refactor: move loadModuleData from runtimeTypeToDIE and expose the apis (#3741)

pkg/proc/bininfo.go

@@ -1028,7 +1028,7 @@ func (bi *BinaryInfo) AddImage(path string, addr uint64) error {
 }
 
 // moduleDataToImage finds the image corresponding to the given module data object.
-func (bi *BinaryInfo) moduleDataToImage(md *moduleData) *Image {
+func (bi *BinaryInfo) moduleDataToImage(md *ModuleData) *Image {
 	fn := bi.PCToFunc(md.text)
 	if fn != nil {
 		return bi.funcToImage(fn)
@@ -1047,7 +1047,7 @@ func (bi *BinaryInfo) moduleDataToImage(md *moduleData) *Image {
 }
 
 // imageToModuleData finds the module data in mds corresponding to the given image.
-func (bi *BinaryInfo) imageToModuleData(image *Image, mds []moduleData) *moduleData {
+func (bi *BinaryInfo) imageToModuleData(image *Image, mds []ModuleData) *ModuleData {
 	for _, md := range mds {
 		im2 := bi.moduleDataToImage(&md)
 		if im2 != nil && im2.index == image.index {

pkg/proc/moduledata.go

@@ -1,13 +1,13 @@
 package proc
 
-// delve counterpart to runtime.moduledata
+// ModuleData counterpart to runtime.moduleData
-type moduleData struct {
+type ModuleData struct {
 	text, etext   uint64
 	types, etypes uint64
 	typemapVar    *Variable
 }
 
-func loadModuleData(bi *BinaryInfo, mem MemoryReadWriter) ([]moduleData, error) {
+func LoadModuleData(bi *BinaryInfo, mem MemoryReadWriter) ([]ModuleData, error) {
 	// +rtype -var firstmoduledata moduledata
 	// +rtype -field moduledata.text uintptr
 	// +rtype -field moduledata.types uintptr
@@ -19,7 +19,7 @@ func loadModuleData(bi *BinaryInfo, mem MemoryReadWriter) ([]moduleData, error)
 		return nil, err
 	}
 
-	r := []moduleData{}
+	r := []ModuleData{}
 
 	for md.Addr != 0 {
 		const (
@@ -51,7 +51,7 @@ func loadModuleData(bi *BinaryInfo, mem MemoryReadWriter) ([]moduleData, error)
 			return ret
 		}
 
-		r = append(r, moduleData{
+		r = append(r, ModuleData{
 			types: touint(typesField), etypes: touint(etypesField),
 			text: touint(textField), etext: touint(etextField),
 			typemapVar: vars[typemapField],
@@ -69,7 +69,7 @@ func loadModuleData(bi *BinaryInfo, mem MemoryReadWriter) ([]moduleData, error)
 	return r, nil
 }
 
-func findModuleDataForType(bi *BinaryInfo, mds []moduleData, typeAddr uint64, mem MemoryReadWriter) *moduleData {
+func findModuleDataForType(bi *BinaryInfo, mds []ModuleData, typeAddr uint64, mem MemoryReadWriter) *ModuleData {
 	for i := range mds {
 		if typeAddr >= mds[i].types && typeAddr < mds[i].etypes {
 			return &mds[i]

pkg/proc/types.go

@@ -89,7 +89,7 @@ func (ctxt *loadDebugInfoMapsContext) lookupAbstractOrigin(bi *BinaryInfo, off d
 	return r
 }
 
-// runtimeTypeToDIE returns the DIE corresponding to the runtime._type.
+// RuntimeTypeToDIE returns the DIE corresponding to the runtime._type.
 // This is done in three different ways depending on the version of go.
 //   - Before go1.7 the type name is retrieved directly from the runtime._type
 //     and looked up in debug_info
@@ -98,18 +98,13 @@ func (ctxt *loadDebugInfoMapsContext) lookupAbstractOrigin(bi *BinaryInfo, off d
 //     debug_info
 //   - After go1.11 the runtimeTypeToDIE map is used to look up the address of
 //     the type and map it directly to a DIE.
-func runtimeTypeToDIE(_type *Variable, dataAddr uint64) (typ godwarf.Type, kind int64, err error) {
+func RuntimeTypeToDIE(_type *Variable, dataAddr uint64, mds []ModuleData) (typ godwarf.Type, kind int64, err error) {
 	bi := _type.bi
 
 	_type = _type.maybeDereference()
 
 	// go 1.11 implementation: use extended attribute in debug_info
 
-	mds, err := loadModuleData(bi, _type.mem)
-	if err != nil {
-		return nil, 0, fmt.Errorf("error loading module data: %v", err)
-	}
-
 	md := findModuleDataForType(bi, mds, _type.Addr, _type.mem)
 	if md != nil {
 		so := bi.moduleDataToImage(md)
@@ -154,7 +149,12 @@ func resolveParametricType(bi *BinaryInfo, mem MemoryReadWriter, t godwarf.Type,
 	}
 	_type := newVariable("", rtypeAddr, runtimeType, bi, mem)
 
-	typ, _, err := runtimeTypeToDIE(_type, 0)
+	mds, err := LoadModuleData(bi, _type.mem)
+	if err != nil {
+		return ptyp.TypedefType.Type, fmt.Errorf("error loading module data: %v", err)
+	}
+
+	typ, _, err := RuntimeTypeToDIE(_type, 0, mds)
 	if err != nil {
 		return ptyp.TypedefType.Type, err
 	}
@@ -175,7 +175,7 @@ func dwarfToRuntimeType(bi *BinaryInfo, mem MemoryReadWriter, typ godwarf.Type)
 		return 0, 0, false, nil
 	}
 
-	mds, err := loadModuleData(bi, mem)
+	mds, err := LoadModuleData(bi, mem)
 	if err != nil {
 		return 0, 0, false, err
 	}

pkg/proc/variables.go

@@ -2337,7 +2337,13 @@ func (v *Variable) loadInterface(recurseLevel int, loadData bool, cfg LoadConfig
 		return
 	}
 
-	typ, kind, err := runtimeTypeToDIE(_type, data.Addr)
+	mds, err := LoadModuleData(_type.bi, _type.mem)
+	if err != nil {
+		v.Unreadable = fmt.Errorf("error loading module data: %v", err)
+		return
+	}
+
+	typ, kind, err := RuntimeTypeToDIE(_type, data.Addr, mds)
 	if err != nil {
 		v.Unreadable = err
 		return