port 0a0fe8fb (r37476)

  original commit message:
  Import fdlibm versions of acos, acosh, asin and asinh, which are more
  precise and produce the same result across platforms (we were using
  libm versions for asin and acos so far, where both speed and precision
  depended on the operating system so far). Introduce appropriate TurboFan
  operators for these functions and use them both for inlining and for the
  generic builtin.

  Also migrate the Math.imul and Math.fround builtins to TurboFan builtins
  to ensure that their behavior is always exactly the same as the inlined
  TurboFan version (i.e. C++ truncation semantics for double to float
  don't necessarily meet the JavaScript semantics).

  For completeness, also migrate Math.sign, which can even get some nice
  love in TurboFan.

  Drive-by-fix: Some alpha-sorting on the Math related functions, and
  cleanup the list of Math intrinsics that we have to export via the
  native context currently.

BUG=

Review-Url: https://codereview.chromium.org/2122643002
Cr-Commit-Position: refs/heads/master@{#37496}

[crankshaft] Use canonical nan_value or minus_zero_value objects instead of constant heap numbers with NaN or -0.0 values.

BUG=chromium:625547

Review-Url: https://codereview.chromium.org/2115413002
Cr-Commit-Position: refs/heads/master@{#37495}

  The CL #37448 (https://codereview.chromium.org/2105313002) exposed one hidden bug in x87 turbofan compiler's code generation.

  This CL fixed that bugs.

BUG=

Review-Url: https://codereview.chromium.org/2117003002
Cr-Commit-Position: refs/heads/master@{#37494}

The re-typer now only types a node if its inputs are all typed with the
exception of phi nodes. This works because all cycles in the graph have
to contain a phi node.

BUG=chromium:625558

Review-Url: https://codereview.chromium.org/2120243002
Cr-Commit-Position: refs/heads/master@{#37493}

BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2109293004
Cr-Commit-Position: refs/heads/master@{#37492}

  port cede9ce5 (r37424)

  original commit message:

BUG=

Review-Url: https://codereview.chromium.org/2118133002
Cr-Commit-Position: refs/heads/master@{#37491}

  port 5febc27b (r37416)

  original commit message:
  Prior to this commit, calls to C++ builtins created standard exit
  frames, which are skipped when constructing JS stack traces. In order to
  show these calls on traces, we introduce a new builtin exit frame type.

  Builtin exit frames contain target and new.target on the stack and are
  not skipped during stack trace construction.

BUG=

Review-Url: https://codereview.chromium.org/2120873002
Cr-Commit-Position: refs/heads/master@{#37490}

  port c0d4bb89 (r37370)

  original commit message:
  Operand(reg) -> reg
  Operand(reg, 0) -> [reg]

BUG=

Review-Url: https://codereview.chromium.org/2119103002
Cr-Commit-Position: refs/heads/master@{#37489}

Since python3 does not use the old print statement, it may not be able
to load gdb-v8-support.py script in gdb as below:

  (gdb) source tools/gdb-v8-support.py
    File "tools/gdb-v8-support.py", line 170
      print result
                 ^
  SyntaxError: Missing parentheses in call to 'print'

This fixes print statement for both python2 and python3.

R=jochen@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2084163004
Cr-Commit-Position: refs/heads/master@{#37488}

Revert of Amends the TypedArray constructor to use the path for primitives for all (patchset #4 id:60001 of https://codereview.chromium.org/2096873002/ )

Reason for revert:
Speculative revert to unblock roll https://codereview.chromium.org/2114113002/

Original issue's description:
> Amends the TypedArray constructor to use the path for primitives for all
> types of primitives, not just undefined, booleans, numbers, and strings.
> (The missing cases were null and Symbol.) This is required by the
> specification, and there are test262 tests which we were failing due to
> this bug.
>
> BUG=v8:5124
>
> Committed: https://crrev.com/f788bd9cce19815cba746e47bb65abfe25c16208
> Committed: https://crrev.com/f772c22cd1c492aa0235a8e6012d0386146d2eb2
> Cr-Original-Commit-Position: refs/heads/master@{#37234}
> Cr-Commit-Position: refs/heads/master@{#37407}

