mirror of
https://github.com/go-delve/delve.git
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98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
package frame
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import (
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"fmt"
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"github.com/derekparker/rbtree"
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)
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// Represents a Common Information Entry in
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// the Dwarf .debug_frame section.
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type CommonInformationEntry struct {
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Length uint32
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CIE_id uint32
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Version uint8
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Augmentation string
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CodeAlignmentFactor uint64
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DataAlignmentFactor int64
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ReturnAddressRegister uint64
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InitialInstructions []byte
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}
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type addrange struct {
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begin, end uint64
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}
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func (r *addrange) Begin() uint64 {
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return r.begin
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}
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func (r *addrange) End() uint64 {
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return r.end
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}
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func (r *addrange) Cover(addr uint64) bool {
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if (addr - r.begin) < r.end {
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return true
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}
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return false
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}
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// Represents a Frame Descriptor Entry in the
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// Dwarf .debug_frame section.
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type FrameDescriptionEntry struct {
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Length uint32
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CIE *CommonInformationEntry
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AddressRange *addrange
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Instructions []byte
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}
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func (fde *FrameDescriptionEntry) EstablishFrame(pc uint64) *FrameContext {
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return executeDwarfProgramUntilPC(fde, pc)
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}
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func (fde *FrameDescriptionEntry) ReturnAddressOffset(pc uint64) int64 {
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frame := fde.EstablishFrame(pc)
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return frame.cfa.offset + frame.regs[fde.CIE.ReturnAddressRegister].offset
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}
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type FrameDescriptionEntries struct {
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*rbtree.RedBlackTree
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}
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func NewFrameIndex() *FrameDescriptionEntries {
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return &FrameDescriptionEntries{rbtree.New()}
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}
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func (fdes *FrameDescriptionEntries) FDEForPC(pc uint64) (*FrameDescriptionEntry, error) {
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node, ok := fdes.Find(Addr(pc))
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if !ok {
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return nil, fmt.Errorf("Could not find FDE for %#v", pc)
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}
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return node.(*FrameDescriptionEntry), nil
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}
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func (frame *FrameDescriptionEntry) Less(item rbtree.Item) bool {
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return frame.AddressRange.begin < item.(*FrameDescriptionEntry).AddressRange.begin
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}
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func (frame *FrameDescriptionEntry) More(item rbtree.Item) bool {
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r := item.(*FrameDescriptionEntry).AddressRange
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fnr := frame.AddressRange
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return fnr.begin+fnr.end > r.begin+r.end
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}
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type Addr uint64
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func (a Addr) Less(item rbtree.Item) bool {
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return uint64(a) < item.(*FrameDescriptionEntry).AddressRange.begin
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}
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func (a Addr) More(item rbtree.Item) bool {
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r := item.(*FrameDescriptionEntry).AddressRange
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return uint64(a) > r.begin+r.end
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}
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