diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index 2376488..029ec75 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         java: [
-          22
+          23-ea
         ]
         os: [ ubuntu-latest, windows-latest ]
     runs-on: ${{ matrix.os }}
@@ -30,7 +30,6 @@ jobs:
         with:
           java-version: |
             ${{ matrix.java }}
-            21
           distribution: 'temurin'
       - name: Grant execute permission for gradlew
         if: ${{ runner.os != 'Windows' }}
@@ -40,16 +39,14 @@ jobs:
       - name: Execute Gradle build
         run: ./gradlew build
       - name: Upload build reports
-        if: ${{ runner.os == 'Linux' && matrix.java == '22' }}
         uses: actions/upload-artifact@v4
         with:
-          name: build-reports
+          name: build-reports-${{ runner.os }}-jdk${{ matrix.java }}
           path: |
             build/reports/
       - name: Capture build artifacts
-        if: ${{ runner.os == 'Linux' && matrix.java == '22' }}
         uses: actions/upload-artifact@v4
         with:
-          name: Artifacts
+          name: artifacts-${{ runner.os }}-jdk${{ matrix.java }}
           path: |
             build/libs/
diff --git a/README.md b/README.md
index 0cfd04a..c54a540 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Marshal allows you to conveniently create native library bindings with [FFM API]
 
 ~~See [wiki](https://github.com/Over-Run/marshal/wiki) for more information.~~
 
-This library requires JDK 22 or newer.
+This library requires JDK 23 or newer.
 
 ## Overview
 
@@ -95,7 +95,7 @@ Import as a Gradle dependency:
 
 ```groovy
 dependencies {
-    implementation("io.github.over-run:marshal:0.1.0-alpha.28-jdk22")
+    implementation("io.github.over-run:marshal:0.1.0-alpha.29-jdk23")
 }
 ```
 
diff --git a/gradle.properties b/gradle.properties
index 5e7118c..d8f0af0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -12,7 +12,7 @@ projGroupId=io.github.over-run
 projArtifactId=marshal
 # The project name should only contain lowercase letters, numbers and hyphen.
 projName=marshal
-projVersion=0.1.0-alpha.28-jdk22
+projVersion=0.1.0-alpha.29-jdk23
 projDesc=Marshaler of native libraries
 # Uncomment them if you want to publish to maven repository.
 projUrl=https://github.com/Over-Run/marshal
@@ -27,9 +27,9 @@ orgName=Overrun Organization
 orgUrl=https://over-run.github.io/
 
 # JDK Options
-jdkVersion=22
+jdkVersion=23
 jdkEnablePreview=true
 # javadoc link of JDK early access build
 # https://download.java.net/java/early_access/$jdkEarlyAccessDoc/docs/api/
 # Uncomment it if you need to use EA build of JDK.
-#jdkEarlyAccessDoc=jdk22
+jdkEarlyAccessDoc=jdk23
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 2c35211..a4b76b9 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 09523c0..9355b41 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/src/main/java/overrun/marshal/Downcall.java b/src/main/java/overrun/marshal/Downcall.java
index a366f19..ef20d40 100644
--- a/src/main/java/overrun/marshal/Downcall.java
+++ b/src/main/java/overrun/marshal/Downcall.java
@@ -161,7 +161,7 @@ private static void invokeSuperMethod(CodeBuilder codeBuilder, List<Parameter> p
         codeBuilder.aload(codeBuilder.receiverSlot());
         for (int i = 0, size = parameters.size(); i < size; i++) {
             final var parameter = parameters.get(i);
-            codeBuilder.loadInstruction(
+            codeBuilder.loadLocal(
                 TypeKind.fromDescriptor(parameter.getType().descriptorString())
                     .asLoadable(),
                 codeBuilder.parameterSlot(i));
@@ -394,7 +394,7 @@ private static <T> T loadBytecode(MethodHandles.Lookup caller, SymbolLookup look
                                 methodName,
                                 mtd_method,
                                 targetClass.isInterface()
-                            ).returnInstruction(returnTypeKind);
+                            ).return_(returnTypeKind);
                         } else {
                             //region body
                             final boolean hasAllocator =
@@ -520,7 +520,7 @@ private static <T> T loadBytecode(MethodHandles.Lookup caller, SymbolLookup look
                                     } else {
                                         final TypeKind typeKind = TypeKind.from(cd_returnTypeDowncall);
                                         resultSlot = blockCodeBuilder.allocateLocal(typeKind);
-                                        blockCodeBuilder.storeInstruction(typeKind, resultSlot);
+                                        blockCodeBuilder.storeLocal(typeKind, resultSlot);
                                     }
 
