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Introduce the notion of "runtime support values" 

A runtime support value is a ValueObject whose only purpose is to support some language runtime's operation, but it does not directly provide any user-visible benefit
As such, unless the user is working on the runtime support, it is mostly safe for them not to see such a value when debugging

It is a language runtime's job to check whether a ValueObject is a support value, and that - in conjunction with a target setting - is used by frame variable and target variable
SBFrame::GetVariables gets a new overload with yet another flag to dictate whether to return those support values to the caller - that which defaults to the setting's value

rdar://problem/15539930

llvm-svn: 228791
This commit is contained in:
Enrico Granata 2015-02-11 02:35:39 +00:00
parent 7ad134a746
commit 560558eb7c
13 changed files with 127 additions and 5 deletions
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8
lldb/include/lldb/API/SBFrame.h
View File

@ -156,6 +156,14 @@ public:
bool in_scope_only,
lldb::DynamicValueType use_dynamic);
lldb::SBValueList
GetVariables (bool arguments,
bool locals,
bool statics,
bool in_scope_only,
bool include_runtime_support_values,
lldb::DynamicValueType use_dynamic);
lldb::SBValueList
GetRegisters ();

3
lldb/include/lldb/API/SBValue.h
View File

@ -327,6 +327,9 @@ public:
bool
MightHaveChildren ();
bool
IsRuntimeSupportValue ();
uint32_t
GetNumChildren ();

3
lldb/include/lldb/Core/ValueObject.h
View File

@ -993,6 +993,9 @@ public:
virtual bool
MightHaveChildren();
virtual bool
IsRuntimeSupportValue ();
protected:
typedef ClusterManager<ValueObject> ValueObjectManager;

6
lldb/include/lldb/Target/LanguageRuntime.h
View File

@ -110,6 +110,12 @@ public:
return false;
}
virtual bool
IsRuntimeSupportValue (const ValueObject& valobj)
{
return false;
}
protected:
//------------------------------------------------------------------
// Classes that inherit from LanguageRuntime can see and modify these

6
lldb/include/lldb/Target/Target.h
View File

@ -189,6 +189,12 @@ public:
void
SetUserSpecifiedTrapHandlerNames (const Args &args);
bool
GetDisplayRuntimeSupportValues () const;
void
SetDisplayRuntimeSupportValues (bool b);
};
typedef std::shared_ptr<TargetProperties> TargetPropertiesSP;

8
lldb/scripts/Python/interface/SBFrame.i
View File

@ -198,6 +198,14 @@ public:
bool in_scope_only,
lldb::DynamicValueType use_dynamic);
lldb::SBValueList
GetVariables (bool arguments,
bool locals,
bool statics,
bool in_scope_only,
bool include_runtime_support_values,
lldb::DynamicValueType use_dynamic);
lldb::SBValueList
GetRegisters ();

3
lldb/scripts/Python/interface/SBValue.i
View File

@ -315,6 +315,9 @@ public:
bool
MightHaveChildren ();
bool
IsRuntimeSupportValue ();
uint32_t
GetNumChildren ();

25
lldb/source/API/SBFrame.cpp
View File

@ -1080,11 +1080,30 @@ SBFrame::GetVariables (bool arguments,
return value_list;
}
lldb::SBValueList
SBFrame::GetVariables (bool arguments,
bool locals,
bool statics,
bool in_scope_only,
lldb::DynamicValueType use_dynamic)
{
ExecutionContext exe_ctx(m_opaque_sp.get());
Target *target = exe_ctx.GetTargetPtr();
bool include_runtime_support_values = target ? target->GetDisplayRuntimeSupportValues() : false;
return GetVariables(arguments,
locals,
statics,
in_scope_only,
include_runtime_support_values,
use_dynamic);
}
SBValueList
SBFrame::GetVariables (bool arguments,
bool locals,
bool statics,
bool in_scope_only,
bool include_runtime_support_values,
lldb::DynamicValueType use_dynamic)
{
Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
@ -1147,6 +1166,12 @@ SBFrame::GetVariables (bool arguments,
continue;
ValueObjectSP valobj_sp(frame->GetValueObjectForFrameVariable (variable_sp, eNoDynamicValues));
if (false == include_runtime_support_values &&
valobj_sp &&
true == valobj_sp->IsRuntimeSupportValue())
continue;
SBValue value_sb;
value_sb.SetSP(valobj_sp,use_dynamic);
value_list.Append(value_sb);

16
lldb/source/API/SBValue.cpp
View File

@ -1244,6 +1244,22 @@ SBValue::MightHaveChildren ()
return has_children;
}
bool
SBValue::IsRuntimeSupportValue ()
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
bool is_support = false;
ValueLocker locker;
lldb::ValueObjectSP value_sp(GetSP(locker));
if (value_sp)
is_support = value_sp->IsRuntimeSupportValue();
if (log)
log->Printf ("SBValue(%p)::IsRuntimeSupportValue() => %i",
static_cast<void*>(value_sp.get()), is_support);
return is_support;
}
uint32_t
SBValue::GetNumChildren ()
{

