mirror of
https://github.com/ziglang/zig.git
synced 2024-11-15 16:45:27 +00:00
642 lines
24 KiB
Zig
642 lines
24 KiB
Zig
// This file is included in the compilation unit when exporting an executable.
|
|
|
|
const root = @import("root");
|
|
const std = @import("std.zig");
|
|
const builtin = @import("builtin");
|
|
const assert = std.debug.assert;
|
|
const uefi = std.os.uefi;
|
|
const elf = std.elf;
|
|
const native_arch = builtin.cpu.arch;
|
|
const native_os = builtin.os.tag;
|
|
|
|
const start_sym_name = if (native_arch.isMIPS()) "__start" else "_start";
|
|
|
|
// The self-hosted compiler is not fully capable of handling all of this start.zig file.
|
|
// Until then, we have simplified logic here for self-hosted. TODO remove this once
|
|
// self-hosted is capable enough to handle all of the real start.zig logic.
|
|
pub const simplified_logic =
|
|
builtin.zig_backend == .stage2_x86 or
|
|
builtin.zig_backend == .stage2_aarch64 or
|
|
builtin.zig_backend == .stage2_arm or
|
|
builtin.zig_backend == .stage2_sparc64 or
|
|
builtin.cpu.arch == .spirv32 or
|
|
builtin.cpu.arch == .spirv64;
|
|
|
|
comptime {
|
|
// No matter what, we import the root file, so that any export, test, comptime
|
|
// decls there get run.
|
|
_ = root;
|
|
|
|
if (simplified_logic) {
|
|
if (builtin.output_mode == .Exe) {
|
|
if ((builtin.link_libc or builtin.object_format == .c) and @hasDecl(root, "main")) {
|
|
if (@typeInfo(@TypeOf(root.main)).Fn.calling_convention != .C) {
|
|
@export(main2, .{ .name = "main" });
|
|
}
|
|
} else if (builtin.os.tag == .windows) {
|
|
if (!@hasDecl(root, "wWinMainCRTStartup") and !@hasDecl(root, "mainCRTStartup")) {
|
|
@export(wWinMainCRTStartup2, .{ .name = "wWinMainCRTStartup" });
|
|
}
|
|
} else if (builtin.os.tag == .opencl) {
|
|
if (@hasDecl(root, "main"))
|
|
@export(spirvMain2, .{ .name = "main" });
|
|
} else {
|
|
if (!@hasDecl(root, "_start")) {
|
|
@export(_start2, .{ .name = "_start" });
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (builtin.output_mode == .Lib and builtin.link_mode == .dynamic) {
|
|
if (native_os == .windows and !@hasDecl(root, "_DllMainCRTStartup")) {
|
|
@export(_DllMainCRTStartup, .{ .name = "_DllMainCRTStartup" });
|
|
}
|
|
} else if (builtin.output_mode == .Exe or @hasDecl(root, "main")) {
|
|
if (builtin.link_libc and @hasDecl(root, "main")) {
|
|
if (native_arch.isWasm()) {
|
|
@export(mainWithoutEnv, .{ .name = "main" });
|
|
} else if (@typeInfo(@TypeOf(root.main)).Fn.calling_convention != .C) {
|
|
@export(main, .{ .name = "main" });
|
|
}
|
|
} else if (native_os == .windows) {
|
|
if (!@hasDecl(root, "WinMain") and !@hasDecl(root, "WinMainCRTStartup") and
|
|
!@hasDecl(root, "wWinMain") and !@hasDecl(root, "wWinMainCRTStartup"))
|
|
{
|
|
@export(WinStartup, .{ .name = "wWinMainCRTStartup" });
|
|
} else if (@hasDecl(root, "WinMain") and !@hasDecl(root, "WinMainCRTStartup") and
|
|
!@hasDecl(root, "wWinMain") and !@hasDecl(root, "wWinMainCRTStartup"))
|
|
{
|
|
@compileError("WinMain not supported; declare wWinMain or main instead");
|
|
} else if (@hasDecl(root, "wWinMain") and !@hasDecl(root, "wWinMainCRTStartup") and
|
|
!@hasDecl(root, "WinMain") and !@hasDecl(root, "WinMainCRTStartup"))
|
|
{
|
|
@export(wWinMainCRTStartup, .{ .name = "wWinMainCRTStartup" });
|
|
}
|
|
} else if (native_os == .uefi) {
|
|
if (!@hasDecl(root, "EfiMain")) @export(EfiMain, .{ .name = "EfiMain" });
|
|
} else if (native_os == .wasi) {
|
|
const wasm_start_sym = switch (builtin.wasi_exec_model) {
|
|
.reactor => "_initialize",
|
|
.command => "_start",
|
|
};
|
|
if (!@hasDecl(root, wasm_start_sym) and @hasDecl(root, "main")) {
|
|
// Only call main when defined. For WebAssembly it's allowed to pass `-fno-entry` in which
|
|
// case it's not required to provide an entrypoint such as main.
