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, 4 insertions, 1 deletions

diff --git a/erts/emulator/beam/erl_db_util.c b/erts/emulator/beam/erl_db_util.c
index 8c373451fd..de12b9bdbf 100644
--- a/erts/emulator/beam/erl_db_util.c
+++ b/erts/emulator/beam/erl_db_util.c
@@ -2300,7 +2300,7 @@ void db_free_dmc_err_info(DMCErrInfo *ei){
 */
 Eterm db_add_counter(Eterm** hpp, Eterm counter, Eterm incr)
 {
-    Eterm big_tmp[2];
+    DeclareTmpHeapNoproc(big_tmp,2);
     Eterm res;
     Sint ires;
     Eterm arg1;
@@ -2318,6 +2318,7 @@ Eterm db_add_counter(Eterm** hpp, Eterm counter, Eterm incr)
 	}
     }
     else {
+	UseTmpHeapNoproc(2);
 	switch(NUMBER_CODE(counter, incr)) {
 	case SMALL_BIG:
 	    arg1 = small_to_big(signed_val(counter), big_tmp);
@@ -2332,12 +2333,14 @@ Eterm db_add_counter(Eterm** hpp, Eterm counter, Eterm incr)
 	    arg2 = counter;
 	    break;
 	default:
+	    UnUseTmpHeapNoproc(2);
 	    return THE_NON_VALUE;
 	}
 	res = big_plus(arg1, arg2, *hpp);
 	if (is_big(res)) {
 	    *hpp += BIG_NEED_SIZE(big_size(res));
 	}
+	UnUseTmpHeapNoproc(2);
 	return res;
     }
 }