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//===-- DWARFDeclContext.cpp ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DWARFDeclContext.h"
#include "llvm/Support/raw_ostream.h"
using namespace lldb_private::dwarf;
using namespace lldb_private::plugin::dwarf;
/// Returns the name of `entry` if it has one, or the appropriate "anonymous
/// {namespace, class, struct, union}".
static const char *GetName(DWARFDeclContext::Entry entry) {
if (entry.name != nullptr)
return entry.name;
if (entry.tag == DW_TAG_namespace)
return "(anonymous namespace)";
if (entry.tag == DW_TAG_class_type)
return "(anonymous class)";
if (entry.tag == DW_TAG_structure_type)
return "(anonymous struct)";
if (entry.tag == DW_TAG_union_type)
return "(anonymous union)";
return "(anonymous)";
}
const char *DWARFDeclContext::GetQualifiedName() const {
if (m_qualified_name.empty()) {
// The declaration context array for a class named "foo" in namespace
// "a::b::c" will be something like:
// [0] DW_TAG_class_type "foo"
// [1] DW_TAG_namespace "c"
// [2] DW_TAG_namespace "b"
// [3] DW_TAG_namespace "a"
if (!m_entries.empty()) {
if (m_entries.size() == 1) {
if (m_entries[0].name) {
m_qualified_name.append("::");
m_qualified_name.append(m_entries[0].name);
}
} else {
llvm::raw_string_ostream string_stream(m_qualified_name);
llvm::interleave(
llvm::reverse(m_entries), string_stream,
[&](auto entry) { string_stream << GetName(entry); }, "::");
}
}
}
if (m_qualified_name.empty())
return nullptr;
return m_qualified_name.c_str();
}
bool DWARFDeclContext::operator==(const DWARFDeclContext &rhs) const {
if (m_entries.size() != rhs.m_entries.size())
return false;
collection::const_iterator pos;
collection::const_iterator begin = m_entries.begin();
collection::const_iterator end = m_entries.end();
collection::const_iterator rhs_pos;
collection::const_iterator rhs_begin = rhs.m_entries.begin();
// The two entry arrays have the same size
// First compare the tags before we do expensive name compares
for (pos = begin, rhs_pos = rhs_begin; pos != end; ++pos, ++rhs_pos) {
if (pos->tag != rhs_pos->tag) {
// Check for DW_TAG_structure_type and DW_TAG_class_type as they are
// often used interchangeably in GCC
if (pos->tag == DW_TAG_structure_type &&
rhs_pos->tag == DW_TAG_class_type)
continue;
if (pos->tag == DW_TAG_class_type &&
rhs_pos->tag == DW_TAG_structure_type)
continue;
return false;
}
}
// The tags all match, now compare the names
for (pos = begin, rhs_pos = rhs_begin; pos != end; ++pos, ++rhs_pos) {
if (!pos->NameMatches(*rhs_pos))
return false;
}
// All tags and names match
return true;
}
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