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[PR #6646] [CLOSED] fix(python): decode backward-compatible TYPE_INT64 marshal constants #7385

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opened 2026-11-01 21:47:29 +00:00 by bsakaguchi · 0 comments

bsakaguchi commented

2026-11-01 21:47:29 +00:00

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📋 Pull Request Information

Original PR: https://github.com/morluto/rea/pull/6646
Author: @ezrabrilliant
Created: 10/23/2026
Status: ❌ Closed

Base: main ← Head: fix/pyc-type-int64

📝 Commits (1)

2e7e248 fix(python): decode backward-compatible TYPE_INT64 marshal constants

📊 Changes

2 files changed (+36 additions, -0 deletions)

View changed files

📝 src/python/PythonPycParser.test.ts (+22 -0)
📝 src/python/PythonPycParser.ts (+14 -0)

📄 Description

Summary

Fixes #6609. The inspect-python-pyc command rejected a pyc whose integer
constant uses the backward-compatible marshal TYPE_INT64 tag (0x49) with
invalid_format / Unsupported marshal type 0x49., even though CPython retains
the r_long64 reader. Encoding the same integer with TYPE_INT decodes with
complete coverage.

Problem and expected behavior

Smallest trigger: a CPython 3.11-layout pyc whose constant is integer 42
encoded as TYPE_INT64 (0x49 followed by an 8-byte little-endian value).
Observed: the marshal reader has no TYPE_INT64 case, so it falls through to
Unsupported marshal type 0x49.. Expected: decode it like TYPE_INT, yielding
{"kind":"int","bits":6,"value":"42"}. CPython 3.11/3.13 sources keep the
TYPE_INT64 reader for backward compatibility.

Change and scope

Add the TYPE_INT64 tag and an i64() reader that decodes an 8-byte
little-endian signed integer (readBigInt64LE), returning the same
{ kind: "int", value, bits } shape as TYPE_INT via smallBitLength. The
reader mirrors the existing i32()/f64() bounds checks. No schema or contract
change; this only admits a marshal tag CPython already accepts.

Contract and boundary impact

Semantic owner and earliest changed stage: MarshalReader in
src/python/PythonPycParser.ts, at marshal constant decoding.
Contribution scope fit and linked maintainer decision: ordinary fix within an
existing boundary; no maintainer scope decision required (not applicable).
CLI and MCP/tool-catalog contract: no schema change. A TYPE_INT64 constant
now decodes to an int instead of returning invalid_format.
Provider, bridge, target-format, or platform compatibility: none.
Evidence, artifact, provenance, or reconstruction contract: none; adds
coverage for a retained CPython marshal type.
Target selection, authority, upstream behavior, and cleanup details: not applicable.
Generated metadata, package, or installation impact: none.
Read existing files or captured data.
Launch or attach to a process.
Inject instrumentation or run scripts/code.
Change process memory, registers, files, or configuration.
Contact network services.
Recover protected code or work around protections.
Documentation or usability only; no target interaction.
Not sure yet; investigation or maintainer guidance needed.

Evidence and regression coverage

Tests added or updated: src/python/PythonPycParser.test.ts — new case
"accepts backward-compatible TYPE_INT64 marshal integer constants" covering a
small value (42), a value with its high 32 bits set (0x1_0000_002a, proving
the full 64-bit width is read), and a negative value (-5).
Base reproduction (executed): with the parser change stashed, the new test
fails with PythonPycFormatFailure: Unsupported marshal type 0x49.; with the
fix it decodes { kind: "int", bits: 6, value: "42" } and the 33-bit and
negative cases.
User-visible CLI/MCP output: a TYPE_INT64 constant now appears as an int
constant instead of an AnalysisInputError (invalid_format). The
parser-to-service mapping is source-derived (PythonPycService); the full CLI
was not executed.
Remaining proof gaps: no end-to-end CLI JSON captured; validated against a
synthetic fixture, not a CPython-produced TYPE_INT64 file.
Observed, derived, and inferred claims remain distinguishable.
Artifact identity, source provenance, and failed attempts remain preserved.
Unsupported, incomplete, unavailable, or uncertain outcomes remain visible.

