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s.golasch
125
build/node_modules/prepack/lib/partial-evaluators/BinaryExpression.js
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build/node_modules/prepack/lib/partial-evaluators/BinaryExpression.js
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }(); /**
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* Copyright (c) 2017-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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exports.default = function (ast, strictCode, env, realm) {
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var _env$partiallyEvaluat = env.partiallyEvaluateCompletionDeref(ast.left, strictCode),
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_env$partiallyEvaluat2 = _slicedToArray(_env$partiallyEvaluat, 3),
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lval = _env$partiallyEvaluat2[0],
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leftAst = _env$partiallyEvaluat2[1],
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leftIO = _env$partiallyEvaluat2[2];
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if (lval instanceof _completions.AbruptCompletion) return [lval, leftAst, leftIO];
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var leftCompletion = void 0;
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var _Join$unbundleNormalC = _singletons.Join.unbundleNormalCompletion(lval);
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var _Join$unbundleNormalC2 = _slicedToArray(_Join$unbundleNormalC, 2);
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leftCompletion = _Join$unbundleNormalC2[0];
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lval = _Join$unbundleNormalC2[1];
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(0, _invariant2.default)(lval instanceof _index.Value);
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var _env$partiallyEvaluat3 = env.partiallyEvaluateCompletionDeref(ast.right, strictCode),
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_env$partiallyEvaluat4 = _slicedToArray(_env$partiallyEvaluat3, 3),
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rval = _env$partiallyEvaluat4[0],
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rightAst = _env$partiallyEvaluat4[1],
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rightIO = _env$partiallyEvaluat4[2];
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var io = leftIO.concat(rightIO);
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if (rval instanceof _completions.AbruptCompletion) {
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// todo: if leftCompletion is a PossiblyNormalCompletion, compose
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return [rval, t.binaryExpression(ast.operator, leftAst, rightAst), io];
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}
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var rightCompletion = void 0;
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var _Join$unbundleNormalC3 = _singletons.Join.unbundleNormalCompletion(rval);
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var _Join$unbundleNormalC4 = _slicedToArray(_Join$unbundleNormalC3, 2);
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rightCompletion = _Join$unbundleNormalC4[0];
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rval = _Join$unbundleNormalC4[1];
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(0, _invariant2.default)(rval instanceof _index.Value);
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var op = ast.operator;
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var resultValue = void 0,
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resultAst = void 0;
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if (lval instanceof _index.ConcreteValue) {
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if (rval instanceof _index.ConcreteValue) {
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resultValue = (0, _BinaryExpression.computeBinary)(realm, op, lval, rval);
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resultAst = t.valueToNode(resultValue.serialize());
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}
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}
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// if resultValue is undefined, one or both operands are abstract.
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if (resultValue === undefined && (op === "==" || op === "===" || op === "!=" || op === "!==")) {
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// When comparing to null or undefined, we can return a compile time value if we know the
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// other operand must be an object.
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if (!lval.mightNotBeObject() && (rval instanceof _index.NullValue || rval instanceof _index.UndefinedValue) || !rval.mightNotBeObject() && (lval instanceof _index.NullValue || lval instanceof _index.UndefinedValue)) {
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resultValue = new _index.BooleanValue(realm, op[0] !== "=");
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resultAst = t.valueToNode(resultValue.serialize());
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}
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}
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// todo: special case if one result is known to be 0 or 1
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if (resultAst === undefined) {
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resultAst = t.binaryExpression(op, leftAst, rightAst);
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}
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return createAbstractValueForBinary(op, resultAst, lval, rval, leftAst.loc, rightAst.loc, leftCompletion, rightCompletion, resultValue, io, realm);
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};
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exports.createAbstractValueForBinary = createAbstractValueForBinary;
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var _BinaryExpression = require("../evaluators/BinaryExpression.js");
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var _completions = require("../completions.js");
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var _errors = require("../errors.js");
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var _singletons = require("../singletons.js");
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var _index = require("../values/index.js");
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var _babelTypes = require("babel-types");
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var t = _interopRequireWildcard(_babelTypes);
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var _invariant = require("../invariant.js");
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var _invariant2 = _interopRequireDefault(_invariant);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
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function createAbstractValueForBinary(op, ast, lval, rval, lloc, rloc, leftCompletion, rightCompletion, resultValue, io, realm) {
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if (resultValue === undefined) {
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var resultType = (0, _BinaryExpression.getPureBinaryOperationResultType)(realm, op, lval, rval, lloc, rloc);
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if (resultType === undefined) {
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// The operation may result in side effects that we cannot track.
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// Since we have no idea what those effects are, we can either forget
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// (havoc) everything we know at this stage, or we can fault the
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// program and/or native model and stop evaluating.
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// We choose to do the latter.
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// TODO: report the error and carry on assuming no side effects.
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var val = lval instanceof _index.AbstractValue ? lval : rval;
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_index.AbstractValue.reportIntrospectionError(val);
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throw new _errors.FatalError();
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}
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resultValue = _index.AbstractValue.createFromBinaryOp(realm, op, lval, rval, ast.loc);
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}
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var r = _singletons.Join.composeNormalCompletions(leftCompletion, rightCompletion, resultValue, realm);
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return [r, ast, io];
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}
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//# sourceMappingURL=BinaryExpression.js.map
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