haku2: on the client

resource indicators are currently unimplemented

crates/haku-wasm/src/lib.rs

@@ -2,9 +2,9 @@
 
 extern crate alloc;
 
-use core::{alloc::Layout, slice};
+use core::{alloc::Layout, mem, slice};
 
-use alloc::{boxed::Box, vec::Vec};
+use alloc::{boxed::Box, string::String, vec::Vec};
 use haku::{
     ast::Ast,
     bytecode::{Chunk, Defs, DefsImage, DefsLimits},
@@ -12,16 +12,13 @@ use haku::{
     diagnostic::Diagnostic,
     lexer::{lex, Lexer},
     parser::{self, IntoAstError, Parser},
-    render::{
+    render::tiny_skia::{
-        tiny_skia::{Pixmap, PremultipliedColorU8},
+        BlendMode, Color, FillRule, LineCap, Paint, PathBuilder, Pixmap, PremultipliedColorU8,
-        RendererLimits,
+        Rect, Shader, Stroke, Transform,
     },
     source::SourceCode,
-    system::{ChunkId, System, SystemImage},
+    system::{System, SystemImage},
     token::Lexis,
-    trampoline::{Cont, Trampoline},
-    value::{Closure, Ref, Vec2},
-    vm::{Exception, Vm, VmImage, VmLimits},
 };
 use log::{debug, info};
 
@@ -57,8 +54,7 @@ struct Limits {
     ref_capacity: usize,
     fuel: usize,
     memory: usize,
-    pixmap_stack_capacity: usize,
+    render_max_depth: usize,
-    transform_stack_capacity: usize,
 }
 
 impl Default for Limits {
@@ -77,8 +73,7 @@ impl Default for Limits {
             ref_capacity: 2048,
             fuel: 65536,
             memory: 1024 * 1024,
-            pixmap_stack_capacity: 4,
+            render_max_depth: 256,
-            transform_stack_capacity: 16,
         }
     }
 }
@@ -123,8 +118,7 @@ limit_setter!(call_stack_capacity);
 limit_setter!(ref_capacity);
 limit_setter!(fuel);
 limit_setter!(memory);
-limit_setter!(pixmap_stack_capacity);
+limit_setter!(render_max_depth);
-limit_setter!(transform_stack_capacity);
 
 #[derive(Debug, Clone)]
 struct Instance {
@@ -134,23 +128,23 @@ struct Instance {
     system_image: SystemImage,
     defs: Defs,
     defs_image: DefsImage,
-    vm: Vm,
-    vm_image: VmImage,
 
-    trampoline: Option<Trampoline>,
+    compile_result2: Option<CompileResult>,
-    exception: Option<Exception>,
+    diagnostics2: Vec<Diagnostic>,
 }
 
-impl Instance {
+#[derive(Debug, Clone)]
-    fn set_exception(&mut self, exn: Exception) {
+struct CompileResult {
-        debug!("setting exception = {exn:?}");
+    defs_string: String,
-        self.exception = Some(exn);
+    tags_string: String,
+    chunk: Chunk,
+    closure_spec: ClosureSpec,
+    stats: CompileStats,
 }
 
-    fn reset_exception(&mut self) {
+#[derive(Debug, Clone)]
-        debug!("resetting exception");
+struct CompileStats {
-        self.exception = None;
+    ast_size: usize,
-    }
 }
 
 #[unsafe(no_mangle)]
@@ -164,20 +158,9 @@ unsafe extern "C" fn haku_instance_new(limits: *const Limits) -> *mut Instance {
         max_defs: limits.max_defs,
         max_tags: limits.max_tags,
     });
-    let vm = Vm::new(
-        &defs,
-        &VmLimits {
-            stack_capacity: limits.stack_capacity,
-            call_stack_capacity: limits.call_stack_capacity,
-            ref_capacity: limits.ref_capacity,
-            fuel: limits.fuel,
-            memory: limits.memory,
-        },
-    );
 
     let system_image = system.image();
     let defs_image = defs.image();
-    let vm_image = vm.image();
 
     let instance = Box::new(Instance {
         limits,
@@ -185,10 +168,8 @@ unsafe extern "C" fn haku_instance_new(limits: *const Limits) -> *mut Instance {
         system_image,
         defs,
         defs_image,
-        vm,
+        compile_result2: None,
-        vm_image,
+        diagnostics2: Vec::new(),
-        trampoline: None,
-        exception: None,
     });
 
     let ptr = Box::leak(instance) as *mut _;
@@ -210,21 +191,6 @@ unsafe extern "C" fn haku_reset(instance: *mut Instance) {
     instance.defs.restore_image(&instance.defs_image);
 }
 
-#[unsafe(no_mangle)]
-unsafe extern "C" fn haku_has_exception(instance: *mut Instance) -> bool {
-    (*instance).exception.is_some()
-}
-
-#[unsafe(no_mangle)]
-unsafe extern "C" fn haku_exception_message(instance: *const Instance) -> *const u8 {
-    (*instance).exception.as_ref().unwrap().message.as_ptr()
-}
-
-#[unsafe(no_mangle)]
-unsafe extern "C" fn haku_exception_message_len(instance: *const Instance) -> u32 {
-    (*instance).exception.as_ref().unwrap().message.len() as u32
-}
-
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 #[repr(C)]
 enum StatusCode {
@@ -236,10 +202,6 @@ enum StatusCode {
     ParserUnbalancedEvents,
     ChunkTooBig,
     DiagnosticsEmitted,
-    TooManyChunks,
-    OutOfRefSlots,
-    EvalException,
-    RenderException,
 }
 
