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a1ab4c31 AC |
1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * U T I L S 2 * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
b7babd5d | 9 | * Copyright (C) 1992-2009, Free Software Foundation, Inc. * |
a1ab4c31 AC |
10 | * * |
11 | * GNAT is free software; you can redistribute it and/or modify it under * | |
12 | * terms of the GNU General Public License as published by the Free Soft- * | |
13 | * ware Foundation; either version 3, or (at your option) any later ver- * | |
14 | * sion. GNAT is distributed in the hope that it will be useful, but WITH- * | |
15 | * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * | |
16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * | |
17 | * for more details. You should have received a copy of the GNU General * | |
18 | * Public License along with GCC; see the file COPYING3. If not see * | |
19 | * <http://www.gnu.org/licenses/>. * | |
20 | * * | |
21 | * GNAT was originally developed by the GNAT team at New York University. * | |
22 | * Extensive contributions were provided by Ada Core Technologies Inc. * | |
23 | * * | |
24 | ****************************************************************************/ | |
25 | ||
26 | #include "config.h" | |
27 | #include "system.h" | |
28 | #include "coretypes.h" | |
29 | #include "tm.h" | |
30 | #include "tree.h" | |
a1ab4c31 AC |
31 | #include "ggc.h" |
32 | #include "flags.h" | |
33 | #include "output.h" | |
34 | #include "ada.h" | |
35 | #include "types.h" | |
36 | #include "atree.h" | |
8713b7e4 | 37 | #include "elists.h" |
a1ab4c31 | 38 | #include "namet.h" |
8713b7e4 EB |
39 | #include "nlists.h" |
40 | #include "snames.h" | |
41 | #include "stringt.h" | |
a1ab4c31 AC |
42 | #include "uintp.h" |
43 | #include "fe.h" | |
a1ab4c31 AC |
44 | #include "sinfo.h" |
45 | #include "einfo.h" | |
46 | #include "ada-tree.h" | |
47 | #include "gigi.h" | |
31fcb30f | 48 | |
a1ab4c31 AC |
49 | static tree find_common_type (tree, tree); |
50 | static bool contains_save_expr_p (tree); | |
51 | static tree contains_null_expr (tree); | |
52 | static tree compare_arrays (tree, tree, tree); | |
53 | static tree nonbinary_modular_operation (enum tree_code, tree, tree, tree); | |
54 | static tree build_simple_component_ref (tree, tree, tree, bool); | |
55 | \f | |
56 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical | |
57 | operation. | |
58 | ||
59 | This preparation consists of taking the ordinary representation of | |
60 | an expression expr and producing a valid tree boolean expression | |
61 | describing whether expr is nonzero. We could simply always do | |
62 | ||
63 | build_binary_op (NE_EXPR, expr, integer_zero_node, 1), | |
64 | ||
65 | but we optimize comparisons, &&, ||, and !. | |
66 | ||
67 | The resulting type should always be the same as the input type. | |
68 | This function is simpler than the corresponding C version since | |
69 | the only possible operands will be things of Boolean type. */ | |
70 | ||
71 | tree | |
72 | gnat_truthvalue_conversion (tree expr) | |
73 | { | |
74 | tree type = TREE_TYPE (expr); | |
75 | ||
76 | switch (TREE_CODE (expr)) | |
77 | { | |
78 | case EQ_EXPR: case NE_EXPR: case LE_EXPR: case GE_EXPR: | |
79 | case LT_EXPR: case GT_EXPR: | |
80 | case TRUTH_ANDIF_EXPR: | |
81 | case TRUTH_ORIF_EXPR: | |
82 | case TRUTH_AND_EXPR: | |
83 | case TRUTH_OR_EXPR: | |
84 | case TRUTH_XOR_EXPR: | |
85 | case ERROR_MARK: | |
86 | return expr; | |
87 | ||
88 | case INTEGER_CST: | |
89 | return (integer_zerop (expr) | |
90 | ? build_int_cst (type, 0) | |
91 | : build_int_cst (type, 1)); | |
92 | ||
93 | case REAL_CST: | |
94 | return (real_zerop (expr) | |
95 | ? fold_convert (type, integer_zero_node) | |
96 | : fold_convert (type, integer_one_node)); | |
97 | ||
98 | case COND_EXPR: | |
99 | /* Distribute the conversion into the arms of a COND_EXPR. */ | |
100 | { | |
101 | tree arg1 = gnat_truthvalue_conversion (TREE_OPERAND (expr, 1)); | |
102 | tree arg2 = gnat_truthvalue_conversion (TREE_OPERAND (expr, 2)); | |
103 | return fold_build3 (COND_EXPR, type, TREE_OPERAND (expr, 0), | |
104 | arg1, arg2); | |
105 | } | |
106 | ||
107 | default: | |
108 | return build_binary_op (NE_EXPR, type, expr, | |
109 | fold_convert (type, integer_zero_node)); | |
110 | } | |
111 | } | |
112 | \f | |
113 | /* Return the base type of TYPE. */ | |
114 | ||
115 | tree | |
116 | get_base_type (tree type) | |
117 | { | |
118 | if (TREE_CODE (type) == RECORD_TYPE | |
119 | && TYPE_JUSTIFIED_MODULAR_P (type)) | |
120 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
121 | ||
122 | while (TREE_TYPE (type) | |
123 | && (TREE_CODE (type) == INTEGER_TYPE | |
124 | || TREE_CODE (type) == REAL_TYPE)) | |
125 | type = TREE_TYPE (type); | |
126 | ||
127 | return type; | |
128 | } | |
129 | \f | |
130 | /* EXP is a GCC tree representing an address. See if we can find how | |
131 | strictly the object at that address is aligned. Return that alignment | |
132 | in bits. If we don't know anything about the alignment, return 0. */ | |
133 | ||
134 | unsigned int | |
135 | known_alignment (tree exp) | |
136 | { | |
137 | unsigned int this_alignment; | |
138 | unsigned int lhs, rhs; | |
139 | ||
140 | switch (TREE_CODE (exp)) | |
141 | { | |
142 | CASE_CONVERT: | |
143 | case VIEW_CONVERT_EXPR: | |
144 | case NON_LVALUE_EXPR: | |
145 | /* Conversions between pointers and integers don't change the alignment | |
146 | of the underlying object. */ | |
147 | this_alignment = known_alignment (TREE_OPERAND (exp, 0)); | |
148 | break; | |
149 | ||
150 | case COMPOUND_EXPR: | |
151 | /* The value of a COMPOUND_EXPR is that of it's second operand. */ | |
152 | this_alignment = known_alignment (TREE_OPERAND (exp, 1)); | |
153 | break; | |
154 | ||
155 | case PLUS_EXPR: | |
156 | case MINUS_EXPR: | |
157 | /* If two address are added, the alignment of the result is the | |
158 | minimum of the two alignments. */ | |
159 | lhs = known_alignment (TREE_OPERAND (exp, 0)); | |
160 | rhs = known_alignment (TREE_OPERAND (exp, 1)); | |
161 | this_alignment = MIN (lhs, rhs); | |
162 | break; | |
163 | ||
164 | case POINTER_PLUS_EXPR: | |
165 | lhs = known_alignment (TREE_OPERAND (exp, 0)); | |
166 | rhs = known_alignment (TREE_OPERAND (exp, 1)); | |
167 | /* If we don't know the alignment of the offset, we assume that | |
168 | of the base. */ | |
169 | if (rhs == 0) | |
170 | this_alignment = lhs; | |
171 | else | |
172 | this_alignment = MIN (lhs, rhs); | |
173 | break; | |
174 | ||
175 | case COND_EXPR: | |
176 | /* If there is a choice between two values, use the smallest one. */ | |
177 | lhs = known_alignment (TREE_OPERAND (exp, 1)); | |
178 | rhs = known_alignment (TREE_OPERAND (exp, 2)); | |
179 | this_alignment = MIN (lhs, rhs); | |
180 | break; | |
181 | ||
182 | case INTEGER_CST: | |
183 | { | |
184 | unsigned HOST_WIDE_INT c = TREE_INT_CST_LOW (exp); | |
185 | /* The first part of this represents the lowest bit in the constant, | |
186 | but it is originally in bytes, not bits. */ | |
187 | this_alignment = MIN (BITS_PER_UNIT * (c & -c), BIGGEST_ALIGNMENT); | |
188 | } | |
189 | break; | |
190 | ||
191 | case MULT_EXPR: | |
192 | /* If we know the alignment of just one side, use it. Otherwise, | |
193 | use the product of the alignments. */ | |
194 | lhs = known_alignment (TREE_OPERAND (exp, 0)); | |
195 | rhs = known_alignment (TREE_OPERAND (exp, 1)); | |
196 | ||
197 | if (lhs == 0) | |
198 | this_alignment = rhs; | |
199 | else if (rhs == 0) | |
200 | this_alignment = lhs; | |
201 | else | |
202 | this_alignment = MIN (lhs * rhs, BIGGEST_ALIGNMENT); | |
203 | break; | |
204 | ||
205 | case BIT_AND_EXPR: | |
206 | /* A bit-and expression is as aligned as the maximum alignment of the | |
207 | operands. We typically get here for a complex lhs and a constant | |
208 | negative power of two on the rhs to force an explicit alignment, so | |
209 | don't bother looking at the lhs. */ | |
210 | this_alignment = known_alignment (TREE_OPERAND (exp, 1)); | |
211 | break; | |
212 | ||
213 | case ADDR_EXPR: | |
214 | this_alignment = expr_align (TREE_OPERAND (exp, 0)); | |
215 | break; | |
216 | ||
217 | default: | |
218 | /* For other pointer expressions, we assume that the pointed-to object | |
219 | is at least as aligned as the pointed-to type. Beware that we can | |
220 | have a dummy type here (e.g. a Taft Amendment type), for which the | |
221 | alignment is meaningless and should be ignored. */ | |
222 | if (POINTER_TYPE_P (TREE_TYPE (exp)) | |
223 | && !TYPE_IS_DUMMY_P (TREE_TYPE (TREE_TYPE (exp)))) | |
224 | this_alignment = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp))); | |
225 | else | |
226 | this_alignment = 0; | |
227 | break; | |
228 | } | |
229 | ||
230 | return this_alignment; | |
231 | } | |
232 | \f | |
233 | /* We have a comparison or assignment operation on two types, T1 and T2, which | |
234 | are either both array types or both record types. T1 is assumed to be for | |
235 | the left hand side operand, and T2 for the right hand side. Return the | |
236 | type that both operands should be converted to for the operation, if any. | |
237 | Otherwise return zero. */ | |
238 | ||
239 | static tree | |
240 | find_common_type (tree t1, tree t2) | |
241 | { | |
242 | /* ??? As of today, various constructs lead here with types of different | |
243 | sizes even when both constants (e.g. tagged types, packable vs regular | |
244 | component types, padded vs unpadded types, ...). While some of these | |
245 | would better be handled upstream (types should be made consistent before | |
246 | calling into build_binary_op), some others are really expected and we | |
247 | have to be careful. */ | |
248 | ||
249 | /* We must prevent writing more than what the target may hold if this is for | |
250 | an assignment and the case of tagged types is handled in build_binary_op | |
251 | so use the lhs type if it is known to be smaller, or of constant size and | |
252 | the rhs type is not, whatever the modes. We also force t1 in case of | |
253 | constant size equality to minimize occurrences of view conversions on the | |
254 | lhs of assignments. */ | |
255 | if (TREE_CONSTANT (TYPE_SIZE (t1)) | |
256 | && (!TREE_CONSTANT (TYPE_SIZE (t2)) | |
257 | || !tree_int_cst_lt (TYPE_SIZE (t2), TYPE_SIZE (t1)))) | |
258 | return t1; | |
259 | ||
260 | /* Otherwise, if the lhs type is non-BLKmode, use it. Note that we know | |
261 | that we will not have any alignment problems since, if we did, the | |
262 | non-BLKmode type could not have been used. */ | |
263 | if (TYPE_MODE (t1) != BLKmode) | |
264 | return t1; | |
265 | ||
266 | /* If the rhs type is of constant size, use it whatever the modes. At | |
267 | this point it is known to be smaller, or of constant size and the | |
268 | lhs type is not. */ | |
269 | if (TREE_CONSTANT (TYPE_SIZE (t2))) | |
270 | return t2; | |
271 | ||
272 | /* Otherwise, if the rhs type is non-BLKmode, use it. */ | |
273 | if (TYPE_MODE (t2) != BLKmode) | |
274 | return t2; | |
275 | ||
276 | /* In this case, both types have variable size and BLKmode. It's | |
277 | probably best to leave the "type mismatch" because changing it | |
278 | could cause a bad self-referential reference. */ | |
279 | return NULL_TREE; | |
280 | } | |
281 | \f | |
282 | /* See if EXP contains a SAVE_EXPR in a position where we would | |
283 | normally put it. | |
