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annotate src/share/vm/c1/c1_ValueStack.hpp @ 5251:467de393651a
optimization: frame prologue & epilogue ommitted for methods with no spills, no callee-saved registers, no incoming stack args and no debug info
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 18 Apr 2012 23:39:07 +0200 |
parents | f95d63e2154a |
children | 1d7922586cf6 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1999, 2010, 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 #ifndef SHARE_VM_C1_C1_VALUESTACK_HPP |
26 #define SHARE_VM_C1_C1_VALUESTACK_HPP | |
27 | |
28 #include "c1/c1_Instruction.hpp" | |
29 | |
0 | 30 class ValueStack: public CompilationResourceObj { |
1819 | 31 public: |
32 enum Kind { | |
33 Parsing, // During abstract interpretation in GraphBuilder | |
34 CallerState, // Caller state when inlining | |
35 StateBefore, // Before before execution of instruction | |
36 StateAfter, // After execution of instruction | |
37 ExceptionState, // Exception handling of instruction | |
38 EmptyExceptionState, // Exception handling of instructions not covered by an xhandler | |
39 BlockBeginState // State of BlockBegin instruction with phi functions of this block | |
40 }; | |
41 | |
0 | 42 private: |
43 IRScope* _scope; // the enclosing scope | |
1819 | 44 ValueStack* _caller_state; |
45 int _bci; | |
46 Kind _kind; | |
47 | |
0 | 48 Values _locals; // the locals |
49 Values _stack; // the expression stack | |
50 Values _locks; // the monitor stack (holding the locked values) | |
51 | |
52 Value check(ValueTag tag, Value t) { | |
53 assert(tag == t->type()->tag() || tag == objectTag && t->type()->tag() == addressTag, "types must correspond"); | |
54 return t; | |
55 } | |
56 | |
57 Value check(ValueTag tag, Value t, Value h) { | |
1819 | 58 assert(h == NULL, "hi-word of doubleword value must be NULL"); |
0 | 59 return check(tag, t); |
60 } | |
61 | |
62 // helper routine | |
1584 | 63 static void apply(Values list, ValueVisitor* f); |
0 | 64 |
1819 | 65 // for simplified copying |
66 ValueStack(ValueStack* copy_from, Kind kind, int bci); | |
67 | |
0 | 68 public: |
69 // creation | |
1819 | 70 ValueStack(IRScope* scope, ValueStack* caller_state); |
0 | 71 |
1819 | 72 ValueStack* copy() { return new ValueStack(this, _kind, _bci); } |
73 ValueStack* copy(Kind new_kind, int new_bci) { return new ValueStack(this, new_kind, new_bci); } | |
74 ValueStack* copy_for_parsing() { return new ValueStack(this, Parsing, -99); } | |
75 | |
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76 void set_caller_state(ValueStack* s) { |
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77 assert(kind() == EmptyExceptionState || |
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78 (Compilation::current()->env()->jvmti_can_access_local_variables() && kind() == ExceptionState), |
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79 "only EmptyExceptionStates can be modified"); |
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80 _caller_state = s; |
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81 } |
1819 | 82 |
0 | 83 bool is_same(ValueStack* s); // returns true if this & s's types match (w/o checking locals) |
84 | |
85 // accessors | |
86 IRScope* scope() const { return _scope; } | |
1819 | 87 ValueStack* caller_state() const { return _caller_state; } |
88 int bci() const { return _bci; } | |
89 Kind kind() const { return _kind; } | |
90 | |
0 | 91 int locals_size() const { return _locals.length(); } |
92 int stack_size() const { return _stack.length(); } | |
93 int locks_size() const { return _locks.length(); } | |
94 bool stack_is_empty() const { return _stack.is_empty(); } | |
95 bool no_active_locks() const { return _locks.is_empty(); } | |
1819 | 96 int total_locks_size() const; |
0 | 97 |
98 // locals access | |
99 void clear_locals(); // sets all locals to NULL; | |
100 | |
101 void invalidate_local(int i) { | |
1819 | 102 assert(_locals.at(i)->type()->is_single_word() || |
103 _locals.at(i + 1) == NULL, "hi-word of doubleword value must be NULL"); | |
0 | 104 _locals.at_put(i, NULL); |
105 } | |
106 | |
