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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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1 /* This file contains the definitions of the GIMPLE IR tuples used in GCC. | |
2 | |
3 Copyright (C) 2007, 2008 Free Software Foundation, Inc. | |
4 Contributed by Aldy Hernandez <aldyh@redhat.com> | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify it under | |
9 the terms of the GNU General Public License as published by the Free | |
10 Software Foundation; either version 3, or (at your option) any later | |
11 version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 /* The format of this file is | |
23 DEFGSCODE(GIMPLE_symbol, printable name, structure). | |
24 | |
25 Where symbol is the enumeration name without the ``GIMPLE_''. | |
26 The argument STRUCTURE is used to compute offsets into each of the | |
27 tuple structures that contain operands. Since vector operands | |
28 are at different offsets depending on the particular structure | |
29 used, these offsets are computed at compile time for efficient | |
30 lookup at runtime. See gimple_ops(). | |
31 | |
32 If a code does not use operand vectors, STRUCTURE should be NULL. */ | |
33 | |
34 /* Error marker. This is used in similar ways as ERROR_MARK in tree.def. */ | |
35 DEFGSCODE(GIMPLE_ERROR_MARK, "gimple_error_mark", NULL) | |
36 | |
37 /* IMPORTANT. Do not rearrange the codes between GIMPLE_COND and | |
38 GIMPLE_RETURN. The ordering is exposed by gimple_has_ops calls. | |
39 These are all the GIMPLE statements with register operands. */ | |
40 | |
41 /* GIMPLE_COND <COND_CODE, OP1, OP2, TRUE_LABEL, FALSE_LABEL> | |
42 represents the conditional jump: | |
43 | |
44 if (OP1 COND_CODE OP2) goto TRUE_LABEL else goto FALSE_LABEL | |
45 | |
46 COND_CODE is the tree code used as the comparison predicate. It | |
47 must be of class tcc_comparison. | |
48 | |
49 OP1 and OP2 are the operands used in the comparison. They must be | |
50 accepted by is_gimple_operand. | |
51 | |
52 TRUE_LABEL and FALSE_LABEL are the LABEL_DECL nodes used as the | |
53 jump target for the comparison. */ | |
54 DEFGSCODE(GIMPLE_COND, "gimple_cond", struct gimple_statement_with_ops) | |
55 | |
56 /* GIMPLE_GOTO <TARGET> represents unconditional jumps. | |
57 TARGET is a LABEL_DECL or an expression node for computed GOTOs. */ | |
58 DEFGSCODE(GIMPLE_GOTO, "gimple_goto", struct gimple_statement_with_ops) | |
59 | |
60 /* GIMPLE_LABEL <LABEL> represents label statements. LABEL is a | |
61 LABEL_DECL representing a jump target. */ | |
62 DEFGSCODE(GIMPLE_LABEL, "gimple_label", struct gimple_statement_with_ops) | |
63 | |
64 /* GIMPLE_SWITCH <INDEX, DEFAULT_LAB, LAB1, ..., LABN> represents the | |
65 multiway branch: | |
66 | |
67 switch (INDEX) | |
68 { | |
69 case LAB1: ...; break; | |
70 ... | |
71 case LABN: ...; break; | |
72 default: ... | |
73 } | |
74 | |
75 INDEX is the variable evaluated to decide which label to jump to. | |
76 | |
77 DEFAULT_LAB, LAB1 ... LABN are the tree nodes representing case labels. | |
78 They must be CASE_LABEL_EXPR nodes. */ | |
79 DEFGSCODE(GIMPLE_SWITCH, "gimple_switch", struct gimple_statement_with_ops) | |
80 | |
81 /* GIMPLE_CHANGE_DYNAMIC_TYPE indicates a change in the dynamic type | |
82 of a memory location. This has no value and generates no | |
83 executable code. It is only used for type based alias analysis. | |
84 This is generated by C++ placement new and it's a direct | |
85 translation from CHANGE_DYNAMIC_TYPE_EXPR. The first operand | |
86 (gimple_cdt_new_type) is the new type. The second operand | |
87 (gimple_cdt_location) is the location (pointer) whose type is being | |
88 changed. */ | |
89 DEFGSCODE(GIMPLE_CHANGE_DYNAMIC_TYPE, "gimple_change_dynamic_type", | |
90 struct gimple_statement_with_ops) | |
91 | |
92 /* IMPORTANT. | |
93 | |
94 Do not rearrange the codes between GIMPLE_ASSIGN and GIMPLE_RETURN. | |
