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概要[]
引数[]
- enum tree_code code
- tree type
- tree op0
- tree op1
- MEM_STAT_DECL
実装[]
10487 /* Fold a binary tree expression with code CODE of type TYPE with
10488 operands OP0 and OP1. Return a folded expression if successful.
10489 Otherwise, return a tree expression with code CODE of type TYPE
10490 with operands OP0 and OP1. */
10491
10492 tree
10493 fold_build2_stat (enum tree_code code, tree type, tree op0, tree op1
10494 MEM_STAT_DECL)
10495 {
10496 tree tem;
10497 #ifdef ENABLE_FOLD_CHECKING
10498 unsigned char checksum_before_op0[16],
10499 checksum_before_op1[16],
10500 checksum_after_op0[16],
10501 checksum_after_op1[16];
10502 struct md5_ctx ctx;
10503 htab_t ht;
10504
10505 ht = htab_create (32, htab_hash_pointer, htab_eq_pointer, NULL);
10506 md5_init_ctx (&ctx);
10507 fold_checksum_tree (op0, &ctx, ht);
10508 md5_finish_ctx (&ctx, checksum_before_op0);
10509 htab_empty (ht);
10510
10511 md5_init_ctx (&ctx);
10512 fold_checksum_tree (op1, &ctx, ht);
10513 md5_finish_ctx (&ctx, checksum_before_op1);
10514 htab_empty (ht);
10515 #endif
10516
10517 tem = fold_binary (code, type, op0, op1);
10518 if (!tem)
10519 tem = build2_stat (code, type, op0, op1 PASS_MEM_STAT);
10520
10521 #ifdef ENABLE_FOLD_CHECKING
10522 md5_init_ctx (&ctx);
10523 fold_checksum_tree (op0, &ctx, ht);
10524 md5_finish_ctx (&ctx, checksum_after_op0);
10525 htab_empty (ht);
10526
10527 if (memcmp (checksum_before_op0, checksum_after_op0, 16))
10528 fold_check_failed (op0, tem);
10529
10530 md5_init_ctx (&ctx);
10531 fold_checksum_tree (op1, &ctx, ht);
10532 md5_finish_ctx (&ctx, checksum_after_op1);
10533 htab_delete (ht);
10534
10535 if (memcmp (checksum_before_op1, checksum_after_op1, 16))
10536 fold_check_failed (op1, tem);
10537 #endif
10538 return tem;
10539 }