go dwarf_test 源码
golang dwarf_test 代码
文件路径：/src/cmd/link/internal/ld/dwarf_test.go
// Copyright 2017 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 ld
import (
intdwarf "cmd/internal/dwarf"
objfilepkg "cmd/internal/objfile" // renamed to avoid conflict with objfile function
"cmd/link/internal/dwtest"
"debug/dwarf"
"debug/pe"
"fmt"
"internal/buildcfg"
"internal/testenv"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"reflect"
"runtime"
"sort"
"strconv"
"strings"
"testing"
)
const (
DefaultOpt = "-gcflags="
NoOpt = "-gcflags=-l -N"
OptInl4 = "-gcflags=-l=4"
OptAllInl4 = "-gcflags=all=-l=4"
)
func TestRuntimeTypesPresent(t *testing.T) {
t.Parallel()
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
dir := t.TempDir()
f := gobuild(t, dir, `package main; func main() { }`, NoOpt)
defer f.Close()
dwarf, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
want := map[string]bool{
"runtime._type": true,
"runtime.arraytype": true,
"runtime.chantype": true,
"runtime.functype": true,
"runtime.maptype": true,
"runtime.ptrtype": true,
"runtime.slicetype": true,
"runtime.structtype": true,
"runtime.interfacetype": true,
"runtime.itab": true,
"runtime.imethod": true,
}
found := findTypes(t, dwarf, want)
if len(found) != len(want) {
t.Errorf("found %v, want %v", found, want)
}
}
func findTypes(t *testing.T, dw *dwarf.Data, want map[string]bool) (found map[string]bool) {
found = make(map[string]bool)
rdr := dw.Reader()
for entry, err := rdr.Next(); entry != nil; entry, err = rdr.Next() {
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
switch entry.Tag {
case dwarf.TagTypedef:
if name, ok := entry.Val(dwarf.AttrName).(string); ok && want[name] {
found[name] = true
}
}
}
return
}
type builtFile struct {
*objfilepkg.File
path string
}
func gobuild(t *testing.T, dir string, testfile string, gcflags string) *builtFile {
src := filepath.Join(dir, "test.go")
dst := filepath.Join(dir, "out.exe")
if err := ioutil.WriteFile(src, []byte(testfile), 0666); err != nil {
t.Fatal(err)
}
cmd := exec.Command(testenv.GoToolPath(t), "build", gcflags, "-o", dst, src)
b, err := cmd.CombinedOutput()
if len(b) != 0 {
t.Logf("## build output:\n%s", b)
}
if err != nil {
t.Fatalf("build error: %v", err)
}
f, err := objfilepkg.Open(dst)
if err != nil {
t.Fatal(err)
}
return &builtFile{f, dst}
}
// Similar to gobuild() above, but uses a main package instead of a test.go file.
func gobuildTestdata(t *testing.T, tdir string, pkgDir string, gcflags string) *builtFile {
dst := filepath.Join(tdir, "out.exe")
// Run a build with an updated GOPATH
cmd := exec.Command(testenv.GoToolPath(t), "build", gcflags, "-o", dst)
cmd.Dir = pkgDir
if b, err := cmd.CombinedOutput(); err != nil {
t.Logf("build: %s\n", b)
t.Fatalf("build error: %v", err)
}
f, err := objfilepkg.Open(dst)
if err != nil {
t.Fatal(err)
}
return &builtFile{f, dst}
}
func TestEmbeddedStructMarker(t *testing.T) {
t.Parallel()
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
const prog = `
package main
import "fmt"
type Foo struct { v int }
type Bar struct {
Foo
name string
}
type Baz struct {
*Foo
name string
}
func main() {
bar := Bar{ Foo: Foo{v: 123}, name: "onetwothree"}
baz := Baz{ Foo: &bar.Foo, name: "123" }
fmt.Println(bar, baz)
}`
want := map[string]map[string]bool{
"main.Foo": {"v": false},
"main.Bar": {"Foo": true, "name": false},
"main.Baz": {"Foo": true, "name": false},
}
dir := t.TempDir()
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
for entry, err := rdr.Next(); entry != nil; entry, err = rdr.Next() {
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
switch entry.Tag {
case dwarf.TagStructType:
name := entry.Val(dwarf.AttrName).(string)
wantMembers := want[name]
if wantMembers == nil {
continue
}
gotMembers, err := findMembers(rdr)
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
if !reflect.DeepEqual(gotMembers, wantMembers) {
t.Errorf("type %v: got map[member]embedded = %+v, want %+v", name, wantMembers, gotMembers)
}
delete(want, name)
}
}
if len(want) != 0 {
t.Errorf("failed to check all expected types: missing types = %+v", want)
}
}
func findMembers(rdr *dwarf.Reader) (map[string]bool, error) {
memberEmbedded := map[string]bool{}
// TODO(hyangah): define in debug/dwarf package
const goEmbeddedStruct = dwarf.Attr(intdwarf.DW_AT_go_embedded_field)
for entry, err := rdr.Next(); entry != nil; entry, err = rdr.Next() {
if err != nil {
return nil, err
}
switch entry.Tag {
case dwarf.TagMember:
name := entry.Val(dwarf.AttrName).(string)
embedded := entry.Val(goEmbeddedStruct).(bool)
memberEmbedded[name] = embedded
case 0:
return memberEmbedded, nil
}
}
return memberEmbedded, nil
}
func TestSizes(t *testing.T) {
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
// External linking may bring in C symbols with unknown size. Skip.
testenv.MustInternalLink(t)
t.Parallel()
// DWARF sizes should never be -1.
