fix issue in invalid error stacks for glog; improve internal/debug and gutil for stack printing

.example/other/test.go

@@ -1,7 +1,10 @@
 package main
 
-func main() {
-	for i := 0; i < 10; i++ {
+import (
+	"github.com/gogf/gf/os/glog"
+)
 
-	}
+func main() {
+	glog.Error("error")
+	glog.Errorfln("error")
 }

internal/debug/debug.go

@@ -39,7 +39,7 @@ func PrintStack(skip ...int) {
 // Stack returns a formatted stack trace of the goroutine that calls it.
 // It calls runtime.Stack with a large enough buffer to capture the entire trace.
 func Stack(skip ...int) string {
-	return StackWithFilter("", skip...)
+	return StackWithFilter(gFILTER_KEY, skip...)
 }
 
 // StackWithFilter returns a formatted stack trace of the goroutine that calls it.

os/glog/glog_logger.go

@@ -349,9 +349,5 @@ func (l *Logger) PrintStack(skip ...int) {
 // GetStack returns the caller stack content,
 // the optional parameter <skip> specify the skipped stack offset from the end point.
 func (l *Logger) GetStack(skip ...int) string {
-	number := 1
-	if len(skip) > 0 {
-		number = skip[0] + 1
-	}
-	return debug.StackWithFilter(gPATH_FILTER_KEY, number)
+	return debug.StackWithFilter(gPATH_FILTER_KEY, skip...)
 }

util/gutil/gutil_debug.go

@@ -7,24 +7,22 @@
 package gutil
 
 import (
+	"fmt"
+
 	"github.com/gogf/gf/internal/debug"
 )
 
+const (
+	gFILTER_KEY = "/gf/util/gutil/gutil_debug.go"
+)
+
 // PrintStack prints to standard error the stack trace returned by runtime.Stack.
 func PrintStack(skip ...int) {
-	number := 1
-	if len(skip) > 0 {
-		number = skip[0] + 1
-	}
-	debug.PrintStack(number)
+	fmt.Print(Stack(skip...))
 }
 
 // Stack returns a formatted stack trace of the goroutine that calls it.
 // It calls runtime.Stack with a large enough buffer to capture the entire trace.
 func Stack(skip ...int) string {
-	number := 1
-	if len(skip) > 0 {
-		number = skip[0] + 1
-	}
-	return debug.Stack(number)
+	return debug.StackWithFilter(gFILTER_KEY, skip...)
 }