Validation performed

npm run test:local -- src/python/PythonPycParser.test.ts src/application/python/PythonPycService.test.ts src/artifacts/pyinstaller/MarshalSubset.test.ts — 63 passed (incl. new regression).
Base reproduction: same command with the parser change stashed — the new test fails with Unsupported marshal type 0x49.
npm run check:fast — typecheck + lint: 2 tasks successful.

Compatibility, safety, and release

Breaking changes or migration steps: none. Previously rejected TYPE_INT64
inputs now decode; no existing accepted input changes.
Real Hopper/Ghidra, browser, or OS coverage: not applicable.
Package or release metadata impact: none.
Security, privacy, process, or containment review: none; pure parser decode
addition, no target execution.

Author readiness

Human owner: @ezrabrilliant

I reviewed the final diff and relevant existing code, understand the change and its edge cases, and take responsibility for the complete PR, including AI-assisted work.
I checked the evidence above, confirmed it supports the current change, and recorded meaningful validation gaps.
I declare this PR ready for initial maintainer review.

Before merge

This PR addresses a concrete problem or an agreed enhancement.
Material scope and authority questions are resolved, and any required maintainer scope decision covers the final diff.
The PR has one focused outcome and the title follows type(scope): outcome.
Related issue is linked, or the reason for not linking one is stated above.
Tests cover changed observable behavior and meaningful failure paths.
Owning docs, contracts, and generated metadata are updated where needed.
User-visible CLI/MCP changes include representative output.
I checked the final diff for secrets, unrelated cleanup, and unsupported claims.

