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2275 lines (2236 loc) · 79.3 KB
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const std = @import("std");
const Allocator = std.mem.Allocator;
const mem = std.mem;
const path = std.fs.path;
const assert = std.debug.assert;
const target_util = @import("target.zig");
const Compilation = @import("Compilation.zig");
const build_options = @import("build_options");
pub const CRTFile = enum {
crti_o,
crtn_o,
crt1_o,
rcrt1_o,
scrt1_o,
libc_a,
libc_so,
};
pub fn buildCRTFile(comp: *Compilation, crt_file: CRTFile) !void {
if (!build_options.have_llvm) {
return error.ZigCompilerNotBuiltWithLLVMExtensions;
}
const gpa = comp.gpa;
var arena_allocator = std.heap.ArenaAllocator.init(gpa);
defer arena_allocator.deinit();
const arena = arena_allocator.allocator();
switch (crt_file) {
.crti_o => {
var args = std.ArrayList([]const u8).init(arena);
try addCcArgs(comp, arena, &args, false);
try args.appendSlice(&[_][]const u8{
"-Qunused-arguments",
});
return comp.build_crt_file("crti", .Obj, &[1]Compilation.CSourceFile{
.{
.src_path = try start_asm_path(comp, arena, "crti.s"),
.extra_flags = args.items,
},
});
},
.crtn_o => {
var args = std.ArrayList([]const u8).init(arena);
try addCcArgs(comp, arena, &args, false);
try args.appendSlice(&[_][]const u8{
"-Qunused-arguments",
});
return comp.build_crt_file("crtn", .Obj, &[1]Compilation.CSourceFile{
.{
.src_path = try start_asm_path(comp, arena, "crtn.s"),
.extra_flags = args.items,
},
});
},
.crt1_o => {
var args = std.ArrayList([]const u8).init(arena);
try addCcArgs(comp, arena, &args, false);
try args.appendSlice(&[_][]const u8{
"-fno-stack-protector",
"-DCRT",
});
return comp.build_crt_file("crt1", .Obj, &[1]Compilation.CSourceFile{
.{
.src_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{
"libc", "musl", "crt", "crt1.c",
}),
.extra_flags = args.items,
},
});
},
.rcrt1_o => {
var args = std.ArrayList([]const u8).init(arena);
try addCcArgs(comp, arena, &args, false);
try args.appendSlice(&[_][]const u8{
"-fPIC",
"-fno-stack-protector",
"-DCRT",
});
return comp.build_crt_file("rcrt1", .Obj, &[1]Compilation.CSourceFile{
.{
.src_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{
"libc", "musl", "crt", "rcrt1.c",
}),
.extra_flags = args.items,
},
});
},
.scrt1_o => {
var args = std.ArrayList([]const u8).init(arena);
try addCcArgs(comp, arena, &args, false);
try args.appendSlice(&[_][]const u8{
"-fPIC",
"-fno-stack-protector",
"-DCRT",
});
return comp.build_crt_file("Scrt1", .Obj, &[1]Compilation.CSourceFile{
.{
.src_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{
"libc", "musl", "crt", "Scrt1.c",
}),
.extra_flags = args.items,
},
});
},
.libc_a => {
// When there is a src/<arch>/foo.* then it should substitute for src/foo.*
// Even a .s file can substitute for a .c file.
const target = comp.getTarget();
const arch_name = archName(target.cpu.arch);
var source_table = std.StringArrayHashMap(Ext).init(comp.gpa);
defer source_table.deinit();
try source_table.ensureTotalCapacity(compat_time32_files.len + src_files.len);
for (src_files) |src_file| {
try addSrcFile(arena, &source_table, src_file);
}
const time32_compat_arch_list = [_][]const u8{ "arm", "i386", "mips", "powerpc" };
for (time32_compat_arch_list) |time32_compat_arch| {
if (mem.eql(u8, arch_name, time32_compat_arch)) {
for (compat_time32_files) |compat_time32_file| {
try addSrcFile(arena, &source_table, compat_time32_file);
}
}
}
var c_source_files = std.ArrayList(Compilation.CSourceFile).init(comp.gpa);
defer c_source_files.deinit();
var override_path = std.ArrayList(u8).init(comp.gpa);
defer override_path.deinit();
const s = path.sep_str;
var it = source_table.iterator();
while (it.next()) |entry| {
const src_file = entry.key_ptr.*;
const ext = entry.value_ptr.*;
const dirname = path.dirname(src_file).?;
const basename = path.basename(src_file);
const noextbasename = basename[0 .. basename.len - std.fs.path.extension(basename).len];
const dirbasename = path.basename(dirname);
var is_arch_specific = false;
// Architecture-specific implementations are under a <arch>/ folder.
