tobyxdd/ginline

Go AST inliner

ginline

Go AST inliner

Example

Source

package main

import "fmt"

// [always_inline]
func calcs(a, b int) (int, int, int) {
	return a + b, a - b, a * b
}

func main() {
	a, b, c := calcs(7, 9)
	fmt.Println(a, b, c)
}

Generated

package main

import "fmt"

func main() {
	var (
		a int
		b int
		c int
	)
	{
		var (
			_rv_0 int
			_rv_1 int
			_rv_2 int
		)
		{
			var (
				a int = 7
				b int = 9
			)
			{
				_rv_0 = a + b
				_rv_1 = a - b
				_rv_2 = a * b
			}
		}
		a, b, c = _rv_0, _rv_1, _rv_2
	}
	fmt.Println(a, b, c)
}

Limitations

• Only supports calls without using return values (foo()) and simple assignments (a, b, c := foo()). The cases where it appears in expressions (bar(foo()+1)) are not supported for now (WIP)
• Methods (func (b Bar) Foo()) are not supported for now (WIP)
• Can't handle defer correctly (Unsure about the solution. Suggestions are welcome)