The current context is stored as a stack slot on the interpreter frame
and therefore we don't need to also maintain a machine register for the
context. Removes this register from bytecode handlers.

In the process modifies this frees up a register on ia32 to keep the
dispatch table pointer in a register rather than on a stack slot on
ia32.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1887493004

Cr-Commit-Position: refs/heads/master@{#35511}

Modifies Ignition to store code entry addresses in the dispatch table
rather than code objects. This allows the interpreter to avoid
calculating the code entry address from the code object on every
dispatch and provides a ~5-7% performance improvement on Octane with
Ignition.

This change adds ArchOpcode::kArchTailCallAddress to TurboFan to enable
tail call dispatch using these code addresses. It also adds a Dispatch
linkage creator (distinct from the stub linkage type used previously) to
allow targetting a code address target (which will diverge further from
the stub linkage type when we remove the context machine register in
Ignition).

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1882073002

Cr-Commit-Position: refs/heads/master@{#35480}

Reland of (https://codereview.chromium.org/1617503003)

* New atomic code stubs for x64, ia32, arm, arm64
* Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue
  to macro-assembler-ia32 (API based on x64 macro assembler)
* Remove runtime implementation of Atomics.load, the code stub should always be
  called instead
* Add new test to mjsunit atomics test; check that Smi values of different
  sizes are supported when possible, else fall back to HeapNumbers

These changes were needed to add another codestub:
* Bump kStubMajorKeyBits from 7 to 8
* Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12

BUG=v8:4614
LOG=y
TBR=jarin@chromium.org,bmeurer@chromium.org,rodolph.perfetta@gmail.com,machenbach@chromium.org

Review URL: https://codereview.chromium.org/1617503003

Cr-Commit-Position: refs/heads/master@{#35427}

Review URL: https://codereview.chromium.org/1881383003

Cr-Commit-Position: refs/heads/master@{#35453}

Revert of [Atomics] code stubs for atomic operations (patchset #28 id:530001 of https://codereview.chromium.org/1617503003/ )

Reason for revert:
[Sheriff] Roll was reverted. Please fix unused methods, see:
https://codereview.chromium.org/1884913002/

https://build.chromium.org/p/tryserver.chromium.win/builders/win_clang/builds/5585/steps/compile%20%28with%20patch%29/logs/stdio

Original issue's description:
> [Atomics] code stubs for atomic operations
>
> * New atomic code stubs for x64, ia32, arm, arm64
> * Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue
>   to macro-assembler-ia32 (API based on x64 macro assembler)
> * Remove runtime implementation of Atomics.load, the code stub should always be
>   called instead
> * Add new test to mjsunit atomics test; check that Smi values of different
>   sizes are supported when possible, else fall back to HeapNumbers
>
> These changes were needed to add another codestub:
> * Bump kStubMajorKeyBits from 7 to 8
> * Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12
>
> BUG=v8:4614
> LOG=y
>
> Committed: https://crrev.com/10b5febe11b318cfef130abae343183ac862e60d
> Cr-Commit-Position: refs/heads/master@{#35427}

TBR=jarin@chromium.org,bmeurer@chromium.org,rodolph.perfetta@gmail.com,binji@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4614

Review URL: https://codereview.chromium.org/1884883003

Cr-Commit-Position: refs/heads/master@{#35443}

Visit the Optimized Code Map on first call rather than closure creation.

This is useful for escape analysis, and helps upcoming changes to
type feedback gathering.

Adding notry due to crashed builders:
NOTRY=true
BUG=

Committed: https://crrev.com/9336f4cc6d25d39a128176679a70dbd13a6d946e
Cr-Commit-Position: refs/heads/master@{#35395}

Review URL: https://codereview.chromium.org/1670143002

Cr-Commit-Position: refs/heads/master@{#35440}

* New atomic code stubs for x64, ia32, arm, arm64
* Add convenience functions JumpIfNotValidSmiValue, JumpIfUintNotValidSmiValue
  to macro-assembler-ia32 (API based on x64 macro assembler)
* Remove runtime implementation of Atomics.load, the code stub should always be
  called instead
* Add new test to mjsunit atomics test; check that Smi values of different
  sizes are supported when possible, else fall back to HeapNumbers

