1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25 #ifndef SHARE_VM_C1_C1_VALUESTACK_HPP
26 #define SHARE_VM_C1_C1_VALUESTACK_HPP
27
28 #include "c1/c1_Instruction.hpp"
29
30 class ValueStack: public CompilationResourceObj {
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
42 private:
43 IRScope* _scope; // the enclosing scope
44 ValueStack* _caller_state;
45 int _bci;
46 Kind _kind;
47
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) {
58 assert(h == NULL, "hi-word of doubleword value must be NULL");
59 return check(tag, t);
60 }
61
62 // helper routine
63 static void apply(Values list, ValueVisitor* f);
64
65 // for simplified copying
66 ValueStack(ValueStack* copy_from, Kind kind, int bci);
67
68 public:
69 // creation
70 ValueStack(IRScope* scope, ValueStack* caller_state);
71
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
76 void set_caller_state(ValueStack* s) {
77 assert(kind() == EmptyExceptionState ||
78 (Compilation::current()->env()->jvmti_can_access_local_variables() && kind() == ExceptionState),
79 "only EmptyExceptionStates can be modified");
80 _caller_state = s;
81 }
82
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; }
87 ValueStack* caller_state() const { return _caller_state; }
88 int bci() const { return _bci; }
89 Kind kind() const { return _kind; }
90
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(); }
96 int total_locks_size() const;
97
98 // locals access
99 void clear_locals(); // sets all locals to NULL;
100
101 void invalidate_local(int i) {
102 assert(_locals.at(i)->type()->is_single_word() ||
103 _locals.at(i + 1) == NULL, "hi-word of doubleword value must be NULL");
104 _locals.at_put(i, NULL);
105 }
106
107 Value local_at(int i) const {
108 Value x = _locals.at(i);
109 assert(x == NULL || x->type()->is_single_word() ||
110 _locals.at(i + 1) == NULL, "hi-word of doubleword value must be NULL");
111 return x;
112 }
113
114 void store_local(int i, Value x) {
115 // When overwriting local i, check if i - 1 was the start of a
116 // double word local and kill it.
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 }
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 }
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() ||
135 _stack.at(i + 1) == NULL, "hi-word of doubleword value must be NULL");
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 void stack_at_put(int i, Value x) {
146 _stack.at_put(i, x);
147 }
148
149 // pinning support
150 void pin_stack_for_linear_scan();
151
152 // iteration
153 void values_do(ValueVisitor* f);
154
155 // untyped manipulation (for dup_x1, etc.)
156 void truncate_stack(int size) { _stack.trunc_to(size); }
157 void raw_push(Value t) { _stack.push(t); }
158 Value raw_pop() { return _stack.pop(); }
159
160 // typed manipulation
161 void ipush(Value t) { _stack.push(check(intTag , t)); }
162 void fpush(Value t) { _stack.push(check(floatTag , t)); }
163 void apush(Value t) { _stack.push(check(objectTag , t)); }
164 void rpush(Value t) { _stack.push(check(addressTag, t)); }
165 void lpush(Value t) { _stack.push(check(longTag , t)); _stack.push(NULL); }
166 void dpush(Value t) { _stack.push(check(doubleTag , t)); _stack.push(NULL); }
167
168 void push(ValueType* type, Value t) {
169 switch (type->tag()) {
170 case intTag : ipush(t); return;
171 case longTag : lpush(t); return;
172 case floatTag : fpush(t); return;
173 case doubleTag : dpush(t); return;
174 case objectTag : apush(t); return;
175 case addressTag: rpush(t); return;
176 }
177 ShouldNotReachHere();
178 }
179
180 Value ipop() { return check(intTag , _stack.pop()); }
181 Value fpop() { return check(floatTag , _stack.pop()); }
182 Value apop() { return check(objectTag , _stack.pop()); }
183 Value rpop() { return check(addressTag, _stack.pop()); }
184 Value lpop() { Value h = _stack.pop(); return check(longTag , _stack.pop(), h); }
185 Value dpop() { Value h = _stack.pop(); return check(doubleTag, _stack.pop(), h); }
186
187 Value pop(ValueType* type) {
188 switch (type->tag()) {
189 case intTag : return ipop();
190 case longTag : return lpop();
191 case floatTag : return fpop();
192 case doubleTag : return dpop();
193 case objectTag : return apop();
194 case addressTag: return rpop();
195 }
196 ShouldNotReachHere();
197 return NULL;
198 }
199
200 Values* pop_arguments(int argument_size);
201
202 // locks access
203 int lock (Value obj);
204 int unlock();
205 Value lock_at(int i) const { return _locks.at(i); }
206
207 // SSA form IR support
208 void setup_phi_for_stack(BlockBegin* b, int index);
209 void setup_phi_for_local(BlockBegin* b, int index);
210
211 // debugging
212 void print() PRODUCT_RETURN;
213 void verify() PRODUCT_RETURN;
214 };
215
216
217
218 // Macro definitions for simple iteration of stack and local values of a ValueStack
219 // The macros can be used like a for-loop. All variables (state, index and value)
220 // must be defined before the loop.
