diff --git a/CHANGELOG.md b/CHANGELOG.md
index 704d7fc2..f9f0371b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Changed
 - `prepare_freethreaded_python` will no longer register an `atexit` handler to call `Py_Finalize`. [#1355](https://github.com/PyO3/pyo3/pull/1355)
+- Mark FFI definitions `PyMarshal_WriteObjectToString`, `PyMarshal_ReadObjectFromString` as available in limited API.
+- Mark FFI definitions `PyListObject` and those from `funcobject.h` as requiring non-limited API.
+- Fix typo in FFI definition `PyFunction_Code` to `PyFunction_GetCode`.
 
 ### Fixed
 - Fix support for using `r#raw_idents` as argument names in pyfunctions. [#1383](https://github.com/PyO3/pyo3/pull/1383)
diff --git a/src/ffi/cpython/listobject.rs b/src/ffi/cpython/listobject.rs
new file mode 100644
index 00000000..e0f583ad
--- /dev/null
+++ b/src/ffi/cpython/listobject.rs
@@ -0,0 +1,31 @@
+use crate::ffi::object::*;
+use crate::ffi::pyport::Py_ssize_t;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct PyListObject {
+    pub ob_base: PyVarObject,
+    pub ob_item: *mut *mut PyObject,
+    pub allocated: Py_ssize_t,
+}
+
+// skipped _PyList_Extend
+// skipped _PyList_DebugMallocStats
+// skipped _PyList_CAST (used inline below)
+
+/// Macro, trading safety for speed
+#[inline]
+pub unsafe fn PyList_GET_ITEM(op: *mut PyObject, i: Py_ssize_t) -> *mut PyObject {
+    *(*(op as *mut PyListObject)).ob_item.offset(i as isize)
+}
+
+/// Macro, *only* to be used to fill in brand new lists
+#[inline]
+pub unsafe fn PyList_SET_ITEM(op: *mut PyObject, i: Py_ssize_t, v: *mut PyObject) {
+    *(*(op as *mut PyListObject)).ob_item.offset(i as isize) = v;
+}
+
+#[inline]
+pub unsafe fn PyList_GET_SIZE(op: *mut PyObject) -> Py_ssize_t {
+    Py_SIZE(op)
+}
diff --git a/src/ffi/cpython/mod.rs b/src/ffi/cpython/mod.rs
index f376b939..0150f2a2 100644
--- a/src/ffi/cpython/mod.rs
+++ b/src/ffi/cpython/mod.rs
@@ -9,6 +9,9 @@ pub mod dictobject;
 // skipped fileobject.h
 pub mod frameobject;
 // skipped import.h
+// skipped initconfig.h
+// skipped interpreteridobject.h
+pub mod listobject;
 
 pub use self::abstract_::*;
 #[cfg(not(PyPy))]
@@ -18,3 +21,4 @@ pub use self::code::*;
 #[cfg(not(PyPy))]
 pub use self::dictobject::*;
 pub use self::frameobject::*;
+pub use self::listobject::*;
diff --git a/src/ffi/funcobject.rs b/src/ffi/funcobject.rs
index e57a87a7..f5ec3d87 100644
--- a/src/ffi/funcobject.rs
+++ b/src/ffi/funcobject.rs
@@ -2,27 +2,27 @@ use std::os::raw::c_int;
 
 use crate::ffi::object::{PyObject, PyTypeObject, Py_TYPE};
 
+// skipped PyFunctionObject
+
 #[cfg_attr(windows, link(name = "pythonXY"))]
 extern "C" {
-    #[cfg(not(Py_LIMITED_API))]
     #[cfg_attr(PyPy, link_name = "PyPyFunction_Type")]
     pub static mut PyFunction_Type: PyTypeObject;
 }
 
-#[cfg(not(Py_LIMITED_API))]
 #[inline]
 pub unsafe fn PyFunction_Check(op: *mut PyObject) -> c_int {
     (Py_TYPE(op) == &mut PyFunction_Type) as c_int
 }
 
