Grcov report - delete

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//! `DELETE-ENTITY` codegen. Takes an entity index, reads the

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//! `entity_type` byte at the entity's header offset, and routes

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//! through the layout serializer to emit a delete-record entry in the

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//! output stream.

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use crate::ast::{Expr, WasmType};

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use crate::compiler::context::CompileContext;

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use crate::compiler::emit::FunctionEmitter;

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use crate::compiler::expr::LOCAL_TEMP_I32;

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use crate::error::Result;

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use crate::runtime::SymbolTable;

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use super::{arity_check, compile_idx_to_stack, emit_entity_header_offset};

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pub(super) fn delete_entity(_symbols: &mut SymbolTable, args: &[Expr]) -> Result<Expr> {

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    arity_check("DELETE-ENTITY", args, 1)?;

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    Ok(Expr::Nil)

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pub(super) fn compile_delete_entity(

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    ctx: &mut CompileContext,

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    emit: &mut FunctionEmitter,

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    symbols: &mut SymbolTable,

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    args: &[Expr],

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) -> Result<()> {

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    arity_check("DELETE-ENTITY", args, 1)?;

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    compile_idx_to_stack(ctx, emit, symbols, &args[0])?;

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    let temp = LOCAL_TEMP_I32;

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    emit_entity_header_offset(ctx, emit, temp)?;

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    let header_local = ctx.alloc_local(WasmType::I32)?;

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    emit.local_set(header_local);

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    // Read entity_type from input header

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    let type_local = ctx.alloc_local(WasmType::I32)?;

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    emit.local_get(header_local);

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    emit.i32_load8_u(0);

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    emit.local_set(type_local);

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    ctx.serializer()

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        .write_delete_entity(emit, type_local, header_local);

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    Ok(())

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