--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotBackend.java	2019-03-09 03:56:16.244736068 +0100
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotBackend.java	2019-03-09 03:56:15.884733522 +0100
@@ -43,7 +43,7 @@
 import org.graalvm.compiler.core.common.CompilationIdentifier;
 import org.graalvm.compiler.core.common.LIRKind;
 import org.graalvm.compiler.core.common.alloc.RegisterAllocationConfig;
-import org.graalvm.compiler.core.target.Backend;
+import org.graalvm.compiler.core.gen.LIRGenerationProvider;
 import org.graalvm.compiler.debug.DebugContext;
 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
 import org.graalvm.compiler.hotspot.HotSpotDataBuilder;
@@ -85,21 +85,16 @@
 /**
  * HotSpot AMD64 specific backend.
  */
-public class AMD64HotSpotBackend extends HotSpotHostBackend {
+public class AMD64HotSpotBackend extends HotSpotHostBackend implements LIRGenerationProvider {
 
     public AMD64HotSpotBackend(GraalHotSpotVMConfig config, HotSpotGraalRuntimeProvider runtime, HotSpotProviders providers) {
         super(config, runtime, providers);
     }
 
-    @Override
-    public FrameMapBuilder newFrameMapBuilder(RegisterConfig registerConfig) {
+    private FrameMapBuilder newFrameMapBuilder(RegisterConfig registerConfig) {
         RegisterConfig registerConfigNonNull = registerConfig == null ? getCodeCache().getRegisterConfig() : registerConfig;
-        return new AMD64FrameMapBuilder(newFrameMap(registerConfigNonNull), getCodeCache(), registerConfigNonNull);
-    }
-
-    @Override
-    public FrameMap newFrameMap(RegisterConfig registerConfig) {
-        return new AMD64FrameMap(getCodeCache(), registerConfig, this);
+        FrameMap frameMap = new AMD64FrameMap(getCodeCache(), registerConfigNonNull, this);
+        return new AMD64FrameMapBuilder(frameMap, getCodeCache(), registerConfigNonNull);
     }
 
     @Override
@@ -108,8 +103,9 @@
     }
 
     @Override
-    public LIRGenerationResult newLIRGenerationResult(CompilationIdentifier compilationId, LIR lir, FrameMapBuilder frameMapBuilder, StructuredGraph graph, Object stub) {
-        return new HotSpotLIRGenerationResult(compilationId, lir, frameMapBuilder, makeCallingConvention(graph, (Stub) stub), stub, config.requiresReservedStackCheck(graph.getMethods()));
+    public LIRGenerationResult newLIRGenerationResult(CompilationIdentifier compilationId, LIR lir, RegisterConfig registerConfig, StructuredGraph graph, Object stub) {
+        return new HotSpotLIRGenerationResult(compilationId, lir, newFrameMapBuilder(registerConfig), makeCallingConvention(graph, (Stub) stub), stub,
+                        config.requiresReservedStackCheck(graph.getMethods()));
     }
 
     @Override
@@ -196,11 +192,6 @@
     }
 
     @Override
-    protected Assembler createAssembler(FrameMap frameMap) {
-        return new AMD64MacroAssembler(getTarget());
-    }
-
-    @Override
     public CompilationResultBuilder newCompilationResultBuilder(LIRGenerationResult lirGenRen, FrameMap frameMap, CompilationResult compilationResult, CompilationResultBuilderFactory factory) {
         // Omit the frame if the method:
         // - has no spill slots or other slots allocated during register allocation
@@ -216,7 +207,7 @@
         boolean omitFrame = CanOmitFrame.getValue(options) && !frameMap.frameNeedsAllocating() && !lir.hasArgInCallerFrame() && !gen.hasForeignCall();
 
         Stub stub = gen.getStub();
-        Assembler masm = createAssembler(frameMap);
+        Assembler masm = new AMD64MacroAssembler(getTarget());
         HotSpotFrameContext frameContext = new HotSpotFrameContext(stub != null, omitFrame);
         DataBuilder dataBuilder = new HotSpotDataBuilder(getCodeCache().getTarget());
         CompilationResultBuilder crb = factory.createBuilder(getCodeCache(), getForeignCalls(), frameMap, masm, dataBuilder, frameContext, options, debug, compilationResult, Register.None);
@@ -258,7 +249,7 @@
     /**
      * Emits the code prior to the verified entry point.
      *
-     * @param installedCodeOwner see {@link Backend#emitCode}
+     * @param installedCodeOwner see {@link LIRGenerationProvider#emitCode}
      */
     public void emitCodePrefix(ResolvedJavaMethod installedCodeOwner, CompilationResultBuilder crb, AMD64MacroAssembler asm, RegisterConfig regConfig, Label verifiedEntry) {
         HotSpotProviders providers = getProviders();
@@ -309,14 +300,14 @@
     /**
      * Emits the code which starts at the verified entry point.
      *
-     * @param installedCodeOwner see {@link Backend#emitCode}
+     * @param installedCodeOwner see {@link LIRGenerationProvider#emitCode}
      */
     public void emitCodeBody(ResolvedJavaMethod installedCodeOwner, CompilationResultBuilder crb, LIR lir) {
         crb.emit(lir);
     }
 
     /**
-     * @param installedCodeOwner see {@link Backend#emitCode}
+     * @param installedCodeOwner see {@link LIRGenerationProvider#emitCode}
      */
     public void emitCodeSuffix(ResolvedJavaMethod installedCodeOwner, CompilationResultBuilder crb, AMD64MacroAssembler asm, FrameMap frameMap) {
         HotSpotProviders providers = getProviders();