The CPPGC_BUILD_IN_V8 define (used for tracing) isn't propagated from
v8_base_without_compiler to cppgc_base, which breaks build with
perfetto. Instead use a gn args to specify standalone builds (defaulted
to false) and use that to choose the right tracing implementation.

Bug: chromium:1056170
Change-Id: I70bce819d45fb133b6f932a50a5d027e39f3e5b9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2555007
Auto-Submit: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71356}

This CL removes the GetTraceDescriptor virtual call from garbage
collected mixins and replaces it with querying the object start
bitmap.

The CL also removes the mixin macros which are now no longer needed.

Bug: chromium:1056170
Change-Id: I27ed299f93025d09a3bb3f0d17b14bed3c200565
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2287508Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68787}

The benchmarks cover static vs dynamic tracing of an object where the
header is computed statically vs using the object start bitmap,
respectively.

$ out/x64.release/cppgc_basic_benchmarks --benchmark_filter=Trace/*

Running out/x64.release/cppgc_basic_benchmarks
Run on (56 X 3500 MHz CPU s)
CPU Caches:
  L1 Data 32 KiB (x28)
  L1 Instruction 32 KiB (x28)
  L2 Unified 256 KiB (x28)
  L3 Unified 35840 KiB (x2)
Load Average: 0.24, 0.26, 0.26
--------------------------------------------------------
Benchmark              Time             CPU   Iterations
--------------------------------------------------------
Trace/Static        1.78 ns         1.78 ns    393324147
Trace/Dynamic       3.27 ns         3.27 ns    215078276

2020-07-03T15: 21:25+02:00
Change-Id: I8bf5a8ed71a8991873160353e26f96214c038730
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2280099
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68675}

Output:

$ out/x64.release/cppgc_allocation_benchmark --benchmark_repetitions=3

Running out/x64.release/cppgc_allocation_benchmark
Run on (56 X 3500 MHz CPU s)
CPU Caches:
  L1 Data 32 KiB (x28)
  L1 Instruction 32 KiB (x28)
  L2 Unified 256 KiB (x28)
  L3 Unified 35840 KiB (x2)
Load Average: 0.23, 0.27, 0.27
--------------------------------------------------------------------------------
Benchmark                      Time             CPU   Iterations UserCounters...
--------------------------------------------------------------------------------
Allocate/Tiny               17.0 ns         17.0 ns     40348381 bytes_per_second=55.9692M/s
Allocate/Tiny               17.1 ns         17.1 ns     40348381 bytes_per_second=55.8961M/s
Allocate/Tiny               17.2 ns         17.2 ns     40348381 bytes_per_second=55.3108M/s
Allocate/Tiny_mean          17.1 ns         17.1 ns            3 bytes_per_second=55.7254M/s
Allocate/Tiny_median        17.1 ns         17.1 ns            3 bytes_per_second=55.8961M/s
Allocate/Tiny_stddev       0.112 ns        0.111 ns            3 bytes_per_second=369.571k/s
Allocate/Large             40339 ns        40334 ns        17707 bytes_per_second=1.51326G/s
Allocate/Large             40350 ns        40343 ns        17707 bytes_per_second=1.51292G/s
Allocate/Large             40205 ns        40192 ns        17707 bytes_per_second=1.51861G/s
Allocate/Large_mean        40298 ns        40290 ns            3 bytes_per_second=1.51493G/s
Allocate/Large_median      40339 ns        40334 ns            3 bytes_per_second=1.51326G/s
Allocate/Large_stddev       81.2 ns         84.7 ns            3 bytes_per_second=3.26614M/s

2020-07-03T09: 14:23+02:00
Change-Id: I25a55beb5ea1718af76e638b752bf7d67cfe373e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2280086Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68672}

This adds Google benchmark for microbenchmarking C++ code as an
optional dependency.

To enable, add the following to the .gclient before syncing
  "custom_vars": {
      "checkout_google_benchmark": True
  }

Change-Id: Id0eab772dd71558906658ef4bb60e31acd665948
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2275964Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68663}