decode_test.go

Documentation: golang.org/x/arch/x86/x86asm

     1  // Copyright 2014 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package x86asm
     6  
     7  import (
     8  	"encoding/hex"
     9  	"io/ioutil"
    10  	"strconv"
    11  	"strings"
    12  	"testing"
    13  )
    14  
    15  func TestDecode(t *testing.T) {
    16  	data, err := ioutil.ReadFile("testdata/decode.txt")
    17  	if err != nil {
    18  		t.Fatal(err)
    19  	}
    20  	all := string(data)
    21  	for strings.Contains(all, "\t\t") {
    22  		all = strings.Replace(all, "\t\t", "\t", -1)
    23  	}
    24  	for _, line := range strings.Split(all, "\n") {
    25  		line = strings.TrimSpace(line)
    26  		if line == "" || strings.HasPrefix(line, "#") {
    27  			continue
    28  		}
    29  		f := strings.SplitN(line, "\t", 4)
    30  		i := strings.Index(f[0], "|")
    31  		if i < 0 {
    32  			t.Errorf("parsing %q: missing | separator", f[0])
    33  			continue
    34  		}
    35  		if i%2 != 0 {
    36  			t.Errorf("parsing %q: misaligned | separator", f[0])
    37  		}
    38  		size := i / 2
    39  		code, err := hex.DecodeString(f[0][:i] + f[0][i+1:])
    40  		if err != nil {
    41  			t.Errorf("parsing %q: %v", f[0], err)
    42  			continue
    43  		}
    44  		mode, err := strconv.Atoi(f[1])
    45  		if err != nil {
    46  			t.Errorf("invalid mode %q in: %s", f[1], line)
    47  			continue
    48  		}
    49  		syntax, asm := f[2], f[3]
    50  		inst, err := Decode(code, mode)
    51  		var out string
    52  		if err != nil {
    53  			out = "error: " + err.Error()
    54  		} else {
    55  			switch syntax {
    56  			case "gnu":
    57  				out = GNUSyntax(inst, 0, nil)
    58  			case "intel":
    59  				out = IntelSyntax(inst, 0, nil)
    60  			case "plan9": // [sic]
    61  				out = GoSyntax(inst, 0, nil)
    62  			default:
    63  				t.Errorf("unknown syntax %q", syntax)
    64  				continue
    65  			}
    66  		}
    67  		if out != asm || inst.Len != size {
    68  			t.Errorf("Decode(%s) [%s] = %s, %d, want %s, %d", f[0], syntax, out, inst.Len, asm, size)
    69  		}
    70  	}
    71  }
    72  
    73  func TestDecodeDoesNotCrash(t *testing.T) {
    74  	cases := [...][]byte{
    75  		[]byte{},
    76  		[]byte{0xc5},
    77  		[]byte{0xc4},
    78  	}
    79  	for _, test := range cases {
    80  		_, err := Decode([]byte(test), 64) // the only goal is that this line does not panic
    81  		if err == nil {
    82  			t.Errorf("expected error on invalid instruction %x", test)
    83  		}
    84  	}
    85  }
    86
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