|
|
@export(wasi_start, .{ .name = wasm_start_sym });
|
|
}
|
|
} else if (native_arch.isWasm() and native_os == .freestanding) {
|
|
// Only call main when defined. For WebAssembly it's allowed to pass `-fno-entry` in which
|
|
// case it's not required to provide an entrypoint such as main.
|
|
if (!@hasDecl(root, start_sym_name) and @hasDecl(root, "main")) @export(wasm_freestanding_start, .{ .name = start_sym_name });
|
|
} else if (native_os != .other and native_os != .freestanding) {
|
|
if (!@hasDecl(root, start_sym_name)) @export(_start, .{ .name = start_sym_name });
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Simplified start code for stage2 until it supports more language features ///
|
|
|
|
fn main2() callconv(.C) c_int {
|
|
root.main();
|
|
return 0;
|
|
}
|
|
|
|
fn _start2() callconv(.C) noreturn {
|
|
callMain2();
|
|
}
|
|
|
|
fn callMain2() noreturn {
|
|
@setAlignStack(16);
|
|
root.main();
|
|
exit2(0);
|
|
}
|
|
|
|
fn spirvMain2() callconv(.Kernel) void {
|
|
root.main();
|
|
}
|
|
|
|
fn wWinMainCRTStartup2() callconv(.C) noreturn {
|
|
root.main();
|
|
exit2(0);
|
|
}
|
|
|
|
fn exit2(code: usize) noreturn {
|
|
switch (native_os) {
|
|
.linux => switch (builtin.cpu.arch) {
|
|
.x86_64 => {
|
|
asm volatile ("syscall"
|
|
:
|
|
: [number] "{rax}" (231),
|
|
[arg1] "{rdi}" (code),
|
|
: "rcx", "r11", "memory"
|
|
);
|
|
},
|
|
.arm => {
|
|
asm volatile ("svc #0"
|
|
:
|
|
: [number] "{r7}" (1),
|
|
[arg1] "{r0}" (code),
|
|
: "memory"
|
|
);
|
|
},
|
|
.aarch64 => {
|
|
asm volatile ("svc #0"
|
|
:
|
|
: [number] "{x8}" (93),
|
|
[arg1] "{x0}" (code),
|
|
: "memory", "cc"
|
|
);
|
|
},
|
|
.sparc64 => {
|
|
asm volatile ("ta 0x6d"
|
|
:
|
|
: [number] "{g1}" (1),
|
|
[arg1] "{o0}" (code),
|
|
: "o0", "o1", "o2", "o3", "o4", "o5", "o6", "o7", "memory"
|
|
);
|
|
},
|
|
else => @compileError("TODO"),
|
|
},
|
|
// exits(0)
|
|
.plan9 => std.os.plan9.exits(null),
|
|
.windows => {
|
|
std.os.windows.ntdll.RtlExitUserProcess(@as(u32, @truncate(code)));
|
|
},
|
|
else => @compileError("TODO"),
|
|
}
|
|
unreachable;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
fn _DllMainCRTStartup(
|
|
hinstDLL: std.os.windows.HINSTANCE,
|
|
fdwReason: std.os.windows.DWORD,
|
|
lpReserved: std.os.windows.LPVOID,
|
|
) callconv(std.os.windows.WINAPI) std.os.windows.BOOL {
|
|
if (!builtin.single_threaded and !builtin.link_libc) {
|
|
_ = @import("start_windows_tls.zig");
|
|
}
|
|
|
|
if (@hasDecl(root, "DllMain")) {
|
|
return root.DllMain(hinstDLL, fdwReason, lpReserved);
|
|
}
|
|
|
|
return std.os.windows.TRUE;
|
|
}
|
|
|
|
fn wasm_freestanding_start() callconv(.C) void {
|
|
// This is marked inline because for some reason LLVM in
|
|
// release mode fails to inline it, and we want fewer call frames in stack traces.