These changes were needed to add another codestub:
* Bump kStubMajorKeyBits from 7 to 8
* Reduce ScriptContextFieldStub::kSlotIndexBits from 13 to 12

BUG=v8:4614
LOG=y

Review URL: https://codereview.chromium.org/1617503003

Cr-Commit-Position: refs/heads/master@{#35427}

Previously TurboFan always went to the runtime to allocate in old space,
which is pretty slow compare to a stub call.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1877323002

Cr-Commit-Position: refs/heads/master@{#35418}

Revert of Visit the Optimized Code Map on first call rather than closure creation. (patchset #7 id:120001 of https://codereview.chromium.org/1670143002/ )

Reason for revert:
Blocks roll. See https://codereview.chromium.org/1877003002/ for detailed messages.

You should be able to repro this with Linux ASAN.

Original issue's description:
> Visit the Optimized Code Map on first call rather than closure creation.
>
> This is useful for escape analysis, and helps upcoming changes to
> type feedback gathering.
>
> BUG=
>
> Committed: https://crrev.com/9336f4cc6d25d39a128176679a70dbd13a6d946e
> Cr-Commit-Position: refs/heads/master@{#35395}

TBR=mstarzinger@chromium.org,bmeurer@chromium.org,mvstanton@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/1878063004

Cr-Commit-Position: refs/heads/master@{#35404}

This is useful for escape analysis, and helps upcoming changes to
type feedback gathering.

BUG=

Review URL: https://codereview.chromium.org/1670143002

Cr-Commit-Position: refs/heads/master@{#35395}

... instead of doing stack magic.  This is a cleanup in preparation for the new
generators implementation.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1867263002

Cr-Commit-Position: refs/heads/master@{#35370}

Implementation of turbofan operators Word32PairShl, Word32PairShr,
Word32PairSar, Int32AddPair and Int32SubPair for MIPS.

Port of:
https://codereview.chromium.org/1765973002/
https://codereview.chromium.org/1778893004/
https://codereview.chromium.org/1778493004/
https://codereview.chromium.org/1778893005/
https://codereview.chromium.org/1842013002/

Added tests for Word32PairShr and Word32PairSar in test-run-machops.cc.

BUG=

Review URL: https://codereview.chromium.org/1819383002

Cr-Commit-Position: refs/heads/master@{#35307}

The previous code cache system required stubs to be marked with a StubType, causing them to be inserted either into a fixed array or into a dictionary-mode code cache. This could cause names to be in both cases, and lookup would just find the "fast" one first. Given that we clear out the caches on each GC, the memory overhead shouldn't be too bad. Additionally, the dictionary itself should just stay linear for small arrays; that's faster anyway.

This CL additionally deletes some dead IC code.

BUG=

Review URL: https://codereview.chromium.org/1846963002

Cr-Commit-Position: refs/heads/master@{#35291}

Introduce a ResumeGeneratorTrampoline, which does the actual stack state
reconstruction (currently always restores a fullcodegen frame), and
introduce appropriate TurboFan builtins for %GeneratorPrototype%.next,
%GeneratorPrototype%.return and %GeneratorPrototype%.throw based on
this native builtin.

Also unify the flooding in case of step-in to always work based on
JSFunction and remove the special casing for JSGeneratorObject.

R=mstarzinger@chromium.org, neis@chromium.org
TBR=rossberg@chromium.org
BUG=chromium:513471
LOG=n

Review URL: https://codereview.chromium.org/1865833002

Cr-Commit-Position: refs/heads/master@{#35283}

Port 40bdbef9

Implement Int32MulPair operator for MIPS.

BUG=

Review URL: https://codereview.chromium.org/1848253002

Cr-Commit-Position: refs/heads/master@{#35256}

R=ishell@chromium.org
BUG=v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1847373002

Cr-Commit-Position: refs/heads/master@{#35230}

This reduces the reserved virtual memory size needed for the store buffer.

BUG=chromium:578883
LOG=NO

Review URL: https://codereview.chromium.org/1851473002

Cr-Commit-Position: refs/heads/master@{#35174}

Replace the uses with proper page flag lookups.

