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llvm-project/lldb/source/Breakpoint/BreakpointLocation.cpp
Greg Clayton 2d4edfbc6a Modified all logging calls to hand out shared pointers to make sure we 
don't crash if we disable logging when some code already has a copy of the
logger. Prior to this fix, logs were handed out as pointers and if they were
held onto while a log got disabled, then it could cause a crash. Now all logs
are handed out as shared pointers so this problem shouldn't happen anymore.
We are also using our new shared pointers that put the shared pointer count
and the object into the same allocation for a tad better performance.

llvm-svn: 118319
2010-11-06 01:53:30 +00:00

448 lines
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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
#include <string>
// 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/Log.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/ThreadPlan.h"
#include "lldb/Target/Process.h"
#include "lldb/Core/StreamString.h"
#include "lldb/lldb-private-log.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,
Address &addr,
lldb::tid_t tid,
bool hardware
) :
StoppointLocation (loc_id, addr.GetLoadAddress(&owner.GetTarget()), hardware),
m_address (addr),
m_owner (owner),
m_options_ap (),
m_bp_site_sp ()
{
SetThreadID (tid);
}
BreakpointLocation::~BreakpointLocation()
{
ClearBreakpointSite();
}
lldb::addr_t
BreakpointLocation::GetLoadAddress () const
{
return m_address.GetLoadAddress(&m_owner.GetTarget());
}
Address &
BreakpointLocation::GetAddress ()
{
return m_address;
}
Breakpoint &
BreakpointLocation::GetBreakpoint ()
{
return m_owner;
}
bool
BreakpointLocation::IsEnabled ()
{
if (!m_owner.IsEnabled())
return false;
else if (m_options_ap.get() != NULL)
return m_options_ap->IsEnabled();
else
return true;
}
void
BreakpointLocation::SetEnabled (bool enabled)
{
GetLocationOptions()->SetEnabled(enabled);
if (enabled)
{
ResolveBreakpointSite();
}
else
{
ClearBreakpointSite();
}
}
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() != NULL)
m_options_ap->SetThreadID (thread_id);
}
}
bool
BreakpointLocation::InvokeCallback (StoppointCallbackContext *context)
{
if (m_options_ap.get() != NULL && 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);
}
void
BreakpointLocation::SetCallback (BreakpointHitCallback callback, const BatonSP &baton_sp,
bool is_synchronous)
{
GetLocationOptions()->SetCallback (callback, baton_sp, is_synchronous);
}
void
BreakpointLocation::ClearCallback ()
{
GetLocationOptions()->ClearCallback();
}
void
BreakpointLocation::SetCondition (const char *condition)
{
GetLocationOptions()->SetCondition (condition);
}
ThreadPlan *
BreakpointLocation::GetThreadPlanToTestCondition (ExecutionContext &exe_ctx, Stream &error)
{
lldb::BreakpointLocationSP my_sp(m_owner.GetLocationSP(this));
if (m_options_ap.get())
return m_options_ap->GetThreadPlanToTestCondition (exe_ctx, my_sp, error);
else
return m_owner.GetThreadPlanToTestCondition (exe_ctx, my_sp, error);
}
const char *
BreakpointLocation::GetConditionText ()
{
return GetLocationOptions()->GetConditionText();
}
uint32_t
BreakpointLocation::GetIgnoreCount ()
{
return GetOptionsNoCreate()->GetIgnoreCount();
}
void
BreakpointLocation::SetIgnoreCount (uint32_t n)
{
GetLocationOptions()->SetIgnoreCount(n);
}
const BreakpointOptions *
BreakpointLocation::GetOptionsNoCreate () const
{
if (m_options_ap.get() != NULL)
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() == NULL)
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;
LogSP log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
m_hit_count++;
if (!IsEnabled())
return false;
if (m_hit_count <= GetIgnoreCount())
return false;
// Next in order of importance is the condition. See if it is true:
StreamString errors;
// We only run synchronous callbacks in ShouldStop:
context->is_synchronous = true;
should_stop = InvokeCallback (context);
// The SYNCHRONOUS callback says we should stop, next try the condition.
