There are persistent issues with watchpoints on Windows, it is not
clear whether it's a problem with the VM running the tests or if there
is a real bug in our implementation of hardware breakpoints on Windows.
Until the cause can be determined watchpoints on Windows will be
disabled.
Updates #2768
* service/dap: remove deadlock in TestLaunchDebugRequest
Fixes#2746
* terminal: fix TestScopePrefix flakiness
When there are more than 10 frames api.PrintStack will prefix the
output with spaces to right justify the frame number, which confuses
TestScopePrefix.
* _scripts: pass -buildvcs for Go 1.18 and later on TeamCity
Go 1.18 will try to stamp builds with the VCS version, this doesn't
work on TeamCity because the checkout isn't a valid repository (but
looks like it).
Pass -buildvcs=false to disable this feature.
* proc: switch to goroutine stack if first frame's func can not be found
If the first frame on the system stack can not be resolved to a
function switch directly to the goroutine stack.
Normally calls can't be performed on recorded processes, becuase the
future instructions executed by the target are predetermined. The rr
debugger however has a mechanism that allows this by taking the current
state of the recording and allowing it to diverge from the recording,
temporarily.
This commit adds support for starting and ending such diversions around
function calls.
Note: this requires rr version 5.5 of later to work, see:
https://github.com/rr-debugger/rr/pull/2748
* proc/native: always stop after RequestManualStop on Windows
On Windows RequestManualStop will generate an exception on a special
DbgUiRemoteBreakin thread, sometimes this thread will die before we
finish stopping the process. We need to account for that and still stop
even if the thread is gone and no other thread hit a breakpoint.
Fixes flakiness of TestIssue419.
* proc/native: fix watchpoints with new threads on Windows
When a new thread is created we must reapply all watchpoints to it,
like we do on linux.
* tests: be lenient on goroutinestackprog tests on Windows
We can not guarantee that we find all goroutines stopped in a good
place and sometimes the stacktrace fails on Windows.
Adds watchpoint support to gdbserver backend for rr debugger and
debugserver on macOS/amd64 and macOS/arm64.
Also changes stack watchpoints to support reverse execution.
Change debug_info type reader and proc to convert parametric types into
their real types by reading the corresponding dictionary entry and
using the same method used for interfaces to retrieve the DIE from a
runtime._type address.
'2586e9b1'.
With generics a single function can have multiple concrete
instantiations, the old version of FindFileLocation supported at most
one concrete instantiation per function and any number of inlined
calls, this supports any number of inlined calls and concrete
functions.
When the function we are calling is an autogenerated stub (because, for
example, we are calling it through a function pointer) the declaration
line of variables is meaningless and could cause us to discard valid
return arguments.
Go 1.18 removed the jmpdefer call from deferreturn, now deferreturn is
a normal function call that can appear on the stack, rules for
detecting a deferreturn call must be changed and new code must be added
to skip it while stepping out.
Internal breakpoints do not need IDs and assigning them from a counter
separate from the user ID counter can be a cause of confusion.
If a user breakpoint is overlayed on top of a pre-existing internal
breakpoint the temporary ID will be surfaced as if it was a user ID,
possibly conflicting with another user ID.
If a temporary breakpoint is overlayed on top of a pre-existing user
breakpoint and the user breakpoint is first deleted and then
re-created, the user ID will be resurrected along with the breakpoint,
instead of allocating a fresh one.
This change removes internal breakpoint IDs entirely, only user
breakpoints receive an ID.
Right now, if (*compositeMemory).WriteMemory needs to write a value to
a register that's smaller than the full size of the register (say, a
uint32 being passed as an argument), then (*AMD64Registers).SetReg can
later fail a sanity check that ensures the passed DwarfRegister is a
full size register.
Fix this by reading the old value of the register and overwriting just
the relevant parts with the new register. For the purposes of an
argument, it would probably be fine to just pad with zeroes, but merging
with the existing value is what gdb does.
Fixes#2698
Log points are special kinds of breakpoints that do not 'break' but instead log a message and then continue. This change implements basic log points that simply log the provided message, without any interpolation.