BUG=chromium:581412
LOG=N
TEST=mjsunit/allocation-site-info

Review URL: https://codereview.chromium.org/1845463003

Cr-Commit-Position: refs/heads/master@{#35153}

We now have everything in place to fully implement ToLengthStub as
TurboFanCodeStub without any runtime fallback (modulo allocation failure
of course).

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1843933002

Cr-Commit-Position: refs/heads/master@{#35137}

Port d4a391bb

Add SmiTag()/smiUntag() calls to make values on stack GC-safe.

Original commit message:
Use macro instructions for min, max ops to get the same functionality on
pre-r6 and r6 targets.

BUG=chromium:598651
LOG=N

Review URL: https://codereview.chromium.org/1842833002

Cr-Commit-Position: refs/heads/master@{#35130}

[es6] Add a flag to the Isolate that defines whether ES2015 tail call elimination is enabled or not.

Thus DevTools will be able to disable tail call elimination dynamically upon user's choice.

BUG=v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1837513002

Cr-Commit-Position: refs/heads/master@{#35098}

Use macro instructions for min, max ops to get the same functionality on
pre-r6 and r6 targets.

BUG=
TEST=mjsunit/math-min-max, cctest/test-macro-assembler-mips64/min_max_nan, cctest/test-macro-assembler-mips/min_max_nan, cctest/test-assembler-mips64/min_max, cctest/test-assembler-mips/min_max

Review URL: https://codereview.chromium.org/1694833002

Cr-Commit-Position: refs/heads/master@{#35073}

This is another set of changes that replace JR and JALR instructions
with JIC and JIALC for mips32r6. Macroassembler Jump and Call functions
now use JIC and JIALC if branch delay slot is not used. Code patching is
adjusted to work with new changes and few minor fixes are added.

BUG=

Review URL: https://codereview.chromium.org/1807263003

Cr-Commit-Position: refs/heads/master@{#35071}

This roughly doubles performance for generic Array.prototype.push.

BUG=

Review URL: https://codereview.chromium.org/1816553002

Cr-Commit-Position: refs/heads/master@{#34987}

BUG=v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1819073003

Cr-Commit-Position: refs/heads/master@{#34986}

BUG=

Review URL: https://codereview.chromium.org/1824893002

Cr-Commit-Position: refs/heads/master@{#34973}

Now implemented as a builtin that delegates to the InstanceOfStub. That
stub was parameterized to fallback to either Runtime_InstanceOf or to
Runtime_OrdinaryHasInstance depending on the --harmony-instanceof flag.
Once the feature stabilizes and the flag is no longer needed, we can get
rid of this parameterization again.

R=bmeurer@chromium.org
BUG=v8:4447
LOG=n

Review URL: https://codereview.chromium.org/1819813002

Cr-Commit-Position: refs/heads/master@{#34959}

LOG=N
BUG=v8:4124

Review URL: https://codereview.chromium.org/1706053002

Cr-Commit-Position: refs/heads/master@{#34951}

BUG=

Review URL: https://codereview.chromium.org/1820843002

Cr-Commit-Position: refs/heads/master@{#34937}

Split ToNumberStub into the entry ToNumberStub, and two new stubs,
StringToNumberStub and NonNumberToNumberStub, which can be used when we
already know something about the input (i.e. in various branches of the
code stubs, or in TurboFan graphs).

Also introduce an appropriate StringToNumber simplified operator for
TurboFan, that is pure and is lowered to an invocation of the newly
added StringToNumberStub.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1818923002

Cr-Commit-Position: refs/heads/master@{#34922}

Up until now all type conversions (i.e. ToNumber, ToString and friends)
had their own specific call interface descriptors, where some of them
had to match (i.e. ToString and NumberToString have to use the same
argument register). Instead of all the different descriptors, it's
sufficient to have a single TypeConversionDescriptor instead.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1823523002

Cr-Commit-Position: refs/heads/master@{#34916}

Repair this to match what the runtime correctly does, by first checking if the
function is a constructor before we access the prototype.

