| cmd/internal/bio | Package bio implements common I/O abstractions used within the Go toolchain. |
| cmd/internal/browser | Package browser provides utilities for interacting with users' browsers. |
| cmd/internal/dwarf | Package dwarf generates DWARF debugging information. |
| cmd/internal/gcprog | Package gcprog implements an encoder for packed GC pointer bitmaps, known as GC programs. |
| cmd/internal/goobj | Package goobj implements reading of Go object files and archives. |
| cmd/internal/obj | |
| cmd/internal/objabi | Originally, Go object files were Plan 9 object files, but no longer. |
| cmd/internal/obj/arm | |
| cmd/internal/obj/arm64 | |
| cmd/internal/objfile | Package objfile implements portable access to OS-specific executable files. |
| cmd/internal/obj/mips | |
| cmd/internal/obj/ppc64 | |
| cmd/internal/obj/s390x | |
| cmd/internal/obj/x86 | |
| cmd/internal/src | |
| cmd/internal/sys | |