mirror of
https://github.com/ziglang/zig.git
synced 2025-12-14 10:13:07 +00:00
ba0e3be5cf
The main goal here is to make the function pointers comptime, so that we don't have to do the crazy stuff with async function frames. Since InStream, OutStream, and SeekableStream are already generic across error sets, it's not really worse to make them generic across the vtable as well. See #764 for the open issue acknowledging that using generics for these abstractions is a design flaw. See #130 for the efforts to make these abstractions non-generic. This commit also changes the OutStream API so that `write` returns number of bytes written, and `writeAll` is the one that loops until the whole buffer is written.
642 lines
23 KiB
Zig
642 lines
23 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const util = @import("util.zig");
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const Target = std.Target;
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const fs = std.fs;
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const Allocator = std.mem.Allocator;
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const Batch = std.event.Batch;
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const is_darwin = Target.current.isDarwin();
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const is_windows = Target.current.os.tag == .windows;
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const is_gnu = Target.current.isGnu();
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usingnamespace @import("windows_sdk.zig");
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/// See the render function implementation for documentation of the fields.
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pub const LibCInstallation = struct {
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include_dir: ?[:0]const u8 = null,
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sys_include_dir: ?[:0]const u8 = null,
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crt_dir: ?[:0]const u8 = null,
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static_crt_dir: ?[:0]const u8 = null,
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msvc_lib_dir: ?[:0]const u8 = null,
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kernel32_lib_dir: ?[:0]const u8 = null,
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pub const FindError = error{
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OutOfMemory,
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FileSystem,
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UnableToSpawnCCompiler,
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CCompilerExitCode,
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CCompilerCrashed,
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CCompilerCannotFindHeaders,
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LibCRuntimeNotFound,
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LibCStdLibHeaderNotFound,
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LibCKernel32LibNotFound,
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UnsupportedArchitecture,
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WindowsSdkNotFound,
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};
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pub fn parse(
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allocator: *Allocator,
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libc_file: []const u8,
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stderr: var,
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) !LibCInstallation {
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var self: LibCInstallation = .{};
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const fields = std.meta.fields(LibCInstallation);
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const FoundKey = struct {
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found: bool,
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allocated: ?[:0]u8,
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};
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var found_keys = [1]FoundKey{FoundKey{ .found = false, .allocated = null }} ** fields.len;
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errdefer {
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self = .{};
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for (found_keys) |found_key| {
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if (found_key.allocated) |s| allocator.free(s);
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}
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}
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const contents = try std.io.readFileAlloc(allocator, libc_file);
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defer allocator.free(contents);
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var it = std.mem.tokenize(contents, "\n");
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while (it.next()) |line| {
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if (line.len == 0 or line[0] == '#') continue;
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var line_it = std.mem.separate(line, "=");
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const name = line_it.next() orelse {
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try stderr.print("missing equal sign after field name\n", .{});
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return error.ParseError;
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};
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const value = line_it.rest();
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inline for (fields) |field, i| {
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if (std.mem.eql(u8, name, field.name)) {
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found_keys[i].found = true;
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if (value.len == 0) {
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@field(self, field.name) = null;
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} else {
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found_keys[i].allocated = try std.mem.dupeZ(allocator, u8, value);
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@field(self, field.name) = found_keys[i].allocated;
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}
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break;
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}
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}
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}
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inline for (fields) |field, i| {
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if (!found_keys[i].found) {
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try stderr.print("missing field: {}\n", .{field.name});
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return error.ParseError;
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}
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}
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if (self.include_dir == null) {
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try stderr.print("include_dir may not be empty\n", .{});
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return error.ParseError;
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}
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if (self.sys_include_dir == null) {
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try stderr.print("sys_include_dir may not be empty\n", .{});
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return error.ParseError;
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}
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if (self.crt_dir == null and !is_darwin) {
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try stderr.print("crt_dir may not be empty for {}\n", .{@tagName(Target.current.os.tag)});
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return error.ParseError;
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}
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if (self.static_crt_dir == null and is_windows and is_gnu) {
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try stderr.print("static_crt_dir may not be empty for {}-{}\n", .{
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@tagName(Target.current.os.tag),
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@tagName(Target.current.abi),
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});
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return error.ParseError;
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}
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if (self.msvc_lib_dir == null and is_windows and !is_gnu) {
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try stderr.print("msvc_lib_dir may not be empty for {}-{}\n", .{
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@tagName(Target.current.os.tag),
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@tagName(Target.current.abi),