// See issue #21097
const prog = `
package main
var x func()
var y [4]func()
func main() {
x = nil
y[0] = nil
}
`
dir := t.TempDir()
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
for entry, err := rdr.Next(); entry != nil; entry, err = rdr.Next() {
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
switch entry.Tag {
case dwarf.TagArrayType, dwarf.TagPointerType, dwarf.TagStructType, dwarf.TagBaseType, dwarf.TagSubroutineType, dwarf.TagTypedef:
default:
continue
}
typ, err := d.Type(entry.Offset)
if err != nil {
t.Fatalf("can't read type: %v", err)
}
if typ.Size() < 0 {
t.Errorf("subzero size %s %s %T", typ, entry.Tag, typ)
}
}
}
func TestFieldOverlap(t *testing.T) {
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
// This test grew out of issue 21094, where specific sudog<T> DWARF types
// had elem fields set to values instead of pointers.
const prog = `
package main
var c chan string
func main() {
c <- "foo"
}
`
dir := t.TempDir()
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
for entry, err := rdr.Next(); entry != nil; entry, err = rdr.Next() {
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
if entry.Tag != dwarf.TagStructType {
continue
}
typ, err := d.Type(entry.Offset)
if err != nil {
t.Fatalf("can't read type: %v", err)
}
s := typ.(*dwarf.StructType)
for i := 0; i < len(s.Field); i++ {
end := s.Field[i].ByteOffset + s.Field[i].Type.Size()
var limit int64
if i == len(s.Field)-1 {
limit = s.Size()
} else {
limit = s.Field[i+1].ByteOffset
}
if end > limit {
name := entry.Val(dwarf.AttrName).(string)
t.Fatalf("field %s.%s overlaps next field", name, s.Field[i].Name)
}
}
}
}
func varDeclCoordsAndSubrogramDeclFile(t *testing.T, testpoint string, expectFile string, expectLine int, directive string) {
t.Parallel()
prog := fmt.Sprintf("package main\n%s\nfunc main() {\n\nvar i int\ni = i\n}\n", directive)
dir := t.TempDir()
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
// Locate the main.main DIE
mains := ex.Named("main.main")
if len(mains) == 0 {
t.Fatalf("unable to locate DIE for main.main")
}
if len(mains) != 1 {
t.Fatalf("more than one main.main DIE")
}
maindie := mains[0]
// Vet the main.main DIE
if maindie.Tag != dwarf.TagSubprogram {
t.Fatalf("unexpected tag %v on main.main DIE", maindie.Tag)
}
// Walk main's children and select variable "i".
mainIdx := ex.IdxFromOffset(maindie.Offset)
childDies := ex.Children(mainIdx)
var iEntry *dwarf.Entry
for _, child := range childDies {
if child.Tag == dwarf.TagVariable && child.Val(dwarf.AttrName).(string) == "i" {
iEntry = child
break
}
}
if iEntry == nil {
t.Fatalf("didn't find DW_TAG_variable for i in main.main")
}
// Verify line/file attributes.
line := iEntry.Val(dwarf.AttrDeclLine)
if line == nil || line.(int64) != int64(expectLine) {
t.Errorf("DW_AT_decl_line for i is %v, want %d", line, expectLine)
}
fileIdx, fileIdxOK := maindie.Val(dwarf.AttrDeclFile).(int64)
if !fileIdxOK {
t.Errorf("missing or invalid DW_AT_decl_file for main")
}
file, err := ex.FileRef(d, mainIdx, fileIdx)
if err != nil {
t.Fatalf("FileRef: %v", err)
}
base := filepath.Base(file)
if base != expectFile {
t.Errorf("DW_AT_decl_file for main is %v, want %v", base, expectFile)
}
}
func TestVarDeclCoordsAndSubrogramDeclFile(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
varDeclCoordsAndSubrogramDeclFile(t, "TestVarDeclCoords", "test.go", 5, "")
}
func TestVarDeclCoordsWithLineDirective(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
varDeclCoordsAndSubrogramDeclFile(t, "TestVarDeclCoordsWithLineDirective",
"foobar.go", 202, "//line /foobar.go:200")
}
func TestInlinedRoutineRecords(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
const prog = `
package main
var G int
func noinline(x int) int {
defer func() { G += x }()
return x
}
func cand(x, y int) int {
return noinline(x+y) ^ (y - x)
}
func main() {
x := cand(G*G,G|7%G)
G = x
}
`
dir := t.TempDir()
// Note: this is a build with "-l=4", as opposed to "-l -N". The
// test is intended to verify DWARF that is only generated when
// the inliner is active. We're only going to look at the DWARF for
// main.main, however, hence we build with "-gcflags=-l=4" as opposed
// to "-gcflags=all=-l=4".
f := gobuild(t, dir, prog, OptInl4)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
// The inlined subroutines we expect to visit
expectedInl := []string{"main.cand"}
rdr := d.Reader()
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
// Locate the main.main DIE
mains := ex.Named("main.main")
if len(mains) == 0 {
t.Fatalf("unable to locate DIE for main.main")
}
if len(mains) != 1 {
t.Fatalf("more than one main.main DIE")
}
maindie := mains[0]
// Vet the main.main DIE
if maindie.Tag != dwarf.TagSubprogram {
t.Fatalf("unexpected tag %v on main.main DIE", maindie.Tag)
}
// Walk main's children and pick out the inlined subroutines
mainIdx := ex.IdxFromOffset(maindie.Offset)
childDies := ex.Children(mainIdx)
exCount := 0
for _, child := range childDies {
if child.Tag == dwarf.TagInlinedSubroutine {
// Found an inlined subroutine, locate abstract origin.
