llvm-project/lldb/source/DataFormatters/ValueObjectPrinter.cpp

695 lines
21 KiB
C++

//===-- ValueObjectPrinter.cpp -------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/DataFormatters/ValueObjectPrinter.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/Debugger.h"
#include "lldb/DataFormatters/DataVisualization.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Target/Target.h"
using namespace lldb;
using namespace lldb_private;
ValueObjectPrinter::ValueObjectPrinter (ValueObject* valobj,
Stream* s,
const DumpValueObjectOptions& options)
{
Init(valobj,s,options,options.m_max_ptr_depth,0);
}
ValueObjectPrinter::ValueObjectPrinter (ValueObject* valobj,
Stream* s,
const DumpValueObjectOptions& options,
uint32_t ptr_depth,
uint32_t curr_depth)
{
Init(valobj,s,options,ptr_depth,curr_depth);
}
void
ValueObjectPrinter::Init (ValueObject* valobj,
Stream* s,
const DumpValueObjectOptions& options,
uint32_t ptr_depth,
uint32_t curr_depth)
{
m_orig_valobj = valobj;
m_valobj = nullptr;
m_stream = s;
this->options = options;
m_ptr_depth = ptr_depth;
m_curr_depth = curr_depth;
assert (m_orig_valobj && "cannot print a NULL ValueObject");
assert (m_stream && "cannot print to a NULL Stream");
m_should_print = eLazyBoolCalculate;
m_is_nil = eLazyBoolCalculate;
m_is_ptr = eLazyBoolCalculate;
m_is_ref = eLazyBoolCalculate;
m_is_aggregate = eLazyBoolCalculate;
m_summary_formatter = {nullptr,false};
m_value.assign("");
m_summary.assign("");
m_error.assign("");
}
bool
ValueObjectPrinter::PrintValueObject ()
{
if (!GetMostSpecializedValue () || m_valobj == nullptr)
return false;
if (ShouldPrintValueObject())
{
PrintValidationMarkerIfNeeded();
PrintLocationIfNeeded();
m_stream->Indent();
bool show_type = PrintTypeIfNeeded();
PrintNameIfNeeded(show_type);
}
bool value_printed = false;
bool summary_printed = false;
bool val_summary_ok = PrintValueAndSummaryIfNeeded (value_printed,summary_printed);
if (val_summary_ok)
PrintChildrenIfNeeded (value_printed, summary_printed);
else
m_stream->EOL();
PrintValidationErrorIfNeeded();
return true;
}
bool
ValueObjectPrinter::GetMostSpecializedValue ()
{
if (m_valobj)
return true;
bool update_success = m_orig_valobj->UpdateValueIfNeeded (true);
if (!update_success)
{
m_valobj = m_orig_valobj;
}
else
{
if (m_orig_valobj->IsDynamic())
{
if (options.m_use_dynamic == eNoDynamicValues)
{
ValueObject *static_value = m_orig_valobj->GetStaticValue().get();
if (static_value)
m_valobj = static_value;
else
m_valobj = m_orig_valobj;
}
else
m_valobj = m_orig_valobj;
}
else
{
if (options.m_use_dynamic != eNoDynamicValues)
{
ValueObject *dynamic_value = m_orig_valobj->GetDynamicValue(options.m_use_dynamic).get();
if (dynamic_value)
m_valobj = dynamic_value;
else
m_valobj = m_orig_valobj;
}
else
m_valobj = m_orig_valobj;
}
if (m_valobj->IsSynthetic())
{
if (options.m_use_synthetic == false)
{
ValueObject *non_synthetic = m_valobj->GetNonSyntheticValue().get();
if (non_synthetic)
m_valobj = non_synthetic;
}
}
else
{
if (options.m_use_synthetic == true)
{
ValueObject *synthetic = m_valobj->GetSyntheticValue().get();
if (synthetic)
m_valobj = synthetic;
}
}
}
m_clang_type = m_valobj->GetClangType();
m_type_flags = m_clang_type.GetTypeInfo ();
return true;
}
const char*
ValueObjectPrinter::GetDescriptionForDisplay ()
{
const char* str = m_valobj->GetObjectDescription();
if (!str)
str = m_valobj->GetSummaryAsCString();
if (!str)
str = m_valobj->GetValueAsCString();
return str;
}
const char*
ValueObjectPrinter::GetRootNameForDisplay (const char* if_fail)
{
const char *root_valobj_name = options.m_root_valobj_name.empty() ?
