From 517850f283fb50ec24232b9dabd1b7c58448b2da Mon Sep 17 00:00:00 2001
From: Jakub Doka <jakub.doka2@gmail.com>
Date: Fri, 25 Oct 2024 22:59:01 +0200
Subject: [PATCH] fixing undescriptive error or not enough arguments

---
 depell/wasm-fmt/src/lib.rs |   2 +-
 depell/wasm-hbc/src/lib.rs |   2 +-
 lang/README.md             |   4 +-
 lang/src/codegen.rs        |  12 +-
 lang/src/fmt.rs            |   5 +-
 lang/src/fs.rs             |  34 +++-
 lang/src/lexer.rs          |  22 +-
 lang/src/lib.rs            |  64 +++++-
 lang/src/parser.rs         | 311 +++++++++++++++++-----------
 lang/src/son.rs            | 401 ++++++++++++++++++++++++-------------
 10 files changed, 575 insertions(+), 282 deletions(-)

diff --git a/depell/wasm-fmt/src/lib.rs b/depell/wasm-fmt/src/lib.rs
index 76a25b8..f39e8bd 100644
--- a/depell/wasm-fmt/src/lib.rs
+++ b/depell/wasm-fmt/src/lib.rs
@@ -19,7 +19,7 @@ unsafe extern "C" fn fmt() {
     let code = core::str::from_raw_parts(core::ptr::addr_of!(INPUT).cast(), INPUT_LEN);
 
     let arena = parser::Arena::with_capacity(code.len() * parser::SOURCE_TO_AST_FACTOR);
-    let mut ctx = parser::ParserCtx::default();
+    let mut ctx = parser::Ctx::default();
     let exprs = parser::Parser::parse(&mut ctx, code, "source.hb", &mut parser::no_loader, &arena);
 
     let mut f = wasm_rt::Write(&mut OUTPUT[..]);
diff --git a/depell/wasm-hbc/src/lib.rs b/depell/wasm-hbc/src/lib.rs
index b91df31..bbcb354 100644
--- a/depell/wasm-hbc/src/lib.rs
+++ b/depell/wasm-hbc/src/lib.rs
@@ -53,7 +53,7 @@ unsafe fn compile_and_run(mut fuel: usize) {
     };
 
     let files = {
-        let mut ctx = hblang::parser::ParserCtx::default();
+        let mut ctx = hblang::parser::Ctx::default();
         let paths = files.iter().map(|f| f.path).collect::<Vec<_>>();
         let mut loader = |path: &str, _: &str, kind| match kind {
             hblang::parser::FileKind::Module => Ok(paths.binary_search(&path).unwrap() as FileId),
diff --git a/lang/README.md b/lang/README.md
index 038f065..efc7e4b 100644
--- a/lang/README.md
+++ b/lang/README.md
@@ -728,7 +728,9 @@ sqrt := fn(x: uint): uint {
 	g := 0
 	b := 32768
 	bshift := 15
-	loop if b == 0 break else {
+	loop if b == 0 {
+		break
+	} else {
 		bshift -= 1
 		temp = b + (g << 1)
 		temp <<= bshift
diff --git a/lang/src/codegen.rs b/lang/src/codegen.rs
index bbca41f..42054c3 100644
--- a/lang/src/codegen.rs
+++ b/lang/src/codegen.rs
@@ -2649,13 +2649,21 @@ impl Codegen {
 
 #[cfg(test)]
 mod tests {
-    use alloc::{string::String, vec::Vec};
+    use {
+        crate::parser,
+        alloc::{string::String, vec::Vec},
+    };
 
     fn generate(ident: &'static str, input: &'static str, output: &mut String) {
         _ = log::set_logger(&crate::fs::Logger);
         log::set_max_level(log::LevelFilter::Debug);
 
-        let (files, embeds) = crate::test_parse_files(ident, input);
+        let mut ctx = parser::Ctx::default();
+        let (files, embeds) = crate::test_parse_files(ident, input, &mut ctx);
+        if !ctx.errors.get_mut().is_empty() {
+            output.push_str(ctx.errors.get_mut());
+            return;
+        }
         let mut codegen = super::Codegen { files, ..Default::default() };
         codegen.push_embeds(embeds);
 
diff --git a/lang/src/fmt.rs b/lang/src/fmt.rs
index 54c3f4f..e3db5dc 100644
--- a/lang/src/fmt.rs
+++ b/lang/src/fmt.rs
@@ -451,7 +451,7 @@ pub fn fmt_file(exprs: &[Expr], file: &str, f: &mut impl fmt::Write) -> fmt::Res
 #[cfg(test)]
 pub mod test {
     use {
-        crate::parser::{self, ParserCtx},
+        crate::parser::{self, Ctx},
         alloc::borrow::ToOwned,
         std::{fmt::Write, string::String},
     };
@@ -461,8 +461,7 @@ pub mod test {
         let len = crate::fmt::minify(&mut minned);
         minned.truncate(len);
 
-        let ast =
-            parser::Ast::new(ident, minned, &mut ParserCtx::default(), &mut parser::no_loader);
+        let ast = parser::Ast::new(ident, minned, &mut Ctx::default(), &mut parser::no_loader);
         //log::error!(
         //    "{} / {} = {} | {} / {} = {}",
         //    ast.mem.size(),
diff --git a/lang/src/fs.rs b/lang/src/fs.rs
index d022e37..0c8a7f2 100644
--- a/lang/src/fs.rs
+++ b/lang/src/fs.rs
@@ -1,7 +1,7 @@
 use {
     crate::{
         codegen,
-        parser::{self, Ast, FileKind, ParserCtx},
+        parser::{self, Ast, Ctx, FileKind},
         son,
     },
     alloc::{string::String, vec::Vec},
@@ -89,10 +89,11 @@ pub fn run_compiler(root_file: &str, options: Options, out: &mut Vec<u8>) -> std
         let ast = parsed.ast.into_iter().next().unwrap();
         write!(out, "{ast}").unwrap();
     } else if options.optimize {
-        let mut codegen = son::Codegen::default();
-        codegen.files = &parsed.ast;
-        codegen.push_embeds(parsed.embeds);
+        let mut ctx = crate::son::CodegenCtx::default();
+        *ctx.parser.errors.get_mut() = parsed.errors;
+        let mut codegen = son::Codegen::new(&parsed.ast, &mut ctx);
 
+        codegen.push_embeds(parsed.embeds);
         codegen.generate(0);
 
         if !codegen.errors.borrow().is_empty() {
@@ -108,6 +109,11 @@ pub fn run_compiler(root_file: &str, options: Options, out: &mut Vec<u8>) -> std
             codegen.assemble(out);
         }
     } else {
+        if !parsed.errors.is_empty() {
+            log::error!("{}", parsed.errors);
+            return Err(std::io::Error::other("parsing failed"));
+        }
+
         let mut codegen = codegen::Codegen::default();
         codegen.files = parsed.ast;
         codegen.push_embeds(parsed.embeds);
@@ -213,6 +219,7 @@ impl<T> TaskQueueInner<T> {
 pub struct Loaded {
     ast: Vec<Ast>,
     embeds: Vec<Vec<u8>>,
+    errors: String,
 }
 
 pub fn parse_from_fs(extra_threads: usize, root: &str) -> io::Result<Loaded> {
@@ -334,7 +341,7 @@ pub fn parse_from_fs(extra_threads: usize, root: &str) -> io::Result<Loaded> {
     };
 
     let thread = || {
-        let mut ctx = ParserCtx::default();
+        let mut ctx = Ctx::default();
         let mut tmp = PathBuf::new();
         while let Some(task @ (indx, ..)) = tasks.pop() {
             let res = execute_task(&mut ctx, task, &mut tmp);
@@ -343,6 +350,7 @@ pub fn parse_from_fs(extra_threads: usize, root: &str) -> io::Result<Loaded> {
             ast.resize_with(len, || Err(io::ErrorKind::InvalidData.into()));
             ast[indx as usize] = res;
         }
+        ctx.errors.into_inner()
     };
 
     let path = Path::new(root).canonicalize().map_err(|e| {
@@ -351,15 +359,23 @@ pub fn parse_from_fs(extra_threads: usize, root: &str) -> io::Result<Loaded> {
     seen_modules.lock().unwrap().insert(path.clone(), 0);
     tasks.push((0, path));
 
