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Source file test/escape_closure.go

Documentation: test

  // errorcheck -0 -m -l
  
  // 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.
  
  // Test escape analysis for closure arguments.
  
  package escape
  
  var sink interface{}
  
  func ClosureCallArgs0() {
  	x := 0         // ERROR "moved to heap: x"
  	func(p *int) { // ERROR "p does not escape" "func literal does not escape"
  		*p = 1
  		// BAD: x should not escape to heap here
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs1() {
  	x := 0 // ERROR "moved to heap: x"
  	for {
  		func(p *int) { // ERROR "p does not escape" "func literal does not escape"
  			*p = 1
  			// BAD: x should not escape to heap here
  		}(&x) // ERROR "&x escapes to heap"
  	}
  }
  
  func ClosureCallArgs2() {
  	for {
  		// BAD: x should not escape here
  		x := 0         // ERROR "moved to heap: x"
  		func(p *int) { // ERROR "p does not escape" "func literal does not escape"
  			*p = 1
  		}(&x) // ERROR "&x escapes to heap"
  	}
  }
  
  func ClosureCallArgs3() {
  	x := 0         // ERROR "moved to heap: x"
  	func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
  		sink = p // ERROR "p escapes to heap"
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs4() {
  	// BAD: x should not leak here
  	x := 0                  // ERROR "moved to heap: x"
  	_ = func(p *int) *int { // ERROR "leaking param: p to result ~r1" "func literal does not escape"
  		return p
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs5() {
  	x := 0                     // ERROR "moved to heap: x"
  	sink = func(p *int) *int { // ERROR "leaking param: p to result ~r1" "func literal does not escape" "\(func literal\)\(&x\) escapes to heap"
  		return p
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs6() {
  	x := 0         // ERROR "moved to heap: x"
  	func(p *int) { // ERROR "moved to heap: p" "func literal does not escape"
  		sink = &p // ERROR "&p escapes to heap"
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs7() {
  	var pp *int
  	for {
  		x := 0         // ERROR "moved to heap: x"
  		func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
  			pp = p
  		}(&x) // ERROR "&x escapes to heap"
  	}
  	_ = pp
  }
  
  func ClosureCallArgs8() {
  	x := 0               // ERROR "moved to heap: x"
  	defer func(p *int) { // ERROR "p does not escape" "func literal does not escape"
  		*p = 1
  		// BAD: x should not escape to heap here
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs9() {
  	// BAD: x should not leak
  	x := 0 // ERROR "moved to heap: x"
  	for {
  		defer func(p *int) { // ERROR "func literal escapes to heap" "p does not escape"
  			*p = 1
  		}(&x) // ERROR "&x escapes to heap"
  	}
  }
  
  func ClosureCallArgs10() {
  	for {
  		x := 0               // ERROR "moved to heap: x"
  		defer func(p *int) { // ERROR "func literal escapes to heap" "p does not escape"
  			*p = 1
  		}(&x) // ERROR "&x escapes to heap"
  	}
  }
  
  func ClosureCallArgs11() {
  	x := 0               // ERROR "moved to heap: x"
  	defer func(p *int) { // ERROR "leaking param: p" "func literal does not escape"
  		sink = p // ERROR "p escapes to heap"
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs12() {
  	// BAD: x should not leak
  	x := 0                    // ERROR "moved to heap: x"
  	defer func(p *int) *int { // ERROR "leaking param: p to result ~r1" "func literal does not escape"
  		return p
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs13() {
  	x := 0               // ERROR "moved to heap: x"
  	defer func(p *int) { // ERROR "moved to heap: p" "func literal does not escape"
  		sink = &p // ERROR "&p escapes to heap"
  	}(&x) // ERROR "&x escapes to heap"
  }
  
  func ClosureCallArgs14() {
  	x := 0 // ERROR "moved to heap: x"
  	// BAD: &x should not escape here
  	p := &x                  // ERROR "moved to heap: p" "&x escapes to heap"
  	_ = func(p **int) *int { // ERROR "leaking param: p to result ~r1 level=1" "func literal does not escape"
  		return *p
  		// BAD: p should not escape here
  	}(&p) // ERROR "&p escapes to heap"
  }
  
  func ClosureCallArgs15() {
  	x := 0                      // ERROR "moved to heap: x"
  	p := &x                     // ERROR "moved to heap: p" "&x escapes to heap"
  	sink = func(p **int) *int { // ERROR "leaking param: p to result ~r1 level=1" "func literal does not escape" "\(func literal\)\(&p\) escapes to heap"
  		return *p
  		// BAD: p should not escape here
  	}(&p) // ERROR "&p escapes to heap"
  }
  
  func ClosureLeak1(s string) string { // ERROR "ClosureLeak1 s does not escape"
  	t := s + "YYYY"         // ERROR "escapes to heap"
  	return ClosureLeak1a(t) // ERROR "ClosureLeak1 ... argument does not escape"
  }
  
  // See #14409 -- returning part of captured var leaks it.
  func ClosureLeak1a(a ...string) string { // ERROR "leaking param: a to result ~r1 level=1"
  	return func() string { // ERROR "ClosureLeak1a func literal does not escape"
  		return a[0]
  	}()
  }
  
  func ClosureLeak2(s string) string { // ERROR "ClosureLeak2 s does not escape"
  	t := s + "YYYY"       // ERROR "escapes to heap"
  	c := ClosureLeak2a(t) // ERROR "ClosureLeak2 ... argument does not escape"
  	return c
  }
  func ClosureLeak2a(a ...string) string { // ERROR "leaking param: a to result ~r1 level=1"
  	return ClosureLeak2b(func() string { // ERROR "ClosureLeak2a func literal does not escape"
  		return a[0]
  	})
  }
  func ClosureLeak2b(f func() string) string { // ERROR "leaking param: f to result ~r1 level=1"
  	return f()
  }
  

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