Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 2165:a7367756024b
Merge
| author | twisti |
|---|---|
| date | Fri, 21 Jan 2011 01:16:13 -0800 |
| parents | bb2c2878f134 8012aa3ccede |
| children | 548597e74aa4 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2142 | 2 * Copyright (c) 2005, 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 "ci/bcEscapeAnalyzer.hpp" | |
| 27 #include "ci/ciConstant.hpp" | |
| 28 #include "ci/ciField.hpp" | |
| 29 #include "ci/ciMethodBlocks.hpp" | |
| 30 #include "ci/ciStreams.hpp" | |
| 31 #include "interpreter/bytecode.hpp" | |
| 32 #include "utilities/bitMap.inline.hpp" | |
| 0 | 33 |
| 34 | |
| 35 | |
| 36 #ifndef PRODUCT | |
| 37 #define TRACE_BCEA(level, code) \ | |
| 38 if (EstimateArgEscape && BCEATraceLevel >= level) { \ | |
| 39 code; \ | |
| 40 } | |
| 41 #else | |
| 42 #define TRACE_BCEA(level, code) | |
| 43 #endif | |
| 44 | |
| 45 // Maintain a map of which aguments a local variable or | |
| 46 // stack slot may contain. In addition to tracking | |
| 47 // arguments, it tracks two special values, "allocated" | |
| 48 // which represents any object allocated in the current | |
| 49 // method, and "unknown" which is any other object. | |
| 50 // Up to 30 arguments are handled, with the last one | |
| 51 // representing summary information for any extra arguments | |
| 52 class BCEscapeAnalyzer::ArgumentMap { | |
| 53 uint _bits; | |
| 54 enum {MAXBIT = 29, | |
| 55 ALLOCATED = 1, | |
| 56 UNKNOWN = 2}; | |
| 57 | |
| 58 uint int_to_bit(uint e) const { | |
| 59 if (e > MAXBIT) | |
| 60 e = MAXBIT; | |
| 61 return (1 << (e + 2)); | |
| 62 } | |
| 63 | |
| 64 public: | |
| 65 ArgumentMap() { _bits = 0;} | |
| 66 void set_bits(uint bits) { _bits = bits;} | |
| 67 uint get_bits() const { return _bits;} | |
| 68 void clear() { _bits = 0;} | |
| 69 void set_all() { _bits = ~0u; } | |
| 70 bool is_empty() const { return _bits == 0; } | |
| 71 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } | |
| 72 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } | |
| 73 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } | |
| 74 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } | |
| 75 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } | |
| 76 void set(uint var) { _bits = int_to_bit(var); } | |
| 77 void add(uint var) { _bits |= int_to_bit(var); } | |
| 78 void add_unknown() { _bits = UNKNOWN; } | |
| 79 void add_allocated() { _bits = ALLOCATED; } | |
| 80 void set_union(const ArgumentMap &am) { _bits |= am._bits; } | |
| 81 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } | |
| 82 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } | |
| 83 void operator=(const ArgumentMap &am) { _bits = am._bits; } | |
| 84 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } | |
| 85 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } | |
| 86 }; | |
| 87 | |
| 88 class BCEscapeAnalyzer::StateInfo { | |
| 89 public: | |
| 90 ArgumentMap *_vars; | |
| 91 ArgumentMap *_stack; | |
| 92 short _stack_height; | |
| 93 short _max_stack; | |
| 94 bool _initialized; | |
| 95 ArgumentMap empty_map; | |
| 96 | |
| 97 StateInfo() { | |
| 98 empty_map.clear(); | |
| 99 } | |
| 100 | |
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101 ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } |
| 0 | 102 ArgumentMap apop() { return raw_pop(); } |
| 103 void spop() { raw_pop(); } | |
| 104 void lpop() { spop(); spop(); } | |
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105 void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } |
| 0 | 106 void apush(ArgumentMap i) { raw_push(i); } |
| 107 void spush() { raw_push(empty_map); } | |
| 108 void lpush() { spush(); spush(); } | |
| 109 | |
| 110 }; | |
| 111 | |
| 112 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { | |
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113 for (int i = 0; i < _arg_size; i++) { |
| 0 | 114 if (vars.contains(i)) |
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115 _arg_returned.set(i); |
| 0 | 116 } |
| 117 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); | |
| 118 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); | |
| 119 } | |
| 120 | |
| 121 // return true if any element of vars is an argument | |
| 122 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { | |
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123 for (int i = 0; i < _arg_size; i++) { |
| 0 | 124 if (vars.contains(i)) |
| 125 return true; | |
| 126 } | |
| 127 return false; | |
| 128 } | |
| 129 | |
| 130 // return true if any element of vars is an arg_stack argument | |
| 131 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ | |
| 132 if (_conservative) | |
| 133 return true; | |
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134 for (int i = 0; i < _arg_size; i++) { |
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135 if (vars.contains(i) && _arg_stack.test(i)) |
| 0 | 136 return true; |
| 137 } | |
| 138 return false; | |
| 139 } | |
| 140 | |
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141 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { |
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142 for (int i = 0; i < _arg_size; i++) { |
| 0 | 143 if (vars.contains(i)) { |
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144 bm >>= i; |
| 0 | 145 } |
| 146 } | |
| 147 } | |
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148 |
| 0 | 149 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { |
| 150 clear_bits(vars, _arg_local); | |
| 151 } | |
| 152 | |
| 153 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars) { | |
| 154 clear_bits(vars, _arg_local); | |
| 155 clear_bits(vars, _arg_stack); | |
| 156 if (vars.contains_allocated()) | |
| 157 _allocated_escapes = true; | |
| 158 } | |
| 159 | |
| 160 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
| 161 clear_bits(vars, _dirty); | |
| 162 } | |
| 163 | |
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164 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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165 |
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166 for (int i = 0; i < _arg_size; i++) { |
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167 if (vars.contains(i)) { |
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168 set_arg_modified(i, offs, size); |
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169 } |
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170 } |
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171 if (vars.contains_unknown()) |
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172 _unknown_modified = true; |
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173 } |
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174 |
| 0 | 175 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
| 176 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
| 177 if (scope->method() == callee) { | |
| 178 return true; | |
| 179 } | |
| 180 } | |
| 181 return false; | |
| 182 } | |
| 183 | |
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184 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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185 if (offset == OFFSET_ANY) |
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186 return _arg_modified[arg] != 0; |
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187 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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188 bool modified = false; |
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189 int l = offset / HeapWordSize; |
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190 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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191 if (l > ARG_OFFSET_MAX) |
