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, 13 insertions, 1 deletions

diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index a34d400ed8..8d3618393a 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -59,6 +59,12 @@
 /* Keep erts_system_version as a global variable for easy access from a core */
 static char erts_system_version[] = ("Erlang " ERLANG_OTP_RELEASE
 				     " (erts-" ERLANG_VERSION ")"
+#if HALFWORD_HEAP
+				     " [halfword]"
+#endif
+#if !HEAP_ON_C_STACK
+				     " [no-c-stack-objects]"
+#endif
 #ifndef OTP_RELEASE
 				     " [source]"
 #endif	
@@ -624,12 +630,18 @@ static Eterm pi_1_keys[] = {
 #define ERTS_PI_1_NO_OF_KEYS (sizeof(pi_1_keys)/sizeof(Eterm))
 
 static Eterm pi_1_keys_list;
-static Uint pi_1_keys_list_heap[2*ERTS_PI_1_NO_OF_KEYS];
+#if HEAP_ON_C_STACK
+static Eterm pi_1_keys_list_heap[2*ERTS_PI_1_NO_OF_KEYS];
+#endif
 
 static void
 process_info_init(void)
 {
+#if HEAP_ON_C_STACK
     Eterm *hp = &pi_1_keys_list_heap[0];
+#else
+    Eterm *hp = erts_alloc(ERTS_ALC_T_LL_TEMP_TERM,sizeof(Eterm)*2*ERTS_PI_1_NO_OF_KEYS);
+#endif
     int i;
 
     pi_1_keys_list = NIL;