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llvm-project/lldb/source/Target/StopInfo.cpp

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//===-- StopInfo.cpp --------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
#include <string>
// Other libraries and framework includes
// Project includes
#include "lldb/Target/StopInfo.h"
#include "lldb/Core/Log.h"
#include "lldb/Breakpoint/Breakpoint.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Breakpoint/Watchpoint.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Expression/UserExpression.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/UnixSignals.h"
using namespace lldb;
using namespace lldb_private;
StopInfo::StopInfo (Thread &thread, uint64_t value) :
m_thread_wp (thread.shared_from_this()),
m_stop_id (thread.GetProcess()->GetStopID()),
m_resume_id (thread.GetProcess()->GetResumeID()),
m_value (value),
m_description (),
m_override_should_notify (eLazyBoolCalculate),
m_override_should_stop (eLazyBoolCalculate),
m_extended_info()
{
}
bool
StopInfo::IsValid () const
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
return thread_sp->GetProcess()->GetStopID() == m_stop_id;
return false;
}
void
StopInfo::MakeStopInfoValid ()
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
m_stop_id = thread_sp->GetProcess()->GetStopID();
m_resume_id = thread_sp->GetProcess()->GetResumeID();
}
}
bool
StopInfo::HasTargetRunSinceMe ()
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
lldb::StateType ret_type = thread_sp->GetProcess()->GetPrivateState();
if (ret_type == eStateRunning)
{
return true;
}
else if (ret_type == eStateStopped)
{
// This is a little tricky. We want to count "run and stopped again before you could
// ask this question as a "TRUE" answer to HasTargetRunSinceMe. But we don't want to
// include any running of the target done for expressions. So we track both resumes,
// and resumes caused by expressions, and check if there are any resumes NOT caused
// by expressions.
uint32_t curr_resume_id = thread_sp->GetProcess()->GetResumeID();
uint32_t last_user_expression_id = thread_sp->GetProcess()->GetLastUserExpressionResumeID ();
if (curr_resume_id == m_resume_id)
{
return false;
}
else if (curr_resume_id > last_user_expression_id)
{
return true;
}
}
}
return false;
}
//----------------------------------------------------------------------
// StopInfoBreakpoint
//----------------------------------------------------------------------
namespace lldb_private
{
class StopInfoBreakpoint : public StopInfo
{
public:
StopInfoBreakpoint (Thread &thread, break_id_t break_id) :
StopInfo (thread, break_id),
m_should_stop (false),
m_should_stop_is_valid (false),
m_should_perform_action (true),
m_address (LLDB_INVALID_ADDRESS),
m_break_id(LLDB_INVALID_BREAK_ID),
m_was_one_shot (false)
{
StoreBPInfo();
}
StopInfoBreakpoint (Thread &thread, break_id_t break_id, bool should_stop) :
StopInfo (thread, break_id),
m_should_stop (should_stop),
m_should_stop_is_valid (true),
m_should_perform_action (true),
m_address (LLDB_INVALID_ADDRESS),
m_break_id(LLDB_INVALID_BREAK_ID),
m_was_one_shot (false)
{
StoreBPInfo();
}
~StopInfoBreakpoint() override = default;
void
StoreBPInfo ()
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value));
if (bp_site_sp)
{
if (bp_site_sp->GetNumberOfOwners() == 1)
{
BreakpointLocationSP bp_loc_sp = bp_site_sp->GetOwnerAtIndex(0);
if (bp_loc_sp)
{
m_break_id = bp_loc_sp->GetBreakpoint().GetID();
m_was_one_shot = bp_loc_sp->GetBreakpoint().IsOneShot();
}
}
m_address = bp_site_sp->GetLoadAddress();
}
}
}
bool
IsValidForOperatingSystemThread(Thread &thread) override
{
ProcessSP process_sp (thread.GetProcess());
if (process_sp)
{
BreakpointSiteSP bp_site_sp (process_sp->GetBreakpointSiteList().FindByID (m_value));
if (bp_site_sp)
return bp_site_sp->ValidForThisThread (&thread);
}
return false;
}
StopReason
GetStopReason() const override
{
