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bee/vendor/github.com/derekparker/delve/proc/threads_windows.go
2017-03-26 16:55:28 +02:00

152 lines
3.2 KiB
Go

package proc
import (
"syscall"
sys "golang.org/x/sys/windows"
)
// WaitStatus is a synonym for the platform-specific WaitStatus
type WaitStatus sys.WaitStatus
// OSSpecificDetails holds information specific to the Windows
// operating system / kernel.
type OSSpecificDetails struct {
hThread syscall.Handle
}
func (t *Thread) halt() (err error) {
// Ignore the request to halt. On Windows, all threads are halted
// on return from WaitForDebugEvent.
return nil
// TODO - This may not be correct in all usages of dbp.Halt. There
// are some callers who use dbp.Halt() to stop the process when it is not
// already broken on a debug event.
}
func (t *Thread) singleStep() error {
context := newCONTEXT()
context.ContextFlags = _CONTEXT_ALL
// Set the processor TRAP flag
err := _GetThreadContext(t.os.hThread, context)
if err != nil {
return err
}
context.EFlags |= 0x100
err = _SetThreadContext(t.os.hThread, context)
if err != nil {
return err
}
_, err = _ResumeThread(t.os.hThread)
if err != nil {
return err
}
for {
var tid, exitCode int
t.dbp.execPtraceFunc(func() {
tid, exitCode, err = t.dbp.waitForDebugEvent(waitBlocking | waitSuspendNewThreads)
})
if err != nil {
return err
}
if tid == 0 {
t.dbp.postExit()
return ProcessExitedError{Pid: t.dbp.Pid, Status: exitCode}
}
if t.dbp.os.breakThread == t.ID {
break
}
t.dbp.execPtraceFunc(func() {
err = _ContinueDebugEvent(uint32(t.dbp.Pid), uint32(t.dbp.os.breakThread), _DBG_CONTINUE)
})
}
_, err = _SuspendThread(t.os.hThread)
if err != nil {
return err
}
t.dbp.execPtraceFunc(func() {
err = _ContinueDebugEvent(uint32(t.dbp.Pid), uint32(t.ID), _DBG_CONTINUE)
})
if err != nil {
return err
}
// Unset the processor TRAP flag
err = _GetThreadContext(t.os.hThread, context)
if err != nil {
return err
}
context.EFlags &= ^uint32(0x100)
return _SetThreadContext(t.os.hThread, context)
}
func (t *Thread) resume() error {
t.running = true
var err error
t.dbp.execPtraceFunc(func() {
//TODO: Note that we are ignoring the thread we were asked to continue and are continuing the
//thread that we last broke on.
err = _ContinueDebugEvent(uint32(t.dbp.Pid), uint32(t.ID), _DBG_CONTINUE)
})
return err
}
func (t *Thread) blocked() bool {
// TODO: Probably incorrect - what are the runtime functions that
// indicate blocking on Windows?
pc, err := t.PC()
if err != nil {
return false
}
fn := t.dbp.goSymTable.PCToFunc(pc)
if fn == nil {
return false
}
switch fn.Name {
case "runtime.kevent", "runtime.usleep":
return true
default:
return false
}
}
func (t *Thread) stopped() bool {
// TODO: We are assuming that threads are always stopped
// during command execution.
return true
}
func (t *Thread) writeMemory(addr uintptr, data []byte) (int, error) {
var count uintptr
err := _WriteProcessMemory(t.dbp.os.hProcess, addr, &data[0], uintptr(len(data)), &count)
if err != nil {
return 0, err
}
return int(count), nil
}
func (t *Thread) readMemory(addr uintptr, size int) ([]byte, error) {
if size == 0 {
return nil, nil
}
var count uintptr
buf := make([]byte, size)
err := _ReadProcessMemory(t.dbp.os.hProcess, addr, &buf[0], uintptr(size), &count)
if err != nil {
return nil, err
}
return buf[:count], nil
}