generate-nosuchproperty-tests.js

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// This code generates the test cases jit-test/tests/baseline/no-such-property-getprop.js

//

// In particular, it generates the testChain_<N>_<I>() and runChain_<N>_<I>() functions

// at the tail of the file.

var TEST_CASE_FUNCS =  [];

function runChain_NNNN_DDDD(obj) {

    var sum = 0;

    for (var i = 0; i < 100; i++)

        sum += obj.foo;

    return sum;

function testChain_NNNN_DDDD() {

    var obj = createTower(NNNN);

    assertEq(runChain_NNNN_DDDD(obj), NaN);

    updateChain(obj, DDDD, 'foo', 9);

    assertEq(runChain_NNNN_DDDD(obj), 900);

function generateTestCase(n, d) {

    var runFuncName = "runChain_" + n + "_" + d;

    var testFuncName = "testChain_" + n + "_" + d;

    TEST_CASE_FUNCS.push(testFuncName);

    print("//// Test chain of length " + n + " with late-property-addition at depth " + d);

    print(String(runChain_NNNN_DDDD).replace(/NNNN/g, ''+n).replace(/DDDD/g, ''+d));

    print(String(testChain_NNNN_DDDD).replace(/NNNN/g, ''+n).replace(/DDDD/g, ''+d));

    print("");

// Helper function to create an object with a proto-chain of length N.

function createTower(n) {

    var result = Object.create(null);

    for (var i = 0; i < n; i++)

        result = Object.create(result);

    return result;

function updateChain(obj, depth, prop, value) {

    // Walk down the proto chain |depth| iterations and set |prop| to |value|.

    var cur = obj;

    for (var i = 0; i < depth; i++)

        cur = Object.getPrototypeOf(cur);

    var desc = {value:value, writable:true, configurable:true, enumerable:true};

    Object.defineProperty(cur, prop, desc);

print("/////////////////////////////////////////");

print("// This is a generated file!");

print("// See jit-tests/etc/generate-nosuchproperty-tests.js for the code");

print("// that generated this code!");

print("/////////////////////////////////////////");

print("");

print("/////////////////////////////////////////");

print("// PRELUDE                             //");

print("/////////////////////////////////////////");

print("");

print(createTower);

print(updateChain);

print("");

print("/////////////////////////////////////////");

print("// TEST CASES                          //");

print("/////////////////////////////////////////");

print("");

for (var n = 0; n <= 10; n++) {

    for (var d = 0; d <= n; d++) {

        generateTestCase(n, d);

print("");

print("/////////////////////////////////////////");

print("// RUNNER                              //");

print("/////////////////////////////////////////");

print("");

for (var i = 0; i < TEST_CASE_FUNCS.length; i++)

    print(TEST_CASE_FUNCS[i] + "();");