forked from go-delve/delve
/
fncall.go
90 lines (74 loc) · 1.81 KB
/
fncall.go
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package main
import (
"fmt"
"runtime"
"strings"
)
func callstacktrace() (stacktrace string) {
for skip := 0; ; skip++ {
pc, file, line, ok := runtime.Caller(skip)
if !ok {
break
}
fn := runtime.FuncForPC(pc)
stacktrace += fmt.Sprintf("in %s at %s:%d\n", fn.Name(), file, line)
}
return stacktrace
}
func call1(a, b int) int {
fmt.Printf("first: %d second: %d\n", a, b)
return a + b
}
func callpanic() {
fmt.Printf("about to panic\n")
panic("callpanic panicked")
}
func stringsJoin(v []string, sep string) string {
// This is needed because strings.Join is in an optimized package and
// because of a bug in the compiler arguments of optimized functions don't
// have a location.
return strings.Join(v, sep)
}
type astruct struct {
X int
}
func (a astruct) VRcvr(x int) string {
return fmt.Sprintf("%d + %d = %d", x, a.X, x+a.X)
}
func (pa *astruct) PRcvr(x int) string {
return fmt.Sprintf("%d - %d = %d", x, pa.X, x-pa.X)
}
type PRcvrable interface {
PRcvr(int) string
}
type VRcvrable interface {
VRcvr(int) string
}
var zero = 0
func makeclos(pa *astruct) func(int) string {
i := 0
return func(x int) string {
i++
return fmt.Sprintf("%d + %d + %d = %d", i, pa.X, x, i+pa.X+x)
}
}
func main() {
one, two := 1, 2
intslice := []int{1, 2, 3}
stringslice := []string{"one", "two", "three"}
comma := ","
a := astruct{X: 3}
pa := &astruct{X: 6}
var vable_a VRcvrable = a
var vable_pa VRcvrable = pa
var pable_pa PRcvrable = pa
fn2clos := makeclos(pa)
fn2glob := call1
fn2valmeth := pa.VRcvr
fn2ptrmeth := pa.PRcvr
var fn2nil func()
runtime.Breakpoint()
call1(one, two)
fn2clos(2)
fmt.Println(one, two, zero, callpanic, callstacktrace, stringsJoin, intslice, stringslice, comma, a.VRcvr, a.PRcvr, pa, vable_a, vable_pa, pable_pa, fn2clos, fn2glob, fn2valmeth, fn2ptrmeth, fn2nil)
}