f4e2000fc8
Instead of only tracking a few cherrypicked registers in stack.go track all DWARF registers. This is needed for cgo code and for the locationlists emitted by go in 1.10: * The debug_frame sections emitted by C compilers can not be used without tracking all registers * the loclists emitted by go1.10 need all registers of a frame to be interpreted.
96 lines
1.9 KiB
Go
96 lines
1.9 KiB
Go
package op
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import (
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"bytes"
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"encoding/binary"
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)
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type DwarfRegisters struct {
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CFA int64
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FrameBase int64
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ObjBase int64
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Regs []*DwarfRegister
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ByteOrder binary.ByteOrder
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PCRegNum uint64
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SPRegNum uint64
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}
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type DwarfRegister struct {
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Uint64Val uint64
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Bytes []byte
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}
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// Uint64Val returns the uint64 value of register idx.
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func (regs *DwarfRegisters) Uint64Val(idx uint64) uint64 {
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reg := regs.Reg(idx)
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if reg == nil {
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return 0
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}
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return regs.Regs[idx].Uint64Val
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}
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// Bytes returns the bytes value of register idx, nil if the register is not
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// defined.
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func (regs *DwarfRegisters) Bytes(idx uint64) []byte {
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reg := regs.Reg(idx)
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if reg == nil {
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return nil
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}
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if reg.Bytes == nil {
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var buf bytes.Buffer
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binary.Write(&buf, regs.ByteOrder, reg.Uint64Val)
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reg.Bytes = buf.Bytes()
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}
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return reg.Bytes
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}
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// Reg returns register idx or nil if the register is not defined.
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func (regs *DwarfRegisters) Reg(idx uint64) *DwarfRegister {
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if idx >= uint64(len(regs.Regs)) {
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return nil
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}
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return regs.Regs[idx]
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}
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func (regs *DwarfRegisters) PC() uint64 {
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return regs.Uint64Val(regs.PCRegNum)
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}
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func (regs *DwarfRegisters) SP() uint64 {
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return regs.Uint64Val(regs.SPRegNum)
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}
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// AddReg adds register idx to regs.
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func (regs *DwarfRegisters) AddReg(idx uint64, reg *DwarfRegister) {
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if idx >= uint64(len(regs.Regs)) {
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newRegs := make([]*DwarfRegister, idx+1)
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copy(newRegs, regs.Regs)
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regs.Regs = newRegs
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}
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regs.Regs[idx] = reg
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}
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func DwarfRegisterFromUint64(v uint64) *DwarfRegister {
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return &DwarfRegister{Uint64Val: v}
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}
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func DwarfRegisterFromBytes(bytes []byte) *DwarfRegister {
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var v uint64
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switch len(bytes) {
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case 1:
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v = uint64(bytes[0])
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case 2:
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x := binary.LittleEndian.Uint16(bytes)
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v = uint64(x)
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case 4:
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x := binary.LittleEndian.Uint32(bytes)
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v = uint64(x)
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default:
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if len(bytes) >= 8 {
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v = binary.LittleEndian.Uint64(bytes[:8])
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}
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}
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return &DwarfRegister{Uint64Val: v, Bytes: bytes}
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}
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