95 It's exposed by GIMPLE_RANGE_CHECK calls. These are all the GIMPLE | |
96 statements with memory and register operands. */ | |
97 | |
98 /* GIMPLE_ASSIGN <SUBCODE, LHS, RHS1[, RHS2]> represents the assignment | |
99 statement | |
100 | |
101 LHS = RHS1 SUBCODE RHS2. | |
102 | |
103 SUBCODE is the tree code for the expression computed by the RHS of the | |
104 assignment. It must be one of the tree codes accepted by | |
105 get_gimple_rhs_class. | |
106 | |
107 LHS is the operand on the LHS of the assignment. It must be a tree node | |
108 accepted by is_gimple_operand. | |
109 | |
110 RHS1 is the first operand on the RHS of the assignment. It must be a tree | |
111 node accepted by is_gimple_operand. | |
112 | |
113 RHS2 is the second operand on the RHS of the assignemnt. It must be a tree | |
114 node accepted by is_gimple_operand. This argument exists only if SUBCODE is | |
115 of class GIMPLE_BINARY_RHS. */ | |
116 DEFGSCODE(GIMPLE_ASSIGN, "gimple_assign", | |
117 struct gimple_statement_with_memory_ops) | |
118 | |
119 /* GIMPLE_ASM <STRING, I1, ..., IN, O1, ... OM, C1, ..., CP> | |
120 represents inline assembly statements. | |
121 | |
122 STRING is the string containing the assembly statements. | |
123 I1 ... IN are the N input operands. | |
124 O1 ... OM are the M output operands. | |
125 C1 ... CP are the P clobber operands. */ | |
126 DEFGSCODE(GIMPLE_ASM, "gimple_asm", struct gimple_statement_asm) | |
127 | |
128 /* GIMPLE_CALL <FN, LHS, ARG1, ..., ARGN[, CHAIN]> represents function | |
129 calls. | |
130 | |
131 FN is the callee. It must be accepted by is_gimple_call_addr. | |
132 | |
133 LHS is the operand where the return value from FN is stored. It may | |
134 be NULL. | |
135 | |
136 ARG1 ... ARGN are the arguments. They must all be accepted by | |
137 is_gimple_operand. | |
138 | |
139 CHAIN is the optional static chain link for nested functions. */ | |
140 DEFGSCODE(GIMPLE_CALL, "gimple_call", | |
141 struct gimple_statement_with_memory_ops) | |
142 | |
143 /* GIMPLE_RETURN <RETVAL> represents return statements. | |
144 | |
145 RETVAL is the value to return or NULL. If a value is returned it | |
146 must be accepted by is_gimple_operand. */ | |
147 DEFGSCODE(GIMPLE_RETURN, "gimple_return", | |
148 struct gimple_statement_with_memory_ops) | |
149 | |
150 /* GIMPLE_BIND <VARS, BLOCK, BODY> represents a lexical scope. | |
151 VARS is the set of variables declared in that scope. | |
152 BLOCK is the symbol binding block used for debug information. | |
153 BODY is the sequence of statements in the scope. */ | |
154 DEFGSCODE(GIMPLE_BIND, "gimple_bind", NULL) | |
155 | |
156 /* GIMPLE_CATCH <TYPES, HANDLER> represents a typed exception handler. | |
157 TYPES is the type (or list of types) handled. HANDLER is the | |
158 sequence of statements that handle these types. */ | |
159 DEFGSCODE(GIMPLE_CATCH, "gimple_catch", NULL) | |
160 | |
161 /* GIMPLE_EH_FILTER <TYPES, FAILURE> represents an exception | |
162 specification. TYPES is a list of allowed types and FAILURE is the | |
163 sequence of statements to execute on failure. */ | |
164 DEFGSCODE(GIMPLE_EH_FILTER, "gimple_eh_filter", NULL) | |
165 | |
166 /* GIMPLE_PHI <RESULT, ARG1, ..., ARGN> represents the PHI node | |
167 | |
168 RESULT = PHI <ARG1, ..., ARGN> | |
169 | |
170 RESULT is the SSA name created by this PHI node. | |
171 | |
172 ARG1 ... ARGN are the arguments to the PHI node. N must be | |
173 exactly the same as the number of incoming edges to the basic block | |
174 holding the PHI node. Every argument is either an SSA name or a | |
175 tree node of class tcc_constant. */ | |
176 DEFGSCODE(GIMPLE_PHI, "gimple_phi", NULL) | |
177 | |
178 /* GIMPLE_RESX <REGION> resumes execution after an exception. | |
179 REGION is the region number being left. */ | |
180 DEFGSCODE(GIMPLE_RESX, "gimple_resx", NULL) | |
181 | |
182 /* GIMPLE_TRY <TRY_KIND, EVAL, CLEANUP> | |
183 represents a try/catch or a try/finally statement. | |
184 | |