m_valobj->GetName().AsCString() :
options.m_root_valobj_name.c_str();
return root_valobj_name ? root_valobj_name : if_fail;
}
bool
ValueObjectPrinter::ShouldPrintValueObject ()
{
if (m_should_print == eLazyBoolCalculate)
m_should_print = (options.m_flat_output == false || m_type_flags.Test (eTypeHasValue)) ? eLazyBoolYes : eLazyBoolNo;
return m_should_print == eLazyBoolYes;
}
bool
ValueObjectPrinter::IsNil ()
{
if (m_is_nil == eLazyBoolCalculate)
m_is_nil = m_valobj->IsObjCNil() ? eLazyBoolYes : eLazyBoolNo;
return m_is_nil == eLazyBoolYes;
}
bool
ValueObjectPrinter::IsPtr ()
{
if (m_is_ptr == eLazyBoolCalculate)
m_is_ptr = m_type_flags.Test (eTypeIsPointer) ? eLazyBoolYes : eLazyBoolNo;
return m_is_ptr == eLazyBoolYes;
}
bool
ValueObjectPrinter::IsRef ()
{
if (m_is_ref == eLazyBoolCalculate)
m_is_ref = m_type_flags.Test (eTypeIsReference) ? eLazyBoolYes : eLazyBoolNo;
return m_is_ref == eLazyBoolYes;
}
bool
ValueObjectPrinter::IsAggregate ()
{
if (m_is_aggregate == eLazyBoolCalculate)
m_is_aggregate = m_type_flags.Test (eTypeHasChildren) ? eLazyBoolYes : eLazyBoolNo;
return m_is_aggregate == eLazyBoolYes;
}
bool
ValueObjectPrinter::PrintLocationIfNeeded ()
{
if (options.m_show_location)
{
m_stream->Printf("%s: ", m_valobj->GetLocationAsCString());
return true;
}
return false;
}
bool
ValueObjectPrinter::PrintTypeIfNeeded ()
{
bool show_type = true;
// if we are at the root-level and been asked to hide the root's type, then hide it
if (m_curr_depth == 0 && options.m_hide_root_type)
show_type = false;
else
// otherwise decide according to the usual rules (asked to show types - always at the root level)
show_type = options.m_show_types || (m_curr_depth == 0 && !options.m_flat_output);
if (show_type)
{
// Some ValueObjects don't have types (like registers sets). Only print
// the type if there is one to print
ConstString type_name;
if (options.m_use_type_display_name)
type_name = m_valobj->GetDisplayTypeName();
else
type_name = m_valobj->GetQualifiedTypeName();
if (type_name)
m_stream->Printf("(%s) ", type_name.GetCString());
else
show_type = false;
}
return show_type;
}
bool
ValueObjectPrinter::PrintNameIfNeeded (bool show_type)
{
if (options.m_flat_output)
{
// If we are showing types, also qualify the C++ base classes
const bool qualify_cxx_base_classes = show_type;
if (!options.m_hide_name)
{
m_valobj->GetExpressionPath(*m_stream, qualify_cxx_base_classes);
m_stream->PutCString(" =");
return true;
}
}
else if (!options.m_hide_name)
{
const char *name_cstr = GetRootNameForDisplay("");
m_stream->Printf ("%s =", name_cstr);
return true;
}
return false;
}
bool
ValueObjectPrinter::CheckScopeIfNeeded ()
{
if (options.m_scope_already_checked)
return true;
return m_valobj->IsInScope();
}
TypeSummaryImpl*
ValueObjectPrinter::GetSummaryFormatter ()
{
if (m_summary_formatter.second == false)
{
TypeSummaryImpl* entry = options.m_summary_sp ? options.m_summary_sp.get() : m_valobj->GetSummaryFormat().get();
if (options.m_omit_summary_depth > 0)
entry = NULL;
m_summary_formatter.first = entry;
m_summary_formatter.second = true;
}
return m_summary_formatter.first;
}
void
ValueObjectPrinter::GetValueSummaryError (std::string& value,
std::string& summary,
std::string& error)
{
if (options.m_format != eFormatDefault && options.m_format != m_valobj->GetFormat())
{
m_valobj->GetValueAsCString(options.m_format,
value);
}
else
{
const char* val_cstr = m_valobj->GetValueAsCString();
if (val_cstr)
value.assign(val_cstr);
}
const char* err_cstr = m_valobj->GetError().AsCString();
if (err_cstr)
error.assign(err_cstr);
if (ShouldPrintValueObject())
{
if (IsNil())
summary.assign("nil");
else if (options.m_omit_summary_depth == 0)
{
TypeSummaryImpl* entry = GetSummaryFormatter();
if (entry)
m_valobj->GetSummaryAsCString(entry, summary);
else
{
const char* sum_cstr = m_valobj->GetSummaryAsCString();
if (sum_cstr)
summary.assign(sum_cstr);
}
}
}
}
bool
ValueObjectPrinter::PrintValueAndSummaryIfNeeded (bool& value_printed,
bool& summary_printed)
{
bool error_printed = false;
if (ShouldPrintValueObject())
{
if (!CheckScopeIfNeeded())
m_error.assign("out of scope");
if (m_error.empty())
{
GetValueSummaryError(m_value, m_summary, m_error);
}
if (m_error.size())
{
error_printed = true;
m_stream->Printf (" <%s>\n", m_error.c_str());
}
else
{
// Make sure we have a value and make sure the summary didn't
// specify that the value should not be printed - and do not print
// the value if this thing is nil
// (but show the value if the user passes a format explicitly)
TypeSummaryImpl* entry = GetSummaryFormatter();