In order to resume execution after hitting a breakpoint, I added a new lock resumeMu and tracked the running state within the DAP server. resumeMu must be held in order to issue a debugger request that would start execution. This means it can be used to make sure that another goroutine does not resume execution while you are holding the lock.
Most of the synchronization logic is taken from PR #2530
Updates golang/vscode-go#123
* pkg/proc: update check for system goroutine
The finalizer goroutine can be either a system goroutine or a user goroutine. It is considered a user goroutine only when it calls back to user code. This change attempts to get closer to the implementation in the src/runtime/traceback.go by checking the value of fingRunning.
We could alternatively adopt the approximation done by src/cmd/trace/trace.go which only special cases "runtime.main", and always considers the finalizer to be a system goroutine.
If we cannot find debug information locally on the system, try and
invoke debuginfod-find in order to ask the linux distribution we're on
to find the debug information for us.
This patch enables the eBPF tracer backend to parse the ID of the
Goroutine which hit the uprobe. This implementation is specific to AMD64
and will have to be generalized further in order to be used on other
architectures.
Adds a script that check automatically that the the assumptions that
pkg/proc makes about runtime are met by the actual runtime, using a
combination of parsing and magic comments.
Also emits a file describing all the struct fields, constants and
variables of the runtime that we use in pkg/proc.
In order for DAP to support halting the program (either manually or on a breakpoint) performing some action and then resuming execution, there needs to be a way to stop the program without clearing the internal breakpoints. This is necessary for log points and stopping the program to set breakpoints.
The debugging UI makes it seem like a user should be able to set or clear a breakpoint at any time. Adding this ability to complete synchronous requests while the program is running is thus important to create a seamless user experience.
This change just adds a configuration to determine whether the target should clear the stepping breakpoints, and changes the server to use this new mode. Using the new mode means that the DAP server must determine when it expect the next to be canceled and do this manually.
* terminal,service: add way to see internal breakpoints
Now that Delve has internal breakpoints that survive for long periods
of time it will be useful to have an option to display them.
* proc,terminal,service: support stack watchpoints
Adds support for watchpoints on stack allocated variables.
When a stack variable is watched, in addition to the normal watchpoint
some support breakpoints are created:
- one breakpoint inside runtime.copystack, used to adjust the address
of the watchpoint when the stack is resized
- one or more breakpoints used to detect when the stack variable goes
out of scope, those are similar to the breakpoints set by StepOut.
Implements #279
* proc: move breakpoint condition evaluation out of backends
Moves breakpoint condition evaluation from the point where breakpoints
are set, inside ContinueOnce, to (*Target).Continue.
This accomplishes three things:
1. the breakpoint evaluation method needs not be exported anymore
2. breakpoint condition evaluation can be done with a full scope,
containing a Target object, something that wasn't possible before
because ContinueOnce doesn't have access to the Target object.
3. moves breakpoint condition evaluation out of the critical section
where some of the threads of the target process might be still
running.
* proc/native: handle process death during stop() on Windows
It is possible that the thread dies while we are inside the stop()
function. This results in an Access is denied error being returned by
SuspendThread being called on threads that no longer exist.
Delay the reporting the error from SuspendThread until the end of
stop() and only report it if the thread still exists at that point.
Fixes flakyness with TestIssue1101 that was exacerbated by moving
breakpoint condition evaluation outside of the backends.
* proc: Go 1.18 removes the _defer.siz field
As of Go 1.17, the _defer.siz field is always 0 because _defer no
longer stores defer call arguments at all. golang.org/cl/326062
removes it entirely for Go 1.18. Simply treat it as 0 if the field is
missing from the _defer type.
* proc: Go 1.18 changes _defer.fn from *funcval to func()
golang.org/cl/325918 changed the type of the _defer.fn field from
*funcval to func() for Go 1.18. This CL was later reverted because it
caused failures in Delve, but we would like to un-revert it. Handle
this change by inspecting the type of this field before decoding it.
* pkg/proc: Prefer throw instead of fatalthrow
Currently there is a breakpoint set at runtime.fatalthrow to catch any
situation where the runtime crashes (e.g. deadlock).
