Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children | 52b4284cb496 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2005, 2013, 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 // return true if all argument elements of vars are returned |
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142 bool BCEscapeAnalyzer::returns_all(ArgumentMap vars) { |
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143 for (int i = 0; i < _arg_size; i++) { |
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144 if (vars.contains(i) && !_arg_returned.test(i)) { |
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145 return false; |
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146 } |
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147 } |
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148 return true; |
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149 } |
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150 |
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151 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { |
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152 for (int i = 0; i < _arg_size; i++) { |
| 0 | 153 if (vars.contains(i)) { |
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154 bm >>= i; |
| 0 | 155 } |
| 156 } | |
| 157 } | |
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158 |
| 0 | 159 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { |
| 160 clear_bits(vars, _arg_local); | |
| 161 } | |
| 162 | |
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163 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) { |
| 0 | 164 clear_bits(vars, _arg_local); |
| 165 clear_bits(vars, _arg_stack); | |
| 166 if (vars.contains_allocated()) | |
| 167 _allocated_escapes = true; | |
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168 |
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169 if (merge && !vars.is_empty()) { |
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170 // Merge new state into already processed block. |
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171 // New state is not taken into account and |
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172 // it may invalidate set_returned() result. |
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173 if (vars.contains_unknown() || vars.contains_allocated()) { |
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174 _return_local = false; |
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175 } |
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176 if (vars.contains_unknown() || vars.contains_vars()) { |
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177 _return_allocated = false; |
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178 } |
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179 if (_return_local && vars.contains_vars() && !returns_all(vars)) { |
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180 // Return result should be invalidated if args in new |
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181 // state are not recorded in return state. |
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182 _return_local = false; |
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183 } |
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184 } |
| 0 | 185 } |
| 186 | |
| 187 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
| 188 clear_bits(vars, _dirty); | |
| 189 } | |
| 190 | |
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191 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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192 |
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193 for (int i = 0; i < _arg_size; i++) { |
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194 if (vars.contains(i)) { |
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195 set_arg_modified(i, offs, size); |
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196 } |
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197 } |
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198 if (vars.contains_unknown()) |
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199 _unknown_modified = true; |
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200 } |
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201 |
| 0 | 202 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
| 203 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
| 204 if (scope->method() == callee) { | |
| 205 return true; | |
| 206 } | |
| 207 } | |
| 208 return false; | |
| 209 } | |
| 210 | |
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211 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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212 if (offset == OFFSET_ANY) |
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213 return _arg_modified[arg] != 0; |
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214 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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215 bool modified = false; |
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216 int l = offset / HeapWordSize; |
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217 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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218 if (l > ARG_OFFSET_MAX) |
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219 l = ARG_OFFSET_MAX; |
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220 if (h > ARG_OFFSET_MAX+1) |
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221 h = ARG_OFFSET_MAX + 1; |
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222 for (int i = l; i < h; i++) { |
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223 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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224 } |
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225 return modified; |
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226 } |
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227 |
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228 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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229 if (offset == OFFSET_ANY) { |
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230 _arg_modified[arg] = (uint) -1; |
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231 return; |
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232 } |
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233 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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234 int l = offset / HeapWordSize; |
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235 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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236 if (l > ARG_OFFSET_MAX) |
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237 l = ARG_OFFSET_MAX; |
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238 if (h > ARG_OFFSET_MAX+1) |
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239 h = ARG_OFFSET_MAX + 1; |
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240 for (int i = l; i < h; i++) { |
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241 _arg_modified[arg] |= (1 << i); |
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242 } |
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243 } |
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244 |
| 0 | 245 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
| 246 int i; | |
| 247 | |
| 248 // retrieve information about the callee | |
| 249 ciInstanceKlass* klass = target->holder(); | |
