• clemensh's avatar
    [wasm] Introduce WasmStackGuard builtin · b6bfe7b9
    clemensh authored
    Instead of placing a runtime call to StackGuard in the compiled wasm
    code, we just call the builtin, which is cheaper. By passing Smi::kZero
    as context, we save even more code space and avoid embedding the
    context in the code.
    The WasmStackGuard builtin then calls the new WasmStackGuard runtime
    function, which gets the context from the instance attached to the
    calling wasm code, and then does the usual StackGuard logic.
    
    For the unity benchmark in asm-wasm mode, generated code size reduces
    from 63.0 to 61.6 MB (-2.1%).
    
    R=titzer@chromium.org, ahaas@chromium.org, mstarzinger@chromium.org
    
    Review-Url: https://codereview.chromium.org/2691993004
    Cr-Commit-Position: refs/heads/master@{#43277}
    b6bfe7b9
v8.gyp 85.1 KB