Mercurial > hg > truffle
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 5073:2db1ad9dd385
rename PiNode.value to PiNode.object and UnsafeCastNode.x to UnsafeCastNode.object
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 14 Mar 2012 16:57:18 +0100 |
parents | 5ed8f599a788 |
children | 1d7922586cf6 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/bcEscapeAnalyzer.hpp" | |
27 #include "ci/ciConstant.hpp" | |
28 #include "ci/ciField.hpp" | |
29 #include "ci/ciMethodBlocks.hpp" | |
30 #include "ci/ciStreams.hpp" | |
31 #include "interpreter/bytecode.hpp" | |
32 #include "utilities/bitMap.inline.hpp" | |
0 | 33 |
34 | |
35 | |
36 #ifndef PRODUCT | |
37 #define TRACE_BCEA(level, code) \ | |
38 if (EstimateArgEscape && BCEATraceLevel >= level) { \ | |
39 code; \ | |
40 } | |
41 #else | |
42 #define TRACE_BCEA(level, code) | |
43 #endif | |
44 | |
45 // Maintain a map of which aguments a local variable or | |
46 // stack slot may contain. In addition to tracking | |
47 // arguments, it tracks two special values, "allocated" | |
48 // which represents any object allocated in the current | |
49 // method, and "unknown" which is any other object. | |
50 // Up to 30 arguments are handled, with the last one | |
51 // representing summary information for any extra arguments | |
52 class BCEscapeAnalyzer::ArgumentMap { | |
53 uint _bits; | |
54 enum {MAXBIT = 29, | |
55 ALLOCATED = 1, | |
56 UNKNOWN = 2}; | |
57 | |
58 uint int_to_bit(uint e) const { | |
59 if (e > MAXBIT) | |
60 e = MAXBIT; | |
61 return (1 << (e + 2)); | |
62 } | |
63 | |
64 public: | |
65 ArgumentMap() { _bits = 0;} | |
66 void set_bits(uint bits) { _bits = bits;} | |
67 uint get_bits() const { return _bits;} | |
68 void clear() { _bits = 0;} | |
69 void set_all() { _bits = ~0u; } | |
70 bool is_empty() const { return _bits == 0; } | |
71 bool contains(uint var) const { return (_bits & int_to_bit(var)) != 0; } | |
72 bool is_singleton(uint var) const { return (_bits == int_to_bit(var)); } | |
73 bool contains_unknown() const { return (_bits & UNKNOWN) != 0; } | |
74 bool contains_allocated() const { return (_bits & ALLOCATED) != 0; } | |
75 bool contains_vars() const { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; } | |
76 void set(uint var) { _bits = int_to_bit(var); } | |
77 void add(uint var) { _bits |= int_to_bit(var); } | |
78 void add_unknown() { _bits = UNKNOWN; } | |
79 void add_allocated() { _bits = ALLOCATED; } | |
80 void set_union(const ArgumentMap &am) { _bits |= am._bits; } | |
81 void set_intersect(const ArgumentMap &am) { _bits |= am._bits; } | |
82 void set_difference(const ArgumentMap &am) { _bits &= ~am._bits; } | |
83 void operator=(const ArgumentMap &am) { _bits = am._bits; } | |
84 bool operator==(const ArgumentMap &am) { return _bits == am._bits; } | |
85 bool operator!=(const ArgumentMap &am) { return _bits != am._bits; } | |
86 }; | |
87 | |
88 class BCEscapeAnalyzer::StateInfo { | |
89 public: | |
90 ArgumentMap *_vars; | |
91 ArgumentMap *_stack; | |
92 short _stack_height; | |
93 short _max_stack; | |
94 bool _initialized; | |
95 ArgumentMap empty_map; | |
96 | |
97 StateInfo() { | |
98 empty_map.clear(); | |
99 } | |
100 | |
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101 ArgumentMap raw_pop() { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; } |
0 | 102 ArgumentMap apop() { return raw_pop(); } |
103 void spop() { raw_pop(); } | |
104 void lpop() { spop(); spop(); } | |
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105 void raw_push(ArgumentMap i) { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; } |
0 | 106 void apush(ArgumentMap i) { raw_push(i); } |
107 void spush() { raw_push(empty_map); } | |
108 void lpush() { spush(); spush(); } | |
109 | |
110 }; | |
111 | |
112 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) { | |
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113 for (int i = 0; i < _arg_size; i++) { |
0 | 114 if (vars.contains(i)) |
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115 _arg_returned.set(i); |
0 | 116 } |
117 _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated()); | |
118 _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars()); | |
119 } | |
120 | |
121 // return true if any element of vars is an argument | |
122 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) { | |
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123 for (int i = 0; i < _arg_size; i++) { |
0 | 124 if (vars.contains(i)) |
125 return true; | |
126 } | |
127 return false; | |
128 } | |
129 | |
130 // return true if any element of vars is an arg_stack argument | |
131 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){ | |
132 if (_conservative) | |
133 return true; | |
45
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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) { |
45
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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 | |
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153 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) { |
0 | 154 clear_bits(vars, _arg_local); |
155 clear_bits(vars, _arg_stack); | |
156 if (vars.contains_allocated()) | |
157 _allocated_escapes = true; | |
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158 |
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159 if (merge && !vars.is_empty()) { |
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160 // Merge new state into already processed block. |
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161 // New state is not taken into account and |
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162 // it may invalidate set_returned() result. |
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163 if (vars.contains_unknown() || vars.contains_allocated()) { |
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164 _return_local = false; |
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165 } |
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166 if (vars.contains_unknown() || vars.contains_vars()) { |
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167 _return_allocated = false; |
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168 } |
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169 } |
0 | 170 } |
171 | |
172 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
173 clear_bits(vars, _dirty); | |
174 } | |
175 | |
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176 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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177 |
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178 for (int i = 0; i < _arg_size; i++) { |
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179 if (vars.contains(i)) { |
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180 set_arg_modified(i, offs, size); |
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181 } |
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182 } |
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183 if (vars.contains_unknown()) |
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184 _unknown_modified = true; |
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185 } |
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186 |
0 | 187 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
188 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
189 if (scope->method() == callee) { | |
190 return true; | |
191 } | |
192 } | |
193 return false; | |
194 } | |
195 | |
