Bytecode expectations have been moved to external (.golden) files,
one per test. Each test in the suite builds a representation of the
the compiled bytecode using BytecodeExpectationsPrinter. The output is
then compared to the golden file. If the comparision fails, a textual
diff can be used to identify the discrepancies.

Only the test snippets are left in the cc file, which also allows to
make it more compact and meaningful. Leaving the snippets in the cc
file was a deliberate choice to allow keeping the "truth" about the
tests in the cc file, which will rarely change, as opposed to golden
files.

Golden files can be generated and kept up to date using
generate-bytecode-expectations, which also means that the test suite
can be batch updated whenever the bytecode or golden format changes.

The golden format has been slightly amended (no more comments about
`void*`, add size of the bytecode array) following the consideration
made while converting the tests.

There is also a fix: BytecodeExpectationsPrinter::top_level_ was left
uninitialized, leading to undefined behaviour.

BUG=v8:4280
LOG=N

Review URL: https://codereview.chromium.org/1717293002

Cr-Commit-Position: refs/heads/master@{#34285}

This is to help debugging missing break locations.

R=vogelheim@chromium.org

Review URL: https://codereview.chromium.org/1732253002

Cr-Commit-Position: refs/heads/master@{#34284}

We already have a code stub that implements Typeof, so we don't
need a special runtime entry here to implement the TypeOf handler.

R=rmcilroy@chromium.org

Review URL: https://codereview.chromium.org/1732273002

Cr-Commit-Position: refs/heads/master@{#34283}

Handles stack overflow in interpreter.
1. When visiting function literal, if the shared function
 info cannot be found we should return a stack overflow.
2. When visiting the ast graph, if stack overflow happens
 then all the ast nodes are not visited, so we need to have
appropriate handling in the AccumulatorResultScope and
RegisterResultScope.
3. MakeBytecode should not return a suceess unconditionally.
If there is a stack overflow, it should return false, so
RangeError can be thrown.

BUG=v8:4280,v8:4680
LOG=N

Review URL: https://codereview.chromium.org/1721983005

Cr-Commit-Position: refs/heads/master@{#34282}

Follow up after:
https://codereview.chromium.org/1713993002/

BUG=chromium:535160
LOG=n
TBR=tandrii@chromium.org, jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1733273002

Cr-Commit-Position: refs/heads/master@{#34281}

BUG=v8:4779
LOG=n
NOTRY=true
TBR=bmeurer@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/1729263006

Cr-Commit-Position: refs/heads/master@{#34280}

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1724193003

Cr-Commit-Position: refs/heads/master@{#34279}

I turn the test off for now. The problem is that mips does not deal with
signalling NaNs as expected.

@v8-mips-ports: Could it be that the mips simulator deals differently
with signalling NaNs than the actual hardware? The implementation that
is tested in these tests assumes that sNaN * 1.0 = qNaN, where the bits
of sNaN and qNaN are equal except for the most significant mantissa bit.
This assumption holds for the simulator, but seems not to hold for actual
mips hardware. Do you know more about that?

R=mstarzinger@chromium.org, titzer@chromium.org, v8-mips-ports@googlegroups.com

Review URL: https://codereview.chromium.org/1735673003

Cr-Commit-Position: refs/heads/master@{#34278}

  port ee8108b7 (r34246)

  original commit message:
  This implements proper handling of local control flow (i.e. break and
  continue) that spans the boundary of a do-expression. We can no longer
  determine the number of operands to be dropped from the nesting of
  statements alone, instead we use the new precise operand stack depth
  tracking.

BUG=

Review URL: https://codereview.chromium.org/1735853002

Cr-Commit-Position: refs/heads/master@{#34277}

This filters test and third_party files to get a speed-up
when running tests and when collecting profile data.

