Remove unused zend_interrupt CALL variant; simplify delayed helpers macro

The CALL variant of zend_interrupt was never called: delayed helpers only
exist in TAILCALL builds ($delayed_helpers is only populated when
$kind === ZEND_VM_KIND_TAILCALL), so the #elif/#else branches in the
ZEND_VM_INTERRUPT macro were dead code, and zend_interrupt itself was
compiled but unreferenced — triggering an unused-function warning on
macOS ARM64 DEBUG NTS.

Remove the CALL case from gen_interrupt_func, drop its forward declaration
from the CALL section preamble, and replace the three-way C-level #if in
the delayed helpers ZEND_VM_INTERRUPT macro with a single unconditional
line (the TAILCALL sentinel path), since that block is only ever emitted
for TAILCALL builds.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: morrisonlevi

Zend/zend_vm_execute.h

@@ -1595,23 +1595,10 @@ function gen_halt_handler($f, $kind) {
 }
 
 function gen_interrupt_func($f, $kind, $spec) {
-    $cconv = $kind === ZEND_VM_KIND_TAILCALL ? 'ZEND_OPCODE_HANDLER_CCONV' : 'ZEND_OPCODE_HANDLER_FUNC_CCONV';
-    $variant = $kind === ZEND_VM_KIND_TAILCALL ? '_TAILCALL' : '';
-    if ($kind !== ZEND_VM_KIND_TAILCALL) {
-        /* Guard: exclude global-reg builds (void return) and TAILCALL builds (have own variant) */
-        out($f, "#if !(defined(ZEND_VM_FP_GLOBAL_REG) && defined(ZEND_VM_IP_GLOBAL_REG)) && ZEND_VM_KIND != ZEND_VM_KIND_TAILCALL\n");
-    }
-    out($f, "static ZEND_COLD zend_never_inline ZEND_OPCODE_HANDLER_RET {$cconv} zend_interrupt{$variant}(ZEND_OPCODE_HANDLER_ARGS) {\n");
+    out($f, "static ZEND_COLD zend_never_inline ZEND_OPCODE_HANDLER_RET ZEND_OPCODE_HANDLER_CCONV zend_interrupt_TAILCALL(ZEND_OPCODE_HANDLER_ARGS) {\n");
     out($f,"\tSAVE_OPLINE();\n");
-    if ($kind === ZEND_VM_KIND_TAILCALL) {
-        out($f,"\tZEND_VM_TAIL_CALL(zend_interrupt_helper".($spec?"_SPEC":"")."_TAILCALL(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU));\n");
-    } else {
-        out($f, "\treturn zend_interrupt_helper".($spec?"_SPEC":"")."(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU);\n");
-    }
+    out($f,"\tZEND_VM_TAIL_CALL(zend_interrupt_helper".($spec?"_SPEC":"")."_TAILCALL(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU));\n");
     out($f, "}\n");
-    if ($kind !== ZEND_VM_KIND_TAILCALL) {
-        out($f, "#endif\n");
-    }
 }
 
 function extra_spec_name($extra_spec) {
@@ -1824,7 +1811,6 @@ function gen_executor_code($f, $spec, $kind, $prolog, &$switch_labels = array())
     switch ($kind) {
         case ZEND_VM_KIND_CALL:
             gen_null_handler($f, $kind);
-            gen_interrupt_func($f, $kind, $spec);
             break;
         case ZEND_VM_KIND_TAILCALL:
             gen_null_handler($f, $kind);
@@ -1867,13 +1853,7 @@ function gen_executor_code($f, $spec, $kind, $prolog, &$switch_labels = array())
         out($f, "#pragma push_macro(\"ZEND_VM_INTERRUPT\")\n");
         out($f, "#undef  ZEND_VM_INTERRUPT\n");
         out($f, "#define ZEND_VM_CONTINUE(handler) return opline\n");
-        out($f, "#if ZEND_VM_KIND == ZEND_VM_KIND_TAILCALL\n");
         out($f, "# define ZEND_VM_INTERRUPT()      SAVE_OPLINE(); return &call_interrupt_op;\n");
-        out($f, "#elif defined(ZEND_VM_FP_GLOBAL_REG) && defined(ZEND_VM_IP_GLOBAL_REG)\n");
-        out($f, "# define ZEND_VM_INTERRUPT()      return zend_interrupt_helper".($spec?"_SPEC":"")."(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU);\n");
-        out($f, "#else\n");
-        out($f, "# define ZEND_VM_INTERRUPT()      return zend_interrupt(ZEND_OPCODE_HANDLER_ARGS_PASSTHRU);\n");
-        out($f, "#endif\n");
         out($f, $delayed_helpers);
         out($f, "#pragma pop_macro(\"ZEND_VM_INTERRUPT\")\n");
         out($f, "#pragma pop_macro(\"ZEND_VM_CONTINUE\")\n");
@@ -2069,9 +2049,6 @@ function gen_executor($f, $skl, $spec, $kind, $executor_name, $initializer_name)
                             }
                             out($f,"\n");
                             out($f,"static ZEND_OPCODE_HANDLER_RET ZEND_OPCODE_HANDLER_FUNC_CCONV zend_interrupt_helper".($spec?"_SPEC":"")."(ZEND_OPCODE_HANDLER_ARGS);\n");
-                            out($f,"#if !(defined(ZEND_VM_FP_GLOBAL_REG) && defined(ZEND_VM_IP_GLOBAL_REG)) && ZEND_VM_KIND != ZEND_VM_KIND_TAILCALL\n");
-                            out($f,"static ZEND_OPCODE_HANDLER_RET ZEND_OPCODE_HANDLER_FUNC_CCONV zend_interrupt(ZEND_OPCODE_HANDLER_ARGS);\n");
-                            out($f,"#endif\n");
                             out($f,"static ZEND_OPCODE_HANDLER_RET ZEND_OPCODE_HANDLER_FUNC_CCONV ZEND_NULL_HANDLER(ZEND_OPCODE_HANDLER_ARGS);\n");
                             out($f,"\n");
                             break;