Mercurial > hg > graal-compiler
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 1766:02f0a9b6f654
6969586: OptimizeStringConcat: SIGSEGV in LoadNode::Value()
Reviewed-by: kvn
author | never |
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date | Mon, 30 Aug 2010 17:27:35 -0700 |
parents | 53dbe853fb3a |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2009, 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 | |
25 | |
26 #include "incls/_precompiled.incl" | |
27 #include "incls/_bcEscapeAnalyzer.cpp.incl" | |
28 | |
29 | |
30 #ifndef PRODUCT | |
31 #define TRACE_BCEA(level, code) \ | |
32 if (EstimateArgEscape && BCEATraceLevel >= level) { \ | |
33 code; \ | |
34 } | |
35 #else | |
36 #define TRACE_BCEA(level, code) | |
37 #endif | |
38 | |
39 // Maintain a map of which aguments a local variable or | |
40 // stack slot may contain. In addition to tracking | |
41 // arguments, it tracks two special values, "allocated" | |
42 // which represents any object allocated in the current | |
43 // method, and "unknown" which is any other object. | |
44 // Up to 30 arguments are handled, with the last one | |
45 // representing summary information for any extra arguments | |
46 class BCEscapeAnalyzer::ArgumentMap { | |
47 uint _bits; | |
48 enum {MAXBIT = 29, | |
49 ALLOCATED = 1, | |
50 UNKNOWN = 2}; | |
51 | |
52 uint int_to_bit(uint e) const { | |
53 if (e > MAXBIT) | |
54 e = MAXBIT; | |
55 return (1 << (e + 2)); | |
56 } | |
57 | |
58 public: | |
59 ArgumentMap() { _bits = 0;} | |
60 void set_bits(uint bits) { _bits = bits;} | |
61 uint get_bits() const { return _bits;} | |
62 void clear() { _bits = 0;} | |
63 void set_all() { _bits = ~0u; } | |
64 bool is_empty() const { return _bits == 0; } | |
65 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } | |
66 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } | |
67 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } | |
68 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } | |
69 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } | |
70 void set(uint var) { _bits = int_to_bit(var); } | |
71 void add(uint var) { _bits |= int_to_bit(var); } | |
72 void add_unknown() { _bits = UNKNOWN; } | |
73 void add_allocated() { _bits = ALLOCATED; } | |
74 void set_union(const ArgumentMap &am) { _bits |= am._bits; } | |
75 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } | |
76 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } | |
77 void operator=(const ArgumentMap &am) { _bits = am._bits; } | |
78 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } | |
79 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } | |
80 }; | |
81 | |
82 class BCEscapeAnalyzer::StateInfo { | |
83 public: | |
84 ArgumentMap *_vars; | |
85 ArgumentMap *_stack; | |
86 short _stack_height; | |
87 short _max_stack; | |
88 bool _initialized; | |
89 ArgumentMap empty_map; | |
90 | |
91 StateInfo() { | |
92 empty_map.clear(); | |
93 } | |
94 | |
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95 ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } |
0 | 96 ArgumentMap apop() { return raw_pop(); } |
97 void spop() { raw_pop(); } | |
98 void lpop() { spop(); spop(); } | |
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99 void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } |
0 | 100 void apush(ArgumentMap i) { raw_push(i); } |
101 void spush() { raw_push(empty_map); } | |
102 void lpush() { spush(); spush(); } | |
103 | |
104 }; | |
105 | |
106 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { | |
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107 for (int i = 0; i < _arg_size; i++) { |
0 | 108 if (vars.contains(i)) |
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109 _arg_returned.set(i); |
0 | 110 } |
111 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); | |
112 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); | |
113 } | |
114 | |
115 // return true if any element of vars is an argument | |
116 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { | |
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117 for (int i = 0; i < _arg_size; i++) { |
0 | 118 if (vars.contains(i)) |
119 return true; | |
120 } | |
121 return false; | |
122 } | |
123 | |
124 // return true if any element of vars is an arg_stack argument | |
125 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ | |
126 if (_conservative) | |
127 return true; | |
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128 for (int i = 0; i < _arg_size; i++) { |
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129 if (vars.contains(i) && _arg_stack.test(i)) |
0 | 130 return true; |
131 } | |
132 return false; | |
133 } | |
134 | |
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135 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { |
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136 for (int i = 0; i < _arg_size; i++) { |
0 | 137 if (vars.contains(i)) { |
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138 bm >>= i; |
0 | 139 } |
140 } | |
141 } | |
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142 |
0 | 143 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { |
144 clear_bits(vars, _arg_local); | |
145 } | |
146 | |
147 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars) { | |
148 clear_bits(vars, _arg_local); | |
149 clear_bits(vars, _arg_stack); | |
150 if (vars.contains_allocated()) | |
151 _allocated_escapes = true; | |
152 } | |
153 | |
154 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
155 clear_bits(vars, _dirty); | |
156 } | |
157 | |
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158 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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159 |
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160 for (int i = 0; i < _arg_size; i++) { |
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161 if (vars.contains(i)) { |
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162 set_arg_modified(i, offs, size); |
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163 } |
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164 } |
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165 if (vars.contains_unknown()) |
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166 _unknown_modified = true; |
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167 } |
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168 |
0 | 169 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
170 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
171 if (scope->method() == callee) { | |
172 return true; | |
173 } | |
174 } | |
175 return false; | |
176 } | |
177 | |
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178 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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179 if (offset == OFFSET_ANY) |
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180 return _arg_modified[arg] != 0; |
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181 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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182 bool modified = false; |
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183 int l = offset / HeapWordSize; |
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184 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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185 if (l > ARG_OFFSET_MAX) |
