WebCore - The largest component of WebKit, this layer implements most of the Web APIs and their behaviors.JavaScriptCode also implements JavaScriptCore API for macOS and iOS applications. FTL JIT - Faster than Light Just In Time compiler which uses B3 backend.DFG JIT - Data Flow Graph Just In Time compiler uses the data flow analysis to generate optimized machine code.Baseline JIT - The first Just In Time compiler tier serves as the profiler as well as a significant speed up from the interpreter.Interpreter - This tier reads and executes instructions in byte code in C++.Also see Phil's blog post about Speculation in JavaScriptCore. Many tiers are needed to balance between compilation time and execution time. JSC parses JavaScript and generates byte code, which is then executed by one of the following four tiers. JavaScriptCore - WebKit’s JavaScript engine often abbreviated as JSC.It contains common container classes such as Vector, HashMap (unordered), HashSet, and smart pointer types such as Ref, RefPtr, and WeakPtr used throughout the rest of WebKit. The rest of the WebKit codebase is built using this template library in addition to, and often in place of, similar class templates in the C++ standard library. WTF - Stands for Web Template Framework. ![]() It provides an important security feature, called IsoHeap, which segregates each type of object into its own page to prevent type confusion attacks upon use-after-free. bmalloc - WebKit’s malloc implementation as a bump pointer allocator.It primarily consists of the following components, each inside its own directory in Source: The WebKit codebase is mostly written in C++ with bits of C and assembly, primarily in JavaScriptCore, and some Objective-C to integrate with Cocoa platforms. It’s a framework in macOS and iOS, and used by many first party and third party applications including Safari, Mail, Notes, Books, News, and App Store. WebKit is an open-source Web browser engine.
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