After multiplying two integers we emit code like:

  if (result == 0) {
    if (OR_OPERATION(rhs, lhs) < 0) {
      DEOPT;
    }
  }

This CL allows us to eliminate the OR and comparison if either rhs or
lhs is a negative number, reducing the code to:

  if (result == 0) DEOPT;

BUG=

Review-Url: https://codereview.chromium.org/2167643002
Cr-Commit-Position: refs/heads/master@{#38016}

Turn the LoadElimination into a proper graph Reducer so that it can run
together with ValueNumbering and RedundancyElimination to a fixpoint
for maximum load/check elimination. This also adds initial support for
eliminating redundant LoadElement/StoreElement nodes.

BUG=v8:4930,v8:5141

Review-Url: https://codereview.chromium.org/2164253002
Cr-Commit-Position: refs/heads/master@{#38015}

BUG=chromium:630952

Review-Url: https://codereview.chromium.org/2177193002
Cr-Commit-Position: refs/heads/master@{#38014}

Fix failure in mjsunit/regress/regress-5213. When bailout happens,
the double registers are not properly loaded if exponent_type() is
INTEGER (this happens in optimized version of code only).

BUG=mjsunit/regress/regress-5213

Review-Url: https://codereview.chromium.org/2175633003
Cr-Commit-Position: refs/heads/master@{#38013}

BUG=v8:5197

Review-Url: https://codereview.chromium.org/2168273004
Cr-Commit-Position: refs/heads/master@{#38012}

BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2182443002
Cr-Commit-Position: refs/heads/master@{#38011}

Move the logic for allocating the global declaration pair array
from VisitDeclarations to a later step. This is required for
concurrent bytecode generation.

This change requires adding support for reserving fixed
constant pool array entries, which can be later updated
with the value of the literal.

BUG=v8:5203

Review-Url: https://codereview.chromium.org/2167763003
Cr-Commit-Position: refs/heads/master@{#38010}

R=ishell@chromium.org,bmeurer@chromium.org
TBR=rossberg@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2175233003
Cr-Commit-Position: refs/heads/master@{#38009}

Introducing machine operators early causes trouble for the typing,
truncation analysis and representation selection, so we should rather
stick to simplified operators instead. Now there's only the for-in case
left, which is not clear how we can handle this in a better way.

Drive-by-fix: Also don't introduce Int32Constant and Word32Shl in
JSTypedLowering, but use NumberConstant and proper NumberShiftLeft
operators instead.

R=jarin@chromium.org
BUG=chromium:630951

Review-Url: https://codereview.chromium.org/2182453002
Cr-Commit-Position: refs/heads/master@{#38008}

R=bmeurer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2173403002
Cr-Commit-Position: refs/heads/master@{#38007}

Revert of [heap] Remove black pages and use black areas instead. (patchset #6 id:100001 of https://codereview.chromium.org/2160613002/ )

Reason for revert:
Suspected to cause crbug.com/630969

Original issue's description:
> [heap] Remove black pages and use black areas instead.
>
> BUG=630386
> LOG=n
>
> Committed: https://crrev.com/b008a0d5a3db80a854cb93d9c94d67bf2d780f2c
> Cr-Commit-Position: refs/heads/master@{#37967}

TBR=ulan@chromium.org,hpayer@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=630386

Review-Url: https://codereview.chromium.org/2176133002
Cr-Commit-Position: refs/heads/master@{#38006}

TBR=jgruber@chromium.org

Review-Url: https://codereview.chromium.org/2177183002
Cr-Commit-Position: refs/heads/master@{#38005}

BUG=
R=danno

Review-Url: https://codereview.chromium.org/2169023002
Cr-Commit-Position: refs/heads/master@{#38004}

- Remove duplicated CSS.
- Expand landing area of upload button.
- Give the toolbox a transparent white background.
- Make the phase-select box look nicer before file load.
- Remove the margin at the top of the screen.

The height of the margin was exactly the height of span#graph-toolbox,
and due to the semantics of position:relative, space was reserved for it
at the top of div#middle.

BUG=
R=danno

Review-Url: https://codereview.chromium.org/2164373002
Cr-Commit-Position: refs/heads/master@{#38003}

Always use the BytecodeGraphBuilder when the  --turbo-from-bytecode
is enabled, assuming the function should be compiled for Ignition.
Adds a new MaybeOptimizeIgnition function to runtime-profiler
which is called if the function should be optimized from bytecode
rather than going via full-codegen.

