Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 3763:e66f38dd58a9
Merge
author | ysr |
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
parents | 548597e74aa4 |
children | cc81b9c09bbb |
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 |
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235 int arg_size = target->invoke_arg_size(code); |
0 | 236 int arg_base = MAX2(state._stack_height - arg_size, 0); |
237 | |
238 // direct recursive calls are skipped if they can be bound statically without introducing | |
239 // dependencies and if parameters are passed at the same position as in the current method | |
240 // other calls are skipped if there are no unescaped arguments passed to them | |
241 bool directly_recursive = (method() == target) && | |
242 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
243 | |
244 // check if analysis of callee can safely be skipped | |
245 bool skip_callee = true; | |
246 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
247 ArgumentMap arg = state._stack[i]; | |
248 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
249 } | |
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250 // For now we conservatively skip invokedynamic. |
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251 if (code == Bytecodes::_invokedynamic) { |
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252 skip_callee = true; |
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253 } |
0 | 254 if (skip_callee) { |
255 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
256 for (i = 0; i < arg_size; i++) { | |
257 set_method_escape(state.raw_pop()); | |
258 } | |
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259 _unknown_modified = true; // assume the worst since we don't analyze the called method |
0 | 260 return; |
261 } | |
262 | |
263 // determine actual method (use CHA if necessary) | |
264 ciMethod* inline_target = NULL; | |
265 if (target->is_loaded() && klass->is_loaded() | |
266 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
267 && target->will_link(klass, callee_holder, code)) { | |
268 if (code == Bytecodes::_invokestatic | |
269 || code == Bytecodes::_invokespecial | |
270 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
271 inline_target = target; | |
272 } else { | |
273 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
274 } | |
275 } | |
276 | |
277 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
278 // analyze callee | |
279 BCEscapeAnalyzer analyzer(inline_target, this); | |
280 | |
281 // adjust escape state of actual parameters | |
282 bool must_record_dependencies = false; | |
283 for (i = arg_size - 1; i >= 0; i--) { | |
284 ArgumentMap arg = state.raw_pop(); | |
285 if (!is_argument(arg)) | |
286 continue; | |
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287 for (int j = 0; j < _arg_size; j++) { |
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288 if (arg.contains(j)) { |
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289 _arg_modified[j] |= analyzer._arg_modified[i]; |
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290 } |
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291 } |
0 | 292 if (!is_arg_stack(arg)) { |
293 // arguments have already been recognized as escaping | |
294 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
295 set_method_escape(arg); | |
296 must_record_dependencies = true; | |
297 } else { | |
298 set_global_escape(arg); | |
299 } | |
300 } | |
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301 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
0 | 302 |
303 // record dependencies if at least one parameter retained stack-allocatable | |
304 if (must_record_dependencies) { | |
305 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
306 _dependencies.append(actual_recv); | |
307 _dependencies.append(inline_target); | |
308 } | |
309 _dependencies.appendAll(analyzer.dependencies()); | |
310 } | |
311 } else { | |
312 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
313 target->name()->as_utf8())); | |
314 // conservatively mark all actual parameters as escaping globally | |
315 for (i = 0; i < arg_size; i++) { | |
316 ArgumentMap arg = state.raw_pop(); | |
317 if (!is_argument(arg)) | |
318 continue; | |
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319 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 320 set_global_escape(arg); |
321 } | |
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322 _unknown_modified = true; // assume the worst since we don't know the called method |
0 | 323 } |
324 } | |
325 | |
326 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
327 return ((~arg_set1) | arg_set2) == 0; | |
328 } | |
329 | |
330 | |
331 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
332 | |
333 blk->set_processed(); | |
334 ciBytecodeStream s(method()); | |
335 int limit_bci = blk->limit_bci(); | |
336 bool fall_through = false; | |
337 ArgumentMap allocated_obj; | |
338 allocated_obj.add_allocated(); | |
339 ArgumentMap unknown_obj; | |
340 unknown_obj.add_unknown(); | |
341 ArgumentMap empty_map; | |
342 | |
343 s.reset_to_bci(blk->start_bci()); | |
344 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
345 fall_through = true; | |
346 switch (s.cur_bc()) { | |
347 case Bytecodes::_nop: | |
348 break; | |
349 case Bytecodes::_aconst_null: | |
350 state.apush(empty_map); | |
351 break; | |
352 case Bytecodes::_iconst_m1: | |
353 case Bytecodes::_iconst_0: | |
354 case Bytecodes::_iconst_1: | |
355 case Bytecodes::_iconst_2: | |
356 case Bytecodes::_iconst_3: | |
357 case Bytecodes::_iconst_4: | |
358 case Bytecodes::_iconst_5: | |
359 case Bytecodes::_fconst_0: | |
360 case Bytecodes::_fconst_1: | |
361 case Bytecodes::_fconst_2: | |
362 case Bytecodes::_bipush: | |
363 case Bytecodes::_sipush: | |
364 state.spush(); | |
365 break; | |
366 case Bytecodes::_lconst_0: | |
367 case Bytecodes::_lconst_1: | |
368 case Bytecodes::_dconst_0: | |
369 case Bytecodes::_dconst_1: | |
370 state.lpush(); | |
371 break; | |
372 case Bytecodes::_ldc: | |
373 case Bytecodes::_ldc_w: | |
