418 lines
16 KiB
Nix
418 lines
16 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 lib.strings;
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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"; version = "5"; };
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armv6m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; };
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armv6l = { bits = 32; significantByte = littleEndian; family = "arm"; version = "6"; };
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armv7a = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
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armv7r = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
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armv7m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
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armv7l = { bits = 32; significantByte = littleEndian; family = "arm"; version = "7"; };
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armv8a = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
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armv8r = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
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armv8m = { bits = 32; significantByte = littleEndian; family = "arm"; version = "8"; };
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aarch64 = { bits = 64; significantByte = littleEndian; family = "arm"; version = "8"; };
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aarch64_be = { bits = 64; significantByte = bigEndian; family = "arm"; version = "8"; };
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i386 = { bits = 32; significantByte = littleEndian; family = "x86"; };
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i486 = { bits = 32; significantByte = littleEndian; family = "x86"; };
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i586 = { bits = 32; significantByte = littleEndian; family = "x86"; };
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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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powerpc64 = { bits = 64; significantByte = bigEndian; family = "power"; };
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powerpc64le = { bits = 64; significantByte = littleEndian; family = "power"; };
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powerpcle = { bits = 32; significantByte = littleEndian; 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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sparc = { bits = 32; significantByte = bigEndian; family = "sparc"; };
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sparc64 = { bits = 64; significantByte = bigEndian; family = "sparc"; };
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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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alpha = { bits = 64; significantByte = littleEndian; family = "alpha"; };
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msp430 = { bits = 16; significantByte = littleEndian; family = "msp430"; };
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avr = { bits = 8; family = "avr"; };
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};
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# Determine where two CPUs are compatible with each other. That is,
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# can we run code built for system b on system a? For that to
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# happen, then the set of all possible possible programs that system
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# b accepts must be a subset of the set of all programs that system
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# a accepts. This compatibility relation forms a category where each
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# CPU is an object and each arrow from a to b represents
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# compatibility. CPUs with multiple modes of Endianness are
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# isomorphic while all CPUs are endomorphic because any program
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# built for a CPU can run on that CPU.
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isCompatible = a: b: with cpuTypes; lib.any lib.id [
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# x86
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(b == i386 && isCompatible a i486)
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(b == i486 && isCompatible a i586)
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(b == i586 && isCompatible a i686)
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# NOTE: Not true in some cases. Like in WSL mode.
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(b == i686 && isCompatible a x86_64)
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# ARM
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(b == arm && isCompatible a armv5tel)
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(b == armv5tel && isCompatible a armv6m)
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(b == armv6m && isCompatible a armv6l)
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(b == armv6l && isCompatible a armv7a)
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(b == armv7a && isCompatible a armv7r)
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(b == armv7r && isCompatible a armv7m)
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(b == armv7m && isCompatible a armv7l)
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(b == armv7l && isCompatible a armv8a)
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(b == armv8a && isCompatible a armv8r)
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(b == armv8r && isCompatible a armv8m)
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# NOTE: not always true! Some arm64 cpus don’t support arm32 mode.
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(b == armv8m && isCompatible a aarch64)
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(b == aarch64 && a == aarch64_be)
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(b == aarch64_be && isCompatible a aarch64)
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# PowerPC
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(b == powerpc && isCompatible a powerpc64)
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(b == powerpcle && isCompatible a powerpc)
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(b == powerpc && a == powerpcle)
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(b == powerpc64le && isCompatible a powerpc64)
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(b == powerpc64 && a == powerpc64le)
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# MIPS
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(b == mips && isCompatible a mips64)
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(b == mips && a == mipsel)
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(b == mipsel && isCompatible a mips)
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(b == mips64 && a == mips64el)
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(b == mips64el && isCompatible a mips64)
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# RISCV
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(b == riscv32 && isCompatible a riscv64)
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# SPARC
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(b == sparc && isCompatible a sparc64)
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# WASM
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(b == wasm32 && isCompatible a wasm64)
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# identity
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(b == a)
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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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none = {};
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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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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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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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cygnus = {};
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msvc = {};
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# Note: eabi is specific to ARM and PowerPC.
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# On PowerPC, this corresponds to PPCEABI.
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# On ARM, this corresponds to ARMEABI.
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eabi = { float = "soft"; };
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eabihf = { float = "hard"; };
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# Other architectures should use ELF in embedded situations.
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elf = {};
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androideabi = {};
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android = {
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assertions = [
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{ assertion = platform: !platform.isAarch32;
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message = ''
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The "android" ABI is not for 32-bit ARM. Use "androideabi" instead.
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'';
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}
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];
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};
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gnueabi = { float = "soft"; };
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gnueabihf = { float = "hard"; };
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gnu = {
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assertions = [
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{ assertion = platform: !platform.isAarch32;
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message = ''
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The "gnu" ABI is ambiguous on 32-bit ARM. Use "gnueabi" or "gnueabihf" instead.
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'';
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}
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];
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};
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musleabi = { float = "soft"; };
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musleabihf = { float = "hard"; };
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musl = {};
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uclibceabihf = { float = "soft"; };
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uclibceabi = { float = "hard"; };
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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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"1" = if elemAt l 0 == "avr"
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then { cpu = elemAt l 0; kernel = "none"; abi = "unknown"; }
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else throw "Target specification with 1 components is ambiguous";
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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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# MSVC ought to be the default ABI so this case isn't needed. But then it
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# becomes difficult to handle the gnu* variants for Aarch32 correctly for
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# minGW. So it's easier to make gnu* the default for the MinGW, but
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# hack-in MSVC for the non-MinGW case right here.
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else if elemAt l 1 == "windows"
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then { cpu = elemAt l 0; kernel = "windows"; abi = "msvc"; }
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else if (elemAt l 1) == "elf"
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then { cpu = elemAt l 0; vendor = "unknown"; kernel = "none"; abi = elemAt l 1; }
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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"; }
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else if hasPrefix "netbsd" (elemAt l 2)
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then { cpu = elemAt l 0; vendor = elemAt l 1; kernel = elemAt l 2; }
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else if (elem (elemAt l 2) ["eabi" "eabihf" "elf"])
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then { cpu = elemAt l 0; vendor = "unknown"; kernel = elemAt l 1; abi = elemAt l 2; }
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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 = if hasPrefix "darwin" args.kernel then getKernel "darwin"
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else if hasPrefix "netbsd" args.kernel then getKernel "netbsd"
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else 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 || isWindows parsed then
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if isAarch32 parsed then
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if lib.versionAtLeast (parsed.cpu.version or "0") "6"
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then abis.gnueabihf
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else abis.gnueabi
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else 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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