 #[unsafe(no_mangle)]
@@ -252,14 +214,6 @@ extern "C" fn haku_is_diagnostics_emitted(code: StatusCode) -> bool {
     code == StatusCode::DiagnosticsEmitted
 }
 
-#[unsafe(no_mangle)]
-extern "C" fn haku_is_exception(code: StatusCode) -> bool {
-    matches!(
-        code,
-        StatusCode::EvalException | StatusCode::RenderException
-    )
-}
-
 #[unsafe(no_mangle)]
 extern "C" fn haku_status_string(code: StatusCode) -> *const i8 {
     match code {
@@ -271,91 +225,162 @@ extern "C" fn haku_status_string(code: StatusCode) -> *const i8 {
         StatusCode::ParserUnbalancedEvents => c"parser produced unbalanced events",
         StatusCode::ChunkTooBig => c"compiled bytecode is too large",
         StatusCode::DiagnosticsEmitted => c"diagnostics were emitted",
-        StatusCode::TooManyChunks => c"too many registered bytecode chunks",
-        StatusCode::OutOfRefSlots => c"out of ref slots (did you forget to restore the VM image?)",
-        StatusCode::EvalException => c"an exception occurred while evaluating your code",
-        StatusCode::RenderException => c"an exception occurred while rendering your brush",
     }
     .as_ptr()
 }
 
-#[derive(Debug)]
+struct PixmapCanvas {
-struct CompileStats {
+    pixmap: Pixmap,
-    ast_size: usize,
+    pb: PathBuilder,
-}
+    transform: Transform,
-
-#[derive(Debug)]
-struct RunnableBrush {
-    chunk_id: ChunkId,
-    closure_spec: ClosureSpec,
-
-    compile_stats: CompileStats,
-}
-
-#[derive(Debug, Default)]
-enum BrushState {
-    #[default]
-    Default,
-    Ready(RunnableBrush),
-}
-
-#[derive(Debug, Default)]
-struct Brush {
-    diagnostics: Vec<Diagnostic>,
-    state: BrushState,
 }
 
 #[unsafe(no_mangle)]
-extern "C" fn haku_brush_new() -> *mut Brush {
+extern "C" fn haku_pixmap_new(width: u32, height: u32) -> *mut PixmapCanvas {
-    let ptr = Box::leak(Box::new(Brush::default())) as *mut _;
+    let ptr = Box::leak(Box::new(PixmapCanvas {
-    debug!("created brush: {ptr:?}");
+        pixmap: Pixmap::new(width, height).expect("invalid pixmap size"),
+        pb: PathBuilder::new(),
+        transform: Transform::identity(),
+    })) as *mut _;
+    debug!("created pixmap with size {width}x{height}: {ptr:?}");
     ptr
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_brush_destroy(brush: *mut Brush) {
+unsafe extern "C" fn haku_pixmap_destroy(c: *mut PixmapCanvas) {
-    debug!("destroying brush: {brush:?}");
+    debug!("destroying pixmap: {c:?}");
-    drop(Box::from_raw(brush))
+    drop(Box::from_raw(c))
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_num_diagnostics(brush: *const Brush) -> u32 {
+unsafe extern "C" fn haku_pixmap_data(c: *mut PixmapCanvas) -> *mut u8 {
-    (*brush).diagnostics.len() as u32
+    let c = &mut *c;
+    c.pixmap.pixels_mut().as_mut_ptr() as *mut u8
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_diagnostic_start(brush: *const Brush, index: u32) -> u32 {
+unsafe extern "C" fn haku_pixmap_clear(c: *mut PixmapCanvas) {
-    (*brush).diagnostics[index as usize].span().start
+    let c = &mut *c;
+    c.pixmap
+        .pixels_mut()
+        .fill(PremultipliedColorU8::TRANSPARENT);
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_diagnostic_end(brush: *const Brush, index: u32) -> u32 {
+unsafe extern "C" fn haku_pixmap_set_translation(c: *mut PixmapCanvas, x: f32, y: f32) {
-    (*brush).diagnostics[index as usize].span().end
+    let c = &mut *c;
+    c.transform = Transform::from_translate(x, y);
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_diagnostic_message(brush: *const Brush, index: u32) -> *const u8 {
+unsafe extern "C" fn haku_pixmap_begin(c: *mut PixmapCanvas) -> bool {
-    (*brush).diagnostics[index as usize].message().as_ptr()
+    let c = &mut *c;
+    c.pb.clear();
+    true
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_diagnostic_message_len(brush: *const Brush, index: u32) -> u32 {
+unsafe extern "C" fn haku_pixmap_line(
-    (*brush).diagnostics[index as usize].message().len() as u32
+    c: *mut PixmapCanvas,
+    x1: f32,
+    y1: f32,
+    x2: f32,
+    y2: f32,
+) -> bool {
+    let c = &mut *c;
+    c.pb.move_to(x1, y1);
+    c.pb.line_to(x2, y2);
+    true
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_compile_brush(
+unsafe extern "C" fn haku_pixmap_rectangle(
+    c: *mut PixmapCanvas,
+    x: f32,
+    y: f32,
+    width: f32,
+    height: f32,
+) -> bool {
+    let c = &mut *c;
+    if let Some(rect) = Rect::from_xywh(x, y, width, height) {
+        c.pb.push_rect(rect);
+    }
+    true
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_pixmap_circle(c: *mut PixmapCanvas, x: f32, y: f32, r: f32) -> bool {
+    let c = &mut *c;
+    c.pb.push_circle(x, y, r);
+    true
+}
+
+fn default_paint() -> Paint<'static> {
+    Paint {
+        shader: Shader::SolidColor(Color::BLACK),
+        blend_mode: BlendMode::SourceOver,
+        anti_alias: false,
+        force_hq_pipeline: false,
+    }
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_pixmap_fill(c: *mut PixmapCanvas, r: u8, g: u8, b: u8, a: u8) -> bool {
+    let c = &mut *c;
+    let pb = mem::take(&mut c.pb);
+    if let Some(path) = pb.finish() {
+        let paint = Paint {
+            shader: Shader::SolidColor(Color::from_rgba8(r, g, b, a)),
+            ..default_paint()
+        };
+        c.pixmap
+            .fill_path(&path, &paint, FillRule::EvenOdd, c.transform, None);
+    }
+    true
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_pixmap_stroke(
+    c: *mut PixmapCanvas,
+    r: u8,
+    g: u8,
+    b: u8,
+    a: u8,
+    thickness: f32,
+) -> bool {
+    let c = &mut *c;
+    let pb = mem::take(&mut c.pb);
+    if let Some(path) = pb.finish() {
+        let paint = Paint {
+            shader: Shader::SolidColor(Color::from_rgba8(r, g, b, a)),
+            ..default_paint()
+        };
+        c.pixmap.stroke_path(
+            &path,
+            &paint,
+            &Stroke {
+                width: thickness,
+                line_cap: LineCap::Round,
+                ..Default::default()
+            },
+            c.transform,
+            None,
+        );
+    }
+    true
+}
+
+// v2 compile-only support
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_compile_brush2(
     instance: *mut Instance,
-    out_brush: *mut Brush,
     code_len: u32,
     code: *const u8,
 ) -> StatusCode {
-    info!("compiling brush");
+    info!("compiling brush (2)");
 