ooff, originOK := child.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
if !originOK {
t.Fatalf("no abstract origin attr for inlined subroutine at offset %v", child.Offset)
}
originDIE := ex.EntryFromOffset(ooff)
if originDIE == nil {
t.Fatalf("can't locate origin DIE at off %v", ooff)
}
// Walk the children of the abstract subroutine. We expect
// to see child variables there, even if (perhaps due to
// optimization) there are no references to them from the
// inlined subroutine DIE.
absFcnIdx := ex.IdxFromOffset(ooff)
absFcnChildDies := ex.Children(absFcnIdx)
if len(absFcnChildDies) != 2 {
t.Fatalf("expected abstract function: expected 2 children, got %d children", len(absFcnChildDies))
}
formalCount := 0
for _, absChild := range absFcnChildDies {
if absChild.Tag == dwarf.TagFormalParameter {
formalCount += 1
continue
}
t.Fatalf("abstract function child DIE: expected formal, got %v", absChild.Tag)
}
if formalCount != 2 {
t.Fatalf("abstract function DIE: expected 2 formals, got %d", formalCount)
}
if exCount >= len(expectedInl) {
t.Fatalf("too many inlined subroutines found in main.main")
}
// Name should check out.
expected := expectedInl[exCount]
if name, ok := originDIE.Val(dwarf.AttrName).(string); ok {
if name != expected {
t.Fatalf("expected inlined routine %s got %s", name, expected)
}
}
exCount++
// Verify that the call_file attribute for the inlined
// instance is ok. In this case it should match the file
// for the main routine. To do this we need to locate the
// compilation unit DIE that encloses what we're looking
// at; this can be done with the examiner.
cf, cfOK := child.Val(dwarf.AttrCallFile).(int64)
if !cfOK {
t.Fatalf("no call_file attr for inlined subroutine at offset %v", child.Offset)
}
file, err := ex.FileRef(d, mainIdx, cf)
if err != nil {
t.Errorf("FileRef: %v", err)
continue
}
base := filepath.Base(file)
if base != "test.go" {
t.Errorf("bad call_file attribute, found '%s', want '%s'",
file, "test.go")
}
omap := make(map[dwarf.Offset]bool)
// Walk the child variables of the inlined routine. Each
// of them should have a distinct abstract origin-- if two
// vars point to the same origin things are definitely broken.
inlIdx := ex.IdxFromOffset(child.Offset)
inlChildDies := ex.Children(inlIdx)
for _, k := range inlChildDies {
ooff, originOK := k.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
if !originOK {
t.Fatalf("no abstract origin attr for child of inlined subroutine at offset %v", k.Offset)
}
if _, found := omap[ooff]; found {
t.Fatalf("duplicate abstract origin at child of inlined subroutine at offset %v", k.Offset)
}
omap[ooff] = true
}
}
}
if exCount != len(expectedInl) {
t.Fatalf("not enough inlined subroutines found in main.main")
}
}
func abstractOriginSanity(t *testing.T, pkgDir string, flags string) {
t.Parallel()
dir := t.TempDir()
// Build with inlining, to exercise DWARF inlining support.
f := gobuildTestdata(t, dir, filepath.Join(pkgDir, "main"), flags)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
// Make a pass through all DIEs looking for abstract origin
// references.
abscount := 0
for i, die := range ex.DIEs() {
// Does it have an abstract origin?
ooff, originOK := die.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
if !originOK {
continue
}
// All abstract origin references should be resolvable.
abscount += 1
originDIE := ex.EntryFromOffset(ooff)
if originDIE == nil {
ex.DumpEntry(i, false, 0)
t.Fatalf("unresolved abstract origin ref in DIE at offset 0x%x\n", die.Offset)
}
// Suppose that DIE X has parameter/variable children {K1,
// K2, ... KN}. If X has an abstract origin of A, then for
// each KJ, the abstract origin of KJ should be a child of A.
// Note that this same rule doesn't hold for non-variable DIEs.
pidx := ex.IdxFromOffset(die.Offset)
if pidx < 0 {
t.Fatalf("can't locate DIE id")
}
kids := ex.Children(pidx)
for _, kid := range kids {
if kid.Tag != dwarf.TagVariable &&
kid.Tag != dwarf.TagFormalParameter {
continue
}
kooff, originOK := kid.Val(dwarf.AttrAbstractOrigin).(dwarf.Offset)
if !originOK {
continue
}
childOriginDIE := ex.EntryFromOffset(kooff)
if childOriginDIE == nil {
ex.DumpEntry(i, false, 0)
t.Fatalf("unresolved abstract origin ref in DIE at offset %x", kid.Offset)
}
coidx := ex.IdxFromOffset(childOriginDIE.Offset)
childOriginParent := ex.Parent(coidx)
if childOriginParent != originDIE {
ex.DumpEntry(i, false, 0)
t.Fatalf("unexpected parent of abstract origin DIE at offset %v", childOriginDIE.Offset)
}
}
}
if abscount == 0 {
t.Fatalf("no abstract origin refs found, something is wrong")
}
}
func TestAbstractOriginSanity(t *testing.T) {
testenv.MustHaveGoBuild(t)
if testing.Short() {
t.Skip("skipping test in short mode.")
