codegen: progress re-implementing rust interpreter

hoon/codegen/lib/line.hoon

@@ -1265,7 +1265,7 @@
   hill
 --
 ::    codegen interface
-:-  %1
+=+  %1
 |%
 ::  
 ::    core reference

hoon/codegen/sur/gene.hoon

@@ -202,11 +202,11 @@
 ::
 ::  long: starting label for direct calls    axis 2
 ::  want: input registers for direct calls   axis 6
-::  walt: input starting registers LR        axis 30
-::  wish: starting label for indirect calls  axis 62
-::  sire: input register for indirect calls  axis 126
-::  will: code table for arm                 axis 254
-::  sans: next SSA register                  axis 255
+::  walt: input starting registers LR        axis 14
+::  wish: starting label for indirect calls  axis 30
+::  sire: input register for indirect calls  axis 62
+::  will: code table for arm                 axis 126
+::  sans: next SSA register                  axis 127
 +$  pile
   $:  long=bile
       want=need

rust/ares/src/codegen.rs

@@ -0,0 +1,423 @@
+use crate::interpreter::{inc, interpret, Context, Error, Result, BAIL_EXIT};
+use crate::jets::seam::util::get_by;
+use crate::jets::util::slot;
+use crate::mem::NockStack;
+use crate::noun::{DirectAtom, Noun, D, NOUN_NONE, T};
+use ares_macros::tas;
+use std::mem::size_of;
+use std::ptr::write_bytes;
+use std::slice::{from_raw_parts, from_raw_parts_mut};
+
+#[derive(Copy, Clone)]
+struct Frame {
+    /// Slow stack as a list
+    slow: Noun,
+    /// Mean stack as a list
+    mean: Noun,
+    /// Code table for current arm
+    pile: Noun,
+    /// Continuation label when returning to this frame
+    cont: Noun,
+    /// Result register when returning to this frame
+    salt: usize,
+    /// number of locals
+    vars: usize,
+}
+
+impl Frame {
+    fn init(&mut self, vars: usize, prev: Option<&Frame>) {
+        *self = Frame {
+            slow: prev.map_or(D(0), |f| f.slow),
+            mean: prev.map_or(D(0), |f| f.mean),
+            pile: NOUN_NONE,
+            cont: NOUN_NONE,
+            salt: usize::MAX,
+            vars,
+        };
+        unsafe { write_bytes((self as *mut Frame).add(1) as *mut u64, 0, vars) };
+    }
+
+    unsafe fn current<'a>(stack: &NockStack) -> &'a Self {
+        &(*(stack.get_frame_base() as *const Frame))
+    }
+
+    unsafe fn current_mut<'a>(stack: &NockStack) -> &'a mut Self {
+        &mut (*(stack.get_frame_base() as *mut Frame))
+    }
+
+    fn vars<'a>(&self) -> &'a [Noun] {
+        unsafe { from_raw_parts((self as *const Frame).add(1) as *const Noun, self.vars) }
+    }
+
+    fn vars_mut<'a>(&mut self) -> &'a mut [Noun] {
+        unsafe { from_raw_parts_mut((self as *mut Frame).add(1) as *mut Noun, self.vars) }
+    }
+
+    fn mean_push(&mut self, stack: &mut NockStack, entry: Noun) {
+        self.mean = T(stack, &[entry, self.mean]);
+    }
+
+    fn mean_pop(&mut self) {
+        self.mean = self
+            .mean
+            .as_cell()
+            .expect("Cannot pop empty mean stack")
+            .tail();
+    }
+
+    fn slow_push(&mut self, stack: &mut NockStack, entry: Noun) {
+        self.slow = T(stack, &[entry, self.slow]);
+    }
+
+    fn slow_pop(&mut self) {
+        self.slow = self
+            .slow
+            .as_cell()
+            .expect("Cannot pop empty slow stack")
+            .tail();
+    }
+}
+
+assert_eq_align!(Frame, u64, usize);
+assert_eq_size!(u64, usize);
+const FRAME_WORD_SIZE: usize = size_of::<Frame>() / size_of::<u64>();
+
+fn push_interpreter_frame(stack: &mut NockStack, pile: Noun) {
+    let vars = pile_sans(pile);
+    let prev = unsafe { Frame::current(stack) };
+    stack.frame_push(FRAME_WORD_SIZE + vars);
+    let frame = unsafe { Frame::current_mut(stack) };
+    frame.init(vars, Some(prev));
+    frame.pile = pile;
+}
+
+fn push_outer_frame(stack: &mut NockStack, pile: Noun) {
+    let vars = pile_sans(pile);
+    stack.frame_push(FRAME_WORD_SIZE + vars);
+    let frame = unsafe { Frame::current_mut(stack) };
+    frame.init(vars, None);
+    frame.pile = pile;
+}
+
+const PEEK_AXIS: u64 = 4;
+const POKE_AXIS: u64 = 46;
+
+fn slam_line(context: &mut Context, arm_axis: u64, sample: Noun) -> Noun {
+    let axis_noun = DirectAtom::new_panic(arm_axis).as_noun();
