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
TEST(DWARFDIETest,ChildIteration)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 }
106