _arg_size; i++) { |
| 0 | 108 if (vars.contains(i)) |
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109 _arg_returned.set(i); |
| 0 | 110 } |
| 111 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); | |
| 112 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); | |
| 113 } | |
| 114 | |
| 115 // return true if any element of vars is an argument | |
| 116 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { | |
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117 for (int i = 0; i < _arg_size; i++) { |
| 0 | 118 if (vars.contains(i)) |
| 119 return true; | |
| 120 } | |
| 121 return false; | |
| 122 } | |
| 123 | |
| 124 // return true if any element of vars is an arg_stack argument | |
| 125 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ | |
| 126 if (_conservative) | |
| 127 return true; | |
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128 for (int i = 0; i < _arg_size; i++) { |
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129 if (vars.contains(i) && _arg_stack.test(i)) |
| 0 | 130 return true; |
| 131 } | |
| 132 return false; | |
| 133 } | |
| 134 | |
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135 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { |
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136 for (int i = 0; i < _arg_size; i++) { |
| 0 | 137 if (vars.contains(i)) { |
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138 bm >>= i; |
| 0 | 139 } |
| 140 } | |
| 141 } | |
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142 |
| 0 | 143 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { |
| 144 clear_bits(vars, _arg_local); | |
| 145 } | |
| 146 | |
| 147 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars) { | |
| 148 clear_bits(vars, _arg_local); | |
| 149 clear_bits(vars, _arg_stack); | |
| 150 if (vars.contains_allocated()) | |
| 151 _allocated_escapes = true; | |
| 152 } | |
| 153 | |
| 154 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
| 155 clear_bits(vars, _dirty); | |
| 156 } | |
| 157 | |
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158 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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159 |
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160 for (int i = 0; i < _arg_size; i++) { |
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161 if (vars.contains(i)) { |
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162 set_arg_modified(i, offs, size); |
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163 } |
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164 } |
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165 if (vars.contains_unknown()) |
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166 _unknown_modified = true; |
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167 } |
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168 |
| 0 | 169 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
| 170 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
| 171 if (scope->method() == callee) { | |
| 172 return true; | |
| 173 } | |
| 174 } | |
| 175 return false; | |
| 176 } | |
| 177 | |
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178 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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179 if (offset == OFFSET_ANY) |
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180 return _arg_modified[arg] != 0; |
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181 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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182 bool modified = false; |
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183 int l = offset / HeapWordSize; |
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184 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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185 if (l > ARG_OFFSET_MAX) |
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186 l = ARG_OFFSET_MAX; |
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187 if (h > ARG_OFFSET_MAX+1) |
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188 h = ARG_OFFSET_MAX + 1; |
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189 for (int i = l; i < h; i++) { |
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190 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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191 } |
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192 return modified; |
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193 } |
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194 |
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195 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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196 if (offset == OFFSET_ANY) { |
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197 _arg_modified[arg] = (uint) -1; |
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198 return; |
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199 } |
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200 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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201 int l = offset / HeapWordSize; |
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202 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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203 if (l > ARG_OFFSET_MAX) |
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204 l = ARG_OFFSET_MAX; |
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205 if (h > ARG_OFFSET_MAX+1) |
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206 h = ARG_OFFSET_MAX + 1; |
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207 for (int i = l; i < h; i++) { |
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208 _arg_modified[arg] |= (1 << i); |
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209 } |
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210 } |
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211 |
| 0 | 212 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
| 213 int i; | |
| 214 | |
| 215 // retrieve information about the callee | |
| 216 ciInstanceKlass* klass = target->holder(); | |
| 217 ciInstanceKlass* calling_klass = method()->holder(); | |
| 218 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
| 219 ciInstanceKlass* actual_recv = callee_holder; | |
| 220 | |
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221 // some methods are obviously bindable without any type checks so |
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222 // convert them directly to an invokespecial. |
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223 if (target->is_loaded() && !target->is_abstract() && |
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224 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) { |
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225 code = Bytecodes::_invokespecial; |
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226 } |
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227 |
| 0 | 228 // compute size of arguments |