+    let subject = T(&mut context.stack, &[sample, context.line]);
+    let sample_patch = T(&mut context.stack, &[D(6), D(0), D(2)]);
+    let arm_kick_form = T(&mut context.stack, &[D(9), axis_noun, D(0), D(3)]);
+    let gate_slam_form = T(
+        &mut context.stack,
+        &[D(9), D(2), D(10), sample_patch, arm_kick_form],
+    );
+    interpret(context, subject, gate_slam_form).expect("Crash in codegen")
+}
+
+fn cg_peek(context: &mut Context, subject: Noun, formula: Noun) -> Option<Noun> {
+    assert!(!context.line.is_none());
+    let sample = T(&mut context.stack, &[subject, formula]);
+    let peek_result = slam_line(context, PEEK_AXIS, sample);
+    if unsafe { peek_result.raw_equals(D(0)) } {
+        None
+    } else {
+        let unit_cell = peek_result.as_cell().expect("Peek should return unit");
+        Some(unit_cell.tail())
+    }
+}
+
+fn cg_poke(context: &mut Context, slow: Noun, subject: Noun, formula: Noun) {
+    assert!(!context.line.is_none());
+    let sample = T(
+        &mut context.stack,
+        &[D(tas!(b"comp")), slow, subject, formula],
+    );
+    let result = slam_line(context, POKE_AXIS, sample);
+    let new_line = slot(result, 7).expect("Poke should return triple");
+    context.line = new_line;
+}
+
+/// Get the $pile for an arm, possibly updating the line core
+fn cg_indirect(
+    context: &mut Context,
+    hill: &mut Noun,
+    slow: Noun,
+    subject: Noun,
+    formula: Noun,
+) -> Noun {
+    let bell_hill = if let Some(res) = cg_peek(context, subject, formula) {
+        res
+    } else {
+        cg_poke(context, slow, subject, formula);
+        cg_peek(context, subject, formula).expect("Codegen peek should return value after poke.")
+    };
+    let bell_hill_cell = bell_hill
+        .as_cell()
+        .expect("Codegen successful peek should return pair");
+    get_by(
+        &mut context.stack,
+        &mut bell_hill_cell.tail(),
+        &mut bell_hill_cell.head(),
+    )
+    .expect("Codegen bell lookup should succeed.")
+    .expect("Codegen peek bell should be in hill")
+}
+
+pub fn cg_interpret(context: &mut Context, slow: Noun, subject: Noun, formula: Noun) -> Result {
+    let mut hill = NOUN_NONE;
+    let outer_pile = cg_indirect(context, &mut hill, slow, subject, formula);
+    let virtual_frame = context.stack.get_frame_pointer();
+    push_outer_frame(&mut context.stack, outer_pile);
+    let mut wish = pile_wish(outer_pile);
+    let (mut body, mut bend) = get_blob(context, outer_pile, &mut wish);
+    let sire = pile_sire(outer_pile);
+    (unsafe { Frame::current_mut(&context.stack).vars_mut() })[sire] = subject;
+    let inner_res = 'interpret: loop {
+        let frame = unsafe { Frame::current_mut(&context.stack) };
+        if let Ok(body_cell) = body.as_cell() {
+            body = body_cell.tail();
+            let inst_cell = body_cell
+                .head()
+                .as_cell()
+                .expect("Codegen instruction should be a cell");
+            let inst_tag = inst_cell
+                .head()
+                .as_atom()
+                .expect("Codegen instruction tag should be atom")
+                .as_u64()
+                .expect("codegen instruction tag should convert to u64");
+            match inst_tag {
+                tas!(b"imm") => {
+                    let imm_cell = inst_cell.tail().as_cell().unwrap();
+                    let imm_n = imm_cell.head();
+                    let imm_d = imm_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    frame.vars_mut()[imm_d] = imm_n;
+                }
+                tas!(b"mov") => {
+                    let mov_cell = inst_cell.tail().as_cell().unwrap();
+                    let mov_s = mov_cell.head().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let mov_d = mov_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    frame.vars_mut()[mov_d] = frame.vars()[mov_s];
+                }
+                tas!(b"inc") => {
+                    let inc_cell = inst_cell.tail().as_cell().unwrap();
+                    let inc_s = inc_cell.head().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let inc_d = inc_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    if let Ok(s_atom) = frame.vars()[inc_s].as_atom() {
