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load(libdir + "wasm.js");
// Single-step profiling currently only works in the ARM simulator
if (!getBuildConfiguration()["arm-simulator"])
quit();
const Module = WebAssembly.Module;
const Instance = WebAssembly.Instance;
const Table = WebAssembly.Table;
function normalize(stack)
{
var wasmFrameTypes = [
{re:/^entry trampoline \(in asm.js\)$/, sub:">"},
{re:/^wasm-function\[(\d+)\] \(.*\)$/, sub:"$1"},
{re:/^(fast|slow) FFI trampoline \(in asm.js\)$/, sub:"<"},
{re:/ \(in asm.js\)$/, sub:""}
];
var framesIn = stack.split(',');
var framesOut = [];
for (let frame of framesIn) {
for (let {re, sub} of wasmFrameTypes) {
if (re.test(frame)) {
framesOut.push(frame.replace(re, sub));
break;
}
}
}
return framesOut.join(',');
}
function removeAdjacentDuplicates(array) {
if (array.length < 2)
return;
let i = 0;
for (let j = 1; j < array.length; j++) {
if (array[i] !== array[j])
array[++i] = array[j];
}
array.length = i + 1;
}
function assertEqStacks(got, expect)
{
for (let i = 0; i < got.length; i++)
got[i] = normalize(got[i]);
removeAdjacentDuplicates(got);
if (got.length != expect.length) {
print(`Got:\n${got.toSource()}\nExpect:\n${expect.toSource()}`);
assertEq(got.length, expect.length);
}
for (let i = 0; i < got.length; i++) {
if (got[i] !== expect[i]) {
print(`On stack ${i}, Got:\n${got[i]}\nExpect:\n${expect[i]}`);
assertEq(got[i], expect[i]);
}
}
}
function test(code, importObj, expect)
{
enableSPSProfiling();
var f = wasmEvalText(code, importObj).exports[""];
enableSingleStepProfiling();
f();
assertEqStacks(disableSingleStepProfiling(), expect);
disableSPSProfiling();
}
test(
`(module
(func (result i32) (i32.const 42))
(export "" 0)
)`,
{},
["", ">", "0,>", ">", ""]);
test(
`(module
(func (result i32) (i32.add (call 1) (i32.const 1)))
(func (result i32) (i32.const 42))
(export "" 0)
)`,
{},
["", ">", "0,>", "1,0,>", "0,>", ">", ""]);
test(
`(module
(func $foo (call_indirect 0 (i32.const 0)))
(func $bar)
(table anyfunc (elem $bar))
(export "" $foo)
)`,
{},
["", ">", "0,>", "1,0,>", "0,>", ">", ""]);
test(
`(module
(import $foo "" "foo")
(table anyfunc (elem $foo))
(func $bar (call_indirect 0 (i32.const 0)))
(export "" $bar)
)`,
{"":{foo:()=>{}}},
["", ">", "1,>", "0,1,>", "<,0,1,>", "0,1,>", "1,>", ">", ""]);
function testError(code, error, expect)
{
enableSPSProfiling();
var f = wasmEvalText(code).exports[""];
enableSingleStepProfiling();
assertThrowsInstanceOf(f, error);
assertEqStacks(disableSingleStepProfiling(), expect);
disableSPSProfiling();
}
testError(
`(module
(func $foo (unreachable))
(func (export "") (call $foo))
)`,
WebAssembly.RuntimeError,
["", ">", "1,>", "0,1,>", "trap handling,0,1,>", "inline stub,0,1,>", ""]);
testError(
`(module
(type $good (func))
(type $bad (func (param i32)))
(func $foo (call_indirect $bad (i32.const 1) (i32.const 0)))
(func $bar (type $good))
(table anyfunc (elem $bar))
(export "" $foo)
)`,
WebAssembly.RuntimeError,
// Technically we have this one *one-instruction* interval where
// the caller is lost (the stack with "1,>"). It's annoying to fix and shouldn't
// mess up profiles in practice so we ignore it.
["", ">", "0,>", "1,0,>", "1,>", "trap handling,0,>", "inline stub,0,>", ""]);
(function() {
var e = wasmEvalText(`
(module
(func $foo (result i32) (i32.const 42))
(export "foo" $foo)
(func $bar (result i32) (i32.const 13))
(table 10 anyfunc)
(elem (i32.const 0) $foo $bar)
(export "tbl" table)
)`).exports;
assertEq(e.foo(), 42);
assertEq(e.tbl.get(0)(), 42);
assertEq(e.tbl.get(1)(), 13);
enableSPSProfiling();
enableSingleStepProfiling();
assertEq(e.tbl.get(0)(), 42);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "0,>", ">", ""]);
disableSPSProfiling();
assertEq(e.foo(), 42);
assertEq(e.tbl.get(0)(), 42);
assertEq(e.tbl.get(1)(), 13);
enableSPSProfiling();
enableSingleStepProfiling();
assertEq(e.tbl.get(1)(), 13);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "1,>", ">", ""]);
disableSPSProfiling();
assertEq(e.tbl.get(0)(), 42);
assertEq(e.tbl.get(1)(), 13);
assertEq(e.foo(), 42);
enableSPSProfiling();
enableSingleStepProfiling();
assertEq(e.foo(), 42);
assertEq(e.tbl.get(1)(), 13);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "0,>", ">", "", ">", "1,>", ">", ""]);
disableSPSProfiling();
var e2 = wasmEvalText(`
(module
(type $v2i (func (result i32)))
(import "a" "b" (table 10 anyfunc))
(elem (i32.const 2) $bar)
(func $bar (result i32) (i32.const 99))
(func $baz (param $i i32) (result i32) (call_indirect $v2i (get_local $i)))
(export "baz" $baz)
)`, {a:{b:e.tbl}}).exports;
enableSPSProfiling();
enableSingleStepProfiling();
assertEq(e2.baz(0), 42);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "1,>", "0,1,>", "1,>", ">", ""]);
disableSPSProfiling();
enableSPSProfiling();
enableSingleStepProfiling();
assertEq(e2.baz(1), 13);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "1,>", "1,1,>", "1,>", ">", ""]);
disableSPSProfiling();
enableSPSProfiling();
enableSingleStepProfiling();
assertEq(e2.baz(2), 99);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "1,>", "0,1,>", "1,>", ">", ""]);
disableSPSProfiling();
})();
(function() {
var m1 = new Module(wasmTextToBinary(`(module
(func $foo (result i32) (i32.const 42))
(export "foo" $foo)
)`));
var m2 = new Module(wasmTextToBinary(`(module
(import $foo "a" "foo" (result i32))
(func $bar (result i32) (call $foo))
(export "bar" $bar)
)`));
// Instantiate while not active:
var e1 = new Instance(m1).exports;
var e2 = new Instance(m2, {a:e1}).exports;
enableSPSProfiling();
enableSingleStepProfiling();
assertEq(e2.bar(), 42);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "1,>", "0,1,>", "1,>", ">", ""]);
disableSPSProfiling();
assertEq(e2.bar(), 42);
// Instantiate while active:
enableSPSProfiling();
var e3 = new Instance(m1).exports;
var e4 = new Instance(m2, {a:e3}).exports;
enableSingleStepProfiling();
assertEq(e4.bar(), 42);
assertEqStacks(disableSingleStepProfiling(), ["", ">", "1,>", "0,1,>", "1,>", ">", ""]);
disableSPSProfiling();
assertEq(e4.bar(), 42);
})();
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