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


# 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)
add_old_configure_assignment("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)


option(env="NO_RUST_PANIC_HOOK", when=js_standalone, help="Disable rust panic hook")

set_define("NO_RUST_PANIC_HOOK", True, when="NO_RUST_PANIC_HOOK")


# JIT support
# =======================================================
@depends(target)
def jit_default(target):
    if target.cpu in ("x86", "x86_64", "arm", "aarch64", "mips32", "mips64"):
        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"),
    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"):
        if target.cpu != "x86_64":
            die("The %s simulator only works on x86-64." % 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_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)


@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)

    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_X86", jit_codegen.x86)
set_config("JS_CODEGEN_X64", jit_codegen.x64)
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_X86", jit_codegen.x86)
set_define("JS_CODEGEN_X64", jit_codegen.x64)

# 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)
add_old_configure_assignment("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


add_old_configure_assignment("MOZ_PROFILING", profiling)

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")


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))


# Use a smaller chunk size for GC chunks
# ========================================================
# Use large (1MB) chunks by default.  This option can be used to give
# smaller (currently 256K) chunks.
option(
    "--enable-small-chunk-size",
    help="Allocate memory for JS GC things in smaller chunks",
)

set_define(
    "JS_GC_SMALL_CHUNK_SIZE", depends(when="--enable-small-chunk-size")(lambda: True)
)


# Trace logging.
# =======================================================
@depends(milestone)
def default_trace_logging(milestone):
    return milestone.is_nightly


option(
    "--enable-trace-logging",
    default=default_trace_logging,
    help="{Enable|Disable} trace logging",
)

set_config("ENABLE_TRACE_LOGGING", depends_if("--enable-trace-logging")(lambda x: True))
set_define("JS_TRACE_LOGGING", depends_if("--enable-trace-logging")(lambda x: 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))


option("--enable-perf", env="JS_ION_PERF", help="Enable Linux perf integration")


@depends("--enable-perf")
def ion_perf(value):
    if value:
        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_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.os == "OSX" and 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)

# 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)


# Support for wasm code generation with Cranelift
# ==============================================================

option(
    "--enable-cranelift",
    default=False,
    help="{Enable|Disable} Cranelift code generator for wasm",
)


@depends(
    "--enable-cranelift",
    "--enable-jit",
    "--enable-simulator",
    target,
    target_is_windows,
)
def enable_cranelift(value, jit_enabled, simulator, target, is_windows):
    if not value:
        return

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

    if not (
        target.cpu == "aarch64"
        or (target.cpu == "x86_64" and simulator and simulator[0] == "arm64")
    ):
        die("--enable-cranelift is only supported on arm64")

    if is_windows:
        die("--enable-cranelift is not supported on windows")

    return True


set_config("ENABLE_WASM_CRANELIFT", enable_cranelift)
set_define("ENABLE_WASM_CRANELIFT", enable_cranelift)


# 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)
)

# Support for WebAssembly function-references.
# ===========================


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


option(
    "--enable-wasm-function-references",
    default=default_wasm_function_references,
    help="{Enable|Disable} WebAssembly function-references",
)


@depends("--enable-wasm-function-references")
def wasm_function_references(value):
    if value:
        return True


set_config("ENABLE_WASM_FUNCTION_REFERENCES", wasm_function_references)
set_define("ENABLE_WASM_FUNCTION_REFERENCES", wasm_function_references)

# Support for WebAssembly GC.
# ===========================


@depends(milestone.is_nightly, "--enable-wasm-function-references")
def default_wasm_gc(is_nightly, function_references):
    if is_nightly and function_references:
        return True


option(
    "--enable-wasm-gc", default=default_wasm_gc, help="{Enable|Disable} WebAssembly GC"
)


@depends("--enable-wasm-gc", "--enable-wasm-function-references")
def wasm_gc(value, function_references):
    if not value:
        return

    if function_references:
        return True

    die("--enable-wasm-gc only possible with --enable-wasm-function-references")


set_config("ENABLE_WASM_GC", wasm_gc)
set_define("ENABLE_WASM_GC", wasm_gc)


# Support for WebAssembly private ref types.
# Prevent (ref T) types from being exposed to JS content so that wasm need do
# no typechecking at the JS/wasm boundary
# ===========================================================================


@depends(milestone.is_nightly, "--enable-wasm-gc")
def default_wasm_private_reftypes(is_nightly, gc):
    if gc and is_nightly:
        return True


option(
    "--enable-wasm-private-reftypes",
    default=default_wasm_private_reftypes,
    help="{Enable|Disable} WebAssembly private reference types",
)

set_config(
    "WASM_PRIVATE_REFTYPES",
    depends_if("--enable-wasm-private-reftypes")(lambda x: True),
)
set_define(
    "WASM_PRIVATE_REFTYPES",
    depends_if("--enable-wasm-private-reftypes")(lambda x: True),
)

# Support for WebAssembly shared memory and atomics.
#
# This affects the JS shell only and here to allow the use of
# Cranelift in the shell.  Once Cranelift supports shared memory
# and atomics it can go away.
# =====================================================

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:
        return

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


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


@depends("--enable-wasm-simd", "--enable-jit", "--enable-simulator", target)
def wasm_simd(value, jit_enabled, simulator, target):
    if not value:
        return

    if not jit_enabled:
        return

    if simulator:
        return

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

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


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

# Wormhole opcodes are Intel-only.  They are private to Firefox, but we need them for some
# experiments on release and so they ride the trains.


@depends("--enable-simulator", "--enable-wasm-simd", target)
def default_wasm_simd_wormhole(simulator, wasm_simd, target):
    if wasm_simd and target.cpu in ("x86", "x86_64") and not simulator:
        return True


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


@depends(
    "--enable-wasm-simd-wormhole", "--enable-wasm-simd", "--enable-simulator", target
)
def wasm_simd_wormhole(value, wasm_simd, simulator, target):
    if not value:
        return

    if wasm_simd and target.cpu in ("x86", "x86_64") and not simulator:
        return True

    die("SIMD wormhole currently supported on native x86/x64 only, with --wasm-simd")


set_config("ENABLE_WASM_SIMD_WORMHOLE", wasm_simd_wormhole)
set_define("ENABLE_WASM_SIMD_WORMHOLE", wasm_simd_wormhole)


# 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)
# ======================================================
option("--with-system-icu", help="Use system ICU")

system_icu = pkg_check_modules("MOZ_ICU", "icu-i18n >= 67.1", when="--with-system-icu")

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

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(check_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))


# 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),
)

# Support for WebAssembly exceptions
# ==================================


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


option(
    "--enable-wasm-exceptions",
    default=default_wasm_exceptions,
    help="{Enable|Disable} WebAssembly exceptions",
)

set_config(
    "ENABLE_WASM_EXCEPTIONS", depends_if("--enable-wasm-exceptions")(lambda x: True)
)
set_define(
    "ENABLE_WASM_EXCEPTIONS", depends_if("--enable-wasm-exceptions")(lambda x: True)
)