gecko-dev/js/moz.configure

# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.


@depends(build_project)
def js_standalone(build_project):
    if build_project == "js":
        return True


# Debug (see Bug 939505)
# ==============================================================
set_define("JS_DEBUG", True, when=moz_debug)


# Branding
# ==============================================================
option(
    "--with-app-name",
    env="MOZ_APP_NAME",
    nargs=1,
    help="Used for e.g. the binary program file name. If not set, "
    "defaults to a lowercase form of MOZ_APP_BASENAME",
)


@depends("--with-app-name", js_standalone, moz_app_basename)
def moz_app_name(value, js_standalone, moz_app_basename):
    if value:
        return value[0]
    if js_standalone:
        return "js"
    return moz_app_basename.lower()


set_config("MOZ_APP_NAME", moz_app_name)

# SmooshMonkey (new frontend)
# ==================================================

# Define here in order to use the option from bindgen.configure.
option(
    "--enable-smoosh",
    default=False,
    help="Enable SmooshMonkey (new JS engine frontend)",
)


@depends("--enable-smoosh")
def enable_smoosh(value):
    if value:
        return True


set_config("JS_ENABLE_SMOOSH", enable_smoosh)
set_define("JS_ENABLE_SMOOSH", enable_smoosh)

include("../build/moz.configure/nspr.configure", when="--enable-compile-environment")
include("../build/moz.configure/rust.configure", when="--enable-compile-environment")
include("../build/moz.configure/bindgen.configure", when="--enable-compile-environment")

set_config("JS_STANDALONE", js_standalone)
set_define("JS_STANDALONE", js_standalone)
add_old_configure_assignment("JS_STANDALONE", js_standalone)
option(
    "--enable-js-shell", default=js_standalone, help="{Build|Do not build} the JS shell"
)


@depends("--enable-js-shell")
def js_disable_shell(value):
    if not value:
        return True


set_config("JS_DISABLE_SHELL", js_disable_shell)

set_define("JS_64BIT", depends(target)(lambda t: t.bitness == 64 or None))

set_define("JS_PUNBOX64", depends(target)(lambda t: t.bitness == 64 or None))
set_define("JS_NUNBOX32", depends(target)(lambda t: t.bitness == 32 or None))


# SpiderMonkey as a shared library, and how its symbols are exported
# ==================================================================
option(
    "--disable-shared-js",
    when=js_standalone,
    help="{Create|Do not create} a shared library",
)

option(
    "--disable-export-js",
    when=js_standalone,
    help="{Mark|Do not mark} JS symbols as DLL exported/visible",
)


@depends("--disable-shared-js", "--disable-export-js", when=js_standalone)
def shared_js(shared_js, export_js):
    if shared_js:
        if not export_js:
            die("Must export JS symbols when building a shared library.")
        return True


set_config("JS_SHARED_LIBRARY", shared_js)


@depends(shared_js, "--disable-export-js", when=js_standalone)
def exportable_js_api(shared_js, export_js):
    if not shared_js and export_js:
        return True


set_define("STATIC_EXPORTABLE_JS_API", exportable_js_api)


@depends(shared_js, exportable_js_api)
def static_js_api(shared_js, export_js):
    if not shared_js and not export_js:
        return True


set_define("STATIC_JS_API", static_js_api)


@depends(shared_js)
def static_js(value):
    if not value:
        return True


set_define("MOZ_STATIC_JS", static_js)


# Enable records and tuples
# ===================================================
option(
    "--enable-record-tuple",
    default=False,
    help="Enable records and tuples (and disables JIT)",
)


@depends("--enable-record-tuple")
def enable_record_tuple(value):
    if value:
        return True


set_config("ENABLE_RECORD_TUPLE", enable_record_tuple)
set_define("ENABLE_RECORD_TUPLE", enable_record_tuple)

# Enable decorators
# ===================================================
option(
    "--enable-decorators",
    default=False,
    help="Enable experimental JS Decorators support",
)


@depends("--enable-decorators")
def enable_decorators(value):
    if value:
        return True


set_config("ENABLE_DECORATORS", enable_decorators)
set_define("ENABLE_DECORATORS", enable_decorators)

# Enable explicit resource management
# ===================================================
option(
    "--enable-explicit-resource-management",
    default=milestone.is_nightly,
    help="{Enable|Disable} explicit resource management",
)


@depends("--enable-explicit-resource-management")
def enable_explicit_resource_management(value):
    if value:
        return True


set_config("ENABLE_EXPLICIT_RESOURCE_MANAGEMENT", enable_explicit_resource_management)
set_define("ENABLE_EXPLICIT_RESOURCE_MANAGEMENT", enable_explicit_resource_management)


# Portable Baseline Intepreter
# =======================================================
option(
    "--enable-portable-baseline-interp",
    default=False,
    help="{Enable|Disable} the portable baseline interpreter",
)
set_define(
    "ENABLE_PORTABLE_BASELINE_INTERP",
    depends_if("--enable-portable-baseline-interp")(lambda _: True),
)
set_config(
    "ENABLE_PORTABLE_BASELINE_INTERP",
    depends_if("--enable-portable-baseline-interp")(lambda _: True),
)

# Option to always force PBL tier.
option(
    "--enable-portable-baseline-interp-force",
    default=False,
    help="{Enable|Disable} forcing use of the portable baseline interpreter",
)

set_define(
    "ENABLE_PORTABLE_BASELINE_INTERP_FORCE",
    depends_if("--enable-portable-baseline-interp-force")(lambda _: True),
)
set_config(
    "ENABLE_PORTABLE_BASELINE_INTERP_FORCE",
    depends_if("--enable-portable-baseline-interp-force")(lambda _: True),
)


