Go 1.13 support (#1546)

* tests: fix tests for Go 1.13

- Go 1.13 doesn't autogenerate init functions anymore, tests that
  expected that now fail and should be skipped.
- Plugin tests now need -gcflags'all=-N -l' now, we were probably
  getting lucky with -gcflags='-N -l' before.

* proc: allow signed integers as shift counts

Go1.13 allows signed integers to be used as the right hand side of a
shift operator, change eval to match.

* goversion: update maximum supported version

* travis: force Go to use vendor directory

Travis scripts get confused by "go: downloading" lines, the exact
reason is not clear. Testing that the vendor directory is up to date is
a good idea anyway.

.travis.yml

@@ -16,4 +16,5 @@ matrix:
     - go: tip
 
 before_install:
+  - export GOFLAGS=-mod=vendor
   - if [ $TRAVIS_OS_NAME = "linux" ]; then sudo apt-get -qq update; sudo apt-get install -y dwz; fi

pkg/goversion/compat.go

@@ -6,7 +6,7 @@ import (
 
 var (
 	minSupportedVersionOfGoMinor = 10
-	maxSupportedVersionOfGoMinor = 12
+	maxSupportedVersionOfGoMinor = 13
 	goTooOldErr                  = fmt.Errorf("Version of Go is too old for this version of Delve (minimum supported version 1.%d, suppress this error with --check-go-version=false)", minSupportedVersionOfGoMinor)
 	dlvTooOldErr                 = fmt.Errorf("Version of Delve is too old for this version of Go (maximum supported version 1.%d, suppress this error with --check-go-version=false)", maxSupportedVersionOfGoMinor)
 )

pkg/proc/eval.go

@@ -927,8 +927,8 @@ func negotiateType(op token.Token, xv, yv *Variable) (godwarf.Type, error) {
 		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
 			// ok
 		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-			if yv.DwarfType != nil || constant.Sign(yv.Value) < 0 {
-				return nil, fmt.Errorf("shift count type %s, must be unsigned integer", yv.Kind.String())
+			if constant.Sign(yv.Value) < 0 {
+				return nil, fmt.Errorf("shift count must not be negative")
 			}
 		default:
 			return nil, fmt.Errorf("shift count type %s, must be unsigned integer", yv.Kind.String())

pkg/proc/proc_test.go

@@ -1810,6 +1810,11 @@ func TestIssue332_Part2(t *testing.T) {
 }
 
 func TestIssue396(t *testing.T) {
+	if goversion.VersionAfterOrEqual(runtime.Version(), 1, 13) {
+		// CL 161337 in Go 1.13 and later removes the autogenerated init function
+		// https://go-review.googlesource.com/c/go/+/161337
+		t.Skip("no autogenerated init function in Go 1.13 or later")
+	}
 	withTestProcess("callme", t, func(p proc.Process, fixture protest.Fixture) {
 		_, err := proc.FindFunctionLocation(p, "main.init", 0)
 		assertNoError(err, t, "FindFunctionLocation()")
@@ -4247,9 +4252,9 @@ func TestDeadlockBreakpoint(t *testing.T) {
 }
 
 func TestListImages(t *testing.T) {
-	pluginFixtures := protest.WithPlugins(t, "plugin1/", "plugin2/")
+	pluginFixtures := protest.WithPlugins(t, protest.AllNonOptimized, "plugin1/", "plugin2/")
 
-	withTestProcessArgs("plugintest", t, ".", []string{pluginFixtures[0].Path, pluginFixtures[1].Path}, 0, func(p proc.Process, fixture protest.Fixture) {
+	withTestProcessArgs("plugintest", t, ".", []string{pluginFixtures[0].Path, pluginFixtures[1].Path}, protest.AllNonOptimized, func(p proc.Process, fixture protest.Fixture) {
 		assertNoError(proc.Continue(p), t, "first continue")
 		f, l := currentLineNumber(p, t)
 		plugin1Found := false
@@ -4367,9 +4372,9 @@ func TestCallConcurrent(t *testing.T) {
 }
 
 func TestPluginStepping(t *testing.T) {
-	pluginFixtures := protest.WithPlugins(t, "plugin1/", "plugin2/")
+	pluginFixtures := protest.WithPlugins(t, protest.AllNonOptimized, "plugin1/", "plugin2/")
 
-	testseq2Args(".", []string{pluginFixtures[0].Path, pluginFixtures[1].Path}, 0, t, "plugintest2", "", []seqTest{
+	testseq2Args(".", []string{pluginFixtures[0].Path, pluginFixtures[1].Path}, protest.AllNonOptimized, t, "plugintest2", "", []seqTest{
 		{contContinue, 41},
 		{contStep, "plugin1.go:9"},
 		{contStep, "plugin1.go:10"},

pkg/proc/test/support.go

@@ -75,6 +75,7 @@ const (
 	EnableDWZCompression
 	BuildModePIE
 	BuildModePlugin
+	AllNonOptimized
 )
 