| 250 ciInstanceKlass* calling_klass = method()->holder(); | |
| 251 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
| 252 ciInstanceKlass* actual_recv = callee_holder; | |
| 253 | |
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254 // Some methods are obviously bindable without any type checks so |
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255 // convert them directly to an invokespecial or invokestatic. |
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256 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { |
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257 switch (code) { |
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258 case Bytecodes::_invokevirtual: |
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259 code = Bytecodes::_invokespecial; |
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260 break; |
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261 case Bytecodes::_invokehandle: |
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262 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; |
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263 break; |
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264 } |
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265 } |
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266 |
| 0 | 267 // compute size of arguments |
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268 int arg_size = target->invoke_arg_size(code); |
| 0 | 269 int arg_base = MAX2(state._stack_height - arg_size, 0); |
| 270 | |
| 271 // direct recursive calls are skipped if they can be bound statically without introducing | |
| 272 // dependencies and if parameters are passed at the same position as in the current method | |
| 273 // other calls are skipped if there are no unescaped arguments passed to them | |
| 274 bool directly_recursive = (method() == target) && | |
| 275 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
| 276 | |
| 277 // check if analysis of callee can safely be skipped | |
| 278 bool skip_callee = true; | |
| 279 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
| 280 ArgumentMap arg = state._stack[i]; | |
| 281 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
| 282 } | |
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283 // For now we conservatively skip invokedynamic. |
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284 if (code == Bytecodes::_invokedynamic) { |
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285 skip_callee = true; |
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286 } |
| 0 | 287 if (skip_callee) { |
| 288 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
| 289 for (i = 0; i < arg_size; i++) { | |
| 290 set_method_escape(state.raw_pop()); | |
| 291 } | |
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292 _unknown_modified = true; // assume the worst since we don't analyze the called method |
| 0 | 293 return; |
| 294 } | |
| 295 | |
| 296 // determine actual method (use CHA if necessary) | |
| 297 ciMethod* inline_target = NULL; | |
| 298 if (target->is_loaded() && klass->is_loaded() | |
| 299 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
| 6973 | 300 && target->is_loaded()) { |
| 0 | 301 if (code == Bytecodes::_invokestatic |
| 302 || code == Bytecodes::_invokespecial | |
| 303 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
| 304 inline_target = target; | |
| 305 } else { | |
| 306 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
| 307 } | |
| 308 } | |
| 309 | |
| 310 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
| 311 // analyze callee | |
| 312 BCEscapeAnalyzer analyzer(inline_target, this); | |
| 313 | |
| 314 // adjust escape state of actual parameters | |
| 315 bool must_record_dependencies = false; | |
| 316 for (i = arg_size - 1; i >= 0; i--) { | |
| 317 ArgumentMap arg = state.raw_pop(); | |
| 318 if (!is_argument(arg)) | |
| 319 continue; | |
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320 for (int j = 0; j < _arg_size; j++) { |
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321 if (arg.contains(j)) { |
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322 _arg_modified[j] |= analyzer._arg_modified[i]; |
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323 } |
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324 } |
| 0 | 325 if (!is_arg_stack(arg)) { |
| 326 // arguments have already been recognized as escaping | |
| 327 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
| 328 set_method_escape(arg); | |
| 329 must_record_dependencies = true; | |
| 330 } else { | |
| 331 set_global_escape(arg); | |
| 332 } | |
| 333 } | |
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334 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
| 0 | 335 |
| 336 // record dependencies if at least one parameter retained stack-allocatable | |
| 337 if (must_record_dependencies) { | |
| 338 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
| 339 _dependencies.append(actual_recv); | |
| 340 _dependencies.append(inline_target); | |
| 341 } | |
| 342 _dependencies.appendAll(analyzer.dependencies()); | |
| 343 } | |
| 344 } else { | |
| 345 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
| 346 target->name()->as_utf8())); | |
| 347 // conservatively mark all actual parameters as escaping globally | |
| 348 for (i = 0; i < arg_size; i++) { | |
| 349 ArgumentMap arg = state.raw_pop(); | |
| 350 if (!is_argument(arg)) | |
| 351 continue; | |
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352 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 353 set_global_escape(arg); |
| 354 } | |
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355 _unknown_modified = true; // assume the worst since we don't know the called method |
| 0 | 356 } |
| 357 } | |
| 358 | |
| 359 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
| 360 return ((~arg_set1) | arg_set2) == 0; | |
| 361 } | |
| 362 | |
| 363 | |
| 364 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
| 365 | |
| 366 blk->set_processed(); | |
| 367 ciBytecodeStream s(method()); | |
| 368 int limit_bci = blk->limit_bci(); | |
| 369 bool fall_through = false; | |
| 370 ArgumentMap allocated_obj; | |
| 371 allocated_obj.add_allocated(); | |
| 372 ArgumentMap unknown_obj; | |
| 373 unknown_obj.add_unknown(); | |
| 374 ArgumentMap empty_map; | |
| 375 | |
| 376 s.reset_to_bci(blk->start_bci()); | |
| 377 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
| 378 fall_through = true; | |
| 379 switch (s.cur_bc()) { | |
| 380 case Bytecodes::_nop: | |
| 381 break; | |
| 382 case Bytecodes::_aconst_null: | |
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383 state.apush(unknown_obj); |
| 0 | 384 break; |
| 385 case Bytecodes::_iconst_m1: | |
| 386 case Bytecodes::_iconst_0: | |
| 387 case Bytecodes::_iconst_1: | |
| 388 case Bytecodes::_iconst_2: | |
| 389 case Bytecodes::_iconst_3: | |
| 390 case Bytecodes::_iconst_4: | |
| 391 case Bytecodes::_iconst_5: | |
| 392 case Bytecodes::_fconst_0: | |
| 393 case Bytecodes::_fconst_1: | |
| 394 case Bytecodes::_fconst_2: | |
| 395 case Bytecodes::_bipush: | |
| 396 case Bytecodes::_sipush: | |
| 397 state.spush(); | |
| 398 break; | |
| 399 case Bytecodes::_lconst_0: | |
| 400 case Bytecodes::_lconst_1: | |
| 401 case Bytecodes::_dconst_0: | |
| 402 case Bytecodes::_dconst_1: | |
| 403 state.lpush(); | |
| 404 break; | |
| 405 case Bytecodes::_ldc: | |
| 406 case Bytecodes::_ldc_w: | |
| 407 case Bytecodes::_ldc2_w: | |
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408 { |
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409 // Avoid calling get_constant() which will try to allocate |
