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[PR #2696] [CLOSED] fix(dotnet): name the instruction when a truncated operand leaves the method body #5319

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opened 2026-10-31 01:05:42 +00:00 by bsakaguchi · 0 comments

bsakaguchi commented

2026-10-31 01:05:42 +00:00

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📋 Pull Request Information

Original PR: https://github.com/morluto/rea/pull/2696
Author: @aftabkh4n
Created: 10/13/2026
Status: ❌ Closed

Base: main ← Head: fix/dotnet-truncated-operand-diagnostic

📝 Commits (4)

10a3de5 fix(dotnet): name the instruction when a truncated operand leaves the method body
f194d9c chore: merge main and resolve PR #2696 conflicts
6462483 chore: merge captured main into PR #2696
153bba4 Merge branch 'main' into fix/dotnet-truncated-operand-diagnostic

📊 Changes

2 files changed (+104 additions, -84 deletions)

View changed files

📝 src/dotnet/ManagedCilDecoding.test.ts (+8 -0)
📝 src/dotnet/ManagedMemberInstructionDecoder.ts (+96 -84)

📄 Description

Summary

Fixes #2677. When a managed method's last instruction has an incomplete operand, body.issue reported a raw Node Buffer error instead of the decoder's existing format diagnostic, losing the opcode and IL offset.

Problem and expected behavior

Smallest trigger: a tiny method body whose one IL byte is ldc.i4 (0x20) with no operand. Before: "issue": "Attempt to access memory outside buffer bounds" (or The value of "offset" is out of range… for 1-byte operands). Expected: "Instruction ldc.i4 at IL offset 0 leaves method body", with status: "malformed", the decoded prefix, and a null normalized hash unchanged.

Change and scope

The producing boundary is readOperand in ManagedMemberInstructionDecoder.ts. Each fixed-width operand reader now declares its width, and switch counts and metadata tokens check their 4 bytes, so a short operand is detected before any read and routed to the existing "leaves method body" diagnostic. A two-byte opcode truncated after its 0xfe prefix gets the same treatment. The generic catch remains for unrelated failures. Out of scope: other wording in body.issue.

Contribution scope: ordinary fix within existing boundaries; maintainer scope decision not applicable.

Contract and boundary impact

Semantic owner and earliest changed stage: src/dotnet/ManagedMemberInstructionDecoder.ts, operand decoding.
Contribution scope fit and linked maintainer decision: in scope (static format inspection); not applicable.
CLI and MCP/tool-catalog contract: no schema change; only the body.issue text for truncated operands changes.
Provider, bridge, target-format, or platform compatibility: none.
Evidence, artifact, provenance, or reconstruction contract: malformed status, decoded prefix, and null normalized IL hash preserved.
Target selection, authority, upstream behavior, and cleanup details: not applicable.
Generated metadata, package, or installation impact: none.
Read existing files or captured data.

Evidence and regression coverage

Tests added or updated: src/dotnet/ManagedCilDecoding.test.ts, "managed CIL operand truncation": truncated ldc.i4 (alone and after nop, which is kept), br.s, ldloc, a switch count, and a two-byte opcode prefix.
Base reproduction: on the base revision all 6 cases fail with the raw Buffer/RangeError messages reported in the issue; with the fix they pass.
User-visible CLI/MCP output: body.issue now reads e.g. Instruction ldc.i4 at IL offset 0 leaves method body.
Remaining proof gaps: CLI/MCP transport not executed end to end; covered through inspectManagedMembersBytes, the production entry the provider uses.
Unsupported, incomplete, unavailable, or uncertain outcomes remain visible.

Validation performed

npm run test:local -- src/dotnet/ManagedCilDecoding.test.ts: 33 passed (6 failed before the fix)
npm run test:local -- src/dotnet/*.test.ts: 11 files, 189 tests passed
npm run check:fast: typecheck and lint pass
npm run verify:test-discovery: all 1037 test files discovered once

Compatibility, safety, and release

Breaking changes or migration steps: none.
Real Hopper/Ghidra, browser, or OS coverage: not applicable (pure static decoder).
Package or release metadata impact: none.
Security, privacy, process, or containment review: no new target interaction; bounds are checked before reads.

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.