-    if extra_threads == 0 {
-        thread();
+    let errors = if extra_threads == 0 {
+        thread()
     } else {
-        std::thread::scope(|s| (0..extra_threads + 1).for_each(|_| _ = s.spawn(thread)));
-    }
+        std::thread::scope(|s| {
+            (0..extra_threads + 1)
+                .map(|_| s.spawn(thread))
+                .collect::<Vec<_>>()
+                .into_iter()
+                .map(|t| t.join().unwrap())
+                .collect::<String>()
+        })
+    };
 
     Ok(Loaded {
         ast: ast.into_inner().unwrap().into_iter().collect::<io::Result<Vec<_>>>()?,
         embeds: embeds.into_inner().unwrap(),
+        errors,
     })
 }
 
diff --git a/lang/src/lexer.rs b/lang/src/lexer.rs
index 8bf1460..1fbff44 100644
--- a/lang/src/lexer.rs
+++ b/lang/src/lexer.rs
@@ -51,6 +51,8 @@ macro_rules! gen_token_kind {
         }
 
         impl $name {
+            pub const OPS: &[Self] = &[$($(Self::$op),*),*];
+
             pub fn name(&self) -> &str {
                 let sf = unsafe { &*(self as *const _ as *const u8) } ;
                 match *self {
@@ -279,11 +281,16 @@ impl TokenKind {
             Self::Shl => a.wrapping_shl(b as _),
             Self::Eq => (a == b) as i64,
             Self::Ne => (a != b) as i64,
+            Self::Lt => (a < b) as i64,
+            Self::Gt => (a > b) as i64,
+            Self::Le => (a >= b) as i64,
+            Self::Ge => (a <= b) as i64,
             Self::Band => a & b,
             Self::Bor => a | b,
             Self::Xor => a ^ b,
-            Self::Mod => a % b,
-            Self::Shr => a >> b,
+            Self::Mod if b == 0 => 0,
+            Self::Mod => a.wrapping_rem(b),
+            Self::Shr => a.wrapping_shr(b as _),
             s => todo!("{s}"),
         }
     }
@@ -316,6 +323,17 @@ impl TokenKind {
             s => todo!("{s}"),
         }
     }
+
+    pub fn closing(&self) -> Option<TokenKind> {
+        Some(match self {
+            Self::Ctor => Self::RBrace,
+            Self::Tupl => Self::RParen,
+            Self::LParen => Self::RParen,
+            Self::LBrack => Self::RBrack,
+            Self::LBrace => Self::RBrace,
+            _ => return None,
+        })
+    }
 }
 
 gen_token_kind! {
diff --git a/lang/src/lib.rs b/lang/src/lib.rs
index e0dc1d1..560ba31 100644
--- a/lang/src/lib.rs
+++ b/lang/src/lib.rs
@@ -930,6 +930,11 @@ impl IdentInterner {
     fn project(&self, ident: &str) -> Option<Ident> {
         self.lookup.get(ident, &self.strings).copied()
     }
+
+    fn clear(&mut self) {
+        self.lookup.clear();
+        self.strings.clear()
+    }
 }
 
 #[derive(Default)]
@@ -946,20 +951,36 @@ pub struct TypeIns {
     funcs: Vec<Func>,
     args: Vec<ty::Id>,
     globals: Vec<Global>,
-    // TODO: use ctx map
-    strings: HashMap<Vec<u8>, ty::Global>,
     structs: Vec<Struct>,
     fields: Vec<Field>,
     ptrs: Vec<Ptr>,
     slices: Vec<Array>,
 }
 
+struct FTask {
+    file: FileId,
+    id: ty::Func,
+}
+
+struct StringRef(ty::Global);
+
+impl ctx_map::CtxEntry for StringRef {
+    type Ctx = [Global];
+    type Key<'a> = &'a [u8];
+
+    fn key<'a>(&self, ctx: &'a Self::Ctx) -> Self::Key<'a> {
+        &ctx[self.0 as usize].data
+    }
+}
+
 #[derive(Default)]
 struct Types {
     syms: ctx_map::CtxMap<ty::Id>,
     names: IdentInterner,
+    strings: ctx_map::CtxMap<StringRef>,
     ins: TypeIns,
     tmp: TypesTmp,
+    tasks: Vec<Option<FTask>>,
 }
 
 const HEADER_SIZE: usize = core::mem::size_of::<AbleOsExecutableHeader>();
@@ -1444,6 +1465,28 @@ impl Types {
         let name = self.names.project(name)?;
         self.struct_fields(s).iter().position(|f| f.name == name)
     }
+
+    fn clear(&mut self) {
+        self.syms.clear();
+        self.names.clear();
+        self.strings.clear();
+
+        self.ins.funcs.clear();
+        self.ins.args.clear();
+        self.ins.globals.clear();
+        self.ins.structs.clear();
+        self.ins.fields.clear();
+        self.ins.ptrs.clear();
+        self.ins.slices.clear();
+
+        debug_assert_eq!(self.tmp.fields.len(), 0);
+        debug_assert_eq!(self.tmp.frontier.len(), 0);
+        debug_assert_eq!(self.tmp.globals.len(), 0);
+        debug_assert_eq!(self.tmp.funcs.len(), 0);
+        debug_assert_eq!(self.tmp.args.len(), 0);
+
+        debug_assert_eq!(self.tasks.len(), 0);
+    }
 }
 
 struct OffsetIter {
@@ -1559,6 +1602,10 @@ impl Comptime {
     fn pop_pc(&mut self, prev_pc: hbvm::mem::Address) {
         self.vm.pc = prev_pc + self.code.as_ptr() as usize;
     }
+
+    fn clear(&mut self) {
+        self.code.clear();
+    }
 }
 
 impl Default for Comptime {
@@ -1641,13 +1688,17 @@ pub fn run_test(
 }
 
 #[cfg(test)]
-fn test_parse_files(ident: &'static str, input: &'static str) -> (Vec<parser::Ast>, Vec<Vec<u8>>) {
+fn test_parse_files(
+    ident: &str,
+    input: &str,
+    ctx: &mut parser::Ctx,
+) -> (Vec<parser::Ast>, Vec<Vec<u8>>) {
     use {
         self::parser::FileKind,
         std::{borrow::ToOwned, string::ToString},
     };
 
-    fn find_block(mut input: &'static str, test_name: &'static str) -> &'static str {
+    fn find_block<'a>(mut input: &'a str, test_name: &str) -> &'a str {
         const CASE_PREFIX: &str = "#### ";
         const CASE_SUFFIX: &str = "\n```hb";
         loop {
@@ -1707,13 +1758,10 @@ fn test_parse_files(ident: &'static str, input: &'static str) -> (Vec<parser::As
             .ok_or("Embed Not Found".to_string()),
     };
 
-    let mut ctx = parser::ParserCtx::default();
     (
         module_map
             .iter()
-            .map(|&(path, content)| {
-                parser::Ast::new(path, content.to_owned(), &mut ctx, &mut loader)
-            })
+            .map(|&(path, content)| parser::Ast::new(path, content.to_owned(), ctx, &mut loader))
             .collect(),
         embed_map.iter().map(|&(_, content)| content.to_owned().into_bytes()).collect(),
     )
diff --git a/lang/src/parser.rs b/lang/src/parser.rs
index de3b1d5..3946dd1 100644
--- a/lang/src/parser.rs
+++ b/lang/src/parser.rs
@@ -7,7 +7,7 @@ use {
     alloc::{boxed::Box, string::String, vec::Vec},
     core::{
         alloc::Layout,
-        cell::UnsafeCell,
+        cell::{RefCell, UnsafeCell},
         fmt::{self},
         intrinsics::unlikely,
         marker::PhantomData,
@@ -19,7 +19,6 @@ use {
 
 pub type Pos = u32;
 pub type IdentFlags = u32;
-pub type Symbols = Vec<Symbol>;
 pub type FileId = u32;
 pub type IdentIndex = u16;
 pub type LoaderError = String;
@@ -31,6 +30,20 @@ pub enum FileKind {
     Embed,
 }
 
