src/java.base/share/classes/jdk/internal/classfile/impl/DirectCodeBuilder.java

*** 38,10 ***
--- 38,11 ---
  import java.lang.constant.MethodTypeDesc;
  import java.util.*;
  import java.util.function.Consumer;
  import java.util.function.Function;
  
+ import static java.lang.constant.ConstantDescs.INIT_NAME;
  import static java.util.Objects.requireNonNull;
  import static jdk.internal.classfile.impl.BytecodeHelpers.*;
  import static jdk.internal.classfile.impl.RawBytecodeHelper.*;
  
  public final class DirectCodeBuilder

*** 363,11 ***
                              codeLength,
                              dcb.methodInfo.methodName().stringValue(),
                              dcb.methodInfo.methodTypeSymbol().displayDescriptor()));
                  }
  
!                 boolean codeMatch = dcb.original != null && codeAndExceptionsMatch(codeLength);
                  var context = dcb.context;
                  if (context.stackMapsWhenRequired()) {
                      if (codeMatch) {
                          dcb.attributes.withAttribute(dcb.original.findAttribute(Attributes.stackMapTable()).orElse(null));
                          writeCounters(true, buf);
--- 364,11 ---
                              codeLength,
                              dcb.methodInfo.methodName().stringValue(),
                              dcb.methodInfo.methodTypeSymbol().displayDescriptor()));
                  }
  
!                 boolean codeMatch = dcb.codeAndExceptionsMatch(codeLength, buf);
                  var context = dcb.context;
                  if (context.stackMapsWhenRequired()) {
                      if (codeMatch) {
                          dcb.attributes.withAttribute(dcb.original.findAttribute(Attributes.stackMapTable()).orElse(null));
                          writeCounters(true, buf);

*** 441,20 ***
          public Utf8Entry attributeName() {
              return buf.constantPool().utf8Entry(Attributes.NAME_LINE_NUMBER_TABLE);
          }
      }
  
!     private boolean codeAndExceptionsMatch(int codeLength) {
          boolean codeAttributesMatch;
          if (original instanceof CodeImpl cai && canWriteDirect(cai.constantPool())) {
              codeAttributesMatch = cai.codeLength == curPc()
                                    && cai.compareCodeBytes(bytecodesBufWriter, 0, codeLength);
              if (codeAttributesMatch) {
                  var bw = new BufWriterImpl(constantPool, context);
                  writeExceptionHandlers(bw);
                  codeAttributesMatch = cai.classReader.compare(bw, 0, cai.exceptionHandlerPos, bw.size());
              }
          }
          else
              codeAttributesMatch = false;
          return codeAttributesMatch;
      }
--- 442,36 ---
          public Utf8Entry attributeName() {
              return buf.constantPool().utf8Entry(Attributes.NAME_LINE_NUMBER_TABLE);
          }
      }
  
!     private boolean codeAndExceptionsMatch(int codeLength, BufWriterImpl buf) {
          boolean codeAttributesMatch;
          if (original instanceof CodeImpl cai && canWriteDirect(cai.constantPool())) {
              codeAttributesMatch = cai.codeLength == curPc()
                                    && cai.compareCodeBytes(bytecodesBufWriter, 0, codeLength);
              if (codeAttributesMatch) {
                  var bw = new BufWriterImpl(constantPool, context);
                  writeExceptionHandlers(bw);
                  codeAttributesMatch = cai.classReader.compare(bw, 0, cai.exceptionHandlerPos, bw.size());
              }
+ 
+             if (codeAttributesMatch) {
+                 var thisIsConstructor = methodInfo.methodName().equalsString(INIT_NAME);
+                 var originalIsConstructor = cai.enclosingMethod.methodName().equalsString(INIT_NAME);
+                 if (thisIsConstructor || originalIsConstructor) {
+                     if (thisIsConstructor != originalIsConstructor) {
+                         codeAttributesMatch = false;
+                     }
+                 }
+ 
+                 if (codeAttributesMatch && thisIsConstructor) {
+                     if (!buf.strictFieldsMatch(cai.classReader.getContainedClass())) {
+                         codeAttributesMatch = false;
+                     }
+                 }
+             }
          }
          else
              codeAttributesMatch = false;
          return codeAttributesMatch;
      }