Hi dan, Glad to hear things are working for you. The functions you're looking at are intrinsic/runtime functions, and that syntax is the "natives" syntax, enabled for user code with the "--allow-natives-syntax" flag. Some people have used this in the past to e.g. track optimisation behaviour, like this (no longer in-date) documentation from bluebird <https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#1-tooling> .
Those functions are found in C++, not in Javascript, as they are runtime calls. They are declared in src/runtime/runtime.h, where you can also find the documentation of the %Foo and %_Foo syntax. The definitions are in the .cc files under src/runtime, prefixed with "Runtime_" -- e.g. %GetArrayKeys is defined in runtime-array.cc <https://cs.chromium.org/chromium/src/v8/src/runtime/runtime-array.cc?l=455&rcl=a3d09098655de3c43eec029fec2a766d63f36caf> (btw, https://cs.chromium.org/ is a great way of browsing the code). Similarly you can find the C++ definition of %IsSmi by searching for Runtime_IsSmi <https://cs.chromium.org/search/?q=Runtime_IsSmi>. %_IsSmi, with the underscore, is an inlined intrinsic (specifically, an intrinsic that *can* be inlined by the compiler). In the interpreter, for example, this is in the supported intrinsics list <https://cs.chromium.org/chromium/src/v8/src/interpreter/interpreter-intrinsics.h?l=16&rcl=a3d09098655de3c43eec029fec2a766d63f36caf>, so we output an InvokeIntrinsic bytecode <https://cs.chromium.org/chromium/src/v8/src/interpreter/bytecode-array-builder.cc?l=1407&rcl=a3d09098655de3c43eec029fec2a766d63f36caf> rather than a runtime call bytecode, which has an generated assembly handler which, during execution, dispatches on the intrinsic's id <https://cs.chromium.org/chromium/src/v8/src/interpreter/interpreter-intrinsics-generator.cc?l=98&rcl=a3d09098655de3c43eec029fec2a766d63f36caf> and for IsSmi does the Smi check <https://cs.chromium.org/chromium/src/v8/src/interpreter/interpreter-intrinsics-generator.cc?l=189&rcl=a3d09098655de3c43eec029fec2a766d63f36caf>. The optimizing compiler has similar logic. Hope that helps -- V8 is a complex codebase due to the interplay between C++, javascript, generated assembly, etc., so don't expect to be able to easily find where everything is defined or how everything works without serious digging. - Leszek On Mon, Aug 20, 2018 at 6:14 PM dan Med <litokis.ta...@gmail.com> wrote: > How do these function get called > %GetArrayKeys > cause i can't seem to find them in the /src/array.js > as well as %_IsSmi in the same file > > 2018-08-20 19:04 GMT+02:00 dan Med <litokis.ta...@gmail.com>: > >> Yes i will use it >> >> >> 2018-08-20 15:57 GMT+02:00 <danny.p...@gmail.com>: >> >>> I have uploaded a .Net 4.5 application that I wrote over the weekend to >>> configure and build V8. It's available here: V8Builder >>> <https://github.com/dannypike/V8Builder>. >>> >>> In the README are TL;DR-style instructions if you don't want to use the >>> GUI (or can't build it and don't have a friend with a C# compiler). >>> >>> I gave up trying to write simple instructions, it was much easier to >>> write an application instead. >>> >>> Hope it helps, >>> >>> Dan >>> >>> -- >>> -- >>> v8-dev mailing list >>> v8-dev@googlegroups.com >>> http://groups.google.com/group/v8-dev >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "v8-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to v8-dev+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> > -- > -- > v8-dev mailing list > v8-dev@googlegroups.com > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-dev+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-dev mailing list v8-dev@googlegroups.com http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-dev+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
