erts: Improve hipe load/upgrade/purge machinery

A step toward better integration of hipe load and purge

Highlights:

* code_server no longer needs to call hipe_unified_loader:post_beam_load/1
  Instead new internal function hipe_redirect_to_module()
  is called by loading BIFs to patch native call sites if needed.

* hipe_purge_module() is called by erts_internal:purge_module/2
  to purge any native code.

* struct hipe_mfa_info redesigned and only used for exported
  functions that are called from or implemented by native code.
  A list of native call sites (struct hipe_ref) are kept for each hipe_mfa_info.

* struct hipe_sdesc used by hipe_find_mfa_from_ra()
  to build native stack traces.

1 files changed, 5 insertions, 9 deletions

diff --git a/erts/emulator/hipe/hipe_x86_gc.h b/erts/emulator/hipe/hipe_x86_gc.h
index 7802076f70..e92e6ea718 100644
--- a/erts/emulator/hipe/hipe_x86_gc.h
+++ b/erts/emulator/hipe/hipe_x86_gc.h
@@ -65,18 +65,14 @@ nstack_walk_init_sdesc(const Process *p, struct nstack_walk_state *state)
     state->sdesc0 = sdesc;
     return sdesc;
 #else
-    unsigned int nstkarity = p->hipe.narity - NR_ARG_REGS;
-    if ((int)nstkarity < 0)
-	nstkarity = 0;
     state->sdesc0[0].fsize = 0;
     state->sdesc0[0].has_exnra = 0;
-    state->sdesc0[0].arity = nstkarity;
+    state->sdesc0[0].stk_nargs = (p->hipe.narity < NR_ARG_REGS ? 0 :
+                                  p->hipe.narity - NR_ARG_REGS);
     state->sdesc0[0].livebits[0] = 0;
-# ifdef DEBUG
-    state->sdesc0[0].dbg_M = 0;
-    state->sdesc0[0].dbg_F = am_undefined;
-    state->sdesc0[0].dbg_A = 0;
-# endif
+    state->sdesc0[0].m_aix = 0;
+    state->sdesc0[0].f_aix = atom_val(am_undefined);
+    state->sdesc0[0].a     = 0;
     /* XXX: this appears to prevent a gcc-4.1.1 bug on x86 */
     __asm__ __volatile__("" : : "m"(*state) : "memory");
     return &state->sdesc0[0];