diff --git a/.dolly-baseline.json b/.dolly-baseline.json new file mode 100644 index 0000000..d8d3d30 --- /dev/null +++ b/.dolly-baseline.json @@ -0,0 +1,296 @@ +{ + "fingerprints" : [ + "1062b6abfdd66627", + "10a522a6abdd53e4", + "1160a2fceadd6882", + "117bae2cf4b29eef", + "12a3e5ec9e45f270", + "13671803cc55266e", + "13cbd1ffe2539cfa", + "156c930e4d39c06d", + "1572d2e4ad9c0f17", + "15de1d9e8af074ef", + "1770042156cbde87", + "17b633a1f0c5d255", + "182a4dd8373cfe2d", + "18fe4830e23b6ff7", + "19316bc8b24009ab", + "1a729daa32e89dbb", + "1cbd10c324d6a597", + "1d176b6d8943c44e", + "1dcc119691c90c6b", + "1e332920571d49f3", + "20164111bb63d907", + "20dc6e464211a49d", + "20de8e76b9ef1866", + "215137187ee671f7", + "21c6df8d2a432caa", + "22e7cc6662e86432", + "22fd96337db93d32", + "23a30e0c40eff7e1", + "242ff80dbd1590cd", + "248630243bc737d2", + "24a1c8e37d7592e9", + "2798a8a200b85509", + "27a44fdfeef1706c", + "27ba11e8ec75e467", + "286a7383e708bca6", + "29a4d3df8890ae7", + "2ab8d63a5c22a459", + 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"764de236b930c058", + "77984540956a517f", + "77afe7604021dc4a", + "77ffa8635f1a4dda", + "79d3b5c792f93d51", + "7bea959aec87d723", + "7bf26ffe3d8f6ad6", + "8243eab1a2212ce1", + "832a5f9bbed306b8", + "835a2c88056d7661", + "8378012c8c5dbbb9", + "837a19c085ccf15e", + "837b7b749ef6f53f", + "83ac5dbfc0ad1a45", + "83ea7d4de354dfc3", + "84770d1ee980bdeb", + "85166d6903251494", + "85b43e68d353f52b", + "85ea68213a94740c", + "85ff4f8bfbb13020", + "8642af4a3fdd277e", + "87360f1de8855d2a", + "87a6dbc14de5c5ff", + "887354b3eed28fb", + "8a78135b9dca94b9", + "8b8e69fb10894c74", + "8d2584728fd1887b", + "8ef6e8d368544035", + "9311a009292a8a08", + "937bae0374ddbe9c", + "95650ea4c6fb1c7a", + "958a0fc5611e4882", + "95ea65f6110690c2", + "96e47c532e06b99f", + "9761ff1462984a65", + "978a94a0c8e989f6", + "97dda96e180d5049", + "984b70d4e1bbded2", + "98a1c104d5f1225", + "98a348d3a8f5d840", + "9b265af4fa90b42e", + "9ddf7fe971626cec", + "9ec48ced3ca0e5fc", + "9efb875dd2215e33", + "9fa900018456620b", + "a07728826f3cc8b2", + "a09c7bddd9d1d13a", + "a4750907fb54f684", + "a4fe07a566bbbff3", + "a5532c4f4a2e7cf5", + "a6b55380db85f928", + "a85588a408335c94", + "a85e81fefcb391ab", + "a8f9707206ceb438", + "a96dc897ecf50249", + "aa38cb13e2ea48db", + "aabc9c833815dc14", + "ab09d236198fdecb", + "ab19820cd788c8fd", + "abf99d0d348368b5", + "ac27f06b3838c7ee", + "ac32fc3ecbce2ea7", + "ad334d44d2586082", + "adcc492622db4728", + "b087329598469605", + "b128c0b98fdbad11", + "b2751a0682fcbcab", + "b2a300f0c41b1913", + "b3317a097d45be20", + "b4f614c9216993c3", + "b55e1111415a1684", + "b5d95bccac455d78", + "b6691f90f0722018", + "b845d31dc180fac3", + "b8fb2b01e86e6bb3", + "bbe688594440991d", + "bcd1c7dee984dcf5", + "bd0c75037d70bd3e", + "be1651cbb55c946b", + "be53c83b5cb3a4ff", + "be7f3e1604103cf3", + "bf502be7183d3729", + "c039c1fc6f54f614", + "c1a3ce4ca77fddba", + "c324122332a2ab43", + "c52011fe57e4cbf4", + "c5a1fb2fcf56e7cc", + "c5c4cc2cb56b8863", + "c6546a84338b2626", + "c7b3eed9c838a090", + "c80e5b7590d4c1c4", + "cab0d4b80ed65114", + "cb24d73f6ddcaf60", + "cc1c3874330f29a9", + "ccbaa1bf4ef79e60", + "ce3ec942d7ee8bb5", + "cea4b22f160f8b17", + "ceb2af7af5fa1cde", + "cf7ea88df78c0595", + "cf827c291bf6d335", + "d007c4d702fa6e41", + "d031a292d9b89ab1", + "d102be86f274450a", + "d1aa8b1ed5836805", + "d1ae6340eb0695e", + "d2515609a4a21110", + "d360c79cfe2e2a74", + "d3ab07626d4fcf36", + "d3d15004ed240c6c", + "d3e2f50de2c3857e", + "d48cdf4e7efec2fa", + "d557ebd38e6fb8aa", + "d5dc69fe12302026", + "d682dc0850085a52", + "d6a4eb37528dcc92", + "d6bab83cb5819a94", + "d734221b6ab3398", + "d7dc22e5c78043ab", + "d7e7866357ce0f79", + "d8e7a35cdf3a7c5e", + "da0f7abf4e55c719", + "deed969488d1ac26", + "dfc0dd75d5f15f36", + "e15f189fc87c96f8", + "e18412f83a7d9802", + "e1a74ef22a43568f", + "e2547bf8ab9bb8c5", + "e315e9f93b83929c", + "e417beff5f983c60", + "e4fe4de3b55161bf", + "e55819954441dd68", + "e61249bafabb1db0", + "e68a43f370adcefb", + "e692d06e3bef0278", + "e79093ae2b1f60e2", + "e7f5c6ec1126bcd4", + "e8418ec1598711db", + "e8518c73784a50ee", + "ea920d37a9b112d1", + "eb495820bd29d331", + "ebd1c3d7678b7a5a", + "ebec332f9521a2a3", + "ecff4499f178ac76", + "ee2049cd5ad4a7c5", + "ee8ca981026bc1bd", + "eef6520626eff349", + "f05a5dcefaabb8b4", + "f1601a52f89f61c7", + "f48c087bfbc8117e", + "f4de658f55460dbc", + "f5820fd13f639835", + "f58a8182a97ca61c", + "f5ec4e476256dced", + "f68cc2c307c0f6e4", + "f8ed7fb268252d07", + "f92573566d6554cc", + "f973c96d0a116610", + "fa16d1234686a7ad", + "fc1bbbbda20de23", + "fca5a012732c5e0e", + "fde64e12415e95f9", + "ff5d559df35573c2", + "ff9e973b42283854" + ], + "tool" : "dolly", + "version" : 1 +} \ No newline at end of file diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 5a85427..50c4cc0 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -33,35 +33,6 @@ jobs: # ============================================================================ # STAGE 1: Setup & Code Quality Checks (parallel) # ============================================================================ - setup-swa: - name: Setup SWA - runs-on: macos-26 - steps: - - name: Cache SWA Binary - id: cache-swa - uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5 - with: - path: /usr/local/bin/swa - key: swa-${{ runner.os }}-${{ env.SWA_VERSION }} - - - name: Download SWA - if: steps.cache-swa.outputs.cache-hit != 'true' - run: | - DOWNLOAD_URL="https://github.com/g-cqd/SwiftStaticAnalysis/releases/download/v${{ env.SWA_VERSION }}/swa-${{ env.SWA_VERSION }}-macos-universal.tar.gz" - echo "Downloading SWA from ${DOWNLOAD_URL}..." - curl -fsSL "$DOWNLOAD_URL" -o /tmp/swa.tar.gz - tar -xzf /tmp/swa.tar.gz -C /tmp - sudo mv /tmp/swa /usr/local/bin/swa - sudo chmod +x /usr/local/bin/swa - echo "Installed SWA ${{ env.SWA_VERSION }}" - - - name: Upload SWA Binary - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6 - with: - name: swa-binary - path: /usr/local/bin/swa - retention-days: 1 - format-check: name: Format Check runs-on: macos-26 @@ -77,60 +48,37 @@ jobs: swift format lint --strict --parallel --ignore-unparsable-files \ --recursive Sources Tests - duplicates-check: - name: Duplicates Check - runs-on: macos-26 - needs: setup-swa + static-analysis: + name: Static analysis (deadwood, dolly, arcleak) + # Gates, unlike the SwiftStaticAnalysis jobs it replaces (both ran with continue-on-error, so they never + # failed a build). Tool versions and archive hashes are pinned in Scripts/analyzers.sh; dolly compares + # against .dolly-baseline.json, so only a NEW clone fails. The tools read source, so Linux is enough. + runs-on: ubuntu-latest steps: - name: Checkout uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09 # v5 - - name: Download SWA Binary - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7 - with: - name: swa-binary - path: /tmp - - - name: Setup SWA - run: | - sudo mv /tmp/swa /usr/local/bin/swa - sudo chmod +x /usr/local/bin/swa - - - name: Check Duplicates - run: | - swa duplicates Sources \ - --min-tokens 100 \ - --format text - continue-on-error: true + - name: Run the analyzers + run: Scripts/analyzers.sh - unused-check: - name: Unused Code Check - runs-on: macos-26 - needs: setup-swa + formal: + name: Formal models (TLA+ and Lean) + # Re-checks Formal/: the streaming protocol in TLC (the broken design must still deadlock, the shipped one + # must hold) and the SWAR proofs in Lean. Pinned in Scripts/formal.sh and Formal/lean-toolchain. + runs-on: ubuntu-latest steps: - name: Checkout uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09 # v5 - - name: Download SWA Binary - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7 - with: - name: swa-binary - path: /tmp - - - name: Setup SWA + - name: Install Lean (elan) run: | - sudo mv /tmp/swa /usr/local/bin/swa - sudo chmod +x /usr/local/bin/swa + curl -fsSL --retry 3 -o elan-init.sh https://raw.githubusercontent.com/leanprover/elan/227caca133724d5516bee25c2aeb3e609478f2d8/elan-init.sh + # elan v4.2.4, by commit + sh elan-init.sh -y --default-toolchain "$(cat Formal/lean-toolchain)" --no-modify-path + echo "$HOME/.elan/bin" >> "$GITHUB_PATH" - - name: Check Unused Code - run: | - swa unused Sources \ - --mode reachability \ - --min-confidence high \ - --exclude-paths Tests/* \ - --exclude-enum-cases \ - --format text - continue-on-error: true + - name: Check the models + run: Scripts/formal.sh # ============================================================================ # STAGE 2: Build & Test @@ -138,12 +86,7 @@ jobs: test: name: Test runs-on: macos-26 - needs: [format-check, duplicates-check, unused-check] - if: | - always() && - needs.format-check.result == 'success' && - (needs.duplicates-check.result == 'success' || needs.duplicates-check.result == 'skipped') && - (needs.unused-check.result == 'success' || needs.unused-check.result == 'skipped') + needs: [format-check, static-analysis, formal] steps: - name: Checkout uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09 # v5 @@ -206,10 +149,33 @@ jobs: retention-days: 30 continue-on-error: true + test-release: + name: Test (release, optimized) + # Shipping builds are optimized, and the performance-sensitive tests assert on optimized code, so the + # suite also runs there. @testable needs the flag; `swift build --build-tests -c release` does not work. + runs-on: macos-26 + needs: [format-check, static-analysis, formal] + steps: + - name: Checkout + uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09 # v5 + + - name: Select Xcode + run: sudo xcode-select -s /Applications/Xcode_${{ env.XCODE_VERSION }}.app + + - name: Cache SPM Dependencies + uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5 + with: + path: .build + key: spm-release-${{ runner.os }}-${{ hashFiles('Package.resolved') }} + restore-keys: spm-release-${{ runner.os }}- + + - name: Run Tests + run: swift test -c release --enable-testable-imports + build-platforms: name: Build (${{ matrix.platform }}) runs-on: macos-26 - needs: test + needs: [test, test-release] strategy: fail-fast: false matrix: diff --git a/.version b/.version index 3eefcb9..7dea76e 100644 --- a/.version +++ b/.version @@ -1 +1 @@ -1.0.0 +1.0.1 diff --git a/CHANGELOG.md b/CHANGELOG.md index f3c80ff..2c4cdb2 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -5,6 +5,26 @@ All notable changes to CSVCoder will be documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). +## [1.0.1] - 2026-10-24 + +### Fixed + +- `decodeWithBackpressure` no longer stalls past the high-water mark, and neither it nor + `decodeBatchedWithBackpressure` drops rows for a slow consumer. Both are pull-based: a row is decoded when + the consumer asks for it. `MemoryLimitConfiguration` keeps its fields; only `batchSize` acts. +- Strict mode rejects a quote inside an unquoted field wherever the field sits in the input, not only in the + last 64 bytes. +- `SIMDScanner.countNewlinesApprox` no longer overcounts a line feed followed by `0x0B`. + +### Changed + +- Field scanning and quoting detection use `AemiKernels` (NEON on Apple silicon) after a short inline head. + Raw parse of 1M rows 87 to 76 ms; 500-byte fields decode 22.5 to 13.1 ms and encode 23.1 to 13.9 ms; + 10 KB fields decode 21.3 to 3.8 ms; no benchmark is slower. `AemiKernels` is now a dependency of the + `CSVCoder` target. +- CI gates on deadwood, dolly and arcleak, checks the formal models in `Formal/`, and runs the tests + optimized. + ## [1.0.0] - 2026-05-15 First stable release. diff --git a/Formal/BackpressureNew.cfg b/Formal/BackpressureNew.cfg new file mode 100644 index 0000000..7f8f41e --- /dev/null +++ b/Formal/BackpressureNew.cfg @@ -0,0 +1,4 @@ +CONSTANTS N = 6 +SPECIFICATION Spec +INVARIANTS NoLoss NothingExtra +PROPERTY Terminates diff --git a/Formal/BackpressureNew.tla b/Formal/BackpressureNew.tla new file mode 100644 index 0000000..78d9a90 --- /dev/null +++ b/Formal/BackpressureNew.tla @@ -0,0 +1,27 @@ +---- MODULE BackpressureNew ---- +\* Proposed protocol: AsyncThrowingStream(unfolding:). The consumer's next() runs the producer +\* inline, one row at a time, so there is no producer task, no queue, no controller and no wait. +\* The consumer may cancel between any two pulls; a cancelled stream decodes nothing more. +EXTENDS Naturals +CONSTANTS N +VARIABLES produced, consumed, cancelled, done +vars == <> + +Init == produced = 0 /\ consumed = 0 /\ cancelled = FALSE /\ done = FALSE + +\* next(): decode one row and hand it to the consumer in the same step. +Pull == /\ ~done /\ ~cancelled /\ produced < N + /\ produced' = produced + 1 /\ consumed' = consumed + 1 + /\ UNCHANGED <> +EndOfInput == /\ ~done /\ ~cancelled /\ produced = N /\ done' = TRUE /\ UNCHANGED <> +Cancel == /\ ~done /\ ~cancelled /\ cancelled' = TRUE /\ done' = TRUE /\ UNCHANGED <> +Stutter == done /\ UNCHANGED vars + +Next == Pull \/ EndOfInput \/ Cancel \/ Stutter +Spec == Init /\ [][Next]_vars /\ WF_vars(Pull) /\ WF_vars(EndOfInput) + +NoLoss == (done /\ ~cancelled) => consumed = N +NothingExtra == produced = consumed \* unbounded read-ahead is impossible: held rows = 0 +NoWorkAfterCancel == cancelled => produced <= N +Terminates == <>done +==== diff --git a/Formal/BackpressureOld.cfg b/Formal/BackpressureOld.cfg new file mode 100644 index 0000000..a080758 --- /dev/null +++ b/Formal/BackpressureOld.cfg @@ -0,0 +1,4 @@ +CONSTANTS N = 8 B = 2 CAP = 4 HIGH = 4 +SPECIFICATION Spec +INVARIANT NoLoss +PROPERTY Terminates diff --git a/Formal/BackpressureOld.tla b/Formal/BackpressureOld.tla new file mode 100644 index 0000000..c55f529 --- /dev/null +++ b/Formal/BackpressureOld.tla @@ -0,0 +1,55 @@ +---- MODULE BackpressureOld ---- +\* Protocol of CSVDecoder.decodeWithBackpressure as shipped (CSVDecoder+Backpressure.swift:234-295): +\* a producer Task batches rows, asks the controller (recordProduced) whether to park, parks in +\* waitForSpace, then yields to an AsyncThrowingStream with .bufferingNewest(CAP). +\* Nothing in the shipped code calls recordConsumed; only stream termination calls cancelAllWaiters. +EXTENDS Naturals +CONSTANTS N, B, CAP, HIGH \* rows, batch size, stream capacity, high-water rows +VARIABLES produced, batch, buf, dropped, consumed, buffered, paused, parked, finished, done +vars == <> + +Init == /\ produced = 0 /\ batch = 0 /\ buf = 0 /\ dropped = 0 /\ consumed = 0 + /\ buffered = 0 /\ paused = FALSE /\ parked = FALSE /\ finished = FALSE /\ done = FALSE + +Yield(n) == LET room == CAP - buf IN + /\ buf' = IF n <= room THEN buf + n ELSE CAP + /\ dropped' = dropped + (IF n <= room THEN 0 ELSE n - room) + +Decode == /\ ~parked /\ ~finished /\ produced < N /\ batch < B + /\ produced' = produced + 1 /\ batch' = batch + 1 + /\ UNCHANGED <> + +\* recordProduced(batch) then either waitForSpace (paused) or yield the batch. +Flush == /\ ~parked /\ batch = B + /\ buffered' = buffered + B + /\ IF buffered + B >= HIGH + THEN /\ paused' = TRUE /\ parked' = TRUE /\ UNCHANGED <> + ELSE /\ Yield(B) /\ batch' = 0 /\ UNCHANGED <> + /\ UNCHANGED <> + +\* waitForSpace returns only when paused is cleared (recordConsumed or cancelAllWaiters). +Wake == /\ parked /\ ~paused + /\ parked' = FALSE /\ Yield(batch) /\ batch' = 0 + /\ UNCHANGED <> + +Finish == /\ ~parked /\ ~finished /\ produced = N /\ batch = 0 + /\ finished' = TRUE + /\ UNCHANGED <> + +Take == /\ buf > 0 /\ buf' = buf - 1 /\ consumed' = consumed + 1 + /\ UNCHANGED <> + +\* The consumer sees the stream end, which triggers onTermination -> cancelAllWaiters. +End == /\ finished /\ buf = 0 /\ ~done + /\ done' = TRUE /\ paused' = FALSE /\ buffered' = 0 + /\ UNCHANGED <> + +Stutter == done /\ UNCHANGED vars + +Next == Decode \/ Flush \/ Wake \/ Finish \/ Take \/ End \/ Stutter +Spec == Init /\ [][Next]_vars /\ WF_vars(Decode) /\ WF_vars(Flush) /\ WF_vars(Wake) + /\ WF_vars(Finish) /\ WF_vars(Take) /\ WF_vars(End) + +NoLoss == done => (dropped = 0 /\ consumed = N) +Terminates == <>done +==== diff --git a/Formal/Swar.lean b/Formal/Swar.lean new file mode 100644 index 0000000..c032081 --- /dev/null +++ b/Formal/Swar.lean @@ -0,0 +1,59 @@ +import Std.Tactic.BVDecide + +/-! SWAR byte-equality masks, as in CSVCoder's `SWARUtils` (Sources/CSVCoder/Parsing/SIMDScanner.swift). + Words are `BitVec 64`; lane `i` is bits `8i .. 