Instead of panicing for sending on a closed channel, detect that the
process has exited and return a proper error message.
This patch also cleans up some spots where the Pid is omitted from the
error.
Fixes#920
Mozilla RR will create a trace directory that can be reused with the
replay verb, however if we delete the executable file the trace
directory will become useless, so delete that too before exit.
Users that wish to reuse a recording should build the executable
themselves and then use either dlv exec or rr record to do the
recording.
If the user tries to list the contents of a function pointer but
forgets the '*' operator the location lookup will fail and result in a
unhelpful "location not found" error.
Instead if the location lookup fails we should try interpreting the
locspec as if it was preceded by '*'.
* proc/native: make sure debugged executable can be deleted on windows
Delve opens debugged executable to read binary info it
contains, but it never closes the file. Windows will not
let you delete file that is opened. So close Process.bi
in Process.postExit, and actually call Process.postExit
from windows Process.Kill.
Also Windows sends some debugging events
(EXIT_PROCESS_DEBUG_EVENT event in particular) after Delve
calls TerminateProcess. The events need to be consumed by
debugger before debugged process will be released by
Windows. So call Process.waitForDebugEvent after
TerminateProcess in Process.Kill.
Fixes#398
* cmd/dlv: make TestIssue398 pass on darwin
* cmd/dlv: add comment for TestIssue398
* proc/native: wait for debuggee to exit before returning from windows Process.Kill
* proc/native: close process handle before returning from windows killProcess
* proc/native: remove not used Process.Process
When stepping through runtime sometimes the current goroutine will
change. It is impossible to handle this in Next, Step and StepOut but
StepInstruction can reset the current goroutine correctly.
When the process exits during we used to return an error, but after
commit 8bbcc89711f4263e7bb2b6d9c00fa96d0294e56f we move the error into
state.Err. Revert this behavior change.
If one of the expressions that are automatically evaluated when a
breakpoint is hit can't be evaluated breakpoint information collection
should continue and the error should be returned for that specific
expression instead of the whole command.
Next will add internal breakpoints with nil condition if it can't find
the current goroutine (possibly because there isn't a current goroutine
because the runtime hasn't been initialized yet).
onNextGoroutine should skip breakpoints with nil condition, otherwise
we'll end up with an internal debugger error trying to walk a nil
expression.
Updates #893
When there's a error reading the stack trace the call stack itself
could be corrupted and we should return the partial stacktrace that we
have.
Fixes#868
When location spec is given and the base can be interpreted either in
source file name or function name, NomalLocationSpec searches both
the source file list and the function symbol list, and selects matching
candidates. Previously, all the matching candidates were added to one
single list regardless whether the candidate was from the source file
list or not. Then, later, Find tries to guess whether the candiate
was a function or a file based on a heuristic, i.e, whether the
candidate is an absolute file path. The heuristic is fragile - since
there is no guarantee that the included source file name is an absolute
path.
Instead, this CL preserves where the candidate was found; file list or
function symbol list. Then, use that info to determine whether the
candidate is a source file name or not.
Variable lookup is slow because it requires a full scan of debug_info
to check for package variables, this doesn't matter much in interactive
use but can slow down evaluation of breakpoint conditions
significantly.
Providing benchmark proof for this is hard since this effect doesn't
show for small programs with small debug_info sections.
* proc: fix interaction of RequestManualStop and conditional breakpoints
A conditional breakpoint that is hit but has the condition evaluate to
false can block a RequestManualStop from working. If the conditional
breakpoint is set on an instruction that is executed very frequently by
multiple goroutines (or many conditional breakpoints are set) it could
prevent all calls to RequestManualStop from working.
This commit fixes the problem by changing proc.Continue to exit
unconditionally after a RequestManualStop is called.
* proc/gdbserial: fix ContinueOnce getting stuck on macOS
Fixes#902
The concrete value of an interface is always stored as a pointer inside
an interface variable. So far we have followed the memory layout and
reported the type of the 'data' attribute of interfaces as a pointer,
however this makes it impossible to distinguish interfaces with
concrete value of type 'A' from interfaces of concrete value of type
'*A'.
With this changeset when we autodereference pointers when the concrete
type of an interface is not a pointer.
* Fix various issues detected by megacheck
I've ran honnef.co/go/tools/cmd/megacheck and fixed a few of the
things that came up there.
* Cleanup using Gogland
When a Go program is externally linked, the external linker is
responsible for picking the TLS offset. It records its decision in the
runtime.tlsg symbol. Read the offset from that rather than guessing -16.
This implementation causes a regression: 1.4 and earlier will no longer
work.
Other debuggers can be instructed to decorate the stacktrace with the
value of SP. Our SP equivalent is the frame offset, since we can add it
to the Stackframe structure without incurring into added costs we
should, so that frontends can use it if they want.
A next/step/stepout command could hit a normal breakpoint, decorated
with a list of variables to evaluate, if that happens the variable
should be evaluated just as if the breakpoint was hit by a continue.
Implementing proc.Process.Running in a thread safe way is complicated
and nothing actually uses it besides tests, so we are better off
rewriting the tests without Running and removing it.
In particular:
* The call to d.target.Running() in service/debugger/debugger.go
(Restart) can never return true because that line executes while
holding processMutex and all continue operations are also executed
while holding processMutex.
* The call to dbp.Running() pkg/proc/native/proc.go (Detach) can never
return true, because it's only called from
debugger.(*Debugger).detach() which is also always called while
holding processMutex.
Since some tests are hard to write correctly without Process.Running a
simpler interface, Process.NotifyResumed, is introduced.
Fixes#830
RequestManualStop will run concurrently with trapWait, since one writes
dbp.halt and the other reads it dbp.halt should be protected by a
mutex.
Updates #830
type M struct was never used (as far as I know).
type VariableEval interface was used for a brief period of time during
the refactoring, now both its methods are functions.
The authorization prompt on macOS can take a long time to be
acknowledged by the user, we should keep waiting for a connection as
long as the debugserver instance we launched remains alive.
Before this commit our temp breakpoints only checked that we would stay
on the same goroutine.
However this isn't enough for recursive functions we must check that we
stay on the same goroutine AND on the same stack frame (or, in the case
of the StepOut breakpoint, the previous stack frame).
This commit:
1. adds a new synthetic variable runtime.frameoff that returns the
offset of the current frame from the base of the call stack.
This is similar to runtime.curg
2. Changes the condition used for breakpoints on the lines of the
current function to check that runtime.frameoff hasn't changed.
3. Changes the condition used for breakpoints on the return address to
check that runtime.frameoff corresponds to the previous frame in the
stack.
4. All other temporary breakpoints (the step-into breakpoints and defer
breakpoints) remain unchanged.
Fixes#828
Debugserver does not work as documented, "--" needs to be specified to
pass arguments to the target process (but only if it's an argument that
starts with a dash).
Fixes#839