When we do this, we go up a frame in order to parse the crash reason.
The problem is that there is no guarentee the "s" variable we attempt to
parse will still be considered "live".
Since runtime.fatalthrow is never called directly, set a breakpoint on
runtime.throw instead and prevent having
to search up a stack frame in order to
get the throw reason.
Fixes#2602
* service/dap: Fix TestFatalThrowBreakpoint
* Reenable TestFatalThrow DAP test
* service/dap: Don't skip test on < 1.17
* service/dap: Update test constraint for 1.16
* pkg/proc: Reinstate runtime.fatalthrow as switchstack exception
StaticBase is the difference between the entry point declared in the
image file and the entry point as loaded in memory, since this
difference could be a negative number we have to use a signed
comparison when searching for a mapping.
Causes intermittent test failures on windows when resolving interface
types for position independent executables.
Fixes#2620
Conversion form a moduledata object into an image object was
implemented by looking for a function covering the start address of the
text section of the moduledata object, and then converting that into
its corresponding image.
Unfortunately this seems to not always work. In particular it does not
work on linux/386 with go1.17 (but it might also fail on other
combinations): the start address of the text section is, for whatever
reason, not part of any function.
As a fallback simply scan all images we know of and return the closest
one that has start address less than or equal to the start address of
the text section we are looking for.
Fixes TestPluginVariables on go1.17/linux/386.
Fixes#2611
Co-authored-by: a <a@kra>
Changes Breakpoint to allow multiple overlapping internal breakpoints
on the same instruction address.
This is done by changing the Breakpoint structure to contain a list of
"breaklets", each breaklet has a BreakpointKind and a condition
expression, independent of the other.
A breakpoint is considered active if any of its breaklets are active.
A breakpoint is removed when all its breaklets are removed.
We also change the terminology "internal breakpoint" to "stepping
breakpoint":
HasInternalBreakpoints -> HasSteppingBreakpoints
IsInternal -> IsStepping
etc...
The motivation for this change is implementing watchpoints on stack
variables.
Watching a stack variable requires also setting a special breakpoint to
find out when the variable goes out of scope. These breakpoints can not
be UserBreakpoints because only one user breakpoint is allowed on the
same instruction and they can not be internal breakpoints because they
should not be cleared when a next operation is completed (they should
be cleared when the variable watch is cleared).
Updates #279
This PR aims to add support for rr replay and core actions from the DAP layer. This basically encloses the following:
New launch modes: replay and core
The following modes are added:
replay: Replays an rr trace, allowing backwards flows (reverse continue and stepback). Requires a traceDirPath property on launch.json pointing to a valid rr trace directory.
Equivalent to dlv replay <tracedir> command.
core: Replays a core dump file, showing its callstack and the file matching the callsite. Requires a coreFilePath property on launch.json pointing to a valid coredump file.
Equivalent to dlv core <exe> <corefile> command.
Dependencies
To achieve this the following additional changes were made:
Implement the onStepBackRequest and onReverseContinueRequest methods on service/dap
Adapt onLaunchRequest with the requried validations and logic for these new modes
Use CapabilitiesEvent responses to enable the StepBack controls on the supported scenarios (see dicussion here)
Add the corresponding launch.json support on vs code:
Support for replay and core modes golang/vscode-go#1268
* proc: support new Go 1.17 panic/defer mechanism
Go 1.17 will create wrappers for deferred calls that take arguments.
Change defer reading code so that wrappers are automatically unwrapped.
Also the deferred function is called directly by runtime.gopanic, without going through runtime.callN which means that sometimes when a panic happens the stack is either:
0. deferred function call
1. deferred call wrapper
2. runtime.gopanic
or:
0. deferred function call
1. runtime.gopanic
instead of always being:
0. deferred function call
1. runtime.callN
2. runtime.gopanic
the isPanicCall check is changed accordingly.
* test: miscellaneous minor test fixes for Go 1.17
* proc: resolve inlined calls when stepping out of runtime.breakpoint
Calls to runtime.Breakpoint are inlined in Go 1.17 when inlining is
enabled, resolve inlined calls in stepInstructionOut.