| 229 int arg_size = target->arg_size(); | |
| 230 if (!target->is_loaded() && code == Bytecodes::_invokestatic) { | |
| 231 arg_size--; | |
| 232 } | |
| 233 int arg_base = MAX2(state._stack_height - arg_size, 0); | |
| 234 | |
| 235 // direct recursive calls are skipped if they can be bound statically without introducing | |
| 236 // dependencies and if parameters are passed at the same position as in the current method | |
| 237 // other calls are skipped if there are no unescaped arguments passed to them | |
| 238 bool directly_recursive = (method() == target) && | |
| 239 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
| 240 | |
| 241 // check if analysis of callee can safely be skipped | |
| 242 bool skip_callee = true; | |
| 243 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
| 244 ArgumentMap arg = state._stack[i]; | |
| 245 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
| 246 } | |
| 247 if (skip_callee) { | |
| 248 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
| 249 for (i = 0; i < arg_size; i++) { | |
| 250 set_method_escape(state.raw_pop()); | |
| 251 } | |
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252 _unknown_modified = true; // assume the worst since we don't analyze the called method |
| 0 | 253 return; |
| 254 } | |
| 255 | |
| 256 // determine actual method (use CHA if necessary) | |
| 257 ciMethod* inline_target = NULL; | |
| 258 if (target->is_loaded() && klass->is_loaded() | |
| 259 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
| 260 && target->will_link(klass, callee_holder, code)) { | |
| 261 if (code == Bytecodes::_invokestatic | |
| 262 || code == Bytecodes::_invokespecial | |
| 263 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
| 264 inline_target = target; | |
| 265 } else { | |
| 266 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
| 271 // analyze callee | |
| 272 BCEscapeAnalyzer analyzer(inline_target, this); | |
| 273 | |
| 274 // adjust escape state of actual parameters | |
| 275 bool must_record_dependencies = false; | |
| 276 for (i = arg_size - 1; i >= 0; i--) { | |
| 277 ArgumentMap arg = state.raw_pop(); | |
| 278 if (!is_argument(arg)) | |
| 279 continue; | |
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280 for (int j = 0; j < _arg_size; j++) { |
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281 if (arg.contains(j)) { |
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282 _arg_modified[j] |= analyzer._arg_modified[i]; |
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283 } |
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284 } |
| 0 | 285 if (!is_arg_stack(arg)) { |
| 286 // arguments have already been recognized as escaping | |
| 287 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
| 288 set_method_escape(arg); | |
| 289 must_record_dependencies = true; | |
| 290 } else { | |
| 291 set_global_escape(arg); | |
| 292 } | |
| 293 } | |
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294 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
| 0 | 295 |
| 296 // record dependencies if at least one parameter retained stack-allocatable | |
| 297 if (must_record_dependencies) { | |
| 298 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
| 299 _dependencies.append(actual_recv); | |
| 300 _dependencies.append(inline_target); | |
| 301 } | |
| 302 _dependencies.appendAll(analyzer.dependencies()); | |
| 303 } | |
| 304 } else { | |
| 305 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
| 306 target->name()->as_utf8())); | |
| 307 // conservatively mark all actual parameters as escaping globally | |
| 308 for (i = 0; i < arg_size; i++) { | |
| 309 ArgumentMap arg = state.raw_pop(); | |
| 310 if (!is_argument(arg)) | |
| 311 continue; | |
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312 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 313 set_global_escape(arg); |
| 314 } | |
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315 _unknown_modified = true; // assume the worst since we don't know the called method |
| 0 | 316 } |
| 317 } | |
| 318 | |
| 319 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
| 320 return ((~arg_set1) | arg_set2) == 0; | |
| 321 } | |
| 322 | |
| 323 | |
| 324 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
| 325 | |
| 326 blk->set_processed(); | |
| 327 ciBytecodeStream s(method()); | |
| 328 int limit_bci = blk->limit_bci(); | |
| 329 bool fall_through = false; | |
| 330 ArgumentMap allocated_obj; | |
| 331 allocated_obj.add_allocated(); | |
| 332 ArgumentMap unknown_obj; | |
| 333 unknown_obj.add_unknown(); | |
| 334 ArgumentMap empty_map; | |
| 335 | |
| 336 s.reset_to_bci(blk->start_bci()); | |
| 337 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
| 338 fall_through = true; | |
| 339 switch (s.cur_bc()) { | |
| 340 case Bytecodes::_nop: | |
| 341 break; | |
| 342 case Bytecodes::_aconst_null: | |
| 343 state.apush(empty_map); | |
| 344 break; | |
| 345 case Bytecodes::_iconst_m1: | |
| 346 case Bytecodes::_iconst_0: | |
| 347 case Bytecodes::_iconst_1: | |
| 348 case Bytecodes::_iconst_2: | |
| 349 case Bytecodes::_iconst_3: | |
| 350 case Bytecodes::_iconst_4: | |
| 351 case Bytecodes::_iconst_5: | |
| 352 case Bytecodes::_fconst_0: | |
| 353 case Bytecodes::_fconst_1: | |
| 354 case Bytecodes::_fconst_2: | |
| 355 case Bytecodes::_bipush: | |
| 356 case Bytecodes::_sipush: | |
| 357 state.spush(); | |
| 358 break; | |
| 359 case Bytecodes::_lconst_0: | |
| 360 case Bytecodes::_lconst_1: | |
| 361 case Bytecodes::_dconst_0: | |
| 362 case Bytecodes::_dconst_1: | |
| 363 state.lpush(); | |
| 364 break; | |
| 365 case Bytecodes::_ldc: | |
| 366 case Bytecodes::_ldc_w: | |
| 367 case Bytecodes::_ldc2_w: | |
|
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368 { |
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369 // Avoid calling get_constant() which will try to allocate |
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370 // unloaded constant. We need only constant's type. |
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371 int index = s.get_constant_pool_index(); |
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372 constantTag tag = s.get_constant_pool_tag(index); |
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373 if (tag.is_long() || tag.is_double()) { |
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374 // Only longs and doubles use 2 stack slots. |
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375 state.lpush(); |
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376 } else { |
| 0 | 377 state.spush(); |
| 378 } | |
| 379 break; | |
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380 } |
| 0 | 381 case Bytecodes::_aload: |
| 382 state.apush(state._vars[s.get_index()]); | |
| 383 break; | |
| 384 case Bytecodes::_iload: | |
| 385 case Bytecodes::_fload: | |
| 386 case Bytecodes::_iload_0: | |
| 387 case Bytecodes::_iload_1: | |
| 388 case Bytecodes::_iload_2: | |
| 389 case Bytecodes::_iload_3: | |
| 390 case Bytecodes::_fload_0: | |
| 391 case Bytecodes::_fload_1: | |
| 392 case Bytecodes::_fload_2: | |