}
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
if wd, err := os.Getwd(); err == nil {
gopathdir := filepath.Join(wd, "testdata", "httptest")
abstractOriginSanity(t, gopathdir, OptAllInl4)
} else {
t.Fatalf("os.Getwd() failed %v", err)
}
}
func TestAbstractOriginSanityIssue25459(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
if runtime.GOARCH != "amd64" && runtime.GOARCH != "386" {
t.Skip("skipping on not-amd64 not-386; location lists not supported")
}
if wd, err := os.Getwd(); err == nil {
gopathdir := filepath.Join(wd, "testdata", "issue25459")
abstractOriginSanity(t, gopathdir, DefaultOpt)
} else {
t.Fatalf("os.Getwd() failed %v", err)
}
}
func TestAbstractOriginSanityIssue26237(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
if wd, err := os.Getwd(); err == nil {
gopathdir := filepath.Join(wd, "testdata", "issue26237")
abstractOriginSanity(t, gopathdir, DefaultOpt)
} else {
t.Fatalf("os.Getwd() failed %v", err)
}
}
func TestRuntimeTypeAttrInternal(t *testing.T) {
testenv.MustHaveGoBuild(t)
testenv.MustInternalLink(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
if runtime.GOOS == "windows" {
t.Skip("skipping on windows; test is incompatible with relocatable binaries")
}
testRuntimeTypeAttr(t, "-ldflags=-linkmode=internal")
}
// External linking requires a host linker (https://golang.org/src/cmd/cgo/doc.go l.732)
func TestRuntimeTypeAttrExternal(t *testing.T) {
testenv.MustHaveGoBuild(t)
testenv.MustHaveCGO(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
// Explicitly test external linking, for dsymutil compatibility on Darwin.
if runtime.GOARCH == "ppc64" {
t.Skip("-linkmode=external not supported on ppc64")
}
if runtime.GOOS == "windows" {
t.Skip("skipping on windows; test is incompatible with relocatable binaries")
}
testRuntimeTypeAttr(t, "-ldflags=-linkmode=external")
}
func testRuntimeTypeAttr(t *testing.T, flags string) {
t.Parallel()
const prog = `
package main
import "unsafe"
type X struct{ _ int }
func main() {
var x interface{} = &X{}
p := *(*uintptr)(unsafe.Pointer(&x))
print(p)
}
`
dir := t.TempDir()
f := gobuild(t, dir, prog, flags)
defer f.Close()
out, err := exec.Command(f.path).CombinedOutput()
if err != nil {
t.Fatalf("could not run test program: %v", err)
}
addr, err := strconv.ParseUint(string(out), 10, 64)
if err != nil {
t.Fatalf("could not parse type address from program output %q: %v", out, err)
}
symbols, err := f.Symbols()
if err != nil {
t.Fatalf("error reading symbols: %v", err)
}
var types *objfilepkg.Sym
for _, sym := range symbols {
if sym.Name == "runtime.types" {
types = &sym
break
}
}
if types == nil {
t.Fatal("couldn't find runtime.types in symbols")
}
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
dies := ex.Named("*main.X")
if len(dies) != 1 {
t.Fatalf("wanted 1 DIE named *main.X, found %v", len(dies))
}
rtAttr := dies[0].Val(intdwarf.DW_AT_go_runtime_type)
if rtAttr == nil {
t.Fatalf("*main.X DIE had no runtime type attr. DIE: %v", dies[0])
}
if runtime.GOOS == "darwin" && runtime.GOARCH == "arm64" {
return // everything is PIE on ARM64, addresses are relocated
}
if rtAttr.(uint64)+types.Addr != addr {
t.Errorf("DWARF type offset was %#x+%#x, but test program said %#x", rtAttr.(uint64), types.Addr, addr)
}
}
func TestIssue27614(t *testing.T) {
// Type references in debug_info should always use the DW_TAG_typedef_type
// for the type, when that's generated.
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
dir := t.TempDir()
const prog = `package main
import "fmt"
type astruct struct {
X int
}
type bstruct struct {
X float32
}
var globalptr *astruct
var globalvar astruct
var bvar0, bvar1, bvar2 bstruct
func main() {
fmt.Println(globalptr, globalvar, bvar0, bvar1, bvar2)
}
`
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
data, err := f.DWARF()
if err != nil {
t.Fatal(err)
}
rdr := data.Reader()
var astructTypeDIE, bstructTypeDIE, ptrastructTypeDIE *dwarf.Entry
var globalptrDIE, globalvarDIE *dwarf.Entry
var bvarDIE [3]*dwarf.Entry
for {
e, err := rdr.Next()
if err != nil {
t.Fatal(err)
}
if e == nil {
break
}
name, _ := e.Val(dwarf.AttrName).(string)
switch e.Tag {
case dwarf.TagTypedef:
switch name {
case "main.astruct":
astructTypeDIE = e
case "main.bstruct":
bstructTypeDIE = e
}
case dwarf.TagPointerType:
if name == "*main.astruct" {
ptrastructTypeDIE = e
}
case dwarf.TagVariable:
switch name {
case "main.globalptr":
globalptrDIE = e
case "main.globalvar":
globalvarDIE = e
default:
const bvarprefix = "main.bvar"
if strings.HasPrefix(name, bvarprefix) {
i, _ := strconv.Atoi(name[len(bvarprefix):])
bvarDIE[i] = e
}
}
}
}
typedieof := func(e *dwarf.Entry) dwarf.Offset {
return e.Val(dwarf.AttrType).(dwarf.Offset)
}
if off := typedieof(ptrastructTypeDIE); off != astructTypeDIE.Offset {
t.Errorf("type attribute of *main.astruct references %#x, not main.astruct DIE at %#x\n", off, astructTypeDIE.Offset)
}
if off := typedieof(globalptrDIE); off != ptrastructTypeDIE.Offset {
t.Errorf("type attribute of main.globalptr references %#x, not *main.astruct DIE at %#x\n", off, ptrastructTypeDIE.Offset)
}
if off := typedieof(globalvarDIE); off != astructTypeDIE.Offset {
t.Errorf("type attribute of main.globalvar1 references %#x, not main.astruct DIE at %#x\n", off, astructTypeDIE.Offset)
}
for i := range bvarDIE {
if off := typedieof(bvarDIE[i]); off != bstructTypeDIE.Offset {
t.Errorf("type attribute of main.bvar%d references %#x, not main.bstruct DIE at %#x\n", i, off, bstructTypeDIE.Offset)
}
}
}
func TestStaticTmp(t *testing.T) {
// Checks that statictmp variables do not appear in debug_info or the
// symbol table.
