577 lines
20 KiB
Zig
577 lines
20 KiB
Zig
const std = @import("std");
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const mem = std.mem;
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const c = @import("c.zig");
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const Compilation = @import("compilation.zig").Compilation;
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const Target = std.Target;
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const ObjectFormat = Target.ObjectFormat;
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const LibCInstallation = @import("libc_installation.zig").LibCInstallation;
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const assert = std.debug.assert;
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const util = @import("util.zig");
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const Context = struct {
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comp: *Compilation,
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arena: std.heap.ArenaAllocator,
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args: std.ArrayList([*:0]const u8),
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link_in_crt: bool,
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link_err: error{OutOfMemory}!void,
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link_msg: std.Buffer,
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libc: *LibCInstallation,
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out_file_path: std.Buffer,
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};
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pub fn link(comp: *Compilation) !void {
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var ctx = Context{
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.comp = comp,
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.arena = std.heap.ArenaAllocator.init(comp.gpa()),
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.args = undefined,
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.link_in_crt = comp.haveLibC() and comp.kind == .Exe,
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.link_err = {},
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.link_msg = undefined,
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.libc = undefined,
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.out_file_path = undefined,
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};
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defer ctx.arena.deinit();
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ctx.args = std.ArrayList([*:0]const u8).init(&ctx.arena.allocator);
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ctx.link_msg = std.Buffer.initNull(&ctx.arena.allocator);
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ctx.out_file_path = try std.Buffer.init(&ctx.arena.allocator, comp.name.toSliceConst());
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switch (comp.kind) {
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.Exe => {
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try ctx.out_file_path.append(comp.target.exeFileExt());
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},
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.Lib => {
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try ctx.out_file_path.append(if (comp.is_static) comp.target.staticLibSuffix() else comp.target.dynamicLibSuffix());
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},
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.Obj => {
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try ctx.out_file_path.append(comp.target.oFileExt());
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},
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}
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// even though we're calling LLD as a library it thinks the first
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// argument is its own exe name
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try ctx.args.append("lld");
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if (comp.haveLibC()) {
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// TODO https://github.com/ziglang/zig/issues/3190
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var libc = ctx.comp.override_libc orelse blk: {
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@panic("this code has bitrotted");
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//switch (comp.target) {
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// Target.Native => {
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// break :blk comp.zig_compiler.getNativeLibC() catch return error.LibCRequiredButNotProvidedOrFound;
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// },
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// else => return error.LibCRequiredButNotProvidedOrFound,
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//}
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};
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ctx.libc = libc;
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}
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try constructLinkerArgs(&ctx);
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if (comp.verbose_link) {
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for (ctx.args.toSliceConst()) |arg, i| {
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const space = if (i == 0) "" else " ";
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std.debug.warn("{}{s}", .{ space, arg });
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}
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std.debug.warn("\n", .{});
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}
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const extern_ofmt = toExternObjectFormatType(comp.target.getObjectFormat());
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const args_slice = ctx.args.toSlice();
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{
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// LLD is not thread-safe, so we grab a global lock.
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const held = comp.zig_compiler.lld_lock.acquire();
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defer held.release();
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// Not evented I/O. LLD does its own multithreading internally.
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if (!ZigLLDLink(extern_ofmt, args_slice.ptr, args_slice.len, linkDiagCallback, @ptrCast(*c_void, &ctx))) {
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if (!ctx.link_msg.isNull()) {
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// TODO capture these messages and pass them through the system, reporting them through the
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// event system instead of printing them directly here.
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// perhaps try to parse and understand them.