# JIT support
# =======================================================
@depends(target, "--enable-record-tuple", "--enable-portable-baseline-interp")
def jit_default(target, enable_record_tuple, enable_portable_baseline_interp):
    if enable_record_tuple:
        return False
    if enable_portable_baseline_interp:
        return False
    if target.cpu in (
        "x86",
        "x86_64",
        "arm",
        "aarch64",
        "mips32",
        "mips64",
        "loongarch64",
    ):
        return True
    return False


option("--enable-jit", default=jit_default, help="{Enable|Disable} use of the JITs")


@deprecated_option("--enable-ion")
def report_deprecated(value):
    if value:
        die("--enable-ion is deprecated, use --enable-jit instead")
    else:
        die("--disable-ion is deprecated, use --disable-jit instead")


# JIT code simulator for cross compiles
# =======================================================
option(
    "--enable-simulator",
    choices=("arm", "arm64", "mips32", "mips64", "loong64", "riscv64"),
    nargs=1,
    help="Enable a JIT code simulator for the specified architecture",
)


@depends("--enable-jit", "--enable-simulator", target)
def simulator(jit_enabled, simulator_enabled, target):
    if not jit_enabled or not simulator_enabled:
        return

    sim_cpu = simulator_enabled[0]

    if sim_cpu in ("arm", "mips32"):
        if target.cpu != "x86":
            die("The %s simulator only works on x86." % sim_cpu)

    if sim_cpu in ("arm64", "mips64", "loong64", "riscv64"):
        if target.cpu != "x86_64" and target.cpu != "aarch64":
            die("The %s simulator only works on x86-64 or arm64." % sim_cpu)

    return namespace(**{sim_cpu: True})


set_config("JS_SIMULATOR", depends_if(simulator)(lambda x: True))
set_config("JS_SIMULATOR_ARM", simulator.arm)
set_config("JS_SIMULATOR_ARM64", simulator.arm64)
set_config("JS_SIMULATOR_MIPS32", simulator.mips32)
set_config("JS_SIMULATOR_MIPS64", simulator.mips64)
set_config("JS_SIMULATOR_LOONG64", simulator.loong64)
set_config("JS_SIMULATOR_RISCV64", simulator.riscv64)
set_define("JS_SIMULATOR", depends_if(simulator)(lambda x: True))
set_define("JS_SIMULATOR_ARM", simulator.arm)
set_define("JS_SIMULATOR_ARM64", simulator.arm64)
set_define("JS_SIMULATOR_MIPS32", simulator.mips32)
set_define("JS_SIMULATOR_MIPS64", simulator.mips64)
set_define("JS_SIMULATOR_LOONG64", simulator.loong64)
set_define("JS_SIMULATOR_RISCV64", simulator.riscv64)


@depends("--enable-jit", simulator, target)
def jit_codegen(jit_enabled, simulator, target):
    if not jit_enabled:
        return namespace(none=True)

    if simulator:
        return simulator

    if target.cpu == "aarch64":
        return namespace(arm64=True)
    elif target.cpu == "x86_64":
        return namespace(x64=True)
    elif target.cpu == "loongarch64":
        return namespace(loong64=True)
    elif target.cpu == "riscv64":
        return namespace(riscv64=True)

    return namespace(**{str(target.cpu): True})


set_config("JS_CODEGEN_NONE", jit_codegen.none)
set_config("JS_CODEGEN_ARM", jit_codegen.arm)
set_config("JS_CODEGEN_ARM64", jit_codegen.arm64)
set_config("JS_CODEGEN_MIPS32", jit_codegen.mips32)
set_config("JS_CODEGEN_MIPS64", jit_codegen.mips64)
set_config("JS_CODEGEN_LOONG64", jit_codegen.loong64)
set_config("JS_CODEGEN_RISCV64", jit_codegen.riscv64)
set_config("JS_CODEGEN_X86", jit_codegen.x86)
set_config("JS_CODEGEN_X64", jit_codegen.x64)
set_config("JS_CODEGEN_WASM32", jit_codegen.wasm32)

set_define("JS_CODEGEN_NONE", jit_codegen.none)
set_define("JS_CODEGEN_ARM", jit_codegen.arm)
set_define("JS_CODEGEN_ARM64", jit_codegen.arm64)
set_define("JS_CODEGEN_MIPS32", jit_codegen.mips32)
set_define("JS_CODEGEN_MIPS64", jit_codegen.mips64)
set_define("JS_CODEGEN_LOONG64", jit_codegen.loong64)
set_define("JS_CODEGEN_RISCV64", jit_codegen.riscv64)
set_define("JS_CODEGEN_X86", jit_codegen.x86)
set_define("JS_CODEGEN_X64", jit_codegen.x64)
set_define("JS_CODEGEN_WASM32", jit_codegen.wasm32)


# Profiling
# =======================================================
option(
    "--enable-instruments",
    env="MOZ_INSTRUMENTS",
    help="Enable instruments remote profiling",
)


@depends("--enable-instruments", target)
def instruments(value, target):
    if value and target.os != "OSX":
        die("--enable-instruments cannot be used when targeting %s", target.os)
    if value:
        return True


set_config("MOZ_INSTRUMENTS", instruments)
set_define("MOZ_INSTRUMENTS", instruments)

imply_option("--enable-profiling", instruments, reason="--enable-instruments")

option("--enable-callgrind", env="MOZ_CALLGRIND", help="Enable callgrind profiling")


@depends("--enable-callgrind")
def callgrind(value):
    if value:
        return True


set_define("MOZ_CALLGRIND", callgrind)
imply_option("--enable-profiling", callgrind)