// Also checks that statictmp variables do not collide with user defined
// variables (issue #25113)
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
dir := t.TempDir()
const prog = `package main
var stmp_0 string
var a []int
func init() {
a = []int{ 7 }
}
func main() {
println(a[0])
}
`
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
for {
e, err := rdr.Next()
if err != nil {
t.Fatal(err)
}
if e == nil {
break
}
if e.Tag != dwarf.TagVariable {
continue
}
name, ok := e.Val(dwarf.AttrName).(string)
if !ok {
continue
}
if strings.Contains(name, "stmp") {
t.Errorf("statictmp variable found in debug_info: %s at %x", name, e.Offset)
}
}
// When external linking, we put all symbols in the symbol table (so the
// external linker can find them). Skip the symbol table check.
// TODO: maybe there is some way to tell the external linker not to put
// those symbols in the executable's symbol table? Prefix the symbol name
// with "." or "L" to pretend it is a label?
if !testenv.CanInternalLink() {
return
}
syms, err := f.Symbols()
if err != nil {
t.Fatalf("error reading symbols: %v", err)
}
for _, sym := range syms {
if strings.Contains(sym.Name, "stmp") {
t.Errorf("statictmp variable found in symbol table: %s", sym.Name)
}
}
}
func TestPackageNameAttr(t *testing.T) {
const dwarfAttrGoPackageName = dwarf.Attr(0x2905)
const dwarfGoLanguage = 22
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
dir := t.TempDir()
const prog = "package main\nfunc main() {\nprintln(\"hello world\")\n}\n"
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
runtimeUnitSeen := false
for {
e, err := rdr.Next()
if err != nil {
t.Fatal(err)
}
if e == nil {
break
}
if e.Tag != dwarf.TagCompileUnit {
continue
}
if lang, _ := e.Val(dwarf.AttrLanguage).(int64); lang != dwarfGoLanguage {
continue
}
pn, ok := e.Val(dwarfAttrGoPackageName).(string)
if !ok {
name, _ := e.Val(dwarf.AttrName).(string)
t.Errorf("found compile unit without package name: %s", name)
}
if pn == "" {
name, _ := e.Val(dwarf.AttrName).(string)
t.Errorf("found compile unit with empty package name: %s", name)
} else {
if pn == "runtime" {
runtimeUnitSeen = true
}
}
}
// Something is wrong if there's no runtime compilation unit.
if !runtimeUnitSeen {
t.Errorf("no package name for runtime unit")
}
}
func TestMachoIssue32233(t *testing.T) {
testenv.MustHaveGoBuild(t)
testenv.MustHaveCGO(t)
if runtime.GOOS != "darwin" {
t.Skip("skipping; test only interesting on darwin")
}
tmpdir := t.TempDir()
wd, err := os.Getwd()
if err != nil {
t.Fatalf("where am I? %v", err)
}
pdir := filepath.Join(wd, "testdata", "issue32233", "main")
f := gobuildTestdata(t, tmpdir, pdir, DefaultOpt)
f.Close()
}
func TestWindowsIssue36495(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS != "windows" {
t.Skip("skipping: test only on windows")
}
dir := t.TempDir()
prog := `
package main
import "fmt"
func main() {
fmt.Println("Hello World")
}`
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
exe, err := pe.Open(f.path)
if err != nil {
t.Fatalf("error opening pe file: %v", err)
}
defer exe.Close()
dw, err := exe.DWARF()
if err != nil {
t.Fatalf("error parsing DWARF: %v", err)
}
rdr := dw.Reader()
for {
e, err := rdr.Next()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
if e == nil {
break
}
if e.Tag != dwarf.TagCompileUnit {
continue
}
lnrdr, err := dw.LineReader(e)
if err != nil {
t.Fatalf("error creating DWARF line reader: %v", err)
}
if lnrdr != nil {
var lne dwarf.LineEntry
for {
err := lnrdr.Next(&lne)
if err == io.EOF {
break
}
if err != nil {
t.Fatalf("error reading next DWARF line: %v", err)
}
if strings.Contains(lne.File.Name, `\`) {
t.Errorf("filename should not contain backslash: %v", lne.File.Name)
}
}
}
rdr.SkipChildren()
}
}
func TestIssue38192(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
// Build a test program that contains a translation unit whose
// text (from am assembly source) contains only a single instruction.
tmpdir := t.TempDir()
wd, err := os.Getwd()
if err != nil {
t.Fatalf("where am I? %v", err)
}
pdir := filepath.Join(wd, "testdata", "issue38192")
f := gobuildTestdata(t, tmpdir, pdir, DefaultOpt)
defer f.Close()
// Open the resulting binary and examine the DWARF it contains.
// Look for the function of interest ("main.singleInstruction")
// and verify that the line table has an entry not just for the
// single instruction but also a dummy instruction following it,
// so as to test that whoever is emitting the DWARF doesn't
// emit an end-sequence op immediately after the last instruction
// in the translation unit.
