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# -*- 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
@depends(target.os)
def arm_option_defaults(os):
if os == "Android":
arch = "armv7-a"
thumb = "yes"
fpu = "neon"
float_abi = "softfp"
else:
arch = thumb = fpu = float_abi = "toolchain-default"
return namespace(
arch=arch,
thumb=thumb,
fpu=fpu,
float_abi=float_abi,
)
# Note: '{...|}' in the help of all options with a non-constant default to
# make the lint happy. The first arm is always going to be used, because a
# default is always returned. The lint is fooled by this file being
# conditional. If it weren't conditional, the lint wouldn't ask for '{|}' to
# be there.
option(
"--with-arch",
nargs=1,
default=arm_option_defaults.arch,
help="{Use specific CPU features (-march=type). Resets thumb, fpu, "
"float-abi, etc. defaults when set|}",
)
@depends("--with-arch")
def arch_option(value):
if value:
if value[0] != "toolchain-default":
return ["-march={}".format(value[0])]
return []
option(
"--with-thumb",
choices=("yes", "no", "toolchain-default"),
default=arm_option_defaults.thumb,
nargs="?",
help="{Use Thumb instruction set (-mthumb)|}",
)
def normalize_arm_option(value):
if value:
if len(value):
if value[0] == "yes":
return True
elif value[0] == "no":
return False
else:
return value[0]
return True
return False
@depends("--with-thumb")
def thumb_option(value):
value = normalize_arm_option(value)
if value is True:
return ["-mthumb"]
if value is False:
return ["-marm"]
return []
option(
"--with-thumb-interwork",
choices=("yes", "no", "toolchain-default"),
default="toolchain-default",
nargs="?",
help="Use Thumb/ARM instuctions interwork (-mthumb-interwork)",
)
@depends("--with-thumb-interwork")
def thumb_interwork_option(value):
value = normalize_arm_option(value)
if value is True:
return ["-mthumb-interwork"]
if value is False:
return ["-mno-thumb-interwork"]
return []
option(
"--with-fpu",
nargs=1,
default=arm_option_defaults.fpu,
help="{Use specific FPU type (-mfpu=type)|}",
)
@depends("--with-fpu")
def fpu_option(value):
if value:
if value[0] != "toolchain-default":
return ["-mfpu={}".format(value[0])]
return []
option(
"--with-float-abi",
nargs=1,
default=arm_option_defaults.float_abi,
help="{Use specific arm float ABI (-mfloat-abi=type)|}",
)
@depends("--with-float-abi")
def float_abi_option(value):
if value:
if value[0] != "toolchain-default":
return ["-mfloat-abi={}".format(value[0])]
return []
option(
"--with-soft-float",
choices=("yes", "no", "toolchain-default"),
default="toolchain-default",
nargs="?",
help="Use soft float library (-msoft-float)",
)
@depends("--with-soft-float")
def soft_float_option(value):
value = normalize_arm_option(value)
if value is True:
return ["-msoft-float"]
if value is False:
return ["-mno-soft-float"]
return []
check_and_add_flag(
"-mno-unaligned-access", when=depends(target.os)(lambda os: os == "Android")
)
# The set of flags that clang understands
@depends(
arch_option,
thumb_option,
fpu_option,
float_abi_option,
soft_float_option,
)
def all_clang_arm_flags(arch, thumb, fpu, float_abi, soft_float):
return arch + thumb + fpu + float_abi + soft_float
# All the flags the compiler understands. When the compiler is clang, this
# still includes unsupported flags, but we live it to configure to fail
# during a compiler check. These checks aren't available for clang as used
# by bindgen, so we keep the separate set of flags for clang for bindgen.
@depends(all_clang_arm_flags, thumb_interwork_option)
def all_arm_flags(flags, interwork):
return flags + interwork
@depends(configure_cache, c_compiler, all_arm_flags)
@checking("ARM version support in compiler", lambda x: x.arm_arch)
@imports(_from="textwrap", _import="dedent")
def arm_target(configure_cache, compiler, all_arm_flags):
# We're going to preprocess the following source to figure out some details
# about the arm target options we have enabled.
source = dedent(
"""\
%ARM_ARCH __ARM_ARCH
#if __thumb2__
%THUMB2 yes
#else
%THUMB2 no
#endif
// Confusingly, the __SOFTFP__ preprocessor variable indicates the
// "softfloat" ABI, not the "softfp" ABI.
