Mercurial > hg > graal-jvmci-8
annotate src/share/vm/ci/bcEscapeAnalyzer.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
parents | dd9cc155639c |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2014, 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 | |
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45 // Maintain a map of which arguments a local variable or |
0 | 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; | |
20729 | 92 int _stack_height; |
93 int _max_stack; | |
0 | 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 // return true if all argument elements of vars are returned |
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142 bool BCEscapeAnalyzer::returns_all(ArgumentMap vars) { |
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143 for (int i = 0; i < _arg_size; i++) { |
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144 if (vars.contains(i) && !_arg_returned.test(i)) { |
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145 return false; |
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146 } |
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147 } |
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148 return true; |
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149 } |
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150 |
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151 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) { |
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152 for (int i = 0; i < _arg_size; i++) { |
0 | 153 if (vars.contains(i)) { |
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154 bm >>= i; |
0 | 155 } |
156 } | |
157 } | |
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158 |
0 | 159 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) { |
160 clear_bits(vars, _arg_local); | |
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161 if (vars.contains_allocated()) { |
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162 _allocated_escapes = true; |
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163 } |
0 | 164 } |
165 | |
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166 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) { |
0 | 167 clear_bits(vars, _arg_local); |
168 clear_bits(vars, _arg_stack); | |
169 if (vars.contains_allocated()) | |
170 _allocated_escapes = true; | |
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171 |
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172 if (merge && !vars.is_empty()) { |
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173 // Merge new state into already processed block. |
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174 // New state is not taken into account and |
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175 // it may invalidate set_returned() result. |
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176 if (vars.contains_unknown() || vars.contains_allocated()) { |
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177 _return_local = false; |
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178 } |
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179 if (vars.contains_unknown() || vars.contains_vars()) { |
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180 _return_allocated = false; |
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181 } |
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182 if (_return_local && vars.contains_vars() && !returns_all(vars)) { |
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183 // Return result should be invalidated if args in new |
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184 // state are not recorded in return state. |
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185 _return_local = false; |
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186 } |
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187 } |
0 | 188 } |
189 | |
190 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) { | |
191 clear_bits(vars, _dirty); | |
192 } | |
193 | |
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194 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) { |
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195 |
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196 for (int i = 0; i < _arg_size; i++) { |
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197 if (vars.contains(i)) { |
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198 set_arg_modified(i, offs, size); |
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199 } |
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200 } |
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201 if (vars.contains_unknown()) |
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202 _unknown_modified = true; |
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203 } |
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204 |
0 | 205 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) { |
206 for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) { | |
207 if (scope->method() == callee) { | |
208 return true; | |
209 } | |
210 } | |
211 return false; | |
212 } | |
213 | |
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214 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) { |
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215 if (offset == OFFSET_ANY) |
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216 return _arg_modified[arg] != 0; |
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217 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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218 bool modified = false; |
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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 modified = modified || (_arg_modified[arg] & (1 << i)) != 0; |
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227 } |
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228 return modified; |
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229 } |
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230 |
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231 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) { |
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232 if (offset == OFFSET_ANY) { |
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233 _arg_modified[arg] = (uint) -1; |
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234 return; |
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235 } |
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236 assert(arg >= 0 && arg < _arg_size, "must be an argument."); |
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237 int l = offset / HeapWordSize; |
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238 int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize; |
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239 if (l > ARG_OFFSET_MAX) |
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240 l = ARG_OFFSET_MAX; |
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241 if (h > ARG_OFFSET_MAX+1) |
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242 h = ARG_OFFSET_MAX + 1; |
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243 for (int i = l; i < h; i++) { |
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244 _arg_modified[arg] |= (1 << i); |
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245 } |
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246 } |
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247 |
0 | 248 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) { |