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186 l = ARG_OFFSET_MAX; |
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187 if (h > ARG_OFFSET_MAX+1) |
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188 h = ARG_OFFSET_MAX + 1; |
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189 for (int i = l; i < h; i++) { |
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190 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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191 } |
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192 return modified; |
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193 } |
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194 |
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195 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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196 if (offset == OFFSET_ANY) { |
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197 _arg_modified[arg] = (uint) -1; |
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198 return; |
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199 } |
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200 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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201 int l = offset / HeapWordSize; |
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202 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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203 if (l > ARG_OFFSET_MAX) |
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204 l = ARG_OFFSET_MAX; |
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205 if (h > ARG_OFFSET_MAX+1) |
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206 h = ARG_OFFSET_MAX + 1; |
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207 for (int i = l; i < h; i++) { |
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208 _arg_modified[arg] |= (1 << i); |
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209 } |
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210 } |
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211 |
0 | 212 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
213 int i; | |
214 | |
215 // retrieve information about the callee | |
216 ciInstanceKlass* klass = target->holder(); | |
217 ciInstanceKlass* calling_klass = method()->holder(); | |
218 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
219 ciInstanceKlass* actual_recv = callee_holder; | |
220 | |
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221 // some methods are obviously bindable without any type checks so |
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222 // convert them directly to an invokespecial. |
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223 if (target->is_loaded() && !target->is_abstract() && |
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224 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) { |
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225 code = Bytecodes::_invokespecial; |
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226 } |
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227 |
0 | 228 // compute size of arguments |
229 int arg_size = target->arg_size(); | |
230 if (!target->is_loaded() && code == Bytecodes::_invokestatic) { | |
231 arg_size--; | |
232 } | |
233 int arg_base = MAX2(state._stack_height - arg_size, 0); | |
234 | |
235 // direct recursive calls are skipped if they can be bound statically without introducing | |
236 // dependencies and if parameters are passed at the same position as in the current method | |
237 // other calls are skipped if there are no unescaped arguments passed to them | |
238 bool directly_recursive = (method() == target) && | |
239 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
240 | |
241 // check if analysis of callee can safely be skipped | |
242 bool skip_callee = true; | |
243 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
244 ArgumentMap arg = state._stack[i]; | |
245 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
246 } | |
247 if (skip_callee) { | |
248 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
249 for (i = 0; i < arg_size; i++) { | |
250 set_method_escape(state.raw_pop()); | |
251 } | |
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252 _unknown_modified = true; // assume the worst since we don't analyze the called method |
0 | 253 return; |
254 } | |
255 | |
256 // determine actual method (use CHA if necessary) | |
257 ciMethod* inline_target = NULL; | |
258 if (target->is_loaded() && klass->is_loaded() | |
259 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
260 && target->will_link(klass, callee_holder, code)) { | |
261 if (code == Bytecodes::_invokestatic | |
262 || code == Bytecodes::_invokespecial | |
263 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
264 inline_target = target; | |
265 } else { | |
266 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
267 } | |
268 } | |
269 | |
270 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
271 // analyze callee | |
272 BCEscapeAnalyzer analyzer(inline_target, this); | |
273 | |
274 // adjust escape state of actual parameters | |
275 bool must_record_dependencies = false; | |
276 for (i = arg_size - 1; i >= 0; i--) { | |
277 ArgumentMap arg = state.raw_pop(); | |
278 if (!is_argument(arg)) | |
279 continue; | |
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280 for (int j = 0; j < _arg_size; j++) { |
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281 if (arg.contains(j)) { |
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282 _arg_modified[j] |= analyzer._arg_modified[i]; |
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283 } |
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284 } |
0 | 285 if (!is_arg_stack(arg)) { |
286 // arguments have already been recognized as escaping | |
287 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
288 set_method_escape(arg); | |
289 must_record_dependencies = true; | |
290 } else { | |
291 set_global_escape(arg); | |
292 } | |
293 } | |
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294 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
0 | 295 |
296 // record dependencies if at least one parameter retained stack-allocatable | |
297 if (must_record_dependencies) { | |
298 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
299 _dependencies.append(actual_recv); | |
300 _dependencies.append(inline_target); | |
301 } | |
302 _dependencies.appendAll(analyzer.dependencies()); | |
303 } | |
304 } else { | |
305 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
306 target->name()->as_utf8())); | |
307 // conservatively mark all actual parameters as escaping globally | |
308 for (i = 0; i < arg_size; i++) { | |
309 ArgumentMap arg = state.raw_pop(); | |
310 if (!is_argument(arg)) | |
311 continue; | |
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312 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 313 set_global_escape(arg); |
314 } | |
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315 _unknown_modified = true; // assume the worst since we don't know the called method |
0 | 316 } |
317 } | |
318 | |
319 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