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196 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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197 if (offset == OFFSET_ANY) |
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198 return _arg_modified[arg] != 0; |
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199 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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200 bool modified = false; |
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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 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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209 } |
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210 return modified; |
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211 } |
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212 |
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213 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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214 if (offset == OFFSET_ANY) { |
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215 _arg_modified[arg] = (uint) -1; |
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216 return; |
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217 } |
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218 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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219 int l = offset / HeapWordSize; |
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220 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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221 if (l > ARG_OFFSET_MAX) |
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222 l = ARG_OFFSET_MAX; |
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223 if (h > ARG_OFFSET_MAX+1) |
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224 h = ARG_OFFSET_MAX + 1; |
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225 for (int i = l; i < h; i++) { |
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226 _arg_modified[arg] |= (1 << i); |
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227 } |
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228 } |
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229 |
0 | 230 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
231 int i; | |
232 | |
233 // retrieve information about the callee | |
234 ciInstanceKlass* klass = target->holder(); | |
235 ciInstanceKlass* calling_klass = method()->holder(); | |
236 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
237 ciInstanceKlass* actual_recv = callee_holder; | |
238 | |
154
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239 // some methods are obviously bindable without any type checks so |
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240 // convert them directly to an invokespecial. |
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241 if (target->is_loaded() && !target->is_abstract() && |
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242 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) { |
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243 code = Bytecodes::_invokespecial; |
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244 } |
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245 |
0 | 246 // compute size of arguments |
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247 int arg_size = target->invoke_arg_size(code); |
0 | 248 int arg_base = MAX2(state._stack_height - arg_size, 0); |
249 | |
250 // direct recursive calls are skipped if they can be bound statically without introducing | |
251 // dependencies and if parameters are passed at the same position as in the current method | |
252 // other calls are skipped if there are no unescaped arguments passed to them | |
253 bool directly_recursive = (method() == target) && | |
254 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
255 | |
256 // check if analysis of callee can safely be skipped | |
257 bool skip_callee = true; | |
258 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
259 ArgumentMap arg = state._stack[i]; | |
260 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
261 } | |
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262 // For now we conservatively skip invokedynamic. |
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263 if (code == Bytecodes::_invokedynamic) { |
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264 skip_callee = true; |
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265 } |
0 | 266 if (skip_callee) { |
267 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
268 for (i = 0; i < arg_size; i++) { | |
269 set_method_escape(state.raw_pop()); | |
270 } | |
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271 _unknown_modified = true; // assume the worst since we don't analyze the called method |
0 | 272 return; |
273 } | |
274 | |
275 // determine actual method (use CHA if necessary) | |
276 ciMethod* inline_target = NULL; | |
277 if (target->is_loaded() && klass->is_loaded() | |
278 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
279 && target->will_link(klass, callee_holder, code)) { | |
280 if (code == Bytecodes::_invokestatic | |
281 || code == Bytecodes::_invokespecial | |
282 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
283 inline_target = target; | |
284 } else { | |
285 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
286 } | |
287 } | |
288 | |
289 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
290 // analyze callee | |
291 BCEscapeAnalyzer analyzer(inline_target, this); | |
292 | |
293 // adjust escape state of actual parameters | |
294 bool must_record_dependencies = false; | |
295 for (i = arg_size - 1; i >= 0; i--) { | |
296 ArgumentMap arg = state.raw_pop(); | |
297 if (!is_argument(arg)) | |
298 continue; | |
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299 for (int j = 0; j < _arg_size; j++) { |
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300 if (arg.contains(j)) { |
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301 _arg_modified[j] |= analyzer._arg_modified[i]; |
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302 } |
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303 } |
0 | 304 if (!is_arg_stack(arg)) { |
305 // arguments have already been recognized as escaping | |
306 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
307 set_method_escape(arg); | |
308 must_record_dependencies = true; | |
309 } else { | |
310 set_global_escape(arg); | |
311 } | |
312 } | |
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313 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
0 | 314 |
315 // record dependencies if at least one parameter retained stack-allocatable | |
316 if (must_record_dependencies) { | |
317 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
318 _dependencies.append(actual_recv); | |
319 _dependencies.append(inline_target); | |
320 } | |
321 _dependencies.appendAll(analyzer.dependencies()); | |
322 } | |
323 } else { | |
324 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
325 target->name()->as_utf8())); | |
326 // conservatively mark all actual parameters as escaping globally | |
327 for (i = 0; i < arg_size; i++) { | |
328 ArgumentMap arg = state.raw_pop(); | |
329 if (!is_argument(arg)) | |
330 continue; | |
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331 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 332 set_global_escape(arg); |
333 } | |
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334 _unknown_modified = true; // assume the worst since we don't know the called method |
