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

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//===-- ThreadPlanCallFunction.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
// Other libraries and framework includes
// Project includes
#include "lldb/Target/ThreadPlanCallFunction.h"
#include "lldb/Breakpoint/Breakpoint.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Core/Address.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Stream.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/ABI.h"
#include "lldb/Target/LanguageRuntime.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/StopInfo.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlanRunToAddress.h"
using namespace lldb;
using namespace lldb_private;
//----------------------------------------------------------------------
// ThreadPlanCallFunction: Plan to call a single function
//----------------------------------------------------------------------
bool
ThreadPlanCallFunction::ConstructorSetup (Thread &thread,
ABI *& abi,
lldb::addr_t &start_load_addr,
lldb::addr_t &function_load_addr)
{
SetIsMasterPlan (true);
SetOkayToDiscard (false);
SetPrivate (true);
ProcessSP process_sp (thread.GetProcess());
if (!process_sp)
return false;
abi = process_sp->GetABI().get();
if (!abi)
return false;
Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_STEP));
SetBreakpoints();
m_function_sp = thread.GetRegisterContext()->GetSP() - abi->GetRedZoneSize();
// If we can't read memory at the point of the process where we are planning to put our function, we're
// not going to get any further...
Error error;
process_sp->ReadUnsignedIntegerFromMemory(m_function_sp, 4, 0, error);
if (!error.Success())
{
m_constructor_errors.Printf ("Trying to put the stack in unreadable memory at: 0x%" PRIx64 ".", m_function_sp);
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
Module *exe_module = GetTarget().GetExecutableModulePointer();
if (exe_module == nullptr)
{
m_constructor_errors.Printf ("Can't execute code without an executable module.");
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
else
{
ObjectFile *objectFile = exe_module->GetObjectFile();
if (!objectFile)
{
m_constructor_errors.Printf ("Could not find object file for module \"%s\".",
exe_module->GetFileSpec().GetFilename().AsCString());
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
m_start_addr = objectFile->GetEntryPointAddress();
if (!m_start_addr.IsValid())
{
m_constructor_errors.Printf ("Could not find entry point address for executable module \"%s\".",
exe_module->GetFileSpec().GetFilename().AsCString());
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
}
start_load_addr = m_start_addr.GetLoadAddress (&GetTarget());
// Checkpoint the thread state so we can restore it later.
if (log && log->GetVerbose())
ReportRegisterState ("About to checkpoint thread before function call. Original register state was:");
if (!thread.CheckpointThreadState (m_stored_thread_state))
{
m_constructor_errors.Printf ("Setting up ThreadPlanCallFunction, failed to checkpoint thread state.");
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
function_load_addr = m_function_addr.GetLoadAddress (&GetTarget());
return true;
}
ThreadPlanCallFunction::ThreadPlanCallFunction (Thread &thread,
const Address &function,
const CompilerType &return_type,
llvm::ArrayRef<addr_t> args,
const EvaluateExpressionOptions &options) :
ThreadPlan (ThreadPlan::eKindCallFunction, "Call function plan", thread, eVoteNoOpinion, eVoteNoOpinion),
m_valid (false),
m_stop_other_threads (options.GetStopOthers()),
m_unwind_on_error (options.DoesUnwindOnError()),
m_ignore_breakpoints (options.DoesIgnoreBreakpoints()),
m_debug_execution (options.GetDebug()),
m_trap_exceptions (options.GetTrapExceptions()),
m_function_addr (function),
m_function_sp (0),
m_takedown_done (false),
m_should_clear_objc_exception_bp(false),
m_should_clear_cxx_exception_bp (false),
m_stop_address (LLDB_INVALID_ADDRESS),
m_return_type (return_type)
{
lldb::addr_t start_load_addr = LLDB_INVALID_ADDRESS;
lldb::addr_t function_load_addr = LLDB_INVALID_ADDRESS;
ABI *abi = nullptr;
if (!ConstructorSetup (thread, abi, start_load_addr, function_load_addr))
return;
if (!abi->PrepareTrivialCall(thread,
