Pass --no-lazy-feedback-allocation in all second runs depending
on a probability. Also combine with --interrupt-budget=100.

This also allows adding several extra flags behind one probability.
The tests are improved to ensure valid flags and configs.

No-Try: true
Bug: v8:10215
Change-Id: I2766ef5044cd8c7096f6b76f39b60b568f550bde
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2059991
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66289}

This will allow sharing the configs between Python and JavaScript
based fuzzers.

No-Try: true
Bug: chromium:1044942
Change-Id: Idd47ad31430cfed0629dbb5b9dd5fd2ef8c764f6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2051951Reviewed-by: Liviu Rau <liviurau@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66243}

We used the same random seed for all test cases of a fuzz session
for transitioning from choosing the flags on V8 side.

Since the grace period for stable bisection is over, we now use
the same random number generator throughout the fuzz session which
leads to a wider range of differently chosen flags.

TBR=tmrts@chromium.org

No-Try: true
Bug: chromium:813833
Change-Id: I07b9fe5de378c01344afd486bfd85fcbf0fcd8d2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1906377Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64910}

No-Try: true
Bug: chromium:1021463
Change-Id: I15d45a51b7341b5767d8eb4c16e7d41508a2811b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1906568Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64862}

NOTRY=true

Bug: v8:9946
Change-Id: If5b5470709edeaa13f7dea4ca83948e28356f352
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1901268Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64810}

This adds a fake toolchain for pointer compression, used for
correctness fuzzing. The toolchain enables us to have an extra build
with inverse pointer-compression defaults side-by-side.

The extra build is used similarly to existing x64/x86 comparisons,
except that we now compare builds with different compile-time flags.

Change-Id: I75491371262204b86eaa006ca8d04848f49121ac
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1829275Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64123}

NOTRY=true

Change-Id: Icb4c3a1a544331baab5d6637daa12bea87044715
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1829268
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64038}

NOTRY=true

Change-Id: Ie96e645851beb26e9a777379ad68f1c173acd80d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1829266Reviewed-by: Clemens Backes [né Hammacher] <clemensb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64036}

NOTRY=true

Bug: chromium:813833,chromium:983128
Change-Id: I449796b761f53bb15a3563604d5a4a9018035cb6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1697255Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62662}

In order to migrate the extra flags into the fuzzer and keep bisection stable,
we need to use the same RNG state for each call to generating fuzz flags.

Throughout one fuzzing session the same random-seed is used
(https://crbug.com/983128) and we'll pass it to the fuzz config in a follow up.

TBR=tmrts@chromium.org
NOTRY=true

Bug: chromium:813833
Change-Id: I3203c86028a5d283238e6ef739f82eccee1302b1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1697254
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62646}

We have too many dupes in the no-ic comparisons. We'll increase the
experiment size again once bugs are fixed.

TBR=jarin@chromium.org
NOTRY=true

Bug: chromium:961709
Change-Id: Ic946100b45fd73e1bee59f188a766384836bcdcf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1660624Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62212}

NOTRY=true

Bug: v8:9277
Change-Id: If385439e2bdd8146fe3ba5734920b2096b6c1789
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1622853Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61724}

NOTRY=true

Change-Id: I71c5fbfbb58cd13613506acabf446d9cffc6d23b
Reviewed-on: https://chromium-review.googlesource.com/c/1451837Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59333}

This replaces the "trusted" with the "jitless" correctness-fuzzing experiment.
The former is a no-op already.

NOTRY=true

Bug: v8:8778
Change-Id: Ie9b490df27071980b2049148844b8f716bbbb1f7
Reviewed-on: https://chromium-review.googlesource.com/c/1450120Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59313}

Instead of having a separate liftoff config, which is tested against
the default (which currently means tier-up from liftoff to turbofan),
just choose reasonable liftoff configs for the existing configs.
'ignition' now implies pure liftoff execution.
'ignition_turbo_opt' always compiles with turbofan.
Other configs use the default (tier up).

R=machenbach@chromium.org

Bug: chromium:824098, v8:6600
Change-Id: I92c008fc1b1fa54d3161fb5695a095127d6ac263
Reviewed-on: https://chromium-review.googlesource.com/1141731Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54548}

This adds 5% testing of 'ignition' vs 'liftoff', which tests Turbofan vs
Liftoff for wasm code, and tests Ignition vs Turbofan for javascript
code.
It also adds 3% testing of 'liftoff' (x64) vs 'liftoff' (ia32), which
does standard x64 vs ia32 testing for javascript code.

R=machenbach@chromium.org

Bug: chromium:824098, v8:6600
Change-Id: I6a6afae0300efc33f3535541a11695a7bb32dcc5
Reviewed-on: https://chromium-review.googlesource.com/973161
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52111}

We'll soon also host other configurations for general fuzzing, not only
correctness fuzzing in the new tools/clusterfuzz folder.

TBR=yangguo@chromium.org

Bug: chromium:813833
Change-Id: Icd966bfec91cc547522bad5d1a842500b554754f
Reviewed-on: https://chromium-review.googlesource.com/930331Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51480}

Before, configurations were chosen on clusterfuzz side. This migrates
the choice to the V8 repo, to enable easier changing it and to allow
sharing it between different fuzzers.

NOTRY=true
TBR=sergiyb@chromium.org

Bug: chromium:813833
Change-Id: I9890a36fd6aab171d3e13172fc55b274f189e532
Reviewed-on: https://chromium-review.googlesource.com/927681Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51410}