Malloc branch entries (#112)

* Malloc branch entries

* Add ASM comment for stack overflow check

* WIP

* Fix branch GC code. Add rb_darray_remove_unordered().

* Fix block end_pos after branch rewriting. Remove dst_patched bits.

1 files changed, 10 insertions, 0 deletions

diff --git a/darray.h b/darray.h
index 71e2d7e6ce..b613d08489 100644
--- a/darray.h
+++ b/darray.h
@@ -51,10 +51,20 @@
         1                                         \
     ) : 0)
 
+// Last element of the array
+//
+#define rb_darray_back(ary) ((ary)->data[(ary)->meta.size - 1])
+
 // Remove the last element of the array.
 //
 #define rb_darray_pop_back(ary) ((ary)->meta.size--)
 
+// Remove element at idx and replace it by the last element
+#define rb_darray_remove_unordered(ary, idx) do {   \
+    rb_darray_set(ary, idx, rb_darray_back(ary));   \
+    rb_darray_pop_back(ary);                        \
+} while (0);
+
 // Iterate over items of the array in a for loop
 //
 #define rb_darray_foreach(ary, idx_name, elem_ptr_var) \