core/nodes/1_lib/systems/parse.nix

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# Define the list of system with their properties.
#
# See https://clang.llvm.org/docs/CrossCompilation.html and
# http://llvm.org/docs/doxygen/html/Triple_8cpp_source.html especially
# Triple::normalize. Parsing should essentially act as a more conservative
# version of that last function.
#
# Most of the types below come in "open" and "closed" pairs. The open ones
# specify what information we need to know about systems in general, and the
# closed ones are sub-types representing the whitelist of systems we support in
# practice.
#
# Code in the remainder of nixpkgs shouldn't rely on the closed ones in
# e.g. exhaustive cases. Its more a sanity check to make sure nobody defines
# systems that overlap with existing ones and won't notice something amiss.
#
{ lib }:
let
inherit (lib)
all
any
attrValues
elem
elemAt
hasPrefix
id
length
mapAttrs
mergeOneOption
optionalString
splitString
versionAtLeast
;
inherit (lib.strings) match;
inherit (lib.systems.inspect.predicates)
isAarch32
isBigEndian
isDarwin
isLinux
isPower64
isWindows
;
inherit (lib.types)
enum
float
isType
mkOptionType
number
setType
string
types
;
setTypes = type:
mapAttrs (name: value:
assert type.check value;
setType type.name ({ inherit name; } // value));
# gnu-config will ignore the portion of a triple matching the
# regex `e?abi.*$` when determining the validity of a triple. In
# other words, `i386-linuxabichickenlips` is a valid triple.
removeAbiSuffix = x:
let found = match "(.*)e?abi.*" x;
in if found == null
then x
else elemAt found 0;
in
rec {
################################################################################
types.openSignificantByte = mkOptionType {
name = "significant-byte";
description = "Endianness";
merge = mergeOneOption;
};
types.significantByte = enum (attrValues significantBytes);
significantBytes = setTypes types.openSignificantByte {
bigEndian = {};
littleEndian = {};
};
################################################################################
# Reasonable power of 2
types.bitWidth = enum [ 8 16 32 64 128 ];
################################################################################
types.openCpuType = mkOptionType {
name = "cpu-type";
description = "instruction set architecture name and information";
merge = mergeOneOption;
check = x: types.bitWidth.check x.bits
&& (if 8 < x.bits
then types.significantByte.check x.significantByte
else !(x ? significantByte));
};
types.cpuType = enum (attrValues cpuTypes);
cpuTypes = let inherit (significantBytes) bigEndian littleEndian; in setTypes types.openCpuType {
arm = { bits = 32; significantByte = littleEndian; family = "arm"; };
armv5tel = { bits = 32; significantByte = littleEndian; family = "arm"; version = "5"; arch = "armv5t"; };
armv6m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; arch = "armv6-m"; };
armv6l = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; arch = "armv6"; };
armv7a = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; arch = "armv7-a"; };
armv7r = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; arch = "armv7-r"; };
armv7m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; arch = "armv7-m"; };
armv7l = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; arch = "armv7"; };
armv8a = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; arch = "armv8-a"; };
armv8r = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; arch = "armv8-a"; };
armv8m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; arch = "armv8-m"; };
aarch64 = { bits = 64; significantByte = littleEndian; family = "arm"; version = "8"; arch = "armv8-a"; };
aarch64_be = { bits = 64; significantByte = bigEndian; family = "arm"; version = "8"; arch = "armv8-a"; };
i386 = { bits = 32; significantByte = littleEndian; family = "x86"; arch = "i386"; };
i486 = { bits = 32; significantByte = littleEndian; family = "x86"; arch = "i486"; };
i586 = { bits = 32; significantByte = littleEndian; family = "x86"; arch = "i586"; };
i686 = { bits = 32; significantByte = littleEndian; family = "x86"; arch = "i686"; };
x86_64 = { bits = 64; significantByte = littleEndian; family = "x86"; arch = "x86-64"; };
microblaze = { bits = 32; significantByte = bigEndian; family = "microblaze"; };
microblazeel = { bits = 32; significantByte = littleEndian; family = "microblaze"; };
mips = { bits = 32; significantByte = bigEndian; family = "mips"; };
mipsel = { bits = 32; significantByte = littleEndian; family = "mips"; };
mips64 = { bits = 64; significantByte = bigEndian; family = "mips"; };
mips64el = { bits = 64; significantByte = littleEndian; family = "mips"; };
mmix = { bits = 64; significantByte = bigEndian; family = "mmix"; };
m68k = { bits = 32; significantByte = bigEndian; family = "m68k"; };
powerpc = { bits = 32; significantByte = bigEndian; family = "power"; };
powerpc64 = { bits = 64; significantByte = bigEndian; family = "power"; };
powerpc64le = { bits = 64; significantByte = littleEndian; family = "power"; };
