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Diffstat (limited to 'src/cmd/vendor/golang.org/x/arch/arm/armasm/ext_test.go')
-rw-r--r--src/cmd/vendor/golang.org/x/arch/arm/armasm/ext_test.go615
1 files changed, 0 insertions, 615 deletions
diff --git a/src/cmd/vendor/golang.org/x/arch/arm/armasm/ext_test.go b/src/cmd/vendor/golang.org/x/arch/arm/armasm/ext_test.go
deleted file mode 100644
index f0758625f9..0000000000
--- a/src/cmd/vendor/golang.org/x/arch/arm/armasm/ext_test.go
+++ /dev/null
@@ -1,615 +0,0 @@
-// 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.
-
-// Support for testing against external disassembler program.
-// Copied and simplified from ../../x86/x86asm/ext_test.go.
-
-package armasm
-
-import (
- "bufio"
- "bytes"
- "encoding/hex"
- "flag"
- "fmt"
- "io"
- "io/ioutil"
- "log"
- "math/rand"
- "os"
- "os/exec"
- "regexp"
- "runtime"
- "strings"
- "testing"
- "time"
-)
-
-var (
- printTests = flag.Bool("printtests", false, "print test cases that exercise new code paths")
- dumpTest = flag.Bool("dump", false, "dump all encodings")
- mismatch = flag.Bool("mismatch", false, "log allowed mismatches")
- longTest = flag.Bool("long", false, "long test")
- keep = flag.Bool("keep", false, "keep object files around")
- debug = false
-)
-
-// An ExtInst represents a single decoded instruction parsed
-// from an external disassembler's output.
-type ExtInst struct {
- addr uint32
- enc [4]byte
- nenc int
- text string
-}
-
-func (r ExtInst) String() string {
- return fmt.Sprintf("%#x: % x: %s", r.addr, r.enc, r.text)
-}
-
-// An ExtDis is a connection between an external disassembler and a test.
-type ExtDis struct {
- Arch Mode
- Dec chan ExtInst
- File *os.File
- Size int
- KeepFile bool
- Cmd *exec.Cmd
-}
-
-// Run runs the given command - the external disassembler - and returns
-// a buffered reader of its standard output.
-func (ext *ExtDis) Run(cmd ...string) (*bufio.Reader, error) {
- if *keep {
- log.Printf("%s\n", strings.Join(cmd, " "))
- }
- ext.Cmd = exec.Command(cmd[0], cmd[1:]...)
- out, err := ext.Cmd.StdoutPipe()
- if err != nil {
- return nil, fmt.Errorf("stdoutpipe: %v", err)
- }
- if err := ext.Cmd.Start(); err != nil {
- return nil, fmt.Errorf("exec: %v", err)
- }
-
- b := bufio.NewReaderSize(out, 1<<20)
- return b, nil
-}
-
-// Wait waits for the command started with Run to exit.
-func (ext *ExtDis) Wait() error {
- return ext.Cmd.Wait()
-}
-
-// testExtDis tests a set of byte sequences against an external disassembler.
-// The disassembler is expected to produce the given syntax and be run
-// in the given architecture mode (16, 32, or 64-bit).
-// The extdis function must start the external disassembler
-// and then parse its output, sending the parsed instructions on ext.Dec.
-// The generate function calls its argument f once for each byte sequence
-// to be tested. The generate function itself will be called twice, and it must
-// make the same sequence of calls to f each time.
-// When a disassembly does not match the internal decoding,
-// allowedMismatch determines whether this mismatch should be
-// allowed, or else considered an error.
-func testExtDis(
- t *testing.T,
- syntax string,
- arch Mode,
- extdis func(ext *ExtDis) error,
- generate func(f func([]byte)),
- allowedMismatch func(text string, size int, inst *Inst, dec ExtInst) bool,
-) {
- start := time.Now()
- ext := &ExtDis{
- Dec: make(chan ExtInst),
- Arch: arch,
- }
- errc := make(chan error)
-
- // First pass: write instructions to input file for external disassembler.
- file, f, size, err := writeInst(generate)
- if err != nil {
- t.Fatal(err)
- }
- ext.Size = size
- ext.File = f
- defer func() {
- f.Close()
- if !*keep {
- os.Remove(file)
- }
- }()
-
- // Second pass: compare disassembly against our decodings.
