Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 2834:bfce42cd9c07
Graph duplication now passes all tests
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 31 May 2011 13:34:52 +0200 |
parents | a7367756024b |
children | 548597e74aa4 |
rev | line source |
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0 | 1 /* |
2142 | 2 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/bcEscapeAnalyzer.hpp" | |
27 #include "ci/ciConstant.hpp" | |
28 #include "ci/ciField.hpp" | |
29 #include "ci/ciMethodBlocks.hpp" | |
30 #include "ci/ciStreams.hpp" | |
31 #include "interpreter/bytecode.hpp" | |
32 #include "utilities/bitMap.inline.hpp" | |
0 | 33 |
34 | |
35 | |
36 #ifndef PRODUCT | |
37 #define TRACE_BCEA(level, code) \ | |
38 if (EstimateArgEscape && BCEATraceLevel >= level) { \ | |
39 code; \ | |
40 } | |
41 #else | |
42 #define TRACE_BCEA(level, code) | |
43 #endif | |
44 | |
45 // Maintain a map of which aguments a local variable or | |
46 // stack slot may contain. In addition to tracking | |
47 // arguments, it tracks two special values, "allocated" | |
48 // which represents any object allocated in the current | |
49 // method, and "unknown" which is any other object. | |
50 // Up to 30 arguments are handled, with the last one | |
51 // representing summary information for any extra arguments | |
52 class BCEscapeAnalyzer::ArgumentMap { | |
53 uint _bits; | |
54 enum {MAXBIT = 29, | |
55 ALLOCATED = 1, | |
56 UNKNOWN = 2}; | |
57 | |
58 uint int_to_bit(uint e) const { | |
59 if (e > MAXBIT) | |
60 e = MAXBIT; | |
61 return (1 << (e + 2)); | |
62 } | |
63 | |
64 public: | |
65 ArgumentMap() { _bits = 0;} | |
66 void set_bits(uint bits) { _bits = bits;} | |
67 uint get_bits() const { return _bits;} | |
68 void clear() { _bits = 0;} | |
69 void set_all() { _bits = ~0u; } | |
70 bool is_empty() const { return _bits == 0; } | |
71 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } | |
72 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } | |
73 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } | |
74 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } | |
75 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } | |
76 void set(uint var) { _bits = int_to_bit(var); } | |
77 void add(uint var) { _bits |= int_to_bit(var); } | |
78 void add_unknown() { _bits = UNKNOWN; } | |
79 void add_allocated() { _bits = ALLOCATED; } | |
80 void set_union(const ArgumentMap &am) { _bits |= am._bits; } | |
81 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } | |
82 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } | |
83 void operator=(const ArgumentMap &am) { _bits = am._bits; } | |
84 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } | |
85 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } | |
86 }; | |
87 | |
88 class BCEscapeAnalyzer::StateInfo { | |
89 public: | |
90 ArgumentMap *_vars; | |
91 ArgumentMap *_stack; | |
92 short _stack_height; | |
93 short _max_stack; | |
94 bool _initialized; | |
95 ArgumentMap empty_map; | |
96 | |
97 StateInfo() { | |
98 empty_map.clear(); | |
99 } | |
100 | |
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101 ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } |
0 | 102 ArgumentMap apop() { return raw_pop(); } |
103 void spop() { raw_pop(); } | |
104 void lpop() { spop(); spop(); } | |
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105 void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } |
0 | 106 void apush(ArgumentMap i) { raw_push(i); } |
107 void spush() { raw_push(empty_map); } | |
108 void lpush() { spush(); spush(); } | |
109 | |
110 }; | |
111 | |
112 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { | |
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113 for (int i = 0; i < _arg_size; i++) { |
0 | 114 if (vars.contains(i)) |
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115 _arg_returned.set(i); |
0 | 116 } |
117 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); | |
118 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); | |
119 } | |
120 | |
121 // return true if any element of vars is an argument | |
122 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { | |
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123 for (int i = 0; i < _arg_size; i++) { |
0 | 124 if (vars.contains(i)) |
125 return true; | |
126 } | |
127 return false; | |
128 } | |
129 | |
130 // return true if any element of vars is an arg_stack argument | |
131 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ | |
132 if (_conservative) | |
133 return true; | |
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134 for (int i = 0; i < _arg_size; i++) { |
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135 if (vars.contains(i) && _arg_stack.test(i)) |
0 | 136 return true; |
137 } | |
138 return false; | |
139 } | |
140 | |
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141 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { |
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142 for (int i = 0; i < _arg_size; i++) { |
0 | 143 if (vars.contains(i)) { |
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144 bm >>= i; |
0 | 145 } |
146 } | |
147 } | |
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148 |
0 | 149 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { |
150 clear_bits(vars, _arg_local); | |
151 } | |
152 | |
153 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars) { | |
154 clear_bits(vars, _arg_local); | |
155 clear_bits(vars, _arg_stack); | |
156 if (vars.contains_allocated()) | |
157 _allocated_escapes = true; | |
158 } | |
159 | |
160 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
161 clear_bits(vars, _dirty); | |
162 } | |
163 | |
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164 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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165 |
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166 for (int i = 0; i < _arg_size; i++) { |
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167 if (vars.contains(i)) { |
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168 set_arg_modified(i, offs, size); |
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169 } |
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170 } |
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171 if (vars.contains_unknown()) |
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172 _unknown_modified = true; |
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173 } |
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174 |
0 | 175 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
176 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
177 if (scope->method() == callee) { | |
178 return true; | |
179 } | |
180 } | |
181 return false; | |
182 } | |
183 | |
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184 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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185 if (offset == OFFSET_ANY) |
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186 return _arg_modified[arg] != 0; |
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187 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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188 bool modified = false; |
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189 int l = offset / HeapWordSize; |
