/
asm_test.go
593 lines (569 loc) · 11.8 KB
/
asm_test.go
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// Copyright 2016 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 gc
import (
"bytes"
"fmt"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strings"
"testing"
)
// TestAssembly checks to make sure the assembly generated for
// functions contains certain expected instructions.
func TestAssembly(t *testing.T) {
if testing.Short() {
t.Skip("slow test; skipping")
}
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "windows" {
// TODO: remove if we can get "go tool compile -S" to work on windows.
t.Skipf("skipping test: recursive windows compile not working")
}
dir, err := ioutil.TempDir("", "TestAssembly")
if err != nil {
t.Fatalf("could not create directory: %v", err)
}
defer os.RemoveAll(dir)
for _, test := range asmTests {
asm := compileToAsm(t, dir, test.arch, test.os, fmt.Sprintf(template, test.function))
// Get rid of code for "".init. Also gets rid of type algorithms & other junk.
if i := strings.Index(asm, "\n\"\".init "); i >= 0 {
asm = asm[:i+1]
}
for _, r := range test.regexps {
if b, err := regexp.MatchString(r, asm); !b || err != nil {
t.Errorf("%s/%s: expected:%s\ngo:%s\nasm:%s\n", test.os, test.arch, r, test.function, asm)
}
}
}
}
// compile compiles the package pkg for architecture arch and
// returns the generated assembly. dir is a scratch directory.
func compileToAsm(t *testing.T, dir, goarch, goos, pkg string) string {
// Create source.
src := filepath.Join(dir, "test.go")
f, err := os.Create(src)
if err != nil {
panic(err)
}
f.Write([]byte(pkg))
f.Close()
// First, install any dependencies we need. This builds the required export data
// for any packages that are imported.
// TODO: extract dependencies automatically?
var stdout, stderr bytes.Buffer
cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", filepath.Join(dir, "encoding/binary.a"), "encoding/binary")
cmd.Env = mergeEnvLists([]string{"GOARCH=" + goarch, "GOOS=" + goos}, os.Environ())
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
panic(err)
}
if s := stdout.String(); s != "" {
panic(fmt.Errorf("Stdout = %s\nWant empty", s))
}
if s := stderr.String(); s != "" {
panic(fmt.Errorf("Stderr = %s\nWant empty", s))
}
// Now, compile the individual file for which we want to see the generated assembly.
cmd = exec.Command(testenv.GoToolPath(t), "tool", "compile", "-I", dir, "-S", "-o", filepath.Join(dir, "out.o"), src)
cmd.Env = mergeEnvLists([]string{"GOARCH=" + goarch, "GOOS=" + goos}, os.Environ())
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
panic(err)
}
if s := stderr.String(); s != "" {
panic(fmt.Errorf("Stderr = %s\nWant empty", s))
}
return stdout.String()
}
// template to convert a function to a full file
const template = `
package main
%s
`
type asmTest struct {
// architecture to compile to
arch string
// os to compile to
os string
// function to compile
function string
// regexps that must match the generated assembly
regexps []string
}
var asmTests = [...]asmTest{
{"amd64", "linux", `
func f(x int) int {
return x * 64
}
`,
[]string{"\tSHLQ\t\\$6,"},
},
{"amd64", "linux", `
func f(x int) int {
return x * 96
}`,
[]string{"\tSHLQ\t\\$5,", "\tLEAQ\t\\(.*\\)\\(.*\\*2\\),"},
},
// Load-combining tests.