if (isMuslArchName(dirbasename)) {
if (!mem.eql(u8, dirbasename, arch_name))
continue; // Not the architecture we're compiling for.
is_arch_specific = true;
}
if (!is_arch_specific) {
// Look for an arch specific override.
override_path.shrinkRetainingCapacity(0);
try override_path.writer().print("{s}" ++ s ++ "{s}" ++ s ++ "{s}.s", .{
dirname, arch_name, noextbasename,
});
if (source_table.contains(override_path.items))
continue;
override_path.shrinkRetainingCapacity(0);
try override_path.writer().print("{s}" ++ s ++ "{s}" ++ s ++ "{s}.S", .{
dirname, arch_name, noextbasename,
});
if (source_table.contains(override_path.items))
continue;
override_path.shrinkRetainingCapacity(0);
try override_path.writer().print("{s}" ++ s ++ "{s}" ++ s ++ "{s}.c", .{
dirname, arch_name, noextbasename,
});
if (source_table.contains(override_path.items))
continue;
}
var args = std.ArrayList([]const u8).init(arena);
try addCcArgs(comp, arena, &args, ext == .o3);
try args.appendSlice(&[_][]const u8{
"-Qunused-arguments",
"-w", // disable all warnings
});
const c_source_file = try c_source_files.addOne();
c_source_file.* = .{
.src_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", src_file }),
.extra_flags = args.items,
};
}
return comp.build_crt_file("c", .Lib, c_source_files.items);
},
.libc_so => {
const target = comp.getTarget();
const arch_define = try std.fmt.allocPrint(arena, "-DARCH_{s}", .{
@tagName(target.cpu.arch),
});
const clang_argv: []const []const u8 = if (target.cpu.arch.ptrBitWidth() == 64)
&[_][]const u8{ "-DPTR64", arch_define }
else
&[_][]const u8{arch_define};
const sub_compilation = try Compilation.create(comp.gpa, .{
.local_cache_directory = comp.global_cache_directory,
.global_cache_directory = comp.global_cache_directory,
.cache_mode = .whole,
.zig_lib_directory = comp.zig_lib_directory,
.target = target,
.root_name = "c",
.main_pkg = null,
.output_mode = .Lib,
.link_mode = .Dynamic,
.thread_pool = comp.thread_pool,
.libc_installation = comp.bin_file.options.libc_installation,
.emit_bin = Compilation.EmitLoc{ .directory = null, .basename = "libc.so" },
.optimize_mode = comp.compilerRtOptMode(),
.want_sanitize_c = false,
.want_stack_check = false,
.want_red_zone = comp.bin_file.options.red_zone,
.omit_frame_pointer = comp.bin_file.options.omit_frame_pointer,
.want_valgrind = false,
.want_tsan = false,
.emit_h = null,
.strip = comp.compilerRtStrip(),
.is_native_os = false,
.is_native_abi = false,
.self_exe_path = comp.self_exe_path,
.verbose_cc = comp.verbose_cc,
.verbose_link = comp.bin_file.options.verbose_link,
.verbose_air = comp.verbose_air,
.verbose_llvm_ir = comp.verbose_llvm_ir,
.verbose_cimport = comp.verbose_cimport,
.verbose_llvm_cpu_features = comp.verbose_llvm_cpu_features,
.clang_passthrough_mode = comp.clang_passthrough_mode,
.c_source_files = &[_]Compilation.CSourceFile{
.{ .src_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "musl", "libc.S" }) },
},
.clang_argv = clang_argv,
.skip_linker_dependencies = true,
.soname = "libc.so",
});
defer sub_compilation.destroy();
try sub_compilation.updateSubCompilation();
try comp.crt_files.ensureUnusedCapacity(comp.gpa, 1);
const basename = try comp.gpa.dupe(u8, "libc.so");
errdefer comp.gpa.free(basename);
comp.crt_files.putAssumeCapacityNoClobber(basename, .{
.full_object_path = try sub_compilation.bin_file.options.emit.?.directory.join(comp.gpa, &[_][]const u8{
sub_compilation.bin_file.options.emit.?.sub_path,
}),
.lock = sub_compilation.bin_file.toOwnedLock(),
});
},
}
}
pub fn archName(arch: std.Target.Cpu.Arch) [:0]const u8 {
switch (arch) {
.aarch64, .aarch64_be => return "aarch64",
.arm, .armeb, .thumb, .thumbeb => return "arm",
.i386 => return "i386",
.mips, .mipsel => return "mips",
.mips64el, .mips64 => return "mips64",
.powerpc => return "powerpc",
.powerpc64, .powerpc64le => return "powerpc64",
.riscv64 => return "riscv64",
.s390x => return "s390x",
.wasm32, .wasm64 => return "wasm",
.x86_64 => return "x86_64",
else => unreachable,
}
}
// Return true if musl has arch-specific crti/crtn sources.