TBR=littledan@chromium.org,bakkot@google.com
NOTREECHECKS=true
BUG=v8:5124

Review-Url: https://codereview.chromium.org/2120763002
Cr-Commit-Position: refs/heads/master@{#37487}

Rolling v8/build to 76d9f8b4fcae07fb82f28295468cf92bade935bd

Rolling v8/buildtools to db6179b29f90d28026b0cb23ef71d56ec31b8bd6

Rolling v8/tools/clang to 775e2f874b9f53f0e82c4e7c61dc29f3cdcb3379

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

Review-Url: https://codereview.chromium.org/2117993002
Cr-Commit-Position: refs/heads/master@{#37486}

BUG=v8:4663
R=littledan@chromium.org, adamk@chromium.org

Review-Url: https://codereview.chromium.org/2116053003
Cr-Commit-Position: refs/heads/master@{#37485}

Corrects a small problem with the current implementation of the AsyncFunction
constructor.

See https://tc39.github.io/ecmascript-asyncawait/#async-function-constructor for
details.

BUG=v8:4483
R=littledan@chromium.org, adamk@chromium.org, jwolfe@igalia.com

Review-Url: https://codereview.chromium.org/2118653004
Cr-Commit-Position: refs/heads/master@{#37484}

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2117703003
Cr-Commit-Position: refs/heads/master@{#37483}

This patch implements "immutable prototype exotic objects" from the ECMAScript
spec, which are objects whose __proto__ cannot be changed, but are not otherwise
frozen. They are introduced in order to prevent a Proxy from being introduced
to the prototype chain of the global object.

The API is extended by a SetImmutablePrototype() call in ObjectTemplate, which
can be used to vend new immutable prototype objects. Additionally, Object.prototype
is an immutable prototype object.

In the implementation, a new bit is added to Maps to say whether the prototype is
immutable, which is read by SetPrototype. Map transitions to the immutable prototype
state are not saved in the transition tree because the main use case is just for
the prototype chain of the global object, which there will be only one of per
Context, so no need to take up the extra word for a pointer in each full transition
tree.

BUG=v8:5149

Review-Url: https://codereview.chromium.org/2108203002
Cr-Commit-Position: refs/heads/master@{#37482}

Port b86ac0e0

Original commit message:
Both of these were broken in different ways:
* On arm, the loop counter was passed as argc on the stack.
* On arm64, we passed argc + 1 instead of argc.

The result in both cases was an incorrect receiver for the builtin frame
when generating stack traces.

BUG=v8:4815

Review-Url: https://codereview.chromium.org/2120463002
Cr-Commit-Position: refs/heads/master@{#37481}

This makes the elimination of checkpoints flowing effect-wise into nodes
having the {Return} operator more permissive. We can cut out checkpoints
even when they are not wholly owned by the return. This also alleviates
a problem where TCO no longer applies.

R=jarin@chromium.org
TEST=mjsunit/regress/regress-crbug-624747
BUG=chromium:624747

Review-Url: https://codereview.chromium.org/2118793002
Cr-Commit-Position: refs/heads/master@{#37480}

R=jarin@chromium.org
BUG=chromium:625121

Review-Url: https://codereview.chromium.org/2116533004
Cr-Commit-Position: refs/heads/master@{#37479}

R=mstarzinger@chromium.org,bradnelson@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2118733003
Cr-Commit-Position: refs/heads/master@{#37478}

This optimizes the passing of stack parameters in function calls.

