Posted this mail to webkit-dev mailing list too :) On Wed, Aug 29, 2018 at 3:19 AM Yusuke Suzuki <yusukesuz...@slowstart.org> wrote:
> Hi JSC folks, > > In Wasm supported environment, our MemoryMode is a bit dynamic. > When we fail to allocate WasmMemory for signaling mode, we fall back to > the bound checking memory instead. > > But Wasm code compiled for signaling / bound checking is incompatible. If > the code is compiled > as signaling mode, and if we attach the memory for bound checking, we need > to recompile the > code for bound checking mode. This introduces significant complexity to > our wasm compilation. > And our WebAssembly.compile is not basically compiling: it is just > validating. > Actual compiling needs to be deferred until the memory is attached by > instantiating. > It is not good when we would like to share WasmModule among multiple wasm > threads / workers in the future, since the "compiled" Wasm module is not > actually compiled. > > So, my proposal is, can we explore the way to exclusively support one of > MemoryMode in a certain architecture? > For example, in x64, enable signaling mode, and we report OOM errors if we > fail to allocate WasmMemory with signaling mode. > > Best regards, > Yusuke Suzuki >
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