Mercurial > hg > graal-jvmci-8
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Mon, 18 Sep 2017 18:49:45 +0200 |
| parents | dd9cc155639c |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2014, 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 | |
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45 // Maintain a map of which arguments a local variable or |
| 0 | 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; | |
| 20729 | 92 int _stack_height; |
| 93 int _max_stack; | |
| 0 | 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); | |
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161 if (vars.contains_allocated()) { |
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162 _allocated_escapes = true; |
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163 } |
| 0 | 164 } |
| 165 | |
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166 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) { |
| 0 | 167 clear_bits(vars, _arg_local); |
| 168 clear_bits(vars, _arg_stack); | |
| 169 if (vars.contains_allocated()) | |
| 170 _allocated_escapes = true; | |
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171 |
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172 if (merge && !vars.is_empty()) { |
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173 // Merge new state into already processed block. |
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174 // New state is not taken into account and |
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175 // it may invalidate set_returned() result. |
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176 if (vars.contains_unknown() || vars.contains_allocated()) { |
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177 _return_local = false; |
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178 } |
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179 if (vars.contains_unknown() || vars.contains_vars()) { |
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180 _return_allocated = false; |
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181 } |
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182 if (_return_local && vars.contains_vars() && !returns_all(vars)) { |
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183 // Return result should be invalidated if args in new |
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184 // state are not recorded in return state. |
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185 _return_local = false; |
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186 } |
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187 } |
| 0 | 188 } |
| 189 | |
| 190 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
| 191 clear_bits(vars, _dirty); | |
| 192 } | |
| 193 | |
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194 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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195 |
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196 for (int i = 0; i < _arg_size; i++) { |
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197 if (vars.contains(i)) { |
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198 set_arg_modified(i, offs, size); |
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199 } |
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200 } |
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201 if (vars.contains_unknown()) |
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202 _unknown_modified = true; |
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203 } |
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204 |
| 0 | 205 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
| 206 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
| 207 if (scope->method() == callee) { | |
| 208 return true; | |
| 209 } | |
| 210 } | |
| 211 return false; | |
| 212 } | |
| 213 | |
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214 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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215 if (offset == OFFSET_ANY) |
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216 return _arg_modified[arg] != 0; |
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217 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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218 bool modified = false; |
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219 int l = offset / HeapWordSize; |
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220 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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221 if (l > ARG_OFFSET_MAX) |
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222 l = ARG_OFFSET_MAX; |
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223 if (h > ARG_OFFSET_MAX+1) |
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224 h = ARG_OFFSET_MAX + 1; |
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225 for (int i = l; i < h; i++) { |
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226 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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227 } |
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228 return modified; |
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229 } |
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230 |
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231 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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232 if (offset == OFFSET_ANY) { |
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233 _arg_modified[arg] = (uint) -1; |
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234 return; |
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235 } |
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236 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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237 int l = offset / HeapWordSize; |
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238 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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239 if (l > ARG_OFFSET_MAX) |
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240 l = ARG_OFFSET_MAX; |
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241 if (h > ARG_OFFSET_MAX+1) |
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242 h = ARG_OFFSET_MAX + 1; |
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243 for (int i = l; i < h; i++) { |
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244 _arg_modified[arg] |= (1 << i); |
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245 } |
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246 } |
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247 |
| 0 | 248 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
| 249 int i; | |
| 250 | |
| 251 // retrieve information about the callee | |
| 252 ciInstanceKlass* klass = target->holder(); | |
| 253 ciInstanceKlass* calling_klass = method()->holder(); | |
| 254 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
| 255 ciInstanceKlass* actual_recv = callee_holder; | |
| 256 | |
|
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257 // Some methods are obviously bindable without any type checks so |
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258 // convert them directly to an invokespecial or invokestatic. |
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259 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { |
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260 switch (code) { |
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261 case Bytecodes::_invokevirtual: |
