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remove old tail call transformer

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This commit is contained in:
Sebastian McKenzie 2015-02-10 18:33:51 +11:00
parent 7f61c8b65e
commit 47b803ef24
14 changed files with 0 additions and 276 deletions
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116
lib/6to5/transformation/transformers/es6/.tail-call.js
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@ -1,116 +0,0 @@
"use strict";
var t = require("../../../types");
function transformExpression(node, scope, state) {
if (!node) return;
return (function subTransform(node) {
switch (node.type) {
case "ConditionalExpression":
// any value of ternary operator can be final one
subTransform(node.consequent);
subTransform(node.alternate);
break;
case "LogicalExpression":
// only right expression can be final and so optimized
subTransform(node.right);
break;
case "SequenceExpression":
// only last element of sequence can be optimized
var seq = node.expressions;
subTransform(seq[seq.length - 1]);
break;
case "CallExpression":
var callee = node.callee, thisBinding;
var args = [callee];
// bind `this` to object in member expressions
if (t.isMemberExpression(callee)) {
var object = state.wrapSideEffect(callee.object);
callee.object = object.expr;
thisBinding = object.ref;
}
if (node.arguments.length > 0 || thisBinding) {
args.push(t.arrayExpression(node.arguments));
}
if (thisBinding) {
args.push(thisBinding);
}
node.callee = state.getHelperRef();
node.arguments = args;
break;
}
})(node);
}
var functionChildrenVisitor = {
enter: function (node, parent, scope, state) {
if (t.isReturnStatement(node)) {
// prevent entrance by current visitor
this.skip();
// transform return argument into statement if
// it contains tail recursion
transformExpression(node.argument, scope, state);
} else if (t.isFunction(node)) {
// inner function's bodies are irrelevant
this.skip();
} else if (t.isTryStatement(parent)) {
if (node === parent.block) {
// `try`-blocks can't be optimized
this.skip();
} else if (parent.finalizer && node !== parent.finalizer) {
// `catch` clause followed by `finally` can't be optimized
this.skip();
}
}
}
};
var functionVisitor = {
enter: function (node, parent, scope, state) {
// traverse all child nodes of this function and find `arguments` and `this`
scope.traverse(node, functionChildrenVisitor, state);
return this.skip();
}
};
exports.FunctionDeclaration =
exports.FunctionExpression = function (node, parent, scope, file) {
var tempId, helperRef;
var state = {
ownerId: node.id,
getHelperRef: function () {
return helperRef = helperRef || file.addHelper("tail-call");
},
wrapSideEffect: function (node) {
if (t.isIdentifier(node) || t.isLiteral(node)) {
return {expr: node, ref: node};
}
tempId = tempId || scope.generateUidIdentifier("temp");
return {
expr: t.assignmentExpression("=", tempId, node),
ref: tempId
};
}
};
// traverse the function and look for tail recursion
scope.traverse(node, functionVisitor, state);
if (tempId) {
t.ensureBlock(node).body.unshift(t.variableDeclaration("var", [
t.variableDeclarator(tempId)
]));
}
};

7
test/fixtures/transformation/.es6-tail-call/call-apply/actual.js vendored
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@ -1,7 +0,0 @@
(function f(n) {
if (n <= 0) {
console.log(this, arguments);
return "foo";
}
return Math.random() > 0.5 ? f.call(this, n - 1) : f.apply(this, [n - 1]);
})(1e6) === "foo";

9
test/fixtures/transformation/.es6-tail-call/call-apply/expected.js vendored
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@ -1,9 +0,0 @@
"use strict";
(function f(n) {
if (n <= 0) {
console.log(this, arguments);
return "foo";
}
return Math.random() > 0.5 ? to5Runtime.tailCall(f.call, [this, n - 1], f) : to5Runtime.tailCall(f.apply, [this, [n - 1]], f);
})(1000000) === "foo";

7
test/fixtures/transformation/.es6-tail-call/cross-function/actual.js vendored
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@ -1,7 +0,0 @@
function f(n) {
return n <= 0 ? "foo" : g(n - 1);
}
function g(n) {
return n <= 0 ? "goo" : f(n - 1);
}

