Changes implementations of proc.Registers interface and the
op.DwarfRegisters struct so that floating point registers can be loaded
only when they are needed.
Removes the floatingPoint parameter from proc.Thread.Registers.
This accomplishes three things:
1. it simplifies the proc.Thread.Registers interface
2. it makes it impossible to accidentally create a broken set of saved
registers or of op.DwarfRegisters by accidentally calling
Registers(false)
3. it improves general performance of Delve by avoiding to load
floating point registers as much as possible
Floating point registers are loaded under two circumstances:
1. When the Slice method is called with floatingPoint == true
2. When the Copy method is called
Benchmark before:
BenchmarkConditionalBreakpoints-4 1 4327350142 ns/op
Benchmark after:
BenchmarkConditionalBreakpoints-4 1 3852642917 ns/op
Updates #1549
This flag allows users on UNIX systems to set the tty for the program
being debugged by Delve. This is useful for debugging command line
applications which need access to their own TTY, and also for
controlling the output of the debugged programs so that IDEs may open a
dedicated terminal to show the output for the process.
The test was always flaky because we can't fully control the state of
all goroutines in the target program, Go 1.14's asynchronous preemption
exacerbates the problem.
See for example:
https://travis-ci.com/github/go-delve/delve/jobs/302407282
This commit relaxes the checks made by the test to avoid irrelevante
flakiness.
Under some circumstances (methods with non-pointer receivers or from
embedded fields called through an interface) the compiler will
autogenerate wrapper functions.
This commit changes next, step and stepout to skip all autogenerated
wrappers.
Fixes#1908
Reset the timer once we start executing the code paths we actually care
to measure, since the setup and continue steps can be relatively
expensive.
Also, disable recording on benchmarks. This seems less useful, and also
cuts out a lot of noise when benchmarks are run.
Inserts a call to ClearAllGCache into stepInstructionOut so that cached
goroutine state is not inconsistent after an injected function call.\
Fixes#1925
* *: Fix go vet struct complaints
* *: Fix struct vet issue on linux
* *: Ignore proc/native in go vet check
We have to do some unsafe pointer manipulation that will never make go
vet happy within the proc/native package. Ignore it for runs of go vet.
* proc: move defer breakpoint code into a function
Moves the code that sets a breakpoint on the first deferred function,
used by both next and StepOut, to its function.
* proc: implement reverse step/next/stepout
When the direction of execution is reversed (on a recording) Step, Next and
StepOut will behave similarly to their forward version. However there are
some subtle interactions between their behavior, prologue skipping, deferred
calls and normal calls. Specifically:
- when stepping backwards we need to set a breakpoint on the first
instruction after each CALL instruction, once this breakpoint is reached we
need to execute a single StepInstruction operation to reverse step into the
CALL.
- to insure that the prologue is skipped reverse next needs to check if it
is on the first instruction after the prologue, and if it is behave like
reverse stepout.
- there is no reason to set breakpoints on deferred calls when reverse
nexting or reverse stepping out, they will never be hit.
- reverse step out should generally place its breakpoint on the CALL
instruction that created the current stack frame (which will be the CALL
instruction immediately preceding the instruction at the return address).
- reverse step out needs to treat panic calls and deferreturn calls
specially.
* service,terminal: implement reverse step, next, stepout
Implement debugging function for 386 on linux with reference to AMD64.
There are a few remaining problems that need to be solved in another time.
1. The stacktrace of cgo are not exactly as expected.
2. Not implement `core` for now.
3. Not implement `call` for now. Can't not find `runtime·debugCallV1` or
similar function in $GOROOT/src/runtime/asm_386.s.
Update #20
* tests: misc test fixes for go1.14
- math.go is now ambiguous due to changes to the go runtime so specify
that we mean our own math.go in _fixtures
- go list -m requires vendor-mode to be disabled so pass '-mod=' to it
in case user has GOFLAGS=-mod=vendor
- update version of go/packages, required to work with go 1.14 (and
executed go mod vendor)
- Increased goroutine migration in one development version of Go 1.14
revealed a problem with TestCheckpoints in command_test.go and
rr_test.go. The tests were always wrong because Restart(checkpoint)
doesn't change the current thread but we can't assume that when the
checkpoint was taken the current goroutine was running on the same
thread.
* goversion: update maximum supported version
* Makefile: disable testing lldb-server backend on linux with Go 1.14
There seems to be some incompatibility with lldb-server version 6.0.0
on linux and Go 1.14.
* proc/gdbserial: better handling of signals
- if multiple signals are received simultaneously propagate all of them to the
target threads instead of only one.
- debugserver will drop an interrupt request if a target thread simultaneously
receives a signal, handle this situation.
* dwarf/line: normalize backslashes for windows executables
Starting with Go 1.14 the compiler sometimes emits backslashes as well
as forward slashes in debug_line, normalize everything to / for
conformity with the behavior of previous versions.