+                        frame.vars_mut()[inc_d] = inc(&mut context.stack, s_atom).as_noun();
+                    } else {
+                        break BAIL_EXIT;
+                    }
+                }
+                tas!(b"con") => {
+                    let con_cell = inst_cell.tail().as_cell().unwrap();
+                    let con_h = con_cell.head().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let con_tell = con_cell.tail().as_cell().unwrap();
+                    let con_t = con_tell.head().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let con_d = con_tell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    frame.vars_mut()[con_d] = T(
+                        &mut context.stack,
+                        &[frame.vars()[con_h], frame.vars()[con_t]],
+                    );
+                }
+                tas!(b"hed") => {
+                    let hed_cell = inst_cell.tail().as_cell().unwrap();
+                    let hed_s = hed_cell.head().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let hed_d = hed_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let s_noun = frame.vars()[hed_s];
+                    if s_noun.is_none() {
+                        frame.vars_mut()[hed_d] = NOUN_NONE;
+                    } else if let Ok(s_cell) = frame.vars()[hed_s].as_cell() {
+                        frame.vars_mut()[hed_d] = s_cell.head();
+                    } else {
+                        frame.vars_mut()[hed_d] = NOUN_NONE;
+                    }
+                }
+                tas!(b"tal") => {
+                    let tal_cell = inst_cell.tail().as_cell().unwrap();
+                    let tal_s = tal_cell.head().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let tal_d = tal_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let s_noun = frame.vars()[tal_s];
+                    if s_noun.is_none() {
+                        frame.vars_mut()[tal_d] = NOUN_NONE;
+                    } else if let Ok(s_cell) = frame.vars()[tal_s].as_cell() {
+                        frame.vars_mut()[tal_d] = s_cell.tail();
+                    } else {
+                        frame.vars_mut()[tal_d] = NOUN_NONE;
+                    }
+                }
+                tas!(b"men") => {
+                    let men_cell = inst_cell.tail().as_cell().unwrap();
+                    let men_l = men_cell.head();
+                    assert!(men_l.is_atom());
+                    let men_s = men_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let men_entry = T(&mut context.stack, &[men_l, frame.vars()[men_s]]);
+                    frame.mean = T(&mut context.stack, &[men_entry, frame.mean])
+                }
+                tas!(b"man") => {
+                    frame.mean = frame.mean.as_cell().unwrap().tail();
+                }
+                tas!(b"slo") => {
+                    let slo_s = inst_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    let slo_tag = frame.vars()[slo_s];
+                    assert!(slo_tag.is_atom());
+                    frame.slow = T(&mut context.stack, &[slo_tag, frame.slow]);
+                }
+                tas!(b"sld") => {
+                    frame.slow = frame.slow.as_cell().unwrap().tail();
+                    todo!("sld")
+                }
+                tas!(b"hit") => {
+                    // XX TODO implement
+                }
+                tas!(b"slg") => {
+                    let slg_s = inst_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    context
+                        .newt
+                        .slog(&mut context.stack, 0, frame.vars()[slg_s]);
+                }
+                tas!(b"mew") => {
+                    // XX TODO implement
+                }
+                tas!(b"tim") => {
+                    // XX TODO implement
+                }
+                tas!(b"tom") => {
+                    // XX TODO implement
+                }
+                tas!(b"mem") => {
+                    // XX TODO implement
+                }
+                tas!(b"poi") => {
+                    let poi_p = inst_cell.tail().as_atom().unwrap().as_u64().unwrap() as usize;