1819 | 107 Value local_at(int i) const { |
0 | 108 Value x = _locals.at(i); |
1819 | 109 assert(x == NULL || x->type()->is_single_word() || |
110 _locals.at(i + 1) == NULL, "hi-word of doubleword value must be NULL"); | |
0 | 111 return x; |
112 } | |
113 | |
114 void store_local(int i, Value x) { | |
1819 | 115 // When overwriting local i, check if i - 1 was the start of a |
116 // double word local and kill it. | |
0 | 117 if (i > 0) { |
118 Value prev = _locals.at(i - 1); | |
119 if (prev != NULL && prev->type()->is_double_word()) { | |
120 _locals.at_put(i - 1, NULL); | |
121 } | |
122 } | |
1819 | 123 |
124 _locals.at_put(i, x); | |
125 if (x->type()->is_double_word()) { | |
126 // hi-word of doubleword value is always NULL | |
127 _locals.at_put(i + 1, NULL); | |
128 } | |
0 | 129 } |
130 | |
131 // stack access | |
132 Value stack_at(int i) const { | |
133 Value x = _stack.at(i); | |
134 assert(x->type()->is_single_word() || | |
1819 | 135 _stack.at(i + 1) == NULL, "hi-word of doubleword value must be NULL"); |
0 | 136 return x; |
137 } | |
138 | |
139 Value stack_at_inc(int& i) const { | |
140 Value x = stack_at(i); | |
141 i += x->type()->size(); | |
142 return x; | |
143 } | |
144 | |
145 // pinning support | |
146 void pin_stack_for_linear_scan(); | |
147 | |
148 // iteration | |
1584 | 149 void values_do(ValueVisitor* f); |
0 | 150 |
151 // untyped manipulation (for dup_x1, etc.) | |
152 void truncate_stack(int size) { _stack.trunc_to(size); } | |
153 void raw_push(Value t) { _stack.push(t); } | |
154 Value raw_pop() { return _stack.pop(); } | |
155 | |
156 // typed manipulation | |
157 void ipush(Value t) { _stack.push(check(intTag , t)); } | |
158 void fpush(Value t) { _stack.push(check(floatTag , t)); } | |
159 void apush(Value t) { _stack.push(check(objectTag , t)); } | |
160 void rpush(Value t) { _stack.push(check(addressTag, t)); } | |
161 void lpush(Value t) { _stack.push(check(longTag , t)); _stack.push(NULL); } | |
162 void dpush(Value t) { _stack.push(check(doubleTag , t)); _stack.push(NULL); } | |
163 | |
164 void push(ValueType* type, Value t) { | |
165 switch (type->tag()) { | |
166 case intTag : ipush(t); return; | |
167 case longTag : lpush(t); return; | |
168 case floatTag : fpush(t); return; | |
169 case doubleTag : dpush(t); return; | |
170 case objectTag : apush(t); return; | |
171 case addressTag: rpush(t); return; | |
172 } | |
173 ShouldNotReachHere(); | |
174 } | |
175 | |
176 Value ipop() { return check(intTag , _stack.pop()); } | |
177 Value fpop() { return check(floatTag , _stack.pop()); } | |
178 Value apop() { return check(objectTag , _stack.pop()); } | |
179 Value rpop() { return check(addressTag, _stack.pop()); } | |
180 Value lpop() { Value h = _stack.pop(); return check(longTag , _stack.pop(), h); } | |
181 Value dpop() { Value h = _stack.pop(); return check(doubleTag, _stack.pop(), h); } | |
182 | |
183 Value pop(ValueType* type) { | |
184 switch (type->tag()) { | |
185 case intTag : return ipop(); | |
186 case longTag : return lpop(); | |
187 case floatTag : return fpop(); | |
188 case doubleTag : return dpop(); | |
189 case objectTag : return apop(); | |
190 case addressTag: return rpop(); | |
191 } | |
192 ShouldNotReachHere(); | |
193 return NULL; | |
194 } | |
195 | |
196 Values* pop_arguments(int argument_size); | |
197 | |
198 // locks access | |
1819 | 199 int lock (Value obj); |
0 | 200 int unlock(); |
201 Value lock_at(int i) const { return _locks.at(i); } | |
202 | |
203 // SSA form IR support | |
204 void setup_phi_for_stack(BlockBegin* b, int index); | |
205 void setup_phi_for_local(BlockBegin* b, int index); | |
206 | |
207 // debugging | |
208 void print() PRODUCT_RETURN; | |
209 void verify() PRODUCT_RETURN; | |
210 }; | |
211 | |
212 | |
213 | |
214 // Macro definitions for simple iteration of stack and local values of a ValueStack | |
215 // The macros can be used like a for-loop. All variables (state, index and value) | |
216 // must be defined before the loop. | |
217 // When states are nested because of inlining, the stack of the innermost state | |