return eStopReasonBreakpoint;
}
bool
ShouldStopSynchronous(Event *event_ptr) override
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
if (!m_should_stop_is_valid)
{
// Only check once if we should stop at a breakpoint
BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value));
if (bp_site_sp)
{
ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0));
StoppointCallbackContext context (event_ptr, exe_ctx, true);
bp_site_sp->BumpHitCounts();
m_should_stop = bp_site_sp->ShouldStop (&context);
}
else
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
if (log)
log->Printf ("Process::%s could not find breakpoint site id: %" PRId64 "...", __FUNCTION__, m_value);
m_should_stop = true;
}
m_should_stop_is_valid = true;
}
return m_should_stop;
}
return false;
}
bool
DoShouldNotify(Event *event_ptr) override
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value));
if (bp_site_sp)
{
bool all_internal = true;
for (uint32_t i = 0; i < bp_site_sp->GetNumberOfOwners(); i++)
{
if (!bp_site_sp->GetOwnerAtIndex(i)->GetBreakpoint().IsInternal())
{
all_internal = false;
break;
}
}
return !all_internal;
}
}
return true;
}
const char *
GetDescription() override
{
if (m_description.empty())
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value));
if (bp_site_sp)
{
StreamString strm;
// If we have just hit an internal breakpoint, and it has a kind description, print that instead of the
// full breakpoint printing:
if (bp_site_sp->IsInternal())
{
size_t num_owners = bp_site_sp->GetNumberOfOwners();
for (size_t idx = 0; idx < num_owners; idx++)
{
const char *kind = bp_site_sp->GetOwnerAtIndex(idx)->GetBreakpoint().GetBreakpointKind();
if (kind != nullptr)
{
m_description.assign (kind);
return kind;
}
}
}
strm.Printf("breakpoint ");
bp_site_sp->GetDescription(&strm, eDescriptionLevelBrief);
m_description.swap (strm.GetString());
}
else
{
StreamString strm;
if (m_break_id != LLDB_INVALID_BREAK_ID)
{
BreakpointSP break_sp = thread_sp->GetProcess()->GetTarget().GetBreakpointByID(m_break_id);
if (break_sp)
{
if (break_sp->IsInternal())
{
const char *kind = break_sp->GetBreakpointKind();
if (kind)
strm.Printf ("internal %s breakpoint(%d).", kind, m_break_id);
else
strm.Printf ("internal breakpoint(%d).", m_break_id);
}
else
{
strm.Printf ("breakpoint %d.", m_break_id);
}
}
else
{
if (m_was_one_shot)
strm.Printf ("one-shot breakpoint %d", m_break_id);
else
strm.Printf ("breakpoint %d which has been deleted.", m_break_id);
}
}
else if (m_address == LLDB_INVALID_ADDRESS)
strm.Printf("breakpoint site %" PRIi64 " which has been deleted - unknown address", m_value);
else
strm.Printf("breakpoint site %" PRIi64 " which has been deleted - was at 0x%" PRIx64, m_value, m_address);
m_description.swap (strm.GetString());
}
}
}
return m_description.c_str();
}
protected:
bool
ShouldStop(Event *event_ptr) override
{
// This just reports the work done by PerformAction or the synchronous stop. It should
// only ever get called after they have had a chance to run.
assert (m_should_stop_is_valid);
return m_should_stop;
}
void
PerformAction(Event *event_ptr) override
{
if (!m_should_perform_action)
return;
m_should_perform_action = false;
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
Log *log = lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_BREAKPOINTS | LIBLLDB_LOG_STEP);
if (!thread_sp->IsValid())
{
// This shouldn't ever happen, but just in case, don't do more harm.
if (log)
{
log->Printf ("PerformAction got called with an invalid thread.");
}
m_should_stop = true;
m_should_stop_is_valid = true;
return;
}
BreakpointSiteSP bp_site_sp (thread_sp->GetProcess()->GetBreakpointSiteList().FindByID (m_value));
std::unordered_set<break_id_t> precondition_breakpoints;
if (bp_site_sp)
{
// Let's copy the owners list out of the site and store them in a local list. That way if
// one of the breakpoint actions changes the site, then we won't be operating on a bad list.