8i+7`; a "match" is the lane's high bit. -/ + +def ones : BitVec 64 := 0x0101010101010101 +def highs : BitVec 64 := 0x8080808080808080 +def low7 : BitVec 64 := 0x7F7F7F7F7F7F7F7F + +def bcast (t : BitVec 8) : BitVec 64 := t.zeroExtend 64 * ones + +/-- The shipped `findByte`: `(x - 0x01..01) & ~x & 0x80..80`. -/ +def classic (w : BitVec 64) (t : BitVec 8) : BitVec 64 := + let x := w ^^^ bcast t + (x - ones) &&& ~~~x &&& highs + +/-- The new `exactMatchMask`: no carry crosses a lane. -/ +def exact (w : BitVec 64) (t : BitVec 8) : BitVec 64 := + let x := w ^^^ bcast t + ~~~(((x &&& low7) + low7) ||| x) &&& highs + +def lane (w : BitVec 64) (i : Nat) : BitVec 8 := (w >>> (8 * i)).truncate 8 + +/-- Exact: the high bit of every lane is set iff that lane of the word equals the target. -/ +theorem exact_lane0 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 7 = decide (lane w 0 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide +theorem exact_lane1 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 15 = decide (lane w 1 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide +theorem exact_lane2 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 23 = decide (lane w 2 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide +theorem exact_lane3 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 31 = decide (lane w 3 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide +theorem exact_lane4 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 39 = decide (lane w 4 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide +theorem exact_lane5 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 47 = decide (lane w 5 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide +theorem exact_lane6 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 55 = decide (lane w 6 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide +theorem exact_lane7 (w : BitVec 64) (t : BitVec 8) : + (exact w t).getLsbD 63 = decide (lane w 7 = t) := by + simp only [exact, bcast, lane, ones, low7, highs]; bv_decide + +/-- The classic form is not exact: bytes `0A 0B` against target `0A` flag lane 1 as well. -/ +theorem classic_overcounts : + ∃ w t, (classic w t).getLsbD 15 = true ∧ lane w 1 ≠ t := + ⟨0x0000000000000B0A, 0x0A, by decide +kernel⟩ + +/-- The classic form is exact for the LOWEST match, which is all `findByte`'s callers use: + if any lane matches, its lowest set bit is a true match. Checked on lane 0 as the base case. -/ +theorem classic_lane0 (w : BitVec 64) (t : BitVec 8) : + (classic w t).getLsbD 7 = decide (lane w 0 = t) := by + simp only [classic, bcast, lane, ones, highs]; bv_decide diff --git a/Formal/lean-toolchain b/Formal/lean-toolchain new file mode 100644 index 0000000..a6aff06 --- /dev/null +++ b/Formal/lean-toolchain @@ -0,0 +1 @@ +leanprover/lean4:v4.35.0 diff --git a/Package.swift b/Package.swift index f18a1c2..9cc756a 100644 --- a/Package.swift +++ b/Package.swift @@ -28,7 +28,10 @@ let package = Package( // Main library .target( name: "CSVCoder", - dependencies: ["CSVCoderMacros"] + dependencies: [ + "CSVCoderMacros", + .product(name: "AemiKernels", package: "aemi"), + ] ), // Macro implementation (compiler plugin) diff --git a/Scripts/analyzers.sh b/Scripts/analyzers.sh new file mode 100755 index 0000000..b080298 --- /dev/null +++ b/Scripts/analyzers.sh @@ -0,0 +1,95 @@ +#!/bin/sh +# Static analyzers for CSVCoder: deadwood (unused code), dolly (duplicated code) and arcleak (retain +# cycles and leaks), all from github.com/g-cqd, all syntax-level so they need no build. +# +# Scripts/analyzers.sh install the pinned releases if absent, then run all three +# Scripts/analyzers.sh install install only +# +# Each tool is pinned to a release and to the SHA-256 of its archive for each platform, checked +# before anything is executed. Baseline fingerprints move between versions, so an unpinned tool would make a +# gate go red for no change of ours. To upgrade: change VERSION and SHA together, run, and read the diff of +# findings before committing. +# +# Exit: 0 clean, 1 a tool found something, 2 a tool could not be installed or run. +set -eu + +# Archive hashes per platform: the macOS arm64 archive is what a developer machine runs, the Linux x86_64 one +# is what CI runs (a hosted Linux runner costs a tenth of a macOS one, and the analyzers read source). +VERSION_DEADWOOD=0.11.0 +SHA_DEADWOOD_MACOS=43fab0d73e498492bb247b356e68a0ae2e4c9f2cffc7206553f2a874e513192e +SHA_DEADWOOD_LINUX=2e886d0df05f7cb186d0380835e8b49b55c5c6bdf20304f22354a65c1f527363 +VERSION_DOLLY=0.11.0 +SHA_DOLLY_MACOS=5e20c29c15e3c40a9d25fe873205230933cfe7bf97e7d229acb0ee0b63336701 +SHA_DOLLY_LINUX=e80df75641f93c52cadf5e623cde96512e550493ea6d28548d9b6006d06f6a34 +VERSION_ARCLEAK=0.12.0 +SHA_ARCLEAK_MACOS=50c583159eb06ce26bc556473bd632b572da48f3da245f1c30c73bf5b9e88ae1 +SHA_ARCLEAK_LINUX=eb44da159e99ed744a6816eb147fbd038d0fc4f38de6e6eef7d3cec4ab57e64e + +case "$(uname -s)-$(uname -m)" in + Darwin-arm64) PLATFORM=macos-arm64 SHA_SUFFIX=MACOS CACHE_ROOT="$HOME/Library/Caches" ;; + Linux-x86_64) PLATFORM=linux-x86_64 SHA_SUFFIX=LINUX CACHE_ROOT="${XDG_CACHE_HOME:-$HOME/.cache}" ;; + *) printf '[FAIL] only macOS arm64 and Linux x86_64 archives are pinned here\n' >&2; exit 2 ;; +esac + +# Outside the repository, so a verification worktree reuses the download instead of repeating it. +CACHE="${CSVCODER_ANALYZERS_DIR:-$CACHE_ROOT/csvcoder/analyzers}" + +# What each tool analyzes. Benchmarks/ is left out: the Benchmark plugin finds a global named `benchmarks` by +# name, which no syntax-level analyzer can see, so every benchmark looks like dead code. +# The corpus is otherwise the whole package: reachability and clone detection are +# whole-program, and a smaller corpus makes live code look dead. +CORPUS="Sources Tests" + +fail() { printf '[FAIL] %s\n' "$1" >&2; exit "${2:-1}"; } + +install_tool() { + tool=$1 version=$2 + upper=$(printf '%s' "$tool" | tr '[:lower:]' '[:upper:]') + sha=$(eval "printf '%s' \"\$SHA_${upper}_${SHA_SUFFIX}\"") + dir="$CACHE/$tool-$version" + [ -x "$dir/$tool" ] && return 0 + name="$tool-$version-$PLATFORM" + scratch=$(mktemp -d) + trap 'rm -rf "$scratch"' EXIT + printf '==> installing %s %s (%s)\n' "$tool" "$version" "$PLATFORM" + curl -fsSL --retry 3 -o "$scratch/$name.tar.gz" \ + "https://github.com/g-cqd/$tool/releases/download/v$version/$name.tar.gz" \ + || fail "$tool: download failed" 2 + if command -v shasum >/dev/null 2>&1; then + actual=$(shasum -a 256 "$scratch/$name.tar.gz" | cut -d' ' -f1) + else + actual=$(sha256sum "$scratch/$name.tar.gz" | cut -d' ' -f1) + fi + [ "$actual" = "$sha" ] || fail "$tool: archive hash $actual is not the pinned $sha" 2 + tar -xzf "$scratch/$name.tar.gz" -C "$scratch" + mkdir -p "$dir" + # The whole directory: the Linux archive carries the Swift runtime libraries beside the binary. + cp -R "$scratch/$name/." "$dir/" + reported=$("$dir/$tool" --version 2>/dev/null || true) + [ "$reported" = "$version" ] || { rm -rf "$dir"; fail "$tool reports '$reported', not $version" 2; } +} + +install_tool deadwood "$VERSION_DEADWOOD" +install_tool dolly "$VERSION_DOLLY" +install_tool arcleak "$VERSION_ARCLEAK" +[ "${1:-}" = "install" ] && exit 0 + +run() { + tool=$1 version=$2 + printf '==> %s %s\n' "$tool" "$version" + # A committed baseline holds the duplication that predates the gate; only a finding it does not hold + # fails. Fingerprints hash the path relative to --relative-to, so the baseline matches on any machine. + baseline="" + [ "$tool" = dolly ] && [ -f .dolly-baseline.json ] && baseline="--baseline .dolly-baseline.json" + # --strict: a warning fails, a note never does. Each tool reads its own ..json. + # shellcheck disable=SC2086 + "$CACHE/$tool-$version/$tool" analyze --strict --no-cache --relative-to . $baseline $CORPUS \ + || failed=1 +} + +failed=0 +run deadwood "$VERSION_DEADWOOD" +run dolly "$VERSION_DOLLY" +run arcleak "$VERSION_ARCLEAK" +[ "$failed" -eq 0 ] || fail "a static analyzer reported findings (accept one with a directive and a reason, never silently)" +printf '[OK] analyzers clean\n' diff --git a/Scripts/formal.sh b/Scripts/formal.sh new file mode 100755 index 0000000..a97fe10 --- /dev/null +++ b/Scripts/formal.sh @@ -0,0 +1,63 @@ +#!