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, 3 insertions, 3 deletions

diff --git a/erts/emulator/beam/error.h b/erts/emulator/beam/error.h
index 4930def4ed..8f95140864 100644
--- a/erts/emulator/beam/error.h
+++ b/erts/emulator/beam/error.h
@@ -187,10 +187,10 @@ extern Eterm exception_tag[NUMBER_EXC_TAGS];
 struct StackTrace {
     Eterm header;	/* bignum header - must be first in struct */
     Eterm freason; /* original exception reason is saved in the struct */
-    Eterm* pc;
-    Eterm* current;
+    UWord* pc;
+    UWord* current;
     int depth;	/* number of saved pointers in trace[] */
-    Eterm *trace[1];  /* varying size - must be last in struct */
+    UWord *trace[1];  /* varying size - must be last in struct */
 };
 
 #endif /* __ERROR_H__ */