Feat/memory tracing - #125
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RaoulSchaffranek wants to merge 3 commits into
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Debuggers need linear memory to resolve Rust variables that live in the shadow
stack (the majority at -O0, e.g. any fbreg-located local or parameter). Extend
the instruction trace record with a `mem` field: a full sparse snapshot of the
current module's linear memory, emitted only when it changed since the previous
snapshot (a `<prevMem>` cell holds the last one), else `null`.
The snapshot is a JSON array of `{ "addr", "bytes" }` runs — one per concrete
SparseBytes chunk, `bytes` lowercase hex via the Bytes2Hex hook — so only
written regions are carried; a consumer folds the most recent snapshot at or
before a step and treats unwritten bytes as 0. A `[traceInstr-nomem]` fallback
keeps tracing total for programs with no linear memory.
test_memory_tracing.py deploys the increment example and asserts the field is
present, snapshots are emitted on change (and omitted otherwise), and the folded
image is consistent.
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