logopt_test.go

Documentation: cmd/compile/internal/logopt

     1  // Copyright 2019 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 logopt
     6  
     7  import (
     8  	"internal/testenv"
     9  	"os"
    10  	"path/filepath"
    11  	"runtime"
    12  	"strings"
    13  	"testing"
    14  )
    15  
    16  const srcCode = `package x
    17  type pair struct {a,b int}
    18  func bar(y *pair) *int {
    19  	return &y.b
    20  }
    21  var a []int
    22  func foo(w, z *pair) *int {
    23  	if *bar(w) > 0 {
    24  		return bar(z)
    25  	}
    26  	if a[1] > 0 {
    27  		a = a[:2]
    28  	}
    29  	return &a[0]
    30  }
    31  
    32  // address taking prevents closure inlining
    33  func n() int {
    34  	foo := func() int { return 1 }
    35  	bar := &foo
    36  	x := (*bar)() + foo()
    37  	return x
    38  }
    39  `
    40  
    41  func want(t *testing.T, out string, desired string) {
    42  	// On Windows, Unicode escapes in the JSON output end up "normalized" elsewhere to /u....,
    43  	// so "normalize" what we're looking for to match that.
    44  	s := strings.ReplaceAll(desired, string(os.PathSeparator), "/")
    45  	if !strings.Contains(out, s) {
    46  		t.Errorf("did not see phrase %s in \n%s", s, out)
    47  	}
    48  }
    49  
    50  func wantN(t *testing.T, out string, desired string, n int) {
    51  	if strings.Count(out, desired) != n {
    52  		t.Errorf("expected exactly %d occurrences of %s in \n%s", n, desired, out)
    53  	}
    54  }
    55  
    56  func TestPathStuff(t *testing.T) {
    57  	sep := string(filepath.Separator)
    58  	if path, whine := parseLogPath("file:///c:foo"); path != "c:foo" || whine != "" { // good path
    59  		t.Errorf("path='%s', whine='%s'", path, whine)
    60  	}
    61  	if path, whine := parseLogPath("file:///foo"); path != sep+"foo" || whine != "" { // good path
    62  		t.Errorf("path='%s', whine='%s'", path, whine)
    63  	}
    64  	if path, whine := parseLogPath("foo"); path != "" || whine == "" { // BAD path
    65  		t.Errorf("path='%s', whine='%s'", path, whine)
    66  	}
    67  	if sep == "\\" { // On WINDOWS ONLY
    68  		if path, whine := parseLogPath("C:/foo"); path != "C:\\foo" || whine != "" { // good path
    69  			t.Errorf("path='%s', whine='%s'", path, whine)
    70  		}
    71  		if path, whine := parseLogPath("c:foo"); path != "" || whine == "" { // BAD path
    72  			t.Errorf("path='%s', whine='%s'", path, whine)
    73  		}
    74  		if path, whine := parseLogPath("/foo"); path != "" || whine == "" { // BAD path
    75  			t.Errorf("path='%s', whine='%s'", path, whine)
    76  		}
    77  	} else { // ON UNIX ONLY
    78  		if path, whine := parseLogPath("/foo"); path != sep+"foo" || whine != "" { // good path
    79  			t.Errorf("path='%s', whine='%s'", path, whine)
    80  		}
    81  	}
    82  }
    83  
    84  func TestLogOpt(t *testing.T) {
    85  	t.Parallel()
    86  
    87  	testenv.MustHaveGoBuild(t)
    88  
    89  	dir := fixSlash(t.TempDir()) // Normalize the directory name as much as possible, for Windows testing
    90  	src := filepath.Join(dir, "file.go")
    91  	if err := os.WriteFile(src, []byte(srcCode), 0644); err != nil {
    92  		t.Fatal(err)
    93  	}
    94  
    95  	outfile := filepath.Join(dir, "file.o")
    96  
    97  	t.Run("JSON_fails", func(t *testing.T) {
    98  		// Test malformed flag
    99  		out, err := testLogOpt(t, "-json=foo", src, outfile)
   100  		if err == nil {
   101  			t.Error("-json=foo succeeded unexpectedly")
   102  		}
   103  		want(t, out, "option should be")
   104  		want(t, out, "number")
   105  
   106  		// Test a version number that is currently unsupported (and should remain unsupported for a while)
   107  		out, err = testLogOpt(t, "-json=9,foo", src, outfile)
   108  		if err == nil {
   109  			t.Error("-json=0,foo succeeded unexpectedly")
   110  		}
   111  		want(t, out, "version must be")
   112  
   113  	})
   114  
   115  	// replace d (dir)  with t ("tmpdir") and convert path separators to '/'
   116  	normalize := func(out []byte, d, t string) string {
   117  		s := string(out)
   118  		s = strings.ReplaceAll(s, d, t)
   119  		s = strings.ReplaceAll(s, string(os.PathSeparator), "/")
   120  		return s
   121  	}
   122  
   123  	// Ensure that <128 byte copies are not reported and that 128-byte copies are.
