remove Boxed

cli/src/repl/eval.rs

@@ -73,7 +73,6 @@ fn jit_to_ast_help<'a>(
     content: &Content,
 ) -> Result<Expr<'a>, ToAstProblem> {
     match layout {
-        Layout::Boxed(_) => todo!(),
         Layout::Builtin(Builtin::Int1) => Ok(run_jit_function!(lib, main_fn_name, bool, |num| {
             bool_to_ast(env, num, content)
         })),

compiler/gen_llvm/src/llvm/build.rs

@@ -2495,32 +2495,7 @@ pub fn build_exp_stmt<'a, 'ctx, 'env>(
                 Dec(symbol) => {
                     let (value, layout) = load_symbol_and_layout(scope, symbol);
 
-                    if let Layout::Boxed(_) = layout {
-                        if value.is_pointer_value() {
-                            let value_ptr = value.into_pointer_value();
-
-                            let then_block = env.context.append_basic_block(parent, "then");
-                            let done_block = env.context.append_basic_block(parent, "done");
-
-                            let condition =
-                                env.builder.build_is_not_null(value_ptr, "box_is_not_null");
-                            env.builder
-                                .build_conditional_branch(condition, then_block, done_block);
-
-                            {
-                                env.builder.position_at_end(then_block);
-                                let refcount_ptr =
-                                    PointerToRefcount::from_ptr_to_data(env, value_ptr);
-                                refcount_ptr.decrement(env, layout);
-
-                                env.builder.build_unconditional_branch(done_block);
-                            }
-
-                            env.builder.position_at_end(done_block);
-                        } else {
-                            eprint!("we're likely leaking memory; see issue #985 for details");
-                        }
-                    } else if layout.contains_refcounted() {
+                    if layout.contains_refcounted() {
                         decrement_refcount_layout(env, parent, layout_ids, value, layout);
                     }
 
@@ -2562,11 +2537,26 @@ pub fn build_exp_stmt<'a, 'ctx, 'env>(
 
                         _ if layout.is_refcounted() => {
                             if value.is_pointer_value() {
-                                // BasicValueEnum::PointerValue(value_ptr) => {
                                 let value_ptr = value.into_pointer_value();
-                                let refcount_ptr =
-                                    PointerToRefcount::from_ptr_to_data(env, value_ptr);
-                                refcount_ptr.decrement(env, layout);
+
+                                let then_block = env.context.append_basic_block(parent, "then");
+                                let done_block = env.context.append_basic_block(parent, "done");
+
+                                let condition =
+                                    env.builder.build_is_not_null(value_ptr, "box_is_not_null");
+                                env.builder
+                                    .build_conditional_branch(condition, then_block, done_block);
+
+                                {
+                                    env.builder.position_at_end(then_block);
+                                    let refcount_ptr =
+                                        PointerToRefcount::from_ptr_to_data(env, value_ptr);
+                                    refcount_ptr.decrement(env, layout);
+
+                                    env.builder.build_unconditional_branch(done_block);
+                                }
+
+                                env.builder.position_at_end(done_block);
                             } else {
                                 eprint!("we're likely leaking memory; see issue #985 for details");
                             }

compiler/gen_llvm/src/llvm/build_hash.rs

@@ -45,7 +45,6 @@ fn build_hash_layout<'a, 'ctx, 'env>(
     when_recursive: WhenRecursive<'a>,
 ) -> IntValue<'ctx> {
     match layout {
-        Layout::Boxed(_) => todo!(),
         Layout::Builtin(builtin) => {
             hash_builtin(env, layout_ids, seed, val, layout, builtin, when_recursive)
         }

compiler/gen_llvm/src/llvm/compare.rs

@@ -139,7 +139,6 @@ fn build_eq<'a, 'ctx, 'env>(
     }
 
     match lhs_layout {
-        Layout::Boxed(_) => todo!(),
         Layout::Builtin(builtin) => {
             build_eq_builtin(env, layout_ids, lhs_val, rhs_val, builtin, when_recursive)
         }
@@ -297,7 +296,6 @@ fn build_neq<'a, 'ctx, 'env>(
     }
 
     match lhs_layout {
-        Layout::Boxed(_) => todo!(),
         Layout::Builtin(builtin) => {
             build_neq_builtin(env, layout_ids, lhs_val, rhs_val, builtin, when_recursive)
         }

compiler/gen_llvm/src/llvm/convert.rs

@@ -79,14 +79,6 @@ pub fn basic_type_from_layout<'a, 'ctx, 'env>(
                 .as_basic_type_enum()
         }
 