- var (
- totalTests = 0
- totalSkips = 0
- totalErrors = 0
-
- errors = make([]string, 0, 100) // sampled errors, at most cap
- )
- go func() {
- errc <- extdis(ext)
- }()
- generate(func(enc []byte) {
- dec, ok := <-ext.Dec
- if !ok {
- t.Errorf("decoding stream ended early")
- return
- }
- inst, text := disasm(syntax, arch, pad(enc))
- totalTests++
- if *dumpTest {
- fmt.Printf("%x -> %s [%d]\n", enc[:len(enc)], dec.text, dec.nenc)
- }
- if text != dec.text || inst.Len != dec.nenc {
- suffix := ""
- if allowedMismatch(text, size, &inst, dec) {
- totalSkips++
- if !*mismatch {
- return
- }
- suffix += " (allowed mismatch)"
- }
- totalErrors++
- if len(errors) >= cap(errors) {
- j := rand.Intn(totalErrors)
- if j >= cap(errors) {
- return
- }
- errors = append(errors[:j], errors[j+1:]...)
- }
- errors = append(errors, fmt.Sprintf("decode(%x) = %q, %d, want %q, %d%s", enc, text, inst.Len, dec.text, dec.nenc, suffix))
- }
- })
-
- if *mismatch {
- totalErrors -= totalSkips
- }
-
- for _, b := range errors {
- t.Log(b)
- }
-
- if totalErrors > 0 {
- t.Fail()
- }
- t.Logf("%d test cases, %d expected mismatches, %d failures; %.0f cases/second", totalTests, totalSkips, totalErrors, float64(totalTests)/time.Since(start).Seconds())
-
- if err := <-errc; err != nil {
- t.Fatalf("external disassembler: %v", err)
- }
-
-}
-
-const start = 0x8000 // start address of text
-
-// writeInst writes the generated byte sequences to a new file
-// starting at offset start. That file is intended to be the input to
-// the external disassembler.
-func writeInst(generate func(func([]byte))) (file string, f *os.File, size int, err error) {
- f, err = ioutil.TempFile("", "armasm")
- if err != nil {
- return
- }
-
- file = f.Name()
-
- f.Seek(start, io.SeekStart)
- w := bufio.NewWriter(f)
- defer w.Flush()
- size = 0
- generate(func(x []byte) {
- if len(x) > 4 {
- x = x[:4]
- }
- if debug {
- fmt.Printf("%#x: %x%x\n", start+size, x, zeros[len(x):])
- }
- w.Write(x)
- w.Write(zeros[len(x):])
- size += len(zeros)
- })
- return file, f, size, nil
-}
-
-var zeros = []byte{0, 0, 0, 0}
-
-// pad pads the code sequence with pops.
-func pad(enc []byte) []byte {
- if len(enc) < 4 {
- enc = append(enc[:len(enc):len(enc)], zeros[:4-len(enc)]...)
- }
- return enc
-}
-
-// disasm returns the decoded instruction and text
-// for the given source bytes, using the given syntax and mode.
-func disasm(syntax string, mode Mode, src []byte) (inst Inst, text string) {
- // If printTests is set, we record the coverage value
- // before and after, and we write out the inputs for which
- // coverage went up, in the format expected in testdata/decode.text.
- // This produces a fairly small set of test cases that exercise nearly
- // all the code.
- var cover float64
- if *printTests {
- cover -= coverage()
- }
-
- inst, err := Decode(src, mode)
- if err != nil {
- text = "error: " + err.Error()
- } else {
- text = inst.String()
- switch syntax {
- //case "arm":
- // text = ARMSyntax(inst)
- case "gnu":
- text = GNUSyntax(inst)
- //case "plan9": // [sic]
- // text = GoSyntax(inst, 0, nil)
- default:
- text = "error: unknown syntax " + syntax
- }
- }
-
- if *printTests {
- cover += coverage()
- if cover > 0 {
- max := len(src)
- if max > 4 && inst.Len <= 4 {
- max = 4
- }
- fmt.Printf("%x|%x\t%d\t%s\t%s\n", src[:inst.Len], src[inst.Len:max], mode, syntax, text)
- }
- }
-
- return
-}
-
-// coverage returns a floating point number denoting the
-// test coverage until now. The number increases when new code paths are exercised,
-// both in the Go program and in the decoder byte code.
-func coverage() float64 {
- /*
- testing.Coverage is not in the main distribution.
- The implementation, which must go in package testing, is:
-
- // Coverage reports the current code coverage as a fraction in the range [0, 1].
- func Coverage() float64 {
- var n, d int64
- for _, counters := range cover.Counters {
- for _, c := range counters {
- if c > 0 {
- n++
- }
- d++
- }
- }
- if d == 0 {
- return 0
- }
- return float64(n) / float64(d)
- }
- */
-
- var f float64
- f += testing.Coverage()
- f += decodeCoverage()
- return f
-}
-
-func decodeCoverage() float64 {
- n := 0
- for _, t := range decoderCover {
- if t {
- n++
- }
- }
- return float64(1+n) / float64(1+len(decoderCover))
-}
-
-// Helpers for writing disassembler output parsers.