     let instance = &mut *instance;
-    let brush = &mut *out_brush;
-
-    *brush = Brush::default();
 
     let code = core::str::from_utf8(slice::from_raw_parts(code, code_len as usize))
         .expect("invalid UTF-8");
@@ -428,8 +453,8 @@ unsafe extern "C" fn haku_compile_brush(
     let mut diagnostics = lexer.diagnostics;
     diagnostics.append(&mut parser_diagnostics);
     diagnostics.append(&mut compiler.diagnostics);
-    if !diagnostics.is_empty() {
+    instance.diagnostics2 = diagnostics;
-        brush.diagnostics = diagnostics;
+    if !instance.diagnostics2.is_empty() {
         debug!("compiling failed: diagnostics were emitted");
         return StatusCode::DiagnosticsEmitted;
     }
@@ -440,179 +465,82 @@ unsafe extern "C" fn haku_compile_brush(
     );
     debug!("compiling: {closure_spec:?}");
 
-    let chunk_id = match instance.system.add_chunk(chunk) {
+    instance.compile_result2 = Some(CompileResult {
-        Ok(chunk_id) => chunk_id,
+        defs_string: instance.defs.serialize_defs(),
-        Err(_) => return StatusCode::TooManyChunks,
+        tags_string: instance.defs.serialize_tags(),
-    };
+        chunk,
-    brush.state = BrushState::Ready(RunnableBrush {
-        chunk_id,
         closure_spec,
-        compile_stats: CompileStats {
+        stats: CompileStats {
             ast_size: ast.len(),
         },
     });
 
-    info!("brush compiled into {chunk_id:?}");
+    info!("brush code compiled into instance");
 
