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    • Andreas Haas's avatar
      [wasm] Load thread-in-wasm flag from the isolate · 148ef606
      Andreas Haas authored
      The existing implementation embedded an isolate-specific pointer to the
      thread-in-wasm flag in the wrapper code. However, when the module code
      is shared among multiple workers, this can mean that the workers
      share the same thread-in-wasm flag.
      
      With this change we load the pointer to the flag at runtime from the
      current isolate. Thereby the correct flag is used even when the same
      code is executed on different workers.
      
      Note that we could access the right flag address by going through the
      root register. However, changing the code generation to use the root
      register requires some inconvenient steps:
      * Pass the isolate to the pipeline again, which we don't want.
      * Change the WasmCallDescriptor to allow the use of the root register
        for wrappers but not for other code.
      To avoid these issues, and allow the CL to be easy to merge back, we
      got for the changes proposed here.
      
      R=mstarzinger@chromium.org, ishell@chromium.org
      
      Bug: v8:8533
      Change-Id: If15565a7ad7cba835cfc1628e7a4d3fdef90a5c0
      Reviewed-on: https://chromium-review.googlesource.com/c/1358518
      Commit-Queue: Andreas Haas <ahaas@chromium.org>
      Reviewed-by: 's avatarIgor Sheludko <ishell@chromium.org>
      Reviewed-by: 's avatarMichael Starzinger <mstarzinger@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#58044}
      148ef606