• Paolo Severini's avatar
    Reland "Faster JS-to-Wasm calls" · 6ada6a90
    Paolo Severini authored
    This is a reland of 860fcb1b
    
    - Disabled the tests for this feature in V8-lite mode (the original
    change broke V8-lite tests)
    - Also modified test console-profile-wasm.js that was brittle with this
    change because it assumed that there was always a JS-to-Wasm wrapper
    but this is not the case when the TurboFan compilation completes before
    the Liftoff-compiled code starts to run.
    
    More changes in Patchset 8:
    
    - Moved inlining of the "JSToWasm Wrapper" away from simplified-lowering,
    into a new phase, wasm-inlining that reuses the JSInliner reducer.
    The doc
    https://docs.google.com/document/d/1mXxYnYN77tK-R1JOVo6tFG3jNpMzfueQN1Zp5h3r9aM/edit#
    describes the new logic.
    
    - Fixed a couple of small issues in wasm_compiler.cc to make sure that
    the graph "JSToWasm Wrapper" subgraph has a valid Control chain;
    this should solve the problem we had inlining the calls in functions
    that can throw exception.
    
    
    Original change's description:
    > Faster JS-to-Wasm calls
    >
    > This replaces https://chromium-review.googlesource.com/c/v8/v8/+/2376165/.
    >
    > Currently JS-to-Wasm calls go through a wrapper/trampoline, built on
    > the basis of the signature of a Wasm function to call, and whose task
    > is to:
    > - set "thread_in_wasm_flag" to true
    > - convert the arguments from tagged types into Wasm native types
    > - calculate the address of the Wasm function to call and call it
    > - convert back the result from Wasm native types into tagged types
    > - reset "thread_in_wasm_flag" to false.
    >
    > This CL tries to improve the performance of JS-to-Wasm calls by
    > inlining the code of the JS-to-Wasm wrappers in the call site.
    >
    > It introduces a new IR operand, JSWasmCall, which replaces JSCall for
    > this kind of calls. A 'JSWasmCall' node is associated to
    > WasmCallParameters, which contain information about the signature of
    > the Wasm function to call.
    >
    > WasmWrapperGraphBuilder::BuildJSToWasmWrapper is modified to avoid generating code to convert the types for the arguments
    > of the Wasm function, when the conversion is not necessary.
    > The actual inlining of the graph generated for this wrapper happens in
    > the simplified-lowering phase.
    >
    > A new builtin, JSToWasmLazyDeoptContinuation, is introduced to manage
    > lazy deoptimizations that can happen if the Wasm function callee calls
    > back some JS code that invalidates the compiled JS caller function.
    >
    > Bug: v8:11092
    > Change-Id: I3174c1c1f59b39107b333d1929ecc0584486b8ad
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2557538
    > Reviewed-by: Igor Sheludko <ishell@chromium.org>
    > Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
    > Reviewed-by: Georg Neis (ooo until January 5) <neis@chromium.org>
    > Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
    > Reviewed-by: Maya Lekova <mslekova@chromium.org>
    > Reviewed-by: Andreas Haas <ahaas@chromium.org>
    > Commit-Queue: Paolo Severini <paolosev@microsoft.com>
    > Cr-Commit-Position: refs/heads/master@{#71824}
    
    Bug: v8:11092
    Cq-Include-Trybots: luci.v8.try:v8_linux_arm_lite_rel_ng
    Change-Id: I7d8523fa916bf4029a31f8c7a72bbd93336dc0b9
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2596784Reviewed-by: 's avatarGeorg Neis <neis@chromium.org>
    Reviewed-by: 's avatarAndreas Haas <ahaas@chromium.org>
    Reviewed-by: 's avatarNico Hartmann <nicohartmann@chromium.org>
    Reviewed-by: 's avatarMaya Lekova <mslekova@chromium.org>
    Reviewed-by: 's avatarIgor Sheludko <ishell@chromium.org>
    Commit-Queue: Paolo Severini <paolosev@microsoft.com>
    Cr-Commit-Position: refs/heads/master@{#72147}
    6ada6a90
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