| 393 case Bytecodes::_fload_3: | |
| 394 state.spush(); | |
| 395 break; | |
| 396 case Bytecodes::_lload: | |
| 397 case Bytecodes::_dload: | |
| 398 case Bytecodes::_lload_0: | |
| 399 case Bytecodes::_lload_1: | |
| 400 case Bytecodes::_lload_2: | |
| 401 case Bytecodes::_lload_3: | |
| 402 case Bytecodes::_dload_0: | |
| 403 case Bytecodes::_dload_1: | |
| 404 case Bytecodes::_dload_2: | |
| 405 case Bytecodes::_dload_3: | |
| 406 state.lpush(); | |
| 407 break; | |
| 408 case Bytecodes::_aload_0: | |
| 409 state.apush(state._vars[0]); | |
| 410 break; | |
| 411 case Bytecodes::_aload_1: | |
| 412 state.apush(state._vars[1]); | |
| 413 break; | |
| 414 case Bytecodes::_aload_2: | |
| 415 state.apush(state._vars[2]); | |
| 416 break; | |
| 417 case Bytecodes::_aload_3: | |
| 418 state.apush(state._vars[3]); | |
| 419 break; | |
| 420 case Bytecodes::_iaload: | |
| 421 case Bytecodes::_faload: | |
| 422 case Bytecodes::_baload: | |
| 423 case Bytecodes::_caload: | |
| 424 case Bytecodes::_saload: | |
| 425 state.spop(); | |
| 426 set_method_escape(state.apop()); | |
| 427 state.spush(); | |
| 428 break; | |
| 429 case Bytecodes::_laload: | |
| 430 case Bytecodes::_daload: | |
| 431 state.spop(); | |
| 432 set_method_escape(state.apop()); | |
| 433 state.lpush(); | |
| 434 break; | |
| 435 case Bytecodes::_aaload: | |
| 436 { state.spop(); | |
| 437 ArgumentMap array = state.apop(); | |
| 438 set_method_escape(array); | |
| 439 state.apush(unknown_obj); | |
| 440 set_dirty(array); | |
| 441 } | |
| 442 break; | |
| 443 case Bytecodes::_istore: | |
| 444 case Bytecodes::_fstore: | |
| 445 case Bytecodes::_istore_0: | |
| 446 case Bytecodes::_istore_1: | |
| 447 case Bytecodes::_istore_2: | |
| 448 case Bytecodes::_istore_3: | |
| 449 case Bytecodes::_fstore_0: | |
| 450 case Bytecodes::_fstore_1: | |
| 451 case Bytecodes::_fstore_2: | |
| 452 case Bytecodes::_fstore_3: | |
| 453 state.spop(); | |
| 454 break; | |
| 455 case Bytecodes::_lstore: | |
| 456 case Bytecodes::_dstore: | |
| 457 case Bytecodes::_lstore_0: | |
| 458 case Bytecodes::_lstore_1: | |
| 459 case Bytecodes::_lstore_2: | |
| 460 case Bytecodes::_lstore_3: | |
| 461 case Bytecodes::_dstore_0: | |
| 462 case Bytecodes::_dstore_1: | |
| 463 case Bytecodes::_dstore_2: | |
| 464 case Bytecodes::_dstore_3: | |
| 465 state.lpop(); | |
| 466 break; | |
| 467 case Bytecodes::_astore: | |
| 468 state._vars[s.get_index()] = state.apop(); | |
| 469 break; | |
| 470 case Bytecodes::_astore_0: | |
| 471 state._vars[0] = state.apop(); | |
| 472 break; | |
| 473 case Bytecodes::_astore_1: | |
| 474 state._vars[1] = state.apop(); | |
| 475 break; | |
| 476 case Bytecodes::_astore_2: | |
| 477 state._vars[2] = state.apop(); | |
| 478 break; | |
| 479 case Bytecodes::_astore_3: | |
| 480 state._vars[3] = state.apop(); | |
| 481 break; | |
| 482 case Bytecodes::_iastore: | |
| 483 case Bytecodes::_fastore: | |
| 484 case Bytecodes::_bastore: | |
| 485 case Bytecodes::_castore: | |
| 486 case Bytecodes::_sastore: | |
| 487 { | |
| 488 state.spop(); | |
| 489 state.spop(); | |
| 490 ArgumentMap arr = state.apop(); | |
| 491 set_method_escape(arr); | |
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492 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 493 break; |
| 494 } | |
| 495 case Bytecodes::_lastore: | |
| 496 case Bytecodes::_dastore: | |
| 497 { | |
| 498 state.lpop(); | |
| 499 state.spop(); | |
| 500 ArgumentMap arr = state.apop(); | |
| 501 set_method_escape(arr); | |
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502 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
| 0 | 503 break; |
| 504 } | |
| 505 case Bytecodes::_aastore: | |
| 506 { | |
| 507 set_global_escape(state.apop()); | |
| 508 state.spop(); | |
| 509 ArgumentMap arr = state.apop(); | |
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510 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
| 0 | 511 break; |
| 512 } | |
| 513 case Bytecodes::_pop: | |
| 514 state.raw_pop(); | |
| 515 break; | |
| 516 case Bytecodes::_pop2: | |
| 517 state.raw_pop(); | |
| 518 state.raw_pop(); | |
| 519 break; | |
| 520 case Bytecodes::_dup: | |
| 521 { ArgumentMap w1 = state.raw_pop(); | |
| 522 state.raw_push(w1); | |
| 523 state.raw_push(w1); | |
| 524 } | |
| 525 break; | |
| 526 case Bytecodes::_dup_x1: | |
| 527 { ArgumentMap w1 = state.raw_pop(); | |
| 528 ArgumentMap w2 = state.raw_pop(); | |
| 529 state.raw_push(w1); | |
| 530 state.raw_push(w2); | |
| 531 state.raw_push(w1); | |
| 532 } | |
| 533 break; | |
| 534 case Bytecodes::_dup_x2: | |
| 535 { ArgumentMap w1 = state.raw_pop(); | |
| 536 ArgumentMap w2 = state.raw_pop(); | |
| 537 ArgumentMap w3 = state.raw_pop(); | |
| 538 state.raw_push(w1); | |
| 539 state.raw_push(w3); | |
| 540 state.raw_push(w2); | |
| 541 state.raw_push(w1); | |
| 542 } | |
| 543 break; | |
| 544 case Bytecodes::_dup2: | |
| 545 { ArgumentMap w1 = state.raw_pop(); | |
| 546 ArgumentMap w2 = state.raw_pop(); | |
| 547 state.raw_push(w2); | |
| 548 state.raw_push(w1); | |
| 549 state.raw_push(w2); | |
| 550 state.raw_push(w1); | |
| 551 } | |
| 552 break; | |
| 553 case Bytecodes::_dup2_x1: | |
| 554 { ArgumentMap w1 = state.raw_pop(); | |
| 555 ArgumentMap w2 = state.raw_pop(); | |
| 556 ArgumentMap w3 = state.raw_pop(); | |
| 557 state.raw_push(w2); | |
| 558 state.raw_push(w1); | |
| 559 state.raw_push(w3); | |
| 560 state.raw_push(w2); | |
| 561 state.raw_push(w1); | |
| 562 } | |
| 563 break; | |
| 564 case Bytecodes::_dup2_x2: | |
| 565 { ArgumentMap w1 = state.raw_pop(); | |
| 566 ArgumentMap w2 = state.raw_pop(); | |
| 567 ArgumentMap w3 = state.raw_pop(); | |
| 568 ArgumentMap w4 = state.raw_pop(); | |
| 569 state.raw_push(w2); | |
| 570 state.raw_push(w1); | |
| 571 state.raw_push(w4); | |
| 572 state.raw_push(w3); | |
| 573 state.raw_push(w2); | |
| 574 state.raw_push(w1); | |
| 575 } | |
| 576 break; | |
| 577 case Bytecodes::_swap: | |
| 578 { ArgumentMap w1 = state.raw_pop(); | |
| 579 ArgumentMap w2 = state.raw_pop(); | |
| 580 state.raw_push(w1); | |
| 581 state.raw_push(w2); | |
| 582 } | |
| 583 break; | |
| 584 case Bytecodes::_iadd: | |
| 585 case Bytecodes::_fadd: | |
| 586 case Bytecodes::_isub: | |
| 587 case Bytecodes::_fsub: | |
| 588 case Bytecodes::_imul: | |
| 589 case Bytecodes::_fmul: | |
| 590 case Bytecodes::_idiv: | |
| 591 case Bytecodes::_fdiv: | |
| 592 case Bytecodes::_irem: | |
| 593 case Bytecodes::_frem: | |
| 594 case Bytecodes::_iand: | |
| 595 case Bytecodes::_ior: | |
| 596 case Bytecodes::_ixor: | |
| 597 state.spop(); | |
| 598 state.spop(); | |
| 599 state.spush(); | |
| 600 break; | |
| 601 case Bytecodes::_ladd: | |
| 602 case Bytecodes::_dadd: | |
| 603 case Bytecodes::_lsub: | |
| 604 case Bytecodes::_dsub: | |
| 605 case Bytecodes::_lmul: | |
| 606 case Bytecodes::_dmul: | |
| 607 case Bytecodes::_ldiv: | |
| 608 case Bytecodes::_ddiv: | |
| 609 case Bytecodes::_lrem: | |
| 610 case Bytecodes::_drem: | |
| 611 case Bytecodes::_land: | |
| 612 case Bytecodes::_lor: | |
| 613 case Bytecodes::_lxor: | |
| 614 state.lpop(); | |
| 615 state.lpop(); | |
| 616 state.lpush(); | |
