[webkit-dev] Offline Assembler build step always computes hashes even when nothing changes

Filip Pizlo fpizlo at apple.com
Mon Sep 17 07:49:18 PDT 2018

> On Sep 16, 2018, at 8:48 PM, Darin Adler <darin at apple.com> wrote:
>> On Sep 16, 2018, at 5:59 PM, Filip Pizlo <fpizlo at apple.com> wrote:
>> Which offline assembler build step are you referring to?
> The one that is the “Offline Assembler” target in Xcode, which runs this command:
> ruby JavaScriptCore/offlineasm/asm.rb JavaScriptCore/llint/LowLevelInterpreter.asm "${BUILT_PRODUCTS_DIR}/JSCLLIntOffsetsExtractor” LLIntAssembly.h
> For a “nothing rebuild” of all of WebKit and all of Safari for iOS on my iMac, it takes about 10 seconds out of a 30 second total “build" time.
> Looking more carefully at the build log now, it seems that recompiling LLIntOffsetExtractor.cpp is also taking multiple seconds. Not executing generate_offset_extractor.rb, but compiling the output.

Does every build that you do rebuild LLIntOffsetExtractor.cpp?  Including a clean build?


> — Darin
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