m_function_sp,
function_load_addr,
start_load_addr,
args))
return;
ReportRegisterState ("Function call was set up. Register state was:");
m_valid = true;
}
ThreadPlanCallFunction::ThreadPlanCallFunction(Thread &thread,
const Address &function,
const EvaluateExpressionOptions &options) :
ThreadPlan(ThreadPlan::eKindCallFunction, "Call function plan", thread, eVoteNoOpinion, eVoteNoOpinion),
m_valid(false),
m_stop_other_threads(options.GetStopOthers()),
m_unwind_on_error(options.DoesUnwindOnError()),
m_ignore_breakpoints(options.DoesIgnoreBreakpoints()),
m_debug_execution(options.GetDebug()),
m_trap_exceptions(options.GetTrapExceptions()),
m_function_addr(function),
m_function_sp(0),
m_takedown_done(false),
m_should_clear_objc_exception_bp(false),
m_should_clear_cxx_exception_bp(false),
m_stop_address(LLDB_INVALID_ADDRESS),
m_return_type(CompilerType())
{
}
ThreadPlanCallFunction::~ThreadPlanCallFunction ()
{
DoTakedown(PlanSucceeded());
}
void
ThreadPlanCallFunction::ReportRegisterState (const char *message)
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP | LIBLLDB_LOG_VERBOSE));
if (log)
{
StreamString strm;
RegisterContext *reg_ctx = m_thread.GetRegisterContext().get();
log->PutCString(message);
RegisterValue reg_value;
for (uint32_t reg_idx = 0, num_registers = reg_ctx->GetRegisterCount();
reg_idx < num_registers;
++reg_idx)
{
const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoAtIndex (reg_idx);
if (reg_ctx->ReadRegister(reg_info, reg_value))
{
reg_value.Dump(&strm, reg_info, true, false, eFormatDefault);
strm.EOL();
}
}
log->PutCString(strm.GetData());
}
}
void
ThreadPlanCallFunction::DoTakedown (bool success)
{
Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_STEP));
if (!m_valid)
{
//Don't call DoTakedown if we were never valid to begin with.
if (log)
log->Printf ("ThreadPlanCallFunction(%p): Log called on ThreadPlanCallFunction that was never valid.",
static_cast<void*>(this));
return;
}
if (!m_takedown_done)
{
if (success)
{
SetReturnValue();
}
if (log)
log->Printf ("ThreadPlanCallFunction(%p): DoTakedown called for thread 0x%4.4" PRIx64 ", m_valid: %d complete: %d.\n",
static_cast<void*>(this), m_thread.GetID(), m_valid,
IsPlanComplete());
m_takedown_done = true;
m_stop_address = m_thread.GetStackFrameAtIndex(0)->GetRegisterContext()->GetPC();
m_real_stop_info_sp = GetPrivateStopInfo ();
if (!m_thread.RestoreRegisterStateFromCheckpoint(m_stored_thread_state))
{
if (log)
log->Printf("ThreadPlanCallFunction(%p): DoTakedown failed to restore register state",
static_cast<void*>(this));
}
SetPlanComplete(success);
ClearBreakpoints();
if (log && log->GetVerbose())
ReportRegisterState ("Restoring thread state after function call. Restored register state:");
}
else
{
if (log)
log->Printf ("ThreadPlanCallFunction(%p): DoTakedown called as no-op for thread 0x%4.4" PRIx64 ", m_valid: %d complete: %d.\n",
static_cast<void*>(this), m_thread.GetID(), m_valid,
IsPlanComplete());
}
}
void
ThreadPlanCallFunction::WillPop ()
{
DoTakedown(PlanSucceeded());
}
void
ThreadPlanCallFunction::GetDescription (Stream *s, DescriptionLevel level)
{
if (level == eDescriptionLevelBrief)
{
s->Printf("Function call thread plan");
}
else
{
TargetSP target_sp (m_thread.CalculateTarget());
s->Printf("Thread plan to call 0x%" PRIx64, m_function_addr.GetLoadAddress(target_sp.get()));
}
}
bool
ThreadPlanCallFunction::ValidatePlan (Stream *error)
{
if (!m_valid)
{
if (error)
{
if (m_constructor_errors.GetSize() > 0)
error->PutCString (m_constructor_errors.GetData());
else
error->PutCString ("Unknown error");
}
return false;
}
return true;
}
Vote
ThreadPlanCallFunction::ShouldReportStop(Event *event_ptr)
{
if (m_takedown_done || IsPlanComplete())
return eVoteYes;
else
return ThreadPlan::ShouldReportStop(event_ptr);
}
bool
ThreadPlanCallFunction::DoPlanExplainsStop (Event *event_ptr)
{
Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_STEP|LIBLLDB_LOG_PROCESS));
m_real_stop_info_sp = GetPrivateStopInfo ();
// If our subplan knows why we stopped, even if it's done (which would forward the question to us)
// we answer yes.
if (m_subplan_sp && m_subplan_sp->PlanExplainsStop(event_ptr))
{
SetPlanComplete();
return true;
}
// Check if the breakpoint is one of ours.
