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.
115 lines
2.4 KiB
Go
115 lines
2.4 KiB
Go
package proc
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// #include "threads_darwin.h"
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import "C"
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import (
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"fmt"
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"unsafe"
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)
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type OSSpecificDetails struct {
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thread_act C.thread_act_t
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registers C.x86_thread_state64_t
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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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kret := C.thread_suspend(t.os.thread_act)
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if kret != C.KERN_SUCCESS {
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errStr := C.GoString(C.mach_error_string(C.mach_error_t(kret)))
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err = fmt.Errorf("could not suspend thread %d %s", t.Id, errStr)
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return
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}
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return
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}
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func (t *Thread) singleStep() error {
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kret := C.single_step(t.os.thread_act)
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if kret != C.KERN_SUCCESS {
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return fmt.Errorf("could not single step")
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}
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t.dbp.trapWait(0)
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kret = C.clear_trap_flag(t.os.thread_act)
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if kret != C.KERN_SUCCESS {
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return fmt.Errorf("could not clear CPU trap flag")
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}
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return nil
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}
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func (t *Thread) resume() error {
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t.running = true
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// TODO(dp) set flag for ptrace stops
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var err error
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t.dbp.execPtraceFunc(func() { err = PtraceCont(t.dbp.Pid, 0) })
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if err == nil {
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return nil
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}
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kret := C.resume_thread(t.os.thread_act)
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if kret != C.KERN_SUCCESS {
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return fmt.Errorf("could not continue thread")
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}
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return nil
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}
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func (thread *Thread) blocked() bool {
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// TODO(dp) cache the func pc to remove this lookup
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pc, err := thread.PC()
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if err != nil {
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return false
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}
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fn := thread.dbp.goSymTable.PCToFunc(pc)
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if fn == nil {
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return false
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}
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switch fn.Name {
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case "runtime.kevent", "runtime.mach_semaphore_wait", "runtime.usleep":
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return true
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default:
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return false
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}
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}
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func (thread *Thread) stopped() bool {
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return C.thread_blocked(thread.os.thread_act) > C.int(0)
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}
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func (thread *Thread) writeMemory(addr uintptr, data []byte) (int, error) {
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if len(data) == 0 {
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return 0, nil
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}
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var (
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vm_data = unsafe.Pointer(&data[0])
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vm_addr = C.mach_vm_address_t(addr)
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length = C.mach_msg_type_number_t(len(data))
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)
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if ret := C.write_memory(thread.dbp.os.task, vm_addr, vm_data, length); ret < 0 {
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return 0, fmt.Errorf("could not write memory")
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}
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return len(data), nil
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}
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func (thread *Thread) readMemory(addr uintptr, size int) ([]byte, error) {
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if size == 0 {
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return nil, nil
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}
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var (
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buf = make([]byte, size)
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vm_data = unsafe.Pointer(&buf[0])
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vm_addr = C.mach_vm_address_t(addr)
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length = C.mach_msg_type_number_t(size)
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)
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ret := C.read_memory(thread.dbp.os.task, vm_addr, vm_data, length)
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if ret < 0 {
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return nil, fmt.Errorf("could not read memory")
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}
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return buf, nil
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}
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