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// Copyright 2020 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.
package obj
import (
"cmd/internal/goobj"
"cmd/internal/sys"
"testing"
)
var dummyArch = LinkArch{Arch: sys.ArchAMD64}
func TestContentHash64(t *testing.T) {
s1 := &LSym{P: []byte("A")}
s2 := &LSym{P: []byte("A\x00\x00\x00")}
s1.Set(AttrContentAddressable, true)
s2.Set(AttrContentAddressable, true)
h1 := contentHash64(s1)
h2 := contentHash64(s2)
if h1 != h2 {
t.Errorf("contentHash64(s1)=%x, contentHash64(s2)=%x, expect equal", h1, h2)
}
ctxt := Linknew(&dummyArch) // little endian
s3 := ctxt.Int64Sym(int64('A'))
h3 := contentHash64(s3)
if h1 != h3 {
t.Errorf("contentHash64(s1)=%x, contentHash64(s3)=%x, expect equal", h1, h3)
}
}
func TestContentHash(t *testing.T) {
syms := []*LSym{
&LSym{P: []byte("TestSymbol")}, // 0
&LSym{P: []byte("TestSymbol")}, // 1
&LSym{P: []byte("TestSymbol2")}, // 2
&LSym{P: []byte("")}, // 3
&LSym{P: []byte("")}, // 4
&LSym{P: []byte("")}, // 5
&LSym{P: []byte("")}, // 6
}
for _, s := range syms {
s.Set(AttrContentAddressable, true)
s.PkgIdx = goobj.PkgIdxHashed
}
// s3 references s0
r := Addrel(syms[3])
r.Sym = syms[0]
// s4 references s0
r = Addrel(syms[4])
r.Sym = syms[0]
// s5 references s1
r = Addrel(syms[5])
r.Sym = syms[1]
// s6 references s2
r = Addrel(syms[6])
r.Sym = syms[2]
// compute hashes
h := make([]goobj.HashType, len(syms))
w := &writer{}
for i := range h {
h[i] = w.contentHash(syms[i])
}
tests := []struct {
a, b int
equal bool
}{
{0, 1, true}, // same contents, no relocs
{0, 2, false}, // different contents
{3, 4, true}, // same contents, same relocs
{3, 5, true}, // recursively same contents
{3, 6, false}, // same contents, different relocs
}
for _, test := range tests {
if (h[test.a] == h[test.b]) != test.equal {
eq := "equal"
if !test.equal {
eq = "not equal"
}
t.Errorf("h%d=%x, h%d=%x, expect %s", test.a, h[test.a], test.b, h[test.b], eq)
}
}
}
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