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llvm-project/lldb/source/Breakpoint/BreakpointLocation.cpp

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//===-- BreakpointLocation.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/Breakpoint/BreakpointLocation.h"
#include "lldb/Breakpoint/BreakpointID.h"
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Expression/DiagnosticManager.h"
#include "lldb/Expression/ExpressionVariable.h"
#include "lldb/Expression/UserExpression.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Symbol/TypeSystem.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadSpec.h"
using namespace lldb;
using namespace lldb_private;
BreakpointLocation::BreakpointLocation(break_id_t loc_id, Breakpoint &owner, const Address &addr, lldb::tid_t tid,
bool hardware, bool check_for_resolver)
: StoppointLocation(loc_id, addr.GetOpcodeLoadAddress(&owner.GetTarget()), hardware),
m_being_created(true),
m_should_resolve_indirect_functions(false),
m_is_reexported(false),
m_is_indirect(false),
m_address(addr),
m_owner(owner),
m_options_ap(),
m_bp_site_sp(),
m_condition_mutex()
{
if (check_for_resolver)
{
Symbol *symbol = m_address.CalculateSymbolContextSymbol();
if (symbol && symbol->IsIndirect())
{
SetShouldResolveIndirectFunctions(true);
}
}
SetThreadID(tid);
m_being_created = false;
}
BreakpointLocation::~BreakpointLocation()
{
ClearBreakpointSite();
}
lldb::addr_t
BreakpointLocation::GetLoadAddress () const
{
return m_address.GetOpcodeLoadAddress (&m_owner.GetTarget());
}
Address &
BreakpointLocation::GetAddress ()
{
return m_address;
}
Breakpoint &
BreakpointLocation::GetBreakpoint ()
{
return m_owner;
}
Target &
BreakpointLocation::GetTarget()
{
return m_owner.GetTarget();
}
bool
BreakpointLocation::IsEnabled () const
{
if (!m_owner.IsEnabled())
return false;
else if (m_options_ap.get() != nullptr)
return m_options_ap->IsEnabled();
else
return true;
}
void
BreakpointLocation::SetEnabled (bool enabled)
{
GetLocationOptions()->SetEnabled(enabled);
if (enabled)
{
ResolveBreakpointSite();
}
else
{
ClearBreakpointSite();
}
SendBreakpointLocationChangedEvent (enabled ? eBreakpointEventTypeEnabled : eBreakpointEventTypeDisabled);
}
void
BreakpointLocation::SetThreadID (lldb::tid_t thread_id)
{
if (thread_id != LLDB_INVALID_THREAD_ID)
GetLocationOptions()->SetThreadID(thread_id);
else
{
// If we're resetting this to an invalid thread id, then
// don't make an options pointer just to do that.
if (m_options_ap.get() != nullptr)
m_options_ap->SetThreadID (thread_id);
}
SendBreakpointLocationChangedEvent (eBreakpointEventTypeThreadChanged);
}
lldb::tid_t
BreakpointLocation::GetThreadID ()
{
if (GetOptionsNoCreate()->GetThreadSpecNoCreate())
return GetOptionsNoCreate()->GetThreadSpecNoCreate()->GetTID();
else
return LLDB_INVALID_THREAD_ID;
}
void
BreakpointLocation::SetThreadIndex (uint32_t index)
{
if (index != 0)
GetLocationOptions()->GetThreadSpec()->SetIndex(index);
else
{
// If we're resetting this to an invalid thread id, then
// don't make an options pointer just to do that.
if (m_options_ap.get() != nullptr)
m_options_ap->GetThreadSpec()->SetIndex(index);
}
SendBreakpointLocationChangedEvent (eBreakpointEventTypeThreadChanged);
}
uint32_t
BreakpointLocation::GetThreadIndex() const
{
if (GetOptionsNoCreate()->GetThreadSpecNoCreate())
return GetOptionsNoCreate()->GetThreadSpecNoCreate()->GetIndex();
else
return 0;
}
void
BreakpointLocation::SetThreadName (const char *thread_name)
{
if (thread_name != nullptr)
GetLocationOptions()->GetThreadSpec()->SetName(thread_name);
else
{
// If we're resetting this to an invalid thread id, then
// don't make an options pointer just to do that.