249 int i; | |
250 | |
251 // retrieve information about the callee | |
252 ciInstanceKlass* klass = target->holder(); | |
253 ciInstanceKlass* calling_klass = method()->holder(); | |
254 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); | |
255 ciInstanceKlass* actual_recv = callee_holder; | |
256 | |
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257 // Some methods are obviously bindable without any type checks so |
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258 // convert them directly to an invokespecial or invokestatic. |
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259 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { |
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260 switch (code) { |
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261 case Bytecodes::_invokevirtual: |
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262 code = Bytecodes::_invokespecial; |
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263 break; |
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264 case Bytecodes::_invokehandle: |
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265 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; |
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266 break; |
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267 } |
154
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268 } |
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269 |
0 | 270 // compute size of arguments |
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271 int arg_size = target->invoke_arg_size(code); |
0 | 272 int arg_base = MAX2(state._stack_height - arg_size, 0); |
273 | |
274 // direct recursive calls are skipped if they can be bound statically without introducing | |
275 // dependencies and if parameters are passed at the same position as in the current method | |
276 // other calls are skipped if there are no unescaped arguments passed to them | |
277 bool directly_recursive = (method() == target) && | |
278 (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty()); | |
279 | |
280 // check if analysis of callee can safely be skipped | |
281 bool skip_callee = true; | |
282 for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) { | |
283 ArgumentMap arg = state._stack[i]; | |
284 skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base)); | |
285 } | |
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286 // For now we conservatively skip invokedynamic. |
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287 if (code == Bytecodes::_invokedynamic) { |
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288 skip_callee = true; |
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289 } |
0 | 290 if (skip_callee) { |
291 TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8())); | |
292 for (i = 0; i < arg_size; i++) { | |
293 set_method_escape(state.raw_pop()); | |
294 } | |
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295 _unknown_modified = true; // assume the worst since we don't analyze the called method |
0 | 296 return; |
297 } | |
298 | |
299 // determine actual method (use CHA if necessary) | |
300 ciMethod* inline_target = NULL; | |
301 if (target->is_loaded() && klass->is_loaded() | |
302 && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) | |
6973 | 303 && target->is_loaded()) { |
0 | 304 if (code == Bytecodes::_invokestatic |
305 || code == Bytecodes::_invokespecial | |
306 || code == Bytecodes::_invokevirtual && target->is_final_method()) { | |
307 inline_target = target; | |
308 } else { | |
309 inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); | |
310 } | |
311 } | |
312 | |
313 if (inline_target != NULL && !is_recursive_call(inline_target)) { | |
314 // analyze callee | |
315 BCEscapeAnalyzer analyzer(inline_target, this); | |
316 | |
317 // adjust escape state of actual parameters | |
318 bool must_record_dependencies = false; | |
319 for (i = arg_size - 1; i >= 0; i--) { | |
320 ArgumentMap arg = state.raw_pop(); | |
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321 // Check if callee arg is a caller arg or an allocated object |
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322 bool allocated = arg.contains_allocated(); |
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323 if (!(is_argument(arg) || allocated)) |
0 | 324 continue; |
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325 for (int j = 0; j < _arg_size; j++) { |
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326 if (arg.contains(j)) { |
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327 _arg_modified[j] |= analyzer._arg_modified[i]; |
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328 } |
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329 } |
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330 if (!(is_arg_stack(arg) || allocated)) { |
0 | 331 // arguments have already been recognized as escaping |
332 } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) { | |
333 set_method_escape(arg); | |
334 must_record_dependencies = true; | |
335 } else { | |
336 set_global_escape(arg); | |
337 } | |
338 } | |
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339 _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects(); |
0 | 340 |
341 // record dependencies if at least one parameter retained stack-allocatable | |
342 if (must_record_dependencies) { | |
343 if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) { | |
344 _dependencies.append(actual_recv); | |
345 _dependencies.append(inline_target); | |
346 } | |
347 _dependencies.appendAll(analyzer.dependencies()); | |
348 } | |
349 } else { | |
350 TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.", | |
351 target->name()->as_utf8())); | |
352 // conservatively mark all actual parameters as escaping globally | |
353 for (i = 0; i < arg_size; i++) { | |
354 ArgumentMap arg = state.raw_pop(); | |
355 if (!is_argument(arg)) | |
356 continue; | |
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357 set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 358 set_global_escape(arg); |
359 } | |
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360 _unknown_modified = true; // assume the worst since we don't know the called method |
0 | 361 } |
362 } | |
363 | |
364 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) { | |
365 return ((~arg_set1) | arg_set2) == 0; | |
366 } | |
367 | |
368 | |
369 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) { | |
370 | |
371 blk->set_processed(); | |
372 ciBytecodeStream s(method()); | |
373 int limit_bci = blk->limit_bci(); | |
374 bool fall_through = false; | |
375 ArgumentMap allocated_obj; | |
376 allocated_obj.add_allocated(); | |
377 ArgumentMap unknown_obj; | |
378 unknown_obj.add_unknown(); | |
379 ArgumentMap empty_map; | |
380 | |
381 s.reset_to_bci(blk->start_bci()); | |
382 while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) { | |
383 fall_through = true; | |
384 switch (s.cur_bc()) { | |
385 case Bytecodes::_nop: | |
386 break; | |
387 case Bytecodes::_aconst_null: | |
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388 state.apush(unknown_obj); |
0 | 389 break; |
390 case Bytecodes::_iconst_m1: | |
391 case Bytecodes::_iconst_0: | |
392 case Bytecodes::_iconst_1: | |
393 case Bytecodes::_iconst_2: | |
394 case Bytecodes::_iconst_3: | |
395 case Bytecodes::_iconst_4: | |
396 case Bytecodes::_iconst_5: | |
397 case Bytecodes::_fconst_0: | |
398 case Bytecodes::_fconst_1: | |
399 case Bytecodes::_fconst_2: | |
400 case Bytecodes::_bipush: | |
