================
@@ -742,6 +742,42 @@ bool fromJSON(const llvm::json::Value &, 
DisassembledInstruction &,
               llvm::json::Path);
 llvm::json::Value toJSON(const DisassembledInstruction &);
 
+/// Arguments for `readMemory` request.
+struct ReadMemoryArguments {
+  /// Memory reference to the base location from which data should be read.
+  std::string memoryReference;
+
+  /// Offset (in bytes) to be applied to the reference location before reading
+  /// data. Can be negative.
+  std::optional<int64_t> offset;
+
+  /// Number of bytes to read at the specified location and offset.
+  uint64_t count;
+};
+bool fromJSON(const llvm::json::Value &, ReadMemoryArguments &,
+              llvm::json::Path);
+
+/// Response to `readMemory` request.
+struct ReadMemoryResponse {
+  /// The address of the first byte of data returned.
+  /// Treated as a hex value if prefixed with `0x`, or as a decimal value
+  /// otherwise.
+  std::string address;
+
+  /// The number of unreadable bytes encountered after the last successfully
+  /// read byte.
+  /// This can be used to determine the number of bytes that should be skipped
+  /// before a subsequent `readMemory` request succeeds.
+  std::optional<uint64_t> unreadableBytes;
----------------
ashgti wrote:

Can we default to 0 and make this not optional?

https://github.com/llvm/llvm-project/pull/144552
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