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190 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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191 if (l > ARG_OFFSET_MAX) |
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192 l = ARG_OFFSET_MAX; |
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193 if (h > ARG_OFFSET_MAX+1) |
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194 h = ARG_OFFSET_MAX + 1; |
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195 for (int i = l; i < h; i++) { |
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196 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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197 } |
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198 return modified; |
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199 } |
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200 |
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201 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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202 if (offset == OFFSET_ANY) { |
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203 _arg_modified[arg] = (uint) -1; |
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204 return; |
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205 } |
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206 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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207 int l = offset / HeapWordSize; |
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208 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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209 if (l > ARG_OFFSET_MAX) |
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210 l = ARG_OFFSET_MAX; |
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211 if (h > ARG_OFFSET_MAX+1) |
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212 h = ARG_OFFSET_MAX + 1; |
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213 for (int i = l; i < h; i++) { |
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214 _arg_modified[arg] |= (1 << i); |
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215 } |
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216 } |
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217 |
0 | 218 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
219 int i; | |
220 | |
221 // retrieve information about the callee | |
222 ciInstanceKlass* klass = target->holder(); | |
223 ciInstanceKlass* calling_klass = method()->holder(); | |
224 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
225 ciInstanceKlass* actual_recv = callee_holder; | |
226 | |
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227 // some methods are obviously bindable without any type checks so |
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228 // convert them directly to an invokespecial. |
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229 if (target->is_loaded() && !target->is_abstract() && |
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230 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) { |
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231 code = Bytecodes::_invokespecial; |
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232 } |
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233 |
0 | 234 // compute size of arguments |
235 int arg_size = target->arg_size(); | |
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236 if (code == Bytecodes::_invokedynamic) { |
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237 assert(!target->is_static(), "receiver explicit in method"); |
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238 arg_size--; // implicit, not really on stack |
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239 } |
0 | 240 if (!target->is_loaded() && code == Bytecodes::_invokestatic) { |
241 arg_size--; | |
242 } | |
243 int arg_base = MAX2(state._stack_height - arg_size, 0); | |
244 | |
245 // direct recursive calls are skipped if they can be bound statically without introducing | |
246 // dependencies and if parameters are passed at the same position as in the current method | |
247 // other calls are skipped if there are no unescaped arguments passed to them | |
248 bool directly_recursive = (method() == target) && | |
249 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
250 | |
251 // check if analysis of callee can safely be skipped | |
252 bool skip_callee = true; | |
253 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
254 ArgumentMap arg = state._stack[i]; | |
255 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
256 } | |
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257 // For now we conservatively skip invokedynamic. |
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258 if (code == Bytecodes::_invokedynamic) { |
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259 skip_callee = true; |
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260 } |
0 | 261 if (skip_callee) { |
262 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
263 for (i = 0; i < arg_size; i++) { | |
264 set_method_escape(state.raw_pop()); | |
265 } | |
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266 _unknown_modified = true; // assume the worst since we don't analyze the called method |
0 | 267 return; |
268 } | |
269 | |
270 // determine actual method (use CHA if necessary) | |
271 ciMethod* inline_target = NULL; | |
272 if (target->is_loaded() && klass->is_loaded() | |
273 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
274 && target->will_link(klass, callee_holder, code)) { | |
275 if (code == Bytecodes::_invokestatic | |
276 || code == Bytecodes::_invokespecial | |
277 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
278 inline_target = target; | |
279 } else { | |
280 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
281 } | |
282 } | |
283 | |
284 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
285 // analyze callee | |
286 BCEscapeAnalyzer analyzer(inline_target, this); | |
287 | |
288 // adjust escape state of actual parameters | |
289 bool must_record_dependencies = false; | |
290 for (i = arg_size - 1; i >= 0; i--) { | |
291 ArgumentMap arg = state.raw_pop(); | |
292 if (!is_argument(arg)) | |
293 continue; | |
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294 for (int j = 0; j < _arg_size; j++) { |
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295 if (arg.contains(j)) { |
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296 _arg_modified[j] |= analyzer._arg_modified[i]; |
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297 } |
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298 } |
0 | 299 if (!is_arg_stack(arg)) { |
300 // arguments have already been recognized as escaping | |
301 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
302 set_method_escape(arg); | |
303 must_record_dependencies = true; | |
304 } else { | |
305 set_global_escape(arg); | |
306 } | |
307 } | |
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308 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
0 | 309 |
310 // record dependencies if at least one parameter retained stack-allocatable | |
311 if (must_record_dependencies) { | |
312 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
313 _dependencies.append(actual_recv); | |
314 _dependencies.append(inline_target); | |
315 } | |
316 _dependencies.appendAll(analyzer.dependencies()); | |
317 } | |
318 } else { | |