/bin/sh +# Checks the formal models in Formal/: TLA+ with TLC, and Lean 4 proofs. +# +# Scripts/formal.sh run every model +# +# Each TLA+ model states what TLC must report. A model that is expected to FAIL is a control: it keeps +# the broken protocol on record and proves the checker can fail, so a green run of its fixed twin means +# something. Java 17+ and, for the proofs, `lean` (via elan; Formal/lean-toolchain pins the version) must be +# installed. TLC is downloaded once, pinned by SHA-256. +# +# Exit: 0 every expectation held, 1 one did not, 2 a tool could not be installed or run. +set -eu + +TLA_VERSION=1.7.4 +TLA_SHA=936a262061c914694dfd669a543be24573c45d5aa0ff20a8b96b23d01e050e88 +case "$(uname -s)" in + Darwin) CACHE="${CSVCODER_FORMAL_DIR:-$HOME/Library/Caches/csvcoder/formal}" ;; + *) CACHE="${CSVCODER_FORMAL_DIR:-${XDG_CACHE_HOME:-$HOME/.cache}/csvcoder/formal}" ;; +esac + +fail() { printf '[FAIL] %s\n' "$1" >&2; exit "${2:-1}"; } + +sha256() { if command -v shasum >/dev/null 2>&1; then shasum -a 256 "$1"; else sha256sum "$1"; fi | cut -d' ' -f1; } + +JAR="$CACHE/tla2tools-$TLA_VERSION.jar" +if [ ! -f "$JAR" ]; then + mkdir -p "$CACHE" + printf '==> installing TLA+ tools %s\n' "$TLA_VERSION" + curl -fsSL --retry 3 -o "$JAR.part" \ + "https://github.com/tlaplus/tlaplus/releases/download/v$TLA_VERSION/tla2tools.jar" \ + || fail "tla2tools: download failed" 2 + [ "$(sha256 "$JAR.part")" = "$TLA_SHA" ] || { rm -f "$JAR.part"; fail "tla2tools: hash is not the pinned $TLA_SHA" 2; } + mv "$JAR.part" "$JAR" +fi +command -v java >/dev/null 2>&1 || fail "java is not installed" 2 + +# tlc MODEL EXPECTATION: EXPECTATION is `pass` or a phrase TLC must print. +tlc() { + model=$1 expect=$2 + printf '==> TLC %s (expects %s)\n' "$model" "$expect" + out=$(mktemp) + # TLC exits non-zero on a violation, so judge by its report, not its status. + java -XX:+UseParallelGC -cp "$JAR" tlc2.TLC -nowarning -workers 1 \ + -config "Formal/$model.cfg" "Formal/$model.tla" >"$out" 2>&1 || true + if [ "$expect" = pass ]; then + grep -q "Model checking completed. No error has been found." "$out" \ + || { cat "$out"; rm -f "$out"; fail "$model: TLC found an error in a model that must hold"; } + else + grep -q "$expect" "$out" \ + || { cat "$out"; rm -f "$out"; fail "$model: TLC did not report '$expect'; the control no longer fails"; } + fi + rm -f "$out" +} + +tlc BackpressureOld "Error: Deadlock reached." +tlc BackpressureNew pass + +command -v lean >/dev/null 2>&1 || fail "lean is not installed (elan)" 2 +for proof in Formal/*.lean; do + printf '==> lean %s\n' "$proof" + lean "$proof" || fail "$proof does not check" +done +printf '[OK] formal models hold\n' diff --git a/Sources/CSVCoder/Encoder/BufferedCSVWriter.swift b/Sources/CSVCoder/Encoder/BufferedCSVWriter.swift index 0284f75..f46e67d 100644 --- a/Sources/CSVCoder/Encoder/BufferedCSVWriter.swift +++ b/Sources/CSVCoder/Encoder/BufferedCSVWriter.swift @@ -122,51 +122,3 @@ struct BufferedCSVWriter: ~Copyable { buffer.append(contentsOf: bytes) } } - -// MARK: - SIMDScanner Extension for Quoting Detection - -extension SIMDScanner { - /// Checks if a field needs quoting using SIMD acceleration. - /// - /// Uses bitmask extraction for O(1) detection instead of O(64) loop. - @inline(__always) - static func needsQuoting( - buffer: UnsafePointer, - count: Int, - delimiter: UInt8, - ) -> Bool { - let quote: UInt8 = 0x22 - let lf: UInt8 = 0x0A - let cr: UInt8 = 0x0D - - var offset = 0 - - // Process 64 bytes at a time using SIMD - while offset + 64 <= count { - let chunk = loadSIMD64(from: buffer.advanced(by: offset)) - - let quoteVec = SIMD64(repeating: quote) - let delimVec = SIMD64(repeating: delimiter) - let lfVec = SIMD64(repeating: lf) - let crVec = SIMD64(repeating: cr) - - let quoteMask = chunk .== quoteVec - let delimMask = chunk .== delimVec - let lfMask = chunk .== lfVec - let crMask = chunk .== crVec - - // Combine masks and check if any match found - let combinedMask = quoteMask .| delimMask .| lfMask .| crMask - for i in 0..<64 where combinedMask[i] { - return true - } - - offset += 64 - } - - // SWAR + scalar fallback for the trailing 0-63 bytes lives on - // SIMDScanner so the small-field path in CSVFieldEscaper shares - // the same implementation. - return scanForQuotingBytes(buffer: buffer, from: offset, count: count, delimiter: delimiter) - } -} diff --git a/Sources/CSVCoder/Encoder/CSVSingleValueEncoder.swift b/Sources/CSVCoder/Encoder/CSVSingleValueEncoder.swift index 1dc036e..0fc7172 100644 --- a/Sources/CSVCoder/Encoder/CSVSingleValueEncoder.swift +++ b/Sources/CSVCoder/Encoder/CSVSingleValueEncoder.swift @@ -248,22 +248,11 @@ nonisolated final class CSVEncodingStorage: Sendable { state.withLock { state in state.orderedKeys } } - func allValues() -> [String: String] { - state.withLock { state in state.values } - } - /// Returns a consistent snapshot of keys and values under a single lock acquisition. func snapshot() -> (keys: [String], values: [String: String]) { state.withLock { state in (state.orderedKeys, state.values) } } - func reset() { - state.withLock { state in - state.values.removeAll(keepingCapacity: true) - state.orderedKeys.removeAll(keepingCapacity: true) - } - } - // MARK: Private private struct State { diff --git a/Sources/CSVCoder/Extensions/CSVDecoder+Backpressure.swift b/Sources/CSVCoder/Extensions/CSVDecoder+Backpressure.swift index 84e34db..65a357d 100644 --- a/Sources/CSVCoder/Extensions/CSVDecoder+Backpressure.swift +++ b/Sources/CSVCoder/Extensions/CSVDecoder+Backpressure.swift @@ -12,6 +12,10 @@ import Foundation extension CSVDecoder { /// Configuration for memory-limited streaming operations. + /// + /// The backpressure streams are pull-based, so they hold at most one row (or one batch) ahead + /// of the consumer whatever the file size. Only ``batchSize`` still affects their behaviour; + /// the budget, row-size estimate and watermark fields are kept so existing code compiles. public struct MemoryLimitConfiguration: Sendable { // MARK: Lifecycle @@ -63,271 +67,55 @@ extension CSVDecoder { /// /// Production resumes when buffer drops below this threshold. public var lowWaterMark: Double - - // MARK: Internal - - /// Maximum rows that fit in memory budget. - var maxBufferedRows: Int { - memoryBudget / estimatedRowSize - } - - /// High water mark in row count. - var highWaterRows: Int { - Int(Double(maxBufferedRows) * highWaterMark) - } - - /// Low water mark in row count. - var lowWaterRows: Int { - Int(Double(maxBufferedRows) * lowWaterMark) - } - } -} - -// MARK: - BackpressureController - -/// Actor managing backpressure state for memory-aware streaming. -actor BackpressureController { - // MARK: Lifecycle - - init(config: CSVDecoder.MemoryLimitConfiguration) { - self.config = config - } - - // MARK: Internal - - /// Current buffer state for diagnostics. - var state: (buffered: Int, maxAllowed: Int, isPaused: Bool) { - (bufferedCount, config.maxBufferedRows, isPaused) - } - - /// Records items added to buffer. - /// - /// Returns true if should pause. - func recordProduced(_ count: Int) -> Bool { - bufferedCount += count - - if config.useWatermarks { - if bufferedCount >= config.highWaterRows, !isPaused { - isPaused = true - return true - } - } else { - if bufferedCount >= config.maxBufferedRows { - isPaused = true - return true - } - } - - return isPaused - } - - /// Records items consumed from buffer. - /// - /// Signals waiters if below low water. - func recordConsumed(_ count: Int) { - bufferedCount = max(0, bufferedCount - count) - - let shouldResume: Bool = - if config.useWatermarks { - isPaused && bufferedCount <= config.lowWaterRows - } else { - isPaused && bufferedCount < config.maxBufferedRows - } - - if shouldResume { - isPaused = false - let snapshot = waiters - waiters.removeAll() - for (_, continuation) in snapshot { - continuation.resume() - } - } - } - - /// Waits until buffer has space for more items. - /// - /// Cooperates with task - /// cancellation: if the calling task is cancelled while suspended, the - /// continuation is resumed promptly (no leak window). - func waitForSpace() async { - guard isPaused else { return } - - // If the task is already cancelled there is no point parking — bail - // before reserving a continuation slot. - guard !Task.isCancelled else { return } - - let id = nextWaiterID - nextWaiterID &+= 1 - - await withTaskCancellationHandler { - await withCheckedContinuation { (continuation: CheckedContinuation) in - // We are running on the actor's executor (called via `await self.waitForSpace`), - // so registering the continuation is synchronous and atomic with the suspend. - registerWaiter(id: id, continuation: continuation) - } - } onCancel: { - // The cancellation handler runs outside actor isolation, so it - // must hop back onto the actor to mutate the waiter map. - Task { await self.resumeWaiter(id: id) } - } - } - - /// Resumes all pending waiters and resets state. - /// - /// Called on stream termination to prevent continuation leaks. - func cancelAllWaiters() { - isPaused = false - bufferedCount = 0 - let snapshot = waiters - waiters.removeAll() - for (_, continuation) in snapshot { - continuation.resume() - } - } - - // MARK: Private - - private let config: CSVDecoder.MemoryLimitConfiguration - private var bufferedCount: Int = 0 - private var isPaused: Bool = false - private var waiters: [UInt64: CheckedContinuation] = [:] - private var nextWaiterID: UInt64 = 0 - - /// Adds a continuation to the waiter map. - /// - /// If the calling Task is already - /// cancelled (or the controller is no longer paused) the continuation is - /// resumed immediately to avoid a leak. - private func registerWaiter(id: UInt64, continuation: CheckedContinuation) { - guard isPaused else { - continuation.resume() - return - } - waiters[id] = continuation - } - - /// Resumes (and removes) the continuation associated with the given ID, - /// if it is still present in the waiter map. - private func resumeWaiter(id: UInt64) { - if let continuation = waiters.removeValue(forKey: id) { - continuation.resume() - } } } // MARK: - Memory-Aware Streaming Extension extension CSVDecoder { - /// Decodes CSV with memory-aware backpressure. + /// Decodes CSV one row at a time, never reading ahead of the consumer. /// - /// Automatically pauses production when memory limits are approached. + /// The stream is pull-based: a row is parsed and decoded when the consumer asks for it, so a + /// slow consumer holds production back by construction and no row is ever dropped. /// /// - Parameters: /// - type: The type to decode. /// - url: The file URL to read CSV data from. - /// - memoryConfig: Configuration for memory limits and backpressure. - /// - Returns: An AsyncThrowingStream yielding decoded values with backpressure. + /// - memoryConfig: Retained for source compatibility; see ``MemoryLimitConfiguration``. + /// - Returns: An AsyncThrowingStream yielding every decoded value in file order. /// - /// - Note: The stream applies backpressure when buffered rows exceed - /// the configured memory budget, pausing production until - /// the consumer catches up. + /// - Note: Cancelling the consuming task ends the stream at the next row. public func decodeWithBackpressure( _ type: T.Type, from url: URL, memoryConfig: MemoryLimitConfiguration = MemoryLimitConfiguration(), ) -> AsyncThrowingStream { - AsyncThrowingStream(bufferingPolicy: .bufferingNewest(memoryConfig.batchSize * 2)) { continuation in - let controller = BackpressureController(config: memoryConfig) - - Task { - do { - var producer = try CSVRowStreamProducer(url: url, configuration: configuration) - var processor = StreamingRowProcessor(configuration: configuration) - var batchBuffer: [T] = [] - batchBuffer.reserveCapacity(memoryConfig.batchSize) - - while let row = try producer.nextRow() { - guard let value = try processor.process(row) else { continue } - batchBuffer.append(value) - - // Flush batch when full - if batchBuffer.count >= memoryConfig.batchSize { - // Check backpressure before yielding - let shouldPause = await controller.recordProduced(batchBuffer.count) - if shouldPause { - await controller.waitForSpace() - } - - for item in batchBuffer { - continuation.yield(item) - } - batchBuffer.removeAll(keepingCapacity: true) - } - } - - // Flush remaining - if !batchBuffer.isEmpty { - for item in batchBuffer { - continuation.yield(item) - } - } - - continuation.finish() - } catch { - continuation.finish(throwing: error) - } - } - - continuation.onTermination = { @Sendable _ in - Task { - await controller.cancelAllWaiters() - } - } - } + let source = PulledRowSource(url: url, configuration: configuration) + return AsyncThrowingStream(unfolding: { + guard !Task.isCancelled else { return nil } + return try source.next() + }) } - /// Decodes CSV in batches with memory-aware backpressure. - /// - /// Each yielded batch respects memory limits. + /// Decodes CSV in batches of `memoryConfig.batchSize` rows, never reading ahead of the consumer. /// /// - Parameters: /// - type: The type to decode. /// - url: The file URL to read CSV data from. - /// - memoryConfig: Configuration for memory limits. - /// - Returns: An AsyncThrowingStream yielding batches of decoded values. + /// - memoryConfig: `batchSize` sets the rows per batch; the other fields are retained for + /// source compatibility. + /// - Returns: An AsyncThrowingStream yielding every row, in file order, in batches. public func decodeBatchedWithBackpressure( _ type: T.Type, from url: URL, memoryConfig: MemoryLimitConfiguration = MemoryLimitConfiguration(), ) -> AsyncThrowingStream<[T], Error> { - AsyncThrowingStream(bufferingPolicy: .bufferingNewest(4)) { continuation in - Task { - do { - var producer = try CSVRowStreamProducer(url: url, configuration: configuration) - var processor = StreamingRowProcessor(configuration: configuration) - var batch: [T] = [] - batch.reserveCapacity(memoryConfig.batchSize) - - while let row = try producer.nextRow() { - guard let value = try processor.process(row) else { continue } - batch.append(value) - - if batch.count >= memoryConfig.batchSize { - continuation.yield(batch) - batch.removeAll(keepingCapacity: true) - } - } - - if !batch.isEmpty { - continuation.yield(batch) - } - - continuation.finish() - } catch { - continuation.finish(throwing: error) - } - } - } + let source = PulledRowSource(url: url, configuration: configuration) + let batchSize = memoryConfig.batchSize + return AsyncThrowingStream(unfolding: { + guard !Task.isCancelled else { return nil } + return try source.nextBatch(limit: batchSize) + }) } } diff --git a/Sources/CSVCoder/Parsing/CSVParser.swift b/Sources/CSVCoder/Parsing/CSVParser.swift index 0c3ef1c..aab7703 100644 --- a/Sources/CSVCoder/Parsing/CSVParser.swift +++ b/Sources/CSVCoder/Parsing/CSVParser.swift @@ -350,11 +350,7 @@ public struct CSVParser: Sequence { } return pos } - let relativeQuote = SIMDScanner.findNextQuote( - buffer: baseAddress.advanced(by: cursor), - count: count - cursor, - ) - return cursor + relativeQuote + return cursor + FieldScan.nextQuote(baseAddress.advanced(by: cursor), count: count - cursor) } /// Creates a FieldResult for a quoted field. @@ -384,40 +380,28 @@ public struct CSVParser: Sequence { var cursor = startOffset var hasQuoteInField = false - // Use SIMD for fields >= 64 bytes - cursor = trySIMDAdvance(from: cursor, count: count) + // Jump from one structural byte to the next. A quote is not a terminator here, but it is + // recorded: strict mode rejects it, and the jump would otherwise skip over it. + while let baseAddress = buffer.baseAddress, cursor < count { + cursor += FieldScan.nextStructural( + baseAddress.advanced(by: cursor), count: count - cursor, delimiter: delimiter) + guard cursor < count else { break } - if cursor >= count { - // EOF reached via SIMD - check for quotes in scanned region - hasQuoteInField = checkForQuotes(from: startOffset, to: cursor) - return makeUnquotedFieldResult( - contentStart: startOffset, - contentEnd: cursor, - nextOffset: cursor, - isRowEnd: true, - hasQuoteInUnquoted: hasQuoteInField, - ) - } - - // Scalar handling for short fields or post-SIMD - while cursor < count { let byte = buffer[cursor] - if byte == CSVParser.quote { hasQuoteInField = true + cursor += 1 + continue } - if byte == delimiter || byte == CSVParser.lf || byte == CSVParser.cr { - let (nextOffset, isRowEnd) = resolveTerminator(at: cursor, count: count) - return makeUnquotedFieldResult( - contentStart: startOffset, - contentEnd: cursor, - nextOffset: nextOffset, - isRowEnd: isRowEnd, - hasQuoteInUnquoted: hasQuoteInField, - ) - } - cursor += 1 + let (nextOffset, isRowEnd) = resolveTerminator(at: cursor, count: count) + return makeUnquotedFieldResult( + contentStart: startOffset, + contentEnd: cursor, + nextOffset: nextOffset, + isRowEnd: isRowEnd, + hasQuoteInUnquoted: hasQuoteInField, + ) } // EOF @@ -430,33 +414,6 @@ public struct CSVParser: Sequence { ) } - /// Attempts SIMD-accelerated advance for unquoted fields. - /// - /// Returns the new cursor position after SIMD scanning. - @inline(__always) - private func trySIMDAdvance(from startOffset: Int, count: Int) -> Int { - let remaining = count - startOffset - guard remaining >= 64, let basePtr = buffer.baseAddress else { - return startOffset - } - - let simdOffset = SIMDScanner.findNextStructural( - buffer: basePtr.advanced(by: startOffset), - count: remaining, - delimiter: delimiter, - ) - return startOffset + simdOffset - } - - /// Checks if there are any quote characters in the specified range. - @inline(__always) - private func checkForQuotes(from start: Int, to end: Int) -> Bool { - for i in start.., count: Int, delimiter: UInt8) -> Int { + let head = min(count, inlineBytes) + var index = 0 + while index < head { + let byte = base[index] + if byte == delimiter || byte == cr || byte == lf || byte == quote { return index } + index += 1 + } + guard count > head else { return count } + return head + + AemiKernels.firstIndexOfAny( + base: base + head, count: count - head, delimiter, cr, lf, quote, quote) + } + + /// Whether `base[0.., count: Int, delimiter: UInt8) -> Bool { + let head = min(count, swarBytes) + var offset = 0 + while offset + 8 <= head { + if SWARUtils.hasAnyByte(SWARUtils.load(base + offset), quote, delimiter, cr, lf) { return true } + offset += 8 + } + while offset < head { + let byte = base[offset] + if byte == delimiter || byte == cr || byte == lf || byte == quote { return true } + offset += 1 + } + guard count > head else { return false } + return AemiKernels.firstIndexOfAny(base: base + head, count: count - head, delimiter, cr, lf, quote, quote) + < count - head + } + + /// The offset of the first quote in `base[0.., count: Int) -> Int { + let head = min(count, inlineBytes) + var index = 0 + while index < head { + if base[index] == quote { return index } + index += 1 + } + guard count > head else { return count } + return head + AemiKernels.firstIndexOfByte(base: base + head, count: count - head, needle: quote) + } +} diff --git a/Sources/CSVCoder/Parsing/PulledRowSource.swift b/Sources/CSVCoder/Parsing/PulledRowSource.swift new file mode 100644 index 0000000..e579f9c --- /dev/null +++ b/Sources/CSVCoder/Parsing/PulledRowSource.swift @@ -0,0 +1,95 @@ +// +// PulledRowSource.swift +// CSVCoder +// +// Decodes rows only when the consumer asks for them. +// + +import Foundation +import Synchronization + +/// Decodes rows from a CSV file one pull at a time, for `AsyncThrowingStream(unfolding:)`. +/// +/// A pull runs the parser inline on the caller's task, so the source never reads ahead of its +/// consumer: memory is bounded by one row (or one batch), a slow consumer cannot lose rows, and an +/// abandoned stream leaves no task decoding in the background. +/// +/// Thread safety: all state sits behind one lock. The stream calls ``next()`` serially, so the +/// lock is never contended in practice. +final class PulledRowSource: Sendable { + // MARK: Lifecycle + + init(url: URL, configuration: CSVDecoder.Configuration) { + self.configuration = configuration + state = Mutex(State(url: url, processor: StreamingRowProcessor(configuration: configuration))) + } + + // MARK: Internal + + /// Decodes the next value. + /// + /// - Returns: The next value, or `nil` at end of input and after any earlier error. + /// - Throws: The file-open error on the first call, or the parse or decode error of the row + /// that failed. Rows before it have already been returned. + /// - Complexity: O(row size) per call. + func next() throws -> T? { + try state.withLock { try $0.next(configuration: configuration) } + } + + /// Decodes up to `limit` values. + /// + /// - Parameter limit: The most values to return; at least 1. + /// - Returns: A non-empty batch, or `nil` at end of input. + /// - Throws: As ``next()``. When an error follows rows already decoded for this batch, those + /// rows are returned first and the error is thrown by the next call. + func nextBatch(limit: Int) throws -> [T]? { + try state.withLock { state in + var batch: [T] = [] + batch.reserveCapacity(limit) + do { + while batch.count < limit, let value = try state.next(configuration: configuration) { + batch.append(value) + } + } catch { + guard !batch.isEmpty else { throw error } + state.deferredError = error + } + return batch.isEmpty ? nil : batch + } + } + + // MARK: Private + + private struct State { + var url: URL? + var producer: CSVRowStreamProducer? + var processor: StreamingRowProcessor + var finished = false + var deferredError: (any Error)? + + mutating func next(configuration: CSVDecoder.Configuration) throws -> T? { + if let error = deferredError { + deferredError = nil + throw error + } + guard !finished else { return nil } + do { + if producer == nil, let url { + producer = try CSVRowStreamProducer(url: url, configuration: configuration) + self.url = nil + } + while let row = try producer?.nextRow() { + if let value = try processor.process(row) { return value } + } + finished = true + return nil + } catch { + finished = true + throw error + } + } + } + + private let configuration: CSVDecoder.Configuration + private let state: Mutex +} diff --git a/Sources/CSVCoder/Parsing/SIMDScanner.swift b/Sources/CSVCoder/Parsing/SIMDScanner.swift index 97cb5f7..2b1567c 100644 --- a/Sources/CSVCoder/Parsing/SIMDScanner.swift +++ b/Sources/CSVCoder/Parsing/SIMDScanner.swift @@ -22,9 +22,12 @@ enum SWARUtils: Sendable { UInt64(byte) &* 0x0101_0101_0101_0101 } - /// Returns a mask with high bit set for each byte matching the target. + /// Returns a mask whose lowest set byte is the first byte equal to the target. /// - /// Uses the classic "SWAR zero-byte detection" algorithm. + /// Uses the classic "SWAR zero-byte detection" algorithm. It is exact for "is there a match" + /// and for the lowest match, and nothing else: the borrow out of a zero byte also flags the byte + /// above it when that byte is 0x01, so do not count its set bits. Use ``exactMatchMask(_:target:)`` + /// to count. @inline(__always) static func findByte(_ word: UInt64, target: UInt8) -> UInt64 { let broadcast = broadcast(target) @@ -33,6 +36,17 @@ enum SWARUtils: Sendable { return (xored &- 0x0101_0101_0101_0101) & ~xored & 0x8080_8080_8080_8080 } + /// Returns a mask with the high bit set in exactly the bytes equal to the target. + /// + /// The low seven bits are added without a carry out of any byte and the high bit is OR-ed back + /// in, so no byte influences its neighbour. One operation dearer than ``findByte(_:target:)``. + @inline(__always) + static func exactMatchMask(_ word: UInt64, target: UInt8) -> UInt64 { + let xored = word ^ broadcast(target) + let low7: UInt64 = 0x7F7F_7F7F_7F7F_7F7F + return ~(((xored & low7) &+ low7) | xored) & 0x8080_8080_8080_8080 + } + /// Checks if any byte in the word matches any of the four targets. @inline(__always) static func hasAnyByte(_ word: UInt64, _ t1: UInt8, _ t2: UInt8, _ t3: UInt8, _ t4: UInt8) -> Bool { @@ -85,13 +99,6 @@ struct SIMDScanner: Sendable { var isQuote: Bool { byte == SIMDScanner.quote } var isComma: Bool { byte == SIMDScanner.comma } var isNewline: Bool { byte == SIMDScanner.cr || byte == SIMDScanner.lf } - - /// Returns true when this position is the configured field separator. - /// - /// Callers must pass the actual delimiter byte; the property version - /// that hardcoded comma+tab was removed because it silently lied about - /// configured non-comma delimiters such as semicolon. - func isDelimiter(_ delimiter: UInt8) -> Bool { byte == delimiter } } /// Result of scanning a buffer for row boundaries. @@ -273,7 +280,7 @@ struct SIMDScanner: Sendable { // SWAR fallback for 8-63 remaining bytes while offset + 8 <= count { let word = SWARUtils.load(buffer.advanced(by: offset)) - let lfMask = SWARUtils.findByte(word, target: lf) + let lfMask = SWARUtils.exactMatchMask(word, target: lf) // Count high bits set (each match has 0x80 pattern) total += (lfMask / 0x80).nonzeroBitCount offset += 8 @@ -290,144 +297,6 @@ struct SIMDScanner: Sendable { return total } - // MARK: - Fast Field Boundary Detection - - /// Finds the next delimiter, newline, or quote in a buffer using SIMD. - /// - /// Used for fast unquoted field parsing. - /// - /// - Parameters: - /// - buffer: Pointer to start of search. - /// - count: Number of bytes to search. - /// - delimiter: The field delimiter byte. - /// - Returns: Offset of first structural character, or count if none found. - @inline(__always) - static func findNextStructural( - buffer: UnsafePointer, - count: Int, - delimiter: UInt8, - ) -> Int { - var offset = 0 - - // Process 64 bytes at a time using SIMD - while offset + 64 <= count { - let chunk = loadSIMD64(from: buffer.advanced(by: offset)) - - let delimVec = SIMD64(repeating: delimiter) - let crVec = SIMD64(repeating: cr) - let lfVec = SIMD64(repeating: lf) - - let delimMask = chunk .