0 | 335 } |
336 } | |
337 | |
338 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
339 return ((~arg_set1) | arg_set2) == 0; | |
340 } | |
341 | |
342 | |
343 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
344 | |
345 blk->set_processed(); | |
346 ciBytecodeStream s(method()); | |
347 int limit_bci = blk->limit_bci(); | |
348 bool fall_through = false; | |
349 ArgumentMap allocated_obj; | |
350 allocated_obj.add_allocated(); | |
351 ArgumentMap unknown_obj; | |
352 unknown_obj.add_unknown(); | |
353 ArgumentMap empty_map; | |
354 | |
355 s.reset_to_bci(blk->start_bci()); | |
356 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
357 fall_through = true; | |
358 switch (s.cur_bc()) { | |
359 case Bytecodes::_nop: | |
360 break; | |
361 case Bytecodes::_aconst_null: | |
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362 state.apush(unknown_obj); |
0 | 363 break; |
364 case Bytecodes::_iconst_m1: | |
365 case Bytecodes::_iconst_0: | |
366 case Bytecodes::_iconst_1: | |
367 case Bytecodes::_iconst_2: | |
368 case Bytecodes::_iconst_3: | |
369 case Bytecodes::_iconst_4: | |
370 case Bytecodes::_iconst_5: | |
371 case Bytecodes::_fconst_0: | |
372 case Bytecodes::_fconst_1: | |
373 case Bytecodes::_fconst_2: | |
374 case Bytecodes::_bipush: | |
375 case Bytecodes::_sipush: | |
376 state.spush(); | |
377 break; | |
378 case Bytecodes::_lconst_0: | |
379 case Bytecodes::_lconst_1: | |
380 case Bytecodes::_dconst_0: | |
381 case Bytecodes::_dconst_1: | |
382 state.lpush(); | |
383 break; | |
384 case Bytecodes::_ldc: | |
385 case Bytecodes::_ldc_w: | |
386 case Bytecodes::_ldc2_w: | |
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387 { |
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388 // Avoid calling get_constant() which will try to allocate |
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389 // unloaded constant. We need only constant's type. |
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390 int index = s.get_constant_pool_index(); |
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391 constantTag tag = s.get_constant_pool_tag(index); |
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392 if (tag.is_long() || tag.is_double()) { |
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393 // Only longs and doubles use 2 stack slots. |
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394 state.lpush(); |
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395 } else if (tag.basic_type() == T_OBJECT) { |
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396 state.apush(unknown_obj); |
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397 } else { |
0 | 398 state.spush(); |
399 } | |
400 break; | |
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401 } |
0 | 402 case Bytecodes::_aload: |
403 state.apush(state._vars[s.get_index()]); | |
404 break; | |
405 case Bytecodes::_iload: | |
406 case Bytecodes::_fload: | |
407 case Bytecodes::_iload_0: | |
408 case Bytecodes::_iload_1: | |
409 case Bytecodes::_iload_2: | |
410 case Bytecodes::_iload_3: | |
411 case Bytecodes::_fload_0: | |
412 case Bytecodes::_fload_1: | |
413 case Bytecodes::_fload_2: | |
414 case Bytecodes::_fload_3: | |
415 state.spush(); | |
416 break; | |
417 case Bytecodes::_lload: | |
418 case Bytecodes::_dload: | |
419 case Bytecodes::_lload_0: | |
420 case Bytecodes::_lload_1: | |
421 case Bytecodes::_lload_2: | |
422 case Bytecodes::_lload_3: | |
423 case Bytecodes::_dload_0: | |
424 case Bytecodes::_dload_1: | |
425 case Bytecodes::_dload_2: | |
426 case Bytecodes::_dload_3: | |
427 state.lpush(); | |
428 break; | |
429 case Bytecodes::_aload_0: | |
430 state.apush(state._vars[0]); | |
431 break; | |
432 case Bytecodes::_aload_1: | |
433 state.apush(state._vars[1]); | |
434 break; | |
435 case Bytecodes::_aload_2: | |
436 state.apush(state._vars[2]); | |
437 break; | |
438 case Bytecodes::_aload_3: | |
439 state.apush(state._vars[3]); | |
440 break; | |
441 case Bytecodes::_iaload: | |
442 case Bytecodes::_faload: | |
443 case Bytecodes::_baload: | |
444 case Bytecodes::_caload: | |
445 case Bytecodes::_saload: | |
446 state.spop(); | |
447 set_method_escape(state.apop()); | |
448 state.spush(); | |
449 break; | |
450 case Bytecodes::_laload: | |
451 case Bytecodes::_daload: | |
452 state.spop(); | |
453 set_method_escape(state.apop()); | |
454 state.lpush(); | |
455 break; | |
456 case Bytecodes::_aaload: | |
457 { state.spop(); | |
458 ArgumentMap array = state.apop(); | |
459 set_method_escape(array); | |
460 state.apush(unknown_obj); | |
461 set_dirty(array); | |
462 } | |
463 break; | |
464 case Bytecodes::_istore: | |
465 case Bytecodes::_fstore: | |
466 case Bytecodes::_istore_0: | |
467 case Bytecodes::_istore_1: | |
468 case Bytecodes::_istore_2: | |
469 case Bytecodes::_istore_3: | |
470 case Bytecodes::_fstore_0: | |
471 case Bytecodes::_fstore_1: | |
472 case Bytecodes::_fstore_2: | |
473 case Bytecodes::_fstore_3: | |
474 state.spop(); | |
475 break; | |
476 case Bytecodes::_lstore: | |
477 case Bytecodes::_dstore: | |
478 case Bytecodes::_lstore_0: | |
479 case Bytecodes::_lstore_1: | |
480 case Bytecodes::_lstore_2: | |
481 case Bytecodes::_lstore_3: | |
482 case Bytecodes::_dstore_0: | |
483 case Bytecodes::_dstore_1: | |
484 case Bytecodes::_dstore_2: | |
485 case Bytecodes::_dstore_3: | |
486 state.lpop(); | |
487 break; | |
488 case Bytecodes::_astore: | |
489 state._vars[s.get_index()] = state.apop(); | |
490 break; | |
491 case Bytecodes::_astore_0: | |
492 state._vars[0] = state.apop(); | |
493 break; | |
494 case Bytecodes::_astore_1: | |
495 state._vars[1] = state.apop(); | |
496 break; | |
497 case Bytecodes::_astore_2: | |
498 state._vars[2] = state.apop(); | |
499 break; | |
500 case Bytecodes::_astore_3: | |
501 state._vars[3] = state.apop(); | |
502 break; | |
503 case Bytecodes::_iastore: | |
504 case Bytecodes::_fastore: | |
505 case Bytecodes::_bastore: | |
506 case Bytecodes::_castore: | |
507 case Bytecodes::_sastore: | |
508 { | |
509 state.spop(); | |
510 state.spop(); | |
511 ArgumentMap arr = state.apop(); | |
512 set_method_escape(arr); | |
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513 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 514 break; |
515 } | |
516 case Bytecodes::_lastore: | |
517 case Bytecodes::_dastore: | |
518 { | |
519 state.lpop(); | |
520 state.spop(); | |
521 ArgumentMap arr = state.apop(); | |
522 set_method_escape(arr); | |
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523 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
0 | 524 break; |
525 } | |
526 case Bytecodes::_aastore: | |
527 { | |
528 set_global_escape(state.apop()); | |
529 state.spop(); | |
530 ArgumentMap arr = state.apop(); | |
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531 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
0 | 532 break; |
533 } | |
534 case Bytecodes::_pop: | |
535 state.raw_pop(); | |
536 break; | |
537 case Bytecodes::_pop2: | |
538 state.raw_pop(); | |
539 state.raw_pop(); | |
540 break; | |
541 case Bytecodes::_dup: | |
542 { ArgumentMap w1 = state.raw_pop(); | |
543 state.raw_push(w1); | |
544 state.raw_push(w1); | |
545 } | |
546 break; | |
547 case Bytecodes::_dup_x1: | |
548 { ArgumentMap w1 = state.raw_pop(); | |
549 ArgumentMap w2 = state.raw_pop(); | |
550 state.raw_push(w1); | |
551 state.raw_push(w2); | |
552 state.raw_push(w1); | |
553 } | |
554 break; | |
555 case Bytecodes::_dup_x2: | |
556 { ArgumentMap w1 = state.raw_pop(); | |