401 case Bytecodes::_sipush: | |
402 state.spush(); | |
403 break; | |
404 case Bytecodes::_lconst_0: | |
405 case Bytecodes::_lconst_1: | |
406 case Bytecodes::_dconst_0: | |
407 case Bytecodes::_dconst_1: | |
408 state.lpush(); | |
409 break; | |
410 case Bytecodes::_ldc: | |
411 case Bytecodes::_ldc_w: | |
412 case Bytecodes::_ldc2_w: | |
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413 { |
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414 // Avoid calling get_constant() which will try to allocate |
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415 // unloaded constant. We need only constant's type. |
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416 int index = s.get_constant_pool_index(); |
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417 constantTag tag = s.get_constant_pool_tag(index); |
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418 if (tag.is_long() || tag.is_double()) { |
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419 // Only longs and doubles use 2 stack slots. |
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420 state.lpush(); |
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421 } else if (tag.basic_type() == T_OBJECT) { |
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422 state.apush(unknown_obj); |
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423 } else { |
0 | 424 state.spush(); |
425 } | |
426 break; | |
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427 } |
0 | 428 case Bytecodes::_aload: |
429 state.apush(state._vars[s.get_index()]); | |
430 break; | |
431 case Bytecodes::_iload: | |
432 case Bytecodes::_fload: | |
433 case Bytecodes::_iload_0: | |
434 case Bytecodes::_iload_1: | |
435 case Bytecodes::_iload_2: | |
436 case Bytecodes::_iload_3: | |
437 case Bytecodes::_fload_0: | |
438 case Bytecodes::_fload_1: | |
439 case Bytecodes::_fload_2: | |
440 case Bytecodes::_fload_3: | |
441 state.spush(); | |
442 break; | |
443 case Bytecodes::_lload: | |
444 case Bytecodes::_dload: | |
445 case Bytecodes::_lload_0: | |
446 case Bytecodes::_lload_1: | |
447 case Bytecodes::_lload_2: | |
448 case Bytecodes::_lload_3: | |
449 case Bytecodes::_dload_0: | |
450 case Bytecodes::_dload_1: | |
451 case Bytecodes::_dload_2: | |
452 case Bytecodes::_dload_3: | |
453 state.lpush(); | |
454 break; | |
455 case Bytecodes::_aload_0: | |
456 state.apush(state._vars[0]); | |
457 break; | |
458 case Bytecodes::_aload_1: | |
459 state.apush(state._vars[1]); | |
460 break; | |
461 case Bytecodes::_aload_2: | |
462 state.apush(state._vars[2]); | |
463 break; | |
464 case Bytecodes::_aload_3: | |
465 state.apush(state._vars[3]); | |
466 break; | |
467 case Bytecodes::_iaload: | |
468 case Bytecodes::_faload: | |
469 case Bytecodes::_baload: | |
470 case Bytecodes::_caload: | |
471 case Bytecodes::_saload: | |
472 state.spop(); | |
473 set_method_escape(state.apop()); | |
474 state.spush(); | |
475 break; | |
476 case Bytecodes::_laload: | |
477 case Bytecodes::_daload: | |
478 state.spop(); | |
479 set_method_escape(state.apop()); | |
480 state.lpush(); | |
481 break; | |
482 case Bytecodes::_aaload: | |
483 { state.spop(); | |
484 ArgumentMap array = state.apop(); | |
485 set_method_escape(array); | |
486 state.apush(unknown_obj); | |
487 set_dirty(array); | |
488 } | |
489 break; | |
490 case Bytecodes::_istore: | |
491 case Bytecodes::_fstore: | |
492 case Bytecodes::_istore_0: | |
493 case Bytecodes::_istore_1: | |
494 case Bytecodes::_istore_2: | |
495 case Bytecodes::_istore_3: | |
496 case Bytecodes::_fstore_0: | |
497 case Bytecodes::_fstore_1: | |
498 case Bytecodes::_fstore_2: | |
499 case Bytecodes::_fstore_3: | |
500 state.spop(); | |
501 break; | |
502 case Bytecodes::_lstore: | |
503 case Bytecodes::_dstore: | |
504 case Bytecodes::_lstore_0: | |
505 case Bytecodes::_lstore_1: | |
506 case Bytecodes::_lstore_2: | |
507 case Bytecodes::_lstore_3: | |
508 case Bytecodes::_dstore_0: | |
509 case Bytecodes::_dstore_1: | |
510 case Bytecodes::_dstore_2: | |
511 case Bytecodes::_dstore_3: | |
512 state.lpop(); | |
513 break; | |
514 case Bytecodes::_astore: | |
515 state._vars[s.get_index()] = state.apop(); | |
516 break; | |
517 case Bytecodes::_astore_0: | |
518 state._vars[0] = state.apop(); | |
519 break; | |
520 case Bytecodes::_astore_1: | |
521 state._vars[1] = state.apop(); | |
522 break; | |
523 case Bytecodes::_astore_2: | |
524 state._vars[2] = state.apop(); | |
525 break; | |
526 case Bytecodes::_astore_3: | |
527 state._vars[3] = state.apop(); | |
528 break; | |
529 case Bytecodes::_iastore: | |
530 case Bytecodes::_fastore: | |
531 case Bytecodes::_bastore: | |
532 case Bytecodes::_castore: | |
533 case Bytecodes::_sastore: | |
534 { | |
535 state.spop(); | |
536 state.spop(); | |
537 ArgumentMap arr = state.apop(); | |
538 set_method_escape(arr); | |
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539 set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize); |
0 | 540 break; |
541 } | |
542 case Bytecodes::_lastore: | |
543 case Bytecodes::_dastore: | |
544 { | |
545 state.lpop(); | |
546 state.spop(); | |
547 ArgumentMap arr = state.apop(); | |
548 set_method_escape(arr); | |
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549 set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize); |
0 | 550 break; |
551 } | |
552 case Bytecodes::_aastore: | |
553 { | |
554 set_global_escape(state.apop()); | |
555 state.spop(); | |
556 ArgumentMap arr = state.apop(); | |
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557 set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize); |
0 | 558 break; |
559 } | |
560 case Bytecodes::_pop: | |
561 state.raw_pop(); | |
562 break; | |
563 case Bytecodes::_pop2: | |
564 state.raw_pop(); | |
565 state.raw_pop(); | |
566 break; | |
567 case Bytecodes::_dup: | |
568 { ArgumentMap w1 = state.raw_pop(); | |
569 state.raw_push(w1); | |
570 state.raw_push(w1); | |
571 } | |
572 break; | |
573 case Bytecodes::_dup_x1: | |
574 { ArgumentMap w1 = state.raw_pop(); | |
575 ArgumentMap w2 = state.raw_pop(); | |
576 state.raw_push(w1); | |
577 state.raw_push(w2); | |
578 state.raw_push(w1); | |
579 } | |
580 break; | |
581 case Bytecodes::_dup_x2: | |
582 { ArgumentMap w1 = state.raw_pop(); | |
583 ArgumentMap w2 = state.raw_pop(); | |
584 ArgumentMap w3 = state.raw_pop(); | |
585 state.raw_push(w1); | |
586 state.raw_push(w3); | |
587 state.raw_push(w2); | |
588 state.raw_push(w1); | |
589 } | |
590 break; | |
591 case Bytecodes::_dup2: | |
592 { ArgumentMap w1 = state.raw_pop(); | |
593 ArgumentMap w2 = state.raw_pop(); | |
594 state.raw_push(w2); | |
595 state.raw_push(w1); | |
596 state.raw_push(w2); | |
597 state.raw_push(w1); | |
598 } | |
599 break; | |
600 case Bytecodes::_dup2_x1: | |
601 { ArgumentMap w1 = state.raw_pop(); | |
602 ArgumentMap w2 = state.raw_pop(); | |
603 ArgumentMap w3 = state.raw_pop(); | |
604 state.raw_push(w2); | |
605 state.raw_push(w1); | |
606 state.raw_push(w3); | |
607 state.raw_push(w2); | |
608 state.raw_push(w1); | |
609 } | |
610 break; | |
611 case Bytecodes::_dup2_x2: | |
612 { ArgumentMap w1 = state.raw_pop(); | |
613 ArgumentMap w2 = state.raw_pop(); | |
614 ArgumentMap w3 = state.raw_pop(); | |
615 ArgumentMap w4 = state.raw_pop(); | |
616 state.raw_push(w2); | |
617 state.raw_push(w1); | |
618 state.raw_push(w4); | |
619 state.raw_push(w3); | |
620 state.raw_push(w2); | |
621 state.raw_push(w1); | |
622 } | |
623 break; | |
624 case Bytecodes::_swap: | |
625 { ArgumentMap w1 = state.raw_pop(); | |
626 ArgumentMap w2 = state.raw_pop(); | |
627 state.raw_push(w1); | |
