Add function type helper function

Follow up to #254

src/zend/ex.rs

@@ -6,6 +6,8 @@ use crate::{
     types::{ZendClassObject, ZendObject, Zval},
 };
 
+use super::function::Function;
+
 /// Execute data passed when a function is called from PHP.
 ///
 /// This generally contains things related to the call, including but not
@@ -194,6 +196,16 @@ impl ExecuteData {
         self.This.object_mut()
     }
 
+    /// Attempt to retrieve the function that is being called.
+    pub fn function(&self) -> Option<&Function> {
+        unsafe { self.func.as_ref() }
+    }
+
+    /// Attempt to retrieve the previous execute data on the call stack.
+    pub fn previous(&self) -> Option<&Self> {
+        unsafe { self.prev_execute_data.as_ref() }
+    }
+
     /// Translation of macro `ZEND_CALL_ARG(call, n)`
     /// zend_compile.h:578
     ///

src/zend/function.rs

@@ -2,7 +2,10 @@
 
 use std::{fmt::Debug, os::raw::c_char, ptr};
 
-use crate::ffi::zend_function_entry;
+use crate::{
+    ffi::{zend_function, zend_function_entry},
+    flags::FunctionType,
+};
 
 /// A Zend function entry.
 pub type FunctionEntry = zend_function_entry;
@@ -36,3 +39,11 @@ impl FunctionEntry {
         Box::into_raw(Box::new(self))
     }
 }
+
+pub type Function = zend_function;
+
+impl Function {
+    pub fn type_(&self) -> FunctionType {
+        FunctionType::from(unsafe { self.type_ })
+    }
+}