a788e03c7b
This current implementation does not cover the following:
* Setting correct breakpoint when exiting loop
* Setting correct breakpoint when returning from function
* All facilities are available for this, it just is not taken into
account in the current `next` implementation.
99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
package line
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import (
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"bytes"
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"encoding/binary"
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"github.com/derekparker/dbg/dwarf/util"
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)
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type DebugLinePrologue struct {
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Length uint32
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Version uint16
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PrologueLength uint32
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MinInstrLength uint8
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InitialIsStmt uint8
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LineBase int8
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LineRange uint8
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OpcodeBase uint8
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StdOpLengths []uint8
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}
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type DebugLineInfo struct {
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Prologue *DebugLinePrologue
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IncludeDirs []string
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FileNames []*FileEntry
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Instructions []byte
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}
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type FileEntry struct {
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Name string
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DirIdx uint64
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LastModTime uint64
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Length uint64
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}
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func Parse(data []byte) *DebugLineInfo {
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var (
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dbl = &DebugLineInfo{}
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buf = bytes.NewBuffer(data)
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)
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parseDebugLinePrologue(dbl, buf)
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parseIncludeDirs(dbl, buf)
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parseFileEntries(dbl, buf)
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dbl.Instructions = buf.Bytes()
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return dbl
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}
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func parseDebugLinePrologue(dbl *DebugLineInfo, buf *bytes.Buffer) {
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p := &DebugLinePrologue{}
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binary.Read(buf, binary.LittleEndian, &p.Length)
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binary.Read(buf, binary.LittleEndian, &p.Version)
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binary.Read(buf, binary.LittleEndian, &p.PrologueLength)
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binary.Read(buf, binary.LittleEndian, &p.MinInstrLength)
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binary.Read(buf, binary.LittleEndian, &p.InitialIsStmt)
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binary.Read(buf, binary.LittleEndian, &p.LineBase)
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binary.Read(buf, binary.LittleEndian, &p.LineRange)
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binary.Read(buf, binary.LittleEndian, &p.OpcodeBase)
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binary.Read(buf, binary.LittleEndian, &p.StdOpLengths)
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p.StdOpLengths = make([]uint8, p.OpcodeBase-1)
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for i := uint8(0); i < p.OpcodeBase-1; i++ {
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binary.Read(buf, binary.LittleEndian, &p.StdOpLengths[i])
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}
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dbl.Prologue = p
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}
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func parseIncludeDirs(info *DebugLineInfo, buf *bytes.Buffer) {
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for {
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str, _ := util.ParseString(buf)
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if str == "" {
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break
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}
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info.IncludeDirs = append(info.IncludeDirs, str)
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}
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}
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func parseFileEntries(info *DebugLineInfo, buf *bytes.Buffer) {
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for {
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entry := FileEntry{}
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name, _ := util.ParseString(buf)
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if name == "" {
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break
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}
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entry.Name = name
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entry.DirIdx, _ = util.DecodeULEB128(buf)
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entry.LastModTime, _ = util.DecodeULEB128(buf)
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entry.Length, _ = util.DecodeULEB128(buf)
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info.FileNames = append(info.FileNames, &entry)
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}
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}
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