Add a MemoryOfflineBuffer object.
Use this for offline stack data so that it's not necessary to
copy any data around.
Add unit tests for the new object.
Bug: 77258731
Bug: 74354410
Test: Ran libunwindstack/libbacktrace unit tests.
Change-Id: I9b0f25d9520c96e64aedef5f295423c60ddb3488
diff --git a/libunwindstack/Memory.cpp b/libunwindstack/Memory.cpp
index d4ba680..beb2aad 100644
--- a/libunwindstack/Memory.cpp
+++ b/libunwindstack/Memory.cpp
@@ -345,6 +345,25 @@
return memory_->Read(addr, dst, size);
}
+MemoryOfflineBuffer::MemoryOfflineBuffer(const uint8_t* data, uint64_t start, uint64_t end)
+ : data_(data), start_(start), end_(end) {}
+
+void MemoryOfflineBuffer::Reset(const uint8_t* data, uint64_t start, uint64_t end) {
+ data_ = data;
+ start_ = start;
+ end_ = end;
+}
+
+size_t MemoryOfflineBuffer::Read(uint64_t addr, void* dst, size_t size) {
+ if (addr < start_ || addr >= end_) {
+ return 0;
+ }
+
+ size_t read_length = std::min(size, static_cast<size_t>(end_ - addr));
+ memcpy(dst, &data_[addr - start_], read_length);
+ return read_length;
+}
+
MemoryOfflineParts::~MemoryOfflineParts() {
for (auto memory : memories_) {
delete memory;