contrib/llvm/tools/lldb/source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp

   1 //===-- LibStdcppUniquePointer.cpp ------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "LibStdcpp.h"
  11
  12 #include "lldb/Core/ValueObject.h"
  13 #include "lldb/DataFormatters/FormattersHelpers.h"
  14 #include "lldb/DataFormatters/TypeSynthetic.h"
  15 #include "lldb/Utility/ConstString.h"
  16
  17 #include <memory>
  18 #include <vector>
  19
  20 using namespace lldb;
  21 using namespace lldb_private;
  22 using namespace lldb_private::formatters;
  23
  24 namespace {
  25
  26 class LibStdcppUniquePtrSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
  27 public:
  28   explicit LibStdcppUniquePtrSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
  29
  30   size_t CalculateNumChildren() override;
  31
  32   lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
  33
  34   bool Update() override;
  35
  36   bool MightHaveChildren() override;
  37
  38   size_t GetIndexOfChildWithName(const ConstString &name) override;
  39
  40   bool GetSummary(Stream &stream, const TypeSummaryOptions &options);
  41
  42 private:
  43   ValueObjectSP m_ptr_obj;
  44   ValueObjectSP m_obj_obj;
  45   ValueObjectSP m_del_obj;
  46 };
  47
  48 } // end of anonymous namespace
  49
  50 LibStdcppUniquePtrSyntheticFrontEnd::LibStdcppUniquePtrSyntheticFrontEnd(
  51     lldb::ValueObjectSP valobj_sp)
  52     : SyntheticChildrenFrontEnd(*valobj_sp) {
  53   Update();
  54 }
  55
  56 bool LibStdcppUniquePtrSyntheticFrontEnd::Update() {
  57   ValueObjectSP valobj_backend_sp = m_backend.GetSP();
  58   if (!valobj_backend_sp)
  59     return false;
  60
  61   ValueObjectSP valobj_sp = valobj_backend_sp->GetNonSyntheticValue();
  62   if (!valobj_sp)
  63     return false;
  64
  65   ValueObjectSP tuple_sp =
  66       valobj_sp->GetChildMemberWithName(ConstString("_M_t"), true);
  67   if (!tuple_sp)
  68     return false;
  69
  70   std::unique_ptr<SyntheticChildrenFrontEnd> tuple_frontend(
  71       LibStdcppTupleSyntheticFrontEndCreator(nullptr, tuple_sp));
  72
  73   ValueObjectSP ptr_obj = tuple_frontend->GetChildAtIndex(0);
  74   if (ptr_obj)
  75     m_ptr_obj = ptr_obj->Clone(ConstString("pointer"));
  76
  77   ValueObjectSP del_obj = tuple_frontend->GetChildAtIndex(1);
  78   if (del_obj)
  79     m_del_obj = del_obj->Clone(ConstString("deleter"));
  80
  81   if (m_ptr_obj) {
  82     Status error;
  83     ValueObjectSP obj_obj = m_ptr_obj->Dereference(error);
  84     if (error.Success()) {
  85       m_obj_obj = obj_obj->Clone(ConstString("object"));
  86     }
  87   }
  88
  89   return false;
  90 }
  91
  92 bool LibStdcppUniquePtrSyntheticFrontEnd::MightHaveChildren() { return true; }
  93
  94 lldb::ValueObjectSP
  95 LibStdcppUniquePtrSyntheticFrontEnd::GetChildAtIndex(size_t idx) {
  96   if (idx == 0)
  97     return m_ptr_obj;
  98   if (idx == 1)
  99     return m_del_obj;
 100   if (idx == 2)
 101     return m_obj_obj;
 102   return lldb::ValueObjectSP();
 103 }
 104
 105 size_t LibStdcppUniquePtrSyntheticFrontEnd::CalculateNumChildren() {
 106   if (m_del_obj)
 107     return 2;
 108   return 1;
 109 }
 110
 111 size_t LibStdcppUniquePtrSyntheticFrontEnd::GetIndexOfChildWithName(
 112     const ConstString &name) {
 113   if (name == ConstString("ptr") || name == ConstString("pointer"))
 114     return 0;
 115   if (name == ConstString("del") || name == ConstString("deleter"))
 116     return 1;
 117   if (name == ConstString("obj") || name == ConstString("object") ||
 118       name == ConstString("$$dereference$$"))
 119     return 2;
 120   return UINT32_MAX;
 121 }
 122
 123 bool LibStdcppUniquePtrSyntheticFrontEnd::GetSummary(
 124     Stream &stream, const TypeSummaryOptions &options) {
 125   if (!m_ptr_obj)
 126     return false;
 127
 128   bool success;
 129   uint64_t ptr_value = m_ptr_obj->GetValueAsUnsigned(0, &success);
 130   if (!success)
 131     return false;
 132   if (ptr_value == 0)
 133     stream.Printf("nullptr");
 134   else
 135     stream.Printf("0x%" PRIx64, ptr_value);
 136   return true;
 137 }
 138
 139 SyntheticChildrenFrontEnd *
 140 lldb_private::formatters::LibStdcppUniquePtrSyntheticFrontEndCreator(
 141     CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
 142   return (valobj_sp ? new LibStdcppUniquePtrSyntheticFrontEnd(valobj_sp)
 143                     : nullptr);
 144 }
 145
 146 bool lldb_private::formatters::LibStdcppUniquePointerSummaryProvider(
 147     ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
 148   LibStdcppUniquePtrSyntheticFrontEnd formatter(valobj.GetSP());
 149   return formatter.GetSummary(stream, options);
 150 }