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192 l = ARG_OFFSET_MAX; |
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193 if (h > ARG_OFFSET_MAX+1) |
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194 h = ARG_OFFSET_MAX + 1; |
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195 for (int i = l; i < h; i++) { |
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196 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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197 } |
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198 return modified; |
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199 } |
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200 |
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201 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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202 if (offset == OFFSET_ANY) { |
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203 _arg_modified[arg] = (uint) -1; |
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204 return; |
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205 } |
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206 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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207 int l = offset / HeapWordSize; |
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208 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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209 if (l > ARG_OFFSET_MAX) |
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210 l = ARG_OFFSET_MAX; |
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211 if (h > ARG_OFFSET_MAX+1) |
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212 h = ARG_OFFSET_MAX + 1; |
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213 for (int i = l; i < h; i++) { |
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214 _arg_modified[arg] |= (1 << i); |
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215 } |
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216 } |
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217 |
| 0 | 218 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
| 219 int i; | |
| 220 | |
| 221 // retrieve information about the callee | |
| 222 ciInstanceKlass* klass = target->holder(); | |
| 223 ciInstanceKlass* calling_klass = method()->holder(); | |
| 224 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
| 225 ciInstanceKlass* actual_recv = callee_holder; | |
| 226 | |
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227 // some methods are obviously bindable without any type checks so |
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228 // convert them directly to an invokespecial. |
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229 if (target->is_loaded() && !target->is_abstract() && |
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230 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) { |
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231 code = Bytecodes::_invokespecial; |
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232 } |
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233 |
| 0 | 234 // compute size of arguments |
| 235 int arg_size = target->arg_size(); | |
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236 if (code == Bytecodes::_invokedynamic) { |
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237 assert(!target->is_static(), "receiver explicit in method"); |
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238 arg_size--; // implicit, not really on stack |
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239 } |
| 0 | 240 if (!target->is_loaded() && code == Bytecodes::_invokestatic) { |
| 241 arg_size--; | |
| 242 } | |
| 243 int arg_base = MAX2(state._stack_height - arg_size, 0); | |
| 244 | |
| 245 // direct recursive calls are skipped if they can be bound statically without introducing | |
| 246 // dependencies and if parameters are passed at the same position as in the current method | |
| 247 // other calls are skipped if there are no unescaped arguments passed to them | |
| 248 bool directly_recursive = (method() == target) && | |
| 249 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
| 250 | |
| 251 // check if analysis of callee can safely be skipped | |
| 252 bool skip_callee = true; | |
| 253 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
| 254 ArgumentMap arg = state._stack[i]; | |
| 255 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
| 256 } | |
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257 // For now we conservatively skip invokedynamic. |
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258 if (code == Bytecodes::_invokedynamic) { |
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259 skip_callee = true; |
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260 } |
| 0 | 261 if (skip_callee) { |
| 262 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
| 263 for (i = 0; i < arg_size; i++) { | |
| 264 set_method_escape(state.raw_pop()); | |
| 265 } | |
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266 _unknown_modified = true; // assume the worst since we don't analyze the called method |
| 0 | 267 return; |
| 268 } | |
| 269 | |
| 270 // determine actual method (use CHA if necessary) | |
| 271 ciMethod* inline_target = NULL; | |
| 272 if (target->is_loaded() && klass->is_loaded() | |
| 273 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
| 274 && target->will_link(klass, callee_holder, code)) { | |
| 275 if (code == Bytecodes::_invokestatic | |
| 276 || code == Bytecodes::_invokespecial | |
| 277 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
| 278 inline_target = target; | |
| 279 } else { | |
| 280 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
| 285 // analyze callee | |
| 286 BCEscapeAnalyzer analyzer(inline_target, this); | |
| 287 | |
| 288 // adjust escape state of actual parameters | |
| 289 bool must_record_dependencies = false; | |
| 290 for (i = arg_size - 1; i >= 0; i--) { | |
| 291 ArgumentMap arg = state.raw_pop(); | |
| 292 if (!is_argument(arg)) | |
| 293 continue; | |
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294 for (int j = 0; j < _arg_size; j++) { |
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295 if (arg.contains(j)) { |
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296 _arg_modified[j] |= analyzer._arg_modified[i]; |
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297 } |
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298 } |
| 0 | 299 if (!is_arg_stack(arg)) { |
| 300 // arguments have already been recognized as escaping | |
| 301 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
| 302 set_method_escape(arg); | |
| 303 must_record_dependencies = true; | |
| 304 } else { | |
| 305 set_global_escape(arg); | |
| 306 } | |
| 307 } | |
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308 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
| 0 | 309 |
| 310 // record dependencies if at least one parameter retained stack-allocatable | |
| 311 if (must_record_dependencies) { | |
| 312 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
| 313 _dependencies.append(actual_recv); | |
| 314 _dependencies.append(inline_target); | |
| 315 } | |
| 316 _dependencies.appendAll(analyzer.dependencies()); | |
| 317 } | |
| 318 } else { | |
| 319 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
| 320 target->name()->as_utf8())); | |
| 321 // conservatively mark all actual parameters as escaping globally | |
| 322 for (i = 0; i < arg_size; i++) { | |