320 return ((~arg_set1) | arg_set2) == 0; | |
321 } | |
322 | |
323 | |
324 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
325 | |
326 blk->set_processed(); | |
327 ciBytecodeStream s(method()); | |
328 int limit_bci = blk->limit_bci(); | |
329 bool fall_through = false; | |
330 ArgumentMap allocated_obj; | |
331 allocated_obj.add_allocated(); | |
332 ArgumentMap unknown_obj; | |
333 unknown_obj.add_unknown(); | |
334 ArgumentMap empty_map; | |
335 | |
336 s.reset_to_bci(blk->start_bci()); | |
337 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
338 fall_through = true; | |
339 switch (s.cur_bc()) { | |
340 case Bytecodes::_nop: | |
341 break; | |
342 case Bytecodes::_aconst_null: | |
343 state.apush(empty_map); | |
344 break; | |
345 case Bytecodes::_iconst_m1: | |
346 case Bytecodes::_iconst_0: | |
347 case Bytecodes::_iconst_1: | |
348 case Bytecodes::_iconst_2: | |
349 case Bytecodes::_iconst_3: | |
350 case Bytecodes::_iconst_4: | |
351 case Bytecodes::_iconst_5: | |
352 case Bytecodes::_fconst_0: | |
353 case Bytecodes::_fconst_1: | |
354 case Bytecodes::_fconst_2: | |
355 case Bytecodes::_bipush: | |
356 case Bytecodes::_sipush: | |
357 state.spush(); | |
358 break; | |
359 case Bytecodes::_lconst_0: | |
360 case Bytecodes::_lconst_1: | |
361 case Bytecodes::_dconst_0: | |
362 case Bytecodes::_dconst_1: | |
363 state.lpush(); | |
364 break; | |
365 case Bytecodes::_ldc: | |
366 case Bytecodes::_ldc_w: | |
367 case Bytecodes::_ldc2_w: | |
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368 { |
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369 // Avoid calling get_constant() which will try to allocate |
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370 // unloaded constant. We need only constant's type. |
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371 int index = s.get_constant_pool_index(); |
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372 constantTag tag = s.get_constant_pool_tag(index); |
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373 if (tag.is_long() || tag.is_double()) { |
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374 // Only longs and doubles use 2 stack slots. |
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375 state.lpush(); |
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376 } else { |
0 | 377 state.spush(); |
378 } | |
379 break; | |
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380 } |
0 | 381 case Bytecodes::_aload: |
382 state.apush(state._vars[s.get_index()]); | |
383 break; | |
384 case Bytecodes::_iload: | |
385 case Bytecodes::_fload: | |
386 case Bytecodes::_iload_0: | |
387 case Bytecodes::_iload_1: | |
388 case Bytecodes::_iload_2: | |
389 case Bytecodes::_iload_3: | |
390 case Bytecodes::_fload_0: | |
391 case Bytecodes::_fload_1: | |
392 case Bytecodes::_fload_2: | |
393 case Bytecodes::_fload_3: | |
394 state.spush(); | |
395 break; | |
396 case Bytecodes::_lload: | |
397 case Bytecodes::_dload: | |
398 case Bytecodes::_lload_0: | |
399 case Bytecodes::_lload_1: | |
400 case Bytecodes::_lload_2: | |
401 case Bytecodes::_lload_3: | |
402 case Bytecodes::_dload_0: | |
403 case Bytecodes::_dload_1: | |
404 case Bytecodes::_dload_2: | |
405 case Bytecodes::_dload_3: | |
406 state.lpush(); | |
407 break; | |
408 case Bytecodes::_aload_0: | |
409 state.apush(state._vars[0]); | |
410 break; | |
411 case Bytecodes::_aload_1: | |
412 state.apush(state._vars[1]); | |
413 break; | |
414 case Bytecodes::_aload_2: | |
415 state.apush(state._vars[2]); | |
416 break; | |
417 case Bytecodes::_aload_3: | |
418 state.apush(state._vars[3]); | |
419 break; | |
420 case Bytecodes::_iaload: | |
421 case Bytecodes::_faload: | |
422 case Bytecodes::_baload: | |
423 case Bytecodes::_caload: | |
424 case Bytecodes::_saload: | |
425 state.spop(); | |
426 set_method_escape(state.apop()); | |
427 state.spush(); | |
428 break; | |
429 case Bytecodes::_laload: | |
430 case Bytecodes::_daload: | |
431 state.spop(); | |
432 set_method_escape(state.apop()); | |
433 state.lpush(); | |
434 break; | |
435 case Bytecodes::_aaload: | |
436 { state.spop(); | |
437 ArgumentMap array = state.apop(); | |
438 set_method_escape(array); | |
439 state.apush(unknown_obj); | |
440 set_dirty(array); | |
441 } | |
442 break; | |
443 case Bytecodes::_istore: | |
444 case Bytecodes::_fstore: | |
445 case Bytecodes::_istore_0: | |
446 case Bytecodes::_istore_1: | |
447 case Bytecodes::_istore_2: | |
448 case Bytecodes::_istore_3: | |
449 case Bytecodes::_fstore_0: | |
450 case Bytecodes::_fstore_1: | |
451 case Bytecodes::_fstore_2: | |
452 case Bytecodes::_fstore_3: | |
453 state.spop(); | |
454 break; | |
455 case Bytecodes::_lstore: | |
456 case Bytecodes::_dstore: | |
457 case Bytecodes::_lstore_0: | |
458 case Bytecodes::_lstore_1: | |
459 case Bytecodes::_lstore_2: | |
460 case Bytecodes::_lstore_3: | |
461 case Bytecodes::_dstore_0: | |
462 case Bytecodes::_dstore_1: | |
463 case Bytecodes::_dstore_2: | |
464 case Bytecodes::_dstore_3: | |
465 state.lpop(); | |
466 break; | |
467 case Bytecodes::_astore: | |
468 state._vars[s.get_index()] = state.apop(); | |
469 break; | |
470 case Bytecodes::_astore_0: | |
471 state._vars[0] = state.apop(); | |
472 break; | |
473 case Bytecodes::_astore_1: | |
474 state._vars[1] = state.apop(); | |
475 break; | |
476 case Bytecodes::_astore_2: | |
477 state._vars[2] = state.apop(); | |
478 break; | |
479 case Bytecodes::_astore_3: | |
480 state._vars[3] = state.apop(); | |
481 break; | |
482 case Bytecodes::_iastore: | |
483 case Bytecodes::_fastore: | |
484 case Bytecodes::_bastore: | |
485 case Bytecodes::_castore: | |
486 case Bytecodes::_sastore: | |
487 { | |
488 state.spop(); | |
489 state.spop(); | |
490 ArgumentMap arr = state.apop(); | |
491 set_method_escape(arr); | |
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492 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 493 break; |
494 } | |
495 case Bytecodes::_lastore: | |
496 case Bytecodes::_dastore: | |
497 { | |
498 state.lpop(); | |
499 state.spop(); | |
500 ArgumentMap arr = state.apop(); | |
501 set_method_escape(arr); | |
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502 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
0 | 503 break; |
504 } | |
505 case Bytecodes::_aastore: | |
506 { | |
507 set_global_escape(state.apop()); | |
508 state.spop(); | |
509 ArgumentMap arr = state.apop(); | |
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510 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
0 | 511 break; |
512 } | |
513 case Bytecodes::_pop: | |
514 state.raw_pop(); | |
515 break; | |
516 case Bytecodes::_pop2: | |
517 state.raw_pop(); | |
518 state.raw_pop(); | |
519 break; | |
520 case Bytecodes::_dup: | |
521 { ArgumentMap w1 = state.raw_pop(); | |
522 state.raw_push(w1); | |
523 state.raw_push(w1); | |
524 } | |
525 break; | |
526 case Bytecodes::_dup_x1: | |
527 { ArgumentMap w1 = state.raw_pop(); | |
528 ArgumentMap w2 = state.raw_pop(); | |
529 state.raw_push(w1); | |
530 state.raw_push(w2); | |
531 state.raw_push(w1); | |
532 } | |
533 break; | |
534 case Bytecodes::_dup_x2: | |
535 { ArgumentMap w1 = state.raw_pop(); | |
536 ArgumentMap w2 = state.raw_pop(); | |
537 ArgumentMap w3 = state.raw_pop(); | |
538 state.raw_push(w1); | |
539 state.raw_push(w3); | |
