293 lines
11 KiB
Nix
293 lines
11 KiB
Nix
# Define the list of system with their properties.
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#
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# See https://clang.llvm.org/docs/CrossCompilation.html and
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# http://llvm.org/docs/doxygen/html/Triple_8cpp_source.html especially
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# Triple::normalize. Parsing should essentially act as a more conservative
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# version of that last function.
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#
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# Most of the types below come in "open" and "closed" pairs. The open ones
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# specify what information we need to know about systems in general, and the
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# closed ones are sub-types representing the whitelist of systems we support in
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# practice.
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#
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# Code in the remainder of nixpkgs shouldn't rely on the closed ones in
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# e.g. exhaustive cases. Its more a sanity check to make sure nobody defines
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# systems that overlap with existing ones and won't notice something amiss.
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#
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{ lib }:
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with lib.lists;
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with lib.types;
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with lib.attrsets;
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with (import ./inspect.nix { inherit lib; }).predicates;
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let
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inherit (lib.options) mergeOneOption;
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setTypes = type:
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mapAttrs (name: value:
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assert type.check value;
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setType type.name ({ inherit name; } // value));
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in
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rec {
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################################################################################
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types.openSignificantByte = mkOptionType {
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name = "significant-byte";
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description = "Endianness";
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merge = mergeOneOption;
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};
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types.significantByte = enum (attrValues significantBytes);
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significantBytes = setTypes types.openSignificantByte {
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bigEndian = {};
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littleEndian = {};
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};
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################################################################################
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# Reasonable power of 2
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types.bitWidth = enum [ 8 16 32 64 128 ];
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################################################################################
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types.openCpuType = mkOptionType {
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name = "cpu-type";
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description = "instruction set architecture name and information";
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merge = mergeOneOption;
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check = x: types.bitWidth.check x.bits
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&& (if 8 < x.bits
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then types.significantByte.check x.significantByte
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else !(x ? significantByte));
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};
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types.cpuType = enum (attrValues cpuTypes);
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cpuTypes = with significantBytes; setTypes types.openCpuType {
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arm = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv5tel = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv6m = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv6l = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv7a = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv7r = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv7m = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv7l = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv8a = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv8r = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv8m = { bits = 32; significantByte = littleEndian; family = "arm"; };
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aarch64 = { bits = 64; significantByte = littleEndian; family = "arm"; };
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i686 = { bits = 32; significantByte = littleEndian; family = "x86"; };
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x86_64 = { bits = 64; significantByte = littleEndian; family = "x86"; };
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mips = { bits = 32; significantByte = bigEndian; family = "mips"; };
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mipsel = { bits = 32; significantByte = littleEndian; family = "mips"; };
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mips64 = { bits = 64; significantByte = bigEndian; family = "mips"; };
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mips64el = { bits = 64; significantByte = littleEndian; family = "mips"; };
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powerpc = { bits = 32; significantByte = bigEndian; family = "power"; };
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riscv32 = { bits = 32; significantByte = littleEndian; family = "riscv"; };
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riscv64 = { bits = 64; significantByte = littleEndian; family = "riscv"; };
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wasm32 = { bits = 32; significantByte = littleEndian; family = "wasm"; };
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wasm64 = { bits = 64; significantByte = littleEndian; family = "wasm"; };
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};
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################################################################################
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types.openVendor = mkOptionType {
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name = "vendor";
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description = "vendor for the platform";
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merge = mergeOneOption;
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};
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types.vendor = enum (attrValues vendors);
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vendors = setTypes types.openVendor {
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apple = {};
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pc = {};
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unknown = {};
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};
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################################################################################
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types.openExecFormat = mkOptionType {
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name = "exec-format";
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description = "executable container used by the kernel";
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merge = mergeOneOption;
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};
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types.execFormat = enum (attrValues execFormats);
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execFormats = setTypes types.openExecFormat {
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aout = {}; # a.out
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elf = {};
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macho = {};
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pe = {};
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unknown = {};
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};
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################################################################################
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types.openKernelFamily = mkOptionType {
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name = "exec-format";
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description = "executable container used by the kernel";
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merge = mergeOneOption;
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};
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types.kernelFamily = enum (attrValues kernelFamilies);
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kernelFamilies = setTypes types.openKernelFamily {
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bsd = {};
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darwin = {};
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};
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################################################################################
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types.openKernel = mkOptionType {
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name = "kernel";
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description = "kernel name and information";
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merge = mergeOneOption;
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check = x: types.execFormat.check x.execFormat
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&& all types.kernelFamily.check (attrValues x.families);
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};
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types.kernel = enum (attrValues kernels);
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kernels = with execFormats; with kernelFamilies; setTypes types.openKernel {
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# TODO(@Ericson2314): Don't want to mass-rebuild yet to keeping 'darwin' as
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# the nnormalized name for macOS.