284 | ||
285 | ??? This is a real kludge, but is probably the best approach short | |
286 | of some very general solution. */ | |
287 | ||
288 | static bool | |
289 | contains_save_expr_p (tree exp) | |
290 | { | |
291 | switch (TREE_CODE (exp)) | |
292 | { | |
293 | case SAVE_EXPR: | |
294 | return true; | |
295 | ||
296 | case ADDR_EXPR: case INDIRECT_REF: | |
297 | case COMPONENT_REF: | |
298 | CASE_CONVERT: case VIEW_CONVERT_EXPR: | |
299 | return contains_save_expr_p (TREE_OPERAND (exp, 0)); | |
300 | ||
301 | case CONSTRUCTOR: | |
302 | { | |
303 | tree value; | |
304 | unsigned HOST_WIDE_INT ix; | |
305 | ||
306 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), ix, value) | |
307 | if (contains_save_expr_p (value)) | |
308 | return true; | |
309 | return false; | |
310 | } | |
311 | ||
312 | default: | |
313 | return false; | |
314 | } | |
315 | } | |
316 | \f | |
317 | /* See if EXP contains a NULL_EXPR in an expression we use for sizes. Return | |
318 | it if so. This is used to detect types whose sizes involve computations | |
319 | that are known to raise Constraint_Error. */ | |
320 | ||
321 | static tree | |
322 | contains_null_expr (tree exp) | |
323 | { | |
324 | tree tem; | |
325 | ||
326 | if (TREE_CODE (exp) == NULL_EXPR) | |
327 | return exp; | |
328 | ||
329 | switch (TREE_CODE_CLASS (TREE_CODE (exp))) | |
330 | { | |
331 | case tcc_unary: | |
332 | return contains_null_expr (TREE_OPERAND (exp, 0)); | |
333 | ||
334 | case tcc_comparison: | |
335 | case tcc_binary: | |
336 | tem = contains_null_expr (TREE_OPERAND (exp, 0)); | |
337 | if (tem) | |
338 | return tem; | |
339 | ||
340 | return contains_null_expr (TREE_OPERAND (exp, 1)); | |
341 | ||
342 | case tcc_expression: | |
343 | switch (TREE_CODE (exp)) | |
344 | { | |
345 | case SAVE_EXPR: | |
346 | return contains_null_expr (TREE_OPERAND (exp, 0)); | |
347 | ||
348 | case COND_EXPR: | |
349 | tem = contains_null_expr (TREE_OPERAND (exp, 0)); | |
350 | if (tem) | |
351 | return tem; | |
352 | ||
353 | tem = contains_null_expr (TREE_OPERAND (exp, 1)); | |
354 | if (tem) | |
355 | return tem; | |
356 | ||
357 | return contains_null_expr (TREE_OPERAND (exp, 2)); | |
358 | ||
359 | default: | |
360 | return 0; | |
361 | } | |
362 | ||
363 | default: | |
364 | return 0; | |
365 | } | |
366 | } | |
367 | \f | |
368 | /* Return an expression tree representing an equality comparison of | |
369 | A1 and A2, two objects of ARRAY_TYPE. The returned expression should | |
370 | be of type RESULT_TYPE | |
371 | ||
372 | Two arrays are equal in one of two ways: (1) if both have zero length | |
373 | in some dimension (not necessarily the same dimension) or (2) if the | |
374 | lengths in each dimension are equal and the data is equal. We perform the | |
375 | length tests in as efficient a manner as possible. */ | |
376 | ||
377 | static tree | |
378 | compare_arrays (tree result_type, tree a1, tree a2) | |
379 | { | |
380 | tree t1 = TREE_TYPE (a1); | |
381 | tree t2 = TREE_TYPE (a2); | |
382 | tree result = convert (result_type, integer_one_node); | |
383 | tree a1_is_null = convert (result_type, integer_zero_node); | |
384 | tree a2_is_null = convert (result_type, integer_zero_node); | |
385 | bool length_zero_p = false; | |
386 | ||
387 | /* Process each dimension separately and compare the lengths. If any | |
388 | dimension has a size known to be zero, set SIZE_ZERO_P to 1 to | |
389 | suppress the comparison of the data. */ | |
390 | while (TREE_CODE (t1) == ARRAY_TYPE && TREE_CODE (t2) == ARRAY_TYPE) | |
391 | { | |
392 | tree lb1 = TYPE_MIN_VALUE (TYPE_DOMAIN (t1)); | |
393 | tree ub1 = TYPE_MAX_VALUE (TYPE_DOMAIN (t1)); | |
394 | tree lb2 = TYPE_MIN_VALUE (TYPE_DOMAIN (t2)); | |
395 | tree ub2 = TYPE_MAX_VALUE (TYPE_DOMAIN (t2)); | |
396 | tree bt = get_base_type (TREE_TYPE (lb1)); | |
397 | tree length1 = fold_build2 (MINUS_EXPR, bt, ub1, lb1); | |
398 | tree length2 = fold_build2 (MINUS_EXPR, bt, ub2, lb2); | |
399 | tree nbt; | |
400 | tree tem; | |
401 | tree comparison, this_a1_is_null, this_a2_is_null; | |
402 | ||
403 | /* If the length of the first array is a constant, swap our operands | |
404 | unless the length of the second array is the constant zero. | |
405 | Note that we have set the `length' values to the length - 1. */ | |
406 | if (TREE_CODE (length1) == INTEGER_CST | |
407 | && !integer_zerop (fold_build2 (PLUS_EXPR, bt, length2, | |
408 | convert (bt, integer_one_node)))) | |
409 | { | |
410 | tem = a1, a1 = a2, a2 = tem; | |
411 | tem = t1, t1 = t2, t2 = tem; | |
412 | tem = lb1, lb1 = lb2, lb2 = tem; | |
413 | tem = ub1, ub1 = ub2, ub2 = tem; | |
414 | tem = length1, length1 = length2, length2 = tem; | |
415 | tem = a1_is_null, a1_is_null = a2_is_null, a2_is_null = tem; | |
416 | } | |
417 | ||
418 | /* If the length of this dimension in the second array is the constant | |
419 | zero, we can just go inside the original bounds for the first | |
420 | array and see if last < first. */ | |
421 | if (integer_zerop (fold_build2 (PLUS_EXPR, bt, length2, | |
422 | convert (bt, integer_one_node)))) | |
423 | { | |
424 | tree ub = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1))); | |
425 | tree lb = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1))); | |
426 | ||
427 | comparison = build_binary_op (LT_EXPR, result_type, ub, lb); | |
428 | comparison = SUBSTITUTE_PLACEHOLDER_IN_EXPR (comparison, a1); | |
429 | length1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length1, a1); | |
430 | ||
431 | length_zero_p = true; | |
432 | this_a1_is_null = comparison; | |
433 | this_a2_is_null = convert (result_type, integer_one_node); | |
434 | } | |
435 | ||
436 | /* If the length is some other constant value, we know that the | |
437 | this dimension in the first array cannot be superflat, so we | |
438 | can just use its length from the actual stored bounds. */ | |
439 | else if (TREE_CODE (length2) == INTEGER_CST) | |
440 | { | |
441 | ub1 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1))); | |
442 | lb1 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1))); | |
443 | ub2 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t2))); | |
444 | lb2 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t2))); | |
445 | nbt = get_base_type (TREE_TYPE (ub1)); | |
446 | ||
447 | comparison | |
448 | = build_binary_op (EQ_EXPR, result_type, | |
449 | build_binary_op (MINUS_EXPR, nbt, ub1, lb1), | |
450 | build_binary_op (MINUS_EXPR, nbt, ub2, lb2)); | |
451 | ||
452 | /* Note that we know that UB2 and LB2 are constant and hence | |
453 | cannot contain a PLACEHOLDER_EXPR. */ | |
454 | ||
455 | comparison = SUBSTITUTE_PLACEHOLDER_IN_EXPR (comparison, a1); | |
456 | length1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length1, a1); | |
457 | ||
458 | this_a1_is_null = build_binary_op (LT_EXPR, result_type, ub1, lb1); | |
459 | this_a2_is_null = convert (result_type, integer_zero_node); | |
460 | } | |
461 | ||
462 | /* Otherwise compare the computed lengths. */ | |
463 | else | |
464 | { | |
465 | length1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length1, a1); | |
466 | length2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length2, a2); | |
467 | ||
468 | comparison | |
469 | = build_binary_op (EQ_EXPR, result_type, length1, length2); | |
470 | ||
471 | this_a1_is_null | |
472 | = build_binary_op (LT_EXPR, result_type, length1, | |
473 | convert (bt, integer_zero_node)); | |
474 | this_a2_is_null | |
475 | = build_binary_op (LT_EXPR, result_type, length2, | |
476 | convert (bt, integer_zero_node)); | |
477 | } | |
478 | ||
479 | result = build_binary_op (TRUTH_ANDIF_EXPR, result_type, | |
480 | result, comparison); | |
481 | ||
482 | a1_is_null = build_binary_op (TRUTH_ORIF_EXPR, result_type, | |
483 | this_a1_is_null, a1_is_null); | |
484 | a2_is_null = build_binary_op (TRUTH_ORIF_EXPR, result_type, | |
485 | this_a2_is_null, a2_is_null); | |
486 | ||
487 | t1 = TREE_TYPE (t1); | |
488 | t2 = TREE_TYPE (t2); | |
489 | } | |
490 | ||
491 | /* Unless the size of some bound is known to be zero, compare the | |
492 | data in the array. */ | |
493 | if (!length_zero_p) | |
494 | { | |
495 | tree type = find_common_type (TREE_TYPE (a1), TREE_TYPE (a2)); | |
496 | ||
497 | if (type) | |
498 | a1 = convert (type, a1), a2 = convert (type, a2); | |
499 | ||
500 | result = build_binary_op (TRUTH_ANDIF_EXPR, result_type, result, | |
501 | fold_build2 (EQ_EXPR, result_type, a1, a2)); | |
502 | ||
503 | } | |
504 | ||
505 | /* The result is also true if both sizes are zero. */ | |
506 | result = build_binary_op (TRUTH_ORIF_EXPR, result_type, | |
507 | build_binary_op (TRUTH_ANDIF_EXPR, result_type, | |
508 | a1_is_null, a2_is_null), | |
509 | result); | |
510 | ||
511 | /* If either operand contains SAVE_EXPRs, they have to be evaluated before | |
512 | starting the comparison above since the place it would be otherwise | |
513 | evaluated would be wrong. */ | |
514 | ||
515 | if (contains_save_expr_p (a1)) | |
516 | result = build2 (COMPOUND_EXPR, result_type, a1, result); | |
517 | ||
518 | if (contains_save_expr_p (a2)) | |
519 | result = build2 (COMPOUND_EXPR, result_type, a2, result); | |
520 | ||
521 | return result; | |
522 | } | |
523 | \f | |
524 | /* Compute the result of applying OP_CODE to LHS and RHS, where both are of | |
525 | type TYPE. We know that TYPE is a modular type with a nonbinary | |
526 | modulus. */ | |
527 | ||
528 | static tree | |
529 | nonbinary_modular_operation (enum tree_code op_code, tree type, tree lhs, | |
530 | tree rhs) | |
531 | { | |
532 | tree modulus = TYPE_MODULUS (type); | |
533 | unsigned int needed_precision = tree_floor_log2 (modulus) + 1; | |
534 | unsigned int precision; | |
535 | bool unsignedp = true; | |
536 | tree op_type = type; | |
537 | tree result; | |
538 | ||
539 | /* If this is an addition of a constant, convert it to a subtraction | |
540 | of a constant since we can do that faster. */ | |
541 | if (op_code == PLUS_EXPR && TREE_CODE (rhs) == INTEGER_CST) | |
542 | { | |
543 | rhs = fold_build2 (MINUS_EXPR, type, modulus, rhs); | |
544 | op_code = MINUS_EXPR; | |
545 | } | |
546 | ||
547 | /* For the logical operations, we only need PRECISION bits. For | |
548 | addition and subtraction, we need one more and for multiplication we | |
549 | need twice as many. But we never want to make a size smaller than | |
550 | our size. */ | |
551 | if (op_code == PLUS_EXPR || op_code == MINUS_EXPR) | |
552 | needed_precision += 1; | |
553 | else if (op_code == MULT_EXPR) | |
554 | needed_precision *= 2; | |
555 | ||
556 | precision = MAX (needed_precision, TYPE_PRECISION (op_type)); | |
557 | ||
558 | /* Unsigned will do for everything but subtraction. */ | |
559 | if (op_code == MINUS_EXPR) | |
560 | unsignedp = false; | |
561 | ||
562 | /* If our type is the wrong signedness or isn't wide enough, make a new | |
563 | type and convert both our operands to it. */ | |
564 | if (TYPE_PRECISION (op_type) < precision | |
565 | || TYPE_UNSIGNED (op_type) != unsignedp) | |
566 | { | |
567 | /* Copy the node so we ensure it can be modified to make it modular. */ | |
568 | op_type = copy_node (gnat_type_for_size (precision, unsignedp)); | |
569 | modulus = convert (op_type, modulus); | |
570 | SET_TYPE_MODULUS (op_type, modulus); | |
571 | TYPE_MODULAR_P (op_type) = 1; | |
572 | lhs = convert (op_type, lhs); | |
573 | rhs = convert (op_type, rhs); | |
