added some more things to the backend

.gitignore

@@ -1 +1,2 @@
 /target
+tags

README.md

@@ -0,0 +1 @@
+# SkyLang

src/codegen/fasm.rs

@@ -1,53 +1,102 @@
 use crate::parse::ast::*;
 
 pub fn fasm_codegen(expr: Expr) -> String {
-    let mut asm = String::new();
-
-    asm.push_str("format ELF64 executable 3\n");
-    asm.push_str("segment readable executable\n");
-    asm.push_str("entry _start\n");
-    asm.push_str("_start:\n");
+    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");
     match expr {
 	Expr::MathExpr(e) => {
-	    asm.push_str(format!("\tmov r10, {:?}\n", e.left).as_str());
-	    asm.push_str(format!("\tmov r11, {:?}\n", e.right).as_str());
+	    asm_text.push_str(format!("\tmov r10, {:?}\n", e.left).as_str());
+	    asm_text.push_str(format!("\tmov r11, {:?}\n", e.right).as_str());
 	    match e.operator {
 		// If the operator is addition.
 		MathOperator::OP_ADD => {
-		    asm.push_str("\tadd r10, r11\n");
-		    asm.push_str("\tmov rax, r10\n");
+		    asm_text.push_str("\tadd r10, r11\n");
+		    asm_text.push_str("\tmov rax, r10\n");
 		},
 		// If the operator is multiplication.
 		MathOperator::OP_MULT => {
-		    asm.push_str("\timul r10, r11\n");
-		    asm.push_str("\tmov rax, r10\n");
+		    asm_text.push_str("\timul r10, r11\n");
+		    asm_text.push_str("\tmov rax, r10\n");
 		},
 		// If the operator is division.
 		MathOperator::OP_DIV => {
-		    asm.push_str("\tmov rax, r10\n");
-		    asm.push_str("\tmov rdx, r11\n");
-		    asm.push_str("\tidiv r10, r11\n");
-		    asm.push_str("\tmov rax, r10\n");
+		    asm_text.push_str("\tmov rax, r10\n");
+		    asm_text.push_str("\tmov rdx, r11\n");
+		    asm_text.push_str("\tidiv r10, r11\n");
+		    asm_text.push_str("\tmov rax, r10\n");
 		},
 		// If the operators is subtraction.
 		MathOperator::OP_SUB => {
-		    asm.push_str("\tsub r10, r11\n");
-		    asm.push_str("\tmov rax, r10\n");
+		    asm_text.push_str("\tsub r10, r11\n");
+		    asm_text.push_str("\tmov rax, r10\n");
 		},
 		// If the operator is modulo.
 		MathOperator::OP_MOD => {
-		    asm.push_str("\tmov rax, r10\n");
-		    asm.push_str("\tmov rdx, r11\n");
-		    asm.push_str("\tidiv r10, r11\n");
-		    asm.push_str("\tmov rax, rdx\n");
+		    asm_text.push_str("\tmov rax, r10\n");
+		    asm_text.push_str("\tmov rdx, r11\n");
+		    asm_text.push_str("\tidiv r10, r11\n");
+		    asm_text.push_str("\tmov rax, rdx\n");
 
-		},
-		_ => unimplemented!("sorry unimplemented"),
+		}
 	    }
 	},
+
+	Expr::FunCall(e) => {
+	    for (i, p) in e.params.iter().enumerate() {
+		match i {
+		    0 => {
+			// First parameter. Put in %rdi.
+			asm_text.push_str(format!("\tmov rdi, {:?}\n", p.value).as_str());
+		    },
+
+		    1 => {
+			// Second parameter. Put in %rsi.
+			asm_text.push_str(format!("\tmov rsi, {:?}\n", p.value).as_str());
+		    },
+
+		    2 => {
+			// Third parameter. Put in %rdx.
+			asm_text.push_str(format!("\tmov rdx, {:?}\n", p.value).as_str());
+		    },
+
+		    3 => {
+			// Fourth parameter. Put in %rcx.
+			asm_text.push_str(format!("\tmov rcx, {:?}\n", p.value).as_str());
+		    },
+
+		    4 => {
+			// Fifth parameter. Put in %r8.
+			asm_text.push_str(format!("\tmov r8, {:?}\n", p.value).as_str());
+		    },
+		    
+		    5 => {
+			// Sixth parameter. Put in %r9.
+			asm_text.push_str(format!("\tmov r9, {:?}\n", 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!("call {:?}", e.name).as_str());
+	},
+
+	Expr::VarDefenition(e) => {
+	    asm_data.push_str(format!("{} dq {:?}", e.name, e.value).as_str());
+	},
+	
 	_ => unimplemented!("sorry unimplemented"),
     }
-
+    let asm = format!("{}{}", asm_text, asm_data);
     println!("{}", asm);
     asm
 }

src/lex/parse.rs

@@ -59,7 +59,7 @@ pub fn match_keyword<'a>(word: &'a str) -> Option<Token<'a>> {
 
         _ => None
     };
-
+    
     tok
 }
 

src/main.rs

@@ -5,5 +5,8 @@ use crate::parse::ast::*;
 pub mod parse;
 
 fn main() {
-    fasm_codegen(Expr::MathExpr(Math {left: 1, right: 2, operator: MathOperator::OP_DIV}));
+    fasm_codegen(Expr::VarDefenition(VarDefenition {
+	name: "hi",
+	value: 100,
+    }));
 }

src/parse/ast.rs

@@ -1,7 +1,9 @@
 #[derive(Debug)]
 pub enum Expr<'a> {
     MathExpr(Math),
-    FunCallExpr(FunCall<'a>),
+    FunCall(FunCall<'a>),
+    FunDefenition(FunDefenition<'a>),
+    VarDefenition(VarDefenition<'a>),
 }
 
 // MATH EXPRESSION
@@ -26,19 +28,31 @@ pub enum MathOperator {
 
 #[derive(Debug)]
 pub struct FunCall<'a> {
-    name: &'a str,
-    params: Vec<FunParam<'a>>,
+    pub name: &'a str,
+    pub params: Vec<FunParamCall>,
 }
 
 #[derive(Debug)]
-pub struct FunDefention<'a> {
+pub struct FunDefenition<'a> {
     name: &'a str,
-    params: Vec<FunParam<'a>>,
+    params: Vec<FunParamDef<'a>>,
     contents: Vec<Expr<'a>>,
-    return_value: Expr<'a>,
+    return_value: &'a Expr<'a>,
 }
 
 #[derive(Debug)]
-pub struct FunParam<'a> {
+pub struct FunParamDef<'a> {
     name: &'a str,
 }
+
+#[derive(Debug)]
+pub struct FunParamCall {
+    // Everything is a u64 for now.
+    pub value: u64,
+}
+
+#[derive(Debug)]
+pub struct VarDefenition<'a> {
+    pub name: &'a str,
+    pub value: u64,
+}