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DSL for WebAssembly
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lib/orb/i32/unsafe_pointer.ex
defmodule Orb.I32.UnsafePointer do
@moduledoc """
Custom `Orb.CustomType` for pointer to a 32-bit integer in memory.
It is aligned to 4 bytes or 32-bits, so you can only load/store at memory offsets divisible by 4.
"""
with @behaviour Orb.CustomType do
@impl Orb.CustomType
def wasm_type, do: :i32
end
def memory_alignment, do: 4
with @behaviour Access do
alias Orb.{Memory, I32, VariableReference}
@impl Access
def fetch(%VariableReference{} = var_ref, at!: offset) do
address =
offset
|> then(&Orb.Numeric.Multiply.optimized(I32, &1, 4))
|> then(&Orb.Numeric.Add.optimized(I32, &1, var_ref))
ast = Memory.load!(I32, address)
{:ok, ast}
end
@impl Access
def get_and_update(_data, _key, _function) do
raise UndefinedFunctionError, module: __MODULE__, function: :get_and_update, arity: 3
end
@impl Access
def pop(_data, _key) do
raise UndefinedFunctionError, module: __MODULE__, function: :pop, arity: 2
end
end
end