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std.debug.warn("{}\n", .{ctx.link_msg.toSliceConst()});
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}
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return error.LinkFailed;
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}
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}
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}
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extern fn ZigLLDLink(
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oformat: c.ZigLLVM_ObjectFormatType,
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args: [*]const [*]const u8,
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arg_count: usize,
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append_diagnostic: extern fn (*c_void, [*]const u8, usize) void,
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context: *c_void,
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) bool;
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fn linkDiagCallback(context: *c_void, ptr: [*]const u8, len: usize) callconv(.C) void {
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const ctx = @ptrCast(*Context, @alignCast(@alignOf(Context), context));
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ctx.link_err = linkDiagCallbackErrorable(ctx, ptr[0..len]);
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}
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fn linkDiagCallbackErrorable(ctx: *Context, msg: []const u8) !void {
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if (ctx.link_msg.isNull()) {
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try ctx.link_msg.resize(0);
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}
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try ctx.link_msg.append(msg);
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}
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fn toExternObjectFormatType(ofmt: ObjectFormat) c.ZigLLVM_ObjectFormatType {
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return switch (ofmt) {
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.unknown => .ZigLLVM_UnknownObjectFormat,
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.coff => .ZigLLVM_COFF,
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.elf => .ZigLLVM_ELF,
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.macho => .ZigLLVM_MachO,
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.wasm => .ZigLLVM_Wasm,
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};
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}
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fn constructLinkerArgs(ctx: *Context) !void {
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switch (ctx.comp.target.getObjectFormat()) {
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.unknown => unreachable,
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.coff => return constructLinkerArgsCoff(ctx),
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.elf => return constructLinkerArgsElf(ctx),
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.macho => return constructLinkerArgsMachO(ctx),
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.wasm => return constructLinkerArgsWasm(ctx),
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}
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}
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fn constructLinkerArgsElf(ctx: *Context) !void {
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// TODO commented out code in this function
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//if (g->linker_script) {
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// lj->args.append("-T");
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// lj->args.append(g->linker_script);
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//}
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try ctx.args.append("--gc-sections");
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if (ctx.comp.link_eh_frame_hdr) {
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try ctx.args.append("--eh-frame-hdr");
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}
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//lj->args.append("-m");
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//lj->args.append(getLDMOption(&g->zig_target));
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//bool is_lib = g->out_type == OutTypeLib;
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//bool shared = !g->is_static && is_lib;
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//Buf *soname = nullptr;
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if (ctx.comp.is_static) {
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//if (util.isArmOrThumb(ctx.comp.target)) {
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// try ctx.args.append("-Bstatic");
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//} else {
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// try ctx.args.append("-static");
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//}
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}
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//} else if (shared) {
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// lj->args.append("-shared");
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// if (buf_len(&lj->out_file) == 0) {
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// buf_appendf(&lj->out_file, "lib%s.so.%" ZIG_PRI_usize ".%" ZIG_PRI_usize ".%" ZIG_PRI_usize "",
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// buf_ptr(g->root_out_name), g->version_major, g->version_minor, g->version_patch);
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// }
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// soname = buf_sprintf("lib%s.so.%" ZIG_PRI_usize "", buf_ptr(g->root_out_name), g->version_major);
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//}
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try ctx.args.append("-o");
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try ctx.args.append(ctx.out_file_path.toSliceConst());
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if (ctx.link_in_crt) {
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const crt1o = if (ctx.comp.is_static) "crt1.o" else "Scrt1.o";
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try addPathJoin(ctx, ctx.libc.crt_dir.?, crt1o);
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try addPathJoin(ctx, ctx.libc.crt_dir.?, "crti.o");
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}
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if (ctx.comp.haveLibC()) {
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try ctx.args.append("-L");
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// TODO addNullByte should probably return [:0]u8
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try ctx.args.append(@ptrCast([*:0]const u8, (try std.cstr.addNullByte(&ctx.arena.allocator, ctx.libc.crt_dir.?)).ptr));
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//if (!ctx.comp.is_static) {
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// const dl = blk: {
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// //if (ctx.libc.dynamic_linker_path) |dl| break :blk dl;
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// //if (util.getDynamicLinkerPath(ctx.comp.target)) |dl| break :blk dl;
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// return error.LibCMissingDynamicLinker;
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// };
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// try ctx.args.append("-dynamic-linker");
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// try ctx.args.append(@ptrCast([*:0]const u8, (try std.cstr.addNullByte(&ctx.arena.allocator, dl)).ptr));
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//}
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}
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//if (shared) {
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// lj->args.append("-soname");
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// lj->args.append(buf_ptr(soname));
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//}
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// .o files
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for (ctx.comp.link_objects) |link_object| {
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const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
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try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
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}
