feat(vm): Android emulator foundation with const-return demo (2)#4
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haeter525 wants to merge 3 commits into
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feat(vm): Android emulator foundation with const-return demo (2)#4haeter525 wants to merge 3 commits into
haeter525 wants to merge 3 commits into
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Lays down the Dalvik interpreter scaffolding (primitives + engine loop)
with the absolute minimum handler (`move` only — covers const-* opcodes)
and an empty android_stubs registry. Engine wiring for the remaining
handlers and stub modules is held back behind explicit "scaffold:
re-enable in follow-up" comments so the next PRs become pure additions.
End-to-end demo: const_return.dex (one `const/16` + one `return`) runs
through the engine and produces 42.
Primitives (src/dextrace/vm/):
- decoder, register_file, state, call_frame, signals, errors, int_ops
- heap, class_hierarchy, trace
- engine.py (~900 LoC interpreter loop)
- handlers/__init__.py, handlers/move.py (only handler shipped)
- android_stubs/__init__.py (REGISTRY/types only; stub modules deferred)
Supporting:
- core/dex_class_iter.py (used by class_hierarchy)
- dalvik/payload.py: PackedSwitchTable / SparseSwitchTable /
FillArrayDataTable decoders (consumed by engine for switch + array ops)
Tests (117 passing):
- tests/vm/test_{register_file,int_ops,heap,class_hierarchy,
class_hierarchy_subtype,switch_payload}.py — primitive unit tests
- tests/test_vm_run_const_return.py — Python-API end-to-end (CLI
variants land alongside cli/cmd_run.py in the CLI PR)
Held back for follow-up PRs:
- handlers/{arithmetic,array,branch,compare,field,throw,
type_check,type_conv}.py — engine has matching scaffold markers
at each import + register() site
- android_stubs/{sms,text,intent,telephony,network,runtime,
filesystem,content}.py — package __init__ has matching marker
- Integration tests that need full handlers / stubs / CLI
Verification (one-liner):
pytest tests/test_vm_run_const_return.py -q
Full scaffold suite:
pytest -q # 117 passed
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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haeter525
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This was referenced May 21, 2026
haeter525
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Drop P1/P4/P5a-f and OV-1..OV-6 references from inline comments — the codenames are noise without the design doc next to them. Also remove the empty stub-bootstrap block in android_stubs since stub modules will re-add it when they land. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Lays down the Android emulator foundation with a const-return demo.
Scope
Foundation (
src/dextrace/vm/):decoder,register_file,state,call_frame,signals,errors,int_opsheap,class_hierarchy,traceengine.py(~900 LoC interpreter loop)handlers/__init__.py,handlers/move.py(only handler shipped)android_stubs/__init__.py(REGISTRY/types only; stub modules deferred)Supporting:
core/dex_class_iter.py— used byclass_hierarchydalvik/payload.py—PackedSwitchTable/SparseSwitchTable/FillArrayDataTabledecoders (consumed by engine for switch + array ops)Tests (117 passing):
tests/vm/— unit teststests/test_vm_run_const_return.py— Python-API end-to-end testsOne-line verification