adding directives

hblang/examples/directives.hb

@@ -0,0 +1,9 @@
+
+Type := struct {
+	brah: int,
+	blah: int,
+}
+
+main := fn(): int {
+	return @eca(int, 1, Type.(10, 20), @sizeof(Type), @alignof(Type), 5, 6);
+}

hblang/src/codegen.rs

@@ -129,6 +129,7 @@ enum Ctx {
     None,
     Inferred(Type),
     Dest(Value),
+    DestUntyped(Loc, u64),
 }
 
 impl Ctx {
@@ -139,6 +140,14 @@ impl Ctx {
             _ => return None,
         })
     }
+
+    fn loc(self) -> Option<Loc> {
+        Some(match self {
+            Self::Dest(Value { loc, .. }) => loc,
+            Self::DestUntyped(loc, ..) => loc,
+            _ => return None,
+        })
+    }
 }
 
 pub mod bt {
@@ -734,8 +743,129 @@ impl<'a> Codegen<'a> {
         self.expr_ctx(expr, Ctx::default())
     }
 
-    fn expr_ctx(&mut self, expr: &'a parser::Expr<'a>, ctx: Ctx) -> Option<Value> {
+    fn expr_ctx(&mut self, expr: &'a parser::Expr<'a>, mut ctx: Ctx) -> Option<Value> {
         let value = match *expr {
+            E::Directive {
+                name: "eca",
+                args: [ret_ty, args @ ..],
+                ..
+            } => {
+                let mut parama = 3..12;
+                let mut values = Vec::with_capacity(args.len());
+                for arg in args {
+                    let arg = self.expr(arg)?;
+                    self.pass_arg(&arg, &mut parama);
+                    values.push(arg.loc);
+                }
+                drop(values);
+
+                let ty = self.ty(ret_ty);
+                let loc = self.alloc_ret_loc(ty, ctx);
+
+                self.code.encode(instrs::eca());
+
+                self.post_process_ret_loc(ty, &loc);
+
+                return Some(Value { ty, loc });
+            }
+            E::Directive {
+                name: "sizeof",
+                args: [ty],
+                ..
+            } => {
+                let ty = self.ty(ty);
+                let loc = Loc::Imm(self.size_of(ty));
+                return Some(Value { ty: bt::UINT, loc });
+            }
+            E::Directive {
+                name: "alignof",
+                args: [ty],
+                ..
+            } => {
+                let ty = self.ty(ty);
+                let loc = Loc::Imm(self.align_of(ty));
+                return Some(Value { ty: bt::UINT, loc });
+            }
+            E::Directive {
+                name: "intcast",
+                args: [val],
+                ..
+            } => {
+                let Some(ty) = ctx.ty() else {
+                    self.report(
+                        expr.pos(),
+                        "type to cast to is unknown, use `@as(<type>, <expr>)`",
+                    );
+                };
+                let mut val = self.expr(val)?;
+
+                let from_size = self.size_of(val.ty);
+                let to_size = self.size_of(ty);
+
+                if from_size < to_size && bt::is_signed(val.ty) {
+                    let reg = self.loc_to_reg(val.loc, from_size);
+                    let op =
+                        [instrs::sxt8, instrs::sxt16, instrs::sxt32][from_size.ilog2() as usize];
+                    self.code.encode(op(reg.0, reg.0));
+                    val.loc = Loc::Reg(reg);
+                }
+
+                Some(Value { ty, loc: val.loc })
+            }
+            E::Directive {
+                name: "bitcast",
+                args: [val],
+                ..
+            } => {
+                let Some(ty) = ctx.ty() else {
+                    self.report(
+                        expr.pos(),
+                        "type to cast to is unknown, use `@as(<type>, <expr>)`",
+                    );
+                };
+
+                let size = self.size_of(ty);
+
+                ctx = match ctx {
+                    Ctx::Dest(Value { loc, .. }) | Ctx::DestUntyped(loc, ..) => {
+                        Ctx::DestUntyped(loc, size as _)
+                    }
+                    _ => Ctx::None,
+                };
+
+                let val = self.expr_ctx(val, ctx)?;
+
+                if self.size_of(val.ty) != size {
+                    self.report(
+                        expr.pos(),
+                        format_args!(
+                            "cannot bitcast {} to {} (different sizes: {} != {size})",
+                            self.display_ty(val.ty),
+                            self.display_ty(ty),
+                            self.size_of(val.ty),
+                        ),
+                    );
+                }
+
+                // TODO: maybe check align
+
+                return Some(Value { ty, loc: val.loc });
+            }
+            E::Directive {
+                name: "as",
+                args: [ty, val],
+                ..
+            } => {
+                let ty = self.ty(ty);
+                let ctx = match ctx {
+                    Ctx::Dest(dest) => Ctx::Dest(dest),
+                    Ctx::DestUntyped(loc, size) if self.size_of(ty) == size => {
+                        Ctx::Dest(Value { ty, loc })
+                    }
+                    _ => Ctx::Inferred(ty),
+                };
+                return self.expr_ctx(val, ctx);
+            }
             E::Bool { value, .. } => Some(Value {
                 ty:  bt::BOOL,
                 loc: Loc::Imm(value as u64),
@@ -748,8 +878,8 @@ impl<'a> Codegen<'a> {
                 };
                 let size = self.size_of(ty);
 
