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    • Junliang Yan's avatar
      PPC/s390: [async] Introduce dedicated JSAsyncFunctionObject. · 71898faf
      Junliang Yan authored 
      Port a63987a4

Original Commit Message:

    This JSAsyncFunctionObject represents the implicit generator object
    inside of async functions, and also holds the outer promise for the
    async functions. This in turn allows us to get rid of the .promise
    in the Parser / BytecodeGenerator completely, and will make it
    possible to build zero-cost async stack traces independent of the
    concrete synchronous part of the stack frame (which currently breaks
    in Node.js).

    In the bytecode all the async function operations now take this new
    JSAsyncFunctionObject instead of passing both the .generator_object
    and the .promise, which further simplifies and shrinks the bytecode.
    It also reduces the size of async function frames, potentially making
    the suspend/resume cheaper.

    This also changes `await` to use intrinsics instead of calling to
    special JSFunctions on the native context, and thus reduces the size of
    the native contexts.

    to TurboFan.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ife0aa45b11580f316e657942485907cf78336e4b
Reviewed-on: https://chromium-review.googlesource.com/c/1276867
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: 's avatarJoran Siu <joransiu@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#56581}
      71898faf
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    • jgruber's avatar
      Remove isolate parameter from RecordWrite builtin · 62766423
      jgruber authored 
      The isolate can be efficiently loaded through other means: either as a
root-relative load (if embedded builtins are enabled), or as an embedded
external reference (i.e. the absolute pointer is included in the
instruction stream) otherwise.

The generated code should be at least as fast as previously. On x64
(with embedded builtins):

Before:
 // Register moves in prologue:
 0x7f47a6b4860a     a  488955e0       REX.W movq [rbp-0x20],rdx
 // And the load from a stack slot at each use-site.
 0x7f47a6b486f2    f2  488b7de0       REX.W movq rdi,[rbp-0x20]

After:
 // Each use-site just loads a root-relative offset.
 0x7f1645fcc6ce    ee  498dbd38ffffff REX.W leaq rdi,[r13-0xc8]

On ia32 (no embedded builtins), before:
 0x5c608930    10  8955f0         mov [ebp-0x10],edx
 0x5c6089fb    db  891424         mov [esp],edx

After:
 0x41d0898d    8d  b80033b156     mov eax,0x56b13300

Removal reduces register pressure, and frees up ebx as the root register
on ia32.

Note that the set of allocatable registers was only reduced on ia32 to
exclude the root register.

Bug: v8:6666
Change-Id: I14e401e2823c82042c76acae10c3c935b9982993
Reviewed-on: https://chromium-review.googlesource.com/1201586
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: 's avatarUlan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55587}
      62766423
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