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Source file test/escape4.go

Documentation: test

  // errorcheck -0 -m
  
  // Copyright 2010 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, using compiler diagnostic flags, that the escape analysis is working.
  // Compiles but does not run.  Inlining is enabled.
  
  package foo
  
  var p *int
  
  func alloc(x int) *int { // ERROR "can inline alloc" "moved to heap: x"
  	return &x // ERROR "&x escapes to heap"
  }
  
  var f func()
  
  func f1() {
  	p = alloc(2) // ERROR "inlining call to alloc" "&x escapes to heap" "moved to heap: x"
  
  	// Escape analysis used to miss inlined code in closures.
  
  	func() { // ERROR "func literal does not escape" "can inline f1.func1"
  		p = alloc(3) // ERROR "inlining call to alloc" "&x escapes to heap" "moved to heap: x"
  	}()
  
  	f = func() { // ERROR "func literal escapes to heap" "can inline f1.func2"
  		p = alloc(3) // ERROR "inlining call to alloc" "&x escapes to heap" "moved to heap: x"
  	}
  	f()
  }
  
  func f2() {} // ERROR "can inline f2"
  
  // No inline for panic, recover.
  func f3() { panic(1) }
  func f4() { recover() }
  
  func f5() *byte {
  	type T struct {
  		x [1]byte
  	}
  	t := new(T)    // ERROR "new.T. escapes to heap"
  	return &t.x[0] // ERROR "&t.x.0. escapes to heap"
  }
  
  func f6() *byte {
  	type T struct {
  		x struct {
  			y byte
  		}
  	}
  	t := new(T)   // ERROR "new.T. escapes to heap"
  	return &t.x.y // ERROR "&t.x.y escapes to heap"
  }
  

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