| 323 ArgumentMap arg = state.raw_pop(); | |
| 324 if (!is_argument(arg)) | |
| 325 continue; | |
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326 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 327 set_global_escape(arg); |
| 328 } | |
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329 _unknown_modified = true; // assume the worst since we don't know the called method |
| 0 | 330 } |
| 331 } | |
| 332 | |
| 333 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
| 334 return ((~arg_set1) | arg_set2) == 0; | |
| 335 } | |
| 336 | |
| 337 | |
| 338 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
| 339 | |
| 340 blk->set_processed(); | |
| 341 ciBytecodeStream s(method()); | |
| 342 int limit_bci = blk->limit_bci(); | |
| 343 bool fall_through = false; | |
| 344 ArgumentMap allocated_obj; | |
| 345 allocated_obj.add_allocated(); | |
| 346 ArgumentMap unknown_obj; | |
| 347 unknown_obj.add_unknown(); | |
| 348 ArgumentMap empty_map; | |
| 349 | |
| 350 s.reset_to_bci(blk->start_bci()); | |
| 351 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
| 352 fall_through = true; | |
| 353 switch (s.cur_bc()) { | |
| 354 case Bytecodes::_nop: | |
| 355 break; | |
| 356 case Bytecodes::_aconst_null: | |
| 357 state.apush(empty_map); | |
| 358 break; | |
| 359 case Bytecodes::_iconst_m1: | |
| 360 case Bytecodes::_iconst_0: | |
| 361 case Bytecodes::_iconst_1: | |
| 362 case Bytecodes::_iconst_2: | |
| 363 case Bytecodes::_iconst_3: | |
| 364 case Bytecodes::_iconst_4: | |
| 365 case Bytecodes::_iconst_5: | |
| 366 case Bytecodes::_fconst_0: | |
| 367 case Bytecodes::_fconst_1: | |
| 368 case Bytecodes::_fconst_2: | |
| 369 case Bytecodes::_bipush: | |
| 370 case Bytecodes::_sipush: | |
| 371 state.spush(); | |
| 372 break; | |
| 373 case Bytecodes::_lconst_0: | |
| 374 case Bytecodes::_lconst_1: | |
| 375 case Bytecodes::_dconst_0: | |
| 376 case Bytecodes::_dconst_1: | |
| 377 state.lpush(); | |
| 378 break; | |
| 379 case Bytecodes::_ldc: | |
| 380 case Bytecodes::_ldc_w: | |
| 381 case Bytecodes::_ldc2_w: | |
|
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382 { |
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383 // Avoid calling get_constant() which will try to allocate |
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384 // unloaded constant. We need only constant's type. |
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385 int index = s.get_constant_pool_index(); |
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386 constantTag tag = s.get_constant_pool_tag(index); |
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387 if (tag.is_long() || tag.is_double()) { |
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388 // Only longs and doubles use 2 stack slots. |
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389 state.lpush(); |
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390 } else { |
| 0 | 391 state.spush(); |
| 392 } | |
| 393 break; | |
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394 } |
| 0 | 395 case Bytecodes::_aload: |
| 396 state.apush(state._vars[s.get_index()]); | |
| 397 break; | |
| 398 case Bytecodes::_iload: | |
| 399 case Bytecodes::_fload: | |
| 400 case Bytecodes::_iload_0: | |
| 401 case Bytecodes::_iload_1: | |
| 402 case Bytecodes::_iload_2: | |
| 403 case Bytecodes::_iload_3: | |
| 404 case Bytecodes::_fload_0: | |
| 405 case Bytecodes::_fload_1: | |
| 406 case Bytecodes::_fload_2: | |
| 407 case Bytecodes::_fload_3: | |
| 408 state.spush(); | |
| 409 break; | |
| 410 case Bytecodes::_lload: | |
| 411 case Bytecodes::_dload: | |
| 412 case Bytecodes::_lload_0: | |
| 413 case Bytecodes::_lload_1: | |
| 414 case Bytecodes::_lload_2: | |
| 415 case Bytecodes::_lload_3: | |
| 416 case Bytecodes::_dload_0: | |
| 417 case Bytecodes::_dload_1: | |
| 418 case Bytecodes::_dload_2: | |
| 419 case Bytecodes::_dload_3: | |
| 420 state.lpush(); | |
| 421 break; | |
| 422 case Bytecodes::_aload_0: | |
| 423 state.apush(state._vars[0]); | |
| 424 break; | |
| 425 case Bytecodes::_aload_1: | |
| 426 state.apush(state._vars[1]); | |
| 427 break; | |
| 428 case Bytecodes::_aload_2: | |
| 429 state.apush(state._vars[2]); | |
| 430 break; | |
| 431 case Bytecodes::_aload_3: | |
| 432 state.apush(state._vars[3]); | |
| 433 break; | |
| 434 case Bytecodes::_iaload: | |
| 435 case Bytecodes::_faload: | |
| 436 case Bytecodes::_baload: | |
| 437 case Bytecodes::_caload: | |
| 438 case Bytecodes::_saload: | |
| 439 state.spop(); | |
| 440 set_method_escape(state.apop()); | |
| 441 state.spush(); | |
| 442 break; | |
| 443 case Bytecodes::_laload: | |
| 444 case Bytecodes::_daload: | |
| 445 state.spop(); | |
| 446 set_method_escape(state.apop()); | |
| 447 state.lpush(); | |
| 448 break; | |
| 449 case Bytecodes::_aaload: | |
| 450 { state.spop(); | |
| 451 ArgumentMap array = state.apop(); | |
| 452 set_method_escape(array); | |
| 453 state.apush(unknown_obj); | |
| 454 set_dirty(array); | |
| 455 } | |
| 456 break; | |
| 457 case Bytecodes::_istore: | |
| 458 case Bytecodes::_fstore: | |
| 459 case Bytecodes::_istore_0: | |
| 460 case Bytecodes::_istore_1: | |
| 461 case Bytecodes::_istore_2: | |
| 462 case Bytecodes::_istore_3: | |
| 463 case Bytecodes::_fstore_0: | |
| 464 case Bytecodes::_fstore_1: | |
| 465 case Bytecodes::_fstore_2: | |
| 466 case Bytecodes::_fstore_3: | |
| 467 state.spop(); | |
| 468 break; | |
| 469 case Bytecodes::_lstore: | |
| 470 case Bytecodes::_dstore: | |
| 471 case Bytecodes::_lstore_0: | |
| 472 case Bytecodes::_lstore_1: | |
| 473 case Bytecodes::_lstore_2: | |
| 474 case Bytecodes::_lstore_3: | |
| 475 case Bytecodes::_dstore_0: | |
| 476 case Bytecodes::_dstore_1: | |
| 477 case Bytecodes::_dstore_2: | |
| 478 case Bytecodes::_dstore_3: | |
| 479 state.lpop(); | |
| 480 break; | |
| 481 case Bytecodes::_astore: | |
| 482 state._vars[s.get_index()] = state.apop(); | |
| 483 break; | |
| 484 case Bytecodes::_astore_0: | |
| 485 state._vars[0] = state.apop(); | |
| 486 break; | |
| 487 case Bytecodes::_astore_1: | |
| 488 state._vars[1] = state.apop(); | |
| 489 break; | |
| 490 case Bytecodes::_astore_2: | |
| 491 state._vars[2] = state.apop(); | |
| 492 break; | |
| 493 case Bytecodes::_astore_3: | |
| 494 state._vars[3] = state.apop(); | |
| 495 break; | |
| 496 case Bytecodes::_iastore: | |
| 497 case Bytecodes::_fastore: | |
| 498 case Bytecodes::_bastore: | |
| 499 case Bytecodes::_castore: | |
| 500 case Bytecodes::_sastore: | |
| 501 { | |
| 502 state.spop(); | |
| 503 state.spop(); | |
| 504 ArgumentMap arr = state.apop(); | |
| 505 set_method_escape(arr); | |
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506 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 507 break; |
| 508 } | |
| 509 case Bytecodes::_lastore: | |
| 510 case Bytecodes::_dastore: | |
| 511 { | |
| 512 state.lpop(); | |
| 513 state.spop(); | |
| 514 ArgumentMap arr = state.apop(); | |
| 515 set_method_escape(arr); | |
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516 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
| 0 | 517 break; |
| 518 } | |
| 519 case Bytecodes::_aastore: | |
| 520 { | |
| 521 set_global_escape(state.apop()); | |
| 522 state.spop(); | |
| 523 ArgumentMap arr = state.apop(); | |
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524 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
| 0 | 525 break; |
| 526 } | |
| 527 case Bytecodes::_pop: | |
| 528 state.raw_pop(); | |
| 529 break; | |
| 530 case Bytecodes::_pop2: | |
| 531 state.raw_pop(); | |
| 532 state.raw_pop(); | |
| 533 break; | |
| 534 case Bytecodes::_dup: | |
| 535 { ArgumentMap w1 = state.raw_pop(); | |
| 536 state.raw_push(w1); | |
| 537 state.raw_push(w1); | |