+                    frame.vars_mut()[poi_p] = NOUN_NONE;
+                }
+                tas!(b"ipb") => {
+                    let mut ipb_p = inst_cell.tail();
+                    'ipb: loop {
+                        if unsafe { ipb_p.raw_equals(D(0)) } {
+                            break 'ipb;
+                        } else {
+                            let p_cell = ipb_p.as_cell().unwrap();
+                            ipb_p = p_cell.tail();
+                            let p_i = p_cell.head().as_atom().unwrap().as_u64().unwrap() as usize;
+                            if frame.vars()[p_i].is_none() {
+                                break 'interpret BAIL_EXIT;
+                            }
+                        }
+                    }
+                }
+                _ => {
+                    panic!("Codegen instruction unsupported");
+                }
+            }
+        } else {
+            let inst_cell = bend
+                .as_cell()
+                .expect("Codegen instruction should be a cell");
+            let inst_tag = inst_cell
+                .head()
+                .as_atom()
+                .expect("Codegen instruction tag should be atom")
+                .as_u64()
+                .expect("codegen instruction tag should convert to u64");
+            match inst_tag {
+                tas!(b"clq") => {
+                    todo!("clq")
+                }
+                tas!(b"eqq") => {
+                    todo!("eqq")
+                }
+                tas!(b"brn") => {
+                    todo!("brn")
+                }
+                tas!(b"hop") => {
+                    todo!("hop")
+                }
+                tas!(b"hip") => {
+                    todo!("hip")
+                }
+                tas!(b"lnk") => {
+                    todo!("lnk")
+                }
+                tas!(b"cal") => {
+                    todo!("cal")
+                }
+                tas!(b"caf") => {
+                    todo!("caf")
+                }
+                tas!(b"lnt") => {
+                    todo!("lnt")
+                }
+                tas!(b"jmp") => {
+                    todo!("jmp")
+                }
+                tas!(b"jmf") => {
+                    todo!("jmf")
+                }
+                tas!(b"spy") => {
+                    todo!("spy")
+                }
+                tas!(b"mer") => {
+                    todo!("mer")
+                }
+                tas!(b"don") => {
+                    todo!("don")
+                }
+                tas!(b"bom") => {
+                    todo!("bom")
+                }
+                _ => {
+                    panic!("Codegen instruction unsupported");
+                }
+            }
+        }
+    };
+    match inner_res {
+        Ok(res) => inner_res,
+        Err(err) => exit(context, err),
+    }
+}
+
+/// Crash with an
+fn exit(context: &mut Context, err: Error) -> Result {
+    todo!("exit")
+}
+
+fn pile_sans(pile: Noun) -> usize {
+    (slot(pile, 127)
+        .expect("Codegen pile should have sans face")
+        .as_atom()
+        .expect("Codegen sans should be atom")
+        .as_u64()
+        .expect("Codegen sans too big")) as usize
+}
+
+fn pile_wish(pile: Noun) -> Noun {
+    slot(pile, 30).expect("Codegen pile should have wish face")
+}
+
+fn pile_sire(pile: Noun) -> usize {
+    (slot(pile, 62)
+        .expect("Codegen pile should have sire face")
+        .as_atom()
+        .expect("Codegen sire should be atom")
+        .as_u64()
+        .expect("Codegen sire too big")) as usize
+}
+
+fn pile_will(pile: Noun) -> Noun {
+    slot(pile, 126).expect("Codegen pile should have will face")
+}
+
+fn get_blob(context: &mut Context, pile: Noun, bile: &mut Noun) -> (Noun, Noun) {
+    let mut will = pile_will(pile);
+    let blob_with_biff = get_by(&mut context.stack, &mut will, bile)
+        .expect("Codegen bile lookup successful")
+        .expect("Codegen will has bile");
+    let blob_cell = slot(blob_with_biff, 3)
+        .expect("Codegen blob has tail")
+        .as_cell()
+        .expect("Codegen blob tail should be cell");
+    (blob_cell.head(), blob_cell.tail())
+}