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});
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return error.ParseError;
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}
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if (self.kernel32_lib_dir == null and is_windows and !is_gnu) {
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try stderr.print("kernel32_lib_dir may not be empty for {}-{}\n", .{
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@tagName(Target.current.os.tag),
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@tagName(Target.current.abi),
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});
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return error.ParseError;
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}
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return self;
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}
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pub fn render(self: LibCInstallation, out: var) !void {
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@setEvalBranchQuota(4000);
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const include_dir = self.include_dir orelse "";
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const sys_include_dir = self.sys_include_dir orelse "";
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const crt_dir = self.crt_dir orelse "";
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const static_crt_dir = self.static_crt_dir orelse "";
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const msvc_lib_dir = self.msvc_lib_dir orelse "";
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const kernel32_lib_dir = self.kernel32_lib_dir orelse "";
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try out.print(
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\\# The directory that contains `stdlib.h`.
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\\# On POSIX-like systems, include directories be found with: `cc -E -Wp,-v -xc /dev/null`
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\\include_dir={}
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\\
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\\# The system-specific include directory. May be the same as `include_dir`.
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\\# On Windows it's the directory that includes `vcruntime.h`.
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\\# On POSIX it's the directory that includes `sys/errno.h`.
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\\sys_include_dir={}
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\\
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\\# The directory that contains `crt1.o` or `crt2.o`.
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\\# On POSIX, can be found with `cc -print-file-name=crt1.o`.
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\\# Not needed when targeting MacOS.
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\\crt_dir={}
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\\
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\\# The directory that contains `crtbegin.o`.
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\\# On POSIX, can be found with `cc -print-file-name=crtbegin.o`.
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\\# Only needed when targeting MinGW-w64 on Windows.
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\\static_crt_dir={}
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\\
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\\# The directory that contains `vcruntime.lib`.
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\\# Only needed when targeting MSVC on Windows.
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\\msvc_lib_dir={}
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\\
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\\# The directory that contains `kernel32.lib`.
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\\# Only needed when targeting MSVC on Windows.
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\\kernel32_lib_dir={}
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\\
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, .{
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include_dir,
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sys_include_dir,
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crt_dir,
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static_crt_dir,
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msvc_lib_dir,
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kernel32_lib_dir,
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});
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}
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pub const FindNativeOptions = struct {
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allocator: *Allocator,
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/// If enabled, will print human-friendly errors to stderr.
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verbose: bool = false,
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};
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/// Finds the default, native libc.
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pub fn findNative(args: FindNativeOptions) FindError!LibCInstallation {
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var self: LibCInstallation = .{};
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if (is_windows) {
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if (is_gnu) {
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var batch = Batch(FindError!void, 3, .auto_async).init();
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batch.add(&async self.findNativeIncludeDirPosix(args));
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batch.add(&async self.findNativeCrtDirPosix(args));
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batch.add(&async self.findNativeStaticCrtDirPosix(args));
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try batch.wait();
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} else {
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var sdk: *ZigWindowsSDK = undefined;
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switch (zig_find_windows_sdk(&sdk)) {
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.None => {
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defer zig_free_windows_sdk(sdk);
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var batch = Batch(FindError!void, 5, .auto_async).init();
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batch.add(&async self.findNativeMsvcIncludeDir(args, sdk));
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batch.add(&async self.findNativeMsvcLibDir(args, sdk));
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batch.add(&async self.findNativeKernel32LibDir(args, sdk));
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batch.add(&async self.findNativeIncludeDirWindows(args, sdk));
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batch.add(&async self.findNativeCrtDirWindows(args, sdk));
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try batch.wait();
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},
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.OutOfMemory => return error.OutOfMemory,
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.NotFound => return error.WindowsSdkNotFound,
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.PathTooLong => return error.WindowsSdkNotFound,
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}
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}
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} else {
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try blk: {
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var batch = Batch(FindError!void, 2, .auto_async).init();
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errdefer batch.wait() catch {};
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batch.add(&async self.findNativeIncludeDirPosix(args));
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switch (Target.current.os.tag) {
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.freebsd, .netbsd => self.crt_dir = try std.mem.dupeZ(args.allocator, u8, "/usr/lib"),
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.linux, .dragonfly => batch.add(&async self.findNativeCrtDirPosix(args)),
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else => {},
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}
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break :blk batch.wait();
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};
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}
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return self;
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}
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/// Must be the same allocator passed to `parse` or `findNative`.