| 538 } | |
| 539 break; | |
| 540 case Bytecodes::_dup_x1: | |
| 541 { ArgumentMap w1 = state.raw_pop(); | |
| 542 ArgumentMap w2 = state.raw_pop(); | |
| 543 state.raw_push(w1); | |
| 544 state.raw_push(w2); | |
| 545 state.raw_push(w1); | |
| 546 } | |
| 547 break; | |
| 548 case Bytecodes::_dup_x2: | |
| 549 { ArgumentMap w1 = state.raw_pop(); | |
| 550 ArgumentMap w2 = state.raw_pop(); | |
| 551 ArgumentMap w3 = state.raw_pop(); | |
| 552 state.raw_push(w1); | |
| 553 state.raw_push(w3); | |
| 554 state.raw_push(w2); | |
| 555 state.raw_push(w1); | |
| 556 } | |
| 557 break; | |
| 558 case Bytecodes::_dup2: | |
| 559 { ArgumentMap w1 = state.raw_pop(); | |
| 560 ArgumentMap w2 = state.raw_pop(); | |
| 561 state.raw_push(w2); | |
| 562 state.raw_push(w1); | |
| 563 state.raw_push(w2); | |
| 564 state.raw_push(w1); | |
| 565 } | |
| 566 break; | |
| 567 case Bytecodes::_dup2_x1: | |
| 568 { ArgumentMap w1 = state.raw_pop(); | |
| 569 ArgumentMap w2 = state.raw_pop(); | |
| 570 ArgumentMap w3 = state.raw_pop(); | |
| 571 state.raw_push(w2); | |
| 572 state.raw_push(w1); | |
| 573 state.raw_push(w3); | |
| 574 state.raw_push(w2); | |
| 575 state.raw_push(w1); | |
| 576 } | |
| 577 break; | |
| 578 case Bytecodes::_dup2_x2: | |
| 579 { ArgumentMap w1 = state.raw_pop(); | |
| 580 ArgumentMap w2 = state.raw_pop(); | |
| 581 ArgumentMap w3 = state.raw_pop(); | |
| 582 ArgumentMap w4 = state.raw_pop(); | |
| 583 state.raw_push(w2); | |
| 584 state.raw_push(w1); | |
| 585 state.raw_push(w4); | |
| 586 state.raw_push(w3); | |
| 587 state.raw_push(w2); | |
| 588 state.raw_push(w1); | |
| 589 } | |
| 590 break; | |
| 591 case Bytecodes::_swap: | |
| 592 { ArgumentMap w1 = state.raw_pop(); | |
| 593 ArgumentMap w2 = state.raw_pop(); | |
| 594 state.raw_push(w1); | |
| 595 state.raw_push(w2); | |
| 596 } | |
| 597 break; | |
| 598 case Bytecodes::_iadd: | |
| 599 case Bytecodes::_fadd: | |
| 600 case Bytecodes::_isub: | |
| 601 case Bytecodes::_fsub: | |
| 602 case Bytecodes::_imul: | |
| 603 case Bytecodes::_fmul: | |
| 604 case Bytecodes::_idiv: | |
| 605 case Bytecodes::_fdiv: | |
| 606 case Bytecodes::_irem: | |
| 607 case Bytecodes::_frem: | |
| 608 case Bytecodes::_iand: | |
| 609 case Bytecodes::_ior: | |
| 610 case Bytecodes::_ixor: | |
| 611 state.spop(); | |
| 612 state.spop(); | |
| 613 state.spush(); | |
| 614 break; | |
| 615 case Bytecodes::_ladd: | |
| 616 case Bytecodes::_dadd: | |
| 617 case Bytecodes::_lsub: | |
| 618 case Bytecodes::_dsub: | |
| 619 case Bytecodes::_lmul: | |
| 620 case Bytecodes::_dmul: | |
| 621 case Bytecodes::_ldiv: | |
| 622 case Bytecodes::_ddiv: | |
| 623 case Bytecodes::_lrem: | |
| 624 case Bytecodes::_drem: | |
| 625 case Bytecodes::_land: | |
| 626 case Bytecodes::_lor: | |
| 627 case Bytecodes::_lxor: | |
| 628 state.lpop(); | |
| 629 state.lpop(); | |
| 630 state.lpush(); | |
| 631 break; | |
| 632 case Bytecodes::_ishl: | |
| 633 case Bytecodes::_ishr: | |
| 634 case Bytecodes::_iushr: | |
| 635 state.spop(); | |
| 636 state.spop(); | |
| 637 state.spush(); | |
| 638 break; | |
| 639 case Bytecodes::_lshl: | |
| 640 case Bytecodes::_lshr: | |
| 641 case Bytecodes::_lushr: | |
| 642 state.spop(); | |
| 643 state.lpop(); | |
| 644 state.lpush(); | |
| 645 break; | |
| 646 case Bytecodes::_ineg: | |
| 647 case Bytecodes::_fneg: | |
| 648 state.spop(); | |
| 649 state.spush(); | |
| 650 break; | |
| 651 case Bytecodes::_lneg: | |
| 652 case Bytecodes::_dneg: | |
| 653 state.lpop(); | |
| 654 state.lpush(); | |
| 655 break; | |
| 656 case Bytecodes::_iinc: | |
| 657 break; | |
| 658 case Bytecodes::_i2l: | |
| 659 case Bytecodes::_i2d: | |
| 660 case Bytecodes::_f2l: | |
| 661 case Bytecodes::_f2d: | |
| 662 state.spop(); | |
| 663 state.lpush(); | |
| 664 break; | |
| 665 case Bytecodes::_i2f: | |
| 666 case Bytecodes::_f2i: | |
| 667 state.spop(); | |
| 668 state.spush(); | |
| 669 break; | |
| 670 case Bytecodes::_l2i: | |
| 671 case Bytecodes::_l2f: | |
| 672 case Bytecodes::_d2i: | |
| 673 case Bytecodes::_d2f: | |
| 674 state.lpop(); | |
| 675 state.spush(); | |
| 676 break; | |
| 677 case Bytecodes::_l2d: | |
| 678 case Bytecodes::_d2l: | |
| 679 state.lpop(); | |
| 680 state.lpush(); | |
| 681 break; | |
| 682 case Bytecodes::_i2b: | |
| 683 case Bytecodes::_i2c: | |
| 684 case Bytecodes::_i2s: | |
| 685 state.spop(); | |
| 686 state.spush(); | |
| 687 break; | |
| 688 case Bytecodes::_lcmp: | |
| 689 case Bytecodes::_dcmpl: | |
| 690 case Bytecodes::_dcmpg: | |
| 691 state.lpop(); | |
| 692 state.lpop(); | |
| 693 state.spush(); | |
| 694 break; | |
| 695 case Bytecodes::_fcmpl: | |
| 696 case Bytecodes::_fcmpg: | |
| 697 state.spop(); | |
| 698 state.spop(); | |
| 699 state.spush(); | |
| 700 break; | |
| 701 case Bytecodes::_ifeq: | |
| 702 case Bytecodes::_ifne: | |
| 703 case Bytecodes::_iflt: | |
| 704 case Bytecodes::_ifge: | |
| 705 case Bytecodes::_ifgt: | |
| 706 case Bytecodes::_ifle: | |
| 707 { | |
| 708 state.spop(); | |
| 709 int dest_bci = s.get_dest(); | |
| 710 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 711 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 712 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 713 break; | |
| 714 } | |
| 715 case Bytecodes::_if_icmpeq: | |
| 716 case Bytecodes::_if_icmpne: | |
| 717 case Bytecodes::_if_icmplt: | |
| 718 case Bytecodes::_if_icmpge: | |
| 719 case Bytecodes::_if_icmpgt: | |
| 720 case Bytecodes::_if_icmple: | |
| 721 { | |
| 722 state.spop(); | |
| 723 state.spop(); | |
| 724 int dest_bci = s.get_dest(); | |
| 725 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 726 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 727 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 728 break; | |
| 729 } | |
| 730 case Bytecodes::_if_acmpeq: | |
| 731 case Bytecodes::_if_acmpne: | |
| 732 { | |
| 733 set_method_escape(state.apop()); | |
| 734 set_method_escape(state.apop()); | |
| 735 int dest_bci = s.get_dest(); | |
| 736 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 737 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 738 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 739 break; | |
| 740 } | |
| 741 case Bytecodes::_goto: | |
| 742 { | |
| 743 int dest_bci = s.get_dest(); | |
| 744 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 745 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 746 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 747 fall_through = false; | |
| 748 break; | |
| 749 } | |
| 750 case Bytecodes::_jsr: | |
| 751 { | |
| 752 int dest_bci = s.get_dest(); | |
| 753 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 754 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 755 state.apush(empty_map); | |
| 756 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 757 fall_through = false; | |
| 758 break; | |
| 759 } | |
| 760 case Bytecodes::_ret: | |
| 761 // we don't track the destination of a "ret" instruction | |
| 762 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 763 fall_through = false; | |
| 764 break; | |
| 765 case Bytecodes::_return: | |
| 766 assert(s.next_bci() == limit_bci, "return must end block"); | |
| 767 fall_through = false; | |
| 768 break; | |
| 769 case Bytecodes::_tableswitch: | |
| 770 { | |
| 771 state.spop(); | |
| 2142 | 772 Bytecode_tableswitch sw(&s); |
| 773 int len = sw.length(); | |
| 0 | 774 int dest_bci; |
| 775 for (int i = 0; i < len; i++) { | |
| 2142 | 776 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
| 0 | 777 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 778 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 779 } | |
