214 lines
8.1 KiB
Zig
214 lines
8.1 KiB
Zig
const root = @import("@build");
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const std = @import("std");
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const builtin = @import("builtin");
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const io = std.io;
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const fmt = std.fmt;
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const os = std.os;
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const Builder = std.build.Builder;
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const mem = std.mem;
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const ArrayList = std.ArrayList;
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const warn = std.debug.warn;
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pub fn main() !void {
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var arg_it = os.args();
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// Here we use an ArenaAllocator backed by a DirectAllocator because a build is a short-lived,
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// one shot program. We don't need to waste time freeing memory and finding places to squish
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// bytes into. So we free everything all at once at the very end.
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var direct_allocator = std.heap.DirectAllocator.init();
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defer direct_allocator.deinit();
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var arena = std.heap.ArenaAllocator.init(&direct_allocator.allocator);
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defer arena.deinit();
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const allocator = &arena.allocator;
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// skip my own exe name
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_ = arg_it.skip();
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const zig_exe = try unwrapArg(arg_it.next(allocator) orelse {
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warn("Expected first argument to be path to zig compiler\n");
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return error.InvalidArgs;
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});
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const build_root = try unwrapArg(arg_it.next(allocator) orelse {
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warn("Expected second argument to be build root directory path\n");
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return error.InvalidArgs;
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});
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const cache_root = try unwrapArg(arg_it.next(allocator) orelse {
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warn("Expected third argument to be cache root directory path\n");
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return error.InvalidArgs;
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});
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var builder = Builder.init(allocator, zig_exe, build_root, cache_root);
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defer builder.deinit();
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var targets = ArrayList([]const u8).init(allocator);
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var prefix: ?[]const u8 = null;
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var stderr_file = io.getStdErr();
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var stderr_file_stream: io.FileOutStream = undefined;
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var stderr_stream = if (stderr_file) |*f| x: {
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stderr_file_stream = io.FileOutStream.init(f);
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break :x &stderr_file_stream.stream;
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} else |err| err;
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var stdout_file = io.getStdOut();
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var stdout_file_stream: io.FileOutStream = undefined;
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var stdout_stream = if (stdout_file) |*f| x: {
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stdout_file_stream = io.FileOutStream.init(f);
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break :x &stdout_file_stream.stream;
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} else |err| err;
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while (arg_it.next(allocator)) |err_or_arg| {
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const arg = try unwrapArg(err_or_arg);
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if (mem.startsWith(u8, arg, "-D")) {
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const option_contents = arg[2..];
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if (option_contents.len == 0) {
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warn("Expected option name after '-D'\n\n");
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return usageAndErr(&builder, false, try stderr_stream);
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}
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if (mem.indexOfScalar(u8, option_contents, '=')) |name_end| {
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const option_name = option_contents[0..name_end];
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const option_value = option_contents[name_end + 1 ..];
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if (builder.addUserInputOption(option_name, option_value))
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return usageAndErr(&builder, false, try stderr_stream);
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} else {
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if (builder.addUserInputFlag(option_contents))
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return usageAndErr(&builder, false, try stderr_stream);
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}
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} else if (mem.startsWith(u8, arg, "-")) {
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if (mem.eql(u8, arg, "--verbose")) {
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builder.verbose = true;
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} else if (mem.eql(u8, arg, "--help")) {
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return usage(&builder, false, try stdout_stream);
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} else if (mem.eql(u8, arg, "--prefix")) {
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prefix = try unwrapArg(arg_it.next(allocator) orelse {
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warn("Expected argument after --prefix\n\n");
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return usageAndErr(&builder, false, try stderr_stream);
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});
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} else if (mem.eql(u8, arg, "--search-prefix")) {
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const search_prefix = try unwrapArg(arg_it.next(allocator) orelse {
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warn("Expected argument after --search-prefix\n\n");
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return usageAndErr(&builder, false, try stderr_stream);
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});
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builder.addSearchPrefix(search_prefix);
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} else if (mem.eql(u8, arg, "--verbose-tokenize")) {
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builder.verbose_tokenize = true;
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} else if (mem.eql(u8, arg, "--verbose-ast")) {
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builder.verbose_ast = true;
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} else if (mem.eql(u8, arg, "--verbose-link")) {
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builder.verbose_link = true;
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} else if (mem.eql(u8, arg, "--verbose-ir")) {