|
|
_ = @call(.always_inline, callMain, .{});
|
|
}
|
|
|
|
fn wasi_start() callconv(.C) void {
|
|
// The function call is marked inline because for some reason LLVM in
|
|
// release mode fails to inline it, and we want fewer call frames in stack traces.
|
|
switch (builtin.wasi_exec_model) {
|
|
.reactor => _ = @call(.always_inline, callMain, .{}),
|
|
.command => std.os.wasi.proc_exit(@call(.always_inline, callMain, .{})),
|
|
}
|
|
}
|
|
|
|
fn EfiMain(handle: uefi.Handle, system_table: *uefi.tables.SystemTable) callconv(.C) usize {
|
|
uefi.handle = handle;
|
|
uefi.system_table = system_table;
|
|
|
|
switch (@typeInfo(@TypeOf(root.main)).Fn.return_type.?) {
|
|
noreturn => {
|
|
root.main();
|
|
},
|
|
void => {
|
|
root.main();
|
|
return 0;
|
|
},
|
|
usize => {
|
|
return root.main();
|
|
},
|
|
uefi.Status => {
|
|
return @intFromEnum(root.main());
|
|
},
|
|
else => @compileError("expected return type of main to be 'void', 'noreturn', 'usize', or 'std.os.uefi.Status'"),
|
|
}
|
|
}
|
|
|
|
fn _start() callconv(.Naked) noreturn {
|
|
// TODO set Top of Stack on non x86_64-plan9
|
|
if (native_os == .plan9 and native_arch == .x86_64) {
|
|
// from /sys/src/libc/amd64/main9.s
|
|
std.os.plan9.tos = asm volatile (""
|
|
: [tos] "={rax}" (-> *std.os.plan9.Tos),
|
|
);
|
|
}
|
|
|
|
// Note that we maintain a very low level of trust with regards to ABI guarantees at this point.
|
|
// We will redundantly align the stack, clear the link register, etc. While e.g. the Linux
|
|
// kernel is usually good about upholding the ABI guarantees, the same cannot be said of dynamic
|
|
// linkers; musl's ldso, for example, opts to not align the stack when invoking the dynamic
|
|
// linker explicitly.
|
|
asm volatile (switch (native_arch) {
|
|
.x86_64 =>
|
|
\\ xorl %%ebp, %%ebp
|
|
\\ movq %%rsp, %%rdi
|
|
\\ andq $-16, %%rsp
|
|
\\ callq %[posixCallMainAndExit:P]
|
|
,
|
|
.x86 =>
|
|
\\ xorl %%ebp, %%ebp
|
|
\\ movl %%esp, %%eax
|
|
\\ andl $-16, %%esp
|
|
\\ subl $12, %%esp
|
|
\\ pushl %%eax
|
|
\\ calll %[posixCallMainAndExit:P]
|
|
,
|
|
.aarch64, .aarch64_be =>
|
|
\\ mov fp, #0
|
|
\\ mov lr, #0
|
|
\\ mov x0, sp
|
|
\\ and sp, x0, #-16
|
|
\\ b %[posixCallMainAndExit]
|
|
,
|
|
.arm, .armeb, .thumb, .thumbeb =>
|
|
\\ mov fp, #0
|
|
\\ mov lr, #0
|
|
\\ mov a1, sp
|
|
\\ and sp, #-16
|
|
\\ b %[posixCallMainAndExit]
|
|
,
|
|
.loongarch32, .loongarch64 =>
|
|
\\ move $fp, $zero
|
|
\\ move $a0, $sp
|
|
\\ bstrins.d $sp, $zero, 3, 0
|
|
\\ b %[posixCallMainAndExit]
|
|
,
|
|
.riscv32, .riscv64 =>
|
|
\\ li s0, 0
|
|
\\ li ra, 0
|
|
\\ mv a0, sp
|
|
\\ andi sp, sp, -16
|
|
\\ tail %[posixCallMainAndExit]@plt
|
|
,
|
|
.m68k =>
|
|
// Note that the - 8 is needed because pc in the jsr instruction points into the middle
|
|
// of the jsr instruction. (The lea is 6 bytes, the jsr is 4 bytes.)