rust/ares/src/interpreter.rs

@@ -268,6 +268,7 @@ pub struct Context {
     pub cold: Cold,
     pub warm: Warm,
     pub hot: Hot,
+    pub line: Noun,
     pub cache: Hamt<Noun>,
     pub scry_stack: Noun,
     pub trace_info: Option<TraceInfo>,
@@ -360,7 +361,7 @@ impl From<cold::Error> for Error {
 
 pub type Result = result::Result<Noun, Error>;
 
-const BAIL_EXIT: Result = Err(Error::Deterministic(Mote::Exit, D(0)));
+pub const BAIL_EXIT: Result = Err(Error::Deterministic(Mote::Exit, D(0)));
 const BAIL_FAIL: Result = Err(Error::NonDeterministic(Mote::Fail, D(0)));
 const BAIL_INTR: Result = Err(Error::NonDeterministic(Mote::Intr, D(0)));
 

rust/ares/src/jets.rs

@@ -310,7 +310,7 @@ pub mod util {
         use super::*;
         use crate::hamt::Hamt;
         use crate::mem::NockStack;
-        use crate::noun::{Atom, Noun, D, T};
+        use crate::noun::{Atom, Noun, D, NOUN_NONE, T};
         use crate::unifying_equality::unifying_equality;
         use assert_no_alloc::assert_no_alloc;
         use ibig::UBig;
@@ -322,6 +322,7 @@ pub mod util {
             let warm = Warm::new(&mut stack);
             let hot = Hot::init(&mut stack, URBIT_HOT_STATE);
             let cache = Hamt::<Noun>::new(&mut stack);
+            let line = NOUN_NONE;
 
             Context {
                 stack,
@@ -330,6 +331,7 @@ pub mod util {
                 warm,
                 hot,
                 cache,
+                line,
                 scry_stack: D(0),
                 trace_info: None,
             }

rust/ares/src/jets/seam.rs

@@ -5,7 +5,6 @@
 // use crate::jets::util::*;
 // use crate::jets::Result;
 // use crate::noun::{IndirectAtom, Noun, D};
-
 use self::util::*;
 
 crate::gdb!();
@@ -13,14 +12,14 @@ crate::gdb!();
 // XX TODO actual jets
 
 pub mod util {
-    use crate::mug::mug_u32;
-    use crate::unifying_equality::unifying_equality;
-    use crate::mem::NockStack;
     use crate::jets::math::util::lth_b;
     use crate::jets::util::slot;
-    use crate::noun::{Noun, D};
-    use either::Either::*;
     use crate::jets::JetErr;
+    use crate::mem::NockStack;
+    use crate::mug::mug_u32;
+    use crate::noun::{Noun, D};
+    use crate::unifying_equality::unifying_equality;
+    use either::Either::*;
 
     pub fn dor_b(stack: &mut NockStack, a: &mut Noun, b: &mut Noun) -> bool {
         let mut ap = a as *mut Noun;
@@ -38,10 +37,14 @@ pub mod util {
                             } else {
                                 break true;
                             }
-                        },
+                        }
                         Right(a_cell) => {
                             if let Ok(b_cell) = (*bp).as_cell() {
-                                if unifying_equality(stack, a_cell.head_as_mut(), b_cell.head_as_mut()) {
+                                if unifying_equality(
+                                    stack,
+                                    a_cell.head_as_mut(),
+                                    b_cell.head_as_mut(),
+                                ) {
                                     ap = a_cell.tail_as_mut();
                                     bp = b_cell.tail_as_mut();
                                     continue;
@@ -70,7 +73,11 @@ pub mod util {
         }
     }
 
-    pub fn get_by(stack: &mut NockStack, a: &mut Noun, b: &mut Noun) -> Result<Option<Noun>, JetErr> {
+    pub fn get_by(
+        stack: &mut NockStack,
+        a: &mut Noun,
+        b: &mut Noun,
+    ) -> Result<Option<Noun>, JetErr> {
         let mut ap = a as *mut Noun;
         let bp = b as *mut Noun;
         unsafe {

rust/ares/src/lib.rs

@@ -3,6 +3,7 @@ extern crate num_derive;
 extern crate lazy_static;
 #[macro_use]
 extern crate static_assertions;
+pub mod codegen;
 pub mod flog;
 pub mod guard;
 pub mod hamt;

rust/ares/src/mem.rs

@@ -9,7 +9,7 @@ use memmap::MmapMut;
 use std::alloc::Layout;
 use std::mem;
 use std::ptr;
-use std::ptr::copy_nonoverlapping;
+use std::ptr::{copy, copy_nonoverlapping};
 
 crate::gdb!();
 
