The new SourcePosition class allows for precise tracking of source positions including the stack of inlinings. This CL makes the cpu profiler use this new information. Before, the cpu profiler used the deoptimization data to reconstruct the inlining stack. However, optimizing compilers (especially Turbofan) can hoist out checks such that the inlining stack of the deopt reason and the inlining stack of the position the deoptimizer jumps to can be different (the old cpu profiler tests and the ones introduced in this cl produce such situations for turbofan). In this case, relying on the deoptimization info produces paradoxical results, where the reported position is before the function responsible is called. Even worse, https://codereview.chromium.org/2451853002/ combines the precise position with the wrong inlining stack from the deopt info, leading to completely wrong results.

Other changes in this CL:
- DeoptInlinedFrame is no longer needed, because we can compute the correct inlining stack up front.
- I changed the cpu profiler tests back to test situations where deopt checks are hoisted out in Turbofan and made them robust enough to handle the differences between Crankshaft and Turbofan.
- I reversed the order of SourcePosition::InliningStack to make it match the cpu profiler convention.
- I removed CodeDeoptEvent::position, as it is no longer used.

R=alph@chromium.org

BUG=v8:5432

Review-Url: https://codereview.chromium.org/2503393002
Cr-Commit-Position: refs/heads/master@{#41168}

R=hablich@chromium.org
NOTRY=true
NOTREECHECKS=true

Review-Url: https://codereview.chromium.org/2514283003
Cr-Commit-Position: refs/heads/master@{#41167}

TurboFan can indeed comsume NumberOrOddball feedback for abstract
relational comparisons, so we should just provide it from Ignition.

Drive-by-fix: Add a DCHECK to protect against abstract/strict equality
number comparison accidentially utilizing Oddball feedback.

BUG=v8:5267,v8:5400
R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2518283002
Cr-Commit-Position: refs/heads/master@{#41166}

This code should not access bytes out of the permitted range in order to check
the range of a possible UTF-8 value. Instead, the length check should occur
before such checks.

BUG=chromium:667260, chromium:662822

Review-Url: https://codereview.chromium.org/2520053003
Cr-Commit-Position: refs/heads/master@{#41165}

R=jshin@chromium.org

Review-Url: https://codereview.chromium.org/2514333002
Cr-Commit-Position: refs/heads/master@{#41164}

Make use of the previously introduced String feedback for compare
operations in TurboFan.

R=jarin@chromium.org
BUG=v8:5267,v8:5400

Review-Url: https://codereview.chromium.org/2523463002
Cr-Commit-Position: refs/heads/master@{#41163}

BUG=none
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2505823002
Cr-Commit-Position: refs/heads/master@{#41162}

BUG=chromium:651324

Review-Url: https://codereview.chromium.org/2522593005
Cr-Commit-Position: refs/heads/master@{#41161}

 - Simd Scalar lowering should be conditionally disabled if the architecture has a native SIMD implementation.
 - Enable scalar lowering tests on all architectures instead of only x64.

R=bbudge@chromium.org, aseemgarg@chromium.org

Review-Url: https://codereview.chromium.org/2514663002
Cr-Commit-Position: refs/heads/master@{#41160}

The verifier needs to use the block and assessments in that block corresponding to
a predecessor of a "pending" assessment. Not doing that causes incorrect
assessments when 2 locations are swapped.

BUG=665402

Review-Url: https://codereview.chromium.org/2515803002
Cr-Commit-Position: refs/heads/master@{#41159}

This fixes a bug found by the fuzzer where we would attempt to
dereference a null handle if memory allocation failed. In this case,
the failure was because the amount of memory requested was above V8's
hardcoded limit.

BUG= https://bugs.chromium.org/p/chromium/issues/detail?id=666741

Review-Url: https://codereview.chromium.org/2514983002
Cr-Commit-Position: refs/heads/master@{#41158}

Export JS_API_OBJECT_TYPE, JS_SPECIAL_API_OBJECT_TYPE.

Exports JSObject::kHeaderSize to ease the inspection of internal fields
in llnode.

BUG=
R=machenbach

Review-Url: https://codereview.chromium.org/2514063002
Cr-Commit-Position: refs/heads/master@{#41157}

Instead of directly using v8_enable_inspector_override from
build_overrides/v8.gni in all the GN configs, set a v8_enable_inspector
variable based on v8_enable_inspector_override and use that everywhere.
This is the more common pattern seen in over projects, and reduces the
need to include //build_overrides/v8.gni in many files.

Review-Url: https://codereview.chromium.org/2520683002
Cr-Commit-Position: refs/heads/master@{#41156}

R=titzer@chromium.org
CC=mtrofin@chromium.org

Review-Url: https://codereview.chromium.org/2520853003
Cr-Commit-Position: refs/heads/master@{#41155}

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

Review-Url: https://codereview.chromium.org/2520963002
Cr-Commit-Position: refs/heads/master@{#41154}

This pre-calculates and stores a vector of bytecode offsets, and then allows
one to iterate over it backwards. This could probably be adapted to a
bidirectional/random access iterator if we wanted to, but for now reverse
is all we need.

