Part 1: Implement ES6 function name property semantics

Issue mcp-graveyard/UXP%78

6 files changed, 384 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Function/function-name-assignment.js b/js/src/tests/ecma_6/Function/function-name-assignment.js
new file mode 100644
index 000000000..5e4d1c004
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/function-name-assignment.js
@@ -0,0 +1,139 @@
+var BUGNUMBER = 883377;
+var summary = "Anonymous function name should be set based on assignment";
+
+print(BUGNUMBER + ": " + summary);
+
+var fooSymbol = Symbol("foo");
+var emptySymbol = Symbol("");
+var undefSymbol = Symbol();
+var globalVar;
+
+var exprs = [
+    ["function() {}", false],
+    ["function named() {}", true],
+    ["function*() {}", false],
+    ["function* named() {}", true],
+    ["async function() {}", false],
+    ["async function named() {}", true],
+    ["() => {}", false],
+    ["async () => {}", false],
+    ["class {}", false],
+    ["class named {}", true],
+];
+
+function testAssignmentExpression(expr, named) {
+    eval(`
+    var assignment;
+    assignment = ${expr};
+    assertEq(assignment.name, named ? "named" : "assignment");
+
+    globalVar = ${expr};
+    assertEq(globalVar.name, named ? "named" : "globalVar");
+
+    var obj = { dynamic: null };
+    with (obj) {
+        dynamic = ${expr};
+    }
+    assertEq(obj.dynamic.name, named ? "named" : "dynamic");
+
+    (function namedLambda(param1, param2) {
+        var assignedToNamedLambda;
+        assignedToNamedLambda = namedLambda = ${expr};
+        assertEq(namedLambda.name, "namedLambda");
+        assertEq(assignedToNamedLambda.name, named ? "named" : "namedLambda");
+
+        param1 = ${expr};
+        assertEq(param1.name, named ? "named" : "param1");
+
+        {
+            let param1 = ${expr};
+            assertEq(param1.name, named ? "named" : "param1");
+
+            param2 = ${expr};
+            assertEq(param2.name, named ? "named" : "param2");
+        }
+    })();
+
+    {
+        let nextedLexical1, nextedLexical2;
+        {
+            let nextedLexical1 = ${expr};
+            assertEq(nextedLexical1.name, named ? "named" : "nextedLexical1");
+
+            nextedLexical2 = ${expr};
+            assertEq(nextedLexical2.name, named ? "named" : "nextedLexical2");
+        }
+    }
+    `);
+
+    // Not applicable cases: not IsIdentifierRef.
+    eval(`
+    var inParen;
+    (inParen) = ${expr};
+    assertEq(inParen.name, named ? "named" : "");
+    `);
+
+    // Not applicable cases: not direct RHS.
+    if (!expr.includes("=>")) {
+        eval(`
+        var a = true && ${expr};
+        assertEq(a.name, named ? "named" : "");
+        `);
+    } else {
+        // Arrow function cannot be RHS of &&.
+        eval(`
+        var a = true && (${expr});
+        assertEq(a.name, named ? "named" : "");
+        `);
+    }
+
+    // Not applicable cases: property.
+    eval(`
+    var obj = {};
+
+    obj.prop = ${expr};
+    assertEq(obj.prop.name, named ? "named" : "");
+
+    obj["literal"] = ${expr};
+    assertEq(obj["literal"].name, named ? "named" : "");
+    `);
+
+    // Not applicable cases: assigned again.