#if __SOFTFP__
%FLOAT_ABI soft
#elif __ARM_PCS_VFP
%FLOAT_ABI hard
#else
%FLOAT_ABI softfp
#endif
// There is more subtlety to it than this preprocessor test, but MOZ_FPU doesn't
// need to be too fine-grained.
#if __ARM_NEON
%FPU neon
#elif __ARM_VFPV2__ || __ARM_FP == 12
%FPU vfpv2
#elif __ARM_VFPV3__
%FPU vfpv3
#elif __ARM_VFPV4__ || __ARM_FP == 14
%FPU vfpv4
#elif __ARM_FPV5__
%FPU fp-armv8
#endif
"""
)
result = try_invoke_compiler(
configure_cache,
[compiler.compiler] + compiler.flags,
compiler.language,
source,
["-E"] + all_arm_flags,
wrapper=compiler.wrapper,
)
# Metadata emitted by preprocessors such as GCC with LANG=ja_JP.utf-8 may
# have non-ASCII characters. Treat the output as bytearray.
data = {"fpu": None} # fpu may not get a value from the preprocessor.
for line in result.splitlines():
if line.startswith("%"):
k, _, v = line.partition(" ")
k = k.lstrip("%").lower()
if k == "arm_arch":
data[k] = int(v)
else:
data[k] = {
"yes": True,
"no": False,
}.get(v, v)
log.debug("%s = %s", k, data[k])
return namespace(**data)
@depends(arm_target.arm_arch, when=depends(target.os)(lambda os: os == "Android"))
def armv7(arch):
if arch < 7:
die("Android/armv6 and earlier are not supported")
set_config("MOZ_THUMB2", True, when=arm_target.thumb2)
set_define("MOZ_THUMB2", True, when=arm_target.thumb2)
have_arm_simd = c_compiler.try_compile(
body='asm("uqadd8 r1, r1, r2");', check_msg="for ARM SIMD support in compiler"
)
set_config("HAVE_ARM_SIMD", have_arm_simd)
set_define("HAVE_ARM_SIMD", have_arm_simd)
have_arm_neon = c_compiler.try_compile(
body='asm(".fpu neon\\n vadd.i8 d0, d0, d0");',
check_msg="for ARM NEON support in compiler",
)
set_config("HAVE_ARM_NEON", have_arm_neon)
set_define("HAVE_ARM_NEON", have_arm_neon)
# We don't need to build NEON support if we're targetting a non-NEON device.
# This matches media/webrtc/trunk/webrtc/build/common.gypi.
@depends(arm_target.arm_arch, when=have_arm_neon)
def build_arm_neon(arm_arch):
return arm_arch >= 7
set_config("BUILD_ARM_NEON", True, when=build_arm_neon)
set_define("BUILD_ARM_NEON", True, when=build_arm_neon)
set_config("ARM_ARCH", depends(arm_target.arm_arch)(lambda x: str(x)))
set_config("MOZ_FPU", arm_target.fpu)
@depends(arm_target)
def neon_flags(arm_target):
# Building with -mfpu=neon requires either the "softfp" or the
# "hardfp" ABI. Depending on the compiler's default target, and the
# CFLAGS, the default ABI might be neither, in which case it is the
# "softfloat" ABI.
# The "softfloat" ABI is binary-compatible with the "softfp" ABI, so
# we can safely mix code built with both ABIs. So, if we detect
# that compiling uses the "softfloat" ABI, force the use of the
# "softfp" ABI instead.
flags = ["-mfpu=neon"]
if arm_target.float_abi == "soft":
flags.append("-mfloat-abi=softfp")
if arm_target.arm_arch < 7:
# clang needs to be forced to at least armv7 for -mfpu=neon to do
# something.
flags.append("-march=armv7-a")
return tuple(flags)
set_config("NEON_FLAGS", neon_flags)