                                     // copy ref result
@@ -566,7 +566,7 @@ private static <T> T loadBytecode(MethodHandles.Lookup caller, SymbolLookup look
                                         } else {
                                             unmarshalSlot = -1;
                                         }
-                                        blockCodeBuilder.loadInstruction(TypeKind.from(cd_returnTypeDowncall), resultSlot);
+                                        blockCodeBuilder.loadLocal(TypeKind.from(cd_returnTypeDowncall), resultSlot);
                                     }
                                     final Convert convert = method.getDeclaredAnnotation(Convert.class);
                                     if (convert != null && returnType == boolean.class) {
@@ -612,18 +612,18 @@ private static <T> T loadBytecode(MethodHandles.Lookup caller, SymbolLookup look
                                     // reset stack
                                     if (shouldAddStack) {
                                         if (!returnVoid) {
-                                            blockCodeBuilder.storeInstruction(returnTypeKind, unmarshalSlot);
+                                            blockCodeBuilder.storeLocal(returnTypeKind, unmarshalSlot);
                                         }
                                         blockCodeBuilder.aload(stackSlot)
                                             .lload(stackPointerSlot)
                                             .invokevirtual(CD_MemoryStack, "setPointer", MTD_void_long);
                                         if (!returnVoid) {
-                                            blockCodeBuilder.loadInstruction(returnTypeKind, unmarshalSlot);
+                                            blockCodeBuilder.loadLocal(returnTypeKind, unmarshalSlot);
                                         }
                                     }
 
                                     // return
-                                    blockCodeBuilder.returnInstruction(returnTypeKind);
+                                    blockCodeBuilder.return_(returnTypeKind);
                                 },
                                 catchBuilder -> catchBuilder.catching(CD_Throwable, blockCodeBuilder -> {
                                     final int slot = blockCodeBuilder.allocateLocal(TypeKind.ReferenceType);
diff --git a/src/main/java/overrun/marshal/gen/processor/ArgumentProcessor.java b/src/main/java/overrun/marshal/gen/processor/ArgumentProcessor.java
index 8278a39..2197a4f 100644
--- a/src/main/java/overrun/marshal/gen/processor/ArgumentProcessor.java
+++ b/src/main/java/overrun/marshal/gen/processor/ArgumentProcessor.java
@@ -47,14 +47,14 @@ public boolean process(CodeBuilder builder, ProcessorType type, ArgumentProcesso
                 if (value == ProcessorType.Value.BOOLEAN &&
                     context.convert() != null) {
                     final Type convertType = context.convert().value();
-                    builder.loadInstruction(
+                    builder.loadLocal(
                         value.typeKind(),
                         context.parameterSlot()
                     ).invokestatic(CD_Marshal,
                         marshalFromBooleanMethod(convertType),
                         MethodTypeDesc.of(convertType.classDesc(), CD_boolean));
                 } else {
-                    builder.loadInstruction(
+                    builder.loadLocal(
                         value.typeKind().asLoadable(),
                         context.parameterSlot()
                     );
diff --git a/src/main/java/overrun/marshal/struct/StructAllocator.java b/src/main/java/overrun/marshal/struct/StructAllocator.java
index 14a60b6..0e1b31b 100644
--- a/src/main/java/overrun/marshal/struct/StructAllocator.java
+++ b/src/main/java/overrun/marshal/struct/StructAllocator.java
@@ -284,7 +284,7 @@ private static byte[] buildBytecode(MethodHandles.Lookup lookup, StructLayout la
                                         list.add(CD_long);
                                         list.addAll(getterParams);
                                     })))
-                                    .returnInstruction(returnKind);
+                                    .return_(returnKind);
                             });
 
                             // setter
@@ -302,7 +302,7 @@ private static byte[] buildBytecode(MethodHandles.Lookup lookup, StructLayout la
                                 for (int i = 0; i < indexCount; i++) {
                                     codeBuilder.lload(codeBuilder.parameterSlot(i));
                                 }
-                                codeBuilder.loadInstruction(returnKind, codeBuilder.parameterSlot(indexCount))
+                                codeBuilder.loadLocal(returnKind, codeBuilder.parameterSlot(indexCount))
                                     .invokevirtual(CD_VarHandle, "set", MethodTypeDesc.of(CD_void, makeClassDescriptors(list -> {
                                         list.add(CD_MemorySegment);
                                         list.add(CD_long);
@@ -329,7 +329,7 @@ private static byte[] buildBytecode(MethodHandles.Lookup lookup, StructLayout la
                             .getfield(cd_thisClass, "_segment", CD_MemorySegment)
                             .lconst_0()
                             .invokevirtual(CD_VarHandle, "get", MethodTypeDesc.of(returnDesc, CD_MemorySegment, CD_long))
-                            .returnInstruction(returnKind));
+                            .return_(returnKind));
 
                         // setter
                         classBuilder.withMethodBody(name, MethodTypeDesc.of(cd_caller, returnDesc), Modifier.PUBLIC, codeBuilder -> {
@@ -337,7 +337,7 @@ private static byte[] buildBytecode(MethodHandles.Lookup lookup, StructLayout la
                                 .aload(codeBuilder.receiverSlot())
                                 .getfield(cd_thisClass, "_segment", CD_MemorySegment)
                                 .lconst_0()
-                                .loadInstruction(returnKind, codeBuilder.parameterSlot(0))
+                                .loadLocal(returnKind, codeBuilder.parameterSlot(0))
                                 .invokevirtual(CD_VarHandle, "set", MethodTypeDesc.of(CD_void, CD_MemorySegment, CD_long, returnDesc));
                             codeBuilder.aload(codeBuilder.receiverSlot())
                                 .areturn();