Go's defer and panic: Open-Coded Defers and the Runtime's Unwind Loop
Go compiles a defer three different ways depending on where it appears, and the panic runtime unwinds those three shapes separately.
Runtime
Go's Generics: Dictionary Passing, Shape Stenciling and GC Shape
Generic code is shared per shape, the concrete types arrive in a flat dictionary of machine words, and the shape’s layout is what makes the sharing safe.
Go's Interfaces Are Two Words and a Cached itab
Interfaces are two machine words, the itab is usually emitted statically by the compiler, and the runtime keeps a lock-protected hash table for the cases it cannot know.
GODEBUG: The Knobs Go Gives You to Turn Up the Volume
GODEBUG is two mechanisms wearing one name: a table of compatibility settings whose defaults change with each release, and a set of runtime debug knobs, both read from one …
How cgo Works in Go: The Two Compilers and a Bit of Magic
cgo runs the C compiler to learn C types, rewrites your Go source into Cfunc wrappers, generates matching C glue that passes arguments in a struct, and each call goes through a …