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Source file test/escape_level.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 indirection level computation in escape analysis.
  
  package escape
  
  var sink interface{}
  
  func level0() {
  	i := 0     // ERROR "moved to heap: i"
  	p0 := &i   // ERROR "moved to heap: p0" "&i escapes to heap"
  	p1 := &p0  // ERROR "moved to heap: p1" "&p0 escapes to heap"
  	p2 := &p1  // ERROR "moved to heap: p2" "&p1 escapes to heap"
  	sink = &p2 // ERROR "&p2 escapes to heap"
  }
  
  func level1() {
  	i := 0    // ERROR "moved to heap: i"
  	p0 := &i  // ERROR "moved to heap: p0" "&i escapes to heap"
  	p1 := &p0 // ERROR "moved to heap: p1" "&p0 escapes to heap"
  	p2 := &p1 // ERROR "&p1 escapes to heap"
  	sink = p2 // ERROR "p2 escapes to heap"
  }
  
  func level2() {
  	i := 0     // ERROR "moved to heap: i"
  	p0 := &i   // ERROR "moved to heap: p0" "&i escapes to heap"
  	p1 := &p0  // ERROR "&p0 escapes to heap"
  	p2 := &p1  // ERROR "&p1 does not escape"
  	sink = *p2 // ERROR "\*p2 escapes to heap"
  }
  
  func level3() {
  	i := 0      // ERROR "moved to heap: i"
  	p0 := &i    // ERROR "&i escapes to heap"
  	p1 := &p0   // ERROR "&p0 does not escape"
  	p2 := &p1   // ERROR "&p1 does not escape"
  	sink = **p2 // ERROR "\* \(\*p2\) escapes to heap"
  }
  
  func level4() {
  	i := 0     // ERROR "moved to heap: i"
  	p0 := &i   // ERROR "moved to heap: p0" "&i escapes to heap"
  	p1 := &p0  // ERROR "&p0 escapes to heap"
  	p2 := p1   // ERROR "moved to heap: p2"
  	sink = &p2 // ERROR "&p2 escapes to heap"
  }
  
  func level5() {
  	i := 0    // ERROR "moved to heap: i"
  	p0 := &i  // ERROR "moved to heap: p0" "&i escapes to heap"
  	p1 := &p0 // ERROR "&p0 escapes to heap"
  	p2 := p1
  	sink = p2 // ERROR "p2 escapes to heap"
  }
  
  func level6() {
  	i := 0    // ERROR "moved to heap: i"
  	p0 := &i  // ERROR "&i escapes to heap"
  	p1 := &p0 // ERROR "&p0 does not escape"
  	p2 := p1
  	sink = *p2 // ERROR "\*p2 escapes to heap"
  }
  
  func level7() {
  	i := 0    // ERROR "moved to heap: i"
  	p0 := &i  // ERROR "&i escapes to heap"
  	p1 := &p0 // ERROR "&p0 does not escape"
  	// note *p1 == &i
  	p2 := *p1  // ERROR "moved to heap: p2"
  	sink = &p2 // ERROR "&p2 escapes to heap"
  }
  
  func level8() {
  	i := 0    // ERROR "moved to heap: i"
  	p0 := &i  // ERROR "&i escapes to heap"
  	p1 := &p0 // ERROR "&p0 does not escape"
  	p2 := *p1
  	sink = p2 // ERROR "p2 escapes to heap"
  }
  
  func level9() {
  	i := 0
  	p0 := &i  // ERROR "&i does not escape"
  	p1 := &p0 // ERROR "&p0 does not escape"
  	p2 := *p1
  	sink = *p2 // ERROR "\*p2 escapes to heap"
  }
  
  func level10() {
  	i := 0
  	p0 := &i // ERROR "&i does not escape"
  	p1 := *p0
  	p2 := &p1  // ERROR "&p1 does not escape"
  	sink = *p2 // ERROR "\*p2 escapes to heap"
  }
  
  func level11() {
  	i := 0
  	p0 := &i   // ERROR "&i does not escape"
  	p1 := &p0  // ERROR "&p0 does not escape"
  	p2 := **p1 // ERROR "moved to heap: p2"
  	sink = &p2 // ERROR "&p2 escapes to heap"
  }
  

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