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https://github.com/roc-lang/roc.git
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mono: Generate IR for refcount reset procedures
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parent
9b6b81a438
commit
5de539b9fa
@ -830,7 +830,7 @@ impl<'a> WasmBackend<'a> {
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}
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internal_error!(
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"Could not find procedure {:?} with proc_layout {:?}\nKnown procedures: {:#?}",
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"Could not find procedure {:?} with proc_layout:\n{:#?}\nKnown procedures:\n{:#?}",
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func_sym,
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proc_layout,
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self.proc_lookup
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@ -134,7 +134,7 @@ pub fn build_module_without_wrapper<'a>(
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println!("## procs");
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for proc in procs.iter() {
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println!("{}", proc.to_pretty(200));
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println!("{:#?}", proc);
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// println!("{:#?}", proc);
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}
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}
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@ -240,7 +240,7 @@ pub struct WasmDebugLogSettings {
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pub const DEBUG_LOG_SETTINGS: WasmDebugLogSettings = WasmDebugLogSettings {
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proc_start_end: false && cfg!(debug_assertions),
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user_procs_ir: true && cfg!(debug_assertions),
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user_procs_ir: false && cfg!(debug_assertions),
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helper_procs_ir: false && cfg!(debug_assertions),
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let_stmt_ir: false && cfg!(debug_assertions),
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instructions: false && cfg!(debug_assertions),
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@ -77,17 +77,24 @@ pub struct CodeGenHelp<'a> {
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home: ModuleId,
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target_info: TargetInfo,
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layout_isize: Layout<'a>,
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union_refcount: UnionLayout<'a>,
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specializations: Vec<'a, Specialization<'a>>,
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debug_recursion_depth: usize,
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}
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impl<'a> CodeGenHelp<'a> {
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pub fn new(arena: &'a Bump, target_info: TargetInfo, home: ModuleId) -> Self {
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let layout_isize = Layout::usize(target_info);
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// Refcount is a boxed isize. TODO: use the new Box layout when dev backends support it
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let union_refcount = UnionLayout::NonNullableUnwrapped(arena.alloc([layout_isize]));
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CodeGenHelp {
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arena,
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home,
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target_info,
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layout_isize: Layout::usize(target_info),
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layout_isize,
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union_refcount,
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specializations: Vec::with_capacity_in(16, arena),
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debug_recursion_depth: 0,
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}
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@ -227,7 +234,8 @@ impl<'a> CodeGenHelp<'a> {
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let (ret_layout, arg_layouts): (&'a Layout<'a>, &'a [Layout<'a>]) = {
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let arg = self.replace_rec_ptr(ctx, layout);
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match ctx.op {
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Dec | DecRef(_) | Reset => (&LAYOUT_UNIT, self.arena.alloc([arg])),
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Dec | DecRef(_) => (&LAYOUT_UNIT, self.arena.alloc([arg])),
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Reset => (self.arena.alloc(layout), self.arena.alloc([layout])),
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Inc => (&LAYOUT_UNIT, self.arena.alloc([arg, self.layout_isize])),
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Eq => (&LAYOUT_BOOL, self.arena.alloc([arg, arg])),
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}
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@ -349,10 +357,14 @@ impl<'a> CodeGenHelp<'a> {
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arguments: self.arena.alloc([*layout, self.layout_isize]),
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result: LAYOUT_UNIT,
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},
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HelperOp::Dec | HelperOp::Reset => ProcLayout {
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HelperOp::Dec => ProcLayout {
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arguments: self.arena.alloc([*layout]),
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result: LAYOUT_UNIT,
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},
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HelperOp::Reset => ProcLayout {
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arguments: self.arena.alloc([*layout]),
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result: *layout,
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},
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HelperOp::DecRef(_) => unreachable!("No generated Proc for DecRef"),
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HelperOp::Eq => ProcLayout {
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arguments: self.arena.alloc([*layout, *layout]),
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@ -2,6 +2,7 @@ use bumpalo::collections::vec::Vec;
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use roc_builtins::bitcode::IntWidth;
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use roc_module::low_level::{LowLevel, LowLevel::*};
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use roc_module::symbol::{IdentIds, Symbol};
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use roc_target::PtrWidth;
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use crate::code_gen_help::let_lowlevel;
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use crate::ir::{
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@ -13,9 +14,11 @@ use super::{CodeGenHelp, Context, HelperOp};
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const LAYOUT_BOOL: Layout = Layout::Builtin(Builtin::Bool);
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const LAYOUT_UNIT: Layout = Layout::UNIT;
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const LAYOUT_PTR: Layout = Layout::RecursivePointer;
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const LAYOUT_U32: Layout = Layout::Builtin(Builtin::Int(IntWidth::U32));
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// TODO: Replace usages with root.union_refcount
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const LAYOUT_PTR: Layout = Layout::RecursivePointer;
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pub fn refcount_stmt<'a>(
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root: &mut CodeGenHelp<'a>,
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ident_ids: &mut IdentIds,
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@ -135,31 +138,177 @@ pub fn refcount_reset_proc_body<'a>(
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layout: Layout<'a>,
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structure: Symbol,
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) -> Stmt<'a> {
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// Reset is a fancy Decrement. When we recurse into child layouts we just want Dec.