| 617 break; | |
| 618 case Bytecodes::_ishl: | |
| 619 case Bytecodes::_ishr: | |
| 620 case Bytecodes::_iushr: | |
| 621 state.spop(); | |
| 622 state.spop(); | |
| 623 state.spush(); | |
| 624 break; | |
| 625 case Bytecodes::_lshl: | |
| 626 case Bytecodes::_lshr: | |
| 627 case Bytecodes::_lushr: | |
| 628 state.spop(); | |
| 629 state.lpop(); | |
| 630 state.lpush(); | |
| 631 break; | |
| 632 case Bytecodes::_ineg: | |
| 633 case Bytecodes::_fneg: | |
| 634 state.spop(); | |
| 635 state.spush(); | |
| 636 break; | |
| 637 case Bytecodes::_lneg: | |
| 638 case Bytecodes::_dneg: | |
| 639 state.lpop(); | |
| 640 state.lpush(); | |
| 641 break; | |
| 642 case Bytecodes::_iinc: | |
| 643 break; | |
| 644 case Bytecodes::_i2l: | |
| 645 case Bytecodes::_i2d: | |
| 646 case Bytecodes::_f2l: | |
| 647 case Bytecodes::_f2d: | |
| 648 state.spop(); | |
| 649 state.lpush(); | |
| 650 break; | |
| 651 case Bytecodes::_i2f: | |
| 652 case Bytecodes::_f2i: | |
| 653 state.spop(); | |
| 654 state.spush(); | |
| 655 break; | |
| 656 case Bytecodes::_l2i: | |
| 657 case Bytecodes::_l2f: | |
| 658 case Bytecodes::_d2i: | |
| 659 case Bytecodes::_d2f: | |
| 660 state.lpop(); | |
| 661 state.spush(); | |
| 662 break; | |
| 663 case Bytecodes::_l2d: | |
| 664 case Bytecodes::_d2l: | |
| 665 state.lpop(); | |
| 666 state.lpush(); | |
| 667 break; | |
| 668 case Bytecodes::_i2b: | |
| 669 case Bytecodes::_i2c: | |
| 670 case Bytecodes::_i2s: | |
| 671 state.spop(); | |
| 672 state.spush(); | |
| 673 break; | |
| 674 case Bytecodes::_lcmp: | |
| 675 case Bytecodes::_dcmpl: | |
| 676 case Bytecodes::_dcmpg: | |
| 677 state.lpop(); | |
| 678 state.lpop(); | |
| 679 state.spush(); | |
| 680 break; | |
| 681 case Bytecodes::_fcmpl: | |
| 682 case Bytecodes::_fcmpg: | |
| 683 state.spop(); | |
| 684 state.spop(); | |
| 685 state.spush(); | |
| 686 break; | |
| 687 case Bytecodes::_ifeq: | |
| 688 case Bytecodes::_ifne: | |
| 689 case Bytecodes::_iflt: | |
| 690 case Bytecodes::_ifge: | |
| 691 case Bytecodes::_ifgt: | |
| 692 case Bytecodes::_ifle: | |
| 693 { | |
| 694 state.spop(); | |
| 695 int dest_bci = s.get_dest(); | |
| 696 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 697 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 698 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 699 break; | |
| 700 } | |
| 701 case Bytecodes::_if_icmpeq: | |
| 702 case Bytecodes::_if_icmpne: | |
| 703 case Bytecodes::_if_icmplt: | |
| 704 case Bytecodes::_if_icmpge: | |
| 705 case Bytecodes::_if_icmpgt: | |
| 706 case Bytecodes::_if_icmple: | |
| 707 { | |
| 708 state.spop(); | |
| 709 state.spop(); | |
| 710 int dest_bci = s.get_dest(); | |
| 711 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 712 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 713 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 714 break; | |
| 715 } | |
| 716 case Bytecodes::_if_acmpeq: | |
| 717 case Bytecodes::_if_acmpne: | |
| 718 { | |
| 719 set_method_escape(state.apop()); | |
| 720 set_method_escape(state.apop()); | |
| 721 int dest_bci = s.get_dest(); | |
| 722 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 723 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 724 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 725 break; | |
| 726 } | |
| 727 case Bytecodes::_goto: | |
| 728 { | |
| 729 int dest_bci = s.get_dest(); | |
| 730 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 731 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 732 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 733 fall_through = false; | |
| 734 break; | |
| 735 } | |
| 736 case Bytecodes::_jsr: | |
| 737 { | |
| 738 int dest_bci = s.get_dest(); | |
| 739 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 740 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 741 state.apush(empty_map); | |
| 742 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 743 fall_through = false; | |
| 744 break; | |
| 745 } | |
| 746 case Bytecodes::_ret: | |
| 747 // we don't track the destination of a "ret" instruction | |
| 748 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 749 fall_through = false; | |
| 750 break; | |
| 751 case Bytecodes::_return: | |
| 752 assert(s.next_bci() == limit_bci, "return must end block"); | |
| 753 fall_through = false; | |
| 754 break; | |
| 755 case Bytecodes::_tableswitch: | |
| 756 { | |
| 757 state.spop(); | |
| 758 Bytecode_tableswitch* switch_ = Bytecode_tableswitch_at(s.cur_bcp()); | |
| 759 int len = switch_->length(); | |
| 760 int dest_bci; | |
| 761 for (int i = 0; i < len; i++) { | |
| 762 dest_bci = s.cur_bci() + switch_->dest_offset_at(i); | |
| 763 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 764 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 765 } | |
| 766 dest_bci = s.cur_bci() + switch_->default_offset(); | |
| 767 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 768 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 769 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 770 fall_through = false; | |
| 771 break; | |
| 772 } | |
| 773 case Bytecodes::_lookupswitch: | |
| 774 { | |
| 775 state.spop(); | |
| 776 Bytecode_lookupswitch* switch_ = Bytecode_lookupswitch_at(s.cur_bcp()); | |
| 777 int len = switch_->number_of_pairs(); | |
| 778 int dest_bci; | |
| 779 for (int i = 0; i < len; i++) { | |
| 780 dest_bci = s.cur_bci() + switch_->pair_at(i)->offset(); | |
| 781 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 782 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 783 } | |
| 784 dest_bci = s.cur_bci() + switch_->default_offset(); | |
| 785 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 786 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 787 fall_through = false; | |
| 788 break; | |
| 789 } | |
| 790 case Bytecodes::_ireturn: | |
| 791 case Bytecodes::_freturn: | |
| 792 state.spop(); | |
| 793 fall_through = false; | |
| 794 break; | |
| 795 case Bytecodes::_lreturn: | |
| 796 case Bytecodes::_dreturn: | |
| 797 state.lpop(); | |
| 798 fall_through = false; | |
| 799 break; | |
| 800 case Bytecodes::_areturn: | |
| 801 set_returned(state.apop()); | |
| 802 fall_through = false; | |
| 803 break; | |
| 804 case Bytecodes::_getstatic: | |
| 805 case Bytecodes::_getfield: | |
| 806 { bool will_link; | |
| 807 ciField* field = s.get_field(will_link); | |
| 808 BasicType field_type = field->type()->basic_type(); | |
| 809 if (s.cur_bc() != Bytecodes::_getstatic) { | |
| 810 set_method_escape(state.apop()); | |
| 811 } | |
| 812 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 813 state.apush(unknown_obj); | |
| 814 } else if (type2size[field_type] == 1) { | |
| 815 state.spush(); | |
| 816 } else { | |
| 817 state.lpush(); | |
| 818 } | |
| 819 } | |
| 820 break; | |
| 821 case Bytecodes::_putstatic: | |
| 822 case Bytecodes::_putfield: | |
| 823 { bool will_link; | |
| 824 ciField* field = s.get_field(will_link); | |
| 825 BasicType field_type = field->type()->basic_type(); | |
| 826 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 827 set_global_escape(state.apop()); | |