| 2142 | 780 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 781 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 782 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 783 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 784 fall_through = false; | |
| 785 break; | |
| 786 } | |
| 787 case Bytecodes::_lookupswitch: | |
| 788 { | |
| 789 state.spop(); | |
| 2142 | 790 Bytecode_lookupswitch sw(&s); |
| 791 int len = sw.number_of_pairs(); | |
| 0 | 792 int dest_bci; |
| 793 for (int i = 0; i < len; i++) { | |
| 2142 | 794 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
| 0 | 795 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 796 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 797 } | |
| 2142 | 798 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 799 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 800 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 801 fall_through = false; | |
| 802 break; | |
| 803 } | |
| 804 case Bytecodes::_ireturn: | |
| 805 case Bytecodes::_freturn: | |
| 806 state.spop(); | |
| 807 fall_through = false; | |
| 808 break; | |
| 809 case Bytecodes::_lreturn: | |
| 810 case Bytecodes::_dreturn: | |
| 811 state.lpop(); | |
| 812 fall_through = false; | |
| 813 break; | |
| 814 case Bytecodes::_areturn: | |
| 815 set_returned(state.apop()); | |
| 816 fall_through = false; | |
| 817 break; | |
| 818 case Bytecodes::_getstatic: | |
| 819 case Bytecodes::_getfield: | |
| 820 { bool will_link; | |
| 821 ciField* field = s.get_field(will_link); | |
| 822 BasicType field_type = field->type()->basic_type(); | |
| 823 if (s.cur_bc() != Bytecodes::_getstatic) { | |
| 824 set_method_escape(state.apop()); | |
| 825 } | |
| 826 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 827 state.apush(unknown_obj); | |
| 828 } else if (type2size[field_type] == 1) { | |
| 829 state.spush(); | |
| 830 } else { | |
| 831 state.lpush(); | |
| 832 } | |
| 833 } | |
| 834 break; | |
| 835 case Bytecodes::_putstatic: | |
| 836 case Bytecodes::_putfield: | |
| 837 { bool will_link; | |
| 838 ciField* field = s.get_field(will_link); | |
| 839 BasicType field_type = field->type()->basic_type(); | |
| 840 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 841 set_global_escape(state.apop()); | |
| 842 } else if (type2size[field_type] == 1) { | |
| 843 state.spop(); | |
| 844 } else { | |
| 845 state.lpop(); | |
| 846 } | |
| 847 if (s.cur_bc() != Bytecodes::_putstatic) { | |
| 848 ArgumentMap p = state.apop(); | |
| 849 set_method_escape(p); | |
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850 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
| 0 | 851 } |
| 852 } | |
| 853 break; | |
| 854 case Bytecodes::_invokevirtual: | |
| 855 case Bytecodes::_invokespecial: | |
| 856 case Bytecodes::_invokestatic: | |
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857 case Bytecodes::_invokedynamic: |
| 0 | 858 case Bytecodes::_invokeinterface: |
| 859 { bool will_link; | |
| 860 ciMethod* target = s.get_method(will_link); | |
| 861 ciKlass* holder = s.get_declared_method_holder(); | |
| 862 invoke(state, s.cur_bc(), target, holder); | |
| 863 ciType* return_type = target->return_type(); | |
| 864 if (!return_type->is_primitive_type()) { | |
| 865 state.apush(unknown_obj); | |
| 866 } else if (return_type->is_one_word()) { | |
| 867 state.spush(); | |
| 868 } else if (return_type->is_two_word()) { | |
| 869 state.lpush(); | |
| 870 } | |
| 871 } | |
| 872 break; | |
| 873 case Bytecodes::_new: | |
| 874 state.apush(allocated_obj); | |
| 875 break; | |
| 876 case Bytecodes::_newarray: | |
| 877 case Bytecodes::_anewarray: | |
| 878 state.spop(); | |
| 879 state.apush(allocated_obj); | |
| 880 break; | |
| 881 case Bytecodes::_multianewarray: | |
| 882 { int i = s.cur_bcp()[3]; | |
| 883 while (i-- > 0) state.spop(); | |
| 884 state.apush(allocated_obj); | |
| 885 } | |
| 886 break; | |
| 887 case Bytecodes::_arraylength: | |
| 888 set_method_escape(state.apop()); | |
| 889 state.spush(); | |
| 890 break; | |
| 891 case Bytecodes::_athrow: | |
| 892 set_global_escape(state.apop()); | |
| 893 fall_through = false; | |
| 894 break; | |
| 895 case Bytecodes::_checkcast: | |
| 896 { ArgumentMap obj = state.apop(); | |
| 897 set_method_escape(obj); | |
| 898 state.apush(obj); | |
| 899 } | |
| 900 break; | |
| 901 case Bytecodes::_instanceof: | |
| 902 set_method_escape(state.apop()); | |
| 903 state.spush(); | |
| 904 break; | |
| 905 case Bytecodes::_monitorenter: | |
| 906 case Bytecodes::_monitorexit: | |
| 907 state.apop(); | |
| 908 break; | |
| 909 case Bytecodes::_wide: | |
| 910 ShouldNotReachHere(); | |
| 911 break; | |
| 912 case Bytecodes::_ifnull: | |
| 913 case Bytecodes::_ifnonnull: | |
| 914 { | |
| 915 set_method_escape(state.apop()); | |
| 916 int dest_bci = s.get_dest(); | |
| 917 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 918 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 919 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 920 break; | |
| 921 } | |
| 922 case Bytecodes::_goto_w: | |
| 923 { | |
| 924 int dest_bci = s.get_far_dest(); | |
| 925 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 926 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 927 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 928 fall_through = false; | |
| 929 break; | |
| 930 } | |
| 931 case Bytecodes::_jsr_w: | |
| 932 { | |
| 933 int dest_bci = s.get_far_dest(); | |
| 934 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 935 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 936 state.apush(empty_map); | |
| 937 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 938 fall_through = false; | |
| 939 break; | |
| 940 } | |
| 941 case Bytecodes::_breakpoint: | |
| 942 break; | |
| 943 default: | |
| 944 ShouldNotReachHere(); | |
| 945 break; | |
| 946 } | |
| 947 | |
| 948 } | |
| 949 if (fall_through) { | |
| 950 int fall_through_bci = s.cur_bci(); | |
| 951 if (fall_through_bci < _method->code_size()) { | |
| 952 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
| 953 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
| 954 } | |
| 955 } | |
| 956 } | |
| 957 | |
| 958 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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959 StateInfo *d_state = blockstates + dest->index(); |
| 0 | 960 int nlocals = _method->max_locals(); |
| 961 | |
| 962 // exceptions may cause transfer of control to handlers in the middle of a | |
| 963 // block, so we don't merge the incoming state of exception handlers | |
| 964 if (dest->is_handler()) | |
| 965 return; | |
| 966 if (!d_state->_initialized ) { | |
| 967 // destination not initialized, just copy | |
| 968 for (int i = 0; i < nlocals; i++) { | |
| 969 d_state->_vars[i] = s_state->_vars[i]; | |
| 970 } | |
| 971 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 972 d_state->_stack[i] = s_state->_stack[i]; | |
| 973 } | |
| 974 d_state->_stack_height = s_state->_stack_height; | |
| 975 d_state->_max_stack = s_state->_max_stack; | |
| 976 d_state->_initialized = true; | |
| 977 } else if (!dest->processed()) { | |
| 978 // we have not yet walked the bytecodes of dest, we can merge | |
| 979 // the states | |
| 980 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 981 for (int i = 0; i < nlocals; i++) { | |
| 982 d_state->_vars[i].set_union(s_state->_vars[i]); | |
| 983 } | |
| 984 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 985 d_state->_stack[i].set_union(s_state->_stack[i]); | |
| 986 } | |
| 987 } else { | |
| 988 // the bytecodes of dest have already been processed, mark any | |
| 989 // arguments in the source state which are not in the dest state | |
| 990 // as global escape. | |
| 991 // Future refinement: we only need to mark these variable to the | |