 extern "C" {
+    pub fn PyFunction_New(code: *mut PyObject, globals: *mut PyObject) -> *mut PyObject;
     pub fn PyFunction_NewWithQualName(
         code: *mut PyObject,
         globals: *mut PyObject,
         qualname: *mut PyObject,
     ) -> *mut PyObject;
-    pub fn PyFunction_New(code: *mut PyObject, globals: *mut PyObject) -> *mut PyObject;
-    pub fn PyFunction_Code(op: *mut PyObject) -> *mut PyObject;
+    pub fn PyFunction_GetCode(op: *mut PyObject) -> *mut PyObject;
     pub fn PyFunction_GetGlobals(op: *mut PyObject) -> *mut PyObject;
     pub fn PyFunction_GetModule(op: *mut PyObject) -> *mut PyObject;
     pub fn PyFunction_GetDefaults(op: *mut PyObject) -> *mut PyObject;
@@ -34,3 +34,17 @@ extern "C" {
     pub fn PyFunction_GetAnnotations(op: *mut PyObject) -> *mut PyObject;
     pub fn PyFunction_SetAnnotations(op: *mut PyObject, annotations: *mut PyObject) -> c_int;
 }
+
+// skipped _PyFunction_Vectorcall
+// skipped PyFunction_GET_CODE
+// skipped PyFunction_GET_GLOBALS
+// skipped PyFunction_GET_MODULE
+// skipped PyFunction_GET_DEFAULTS
+// skipped PyFunction_GET_KW_DEFAULTS
+// skipped PyFunction_GET_CLOSURE
+// skipped PyFunction_GET_ANNOTATIONS
+
+// skipped PyClassMethod_Type
+// skipped PyStaticMethod_Type
+// skipped PyClassMethod_New
+// skipped PyStaticMethod_New
diff --git a/src/ffi/listobject.rs b/src/ffi/listobject.rs
index 2e14e206..cc9ca0de 100644
--- a/src/ffi/listobject.rs
+++ b/src/ffi/listobject.rs
@@ -2,14 +2,6 @@ use crate::ffi::object::*;
 use crate::ffi::pyport::Py_ssize_t;
 use std::os::raw::c_int;
 
-#[repr(C)]
-#[derive(Copy, Clone)]
-pub struct PyListObject {
-    pub ob_base: PyVarObject,
-    pub ob_item: *mut *mut PyObject,
-    pub allocated: Py_ssize_t,
-}
-
 #[cfg_attr(windows, link(name = "pythonXY"))]
 extern "C" {
     #[cfg_attr(PyPy, link_name = "PyPyList_Type")]
@@ -28,26 +20,6 @@ pub unsafe fn PyList_CheckExact(op: *mut PyObject) -> c_int {
     (Py_TYPE(op) == &mut PyList_Type) as c_int
 }
 
-/// Macro, trading safety for speed
-#[cfg(not(Py_LIMITED_API))]
-#[inline]
-pub unsafe fn PyList_GET_ITEM(op: *mut PyObject, i: Py_ssize_t) -> *mut PyObject {
-    *(*(op as *mut PyListObject)).ob_item.offset(i as isize)
-}
-
-#[cfg(not(Py_LIMITED_API))]
-#[inline]
-pub unsafe fn PyList_GET_SIZE(op: *mut PyObject) -> Py_ssize_t {
-    Py_SIZE(op)
-}
-
-/// Macro, *only* to be used to fill in brand new lists
-#[cfg(not(Py_LIMITED_API))]
-#[inline]
-pub unsafe fn PyList_SET_ITEM(op: *mut PyObject, i: Py_ssize_t, v: *mut PyObject) {
-    *(*(op as *mut PyListObject)).ob_item.offset(i as isize) = v;
-}
-
 extern "C" {
     #[cfg_attr(PyPy, link_name = "PyPyList_New")]
     pub fn PyList_New(size: Py_ssize_t) -> *mut PyObject;
diff --git a/src/ffi/longobject.rs b/src/ffi/longobject.rs
index 5d2e862b..09d995d4 100644
--- a/src/ffi/longobject.rs
+++ b/src/ffi/longobject.rs
@@ -5,11 +5,7 @@ use std::os::raw::{
     c_char, c_double, c_int, c_long, c_longlong, c_uchar, c_ulong, c_ulonglong, c_void,
 };
 
-/// This is an opaque type in the python c api
-#[repr(C)]
-pub struct PyLongObject {
-    _unused: [u8; 0],
-}
+opaque_struct!(PyLongObject);
 
