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    • Clemens Hammacher's avatar
      [wasm] Split jump table and lazy compile table · 56eaec9d
      Clemens Hammacher authored 
      We had both jump slots and lazy compile slots in the same table. This
increases the space per slot to the maximum of the two, even though we
often do not use lazy compilation and could have smaller jump slots.
This CL splits the two into two separate tables. The lazy compile table
will only be created on demand, and will never be patched.
The jump table now only contains jumps, and is more compact (which
might improve performance because of improved locality).

R=mstarzinger@chromium.org

Bug: v8:9477
Change-Id: Ie182873a1ec612f71d1b54447021a9a8f8ca59db
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1698393Reviewed-by: 's avatarMichael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62707}
      56eaec9d
  33. 21 May, 2019 1 commit
  35. 17 Apr, 2019 1 commit
  37. 27 Mar, 2019 1 commit
  39. 01 Mar, 2019 1 commit
  41. 15 Feb, 2019 1 commit
  43. 13 Feb, 2019 1 commit
  45. 07 Feb, 2019 1 commit
  47. 17 Jan, 2019 1 commit
  49. 08 Aug, 2018 1 commit
  51. 07 Aug, 2018 2 commits
  53. 06 Aug, 2018 1 commit
  55. 06 Jul, 2018 1 commit
  57. 21 Jun, 2018 1 commit
  59. 20 Jun, 2018 2 commits
    • Predrag Rudic's avatar
      MIPS[64] Port "[wasm] Introduce jump table" · e0ddc6d2
      Predrag Rudic authored 
      Port of 733b7c82

Original description:
> [wasm] Introduce jump table
>
> This introduces the concept of a jump table for WebAssembly, which is
> used for every direct and indirect call to any WebAssembly function.
> For lazy compilation, it will initially contain code to call the
> WasmCompileLazy builtin, where it passes the function index to be
> called.
> For non-lazy-compilation, it will contain a jump to the actual code.
> The jump table allows to easily redirect functions for lazy
> compilation, tier-up, debugging and (in the future) code aging. After
> this CL, we will not need to patch existing code any more for any of
> these operations.
>
> R=mstarzinger@chromium.org, titzer@chromium.org
>
> Bug: v8:7758
> Change-Id: I45f9983c2b06ae81bf5ce9847f4542fb48844a4f
> Reviewed-on: https://chromium-review.googlesource.com/1097075
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Ben Titzer <titzer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53805}

Change-Id: Ifa7c2abe89a6dc5dbb03a547db2fab68e292f344
Reviewed-on: https://chromium-review.googlesource.com/1107630
Commit-Queue: Sreten Kovacevic <sreten.kovacevic@mips.com>
Reviewed-by: 's avatarIvica Bogosavljevic <ivica.bogosavljevic@mips.com>
Reviewed-by: 's avatarClemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53893}
      e0ddc6d2
    • Ben L. Titzer's avatar
      [asm] Rework Assembler::IsolateData into Assembler::Options · 4252d53f
      Ben L. Titzer authored 
      This CL attempts to simplify the Assembler's dependency on the
isolate, in particular on a global "serializer_enabled" mode contained
therein. The "serializer_enabled" condition enabled and disabled
a number of things in both the assemblers and macro assemblers. To
make these dependencies explicit, the Assembler::IsolateData is refactored
to be a proper Assembler::Options struct that controls specific assembler
behaviors, with default settings easily computable from the isolate.

This also helps make the contract for compiling WASM code more explicit
(since WASM code needs to have reloc info recorded for external references)
we can explicitly enable this recording without trying to "trick" the
assembler using "serializer_enabled".

R=jgruber@chromium.org
CC=mstarzinger@chromium.org, herhut@chromium.org

Change-Id: I7a8ba49df7b75b292d73ec2aa6e507c27a3d99c8
Reviewed-on: https://chromium-review.googlesource.com/1105982
Commit-Queue: Ben Titzer <titzer@chromium.org>
Reviewed-by: 's avatarJakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53890}
      4252d53f
  61. 19 Jun, 2018 3 commits
    • Junliang Yan's avatar
      PPC/s390: [wasm] Introduce jump table · eafcdc96
      Junliang Yan authored 
      Port 733b7c82

Original Commit Message:

    This introduces the concept of a jump table for WebAssembly, which is
    used for every direct and indirect call to any WebAssembly function.
    For lazy compilation, it will initially contain code to call the
    WasmCompileLazy builtin, where it passes the function index to be
    called.
    For non-lazy-compilation, it will contain a jump to the actual code.
    The jump table allows to easily redirect functions for lazy
    compilation, tier-up, debugging and (in the future) code aging. After
    this CL, we will not need to patch existing code any more for any of
    these operations.

R=clemensh@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG= v8:7758

Change-Id: I1a370910ffa56dbdd609be6922067842a6adf1df
Reviewed-on: https://chromium-review.googlesource.com/1105060
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: 's avatarClemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53852}
      eafcdc96
    • Clemens Hammacher's avatar
      [wasm] Fix jump table for long jumps on arm · d5177a02
      Clemens Hammacher authored 
      Direct jumps only work for offset up to 64 MB on arm. For longer jumps,
use indirect branches (load target from constant pool into the pc
register).

R=mstarzinger@chromium.org
CC=pierre.langlois@arm.com

Bug: v8:7758
Change-Id: I1cf66b7d1bfb62cfcd6b1619c02816909a1f651e
Reviewed-on: https://chromium-review.googlesource.com/1105996
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: 's avatarMichael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53847}
      d5177a02
    • Clemens Hammacher's avatar
      Reland "[wasm] Introduce jump table" · 5f56641b
      Clemens Hammacher authored 
      This is a reland of 733b7c82.
The arm64 bug was fixed in https://crrev.com/c/1105051.

Original change's description:
> [wasm] Introduce jump table
>
> This introduces the concept of a jump table for WebAssembly, which is
> used for every direct and indirect call to any WebAssembly function.
> For lazy compilation, it will initially contain code to call the
> WasmCompileLazy builtin, where it passes the function index to be
> called.
> For non-lazy-compilation, it will contain a jump to the actual code.
> The jump table allows to easily redirect functions for lazy
> compilation, tier-up, debugging and (in the future) code aging. After
> this CL, we will not need to patch existing code any more for any of
> these operations.
>
> R=mstarzinger@chromium.org, titzer@chromium.org
>
> Bug: v8:7758
> Change-Id: I45f9983c2b06ae81bf5ce9847f4542fb48844a4f
> Reviewed-on: https://chromium-review.googlesource.com/1097075
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Ben Titzer <titzer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#53805}

TBR=titzer@chromium.org,mstarzinger@chromium.org

Bug: v8:7758
Change-Id: I68555230c6db97e70f0b8fef784188f55ee04794
Reviewed-on: https://chromium-review.googlesource.com/1105158
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: 's avatarClemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53829}
      5f56641b