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pub fn deinit(self: *LibCInstallation, allocator: *Allocator) void {
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const fields = std.meta.fields(LibCInstallation);
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inline for (fields) |field| {
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if (@field(self, field.name)) |payload| {
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allocator.free(payload);
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}
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}
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self.* = undefined;
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}
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fn findNativeIncludeDirPosix(self: *LibCInstallation, args: FindNativeOptions) FindError!void {
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const allocator = args.allocator;
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const dev_null = if (is_windows) "nul" else "/dev/null";
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const cc_exe = std.os.getenvZ("CC") orelse default_cc_exe;
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const argv = [_][]const u8{
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cc_exe,
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"-E",
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"-Wp,-v",
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"-xc",
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dev_null,
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};
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const exec_res = std.ChildProcess.exec2(.{
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.allocator = allocator,
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.argv = &argv,
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.max_output_bytes = 1024 * 1024,
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// Some C compilers, such as Clang, are known to rely on argv[0] to find the path
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// to their own executable, without even bothering to resolve PATH. This results in the message:
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// error: unable to execute command: Executable "" doesn't exist!
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// So we use the expandArg0 variant of ChildProcess to give them a helping hand.
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.expand_arg0 = .expand,
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}) catch |err| switch (err) {
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error.OutOfMemory => return error.OutOfMemory,
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else => {
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printVerboseInvocation(&argv, null, args.verbose, null);
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return error.UnableToSpawnCCompiler;
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},
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};
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defer {
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allocator.free(exec_res.stdout);
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allocator.free(exec_res.stderr);
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}
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switch (exec_res.term) {
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.Exited => |code| if (code != 0) {
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printVerboseInvocation(&argv, null, args.verbose, exec_res.stderr);
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return error.CCompilerExitCode;
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},
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else => {
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printVerboseInvocation(&argv, null, args.verbose, exec_res.stderr);
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return error.CCompilerCrashed;
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},
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}
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var it = std.mem.tokenize(exec_res.stderr, "\n\r");
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var search_paths = std.ArrayList([]const u8).init(allocator);
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defer search_paths.deinit();
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while (it.next()) |line| {
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if (line.len != 0 and line[0] == ' ') {
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try search_paths.append(line);
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}
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}
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if (search_paths.len == 0) {
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return error.CCompilerCannotFindHeaders;
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}
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const include_dir_example_file = "stdlib.h";
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const sys_include_dir_example_file = if (is_windows) "sys\\types.h" else "sys/errno.h";
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var path_i: usize = 0;
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while (path_i < search_paths.len) : (path_i += 1) {
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// search in reverse order
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const search_path_untrimmed = search_paths.at(search_paths.len - path_i - 1);
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const search_path = std.mem.trimLeft(u8, search_path_untrimmed, " ");
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var search_dir = fs.cwd().openDirList(search_path) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer search_dir.close();
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if (self.include_dir == null) {
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if (search_dir.accessZ(include_dir_example_file, .{})) |_| {
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self.include_dir = try std.mem.dupeZ(allocator, u8, search_path);
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} else |err| switch (err) {
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error.FileNotFound => {},
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else => return error.FileSystem,
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}
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}
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if (self.sys_include_dir == null) {
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if (search_dir.accessZ(sys_include_dir_example_file, .{})) |_| {
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self.sys_include_dir = try std.mem.dupeZ(allocator, u8, search_path);
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} else |err| switch (err) {
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error.FileNotFound => {},
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else => return error.FileSystem,
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}
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}
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if (self.include_dir != null and self.sys_include_dir != null) {
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// Success.