| 992 // maximum escape of any variables in dest state | |
| 993 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 994 ArgumentMap extra_vars; | |
| 995 for (int i = 0; i < nlocals; i++) { | |
| 996 ArgumentMap t; | |
| 997 t = s_state->_vars[i]; | |
| 998 t.set_difference(d_state->_vars[i]); | |
| 999 extra_vars.set_union(t); | |
| 1000 } | |
| 1001 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 1002 ArgumentMap t; | |
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1003 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
| 0 | 1004 t.clear(); |
| 1005 t = s_state->_stack[i]; | |
| 1006 t.set_difference(d_state->_stack[i]); | |
| 1007 extra_vars.set_union(t); | |
| 1008 } | |
| 1009 set_global_escape(extra_vars); | |
| 1010 } | |
| 1011 } | |
| 1012 | |
| 1013 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
| 1014 int numblocks = _methodBlocks->num_blocks(); | |
| 1015 int stkSize = _method->max_stack(); | |
| 1016 int numLocals = _method->max_locals(); | |
| 1017 StateInfo state; | |
| 1018 | |
| 1019 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
| 1020 int datasize = datacount * sizeof(ArgumentMap); | |
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1021 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
| 0 | 1022 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
| 1023 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
| 1024 ArgumentMap *dp = statedata; | |
| 1025 state._vars = dp; | |
| 1026 dp += numLocals; | |
| 1027 state._stack = dp; | |
| 1028 dp += stkSize; | |
| 1029 state._initialized = false; | |
| 1030 state._max_stack = stkSize; | |
| 1031 for (int i = 0; i < numblocks; i++) { | |
| 1032 blockstates[i]._vars = dp; | |
| 1033 dp += numLocals; | |
| 1034 blockstates[i]._stack = dp; | |
| 1035 dp += stkSize; | |
| 1036 blockstates[i]._initialized = false; | |
| 1037 blockstates[i]._stack_height = 0; | |
| 1038 blockstates[i]._max_stack = stkSize; | |
| 1039 } | |
| 1040 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
| 1041 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
| 1042 | |
| 1043 _methodBlocks->clear_processed(); | |
| 1044 | |
| 1045 // initialize block 0 state from method signature | |
| 1046 ArgumentMap allVars; // all oop arguments to method | |
| 1047 ciSignature* sig = method()->signature(); | |
| 1048 int j = 0; | |
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1049 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1050 int fb_i = first_blk->index(); |
| 0 | 1051 if (!method()->is_static()) { |
| 1052 // record information for "this" | |
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1053 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1054 allVars.add(j); |
| 1055 j++; | |
| 1056 } | |
| 1057 for (int i = 0; i < sig->count(); i++) { | |
| 1058 ciType* t = sig->type_at(i); | |
| 1059 if (!t->is_primitive_type()) { | |
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1060 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1061 allVars.add(j); |
| 1062 } | |
| 1063 j += t->size(); | |
| 1064 } | |
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1065 blockstates[fb_i]._initialized = true; |
| 0 | 1066 assert(j == _arg_size, "just checking"); |
| 1067 | |
| 1068 ArgumentMap unknown_map; | |
| 1069 unknown_map.add_unknown(); | |
| 1070 | |
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1071 worklist.push(first_blk); |
| 0 | 1072 while(worklist.length() > 0) { |
| 1073 ciBlock *blk = worklist.pop(); | |
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1074 StateInfo *blkState = blockstates + blk->index(); |
| 0 | 1075 if (blk->is_handler() || blk->is_ret_target()) { |
| 1076 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1077 // that any variable could contain any argument |
| 0 | 1078 for (int i = 0; i < numLocals; i++) { |
| 1079 state._vars[i] = allVars; | |
| 1080 } | |
| 1081 if (blk->is_handler()) { | |
| 1082 state._stack_height = 1; | |
| 1083 } else { | |
| 1084 state._stack_height = blkState->_stack_height; | |
| 1085 } | |
| 1086 for (int i = 0; i < state._stack_height; i++) { | |
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1087 // ??? should this be unknown_map ??? |
| 0 | 1088 state._stack[i] = allVars; |
| 1089 } | |
| 1090 } else { | |
| 1091 for (int i = 0; i < numLocals; i++) { | |
| 1092 state._vars[i] = blkState->_vars[i]; | |
| 1093 } | |
| 1094 for (int i = 0; i < blkState->_stack_height; i++) { | |
| 1095 state._stack[i] = blkState->_stack[i]; | |
| 1096 } | |
| 1097 state._stack_height = blkState->_stack_height; | |
| 1098 } | |
| 1099 iterate_one_block(blk, state, successors); | |
| 1100 // if this block has any exception handlers, push them | |
| 1101 // onto successor list | |
| 1102 if (blk->has_handler()) { | |
| 1103 DEBUG_ONLY(int handler_count = 0;) | |
| 1104 int blk_start = blk->start_bci(); | |
| 1105 int blk_end = blk->limit_bci(); | |
| 1106 for (int i = 0; i < numblocks; i++) { | |
| 1107 ciBlock *b = _methodBlocks->block(i); | |
| 1108 if (b->is_handler()) { | |
| 1109 int ex_start = b->ex_start_bci(); | |
| 1110 int ex_end = b->ex_limit_bci(); | |
| 1111 if ((ex_start >= blk_start && ex_start < blk_end) || | |
| 1112 (ex_end > blk_start && ex_end <= blk_end)) { | |
| 1113 successors.push(b); | |
| 1114 } | |
| 1115 DEBUG_ONLY(handler_count++;) | |
| 1116 } | |
| 1117 } | |
| 1118 assert(handler_count > 0, "must find at least one handler"); | |
| 1119 } | |
| 1120 // merge computed variable state with successors | |
| 1121 while(successors.length() > 0) { | |
| 1122 ciBlock *succ = successors.pop(); | |
| 1123 merge_block_states(blockstates, succ, &state); | |
| 1124 if (!succ->processed()) | |
| 1125 worklist.push(succ); | |
| 1126 } | |
| 1127 } | |
| 1128 } | |
| 1129 | |
| 1130 bool BCEscapeAnalyzer::do_analysis() { | |
| 1131 Arena* arena = CURRENT_ENV->arena(); | |
| 1132 // identify basic blocks | |
| 1133 _methodBlocks = _method->get_method_blocks(); | |
| 1134 | |
| 1135 iterate_blocks(arena); | |
| 1136 // TEMPORARY | |
| 1137 return true; | |
| 1138 } | |
| 1139 | |
| 1140 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
| 1141 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
| 1142 | |
| 1143 if (iid == vmIntrinsics::_getClass || | |
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1144 iid == vmIntrinsics::_fillInStackTrace || |
| 0 | 1145 iid == vmIntrinsics::_hashCode) |
| 1146 return iid; | |
| 1147 else | |
| 1148 return vmIntrinsics::_none; | |
| 1149 } | |
| 1150 | |
| 1151 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1152 ArgumentMap arg; |
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1153 arg.clear(); |
| 0 | 1154 switch (iid) { |
| 1155 case vmIntrinsics::_getClass: | |
| 1156 _return_local = false; | |
| 1157 break; | |
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1158 case vmIntrinsics::_fillInStackTrace: |
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1159 arg.set(0); // 'this' |
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1160 set_returned(arg); |
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1161 break; |
| 0 | 1162 case vmIntrinsics::_hashCode: |
| 1163 // initialized state is correct | |
| 1164 break; | |
| 1165 default: | |
| 1166 assert(false, "unexpected intrinsic"); | |
| 1167 } | |
| 1168 return true; | |
| 1169 } | |
| 1170 | |
| 1171 void BCEscapeAnalyzer::initialize() { | |
| 1172 int i; | |
| 1173 | |
| 1174 // clear escape information (method may have been deoptimized) | |
| 1175 methodData()->clear_escape_info(); | |
| 1176 | |
| 1177 // initialize escape state of object parameters | |
| 1178 ciSignature* sig = method()->signature(); | |
| 1179 int j = 0; | |