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builder.verbose_ir = true;
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} else if (mem.eql(u8, arg, "--verbose-llvm-ir")) {
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builder.verbose_llvm_ir = true;
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} else if (mem.eql(u8, arg, "--verbose-cimport")) {
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builder.verbose_cimport = true;
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} else {
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warn("Unrecognized argument: {}\n\n", arg);
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return usageAndErr(&builder, false, try stderr_stream);
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}
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} else {
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try targets.append(arg);
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}
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}
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builder.setInstallPrefix(prefix);
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try runBuild(&builder);
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if (builder.validateUserInputDidItFail())
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return usageAndErr(&builder, true, try stderr_stream);
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builder.make(targets.toSliceConst()) catch |err| {
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switch (err) {
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error.InvalidStepName => {
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return usageAndErr(&builder, true, try stderr_stream);
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},
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error.UncleanExit => os.exit(1),
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else => return err,
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}
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};
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}
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fn runBuild(builder: *Builder) error!void {
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switch (@typeId(@typeOf(root.build).ReturnType)) {
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builtin.TypeId.Void => root.build(builder),
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builtin.TypeId.ErrorUnion => try root.build(builder),
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else => @compileError("expected return type of build to be 'void' or '!void'"),
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}
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}
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fn usage(builder: *Builder, already_ran_build: bool, out_stream: var) !void {
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// run the build script to collect the options
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if (!already_ran_build) {
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builder.setInstallPrefix(null);
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try runBuild(builder);
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}
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// This usage text has to be synchronized with src/main.cpp
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try out_stream.print(
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\\Usage: {} build [steps] [options]
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\\
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\\Steps:
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\\
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, builder.zig_exe);
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const allocator = builder.allocator;
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for (builder.top_level_steps.toSliceConst()) |top_level_step| {
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try out_stream.print(" {s22} {}\n", top_level_step.step.name, top_level_step.description);
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}
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try out_stream.write(
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\\
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\\General Options:
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\\ --help Print this help and exit
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\\ --init Generate a build.zig template
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\\ --verbose Print commands before executing them
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\\ --prefix [path] Override default install prefix
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\\ --search-prefix [path] Add a path to look for binaries, libraries, headers
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\\
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\\Project-Specific Options:
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\\
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);
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if (builder.available_options_list.len == 0) {
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try out_stream.print(" (none)\n");
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} else {
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for (builder.available_options_list.toSliceConst()) |option| {
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const name = try fmt.allocPrint(allocator, " -D{}=[{}]", option.name, Builder.typeIdName(option.type_id));
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defer allocator.free(name);
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try out_stream.print("{s24} {}\n", name, option.description);
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}
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}
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try out_stream.write(
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\\
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\\Advanced Options:
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\\ --build-file [file] Override path to build.zig
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\\ --cache-dir [path] Override path to zig cache directory
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\\ --verbose-tokenize Enable compiler debug output for tokenization
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\\ --verbose-ast Enable compiler debug output for parsing into an AST
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\\ --verbose-link Enable compiler debug output for linking
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\\ --verbose-ir Enable compiler debug output for Zig IR
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\\ --verbose-llvm-ir Enable compiler debug output for LLVM IR
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\\ --verbose-cimport Enable compiler debug output for C imports
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\\
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);
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}
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fn usageAndErr(builder: *Builder, already_ran_build: bool, out_stream: var) error {
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usage(builder, already_ran_build, out_stream) catch {};
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return error.InvalidArgs;
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}
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const UnwrapArgError = error{OutOfMemory};
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fn unwrapArg(arg: UnwrapArgError![]u8) UnwrapArgError![]u8 {
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return arg catch |err| {
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warn("Unable to parse command line: {}\n", err);
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return err;
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};
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}
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