540 state.raw_push(w2); | |
541 state.raw_push(w1); | |
542 } | |
543 break; | |
544 case Bytecodes::_dup2: | |
545 { ArgumentMap w1 = state.raw_pop(); | |
546 ArgumentMap w2 = state.raw_pop(); | |
547 state.raw_push(w2); | |
548 state.raw_push(w1); | |
549 state.raw_push(w2); | |
550 state.raw_push(w1); | |
551 } | |
552 break; | |
553 case Bytecodes::_dup2_x1: | |
554 { ArgumentMap w1 = state.raw_pop(); | |
555 ArgumentMap w2 = state.raw_pop(); | |
556 ArgumentMap w3 = state.raw_pop(); | |
557 state.raw_push(w2); | |
558 state.raw_push(w1); | |
559 state.raw_push(w3); | |
560 state.raw_push(w2); | |
561 state.raw_push(w1); | |
562 } | |
563 break; | |
564 case Bytecodes::_dup2_x2: | |
565 { ArgumentMap w1 = state.raw_pop(); | |
566 ArgumentMap w2 = state.raw_pop(); | |
567 ArgumentMap w3 = state.raw_pop(); | |
568 ArgumentMap w4 = state.raw_pop(); | |
569 state.raw_push(w2); | |
570 state.raw_push(w1); | |
571 state.raw_push(w4); | |
572 state.raw_push(w3); | |
573 state.raw_push(w2); | |
574 state.raw_push(w1); | |
575 } | |
576 break; | |
577 case Bytecodes::_swap: | |
578 { ArgumentMap w1 = state.raw_pop(); | |
579 ArgumentMap w2 = state.raw_pop(); | |
580 state.raw_push(w1); | |
581 state.raw_push(w2); | |
582 } | |
583 break; | |
584 case Bytecodes::_iadd: | |
585 case Bytecodes::_fadd: | |
586 case Bytecodes::_isub: | |
587 case Bytecodes::_fsub: | |
588 case Bytecodes::_imul: | |
589 case Bytecodes::_fmul: | |
590 case Bytecodes::_idiv: | |
591 case Bytecodes::_fdiv: | |
592 case Bytecodes::_irem: | |
593 case Bytecodes::_frem: | |
594 case Bytecodes::_iand: | |
595 case Bytecodes::_ior: | |
596 case Bytecodes::_ixor: | |
597 state.spop(); | |
598 state.spop(); | |
599 state.spush(); | |
600 break; | |
601 case Bytecodes::_ladd: | |
602 case Bytecodes::_dadd: | |
603 case Bytecodes::_lsub: | |
604 case Bytecodes::_dsub: | |
605 case Bytecodes::_lmul: | |
606 case Bytecodes::_dmul: | |
607 case Bytecodes::_ldiv: | |
608 case Bytecodes::_ddiv: | |
609 case Bytecodes::_lrem: | |
610 case Bytecodes::_drem: | |
611 case Bytecodes::_land: | |
612 case Bytecodes::_lor: | |
613 case Bytecodes::_lxor: | |
614 state.lpop(); | |
615 state.lpop(); | |
616 state.lpush(); | |
617 break; | |
618 case Bytecodes::_ishl: | |
619 case Bytecodes::_ishr: | |
620 case Bytecodes::_iushr: | |
621 state.spop(); | |
622 state.spop(); | |
623 state.spush(); | |
624 break; | |
625 case Bytecodes::_lshl: | |
626 case Bytecodes::_lshr: | |
627 case Bytecodes::_lushr: | |
628 state.spop(); | |
629 state.lpop(); | |
630 state.lpush(); | |
631 break; | |
632 case Bytecodes::_ineg: | |
633 case Bytecodes::_fneg: | |
634 state.spop(); | |
635 state.spush(); | |
636 break; | |
637 case Bytecodes::_lneg: | |
638 case Bytecodes::_dneg: | |
639 state.lpop(); | |
640 state.lpush(); | |
641 break; | |
642 case Bytecodes::_iinc: | |
643 break; | |
644 case Bytecodes::_i2l: | |
645 case Bytecodes::_i2d: | |
646 case Bytecodes::_f2l: | |
647 case Bytecodes::_f2d: | |
648 state.spop(); | |
649 state.lpush(); | |
650 break; | |
651 case Bytecodes::_i2f: | |
652 case Bytecodes::_f2i: | |
653 state.spop(); | |
654 state.spush(); | |
655 break; | |
656 case Bytecodes::_l2i: | |
657 case Bytecodes::_l2f: | |
658 case Bytecodes::_d2i: | |
659 case Bytecodes::_d2f: | |
660 state.lpop(); | |
661 state.spush(); | |
662 break; | |
663 case Bytecodes::_l2d: | |
664 case Bytecodes::_d2l: | |
665 state.lpop(); | |
666 state.lpush(); | |
667 break; | |
668 case Bytecodes::_i2b: | |
669 case Bytecodes::_i2c: | |
670 case Bytecodes::_i2s: | |
671 state.spop(); | |
672 state.spush(); | |
673 break; | |
674 case Bytecodes::_lcmp: | |
675 case Bytecodes::_dcmpl: | |
676 case Bytecodes::_dcmpg: | |
677 state.lpop(); | |
678 state.lpop(); | |
679 state.spush(); | |
680 break; | |
681 case Bytecodes::_fcmpl: | |
682 case Bytecodes::_fcmpg: | |
683 state.spop(); | |
684 state.spop(); | |
685 state.spush(); | |
686 break; | |
687 case Bytecodes::_ifeq: | |
688 case Bytecodes::_ifne: | |
689 case Bytecodes::_iflt: | |
690 case Bytecodes::_ifge: | |
691 case Bytecodes::_ifgt: | |
692 case Bytecodes::_ifle: | |
693 { | |
694 state.spop(); | |
695 int dest_bci = s.get_dest(); | |
696 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
697 assert(s.next_bci() == limit_bci, "branch must end block"); | |
698 successors.push(_methodBlocks->block_containing(dest_bci)); | |
699 break; | |
700 } | |
701 case Bytecodes::_if_icmpeq: | |
702 case Bytecodes::_if_icmpne: | |
703 case Bytecodes::_if_icmplt: | |
704 case Bytecodes::_if_icmpge: | |
705 case Bytecodes::_if_icmpgt: | |
706 case Bytecodes::_if_icmple: | |
707 { | |
708 state.spop(); | |
709 state.spop(); | |
710 int dest_bci = s.get_dest(); | |
711 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
712 assert(s.next_bci() == limit_bci, "branch must end block"); | |
713 successors.push(_methodBlocks->block_containing(dest_bci)); | |
714 break; | |
715 } | |
716 case Bytecodes::_if_acmpeq: | |
717 case Bytecodes::_if_acmpne: | |
718 { | |
719 set_method_escape(state.apop()); | |
720 set_method_escape(state.apop()); | |
721 int dest_bci = s.get_dest(); | |
722 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
723 assert(s.next_bci() == limit_bci, "branch must end block"); | |
724 successors.push(_methodBlocks->block_containing(dest_bci)); | |
725 break; | |
726 } | |
727 case Bytecodes::_goto: | |
728 { | |
729 int dest_bci = s.get_dest(); | |
730 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
731 assert(s.next_bci() == limit_bci, "branch must end block"); | |
732 successors.push(_methodBlocks->block_containing(dest_bci)); | |
733 fall_through = false; | |
734 break; | |
735 } | |
736 case Bytecodes::_jsr: | |
737 { | |
738 int dest_bci = s.get_dest(); | |
739 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
740 assert(s.next_bci() == limit_bci, "branch must end block"); | |
741 state.apush(empty_map); | |
742 successors.push(_methodBlocks->block_containing(dest_bci)); | |
743 fall_through = false; | |
744 break; | |
745 } | |
746 case Bytecodes::_ret: | |
747 // we don't track the destination of a "ret" instruction | |
748 assert(s.next_bci() == limit_bci, "branch must end block"); | |
749 fall_through = false; | |
750 break; | |
751 case Bytecodes::_return: | |
752 assert(s.next_bci() == limit_bci, "return must end block"); | |
753 fall_through = false; | |
754 break; | |
755 case Bytecodes::_tableswitch: | |
756 { | |
757 state.spop(); | |
758 Bytecode_tableswitch* switch_ = Bytecode_tableswitch_at(s.cur_bcp()); | |
759 int len = switch_->length(); | |
760 int dest_bci; | |
761 for (int i = 0; i < len; i++) { | |
762 dest_bci = s.cur_bci() + switch_->dest_offset_at(i); | |
763 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
764 successors.push(_methodBlocks->block_containing(dest_bci)); | |
765 } | |
766 dest_bci = s.cur_bci() + switch_->default_offset(); | |
767 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
768 successors.push(_methodBlocks->block_containing(dest_bci)); | |
769 assert(s.next_bci() == limit_bci, "branch must end block"); | |
770 fall_through = false; | |
771 break; | |
772 } | |
773 case Bytecodes::_lookupswitch: | |
774 { | |
775 state.spop(); | |
776 Bytecode_lookupswitch* switch_ = Bytecode_lookupswitch_at(s.cur_bcp()); | |