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262 code = Bytecodes::_invokespecial; |
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263 break; |
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264 case Bytecodes::_invokehandle: |
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265 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; |
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266 break; |
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267 } |
|
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268 } |
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269 |
| 0 | 270 // compute size of arguments |
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271 int arg_size = target->invoke_arg_size(code); |
| 0 | 272 int arg_base = MAX2(state._stack_height - arg_size, 0); |
| 273 | |
| 274 // direct recursive calls are skipped if they can be bound statically without introducing | |
| 275 // dependencies and if parameters are passed at the same position as in the current method | |
| 276 // other calls are skipped if there are no unescaped arguments passed to them | |
| 277 bool directly_recursive = (method() == target) && | |
| 278 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
| 279 | |
| 280 // check if analysis of callee can safely be skipped | |
| 281 bool skip_callee = true; | |
| 282 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
| 283 ArgumentMap arg = state._stack[i]; | |
| 284 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
| 285 } | |
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286 // For now we conservatively skip invokedynamic. |
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287 if (code == Bytecodes::_invokedynamic) { |
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288 skip_callee = true; |
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289 } |
| 0 | 290 if (skip_callee) { |
| 291 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
| 292 for (i = 0; i < arg_size; i++) { | |
| 293 set_method_escape(state.raw_pop()); | |
| 294 } | |
|
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295 _unknown_modified = true; // assume the worst since we don't analyze the called method |
| 0 | 296 return; |
| 297 } | |
| 298 | |
| 299 // determine actual method (use CHA if necessary) | |
| 300 ciMethod* inline_target = NULL; | |
| 301 if (target->is_loaded() && klass->is_loaded() | |
| 302 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
| 6973 | 303 && target->is_loaded()) { |
| 0 | 304 if (code == Bytecodes::_invokestatic |
| 305 || code == Bytecodes::_invokespecial | |
| 306 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
| 307 inline_target = target; | |
| 308 } else { | |
| 309 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
| 310 } | |
| 311 } | |
| 312 | |
| 313 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
| 314 // analyze callee | |
| 315 BCEscapeAnalyzer analyzer(inline_target, this); | |
| 316 | |
| 317 // adjust escape state of actual parameters | |
| 318 bool must_record_dependencies = false; | |
| 319 for (i = arg_size - 1; i >= 0; i--) { | |
| 320 ArgumentMap arg = state.raw_pop(); | |
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321 // Check if callee arg is a caller arg or an allocated object |
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322 bool allocated = arg.contains_allocated(); |
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323 if (!(is_argument(arg) || allocated)) |
| 0 | 324 continue; |
|
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325 for (int j = 0; j < _arg_size; j++) { |
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326 if (arg.contains(j)) { |
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327 _arg_modified[j] |= analyzer._arg_modified[i]; |
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328 } |
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329 } |
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330 if (!(is_arg_stack(arg) || allocated)) { |
| 0 | 331 // arguments have already been recognized as escaping |
| 332 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
| 333 set_method_escape(arg); | |
| 334 must_record_dependencies = true; | |
| 335 } else { | |
| 336 set_global_escape(arg); | |
| 337 } | |
| 338 } | |
|
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339 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
| 0 | 340 |
| 341 // record dependencies if at least one parameter retained stack-allocatable | |
| 342 if (must_record_dependencies) { | |
| 343 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
| 344 _dependencies.append(actual_recv); | |
| 345 _dependencies.append(inline_target); | |
| 346 } | |
| 347 _dependencies.appendAll(analyzer.dependencies()); | |
| 348 } | |
| 349 } else { | |
| 350 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
| 351 target->name()->as_utf8())); | |
| 352 // conservatively mark all actual parameters as escaping globally | |
| 353 for (i = 0; i < arg_size; i++) { | |
| 354 ArgumentMap arg = state.raw_pop(); | |
| 355 if (!is_argument(arg)) | |
| 356 continue; | |
|
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357 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 358 set_global_escape(arg); |
| 359 } | |
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360 _unknown_modified = true; // assume the worst since we don't know the called method |
| 0 | 361 } |
| 362 } | |
| 363 | |
| 364 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
| 365 return ((~arg_set1) | arg_set2) == 0; | |
| 366 } | |
| 367 | |
| 368 | |
| 369 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
| 370 | |
| 371 blk->set_processed(); | |
| 372 ciBytecodeStream s(method()); | |
| 373 int limit_bci = blk->limit_bci(); | |
| 374 bool fall_through = false; | |
| 375 ArgumentMap allocated_obj; | |
| 376 allocated_obj.add_allocated(); | |
| 377 ArgumentMap unknown_obj; | |
| 378 unknown_obj.add_unknown(); | |
| 379 ArgumentMap empty_map; | |
| 380 | |
| 381 s.reset_to_bci(blk->start_bci()); | |
| 382 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
| 383 fall_through = true; | |
| 384 switch (s.cur_bc()) { | |
| 385 case Bytecodes::_nop: | |
| 386 break; | |
| 387 case Bytecodes::_aconst_null: | |
|
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388 state.apush(unknown_obj); |
| 0 | 389 break; |
| 390 case Bytecodes::_iconst_m1: | |
| 391 case Bytecodes::_iconst_0: | |
| 392 case Bytecodes::_iconst_1: | |
| 393 case Bytecodes::_iconst_2: | |
| 394 case Bytecodes::_iconst_3: | |
| 395 case Bytecodes::_iconst_4: | |
| 396 case Bytecodes::_iconst_5: | |
| 397 case Bytecodes::_fconst_0: | |
| 398 case Bytecodes::_fconst_1: | |
| 399 case Bytecodes::_fconst_2: | |
| 400 case Bytecodes::_bipush: | |
| 401 case Bytecodes::_sipush: | |
| 402 state.spush(); | |
| 403 break; | |
| 404 case Bytecodes::_lconst_0: | |
| 405 case Bytecodes::_lconst_1: | |
| 406 case Bytecodes::_dconst_0: | |
| 407 case Bytecodes::_dconst_1: | |
| 408 state.lpush(); | |
| 409 break; | |
| 410 case Bytecodes::_ldc: | |
| 411 case Bytecodes::_ldc_w: | |
| 412 case Bytecodes::_ldc2_w: | |
|
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413 { |
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414 // Avoid calling get_constant() which will try to allocate |
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415 // unloaded constant. We need only constant's type. |
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416 int index = s.get_constant_pool_index(); |
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417 constantTag tag = s.get_constant_pool_tag(index); |
