Get rid of further typing checks from ChangeLowering and put them into
the representation selection pass instead (encoding the information in
the operator instead).

Drive-by-change: Rename ChangeSmiToInt32 to ChangeTaggedSignedToInt32
for consistency about naming Tagged, TaggedSigned and TaggedPointer.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1909343002

Cr-Commit-Position: refs/heads/master@{#35723}

Currently we are using UnsafeCurrent in async signal handler to acquire the
isolate of VM thread, but we want to get rid of that since it prevents V8 from
being thread agnostic.

This patch replaces UnsafeCurrent with a static map, where we store a map of
samplers for threads, and makes it accessible by signal handler.

BUG=v8:4889
LOG=n

Review URL: https://codereview.chromium.org/1900473002

Cr-Commit-Position: refs/heads/master@{#35722}

Some scopes are introduced by the parser for desugaring and do not
have any positions associated. The debugger should not make them
visible.

Also add some missing source positions.

R=kozyatinskiy@chromium.org, rossberg@chromium.org
BUG=chromium:604458
LOG=Y

Review URL: https://codereview.chromium.org/1901413002

Cr-Commit-Position: refs/heads/master@{#35721}

Adds IncStub and DecStub TurboFan code stubs and hooks them up to the
interpreter's Inc and Dec bytecodes (which are used for count
operations, e.g. i++).

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1901083002

Cr-Commit-Position: refs/heads/master@{#35720}

Fixes a mistake made in r35618 for register OperandSize calculations.

BUG=605470
LOG=N

Review URL: https://codereview.chromium.org/1908033002

Cr-Commit-Position: refs/heads/master@{#35719}

BUG=chromium:605516
LOG=n

Review URL: https://codereview.chromium.org/1913013003

Cr-Commit-Position: refs/heads/master@{#35718}

BUG=chromium:605349
LOG=NO

Review URL: https://codereview.chromium.org/1912923003

Cr-Commit-Position: refs/heads/master@{#35717}

The new bytecodes replace two runtime functions. They are still unsupported by the bytecode graphbuilder, though.

BUG=v8:4907
LOG=n

Review URL: https://codereview.chromium.org/1904933002

Cr-Commit-Position: refs/heads/master@{#35716}

This is a follow-up to 58429beb
"Fix KeyedStore stub selection for STRING_WRAPPER_ELEMENTS".

BUG=chromium:602184
LOG=n

Review URL: https://codereview.chromium.org/1912443004

Cr-Commit-Position: refs/heads/master@{#35715}

The feature was deprecated in M49 and flagged off in M50.
This patch removes it entirely from the codebase.

Review URL: https://codereview.chromium.org/1909433003

Cr-Commit-Position: refs/heads/master@{#35714}

If we have to convert a float64 value to tagged representation and we
already know that the value is either in Signed31/Signed32 or
Unsigned32 range, then we can just convert the float64 to word32 and
use the fast word32 to tagged conversion. Doing this in
ChangeLowering (or the effect linearization pass) would be unsound, as
the types on the nodes are no longer usable.

This removes all Type uses from effect linearization. There's still some
work to be done for ChangeLowering tho.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1908093002

Cr-Commit-Position: refs/heads/master@{#35713}

This is pretty useful when debugging. There is no easy way to find the
bytecode arrays on the stack.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1909663005

Cr-Commit-Position: refs/heads/master@{#35712}

GetInstructionBlock shows up in some compile time-intensive profiles.
Changing it to a O(1) operation. The compile benchmark confirms the
improvement.

BUG=

Review URL: https://codereview.chromium.org/1896813003

Cr-Commit-Position: refs/heads/master@{#35711}

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1908503003

Cr-Commit-Position: refs/heads/master@{#35710}

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1897213003

Cr-Commit-Position: refs/heads/master@{#35709}

This patch introduces new scopes in the preparser, just like they
are introduced by the parser, in the following places:

-   blocks
-   try statement
-   switch statement
-   scoped statements, in several places
-   for statement
-   eager function bodies

R=rossberg@chromium.org
BUG=
LOG=N

Review URL: https://codereview.chromium.org/1906793002

Cr-Commit-Position: refs/heads/master@{#35708}

This way the first scheduler can properly wire them to the effect chain,
as otherwise the second scheduler could schedule them such that they
would be able to read uninitialized memory (once we drop the region
protection in the first scheduler).

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1908963002

Cr-Commit-Position: refs/heads/master@{#35707}

Non-vectorized KeyedLoadICs used to remember whether they had seen Names
as keys; Crankshaft uses this information to avoid emitting elements
accesses which would always deopt. This CL restores that functionality
for vector ICs.

BUG=chromium:594183
LOG=y
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1912593002

Cr-Commit-Position: refs/heads/master@{#35706}

This removes the CompilationInfo argument from one of the logging
functions where it is unused. The long-term goal is to not pass around
the CompilationInfo at all. The assumption that the CompilationInfo is
available is incompatible with serialized code, where compilation has
happened during building time of V8 itself.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1901353003

Cr-Commit-Position: refs/heads/master@{#35705}

BUG=v8:4690
LOG=N

Review URL: https://codereview.chromium.org/1907973002

Cr-Commit-Position: refs/heads/master@{#35704}

Fix for execution tests on simulator.
Port 3518e492

Original commit message:
    Short external strings do not cache the resource data, and may be used
    for compressible strings. The assumptions about their lengths is
    invalid and may lead to oob reads.