     StatusCode::Ok
 }
 
-#[unsafe(no_mangle)]
+unsafe fn compile_result<'a>(instance: *const Instance) -> &'a CompileResult {
-extern "C" fn haku_pixmap_new(width: u32, height: u32) -> *mut Pixmap {
+    let cr = (*instance).compile_result2.as_ref().unwrap();
-    let ptr = Box::leak(Box::new(
+    cr
-        Pixmap::new(width, height).expect("invalid pixmap size"),
-    )) as *mut _;
-    debug!("created pixmap with size {width}x{height}: {ptr:?}");
-    ptr
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_pixmap_destroy(pixmap: *mut Pixmap) {
+unsafe extern "C" fn haku_num_diagnostics2(instance: *const Instance) -> u32 {
-    debug!("destroying pixmap: {pixmap:?}");
+    (*instance).diagnostics2.len() as u32
-    drop(Box::from_raw(pixmap))
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_pixmap_data(pixmap: *mut Pixmap) -> *mut u8 {
+unsafe extern "C" fn haku_diagnostic_start2(instance: *const Instance, index: u32) -> u32 {
-    let pixmap = &mut *pixmap;
+    (*instance).diagnostics2[index as usize].span().start
-    pixmap.pixels_mut().as_mut_ptr() as *mut u8
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_pixmap_clear(pixmap: *mut Pixmap) {
+unsafe extern "C" fn haku_diagnostic_end2(instance: *const Instance, index: u32) -> u32 {
-    let pixmap = &mut *pixmap;
+    (*instance).diagnostics2[index as usize].span().end
-    pixmap.pixels_mut().fill(PremultipliedColorU8::TRANSPARENT);
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_begin_brush(instance: *mut Instance, brush: *const Brush) -> StatusCode {
+unsafe extern "C" fn haku_diagnostic_message2(instance: *const Instance, index: u32) -> *const u8 {
-    let instance = &mut *instance;
+    (*instance).diagnostics2[index as usize].message().as_ptr()
-    let brush = &*brush;
-
-    let BrushState::Ready(runnable) = &brush.state else {
-        panic!("brush is not compiled and ready to be used");
-    };
-
-    instance.vm.restore_image(&instance.vm_image);
-    instance.vm.apply_defs(&instance.defs);
-    instance.reset_exception();
-    instance.trampoline = None;
-
-    let Ok(closure_id) = instance.vm.create_ref(Ref::Closure(Closure::chunk(
-        runnable.chunk_id,
-        runnable.closure_spec,
-    ))) else {
-        return StatusCode::OutOfRefSlots;
-    };
-
-    instance.reset_exception();
-    let value = match instance.vm.run(&instance.system, closure_id, &[]) {
-        Ok(value) => value,
-        Err(exn) => {
-            instance.set_exception(exn);
-            return StatusCode::EvalException;
-        }
-    };
-    instance.trampoline = Some(Trampoline::new(value));
-
-    StatusCode::Ok
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_cont_kind(instance: *mut Instance) -> Cont {
+unsafe extern "C" fn haku_diagnostic_message_len2(instance: *const Instance, index: u32) -> u32 {
-    let instance = &mut *instance;
+    (*instance).diagnostics2[index as usize].message().len() as u32
-    instance.trampoline.as_ref().unwrap().cont(&instance.vm)
-}
-
-fn wrap_exception(
-    instance: &mut Instance,
-    error_code: StatusCode,
-    f: impl FnOnce(&mut Instance) -> Result<(), Exception>,
-) -> StatusCode {
-    match f(instance) {
-        Ok(_) => StatusCode::Ok,
-        Err(exn) => {
-            instance.set_exception(exn);
-            error_code
-        }
-    }
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_cont_scribble(
+unsafe extern "C" fn haku_defs_len2(instance: *const Instance) -> usize {
-    instance: *mut Instance,
+    compile_result(instance).defs_string.len()
-    pixmap: *mut Pixmap,
-    translation_x: f32,
-    translation_y: f32,
-) -> StatusCode {
-    let instance = &mut *instance;
-    instance.reset_exception();
-
-    debug!("cont_scribble: pixmap={pixmap:?} translation_x={translation_x:?} translation_y={translation_y:?} trampoline={:?}", instance.trampoline);
-
-    wrap_exception(instance, StatusCode::RenderException, |instance| {
-        instance.trampoline.as_mut().unwrap().scribble(
-            &instance.vm,
-            &mut *pixmap,
-            Vec2 {
-                x: translation_x,
-                y: translation_y,
-            },
-            &RendererLimits {
-                pixmap_stack_capacity: instance.limits.pixmap_stack_capacity,
-                transform_stack_capacity: instance.limits.transform_stack_capacity,
-            },
-        )
-    })
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_cont_dotter(
+unsafe extern "C" fn haku_defs2(instance: *const Instance) -> *const u8 {
-    instance: *mut Instance,
+    compile_result(instance).defs_string.as_ptr()
-    from_x: f32,
-    from_y: f32,
-    to_x: f32,
-    to_y: f32,
-    num: f32,
-) -> StatusCode {
-    let instance = &mut *instance;
-    instance.reset_exception();
-
-    debug!(
-        "cont_dotter: from_x={from_x} from_y={from_y} to_x={to_x} to_y={to_y} trampoline={:?}",
-        instance.trampoline
-    );
-
-    wrap_exception(instance, StatusCode::RenderException, |instance| {
-        instance.trampoline.as_mut().unwrap().dotter(
-            &mut instance.vm,
-            &instance.system,
-            Vec2::new(from_x, from_y),
-            Vec2::new(to_x, to_y),
-            num,
-        )
-    })
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_stat_ast_size(brush: *const Brush) -> usize {
+unsafe extern "C" fn haku_tags_len2(instance: *const Instance) -> usize {
-    match &(*brush).state {
+    compile_result(instance).tags_string.len()
-        BrushState::Default => 0,
-        BrushState::Ready(runnable) => runnable.compile_stats.ast_size,
-    }
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_stat_num_refs(instance: *const Instance) -> usize {
+unsafe extern "C" fn haku_tags2(instance: *const Instance) -> *const u8 {
-    (*instance).vm.num_refs()
+    compile_result(instance).tags_string.as_ptr()
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_stat_remaining_fuel(instance: *const Instance) -> usize {
+unsafe extern "C" fn haku_bytecode_len2(instance: *const Instance) -> usize {
-    (*instance).vm.remaining_fuel()
+    compile_result(instance).chunk.bytecode.len()
 }
 