   124  	// Check at both 1 and 8-byte alignments.
   125  	t.Run("Copy", func(t *testing.T) {
   126  		const copyCode = `package x
   127  func s128a1(x *[128]int8) [128]int8 {
   128  	return *x
   129  }
   130  func s127a1(x *[127]int8) [127]int8 {
   131  	return *x
   132  }
   133  func s16a8(x *[16]int64) [16]int64 {
   134  	return *x
   135  }
   136  func s15a8(x *[15]int64) [15]int64 {
   137  	return *x
   138  }
   139  `
   140  		copy := filepath.Join(dir, "copy.go")
   141  		if err := os.WriteFile(copy, []byte(copyCode), 0644); err != nil {
   142  			t.Fatal(err)
   143  		}
   144  		outcopy := filepath.Join(dir, "copy.o")
   145  
   146  		// On not-amd64, test the host architecture and os
   147  		arches := []string{runtime.GOARCH}
   148  		goos0 := runtime.GOOS
   149  		if runtime.GOARCH == "amd64" { // Test many things with "linux" (wasm will get "js")
   150  			arches = []string{"arm", "arm64", "386", "amd64", "mips", "mips64", "loong64", "ppc64le", "riscv64", "s390x", "wasm"}
   151  			goos0 = "linux"
   152  		}
   153  
   154  		for _, arch := range arches {
   155  			t.Run(arch, func(t *testing.T) {
   156  				goos := goos0
   157  				if arch == "wasm" {
   158  					goos = "js"
   159  				}
   160  				_, err := testCopy(t, dir, arch, goos, copy, outcopy)
   161  				if err != nil {
   162  					t.Error("-json=0,file://log/opt should have succeeded")
   163  				}
   164  				logged, err := os.ReadFile(filepath.Join(dir, "log", "opt", "x", "copy.json"))
   165  				if err != nil {
   166  					t.Error("-json=0,file://log/opt missing expected log file")
   167  				}
   168  				slogged := normalize(logged, string(uriIfy(dir)), string(uriIfy("tmpdir")))
   169  				t.Logf("%s", slogged)
   170  				want(t, slogged, `{"range":{"start":{"line":3,"character":2},"end":{"line":3,"character":2}},"severity":3,"code":"copy","source":"go compiler","message":"128 bytes"}`)
   171  				want(t, slogged, `{"range":{"start":{"line":9,"character":2},"end":{"line":9,"character":2}},"severity":3,"code":"copy","source":"go compiler","message":"128 bytes"}`)
   172  				wantN(t, slogged, `"code":"copy"`, 2)
   173  			})
   174  		}
   175  	})
   176  
   177  	// Some architectures don't fault on nil dereference, so nilchecks are eliminated differently.
   178  	// The N-way copy test also doesn't need to run N-ways N times.
   179  	if runtime.GOARCH != "amd64" {
   180  		return
   181  	}
   182  
   183  	t.Run("Success", func(t *testing.T) {
   184  		// This test is supposed to succeed
   185  
   186  		// Note 'file://' is the I-Know-What-I-Am-Doing way of specifying a file, also to deal with corner cases for Windows.
   187  		_, err := testLogOptDir(t, dir, "-json=0,file://log/opt", src, outfile)
   188  		if err != nil {
   189  			t.Error("-json=0,file://log/opt should have succeeded")
   190  		}
   191  		logged, err := os.ReadFile(filepath.Join(dir, "log", "opt", "x", "file.json"))
   192  		if err != nil {
   193  			t.Error("-json=0,file://log/opt missing expected log file")
   194  		}
   195  		// All this delicacy with uriIfy and filepath.Join is to get this test to work right on Windows.