574 | } | |
575 | ||
576 | /* Do the operation, then we'll fix it up. */ | |
577 | result = fold_build2 (op_code, op_type, lhs, rhs); | |
578 | ||
579 | /* For multiplication, we have no choice but to do a full modulus | |
580 | operation. However, we want to do this in the narrowest | |
581 | possible size. */ | |
582 | if (op_code == MULT_EXPR) | |
583 | { | |
584 | tree div_type = copy_node (gnat_type_for_size (needed_precision, 1)); | |
585 | modulus = convert (div_type, modulus); | |
586 | SET_TYPE_MODULUS (div_type, modulus); | |
587 | TYPE_MODULAR_P (div_type) = 1; | |
588 | result = convert (op_type, | |
589 | fold_build2 (TRUNC_MOD_EXPR, div_type, | |
590 | convert (div_type, result), modulus)); | |
591 | } | |
592 | ||
593 | /* For subtraction, add the modulus back if we are negative. */ | |
594 | else if (op_code == MINUS_EXPR) | |
595 | { | |
596 | result = save_expr (result); | |
597 | result = fold_build3 (COND_EXPR, op_type, | |
598 | fold_build2 (LT_EXPR, integer_type_node, result, | |
599 | convert (op_type, integer_zero_node)), | |
600 | fold_build2 (PLUS_EXPR, op_type, result, modulus), | |
601 | result); | |
602 | } | |
603 | ||
604 | /* For the other operations, subtract the modulus if we are >= it. */ | |
605 | else | |
606 | { | |
607 | result = save_expr (result); | |
608 | result = fold_build3 (COND_EXPR, op_type, | |
609 | fold_build2 (GE_EXPR, integer_type_node, | |
610 | result, modulus), | |
611 | fold_build2 (MINUS_EXPR, op_type, | |
612 | result, modulus), | |
613 | result); | |
614 | } | |
615 | ||
616 | return convert (type, result); | |
617 | } | |
618 | \f | |
619 | /* Make a binary operation of kind OP_CODE. RESULT_TYPE is the type | |
620 | desired for the result. Usually the operation is to be performed | |
621 | in that type. For MODIFY_EXPR and ARRAY_REF, RESULT_TYPE may be 0 | |
622 | in which case the type to be used will be derived from the operands. | |
623 | ||
624 | This function is very much unlike the ones for C and C++ since we | |
625 | have already done any type conversion and matching required. All we | |
626 | have to do here is validate the work done by SEM and handle subtypes. */ | |
627 | ||
628 | tree | |
629 | build_binary_op (enum tree_code op_code, tree result_type, | |
630 | tree left_operand, tree right_operand) | |
631 | { | |
632 | tree left_type = TREE_TYPE (left_operand); | |
633 | tree right_type = TREE_TYPE (right_operand); | |
634 | tree left_base_type = get_base_type (left_type); | |
635 | tree right_base_type = get_base_type (right_type); | |
636 | tree operation_type = result_type; | |
637 | tree best_type = NULL_TREE; | |
638 | tree modulus, result; | |
639 | bool has_side_effects = false; | |
640 | ||
641 | if (operation_type | |
642 | && TREE_CODE (operation_type) == RECORD_TYPE | |
643 | && TYPE_JUSTIFIED_MODULAR_P (operation_type)) | |
644 | operation_type = TREE_TYPE (TYPE_FIELDS (operation_type)); | |
645 | ||
646 | if (operation_type | |
647 | && !AGGREGATE_TYPE_P (operation_type) | |
648 | && TYPE_EXTRA_SUBTYPE_P (operation_type)) | |
649 | operation_type = get_base_type (operation_type); | |
650 | ||
651 | modulus = (operation_type | |
652 | && TREE_CODE (operation_type) == INTEGER_TYPE | |
653 | && TYPE_MODULAR_P (operation_type) | |
654 | ? TYPE_MODULUS (operation_type) : NULL_TREE); | |
655 | ||
656 | switch (op_code) | |
657 | { | |
658 | case MODIFY_EXPR: | |
659 | /* If there were integral or pointer conversions on the LHS, remove | |
660 | them; we'll be putting them back below if needed. Likewise for | |
661 | conversions between array and record types, except for justified | |
662 | modular types. But don't do this if the right operand is not | |
663 | BLKmode (for packed arrays) unless we are not changing the mode. */ | |
664 | while ((CONVERT_EXPR_P (left_operand) | |
665 | || TREE_CODE (left_operand) == VIEW_CONVERT_EXPR) | |
666 | && (((INTEGRAL_TYPE_P (left_type) | |
667 | || POINTER_TYPE_P (left_type)) | |
668 | && (INTEGRAL_TYPE_P (TREE_TYPE | |
669 | (TREE_OPERAND (left_operand, 0))) | |
670 | || POINTER_TYPE_P (TREE_TYPE | |
671 | (TREE_OPERAND (left_operand, 0))))) | |
672 | || (((TREE_CODE (left_type) == RECORD_TYPE | |
673 | && !TYPE_JUSTIFIED_MODULAR_P (left_type)) | |
674 | || TREE_CODE (left_type) == ARRAY_TYPE) | |
675 | && ((TREE_CODE (TREE_TYPE | |
676 | (TREE_OPERAND (left_operand, 0))) | |
677 | == RECORD_TYPE) | |
678 | || (TREE_CODE (TREE_TYPE | |
679 | (TREE_OPERAND (left_operand, 0))) | |
680 | == ARRAY_TYPE)) | |
681 | && (TYPE_MODE (right_type) == BLKmode | |
682 | || (TYPE_MODE (left_type) | |
683 | == TYPE_MODE (TREE_TYPE | |
684 | (TREE_OPERAND | |
685 | (left_operand, 0)))))))) | |
686 | { | |
687 | left_operand = TREE_OPERAND (left_operand, 0); | |
688 | left_type = TREE_TYPE (left_operand); | |
689 | } | |
690 | ||
691 | /* If a class-wide type may be involved, force use of the RHS type. */ | |
692 | if ((TREE_CODE (right_type) == RECORD_TYPE | |
693 | || TREE_CODE (right_type) == UNION_TYPE) | |
694 | && TYPE_ALIGN_OK (right_type)) | |
695 | operation_type = right_type; | |
696 | ||
697 | /* If we are copying between padded objects with compatible types, use | |
698 | the padded view of the objects, this is very likely more efficient. | |
699 | Likewise for a padded that is assigned a constructor, in order to | |
700 | avoid putting a VIEW_CONVERT_EXPR on the LHS. But don't do this if | |
701 | we wouldn't have actually copied anything. */ | |
702 | else if (TREE_CODE (left_type) == RECORD_TYPE | |
703 | && TYPE_IS_PADDING_P (left_type) | |
704 | && TREE_CONSTANT (TYPE_SIZE (left_type)) | |
705 | && ((TREE_CODE (right_operand) == COMPONENT_REF | |
706 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (right_operand, 0))) | |
707 | == RECORD_TYPE | |
708 | && TYPE_IS_PADDING_P | |
709 | (TREE_TYPE (TREE_OPERAND (right_operand, 0))) | |
710 | && gnat_types_compatible_p | |
711 | (left_type, | |
712 | TREE_TYPE (TREE_OPERAND (right_operand, 0)))) | |
713 | || TREE_CODE (right_operand) == CONSTRUCTOR) | |
714 | && !integer_zerop (TYPE_SIZE (right_type))) | |
715 | operation_type = left_type; | |
716 | ||
717 | /* Find the best type to use for copying between aggregate types. */ | |
718 | else if (((TREE_CODE (left_type) == ARRAY_TYPE | |
719 | && TREE_CODE (right_type) == ARRAY_TYPE) | |
720 | || (TREE_CODE (left_type) == RECORD_TYPE | |
721 | && TREE_CODE (right_type) == RECORD_TYPE)) | |
722 | && (best_type = find_common_type (left_type, right_type))) | |
723 | operation_type = best_type; | |
724 | ||
725 | /* Otherwise use the LHS type. */ | |
726 | else if (!operation_type) | |
727 | operation_type = left_type; | |
728 | ||
729 | /* Ensure everything on the LHS is valid. If we have a field reference, | |
730 | strip anything that get_inner_reference can handle. Then remove any | |
731 | conversions between types having the same code and mode. And mark | |
732 | VIEW_CONVERT_EXPRs with TREE_ADDRESSABLE. When done, we must have | |
733 | either an INDIRECT_REF, a NULL_EXPR or a DECL node. */ | |
734 | result = left_operand; | |
735 | while (true) | |
736 | { | |
737 | tree restype = TREE_TYPE (result); | |
738 | ||
739 | if (TREE_CODE (result) == COMPONENT_REF | |
740 | || TREE_CODE (result) == ARRAY_REF | |
741 | || TREE_CODE (result) == ARRAY_RANGE_REF) | |
742 | while (handled_component_p (result)) | |
743 | result = TREE_OPERAND (result, 0); | |
744 | else if (TREE_CODE (result) == REALPART_EXPR | |
745 | || TREE_CODE (result) == IMAGPART_EXPR | |
746 | || (CONVERT_EXPR_P (result) | |
747 | && (((TREE_CODE (restype) | |
748 | == TREE_CODE (TREE_TYPE | |
749 | (TREE_OPERAND (result, 0)))) | |
750 | && (TYPE_MODE (TREE_TYPE | |
751 | (TREE_OPERAND (result, 0))) | |
752 | == TYPE_MODE (restype))) | |
753 | || TYPE_ALIGN_OK (restype)))) | |
754 | result = TREE_OPERAND (result, 0); | |
755 | else if (TREE_CODE (result) == VIEW_CONVERT_EXPR) | |
756 | { | |
757 | TREE_ADDRESSABLE (result) = 1; | |
758 | result = TREE_OPERAND (result, 0); | |
759 | } | |
760 | else | |
761 | break; | |
762 | } | |
763 | ||
764 | gcc_assert (TREE_CODE (result) == INDIRECT_REF | |
765 | || TREE_CODE (result) == NULL_EXPR | |
766 | || DECL_P (result)); | |
767 | ||
768 | /* Convert the right operand to the operation type unless it is | |
769 | either already of the correct type or if the type involves a | |
770 | placeholder, since the RHS may not have the same record type. */ | |
771 | if (operation_type != right_type | |
772 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (operation_type))) | |
773 | { | |
774 | right_operand = convert (operation_type, right_operand); | |
775 | right_type = operation_type; | |
776 | } | |
777 | ||
778 | /* If the left operand is not of the same type as the operation | |
779 | type, wrap it up in a VIEW_CONVERT_EXPR. */ | |
780 | if (left_type != operation_type) | |
781 | left_operand = unchecked_convert (operation_type, left_operand, false); | |
782 | ||
783 | has_side_effects = true; | |
784 | modulus = NULL_TREE; | |
785 | break; | |
786 | ||
787 | case ARRAY_REF: | |
788 | if (!operation_type) | |
789 | operation_type = TREE_TYPE (left_type); | |
790 | ||
791 | /* ... fall through ... */ | |
792 | ||
793 | case ARRAY_RANGE_REF: | |
794 | /* First look through conversion between type variants. Note that | |
795 | this changes neither the operation type nor the type domain. */ | |
796 | if (TREE_CODE (left_operand) == VIEW_CONVERT_EXPR | |
797 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (left_operand, 0))) | |
798 | == TYPE_MAIN_VARIANT (left_type)) | |
799 | { | |
800 | left_operand = TREE_OPERAND (left_operand, 0); | |
801 | left_type = TREE_TYPE (left_operand); | |
802 | } | |
803 | ||
804 | /* Then convert the right operand to its base type. This will | |
805 | prevent unneeded signedness conversions when sizetype is wider than | |
806 | integer. */ | |
807 | right_operand = convert (right_base_type, right_operand); | |
808 | right_operand = convert (TYPE_DOMAIN (left_type), right_operand); | |
809 | ||
810 | if (!TREE_CONSTANT (right_operand) | |
811 | || !TREE_CONSTANT (TYPE_MIN_VALUE (right_type))) | |
812 | gnat_mark_addressable (left_operand); | |
813 | ||
814 | modulus = NULL_TREE; | |
815 | break; | |
816 | ||
817 | case GE_EXPR: | |
818 | case LE_EXPR: | |
819 | case GT_EXPR: | |
820 | case LT_EXPR: | |
821 | gcc_assert (!POINTER_TYPE_P (left_type)); | |
822 | ||
823 | /* ... fall through ... */ | |
824 | ||
825 | case EQ_EXPR: | |
826 | case NE_EXPR: | |
827 | /* If either operand is a NULL_EXPR, just return a new one. */ | |
828 | if (TREE_CODE (left_operand) == NULL_EXPR) | |
829 | return build2 (op_code, result_type, | |
830 | build1 (NULL_EXPR, integer_type_node, | |
831 | TREE_OPERAND (left_operand, 0)), | |
832 | integer_zero_node); | |
833 | ||
834 | else if (TREE_CODE (right_operand) == NULL_EXPR) | |
835 | return build2 (op_code, result_type, | |
836 | build1 (NULL_EXPR, integer_type_node, | |
837 | TREE_OPERAND (right_operand, 0)), | |
838 | integer_zero_node); | |
839 | ||
840 | /* If either object is a justified modular types, get the | |
841 | fields from within. */ | |
842 | if (TREE_CODE (left_type) == RECORD_TYPE | |
843 | && TYPE_JUSTIFIED_MODULAR_P (left_type)) | |
844 | { | |
845 | left_operand = convert (TREE_TYPE (TYPE_FIELDS (left_type)), | |
846 | left_operand); | |
847 | left_type = TREE_TYPE (left_operand); | |
