features.gypi

# Copyright 2013 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#     * Neither the name of Google Inc. nor the names of its
#       contributors may be used to endorse or promote products derived
#       from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Compile time controlled V8 features.

{
  'variables': {
    'v8_target_arch%': '<(target_arch)',

    'v8_current_cpu%': '<(target_arch)',

    # Emulate GN variables
    # https://chromium.googlesource.com/chromium/src/build/+/556c524beb09c332698debe1b47b065d5d029cd0/config/BUILDCONFIG.gn#269
    'conditions': [
      ['OS == "win" or OS == "winuwp"', {
        'is_win': 1,
      }, {
        'is_win': 0,
      }],
      ['OS == "fuchsia"', {
        'is_fuchsia': 1,
      }, {
        'is_fuchsia': 0,
      }],
      ['OS=="android"', { # GYP reverts OS to linux so use `-D OS=android`
        'is_android': 1,
      }, {
        'is_android': 0,
      }],
      # flattened (!is_win && !is_fuchsia) because of GYP evaluation order
      ['not (OS == "win" or OS == "winuwp") and not (OS == "fuchsia")', {
        'is_posix': 1,
      }, {
        'is_posix': 0,
      }],
      ['component and "library" in component', {
        'is_component_build': 1,
      }, {
        'is_component_build': 0,
      }],
      ['OS == "win" or OS == "mac"', {
        # Sets -DENABLE_SYSTEM_INSTRUMENTATION. Enables OS-dependent event tracing
        'v8_enable_system_instrumentation': 1,
      }, {
        'v8_enable_system_instrumentation': 0,
      }],
      ['OS == "win"', {
        'v8_enable_etw_stack_walking': 1,
      }, {
        'v8_enable_etw_stack_walking': 0,
      }],
      ['OS=="linux"', {
        # Sets -dV8_ENABLE_PRIVATE_MAPPING_FORK_OPTIMIZATION.
        #
        # 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.
        #
        # See v8:7381 for more details.
        'v8_enable_private_mapping_fork_optimization': 1,
      }, {
        'v8_enable_private_mapping_fork_optimization': 0,
      }],
    ],
    'is_debug%': 0,

    # Variables from BUILD.gn

    # Set to 1 to enable DCHECKs in release builds.
    'dcheck_always_on%': 0,

    # Sets -DV8_ENABLE_FUTURE.
    'v8_enable_future%': 0,

    # Sets -DVERIFY_HEAP.
    'v8_enable_verify_heap%': 0,

    # Sets -DVERIFY_PREDICTABLE
    'v8_enable_verify_predictable%': 0,

    # Enable compiler warnings when using V8_DEPRECATED apis.
    'v8_deprecation_warnings%': 0,

    # Enable compiler warnings when using V8_DEPRECATE_SOON apis.
    'v8_imminent_deprecation_warnings%': 0,

    # Allows the embedder to add a custom suffix to the version string.
    'v8_embedder_string%': '',

    # Sets -dENABLE_DISASSEMBLER.
    'v8_enable_disassembler%': 0,

    # Sets the number of internal fields on promise objects.
    'v8_promise_internal_field_count%': 0,

    # Sets -dENABLE_GDB_JIT_INTERFACE.
    'v8_enable_gdbjit%': 0,

    # Sets -dENABLE_HUGEPAGE
    'v8_enable_hugepage%': 0,

    # Sets -dENABLE_VTUNE_JIT_INTERFACE.
    'v8_enable_vtunejit%': 0,

    # Currently set for node by common.gypi, avoiding default because of gyp file bug.
    # Should be turned on only for debugging.
    #'v8_enable_handle_zapping%': 0,