BUG=v8:4280

Committed: https://crrev.com/9ca7db914be88e6792a88eab4a1988ee031d70c4
Review-Url: https://codereview.chromium.org/2156753002
Cr-Original-Commit-Position: refs/heads/master@{#37921}
Cr-Commit-Position: refs/heads/master@{#38002}

Skip test-run-load-store/RunUnalignedLoadStoreUnalignedAccess on ARM until
UnalignedLoad and UnalignedStore operators get implemented

NOTRY=true

Review-Url: https://codereview.chromium.org/2182433002
Cr-Commit-Position: refs/heads/master@{#38001}

BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2171263002
Cr-Commit-Position: refs/heads/master@{#38000}

The third attempt never landed :). This attempt completely reworks
the logic to attempt to be clearer and more obviously correct. This
attempt also actually had unit tests written for it (see bug 625353).

R=machenbach@chromium.org
BUG=625353, 629825
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_compile_x86_dbg,android_compile_mips_dbg,android_arm64_dbg_recipe

Review-Url: https://codereview.chromium.org/2173343002
Cr-Commit-Position: refs/heads/master@{#37999}

This patch parametrizes AstTraversalVisitor by the actual subclass,
in a similar way as AstVisitor is parametrized.  This allows a
subclass to, e.g., override the Visit method and still use the
traversal mechanism.  It also allows the subclass to override the
specific visiting methods, without them being virtual.

This patch also removes AstExpressionVisitor, subsuming its
functionality in AstTraversalVisitor.

R=adamk@chromium.org, verwaest@chromium.org
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2169833002
Cr-Commit-Position: refs/heads/master@{#37998}

Exception throwing will allocate

R=bmeurer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2173423002
Cr-Commit-Position: refs/heads/master@{#37997}

R=littledan@chromium.org
BUG=chromium:630559

Review-Url: https://codereview.chromium.org/2176613002
Cr-Commit-Position: refs/heads/master@{#37996}

The dead code elimination in SimplifiedLowering can eliminate pure nodes
if they don't have value uses. But some of those can indeed have control
inputs, i.e. Phi nodes do of course have a control input.

R=jarin@chromium.org
BUG=chromium:630923

Review-Url: https://codereview.chromium.org/2177133002
Cr-Commit-Position: refs/heads/master@{#37995}

BUG=chromium:630611

Review-Url: https://codereview.chromium.org/2177483002
Cr-Commit-Position: refs/heads/master@{#37994}

In PrependElementIndicesImpl we sort a FixedArray of indices potentially
containing HeapNumbers. During the string conversion we might trigger a GC.
This in turn might try to read a slot where we previously had a HeapNumber
but the sort sneaked a SMI in there which is not a valid pointer.

BUG=chromium:630561

Review-Url: https://codereview.chromium.org/2173653003
Cr-Commit-Position: refs/heads/master@{#37993}

Rolling v8/build to 2c67d4d74b6b3673228fab191918500a582ef3b0

Rolling v8/third_party/android_tools to e4d61eb8f463e6cb8d1e1269a15c22f7c9bbd122

Rolling v8/tools/clang to 496622ab4aaa5be7e5a9b80617013cb02f45dc87

Rolling v8/tools/mb to 0c4dc43c454f26936ddf3074ab8e9a41e3dc03a3

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review-Url: https://codereview.chromium.org/2173293002
Cr-Commit-Position: refs/heads/master@{#37992}

Port ba092fb0

Original commit message:

    So far we don't have a useful way to inline Math.max or Math.min in
    TurboFan optimized code. This adds new operators NumberMax and NumberMin
    and changes the Float64Max/Float64Min operators to have JavaScript
    semantics instead of the C++ semantics that it had previously.

    This also removes support for recognizing the tenary case in the
    CommonOperatorReducer, since that doesn't seem to have any positive
    impact (and actually doesn't show up in regular JavaScript, where
    people use Math.max/Math.min instead).

    Drive-by-fix: Also nuke the unused Float32Max/Float32Min operators.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2179503003
Cr-Commit-Position: refs/heads/master@{#37991}

The uses_arguments() bool is not needed for correct
behavior, since that same information is available after scope analysis
based on whether we allocated the Scope::arguments_ var.

