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// 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.
package x86_test
import (
"bufio"
"bytes"
"fmt"
"internal/testenv"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"testing"
)
const testdata = `
MOVQ AX, AX -> MOVQ AX, AX
LEAQ name(SB), AX -> MOVQ name@GOT(SB), AX
LEAQ name+10(SB), AX -> MOVQ name@GOT(SB), AX; LEAQ 10(AX), AX
MOVQ $name(SB), AX -> MOVQ name@GOT(SB), AX
MOVQ $name+10(SB), AX -> MOVQ name@GOT(SB), AX; LEAQ 10(AX), AX
MOVQ name(SB), AX -> NOP; MOVQ name@GOT(SB), R15; MOVQ (R15), AX
MOVQ name+10(SB), AX -> NOP; MOVQ name@GOT(SB), R15; MOVQ 10(R15), AX
CMPQ name(SB), $0 -> NOP; MOVQ name@GOT(SB), R15; CMPQ (R15), $0
MOVQ $1, name(SB) -> NOP; MOVQ name@GOT(SB), R15; MOVQ $1, (R15)
MOVQ $1, name+10(SB) -> NOP; MOVQ name@GOT(SB), R15; MOVQ $1, 10(R15)
`
type ParsedTestData struct {
input string
marks []int
marker_to_input map[int][]string
marker_to_expected map[int][]string
marker_to_output map[int][]string
}
const marker_start = 1234
func parseTestData(t *testing.T) *ParsedTestData {
r := &ParsedTestData{}
scanner := bufio.NewScanner(strings.NewReader(testdata))
r.marker_to_input = make(map[int][]string)
r.marker_to_expected = make(map[int][]string)
marker := marker_start
input_insns := []string{}
for scanner.Scan() {
line := scanner.Text()
if len(strings.TrimSpace(line)) == 0 {
continue
}
parts := strings.Split(line, "->")
if len(parts) != 2 {
t.Fatalf("malformed line %v", line)
}
r.marks = append(r.marks, marker)
marker_insn := fmt.Sprintf("MOVQ $%d, AX", marker)
input_insns = append(input_insns, marker_insn)
for _, input_insn := range strings.Split(parts[0], ";") {
input_insns = append(input_insns, input_insn)
r.marker_to_input[marker] = append(r.marker_to_input[marker], normalize(input_insn))
}
for _, expected_insn := range strings.Split(parts[1], ";") {
r.marker_to_expected[marker] = append(r.marker_to_expected[marker], normalize(expected_insn))
}
marker++
}
r.input = "TEXT ·foo(SB),$0\n" + strings.Join(input_insns, "\n") + "\n"
return r
}
var spaces_re *regexp.Regexp = regexp.MustCompile(`\s+`)
func normalize(s string) string {
return spaces_re.ReplaceAllLiteralString(strings.TrimSpace(s), " ")
}
func asmOutput(t *testing.T, s string) []byte {
tmpdir, err := os.MkdirTemp("", "progedittest")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpdir)
tmpfile, err := os.Create(filepath.Join(tmpdir, "input.s"))
if err != nil {
t.Fatal(err)
}
defer tmpfile.Close()
_, err = tmpfile.WriteString(s)
if err != nil {
t.Fatal(err)
}
cmd := testenv.Command(t,
testenv.GoToolPath(t), "tool", "asm", "-S", "-dynlink",
"-o", filepath.Join(tmpdir, "output.6"), tmpfile.Name())
cmd.Env = append(os.Environ(),
"GOARCH=amd64", "GOOS=linux", "GOPATH="+filepath.Join(tmpdir, "_gopath"))
asmout, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("error %s output %s", err, asmout)
}
return asmout
}
func parseOutput(t *testing.T, td *ParsedTestData, asmout []byte) {
scanner := bufio.NewScanner(bytes.NewReader(asmout))
marker := regexp.MustCompile(`MOVQ \$([0-9]+), AX`)
mark := -1
td.marker_to_output = make(map[int][]string)
for scanner.Scan() {
line := scanner.Text()
if line[0] != '\t' {
continue
}
parts := strings.SplitN(line, "\t", 3)
if len(parts) != 3 {
continue
}
n := normalize(parts[2])
mark_matches := marker.FindStringSubmatch(n)
if mark_matches != nil {
mark, _ = strconv.Atoi(mark_matches[1])
if _, ok := td.marker_to_input[mark]; !ok {
t.Fatalf("unexpected marker %d", mark)
}
} else if mark != -1 {
td.marker_to_output[mark] = append(td.marker_to_output[mark], n)
}
}
}
func TestDynlink(t *testing.T) {
testenv.MustHaveGoBuild(t)
if os.Getenv("GOHOSTARCH") != "" {
// TODO: make this work? It was failing due to the
// GOARCH= filtering above and skipping is easiest for
// now.
t.Skip("skipping when GOHOSTARCH is set")
}
testdata := parseTestData(t)
asmout := asmOutput(t, testdata.input)
parseOutput(t, testdata, asmout)
for _, m := range testdata.marks {
i := strings.Join(testdata.marker_to_input[m], "; ")
o := strings.Join(testdata.marker_to_output[m], "; ")
e := strings.Join(testdata.marker_to_expected[m], "; ")
if o != e {
if o == i {
t.Errorf("%s was unchanged; should have become %s", i, e)
} else {
t.Errorf("%s became %s; should have become %s", i, o, e)
}
} else if i != e {
t.Logf("%s correctly became %s", i, o)
}
}
}