[Webkit-unassigned] [Bug 234971] New: JSC::JSWebAssemblyModule::createStub() falls through ASSERT_NOT_REACHED()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234971

            Bug ID: 234971
           Summary: JSC::JSWebAssemblyModule::createStub() falls through
                    ASSERT_NOT_REACHED()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ddkilzer at webkit.org
        Depends on: 234932

JSC::JSWebAssemblyModule::createStub() falls through ASSERT_NOT_REACHED().

These fall-throughs should either use RELEASE_ASSERT_NOT_REACHED(), or add a `return nullptr;` statement after ASSERT_NOT_REACHED().

Presumably the switch statement will never fall through unless there is memory corruption, so a RELEASE_ASSERT_NOT_REACHED() would catch such corruption much earlier.

JSWebAssemblyModule* JSWebAssemblyModule::createStub(VM& vm, JSGlobalObject* globalObject, Structure* structure, Wasm::Module::ValidationResult&& result)
{
    [...]
    auto error = module->generateWasmToJSStubs(vm);
    if (UNLIKELY(!error)) {
        switch (error.error()) {
        case Wasm::BindingFailure::OutOfMemory:
            throwException(globalObject, scope, createJSWebAssemblyLinkError(globalObject, vm, "Out of executable memory"_s));
            return nullptr;
        }
        ASSERT_NOT_REACHED();
    }
    return module;
}

See Source/JavaScriptCore/wasm/js/JSWebAssemblyModule.cpp.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=234932
[Bug 234932] check-webkit-style: add checker for unexpected fall through after ASSERT_NOT_REACHED() statements
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