9
test/fixtures/transformation/.es6-tail-call/cross-function/expected.js vendored
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@ -1,9 +0,0 @@
"use strict";
function f(n) {
return n <= 0 ? "foo" : to5Runtime.tailCall(g, [n - 1]);
}
function g(n) {
return n <= 0 ? "goo" : to5Runtime.tailCall(f, [n - 1]);
}

3
test/fixtures/transformation/.es6-tail-call/expressions/actual.js vendored
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@ -1,3 +0,0 @@
(function f(n) {
return n <= 0 ? "foo" : (doSmth(), getTrueValue() && (getFalseValue() || f(n - 1)));
})(1e6, true) === "foo";

5
test/fixtures/transformation/.es6-tail-call/expressions/expected.js vendored
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@ -1,5 +0,0 @@
"use strict";
(function f(n) {
return n <= 0 ? "foo" : (doSmth(), getTrueValue() && (getFalseValue() || to5Runtime.tailCall(f, [n - 1])));
})(1000000, true) === "foo";

4
test/fixtures/transformation/.es6-tail-call/options.json vendored
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@ -1,4 +0,0 @@
{
"runtime": true,
"blacklist": []
}

8
test/fixtures/transformation/.es6-tail-call/recursion/actual.js vendored
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@ -1,8 +0,0 @@
(function f(n = getDefaultValue(), /* should be undefined after first pass */ m) {
if (n <= 0) {
return "foo";
}
// Should be clean (undefined) on each pass
var local;
return f(n - 1);
})(1e6, true) === "foo";

11
test/fixtures/transformation/.es6-tail-call/recursion/expected.js vendored
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@ -1,11 +0,0 @@
"use strict";
(function f(_x, /* should be undefined after first pass */m) {
var n = arguments[0] === undefined ? getDefaultValue() : arguments[0];
if (n <= 0) {
return "foo";
}
// Should be clean (undefined) on each pass
var local;
return to5Runtime.tailCall(f, [n - 1]);
})(1000000, true) === "foo";

7
test/fixtures/transformation/.es6-tail-call/side-effect/actual.js vendored
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@ -1,7 +0,0 @@
function f() {
return getObj().method();
}
function g() {
return getFalseValue() || getValue();
}

10
test/fixtures/transformation/.es6-tail-call/side-effect/expected.js vendored
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@ -1,10 +0,0 @@
"use strict";
function f() {
var _temp;
return to5Runtime.tailCall((_temp = getObj()).method, [], _temp);
}
function g() {
return getFalseValue() || to5Runtime.tailCall(getValue);
}

39
test/fixtures/transformation/.es6-tail-call/try-catch/actual.js vendored
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@ -1,39 +0,0 @@
(function f(n) {
if (n <= 0) {
return "foo";
}
try {
return f(n - 1);
} catch (e) {}
})(1e6) === "foo";
(function f(n) {
if (n <= 0) {
return "foo";
}
try {
throw new Error();
} catch (e) {
return f(n - 1);
}
})(1e6) === "foo";
(function f(n) {
if (n <= 0) {
return "foo";
}
try {
throw new Error();
} catch (e) {
return f(n - 1);
} finally {}
})(1e6) === "foo";
(function f(n) {
if (n <= 0) {
return "foo";
}
try {} finally {
return f(n - 1);
}
})(1e6) === "foo";

41
test/fixtures/transformation/.es6-tail-call/try-catch/expected.js vendored
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@ -1,41 +0,0 @@
"use strict";
(function f(n) {
if (n <= 0) {
return "foo";
}
try {
return f(n - 1);
} catch (e) {}
})(1000000) === "foo";
(function f(n) {
if (n <= 0) {
return "foo";
}
try {
throw new Error();
} catch (e) {
return to5Runtime.tailCall(f, [n - 1]);
}
})(1000000) === "foo";
(function f(n) {
if (n <= 0) {
return "foo";
}
try {
throw new Error();
} catch (e) {
return f(n - 1);
} finally {}
})(1000000) === "foo";
(function f(n) {
if (n <= 0) {
return "foo";
}
try {} finally {
return to5Runtime.tailCall(f, [n - 1]);
}
})(1000000) === "foo";