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, 7 insertions, 1 deletions

diff --git a/erts/emulator/beam/erl_debug.h b/erts/emulator/beam/erl_debug.h
index 74f4a00b63..b69f2c52cd 100644
--- a/erts/emulator/beam/erl_debug.h
+++ b/erts/emulator/beam/erl_debug.h
@@ -18,9 +18,10 @@
  */
 #ifndef _ERL_DEBUG_H_
 #define _ERL_DEBUG_H_
-
 #ifdef DEBUG
 
+#include "erl_term.h"
+
 #ifdef HIPE
 #include "hipe_debug.h"
 #endif
@@ -92,6 +93,11 @@ extern void print_tagged_memory(Eterm *start, Eterm *end);
 extern void print_untagged_memory(Eterm *start, Eterm *end);
 extern void print_memory(Process *p);
 extern void print_memory_info(Process *p);
+#if defined(DEBUG) && !HEAP_ON_C_STACK
+extern Eterm *erts_debug_allocate_tmp_heap(int, Process *);
+extern void erts_debug_use_tmp_heap(int, Process *);
+extern void erts_debug_unuse_tmp_heap(int, Process *);
+#endif
 
 #ifdef HYBRID
 extern void print_ma_info(void);