319 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
320 target->name()->as_utf8())); | |
321 // conservatively mark all actual parameters as escaping globally | |
322 for (i = 0; i < arg_size; i++) { | |
323 ArgumentMap arg = state.raw_pop(); | |
324 if (!is_argument(arg)) | |
325 continue; | |
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326 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 327 set_global_escape(arg); |
328 } | |
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329 _unknown_modified = true; // assume the worst since we don't know the called method |
0 | 330 } |
331 } | |
332 | |
333 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
334 return ((~arg_set1) | arg_set2) == 0; | |
335 } | |
336 | |
337 | |
338 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
339 | |
340 blk->set_processed(); | |
341 ciBytecodeStream s(method()); | |
342 int limit_bci = blk->limit_bci(); | |
343 bool fall_through = false; | |
344 ArgumentMap allocated_obj; | |
345 allocated_obj.add_allocated(); | |
346 ArgumentMap unknown_obj; | |
347 unknown_obj.add_unknown(); | |
348 ArgumentMap empty_map; | |
349 | |
350 s.reset_to_bci(blk->start_bci()); | |
351 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
352 fall_through = true; | |
353 switch (s.cur_bc()) { | |
354 case Bytecodes::_nop: | |
355 break; | |
356 case Bytecodes::_aconst_null: | |
357 state.apush(empty_map); | |
358 break; | |
359 case Bytecodes::_iconst_m1: | |
360 case Bytecodes::_iconst_0: | |
361 case Bytecodes::_iconst_1: | |
362 case Bytecodes::_iconst_2: | |
363 case Bytecodes::_iconst_3: | |
364 case Bytecodes::_iconst_4: | |
365 case Bytecodes::_iconst_5: | |
366 case Bytecodes::_fconst_0: | |
367 case Bytecodes::_fconst_1: | |
368 case Bytecodes::_fconst_2: | |
369 case Bytecodes::_bipush: | |
370 case Bytecodes::_sipush: | |
371 state.spush(); | |
372 break; | |
373 case Bytecodes::_lconst_0: | |
374 case Bytecodes::_lconst_1: | |
375 case Bytecodes::_dconst_0: | |
376 case Bytecodes::_dconst_1: | |
377 state.lpush(); | |
378 break; | |
379 case Bytecodes::_ldc: | |
380 case Bytecodes::_ldc_w: | |
381 case Bytecodes::_ldc2_w: | |
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382 { |
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383 // Avoid calling get_constant() which will try to allocate |
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384 // unloaded constant. We need only constant's type. |
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385 int index = s.get_constant_pool_index(); |
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386 constantTag tag = s.get_constant_pool_tag(index); |
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387 if (tag.is_long() || tag.is_double()) { |
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388 // Only longs and doubles use 2 stack slots. |
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389 state.lpush(); |
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390 } else { |
0 | 391 state.spush(); |
392 } | |
393 break; | |
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394 } |
0 | 395 case Bytecodes::_aload: |
396 state.apush(state._vars[s.get_index()]); | |
397 break; | |
398 case Bytecodes::_iload: | |
399 case Bytecodes::_fload: | |
400 case Bytecodes::_iload_0: | |
401 case Bytecodes::_iload_1: | |
402 case Bytecodes::_iload_2: | |
403 case Bytecodes::_iload_3: | |
404 case Bytecodes::_fload_0: | |
405 case Bytecodes::_fload_1: | |
406 case Bytecodes::_fload_2: | |
407 case Bytecodes::_fload_3: | |
408 state.spush(); | |
409 break; | |
410 case Bytecodes::_lload: | |
411 case Bytecodes::_dload: | |
412 case Bytecodes::_lload_0: | |
413 case Bytecodes::_lload_1: | |
414 case Bytecodes::_lload_2: | |
415 case Bytecodes::_lload_3: | |
416 case Bytecodes::_dload_0: | |
417 case Bytecodes::_dload_1: | |
418 case Bytecodes::_dload_2: | |
419 case Bytecodes::_dload_3: | |
420 state.lpush(); | |
421 break; | |
422 case Bytecodes::_aload_0: | |
423 state.apush(state._vars[0]); | |
424 break; | |
425 case Bytecodes::_aload_1: | |
426 state.apush(state._vars[1]); | |
427 break; | |
428 case Bytecodes::_aload_2: | |
429 state.apush(state._vars[2]); | |
430 break; | |
431 case Bytecodes::_aload_3: | |
432 state.apush(state._vars[3]); | |
433 break; | |
434 case Bytecodes::_iaload: | |
435 case Bytecodes::_faload: | |
436 case Bytecodes::_baload: | |
437 case Bytecodes::_caload: | |
438 case Bytecodes::_saload: | |
439 state.spop(); | |
440 set_method_escape(state.apop()); | |
441 state.spush(); | |
442 break; | |
443 case Bytecodes::_laload: | |
444 case Bytecodes::_daload: | |
445 state.spop(); | |
446 set_method_escape(state.apop()); | |
447 state.lpush(); | |
448 break; | |
449 case Bytecodes::_aaload: | |
450 { state.spop(); | |
451 ArgumentMap array = state.apop(); | |
452 set_method_escape(array); | |
453 state.apush(unknown_obj); | |
454 set_dirty(array); | |
455 } | |
456 break; | |
457 case Bytecodes::_istore: | |
458 case Bytecodes::_fstore: | |
459 case Bytecodes::_istore_0: | |
460 case Bytecodes::_istore_1: | |
461 case Bytecodes::_istore_2: | |
462 case Bytecodes::_istore_3: | |
463 case Bytecodes::_fstore_0: | |
464 case Bytecodes::_fstore_1: | |
465 case Bytecodes::_fstore_2: | |
466 case Bytecodes::_fstore_3: | |
467 state.spop(); | |
468 break; | |
469 case Bytecodes::_lstore: | |
470 case Bytecodes::_dstore: | |
471 case Bytecodes::_lstore_0: | |
472 case Bytecodes::_lstore_1: | |
473 case Bytecodes::_lstore_2: | |
474 case Bytecodes::_lstore_3: | |
475 case Bytecodes::_dstore_0: | |
476 case Bytecodes::_dstore_1: | |
477 case Bytecodes::_dstore_2: | |
478 case Bytecodes::_dstore_3: | |
479 state.lpop(); | |
480 break; | |
481 case Bytecodes::_astore: | |
482 state._vars[s.get_index()] = state.apop(); | |
483 break; | |
484 case Bytecodes::_astore_0: | |
485 state._vars[0] = state.apop(); | |
486 break; | |
487 case Bytecodes::_astore_1: | |
488 state._vars[1] = state.apop(); | |
489 break; | |
490 case Bytecodes::_astore_2: | |
491 state._vars[2] = state.apop(); | |
492 break; | |
493 case Bytecodes::_astore_3: | |
494 state._vars[3] = state.apop(); | |
495 break; | |
496 case Bytecodes::_iastore: | |
497 case Bytecodes::_fastore: | |
498 case Bytecodes::_bastore: | |
499 case Bytecodes::_castore: | |
500 case Bytecodes::_sastore: | |
501 { | |
502 state.spop(); | |
503 state.spop(); | |
504 ArgumentMap arr = state.apop(); | |
505 set_method_escape(arr); | |
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506 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 507 break; |
508 } | |
509 case Bytecodes::_lastore: | |
510 case Bytecodes::_dastore: | |
511 { | |
512 state.lpop(); | |
513 state.spop(); | |
514 ArgumentMap arr = state.apop(); | |
515 set_method_escape(arr); | |
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516 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
0 | 517 break; |
518 } | |
519 case Bytecodes::_aastore: | |
520 { | |
521 set_global_escape(state.apop()); | |
522 state.spop(); | |
523 ArgumentMap arr = state.apop(); | |
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524 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
0 | 525 break; |
526 } | |
527 case Bytecodes::_pop: | |
528 state.raw_pop(); | |
529 break; | |
530 case Bytecodes::_pop2: | |
531 state.raw_pop(); | |
532 state.raw_pop(); | |
533 break; | |
534 case Bytecodes::_dup: | |
