| 1 | //===-- DWARFDeclContext.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 "DWARFDeclContext.h" |
| 10 | #include "llvm/Support/raw_ostream.h" |
| 11 | |
| 12 | using namespace lldb_private::dwarf; |
| 13 | using namespace lldb_private::plugin::dwarf; |
| 14 | |
| 15 | const char *DWARFDeclContext::Entry::GetName() const { |
| 16 | if (name != nullptr) |
| 17 | return name; |
| 18 | if (tag == DW_TAG_namespace) |
| 19 | return "(anonymous namespace)"; |
| 20 | if (tag == DW_TAG_class_type) |
| 21 | return "(anonymous class)"; |
| 22 | if (tag == DW_TAG_structure_type) |
| 23 | return "(anonymous struct)"; |
| 24 | if (tag == DW_TAG_union_type) |
| 25 | return "(anonymous union)"; |
| 26 | return "(anonymous)"; |
| 27 | } |
| 28 | |
| 29 | const char *DWARFDeclContext::GetQualifiedName() const { |
| 30 | if (m_qualified_name.empty()) { |
| 31 | // The declaration context array for a class named "foo" in namespace |
| 32 | // "a::b::c" will be something like: |
| 33 | // [0] DW_TAG_class_type "foo" |
| 34 | // [1] DW_TAG_namespace "c" |
| 35 | // [2] DW_TAG_namespace "b" |
| 36 | // [3] DW_TAG_namespace "a" |
| 37 | if (!m_entries.empty()) { |
| 38 | if (m_entries.size() == 1) { |
| 39 | if (m_entries[0].name) { |
| 40 | m_qualified_name.append(s: "::"); |
| 41 | m_qualified_name.append(s: m_entries[0].name); |
| 42 | } |
| 43 | } else { |
| 44 | llvm::raw_string_ostream string_stream(m_qualified_name); |
| 45 | llvm::interleave( |
| 46 | c: llvm::reverse(C: m_entries), os&: string_stream, |
| 47 | each_fn: [&](auto entry) { string_stream << entry.GetName(); }, separator: "::"); |
| 48 | } |
| 49 | } |
| 50 | } |
| 51 | if (m_qualified_name.empty()) |
| 52 | return nullptr; |
| 53 | return m_qualified_name.c_str(); |
| 54 | } |
| 55 | |
| 56 | bool DWARFDeclContext::operator==(const DWARFDeclContext &rhs) const { |
| 57 | if (m_entries.size() != rhs.m_entries.size()) |
| 58 | return false; |
| 59 | |
| 60 | collection::const_iterator pos; |
| 61 | collection::const_iterator begin = m_entries.begin(); |
| 62 | collection::const_iterator end = m_entries.end(); |
| 63 | |
| 64 | collection::const_iterator rhs_pos; |
| 65 | collection::const_iterator rhs_begin = rhs.m_entries.begin(); |
| 66 | // The two entry arrays have the same size |
| 67 | |
| 68 | // First compare the tags before we do expensive name compares |
| 69 | for (pos = begin, rhs_pos = rhs_begin; pos != end; ++pos, ++rhs_pos) { |
| 70 | if (pos->tag != rhs_pos->tag) { |
| 71 | // Check for DW_TAG_structure_type and DW_TAG_class_type as they are |
| 72 | // often used interchangeably in GCC |
| 73 | if (pos->tag == DW_TAG_structure_type && |
| 74 | rhs_pos->tag == DW_TAG_class_type) |
| 75 | continue; |
| 76 | if (pos->tag == DW_TAG_class_type && |
| 77 | rhs_pos->tag == DW_TAG_structure_type) |
| 78 | continue; |
| 79 | return false; |
| 80 | } |
| 81 | } |
| 82 | // The tags all match, now compare the names |
| 83 | for (pos = begin, rhs_pos = rhs_begin; pos != end; ++pos, ++rhs_pos) { |
| 84 | if (!pos->NameMatches(rhs: *rhs_pos)) |
| 85 | return false; |
| 86 | } |
| 87 | // All tags and names match |
| 88 | return true; |
| 89 | } |
| 90 |