@depends(milestone)
def enable_profiling(milestone):
    return milestone.is_nightly


option(
    "--enable-profiling",
    env="MOZ_PROFILING",
    default=enable_profiling,
    help="{Set|Do not set} compile flags necessary for using sampling "
    "profilers (e.g. shark, perf)",
)


@depends("--enable-profiling")
def profiling(value):
    if value:
        return True


with only_when("--enable-compile-environment"):
    imply_option("--enable-frame-pointers", True, when=profiling)


@depends(profiling, target)
def imply_vtune(value, target):
    ok_cpu = target.cpu in ["x86", "x86_64"]
    ok_kernel = target.kernel == "WINNT" or (
        target.kernel == "Linux" and target.os == "GNU"
    )

    if value and ok_cpu and ok_kernel:
        return True


set_config("MOZ_PROFILING", profiling)
set_define("MOZ_PROFILING", profiling)
imply_option("--enable-vtune", imply_vtune, reason="--enable-profiling")


@depends(milestone)
def enable_execution_tracing(milestone):
    return milestone.is_nightly


option(
    "--enable-execution-tracing",
    env="MOZ_EXECUTION_TRACING",
    default=enable_execution_tracing,
    help="{Set|Do not set} compile flags necessary for running the JS "
    "execution tracer",
)


@depends("--enable-execution-tracing")
def execution_tracing(value):
    if value:
        return True


set_config("MOZ_EXECUTION_TRACING", execution_tracing)
set_define("MOZ_EXECUTION_TRACING", execution_tracing)


option("--enable-vtune", env="MOZ_VTUNE", help="Enable VTune profiling")


@depends("--enable-vtune")
def vtune(value):
    if value:
        return True


set_config("MOZ_VTUNE", vtune)
set_define("MOZ_VTUNE", vtune)


option(
    "--enable-gc-probes",
    env="JS_GC_PROBES",
    help="Turn on probes for allocation and finalization",
)


@depends("--enable-gc-probes")
def gc_probes(value):
    if value:
        return True


set_define("JS_GC_PROBES", gc_probes)


option(
    "--enable-gczeal",
    default=depends(when=moz_debug)(lambda: True),
    help="{Enable|Disable} zealous GCing",
)

set_define("JS_GC_ZEAL", depends_if("--enable-gczeal")(lambda _: True))


# Enable breakpoint for artificial OOMs
# =======================================================
option(
    "--enable-oom-breakpoint", help="Enable a breakpoint function for artificial OOMs"
)

set_define("JS_OOM_BREAKPOINT", depends_if("--enable-oom-breakpoint")(lambda _: True))


# Enable perf jitdump integration for nightly.
# The following must be true for jitdump to be enabled:
#   (a) --disable-jitdump was not provided.
#   (b) target is Linux or Mac
#   (c) milestone is a nightly build
# =======================================================
option(
    "--enable-jitdump",
    default=milestone.is_nightly,
    help="{Enable|Disable} perf jitdump integration",
)


@depends("--enable-jitdump", target)
def ion_perf(enable_jitdump, target):
    is_linux_or_mac = target.kernel == "Linux" or (
        target.kernel == "Darwin" and target.os == "OSX"
    )
    if enable_jitdump and is_linux_or_mac:
        return True


set_define("JS_ION_PERF", ion_perf)


option(
    "--enable-jitspew",
    default=depends(when=moz_debug)(lambda: True),
    help="{Enable|Disable} the Jit spew and IONFLAGS environment " "variable",
)

set_define("JS_JITSPEW", depends_if("--enable-jitspew")(lambda _: True))
set_config("JS_JITSPEW", depends_if("--enable-jitspew")(lambda _: True))

# Also enable the structured spewer
set_define("JS_STRUCTURED_SPEW", depends_if("--enable-jitspew")(lambda _: True))
set_config("JS_STRUCTURED_SPEW", depends_if("--enable-jitspew")(lambda _: True))


@depends("--enable-jit", "--enable-jitspew", simulator, target, moz_debug)
def jit_disasm_arm(jit_enabled, spew, simulator, target, debug):
    if not jit_enabled:
        return

    if simulator and (debug or spew):
        if getattr(simulator, "arm", None):
            return True

    if target.cpu == "arm" and (debug or spew):
        return True


set_config("JS_DISASM_ARM", jit_disasm_arm)
set_define("JS_DISASM_ARM", jit_disasm_arm)


@depends("--enable-jit", "--enable-jitspew", simulator, target, moz_debug)
def jit_disasm_riscv(jit_enabled, spew, simulator, target, debug):
    if not jit_enabled:
        return

    if simulator and (debug or spew):
        if getattr(simulator, "riscv64", None):
            return True

    if target.cpu == "riscv64" and (debug or spew):
        return True


set_config("JS_DISASM_RISCV64", jit_disasm_riscv)
set_define("JS_DISASM_RISCV64", jit_disasm_riscv)


@depends("--enable-jit", "--enable-jitspew", simulator, target, moz_debug)
def jit_disasm_arm64(jit_enabled, spew, simulator, target, debug):
    if not jit_enabled:
        return

    if simulator and (debug or spew):
        if getattr(simulator, "arm64", None):
            return True

    if target.cpu == "aarch64" and (debug or spew):
        return True


set_config("JS_DISASM_ARM64", jit_disasm_arm64)
set_define("JS_DISASM_ARM64", jit_disasm_arm64)

