denoland-rusty-v8/.gn

# This file is used by the GN meta build system to find the root of the source
# tree and to set startup options. For documentation on the values set in this
# file, run "gn help dotfile" at the command line.

# The location of the build configuration file.
buildconfig = "//build/config/BUILDCONFIG.gn"

# These are the targets to check headers for by default. The files in targets
# matching these patterns (see "gn help label_pattern" for format) will have
# their includes checked for proper dependencies when you run either
# "gn check" or "gn gen --check".
check_targets = []

# The secondary source root is a parallel directory tree where
# GN build files are placed when they can not be placed directly
# in the source tree, e.g. for third party source trees.
secondary_source = "//v8/"

default_args = {
  clang_use_chrome_plugins = false
  is_component_build = false
  linux_use_bundled_binutils = false
  use_dummy_lastchange = true
  use_sysroot = false
  win_crt_flavor_agnostic = true

  # Minimize size of debuginfo in distributed static library.
  line_tables_only = true
  no_inline_line_tables = true
  symbol_level = 1
  use_debug_fission = false

  v8_embedder_string = "-rusty"

  v8_enable_sandbox = false
  v8_enable_javascript_promise_hooks = true
  v8_promise_internal_field_count = 1
  v8_use_external_startup_data = false
  v8_use_snapshot = true

  # This flag speeds up the performance of fork/execve on Linux systems for
  # embedders which use it (like Node.js). It works by marking the pages that
  # V8 allocates as MADV_DONTFORK. Without MADV_DONTFORK, the Linux kernel
  # spends a long time manipulating page mappings on fork and exec which the
  # child process doesn't generally need to access.
  v8_enable_private_mapping_fork_optimization = true

  # We prefer embedders to bring their own compression
  v8_use_zlib = false
  v8_enable_snapshot_compression = false

  # Disable handle zapping for performance
  v8_enable_handle_zapping = false
  # Ensure allocation of typed arrays and arraybuffers always goes through
  # the embedder's ArrayBufferAllocator, otherwise small buffers get moved
  # around by the garbage collector but embedders normally want them to have
  # fixed addresses.
  v8_typed_array_max_size_in_heap = 0

  # Historically these always had 2 slots. Keep for compat.
  v8_array_buffer_internal_field_count = 2
  v8_array_buffer_view_internal_field_count = 2

  # Enabling the shared read-only heap comes with a restriction that all
  # isolates running at the same time must be created from the same snapshot.
  # This is problematic for Deno, which has separate "runtime" and "typescript
  # compiler" snapshots, and sometimes uses them both at the same time.
  v8_enable_shared_ro_heap = false

  # V8 11.6 hardcoded an assumption in `mksnapshot` that shared RO heap
  # is enabled. In our case it's disabled so without this flag we can't
  # compile.
  v8_enable_verify_heap = false

  # Enable V8 object print for debugging.
  # v8_enable_object_print = true
  
  # V8 12.3 added google/fuzztest as a third party dependency.
  # https://chromium.googlesource.com/v8/v8.git/+/d5acece0c9b89b18716c177d1fcc8f734191e1e2%5E%21/#F4
  #
  # This flag disables it.
  v8_enable_fuzztest = false

  # Disable v8::HandleScope LIFO checks.
  # https://chromium-review.googlesource.com/c/v8/v8/+/5110566
  #
  # rusty_v8 scopes are not on the stack.
  v8_enable_v8_checks = false
}