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try addFnObjects(ctx);
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//if (g->out_type == OutTypeExe || g->out_type == OutTypeLib) {
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// if (g->libc_link_lib == nullptr) {
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// Buf *builtin_o_path = build_o(g, "builtin");
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// lj->args.append(buf_ptr(builtin_o_path));
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// }
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// // sometimes libgcc is missing stuff, so we still build compiler_rt and rely on weak linkage
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// Buf *compiler_rt_o_path = build_compiler_rt(g);
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// lj->args.append(buf_ptr(compiler_rt_o_path));
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//}
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//for (size_t i = 0; i < g->link_libs_list.length; i += 1) {
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// LinkLib *link_lib = g->link_libs_list.at(i);
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// if (buf_eql_str(link_lib->name, "c")) {
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// continue;
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// }
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// Buf *arg;
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// if (buf_starts_with_str(link_lib->name, "/") || buf_ends_with_str(link_lib->name, ".a") ||
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// buf_ends_with_str(link_lib->name, ".so"))
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// {
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// arg = link_lib->name;
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// } else {
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// arg = buf_sprintf("-l%s", buf_ptr(link_lib->name));
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// }
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// lj->args.append(buf_ptr(arg));
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//}
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// libc dep
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if (ctx.comp.haveLibC()) {
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if (ctx.comp.is_static) {
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try ctx.args.append("--start-group");
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try ctx.args.append("-lgcc");
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try ctx.args.append("-lgcc_eh");
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try ctx.args.append("-lc");
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try ctx.args.append("-lm");
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try ctx.args.append("--end-group");
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} else {
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try ctx.args.append("-lgcc");
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try ctx.args.append("--as-needed");
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try ctx.args.append("-lgcc_s");
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try ctx.args.append("--no-as-needed");
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try ctx.args.append("-lc");
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try ctx.args.append("-lm");
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try ctx.args.append("-lgcc");
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try ctx.args.append("--as-needed");
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try ctx.args.append("-lgcc_s");
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try ctx.args.append("--no-as-needed");
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}
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}
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// crt end
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if (ctx.link_in_crt) {
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try addPathJoin(ctx, ctx.libc.crt_dir.?, "crtn.o");
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}
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//if (ctx.comp.target != Target.Native) {
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// try ctx.args.append("--allow-shlib-undefined");
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//}
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}
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fn addPathJoin(ctx: *Context, dirname: []const u8, basename: []const u8) !void {
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const full_path = try std.fs.path.join(&ctx.arena.allocator, &[_][]const u8{ dirname, basename });
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const full_path_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, full_path);
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try ctx.args.append(@ptrCast([*:0]const u8, full_path_with_null.ptr));
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}
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fn constructLinkerArgsCoff(ctx: *Context) !void {
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try ctx.args.append("-NOLOGO");
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if (!ctx.comp.strip) {
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try ctx.args.append("-DEBUG");
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}
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switch (ctx.comp.target.cpu.arch) {
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.i386 => try ctx.args.append("-MACHINE:X86"),
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.x86_64 => try ctx.args.append("-MACHINE:X64"),
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.aarch64 => try ctx.args.append("-MACHINE:ARM"),
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else => return error.UnsupportedLinkArchitecture,
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}
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const is_library = ctx.comp.kind == .Lib;
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const out_arg = try std.fmt.allocPrint(&ctx.arena.allocator, "-OUT:{}\x00", .{ctx.out_file_path.toSliceConst()});
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try ctx.args.append(@ptrCast([*:0]const u8, out_arg.ptr));
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if (ctx.comp.haveLibC()) {
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try ctx.args.append(@ptrCast([*:0]const u8, (try std.fmt.allocPrint(&ctx.arena.allocator, "-LIBPATH:{}\x00", .{ctx.libc.msvc_lib_dir.?})).ptr));
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try ctx.args.append(@ptrCast([*:0]const u8, (try std.fmt.allocPrint(&ctx.arena.allocator, "-LIBPATH:{}\x00", .{ctx.libc.kernel32_lib_dir.?})).ptr));
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try ctx.args.append(@ptrCast([*:0]const u8, (try std.fmt.allocPrint(&ctx.arena.allocator, "-LIBPATH:{}\x00", .{ctx.libc.crt_dir.?})).ptr));
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}
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if (ctx.link_in_crt) {
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const lib_str = if (ctx.comp.is_static) "lib" else "";
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const d_str = if (ctx.comp.build_mode == .Debug) "d" else "";
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if (ctx.comp.is_static) {
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const cmt_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "libcmt{}.lib\x00", .{d_str});
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try ctx.args.append(@ptrCast([*:0]const u8, cmt_lib_name.ptr));
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} else {
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const msvcrt_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "msvcrt{}.lib\x00", .{d_str});
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try ctx.args.append(@ptrCast([*:0]const u8, msvcrt_lib_name.ptr));
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}
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const vcruntime_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "{}vcruntime{}.lib\x00", .{
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lib_str,
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d_str,
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});
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try ctx.args.append(@ptrCast([*:0]const u8, vcruntime_lib_name.ptr));
