[lldb] Add a compiler/interpreter of LLDB data formatter bytecode to lldb/examples (#113398)

This PR adds a proof-of-concept for a bytecode designed to ship and run
LLDB data formatters. More motivation and context can be found in the
`formatter-bytecode.md` file and on discourse.

https://discourse.llvm.org/t/a-bytecode-for-lldb-data-formatters/82696

1 files changed, 23 insertions, 0 deletions

diff --git a/lldb/test/Shell/ScriptInterpreter/Python/Inputs/FormatterBytecode/MyOptional.cpp b/lldb/test/Shell/ScriptInterpreter/Python/Inputs/FormatterBytecode/MyOptional.cpp
new file mode 100644
index 000000000000..abba34439d88
--- /dev/null
+++ b/lldb/test/Shell/ScriptInterpreter/Python/Inputs/FormatterBytecode/MyOptional.cpp
@@ -0,0 +1,23 @@
+// A bare-bones llvm::Optional reimplementation.
+
+template <typename T> struct MyOptionalStorage {
+  MyOptionalStorage(T val) : value(val), hasVal(true) {}
+  MyOptionalStorage() {}
+  T value;
+  bool hasVal = false;
+};
+
+template <typename T> struct MyOptional {
+  MyOptionalStorage<T> Storage;
+  MyOptional(T val) : Storage(val) {}
+  MyOptional() {}
+  T &operator*() { return Storage.value; }
+};
+
+void stop() {}
+
+int main(int argc, char **argv) {
+  MyOptional<int> x, y = 42;
+  stop(); // break here
+  return *y;
+}