    # Enable fast mksnapshot runs.
    'v8_enable_fast_mksnapshot%': 0,

    # Enable the registration of unwinding info for Windows/x64 and ARM64.
    'v8_win64_unwinding_info%': 1,

    # Enable code comments for builtins in the snapshot (impacts performance).
    'v8_enable_snapshot_code_comments%': 0,

    # Enable native counters from the snapshot (impacts performance, sets
    # -dV8_SNAPSHOT_NATIVE_CODE_COUNTERS).
    # This option will generate extra code in the snapshot to increment counters,
    # as per the --native-code-counters flag.
    'v8_enable_snapshot_native_code_counters%': 0,

    # Use pre-generated static root pointer values from static-roots.h.
    'v8_enable_static_roots%': 0,

    # Enable code-generation-time checking of types in the CodeStubAssembler.
    'v8_enable_verify_csa%': 0,

    # Enable pointer compression (sets -dV8_COMPRESS_POINTERS).
    'v8_enable_pointer_compression%': 0,
    'v8_enable_31bit_smis_on_64bit_arch%': 0,

    # Sets -dV8_SHORT_BUILTIN_CALLS
    'v8_enable_short_builtin_calls%': 0,

    # Sets -dOBJECT_PRINT.
    'v8_enable_object_print%': 0,

    # Sets -dV8_TRACE_MAPS.
    'v8_enable_trace_maps%': 0,

    # Sets -dV8_ENABLE_CHECKS.
    'v8_enable_v8_checks%': 0,

    # Sets -dV8_TRACE_IGNITION.
    'v8_enable_trace_ignition%': 0,

    # Sets -dV8_TRACE_FEEDBACK_UPDATES.
    'v8_enable_trace_feedback_updates%': 0,

    # Sets -dV8_ATOMIC_OBJECT_FIELD_WRITES and turns all field write operations
    # into relaxed atomic operations.
    'v8_enable_atomic_object_field_writes%': 1,

    # Has no effect in Node.js. Here for completeness with V8's config.
    'v8_enable_concurrent_marking%': 1,

    # Enables various testing features.
    'v8_enable_test_features%': 0,

    # With post mortem support enabled, metadata is embedded into libv8 that
    # describes various parameters of the VM for use by debuggers. See
    # tools/gen-postmortem-metadata.py for details.
    'v8_postmortem_support%': 0,

    # Use Siphash as added protection against hash flooding attacks.
    'v8_use_siphash%': 0,

    # Use Perfetto (https://perfetto.dev) as the default TracingController. Not
    # currently implemented.
    'v8_use_perfetto%': 0,

    # Controls the threshold for on-heap/off-heap Typed Arrays.
    'v8_typed_array_max_size_in_heap%': 64,

    # Enable sharing read-only space across isolates.
    # Sets -DV8_SHARED_RO_HEAP.
    'v8_enable_shared_ro_heap%': 0,

    # Enable lazy source positions by default.
    'v8_enable_lazy_source_positions%': 1,

    # Enable third party HEAP library
    'v8_enable_third_party_heap%': 0,

    # Libaries used by third party heap
    'v8_third_party_heap_libs%': [],

    # Source code used by third party heap
    'v8_third_party_heap_files%': [],

    # Disable write barriers when GCs are non-incremental and
    # heap has single generation.
    'v8_disable_write_barriers%': 0,

    # Redirect allocation in young generation so that there will be
    # only one single generation.
    'v8_enable_single_generation%': 0,

    # Use token threaded dispatch for the regular expression interpreter.
    # Use switch-based dispatch if this is false.
    'v8_enable_regexp_interpreter_threaded_dispatch%': 1,

    # Disable all snapshot compression.
    'v8_enable_snapshot_compression%': 0,

    # Enable control-flow integrity features, such as pointer authentication
    # for ARM64.
    'v8_control_flow_integrity%': 0,

    # Enable V8 zone compression experimental feature.
    # Sets -DV8_COMPRESS_ZONES.
    'v8_enable_zone_compression%': 0,

    # Enable the experimental V8 sandbox.
    # Sets -DV8_ENABLE_SANDBOX.
    'v8_enable_sandbox%': 0,

    # Experimental feature for collecting per-class zone memory stats.
    # Requires use_rtti = true
    'v8_enable_precise_zone_stats%': 0,