BreakpointLocationCollection site_locations;
size_t num_owners = bp_site_sp->CopyOwnersList(site_locations);
if (num_owners == 0)
{
m_should_stop = true;
}
else
{
// We go through each location, and test first its precondition - this overrides everything. Note,
// we only do this once per breakpoint - not once per location...
// Then check the condition. If the condition says to stop,
// then we run the callback for that location. If that callback says to stop as well, then
// we set m_should_stop to true; we are going to stop.
// But we still want to give all the breakpoints whose conditions say we are going to stop a
// chance to run their callbacks.
// Of course if any callback restarts the target by putting "continue" in the callback, then
// we're going to restart, without running the rest of the callbacks. And in this case we will
// end up not stopping even if another location said we should stop. But that's better than not
// running all the callbacks.
m_should_stop = false;
// We don't select threads as we go through them testing breakpoint conditions and running commands.
// So we need to set the thread for expression evaluation here:
ThreadList::ExpressionExecutionThreadPusher thread_pusher(thread_sp);
ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0));
Process *process = exe_ctx.GetProcessPtr();
if (process->GetModIDRef().IsLastResumeForUserExpression())
{
// If we are in the middle of evaluating an expression, don't run asynchronous breakpoint commands or
// expressions. That could lead to infinite recursion if the command or condition re-calls the function
// with this breakpoint.
// TODO: We can keep a list of the breakpoints we've seen while running expressions in the nested
// PerformAction calls that can arise when the action runs a function that hits another breakpoint,
// and only stop running commands when we see the same breakpoint hit a second time.
m_should_stop_is_valid = true;
if (log)
log->Printf ("StopInfoBreakpoint::PerformAction - Hit a breakpoint while running an expression,"
" not running commands to avoid recursion.");
bool ignoring_breakpoints = process->GetIgnoreBreakpointsInExpressions();
if (ignoring_breakpoints)
{
m_should_stop = false;
// Internal breakpoints will always stop.
for (size_t j = 0; j < num_owners; j++)
{
lldb::BreakpointLocationSP bp_loc_sp = bp_site_sp->GetOwnerAtIndex(j);
if (bp_loc_sp->GetBreakpoint().IsInternal())
{
m_should_stop = true;
break;
}
}
}
else
{
m_should_stop = true;
}
if (log)
log->Printf ("StopInfoBreakpoint::PerformAction - in expression, continuing: %s.",
m_should_stop ? "true" : "false");
process->GetTarget().GetDebugger().GetAsyncOutputStream()->Printf("Warning: hit breakpoint while "
"running function, skipping commands and conditions to prevent recursion.");
return;
}
StoppointCallbackContext context (event_ptr, exe_ctx, false);
// For safety's sake let's also grab an extra reference to the breakpoint owners of the locations we're
// going to examine, since the locations are going to have to get back to their breakpoints, and the
// locations don't keep their owners alive. I'm just sticking the BreakpointSP's in a vector since
// I'm only using it to locally increment their retain counts.
std::vector<lldb::BreakpointSP> location_owners;
for (size_t j = 0; j < num_owners; j++)
{
BreakpointLocationSP loc(site_locations.GetByIndex(j));
location_owners.push_back(loc->GetBreakpoint().shared_from_this());
}
for (size_t j = 0; j < num_owners; j++)
{
lldb::BreakpointLocationSP bp_loc_sp = site_locations.GetByIndex(j);
// If another action disabled this breakpoint or its location, then don't run the actions.
if (!bp_loc_sp->IsEnabled() || !bp_loc_sp->GetBreakpoint().IsEnabled())
continue;
// The breakpoint site may have many locations associated with it, not all of them valid for
// this thread. Skip the ones that aren't:
if (!bp_loc_sp->ValidForThisThread(thread_sp.get()))
{
if (log)
{
StreamString s;
bp_loc_sp->GetDescription(&s, eDescriptionLevelBrief);
log->Printf ("Breakpoint %s hit on thread 0x%llx but it was not for this thread, continuing.",
s.GetData(),
static_cast<unsigned long long>(thread_sp->GetID()));
}
continue;
}
// First run the precondition, but since the precondition is per breakpoint, only run it once
// per breakpoint.
