nixpkgs/lib/systems/parse.nix
2020-07-21 13:11:36 -07:00

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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 }:
with lib.lists;
with lib.types;
with lib.attrsets;
with lib.strings;
with (import ./inspect.nix { inherit lib; }).predicates;
let
inherit (lib.options) mergeOneOption;
setTypes = type:
mapAttrs (name: value:
assert type.check value;
setType type.name ({ inherit name; } // value));
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 = with significantBytes; 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"; };
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"; };
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"; };
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"; };
msp430 = { bits = 16; significantByte = littleEndian; family = "msp430"; };
avr = { bits = 8; family = "avr"; };
vc4 = { bits = 32; significantByte = littleEndian; family = "vc4"; };
js = { bits = 32; significantByte = littleEndian; family = "js"; };
};
# Determine where two CPUs are compatible with each other. That is,
# can we run code built for system b on system a? For that to
# happen, then the set of all possible possible programs that system
# b accepts must be a subset of the set of all programs that system
# a accepts. This compatibility relation forms a category where each
# CPU is an object and each arrow from a to b represents
# compatibility. CPUs with multiple modes of Endianness are
# isomorphic while all CPUs are endomorphic because any program
# built for a CPU can run on that CPU.
isCompatible = a: b: with cpuTypes; lib.any lib.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)
(b == armv7a && isCompatible a armv8a)
(b == armv7r && isCompatible a armv8a)
(b == armv7m && isCompatible a armv8a)
(b == armv7a && isCompatible a armv8r)
(b == armv7r && isCompatible a armv8r)
(b == armv7m && isCompatible a armv8r)
(b == armv7a && isCompatible a armv8m)
(b == armv7r && isCompatible a armv8m)
(b == armv7m && isCompatible a armv8m)
# ARMv8
(b == armv8r && isCompatible a armv8a)
(b == armv8m && isCompatible a armv8a)
# XXX: not always true! Some arm64 cpus dont support arm32 mode.
(b == aarch64 && a == armv8a)
(b == armv8a && isCompatible a aarch64)
(b == aarch64 && a == aarch64_be)
(b == aarch64_be && isCompatible a aarch64)
# PowerPC
(b == powerpc && isCompatible a powerpc64)
(b == powerpcle && isCompatible a powerpc)
(b == powerpc && a == powerpcle)
(b == powerpc64le && isCompatible a powerpc64)
(b == powerpc64 && a == powerpc64le)
# MIPS
(b == mips && isCompatible a mips64)
(b == mips && a == mipsel)
(b == mipsel && isCompatible a mips)
(b == mips64 && a == mips64el)
(b == mips64el && isCompatible a mips64)
# 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 = {};
# 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 = with execFormats; with kernelFamilies; setTypes types.openKernel {
# TODO(@Ericson2314): Don't want to mass-rebuild yet to keeping 'darwin' as
# the nnormalized name for macOS.
macos = { execFormat = macho; families = { inherit darwin; }; name = "darwin"; };
ios = { execFormat = macho; families = { inherit darwin; }; };
freebsd = { execFormat = elf; families = { inherit bsd; }; };
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 = { }; };
} // { # 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.
'';
}
];
};
gnuabi64 = { abi = "64"; };
musleabi = { float = "soft"; };
musleabihf = { float = "hard"; };
musl = {};
uclibceabihf = { float = "soft"; };
uclibceabi = { 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" = # Awkwards hacks, beware!
if elemAt l 1 == "apple"
then { cpu = elemAt l 0; vendor = "apple"; kernel = elemAt l 2; }
else if (elemAt l 1 == "linux") || (elemAt l 2 == "gnu")
then { cpu = elemAt l 0; kernel = elemAt l 1; abi = elemAt l 2; }
else if (elemAt l 2 == "mingw32") # autotools breaks on -gnu for window
then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "windows"; }
else if (elemAt l 2 == "wasi")
then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "wasi"; }
else if (elemAt l 2 == "redox")
then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "redox"; }
else if hasPrefix "netbsd" (elemAt l 2)
then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = elemAt l 2; }
else if (elem (elemAt l 2) ["eabi" "eabihf" "elf"])
then { cpu = elemAt l 0; vendor = "unknown"; kernel = elemAt l 1; abi = elemAt l 2; }
else if (elemAt l 2 == "ghcjs")
then { cpu = elemAt l 0; vendor = "unknown"; kernel = elemAt l 2; }
else if hasPrefix "genode" (elemAt l 2)
then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = 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: ${name}");
parsed = {
cpu = getCpu args.cpu;
vendor =
/**/ if args ? vendor then getVendor args.vendor
else if isDarwin parsed then vendors.apple
else if isWindows parsed then vendors.pc
else vendors.unknown;
kernel = if hasPrefix "darwin" args.kernel then getKernel "darwin"
else if hasPrefix "netbsd" args.kernel then getKernel "netbsd"
else getKernel args.kernel;
abi =
/**/ if args ? abi then getAbi args.abi
else if isLinux parsed || isWindows parsed then
if isAarch32 parsed then
if lib.versionAtLeast (parsed.cpu.version or "0") "6"
then abis.gnueabihf
else abis.gnueabi
else abis.gnu
else abis.unknown;
};
in mkSystem parsed;
mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (lib.splitString "-" s));
doubleFromSystem = { cpu, kernel, abi, ... }:
/**/ if abi == abis.cygnus then "${cpu.name}-cygwin"
else if kernel.families ? darwin then "${cpu.name}-darwin"
else "${cpu.name}-${kernel.name}";
tripleFromSystem = { cpu, vendor, kernel, abi, ... } @ sys: assert isSystem sys; let
optAbi = lib.optionalString (abi != abis.unknown) "-${abi.name}";
in "${cpu.name}-${vendor.name}-${kernel.name}${optAbi}";
################################################################################
}