628 state.raw_push(w2); | |
629 } | |
630 break; | |
631 case Bytecodes::_iadd: | |
632 case Bytecodes::_fadd: | |
633 case Bytecodes::_isub: | |
634 case Bytecodes::_fsub: | |
635 case Bytecodes::_imul: | |
636 case Bytecodes::_fmul: | |
637 case Bytecodes::_idiv: | |
638 case Bytecodes::_fdiv: | |
639 case Bytecodes::_irem: | |
640 case Bytecodes::_frem: | |
641 case Bytecodes::_iand: | |
642 case Bytecodes::_ior: | |
643 case Bytecodes::_ixor: | |
644 state.spop(); | |
645 state.spop(); | |
646 state.spush(); | |
647 break; | |
648 case Bytecodes::_ladd: | |
649 case Bytecodes::_dadd: | |
650 case Bytecodes::_lsub: | |
651 case Bytecodes::_dsub: | |
652 case Bytecodes::_lmul: | |
653 case Bytecodes::_dmul: | |
654 case Bytecodes::_ldiv: | |
655 case Bytecodes::_ddiv: | |
656 case Bytecodes::_lrem: | |
657 case Bytecodes::_drem: | |
658 case Bytecodes::_land: | |
659 case Bytecodes::_lor: | |
660 case Bytecodes::_lxor: | |
661 state.lpop(); | |
662 state.lpop(); | |
663 state.lpush(); | |
664 break; | |
665 case Bytecodes::_ishl: | |
666 case Bytecodes::_ishr: | |
667 case Bytecodes::_iushr: | |
668 state.spop(); | |
669 state.spop(); | |
670 state.spush(); | |
671 break; | |
672 case Bytecodes::_lshl: | |
673 case Bytecodes::_lshr: | |
674 case Bytecodes::_lushr: | |
675 state.spop(); | |
676 state.lpop(); | |
677 state.lpush(); | |
678 break; | |
679 case Bytecodes::_ineg: | |
680 case Bytecodes::_fneg: | |
681 state.spop(); | |
682 state.spush(); | |
683 break; | |
684 case Bytecodes::_lneg: | |
685 case Bytecodes::_dneg: | |
686 state.lpop(); | |
687 state.lpush(); | |
688 break; | |
689 case Bytecodes::_iinc: | |
690 break; | |
691 case Bytecodes::_i2l: | |
692 case Bytecodes::_i2d: | |
693 case Bytecodes::_f2l: | |
694 case Bytecodes::_f2d: | |
695 state.spop(); | |
696 state.lpush(); | |
697 break; | |
698 case Bytecodes::_i2f: | |
699 case Bytecodes::_f2i: | |
700 state.spop(); | |
701 state.spush(); | |
702 break; | |
703 case Bytecodes::_l2i: | |
704 case Bytecodes::_l2f: | |
705 case Bytecodes::_d2i: | |
706 case Bytecodes::_d2f: | |
707 state.lpop(); | |
708 state.spush(); | |
709 break; | |
710 case Bytecodes::_l2d: | |
711 case Bytecodes::_d2l: | |
712 state.lpop(); | |
713 state.lpush(); | |
714 break; | |
715 case Bytecodes::_i2b: | |
716 case Bytecodes::_i2c: | |
717 case Bytecodes::_i2s: | |
718 state.spop(); | |
719 state.spush(); | |
720 break; | |
721 case Bytecodes::_lcmp: | |
722 case Bytecodes::_dcmpl: | |
723 case Bytecodes::_dcmpg: | |
724 state.lpop(); | |
725 state.lpop(); | |
726 state.spush(); | |
727 break; | |
728 case Bytecodes::_fcmpl: | |
729 case Bytecodes::_fcmpg: | |
730 state.spop(); | |
731 state.spop(); | |
732 state.spush(); | |
733 break; | |
734 case Bytecodes::_ifeq: | |
735 case Bytecodes::_ifne: | |
736 case Bytecodes::_iflt: | |
737 case Bytecodes::_ifge: | |
738 case Bytecodes::_ifgt: | |
739 case Bytecodes::_ifle: | |
740 { | |
741 state.spop(); | |
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::_if_icmpeq: | |
749 case Bytecodes::_if_icmpne: | |
750 case Bytecodes::_if_icmplt: | |
751 case Bytecodes::_if_icmpge: | |
752 case Bytecodes::_if_icmpgt: | |
753 case Bytecodes::_if_icmple: | |
754 { | |
755 state.spop(); | |
756 state.spop(); | |
757 int dest_bci = s.get_dest(); | |
758 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
759 assert(s.next_bci() == limit_bci, "branch must end block"); | |
760 successors.push(_methodBlocks->block_containing(dest_bci)); | |
761 break; | |
762 } | |
763 case Bytecodes::_if_acmpeq: | |
764 case Bytecodes::_if_acmpne: | |
765 { | |
766 set_method_escape(state.apop()); | |
767 set_method_escape(state.apop()); | |
768 int dest_bci = s.get_dest(); | |
769 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
770 assert(s.next_bci() == limit_bci, "branch must end block"); | |
771 successors.push(_methodBlocks->block_containing(dest_bci)); | |
772 break; | |
773 } | |
774 case Bytecodes::_goto: | |
775 { | |
776 int dest_bci = s.get_dest(); | |
777 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
778 assert(s.next_bci() == limit_bci, "branch must end block"); | |
779 successors.push(_methodBlocks->block_containing(dest_bci)); | |
780 fall_through = false; | |
781 break; | |
782 } | |
783 case Bytecodes::_jsr: | |
784 { | |
785 int dest_bci = s.get_dest(); | |
786 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
787 assert(s.next_bci() == limit_bci, "branch must end block"); | |
788 state.apush(empty_map); | |
789 successors.push(_methodBlocks->block_containing(dest_bci)); | |
790 fall_through = false; | |
791 break; | |
792 } | |
793 case Bytecodes::_ret: | |
794 // we don't track the destination of a "ret" instruction | |
795 assert(s.next_bci() == limit_bci, "branch must end block"); | |
796 fall_through = false; | |
797 break; | |
798 case Bytecodes::_return: | |
799 assert(s.next_bci() == limit_bci, "return must end block"); | |
800 fall_through = false; | |
801 break; | |
802 case Bytecodes::_tableswitch: | |
803 { | |
804 state.spop(); | |
2142 | 805 Bytecode_tableswitch sw(&s); |
806 int len = sw.length(); | |
0 | 807 int dest_bci; |
808 for (int i = 0; i < len; i++) { | |
2142 | 809 dest_bci = s.cur_bci() + sw.dest_offset_at(i); |
0 | 810 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
811 successors.push(_methodBlocks->block_containing(dest_bci)); | |
812 } | |
2142 | 813 dest_bci = s.cur_bci() + sw.default_offset(); |
0 | 814 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
815 successors.push(_methodBlocks->block_containing(dest_bci)); | |
816 assert(s.next_bci() == limit_bci, "branch must end block"); | |
817 fall_through = false; | |
818 break; | |
819 } | |
820 case Bytecodes::_lookupswitch: | |
821 { | |
822 state.spop(); | |
2142 | 823 Bytecode_lookupswitch sw(&s); |
824 int len = sw.number_of_pairs(); | |
0 | 825 int dest_bci; |
826 for (int i = 0; i < len; i++) { | |
2142 | 827 dest_bci = s.cur_bci() + sw.pair_at(i).offset(); |
0 | 828 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
829 successors.push(_methodBlocks->block_containing(dest_bci)); | |
830 } | |
2142 | 831 dest_bci = s.cur_bci() + sw.default_offset(); |
0 | 832 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); |
833 successors.push(_methodBlocks->block_containing(dest_bci)); | |
834 fall_through = false; | |
835 break; | |
836 } | |
837 case Bytecodes::_ireturn: | |
838 case Bytecodes::_freturn: | |
839 state.spop(); | |
840 fall_through = false; | |
841 break; | |
842 case Bytecodes::_lreturn: | |
843 case Bytecodes::_dreturn: | |
844 state.lpop(); | |
845 fall_through = false; | |
846 break; | |
847 case Bytecodes::_areturn: | |
848 set_returned(state.apop()); | |
849 fall_through = false; | |
850 break; | |
851 case Bytecodes::_getstatic: | |
852 case Bytecodes::_getfield: | |
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853 { bool ignored_will_link; |
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854 ciField* field = s.get_field(ignored_will_link); |
0 | 855 BasicType field_type = field->type()->basic_type(); |
856 if (s.cur_bc() != Bytecodes::_getstatic) { | |
857 set_method_escape(state.apop()); | |
858 } | |
859 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
860 state.apush(unknown_obj); | |
861 } else if (type2size[field_type] == 1) { | |
862 state.spush(); | |
863 } else { | |
864 state.lpush(); | |
865 } | |
866 } | |
867 break; | |
868 case Bytecodes::_putstatic: | |
869 case Bytecodes::_putfield: | |
870 { bool will_link; | |
871 ciField* field = s.get_field(will_link); | |