if (m_options_ap.get() != nullptr)
m_options_ap->GetThreadSpec()->SetName(thread_name);
}
SendBreakpointLocationChangedEvent (eBreakpointEventTypeThreadChanged);
}
const char *
BreakpointLocation::GetThreadName () const
{
if (GetOptionsNoCreate()->GetThreadSpecNoCreate())
return GetOptionsNoCreate()->GetThreadSpecNoCreate()->GetName();
else
return nullptr;
}
void
BreakpointLocation::SetQueueName (const char *queue_name)
{
if (queue_name != nullptr)
GetLocationOptions()->GetThreadSpec()->SetQueueName(queue_name);
else
{
// If we're resetting this to an invalid thread id, then
// don't make an options pointer just to do that.
if (m_options_ap.get() != nullptr)
m_options_ap->GetThreadSpec()->SetQueueName(queue_name);
}
SendBreakpointLocationChangedEvent (eBreakpointEventTypeThreadChanged);
}
const char *
BreakpointLocation::GetQueueName () const
{
if (GetOptionsNoCreate()->GetThreadSpecNoCreate())
return GetOptionsNoCreate()->GetThreadSpecNoCreate()->GetQueueName();
else
return nullptr;
}
bool
BreakpointLocation::InvokeCallback (StoppointCallbackContext *context)
{
if (m_options_ap.get() != nullptr && m_options_ap->HasCallback())
return m_options_ap->InvokeCallback (context, m_owner.GetID(), GetID());
else
return m_owner.InvokeCallback (context, GetID());
}
void
BreakpointLocation::SetCallback (BreakpointHitCallback callback, void *baton,
bool is_synchronous)
{
// The default "Baton" class will keep a copy of "baton" and won't free
// or delete it when it goes goes out of scope.
GetLocationOptions()->SetCallback(callback, BatonSP (new Baton(baton)), is_synchronous);
SendBreakpointLocationChangedEvent (eBreakpointEventTypeCommandChanged);
}
void
BreakpointLocation::SetCallback (BreakpointHitCallback callback, const BatonSP &baton_sp,
bool is_synchronous)
{
GetLocationOptions()->SetCallback (callback, baton_sp, is_synchronous);
SendBreakpointLocationChangedEvent (eBreakpointEventTypeCommandChanged);
}
void
BreakpointLocation::ClearCallback ()
{
GetLocationOptions()->ClearCallback();
}
void
BreakpointLocation::SetCondition (const char *condition)
{
GetLocationOptions()->SetCondition (condition);
SendBreakpointLocationChangedEvent (eBreakpointEventTypeConditionChanged);
}
const char *
BreakpointLocation::GetConditionText (size_t *hash) const
{
return GetOptionsNoCreate()->GetConditionText(hash);
}
bool
BreakpointLocation::ConditionSaysStop (ExecutionContext &exe_ctx, Error &error)
{
Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
std::lock_guard<std::mutex> guard(m_condition_mutex);
size_t condition_hash;
const char *condition_text = GetConditionText(&condition_hash);
if (!condition_text)
{
m_user_expression_sp.reset();
return false;
}
DiagnosticManager diagnostics;
if (condition_hash != m_condition_hash || !m_user_expression_sp || !m_user_expression_sp->MatchesContext(exe_ctx))
{
LanguageType language = eLanguageTypeUnknown;
// See if we can figure out the language from the frame, otherwise use the default language:
CompileUnit *comp_unit = m_address.CalculateSymbolContextCompileUnit();
if (comp_unit)
language = comp_unit->GetLanguage();
Error error;
m_user_expression_sp.reset(GetTarget().GetUserExpressionForLanguage(condition_text,
nullptr,
language,
Expression::eResultTypeAny,
EvaluateExpressionOptions(),
error));
if (error.Fail())
{
if (log)
log->Printf("Error getting condition expression: %s.", error.AsCString());
m_user_expression_sp.reset();
return true;
}
if (!m_user_expression_sp->Parse(diagnostics, exe_ctx, eExecutionPolicyOnlyWhenNeeded, true, false))
{
error.SetErrorStringWithFormat("Couldn't parse conditional expression:\n%s",
diagnostics.GetString().c_str());
m_user_expression_sp.reset();
return false;
}
m_condition_hash = condition_hash;
}
// 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.