//
// NB: another way to write this test would have been to run the
// resulting executable under GDB, set a breakpoint in
// "main.singleInstruction", then verify that GDB displays the
// correct line/file information. Given the headache and flakiness
// associated with GDB-based tests these days, a direct read of
// the line table seems more desirable.
rows := []dwarf.LineEntry{}
dw, err := f.DWARF()
if err != nil {
t.Fatalf("error parsing DWARF: %v", err)
}
rdr := dw.Reader()
for {
e, err := rdr.Next()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
if e == nil {
break
}
if e.Tag != dwarf.TagCompileUnit {
continue
}
// NB: there can be multiple compile units named "main".
name := e.Val(dwarf.AttrName).(string)
if name != "main" {
continue
}
lnrdr, err := dw.LineReader(e)
if err != nil {
t.Fatalf("error creating DWARF line reader: %v", err)
}
if lnrdr != nil {
var lne dwarf.LineEntry
for {
err := lnrdr.Next(&lne)
if err == io.EOF {
break
}
if err != nil {
t.Fatalf("error reading next DWARF line: %v", err)
}
if !strings.HasSuffix(lne.File.Name, "ld/testdata/issue38192/oneline.s") {
continue
}
rows = append(rows, lne)
}
}
rdr.SkipChildren()
}
f.Close()
// Make sure that:
// - main.singleInstruction appears in the line table
// - more than one PC value appears the line table for
// that compilation unit.
// - at least one row has the correct line number (8)
pcs := make(map[uint64]bool)
line8seen := false
for _, r := range rows {
pcs[r.Address] = true
if r.Line == 8 {
line8seen = true
}
}
failed := false
if len(pcs) < 2 {
failed = true
t.Errorf("not enough line table rows for main.singleInstruction (got %d, wanted > 1", len(pcs))
}
if !line8seen {
failed = true
t.Errorf("line table does not contain correct line for main.singleInstruction")
}
if !failed {
return
}
for i, r := range rows {
t.Logf("row %d: A=%x F=%s L=%d\n", i, r.Address, r.File.Name, r.Line)
}
}
func TestIssue39757(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
// In this bug the DWARF line table contents for the last couple of
// instructions in a function were incorrect (bad file/line). This
// test verifies that all of the line table rows for a function
// of interest have the same file (no "autogenerated").
//
// Note: the function in this test was written with an eye towards
// ensuring that there are no inlined routines from other packages
// (which could introduce other source files into the DWARF); it's
// possible that at some point things could evolve in the
// compiler/runtime in ways that aren't happening now, so this
// might be something to check for if it does start failing.
tmpdir := t.TempDir()
wd, err := os.Getwd()
if err != nil {
t.Fatalf("where am I? %v", err)
}
pdir := filepath.Join(wd, "testdata", "issue39757")
f := gobuildTestdata(t, tmpdir, pdir, DefaultOpt)
defer f.Close()
syms, err := f.Symbols()
if err != nil {
t.Fatal(err)
}
var addr uint64
for _, sym := range syms {
if sym.Name == "main.main" {
addr = sym.Addr
break
}
}
if addr == 0 {
t.Fatal("cannot find main.main in symbols")
}
// Open the resulting binary and examine the DWARF it contains.
// Look for the function of interest ("main.main")
// and verify that all line table entries show the same source
// file.
dw, err := f.DWARF()
if err != nil {
t.Fatalf("error parsing DWARF: %v", err)
}
rdr := dw.Reader()
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
// Locate the main.main DIE
mains := ex.Named("main.main")
if len(mains) == 0 {
t.Fatalf("unable to locate DIE for main.main")
}
if len(mains) != 1 {
t.Fatalf("more than one main.main DIE")
}
maindie := mains[0]
// Collect the start/end PC for main.main
lowpc := maindie.Val(dwarf.AttrLowpc).(uint64)
highpc := maindie.Val(dwarf.AttrHighpc).(uint64)
// Now read the line table for the 'main' compilation unit.
mainIdx := ex.IdxFromOffset(maindie.Offset)
cuentry := ex.Parent(mainIdx)
if cuentry == nil {
t.Fatalf("main.main DIE appears orphaned")
}
lnrdr, lerr := dw.LineReader(cuentry)
if lerr != nil {
t.Fatalf("error creating DWARF line reader: %v", err)
}
if lnrdr == nil {
t.Fatalf("no line table for main.main compilation unit")
}
rows := []dwarf.LineEntry{}
mainrows := 0
var lne dwarf.LineEntry
for {
err := lnrdr.Next(&lne)
if err == io.EOF {
break
}
rows = append(rows, lne)
if err != nil {
t.Fatalf("error reading next DWARF line: %v", err)
}
if lne.Address < lowpc || lne.Address > highpc {
continue
}
if !strings.HasSuffix(lne.File.Name, "issue39757main.go") {
t.Errorf("found row with file=%s (not issue39757main.go)", lne.File.Name)
}
mainrows++
}
f.Close()
// Make sure we saw a few rows.