BUG=chromium:568949
LOG=n

Committed: https://crrev.com/761ee31be5ab4fde05c294e5d632608fbaea8ad4
Cr-Commit-Position: refs/heads/master@{#34216}

Committed: https://crrev.com/906db7448702a6ac9fab2a445c57cc85f6dd1b1a
Cr-Commit-Position: refs/heads/master@{#34253}

Committed: https://crrev.com/fe38ad573ee737e06a74b7fcd73f557ac0f1135a
Cr-Commit-Position: refs/heads/master@{#34272}

Review URL: https://codereview.chromium.org/1730543002

Cr-Commit-Position: refs/heads/master@{#34276}

Revert of [coverage] Filter some files from instrumentation. (patchset #4 id:60001 of https://codereview.chromium.org/1730543002/ )

Reason for revert:
Prevents using goma with make.

Original issue's description:
> [coverage] Filter some files from instrumentation.
>
> This filters test and third_party files to get a speed-up
> when running tests and when collecting profile data.
>
> BUG=chromium:568949
> LOG=n
>
> Committed: https://crrev.com/761ee31be5ab4fde05c294e5d632608fbaea8ad4
> Cr-Commit-Position: refs/heads/master@{#34216}
>
> Committed: https://crrev.com/906db7448702a6ac9fab2a445c57cc85f6dd1b1a
> Cr-Commit-Position: refs/heads/master@{#34253}
>
> Committed: https://crrev.com/fe38ad573ee737e06a74b7fcd73f557ac0f1135a
> Cr-Commit-Position: refs/heads/master@{#34272}

TBR=tandrii@chromium.org,kjellander@chromium.org,jfb@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:568949

Review URL: https://codereview.chromium.org/1733213002

Cr-Commit-Position: refs/heads/master@{#34275}

Migrate Math.imul, Math.fround, Math.acos, Math.asin and Math.atan to
C++ builtins, as these ones call into C++ anyway and so there's no
need to have this extra wrapper around it.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1731543004

Cr-Commit-Position: refs/heads/master@{#34274}

This optimization does not give us much (see perf try bot results associated with this CL) but complicates things a lot. The main motivation is to avoid additional complexity in tail call optimization.

There are some pieces left in the deoptimizer, but I'll address this in a separate CL.

Review URL: https://codereview.chromium.org/1731273003

Cr-Commit-Position: refs/heads/master@{#34273}

This filters test and third_party files to get a speed-up
when running tests and when collecting profile data.

BUG=chromium:568949
LOG=n

Committed: https://crrev.com/761ee31be5ab4fde05c294e5d632608fbaea8ad4
Cr-Commit-Position: refs/heads/master@{#34216}

Committed: https://crrev.com/906db7448702a6ac9fab2a445c57cc85f6dd1b1a
Cr-Commit-Position: refs/heads/master@{#34253}

Review URL: https://codereview.chromium.org/1730543002

Cr-Commit-Position: refs/heads/master@{#34272}

BUG=

Review URL: https://codereview.chromium.org/1740543002

Cr-Commit-Position: refs/heads/master@{#34271}

  port 666aec03 (r34237)

  original commit message:
  Since both null and undefined are also marked as undetectable now, we
  can just test that bit instead of having the CompareNilIC try to collect
  feedback to speed up the general case (without the undetectable bit
  being used).

  Drive-by-fix: Update the type system to match the new handling of
  undetectable in the runtime.

BUG=

Review URL: https://codereview.chromium.org/1731383003

Cr-Commit-Position: refs/heads/master@{#34270}

When there is no receiver object, plain function calls are a few
percent faster than %_Call().
This patch also fixes the HAS_INDEX macro used in a bunch of
Array.prototype functions to properly check for elements inherited
from prototypes.

Review URL: https://codereview.chromium.org/1706213002

Cr-Commit-Position: refs/heads/master@{#34269}

Mostly by avoiding unnecessary Handle/HandleScope creation,
"length" property lookups, and length conversions.
This yields about 60% speedup on the microbenchmark I tested with.

Note that the C++ builtin is the middle performance tier of three,
so not every Array.push use case will be affected by this patch.

Review URL: https://codereview.chromium.org/1716833002

Cr-Commit-Position: refs/heads/master@{#34268}

Port c129aa4d

Original commit message:
    These macro operators represent a conditional eager deoptimization exit
    without explicit branching, which greatly reduces overhead of both
    scheduling and register allocation, and thereby greatly reduces overall
    compilation time, esp. when there are a lot of eager deoptimization
    exits.