Review-Url: https://codereview.chromium.org/2518003002
Cr-Commit-Position: refs/heads/master@{#41153}

Refactors the bytecode array iterator to separate the iteration and the
bytecode parameter access, placing the latter into a separate
super-class. This will allow us to have other forms of access, e.g.
reverse iteration.

Review-Url: https://codereview.chromium.org/2519923002
Cr-Commit-Position: refs/heads/master@{#41152}

BUG=v8:5296

Review-Url: https://codereview.chromium.org/2320753002
Cr-Commit-Position: refs/heads/master@{#41151}

Revert of [counters] RuntimeStats: fix wrong bookkeeping when dynamically changing counters. (patchset #10 id:180001 of https://codereview.chromium.org/2511093002/ )

Reason for revert:
Wronged it even more.

Original issue's description:
> [counters] RuntimeStats: fix wrong bookkeeping when dynamically changing counters
>
> RuntimeTimerScopes always subtract their own time from the parent timer's
> counter to properly account for the own time. Once a scope is destructed it
> adds it own timer to the current active counter. However, if the current
> counter is changed with CorrectCurrentCounterId we will attribute all the
> subtimers to the previous counter, and add the own time to the new counter.
> This way it is possible to end up with negative times in certain counters but
> the overall would still be correct.
>
> BUG=
>
> Committed: https://crrev.com/f6c74d964d9387df4bed3d8c1ded51eb9e8aa6e8
> Cr-Commit-Position: refs/heads/master@{#41142}

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

Review-Url: https://codereview.chromium.org/2519073002
Cr-Commit-Position: refs/heads/master@{#41150}

R=jgruber@chromium.org
BUG=v8:5530

Review-Url: https://codereview.chromium.org/2516343003
Cr-Commit-Position: refs/heads/master@{#41149}

This is unused.

BUG=v8:5343
TBR=littledan@chromium.org

Review-Url: https://codereview.chromium.org/2513413002
Cr-Commit-Position: refs/heads/master@{#41148}

[parser] Keep track of whether we are in a temp-zone in the parser, and don't lazy parse anymore once we are

This avoids entering a nested temp zone, and fixes up tracing and runtime callstats names.

BUG=

Review-Url: https://codereview.chromium.org/2514353002
Cr-Commit-Position: refs/heads/master@{#41147}

This test tests a code path that's being deprecated. There is no point
in migrating it to the new debugger API.

R=jgruber@chromium.org
BUG=v8:5530

Review-Url: https://codereview.chromium.org/2519033002
Cr-Commit-Position: refs/heads/master@{#41146}

BUG=

Review-Url: https://codereview.chromium.org/2517993002
Cr-Commit-Position: refs/heads/master@{#41145}

By now the compilation pipeline is flexible enough to run module tests
against all variants, we should no longer choose unsupported compilers
for modules. It also fixes the predicate checking for functions being
"resumable" in the {AstNumberingVisitor} heuristic.

R=neis@chromium.org
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2517143002
Cr-Commit-Position: refs/heads/master@{#41144}

Add/Shl to Lsa optimization doesn't yield any performance increase in case
one of the operand is immediate, because Lsa cannot use the immediate so
we use an extra instruction to load the immediate to register. On MIPSR2 and
less this optimization leads to performance degradation, since Lsa is not
supported on these architectures and it is emulated using Add/Shl which
do support immediate as operand for Add.

BUG=

Review-Url: https://codereview.chromium.org/2509203003
Cr-Commit-Position: refs/heads/master@{#41143}

RuntimeTimerScopes always subtract their own time from the parent timer's
counter to properly account for the own time. Once a scope is destructed it
adds it own timer to the current active counter. However, if the current
counter is changed with CorrectCurrentCounterId we will attribute all the
subtimers to the previous counter, and add the own time to the new counter.
This way it is possible to end up with negative times in certain counters but
the overall would still be correct.

BUG=

Review-Url: https://codereview.chromium.org/2511093002
Cr-Commit-Position: refs/heads/master@{#41142}

Revert of [turbofan] Introduce LoadFunctionPrototype simplified operator. (patchset #1 id:1 of https://codereview.chromium.org/2517913002/ )

Reason for revert:
Blocks roll https://codereview.chromium.org/2517963002/

Original issue's description:
> [turbofan] Introduce LoadFunctionPrototype simplified operator.
>
> Add a LoadFunctionPrototype simplified operator, similar to what
> Crankshaft has, that loads the prototype property of a constructor
> function.
>
> R=jarin@chromium.org
> BUG=v8:5267
>
> Committed: https://crrev.com/1737b2c74b50168e96ef1263def0eb43505fa80c
> Cr-Commit-Position: refs/heads/master@{#41127}

TBR=jarin@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2514363002
Cr-Commit-Position: refs/heads/master@{#41141}

This renames the {operand_stack} field to {register_file}, to refelct
how said field is used on all {JSGeneratorObject} instances by now. This
is a pure refactoring CL, not changes in semantics.