185 TRY_KIND is either GIMPLE_TRY_CATCH or GIMPLE_TRY_FINALLY. | |
186 | |
187 EVAL is the sequence of statements to execute on entry to GIMPLE_TRY. | |
188 | |
189 CLEANUP is the sequence of statements to execute according to | |
190 TRY_KIND. If TRY_KIND is GIMPLE_TRY_CATCH, CLEANUP is only exected | |
191 if an exception is thrown during execution of EVAL. If TRY_KIND is | |
192 GIMPLE_TRY_FINALLY, CLEANUP is always executed after executing EVAL | |
193 (regardless of whether EVAL finished normally, or jumped out or an | |
194 exception was thrown). */ | |
195 DEFGSCODE(GIMPLE_TRY, "gimple_try", NULL) | |
196 | |
197 /* GIMPLE_NOP represents the "do nothing" statement. */ | |
198 DEFGSCODE(GIMPLE_NOP, "gimple_nop", NULL) | |
199 | |
200 | |
201 /* IMPORTANT. | |
202 | |
203 Do not rearrange any of the GIMPLE_OMP_* codes. This ordering is | |
204 exposed by the range check in gimple_omp_subcode(). */ | |
205 | |
206 | |
207 /* Tuples used for lowering of OMP_ATOMIC. Although the form of the OMP_ATOMIC | |
208 expression is very simple (just in form mem op= expr), various implicit | |
209 conversions may cause the expression to become more complex, so that it does | |
210 not fit the gimple grammar very well. To overcome this problem, OMP_ATOMIC | |
211 is rewritten as a sequence of two codes in gimplification: | |
212 | |
213 GIMPLE_OMP_LOAD (tmp, mem) | |
214 val = some computations involving tmp; | |
215 GIMPLE_OMP_STORE (val). */ | |
216 DEFGSCODE(GIMPLE_OMP_ATOMIC_LOAD, "gimple_omp_atomic_load", NULL) | |
217 DEFGSCODE(GIMPLE_OMP_ATOMIC_STORE, "gimple_omp_atomic_store", NULL) | |
218 | |
219 /* GIMPLE_OMP_CONTINUE marks the location of the loop or sections | |
220 iteration in partially lowered OpenMP code. */ | |
221 DEFGSCODE(GIMPLE_OMP_CONTINUE, "gimple_omp_continue", NULL) | |
222 | |
223 /* GIMPLE_OMP_CRITICAL <NAME, BODY> represents | |
224 | |
225 #pragma omp critical [name] | |
226 | |
227 NAME is the name given to the critical section. | |
228 BODY is the sequence of statements that are inside the critical section. */ | |
229 DEFGSCODE(GIMPLE_OMP_CRITICAL, "gimple_omp_critical", NULL) | |
230 | |
231 /* GIMPLE_OMP_FOR <BODY, CLAUSES, INDEX, INITIAL, FINAL, COND, INCR, PRE_BODY> | |
232 represents | |
233 | |
234 PRE_BODY | |
235 #pragma omp for [clause1 ... clauseN] | |
236 for (INDEX = INITIAL; INDEX COND FINAL; INDEX {+=,-=} INCR) | |
237 BODY | |
238 | |
239 BODY is the loop body. | |
240 | |
241 CLAUSES is the list of clauses. | |
242 | |
243 INDEX must be an integer or pointer variable, which is implicitly thread | |
244 private. It must be accepted by is_gimple_operand. | |
245 | |
246 INITIAL is the initial value given to INDEX. It must be | |
247 accepted by is_gimple_operand. | |
248 | |
249 FINAL is the final value that INDEX should take. It must | |
250 be accepted by is_gimple_operand. | |
251 | |
252 COND is the condition code for the controlling predicate. It must | |
253 be one of { <, >, <=, >= } | |
254 | |
255 INCR is the loop index increment. It must be tree node of type | |
256 tcc_constant. | |
257 | |
258 PRE_BODY is a landing pad filled by the gimplifier with things from | |
259 INIT, COND, and INCR that are technically part of the OMP_FOR | |
260 structured block, but are evaluated before the loop body begins. | |
261 | |
262 INITIAL, FINAL and INCR are required to be loop invariant integer | |
263 expressions that are evaluated without any synchronization. | |
264 The evaluation order, frequency of evaluation and side-effects are | |
265 unspecified by the standard. */ | |
266 DEFGSCODE(GIMPLE_OMP_FOR, "gimple_omp_for", NULL) | |
267 | |
268 /* GIMPLE_OMP_MASTER <BODY> represents #pragma omp master. | |
269 BODY is the sequence of statements to execute in the master section. */ | |
270 DEFGSCODE(GIMPLE_OMP_MASTER, "gimple_omp_master", NULL) | |
271 | |
272 /* GIMPLE_OMP_ORDERED <BODY> represents #pragma omp ordered. | |
273 BODY is the sequence of statements to execute in the ordered section. */ | |