std::pair<std::unordered_set<break_id_t>::iterator, bool> result
= precondition_breakpoints.insert(bp_loc_sp->GetBreakpoint().GetID());
if (!result.second)
continue;
bool precondition_result = bp_loc_sp->GetBreakpoint().EvaluatePrecondition(context);
if (!precondition_result)
continue;
// Next run the condition for the breakpoint. If that says we should stop, then we'll run
// the callback for the breakpoint. If the callback says we shouldn't stop that will win.
if (bp_loc_sp->GetConditionText() != nullptr)
{
Error condition_error;
bool condition_says_stop = bp_loc_sp->ConditionSaysStop(exe_ctx, condition_error);
if (!condition_error.Success())
{
Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger();
StreamSP error_sp = debugger.GetAsyncErrorStream ();
error_sp->Printf ("Stopped due to an error evaluating condition of breakpoint ");
bp_loc_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief);
error_sp->Printf (": \"%s\"",
bp_loc_sp->GetConditionText());
error_sp->EOL();
const char *err_str = condition_error.AsCString("<Unknown Error>");
if (log)
log->Printf("Error evaluating condition: \"%s\"\n", err_str);
error_sp->PutCString (err_str);
error_sp->EOL();
error_sp->Flush();
}
else
{
if (log)
{
StreamString s;
bp_loc_sp->GetDescription(&s, eDescriptionLevelBrief);
log->Printf ("Condition evaluated for breakpoint %s on thread 0x%llx conditon_says_stop: %i.",
s.GetData(),
static_cast<unsigned long long>(thread_sp->GetID()),
condition_says_stop);
}
if (!condition_says_stop)
{
// We don't want to increment the hit count of breakpoints if the condition fails.
// We've already bumped it by the time we get here, so undo the bump:
bp_loc_sp->UndoBumpHitCount();
continue;
}
}
}
bool callback_says_stop;
// FIXME: For now the callbacks have to run in async mode - the first time we restart we need
// to get out of there. So set it here.
// When we figure out how to nest breakpoint hits then this will change.
Debugger &debugger = thread_sp->CalculateTarget()->GetDebugger();
bool old_async = debugger.GetAsyncExecution();
debugger.SetAsyncExecution (true);
callback_says_stop = bp_loc_sp->InvokeCallback (&context);
debugger.SetAsyncExecution (old_async);
if (callback_says_stop)
m_should_stop = true;
// If we are going to stop for this breakpoint, then remove the breakpoint.
if (callback_says_stop && bp_loc_sp && bp_loc_sp->GetBreakpoint().IsOneShot())
{
thread_sp->GetProcess()->GetTarget().RemoveBreakpointByID (bp_loc_sp->GetBreakpoint().GetID());
}
// Also make sure that the callback hasn't continued the target.
// If it did, when we'll set m_should_start to false and get out of here.
if (HasTargetRunSinceMe ())
{
m_should_stop = false;
break;
}
}
}
// We've figured out what this stop wants to do, so mark it as valid so we don't compute it again.
m_should_stop_is_valid = true;
}
else
{
m_should_stop = true;
m_should_stop_is_valid = true;
Log * log_process(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
if (log_process)
log_process->Printf ("Process::%s could not find breakpoint site id: %" PRId64 "...", __FUNCTION__, m_value);
}
if (log)
log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop);
}
}
private:
bool m_should_stop;
bool m_should_stop_is_valid;
bool m_should_perform_action; // Since we are trying to preserve the "state" of the system even if we run functions
// etc. behind the users backs, we need to make sure we only REALLY perform the action once.
lldb::addr_t m_address; // We use this to capture the breakpoint site address when we create the StopInfo,
// in case somebody deletes it between the time the StopInfo is made and the
// description is asked for.
lldb::break_id_t m_break_id;
bool m_was_one_shot;
};
//----------------------------------------------------------------------
// StopInfoWatchpoint
//----------------------------------------------------------------------
class StopInfoWatchpoint : public StopInfo
{
public:
// Make sure watchpoint is properly disabled and subsequently enabled while performing watchpoint actions.