777 int len = switch_->number_of_pairs(); | |
778 int dest_bci; | |
779 for (int i = 0; i < len; i++) { | |
780 dest_bci = s.cur_bci() + switch_->pair_at(i)->offset(); | |
781 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
782 successors.push(_methodBlocks->block_containing(dest_bci)); | |
783 } | |
784 dest_bci = s.cur_bci() + switch_->default_offset(); | |
785 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
786 successors.push(_methodBlocks->block_containing(dest_bci)); | |
787 fall_through = false; | |
788 break; | |
789 } | |
790 case Bytecodes::_ireturn: | |
791 case Bytecodes::_freturn: | |
792 state.spop(); | |
793 fall_through = false; | |
794 break; | |
795 case Bytecodes::_lreturn: | |
796 case Bytecodes::_dreturn: | |
797 state.lpop(); | |
798 fall_through = false; | |
799 break; | |
800 case Bytecodes::_areturn: | |
801 set_returned(state.apop()); | |
802 fall_through = false; | |
803 break; | |
804 case Bytecodes::_getstatic: | |
805 case Bytecodes::_getfield: | |
806 { bool will_link; | |
807 ciField* field = s.get_field(will_link); | |
808 BasicType field_type = field->type()->basic_type(); | |
809 if (s.cur_bc() != Bytecodes::_getstatic) { | |
810 set_method_escape(state.apop()); | |
811 } | |
812 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
813 state.apush(unknown_obj); | |
814 } else if (type2size[field_type] == 1) { | |
815 state.spush(); | |
816 } else { | |
817 state.lpush(); | |
818 } | |
819 } | |
820 break; | |
821 case Bytecodes::_putstatic: | |
822 case Bytecodes::_putfield: | |
823 { bool will_link; | |
824 ciField* field = s.get_field(will_link); | |
825 BasicType field_type = field->type()->basic_type(); | |
826 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
827 set_global_escape(state.apop()); | |
828 } else if (type2size[field_type] == 1) { | |
829 state.spop(); | |
830 } else { | |
831 state.lpop(); | |
832 } | |
833 if (s.cur_bc() != Bytecodes::_putstatic) { | |
834 ArgumentMap p = state.apop(); | |
835 set_method_escape(p); | |
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836 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
0 | 837 } |
838 } | |
839 break; | |
840 case Bytecodes::_invokevirtual: | |
841 case Bytecodes::_invokespecial: | |
842 case Bytecodes::_invokestatic: | |
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843 case Bytecodes::_invokedynamic: |
0 | 844 case Bytecodes::_invokeinterface: |
845 { bool will_link; | |
846 ciMethod* target = s.get_method(will_link); | |
847 ciKlass* holder = s.get_declared_method_holder(); | |
848 invoke(state, s.cur_bc(), target, holder); | |
849 ciType* return_type = target->return_type(); | |
850 if (!return_type->is_primitive_type()) { | |
851 state.apush(unknown_obj); | |
852 } else if (return_type->is_one_word()) { | |
853 state.spush(); | |
854 } else if (return_type->is_two_word()) { | |
855 state.lpush(); | |
856 } | |
857 } | |
858 break; | |
859 case Bytecodes::_new: | |
860 state.apush(allocated_obj); | |
861 break; | |
862 case Bytecodes::_newarray: | |
863 case Bytecodes::_anewarray: | |
864 state.spop(); | |
865 state.apush(allocated_obj); | |
866 break; | |
867 case Bytecodes::_multianewarray: | |
868 { int i = s.cur_bcp()[3]; | |
869 while (i-- > 0) state.spop(); | |
870 state.apush(allocated_obj); | |
871 } | |
872 break; | |
873 case Bytecodes::_arraylength: | |
874 set_method_escape(state.apop()); | |
875 state.spush(); | |
876 break; | |
877 case Bytecodes::_athrow: | |
878 set_global_escape(state.apop()); | |
879 fall_through = false; | |
880 break; | |
881 case Bytecodes::_checkcast: | |
882 { ArgumentMap obj = state.apop(); | |
883 set_method_escape(obj); | |
884 state.apush(obj); | |
885 } | |
886 break; | |
887 case Bytecodes::_instanceof: | |
888 set_method_escape(state.apop()); | |
889 state.spush(); | |
890 break; | |
891 case Bytecodes::_monitorenter: | |
892 case Bytecodes::_monitorexit: | |
893 state.apop(); | |
894 break; | |
895 case Bytecodes::_wide: | |
896 ShouldNotReachHere(); | |
897 break; | |
898 case Bytecodes::_ifnull: | |
899 case Bytecodes::_ifnonnull: | |
900 { | |
901 set_method_escape(state.apop()); | |
902 int dest_bci = s.get_dest(); | |
903 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
904 assert(s.next_bci() == limit_bci, "branch must end block"); | |
905 successors.push(_methodBlocks->block_containing(dest_bci)); | |
906 break; | |
907 } | |
908 case Bytecodes::_goto_w: | |
909 { | |
910 int dest_bci = s.get_far_dest(); | |
911 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
912 assert(s.next_bci() == limit_bci, "branch must end block"); | |
913 successors.push(_methodBlocks->block_containing(dest_bci)); | |
914 fall_through = false; | |
915 break; | |
916 } | |
917 case Bytecodes::_jsr_w: | |
918 { | |
919 int dest_bci = s.get_far_dest(); | |
920 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
921 assert(s.next_bci() == limit_bci, "branch must end block"); | |
922 state.apush(empty_map); | |
923 successors.push(_methodBlocks->block_containing(dest_bci)); | |
924 fall_through = false; | |
925 break; | |
926 } | |
927 case Bytecodes::_breakpoint: | |
928 break; | |
929 default: | |
930 ShouldNotReachHere(); | |
931 break; | |
932 } | |
933 | |
934 } | |
935 if (fall_through) { | |
936 int fall_through_bci = s.cur_bci(); | |
937 if (fall_through_bci < _method->code_size()) { | |
938 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
939 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
940 } | |
941 } | |
942 } | |
943 | |
944 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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945 StateInfo *d_state = blockstates + dest->index(); |
0 | 946 int nlocals = _method->max_locals(); |
947 | |
948 // exceptions may cause transfer of control to handlers in the middle of a | |
949 // block, so we don't merge the incoming state of exception handlers | |
950 if (dest->is_handler()) | |
951 return; | |
952 if (!d_state->_initialized ) { | |
953 // destination not initialized, just copy | |
954 for (int i = 0; i < nlocals; i++) { | |
955 d_state->_vars[i] = s_state->_vars[i]; | |
956 } | |
957 for (int i = 0; i < s_state->_stack_height; i++) { | |
958 d_state->_stack[i] = s_state->_stack[i]; | |
959 } | |
960 d_state->_stack_height = s_state->_stack_height; | |
961 d_state->_max_stack = s_state->_max_stack; | |
962 d_state->_initialized = true; | |
963 } else if (!dest->processed()) { | |
964 // we have not yet walked the bytecodes of dest, we can merge | |
965 // the states | |
966 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
967 for (int i = 0; i < nlocals; i++) { | |
968 d_state->_vars[i].set_union(s_state->_vars[i]); | |
969 } | |
970 for (int i = 0; i < s_state->_stack_height; i++) { | |
971 d_state->_stack[i].set_union(s_state->_stack[i]); | |
972 } | |
973 } else { | |
974 // the bytecodes of dest have already been processed, mark any | |
975 // arguments in the source state which are not in the dest state | |
976 // as global escape. | |
977 // Future refinement: we only need to mark these variable to the | |
978 // maximum escape of any variables in dest state | |
979 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
980 ArgumentMap extra_vars; | |
981 for (int i = 0; i < nlocals; i++) { | |
982 ArgumentMap t; | |
983 t = s_state->_vars[i]; | |