# When enabled, masm will generate assumeUnreachable calls that act as
# assertions in the generated code. This option is worth disabling when you
# have to track mutated values through the generated code, to avoid constantly
# dumping registers on and off the stack.
option(
    "--enable-masm-verbose",
    default=depends(when=moz_debug)(lambda: True),
    help="{Enable|Disable} MacroAssembler verbosity of generated code",
)
set_define("JS_MASM_VERBOSE", depends_if("--enable-masm-verbose")(lambda _: True))
set_config("JS_MASM_VERBOSE", depends_if("--enable-masm-verbose")(lambda _: True))

# Architecture feature flags
# =======================================================


# Apple silicon does not seem to have any way to query the OS for the JSCVT
# flag stored in the ID_AA64ISAR1_EL1 system register. In the mean time, we
# hard code the value of the JSCVT flag which guards the implementation of
# FJCVTZS instruction as part of ARMv8.3-JSConv.
@depends(target)
def is_apple_silicon(target):
    return target.kernel == "Darwin" and target.cpu == "aarch64"


option(
    "--enable-arm64-fjcvtzs",
    default=is_apple_silicon,
    help="{Enable|Disable} static use of FJCVTZS instruction on Aarch64 targets",
)


# The "ARM Architecture Reference Manual" for ARMv8 defines the JSCVT flag as
# being a 4 bit integer (D12.2.52) and it can be manipulated using >= operator
# (D12.1.4).
#
# The FJCVTZS instruction is implemented if ID_AA64ISAR1_EL1.JSCVT >= 1.
@depends("--enable-arm64-fjcvtzs", target, simulator)
def aarch64_jscvt(fjcvtzs, target, simulator):
    if target.cpu == "aarch64" and fjcvtzs:
        return 1

    if simulator and getattr(simulator, "arm64", False) and fjcvtzs:
        return 1

    return 0


set_define("MOZ_AARCH64_JSCVT", aarch64_jscvt)


@depends(target)
def has_apple_fast_wx(target):
    return target.kernel == "Darwin" and target.cpu == "aarch64"


# On Apple Silicon macOS we use MAP_JIT with pthread_jit_write_protect_np to
# implement JIT code write protection, while on iOS we use MAP_JIT with
# be_memory_inline_jit_restrict_*.
set_define("JS_USE_APPLE_FAST_WX", True, when=has_apple_fast_wx)


# CTypes
# =======================================================
@depends(js_standalone)
def ctypes_default(js_standalone):
    return not js_standalone


option("--enable-ctypes", default=ctypes_default, help="{Enable|Disable} js-ctypes")

build_ctypes = depends_if("--enable-ctypes")(lambda _: True)

set_config("BUILD_CTYPES", build_ctypes)
set_define("BUILD_CTYPES", build_ctypes)

set_config("JS_HAS_CTYPES", build_ctypes)
set_define("JS_HAS_CTYPES", build_ctypes)


@depends("--enable-ctypes", "--enable-compile-environment")
def ctypes_and_compile_environment(ctypes, compile_environment):
    return ctypes and compile_environment


include("ffi.configure", when=ctypes_and_compile_environment)


# Enable pipeline operator
# ===================================================
option("--enable-pipeline-operator", default=False, help="Enable pipeline operator")


@depends("--enable-pipeline-operator")
def enable_pipeline_operator(value):
    if value:
        return True


set_config("ENABLE_PIPELINE_OPERATOR", enable_pipeline_operator)
set_define("ENABLE_PIPELINE_OPERATOR", enable_pipeline_operator)


# SIMD acceleration for encoding_rs
# ==============================================================

option(
    "--enable-rust-simd", env="MOZ_RUST_SIMD", help="Enable explicit SIMD in Rust code"
)


@depends("--enable-rust-simd", target)
def rust_simd(value, target):
    # As of 2019-09-17, the simd-accel feature of encoding_rs has not
    # been properly set up outside aarch64, armv7, x86 and x86_64.
    if target.cpu in ("aarch64", "arm", "x86", "x86_64") and value:
        return True


set_config("MOZ_RUST_SIMD", rust_simd)
set_define("MOZ_RUST_SIMD", rust_simd)

# Telemetry to measure compile time and generated-code runtime
# ============================================================

option(
    "--enable-spidermonkey-telemetry",
    default=milestone.is_nightly,
    help="{Enable|Disable} performance telemetry for SpiderMonkey (e.g. compile and run times)",
)

set_define(
    "ENABLE_SPIDERMONKEY_TELEMETRY",
    depends_if("--enable-spidermonkey-telemetry")(lambda x: True),
)

# Support for debugging code generated by wasm backends
# =====================================================

option(
    "--enable-wasm-codegen-debug",
    default=depends(when=moz_debug)(lambda: True),
    help="{Enable|Disable} debugging for wasm codegen",
)

set_config(
    "WASM_CODEGEN_DEBUG", depends_if("--enable-wasm-codegen-debug")(lambda x: True)
)
set_define(
    "WASM_CODEGEN_DEBUG", depends_if("--enable-wasm-codegen-debug")(lambda x: True)
)

# WebAssembly feature flags
# ==================================================

option(
    "--wasm-no-experimental",
    default=False,
    help="Force disable all wasm experimental features for testing",
)


# Support for JS PI spec.
# ===========================


@depends(
    milestone.is_nightly,
    "--enable-jit",
    "--enable-simulator",
    target,
)
def default_wasm_jspi(
    is_nightly,
    jit_enabled,
    simulator,
    target,
):
    if not jit_enabled:
        return

    if not is_nightly:
        return

    if simulator:
        return simulator[0] == "arm64" or simulator[0] == "arm"

    if target.cpu in ("x86_64", "x86", "aarch64", "arm", "loongarch64"):
        return True


option(
    "--enable-wasm-jspi",
    default=default_wasm_jspi,
    help="{Enable|Disable} WebAssembly JS PI",
)