|
|
\\ suba.l %%fp, %%fp
|
|
\\ move.l %%sp, -(%%sp)
|
|
\\ lea %[posixCallMainAndExit] - . - 8, %%a0
|
|
\\ jsr (%%pc, %%a0)
|
|
,
|
|
.mips, .mipsel =>
|
|
\\ move $fp, $0
|
|
\\ bal 1f
|
|
\\ .gpword .
|
|
\\ .gpword %[posixCallMainAndExit]
|
|
\\ 1:
|
|
\\ lw $gp, 0($ra)
|
|
\\ subu $gp, $ra, $gp
|
|
\\ lw $25, 4($ra)
|
|
\\ addu $25, $25, $gp
|
|
\\ move $ra, $0
|
|
\\ move $a0, $sp
|
|
\\ and $sp, -8
|
|
\\ subu $sp, $sp, 16
|
|
\\ jalr $25
|
|
,
|
|
.mips64, .mips64el =>
|
|
\\ move $fp, $0
|
|
// This is needed because early MIPS versions don't support misaligned loads. Without
|
|
// this directive, the hidden `nop` inserted to fill the delay slot after `bal` would
|
|
// cause the two doublewords to be aligned to 4 bytes instead of 8.
|
|
\\ .balign 8
|
|
\\ bal 1f
|
|
\\ .gpdword .
|
|
\\ .gpdword %[posixCallMainAndExit]
|
|
\\ 1:
|
|
// The `gp` register on MIPS serves a similar purpose to `r2` (ToC pointer) on PPC64.
|
|
// We need to set it up in order for dynamically-linked / position-independent code to
|
|
// work.
|
|
\\ ld $gp, 0($ra)
|
|
\\ dsubu $gp, $ra, $gp
|
|
\\ ld $25, 8($ra)
|
|
\\ daddu $25, $25, $gp
|
|
\\ move $ra, $0
|
|
\\ move $a0, $sp
|
|
\\ and $sp, -16
|
|
\\ dsubu $sp, $sp, 16
|
|
\\ jalr $25
|
|
,
|
|
.powerpc, .powerpcle =>
|
|
// Set up the initial stack frame, and clear the back chain pointer.
|
|
\\ mr 3, 1
|
|
\\ clrrwi 1, 1, 4
|
|
\\ li 0, 0
|
|
\\ stwu 1, -16(1)
|
|
\\ stw 0, 0(1)
|
|
\\ mtlr 0
|
|
\\ b %[posixCallMainAndExit]
|
|
,
|
|
.powerpc64, .powerpc64le =>
|
|
// Set up the ToC and initial stack frame, and clear the back chain pointer.
|
|
\\ addis 2, 12, .TOC. - %[_start]@ha
|
|
\\ addi 2, 2, .TOC. - %[_start]@l
|
|
\\ mr 3, 1
|
|
\\ clrrdi 1, 1, 4
|
|
\\ li 0, 0
|
|
\\ stdu 0, -32(1)
|
|
\\ mtlr 0
|
|
\\ b %[posixCallMainAndExit]
|
|
,
|
|
.s390x =>
|
|
// Set up the stack frame (register save area and cleared back-chain slot).
|
|
\\ lgr %%r2, %%r15
|
|
\\ lghi %%r0, -16
|
|
\\ ngr %%r15, %%r0
|
|
\\ aghi %%r15, -160
|
|
\\ lghi %%r0, 0
|
|
\\ stg %%r0, 0(%%r15)
|
|
\\ jg %[posixCallMainAndExit]
|
|
,
|
|
.sparc64 =>
|
|
// argc is stored after a register window (16 registers * 8 bytes) plus the stack bias
|
|
// (2047 bytes).