* proc: add support for debugCallV2 with regabi
This change adds support for the new debug call protocol which had to
change for the new register ABI introduced in Go 1.17.
Summary of changes:
- Abstracts over the debug call version depending on the Go version
found in the binary.
- Uses R12 instead of RAX as the debug protocol register when the binary
is from Go 1.17 or later.
- Creates a variable directly from the DWARF entry for function
arguments to support passing arguments however the ABI expects.
- Computes a very conservative stack frame size for the call when
injecting a call into a Go process whose version is >=1.17.
Co-authored-by: Michael Anthony Knyszek <mknyszek@google.com>
Co-authored-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
* TeamCity: enable tests on go-tip
* goversion: version compatibility bump
* TeamCity: fix go-tip builds on macOS/arm64
Co-authored-by: Michael Anthony Knyszek <mknyszek@google.com>
ConvertEvalScope() attempts to find the scope for the specified
goroutine id and frame index. If the goroutine that is found is nil,
then it falls back to the threads stack trace to find the scope.
This fix makes sure that the frame id is taken into account for
thread strack traces as well.
We told clients that further loading of variables can be done by
specifying a type cast using the address of a variable that we
returned.
This does not work for registerized variables (or, in general,
variables that have a complex location expression) because we don't
give them unique addresses and we throw away the compositeMemory object
we made to read them.
This commit changes proc so that:
1. variables with location expression divided in pieces do get a unique
memory address
2. the compositeMemory object is saved somewhere
3. when an integer is cast back into a pointer type we look through our
saved compositeMemory objects to see if there is one that covers the
specified address and use it.
The unique memory addresses we generate have the MSB set to 1, as
specified by the Intel 86x64 manual addresses in this form are reserved
for kernel memory (which we can not read anyway) so we are guaranteed
to never generate a fake memory address that overlaps a real memory
address of the application.
The unfortunate side effect of this is that it will break clients that
do not deserialize the address to a 64bit integer. This practice is
contrary to how we defined our types and contrary to the specification
of the JSON format, as of json.org, however it is also fairly common,
due to javascript itself having only 53bit integers.
We could come up with a new mechanism but then even more old clients
would have to be changed.
Adds filtering and grouping to the goroutines command.
The current implementation of the goroutines command is modeled after
the threads command of gdb. It works well for programs that have up to
a couple dozen goroutines but becomes unusable quickly after that.
This commit adds the ability to filter and group goroutines by several
different properties, allowing a better debugging experience on
programs that have hundreds or thousands of goroutines.
While Go still mostly uses DWARF v4, newer versions of GCC will emit
DWARF v5 by default. This patch improves support for DWARF v5 by parsing
the .debug_line_str section and using that during file:line lookups.
This patch only includes support for files, not directories.
Co-authored-by: Derek Parker <deparker@redhat.com>
Ensure that any command executed after the process we are trying to
debug prints a correct and consistent exit status.
Previously the exit code was being lost after the first time we printed
that a process has exited. Additionally, certain commands would print
the PID of the process and other would not. This change makes everything
more correct and consistent.
If the client supports paging, we allow them to fetch array and slice items in chunks that we assume will be of a reasonable size. For example, VS Code requests indexed variables in chunks of 100.
Fixesgolang/vscode-go#1518
If the base address isn't set then indexing and slicing will not work.
Large floating point registers already had the base set but small
general purpose registers did not.
* pkg/proc: implement support for hit count breakpoints
* update comment
* udpate hitcount comment
* update HitCond description
* add test for hit condition error
* respond to review
* service/dap: add support for hit count breakpoints
* use amendbps to preserve hit counts
* update test health doc
* fix failing test
* simplify hit conditions
* REmove RequestString, use name instead
* update backend_test_health.md
* document hit count cond
* fix tests
Adds DWARF register number and support for AVX-512 registers.
Changes proc/gdbserial so that the 'g' and 'G' commands are never used
with debugserver since they seem to corrupt the thread state when used
on AVX-512 capable hardware.
Also changes TestClientServer_FpRegisters to be simpler and more
resilient to changes to the Go runtime.