| 828 } else if (type2size[field_type] == 1) { | |
| 829 state.spop(); | |
| 830 } else { | |
| 831 state.lpop(); | |
| 832 } | |
| 833 if (s.cur_bc() != Bytecodes::_putstatic) { | |
| 834 ArgumentMap p = state.apop(); | |
| 835 set_method_escape(p); | |
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836 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
| 0 | 837 } |
| 838 } | |
| 839 break; | |
| 840 case Bytecodes::_invokevirtual: | |
| 841 case Bytecodes::_invokespecial: | |
| 842 case Bytecodes::_invokestatic: | |
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843 case Bytecodes::_invokedynamic: |
| 0 | 844 case Bytecodes::_invokeinterface: |
| 845 { bool will_link; | |
| 846 ciMethod* target = s.get_method(will_link); | |
| 847 ciKlass* holder = s.get_declared_method_holder(); | |
| 848 invoke(state, s.cur_bc(), target, holder); | |
| 849 ciType* return_type = target->return_type(); | |
| 850 if (!return_type->is_primitive_type()) { | |
| 851 state.apush(unknown_obj); | |
| 852 } else if (return_type->is_one_word()) { | |
| 853 state.spush(); | |
| 854 } else if (return_type->is_two_word()) { | |
| 855 state.lpush(); | |
| 856 } | |
| 857 } | |
| 858 break; | |
| 859 case Bytecodes::_new: | |
| 860 state.apush(allocated_obj); | |
| 861 break; | |
| 862 case Bytecodes::_newarray: | |
| 863 case Bytecodes::_anewarray: | |
| 864 state.spop(); | |
| 865 state.apush(allocated_obj); | |
| 866 break; | |
| 867 case Bytecodes::_multianewarray: | |
| 868 { int i = s.cur_bcp()[3]; | |
| 869 while (i-- > 0) state.spop(); | |
| 870 state.apush(allocated_obj); | |
| 871 } | |
| 872 break; | |
| 873 case Bytecodes::_arraylength: | |
| 874 set_method_escape(state.apop()); | |
| 875 state.spush(); | |
| 876 break; | |
| 877 case Bytecodes::_athrow: | |
| 878 set_global_escape(state.apop()); | |
| 879 fall_through = false; | |
| 880 break; | |
| 881 case Bytecodes::_checkcast: | |
| 882 { ArgumentMap obj = state.apop(); | |
| 883 set_method_escape(obj); | |
| 884 state.apush(obj); | |
| 885 } | |
| 886 break; | |
| 887 case Bytecodes::_instanceof: | |
| 888 set_method_escape(state.apop()); | |
| 889 state.spush(); | |
| 890 break; | |
| 891 case Bytecodes::_monitorenter: | |
| 892 case Bytecodes::_monitorexit: | |
| 893 state.apop(); | |
| 894 break; | |
| 895 case Bytecodes::_wide: | |
| 896 ShouldNotReachHere(); | |
| 897 break; | |
| 898 case Bytecodes::_ifnull: | |
| 899 case Bytecodes::_ifnonnull: | |
| 900 { | |
| 901 set_method_escape(state.apop()); | |
| 902 int dest_bci = s.get_dest(); | |
| 903 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 904 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 905 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 906 break; | |
| 907 } | |
| 908 case Bytecodes::_goto_w: | |
| 909 { | |
| 910 int dest_bci = s.get_far_dest(); | |
| 911 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 912 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 913 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 914 fall_through = false; | |
| 915 break; | |
| 916 } | |
| 917 case Bytecodes::_jsr_w: | |
| 918 { | |
| 919 int dest_bci = s.get_far_dest(); | |
| 920 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 921 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 922 state.apush(empty_map); | |
| 923 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 924 fall_through = false; | |
| 925 break; | |
| 926 } | |
| 927 case Bytecodes::_breakpoint: | |
| 928 break; | |
| 929 default: | |
| 930 ShouldNotReachHere(); | |
| 931 break; | |
| 932 } | |
| 933 | |
| 934 } | |
| 935 if (fall_through) { | |
| 936 int fall_through_bci = s.cur_bci(); | |
| 937 if (fall_through_bci < _method->code_size()) { | |
| 938 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
| 939 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
| 940 } | |
| 941 } | |
| 942 } | |
| 943 | |
| 944 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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945 StateInfo *d_state = blockstates + dest->index(); |
| 0 | 946 int nlocals = _method->max_locals(); |
| 947 | |
| 948 // exceptions may cause transfer of control to handlers in the middle of a | |
| 949 // block, so we don't merge the incoming state of exception handlers | |
| 950 if (dest->is_handler()) | |
| 951 return; | |
| 952 if (!d_state->_initialized ) { | |
| 953 // destination not initialized, just copy | |
| 954 for (int i = 0; i < nlocals; i++) { | |
| 955 d_state->_vars[i] = s_state->_vars[i]; | |
| 956 } | |
| 957 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 958 d_state->_stack[i] = s_state->_stack[i]; | |
| 959 } | |
| 960 d_state->_stack_height = s_state->_stack_height; | |
| 961 d_state->_max_stack = s_state->_max_stack; | |
| 962 d_state->_initialized = true; | |
| 963 } else if (!dest->processed()) { | |
| 964 // we have not yet walked the bytecodes of dest, we can merge | |
| 965 // the states | |
| 966 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 967 for (int i = 0; i < nlocals; i++) { | |
| 968 d_state->_vars[i].set_union(s_state->_vars[i]); | |
| 969 } | |
| 970 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 971 d_state->_stack[i].set_union(s_state->_stack[i]); | |
| 972 } | |
| 973 } else { | |
| 974 // the bytecodes of dest have already been processed, mark any | |
| 975 // arguments in the source state which are not in the dest state | |
| 976 // as global escape. | |
| 977 // Future refinement: we only need to mark these variable to the | |
| 978 // maximum escape of any variables in dest state | |
| 979 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 980 ArgumentMap extra_vars; | |
| 981 for (int i = 0; i < nlocals; i++) { | |
| 982 ArgumentMap t; | |
| 983 t = s_state->_vars[i]; | |
| 984 t.set_difference(d_state->_vars[i]); | |
| 985 extra_vars.set_union(t); | |
| 986 } | |
| 987 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 988 ArgumentMap t; | |
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989 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
| 0 | 990 t.clear(); |
| 991 t = s_state->_stack[i]; | |
| 992 t.set_difference(d_state->_stack[i]); | |
| 993 extra_vars.set_union(t); | |
| 994 } | |
| 995 set_global_escape(extra_vars); | |
| 996 } | |
| 997 } | |
| 998 | |
| 999 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
| 1000 int numblocks = _methodBlocks->num_blocks(); | |
| 1001 int stkSize = _method->max_stack(); | |
| 1002 int numLocals = _method->max_locals(); | |
| 1003 StateInfo state; | |
| 1004 | |
| 1005 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
| 1006 int datasize = datacount * sizeof(ArgumentMap); | |
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1007 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
| 0 | 1008 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
| 1009 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
| 1010 ArgumentMap *dp = statedata; | |
| 1011 state._vars = dp; | |
| 1012 dp += numLocals; | |
| 1013 state._stack = dp; | |
| 1014 dp += stkSize; | |
| 1015 state._initialized = false; | |
| 1016 state._max_stack = stkSize; | |