* proc/native: partial support for Windows async preempt mechanism
See https://github.com/golang/go/issues/36494 for a description of why
full support for 1.14 under windows is problematic.
* proc/native: disable Go 1.14 async preemption on Windows
See https://github.com/golang/go/issues/36494
* pkg/proc: Introduce Target
* pkg/proc: Remove Common.fncallEnabled
Realistically we only block it on recorded backends.
* pkg/proc: Move fncallForG to Target
* pkg/proc: Remove CommonProcess
Remove final bit of functionality stored in CommonProcess and move it to
*Target.
* pkg/proc: Add SupportsFunctionCall to Target
* proc: separate amd64-arch code
separate amd64 code about stacktrace, so we can add arm64 stacktrace code.
* proc: implemente stacktrace of arm64
* delve now can use stack, frame commands on arm64-arch debug.
Co-authored-by: tykcd996 <tang.yuke@zte.com.cn>
Co-authored-by: hengwu0 <wu.heng@zte.com.cn>
* test: remove skip-code of stacktrace on arm64
* add LR DWARF register and remove skip-code for fixed tests
* proc: fix the Continue command after the hardcoded breakpoint on arm64
Arm64 use hardware breakpoint, and it will not set PC to the next instruction like amd64. We should move PC in both runtime.breakpoints and hardcoded breakpoints(probably cgo).
* proc: implement cgo stacktrace on arm64
* proc: combine amd64_stack.go and arm64_stack.go file
* proc: reorganize the stacktrace code
* move SwitchStack function arch-related
* fix Continue command after manual stop on arm64
* add timeout flag to make.go to enable infinite timeouts
Co-authored-by: aarzilli <alessandro.arzilli@gmail.com>
Co-authored-by: hengwu0 <wu.heng@zte.com.cn>
Co-authored-by: tykcd996 <56993522+tykcd996@users.noreply.github.com>
Co-authored-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Due to a bug in the Go compiler midstack inlined calls do not report
their ranges correctly. We can't check if an address is in the range of
a DIE by simply looking at that DIE's range, we should also recursively
check the DIE's children's ranges.
Also fixes the way stacktraces of midstack inlined calls are reported
(they used to be inverted, with the deepest inlined stack frame
reported last).
Fixes#1795
Adds an API call that returns a list of packages contained in the
program and the files that were used to build them, and also a best
guess at which filesystem directory contained the package when it was
built.
This can be used by IDEs to map file paths if the debugging environment
doesn't match the build environment exactly.
Remove build tags from disassembler code, move architecture specific
functionality inside proc.Arch.
This is necessary because Delve should be able to debug corefiles
cross-platform.
* fix TestKill test:
It will fail in Open /proc/pid/ sporadicly since there is no any sync between signal sended(tracee handled) and open /proc/%d/, especially in some weak arm64 cpu. Skip /proc check on arm64.
* remove skip-code of Detach tests.
* proc/linux: do not route signals to threads while stopping
While we are trying to stop the process we should not route signals
sent to threads because that will result in threads being resumed.
Also keep better track of which threads are stopped.
This fixes an incompatibility with Go 1.14, which sends a lot of
signals to its threads to implement non-cooperative preemption,
resulting in Delve hanging waiting for an already-stopped thread to
stop.
In principle however this bug has nothing to do with Go 1.14 and could
manifest in any instance of high signal pressure.
* Makefile: discard stderr of "go list"
In module mode "go" will print messages about downloading modules to
stderr, we shouldn't confuse them for the real command output.
Modifies FindFileLocation, FindFunctionLocation and LineToPC as well as
service/debugger to support inlining and introduces the concept of
logical breakpoints.
For inlined functions FindFileLocation, FindFunctionLocation and
LineToPC will now return one PC address for each inlining and one PC
for the concrete implementation of the function (if present).
A proc.Breakpoint will continue to represent a physical breakpoint, at
a single memory location.
Breakpoints returned by service/debugger, however, will represent
logical breakpoints and may be associated with multiple memory
locations and, therefore, multiple proc.Breakpoints.
The necessary logic is introduced in service/debugger so that a change
to a logical breakpoint will be mirrored to all its physical
breakpoints and physical breakpoints are aggregated into a single
logical breakpoint when returned.
program
When evaluating type casts always resolve array types.
Instead of resolving them by looking up the string in debug_info
construct a fake array type so that a type cast to an array type always
works as long as the element type exists.
We already did this for byte arrays, this commit extends this to any
array type. The reason is that we return a fake array type (that
doesn't exist in the target program) for the array of a channel type.
Fixes#1736
Fixes a case of breakpoint confusion on resume caused by having two
breakpoints one byte apart. This bug can cause the target program to
resume execution a single byte inside an instruction and crash either
with SIGILL or a SIGSEGV, or misbehave (depending on how the truncated
instruction is decoded).
native.(*Thread).StepInstruction should call FindBreakpoint using
adjustPC==false because at that point the PC of the thread should
already have been adjusted (and it has been).