535 { ArgumentMap w1 = state.raw_pop(); | |
536 state.raw_push(w1); | |
537 state.raw_push(w1); | |
538 } | |
539 break; | |
540 case Bytecodes::_dup_x1: | |
541 { ArgumentMap w1 = state.raw_pop(); | |
542 ArgumentMap w2 = state.raw_pop(); | |
543 state.raw_push(w1); | |
544 state.raw_push(w2); | |
545 state.raw_push(w1); | |
546 } | |
547 break; | |
548 case Bytecodes::_dup_x2: | |
549 { ArgumentMap w1 = state.raw_pop(); | |
550 ArgumentMap w2 = state.raw_pop(); | |
551 ArgumentMap w3 = state.raw_pop(); | |
552 state.raw_push(w1); | |
553 state.raw_push(w3); | |
554 state.raw_push(w2); | |
555 state.raw_push(w1); | |
556 } | |
557 break; | |
558 case Bytecodes::_dup2: | |
559 { ArgumentMap w1 = state.raw_pop(); | |
560 ArgumentMap w2 = state.raw_pop(); | |
561 state.raw_push(w2); | |
562 state.raw_push(w1); | |
563 state.raw_push(w2); | |
564 state.raw_push(w1); | |
565 } | |
566 break; | |
567 case Bytecodes::_dup2_x1: | |
568 { ArgumentMap w1 = state.raw_pop(); | |
569 ArgumentMap w2 = state.raw_pop(); | |
570 ArgumentMap w3 = state.raw_pop(); | |
571 state.raw_push(w2); | |
572 state.raw_push(w1); | |
573 state.raw_push(w3); | |
574 state.raw_push(w2); | |
575 state.raw_push(w1); | |
576 } | |
577 break; | |
578 case Bytecodes::_dup2_x2: | |
579 { ArgumentMap w1 = state.raw_pop(); | |
580 ArgumentMap w2 = state.raw_pop(); | |
581 ArgumentMap w3 = state.raw_pop(); | |
582 ArgumentMap w4 = state.raw_pop(); | |
583 state.raw_push(w2); | |
584 state.raw_push(w1); | |
585 state.raw_push(w4); | |
586 state.raw_push(w3); | |
587 state.raw_push(w2); | |
588 state.raw_push(w1); | |
589 } | |
590 break; | |
591 case Bytecodes::_swap: | |
592 { ArgumentMap w1 = state.raw_pop(); | |
593 ArgumentMap w2 = state.raw_pop(); | |
594 state.raw_push(w1); | |
595 state.raw_push(w2); | |
596 } | |
597 break; | |
598 case Bytecodes::_iadd: | |
599 case Bytecodes::_fadd: | |
600 case Bytecodes::_isub: | |
601 case Bytecodes::_fsub: | |
602 case Bytecodes::_imul: | |
603 case Bytecodes::_fmul: | |
604 case Bytecodes::_idiv: | |
605 case Bytecodes::_fdiv: | |
606 case Bytecodes::_irem: | |
607 case Bytecodes::_frem: | |
608 case Bytecodes::_iand: | |
609 case Bytecodes::_ior: | |
610 case Bytecodes::_ixor: | |
611 state.spop(); | |
612 state.spop(); | |
613 state.spush(); | |
614 break; | |
615 case Bytecodes::_ladd: | |
616 case Bytecodes::_dadd: | |
617 case Bytecodes::_lsub: | |
618 case Bytecodes::_dsub: | |
619 case Bytecodes::_lmul: | |
620 case Bytecodes::_dmul: | |
621 case Bytecodes::_ldiv: | |
622 case Bytecodes::_ddiv: | |
623 case Bytecodes::_lrem: | |
624 case Bytecodes::_drem: | |
625 case Bytecodes::_land: | |
626 case Bytecodes::_lor: | |
627 case Bytecodes::_lxor: | |
628 state.lpop(); | |
629 state.lpop(); | |
630 state.lpush(); | |
631 break; | |
632 case Bytecodes::_ishl: | |
633 case Bytecodes::_ishr: | |
634 case Bytecodes::_iushr: | |
635 state.spop(); | |
636 state.spop(); | |
637 state.spush(); | |
638 break; | |
639 case Bytecodes::_lshl: | |
640 case Bytecodes::_lshr: | |
641 case Bytecodes::_lushr: | |
642 state.spop(); | |
643 state.lpop(); | |
644 state.lpush(); | |
645 break; | |
646 case Bytecodes::_ineg: | |
647 case Bytecodes::_fneg: | |
648 state.spop(); | |
649 state.spush(); | |
650 break; | |
651 case Bytecodes::_lneg: | |
652 case Bytecodes::_dneg: | |
653 state.lpop(); | |
654 state.lpush(); | |
655 break; | |
656 case Bytecodes::_iinc: | |
657 break; | |
658 case Bytecodes::_i2l: | |
659 case Bytecodes::_i2d: | |
660 case Bytecodes::_f2l: | |
661 case Bytecodes::_f2d: | |
662 state.spop(); | |
663 state.lpush(); | |
664 break; | |
665 case Bytecodes::_i2f: | |
666 case Bytecodes::_f2i: | |
667 state.spop(); | |
668 state.spush(); | |
669 break; | |
670 case Bytecodes::_l2i: | |
671 case Bytecodes::_l2f: | |
672 case Bytecodes::_d2i: | |
673 case Bytecodes::_d2f: | |
674 state.lpop(); | |
675 state.spush(); | |
676 break; | |
677 case Bytecodes::_l2d: | |
678 case Bytecodes::_d2l: | |
679 state.lpop(); | |
680 state.lpush(); | |
681 break; | |
682 case Bytecodes::_i2b: | |
683 case Bytecodes::_i2c: | |
684 case Bytecodes::_i2s: | |
685 state.spop(); | |
686 state.spush(); | |
687 break; | |
688 case Bytecodes::_lcmp: | |
689 case Bytecodes::_dcmpl: | |
690 case Bytecodes::_dcmpg: | |
691 state.lpop(); | |
692 state.lpop(); | |
693 state.spush(); | |
694 break; | |
695 case Bytecodes::_fcmpl: | |
696 case Bytecodes::_fcmpg: | |
697 state.spop(); | |
698 state.spop(); | |
699 state.spush(); | |
700 break; | |
701 case Bytecodes::_ifeq: | |
702 case Bytecodes::_ifne: | |
703 case Bytecodes::_iflt: | |
704 case Bytecodes::_ifge: | |
705 case Bytecodes::_ifgt: | |
706 case Bytecodes::_ifle: | |
707 { | |
708 state.spop(); | |
709 int dest_bci = s.get_dest(); | |
710 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
711 assert(s.next_bci() == limit_bci, "branch must end block"); | |
712 successors.push(_methodBlocks->block_containing(dest_bci)); | |
713 break; | |
714 } | |
715 case Bytecodes::_if_icmpeq: | |
716 case Bytecodes::_if_icmpne: | |
717 case Bytecodes::_if_icmplt: | |
718 case Bytecodes::_if_icmpge: | |
719 case Bytecodes::_if_icmpgt: | |
720 case Bytecodes::_if_icmple: | |
721 { | |
722 state.spop(); | |
723 state.spop(); | |
724 int dest_bci = s.get_dest(); | |
725 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
726 assert(s.next_bci() == limit_bci, "branch must end block"); | |
727 successors.push(_methodBlocks->block_containing(dest_bci)); | |
728 break; | |
729 } | |
730 case Bytecodes::_if_acmpeq: | |
731 case Bytecodes::_if_acmpne: | |
732 { | |
733 set_method_escape(state.apop()); | |
734 set_method_escape(state.apop()); | |
735 int dest_bci = s.get_dest(); | |
736 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
737 assert(s.next_bci() == limit_bci, "branch must end block"); | |
738 successors.push(_methodBlocks->block_containing(dest_bci)); | |
739 break; | |
740 } | |
741 case Bytecodes::_goto: | |
742 { | |
743 int dest_bci = s.get_dest(); | |
744 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
745 assert(s.next_bci() == limit_bci, "branch must end block"); | |
746 successors.push(_methodBlocks->block_containing(dest_bci)); | |
747 fall_through = false; | |
748 break; | |
749 } | |
750 case Bytecodes::_jsr: | |
751 { | |
752 int dest_bci = s.get_dest(); | |
753 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
754 assert(s.next_bci() == limit_bci, "branch must end block"); | |
755 state.apush(empty_map); | |
756 successors.push(_methodBlocks->block_containing(dest_bci)); | |
757 fall_through = false; | |
758 break; | |
759 } | |
760 case Bytecodes::_ret: | |
761 // we don't track the destination of a "ret" instruction | |
762 assert(s.next_bci() == limit_bci, "branch must end block"); | |
763 fall_through = false; | |
764 break; | |
765 case Bytecodes::_return: | |
766 assert(s.next_bci() == limit_bci, "return must end block"); | |
767 fall_through = false; | |
768 break; | |
769 case Bytecodes::_tableswitch: | |
770 { | |
771 state.spop(); | |
2142 | 772 Bytecode_tableswitch sw(&s); |
773 int len = sw.length(); | |
0 | 774 int dest_bci; |
775 for (int i = 0; i < len; i++) { | |
2142 | 776 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
0 | 777 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
778 successors.push(_methodBlocks->block_containing(dest_bci)); | |
779 } | |
2142 | 780 dest_bci = s.cur_bci() + sw.default_offset(); |
