coroutines: Ensure distinct DTOR trees [PR95137].
Part of the PR notes that there are UBSAN fails for the coroutines test suite. These are primarily related to the use of the same DTOR tree in the two edges from the await block. Fixed by building a new tree for each. gcc/cp/ChangeLog: PR c++/95137 * coroutines.cc (expand_one_await_expression): Build separate DTOR trees for the awaitable object on the destroy and resume paths.
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@ -1488,19 +1488,13 @@ expand_one_await_expression (tree *stmt, tree *await_expr, void *d)
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tree resume_label = create_named_label_with_ctx (loc, buf, actor);
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tree empty_list = build_empty_stmt (loc);
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tree dtor = NULL_TREE;
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tree await_type = TREE_TYPE (var);
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if (needs_dtor)
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dtor = build_special_member_call (var, complete_dtor_identifier, NULL,
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await_type, LOOKUP_NORMAL,
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tf_warning_or_error);
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tree stmt_list = NULL;
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tree t_expr = STRIP_NOPS (expr);
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tree r;
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tree *await_init = NULL;
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if (t_expr == var)
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dtor = NULL_TREE;
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needs_dtor = false;
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else
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{
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/* Initialize the var from the provided 'o' expression. */
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@ -1615,7 +1609,12 @@ expand_one_await_expression (tree *stmt, tree *await_expr, void *d)
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destroy_label = build_stmt (loc, LABEL_EXPR, destroy_label);
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append_to_statement_list (destroy_label, &body_list);
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if (needs_dtor)
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append_to_statement_list (dtor, &body_list);
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{
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tree dtor = build_special_member_call (var, complete_dtor_identifier,
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NULL, await_type, LOOKUP_NORMAL,
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tf_warning_or_error);
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append_to_statement_list (dtor, &body_list);
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}
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r = build1_loc (loc, GOTO_EXPR, void_type_node, data->cleanup);
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append_to_statement_list (r, &body_list);
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@ -1650,7 +1649,12 @@ expand_one_await_expression (tree *stmt, tree *await_expr, void *d)
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/* Get a pointer to the revised statment. */
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tree *revised = tsi_stmt_ptr (tsi_last (stmt_list));
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if (needs_dtor)
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append_to_statement_list (dtor, &stmt_list);
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{
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tree dtor = build_special_member_call (var, complete_dtor_identifier,
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NULL, await_type, LOOKUP_NORMAL,
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tf_warning_or_error);
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append_to_statement_list (dtor, &stmt_list);
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}
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data->index += 2;
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/* Replace the original statement with the expansion. */
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