557 ArgumentMap w2 = state.raw_pop(); | |
558 ArgumentMap w3 = state.raw_pop(); | |
559 state.raw_push(w1); | |
560 state.raw_push(w3); | |
561 state.raw_push(w2); | |
562 state.raw_push(w1); | |
563 } | |
564 break; | |
565 case Bytecodes::_dup2: | |
566 { ArgumentMap w1 = state.raw_pop(); | |
567 ArgumentMap w2 = state.raw_pop(); | |
568 state.raw_push(w2); | |
569 state.raw_push(w1); | |
570 state.raw_push(w2); | |
571 state.raw_push(w1); | |
572 } | |
573 break; | |
574 case Bytecodes::_dup2_x1: | |
575 { ArgumentMap w1 = state.raw_pop(); | |
576 ArgumentMap w2 = state.raw_pop(); | |
577 ArgumentMap w3 = state.raw_pop(); | |
578 state.raw_push(w2); | |
579 state.raw_push(w1); | |
580 state.raw_push(w3); | |
581 state.raw_push(w2); | |
582 state.raw_push(w1); | |
583 } | |
584 break; | |
585 case Bytecodes::_dup2_x2: | |
586 { ArgumentMap w1 = state.raw_pop(); | |
587 ArgumentMap w2 = state.raw_pop(); | |
588 ArgumentMap w3 = state.raw_pop(); | |
589 ArgumentMap w4 = state.raw_pop(); | |
590 state.raw_push(w2); | |
591 state.raw_push(w1); | |
592 state.raw_push(w4); | |
593 state.raw_push(w3); | |
594 state.raw_push(w2); | |
595 state.raw_push(w1); | |
596 } | |
597 break; | |
598 case Bytecodes::_swap: | |
599 { ArgumentMap w1 = state.raw_pop(); | |
600 ArgumentMap w2 = state.raw_pop(); | |
601 state.raw_push(w1); | |
602 state.raw_push(w2); | |
603 } | |
604 break; | |
605 case Bytecodes::_iadd: | |
606 case Bytecodes::_fadd: | |
607 case Bytecodes::_isub: | |
608 case Bytecodes::_fsub: | |
609 case Bytecodes::_imul: | |
610 case Bytecodes::_fmul: | |
611 case Bytecodes::_idiv: | |
612 case Bytecodes::_fdiv: | |
613 case Bytecodes::_irem: | |
614 case Bytecodes::_frem: | |
615 case Bytecodes::_iand: | |
616 case Bytecodes::_ior: | |
617 case Bytecodes::_ixor: | |
618 state.spop(); | |
619 state.spop(); | |
620 state.spush(); | |
621 break; | |
622 case Bytecodes::_ladd: | |
623 case Bytecodes::_dadd: | |
624 case Bytecodes::_lsub: | |
625 case Bytecodes::_dsub: | |
626 case Bytecodes::_lmul: | |
627 case Bytecodes::_dmul: | |
628 case Bytecodes::_ldiv: | |
629 case Bytecodes::_ddiv: | |
630 case Bytecodes::_lrem: | |
631 case Bytecodes::_drem: | |
632 case Bytecodes::_land: | |
633 case Bytecodes::_lor: | |
634 case Bytecodes::_lxor: | |
635 state.lpop(); | |
636 state.lpop(); | |
637 state.lpush(); | |
638 break; | |
639 case Bytecodes::_ishl: | |
640 case Bytecodes::_ishr: | |
641 case Bytecodes::_iushr: | |
642 state.spop(); | |
643 state.spop(); | |
644 state.spush(); | |
645 break; | |
646 case Bytecodes::_lshl: | |
647 case Bytecodes::_lshr: | |
648 case Bytecodes::_lushr: | |
649 state.spop(); | |
650 state.lpop(); | |
651 state.lpush(); | |
652 break; | |
653 case Bytecodes::_ineg: | |
654 case Bytecodes::_fneg: | |
655 state.spop(); | |
656 state.spush(); | |
657 break; | |
658 case Bytecodes::_lneg: | |
659 case Bytecodes::_dneg: | |
660 state.lpop(); | |
661 state.lpush(); | |
662 break; | |
663 case Bytecodes::_iinc: | |
664 break; | |
665 case Bytecodes::_i2l: | |
666 case Bytecodes::_i2d: | |
667 case Bytecodes::_f2l: | |
668 case Bytecodes::_f2d: | |
669 state.spop(); | |
670 state.lpush(); | |
671 break; | |
672 case Bytecodes::_i2f: | |
673 case Bytecodes::_f2i: | |
674 state.spop(); | |
675 state.spush(); | |
676 break; | |
677 case Bytecodes::_l2i: | |
678 case Bytecodes::_l2f: | |
679 case Bytecodes::_d2i: | |
680 case Bytecodes::_d2f: | |
681 state.lpop(); | |
682 state.spush(); | |
683 break; | |
684 case Bytecodes::_l2d: | |
685 case Bytecodes::_d2l: | |
686 state.lpop(); | |
687 state.lpush(); | |
688 break; | |
689 case Bytecodes::_i2b: | |
690 case Bytecodes::_i2c: | |
691 case Bytecodes::_i2s: | |
692 state.spop(); | |
693 state.spush(); | |
694 break; | |
695 case Bytecodes::_lcmp: | |
696 case Bytecodes::_dcmpl: | |
697 case Bytecodes::_dcmpg: | |
698 state.lpop(); | |
699 state.lpop(); | |
700 state.spush(); | |
701 break; | |
702 case Bytecodes::_fcmpl: | |
703 case Bytecodes::_fcmpg: | |
704 state.spop(); | |
705 state.spop(); | |
706 state.spush(); | |
707 break; | |
708 case Bytecodes::_ifeq: | |
709 case Bytecodes::_ifne: | |
710 case Bytecodes::_iflt: | |
711 case Bytecodes::_ifge: | |
712 case Bytecodes::_ifgt: | |
713 case Bytecodes::_ifle: | |
714 { | |
715 state.spop(); | |
716 int dest_bci = s.get_dest(); | |
717 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
718 assert(s.next_bci() == limit_bci, "branch must end block"); | |
719 successors.push(_methodBlocks->block_containing(dest_bci)); | |
720 break; | |
721 } | |
722 case Bytecodes::_if_icmpeq: | |
723 case Bytecodes::_if_icmpne: | |
724 case Bytecodes::_if_icmplt: | |
725 case Bytecodes::_if_icmpge: | |
726 case Bytecodes::_if_icmpgt: | |
727 case Bytecodes::_if_icmple: | |
728 { | |
729 state.spop(); | |
730 state.spop(); | |
731 int dest_bci = s.get_dest(); | |
732 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
733 assert(s.next_bci() == limit_bci, "branch must end block"); | |
734 successors.push(_methodBlocks->block_containing(dest_bci)); | |
735 break; | |
736 } | |
737 case Bytecodes::_if_acmpeq: | |
738 case Bytecodes::_if_acmpne: | |
739 { | |
740 set_method_escape(state.apop()); | |
741 set_method_escape(state.apop()); | |
742 int dest_bci = s.get_dest(); | |
743 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
744 assert(s.next_bci() == limit_bci, "branch must end block"); | |
745 successors.push(_methodBlocks->block_containing(dest_bci)); | |
746 break; | |
747 } | |
748 case Bytecodes::_goto: | |
749 { | |
750 int dest_bci = s.get_dest(); | |
751 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
752 assert(s.next_bci() == limit_bci, "branch must end block"); | |
753 successors.push(_methodBlocks->block_containing(dest_bci)); | |
754 fall_through = false; | |
755 break; | |
756 } | |
757 case Bytecodes::_jsr: | |
758 { | |
759 int dest_bci = s.get_dest(); | |
760 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
761 assert(s.next_bci() == limit_bci, "branch must end block"); | |
762 state.apush(empty_map); | |
763 successors.push(_methodBlocks->block_containing(dest_bci)); | |
764 fall_through = false; | |
765 break; | |
766 } | |
767 case Bytecodes::_ret: | |
768 // we don't track the destination of a "ret" instruction | |
769 assert(s.next_bci() == limit_bci, "branch must end block"); | |
770 fall_through = false; | |
771 break; | |
772 case Bytecodes::_return: | |
773 assert(s.next_bci() == limit_bci, "return must end block"); | |
774 fall_through = false; | |
775 break; | |
776 case Bytecodes::_tableswitch: | |
777 { | |
778 state.spop(); | |
2142 | 779 Bytecode_tableswitch sw(&s); |
780 int len = sw.length(); | |
0 | 781 int dest_bci; |
782 for (int i = 0; i < len; i++) { | |
2142 | 783 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
0 | 784 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
785 successors.push(_methodBlocks->block_containing(dest_bci)); | |
786 } | |
2142 | 787 dest_bci = s.cur_bci() + sw.default_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 assert(s.next_bci() == limit_bci, "branch must end block"); | |
791 fall_through = false; | |
792 break; | |
793 } | |
794 case Bytecodes::_lookupswitch: | |
795 { | |
796 state.spop(); | |
2142 | 797 Bytecode_lookupswitch sw(&s); |
798 int len = sw.number_of_pairs(); | |
0 | 799 int dest_bci; |
800 for (int i = 0; i < len; i++) { | |
2142 | 801 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
0 | 802 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