Fixes#2479
The code populating runtimeTypeToDIE was incorrectly adding StaticBase
to the offset. We never noticed because on statically compiled
executables StaticBase is always zero and on PIE and plugins the
fallback code took care of the problem anyway.
A change in Go 1.17 broke the fallback code, making the issue apparent.
This commit fixes the setup of runtimeTypeToDIE and disables the
fallback code for Go 1.17 and later.
This change also fixes a rare failure in TestPluginVariables when PIE
is enabled.
Truncates the result of binary operations on integers to the size of
the resulting type.
Also rewrites convertInt to not require allocations.
Fixes#2454
The maintainer of debugserver says he wants to fix the problem with the
'g' command but doesn't know when it will happen. Treat the error 'E74'
for the 'g' command on debugserver as if the server had returned an
unsupported error so that, for this specific problem, the error doesn't
resurface in the future.
A RequestManualStop received while the target program is stopped can
induce a crash when the target is restarted.
This is caused by the phantom breakpoint detection that was introduced
in PR #2179 / commit e69d536.
Instead of always interpreting an unexplained SIGTRAP as a phantom
breakpoint memorize all possible unreported breakpoint hits and only
act on it when the thread hasn't moved from one.
Also clarifies the behavior of the halt command when it is received
while the target is stopped or in the process of stopping.
Handle the signaled status for the thread leader like we handle the
exited status, by returning ErrProcessExited and recording the killer
signal in it.
Prior to this commit we would find out about the death of the thread
later in the loop, the condition would still be reported as
ErrProcessExited, but without recording the signal number anywhere.
Also fixes a bug in TestAttachStopOnEntry where the test would
inadvertently cause a SIGPIPE to be sent to the target process, making
it terminate early.
* service/dap: add type information to dap variables
* add comment explaining map type choice
* rename to setClientCapabilities
* respond to review
* update TypeString definition
Adds the low-level support for watchpoints (aka data breakpoints) to
the native linux/amd64 backend.
Does not add user interface or functioning support for watchpoints
on stack variables.
Updates #279
Changes the expression evaluation code so that register names, when not
shadowed by local or global variables, will evaluate to the current
value of the corresponding CPU register.
This allows a greater flexibility with displaying CPU registers than is
possible with using the ListRegisters API call. Also it allows
debuggers users to view register values even if the frontend they are
using does not implement a register view.
There seems to be a problem where debugserver will leave a zombie
process instead of detaching correctly, we are sending the right
commands, it doesn't seem to be a problem with Delve.
We have some places where we use proc.ErrProcessExited and some places
that use &proc.ErrProcessExited, resulting in checks for process exited
errors occasionally failing on some architectures.
Uniform use of ErrProcessExited to the non-pointer version.
Fixes intermittent failure of TestStepOutPreservesGoroutine.
When restarting we must take care of setting breakpoint IDs correctly
so that enabled breakpoints do not end up having the same ID as a
disabled breakpoint, also we must make sure that breakpoints created
after restart will not get an ID already used by a disabled breakpoint.
* Adds toggle command
Also adds two rpc2 tests for testing the new functionality
* Removes Debuggers' ToggleBreakpoint method
rpc2's ToggleBreakpoint now calls AmendBreakpoint
Refactors the ClearBreakpoint to avoid a lock.
This adds a workaround for the bug described at:
https://github.com/golang/go/issues/25841
Because dsymutil running on PIE does not adjust the address of
debug_frame entries (but adjusts debug_info entries) we try to do the
adjustment ourselves.
Updates #2346
- remove github workflow for testing macOS/amd64 that is now covered by
TeamCity
- fix DeepSource glob patterns to actually match what they are intended
to match (did the interpretation change?)
- disable some cgo tests on darwin/arm64
Delve represents registerized variables (fully or partially) using
compositeMemory, implementing proc.(*compositeMemory).WriteMemory is
necessary to make SetVariable and function calls work when Go will
switch to using the register calling convention in 1.17.
This commit also makes some refactoring by moving the code that
converts between register numbers and register names out of pkg/proc
into a different package.
* TeamCity: add linux/arm64/tip configuration
So that it can be tested when we make the next-version-support-branch.
