// Set a breakpoint at every reachable location, as well as the return address. Without
// the benefit of an AST we can't be sure we're not at a branching statement and thus
// cannot accurately predict where we may end up.
func (thread *Thread) cnext(curpc uint64, fde *frame.FrameDescriptionEntry) error {
pcs := thread.dbp.lineInfo.AllPCsBetween(fde.Begin(), fde.End())
ret, err := thread.ReturnAddress()
if err != nil {
return err
}
pcs = append(pcs, ret)
return thread.setNextTempBreakpoints(curpc, pcs)
}
// Use the AST to determine potential next lines.
func (thread *Thread) next(curpc uint64, fde *frame.FrameDescriptionEntry, file string, line int) error {
lines, err := thread.dbp.ast.NextLines(file, line)
if err != nil {
if _, ok := err.(source.NoNodeError); !ok {
return err
}
}
ret, err := thread.ReturnAddress()
if err != nil {
return err
}
pcs := make([]uint64, 0, len(lines))
for i := range lines {
pcs = append(pcs, thread.dbp.lineInfo.AllPCsForFileLine(file, lines[i])...)
}
var covered bool
for i := range pcs {
if fde.Cover(pcs[i]) {
covered = true
break
}
}
if !covered {
fn := thread.dbp.goSymTable.PCToFunc(ret)
if fn != nil && fn.Name == "runtime.goexit" {
g, err := thread.getG()
if err != nil {
return err
}
return GoroutineExitingError{goid: g.Id}
}
}
pcs = append(pcs, ret)
return thread.setNextTempBreakpoints(curpc, pcs)
}
// Set breakpoints at every line, and the return address. Also look for
// a deferred function and set a breakpoint there too.
func (thread *Thread) next(curpc uint64, fde *frame.FrameDescriptionEntry, file string, line int) error {
pcs := thread.dbp.lineInfo.AllPCsBetween(fde.Begin(), fde.End(), file)
g, err := thread.GetG()
if err != nil {
return err
}
if g.DeferPC != 0 {
f, lineno, _ := thread.dbp.goSymTable.PCToLine(g.DeferPC)
for {
lineno++
dpc, _, err := thread.dbp.goSymTable.LineToPC(f, lineno)
if err == nil {
// We want to avoid setting an actual breakpoint on the
// entry point of the deferred function so instead create
// a fake breakpoint which will be cleaned up later.
thread.dbp.Breakpoints[g.DeferPC] = new(Breakpoint)
defer func() { delete(thread.dbp.Breakpoints, g.DeferPC) }()
if _, err = thread.dbp.SetTempBreakpoint(dpc); err != nil {
return err
}
break
}
}
}
ret, err := thread.ReturnAddress()
if err != nil {
return err
}
var covered bool
for i := range pcs {
if fde.Cover(pcs[i]) {
covered = true
break
}
}
if !covered {
fn := thread.dbp.goSymTable.PCToFunc(ret)
if fn != nil && fn.Name == "runtime.goexit" {
g, err := thread.GetG()
if err != nil {
return err
}
return GoroutineExitingError{goid: g.Id}
}
}
pcs = append(pcs, ret)
return thread.setNextTempBreakpoints(curpc, pcs)
}