374 case Bytecodes::_ldc2_w: | |
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375 { |
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376 // Avoid calling get_constant() which will try to allocate |
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377 // unloaded constant. We need only constant's type. |
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378 int index = s.get_constant_pool_index(); |
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379 constantTag tag = s.get_constant_pool_tag(index); |
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380 if (tag.is_long() || tag.is_double()) { |
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381 // Only longs and doubles use 2 stack slots. |
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382 state.lpush(); |
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383 } else { |
0 | 384 state.spush(); |
385 } | |
386 break; | |
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387 } |
0 | 388 case Bytecodes::_aload: |
389 state.apush(state._vars[s.get_index()]); | |
390 break; | |
391 case Bytecodes::_iload: | |
392 case Bytecodes::_fload: | |
393 case Bytecodes::_iload_0: | |
394 case Bytecodes::_iload_1: | |
395 case Bytecodes::_iload_2: | |
396 case Bytecodes::_iload_3: | |
397 case Bytecodes::_fload_0: | |
398 case Bytecodes::_fload_1: | |
399 case Bytecodes::_fload_2: | |
400 case Bytecodes::_fload_3: | |
401 state.spush(); | |
402 break; | |
403 case Bytecodes::_lload: | |
404 case Bytecodes::_dload: | |
405 case Bytecodes::_lload_0: | |
406 case Bytecodes::_lload_1: | |
407 case Bytecodes::_lload_2: | |
408 case Bytecodes::_lload_3: | |
409 case Bytecodes::_dload_0: | |
410 case Bytecodes::_dload_1: | |
411 case Bytecodes::_dload_2: | |
412 case Bytecodes::_dload_3: | |
413 state.lpush(); | |
414 break; | |
415 case Bytecodes::_aload_0: | |
416 state.apush(state._vars[0]); | |
417 break; | |
418 case Bytecodes::_aload_1: | |
419 state.apush(state._vars[1]); | |
420 break; | |
421 case Bytecodes::_aload_2: | |
422 state.apush(state._vars[2]); | |
423 break; | |
424 case Bytecodes::_aload_3: | |
425 state.apush(state._vars[3]); | |
426 break; | |
427 case Bytecodes::_iaload: | |
428 case Bytecodes::_faload: | |
429 case Bytecodes::_baload: | |
430 case Bytecodes::_caload: | |
431 case Bytecodes::_saload: | |
432 state.spop(); | |
433 set_method_escape(state.apop()); | |
434 state.spush(); | |
435 break; | |
436 case Bytecodes::_laload: | |
437 case Bytecodes::_daload: | |
438 state.spop(); | |
439 set_method_escape(state.apop()); | |
440 state.lpush(); | |
441 break; | |
442 case Bytecodes::_aaload: | |
443 { state.spop(); | |
444 ArgumentMap array = state.apop(); | |
445 set_method_escape(array); | |
446 state.apush(unknown_obj); | |
447 set_dirty(array); | |
448 } | |
449 break; | |
450 case Bytecodes::_istore: | |
451 case Bytecodes::_fstore: | |
452 case Bytecodes::_istore_0: | |
453 case Bytecodes::_istore_1: | |
454 case Bytecodes::_istore_2: | |
455 case Bytecodes::_istore_3: | |
456 case Bytecodes::_fstore_0: | |
457 case Bytecodes::_fstore_1: | |
458 case Bytecodes::_fstore_2: | |
459 case Bytecodes::_fstore_3: | |
460 state.spop(); | |
461 break; | |
462 case Bytecodes::_lstore: | |
463 case Bytecodes::_dstore: | |
464 case Bytecodes::_lstore_0: | |
465 case Bytecodes::_lstore_1: | |
466 case Bytecodes::_lstore_2: | |
467 case Bytecodes::_lstore_3: | |
468 case Bytecodes::_dstore_0: | |
469 case Bytecodes::_dstore_1: | |
470 case Bytecodes::_dstore_2: | |
471 case Bytecodes::_dstore_3: | |
472 state.lpop(); | |
473 break; | |
474 case Bytecodes::_astore: | |
475 state._vars[s.get_index()] = state.apop(); | |
476 break; | |
477 case Bytecodes::_astore_0: | |
478 state._vars[0] = state.apop(); | |
479 break; | |
480 case Bytecodes::_astore_1: | |
481 state._vars[1] = state.apop(); | |
482 break; | |
483 case Bytecodes::_astore_2: | |
484 state._vars[2] = state.apop(); | |
485 break; | |
486 case Bytecodes::_astore_3: | |
487 state._vars[3] = state.apop(); | |
488 break; | |
489 case Bytecodes::_iastore: | |
490 case Bytecodes::_fastore: | |
491 case Bytecodes::_bastore: | |
492 case Bytecodes::_castore: | |
493 case Bytecodes::_sastore: | |
494 { | |
495 state.spop(); | |
496 state.spop(); | |
497 ArgumentMap arr = state.apop(); | |
498 set_method_escape(arr); | |
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499 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 500 break; |
501 } | |
502 case Bytecodes::_lastore: | |
503 case Bytecodes::_dastore: | |
504 { | |
505 state.lpop(); | |
506 state.spop(); | |
507 ArgumentMap arr = state.apop(); | |
508 set_method_escape(arr); | |
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509 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
0 | 510 break; |
511 } | |
512 case Bytecodes::_aastore: | |
513 { | |
514 set_global_escape(state.apop()); | |
515 state.spop(); | |
516 ArgumentMap arr = state.apop(); | |
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517 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
0 | 518 break; |
519 } | |
520 case Bytecodes::_pop: | |
521 state.raw_pop(); | |
522 break; | |
523 case Bytecodes::_pop2: | |
524 state.raw_pop(); | |
525 state.raw_pop(); | |
526 break; | |
527 case Bytecodes::_dup: | |
528 { ArgumentMap w1 = state.raw_pop(); | |
529 state.raw_push(w1); | |
530 state.raw_push(w1); | |
531 } | |
532 break; | |
533 case Bytecodes::_dup_x1: | |
534 { ArgumentMap w1 = state.raw_pop(); | |
535 ArgumentMap w2 = state.raw_pop(); | |
536 state.raw_push(w1); | |
537 state.raw_push(w2); | |
538 state.raw_push(w1); | |
539 } | |
540 break; | |
541 case Bytecodes::_dup_x2: | |
542 { ArgumentMap w1 = state.raw_pop(); | |
543 ArgumentMap w2 = state.raw_pop(); | |
544 ArgumentMap w3 = state.raw_pop(); | |
545 state.raw_push(w1); | |
546 state.raw_push(w3); | |
547 state.raw_push(w2); | |
548 state.raw_push(w1); | |
549 } | |
550 break; | |
551 case Bytecodes::_dup2: | |
552 { ArgumentMap w1 = state.raw_pop(); | |
553 ArgumentMap w2 = state.raw_pop(); | |