+    eval(`
+    var tmp = [${expr}];
+    assertEq(tmp[0].name, named ? "named" : "");
+
+    var assignment;
+    assignment = tmp[0];
+    assertEq(assignment.name, named ? "named" : "");
+    `);
+}
+for (var [expr, named] of exprs) {
+    testAssignmentExpression(expr, named);
+}
+
+function testVariableDeclaration(expr, named) {
+    eval(`
+    var varDecl = ${expr};
+    assertEq(varDecl.name, named ? "named" : "varDecl");
+    `);
+}
+for (var [expr, named] of exprs) {
+    testVariableDeclaration(expr, named);
+}
+
+function testLexicalBinding(expr, named) {
+    eval(`
+    let lexical = ${expr};
+    assertEq(lexical.name, named ? "named" : "lexical");
+
+    const constLexical = ${expr};
+    assertEq(constLexical.name, named ? "named" : "constLexical");
+    `);
+}
+for (var [expr, named] of exprs) {
+    testLexicalBinding(expr, named);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);
diff --git a/js/src/tests/ecma_6/Function/function-name-binding.js b/js/src/tests/ecma_6/Function/function-name-binding.js
new file mode 100644
index 000000000..bdd6c131c
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/function-name-binding.js
@@ -0,0 +1,54 @@
+var BUGNUMBER = 883377;
+var summary = "Anonymous function name should be set based on binding pattern";
+
+print(BUGNUMBER + ": " + summary);
+
+var exprs = [
+    ["function() {}", false],
+    ["function named() {}", true],
+    ["function*() {}", false],
+    ["function* named() {}", true],
+    ["async function() {}", false],
+    ["async function named() {}", true],
+    ["() => {}", false],
+    ["async () => {}", false],
+    ["class {}", false],
+    ["class named {}", true],
+];
+
+function testAssignmentProperty(expr, named) {
+    var f = eval(`(function({ prop1 = ${expr} }) { return prop1; })`);
+    assertEq(f({}).name, named ? "named" : "prop1");
+
+    eval(`
+    var { prop1 = ${expr} } = {};
+    assertEq(prop1.name, named ? "named" : "prop1");
+    `);
+}
+for (var [expr, named] of exprs) {
+    testAssignmentProperty(expr, named);
+}
+
+function testAssignmentElement(expr, named) {
+    var f = eval(`(function([elem1 = ${expr}]) { return elem1; })`);
+    assertEq(f([]).name, named ? "named" : "elem1");
+
+    eval(`
+    var [elem1 = ${expr}] = [];
+    assertEq(elem1.name, named ? "named" : "elem1");
+    `);
+}
+for (var [expr, named] of exprs) {
+    testAssignmentElement(expr, named);
+}
+
+function testSingleNameBinding(expr, named) {
+    var f = eval(`(function(param1 = ${expr}) { return param1; })`);
+    assertEq(f().name, named ? "named" : "param1");
+}
+for (var [expr, named] of exprs) {
+    testSingleNameBinding(expr, named);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);
diff --git a/js/src/tests/ecma_6/Function/function-name-class.js b/js/src/tests/ecma_6/Function/function-name-class.js
new file mode 100644
index 000000000..edde69055
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/function-name-class.js
@@ -0,0 +1,32 @@
+var BUGNUMBER = 883377;
+var summary = "Anonymous class with name method shouldn't be affected by assignment";
+
+print(BUGNUMBER + ": " + summary);
+
+var classWithStaticNameMethod = class { static name() {} };
+assertEq(typeof classWithStaticNameMethod.name, "function");
+
+var classWithStaticNameGetter = class { static get name() { return "static name"; } };
+assertEq(typeof Object.getOwnPropertyDescriptor(classWithStaticNameGetter, "name").get, "function");
+assertEq(classWithStaticNameGetter.name, "static name");
+
+var classWithStaticNameSetter = class { static set name(v) {} };
+assertEq(typeof Object.getOwnPropertyDescriptor(classWithStaticNameSetter, "name").set, "function");
+
+var n = "NAME".toLowerCase();
+var classWithStaticNameMethodComputed = class { static [n]() {} };
+assertEq(typeof classWithStaticNameMethodComputed.name, "function");
+
+// It doesn't apply for non-static method.
+
+var classWithNameMethod = class { name() {} };
+assertEq(classWithNameMethod.name, "classWithNameMethod");
+
+var classWithNameGetter = class { get name() { return "name"; } };
+assertEq(classWithNameGetter.name, "classWithNameGetter");
+
+var classWithNameSetter = class { set name(v) {} };
+assertEq(classWithNameSetter.name, "classWithNameSetter");
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);
diff --git a/js/src/tests/ecma_6/Function/function-name-for.js b/js/src/tests/ecma_6/Function/function-name-for.js
new file mode 100644
index 000000000..2f04a5fa8
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/function-name-for.js
@@ -0,0 +1,31 @@
+var BUGNUMBER = 883377;
+var summary = "Anonymous function name should be set based on for-in initializer";
+
+print(BUGNUMBER + ": " + summary);
+
+var exprs = [
+    ["function() {}", false],
+    ["function named() {}", true],
+    ["function*() {}", false],
+    ["function* named() {}", true],
+    ["async function() {}", false],
+    ["async function named() {}", true],
+    ["() => {}", false],
+    ["async () => {}", false],
+    ["class {}", false],