+trait Trans {
+    fn trans(self) -> Self;
+}
+
+impl<T> Trans for Option<Option<T>> {
+    fn trans(self) -> Self {
+        match self {
+            Some(None) => None,
+            Some(Some(v)) => Some(Some(v)),
+            None => Some(None),
+        }
+    }
+}
+
 pub const SOURCE_TO_AST_FACTOR: usize = 7 * (core::mem::size_of::<usize>() / 4) + 1;
 
 pub mod idfl {
@@ -73,7 +86,7 @@ pub struct Parser<'a, 'b> {
     loader: Loader<'b>,
     lexer: Lexer<'a>,
     arena: &'a Arena,
-    ctx: &'b mut ParserCtx,
+    ctx: &'b mut Ctx,
     token: Token,
     ns_bound: usize,
     trailing_sep: bool,
@@ -82,7 +95,7 @@ pub struct Parser<'a, 'b> {
 
 impl<'a, 'b> Parser<'a, 'b> {
     pub fn parse(
-        ctx: &'b mut ParserCtx,
+        ctx: &'b mut Ctx,
         input: &'a str,
         path: &'b str,
         loader: Loader<'b>,
@@ -110,23 +123,17 @@ impl<'a, 'b> Parser<'a, 'b> {
 
         if !self.ctx.idents.is_empty() {
             // TODO: we need error recovery
-            log::error!("{}", {
-                let mut errors = String::new();
-                for id in self.ctx.idents.drain(..) {
-                    report_to(
-                        self.lexer.source(),
-                        self.path,
-                        ident::pos(id.ident),
-                        &format_args!(
-                            "undeclared identifier: {}",
-                            self.lexer.slice(ident::range(id.ident))
-                        ),
-                        &mut errors,
-                    );
-                }
-                errors
-            });
-            unreachable!();
+            let mut idents = core::mem::take(&mut self.ctx.idents);
+            for id in idents.drain(..) {
+                self.report(
+                    ident::pos(id.ident),
+                    format_args!(
+                        "undeclared identifier: {}",
+                        self.lexer.slice(ident::range(id.ident))
+                    ),
+                );
+            }
+            self.ctx.idents = idents;
         }
 
         f
@@ -136,20 +143,20 @@ impl<'a, 'b> Parser<'a, 'b> {
         core::mem::replace(&mut self.token, self.lexer.eat())
     }
 
-    fn ptr_expr(&mut self) -> &'a Expr<'a> {
-        self.arena.alloc(self.expr())
+    fn ptr_expr(&mut self) -> Option<&'a Expr<'a>> {
+        Some(self.arena.alloc(self.expr()?))
     }
 
-    fn expr_low(&mut self, top_level: bool) -> Expr<'a> {
-        let left = self.unit_expr();
+    fn expr_low(&mut self, top_level: bool) -> Option<Expr<'a>> {
+        let left = self.unit_expr()?;
         self.bin_expr(left, 0, top_level)
     }
 
-    fn expr(&mut self) -> Expr<'a> {
+    fn expr(&mut self) -> Option<Expr<'a>> {
         self.expr_low(false)
     }
 
-    fn bin_expr(&mut self, mut fold: Expr<'a>, min_prec: u8, top_level: bool) -> Expr<'a> {
+    fn bin_expr(&mut self, mut fold: Expr<'a>, min_prec: u8, top_level: bool) -> Option<Expr<'a>> {
         loop {
             let Some(prec) = self.token.kind.precedence() else {
                 break;
@@ -165,8 +172,8 @@ impl<'a, 'b> Parser<'a, 'b> {
                 self.declare_rec(&fold, top_level);
             }
 
-            let right = self.unit_expr();
-            let right = self.bin_expr(right, prec, false);
+            let right = self.unit_expr()?;
+            let right = self.bin_expr(right, prec, false)?;
             let right = self.arena.alloc(right);
             let left = self.arena.alloc(fold);
 
@@ -187,7 +194,7 @@ impl<'a, 'b> Parser<'a, 'b> {
             }
         }
 
-        fold
+        Some(fold)
     }
 
     fn declare_rec(&mut self, expr: &Expr, top_level: bool) {
@@ -200,7 +207,7 @@ impl<'a, 'b> Parser<'a, 'b> {
                     self.declare_rec(value, top_level)
                 }
             }
-            _ => self.report(expr.pos(), "cant declare this shit (yet)"),
+            _ => _ = self.report(expr.pos(), "cant declare this shit (yet)"),
         }
     }
 
@@ -217,12 +224,14 @@ impl<'a, 'b> Parser<'a, 'b> {
 
         let Ok(index) = self.ctx.idents.binary_search_by_key(&id, |s| s.ident) else {
             self.report(pos, "the identifier is rezerved for a builtin (proably)");
+            return;
         };
         if core::mem::replace(&mut self.ctx.idents[index].declared, true) {
             self.report(
                 pos,
                 format_args!("redeclaration of identifier: {}", self.lexer.slice(ident::range(id))),
-            )
+            );
+            return;
         }
 
         self.ctx.idents[index].ordered = ordered;
@@ -245,11 +254,16 @@ impl<'a, 'b> Parser<'a, 'b> {
         {
             Some((i, elem)) => (i, elem, false),
             None => {
-                let Some(id) = ident::new(token.start, name.len() as _) else {
-                    self.report(token.start, "identifier can at most have 64 characters");
+                let ident = match ident::new(token.start, name.len() as _) {
+                    None => {
+                        self.report(token.start, "identifier can at most have 64 characters");
+                        ident::new(token.start, 64).unwrap()
+                    }
+                    Some(id) => id,
                 };
+
                 self.ctx.idents.push(ScopeIdent {
-                    ident: id,
+                    ident,
                     declared: false,
                     ordered: false,
                     flags: 0,
@@ -271,18 +285,18 @@ impl<'a, 'b> Parser<'a, 'b> {
         self.lexer.slice(range.range())
     }
 
-    fn unit_expr(&mut self) -> Expr<'a> {
+    fn unit_expr(&mut self) -> Option<Expr<'a>> {
         use {Expr as E, TokenKind as T};
         let frame = self.ctx.idents.len();
         let token @ Token { start: pos, .. } = self.next();
         let prev_boundary = self.ns_bound;
         let prev_captured = self.ctx.captured.len();
         let mut expr = match token.kind {
-            T::Ct => E::Ct { pos, value: self.ptr_expr() },
+            T::Ct => E::Ct { pos, value: self.ptr_expr()? },
             T::Directive if self.lexer.slice(token.range()) == "use" => {
-                self.expect_advance(TokenKind::LParen);
-                let str = self.expect_advance(TokenKind::DQuote);
-                self.expect_advance(TokenKind::RParen);
+                self.expect_advance(TokenKind::LParen)?;
+                let str = self.expect_advance(TokenKind::DQuote)?;
+                self.expect_advance(TokenKind::RParen)?;
                 let path = self.lexer.slice(str.range());
                 let path = &path[1..path.len() - 1];
 
@@ -292,15 +306,15 @@ impl<'a, 'b> Parser<'a, 'b> {
                     id: match (self.loader)(path, self.path, FileKind::Module) {
                         Ok(id) => id,
                         Err(e) => {
-                            self.report(str.start, format_args!("error loading dependency: {e:#}"))
+                            self.report(str.start, format_args!("error loading dependency: {e:#}"))?
                         }
                     },
                 }
             }
             T::Directive if self.lexer.slice(token.range()) == "embed" => {
-                self.expect_advance(TokenKind::LParen);
-                let str = self.expect_advance(TokenKind::DQuote);
-                self.expect_advance(TokenKind::RParen);
+                self.expect_advance(TokenKind::LParen)?;
+                let str = self.expect_advance(TokenKind::DQuote)?;
+                self.expect_advance(TokenKind::RParen)?;
                 let path = self.lexer.slice(str.range());
                 let path = &path[1..path.len() - 1];
 