    # Experimental feature that uses SwissNameDictionary instead of NameDictionary
    # as the backing store for all dictionary mode objects.
    'v8_enable_swiss_name_dictionary%': 0,

    # Experimental feature for tracking constness of properties in non-global
    # dictionaries. Enabling this also always keeps prototypes in dict mode,
    # meaning that they are not switched to fast mode.
    # Sets -DV8_DICT_PROPERTY_CONST_TRACKING
    'v8_dict_property_const_tracking%': 0,

    # Allow for JS promise hooks (instead of just C++).
    'v8_enable_javascript_promise_hooks%': 0,

    # Enable allocation folding globally (sets -dV8_ALLOCATION_FOLDING).
    # When it's disabled, the --turbo-allocation-folding runtime flag will be ignored.
    'v8_enable_allocation_folding%': 1,

    # Enable runtime verification of heap snapshots produced for devtools.
    'v8_enable_heap_snapshot_verify%': 0,

    # Enable global allocation site tracking.
    'v8_allocation_site_tracking%': 1,

    'v8_scriptormodule_legacy_lifetime%': 0,

    # Change code emission and runtime features to be CET shadow-stack compliant
    # (incomplete and experimental).
    'v8_enable_cet_shadow_stack%': 0,

    # Compile V8 using zlib as dependency.
    # Sets -DV8_USE_ZLIB
    'v8_use_zlib%': 1,

    # Whether custom embedder snapshots may extend (= allocate new objects in)
    # ReadOnlySpace.
    'v8_enable_extensible_ro_snapshot%': 1,

    # Variables from v8.gni

    # Enable ECMAScript Internationalization API. Enabling this feature will
    # add a dependency on the ICU library.
    'v8_enable_i18n_support%': 1,

    # Lite mode disables a number of performance optimizations to reduce memory
    # at the cost of performance.
    # Sets --DV8_LITE_MODE.
    'v8_enable_lite_mode%': 0,

    # Enable the Turbofan compiler.
    # Sets -dV8_ENABLE_TURBOFAN
    'v8_enable_turbofan%': 1,

    # Enable the Maglev compiler.
    # Sets -dV8_ENABLE_MAGLEV
    'v8_enable_maglev%': 0,

    # Include support for WebAssembly. If disabled, the 'WebAssembly' global
    # will not be available, and embedder APIs to generate WebAssembly modules
    # will fail. Also, asm.js will not be translated to WebAssembly and will be
    # executed as standard JavaScript instead.
    # Sets -dV8_ENABLE_WEBASSEMBLY.
    'v8_enable_webassembly%': 1,

    # Enable advanced BigInt algorithms, costing about 10-30 KiB binary size
    # depending on platform.
    'v8_advanced_bigint_algorithms%': 1
  },