803 successors.push(_methodBlocks->block_containing(dest_bci)); | |
804 } | |
2142 | 805 dest_bci = s.cur_bci() + sw.default_offset(); |
0 | 806 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
807 successors.push(_methodBlocks->block_containing(dest_bci)); | |
808 fall_through = false; | |
809 break; | |
810 } | |
811 case Bytecodes::_ireturn: | |
812 case Bytecodes::_freturn: | |
813 state.spop(); | |
814 fall_through = false; | |
815 break; | |
816 case Bytecodes::_lreturn: | |
817 case Bytecodes::_dreturn: | |
818 state.lpop(); | |
819 fall_through = false; | |
820 break; | |
821 case Bytecodes::_areturn: | |
822 set_returned(state.apop()); | |
823 fall_through = false; | |
824 break; | |
825 case Bytecodes::_getstatic: | |
826 case Bytecodes::_getfield: | |
827 { bool will_link; | |
828 ciField* field = s.get_field(will_link); | |
829 BasicType field_type = field->type()->basic_type(); | |
830 if (s.cur_bc() != Bytecodes::_getstatic) { | |
831 set_method_escape(state.apop()); | |
832 } | |
833 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
834 state.apush(unknown_obj); | |
835 } else if (type2size[field_type] == 1) { | |
836 state.spush(); | |
837 } else { | |
838 state.lpush(); | |
839 } | |
840 } | |
841 break; | |
842 case Bytecodes::_putstatic: | |
843 case Bytecodes::_putfield: | |
844 { bool will_link; | |
845 ciField* field = s.get_field(will_link); | |
846 BasicType field_type = field->type()->basic_type(); | |
847 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
848 set_global_escape(state.apop()); | |
849 } else if (type2size[field_type] == 1) { | |
850 state.spop(); | |
851 } else { | |
852 state.lpop(); | |
853 } | |
854 if (s.cur_bc() != Bytecodes::_putstatic) { | |
855 ArgumentMap p = state.apop(); | |
856 set_method_escape(p); | |
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857 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
0 | 858 } |
859 } | |
860 break; | |
861 case Bytecodes::_invokevirtual: | |
862 case Bytecodes::_invokespecial: | |
863 case Bytecodes::_invokestatic: | |
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864 case Bytecodes::_invokedynamic: |
0 | 865 case Bytecodes::_invokeinterface: |
866 { bool will_link; | |
867 ciMethod* target = s.get_method(will_link); | |
868 ciKlass* holder = s.get_declared_method_holder(); | |
869 invoke(state, s.cur_bc(), target, holder); | |
870 ciType* return_type = target->return_type(); | |
871 if (!return_type->is_primitive_type()) { | |
872 state.apush(unknown_obj); | |
873 } else if (return_type->is_one_word()) { | |
874 state.spush(); | |
875 } else if (return_type->is_two_word()) { | |
876 state.lpush(); | |
877 } | |
878 } | |
879 break; | |
880 case Bytecodes::_new: | |
881 state.apush(allocated_obj); | |
882 break; | |
883 case Bytecodes::_newarray: | |
884 case Bytecodes::_anewarray: | |
885 state.spop(); | |
886 state.apush(allocated_obj); | |
887 break; | |
888 case Bytecodes::_multianewarray: | |
889 { int i = s.cur_bcp()[3]; | |
890 while (i-- > 0) state.spop(); | |
891 state.apush(allocated_obj); | |
892 } | |
893 break; | |
894 case Bytecodes::_arraylength: | |
895 set_method_escape(state.apop()); | |
896 state.spush(); | |
897 break; | |
898 case Bytecodes::_athrow: | |
899 set_global_escape(state.apop()); | |
900 fall_through = false; | |
901 break; | |
902 case Bytecodes::_checkcast: | |
903 { ArgumentMap obj = state.apop(); | |
904 set_method_escape(obj); | |
905 state.apush(obj); | |
906 } | |
907 break; | |
908 case Bytecodes::_instanceof: | |
909 set_method_escape(state.apop()); | |
910 state.spush(); | |
911 break; | |
912 case Bytecodes::_monitorenter: | |
913 case Bytecodes::_monitorexit: | |
914 state.apop(); | |
915 break; | |
916 case Bytecodes::_wide: | |
917 ShouldNotReachHere(); | |
918 break; | |
919 case Bytecodes::_ifnull: | |
920 case Bytecodes::_ifnonnull: | |
921 { | |
922 set_method_escape(state.apop()); | |
923 int dest_bci = s.get_dest(); | |
924 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
925 assert(s.next_bci() == limit_bci, "branch must end block"); | |
926 successors.push(_methodBlocks->block_containing(dest_bci)); | |
927 break; | |
928 } | |
929 case Bytecodes::_goto_w: | |
930 { | |
931 int dest_bci = s.get_far_dest(); | |
932 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
933 assert(s.next_bci() == limit_bci, "branch must end block"); | |
934 successors.push(_methodBlocks->block_containing(dest_bci)); | |
935 fall_through = false; | |
936 break; | |
937 } | |
938 case Bytecodes::_jsr_w: | |
939 { | |
940 int dest_bci = s.get_far_dest(); | |
941 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
942 assert(s.next_bci() == limit_bci, "branch must end block"); | |
943 state.apush(empty_map); | |
944 successors.push(_methodBlocks->block_containing(dest_bci)); | |
945 fall_through = false; | |
946 break; | |
947 } | |
948 case Bytecodes::_breakpoint: | |
949 break; | |
950 default: | |
951 ShouldNotReachHere(); | |
952 break; | |
953 } | |
954 | |
955 } | |
956 if (fall_through) { | |
957 int fall_through_bci = s.cur_bci(); | |
958 if (fall_through_bci < _method->code_size()) { | |
959 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
960 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
961 } | |
962 } | |
963 } | |
964 | |
965 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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966 StateInfo *d_state = blockstates + dest->index(); |
0 | 967 int nlocals = _method->max_locals(); |
968 | |
969 // exceptions may cause transfer of control to handlers in the middle of a | |
970 // block, so we don't merge the incoming state of exception handlers | |
971 if (dest->is_handler()) | |
972 return; | |
973 if (!d_state->_initialized ) { | |
974 // destination not initialized, just copy | |
975 for (int i = 0; i < nlocals; i++) { | |
976 d_state->_vars[i] = s_state->_vars[i]; | |
977 } | |
978 for (int i = 0; i < s_state->_stack_height; i++) { | |
979 d_state->_stack[i] = s_state->_stack[i]; | |
980 } | |
981 d_state->_stack_height = s_state->_stack_height; | |
982 d_state->_max_stack = s_state->_max_stack; | |
983 d_state->_initialized = true; | |
984 } else if (!dest->processed()) { | |
985 // we have not yet walked the bytecodes of dest, we can merge | |
986 // the states | |
987 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
988 for (int i = 0; i < nlocals; i++) { | |
989 d_state->_vars[i].set_union(s_state->_vars[i]); | |
990 } | |
991 for (int i = 0; i < s_state->_stack_height; i++) { | |
992 d_state->_stack[i].set_union(s_state->_stack[i]); | |
993 } | |
994 } else { | |
995 // the bytecodes of dest have already been processed, mark any | |
996 // arguments in the source state which are not in the dest state | |
997 // as global escape. | |
998 // Future refinement: we only need to mark these variable to the | |
999 // maximum escape of any variables in dest state | |
1000 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
1001 ArgumentMap extra_vars; | |
1002 for (int i = 0; i < nlocals; i++) { | |
1003 ArgumentMap t; | |
1004 t = s_state->_vars[i]; | |
1005 t.set_difference(d_state->_vars[i]); | |
1006 extra_vars.set_union(t); | |
1007 } | |
1008 for (int i = 0; i < s_state->_stack_height; i++) { | |
1009 ArgumentMap t; | |
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1010 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
0 | 1011 t.clear(); |
1012 t = s_state->_stack[i]; | |
1013 t.set_difference(d_state->_stack[i]); | |
1014 extra_vars.set_union(t); | |
1015 } | |
