485 lines
11 KiB
Ruby
485 lines
11 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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# Simple examples taken from: https://blog.scottlogic.com/2018/04/26/webassembly-by-hand.html
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RSpec.describe 'WAT code generation' do
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let(:mod) { WAG::Module.new }
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subject { mod }
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context 'Basic example' do
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let(:mod) do
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super().build do
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func do
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result(:i32)
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i32.const(42)
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end
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export('helloWorld') do
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func(0)
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end
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end
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end
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describe '#to_wat' do
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subject { mod.to_wat.to_s }
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it { is_expected.to eq '(module (export "helloWorld" (func 0)) (func (result i32) (i32.const 42)))' }
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end
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describe '#to_wasm' do
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subject { mod.to_wasm }
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it { is_expected.to be_valid }
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end
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end
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context 'Game of life example' do
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let(:mod) do
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super().build do
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import('console', 'log') do
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func(:log) do
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param(:i32)
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param(:i32)
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end
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end
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memory(:mem, 1)
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table(16, :funcref)
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elem(0, :dead, :dead, :dead, :alive, :dead, :dead, :dead, :dead,
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:dead, :dead, :dead, :alive, :alive, :dead, :dead, :dead,
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:dead, :dead)
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func(:alive) do
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result(:i32)
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i32.const(1)
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end
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func(:dead) do
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result(:i32)
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i32.const(0)
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end
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func(:offsetFromCoordinate) do
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param(:x, :i32)
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param(:y, :i32)
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result(:i32)
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i32.add do
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i32.mul do
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i32.const(200)
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local.get(:y)
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end
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i32.mul do
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i32.const(4)
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local.get(:x)
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end
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end
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end
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func(:setCell) do
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param(:x, :i32)
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param(:y, :i32)
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param(:value, :i32)
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i32.store do
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call(:offsetFromCoordinate) do
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local.get(:x)
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local.get(:y)
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end
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local.get(:value)
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end
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end
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func(:getCell) do
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param(:x, :i32)
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param(:y, :i32)
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result(:i32)
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if_ do
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result(:i32)
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block do
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result(:i32)
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i32.and do
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call(:inRange) do
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i32.const(0)
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i32.const(50)
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local.get(:x)
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end
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call(:inRange) do
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i32.const(0)
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i32.const(50)
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local.get(:y)
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end
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end
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end
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then_ do
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i32.load8_u do
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call(:offsetFromCoordinate) do
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local.get(:x)
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local.get(:y)
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end
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end
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end
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else_ do
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i32.const(0)
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end
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end
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end
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func(:liveNeighbourCount) do
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param(:x, :i32)
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param(:y, :i32)
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result(:i32)
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i32.const(0)
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# add the cell value from x + 1, y
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call(:isCellAlive) do
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i32.add do
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local.get(:x)
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i32.const(1)
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end
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local.get(:y)
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end
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i32.add
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# add the cell value from x - 1, y
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call(:isCellAlive) do
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i32.add do
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local.get(:x)
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i32.const(-1)
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end
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local.get(:y)
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end
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i32.add
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# add the cell value from x, y - 1
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call(:isCellAlive) do
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local.get(:x)
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i32.add do
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local.get(:y)
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i32.const(-1)
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end
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end
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i32.add
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# add the cell value from x - 1, y - 1
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call(:isCellAlive) do
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i32.add do
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local.get(:x)
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i32.const(-1)
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end
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i32.add do
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local.get(:y)
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i32.const(-1)
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end
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end
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i32.add
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# add the cell value from x + 1, y - 1
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call(:isCellAlive) do
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i32.add do
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local.get(:x)
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i32.const(1)
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end
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i32.add do
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local.get(:y)
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i32.const(-1)
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end
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end
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i32.add
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# add the cell value from x, y + 1
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call(:isCellAlive) do
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local.get(:x)
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i32.add do
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local.get(:y)
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i32.const(1)
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end
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end
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i32.add
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# add the cell value from x - 1, y + 1
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call(:isCellAlive) do
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i32.add do
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local.get(:x)
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i32.const(-1)
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end
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i32.add do
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local.get(:y)
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i32.const(1)
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end
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end
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i32.add
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# add the cell value from x + 1, y + 1
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call(:isCellAlive) do
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i32.add do
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local.get(:x)
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i32.const(1)
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end
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i32.add do
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local.get(:y)
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i32.const(1)
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end
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end
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i32.add
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end
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func(:inRange) do
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param(:low, :i32)
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param(:high, :i32)
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param(:value, :i32)
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result(:i32)
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i32.and do
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i32.ge_s do
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local.get(:value)
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local.get(:low)
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end
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i32.lt_s do
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local.get(:value)
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local.get(:high)
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end