@depends(
    "--enable-wasm-jspi",
    "--enable-jit",
    "--enable-simulator",
    "--wasm-no-experimental",
    target,
)
def wasm_jspi(value, jit_enabled, simulator, no_experimental, target):
    if no_experimental or not value:
        return

    if not jit_enabled:
        die("--enable-wasm-jspi requires --enable-jit")

    if simulator and not (simulator[0] == "arm64" or simulator[0] == "arm"):
        die("--enable-wasm-jspi is only supported for arm64/arm simulators")

    if target.cpu in ("x86_64", "x86", "aarch64", "arm", "loongarch64"):
        return True

    die(
        "--enable-wasm-jspi only possible when targeting the x86_64/x86/arm64/arm/loongarch64 jits"
    )


set_config("ENABLE_WASM_JSPI", wasm_jspi)
set_define("ENABLE_WASM_JSPI", wasm_jspi)

# Support for WebAssembly JS String Builtins
# ==========================================


option(
    "--disable-wasm-js-string-builtins",
    default=True,
    help="{Enable|Disable} WebAssembly JS String Builtins",
)


@depends("--disable-wasm-js-string-builtins")
def wasm_js_string_builtins(value):
    if not value:
        return

    return True


set_config("ENABLE_WASM_JS_STRING_BUILTINS", wasm_js_string_builtins)
set_define("ENABLE_WASM_JS_STRING_BUILTINS", wasm_js_string_builtins)

# Support for WebAssembly shared memory and atomics.
#
# This affects the JS shell only.
# =====================================================

option(
    "--disable-shared-memory", help="Disable JS/WebAssembly shared memory and atomics"
)


@depends("--disable-shared-memory")
def enable_shared_memory(value):
    if value:
        return True


set_config("ENABLE_SHARED_MEMORY", enable_shared_memory)
set_define("ENABLE_SHARED_MEMORY", enable_shared_memory)

# Support for WebAssembly SIMD
# =====================================================


@depends("--enable-jit", "--enable-simulator", target)
def default_wasm_simd(jit_enabled, simulator, target):
    if not jit_enabled:
        return

    if simulator and (simulator[0] != "arm64"):
        return

    if target.cpu in ("x86_64", "x86", "aarch64"):
        return True


option(
    "--enable-wasm-simd",
    default=default_wasm_simd,
    help="{Enable|Disable} WebAssembly SIMD",
)


@depends(
    "--enable-wasm-simd",
    "--enable-jit",
    "--enable-simulator",
    target,
    "--wasm-no-experimental",
)
def wasm_simd(value, jit_enabled, simulator, target, no_experimental):
    if no_experimental or not value:
        return

    if not jit_enabled:
        die("--enable-wasm-simd requires --enable-jit")

    if simulator and (simulator[0] != "arm64"):
        die("--enable-wasm-simd is not supported for simulators, except arm64")

    if target.cpu in ("x86_64", "x86", "aarch64"):
        return True

    die("--enable-wasm-simd only possible when targeting the x86_64/x86/arm64 jits")


set_config("ENABLE_WASM_SIMD", wasm_simd)
set_define("ENABLE_WASM_SIMD", wasm_simd)

# Whether to check for field changes in WebAssembly serialization
#
# See the comment for 'WASM_VERIFY_SERIALIZATION_FOR_SIZE' in WasmSerialize.cpp
# for more background.
# =====================================================================


@depends(
    target,
    c_compiler,
    moz_debug,
    milestone,
    "--wasm-no-experimental",
)
def wasm_verify_serialization_for_size(
    target, c_compiler, debug, milestone, no_experimental
):
    if (
        debug == True
        and target.kernel == "Linux"
        and target.cpu == "x86_64"
        and c_compiler
        and c_compiler.type == "clang"
        and milestone.is_nightly
        and not no_experimental
    ):
        return True
    return


set_define(
    "ENABLE_WASM_VERIFY_SERIALIZATION_FOR_SIZE", wasm_verify_serialization_for_size
)

# Support for Intel AVX instruction.
#
# AVX is exclusively used in WebAssembly SIMD instructions at the moment:
# set direct dependency on "--enable-wasm-simd".
# =====================================================


@depends("--enable-wasm-simd", "--enable-simulator", target)
def default_wasm_avx(wasm_simd_enabled, simulator, target):
    if not wasm_simd_enabled:
        return

    if simulator:
        return

    if target.cpu in ("x86_64", "x86"):
        return True


option(
    "--enable-wasm-avx",
    default=default_wasm_avx,
    help="{Enable|Disable} AVX support for WebAssembly SIMD",
)


@depends(
    "--enable-wasm-avx",
    "--enable-wasm-simd",
    "--enable-simulator",
    target,
    "--wasm-no-experimental",
)
def wasm_avx(value, wasm_simd_enabled, simulator, target, no_experimental):
    if no_experimental or not value:
        return

    if not wasm_simd_enabled:
        die("--enable-wasm-avx requires --enable-wasm-simd")

    if simulator:
        die("--enable-wasm-avx is not supported for simulators")

    if target.cpu in ("x86_64", "x86"):
        return True

    die("--enable-wasm-avx only possible when targeting the x86_64/x86 jits")


set_config("ENABLE_WASM_AVX", wasm_avx)
set_define("ENABLE_WASM_AVX", wasm_avx)

# Support for WebAssembly relaxed SIMD
# =====================================================


@depends(milestone.is_nightly, "--enable-wasm-simd")
def default_wasm_relaxed_simd(is_nightly, wasm_simd):
    if is_nightly and wasm_simd:
        return True


option(
    "--enable-wasm-relaxed-simd",
    default=default_wasm_relaxed_simd,
    help="{Enable|Disable} WebAssembly relaxed SIMD",
)


