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/*
* Copyright (C) 2025 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.
*/
#include "config.h"
#include "WebAssemblyCompileOptions.h"
#if ENABLE(WEBASSEMBLY)
#include "IteratorOperations.h"
#include "WasmModuleInformation.h"
#include "WebAssemblyBuiltin.h"
namespace JSC {
std::optional<WebAssemblyCompileOptions> WebAssemblyCompileOptions::tryCreate(JSGlobalObject* globalObject, JSObject *optionsObject)
{
if (!optionsObject)
return std::nullopt;
WebAssemblyCompileOptions options;
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// Check for the 'importedStringConstants' entry
JSValue importedStringConstantsValue = optionsObject->get(globalObject, PropertyName(Identifier::fromString(vm, "importedStringConstants"_s)));
RETURN_IF_EXCEPTION(scope, std::nullopt);
if (importedStringConstantsValue.isString()) {
auto importedStringConstants = asString(importedStringConstantsValue)->value(globalObject);
options.m_importedStringConstants = makeString(StringView(importedStringConstants));
} else if (!importedStringConstantsValue.isUndefined()) {
auto error = createTypeError(globalObject, "importedStringConstants option value must be a string"_s);
throwException(globalObject, scope, error);
return std::nullopt;
}
// Check for the 'builtins' entry, qualifying builtin set names in the process.
JSValue builtinsValue = optionsObject->get(globalObject, PropertyName(Identifier::fromString(vm, "builtins"_s)));
RETURN_IF_EXCEPTION(scope, std::nullopt);
if (builtinsValue.isObject()) {
bool sawBadEntries = false;
forEachInIterable(globalObject, builtinsValue, [&] (VM&, JSGlobalObject* globalObject, JSValue nextValue) {
if (nextValue.isString()) {
auto contents = asString(nextValue)->value(globalObject);
String qualifiedName = makeString("wasm:"_s, StringView(contents));
options.m_qualifiedBuiltinSetNames.append(qualifiedName);
} else
sawBadEntries = true;
});
RETURN_IF_EXCEPTION(scope, std::nullopt);
if (sawBadEntries) {
auto error = createTypeError(globalObject, "builtins list option values must be strings"_s);
throwException(globalObject, scope, error);
return std::nullopt;
}
}
return options;
}
static bool namesInclude(const String& expected, const Vector<String>& names)
{
for (auto& name : names) {
if (name == expected)
return true;
}
return false;
}
static String makeQualifiedName(const Wasm::Import& import)
{
return makeString(import.module, ":"_s, import.field);
}
/**
* See step 2.1 of: https://webassembly.github.io/js-string-builtins/js-api/#validate-builtins-and-imported-string-for-a-webassembly-module
*
* Informally: the import should be an immutable global of type externref.
*/
static std::optional<String> validateImportedStringConstant(const Wasm::Import& import, const Wasm::ModuleInformation& moduleInformation)
{
if (import.kind != Wasm::ExternalKind::Global)
return makeString("imported string constant "_s, makeQualifiedName(import), " is not a global"_s);
const Wasm::GlobalInformation& global = moduleInformation.globals[import.kindIndex];
if (global.mutability != Wasm::Immutable || !Wasm::isExternref(global.type))
return makeString("imported string constant "_s, makeQualifiedName(import), " is not an immutable external reference"_s);
return std::nullopt;
}
/**
* See https://webassembly.github.io/js-string-builtins/js-api/#validate-an-import-for-builtins
*
* Informally:
* Fail the validation if:
* - there is a builtin set whose simple name appears in builtinSetNames, and
* - the qualified name of the builtin set matches the import module name, and
* - the builtin set contains a builtin matching the function name, and
* - the builtin type does not match the import type.
*/
bool WebAssemblyCompileOptions::validateImportForBuiltinSetNames(const Wasm::Import& import, const String& importModuleName, const Wasm::ModuleInformation& moduleInfo) const
{
if (!namesInclude(importModuleName, m_qualifiedBuiltinSetNames))
return true;
const WebAssemblyBuiltinSet* builtinSet = WebAssemblyBuiltinRegistry::singleton().findByQualifiedName(importModuleName);
if (!builtinSet)
return true;
String importName = makeString(import.field);
const WebAssemblyBuiltin* builtin = builtinSet->findBuiltin(importName);
if (!builtin)
return true;
auto& builtinSig = builtin->signature();
// The spec does not explicitly check if the import is a function because an import type is fully self-contained in `import[2]`.
// A non-function import would have a non-function type as its `import[2]`, failing the `match_externtype` check in Step 7.
// In our implementation import type is held externally, so we must check that the import kind is a function before fetching the function type
// at `kindIndex`. The wrong import kind is equivalent in spec terms to `match_externtype` returning false in Step 7.
if (import.kind != Wasm::ExternalKind::Function)
return false;
Wasm::TypeIndex typeIndex = moduleInfo.importFunctionTypeIndices[import.kindIndex];
Ref<const Wasm::TypeDefinition> type = Wasm::TypeInformation::get(typeIndex);
if (!type->is<Wasm::FunctionSignature>())
return false;
SUPPRESS_UNCOUNTED_LOCAL auto* importSig = type->as<Wasm::FunctionSignature>();
return builtinSig.isValid(*importSig);
}
/**
* See https://webassembly.github.io/js-string-builtins/js-api/#validate-builtins-and-imported-string-for-a-webassembly-module
*
* Return nullopt to indicate success or an error message if validation failed.
*/
std::optional<String> WebAssemblyCompileOptions::validateBuiltinsAndImportedStrings(const Wasm::Module& module) const
{
if (!validateBuiltinSetNames())
return String::fromLatin1("the list of builtin set names contains duplicates");
auto moduleInfo = Ref(module.moduleInformation());
for (const auto& import : moduleInfo.get().imports) {
String importModuleName = makeString(import.module);
if (m_importedStringConstants && *m_importedStringConstants == importModuleName) {
auto errorMessage = validateImportedStringConstant(import, moduleInfo.get());
if (errorMessage)
return errorMessage;
} else {
if (!validateImportForBuiltinSetNames(import, importModuleName, moduleInfo.get()))
return makeString("builtin import "_s, makeQualifiedName(import), " has an unexpected signature"_s);
}
}
return std::nullopt;
}
/**
* See https://webassembly.github.io/js-string-builtins/js-api/#validate-builtin-set-names
*
* Informally: the list of builtin set names should not have duplicates.
*/
bool WebAssemblyCompileOptions::validateBuiltinSetNames() const
{
UncheckedKeyHashSet<String> seen;
for (const auto& name : m_qualifiedBuiltinSetNames) {
if (seen.contains(name))
return false;
seen.add(name);
}
return true;
}
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
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