For some architectures (ia32/x64), using pushes when possible instead
of bumping the stack and then storing parameters generates much
smaller code, and in some cases is faster (e.g. when a push of a memory
location can implement a memory-to-memory copy and thus elide an
intermediate load. On others (e.g. ARM), the benefit is smaller, where
it's only possible to elide direct stack pointer adjustment in certain cases
or combine multiple register stores into a single instruction in other limited
situations. On yet other platforms (ARM64, MIPS), there are no push instructions,
and this optimization isn't used at all.

Ideally, this mechanism would be used for both tail calls and normal calls,
but "normal" calls are currently pretty efficient, and tail calls are very
inefficient, so this CL sets the bar low for building a new mechanism to
handle parameter pushing that only needs to raise the bar on tail calls for now.

The key aspect of this change is that adjustment to the stack pointer
for tail calls (and perhaps later real calls) is an explicit step separate from
instruction selection and gap resolution, but aware of both, making it possible
to safely recognize gap moves that are actually pushes.

Review-Url: https://codereview.chromium.org/2082263002
Cr-Commit-Position: refs/heads/master@{#37477}

Import fdlibm versions of acos, acosh, asin and asinh, which are more
precise and produce the same result across platforms (we were using
libm versions for asin and acos so far, where both speed and precision
depended on the operating system so far). Introduce appropriate TurboFan
operators for these functions and use them both for inlining and for the
generic builtin.

Also migrate the Math.imul and Math.fround builtins to TurboFan builtins
to ensure that their behavior is always exactly the same as the inlined
TurboFan version (i.e. C++ truncation semantics for double to float
don't necessarily meet the JavaScript semantics).

For completeness, also migrate Math.sign, which can even get some nice
love in TurboFan.

Drive-by-fix: Some alpha-sorting on the Math related functions, and
cleanup the list of Math intrinsics that we have to export via the
native context currently.

BUG=v8:3266,v8:3496,v8:3509,v8:3952,v8:5169,v8:5170,v8:5171,v8:5172
TBR=rossberg@chromium.org
R=franzih@chromium.org

Review-Url: https://codereview.chromium.org/2116753002
Cr-Commit-Position: refs/heads/master@{#37476}

This ensures no eager bailout point is emitted after a comma expression
in test context where the right-hand side omitted an eager bailout point
as well. This is to stay in sync with full-codegen.

R=jarin@chromium.org
TEST=mjsunit/regress/regress-crbug-624919
BUG=chromium:624919

Review-Url: https://codereview.chromium.org/2113893004
Cr-Commit-Position: refs/heads/master@{#37475}

BUG=

Review-Url: https://codereview.chromium.org/2111153002
Cr-Commit-Position: refs/heads/master@{#37474}

Migrate Math.hypot() from JS to C++ builtins. Use normalization and
Kahan summation to avoid overflow and rounding errors.

R=bmeurer@chromium.org
BUG=v8:5165, v8:5086
LOG=n

Review-Url: https://codereview.chromium.org/2102223005
Cr-Commit-Position: refs/heads/master@{#37473}

  Since the workaround (CL 36697 : 22a73e0d) for sNaN issue works, enable those test cases.

BUG=

Review-Url: https://codereview.chromium.org/2114853002
Cr-Commit-Position: refs/heads/master@{#37472}

Both of these were broken in different ways:
* On arm, the loop counter was passed as argc on the stack.
* On arm64, we passed argc + 1 instead of argc.

The result in both cases was an incorrect receiver for the builtin frame
when generating stack traces.

BUG=v8:4815
R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2112883002
Cr-Commit-Position: refs/heads/master@{#37471}

Directs 'use asm' traffic through asm-wasm conversion when --validate-asm is passed.

Adds a builtin that handles the fallback to JS.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
TEST=asm-wasm
R=mstarzinger@chromium.org,titzer@chromium.org
LOG=N

Review-Url: https://codereview.chromium.org/2057403003
Cr-Commit-Position: refs/heads/master@{#37470}

  port 588e15c0 (r37345)

  original commit message:
  The opcodes for 'cmpw r/m16, r16' and 'cmpw r16, r/m16' were swapped, causing a few issues when less than/greater than comparison were performed.