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let rc_ptr = root.create_symbol(ident_ids, "rc_ptr");
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let rc = root.create_symbol(ident_ids, "rc");
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let refcount_1 = root.create_symbol(ident_ids, "refcount_1");
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let is_unique = root.create_symbol(ident_ids, "is_unique");
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let union_layout = match layout {
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Layout::Union(u) => u,
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_ => unimplemented!("Reset is only implemented for UnionLayout"),
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};
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// Whenever we recurse into a child layout we will want to Decrement
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ctx.op = HelperOp::Dec;
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ctx.recursive_union = Some(union_layout);
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/*
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assert layout is union
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create the context, with op=Dec
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// Reset structure is unique. Decrement its children and return a pointer to the allocation.
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let then_stmt = {
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use UnionLayout::*;
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load the rc value
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- do I have a helper for this?
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let isUnique = lowlevel Eq rc refcount_unique
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switch
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True => {
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refcount union contents
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ret structure
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}
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False => {
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call specialized op Dec
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let zero = 0
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let typed_null = lowlevel PtrCast zero
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ret typed_null
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}
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*/
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let tag_layouts;
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let mut null_id = None;
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match union_layout {
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NonRecursive(tags) => {
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tag_layouts = tags;
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}
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Recursive(tags) => {
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tag_layouts = tags;
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}
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NonNullableUnwrapped(field_layouts) => {
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tag_layouts = root.arena.alloc([field_layouts]);
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}
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NullableWrapped {
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other_tags: tags,
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nullable_id,
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} => {
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null_id = Some(nullable_id);
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tag_layouts = tags;
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}
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NullableUnwrapped {
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other_fields,
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nullable_id,
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} => {
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null_id = Some(nullable_id as TagIdIntType);
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tag_layouts = root.arena.alloc([other_fields]);
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}
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};
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todo!()
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let tag_id_layout = union_layout.tag_id_layout();
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let tag_id_sym = root.create_symbol(ident_ids, "tag_id");
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let tag_id_stmt = |next| {
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Stmt::Let(
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tag_id_sym,
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Expr::GetTagId {
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structure,
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union_layout,
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},
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tag_id_layout,
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next,
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)
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};
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let rc_contents_stmt = refcount_union_contents(
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root,
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ident_ids,
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ctx,
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union_layout,
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tag_layouts,
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null_id,
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structure,
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tag_id_sym,
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tag_id_layout,
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Stmt::Ret(structure),
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);
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tag_id_stmt(root.arena.alloc(
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//
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rc_contents_stmt,
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))
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};
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// Reset structure is not unique. Decrement it and return a NULL pointer.