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418 if (tag.is_long() || tag.is_double()) { |
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419 // Only longs and doubles use 2 stack slots. |
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420 state.lpush(); |
|
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421 } else if (tag.basic_type() == T_OBJECT) { |
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422 state.apush(unknown_obj); |
|
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423 } else { |
| 0 | 424 state.spush(); |
| 425 } | |
| 426 break; | |
|
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427 } |
| 0 | 428 case Bytecodes::_aload: |
| 429 state.apush(state._vars[s.get_index()]); | |
| 430 break; | |
| 431 case Bytecodes::_iload: | |
| 432 case Bytecodes::_fload: | |
| 433 case Bytecodes::_iload_0: | |
| 434 case Bytecodes::_iload_1: | |
| 435 case Bytecodes::_iload_2: | |
| 436 case Bytecodes::_iload_3: | |
| 437 case Bytecodes::_fload_0: | |
| 438 case Bytecodes::_fload_1: | |
| 439 case Bytecodes::_fload_2: | |
| 440 case Bytecodes::_fload_3: | |
| 441 state.spush(); | |
| 442 break; | |
| 443 case Bytecodes::_lload: | |
| 444 case Bytecodes::_dload: | |
| 445 case Bytecodes::_lload_0: | |
| 446 case Bytecodes::_lload_1: | |
| 447 case Bytecodes::_lload_2: | |
| 448 case Bytecodes::_lload_3: | |
| 449 case Bytecodes::_dload_0: | |
| 450 case Bytecodes::_dload_1: | |
| 451 case Bytecodes::_dload_2: | |
| 452 case Bytecodes::_dload_3: | |
| 453 state.lpush(); | |
| 454 break; | |
| 455 case Bytecodes::_aload_0: | |
| 456 state.apush(state._vars[0]); | |
| 457 break; | |
| 458 case Bytecodes::_aload_1: | |
| 459 state.apush(state._vars[1]); | |
| 460 break; | |
| 461 case Bytecodes::_aload_2: | |
| 462 state.apush(state._vars[2]); | |
| 463 break; | |
| 464 case Bytecodes::_aload_3: | |
| 465 state.apush(state._vars[3]); | |
| 466 break; | |
| 467 case Bytecodes::_iaload: | |
| 468 case Bytecodes::_faload: | |
| 469 case Bytecodes::_baload: | |
| 470 case Bytecodes::_caload: | |
| 471 case Bytecodes::_saload: | |
| 472 state.spop(); | |
| 473 set_method_escape(state.apop()); | |
| 474 state.spush(); | |
| 475 break; | |
| 476 case Bytecodes::_laload: | |
| 477 case Bytecodes::_daload: | |
| 478 state.spop(); | |
| 479 set_method_escape(state.apop()); | |
| 480 state.lpush(); | |
| 481 break; | |
| 482 case Bytecodes::_aaload: | |
| 483 { state.spop(); | |
| 484 ArgumentMap array = state.apop(); | |
| 485 set_method_escape(array); | |
| 486 state.apush(unknown_obj); | |
| 487 set_dirty(array); | |
| 488 } | |
| 489 break; | |
| 490 case Bytecodes::_istore: | |
| 491 case Bytecodes::_fstore: | |
| 492 case Bytecodes::_istore_0: | |
| 493 case Bytecodes::_istore_1: | |
| 494 case Bytecodes::_istore_2: | |
| 495 case Bytecodes::_istore_3: | |
| 496 case Bytecodes::_fstore_0: | |
| 497 case Bytecodes::_fstore_1: | |
| 498 case Bytecodes::_fstore_2: | |
| 499 case Bytecodes::_fstore_3: | |
| 500 state.spop(); | |
| 501 break; | |
| 502 case Bytecodes::_lstore: | |
| 503 case Bytecodes::_dstore: | |
| 504 case Bytecodes::_lstore_0: | |
| 505 case Bytecodes::_lstore_1: | |
| 506 case Bytecodes::_lstore_2: | |
| 507 case Bytecodes::_lstore_3: | |
| 508 case Bytecodes::_dstore_0: | |
| 509 case Bytecodes::_dstore_1: | |
| 510 case Bytecodes::_dstore_2: | |
| 511 case Bytecodes::_dstore_3: | |
| 512 state.lpop(); | |
| 513 break; | |
| 514 case Bytecodes::_astore: | |
| 515 state._vars[s.get_index()] = state.apop(); | |
| 516 break; | |
| 517 case Bytecodes::_astore_0: | |
| 518 state._vars[0] = state.apop(); | |
| 519 break; | |
| 520 case Bytecodes::_astore_1: | |
| 521 state._vars[1] = state.apop(); | |
| 522 break; | |
| 523 case Bytecodes::_astore_2: | |
| 524 state._vars[2] = state.apop(); | |
| 525 break; | |
| 526 case Bytecodes::_astore_3: | |
| 527 state._vars[3] = state.apop(); | |
| 528 break; | |
| 529 case Bytecodes::_iastore: | |
| 530 case Bytecodes::_fastore: | |
| 531 case Bytecodes::_bastore: | |
| 532 case Bytecodes::_castore: | |
| 533 case Bytecodes::_sastore: | |
| 534 { | |
| 535 state.spop(); | |
| 536 state.spop(); | |
| 537 ArgumentMap arr = state.apop(); | |
| 538 set_method_escape(arr); | |
|
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539 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
| 0 | 540 break; |
| 541 } | |
| 542 case Bytecodes::_lastore: | |
| 543 case Bytecodes::_dastore: | |
| 544 { | |
| 545 state.lpop(); | |
| 546 state.spop(); | |
| 547 ArgumentMap arr = state.apop(); | |
| 548 set_method_escape(arr); | |
|
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549 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
| 0 | 550 break; |
| 551 } | |
| 552 case Bytecodes::_aastore: | |
| 553 { | |
| 554 set_global_escape(state.apop()); | |
| 555 state.spop(); | |
| 556 ArgumentMap arr = state.apop(); | |
|
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557 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
| 0 | 558 break; |
| 559 } | |
| 560 case Bytecodes::_pop: | |
| 561 state.raw_pop(); | |
| 562 break; | |
| 563 case Bytecodes::_pop2: | |
| 564 state.raw_pop(); | |
| 565 state.raw_pop(); | |
| 566 break; | |
| 567 case Bytecodes::_dup: | |
| 568 { ArgumentMap w1 = state.raw_pop(); | |
| 569 state.raw_push(w1); | |
| 570 state.raw_push(w1); | |
| 571 } | |
| 572 break; | |
| 573 case Bytecodes::_dup_x1: | |
| 574 { ArgumentMap w1 = state.raw_pop(); | |
| 575 ArgumentMap w2 = state.raw_pop(); | |
| 576 state.raw_push(w1); | |
| 577 state.raw_push(w2); | |
| 578 state.raw_push(w1); | |
| 579 } | |
| 580 break; | |
| 581 case Bytecodes::_dup_x2: | |
| 582 { ArgumentMap w1 = state.raw_pop(); | |
| 583 ArgumentMap w2 = state.raw_pop(); | |
| 584 ArgumentMap w3 = state.raw_pop(); | |
| 585 state.raw_push(w1); | |
| 586 state.raw_push(w3); | |
| 587 state.raw_push(w2); | |
| 588 state.raw_push(w1); | |
| 589 } | |
| 590 break; | |
| 591 case Bytecodes::_dup2: | |
| 592 { ArgumentMap w1 = state.raw_pop(); | |
| 593 ArgumentMap w2 = state.raw_pop(); | |
| 594 state.raw_push(w2); | |
| 595 state.raw_push(w1); | |
| 596 state.raw_push(w2); | |
| 597 state.raw_push(w1); | |
| 598 } | |
| 599 break; | |
| 600 case Bytecodes::_dup2_x1: | |
| 601 { ArgumentMap w1 = state.raw_pop(); | |
| 602 ArgumentMap w2 = state.raw_pop(); | |
| 603 ArgumentMap w3 = state.raw_pop(); | |
| 604 state.raw_push(w2); | |
| 605 state.raw_push(w1); | |
| 606 state.raw_push(w3); | |
| 607 state.raw_push(w2); | |
| 608 state.raw_push(w1); | |
| 609 } | |
| 610 break; | |
| 611 case Bytecodes::_dup2_x2: | |
| 612 { ArgumentMap w1 = state.raw_pop(); | |
| 613 ArgumentMap w2 = state.raw_pop(); | |
| 614 ArgumentMap w3 = state.raw_pop(); | |
| 615 ArgumentMap w4 = state.raw_pop(); | |
| 616 state.raw_push(w2); | |
| 617 state.raw_push(w1); | |
| 618 state.raw_push(w4); | |
| 619 state.raw_push(w3); | |
| 620 state.raw_push(w2); | |
| 621 state.raw_push(w1); | |
| 622 } | |
| 623 break; | |
| 624 case Bytecodes::_swap: | |
| 625 { ArgumentMap w1 = state.raw_pop(); | |
| 626 ArgumentMap w2 = state.raw_pop(); | |
| 627 state.raw_push(w1); | |
| 628 state.raw_push(w2); | |
| 629 } | |
| 630 break; | |
| 631 case Bytecodes::_iadd: | |
| 632 case Bytecodes::_fadd: | |
| 633 case Bytecodes::_isub: | |
| 634 case Bytecodes::_fsub: | |
| 635 case Bytecodes::_imul: | |
| 636 case Bytecodes::_fmul: | |
| 637 case Bytecodes::_idiv: | |
| 638 case Bytecodes::_fdiv: | |
| 639 case Bytecodes::_irem: | |
| 640 case Bytecodes::_frem: | |
| 641 case Bytecodes::_iand: | |
| 642 case Bytecodes::_ior: | |
| 643 case Bytecodes::_ixor: | |