* tests: disable failing cgo tests on arm64
When cgo is used the address of the g struct is saved on the special
register TPIDR_EL0. Because executing C code could overwrite the
contents of R28 that normally contains the address of g we should read
it from TPIDR_EL0 instead when runtime.iscgo is set.
* Reformat pkg/locspec documentation so that it is formatted correctly
by godoc/pkgsite
* Unexport some types and variables in proc that don't need to be
exported.
* proc/core: off-by-one error reading ELF core files
core.(*splicedMemory).ReadMemory checked the entry interval
erroneously when dealing with contiguous entries.
* terminal,service,proc/*: adds dump command (gcore equivalent)
Adds the `dump` command that creates a core file from the target process.
Backends will need to implement a new, optional, method `MemoryMap` that
returns a list of mapped memory regions.
Additionally the method `DumpProcessNotes` can be implemented to write out
to the core file notes describing the target process and its threads. If
DumpProcessNotes is not implemented `proc.Dump` will write a description of
the process and its threads in a OS/arch-independent format (that only Delve
understands).
Currently only linux/amd64 implements `DumpProcessNotes`.
Core files are only written in ELF, there is no minidump or macho-o writers.
# Conflicts:
# pkg/proc/proc_test.go
Both structMember and findMethod implemented a depth-first search in
embedded fields but the Go specification requires a breadth-first
search. They also allowed promotion of fields in the concrete type of
embedded interfaces even though this is not allowed by Go.
Furthermore they both lacked protection from infinite recursion
when a type embeds itself and the user requests a non-existent field.
Fixes#2316
Add a helper method for collecting line table file references that
does the correct thing for DWARF 5 vs DWARF 4 (in the latter case you
have an implicit 0 entry which is the comp dir, whereas in the former
case you do not). This is to avoid out-of-bounds errors when examining
the file table section of a DWARF 5 compilation unit's line table.
Included is a new linux/amd-only test that includes a precompiled C
object file with a DWARF-5 section that triggers the bug in question.
Fixes#2319
The DWARF standard does not say that a DW_ATTR_abstract_origin can only
reference entries that appear before it, this change fixes BinaryInfo
to comply. See #2284 for an example of this happening.
Changs TestClientServer_FullStacktrace and
Test1ClientServer_FullStacktrace to log more information, also removes
code from TestFrameEvaluation that could mask the error.
Updates #2231
* add -json flag when running tests on TeamCity
* introduce TeamCity builds
* restore gdbserial constants for 386
Otherwise compilation fails.
* skip TestAttachRequest on Windows as it never finishes
* run tests on 1.16beta1
* proc: misc test fixes for Go 1.16
* proc: fix cgo stacktraces in Go 1.16 with simplified C -> Go call path
* dwarf/line: make dwarf/line correct when '\\' are used
Our code depends heavily on paths being '/' separated because go always
produced '/' separated file paths. The call to filepath.Join will
normalize the paths, on windows, to always be '\\' separated, which
violated our assumptions.
This didn't use to be a problem because the codepath that calls
filepath.Join was never exercised by executable files produced by Go,
but Go 1.16 started producing debug_line sections that use the
directory table with https://go-review.googlesource.com/c/go/+/263017/.
Fix this to always use path.Join after making sure, on windows, to
always normalize paths to use '/' as a separator. Replace the use of
filepath.IsAbs with an operating system independent version.
* goversion: bump supported Go version
If a thread exits while we are looking at it just treat it as if the
status had reported it as exited instead of doing something special.
Fixes flakiness in TestIssue387.
Fix bug in DAP test: TestEvaluateCallRequest.
In Go 1.15 the call injection will be executed on a different goroutine
from the goroutine where it was started on to avoid confusing the
garbage collector, the test must be aware of this fact and use the
goroutine ID from the stopped response instead of assuming 1 is the
currently selected goroutine.
Disables TestAttachDetach when running in Github Actions.
Disable some coredump tests when running in Github Actions (core size
limits?).