 #[unsafe(no_mangle)]
-unsafe extern "C" fn haku_stat_remaining_memory(instance: *const Instance) -> usize {
+unsafe extern "C" fn haku_bytecode2(instance: *const Instance) -> *const u8 {
-    (*instance).vm.remaining_memory()
+    compile_result(instance).chunk.bytecode.as_ptr()
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_local_count2(instance: *const Instance) -> u8 {
+    compile_result(instance).closure_spec.local_count
 }

crates/haku2/build.rs

@@ -48,7 +48,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         .arg("--cache-dir")
         .arg(out_path.join("zig-cache"))
         .arg("--prefix")
-        .arg(out_path.join("zig-out").join(target))
+        .arg(out_path.join("zig-out"))
         // Build settings
         .arg(format!("-Doptimize={optimize}"))
         .arg(format!("-Dtarget={target}"))
@@ -58,7 +58,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         panic!("zig failed to build");
     }
 
-    println!("cargo::rustc-link-search={out_dir}/zig-out/{target}/lib");
+    println!("cargo::rustc-link-search={out_dir}/zig-out/lib");
     println!("cargo::rustc-link-lib=haku2");
 
     Ok(())

crates/haku2/src/haku2.zig

@@ -10,7 +10,7 @@ const value = @import("value.zig");
 const Vm = @import("vm.zig");
 const log = @import("log.zig");
 
-const debug_logs = false;
+const debug_logs = true;
 
 pub const allocator =
     if (builtin.cpu.arch == .wasm32)
@@ -23,6 +23,16 @@ pub const std_options: std.Options = .{
     .logFn = log.logFn,
 };
 
+// Allocator
+
+export fn haku2_alloc(size: usize, alignment: usize) ?[*]u8 {
+    return allocator.rawAlloc(size, mem.Alignment.fromByteUnits(alignment), @returnAddress());
+}
+
+export fn haku2_free(alloc: [*]u8, size: usize, alignment: usize) void {
+    allocator.rawFree(alloc[0..size], mem.Alignment.fromByteUnits(alignment), @returnAddress());
+}
+
 // Scratch
 
 export fn haku2_scratch_new(max: usize) ?*Scratch {

crates/haku2/src/lib.rs

@@ -9,6 +9,8 @@ use std::{
 
 use log::trace;
 
+pub static WASM: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/zig-out/bin/haku2.wasm"));
+
 #[unsafe(no_mangle)]
 unsafe extern "C" fn __haku2_alloc(size: usize, align: usize) -> *mut u8 {
     if let Ok(layout) = Layout::from_size_align(size, align) {

crates/haku2/src/vm.zig

@@ -60,7 +60,7 @@ pub fn reset(vm: *Vm, fuel: u32) void {
 }
 
 pub fn throw(vm: *Vm, comptime fmt: []const u8, args: anytype) Error {
-    log.debug("throw: fmt={s}", .{fmt});
+    log.info("throw: fmt={s}", .{fmt});
 
     const Args = @TypeOf(args);
     const max_args_size = @sizeOf(@TypeOf(vm.exception.?.args));

crates/rkgk/src/build.rs

@@ -37,6 +37,7 @@ pub fn build(paths: &Paths<'_>, config: &BuildConfig) -> eyre::Result<()> {
         paths.target_dir.join("static/wasm/haku.wasm"),
     )
     .context("cannot copy haku.wasm file")?;
+    write(paths.target_dir.join("static/wasm/haku2.wasm"), haku2::WASM)?;
 
     let import_map = ImportMap::generate("".into(), &config.import_roots);
     write(

crates/rkgk/src/haku.rs

@@ -35,8 +35,7 @@ pub struct Limits {
     pub ref_capacity: usize,
     pub fuel: usize,
     pub memory: usize,
-    pub pixmap_stack_capacity: usize,
+    pub render_max_depth: usize,
-    pub transform_stack_capacity: usize,
 }
 
 pub struct Haku {

rkgk.toml

@@ -114,15 +114,5 @@ fuel = 65536
 # In particular, large arrays use up this memory - such as list backing arrays.
 memory = 1048576
 
-# Capacity of the renderer's pixmap stack.
+# Maximum depth the renderer is allowed to recurse to.
-# The pixmap stack is used for blending layers together within a brush.
+render_max_depth = 256
-# Each (composite)-type scribble requires a single entry on this pixmap stack.
-# In the end, this defines how deep compositing operations may nest.
-pixmap_stack_capacity = 4
-
-# Capacity of the renderer's transformation stack.
-# The transformation stack is used for operations on the transform matrix, such as (translate).
-# To render each transformed operation, a single entry of the transform stack is used.
-# In the end, this defines how deep matrix transform operations may nest.
-transform_stack_capacity = 16
-

static/haku.js

@@ -1,5 +1,16 @@
 let panicImpl;
-let logImpl;
+let logImpl, log2Impl;
+let canvasBeginImpl,
+    canvasLineImpl,
+    canvasRectangleImpl,
+    canvasCircleImpl,
+    canvasFillImpl,
+    canvasStrokeImpl;
+
+function allocCheck(p) {
+    if (p == 0) throw new Error("out of memory");
+    return p;
+}
 
 function makeLogFunction(level) {
     return (length, pMessage) => {
@@ -7,9 +18,17 @@ function makeLogFunction(level) {
     };
 }
 
