func defcfa(frame *FrameContext) {
reg, _ := util.DecodeULEB128(frame.buf)
offset, _ := util.DecodeULEB128(frame.buf)
frame.cfa.register = reg
frame.cfa.offset = int64(offset)
}
func parseCIE(ctx *parseContext) parsefunc {
data := ctx.buf.Next(int(ctx.length))
buf := bytes.NewBuffer(data)
// parse version
ctx.common.Version = data[0]
// parse augmentation
ctx.common.Augmentation, _ = util.ParseString(buf)
// parse code alignment factor
ctx.common.CodeAlignmentFactor, _ = util.DecodeULEB128(buf)
// parse data alignment factor
ctx.common.DataAlignmentFactor, _ = util.DecodeSLEB128(buf)
// parse return address register
ctx.common.ReturnAddressRegister, _ = util.DecodeULEB128(buf)
// parse initial instructions
// The rest of this entry consists of the instructions
// so we can just grab all of the data from the buffer
// cursor to length.
ctx.common.InitialInstructions = buf.Bytes() //ctx.buf.Next(int(ctx.length))
ctx.length = 0
return parselength
}
func valoffset(frame *FrameContext) {
var (
reg, _ = util.DecodeULEB128(frame.buf)
offset, _ = util.DecodeULEB128(frame.buf)
)
frame.regs[reg] = DWRule{offset: int64(offset), rule: rule_valoffset}
}
func offsetextended(frame *FrameContext) {
var (
reg, _ = util.DecodeULEB128(frame.buf)
offset, _ = util.DecodeULEB128(frame.buf)
)
frame.regs[reg] = DWRule{offset: int64(offset) * frame.dataAlignment, rule: rule_offset}
}
func valexpression(frame *FrameContext) {
var (
reg, _ = util.DecodeULEB128(frame.buf)
l, _ = util.DecodeULEB128(frame.buf)
expr = frame.buf.Next(int(l))
)
frame.regs[reg] = DWRule{rule: rule_valexpression, expression: expr}
}
func definefile(sm *StateMachine, buf *bytes.Buffer) {
var (
_, _ = util.ParseString(buf)
_, _ = util.DecodeULEB128(buf)
_, _ = util.DecodeULEB128(buf)
_, _ = util.DecodeULEB128(buf)
)
// Don't do anything here yet.
}
func defcfasf(frame *FrameContext) {
reg, _ := util.DecodeULEB128(frame.buf)
offset, _ := util.DecodeSLEB128(frame.buf)
frame.cfa.register = reg
frame.cfa.offset = offset * frame.dataAlignment
}
func valoffsetsf(frame *FrameContext) {
var (
reg, _ = util.DecodeULEB128(frame.buf)
offset, _ = util.DecodeSLEB128(frame.buf)
)
frame.regs[reg] = DWRule{offset: offset * frame.dataAlignment, rule: rule_valoffset}
}
func parseFileEntries(info *DebugLineInfo, buf *bytes.Buffer) {
for {
entry := new(FileEntry)
name, _ := util.ParseString(buf)
if name == "" {
break
}
entry.Name = name
entry.DirIdx, _ = util.DecodeULEB128(buf)
entry.LastModTime, _ = util.DecodeULEB128(buf)
entry.Length, _ = util.DecodeULEB128(buf)
info.FileNames = append(info.FileNames, entry)
}
}
func defcfaexpression(frame *FrameContext) {
var (
l, _ = util.DecodeULEB128(frame.buf)
expr = frame.buf.Next(int(l))
)
frame.cfa.expression = expr
frame.cfa.rule = rule_expression
}
func restoreextended(frame *FrameContext) {
reg, _ := util.DecodeULEB128(frame.buf)
oldrule, ok := frame.initialRegs[reg]
if ok {
frame.regs[reg] = DWRule{offset: oldrule.offset, rule: rule_offset}
} else {
frame.regs[reg] = DWRule{rule: rule_undefined}
}
}
func execExtendedOpcode(sm *StateMachine, instr byte, buf *bytes.Buffer) {
_, _ = util.DecodeULEB128(buf)
b, _ := buf.ReadByte()
fn, ok := extendedopcodes[b]
if !ok {
panic(fmt.Sprintf("Encountered unknown extended opcode %#v\n", b))
}
sm.lastWasStandard = false
fn(sm, buf)
}
func offset(frame *FrameContext) {
b, err := frame.buf.ReadByte()
if err != nil {
panic(err)
}
var (
reg = b & low_6_offset
offset, _ = util.DecodeULEB128(frame.buf)
)
frame.regs[uint64(reg)] = DWRule{offset: int64(offset) * frame.dataAlignment, rule: rule_offset}
}
func samevalue(frame *FrameContext) {
reg, _ := util.DecodeULEB128(frame.buf)
frame.regs[reg] = DWRule{rule: rule_sameval}
}
func advancepc(sm *StateMachine, buf *bytes.Buffer) {
addr, _ := util.DecodeULEB128(buf)
sm.address += addr * uint64(sm.dbl.Prologue.MinInstrLength)
}
func defcfaoffset(frame *FrameContext) {
offset, _ := util.DecodeULEB128(frame.buf)
frame.cfa.offset = int64(offset)
}
func defcfaregister(frame *FrameContext) {
reg, _ := util.DecodeULEB128(frame.buf)
frame.cfa.register = reg
}
func setfile(sm *StateMachine, buf *bytes.Buffer) {
i, _ := util.DecodeULEB128(buf)
sm.file = sm.dbl.FileNames[i-1].Name
}
func setcolumn(sm *StateMachine, buf *bytes.Buffer) {
c, _ := util.DecodeULEB128(buf)
sm.column = uint(c)
}
func undefined(frame *FrameContext) {
reg, _ := util.DecodeULEB128(frame.buf)
frame.regs[reg] = DWRule{rule: rule_undefined}
}
func plusuconsts(buf *bytes.Buffer, stack []int64, cfa int64) ([]int64, error) {
slen := len(stack)
num, _ := util.DecodeULEB128(buf)
stack[slen-1] = stack[slen-1] + int64(num)
return stack, nil
}
func register(frame *FrameContext) {
reg1, _ := util.DecodeULEB128(frame.buf)
reg2, _ := util.DecodeULEB128(frame.buf)
frame.regs[reg1] = DWRule{newreg: reg2, rule: rule_register}
}