lldb/unittests/SymbolFile/DWARF/DWARFDIETest.cpp

   1 //===-- DWARFDIETest.cpp ----------------------------------------------=---===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "Plugins/SymbolFile/DWARF/DWARFDIE.h"
  10 #include "TestingSupport/Symbol/YAMLModuleTester.h"
  11 #include "llvm/ADT/STLExtras.h"
  12 #include "gmock/gmock.h"
  13 #include "gtest/gtest.h"
  14
  15 using namespace lldb;
  16 using namespace lldb_private;
  17
  18 TEST(DWARFDIETest, ChildIteration) {
  19   // Tests DWARFDIE::child_iterator.
  20
  21   const char *yamldata = R"(
  22 --- !ELF
  23 FileHeader:
  24   Class:   ELFCLASS64
  25   Data:    ELFDATA2LSB
  26   Type:    ET_EXEC
  27   Machine: EM_386
  28 DWARF:
  29   debug_abbrev:
  30     - Table:
  31         - Code:            0x00000001
  32           Tag:             DW_TAG_compile_unit
  33           Children:        DW_CHILDREN_yes
  34           Attributes:
  35             - Attribute:       DW_AT_language
  36               Form:            DW_FORM_data2
  37         - Code:            0x00000002
  38           Tag:             DW_TAG_base_type
  39           Children:        DW_CHILDREN_no
  40           Attributes:
  41             - Attribute:       DW_AT_encoding
  42               Form:            DW_FORM_data1
  43             - Attribute:       DW_AT_byte_size
  44               Form:            DW_FORM_data1
  45   debug_info:
  46     - Version:         4
  47       AddrSize:        8
  48       Entries:
  49         - AbbrCode:        0x00000001
  50           Values:
  51             - Value:           0x000000000000000C
  52         - AbbrCode:        0x00000002
  53           Values:
  54             - Value:           0x0000000000000007 # DW_ATE_unsigned
  55             - Value:           0x0000000000000004
  56         - AbbrCode:        0x00000002
  57           Values:
  58             - Value:           0x0000000000000007 # DW_ATE_unsigned
  59             - Value:           0x0000000000000008
  60         - AbbrCode:        0x00000002
  61           Values:
  62             - Value:           0x0000000000000005 # DW_ATE_signed
  63             - Value:           0x0000000000000008
  64         - AbbrCode:        0x00000000
  65 )";
  66
  67   YAMLModuleTester t(yamldata);
  68   ASSERT_TRUE((bool)t.GetDwarfUnit());
  69
  70   DWARFUnit *unit = t.GetDwarfUnit();
  71   const DWARFDebugInfoEntry *die_first = unit->DIE().GetDIE();
  72
  73   // Create a DWARFDIE that has three DW_TAG_base_type children.
  74   DWARFDIE top_die(unit, die_first);
  75
  76   // Create the iterator range that has the three tags as elements.
  77   llvm::iterator_range<DWARFDIE::child_iterator> children = top_die.children();
  78
  79   // Compare begin() to the first child DIE.
  80   DWARFDIE::child_iterator child_iter = children.begin();
  81   ASSERT_NE(child_iter, children.end());
  82   const DWARFDebugInfoEntry *die_child0 = die_first->GetFirstChild();
  83   EXPECT_EQ((*child_iter).GetDIE(), die_child0);
  84
  85   // Step to the second child DIE.
  86   ++child_iter;
  87   ASSERT_NE(child_iter, children.end());
  88   const DWARFDebugInfoEntry *die_child1 = die_child0->GetSibling();
  89   EXPECT_EQ((*child_iter).GetDIE(), die_child1);
  90
  91   // Step to the third child DIE.
  92   ++child_iter;
  93   ASSERT_NE(child_iter, children.end());
  94   const DWARFDebugInfoEntry *die_child2 = die_child1->GetSibling();
  95   EXPECT_EQ((*child_iter).GetDIE(), die_child2);
  96
  97   // Step to the end of the range.
  98   ++child_iter;
  99   EXPECT_EQ(child_iter, children.end());
 100
 101   // Take one of the DW_TAG_base_type DIEs (which has no children) and make
 102   // sure the children range is now empty.
 103   DWARFDIE no_children_die(unit, die_child0);
 104   EXPECT_TRUE(no_children_die.children().empty());
 105 }