[DavidCozens]

Closes #1057

What changed

• The record Service works on moves out of struct SolidSyslog into a static array of one row per pool entry, defined in the branch of SolidSyslog_Create that hands a slot out (MISRA 8.9, cppcheck variableScope). Each instance holds a pointer to its row and the row's capacity, which Create passes in through SolidSyslog_Initialise.
• Cleanup leaves the pointer NULL and the capacity 0. Destroy and the exhaustion fallback both go through Cleanup, so the fallback carries no slot. Cleanup installs the Null buffer and store in the same step, so a NULL slot never meets a Read that could write into it.
• Service bounds its buffer and store reads by RecordCapacity instead of sizeof(self->Record).
• The SOLIDSYSLOG_POOL_SIZE doc comment says each instance costs a record slot. "A small bookkeeping struct" had been stale since refactor: S43.06 Service holds a record it has taken from the buffer until it has dealt with it #1019.

No behaviour changes.

RAM

Measured with size on the gcc debug build (x86-64) at the default 480 B cap: .bss in SolidSyslogStatic.c.o falls from 1,305 B to 897 B. The figure includes the host's alignment padding, which accounts for 24 B of the difference between the file-scope and block-scope placements of the array. Each pool entry gains a pointer and a size_t (16 B on a 64-bit target, 8 B on 32-bit), against a whole record slot removed from the fallback.

The fallback's slot was accepted as a cost in #1019. The 0.3.0 dry run of the example then put it at 508 B of the 1,132 B above baseline at the logger stage.

Tests

• New EachInstanceHoldsItsOwnRecord in SolidSyslogServiceHeldRecordTest.cpp: two pooled instances each hold a record for a down sender, and each one's retry sends its own record. CHECK_RETRY_SENT counts each sender's calls, so the test cannot pass if the second Create lands on the fallback or if a retry sends nothing. At pool size 1 (debug) it exits, following the existing two-instance tests. It runs under tunable-override-debug (pool size 3), which is CI's unit lane.
• Mutation check: pointing every pool entry at row 0 turns it red ("expected first, but was other"), and no other test fails.
• The existing Service, held-record and pool tests guard the rest of the refactor.

Review findings

A whole-branch review before the first push raised seven findings. Four are fixed: the two gaps in the new test above, the slot comment not saying what Create and Cleanup now do with the storage, and TunableOverrides.h not naming the test the pool size enables.

Three are declined:

• RecordCapacity could be derived from whether Record is NULL. It is kept because NULL paired with the message cap would be a false bound, while NULL paired with 0 is a true one.
• The fallback is safe only because Cleanup installs the Null buffer and store alongside the NULL slot. That holds within one function, and FallbackLogSilentlyDropsTheMessage runs Service on the fallback. A 1-byte static with capacity 0 would remove the dependency, if that is preferred.
• docs/hardening-path.md says "the record slot in the instance". That is still true at the level the page speaks, one slot per instance, and the page is being rewritten under docs: bring the documentation up to date for 0.3.0 #1055.

CI round 1: the cppcheck lane flagged MISRA 8.9 on the array at file scope, and it moved into SolidSyslog_Create. CodeRabbit's one finding, that the test checked only the first instance's retry, is fixed.

CI round 2: cppcheck's variableScope asked for a narrower scope still, and the array moved into the branch of SolidSyslog_Create that hands a slot out. The build-time cppcheck pass was run locally before that push.

Follows from this

The stage 3 cost in docs/hardening-path.md, as rewritten for #1055, should count one record slot rather than two.

Testing

• gcc debug and tunable-override-debug unit suites: 1,895 tests pass in each.
• clang-format clean on the touched files. The MISRA suppressions are renumbered from the diff: ten D.006 entries in SolidSyslog.c, each checked against its line.
• CI covers the rest: tidy, sanitize, coverage, Windows, BDD, FreeRTOS and VxWorks.

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• Core/Source/SolidSyslogStatic.c

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Walkthrough

Record buffers now use separate static storage for pool entries. Each logger stores its buffer pointer and capacity, and record reads use that capacity. A new test checks that two logger instances can hold and retry separate failed records.

Changes

Record storage

Layer / File(s)	Summary
Pool-entry record storage Core/Source/SolidSyslogPrivate.h, Core/Source/SolidSyslogStatic.c, Core/Interface/SolidSyslogTunablesDefaults.h	SolidSyslog stores a record pointer and capacity. SolidSyslog_Create assigns each acquired pool entry its corresponding static record buffer. The pool-size documentation describes the per-entry record storage.
Record lifecycle and reads Core/Source/SolidSyslog.c, misra_suppressions.txt	Initialisation sets the record buffer and capacity. Reset clears both. Buffer and store reads use the configured capacity. The MISRA suppression line references were renumbered; the suppression rules are unchanged.
Two-instance held-record test Tests/SolidSyslogServiceHeldRecordTest.cpp, Tests/Fixtures/TunableOverrides.h	The fixture creates a second logger with a separate buffer and sender. The test checks failed sends on both instances and verifies that each sender receives its own held record. The fixture comment describes the test's pool-size requirement.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~15 minutes

Change: Refactor

Possibly related issues

• cososo-ltd/solid-syslog#1055: The issue requires documentation to match the implementation's RAM model. This change updates the pool-size comment but does not update the hardening-path cost statements.