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1016 set_global_escape(extra_vars, true); |
0 | 1017 } |
1018 } | |
1019 | |
1020 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
1021 int numblocks = _methodBlocks->num_blocks(); | |
1022 int stkSize = _method->max_stack(); | |
1023 int numLocals = _method->max_locals(); | |
1024 StateInfo state; | |
1025 | |
1026 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
1027 int datasize = datacount * sizeof(ArgumentMap); | |
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1028 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
0 | 1029 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
1030 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
1031 ArgumentMap *dp = statedata; | |
1032 state._vars = dp; | |
1033 dp += numLocals; | |
1034 state._stack = dp; | |
1035 dp += stkSize; | |
1036 state._initialized = false; | |
1037 state._max_stack = stkSize; | |
1038 for (int i = 0; i < numblocks; i++) { | |
1039 blockstates[i]._vars = dp; | |
1040 dp += numLocals; | |
1041 blockstates[i]._stack = dp; | |
1042 dp += stkSize; | |
1043 blockstates[i]._initialized = false; | |
1044 blockstates[i]._stack_height = 0; | |
1045 blockstates[i]._max_stack = stkSize; | |
1046 } | |
1047 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
1048 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
1049 | |
1050 _methodBlocks->clear_processed(); | |
1051 | |
1052 // initialize block 0 state from method signature | |
1053 ArgumentMap allVars; // all oop arguments to method | |
1054 ciSignature* sig = method()->signature(); | |
1055 int j = 0; | |
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1056 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1057 int fb_i = first_blk->index(); |
0 | 1058 if (!method()->is_static()) { |
1059 // record information for "this" | |
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1060 blockstates[fb_i]._vars[j].set(j); |
0 | 1061 allVars.add(j); |
1062 j++; | |
1063 } | |
1064 for (int i = 0; i < sig->count(); i++) { | |
1065 ciType* t = sig->type_at(i); | |
1066 if (!t->is_primitive_type()) { | |
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1067 blockstates[fb_i]._vars[j].set(j); |
0 | 1068 allVars.add(j); |
1069 } | |
1070 j += t->size(); | |
1071 } | |
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1072 blockstates[fb_i]._initialized = true; |
0 | 1073 assert(j == _arg_size, "just checking"); |
1074 | |
1075 ArgumentMap unknown_map; | |
1076 unknown_map.add_unknown(); | |
1077 | |
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1078 worklist.push(first_blk); |
0 | 1079 while(worklist.length() > 0) { |
1080 ciBlock *blk = worklist.pop(); | |
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1081 StateInfo *blkState = blockstates + blk->index(); |
0 | 1082 if (blk->is_handler() || blk->is_ret_target()) { |
1083 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1084 // that any variable could contain any argument |
0 | 1085 for (int i = 0; i < numLocals; i++) { |
1086 state._vars[i] = allVars; | |
1087 } | |
1088 if (blk->is_handler()) { | |
1089 state._stack_height = 1; | |
1090 } else { | |
1091 state._stack_height = blkState->_stack_height; | |
1092 } | |
1093 for (int i = 0; i < state._stack_height; i++) { | |
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1094 // ??? should this be unknown_map ??? |
0 | 1095 state._stack[i] = allVars; |
1096 } | |
1097 } else { | |
1098 for (int i = 0; i < numLocals; i++) { | |
1099 state._vars[i] = blkState->_vars[i]; | |
1100 } | |
1101 for (int i = 0; i < blkState->_stack_height; i++) { | |
1102 state._stack[i] = blkState->_stack[i]; | |
1103 } | |
1104 state._stack_height = blkState->_stack_height; | |
1105 } | |
1106 iterate_one_block(blk, state, successors); | |
1107 // if this block has any exception handlers, push them | |
1108 // onto successor list | |
1109 if (blk->has_handler()) { | |
1110 DEBUG_ONLY(int handler_count = 0;) | |
1111 int blk_start = blk->start_bci(); | |
1112 int blk_end = blk->limit_bci(); | |
1113 for (int i = 0; i < numblocks; i++) { | |
1114 ciBlock *b = _methodBlocks->block(i); | |
1115 if (b->is_handler()) { | |
1116 int ex_start = b->ex_start_bci(); | |
1117 int ex_end = b->ex_limit_bci(); | |
1118 if ((ex_start >= blk_start && ex_start < blk_end) || | |
1119 (ex_end > blk_start && ex_end <= blk_end)) { | |
1120 successors.push(b); | |
1121 } | |
1122 DEBUG_ONLY(handler_count++;) | |
1123 } | |
1124 } | |
1125 assert(handler_count > 0, "must find at least one handler"); | |
1126 } | |
1127 // merge computed variable state with successors | |
1128 while(successors.length() > 0) { | |
1129 ciBlock *succ = successors.pop(); | |
1130 merge_block_states(blockstates, succ, &state); | |
1131 if (!succ->processed()) | |
1132 worklist.push(succ); | |
1133 } | |
1134 } | |
1135 } | |
1136 | |
1137 bool BCEscapeAnalyzer::do_analysis() { | |
1138 Arena* arena = CURRENT_ENV->arena(); | |
1139 // identify basic blocks | |
1140 _methodBlocks = _method->get_method_blocks(); | |
1141 | |
1142 iterate_blocks(arena); | |
1143 // TEMPORARY | |
1144 return true; | |
1145 } | |
1146 | |
1147 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
1148 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
1149 | |
1150 if (iid == vmIntrinsics::_getClass || | |
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1151 iid == vmIntrinsics::_fillInStackTrace || |
0 | 1152 iid == vmIntrinsics::_hashCode) |
1153 return iid; | |
1154 else | |
1155 return vmIntrinsics::_none; | |
1156 } | |
1157 | |
1158 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1159 ArgumentMap arg; |
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1160 arg.clear(); |
0 | 1161 switch (iid) { |
1162 case vmIntrinsics::_getClass: | |
1163 _return_local = false; | |
1164 break; | |
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1165 case vmIntrinsics::_fillInStackTrace: |
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1166 arg.set(0); // 'this' |
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1167 set_returned(arg); |
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1168 break; |
0 | 1169 case vmIntrinsics::_hashCode: |
1170 // initialized state is correct | |
1171 break; | |
1172 default: | |
1173 assert(false, "unexpected intrinsic"); | |
1174 } | |
1175 return true; | |
1176 } | |
1177 | |
1178 void BCEscapeAnalyzer::initialize() { | |
1179 int i; | |
1180 | |
1181 // clear escape information (method may have been deoptimized) | |
1182 methodData()->clear_escape_info(); | |
1183 | |
1184 // initialize escape state of object parameters | |
1185 ciSignature* sig = method()->signature(); | |
1186 int j = 0; | |
1187 if (!method()->is_static()) { | |
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1188 _arg_local.set(0); |
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1189 _arg_stack.set(0); |
0 | 1190 j++; |
1191 } | |
1192 for (i = 0; i < sig->count(); i++) { | |
1193 ciType* t = sig->type_at(i); | |
1194 if (!t->is_primitive_type()) { | |
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1195 _arg_local.set(j); |
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1196 _arg_stack.set(j); |
0 | 1197 } |
1198 j += t->size(); | |
1199 } | |
1200 assert(j == _arg_size, "just checking"); | |
1201 | |
1202 // start with optimistic assumption | |
1203 ciType *rt = _method->return_type(); | |
1204 if (rt->is_primitive_type()) { | |
1205 _return_local = false; | |
1206 _return_allocated = false; | |
1207 } else { | |
1208 _return_local = true; | |