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return;
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}
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}
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return error.LibCStdLibHeaderNotFound;
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}
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fn findNativeIncludeDirWindows(
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self: *LibCInstallation,
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args: FindNativeOptions,
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sdk: *ZigWindowsSDK,
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) FindError!void {
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const allocator = args.allocator;
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var search_buf: [2]Search = undefined;
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const searches = fillSearch(&search_buf, sdk);
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var result_buf = try std.Buffer.initSize(allocator, 0);
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defer result_buf.deinit();
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for (searches) |search| {
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result_buf.shrink(0);
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const stream = &std.io.BufferOutStream.init(&result_buf).stream;
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try stream.print("{}\\Include\\{}\\ucrt", .{ search.path, search.version });
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var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer dir.close();
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dir.accessZ("stdlib.h", .{}) catch |err| switch (err) {
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error.FileNotFound => continue,
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else => return error.FileSystem,
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};
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self.include_dir = result_buf.toOwnedSlice();
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return;
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}
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return error.LibCStdLibHeaderNotFound;
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}
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fn findNativeCrtDirWindows(
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self: *LibCInstallation,
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args: FindNativeOptions,
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sdk: *ZigWindowsSDK,
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) FindError!void {
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const allocator = args.allocator;
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var search_buf: [2]Search = undefined;
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const searches = fillSearch(&search_buf, sdk);
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var result_buf = try std.Buffer.initSize(allocator, 0);
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defer result_buf.deinit();
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const arch_sub_dir = switch (builtin.arch) {
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.i386 => "x86",
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.x86_64 => "x64",
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.arm, .armeb => "arm",
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else => return error.UnsupportedArchitecture,
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};
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for (searches) |search| {
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result_buf.shrink(0);
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const stream = &std.io.BufferOutStream.init(&result_buf).stream;
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try stream.print("{}\\Lib\\{}\\ucrt\\{}", .{ search.path, search.version, arch_sub_dir });
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var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer dir.close();
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dir.accessZ("ucrt.lib", .{}) catch |err| switch (err) {
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error.FileNotFound => continue,
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else => return error.FileSystem,
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};
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self.crt_dir = result_buf.toOwnedSlice();
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return;
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}
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return error.LibCRuntimeNotFound;
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}
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fn findNativeCrtDirPosix(self: *LibCInstallation, args: FindNativeOptions) FindError!void {
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self.crt_dir = try ccPrintFileName(.{
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.allocator = args.allocator,
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.search_basename = "crt1.o",
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.want_dirname = .only_dir,
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.verbose = args.verbose,
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});
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}
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fn findNativeStaticCrtDirPosix(self: *LibCInstallation, args: FindNativeOptions) FindError!void {
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self.static_crt_dir = try ccPrintFileName(.{