@depends("--enable-wasm-relaxed-simd", "--enable-wasm-simd", "--wasm-no-experimental")
def wasm_relaxed_simd(value, wasm_simd, no_experimental):
    if no_experimental or not value:
        return

    if not wasm_simd:
        die("relaxed SIMD requires SIMD")

    return True


set_config("ENABLE_WASM_RELAXED_SIMD", wasm_relaxed_simd)
set_define("ENABLE_WASM_RELAXED_SIMD", wasm_relaxed_simd)

# Support for WebAssembly intgemm private intrinsics
# =====================================================


@depends(target)
def default_wasm_moz_intgemm(target):
    return target.cpu in ("x86", "x86_64", "aarch64")


option(
    "--enable-wasm-moz-intgemm",
    default=default_wasm_moz_intgemm,
    help="{Enable|Disable} WebAssembly intgemm private intrinsics",
)


@depends("--enable-wasm-moz-intgemm", "--wasm-no-experimental")
def wasm_moz_intgemm(value, no_experimental):
    if no_experimental:
        return

    if value:
        return True


set_config("ENABLE_WASM_MOZ_INTGEMM", wasm_moz_intgemm)
set_define("ENABLE_WASM_MOZ_INTGEMM", wasm_moz_intgemm)

# Support for WebAssembly Memory64.
# ===========================


@depends("--enable-simulator", target)
def default_wasm_memory64(simulator, target):
    if target.cpu == "mips32":
        return

    if simulator and simulator[0] == "mips32":
        return

    return True


option(
    "--enable-wasm-memory64",
    default=default_wasm_memory64,
    help="{Enable|Disable} WebAssembly Memory64",
)


@depends("--enable-wasm-memory64", "--enable-simulator", target)
def wasm_memory64(value, simulator, target):
    if not value:
        return

    if target.cpu == "mips32":
        die("Memory64 is incompatible with MIPS32 target")

    if simulator and simulator[0] == "mips32":
        die("Memory64 is incompatible with MIPS32 simulator")

    return True


set_config("ENABLE_WASM_MEMORY64", wasm_memory64)
set_define("ENABLE_WASM_MEMORY64", wasm_memory64)


# Support for WebAssembly memory control.
# ===========================


@depends(milestone.is_nightly)
def default_wasm_memory_control(is_nightly):
    if is_nightly:
        return True


option(
    "--enable-wasm-memory-control",
    default=default_wasm_memory_control,
    help="{Enable|Disable} WebAssembly fine-grained memory control instructions",
)


@depends("--enable-wasm-memory-control", "--wasm-no-experimental")
def wasm_memory_control(value, no_experimental):
    if no_experimental or not value:
        return

    return True


set_config("ENABLE_WASM_MEMORY_CONTROL", wasm_memory_control)
set_define("ENABLE_WASM_MEMORY_CONTROL", wasm_memory_control)


# Support for WebAssembly Multi Memory.
# =====================================


option(
    "--disable-wasm-multi-memory",
    help="{Enable|Disable} WebAssembly multi-memory",
)


@depends("--disable-wasm-multi-memory")
def wasm_multi_memory(value):
    if value:
        return True


set_config("ENABLE_WASM_MULTI_MEMORY", wasm_multi_memory)
set_define("ENABLE_WASM_MULTI_MEMORY", wasm_multi_memory)


# Support for WebAssembly Branch-hinting.
# ===========================


@depends(milestone.is_nightly)
def default_wasm_branch_hinting(is_nightly):
    if is_nightly:
        return True


option(
    "--enable-wasm-branch-hinting",
    default=default_wasm_branch_hinting,
    help="{Enable|Disable} WebAssembly Branch hints",
)


@depends("--enable-wasm-branch-hinting", "--wasm-no-experimental")
def wasm_branch_hinting(value, no_experimental):
    if no_experimental or not value:
        return

    return True


set_config("ENABLE_WASM_BRANCH_HINTING", wasm_branch_hinting)
set_define("ENABLE_WASM_BRANCH_HINTING", wasm_branch_hinting)

# Options for generating the shell as a script
# ============================================
option("--with-qemu-exe", nargs=1, help="Use path as an arm emulator on host platforms")
set_config("QEMU_EXE", depends_if("--with-qemu-exe")(lambda x: x))

option(
    "--with-cross-lib",
    nargs=1,
    default=depends(target.alias)(lambda x: "/usr/%s" % x),
    help="Use dir as the location for arm libraries",
)
set_config("CROSS_LIB", depends_if("--with-cross-lib")(lambda x: x))

# Enable static checking using sixgill
# ====================================

option("--with-sixgill", nargs=1, help="Enable static checking of code using sixgill")


@depends_if("--with-sixgill")
@imports("os")
def sixgill(value):
    for f in ("bin/xdbfind", "gcc/xgill.so", "scripts/wrap_gcc/g++"):
        if not os.path.exists(os.path.join(value[0], f)):
            die("The sixgill plugin and binaries are not at the specified path")
    return value[0]


set_config("SIXGILL_PATH", sixgill)


# Support for readline
# =====================================================


@depends("--enable-js-shell", target_is_windows, compile_environment, target)
def editline(js_shell, is_windows, compile_environment, target):
    return js_shell and not is_windows and compile_environment and (target.os != "WASI")


option(
    "--enable-readline", help="Link js shell to system readline library", when=editline
)

has_readline = check_symbol(
    "readline",
    flags=["-lreadline"],
    when="--enable-readline",
    onerror=lambda: die("No system readline library found"),
)

set_config("EDITLINE_LIBS", ["-lreadline"], when=has_readline)