16
lldb/source/Commands/CommandObjectFrame.cpp
View File

@ -522,30 +522,31 @@ protected:
{
var_sp = variable_list->GetVariableAtIndex(i);
bool dump_variable = true;
std::string scope_string;
switch (var_sp->GetScope())
{
case eValueTypeVariableGlobal:
dump_variable = m_option_variable.show_globals;
if (dump_variable && m_option_variable.show_scope)
s.PutCString("GLOBAL: ");
scope_string = "GLOBAL: ";
break;
case eValueTypeVariableStatic:
dump_variable = m_option_variable.show_globals;
if (dump_variable && m_option_variable.show_scope)
s.PutCString("STATIC: ");
scope_string = "STATIC: ";
break;
case eValueTypeVariableArgument:
dump_variable = m_option_variable.show_args;
if (dump_variable && m_option_variable.show_scope)
s.PutCString(" ARG: ");
scope_string = " ARG: ";
break;
case eValueTypeVariableLocal:
dump_variable = m_option_variable.show_locals;
if (dump_variable && m_option_variable.show_scope)
s.PutCString(" LOCAL: ");
scope_string = " LOCAL: ";
break;
default:
@ -568,6 +569,13 @@ protected:
// that are not in scope to avoid extra unneeded output
if (valobj_sp->IsInScope ())
{
if (false == valobj_sp->GetTargetSP()->GetDisplayRuntimeSupportValues() &&
true == valobj_sp->IsRuntimeSupportValue())
continue;
if (!scope_string.empty())
s.PutCString(scope_string.c_str());
if (m_option_variable.show_decl && var_sp->GetDeclaration ().GetFile())
{
var_sp->GetDeclaration ().DumpStopContext (&s, false);

4
lldb/source/Commands/CommandObjectTarget.cpp
View File

@ -773,6 +773,10 @@ public:
{
DumpValueObjectOptions options(m_varobj_options.GetAsDumpOptions());
if (false == valobj_sp->GetTargetSP()->GetDisplayRuntimeSupportValues() &&
true == valobj_sp->IsRuntimeSupportValue())
return;
switch (var_sp->GetScope())
{
case eValueTypeVariableGlobal:

15
lldb/source/Core/ValueObject.cpp
View File

@ -2063,6 +2063,21 @@ ValueObject::IsPossibleDynamicType ()
return GetClangType().IsPossibleDynamicType (NULL, true, true);
}
bool
ValueObject::IsRuntimeSupportValue ()
{
Process *process(GetProcessSP().get());
if (process)
{
LanguageRuntime *runtime = process->GetLanguageRuntime(GetObjectRuntimeLanguage());
if (!runtime)
runtime = process->GetObjCLanguageRuntime();
if (runtime)
return runtime->IsRuntimeSupportValue(*this);
}
return false;
}
bool
ValueObject::IsObjCNil ()
{

19
lldb/source/Target/Target.cpp
View File

@ -2889,8 +2889,10 @@ g_properties[] =
"'minimal' is the fastest setting and will load section data with no symbols, but should rarely be used as stack frames in these memory regions will be inaccurate and not provide any context (fastest). " },
{ "display-expression-in-crashlogs" , OptionValue::eTypeBoolean , false, false, NULL, NULL, "Expressions that crash will show up in crash logs if the host system supports executable specific crash log strings and this setting is set to true." },
{ "trap-handler-names" , OptionValue::eTypeArray , true, OptionValue::eTypeString, NULL, NULL, "A list of trap handler function names, e.g. a common Unix user process one is _sigtramp." },
{ "display-runtime-support-values" , OptionValue::eTypeBoolean , false, false, NULL, NULL, "If true, LLDB will show variables that are meant to support the operation of a language's runtime support." },
{ NULL , OptionValue::eTypeInvalid , false, 0 , NULL, NULL, NULL }
};
enum
{
ePropertyDefaultArch,
@ -2923,7 +2925,8 @@ enum
ePropertyLoadScriptFromSymbolFile,
ePropertyMemoryModuleLoadLevel,
ePropertyDisplayExpressionsInCrashlogs,
ePropertyTrapHandlerNames
ePropertyTrapHandlerNames,
ePropertyDisplayRuntimeSupportValues
};
@ -3358,6 +3361,20 @@ TargetProperties::SetUserSpecifiedTrapHandlerNames (const Args &args)
m_collection_sp->SetPropertyAtIndexFromArgs (NULL, idx, args);
}
bool
TargetProperties::GetDisplayRuntimeSupportValues () const
{
const uint32_t idx = ePropertyDisplayRuntimeSupportValues;
return m_collection_sp->GetPropertyAtIndexAsBoolean (NULL, idx, false);
}
void
TargetProperties::SetDisplayRuntimeSupportValues (bool b)
{
const uint32_t idx = ePropertyDisplayRuntimeSupportValues;
m_collection_sp->SetPropertyAtIndexAsBoolean (NULL, idx, b);
}
//----------------------------------------------------------------------
// Target::TargetEventData
//----------------------------------------------------------------------