Fit all heap data into the 32-bit address range

This is the first step in the implementation of the half-word emulator,
a 64-bit emulator where all pointers to heap data will be stored
in 32-bit words. Code specific for this emulator variant is
conditionally compiled when the HALFWORD_HEAP define has
a non-zero value.

First force all pointers to heap data to fall into a single 32-bit range,
but still store them in 64-bit words.

Temporary term data stored on C stack is moved into scheduler specific
storage (allocated as heaps) and macros are added to make this
happen only in emulators where this is needed. For a vanilla VM the
temporary terms are still stored on the C stack.

1 files changed, 2 insertions, 0 deletions

diff --git a/erts/emulator/beam/erl_lock_check.c b/erts/emulator/beam/erl_lock_check.c
index 074b08ea57..4858be1b75 100644
--- a/erts/emulator/beam/erl_lock_check.c
+++ b/erts/emulator/beam/erl_lock_check.c
@@ -1231,6 +1231,8 @@ void
 erts_lc_init_lock(erts_lc_lock_t *lck, char *name, Uint16 flags)
 {
     lck->id = erts_lc_get_lock_order_id(name);
+
+    /* XXX:PaN What to do with the extra information? */
     lck->extra = make_boxed(&lck->extra);
     lck->flags = flags;
     lck->inited = ERTS_LC_INITITALIZED;