• Ben L. Titzer's avatar
    [wasm] Support 4GiB memories in Liftoff · 352e408b
    Ben L. Titzer authored
    Add codegen support for up to 4GiB memories in Liftoff code.
    
    This CL also adds three new mjsunit tests that stress large WASM
    memories (1, 2, and 4 GiB) and checks that accesses near these
    boundaries properly generate traps.
    
    Note there is still some trickiness around the setting of:
      1.) the flag --wasm-max-mem-pages
      2.) wasm-limits.h kSpecMaxWasmMemoryPages = 65536
      3.) wasm-limits.h kV8MaxWasmMemoryPages = 32767
    
    In particular, the allocation of memories is still limited to
    3.) and the runtime flag can only lower this limit.
    
    The above means that the tests for 2GiB and 4GiB memories will silently
    OOM by design until 3.) is changed (though they currently pass with
    manual testing). I argue it is better to include these tests up front,
    since they will immediately trigger if their memory allocation succeeds.
    
    Therefore the plan is to lift the restriction on 3.) after removing
    all other other internal V8 limitations including array buffers and views.
    
    R=clemensh@chromium.org
    CC=mstarzinger@chromium.org
    BUG=v8:7881
    
    Change-Id: I3205ac2daf5c9a84364c670a2c3ef2258e5649f6
    Reviewed-on: https://chromium-review.googlesource.com/1151309
    Commit-Queue: Ben Titzer <titzer@chromium.org>
    Reviewed-by: 's avatarClemens Hammacher <clemensh@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#54754}
    352e408b
memory_2gb_oob.js 3.42 KB