all: Rename BYTES_PER_WORD to MP_BYTES_PER_OBJ_WORD.

The "word" referred to by BYTES_PER_WORD is actually the size of mp_obj_t
which is not always the same as the size of a pointer on the target
architecture.  So rename this config value to better reflect what it
measures, and also prefix it with MP_.

For uses of BYTES_PER_WORD in setting the stack limit this has been
changed to sizeof(void *), because the stack usually grows with
machine-word sized values (eg an nlr_buf_t has many machine words in it).

Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mpy-cross/main.c b/mpy-cross/main.c
index a403c0504d..635e53a719 100644
--- a/mpy-cross/main.c
+++ b/mpy-cross/main.c
@@ -170,7 +170,7 @@ STATIC void pre_process_options(int argc, char **argv) {
                         heap_size *= 1024 * 1024;
                     }
                     if (word_adjust) {
-                        heap_size = heap_size * BYTES_PER_WORD / 4;
+                        heap_size = heap_size * MP_BYTES_PER_OBJ_WORD / 4;
                     }
                 } else {
                     exit(usage(argv));
@@ -182,7 +182,7 @@ STATIC void pre_process_options(int argc, char **argv) {
 }
 
 MP_NOINLINE int main_(int argc, char **argv) {
-    mp_stack_set_limit(40000 * (BYTES_PER_WORD / 4));
+    mp_stack_set_limit(40000 * (sizeof(void *) / 4));
 
     pre_process_options(argc, argv);