1209 _return_allocated = true; | |
1210 } | |
1211 _allocated_escapes = false; | |
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1212 _unknown_modified = false; |
0 | 1213 } |
1214 | |
1215 void BCEscapeAnalyzer::clear_escape_info() { | |
1216 ciSignature* sig = method()->signature(); | |
1217 int arg_count = sig->count(); | |
1218 ArgumentMap var; | |
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1219 if (!method()->is_static()) { |
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1220 arg_count++; // allow for "this" |
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1221 } |
0 | 1222 for (int i = 0; i < arg_count; i++) { |
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1223 set_arg_modified(i, OFFSET_ANY, 4); |
0 | 1224 var.clear(); |
1225 var.set(i); | |
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1226 set_modified(var, OFFSET_ANY, 4); |
0 | 1227 set_global_escape(var); |
1228 } | |
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1229 _arg_local.Clear(); |
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1230 _arg_stack.Clear(); |
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1231 _arg_returned.Clear(); |
0 | 1232 _return_local = false; |
1233 _return_allocated = false; | |
1234 _allocated_escapes = true; | |
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1235 _unknown_modified = true; |
0 | 1236 } |
1237 | |
1238 | |
1239 void BCEscapeAnalyzer::compute_escape_info() { | |
1240 int i; | |
1241 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
1242 | |
1243 vmIntrinsics::ID iid = known_intrinsic(); | |
1244 | |
1245 // check if method can be analyzed | |
1246 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
1247 || _level > MaxBCEAEstimateLevel | |
1248 || method()->code_size() > MaxBCEAEstimateSize)) { | |
1249 if (BCEATraceLevel >= 1) { | |
1250 tty->print("Skipping method because: "); | |
1251 if (method()->is_abstract()) | |
1252 tty->print_cr("method is abstract."); | |
1253 else if (method()->is_native()) | |
1254 tty->print_cr("method is native."); | |
1255 else if (!method()->holder()->is_initialized()) | |
1256 tty->print_cr("class of method is not initialized."); | |
1257 else if (_level > MaxBCEAEstimateLevel) | |
1258 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
1259 _level, MaxBCEAEstimateLevel); | |
1260 else if (method()->code_size() > MaxBCEAEstimateSize) | |
1261 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize.", | |
1262 method()->code_size(), MaxBCEAEstimateSize); | |
1263 else | |
1264 ShouldNotReachHere(); | |
1265 } | |
1266 clear_escape_info(); | |
1267 | |
1268 return; | |
1269 } | |
1270 | |
1271 if (BCEATraceLevel >= 1) { | |
1272 tty->print("[EA] estimating escape information for"); | |
1273 if (iid != vmIntrinsics::_none) | |
1274 tty->print(" intrinsic"); | |
1275 method()->print_short_name(); | |
1276 tty->print_cr(" (%d bytes)", method()->code_size()); | |
1277 } | |
1278 | |
1279 bool success; | |
1280 | |
1281 initialize(); | |
1282 | |
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1283 // Do not scan method if it has no object parameters and |
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1284 // does not returns an object (_return_allocated is set in initialize()). |
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1285 if (_arg_local.Size() == 0 && !_return_allocated) { |
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1286 // Clear all info since method's bytecode was not analysed and |
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1287 // set pessimistic escape information. |
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1288 clear_escape_info(); |
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1289 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1290 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
0 | 1291 methodData()->set_eflag(methodDataOopDesc::estimated); |
1292 return; | |
1293 } | |
1294 | |
1295 if (iid != vmIntrinsics::_none) | |
1296 success = compute_escape_for_intrinsic(iid); | |
1297 else { | |
1298 success = do_analysis(); | |
1299 } | |
1300 | |
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1301 // don't store interprocedural escape information if it introduces |
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1302 // dependencies or if method data is empty |
0 | 1303 // |
1304 if (!has_dependencies() && !methodData()->is_empty()) { | |
1305 for (i = 0; i < _arg_size; i++) { | |
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1306 if (_arg_local.test(i)) { |
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1307 assert(_arg_stack.test(i), "inconsistent escape info"); |
0 | 1308 methodData()->set_arg_local(i); |
1309 methodData()->set_arg_stack(i); | |
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1310 } else if (_arg_stack.test(i)) { |
0 | 1311 methodData()->set_arg_stack(i); |
1312 } | |
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1313 if (_arg_returned.test(i)) { |
0 | 1314 methodData()->set_arg_returned(i); |
1315 } | |
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1316 methodData()->set_arg_modified(i, _arg_modified[i]); |
0 | 1317 } |
1318 if (_return_local) { | |
1319 methodData()->set_eflag(methodDataOopDesc::return_local); | |
1320 } | |
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1321 if (_return_allocated) { |
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1322 methodData()->set_eflag(methodDataOopDesc::return_allocated); |
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1323 } |
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1324 if (_allocated_escapes) { |
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1325 methodData()->set_eflag(methodDataOopDesc::allocated_escapes); |
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1326 } |
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1327 if (_unknown_modified) { |
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1328 methodData()->set_eflag(methodDataOopDesc::unknown_modified); |
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1329 } |
0 | 1330 methodData()->set_eflag(methodDataOopDesc::estimated); |
1331 } | |
1332 } | |
1333 | |
1334 void BCEscapeAnalyzer::read_escape_info() { | |
1335 assert(methodData()->has_escape_info(), "no escape info available"); | |
1336 | |
1337 // read escape information from method descriptor | |
1338 for (int i = 0; i < _arg_size; i++) { | |
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1339 if (methodData()->is_arg_local(i)) |
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1340 _arg_local.set(i); |
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1341 if (methodData()->is_arg_stack(i)) |
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1342 _arg_stack.set(i); |
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1343 if (methodData()->is_arg_returned(i)) |
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1344 _arg_returned.set(i); |
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1345 _arg_modified[i] = methodData()->arg_modified(i); |
0 | 1346 } |
1347 _return_local = methodData()->eflag_set(methodDataOopDesc::return_local); | |
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1348 _return_allocated = methodData()->eflag_set(methodDataOopDesc::return_allocated); |
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1349 _allocated_escapes = methodData()->eflag_set(methodDataOopDesc::allocated_escapes); |
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1350 _unknown_modified = methodData()->eflag_set(methodDataOopDesc::unknown_modified); |