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410 // unloaded constant. We need only constant's type. |
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411 int index = s.get_constant_pool_index(); |
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412 constantTag tag = s.get_constant_pool_tag(index); |
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413 if (tag.is_long() || tag.is_double()) { |
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414 // Only longs and doubles use 2 stack slots. |
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415 state.lpush(); |
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416 } else if (tag.basic_type() == T_OBJECT) { |
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417 state.apush(unknown_obj); |
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418 } else { |
| 0 | 419 state.spush(); |
| 420 } | |
| 421 break; | |
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422 } |
| 0 | 423 case Bytecodes::_aload: |
| 424 state.apush(state._vars[s.get_index()]); | |
| 425 break; | |
| 426 case Bytecodes::_iload: | |
| 427 case Bytecodes::_fload: | |
| 428 case Bytecodes::_iload_0: | |
| 429 case Bytecodes::_iload_1: | |
| 430 case Bytecodes::_iload_2: | |
| 431 case Bytecodes::_iload_3: | |
| 432 case Bytecodes::_fload_0: | |
| 433 case Bytecodes::_fload_1: | |
| 434 case Bytecodes::_fload_2: | |
| 435 case Bytecodes::_fload_3: | |
| 436 state.spush(); | |
| 437 break; | |
| 438 case Bytecodes::_lload: | |
| 439 case Bytecodes::_dload: | |
| 440 case Bytecodes::_lload_0: | |
| 441 case Bytecodes::_lload_1: | |
| 442 case Bytecodes::_lload_2: | |
| 443 case Bytecodes::_lload_3: | |
| 444 case Bytecodes::_dload_0: | |
| 445 case Bytecodes::_dload_1: | |
| 446 case Bytecodes::_dload_2: | |
| 447 case Bytecodes::_dload_3: | |
| 448 state.lpush(); | |
| 449 break; | |
| 450 case Bytecodes::_aload_0: | |
| 451 state.apush(state._vars[0]); | |
| 452 break; | |
| 453 case Bytecodes::_aload_1: | |
| 454 state.apush(state._vars[1]); | |
| 455 break; | |
| 456 case Bytecodes::_aload_2: | |
| 457 state.apush(state._vars[2]); | |
| 458 break; | |
| 459 case Bytecodes::_aload_3: | |
| 460 state.apush(state._vars[3]); | |
| 461 break; | |
| 462 case Bytecodes::_iaload: | |
| 463 case Bytecodes::_faload: | |
| 464 case Bytecodes::_baload: | |
| 465 case Bytecodes::_caload: | |
| 466 case Bytecodes::_saload: | |
| 467 state.spop(); | |
| 468 set_method_escape(state.apop()); | |
| 469 state.spush(); | |
| 470 break; | |
| 471 case Bytecodes::_laload: | |
| 472 case Bytecodes::_daload: | |
| 473 state.spop(); | |
| 474 set_method_escape(state.apop()); | |
| 475 state.lpush(); | |
| 476 break; | |
| 477 case Bytecodes::_aaload: | |
| 478 { state.spop(); | |
| 479 ArgumentMap array = state.apop(); | |
| 480 set_method_escape(array); | |
| 481 state.apush(unknown_obj); | |
| 482 set_dirty(array); | |
| 483 } | |
| 484 break; | |
| 485 case Bytecodes::_istore: | |
| 486 case Bytecodes::_fstore: | |
| 487 case Bytecodes::_istore_0: | |
| 488 case Bytecodes::_istore_1: | |
| 489 case Bytecodes::_istore_2: | |
| 490 case Bytecodes::_istore_3: | |
| 491 case Bytecodes::_fstore_0: | |
| 492 case Bytecodes::_fstore_1: | |
| 493 case Bytecodes::_fstore_2: | |
| 494 case Bytecodes::_fstore_3: | |
| 495 state.spop(); | |
| 496 break; | |
| 497 case Bytecodes::_lstore: | |
| 498 case Bytecodes::_dstore: | |
| 499 case Bytecodes::_lstore_0: | |
| 500 case Bytecodes::_lstore_1: | |
| 501 case Bytecodes::_lstore_2: | |
| 502 case Bytecodes::_lstore_3: | |
| 503 case Bytecodes::_dstore_0: | |
| 504 case Bytecodes::_dstore_1: | |
| 505 case Bytecodes::_dstore_2: | |
| 506 case Bytecodes::_dstore_3: | |
| 507 state.lpop(); | |
| 508 break; | |
| 509 case Bytecodes::_astore: | |
| 510 state._vars[s.get_index()] = state.apop(); | |
| 511 break; | |
| 512 case Bytecodes::_astore_0: | |
| 513 state._vars[0] = state.apop(); | |
| 514 break; | |
| 515 case Bytecodes::_astore_1: | |
| 516 state._vars[1] = state.apop(); | |
| 517 break; | |
| 518 case Bytecodes::_astore_2: | |
| 519 state._vars[2] = state.apop(); | |
| 520 break; | |
| 521 case Bytecodes::_astore_3: | |
| 522 state._vars[3] = state.apop(); | |
| 523 break; | |
| 524 case Bytecodes::_iastore: | |
| 525 case Bytecodes::_fastore: | |
| 526 case Bytecodes::_bastore: | |
| 527 case Bytecodes::_castore: | |
| 528 case Bytecodes::_sastore: | |
| 529 { | |
| 530 state.spop(); | |
| 531 state.spop(); | |
| 532 ArgumentMap arr = state.apop(); | |
| 533 set_method_escape(arr); | |
|
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534 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 535 break; |
| 536 } | |
| 537 case Bytecodes::_lastore: | |
| 538 case Bytecodes::_dastore: | |
| 539 { | |
| 540 state.lpop(); | |
| 541 state.spop(); | |
| 542 ArgumentMap arr = state.apop(); | |
| 543 set_method_escape(arr); | |
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544 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
| 0 | 545 break; |
| 546 } | |
| 547 case Bytecodes::_aastore: | |
| 548 { | |
| 549 set_global_escape(state.apop()); | |
| 550 state.spop(); | |
| 551 ArgumentMap arr = state.apop(); | |
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552 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
| 0 | 553 break; |
| 554 } | |
| 555 case Bytecodes::_pop: | |
| 556 state.raw_pop(); | |
| 557 break; | |
| 558 case Bytecodes::_pop2: | |
| 559 state.raw_pop(); | |
| 560 state.raw_pop(); | |
| 561 break; | |
| 562 case Bytecodes::_dup: | |
| 563 { ArgumentMap w1 = state.raw_pop(); | |
| 564 state.raw_push(w1); | |
| 565 state.raw_push(w1); | |
| 566 } | |
| 567 break; | |
| 568 case Bytecodes::_dup_x1: | |
| 569 { ArgumentMap w1 = state.raw_pop(); | |
| 570 ArgumentMap w2 = state.raw_pop(); | |
| 571 state.raw_push(w1); | |
| 572 state.raw_push(w2); | |
| 573 state.raw_push(w1); | |
| 574 } | |
| 575 break; | |
| 576 case Bytecodes::_dup_x2: | |
| 577 { ArgumentMap w1 = state.raw_pop(); | |
| 578 ArgumentMap w2 = state.raw_pop(); | |
| 579 ArgumentMap w3 = state.raw_pop(); | |
| 580 state.raw_push(w1); | |
| 581 state.raw_push(w3); | |
| 582 state.raw_push(w2); | |
| 583 state.raw_push(w1); | |
| 584 } | |
| 585 break; | |
| 586 case Bytecodes::_dup2: | |
| 587 { ArgumentMap w1 = state.raw_pop(); | |
| 588 ArgumentMap w2 = state.raw_pop(); | |
| 589 state.raw_push(w2); | |
| 590 state.raw_push(w1); | |
| 591 state.raw_push(w2); | |
| 592 state.raw_push(w1); | |
| 593 } | |
| 594 break; | |
| 595 case Bytecodes::_dup2_x1: | |
| 596 { ArgumentMap w1 = state.raw_pop(); | |
| 597 ArgumentMap w2 = state.raw_pop(); | |
| 598 ArgumentMap w3 = state.raw_pop(); | |
| 599 state.raw_push(w2); | |
| 600 state.raw_push(w1); | |
| 601 state.raw_push(w3); | |
| 602 state.raw_push(w2); | |
| 603 state.raw_push(w1); | |
| 604 } | |
| 605 break; | |
| 606 case Bytecodes::_dup2_x2: | |
| 607 { ArgumentMap w1 = state.raw_pop(); | |
| 608 ArgumentMap w2 = state.raw_pop(); | |
| 609 ArgumentMap w3 = state.raw_pop(); | |
| 610 ArgumentMap w4 = state.raw_pop(); | |
| 611 state.raw_push(w2); | |
| 612 state.raw_push(w1); | |
| 613 state.raw_push(w4); | |
| 614 state.raw_push(w3); | |
| 615 state.raw_push(w2); | |
| 616 state.raw_push(w1); | |
| 617 } | |
| 618 break; | |
| 619 case Bytecodes::_swap: | |
| 620 { ArgumentMap w1 = state.raw_pop(); | |
| 621 ArgumentMap w2 = state.raw_pop(); | |
| 622 state.raw_push(w1); | |
| 623 state.raw_push(w2); | |
| 624 } | |
| 625 break; | |
| 626 case Bytecodes::_iadd: | |
| 627 case Bytecodes::_fadd: | |
| 628 case Bytecodes::_isub: | |
