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, 24 insertions, 0 deletions

diff --git a/erts/emulator/beam/big.c b/erts/emulator/beam/big.c
index 03c88da8c6..b8464ded28 100644
--- a/erts/emulator/beam/big.c
+++ b/erts/emulator/beam/big.c
@@ -1459,7 +1459,31 @@ Eterm uint_to_big(Uint x, Eterm *y)
     BIG_DIGIT(y, 0) = x;
     return make_big(y);
 }
+/*
+** convert UWord to bigint
+** (must only be used if x is to big to be stored as a small)
+** Allocation is tricky, the heap need has to be calculated
+** with the macro BIG_UWORD_HEAP_SIZE(x)
+*/
 
+Eterm uword_to_big(UWord x, Eterm *y)
+{
+#if HALFWORD_HEAP
+    Uint upper = x >> 32;
+    Uint lower = x & 0xFFFFFFFFUL;
+    if (upper == 0) {
+	*y = make_pos_bignum_header(1);
+    } else {
+	*y = make_pos_bignum_header(2);
+	BIG_DIGIT(y, 1) = upper;
+    }
+    BIG_DIGIT(y, 0) = lower;
+#else
+    *y = make_pos_bignum_header(1);
+    BIG_DIGIT(y, 0) = x;
+#endif
+    return make_big(y);
+}
 
 /*
 ** convert signed int to bigint