0 | 781 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
782 successors.push(_methodBlocks->block_containing(dest_bci)); | |
783 assert(s.next_bci() == limit_bci, "branch must end block"); | |
784 fall_through = false; | |
785 break; | |
786 } | |
787 case Bytecodes::_lookupswitch: | |
788 { | |
789 state.spop(); | |
2142 | 790 Bytecode_lookupswitch sw(&s); |
791 int len = sw.number_of_pairs(); | |
0 | 792 int dest_bci; |
793 for (int i = 0; i < len; i++) { | |
2142 | 794 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
0 | 795 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
796 successors.push(_methodBlocks->block_containing(dest_bci)); | |
797 } | |
2142 | 798 dest_bci = s.cur_bci() + sw.default_offset(); |
0 | 799 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
800 successors.push(_methodBlocks->block_containing(dest_bci)); | |
801 fall_through = false; | |
802 break; | |
803 } | |
804 case Bytecodes::_ireturn: | |
805 case Bytecodes::_freturn: | |
806 state.spop(); | |
807 fall_through = false; | |
808 break; | |
809 case Bytecodes::_lreturn: | |
810 case Bytecodes::_dreturn: | |
811 state.lpop(); | |
812 fall_through = false; | |
813 break; | |
814 case Bytecodes::_areturn: | |
815 set_returned(state.apop()); | |
816 fall_through = false; | |
817 break; | |
818 case Bytecodes::_getstatic: | |
819 case Bytecodes::_getfield: | |
820 { bool will_link; | |
821 ciField* field = s.get_field(will_link); | |
822 BasicType field_type = field->type()->basic_type(); | |
823 if (s.cur_bc() != Bytecodes::_getstatic) { | |
824 set_method_escape(state.apop()); | |
825 } | |
826 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
827 state.apush(unknown_obj); | |
828 } else if (type2size[field_type] == 1) { | |
829 state.spush(); | |
830 } else { | |
831 state.lpush(); | |
832 } | |
833 } | |
834 break; | |
835 case Bytecodes::_putstatic: | |
836 case Bytecodes::_putfield: | |
837 { bool will_link; | |
838 ciField* field = s.get_field(will_link); | |
839 BasicType field_type = field->type()->basic_type(); | |
840 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
841 set_global_escape(state.apop()); | |
842 } else if (type2size[field_type] == 1) { | |
843 state.spop(); | |
844 } else { | |
845 state.lpop(); | |
846 } | |
847 if (s.cur_bc() != Bytecodes::_putstatic) { | |
848 ArgumentMap p = state.apop(); | |
849 set_method_escape(p); | |
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850 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
0 | 851 } |
852 } | |
853 break; | |
854 case Bytecodes::_invokevirtual: | |
855 case Bytecodes::_invokespecial: | |
856 case Bytecodes::_invokestatic: | |
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857 case Bytecodes::_invokedynamic: |
0 | 858 case Bytecodes::_invokeinterface: |
859 { bool will_link; | |
860 ciMethod* target = s.get_method(will_link); | |
861 ciKlass* holder = s.get_declared_method_holder(); | |
862 invoke(state, s.cur_bc(), target, holder); | |
863 ciType* return_type = target->return_type(); | |
864 if (!return_type->is_primitive_type()) { | |
865 state.apush(unknown_obj); | |
866 } else if (return_type->is_one_word()) { | |
867 state.spush(); | |
868 } else if (return_type->is_two_word()) { | |
869 state.lpush(); | |
870 } | |
871 } | |
872 break; | |
873 case Bytecodes::_new: | |
874 state.apush(allocated_obj); | |
875 break; | |
876 case Bytecodes::_newarray: | |
877 case Bytecodes::_anewarray: | |
878 state.spop(); | |
879 state.apush(allocated_obj); | |
880 break; | |
881 case Bytecodes::_multianewarray: | |
882 { int i = s.cur_bcp()[3]; | |
883 while (i-- > 0) state.spop(); | |
884 state.apush(allocated_obj); | |
885 } | |
886 break; | |
887 case Bytecodes::_arraylength: | |
888 set_method_escape(state.apop()); | |
889 state.spush(); | |
890 break; | |
891 case Bytecodes::_athrow: | |
892 set_global_escape(state.apop()); | |
893 fall_through = false; | |
894 break; | |
895 case Bytecodes::_checkcast: | |
896 { ArgumentMap obj = state.apop(); | |
897 set_method_escape(obj); | |
898 state.apush(obj); | |
899 } | |
900 break; | |
901 case Bytecodes::_instanceof: | |
902 set_method_escape(state.apop()); | |
903 state.spush(); | |
904 break; | |
905 case Bytecodes::_monitorenter: | |
906 case Bytecodes::_monitorexit: | |
907 state.apop(); | |
908 break; | |
909 case Bytecodes::_wide: | |
910 ShouldNotReachHere(); | |
911 break; | |
912 case Bytecodes::_ifnull: | |
913 case Bytecodes::_ifnonnull: | |
914 { | |
915 set_method_escape(state.apop()); | |
916 int dest_bci = s.get_dest(); | |
917 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
918 assert(s.next_bci() == limit_bci, "branch must end block"); | |
919 successors.push(_methodBlocks->block_containing(dest_bci)); | |
920 break; | |
921 } | |
922 case Bytecodes::_goto_w: | |
923 { | |
924 int dest_bci = s.get_far_dest(); | |
925 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
926 assert(s.next_bci() == limit_bci, "branch must end block"); | |
927 successors.push(_methodBlocks->block_containing(dest_bci)); | |
928 fall_through = false; | |
929 break; | |
930 } | |
931 case Bytecodes::_jsr_w: | |
932 { | |
933 int dest_bci = s.get_far_dest(); | |
934 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
935 assert(s.next_bci() == limit_bci, "branch must end block"); | |
936 state.apush(empty_map); | |
937 successors.push(_methodBlocks->block_containing(dest_bci)); | |
938 fall_through = false; | |
939 break; | |
940 } | |
941 case Bytecodes::_breakpoint: | |
942 break; | |
943 default: | |
944 ShouldNotReachHere(); | |
945 break; | |
946 } | |
947 | |
948 } | |
949 if (fall_through) { | |
950 int fall_through_bci = s.cur_bci(); | |
951 if (fall_through_bci < _method->code_size()) { | |
952 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
953 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
954 } | |
955 } | |
956 } | |
957 | |
958 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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959 StateInfo *d_state = blockstates + dest->index(); |
0 | 960 int nlocals = _method->max_locals(); |
961 | |
962 // exceptions may cause transfer of control to handlers in the middle of a | |
963 // block, so we don't merge the incoming state of exception handlers | |
964 if (dest->is_handler()) | |
965 return; | |
966 if (!d_state->_initialized ) { | |
967 // destination not initialized, just copy | |
968 for (int i = 0; i < nlocals; i++) { | |
969 d_state->_vars[i] = s_state->_vars[i]; | |
970 } | |
971 for (int i = 0; i < s_state->_stack_height; i++) { | |
972 d_state->_stack[i] = s_state->_stack[i]; | |
973 } | |
974 d_state->_stack_height = s_state->_stack_height; | |
975 d_state->_max_stack = s_state->_max_stack; | |
976 d_state->_initialized = true; | |
977 } else if (!dest->processed()) { | |
978 // we have not yet walked the bytecodes of dest, we can merge | |
979 // the states | |
980 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
981 for (int i = 0; i < nlocals; i++) { | |
982 d_state->_vars[i].set_union(s_state->_vars[i]); | |
983 } | |
984 for (int i = 0; i < s_state->_stack_height; i++) { | |
985 d_state->_stack[i].set_union(s_state->_stack[i]); | |
986 } | |
987 } else { | |
988 // the bytecodes of dest have already been processed, mark any | |
989 // arguments in the source state which are not in the dest state | |
990 // as global escape. | |