| 629 case Bytecodes::_fsub: | |
| 630 case Bytecodes::_imul: | |
| 631 case Bytecodes::_fmul: | |
| 632 case Bytecodes::_idiv: | |
| 633 case Bytecodes::_fdiv: | |
| 634 case Bytecodes::_irem: | |
| 635 case Bytecodes::_frem: | |
| 636 case Bytecodes::_iand: | |
| 637 case Bytecodes::_ior: | |
| 638 case Bytecodes::_ixor: | |
| 639 state.spop(); | |
| 640 state.spop(); | |
| 641 state.spush(); | |
| 642 break; | |
| 643 case Bytecodes::_ladd: | |
| 644 case Bytecodes::_dadd: | |
| 645 case Bytecodes::_lsub: | |
| 646 case Bytecodes::_dsub: | |
| 647 case Bytecodes::_lmul: | |
| 648 case Bytecodes::_dmul: | |
| 649 case Bytecodes::_ldiv: | |
| 650 case Bytecodes::_ddiv: | |
| 651 case Bytecodes::_lrem: | |
| 652 case Bytecodes::_drem: | |
| 653 case Bytecodes::_land: | |
| 654 case Bytecodes::_lor: | |
| 655 case Bytecodes::_lxor: | |
| 656 state.lpop(); | |
| 657 state.lpop(); | |
| 658 state.lpush(); | |
| 659 break; | |
| 660 case Bytecodes::_ishl: | |
| 661 case Bytecodes::_ishr: | |
| 662 case Bytecodes::_iushr: | |
| 663 state.spop(); | |
| 664 state.spop(); | |
| 665 state.spush(); | |
| 666 break; | |
| 667 case Bytecodes::_lshl: | |
| 668 case Bytecodes::_lshr: | |
| 669 case Bytecodes::_lushr: | |
| 670 state.spop(); | |
| 671 state.lpop(); | |
| 672 state.lpush(); | |
| 673 break; | |
| 674 case Bytecodes::_ineg: | |
| 675 case Bytecodes::_fneg: | |
| 676 state.spop(); | |
| 677 state.spush(); | |
| 678 break; | |
| 679 case Bytecodes::_lneg: | |
| 680 case Bytecodes::_dneg: | |
| 681 state.lpop(); | |
| 682 state.lpush(); | |
| 683 break; | |
| 684 case Bytecodes::_iinc: | |
| 685 break; | |
| 686 case Bytecodes::_i2l: | |
| 687 case Bytecodes::_i2d: | |
| 688 case Bytecodes::_f2l: | |
| 689 case Bytecodes::_f2d: | |
| 690 state.spop(); | |
| 691 state.lpush(); | |
| 692 break; | |
| 693 case Bytecodes::_i2f: | |
| 694 case Bytecodes::_f2i: | |
| 695 state.spop(); | |
| 696 state.spush(); | |
| 697 break; | |
| 698 case Bytecodes::_l2i: | |
| 699 case Bytecodes::_l2f: | |
| 700 case Bytecodes::_d2i: | |
| 701 case Bytecodes::_d2f: | |
| 702 state.lpop(); | |
| 703 state.spush(); | |
| 704 break; | |
| 705 case Bytecodes::_l2d: | |
| 706 case Bytecodes::_d2l: | |
| 707 state.lpop(); | |
| 708 state.lpush(); | |
| 709 break; | |
| 710 case Bytecodes::_i2b: | |
| 711 case Bytecodes::_i2c: | |
| 712 case Bytecodes::_i2s: | |
| 713 state.spop(); | |
| 714 state.spush(); | |
| 715 break; | |
| 716 case Bytecodes::_lcmp: | |
| 717 case Bytecodes::_dcmpl: | |
| 718 case Bytecodes::_dcmpg: | |
| 719 state.lpop(); | |
| 720 state.lpop(); | |
| 721 state.spush(); | |
| 722 break; | |
| 723 case Bytecodes::_fcmpl: | |
| 724 case Bytecodes::_fcmpg: | |
| 725 state.spop(); | |
| 726 state.spop(); | |
| 727 state.spush(); | |
| 728 break; | |
| 729 case Bytecodes::_ifeq: | |
| 730 case Bytecodes::_ifne: | |
| 731 case Bytecodes::_iflt: | |
| 732 case Bytecodes::_ifge: | |
| 733 case Bytecodes::_ifgt: | |
| 734 case Bytecodes::_ifle: | |
| 735 { | |
| 736 state.spop(); | |
| 737 int dest_bci = s.get_dest(); | |
| 738 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 739 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 740 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 741 break; | |
| 742 } | |
| 743 case Bytecodes::_if_icmpeq: | |
| 744 case Bytecodes::_if_icmpne: | |
| 745 case Bytecodes::_if_icmplt: | |
| 746 case Bytecodes::_if_icmpge: | |
| 747 case Bytecodes::_if_icmpgt: | |
| 748 case Bytecodes::_if_icmple: | |
| 749 { | |
| 750 state.spop(); | |
| 751 state.spop(); | |
| 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 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 756 break; | |
| 757 } | |
| 758 case Bytecodes::_if_acmpeq: | |
| 759 case Bytecodes::_if_acmpne: | |
| 760 { | |
| 761 set_method_escape(state.apop()); | |
| 762 set_method_escape(state.apop()); | |
| 763 int dest_bci = s.get_dest(); | |
| 764 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 765 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 766 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 767 break; | |
| 768 } | |
| 769 case Bytecodes::_goto: | |
| 770 { | |
| 771 int dest_bci = s.get_dest(); | |
| 772 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 773 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 774 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 775 fall_through = false; | |
| 776 break; | |
| 777 } | |
| 778 case Bytecodes::_jsr: | |
| 779 { | |
| 780 int dest_bci = s.get_dest(); | |
| 781 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 782 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 783 state.apush(empty_map); | |
| 784 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 785 fall_through = false; | |
| 786 break; | |
| 787 } | |
| 788 case Bytecodes::_ret: | |
| 789 // we don't track the destination of a "ret" instruction | |
| 790 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 791 fall_through = false; | |
| 792 break; | |
| 793 case Bytecodes::_return: | |
| 794 assert(s.next_bci() == limit_bci, "return must end block"); | |
| 795 fall_through = false; | |
| 796 break; | |
| 797 case Bytecodes::_tableswitch: | |
| 798 { | |
| 799 state.spop(); | |
| 2142 | 800 Bytecode_tableswitch sw(&s); |
| 801 int len = sw.length(); | |
| 0 | 802 int dest_bci; |
| 803 for (int i = 0; i < len; i++) { | |
| 2142 | 804 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
| 0 | 805 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 806 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 807 } | |
| 2142 | 808 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 809 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 810 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 811 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 812 fall_through = false; | |
| 813 break; | |
| 814 } | |
| 815 case Bytecodes::_lookupswitch: | |
| 816 { | |
| 817 state.spop(); | |
| 2142 | 818 Bytecode_lookupswitch sw(&s); |
| 819 int len = sw.number_of_pairs(); | |
| 0 | 820 int dest_bci; |
| 821 for (int i = 0; i < len; i++) { | |
| 2142 | 822 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
| 0 | 823 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 824 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 825 } | |
| 2142 | 826 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 827 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 828 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 829 fall_through = false; | |
| 830 break; | |
| 831 } | |
| 832 case Bytecodes::_ireturn: | |
| 833 case Bytecodes::_freturn: | |
| 834 state.spop(); | |
| 835 fall_through = false; | |
| 836 break; | |
| 837 case Bytecodes::_lreturn: | |
| 838 case Bytecodes::_dreturn: | |
| 839 state.lpop(); | |
| 840 fall_through = false; | |
| 841 break; | |
| 842 case Bytecodes::_areturn: | |
| 843 set_returned(state.apop()); | |
| 844 fall_through = false; | |
| 845 break; | |
| 846 case Bytecodes::_getstatic: | |
| 847 case Bytecodes::_getfield: | |
|
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848 { bool ignored_will_link; |
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849 ciField* field = s.get_field(ignored_will_link); |
| 0 | 850 BasicType field_type = field->type()->basic_type(); |
| 851 if (s.cur_bc() != Bytecodes::_getstatic) { | |
| 852 set_method_escape(state.apop()); | |
| 853 } | |
| 854 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 855 state.apush(unknown_obj); | |
| 856 } else if (type2size[field_type] == 1) { | |
| 857 state.spush(); | |
| 858 } else { | |
| 859 state.lpush(); | |
| 860 } | |
| 861 } | |
| 862 break; | |
