3566fd5237
Improvements: * `next`ing through a loop works correctly (when not already within a loop) * `next`ing out of a function works correctly Needs work: * `next`ing in a loop can be improved when starting within a loop
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package frame
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import "fmt"
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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 byte
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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) 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[16].offset
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}
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type FrameDescriptionEntries []*FrameDescriptionEntry
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func (fdes FrameDescriptionEntries) FDEForPC(pc uint64) (*FrameDescriptionEntry, error) {
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for _, fde := range fdes {
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if fde.AddressRange.Cover(pc) {
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return fde, nil
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}
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}
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return nil, fmt.Errorf("Could not find FDE for %#v", pc)
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}
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