872 BasicType field_type = field->type()->basic_type(); | |
873 if (field_type == T_OBJECT || field_type == T_ARRAY) { | |
874 set_global_escape(state.apop()); | |
875 } else if (type2size[field_type] == 1) { | |
876 state.spop(); | |
877 } else { | |
878 state.lpop(); | |
879 } | |
880 if (s.cur_bc() != Bytecodes::_putstatic) { | |
881 ArgumentMap p = state.apop(); | |
882 set_method_escape(p); | |
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883 set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize); |
0 | 884 } |
885 } | |
886 break; | |
887 case Bytecodes::_invokevirtual: | |
888 case Bytecodes::_invokespecial: | |
889 case Bytecodes::_invokestatic: | |
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890 case Bytecodes::_invokedynamic: |
0 | 891 case Bytecodes::_invokeinterface: |
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892 { bool ignored_will_link; |
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893 ciSignature* declared_signature = NULL; |
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894 ciMethod* target = s.get_method(ignored_will_link, &declared_signature); |
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895 ciKlass* holder = s.get_declared_method_holder(); |
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896 assert(declared_signature != NULL, "cannot be null"); |
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897 // Push appendix argument, if one. |
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898 if (s.has_appendix()) { |
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899 state.apush(unknown_obj); |
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900 } |
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901 // Pass in raw bytecode because we need to see invokehandle instructions. |
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902 invoke(state, s.cur_bc_raw(), target, holder); |
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903 // We are using the return type of the declared signature here because |
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904 // it might be a more concrete type than the one from the target (for |
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905 // e.g. invokedynamic and invokehandle). |
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906 ciType* return_type = declared_signature->return_type(); |
0 | 907 if (!return_type->is_primitive_type()) { |
908 state.apush(unknown_obj); | |
909 } else if (return_type->is_one_word()) { | |
910 state.spush(); | |
911 } else if (return_type->is_two_word()) { | |
912 state.lpush(); | |
913 } | |
914 } | |
915 break; | |
916 case Bytecodes::_new: | |
917 state.apush(allocated_obj); | |
918 break; | |
919 case Bytecodes::_newarray: | |
920 case Bytecodes::_anewarray: | |
921 state.spop(); | |
922 state.apush(allocated_obj); | |
923 break; | |
924 case Bytecodes::_multianewarray: | |
925 { int i = s.cur_bcp()[3]; | |
926 while (i-- > 0) state.spop(); | |
927 state.apush(allocated_obj); | |
928 } | |
929 break; | |
930 case Bytecodes::_arraylength: | |
931 set_method_escape(state.apop()); | |
932 state.spush(); | |
933 break; | |
934 case Bytecodes::_athrow: | |
935 set_global_escape(state.apop()); | |
936 fall_through = false; | |
937 break; | |
938 case Bytecodes::_checkcast: | |
939 { ArgumentMap obj = state.apop(); | |
940 set_method_escape(obj); | |
941 state.apush(obj); | |
942 } | |
943 break; | |
944 case Bytecodes::_instanceof: | |
945 set_method_escape(state.apop()); | |
946 state.spush(); | |
947 break; | |
948 case Bytecodes::_monitorenter: | |
949 case Bytecodes::_monitorexit: | |
950 state.apop(); | |
951 break; | |
952 case Bytecodes::_wide: | |
953 ShouldNotReachHere(); | |
954 break; | |
955 case Bytecodes::_ifnull: | |
956 case Bytecodes::_ifnonnull: | |
957 { | |
958 set_method_escape(state.apop()); | |
959 int dest_bci = s.get_dest(); | |
960 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
961 assert(s.next_bci() == limit_bci, "branch must end block"); | |
962 successors.push(_methodBlocks->block_containing(dest_bci)); | |
963 break; | |
964 } | |
965 case Bytecodes::_goto_w: | |
966 { | |
967 int dest_bci = s.get_far_dest(); | |
968 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
969 assert(s.next_bci() == limit_bci, "branch must end block"); | |
970 successors.push(_methodBlocks->block_containing(dest_bci)); | |
971 fall_through = false; | |
972 break; | |
973 } | |
974 case Bytecodes::_jsr_w: | |
975 { | |
976 int dest_bci = s.get_far_dest(); | |
977 assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block"); | |
978 assert(s.next_bci() == limit_bci, "branch must end block"); | |
979 state.apush(empty_map); | |
980 successors.push(_methodBlocks->block_containing(dest_bci)); | |
981 fall_through = false; | |
982 break; | |
983 } | |
984 case Bytecodes::_breakpoint: | |
985 break; | |
986 default: | |
987 ShouldNotReachHere(); | |
988 break; | |
989 } | |
990 | |
991 } | |
992 if (fall_through) { | |
993 int fall_through_bci = s.cur_bci(); | |
994 if (fall_through_bci < _method->code_size()) { | |
995 assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start."); | |
996 successors.push(_methodBlocks->block_containing(fall_through_bci)); | |
997 } | |
998 } | |
999 } | |
1000 | |
1001 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) { | |
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1002 StateInfo *d_state = blockstates + dest->index(); |
0 | 1003 int nlocals = _method->max_locals(); |
1004 | |
1005 // exceptions may cause transfer of control to handlers in the middle of a | |
1006 // block, so we don't merge the incoming state of exception handlers | |
1007 if (dest->is_handler()) | |
1008 return; | |
1009 if (!d_state->_initialized ) { | |
1010 // destination not initialized, just copy | |
1011 for (int i = 0; i < nlocals; i++) { | |
1012 d_state->_vars[i] = s_state->_vars[i]; | |
1013 } | |
1014 for (int i = 0; i < s_state->_stack_height; i++) { | |
1015 d_state->_stack[i] = s_state->_stack[i]; | |
1016 } | |
1017 d_state->_stack_height = s_state->_stack_height; | |
1018 d_state->_max_stack = s_state->_max_stack; | |
1019 d_state->_initialized = true; | |
1020 } else if (!dest->processed()) { | |
1021 // we have not yet walked the bytecodes of dest, we can merge | |
1022 // the states | |
1023 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
1024 for (int i = 0; i < nlocals; i++) { | |
1025 d_state->_vars[i].set_union(s_state->_vars[i]); | |
1026 } | |
1027 for (int i = 0; i < s_state->_stack_height; i++) { | |
1028 d_state->_stack[i].set_union(s_state->_stack[i]); | |
1029 } | |
1030 } else { | |
1031 // the bytecodes of dest have already been processed, mark any | |
1032 // arguments in the source state which are not in the dest state | |
1033 // as global escape. | |
1034 // Future refinement: we only need to mark these variable to the | |
1035 // maximum escape of any variables in dest state | |
1036 assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match"); | |
1037 ArgumentMap extra_vars; | |
1038 for (int i = 0; i < nlocals; i++) { | |
1039 ArgumentMap t; | |
1040 t = s_state->_vars[i]; | |
1041 t.set_difference(d_state->_vars[i]); | |
1042 extra_vars.set_union(t); | |
1043 } | |
1044 for (int i = 0; i < s_state->_stack_height; i++) { | |
1045 ArgumentMap t; | |
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1046 //extra_vars |= !d_state->_vars[i] & s_state->_vars[i]; |
0 | 1047 t.clear(); |
1048 t = s_state->_stack[i]; | |
1049 t.set_difference(d_state->_stack[i]); | |
