From 75bd9b9a1510cb4b95ae7bad7a6a9be2ae8321b1 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sat, 19 Dec 2020 15:29:39 +0800
Subject: [PATCH] nac3embedded: ast storage

---
 nac3embedded/language.py |   4 +-
 nac3embedded/src/lib.rs  | 117 +++++++++++++++++++++++++++++++++------
 2 files changed, 103 insertions(+), 18 deletions(-)

diff --git a/nac3embedded/language.py b/nac3embedded/language.py
index 57e10d93..1fdee5bf 100644
--- a/nac3embedded/language.py
+++ b/nac3embedded/language.py
@@ -9,7 +9,9 @@ __all__ = ["kernel", "portable"]
 def kernel(function):
     @wraps(function)
     def run_on_core(self, *args, **kwargs):
-        nac3embedded.add_host_object(self)
+        nac3 = nac3embedded.NAC3()
+        nac3.register_host_object(self)
+        nac3.compile_method(self, function.__name__)
     return run_on_core
 
 
diff --git a/nac3embedded/src/lib.rs b/nac3embedded/src/lib.rs
index bffe2374..91165859 100644
--- a/nac3embedded/src/lib.rs
+++ b/nac3embedded/src/lib.rs
@@ -1,24 +1,107 @@
-use pyo3::prelude::*;
-use pyo3::wrap_pyfunction;
-use pyo3::exceptions;
-use rustpython_parser::parser;
+use std::collections::HashMap;
+use std::collections::hash_map::Entry;
 
-#[pyfunction]
-fn add_host_object(obj: PyObject) -> PyResult<()> {
-    Python::with_gil(|py| -> PyResult<()> {
-        let obj: &PyAny = obj.extract(py)?;
-        let inspect = PyModule::import(py, "inspect")?;
-        let source = inspect.call1("getsource", (obj.get_type(), ))?;
-        let ast = parser::parse_program(source.extract()?).map_err(|e|
-            exceptions::PySyntaxError::new_err(format!("failed to parse host object source: {}", e)))?;
-        println!("{:?}", ast);
-        Ok(())
-    })?;
-    Ok(())
+use pyo3::prelude::*;
+use pyo3::exceptions;
+use rustpython_parser::{ast, parser};
+
+fn runs_on_core(decorator_list: &[ast::Expression]) -> bool {
+    for decorator in decorator_list.iter() {
+        if let ast::ExpressionType::Identifier { name } = &decorator.node {
+            if name == "kernel" || name == "portable" {
+                return true
+            }
+        }
+    }
+    false
+}
+
+#[pyclass(name=NAC3)]
+struct Nac3 {
+    type_definitions: HashMap<i64, ast::Program>,
+    host_objects: HashMap<i64, i64>,
+}
+
+#[pymethods]
+impl Nac3 {
+    #[new]
+    fn new() -> Self {
+        Nac3 {
+            type_definitions: HashMap::new(),
+            host_objects: HashMap::new(),
+        }
+    }
+
+    fn register_host_object(&mut self, obj: PyObject) -> PyResult<()> {
+        Python::with_gil(|py| -> PyResult<()> {
+            let obj: &PyAny = obj.extract(py)?;
+            let obj_type = obj.get_type();
+
+            let builtins = PyModule::import(py, "builtins")?;
+            let type_id = builtins.call1("id", (obj_type, ))?.extract()?;
+
+            let entry = self.type_definitions.entry(type_id);
+            if let Entry::Vacant(entry) = entry {
+                let source = PyModule::import(py, "inspect")?.call1("getsource", (obj_type, ))?;
+                let ast = parser::parse_program(source.extract()?).map_err(|e|
+                    exceptions::PySyntaxError::new_err(format!("failed to parse host object source: {}", e)))?;
+                entry.insert(ast);
+                // TODO: examine AST and recursively register dependencies
+            };
+
+            let obj_id = builtins.call1("id", (obj, ))?.extract()?;
+            match self.host_objects.entry(obj_id) {
+                Entry::Vacant(entry) => entry.insert(type_id),
+                Entry::Occupied(_) => return Err(
+                    exceptions::PyValueError::new_err("host object registered twice")),
+            };
+            // TODO: collect other information about host object, e.g. value of fields
+
+            Ok(())
+        })
+    }
+
+    fn compile_method(&self, obj: PyObject, name: String) -> PyResult<()> {
+        Python::with_gil(|py| -> PyResult<()> {
+            let obj: &PyAny = obj.extract(py)?;
+            let builtins = PyModule::import(py, "builtins")?;
+            let obj_id = builtins.call1("id", (obj, ))?.extract()?;
+
+            let type_id = self.host_objects.get(&obj_id).ok_or_else(||
+                exceptions::PyKeyError::new_err("type of host object not found"))?;
+            let ast = self.type_definitions.get(&type_id).ok_or_else(||
+                exceptions::PyKeyError::new_err("type definition not found"))?;
+
+            if let ast::StatementType::ClassDef {
+                    name: _,
+                    body,
+                    bases: _,
+                    keywords: _,
+                    decorator_list: _ } = &ast.statements[0].node {
+                for statement in body.iter() {
+                    if let ast::StatementType::FunctionDef {
+                            is_async: _,
+                            name: funcdef_name,
+                            args: _,
+                            body: _,
+                            decorator_list,
+                            returns: _ } = &statement.node {
+                        if runs_on_core(decorator_list) && funcdef_name == &name {
+                            println!("found: {:?}", &statement.node);
+                        }
+                    }
+                }
+            } else {
+                return Err(exceptions::PyValueError::new_err("expected ClassDef for type definition"));
+            }
+
+            Ok(())
+        })
+    }
 }
 
 #[pymodule]
 fn nac3embedded(_py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_function(wrap_pyfunction!(add_host_object, m)?)?;
+    m.add_class::<Nac3>()?;
     Ok(())
 }