|
|
\\ mov %%g0, %%fp
|
|
\\ add %%sp, 2175, %%o0
|
|
\\ add %%sp, 2047, %%sp
|
|
\\ and %%sp, -16, %%sp
|
|
\\ sub %%sp, 2047, %%sp
|
|
\\ ba,a %[posixCallMainAndExit]
|
|
,
|
|
else => @compileError("unsupported arch"),
|
|
}
|
|
:
|
|
: [_start] "X" (_start),
|
|
[posixCallMainAndExit] "X" (&posixCallMainAndExit),
|
|
);
|
|
}
|
|
|
|
fn WinStartup() callconv(std.os.windows.WINAPI) noreturn {
|
|
@setAlignStack(16);
|
|
if (!builtin.single_threaded and !builtin.link_libc) {
|
|
_ = @import("start_windows_tls.zig");
|
|
}
|
|
|
|
std.debug.maybeEnableSegfaultHandler();
|
|
|
|
std.os.windows.ntdll.RtlExitUserProcess(callMain());
|
|
}
|
|
|
|
fn wWinMainCRTStartup() callconv(std.os.windows.WINAPI) noreturn {
|
|
@setAlignStack(16);
|
|
if (!builtin.single_threaded and !builtin.link_libc) {
|
|
_ = @import("start_windows_tls.zig");
|
|
}
|
|
|
|
std.debug.maybeEnableSegfaultHandler();
|
|
|
|
const result: std.os.windows.INT = call_wWinMain();
|
|
std.os.windows.ntdll.RtlExitUserProcess(@as(std.os.windows.UINT, @bitCast(result)));
|
|
}
|
|
|
|
fn posixCallMainAndExit(argc_argv_ptr: [*]usize) callconv(.C) noreturn {
|
|
// We're not ready to panic until thread local storage is initialized.
|
|
@setRuntimeSafety(false);
|
|
// Code coverage instrumentation might try to use thread local variables.
|
|
@disableInstrumentation();
|
|
const argc = argc_argv_ptr[0];
|
|
const argv = @as([*][*:0]u8, @ptrCast(argc_argv_ptr + 1));
|
|
|
|
const envp_optional: [*:null]?[*:0]u8 = @ptrCast(@alignCast(argv + argc + 1));
|
|
var envp_count: usize = 0;
|
|
while (envp_optional[envp_count]) |_| : (envp_count += 1) {}
|
|
const envp = @as([*][*:0]u8, @ptrCast(envp_optional))[0..envp_count];
|
|
|
|
if (native_os == .linux) {
|
|
// Find the beginning of the auxiliary vector
|
|
const auxv: [*]elf.Auxv = @ptrCast(@alignCast(envp.ptr + envp_count + 1));
|
|
|
|
var at_hwcap: usize = 0;
|
|
const phdrs = init: {
|
|
var i: usize = 0;
|
|
var at_phdr: usize = 0;
|
|
var at_phnum: usize = 0;
|
|
while (auxv[i].a_type != elf.AT_NULL) : (i += 1) {
|
|
switch (auxv[i].a_type) {
|
|
elf.AT_PHNUM => at_phnum = auxv[i].a_un.a_val,
|
|
elf.AT_PHDR => at_phdr = auxv[i].a_un.a_val,
|
|
elf.AT_HWCAP => at_hwcap = auxv[i].a_un.a_val,
|
|
else => continue,
|
|
}
|
|
}
|
|
break :init @as([*]elf.Phdr, @ptrFromInt(at_phdr))[0..at_phnum];
|
|
};
|
|
|
|
// Apply the initial relocations as early as possible in the startup process. We cannot
|
|
// make calls yet on some architectures (e.g. MIPS) *because* they haven't been applied yet,
|
|
// so this must be fully inlined.
|
|
if (builtin.position_independent_executable) {
|
|
@call(.always_inline, std.os.linux.pie.relocate, .{phdrs});
|
|
}
|
|
|
|
// This must be done after PIE relocations have been applied or we may crash
|
|
// while trying to access the global variable (happens on MIPS at least).
|
|
std.os.linux.elf_aux_maybe = auxv;
|
|
|
|
if (!builtin.single_threaded) {
|
|
// ARMv6 targets (and earlier) have no support for TLS in hardware.
|
|
// FIXME: Elide the check for targets >= ARMv7 when the target feature API
|
|
// becomes less verbose (and more usable).
|
|
if (comptime native_arch.isARM()) {
|
|
if (at_hwcap & std.os.linux.HWCAP.TLS == 0) {
|
|
// FIXME: Make __aeabi_read_tp call the kernel helper kuser_get_tls
|
|
// For the time being use a simple trap instead of a @panic call to
|
|
// keep the binary bloat under control.
|
|
@trap();
|
|
}
|
|
}
|
|
|
|
// Initialize the TLS area.
