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概要

引数

実装

 10541 /* Fold a ternary tree expression with code CODE of type TYPE with
 10542    operands OP0, OP1, and OP2.  Return a folded expression if
 10543    successful.  Otherwise, return a tree expression with code CODE of
 10544    type TYPE with operands OP0, OP1, and OP2.  */
10545 
10546 tree
10547 fold_build3_stat (enum tree_code code, tree type, tree op0, tree op1, tree op2
10548              MEM_STAT_DECL)
10549 {
10550   tree tem;
10551 #ifdef ENABLE_FOLD_CHECKING
10552   unsigned char checksum_before_op0[16],
10553                 checksum_before_op1[16],
10554                 checksum_before_op2[16],
10555                 checksum_after_op0[16],
10556                 checksum_after_op1[16],
10557                 checksum_after_op2[16];
10558   struct md5_ctx ctx;
10559   htab_t ht;
10560 
10561   ht = htab_create (32, htab_hash_pointer, htab_eq_pointer, NULL);
10562   md5_init_ctx (&ctx);
10563   fold_checksum_tree (op0, &ctx, ht);
10564   md5_finish_ctx (&ctx, checksum_before_op0);
10565   htab_empty (ht);
10566 
10567   md5_init_ctx (&ctx);
10568   fold_checksum_tree (op1, &ctx, ht);
10569   md5_finish_ctx (&ctx, checksum_before_op1);
10570   htab_empty (ht);
10571 
10572   md5_init_ctx (&ctx);
10573   fold_checksum_tree (op2, &ctx, ht);
10574   md5_finish_ctx (&ctx, checksum_before_op2);
10575   htab_empty (ht);
10576 #endif
10577   
10578   tem = fold_ternary (code, type, op0, op1, op2);
10579   if (!tem)
10580     tem =  build3_stat (code, type, op0, op1, op2 PASS_MEM_STAT);
10581       
10582 #ifdef ENABLE_FOLD_CHECKING
10583   md5_init_ctx (&ctx);
10584   fold_checksum_tree (op0, &ctx, ht);
10585   md5_finish_ctx (&ctx, checksum_after_op0);
10586   htab_empty (ht);
10587 
10588   if (memcmp (checksum_before_op0, checksum_after_op0, 16))
10589     fold_check_failed (op0, tem);
10590   
10591   md5_init_ctx (&ctx);
10592   fold_checksum_tree (op1, &ctx, ht);
10593   md5_finish_ctx (&ctx, checksum_after_op1);
10594   htab_empty (ht);
10595 
10596   if (memcmp (checksum_before_op1, checksum_after_op1, 16))
10597     fold_check_failed (op1, tem);
10598   
10599   md5_init_ctx (&ctx);
10600   fold_checksum_tree (op2, &ctx, ht);
10601   md5_finish_ctx (&ctx, checksum_after_op2);
10602   htab_delete (ht);
10603 
10604   if (memcmp (checksum_before_op2, checksum_after_op2, 16))
10605     fold_check_failed (op2, tem);
10606 #endif
10607   return tem;
10608 }


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