554 state.raw_push(w2); | |
555 state.raw_push(w1); | |
556 state.raw_push(w2); | |
557 state.raw_push(w1); | |
558 } | |
559 break; | |
560 case Bytecodes::_dup2_x1: | |
561 { ArgumentMap w1 = state.raw_pop(); | |
562 ArgumentMap w2 = state.raw_pop(); | |
563 ArgumentMap w3 = state.raw_pop(); | |
564 state.raw_push(w2); | |
565 state.raw_push(w1); | |
566 state.raw_push(w3); | |
567 state.raw_push(w2); | |
568 state.raw_push(w1); | |
569 } | |
570 break; | |
571 case Bytecodes::_dup2_x2: | |
572 { ArgumentMap w1 = state.raw_pop(); | |
573 ArgumentMap w2 = state.raw_pop(); | |
574 ArgumentMap w3 = state.raw_pop(); | |
575 ArgumentMap w4 = state.raw_pop(); | |
576 state.raw_push(w2); | |
577 state.raw_push(w1); | |
578 state.raw_push(w4); | |
579 state.raw_push(w3); | |
580 state.raw_push(w2); | |
581 state.raw_push(w1); | |
582 } | |
583 break; | |
584 case Bytecodes::_swap: | |
585 { ArgumentMap w1 = state.raw_pop(); | |
586 ArgumentMap w2 = state.raw_pop(); | |
587 state.raw_push(w1); | |
588 state.raw_push(w2); | |
589 } | |
590 break; | |
591 case Bytecodes::_iadd: | |
592 case Bytecodes::_fadd: | |
593 case Bytecodes::_isub: | |
594 case Bytecodes::_fsub: | |
595 case Bytecodes::_imul: | |
596 case Bytecodes::_fmul: | |
597 case Bytecodes::_idiv: | |
598 case Bytecodes::_fdiv: | |
599 case Bytecodes::_irem: | |
600 case Bytecodes::_frem: | |
601 case Bytecodes::_iand: | |
602 case Bytecodes::_ior: | |
603 case Bytecodes::_ixor: | |
604 state.spop(); | |
605 state.spop(); | |
606 state.spush(); | |
607 break; | |
608 case Bytecodes::_ladd: | |
609 case Bytecodes::_dadd: | |
610 case Bytecodes::_lsub: | |
611 case Bytecodes::_dsub: | |
612 case Bytecodes::_lmul: | |
613 case Bytecodes::_dmul: | |
614 case Bytecodes::_ldiv: | |
615 case Bytecodes::_ddiv: | |
616 case Bytecodes::_lrem: | |
617 case Bytecodes::_drem: | |
618 case Bytecodes::_land: | |
619 case Bytecodes::_lor: | |
620 case Bytecodes::_lxor: | |
621 state.lpop(); | |
622 state.lpop(); | |
623 state.lpush(); | |
624 break; | |
625 case Bytecodes::_ishl: | |
626 case Bytecodes::_ishr: | |
627 case Bytecodes::_iushr: | |
628 state.spop(); | |
629 state.spop(); | |
630 state.spush(); | |
631 break; | |
632 case Bytecodes::_lshl: | |
633 case Bytecodes::_lshr: | |
634 case Bytecodes::_lushr: | |
635 state.spop(); | |
636 state.lpop(); | |
637 state.lpush(); | |
638 break; | |
639 case Bytecodes::_ineg: | |
640 case Bytecodes::_fneg: | |
641 state.spop(); | |
642 state.spush(); | |
643 break; | |
644 case Bytecodes::_lneg: | |
645 case Bytecodes::_dneg: | |
646 state.lpop(); | |
647 state.lpush(); | |
648 break; | |
649 case Bytecodes::_iinc: | |
650 break; | |
651 case Bytecodes::_i2l: | |
652 case Bytecodes::_i2d: | |
653 case Bytecodes::_f2l: | |
654 case Bytecodes::_f2d: | |
655 state.spop(); | |
656 state.lpush(); | |
657 break; | |
658 case Bytecodes::_i2f: | |
659 case Bytecodes::_f2i: | |
660 state.spop(); | |
661 state.spush(); | |
662 break; | |
663 case Bytecodes::_l2i: | |
664 case Bytecodes::_l2f: | |
665 case Bytecodes::_d2i: | |
666 case Bytecodes::_d2f: | |
667 state.lpop(); | |
668 state.spush(); | |
669 break; | |
670 case Bytecodes::_l2d: | |
671 case Bytecodes::_d2l: | |
672 state.lpop(); | |
673 state.lpush(); | |
674 break; | |
675 case Bytecodes::_i2b: | |
676 case Bytecodes::_i2c: | |
677 case Bytecodes::_i2s: | |
678 state.spop(); | |
679 state.spush(); | |
680 break; | |
681 case Bytecodes::_lcmp: | |
682 case Bytecodes::_dcmpl: | |
683 case Bytecodes::_dcmpg: | |
684 state.lpop(); | |
685 state.lpop(); | |
686 state.spush(); | |
687 break; | |
688 case Bytecodes::_fcmpl: | |
689 case Bytecodes::_fcmpg: | |
690 state.spop(); | |
691 state.spop(); | |
692 state.spush(); | |
693 break; | |
694 case Bytecodes::_ifeq: | |
695 case Bytecodes::_ifne: | |
696 case Bytecodes::_iflt: | |
697 case Bytecodes::_ifge: | |
698 case Bytecodes::_ifgt: | |
699 case Bytecodes::_ifle: | |
700 { | |
701 state.spop(); | |
702 int dest_bci = s.get_dest(); | |
703 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
704 assert(s.next_bci() == limit_bci, "branch must end block"); | |
705 successors.push(_methodBlocks->block_containing(dest_bci)); | |
706 break; | |
707 } | |
708 case Bytecodes::_if_icmpeq: | |
709 case Bytecodes::_if_icmpne: | |
710 case Bytecodes::_if_icmplt: | |
711 case Bytecodes::_if_icmpge: | |
712 case Bytecodes::_if_icmpgt: | |
713 case Bytecodes::_if_icmple: | |
714 { | |
715 state.spop(); | |
716 state.spop(); | |
717 int dest_bci = s.get_dest(); | |
718 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
719 assert(s.next_bci() == limit_bci, "branch must end block"); | |
720 successors.push(_methodBlocks->block_containing(dest_bci)); | |
721 break; | |
722 } | |
723 case Bytecodes::_if_acmpeq: | |
724 case Bytecodes::_if_acmpne: | |
725 { | |
726 set_method_escape(state.apop()); | |
727 set_method_escape(state.apop()); | |
728 int dest_bci = s.get_dest(); | |
729 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
730 assert(s.next_bci() == limit_bci, "branch must end block"); | |
731 successors.push(_methodBlocks->block_containing(dest_bci)); | |
732 break; | |
733 } | |
734 case Bytecodes::_goto: | |
735 { | |
736 int dest_bci = s.get_dest(); | |
737 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
738 assert(s.next_bci() == limit_bci, "branch must end block"); | |
739 successors.push(_methodBlocks->block_containing(dest_bci)); | |
740 fall_through = false; | |
741 break; | |
742 } | |
743 case Bytecodes::_jsr: | |
744 { | |
745 int dest_bci = s.get_dest(); | |
746 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
747 assert(s.next_bci() == limit_bci, "branch must end block"); | |
748 state.apush(empty_map); | |
749 successors.push(_methodBlocks->block_containing(dest_bci)); | |
750 fall_through = false; | |
751 break; | |
752 } | |
753 case Bytecodes::_ret: | |
754 // we don't track the destination of a "ret" instruction | |
755 assert(s.next_bci() == limit_bci, "branch must end block"); | |
756 fall_through = false; | |
757 break; | |