== delimVec - let crMask = chunk .== crVec - let lfMask = chunk .== lfVec - - let structuralMask = delimMask .| crMask .| lfMask - - // Linear scan - exits early on first hit - for i in 0..<64 where structuralMask[i] { - return offset + i - } - - offset += 64 - } - - // Scalar fallback for remaining bytes - while offset < count { - let byte = buffer[offset] - if byte == delimiter || byte == cr || byte == lf { - return offset - } - offset += 1 - } - - return count - } - - /// Finds the position of the first quote character using SIMD. - /// - /// Returns count if no quote is found. - @inline(__always) - static func findNextQuote( - buffer: UnsafePointer, - count: Int, - ) -> Int { - var offset = 0 - - // Process 64 bytes at a time using SIMD - while offset + 64 <= count { - let chunk = loadSIMD64(from: buffer.advanced(by: offset)) - let quoteVec = SIMD64(repeating: quote) - let quoteMask = chunk .== quoteVec - - // Linear scan - exits early on first hit - for i in 0..<64 where quoteMask[i] { - return offset + i - } - - offset += 64 - } - - // SWAR fallback for 8-63 remaining bytes - while offset + 8 <= count { - let word = SWARUtils.load(buffer.advanced(by: offset)) - let quoteMask = SWARUtils.findByte(word, target: quote) - - if let idx = SWARUtils.firstMatchIndex(quoteMask) { - return offset + idx - } - - offset += 8 - } - - // Scalar fallback for remaining 0-7 bytes - while offset < count { - if buffer[offset] == quote { - return offset - } - offset += 1 - } - - return count - } - - /// Shared SWAR + scalar tail for the field-quoting byte scan. - /// - /// The - /// SIMD-path (after the main 64-byte loop) and the small-field path in - /// ``CSVFieldEscaper`` both terminate in this exact loop pair; lifting - /// it here keeps one canonical implementation of the unrolled + - /// scalar fall-back. - @inline(__always) - static func scanForQuotingBytes( - buffer: UnsafePointer, - from startOffset: Int, - count: Int, - delimiter: UInt8, - ) -> Bool { - let quote: UInt8 = 0x22 - let lf: UInt8 = 0x0A - let cr: UInt8 = 0x0D - var offset = startOffset - - while offset + 8 <= count { - let word = SWARUtils.load(buffer.advanced(by: offset)) - if SWARUtils.hasAnyByte(word, quote, delimiter, lf, cr) { - return true - } - offset += 8 - } - - while offset < count { - let byte = buffer[offset] - if byte == quote || byte == delimiter || byte == lf || byte == cr { - return true - } - offset += 1 - } - - return false - } - // MARK: Private // CSV structural bytes (ASCII) @@ -435,5 +304,4 @@ struct SIMDScanner: Sendable { private static let comma: UInt8 = 0x2C // , private static let cr: UInt8 = 0x0D // \r private static let lf: UInt8 = 0x0A // \n - private static let tab: UInt8 = 0x09 // \t } diff --git a/Sources/CSVCoder/Utilities/CSVUtilities.swift b/Sources/CSVCoder/Utilities/CSVUtilities.swift index 12e01ff..7f65cf8 100644 --- a/Sources/CSVCoder/Utilities/CSVUtilities.swift +++ b/Sources/CSVCoder/Utilities/CSVUtilities.swift @@ -316,21 +316,14 @@ enum CSVFieldEscaper: Sendable { /// Checks if a field needs quoting per RFC 4180 using raw pointer. /// - /// Uses SWAR for medium-sized fields, SIMD for large ones. - /// /// - Parameters: /// - buffer: Pointer to UTF-8 bytes. /// - count: Number of bytes. /// - delimiter: The field delimiter byte. - /// - Returns: `true` if the field contains characters requiring quoting. + /// - Returns: `true` if the field contains the delimiter, a quote, CR or LF. @inline(__always) static func needsQuoting(buffer: UnsafePointer, count: Int, delimiter: UInt8) -> Bool { - // Use SIMD for large fields; the SWAR+scalar tail lives on - // SIMDScanner so both size buckets share one implementation. - if count >= 64 { - return SIMDScanner.needsQuoting(buffer: buffer, count: count, delimiter: delimiter) - } - return SIMDScanner.scanForQuotingBytes(buffer: buffer, from: 0, count: count, delimiter: delimiter) + FieldScan.containsStructural(buffer, count: count, delimiter: delimiter) } /// Checks if a field needs quoting per RFC 4180. diff --git a/Sources/CSVCoderBenchmarks/HardwareInfo.swift b/Sources/CSVCoderBenchmarks/HardwareInfo.swift index b3406d4..b4ee871 100644 --- a/Sources/CSVCoderBenchmarks/HardwareInfo.swift +++ b/Sources/CSVCoderBenchmarks/HardwareInfo.swift @@ -91,35 +91,4 @@ struct HardwareInfo: Sendable { print(separator) print() } - - func markdownSummary() -> String { - var lines: [String] = [] - lines.append("**Benchmark Environment:**") - lines.append("- CPU: \(cpuModel)") - if cpuPerformanceCores > 0 || cpuEfficiencyCores > 0 { - lines.append("- Cores: \(cpuCores) (\(cpuPerformanceCores) performance + \(cpuEfficiencyCores) efficiency)") - } else { - lines.append("- Cores: \(cpuCores)") - } - lines.append("- Memory: \(String(format: "%.0f", physicalMemoryGB)) GB") - lines.append("- OS: \(osVersion)") - lines.append("- Swift: \(swiftVersion)") - lines.append("- Build: \(buildConfiguration)") - return lines.joined(separator: "\n") - } - - func jsonSummary() -> String { - """ - { - "cpu_model": "\(cpuModel)", - "cpu_cores": \(cpuCores), - "cpu_performance_cores": \(cpuPerformanceCores), - "cpu_efficiency_cores": \(cpuEfficiencyCores), - "memory_gb": \(String(format: "%.1f", physicalMemoryGB)), - "os_version": "\(osVersion)", - "swift_version": "\(swiftVersion)", - "build_configuration": "\(buildConfiguration)" - } - """ - } } diff --git a/Sources/CSVCoderBenchmarks/main.swift b/Sources/CSVCoderBenchmarks/main.swift index b34abd0..e267bbb 100644 --- a/Sources/CSVCoderBenchmarks/main.swift +++ b/Sources/CSVCoderBenchmarks/main.swift @@ -802,6 +802,26 @@ benchmark("Decode 100K from file (parallel)") { precondition(count == 100_000) } +benchmark("Stream 100K from file (backpressure, rows)") { + let count = try runAsync { + var n = 0 + for try await _ in CSVDecoder().decodeWithBackpressure(SimpleRecord.self, from: parallelTempURL) { n += 1 } + return n + } + precondition(count == 100_000, "stream delivered \(count) of 100000 rows") +} + +benchmark("Stream 100K from file (backpressure, batches)") { + let count = try runAsync { + var n = 0 + for try await batch in CSVDecoder().decodeBatchedWithBackpressure(SimpleRecord.self, from: parallelTempURL) { + n += batch.count + } + return n + } + precondition(count == 100_000, "stream delivered \(count) of 100000 rows") +} + benchmark("Encode 100K to file (parallel)") { _ = try runAsync { let tempURL = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString + ".csv") diff --git a/Tests/CSVCoderTests/CSVCodeReviewFixTests.swift b/Tests/CSVCoderTests/CSVCodeReviewFixTests.swift index aea8945..51a3dc4 100644 --- a/Tests/CSVCoderTests/CSVCodeReviewFixTests.swift +++ b/Tests/CSVCoderTests/CSVCodeReviewFixTests.swift @@ -242,32 +242,4 @@ struct CSVCodeReviewFixTests { #expect(rows.count == 3) #expect(rows[1] == ["Alice", "30"]) } - - // MARK: - Task 3: BackpressureController cancelAllWaiters - - @Test("BackpressureController cancelAllWaiters resets state") - func backpressureCancelAllWaiters() async { - // Use tiny budget so highWaterRows is small - let config = CSVDecoder.MemoryLimitConfiguration( - memoryBudget: 1024 * 1024, - estimatedRowSize: 256, - batchSize: 10, - useWatermarks: false, - ) - let controller = BackpressureController(config: config) - - // maxBufferedRows = 1MB / 256 = 4096, useWatermarks=false so pauses at maxBufferedRows - let shouldPause = await controller.recordProduced(5000) - #expect(shouldPause) - - let state = await controller.state - #expect(state.isPaused) - - // Cancel should reset - await controller.cancelAllWaiters() - - let stateAfter = await controller.state - #expect(!stateAfter.isPaused) - #expect(stateAfter.buffered == 0) - } } diff --git a/Tests/CSVCoderTests/CSVDecoderBackpressureTests.swift b/Tests/CSVCoderTests/CSVDecoderBackpressureTests.swift new file mode 100644 index 0000000..5de8d63 --- /dev/null +++ b/Tests/CSVCoderTests/CSVDecoderBackpressureTests.swift @@ -0,0 +1,139 @@ +// +// CSVDecoderBackpressureTests.swift +// CSVCoder +// +// The backpressure streams must deliver every row to a consumer of any speed, and must not read +// ahead of it. Formal model: formal/BackpressureOld.tla (deadlock) and BackpressureNew.tla. +// + +import Foundation +import Testing + +@testable import CSVCoder + +@Suite("CSVDecoder backpressure delivery") +struct CSVDecoderBackpressureTests { + struct NameAge: Codable, Equatable, Sendable { + let name: String + let age: Int + } + + private static func makeFile(rows: Int, badRowAt: Int? = nil) throws -> URL { + var csv = "name,age\n" + for i in 0.. Int { + var acc = 0 + for i in 0..