added a Value type

src/codegen/fasm.rs

@@ -1,18 +1,31 @@
 use crate::parse::ast::*;
 
-pub fn fasm_codegen(expr: Expr) -> String {
+pub fn parse_value(value: Value) -> String {
+    match value {
+	Value::Number(e) => {
+	    return e.to_string();
+	},
+
+	Value::Var(e) => {
+	    return e.name.to_string();
+	}
+    }
+}
+
+pub fn fasm_codegen(exprs: Vec<Expr>) -> String {
     let mut asm_text = String::new();
     let mut asm_data = String::new();
-    
     asm_text.push_str("format ELF64 executable 3\n");
     asm_text.push_str("segment readable executable\n");
     asm_text.push_str("entry _start\n");
     asm_text.push_str("_start:\n");
-    asm_data.push_str("segment readable writeable\n");
+    asm_data.push_str("\nsegment readable writable\n");
+
+    for expr in exprs.iter() {	
 	match expr {
 	    Expr::MathExpr(e) => {
-	    asm_text.push_str(format!("\tmov r10, {:?}\n", e.left).as_str());
+		asm_text.push_str(format!("\tmov r10, {}\n", parse_value(e.left)).as_str());
-	    asm_text.push_str(format!("\tmov r11, {:?}\n", e.right).as_str());
+		asm_text.push_str(format!("\tmov r11, {}\n", parse_value(e.right)).as_str());
 		match e.operator {
 		    // If the operator is addition.
 		    MathOperator::OP_ADD => {
@@ -52,37 +65,37 @@ pub fn fasm_codegen(expr: Expr) -> String {
 		    match i {
 			0 => {
 			    // First parameter. Put in %rdi.
-			asm_text.push_str(format!("\tmov rdi, {:?}\n", p.value).as_str());
+			    asm_text.push_str(format!("\tmov rdi, {:?}\n", parse_value(p.value)).as_str());
 			},
 
 			1 => {
 			    // Second parameter. Put in %rsi.
-			asm_text.push_str(format!("\tmov rsi, {:?}\n", p.value).as_str());
+			    asm_text.push_str(format!("\tmov rsi, {:?}\n", parse_value(p.value)).as_str());
 			},
 
 			2 => {
 			    // Third parameter. Put in %rdx.
-			asm_text.push_str(format!("\tmov rdx, {:?}\n", p.value).as_str());
+			    asm_text.push_str(format!("\tmov rdx, {:?}\n", parse_value(p.value)).as_str());
 			},
 
 			3 => {
 			    // Fourth parameter. Put in %rcx.
-			asm_text.push_str(format!("\tmov rcx, {:?}\n", p.value).as_str());
+			    asm_text.push_str(format!("\tmov rcx, {:?}\n", parse_value(p.value)).as_str());
 			},
 
 			4 => {
 			    // Fifth parameter. Put in %r8.
-			asm_text.push_str(format!("\tmov r8, {:?}\n", p.value).as_str());
+			    asm_text.push_str(format!("\tmov r8, {:?}\n", parse_value(p.value)).as_str());
 			},
 			
 			5 => {
 			    // Sixth parameter. Put in %r9.
-			asm_text.push_str(format!("\tmov r9, {:?}\n", p.value).as_str());
+			    asm_text.push_str(format!("\tmov r9, {:?}\n", parse_value(p.value)).as_str());
 			},
 
 			_ => {
 			    // Parameters after the sixth parameter are pushed to the stack.
-			asm_text.push_str(format!("\tpush {:?}\n", p.value).as_str());
+			    asm_text.push_str(format!("\tpush {:?}\n", parse_value(p.value)).as_str());
 			}
 		    }
 		}
@@ -91,7 +104,7 @@ pub fn fasm_codegen(expr: Expr) -> String {
 	    },
 
 	    Expr::VarDefenition(e) => {
-	    asm_data.push_str(format!("\t{} dq {:?}", e.name, e.value).as_str());
+			asm_data.push_str(format!("\t{} db {:?}", e.name, parse_value(e.value)).as_str());
 	    },
 
 	    Expr::VarReference(e) => {
@@ -100,6 +113,8 @@ pub fn fasm_codegen(expr: Expr) -> String {
 	
 	    _ => unimplemented!("sorry unimplemented"),
 	}
+    }
+
     asm_text.push_str("\tmov rax, 60        ; 60 is the system call number for exit.\n");
     asm_text.push_str("\txor rdi, rdi       ; 0 is the exit code we want.\n");
     asm_text.push_str("\tsyscall            ; this is the instruction to actually perform the system call.");

src/main.rs

@@ -1,3 +1,5 @@
+#![allow(warnings)]
+
 pub mod lex;
 pub mod codegen;
 use crate::codegen::fasm::*;
@@ -5,5 +7,5 @@ use crate::parse::ast::*;
 pub mod parse;
 
 fn main() {
-    fasm_codegen(Expr::MathExpr(Math { left: 30, right: 4, operator: MathOperator::OP_DIV}));
+    fasm_codegen(vec![Expr::VarDefenition(VarDefenition {name: "goren", value: Value::Number(10)}), Expr::MathExpr(Math { left: Value::Var(VarReference {name: "goren"}), right: Value::Number(4), operator: MathOperator::OP_DIV})]);
 }

src/parse/ast.rs

@@ -1,6 +1,6 @@
 #[derive(Debug)]
 pub enum Expr<'a> {
-    MathExpr(Math),
+    MathExpr(Math<'a>),
     FunCall(FunCall<'a>),
     FunDefenition(FunDefenition<'a>),
     VarDefenition(VarDefenition<'a>),
@@ -10,9 +10,9 @@ pub enum Expr<'a> {
 // MATH EXPRESSION
 
 #[derive(Debug)]
-pub struct Math {
+pub struct Math<'a> {
-    pub left: i64,
+    pub left: Value<'a>,
-    pub right: i64,
+    pub right: Value<'a>,
     pub operator: MathOperator
 }
 
@@ -30,7 +30,7 @@ pub enum MathOperator {
 #[derive(Debug)]
 pub struct FunCall<'a> {
     pub name: &'a str,
-    pub params: Vec<FunParamCall>,
+    pub params: Vec<FunParamCall<'a>>,
 }
 
 #[derive(Debug)]
@@ -47,9 +47,8 @@ pub struct FunParamDef<'a> {
 }
 
 #[derive(Debug)]
-pub struct FunParamCall {
+pub struct FunParamCall<'a> {
-    // Everything is a u64 for now.
+    pub value: Value<'a>,
-    pub value: u64,
 }
 
 // VARIABLES
@@ -57,10 +56,16 @@ pub struct FunParamCall {
 #[derive(Debug)]
 pub struct VarDefenition<'a> {
     pub name: &'a str,
-    pub value: u64,
+    pub value: Value<'a>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Copy, Clone)]
 pub struct VarReference<'a> {
     pub name: &'a str,
 }
+
+#[derive(Debug, Copy, Clone)]
+pub enum Value<'a> {
+    Var(VarReference<'a>),
+    Number(u64),
+}