Swift 6 preparedness (#54)

Motivation

We should feel confident that we compile clean under the strict
checks of Swift 6. As this is a data-processing-only framework
it's not a surprise that it turns out to be fine, but this patch
adds the necessary docker-compose steps to ensure it continues
to work.

Modifications

- Add docker-compose file for Swift 6 nightlies
- Extend docker-compose to pass explicit sendable and strict
    concurrency checks
- Add those checks to 6.0 and main nightlies

Result

Better confidence that we don't break our downstreams in Swift 6
support.

Benchmarks/Benchmarks/SwiftASN1Benchmark/Benchmarks.swift

@@ -23,8 +23,6 @@ let benchmarks = {
             .readSyscalls,
             .writeSyscalls,
             .memoryLeaked,
-            .retainCount,
-            .releaseCount,
         ]
     )
 

Benchmarks/Thresholds/5.10/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_PEM_to_PEMDocument.p90.json

@@ -1,8 +1,6 @@
 {
-  "mallocCountTotal" : 960,
+  "mallocCountTotal" : 976,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 13983,
-  "retainCount" : 12200,
   "writeSyscalls" : 0
 }

Benchmarks/Thresholds/5.10/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_multi_PEM_to_PEMDocument_.p90.json

@@ -2,7 +2,5 @@
   "mallocCountTotal" : 967,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 12900,
-  "retainCount" : 11382,
   "writeSyscalls" : 0
 }

Benchmarks/Thresholds/5.8/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_PEM_to_PEMDocument.p90.json

@@ -1,8 +1,6 @@
 {
-  "mallocCountTotal" : 960,
+  "mallocCountTotal" : 976,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 17688,
-  "retainCount" : 15905,
   "writeSyscalls" : 0
 }

Benchmarks/Thresholds/5.8/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_multi_PEM_to_PEMDocument_.p90.json

@@ -2,7 +2,5 @@
   "mallocCountTotal" : 967,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 16605,
-  "retainCount" : 15087,
   "writeSyscalls" : 0
 }

Benchmarks/Thresholds/5.9/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_PEM_to_PEMDocument.p90.json

@@ -1,8 +1,6 @@
 {
-  "mallocCountTotal" : 960,
+  "mallocCountTotal" : 976,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 13846,
-  "retainCount" : 12063,
   "writeSyscalls" : 0
 }

Benchmarks/Thresholds/5.9/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_multi_PEM_to_PEMDocument_.p90.json

@@ -2,7 +2,5 @@
   "mallocCountTotal" : 967,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 12763,
-  "retainCount" : 11245,
   "writeSyscalls" : 0
 }

Benchmarks/Thresholds/main/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_PEM_to_PEMDocument.p90.json

@@ -1,8 +1,6 @@
 {
-  "mallocCountTotal" : 960,
+  "mallocCountTotal" : 976,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 13983,
-  "retainCount" : 12200,
   "writeSyscalls" : 0
 }

Benchmarks/Thresholds/main/SwiftASN1Benchmark.Parse_WebPKI_Roots_from_multi_PEM_to_PEMDocument_.p90.json

@@ -2,7 +2,5 @@
   "mallocCountTotal" : 967,
   "memoryLeaked" : 0,
   "readSyscalls" : 0,
-  "releaseCount" : 12900,
-  "retainCount" : 11382,
   "writeSyscalls" : 0
 }

docker/docker-compose.2204.60.yaml

@@ -0,0 +1,28 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-asn1:22.04-6.0
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-6.0-jammy"
+
+  test:
+    image: swift-asn1:22.04-6.0
+    environment:
+      - SWIFT_VERSION=6.0
+      - WARN_AS_ERROR_ARG=-Xswiftc -warnings-as-errors
+      - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
+      - EXPLICIT_SENDABLE_ARG=-Xswiftc -require-explicit-sendable
+      - STRICT_CONCURRENCY_ARG=-Xswiftc -strict-concurrency=complete
+      # - SANITIZER_ARG=--sanitize=thread # TSan broken still
+
+  shell:
+    image: swift-asn1:22.04-6.0
+
+  update-benchmark-baseline:
+    image: swift-asn1:22.04-6.0
+    environment:
+      - SWIFT_VERSION=6.0
+

docker/docker-compose.2204.main.yaml

@@ -14,6 +14,8 @@ services:
       - SWIFT_VERSION=main
       - WARN_AS_ERROR_ARG=-Xswiftc -warnings-as-errors
       - IMPORT_CHECK_ARG=--explicit-target-dependency-import-check error
+      - EXPLICIT_SENDABLE_ARG=-Xswiftc -require-explicit-sendable
+      - STRICT_CONCURRENCY_ARG=-Xswiftc -strict-concurrency=complete
       # - SANITIZER_ARG=--sanitize=thread # TSan broken still
 
   shell:

docker/docker-compose.yaml

@@ -25,7 +25,7 @@ services:
 
   test:
     <<: *common
-    command: /bin/bash -xcl "swift $${SWIFT_TEST_VERB-test} $${WARN_AS_ERROR_ARG-} $${SANITIZER_ARG-} $${IMPORT_CHECK_ARG-} && cd Benchmarks && swift package benchmark baseline check --check-absolute-path Thresholds/$${SWIFT_VERSION-}/"
+    command: /bin/bash -xcl "swift $${SWIFT_TEST_VERB-test} $${WARN_AS_ERROR_ARG-} $${SANITIZER_ARG-} $${IMPORT_CHECK_ARG-} $${EXPLICIT_SENDABLE_ARG-} $${STRICT_CONCURRENCY_ARG} && cd Benchmarks && swift package benchmark baseline check --check-absolute-path Thresholds/$${SWIFT_VERSION-}/"
 
   update-benchmark-baseline:
     <<: *common
@@ -36,3 +36,4 @@ services:
   shell:
     <<: *common
     entrypoint: /bin/bash
+