BUG=v8:5209

Review-Url: https://codereview.chromium.org/2168293002
Cr-Commit-Position: refs/heads/master@{#37990}

This replaces the AstVisitor approach for scope rewriting with a Scope-only
solution, using a new Scope::Snapshot object that keeps track of inner scopes,
unresolved variables, and temps.

The only use of the AstVisitor is now for parameter varblock scopes introduced
due to sloppy eval in parameters, which greatly simplifies the rewriter
as it no longer needs to handle temps. A future CL may be able to
eliminate it altogether by taking a snapshot per function argument.

Based on verwaest's https://codereview.chromium.org/2166023002/.

BUG=v8:5226

Review-Url: https://codereview.chromium.org/2171703004
Cr-Commit-Position: refs/heads/master@{#37989}

Implement UnalignedLoad and UnalignedStore optional
turbofan operators and use them in WasmCompiler for unaligned
memory access.

BUG=

Review-Url: https://codereview.chromium.org/2122853002
Cr-Commit-Position: refs/heads/master@{#37988}

BUG=v8:5134
R=cbruni@chromium.org, littledan@chromium.org, neis@chromium.org

Review-Url: https://codereview.chromium.org/2131383002
Cr-Commit-Position: refs/heads/master@{#37987}

This reverts commit 31388627.

BUG=chromium:630629

Review-Url: https://codereview.chromium.org/2171373002
Cr-Commit-Position: refs/heads/master@{#37986}

TC-39 recently decided to remove the Python-based testing harness from the
Test262 project [1]. The code has been duplicated in a standalone project;
update V8's dependencies to fetch from that new location. This is based on
an earlier patch by Mike Pennisi.

[1] https://github.com/tc39/tc39-notes/blob/2b9722db9b90011d6083a5f1c8ff1559cbe01c0b/es7/2016-05/may-25.md

BUG=v8:5078

Review-Url: https://codereview.chromium.org/2131743002
Cr-Commit-Position: refs/heads/master@{#37985}

Revert of Re-land "Fix double-building of v8 in GN builds" (patchset #2 id:20001 of https://codereview.chromium.org/2171083003/ )

Reason for revert:
Reverted, because it breaks some funky android build.

Can reproduce breakage locally, w/ args.gn as follows:
disable_brotli_filter = true
disable_file_support = true
disable_ftp_support = true
enable_websockets = false
ffmpeg_branding = "Chrome"
is_component_build = false
is_debug = true
proprietary_codecs = true
symbol_level = 1
target_cpu = "x86"
target_os = "android"
use_goma = true
use_platform_icu_alternatives = true

This ends up building the mkpeephole tool w/ an architecture that won't run on the build machine.

Original issue's description:
> Re-land "Fix double-building of v8 in GN builds"
>
> This re-lands r37926 w/ the needed fix for cross-compiles; we
> can only re-use the default toolchain when the host can actually
> run it.
>
> R=machenbach@chromium.org
> BUG=629825
>
> Committed: https://crrev.com/5b762044b53f988fa9a534fe1a84f9938b3abd75
> Cr-Commit-Position: refs/heads/master@{#37970}

TBR=machenbach@chromium.org,dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=629825

Review-Url: https://codereview.chromium.org/2175693003
Cr-Commit-Position: refs/heads/master@{#37984}

BUG=chromium:619016

Review-Url: https://codereview.chromium.org/2139373002
Cr-Commit-Position: refs/heads/master@{#37983}

TBR=machenbach@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2174613003
Cr-Commit-Position: refs/heads/master@{#37982}

BUG=

Review-Url: https://codereview.chromium.org/2163823004
Cr-Commit-Position: refs/heads/master@{#37981}

Next step will be to add methods for parsing and then compiling.

BUG=v8:5215
R=marja@chromium.org

Review-Url: https://codereview.chromium.org/2171323002
Cr-Commit-Position: refs/heads/master@{#37980}

BUG=
R=hpayer@chromium.org

Review-Url: https://codereview.chromium.org/2171313002
Cr-Commit-Position: refs/heads/master@{#37979}

BUG=v8:5216
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2175603003
Cr-Commit-Position: refs/heads/master@{#37978}

This is not in use yet, but will be soon.

R=jochen@chromium.org, machenbach@chromium.org
BUG=chromium:580337

Review-Url: https://codereview.chromium.org/2175653002
Cr-Commit-Position: refs/heads/master@{#37977}