143d6ada8f
Note that only the index variable requires a stack allocation, and the
memcpy for the element is gone.
```zig
export fn entry() void {
var buf: [10]i32 = undefined;
for (buf) |x| {}
}
```
```llvm
define void @entry() #2 !dbg !35 {
Entry:
%buf = alloca [10 x i32], align 4
%i = alloca i64, align 8
%0 = bitcast [10 x i32]* %buf to i8*, !dbg !47
call void @llvm.memset.p0i8.i64(i8* align 4 %0, i8 -86, i64 40, i1 false), !dbg !47
call void @llvm.dbg.declare(metadata [10 x i32]* %buf, metadata !39, metadata !DIExpression()), !dbg !47
store i64 0, i64* %i, align 8, !dbg !48
call void @llvm.dbg.declare(metadata i64* %i, metadata !45, metadata !DIExpression()), !dbg !48
br label %ForCond, !dbg !48
ForCond: ; preds = %ForBody, %Entry
%1 = load i64, i64* %i, align 8, !dbg !48
%2 = icmp ult i64 %1, 10, !dbg !48
br i1 %2, label %ForBody, label %ForEnd, !dbg !48
ForBody: ; preds = %ForCond
%3 = getelementptr inbounds [10 x i32], [10 x i32]* %buf, i64 0, i64 %1, !dbg !48
call void @llvm.dbg.declare(metadata i32* %3, metadata !46, metadata !DIExpression()), !dbg !49
%4 = add nuw i64 %1, 1, !dbg !48
store i64 %4, i64* %i, align 8, !dbg !48
br label %ForCond, !dbg !48
ForEnd: ; preds = %ForCond
ret void, !dbg !50
}
```
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brew outdated llvm@8 || brew upgrade llvm@8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