 #[cfg_attr(windows, link(name = "pythonXY"))]
 extern "C" {
@@ -50,7 +46,24 @@ extern "C" {
     pub fn PyLong_AsUnsignedLong(arg1: *mut PyObject) -> c_ulong;
     #[cfg_attr(PyPy, link_name = "PyPyLong_AsUnsignedLongMask")]
     pub fn PyLong_AsUnsignedLongMask(arg1: *mut PyObject) -> c_ulong;
+    // skipped non-limited _PyLong_AsInt
     pub fn PyLong_GetInfo() -> *mut PyObject;
+    // skipped PyLong_AS_LONG
+
+    // skipped PyLong_FromPid
+    // skipped PyLong_AsPid
+    // skipped _Py_PARSE_INTPTR
+    // skipped _Py_PARSE_UINTPTR
+
+    // skipped non-limited _PyLong_UnsignedShort_Converter
+    // skipped non-limited _PyLong_UnsignedInt_Converter
+    // skipped non-limited _PyLong_UnsignedLong_Converter
+    // skipped non-limited _PyLong_UnsignedLongLong_Converter
+    // skipped non-limited _PyLong_Size_t_Converter
+
+    // skipped non-limited _PyLong_DigitValue
+    // skipped non-limited _PyLong_Frexp
+
     #[cfg_attr(PyPy, link_name = "PyPyLong_AsDouble")]
     pub fn PyLong_AsDouble(arg1: *mut PyObject) -> c_double;
     #[cfg_attr(PyPy, link_name = "PyPyLong_FromVoidPtr")]
@@ -75,15 +88,19 @@ extern "C" {
         arg2: *mut *mut c_char,
         arg3: c_int,
     ) -> *mut PyObject;
-    pub fn PyOS_strtoul(arg1: *const c_char, arg2: *mut *mut c_char, arg3: c_int) -> c_ulong;
-    pub fn PyOS_strtol(arg1: *const c_char, arg2: *mut *mut c_char, arg3: c_int) -> c_long;
 }
+// skipped non-limited PyLong_FromUnicodeObject
+// skipped non-limited _PyLong_FromBytes
 
 #[cfg(not(Py_LIMITED_API))]
 extern "C" {
+    // skipped non-limited _PyLong_Sign
+
     #[cfg(not(PyPy))]
     pub fn _PyLong_NumBits(obj: *mut PyObject) -> c_int;
 
+    // skipped _PyLong_DivmodNear
+
     #[cfg_attr(PyPy, link_name = "_PyPyLong_FromByteArray")]
     pub fn _PyLong_FromByteArray(
         bytes: *const c_uchar,
@@ -101,3 +118,17 @@ extern "C" {
         is_signed: c_int,
     ) -> c_int;
 }
+
+// skipped non-limited _PyLong_Format
+// skipped non-limited _PyLong_FormatWriter
+// skipped non-limited _PyLong_FormatBytesWriter
+// skipped non-limited _PyLong_FormatAdvancedWriter
+
+extern "C" {
+    pub fn PyOS_strtoul(arg1: *const c_char, arg2: *mut *mut c_char, arg3: c_int) -> c_ulong;
+    pub fn PyOS_strtol(arg1: *const c_char, arg2: *mut *mut c_char, arg3: c_int) -> c_long;
+}
+
+// skipped non-limited _PyLong_GCD
+// skipped non-limited _PyLong_Rshift
+// skipped non-limited _PyLong_Lshift
diff --git a/src/ffi/marshal.rs b/src/ffi/marshal.rs
index 01494ce6..562f6f91 100644
--- a/src/ffi/marshal.rs
+++ b/src/ffi/marshal.rs
@@ -1,11 +1,19 @@
-use super::PyObject;
+use super::{PyObject, Py_ssize_t};
 use std::os::raw::{c_char, c_int};
 
-#[cfg(not(Py_LIMITED_API))]
+// skipped Py_MARSHAL_VERSION
+// skipped PyMarshal_WriteLongToFile
+// skipped PyMarshal_WriteObjectToFile
+
 extern "C" {
     #[cfg_attr(PyPy, link_name = "PyPyMarshal_WriteObjectToString")]
     pub fn PyMarshal_WriteObjectToString(object: *mut PyObject, version: c_int) -> *mut PyObject;
 