R=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1810953002

Cr-Commit-Position: refs/heads/master@{#34863}

 - New RelocInfo mode WASM_MEMORY_REFERENCE as a marker for wasm code objects that need to be relocated on a heap change
 - RelocInfo mode recorded for immediates that use the memory buffer as base
 - Tests to verify address patching works

BUG=

Committed: https://crrev.com/cc815b69c17da368107ed77306a5bb161170c834
Cr-Commit-Position: refs/heads/master@{#34831}

Review URL: https://codereview.chromium.org/1759873002

Cr-Commit-Position: refs/heads/master@{#34836}

Revert of Assembler changes for enabling GrowHeap in Wasm (patchset #13 id:260001 of https://codereview.chromium.org/1759873002/ )

Reason for revert:
Breaks compile:
https://build.chromium.org/p/client.v8/builders/V8%20Mac64/builds/7740

Probably had outdated tryjobs

Original issue's description:
> Assembler changes for enabling GrowHeap in Wasm
>  - New RelocInfo mode WASM_MEMORY_REFERENCE as a marker for wasm code objects that need to be relocated on a heap change
>  - RelocInfo mode recorded for immediates that use the memory buffer as base
>  - Tests to verify address patching works
>
> BUG=
>
> Committed: https://crrev.com/cc815b69c17da368107ed77306a5bb161170c834
> Cr-Commit-Position: refs/heads/master@{#34831}

TBR=titzer@chromium.org,yangguo@chromium.org,bradnelson@chromium.org,bradnelson@google.com,marija.antic@imgtec.com,gdeepti@google.com
# 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/1808823002

Cr-Commit-Position: refs/heads/master@{#34832}

 - New RelocInfo mode WASM_MEMORY_REFERENCE as a marker for wasm code objects that need to be relocated on a heap change
 - RelocInfo mode recorded for immediates that use the memory buffer as base
 - Tests to verify address patching works

BUG=

Review URL: https://codereview.chromium.org/1759873002

Cr-Commit-Position: refs/heads/master@{#34831}

Various failures for MIPS were introduced by the refactoring of
the way frames are marked https://codereview.chromium.org/1696043002.

Problems were caused during context loading in CheckAccessGlobalProxy
* The value of the register at was unintentionally modified.
* Use of branch instruction instead of branch macro resulted in
  a branch instruction in forbidden slot.

BUG=

Review URL: https://codereview.chromium.org/1812463002

Cr-Commit-Position: refs/heads/master@{#34829}

Port 21b331e3

BUG=

Review URL: https://codereview.chromium.org/1784353003

Cr-Commit-Position: refs/heads/master@{#34731}

Make the low level assembler implementation exact and protected to disallow explicit usage.

BUG=

Review URL: https://codereview.chromium.org/1749263002

Cr-Commit-Position: refs/heads/master@{#34673}

R=mstarzinger@chromium.org,bmeurer@chromium.org,adamk@chromium.org
BUG=v8:3956
LOG=Y

Review URL: https://codereview.chromium.org/1773653002

Cr-Commit-Position: refs/heads/master@{#34669}

NOPRESUBMIT=true
BUG=

Review URL: https://codereview.chromium.org/1776353002

Cr-Commit-Position: refs/heads/master@{#34664}

- Eliminate stubs with a variable number of arguments.
  (That only worked due to their very limited use. These
   stubs' interface descriptors were basically lying
   about their number of args, which will fail when used
   generically.)
- Fix all CallApi*Stubs' interface descriptors to no
  longer lie about their arguments.
- Unify CallApi*Stub, for * in Function, Accessor,
  FunctionWithFixedArgs.
  (Since these are now all doing the same thing.)
- Rename the unified stub (and interface descriptors) to
  *ApiCallback*, since that's really what they're doing.
- Refuse inlining an API callback if its number of
  parameters exceeds the supported number of args.

BUG=

Committed: https://crrev.com/d238b953a474272c0e3ea22ef6a9b63fa9729340
Cr-Commit-Position: refs/heads/master@{#34614}

Review URL: https://codereview.chromium.org/1748123003

Cr-Commit-Position: refs/heads/master@{#34627}