| 1 | //===-- ReadMemoryRequestHandler.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 "DAP.h" |
| 10 | #include "JSONUtils.h" |
| 11 | #include "RequestHandler.h" |
| 12 | #include "llvm/ADT/StringExtras.h" |
| 13 | |
| 14 | namespace lldb_dap { |
| 15 | |
| 16 | // Reads bytes from memory at the provided location. |
| 17 | // |
| 18 | // Clients should only call this request if the corresponding capability |
| 19 | // `supportsReadMemoryRequest` is true |
| 20 | llvm::Expected<protocol::ReadMemoryResponseBody> |
| 21 | ReadMemoryRequestHandler::Run(const protocol::ReadMemoryArguments &args) const { |
| 22 | const lldb::addr_t raw_address = args.memoryReference + args.offset; |
| 23 | |
| 24 | lldb::SBProcess process = dap.target.GetProcess(); |
| 25 | if (!lldb::SBDebugger::StateIsStoppedState(state: process.GetState())) |
| 26 | return llvm::make_error<NotStoppedError>(); |
| 27 | |
| 28 | const uint64_t count_read = std::max<uint64_t>(a: args.count, b: 1); |
| 29 | // We also need support reading 0 bytes |
| 30 | // VS Code sends those requests to check if a `memoryReference` |
| 31 | // can be dereferenced. |
| 32 | protocol::ReadMemoryResponseBody response; |
| 33 | std::vector<std::byte> &buffer = response.data; |
| 34 | buffer.resize(new_size: count_read); |
| 35 | |
| 36 | lldb::SBError error; |
| 37 | const size_t memory_count = dap.target.GetProcess().ReadMemory( |
| 38 | addr: raw_address, buf: buffer.data(), size: buffer.size(), error); |
| 39 | |
| 40 | response.address = raw_address; |
| 41 | |
| 42 | // reading memory may fail for multiple reasons. memory not readable, |
| 43 | // reading out of memory range and gaps in memory. return from |
| 44 | // the last readable byte. |
| 45 | if (error.Fail() && (memory_count < count_read)) { |
| 46 | response.unreadableBytes = count_read - memory_count; |
| 47 | } |
| 48 | |
| 49 | buffer.resize(new_size: std::min<size_t>(a: memory_count, b: args.count)); |
| 50 | return response; |
| 51 | } |
| 52 | |
| 53 | } // namespace lldb_dap |
| 54 |