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let else_stmt = {
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let decrement_unit = root.create_symbol(ident_ids, "decrement_unit");
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let decrement_expr = root
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.call_specialized_op(ident_ids, ctx, layout, root.arena.alloc([structure]))
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.unwrap();
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let decrement_stmt = |next| Stmt::Let(decrement_unit, decrement_expr, LAYOUT_UNIT, next);
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// Zero
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let zero = root.create_symbol(ident_ids, "zero");
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let zero_expr = Expr::Literal(Literal::Int(0));
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let zero_stmt = |next| Stmt::Let(zero, zero_expr, root.layout_isize, next);
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// Null pointer with union layout
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let null = root.create_symbol(ident_ids, "null");
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let null_stmt =
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|next| let_lowlevel(root.arena, root.layout_isize, null, PtrCast, &[zero], next);
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decrement_stmt(root.arena.alloc(
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//
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zero_stmt(root.arena.alloc(
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//
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null_stmt(root.arena.alloc(
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//
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Stmt::Ret(null),
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)),
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)),
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))
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};
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let if_stmt = Stmt::Switch {
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cond_symbol: is_unique,
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cond_layout: LAYOUT_BOOL,
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branches: root.arena.alloc([(1, BranchInfo::None, then_stmt)]),
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default_branch: (BranchInfo::None, root.arena.alloc(else_stmt)),
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ret_layout: layout,
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};
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// Uniqueness test
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let is_unique_stmt = {
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let_lowlevel(
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root.arena,
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LAYOUT_BOOL,
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is_unique,
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Eq,
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&[rc, refcount_1],
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root.arena.alloc(if_stmt),
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)
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};
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// Constant for unique refcount
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let refcount_1_encoded = match root.target_info.ptr_width() {
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PtrWidth::Bytes4 => i32::MIN as i128,
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PtrWidth::Bytes8 => i64::MIN as i128,
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};
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let refcount_1_expr = Expr::Literal(Literal::Int(refcount_1_encoded));
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let refcount_1_stmt = Stmt::Let(
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refcount_1,
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refcount_1_expr,
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root.layout_isize,
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root.arena.alloc(is_unique_stmt),
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);
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// Refcount value
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let rc_expr = Expr::UnionAtIndex {
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structure: rc_ptr,
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tag_id: 0,
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union_layout: root.union_refcount,
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index: 0,
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};
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let rc_stmt = Stmt::Let(
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rc,
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rc_expr,
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root.layout_isize,
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root.arena.alloc(refcount_1_stmt),
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);
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// Refcount pointer
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let rc_ptr_stmt = {
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rc_ptr_from_data_ptr(
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root,
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ident_ids,
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structure,
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rc_ptr,
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union_layout.stores_tag_id_in_pointer(root.target_info),
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root.arena.alloc(rc_stmt),
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)
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};
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rc_ptr_stmt
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}
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// Check if refcounting is implemented yet. In the long term, this will be deleted.
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@ -928,9 +1077,9 @@ fn refcount_union_contents<'a>(
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structure: Symbol,
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tag_id_sym: Symbol,
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tag_id_layout: Layout<'a>,
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modify_union_stmt: Stmt<'a>,
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next_stmt: Stmt<'a>,
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) -> Stmt<'a> {
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let jp_modify_union = JoinPointId(root.create_symbol(ident_ids, "jp_modify_union"));
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let jp_contents_modified = JoinPointId(root.create_symbol(ident_ids, "jp_contents_modified"));
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let mut tag_branches = Vec::with_capacity_in(tag_layouts.len() + 1, root.arena);
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if let Some(id) = null_id {
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@ -949,7 +1098,7 @@ fn refcount_union_contents<'a>(
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// After refcounting the fields, jump to modify the union itself
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// (Order is important, to avoid use-after-free for Dec)
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let following = Stmt::Jump(jp_modify_union, &[]);
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let following = Stmt::Jump(jp_contents_modified, &[]);
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let fields_stmt = refcount_tag_fields(
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root,
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@ -978,9 +1127,9 @@ fn refcount_union_contents<'a>(
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};
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Stmt::Join {
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id: jp_modify_union,
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id: jp_contents_modified,
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parameters: &[],
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body: root.arena.alloc(modify_union_stmt),
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body: root.arena.alloc(next_stmt),
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remainder: root.arena.alloc(tag_id_switch),
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}
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}
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