_{🔄 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/2696 **Author:** [@aftabkh4n](https://github.com/aftabkh4n) **Created:** 10/13/2026 **Status:** ❌ Closed **Base:** `main` ← **Head:** `fix/dotnet-truncated-operand-diagnostic` --- ### 📝 Commits (4) - [`10a3de5`](https://github.com/morluto/rea/commit/10a3de5a855a4be63da522bbb4de26bbc7eface4) fix(dotnet): name the instruction when a truncated operand leaves the method body - [`f194d9c`](https://github.com/morluto/rea/commit/f194d9c02f41d7cba04c22f4c571a571ec18513f) chore: merge main and resolve PR #2696 conflicts - [`6462483`](https://github.com/morluto/rea/commit/646248334a6c9c60ca9546aedcbcdddc1609d0de) chore: merge captured main into PR #2696 - [`153bba4`](https://github.com/morluto/rea/commit/153bba4e980597b2e0778e07258b2d15b5606d53) Merge branch 'main' into fix/dotnet-truncated-operand-diagnostic ### 📊 Changes **2 files changed** (+104 additions, -84 deletions) <details> <summary>View changed files</summary> 📝 `src/dotnet/ManagedCilDecoding.test.ts` (+8 -0) 📝 `src/dotnet/ManagedMemberInstructionDecoder.ts` (+96 -84) </details> ### 📄 Description ## Summary Fixes #2677. When a managed method's last instruction has an incomplete operand, `body.issue` reported a raw Node Buffer error instead of the decoder's existing format diagnostic, losing the opcode and IL offset. ## Problem and expected behavior Smallest trigger: a tiny method body whose one IL byte is `ldc.i4` (`0x20`) with no operand. Before: `"issue": "Attempt to access memory outside buffer bounds"` (or `The value of "offset" is out of range…` for 1-byte operands). Expected: `"Instruction ldc.i4 at IL offset 0 leaves method body"`, with `status: "malformed"`, the decoded prefix, and a null normalized hash unchanged. ## Change and scope The producing boundary is `readOperand` in `ManagedMemberInstructionDecoder.ts`. Each fixed-width operand reader now declares its width, and switch counts and metadata tokens check their 4 bytes, so a short operand is detected before any read and routed to the existing "leaves method body" diagnostic. A two-byte opcode truncated after its `0xfe` prefix gets the same treatment. The generic catch remains for unrelated failures. Out of scope: other wording in `body.issue`. Contribution scope: ordinary fix within existing boundaries; maintainer scope decision not applicable. ## Contract and boundary impact - Semantic owner and earliest changed stage: `src/dotnet/ManagedMemberInstructionDecoder.ts`, operand decoding. - Contribution scope fit and linked maintainer decision: in scope (static format inspection); not applicable. - CLI and MCP/tool-catalog contract: no schema change; only the `body.issue` text for truncated operands changes. - Provider, bridge, target-format, or platform compatibility: none. - Evidence, artifact, provenance, or reconstruction contract: malformed status, decoded prefix, and null normalized IL hash preserved. - Target selection, authority, upstream behavior, and cleanup details: not applicable. - Generated metadata, package, or installation impact: none. - [x] Read existing files or captured data. ## Evidence and regression coverage - Tests added or updated: `src/dotnet/ManagedCilDecoding.test.ts`, "managed CIL operand truncation": truncated `ldc.i4` (alone and after `nop`, which is kept), `br.s`, `ldloc`, a `switch` count, and a two-byte opcode prefix. - Base reproduction: on the base revision all 6 cases fail with the raw Buffer/RangeError messages reported in the issue; with the fix they pass. - User-visible CLI/MCP output: `body.issue` now reads e.g. `Instruction ldc.i4 at IL offset 0 leaves method body`. - Remaining proof gaps: CLI/MCP transport not executed end to end; covered through `inspectManagedMembersBytes`, the production entry the provider uses. - [x] Unsupported, incomplete, unavailable, or uncertain outcomes remain visible. ## Validation performed - `npm run test:local -- src/dotnet/ManagedCilDecoding.test.ts`: 33 passed (6 failed before the fix) - `npm run test:local -- src/dotnet/*.test.ts`: 11 files, 189 tests passed - `npm run check:fast`: typecheck and lint pass - `npm run verify:test-discovery`: all 1037 test files discovered once ## Compatibility, safety, and release - Breaking changes or migration steps: none. - Real Hopper/Ghidra, browser, or OS coverage: not applicable (pure static decoder). - Package or release metadata impact: none. - Security, privacy, process, or containment review: no new target interaction; bounds are checked before reads. ## 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. - [x] Owning docs, contracts, and generated metadata are updated where needed. - [x] User-visible CLI/MCP changes include representative output. - [x] I checked the final diff for secrets, unrelated cleanup, and unsupported claims. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

bsakaguchi

2026-10-31 01:05:42 +00:00

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bsakaguchi referenced this issue

2026-10-31 01:11:53 +00:00

[PR #4163] feat(analysis-view): page retained browser scenario steps and text #6103

bsakaguchi referenced this issue

2026-11-01 21:43:45 +00:00

[PR #5319] [MERGED] feat(environment): extract the initial state a capture's reads observed #6877

bsakaguchi referenced this issue

2026-11-01 21:43:51 +00:00

[PR #5351] [MERGED] feat(environment)!: serve the environment state by default #6888

bsakaguchi referenced this issue

2026-11-01 21:43:51 +00:00

[PR #5352] [MERGED] feat(environment): render more read tools from the state and describe responses #6889

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