ValueObjectSP result_value_sp;
EvaluateExpressionOptions options;
options.SetUnwindOnError(true);
options.SetIgnoreBreakpoints(true);
options.SetTryAllThreads(true);
options.SetResultIsInternal(true); // Don't generate a user variable for condition expressions.
Error expr_error;
diagnostics.Clear();
ExpressionVariableSP result_variable_sp;
ExpressionResults result_code =
m_user_expression_sp->Execute(diagnostics, exe_ctx, options, m_user_expression_sp, result_variable_sp);
bool ret;
if (result_code == eExpressionCompleted)
{
if (!result_variable_sp)
{
error.SetErrorString("Expression did not return a result");
return false;
}
result_value_sp = result_variable_sp->GetValueObject();
if (result_value_sp)
{
ret = result_value_sp->IsLogicalTrue(error);
if (log)
{
if (error.Success())
{
log->Printf("Condition successfully evaluated, result is %s.\n",
ret ? "true" : "false");
}
else
{
error.SetErrorString("Failed to get an integer result from the expression");
ret = false;
}
}
}
else
{
ret = false;
error.SetErrorString("Failed to get any result from the expression");
}
}
else
{
ret = false;
error.SetErrorStringWithFormat("Couldn't execute expression:\n%s", diagnostics.GetString().c_str());
}
return ret;
}
uint32_t
BreakpointLocation::GetIgnoreCount ()
{
return GetOptionsNoCreate()->GetIgnoreCount();
}
void
BreakpointLocation::SetIgnoreCount (uint32_t n)
{
GetLocationOptions()->SetIgnoreCount(n);
SendBreakpointLocationChangedEvent (eBreakpointEventTypeIgnoreChanged);
}
void
BreakpointLocation::DecrementIgnoreCount()
{
if (m_options_ap.get() != nullptr)
{
uint32_t loc_ignore = m_options_ap->GetIgnoreCount();
if (loc_ignore != 0)
m_options_ap->SetIgnoreCount(loc_ignore - 1);
}
}
bool
BreakpointLocation::IgnoreCountShouldStop()
{
if (m_options_ap.get() != nullptr)
{
uint32_t loc_ignore = m_options_ap->GetIgnoreCount();
if (loc_ignore != 0)
{
m_owner.DecrementIgnoreCount();
DecrementIgnoreCount(); // Have to decrement our owners' ignore count, since it won't get a
// chance to.
return false;
}
}
return true;
}
const BreakpointOptions *
BreakpointLocation::GetOptionsNoCreate () const
{
if (m_options_ap.get() != nullptr)
return m_options_ap.get();
else
return m_owner.GetOptions ();
}
BreakpointOptions *
BreakpointLocation::GetLocationOptions ()
{
// If we make the copy we don't copy the callbacks because that is potentially
// expensive and we don't want to do that for the simple case where someone is
// just disabling the location.
if (m_options_ap.get() == nullptr)
m_options_ap.reset(BreakpointOptions::CopyOptionsNoCallback(*m_owner.GetOptions ()));
return m_options_ap.get();
}
bool
BreakpointLocation::ValidForThisThread (Thread *thread)
{
return thread->MatchesSpec(GetOptionsNoCreate()->GetThreadSpecNoCreate());
}
// RETURNS - true if we should stop at this breakpoint, false if we
// should continue. Note, we don't check the thread spec for the breakpoint
// here, since if the breakpoint is not for this thread, then the event won't
// even get reported, so the check is redundant.
bool
BreakpointLocation::ShouldStop (StoppointCallbackContext *context)
{
bool should_stop = true;
Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
// Do this first, if a location is disabled, it shouldn't increment its hit count.
if (!IsEnabled())
return false;
if (!IgnoreCountShouldStop())
return false;
if (!m_owner.IgnoreCountShouldStop())
return false;
// We only run synchronous callbacks in ShouldStop:
context->is_synchronous = true;
should_stop = InvokeCallback (context);
if (log)
{
StreamString s;
GetDescription (&s, lldb::eDescriptionLevelVerbose);
log->Printf ("Hit breakpoint location: %s, %s.\n", s.GetData(), should_stop ? "stopping" : "continuing");
}
return should_stop;
}
void
BreakpointLocation::BumpHitCount()
{
if (IsEnabled())
{
// Step our hit count, and also step the hit count of the owner.
