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expressionrunner.js
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/
expressionrunner.js
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var Flags = binaryen.ExpressionRunner.Flags;
console.log("// ExpressionRunner.Flags.Default = " + Flags.Default);
console.log("// ExpressionRunner.Flags.PreserveSideeffects = " + Flags.PreserveSideeffects);
console.log("// ExpressionRunner.Flags.TraverseCalls = " + Flags.TraverseCalls);
function assertDeepEqual(x, y) {
if (typeof x === "object") {
for (let i in x) assertDeepEqual(x[i], y[i]);
for (let i in y) assertDeepEqual(x[i], y[i]);
} else {
assert(x === y);
}
}
var module = new binaryen.Module();
module.addGlobal("aGlobal", binaryen.i32, true, module.i32.const(0));
// Should evaluate down to a constant
var runner = new binaryen.ExpressionRunner(module);
var expr = runner.runAndDispose(
module.i32.add(
module.i32.const(1),
module.i32.const(2)
)
);
assertDeepEqual(
binaryen.getExpressionInfo(expr),
{
id: binaryen.ExpressionIds.Const,
type: binaryen.i32,
value: 3
}
);
// Should traverse control structures
runner = new binaryen.ExpressionRunner(module);
expr = runner.runAndDispose(
module.i32.add(
module.i32.const(1),
module.if(
module.i32.const(0),
module.i32.const(0),
module.i32.const(3)
)
),
);
assertDeepEqual(
binaryen.getExpressionInfo(expr),
{
id: binaryen.ExpressionIds.Const,
type: binaryen.i32,
value: 4
}
);
// Should be unable to evaluate a local if not explicitly specified
runner = new binaryen.ExpressionRunner(module);
expr = runner.runAndDispose(
module.i32.add(
module.local.get(0, binaryen.i32),
module.i32.const(1)
)
);
assert(expr === 0);
// Should handle traps properly
runner = new binaryen.ExpressionRunner(module);
expr = runner.runAndDispose(
module.unreachable()
);
assert(expr === 0);
// Should ignore `local.tee` side-effects if just evaluating the expression
runner = new binaryen.ExpressionRunner(module);
expr = runner.runAndDispose(
module.i32.add(
module.local.tee(0, module.i32.const(4), binaryen.i32),
module.i32.const(1)
)
);
assertDeepEqual(
binaryen.getExpressionInfo(expr),
{
id: binaryen.ExpressionIds.Const,
type: binaryen.i32,
value: 5
}
);
// Should preserve any side-effects if explicitly requested
runner = new binaryen.ExpressionRunner(module, Flags.PreserveSideeffects);
expr = runner.runAndDispose(
module.i32.add(
module.local.tee(0, module.i32.const(4), binaryen.i32),
module.i32.const(1)
)
);
assert(expr === 0);
// Should work with temporary values if just evaluating the expression
runner = new binaryen.ExpressionRunner(module);
expr = runner.runAndDispose(
module.i32.add(
module.block(null, [
module.local.set(0, module.i32.const(2)),
module.local.get(0, binaryen.i32)
], binaryen.i32),
module.block(null, [
module.global.set("aGlobal", module.i32.const(4)),
module.global.get("aGlobal", binaryen.i32)
], binaryen.i32)
)
);
assertDeepEqual(
binaryen.getExpressionInfo(expr),
{
id: binaryen.ExpressionIds.Const,
type: binaryen.i32,
value: 6
}
);
// Should pick up explicitly preset values
runner = new binaryen.ExpressionRunner(module, Flags.PreserveSideeffects);
assert(runner.setLocalValue(0, module.i32.const(3)));
assert(runner.setGlobalValue("aGlobal", module.i32.const(4)));
expr = runner.runAndDispose(
module.i32.add(
module.local.get(0, binaryen.i32),
module.global.get("aGlobal", binaryen.i32)
)
);
assertDeepEqual(
binaryen.getExpressionInfo(expr),
{
id: binaryen.ExpressionIds.Const,
type: binaryen.i32,
value: 7
}
);
// Should traverse into (simple) functions if requested
runner = new binaryen.ExpressionRunner(module, Flags.TraverseCalls);
module.addFunction("add", binaryen.createType([ binaryen.i32, binaryen.i32 ]), binaryen.i32, [],
module.block(null, [
module.i32.add(
module.local.get(0, binaryen.i32),
module.local.get(1, binaryen.i32)
)
], binaryen.i32)
);
assert(runner.setLocalValue(0, module.i32.const(1)));
expr = runner.runAndDispose(
module.i32.add(
module.i32.add(
module.local.get(0, binaryen.i32),
module.call("add", [
module.i32.const(2),
module.i32.const(4)
], binaryen.i32)
),
module.local.get(0, binaryen.i32)
)
);
assertDeepEqual(
binaryen.getExpressionInfo(expr),
{
id: binaryen.ExpressionIds.Const,
type: binaryen.i32,
value: 8
}
);
// Should not attempt to traverse into functions if not explicitly set
runner = new binaryen.ExpressionRunner(module);
expr = runner.runAndDispose(
module.i32.add(
module.i32.const(1),
module.call("add", [
module.i32.const(3),
module.i32.const(4)
], binaryen.i32)
)
);
assert(expr === 0);
// Should stop on maxDepth
runner = new binaryen.ExpressionRunner(module, Flags.Default, 1);
expr = runner.runAndDispose(
module.block(null, [
module.i32.const(1),
], binaryen.i32)
);
assert(expr === 0);
// Should not loop infinitely
runner = new binaryen.ExpressionRunner(module, Flags.Default, 50, 3);
expr = runner.runAndDispose(
module.loop("theLoop",
module.br("theLoop")
)
);
assert(expr === 0);
module.dispose();