🤖 Generated with Claude Code

https://claude.ai/code/session_01VkKgC2HYpt7rG38FnoufT1

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/morluto/rea/pull/6646 **Author:** [@ezrabrilliant](https://github.com/ezrabrilliant) **Created:** 10/23/2026 **Status:** ❌ Closed **Base:** `main` ← **Head:** `fix/pyc-type-int64` --- ### 📝 Commits (1) - [`2e7e248`](https://github.com/morluto/rea/commit/2e7e248a27d6059c94fc7ebddfebe60e0b720654) fix(python): decode backward-compatible TYPE_INT64 marshal constants ### 📊 Changes **2 files changed** (+36 additions, -0 deletions) <details> <summary>View changed files</summary> 📝 `src/python/PythonPycParser.test.ts` (+22 -0) 📝 `src/python/PythonPycParser.ts` (+14 -0) </details> ### 📄 Description ## Summary Fixes #6609. The `inspect-python-pyc` command rejected a pyc whose integer constant uses the backward-compatible marshal `TYPE_INT64` tag (`0x49`) with `invalid_format` / `Unsupported marshal type 0x49.`, even though CPython retains the `r_long64` reader. Encoding the same integer with `TYPE_INT` decodes with complete coverage. ## Problem and expected behavior Smallest trigger: a CPython 3.11-layout pyc whose constant is integer `42` encoded as `TYPE_INT64` (`0x49` followed by an 8-byte little-endian value). Observed: the marshal reader has no `TYPE_INT64` case, so it falls through to `Unsupported marshal type 0x49.`. Expected: decode it like `TYPE_INT`, yielding `{"kind":"int","bits":6,"value":"42"}`. CPython 3.11/3.13 sources keep the `TYPE_INT64` reader for backward compatibility. ## Change and scope Add the `TYPE_INT64` tag and an `i64()` reader that decodes an 8-byte little-endian signed integer (`readBigInt64LE`), returning the same `{ kind: "int", value, bits }` shape as `TYPE_INT` via `smallBitLength`. The reader mirrors the existing `i32()`/`f64()` bounds checks. No schema or contract change; this only admits a marshal tag CPython already accepts. ## Contract and boundary impact - Semantic owner and earliest changed stage: `MarshalReader` in `src/python/PythonPycParser.ts`, at marshal constant decoding. - Contribution scope fit and linked maintainer decision: ordinary fix within an existing boundary; no maintainer scope decision required (not applicable). - CLI and MCP/tool-catalog contract: no schema change. A `TYPE_INT64` constant now decodes to an `int` instead of returning `invalid_format`. - Provider, bridge, target-format, or platform compatibility: none. - Evidence, artifact, provenance, or reconstruction contract: none; adds coverage for a retained CPython marshal type. - Target selection, authority, upstream behavior, and cleanup details: not applicable. - Generated metadata, package, or installation impact: none. - [x] Read existing files or captured data. - [ ] Launch or attach to a process. - [ ] Inject instrumentation or run scripts/code. - [ ] Change process memory, registers, files, or configuration. - [ ] Contact network services. - [ ] Recover protected code or work around protections. - [ ] Documentation or usability only; no target interaction. - [ ] Not sure yet; investigation or maintainer guidance needed. ## Evidence and regression coverage - Tests added or updated: `src/python/PythonPycParser.test.ts` — new case "accepts backward-compatible TYPE_INT64 marshal integer constants" covering a small value (`42`), a value with its high 32 bits set (`0x1_0000_002a`, proving the full 64-bit width is read), and a negative value (`-5`). - Base reproduction (executed): with the parser change stashed, the new test fails with `PythonPycFormatFailure: Unsupported marshal type 0x49.`; with the fix it decodes `{ kind: "int", bits: 6, value: "42" }` and the 33-bit and negative cases. - User-visible CLI/MCP output: a `TYPE_INT64` constant now appears as an `int` constant instead of an `AnalysisInputError` (`invalid_format`). The parser-to-service mapping is source-derived (`PythonPycService`); the full CLI was not executed. - Remaining proof gaps: no end-to-end CLI JSON captured; validated against a synthetic fixture, not a CPython-produced `TYPE_INT64` file. - [x] Observed, derived, and inferred claims remain distinguishable. - [x] Artifact identity, source provenance, and failed attempts remain preserved. - [x] Unsupported, incomplete, unavailable, or uncertain outcomes remain visible. ## Validation performed - `npm run test:local -- src/python/PythonPycParser.test.ts src/application/python/PythonPycService.test.ts src/artifacts/pyinstaller/MarshalSubset.test.ts` — 63 passed (incl. new regression). - Base reproduction: same command with the parser change stashed — the new test fails with `Unsupported marshal type 0x49.` - `npm run check:fast` — typecheck + lint: 2 tasks successful. ## Compatibility, safety, and release - Breaking changes or migration steps: none. Previously rejected `TYPE_INT64` inputs now decode; no existing accepted input changes. - Real Hopper/Ghidra, browser, or OS coverage: not applicable. - Package or release metadata impact: none. - Security, privacy, process, or containment review: none; pure parser decode addition, no target execution. ## Author readiness Human owner: @ezrabrilliant - [x] I reviewed the final diff and relevant existing code, understand the change and its edge cases, and take responsibility for the complete PR, including AI-assisted work. - [x] I checked the evidence above, confirmed it supports the current change, and recorded meaningful validation gaps. - [x] I declare this PR ready for initial maintainer review. ## Before merge - [x] This PR addresses a concrete problem or an agreed enhancement. - [x] Material scope and authority questions are resolved, and any required maintainer scope decision covers the final diff. - [x] The PR has one focused outcome and the title follows `type(scope): outcome`. - [x] Related issue is linked, or the reason for not linking one is stated above. - [x] Tests cover changed observable behavior and meaningful failure paths. - [ ] Owning docs, contracts, and generated metadata are updated where needed. - [ ] User-visible CLI/MCP changes include representative output. - [x] I checked the final diff for secrets, unrelated cleanup, and unsupported claims. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_01VkKgC2HYpt7rG38FnoufT1 --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

bsakaguchi

2026-11-01 21:47:29 +00:00

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