class WatchpointSentry {
public:
WatchpointSentry(Process *p, Watchpoint *w):
process(p),
watchpoint(w)
{
if (process && watchpoint)
{
const bool notify = false;
watchpoint->TurnOnEphemeralMode();
process->DisableWatchpoint(watchpoint, notify);
}
}
~WatchpointSentry()
{
if (process && watchpoint)
{
if (!watchpoint->IsDisabledDuringEphemeralMode())
{
const bool notify = false;
process->EnableWatchpoint(watchpoint, notify);
}
watchpoint->TurnOffEphemeralMode();
}
}
private:
Process *process;
Watchpoint *watchpoint;
};
StopInfoWatchpoint (Thread &thread, break_id_t watch_id, lldb::addr_t watch_hit_addr) :
StopInfo(thread, watch_id),
m_should_stop(false),
m_should_stop_is_valid(false),
m_watch_hit_addr(watch_hit_addr)
{
}
~StopInfoWatchpoint() override = default;
StopReason
GetStopReason() const override
{
return eStopReasonWatchpoint;
}
const char *
GetDescription() override
{
if (m_description.empty())
{
StreamString strm;
strm.Printf("watchpoint %" PRIi64, m_value);
m_description.swap (strm.GetString());
}
return m_description.c_str();
}
protected:
bool
ShouldStopSynchronous(Event *event_ptr) override
{
// ShouldStop() method is idempotent and should not affect hit count.
// See Process::RunPrivateStateThread()->Process()->HandlePrivateEvent()
// -->Process()::ShouldBroadcastEvent()->ThreadList::ShouldStop()->
// Thread::ShouldStop()->ThreadPlanBase::ShouldStop()->
// StopInfoWatchpoint::ShouldStop() and
// Event::DoOnRemoval()->Process::ProcessEventData::DoOnRemoval()->
// StopInfoWatchpoint::PerformAction().
if (m_should_stop_is_valid)
return m_should_stop;
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
WatchpointSP wp_sp (thread_sp->CalculateTarget()->GetWatchpointList().FindByID(GetValue()));
if (wp_sp)
{
// Check if we should stop at a watchpoint.
ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0));
StoppointCallbackContext context (event_ptr, exe_ctx, true);
m_should_stop = wp_sp->ShouldStop (&context);
}
else
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
if (log)
log->Printf ("Process::%s could not find watchpoint location id: %" PRId64 "...",
__FUNCTION__, GetValue());
m_should_stop = true;
}
}
m_should_stop_is_valid = true;
return m_should_stop;
}
bool
ShouldStop(Event *event_ptr) override
{
// This just reports the work done by PerformAction or the synchronous stop. It should
// only ever get called after they have had a chance to run.
assert (m_should_stop_is_valid);
return m_should_stop;
}
void
PerformAction(Event *event_ptr) override
{
Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_WATCHPOINTS);
// We're going to calculate if we should stop or not in some way during the course of
// this code. Also by default we're going to stop, so set that here.
m_should_stop = true;
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
WatchpointSP wp_sp (thread_sp->CalculateTarget()->GetWatchpointList().FindByID(GetValue()));
if (wp_sp)
{
ExecutionContext exe_ctx (thread_sp->GetStackFrameAtIndex(0));
Process* process = exe_ctx.GetProcessPtr();
// This sentry object makes sure the current watchpoint is disabled while performing watchpoint actions,
// and it is then enabled after we are finished.
WatchpointSentry sentry(process, wp_sp.get());
{
// check if this process is running on an architecture where watchpoints trigger
// before the associated instruction runs. if so, disable the WP, single-step and then
// re-enable the watchpoint
if (process)
{
uint32_t num;
bool wp_triggers_after;
if (process->GetWatchpointSupportInfo(num, wp_triggers_after).Success())
{
if (!wp_triggers_after)
{
StopInfoSP stored_stop_info_sp = thread_sp->GetStopInfo();
assert (stored_stop_info_sp.get() == this);
ThreadPlanSP new_plan_sp(thread_sp->QueueThreadPlanForStepSingleInstruction(false, // step-over
false, // abort_other_plans
true)); // stop_other_threads
new_plan_sp->SetIsMasterPlan (true);
new_plan_sp->SetOkayToDiscard (false);
new_plan_sp->SetPrivate (true);
process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID());
process->ResumeSynchronous(nullptr);
process->GetThreadList().SetSelectedThreadByID (thread_sp->GetID());
thread_sp->SetStopInfo(stored_stop_info_sp);
}
}
}
}
/*
* MIPS: Last 3bits of the watchpoint address are masked by the kernel. For example:
* 'n' is at 0x120010d00 and 'm' is 0x120010d04. When a watchpoint is set at 'm', then
* watch exception is generated even when 'n' is read/written. To handle this case,
* server emulates the instruction at PC and finds the base address of the load/store
* instruction and appends it in the description of the stop-info packet. If watchpoint
* is not set on this address by user then this do not stop.