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte) uint64 {
return binary.LittleEndian.Uint64(b)
}
`,
[]string{"\tMOVQ\t\\(.*\\),"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint64 {
return binary.LittleEndian.Uint64(b[i:])
}
`,
[]string{"\tMOVQ\t\\(.*\\)\\(.*\\*1\\),"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte) uint32 {
return binary.LittleEndian.Uint32(b)
}
`,
[]string{"\tMOVL\t\\(.*\\),"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint32 {
return binary.LittleEndian.Uint32(b[i:])
}
`,
[]string{"\tMOVL\t\\(.*\\)\\(.*\\*1\\),"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte) uint64 {
return binary.BigEndian.Uint64(b)
}
`,
[]string{"\tBSWAPQ\t"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint64 {
return binary.BigEndian.Uint64(b[i:])
}
`,
[]string{"\tBSWAPQ\t"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte, v uint64) {
binary.BigEndian.PutUint64(b, v)
}
`,
[]string{"\tBSWAPQ\t"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte) uint32 {
return binary.BigEndian.Uint32(b)
}
`,
[]string{"\tBSWAPL\t"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint32 {
return binary.BigEndian.Uint32(b[i:])
}
`,
[]string{"\tBSWAPL\t"},
},
{"amd64", "linux", `
import "encoding/binary"
func f(b []byte, v uint32) {
binary.BigEndian.PutUint32(b, v)
}
`,
[]string{"\tBSWAPL\t"},
},
{"386", "linux", `
import "encoding/binary"
func f(b []byte) uint32 {
return binary.LittleEndian.Uint32(b)
}
`,
[]string{"\tMOVL\t\\(.*\\),"},
},
{"386", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint32 {
return binary.LittleEndian.Uint32(b[i:])
}
`,
[]string{"\tMOVL\t\\(.*\\)\\(.*\\*1\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte) uint32 {
return binary.LittleEndian.Uint32(b)
}
`,
[]string{"\tMOVWBR\t\\(.*\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint32 {
return binary.LittleEndian.Uint32(b[i:])
}
`,
[]string{"\tMOVWBR\t\\(.*\\)\\(.*\\*1\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte) uint64 {
return binary.LittleEndian.Uint64(b)
}
`,
[]string{"\tMOVDBR\t\\(.*\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint64 {
return binary.LittleEndian.Uint64(b[i:])
}
`,
[]string{"\tMOVDBR\t\\(.*\\)\\(.*\\*1\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte) uint32 {
return binary.BigEndian.Uint32(b)
}
`,
[]string{"\tMOVWZ\t\\(.*\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint32 {
return binary.BigEndian.Uint32(b[i:])
}
`,
[]string{"\tMOVWZ\t\\(.*\\)\\(.*\\*1\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte) uint64 {
return binary.BigEndian.Uint64(b)
}
`,
[]string{"\tMOVD\t\\(.*\\),"},
},
{"s390x", "linux", `
import "encoding/binary"
func f(b []byte, i int) uint64 {
return binary.BigEndian.Uint64(b[i:])
}
`,
[]string{"\tMOVD\t\\(.*\\)\\(.*\\*1\\),"},
},
// Structure zeroing. See issue #18370.
{"amd64", "linux", `
type T struct {
a, b, c int
}
func f(t *T) {
*t = T{}
}
`,
[]string{"\tMOVQ\t\\$0, \\(.*\\)", "\tMOVQ\t\\$0, 8\\(.*\\)", "\tMOVQ\t\\$0, 16\\(.*\\)"},
},
// TODO: add a test for *t = T{3,4,5} when we fix that.
// Rotate tests
{"amd64", "linux", `
func f(x uint64) uint64 {
return x<<7 | x>>57
}
`,
[]string{"\tROLQ\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint64) uint64 {
return x<<7 + x>>57
}
`,
[]string{"\tROLQ\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint64) uint64 {
return x<<7 ^ x>>57
}
`,
[]string{"\tROLQ\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint32) uint32 {
return x<<7 + x>>25
}
`,
[]string{"\tROLL\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint32) uint32 {
return x<<7 | x>>25
}
`,
[]string{"\tROLL\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint32) uint32 {
return x<<7 ^ x>>25
}
`,
[]string{"\tROLL\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint16) uint16 {
return x<<7 + x>>9
}
`,
[]string{"\tROLW\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint16) uint16 {
return x<<7 | x>>9
}
`,
[]string{"\tROLW\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint16) uint16 {
