Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 14206:e7b58922266b
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Reviewed-by: kvn, sspitsyn
author | mgronlun |
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date | Thu, 05 Dec 2013 12:35:38 +0100 |
parents | c90c698831d7 |
children | de6a9e811145 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, 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 } |
154
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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) | |
1648
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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(); |
45
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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 } | |
78
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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) { | |
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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 } |