| 863 case Bytecodes::_putstatic: | |
| 864 case Bytecodes::_putfield: | |
| 865 { bool will_link; | |
| 866 ciField* field = s.get_field(will_link); | |
| 867 BasicType field_type = field->type()->basic_type(); | |
| 868 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 869 set_global_escape(state.apop()); | |
| 870 } else if (type2size[field_type] == 1) { | |
| 871 state.spop(); | |
| 872 } else { | |
| 873 state.lpop(); | |
| 874 } | |
| 875 if (s.cur_bc() != Bytecodes::_putstatic) { | |
| 876 ArgumentMap p = state.apop(); | |
| 877 set_method_escape(p); | |
|
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878 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
| 0 | 879 } |
| 880 } | |
| 881 break; | |
| 882 case Bytecodes::_invokevirtual: | |
| 883 case Bytecodes::_invokespecial: | |
| 884 case Bytecodes::_invokestatic: | |
|
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885 case Bytecodes::_invokedynamic: |
| 0 | 886 case Bytecodes::_invokeinterface: |
|
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887 { bool ignored_will_link; |
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888 ciSignature* declared_signature = NULL; |
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889 ciMethod* target = s.get_method(ignored_will_link, &declared_signature); |
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890 ciKlass* holder = s.get_declared_method_holder(); |
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891 assert(declared_signature != NULL, "cannot be null"); |
|
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892 // Push appendix argument, if one. |
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893 if (s.has_appendix()) { |
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894 state.apush(unknown_obj); |
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895 } |
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896 // Pass in raw bytecode because we need to see invokehandle instructions. |
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897 invoke(state, s.cur_bc_raw(), target, holder); |
|
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898 // We are using the return type of the declared signature here because |
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899 // it might be a more concrete type than the one from the target (for |
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900 // e.g. invokedynamic and invokehandle). |
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901 ciType* return_type = declared_signature->return_type(); |
| 0 | 902 if (!return_type->is_primitive_type()) { |
| 903 state.apush(unknown_obj); | |
| 904 } else if (return_type->is_one_word()) { | |
| 905 state.spush(); | |
| 906 } else if (return_type->is_two_word()) { | |
| 907 state.lpush(); | |
| 908 } | |
| 909 } | |
| 910 break; | |
| 911 case Bytecodes::_new: | |
| 912 state.apush(allocated_obj); | |
| 913 break; | |
| 914 case Bytecodes::_newarray: | |
| 915 case Bytecodes::_anewarray: | |
| 916 state.spop(); | |
| 917 state.apush(allocated_obj); | |
| 918 break; | |
| 919 case Bytecodes::_multianewarray: | |
| 920 { int i = s.cur_bcp()[3]; | |
| 921 while (i-- > 0) state.spop(); | |
| 922 state.apush(allocated_obj); | |
| 923 } | |
| 924 break; | |
| 925 case Bytecodes::_arraylength: | |
| 926 set_method_escape(state.apop()); | |
| 927 state.spush(); | |
| 928 break; | |
| 929 case Bytecodes::_athrow: | |
| 930 set_global_escape(state.apop()); | |
| 931 fall_through = false; | |
| 932 break; | |
| 933 case Bytecodes::_checkcast: | |
| 934 { ArgumentMap obj = state.apop(); | |
| 935 set_method_escape(obj); | |
| 936 state.apush(obj); | |
| 937 } | |
| 938 break; | |
| 939 case Bytecodes::_instanceof: | |
| 940 set_method_escape(state.apop()); | |
| 941 state.spush(); | |
| 942 break; | |
| 943 case Bytecodes::_monitorenter: | |
| 944 case Bytecodes::_monitorexit: | |
| 945 state.apop(); | |
| 946 break; | |
| 947 case Bytecodes::_wide: | |
| 948 ShouldNotReachHere(); | |
| 949 break; | |
| 950 case Bytecodes::_ifnull: | |
| 951 case Bytecodes::_ifnonnull: | |
| 952 { | |
| 953 set_method_escape(state.apop()); | |
| 954 int dest_bci = s.get_dest(); | |
| 955 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 956 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 957 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 958 break; | |
| 959 } | |
| 960 case Bytecodes::_goto_w: | |
| 961 { | |
| 962 int dest_bci = s.get_far_dest(); | |
| 963 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 964 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 965 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 966 fall_through = false; | |
| 967 break; | |
| 968 } | |
| 969 case Bytecodes::_jsr_w: | |
| 970 { | |
| 971 int dest_bci = s.get_far_dest(); | |
| 972 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 973 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 974 state.apush(empty_map); | |
| 975 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 976 fall_through = false; | |
| 977 break; | |
| 978 } | |
| 979 case Bytecodes::_breakpoint: | |
| 980 break; | |
| 981 default: | |
| 982 ShouldNotReachHere(); | |
| 983 break; | |
| 984 } | |
| 985 | |
| 986 } | |
| 987 if (fall_through) { | |
| 988 int fall_through_bci = s.cur_bci(); | |
| 989 if (fall_through_bci < _method->code_size()) { | |
| 990 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
| 991 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
| 992 } | |
| 993 } | |
| 994 } | |
| 995 | |
| 996 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
|
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997 StateInfo *d_state = blockstates + dest->index(); |
| 0 | 998 int nlocals = _method->max_locals(); |
| 999 | |
| 1000 // exceptions may cause transfer of control to handlers in the middle of a | |
| 1001 // block, so we don't merge the incoming state of exception handlers | |
| 1002 if (dest->is_handler()) | |
| 1003 return; | |
| 1004 if (!d_state->_initialized ) { | |
| 1005 // destination not initialized, just copy | |
| 1006 for (int i = 0; i < nlocals; i++) { | |
| 1007 d_state->_vars[i] = s_state->_vars[i]; | |
| 1008 } | |
| 1009 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 1010 d_state->_stack[i] = s_state->_stack[i]; | |
| 1011 } | |
| 1012 d_state->_stack_height = s_state->_stack_height; | |
| 1013 d_state->_max_stack = s_state->_max_stack; | |
| 1014 d_state->_initialized = true; | |
| 1015 } else if (!dest->processed()) { | |
| 1016 // we have not yet walked the bytecodes of dest, we can merge | |
| 1017 // the states | |
| 1018 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 1019 for (int i = 0; i < nlocals; i++) { | |
| 1020 d_state->_vars[i].set_union(s_state->_vars[i]); | |
| 1021 } | |
| 1022 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 1023 d_state->_stack[i].set_union(s_state->_stack[i]); | |
| 1024 } | |
| 1025 } else { | |
| 1026 // the bytecodes of dest have already been processed, mark any | |
| 1027 // arguments in the source state which are not in the dest state | |
| 1028 // as global escape. | |
| 1029 // Future refinement: we only need to mark these variable to the | |
| 1030 // maximum escape of any variables in dest state | |
| 1031 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 1032 ArgumentMap extra_vars; | |
| 1033 for (int i = 0; i < nlocals; i++) { | |
| 1034 ArgumentMap t; | |
| 1035 t = s_state->_vars[i]; | |
| 1036 t.set_difference(d_state->_vars[i]); | |
| 1037 extra_vars.set_union(t); | |
| 1038 } | |
| 1039 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 1040 ArgumentMap t; | |