BUG=

Review URL: https://codereview.chromium.org/1904033003

Cr-Commit-Position: refs/heads/master@{#35703}

The JavaScript pipeline now consists of the following steps:

 1. Typed lowering.
 2. Representation selection (actually SimplifiedLowering).
 3. Early optimization pass (incl. JSGenericLowering).
 4. Effect control linearization (not for asm.js).
 5. Late optimization pass (incl. ChangeLowering).
 6. Real scheduling.

We should further cleanup the passes and restrict type and
representation information usage to appropriate parts of the pipeline.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1907963002

Cr-Commit-Position: refs/heads/master@{#35702}

R=vogelheim@chromium.org
BUG=v8:4690
LOG=N

Review URL: https://codereview.chromium.org/1910813002

Cr-Commit-Position: refs/heads/master@{#35701}

This operator doesn't generate any actual code, but teaches the register
allocator that a certain computed pointer value is tagged. This is
required to safely implement InnerAllocate (and we also use this for
Allocate to be sure that we don't suddenly leak a dangling pointer into
the heap somewhere).

R=epertoso@chromium.org
BUG=v8:4939
LOG=n

Review URL: https://codereview.chromium.org/1905813003

Cr-Commit-Position: refs/heads/master@{#35700}

BUG=

Review URL: https://codereview.chromium.org/1912553002

Cr-Commit-Position: refs/heads/master@{#35699}

R=jfb@chromium.org,rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1900153002

Cr-Commit-Position: refs/heads/master@{#35698}

BUG=chromium:605060
LOG=n

Review URL: https://codereview.chromium.org/1907953002

Cr-Commit-Position: refs/heads/master@{#35697}

Adds a Generate method to the stubs that can be used to embed the graph directly in the bytecode handlers.

Review URL: https://codereview.chromium.org/1902823002

Cr-Commit-Position: refs/heads/master@{#35696}

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

Review URL: https://codereview.chromium.org/1909513002

Cr-Commit-Position: refs/heads/master@{#35695}

This check whether a function is being debugged is obsolete. For the
optimization path it is covered by a bailout further down. The lookup
within the optimized code map doesn't need to be covered, because that
map is guaranteed to stay empty while break slots are present.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1907923003

Cr-Commit-Position: refs/heads/master@{#35694}

[deoptimizer] Do not modify stack_fp which is used as a key for lookup of previously materialized objects.

BUG=chromium:604680, v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1904663003

Cr-Commit-Position: refs/heads/master@{#35693}

BUG=v8:4933
R=verwaest@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1899283003

Cr-Commit-Position: refs/heads/master@{#35692}

Since traps now throw real Error objects, we get stack traces
containing <WASM> functions on top-level. The additional tests check
for two traps: unreachable and memory out-of-bounds.

R=ahaas@chromium.org, jfb@chromium.org, titzer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1878563003

Cr-Commit-Position: refs/heads/master@{#35691}

Rolling v8/buildtools to e84114dbe2b65428951c876349b6a3ff1afbfccd

Rolling v8/tools/clang to 2956eca572ff0e1b181df65f71a045f061a2eb34

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

Review URL: https://codereview.chromium.org/1909483004

Cr-Commit-Position: refs/heads/master@{#35690}

  The CL #35651 (https://codereview.chromium.org/1858323003) exposed one hiden issue in RunTruncateFloat32ToUint32 test cases and X87 failed at it.

  Here is the issue in RunTruncateFloat32ToUint32:
  For float input = static_cast<float>(*i), the x87 GCC would optimize the input viariable in float floating register for release build.

  The problem is:
  SSE float register has single precision rounding semantic While X87 register hasn't when directly use floating register value. It will cause the value of input viariable has
  different precision for IA32 and X87 port. So static_cast<uint32_t>(input) will be different for IA32 and X87 port too.
  This led to CHECK_EQ(static_cast<uint32_t>(input), m.Call(input)) fail although V8 turbofan JITTed code m.Call(input) has exactly same result in both X87 and IA32 port.

  So we add the following sentence to do type cast to keep the single precision for RunTruncateFloat32ToUint32 by forcing the input viariable get value from memory insread of
  floating register.
  Such as: volatile float input = static_cast<float>(*i).

BUG=

Review URL: https://codereview.chromium.org/1905883002

Cr-Commit-Position: refs/heads/master@{#35689}

BUG=v8:4928
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1903043006

Cr-Commit-Position: refs/heads/master@{#35688}

This extends the wasm test case which only checks the "simple"
string-variant of the stack trace.
It checks the return values of the getFunctionName, getLineNumber,
getFileName and toString methods.

R=machenbach@chromium.org, jfb@chromium.org, titzer@chromium.org

Review URL: https://codereview.chromium.org/1875153002

Cr-Commit-Position: refs/heads/master@{#35687}

The external snapshot target is missing a few build
dependencies.

TBR=vogelheim@chromium.org, yangguo@chromium.org, clemensh@chromium.org

Review URL: https://codereview.chromium.org/1904013002

Cr-Commit-Position: refs/heads/master@{#35686}

This patch provides a new implementation of popcnt and ctz in the case
where the platform does not provide these instructions. Instead of
building a TF graph which implements it we now call a C function.

Additionally I turned on additional tests in test-run-wasm-64.cc

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1857363003

Cr-Commit-Position: refs/heads/master@{#35685}

Move allocation-related and smi un/tagging methods into CodeStubAssembler.

Review URL: https://codereview.chromium.org/1893383002

Cr-Commit-Position: refs/heads/master@{#35684}