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  1. 12 Apr, 2017 3 commits
    • Sathya Gunasekaran's avatar
      [builtins] Change semantics of class constructors returning primitives · a7c4e778
      Sathya Gunasekaran authored 
      This change mirrors the semantics for derived class constructors. This
change doesn't affect non class constructors.

This change could potentially break web compat. More details:
https://github.com/tc39/ecma262/pull/469

Bug=v8:5536

Change-Id: I519599949523733332d0b35e4f8d9ecb01cac495
Reviewed-on: https://chromium-review.googlesource.com/461225Reviewed-by: 's avatarBenedikt Meurer <bmeurer@chromium.org>
Reviewed-by: 's avatarMichael Starzinger <mstarzinger@chromium.org>
Reviewed-by: 's avatarAdam Klein <adamk@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44594}
      a7c4e778
    • bmeurer's avatar
      Revert "[turbofan] Avoid going through ArgumentsAdaptorTrampoline for CSA/C++ builtins." · d98dfd8b
      bmeurer authored 
      This reverts commit 9df5674b because it
is not compatible with the way that Array.prototype.reduceRight and
Array.prototype.reduce deal with optional parameters at this point (i.e.
parameters where the behavior is different depending on whether the
parameter was skipped or undefined was passed).

In general, it might be better to not adapt arguments for builtins with
optional paramters, that are likely skipped, for example as in
Object.create or Array.prototype.reduce. Since that will require
arguments adaptor frames for normal calls, especially from baseline
code. Instead it might make sense to use the variadic arguments support
in the CodeStubAssembler instead to avoid the arguments adaptor in all
cases (not only when called from TurboFan optimized code).

BUG=v8:5267,chromium:709782,chromium:707992,chromium:708282,chromium:708599,chromium:709173,chromium:709747,chromium:707065,chromium:710417
TBR=danno@chromium.org

Review-Url: https://codereview.chromium.org/2817653002
Cr-Commit-Position: refs/heads/master@{#44593}
      d98dfd8b
    • mtrofin's avatar
      [wasm] instantiate expressed in terms of compile · 7829af32
      mtrofin authored 
      Today, the semantics of:

WebAssembly.instantiate

and

WebAssembly.compile().then(new WebAssemblyInstance)

are subtly different, to the point where attempting the proposed
change uncovered bugs.

In the future, it's possible that .instantiate actually have different
semantics - if we pre-specialized to the provided ffi, for example.
Right now that's not the case.

This CL:
- gets our implementation closer to what developers may write using
the compile -> new Instance alternative, in particular wrt promise
creation. By reusing code paths, we uncover more bugs, and keep
maintenance cost lower.

- it gives us the response-based WebAssembly.instantiate implicitly.
Otherwise, we'd need that same implementation on the blink side. The
negative is maintenance: imagine if the bugs I mentioned could only be
found when running in Blink.

BUG=chromium:697028

Review-Url: https://codereview.chromium.org/2806073002
Cr-Commit-Position: refs/heads/master@{#44592}
      7829af32
  3. 11 Apr, 2017 37 commits