984 t.set_difference(d_state->_vars[i]); | |
985 extra_vars.set_union(t); | |
986 } | |
987 for (int i = 0; i < s_state->_stack_height; i++) { | |
988 ArgumentMap t; | |
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989 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
0 | 990 t.clear(); |
991 t = s_state->_stack[i]; | |
992 t.set_difference(d_state->_stack[i]); | |
993 extra_vars.set_union(t); | |
994 } | |
995 set_global_escape(extra_vars); | |
996 } | |
997 } | |
998 | |
999 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
1000 int numblocks = _methodBlocks->num_blocks(); | |
1001 int stkSize = _method->max_stack(); | |
1002 int numLocals = _method->max_locals(); | |
1003 StateInfo state; | |
1004 | |
1005 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
1006 int datasize = datacount * sizeof(ArgumentMap); | |
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1007 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
0 | 1008 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
1009 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
1010 ArgumentMap *dp = statedata; | |
1011 state._vars = dp; | |
1012 dp += numLocals; | |
1013 state._stack = dp; | |
1014 dp += stkSize; | |
1015 state._initialized = false; | |
1016 state._max_stack = stkSize; | |
1017 for (int i = 0; i < numblocks; i++) { | |
1018 blockstates[i]._vars = dp; | |
1019 dp += numLocals; | |
1020 blockstates[i]._stack = dp; | |
1021 dp += stkSize; | |
1022 blockstates[i]._initialized = false; | |
1023 blockstates[i]._stack_height = 0; | |
1024 blockstates[i]._max_stack = stkSize; | |
1025 } | |
1026 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
1027 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
1028 | |
1029 _methodBlocks->clear_processed(); | |
1030 | |
1031 // initialize block 0 state from method signature | |
1032 ArgumentMap allVars; // all oop arguments to method | |
1033 ciSignature* sig = method()->signature(); | |
1034 int j = 0; | |
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1035 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1036 int fb_i = first_blk->index(); |
0 | 1037 if (!method()->is_static()) { |
1038 // record information for "this" | |
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1039 blockstates[fb_i]._vars[j].set(j); |
0 | 1040 allVars.add(j); |
1041 j++; | |
1042 } | |
1043 for (int i = 0; i < sig->count(); i++) { | |
1044 ciType* t = sig->type_at(i); | |
1045 if (!t->is_primitive_type()) { | |
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1046 blockstates[fb_i]._vars[j].set(j); |
0 | 1047 allVars.add(j); |
1048 } | |
1049 j += t->size(); | |
1050 } | |
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1051 blockstates[fb_i]._initialized = true; |
0 | 1052 assert(j == _arg_size, "just checking"); |
1053 | |
1054 ArgumentMap unknown_map; | |
1055 unknown_map.add_unknown(); | |
1056 | |
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1057 worklist.push(first_blk); |
0 | 1058 while(worklist.length() > 0) { |
1059 ciBlock *blk = worklist.pop(); | |
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1060 StateInfo *blkState = blockstates + blk->index(); |
0 | 1061 if (blk->is_handler() || blk->is_ret_target()) { |
1062 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1063 // that any variable could contain any argument |
0 | 1064 for (int i = 0; i < numLocals; i++) { |
1065 state._vars[i] = allVars; | |
1066 } | |
1067 if (blk->is_handler()) { | |
1068 state._stack_height = 1; | |
1069 } else { | |
1070 state._stack_height = blkState->_stack_height; | |
1071 } | |
1072 for (int i = 0; i < state._stack_height; i++) { | |
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1073 // ??? should this be unknown_map ??? |
0 | 1074 state._stack[i] = allVars; |
1075 } | |
1076 } else { | |
1077 for (int i = 0; i < numLocals; i++) { | |
1078 state._vars[i] = blkState->_vars[i]; | |
1079 } | |
1080 for (int i = 0; i < blkState->_stack_height; i++) { | |
1081 state._stack[i] = blkState->_stack[i]; | |
1082 } | |
1083 state._stack_height = blkState->_stack_height; | |
1084 } | |
1085 iterate_one_block(blk, state, successors); | |
1086 // if this block has any exception handlers, push them | |
1087 // onto successor list | |
1088 if (blk->has_handler()) { | |
1089 DEBUG_ONLY(int handler_count = 0;) | |
1090 int blk_start = blk->start_bci(); | |
1091 int blk_end = blk->limit_bci(); | |
1092 for (int i = 0; i < numblocks; i++) { | |
1093 ciBlock *b = _methodBlocks->block(i); | |
1094 if (b->is_handler()) { | |
1095 int ex_start = b->ex_start_bci(); | |
1096 int ex_end = b->ex_limit_bci(); | |
1097 if ((ex_start >= blk_start && ex_start < blk_end) || | |
1098 (ex_end > blk_start && ex_end <= blk_end)) { | |
1099 successors.push(b); | |
1100 } | |
1101 DEBUG_ONLY(handler_count++;) | |
1102 } | |
1103 } | |
1104 assert(handler_count > 0, "must find at least one handler"); | |
1105 } | |
1106 // merge computed variable state with successors | |
1107 while(successors.length() > 0) { | |
1108 ciBlock *succ = successors.pop(); | |
1109 merge_block_states(blockstates, succ, &state); | |
1110 if (!succ->processed()) | |
1111 worklist.push(succ); | |
1112 } | |
1113 } | |
1114 } | |
1115 | |
1116 bool BCEscapeAnalyzer::do_analysis() { | |
1117 Arena* arena = CURRENT_ENV->arena(); | |
1118 // identify basic blocks | |
1119 _methodBlocks = _method->get_method_blocks(); | |
1120 | |
1121 iterate_blocks(arena); | |
1122 // TEMPORARY | |
1123 return true; | |
1124 } | |
1125 | |
1126 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
1127 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
1128 | |
1129 if (iid == vmIntrinsics::_getClass || | |
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1130 iid == vmIntrinsics::_fillInStackTrace || |
0 | 1131 iid == vmIntrinsics::_hashCode) |
1132 return iid; | |
1133 else | |
1134 return vmIntrinsics::_none; | |
1135 } | |
1136 | |
1137 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1138 ArgumentMap arg; |
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1139 arg.clear(); |
0 | 1140 switch (iid) { |
1141 case vmIntrinsics::_getClass: | |
1142 _return_local = false; | |
1143 break; | |
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1144 case vmIntrinsics::_fillInStackTrace: |
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1145 arg.set(0); // 'this' |
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1146 set_returned(arg); |
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1147 break; |
0 | 1148 case vmIntrinsics::_hashCode: |
1149 // initialized state is correct | |
1150 break; | |
1151 default: | |
1152 assert(false, "unexpected intrinsic"); | |
1153 } | |
1154 return true; | |
1155 } | |
1156 | |
1157 void BCEscapeAnalyzer::initialize() { | |
1158 int i; | |
1159 | |
1160 // clear escape information (method may have been deoptimized) | |
1161 methodData()->clear_escape_info(); | |
1162 | |
1163 // initialize escape state of object parameters | |
1164 ciSignature* sig = method()->signature(); | |
1165 int j = 0; | |
1166 if (!method()->is_static()) { | |
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1167 _arg_local.set(0); |
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1168 _arg_stack.set(0); |
0 | 1169 j++; |
1170 } | |
1171 for (i = 0; i < sig->count(); i++) { | |