StopReason stop_reason;
if (!m_real_stop_info_sp)
stop_reason = eStopReasonNone;
else
stop_reason = m_real_stop_info_sp->GetStopReason();
if (log)
log->Printf ("ThreadPlanCallFunction::PlanExplainsStop: Got stop reason - %s.", Thread::StopReasonAsCString(stop_reason));
if (stop_reason == eStopReasonBreakpoint && BreakpointsExplainStop())
return true;
// One more quirk here. If this event was from Halt interrupting the target, then we should not consider
// ourselves complete. Return true to acknowledge the stop.
if (Process::ProcessEventData::GetInterruptedFromEvent(event_ptr))
{
if (log)
log->Printf ("ThreadPlanCallFunction::PlanExplainsStop: The event is an Interrupt, returning true.");
return true;
}
// We control breakpoints separately from other "stop reasons." So first,
// check the case where we stopped for an internal breakpoint, in that case, continue on.
// If it is not an internal breakpoint, consult m_ignore_breakpoints.
if (stop_reason == eStopReasonBreakpoint)
{
ProcessSP process_sp (m_thread.CalculateProcess());
uint64_t break_site_id = m_real_stop_info_sp->GetValue();
BreakpointSiteSP bp_site_sp;
if (process_sp)
bp_site_sp = process_sp->GetBreakpointSiteList().FindByID(break_site_id);
if (bp_site_sp)
{
uint32_t num_owners = bp_site_sp->GetNumberOfOwners();
bool is_internal = true;
for (uint32_t i = 0; i < num_owners; i++)
{
Breakpoint &bp = bp_site_sp->GetOwnerAtIndex(i)->GetBreakpoint();
if (log)
log->Printf ("ThreadPlanCallFunction::PlanExplainsStop: hit breakpoint %d while calling function", bp.GetID());
if (!bp.IsInternal())
{
is_internal = false;
break;
}
}
if (is_internal)
{
if (log)
log->Printf ("ThreadPlanCallFunction::PlanExplainsStop hit an internal breakpoint, not stopping.");
return false;
}
}
if (m_ignore_breakpoints)
{
if (log)
log->Printf("ThreadPlanCallFunction::PlanExplainsStop: we are ignoring breakpoints, overriding breakpoint stop info ShouldStop, returning true");
m_real_stop_info_sp->OverrideShouldStop(false);
return true;
}
else
{
if (log)
log->Printf("ThreadPlanCallFunction::PlanExplainsStop: we are not ignoring breakpoints, overriding breakpoint stop info ShouldStop, returning true");
m_real_stop_info_sp->OverrideShouldStop(true);
return false;
}
}
else if (!m_unwind_on_error)
{
// If we don't want to discard this plan, than any stop we don't understand should be propagated up the stack.
return false;
}
else
{
// If the subplan is running, any crashes are attributable to us.
// If we want to discard the plan, then we say we explain the stop
// but if we are going to be discarded, let whoever is above us
// explain the stop.
// But don't discard the plan if the stop would restart itself (for instance if it is a
// signal that is set not to stop. Check that here first. We just say we explain the stop
// but aren't done and everything will continue on from there.
if (m_real_stop_info_sp && m_real_stop_info_sp->ShouldStopSynchronous(event_ptr))
{
SetPlanComplete(false);
return m_subplan_sp ? m_unwind_on_error : false;
}
else
return true;
}
}
bool
ThreadPlanCallFunction::ShouldStop (Event *event_ptr)
{
// We do some computation in DoPlanExplainsStop that may or may not set the plan as complete.
// We need to do that here to make sure our state is correct.