758 case Bytecodes::_return: | |
759 assert(s.next_bci() == limit_bci, "return must end block"); | |
760 fall_through = false; | |
761 break; | |
762 case Bytecodes::_tableswitch: | |
763 { | |
764 state.spop(); | |
2142 | 765 Bytecode_tableswitch sw(&s); |
766 int len = sw.length(); | |
0 | 767 int dest_bci; |
768 for (int i = 0; i < len; i++) { | |
2142 | 769 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
0 | 770 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
771 successors.push(_methodBlocks->block_containing(dest_bci)); | |
772 } | |
2142 | 773 dest_bci = s.cur_bci() + sw.default_offset(); |
0 | 774 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
775 successors.push(_methodBlocks->block_containing(dest_bci)); | |
776 assert(s.next_bci() == limit_bci, "branch must end block"); | |
777 fall_through = false; | |
778 break; | |
779 } | |
780 case Bytecodes::_lookupswitch: | |
781 { | |
782 state.spop(); | |
2142 | 783 Bytecode_lookupswitch sw(&s); |
784 int len = sw.number_of_pairs(); | |
0 | 785 int dest_bci; |
786 for (int i = 0; i < len; i++) { | |
2142 | 787 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
0 | 788 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
789 successors.push(_methodBlocks->block_containing(dest_bci)); | |
790 } | |
2142 | 791 dest_bci = s.cur_bci() + sw.default_offset(); |
0 | 792 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
793 successors.push(_methodBlocks->block_containing(dest_bci)); | |
794 fall_through = false; | |
795 break; | |
796 } | |
797 case Bytecodes::_ireturn: | |
798 case Bytecodes::_freturn: | |
799 state.spop(); | |
800 fall_through = false; | |
801 break; | |
802 case Bytecodes::_lreturn: | |
803 case Bytecodes::_dreturn: | |
804 state.lpop(); | |
805 fall_through = false; | |
806 break; | |
807 case Bytecodes::_areturn: | |
808 set_returned(state.apop()); | |
809 fall_through = false; | |
810 break; | |
811 case Bytecodes::_getstatic: | |
812 case Bytecodes::_getfield: | |
813 { bool will_link; | |
814 ciField* field = s.get_field(will_link); | |
815 BasicType field_type = field->type()->basic_type(); | |
816 if (s.cur_bc() != Bytecodes::_getstatic) { | |
817 set_method_escape(state.apop()); | |
818 } | |
819 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
820 state.apush(unknown_obj); | |
821 } else if (type2size[field_type] == 1) { | |
822 state.spush(); | |
823 } else { | |
824 state.lpush(); | |
825 } | |
826 } | |
827 break; | |
828 case Bytecodes::_putstatic: | |
829 case Bytecodes::_putfield: | |
830 { bool will_link; | |
831 ciField* field = s.get_field(will_link); | |
832 BasicType field_type = field->type()->basic_type(); | |
833 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
834 set_global_escape(state.apop()); | |
835 } else if (type2size[field_type] == 1) { | |
836 state.spop(); | |
837 } else { | |
838 state.lpop(); | |
839 } | |
840 if (s.cur_bc() != Bytecodes::_putstatic) { | |
841 ArgumentMap p = state.apop(); | |
842 set_method_escape(p); | |
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843 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
0 | 844 } |
845 } | |
846 break; | |
847 case Bytecodes::_invokevirtual: | |
848 case Bytecodes::_invokespecial: | |
849 case Bytecodes::_invokestatic: | |
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850 case Bytecodes::_invokedynamic: |
0 | 851 case Bytecodes::_invokeinterface: |
852 { bool will_link; | |
853 ciMethod* target = s.get_method(will_link); | |
854 ciKlass* holder = s.get_declared_method_holder(); | |
855 invoke(state, s.cur_bc(), target, holder); | |
856 ciType* return_type = target->return_type(); | |
857 if (!return_type->is_primitive_type()) { | |
858 state.apush(unknown_obj); | |
859 } else if (return_type->is_one_word()) { | |
860 state.spush(); | |
861 } else if (return_type->is_two_word()) { | |
862 state.lpush(); | |
863 } | |
864 } | |
865 break; | |
866 case Bytecodes::_new: | |
867 state.apush(allocated_obj); | |
868 break; | |
869 case Bytecodes::_newarray: | |
870 case Bytecodes::_anewarray: | |
871 state.spop(); | |
872 state.apush(allocated_obj); | |
873 break; | |
874 case Bytecodes::_multianewarray: | |
875 { int i = s.cur_bcp()[3]; | |
876 while (i-- > 0) state.spop(); | |
877 state.apush(allocated_obj); | |
878 } | |
879 break; | |
880 case Bytecodes::_arraylength: | |
881 set_method_escape(state.apop()); | |
882 state.spush(); | |
883 break; | |
884 case Bytecodes::_athrow: | |
885 set_global_escape(state.apop()); | |
886 fall_through = false; | |
887 break; | |
888 case Bytecodes::_checkcast: | |
889 { ArgumentMap obj = state.apop(); | |
890 set_method_escape(obj); | |
891 state.apush(obj); | |
892 } | |
893 break; | |
894 case Bytecodes::_instanceof: | |
895 set_method_escape(state.apop()); | |
896 state.spush(); | |
897 break; | |
898 case Bytecodes::_monitorenter: | |
899 case Bytecodes::_monitorexit: | |
900 state.apop(); | |
901 break; | |
902 case Bytecodes::_wide: | |
903 ShouldNotReachHere(); | |
904 break; | |
905 case Bytecodes::_ifnull: | |
906 case Bytecodes::_ifnonnull: | |
907 { | |
908 set_method_escape(state.apop()); | |
909 int dest_bci = s.get_dest(); | |
910 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
911 assert(s.next_bci() == limit_bci, "branch must end block"); | |
912 successors.push(_methodBlocks->block_containing(dest_bci)); | |
913 break; | |
914 } | |
915 case Bytecodes::_goto_w: | |
916 { | |
917 int dest_bci = s.get_far_dest(); | |
918 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
919 assert(s.next_bci() == limit_bci, "branch must end block"); | |
920 successors.push(_methodBlocks->block_containing(dest_bci)); | |
921 fall_through = false; | |
922 break; | |
923 } | |
924 case Bytecodes::_jsr_w: | |
925 { | |
926 int dest_bci = s.get_far_dest(); | |
927 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
928 assert(s.next_bci() == limit_bci, "branch must end block"); | |
929 state.apush(empty_map); | |
930 successors.push(_methodBlocks->block_containing(dest_bci)); | |
931 fall_through = false; | |