if mainrows < 3 {
t.Errorf("not enough line table rows for main.main (got %d, wanted > 3", mainrows)
for i, r := range rows {
t.Logf("row %d: A=%x F=%s L=%d\n", i, r.Address, r.File.Name, r.Line)
}
}
}
func TestIssue42484(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
tmpdir, err := ioutil.TempDir("", "TestIssue42484")
if err != nil {
t.Fatalf("could not create directory: %v", err)
}
defer os.RemoveAll(tmpdir)
wd, err := os.Getwd()
if err != nil {
t.Fatalf("where am I? %v", err)
}
pdir := filepath.Join(wd, "testdata", "issue42484")
f := gobuildTestdata(t, tmpdir, pdir, NoOpt)
var lastAddr uint64
var lastFile string
var lastLine int
dw, err := f.DWARF()
if err != nil {
t.Fatalf("error parsing DWARF: %v", err)
}
rdr := dw.Reader()
for {
e, err := rdr.Next()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
if e == nil {
break
}
if e.Tag != dwarf.TagCompileUnit {
continue
}
lnrdr, err := dw.LineReader(e)
if err != nil {
t.Fatalf("error creating DWARF line reader: %v", err)
}
if lnrdr != nil {
var lne dwarf.LineEntry
for {
err := lnrdr.Next(&lne)
if err == io.EOF {
break
}
if err != nil {
t.Fatalf("error reading next DWARF line: %v", err)
}
if lne.EndSequence {
continue
}
if lne.Address == lastAddr && (lne.File.Name != lastFile || lne.Line != lastLine) {
t.Errorf("address %#x is assigned to both %s:%d and %s:%d", lastAddr, lastFile, lastLine, lne.File.Name, lne.Line)
}
lastAddr = lne.Address
lastFile = lne.File.Name
lastLine = lne.Line
}
}
rdr.SkipChildren()
}
f.Close()
}
// processParams examines the formal parameter children of subprogram
// DIE "die" using the explorer "ex" and returns a string that
// captures the name, order, and classification of the subprogram's
// input and output parameters. For example, for the go function
//
// func foo(i1 int, f1 float64) (string, bool) {
//
// this function would return a string something like
//
// i1:0:1 f1:1:1 ~r0:2:2 ~r1:3:2
//
// where each chunk above is of the form NAME:ORDER:INOUTCLASSIFICATION
func processParams(die *dwarf.Entry, ex *dwtest.Examiner) string {
// Values in the returned map are of the form <order>:<varparam>
// where order is the order within the child DIE list of the
// param, and <varparam> is an integer:
//
// -1: varparm attr not found
// 1: varparm found with value false
// 2: varparm found with value true
//
foundParams := make(map[string]string)
// Walk the subprogram DIE's children looking for params.
pIdx := ex.IdxFromOffset(die.Offset)
childDies := ex.Children(pIdx)
idx := 0
for _, child := range childDies {
if child.Tag == dwarf.TagFormalParameter {
// NB: a setting of DW_AT_variable_parameter indicates
// that the param in question is an output parameter; we
// want to see this attribute set to TRUE for all Go
// return params. It would be OK to have it missing for
// input parameters, but for the moment we verify that the
// attr is present but set to false.
st := -1
if vp, ok := child.Val(dwarf.AttrVarParam).(bool); ok {
if vp {
st = 2
} else {
st = 1
}
}
if name, ok := child.Val(dwarf.AttrName).(string); ok {
foundParams[name] = fmt.Sprintf("%d:%d", idx, st)
idx++
}
}
}
found := make([]string, 0, len(foundParams))
for k, v := range foundParams {
found = append(found, fmt.Sprintf("%s:%s", k, v))
}
sort.Strings(found)
return fmt.Sprintf("%+v", found)
}
func TestOutputParamAbbrevAndAttr(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
// This test verifies that the compiler is selecting the correct
// DWARF abbreviation for output parameters, and that the
// variable parameter attribute is correct for in-params and
// out-params.
const prog = `
package main
//go:noinline
func ABC(c1, c2, c3 int, d1, d2, d3, d4 string, f1, f2, f3 float32, g1 [1024]int) (r1 int, r2 int, r3 [1024]int, r4 byte, r5 string, r6 float32) {
g1[0] = 6
r1, r2, r3, r4, r5, r6 = c3, c2+c1, g1, 'a', d1+d2+d3+d4, f1+f2+f3
return
}
func main() {
a := [1024]int{}
v1, v2, v3, v4, v5, v6 := ABC(1, 2, 3, "a", "b", "c", "d", 1.0, 2.0, 1.0, a)
println(v1, v2, v3[0], v4, v5, v6)
}
`
dir := t.TempDir()
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
// Locate the main.ABC DIE
abcs := ex.Named("main.ABC")
if len(abcs) == 0 {
t.Fatalf("unable to locate DIE for main.ABC")
}
if len(abcs) != 1 {
t.Fatalf("more than one main.ABC DIE")
}
abcdie := abcs[0]
// Vet the DIE
if abcdie.Tag != dwarf.TagSubprogram {
t.Fatalf("unexpected tag %v on main.ABC DIE", abcdie.Tag)
}
// Call a helper to collect param info.
found := processParams(abcdie, &ex)
// Make sure we see all of the expected params in the proper
// order, that they have the varparam attr, and the varparam is
// set for the returns.
expected := "[c1:0:1 c2:1:1 c3:2:1 d1:3:1 d2:4:1 d3:5:1 d4:6:1 f1:7:1 f2:8:1 f3:9:1 g1:10:1 r1:11:2 r2:12:2 r3:13:2 r4:14:2 r5:15:2 r6:16:2]"
if found != expected {
t.Errorf("param check failed, wanted:\n%s\ngot:\n%s\n",
expected, found)
}
}
func TestDictIndex(t *testing.T) {
// Check that variables with a parametric type have a dictionary index
// attribute and that types that are only referenced through dictionaries
// have DIEs.
