bpo-33041: Fix downcast warning on Windows (#6595)

vstinner · web-flow · commit 078c4e3519de · 2018-04-27T14:30:01.000+02:00
Cast pointer difference from ssize_t to int: a frame is very unlikely
larger than 2 GB.
diff --git a/Objects/frameobject.c b/Objects/frameobject.c
@@ -297,7 +297,7 @@ frame_setlineno(PyFrameObject *f, PyObject* p_new_lineno)
     if (delta_iblock > 0) {
         f->f_iblock -= delta_iblock;
         PyTryBlock *b = &f->f_blockstack[f->f_iblock];
-        delta += (f->f_stacktop - f->f_valuestack) - b->b_level;
+        delta += (int)(f->f_stacktop - f->f_valuestack) - b->b_level;
         if (b->b_type == SETUP_FINALLY &&
             code[b->b_handler] == WITH_CLEANUP_START)
         {

Original file line number	Diff line number	Diff line change
`@@ -297,7 +297,7 @@ frame_setlineno(PyFrameObject f, PyObject p_new_lineno)`
`297`	`297`	`if (delta_iblock > 0) {`
`298`	`298`	`f->f_iblock -= delta_iblock;`
`299`	`299`	`PyTryBlock *b = &f->f_blockstack[f->f_iblock];`
`300`		`- delta += (f->f_stacktop - f->f_valuestack) - b->b_level;`
	`300`	`+ delta += (int)(f->f_stacktop - f->f_valuestack) - b->b_level;`
`301`	`301`	`if (b->b_type == SETUP_FINALLY &&`
`302`	`302`	`code[b->b_handler] == WITH_CLEANUP_START)`
`303`	`303`	`{`