991 // Future refinement: we only need to mark these variable to the | |
992 // maximum escape of any variables in dest state | |
993 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
994 ArgumentMap extra_vars; | |
995 for (int i = 0; i < nlocals; i++) { | |
996 ArgumentMap t; | |
997 t = s_state->_vars[i]; | |
998 t.set_difference(d_state->_vars[i]); | |
999 extra_vars.set_union(t); | |
1000 } | |
1001 for (int i = 0; i < s_state->_stack_height; i++) { | |
1002 ArgumentMap t; | |
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1003 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
0 | 1004 t.clear(); |
1005 t = s_state->_stack[i]; | |
1006 t.set_difference(d_state->_stack[i]); | |
1007 extra_vars.set_union(t); | |
1008 } | |
1009 set_global_escape(extra_vars); | |
1010 } | |
1011 } | |
1012 | |
1013 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
1014 int numblocks = _methodBlocks->num_blocks(); | |
1015 int stkSize = _method->max_stack(); | |
1016 int numLocals = _method->max_locals(); | |
1017 StateInfo state; | |
1018 | |
1019 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
1020 int datasize = datacount * sizeof(ArgumentMap); | |
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1021 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
0 | 1022 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
1023 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
1024 ArgumentMap *dp = statedata; | |
1025 state._vars = dp; | |
1026 dp += numLocals; | |
1027 state._stack = dp; | |
1028 dp += stkSize; | |
1029 state._initialized = false; | |
1030 state._max_stack = stkSize; | |
1031 for (int i = 0; i < numblocks; i++) { | |
1032 blockstates[i]._vars = dp; | |
1033 dp += numLocals; | |
1034 blockstates[i]._stack = dp; | |
1035 dp += stkSize; | |
1036 blockstates[i]._initialized = false; | |
1037 blockstates[i]._stack_height = 0; | |
1038 blockstates[i]._max_stack = stkSize; | |
1039 } | |
1040 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
1041 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
1042 | |
1043 _methodBlocks->clear_processed(); | |
1044 | |
1045 // initialize block 0 state from method signature | |
1046 ArgumentMap allVars; // all oop arguments to method | |
1047 ciSignature* sig = method()->signature(); | |
1048 int j = 0; | |
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1049 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1050 int fb_i = first_blk->index(); |
0 | 1051 if (!method()->is_static()) { |
1052 // record information for "this" | |
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1053 blockstates[fb_i]._vars[j].set(j); |
0 | 1054 allVars.add(j); |
1055 j++; | |
1056 } | |
1057 for (int i = 0; i < sig->count(); i++) { | |
1058 ciType* t = sig->type_at(i); | |
1059 if (!t->is_primitive_type()) { | |
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1060 blockstates[fb_i]._vars[j].set(j); |
0 | 1061 allVars.add(j); |
1062 } | |
1063 j += t->size(); | |
1064 } | |
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1065 blockstates[fb_i]._initialized = true; |
0 | 1066 assert(j == _arg_size, "just checking"); |
1067 | |
1068 ArgumentMap unknown_map; | |
1069 unknown_map.add_unknown(); | |
1070 | |
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1071 worklist.push(first_blk); |
0 | 1072 while(worklist.length() > 0) { |
1073 ciBlock *blk = worklist.pop(); | |
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1074 StateInfo *blkState = blockstates + blk->index(); |
0 | 1075 if (blk->is_handler() || blk->is_ret_target()) { |
1076 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1077 // that any variable could contain any argument |
0 | 1078 for (int i = 0; i < numLocals; i++) { |
1079 state._vars[i] = allVars; | |
1080 } | |
1081 if (blk->is_handler()) { | |
1082 state._stack_height = 1; | |
1083 } else { | |
1084 state._stack_height = blkState->_stack_height; | |
1085 } | |
1086 for (int i = 0; i < state._stack_height; i++) { | |
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1087 // ??? should this be unknown_map ??? |
0 | 1088 state._stack[i] = allVars; |
1089 } | |
1090 } else { | |
1091 for (int i = 0; i < numLocals; i++) { | |
1092 state._vars[i] = blkState->_vars[i]; | |
1093 } | |
1094 for (int i = 0; i < blkState->_stack_height; i++) { | |
1095 state._stack[i] = blkState->_stack[i]; | |
1096 } | |
1097 state._stack_height = blkState->_stack_height; | |
1098 } | |
1099 iterate_one_block(blk, state, successors); | |
1100 // if this block has any exception handlers, push them | |
1101 // onto successor list | |
1102 if (blk->has_handler()) { | |
1103 DEBUG_ONLY(int handler_count = 0;) | |
1104 int blk_start = blk->start_bci(); | |
1105 int blk_end = blk->limit_bci(); | |
1106 for (int i = 0; i < numblocks; i++) { | |
1107 ciBlock *b = _methodBlocks->block(i); | |
1108 if (b->is_handler()) { | |
1109 int ex_start = b->ex_start_bci(); | |
1110 int ex_end = b->ex_limit_bci(); | |
1111 if ((ex_start >= blk_start && ex_start < blk_end) || | |
1112 (ex_end > blk_start && ex_end <= blk_end)) { | |
1113 successors.push(b); | |
1114 } | |
1115 DEBUG_ONLY(handler_count++;) | |
1116 } | |
1117 } | |
1118 assert(handler_count > 0, "must find at least one handler"); | |
1119 } | |
1120 // merge computed variable state with successors | |
1121 while(successors.length() > 0) { | |
1122 ciBlock *succ = successors.pop(); | |
1123 merge_block_states(blockstates, succ, &state); | |
1124 if (!succ->processed()) | |
1125 worklist.push(succ); | |
1126 } | |
1127 } | |
1128 } | |
1129 | |
1130 bool BCEscapeAnalyzer::do_analysis() { | |
1131 Arena* arena = CURRENT_ENV->arena(); | |
1132 // identify basic blocks | |
1133 _methodBlocks = _method->get_method_blocks(); | |
1134 | |
1135 iterate_blocks(arena); | |
1136 // TEMPORARY | |
1137 return true; | |
1138 } | |
1139 | |
1140 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
1141 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
1142 | |
1143 if (iid == vmIntrinsics::_getClass || | |
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1144 iid == vmIntrinsics::_fillInStackTrace || |
0 | 1145 iid == vmIntrinsics::_hashCode) |
1146 return iid; | |
1147 else | |
1148 return vmIntrinsics::_none; | |
1149 } | |
1150 | |
1151 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1152 ArgumentMap arg; |
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1153 arg.clear(); |
0 | 1154 switch (iid) { |
1155 case vmIntrinsics::_getClass: | |
1156 _return_local = false; | |
1157 break; | |
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1158 case vmIntrinsics::_fillInStackTrace: |
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1159 arg.set(0); // 'this' |
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1160 set_returned(arg); |
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1161 break; |
0 | 1162 case vmIntrinsics::_hashCode: |
1163 // initialized state is correct | |
1164 break; | |
1165 default: | |
1166 assert(false, "unexpected intrinsic"); | |
1167 } | |
1168 return true; | |
1169 } | |
1170 | |
1171 void BCEscapeAnalyzer::initialize() { | |
1172 int i; | |
1173 | |
1174 // clear escape information (method may have been deoptimized) | |
1175 methodData()->clear_escape_info(); | |
1176 | |
1177 // initialize escape state of object parameters | |
1178 ciSignature* sig = method()->signature(); | |
1179 int j = 0; | |
1180 if (!method()->is_static()) { | |