powerpcle = { bits = 32; significantByte = littleEndian; family = "power"; };
riscv32 = { bits = 32; significantByte = littleEndian; family = "riscv"; };
riscv64 = { bits = 64; significantByte = littleEndian; family = "riscv"; };
s390 = { bits = 32; significantByte = bigEndian; family = "s390"; };
s390x = { bits = 64; significantByte = bigEndian; family = "s390"; };
sparc = { bits = 32; significantByte = bigEndian; family = "sparc"; };
sparc64 = { bits = 64; significantByte = bigEndian; family = "sparc"; };
wasm32 = { bits = 32; significantByte = littleEndian; family = "wasm"; };
wasm64 = { bits = 64; significantByte = littleEndian; family = "wasm"; };
alpha = { bits = 64; significantByte = littleEndian; family = "alpha"; };
rx = { bits = 32; significantByte = littleEndian; family = "rx"; };
msp430 = { bits = 16; significantByte = littleEndian; family = "msp430"; };
avr = { bits = 8; family = "avr"; };
vc4 = { bits = 32; significantByte = littleEndian; family = "vc4"; };
or1k = { bits = 32; significantByte = bigEndian; family = "or1k"; };
loongarch64 = { bits = 64; significantByte = littleEndian; family = "loongarch"; };
javascript = { bits = 32; significantByte = littleEndian; family = "javascript"; };
};
# GNU build systems assume that older NetBSD architectures are using a.out.
gnuNetBSDDefaultExecFormat = cpu:
if (cpu.family == "arm" && cpu.bits == 32) ||
(cpu.family == "sparc" && cpu.bits == 32) ||
(cpu.family == "m68k" && cpu.bits == 32) ||
(cpu.family == "x86" && cpu.bits == 32)
then execFormats.aout
else execFormats.elf;
# Determine when two CPUs are compatible with each other. That is,
# can code built for system B run on system A? For that to happen,
# the programs that system B accepts must be a subset of the
# programs that system A accepts.
#
# We have the following properties of the compatibility relation,
# which must be preserved when adding compatibility information for
# additional CPUs.
# - (reflexivity)
# Every CPU is compatible with itself.
# - (transitivity)
# If A is compatible with B and B is compatible with C then A is compatible with C.
#
# Note: Since 22.11 the archs of a mode switching CPU are no longer considered
# pairwise compatible. Mode switching implies that binaries built for A
# and B respectively can't be executed at the same time.
isCompatible = with cpuTypes; a: b: any id [
# x86
(b == i386 && isCompatible a i486)
(b == i486 && isCompatible a i586)
(b == i586 && isCompatible a i686)
# XXX: Not true in some cases. Like in WSL mode.
(b == i686 && isCompatible a x86_64)
# ARMv4
(b == arm && isCompatible a armv5tel)
# ARMv5
(b == armv5tel && isCompatible a armv6l)
# ARMv6
(b == armv6l && isCompatible a armv6m)
(b == armv6m && isCompatible a armv7l)
# ARMv7
(b == armv7l && isCompatible a armv7a)
(b == armv7l && isCompatible a armv7r)
(b == armv7l && isCompatible a armv7m)
# ARMv8
(b == aarch64 && a == armv8a)
(b == armv8a && isCompatible a aarch64)
(b == armv8r && isCompatible a armv8a)
(b == armv8m && isCompatible a armv8a)
# PowerPC
(b == powerpc && isCompatible a powerpc64)
(b == powerpcle && isCompatible a powerpc64le)
# MIPS
(b == mips && isCompatible a mips64)
(b == mipsel && isCompatible a mips64el)
# RISCV
(b == riscv32 && isCompatible a riscv64)
# SPARC
(b == sparc && isCompatible a sparc64)
# WASM
(b == wasm32 && isCompatible a wasm64)
# identity
(b == a)
];
################################################################################
types.openVendor = mkOptionType {
name = "vendor";
description = "vendor for the platform";
merge = mergeOneOption;
};
types.vendor = enum (attrValues vendors);
vendors = setTypes types.openVendor {
apple = {};
pc = {};
knuth = {};
# Actually matters, unlocking some MinGW-w64-specific options in GCC. See
# bottom of https://sourceforge.net/p/mingw-w64/wiki2/Unicode%20apps/
w64 = {};
none = {};
unknown = {};
};
################################################################################
types.openExecFormat = mkOptionType {
name = "exec-format";
description = "executable container used by the kernel";
merge = mergeOneOption;
};
types.execFormat = enum (attrValues execFormats);
execFormats = setTypes types.openExecFormat {
aout = {}; # a.out
elf = {};
macho = {};
pe = {};
wasm = {};
unknown = {};
};
################################################################################
types.openKernelFamily = mkOptionType {
name = "exec-format";
description = "executable container used by the kernel";
merge = mergeOneOption;
};
types.kernelFamily = enum (attrValues kernelFamilies);
kernelFamilies = setTypes types.openKernelFamily {
bsd = {};
darwin = {};
};
################################################################################
types.openKernel = mkOptionType {
name = "kernel";
description = "kernel name and information";
merge = mergeOneOption;
check = x: types.execFormat.check x.execFormat
&& all types.kernelFamily.check (attrValues x.families);
};
types.kernel = enum (attrValues kernels);
kernels = let
inherit (execFormats) elf pe wasm unknown macho;
inherit (kernelFamilies) bsd darwin;