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macos = { execFormat = macho; families = { inherit darwin; }; name = "darwin"; };
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ios = { execFormat = macho; families = { inherit darwin; }; };
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freebsd = { execFormat = elf; families = { inherit bsd; }; };
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hurd = { execFormat = elf; families = { }; };
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linux = { execFormat = elf; families = { }; };
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netbsd = { execFormat = elf; families = { inherit bsd; }; };
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none = { execFormat = unknown; families = { }; };
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openbsd = { execFormat = elf; families = { inherit bsd; }; };
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solaris = { execFormat = elf; families = { }; };
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windows = { execFormat = pe; families = { }; };
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} // { # aliases
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# 'darwin' is the kernel for all of them. We choose macOS by default.
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darwin = kernels.macos;
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# TODO(@Ericson2314): Handle these Darwin version suffixes more generally.
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darwin10 = kernels.macos;
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darwin14 = kernels.macos;
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watchos = kernels.ios;
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tvos = kernels.ios;
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win32 = kernels.windows;
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};
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################################################################################
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types.openAbi = mkOptionType {
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name = "abi";
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description = "binary interface for compiled code and syscalls";
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merge = mergeOneOption;
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};
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types.abi = enum (attrValues abis);
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abis = setTypes types.openAbi {
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android = {};
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cygnus = {};
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gnu = {};
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msvc = {};
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eabi = {};
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androideabi = {};
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gnueabi = {};
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gnueabihf = {};
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musleabi = {};
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musleabihf = {};
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musl = {};
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uclibceabihf = {};
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uclibceabi = {};
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uclibc = {};
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unknown = {};
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};
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################################################################################
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types.parsedPlatform = mkOptionType {
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name = "system";
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description = "fully parsed representation of llvm- or nix-style platform tuple";
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merge = mergeOneOption;
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check = { cpu, vendor, kernel, abi }:
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types.cpuType.check cpu
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&& types.vendor.check vendor
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&& types.kernel.check kernel
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&& types.abi.check abi;
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};
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isSystem = isType "system";
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mkSystem = components:
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assert types.parsedPlatform.check components;
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setType "system" components;
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mkSkeletonFromList = l: {
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"2" = # We only do 2-part hacks for things Nix already supports
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if elemAt l 1 == "cygwin"
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then { cpu = elemAt l 0; kernel = "windows"; abi = "cygnus"; }
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else if elemAt l 1 == "gnu"
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then { cpu = elemAt l 0; kernel = "hurd"; abi = "gnu"; }
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else { cpu = elemAt l 0; kernel = elemAt l 1; };
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"3" = # Awkwards hacks, beware!
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if elemAt l 1 == "apple"
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then { cpu = elemAt l 0; vendor = "apple"; kernel = elemAt l 2; }
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else if (elemAt l 1 == "linux") || (elemAt l 2 == "gnu")
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then { cpu = elemAt l 0; kernel = elemAt l 1; abi = elemAt l 2; }
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else if (elemAt l 2 == "mingw32") # autotools breaks on -gnu for window
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then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = "windows"; abi = "gnu"; }
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else throw "Target specification with 3 components is ambiguous";
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"4" = { cpu = elemAt l 0; vendor = elemAt l 1; kernel = elemAt l 2; abi = elemAt l 3; };
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}.${toString (length l)}
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or (throw "system string has invalid number of hyphen-separated components");
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# This should revert the job done by config.guess from the gcc compiler.
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mkSystemFromSkeleton = { cpu
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, # Optional, but fallback too complex for here.
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# Inferred below instead.
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vendor ? assert false; null
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, kernel
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, # Also inferred below
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abi ? assert false; null
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} @ args: let
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getCpu = name: cpuTypes.${name} or (throw "Unknown CPU type: ${name}");
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getVendor = name: vendors.${name} or (throw "Unknown vendor: ${name}");
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getKernel = name: kernels.${name} or (throw "Unknown kernel: ${name}");
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getAbi = name: abis.${name} or (throw "Unknown ABI: ${name}");
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parsed = rec {
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cpu = getCpu args.cpu;
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vendor =
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/**/ if args ? vendor then getVendor args.vendor
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else if isDarwin parsed then vendors.apple
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else if isWindows parsed then vendors.pc
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else vendors.unknown;
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kernel = getKernel args.kernel;
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abi =
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/**/ if args ? abi then getAbi args.abi
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else if isLinux parsed then abis.gnu
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else if isWindows parsed then abis.gnu
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else abis.unknown;
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};
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in mkSystem parsed;
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mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (lib.splitString "-" s));
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doubleFromSystem = { cpu, vendor, kernel, abi, ... }:
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/**/ if abi == abis.cygnus then "${cpu.name}-cygwin"
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else if kernel.families ? darwin then "${cpu.name}-darwin"
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else "${cpu.name}-${kernel.name}";
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tripleFromSystem = { cpu, vendor, kernel, abi, ... } @ sys: assert isSystem sys; let
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optAbi = lib.optionalString (abi != abis.unknown) "-${abi.name}";
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in "${cpu.name}-${vendor.name}-${kernel.name}${optAbi}";
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################################################################################
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}
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