rename POPFOO() to CX_POPFOO()

Rename all the context-popping macros such as POPBLOCK and POPSUB, by
giving them a CX_ prefix. (Do TOPBLOCK too).

This is principally to  deliberately break any existing non-core use of
these non-API macros, as their behaviour has changed in this branch.
In particular, POPBLOCK(cx) no longer decrements the cxt stack pointer
nor sets cx; instead, cx is now expected to already point to the stack
frame which POPBLOCK should process.

At the same time, giving them a CX_ prefix makes it clearer that these
are all part of a family of macros that manipulate the context stack.

The PUSHFOO() macros will be renamed in a later commit.

1 files changed, 2 insertions, 2 deletions

diff --git a/pp_sys.c b/pp_sys.c
index ff56179b60..ea99011594 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -1527,8 +1527,8 @@ PP(pp_leavewrite)
     assert(CxTYPE(cx) == CXt_FORMAT);
     SP = PL_stack_base + cx->blk_oldsp; /* ignore retval of formline */
     CX_LEAVE_SCOPE(cx);
-    POPFORMAT(cx);
-    POPBLOCK(cx);
+    CX_POPFORMAT(cx);
+    CX_POPBLOCK(cx);
     retop = cx->blk_sub.retop;
     CX_POP(cx);