-        Boxed(_) => {
-            // TODO make this dynamic
-            env.context
-                .i64_type()
-                .ptr_type(AddressSpace::Generic)
-                .as_basic_type_enum()
-        }
-
         Builtin(builtin) => basic_type_from_builtin(env, builtin),
     }
 }

compiler/gen_llvm/src/llvm/refcounting.rs

@@ -752,10 +752,6 @@ fn modify_refcount_layout_build_function<'a, 'ctx, 'env>(
                 Some(function)
             }
         },
-        Layout::Boxed(_) => {
-            // TODO
-            todo!()
-        }
     }
 }
 

compiler/mono/src/alias_analysis.rs

@@ -972,7 +972,6 @@ fn layout_spec(builder: &mut FuncDefBuilder, layout: &Layout) -> Result<TypeId>
             } => worst_case_type(builder),
         },
         RecursivePointer => worst_case_type(builder),
-        Boxed(_) => worst_case_type(builder),
         Closure(_, lambda_set, _) => layout_spec(builder, &lambda_set.runtime_representation()),
     }
 }

compiler/mono/src/inc_dec.rs

@@ -154,6 +154,7 @@ struct VarInfo {
     reference: bool,  // true if the variable may be a reference (aka pointer) at runtime
     persistent: bool, // true if the variable is statically known to be marked a Persistent at runtime
     consume: bool,    // true if the variable RC must be "consumed"
+    reset: bool,      // true if the variable is the result of a Reset operation
 }
 
 type VarMap = MutMap<Symbol, VarInfo>;
@@ -254,6 +255,7 @@ impl<'a> Context<'a> {
                         reference: false, // assume function symbols are global constants
                         persistent: true, // assume function symbols are global constants
                         consume: false,   // no need to consume this variable
+                        reset: false,     // reset symbols cannot be passed as function arguments
                     },
                 );
             }
@@ -310,7 +312,12 @@ impl<'a> Context<'a> {
             return stmt;
         }
 
-        let modify = ModifyRc::Dec(symbol);
+        let modify = if info.reset {
+            ModifyRc::DecRef(symbol)
+        } else {
+            ModifyRc::Dec(symbol)
+        };
+
         self.arena.alloc(Stmt::Refcounting(modify, stmt))
     }
 
@@ -812,7 +819,7 @@ impl<'a> Context<'a> {
         // must this value be consumed?
         let consume = consume_call(&self.vars, call);
 
-        self.update_var_info_help(symbol, layout, persistent, consume)
+        self.update_var_info_help(symbol, layout, persistent, consume, false)
     }
 
     fn update_var_info(&self, symbol: Symbol, layout: &Layout<'a>, expr: &Expr<'a>) -> Self {
@@ -823,7 +830,9 @@ impl<'a> Context<'a> {
         // must this value be consumed?
         let consume = consume_expr(&self.vars, expr);
 
-        self.update_var_info_help(symbol, layout, persistent, consume)
+        let reset = matches!(expr, Expr::Reset(_));
+
+        self.update_var_info_help(symbol, layout, persistent, consume, reset)
     }
 
     fn update_var_info_help(
@@ -832,6 +841,7 @@ impl<'a> Context<'a> {
         layout: &Layout<'a>,
         persistent: bool,
         consume: bool,
+        reset: bool,
     ) -> Self {
         // should we perform incs and decs on this value?
         let reference = layout.contains_refcounted();
@@ -840,6 +850,7 @@ impl<'a> Context<'a> {
             reference,
             persistent,
             consume,
+            reset,
         };
 
         let mut ctx = self.clone();
@@ -857,6 +868,7 @@ impl<'a> Context<'a> {
                 reference: p.layout.contains_refcounted(),
                 consume: !p.borrow,
                 persistent: false,
+                reset: false,
             };
             ctx.vars.insert(p.symbol, info);
         }

compiler/mono/src/layout.rs

@@ -44,8 +44,6 @@ pub enum Layout<'a> {
     Union(UnionLayout<'a>),
     RecursivePointer,
 