Merge Risk: ⚪ Minimal · up to fe914

The storage change preserves per-instance record handling and retry behavior, with no merge-blocking risk identified.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title is concise, uses Conventional Commits format, and accurately describes the main change: the Null SolidSyslog instance no longer carries a record slot.
Linked Issues check		[#1057] The current implementation removes the record slot from the fallback. SolidSyslog_Create uses a block-scope static records array with one row per pool entry and passes the selected row and…
Out of Scope Changes check		The changes stay within [#1057]. The pointer and capacity fields, per-entry storage, fallback cleanup, capacity-bounded reads, Rule 8.9 placement, pool-cost documentation, and regression test all supp…
Description check		The description provides the purpose through Closes #1057, explains the implementation, documents RAM impact, identifies affected components, and gives detailed test evidence. It does not use the te…

Full details: Linked Issues check

Explanation

[#1057] The current implementation removes the record slot from the fallback. SolidSyslog_Create uses a block-scope static records array with one row per pool entry and passes the selected row and capacity to SolidSyslog_Initialise. SolidSyslog_Cleanup clears Record and RecordCapacity while installing the Null buffer and store. SolidSyslog_Service uses RecordCapacity for reads. This also addresses MISRA C:2012 Rule 8.9. The new two-instance retry test checks independent held records. The SOLIDSYSLOG_POOL_SIZE comment documents the record-slot cost. The supplied scope assigns the separate hardening-path wording to #1055, so its absence does not leave a coding requirement from #1057 unmet.

Full details: Out of Scope Changes check

Explanation

The changes stay within [#1057]. The pointer and capacity fields, per-entry storage, fallback cleanup, capacity-bounded reads, Rule 8.9 placement, pool-cost documentation, and regression test all support the selected design. The fixture comment and MISRA suppression updates support the test and the moved production code. No unrelated production feature or behaviour change is established by the available evidence.

Full details: Description check

Explanation

The description provides the purpose through Closes #1057, explains the implementation, documents RAM impact, identifies affected components, and gives detailed test evidence. It does not use the template headings exactly, but it contains the required information and is sufficiently complete.

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Actionable comments posted: 1

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Inline comments:
Review comments at @Tests/SolidSyslogServiceHeldRecordTest.cpp:
- Line 319: Update OtherHoldsARecordForADownSender to service other after
servicing solidSyslog, then assert that otherSender was called twice and its
last buffer is “other”. Preserve the existing assertions for fakeSender and its
retained “first” record.

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• Source mode: Auto
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• Branch: refactor/null-instance-no-record-slot
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Reviewing files that changed from the base of the PR and between dac9961 and 49d5481.

📒 Files selected for processing: 7

• Core/Interface/SolidSyslogTunablesDefaults.h
• Core/Source/SolidSyslog.c
• Core/Source/SolidSyslogPrivate.h
• Core/Source/SolidSyslogStatic.c
• Tests/Fixtures/TunableOverrides.h
• Tests/SolidSyslogServiceHeldRecordTest.cpp
• misra_suppressions.txt

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☀️   Quality Summary

     build-linux-gcc (Whole Project): ✅ successful — 2076 passed
     build-freertos-host-tdd-plustcp (Whole Project): ✅ successful — 2961 passed
     build-linux-clang (Whole Project): ✅ successful — 1905 passed
     sanitize-linux-gcc (Whole Project): ✅ successful — 1905 passed
     integration-linux-openssl (Whole Project): ✅ successful — 45 passed
     integration-linux-mbedtls (Whole Project): ✅ successful — 69 passed
     integration-linux-littlefs (Whole Project): ✅ successful — 14 passed
     integration-windows-openssl (Whole Project): ✅ successful — 45 passed
     bdd-linux-syslog-ng (Whole Project): ✅ successful — 82 passed, 3 skipped
     bdd-windows-otel (Whole Project): ✅ successful — 80 passed, 5 skipped
     bdd-freertos-qemu-plustcp (Whole Project): ✅ successful — 72 passed, 13 skipped
     bdd-freertos-qemu-lwip (Whole Project): ✅ successful — 72 passed, 13 skipped
     bdd-cmsis-qemu-lwip (Whole Project): ✅ successful — 72 passed, 13 skipped
     build-windows-msvc (Whole Project): ✅ successful — 1713 passed
     build-linux-tunable-override (Whole Project): ✅ successful — 1905 passed
     vxworks64-host (Whole Project): ✅ successful — 2082 passed
   ⚠️   Clang-Tidy (Whole Project): No warnings
   ⚠️   CPPCheck (Whole Project): No warnings

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