  'target_defaults': {
    'conditions': [
      ['v8_embedder_string!=""', {
        'defines': ['V8_EMBEDDER_STRING="<(v8_embedder_string)"',],
      }],
      ['v8_enable_disassembler==1', {
        'defines': ['ENABLE_DISASSEMBLER',],
      }],
      ['v8_promise_internal_field_count!=0', {
        'defines': ['V8_PROMISE_INTERNAL_FIELD_COUNT=<(v8_promise_internal_field_count)'],
      }],
      ['v8_enable_future==1', {
        'defines': ['V8_ENABLE_FUTURE',],
      }],
      ['v8_enable_lite_mode==1', {
        'defines': ['V8_LITE_MODE',],
      }],
      ['v8_enable_gdbjit==1', {
        'defines': ['ENABLE_GDB_JIT_INTERFACE',],
      }],
      ['v8_enable_hugepage==1', {
        'defines': ['ENABLE_HUGEPAGE',],
      }],
      ['v8_enable_private_mapping_fork_optimization==1', {
        'defines': ['V8_ENABLE_PRIVATE_MAPPING_FORK_OPTIMIZATION'],
      }],
      ['v8_enable_vtunejit==1', {
        'defines': ['ENABLE_VTUNE_JIT_INTERFACE',],
      }],
      ['v8_enable_pointer_compression==1', {
        'defines': [
          'V8_COMPRESS_POINTERS',
          'V8_COMPRESS_POINTERS_IN_ISOLATE_CAGE',
        ],
      }],
      ['v8_enable_pointer_compression==1 or v8_enable_31bit_smis_on_64bit_arch==1', {
        'defines': ['V8_31BIT_SMIS_ON_64BIT_ARCH',],
      }],
      ['v8_enable_short_builtin_calls==1', {
        'defines': ['V8_SHORT_BUILTIN_CALLS',],
      }],
      ['v8_enable_zone_compression==1', {
        'defines': ['V8_COMPRESS_ZONES',],
      }],
      ['v8_enable_sandbox==1', {
        'defines': ['V8_ENABLE_SANDBOX',],
      }],
      ['v8_enable_object_print==1', {
        'defines': ['OBJECT_PRINT',],
      }],
      ['v8_enable_verify_heap==1', {
        'defines': ['VERIFY_HEAP',],
      }],
      ['v8_enable_verify_predictable==1', {
        'defines': ['VERIFY_PREDICTABLE',],
      }],
      ['v8_enable_trace_maps==1', {
        'defines': ['V8_TRACE_MAPS',],
      }],
      ['v8_enable_trace_ignition==1', {
        'defines': ['V8_TRACE_IGNITION',],
      }],
      ['v8_enable_trace_feedback_updates==1', {
        'defines': ['V8_TRACE_FEEDBACK_UPDATES',],
      }],
      ['v8_enable_test_features==1', {
        'defines': [
          'V8_ENABLE_ALLOCATION_TIMEOUT',
          'V8_ENABLE_FORCE_SLOW_PATH',
          'V8_ENABLE_DOUBLE_CONST_STORE_CHECK',
        ],
      }],
      ['v8_enable_v8_checks==1', {
        'defines': ['V8_ENABLE_CHECKS',],
      }],
      ['v8_deprecation_warnings==1', {
        'defines': ['V8_DEPRECATION_WARNINGS',],
      },{
        'defines!': ['V8_DEPRECATION_WARNINGS',],
      }],
      ['v8_imminent_deprecation_warnings==1', {
        'defines': ['V8_IMMINENT_DEPRECATION_WARNINGS',],
      },{
        'defines!': ['V8_IMMINENT_DEPRECATION_WARNINGS',],
      }],
      ['v8_enable_i18n_support==1', {
        'defines': ['V8_INTL_SUPPORT',],
      }],
      # Refs: https://github.com/nodejs/node/pull/23801
      # ['v8_enable_handle_zapping==1', {
      #  'defines': ['ENABLE_HANDLE_ZAPPING',],
      # }],
      ['v8_enable_heap_snapshot_verify==1', {
        'defines': ['V8_ENABLE_HEAP_SNAPSHOT_VERIFY',],
      }],
      ['v8_enable_snapshot_native_code_counters==1', {
        'defines': ['V8_SNAPSHOT_NATIVE_CODE_COUNTERS',],
      }],
      ['v8_enable_single_generation==1', {