|
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1041 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
| 0 | 1042 t.clear(); |
| 1043 t = s_state->_stack[i]; | |
| 1044 t.set_difference(d_state->_stack[i]); | |
| 1045 extra_vars.set_union(t); | |
| 1046 } | |
|
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1047 set_global_escape(extra_vars, true); |
| 0 | 1048 } |
| 1049 } | |
| 1050 | |
| 1051 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
| 1052 int numblocks = _methodBlocks->num_blocks(); | |
| 1053 int stkSize = _method->max_stack(); | |
| 1054 int numLocals = _method->max_locals(); | |
| 1055 StateInfo state; | |
| 1056 | |
| 1057 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
| 1058 int datasize = datacount * sizeof(ArgumentMap); | |
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1059 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
| 0 | 1060 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
| 1061 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
| 1062 ArgumentMap *dp = statedata; | |
| 1063 state._vars = dp; | |
| 1064 dp += numLocals; | |
| 1065 state._stack = dp; | |
| 1066 dp += stkSize; | |
| 1067 state._initialized = false; | |
| 1068 state._max_stack = stkSize; | |
| 1069 for (int i = 0; i < numblocks; i++) { | |
| 1070 blockstates[i]._vars = dp; | |
| 1071 dp += numLocals; | |
| 1072 blockstates[i]._stack = dp; | |
| 1073 dp += stkSize; | |
| 1074 blockstates[i]._initialized = false; | |
| 1075 blockstates[i]._stack_height = 0; | |
| 1076 blockstates[i]._max_stack = stkSize; | |
| 1077 } | |
| 1078 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
| 1079 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
| 1080 | |
| 1081 _methodBlocks->clear_processed(); | |
| 1082 | |
| 1083 // initialize block 0 state from method signature | |
| 1084 ArgumentMap allVars; // all oop arguments to method | |
| 1085 ciSignature* sig = method()->signature(); | |
| 1086 int j = 0; | |
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1087 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1088 int fb_i = first_blk->index(); |
| 0 | 1089 if (!method()->is_static()) { |
| 1090 // record information for "this" | |
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1091 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1092 allVars.add(j); |
| 1093 j++; | |
| 1094 } | |
| 1095 for (int i = 0; i < sig->count(); i++) { | |
| 1096 ciType* t = sig->type_at(i); | |
| 1097 if (!t->is_primitive_type()) { | |
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1098 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1099 allVars.add(j); |
| 1100 } | |
| 1101 j += t->size(); | |
| 1102 } | |
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1103 blockstates[fb_i]._initialized = true; |
| 0 | 1104 assert(j == _arg_size, "just checking"); |
| 1105 | |
| 1106 ArgumentMap unknown_map; | |
| 1107 unknown_map.add_unknown(); | |
| 1108 | |
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1109 worklist.push(first_blk); |
| 0 | 1110 while(worklist.length() > 0) { |
| 1111 ciBlock *blk = worklist.pop(); | |
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1112 StateInfo *blkState = blockstates + blk->index(); |
| 0 | 1113 if (blk->is_handler() || blk->is_ret_target()) { |
| 1114 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1115 // that any variable could contain any argument |
| 0 | 1116 for (int i = 0; i < numLocals; i++) { |
| 1117 state._vars[i] = allVars; | |
| 1118 } | |
| 1119 if (blk->is_handler()) { | |
| 1120 state._stack_height = 1; | |
| 1121 } else { | |
| 1122 state._stack_height = blkState->_stack_height; | |
| 1123 } | |
| 1124 for (int i = 0; i < state._stack_height; i++) { | |
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1125 // ??? should this be unknown_map ??? |
| 0 | 1126 state._stack[i] = allVars; |
| 1127 } | |
| 1128 } else { | |
| 1129 for (int i = 0; i < numLocals; i++) { | |
| 1130 state._vars[i] = blkState->_vars[i]; | |
| 1131 } | |
| 1132 for (int i = 0; i < blkState->_stack_height; i++) { | |
| 1133 state._stack[i] = blkState->_stack[i]; | |
| 1134 } | |
| 1135 state._stack_height = blkState->_stack_height; | |
| 1136 } | |
| 1137 iterate_one_block(blk, state, successors); | |
| 1138 // if this block has any exception handlers, push them | |
| 1139 // onto successor list | |
| 1140 if (blk->has_handler()) { | |
| 1141 DEBUG_ONLY(int handler_count = 0;) | |
| 1142 int blk_start = blk->start_bci(); | |
| 1143 int blk_end = blk->limit_bci(); | |
| 1144 for (int i = 0; i < numblocks; i++) { | |
| 1145 ciBlock *b = _methodBlocks->block(i); | |
| 1146 if (b->is_handler()) { | |
| 1147 int ex_start = b->ex_start_bci(); | |
| 1148 int ex_end = b->ex_limit_bci(); | |
| 1149 if ((ex_start >= blk_start && ex_start < blk_end) || | |
| 1150 (ex_end > blk_start && ex_end <= blk_end)) { | |
| 1151 successors.push(b); | |
| 1152 } | |
| 1153 DEBUG_ONLY(handler_count++;) | |
| 1154 } | |
| 1155 } | |
| 1156 assert(handler_count > 0, "must find at least one handler"); | |
| 1157 } | |
| 1158 // merge computed variable state with successors | |
| 1159 while(successors.length() > 0) { | |
| 1160 ciBlock *succ = successors.pop(); | |
| 1161 merge_block_states(blockstates, succ, &state); | |
| 1162 if (!succ->processed()) | |
| 1163 worklist.push(succ); | |
| 1164 } | |
| 1165 } | |
| 1166 } | |
| 1167 | |
| 1168 bool BCEscapeAnalyzer::do_analysis() { | |
| 1169 Arena* arena = CURRENT_ENV->arena(); | |
| 1170 // identify basic blocks | |
| 1171 _methodBlocks = _method->get_method_blocks(); | |
| 1172 | |
| 1173 iterate_blocks(arena); | |
| 1174 // TEMPORARY | |
| 1175 return true; | |
| 1176 } | |
| 1177 | |
| 1178 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
| 1179 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
| 1180 | |
| 1181 if (iid == vmIntrinsics::_getClass || | |
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1182 iid == vmIntrinsics::_fillInStackTrace || |
| 0 | 1183 iid == vmIntrinsics::_hashCode) |
| 1184 return iid; | |
| 1185 else | |
| 1186 return vmIntrinsics::_none; | |
| 1187 } | |
| 1188 | |
| 1189 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1190 ArgumentMap arg; |
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1191 arg.clear(); |
| 0 | 1192 switch (iid) { |
| 1193 case vmIntrinsics::_getClass: | |
| 1194 _return_local = false; | |
| 1195 break; | |
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1196 case vmIntrinsics::_fillInStackTrace: |
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1197 arg.set(0); // 'this' |
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1198 set_returned(arg); |
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1199 break; |
| 0 | 1200 case vmIntrinsics::_hashCode: |
| 1201 // initialized state is correct | |
| 1202 break; | |
| 1203 default: | |
| 1204 assert(false, "unexpected intrinsic"); | |
| 1205 } | |
| 1206 return true; | |
| 1207 } | |
| 1208 | |
| 1209 void BCEscapeAnalyzer::initialize() { | |
| 1210 int i; | |
| 1211 | |
| 1212 // clear escape information (method may have been deoptimized) | |
| 1213 methodData()->clear_escape_info(); | |
| 1214 | |
| 1215 // initialize escape state of object parameters | |
| 1216 ciSignature* sig = method()->signature(); | |
| 1217 int j = 0; | |
| 1218 if (!method()->is_static()) { | |
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1219 _arg_local.set(0); |
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1220 _arg_stack.set(0); |
| 0 | 1221 j++; |
| 1222 } | |
| 1223 for (i = 0; i < sig->count(); i++) { | |
| 1224 ciType* t = sig->type_at(i); | |
