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Source file test/fixedbugs/issue10353.go

Documentation: test/fixedbugs

  // run
  
  // Copyright 2015 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.
  
  // issue 10253: cmd/gc: incorrect escape analysis of closures
  // Partial call x.foo was not promoted to heap.
  
  package main
  
  func main() {
  	c := make(chan bool)
  	// Create a new goroutine to get a default-size stack segment.
  	go func() {
  		x := new(X)
  		clos(x.foo)()
  		c <- true
  	}()
  	<-c
  }
  
  type X int
  
  func (x *X) foo() {
  }
  
  func clos(x func()) func() {
  	f := func() {
  		print("")
  		x() // This statement crashed, because the partial call was allocated on the old stack.
  	}
  	// Grow stack so that partial call x becomes invalid if allocated on stack.
  	growstack(10000)
  	c := make(chan bool)
  	// Spoil the previous stack segment.
  	go func() {
  		c <- true
  	}()
  	<-c
  	return f
  }
  
  func growstack(x int) {
  	if x == 0 {
  		return
  	}
  	growstack(x - 1)
  }
  

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