848 | left_base_type = get_base_type (left_type); | |
849 | } | |
850 | ||
851 | if (TREE_CODE (right_type) == RECORD_TYPE | |
852 | && TYPE_JUSTIFIED_MODULAR_P (right_type)) | |
853 | { | |
854 | right_operand = convert (TREE_TYPE (TYPE_FIELDS (right_type)), | |
855 | right_operand); | |
856 | right_type = TREE_TYPE (right_operand); | |
857 | right_base_type = get_base_type (right_type); | |
858 | } | |
859 | ||
860 | /* If both objects are arrays, compare them specially. */ | |
861 | if ((TREE_CODE (left_type) == ARRAY_TYPE | |
862 | || (TREE_CODE (left_type) == INTEGER_TYPE | |
863 | && TYPE_HAS_ACTUAL_BOUNDS_P (left_type))) | |
864 | && (TREE_CODE (right_type) == ARRAY_TYPE | |
865 | || (TREE_CODE (right_type) == INTEGER_TYPE | |
866 | && TYPE_HAS_ACTUAL_BOUNDS_P (right_type)))) | |
867 | { | |
868 | result = compare_arrays (result_type, left_operand, right_operand); | |
869 | ||
870 | if (op_code == NE_EXPR) | |
871 | result = invert_truthvalue (result); | |
872 | else | |
873 | gcc_assert (op_code == EQ_EXPR); | |
874 | ||
875 | return result; | |
876 | } | |
877 | ||
878 | /* Otherwise, the base types must be the same unless the objects are | |
879 | fat pointers or records. If we have records, use the best type and | |
880 | convert both operands to that type. */ | |
881 | if (left_base_type != right_base_type) | |
882 | { | |
883 | if (TYPE_FAT_POINTER_P (left_base_type) | |
884 | && TYPE_FAT_POINTER_P (right_base_type) | |
885 | && TYPE_MAIN_VARIANT (left_base_type) | |
886 | == TYPE_MAIN_VARIANT (right_base_type)) | |
887 | best_type = left_base_type; | |
888 | else if (TREE_CODE (left_base_type) == RECORD_TYPE | |
889 | && TREE_CODE (right_base_type) == RECORD_TYPE) | |
890 | { | |
891 | /* The only way these are permitted to be the same is if both | |
892 | types have the same name. In that case, one of them must | |
893 | not be self-referential. Use that one as the best type. | |
894 | Even better is if one is of fixed size. */ | |
895 | gcc_assert (TYPE_NAME (left_base_type) | |
896 | && (TYPE_NAME (left_base_type) | |
897 | == TYPE_NAME (right_base_type))); | |
898 | ||
899 | if (TREE_CONSTANT (TYPE_SIZE (left_base_type))) | |
900 | best_type = left_base_type; | |
901 | else if (TREE_CONSTANT (TYPE_SIZE (right_base_type))) | |
902 | best_type = right_base_type; | |
903 | else if (!CONTAINS_PLACEHOLDER_P (TYPE_SIZE (left_base_type))) | |
904 | best_type = left_base_type; | |
905 | else if (!CONTAINS_PLACEHOLDER_P (TYPE_SIZE (right_base_type))) | |
906 | best_type = right_base_type; | |
907 | else | |
908 | gcc_unreachable (); | |
909 | } | |
910 | else | |
911 | gcc_unreachable (); | |
912 | ||
913 | left_operand = convert (best_type, left_operand); | |
914 | right_operand = convert (best_type, right_operand); | |
915 | } | |
916 | ||
917 | /* If we are comparing a fat pointer against zero, we need to | |
918 | just compare the data pointer. */ | |
919 | else if (TYPE_FAT_POINTER_P (left_base_type) | |
920 | && TREE_CODE (right_operand) == CONSTRUCTOR | |
921 | && integer_zerop (VEC_index (constructor_elt, | |
922 | CONSTRUCTOR_ELTS (right_operand), | |
923 | 0) | |
924 | ->value)) | |
925 | { | |
926 | right_operand = build_component_ref (left_operand, NULL_TREE, | |
927 | TYPE_FIELDS (left_base_type), | |
928 | false); | |
929 | left_operand = convert (TREE_TYPE (right_operand), | |
930 | integer_zero_node); | |
931 | } | |
932 | else | |
933 | { | |
934 | left_operand = convert (left_base_type, left_operand); | |
935 | right_operand = convert (right_base_type, right_operand); | |
936 | } | |
937 | ||
938 | modulus = NULL_TREE; | |
939 | break; | |
940 | ||
941 | case PREINCREMENT_EXPR: | |
942 | case PREDECREMENT_EXPR: | |
943 | case POSTINCREMENT_EXPR: | |
944 | case POSTDECREMENT_EXPR: | |
82d3b03a EB |
945 | /* These operations are not used anymore. */ |
946 | gcc_unreachable (); | |
a1ab4c31 AC |
947 | |
948 | case LSHIFT_EXPR: | |
949 | case RSHIFT_EXPR: | |
950 | case LROTATE_EXPR: | |
951 | case RROTATE_EXPR: | |
952 | /* The RHS of a shift can be any type. Also, ignore any modulus | |
953 | (we used to abort, but this is needed for unchecked conversion | |
954 | to modular types). Otherwise, processing is the same as normal. */ | |
955 | gcc_assert (operation_type == left_base_type); | |
956 | modulus = NULL_TREE; | |
957 | left_operand = convert (operation_type, left_operand); | |
958 | break; | |
959 | ||
960 | case TRUTH_ANDIF_EXPR: | |
961 | case TRUTH_ORIF_EXPR: | |
962 | case TRUTH_AND_EXPR: | |
963 | case TRUTH_OR_EXPR: | |
964 | case TRUTH_XOR_EXPR: | |
965 | left_operand = gnat_truthvalue_conversion (left_operand); | |
966 | right_operand = gnat_truthvalue_conversion (right_operand); | |
967 | goto common; | |
968 | ||
969 | case BIT_AND_EXPR: | |
970 | case BIT_IOR_EXPR: | |
971 | case BIT_XOR_EXPR: | |
972 | /* For binary modulus, if the inputs are in range, so are the | |
973 | outputs. */ | |
974 | if (modulus && integer_pow2p (modulus)) | |
975 | modulus = NULL_TREE; | |
a1ab4c31 AC |
976 | goto common; |
977 | ||
978 | case COMPLEX_EXPR: | |
979 | gcc_assert (TREE_TYPE (result_type) == left_base_type | |
980 | && TREE_TYPE (result_type) == right_base_type); | |
981 | left_operand = convert (left_base_type, left_operand); | |
982 | right_operand = convert (right_base_type, right_operand); | |
983 | break; | |
984 | ||
985 | case TRUNC_DIV_EXPR: case TRUNC_MOD_EXPR: | |
986 | case CEIL_DIV_EXPR: case CEIL_MOD_EXPR: | |
987 | case FLOOR_DIV_EXPR: case FLOOR_MOD_EXPR: | |
988 | case ROUND_DIV_EXPR: case ROUND_MOD_EXPR: | |
989 | /* These always produce results lower than either operand. */ | |
990 | modulus = NULL_TREE; | |
991 | goto common; | |
992 | ||
993 | case POINTER_PLUS_EXPR: | |
994 | gcc_assert (operation_type == left_base_type | |
995 | && sizetype == right_base_type); | |
996 | left_operand = convert (operation_type, left_operand); | |
997 | right_operand = convert (sizetype, right_operand); | |
998 | break; | |
999 | ||
82d3b03a EB |
1000 | case PLUS_NOMOD_EXPR: |
1001 | case MINUS_NOMOD_EXPR: | |
1002 | if (op_code == PLUS_NOMOD_EXPR) | |
1003 | op_code = PLUS_EXPR; | |
1004 | else | |
1005 | op_code = MINUS_EXPR; | |
1006 | modulus = NULL_TREE; | |
1007 | ||
1008 | /* ... fall through ... */ | |
1009 | ||
d2143736 EB |
1010 | case PLUS_EXPR: |
1011 | case MINUS_EXPR: | |
b7babd5d EB |
1012 | /* Avoid doing arithmetics in ENUMERAL_TYPE or BOOLEAN_TYPE like the |
1013 | other compilers. Contrary to C, Ada doesn't allow arithmetics in | |
1014 | these types but can generate addition/subtraction for Succ/Pred. */ | |
1015 | if (operation_type | |
1016 | && (TREE_CODE (operation_type) == ENUMERAL_TYPE | |
1017 | || TREE_CODE (operation_type) == BOOLEAN_TYPE)) | |
1018 | operation_type = left_base_type = right_base_type | |
1019 | = gnat_type_for_mode (TYPE_MODE (operation_type), | |
1020 | TYPE_UNSIGNED (operation_type)); | |
82d3b03a EB |
1021 | |
1022 | /* ... fall through ... */ | |
d2143736 | 1023 | |
a1ab4c31 AC |
1024 | default: |
1025 | common: | |
1026 | /* The result type should be the same as the base types of the | |
1027 | both operands (and they should be the same). Convert | |
1028 | everything to the result type. */ | |
1029 | ||
1030 | gcc_assert (operation_type == left_base_type | |
1031 | && left_base_type == right_base_type); | |
1032 | left_operand = convert (operation_type, left_operand); | |
1033 | right_operand = convert (operation_type, right_operand); | |
1034 | } | |
1035 | ||
1036 | if (modulus && !integer_pow2p (modulus)) | |
1037 | { | |
1038 | result = nonbinary_modular_operation (op_code, operation_type, | |
1039 | left_operand, right_operand); | |
1040 | modulus = NULL_TREE; | |
1041 | } | |
1042 | /* If either operand is a NULL_EXPR, just return a new one. */ | |
1043 | else if (TREE_CODE (left_operand) == NULL_EXPR) | |
1044 | return build1 (NULL_EXPR, operation_type, TREE_OPERAND (left_operand, 0)); | |
1045 | else if (TREE_CODE (right_operand) == NULL_EXPR) | |
1046 | return build1 (NULL_EXPR, operation_type, TREE_OPERAND (right_operand, 0)); | |
1047 | else if (op_code == ARRAY_REF || op_code == ARRAY_RANGE_REF) | |
1048 | result = fold (build4 (op_code, operation_type, left_operand, | |
1049 | right_operand, NULL_TREE, NULL_TREE)); | |
1050 | else | |
1051 | result | |
1052 | = fold_build2 (op_code, operation_type, left_operand, right_operand); | |
1053 | ||
1054 | TREE_SIDE_EFFECTS (result) |= has_side_effects; | |
1055 | TREE_CONSTANT (result) | |
1056 | |= (TREE_CONSTANT (left_operand) & TREE_CONSTANT (right_operand) | |
1057 | && op_code != ARRAY_REF && op_code != ARRAY_RANGE_REF); | |
1058 | ||
1059 | if ((op_code == ARRAY_REF || op_code == ARRAY_RANGE_REF) | |
1060 | && TYPE_VOLATILE (operation_type)) | |
1061 | TREE_THIS_VOLATILE (result) = 1; | |
1062 | ||
1063 | /* If we are working with modular types, perform the MOD operation | |
1064 | if something above hasn't eliminated the need for it. */ | |
1065 | if (modulus) | |
1066 | result = fold_build2 (FLOOR_MOD_EXPR, operation_type, result, | |
1067 | convert (operation_type, modulus)); | |
1068 | ||
1069 | if (result_type && result_type != operation_type) | |
1070 | result = convert (result_type, result); | |
1071 | ||
1072 | return result; | |
1073 | } | |
1074 | \f | |
1075 | /* Similar, but for unary operations. */ | |
1076 | ||
1077 | tree | |
1078 | build_unary_op (enum tree_code op_code, tree result_type, tree operand) | |
1079 | { | |
1080 | tree type = TREE_TYPE (operand); | |
1081 | tree base_type = get_base_type (type); | |
1082 | tree operation_type = result_type; | |
1083 | tree result; | |
1084 | bool side_effects = false; | |
1085 | ||
1086 | if (operation_type | |
1087 | && TREE_CODE (operation_type) == RECORD_TYPE | |
1088 | && TYPE_JUSTIFIED_MODULAR_P (operation_type)) | |
1089 | operation_type = TREE_TYPE (TYPE_FIELDS (operation_type)); | |
1090 | ||
1091 | if (operation_type | |
1092 | && !AGGREGATE_TYPE_P (operation_type) | |
1093 | && TYPE_EXTRA_SUBTYPE_P (operation_type)) | |
1094 | operation_type = get_base_type (operation_type); | |
1095 | ||
1096 | switch (op_code) | |
1097 | { | |
1098 | case REALPART_EXPR: | |
1099 | case IMAGPART_EXPR: | |
1100 | if (!operation_type) | |
1101 | result_type = operation_type = TREE_TYPE (type); | |
1102 | else | |
1103 | gcc_assert (result_type == TREE_TYPE (type)); | |
1104 | ||
1105 | result = fold_build1 (op_code, operation_type, operand); | |
1106 | break; | |
1107 | ||
1108 | case TRUTH_NOT_EXPR: | |
1109 | gcc_assert (result_type == base_type); | |
1110 | result = invert_truthvalue (gnat_truthvalue_conversion (operand)); | |
1111 | break; | |
1112 | ||
1113 | case ATTR_ADDR_EXPR: | |
1114 | case ADDR_EXPR: | |
1115 | switch (TREE_CODE (operand)) | |
1116 | { | |
1117 | case INDIRECT_REF: | |
1118 | case UNCONSTRAINED_ARRAY_REF: | |
1119 | result = TREE_OPERAND (operand, 0); | |
1120 | ||
1121 | /* Make sure the type here is a pointer, not a reference. | |
1122 | GCC wants pointer types for function addresses. */ | |
1123 | if (!result_type) | |
1124 | result_type = build_pointer_type (type); | |
1125 | ||
1126 | /* If the underlying object can alias everything, propagate the | |
1127 | property since we are effectively retrieving the object. */ | |
1128 | if (POINTER_TYPE_P (TREE_TYPE (result)) | |
1129 | && TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (result))) | |
1130 | { | |