-                let loc = match ctx {
-                    Ctx::Dest(dest) => dest.loc,
+                let loc = match ctx.loc() {
+                    Some(loc) => loc,
                     _ => Loc::Stack(self.alloc_stack(size), 0),
                 };
 
@@ -878,40 +1008,11 @@ impl<'a> Codegen<'a> {
                 }
                 drop(values);
 
-                let size = self.size_of(fn_label.ret);
-                let loc = match size {
-                    0 => Loc::Imm(0),
-                    ..=8 => Loc::RegRef(1),
-                    ..=16 => match ctx {
-                        Ctx::Dest(dest) => dest.loc,
-                        _ => Loc::Stack(self.alloc_stack(size), 0),
-                    },
-                    ..=u64::MAX => {
-                        let val = match ctx {
-                            Ctx::Dest(dest) => dest.loc,
-                            _ => Loc::Stack(self.alloc_stack(size), 0),
-                        };
-                        let (ptr, off) = val.ref_to_ptr();
-                        self.code.encode(instrs::cp(1, ptr));
-                        self.code.addi64(1, ptr, off);
-                        val
-                    }
-                };
+                let loc = self.alloc_ret_loc(fn_label.ret, ctx);
 
                 self.code.call(func);
 
-                match size {
-                    0 => {}
-                    ..=8 => {}
-                    ..=16 => {
-                        if let Loc::Stack(ref stack, off) = loc {
-                            self.store_stack(1, stack.offset + off, 16);
-                        } else {
-                            unreachable!()
-                        }
-                    }
-                    ..=u64::MAX => {}
-                }
+                self.post_process_ret_loc(fn_label.ret, &loc);
 
                 return Some(Value {
                     ty: fn_label.ret,
@@ -1156,11 +1257,18 @@ impl<'a> Codegen<'a> {
             ast => unimplemented!("{:#?}", ast),
         }?;
 
-        if let Ctx::Dest(dest) = ctx {
-            self.assign(dest.ty, dest.loc, value.loc);
-            Some(Value::VOID)
-        } else {
-            Some(value)
+        match ctx {
+            Ctx::Dest(dest) => {
+                _ = self.assert_ty(expr.pos(), dest.ty, value.ty);
+                self.assign(dest.ty, dest.loc, value.loc)?;
+                Some(Value::VOID)
+            }
+            Ctx::DestUntyped(loc, size) => {
+                // Wo dont check since bitcast does
+                self.assign_opaque(size, loc, value.loc);
+                Some(Value::VOID)
+            }
+            _ => Some(value),
         }
     }
 