| 1180 if (!method()->is_static()) { | |
|
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1181 _arg_local.set(0); |
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1182 _arg_stack.set(0); |
| 0 | 1183 j++; |
| 1184 } | |
| 1185 for (i = 0; i < sig->count(); i++) { | |
| 1186 ciType* t = sig->type_at(i); | |
| 1187 if (!t->is_primitive_type()) { | |
|
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1188 _arg_local.set(j); |
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1189 _arg_stack.set(j); |
| 0 | 1190 } |
| 1191 j += t->size(); | |
| 1192 } | |
| 1193 assert(j == _arg_size, "just checking"); | |
| 1194 | |
| 1195 // start with optimistic assumption | |
| 1196 ciType *rt = _method->return_type(); | |
| 1197 if (rt->is_primitive_type()) { | |
| 1198 _return_local = false; | |
| 1199 _return_allocated = false; | |
| 1200 } else { | |
| 1201 _return_local = true; | |
| 1202 _return_allocated = true; | |
| 1203 } | |
| 1204 _allocated_escapes = false; | |
|
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1205 _unknown_modified = false; |
| 0 | 1206 } |
| 1207 | |
| 1208 void BCEscapeAnalyzer::clear_escape_info() { | |
| 1209 ciSignature* sig = method()->signature(); | |
| 1210 int arg_count = sig->count(); | |
| 1211 ArgumentMap var; | |
|
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1212 if (!method()->is_static()) { |
|
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1213 arg_count++; // allow for "this" |
|
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1214 } |
| 0 | 1215 for (int i = 0; i < arg_count; i++) { |
|
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1216 set_arg_modified(i, OFFSET_ANY, 4); |
| 0 | 1217 var.clear(); |
| 1218 var.set(i); | |
|
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1219 set_modified(var, OFFSET_ANY, 4); |
| 0 | 1220 set_global_escape(var); |
| 1221 } | |
|
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1222 _arg_local.Clear(); |
|
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1223 _arg_stack.Clear(); |
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|
1224 _arg_returned.Clear(); |
| 0 | 1225 _return_local = false; |
| 1226 _return_allocated = false; | |
| 1227 _allocated_escapes = true; | |
|
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1228 _unknown_modified = true; |
| 0 | 1229 } |
| 1230 | |
| 1231 | |
| 1232 void BCEscapeAnalyzer::compute_escape_info() { | |
| 1233 int i; | |
| 1234 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
| 1235 | |
| 1236 vmIntrinsics::ID iid = known_intrinsic(); | |
| 1237 | |
| 1238 // check if method can be analyzed | |
| 1239 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
| 1240 || _level > MaxBCEAEstimateLevel | |
| 1241 || method()->code_size() > MaxBCEAEstimateSize)) { | |
| 1242 if (BCEATraceLevel >= 1) { | |
| 1243 tty->print("Skipping method because: "); | |
| 1244 if (method()->is_abstract()) | |
| 1245 tty->print_cr("method is abstract."); | |
| 1246 else if (method()->is_native()) | |
| 1247 tty->print_cr("method is native."); | |
| 1248 else if (!method()->holder()->is_initialized()) | |
| 1249 tty->print_cr("class of method is not initialized."); | |
| 1250 else if (_level > MaxBCEAEstimateLevel) | |
| 1251 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
| 1252 _level, MaxBCEAEstimateLevel); | |
| 1253 else if (method()->code_size() > MaxBCEAEstimateSize) | |
| 1254 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
| 1255 method()->code_size(), MaxBCEAEstimateSize); | |
| 1256 else | |
| 1257 ShouldNotReachHere(); | |
| 1258 } | |
| 1259 clear_escape_info(); | |
| 1260 | |
| 1261 return; | |
| 1262 } | |
| 1263 | |
| 1264 if (BCEATraceLevel >= 1) { | |
| 1265 tty->print("[EA] estimating escape information for"); | |
| 1266 if (iid != vmIntrinsics::_none) | |
| 1267 tty->print(" intrinsic"); | |
| 1268 method()->print_short_name(); | |
| 1269 tty->print_cr(" (%d bytes)", method()->code_size()); | |
| 1270 } | |
| 1271 | |
| 1272 bool success; | |
| 1273 | |
| 1274 initialize(); | |
| 1275 | |
|
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1276 // Do not scan method if it has no object parameters and |
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1277 // does not returns an object (_return_allocated is set in initialize()). |
|
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1278 if (_arg_local.Size() == 0 && !_return_allocated) { |
|
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1279 // Clear all info since method's bytecode was not analysed and |
|
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1280 // set pessimistic escape information. |
|
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1281 clear_escape_info(); |
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1282 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1283 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
| 0 | 1284 methodData()->set_eflag(methodDataOopDesc::estimated); |
| 1285 return; | |
| 1286 } | |
| 1287 | |
| 1288 if (iid != vmIntrinsics::_none) | |
| 1289 success = compute_escape_for_intrinsic(iid); | |
| 1290 else { | |
| 1291 success = do_analysis(); | |
| 1292 } | |
| 1293 | |
|
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1294 // don't store interprocedural escape information if it introduces |
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1295 // dependencies or if method data is empty |
| 0 | 1296 // |
| 1297 if (!has_dependencies() && !methodData()->is_empty()) { | |
| 1298 for (i = 0; i < _arg_size; i++) { | |
|
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1299 if (_arg_local.test(i)) { |
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1300 assert(_arg_stack.test(i), "inconsistent escape info"); |
| 0 | 1301 methodData()->set_arg_local(i); |
| 1302 methodData()->set_arg_stack(i); | |
|
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1303 } else if (_arg_stack.test(i)) { |
| 0 | 1304 methodData()->set_arg_stack(i); |
| 1305 } | |
|
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1306 if (_arg_returned.test(i)) { |
| 0 | 1307 methodData()->set_arg_returned(i); |
| 1308 } | |
|
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1309 methodData()->set_arg_modified(i, _arg_modified[i]); |
| 0 | 1310 } |
| 1311 if (_return_local) { | |
| 1312 methodData()->set_eflag(methodDataOopDesc::return_local); | |
| 1313 } | |
|
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1314 if (_return_allocated) { |
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1315 methodData()->set_eflag(methodDataOopDesc::return_allocated); |
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1316 } |
|
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1317 if (_allocated_escapes) { |
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1318 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1319 } |
|
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1320 if (_unknown_modified) { |
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1321 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
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1322 } |
| 0 | 1323 methodData()->set_eflag(methodDataOopDesc::estimated); |
| 1324 } | |
| 1325 } | |
| 1326 | |
| 1327 void BCEscapeAnalyzer::read_escape_info() { | |
| 1328 assert(methodData()->has_escape_info(), "no escape info available"); | |
| 1329 | |
| 1330 // read escape information from method descriptor | |
| 1331 for (int i = 0; i < _arg_size; i++) { | |
|
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1332 if (methodData()->is_arg_local(i)) |
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1333 _arg_local.set(i); |