932 break; | |
933 } | |
934 case Bytecodes::_breakpoint: | |
935 break; | |
936 default: | |
937 ShouldNotReachHere(); | |
938 break; | |
939 } | |
940 | |
941 } | |
942 if (fall_through) { | |
943 int fall_through_bci = s.cur_bci(); | |
944 if (fall_through_bci < _method->code_size()) { | |
945 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
946 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
947 } | |
948 } | |
949 } | |
950 | |
951 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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952 StateInfo *d_state = blockstates + dest->index(); |
0 | 953 int nlocals = _method->max_locals(); |
954 | |
955 // exceptions may cause transfer of control to handlers in the middle of a | |
956 // block, so we don't merge the incoming state of exception handlers | |
957 if (dest->is_handler()) | |
958 return; | |
959 if (!d_state->_initialized ) { | |
960 // destination not initialized, just copy | |
961 for (int i = 0; i < nlocals; i++) { | |
962 d_state->_vars[i] = s_state->_vars[i]; | |
963 } | |
964 for (int i = 0; i < s_state->_stack_height; i++) { | |
965 d_state->_stack[i] = s_state->_stack[i]; | |
966 } | |
967 d_state->_stack_height = s_state->_stack_height; | |
968 d_state->_max_stack = s_state->_max_stack; | |
969 d_state->_initialized = true; | |
970 } else if (!dest->processed()) { | |
971 // we have not yet walked the bytecodes of dest, we can merge | |
972 // the states | |
973 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
974 for (int i = 0; i < nlocals; i++) { | |
975 d_state->_vars[i].set_union(s_state->_vars[i]); | |
976 } | |
977 for (int i = 0; i < s_state->_stack_height; i++) { | |
978 d_state->_stack[i].set_union(s_state->_stack[i]); | |
979 } | |
980 } else { | |
981 // the bytecodes of dest have already been processed, mark any | |
982 // arguments in the source state which are not in the dest state | |
983 // as global escape. | |
984 // Future refinement: we only need to mark these variable to the | |
985 // maximum escape of any variables in dest state | |
986 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
987 ArgumentMap extra_vars; | |
988 for (int i = 0; i < nlocals; i++) { | |
989 ArgumentMap t; | |
990 t = s_state->_vars[i]; | |
991 t.set_difference(d_state->_vars[i]); | |
992 extra_vars.set_union(t); | |
993 } | |
994 for (int i = 0; i < s_state->_stack_height; i++) { | |
995 ArgumentMap t; | |
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996 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
0 | 997 t.clear(); |
998 t = s_state->_stack[i]; | |
999 t.set_difference(d_state->_stack[i]); | |
1000 extra_vars.set_union(t); | |
1001 } | |
1002 set_global_escape(extra_vars); | |
1003 } | |
1004 } | |
1005 | |
1006 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
1007 int numblocks = _methodBlocks->num_blocks(); | |
1008 int stkSize = _method->max_stack(); | |
1009 int numLocals = _method->max_locals(); | |
1010 StateInfo state; | |
1011 | |
1012 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
1013 int datasize = datacount * sizeof(ArgumentMap); | |
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1014 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
0 | 1015 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
1016 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
1017 ArgumentMap *dp = statedata; | |
1018 state._vars = dp; | |
1019 dp += numLocals; | |
1020 state._stack = dp; | |
1021 dp += stkSize; | |
1022 state._initialized = false; | |
1023 state._max_stack = stkSize; | |
1024 for (int i = 0; i < numblocks; i++) { | |
1025 blockstates[i]._vars = dp; | |
1026 dp += numLocals; | |
1027 blockstates[i]._stack = dp; | |
1028 dp += stkSize; | |
1029 blockstates[i]._initialized = false; | |
1030 blockstates[i]._stack_height = 0; | |
1031 blockstates[i]._max_stack = stkSize; | |
1032 } | |
1033 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
1034 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
1035 | |
1036 _methodBlocks->clear_processed(); | |
1037 | |
1038 // initialize block 0 state from method signature | |
1039 ArgumentMap allVars; // all oop arguments to method | |
1040 ciSignature* sig = method()->signature(); | |
1041 int j = 0; | |
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1042 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1043 int fb_i = first_blk->index(); |
0 | 1044 if (!method()->is_static()) { |
1045 // record information for "this" | |
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1046 blockstates[fb_i]._vars[j].set(j); |
0 | 1047 allVars.add(j); |
1048 j++; | |
1049 } | |
1050 for (int i = 0; i < sig->count(); i++) { | |
1051 ciType* t = sig->type_at(i); | |
1052 if (!t->is_primitive_type()) { | |
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1053 blockstates[fb_i]._vars[j].set(j); |
0 | 1054 allVars.add(j); |
1055 } | |
1056 j += t->size(); | |
1057 } | |
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1058 blockstates[fb_i]._initialized = true; |
0 | 1059 assert(j == _arg_size, "just checking"); |
1060 | |
1061 ArgumentMap unknown_map; | |
1062 unknown_map.add_unknown(); | |
1063 | |
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1064 worklist.push(first_blk); |
0 | 1065 while(worklist.length() > 0) { |
1066 ciBlock *blk = worklist.pop(); | |
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1067 StateInfo *blkState = blockstates + blk->index(); |
0 | 1068 if (blk->is_handler() || blk->is_ret_target()) { |
1069 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1070 // that any variable could contain any argument |
0 | 1071 for (int i = 0; i < numLocals; i++) { |
1072 state._vars[i] = allVars; | |
1073 } | |
1074 if (blk->is_handler()) { | |
1075 state._stack_height = 1; | |
1076 } else { | |
1077 state._stack_height = blkState->_stack_height; | |
1078 } | |
1079 for (int i = 0; i < state._stack_height; i++) { | |
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1080 // ??? should this be unknown_map ??? |
0 | 1081 state._stack[i] = allVars; |