@@ -1269,13 +1377,11 @@ impl<'a> Codegen<'a> {
         }
     }
 
-    fn assign(&mut self, ty: Type, right: Loc, left: Loc) -> Option<Value> {
+    fn assign_opaque(&mut self, size: u64, right: Loc, left: Loc) -> Option<Value> {
         if left == right {
             return Some(Value::VOID);
         }
 
-        let size = self.size_of(ty);
-
         match size {
             0 => {}
             ..=8 => {
@@ -1309,6 +1415,10 @@ impl<'a> Codegen<'a> {
         Some(Value::VOID)
     }
 
+    fn assign(&mut self, ty: Type, right: Loc, left: Loc) -> Option<Value> {
+        self.assign_opaque(self.size_of(ty), right, left)
+    }
+
     fn to_ptr(&mut self, loc: Loc) -> LinReg {
         match loc {
             Loc::Deref(reg, .., off) => {
@@ -1521,6 +1631,44 @@ impl<'a> Codegen<'a> {
         println!("{}:{}:{}: {}", self.path, line, col, msg);
         unreachable!();
     }
+
+    fn alloc_ret_loc(&mut self, ret: Type, ctx: Ctx) -> Loc {
+        let size = self.size_of(ret);
+        match size {
+            0 => Loc::Imm(0),
+            ..=8 => Loc::RegRef(1),
+            ..=16 => match ctx {
+                Ctx::Dest(dest) => dest.loc,
+                _ => Loc::Stack(self.alloc_stack(size), 0),
+            },
+            ..=u64::MAX => {
+                let val = match ctx {
+                    Ctx::Dest(dest) => dest.loc,
+                    _ => Loc::Stack(self.alloc_stack(size), 0),
+                };
+                let (ptr, off) = val.ref_to_ptr();
+                self.code.encode(instrs::cp(1, ptr));
+                self.code.addi64(1, ptr, off);
+                val
+            }
+        }
+    }
+
+    fn post_process_ret_loc(&mut self, ty: Type, loc: &Loc) {
+        let size = self.size_of(ty);
+        match size {
+            0 => {}
+            ..=8 => {}
+            ..=16 => {
+                if let Loc::Stack(ref stack, off) = loc {
+                    self.store_stack(1, stack.offset + off, size as _);
+                } else {
+                    unreachable!()
+                }
+            }
+            ..=u64::MAX => {}
+        }
+    }
 }
 
 #[derive(Debug)]
@@ -1704,5 +1852,6 @@ mod tests {
         structs => include_str!("../examples/structs.hb");
         different_types => include_str!("../examples/different_types.hb");
         struct_operators => include_str!("../examples/struct_operators.hb");
+        directives => include_str!("../examples/directives.hb");
     }
 }

hblang/src/lexer.rs

@@ -83,6 +83,7 @@ gen_token_kind! {
         Number,
         Eof,
         Error,
+        Driective,
         #[keywords]
         Return   = b"return",
         If       = b"if",
@@ -195,7 +196,7 @@ impl<'a> Iterator for Lexer<'a> {
     fn next(&mut self) -> Option<Self::Item> {
         use TokenKind as T;
         loop {
-            let start = self.pos;
+            let mut start = self.pos;
             let kind = match self.advance()? {
                 b'\n' | b'\r' | b'\t' | b' ' => continue,
                 b'0'..=b'9' => {
@@ -204,13 +205,18 @@ impl<'a> Iterator for Lexer<'a> {
                     }
                     T::Number
                 }
-                b'a'..=b'z' | b'A'..=b'Z' | b'_' => {
+                c @ (b'a'..=b'z' | b'A'..=b'Z' | b'_' | b'@') => {
                     while let Some(b'a'..=b'z' | b'A'..=b'Z' | b'0'..=b'9' | b'_') = self.peek() {
                         self.advance();
                     }
 