// See lib/libc/musl/crt/ARCH/crt?.s .
pub fn needsCrtiCrtn(target: std.Target) bool {
// zig fmt: off
return switch (target.cpu.arch) {
.riscv64,
.wasm32, .wasm64 => return false,
else => true,
};
// zig fmt: on
}
fn isMuslArchName(name: []const u8) bool {
const musl_arch_names = [_][]const u8{
"aarch64",
"arm",
"generic",
"i386",
"m68k",
"microblaze",
"mips",
"mips64",
"mipsn32",
"or1k",
"powerpc",
"powerpc64",
"riscv64",
"s390x",
"sh",
"x32",
"x86_64",
};
for (musl_arch_names) |musl_arch_name| {
if (mem.eql(u8, musl_arch_name, name)) {
return true;
}
}
return false;
}
const Ext = enum {
assembly,
normal,
o3,
};
fn addSrcFile(arena: Allocator, source_table: *std.StringArrayHashMap(Ext), file_path: []const u8) !void {
const ext: Ext = ext: {
if (mem.endsWith(u8, file_path, ".c")) {
if (mem.startsWith(u8, file_path, "musl/src/malloc/") or
mem.startsWith(u8, file_path, "musl/src/string/") or
mem.startsWith(u8, file_path, "musl/src/internal/"))
{
break :ext .o3;
} else {
break :ext .assembly;
}
} else if (mem.endsWith(u8, file_path, ".s") or mem.endsWith(u8, file_path, ".S")) {
break :ext .assembly;
} else {
unreachable;
}
};
// TODO do this at comptime on the comptime data rather than at runtime
// probably best to wait until self-hosted is done and our comptime execution
// is faster and uses less memory.
const key = if (path.sep != '/') blk: {
const mutable_file_path = try arena.dupe(u8, file_path);
for (mutable_file_path) |*c| {
if (c.* == '/') {
c.* = path.sep;
}
}
break :blk mutable_file_path;
} else file_path;
source_table.putAssumeCapacityNoClobber(key, ext);
}
fn addCcArgs(
comp: *Compilation,
arena: Allocator,
args: *std.ArrayList([]const u8),
want_O3: bool,
) error{OutOfMemory}!void {
const target = comp.getTarget();
const arch_name = archName(target.cpu.arch);
const os_name = @tagName(target.os.tag);
const triple = try std.fmt.allocPrint(arena, "{s}-{s}-musl", .{ arch_name, os_name });
const o_arg = if (want_O3) "-O3" else "-Os";
try args.appendSlice(&[_][]const u8{
"-std=c99",
"-ffreestanding",
// Musl adds these args to builds with gcc but clang does not support them.