IncrementHitCount();
m_owner.IncrementHitCount();
}
}
void
BreakpointLocation::UndoBumpHitCount()
{
if (IsEnabled())
{
// Step our hit count, and also step the hit count of the owner.
DecrementHitCount();
m_owner.DecrementHitCount();
}
}
bool
BreakpointLocation::IsResolved () const
{
return m_bp_site_sp.get() != nullptr;
}
lldb::BreakpointSiteSP
BreakpointLocation::GetBreakpointSite() const
{
return m_bp_site_sp;
}
bool
BreakpointLocation::ResolveBreakpointSite ()
{
if (m_bp_site_sp)
return true;
Process *process = m_owner.GetTarget().GetProcessSP().get();
if (process == nullptr)
return false;
lldb::break_id_t new_id = process->CreateBreakpointSite (shared_from_this(), m_owner.IsHardware());
if (new_id == LLDB_INVALID_BREAK_ID)
{
Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
if (log)
log->Warning ("Tried to add breakpoint site at 0x%" PRIx64 " but it was already present.\n",
m_address.GetOpcodeLoadAddress (&m_owner.GetTarget()));
return false;
}
return true;
}
bool
BreakpointLocation::SetBreakpointSite (BreakpointSiteSP& bp_site_sp)
{
m_bp_site_sp = bp_site_sp;
SendBreakpointLocationChangedEvent (eBreakpointEventTypeLocationsResolved);
return true;
}
bool
BreakpointLocation::ClearBreakpointSite ()
{
if (m_bp_site_sp.get())
{
ProcessSP process_sp(m_owner.GetTarget().GetProcessSP());
// If the process exists, get it to remove the owner, it will remove the physical implementation
// of the breakpoint as well if there are no more owners. Otherwise just remove this owner.
if (process_sp)
process_sp->RemoveOwnerFromBreakpointSite (GetBreakpoint().GetID(),
GetID(), m_bp_site_sp);
else
m_bp_site_sp->RemoveOwner(GetBreakpoint().GetID(), GetID());
m_bp_site_sp.reset();
return true;
}
return false;
}
void
BreakpointLocation::GetDescription (Stream *s, lldb::DescriptionLevel level)
{
SymbolContext sc;
// If the description level is "initial" then the breakpoint is printing out our initial state,
// and we should let it decide how it wants to print our label.
if (level != eDescriptionLevelInitial)
{
s->Indent();
BreakpointID::GetCanonicalReference(s, m_owner.GetID(), GetID());
}
if (level == lldb::eDescriptionLevelBrief)
return;
if (level != eDescriptionLevelInitial)
s->PutCString(": ");
if (level == lldb::eDescriptionLevelVerbose)
s->IndentMore();
if (m_address.IsSectionOffset())
{
m_address.CalculateSymbolContext(&sc);
if (level == lldb::eDescriptionLevelFull || level == eDescriptionLevelInitial)
{
if (IsReExported())
s->PutCString ("re-exported target = ");
else
s->PutCString("where = ");
sc.DumpStopContext (s, m_owner.GetTarget().GetProcessSP().get(), m_address, false, true, false, true, true);
}
else
{
if (sc.module_sp)
{
s->EOL();
s->Indent("module = ");
sc.module_sp->GetFileSpec().Dump (s);
}
if (sc.comp_unit != nullptr)
{
s->EOL();
s->Indent("compile unit = ");
static_cast<FileSpec*>(sc.comp_unit)->GetFilename().Dump (s);
if (sc.function != nullptr)
{
s->EOL();
s->Indent("function = ");
s->PutCString (sc.function->GetName().AsCString("<unknown>"));
}
if (sc.line_entry.line > 0)
{
s->EOL();
s->Indent("location = ");
sc.line_entry.DumpStopContext (s, true);
}
}
else
{
// If we don't have a comp unit, see if we have a symbol we can print.