1131 | if (TREE_CODE (result_type) == POINTER_TYPE | |
1132 | && !TYPE_REF_CAN_ALIAS_ALL (result_type)) | |
1133 | result_type | |
1134 | = build_pointer_type_for_mode (TREE_TYPE (result_type), | |
1135 | TYPE_MODE (result_type), | |
1136 | true); | |
1137 | else if (TREE_CODE (result_type) == REFERENCE_TYPE | |
1138 | && !TYPE_REF_CAN_ALIAS_ALL (result_type)) | |
1139 | result_type | |
1140 | = build_reference_type_for_mode (TREE_TYPE (result_type), | |
1141 | TYPE_MODE (result_type), | |
1142 | true); | |
1143 | } | |
1144 | break; | |
1145 | ||
1146 | case NULL_EXPR: | |
1147 | result = operand; | |
1148 | TREE_TYPE (result) = type = build_pointer_type (type); | |
1149 | break; | |
1150 | ||
1151 | case ARRAY_REF: | |
1152 | case ARRAY_RANGE_REF: | |
1153 | case COMPONENT_REF: | |
1154 | case BIT_FIELD_REF: | |
1155 | /* If this is for 'Address, find the address of the prefix and | |
1156 | add the offset to the field. Otherwise, do this the normal | |
1157 | way. */ | |
1158 | if (op_code == ATTR_ADDR_EXPR) | |
1159 | { | |
1160 | HOST_WIDE_INT bitsize; | |
1161 | HOST_WIDE_INT bitpos; | |
1162 | tree offset, inner; | |
1163 | enum machine_mode mode; | |
1164 | int unsignedp, volatilep; | |
1165 | ||
1166 | inner = get_inner_reference (operand, &bitsize, &bitpos, &offset, | |
1167 | &mode, &unsignedp, &volatilep, | |
1168 | false); | |
1169 | ||
1170 | /* If INNER is a padding type whose field has a self-referential | |
1171 | size, convert to that inner type. We know the offset is zero | |
1172 | and we need to have that type visible. */ | |
1173 | if (TREE_CODE (TREE_TYPE (inner)) == RECORD_TYPE | |
1174 | && TYPE_IS_PADDING_P (TREE_TYPE (inner)) | |
1175 | && (CONTAINS_PLACEHOLDER_P | |
1176 | (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS | |
1177 | (TREE_TYPE (inner))))))) | |
1178 | inner = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (inner))), | |
1179 | inner); | |
1180 | ||
1181 | /* Compute the offset as a byte offset from INNER. */ | |
1182 | if (!offset) | |
1183 | offset = size_zero_node; | |
1184 | ||
1185 | if (bitpos % BITS_PER_UNIT != 0) | |
1186 | post_error | |
1187 | ("taking address of object not aligned on storage unit?", | |
1188 | error_gnat_node); | |
1189 | ||
1190 | offset = size_binop (PLUS_EXPR, offset, | |
1191 | size_int (bitpos / BITS_PER_UNIT)); | |
1192 | ||
1193 | /* Take the address of INNER, convert the offset to void *, and | |
1194 | add then. It will later be converted to the desired result | |
1195 | type, if any. */ | |
1196 | inner = build_unary_op (ADDR_EXPR, NULL_TREE, inner); | |
1197 | inner = convert (ptr_void_type_node, inner); | |
1198 | result = build_binary_op (POINTER_PLUS_EXPR, ptr_void_type_node, | |
1199 | inner, offset); | |
1200 | result = convert (build_pointer_type (TREE_TYPE (operand)), | |
1201 | result); | |
1202 | break; | |
1203 | } | |
1204 | goto common; | |
1205 | ||
1206 | case CONSTRUCTOR: | |
1207 | /* If this is just a constructor for a padded record, we can | |
1208 | just take the address of the single field and convert it to | |
1209 | a pointer to our type. */ | |
1210 | if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) | |
1211 | { | |
1212 | result = (VEC_index (constructor_elt, | |
1213 | CONSTRUCTOR_ELTS (operand), | |
1214 | 0) | |
1215 | ->value); | |
1216 | ||
1217 | result = convert (build_pointer_type (TREE_TYPE (operand)), | |
1218 | build_unary_op (ADDR_EXPR, NULL_TREE, result)); | |
1219 | break; | |
1220 | } | |
1221 | ||
1222 | goto common; | |
1223 | ||
1224 | case NOP_EXPR: | |
1225 | if (AGGREGATE_TYPE_P (type) | |
1226 | && AGGREGATE_TYPE_P (TREE_TYPE (TREE_OPERAND (operand, 0)))) | |
1227 | return build_unary_op (ADDR_EXPR, result_type, | |
1228 | TREE_OPERAND (operand, 0)); | |
1229 | ||
1230 | /* ... fallthru ... */ | |
1231 | ||
1232 | case VIEW_CONVERT_EXPR: | |
1233 | /* If this just a variant conversion or if the conversion doesn't | |
1234 | change the mode, get the result type from this type and go down. | |
1235 | This is needed for conversions of CONST_DECLs, to eventually get | |
1236 | to the address of their CORRESPONDING_VARs. */ | |
1237 | if ((TYPE_MAIN_VARIANT (type) | |
1238 | == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (operand, 0)))) | |
1239 | || (TYPE_MODE (type) != BLKmode | |
1240 | && (TYPE_MODE (type) | |
1241 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (operand, 0)))))) | |
1242 | return build_unary_op (ADDR_EXPR, | |
1243 | (result_type ? result_type | |
1244 | : build_pointer_type (type)), | |
1245 | TREE_OPERAND (operand, 0)); | |
1246 | goto common; | |
1247 | ||
1248 | case CONST_DECL: | |
1249 | operand = DECL_CONST_CORRESPONDING_VAR (operand); | |
1250 | ||
1251 | /* ... fall through ... */ | |
1252 | ||
1253 | default: | |
1254 | common: | |
1255 | ||
1256 | /* If we are taking the address of a padded record whose field is | |
1257 | contains a template, take the address of the template. */ | |
1258 | if (TREE_CODE (type) == RECORD_TYPE | |
1259 | && TYPE_IS_PADDING_P (type) | |
1260 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == RECORD_TYPE | |
1261 | && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (TYPE_FIELDS (type)))) | |
1262 | { | |
1263 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
1264 | operand = convert (type, operand); | |
1265 | } | |
1266 | ||
1267 | if (type != error_mark_node) | |
1268 | operation_type = build_pointer_type (type); | |
1269 | ||
1270 | gnat_mark_addressable (operand); | |
1271 | result = fold_build1 (ADDR_EXPR, operation_type, operand); | |
1272 | } | |
1273 | ||
1274 | TREE_CONSTANT (result) = staticp (operand) || TREE_CONSTANT (operand); | |
1275 | break; | |
1276 | ||
1277 | case INDIRECT_REF: | |
1278 | /* If we want to refer to an entire unconstrained array, | |
1279 | make up an expression to do so. This will never survive to | |
1280 | the backend. If TYPE is a thin pointer, first convert the | |
1281 | operand to a fat pointer. */ | |
1282 | if (TYPE_THIN_POINTER_P (type) | |
1283 | && TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))) | |
1284 | { | |
1285 | operand | |
1286 | = convert (TREE_TYPE (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))), | |
1287 | operand); | |
1288 | type = TREE_TYPE (operand); | |
1289 | } | |
1290 | ||
1291 | if (TYPE_FAT_POINTER_P (type)) | |
1292 | { | |
1293 | result = build1 (UNCONSTRAINED_ARRAY_REF, | |
1294 | TYPE_UNCONSTRAINED_ARRAY (type), operand); | |
1295 | TREE_READONLY (result) = TREE_STATIC (result) | |
1296 | = TYPE_READONLY (TYPE_UNCONSTRAINED_ARRAY (type)); | |
1297 | } | |
1298 | else if (TREE_CODE (operand) == ADDR_EXPR) | |
1299 | result = TREE_OPERAND (operand, 0); | |
1300 | ||
1301 | else | |
1302 | { | |
1303 | result = fold_build1 (op_code, TREE_TYPE (type), operand); | |
1304 | TREE_READONLY (result) = TYPE_READONLY (TREE_TYPE (type)); | |
1305 | } | |
1306 | ||
1307 | side_effects | |
1308 | = (!TYPE_FAT_POINTER_P (type) && TYPE_VOLATILE (TREE_TYPE (type))); | |
1309 | break; | |
1310 | ||
1311 | case NEGATE_EXPR: | |
1312 | case BIT_NOT_EXPR: | |
1313 | { | |
1314 | tree modulus = ((operation_type | |
1315 | && TREE_CODE (operation_type) == INTEGER_TYPE | |
1316 | && TYPE_MODULAR_P (operation_type)) | |
1317 | ? TYPE_MODULUS (operation_type) : NULL_TREE); | |
1318 | int mod_pow2 = modulus && integer_pow2p (modulus); | |
1319 | ||
1320 | /* If this is a modular type, there are various possibilities | |
1321 | depending on the operation and whether the modulus is a | |
1322 | power of two or not. */ | |
1323 | ||
1324 | if (modulus) | |
1325 | { | |
1326 | gcc_assert (operation_type == base_type); | |
1327 | operand = convert (operation_type, operand); | |
1328 | ||
1329 | /* The fastest in the negate case for binary modulus is | |
1330 | the straightforward code; the TRUNC_MOD_EXPR below | |
1331 | is an AND operation. */ | |
1332 | if (op_code == NEGATE_EXPR && mod_pow2) | |
1333 | result = fold_build2 (TRUNC_MOD_EXPR, operation_type, | |
1334 | fold_build1 (NEGATE_EXPR, operation_type, | |
1335 | operand), | |
1336 | modulus); | |
1337 | ||
1338 | /* For nonbinary negate case, return zero for zero operand, | |
1339 | else return the modulus minus the operand. If the modulus | |
1340 | is a power of two minus one, we can do the subtraction | |
1341 | as an XOR since it is equivalent and faster on most machines. */ | |
1342 | else if (op_code == NEGATE_EXPR && !mod_pow2) | |
1343 | { | |
1344 | if (integer_pow2p (fold_build2 (PLUS_EXPR, operation_type, | |
1345 | modulus, | |
1346 | convert (operation_type, | |
1347 | integer_one_node)))) | |
1348 | result = fold_build2 (BIT_XOR_EXPR, operation_type, | |
1349 | operand, modulus); | |
1350 | else | |
1351 | result = fold_build2 (MINUS_EXPR, operation_type, | |
1352 | modulus, operand); | |
1353 | ||
1354 | result = fold_build3 (COND_EXPR, operation_type, | |
1355 | fold_build2 (NE_EXPR, | |
1356 | integer_type_node, | |
1357 | operand, | |
1358 | convert | |
1359 | (operation_type, | |
1360 | integer_zero_node)), | |
1361 | result, operand); | |
1362 | } | |
1363 | else | |
1364 | { | |
1365 | /* For the NOT cases, we need a constant equal to | |
1366 | the modulus minus one. For a binary modulus, we | |
1367 | XOR against the constant and subtract the operand from | |
1368 | that constant for nonbinary modulus. */ | |
1369 | ||
1370 | tree cnst = fold_build2 (MINUS_EXPR, operation_type, modulus, | |
1371 | convert (operation_type, | |
1372 | integer_one_node)); | |
1373 | ||
1374 | if (mod_pow2) | |
1375 | result = fold_build2 (BIT_XOR_EXPR, operation_type, | |
1376 | operand, cnst); | |
1377 | else | |
1378 | result = fold_build2 (MINUS_EXPR, operation_type, | |
1379 | cnst, operand); | |
1380 | } | |
1381 | ||
1382 | break; | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | /* ... fall through ... */ | |
1387 | ||
1388 | default: | |
1389 | gcc_assert (operation_type == base_type); | |
1390 | result = fold_build1 (op_code, operation_type, | |
1391 | convert (operation_type, operand)); | |
1392 | } | |
1393 | ||
1394 | if (side_effects) | |
1395 | { | |
1396 | TREE_SIDE_EFFECTS (result) = 1; | |
1397 | if (TREE_CODE (result) == INDIRECT_REF) | |
1398 | TREE_THIS_VOLATILE (result) = TYPE_VOLATILE (TREE_TYPE (result)); | |
1399 | } | |
1400 | ||
1401 | if (result_type && TREE_TYPE (result) != result_type) | |
1402 | result = convert (result_type, result); | |
1403 | ||
1404 | return result; | |
1405 | } | |
1406 | \f | |
1407 | /* Similar, but for COND_EXPR. */ | |
1408 | ||
1409 | tree | |
1410 | build_cond_expr (tree result_type, tree condition_operand, | |
1411 | tree true_operand, tree false_operand) | |
1412 | { | |
1413 | tree result; | |
1414 | bool addr_p = false; | |
1415 | ||
1416 | /* The front-end verifies that result, true and false operands have same base | |
1417 | type. Convert everything to the result type. */ | |
1418 | ||
1419 | true_operand = convert (result_type, true_operand); | |
1420 | false_operand = convert (result_type, false_operand); | |
1421 | ||
1422 | /* If the result type is unconstrained, take the address of | |
1423 | the operands and then dereference our result. */ | |
1424 | if (TREE_CODE (result_type) == UNCONSTRAINED_ARRAY_TYPE | |
1425 | || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (result_type))) | |
1426 | { | |
1427 | addr_p = true; | |
1428 | result_type = build_pointer_type (result_type); | |
