/*
 * Copyright (c) 2020, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.oracle.truffle.js.nodes.module;

import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.profiles.ValueProfile;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.access.JSWriteFrameSlotNode;
import com.oracle.truffle.js.nodes.control.StatementNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.Evaluator;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.objects.ExportResolution;
import com.oracle.truffle.js.runtime.objects.JSModuleRecord;

import java.util.Set;

Resolves a named import binding and writes the resolved binding into the frame. Throws a SyntaxError if the imported binding could not be found or was ambiguous.
See Also:
  • ReadImportBindingNode
/** * Resolves a named import binding and writes the resolved binding into the frame. Throws a * SyntaxError if the imported binding could not be found or was ambiguous. * * @see ReadImportBindingNode */
public class ResolveNamedImportNode extends StatementNode { private final JSContext context; private final String moduleRequest; private final String importName; @Child private JavaScriptNode moduleNode; @Child private JSWriteFrameSlotNode writeLocalNode; private final ValueProfile resolutionProfile = ValueProfile.createClassProfile(); ResolveNamedImportNode(JSContext context, JavaScriptNode moduleNode, String moduleRequest, String importName, JSWriteFrameSlotNode writeLocalNode) { this.context = context; this.moduleRequest = moduleRequest; this.moduleNode = moduleNode; this.importName = importName; this.writeLocalNode = writeLocalNode; } public static StatementNode create(JSContext context, JavaScriptNode moduleNode, String moduleRequest, String importName, JSWriteFrameSlotNode writeLocalNode) { return new ResolveNamedImportNode(context, moduleNode, moduleRequest, importName, writeLocalNode); } @Override public Object execute(VirtualFrame frame) { JSModuleRecord referencingScriptOrModule = (JSModuleRecord) moduleNode.execute(frame); Evaluator evaluator = context.getEvaluator(); JSModuleRecord importedModule = evaluator.hostResolveImportedModule(context, referencingScriptOrModule, moduleRequest); // Let resolution be importedModule.ResolveExport(in.[[ImportName]], << >>, << >>). ExportResolution resolution = resolutionProfile.profile(evaluator.resolveExport(importedModule, importName)); // If resolution is null or resolution is "ambiguous", throw SyntaxError. if (resolution.isNull() || resolution.isAmbiguous()) { String message = "The requested module '%s' does not provide an export named '%s'"; throw Errors.createSyntaxErrorFormat(message, this, moduleRequest, importName); } Object resolutionOrNamespace; if (resolution.isNamespace()) { resolutionOrNamespace = evaluator.getModuleNamespace(resolution.getModule()); } else { resolutionOrNamespace = resolution; } writeLocalNode.executeWrite(frame, resolutionOrNamespace); return EMPTY; } @Override protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) { return create(context, cloneUninitialized(moduleNode, materializedTags), moduleRequest, importName, cloneUninitialized(writeLocalNode, materializedTags)); } }