if (sc.symbol)
{
s->EOL();
if (IsReExported())
s->Indent ("re-exported target = ");
else
s->Indent("symbol = ");
s->PutCString(sc.symbol->GetName().AsCString("<unknown>"));
}
}
}
}
if (level == lldb::eDescriptionLevelVerbose)
{
s->EOL();
s->Indent();
}
if (m_address.IsSectionOffset() && (level == eDescriptionLevelFull || level == eDescriptionLevelInitial))
s->Printf (", ");
s->Printf ("address = ");
ExecutionContextScope *exe_scope = nullptr;
Target *target = &m_owner.GetTarget();
if (target)
exe_scope = target->GetProcessSP().get();
if (exe_scope == nullptr)
exe_scope = target;
if (level == eDescriptionLevelInitial)
m_address.Dump(s, exe_scope, Address::DumpStyleLoadAddress, Address::DumpStyleFileAddress);
else
m_address.Dump(s, exe_scope, Address::DumpStyleLoadAddress, Address::DumpStyleModuleWithFileAddress);
if (IsIndirect() && m_bp_site_sp)
{
Address resolved_address;
resolved_address.SetLoadAddress(m_bp_site_sp->GetLoadAddress(), target);
Symbol *resolved_symbol = resolved_address.CalculateSymbolContextSymbol();
if (resolved_symbol)
{
if (level == eDescriptionLevelFull || level == eDescriptionLevelInitial)
s->Printf (", ");
else if (level == lldb::eDescriptionLevelVerbose)
{
s->EOL();
s->Indent();
}
s->Printf ("indirect target = %s", resolved_symbol->GetName().GetCString());
}
}
if (level == lldb::eDescriptionLevelVerbose)
{
s->EOL();
s->Indent();
s->Printf("resolved = %s\n", IsResolved() ? "true" : "false");
s->Indent();
s->Printf ("hit count = %-4u\n", GetHitCount());
if (m_options_ap.get())
{
s->Indent();
m_options_ap->GetDescription (s, level);
s->EOL();
}
s->IndentLess();
}
else if (level != eDescriptionLevelInitial)
{
s->Printf(", %sresolved, hit count = %u ",
(IsResolved() ? "" : "un"),
GetHitCount());
if (m_options_ap.get())
{
m_options_ap->GetDescription (s, level);
}
}
}
void
BreakpointLocation::Dump(Stream *s) const
{
if (s == nullptr)
return;
s->Printf("BreakpointLocation %u: tid = %4.4" PRIx64 " load addr = 0x%8.8" PRIx64 " state = %s type = %s breakpoint "
"hw_index = %i hit_count = %-4u ignore_count = %-4u",
GetID(),
GetOptionsNoCreate()->GetThreadSpecNoCreate()->GetTID(),
(uint64_t) m_address.GetOpcodeLoadAddress (&m_owner.GetTarget()),
(m_options_ap.get() ? m_options_ap->IsEnabled() : m_owner.IsEnabled()) ? "enabled " : "disabled",
IsHardware() ? "hardware" : "software",
GetHardwareIndex(),
GetHitCount(),
GetOptionsNoCreate()->GetIgnoreCount());
}
void
BreakpointLocation::SendBreakpointLocationChangedEvent (lldb::BreakpointEventType eventKind)
{
if (!m_being_created
&& !m_owner.IsInternal()
&& m_owner.GetTarget().EventTypeHasListeners(Target::eBroadcastBitBreakpointChanged))
{
Breakpoint::BreakpointEventData *data = new Breakpoint::BreakpointEventData (eventKind,
m_owner.shared_from_this());
data->GetBreakpointLocationCollection().Add (shared_from_this());
m_owner.GetTarget().BroadcastEvent (Target::eBroadcastBitBreakpointChanged, data);
}
}
void
BreakpointLocation::SwapLocation (BreakpointLocationSP swap_from)
{
m_address = swap_from->m_address;
m_should_resolve_indirect_functions = swap_from->m_should_resolve_indirect_functions;
m_is_reexported = swap_from->m_is_reexported;
m_is_indirect = swap_from->m_is_indirect;
m_user_expression_sp.reset();
}
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