return x<<7 ^ x>>9
}
`,
[]string{"\tROLW\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint8) uint8 {
return x<<7 + x>>1
}
`,
[]string{"\tROLB\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint8) uint8 {
return x<<7 | x>>1
}
`,
[]string{"\tROLB\t[$]7,"},
},
{"amd64", "linux", `
func f(x uint8) uint8 {
return x<<7 ^ x>>1
}
`,
[]string{"\tROLB\t[$]7,"},
},
{"arm", "linux", `
func f(x uint32) uint32 {
return x<<7 + x>>25
}
`,
[]string{"\tMOVW\tR[0-9]+@>25,"},
},
{"arm", "linux", `
func f(x uint32) uint32 {
return x<<7 | x>>25
}
`,
[]string{"\tMOVW\tR[0-9]+@>25,"},
},
{"arm", "linux", `
func f(x uint32) uint32 {
return x<<7 ^ x>>25
}
`,
[]string{"\tMOVW\tR[0-9]+@>25,"},
},
{"arm64", "linux", `
func f(x uint64) uint64 {
return x<<7 + x>>57
}
`,
[]string{"\tROR\t[$]57,"},
},
{"arm64", "linux", `
func f(x uint64) uint64 {
return x<<7 | x>>57
}
`,
[]string{"\tROR\t[$]57,"},
},
{"arm64", "linux", `
func f(x uint64) uint64 {
return x<<7 ^ x>>57
}
`,
[]string{"\tROR\t[$]57,"},
},
{"arm64", "linux", `
func f(x uint32) uint32 {
return x<<7 + x>>25
}
`,
[]string{"\tRORW\t[$]25,"},
},
{"arm64", "linux", `
func f(x uint32) uint32 {
return x<<7 | x>>25
}
`,
[]string{"\tRORW\t[$]25,"},
},
{"arm64", "linux", `
func f(x uint32) uint32 {
return x<<7 ^ x>>25
}
`,
[]string{"\tRORW\t[$]25,"},
},
{"s390x", "linux", `
func f(x uint64) uint64 {
return x<<7 + x>>57
}
`,
[]string{"\tRLLG\t[$]7,"},
},
{"s390x", "linux", `
func f(x uint64) uint64 {
return x<<7 | x>>57
}
`,
[]string{"\tRLLG\t[$]7,"},
},
{"s390x", "linux", `
func f(x uint64) uint64 {
return x<<7 ^ x>>57
}
`,
[]string{"\tRLLG\t[$]7,"},
},
{"s390x", "linux", `
func f(x uint32) uint32 {
return x<<7 + x>>25
}
`,
[]string{"\tRLL\t[$]7,"},
},
{"s390x", "linux", `
func f(x uint32) uint32 {
return x<<7 | x>>25
}
`,
[]string{"\tRLL\t[$]7,"},
},
{"s390x", "linux", `
func f(x uint32) uint32 {
return x<<7 ^ x>>25
}
`,
[]string{"\tRLL\t[$]7,"},
},
// Rotate after inlining (see issue 18254).
{"amd64", "linux", `
func f(x uint32, k uint) uint32 {
return x<<k | x>>(32-k)
}
func g(x uint32) uint32 {
return f(x, 7)
}
`,
[]string{"\tROLL\t[$]7,"},
},
// Direct use of constants in fast map access calls. Issue 19015.
{"amd64", "linux", `
func f(m map[int]int) int {
return m[5]
}
`,
[]string{"\tMOVQ\t[$]5,"},
},
{"amd64", "linux", `
func f(m map[int]int) bool {
_, ok := m[5]
return ok
}
`,
[]string{"\tMOVQ\t[$]5,"},
},
{"amd64", "linux", `
func f(m map[string]int) int {
return m["abc"]
}
`,
[]string{"\"abc\""},
},
{"amd64", "linux", `
func f(m map[string]int) bool {
_, ok := m["abc"]
return ok
}
`,
[]string{"\"abc\""},
},
}
// mergeEnvLists merges the two environment lists such that
// variables with the same name in "in" replace those in "out".
// This always returns a newly allocated slice.
func mergeEnvLists(in, out []string) []string {
out = append([]string(nil), out...)
NextVar:
for _, inkv := range in {
k := strings.SplitAfterN(inkv, "=", 2)[0]
for i, outkv := range out {
if strings.HasPrefix(outkv, k) {
out[i] = inkv
continue NextVar
}
}
out = append(out, inkv)
}
return out
}
// TestLineNumber checks to make sure the generated assembly has line numbers
// see issue #16214
func TestLineNumber(t *testing.T) {
testenv.MustHaveGoBuild(t)
dir, err := ioutil.TempDir("", "TestLineNumber")
if err != nil {
t.Fatalf("could not create directory: %v", err)
}
defer os.RemoveAll(dir)
src := filepath.Join(dir, "x.go")
err = ioutil.WriteFile(src, []byte(issue16214src), 0644)
if err != nil {
t.Fatalf("could not write file: %v", err)
}
cmd := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-S", "-o", filepath.Join(dir, "out.o"), src)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("fail to run go tool compile: %v", err)
}
if strings.Contains(string(out), "unknown line number") {
t.Errorf("line number missing in assembly:\n%s", out)
}
}
var issue16214src = `
package main
func Mod32(x uint32) uint32 {
return x % 3 // frontend rewrites it as HMUL with 2863311531, the LITERAL node has unknown Pos
}
`