Technical discussion part 2: constructing constants

Among other things, one interesting advantage of dynamically generated code is that constants can be embedded into the instruction stream. Think about it: there are several constants (usually pointers), which are unknown at compile time, but behave as constant once a value is assigned to them. Those constants can be embedded into the generated code, so several load-from-memory operations can be eliminated. WebKit JIT goes one step further: you can also rewrite constants which are not even known at JIT compilation time. Those constants typically hold cached values used by some fast cases.

Nitro-Extreme on ARM. What happens to nitro during extreme conditions?

Recently, a new branch has appeared in the WebKit trac, called Nitro-Extreme. I know the work has not been finished yet, but it never hurts to take a look at the current revision.

ARM support for JavaScript engine of WebKit

We have announced the ARM port of WebKit on webkit-dev mailing list in April. Additionally, a Bugzilla entry was opened for the technical discussion. After that we received several feedbacks which encouraged us to continue our work, but some feedbacks reported technical difficulties on getting and building our code. This post is going to summarize how to get and build the ARM port for your device.

Technical discussion part 1: interface between jit and C++

Perhaps one might think that this topic is not a big deal. We have a guideline, called ARM-EABI (Embedded Application Binary Interface). Among other things, this paper specifies which registers must be preserved, how the stack must be handled, etc. We just have to follow these rules, don't we?

The battle for the title: the fastest ARM JavaScript Engine. Round one.

There was a time, when Internet Explorer ruled the word, and browser developments were nearly stopped. Fortunately, Mozilla Foundation has brought us the Firefox and big waves appeared on the silent ocean. A fierce war has started since then: both in terms of speed and features. After some time other big names joined like Apple and Google. Using these new tools, the human creativity has changed the internet into a rich and beautiful place. (OK, it has dark sides as well).

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