1050 extra_vars.set_union(t); | |
1051 } | |
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1052 set_global_escape(extra_vars, true); |
0 | 1053 } |
1054 } | |
1055 | |
1056 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) { | |
1057 int numblocks = _methodBlocks->num_blocks(); | |
1058 int stkSize = _method->max_stack(); | |
1059 int numLocals = _method->max_locals(); | |
1060 StateInfo state; | |
1061 | |
1062 int datacount = (numblocks + 1) * (stkSize + numLocals); | |
1063 int datasize = datacount * sizeof(ArgumentMap); | |
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1064 StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo)); |
0 | 1065 ArgumentMap *statedata = (ArgumentMap *) arena->Amalloc(datasize); |
1066 for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap(); | |
1067 ArgumentMap *dp = statedata; | |
1068 state._vars = dp; | |
1069 dp += numLocals; | |
1070 state._stack = dp; | |
1071 dp += stkSize; | |
1072 state._initialized = false; | |
1073 state._max_stack = stkSize; | |
1074 for (int i = 0; i < numblocks; i++) { | |
1075 blockstates[i]._vars = dp; | |
1076 dp += numLocals; | |
1077 blockstates[i]._stack = dp; | |
1078 dp += stkSize; | |
1079 blockstates[i]._initialized = false; | |
1080 blockstates[i]._stack_height = 0; | |
1081 blockstates[i]._max_stack = stkSize; | |
1082 } | |
1083 GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL); | |
1084 GrowableArray<ciBlock *> successors(arena, 4, 0, NULL); | |
1085 | |
1086 _methodBlocks->clear_processed(); | |
1087 | |
1088 // initialize block 0 state from method signature | |
1089 ArgumentMap allVars; // all oop arguments to method | |
1090 ciSignature* sig = method()->signature(); | |
1091 int j = 0; | |
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1092 ciBlock* first_blk = _methodBlocks->block_containing(0); |
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1093 int fb_i = first_blk->index(); |
0 | 1094 if (!method()->is_static()) { |
1095 // record information for "this" | |
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1096 blockstates[fb_i]._vars[j].set(j); |
0 | 1097 allVars.add(j); |
1098 j++; | |
1099 } | |
1100 for (int i = 0; i < sig->count(); i++) { | |
1101 ciType* t = sig->type_at(i); | |
1102 if (!t->is_primitive_type()) { | |
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1103 blockstates[fb_i]._vars[j].set(j); |
0 | 1104 allVars.add(j); |
1105 } | |
1106 j += t->size(); | |
1107 } | |
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1108 blockstates[fb_i]._initialized = true; |
0 | 1109 assert(j == _arg_size, "just checking"); |
1110 | |
1111 ArgumentMap unknown_map; | |
1112 unknown_map.add_unknown(); | |
1113 | |
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1114 worklist.push(first_blk); |
0 | 1115 while(worklist.length() > 0) { |
1116 ciBlock *blk = worklist.pop(); | |
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1117 StateInfo *blkState = blockstates + blk->index(); |
0 | 1118 if (blk->is_handler() || blk->is_ret_target()) { |
1119 // for an exception handler or a target of a ret instruction, we assume the worst case, | |
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1120 // that any variable could contain any argument |
0 | 1121 for (int i = 0; i < numLocals; i++) { |
1122 state._vars[i] = allVars; | |
1123 } | |
1124 if (blk->is_handler()) { | |
1125 state._stack_height = 1; | |
1126 } else { | |
1127 state._stack_height = blkState->_stack_height; | |
1128 } | |
1129 for (int i = 0; i < state._stack_height; i++) { | |
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1130 // ??? should this be unknown_map ??? |
0 | 1131 state._stack[i] = allVars; |
1132 } | |
1133 } else { | |
1134 for (int i = 0; i < numLocals; i++) { | |
1135 state._vars[i] = blkState->_vars[i]; | |
1136 } | |
1137 for (int i = 0; i < blkState->_stack_height; i++) { | |
1138 state._stack[i] = blkState->_stack[i]; | |
1139 } | |
1140 state._stack_height = blkState->_stack_height; | |
1141 } | |
1142 iterate_one_block(blk, state, successors); | |
1143 // if this block has any exception handlers, push them | |
1144 // onto successor list | |
1145 if (blk->has_handler()) { | |
1146 DEBUG_ONLY(int handler_count = 0;) | |
1147 int blk_start = blk->start_bci(); | |
1148 int blk_end = blk->limit_bci(); | |
1149 for (int i = 0; i < numblocks; i++) { | |
1150 ciBlock *b = _methodBlocks->block(i); | |
1151 if (b->is_handler()) { | |
1152 int ex_start = b->ex_start_bci(); | |
1153 int ex_end = b->ex_limit_bci(); | |
1154 if ((ex_start >= blk_start && ex_start < blk_end) || | |
1155 (ex_end > blk_start && ex_end <= blk_end)) { | |
1156 successors.push(b); | |
1157 } | |
1158 DEBUG_ONLY(handler_count++;) | |
1159 } | |
1160 } | |
1161 assert(handler_count > 0, "must find at least one handler"); | |
1162 } | |
1163 // merge computed variable state with successors | |
1164 while(successors.length() > 0) { | |
1165 ciBlock *succ = successors.pop(); | |
1166 merge_block_states(blockstates, succ, &state); | |
1167 if (!succ->processed()) | |
1168 worklist.push(succ); | |
1169 } | |
1170 } | |
1171 } | |
1172 | |
1173 bool BCEscapeAnalyzer::do_analysis() { | |
1174 Arena* arena = CURRENT_ENV->arena(); | |
1175 // identify basic blocks | |
1176 _methodBlocks = _method->get_method_blocks(); | |
1177 | |
1178 iterate_blocks(arena); | |
1179 // TEMPORARY | |
1180 return true; | |
1181 } | |
1182 | |
1183 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() { | |
1184 vmIntrinsics::ID iid = method()->intrinsic_id(); | |
1185 | |
1186 if (iid == vmIntrinsics::_getClass || | |
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1187 iid == vmIntrinsics::_fillInStackTrace || |
0 | 1188 iid == vmIntrinsics::_hashCode) |
1189 return iid; | |
1190 else | |
1191 return vmIntrinsics::_none; | |
1192 } | |
1193 | |
1194 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) { | |
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1195 ArgumentMap arg; |
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1196 arg.clear(); |
0 | 1197 switch (iid) { |
1198 case vmIntrinsics::_getClass: | |
1199 _return_local = false; | |
1200 break; | |
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1201 case vmIntrinsics::_fillInStackTrace: |
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1202 arg.set(0); // 'this' |
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1203 set_returned(arg); |
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1204 break; |
0 | 1205 case vmIntrinsics::_hashCode: |
1206 // initialized state is correct | |
1207 break; | |
1208 default: | |
1209 assert(false, "unexpected intrinsic"); | |
1210 } | |
1211 return true; | |
1212 } | |
1213 | |
1214 void BCEscapeAnalyzer::initialize() { | |
1215 int i; | |
1216 | |
1217 // clear escape information (method may have been deoptimized) | |
1218 methodData()->clear_escape_info(); | |
1219 | |
1220 // initialize escape state of object parameters | |
1221 ciSignature* sig = method()->signature(); | |
1222 int j = 0; | |
1223 if (!method()->is_static()) { | |
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1224 _arg_local.set(0); |
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1225 _arg_stack.set(0); |
0 | 1226 j++; |
1227 } | |
1228 for (i = 0; i < sig->count(); i++) { | |
1229 ciType* t = sig->type_at(i); | |
1230 if (!t->is_primitive_type()) { | |
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1231 _arg_local.set(j); |
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1232 _arg_stack.set(j); |
0 | 1233 } |