| 1017 for (int i = 0; i < numblocks; i++) { | |
| 1018 blockstates[i]._vars = dp; | |
| 1019 dp += numLocals; | |
| 1020 blockstates[i]._stack = dp; | |
| 1021 dp += stkSize; | |
| 1022 blockstates[i]._initialized = false; | |
| 1023 blockstates[i]._stack_height = 0; | |
| 1024 blockstates[i]._max_stack = stkSize; | |
| 1025 } | |
| 1026 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
| 1027 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
| 1028 | |
| 1029 _methodBlocks->clear_processed(); | |
| 1030 | |
| 1031 // initialize block 0 state from method signature | |
| 1032 ArgumentMap allVars; // all oop arguments to method | |
| 1033 ciSignature* sig = method()->signature(); | |
| 1034 int j = 0; | |
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1035 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1036 int fb_i = first_blk->index(); |
| 0 | 1037 if (!method()->is_static()) { |
| 1038 // record information for "this" | |
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1039 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1040 allVars.add(j); |
| 1041 j++; | |
| 1042 } | |
| 1043 for (int i = 0; i < sig->count(); i++) { | |
| 1044 ciType* t = sig->type_at(i); | |
| 1045 if (!t->is_primitive_type()) { | |
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1046 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1047 allVars.add(j); |
| 1048 } | |
| 1049 j += t->size(); | |
| 1050 } | |
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1051 blockstates[fb_i]._initialized = true; |
| 0 | 1052 assert(j == _arg_size, "just checking"); |
| 1053 | |
| 1054 ArgumentMap unknown_map; | |
| 1055 unknown_map.add_unknown(); | |
| 1056 | |
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1057 worklist.push(first_blk); |
| 0 | 1058 while(worklist.length() > 0) { |
| 1059 ciBlock *blk = worklist.pop(); | |
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1060 StateInfo *blkState = blockstates + blk->index(); |
| 0 | 1061 if (blk->is_handler() || blk->is_ret_target()) { |
| 1062 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1063 // that any variable could contain any argument |
| 0 | 1064 for (int i = 0; i < numLocals; i++) { |
| 1065 state._vars[i] = allVars; | |
| 1066 } | |
| 1067 if (blk->is_handler()) { | |
| 1068 state._stack_height = 1; | |
| 1069 } else { | |
| 1070 state._stack_height = blkState->_stack_height; | |
| 1071 } | |
| 1072 for (int i = 0; i < state._stack_height; i++) { | |
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1073 // ??? should this be unknown_map ??? |
| 0 | 1074 state._stack[i] = allVars; |
| 1075 } | |
| 1076 } else { | |
| 1077 for (int i = 0; i < numLocals; i++) { | |
| 1078 state._vars[i] = blkState->_vars[i]; | |
| 1079 } | |
| 1080 for (int i = 0; i < blkState->_stack_height; i++) { | |
| 1081 state._stack[i] = blkState->_stack[i]; | |
| 1082 } | |
| 1083 state._stack_height = blkState->_stack_height; | |
| 1084 } | |
| 1085 iterate_one_block(blk, state, successors); | |
| 1086 // if this block has any exception handlers, push them | |
| 1087 // onto successor list | |
| 1088 if (blk->has_handler()) { | |
| 1089 DEBUG_ONLY(int handler_count = 0;) | |
| 1090 int blk_start = blk->start_bci(); | |
| 1091 int blk_end = blk->limit_bci(); | |
| 1092 for (int i = 0; i < numblocks; i++) { | |
| 1093 ciBlock *b = _methodBlocks->block(i); | |
| 1094 if (b->is_handler()) { | |
| 1095 int ex_start = b->ex_start_bci(); | |
| 1096 int ex_end = b->ex_limit_bci(); | |
| 1097 if ((ex_start >= blk_start && ex_start < blk_end) || | |
| 1098 (ex_end > blk_start && ex_end <= blk_end)) { | |
| 1099 successors.push(b); | |
| 1100 } | |
| 1101 DEBUG_ONLY(handler_count++;) | |
| 1102 } | |
| 1103 } | |
| 1104 assert(handler_count > 0, "must find at least one handler"); | |
| 1105 } | |
| 1106 // merge computed variable state with successors | |
| 1107 while(successors.length() > 0) { | |
| 1108 ciBlock *succ = successors.pop(); | |
| 1109 merge_block_states(blockstates, succ, &state); | |
| 1110 if (!succ->processed()) | |
| 1111 worklist.push(succ); | |
| 1112 } | |
| 1113 } | |
| 1114 } | |
| 1115 | |
| 1116 bool BCEscapeAnalyzer::do_analysis() { | |
| 1117 Arena* arena = CURRENT_ENV->arena(); | |
| 1118 // identify basic blocks | |
| 1119 _methodBlocks = _method->get_method_blocks(); | |
| 1120 | |
| 1121 iterate_blocks(arena); | |
| 1122 // TEMPORARY | |
| 1123 return true; | |
| 1124 } | |
| 1125 | |
| 1126 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
| 1127 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
| 1128 | |
| 1129 if (iid == vmIntrinsics::_getClass || | |
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1130 iid == vmIntrinsics::_fillInStackTrace || |
| 0 | 1131 iid == vmIntrinsics::_hashCode) |
| 1132 return iid; | |
| 1133 else | |
| 1134 return vmIntrinsics::_none; | |
| 1135 } | |
| 1136 | |
| 1137 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1138 ArgumentMap arg; |
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1139 arg.clear(); |
| 0 | 1140 switch (iid) { |
| 1141 case vmIntrinsics::_getClass: | |
| 1142 _return_local = false; | |
| 1143 break; | |
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1144 case vmIntrinsics::_fillInStackTrace: |
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1145 arg.set(0); // 'this' |
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1146 set_returned(arg); |
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1147 break; |
| 0 | 1148 case vmIntrinsics::_hashCode: |
| 1149 // initialized state is correct | |
| 1150 break; | |
| 1151 default: | |
| 1152 assert(false, "unexpected intrinsic"); | |
| 1153 } | |
| 1154 return true; | |
| 1155 } | |
| 1156 | |
| 1157 void BCEscapeAnalyzer::initialize() { | |
| 1158 int i; | |
| 1159 | |
| 1160 // clear escape information (method may have been deoptimized) | |
| 1161 methodData()->clear_escape_info(); | |
| 1162 | |
| 1163 // initialize escape state of object parameters | |
| 1164 ciSignature* sig = method()->signature(); | |
| 1165 int j = 0; | |
| 1166 if (!method()->is_static()) { | |
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1167 _arg_local.set(0); |
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1168 _arg_stack.set(0); |
| 0 | 1169 j++; |
| 1170 } | |
| 1171 for (i = 0; i < sig->count(); i++) { | |
| 1172 ciType* t = sig->type_at(i); | |
| 1173 if (!t->is_primitive_type()) { | |
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1174 _arg_local.set(j); |
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1175 _arg_stack.set(j); |
| 0 | 1176 } |
| 1177 j += t->size(); | |
| 1178 } | |
| 1179 assert(j == _arg_size, "just checking"); | |
| 1180 | |
| 1181 // start with optimistic assumption | |
| 1182 ciType *rt = _method->return_type(); | |
| 1183 if (rt->is_primitive_type()) { | |
| 1184 _return_local = false; | |
| 1185 _return_allocated = false; | |
| 1186 } else { | |
| 1187 _return_local = true; | |
| 1188 _return_allocated = true; | |
| 1189 } | |
| 1190 _allocated_escapes = false; | |
|
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1191 _unknown_modified = false; |