*/
if (m_watch_hit_addr != LLDB_INVALID_ADDRESS)
{
WatchpointSP wp_hit_sp = thread_sp->CalculateTarget()->GetWatchpointList().FindByAddress(m_watch_hit_addr);
if (!wp_hit_sp)
{
m_should_stop = false;
wp_sp->IncrementFalseAlarmsAndReviseHitCount();
}
}
// TODO: This condition should be checked in the synchronous part of the watchpoint code
// (Watchpoint::ShouldStop), so that we avoid pulling an event even if the watchpoint fails
// the ignore count condition. It is moved here temporarily, because for archs with
// watchpoint_exceptions_received=before, the code in the previous lines takes care of moving
// the inferior to next PC. We have to check the ignore count condition after this is done,
// otherwise we will hit same watchpoint multiple times until we pass ignore condition, but we
// won't actually be ignoring them.
if (wp_sp->GetHitCount() <= wp_sp->GetIgnoreCount())
m_should_stop = false;
if (m_should_stop && wp_sp->GetConditionText() != nullptr)
{
// We need to make sure the user sees any parse errors in their condition, so we'll hook the
// constructor errors up to the debugger's Async I/O.
ExpressionResults result_code;
EvaluateExpressionOptions expr_options;
expr_options.SetUnwindOnError(true);
expr_options.SetIgnoreBreakpoints(true);
ValueObjectSP result_value_sp;
Error error;
result_code = UserExpression::Evaluate(exe_ctx,
expr_options,
wp_sp->GetConditionText(),
nullptr,
result_value_sp,
error);
if (result_code == eExpressionCompleted)
{
if (result_value_sp)
{
Scalar scalar_value;
if (result_value_sp->ResolveValue (scalar_value))
{
if (scalar_value.ULongLong(1) == 0)
{
// We have been vetoed. This takes precedence over querying
// the watchpoint whether it should stop (aka ignore count and
// friends). See also StopInfoWatchpoint::ShouldStop() as well
// as Process::ProcessEventData::DoOnRemoval().
m_should_stop = false;
}
else
m_should_stop = true;
if (log)
log->Printf("Condition successfully evaluated, result is %s.\n",
m_should_stop ? "true" : "false");
}
else
{
m_should_stop = true;
if (log)
log->Printf("Failed to get an integer result from the expression.");
}
}
}
else
{
Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger();
StreamSP error_sp = debugger.GetAsyncErrorStream ();
error_sp->Printf ("Stopped due to an error evaluating condition of watchpoint ");
wp_sp->GetDescription (error_sp.get(), eDescriptionLevelBrief);
error_sp->Printf (": \"%s\"",
wp_sp->GetConditionText());
error_sp->EOL();
const char *err_str = error.AsCString("<Unknown Error>");
if (log)
log->Printf("Error evaluating condition: \"%s\"\n", err_str);
error_sp->PutCString (err_str);
error_sp->EOL();
error_sp->Flush();
// If the condition fails to be parsed or run, we should stop.
m_should_stop = true;
}
}
// If the condition says to stop, we run the callback to further decide whether to stop.
if (m_should_stop)
{
StoppointCallbackContext context (event_ptr, exe_ctx, false);
bool stop_requested = wp_sp->InvokeCallback (&context);
// Also make sure that the callback hasn't continued the target.