 // BuildFixture will compile the fixture 'name' using the provided build flags.
@@ -121,7 +122,12 @@ func BuildFixture(name string, flags BuildFlags) Fixture {
 	if flags&EnableOptimization == 0 {
 		gcflagsv = append(gcflagsv, "-N")
 	}
-	gcflags := "-gcflags=" + strings.Join(gcflagsv, " ")
+	var gcflags string
+	if flags&AllNonOptimized != 0 {
+		gcflags = "-gcflags=all=" + strings.Join(gcflagsv, " ")
+	} else {
+		gcflags = "-gcflags=" + strings.Join(gcflagsv, " ")
+	}
 	buildFlags = append(buildFlags, gcflags, "-o", tmpfile)
 	if *EnableRace {
 		buildFlags = append(buildFlags, "-race")
@@ -325,7 +331,7 @@ func DefaultTestBackend(testBackend *string) {
 // The test calling WithPlugins will be skipped if the current combination
 // of OS, architecture and version of GO doesn't support plugins or
 // debugging plugins.
-func WithPlugins(t *testing.T, plugins ...string) []Fixture {
+func WithPlugins(t *testing.T, flags BuildFlags, plugins ...string) []Fixture {
 	if !goversion.VersionAfterOrEqual(runtime.Version(), 1, 12) {
 		t.Skip("versions of Go before 1.12 do not include debug information in packages that import plugin (or they do but it's wrong)")
 	}
@@ -335,7 +341,7 @@ func WithPlugins(t *testing.T, plugins ...string) []Fixture {
 
 	r := make([]Fixture, len(plugins))
 	for i := range plugins {
-		r[i] = BuildFixture(plugins[i], BuildModePlugin)
+		r[i] = BuildFixture(plugins[i], flags|BuildModePlugin)
 	}
 	return r
 }

pkg/terminal/command_test.go

@@ -733,6 +733,13 @@ func TestConfig(t *testing.T) {
 
 func TestDisassembleAutogenerated(t *testing.T) {
 	// Executing the 'disassemble' command on autogenerated code should work correctly
+
+	if goversion.VersionAfterOrEqual(runtime.Version(), 1, 13) {
+		// CL 161337 in Go 1.13 and later removes the autogenerated init function
+		// https://go-review.googlesource.com/c/go/+/161337
+		t.Skip("no autogenerated init function in Go 1.13 or later")
+	}
+
 	withTestTerminal("math", t, func(term *FakeTerminal) {
 		term.MustExec("break main.init")
 		term.MustExec("continue")

service/test/variables_test.go

@@ -733,8 +733,7 @@ func TestEvalExpression(t *testing.T) {
 		{"i2 + p1", false, "", "", "", fmt.Errorf("mismatched types \"int\" and \"*int\"")},
 		{"i2 + f1", false, "", "", "", fmt.Errorf("mismatched types \"int\" and \"float64\"")},
 		{"i2 << f1", false, "", "", "", fmt.Errorf("shift count type float64, must be unsigned integer")},
-		{"i2 << -1", false, "", "", "", fmt.Errorf("shift count type int, must be unsigned integer")},
-		{"i2 << i3", false, "", "", "int", fmt.Errorf("shift count type int, must be unsigned integer")},
+		{"i2 << -1", false, "", "", "", fmt.Errorf("shift count must not be negative")},
 		{"*(i2 + i3)", false, "", "", "", fmt.Errorf("expression \"(i2 + i3)\" (int) can not be dereferenced")},
 		{"i2.member", false, "", "", "", fmt.Errorf("i2 (type int) is not a struct")},
 		{"fmt.Println(\"hello\")", false, "", "", "", fmt.Errorf("function calls not allowed without using 'call'")},
@@ -1356,9 +1355,9 @@ func assertCurrentLocationFunction(p proc.Process, t *testing.T, fnname string)
 }
 
 func TestPluginVariables(t *testing.T) {
-	pluginFixtures := protest.WithPlugins(t, "plugin1/", "plugin2/")
+	pluginFixtures := protest.WithPlugins(t, protest.AllNonOptimized, "plugin1/", "plugin2/")
 
-	withTestProcessArgs("plugintest2", t, ".", []string{pluginFixtures[0].Path, pluginFixtures[1].Path}, 0, func(p proc.Process, fixture protest.Fixture) {
+	withTestProcessArgs("plugintest2", t, ".", []string{pluginFixtures[0].Path, pluginFixtures[1].Path}, protest.AllNonOptimized, func(p proc.Process, fixture protest.Fixture) {
 		setFileLineBreakpoint(p, t, fixture.Source, 41)
 		assertNoError(proc.Continue(p), t, "Continue 1")