+    // skipped non-limited PyMarshal_ReadLongFromFile
+    // skipped non-limited PyMarshal_ReadShortFromFile
+    // skipped non-limited PyMarshal_ReadObjectFromFile
+    // skipped non-limited PyMarshal_ReadLastObjectFromFile
+
     #[cfg_attr(PyPy, link_name = "PyPyMarshal_ReadObjectFromString")]
-    pub fn PyMarshal_ReadObjectFromString(data: *const c_char, len: isize) -> *mut PyObject;
+    pub fn PyMarshal_ReadObjectFromString(data: *const c_char, len: Py_ssize_t) -> *mut PyObject;
 }
diff --git a/src/ffi/memoryobject.rs b/src/ffi/memoryobject.rs
index 7351d9fe..8ca27d79 100644
--- a/src/ffi/memoryobject.rs
+++ b/src/ffi/memoryobject.rs
@@ -2,6 +2,8 @@ use crate::ffi::object::*;
 use crate::ffi::pyport::Py_ssize_t;
 use std::os::raw::{c_char, c_int};
 
+// skipped non-limited _PyManagedBuffer_Type
+
 #[cfg_attr(windows, link(name = "pythonXY"))]
 extern "C" {
     #[cfg_attr(PyPy, link_name = "PyPyMemoryView_Type")]
@@ -13,6 +15,9 @@ pub unsafe fn PyMemoryView_Check(op: *mut PyObject) -> c_int {
     (Py_TYPE(op) == &mut PyMemoryView_Type) as c_int
 }
 
+// skipped non-limited PyMemoryView_GET_BUFFER
+// skipped non-limited PyMemeryView_GET_BASE
+
 extern "C" {
     #[cfg_attr(PyPy, link_name = "PyPyMemoryView_FromObject")]
     pub fn PyMemoryView_FromObject(base: *mut PyObject) -> *mut PyObject;
@@ -22,9 +27,15 @@ extern "C" {
         size: Py_ssize_t,
         flags: c_int,
     ) -> *mut PyObject;
+    // skipped non-limited PyMemoryView_FromBuffer
     pub fn PyMemoryView_GetContiguous(
         base: *mut PyObject,
         buffertype: c_int,
         order: c_char,
     ) -> *mut PyObject;
 }
+
+// skipped remainder of file with comment:
+/* The structs are declared here so that macros can work, but they shouldn't
+be considered public. Don't access their fields directly, use the macros
+and functions instead! */
diff --git a/src/ffi/mod.rs b/src/ffi/mod.rs
index 0d55a607..855b1e2a 100644
--- a/src/ffi/mod.rs
+++ b/src/ffi/mod.rs
@@ -30,6 +30,7 @@ pub use self::enumobject::*;
 pub use self::eval::*;
 pub use self::fileobject::*;
 pub use self::floatobject::*;
+#[cfg(not(Py_LIMITED_API))]
 pub use self::funcobject::*;
 #[cfg(not(Py_LIMITED_API))]
 pub use self::genobject::*;
@@ -111,6 +112,8 @@ mod fileobject; // TODO: incomplete
 mod floatobject; // TODO supports PEP-384 only
 
 // skipped empty frameobject.h
+#[cfg(not(Py_LIMITED_API))]
+pub(crate) mod funcobject;
 // skipped genericaliasobject.h
 #[cfg(not(Py_LIMITED_API))]
 mod genobject; // TODO: incomplete
@@ -119,9 +122,11 @@ mod import; // TODO: incomplete
 // skipped interpreteridobject.h
 mod intrcheck; // TODO supports PEP-384 only
 mod iterobject;
-mod listobject; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
-
+mod listobject;
 // skipped longintrepr.h
+mod longobject;
+pub(crate) mod marshal;
+mod memoryobject;
 // skipped namespaceobject.h
 // skipped odictobject.h
 // skipped opcode.h
@@ -164,17 +169,14 @@ mod pyhash;
 mod pymem;
 mod typeslots;
 
-mod longobject;
 mod unicodeobject; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
                    // mod longintrepr; TODO excluded by PEP-384
-mod memoryobject; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
 mod rangeobject; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
 mod tupleobject; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
                  // mod odictobject; TODO new in 3.5
 mod methodobject; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
 mod moduleobject;
 mod setobject; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
-               // mod funcobject; TODO excluded by PEP-384
                // mod classobject; TODO excluded by PEP-384
 mod pycapsule; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
 mod sliceobject;
@@ -209,9 +211,5 @@ mod pystrtod; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and
 // Additional headers that are not exported by Python.h
 pub mod structmember; // TODO supports PEP-384 only; needs adjustment for Python 3.3 and 3.5
 
-pub(crate) mod marshal;
-
-pub(crate) mod funcobject;
-
 #[cfg(not(Py_LIMITED_API))]
 mod cpython;