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1181 _arg_local.set(0); |
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1182 _arg_stack.set(0); |
0 | 1183 j++; |
1184 } | |
1185 for (i = 0; i < sig->count(); i++) { | |
1186 ciType* t = sig->type_at(i); | |
1187 if (!t->is_primitive_type()) { | |
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1188 _arg_local.set(j); |
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1189 _arg_stack.set(j); |
0 | 1190 } |
1191 j += t->size(); | |
1192 } | |
1193 assert(j == _arg_size, "just checking"); | |
1194 | |
1195 // start with optimistic assumption | |
1196 ciType *rt = _method->return_type(); | |
1197 if (rt->is_primitive_type()) { | |
1198 _return_local = false; | |
1199 _return_allocated = false; | |
1200 } else { | |
1201 _return_local = true; | |
1202 _return_allocated = true; | |
1203 } | |
1204 _allocated_escapes = false; | |
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1205 _unknown_modified = false; |
0 | 1206 } |
1207 | |
1208 void BCEscapeAnalyzer::clear_escape_info() { | |
1209 ciSignature* sig = method()->signature(); | |
1210 int arg_count = sig->count(); | |
1211 ArgumentMap var; | |
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1212 if (!method()->is_static()) { |
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1213 arg_count++; // allow for "this" |
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1214 } |
0 | 1215 for (int i = 0; i < arg_count; i++) { |
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1216 set_arg_modified(i, OFFSET_ANY, 4); |
0 | 1217 var.clear(); |
1218 var.set(i); | |
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1219 set_modified(var, OFFSET_ANY, 4); |
0 | 1220 set_global_escape(var); |
1221 } | |
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1222 _arg_local.Clear(); |
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1223 _arg_stack.Clear(); |
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1224 _arg_returned.Clear(); |
0 | 1225 _return_local = false; |
1226 _return_allocated = false; | |
1227 _allocated_escapes = true; | |
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1228 _unknown_modified = true; |
0 | 1229 } |
1230 | |
1231 | |
1232 void BCEscapeAnalyzer::compute_escape_info() { | |
1233 int i; | |
1234 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
1235 | |
1236 vmIntrinsics::ID iid = known_intrinsic(); | |
1237 | |
1238 // check if method can be analyzed | |
1239 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
1240 || _level > MaxBCEAEstimateLevel | |
1241 || method()->code_size() > MaxBCEAEstimateSize)) { | |
1242 if (BCEATraceLevel >= 1) { | |
1243 tty->print("Skipping method because: "); | |
1244 if (method()->is_abstract()) | |
1245 tty->print_cr("method is abstract."); | |
1246 else if (method()->is_native()) | |
1247 tty->print_cr("method is native."); | |
1248 else if (!method()->holder()->is_initialized()) | |
1249 tty->print_cr("class of method is not initialized."); | |
1250 else if (_level > MaxBCEAEstimateLevel) | |
1251 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
1252 _level, MaxBCEAEstimateLevel); | |
1253 else if (method()->code_size() > MaxBCEAEstimateSize) | |
1254 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
1255 method()->code_size(), MaxBCEAEstimateSize); | |
1256 else | |
1257 ShouldNotReachHere(); | |
1258 } | |
1259 clear_escape_info(); | |
1260 | |
1261 return; | |
1262 } | |
1263 | |
1264 if (BCEATraceLevel >= 1) { | |
1265 tty->print("[EA] estimating escape information for"); | |
1266 if (iid != vmIntrinsics::_none) | |
1267 tty->print(" intrinsic"); | |
1268 method()->print_short_name(); | |
1269 tty->print_cr(" (%d bytes)", method()->code_size()); | |
1270 } | |
1271 | |
1272 bool success; | |
1273 | |
1274 initialize(); | |
1275 | |
78
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1276 // Do not scan method if it has no object parameters and |
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1277 // does not returns an object (_return_allocated is set in initialize()). |
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1278 if (_arg_local.Size() == 0 && !_return_allocated) { |
78
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1279 // Clear all info since method's bytecode was not analysed and |
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1280 // set pessimistic escape information. |
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1281 clear_escape_info(); |
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1282 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1283 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
0 | 1284 methodData()->set_eflag(methodDataOopDesc::estimated); |
1285 return; | |
1286 } | |
1287 | |
1288 if (iid != vmIntrinsics::_none) | |
1289 success = compute_escape_for_intrinsic(iid); | |
1290 else { | |
1291 success = do_analysis(); | |
1292 } | |
1293 | |
78
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1294 // don't store interprocedural escape information if it introduces |
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1295 // dependencies or if method data is empty |
0 | 1296 // |
1297 if (!has_dependencies() && !methodData()->is_empty()) { | |
1298 for (i = 0; i < _arg_size; i++) { | |
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1299 if (_arg_local.test(i)) { |
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1300 assert(_arg_stack.test(i), "inconsistent escape info"); |
0 | 1301 methodData()->set_arg_local(i); |
1302 methodData()->set_arg_stack(i); | |
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1303 } else if (_arg_stack.test(i)) { |
0 | 1304 methodData()->set_arg_stack(i); |
1305 } | |
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1306 if (_arg_returned.test(i)) { |
0 | 1307 methodData()->set_arg_returned(i); |
1308 } | |
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1309 methodData()->set_arg_modified(i, _arg_modified[i]); |
0 | 1310 } |
1311 if (_return_local) { | |
1312 methodData()->set_eflag(methodDataOopDesc::return_local); | |
1313 } | |
78
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1314 if (_return_allocated) { |
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1315 methodData()->set_eflag(methodDataOopDesc::return_allocated); |
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1316 } |
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1317 if (_allocated_escapes) { |
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1318 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1319 } |
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1320 if (_unknown_modified) { |
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1321 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
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1322 } |
0 | 1323 methodData()->set_eflag(methodDataOopDesc::estimated); |
1324 } | |
1325 } | |
1326 | |
1327 void BCEscapeAnalyzer::read_escape_info() { | |
1328 assert(methodData()->has_escape_info(), "no escape info available"); | |
1329 | |
1330 // read escape information from method descriptor | |
1331 for (int i = 0; i < _arg_size; i++) { | |
1648
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1332 if (methodData()->is_arg_local(i)) |
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1333 _arg_local.set(i); |
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1334 if (methodData()->is_arg_stack(i)) |