1172 ciType* t = sig->type_at(i); | |
1173 if (!t->is_primitive_type()) { | |
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1174 _arg_local.set(j); |
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1175 _arg_stack.set(j); |
0 | 1176 } |
1177 j += t->size(); | |
1178 } | |
1179 assert(j == _arg_size, "just checking"); | |
1180 | |
1181 // start with optimistic assumption | |
1182 ciType *rt = _method->return_type(); | |
1183 if (rt->is_primitive_type()) { | |
1184 _return_local = false; | |
1185 _return_allocated = false; | |
1186 } else { | |
1187 _return_local = true; | |
1188 _return_allocated = true; | |
1189 } | |
1190 _allocated_escapes = false; | |
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1191 _unknown_modified = false; |
0 | 1192 } |
1193 | |
1194 void BCEscapeAnalyzer::clear_escape_info() { | |
1195 ciSignature* sig = method()->signature(); | |
1196 int arg_count = sig->count(); | |
1197 ArgumentMap var; | |
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1198 if (!method()->is_static()) { |
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1199 arg_count++; // allow for "this" |
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1200 } |
0 | 1201 for (int i = 0; i < arg_count; i++) { |
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1202 set_arg_modified(i, OFFSET_ANY, 4); |
0 | 1203 var.clear(); |
1204 var.set(i); | |
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1205 set_modified(var, OFFSET_ANY, 4); |
0 | 1206 set_global_escape(var); |
1207 } | |
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1208 _arg_local.Clear(); |
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1209 _arg_stack.Clear(); |
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1210 _arg_returned.Clear(); |
0 | 1211 _return_local = false; |
1212 _return_allocated = false; | |
1213 _allocated_escapes = true; | |
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1214 _unknown_modified = true; |
0 | 1215 } |
1216 | |
1217 | |
1218 void BCEscapeAnalyzer::compute_escape_info() { | |
1219 int i; | |
1220 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
1221 | |
1222 vmIntrinsics::ID iid = known_intrinsic(); | |
1223 | |
1224 // check if method can be analyzed | |
1225 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
1226 || _level > MaxBCEAEstimateLevel | |
1227 || method()->code_size() > MaxBCEAEstimateSize)) { | |
1228 if (BCEATraceLevel >= 1) { | |
1229 tty->print("Skipping method because: "); | |
1230 if (method()->is_abstract()) | |
1231 tty->print_cr("method is abstract."); | |
1232 else if (method()->is_native()) | |
1233 tty->print_cr("method is native."); | |
1234 else if (!method()->holder()->is_initialized()) | |
1235 tty->print_cr("class of method is not initialized."); | |
1236 else if (_level > MaxBCEAEstimateLevel) | |
1237 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
1238 _level, MaxBCEAEstimateLevel); | |
1239 else if (method()->code_size() > MaxBCEAEstimateSize) | |
1240 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
1241 method()->code_size(), MaxBCEAEstimateSize); | |
1242 else | |
1243 ShouldNotReachHere(); | |
1244 } | |
1245 clear_escape_info(); | |
1246 | |
1247 return; | |
1248 } | |
1249 | |
1250 if (BCEATraceLevel >= 1) { | |
1251 tty->print("[EA] estimating escape information for"); | |
1252 if (iid != vmIntrinsics::_none) | |
1253 tty->print(" intrinsic"); | |
1254 method()->print_short_name(); | |
1255 tty->print_cr(" (%d bytes)", method()->code_size()); | |
1256 } | |
1257 | |
1258 bool success; | |
1259 | |
1260 initialize(); | |
1261 | |
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1262 // Do not scan method if it has no object parameters and |
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1263 // does not returns an object (_return_allocated is set in initialize()). |
1648
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1264 if (_arg_local.Size() == 0 && !_return_allocated) { |
78
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1265 // Clear all info since method's bytecode was not analysed and |
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1266 // set pessimistic escape information. |
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1267 clear_escape_info(); |
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1268 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1269 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
0 | 1270 methodData()->set_eflag(methodDataOopDesc::estimated); |
1271 return; | |
1272 } | |
1273 | |
1274 if (iid != vmIntrinsics::_none) | |
1275 success = compute_escape_for_intrinsic(iid); | |
1276 else { | |
1277 success = do_analysis(); | |
1278 } | |
1279 | |
78
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1280 // don't store interprocedural escape information if it introduces |
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1281 // dependencies or if method data is empty |
0 | 1282 // |
1283 if (!has_dependencies() && !methodData()->is_empty()) { | |
1284 for (i = 0; i < _arg_size; i++) { | |
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1285 if (_arg_local.test(i)) { |
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1286 assert(_arg_stack.test(i), "inconsistent escape info"); |
0 | 1287 methodData()->set_arg_local(i); |
1288 methodData()->set_arg_stack(i); | |
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1289 } else if (_arg_stack.test(i)) { |
0 | 1290 methodData()->set_arg_stack(i); |
1291 } | |
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1292 if (_arg_returned.test(i)) { |
0 | 1293 methodData()->set_arg_returned(i); |
1294 } | |
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1295 methodData()->set_arg_modified(i, _arg_modified[i]); |
0 | 1296 } |
1297 if (_return_local) { | |
1298 methodData()->set_eflag(methodDataOopDesc::return_local); | |
1299 } | |
78
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1300 if (_return_allocated) { |
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1301 methodData()->set_eflag(methodDataOopDesc::return_allocated); |
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1302 } |
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1303 if (_allocated_escapes) { |
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1304 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1305 } |
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1306 if (_unknown_modified) { |
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1307 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
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1308 } |
0 | 1309 methodData()->set_eflag(methodDataOopDesc::estimated); |
1310 } | |
1311 } | |
1312 | |
1313 void BCEscapeAnalyzer::read_escape_info() { | |
1314 assert(methodData()->has_escape_info(), "no escape info available"); | |
1315 | |
1316 // read escape information from method descriptor | |
1317 for (int i = 0; i < _arg_size; i++) { | |
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1318 if (methodData()->is_arg_local(i)) |
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1319 _arg_local.set(i); |
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1320 if (methodData()->is_arg_stack(i)) |
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1321 _arg_stack.set(i); |
