Update vendor folder (Delve support)

vendor/github.com/derekparker/delve/pkg/dwarf/frame/entries.go

@@ -0,0 +1,95 @@
+package frame
+
+import (
+	"encoding/binary"
+	"fmt"
+	"sort"
+)
+
+// Represents a Common Information Entry in
+// the Dwarf .debug_frame section.
+type CommonInformationEntry struct {
+	Length                uint32
+	CIE_id                uint32
+	Version               uint8
+	Augmentation          string
+	CodeAlignmentFactor   uint64
+	DataAlignmentFactor   int64
+	ReturnAddressRegister uint64
+	InitialInstructions   []byte
+}
+
+// Represents a Frame Descriptor Entry in the
+// Dwarf .debug_frame section.
+type FrameDescriptionEntry struct {
+	Length       uint32
+	CIE          *CommonInformationEntry
+	Instructions []byte
+	begin, end   uint64
+	order        binary.ByteOrder
+}
+
+// Returns whether or not the given address is within the
+// bounds of this frame.
+func (fde *FrameDescriptionEntry) Cover(addr uint64) bool {
+	if (addr - fde.begin) < fde.end {
+		return true
+	}
+	return false
+}
+
+// Address of first location for this frame.
+func (fde *FrameDescriptionEntry) Begin() uint64 {
+	return fde.begin
+}
+
+// Address of last location for this frame.
+func (fde *FrameDescriptionEntry) End() uint64 {
+	return fde.begin + fde.end
+}
+
+// Set up frame for the given PC.
+func (fde *FrameDescriptionEntry) EstablishFrame(pc uint64) *FrameContext {
+	return executeDwarfProgramUntilPC(fde, pc)
+}
+
+// Return the offset from the current SP that the return address is stored at.
+func (fde *FrameDescriptionEntry) ReturnAddressOffset(pc uint64) (frameOffset, returnAddressOffset int64) {
+	frame := fde.EstablishFrame(pc)
+	return frame.cfa.offset, frame.regs[fde.CIE.ReturnAddressRegister].offset
+}
+
+type FrameDescriptionEntries []*FrameDescriptionEntry
+
+func NewFrameIndex() FrameDescriptionEntries {
+	return make(FrameDescriptionEntries, 0, 1000)
+}
+
+type NoFDEForPCError struct {
+	PC uint64
+}
+
+func (err *NoFDEForPCError) Error() string {
+	return fmt.Sprintf("could not find FDE for PC %#v", err.PC)
+}
+
+// Returns the Frame Description Entry for the given PC.
+func (fdes FrameDescriptionEntries) FDEForPC(pc uint64) (*FrameDescriptionEntry, error) {
+	idx := sort.Search(len(fdes), func(i int) bool {
+		if fdes[i].Cover(pc) {
+			return true
+		}
+		if fdes[i].LessThan(pc) {
+			return false
+		}
+		return true
+	})
+	if idx == len(fdes) {
+		return nil, &NoFDEForPCError{pc}
+	}
+	return fdes[idx], nil
+}
+
+func (frame *FrameDescriptionEntry) LessThan(pc uint64) bool {
+	return frame.End() <= pc
+}