go/src/cmd/compile/internal/walk/closure.go

// directClosureCall rewrites a direct call of a function literal into
// a normal function call with closure variables passed as arguments.
// This avoids allocation of a closure object.
//
// For illustration, the following call:
//
//	func(a int) {
//		println(byval)
//		byref++
//	}(42)
//
// becomes:
//
//	func(byval int, &byref *int, a int) {
//		println(byval)
//		(*&byref)++
//	}(byval, &byref, 42)
func directClosureCall(n *ir.CallExpr) { … }

func walkClosure(clo *ir.ClosureExpr, init *ir.Nodes) ir.Node { … }

// closureArgs returns a slice of expressions that can be used to
// initialize the given closure's free variables. These correspond
// one-to-one with the variables in clo.Func.ClosureVars, and will be
// either an ONAME node (if the variable is captured by value) or an
// OADDR-of-ONAME node (if not).
func closureArgs(clo *ir.ClosureExpr) []ir.Node { … }

func walkMethodValue(n *ir.SelectorExpr, init *ir.Nodes) ir.Node { … }

// methodValueWrapper returns the ONAME node representing the
// wrapper function (*-fm) needed for the given method value. If the
// wrapper function hasn't already been created yet, it's created and
// added to typecheck.Target.Decls.
func methodValueWrapper(dot *ir.SelectorExpr) *ir.Name { … }