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.allocator = args.allocator,
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.search_basename = "crtbegin.o",
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.want_dirname = .only_dir,
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.verbose = args.verbose,
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});
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}
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|
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fn findNativeKernel32LibDir(
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self: *LibCInstallation,
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args: FindNativeOptions,
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sdk: *ZigWindowsSDK,
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) FindError!void {
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const allocator = args.allocator;
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var search_buf: [2]Search = undefined;
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const searches = fillSearch(&search_buf, sdk);
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var result_buf = try std.Buffer.initSize(allocator, 0);
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defer result_buf.deinit();
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const arch_sub_dir = switch (builtin.arch) {
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.i386 => "x86",
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.x86_64 => "x64",
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.arm, .armeb => "arm",
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else => return error.UnsupportedArchitecture,
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};
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for (searches) |search| {
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result_buf.shrink(0);
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const stream = &std.io.BufferOutStream.init(&result_buf).stream;
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try stream.print("{}\\Lib\\{}\\um\\{}", .{ search.path, search.version, arch_sub_dir });
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var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
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error.FileNotFound,
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error.NotDir,
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error.NoDevice,
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=> continue,
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else => return error.FileSystem,
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};
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defer dir.close();
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dir.accessZ("kernel32.lib", .{}) catch |err| switch (err) {
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error.FileNotFound => continue,
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else => return error.FileSystem,
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};
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|
|
self.kernel32_lib_dir = result_buf.toOwnedSlice();
|
|
return;
|
|
}
|
|
return error.LibCKernel32LibNotFound;
|
|
}
|
|
|
|
fn findNativeMsvcIncludeDir(
|
|
self: *LibCInstallation,
|
|
args: FindNativeOptions,
|
|
sdk: *ZigWindowsSDK,
|
|
) FindError!void {
|
|
const allocator = args.allocator;
|
|
|
|
const msvc_lib_dir_ptr = sdk.msvc_lib_dir_ptr orelse return error.LibCStdLibHeaderNotFound;
|
|
const msvc_lib_dir = msvc_lib_dir_ptr[0..sdk.msvc_lib_dir_len];
|
|
const up1 = fs.path.dirname(msvc_lib_dir) orelse return error.LibCStdLibHeaderNotFound;
|
|
const up2 = fs.path.dirname(up1) orelse return error.LibCStdLibHeaderNotFound;
|
|
|
|
var result_buf = try std.Buffer.init(allocator, up2);
|
|
defer result_buf.deinit();
|
|
|
|
try result_buf.append("\\include");
|
|
|
|
var dir = fs.cwd().openDirList(result_buf.toSliceConst()) catch |err| switch (err) {
|
|
error.FileNotFound,
|
|
error.NotDir,
|
|
error.NoDevice,
|
|
=> return error.LibCStdLibHeaderNotFound,
|
|
|
|
else => return error.FileSystem,
|
|
};
|
|
defer dir.close();
|
|
|
|
dir.accessZ("vcruntime.h", .{}) catch |err| switch (err) {
|
|
error.FileNotFound => return error.LibCStdLibHeaderNotFound,
|
|
else => return error.FileSystem,
|
|
};
|
|
|
|
self.sys_include_dir = result_buf.toOwnedSlice();
|
|
}
|
|
|
|
fn findNativeMsvcLibDir(
|
|
self: *LibCInstallation,
|
|
args: FindNativeOptions,
|
|
sdk: *ZigWindowsSDK,
|
|
) FindError!void {
|
|
const allocator = args.allocator;
|
|
const msvc_lib_dir_ptr = sdk.msvc_lib_dir_ptr orelse return error.LibCRuntimeNotFound;
|
|
self.msvc_lib_dir = try std.mem.dupeZ(allocator, u8, msvc_lib_dir_ptr[0..sdk.msvc_lib_dir_len]);
|
|
}
|
|
};
|
|
|
|
const default_cc_exe = if (is_windows) "cc.exe" else "cc";
|
|
|
|
pub const CCPrintFileNameOptions = struct {
|
|
allocator: *Allocator,
|
|
search_basename: []const u8,
|
|
want_dirname: enum { full_path, only_dir },
|
|
verbose: bool = false,
|
|
};
|
|
|
|
/// caller owns returned memory
|
|
fn ccPrintFileName(args: CCPrintFileNameOptions) ![:0]u8 {
|
|
const allocator = args.allocator;
|
|
|
|
const cc_exe = std.os.getenvZ("CC") orelse default_cc_exe;
|
|
const arg1 = try std.fmt.allocPrint(allocator, "-print-file-name={}", .{args.search_basename});
|
|
defer allocator.free(arg1);
|
|
const argv = [_][]const u8{ cc_exe, arg1 };
|
|
|
|
const exec_res = std.ChildProcess.exec2(.{
|
|
.allocator = allocator,
|
|
.argv = &argv,
|
|
.max_output_bytes = 1024 * 1024,
|
|
// Some C compilers, such as Clang, are known to rely on argv[0] to find the path
|
|
// to their own executable, without even bothering to resolve PATH. This results in the message:
|
|
// error: unable to execute command: Executable "" doesn't exist!
