From: Vincent Pit <vince@profvince.com>
Date: Thu, 13 Sep 2012 23:44:06 +0000 (+0200)
Subject: Move PL_stack_sp/items adjustments from su_unwind/su_yield to XSubs
X-Git-Tag: v0.20~7
X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2FScope-Upper.git;a=commitdiff_plain;h=aa287c017fc604bccef210250c7235b4e2e5a849

Move PL_stack_sp/items adjustments from su_unwind/su_yield to XSubs
---

diff --git a/Upper.xs b/Upper.xs
index b1d9a08..0d51f43 100644
--- a/Upper.xs
+++ b/Upper.xs
@@ -1071,23 +1071,17 @@ STATIC I32 su_init(pTHX_ void *ud, I32 cxix, I32 size) {
 
 STATIC void su_unwind(pTHX_ void *ud_) {
  dMY_CXT;
- I32 cxix    = MY_CXT.unwind_storage.cxix;
- I32 items   = MY_CXT.unwind_storage.items - 1;
- SV **savesp = MY_CXT.unwind_storage.savesp;
+ I32 cxix  = MY_CXT.unwind_storage.cxix;
+ I32 items = MY_CXT.unwind_storage.items;
  I32 mark;
 
  PERL_UNUSED_VAR(ud_);
 
- if (savesp)
-  PL_stack_sp = savesp;
+ PL_stack_sp = MY_CXT.unwind_storage.savesp;
 
  if (cxstack_ix > cxix)
   dounwind(cxix);
 
- /* Hide the level */
- if (items >= 0)
-  PL_stack_sp--;
-
  mark = PL_markstack[cxstack[cxix].blk_oldmarksp];
  *PL_markstack_ptr = PL_stack_sp - PL_stack_base - items;
 
@@ -1126,17 +1120,13 @@ STATIC void su_yield(pTHX_ void *ud_) {
  dMY_CXT;
  PERL_CONTEXT *cx;
  I32 cxix      = MY_CXT.yield_storage.cxix;
- I32 items     = MY_CXT.yield_storage.items - 1;
- SV **savesp   = MY_CXT.yield_storage.savesp;
+ I32 items     = MY_CXT.yield_storage.items;
  opcode  type  = OP_NULL;
  U8      flags = 0;
  OP     *next;
 
  PERL_UNUSED_VAR(ud_);
 
- if (savesp)
-  PL_stack_sp = savesp;
-
  cx = cxstack + cxix;
  switch (CxTYPE(cx)) {
   case CXt_BLOCK: {
@@ -1260,15 +1250,11 @@ cxt_when:
    break;
  }
 
+ PL_stack_sp = MY_CXT.yield_storage.savesp;
+
  if (cxstack_ix > cxix)
   dounwind(cxix);
 
- /* Hide the level */
- if (items >= 0)
-  PL_stack_sp--;
- else
-  items = 0;
-
  /* Copy the arguments passed to yield() where the leave op expects to find
   * them. */
  if (items)
@@ -2203,17 +2189,18 @@ XS(XS_Scope__Upper_unwind) {
      continue;
    case CXt_EVAL:
    case CXt_FORMAT:
-    MY_CXT.unwind_storage.cxix  = cxix;
-    MY_CXT.unwind_storage.items = items;
+    MY_CXT.unwind_storage.cxix   = cxix;
+    MY_CXT.unwind_storage.items  = items;
+    MY_CXT.unwind_storage.savesp = PL_stack_sp;
+    if (items > 0) {
+     MY_CXT.unwind_storage.items--;
+     MY_CXT.unwind_storage.savesp--;
+    }
     /* pp_entersub will want to sanitize the stack after returning from there
-     * Screw that, we're insane */
-    if (GIMME_V == G_SCALAR) {
-     MY_CXT.unwind_storage.savesp = PL_stack_sp;
-     /* dXSARGS calls POPMARK, so we need to match PL_markstack_ptr[1] */
+     * Screw that, we're insane!
+     * dXSARGS calls POPMARK, so we need to match PL_markstack_ptr[1] */
+    if (GIMME_V == G_SCALAR)
      PL_stack_sp = PL_stack_base + PL_markstack_ptr[1] + 1;
-    } else {
-     MY_CXT.unwind_storage.savesp = NULL;
-    }
     SAVEDESTRUCTOR_X(su_unwind, NULL);
     return;
    default:
@@ -2238,15 +2225,16 @@ XS(XS_Scope__Upper_yield) {
  PERL_UNUSED_VAR(ax); /* -Wall */
 
  SU_GET_CONTEXT(0, items - 1, su_context_here());
- MY_CXT.yield_storage.cxix  = cxix;
- MY_CXT.yield_storage.items = items;
+ MY_CXT.yield_storage.cxix   = cxix;
+ MY_CXT.yield_storage.items  = items;
+ MY_CXT.yield_storage.savesp = PL_stack_sp;
+ if (items > 0) {
+  MY_CXT.yield_storage.items--;
+  MY_CXT.yield_storage.savesp--;
+ }
  /* See XS_Scope__Upper_unwind */
- if (GIMME_V == G_SCALAR) {
-  MY_CXT.yield_storage.savesp = PL_stack_sp;
+ if (GIMME_V == G_SCALAR)
   PL_stack_sp = PL_stack_base + PL_markstack_ptr[1] + 1;
- } else {
-  MY_CXT.yield_storage.savesp = NULL;
- }
  SAVEDESTRUCTOR_X(su_yield, NULL);
  return;
 }