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
if buildcfg.Experiment.Unified {
t.Skip("GOEXPERIMENT=unified does not emit dictionaries yet")
}
t.Parallel()
const prog = `
package main
import "fmt"
type CustomInt int
func testfn[T any](arg T) {
var mapvar = make(map[int]T)
mapvar[0] = arg
fmt.Println(arg, mapvar)
}
func main() {
testfn(CustomInt(3))
}
`
dir := t.TempDir()
f := gobuild(t, dir, prog, NoOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
found := false
for entry, err := rdr.Next(); entry != nil; entry, err = rdr.Next() {
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
name, _ := entry.Val(dwarf.AttrName).(string)
if strings.HasPrefix(name, "main.testfn") {
found = true
break
}
}
if !found {
t.Fatalf("could not find main.testfn")
}
offs := []dwarf.Offset{}
for entry, err := rdr.Next(); entry != nil; entry, err = rdr.Next() {
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
if entry.Tag == 0 {
break
}
name, _ := entry.Val(dwarf.AttrName).(string)
switch name {
case "arg", "mapvar":
offs = append(offs, entry.Val(dwarf.AttrType).(dwarf.Offset))
}
}
if len(offs) != 2 {
t.Errorf("wrong number of variables found in main.testfn %d", len(offs))
}
for _, off := range offs {
rdr.Seek(off)
entry, err := rdr.Next()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
if _, ok := entry.Val(intdwarf.DW_AT_go_dict_index).(int64); !ok {
t.Errorf("could not find DW_AT_go_dict_index attribute offset %#x (%T)", off, entry.Val(intdwarf.DW_AT_go_dict_index))
}
}
rdr.Seek(0)
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
for _, typeName := range []string{"main.CustomInt", "map[int]main.CustomInt"} {
dies := ex.Named(typeName)
if len(dies) != 1 {
t.Errorf("wanted 1 DIE named %s, found %v", typeName, len(dies))
}
if dies[0].Val(intdwarf.DW_AT_go_runtime_type).(uint64) == 0 {
t.Errorf("type %s does not have DW_AT_go_runtime_type", typeName)
}
}
}
func TestOptimizedOutParamHandling(t *testing.T) {
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
t.Parallel()
// This test is intended to verify that the compiler emits DWARF
// DIE entries for all input and output parameters, and that:
//
// - attributes are set correctly for output params,
// - things appear in the proper order
// - things work properly for both register-resident
// params and params passed on the stack
// - things work for both referenced and unreferenced params
// - things work for named return values un-named return vals
//
// The scenarios below don't cover all possible permutations and
// combinations, but they hit a bunch of the high points.
const prog = `
package main
// First testcase. All input params in registers, all params used.
//go:noinline
func tc1(p1, p2 int, p3 string) (int, string) {
return p1 + p2, p3 + "foo"
}
// Second testcase. Some params in registers, some on stack.
//go:noinline
func tc2(p1 int, p2 [128]int, p3 string) (int, string, [128]int) {
return p1 + p2[p1], p3 + "foo", [128]int{p1}
}
// Third testcase. Named return params.
//go:noinline
func tc3(p1 int, p2 [128]int, p3 string) (r1 int, r2 bool, r3 string, r4 [128]int) {
if p1 == 101 {
r1 = p1 + p2[p1]
r2 = p3 == "foo"
r4 = [128]int{p1}
return
} else {
return p1 - p2[p1+3], false, "bar", [128]int{p1 + 2}
}
}
// Fourth testcase. Some thing are used, some are unused.
//go:noinline
func tc4(p1, p1un int, p2, p2un [128]int, p3, p3un string) (r1 int, r1un int, r2 bool, r3 string, r4, r4un [128]int) {
if p1 == 101 {
r1 = p1 + p2[p2[0]]
r2 = p3 == "foo"
r4 = [128]int{p1}
return
} else {
return p1, -1, true, "plex", [128]int{p1 + 2}, [128]int{-1}
}
}
func main() {
{
r1, r2 := tc1(3, 4, "five")
println(r1, r2)
}
{
x := [128]int{9}
r1, r2, r3 := tc2(3, x, "five")
println(r1, r2, r3[0])
}
{
x := [128]int{9}
r1, r2, r3, r4 := tc3(3, x, "five")
println(r1, r2, r3, r4[0])
}
{
x := [128]int{3}
y := [128]int{7}
r1, r1u, r2, r3, r4, r4u := tc4(0, 1, x, y, "a", "b")
println(r1, r1u, r2, r3, r4[0], r4u[1])
}
}
`
dir := t.TempDir()
f := gobuild(t, dir, prog, DefaultOpt)
defer f.Close()
d, err := f.DWARF()
if err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
rdr := d.Reader()
ex := dwtest.Examiner{}
if err := ex.Populate(rdr); err != nil {
t.Fatalf("error reading DWARF: %v", err)
}
testcases := []struct {
tag string
expected string
}{
{
tag: "tc1",
expected: "[p1:0:1 p2:1:1 p3:2:1 ~r0:3:2 ~r1:4:2]",
},
{
tag: "tc2",
expected: "[p1:0:1 p2:1:1 p3:2:1 ~r0:3:2 ~r1:4:2 ~r2:5:2]",
},
{
tag: "tc3",
expected: "[p1:0:1 p2:1:1 p3:2:1 r1:3:2 r2:4:2 r3:5:2 r4:6:2]",
},
{
tag: "tc4",
expected: "[p1:0:1 p1un:1:1 p2:2:1 p2un:3:1 p3:4:1 p3un:5:1 r1:6:2 r1un:7:2 r2:8:2 r3:9:2 r4:10:2 r4un:11:2]",
},
}
for _, tc := range testcases {
// Locate the proper DIE
which := fmt.Sprintf("main.%s", tc.tag)
tcs := ex.Named(which)
if len(tcs) == 0 {
t.Fatalf("unable to locate DIE for " + which)
}
if len(tcs) != 1 {
t.Fatalf("more than one " + which + " DIE")
}
die := tcs[0]
// Vet the DIE
if die.Tag != dwarf.TagSubprogram {
t.Fatalf("unexpected tag %v on "+which+" DIE", die.Tag)
}
// Examine params for this subprogram.
foundParams := processParams(die, &ex)
if foundParams != tc.expected {
t.Errorf("check failed for testcase %s -- wanted:\n%s\ngot:%s\n",
tc.tag, tc.expected, foundParams)
}
}
}
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