expand_test.go

     1  // Copyright 2025 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package scan_test
     6  
     7  import (
     8  	"internal/goarch"
     9  	"internal/runtime/gc"
    10  	"internal/runtime/gc/scan"
    11  	"testing"
    12  )
    13  
    14  type expandFunc func(sizeClass int, packed *gc.ObjMask, unpacked *gc.PtrMask)
    15  
    16  func testExpand(t *testing.T, expF expandFunc) {
    17  	expR := scan.ExpandReference
    18  
    19  	testObjs(t, func(t *testing.T, sizeClass int, objs *gc.ObjMask) {
    20  		var want, got gc.PtrMask
    21  		expR(sizeClass, objs, &want)
    22  		expF(sizeClass, objs, &got)
    23  
    24  		for i := range want {
    25  			if got[i] != want[i] {
    26  				t.Errorf("expansion differs from reference at bit %d", i*goarch.PtrSize)
    27  				if goarch.PtrSize == 4 {
    28  					t.Logf("got:  %032b", got[i])
    29  					t.Logf("want: %032b", want[i])
    30  				} else {
    31  					t.Logf("got:  %064b", got[i])
    32  					t.Logf("want: %064b", want[i])
    33  				}
    34  			}
    35  		}
    36  	})
    37  }
    38
View as plain text