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move more startup code to std lib

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This commit is contained in:
Vexu
2019-11-30 15:39:11 +02:00
committed by Andrew Kelley
parent fd7c7be33c
commit a0ca30ce01
6 changed files with 79 additions and 114 deletions
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16
lib/std/builtin.zig
View File

@@ -348,6 +348,22 @@ pub const Endian = enum {
Little,
};
/// This data structure is used by the Zig language code generation and
/// therefore must be kept in sync with the compiler implementation.
pub const OutType = enum {
Unknown,
Exe,
Lib,
Obj,
};
/// This data structure is used by the Zig language code generation and
/// therefore must be kept in sync with the compiler implementation.
pub const LinkType = enum {
Static,
Dynamic,
};
/// This data structure is used by the Zig language code generation and
/// therefore must be kept in sync with the compiler implementation.
pub const Version = struct {

55
lib/std/special/start.zig
View File

@@ -19,21 +19,52 @@ const is_mips = switch (builtin.arch) {
};
comptime {
if (builtin.link_libc) {
@export("main", main, .Strong);
} else if (builtin.os == .windows) {
@export("WinMainCRTStartup", WinMainCRTStartup, .Strong);
} else if (is_wasm and builtin.os == .freestanding) {
@export("_start", wasm_freestanding_start, .Strong);
} else if (builtin.os == .uefi) {
@export("EfiMain", EfiMain, .Strong);
} else if (is_mips) {
if (!@hasDecl(root, "__start")) @export("__start", _start, .Strong);
} else {
if (!@hasDecl(root, "_start")) @export("_start", _start, .Strong);
switch (builtin.output_type) {
.Unknown => unreachable,
.Exe => {
if (builtin.link_libc) {
if (!@hasDecl(root, "main") or
@typeInfo(@typeOf(root.main)).Fn.calling_convention != .C)
{
@export("main", main, .Weak);
}
} else if (builtin.os == .windows) {
if (!@hasDecl(root, "WinMain") and !@hasDecl(root, "WinMainCRTStartup")) {
@export("WinMainCRTStartup", WinMainCRTStartup, .Strong);
}
} else if (is_wasm and builtin.os == .freestanding) {
if (!@hasDecl(root, "_start")) @export("_start", wasm_freestanding_start, .Strong);
} else if (builtin.os == .uefi) {
if (!@hasDecl(root, "EfiMain")) @export("EfiMain", EfiMain, .Strong);
} else if (is_mips) {
if (!@hasDecl(root, "__start")) @export("__start", _start, .Strong);
} else {
if (!@hasDecl(root, "_start")) @export("_start", _start, .Strong);
}
},
.Lib => {
if (builtin.os == .windows and builtin.link_type == .Dynamic and
!@hasDecl(root, "_DllMainCRTStartup"))
{
@export("_DllMainCRTStartup", _DllMainCRTStartup, .Strong);
}
},
.Obj => {},
}
}
stdcallcc fn _DllMainCRTStartup(
hinstDLL: std.os.windows.HINSTANCE,
fdwReason: std.os.windows.DWORD,
lpReserved: std.os.windows.LPVOID,
) std.os.windows.BOOL {
if (@hasDecl(root, "DllMain")) {
return root.DllMain(hinstDLL, fdwReason, lpReserved);
}
return std.os.windows.TRUE;
}
extern fn wasm_freestanding_start() 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.

21
lib/std/special/start_lib.zig
View File

@@ -1,21 +0,0 @@
// This file is included in the compilation unit when exporting a DLL on windows.
const root = @import("root");
const std = @import("std");
const builtin = @import("builtin");
comptime {
@export("_DllMainCRTStartup", _DllMainCRTStartup, builtin.GlobalLinkage.Strong);
}
stdcallcc fn _DllMainCRTStartup(
hinstDLL: std.os.windows.HINSTANCE,
fdwReason: std.os.windows.DWORD,
lpReserved: std.os.windows.LPVOID,
) std.os.windows.BOOL {
if (@hasDecl(root, "DllMain")) {
return root.DllMain(hinstDLL, fdwReason, lpReserved);
}
return std.os.windows.TRUE;
}