Debugger Woes Tracking Issue

[iwillspeak]

Our current debugger support is a bit rough around the edges.

• Bound tree contains sequence points for debuging
• Debuggable REPL. Embedded source in PDBs?
• Stop at entry, and step in.
• Inferred (nop based) sequence points for debug builds. (DisableSymbolStoreSequencePoints)
• No symbol information for local names, or environment slots.
• Better lambda names. e.g. foo_1::bar_0 not lambda1::lambda0 if (define (foo ..)) forms are used.

[iwillspeak]

symbol names could be attached to storage when a new storage is alloccated by the binder context, or we could keep a mapping from storage to name hint. When emitting debug information later we could just inspect this mapping.

The latter would provide two advantages:

• we don't have to store the name with the storage each time it is referenced
• We can re-write the storage -> name mapping more easily in lower.
• We can store name information for storage other than locals here too.