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const crt_lib_name = try std.fmt.allocPrint(&ctx.arena.allocator, "{}ucrt{}.lib\x00", .{ lib_str, d_str });
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try ctx.args.append(@ptrCast([*:0]const u8, crt_lib_name.ptr));
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// Visual C++ 2015 Conformance Changes
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// https://msdn.microsoft.com/en-us/library/bb531344.aspx
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try ctx.args.append("legacy_stdio_definitions.lib");
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// msvcrt depends on kernel32
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try ctx.args.append("kernel32.lib");
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} else {
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try ctx.args.append("-NODEFAULTLIB");
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if (!is_library) {
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try ctx.args.append("-ENTRY:WinMainCRTStartup");
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}
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}
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if (is_library and !ctx.comp.is_static) {
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try ctx.args.append("-DLL");
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}
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for (ctx.comp.link_objects) |link_object| {
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const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
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try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
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}
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try addFnObjects(ctx);
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switch (ctx.comp.kind) {
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.Exe, .Lib => {
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if (!ctx.comp.haveLibC()) {
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@panic("TODO");
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}
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},
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.Obj => {},
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}
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}
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fn constructLinkerArgsMachO(ctx: *Context) !void {
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try ctx.args.append("-demangle");
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if (ctx.comp.linker_rdynamic) {
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try ctx.args.append("-export_dynamic");
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}
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const is_lib = ctx.comp.kind == .Lib;
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const shared = !ctx.comp.is_static and is_lib;
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if (ctx.comp.is_static) {
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try ctx.args.append("-static");
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} else {
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try ctx.args.append("-dynamic");
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}
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try ctx.args.append("-arch");
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try ctx.args.append(util.getDarwinArchString(ctx.comp.target));
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const platform = try DarwinPlatform.get(ctx.comp);
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switch (platform.kind) {
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.MacOS => try ctx.args.append("-macosx_version_min"),
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.IPhoneOS => try ctx.args.append("-iphoneos_version_min"),
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.IPhoneOSSimulator => try ctx.args.append("-ios_simulator_version_min"),
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}
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const ver_str = try std.fmt.allocPrint(&ctx.arena.allocator, "{}.{}.{}\x00", .{
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platform.major,
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platform.minor,
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platform.micro,
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});
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try ctx.args.append(@ptrCast([*:0]const u8, ver_str.ptr));
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if (ctx.comp.kind == .Exe) {
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if (ctx.comp.is_static) {
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try ctx.args.append("-no_pie");
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} else {
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try ctx.args.append("-pie");
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}
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}
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try ctx.args.append("-o");
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try ctx.args.append(ctx.out_file_path.toSliceConst());
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if (shared) {
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try ctx.args.append("-headerpad_max_install_names");
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} else if (ctx.comp.is_static) {
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try ctx.args.append("-lcrt0.o");
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} else {
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switch (platform.kind) {
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.MacOS => {
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if (platform.versionLessThan(10, 5)) {
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try ctx.args.append("-lcrt1.o");
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} else if (platform.versionLessThan(10, 6)) {
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try ctx.args.append("-lcrt1.10.5.o");
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} else if (platform.versionLessThan(10, 8)) {
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try ctx.args.append("-lcrt1.10.6.o");
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}
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},
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.IPhoneOS => {
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if (ctx.comp.target.cpu.arch == .aarch64) {
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// iOS does not need any crt1 files for arm64
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} else if (platform.versionLessThan(3, 1)) {
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try ctx.args.append("-lcrt1.o");
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} else if (platform.versionLessThan(6, 0)) {
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try ctx.args.append("-lcrt1.3.1.o");
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}
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},
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.IPhoneOSSimulator => {}, // no crt1.o needed
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}
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}
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for (ctx.comp.link_objects) |link_object| {
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const link_obj_with_null = try std.cstr.addNullByte(&ctx.arena.allocator, link_object);
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try ctx.args.append(@ptrCast([*:0]const u8, link_obj_with_null.ptr));
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}
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try addFnObjects(ctx);
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// TODO
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//if (ctx.comp.target == Target.Native) {
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// for (ctx.comp.link_libs_list.toSliceConst()) |lib| {
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// if (mem.eql(u8, lib.name, "c")) {
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// // on Darwin, libSystem has libc in it, but also you have to use it
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// // to make syscalls because the syscall numbers are not documented
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// // and change between versions.