|
|
std.os.linux.tls.initStaticTLS(phdrs);
|
|
}
|
|
|
|
// The way Linux executables represent stack size is via the PT_GNU_STACK
|
|
// program header. However the kernel does not recognize it; it always gives 8 MiB.
|
|
// Here we look for the stack size in our program headers and use setrlimit
|
|
// to ask for more stack space.
|
|
expandStackSize(phdrs);
|
|
}
|
|
|
|
std.posix.exit(callMainWithArgs(argc, argv, envp));
|
|
}
|
|
|
|
fn expandStackSize(phdrs: []elf.Phdr) void {
|
|
for (phdrs) |*phdr| {
|
|
switch (phdr.p_type) {
|
|
elf.PT_GNU_STACK => {
|
|
assert(phdr.p_memsz % std.mem.page_size == 0);
|
|
|
|
// Silently fail if we are unable to get limits.
|
|
const limits = std.posix.getrlimit(.STACK) catch break;
|
|
|
|
// Clamp to limits.max .
|
|
const wanted_stack_size = @min(phdr.p_memsz, limits.max);
|
|
|
|
if (wanted_stack_size > limits.cur) {
|
|
std.posix.setrlimit(.STACK, .{
|
|
.cur = wanted_stack_size,
|
|
.max = limits.max,
|
|
}) catch {
|
|
// Because we could not increase the stack size to the upper bound,
|
|
// depending on what happens at runtime, a stack overflow may occur.
|
|
// However it would cause a segmentation fault, thanks to stack probing,
|
|
// so we do not have a memory safety issue here.
|
|
// This is intentional silent failure.
|
|
// This logic should be revisited when the following issues are addressed:
|
|
// https://github.com/ziglang/zig/issues/157
|
|
// https://github.com/ziglang/zig/issues/1006
|
|
};
|
|
}
|
|
break;
|
|
},
|
|
else => {},
|
|
}
|
|
}
|
|
}
|
|
|
|
inline fn callMainWithArgs(argc: usize, argv: [*][*:0]u8, envp: [][*:0]u8) u8 {
|
|
std.os.argv = argv[0..argc];
|
|
std.os.environ = envp;
|
|
|
|
std.debug.maybeEnableSegfaultHandler();
|
|
maybeIgnoreSigpipe();
|
|
|
|
return callMain();
|
|
}
|
|
|
|
fn main(c_argc: c_int, c_argv: [*][*:0]c_char, c_envp: [*:null]?[*:0]c_char) callconv(.C) c_int {
|
|
var env_count: usize = 0;
|
|
while (c_envp[env_count] != null) : (env_count += 1) {}
|
|
const envp = @as([*][*:0]u8, @ptrCast(c_envp))[0..env_count];
|
|
|
|
if (builtin.os.tag == .linux) {
|
|
const at_phdr = std.c.getauxval(elf.AT_PHDR);
|
|
const at_phnum = std.c.getauxval(elf.AT_PHNUM);
|
|
const phdrs = (@as([*]elf.Phdr, @ptrFromInt(at_phdr)))[0..at_phnum];
|
|
expandStackSize(phdrs);
|
|
}
|
|
|
|
return callMainWithArgs(@as(usize, @intCast(c_argc)), @as([*][*:0]u8, @ptrCast(c_argv)), envp);
|
|
}
|
|
|
|
fn mainWithoutEnv(c_argc: c_int, c_argv: [*][*:0]c_char) callconv(.C) c_int {
|
|
std.os.argv = @as([*][*:0]u8, @ptrCast(c_argv))[0..@as(usize, @intCast(c_argc))];
|
|
return callMain();
|
|
}
|
|
|
|
// General error message for a malformed return type
|
|
const bad_main_ret = "expected return type of main to be 'void', '!void', 'noreturn', 'u8', or '!u8'";
|
|
|
|
pub inline fn callMain() u8 {
|
|
const ReturnType = @typeInfo(@TypeOf(root.main)).Fn.return_type.?;
|
|
|
|
switch (ReturnType) {
|
|
void => {
|
|
root.main();
|
|
return 0;
|
|
},
|
|
noreturn, u8 => {
|
|
return root.main();
|
|
},
|
|
else => {
|
|
if (@typeInfo(ReturnType) != .ErrorUnion) @compileError(bad_main_ret);
|