//"-fexcess-precision=standard",
//"-frounding-math",
"-Wa,--noexecstack",
"-D_XOPEN_SOURCE=700",
"-I",
try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "musl", "arch", arch_name }),
"-I",
try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "musl", "arch", "generic" }),
"-I",
try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "musl", "src", "include" }),
"-I",
try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "musl", "src", "internal" }),
"-I",
try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "musl", "include" }),
"-I",
try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "include", triple }),
"-I",
try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "include", "generic-musl" }),
o_arg,
"-fomit-frame-pointer",
"-fno-unwind-tables",
"-fno-asynchronous-unwind-tables",
"-ffunction-sections",
"-fdata-sections",
});
}
fn start_asm_path(comp: *Compilation, arena: Allocator, basename: []const u8) ![]const u8 {
const target = comp.getTarget();
return comp.zig_lib_directory.join(arena, &[_][]const u8{
"libc", "musl", "crt", archName(target.cpu.arch), basename,
});
}
const src_files = [_][]const u8{
<
10BC8
div id="LC416" class="react-file-line html-div" data-testid="code-cell" data-line-number="416" style="position:relative"> "musl/src/aio/aio.c",
"musl/src/aio/aio_suspend.c",
"musl/src/aio/lio_listio.c",
"musl/src/complex/__cexp.c",
"musl/src/complex/__cexpf.c",
"musl/src/complex/cabs.c",
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"musl/src/math/exp2.c",
"musl/src/math/exp2f.c",
"musl/src/math/exp2f_data.c",
"musl/src/math/exp2l.c",
"musl/src/math/exp_data.c",
"musl/src/math/expf.c",
"musl/src/math/expl.c",
"musl/src/math/expm1.c",
"musl/src/math/expm1f.c",
"musl/src/math/expm1l.c",
"musl/src/math/fabs.c",
"musl/src/math/fabsf.c",
"musl/src/math/fabsl.c",
"musl/src/math/fdim.c",
"musl/src/math/fdimf.c",
"musl/src/math/fdiml.c",
"musl/src/math/finite.c",
"musl/src/math/finitef.c",
"musl/src/math/floor.c",
"musl/src/math/floorf.c",
"musl/src/math/floorl.c",
"musl/src/math/fma.c",
"musl/src/math/fmaf.c",
"musl/src/math/fmal.c",
"musl/src/math/fmax.c",
"musl/src/math/fmaxf.c",
"musl/src/math/fmaxl.c",
"musl/src/math/fmin.c",
"musl/src/math/fminf.c",
"musl/src/math/fminl.c",
"musl/src/math/fmod.c",
"musl/src/math/fmodf.c",
"musl/src/math/fmodl.c",
"musl/src/math/frexp.c",
"musl/src/math/frexpf.c",
"musl/src/math/frexpl.c",
"musl/src/math/hypot.c",
"musl/src/math/hypotf.c",
"musl/src/math/hypotl.c",
"musl/src/math/i386/__invtrigl.s",
"musl/src/math/i386/acos.s",
"musl/src/math/i386/acosf.s",
"musl/src/math/i386/acosl.s",
"musl/src/math/i386/asin.s",
"musl/src/math/i386/asinf.s",
"musl/src/math/i386/asinl.s",
"musl/src/math/i386/atan.s",
"musl/src/math/i386/atan2.s",
"musl/src/math/i386/atan2f.s",
"musl/src/math/i386/atan2l.s",
"musl/src/math/i386/atanf.s",
"musl/src/math/i386/atanl.s",
"musl/src/math/i386/ceil.s",
"musl/src/math/i386/ceilf.s",
"musl/src/math/i386/ceill.s",
"musl/src/math/i386/exp2l.s",
"musl/src/math/i386/exp_ld.s",
"musl/src/math/i386/expl.s",
"musl/src/math/i386/expm1l.s",
"musl/src/math/i386/fabs.c",
"musl/src/math/i386/fabsf.c",
"musl/src/math/i386/fabsl.c",
"musl/src/math/i386/floor.s",
"musl/src/math/i386/floorf.s",
"musl/src/math/i386/floorl.s",
"musl/src/math/i386/fmod.c",
"musl/src/math/i386/fmodf.c",
"musl/src/math/i386/fmodl.c",
"musl/src/math/i386/hypot.s",
"musl/src/math/i386/hypotf.s",
"musl/src/math/i386/ldexp.s",
"musl/src/math/i386/ldexpf.s",
"musl/src/math/i386/ldexpl.s",
"musl/src/math/i386/llrint.c",
"musl/src/math/i386/llrintf.c",
"musl/src/math/i386/llrintl.c",
"musl/src/math/i386/log.s",
"musl/src/math/i386/log10.s",
"musl/src/math/i386/log10f.s",
"musl/src/math/i386/log10l.s",
"musl/src/math/i386/log1p.s",
"musl/src/math/i386/log1pf.s",
"musl/src/math/i386/log1pl.s",
"musl/src/math/i386/log2.s",
"musl/src/math/i386/log2f.s",
"musl/src/math/i386/log2l.s",
"musl/src/math/i386/logf.s",
"musl/src/math/i386/logl.s",
"musl/src/math/i386/lrint.c",
"musl/src/math/i386/lrintf.c",
"musl/src/math/i386/lrintl.c",
"musl/src/math/i386/remainder.c",
"musl/src/math/i386/remainderf.c",
"musl/src/math/i386/remainderl.c",
"musl/src/math/i386/remquo.s",
"musl/src/math/i386/remquof.s",