  Adds a regression test.

BUG=

Review-Url: https://codereview.chromium.org/2119793002
Cr-Commit-Position: refs/heads/master@{#37469}

  port e607e12e (r37323)

  original commit message:
  Introduce a new machine operator Float64Pow that for now is backed by
  the existing MathPowStub to start the unification of Math.pow, and at
  the same time address the main performance issue that TurboFan still has
  with the imaging-darkroom benchmark in Kraken.

  Also migrate the Math.pow builtin itself to a TurboFan builtin and
  remove a few hundred lines of hand-written platform code for special
  handling of the fullcodegen Math.pow version.

BUG=

Review-Url: https://codereview.chromium.org/2119773003
Cr-Commit-Position: refs/heads/master@{#37468}

Rolling v8/build to c80c063b314ab9cc6c3c5955c7444c2fa514bcec

Rolling v8/buildtools to 454e53abae6e4d68ee992b0a93a4174b75519393

Rolling v8/tools/mb to ea4154b4daca60a5f5c04ef764b7eaf50362250c

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

Review-Url: https://codereview.chromium.org/2113243002
Cr-Commit-Position: refs/heads/master@{#37467}

  port 5e058540 (r37325)

  original commit message:
  The reason for reverting is: This breaks gc-stress bot:
  https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot

  Abortion of compaction could cause duplicate entries in the typed-old-to-new remembered set. These duplicates could cause a DCHECK to trigger which checks that slots recorded in the remembered set neve

  Original issue's description:

  Cells were needed originally because there was no typed remembered set to
  record direct pointers from code space to new space. A previous
  CL (https://codereview.chromium.org/2003553002/) already introduced
  the remembered set, this CL uses it.

  This CL
  * stores direct pointers in code objects, even if the target is in new space,
  * records the slot of the pointer in typed-old-to-new remembered set,
  * adds a list which stores weak code-to-new-space references,
  * adds a test to test-heap.cc for weak code-to-new-space references,
  * removes prints in tail-call-megatest.js

BUG=

Review-Url: https://codereview.chromium.org/2112193002
Cr-Commit-Position: refs/heads/master@{#37466}

Port cede9ce5

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

BUG=v8:5086
LOG=N

Review-Url: https://codereview.chromium.org/2113193002
Cr-Commit-Position: refs/heads/master@{#37465}

Revert of Add errors for declarations which conflict with catch parameters. (patchset #6 id:100001 of https://codereview.chromium.org/2109733003/ )

Reason for revert:
Fuzzer claims `try {  \"\" ; } catch(x) { let x1 = [1,,], x = x; }` causes a crash.

Original issue's description:
> Add errors for declarations which conflict with catch parameters.
>
> Catch parameters are largely treated as lexical declarations in the
> block which contains their body for the purposes of early syntax errors,
> with some exceptions outlined in B.3.5. This patch introduces most of
> those errors, except those from `eval('for (var e of ...);')` inside of
> a catch with a simple parameter named 'e'.
>
> Note that annex B.3.5 allows var declarations to conflict with simple
> catch parameters, except when the variable declaration is the init of a
> for-of statement.
>
> BUG=v8:5112,v8:4231
>
> Committed: https://crrev.com/2907c726b2bb5cf20b2bec639ca9e6a521585406
> Cr-Commit-Position: refs/heads/master@{#37462}

TBR=littledan@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5112,v8:4231

Review-Url: https://codereview.chromium.org/2112223002
Cr-Commit-Position: refs/heads/master@{#37464}

- Uses byte_width() to determine if spill ranges can be merged.
- Modifies InstructionOperand canonicalization to ignore representation for stack slots.

