| 1 | //===-- MemoryTagMap.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 "lldb/Target/MemoryTagMap.h" |
| 10 | #include <optional> |
| 11 | |
| 12 | using namespace lldb_private; |
| 13 | |
| 14 | MemoryTagMap::MemoryTagMap(const MemoryTagManager *manager) |
| 15 | : m_manager(manager) { |
| 16 | assert(m_manager && "valid tag manager required to construct a MemoryTagMap"); |
| 17 | } |
| 18 | |
| 19 | void MemoryTagMap::InsertTags(lldb::addr_t addr, |
| 20 | const std::vector<lldb::addr_t> tags) { |
| 21 | // We're assuming that addr has no non address bits and is granule aligned. |
| 22 | size_t granule_size = m_manager->GetGranuleSize(); |
| 23 | for (auto tag : tags) { |
| 24 | m_addr_to_tag[addr] = tag; |
| 25 | addr += granule_size; |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | bool MemoryTagMap::Empty() const { return m_addr_to_tag.empty(); } |
| 30 | |
| 31 | std::vector<std::optional<lldb::addr_t>> |
| 32 | MemoryTagMap::GetTags(lldb::addr_t addr, size_t len) const { |
| 33 | // Addr and len might be unaligned |
| 34 | addr = m_manager->RemoveTagBits(addr); |
| 35 | MemoryTagManager::TagRange range(addr, len); |
| 36 | range = m_manager->ExpandToGranule(range); |
| 37 | |
| 38 | std::vector<std::optional<lldb::addr_t>> tags; |
| 39 | lldb::addr_t end_addr = range.GetRangeEnd(); |
| 40 | addr = range.GetRangeBase(); |
| 41 | bool got_valid_tags = false; |
| 42 | size_t granule_size = m_manager->GetGranuleSize(); |
| 43 | |
| 44 | for (; addr < end_addr; addr += granule_size) { |
| 45 | std::optional<lldb::addr_t> tag = GetTag(addr); |
| 46 | tags.push_back(x: tag); |
| 47 | if (tag) |
| 48 | got_valid_tags = true; |
| 49 | } |
| 50 | |
| 51 | // To save the caller checking if every item is std::nullopt, |
| 52 | // we return an empty vector if we got no tags at all. |
| 53 | if (got_valid_tags) |
| 54 | return tags; |
| 55 | return {}; |
| 56 | } |
| 57 | |
| 58 | std::optional<lldb::addr_t> MemoryTagMap::GetTag(lldb::addr_t addr) const { |
| 59 | // Here we assume that addr is granule aligned, just like when the tags |
| 60 | // were inserted. |
| 61 | auto found = m_addr_to_tag.find(x: addr); |
| 62 | if (found == m_addr_to_tag.end()) |
| 63 | return std::nullopt; |
| 64 | return found->second; |
| 65 | } |
| 66 |