The comment on the advanceRegs() method was referencing several
nonexistent fields. This patch fixes that, and improves the comment to
reference the peculiar interaction between the method and it.regs.
evalFunctionCall needs to remove the breakpoint from the current thread
after starting the function call injection, otherwise Continue will
think that the thread is stopped at a breakpoint and return to the user
instead of continuing the call injection.
Adds a flag that distinguishes the return values of an injected
function call from the return values of a function call executed by the
target program.
* Use the active xcode-select path instead of a hardcoded Xcode path
* Refactored exec.Command to invoke Output instead of running with a custom buffer for stdout
Addresses review comment by @derekparker
1. Forward stdin/stdout/stderr to the target process when in foreground
mode instead of always forwarding the current tty (issue #1964)
2. When redirecting a file descriptor make sure to also specify
something for all three otherwise debugserver will misbehave (either
exit on launch or run but giving the target process a closed file
descriptor).
Fixes#1964
On linux we can not read memory if the thread we use to do it is
occupied doing certain system calls. The exact conditions when this
happens have never been clear.
This problem was worked around by using the Blocked method which
recognized the most common circumstances where this would happen.
However this is a hack: Blocked returning true doesn't mean that the
problem will manifest and Blocked returning false doesn't necessarily
mean the problem will not manifest. A side effect of this is issue
#2151 where sometimes we can't read the memory of a thread and find its
associated goroutine.
This commit fixes this problem by always reading memory using a thread
we know to be good for this, specifically the one returned by
ContinueOnce. In particular the changes are as follows:
1. Remove (ProcessInternal).CurrentThread and
(ProcessInternal).SetCurrentThread, the "current thread" becomes a
field of Target, CurrentThread becomes a (*Target) method and
(*Target).SwitchThread basically just sets a field Target.
2. The backends keep track of their own internal idea of what the
current thread is, to use it to read memory, this is the thread they
return from ContinueOnce as trapthread
3. The current thread in the backend and the current thread in Target
only ever get synchronized in two places: when the backend creates a
Target object the currentThread field of Target is initialized with the
backend's current thread and when (*Target).Restart gets called (when a
recording is rewound the currentThread used by Target might not exist
anymore).
4. We remove the MemoryReadWriter interface embedded in Thread and
instead add a Memory method to Process that returns a MemoryReadWriter.
The backends will return something here that will read memory using
the current thread saved by the backend.
5. The Thread.Blocked method is removed
One possible problem with this change is processes that have threads
with different memory maps. As far as I can determine this could happen
on old versions of linux but this option was removed in linux 2.5.
Fixes#2151
TestStepConcurrentDirect will occasionally fail (7% of the time on my
setup) by either causing the target processs to execute an invalid
instruction or (more infrequently) by switching to the wrong thread.
Both of those are caused by receiving SIGTRAPs for threads hitting a
breakpoint after it has been removed (the thread hits the breakpoint,
we stop everything and remove the breakpoint and only after we receive
the signal).
Change native.(*nativeProcess).stop to handle SIGTRAPs that can't be
attributed to a breakpoint, a hardcoded breakpoint in the program's
text, or manual stops (and therefore are likely caused by phantom
breakpoint hits).
Co-authored-by: a <a@kra>
Due to a missing check TestCgoStacktrace2 didn't actually check
anything. Enable it and then skip it on linux/386 and linux/arm64 where
it's broken.
Co-authored-by: a <a@kra>
If the process receives a signal (or sends a singal to itself) and then
dies before we can route the signal back to it we still need to
retrieve its exit status.
Fixes a rare failure of TestIssue1101 in proc_test.go
Co-authored-by: a <a@kra>
* proc/tests: keep track of tests skipped due to backend problems
Mark tests skipped due to backend problems and add a script to keep
track of them.
* Travis-CI: add ignorechecksum option to chocolatey command
Looks like a configuration problem on chocolatey's end.
* proc: use argument position for addr only when injecting function calls
We can not, in general, use the argument position to determine the
address of a formal parameter, it will not work in presence of
optimizations or inlining. In those cases formal arguments could be
stored in registers.
Fixes#2176
* Travis-CI: add ignorechecksum option to chocolatey command
Looks like a configuration problem on chocolatey's end.