| 0 | 1192 } |
| 1193 | |
| 1194 void BCEscapeAnalyzer::clear_escape_info() { | |
| 1195 ciSignature* sig = method()->signature(); | |
| 1196 int arg_count = sig->count(); | |
| 1197 ArgumentMap var; | |
|
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1198 if (!method()->is_static()) { |
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1199 arg_count++; // allow for "this" |
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1200 } |
| 0 | 1201 for (int i = 0; i < arg_count; i++) { |
|
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1202 set_arg_modified(i, OFFSET_ANY, 4); |
| 0 | 1203 var.clear(); |
| 1204 var.set(i); | |
|
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1205 set_modified(var, OFFSET_ANY, 4); |
| 0 | 1206 set_global_escape(var); |
| 1207 } | |
|
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1208 _arg_local.Clear(); |
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1209 _arg_stack.Clear(); |
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1210 _arg_returned.Clear(); |
| 0 | 1211 _return_local = false; |
| 1212 _return_allocated = false; | |
| 1213 _allocated_escapes = true; | |
|
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1214 _unknown_modified = true; |
| 0 | 1215 } |
| 1216 | |
| 1217 | |
| 1218 void BCEscapeAnalyzer::compute_escape_info() { | |
| 1219 int i; | |
| 1220 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
| 1221 | |
| 1222 vmIntrinsics::ID iid = known_intrinsic(); | |
| 1223 | |
| 1224 // check if method can be analyzed | |
| 1225 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
| 1226 || _level > MaxBCEAEstimateLevel | |
| 1227 || method()->code_size() > MaxBCEAEstimateSize)) { | |
| 1228 if (BCEATraceLevel >= 1) { | |
| 1229 tty->print("Skipping method because: "); | |
| 1230 if (method()->is_abstract()) | |
| 1231 tty->print_cr("method is abstract."); | |
| 1232 else if (method()->is_native()) | |
| 1233 tty->print_cr("method is native."); | |
| 1234 else if (!method()->holder()->is_initialized()) | |
| 1235 tty->print_cr("class of method is not initialized."); | |
| 1236 else if (_level > MaxBCEAEstimateLevel) | |
| 1237 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
| 1238 _level, MaxBCEAEstimateLevel); | |
| 1239 else if (method()->code_size() > MaxBCEAEstimateSize) | |
| 1240 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
| 1241 method()->code_size(), MaxBCEAEstimateSize); | |
| 1242 else | |
| 1243 ShouldNotReachHere(); | |
| 1244 } | |
| 1245 clear_escape_info(); | |
| 1246 | |
| 1247 return; | |
| 1248 } | |
| 1249 | |
| 1250 if (BCEATraceLevel >= 1) { | |
| 1251 tty->print("[EA] estimating escape information for"); | |
| 1252 if (iid != vmIntrinsics::_none) | |
| 1253 tty->print(" intrinsic"); | |
| 1254 method()->print_short_name(); | |
| 1255 tty->print_cr(" (%d bytes)", method()->code_size()); | |
| 1256 } | |
| 1257 | |
| 1258 bool success; | |
| 1259 | |
| 1260 initialize(); | |
| 1261 | |
|
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1262 // Do not scan method if it has no object parameters and |
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1263 // does not returns an object (_return_allocated is set in initialize()). |
|
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1264 if (_arg_local.Size() == 0 && !_return_allocated) { |
|
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1265 // Clear all info since method's bytecode was not analysed and |
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1266 // set pessimistic escape information. |
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1267 clear_escape_info(); |
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1268 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1269 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
| 0 | 1270 methodData()->set_eflag(methodDataOopDesc::estimated); |
| 1271 return; | |
| 1272 } | |
| 1273 | |
| 1274 if (iid != vmIntrinsics::_none) | |
| 1275 success = compute_escape_for_intrinsic(iid); | |
| 1276 else { | |
| 1277 success = do_analysis(); | |
| 1278 } | |
| 1279 | |
|
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1280 // don't store interprocedural escape information if it introduces |
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1281 // dependencies or if method data is empty |
| 0 | 1282 // |
| 1283 if (!has_dependencies() && !methodData()->is_empty()) { | |
| 1284 for (i = 0; i < _arg_size; i++) { | |
|
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1285 if (_arg_local.test(i)) { |
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1286 assert(_arg_stack.test(i), "inconsistent escape info"); |
| 0 | 1287 methodData()->set_arg_local(i); |
| 1288 methodData()->set_arg_stack(i); | |
|
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1289 } else if (_arg_stack.test(i)) { |
| 0 | 1290 methodData()->set_arg_stack(i); |
| 1291 } | |
|
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1292 if (_arg_returned.test(i)) { |
| 0 | 1293 methodData()->set_arg_returned(i); |
| 1294 } | |
|
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1295 methodData()->set_arg_modified(i, _arg_modified[i]); |
| 0 | 1296 } |
| 1297 if (_return_local) { | |
| 1298 methodData()->set_eflag(methodDataOopDesc::return_local); | |
| 1299 } | |
|
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1300 if (_return_allocated) { |
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1301 methodData()->set_eflag(methodDataOopDesc::return_allocated); |
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1302 } |
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1303 if (_allocated_escapes) { |
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1304 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1305 } |
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1306 if (_unknown_modified) { |
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1307 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
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1308 } |
| 0 | 1309 methodData()->set_eflag(methodDataOopDesc::estimated); |
| 1310 } | |
| 1311 } | |
| 1312 | |
| 1313 void BCEscapeAnalyzer::read_escape_info() { | |
| 1314 assert(methodData()->has_escape_info(), "no escape info available"); | |
| 1315 | |
| 1316 // read escape information from method descriptor | |
| 1317 for (int i = 0; i < _arg_size; i++) { | |
|
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1318 if (methodData()->is_arg_local(i)) |
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1319 _arg_local.set(i); |
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1320 if (methodData()->is_arg_stack(i)) |
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1321 _arg_stack.set(i); |
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1322 if (methodData()->is_arg_returned(i)) |
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1323 _arg_returned.set(i); |
|
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1324 _arg_modified[i] = methodData()->arg_modified(i); |
| 0 | 1325 } |
| 1326 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