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

Review URL: https://codereview.chromium.org/1730383002

Cr-Commit-Position: refs/heads/master@{#34267}

Port 666aec03

Original commit message:
    Since both null and undefined are also marked as undetectable now, we
    can just test that bit instead of having the CompareNilIC try to collect
    feedback to speed up the general case (without the undetectable bit
    being used).

    Drive-by-fix: Update the type system to match the new handling of
    undetectable in the runtime.

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

Review URL: https://codereview.chromium.org/1733663003

Cr-Commit-Position: refs/heads/master@{#34266}

Rolling v8/tools/clang to 8598a726360f2722f4db0eab732a5f6b4cb41eb9

Rolling v8/tools/swarming_client to 71c61c858bb2c2deda83781978fe65e94171f58f

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

Review URL: https://codereview.chromium.org/1729263004

Cr-Commit-Position: refs/heads/master@{#34265}

Port ee8108b7

Original commit message:
    This implements proper handling of local control flow (i.e. break and
    continue) that spans the boundary of a do-expression. We can no longer
    determine the number of operands to be dropped from the nesting of
    statements alone, instead we use the new precise operand stack depth
    tracking.

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
TEST=mjsunit/harmony/do-expressions-control
BUG=v8:4488
LOG=n

Review URL: https://codereview.chromium.org/1735623002

Cr-Commit-Position: refs/heads/master@{#34264}

This makes the aforementioned emitting function independent of the
target architecture by leveraging existing abstractions.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1730243002

Cr-Commit-Position: refs/heads/master@{#34263}

There was a bug in for-of loops without newly declared variables: If,
in performing the assignment, an exception were thrown, then
IteratorClose would not be called. The problem was that the assignment
is done as part of assign_each, which happens before the loop is put
back in the state which is recognized to be breaking/throwing/returning
early.

This patch modifies the for-of desugaring by setting the loop state
before, rather than after, evaluating the assign_each portion, which is
responsible for evaluating the assignment in for-of loops which do not
have a declaration.

This patch, together with https://codereview.chromium.org/1728973002 ,
allow all test262 iterator return-related tests to pass.

R=rossberg
BUG=v8:4776
LOG=Y

Review URL: https://codereview.chromium.org/1731773003

Cr-Commit-Position: refs/heads/master@{#34262}

In the for-of desugaring, IteratorClose is a subtle thing to get right.
When return exists, the logic for which exception to throw is as follows:
1. Get the 'return' property and property any exception that might come from
  the property read
2. Call return, not yet propagating an exception if it's thrown.
3. If we are closing the iterator due to an exception, propagate that error.
4. If return threw, propagate that error.
5. Check if return's return value was not an object, and throw if so

Previously, we were effectively doing step 5 even if an exception "had already
been thrown" by step 3. Because this took place in a finally block, the exception
"won the race" and was the one propagated to the user. The fix is a simple change
to the desugaring to do step 5 only if step 3 didn't happen.

R=rossberg
BUG=v8:4775
LOG=Y

Review URL: https://codereview.chromium.org/1728973002

Cr-Commit-Position: refs/heads/master@{#34261}

Per MIPS O32 ABI the first four arguments must be passed via
the a0-a3 registers and they must be on the stack as well.

TEST=cctest/test-run-wasm/*
BUG=

Review URL: https://codereview.chromium.org/1730763002

Cr-Commit-Position: refs/heads/master@{#34260}

This makes the FullCodeGenerator::EmitNamedPropertyLoad be architecture
independent by adding MacroAssembler::Move helpers.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1734643002

Cr-Commit-Position: refs/heads/master@{#34259}

Revert of [coverage] Filter some files from instrumentation. (patchset #3 id:40001 of https://codereview.chromium.org/1730543002/ )

Reason for revert:
This breaks `gclient sync` because v8_target_arch isn't defined.

