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 )
174 lines
6.4 KiB
Nix
174 lines
6.4 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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{ 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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setTypesAssert = type: pred:
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mapAttrs (name: value:
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assert pred value;
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setType type ({ inherit name; } // value));
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setTypes = type: setTypesAssert type (_: true);
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in
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rec {
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isSignificantByte = isType "significant-byte";
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significantBytes = setTypes "significant-byte" {
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bigEndian = {};
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littleEndian = {};
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};
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isCpuType = isType "cpu-type";
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cpuTypes = with significantBytes; setTypesAssert "cpu-type"
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(x: elem x.bits [8 16 32 64 128]
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&& (if 8 < x.bits
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then isSignificantByte x.significantByte
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else !(x ? significantByte)))
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{
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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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armv6l = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv7a = { bits = 32; significantByte = littleEndian; family = "arm"; };
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armv7l = { bits = 32; significantByte = littleEndian; family = "arm"; };
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aarch64 = { bits = 64; significantByte = littleEndian; family = "aarch64"; };
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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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mips64el = { bits = 32; significantByte = littleEndian; family = "mips"; };
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powerpc = { bits = 32; significantByte = bigEndian; family = "power"; };
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};
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isVendor = isType "vendor";
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vendors = setTypes "vendor" {
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apple = {};
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pc = {};
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unknown = {};
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};
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isExecFormat = isType "exec-format";
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execFormats = setTypes "exec-format" {
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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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isKernelFamily = isType "kernel-family";
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kernelFamilies = setTypes "kernel-family" {
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bsd = {};
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};
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isKernel = x: isType "kernel" x;
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kernels = with execFormats; with kernelFamilies; setTypesAssert "kernel"
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(x: isExecFormat x.execFormat && all isKernelFamily (attrValues x.families))
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{
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darwin = { execFormat = macho; families = { }; };
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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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# TODO(@Ericson2314): Handle these Darwin version suffixes more generally.
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darwin10 = kernels.darwin;
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darwin14 = kernels.darwin;
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win32 = kernels.windows;
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};
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isAbi = isType "abi";
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abis = setTypes "abi" {
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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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unknown = {};
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};
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isSystem = isType "system";
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mkSystem = { cpu, vendor, kernel, abi }:
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assert isCpuType cpu && isVendor vendor && isKernel kernel && isAbi abi;
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setType "system" {
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inherit cpu vendor kernel abi;
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};
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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: ${name}");
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parsed = rec {
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cpu = getCpu args.cpu;
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vendor =
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/**/ if args ? vendor then getVendor args.vendor
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else if isDarwin parsed then vendors.apple
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else if isWindows parsed then vendors.pc
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else vendors.unknown;
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kernel = getKernel args.kernel;
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abi =
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/**/ if args ? abi then getAbi args.abi
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else if isLinux parsed then abis.gnu
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else if isWindows parsed then abis.gnu
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else abis.unknown;
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};
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in mkSystem parsed;
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mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (lib.splitString "-" s));
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doubleFromSystem = { cpu, vendor, kernel, abi, ... }:
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if abi == abis.cygnus
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then "${cpu.name}-cygwin"
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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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