8347408: Create an internal method handle adapter for system calls with errno

src/java.base/share/classes/java/lang/foreign/SegmentAllocator.java

@@ -27,6 +27,7 @@
 
 import jdk.internal.foreign.AbstractMemorySegmentImpl;
 import jdk.internal.foreign.ArenaImpl;
+import jdk.internal.foreign.NoInitSegmentAllocator;
 import jdk.internal.foreign.SlicingAllocator;
 import jdk.internal.foreign.StringSupport;
 import jdk.internal.vm.annotation.ForceInline;
@@ -720,22 +721,22 @@ private static void assertWritable(MemorySegment segment) {
 
     @ForceInline
     private MemorySegment allocateNoInit(long byteSize) {
-        return this instanceof ArenaImpl arenaImpl ?
-                arenaImpl.allocateNoInit(byteSize, 1) :
+        return this instanceof NoInitSegmentAllocator noInit ?
+                noInit.allocateNoInit(byteSize, 1) :
                 allocate(byteSize);
     }
 
     @ForceInline
     private MemorySegment allocateNoInit(MemoryLayout layout) {
-        return this instanceof ArenaImpl arenaImpl ?
-                arenaImpl.allocateNoInit(layout.byteSize(), layout.byteAlignment()) :
+        return this instanceof NoInitSegmentAllocator noInit ?
+                noInit.allocateNoInit(layout.byteSize(), layout.byteAlignment()) :
                 allocate(layout);
     }
 
     @ForceInline
     private MemorySegment allocateNoInit(MemoryLayout layout, long size) {
-        return this instanceof ArenaImpl arenaImpl ?
-                arenaImpl.allocateNoInit(layout.byteSize() * size, layout.byteAlignment()) :
+        return this instanceof NoInitSegmentAllocator noInit ?
+                noInit.allocateNoInit(layout.byteSize() * size, layout.byteAlignment()) :
                 allocate(layout, size);
     }
 }

src/java.base/share/classes/jdk/internal/foreign/ArenaImpl.java

@@ -25,10 +25,12 @@
 
 package jdk.internal.foreign;
 
+import jdk.internal.vm.annotation.ForceInline;
+
 import java.lang.foreign.Arena;
 import java.lang.foreign.MemorySegment.Scope;
 
-public final class ArenaImpl implements Arena {
+public final class ArenaImpl implements Arena, NoInitSegmentAllocator {
 
     private final MemorySessionImpl session;
     private final boolean shouldReserveMemory;
@@ -47,15 +49,16 @@ public void close() {
         session.close();
     }
 
+    @ForceInline
+    @Override
     public NativeMemorySegmentImpl allocateNoInit(long byteSize, long byteAlignment) {
         Utils.checkAllocationSizeAndAlign(byteSize, byteAlignment);
         return SegmentFactories.allocateSegment(byteSize, byteAlignment, session, shouldReserveMemory);
     }
 
+    @ForceInline
     @Override
     public NativeMemorySegmentImpl allocate(long byteSize, long byteAlignment) {
-        NativeMemorySegmentImpl segment = allocateNoInit(byteSize, byteAlignment);
-        segment.fill((byte)0);
-        return segment;
+        return NoInitSegmentAllocator.super.allocate(byteSize, byteAlignment);
     }
 }