@@ -309,8 +323,10 @@ impl<'a, 'b> Parser<'a, 'b> {
                     path,
                     id: match (self.loader)(path, self.path, FileKind::Embed) {
                         Ok(id) => id,
-                        Err(e) => self
-                            .report(str.start, format_args!("error loading embedded file: {e:#}")),
+                        Err(e) => self.report(
+                            str.start,
+                            format_args!("error loading embedded file: {e:#}"),
+                        )?,
                     },
                 }
             }
@@ -318,7 +334,7 @@ impl<'a, 'b> Parser<'a, 'b> {
                 pos: pos - 1, // need to undo the directive shift
                 name: self.tok_str(token),
                 args: {
-                    self.expect_advance(T::LParen);
+                    self.expect_advance(T::LParen)?;
                     self.collect_list(T::Comma, T::RParen, Self::expr)
                 },
             },
@@ -328,7 +344,7 @@ impl<'a, 'b> Parser<'a, 'b> {
             T::DQuote => E::String { pos, literal: self.tok_str(token) },
             T::Packed => {
                 self.packed = true;
-                let expr = self.unit_expr();
+                let expr = self.unit_expr()?;
                 if self.packed {
                     self.report(
                         expr.pos(),
@@ -342,20 +358,20 @@ impl<'a, 'b> Parser<'a, 'b> {
                 packed: core::mem::take(&mut self.packed),
                 fields: {
                     self.ns_bound = self.ctx.idents.len();
-                    self.expect_advance(T::LBrace);
+                    self.expect_advance(T::LBrace)?;
                     self.collect_list(T::Comma, T::RBrace, |s| {
                         let tok = s.token;
-                        if s.advance_if(T::Comment) {
+                        Some(if s.advance_if(T::Comment) {
                             CommentOr::Comment { literal: s.tok_str(tok), pos: tok.start }
                         } else {
-                            let name = s.expect_advance(T::Ident);
-                            s.expect_advance(T::Colon);
+                            let name = s.expect_advance(T::Ident)?;
+                            s.expect_advance(T::Colon)?;
                             CommentOr::Or(StructField {
                                 pos: name.start,
                                 name: s.tok_str(name),
-                                ty: s.expr(),
+                                ty: s.expr()?,
                             })
-                        }
+                        })
                     })
                 },
                 captured: {
@@ -381,11 +397,11 @@ impl<'a, 'b> Parser<'a, 'b> {
             }
             T::If => E::If {
                 pos,
-                cond: self.ptr_expr(),
-                then: self.ptr_expr(),
-                else_: self.advance_if(T::Else).then(|| self.ptr_expr()),
+                cond: self.ptr_expr()?,
+                then: self.ptr_expr()?,
+                else_: self.advance_if(T::Else).then(|| self.ptr_expr()).trans()?,
             },
-            T::Loop => E::Loop { pos, body: self.ptr_expr() },
+            T::Loop => E::Loop { pos, body: self.ptr_expr()? },
             T::Break => E::Break { pos },
             T::Continue => E::Continue { pos },
             T::Return => E::Return {
@@ -394,39 +410,40 @@ impl<'a, 'b> Parser<'a, 'b> {
                     self.token.kind,
                     T::Semi | T::RBrace | T::RBrack | T::RParen | T::Comma
                 ))
-                .then(|| self.ptr_expr()),
+                .then(|| self.ptr_expr())
+                .trans()?,
             },
             T::Fn => E::Closure {
                 pos,
                 args: {
-                    self.expect_advance(T::LParen);
+                    self.expect_advance(T::LParen)?;
                     self.collect_list(T::Comma, T::RParen, |s| {
-                        let name = s.advance_ident();
+                        let name = s.advance_ident()?;
                         let (id, _) = s.resolve_ident(name);
                         s.declare(name.start, id, true, true);
-                        s.expect_advance(T::Colon);
-                        Arg {
+                        s.expect_advance(T::Colon)?;
+                        Some(Arg {
                             pos: name.start,
                             name: s.tok_str(name),
                             is_ct: name.kind == T::CtIdent,
                             id,
-                            ty: s.expr(),
-                        }
+                            ty: s.expr()?,
+                        })
                     })
                 },
                 ret: {
-                    self.expect_advance(T::Colon);
-                    self.ptr_expr()
+                    self.expect_advance(T::Colon)?;
+                    self.ptr_expr()?
                 },
-                body: self.ptr_expr(),
+                body: self.ptr_expr()?,
             },
             T::Ctor => self.ctor(pos, None),
             T::Tupl => self.tupl(pos, None),
             T::LBrack => E::Slice {
-                item: self.ptr_unit_expr(),
-                size: self.advance_if(T::Semi).then(|| self.ptr_expr()),
+                item: self.ptr_unit_expr()?,
+                size: self.advance_if(T::Semi).then(|| self.ptr_expr()).trans()?,
                 pos: {
-                    self.expect_advance(T::RBrack);
+                    self.expect_advance(T::RBrack)?;
                     pos
                 },
             },
@@ -434,7 +451,7 @@ impl<'a, 'b> Parser<'a, 'b> {
                 pos,
                 op: token.kind,
                 val: {
-                    let expr = self.ptr_unit_expr();
+                    let expr = self.ptr_unit_expr()?;
                     if token.kind == T::Band {
                         self.flag_idents(*expr, idfl::REFERENCED);
                     }
@@ -454,18 +471,18 @@ impl<'a, 'b> Parser<'a, 'b> {
                     pos,
                     value: match u64::from_str_radix(slice, radix as u32) {
                         Ok(value) => value,
-                        Err(e) => self.report(token.start, format_args!("invalid number: {e}")),
+                        Err(e) => self.report(token.start, format_args!("invalid number: {e}"))?,
                     } as i64,
                     radix,
                 }
             }
             T::LParen => {
-                let expr = self.expr();
-                self.expect_advance(T::RParen);
+                let expr = self.expr()?;
+                self.expect_advance(T::RParen)?;
                 expr
             }
             T::Comment => Expr::Comment { pos, literal: self.tok_str(token) },
-            tok => self.report(token.start, format_args!("unexpected token: {tok}")),
+            tok => self.report(token.start, format_args!("unexpected token: {tok}"))?,
         };
 
         loop {
@@ -485,8 +502,8 @@ impl<'a, 'b> Parser<'a, 'b> {
                 T::LBrack => E::Index {
                     base: self.arena.alloc(expr),
                     index: {
-                        let index = self.expr();
-                        self.expect_advance(T::RBrack);
+                        let index = self.expr()?;
+                        self.expect_advance(T::RBrack)?;
                         self.arena.alloc(index)
                     },
                 },
@@ -494,7 +511,7 @@ impl<'a, 'b> Parser<'a, 'b> {
                     target: self.arena.alloc(expr),
                     pos: token.start,
                     name: {
-                        let token = self.expect_advance(T::Ident);
+                        let token = self.expect_advance(T::Ident)?;
                         self.tok_str(token)
                     },
                 },
@@ -506,7 +523,7 @@ impl<'a, 'b> Parser<'a, 'b> {
             self.pop_scope(frame);
         }
 
-        expr
+        Some(expr)
     }
 
     fn tupl(&mut self, pos: Pos, ty: Option<Expr<'a>>) -> Expr<'a> {
@@ -523,31 +540,29 @@ impl<'a, 'b> Parser<'a, 'b> {
             pos,
             ty: ty.map(|ty| self.arena.alloc(ty)),
             fields: self.collect_list(TokenKind::Comma, TokenKind::RBrace, |s| {
-                let name_tok = s.advance_ident();
+                let name_tok = s.advance_ident()?;
                 let name = s.tok_str(name_tok);
-                CtorField {
+                Some(CtorField {
                     pos: name_tok.start,
                     name,
                     value: if s.advance_if(TokenKind::Colon) {
-                        s.expr()
+                        s.expr()?
                     } else {
                         let (id, is_first) = s.resolve_ident(name_tok);
                         Expr::Ident { pos: name_tok.start, is_ct: false, id, is_first }
                     },
-                }
+                })
             }),
             trailing_comma: core::mem::take(&mut self.trailing_sep),
         }
     }
 
-    fn advance_ident(&mut self) -> Token {
-        if matches!(self.token.kind, TokenKind::Ident | TokenKind::CtIdent) {
-            self.next()
+    fn advance_ident(&mut self) -> Option<Token> {
+        let next = self.next();
+        if matches!(next.kind, TokenKind::Ident | TokenKind::CtIdent) {
+            Some(next)
         } else {
-            self.report(
-                self.token.start,
-                format_args!("expected identifier, found {}", self.token.kind),
-            )
+            self.report(self.token.start, format_args!("expected identifier, found {}", next.kind))?
         }
     }
 
@@ -567,20 +582,49 @@ impl<'a, 'b> Parser<'a, 'b> {
             .collect_into(&mut self.ctx.symbols);
     }
 
