extmod/modure: Convert alloca() to use new scoped allocation API.

dpgeorge · dpgeorge · commit ab750ee2fb63 · 2017-12-11T13:49:09.000+11:00
diff --git a/extmod/modure.c b/extmod/modure.c
@@ -144,7 +144,7 @@ STATIC mp_obj_t re_split(size_t n_args, const mp_obj_t *args) {
     }
 
     mp_obj_t retval = mp_obj_new_list(0, NULL);
-    const char **caps = alloca(caps_num * sizeof(char*));
+    const char **caps = mp_local_alloc(caps_num * sizeof(char*));
     while (true) {
         // cast is a workaround for a bug in msvc: it treats const char** as a const pointer instead of a pointer to pointer to const char
         memset((char**)caps, 0, caps_num * sizeof(char*));
@@ -165,6 +165,7 @@ STATIC mp_obj_t re_split(size_t n_args, const mp_obj_t *args) {
             break;
         }
     }
+    mp_local_free(caps);
 
     mp_obj_t s = mp_obj_new_str_of_type(str_type, (const byte*)subj.begin, subj.end - subj.begin);
     mp_obj_list_append(retval, s);

Original file line number	Diff line number	Diff line change
`@@ -144,7 +144,7 @@ STATIC mp_obj_t re_split(size_t n_args, const mp_obj_t *args) {`
`144`	`144`	`}`
`145`	`145`
`146`	`146`	`mp_obj_t retval = mp_obj_new_list(0, NULL);`
`147`		`- const char *caps = alloca(caps_num sizeof(char*));`
	`147`	`+ const char *caps = mp_local_alloc(caps_num sizeof(char*));`
`148`	`148`	`while (true) {`
`149`	`149`	`// cast is a workaround for a bug in msvc: it treats const char** as a const pointer instead of a pointer to pointer to const char`
`150`	`150`	`memset((char*)caps, 0, caps_num sizeof(char*));`
`@@ -165,6 +165,7 @@ STATIC mp_obj_t re_split(size_t n_args, const mp_obj_t *args) {`
`165`	`165`	`break;`
`166`	`166`	`}`
`167`	`167`	`}`
	`168`	`+ mp_local_free(caps);`
`168`	`169`
`169`	`170`	`mp_obj_t s = mp_obj_new_str_of_type(str_type, (const byte*)subj.begin, subj.end - subj.begin);`
`170`	`171`	`mp_obj_list_append(retval, s);`