274 DEFGSCODE(GIMPLE_OMP_ORDERED, "gimple_omp_ordered", NULL) | |
275 | |
276 /* GIMPLE_OMP_PARALLEL <BODY, CLAUSES, CHILD_FN, DATA_ARG> represents | |
277 | |
278 #pragma omp parallel [CLAUSES] | |
279 BODY | |
280 | |
281 BODY is a the sequence of statements to be executed by all threads. | |
282 | |
283 CLAUSES is a TREE_LIST node with all the clauses. | |
284 | |
285 CHILD_FN is set when outlining the body of the parallel region. | |
286 All the statements in BODY are moved into this newly created | |
287 function when converting OMP constructs into low-GIMPLE. | |
288 | |
289 DATA_ARG is a local variable in the parent function containing data | |
290 to be shared with CHILD_FN. This is used to implement all the data | |
291 sharing clauses. */ | |
292 DEFGSCODE(GIMPLE_OMP_PARALLEL, "gimple_omp_parallel", NULL) | |
293 | |
294 /* GIMPLE_OMP_TASK <BODY, CLAUSES, CHILD_FN, DATA_ARG, COPY_FN, | |
295 ARG_SIZE, ARG_ALIGN> represents | |
296 | |
297 #pragma omp task [CLAUSES] | |
298 BODY | |
299 | |
300 BODY is a the sequence of statements to be executed by all threads. | |
301 | |
302 CLAUSES is a TREE_LIST node with all the clauses. | |
303 | |
304 CHILD_FN is set when outlining the body of the explicit task region. | |
305 All the statements in BODY are moved into this newly created | |
306 function when converting OMP constructs into low-GIMPLE. | |
307 | |
308 DATA_ARG is a local variable in the parent function containing data | |
309 to be shared with CHILD_FN. This is used to implement all the data | |
310 sharing clauses. | |
311 | |
312 COPY_FN is set when outlining the firstprivate var initialization. | |
313 All the needed statements are emitted into the newly created | |
314 function, or when only memcpy is needed, it is NULL. | |
315 | |
316 ARG_SIZE and ARG_ALIGN are the size and alignment of the incoming | |
317 data area allocated by GOMP_task and passed to CHILD_FN. */ | |
318 DEFGSCODE(GIMPLE_OMP_TASK, "gimple_omp_task", NULL) | |
319 | |
320 /* OMP_RETURN marks the end of an OpenMP directive. */ | |
321 DEFGSCODE(GIMPLE_OMP_RETURN, "gimple_omp_return", NULL) | |
322 | |
323 /* OMP_SECTION <BODY> represents #pragma omp section. | |
324 BODY is the sequence of statements in the section body. */ | |
325 DEFGSCODE(GIMPLE_OMP_SECTION, "gimple_omp_section", NULL) | |
326 | |
327 /* OMP_SECTIONS <BODY, CLAUSES, CONTROL> represents #pragma omp sections. | |
328 | |
329 BODY is the sequence of statements in the sections body. | |
330 CLAUSES is a TREE_LIST node holding the list of associated clauses. | |
331 CONTROL is a VAR_DECL used for deciding which of the sections | |
332 to execute. */ | |
333 DEFGSCODE(GIMPLE_OMP_SECTIONS, "gimple_omp_sections", NULL) | |
334 | |
335 /* GIMPLE_OMP_SECTIONS_SWITCH is a marker placed immediately after | |
336 OMP_SECTIONS. It represents the GIMPLE_SWITCH used to decide which | |
337 branch is taken. */ | |
338 DEFGSCODE(GIMPLE_OMP_SECTIONS_SWITCH, "gimple_omp_sections_switch", NULL) | |
339 | |
340 /* GIMPLE_OMP_SINGLE <BODY, CLAUSES> represents #pragma omp single | |
341 BODY is the sequence of statements inside the single section. | |
342 CLAUSES is a TREE_LIST node holding the associated clauses. */ | |
343 DEFGSCODE(GIMPLE_OMP_SINGLE, "gimple_omp_single", NULL) | |
344 | |
345 /* GIMPLE_PREDICT <PREDICT, OUTCOME> specifies a hint for branch prediction. | |
346 | |
347 PREDICT is one of the predictors from predict.def. | |
348 | |
349 OUTCOME is NOT_TAKEN or TAKEN. */ | |
350 DEFGSCODE(GIMPLE_PREDICT, "gimple_predict", NULL) | |
351 | |
352 /* This node represents a cleanup expression. It is ONLY USED INTERNALLY | |
353 by the gimplifier as a placeholder for cleanups, and its uses will be | |
354 cleaned up by the time gimplification is done. | |
355 | |
356 This tuple should not exist outside of the gimplifier proper. */ | |
357 DEFGSCODE(GIMPLE_WITH_CLEANUP_EXPR, "gimple_with_cleanup_expr", NULL) |