-    fn ptr_unit_expr(&mut self) -> &'a Expr<'a> {
-        self.arena.alloc(self.unit_expr())
+    fn ptr_unit_expr(&mut self) -> Option<&'a Expr<'a>> {
+        Some(self.arena.alloc(self.unit_expr()?))
     }
 
     fn collect_list<T: Copy>(
         &mut self,
         delim: TokenKind,
         end: TokenKind,
-        mut f: impl FnMut(&mut Self) -> T,
+        mut f: impl FnMut(&mut Self) -> Option<T>,
     ) -> &'a [T] {
         let mut trailing_sep = false;
         let mut view = self.ctx.stack.view();
-        while !self.advance_if(end) {
-            let val = f(self);
+        'o: while !self.advance_if(end) {
+            let val = match f(self) {
+                Some(val) => val,
+                None => {
+                    let mut paren = None::<TokenKind>;
+                    let mut depth = 0;
+                    loop {
+                        let tok = self.next();
+                        if tok.kind == TokenKind::Eof {
+                            break 'o;
+                        }
+                        if let Some(par) = paren {
+                            if par == tok.kind {
+                                depth += 1;
+                            } else if tok.kind.closing() == par.closing() {
+                                depth -= 1;
+                                if depth == 0 {
+                                    paren = None;
+                                }
+                            }
+                        } else if tok.kind == delim {
+                            continue 'o;
+                        } else if tok.kind == end {
+                            break 'o;
+                        } else if tok.kind.closing().is_some() && paren.is_none() {
+                            paren = Some(tok.kind);
+                            depth = 1;
+                        }
+                    }
+                }
+            };
             trailing_sep = self.advance_if(delim);
             unsafe { self.ctx.stack.push(&mut view, val) };
         }
@@ -597,20 +641,28 @@ impl<'a, 'b> Parser<'a, 'b> {
         }
     }
 
-    fn expect_advance(&mut self, kind: TokenKind) -> Token {
-        if self.token.kind != kind {
-            self.report(
-                self.token.start,
-                format_args!("expected {}, found {}", kind, self.token.kind),
-            );
+    #[must_use]
+    fn expect_advance(&mut self, kind: TokenKind) -> Option<Token> {
+        let next = self.next();
+        if next.kind != kind {
+            self.report(next.start, format_args!("expected {}, found {}", kind, next.kind))?
+        } else {
+            Some(next)
         }
-        self.next()
     }
 
     #[track_caller]
-    fn report(&self, pos: Pos, msg: impl fmt::Display) -> ! {
-        log::error!("{}", Report::new(self.lexer.source(), self.path, pos, msg));
-        unreachable!();
+    fn report(&mut self, pos: Pos, msg: impl fmt::Display) -> Option<!> {
+        if log::log_enabled!(log::Level::Error) {
+            use core::fmt::Write;
+            writeln!(
+                self.ctx.errors.get_mut(),
+                "{}",
+                Report::new(self.lexer.source(), self.path, pos, msg)
+            )
+            .unwrap();
+        }
+        None
     }
 
     fn flag_idents(&mut self, e: Expr<'a>, flags: IdentFlags) {
@@ -988,13 +1040,25 @@ impl core::fmt::Display for Display<'_> {
 }
 
 #[derive(Default)]
-pub struct ParserCtx {
-    symbols: Symbols,
+pub struct Ctx {
+    pub errors: RefCell<String>,
+    symbols: Vec<Symbol>,
     stack: StackAlloc,
     idents: Vec<ScopeIdent>,
     captured: Vec<Ident>,
 }
 
+impl Ctx {
+    pub fn clear(&mut self) {
+        self.errors.get_mut().clear();
+
+        debug_assert_eq!(self.symbols.len(), 0);
+        debug_assert_eq!(self.stack.len, 0);
+        debug_assert_eq!(self.idents.len(), 0);
+        debug_assert_eq!(self.captured.len(), 0);
+    }
+}
+
 #[repr(C)]
 pub struct AstInner<T: ?Sized> {
     ref_count: AtomicUsize,
@@ -1014,12 +1078,12 @@ impl AstInner<[Symbol]> {
             .0
     }
 
-    fn new(file: Box<str>, path: &str, ctx: &mut ParserCtx, loader: Loader) -> NonNull<Self> {
+    fn new(file: Box<str>, path: Box<str>, ctx: &mut Ctx, loader: Loader) -> NonNull<Self> {
         let arena = Arena::with_capacity(
             SOURCE_TO_AST_FACTOR * file.bytes().filter(|b| !b.is_ascii_whitespace()).count(),
         );
         let exprs =
-            unsafe { core::mem::transmute(Parser::parse(ctx, &file, path, loader, &arena)) };
+            unsafe { core::mem::transmute(Parser::parse(ctx, &file, &path, loader, &arena)) };
 
         crate::quad_sort(&mut ctx.symbols, |a, b| a.name.cmp(&b.name));
 
@@ -1033,13 +1097,14 @@ impl AstInner<[Symbol]> {
                 ref_count: AtomicUsize::new(1),
                 mem: arena.chunk.into_inner(),
                 exprs,
-                path: path.into(),
+                path,
                 file,
                 symbols: (),
             });
             core::ptr::addr_of_mut!((*inner).symbols)
                 .as_mut_ptr()
                 .copy_from_nonoverlapping(ctx.symbols.as_ptr(), ctx.symbols.len());
+            ctx.symbols.clear();
 
             NonNull::new_unchecked(inner)
         }
@@ -1090,8 +1155,13 @@ fn report_to(file: &str, path: &str, pos: Pos, msg: &dyn fmt::Display, out: &mut
 pub struct Ast(NonNull<AstInner<[Symbol]>>);
 
 impl Ast {
-    pub fn new(path: &str, content: String, ctx: &mut ParserCtx, loader: Loader) -> Self {
-        Self(AstInner::new(content.into(), path, ctx, loader))
+    pub fn new(
+        path: impl Into<Box<str>>,
+        content: impl Into<Box<str>>,
+        ctx: &mut Ctx,
+        loader: Loader,
+    ) -> Self {
+        Self(AstInner::new(content.into(), path.into(), ctx, loader))
     }
 
     pub fn exprs(&self) -> &[Expr] {
@@ -1118,7 +1188,7 @@ impl Ast {
 
 impl Default for Ast {
     fn default() -> Self {
-        Self(AstInner::new("".into(), "", &mut ParserCtx::default(), &mut no_loader))
+        Self(AstInner::new("".into(), "".into(), &mut Ctx::default(), &mut no_loader))
     }
 }
 
@@ -1327,6 +1397,15 @@ impl Arena {
 
         chunk.alloc(layout).unwrap()
     }
+
+    pub fn clear(&mut self) {
+        let size = self.chunk.get_mut().size();
+        if self.chunk.get_mut().next().is_some() {
+            self.chunk = ArenaChunk::new(size + 1024, Default::default()).into();
+        } else {
+            self.chunk.get_mut().reset();
+        }
+    }
 }
 
 pub struct ArenaChunk {
@@ -1385,6 +1464,10 @@ impl ArenaChunk {
     pub fn size(&self) -> usize {
         self.base as usize + self.size - self.end as usize + self.next().map_or(0, Self::size)
     }
+
+    fn reset(&mut self) {
+        self.end = unsafe { self.base.add(self.size) };
+    }
 }
 
 impl Drop for ArenaChunk {
diff --git a/lang/src/son.rs b/lang/src/son.rs
index 697aae1..44f422f 100644
--- a/lang/src/son.rs
+++ b/lang/src/son.rs
@@ -14,8 +14,8 @@ use {
         reg, task,
         ty::{self, Arg, ArrayLen, Loc, Tuple},
         vc::{BitSet, Vc},
-        Comptime, Func, Global, HashMap, Offset, OffsetIter, PLoc, Reloc, Sig, SymKey, TypeParser,
-        TypedReloc, Types,
+        Comptime, FTask, Func, Global, HashMap, Offset, OffsetIter, PLoc, Reloc, Sig, StringRef,
+        SymKey, TypeParser, TypedReloc, Types,
     },
     alloc::{borrow::ToOwned, string::String, vec::Vec},
     core::{
@@ -1707,11 +1707,6 @@ fn write_reloc(doce: &mut [u8], offset: usize, value: i64, size: u16) {
     doce[offset..offset + size as usize].copy_from_slice(&value[..size as usize]);
 }
 
-struct FTask {
-    file: FileId,
-    id: ty::Func,
-}
-
 #[derive(Default, Debug)]
 struct Ctx {
     ty: Option<ty::Id>,
@@ -1727,6 +1722,9 @@ impl Ctx {
 struct Pool {
     cis: Vec<ItemCtx>,
     used_cis: usize,
+
+    #[expect(dead_code)]
+    ralloc: Regalloc,
 }
 
 impl Pool {
@@ -1766,6 +1764,10 @@ impl Pool {
         dst.scope.clear(&mut dst.nodes);
         *dst = core::mem::take(&mut self.cis[self.used_cis]);
     }
+
+    fn clear(&mut self) {
+        debug_assert_eq!(self.used_cis, 0);
+    }
 }
 
 struct Regalloc {
@@ -1827,109 +1829,49 @@ impl Value {
 }
 
 #[derive(Default)]
-pub struct Codegen<'a> {
-    pub files: &'a [parser::Ast],
-    pub errors: RefCell<String>,
-
-    tasks: Vec<Option<FTask>>,
+pub struct CodegenCtx {
+    pub parser: parser::Ctx,
     tys: Types,
-    ci: ItemCtx,
     pool: Pool,
-    #[expect(dead_code)]
-    ralloc: Regalloc,
     ct: Comptime,
 }
 