Adds a '-r' option to the 'restart' command (and to the Restart API)
that re-records the target when using rr.
Also moves the code to delete the trace directory inside the gdbserial
package.
Add options to start a stacktrace from the values saved in the
runtime.g struct as well as a way to disable the stackSwitch logic and
just get a normal stacktrace.
proc.Next and proc.Step will call, after setting their temp
breakpoints, curthread.SetCurrentBreakpoint. This is intended to find
if one of the newly created breakpoints happens to be at the same
instruction that curthread is stopped at.
However SetCurrentBreakpoint is intended to be called after a Continue
and StepInstruction operation so it will also detect if curthread is
stopped one byte after a breakpoint.
If the instruction immediately preceeding the current instruction of
curthread happens to:
1. have one of the newly created temp breakpoints
2. be one byte long
SetCurrentBreakpoint will believe that we just hit that breakpoint and
therefore the instruction should be repeated, and thus rewind the PC of
curthread by 1.
We should distinguish between the two uses of SetCurrentBreakpoint and
disable the check for "just hit" breakpoints when inappropriate.
Fixes#1656
* proc: fix stacktraces when a SIGSEGV happens during a cgo call
When a SIGSEGV happens in a cgo call (for example as a result of
dereferencing a NULL pointer) the stack layout will look like this:
(system stack) runtime.fatalthrow
(system stack) runtime.throw
(system stack) runtime.sigpanic
(system stack) offending C function
... other C functions...
(system stack) runtime.asmcgocall
(goroutine stack) call inside cgo
The code in switchStack would switch directly from the
runtime.fatalthrow frame to the first frame in the goroutine stack,
hiding important information.
Disable this switch for runtime.fatalthrow and reintroduce the check
for runtime.mstart that existed before this version of the code was
implemented in commit 7bec20.
This problem was reported in comment:
https://github.com/go-delve/delve/issues/935#issuecomment-512182533
* cmd/dlv: actually disable C compiler optimizations when building
* *: Add .cirrus.yml for FreeBSD testing
* *: run go mod tidy
* service/test: prefer 127.0.0.1 over localhost
* dwarf/line: fix TestDebugLinePrologueParser
* vendor: rerun go mod vendor
Increases the maximum string length from 64 to 1MB when loading strings
for a binary operator, also delays the loading until it's necessary.
This ensures that comparison between strings will always succeed in
reasonable situations.
Fixes#1615
Backports debug/dwarf commit: 535741a69a1300d1fe2800778b99c8a1b75d7fdd
CL: https://go-review.googlesource.com/18459
The x/debug/dwarf that we used for dwarf/godwarf/type.go was forked
from debug/dwarf long before this commit.
Original description:
Currently readType simultaneously constructs a type graph and resolves
the sizes of the types. However, these two operations are
fundamentally at odds: the order we parse a cyclic structure in may be
different than the order we need to resolve type sizes in. As a
result, it's possible that when readType attempts to resolve the size
of a typedef, it may dereference a nil Type field of another typedef
retrieved from the type cache that's only partially constructed.
To fix this, we delay resolving typedef sizes until the end of the
readType recursion, when the full type graph is constructed.
Fixes#1601
* proc: allow simultaneous call injection to multiple goroutines
Changes the call injection code so that we can have multiple call
injections going on at the same time as long as they happen on distinct
goroutines.
* proc: fix EvalExpressionWithCalls for constant expressions
The lack of address of constant expressions would confuse EvalExpressionWithCalls
Fixes#1577
* tests: fix tests for Go 1.13
- Go 1.13 doesn't autogenerate init functions anymore, tests that
expected that now fail and should be skipped.
- Plugin tests now need -gcflags'all=-N -l' now, we were probably
getting lucky with -gcflags='-N -l' before.
* proc: allow signed integers as shift counts
Go1.13 allows signed integers to be used as the right hand side of a
shift operator, change eval to match.
* goversion: update maximum supported version
* travis: force Go to use vendor directory
Travis scripts get confused by "go: downloading" lines, the exact
reason is not clear. Testing that the vendor directory is up to date is
a good idea anyway.
Support for bulk queries makes the DWARF quality checker
(github.com/dr2chase/dwarf-goodness/cmd/dwarf-goodness)
run much more efficiently (replace quadratic cost with
linear).
The location specified '<fnname>:0' could be used to set a breakpoint
on the entry point of the function (as opposed to locspec '<fnname>'
which sets it after the prologue).
Setting a breakpoint on an entry point is almost never useful, the way
this feature was implemented could cause it to be used accidentally and
there are other ways to accomplish the same task (by setting a
breakpoint on the PC address directly).