R=neis@chromium.org

Review-Url: https://codereview.chromium.org/2520913002
Cr-Commit-Position: refs/heads/master@{#41140}

R=jgruber@chromium.org
BUG=v8:5654

Review-Url: https://codereview.chromium.org/2511733002
Cr-Commit-Position: refs/heads/master@{#41139}

BUG=chromium:655129

Review-Url: https://codereview.chromium.org/2520903002
Cr-Commit-Position: refs/heads/master@{#41138}

This removes some outdated code that allocates a {JSGeneratorObject} for
baseline code. We no longer support such a representation of generators
and can rely on bytecode being available for all generators.

R=neis@chromium.org

Review-Url: https://codereview.chromium.org/2515253003
Cr-Commit-Position: refs/heads/master@{#41137}

BUG=chromium:666742, v8:5561

Review-Url: https://codereview.chromium.org/2512183002
Cr-Commit-Position: refs/heads/master@{#41136}

This removes the deprecated generator support for resumable functions
from {FullCodeGenerator}. The existing {AstNumbering} heuristic already
triggers Ignition for most resumable functions, with this change we make
said heuristic a hard choice and remove the deprecated code. This also
has the advantage that any suspended {JSGeneratorObject} instance on the
heap is guaranteed to have code based on a bytecode array.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2504223002
Cr-Commit-Position: refs/heads/master@{#41135}

Revert of [Interpreter] Collect NumberOrOddball feedback in CompareOps. (patchset #2 id:20001 of https://codereview.chromium.org/2506283003/ )

Reason for revert:
Turbofan doesn't do proper ToNumber conversions on NumberOrOddball equality conversions.

BUG=v8:5660

Original issue's description:
> [Interpreter] Collect NumberOrOddball feedback in CompareOps.
>
> Collect feedback for oddballs in the interpreter compare operations handlers.
> This is important to ensure that we don't consider oddball comparisons as
> generic, which prevents optimization.
>
> BUG=chromium:660947
>
> Committed: https://crrev.com/721e74d9d942fd4f2e3392ea9626d9d404dbbbd0
> Cr-Commit-Position: refs/heads/master@{#41081}

TBR=bmeurer@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:660947

Review-Url: https://codereview.chromium.org/2517133002
Cr-Commit-Position: refs/heads/master@{#41134}

BUG=chromium:664974, chromium:664802, v8:5561

Review-Url: https://codereview.chromium.org/2513893003
Cr-Commit-Position: refs/heads/master@{#41133}

Stepping in a generator now behaves similar to stepping inside an
async function. Stepping in or next at a yield expression will result in
a break inside the same generator when we return to the generator.
Behavior of step-out does not change.

R=jgruber@chromium.org, neis@chromium.org
BUG=chromium:496865

Review-Url: https://codereview.chromium.org/2519853002
Cr-Commit-Position: refs/heads/master@{#41132}

  The reason:
  The CL #40862 (https://codereview.chromium.org/2433093002 ) caused 2 test cases failed for X87.
  Because Both 2 test cases (MoveOptimizerTest.RemovesRedundantExplicit and RegisterAllocatorTest.CanAllocateFPRegisters)
  needs 2 allocatable Float/Double registers.
  But there's only 1 allocatable Float/Double register in x87 turbofan compiler, i.e.: register index 0.

  This CL disables MoveOptimizerTest.RemovesRedundantExplicit and RegisterAllocatorTest.CanAllocateFPRegisters test cases for x87.

BUG=

Review-Url: https://codereview.chromium.org/2520623005
Cr-Commit-Position: refs/heads/master@{#41131}

BUG=chromium:576312, v8:5561

Review-Url: https://codereview.chromium.org/2515233002
Cr-Commit-Position: refs/heads/master@{#41130}

Adapted various tests to restrictions of inspector protocol:

* osr-typing-debug-change: Don't set function variable value.
* debug-evaluate-locals: Add variable introduced by eval, run typeof
  inside evaluate().
* regress-419663: Don't set duplicate breakpoints.
* regress-crbug-465298: Compare against function name instead of value.
* regress-crbug-621361: Make evaluate return string results.
* debug-script: Various counts were off due to new way tests are called.
                Added new inspector script type.

Breakpoints now contain the actual break position, and remote object
reconstruction has been extended a bit.

BUG=v8:5530

Review-Url: https://codereview.chromium.org/2505363002
Cr-Commit-Position: refs/heads/master@{#41129}