|
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1327 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated); |
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1328 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes); |
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1329 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified); |
| 0 | 1330 |
| 1331 } | |
| 1332 | |
|
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1333 #ifndef PRODUCT |
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1334 void BCEscapeAnalyzer::dump() { |
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1335 tty->print("[EA] estimated escape information for"); |
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1336 method()->print_short_name(); |
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1337 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1338 tty->print(" non-escaping args: "); |
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1339 _arg_local.print_on(tty); |
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1340 tty->print(" stack-allocatable args: "); |
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1341 _arg_stack.print_on(tty); |
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1342 if (_return_local) { |
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1343 tty->print(" returned args: "); |
|
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1344 _arg_returned.print_on(tty); |
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1345 } else if (is_return_allocated()) { |
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1346 tty->print_cr(" return allocated value"); |
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1347 } else { |
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1348 tty->print_cr(" return non-local value"); |
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1349 } |
|
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1350 tty->print(" modified args: "); |
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1351 for (int i = 0; i < _arg_size; i++) { |
|
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1352 if (_arg_modified[i] == 0) |
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1353 tty->print(" 0"); |
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1354 else |
|
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1355 tty->print(" 0x%x", _arg_modified[i]); |
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1356 } |
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1357 tty->cr(); |
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1358 tty->print(" flags: "); |
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1359 if (_return_allocated) |
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1360 tty->print(" return_allocated"); |
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1361 if (_allocated_escapes) |
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1362 tty->print(" allocated_escapes"); |
|
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1363 if (_unknown_modified) |
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1364 tty->print(" unknown_modified"); |
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|
1365 tty->cr(); |
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1366 } |
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1367 #endif |
| 0 | 1368 |
| 1369 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
| 1370 : _conservative(method == NULL || !EstimateArgEscape) | |
|
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1371 , _arena(CURRENT_ENV->arena()) |
| 0 | 1372 , _method(method) |
| 1373 , _methodData(method ? method->method_data() : NULL) | |
| 1374 , _arg_size(method ? method->arg_size() : 0) | |
|
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1375 , _arg_local(_arena) |
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1376 , _arg_stack(_arena) |
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1377 , _arg_returned(_arena) |
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1378 , _dirty(_arena) |
| 0 | 1379 , _return_local(false) |
| 1380 , _return_allocated(false) | |
| 1381 , _allocated_escapes(false) | |
|
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1382 , _unknown_modified(false) |
|
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1383 , _dependencies(_arena, 4, 0, NULL) |
| 0 | 1384 , _parent(parent) |
| 1385 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
| 1386 if (!_conservative) { | |
|
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|
1387 _arg_local.Clear(); |
|
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|
1388 _arg_stack.Clear(); |
|
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|
1389 _arg_returned.Clear(); |
|
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|
1390 _dirty.Clear(); |
| 0 | 1391 Arena* arena = CURRENT_ENV->arena(); |
|
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1392 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1393 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
| 0 | 1394 |
| 1395 if (methodData() == NULL) | |
| 1396 return; | |
| 1397 bool printit = _method->should_print_assembly(); | |
| 1398 if (methodData()->has_escape_info()) { | |
| 1399 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
| 1400 method->holder()->name()->as_utf8(), | |
| 1401 method->name()->as_utf8())); | |
| 1402 read_escape_info(); | |
| 1403 } else { | |
| 1404 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
| 1405 method->holder()->name()->as_utf8(), | |
| 1406 method->name()->as_utf8())); | |
| 1407 | |
| 1408 compute_escape_info(); | |
| 1409 methodData()->update_escape_info(); | |
| 1410 } | |
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1411 #ifndef PRODUCT |
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1412 if (BCEATraceLevel >= 3) { |
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1413 // dump escape information |
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1414 dump(); |
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1415 } |
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1416 #endif |
| 0 | 1417 } |
| 1418 } | |
| 1419 | |
| 1420 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
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1421 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
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1422 // Also record evol dependencies so redefinition of the |
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1423 // callee will trigger recompilation. |
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1424 deps->assert_evol_method(method()); |
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1425 } |
| 0 | 1426 for (int i = 0; i < _dependencies.length(); i+=2) { |
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1427 ciKlass *k = _dependencies.at(i)->as_klass(); |
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1428 ciMethod *m = _dependencies.at(i+1)->as_method(); |
| 0 | 1429 deps->assert_unique_concrete_method(k, m); |
| 1430 } | |
| 1431 } |