| 1225 if (!t->is_primitive_type()) { | |
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1226 _arg_local.set(j); |
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1227 _arg_stack.set(j); |
| 0 | 1228 } |
| 1229 j += t->size(); | |
| 1230 } | |
| 1231 assert(j == _arg_size, "just checking"); | |
| 1232 | |
| 1233 // start with optimistic assumption | |
| 1234 ciType *rt = _method->return_type(); | |
| 1235 if (rt->is_primitive_type()) { | |
| 1236 _return_local = false; | |
| 1237 _return_allocated = false; | |
| 1238 } else { | |
| 1239 _return_local = true; | |
| 1240 _return_allocated = true; | |
| 1241 } | |
| 1242 _allocated_escapes = false; | |
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1243 _unknown_modified = false; |
| 0 | 1244 } |
| 1245 | |
| 1246 void BCEscapeAnalyzer::clear_escape_info() { | |
| 1247 ciSignature* sig = method()->signature(); | |
| 1248 int arg_count = sig->count(); | |
| 1249 ArgumentMap var; | |
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1250 if (!method()->is_static()) { |
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1251 arg_count++; // allow for "this" |
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1252 } |
| 0 | 1253 for (int i = 0; i < arg_count; i++) { |
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1254 set_arg_modified(i, OFFSET_ANY, 4); |
| 0 | 1255 var.clear(); |
| 1256 var.set(i); | |
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1257 set_modified(var, OFFSET_ANY, 4); |
| 0 | 1258 set_global_escape(var); |
| 1259 } | |
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1260 _arg_local.Clear(); |
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1261 _arg_stack.Clear(); |
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1262 _arg_returned.Clear(); |
| 0 | 1263 _return_local = false; |
| 1264 _return_allocated = false; | |
| 1265 _allocated_escapes = true; | |
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1266 _unknown_modified = true; |
| 0 | 1267 } |
| 1268 | |
| 1269 | |
| 1270 void BCEscapeAnalyzer::compute_escape_info() { | |
| 1271 int i; | |
| 1272 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
| 1273 | |
| 1274 vmIntrinsics::ID iid = known_intrinsic(); | |
| 1275 | |
| 1276 // check if method can be analyzed | |
| 1277 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
| 1278 || _level > MaxBCEAEstimateLevel | |
| 1279 || method()->code_size() > MaxBCEAEstimateSize)) { | |
| 1280 if (BCEATraceLevel >= 1) { | |
| 1281 tty->print("Skipping method because: "); | |
| 1282 if (method()->is_abstract()) | |
| 1283 tty->print_cr("method is abstract."); | |
| 1284 else if (method()->is_native()) | |
| 1285 tty->print_cr("method is native."); | |
| 1286 else if (!method()->holder()->is_initialized()) | |
| 1287 tty->print_cr("class of method is not initialized."); | |
| 1288 else if (_level > MaxBCEAEstimateLevel) | |
| 1289 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
| 1290 _level, MaxBCEAEstimateLevel); | |
| 1291 else if (method()->code_size() > MaxBCEAEstimateSize) | |
| 1292 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
| 1293 method()->code_size(), MaxBCEAEstimateSize); | |
| 1294 else | |
| 1295 ShouldNotReachHere(); | |
| 1296 } | |
| 1297 clear_escape_info(); | |
| 1298 | |
| 1299 return; | |
| 1300 } | |
| 1301 | |
| 1302 if (BCEATraceLevel >= 1) { | |
| 1303 tty->print("[EA] estimating escape information for"); | |
| 1304 if (iid != vmIntrinsics::_none) | |
| 1305 tty->print(" intrinsic"); | |
| 1306 method()->print_short_name(); | |
| 1307 tty->print_cr(" (%d bytes)", method()->code_size()); | |
| 1308 } | |
| 1309 | |
| 1310 bool success; | |
| 1311 | |
| 1312 initialize(); | |
| 1313 | |
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1314 // Do not scan method if it has no object parameters and |
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1315 // does not returns an object (_return_allocated is set in initialize()). |
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1316 if (_arg_local.Size() == 0 && !_return_allocated) { |
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1317 // Clear all info since method's bytecode was not analysed and |
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1318 // set pessimistic escape information. |
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1319 clear_escape_info(); |
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1320 methodData()->set_eflag(MethodData::allocated_escapes); |
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1321 methodData()->set_eflag(MethodData::unknown_modified); |
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1322 methodData()->set_eflag(MethodData::estimated); |
| 0 | 1323 return; |
| 1324 } | |
| 1325 | |
| 1326 if (iid != vmIntrinsics::_none) | |
| 1327 success = compute_escape_for_intrinsic(iid); | |
| 1328 else { | |
| 1329 success = do_analysis(); | |
| 1330 } | |
| 1331 | |
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1332 // don't store interprocedural escape information if it introduces |
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1333 // dependencies or if method data is empty |
| 0 | 1334 // |
| 1335 if (!has_dependencies() && !methodData()->is_empty()) { | |
| 1336 for (i = 0; i < _arg_size; i++) { | |
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1337 if (_arg_local.test(i)) { |
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1338 assert(_arg_stack.test(i), "inconsistent escape info"); |
| 0 | 1339 methodData()->set_arg_local(i); |
| 1340 methodData()->set_arg_stack(i); | |
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1341 } else if (_arg_stack.test(i)) { |
| 0 | 1342 methodData()->set_arg_stack(i); |
| 1343 } | |
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1344 if (_arg_returned.test(i)) { |
| 0 | 1345 methodData()->set_arg_returned(i); |
| 1346 } | |
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1347 methodData()->set_arg_modified(i, _arg_modified[i]); |
| 0 | 1348 } |
| 1349 if (_return_local) { | |
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1350 methodData()->set_eflag(MethodData::return_local); |
| 0 | 1351 } |
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1352 if (_return_allocated) { |
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1353 methodData()->set_eflag(MethodData::return_allocated); |
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1354 } |
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1355 if (_allocated_escapes) { |
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1356 methodData()->set_eflag(MethodData::allocated_escapes); |
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1357 } |
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1358 if (_unknown_modified) { |
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1359 methodData()->set_eflag(MethodData::unknown_modified); |
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1360 } |
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1361 methodData()->set_eflag(MethodData::estimated); |
| 0 | 1362 } |
| 1363 } | |
| 1364 | |
| 1365 void BCEscapeAnalyzer::read_escape_info() { | |
| 1366 assert(methodData()->has_escape_info(), "no escape info available"); | |
| 1367 | |
| 1368 // read escape information from method descriptor | |
| 1369 for (int i = 0; i < _arg_size; i++) { | |
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1370 if (methodData()->is_arg_local(i)) |
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1371 _arg_local.set(i); |
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1372 if (methodData()->is_arg_stack(i)) |
