Move runtime constants to dynamic facts render

PiperOrigin-RevId: 505172527

pkg/sync/BUILD

@@ -28,6 +28,14 @@ arch_genrule(
     template = "runtime_spinning_impl_%s.s",
 )
 
+# Architecture-independent constants.
+nogo_facts(
+    name = "runtime_constants_impl",
+    srcs = ["runtime.go"],
+    output = "runtime_constants_impl.go",
+    template = "runtime_constants.tmpl",
+)
+
 go_library(
     name = "sync",
     srcs = [
@@ -49,6 +57,7 @@ go_library(
         "rwmutex_unsafe.go",
         "seqcount.go",
         "sync.go",
+        ":runtime_constants_impl",
         ":runtime_spinning_impl_arch",
     ],
     marshal = False,

pkg/sync/runtime_constants.tmpl

@@ -0,0 +1,29 @@
+// Copyright 2023 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sync
+
+// Values for the reason argument to gopark, from Go's src/runtime/runtime2.go.
+const (
+	WaitReasonSelect      uint8 = {{ .import.runtime.Constants.waitReasonSelect }}
+	WaitReasonChanReceive uint8 = {{ .import.runtime.Constants.waitReasonChanReceive }}
+	WaitReasonSemacquire  uint8 = {{ .import.runtime.Constants.waitReasonSemacquire }}
+)
+
+// Values for the traceEv argument to gopark, from Go's src/runtime/trace.go.
+const (
+	TraceEvGoBlockRecv   byte = {{ .import.runtime.Constants.traceEvGoBlockRecv }}
+	TraceEvGoBlockSelect byte = {{ .import.runtime.Constants.traceEvGoBlockSelect }}
+	TraceEvGoBlockSync   byte = {{ .import.runtime.Constants.traceEvGoBlockSync }}
+)

pkg/sync/runtime_unsafe.go

@@ -78,20 +78,6 @@ func Goready(gp uintptr, traceskip int, wakep bool) {
 	}
 }
 
-// Values for the reason argument to gopark, from Go's src/runtime/runtime2.go.
-const (
-	WaitReasonSelect      uint8 = 9
-	WaitReasonChanReceive uint8 = 14
-	WaitReasonSemacquire  uint8 = 18
-)
-
-// Values for the traceEv argument to gopark, from Go's src/runtime/trace.go.
-const (
-	TraceEvGoBlockRecv   byte = 23
-	TraceEvGoBlockSelect byte = 24
-	TraceEvGoBlockSync   byte = 25
-)
-
 // Rand32 returns a non-cryptographically-secure random uint32.
 func Rand32() uint32 {
 	return fastrand()