-impl TypeParser for Codegen<'_> {
-    fn tys(&mut self) -> &mut Types {
-        &mut self.tys
-    }
-
-    fn eval_const(&mut self, file: FileId, expr: &Expr, ret: ty::Id) -> u64 {
-        let mut scope = core::mem::take(&mut self.ci.scope.vars);
-        self.pool.push_ci(file, Some(ret), self.tasks.len(), &mut self.ci);
-        self.ci.scope.vars = scope;
-
-        let prev_err_len = self.errors.borrow().len();
-
-        self.expr(&Expr::Return { pos: expr.pos(), val: Some(expr) });
-
-        scope = core::mem::take(&mut self.ci.scope.vars);
-        self.ci.finalize();
-
-        let res = if self.errors.borrow().len() == prev_err_len {
-            self.emit_and_eval(file, ret, &mut [])
-        } else {
-            1
-        };
-
-        self.pool.pop_ci(&mut self.ci);
-        self.ci.scope.vars = scope;
-
-        res
-    }
-
-    fn infer_type(&mut self, expr: &Expr) -> ty::Id {
-        self.pool.save_ci(&self.ci);
-        let ty = self.expr(expr).map_or(ty::Id::NEVER, |v| v.ty);
-        self.pool.restore_ci(&mut self.ci);
-        ty
-    }
-
-    fn on_reuse(&mut self, existing: ty::Id) {
-        if let ty::Kind::Func(id) = existing.expand()
-            && let func = &mut self.tys.ins.funcs[id as usize]
-            && let Err(idx) = task::unpack(func.offset)
-            && idx < self.tasks.len()
-        {
-            func.offset = task::id(self.tasks.len());
-            let task = self.tasks[idx].take();
-            self.tasks.push(task);
-        }
-    }
-
-    fn eval_global(&mut self, file: FileId, name: Ident, expr: &Expr) -> ty::Id {
-        let gid = self.tys.ins.globals.len() as ty::Global;
-        self.tys.ins.globals.push(Global { file, name, ..Default::default() });
-
-        let ty = ty::Kind::Global(gid);
-        self.pool.push_ci(file, None, self.tasks.len(), &mut self.ci);
-        let prev_err_len = self.errors.borrow().len();
-
-        self.expr(&(Expr::Return { pos: expr.pos(), val: Some(expr) }));
-
-        self.ci.finalize();
-
-        let ret = self.ci.ret.expect("for return type to be infered");
-        if self.errors.borrow().len() == prev_err_len {
-            let mut mem = vec![0u8; self.tys.size_of(ret) as usize];
-            self.emit_and_eval(file, ret, &mut mem);
-            self.tys.ins.globals[gid as usize].data = mem;
-        }
-
-        self.pool.pop_ci(&mut self.ci);
-        self.tys.ins.globals[gid as usize].ty = ret;
-
-        ty.compress()
-    }
-
-    fn report(&self, pos: Pos, msg: impl Display) -> ty::Id {
-        self.report(pos, msg);
-        ty::Id::NEVER
-    }
-
-    fn find_local_ty(&mut self, ident: Ident) -> Option<ty::Id> {
-        self.ci.scope.vars.iter().rfind(|v| (v.id == ident && v.value() == NEVER)).map(|v| v.ty)
+impl CodegenCtx {
+    pub fn clear(&mut self) {
+        self.parser.clear();
+        self.tys.clear();
+        self.pool.clear();
+        self.ct.clear();
     }
 }
 
+pub struct Codegen<'a> {
+    pub files: &'a [parser::Ast],
+    pub errors: &'a RefCell<String>,
+    tys: &'a mut Types,
+    ci: ItemCtx,
+    pool: &'a mut Pool,
+    ct: &'a mut Comptime,
+}
+
 impl<'a> Codegen<'a> {
+    pub fn new(files: &'a [parser::Ast], ctx: &'a mut CodegenCtx) -> Self {
+        Self {
+            files,
+            errors: &ctx.parser.errors,
+            tys: &mut ctx.tys,
+            ci: Default::default(),
+            pool: &mut ctx.pool,
+            ct: &mut ctx.ct,
+        }
+    }
+
     fn emit_and_eval(&mut self, file: FileId, ret: ty::Id, ret_loc: &mut [u8]) -> u64 {
         if !self.complete_call_graph() {
             return 1;
         }
 
-        self.ci.emit_body(&mut self.tys, self.files, Sig { args: Tuple::empty(), ret });
+        self.ci.emit_body(self.tys, self.files, Sig { args: Tuple::empty(), ret });
         self.ci.code.truncate(self.ci.code.len() - instrs::jala(0, 0, 0).0);
         self.ci.emit(instrs::tx());
 
@@ -2006,12 +1948,12 @@ impl<'a> Codegen<'a> {
         debug_assert_ne!(region, VOID);
         debug_assert_ne!({ self.ci.nodes[region].ty }, ty::Id::VOID, "{:?}", {
             self.ci.nodes[region].lock_rc = Nid::MAX;
-            self.ci.nodes.graphviz_in_browser(&self.tys, self.files);
+            self.ci.nodes.graphviz_in_browser(self.tys, self.files);
         });
         debug_assert!(
             self.ci.nodes[region].kind != Kind::Load || self.ci.nodes[region].ty.is_pointer(),
             "{:?} {} {}",
-            self.ci.nodes.graphviz_in_browser(&self.tys, self.files),
+            self.ci.nodes.graphviz_in_browser(self.tys, self.files),
             self.cfile().path,
             self.ty_display(self.ci.nodes[region].ty)
         );
@@ -2043,8 +1985,8 @@ impl<'a> Codegen<'a> {
     fn make_func_reachable(&mut self, func: ty::Func) {
         let fuc = &mut self.tys.ins.funcs[func as usize];
         if fuc.offset == u32::MAX {
-            fuc.offset = task::id(self.tasks.len() as _);
-            self.tasks.push(Some(FTask { file: fuc.file, id: func }));
+            fuc.offset = task::id(self.tys.tasks.len() as _);
+            self.tys.tasks.push(Some(FTask { file: fuc.file, id: func }));
         }
     }
 
@@ -2114,12 +2056,18 @@ impl<'a> Codegen<'a> {
                 crate::endoce_string(literal, &mut data, report).unwrap();
 
                 let ty = self.tys.make_ptr(ty::Id::U8);
-                let global = match self.tys.ins.strings.entry(data.clone()) {
-                    hash_map::Entry::Occupied(occupied_entry) => *occupied_entry.get(),
-                    hash_map::Entry::Vacant(vacant_entry) => {
+                let global = match self.tys.strings.entry(&data, &self.tys.ins.globals) {
+                    (hash_map::RawEntryMut::Occupied(occupied_entry), _) => {
+                        occupied_entry.get_key_value().0.value.0
+                    }
+                    (hash_map::RawEntryMut::Vacant(vacant_entry), hash) => {
                         let global = self.tys.ins.globals.len() as ty::Global;
                         self.tys.ins.globals.push(Global { data, ty, ..Default::default() });
-                        *vacant_entry.insert(global)
+                        vacant_entry
+                            .insert(crate::ctx_map::Key { value: StringRef(global), hash }, ())
+                            .0
+                            .value
+                            .0
                     }
                 };
                 let global = self.ci.nodes.new_node(ty, Kind::Global { global }, [VOID]);
@@ -2204,7 +2152,7 @@ impl<'a> Codegen<'a> {
                     return Value::NEVER;
                 };
 
-                let Some((offset, ty)) = OffsetIter::offset_of(&self.tys, s, name) else {
+                let Some((offset, ty)) = OffsetIter::offset_of(self.tys, s, name) else {
                     let field_list = self
                         .tys
                         .struct_fields(s)
@@ -2267,7 +2215,7 @@ impl<'a> Codegen<'a> {
             }
             Expr::BinOp { left, op: TokenKind::Decl, right, .. } => {
                 let mut right = self.expr(right)?;
-                if right.ty.loc(&self.tys) == Loc::Stack {
+                if right.ty.loc(self.tys) == Loc::Stack {
                     let stck = self.ci.nodes.new_node_nop(right.ty, Kind::Stck, [VOID, MEM]);
                     self.store_mem(stck, right.ty, right.id);
                     right.id = stck;
@@ -2424,7 +2372,7 @@ impl<'a> Codegen<'a> {
                     );
                 }
 