| 644 state.spop(); | |
| 645 state.spop(); | |
| 646 state.spush(); | |
| 647 break; | |
| 648 case Bytecodes::_ladd: | |
| 649 case Bytecodes::_dadd: | |
| 650 case Bytecodes::_lsub: | |
| 651 case Bytecodes::_dsub: | |
| 652 case Bytecodes::_lmul: | |
| 653 case Bytecodes::_dmul: | |
| 654 case Bytecodes::_ldiv: | |
| 655 case Bytecodes::_ddiv: | |
| 656 case Bytecodes::_lrem: | |
| 657 case Bytecodes::_drem: | |
| 658 case Bytecodes::_land: | |
| 659 case Bytecodes::_lor: | |
| 660 case Bytecodes::_lxor: | |
| 661 state.lpop(); | |
| 662 state.lpop(); | |
| 663 state.lpush(); | |
| 664 break; | |
| 665 case Bytecodes::_ishl: | |
| 666 case Bytecodes::_ishr: | |
| 667 case Bytecodes::_iushr: | |
| 668 state.spop(); | |
| 669 state.spop(); | |
| 670 state.spush(); | |
| 671 break; | |
| 672 case Bytecodes::_lshl: | |
| 673 case Bytecodes::_lshr: | |
| 674 case Bytecodes::_lushr: | |
| 675 state.spop(); | |
| 676 state.lpop(); | |
| 677 state.lpush(); | |
| 678 break; | |
| 679 case Bytecodes::_ineg: | |
| 680 case Bytecodes::_fneg: | |
| 681 state.spop(); | |
| 682 state.spush(); | |
| 683 break; | |
| 684 case Bytecodes::_lneg: | |
| 685 case Bytecodes::_dneg: | |
| 686 state.lpop(); | |
| 687 state.lpush(); | |
| 688 break; | |
| 689 case Bytecodes::_iinc: | |
| 690 break; | |
| 691 case Bytecodes::_i2l: | |
| 692 case Bytecodes::_i2d: | |
| 693 case Bytecodes::_f2l: | |
| 694 case Bytecodes::_f2d: | |
| 695 state.spop(); | |
| 696 state.lpush(); | |
| 697 break; | |
| 698 case Bytecodes::_i2f: | |
| 699 case Bytecodes::_f2i: | |
| 700 state.spop(); | |
| 701 state.spush(); | |
| 702 break; | |
| 703 case Bytecodes::_l2i: | |
| 704 case Bytecodes::_l2f: | |
| 705 case Bytecodes::_d2i: | |
| 706 case Bytecodes::_d2f: | |
| 707 state.lpop(); | |
| 708 state.spush(); | |
| 709 break; | |
| 710 case Bytecodes::_l2d: | |
| 711 case Bytecodes::_d2l: | |
| 712 state.lpop(); | |
| 713 state.lpush(); | |
| 714 break; | |
| 715 case Bytecodes::_i2b: | |
| 716 case Bytecodes::_i2c: | |
| 717 case Bytecodes::_i2s: | |
| 718 state.spop(); | |
| 719 state.spush(); | |
| 720 break; | |
| 721 case Bytecodes::_lcmp: | |
| 722 case Bytecodes::_dcmpl: | |
| 723 case Bytecodes::_dcmpg: | |
| 724 state.lpop(); | |
| 725 state.lpop(); | |
| 726 state.spush(); | |
| 727 break; | |
| 728 case Bytecodes::_fcmpl: | |
| 729 case Bytecodes::_fcmpg: | |
| 730 state.spop(); | |
| 731 state.spop(); | |
| 732 state.spush(); | |
| 733 break; | |
| 734 case Bytecodes::_ifeq: | |
| 735 case Bytecodes::_ifne: | |
| 736 case Bytecodes::_iflt: | |
| 737 case Bytecodes::_ifge: | |
| 738 case Bytecodes::_ifgt: | |
| 739 case Bytecodes::_ifle: | |
| 740 { | |
| 741 state.spop(); | |
| 742 int dest_bci = s.get_dest(); | |
| 743 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 744 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 745 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 746 break; | |
| 747 } | |
| 748 case Bytecodes::_if_icmpeq: | |
| 749 case Bytecodes::_if_icmpne: | |
| 750 case Bytecodes::_if_icmplt: | |
| 751 case Bytecodes::_if_icmpge: | |
| 752 case Bytecodes::_if_icmpgt: | |
| 753 case Bytecodes::_if_icmple: | |
| 754 { | |
| 755 state.spop(); | |
| 756 state.spop(); | |
| 757 int dest_bci = s.get_dest(); | |
| 758 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 759 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 760 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 761 break; | |
| 762 } | |
| 763 case Bytecodes::_if_acmpeq: | |
| 764 case Bytecodes::_if_acmpne: | |
| 765 { | |
| 766 set_method_escape(state.apop()); | |
| 767 set_method_escape(state.apop()); | |
| 768 int dest_bci = s.get_dest(); | |
| 769 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 770 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 771 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 772 break; | |
| 773 } | |
| 774 case Bytecodes::_goto: | |
| 775 { | |
| 776 int dest_bci = s.get_dest(); | |
| 777 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 778 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 779 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 780 fall_through = false; | |
| 781 break; | |
| 782 } | |
| 783 case Bytecodes::_jsr: | |
| 784 { | |
| 785 int dest_bci = s.get_dest(); | |
| 786 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 787 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 788 state.apush(empty_map); | |
| 789 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 790 fall_through = false; | |
| 791 break; | |
| 792 } | |
| 793 case Bytecodes::_ret: | |
| 794 // we don't track the destination of a "ret" instruction | |
| 795 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 796 fall_through = false; | |
| 797 break; | |
| 798 case Bytecodes::_return: | |
| 799 assert(s.next_bci() == limit_bci, "return must end block"); | |
| 800 fall_through = false; | |
| 801 break; | |
| 802 case Bytecodes::_tableswitch: | |
| 803 { | |
| 804 state.spop(); | |
| 2142 | 805 Bytecode_tableswitch sw(&s); |
| 806 int len = sw.length(); | |
| 0 | 807 int dest_bci; |
| 808 for (int i = 0; i < len; i++) { | |
| 2142 | 809 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
| 0 | 810 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 811 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 812 } | |
| 2142 | 813 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 814 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 815 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 816 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 817 fall_through = false; | |
| 818 break; | |
| 819 } | |
| 820 case Bytecodes::_lookupswitch: | |
| 821 { | |
| 822 state.spop(); | |
| 2142 | 823 Bytecode_lookupswitch sw(&s); |
| 824 int len = sw.number_of_pairs(); | |
| 0 | 825 int dest_bci; |
| 826 for (int i = 0; i < len; i++) { | |
| 2142 | 827 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
| 0 | 828 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 829 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 830 } | |
| 2142 | 831 dest_bci = s.cur_bci() + sw.default_offset(); |
| 0 | 832 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
| 833 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 834 fall_through = false; | |
| 835 break; | |
| 836 } | |
| 837 case Bytecodes::_ireturn: | |
| 838 case Bytecodes::_freturn: | |
| 839 state.spop(); | |
| 840 fall_through = false; | |
| 841 break; | |
| 842 case Bytecodes::_lreturn: | |
| 843 case Bytecodes::_dreturn: | |
| 844 state.lpop(); | |
| 845 fall_through = false; | |
| 846 break; | |
| 847 case Bytecodes::_areturn: | |
| 848 set_returned(state.apop()); | |
| 849 fall_through = false; | |
| 850 break; | |
| 851 case Bytecodes::_getstatic: | |
| 852 case Bytecodes::_getfield: | |
|
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853 { bool ignored_will_link; |
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854 ciField* field = s.get_field(ignored_will_link); |
| 0 | 855 BasicType field_type = field->type()->basic_type(); |
| 856 if (s.cur_bc() != Bytecodes::_getstatic) { | |
| 857 set_method_escape(state.apop()); | |
| 858 } | |
| 859 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 860 state.apush(unknown_obj); | |
| 861 } else if (type2size[field_type] == 1) { | |
| 862 state.spush(); | |
| 863 } else { | |
| 864 state.lpush(); | |
| 865 } | |
| 866 } | |
| 867 break; | |
| 868 case Bytecodes::_putstatic: | |
| 869 case Bytecodes::_putfield: | |
| 870 { bool will_link; | |
| 871 ciField* field = s.get_field(will_link); | |
| 872 BasicType field_type = field->type()->basic_type(); | |
