[K/N] Add signposts to safepoints ^KT-62689

Disabled by default.

Merge-request: KT-MR-12679
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/BinaryOptions.kt

@@ -66,6 +66,8 @@ object BinaryOptions : BinaryOptionRegistry() {
     val disableMmap by booleanOption()
 
     val disableAllocatorOverheadEstimate by booleanOption()
+
+    val enableSafepointSignposts by booleanOption()
 }
 
 open class BinaryOption<T : Any>(

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanConfig.kt

@@ -242,6 +242,12 @@ class KonanConfig(val project: Project, val configuration: CompilerConfiguration
         configuration.get(BinaryOptions.objcDisposeOnMain) ?: true
     }
 
+    val enableSafepointSignposts: Boolean = configuration.get(BinaryOptions.enableSafepointSignposts)?.also {
+        if (it && !target.supportsSignposts) {
+            configuration.report(CompilerMessageSeverity.STRONG_WARNING, "Signposts are not available on $target. The setting will have no effect.")
+        }
+    } ?: false
+
     init {
         if (!platformManager.isEnabled(target)) {
             error("Target ${target.visibleName} is not available on the ${HostManager.hostName} host")

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/IrToBitcode.kt

@@ -2833,6 +2833,7 @@ internal class CodeGeneratorVisitor(
         overrideRuntimeGlobal("Kotlin_mimallocUseDefaultOptions", llvm.constInt32(if (context.config.mimallocUseDefaultOptions) 1 else 0))
         overrideRuntimeGlobal("Kotlin_mimallocUseCompaction", llvm.constInt32(if (context.config.mimallocUseCompaction) 1 else 0))
         overrideRuntimeGlobal("Kotlin_objcDisposeOnMain", llvm.constInt32(if (context.config.objcDisposeOnMain) 1 else 0))
+        overrideRuntimeGlobal("Kotlin_enableSafepointSignposts", llvm.constInt32(if (context.config.enableSafepointSignposts) 1 else 0))
     }
 
     //-------------------------------------------------------------------------//