-
-// hasPrefix reports whether any of the space-separated words in the text s
-// begins with any of the given prefixes.
-func hasPrefix(s string, prefixes ...string) bool {
- for _, prefix := range prefixes {
- for s := s; s != ""; {
- if strings.HasPrefix(s, prefix) {
- return true
- }
- i := strings.Index(s, " ")
- if i < 0 {
- break
- }
- s = s[i+1:]
- }
- }
- return false
-}
-
-// contains reports whether the text s contains any of the given substrings.
-func contains(s string, substrings ...string) bool {
- for _, sub := range substrings {
- if strings.Contains(s, sub) {
- return true
- }
- }
- return false
-}
-
-// isHex reports whether b is a hexadecimal character (0-9A-Fa-f).
-func isHex(b byte) bool { return b == '0' || unhex[b] > 0 }
-
-// parseHex parses the hexadecimal byte dump in hex,
-// appending the parsed bytes to raw and returning the updated slice.
-// The returned bool signals whether any invalid hex was found.
-// Spaces and tabs between bytes are okay but any other non-hex is not.
-func parseHex(hex []byte, raw []byte) ([]byte, bool) {
- hex = trimSpace(hex)
- for j := 0; j < len(hex); {
- for hex[j] == ' ' || hex[j] == '\t' {
- j++
- }
- if j >= len(hex) {
- break
- }
- if j+2 > len(hex) || !isHex(hex[j]) || !isHex(hex[j+1]) {
- return nil, false
- }
- raw = append(raw, unhex[hex[j]]<<4|unhex[hex[j+1]])
- j += 2
- }
- return raw, true
-}
-
-var unhex = [256]byte{
- '0': 0,
- '1': 1,
- '2': 2,
- '3': 3,
- '4': 4,
- '5': 5,
- '6': 6,
- '7': 7,
- '8': 8,
- '9': 9,
- 'A': 10,
- 'B': 11,
- 'C': 12,
- 'D': 13,
- 'E': 14,
- 'F': 15,
- 'a': 10,
- 'b': 11,
- 'c': 12,
- 'd': 13,
- 'e': 14,
- 'f': 15,
-}
-
-// index is like bytes.Index(s, []byte(t)) but avoids the allocation.
-func index(s []byte, t string) int {
- i := 0
- for {
- j := bytes.IndexByte(s[i:], t[0])
- if j < 0 {
- return -1
- }
- i = i + j
- if i+len(t) > len(s) {
- return -1
- }
- for k := 1; k < len(t); k++ {
- if s[i+k] != t[k] {
- goto nomatch
- }
- }
- return i
- nomatch:
- i++
- }
-}
-
-// fixSpace rewrites runs of spaces, tabs, and newline characters into single spaces in s.
-// If s must be rewritten, it is rewritten in place.
-func fixSpace(s []byte) []byte {
- s = trimSpace(s)
- for i := 0; i < len(s); i++ {
- if s[i] == '\t' || s[i] == '\n' || i > 0 && s[i] == ' ' && s[i-1] == ' ' {
- goto Fix
- }
- }
- return s
-
-Fix:
- b := s
- w := 0
- for i := 0; i < len(s); i++ {
- c := s[i]
- if c == '\t' || c == '\n' {
- c = ' '
- }
- if c == ' ' && w > 0 && b[w-1] == ' ' {
- continue
- }
- b[w] = c
- w++
- }
- if w > 0 && b[w-1] == ' ' {
- w--
- }
- return b[:w]
-}
-
-// trimSpace trims leading and trailing space from s, returning a subslice of s.
-func trimSpace(s []byte) []byte {
- j := len(s)
- for j > 0 && (s[j-1] == ' ' || s[j-1] == '\t' || s[j-1] == '\n') {
- j--
- }
- i := 0
- for i < j && (s[i] == ' ' || s[i] == '\t') {
- i++
- }
- return s[i:j]
-}
-
-// pcrel matches instructions using relative addressing mode.
-var (
- pcrel = regexp.MustCompile(`^((?:.* )?(?:b|bl)x?(?:eq|ne|cs|cc|mi|pl|vs|vc|hi|ls|ge|lt|gt|le)?) 0x([0-9a-f]+)$`)
-)
-
-// Generators.
-//
-// The test cases are described as functions that invoke a callback repeatedly,
-// with a new input sequence each time. These helpers make writing those
-// a little easier.
-
-// condCases generates conditional instructions.
