Systems

Internal building blocks of the compiler and toolchain. Each page below covers an architectural component with code in src/, lib/std/, or lib/compiler/.

Page	What it covers
Compiler	The pipeline driver in src/: Compilation, Zcu, Sema, Air, InternPool, main.zig.
Frontend	Tokenization, parsing, AST, and AstGen → ZIR. Lives in lib/std/zig/.
Code generation backends	LLVM and the self-hosted x86_64/AArch64/RISC-V/Wasm/SPIR-V/C backends.
Linkers	The in-tree ELF, MachO, COFF, Wasm, SPIR-V, and C linkers.
Standard library	lib/std/ — the Zig stdlib.
Build system	std.Build and zig build.
Package manager	build.zig.zon, src/Package.zig, fetch & cache.
Compiler runtime	lib/compiler_rt/ — soft-float, division, atomics.
Bundled libraries	libc/libcxx/libunwind/libtsan/clang resource headers.

See Architecture for the high-level picture before drilling in.