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perf: Inline an addToList, and reserved space for the list - #914

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perf: Inline an addToList, and reserved space for the list#914
ldintr wants to merge 1 commit into
ldintr-switchPbjfrom
ldintr-addToList

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@ldintr ldintr commented Aug 31, 2026

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Replaces a generic addToList helper call per element with an inlined list.add(...), and pre-sizes the list via ensureCapacity estimated from the packed byte length, avoiding repeated growth/copy for large packed lists.

Overview: PbjReader/PbjWriter are a leaner, buffer-reusing alternative to the existing ReadableSequentialData/WritableSequentialData read/write path used by Codec, ProtoParserTools/ProtoWriterTools, and the pbj-compiler generators. They reuse an internal ~16KB (L1-cache-sized) buffer across many parse/write calls instead of allocating per call, avoid checked-exception-based control flow by recording a sticky internal error code instead, and split hot-path operations (e.g. zigzag vs. non-zigzag varints, direct UTF-8 decode into a reusable char[]) into dedicated fast methods.

Signed-off-by: ldintr <levo.d@swirldslabs.com>
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ldintr requested review from a team as code owners August 31, 2026 16:45
@ldintr ldintr self-assigned this Aug 31, 2026
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JUnit Test Report

   523 files  ±0     523 suites  ±0   29s ⏱️ -2s
 1 643 tests ±0   1 639 ✅ ±0   4 💤 ±0  0 ❌ ±0 
10 861 runs  ±0  10 833 ✅ ±0  28 💤 ±0  0 ❌ ±0 

Results for commit 3ec00b4. ± Comparison against base commit 2719638.

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Integration Test Report

    428 files      428 suites   15m 44s ⏱️
115 048 tests 115 048 ✅ 0 💤 0 ❌
115 292 runs  115 292 ✅ 0 💤 0 ❌

Results for commit 3ec00b4.

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