DoPlanExplainsStop(event_ptr);
if (IsPlanComplete())
{
ReportRegisterState ("Function completed. Register state was:");
return true;
}
else
{
return false;
}
}
bool
ThreadPlanCallFunction::StopOthers ()
{
return m_stop_other_threads;
}
StateType
ThreadPlanCallFunction::GetPlanRunState ()
{
return eStateRunning;
}
void
ThreadPlanCallFunction::DidPush ()
{
//#define SINGLE_STEP_EXPRESSIONS
// Now set the thread state to "no reason" so we don't run with whatever signal was outstanding...
// Wait till the plan is pushed so we aren't changing the stop info till we're about to run.
GetThread().SetStopInfoToNothing();
#ifndef SINGLE_STEP_EXPRESSIONS
m_subplan_sp.reset(new ThreadPlanRunToAddress(m_thread, m_start_addr, m_stop_other_threads));
m_thread.QueueThreadPlan(m_subplan_sp, false);
m_subplan_sp->SetPrivate (true);
#endif
}
bool
ThreadPlanCallFunction::WillStop ()
{
return true;
}
bool
ThreadPlanCallFunction::MischiefManaged ()
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
if (IsPlanComplete())
{
if (log)
log->Printf("ThreadPlanCallFunction(%p): Completed call function plan.",
static_cast<void*>(this));
ThreadPlan::MischiefManaged ();
return true;
}
else
{
return false;
}
}
void
ThreadPlanCallFunction::SetBreakpoints ()
{
ProcessSP process_sp (m_thread.CalculateProcess());
if (m_trap_exceptions && process_sp)
{
m_cxx_language_runtime = process_sp->GetLanguageRuntime(eLanguageTypeC_plus_plus);
m_objc_language_runtime = process_sp->GetLanguageRuntime(eLanguageTypeObjC);
if (m_cxx_language_runtime)
{
m_should_clear_cxx_exception_bp = !m_cxx_language_runtime->ExceptionBreakpointsAreSet();
m_cxx_language_runtime->SetExceptionBreakpoints();
}
if (m_objc_language_runtime)
{
m_should_clear_objc_exception_bp = !m_objc_language_runtime->ExceptionBreakpointsAreSet();
m_objc_language_runtime->SetExceptionBreakpoints();
}
}
}
void
ThreadPlanCallFunction::ClearBreakpoints ()
{
if (m_trap_exceptions)
{
if (m_cxx_language_runtime && m_should_clear_cxx_exception_bp)
m_cxx_language_runtime->ClearExceptionBreakpoints();
if (m_objc_language_runtime && m_should_clear_objc_exception_bp)
m_objc_language_runtime->ClearExceptionBreakpoints();
}
}
bool
ThreadPlanCallFunction::BreakpointsExplainStop()
{
StopInfoSP stop_info_sp = GetPrivateStopInfo ();
if (m_trap_exceptions)
{
if ((m_cxx_language_runtime &&
m_cxx_language_runtime->ExceptionBreakpointsExplainStop(stop_info_sp))
||(m_objc_language_runtime &&
m_objc_language_runtime->ExceptionBreakpointsExplainStop(stop_info_sp)))
{
Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_STEP));
if (log)
log->Printf ("ThreadPlanCallFunction::BreakpointsExplainStop - Hit an exception breakpoint, setting plan complete.");
SetPlanComplete(false);
// If the user has set the ObjC language breakpoint, it would normally get priority over our internal
// catcher breakpoint, but in this case we can't let that happen, so force the ShouldStop here.
stop_info_sp->OverrideShouldStop (true);
return true;
}
}
return false;
}
void
ThreadPlanCallFunction::SetStopOthers (bool new_value)
{
m_subplan_sp->SetStopOthers(new_value);
}
bool
ThreadPlanCallFunction::RestoreThreadState()
{
return GetThread().RestoreThreadStateFromCheckpoint(m_stored_thread_state);
}
void
ThreadPlanCallFunction::SetReturnValue()
{
ProcessSP process_sp(m_thread.GetProcess());
const ABI *abi = process_sp ? process_sp->GetABI().get() : nullptr;
if (abi && m_return_type.IsValid())
{
const bool persistent = false;
m_return_valobj_sp = abi->GetReturnValueObject(m_thread, m_return_type, persistent);
}
}
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