| 873 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
| 874 set_global_escape(state.apop()); | |
| 875 } else if (type2size[field_type] == 1) { | |
| 876 state.spop(); | |
| 877 } else { | |
| 878 state.lpop(); | |
| 879 } | |
| 880 if (s.cur_bc() != Bytecodes::_putstatic) { | |
| 881 ArgumentMap p = state.apop(); | |
| 882 set_method_escape(p); | |
|
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883 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
| 0 | 884 } |
| 885 } | |
| 886 break; | |
| 887 case Bytecodes::_invokevirtual: | |
| 888 case Bytecodes::_invokespecial: | |
| 889 case Bytecodes::_invokestatic: | |
|
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890 case Bytecodes::_invokedynamic: |
| 0 | 891 case Bytecodes::_invokeinterface: |
|
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892 { bool ignored_will_link; |
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893 ciSignature* declared_signature = NULL; |
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894 ciMethod* target = s.get_method(ignored_will_link, &declared_signature); |
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895 ciKlass* holder = s.get_declared_method_holder(); |
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896 assert(declared_signature != NULL, "cannot be null"); |
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897 // Push appendix argument, if one. |
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898 if (s.has_appendix()) { |
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899 state.apush(unknown_obj); |
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900 } |
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901 // Pass in raw bytecode because we need to see invokehandle instructions. |
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902 invoke(state, s.cur_bc_raw(), target, holder); |
|
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903 // We are using the return type of the declared signature here because |
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904 // it might be a more concrete type than the one from the target (for |
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905 // e.g. invokedynamic and invokehandle). |
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906 ciType* return_type = declared_signature->return_type(); |
| 0 | 907 if (!return_type->is_primitive_type()) { |
| 908 state.apush(unknown_obj); | |
| 909 } else if (return_type->is_one_word()) { | |
| 910 state.spush(); | |
| 911 } else if (return_type->is_two_word()) { | |
| 912 state.lpush(); | |
| 913 } | |
| 914 } | |
| 915 break; | |
| 916 case Bytecodes::_new: | |
| 917 state.apush(allocated_obj); | |
| 918 break; | |
| 919 case Bytecodes::_newarray: | |
| 920 case Bytecodes::_anewarray: | |
| 921 state.spop(); | |
| 922 state.apush(allocated_obj); | |
| 923 break; | |
| 924 case Bytecodes::_multianewarray: | |
| 925 { int i = s.cur_bcp()[3]; | |
| 926 while (i-- > 0) state.spop(); | |
| 927 state.apush(allocated_obj); | |
| 928 } | |
| 929 break; | |
| 930 case Bytecodes::_arraylength: | |
| 931 set_method_escape(state.apop()); | |
| 932 state.spush(); | |
| 933 break; | |
| 934 case Bytecodes::_athrow: | |
| 935 set_global_escape(state.apop()); | |
| 936 fall_through = false; | |
| 937 break; | |
| 938 case Bytecodes::_checkcast: | |
| 939 { ArgumentMap obj = state.apop(); | |
| 940 set_method_escape(obj); | |
| 941 state.apush(obj); | |
| 942 } | |
| 943 break; | |
| 944 case Bytecodes::_instanceof: | |
| 945 set_method_escape(state.apop()); | |
| 946 state.spush(); | |
| 947 break; | |
| 948 case Bytecodes::_monitorenter: | |
| 949 case Bytecodes::_monitorexit: | |
| 950 state.apop(); | |
| 951 break; | |
| 952 case Bytecodes::_wide: | |
| 953 ShouldNotReachHere(); | |
| 954 break; | |
| 955 case Bytecodes::_ifnull: | |
| 956 case Bytecodes::_ifnonnull: | |
| 957 { | |
| 958 set_method_escape(state.apop()); | |
| 959 int dest_bci = s.get_dest(); | |
| 960 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 961 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 962 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 963 break; | |
| 964 } | |
| 965 case Bytecodes::_goto_w: | |
| 966 { | |
| 967 int dest_bci = s.get_far_dest(); | |
| 968 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 969 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 970 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 971 fall_through = false; | |
| 972 break; | |
| 973 } | |
| 974 case Bytecodes::_jsr_w: | |
| 975 { | |
| 976 int dest_bci = s.get_far_dest(); | |
| 977 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
| 978 assert(s.next_bci() == limit_bci, "branch must end block"); | |
| 979 state.apush(empty_map); | |
| 980 successors.push(_methodBlocks->block_containing(dest_bci)); | |
| 981 fall_through = false; | |
| 982 break; | |
| 983 } | |
| 984 case Bytecodes::_breakpoint: | |
| 985 break; | |
| 986 default: | |
| 987 ShouldNotReachHere(); | |
| 988 break; | |
| 989 } | |
| 990 | |
| 991 } | |
| 992 if (fall_through) { | |
| 993 int fall_through_bci = s.cur_bci(); | |
| 994 if (fall_through_bci < _method->code_size()) { | |
| 995 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
| 996 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
| 997 } | |
| 998 } | |
| 999 } | |
| 1000 | |
| 1001 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
|
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1002 StateInfo *d_state = blockstates + dest->index(); |
| 0 | 1003 int nlocals = _method->max_locals(); |
| 1004 | |
| 1005 // exceptions may cause transfer of control to handlers in the middle of a | |
| 1006 // block, so we don't merge the incoming state of exception handlers | |
| 1007 if (dest->is_handler()) | |
| 1008 return; | |
| 1009 if (!d_state->_initialized ) { | |
| 1010 // destination not initialized, just copy | |
| 1011 for (int i = 0; i < nlocals; i++) { | |
| 1012 d_state->_vars[i] = s_state->_vars[i]; | |
| 1013 } | |
| 1014 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 1015 d_state->_stack[i] = s_state->_stack[i]; | |
| 1016 } | |
| 1017 d_state->_stack_height = s_state->_stack_height; | |
| 1018 d_state->_max_stack = s_state->_max_stack; | |
| 1019 d_state->_initialized = true; | |
| 1020 } else if (!dest->processed()) { | |
| 1021 // we have not yet walked the bytecodes of dest, we can merge | |
| 1022 // the states | |
| 1023 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 1024 for (int i = 0; i < nlocals; i++) { | |
| 1025 d_state->_vars[i].set_union(s_state->_vars[i]); | |
| 1026 } | |
| 1027 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 1028 d_state->_stack[i].set_union(s_state->_stack[i]); | |
| 1029 } | |
| 1030 } else { | |
| 1031 // the bytecodes of dest have already been processed, mark any | |
| 1032 // arguments in the source state which are not in the dest state | |
| 1033 // as global escape. | |
| 1034 // Future refinement: we only need to mark these variable to the | |
| 1035 // maximum escape of any variables in dest state | |
| 1036 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
| 1037 ArgumentMap extra_vars; | |
| 1038 for (int i = 0; i < nlocals; i++) { | |
| 1039 ArgumentMap t; | |
| 1040 t = s_state->_vars[i]; | |
| 1041 t.set_difference(d_state->_vars[i]); | |
| 1042 extra_vars.set_union(t); | |
| 1043 } | |
| 1044 for (int i = 0; i < s_state->_stack_height; i++) { | |
| 1045 ArgumentMap t; | |
|
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1046 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
| 0 | 1047 t.clear(); |
| 1048 t = s_state->_stack[i]; | |
| 1049 t.set_difference(d_state->_stack[i]); | |
