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// Copyright 2014 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 for auto-generated symbols.
// There is no test for $f64. and $f32. symbols, because those are
// not possible to write in the assembler syntax. Instead of changing
// the assembler to allow that, we plan to change the compilers
// not to generate such symbols (plain dupok data is sufficient).
package main
import (
"bytes"
"cmd/internal/goobj"
"testing"
)
// Each test case is an object file, generated from a corresponding .s file.
// The image of the autotab symbol should be a sequence of pairs of
// identical 8-byte sequences.
var autoTests = []string{
"testdata/autosection.6",
"testdata/autoweak.6",
}
func TestAuto(t *testing.T) {
for _, obj := range autoTests {
p := Prog{GOOS: "darwin", GOARCH: "amd64", StartSym: "start"}
p.omitRuntime = true
p.Error = func(s string) { t.Error(s) }
var buf bytes.Buffer
p.link(&buf, obj)
if p.NumError > 0 {
continue // already reported
}
const name = "autotab"
sym := p.Syms[goobj.SymID{Name: name}]
if sym == nil {
t.Errorf("%s is missing %s symbol", obj, name)
return
}
if sym.Size == 0 {
return
}
seg := sym.Section.Segment
off := sym.Addr - seg.VirtAddr
data := seg.Data[off : off+Addr(sym.Size)]
if len(data)%16 != 0 {
t.Errorf("%s: %s.Size = %d, want multiple of 16", obj, name, len(data))
return
}
Data:
for i := 0; i < len(data); i += 16 {
have := p.byteorder.Uint64(data[i : i+8])
want := p.byteorder.Uint64(data[i+8 : i+16])
if have != want {
// Look for relocation so we can explain what went wrong.
for _, r := range sym.Reloc {
if r.Offset == i {
t.Errorf("%s: %s+%#x: %s: have %#x want %#x", obj, name, i, r.Sym, have, want)
continue Data
}
}
t.Errorf("%s: %s+%#x: have %#x want %#x", obj, name, i, have, want)
}
}
}
}
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