THIS DOES NOT COMPILE, but i still want to be open source
Goren Barak
parent
518ce7b3ad
commit
af2785eabf
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@ -6,3 +6,6 @@ edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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[profile.dev]
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debug=true
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@ -1,49 +1,54 @@
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use crate::parse::ast::*;
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pub fn fasm_codegen(exprs: Vec<Expr>) -> String {
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pub fn fasm_codegen(exprs: &Vec<Expr>, not_a_function: bool) -> String {
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let mut asm_text = String::new();
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let mut asm_data = String::new();
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asm_text.push_str("format ELF64 executable 3\n");
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asm_text.push_str("segment readable executable\n");
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asm_text.push_str("entry _start\n");
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asm_text.push_str("_start:\n");
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asm_data.push_str("\nsegment readable writable\n");
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let mut asm_start = String::new();
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if not_a_function {
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asm_start.push_str("format ELF64 executable 3\n");
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asm_start.push_str("segment readable executable\n");
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asm_start.push_str("entry _start\n");
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asm_start.push_str("_start:\n");
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asm_data.push_str("\nsegment readable writable\n");
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}
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let topush = if not_a_function { &mut asm_start } else { &mut asm_text };
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for expr in exprs.iter() {
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match expr {
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for mut expr in exprs.iter() {
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match &mut expr {
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Expr::MathExpr(e) => {
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asm_text.push_str(format!("\tmov r10, {}\n", e.left.unwrap()).as_str());
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asm_text.push_str(format!("\tmov r11, {}\n", e.right.unwrap()).as_str());
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topush.push_str(format!("\tmov r10, {}\n", e.left.unwrap()).as_str());
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topush.push_str(format!("\tmov r11, {}\n", e.right.unwrap()).as_str());
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match e.operator {
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// If the operator is addition.
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MathOperator::OP_ADD => {
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asm_text.push_str("\tadd r10, r11\n");
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asm_text.push_str("\tmov rax, r10\n");
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MathOperator::OP_ADD => {
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topush.push_str("\tadd r10, r11\n");
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topush.push_str("\tmov rax, r10\n");
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},
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// If the operator is multiplication.
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MathOperator::OP_MULT => {
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asm_text.push_str("\timul r10, r11\n");
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asm_text.push_str("\tmov rax, r10\n");
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topush.push_str("\timul r10, r11\n");
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topush.push_str("\tmov rax, r10\n");
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},
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// If the operator is division.
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MathOperator::OP_DIV => {
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asm_text.push_str("\tmov rax, r10\n");
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asm_text.push_str("\txor rdx, rdx\n");
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asm_text.push_str("\tidiv r11\n");
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MathOperator::OP_DIV => {
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topush.push_str("\tmov rax, r10\n");
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topush.push_str("\txor rdx, rdx\n");
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topush.push_str("\tidiv r11\n");
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// The quotient is now stored in %rax.
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},
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// If the operators is subtraction.
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MathOperator::OP_SUB => {
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asm_text.push_str("\tsub r10, r11\n");
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asm_text.push_str("\tmov rax, r10\n");
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MathOperator::OP_SUB => {
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topush.push_str("\tsub r10, r11\n");
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topush.push_str("\tmov rax, r10\n");
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},
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// If the operator is modulo.
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MathOperator::OP_MOD => {
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asm_text.push_str("\tmov rax, r10\n");
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asm_text.push_str("\txor rdx, rdx\n");
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asm_text.push_str("\tidiv r11\n");
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asm_text.push_str("\tmov rax, rdx\n");
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// The remainder will now be stored in the %rax register.
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MathOperator::OP_MOD => {
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topush.push_str("\tmov rax, r10\n");
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topush.push_str("\txor rdx, rdx\n");
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topush.push_str("\tidiv r11\n");
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topush.push_str("\tmov rax, rdx\n");
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// The remainder will now be stored in the %rax register.
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}
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}
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},
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@ -53,64 +58,72 @@ pub fn fasm_codegen(exprs: Vec<Expr>) -> String {
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match i {
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0 => {
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// First parameter. Put in %rdi.
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asm_text.push_str(format!("\tmov rdi, {}\n", p.value.unwrap()).as_str());
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topush.push_str(format!("\tmov rdi, {}\n", p.value.unwrap()).as_str());
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},
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1 => {
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// Second parameter. Put in %rsi.
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asm_text.push_str(format!("\tmov rsi, {}\n", p.value.unwrap()).as_str());
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topush.push_str(format!("\tmov rsi, {}\n", p.value.unwrap()).as_str());
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},
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2 => {
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// Third parameter. Put in %rdx.
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asm_text.push_str(format!("\tmov rdx, {}\n", p.value.unwrap()).as_str());
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topush.push_str(format!("\tmov rdx, {}\n", p.value.unwrap()).as_str());
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},
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3 => {
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// Fourth parameter. Put in %rcx.
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asm_text.push_str(format!("\tmov rcx, {}\n", p.value.unwrap()).as_str());
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topush.push_str(format!("\tmov rcx, {}\n", p.value.unwrap()).as_str());
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},
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4 => {
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// Fifth parameter. Put in %r8.