1429 | true_operand = build_unary_op (ADDR_EXPR, result_type, true_operand); | |
1430 | false_operand = build_unary_op (ADDR_EXPR, result_type, false_operand); | |
1431 | } | |
1432 | ||
1433 | result = fold_build3 (COND_EXPR, result_type, condition_operand, | |
1434 | true_operand, false_operand); | |
1435 | ||
1436 | /* If either operand is a SAVE_EXPR (possibly surrounded by | |
1437 | arithmetic, make sure it gets done. */ | |
1438 | true_operand = skip_simple_arithmetic (true_operand); | |
1439 | false_operand = skip_simple_arithmetic (false_operand); | |
1440 | ||
1441 | if (TREE_CODE (true_operand) == SAVE_EXPR) | |
1442 | result = build2 (COMPOUND_EXPR, result_type, true_operand, result); | |
1443 | ||
1444 | if (TREE_CODE (false_operand) == SAVE_EXPR) | |
1445 | result = build2 (COMPOUND_EXPR, result_type, false_operand, result); | |
1446 | ||
1447 | /* ??? Seems the code above is wrong, as it may move ahead of the COND | |
1448 | SAVE_EXPRs with side effects and not shared by both arms. */ | |
1449 | ||
1450 | if (addr_p) | |
1451 | result = build_unary_op (INDIRECT_REF, NULL_TREE, result); | |
1452 | ||
1453 | return result; | |
1454 | } | |
1455 | ||
1456 | /* Similar, but for RETURN_EXPR. If RESULT_DECL is non-zero, build | |
1457 | a RETURN_EXPR around the assignment of RET_VAL to RESULT_DECL. | |
1458 | If RESULT_DECL is zero, build a bare RETURN_EXPR. */ | |
1459 | ||
1460 | tree | |
1461 | build_return_expr (tree result_decl, tree ret_val) | |
1462 | { | |
1463 | tree result_expr; | |
1464 | ||
1465 | if (result_decl) | |
1466 | { | |
1467 | /* The gimplifier explicitly enforces the following invariant: | |
1468 | ||
1469 | RETURN_EXPR | |
1470 | | | |
1471 | MODIFY_EXPR | |
1472 | / \ | |
1473 | / \ | |
1474 | RESULT_DECL ... | |
1475 | ||
1476 | As a consequence, type-homogeneity dictates that we use the type | |
1477 | of the RESULT_DECL as the operation type. */ | |
1478 | ||
1479 | tree operation_type = TREE_TYPE (result_decl); | |
1480 | ||
1481 | /* Convert the right operand to the operation type. Note that | |
1482 | it's the same transformation as in the MODIFY_EXPR case of | |
1483 | build_binary_op with the additional guarantee that the type | |
1484 | cannot involve a placeholder, since otherwise the function | |
1485 | would use the "target pointer" return mechanism. */ | |
1486 | ||
1487 | if (operation_type != TREE_TYPE (ret_val)) | |
1488 | ret_val = convert (operation_type, ret_val); | |
1489 | ||
1490 | result_expr | |
1491 | = build2 (MODIFY_EXPR, operation_type, result_decl, ret_val); | |
1492 | } | |
1493 | else | |
1494 | result_expr = NULL_TREE; | |
1495 | ||
1496 | return build1 (RETURN_EXPR, void_type_node, result_expr); | |
1497 | } | |
1498 | \f | |
1499 | /* Build a CALL_EXPR to call FUNDECL with one argument, ARG. Return | |
1500 | the CALL_EXPR. */ | |
1501 | ||
1502 | tree | |
1503 | build_call_1_expr (tree fundecl, tree arg) | |
1504 | { | |
1505 | tree call = build_call_nary (TREE_TYPE (TREE_TYPE (fundecl)), | |
1506 | build_unary_op (ADDR_EXPR, NULL_TREE, fundecl), | |
1507 | 1, arg); | |
1508 | TREE_SIDE_EFFECTS (call) = 1; | |
1509 | return call; | |
1510 | } | |
1511 | ||
1512 | /* Build a CALL_EXPR to call FUNDECL with two arguments, ARG1 & ARG2. Return | |
1513 | the CALL_EXPR. */ | |
1514 | ||
1515 | tree | |
1516 | build_call_2_expr (tree fundecl, tree arg1, tree arg2) | |
1517 | { | |
1518 | tree call = build_call_nary (TREE_TYPE (TREE_TYPE (fundecl)), | |
1519 | build_unary_op (ADDR_EXPR, NULL_TREE, fundecl), | |
1520 | 2, arg1, arg2); | |
1521 | TREE_SIDE_EFFECTS (call) = 1; | |
1522 | return call; | |
1523 | } | |
1524 | ||
1525 | /* Likewise to call FUNDECL with no arguments. */ | |
1526 | ||
1527 | tree | |
1528 | build_call_0_expr (tree fundecl) | |
1529 | { | |
1530 | /* We rely on build_call_nary to compute TREE_SIDE_EFFECTS. This makes | |
1531 | it possible to propagate DECL_IS_PURE on parameterless functions. */ | |
1532 | tree call = build_call_nary (TREE_TYPE (TREE_TYPE (fundecl)), | |
1533 | build_unary_op (ADDR_EXPR, NULL_TREE, fundecl), | |
1534 | 0); | |
1535 | return call; | |
1536 | } | |
1537 | \f | |
1538 | /* Call a function that raises an exception and pass the line number and file | |
1539 | name, if requested. MSG says which exception function to call. | |
1540 | ||
1541 | GNAT_NODE is the gnat node conveying the source location for which the | |
1542 | error should be signaled, or Empty in which case the error is signaled on | |
1543 | the current ref_file_name/input_line. | |
1544 | ||
1545 | KIND says which kind of exception this is for | |
1546 | (N_Raise_{Constraint,Storage,Program}_Error). */ | |
1547 | ||
1548 | tree | |
1549 | build_call_raise (int msg, Node_Id gnat_node, char kind) | |
1550 | { | |
1551 | tree fndecl = gnat_raise_decls[msg]; | |
1552 | tree label = get_exception_label (kind); | |
1553 | tree filename; | |
1554 | int line_number; | |
1555 | const char *str; | |
1556 | int len; | |
1557 | ||
1558 | /* If this is to be done as a goto, handle that case. */ | |
1559 | if (label) | |
1560 | { | |
1561 | Entity_Id local_raise = Get_Local_Raise_Call_Entity (); | |
1562 | tree gnu_result = build1 (GOTO_EXPR, void_type_node, label); | |
1563 | ||
1564 | /* If Local_Raise is present, generate | |
1565 | Local_Raise (exception'Identity); */ | |
1566 | if (Present (local_raise)) | |
1567 | { | |
1568 | tree gnu_local_raise | |
1569 | = gnat_to_gnu_entity (local_raise, NULL_TREE, 0); | |
1570 | tree gnu_exception_entity | |
1571 | = gnat_to_gnu_entity (Get_RT_Exception_Entity (msg), NULL_TREE, 0); | |
1572 | tree gnu_call | |
1573 | = build_call_1_expr (gnu_local_raise, | |
1574 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
1575 | gnu_exception_entity)); | |
1576 | ||
1577 | gnu_result = build2 (COMPOUND_EXPR, void_type_node, | |
1578 | gnu_call, gnu_result);} | |
1579 | ||
1580 | return gnu_result; | |
1581 | } | |
1582 | ||
1583 | str | |
1584 | = (Debug_Flag_NN || Exception_Locations_Suppressed) | |
1585 | ? "" | |
1586 | : (gnat_node != Empty && Sloc (gnat_node) != No_Location) | |
1587 | ? IDENTIFIER_POINTER | |
1588 | (get_identifier (Get_Name_String | |
1589 | (Debug_Source_Name | |
1590 | (Get_Source_File_Index (Sloc (gnat_node)))))) | |
1591 | : ref_filename; | |
1592 | ||
26383c64 | 1593 | len = strlen (str); |
a1ab4c31 AC |
1594 | filename = build_string (len, str); |
1595 | line_number | |
1596 | = (gnat_node != Empty && Sloc (gnat_node) != No_Location) | |
1597 | ? Get_Logical_Line_Number (Sloc(gnat_node)) : input_line; | |
1598 | ||
1599 | TREE_TYPE (filename) | |
26383c64 | 1600 | = build_array_type (char_type_node, build_index_type (size_int (len))); |
a1ab4c31 AC |
1601 | |
1602 | return | |
1603 | build_call_2_expr (fndecl, | |
1604 | build1 (ADDR_EXPR, build_pointer_type (char_type_node), | |
1605 | filename), | |
1606 | build_int_cst (NULL_TREE, line_number)); | |
1607 | } | |
1608 | \f | |
1609 | /* qsort comparer for the bit positions of two constructor elements | |
1610 | for record components. */ | |
1611 | ||
1612 | static int | |
1613 | compare_elmt_bitpos (const PTR rt1, const PTR rt2) | |
1614 | { | |
1615 | const_tree const elmt1 = * (const_tree const *) rt1; | |
1616 | const_tree const elmt2 = * (const_tree const *) rt2; | |
1617 | const_tree const field1 = TREE_PURPOSE (elmt1); | |
1618 | const_tree const field2 = TREE_PURPOSE (elmt2); | |
1619 | const int ret | |
1620 | = tree_int_cst_compare (bit_position (field1), bit_position (field2)); | |
1621 | ||
1622 | return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); | |
1623 | } | |
1624 | ||
1625 | /* Return a CONSTRUCTOR of TYPE whose list is LIST. */ | |
1626 | ||
1627 | tree | |
1628 | gnat_build_constructor (tree type, tree list) | |
1629 | { | |
1630 | tree elmt; | |
1631 | int n_elmts; | |
1632 | bool allconstant = (TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST); | |
1633 | bool side_effects = false; | |
1634 | tree result; | |
1635 | ||
1636 | /* Scan the elements to see if they are all constant or if any has side | |
1637 | effects, to let us set global flags on the resulting constructor. Count | |
1638 | the elements along the way for possible sorting purposes below. */ | |
1639 | for (n_elmts = 0, elmt = list; elmt; elmt = TREE_CHAIN (elmt), n_elmts ++) | |
1640 | { | |
1641 | if (!TREE_CONSTANT (TREE_VALUE (elmt)) | |
1642 | || (TREE_CODE (type) == RECORD_TYPE | |
1643 | && DECL_BIT_FIELD (TREE_PURPOSE (elmt)) | |
1644 | && TREE_CODE (TREE_VALUE (elmt)) != INTEGER_CST) | |
1645 | || !initializer_constant_valid_p (TREE_VALUE (elmt), | |
1646 | TREE_TYPE (TREE_VALUE (elmt)))) | |
1647 | allconstant = false; | |
1648 | ||
1649 | if (TREE_SIDE_EFFECTS (TREE_VALUE (elmt))) | |
1650 | side_effects = true; | |
1651 | ||
1652 | /* Propagate an NULL_EXPR from the size of the type. We won't ever | |
1653 | be executing the code we generate here in that case, but handle it | |
1654 | specially to avoid the compiler blowing up. */ | |
1655 | if (TREE_CODE (type) == RECORD_TYPE | |
1656 | && (0 != (result | |
1657 | = contains_null_expr (DECL_SIZE (TREE_PURPOSE (elmt)))))) | |
1658 | return build1 (NULL_EXPR, type, TREE_OPERAND (result, 0)); | |
1659 | } | |
1660 | ||
1661 | /* For record types with constant components only, sort field list | |
1662 | by increasing bit position. This is necessary to ensure the | |
1663 | constructor can be output as static data. */ | |
1664 | if (allconstant && TREE_CODE (type) == RECORD_TYPE && n_elmts > 1) | |
1665 | { | |
1666 | /* Fill an array with an element tree per index, and ask qsort to order | |
1667 | them according to what a bitpos comparison function says. */ | |
1668 | tree *gnu_arr = (tree *) alloca (sizeof (tree) * n_elmts); | |
1669 | int i; | |
1670 | ||
1671 | for (i = 0, elmt = list; elmt; elmt = TREE_CHAIN (elmt), i++) | |
1672 | gnu_arr[i] = elmt; | |
1673 | ||
1674 | qsort (gnu_arr, n_elmts, sizeof (tree), compare_elmt_bitpos); | |
1675 | ||
1676 | /* Then reconstruct the list from the sorted array contents. */ | |
1677 | list = NULL_TREE; | |
1678 | for (i = n_elmts - 1; i >= 0; i--) | |
1679 | { | |
1680 | TREE_CHAIN (gnu_arr[i]) = list; | |
1681 | list = gnu_arr[i]; | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | result = build_constructor_from_list (type, list); | |
1686 | TREE_CONSTANT (result) = TREE_STATIC (result) = allconstant; | |
1687 | TREE_SIDE_EFFECTS (result) = side_effects; | |
1688 | TREE_READONLY (result) = TYPE_READONLY (type) || allconstant; | |
1689 | return result; | |
1690 | } | |
1691 | \f | |
1692 | /* Return a COMPONENT_REF to access a field that is given by COMPONENT, | |
1693 | an IDENTIFIER_NODE giving the name of the field, or FIELD, a FIELD_DECL, | |
1694 | for the field. Don't fold the result if NO_FOLD_P is true. | |
1695 | ||
1696 | We also handle the fact that we might have been passed a pointer to the | |
1697 | actual record and know how to look for fields in variant parts. */ | |
1698 | ||
1699 | static tree | |
1700 | build_simple_component_ref (tree record_variable, tree component, | |
1701 | tree field, bool no_fold_p) | |
1702 | { | |
1703 | tree record_type = TYPE_MAIN_VARIANT (TREE_TYPE (record_variable)); | |
1704 | tree ref, inner_variable; | |
1705 | ||
1706 | gcc_assert ((TREE_CODE (record_type) == RECORD_TYPE | |
1707 | || TREE_CODE (record_type) == UNION_TYPE | |