-let { instance: hakuInstance, module: hakuModule } = await WebAssembly.instantiateStreaming(
+function makeLogFunction2(level) {
-    fetch(HAKU_WASM_PATH),
+    return (pScope, scopeLen, pMsg, len) => {
-    {
+        log2Impl(level, pScope, scopeLen, pMsg, len);
+    };
+}
+
+// NOTE: It may seem tempting to share memory between the two modules, but that's *impossible*.
+// This is because Wasm binaries are not position-independent; addresses of the stack and the heap
+// are hardcoded.
+let [hakuWasm, haku2Wasm] = await Promise.all([
+    WebAssembly.instantiateStreaming(fetch(HAKU_WASM_PATH), {
         env: {
             panic(length, pMessage) {
                 panicImpl(length, pMessage);
@@ -20,17 +39,37 @@ let { instance: hakuInstance, module: hakuModule } = await WebAssembly.instantia
             warn: makeLogFunction("warn"),
             error: makeLogFunction("error"),
         },
-    },
+    }),
-);
+    WebAssembly.instantiateStreaming(fetch(HAKU2_WASM_PATH), {
+        env: {
+            __haku2_log_err: makeLogFunction2("error"),
+            __haku2_log_warn: makeLogFunction2("warn"),
+            __haku2_log_info: makeLogFunction2("info"),
+            __haku2_log_debug: makeLogFunction2("debug"),
 
-let memory = hakuInstance.exports.memory;
+            // TODO: Renderer
-let w = hakuInstance.exports;
+            __haku2_canvas_begin: (c) => canvasBeginImpl(c),
+            __haku2_canvas_line: (c, x1, y1, x2, y2) => canvasLineImpl(c, x1, y1, x2, y2),
+            __haku2_canvas_rectangle: (c, x, y, width, height) =>
+                canvasRectangleImpl(c, x, y, width, height),
+            __haku2_canvas_circle: (c, x, y, r) => canvasCircleImpl(c, x, y, r),
+            __haku2_canvas_fill: (c, r, g, b, a) => canvasFillImpl(c, r, g, b, a),
+            __haku2_canvas_stroke: (c, r, g, b, a, thickness) =>
+                canvasStrokeImpl(c, r, g, b, a, thickness),
+        },
+    }),
+]);
+
+let memory = hakuWasm.instance.exports.memory;
+let w = hakuWasm.instance.exports;
+let memory2 = haku2Wasm.instance.exports.memory;
+let w2 = haku2Wasm.instance.exports;
 
 let textEncoder = new TextEncoder();
 function allocString(string) {
     let size = string.length * 3;
     let align = 1;
-    let pString = w.haku_alloc(size, align);
+    let pString = allocCheck(w.haku_alloc(size, align));
 
     let buffer = new Uint8Array(memory.buffer, pString, size);
     let result = textEncoder.encodeInto(string, buffer);
@@ -48,7 +87,7 @@ function freeString(alloc) {
 }
 
 let textDecoder = new TextDecoder();
-function readString(size, pString) {
+function readString(memory, size, pString) {
     let buffer = new Uint8Array(memory.buffer, pString, size);
     return textDecoder.decode(buffer);
 }
@@ -62,7 +101,36 @@ function readCString(pCString) {
     }
 
     let size = pCursor - pCString;
-    return readString(size, pCString);
+    return readString(memory, size, pCString);
+}
+
+function dup1to2(pHaku1, size, align) {
+    if (size <= 0) {
+        return {
+            ptr: 0,
+            length: 0,
+            size: 0,
+            align: 1,
+        };
+    }
+
+    let pHaku2 = allocCheck(w2.haku2_alloc(size, align));
+
+    let src = new Uint8Array(memory.buffer, pHaku1, size);
+    let dst = new Uint8Array(memory2.buffer, pHaku2, size);
+    dst.set(src);
+
+    return {
+        ptr: pHaku2,
+        length: size,
+        size,
+        align,
+    };
+}
+
+function freeString2(alloc) {
+    if (alloc.ptr == 0) return;
+    w2.haku2_free(alloc.ptr, alloc.size, alloc.align);
 }
 
 class Panic extends Error {
@@ -70,20 +138,34 @@ class Panic extends Error {
 }
 
 panicImpl = (length, pMessage) => {
-    throw new Panic(readString(length, pMessage));
+    throw new Panic(readString(memory, length, pMessage));
 };
 
 logImpl = (level, length, pMessage) => {
-    console[level](readString(length, pMessage));
+    console[level]("h1:", readString(memory, length, pMessage));
 };
 
+log2Impl = (level, pScope, scopeLen, pMsg, len) => {
+    console[level](
+        "h2:",
+        `${readString(memory2, scopeLen, pScope)}: ${readString(memory2, len, pMsg)}`,
+    );
+};
+
+canvasBeginImpl = w.haku_pixmap_begin;
+canvasLineImpl = w.haku_pixmap_line;
+canvasRectangleImpl = w.haku_pixmap_rectangle;
+canvasCircleImpl = w.haku_pixmap_circle;
+canvasFillImpl = w.haku_pixmap_fill;
+canvasStrokeImpl = w.haku_pixmap_stroke;
+
 w.haku_init_logging();
 
 export class Pixmap {
     #pPixmap = 0;
 
     constructor(width, height) {
-        this.#pPixmap = w.haku_pixmap_new(width, height);
+        this.#pPixmap = allocCheck(w.haku_pixmap_new(width, height));
         this.width = width;
         this.height = height;
     }
@@ -113,7 +195,6 @@ export class Pixmap {
     }
 }
 