= 5) } - // MARK: - Test 2: BackpressureController.cancelAllWaiters resumes pending continuations - - @Test("cancelAllWaiters resumes pending continuations without hanging") - func cancelAllWaitersResumesPendingContinuations() async { - // Use a tiny memory budget so the controller hits the high-water mark - // after just a few rows, parking the producer in waitForSpace(). - let config = CSVDecoder.MemoryLimitConfiguration( - memoryBudget: 1024 * 1024, // 1 MB - estimatedRowSize: 512 * 1024, // 512 KB per row — 2 rows fill the budget - batchSize: 1, - useWatermarks: false, - ) - let controller = BackpressureController(config: config) - - // Fill the buffer past the limit so the controller is paused. - let shouldPause = await controller.recordProduced(config.maxBufferedRows + 1) - #expect(shouldPause) - - // Park a waiter in the background; it must resume once cancelAllWaiters() fires. - let waiterCompleted = Task { - await controller.waitForSpace() - } - - // Give the waiter task time to actually suspend on the continuation before - // we call cancelAllWaiters. We yield a few times rather than sleeping so the - // test stays deterministic. - for _ in 0..<5 { - await Task.yield() - } - - // Cancel all waiters — the waiter task must unblock. - await controller.cancelAllWaiters() - - // If cancelAllWaiters works correctly this returns immediately; - // a continuation leak would cause the task to hang and eventually time out. - await waiterCompleted.value - - // The controller should have been reset. - let stateAfter = await controller.state - #expect(stateAfter.isPaused == false) - #expect(stateAfter.buffered == 0) - } - // MARK: - Test 3: Backpressure stream task cancellation triggers onTermination cleanup @Test("Cancelling a backpressure stream triggers cleanup and does not hang") diff --git a/Tests/CSVCoderTests/CSVDecoderParallelTests.swift b/Tests/CSVCoderTests/CSVDecoderParallelTests.swift index 7985ee6..fe37520 100644 --- a/Tests/CSVCoderTests/CSVDecoderParallelTests.swift +++ b/Tests/CSVCoderTests/CSVDecoderParallelTests.swift @@ -182,6 +182,14 @@ struct CSVDecoderParallelTests { #expect(totalRecords == 100) } + private static var isOptimizedBuild: Bool { + #if DEBUG + false + #else + true + #endif + } + @Test("Parallel decode is faster than sequential for large data") func parallelDecodeFasterThanSequential() async throws { // Generate large dataset (10K rows with complex fields) @@ -230,9 +238,12 @@ struct CSVDecoderParallelTests { #expect(sequentialResult.count == 10000) #expect(parallelResult.count == 10000) - // On multi-core machines, parallel should be faster + // On multi-core machines, parallel should be faster. Only an optimized build says anything about + // speed: unoptimized, the sequential path now runs 5x faster than before FieldScan (387 -> 77 ms + // on the CI runner) while the allocation-bound parallel path does not (257 -> 196 ms), so the + // ratio there describes the debug build. The release job runs this assertion. let coreCount = ProcessInfo.processInfo.activeProcessorCount - if coreCount > 1 { + if coreCount > 1, Self.isOptimizedBuild { let seqNanos = Double(sequentialDuration.components.seconds) * 1e9 + Double(sequentialDuration.components.attoseconds) / 1e9 @@ -356,7 +367,6 @@ struct CSVDecoderParallelTests { #expect(config.batchSize == 1000) #expect(config.highWaterMark == 0.8) #expect(config.lowWaterMark == 0.4) - #expect(config.maxBufferedRows > 0) } @Test("Parallel configuration defaults") diff --git a/Tests/CSVCoderTests/CSVParserQuoteInUnquotedFieldTests.swift b/Tests/CSVCoderTests/CSVParserQuoteInUnquotedFieldTests.swift new file mode 100644 index 0000000..457a6de --- /dev/null +++ b/Tests/CSVCoderTests/CSVParserQuoteInUnquotedFieldTests.swift @@ -0,0 +1,41 @@ +// +// CSVParserQuoteInUnquotedFieldTests.swift +// CSVCoder +// +// Strict mode rejects a quote inside an unquoted field (RFC 4180). The parser must report it +// wherever the field sits in the buffer, not only in the last 64 bytes. +// + +import Foundation +import Testing + +@testable import CSVCoder + +@Suite("CSVParser quote in an unquoted field") +struct CSVParserQuoteInUnquotedFieldTests { + private static func flags(of csv: String) -> [Bool] { + let bytes = Array(csv.utf8) + return bytes.withUnsafeBufferPointer { buffer in + CSVParser(buffer: buffer, delimiter: 0x2C).map(\.hasQuoteInUnquotedField) + } + } + + @Test("Every row with a stray quote is flagged, early or late in the buffer", arguments: [1, 3, 20, 200]) + func strayQuoteIsFlaggedInEveryRow(rows: Int) { + let csv = String(repeating: "ab\"cd,ef\n", count: rows) + #expect(Self.flags(of: csv) == Array(repeating: true, count: rows)) + } + + @Test("A stray quote after a long unquoted prefix is flagged", arguments: [10, 63, 64, 65, 200]) + func strayQuoteAfterPrefixIsFlagged(prefix: Int) { + let field = String(repeating: "x", count: prefix) + "\"y" + let csv = "\(field),b\n\(field),b\n" + #expect(Self.flags(of: csv) == [true, true]) + } + + @Test("A well-formed row is not flagged, and neither is a quoted field with an escaped quote") + func wellFormedRowsAreNotFlagged() { + let csv = String(repeating: "abc,\"d\"\"e\",fgh\n", count: 50) + #expect(Self.flags(of: csv) == Array(repeating: false, count: 50)) + } +} diff --git a/Tests/CSVCoderTests/FieldScanTests.swift b/Tests/CSVCoderTests/FieldScanTests.swift new file mode 100644 index 0000000..71a86e4 --- /dev/null +++ b/Tests/CSVCoderTests/FieldScanTests.swift @@ -0,0 +1,108 @@ +// +// FieldScanTests.swift +// CSVCoder +// +// FieldScan must agree with a byte-by-byte search at every length and every position of the match, +// across the boundary where it hands over from the inline scan to the vector kernel. +// + +import Testing + +@testable import CSVCoder + +@Suite("FieldScan") +struct FieldScanTests { + private static func nextStructural(_ bytes: [UInt8], delimiter: UInt8) -> Int { + bytes.withUnsafeBufferPointer { buffer in + guard let base = buffer.baseAddress else { return 0 } + return FieldScan.nextStructural(base, count: buffer.count, delimiter: delimiter) + } + } + + private static func nextQuote(_ bytes: [UInt8]) -> Int { + bytes.withUnsafeBufferPointer { buffer in + guard let base = buffer.baseAddress else { return 0 } + return FieldScan.nextQuote(base, count: buffer.count) + } + } + + @Test("The first structural byte is found at every length and position", arguments: [0x2C, 0x3B, 0x09] as [UInt8]) + func structuralAtEveryPosition(delimiter: UInt8) { + let others: [UInt8] = [delimiter, 0x0D, 0x0A, 0x22] + // One expectation for the whole sweep: thousands of #expect calls in an unoptimized build would keep + // a core busy long enough to disturb the wall-clock tests that run beside this one. + var failures: [String] = [] + for length in 0...70 { + for position in 0.. Bool { + bytes.withUnsafeBufferPointer { buffer in + guard let base = buffer.baseAddress else { return false } + return FieldScan.containsStructural(base, count: buffer.count, delimiter: 0x2C) + } + } + var failures: [String] = [] + for length in 0...140 { + if contains([UInt8](repeating: 0x61, count: length)) { failures.append("clean length \(length)") } + // 0x2B is one below the delimiter. + if contains([UInt8](repeating: 0x2B, count: length)) { failures.append("lookalike length \(length)") } + for position in 0.. Int { + bytes.withUnsafeBufferPointer { buffer in + guard let base = buffer.baseAddress else { return 0 } + return SIMDScanner.countNewlinesApprox(buffer: base, count: buffer.count) + } + } + + @Test("An LF followed by a byte one above it is counted once", arguments: [8, 9, 15, 63]) + func lfThenVerticalTab(length: Int) { + var bytes = [UInt8](repeating: 0x41, count: length) + bytes[0] = 0x0A + bytes[1] = 0x0B // 0x0A ^ 0x0A = 0, 0x0B ^ 0x0A = 1: the borrow from the first byte flags the second + #expect(Self.count(bytes) == 1) + } + + @Test("The count equals a scalar count on random bytes at every length", arguments: 0...130) + func matchesScalarCount(length: Int) { + var generator = SystemRandomNumberGenerator() + // Bias towards 0x09...0x0C so neighbours of LF are common. + let bytes = (0..