gyp: name 'v8_target_arch' is not defined while evaluating condition
'(OS=="linux" or OS=="mac") and (target_arch=="ia32" or target_arch=="x64") and
         (v8_target_arch!="x87" and v8_target_arch!="x32") and coverage==0' in
/media/jfb/ssd/v8/v8/build/all.gyp
Error: Command '/usr/bin/python v8/build/gyp_v8' returned non-zero exit status 1
in /media/jfb/ssd/v8

Original issue's description:
> [coverage] Filter some files from instrumentation.
>
> This filters test and third_party files to get a speed-up
> when running tests and when collecting profile data.
>
> BUG=chromium:568949
> LOG=n
>
> Committed: https://crrev.com/761ee31be5ab4fde05c294e5d632608fbaea8ad4
> Cr-Commit-Position: refs/heads/master@{#34216}
>
> Committed: https://crrev.com/906db7448702a6ac9fab2a445c57cc85f6dd1b1a
> Cr-Commit-Position: refs/heads/master@{#34253}

TBR=tandrii@chromium.org,kjellander@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:568949

Review URL: https://codereview.chromium.org/1737433002

Cr-Commit-Position: refs/heads/master@{#34258}

Everything that HCallFunction does can be easily done using more general HCallWithDescriptor, so there's no need to have this dedicated instruction around.

Review URL: https://codereview.chromium.org/1731303002

Cr-Commit-Position: refs/heads/master@{#34257}

This reduces the memory consumption of SourcePositionTable by ca. 2/3.
Over Octane, this reduces the source position table memory consumption
from ~370kB to ~115kB, which makes it ca. 10% of the total bytecode size
(~1.1MB)

----------------

Reland CL in order to relive the glory days, and also fix memory leak w/ ENABLE_SLOW_CHECKS.

SourcePositionTableBuilder used to have a no destructor since everything
was zone allocated. But if ENABLE_SLOW_CHECKS, it has a heap allocated member
and thus needs a proper constructor. ASAN thankfully notices this, and V8 no
longer builds since this is called during mksnapshot.

Breakge example: http://build.chromium.org/p/client.v8/builders/V8%20Linux64%20ASAN%20arm64%20-%20debug%20builder/builds/4829

R=jochen@chromium.org, yangguo@chromium.org, rmcilroy@chromium.org
BUG=v8:4690
LOG=y

Committed: https://crrev.com/a6f41f7b8226555c5900440f6e3092b3545ee0f6
Cr-Commit-Position: refs/heads/master@{#34250}

patch from issue 1704943002 at patchset 200001 (http://crrev.com/1704943002#ps200001)

Review URL: https://codereview.chromium.org/1731883003

Cr-Commit-Position: refs/heads/master@{#34256}

This fixes a corner case that triggered an assert in full-codegens
operand stack depth tracking. We stop pushing operands if we overflow
the C-stack while iterating the AST. This makes the tracking go out of
sync before we fully returned from the tree traversal, at which point
the thrown RangeError will abort compilation.

R=ishell@chromium.org
TEST=mjsunit/regress/regress-crbug-589472
BUG=chromium:589472
LOG=n

Review URL: https://codereview.chromium.org/1732903002

Cr-Commit-Position: refs/heads/master@{#34255}

This patch moves for-of closing to staging. There are a couple of
minor semantics bugs remaining in finalization along edge cases, but
we don't know of any stability issues.

BUG=v8:3566
R=rossberg
LOG=Y

Review URL: https://codereview.chromium.org/1725203002

Cr-Commit-Position: refs/heads/master@{#34254}

This filters test and third_party files to get a speed-up
when running tests and when collecting profile data.

BUG=chromium:568949
LOG=n

Committed: https://crrev.com/761ee31be5ab4fde05c294e5d632608fbaea8ad4
Cr-Commit-Position: refs/heads/master@{#34216}

Review URL: https://codereview.chromium.org/1730543002

Cr-Commit-Position: refs/heads/master@{#34253}

Revert of [Interpreter] Implements calls through CallICStub in the interpreter. (patchset #15 id:270001 of https://codereview.chromium.org/1688283003/ )

Reason for revert:
It is not a good idea to call CallICStub from the builtin. It might be sensitive to the frame structure. Constructing a internal frame might cause problems. It is much better to inline the code  related to the type feedback vector into the builtin.