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2074323002
Cr-Commit-Position: refs/heads/master@{#37463}

Catch parameters are largely treated as lexical declarations in the
block which contains their body for the purposes of early syntax errors,
with some exceptions outlined in B.3.5. This patch introduces most of
those errors, except those from `eval('for (var e of ...);')` inside of
a catch with a simple parameter named 'e'.

Note that annex B.3.5 allows var declarations to conflict with simple
catch parameters, except when the variable declaration is the init of a
for-of statement.

BUG=v8:5112,v8:4231

Review-Url: https://codereview.chromium.org/2109733003
Cr-Commit-Position: refs/heads/master@{#37462}

Port 5febc27b

Original commit message:

    Prior to this commit, calls to C++ builtins created standard exit
    frames, which are skipped when constructing JS stack traces. In order to
    show these calls on traces, we introduce a new builtin exit frame type.

    Builtin exit frames contain target and new.target on the stack and are
    not skipped during stack trace construction.

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

BUG=v8:4815
LOG=N

Review-Url: https://codereview.chromium.org/2105023008
Cr-Commit-Position: refs/heads/master@{#37461}

MathMaxMin creates frame on stack without removing top bit of r14 on 31-bit.

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2111263002
Cr-Commit-Position: refs/heads/master@{#37460}

AddBoundMethod, in i18n.js, returns functions all of which share the
same backing SharedFunctionInfo, which means that its calls to
InstallGetter were causing all such functions to have a single name
(that of the last caller, "get breakType").

This patch skips calling InstallGetter and instead directly calls
%DefineGetterPropertyUnchecked, which itself sets the name property
on the JSFunction instance (it knows how to do this in order to handle
getters that have computed property names).

Also takes care of a TODO having to do with the inner boundMethod:
its name is now made empty, by using a new macro that gets around
ES2015's function name inference.

Finally, removes a redundant %FunctionRemovePrototype: arrow functions
have no prototypes to begin with.

R=littledan@chromium.org
BUG=v8:4778

Review-Url: https://codereview.chromium.org/2109223002
Cr-Commit-Position: refs/heads/master@{#37459}

Reland of Add crash instrumentation for crbug.com/621147 (patchset #1 id:1 of https://codereview.chromium.org/2118493002/ )

Reason for revert:
By request from ishell, plan is to leave this in master for awhile longer

Original issue's description:
> Revert of Add crash instrumentation for crbug.com/621147 (patchset #5 id:80001 of https://codereview.chromium.org/2100313002/ )
>
> Reason for revert:
> Instrumentation not needed on master branch
>
> Original issue's description:
> > Add crash instrumentation for crbug.com/621147
> >
> > BUG=chromium:621147
> > LOG=N
> > R=ishell@chromium.org,cbruni@chromium.org
> >
> > Committed: https://crrev.com/5ff508a82299f20a0d9828cf73072a4f4772fab8
> > Cr-Commit-Position: refs/heads/master@{#37328}
>
> TBR=verwaest@chromium.org,cbruni@chromium.org,ishell@chromium.org,mlippautz@chromium.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=chromium:621147, chromium:624764
>
> Committed: https://crrev.com/b324850900e531ccee03f1712333f13dfcf15427
> Cr-Commit-Position: refs/heads/master@{#37456}

TBR=verwaest@chromium.org,cbruni@chromium.org,ishell@chromium.org,mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:621147, chromium:624764

Review-Url: https://codereview.chromium.org/2114743002
Cr-Commit-Position: refs/heads/master@{#37458}

Added missing GetExtraICState() function for CompareICStub. Without it,
code->extra_ic_state() in IC::StateFromCode was returning zero, which was
causing some performance regressions, as the TypeFeedbackInfo was not updated
correctly, resulting in the runtime profiler choosing not to optimise some
functions that we previously would.

BUG=

Review-Url: https://codereview.chromium.org/2116523002
Cr-Commit-Position: refs/heads/master@{#37457}