-                match ty.loc(&self.tys) {
+                match ty.loc(self.tys) {
                     Loc::Reg if core::mem::take(&mut val.ptr) => val.id = self.load_mem(val.id, ty),
                     Loc::Stack if !val.ptr => {
                         let stack = self.ci.nodes.new_node_nop(ty, Kind::Stck, [VOID, MEM]);
@@ -2504,7 +2452,7 @@ impl<'a> Codegen<'a> {
                 let mut has_ptr_arg = false;
                 for arg in args {
                     let value = self.expr(arg)?;
-                    has_ptr_arg |= value.ty.has_pointers(&self.tys);
+                    has_ptr_arg |= value.ty.has_pointers(self.tys);
                     self.tys.tmp.args.push(value.ty);
                     debug_assert_ne!(self.ci.nodes[value.id].kind, Kind::Stre);
                     self.ci.nodes.lock(value.id);
@@ -2532,7 +2480,7 @@ impl<'a> Codegen<'a> {
                     });
                 }
 
-                let alt_value = match ty.loc(&self.tys) {
+                let alt_value = match ty.loc(self.tys) {
                     Loc::Reg => None,
                     Loc::Stack => {
                         let stck = self.ci.nodes.new_node_nop(ty, Kind::Stck, [VOID, MEM]);
@@ -2550,7 +2498,6 @@ impl<'a> Codegen<'a> {
 
                 alt_value.or(Some(Value::new(self.ci.ctrl).ty(ty)))
             }
-            //Expr::Directive { name: "inline", args: [func, args @ ..], .. }
             Expr::Call { func, args, .. } => {
                 self.ci.call_count += 1;
                 let ty = self.ty(func);
@@ -2588,11 +2535,11 @@ impl<'a> Codegen<'a> {
                 let mut cargs = cargs.iter();
                 let mut args = args.iter();
                 let mut has_ptr_arg = false;
-                while let Some(ty) = tys.next(&self.tys) {
+                while let Some(ty) = tys.next(self.tys) {
                     let carg = cargs.next().unwrap();
-                    let arg = args.next().unwrap();
+                    let Some(arg) = args.next() else { break };
                     let Arg::Value(ty) = ty else { continue };
-                    has_ptr_arg |= ty.has_pointers(&self.tys);
+                    has_ptr_arg |= ty.has_pointers(self.tys);
 
                     let mut value = self.expr_ctx(arg, Ctx::default().with_ty(ty))?;
                     debug_assert_ne!(self.ci.nodes[value.id].kind, Kind::Stre);
@@ -2621,7 +2568,7 @@ impl<'a> Codegen<'a> {
                     });
                 }
 
-                let alt_value = match sig.ret.loc(&self.tys) {
+                let alt_value = match sig.ret.loc(self.tys) {
                     Loc::Reg => None,
                     Loc::Stack => {
                         let stck = self.ci.nodes.new_node_nop(sig.ret, Kind::Stck, [VOID, MEM]);
@@ -2681,9 +2628,9 @@ impl<'a> Codegen<'a> {
                 let mut args = args.iter();
                 let mut cargs = cargs.iter();
                 let var_base = self.ci.scope.vars.len();
-                while let Some(aty) = tys.next(&self.tys) {
-                    let arg = args.next().unwrap();
+                while let Some(aty) = tys.next(self.tys) {
                     let carg = cargs.next().unwrap();
+                    let Some(arg) = args.next() else { break };
                     match aty {
                         Arg::Type(id) => {
                             self.ci.scope.vars.push(Variable::new(
@@ -2769,9 +2716,9 @@ impl<'a> Codegen<'a> {
                 match sty.expand() {
                     ty::Kind::Struct(s) => {
                         let mem = self.ci.nodes.new_node(sty, Kind::Stck, [VOID, MEM]);
-                        let mut offs = OffsetIter::new(s, &self.tys);
+                        let mut offs = OffsetIter::new(s, self.tys);
                         for field in fields {
-                            let Some((ty, offset)) = offs.next_ty(&self.tys) else {
+                            let Some((ty, offset)) = offs.next_ty(self.tys) else {
                                 self.report(
                                     field.pos(),
                                     "this init argumen overflows the field count",
@@ -2787,7 +2734,7 @@ impl<'a> Codegen<'a> {
                         }
 
                         let field_list = offs
-                            .into_iter(&self.tys)
+                            .into_iter(self.tys)
                             .map(|(f, ..)| self.tys.names.ident_str(f.name))
                             .intersperse(", ")
                             .collect::<String>();
@@ -2877,8 +2824,8 @@ impl<'a> Codegen<'a> {
                 };
 
                 // TODO: dont allocate
-                let mut offs = OffsetIter::new(s, &self.tys)
-                    .into_iter(&self.tys)
+                let mut offs = OffsetIter::new(s, self.tys)
+                    .into_iter(self.tys)
                     .map(|(f, o)| (f.ty, o))
                     .collect::<Vec<_>>();
                 let mem = self.ci.nodes.new_node(sty, Kind::Stck, [VOID, MEM]);
@@ -3131,7 +3078,10 @@ impl<'a> Codegen<'a> {
 
                 Some(Value::VOID)
             }
-            ref e => self.report_unhandled_ast(e, "bruh"),
+            ref e => {
+                self.report_unhandled_ast(e, "bruh");
+                Some(Value::VOID)
+            }
         }
     }
 
@@ -3144,8 +3094,8 @@ impl<'a> Codegen<'a> {
         lhs: Nid,
         rhs: Nid,
     ) -> bool {
-        let mut offs = OffsetIter::new(s, &self.tys);
-        while let Some((ty, off)) = offs.next_ty(&self.tys) {
+        let mut offs = OffsetIter::new(s, self.tys);
+        while let Some((ty, off)) = offs.next_ty(self.tys) {
             let lhs = self.offset(lhs, off);
             let rhs = self.offset(rhs, off);
             let dst = self.offset(dst, off);
@@ -3268,7 +3218,7 @@ impl<'a> Codegen<'a> {
                 };
 
                 for &CtorField { pos, name, ref value } in fields {
-                    let Some((offset, ty)) = OffsetIter::offset_of(&self.tys, idx, name) else {
+                    let Some((offset, ty)) = OffsetIter::offset_of(self.tys, idx, name) else {
                         self.report(pos, format_args!("field not found: {name:?}"));
                         continue;
                     };
@@ -3387,8 +3337,8 @@ impl<'a> Codegen<'a> {
 
     fn complete_call_graph(&mut self) -> bool {
         let prev_err_len = self.errors.borrow().len();
-        while self.ci.task_base < self.tasks.len()
-            && let Some(task_slot) = self.tasks.pop()
+        while self.ci.task_base < self.tys.tasks.len()
+            && let Some(task_slot) = self.tys.tasks.pop()
         {
             let Some(task) = task_slot else { continue };
             self.emit_func(task);
@@ -3413,7 +3363,7 @@ impl<'a> Codegen<'a> {
 
         let mut tys = sig.args.args();
         let mut args = args.iter();
-        while let Some(aty) = tys.next(&self.tys) {
+        while let Some(aty) = tys.next(self.tys) {
             let arg = args.next().unwrap();
             match aty {
                 Arg::Type(ty) => {
@@ -3427,12 +3377,12 @@ impl<'a> Codegen<'a> {
                 }
                 Arg::Value(ty) => {
                     let mut deps = Vc::from([VOID]);
-                    if ty.loc(&self.tys) == Loc::Stack && self.tys.size_of(ty) <= 16 {
+                    if ty.loc(self.tys) == Loc::Stack && self.tys.size_of(ty) <= 16 {
                         deps.push(MEM);
                     }
                     // TODO: whe we not using the deps?
                     let value = self.ci.nodes.new_node_nop(ty, Kind::Arg, deps);
-                    let ptr = ty.loc(&self.tys) == Loc::Stack;
+                    let ptr = ty.loc(self.tys) == Loc::Stack;
                     self.ci.scope.vars.push(Variable::new(
                         arg.id,
                         ty,
@@ -3457,7 +3407,7 @@ impl<'a> Codegen<'a> {
         self.ci.finalize();
 
         if self.errors.borrow().len() == prev_err_len {
-            self.ci.emit_body(&mut self.tys, self.files, sig);
+            self.ci.emit_body(self.tys, self.files, sig);
             self.tys.ins.funcs[id as usize].code.append(&mut self.ci.code);
             self.tys.ins.funcs[id as usize].relocs.append(&mut self.ci.relocs);
         }
@@ -3470,7 +3420,7 @@ impl<'a> Codegen<'a> {
     }
 
     fn ty_display(&self, ty: ty::Id) -> ty::Display {
-        ty::Display::new(&self.tys, self.files, ty)
+        ty::Display::new(self.tys, self.files, ty)
     }
 
     fn ast_display(&self, ast: &'a Expr<'a>) -> parser::Display<'a> {
@@ -3563,18 +3513,96 @@ impl<'a> Codegen<'a> {
     }
 