Co-authored-by: a <a@kra>
* Revert "proc: Find executable should follow symbol links."
This reverts commit 3e04ad0fada0c3ab57caf58bc024e4c0f9a3e01a.
* proc: resolve symlinks when searching for split debug_info if path is /proc/pid/exe
Fixes#2168
During the testing of the core dump generation feature two bugs were
discovered in gdbserial:
1. we don't check that both bytes of the checksum are read, if the
buffer only has one byte we can end up reading only one byte instead
of two and the second byte will mess up the parsing of the next
packet
2. binary encoded packets can start with an 'E' and not be errors, when
using binary responses add an extra check for the lenght of the
response before deciding that the response is an error.
Unfortunately this encoding is inherently ambiguous (we can't
distinguish a 3 byte response starting with 'E' from an error) so
binary requests that lead to short responses should be avoided.
Testing this is complicated, they will be tested implicitly by the
upcoming core dump test.
Co-authored-by: a <a@kra>
Since proc is supposed to work independently from the target
architecture it shouldn't use architecture-dependent types, like
uintptr. For example when reading a 64bit core file on a 32bit
architecture, uintptr will be 32bit but the addresses proc needs to
represent will be 64bit.
Adds features to support default file descriptor redirects for the
target process:
1. A new command line flag '--redirect' and '-r' are added to specify
file redirects for the target process
2. New syntax is added to the 'restart' command to specify file
redirects.
3. Interactive instances will check if stdin/stdout and stderr are
terminals and print a helpful error message if they aren't.
An internal breakpoint condition shouldn't ever error:
* use a ThreadContext to evaluate conditions if a goroutine isn't
available
* evaluate runtime.curg to a fake g variable containing only
`goid == 0` when there is no current goroutine
Fixes#2113
Recent changes to the way registers are handled broke reporting of AVX
registers (i.e. YMMx). This change restores the functionality by:
- concatenating the higher half of the YMMx registers to their
corresponding XMMx lower half (YMMx registers do not have an
independent DWARF register number)
- modifying the formatSSEReg function to handle them when they are
present.
Fixes#2033
Commit 1ee8d5c reviewed in Pull Request #1960 relaxed some tests using
goroutinestackprog but missed others.
Fixes some test flakiness that isn't relevant.
* proc: start variable visibility one line after their decl line
In most cases variables shouldn't be visible on their declaration line
because they won't be initialized there.
Function arguments are treated as an exception.
This fix is only applied to programs compiled with Go 1.15 or later as
previous versions of Go did not report the correct declaration line for
variables captured by closures.
Fixes#1134
* proc: silence go vet error
* Makefile: enable PIE tests on windows/Go 1.15
* core: support core files for PIEs on windows
* goversion: add Go 1.15 to supported versions
* proc: fix function call injection for Go 1.15
Go 1.15 changed the call injection protocol so that the runtime will
execute the injected call on a different (new) goroutine.
This commit changes the function call support in delve to:
1. correctly track down the call injection state after the runtime
switches to a different goroutine.
2. correctly perform the escapeCheck when stack values can come from
multiple goroutine stacks.
* proc: miscellaneous fixed for call injection under macOS with go 1.15
- create copy of SP in debugCallAXCompleteCall case because the code
used to assume that regs doesn't change
- fix automatic address calculation for function arguments when an
argument has a spurious DW_OP_piece at entry
The file:line information for the entrypoint is more acccurate than the
file:line information at a return point, which could be affected by a
compiler bug.
Fixes#2086
Recent change #2061:
292f5c69f0c769fd32c2e8b1e7153b56e908efd7
proc: step into unexported runtime funcs when already inside runtime
means that TestIssue414 (which tries to step repeatedly until the
program exits) can now steps through way more runtime code than it ever
did before. This causes this test to occasionally fail. Stepping
blindly through runtime code has never been particularly safe as the
runtime can switch to a different goroutine causing Delve to misbehave.
This change restores the previous behavior of TestIssue414 where Step
behaved like Next inside runtime code.
These methods only work if registers have been loaded once after the
last resume, there's probably no code path that calls SetXX before
Thread.Registers but lets make sure it can't happen anyway.