|
|
// So we use the expandArg0 variant of ChildProcess to give them a helping hand.
|
|
.expand_arg0 = .expand,
|
|
}) catch |err| switch (err) {
|
|
error.OutOfMemory => return error.OutOfMemory,
|
|
else => return error.UnableToSpawnCCompiler,
|
|
};
|
|
defer {
|
|
allocator.free(exec_res.stdout);
|
|
allocator.free(exec_res.stderr);
|
|
}
|
|
switch (exec_res.term) {
|
|
.Exited => |code| if (code != 0) {
|
|
printVerboseInvocation(&argv, args.search_basename, args.verbose, exec_res.stderr);
|
|
return error.CCompilerExitCode;
|
|
},
|
|
else => {
|
|
printVerboseInvocation(&argv, args.search_basename, args.verbose, exec_res.stderr);
|
|
return error.CCompilerCrashed;
|
|
},
|
|
}
|
|
|
|
var it = std.mem.tokenize(exec_res.stdout, "\n\r");
|
|
const line = it.next() orelse return error.LibCRuntimeNotFound;
|
|
// When this command fails, it returns exit code 0 and duplicates the input file name.
|
|
// So we detect failure by checking if the output matches exactly the input.
|
|
if (std.mem.eql(u8, line, args.search_basename)) return error.LibCRuntimeNotFound;
|
|
switch (args.want_dirname) {
|
|
.full_path => return std.mem.dupeZ(allocator, u8, line),
|
|
.only_dir => {
|
|
const dirname = fs.path.dirname(line) orelse return error.LibCRuntimeNotFound;
|
|
return std.mem.dupeZ(allocator, u8, dirname);
|
|
},
|
|
}
|
|
}
|
|
|
|
fn printVerboseInvocation(
|
|
argv: []const []const u8,
|
|
search_basename: ?[]const u8,
|
|
verbose: bool,
|
|
stderr: ?[]const u8,
|
|
) void {
|
|
if (!verbose) return;
|
|
|
|
if (search_basename) |s| {
|
|
std.debug.warn("Zig attempted to find the file '{}' by executing this command:\n", .{s});
|
|
} else {
|
|
std.debug.warn("Zig attempted to find the path to native system libc headers by executing this command:\n", .{});
|
|
}
|
|
for (argv) |arg, i| {
|
|
if (i != 0) std.debug.warn(" ", .{});
|
|
std.debug.warn("{}", .{arg});
|
|
}
|
|
std.debug.warn("\n", .{});
|
|
if (stderr) |s| {
|
|
std.debug.warn("Output:\n==========\n{}\n==========\n", .{s});
|
|
}
|
|
}
|
|
|
|
const Search = struct {
|
|
path: []const u8,
|
|
version: []const u8,
|
|
};
|
|
|
|
fn fillSearch(search_buf: *[2]Search, sdk: *ZigWindowsSDK) []Search {
|
|
var search_end: usize = 0;
|
|
if (sdk.path10_ptr) |path10_ptr| {
|
|
if (sdk.version10_ptr) |version10_ptr| {
|
|
search_buf[search_end] = Search{
|
|
.path = path10_ptr[0..sdk.path10_len],
|
|
.version = version10_ptr[0..sdk.version10_len],
|
|
};
|
|
search_end += 1;
|
|
}
|
|
}
|
|
if (sdk.path81_ptr) |path81_ptr| {
|
|
if (sdk.version81_ptr) |version81_ptr| {
|
|
search_buf[search_end] = Search{
|
|
.path = path81_ptr[0..sdk.path81_len],
|
|
.version = version81_ptr[0..sdk.version81_len],
|
|
};
|
|
search_end += 1;
|
|
}
|
|
}
|
|
return search_buf[0..search_end];
|
|
}
|