// If it did, when we'll set m_should_stop to false and get out of here.
if (HasTargetRunSinceMe ())
m_should_stop = false;
if (m_should_stop && !stop_requested)
{
// We have been vetoed by the callback mechanism.
m_should_stop = false;
}
}
// Finally, if we are going to stop, print out the new & old values:
if (m_should_stop)
{
wp_sp->CaptureWatchedValue(exe_ctx);
Debugger &debugger = exe_ctx.GetTargetRef().GetDebugger();
StreamSP output_sp = debugger.GetAsyncOutputStream ();
wp_sp->DumpSnapshots(output_sp.get());
output_sp->EOL();
output_sp->Flush();
}
}
else
{
Log * log_process(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
if (log_process)
log_process->Printf ("Process::%s could not find watchpoint id: %" PRId64 "...", __FUNCTION__, m_value);
}
if (log)
log->Printf ("Process::%s returning from action with m_should_stop: %d.", __FUNCTION__, m_should_stop);
m_should_stop_is_valid = true;
}
}
private:
bool m_should_stop;
bool m_should_stop_is_valid;
lldb::addr_t m_watch_hit_addr;
};
//----------------------------------------------------------------------
// StopInfoUnixSignal
//----------------------------------------------------------------------
class StopInfoUnixSignal : public StopInfo
{
public:
StopInfoUnixSignal (Thread &thread, int signo, const char *description) :
StopInfo (thread, signo)
{
SetDescription (description);
}
~StopInfoUnixSignal() override = default;
StopReason
GetStopReason() const override
{
return eStopReasonSignal;
}
bool
ShouldStopSynchronous(Event *event_ptr) override
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
return thread_sp->GetProcess()->GetUnixSignals()->GetShouldStop(m_value);
return false;
}
bool
ShouldStop(Event *event_ptr) override
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
return thread_sp->GetProcess()->GetUnixSignals()->GetShouldStop(m_value);
return false;
}
// If should stop returns false, check if we should notify of this event
bool
DoShouldNotify(Event *event_ptr) override
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
bool should_notify = thread_sp->GetProcess()->GetUnixSignals()->GetShouldNotify(m_value);
if (should_notify)
{
StreamString strm;
strm.Printf ("thread %d received signal: %s",
thread_sp->GetIndexID(),
thread_sp->GetProcess()->GetUnixSignals()->GetSignalAsCString(m_value));
Process::ProcessEventData::AddRestartedReason(event_ptr, strm.GetData());
}
return should_notify;
}
return true;
}
void
WillResume(lldb::StateType resume_state) override
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
if (!thread_sp->GetProcess()->GetUnixSignals()->GetShouldSuppress(m_value))
thread_sp->SetResumeSignal(m_value);
}
}
const char *
GetDescription() override
{
if (m_description.empty())
{
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
{
StreamString strm;
const char *signal_name = thread_sp->GetProcess()->GetUnixSignals()->GetSignalAsCString(m_value);
if (signal_name)
strm.Printf("signal %s", signal_name);
else
strm.Printf("signal %" PRIi64, m_value);
m_description.swap (strm.GetString());
}
}
return m_description.c_str();
}
};
//----------------------------------------------------------------------
// StopInfoTrace
//----------------------------------------------------------------------
class StopInfoTrace : public StopInfo
{
public:
StopInfoTrace (Thread &thread) :
StopInfo (thread, LLDB_INVALID_UID)
{
}
~StopInfoTrace() override = default;
StopReason
GetStopReason() const override
{
return eStopReasonTrace;
}
const char *
GetDescription() override
{
if (m_description.empty())
return "trace";
else
return m_description.c_str();
}
};
//----------------------------------------------------------------------
// StopInfoException
//----------------------------------------------------------------------
class StopInfoException : public StopInfo
{
public:
StopInfoException (Thread &thread, const char *description) :
StopInfo (thread, LLDB_INVALID_UID)
{
if (description)
SetDescription (description);
}
~StopInfoException() override = default;
StopReason
GetStopReason() const override
{
return eStopReasonException;
}
const char *