     #[track_caller]
-    fn report_unhandled_ast(&self, ast: &Expr, hint: impl Display) -> ! {
+    fn report_unhandled_ast(&self, ast: &Expr, hint: impl Display) {
         log::info!("{ast:#?}");
-        self.fatal_report(ast.pos(), fa!("compiler does not (yet) know how to handle ({hint})"));
+        self.report(ast.pos(), fa!("compiler does not (yet) know how to handle ({hint})"));
     }
 
     fn cfile(&self) -> &'a parser::Ast {
         &self.files[self.ci.file as usize]
     }
+}
 
-    fn fatal_report(&self, pos: Pos, msg: impl Display) -> ! {
+impl TypeParser for Codegen<'_> {
+    fn tys(&mut self) -> &mut Types {
+        self.tys
+    }
+
+    fn eval_const(&mut self, file: FileId, expr: &Expr, ret: ty::Id) -> u64 {
+        let mut scope = core::mem::take(&mut self.ci.scope.vars);
+        self.pool.push_ci(file, Some(ret), self.tys.tasks.len(), &mut self.ci);
+        self.ci.scope.vars = scope;
+
+        let prev_err_len = self.errors.borrow().len();
+
+        self.expr(&Expr::Return { pos: expr.pos(), val: Some(expr) });
+
+        scope = core::mem::take(&mut self.ci.scope.vars);
+        self.ci.finalize();
+
+        let res = if self.errors.borrow().len() == prev_err_len {
+            self.emit_and_eval(file, ret, &mut [])
+        } else {
+            1
+        };
+
+        self.pool.pop_ci(&mut self.ci);
+        self.ci.scope.vars = scope;
+
+        res
+    }
+
+    fn infer_type(&mut self, expr: &Expr) -> ty::Id {
+        self.pool.save_ci(&self.ci);
+        let ty = self.expr(expr).map_or(ty::Id::NEVER, |v| v.ty);
+        self.pool.restore_ci(&mut self.ci);
+        ty
+    }
+
+    fn on_reuse(&mut self, existing: ty::Id) {
+        if let ty::Kind::Func(id) = existing.expand()
+            && let func = &mut self.tys.ins.funcs[id as usize]
+            && let Err(idx) = task::unpack(func.offset)
+            && idx < self.tys.tasks.len()
+        {
+            func.offset = task::id(self.tys.tasks.len());
+            let task = self.tys.tasks[idx].take();
+            self.tys.tasks.push(task);
+        }
+    }
+
+    fn eval_global(&mut self, file: FileId, name: Ident, expr: &Expr) -> ty::Id {
+        let gid = self.tys.ins.globals.len() as ty::Global;
+        self.tys.ins.globals.push(Global { file, name, ..Default::default() });
+
+        let ty = ty::Kind::Global(gid);
+        self.pool.push_ci(file, None, self.tys.tasks.len(), &mut self.ci);
+        let prev_err_len = self.errors.borrow().len();
+
+        self.expr(&(Expr::Return { pos: expr.pos(), val: Some(expr) }));
+
+        self.ci.finalize();
+
+        let ret = self.ci.ret.expect("for return type to be infered");
+        if self.errors.borrow().len() == prev_err_len {
+            let mut mem = vec![0u8; self.tys.size_of(ret) as usize];
+            self.emit_and_eval(file, ret, &mut mem);
+            self.tys.ins.globals[gid as usize].data = mem;
+        }
+
+        self.pool.pop_ci(&mut self.ci);
+        self.tys.ins.globals[gid as usize].ty = ret;
+
+        ty.compress()
+    }
+
+    fn report(&self, pos: Pos, msg: impl Display) -> ty::Id {
         self.report(pos, msg);
-        panic!("{}", self.errors.borrow());
+        ty::Id::NEVER
+    }
+
+    fn find_local_ty(&mut self, ident: Ident) -> Option<ty::Id> {
+        self.ci.scope.vars.iter().rfind(|v| (v.id == ident && v.value() == NEVER)).map(|v| v.ty)
     }
 }
 
@@ -4373,17 +4401,108 @@ fn common_dom(mut a: Nid, mut b: Nid, nodes: &mut Nodes) -> Nid {
 #[cfg(test)]
 mod tests {
     use {
+        super::{Codegen, CodegenCtx},
+        crate::{
+            lexer::TokenKind,
+            parser::{self},
+        },
         alloc::{string::String, vec::Vec},
-        core::fmt::Write,
+        core::{fmt::Write, hash::BuildHasher, ops::Range},
     };
 
+    #[derive(Default)]
+    struct Rand(pub u64);
+
+    impl Rand {
+        pub fn next(&mut self) -> u64 {
+            self.0 = crate::FnvBuildHasher::default().hash_one(self.0);
+            self.0
+        }
+
+        pub fn range(&mut self, min: u64, max: u64) -> u64 {
+            self.next() % (max - min) + min
+        }
+    }
+
+    #[derive(Default)]
+    struct FuncGen {
+        rand: Rand,
+        buf: String,
+    }
+
+    impl FuncGen {
+        fn gen(&mut self, seed: u64) -> &str {
+            self.rand = Rand(seed);
+            self.buf.clear();
+            self.buf.push_str("main := fn(): void { return ");
+            self.expr().unwrap();
+            self.buf.push('}');
+            &self.buf
+        }
+
+        fn expr(&mut self) -> core::fmt::Result {
+            match self.rand.range(0, 100) {
+                0..80 => {
+                    write!(self.buf, "{}", self.rand.next())
+                }
+                80..100 => {
+                    self.expr()?;
+                    let ops = [
+                        TokenKind::Add,
+                        TokenKind::Sub,
+                        TokenKind::Mul,
+                        TokenKind::Div,
+                        TokenKind::Shl,
+                        TokenKind::Eq,
+                        TokenKind::Ne,
+                        TokenKind::Lt,
+                        TokenKind::Gt,
+                        TokenKind::Le,
+                        TokenKind::Ge,
+                        TokenKind::Band,
+                        TokenKind::Bor,
+                        TokenKind::Xor,
+                        TokenKind::Mod,
+                        TokenKind::Shr,
+                    ];
+                    let op = ops[self.rand.range(0, ops.len() as u64) as usize];
+                    write!(self.buf, " {op} ")?;
+                    self.expr()
+                }
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    fn fuzz(seed_range: Range<u64>) {
+        let mut gen = FuncGen::default();
+        let mut ctx = CodegenCtx::default();
+        for i in seed_range {
+            ctx.clear();
+            let src = gen.gen(i);
+            let parsed = parser::Ast::new("fuzz", src, &mut ctx.parser, &mut parser::no_loader);
+
+            let mut cdg = Codegen::new(core::slice::from_ref(&parsed), &mut ctx);
+            cdg.generate(0);
+        }
+    }
+
+    #[test]
+    #[ignore]
+    fn fuzz_test() {
+        _ = log::set_logger(&crate::fs::Logger);
+        log::set_max_level(log::LevelFilter::Info);
+        fuzz(0..10000);
+    }
+
     fn generate(ident: &'static str, input: &'static str, output: &mut String) {
         _ = log::set_logger(&crate::fs::Logger);
-        // log::set_max_level(log::LevelFilter::Info);
-        //        log::set_max_level(log::LevelFilter::Trace);
+        log::set_max_level(log::LevelFilter::Info);
+        //log::set_max_level(log::LevelFilter::Trace);
 
-        let (ref files, embeds) = crate::test_parse_files(ident, input);
-        let mut codegen = super::Codegen { files, ..Default::default() };
+        let mut ctx = CodegenCtx::default();
+        let (ref files, embeds) = crate::test_parse_files(ident, input, &mut ctx.parser);
+        let mut codegen = super::Codegen::new(files, &mut ctx);
         codegen.push_embeds(embeds);
 
         codegen.generate(0);