218 // cumulates also the stack of the nested states. In contrast, the locals of all | |
219 // states must be iterated each. | |
220 // Use the following code pattern to iterate all stack values and all nested local values: | |
221 // | |
222 // ValueStack* state = ... // state that is iterated | |
223 // int index; // current loop index (overwritten in loop) | |
224 // Value value; // value at current loop index (overwritten in loop) | |
225 // | |
226 // for_each_stack_value(state, index, value { | |
227 // do something with value and index | |
228 // } | |
229 // | |
230 // for_each_state(state) { | |
231 // for_each_local_value(state, index, value) { | |
232 // do something with value and index | |
233 // } | |
234 // } | |
235 // as an invariant, state is NULL now | |
236 | |
237 | |
238 // construct a unique variable name with the line number where the macro is used | |
239 #define temp_var3(x) temp__ ## x | |
240 #define temp_var2(x) temp_var3(x) | |
241 #define temp_var temp_var2(__LINE__) | |
242 | |
243 #define for_each_state(state) \ | |
244 for (; state != NULL; state = state->caller_state()) | |
245 | |
246 #define for_each_local_value(state, index, value) \ | |
247 int temp_var = state->locals_size(); \ | |
248 for (index = 0; \ | |
249 index < temp_var && (value = state->local_at(index), true); \ | |
250 index += (value == NULL || value->type()->is_illegal() ? 1 : value->type()->size())) \ | |
251 if (value != NULL) | |
252 | |
253 | |
254 #define for_each_stack_value(state, index, value) \ | |
255 int temp_var = state->stack_size(); \ | |
256 for (index = 0; \ | |
257 index < temp_var && (value = state->stack_at(index), true); \ | |
258 index += value->type()->size()) | |
259 | |
260 | |
261 #define for_each_lock_value(state, index, value) \ | |
262 int temp_var = state->locks_size(); \ | |
263 for (index = 0; \ | |
264 index < temp_var && (value = state->lock_at(index), true); \ | |
265 index++) \ | |
266 if (value != NULL) | |
267 | |
268 | |
269 // Macro definition for simple iteration of all state values of a ValueStack | |
270 // Because the code cannot be executed in a single loop, the code must be passed | |
271 // as a macro parameter. | |
272 // Use the following code pattern to iterate all stack values and all nested local values: | |
273 // | |
274 // ValueStack* state = ... // state that is iterated | |
275 // for_each_state_value(state, value, | |
276 // do something with value (note that this is a macro parameter) | |
277 // ); | |
278 | |
279 #define for_each_state_value(v_state, v_value, v_code) \ | |
280 { \ | |
281 int cur_index; \ | |
282 ValueStack* cur_state = v_state; \ | |
1819 | 283 Value v_value; \ |
284 for_each_state(cur_state) { \ | |
285 { \ | |
286 for_each_local_value(cur_state, cur_index, v_value) { \ | |
287 v_code; \ | |
288 } \ | |
0 | 289 } \ |
1819 | 290 { \ |
291 for_each_stack_value(cur_state, cur_index, v_value) { \ | |
292 v_code; \ | |
293 } \ | |
294 } \ | |
0 | 295 } \ |
296 } | |
297 | |
298 | |
299 // Macro definition for simple iteration of all phif functions of a block, i.e all | |
300 // phi functions of the ValueStack where the block matches. | |
301 // Use the following code pattern to iterate all phi functions of a block: | |
302 // | |
303 // BlockBegin* block = ... // block that is iterated | |
304 // for_each_phi_function(block, phi, | |
305 // do something with the phi function phi (note that this is a macro parameter) | |
306 // ); | |
307 | |
308 #define for_each_phi_fun(v_block, v_phi, v_code) \ | |
309 { \ | |
310 int cur_index; \ | |
311 ValueStack* cur_state = v_block->state(); \ | |
312 Value value; \ | |
313 { \ | |
314 for_each_stack_value(cur_state, cur_index, value) { \ | |
315 Phi* v_phi = value->as_Phi(); \ | |
316 if (v_phi != NULL && v_phi->block() == v_block) { \ | |
317 v_code; \ | |
318 } \ | |
319 } \ | |
320 } \ | |
321 { \ | |
322 for_each_local_value(cur_state, cur_index, value) { \ | |
323 Phi* v_phi = value->as_Phi(); \ | |
324 if (v_phi != NULL && v_phi->block() == v_block) { \ | |
325 v_code; \ | |
326 } \ | |
327 } \ | |
328 } \ | |
329 } | |
1972 | 330 |
331 #endif // SHARE_VM_C1_C1_VALUESTACK_HPP |