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passes: implement control-flow pass (4 schemes + rotation)

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FlowPass rebuilds one method per scheme picked from FlowConfig:
state-spread (dense tableswitch dispatcher), computed-switch
(sparse lookupswitch over a counter local), butterfly (branch
inversion), exception-goto (dispatcher under try with a dead
catch-all), plus opaque goto-splices inside every method and
StackMapTable recomputation afterwards. Now in standard_pipeline
(between constants and noise); --no-flow is an honest off-flag.

Acceptance is real JVM, not shapes: per-scheme verify, rotation
spread, calc-prints-45 execution, paranoid smoke on lorep-1.1.0
(131 methods rebuilt, no new failures over standard).

Two verifier rules learned the hard way are now construction
invariants: no inserted mark shares a bytecode offset with a
foreign one (nop pads), and no frameless gap follows a terminal
(dead blocks are opaque-entered and throw).

Also fixes a latent frame-emitter bug the pass exposed: wide
stack values were written as slot pairs ([Double, Top]) while
javac writes one entry ([Double]); HotSpot rejects the pair.
Stacks now collapse like locals (emit::stack_vars), with a
regression test in classfile/tests/frames.rs.
This commit is contained in:
Loki 2026-10-09 11:11:55 +02:00
parent 39178420e4
commit 2172206e83
Signed by: boba
GPG key ID: 253067914055423B
15 changed files with 1360 additions and 103 deletions
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2
docs/learnings/lessons.md
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@ -14,7 +14,7 @@
| 1 | ключ лежит рядом с шифротекстом | вывод мастер-секрета в декодере, ключ из `master‖salt` | Strings | **готово** |
| 2 | переименованы типы, но не члены | rename полей/методов + семейства virtual | Rename | **готово** |
| 3 | отладочная информация нетронута | strip + ложный `SourceFile`/номера строк | DebugInfo | **готово** (`SourceFile`; номера строк — план) |
| 4 | шаблонный flattening | 4 схемы CFG + мешанина внутри метода | Flow | план (кадры готовы) |
| 4 | шаблонный flattening | 4 схемы CFG + мешанина внутри метода | Flow | **готово** (4 схемы, приёмка `java`) |
| 5 | opaque-предикаты = `A+B` | ротация тождеств + предикаты от состояния | Constants | **готово** (int/long) |
| 6 | junk-классы вне графа reachability | `weave_reachable` — обязательная вплетённость | Noise | **готово** (без аннотаций) |
| 7 | имена говорят «я защита» | все артефакты получают данные псевдонимы | Rename | **готово** |