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const std = @import("std");
const Step = std.Build.Step;
const fs = std.fs;
const mem = std.mem;
const TranslateC = @This();
pub const base_id = .translate_c;
step: Step,
source: std.Build.LazyPath,
include_dirs: std.ArrayList([]const u8),
c_macros: std.ArrayList([]const u8),
out_basename: []const u8,
target: std.Build.ResolvedTarget,
optimize: std.builtin.OptimizeMode,
output_file: std.Build.GeneratedFile,
link_libc: bool,
use_clang: bool,
pub const Options = struct {
root_source_file: std.Build.LazyPath,
target: std.Build.ResolvedTarget,
optimize: std.builtin.OptimizeMode,
link_libc: bool = true,
use_clang: bool = true,
};
pub fn create(owner: *std.Build, options: Options) *TranslateC {
const self = owner.allocator.create(TranslateC) catch @panic("OOM");
const source = options.root_source_file.dupe(owner);
self.* = TranslateC{
.step = Step.init(.{
.id = .translate_c,
.name = "translate-c",
.owner = owner,
.makeFn = make,
}),
.source = source,
.include_dirs = std.ArrayList([]const u8).init(owner.allocator),
.c_macros = std.ArrayList([]const u8).init(owner.allocator),
.out_basename = undefined,
.target = options.target,
.optimize = options.optimize,
.output_file = std.Build.GeneratedFile{ .step = &self.step },
.link_libc = options.link_libc,
.use_clang = options.use_clang,
};
source.addStepDependencies(&self.step);
return self;
}
pub const AddExecutableOptions = struct {
name: ?[]const u8 = null,
version: ?std.SemanticVersion = null,
target: ?std.Build.ResolvedTarget = null,
optimize: ?std.builtin.OptimizeMode = null,
linkage: ?std.builtin.LinkMode = null,
};
pub fn getOutput(self: *TranslateC) std.Build.LazyPath {
return .{ .generated = &self.output_file };
}
/// Creates a step to build an executable from the translated source.
pub fn addExecutable(self: *TranslateC, options: AddExecutableOptions) *Step.Compile {
return self.step.owner.addExecutable(.{
.root_source_file = self.getOutput(),
.name = options.name orelse "translated_c",
.version = options.version,
.target = options.target orelse self.target,
.optimize = options.optimize orelse self.optimize,
.linkage = options.linkage,
});
}
/// Creates a module from the translated source and adds it to the package's
/// module set making it available to other packages which depend on this one.
/// `createModule` can be used instead to create a private module.
pub fn addModule(self: *TranslateC, name: []const u8) *std.Build.Module {
return self.step.owner.addModule(name, .{
.root_source_file = self.getOutput(),
});
}
/// Creates a private module from the translated source to be used by the
/// current package, but not exposed to other packages depending on this one.
/// `addModule` can be used instead to create a public module.
pub fn createModule(self: *TranslateC) *std.Build.Module {
return self.step.owner.createModule(.{
.root_source_file = self.getOutput(),
});
}
pub fn addIncludeDir(self: *TranslateC, include_dir: []const u8) void {
self.include_dirs.append(self.step.owner.dupePath(include_dir)) catch @panic("OOM");
}
pub fn addCheckFile(self: *TranslateC, expected_matches: []const []const u8) *Step.CheckFile {
return Step.CheckFile.create(
self.step.owner,
self.getOutput(),
.{ .expected_matches = expected_matches },
);
}
/// If the value is omitted, it is set to 1.
/// `name` and `value` need not live longer than the function call.
pub fn defineCMacro(self: *TranslateC, name: []const u8, value: ?[]const u8) void {
const macro = std.Build.constructCMacro(self.step.owner.allocator, name, value);
self.c_macros.append(macro) catch @panic("OOM");
}
/// name_and_value looks like [name]=[value]. If the value is omitted, it is set to 1.
pub fn defineCMacroRaw(self: *TranslateC, name_and_value: []const u8) void {
self.c_macros.append(self.step.owner.dupe(name_and_value)) catch @panic("OOM");
}
fn make(step: *Step, prog_node: *std.Progress.Node) !void {
const b = step.owner;
const self: *TranslateC = @fieldParentPtr("step", step);
var argv_list = std.ArrayList([]const u8).init(b.allocator);
try argv_list.append(b.graph.zig_exe);
try argv_list.append("translate-c");
if (self.link_libc) {
try argv_list.append("-lc");
}
if (!self.use_clang) {
try argv_list.append("-fno-clang");
}
try argv_list.append("--listen=-");
if (!self.target.query.isNative()) {
try argv_list.append("-target");
try argv_list.append(try self.target.query.zigTriple(b.allocator));
}
switch (self.optimize) {
.Debug => {}, // Skip since it's the default.
else => try argv_list.append(b.fmt("-O{s}", .{@tagName(self.optimize)})),
}
for (self.include_dirs.items) |include_dir| {
try argv_list.append("-I");
try argv_list.append(include_dir);
}
for (self.c_macros.items) |c_macro| {
try argv_list.append("-D");
try argv_list.append(c_macro);
}
try argv_list.append(self.source.getPath(b));
const output_path = try step.evalZigProcess(argv_list.items, prog_node);
self.out_basename = fs.path.basename(output_path.?);
const output_dir = fs.path.dirname(output_path.?).?;
self.output_file.path = try fs.path.join(
b.allocator,
&[_][]const u8{ output_dir, self.out_basename },
);
}
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