        'defines': ['V8_ENABLE_SINGLE_GENERATION',],
      }],
      ['v8_disable_write_barriers==1', {
        'defines': ['V8_DISABLE_WRITE_BARRIERS',],
      }],
      ['v8_enable_third_party_heap==1', {
        'defines': ['V8_ENABLE_THIRD_PARTY_HEAP',],
      }],
      ['v8_enable_atomic_object_field_writes==1', {
        'defines': ['V8_ATOMIC_OBJECT_FIELD_WRITES',],
      }],
      ['v8_enable_lazy_source_positions==1', {
        'defines': ['V8_ENABLE_LAZY_SOURCE_POSITIONS',],
      }],
      ['v8_use_siphash==1', {
        'defines': ['V8_USE_SIPHASH',],
      }],
      ['v8_enable_shared_ro_heap==1', {
        'defines': ['V8_SHARED_RO_HEAP',],
      }],
      ['dcheck_always_on!=0', {
        'defines': ['DEBUG',],
      }],
      ['v8_enable_verify_csa==1', {
        'defines': ['ENABLE_VERIFY_CSA',],
      }],
      ['v8_use_perfetto==1', {
        'defines': ['V8_USE_PERFETTO',],
      }],
      ['v8_win64_unwinding_info==1', {
        'defines': ['V8_WIN64_UNWINDING_INFO',],
      }],
      ['v8_enable_regexp_interpreter_threaded_dispatch==1', {
        'defines': ['V8_ENABLE_REGEXP_INTERPRETER_THREADED_DISPATCH',],
      }],
      ['v8_enable_snapshot_compression==1', {
        'defines': ['V8_SNAPSHOT_COMPRESSION',],
      }],
      ['v8_control_flow_integrity==1', {
        'defines': ['V8_ENABLE_CONTROL_FLOW_INTEGRITY',],
      }],
      ['v8_enable_cet_shadow_stack==1', {
        'defines': ['V8_ENABLE_CET_SHADOW_STACK',],
      }],
      ['v8_enable_static_roots==1', {
        'defines': ['V8_STATIC_ROOTS',],
      }],
      ['v8_use_zlib==1', {
        'defines': ['V8_USE_ZLIB',],
      }],
      ['v8_enable_extensible_ro_snapshot==1', {
        'defines': ['V8_ENABLE_EXTENSIBLE_RO_SNAPSHOT',],
      }],
      ['v8_enable_precise_zone_stats==1', {
        'defines': ['V8_ENABLE_PRECISE_ZONE_STATS',],
      }],
      ['v8_enable_maglev==1', {
        'defines': ['V8_ENABLE_MAGLEV',],
      }],
      ['v8_enable_turbofan==1', {
        'defines': ['V8_ENABLE_TURBOFAN',],
      }],
      ['v8_enable_swiss_name_dictionary==1', {
        'defines': ['V8_ENABLE_SWISS_NAME_DICTIONARY',],
      }],
      ['v8_enable_system_instrumentation==1', {
        'defines': ['V8_ENABLE_SYSTEM_INSTRUMENTATION',],
      }],
      ['v8_enable_etw_stack_walking==1', {
        'defines': ['V8_ENABLE_ETW_STACK_WALKING',],
      }],
      ['v8_enable_webassembly==1', {
        'defines': ['V8_ENABLE_WEBASSEMBLY',],
      }],
      ['v8_dict_property_const_tracking==1', {
        'defines': ['V8_DICT_PROPERTY_CONST_TRACKING',],
      }],
      ['v8_enable_javascript_promise_hooks==1', {
        'defines': ['V8_ENABLE_JAVASCRIPT_PROMISE_HOOKS',],
      }],
      ['v8_enable_allocation_folding==1', {
        'defines': ['V8_ALLOCATION_FOLDING',],
      }],
      ['v8_allocation_site_tracking==1', {
        'defines': ['V8_ALLOCATION_SITE_TRACKING',],
      }],
      ['v8_scriptormodule_legacy_lifetime==1', {
        'defines': ['V8_SCRIPTORMODULE_LEGACY_LIFETIME',],
      }],
      ['v8_advanced_bigint_algorithms==1', {
        'defines': ['V8_ADVANCED_BIGINT_ALGORITHMS',],
      }],
    ],  # conditions
    'defines': [
      'V8_GYP_BUILD',
      'V8_TYPED_ARRAY_MAX_SIZE_IN_HEAP=<(v8_typed_array_max_size_in_heap)',
    ],  # defines
  },  # target_defaults
}