Tail call VM

Author: arnaud-lb

Zend/zend_compile.h

@@ -24,6 +24,7 @@
 #include "zend_types.h"
 #include "zend_map_ptr.h"
 #include "zend_alloc.h"
+#include "zend_vm_opcodes.h"
 
 #include <stdarg.h>
 #include <stdint.h>
@@ -135,7 +136,7 @@ void zend_const_expr_to_zval(zval *result, zend_ast **ast_ptr, bool allow_dynami
 typedef int (*user_opcode_handler_t) (zend_execute_data *execute_data);
 
 struct _zend_op {
-	const void *handler;
+	zend_vm_opcode_handler_t handler;
 	znode_op op1;
 	znode_op op2;
 	znode_op result;

Zend/zend_portability.h

@@ -318,6 +318,24 @@ char *alloca();
 # define ZEND_FASTCALL
 #endif
 
+/* Compilers may report to have preserve_none, while supporting it only on some architectures */
+#if __has_attribute(preserve_none) && (defined(__x86_64__) || defined(__aarch64__))
+# define HAVE_PRESERVE_NONE
+# define ZEND_PRESERVE_NONE __attribute__((preserve_none))
+#else
+# define ZEND_PRESERVE_NONE
+#endif
+
+#if __has_attribute(musttail)
+#  define HAVE_MUSTTAIL
+#  define ZEND_MUSTTAIL __attribute__((musttail))
+#endif
+
+#if __has_attribute(sysv_abi)
+#  define HAVE_SYSV_ABI
+#  define ZEND_SYSV_ABI __attribute__((sysv_abi))
+#endif
+
 #if (defined(__GNUC__) && __GNUC__ >= 3 && !defined(__INTEL_COMPILER) && !defined(__APPLE__) && !defined(__hpux) && !defined(_AIX) && !defined(__osf__)) || __has_attribute(noreturn)
 # define HAVE_NORETURN
 # define ZEND_NORETURN __attribute__((noreturn))

Zend/zend_vm_def.h

@@ -4917,7 +4917,7 @@ ZEND_VM_HOT_SEND_HANDLER(116, ZEND_SEND_VAL_EX, CONST|TMP, CONST|UNUSED|NUM, SPE
 			ZEND_VM_C_GOTO(send_val_by_ref);
 		}
 	} else if (ARG_MUST_BE_SENT_BY_REF(EX(call)->func, arg_num)) {
-ZEND_VM_C_LABEL(send_val_by_ref):
+ZEND_VM_C_LABEL(send_val_by_ref):;
 		ZEND_VM_DISPATCH_TO_HELPER(zend_cannot_pass_by_ref_helper, _arg_num, arg_num, _arg, arg);
 	}
 	value = GET_OP1_ZVAL_PTR(BP_VAR_R);
@@ -8231,9 +8231,9 @@ ZEND_VM_HANDLER(150, ZEND_USER_OPCODE, ANY, ANY)
 		case ZEND_USER_OPCODE_LEAVE:
 			ZEND_VM_LEAVE();
 		case ZEND_USER_OPCODE_DISPATCH:
-			ZEND_VM_DISPATCH(opline->opcode, opline);
+			ZEND_VM_DISPATCH_OPCODE(opline->opcode, opline);
 		default:
-			ZEND_VM_DISPATCH((uint8_t)(ret & 0xff), opline);
+			ZEND_VM_DISPATCH_OPCODE((uint8_t)(ret & 0xff), opline);
 	}
 }