-                    let ident = &self.bytes[start as usize..self.pos as usize];
-                    T::from_ident(ident)
+                    if c == b'@' {
+                        start += 1;
+                        T::Driective
+                    } else {
+                        let ident = &self.bytes[start as usize..self.pos as usize];
+                        T::from_ident(ident)
+                    }
                 }
                 b':' if self.advance_if(b'=') => T::Decl,
                 b':' => T::Colon,

hblang/src/parser.rs

@@ -153,6 +153,14 @@ impl<'a, 'b> Parser<'a, 'b> {
         let frame = self.idents.len();
         let token = self.next();
         let mut expr = match token.kind {
+            T::Driective => E::Directive {
+                pos:  token.start,
+                name: self.lexer.slice(token.range()),
+                args: {
+                    self.expect_advance(T::LParen);
+                    self.collect_list(T::Comma, T::RParen, Self::expr)
+                },
+            },
             T::True => E::Bool {
                 pos:   token.start,
                 value: true,
@@ -428,6 +436,11 @@ pub enum Expr<'a> {
         pos:   Pos,
         value: bool,
     },
+    Directive {
+        pos:  u32,
+        name: &'a str,
+        args: &'a [Self],
+    },
 }
 
 impl<'a> Expr<'a> {
@@ -436,6 +449,7 @@ impl<'a> Expr<'a> {
             Self::Call { func, .. } => func.pos(),
             Self::Ident { id, .. } => ident::pos(*id),
             Self::Break { pos }
+            | Self::Directive { pos, .. }
             | Self::Continue { pos }
             | Self::Closure { pos, .. }
             | Self::Block { pos, .. }
@@ -459,18 +473,31 @@ impl<'a> std::fmt::Display for Expr<'a> {
             static INDENT: Cell<usize> = Cell::new(0);
         }
 