0 | 1351 |
1352 } | |
1353 | |
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1354 #ifndef PRODUCT |
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1355 void BCEscapeAnalyzer::dump() { |
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1356 tty->print("[EA] estimated escape information for"); |
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1357 method()->print_short_name(); |
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1358 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1359 tty->print(" non-escaping args: "); |
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1360 _arg_local.print_on(tty); |
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1361 tty->print(" stack-allocatable args: "); |
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1362 _arg_stack.print_on(tty); |
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1363 if (_return_local) { |
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1364 tty->print(" returned args: "); |
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1365 _arg_returned.print_on(tty); |
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1366 } else if (is_return_allocated()) { |
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1367 tty->print_cr(" return allocated value"); |
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1368 } else { |
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1369 tty->print_cr(" return non-local value"); |
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1370 } |
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1371 tty->print(" modified args: "); |
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1372 for (int i = 0; i < _arg_size; i++) { |
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1373 if (_arg_modified[i] == 0) |
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1374 tty->print(" 0"); |
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1375 else |
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1376 tty->print(" 0x%x", _arg_modified[i]); |
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1377 } |
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1378 tty->cr(); |
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1379 tty->print(" flags: "); |
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1380 if (_return_allocated) |
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1381 tty->print(" return_allocated"); |
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1382 if (_allocated_escapes) |
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1383 tty->print(" allocated_escapes"); |
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1384 if (_unknown_modified) |
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1385 tty->print(" unknown_modified"); |
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1386 tty->cr(); |
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1387 } |
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1388 #endif |
0 | 1389 |
1390 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
1391 : _conservative(method == NULL || !EstimateArgEscape) | |
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1392 , _arena(CURRENT_ENV->arena()) |
0 | 1393 , _method(method) |
1394 , _methodData(method ? method->method_data() : NULL) | |
1395 , _arg_size(method ? method->arg_size() : 0) | |
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1396 , _arg_local(_arena) |
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1397 , _arg_stack(_arena) |
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1398 , _arg_returned(_arena) |
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1399 , _dirty(_arena) |
0 | 1400 , _return_local(false) |
1401 , _return_allocated(false) | |
1402 , _allocated_escapes(false) | |
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1403 , _unknown_modified(false) |
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1404 , _dependencies(_arena, 4, 0, NULL) |
0 | 1405 , _parent(parent) |
1406 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
1407 if (!_conservative) { | |
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1408 _arg_local.Clear(); |
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1409 _arg_stack.Clear(); |
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1410 _arg_returned.Clear(); |
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1411 _dirty.Clear(); |
0 | 1412 Arena* arena = CURRENT_ENV->arena(); |
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1413 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1414 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
0 | 1415 |
1416 if (methodData() == NULL) | |
1417 return; | |
1418 bool printit = _method->should_print_assembly(); | |
1419 if (methodData()->has_escape_info()) { | |
1420 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
1421 method->holder()->name()->as_utf8(), | |
1422 method->name()->as_utf8())); | |
1423 read_escape_info(); | |
1424 } else { | |
1425 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
1426 method->holder()->name()->as_utf8(), | |
1427 method->name()->as_utf8())); | |
1428 | |
1429 compute_escape_info(); | |
1430 methodData()->update_escape_info(); | |
1431 } | |
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1432 #ifndef PRODUCT |
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6680665: bytecode Escape Analyzer produces incorrect escape information for methods without oop arguments
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1433 if (BCEATraceLevel >= 3) { |
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6680665: bytecode Escape Analyzer produces incorrect escape information for methods without oop arguments
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1434 // dump escape information |
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6680665: bytecode Escape Analyzer produces incorrect escape information for methods without oop arguments
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1435 dump(); |
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6680665: bytecode Escape Analyzer produces incorrect escape information for methods without oop arguments
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1436 } |
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6680665: bytecode Escape Analyzer produces incorrect escape information for methods without oop arguments
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1437 #endif |
0 | 1438 } |
1439 } | |
1440 | |
1441 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
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6943485: JVMTI always on capabilities change code generation too much
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1442 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
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1443 // Also record evol dependencies so redefinition of the |
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1444 // callee will trigger recompilation. |
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1445 deps->assert_evol_method(method()); |
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1446 } |
0 | 1447 for (int i = 0; i < _dependencies.length(); i+=2) { |
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1448 ciKlass *k = _dependencies.at(i)->as_klass(); |
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1449 ciMethod *m = _dependencies.at(i+1)->as_method(); |
0 | 1450 deps->assert_unique_concrete_method(k, m); |
1451 } | |
1452 } |