| 1050 extra_vars.set_union(t); | |
| 1051 } | |
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1052 set_global_escape(extra_vars, true); |
| 0 | 1053 } |
| 1054 } | |
| 1055 | |
| 1056 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
| 1057 int numblocks = _methodBlocks->num_blocks(); | |
| 1058 int stkSize = _method->max_stack(); | |
| 1059 int numLocals = _method->max_locals(); | |
| 1060 StateInfo state; | |
| 1061 | |
| 1062 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
| 1063 int datasize = datacount * sizeof(ArgumentMap); | |
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1064 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
| 0 | 1065 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
| 1066 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
| 1067 ArgumentMap *dp = statedata; | |
| 1068 state._vars = dp; | |
| 1069 dp += numLocals; | |
| 1070 state._stack = dp; | |
| 1071 dp += stkSize; | |
| 1072 state._initialized = false; | |
| 1073 state._max_stack = stkSize; | |
| 1074 for (int i = 0; i < numblocks; i++) { | |
| 1075 blockstates[i]._vars = dp; | |
| 1076 dp += numLocals; | |
| 1077 blockstates[i]._stack = dp; | |
| 1078 dp += stkSize; | |
| 1079 blockstates[i]._initialized = false; | |
| 1080 blockstates[i]._stack_height = 0; | |
| 1081 blockstates[i]._max_stack = stkSize; | |
| 1082 } | |
| 1083 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
| 1084 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
| 1085 | |
| 1086 _methodBlocks->clear_processed(); | |
| 1087 | |
| 1088 // initialize block 0 state from method signature | |
| 1089 ArgumentMap allVars; // all oop arguments to method | |
| 1090 ciSignature* sig = method()->signature(); | |
| 1091 int j = 0; | |
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1092 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1093 int fb_i = first_blk->index(); |
| 0 | 1094 if (!method()->is_static()) { |
| 1095 // record information for "this" | |
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1096 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1097 allVars.add(j); |
| 1098 j++; | |
| 1099 } | |
| 1100 for (int i = 0; i < sig->count(); i++) { | |
| 1101 ciType* t = sig->type_at(i); | |
| 1102 if (!t->is_primitive_type()) { | |
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1103 blockstates[fb_i]._vars[j].set(j); |
| 0 | 1104 allVars.add(j); |
| 1105 } | |
| 1106 j += t->size(); | |
| 1107 } | |
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1108 blockstates[fb_i]._initialized = true; |
| 0 | 1109 assert(j == _arg_size, "just checking"); |
| 1110 | |
| 1111 ArgumentMap unknown_map; | |
| 1112 unknown_map.add_unknown(); | |
| 1113 | |
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1114 worklist.push(first_blk); |
| 0 | 1115 while(worklist.length() > 0) { |
| 1116 ciBlock *blk = worklist.pop(); | |
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1117 StateInfo *blkState = blockstates + blk->index(); |
| 0 | 1118 if (blk->is_handler() || blk->is_ret_target()) { |
| 1119 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1120 // that any variable could contain any argument |
| 0 | 1121 for (int i = 0; i < numLocals; i++) { |
| 1122 state._vars[i] = allVars; | |
| 1123 } | |
| 1124 if (blk->is_handler()) { | |
| 1125 state._stack_height = 1; | |
| 1126 } else { | |
| 1127 state._stack_height = blkState->_stack_height; | |
| 1128 } | |
| 1129 for (int i = 0; i < state._stack_height; i++) { | |
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1130 // ??? should this be unknown_map ??? |
| 0 | 1131 state._stack[i] = allVars; |
| 1132 } | |
| 1133 } else { | |
| 1134 for (int i = 0; i < numLocals; i++) { | |
| 1135 state._vars[i] = blkState->_vars[i]; | |
| 1136 } | |
| 1137 for (int i = 0; i < blkState->_stack_height; i++) { | |
| 1138 state._stack[i] = blkState->_stack[i]; | |
| 1139 } | |
| 1140 state._stack_height = blkState->_stack_height; | |
| 1141 } | |
| 1142 iterate_one_block(blk, state, successors); | |
| 1143 // if this block has any exception handlers, push them | |
| 1144 // onto successor list | |
| 1145 if (blk->has_handler()) { | |
| 1146 DEBUG_ONLY(int handler_count = 0;) | |
| 1147 int blk_start = blk->start_bci(); | |
| 1148 int blk_end = blk->limit_bci(); | |
| 1149 for (int i = 0; i < numblocks; i++) { | |
| 1150 ciBlock *b = _methodBlocks->block(i); | |
| 1151 if (b->is_handler()) { | |
| 1152 int ex_start = b->ex_start_bci(); | |
| 1153 int ex_end = b->ex_limit_bci(); | |
| 1154 if ((ex_start >= blk_start && ex_start < blk_end) || | |
| 1155 (ex_end > blk_start && ex_end <= blk_end)) { | |
| 1156 successors.push(b); | |
| 1157 } | |
| 1158 DEBUG_ONLY(handler_count++;) | |
| 1159 } | |
| 1160 } | |
| 1161 assert(handler_count > 0, "must find at least one handler"); | |
| 1162 } | |
| 1163 // merge computed variable state with successors | |
| 1164 while(successors.length() > 0) { | |
| 1165 ciBlock *succ = successors.pop(); | |
| 1166 merge_block_states(blockstates, succ, &state); | |
| 1167 if (!succ->processed()) | |
| 1168 worklist.push(succ); | |
| 1169 } | |
| 1170 } | |
| 1171 } | |
| 1172 | |
| 1173 bool BCEscapeAnalyzer::do_analysis() { | |
| 1174 Arena* arena = CURRENT_ENV->arena(); | |
| 1175 // identify basic blocks | |
| 1176 _methodBlocks = _method->get_method_blocks(); | |
| 1177 | |
| 1178 iterate_blocks(arena); | |
| 1179 // TEMPORARY | |
| 1180 return true; | |
| 1181 } | |
| 1182 | |
| 1183 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
| 1184 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
| 1185 | |
| 1186 if (iid == vmIntrinsics::_getClass || | |
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1187 iid == vmIntrinsics::_fillInStackTrace || |
| 0 | 1188 iid == vmIntrinsics::_hashCode) |
| 1189 return iid; | |
| 1190 else | |
| 1191 return vmIntrinsics::_none; | |
| 1192 } | |
| 1193 | |
| 1194 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1195 ArgumentMap arg; |
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1196 arg.clear(); |
| 0 | 1197 switch (iid) { |
| 1198 case vmIntrinsics::_getClass: | |
| 1199 _return_local = false; | |
| 1200 break; | |
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1201 case vmIntrinsics::_fillInStackTrace: |
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1202 arg.set(0); // 'this' |
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1203 set_returned(arg); |
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1204 break; |
| 0 | 1205 case vmIntrinsics::_hashCode: |
| 1206 // initialized state is correct | |
| 1207 break; | |
| 1208 default: | |
| 1209 assert(false, "unexpected intrinsic"); | |
| 1210 } | |
| 1211 return true; | |
| 1212 } | |
| 1213 | |
| 1214 void BCEscapeAnalyzer::initialize() { | |
| 1215 int i; | |
| 1216 | |
| 1217 // clear escape information (method may have been deoptimized) | |
| 1218 methodData()->clear_escape_info(); | |
| 1219 | |
| 1220 // initialize escape state of object parameters | |
| 1221 ciSignature* sig = method()->signature(); | |
| 1222 int j = 0; | |
| 1223 if (!method()->is_static()) { | |
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1224 _arg_local.set(0); |
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1225 _arg_stack.set(0); |
| 0 | 1226 j++; |
| 1227 } | |
| 1228 for (i = 0; i < sig->count(); i++) { | |
| 1229 ciType* t = sig->type_at(i); | |
| 1230 if (!t->is_primitive_type()) { | |
|
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1231 _arg_local.set(j); |
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1232 _arg_stack.set(j); |
| 0 | 1233 } |
| 1234 j += t->size(); | |