if (should_stop)
{
ThreadPlanSP condition_plan_sp(GetThreadPlanToTestCondition(context->exe_ctx, errors));
log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
if (log && errors.GetSize() > 0)
{
log->Printf("Error evaluating condition: \"%s\".\n", errors.GetData());
}
else if (condition_plan_sp != NULL)
{
context->exe_ctx.thread->QueueThreadPlan(condition_plan_sp, false);
return false;
}
}
if (should_stop)
{
log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
if (log)
{
StreamString s;
GetDescription (&s, lldb::eDescriptionLevelVerbose);
log->Printf ("Hit breakpoint location: %s\n", s.GetData());
}
}
return should_stop;
}
bool
BreakpointLocation::IsResolved () const
{
return m_bp_site_sp.get() != NULL;
}
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 == NULL)
return false;
if (m_owner.GetTarget().GetSectionLoadList().IsEmpty())
return false;
BreakpointLocationSP myself_sp(m_owner.GetLocationSP (this));
lldb::break_id_t new_id = process->CreateBreakpointSite (myself_sp, false);
if (new_id == LLDB_INVALID_BREAK_ID)
{
LogSP log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
if (log)
log->Warning ("Tried to add breakpoint site at 0x%llx but it was already present.\n",
m_address.GetLoadAddress(&m_owner.GetTarget()));
return false;
}
return true;
}
bool
BreakpointLocation::SetBreakpointSite (BreakpointSiteSP& bp_site_sp)
{
m_bp_site_sp = bp_site_sp;
return true;
}
bool
BreakpointLocation::ClearBreakpointSite ()
{
if (m_bp_site_sp.get())
{
m_owner.GetTarget().GetProcessSP()->RemoveOwnerFromBreakpointSite (GetBreakpoint().GetID(),
GetID(), m_bp_site_sp);
m_bp_site_sp.reset();
return true;
}
return false;
}
void
BreakpointLocation::GetDescription (Stream *s, lldb::DescriptionLevel level)
{
SymbolContext sc;
s->Indent();
BreakpointID::GetCanonicalReference(s, m_owner.GetID(), GetID());
if (level == lldb::eDescriptionLevelBrief)
return;
s->PutCString(": ");
if (level == lldb::eDescriptionLevelVerbose)
s->IndentMore();
if (m_address.IsSectionOffset())
{
m_address.CalculateSymbolContext(&sc);
if (level == lldb::eDescriptionLevelFull)
{
s->PutCString("where = ");
sc.DumpStopContext (s, m_owner.GetTarget().GetProcessSP().get(), m_address, false, true, false);
}
else
{
if (sc.module_sp)
{
s->EOL();
s->Indent("module = ");
sc.module_sp->GetFileSpec().Dump (s);
}
if (sc.comp_unit != NULL)
{
s->EOL();
s->Indent("compile unit = ");
static_cast<FileSpec*>(sc.comp_unit)->GetFilename().Dump (s);
if (sc.function != NULL)
{
s->EOL();
s->Indent("function = ");
s->PutCString (sc.function->GetMangled().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();
s->Indent("symbol = ");
s->PutCString(sc.symbol->GetMangled().GetName().AsCString("<unknown>"));
}
}
}
}
if (level == lldb::eDescriptionLevelVerbose)
{
s->EOL();
s->Indent();
}
s->Printf ("%saddress = ", (level == lldb::eDescriptionLevelFull && m_address.IsSectionOffset()) ? ", " : "");
ExecutionContextScope *exe_scope = NULL;
Target *target = &m_owner.GetTarget();
if (target)
exe_scope = target->GetProcessSP().get();
if (exe_scope == NULL)
exe_scope = target;
m_address.Dump(s, exe_scope, Address::DumpStyleLoadAddress, Address::DumpStyleModuleWithFileAddress);
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
{
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 == NULL)
return;
s->Printf("BreakpointLocation %u: tid = %4.4x load addr = 0x%8.8llx state = %s type = %s breakpoint "
"hw_index = %i hit_count = %-4u ignore_count = %-4u",
GetID(),
GetOptionsNoCreate()->GetThreadSpecNoCreate()->GetTID(),
(uint64_t) m_address.GetLoadAddress (&m_owner.GetTarget()),
(m_options_ap.get() ? m_options_ap->IsEnabled() : m_owner.IsEnabled()) ? "enabled " : "disabled",
IsHardware() ? "hardware" : "software",
GetHardwareIndex(),
GetHitCount(),
m_options_ap.get() ? m_options_ap->GetIgnoreCount() : m_owner.GetIgnoreCount());
}
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