- The compiler can't detect all abstract function calls so we need to check.

# In this case throwing a dedicated exception is better than the error we
# show when the compiler can detect the abstract call because its run-time.

Zend/zend_default_classes.c

@@ -25,6 +25,7 @@
 #include "zend_builtin_functions.h"
 
 zend_class_entry *default_exception_ptr;
+zend_class_entry *abstract_exception_ptr;
 
 static zend_object_value zend_default_exception_new(zend_class_entry *class_type TSRMLS_DC)
 {
@@ -138,10 +139,10 @@ static zend_function_entry default_exception_functions[] = {
 
 static void zend_register_default_exception(TSRMLS_D)
 {
-	zend_class_entry default_exception;
+	zend_class_entry ce;
 
-	INIT_CLASS_ENTRY(default_exception, "exception", default_exception_functions);
-	default_exception_ptr = zend_register_internal_class(&default_exception TSRMLS_CC);
+	INIT_CLASS_ENTRY(ce, "exception", default_exception_functions);
+	default_exception_ptr = zend_register_internal_class(&ce TSRMLS_CC);
 	default_exception_ptr->create_object = zend_default_exception_new;
 
 	zend_declare_property_string(default_exception_ptr, "message", sizeof("message")-1, "Unknown exception", ZEND_ACC_PROTECTED);
@@ -149,6 +150,9 @@ static void zend_register_default_exception(TSRMLS_D)
 	zend_declare_property_null(default_exception_ptr, "file", sizeof("file")-1, ZEND_ACC_PROTECTED);
 	zend_declare_property_null(default_exception_ptr, "line", sizeof("line")-1, ZEND_ACC_PROTECTED);
 	zend_declare_property_null(default_exception_ptr, "trace", sizeof("trace")-1, ZEND_ACC_PROTECTED);
+
+	INIT_CLASS_ENTRY(ce, "abstract_exception", NULL);
+	abstract_exception_ptr = zend_register_internal_class_ex(&ce, default_exception_ptr, NULL TSRMLS_CC);
 }
 
 ZEND_API zend_class_entry *zend_exception_get_default(void)
@@ -156,6 +160,11 @@ ZEND_API zend_class_entry *zend_exception_get_default(void)
 	return default_exception_ptr;
 }
 
+ZEND_API zend_class_entry *zend_exception_get_abstract(void)
+{
+	return abstract_exception_ptr;
+}
+
 ZEND_API void zend_throw_exception_ex(zend_class_entry *exception_ce, long code TSRMLS_DC, char *format, ...)
 {
 	zval *ex;

Zend/zend_default_classes.h

@@ -25,6 +25,7 @@
 BEGIN_EXTERN_C()
 
 ZEND_API zend_class_entry *zend_exception_get_default(void);
+ZEND_API zend_class_entry *zend_exception_get_abstract(void);
 ZEND_API void zend_register_default_classes(TSRMLS_D);
 
 /* exception_ce   NULL or zend_exception_get_default() or a derived class 

Zend/zend_exceptions.c

@@ -25,6 +25,7 @@
 #include "zend_builtin_functions.h"
 
 zend_class_entry *default_exception_ptr;
+zend_class_entry *abstract_exception_ptr;
 
 static zend_object_value zend_default_exception_new(zend_class_entry *class_type TSRMLS_DC)
 {
@@ -138,10 +139,10 @@ static zend_function_entry default_exception_functions[] = {
 
 static void zend_register_default_exception(TSRMLS_D)
 {
-	zend_class_entry default_exception;
+	zend_class_entry ce;
 
-	INIT_CLASS_ENTRY(default_exception, "exception", default_exception_functions);
-	default_exception_ptr = zend_register_internal_class(&default_exception TSRMLS_CC);
+	INIT_CLASS_ENTRY(ce, "exception", default_exception_functions);
+	default_exception_ptr = zend_register_internal_class(&ce TSRMLS_CC);
 	default_exception_ptr->create_object = zend_default_exception_new;
 
 	zend_declare_property_string(default_exception_ptr, "message", sizeof("message")-1, "Unknown exception", ZEND_ACC_PROTECTED);
@@ -149,6 +150,9 @@ static void zend_register_default_exception(TSRMLS_D)
 	zend_declare_property_null(default_exception_ptr, "file", sizeof("file")-1, ZEND_ACC_PROTECTED);
 	zend_declare_property_null(default_exception_ptr, "line", sizeof("line")-1, ZEND_ACC_PROTECTED);
 	zend_declare_property_null(default_exception_ptr, "trace", sizeof("trace")-1, ZEND_ACC_PROTECTED);
+
+	INIT_CLASS_ENTRY(ce, "abstract_exception", NULL);
+	abstract_exception_ptr = zend_register_internal_class_ex(&ce, default_exception_ptr, NULL TSRMLS_CC);
 }
 
 ZEND_API zend_class_entry *zend_exception_get_default(void)
@@ -156,6 +160,11 @@ ZEND_API zend_class_entry *zend_exception_get_default(void)
 	return default_exception_ptr;
 }
 
+ZEND_API zend_class_entry *zend_exception_get_abstract(void)
+{
+	return abstract_exception_ptr;
+}
+
 ZEND_API void zend_throw_exception_ex(zend_class_entry *exception_ce, long code TSRMLS_DC, char *format, ...)
 {
 	zval *ex;

Zend/zend_exceptions.h

@@ -25,6 +25,7 @@
 BEGIN_EXTERN_C()
 
 ZEND_API zend_class_entry *zend_exception_get_default(void);
+ZEND_API zend_class_entry *zend_exception_get_abstract(void);
 ZEND_API void zend_register_default_classes(TSRMLS_D);
 
 /* exception_ce   NULL or zend_exception_get_default() or a derived class 

Zend/zend_execute.c

@@ -33,6 +33,7 @@
 #include "zend_extensions.h"
 #include "zend_fast_cache.h"
 #include "zend_ini.h"
+#include "zend_default_classes.h"
 
 #define get_zval_ptr(node, Ts, should_free, type) _get_zval_ptr(node, Ts, should_free TSRMLS_CC)
 #define get_zval_ptr_ptr(node, Ts, type) _get_zval_ptr_ptr(node, Ts TSRMLS_CC)
@@ -2498,7 +2499,12 @@ int zend_do_fcall_common_helper(ZEND_OPCODE_HANDLER_ARGS)
 	zval *current_this;
 	int return_value_used = RETURN_VALUE_USED(EX(opline));
 	zend_bool should_change_scope;
-	
+
+	if (EX(function_state).function->common.fn_flags & ZEND_ACC_ABSTRACT) {
+		zend_throw_exception_ex(zend_exception_get_abstract(), 0 TSRMLS_CC, "Abstract method %s::%s called", EX(function_state).function->common.scope->name, EX(function_state).function->common.function_name);
+		goto fcall_exception;
+	}
+
 	zend_ptr_stack_n_push(&EG(argument_stack), 2, (void *) EX(opline)->extended_value, NULL);
 
 	EX_T(EX(opline)->result.u.var).var.ptr_ptr = &EX_T(EX(opline)->result.u.var).var.ptr;
@@ -2629,6 +2635,7 @@ int zend_do_fcall_common_helper(ZEND_OPCODE_HANDLER_ARGS)
 	EG(function_state_ptr) = &EX(function_state);
 	zend_ptr_stack_clear_multiple(TSRMLS_C);
 
+fcall_exception:
 	if (EG(exception)) {
 		if (return_value_used && EX_T(EX(opline)->result.u.var).var.ptr) {
 			zval_ptr_dtor(&EX_T(EX(opline)->result.u.var).var.ptr);