erts: Refactor out func_info into struct

This commit adds two new structs to be used to represent
erlang code in erts.

ErtsCodeInfo is used to describe the i_func_info header
that is part of all Export entries and the prelude of
each function. This replaces all the BeamInstr * that
were previously used to point to these locations.
After this change the code should never use BeamInstr *
with offsets to figure out different parts of the
func_info header.

ErtsCodeMFA is a struct that is used to descripe a
MFA in code. It is used within ErtsCodeInfo and also
in Process->current.

All function that previously took Eterm * or BeamInstr *
to identify a MFA now use the ErtsCodeMFA or ErtsCodeInfo
where appropriate.

The code has been tested to work when adding a new field to the
ErtsCodeInfo struct, but some updates are needed in ops.tab to
make it work.

1 files changed, 6 insertions, 6 deletions

diff --git a/erts/emulator/beam/bif.c b/erts/emulator/beam/bif.c
index 84eab5f651..324f7d4268 100644
--- a/erts/emulator/beam/bif.c
+++ b/erts/emulator/beam/bif.c
@@ -4963,13 +4963,13 @@ void erts_init_trap_export(Export* ep, Eterm m, Eterm f, Uint a,
     int i;
     sys_memset((void *) ep, 0, sizeof(Export));
     for (i=0; i<ERTS_NUM_CODE_IX; i++) {
-	ep->addressv[i] = &ep->code[3];
+	ep->addressv[i] = ep->code;
     }
-    ep->code[0] = m;
-    ep->code[1] = f;
-    ep->code[2] = a;
-    ep->code[3] = (BeamInstr) em_apply_bif;
-    ep->code[4] = (BeamInstr) bif;
+    ep->info.mfa.module = m;
+    ep->info.mfa.function = f;
+    ep->info.mfa.arity = a;
+    ep->code[0] = (BeamInstr) em_apply_bif;
+    ep->code[1] = (BeamInstr) bif;
 }
 
 void erts_init_bif(void)