1082 } | |
1083 } else { | |
1084 for (int i = 0; i < numLocals; i++) { | |
1085 state._vars[i] = blkState->_vars[i]; | |
1086 } | |
1087 for (int i = 0; i < blkState->_stack_height; i++) { | |
1088 state._stack[i] = blkState->_stack[i]; | |
1089 } | |
1090 state._stack_height = blkState->_stack_height; | |
1091 } | |
1092 iterate_one_block(blk, state, successors); | |
1093 // if this block has any exception handlers, push them | |
1094 // onto successor list | |
1095 if (blk->has_handler()) { | |
1096 DEBUG_ONLY(int handler_count = 0;) | |
1097 int blk_start = blk->start_bci(); | |
1098 int blk_end = blk->limit_bci(); | |
1099 for (int i = 0; i < numblocks; i++) { | |
1100 ciBlock *b = _methodBlocks->block(i); | |
1101 if (b->is_handler()) { | |
1102 int ex_start = b->ex_start_bci(); | |
1103 int ex_end = b->ex_limit_bci(); | |
1104 if ((ex_start >= blk_start && ex_start < blk_end) || | |
1105 (ex_end > blk_start && ex_end <= blk_end)) { | |
1106 successors.push(b); | |
1107 } | |
1108 DEBUG_ONLY(handler_count++;) | |
1109 } | |
1110 } | |
1111 assert(handler_count > 0, "must find at least one handler"); | |
1112 } | |
1113 // merge computed variable state with successors | |
1114 while(successors.length() > 0) { | |
1115 ciBlock *succ = successors.pop(); | |
1116 merge_block_states(blockstates, succ, &state); | |
1117 if (!succ->processed()) | |
1118 worklist.push(succ); | |
1119 } | |
1120 } | |
1121 } | |
1122 | |
1123 bool BCEscapeAnalyzer::do_analysis() { | |
1124 Arena* arena = CURRENT_ENV->arena(); | |
1125 // identify basic blocks | |
1126 _methodBlocks = _method->get_method_blocks(); | |
1127 | |
1128 iterate_blocks(arena); | |
1129 // TEMPORARY | |
1130 return true; | |
1131 } | |
1132 | |
1133 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
1134 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
1135 | |
1136 if (iid == vmIntrinsics::_getClass || | |
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1137 iid == vmIntrinsics::_fillInStackTrace || |
0 | 1138 iid == vmIntrinsics::_hashCode) |
1139 return iid; | |
1140 else | |
1141 return vmIntrinsics::_none; | |
1142 } | |
1143 | |
1144 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1145 ArgumentMap arg; |
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1146 arg.clear(); |
0 | 1147 switch (iid) { |
1148 case vmIntrinsics::_getClass: | |
1149 _return_local = false; | |
1150 break; | |
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1151 case vmIntrinsics::_fillInStackTrace: |
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1152 arg.set(0); // 'this' |
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1153 set_returned(arg); |
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1154 break; |
0 | 1155 case vmIntrinsics::_hashCode: |
1156 // initialized state is correct | |
1157 break; | |
1158 default: | |
1159 assert(false, "unexpected intrinsic"); | |
1160 } | |
1161 return true; | |
1162 } | |
1163 | |
1164 void BCEscapeAnalyzer::initialize() { | |
1165 int i; | |
1166 | |
1167 // clear escape information (method may have been deoptimized) | |
1168 methodData()->clear_escape_info(); | |
1169 | |
1170 // initialize escape state of object parameters | |
1171 ciSignature* sig = method()->signature(); | |
1172 int j = 0; | |
1173 if (!method()->is_static()) { | |
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1174 _arg_local.set(0); |
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1175 _arg_stack.set(0); |
0 | 1176 j++; |
1177 } | |
1178 for (i = 0; i < sig->count(); i++) { | |
1179 ciType* t = sig->type_at(i); | |
1180 if (!t->is_primitive_type()) { | |
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1181 _arg_local.set(j); |
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1182 _arg_stack.set(j); |
0 | 1183 } |
1184 j += t->size(); | |
1185 } | |
1186 assert(j == _arg_size, "just checking"); | |
1187 | |
1188 // start with optimistic assumption | |
1189 ciType *rt = _method->return_type(); | |
1190 if (rt->is_primitive_type()) { | |
1191 _return_local = false; | |
1192 _return_allocated = false; | |
1193 } else { | |
1194 _return_local = true; | |
1195 _return_allocated = true; | |
1196 } | |
1197 _allocated_escapes = false; | |
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1198 _unknown_modified = false; |
0 | 1199 } |
1200 | |
1201 void BCEscapeAnalyzer::clear_escape_info() { | |
1202 ciSignature* sig = method()->signature(); | |
1203 int arg_count = sig->count(); | |
1204 ArgumentMap var; | |
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1205 if (!method()->is_static()) { |
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1206 arg_count++; // allow for "this" |
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1207 } |
0 | 1208 for (int i = 0; i < arg_count; i++) { |
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1209 set_arg_modified(i, OFFSET_ANY, 4); |
0 | 1210 var.clear(); |
1211 var.set(i); | |
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1212 set_modified(var, OFFSET_ANY, 4); |
0 | 1213 set_global_escape(var); |
1214 } | |
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1215 _arg_local.Clear(); |
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1216 _arg_stack.Clear(); |
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1217 _arg_returned.Clear(); |
0 | 1218 _return_local = false; |
1219 _return_allocated = false; | |
1220 _allocated_escapes = true; | |
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1221 _unknown_modified = true; |
0 | 1222 } |
1223 | |
1224 | |
1225 void BCEscapeAnalyzer::compute_escape_info() { | |
1226 int i; | |
1227 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
1228 | |
1229 vmIntrinsics::ID iid = known_intrinsic(); | |
1230 | |
1231 // check if method can be analyzed | |
1232 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
1233 || _level > MaxBCEAEstimateLevel | |
1234 || method()->code_size() > MaxBCEAEstimateSize)) { | |
1235 if (BCEATraceLevel >= 1) { | |
1236 tty->print("Skipping method because: "); | |
1237 if (method()->is_abstract()) | |