   196  		slogged := normalize(logged, string(uriIfy(dir)), string(uriIfy("tmpdir")))
   197  		t.Logf("%s", slogged)
   198  		// below shows proper nilcheck
   199  		want(t, slogged, `{"range":{"start":{"line":9,"character":13},"end":{"line":9,"character":13}},"severity":3,"code":"nilcheck","source":"go compiler","message":"",`+
   200  			`"relatedInformation":[{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":4,"character":11},"end":{"line":4,"character":11}}},"message":"inlineLoc"}]}`)
   201  		want(t, slogged, `{"range":{"start":{"line":11,"character":6},"end":{"line":11,"character":6}},"severity":3,"code":"isInBounds","source":"go compiler","message":""}`)
   202  		want(t, slogged, `{"range":{"start":{"line":7,"character":6},"end":{"line":7,"character":6}},"severity":3,"code":"canInlineFunction","source":"go compiler","message":"cost: 35"}`)
   203  		// escape analysis explanation
   204  		want(t, slogged, `{"range":{"start":{"line":7,"character":13},"end":{"line":7,"character":13}},"severity":3,"code":"leak","source":"go compiler","message":"parameter z leaks to ~r0 with derefs=0",`+
   205  			`"relatedInformation":[`+
   206  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":13},"end":{"line":9,"character":13}}},"message":"escflow:    flow: y = z:"},`+
   207  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":13},"end":{"line":9,"character":13}}},"message":"escflow:      from y := z (assign-pair)"},`+
   208  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":13},"end":{"line":9,"character":13}}},"message":"escflow:    flow: ~r0 = y:"},`+
   209  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":4,"character":11},"end":{"line":4,"character":11}}},"message":"inlineLoc"},`+
   210  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":13},"end":{"line":9,"character":13}}},"message":"escflow:      from y.b (dot of pointer)"},`+
   211  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":4,"character":11},"end":{"line":4,"character":11}}},"message":"inlineLoc"},`+
   212  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":13},"end":{"line":9,"character":13}}},"message":"escflow:      from \u0026y.b (address-of)"},`+
   213  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":4,"character":9},"end":{"line":4,"character":9}}},"message":"inlineLoc"},`+
   214  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":13},"end":{"line":9,"character":13}}},"message":"escflow:      from ~r0 = \u0026y.b (assign-pair)"},`+
   215  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":3},"end":{"line":9,"character":3}}},"message":"escflow:    flow: ~r0 = ~r0:"},`+
   216  			`{"location":{"uri":"file://tmpdir/file.go","range":{"start":{"line":9,"character":3},"end":{"line":9,"character":3}}},"message":"escflow:      from return ~r0 (return)"}]}`)
   217  	})
   218  }
   219  
   220  func testLogOpt(t *testing.T, flag, src, outfile string) (string, error) {
   221  	run := []string{testenv.GoToolPath(t), "tool", "compile", "-p=p", flag, "-o", outfile, src}
   222  	t.Log(run)
   223  	cmd := testenv.Command(t, run[0], run[1:]...)
   224  	out, err := cmd.CombinedOutput()
   225  	t.Logf("%s", out)
   226  	return string(out), err
   227  }
   228  
   229  func testLogOptDir(t *testing.T, dir, flag, src, outfile string) (string, error) {
   230  	// Notice the specified import path "x"
   231  	run := []string{testenv.GoToolPath(t), "tool", "compile", "-p=x", flag, "-o", outfile, src}
   232  	t.Log(run)
   233  	cmd := testenv.Command(t, run[0], run[1:]...)
   234  	cmd.Dir = dir
   235  	out, err := cmd.CombinedOutput()
   236  	t.Logf("%s", out)
   237  	return string(out), err
   238  }
   239  
   240  func testCopy(t *testing.T, dir, goarch, goos, src, outfile string) (string, error) {
   241  	// Notice the specified import path "x"
   242  	run := []string{testenv.GoToolPath(t), "tool", "compile", "-p=x", "-json=0,file://log/opt", "-o", outfile, src}
   243  	t.Log(run)
   244  	cmd := testenv.Command(t, run[0], run[1:]...)
   245  	cmd.Dir = dir
   246  	cmd.Env = append(os.Environ(), "GOARCH="+goarch, "GOOS="+goos)
   247  	out, err := cmd.CombinedOutput()
   248  	t.Logf("%s", out)
   249  	return string(out), err
   250  }
   251
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