in setTypes types.openKernel {
# TODO(@Ericson2314): Don't want to mass-rebuild yet to keeping 'darwin' as
# the normalized name for macOS.
macos = { execFormat = macho; families = { inherit darwin; }; name = "darwin"; };
ios = { execFormat = macho; families = { inherit darwin; }; };
freebsd = { execFormat = elf; families = { inherit bsd; }; name = "freebsd"; };
linux = { execFormat = elf; families = { }; };
netbsd = { execFormat = elf; families = { inherit bsd; }; };
none = { execFormat = unknown; families = { }; };
openbsd = { execFormat = elf; families = { inherit bsd; }; };
solaris = { execFormat = elf; families = { }; };
wasi = { execFormat = wasm; families = { }; };
redox = { execFormat = elf; families = { }; };
windows = { execFormat = pe; families = { }; };
ghcjs = { execFormat = unknown; families = { }; };
genode = { execFormat = elf; families = { }; };
mmixware = { execFormat = unknown; families = { }; };
} // { # aliases
# 'darwin' is the kernel for all of them. We choose macOS by default.
darwin = kernels.macos;
watchos = kernels.ios;
tvos = kernels.ios;
win32 = kernels.windows;
};
################################################################################
types.openAbi = mkOptionType {
name = "abi";
description = "binary interface for compiled code and syscalls";
merge = mergeOneOption;
};
types.abi = enum (attrValues abis);
abis = setTypes types.openAbi {
cygnus = {};
msvc = {};
# Note: eabi is specific to ARM and PowerPC.
# On PowerPC, this corresponds to PPCEABI.
# On ARM, this corresponds to ARMEABI.
eabi = { float = "soft"; };
eabihf = { float = "hard"; };
# Other architectures should use ELF in embedded situations.
elf = {};
androideabi = {};
android = {
assertions = [
{ assertion = platform: !platform.isAarch32;
message = ''
The "android" ABI is not for 32-bit ARM. Use "androideabi" instead.
'';
}
];
};
gnueabi = { float = "soft"; };
gnueabihf = { float = "hard"; };
gnu = {
assertions = [
{ assertion = platform: !platform.isAarch32;
message = ''
The "gnu" ABI is ambiguous on 32-bit ARM. Use "gnueabi" or "gnueabihf" instead.
'';
}
{ assertion = platform: !(platform.isPower64 && platform.isBigEndian);
message = ''
The "gnu" ABI is ambiguous on big-endian 64-bit PowerPC. Use "gnuabielfv2" or "gnuabielfv1" instead.
'';
}
];
};
gnuabi64 = { abi = "64"; };
muslabi64 = { abi = "64"; };
# NOTE: abi=n32 requires a 64-bit MIPS chip! That is not a typo.
# It is basically the 64-bit abi with 32-bit pointers. Details:
# https://www.linux-mips.org/pub/linux/mips/doc/ABI/MIPS-N32-ABI-Handbook.pdf
gnuabin32 = { abi = "n32"; };
muslabin32 = { abi = "n32"; };
gnuabielfv2 = { abi = "elfv2"; };
gnuabielfv1 = { abi = "elfv1"; };
musleabi = { float = "soft"; };
musleabihf = { float = "hard"; };
musl = {};
uclibceabi = { float = "soft"; };
uclibceabihf = { float = "hard"; };
uclibc = {};
unknown = {};
};
################################################################################
types.parsedPlatform = mkOptionType {
name = "system";
description = "fully parsed representation of llvm- or nix-style platform tuple";
merge = mergeOneOption;
check = { cpu, vendor, kernel, abi }:
types.cpuType.check cpu
&& types.vendor.check vendor
&& types.kernel.check kernel
&& types.abi.check abi;
};
isSystem = isType "system";
mkSystem = components:
assert types.parsedPlatform.check components;
setType "system" components;
mkSkeletonFromList = l: {
"1" = if elemAt l 0 == "avr"
then { cpu = elemAt l 0; kernel = "none"; abi = "unknown"; }
else throw "Target specification with 1 components is ambiguous";
"2" = # We only do 2-part hacks for things Nix already supports
if elemAt l 1 == "cygwin"