1234 j += t->size(); | |
1235 } | |
1236 assert(j == _arg_size, "just checking"); | |
1237 | |
1238 // start with optimistic assumption | |
1239 ciType *rt = _method->return_type(); | |
1240 if (rt->is_primitive_type()) { | |
1241 _return_local = false; | |
1242 _return_allocated = false; | |
1243 } else { | |
1244 _return_local = true; | |
1245 _return_allocated = true; | |
1246 } | |
1247 _allocated_escapes = false; | |
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1248 _unknown_modified = false; |
0 | 1249 } |
1250 | |
1251 void BCEscapeAnalyzer::clear_escape_info() { | |
1252 ciSignature* sig = method()->signature(); | |
1253 int arg_count = sig->count(); | |
1254 ArgumentMap var; | |
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1255 if (!method()->is_static()) { |
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1256 arg_count++; // allow for "this" |
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1257 } |
0 | 1258 for (int i = 0; i < arg_count; i++) { |
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1259 set_arg_modified(i, OFFSET_ANY, 4); |
0 | 1260 var.clear(); |
1261 var.set(i); | |
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1262 set_modified(var, OFFSET_ANY, 4); |
0 | 1263 set_global_escape(var); |
1264 } | |
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1265 _arg_local.Clear(); |
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1266 _arg_stack.Clear(); |
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1267 _arg_returned.Clear(); |
0 | 1268 _return_local = false; |
1269 _return_allocated = false; | |
1270 _allocated_escapes = true; | |
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1271 _unknown_modified = true; |
0 | 1272 } |
1273 | |
1274 | |
1275 void BCEscapeAnalyzer::compute_escape_info() { | |
1276 int i; | |
1277 assert(!methodData()->has_escape_info(), "do not overwrite escape info"); | |
1278 | |
1279 vmIntrinsics::ID iid = known_intrinsic(); | |
1280 | |
1281 // check if method can be analyzed | |
1282 if (iid == vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized() | |
1283 || _level > MaxBCEAEstimateLevel | |
1284 || method()->code_size() > MaxBCEAEstimateSize)) { | |
1285 if (BCEATraceLevel >= 1) { | |
1286 tty->print("Skipping method because: "); | |
1287 if (method()->is_abstract()) | |
1288 tty->print_cr("method is abstract."); | |
1289 else if (method()->is_native()) | |
1290 tty->print_cr("method is native."); | |
1291 else if (!method()->holder()->is_initialized()) | |
1292 tty->print_cr("class of method is not initialized."); | |
1293 else if (_level > MaxBCEAEstimateLevel) | |
1294 tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).", | |
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1295 _level, (int) MaxBCEAEstimateLevel); |
0 | 1296 else if (method()->code_size() > MaxBCEAEstimateSize) |
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1297 tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize (%d).", |
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1298 method()->code_size(), (int) MaxBCEAEstimateSize); |
0 | 1299 else |
1300 ShouldNotReachHere(); | |
1301 } | |
1302 clear_escape_info(); | |
1303 | |
1304 return; | |
1305 } | |
1306 | |
1307 if (BCEATraceLevel >= 1) { | |
1308 tty->print("[EA] estimating escape information for"); | |
1309 if (iid != vmIntrinsics::_none) | |
1310 tty->print(" intrinsic"); | |
1311 method()->print_short_name(); | |
1312 tty->print_cr(" (%d bytes)", method()->code_size()); | |
1313 } | |
1314 | |
1315 bool success; | |
1316 | |
1317 initialize(); | |
1318 | |
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1319 // Do not scan method if it has no object parameters and |
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1320 // does not returns an object (_return_allocated is set in initialize()). |
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1321 if (_arg_local.Size() == 0 && !_return_allocated) { |
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1322 // Clear all info since method's bytecode was not analysed and |
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1323 // set pessimistic escape information. |
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1324 clear_escape_info(); |
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1325 methodData()->set_eflag(MethodData::allocated_escapes); |
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1326 methodData()->set_eflag(MethodData::unknown_modified); |
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1327 methodData()->set_eflag(MethodData::estimated); |
0 | 1328 return; |
1329 } | |
1330 | |
1331 if (iid != vmIntrinsics::_none) | |
1332 success = compute_escape_for_intrinsic(iid); | |
1333 else { | |
1334 success = do_analysis(); | |
1335 } | |
1336 | |
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1337 // don't store interprocedural escape information if it introduces |
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1338 // dependencies or if method data is empty |
0 | 1339 // |
1340 if (!has_dependencies() && !methodData()->is_empty()) { | |
1341 for (i = 0; i < _arg_size; i++) { | |
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1342 if (_arg_local.test(i)) { |
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1343 assert(_arg_stack.test(i), "inconsistent escape info"); |
0 | 1344 methodData()->set_arg_local(i); |
1345 methodData()->set_arg_stack(i); | |
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1346 } else if (_arg_stack.test(i)) { |
0 | 1347 methodData()->set_arg_stack(i); |
1348 } | |
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1349 if (_arg_returned.test(i)) { |
0 | 1350 methodData()->set_arg_returned(i); |
1351 } | |
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1352 methodData()->set_arg_modified(i, _arg_modified[i]); |
0 | 1353 } |
1354 if (_return_local) { | |
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1355 methodData()->set_eflag(MethodData::return_local); |
0 | 1356 } |
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1357 if (_return_allocated) { |
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1358 methodData()->set_eflag(MethodData::return_allocated); |
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1359 } |
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1360 if (_allocated_escapes) { |
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1361 methodData()->set_eflag(MethodData::allocated_escapes); |
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1362 } |
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1363 if (_unknown_modified) { |
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1364 methodData()->set_eflag(MethodData::unknown_modified); |
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1365 } |
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1366 methodData()->set_eflag(MethodData::estimated); |
0 | 1367 } |
1368 } | |
1369 | |
1370 void BCEscapeAnalyzer::read_escape_info() { | |
1371 assert(methodData()->has_escape_info(), "no escape info available"); | |
1372 | |
1373 // read escape information from method descriptor | |
1374 for (int i = 0; i < _arg_size; i++) { | |
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1375 if (methodData()->is_arg_local(i)) |
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1376 _arg_local.set(i); |
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1377 if (methodData()->is_arg_stack(i)) |
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1378 _arg_stack.set(i); |
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1379 if (methodData()->is_arg_returned(i)) |