-    Boxed(&'a Layout<'a>),
-
     /// A function. The types of its arguments, then the type of its return value.
     Closure(&'a [Layout<'a>], LambdaSet<'a>, &'a Layout<'a>),
 }
@@ -599,7 +597,6 @@ impl<'a> Layout<'a> {
                 // We cannot memcpy pointers, because then we would have the same pointer in multiple places!
                 false
             }
-            Boxed(_) => false,
         }
     }
 
@@ -651,7 +648,6 @@ impl<'a> Layout<'a> {
             }
             Closure(_, lambda_set, _) => lambda_set.stack_size(pointer_size),
             RecursivePointer => pointer_size,
-            Boxed(_) => pointer_size,
         }
     }
 
@@ -682,7 +678,6 @@ impl<'a> Layout<'a> {
             }
             Layout::Builtin(builtin) => builtin.alignment_bytes(pointer_size),
             Layout::RecursivePointer => pointer_size,
-            Layout::Boxed(_) => pointer_size,
             Layout::Closure(_, captured, _) => {
                 pointer_size.max(captured.alignment_bytes(pointer_size))
             }
@@ -704,7 +699,6 @@ impl<'a> Layout<'a> {
             }
 
             RecursivePointer => true,
-            Boxed(_) => true,
 
             Builtin(List(_)) | Builtin(Str) => true,
 
@@ -738,11 +732,6 @@ impl<'a> Layout<'a> {
             }
             RecursivePointer => true,
 
-            Boxed(_) => {
-                // technically we should look at layout of the box's content
-                // but refcount insertion needs this to return true
-                true
-            }
             Closure(_, closure_layout, _) => closure_layout.contains_refcounted(),
         }
     }
@@ -767,7 +756,6 @@ impl<'a> Layout<'a> {
             }
             Union(union_layout) => union_layout.to_doc(alloc, parens),
             RecursivePointer => alloc.text("*self"),
-            Boxed(_) => alloc.text("unbox"),
             Closure(args, closure_layout, result) => {
                 let args_doc = args.iter().map(|x| x.to_doc(alloc, Parens::InFunction));
 

compiler/mono/src/reset_reuse.rs

@@ -212,7 +212,7 @@ fn try_function_s<'a, 'i>(
     if std::ptr::eq(stmt, new_stmt) || stmt == new_stmt {
         stmt
     } else {
-        insert_reset(env, w, x, new_stmt)
+        insert_reset(env, w, x, c.layout, new_stmt)
     }
 }
 
@@ -220,6 +220,7 @@ fn insert_reset<'a>(
     env: &mut Env<'a, '_>,
     w: Symbol,
     x: Symbol,
+    union_layout: UnionLayout<'a>,
     mut stmt: &'a Stmt<'a>,
 ) -> &'a Stmt<'a> {
     use crate::ir::Expr::*;
@@ -246,11 +247,11 @@ fn insert_reset<'a>(
 
     let reset_expr = Expr::Reset(x);
 
-    const I64: Layout<'static> = Layout::Builtin(crate::layout::Builtin::Int64);
+    // const I64: Layout<'static> = Layout::Builtin(crate::layout::Builtin::Int64);
 
-    stmt = env
-        .arena
-        .alloc(Stmt::Let(w, reset_expr, Layout::Boxed(&I64), stmt));
+    let layout = Layout::Union(union_layout);
+
+    stmt = env.arena.alloc(Stmt::Let(w, reset_expr, layout, stmt));
 
     for (symbol, expr, expr_layout) in stack.into_iter().rev() {
         stmt = env