diff --git a/src/main/java/com/yasuenag/ffmasm/CodeSegment.java b/src/main/java/com/yasuenag/ffmasm/CodeSegment.java
index 04a16eb..c78ff91 100644
--- a/src/main/java/com/yasuenag/ffmasm/CodeSegment.java
+++ b/src/main/java/com/yasuenag/ffmasm/CodeSegment.java
@@ -49,7 +49,7 @@ public class CodeSegment implements AutoCloseable{
   /**
    * Holder for method information. This is used for perfmap dumping.
    */
-  public static record MethodInfo(MethodHandle methodHandle, String name, long address, int size){
+  public static record MethodInfo(String name, long address, int size){
     @Override
     public String toString(){
       return String.format("0x%x 0x%x %s", address, size, name);
@@ -189,18 +189,17 @@ public MemorySegment getAddr(){
 
   /**
    * Add method info. It will be dumped to perf map as related method of this CodeSegment.
-   * @param mh MethodHandle of the method
    * @param name Method name
    * @param address Address of the method
    * @param size Size of the method (machine code)
    * @return MethodInfo of the method info.
    * @throws IllegalArgumentException if the address is out of range from this CodeSegment.
    */
-  public MethodInfo addMethodInfo(MethodHandle mh, String name, long address, int size){
+  public MethodInfo addMethodInfo(String name, long address, int size){
     if((address < addr.address()) || ((addr.address() + this.size) < (address + size))){
       throw new IllegalArgumentException("Address is out of range from CodeSegment.");
     }
-    var methodInfo = new MethodInfo(mh, name, address, size);
+    var methodInfo = new MethodInfo(name, address, size);
     methods.add(methodInfo);
     return methodInfo;
   }
diff --git a/src/main/java/com/yasuenag/ffmasm/amd64/AMD64AsmBuilder.java b/src/main/java/com/yasuenag/ffmasm/amd64/AMD64AsmBuilder.java
index 371d803..e1bd88d 100644
--- a/src/main/java/com/yasuenag/ffmasm/amd64/AMD64AsmBuilder.java
+++ b/src/main/java/com/yasuenag/ffmasm/amd64/AMD64AsmBuilder.java
@@ -986,6 +986,15 @@ public MethodHandle build(String name, Linker.Option... options){
     return build(name, null, options);
   }
 
+  private void storeMethodInfo(String name, JitDump jitdump){
+    var top = mem.address();
+    var size = byteBuf.position();
+    var methodInfo = seg.addMethodInfo(name, top, size);
+    if(jitdump != null){
+      jitdump.writeFunction(methodInfo);
+    }
+  }
+
   /**
    * Build as a MethodHandle
    *
@@ -997,24 +1006,42 @@ public MethodHandle build(String name, Linker.Option... options){
    */
   public MethodHandle build(String name, JitDump jitdump, Linker.Option... options){
     updateTail();
-    var top = mem.address();
-    var size = byteBuf.position();
-    var mh = Linker.nativeLinker().downcallHandle(mem, desc, options);
-
-    var methodInfo = seg.addMethodInfo(mh, name, top, size);
-    if(jitdump != null){
-      jitdump.writeFunction(methodInfo);
-    }
-    return mh;
+    storeMethodInfo(name, jitdump);
+    return Linker.nativeLinker().downcallHandle(mem, desc, options);
   }
 
   /**
    * Get MemorySegment which is associated with this builder.
    *
    * @return MemorySegment of this builder
+   * @throws IllegalStateException when label(s) are not defined even if they are used
    */
   public MemorySegment getMemorySegment(){
+    return getMemorySegment("<unnamed>");
+  }
+
+  /**
+   * Get MemorySegment which is associated with this builder.
+   *
+   * @param name Method name
+   * @return MemorySegment of this builder
+   * @throws IllegalStateException when label(s) are not defined even if they are used
+   */
+  public MemorySegment getMemorySegment(String name){
+    return getMemorySegment(name, null);
+  }
+
+  /**
+   * Get MemorySegment which is associated with this builder.
+   *
+   * @param name Method name
+   * @param jitdump JitDump instance which should be written.
+   * @return MemorySegment of this builder
+   * @throws IllegalStateException when label(s) are not defined even if they are used
+   */
+  public MemorySegment getMemorySegment(String name, JitDump jitdump){
     updateTail();
+    storeMethodInfo(name, jitdump);
     return mem;
   }
 
diff --git a/src/test/java/com/yasuenag/ffmasm/test/common/CodeSegmentTest.java b/src/test/java/com/yasuenag/ffmasm/test/common/CodeSegmentTest.java
index 15b7d0c..708be27 100644
--- a/src/test/java/com/yasuenag/ffmasm/test/common/CodeSegmentTest.java
+++ b/src/test/java/com/yasuenag/ffmasm/test/common/CodeSegmentTest.java
@@ -39,7 +39,7 @@ public void testAlignment(){
 
   @Test
   public void testMethodInfoString(){
-    var info = new CodeSegment.MethodInfo(null, "func", 0x1234, 0xff);
+    var info = new CodeSegment.MethodInfo("func", 0x1234, 0xff);
     Assertions.assertEquals("0x1234 0xff func", info.toString());
   }
 
diff --git a/src/test/java/com/yasuenag/ffmasm/test/common/JitDumpTest.java b/src/test/java/com/yasuenag/ffmasm/test/common/JitDumpTest.java
index a5abd1c..7d26814 100644
--- a/src/test/java/com/yasuenag/ffmasm/test/common/JitDumpTest.java
+++ b/src/test/java/com/yasuenag/ffmasm/test/common/JitDumpTest.java
@@ -144,7 +144,7 @@ public void testJitDumpHeader(){
   @EnabledOnOs(OS.LINUX)
   public void testJitDumpFunctionEntry(){
     var dumpfile = getDumpFileInstance();
-    var info = new CodeSegment.MethodInfo(null, "func", 0x1234, 0);
+    var info = new CodeSegment.MethodInfo("func", 0x1234, 0);
 
     try(var jitdump = JitDump.getInstance(Path.of("/tmp"))){
       jitdump.writeFunction(info);