1238 tty->print_cr("method is abstract."); | |
1239 else if (method()->is_native()) | |
1240 tty->print_cr("method is native."); | |
1241 else if (!method()->holder()->is_initialized()) | |
1242 tty->print_cr("class of method is not initialized."); | |
1243 else if (_level > MaxBCEAEstimateLevel) | |
1244 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
1245 _level, MaxBCEAEstimateLevel); | |
1246 else if (method()->code_size() > MaxBCEAEstimateSize) | |
1247 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
1248 method()->code_size(), MaxBCEAEstimateSize); | |
1249 else | |
1250 ShouldNotReachHere(); | |
1251 } | |
1252 clear_escape_info(); | |
1253 | |
1254 return; | |
1255 } | |
1256 | |
1257 if (BCEATraceLevel >= 1) { | |
1258 tty->print("[EA] estimating escape information for"); | |
1259 if (iid != vmIntrinsics::_none) | |
1260 tty->print(" intrinsic"); | |
1261 method()->print_short_name(); | |
1262 tty->print_cr(" (%d bytes)", method()->code_size()); | |
1263 } | |
1264 | |
1265 bool success; | |
1266 | |
1267 initialize(); | |
1268 | |
78
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1269 // Do not scan method if it has no object parameters and |
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1270 // does not returns an object (_return_allocated is set in initialize()). |
1648
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1271 if (_arg_local.Size() == 0 && !_return_allocated) { |
78
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1272 // Clear all info since method's bytecode was not analysed and |
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1273 // set pessimistic escape information. |
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1274 clear_escape_info(); |
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1275 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1276 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
0 | 1277 methodData()->set_eflag(methodDataOopDesc::estimated); |
1278 return; | |
1279 } | |
1280 | |
1281 if (iid != vmIntrinsics::_none) | |
1282 success = compute_escape_for_intrinsic(iid); | |
1283 else { | |
1284 success = do_analysis(); | |
1285 } | |
1286 | |
78
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1287 // don't store interprocedural escape information if it introduces |
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1288 // dependencies or if method data is empty |
0 | 1289 // |
1290 if (!has_dependencies() && !methodData()->is_empty()) { | |
1291 for (i = 0; i < _arg_size; i++) { | |
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1292 if (_arg_local.test(i)) { |
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1293 assert(_arg_stack.test(i), "inconsistent escape info"); |
0 | 1294 methodData()->set_arg_local(i); |
1295 methodData()->set_arg_stack(i); | |
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1296 } else if (_arg_stack.test(i)) { |
0 | 1297 methodData()->set_arg_stack(i); |
1298 } | |
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1299 if (_arg_returned.test(i)) { |
0 | 1300 methodData()->set_arg_returned(i); |
1301 } | |
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1302 methodData()->set_arg_modified(i, _arg_modified[i]); |
0 | 1303 } |
1304 if (_return_local) { | |
1305 methodData()->set_eflag(methodDataOopDesc::return_local); | |
1306 } | |
78
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1307 if (_return_allocated) { |
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1308 methodData()->set_eflag(methodDataOopDesc::return_allocated); |
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1309 } |
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1310 if (_allocated_escapes) { |
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1311 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1312 } |
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1313 if (_unknown_modified) { |
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1314 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
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1315 } |
0 | 1316 methodData()->set_eflag(methodDataOopDesc::estimated); |
1317 } | |
1318 } | |
1319 | |
1320 void BCEscapeAnalyzer::read_escape_info() { | |
1321 assert(methodData()->has_escape_info(), "no escape info available"); | |
1322 | |
1323 // read escape information from method descriptor | |
1324 for (int i = 0; i < _arg_size; i++) { | |
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1325 if (methodData()->is_arg_local(i)) |
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1326 _arg_local.set(i); |
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1327 if (methodData()->is_arg_stack(i)) |
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1328 _arg_stack.set(i); |
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1329 if (methodData()->is_arg_returned(i)) |
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1330 _arg_returned.set(i); |
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1331 _arg_modified[i] = methodData()->arg_modified(i); |
0 | 1332 } |
1333 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
78
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1334 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated); |
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1335 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes); |
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1336 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified); |
0 | 1337 |
1338 } | |
1339 | |
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1340 #ifndef PRODUCT |
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1341 void BCEscapeAnalyzer::dump() { |
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1342 tty->print("[EA] estimated escape information for"); |
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1343 method()->print_short_name(); |
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1344 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1345 tty->print(" non-escaping args: "); |
