nixpkgs/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.
#
Convert libs to a fixed-point This does break the API of being able to import any lib file and get its libs, however I'm not sure people did this. I made this while exploring being able to swap out docFn with a stub in #2305, to avoid functor performance problems. I don't know if that is going to move forward (or if it is a problem or not,) but after doing all this work figured I'd put it up anyway :) Two notable advantages to this approach: 1. when a lib inherits another lib's functions, it doesn't automatically get put in to the scope of lib 2. when a lib implements a new obscure functions, it doesn't automatically get put in to the scope of lib Using the test script (later in this commit) I got the following diff on the API: + diff master fixed-lib 11764a11765,11766 > .types.defaultFunctor > .types.defaultTypeMerge 11774a11777,11778 > .types.isOptionType > .types.isType 11781a11786 > .types.mkOptionType 11788a11794 > .types.setType 11795a11802 > .types.types This means that this commit _adds_ to the API, however I can't find a way to fix these last remaining discrepancies. At least none are _removed_. Test script (run with nix-repl in the PATH): #!/bin/sh set -eux repl() { suff=${1:-} echo "(import ./lib)$suff" \ | nix-repl 2>&1 } attrs_to_check() { repl "${1:-}" \ | tr ';' $'\n' \ | grep "\.\.\." \ | cut -d' ' -f2 \ | sed -e "s/^/${1:-}./" \ | sort } summ() { repl "${1:-}" \ | tr ' ' $'\n' \ | sort \ | uniq } deep_summ() { suff="${1:-}" depth="${2:-4}" depth=$((depth - 1)) summ "$suff" for attr in $(attrs_to_check "$suff" | grep -v "types.types"); do if [ $depth -eq 0 ]; then summ "$attr" | sed -e "s/^/$attr./" else deep_summ "$attr" "$depth" | sed -e "s/^/$attr./" fi done } ( cd nixpkgs #git add . #git commit -m "Auto-commit, sorry" || true git checkout fixed-lib deep_summ > ../fixed-lib git checkout master deep_summ > ../master ) if diff master fixed-lib; then echo "SHALLOW MATCH!" fi ( cd nixpkgs git checkout fixed-lib repl .types )
2017-07-29 01:05:35 +01:00
{ lib }:
with lib.lists;
with lib.types;
with lib.attrsets;
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"; };
armv6m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; };
armv6l = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; };
armv7a = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
armv7r = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
armv7m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
armv7l = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
armv8a = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
armv8r = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
armv8m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
aarch64 = { bits = 64; significantByte = littleEndian; family = "arm"; version = "8"; };
i686 = { bits = 32; significantByte = littleEndian; family = "x86"; };
x86_64 = { bits = 64; significantByte = littleEndian; family = "x86"; };
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"; };
riscv32 = { bits = 32; significantByte = littleEndian; family = "riscv"; };
riscv64 = { bits = 64; significantByte = littleEndian; family = "riscv"; };
wasm32 = { bits = 32; significantByte = littleEndian; family = "wasm"; };
wasm64 = { bits = 64; significantByte = littleEndian; family = "wasm"; };
};
################################################################################
types.openVendor = mkOptionType {
name = "vendor";
description = "vendor for the platform";
merge = mergeOneOption;
};
types.vendor = enum (attrValues vendors);
vendors = setTypes types.openVendor {
apple = {};
pc = {};
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 = {};
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; }; };
hurd = { execFormat = elf; families = { }; };
linux = { execFormat = elf; families = { }; };
netbsd = { execFormat = elf; families = { inherit bsd; }; };
none = { execFormat = unknown; families = { }; };
openbsd = { execFormat = elf; families = { inherit bsd; }; };
solaris = { execFormat = elf; families = { }; };
windows = { execFormat = pe; families = { }; };
} // { # aliases
# 'darwin' is the kernel for all of them. We choose macOS by default.
darwin = kernels.macos;
# TODO(@Ericson2314): Handle these Darwin version suffixes more generally.
darwin10 = kernels.macos;
darwin14 = 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 = {};
eabi = {};
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.
'';
}
];
};
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: {
"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"; }
else if elemAt l 1 == "gnu"
then { cpu = elemAt l 0; kernel = "hurd"; abi = "gnu"; }
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"; abi = "gnu"; }
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: ${name}");
parsed = rec {
cpu = getCpu args.cpu;
vendor =
/**/ if args ? vendor then getVendor args.vendor
else if isDarwin parsed then vendors.apple
else if isWindows parsed then vendors.pc
else vendors.unknown;
kernel = getKernel args.kernel;
abi =
/**/ if args ? abi then getAbi args.abi
else if isLinux parsed then
if isAarch32 parsed then
if lib.versionAtLeast (parsed.cpu.version or "0") "6"
then abis.gnueabihf
else abis.gnueabi
else abis.gnu
else if isWindows parsed then abis.gnu
else abis.unknown;
};
in mkSystem parsed;
mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (lib.splitString "-" s));
doubleFromSystem = { cpu, vendor, kernel, abi, ... }:
/**/ if abi == abis.cygnus then "${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}";
################################################################################
}