@depends("--enable-readline", editline, when=editline)
def bundled_editline(readline, editline):
    return editline and not readline


set_config("JS_BUNDLED_EDITLINE", bundled_editline)

set_define("EDITLINE", True, when=editline)


# JIT observers
# =============

option(
    "--with-jitreport-granularity",
    default="3",
    choices=("0", "1", "2", "3"),
    help="Default granularity at which to report JIT code to external tools "
    "(0 - no info, 1 - code ranges for while functions only, "
    "2 - per-line information, 3 - per-op information)",
)

set_define(
    "JS_DEFAULT_JITREPORT_GRANULARITY",
    depends_if("--with-jitreport-granularity")(lambda value: value[0]),
)


# ECMAScript Internationalization API Support (uses ICU)
# ======================================================
system_lib_option(
    "--with-system-icu",
    help="Use system ICU",
    when=use_pkg_config,
)


@depends("--with-system-icu", when=use_pkg_config)
def enable_system_icu_option(enable_system_icu):
    return enable_system_icu


system_icu = pkg_check_modules("MOZ_ICU", "icu-i18n >= 73.1", when="--with-system-icu")


@depends(enable_system_icu_option)
def in_tree_icu(system_icu):
    return not system_icu


# Set MOZ_ICU_CFLAGS to an explicit empty value when --with-system-icu is *not* used,
# for layout/style/extra-bindgen-flags
set_config("MOZ_ICU_CFLAGS", [], when=in_tree_icu)

set_config("MOZ_SYSTEM_ICU", True, when=system_icu)
set_define("MOZ_SYSTEM_ICU", True, when=system_icu)

option("--disable-icu4x", help="Disable using ICU4X")


@depends("--enable-icu4x", js_standalone)
def check_icu4x(enabled, js_standalone):
    if not enabled and not js_standalone:
        die("--disable-icu4x is not supported")


set_config("MOZ_ICU4X", True, when="--enable-icu4x")
set_define("MOZ_ICU4X", True, when="--enable-icu4x")

option("--without-intl-api", help="Disable ECMAScript Internationalization API")


@depends("--with-intl-api", js_standalone)
def check_intl_api(enabled, js_standalone):
    if not enabled and not js_standalone:
        die("--without-intl-api is not supported")


set_config("JS_HAS_INTL_API", True, when="--with-intl-api")
set_define("JS_HAS_INTL_API", True, when="--with-intl-api")


@depends(build_environment, when="--with-intl-api")
@imports(_from="__builtin__", _import="open")
@imports(_from="__builtin__", _import="ValueError")
def icu_version(build_env):
    path = os.path.join(
        build_env.topsrcdir, "intl", "icu", "source", "common", "unicode", "uvernum.h"
    )
    with open(path, encoding="utf-8") as fh:
        for line in fh:
            if line.startswith("#define"):
                define = line.split(None, 3)
                if len(define) == 3 and define[1] == "U_ICU_VERSION_MAJOR_NUM":
                    try:
                        return str(int(define[2]))
                    except ValueError:
                        pass
    die("Cannot determine ICU version number from uvernum.h header file")


set_config("MOZ_ICU_VERSION", icu_version)

# Source files that use ICU should have control over which parts of the ICU
# namespace they want to use.
set_define("U_USING_ICU_NAMESPACE", "0", when="--with-intl-api")

# We build ICU as a static library.
set_define("U_STATIC_IMPLEMENTATION", True, when=depends(system_icu)(lambda x: not x))


# ECMAScript Temporal API Support (uses ICU and ICU4X)
# ======================================================

option("--with-temporal-api", default=False, help="Enable ECMAScript Temporal API")

set_config("JS_HAS_TEMPORAL_API", True, when="--with-temporal-api")
set_define("JS_HAS_TEMPORAL_API", True, when="--with-temporal-api")


@depends("--with-temporal-api", "--with-intl-api", "--enable-icu4x")
def check_temporal_api(temporal_enabled, intl_enabled, icu4x_enabled):
    if temporal_enabled and not (intl_enabled and icu4x_enabled):
        die("Can't use --with-temporal-api with --without-intl-api or --disable-icu4x")


# Initial support for WebAssembly JS-API Type Reflections
# =======================================================


@depends(milestone.is_nightly)
def default_wasm_type_reflections(is_nightly):
    return is_nightly


option(
    "--enable-wasm-type-reflections",
    default=default_wasm_type_reflections,
    help="{Enable|Disable} type reflection in WASM JS-API",
)

set_config(
    "ENABLE_WASM_TYPE_REFLECTIONS",
    depends_if("--enable-wasm-type-reflections")(lambda x: True),
)
set_define(
    "ENABLE_WASM_TYPE_REFLECTIONS",
    depends_if("--enable-wasm-type-reflections")(lambda x: True),
)

# Wasi configuration
# ===================================================


@depends(target.os)
def is_wasi_target(os):
    return os == "WASI"


set_define("_WASI_EMULATED_PROCESS_CLOCKS", True, when=is_wasi_target)
set_define("_WASI_EMULATED_GETPID", True, when=is_wasi_target)


@depends(milestone.version)
def js_version(version):
    return Version(version)


set_config("MOZJS_MAJOR_VERSION", depends(js_version.major)(lambda m: str(m)))
set_define("MOZJS_MAJOR_VERSION", js_version.major)
set_config("MOZJS_MINOR_VERSION", depends(js_version.minor)(lambda m: str(m)))
set_define("MOZJS_MINOR_VERSION", js_version.minor)
set_config("MOZJS_PATCH_VERSION", depends(js_version.patch)(lambda p: str(p)))
set_config(
    "MOZJS_ALPHA",
    depends(js_version)(
        lambda x: x.version[-2] if str(x.version[-2]) in "ab" else None
    ),
)