1708 | || TREE_CODE (record_type) == QUAL_UNION_TYPE) | |
1709 | && TYPE_SIZE (record_type) | |
1710 | && (component != 0) != (field != 0)); | |
1711 | ||
1712 | /* If no field was specified, look for a field with the specified name | |
1713 | in the current record only. */ | |
1714 | if (!field) | |
1715 | for (field = TYPE_FIELDS (record_type); field; | |
1716 | field = TREE_CHAIN (field)) | |
1717 | if (DECL_NAME (field) == component) | |
1718 | break; | |
1719 | ||
1720 | if (!field) | |
1721 | return NULL_TREE; | |
1722 | ||
1723 | /* If this field is not in the specified record, see if we can find | |
1724 | something in the record whose original field is the same as this one. */ | |
1725 | if (DECL_CONTEXT (field) != record_type) | |
1726 | /* Check if there is a field with name COMPONENT in the record. */ | |
1727 | { | |
1728 | tree new_field; | |
1729 | ||
1730 | /* First loop thru normal components. */ | |
1731 | ||
1732 | for (new_field = TYPE_FIELDS (record_type); new_field; | |
1733 | new_field = TREE_CHAIN (new_field)) | |
1734 | if (field == new_field | |
1735 | || DECL_ORIGINAL_FIELD (new_field) == field | |
1736 | || new_field == DECL_ORIGINAL_FIELD (field) | |
1737 | || (DECL_ORIGINAL_FIELD (field) | |
1738 | && (DECL_ORIGINAL_FIELD (field) | |
1739 | == DECL_ORIGINAL_FIELD (new_field)))) | |
1740 | break; | |
1741 | ||
1742 | /* Next, loop thru DECL_INTERNAL_P components if we haven't found | |
1743 | the component in the first search. Doing this search in 2 steps | |
1744 | is required to avoiding hidden homonymous fields in the | |
1745 | _Parent field. */ | |
1746 | ||
1747 | if (!new_field) | |
1748 | for (new_field = TYPE_FIELDS (record_type); new_field; | |
1749 | new_field = TREE_CHAIN (new_field)) | |
1750 | if (DECL_INTERNAL_P (new_field)) | |
1751 | { | |
1752 | tree field_ref | |
1753 | = build_simple_component_ref (record_variable, | |
1754 | NULL_TREE, new_field, no_fold_p); | |
1755 | ref = build_simple_component_ref (field_ref, NULL_TREE, field, | |
1756 | no_fold_p); | |
1757 | ||
1758 | if (ref) | |
1759 | return ref; | |
1760 | } | |
1761 | ||
1762 | field = new_field; | |
1763 | } | |
1764 | ||
1765 | if (!field) | |
1766 | return NULL_TREE; | |
1767 | ||
1768 | /* If the field's offset has overflowed, do not attempt to access it | |
1769 | as doing so may trigger sanity checks deeper in the back-end. | |
1770 | Note that we don't need to warn since this will be done on trying | |
1771 | to declare the object. */ | |
1772 | if (TREE_CODE (DECL_FIELD_OFFSET (field)) == INTEGER_CST | |
1773 | && TREE_OVERFLOW (DECL_FIELD_OFFSET (field))) | |
1774 | return NULL_TREE; | |
1775 | ||
1776 | /* Look through conversion between type variants. Note that this | |
1777 | is transparent as far as the field is concerned. */ | |
1778 | if (TREE_CODE (record_variable) == VIEW_CONVERT_EXPR | |
1779 | && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (record_variable, 0))) | |
1780 | == record_type) | |
1781 | inner_variable = TREE_OPERAND (record_variable, 0); | |
1782 | else | |
1783 | inner_variable = record_variable; | |
1784 | ||
1785 | ref = build3 (COMPONENT_REF, TREE_TYPE (field), inner_variable, field, | |
1786 | NULL_TREE); | |
1787 | ||
1788 | if (TREE_READONLY (record_variable) || TREE_READONLY (field)) | |
1789 | TREE_READONLY (ref) = 1; | |
1790 | if (TREE_THIS_VOLATILE (record_variable) || TREE_THIS_VOLATILE (field) | |
1791 | || TYPE_VOLATILE (record_type)) | |
1792 | TREE_THIS_VOLATILE (ref) = 1; | |
1793 | ||
1794 | if (no_fold_p) | |
1795 | return ref; | |
1796 | ||
1797 | /* The generic folder may punt in this case because the inner array type | |
1798 | can be self-referential, but folding is in fact not problematic. */ | |
1799 | else if (TREE_CODE (record_variable) == CONSTRUCTOR | |
1800 | && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (record_variable))) | |
1801 | { | |
1802 | VEC(constructor_elt,gc) *elts = CONSTRUCTOR_ELTS (record_variable); | |
1803 | unsigned HOST_WIDE_INT idx; | |
1804 | tree index, value; | |
1805 | FOR_EACH_CONSTRUCTOR_ELT (elts, idx, index, value) | |
1806 | if (index == field) | |
1807 | return value; | |
1808 | return ref; | |
1809 | } | |
1810 | ||
1811 | else | |
1812 | return fold (ref); | |
1813 | } | |
1814 | \f | |
1815 | /* Like build_simple_component_ref, except that we give an error if the | |
1816 | reference could not be found. */ | |
1817 | ||
1818 | tree | |
1819 | build_component_ref (tree record_variable, tree component, | |
1820 | tree field, bool no_fold_p) | |
1821 | { | |
1822 | tree ref = build_simple_component_ref (record_variable, component, field, | |
1823 | no_fold_p); | |
1824 | ||
1825 | if (ref) | |
1826 | return ref; | |
1827 | ||
c1abd261 EB |
1828 | /* If FIELD was specified, assume this is an invalid user field so raise |
1829 | Constraint_Error. Otherwise, we have no type to return so abort. */ | |
a1ab4c31 AC |
1830 | gcc_assert (field); |
1831 | return build1 (NULL_EXPR, TREE_TYPE (field), | |
1832 | build_call_raise (CE_Discriminant_Check_Failed, Empty, | |
1833 | N_Raise_Constraint_Error)); | |
1834 | } | |
1835 | \f | |
1836 | /* Build a GCC tree to call an allocation or deallocation function. | |
1837 | If GNU_OBJ is nonzero, it is an object to deallocate. Otherwise, | |
1838 | generate an allocator. | |
1839 | ||
1840 | GNU_SIZE is the size of the object in bytes and ALIGN is the alignment in | |
1841 | bits. GNAT_PROC, if present, is a procedure to call and GNAT_POOL is the | |
1842 | storage pool to use. If not preset, malloc and free will be used except | |
1843 | if GNAT_PROC is the "fake" value of -1, in which case we allocate the | |
1844 | object dynamically on the stack frame. */ | |
1845 | ||
1846 | tree | |
1847 | build_call_alloc_dealloc (tree gnu_obj, tree gnu_size, unsigned align, | |
1848 | Entity_Id gnat_proc, Entity_Id gnat_pool, | |
1849 | Node_Id gnat_node) | |
1850 | { | |
1851 | tree gnu_align = size_int (align / BITS_PER_UNIT); | |
1852 | ||
1853 | gnu_size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_size, gnu_obj); | |
1854 | ||
1855 | if (Present (gnat_proc)) | |
1856 | { | |
1857 | /* The storage pools are obviously always tagged types, but the | |
1858 | secondary stack uses the same mechanism and is not tagged */ | |
1859 | if (Is_Tagged_Type (Etype (gnat_pool))) | |
1860 | { | |
1861 | /* The size is the third parameter; the alignment is the | |
1862 | same type. */ | |
1863 | Entity_Id gnat_size_type | |
1864 | = Etype (Next_Formal (Next_Formal (First_Formal (gnat_proc)))); | |
1865 | tree gnu_size_type = gnat_to_gnu_type (gnat_size_type); | |
1866 | tree gnu_proc = gnat_to_gnu (gnat_proc); | |
1867 | tree gnu_proc_addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_proc); | |
1868 | tree gnu_pool = gnat_to_gnu (gnat_pool); | |
1869 | tree gnu_pool_addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_pool); | |
1870 | tree gnu_call; | |
1871 | ||
1872 | gnu_size = convert (gnu_size_type, gnu_size); | |
1873 | gnu_align = convert (gnu_size_type, gnu_align); | |
1874 | ||
1875 | /* The first arg is always the address of the storage pool; next | |
1876 | comes the address of the object, for a deallocator, then the | |
1877 | size and alignment. */ | |
1878 | if (gnu_obj) | |
1879 | gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)), | |
1880 | gnu_proc_addr, 4, gnu_pool_addr, | |
1881 | gnu_obj, gnu_size, gnu_align); | |
1882 | else | |
1883 | gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)), | |
1884 | gnu_proc_addr, 3, gnu_pool_addr, | |
1885 | gnu_size, gnu_align); | |
1886 | TREE_SIDE_EFFECTS (gnu_call) = 1; | |
1887 | return gnu_call; | |
1888 | } | |
1889 | ||
1890 | /* Secondary stack case. */ | |
1891 | else | |
1892 | { | |
1893 | /* The size is the second parameter */ | |
1894 | Entity_Id gnat_size_type | |
1895 | = Etype (Next_Formal (First_Formal (gnat_proc))); | |
1896 | tree gnu_size_type = gnat_to_gnu_type (gnat_size_type); | |
1897 | tree gnu_proc = gnat_to_gnu (gnat_proc); | |
1898 | tree gnu_proc_addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_proc); | |
1899 | tree gnu_call; | |
1900 | ||
1901 | gnu_size = convert (gnu_size_type, gnu_size); | |
1902 | ||
1903 | /* The first arg is the address of the object, for a | |
1904 | deallocator, then the size */ | |
1905 | if (gnu_obj) | |
1906 | gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)), | |
1907 | gnu_proc_addr, 2, gnu_obj, gnu_size); | |
1908 | else | |
1909 | gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)), | |
1910 | gnu_proc_addr, 1, gnu_size); | |
1911 | TREE_SIDE_EFFECTS (gnu_call) = 1; | |
1912 | return gnu_call; | |
1913 | } | |
1914 | } | |
1915 | ||
1916 | else if (gnu_obj) | |
1917 | return build_call_1_expr (free_decl, gnu_obj); | |
1918 | ||
1919 | /* ??? For now, disable variable-sized allocators in the stack since | |
1920 | we can't yet gimplify an ALLOCATE_EXPR. */ | |
1921 | else if (gnat_pool == -1 | |
b38f3813 EB |
1922 | && TREE_CODE (gnu_size) == INTEGER_CST |
1923 | && flag_stack_check != GENERIC_STACK_CHECK) | |
a1ab4c31 AC |
1924 | { |
1925 | /* If the size is a constant, we can put it in the fixed portion of | |
1926 | the stack frame to avoid the need to adjust the stack pointer. */ | |
a1ab4c31 | 1927 | { |
26383c64 EB |
1928 | tree gnu_index = build_index_2_type (size_one_node, gnu_size); |
1929 | tree gnu_array_type = build_array_type (char_type_node, gnu_index); | |
a1ab4c31 AC |
1930 | tree gnu_decl |
1931 | = create_var_decl (get_identifier ("RETVAL"), NULL_TREE, | |
1932 | gnu_array_type, NULL_TREE, false, false, false, | |
1933 | false, NULL, gnat_node); | |
a1ab4c31 AC |
1934 | return convert (ptr_void_type_node, |
1935 | build_unary_op (ADDR_EXPR, NULL_TREE, gnu_decl)); | |
1936 | } | |
a1ab4c31 | 1937 | #if 0 |
b38f3813 | 1938 | else |
a1ab4c31 AC |
1939 | return build2 (ALLOCATE_EXPR, ptr_void_type_node, gnu_size, gnu_align); |
1940 | #endif | |
1941 | } | |
1942 | else | |
1943 | { | |
1944 | if (Nkind (gnat_node) != N_Allocator || !Comes_From_Source (gnat_node)) | |
1945 | Check_No_Implicit_Heap_Alloc (gnat_node); | |
1946 | ||
1947 | /* If the allocator size is 32bits but the pointer size is 64bits then | |
1948 | allocate 32bit memory (sometimes necessary on 64bit VMS). Otherwise | |
1949 | default to standard malloc. */ | |
f0a631aa DR |
1950 | if (TARGET_ABI_OPEN_VMS && |
1951 | (!TARGET_MALLOC64 || | |
1952 | (POINTER_SIZE == 64 | |
1953 | && (UI_To_Int (Esize (Etype (gnat_node))) == 32 | |
1954 | || Convention (Etype (gnat_node)) == Convention_C)))) | |
a1ab4c31 AC |
1955 | return build_call_1_expr (malloc32_decl, gnu_size); |
1956 | else | |
1957 | return build_call_1_expr (malloc_decl, gnu_size); | |
1958 | } | |
1959 | } | |
1960 | \f | |
1961 | /* Build a GCC tree to correspond to allocating an object of TYPE whose | |
1962 | initial value is INIT, if INIT is nonzero. Convert the expression to | |
1963 | RESULT_TYPE, which must be some type of pointer. Return the tree. | |
1964 | GNAT_PROC and GNAT_POOL optionally give the procedure to call and | |
1965 | the storage pool to use. GNAT_NODE is used to provide an error | |
1966 | location for restriction violations messages. If IGNORE_INIT_TYPE is | |
1967 | true, ignore the type of INIT for the purpose of determining the size; | |
1968 | this will cause the maximum size to be allocated if TYPE is of | |
1969 | self-referential size. */ | |