| 1235 } | |
| 1236 assert(j == _arg_size, "just checking"); | |
| 1237 | |
| 1238 // start with optimistic assumption | |
| 1239 ciType *rt = _method->return_type(); | |
| 1240 if (rt->is_primitive_type()) { | |
| 1241 _return_local = false; | |
| 1242 _return_allocated = false; | |
| 1243 } else { | |
| 1244 _return_local = true; | |
| 1245 _return_allocated = true; | |
| 1246 } | |
| 1247 _allocated_escapes = false; | |
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1248 _unknown_modified = false; |
| 0 | 1249 } |
| 1250 | |
| 1251 void BCEscapeAnalyzer::clear_escape_info() { | |
| 1252 ciSignature* sig = method()->signature(); | |
| 1253 int arg_count = sig->count(); | |
| 1254 ArgumentMap var; | |
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1255 if (!method()->is_static()) { |
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1256 arg_count++; // allow for "this" |
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1257 } |
| 0 | 1258 for (int i = 0; i < arg_count; i++) { |
|
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1259 set_arg_modified(i, OFFSET_ANY, 4); |
| 0 | 1260 var.clear(); |
| 1261 var.set(i); | |
|
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1262 set_modified(var, OFFSET_ANY, 4); |
| 0 | 1263 set_global_escape(var); |
| 1264 } | |
|
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1265 _arg_local.Clear(); |
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1266 _arg_stack.Clear(); |
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1267 _arg_returned.Clear(); |
| 0 | 1268 _return_local = false; |
| 1269 _return_allocated = false; | |
| 1270 _allocated_escapes = true; | |
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1271 _unknown_modified = true; |
| 0 | 1272 } |
| 1273 | |
| 1274 | |
| 1275 void BCEscapeAnalyzer::compute_escape_info() { | |
| 1276 int i; | |
| 1277 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
| 1278 | |
| 1279 vmIntrinsics::ID iid = known_intrinsic(); | |
| 1280 | |
| 1281 // check if method can be analyzed | |
| 1282 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
| 1283 || _level > MaxBCEAEstimateLevel | |
| 1284 || method()->code_size() > MaxBCEAEstimateSize)) { | |
| 1285 if (BCEATraceLevel >= 1) { | |
| 1286 tty->print("Skipping method because: "); | |
| 1287 if (method()->is_abstract()) | |
| 1288 tty->print_cr("method is abstract."); | |
| 1289 else if (method()->is_native()) | |
| 1290 tty->print_cr("method is native."); | |
| 1291 else if (!method()->holder()->is_initialized()) | |
| 1292 tty->print_cr("class of method is not initialized."); | |
| 1293 else if (_level > MaxBCEAEstimateLevel) | |
| 1294 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
|
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1295 _level, (int) MaxBCEAEstimateLevel); |
| 0 | 1296 else if (method()->code_size() > MaxBCEAEstimateSize) |
|
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1297 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize (%d).", |
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1298 method()->code_size(), (int) MaxBCEAEstimateSize); |
| 0 | 1299 else |
| 1300 ShouldNotReachHere(); | |
| 1301 } | |
| 1302 clear_escape_info(); | |
| 1303 | |
| 1304 return; | |
| 1305 } | |
| 1306 | |
| 1307 if (BCEATraceLevel >= 1) { | |
| 1308 tty->print("[EA] estimating escape information for"); | |
| 1309 if (iid != vmIntrinsics::_none) | |
| 1310 tty->print(" intrinsic"); | |
| 1311 method()->print_short_name(); | |
| 1312 tty->print_cr(" (%d bytes)", method()->code_size()); | |
| 1313 } | |
| 1314 | |
| 1315 bool success; | |
| 1316 | |
| 1317 initialize(); | |
| 1318 | |
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1319 // Do not scan method if it has no object parameters and |
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1320 // does not returns an object (_return_allocated is set in initialize()). |
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1321 if (_arg_local.Size() == 0 && !_return_allocated) { |
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1322 // Clear all info since method's bytecode was not analysed and |
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1323 // set pessimistic escape information. |
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1324 clear_escape_info(); |
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1325 methodData()->set_eflag(MethodData::allocated_escapes); |
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1326 methodData()->set_eflag(MethodData::unknown_modified); |
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1327 methodData()->set_eflag(MethodData::estimated); |
| 0 | 1328 return; |
| 1329 } | |
| 1330 | |
| 1331 if (iid != vmIntrinsics::_none) | |
| 1332 success = compute_escape_for_intrinsic(iid); | |
| 1333 else { | |
| 1334 success = do_analysis(); | |
| 1335 } | |
| 1336 | |
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1337 // don't store interprocedural escape information if it introduces |
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1338 // dependencies or if method data is empty |
| 0 | 1339 // |
| 1340 if (!has_dependencies() && !methodData()->is_empty()) { | |
| 1341 for (i = 0; i < _arg_size; i++) { | |
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1342 if (_arg_local.test(i)) { |
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1343 assert(_arg_stack.test(i), "inconsistent escape info"); |
| 0 | 1344 methodData()->set_arg_local(i); |
| 1345 methodData()->set_arg_stack(i); | |
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1346 } else if (_arg_stack.test(i)) { |
| 0 | 1347 methodData()->set_arg_stack(i); |
| 1348 } | |
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1349 if (_arg_returned.test(i)) { |
| 0 | 1350 methodData()->set_arg_returned(i); |
| 1351 } | |
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1352 methodData()->set_arg_modified(i, _arg_modified[i]); |
| 0 | 1353 } |
| 1354 if (_return_local) { | |
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1355 methodData()->set_eflag(MethodData::return_local); |
| 0 | 1356 } |
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1357 if (_return_allocated) { |
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1358 methodData()->set_eflag(MethodData::return_allocated); |
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1359 } |
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1360 if (_allocated_escapes) { |
|
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1361 methodData()->set_eflag(MethodData::allocated_escapes); |
|
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1362 } |
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1363 if (_unknown_modified) { |
|
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1364 methodData()->set_eflag(MethodData::unknown_modified); |
|
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1365 } |
|
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1366 methodData()->set_eflag(MethodData::estimated); |
| 0 | 1367 } |
| 1368 } | |
| 1369 | |
| 1370 void BCEscapeAnalyzer::read_escape_info() { | |
| 1371 assert(methodData()->has_escape_info(), "no escape info available"); | |
| 1372 | |
| 1373 // read escape information from method descriptor | |
| 1374 for (int i = 0; i < _arg_size; i++) { | |
|
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1375 if (methodData()->is_arg_local(i)) |
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1376 _arg_local.set(i); |
|
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1377 if (methodData()->is_arg_stack(i)) |
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1378 _arg_stack.set(i); |
