9a324ecb42
```zig
export fn entry() void {
var x = foo();
var ptr = &x.b;
var y = ptr.*;
}
const Foo = packed struct {
a: u24 = 1,
b: Bar = Bar{},
};
const Bar = packed struct {
a: u4 = 2,
b: u4 = 3,
};
```
```llvm
define void @entry() #2 !dbg !35 {
Entry:
%x = alloca %Foo, align 1
%ptr = alloca i32*, align 8
%y = alloca %Bar, align 1
call fastcc void @foo(%Foo* sret %x), !dbg !55
call void @llvm.dbg.declare(metadata %Foo* %x, metadata !39, metadata !DIExpression()), !dbg !56
%0 = getelementptr inbounds %Foo, %Foo* %x, i32 0, i32 0, !dbg !57
store i32* %0, i32** %ptr, align 8, !dbg !57
call void @llvm.dbg.declare(metadata i32** %ptr, metadata !51, metadata !DIExpression()), !dbg !58
%1 = load i32*, i32** %ptr, align 8, !dbg !59
%2 = load i32, i32* %1, align 1, !dbg !60
%3 = lshr i32 %2, 24, !dbg !60
%4 = trunc i32 %3 to i8, !dbg !60
%5 = bitcast %Bar* %y to i8*, !dbg !60
store i8 %4, i8* %5, !dbg !60
call void @llvm.dbg.declare(metadata %Bar* %y, metadata !54, metadata !DIExpression()), !dbg !61
ret void, !dbg !62
}
```
Zig is an open-source programming language designed for robustness, optimality, and maintainability.
Resources
Building from Source
Note that you can download a binary of master branch.
Stage 1: Build Zig from C++ Source Code
Dependencies
POSIX
- cmake >= 2.8.5
- gcc >= 5.0.0 or clang >= 3.6.0
- LLVM, Clang, LLD development libraries == 8.x, compiled with the same gcc or clang version above
- Use the system package manager, or build from source.
Windows
- cmake >= 2.8.5
- Microsoft Visual Studio 2017 (version 15.8)
- LLVM, Clang, LLD development libraries == 8.x, compiled with the same MSVC version above
- Use the pre-built binaries or build from source.
Instructions
POSIX
mkdir build
cd build
cmake ..
make install
MacOS
brew install cmake llvm@8
brew outdated llvm@8 || brew upgrade llvm@8
mkdir build
cd build
cmake .. -DCMAKE_PREFIX_PATH=/usr/local/Cellar/llvm/8.0.0
make install
Windows
See https://github.com/ziglang/zig/wiki/Building-Zig-on-Windows
Stage 2: Build Self-Hosted Zig from Zig Source Code
Note: Stage 2 compiler is not complete. Beta users of Zig should use the Stage 1 compiler for now.
Dependencies are the same as Stage 1, except now you can use stage 1 to compile Zig code.
bin/zig build --build-file ../build.zig --prefix $(pwd)/stage2 install
This produces ./stage2/bin/zig which can be used for testing and development.
Once it is feature complete, it will be used to build stage 3 - the final compiler
binary.
Stage 3: Rebuild Self-Hosted Zig Using the Self-Hosted Compiler
Note: Stage 2 compiler is not yet able to build Stage 3. Building Stage 3 is not yet supported.
Once the self-hosted compiler can build itself, this will be the actual compiler binary that we will install to the system. Until then, users should use stage 1.
Debug / Development Build
./stage2/bin/zig build --build-file ../build.zig --prefix $(pwd)/stage3 install
Release / Install Build
./stage2/bin/zig build --build-file ../build.zig install -Drelease-fast