# Some platforms have HeapReg, some don't
# =====================================================

# The ARM simulator runs on x86 and might be excluded by the first test,
# so we special-case it.


@depends("--enable-simulator", target)
def wasm_has_heapreg(simulator, target):
    if target.cpu != "x86":
        return True

    if simulator and simulator[0] == "arm":
        return True


set_define("WASM_HAS_HEAPREG", wasm_has_heapreg)

# Check for tm_zone, tm_gmtoff in struct tm
# ===================================================
with only_when(compile_environment):
    set_define(
        "HAVE_TM_ZONE_TM_GMTOFF",
        c_compiler.try_compile(
            includes=["time.h"],
            body="struct tm tm; tm.tm_zone = 0; tm.tm_gmtoff = 1;",
            check_msg="for tm_zone and tm_gmtoff in struct tm",
        ),
    )


# Optimization flags
# ==============================================================
@depends(
    target,
    c_compiler,
    configured_moz_optimize_flags,
    when="--enable-compile-environment",
)
@imports(_from="mozbuild.shellutil", _import="split")
def moz_js_optimize_flags(target, compiler, configured_moz_optimize_flags):
    if configured_moz_optimize_flags:
        return configured_moz_optimize_flags

    if target.kernel in ("Darwin", "Linux"):
        flags = ["-O3"]
        if target.os == "Android" and compiler.type == "gcc":
            flags += ["-fno-reorder-functions"]
        return flags
    elif target.kernel == "WINNT":
        return ["-O2"]
    else:
        return ["-O"]


set_config("MOZ_JS_OPTIMIZE_FLAGS", moz_js_optimize_flags, when=~js_build)
set_config("MOZ_OPTIMIZE_FLAGS", moz_js_optimize_flags, when=js_build)


# link executables against mozglue
# ==============================================================
@depends(
    target_is_android | target_is_windows | target_is_darwin,
    js_standalone & ~depends(when="--enable-jemalloc")(True),
)
def moz_glue_in_program(is_excluded_target, is_js_without_jemalloc):
    return not is_excluded_target and not is_js_without_jemalloc


set_define("MOZ_GLUE_IN_PROGRAM", True, when=moz_glue_in_program)
set_config("MOZ_GLUE_IN_PROGRAM", True, when=moz_glue_in_program)


# JavaScript shell
# ==============================================================
@depends(milestone.symbolversion, js_standalone)
def js_library_name(symbolversion, js_standalone):
    if js_standalone:
        return f"mozjs-{symbolversion}"
    else:
        return "mozjs"


set_config("JS_LIBRARY_NAME", js_library_name)


@depends(nspr_config.libs, nspr_pkg.libs, instruments)
def js_config_libs(nspr_libs, nspr_pkg_libs, instruments):
    libs = []
    if nspr_libs:
        libs += nspr_libs
    if nspr_pkg_libs:
        libs += nspr_pkg_libs
    if instruments:
        libs += ["-framework", "CoreFoundation"]
    return libs


set_config("JS_CONFIG_LIBS", js_config_libs)


@depends(js_library_name, c_compiler, "--libdir", when=compile_environment)
def js_config_moz_js_libs(js_library_name, compiler, libdir):
    if compiler.type == "clang-cl":
        return [f"{libdir[0]}/{js_library_name}.lib"]
    else:
        return [f"-L{libdir[0]}", f"-l{js_library_name}"]


set_config("JS_CONFIG_MOZ_JS_LIBS", js_config_moz_js_libs)

#
# Checks for library functions
# ==============================================================
with only_when(compile_environment & depends(target.os)(lambda os: os != "WINNT")):
    set_define("HAVE_GETPAGESIZE", check_symbol("getpagesize"))
    set_define("HAVE_GMTIME_R", check_symbol("gmtime_r"))
    set_define("HAVE_LOCALTIME_R", check_symbol("localtime_r"))
    set_define("HAVE_GETTID", check_symbol("gettid"))
    set_define("HAVE_SETPRIORITY", check_symbol("setpriority"))
    set_define("HAVE_SYSCALL", check_symbol("syscall"))
    set_define("HAVE_GETC_UNLOCKED", check_symbol("getc_unlocked"))
    set_define("HAVE_PTHREAD_GETNAME_NP", check_symbol("pthread_getname_np"))
    set_define("HAVE_PTHREAD_GET_NAME_NP", check_symbol("pthread_get_name_np"))
    set_define("HAVE_STRERROR", check_symbol("strerror"))

    set_config(
        "HAVE_LANGINFO_CODESET",
        try_link(
            includes=["langinfo.h"],
            body="char* cs = nl_langinfo(CODESET);",
            check_msg="for nl_langinfo and CODESET",
            when=building_with_gnu_compatible_cc,
        ),
    )

    @depends(check_symbol("__cxa_demangle", language="C++"), moz_debug, dmd)
    def demangle_symbols(cxa_demangle, moz_debug, dmd):
        # Demangle only for debug or DMD builds
        if cxa_demangle and (moz_debug or dmd):
            return True

    set_define("MOZ_DEMANGLE_SYMBOLS", demangle_symbols)

    set_define("HAVE__UNWIND_BACKTRACE", True, when=have_unwind)

with only_when(compile_environment):
    set_define("HAVE__GETC_NOLOCK", check_symbol("_getc_nolock"))
    set_define("HAVE_LOCALECONV", check_symbol("localeconv"))