+    ["class named {}", true],
+];
+
+function testForInHead(expr, named) {
+    eval(`
+    for (var forInHead = ${expr} in {}) {
+    }
+    `);
+    assertEq(forInHead.name, named ? "named" : "forInHead");
+}
+for (var [expr, named] of exprs) {
+    testForInHead(expr, named);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);
diff --git a/js/src/tests/ecma_6/Function/function-name-method.js b/js/src/tests/ecma_6/Function/function-name-method.js
new file mode 100644
index 000000000..3b2eeee79
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/function-name-method.js
@@ -0,0 +1,70 @@
+var BUGNUMBER = 883377;
+var summary = "Anonymous function name should be set based on method definition";
+
+print(BUGNUMBER + ": " + summary);
+
+var fooSymbol = Symbol("foo");
+var emptySymbol = Symbol("");
+var undefSymbol = Symbol();
+
+function testMethod(prefix, classPrefix="", prototype=false) {
+    var param = (prefix == "set" || prefix == "static set") ? "v" : "";
+    var sep = classPrefix ? "" : ",";
+    var objOrClass = eval(`(${classPrefix}{
+        ${prefix} prop(${param}) {} ${sep}
+        ${prefix} "literal"(${param}) {} ${sep}
+        ${prefix} ""(${param}) {} ${sep}
+        ${prefix} 5(${param}) {} ${sep}
+        ${prefix} [Symbol.iterator](${param}) {} ${sep}
+        ${prefix} [fooSymbol](${param}) {} ${sep}
+        ${prefix} [emptySymbol](${param}) {} ${sep}
+        ${prefix} [undefSymbol](${param}) {} ${sep}
+        ${prefix} [/a/](${param}) {} ${sep}
+    })`);
+
+    var target = prototype ? objOrClass.prototype : objOrClass;
+
+    function testOne(methodName, expectedName) {
+        var f;
+        if (prefix == "get" || prefix == "static get") {
+            f = Object.getOwnPropertyDescriptor(target, methodName).get;
+            expectedName = "get " + expectedName;
+        } else if (prefix == "set" || prefix == "static set") {
+            f = Object.getOwnPropertyDescriptor(target, methodName).set;
+            expectedName = "set " + expectedName;
+        } else {
+            f = Object.getOwnPropertyDescriptor(target, methodName).value;
+        }
+
+        assertEq(f.name, expectedName);
+    }
+    testOne("prop", "prop");
+    testOne("literal", "literal");
+    testOne("", "");
+    testOne(5, "5");
+    testOne(Symbol.iterator, "[Symbol.iterator]");
+    testOne(fooSymbol, "[foo]");
+    testOne(emptySymbol, "[]");
+    testOne(undefSymbol, "");
+    testOne(/a/, "/a/");
+}
+testMethod("");
+testMethod("*");
+testMethod("async");
+testMethod("get");
+testMethod("set");
+
+testMethod("", "class", true);
+testMethod("*", "class", true);
+testMethod("async", "class", true);
+testMethod("get", "class", true);
+testMethod("set", "class", true);
+
+testMethod("static", "class");
+testMethod("static *", "class");
+testMethod("static async", "class");
+testMethod("static get", "class");
+testMethod("static set", "class");
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);
diff --git a/js/src/tests/ecma_6/Function/function-name-property.js b/js/src/tests/ecma_6/Function/function-name-property.js
new file mode 100644
index 000000000..7ad174b10
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/function-name-property.js
@@ -0,0 +1,58 @@
+var BUGNUMBER = 883377;
+var summary = "Anonymous function name should be set based on property name";
+
+print(BUGNUMBER + ": " + summary);
+
+var fooSymbol = Symbol("foo");
+var emptySymbol = Symbol("");
+var undefSymbol = Symbol();
+
+var exprs = [
+    ["function() {}", false],
+    ["function named() {}", true],
+    ["function*() {}", false],
+    ["function* named() {}", true],
+    ["async function() {}", false],
+    ["async function named() {}", true],
+    ["() => {}", false],
+    ["async () => {}", false],
+    ["class {}", false],
+    ["class named {}", true],
+];
+
+function testPropertyDefinition(expr, named) {
+    var obj = eval(`({
+        prop: ${expr},
+        "literal": ${expr},
+        "": ${expr},
+        5: ${expr},
+        0.4: ${expr},
+        [Symbol.iterator]: ${expr},
+        [fooSymbol]: ${expr},
+        [emptySymbol]: ${expr},
+        [undefSymbol]: ${expr},
+        [/a/]: ${expr},
+    })`);
+    assertEq(obj.prop.name, named ? "named" : "prop");
+    assertEq(obj["literal"].name, named ? "named" : "literal");
+    assertEq(obj[""].name, named ? "named" : "");
+    assertEq(obj[5].name, named ? "named" : "5");
+    assertEq(obj[0.4].name, named ? "named" : "0.4");
+    assertEq(obj[Symbol.iterator].name, named ? "named" : "[Symbol.iterator]");
+    assertEq(obj[fooSymbol].name, named ? "named" : "[foo]");
+    assertEq(obj[emptySymbol].name, named ? "named" : "[]");
+    assertEq(obj[undefSymbol].name, named ? "named" : "");
+    assertEq(obj[/a/].name, named ? "named" : "/a/");
+
+    // Not applicable cases: __proto__.
+    obj = {
+        __proto__: function() {}
+    };
+    assertEq(obj.__proto__.name, "");
+}
+for (var [expr, named] of exprs) {
+    testPropertyDefinition(expr, named);
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);