1970 | ||
1971 | tree | |
1972 | build_allocator (tree type, tree init, tree result_type, Entity_Id gnat_proc, | |
1973 | Entity_Id gnat_pool, Node_Id gnat_node, bool ignore_init_type) | |
1974 | { | |
1975 | tree size = TYPE_SIZE_UNIT (type); | |
1976 | tree result; | |
1977 | unsigned int default_allocator_alignment | |
1978 | = get_target_default_allocator_alignment () * BITS_PER_UNIT; | |
1979 | ||
1980 | /* If the initializer, if present, is a NULL_EXPR, just return a new one. */ | |
1981 | if (init && TREE_CODE (init) == NULL_EXPR) | |
1982 | return build1 (NULL_EXPR, result_type, TREE_OPERAND (init, 0)); | |
1983 | ||
1984 | /* If RESULT_TYPE is a fat or thin pointer, set SIZE to be the sum of the | |
1985 | sizes of the object and its template. Allocate the whole thing and | |
1986 | fill in the parts that are known. */ | |
1987 | else if (TYPE_FAT_OR_THIN_POINTER_P (result_type)) | |
1988 | { | |
1989 | tree storage_type | |
1990 | = build_unc_object_type_from_ptr (result_type, type, | |
1991 | get_identifier ("ALLOC")); | |
1992 | tree template_type = TREE_TYPE (TYPE_FIELDS (storage_type)); | |
1993 | tree storage_ptr_type = build_pointer_type (storage_type); | |
1994 | tree storage; | |
1995 | tree template_cons = NULL_TREE; | |
1996 | ||
1997 | size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (storage_type), | |
1998 | init); | |
1999 | ||
2000 | /* If the size overflows, pass -1 so the allocator will raise | |
2001 | storage error. */ | |
2002 | if (TREE_CODE (size) == INTEGER_CST && TREE_OVERFLOW (size)) | |
2003 | size = ssize_int (-1); | |
2004 | ||
2005 | storage = build_call_alloc_dealloc (NULL_TREE, size, | |
2006 | TYPE_ALIGN (storage_type), | |
2007 | gnat_proc, gnat_pool, gnat_node); | |
2008 | storage = convert (storage_ptr_type, protect_multiple_eval (storage)); | |
2009 | ||
2010 | if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) | |
2011 | { | |
2012 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
2013 | ||
2014 | if (init) | |
2015 | init = convert (type, init); | |
2016 | } | |
2017 | ||
2018 | /* If there is an initializing expression, make a constructor for | |
2019 | the entire object including the bounds and copy it into the | |
2020 | object. If there is no initializing expression, just set the | |
2021 | bounds. */ | |
2022 | if (init) | |
2023 | { | |
2024 | template_cons = tree_cons (TREE_CHAIN (TYPE_FIELDS (storage_type)), | |
2025 | init, NULL_TREE); | |
2026 | template_cons = tree_cons (TYPE_FIELDS (storage_type), | |
2027 | build_template (template_type, type, | |
2028 | init), | |
2029 | template_cons); | |
2030 | ||
2031 | return convert | |
2032 | (result_type, | |
2033 | build2 (COMPOUND_EXPR, storage_ptr_type, | |
2034 | build_binary_op | |
2035 | (MODIFY_EXPR, storage_type, | |
2036 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
2037 | convert (storage_ptr_type, storage)), | |
2038 | gnat_build_constructor (storage_type, template_cons)), | |
2039 | convert (storage_ptr_type, storage))); | |
2040 | } | |
2041 | else | |
2042 | return build2 | |
2043 | (COMPOUND_EXPR, result_type, | |
2044 | build_binary_op | |
2045 | (MODIFY_EXPR, template_type, | |
2046 | build_component_ref | |
2047 | (build_unary_op (INDIRECT_REF, NULL_TREE, | |
2048 | convert (storage_ptr_type, storage)), | |
2049 | NULL_TREE, TYPE_FIELDS (storage_type), 0), | |
2050 | build_template (template_type, type, NULL_TREE)), | |
2051 | convert (result_type, convert (storage_ptr_type, storage))); | |
2052 | } | |
2053 | ||
2054 | /* If we have an initializing expression, see if its size is simpler | |
2055 | than the size from the type. */ | |
2056 | if (!ignore_init_type && init && TYPE_SIZE_UNIT (TREE_TYPE (init)) | |
2057 | && (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (init))) == INTEGER_CST | |
2058 | || CONTAINS_PLACEHOLDER_P (size))) | |
2059 | size = TYPE_SIZE_UNIT (TREE_TYPE (init)); | |
2060 | ||
2061 | /* If the size is still self-referential, reference the initializing | |
2062 | expression, if it is present. If not, this must have been a | |
2063 | call to allocate a library-level object, in which case we use | |
2064 | the maximum size. */ | |
2065 | if (CONTAINS_PLACEHOLDER_P (size)) | |
2066 | { | |
2067 | if (!ignore_init_type && init) | |
2068 | size = substitute_placeholder_in_expr (size, init); | |
2069 | else | |
2070 | size = max_size (size, true); | |
2071 | } | |
2072 | ||
2073 | /* If the size overflows, pass -1 so the allocator will raise | |
2074 | storage error. */ | |
2075 | if (TREE_CODE (size) == INTEGER_CST && TREE_OVERFLOW (size)) | |
2076 | size = ssize_int (-1); | |
2077 | ||
2078 | /* If this is in the default storage pool and the type alignment is larger | |
2079 | than what the default allocator supports, make an "aligning" record type | |
2080 | with room to store a pointer before the field, allocate an object of that | |
2081 | type, store the system's allocator return value just in front of the | |
2082 | field and return the field's address. */ | |
2083 | ||
2084 | if (No (gnat_proc) && TYPE_ALIGN (type) > default_allocator_alignment) | |
2085 | { | |
2086 | /* Construct the aligning type with enough room for a pointer ahead | |
2087 | of the field, then allocate. */ | |
2088 | tree record_type | |
2089 | = make_aligning_type (type, TYPE_ALIGN (type), size, | |
2090 | default_allocator_alignment, | |
2091 | POINTER_SIZE / BITS_PER_UNIT); | |
2092 | ||
2093 | tree record, record_addr; | |
2094 | ||
2095 | record_addr | |
2096 | = build_call_alloc_dealloc (NULL_TREE, TYPE_SIZE_UNIT (record_type), | |
2097 | default_allocator_alignment, Empty, Empty, | |
2098 | gnat_node); | |
2099 | ||
2100 | record_addr | |
2101 | = convert (build_pointer_type (record_type), | |
2102 | save_expr (record_addr)); | |
2103 | ||
2104 | record = build_unary_op (INDIRECT_REF, NULL_TREE, record_addr); | |
2105 | ||
2106 | /* Our RESULT (the Ada allocator's value) is the super-aligned address | |
2107 | of the internal record field ... */ | |
2108 | result | |
2109 | = build_unary_op (ADDR_EXPR, NULL_TREE, | |
2110 | build_component_ref | |
2111 | (record, NULL_TREE, TYPE_FIELDS (record_type), 0)); | |
2112 | result = convert (result_type, result); | |
2113 | ||
2114 | /* ... with the system allocator's return value stored just in | |
2115 | front. */ | |
2116 | { | |
2117 | tree ptr_addr | |
2118 | = build_binary_op (POINTER_PLUS_EXPR, ptr_void_type_node, | |
2119 | convert (ptr_void_type_node, result), | |
2120 | size_int (-POINTER_SIZE/BITS_PER_UNIT)); | |
2121 | ||
2122 | tree ptr_ref | |
2123 | = convert (build_pointer_type (ptr_void_type_node), ptr_addr); | |
2124 | ||
2125 | result | |
2126 | = build2 (COMPOUND_EXPR, TREE_TYPE (result), | |
2127 | build_binary_op (MODIFY_EXPR, NULL_TREE, | |
2128 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
2129 | ptr_ref), | |
2130 | convert (ptr_void_type_node, | |
2131 | record_addr)), | |
2132 | result); | |
2133 | } | |
2134 | } | |
2135 | else | |
2136 | result = convert (result_type, | |
2137 | build_call_alloc_dealloc (NULL_TREE, size, | |
2138 | TYPE_ALIGN (type), | |
2139 | gnat_proc, | |
2140 | gnat_pool, | |
2141 | gnat_node)); | |
2142 | ||
2143 | /* If we have an initial value, put the new address into a SAVE_EXPR, assign | |
2144 | the value, and return the address. Do this with a COMPOUND_EXPR. */ | |
2145 | ||
2146 | if (init) | |
2147 | { | |
2148 | result = save_expr (result); | |
2149 | result | |
2150 | = build2 (COMPOUND_EXPR, TREE_TYPE (result), | |
2151 | build_binary_op | |
2152 | (MODIFY_EXPR, NULL_TREE, | |
2153 | build_unary_op (INDIRECT_REF, | |
2154 | TREE_TYPE (TREE_TYPE (result)), result), | |
2155 | init), | |
2156 | result); | |
2157 | } | |
2158 | ||
2159 | return convert (result_type, result); | |
2160 | } | |
2161 | \f | |
2162 | /* Fill in a VMS descriptor for EXPR and return a constructor for it. | |
6ca2b0a0 | 2163 | GNAT_FORMAL is how we find the descriptor record. GNAT_ACTUAL is |
819fad69 AC |
2164 | how we derive the source location to raise C_E on an out of range |
2165 | pointer. */ | |
a1ab4c31 AC |
2166 | |
2167 | tree | |
819fad69 | 2168 | fill_vms_descriptor (tree expr, Entity_Id gnat_formal, Node_Id gnat_actual) |
a1ab4c31 | 2169 | { |
a1ab4c31 | 2170 | tree field; |
6ca2b0a0 | 2171 | tree parm_decl = get_gnu_tree (gnat_formal); |
a1ab4c31 | 2172 | tree const_list = NULL_TREE; |
bdc33a55 AC |
2173 | tree record_type = TREE_TYPE (TREE_TYPE (parm_decl)); |
2174 | int do_range_check = | |
2175 | strcmp ("MBO", | |
2176 | IDENTIFIER_POINTER (DECL_NAME (TYPE_FIELDS (record_type)))); | |
6ca2b0a0 | 2177 | |
a1ab4c31 AC |
2178 | expr = maybe_unconstrained_array (expr); |
2179 | gnat_mark_addressable (expr); | |
2180 | ||
2181 | for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field)) | |
bdc33a55 AC |
2182 | { |
2183 | tree conexpr = convert (TREE_TYPE (field), | |
2184 | SUBSTITUTE_PLACEHOLDER_IN_EXPR | |
2185 | (DECL_INITIAL (field), expr)); | |
2186 | ||
2187 | /* Check to ensure that only 32bit pointers are passed in | |
2188 | 32bit descriptors */ | |
2189 | if (do_range_check && | |
2190 | strcmp (IDENTIFIER_POINTER (DECL_NAME (field)), "POINTER") == 0) | |
2191 | { | |
819fad69 AC |
2192 | tree pointer64type = |
2193 | build_pointer_type_for_mode (void_type_node, DImode, false); | |
2194 | tree addr64expr = build_unary_op (ADDR_EXPR, pointer64type, expr); | |
2195 | tree malloc64low = | |
2196 | build_int_cstu (long_integer_type_node, 0x80000000); | |
2197 | ||
2198 | add_stmt (build3 (COND_EXPR, void_type_node, | |
2199 | build_binary_op (GE_EXPR, long_integer_type_node, | |
2200 | convert (long_integer_type_node, | |
b7babd5d | 2201 | addr64expr), |
819fad69 AC |
2202 | malloc64low), |
2203 | build_call_raise (CE_Range_Check_Failed, gnat_actual, | |
2204 | N_Raise_Constraint_Error), | |
2205 | NULL_TREE)); | |
bdc33a55 AC |
2206 | } |
2207 | const_list = tree_cons (field, conexpr, const_list); | |
2208 | } | |
a1ab4c31 AC |
2209 | |
2210 | return gnat_build_constructor (record_type, nreverse (const_list)); | |
2211 | } | |
2212 | ||
2213 | /* Indicate that we need to make the address of EXPR_NODE and it therefore | |
2214 | should not be allocated in a register. Returns true if successful. */ | |
2215 | ||
2216 | bool | |
2217 | gnat_mark_addressable (tree expr_node) | |
2218 | { | |
2219 | while (1) | |
2220 | switch (TREE_CODE (expr_node)) | |
2221 | { | |
2222 | case ADDR_EXPR: | |
2223 | case COMPONENT_REF: | |
2224 | case ARRAY_REF: | |
2225 | case ARRAY_RANGE_REF: | |
2226 | case REALPART_EXPR: | |
2227 | case IMAGPART_EXPR: | |
2228 | case VIEW_CONVERT_EXPR: | |
2229 | case NON_LVALUE_EXPR: | |
2230 | CASE_CONVERT: | |
2231 | expr_node = TREE_OPERAND (expr_node, 0); | |
2232 | break; | |
2233 | ||
2234 | case CONSTRUCTOR: | |
2235 | TREE_ADDRESSABLE (expr_node) = 1; | |
2236 | return true; | |
2237 | ||
2238 | case VAR_DECL: | |
2239 | case PARM_DECL: | |
2240 | case RESULT_DECL: | |
2241 | TREE_ADDRESSABLE (expr_node) = 1; | |
2242 | return true; | |
2243 | ||
2244 | case FUNCTION_DECL: | |
2245 | TREE_ADDRESSABLE (expr_node) = 1; | |
2246 | return true; | |
2247 | ||
2248 | case CONST_DECL: | |
2249 | return (DECL_CONST_CORRESPONDING_VAR (expr_node) | |
2250 | && (gnat_mark_addressable | |
2251 | (DECL_CONST_CORRESPONDING_VAR (expr_node)))); | |
2252 | default: | |
2253 | return true; | |
2254 | } | |
2255 | } |