[tarantool-patches] Re: [PATCH v3 05/10] sql: refactor sql_expr_compile to return AST
Vladislav Shpilevoy
v.shpilevoy at tarantool.org
Thu Jun 14 22:27:14 MSK 2018
Thanks for the fixes! See 2 comments below.
Besides, I have pushed other review fixes as a separate commit. Please,
look and squash.
On 14/06/2018 20:32, Kirill Shcherbatov wrote:
> ---
> src/box/alter.cc | 6 +++---
> src/box/sql.c | 5 +++--
> src/box/sql.h | 9 ++++-----
> src/box/sql/tokenize.c | 32 +++++++++++++++++++-------------
> 4 files changed, 29 insertions(+), 23 deletions(-)
>
> diff --git a/src/box/sql/tokenize.c b/src/box/sql/tokenize.c
> index 42c70a2..d84a840 100644
> --- a/src/box/sql/tokenize.c
> +++ b/src/box/sql/tokenize.c
> @@ -550,19 +555,20 @@ sql_expr_compile(sqlite3 *db, const char *expr, int expr_len,
> sql_parser_create(&parser, db);
> parser.parse_only = true;
>
> + struct Expr *expression = NULL;
> char *stmt = (char *)region_alloc(&parser.region, len + 1);
> if (stmt == NULL) {
> diag_set(OutOfMemory, len + 1, "region_alloc", "stmt");
> - return -1;
> + return NULL;
1. Here parser.region leaks.
> }
> sprintf(stmt, "%s%.*s", outer, expr_len, expr);
>
> - char *unused;
> - if (sqlite3RunParser(&parser, stmt, &unused) != SQLITE_OK) {
> - diag_set(ClientError, ER_SQL_EXECUTE, expr);
> - return -1;
> - }
> - *result = parser.parsed_expr;
> + char *sql_error;
> + if (sqlite3RunParser(&parser, stmt, &sql_error) != SQLITE_OK &&
> + parser.rc != SQL_TARANTOOL_ERROR)
> + diag_set(ClientError, ER_SQL, sql_error);
> + else
> + expression = parser.parsed_expr;
2. If a TARANTOOL_ERROR has occurred and parsed_expr had been set before it,
then you return not NULL, but should return NULL.
And you should destroy the expression. Looks like it was a leak before your
patch. Lets always delete all the parsed expressions in parser_destroy (here
only parsed_expr is). And in this function on success nullify this member
before destroy.
> sql_parser_destroy(&parser);
> - return 0;
> + return expression;
> }
>
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