-// NOTE: This must be kept in sync with ContKind on the haku-wasm side.
 export const ContKind = {
     Scribble: 0,
     Dotter: 1,
@@ -121,53 +202,65 @@ export const ContKind = {
 
 export class Haku {
     #pInstance = 0;
-    #pBrush = 0;
+
-    #brushCode = null;
+    #pLimits2 = 0;
+    #pScratch2 = 0;
+    #pVm2 = 0;
+
+    #bytecode2 = null;
+    #localCount = 0;
+
+    #fuel = 0;
+    #renderMaxDepth = 0;
 
     constructor(limits) {
         console.groupCollapsed("construct Haku");
-
+        {
-        let pLimits = w.haku_limits_new();
+            let pLimits = allocCheck(w.haku_limits_new());
             for (let name of Object.keys(limits)) {
                 w[`haku_limits_set_${name}`](pLimits, limits[name]);
             }
 
-        this.#pInstance = w.haku_instance_new(pLimits);
+            this.#pInstance = allocCheck(w.haku_instance_new(pLimits));
-        this.#pBrush = w.haku_brush_new();
 
             w.haku_limits_destroy(pLimits);
-
+        }
         console.groupEnd();
+
+        // NOTE(v2): VM is not constructed until there is a brush ready
+        this.#pLimits2 = allocCheck(w2.haku2_limits_new());
+        w2.haku2_limits_set_stack_capacity(this.#pLimits2, limits.stack_capacity);
+        w2.haku2_limits_set_call_stack_capacity(this.#pLimits2, limits.call_stack_capacity);
+        this.#fuel = limits.fuel;
+        this.#renderMaxDepth = limits.render_max_depth;
+
+        this.#pScratch2 = allocCheck(w2.haku2_scratch_new(limits.memory));
     }
 
     destroy() {
-        w.haku_brush_destroy(this.#pBrush);
         w.haku_instance_destroy(this.#pInstance);
+
+        w2.haku2_scratch_destroy(this.#pScratch2);
+        w2.haku2_vm_destroy(this.#pVm2);
+        w2.haku2_limits_destroy(this.#pLimits2);
+        w2.haku_dealloc(this.#bytecode2.ptr);
     }
 
     setBrush(code) {
-        w.haku_reset(this.#pInstance);
+        let brushCode = allocString(code);
-        // NOTE: Brush is invalid at this point, because we reset removes all defs and registered chunks.
+        let statusCode = w.haku_compile_brush2(this.#pInstance, brushCode.length, brushCode.ptr);
-
+        freeString(brushCode);
-        if (this.#brushCode != null) freeString(this.#brushCode);
-        this.#brushCode = allocString(code);
-
-        let statusCode = w.haku_compile_brush(
-            this.#pInstance,
-            this.#pBrush,
-            this.#brushCode.length,
-            this.#brushCode.ptr,
-        );
         if (!w.haku_is_ok(statusCode)) {
             if (w.haku_is_diagnostics_emitted(statusCode)) {
                 let diagnostics = [];
-                for (let i = 0; i < w.haku_num_diagnostics(this.#pBrush); ++i) {
+                for (let i = 0; i < w.haku_num_diagnostics2(this.#pInstance); ++i) {
                     diagnostics.push({
-                        start: w.haku_diagnostic_start(this.#pBrush, i),
+                        start: w.haku_diagnostic_start2(this.#pInstance, i),
-                        end: w.haku_diagnostic_end(this.#pBrush, i),
+                        end: w.haku_diagnostic_end2(this.#pInstance, i),
                         message: readString(
-                            w.haku_diagnostic_message_len(this.#pBrush, i),
+                            memory,
-                            w.haku_diagnostic_message(this.#pBrush, i),
+                            w.haku_diagnostic_message_len2(this.#pInstance, i),
+                            w.haku_diagnostic_message2(this.#pInstance, i),
                         ),
                     });
                 }
@@ -185,51 +278,106 @@ export class Haku {
             }
         }
 
+        if (this.#pVm2 != 0) w2.haku2_vm_destroy(this.#pVm2);
+        if (this.#bytecode2 != null) freeString2(this.#bytecode2);
+
+        let pDefsString = dup1to2(
+            w.haku_defs2(this.#pInstance),
+            w.haku_defs_len2(this.#pInstance),
+            1,
+        );
+        let pTagsString = dup1to2(
+            w.haku_tags2(this.#pInstance),
+            w.haku_tags_len2(this.#pInstance),
+            1,
+        );
+        let defs = allocCheck(
+            w2.haku2_defs_parse(
+                pDefsString,
+                w.haku_defs_len2(this.#pInstance),
+                pTagsString,
+                w.haku_tags_len2(this.#pInstance),
+            ),
+        );
+
+        w2.haku2_scratch_reset(this.#pScratch2);
+        this.#pVm2 = allocCheck(w2.haku2_vm_new(this.#pScratch2, defs, this.#pLimits2));
+
+        this.#bytecode2 = dup1to2(
+            w.haku_bytecode2(this.#pInstance),
+            w.haku_bytecode_len2(this.#pInstance),
+            1,
+        );
+        this.#localCount = w.haku_local_count2(this.#pInstance);
+
+        w2.haku2_defs_destroy(defs);
+        freeString2(pDefsString);
+        freeString2(pTagsString);
+
         return { status: "ok" };
     }
 