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end
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end
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func(:isCellAlive) do
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param(:x, :i32)
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param(:y, :i32)
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result(:i32)
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i32.and do
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call(:getCell) do
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local.get(:x)
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local.get(:y)
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end
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i32.const(1)
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end
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end
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func(:setCellStateForNextGeneration) do
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param(:x, :i32)
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param(:y, :i32)
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param(:value, :i32)
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call(:setCell) do
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local.get(:x)
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local.get(:y)
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i32.or do
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call(:isCellAlive) do
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local.get(:x)
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local.get(:y)
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end
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i32.shl do
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local.get(:value)
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i32.const(1)
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end
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end
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end
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end
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func(:evolveCellToNextGeneration) do
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param(:x, :i32)
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param(:y, :i32)
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call(:setCellStateForNextGeneration) do
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local.get(:x)
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local.get(:y)
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call_indirect do
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result(:i32)
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i32.or do
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i32.mul do
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i32.const(9)
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call(:isCellAlive) do
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local.get(:x)
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local.get(:y)
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end
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end
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call(:liveNeighbourCount) do
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local.get(:x)
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local.get(:y)
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end
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end
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end
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end
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end
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func(:increment) do
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param(:value, :i32)
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result(:i32)
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i32.add do
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local.get(:value)
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i32.const(1)
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end
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end
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func(:evolveAllCells) do
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local(:x, :i32)
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local(:y, :i32)
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local.set(:x) do
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i32.const(0)
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end
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local.set(:y) do
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i32.const(0)
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end
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block do
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loop_ do
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local.set(:x) do
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i32.const(0)
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end
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block do
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loop_ do
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call(:evolveCellToNextGeneration) do
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local.get(:x)
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local.get(:y)
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end
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local.set(:x) do
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call(:increment) do
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local.get(:x)
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end
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end
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br_if(1) do
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i32.eq do
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local.get(:x)
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i32.const(50)
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end
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end
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br(0)
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end
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end
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local.set(:y) do
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call(:increment) do
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local.get(:y)
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end
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end
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br_if(1) do
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i32.eq do
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local.get(:y)
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i32.const(50)
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end
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end
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br(0)
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end
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end
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end
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func(:promoteNextGeneration) do
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local(:x, :i32)
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local(:y, :i32)
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local.set(:x) do
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i32.const(0)
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end
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local.set(:y) do
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i32.const(0)
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end
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block do
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loop_ do
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local.set(:x) do
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i32.const(0)
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end
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block do
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loop_ do
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call(:setCell) do
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local.get(:x)
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local.get(:y)
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i32.shr_u do
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call(:getCell) do
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local.get(:x)
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local.get(:y)
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end
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i32.const(1)
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end
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end
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local.set(:x) do
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call(:increment) do
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local.get(:x)
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end
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end
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br_if(1) do
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i32.eq do
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local.get(:x)
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i32.const(50)
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end
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end
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br(0)
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end
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end
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local.set(:y) do
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call(:increment) do
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local.get(:y)
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end
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end
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br_if(1) do
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i32.eq do
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local.get(:y)
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i32.const(50)
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end
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end
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br(0)
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end
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end
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end
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func(:tick) do
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call(:evolveAllCells)
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call(:promoteNextGeneration)
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end
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export('tick') do
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func(:tick)
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end
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export('promoteNextGeneration') do
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func(:promoteNextGeneration)
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end
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export('evolveAllCells') do
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func(:evolveAllCells)
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end
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export('evolveCellToNextGeneration') do
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func(:evolveCellToNextGeneration)
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end
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export('setCellStateForNextGeneration') do
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func(:setCellStateForNextGeneration)
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end
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export('isCellAlive') do
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func(:isCellAlive)
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end
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export('inRange') do
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func(:inRange)
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end
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export('offsetFromCoordinate') do
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func(:offsetFromCoordinate)
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end
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export('liveNeighbourCount') do
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func(:liveNeighbourCount)
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end
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export('getCell') do
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func(:getCell)
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end
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export('setCell') do
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func(:setCell)
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end
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export('memory') do
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memory(:mem)
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end
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end
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end
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describe '#to_wasm' do
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subject { mod.to_wasm }
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it { is_expected.to be_valid }
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end
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end
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end
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