b9846c7684
This patch aims to improve how Delve tracks the current goroutine, especially in very highly parallel programs. The main spirit of this patch is to ensure that even in situations where the goroutine we care about is not executing (common for len(g) > len(m)) we still end up back on that goroutine as a result of executing the 'next' command. We accomplish this by tracking our original goroutine id, and any time a breakpoint is hit or a threads stops, we examine the stopped threads and see if any are executing the goroutine we care about. If not, we set 'next' breakpoint for them again and continue them. This is done so that one of those threads can eventually pick up the goroutine we care about and begin executing it again.
96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
package proc
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import (
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"fmt"
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sys "golang.org/x/sys/unix"
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)
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// Not actually used, but necessary
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// to be defined.
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type OSSpecificDetails struct {
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registers sys.PtraceRegs
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}
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func (t *Thread) Halt() (err error) {
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defer func() {
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if err == nil {
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t.running = false
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}
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}()
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if t.Stopped() {
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return
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}
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err = sys.Tgkill(t.dbp.Pid, t.Id, sys.SIGSTOP)
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if err != nil {
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err = fmt.Errorf("halt err %s on thread %d", err, t.Id)
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return
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}
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_, _, err = wait(t.Id, t.dbp.Pid, 0)
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if err != nil {
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err = fmt.Errorf("wait err %s on thread %d", err, t.Id)
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return
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}
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return
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}
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func (thread *Thread) stopped() bool {
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state := status(thread.Id)
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return state == STATUS_TRACE_STOP
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}
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func (t *Thread) resume() (err error) {
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t.running = true
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t.dbp.execPtraceFunc(func() { err = PtraceCont(t.Id, 0) })
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return
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}
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func (t *Thread) singleStep() (err error) {
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t.dbp.execPtraceFunc(func() { err = sys.PtraceSingleStep(t.Id) })
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if err != nil {
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return err
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}
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_, _, err = wait(t.Id, t.dbp.Pid, 0)
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return err
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}
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func (t *Thread) blocked() bool {
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pc, _ := t.PC()
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fn := t.dbp.goSymTable.PCToFunc(pc)
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if fn != nil && ((fn.Name == "runtime.futex") || (fn.Name == "runtime.usleep") || (fn.Name == "runtime.clone")) {
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return true
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}
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return false
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}
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func (thread *Thread) saveRegisters() (Registers, error) {
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var err error
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(thread.Id, &thread.os.registers) })
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if err != nil {
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return nil, fmt.Errorf("could not save register contents")
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}
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return &Regs{&thread.os.registers}, nil
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}
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func (thread *Thread) restoreRegisters() (err error) {
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.Id, &thread.os.registers) })
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return
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}
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func (thread *Thread) writeMemory(addr uintptr, data []byte) (written int, err error) {
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if len(data) == 0 {
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return
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}
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thread.dbp.execPtraceFunc(func() { written, err = sys.PtracePokeData(thread.Id, addr, data) })
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return
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}
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func (thread *Thread) readMemory(addr uintptr, size int) (data []byte, err error) {
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if size == 0 {
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return
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}
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data = make([]byte, size)
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thread.dbp.execPtraceFunc(func() { _, err = sys.PtracePeekData(thread.Id, addr, data) })
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return
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}
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