...
Run Format

Source file test/inline_callers.go

Documentation: test

  // run -gcflags -l=4
  
  // Copyright 2017 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package main
  
  import (
  	"log"
  	"runtime"
  )
  
  var skip int
  var npcs int
  var pcs = make([]uintptr, 32)
  
  func f() {
  	g()
  }
  
  func g() {
  	h()
  }
  
  func h() {
  	npcs = runtime.Callers(skip, pcs)
  }
  
  func testCallers(skp int) (frames []string) {
  	skip = skp
  	f()
  	for i := 0; i < npcs; i++ {
  		fn := runtime.FuncForPC(pcs[i])
  		frames = append(frames, fn.Name())
  		if fn.Name() == "main.main" {
  			break
  		}
  	}
  	return
  }
  
  func testCallersFrames(skp int) (frames []string) {
  	skip = skp
  	f()
  	callers := pcs[:npcs]
  	ci := runtime.CallersFrames(callers)
  	for {
  		frame, more := ci.Next()
  		frames = append(frames, frame.Function)
  		if !more || frame.Function == "main.main" {
  			break
  		}
  	}
  	return
  }
  
  var expectedFrames [][]string = [][]string{
  	0: {"runtime.Callers", "main.testCallers", "main.main"},
  	1: {"main.testCallers", "main.main"},
  	2: {"main.testCallers", "runtime.skipPleaseUseCallersFrames", "main.main"},
  	3: {"main.testCallers", "runtime.skipPleaseUseCallersFrames", "main.main"},
  	4: {"main.testCallers", "runtime.skipPleaseUseCallersFrames", "main.main"},
  	5: {"main.main"},
  }
  
  var allFrames = []string{"runtime.Callers", "main.h", "main.g", "main.f", "main.testCallersFrames", "main.main"}
  
  func same(xs, ys []string) bool {
  	if len(xs) != len(ys) {
  		return false
  	}
  	for i := range xs {
  		if xs[i] != ys[i] {
  			return false
  		}
  	}
  	return true
  }
  
  func main() {
  	for i := 0; i <= 5; i++ {
  		frames := testCallers(i)
  		expected := expectedFrames[i]
  		if !same(frames, expected) {
  			log.Fatalf("testCallers(%d):\n got %v\n want %v", i, frames, expected)
  		}
  
  		frames = testCallersFrames(i)
  		expected = allFrames[i:]
  		if !same(frames, expected) {
  			log.Fatalf("testCallersFrames(%d):\n got %v\n want %v", i, frames, expected)
  		}
  	}
  }
  

View as plain text