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1346 _arg_local.print_on(tty); |
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1347 tty->print(" stack-allocatable args: "); |
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1348 _arg_stack.print_on(tty); |
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1349 if (_return_local) { |
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1350 tty->print(" returned args: "); |
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1351 _arg_returned.print_on(tty); |
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1352 } else if (is_return_allocated()) { |
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1353 tty->print_cr(" return allocated value"); |
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1354 } else { |
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1355 tty->print_cr(" return non-local value"); |
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1356 } |
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1357 tty->print(" modified args: "); |
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1358 for (int i = 0; i < _arg_size; i++) { |
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1359 if (_arg_modified[i] == 0) |
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1360 tty->print(" 0"); |
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1361 else |
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1362 tty->print(" 0x%x", _arg_modified[i]); |
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1363 } |
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1364 tty->cr(); |
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1365 tty->print(" flags: "); |
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1366 if (_return_allocated) |
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1367 tty->print(" return_allocated"); |
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1368 if (_allocated_escapes) |
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1369 tty->print(" allocated_escapes"); |
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1370 if (_unknown_modified) |
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1371 tty->print(" unknown_modified"); |
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1372 tty->cr(); |
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1373 } |
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1374 #endif |
0 | 1375 |
1376 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
1377 : _conservative(method == NULL || !EstimateArgEscape) | |
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1378 , _arena(CURRENT_ENV->arena()) |
0 | 1379 , _method(method) |
1380 , _methodData(method ? method->method_data() : NULL) | |
1381 , _arg_size(method ? method->arg_size() : 0) | |
1648
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1382 , _arg_local(_arena) |
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1383 , _arg_stack(_arena) |
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1384 , _arg_returned(_arena) |
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1385 , _dirty(_arena) |
0 | 1386 , _return_local(false) |
1387 , _return_allocated(false) | |
1388 , _allocated_escapes(false) | |
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1389 , _unknown_modified(false) |
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1390 , _dependencies(_arena, 4, 0, NULL) |
0 | 1391 , _parent(parent) |
1392 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
1393 if (!_conservative) { | |
1648
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1394 _arg_local.Clear(); |
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1395 _arg_stack.Clear(); |
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1396 _arg_returned.Clear(); |
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1397 _dirty.Clear(); |
0 | 1398 Arena* arena = CURRENT_ENV->arena(); |
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1399 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1400 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
0 | 1401 |
1402 if (methodData() == NULL) | |
1403 return; | |
1404 bool printit = _method->should_print_assembly(); | |
1405 if (methodData()->has_escape_info()) { | |
1406 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
1407 method->holder()->name()->as_utf8(), | |
1408 method->name()->as_utf8())); | |
1409 read_escape_info(); | |
1410 } else { | |
1411 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
1412 method->holder()->name()->as_utf8(), | |
1413 method->name()->as_utf8())); | |
1414 | |
1415 compute_escape_info(); | |
1416 methodData()->update_escape_info(); | |
1417 } | |
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1418 #ifndef PRODUCT |
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1419 if (BCEATraceLevel >= 3) { |
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1420 // dump escape information |
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1421 dump(); |
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1422 } |
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1423 #endif |
0 | 1424 } |
1425 } | |
1426 | |
1427 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
1397
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1428 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
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1429 // Also record evol dependencies so redefinition of the |
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1430 // callee will trigger recompilation. |
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1431 deps->assert_evol_method(method()); |
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1432 } |
0 | 1433 for (int i = 0; i < _dependencies.length(); i+=2) { |
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1434 ciKlass *k = _dependencies.at(i)->as_klass(); |
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1435 ciMethod *m = _dependencies.at(i+1)->as_method(); |
0 | 1436 deps->assert_unique_concrete_method(k, m); |
1437 } | |
1438 } |