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asm_text.push_str(format!("\tmov r8, {}\n", p.value.unwrap()).as_str());
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topush.push_str(format!("\tmov r8, {}\n", p.value.unwrap()).as_str());
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},
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5 => {
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// Sixth parameter. Put in %r9.
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asm_text.push_str(format!("\tmov r9, {}\n", p.value.unwrap()).as_str());
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topush.push_str(format!("\tmov r9, {}\n", p.value.unwrap()).as_str());
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},
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_ => {
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// Parameters after the sixth parameter are pushed to the stack.
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asm_text.push_str(format!("\tpush {}\n", p.value.unwrap()).as_str());
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topush.push_str(format!("\tpush {}\n", p.value.unwrap()).as_str());
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}
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}
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}
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asm_text.push_str(format!("call {}", e.name).as_str());
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topush.push_str(format!("call {}", e.name).as_str());
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},
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Expr::VarDefinition(e) => {
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asm_data.push_str(format!("\t{} dq {}", e.name, e.value.unwrap()).as_str());
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},
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Expr::VarReference(e) => {
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asm_text.push_str(e.name);
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Expr::FunDefinition(e) => {
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topush.push_str(format!("{}:\n", e.name).as_str());
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topush.push_str(fasm_codegen(&e.contents, false).as_str());
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},
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Expr::Breakpoint => {
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asm_text.push_str("\tint3\n");
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Expr::Return(e) => {
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topush.push_str(format!("mov rax, {}", e.unwrap()).as_str());
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},
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Expr::Breakpoint => {
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topush.push_str("\tint3\n");
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},
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_ => unimplemented!("sorry unimplemented"),
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}
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}
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asm_text.push_str("\tmov rax, 60 ; 60 is the system call number for exit.\n");
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asm_text.push_str("\txor rdi, rdi ; 0 is the exit code we want.\n");
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asm_text.push_str("\tsyscall ; this is the instruction to actually perform the system call.");
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let asm = format!("{}{}", asm_text, asm_data);
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if not_a_function {
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asm_start.push_str("\tmov rax, 60 ; 60 is the system call number for exit.\n");
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asm_start.push_str("\txor rdi, rdi ; 0 is the exit code we want.\n");
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asm_start.push_str("\tsyscall ; this is the instruction to actually perform the system call.");
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}
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let asm = format!("{}{}{}", asm_start, asm_text, asm_data);
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println!("{}", asm);
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asm
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}
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@ -7,5 +7,5 @@ use crate::parse::ast::*;
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pub mod parse;
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fn main() {
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fasm_codegen(vec![Expr::VarDefinition(VarDefinition {name: "goren", value: Value::Number(10)}), Expr::MathExpr(Math { left: Value::Var(VarReference { name: "goren"}), right: Value::Number(17), operator: MathOperator::OP_MULT}), Expr::Breakpoint]);
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fasm_codegen(&vec![Expr::VarDefinition(VarDefinition {name: "goren", value: Value::Number(10)}), Expr::MathExpr(Math { left: Value::Var(VarReference { name: "goren"}), right: Value::Number(17), operator: MathOperator::OP_MULT}), Expr::FunDefinition(FunDefinition {name: "adder", contents: vec![Expr::MathExpr(Math {left: Value::Param(ParamReference {param_number: 0}), right: Value::Param(ParamReference {param_number: 1}), operator: MathOperator::OP_ADD})]}), Expr::Breakpoint], true);
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}
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@ -4,7 +4,7 @@ pub enum Expr<'a> {
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FunCall(FunCall<'a>),
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FunDefinition(FunDefinition<'a>),
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VarDefinition(VarDefinition<'a>),
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VarReference(VarReference<'a>),
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Return(Value<'a>),
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Breakpoint
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}
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@ -36,10 +36,8 @@ pub struct FunCall<'a> {
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#[derive(Debug)]
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pub struct FunDefinition<'a> {
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name: &'a str,
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params: Vec<FunParamDef<'a>>,
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contents: Vec<Expr<'a>>,
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return_value: Value<'a>,
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pub name: &'a str,
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pub contents: Vec<Expr<'a>>,
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}
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#[derive(Debug)]
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@ -67,14 +65,14 @@ pub struct VarReference<'a> {
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}
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#[derive(Debug, Copy, Clone)]
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pub struct ParamReference<'a> {
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pub struct ParamReference {
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pub param_number: u64,
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}
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#[derive(Debug, Copy, Clone)]
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pub enum Value<'a> {
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Var(VarReference<'a>),
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Param(ParamReference<'a>),
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Param(ParamReference),
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Number(u64),
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}
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@ -82,7 +80,15 @@ impl<'a> Value<'a> {
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pub fn unwrap(&self) -> String {
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match self {
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Value::Param(e) => {
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match e.param_number {
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0 => { return "rdi".to_string(); },
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1 => { return "rsi".to_string(); },
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2 => { return "rdx".to_string(); },
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3 => { return "rcx".to_string(); },
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4 => { return "r8".to_string(); },
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5 => { return "r9".to_string(); },
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_ => { unimplemented!() }
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}
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},
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Value::Number(e) => {
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