zig/src-self-hosted/translate_c.zig

// This is the userland implementation of translate-c which will be used by both stage1
// and stage2. Currently it's not used by anything, as it's not feature complete.

const std = @import("std");

export fn stage2_translate_c() void {
    std.debug.panic("unimplemented");
}
stage1 is now a hybrid of C++ and Zig This modifies the build process of Zig to put all of the source files into libcompiler.a, except main.cpp and userland.cpp. Next, the build process links main.cpp, userland.cpp, and libcompiler.a into zig1. userland.cpp is a shim for functions that will later be replaced with self-hosted implementations. Next, the build process uses zig1 to build src-self-hosted/stage1.zig into libuserland.a, which does not depend on any of the things that are shimmed in userland.cpp, such as translate-c. Finally, the build process re-links main.cpp and libcompiler.a, except with libuserland.a instead of userland.cpp. Now the shims are replaced with .zig code. This provides all of the Zig standard library to the stage1 C++ compiler, and enables us to move certain things to userland, such as translate-c. As a proof of concept I have made the `zig zen` command use text defined in userland. I added `zig translate-c-2` which is a work-in-progress reimplementation of translate-c in userland, which currently calls `std.debug.panic("unimplemented")` and you can see the stack trace makes it all the way back into the C++ main() function (Thanks LemonBoy for improving that!). This could potentially let us move other things into userland, such as hashing algorithms, the entire cache system, .d file parsing, pretty much anything that libuserland.a itself doesn't need to depend on. This can also let us have `zig fmt` in stage1 without the overhead of child process execution, and without the initial compilation delay before it gets cached. See #1964 2019-04-17 04:47:47 +08:00			`// This is the userland implementation of translate-c which will be used by both stage1`
			`// and stage2. Currently it's not used by anything, as it's not feature complete.`

			`const std = @import("std");`

			`export fn stage2_translate_c() void {`
			`std.debug.panic("unimplemented");`
			`}`