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1373 _arg_stack.set(i); |
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1374 if (methodData()->is_arg_returned(i)) |
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1375 _arg_returned.set(i); |
|
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1376 _arg_modified[i] = methodData()->arg_modified(i); |
| 0 | 1377 } |
|
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1378 _return_local = methodData()->eflag_set(MethodData::return_local); |
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1379 _return_allocated = methodData()->eflag_set(MethodData::return_allocated); |
|
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1380 _allocated_escapes = methodData()->eflag_set(MethodData::allocated_escapes); |
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1381 _unknown_modified = methodData()->eflag_set(MethodData::unknown_modified); |
| 0 | 1382 |
| 1383 } | |
| 1384 | |
|
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1385 #ifndef PRODUCT |
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1386 void BCEscapeAnalyzer::dump() { |
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1387 tty->print("[EA] estimated escape information for"); |
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1388 method()->print_short_name(); |
|
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1389 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1390 tty->print(" non-escaping args: "); |
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1391 _arg_local.print_on(tty); |
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1392 tty->print(" stack-allocatable args: "); |
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1393 _arg_stack.print_on(tty); |
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1394 if (_return_local) { |
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1395 tty->print(" returned args: "); |
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1396 _arg_returned.print_on(tty); |
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1397 } else if (is_return_allocated()) { |
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1398 tty->print_cr(" return allocated value"); |
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1399 } else { |
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1400 tty->print_cr(" return non-local value"); |
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1401 } |
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1402 tty->print(" modified args: "); |
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1403 for (int i = 0; i < _arg_size; i++) { |
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1404 if (_arg_modified[i] == 0) |
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1405 tty->print(" 0"); |
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1406 else |
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1407 tty->print(" 0x%x", _arg_modified[i]); |
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1408 } |
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1409 tty->cr(); |
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1410 tty->print(" flags: "); |
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1411 if (_return_allocated) |
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1412 tty->print(" return_allocated"); |
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1413 if (_allocated_escapes) |
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1414 tty->print(" allocated_escapes"); |
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1415 if (_unknown_modified) |
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1416 tty->print(" unknown_modified"); |
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1417 tty->cr(); |
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1418 } |
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|
1419 #endif |
| 0 | 1420 |
| 1421 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
| 1422 : _conservative(method == NULL || !EstimateArgEscape) | |
|
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1423 , _arena(CURRENT_ENV->arena()) |
| 0 | 1424 , _method(method) |
| 1425 , _methodData(method ? method->method_data() : NULL) | |
| 1426 , _arg_size(method ? method->arg_size() : 0) | |
|
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1427 , _arg_local(_arena) |
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1428 , _arg_stack(_arena) |
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1429 , _arg_returned(_arena) |
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1430 , _dirty(_arena) |
| 0 | 1431 , _return_local(false) |
| 1432 , _return_allocated(false) | |
| 1433 , _allocated_escapes(false) | |
|
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1434 , _unknown_modified(false) |
|
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1435 , _dependencies(_arena, 4, 0, NULL) |
| 0 | 1436 , _parent(parent) |
| 1437 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
| 1438 if (!_conservative) { | |
|
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1439 _arg_local.Clear(); |
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|
1440 _arg_stack.Clear(); |
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|
1441 _arg_returned.Clear(); |
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1442 _dirty.Clear(); |
| 0 | 1443 Arena* arena = CURRENT_ENV->arena(); |
|
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1444 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1445 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
| 0 | 1446 |
| 1447 if (methodData() == NULL) | |
| 1448 return; | |
| 1449 bool printit = _method->should_print_assembly(); | |
| 1450 if (methodData()->has_escape_info()) { | |
| 1451 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
| 1452 method->holder()->name()->as_utf8(), | |
| 1453 method->name()->as_utf8())); | |
| 1454 read_escape_info(); | |
| 1455 } else { | |
| 1456 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
| 1457 method->holder()->name()->as_utf8(), | |
| 1458 method->name()->as_utf8())); | |
| 1459 | |
| 1460 compute_escape_info(); | |
| 1461 methodData()->update_escape_info(); | |
| 1462 } | |
|
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1463 #ifndef PRODUCT |
|
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1464 if (BCEATraceLevel >= 3) { |
|
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1465 // dump escape information |
|
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1466 dump(); |
|
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1467 } |
|
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1468 #endif |
| 0 | 1469 } |
| 1470 } | |
| 1471 | |
| 1472 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
|
1397
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1473 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
|
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1474 // Also record evol dependencies so redefinition of the |
|
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1475 // callee will trigger recompilation. |
|
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|
1476 deps->assert_evol_method(method()); |
|
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|
1477 } |
| 0 | 1478 for (int i = 0; i < _dependencies.length(); i+=2) { |
|
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|
1479 ciKlass *k = _dependencies.at(i)->as_klass(); |
|
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|
1480 ciMethod *m = _dependencies.at(i+1)->as_method(); |
| 0 | 1481 deps->assert_unique_concrete_method(k, m); |
| 1482 } | |
| 1483 } |