full qbe support i belive

asm/amd64/codegen.go

@@ -41,7 +41,7 @@ func CgProgram(prog *ttir.Program) *Program {
 	return &newProgram
 }
 
-func cgFunction(f ttir.Function) Function {
+func cgFunction(f *ttir.Function) Function {
 	newInstructions := []Instruction{}
 
 	for _, inst := range f.Instructions {

asm/qbe/qbe.go

@@ -19,6 +19,28 @@ func emitf(w io.Writer, format string, args ...any) error {
 }
 
 func Emit(output io.Writer, input *ttir.Program) error {
+	if input.MainFunction.HasReturnValue {
+		emitf(output, `
+export function $_start() {
+@start
+    %%result =l call $main()
+    call $syscall1(l 60, l %%result)
+    hlt
+}
+            `,
+		)
+	} else {
+		emitf(output, `
+export function $_start() {
+@start
+    call $main()
+    call $syscall1(l 60, l 0)
+    hlt
+}
+`,
+		)
+	}
+
 	for _, f := range input.Functions {
 		err := emitFunction(output, f)
 		if err != nil {
@@ -28,7 +50,7 @@ func Emit(output io.Writer, input *ttir.Program) error {
 	return nil
 }
 
-func emitFunction(w io.Writer, f ttir.Function) error {
+func emitFunction(w io.Writer, f *ttir.Function) error {
 	emitf(w, "export function ")
 	if f.HasReturnValue {
 		if err := emitf(w, "l "); err != nil {

test.tt

@@ -1,6 +1,3 @@
 fn main() = {
-    5 <= 4;
-    5 < 4;
-    5 >= 4;
-    5 > 4;
+    3
 };

ttir/emit.go

@@ -15,27 +15,35 @@ func temp() string {
 }
 
 func EmitProgram(program *tast.Program) *Program {
-	functions := make([]Function, 0)
+	functions := make([]*Function, 0)
+	var mainFunction *Function
 	for _, decl := range program.Declarations {
 		switch decl := decl.(type) {
 		case *tast.FunctionDeclaration:
-			functions = append(functions, *emitFunction(decl))
+			f := emitFunction(decl)
+			functions = append(functions, f)
+			if f.Name == "main" {
+				mainFunction = f
+			}
 		}
 	}
 
 	return &Program{
-		Functions: functions,
+		Functions:    functions,
+		MainFunction: mainFunction,
 	}
 }
 
 func emitFunction(function *tast.FunctionDeclaration) *Function {
 	value, instructions := emitExpression(function.Body)
 	instructions = append(instructions, &Ret{Op: value})
-	return &Function{
+	f := &Function{
 		Name:           function.Name,
 		Instructions:   instructions,
 		HasReturnValue: !function.ReturnType.IsSameType(types.Unit),
 	}
+
+	return f
 }
 
 func emitExpression(expr tast.Expression) (Operand, []Instruction) {

ttir/ttir.go

@@ -8,7 +8,8 @@ import (
 )
 
 type Program struct {
-	Functions []Function
+	Functions    []*Function
+	MainFunction *Function
 }
 
 func (p *Program) String() string {