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//===-- 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"
#include <optional>
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<std::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<std::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) {
std::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 std::nullopt,
// we return an empty vector if we got no tags at all.
if (got_valid_tags)
return tags;
return {};
}
std::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 std::nullopt;
return found->second;
}
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