+        fn fmt_list<'a, T>(
+            f: &mut std::fmt::Formatter,
+            end: &str,
+            list: &'a [T],
+            fmt: impl Fn(&T, &mut std::fmt::Formatter) -> std::fmt::Result,
+        ) -> std::fmt::Result {
+            let first = &mut true;
+            for expr in list {
+                if !std::mem::take(first) {
+                    write!(f, ", ")?;
+                }
+                fmt(expr, f)?;
+            }
+            write!(f, "{end}")
+        }
+
         match *self {
-            Self::Field { target, field } => write!(f, "{}.{}", target, field),
+            Self::Field { target, field } => write!(f, "{target}.{field}"),
+            Self::Directive { name, args, .. } => {
+                write!(f, "@{name}(")?;
+                fmt_list(f, ")", args, std::fmt::Display::fmt)
+            }
             Self::Struct { fields, .. } => {
                 write!(f, "struct {{")?;
-                let first = &mut true;
-                for (name, ty) in fields {
-                    if !std::mem::take(first) {
-                        write!(f, ", ")?;
-                    }
-                    write!(f, "{}: {}", name, ty)?;
-                }
-                write!(f, "}}")
+                fmt_list(f, "}", fields, |(name, val), f| write!(f, "{name}: {val}",))
             }
             Self::Ctor { ty, fields, .. } => {
                 let (left, rith) = if fields.iter().any(|(name, _)| name.is_some()) {
@@ -482,7 +509,7 @@ impl<'a> std::fmt::Display for Expr<'a> {
                 if let Some(ty) = ty {
                     write!(f, "{ty}")?;
                 }
-                write!(f, ".{}", left)?;
+                write!(f, ".{left}")?;
                 let first = &mut true;
                 for (name, val) in fields {
                     if !std::mem::take(first) {
@@ -495,46 +522,33 @@ impl<'a> std::fmt::Display for Expr<'a> {
                 }
                 write!(f, "{rith}")
             }
-            Self::UnOp { op, val, .. } => write!(f, "{}{}", op, val),
+            Self::UnOp { op, val, .. } => write!(f, "{op}{val}"),
             Self::Break { .. } => write!(f, "break;"),
             Self::Continue { .. } => write!(f, "continue;"),
             Self::If {
                 cond, then, else_, ..
             } => {
-                write!(f, "if {} {}", cond, then)?;
+                write!(f, "if {cond} {then}")?;
                 if let Some(else_) = else_ {
-                    write!(f, " else {}", else_)?;
+                    write!(f, " else {else_}")?;
                 }
                 Ok(())
             }
-            Self::Loop { body, .. } => write!(f, "loop {}", body),
+            Self::Loop { body, .. } => write!(f, "loop {body}"),
             Self::Closure {
                 ret, body, args, ..
             } => {
-                write!(f, "|")?;
-                let first = &mut true;
-                for arg in args {
-                    if !std::mem::take(first) {
-                        write!(f, ", ")?;
-                    }
-                    write!(f, "{}: {}", arg.name, arg.ty)?;
-                }
-                write!(f, "|: {} {}", ret, body)
+                write!(f, "fn(")?;
+                fmt_list(f, "", args, |arg, f| write!(f, "{}: {}", arg.name, arg.ty))?;
+                write!(f, "): {ret} {body}")
             }
             Self::Call { func, args } => {
-                write!(f, "{}(", func)?;
-                let first = &mut true;
-                for arg in args {
-                    if !std::mem::take(first) {
-                        write!(f, ", ")?;
-                    }
-                    write!(f, "{}", arg)?;
-                }
-                write!(f, ")")
+                write!(f, "{func}(")?;
+                fmt_list(f, ")", args, std::fmt::Display::fmt)
             }
-            Self::Return { val: Some(val), .. } => write!(f, "return {};", val),
+            Self::Return { val: Some(val), .. } => write!(f, "return {val};"),
             Self::Return { val: None, .. } => write!(f, "return;"),
-            Self::Ident { name, .. } => write!(f, "{}", name),
+            Self::Ident { name, .. } => write!(f, "{name}"),
             Self::Block { stmts, .. } => {
                 writeln!(f, "{{")?;
                 INDENT.with(|i| i.set(i.get() + 1));
@@ -543,7 +557,7 @@ impl<'a> std::fmt::Display for Expr<'a> {
                         for _ in 0..INDENT.with(|i| i.get()) {
                             write!(f, "    ")?;
                         }
-                        writeln!(f, "{}", stmt)?;
+                        writeln!(f, "{stmt}")?;
                     }
                     Ok(())
                 })();
@@ -551,21 +565,21 @@ impl<'a> std::fmt::Display for Expr<'a> {
                 write!(f, "}}")?;
                 res
             }
-            Self::Number { value, .. } => write!(f, "{}", value),
-            Self::Bool { value, .. } => write!(f, "{}", value),
+            Self::Number { value, .. } => write!(f, "{value}"),
+            Self::Bool { value, .. } => write!(f, "{value}"),
             Self::BinOp { left, right, op } => {
                 let display_branch = |f: &mut std::fmt::Formatter, expr: &Self| {
                     if let Self::BinOp { op: lop, .. } = expr
                         && op.precedence() > lop.precedence()
                     {
-                        write!(f, "({})", expr)
+                        write!(f, "({expr})")
                     } else {
-                        write!(f, "{}", expr)
+                        write!(f, "{expr}")
                     }
                 };
 
                 display_branch(f, left)?;
-                write!(f, " {} ", op)?;
+                write!(f, " {op} ")?;
                 display_branch(f, right)
             }
         }

hblang/tests/codegen_tests_directives.txt

@@ -0,0 +1,4 @@
+ev: Ecall
+code size: 217
+ret: 0
+status: Ok(())

hblang/tests/parser_tests_arithmetic.txt

@@ -1,3 +1,3 @@
-main := ||: int {
+main := fn(): int {
     return 10 - 20 / 2 + 4 * (2 + 2) - 4 * 4 + 1;
 }

hblang/tests/parser_tests_example.txt

@@ -1,3 +1,3 @@
-main := ||: int {
+main := fn(): int {
     return 1;
 }