if (!IsNil() && !m_value.empty() && (entry == NULL || (entry->DoesPrintValue(m_valobj) || options.m_format != eFormatDefault) || m_summary.empty()) && !options.m_hide_value)
{
m_stream->Printf(" %s", m_value.c_str());
value_printed = true;
}
if (m_summary.size())
{
m_stream->Printf(" %s", m_summary.c_str());
summary_printed = true;
}
}
}
return !error_printed;
}
bool
ValueObjectPrinter::PrintObjectDescriptionIfNeeded (bool value_printed,
bool summary_printed)
{
if (ShouldPrintValueObject())
{
// let's avoid the overly verbose no description error for a nil thing
if (options.m_use_objc && !IsNil())
{
if (!options.m_hide_value || !options.m_hide_name)
m_stream->Printf(" ");
const char *object_desc = nullptr;
if (value_printed || summary_printed)
object_desc = m_valobj->GetObjectDescription();
else
object_desc = GetDescriptionForDisplay();
if (object_desc && *object_desc)
{
m_stream->Printf("%s\n", object_desc);
return true;
}
else if (value_printed == false && summary_printed == false)
return true;
else
return false;
}
}
return true;
}
bool
ValueObjectPrinter::ShouldPrintChildren (bool is_failed_description,
uint32_t& curr_ptr_depth)
{
const bool is_ref = IsRef ();
const bool is_ptr = IsPtr ();
if (is_failed_description || m_curr_depth < options.m_max_depth)
{
// We will show children for all concrete types. We won't show
// pointer contents unless a pointer depth has been specified.
// We won't reference contents unless the reference is the
// root object (depth of zero).
// Use a new temporary pointer depth in case we override the
// current pointer depth below...
if (is_ptr || is_ref)
{
// We have a pointer or reference whose value is an address.
// Make sure that address is not NULL
AddressType ptr_address_type;
if (m_valobj->GetPointerValue (&ptr_address_type) == 0)
return false;
else if (is_ref && m_curr_depth == 0 && curr_ptr_depth == 0)
{
// If this is the root object (depth is zero) that we are showing
// and it is a reference, and no pointer depth has been supplied
// print out what it references. Don't do this at deeper depths
// otherwise we can end up with infinite recursion...
curr_ptr_depth = 1;
}
return (curr_ptr_depth > 0);
}
TypeSummaryImpl* entry = GetSummaryFormatter();
return (!entry || entry->DoesPrintChildren(m_valobj) || m_summary.empty());
}
return false;
}
ValueObject*
ValueObjectPrinter::GetValueObjectForChildrenGeneration ()
{
return m_valobj;
}
void
ValueObjectPrinter::PrintChildrenPreamble ()
{
if (options.m_flat_output)
{
if (ShouldPrintValueObject())
m_stream->EOL();
}
else
{
if (ShouldPrintValueObject())
m_stream->PutCString(IsRef () ? ": {\n" : " {\n");
m_stream->IndentMore();
}
}
void
ValueObjectPrinter::PrintChild (ValueObjectSP child_sp,
uint32_t curr_ptr_depth)
{
DumpValueObjectOptions child_options(options);
child_options.SetFormat(options.m_format).SetSummary().SetRootValueObjectName();
child_options.SetScopeChecked(true).SetHideName(options.m_hide_name).SetHideValue(options.m_hide_value)
.SetOmitSummaryDepth(child_options.m_omit_summary_depth > 1 ? child_options.m_omit_summary_depth - 1 : 0);
if (child_sp.get())
{
ValueObjectPrinter child_printer(child_sp.get(),
m_stream,
child_options,
(IsPtr() || IsRef()) && curr_ptr_depth >= 1 ? curr_ptr_depth - 1 : curr_ptr_depth,
m_curr_depth + 1);
child_printer.PrintValueObject();
}
}
uint32_t
ValueObjectPrinter::GetMaxNumChildrenToPrint (bool& print_dotdotdot)
{
ValueObject* synth_m_valobj = GetValueObjectForChildrenGeneration();
size_t num_children = synth_m_valobj->GetNumChildren();
print_dotdotdot = false;
if (num_children)
{
const size_t max_num_children = m_valobj->GetTargetSP()->GetMaximumNumberOfChildrenToDisplay();
if (num_children > max_num_children && !options.m_ignore_cap)
{
print_dotdotdot = true;
return max_num_children;
}
}
return num_children;
}
void
ValueObjectPrinter::PrintChildrenPostamble (bool print_dotdotdot)
{
if (!options.m_flat_output)
{
if (print_dotdotdot)
{
m_valobj->GetTargetSP()->GetDebugger().GetCommandInterpreter().ChildrenTruncated();
m_stream->Indent("...\n");
}
m_stream->IndentLess();
m_stream->Indent("}\n");
}
}
void
ValueObjectPrinter::PrintChildren (uint32_t curr_ptr_depth)
{
ValueObject* synth_m_valobj = GetValueObjectForChildrenGeneration();
bool print_dotdotdot = false;
size_t num_children = GetMaxNumChildrenToPrint(print_dotdotdot);
if (num_children)
{
PrintChildrenPreamble ();
for (size_t idx=0; idx<num_children; ++idx)
{
ValueObjectSP child_sp(synth_m_valobj->GetChildAtIndex(idx, true));
PrintChild (child_sp, curr_ptr_depth);
}
PrintChildrenPostamble (print_dotdotdot);
}
else if (IsAggregate())
{
// Aggregate, no children...