GetDescription() override
{
if (m_description.empty())
return "exception";
else
return m_description.c_str();
}
};
//----------------------------------------------------------------------
// StopInfoThreadPlan
//----------------------------------------------------------------------
class StopInfoThreadPlan : public StopInfo
{
public:
StopInfoThreadPlan (ThreadPlanSP &plan_sp, ValueObjectSP &return_valobj_sp, ExpressionVariableSP &expression_variable_sp) :
StopInfo (plan_sp->GetThread(), LLDB_INVALID_UID),
m_plan_sp (plan_sp),
m_return_valobj_sp (return_valobj_sp),
m_expression_variable_sp (expression_variable_sp)
{
}
~StopInfoThreadPlan() override = default;
StopReason
GetStopReason() const override
{
return eStopReasonPlanComplete;
}
const char *
GetDescription() override
{
if (m_description.empty())
{
StreamString strm;
m_plan_sp->GetDescription (&strm, eDescriptionLevelBrief);
m_description.swap (strm.GetString());
}
return m_description.c_str();
}
ValueObjectSP
GetReturnValueObject()
{
return m_return_valobj_sp;
}
ExpressionVariableSP
GetExpressionVariable()
{
return m_expression_variable_sp;
}
protected:
bool
ShouldStop(Event *event_ptr) override
{
if (m_plan_sp)
return m_plan_sp->ShouldStop(event_ptr);
else
return StopInfo::ShouldStop(event_ptr);
}
private:
ThreadPlanSP m_plan_sp;
ValueObjectSP m_return_valobj_sp;
ExpressionVariableSP m_expression_variable_sp;
};
class StopInfoExec : public StopInfo
{
public:
StopInfoExec (Thread &thread) :
StopInfo (thread, LLDB_INVALID_UID),
m_performed_action (false)
{
}
~StopInfoExec() override = default;
StopReason
GetStopReason() const override
{
return eStopReasonExec;
}
const char *
GetDescription() override
{
return "exec";
}
protected:
void
PerformAction(Event *event_ptr) override
{
// Only perform the action once
if (m_performed_action)
return;
m_performed_action = true;
ThreadSP thread_sp (m_thread_wp.lock());
if (thread_sp)
thread_sp->GetProcess()->DidExec();
}
bool m_performed_action;
};
} // namespace lldb_private
StopInfoSP
StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id)
{
return StopInfoSP (new StopInfoBreakpoint (thread, break_id));
}
StopInfoSP
StopInfo::CreateStopReasonWithBreakpointSiteID (Thread &thread, break_id_t break_id, bool should_stop)
{
return StopInfoSP (new StopInfoBreakpoint (thread, break_id, should_stop));
}
StopInfoSP
StopInfo::CreateStopReasonWithWatchpointID (Thread &thread, break_id_t watch_id, lldb::addr_t watch_hit_addr)
{
return StopInfoSP (new StopInfoWatchpoint (thread, watch_id, watch_hit_addr));
}
StopInfoSP
StopInfo::CreateStopReasonWithSignal (Thread &thread, int signo, const char *description)
{
return StopInfoSP (new StopInfoUnixSignal (thread, signo, description));
}
StopInfoSP
StopInfo::CreateStopReasonToTrace (Thread &thread)
{
return StopInfoSP (new StopInfoTrace (thread));
}
StopInfoSP
StopInfo::CreateStopReasonWithPlan (ThreadPlanSP &plan_sp,
ValueObjectSP return_valobj_sp,
ExpressionVariableSP expression_variable_sp)
{
return StopInfoSP (new StopInfoThreadPlan (plan_sp, return_valobj_sp, expression_variable_sp));
}
StopInfoSP
StopInfo::CreateStopReasonWithException (Thread &thread, const char *description)
{
return StopInfoSP (new StopInfoException (thread, description));
}
StopInfoSP
StopInfo::CreateStopReasonWithExec (Thread &thread)
{
return StopInfoSP (new StopInfoExec (thread));
}
ValueObjectSP
StopInfo::GetReturnValueObject(StopInfoSP &stop_info_sp)
{
if (stop_info_sp && stop_info_sp->GetStopReason() == eStopReasonPlanComplete)
{
StopInfoThreadPlan *plan_stop_info = static_cast<StopInfoThreadPlan *>(stop_info_sp.get());
return plan_stop_info->GetReturnValueObject();
}
else
return ValueObjectSP();
}
ExpressionVariableSP
StopInfo::GetExpressionVariable(StopInfoSP &stop_info_sp)
{
if (stop_info_sp && stop_info_sp->GetStopReason() == eStopReasonPlanComplete)
{
StopInfoThreadPlan *plan_stop_info = static_cast<StopInfoThreadPlan *>(stop_info_sp.get());
return plan_stop_info->GetExpressionVariable();
}
else
return ExpressionVariableSP();
}
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