-func condCases(t *testing.T) func(func([]byte)) {
- return func(try func([]byte)) {
- // All the strides are relatively prime to 2 and therefore to 2²⁸,
- // so we will not repeat any instructions until we have tried all 2²⁸.
- // Using a stride other than 1 is meant to visit the instructions in a
- // pseudorandom order, which gives better variety in the set of
- // test cases chosen by -printtests.
- stride := uint32(10007)
- n := 1 << 28 / 7
- if testing.Short() {
- stride = 100003
- n = 1 << 28 / 1001
- } else if *longTest {
- stride = 200000033
- n = 1 << 28
- }
- x := uint32(0)
- for i := 0; i < n; i++ {
- enc := (x%15)<<28 | x&(1<<28-1)
- try([]byte{byte(enc), byte(enc >> 8), byte(enc >> 16), byte(enc >> 24)})
- x += stride
- }
- }
-}
-
-// uncondCases generates unconditional instructions.
-func uncondCases(t *testing.T) func(func([]byte)) {
- return func(try func([]byte)) {
- condCases(t)(func(enc []byte) {
- enc[3] |= 0xF0
- try(enc)
- })
- }
-}
-
-func countBits(x uint32) int {
- n := 0
- for ; x != 0; x >>= 1 {
- n += int(x & 1)
- }
- return n
-}
-
-func expandBits(x, m uint32) uint32 {
- var out uint32
- for i := uint(0); i < 32; i++ {
- out >>= 1
- if m&1 != 0 {
- out |= (x & 1) << 31
- x >>= 1
- }
- m >>= 1
- }
- return out
-}
-
-func tryCondMask(mask, val uint32, try func([]byte)) {
- n := countBits(^mask)
- bits := uint32(0)
- for i := 0; i < 1<<uint(n); i++ {
- bits += 848251 // arbitrary prime
- x := val | expandBits(bits, ^mask) | uint32(i)%15<<28
- try([]byte{byte(x), byte(x >> 8), byte(x >> 16), byte(x >> 24)})
- }
-}
-
-// vfpCases generates VFP instructions.
-func vfpCases(t *testing.T) func(func([]byte)) {
- const (
- vfpmask uint32 = 0xFF00FE10
- vfp uint32 = 0x0E009A00
- )
- return func(try func([]byte)) {
- tryCondMask(0xff00fe10, 0x0e009a00, try) // standard VFP instruction space
- tryCondMask(0xffc00f7f, 0x0e000b10, try) // VFP MOV core reg to/from float64 half
- tryCondMask(0xffe00f7f, 0x0e000a10, try) // VFP MOV core reg to/from float32
- tryCondMask(0xffef0fff, 0x0ee10a10, try) // VFP MOV core reg to/from cond codes
- }
-}
-
-// hexCases generates the cases written in hexadecimal in the encoded string.
-// Spaces in 'encoded' separate entire test cases, not individual bytes.
-func hexCases(t *testing.T, encoded string) func(func([]byte)) {
- return func(try func([]byte)) {
- for _, x := range strings.Fields(encoded) {
- src, err := hex.DecodeString(x)
- if err != nil {
- t.Errorf("parsing %q: %v", x, err)
- }
- try(src)
- }
- }
-}
-
-// testdataCases generates the test cases recorded in testdata/decode.txt.
-// It only uses the inputs; it ignores the answers recorded in that file.
-func testdataCases(t *testing.T) func(func([]byte)) {
- var codes [][]byte
- data, err := ioutil.ReadFile("testdata/decode.txt")
- if err != nil {
- t.Fatal(err)
- }
- for _, line := range strings.Split(string(data), "\n") {
- line = strings.TrimSpace(line)
- if line == "" || strings.HasPrefix(line, "#") {
- continue
- }
- f := strings.Fields(line)[0]
- i := strings.Index(f, "|")
- if i < 0 {
- t.Errorf("parsing %q: missing | separator", f)
- continue
- }
- if i%2 != 0 {
- t.Errorf("parsing %q: misaligned | separator", f)
- }
- code, err := hex.DecodeString(f[:i] + f[i+1:])
- if err != nil {
- t.Errorf("parsing %q: %v", f, err)
- continue
- }
- codes = append(codes, code)
- }
-
- return func(try func([]byte)) {
- for _, code := range codes {
- try(code)
- }
- }
-}
-
-func caller(skip int) string {
- pc, _, _, _ := runtime.Caller(skip)
- f := runtime.FuncForPC(pc)
- name := "?"
- if f != nil {
- name = f.Name()
- if i := strings.LastIndex(name, "."); i >= 0 {
- name = name[i+1:]
- }
- }
- return name
-}
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