Original issue's description:
> [Interpreter] Implements calls through CallICStub in the interpreter.
>
> Calls are implemented through CallICStub to collect type feedback. Adds
> a new builtin called InterpreterPushArgsAndCallIC that pushes the
> arguments onto stack and calls CallICStub.
>
> Also adds two new bytecodes CallIC and CallICWide to indicate calls have to
> go through CallICStub.
>
> MIPS port contributed by balazs.kilvady.
>
> BUG=v8:4280, v8:4680
> LOG=N
>
> Committed: https://crrev.com/20362a2214c11a0f2ea5141b6a79e09458939cec
> Cr-Commit-Position: refs/heads/master@{#34244}

TBR=rmcilroy@chromium.org,mvstanton@chromium.org,mstarzinger@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4280, v8:4680

Review URL: https://codereview.chromium.org/1731253003

Cr-Commit-Position: refs/heads/master@{#34252}

Revert of Encode interpreter::SourcePositionTable as variable-length ints. (patchset #10 id:200001 of https://codereview.chromium.org/1704943002/ )

Reason for revert:
Build failure on Linux64 arm64 ASAN:

http://build.chromium.org/p/client.v8/builders/V8%20Linux64%20ASAN%20arm64%20-%20debug%20builder/builds/4829

(Leaks memory, somehow.)

Original issue's description:
> Encode interpreter::SourcePositionTable as variable-length ints.
>
> This reduces the memory consumption of SourcePositionTable by ca. 2/3.
> Over Octane, this reduces the source position table memory consumption
> from ~370kB to ~115kB, which makes it ca. 10% of the total bytecode size
> (~1.1MB)
>
> BUG=
>
> Committed: https://crrev.com/a6f41f7b8226555c5900440f6e3092b3545ee0f6
> Cr-Commit-Position: refs/heads/master@{#34250}

TBR=jochen@chromium.org,rmcilroy@chromium.org,yangguo@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/1728193003

Cr-Commit-Position: refs/heads/master@{#34251}

This reduces the memory consumption of SourcePositionTable by ca. 2/3.
Over Octane, this reduces the source position table memory consumption
from ~370kB to ~115kB, which makes it ca. 10% of the total bytecode size
(~1.1MB)

BUG=

Review URL: https://codereview.chromium.org/1704943002

Cr-Commit-Position: refs/heads/master@{#34250}

(a EQ b) is lowered to ((low(a) XOR low(b)) OR (high(a) XOR high(b))) EQ 0

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1729493002

Cr-Commit-Position: refs/heads/master@{#34249}

There was an eval inside the array_natives_test() which prevented
Crankshaft, even tho it's unrelated, and so we always went to TurboFan
now, which both decreased test coverage and increased time for stress
opt runs.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1725383002

Cr-Commit-Position: refs/heads/master@{#34248}

Revert of [coverage] Filter some files from instrumentation. (patchset #2 id:20001 of https://codereview.chromium.org/1730543002/ )

Reason for revert:
[Sheriff] Breaks local make builds.

Original issue's description:
> [coverage] Filter some files from instrumentation.
>
> This filters test and third_party files to get a speed-up
> when running tests and when collecting profile data.
>
> BUG=chromium:568949
> LOG=n
> NOTRY=true
>
> Committed: https://crrev.com/761ee31be5ab4fde05c294e5d632608fbaea8ad4
> Cr-Commit-Position: refs/heads/master@{#34216}

TBR=tandrii@chromium.org,kjellander@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:568949

Review URL: https://codereview.chromium.org/1727383002

Cr-Commit-Position: refs/heads/master@{#34247}

This implements proper handling of local control flow (i.e. break and
continue) that spans the boundary of a do-expression. We can no longer
determine the number of operands to be dropped from the nesting of
statements alone, instead we use the new precise operand stack depth
tracking.

R=jarin@chromium.org
TEST=mjsunit/harmony/do-expressions-control
BUG=v8:4488
LOG=n

Review URL: https://codereview.chromium.org/1724753002

Cr-Commit-Position: refs/heads/master@{#34246}