mirror of
https://github.com/go-delve/delve.git
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1418cfd385
This commit improves the handling of hardcoded breakpoints in Delve. A hardcoded breakpoint is a breakpoint instruction hardcoded in the text of the program, for example through runtime.Breakpoint. 1. hardcoded breakpoints are now indicated by setting the breakpoint field on any thread stopped by a hardcoded breakpoint 2. if multiple hardcoded breakpoints are hit during a single stop all will be notified to the user. 3. a debugger breakpoint with an unmet condition can't hide a hardcoded breakpoint anymore.
123 lines
2.9 KiB
Go
123 lines
2.9 KiB
Go
package native
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import (
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"fmt"
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sys "golang.org/x/sys/unix"
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"github.com/go-delve/delve/pkg/proc"
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)
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type waitStatus sys.WaitStatus
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// osSpecificDetails hold Linux specific
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// process details.
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type osSpecificDetails struct {
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delayedSignal int
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running bool
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setbp bool
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phantomBreakpointPC uint64
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}
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func (t *nativeThread) stop() (err error) {
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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("stop 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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// Stopped returns whether the thread is stopped at
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// the operating system level.
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func (t *nativeThread) Stopped() bool {
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state := status(t.ID, t.dbp.os.comm)
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return state == statusTraceStop || state == statusTraceStopT
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}
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func (t *nativeThread) resume() error {
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sig := t.os.delayedSignal
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t.os.delayedSignal = 0
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return t.resumeWithSig(sig)
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}
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func (t *nativeThread) resumeWithSig(sig int) (err error) {
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t.os.running = true
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t.dbp.execPtraceFunc(func() { err = ptraceCont(t.ID, sig) })
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return
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}
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func (t *nativeThread) singleStep() (err error) {
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sig := 0
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for {
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t.dbp.execPtraceFunc(func() { err = ptraceSingleStep(t.ID, sig) })
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sig = 0
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if err != nil {
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return err
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}
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wpid, status, err := t.dbp.waitFast(t.ID)
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if err != nil {
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return err
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}
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if (status == nil || status.Exited()) && wpid == t.dbp.pid {
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t.dbp.postExit()
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rs := 0
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if status != nil {
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rs = status.ExitStatus()
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}
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return proc.ErrProcessExited{Pid: t.dbp.pid, Status: rs}
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}
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if wpid == t.ID {
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switch s := status.StopSignal(); s {
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case sys.SIGTRAP:
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return nil
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case sys.SIGSTOP:
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// delayed SIGSTOP, ignore it
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case sys.SIGILL, sys.SIGBUS, sys.SIGFPE, sys.SIGSEGV, sys.SIGSTKFLT:
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// propagate signals that can have been caused by the current instruction
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sig = int(s)
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default:
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// delay propagation of all other signals
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t.os.delayedSignal = int(s)
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}
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}
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}
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}
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func (t *nativeThread) WriteMemory(addr uint64, data []byte) (written int, err error) {
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if t.dbp.exited {
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return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
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}
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if len(data) == 0 {
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return
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}
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// ProcessVmWrite can't poke read-only memory like ptrace, so don't
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// even bother for small writes -- likely breakpoints and such.
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if len(data) > sys.SizeofPtr {
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written, _ = processVmWrite(t.ID, uintptr(addr), data)
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}
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if written == 0 {
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t.dbp.execPtraceFunc(func() { written, err = sys.PtracePokeData(t.ID, uintptr(addr), data) })
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}
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return
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}
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func (t *nativeThread) ReadMemory(data []byte, addr uint64) (n int, err error) {
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if t.dbp.exited {
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return 0, proc.ErrProcessExited{Pid: t.dbp.pid}
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}
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if len(data) == 0 {
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return
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}
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n, _ = processVmRead(t.ID, uintptr(addr), data)
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if n == 0 {
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t.dbp.execPtraceFunc(func() { n, err = sys.PtracePeekData(t.ID, uintptr(addr), data) })
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}
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return
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}
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// SoftExc returns true if this thread received a software exception during the last resume.
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func (t *nativeThread) SoftExc() bool {
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return t.os.setbp
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}
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