if (ShouldPrintValueObject())
{
// if it has a synthetic value, then don't print {}, the synthetic children are probably only being used to vend a value
if (m_valobj->DoesProvideSyntheticValue())
m_stream->PutCString( "\n");
else
m_stream->PutCString(" {}\n");
}
}
else
{
if (ShouldPrintValueObject())
m_stream->EOL();
}
}
bool
ValueObjectPrinter::PrintChildrenOneLiner (bool hide_names)
{
if (!GetMostSpecializedValue () || m_valobj == nullptr)
return false;
ValueObject* synth_m_valobj = GetValueObjectForChildrenGeneration();
bool print_dotdotdot = false;
size_t num_children = GetMaxNumChildrenToPrint(print_dotdotdot);
if (num_children)
{
m_stream->PutChar('(');
for (uint32_t idx=0; idx<num_children; ++idx)
{
lldb::ValueObjectSP child_sp(synth_m_valobj->GetChildAtIndex(idx, true));
if (child_sp)
child_sp = child_sp->GetQualifiedRepresentationIfAvailable(options.m_use_dynamic, options.m_use_synthetic);
if (child_sp)
{
if (idx)
m_stream->PutCString(", ");
if (!hide_names)
{
const char* name = child_sp.get()->GetName().AsCString();
if (name && *name)
{
m_stream->PutCString(name);
m_stream->PutCString(" = ");
}
}
child_sp->DumpPrintableRepresentation(*m_stream,
ValueObject::eValueObjectRepresentationStyleSummary,
lldb::eFormatInvalid,
ValueObject::ePrintableRepresentationSpecialCasesDisable);
}
}
if (print_dotdotdot)
m_stream->PutCString(", ...)");
else
m_stream->PutChar(')');
}
return true;
}
void
ValueObjectPrinter::PrintChildrenIfNeeded (bool value_printed,
bool summary_printed)
{
// this flag controls whether we tried to display a description for this object and failed
// if that happens, we want to display the children, if any
bool is_failed_description = !PrintObjectDescriptionIfNeeded(value_printed, summary_printed);
uint32_t curr_ptr_depth = m_ptr_depth;
bool print_children = ShouldPrintChildren (is_failed_description,curr_ptr_depth);
bool print_oneline = (curr_ptr_depth > 0 || options.m_show_types || !options.m_allow_oneliner_mode) ? false : DataVisualization::ShouldPrintAsOneLiner(*m_valobj);
if (print_children)
{
if (print_oneline)
{
m_stream->PutChar(' ');
PrintChildrenOneLiner (false);
m_stream->EOL();
}
else
PrintChildren (curr_ptr_depth);
}
else if (m_curr_depth >= options.m_max_depth && IsAggregate() && ShouldPrintValueObject())
{
m_stream->PutCString("{...}\n");
}
else
m_stream->EOL();
}
bool
ValueObjectPrinter::ShouldPrintValidation ()
{
return options.m_run_validator;
}
bool
ValueObjectPrinter::PrintValidationMarkerIfNeeded ()
{
if (!ShouldPrintValidation())
return false;
m_validation = m_valobj->GetValidationStatus();
if (TypeValidatorResult::Failure == m_validation.first)
{
m_stream->Printf("! ");
return true;
}
return false;
}
bool
ValueObjectPrinter::PrintValidationErrorIfNeeded ()
{
if (!ShouldPrintValidation())
return false;
if (TypeValidatorResult::Success == m_validation.first)
return false;
if (m_validation.second.empty())
m_validation.second.assign("unknown error");
m_stream->Printf(" ! validation error: %s", m_validation.second.c_str());
m_stream->EOL();
return true;
}