Add a very basic Namespace datastructure

dev.org

@@ -24,6 +24,8 @@ Then here is the list or parsers that we have considered
 
 ** Data structures
 - Pure functional datastructures papaer :: https://www.cs.cmu.edu/~rwh/theses/okasaki.pdf
-
+- Dynamic typing: syntax and proof theory :: https://reader.elsevier.com/reader/sd/pii/0167642394000042?token=CEFF5C5D1B03FD680762FC4889A14C0CA2BB28FE390EC51099984536E12AC358F3D28A5C25C274296ACBBC32E5AE23CD
+- Representing Type Information in Dynamically Typed Languages :: https://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.39.4394
+- An empirical study on the impact of static typing on software maintainability :: https://www.researchgate.net/publication/259634489_An_empirical_study_on_the_impact_of_static_typing_on_software_maintainability
 ** Cranelift
 - Source tree :: https://github.com/bytecodealliance/wasmtime/tree/master/cranelift

src/compiler.rs

@@ -1,18 +1,56 @@
 use inkwell::builder::Builder;
 use inkwell::context::Context;
-use inkwell::module::Module;
+use inkwell::passes::PassManager;
 use inkwell::values::{BasicValue, BasicValueEnum, FloatValue, FunctionValue, PointerValue};
 
+use crate::namespace::Namespace;
 use crate::types::Expression;
 use std::collections::HashMap;
 
 pub struct Compiler<'a, 'ctx> {
-    context: &'ctx Context,
-    builder: &'a Builder<'ctx>,
-    module: &'a Module<'ctx>,
-    scope: HashMap<String, PointerValue<'ctx>>,
+    pub context: &'ctx Context,
+    pub builder: &'a Builder<'ctx>,
+    /// This hashmap contains all the namespaces that has to be compiled and
+    /// maps two different keys to the same namespace. Since namespace names
+    /// can not contain `/` char, the keys of this map are the namespace
+    /// name and the path to the file containing the namespace. For example:
+    ///
+    /// A let's say we have a namespace `abc.xyz`, this namespace will have
+    /// two entries in this hashmap. One would be the ns name itself which
+    /// is `abc.xyz` in this case and the otherone would be
+    /// `/path/to/abc/xyz.srn` file that contains the ns.
+    pub namespaces: HashMap<String, &'a Namespace<'a, 'ctx>>,
+    pub fpm: &'a PassManager<FunctionValue<'ctx>>,
+
+    current_ns_name: Option<&'a str>,
 }
 
 impl<'a, 'ctx> Compiler<'a, 'ctx> {
+    #[inline]
+    pub fn current_ns(&self) -> Option<&'a Namespace<'a, 'ctx>> {
+        let ns = self.current_ns_name?;
+        self.namespaces.get(ns).map(|x| *x)
+    }
+
+    /// Returns the `FunctionValue` representing the function being compiled.
+    #[inline]
+    pub fn current_fn(&self) -> FunctionValue<'ctx> {
+        self.current_ns().unwrap().current_fn()
+    }
+
+    /// Creates a new stack allocation instruction in the entry block of the function.
+    fn create_entry_block_alloca(&self, name: &str) -> PointerValue<'ctx> {
+        let builder = self.context.create_builder();
+
+        let entry = self.current_fn().get_first_basic_block().unwrap();
+
+        match entry.get_first_instruction() {
+            Some(first_instr) => builder.position_before(&first_instr),
+            None => builder.position_at_end(entry),
+        }
+
+        builder.build_alloca(self.context.f64_type(), name)
+    }
+
     pub fn compile(exprs: &impl Expression) {}
 }

src/main.rs

@@ -8,6 +8,7 @@ use std::string::String;
 
 pub mod ast;
 pub mod compiler;
+pub mod namespace;
 pub mod reader;
 pub mod types;
 

src/namespace.rs

@@ -0,0 +1,29 @@
+use inkwell::module::Module;
+use inkwell::values::{FunctionValue, PointerValue};
+use std::collections::HashMap;
+
+pub struct Namespace<'a, 'ctx> {
+    /// Each namespace in serene contains it's own LLVM module. You can
+    /// think of modules as compilation units. Object files if you prefer.
+    /// This way we should be able to hot swap the namespaces.
+    pub module: &'a Module<'ctx>,
+
+    scope: HashMap<String, PointerValue<'ctx>>,
+
+    // The option of the current function being compiled
+    current_fn_opt: Option<FunctionValue<'ctx>>,
+}
+
+impl<'a, 'ctx> Namespace<'a, 'ctx> {
+    /// Gets a defined function given its name.
+    #[inline]
+    pub fn get_function(&self, name: &str) -> Option<FunctionValue<'ctx>> {
+        self.module.get_function(name)
+    }
+
+    /// Returns the `FunctionValue` representing the function being compiled.
+    #[inline]
+    pub fn current_fn(&self) -> FunctionValue<'ctx> {
+        self.current_fn_opt.unwrap()
+    }
+}