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1335 _arg_stack.set(i); |
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1336 if (methodData()->is_arg_returned(i)) |
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1337 _arg_returned.set(i); |
45
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1338 _arg_modified[i] = methodData()->arg_modified(i); |
0 | 1339 } |
1340 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
78
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1341 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated); |
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1342 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes); |
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1343 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified); |
0 | 1344 |
1345 } | |
1346 | |
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1347 #ifndef PRODUCT |
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1348 void BCEscapeAnalyzer::dump() { |
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1349 tty->print("[EA] estimated escape information for"); |
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1350 method()->print_short_name(); |
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1351 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1352 tty->print(" non-escaping args: "); |
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1353 _arg_local.print_on(tty); |
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1354 tty->print(" stack-allocatable args: "); |
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1355 _arg_stack.print_on(tty); |
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1356 if (_return_local) { |
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1357 tty->print(" returned args: "); |
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1358 _arg_returned.print_on(tty); |
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1359 } else if (is_return_allocated()) { |
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1360 tty->print_cr(" return allocated value"); |
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1361 } else { |
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1362 tty->print_cr(" return non-local value"); |
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1363 } |
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1364 tty->print(" modified args: "); |
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1365 for (int i = 0; i < _arg_size; i++) { |
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1366 if (_arg_modified[i] == 0) |
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1367 tty->print(" 0"); |
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1368 else |
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1369 tty->print(" 0x%x", _arg_modified[i]); |
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1370 } |
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1371 tty->cr(); |
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1372 tty->print(" flags: "); |
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1373 if (_return_allocated) |
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1374 tty->print(" return_allocated"); |
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1375 if (_allocated_escapes) |
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1376 tty->print(" allocated_escapes"); |
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1377 if (_unknown_modified) |
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1378 tty->print(" unknown_modified"); |
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1379 tty->cr(); |
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1380 } |
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1381 #endif |
0 | 1382 |
1383 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
1384 : _conservative(method == NULL || !EstimateArgEscape) | |
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1385 , _arena(CURRENT_ENV->arena()) |
0 | 1386 , _method(method) |
1387 , _methodData(method ? method->method_data() : NULL) | |
1388 , _arg_size(method ? method->arg_size() : 0) | |
1648
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1389 , _arg_local(_arena) |
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1390 , _arg_stack(_arena) |
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1391 , _arg_returned(_arena) |
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1392 , _dirty(_arena) |
0 | 1393 , _return_local(false) |
1394 , _return_allocated(false) | |
1395 , _allocated_escapes(false) | |
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1396 , _unknown_modified(false) |
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1397 , _dependencies(_arena, 4, 0, NULL) |
0 | 1398 , _parent(parent) |
1399 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
1400 if (!_conservative) { | |
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1401 _arg_local.Clear(); |
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1402 _arg_stack.Clear(); |
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1403 _arg_returned.Clear(); |
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1404 _dirty.Clear(); |
0 | 1405 Arena* arena = CURRENT_ENV->arena(); |
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1406 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1407 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
0 | 1408 |
1409 if (methodData() == NULL) | |
1410 return; | |
1411 bool printit = _method->should_print_assembly(); | |
1412 if (methodData()->has_escape_info()) { | |
1413 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
1414 method->holder()->name()->as_utf8(), | |
1415 method->name()->as_utf8())); | |
1416 read_escape_info(); | |
1417 } else { | |
1418 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
1419 method->holder()->name()->as_utf8(), | |
1420 method->name()->as_utf8())); | |
1421 | |
1422 compute_escape_info(); | |
1423 methodData()->update_escape_info(); | |
1424 } | |
78
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1425 #ifndef PRODUCT |
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1426 if (BCEATraceLevel >= 3) { |
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1427 // dump escape information |
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1428 dump(); |
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1429 } |
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1430 #endif |
0 | 1431 } |
1432 } | |
1433 | |
1434 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
1397
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1435 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
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1436 // Also record evol dependencies so redefinition of the |
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1437 // callee will trigger recompilation. |
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1438 deps->assert_evol_method(method()); |
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1439 } |
0 | 1440 for (int i = 0; i < _dependencies.length(); i+=2) { |
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1441 ciKlass *k = _dependencies.at(i)->as_klass(); |
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1442 ciMethod *m = _dependencies.at(i+1)->as_method(); |
0 | 1443 deps->assert_unique_concrete_method(k, m); |
1444 } | |
1445 } |