|
|
|
const result = root.main() catch |err| {
|
|
if (builtin.zig_backend == .stage2_riscv64) {
|
|
std.debug.print("error: failed with error\n", .{});
|
|
return 1;
|
|
}
|
|
std.log.err("{s}", .{@errorName(err)});
|
|
if (@errorReturnTrace()) |trace| {
|
|
std.debug.dumpStackTrace(trace.*);
|
|
}
|
|
return 1;
|
|
};
|
|
|
|
return switch (@TypeOf(result)) {
|
|
void => 0,
|
|
u8 => result,
|
|
else => @compileError(bad_main_ret),
|
|
};
|
|
},
|
|
}
|
|
}
|
|
|
|
pub fn call_wWinMain() std.os.windows.INT {
|
|
const peb = std.os.windows.peb();
|
|
const MAIN_HINSTANCE = @typeInfo(@TypeOf(root.wWinMain)).Fn.params[0].type.?;
|
|
const hInstance = @as(MAIN_HINSTANCE, @ptrCast(peb.ImageBaseAddress));
|
|
const lpCmdLine: [*:0]u16 = @ptrCast(peb.ProcessParameters.CommandLine.Buffer);
|
|
|
|
// There are various types used for the 'show window' variable through the Win32 APIs:
|
|
// - u16 in STARTUPINFOA.wShowWindow / STARTUPINFOW.wShowWindow
|
|
// - c_int in ShowWindow
|
|
// - u32 in PEB.ProcessParameters.dwShowWindow
|
|
// Since STARTUPINFO is the bottleneck for the allowed values, we use `u16` as the
|
|
// type which can coerce into i32/c_int/u32 depending on how the user defines their wWinMain
|
|
// (the Win32 docs show wWinMain with `int` as the type for nCmdShow).
|
|
const nCmdShow: u16 = nCmdShow: {
|
|
// This makes Zig match the nCmdShow behavior of a C program with a WinMain symbol:
|
|
// - With STARTF_USESHOWWINDOW set in STARTUPINFO.dwFlags of the CreateProcess call:
|
|
// - Compiled with subsystem:console -> nCmdShow is always SW_SHOWDEFAULT
|
|
// - Compiled with subsystem:windows -> nCmdShow is STARTUPINFO.wShowWindow from
|
|
// the parent CreateProcess call
|
|
// - With STARTF_USESHOWWINDOW unset:
|
|
// - nCmdShow is always SW_SHOWDEFAULT
|
|
const SW_SHOWDEFAULT = 10;
|
|
const STARTF_USESHOWWINDOW = 1;
|
|
// root having a wWinMain means that std.builtin.subsystem will always have a non-null value.
|
|
if (std.builtin.subsystem.? == .Windows and peb.ProcessParameters.dwFlags & STARTF_USESHOWWINDOW != 0) {
|
|
break :nCmdShow @truncate(peb.ProcessParameters.dwShowWindow);
|
|
}
|
|
break :nCmdShow SW_SHOWDEFAULT;
|
|
};
|
|
|
|
// second parameter hPrevInstance, MSDN: "This parameter is always NULL"
|
|
return root.wWinMain(hInstance, null, lpCmdLine, nCmdShow);
|
|
}
|
|
|
|
fn maybeIgnoreSigpipe() void {
|
|
const have_sigpipe_support = switch (builtin.os.tag) {
|
|
.linux,
|
|
.plan9,
|
|
.solaris,
|
|
.netbsd,
|
|
.openbsd,
|
|
.haiku,
|
|
.macos,
|
|
.ios,
|
|
.watchos,
|
|
.tvos,
|
|
.visionos,
|
|
.dragonfly,
|
|
.freebsd,
|
|
=> true,
|
|
|
|
else => false,
|
|
};
|
|
|
|
if (have_sigpipe_support and !std.options.keep_sigpipe) {
|
|
const posix = std.posix;
|
|
const act: posix.Sigaction = .{
|
|
// Set handler to a noop function instead of `SIG.IGN` to prevent
|
|
// leaking signal disposition to a child process.
|
|
.handler = .{ .handler = noopSigHandler },
|
|
.mask = posix.empty_sigset,
|
|
.flags = 0,
|
|
};
|
|
posix.sigaction(posix.SIG.PIPE, &act, null);
|
|
}
|
|
}
|
|
|
|
fn noopSigHandler(_: i32) callconv(.C) void {}
|