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1322 if (methodData()->is_arg_returned(i)) |
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1323 _arg_returned.set(i); |
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1324 _arg_modified[i] = methodData()->arg_modified(i); |
0 | 1325 } |
1326 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
78
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1327 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated); |
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1328 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes); |
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1329 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified); |
0 | 1330 |
1331 } | |
1332 | |
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1333 #ifndef PRODUCT |
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1334 void BCEscapeAnalyzer::dump() { |
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1335 tty->print("[EA] estimated escape information for"); |
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1336 method()->print_short_name(); |
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1337 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1338 tty->print(" non-escaping args: "); |
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1339 _arg_local.print_on(tty); |
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1340 tty->print(" stack-allocatable args: "); |
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1341 _arg_stack.print_on(tty); |
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1342 if (_return_local) { |
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1343 tty->print(" returned args: "); |
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1344 _arg_returned.print_on(tty); |
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1345 } else if (is_return_allocated()) { |
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1346 tty->print_cr(" return allocated value"); |
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1347 } else { |
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1348 tty->print_cr(" return non-local value"); |
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1349 } |
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1350 tty->print(" modified args: "); |
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1351 for (int i = 0; i < _arg_size; i++) { |
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1352 if (_arg_modified[i] == 0) |
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1353 tty->print(" 0"); |
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1354 else |
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1355 tty->print(" 0x%x", _arg_modified[i]); |
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1356 } |
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1357 tty->cr(); |
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1358 tty->print(" flags: "); |
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1359 if (_return_allocated) |
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1360 tty->print(" return_allocated"); |
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1361 if (_allocated_escapes) |
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1362 tty->print(" allocated_escapes"); |
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1363 if (_unknown_modified) |
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1364 tty->print(" unknown_modified"); |
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1365 tty->cr(); |
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1366 } |
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1367 #endif |
0 | 1368 |
1369 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
1370 : _conservative(method == NULL || !EstimateArgEscape) | |
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1371 , _arena(CURRENT_ENV->arena()) |
0 | 1372 , _method(method) |
1373 , _methodData(method ? method->method_data() : NULL) | |
1374 , _arg_size(method ? method->arg_size() : 0) | |
1648
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1375 , _arg_local(_arena) |
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1376 , _arg_stack(_arena) |
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1377 , _arg_returned(_arena) |
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1378 , _dirty(_arena) |
0 | 1379 , _return_local(false) |
1380 , _return_allocated(false) | |
1381 , _allocated_escapes(false) | |
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1382 , _unknown_modified(false) |
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1383 , _dependencies(_arena, 4, 0, NULL) |
0 | 1384 , _parent(parent) |
1385 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
1386 if (!_conservative) { | |
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1387 _arg_local.Clear(); |
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1388 _arg_stack.Clear(); |
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1389 _arg_returned.Clear(); |
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1390 _dirty.Clear(); |
0 | 1391 Arena* arena = CURRENT_ENV->arena(); |
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1392 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1393 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
0 | 1394 |
1395 if (methodData() == NULL) | |
1396 return; | |
1397 bool printit = _method->should_print_assembly(); | |
1398 if (methodData()->has_escape_info()) { | |
1399 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
1400 method->holder()->name()->as_utf8(), | |
1401 method->name()->as_utf8())); | |
1402 read_escape_info(); | |
1403 } else { | |
1404 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
1405 method->holder()->name()->as_utf8(), | |
1406 method->name()->as_utf8())); | |
1407 | |
1408 compute_escape_info(); | |
1409 methodData()->update_escape_info(); | |
1410 } | |
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1411 #ifndef PRODUCT |
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1412 if (BCEATraceLevel >= 3) { |
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1413 // dump escape information |
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1414 dump(); |
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1415 } |
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1416 #endif |
0 | 1417 } |
1418 } | |
1419 | |
1420 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
1397
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1421 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
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1422 // Also record evol dependencies so redefinition of the |
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1423 // callee will trigger recompilation. |
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1424 deps->assert_evol_method(method()); |
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1425 } |
0 | 1426 for (int i = 0; i < _dependencies.length(); i+=2) { |
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1427 ciKlass *k = _dependencies.at(i)->as_klass(); |
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1428 ciMethod *m = _dependencies.at(i+1)->as_method(); |
0 | 1429 deps->assert_unique_concrete_method(k, m); |
1430 } | |
1431 } |