| //===-- MemoryTagMap.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 "lldb/Target/MemoryTagMap.h" |
| |
| using namespace lldb_private; |
| |
| MemoryTagMap::MemoryTagMap(const MemoryTagManager *manager) |
| : m_manager(manager) { |
| assert(m_manager && "valid tag manager required to construct a MemoryTagMap"); |
| } |
| |
| void MemoryTagMap::InsertTags(lldb::addr_t addr, |
| const std::vector<lldb::addr_t> tags) { |
| // We're assuming that addr has no non address bits and is granule aligned. |
| size_t granule_size = m_manager->GetGranuleSize(); |
| for (auto tag : tags) { |
| m_addr_to_tag[addr] = tag; |
| addr += granule_size; |
| } |
| } |
| |
| bool MemoryTagMap::Empty() const { return m_addr_to_tag.empty(); } |
| |
| std::vector<llvm::Optional<lldb::addr_t>> |
| MemoryTagMap::GetTags(lldb::addr_t addr, size_t len) const { |
| // Addr and len might be unaligned |
| addr = m_manager->RemoveTagBits(addr); |
| MemoryTagManager::TagRange range(addr, len); |
| range = m_manager->ExpandToGranule(range); |
| |
| std::vector<llvm::Optional<lldb::addr_t>> tags; |
| lldb::addr_t end_addr = range.GetRangeEnd(); |
| addr = range.GetRangeBase(); |
| bool got_valid_tags = false; |
| size_t granule_size = m_manager->GetGranuleSize(); |
| |
| for (; addr < end_addr; addr += granule_size) { |
| llvm::Optional<lldb::addr_t> tag = GetTag(addr); |
| tags.push_back(tag); |
| if (tag) |
| got_valid_tags = true; |
| } |
| |
| // To save the caller checking if every item is llvm::None, |
| // we return an empty vector if we got no tags at all. |
| if (got_valid_tags) |
| return tags; |
| return {}; |
| } |
| |
| llvm::Optional<lldb::addr_t> MemoryTagMap::GetTag(lldb::addr_t addr) const { |
| // Here we assume that addr is granule aligned, just like when the tags |
| // were inserted. |
| auto found = m_addr_to_tag.find(addr); |
| if (found == m_addr_to_tag.end()) |
| return llvm::None; |
| return found->second; |
| } |