-    #statusCodeToResultObject(statusCode) {
+    #exceptionMessage() {
-        if (!w.haku_is_ok(statusCode)) {
+        let len = w2.haku2_vm_exception_len(this.#pVm2);
-            if (w.haku_is_exception(statusCode)) {
+        let pExn = allocCheck(w2.haku2_alloc(len, 1));
+        w2.haku2_vm_exception_render(this.#pVm2, pExn);
+        let exn = readString(memory2, len, pExn);
+        w2.haku2_free(pExn, len, 1);
+        return exn;
+    }
+
+    #exceptionResult() {
         return {
             status: "error",
             errorKind: "exception",
-                    description: readCString(w.haku_status_string(statusCode)),
+            description: "Runtime error",
-                    message: readString(
+            message: this.#exceptionMessage(),
-                        w.haku_exception_message_len(this.#pInstance),
-                        w.haku_exception_message(this.#pInstance),
-                    ),
-                };
-            } else {
-                return {
-                    status: "error",
-                    errorKind: "plain",
-                    message: readCString(w.haku_status_string(statusCode)),
         };
     }
+
+    beginBrush() {
+        if (this.#pVm2 == 0) {
+            console.warn("VM instance is not available for drawing");
+            return;
+        }
+
+        w2.haku2_vm_reset(this.#pVm2, this.#fuel);
+        let ok = w2.haku2_vm_run_main(
+            this.#pVm2,
+            this.#pScratch2,
+            this.#bytecode2.ptr,
+            this.#bytecode2.size,
+            this.#localCount,
+        );
+        if (!ok) {
+            return this.#exceptionResult();
+        }
+
+        return { status: "ok" };
+    }
+
+    expectedContKind() {
+        if (w2.haku2_vm_is_dotter(this.#pVm2)) return ContKind.Dotter;
+        else return ContKind.Scribble;
+    }
+
+    contScribble(pixmap, translationX, translationY) {
+        w.haku_pixmap_set_translation(pixmap.ptr, translationX, translationY);
+        let ok = w2.haku2_render(this.#pVm2, pixmap.ptr, this.#renderMaxDepth);
+        if (!ok) {
+            return this.#exceptionResult();
         } else {
             return { status: "ok" };
         }
     }
 
-    beginBrush() {
-        return this.#statusCodeToResultObject(w.haku_begin_brush(this.#pInstance, this.#pBrush));
-    }
-
-    expectedContKind() {
-        return w.haku_cont_kind(this.#pInstance);
-    }
-
-    contScribble(pixmap, translationX, translationY) {
-        return this.#statusCodeToResultObject(
-            w.haku_cont_scribble(this.#pInstance, pixmap.ptr, translationX, translationY),
-        );
-    }
-
     contDotter({ fromX, fromY, toX, toY, num }) {
-        return this.#statusCodeToResultObject(
+        let ok = w2.haku2_vm_run_dotter(this.#pVm2, this.#pScratch2, fromX, fromY, toX, toY, num);
-            w.haku_cont_dotter(this.#pInstance, fromX, fromY, toX, toY, num),
+        if (!ok) {
-        );
+            return this.#exceptionResult();
+        } else {
+            return { status: "ok" };
+        }
     }
 
     async evalBrush(options) {
@@ -239,7 +387,7 @@ export class Haku {
         result = this.beginBrush();
         if (result.status != "ok") return result;
 
-        while (this.expectedContKind() != ContKind.Invalid) {
+        while (true) {
             switch (this.expectedContKind()) {
                 case ContKind.Scribble:
                     result = await runScribble((pixmap, translationX, translationY) => {
@@ -254,27 +402,21 @@ export class Haku {
                     break;
             }
         }
-
-        return { status: "ok" };
     }
 
     get astSize() {
-        if (this.#pBrush != 0) {
+        return 0; // TODO
-            return w.haku_stat_ast_size(this.#pBrush);
-        } else {
-            return 0;
-        }
     }
 
     get numRefs() {
-        return w.haku_stat_num_refs(this.#pInstance);
+        return 0; // TODO
     }
 
     get remainingFuel() {
-        return w.haku_stat_remaining_fuel(this.#pInstance);
+        return 0; // TODO
     }
 
     get remainingMemory() {
-        return w.haku_stat_remaining_memory(this.#pInstance);
+        return 0; // TODO
     }
 }

template/index.hbs.html

@@ -16,6 +16,7 @@
 
         <script>
             const HAKU_WASM_PATH = "{{{ static 'wasm/haku.wasm' }}}";
+            const HAKU2_WASM_PATH = "{{{ static 'wasm/haku2.wasm' }}}";
         </script>
         
         <script type="module" async>