@@ -146,6 +146,45 @@ impl NockStack {
         self.frame_pointer
     }
 
+    pub fn get_frame_base(&self) -> *mut u64 {
+        if self.is_west() {
+            unsafe { *(self.prev_alloc_pointer_pointer()) }
+        } else {
+            unsafe { self.frame_pointer.add(RESERVED) }
+        }
+    }
+
+    pub unsafe fn resize_frame(&mut self, new_size: usize) {
+        // lightweight stack must be empty
+        assert!(self.stack_pointer == self.frame_pointer);
+        let raw_new_size = (new_size + RESERVED) as isize;
+        if self.is_west() {
+            let current_size = self
+                .frame_pointer
+                .offset_from(*(self.prev_alloc_pointer_pointer()));
+            assert!(current_size >= RESERVED as isize);
+            let offset = raw_new_size - current_size;
+            let new_frame_pointer = self.frame_pointer.offset(offset);
+            copy(
+                self.frame_pointer.sub(RESERVED),
+                new_frame_pointer.sub(RESERVED),
+                RESERVED,
+            );
+            self.frame_pointer = new_frame_pointer;
+            self.stack_pointer = new_frame_pointer;
+        } else {
+            let current_size =
+                (*(self.prev_alloc_pointer_pointer())).offset_from(self.frame_pointer);
+            assert!(current_size >= RESERVED as isize);
+            let offset = current_size - raw_new_size;
+            let new_frame_pointer = self.frame_pointer.offset(offset);
+            let copy_size = current_size.min(raw_new_size);
+            copy(self.frame_pointer, new_frame_pointer, RESERVED);
+            self.frame_pointer = new_frame_pointer;
+            self.stack_pointer = new_frame_pointer;
+        }
+    }
+
     /** Current stack pointer of this NockStack */
     pub fn get_stack_pointer(&self) -> *const u64 {
         self.stack_pointer

rust/ares/src/noun.rs

@@ -31,6 +31,9 @@ const CELL_TAG: u64 = u64::MAX & INDIRECT_MASK;
 /** Tag mask for a cell. */
 const CELL_MASK: u64 = !(u64::MAX >> 3);
 
+const NONE_BITS: u64 = !(u64::MAX >> 3);
+pub const NOUN_NONE: Noun = Noun { raw: NONE_BITS };
+
 /*  A note on forwarding pointers:
  *
  *  Forwarding pointers are only used temporarily during copies between NockStack frames and between
@@ -155,6 +158,10 @@ fn is_cell(noun: u64) -> bool {
     noun & CELL_MASK == CELL_TAG
 }
 
+fn is_none(noun: u64) -> bool {
+    noun == NONE_BITS
+}
+
 /** A noun-related error. */
 #[derive(Debug, PartialEq)]
 pub enum Error {
@@ -1023,14 +1030,16 @@ pub union Noun {
 
 impl Noun {
     pub fn is_none(self) -> bool {
-        unsafe { self.raw == u64::MAX }
+        unsafe { is_none(self.raw) }
     }
 
     pub fn is_direct(&self) -> bool {
+        assert!(!self.is_none());
         unsafe { is_direct_atom(self.raw) }
     }
 
     pub fn is_indirect(&self) -> bool {
+        assert!(!self.is_none());
         unsafe { is_indirect_atom(self.raw) }
     }
 
@@ -1043,6 +1052,7 @@ impl Noun {
     }
 
     pub fn is_cell(&self) -> bool {
+        assert!(!self.is_none());
         unsafe { is_cell(self.raw) }
     }
 

rust/ares/src/serf.rs

@@ -8,7 +8,7 @@ use crate::jets::warm::Warm;
 use crate::mem::NockStack;
 use crate::mug::*;
 use crate::newt::Newt;
-use crate::noun::{Atom, Cell, DirectAtom, Noun, Slots, D, T};
+use crate::noun::{Atom, Cell, DirectAtom, Noun, Slots, D, NOUN_NONE, T};
 use crate::persist::pma_meta_set;
 use crate::persist::{pma_meta_get, pma_open, pma_sync, Persist};
 use crate::trace::*;
@@ -172,6 +172,7 @@ impl Context {
             cache,
             scry_stack: D(0),
             trace_info,
+            line: NOUN_NONE,
         };
 
         Context {