In Ambly, created a new branch jsc-c-api.

In that branch, switched everything over to use JSGlobalContextRef, JSValueRef, but actually commented out most of the implementation in each of the methods, except for one tiny bit in ABYServer, where REPL-generated JavaScript is executed. I converted that over to a C-based approach:

    // Evaluate the JavaScript
    JSValueRef jsError = NULL;
    JSStringRef javaScriptStringRef = JSStringCreateWithCFString((__bridge CFStringRef)javaScript);
    JSValueRef result = JSEvaluateScript(_jsContext, javaScriptStringRef, NULL, NULL, 0, &jsError);
    JSStringRelease(javaScriptStringRef);

If I "cheat" and temporarily revert back to the original implementation for [ABYContextManager setUpAmblyImportScript], then "basic" REPL functionality works. You can evaluate (+ 3 4) and get back 7.

I pushed up all of this to GitHub (without the "cheat" above), and then tried to see if things can link using this podfile:

platform :ios, '8.0'
pod 'Ambly', :git => 'https://github.com/omcljs/ambly', :branch => 'jsc-c-api', :commit => 'b25b8c8'
pod 'Ejecta', :git => 'https://github.com/swannodette/Ejecta', :branch => 'podspec', :commit => 'e8f3219b'

It does link, but produces what might be a concerning warning about ambiguity:

objc[48646]: Class JSWTFMainThreadCaller is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/JavaScriptCore.framework/JavaScriptCore and /Users/mfikes/Library/Developer/CoreSimulator/Devices/09FA3E0E-B6B4-47F8-B604-F4ED9367F8ED/data/Containers/Bundle/Application/40681C23-675A-4DA8-9770-64E5E75851EA/TestLink.app/TestLink. One of the two will be used. Which one is undefined.