221 // When states are nested because of inlining, the stack of the innermost state
222 // cumulates also the stack of the nested states. In contrast, the locals of all
223 // states must be iterated each.
224 // Use the following code pattern to iterate all stack values and all nested local values:
225 //
226 // ValueStack* state = ... // state that is iterated
227 // int index; // current loop index (overwritten in loop)
228 // Value value; // value at current loop index (overwritten in loop)
229 //
230 // for_each_stack_value(state, index, value {
231 // do something with value and index
232 // }
233 //
234 // for_each_state(state) {
235 // for_each_local_value(state, index, value) {
236 // do something with value and index
237 // }
238 // }
239 // as an invariant, state is NULL now
240
241
242 // construct a unique variable name with the line number where the macro is used
243 #define temp_var3(x) temp__ ## x
244 #define temp_var2(x) temp_var3(x)
245 #define temp_var temp_var2(__LINE__)
246
247 #define for_each_state(state) \
248 for (; state != NULL; state = state->caller_state())
249
250 #define for_each_local_value(state, index, value) \
251 int temp_var = state->locals_size(); \
252 for (index = 0; \
253 index < temp_var && (value = state->local_at(index), true); \
254 index += (value == NULL || value->type()->is_illegal() ? 1 : value->type()->size())) \
255 if (value != NULL)
256
257
258 #define for_each_stack_value(state, index, value) \
259 int temp_var = state->stack_size(); \
260 for (index = 0; \
261 index < temp_var && (value = state->stack_at(index), true); \
262 index += value->type()->size())
263
264
265 #define for_each_lock_value(state, index, value) \
266 int temp_var = state->locks_size(); \
267 for (index = 0; \
268 index < temp_var && (value = state->lock_at(index), true); \
269 index++) \
270 if (value != NULL)
271
272
273 // Macro definition for simple iteration of all state values of a ValueStack
274 // Because the code cannot be executed in a single loop, the code must be passed
275 // as a macro parameter.
276 // Use the following code pattern to iterate all stack values and all nested local values:
277 //
278 // ValueStack* state = ... // state that is iterated
279 // for_each_state_value(state, value,
280 // do something with value (note that this is a macro parameter)
281 // );
282
283 #define for_each_state_value(v_state, v_value, v_code) \
284 { \
285 int cur_index; \
286 ValueStack* cur_state = v_state; \
287 Value v_value; \
288 for_each_state(cur_state) { \
289 { \
290 for_each_local_value(cur_state, cur_index, v_value) { \
291 v_code; \
292 } \
293 } \
294 { \
295 for_each_stack_value(cur_state, cur_index, v_value) { \
296 v_code; \
297 } \
298 } \
299 } \
300 }
301
302
303 // Macro definition for simple iteration of all phif functions of a block, i.e all
304 // phi functions of the ValueStack where the block matches.
305 // Use the following code pattern to iterate all phi functions of a block:
306 //
307 // BlockBegin* block = ... // block that is iterated
308 // for_each_phi_function(block, phi,
309 // do something with the phi function phi (note that this is a macro parameter)
310 // );
311
312 #define for_each_phi_fun(v_block, v_phi, v_code) \
313 { \
314 int cur_index; \
315 ValueStack* cur_state = v_block->state(); \
316 Value value; \
317 { \
318 for_each_stack_value(cur_state, cur_index, value) { \
319 Phi* v_phi = value->as_Phi(); \
320 if (v_phi != NULL && v_phi->block() == v_block) { \
321 v_code; \
322 } \
323 } \
324 } \
325 { \
326 for_each_local_value(cur_state, cur_index, value) { \
327 Phi* v_phi = value->as_Phi(); \
328 if (v_phi != NULL && v_phi->block() == v_block) { \
329 v_code; \
330 } \
331 } \
332 } \
333 }
334
335 #endif // SHARE_VM_C1_C1_VALUESTACK_HPP