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1379 if (methodData()->is_arg_returned(i)) |
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1380 _arg_returned.set(i); |
|
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1381 _arg_modified[i] = methodData()->arg_modified(i); |
| 0 | 1382 } |
|
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1383 _return_local = methodData()->eflag_set(MethodData::return_local); |
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1384 _return_allocated = methodData()->eflag_set(MethodData::return_allocated); |
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1385 _allocated_escapes = methodData()->eflag_set(MethodData::allocated_escapes); |
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1386 _unknown_modified = methodData()->eflag_set(MethodData::unknown_modified); |
| 0 | 1387 |
| 1388 } | |
| 1389 | |
|
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1390 #ifndef PRODUCT |
|
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1391 void BCEscapeAnalyzer::dump() { |
|
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1392 tty->print("[EA] estimated escape information for"); |
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1393 method()->print_short_name(); |
|
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1394 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
|
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1395 tty->print(" non-escaping args: "); |
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1396 _arg_local.print_on(tty); |
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1397 tty->print(" stack-allocatable args: "); |
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1398 _arg_stack.print_on(tty); |
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1399 if (_return_local) { |
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1400 tty->print(" returned args: "); |
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1401 _arg_returned.print_on(tty); |
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1402 } else if (is_return_allocated()) { |
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1403 tty->print_cr(" return allocated value"); |
|
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1404 } else { |
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1405 tty->print_cr(" return non-local value"); |
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1406 } |
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1407 tty->print(" modified args: "); |
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1408 for (int i = 0; i < _arg_size; i++) { |
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1409 if (_arg_modified[i] == 0) |
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1410 tty->print(" 0"); |
|
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1411 else |
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1412 tty->print(" 0x%x", _arg_modified[i]); |
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1413 } |
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1414 tty->cr(); |
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1415 tty->print(" flags: "); |
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1416 if (_return_allocated) |
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1417 tty->print(" return_allocated"); |
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1418 if (_allocated_escapes) |
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1419 tty->print(" allocated_escapes"); |
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1420 if (_unknown_modified) |
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1421 tty->print(" unknown_modified"); |
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1422 tty->cr(); |
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1423 } |
|
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1424 #endif |
| 0 | 1425 |
| 1426 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
| 1427 : _conservative(method == NULL || !EstimateArgEscape) | |
|
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1428 , _arena(CURRENT_ENV->arena()) |
| 0 | 1429 , _method(method) |
| 1430 , _methodData(method ? method->method_data() : NULL) | |
| 1431 , _arg_size(method ? method->arg_size() : 0) | |
|
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1432 , _arg_local(_arena) |
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1433 , _arg_stack(_arena) |
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1434 , _arg_returned(_arena) |
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1435 , _dirty(_arena) |
| 0 | 1436 , _return_local(false) |
| 1437 , _return_allocated(false) | |
| 1438 , _allocated_escapes(false) | |
|
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1439 , _unknown_modified(false) |
|
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1440 , _dependencies(_arena, 4, 0, NULL) |
| 0 | 1441 , _parent(parent) |
| 1442 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
| 1443 if (!_conservative) { | |
|
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1444 _arg_local.Clear(); |
|
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1445 _arg_stack.Clear(); |
|
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|
1446 _arg_returned.Clear(); |
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1447 _dirty.Clear(); |
| 0 | 1448 Arena* arena = CURRENT_ENV->arena(); |
|
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1449 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1450 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
| 0 | 1451 |
| 1452 if (methodData() == NULL) | |
| 1453 return; | |
| 1454 bool printit = _method->should_print_assembly(); | |
| 1455 if (methodData()->has_escape_info()) { | |
| 1456 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
| 1457 method->holder()->name()->as_utf8(), | |
| 1458 method->name()->as_utf8())); | |
| 1459 read_escape_info(); | |
| 1460 } else { | |
| 1461 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
| 1462 method->holder()->name()->as_utf8(), | |
| 1463 method->name()->as_utf8())); | |
| 1464 | |
| 1465 compute_escape_info(); | |
| 1466 methodData()->update_escape_info(); | |
| 1467 } | |
|
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1468 #ifndef PRODUCT |
|
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1469 if (BCEATraceLevel >= 3) { |
|
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1470 // dump escape information |
|
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1471 dump(); |
|
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1472 } |
|
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1473 #endif |
| 0 | 1474 } |
| 1475 } | |
| 1476 | |
| 1477 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
|
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1478 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
|
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1479 // Also record evol dependencies so redefinition of the |
|
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1480 // callee will trigger recompilation. |
|
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|
1481 deps->assert_evol_method(method()); |
|
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1482 } |
| 0 | 1483 for (int i = 0; i < _dependencies.length(); i+=2) { |
|
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1484 ciKlass *k = _dependencies.at(i)->as_klass(); |
|
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1485 ciMethod *m = _dependencies.at(i+1)->as_method(); |
| 0 | 1486 deps->assert_unique_concrete_method(k, m); |
| 1487 } | |
| 1488 } |