Store pointers to heap data in 32-bit words

Store Erlang terms in 32-bit entities on the heap, expanding the
pointers to 64-bit when needed. This works because all terms are stored
on addresses in the 32-bit address range (the 32 most significant bits
of pointers to term data are always 0).

Introduce a new datatype called UWord (along with its companion SWord),
which is an integer having the exact same size as the machine word
(a void *), but might be larger than Eterm/Uint.

Store code as machine words, as the instructions are pointers to
executable code which might reside outside the 32-bit address range.

Continuation pointers are stored on the 32-bit stack and hence must
point to addresses in the low range, which means that loaded beam code
much be placed in the low 32-bit address range (but, as said earlier,
the instructions themselves are full words).

No Erlang term data can be stored on C stacks (enforced by an
earlier commit).

This version gives a prompt, but test cases still fail (and dump core).

The loader (and emulator loop) has instruction packing disabled.

The main issues has been in rewriting loader and actual virtual
machine. Subsystems (like distribution) does not work yet.

1 files changed, 4 insertions, 4 deletions

diff --git a/erts/emulator/beam/erl_fun.h b/erts/emulator/beam/erl_fun.h
index fb5e75649b..980cdd414a 100644
--- a/erts/emulator/beam/erl_fun.h
+++ b/erts/emulator/beam/erl_fun.h
@@ -33,10 +33,10 @@ typedef struct erl_fun_entry {
     int index;			/* New style index. */
     int old_uniq;		/* Unique number (old_style) */
     int old_index;		/* Old style index */
-    Eterm* address;		/* Pointer to code for fun */
+    UWord* address;		/* Pointer to code for fun */
 
 #ifdef HIPE
-    Eterm* native_address;	/* Native entry code for fun. */
+    UWord* native_address;	/* Native entry code for fun. */
 #endif
 
     Uint arity;			/* The arity of the fun. */
@@ -58,7 +58,7 @@ typedef struct erl_fun_thing {
 #endif
     ErlFunEntry* fe;		/* Pointer to fun entry. */
 #ifdef HIPE
-    Eterm* native_address;	/* Native code for the fun. */
+    UWord* native_address;	/* Native code for the fun. */
 #endif
     Uint arity;			/* The arity of the fun. */
     Uint num_free;		/* Number of free variables (in env). */
@@ -86,7 +86,7 @@ void erts_erase_fun_entry(ErlFunEntry* fe);
 #ifndef HYBRID /* FIND ME! */
 void erts_cleanup_funs(ErlFunThing* funp);
 #endif
-void erts_cleanup_funs_on_purge(Eterm* start, Eterm* end);
+void erts_cleanup_funs_on_purge(UWord* start, UWord* end);
 void erts_dump_fun_entries(int, void *);
 
 #endif