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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Identifier.h"
#include "JSDestructibleObject.h"
#include "SourceCode.h"
#include "VariableEnvironment.h"
#include <wtf/HashMap.h>
#include <wtf/ListHashSet.h>
#include <wtf/Optional.h>
namespace JSC {
class JSModuleEnvironment;
class JSModuleNamespaceObject;
class JSMap;
// Based on the Source Text Module Record
// http://www.ecma-international.org/ecma-262/6.0/#sec-source-text-module-records
class AbstractModuleRecord : public JSDestructibleObject {
friend class LLIntOffsetsExtractor;
public:
typedef JSDestructibleObject Base;
// https://tc39.github.io/ecma262/#sec-source-text-module-records
struct ExportEntry {
enum class Type {
Local,
Indirect
};
static ExportEntry createLocal(const Identifier& exportName, const Identifier& localName);
static ExportEntry createIndirect(const Identifier& exportName, const Identifier& importName, const Identifier& moduleName);
Type type;
Identifier exportName;
Identifier moduleName;
Identifier importName;
Identifier localName;
};
struct ImportEntry {
Identifier moduleRequest;
Identifier importName;
Identifier localName;
bool isNamespace(VM& vm) const
{
return importName == vm.propertyNames->timesIdentifier;
}
};
typedef WTF::ListHashSet<RefPtr<UniquedStringImpl>, IdentifierRepHash> OrderedIdentifierSet;
typedef HashMap<RefPtr<UniquedStringImpl>, ImportEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>> ImportEntries;
typedef HashMap<RefPtr<UniquedStringImpl>, ExportEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>> ExportEntries;
DECLARE_EXPORT_INFO;
void appendRequestedModule(const Identifier&);
void addStarExportEntry(const Identifier&);
void addImportEntry(const ImportEntry&);
void addExportEntry(const ExportEntry&);
std::optional<ImportEntry> tryGetImportEntry(UniquedStringImpl* localName);
std::optional<ExportEntry> tryGetExportEntry(UniquedStringImpl* exportName);
const Identifier& moduleKey() const { return m_moduleKey; }
const OrderedIdentifierSet& requestedModules() const { return m_requestedModules; }
const ExportEntries& exportEntries() const { return m_exportEntries; }
const ImportEntries& importEntries() const { return m_importEntries; }
const OrderedIdentifierSet& starExportEntries() const { return m_starExportEntries; }
void dump();
struct Resolution {
enum class Type { Resolved, NotFound, Ambiguous, Error };
static Resolution notFound();
static Resolution error();
static Resolution ambiguous();
Type type;
AbstractModuleRecord* moduleRecord;
Identifier localName;
};
Resolution resolveExport(ExecState*, const Identifier& exportName);
Resolution resolveImport(ExecState*, const Identifier& localName);
AbstractModuleRecord* hostResolveImportedModule(ExecState*, const Identifier& moduleName);
JSModuleNamespaceObject* getModuleNamespace(ExecState*);
JSModuleEnvironment* moduleEnvironment()
{
ASSERT(m_moduleEnvironment);
return m_moduleEnvironment.get();
}
protected:
AbstractModuleRecord(VM&, Structure*, const Identifier&);
void finishCreation(ExecState*, VM&);
static void visitChildren(JSCell*, SlotVisitor&);
static void destroy(JSCell*);
WriteBarrier<JSModuleEnvironment> m_moduleEnvironment;
private:
struct ResolveQuery;
static Resolution resolveExportImpl(ExecState*, const ResolveQuery&);
std::optional<Resolution> tryGetCachedResolution(UniquedStringImpl* exportName);
void cacheResolution(UniquedStringImpl* exportName, const Resolution&);
// The loader resolves the given module name to the module key. The module key is the unique value to represent this module.
Identifier m_moduleKey;
// Currently, we don't keep the occurrence order of the import / export entries.
// So, we does not guarantee the order of the errors.
// e.g. The import declaration that occurr later than the another import declaration may
// throw the error even if the former import declaration also has the invalid content.
//
// import ... // (1) this has some invalid content.
// import ... // (2) this also has some invalid content.
//
// In the above case, (2) may throw the error earlier than (1)
//
// But, in all the cases, we will throw the syntax error. So except for the content of the syntax error,
// there are no difference.
// Map localName -> ImportEntry.
ImportEntries m_importEntries;
// Map exportName -> ExportEntry.
ExportEntries m_exportEntries;
// Save the occurrence order since resolveExport requires it.
OrderedIdentifierSet m_starExportEntries;
// Save the occurrence order since the module loader loads and runs the modules in this order.
// http://www.ecma-international.org/ecma-262/6.0/#sec-moduleevaluation
OrderedIdentifierSet m_requestedModules;
WriteBarrier<JSMap> m_dependenciesMap;
WriteBarrier<JSModuleNamespaceObject> m_moduleNamespaceObject;
// We assume that all the AbstractModuleRecord are retained by JSModuleLoader's registry.
// So here, we don't visit each object for GC. The resolution cache map caches the once
// looked up correctly resolved resolution, since (1) we rarely looked up the non-resolved one,
// and (2) if we cache all the attempts the size of the map becomes infinitely large.
typedef HashMap<RefPtr<UniquedStringImpl>, Resolution, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>> Resolutions;
Resolutions m_resolutionCache;
};
} // namespace JSC
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