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1380 _arg_returned.set(i); |
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1381 _arg_modified[i] = methodData()->arg_modified(i); |
0 | 1382 } |
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1383 _return_local = methodData()->eflag_set(MethodData::return_local); |
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1384 _return_allocated = methodData()->eflag_set(MethodData::return_allocated); |
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1385 _allocated_escapes = methodData()->eflag_set(MethodData::allocated_escapes); |
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1386 _unknown_modified = methodData()->eflag_set(MethodData::unknown_modified); |
0 | 1387 |
1388 } | |
1389 | |
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1390 #ifndef PRODUCT |
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1391 void BCEscapeAnalyzer::dump() { |
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1392 tty->print("[EA] estimated escape information for"); |
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1393 method()->print_short_name(); |
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1394 tty->print_cr(has_dependencies() ? " (not stored)" : ""); |
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1395 tty->print(" non-escaping args: "); |
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1396 _arg_local.print_on(tty); |
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1397 tty->print(" stack-allocatable args: "); |
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1398 _arg_stack.print_on(tty); |
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1399 if (_return_local) { |
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1400 tty->print(" returned args: "); |
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1401 _arg_returned.print_on(tty); |
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1402 } else if (is_return_allocated()) { |
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1403 tty->print_cr(" return allocated value"); |
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1404 } else { |
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1405 tty->print_cr(" return non-local value"); |
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1406 } |
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1407 tty->print(" modified args: "); |
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1408 for (int i = 0; i < _arg_size; i++) { |
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1409 if (_arg_modified[i] == 0) |
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1410 tty->print(" 0"); |
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1411 else |
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1412 tty->print(" 0x%x", _arg_modified[i]); |
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1413 } |
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1414 tty->cr(); |
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1415 tty->print(" flags: "); |
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1416 if (_return_allocated) |
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1417 tty->print(" return_allocated"); |
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1418 if (_allocated_escapes) |
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1419 tty->print(" allocated_escapes"); |
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1420 if (_unknown_modified) |
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1421 tty->print(" unknown_modified"); |
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1422 tty->cr(); |
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1423 } |
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1424 #endif |
0 | 1425 |
1426 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent) | |
1427 : _conservative(method == NULL || !EstimateArgEscape) | |
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1428 , _arena(CURRENT_ENV->arena()) |
0 | 1429 , _method(method) |
1430 , _methodData(method ? method->method_data() : NULL) | |
1431 , _arg_size(method ? method->arg_size() : 0) | |
1648
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1432 , _arg_local(_arena) |
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1433 , _arg_stack(_arena) |
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1434 , _arg_returned(_arena) |
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1435 , _dirty(_arena) |
0 | 1436 , _return_local(false) |
1437 , _return_allocated(false) | |
1438 , _allocated_escapes(false) | |
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1439 , _unknown_modified(false) |
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1440 , _dependencies(_arena, 4, 0, NULL) |
0 | 1441 , _parent(parent) |
1442 , _level(parent == NULL ? 0 : parent->level() + 1) { | |
1443 if (!_conservative) { | |
1648
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1444 _arg_local.Clear(); |
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1445 _arg_stack.Clear(); |
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1446 _arg_returned.Clear(); |
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1447 _dirty.Clear(); |
0 | 1448 Arena* arena = CURRENT_ENV->arena(); |
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1449 _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint)); |
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1450 Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint)); |
0 | 1451 |
1452 if (methodData() == NULL) | |
1453 return; | |
1454 bool printit = _method->should_print_assembly(); | |
1455 if (methodData()->has_escape_info()) { | |
1456 TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s", | |
1457 method->holder()->name()->as_utf8(), | |
1458 method->name()->as_utf8())); | |
1459 read_escape_info(); | |
1460 } else { | |
1461 TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s", | |
1462 method->holder()->name()->as_utf8(), | |
1463 method->name()->as_utf8())); | |
1464 | |
1465 compute_escape_info(); | |
1466 methodData()->update_escape_info(); | |
1467 } | |
78
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1468 #ifndef PRODUCT |
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1469 if (BCEATraceLevel >= 3) { |
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1470 // dump escape information |
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1471 dump(); |
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1472 } |
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1473 #endif |
0 | 1474 } |
1475 } | |
1476 | |
1477 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) { | |
1397
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1478 if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) { |
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1479 // Also record evol dependencies so redefinition of the |
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1480 // callee will trigger recompilation. |
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1481 deps->assert_evol_method(method()); |
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1482 } |
0 | 1483 for (int i = 0; i < _dependencies.length(); i+=2) { |
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1484 ciKlass *k = _dependencies.at(i)->as_klass(); |
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1485 ciMethod *m = _dependencies.at(i+1)->as_method(); |
0 | 1486 deps->assert_unique_concrete_method(k, m); |
1487 } | |
1488 } |