then { cpu = elemAt l 0; kernel = "windows"; abi = "cygnus"; }
# MSVC ought to be the default ABI so this case isn't needed. But then it
# becomes difficult to handle the gnu* variants for Aarch32 correctly for
# minGW. So it's easier to make gnu* the default for the MinGW, but
# hack-in MSVC for the non-MinGW case right here.
else if elemAt l 1 == "windows"
then { cpu = elemAt l 0; kernel = "windows"; abi = "msvc"; }
else if (elemAt l 1) == "elf"
then { cpu = elemAt l 0; vendor = "unknown"; kernel = "none"; abi = elemAt l 1; }
else { cpu = elemAt l 0; kernel = elemAt l 1; };
"3" =
# cpu-kernel-environment
if elemAt l 1 == "linux" ||
elem (elemAt l 2) ["eabi" "eabihf" "elf" "gnu"]
then {
cpu = elemAt l 0;
kernel = elemAt l 1;
abi = elemAt l 2;
vendor = "unknown";
}
# cpu-vendor-os
else if elemAt l 1 == "apple" ||
elem (elemAt l 2) [ "wasi" "redox" "mmixware" "ghcjs" "mingw32" ] ||
hasPrefix "freebsd" (elemAt l 2) ||
hasPrefix "netbsd" (elemAt l 2) ||
hasPrefix "genode" (elemAt l 2)
then {
cpu = elemAt l 0;
vendor = elemAt l 1;
kernel = if elemAt l 2 == "mingw32"
then "windows" # autotools breaks on -gnu for window
else elemAt l 2;
}
else throw "Target specification with 3 components is ambiguous";
"4" = { cpu = elemAt l 0; vendor = elemAt l 1; kernel = elemAt l 2; abi = elemAt l 3; };
}.${toString (length l)}
or (throw "system string has invalid number of hyphen-separated components");
# This should revert the job done by config.guess from the gcc compiler.
mkSystemFromSkeleton = { cpu
, # Optional, but fallback too complex for here.
# Inferred below instead.
vendor ? assert false; null
, kernel
, # Also inferred below
abi ? assert false; null
} @ args: let
getCpu = name: cpuTypes.${name} or (throw "Unknown CPU type: ${name}");
getVendor = name: vendors.${name} or (throw "Unknown vendor: ${name}");
getKernel = name: kernels.${name} or (throw "Unknown kernel: ${name}");
getAbi = name: abis.${name} or (throw "Unknown ABI: ${name}");
parsed = {
cpu = getCpu args.cpu;
vendor =
/**/ if args ? vendor then getVendor args.vendor
else if isDarwin parsed then vendors.apple
else if isWindows parsed then vendors.pc
else vendors.unknown;
kernel = if hasPrefix "darwin" args.kernel then getKernel "darwin"
else if hasPrefix "netbsd" args.kernel then getKernel "netbsd"
else getKernel (removeAbiSuffix args.kernel);
abi =
/**/ if args ? abi then getAbi args.abi
else if isLinux parsed || isWindows parsed then
if isAarch32 parsed then
if versionAtLeast (parsed.cpu.version or "0") "6"
then abis.gnueabihf
else abis.gnueabi
# Default ppc64 BE to ELFv2
else if isPower64 parsed && isBigEndian parsed then abis.gnuabielfv2
else abis.gnu
else abis.unknown;
};
in mkSystem parsed;
mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (splitString "-" s));
kernelName = kernel:
kernel.name + toString (kernel.version or "");
doubleFromSystem = { cpu, kernel, abi, ... }:
/**/ if abi == abis.cygnus then "${cpu.name}-cygwin"
else if kernel.families ? darwin then "${cpu.name}-darwin"
else "${cpu.name}-${kernelName kernel}";
tripleFromSystem = { cpu, vendor, kernel, abi, ... } @ sys: assert isSystem sys; let
optExecFormat =
optionalString (kernel.name == "netbsd" &&
gnuNetBSDDefaultExecFormat cpu != kernel.execFormat)
kernel.execFormat.name;
optAbi = optionalString (abi != abis.unknown) "-${abi.name}";
in "${cpu.name}-${vendor.name}-${kernelName kernel}${optExecFormat}${optAbi}";
################################################################################
}