|
|
// // so we always link against libSystem
|
|
// try ctx.args.append("-lSystem");
|
|
// } else {
|
|
// if (mem.indexOfScalar(u8, lib.name, '/') == null) {
|
|
// const arg = try std.fmt.allocPrint(&ctx.arena.allocator, "-l{}\x00", .{lib.name});
|
|
// try ctx.args.append(@ptrCast([*:0]const u8, arg.ptr));
|
|
// } else {
|
|
// const arg = try std.cstr.addNullByte(&ctx.arena.allocator, lib.name);
|
|
// try ctx.args.append(@ptrCast([*:0]const u8, arg.ptr));
|
|
// }
|
|
// }
|
|
// }
|
|
//} else {
|
|
// try ctx.args.append("-undefined");
|
|
// try ctx.args.append("dynamic_lookup");
|
|
//}
|
|
|
|
if (platform.kind == .MacOS) {
|
|
if (platform.versionLessThan(10, 5)) {
|
|
try ctx.args.append("-lgcc_s.10.4");
|
|
} else if (platform.versionLessThan(10, 6)) {
|
|
try ctx.args.append("-lgcc_s.10.5");
|
|
}
|
|
} else {
|
|
@panic("TODO");
|
|
}
|
|
}
|
|
|
|
fn constructLinkerArgsWasm(ctx: *Context) void {
|
|
@panic("TODO");
|
|
}
|
|
|
|
fn addFnObjects(ctx: *Context) !void {
|
|
const held = ctx.comp.fn_link_set.acquire();
|
|
defer held.release();
|
|
|
|
var it = held.value.first;
|
|
while (it) |node| {
|
|
const fn_val = node.data orelse {
|
|
// handle the tombstone. See Value.Fn.destroy.
|
|
it = node.next;
|
|
held.value.remove(node);
|
|
ctx.comp.gpa().destroy(node);
|
|
continue;
|
|
};
|
|
try ctx.args.append(fn_val.containing_object.toSliceConst());
|
|
it = node.next;
|
|
}
|
|
}
|
|
|
|
const DarwinPlatform = struct {
|
|
kind: Kind,
|
|
major: u32,
|
|
minor: u32,
|
|
micro: u32,
|
|
|
|
const Kind = enum {
|
|
MacOS,
|
|
IPhoneOS,
|
|
IPhoneOSSimulator,
|
|
};
|
|
|
|
fn get(comp: *Compilation) !DarwinPlatform {
|
|
var result: DarwinPlatform = undefined;
|
|
const ver_str = switch (comp.darwin_version_min) {
|
|
.MacOS => |ver| blk: {
|
|
result.kind = .MacOS;
|
|
break :blk ver;
|
|
},
|
|
.Ios => |ver| blk: {
|
|
result.kind = .IPhoneOS;
|
|
break :blk ver;
|
|
},
|
|
.None => blk: {
|
|
assert(comp.target.os.tag == .macosx);
|
|
result.kind = .MacOS;
|
|
break :blk "10.14";
|
|
},
|
|
};
|
|
|
|
var had_extra: bool = undefined;
|
|
try darwinGetReleaseVersion(
|
|
ver_str,
|
|
&result.major,
|
|
&result.minor,
|
|
&result.micro,
|
|
&had_extra,
|
|
);
|
|
if (had_extra or result.major != 10 or result.minor >= 100 or result.micro >= 100) {
|
|
return error.InvalidDarwinVersionString;
|
|
}
|
|
|
|
if (result.kind == .IPhoneOS) {
|
|
switch (comp.target.cpu.arch) {
|
|
.i386,
|
|
.x86_64,
|
|
=> result.kind = .IPhoneOSSimulator,
|
|
else => {},
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
fn versionLessThan(self: DarwinPlatform, major: u32, minor: u32) bool {
|
|
if (self.major < major)
|
|
return true;
|
|
if (self.major > major)
|
|
return false;
|
|
if (self.minor < minor)
|
|
return true;
|
|
return false;
|
|
}
|
|
};
|
|
|
|
/// Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
|
|
/// grouped values as integers. Numbers which are not provided are set to 0.
|
|
/// return true if the entire string was parsed (9.2), or all groups were
|
|
/// parsed (10.3.5extrastuff).
|
|
fn darwinGetReleaseVersion(str: []const u8, major: *u32, minor: *u32, micro: *u32, had_extra: *bool) !void {
|
|
major.* = 0;
|
|
minor.* = 0;
|
|
micro.* = 0;
|
|
had_extra.* = false;
|
|
|
|
if (str.len == 0)
|
|
return error.InvalidDarwinVersionString;
|
|
|
|
var start_pos: usize = 0;
|
|
for ([_]*u32{ major, minor, micro }) |v| {
|
|
const dot_pos = mem.indexOfScalarPos(u8, str, start_pos, '.');
|
|
const end_pos = dot_pos orelse str.len;
|
|
v.* = std.fmt.parseUnsigned(u32, str[start_pos..end_pos], 10) catch return error.InvalidDarwinVersionString;
|
|
start_pos = (dot_pos orelse return) + 1;
|
|
if (start_pos == str.len) return;
|
|
}
|
|
had_extra.* = true;
|
|
}
|