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1334 if (methodData()->is_arg_stack(i)) |
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1335 _arg_stack.set(i); |
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1336 if (methodData()->is_arg_returned(i)) |
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1337 _arg_returned.set(i); |
|
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1338 _arg_modified[i] = methodData()->arg_modified(i); |
| 0 | 1339 } |
| 1340 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
|
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1341 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated); |
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1342 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes); |
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1343 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified); |
| 0 | 1344 |
| 1345 } | |
| 1346 | |
|
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1347 #ifndef PRODUCT |
|
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1348 void BCEscapeAnalyzer::dump() { |
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1349 tty->print("[EA] estimated escape information for"); |
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1350 method()->print_short_name(); |
|
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1351 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
|
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1352 tty->print(" non-escaping args: "); |
|
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1353 _arg_local.print_on(tty); |
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1354 tty->print(" stack-allocatable args: "); |
|
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1355 _arg_stack.print_on(tty); |
|
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1356 if (_return_local) { |
|
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1357 tty->print(" returned args: "); |
|
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1358 _arg_returned.print_on(tty); |
|
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1359 } else if (is_return_allocated()) { |
|
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1360 tty->print_cr(" return allocated value"); |
|
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1361 } else { |
|
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1362 tty->print_cr(" return non-local value"); |
|
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1363 } |
|
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1364 tty->print(" modified args: "); |
|
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1365 for (int i = 0; i < _arg_size; i++) { |
|
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1366 if (_arg_modified[i] == 0) |
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1367 tty->print(" 0"); |
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1368 else |
|
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|
1369 tty->print(" 0x%x", _arg_modified[i]); |
|
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1370 } |
|
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1371 tty->cr(); |
|
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1372 tty->print(" flags: "); |
|
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|
1373 if (_return_allocated) |
|
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1374 tty->print(" return_allocated"); |
|
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|
1375 if (_allocated_escapes) |
|
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|
1376 tty->print(" allocated_escapes"); |
|
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|
1377 if (_unknown_modified) |
|
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|
1378 tty->print(" unknown_modified"); |
|
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|
1379 tty->cr(); |
|
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|
1380 } |
|
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|
1381 #endif |
| 0 | 1382 |
| 1383 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
| 1384 : _conservative(method == NULL || !EstimateArgEscape) | |
|
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1385 , _arena(CURRENT_ENV->arena()) |
| 0 | 1386 , _method(method) |
| 1387 , _methodData(method ? method->method_data() : NULL) | |
| 1388 , _arg_size(method ? method->arg_size() : 0) | |
|
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1389 , _arg_local(_arena) |
|
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1390 , _arg_stack(_arena) |
|
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1391 , _arg_returned(_arena) |
|
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1392 , _dirty(_arena) |
| 0 | 1393 , _return_local(false) |
| 1394 , _return_allocated(false) | |
| 1395 , _allocated_escapes(false) | |
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1396 , _unknown_modified(false) |
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1397 , _dependencies(_arena, 4, 0, NULL) |
| 0 | 1398 , _parent(parent) |
| 1399 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
| 1400 if (!_conservative) { | |
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1401 _arg_local.Clear(); |
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1402 _arg_stack.Clear(); |
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1403 _arg_returned.Clear(); |
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1404 _dirty.Clear(); |
| 0 | 1405 Arena* arena = CURRENT_ENV->arena(); |
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1406 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1407 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
| 0 | 1408 |
| 1409 if (methodData() == NULL) | |
| 1410 return; | |
| 1411 bool printit = _method->should_print_assembly(); | |
| 1412 if (methodData()->has_escape_info()) { | |
| 1413 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
| 1414 method->holder()->name()->as_utf8(), | |
| 1415 method->name()->as_utf8())); | |
| 1416 read_escape_info(); | |
| 1417 } else { | |
| 1418 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
| 1419 method->holder()->name()->as_utf8(), | |
| 1420 method->name()->as_utf8())); | |
| 1421 | |
| 1422 compute_escape_info(); | |
| 1423 methodData()->update_escape_info(); | |
| 1424 } | |
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1425 #ifndef PRODUCT |
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1426 if (BCEATraceLevel >= 3) { |
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1427 // dump escape information |
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1428 dump(); |
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1429 } |
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1430 #endif |
| 0 | 1431 } |
| 1432 } | |
| 1433 | |
| 1434 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
|
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1435 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
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1436 // Also record evol dependencies so redefinition of the |
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1437 // callee will trigger recompilation. |
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1438 deps->assert_evol_method(method()); |
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1439 } |
| 0 | 1440 for (int i = 0; i < _dependencies.length(); i+=2) { |
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1441 ciKlass *k = _dependencies.at(i)->as_klass(); |
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1442 ciMethod *m = _dependencies.at(i+1)->as_method(); |
| 0 | 1443 deps->assert_unique_concrete_method(k, m); |
| 1444 } | |
| 1445 } |