Merge remote-tracking branch 'upstream/master'

build.gradle

@@ -1,9 +1,9 @@
-// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 apply plugin: 'java'
 
 compileJava {
-  sourceCompatibility '1.8'
-  targetCompatibility '1.8'
+  sourceCompatibility '11'
+  targetCompatibility '11'
 }
 
 sourceSets {
@@ -11,14 +11,14 @@ sourceSets {
   test.java.srcDirs 'test'
 }
 
-repositories { jcenter() }
+repositories { mavenCentral() }
 dependencies {
-  testCompile 'junit:junit:4.12'
-  testCompile 'org.assertj:assertj-core:3.12.2'
+  testImplementation 'junit:junit:4.12'
+  testImplementation 'org.assertj:assertj-core:3.12.2'
 }
 
 jar {
-  archiveName 'fernflower.jar'
+  archiveFileName = 'fernflower.jar'
   manifest {
     attributes 'Main-Class': 'org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler'
   }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Tue Nov 28 14:11:56 CET 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip

gradlew

@@ -1,5 +1,21 @@
 #!/usr/bin/env sh
 
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -28,7 +44,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
@@ -66,6 +82,7 @@ esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
+
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
@@ -109,10 +126,11 @@ if $darwin; then
     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
 
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin ; then
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
     JAVACMD=`cygpath --unix "$JAVACMD"`
 
     # We build the pattern for arguments to be converted via cygpath
@@ -138,19 +156,19 @@ if $cygwin ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
@@ -159,14 +177,9 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=$(save "$@")
+APP_ARGS=`save "$@"`
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
 exec "$JAVACMD" "$@"

gradlew.bat

@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -13,15 +29,18 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
+if "%ERRORLEVEL%" == "0" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -35,7 +54,7 @@ goto fail
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
-if exist "%JAVA_EXE%" goto init
+if exist "%JAVA_EXE%" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
@@ -45,28 +64,14 @@ echo location of your Java installation.
 
 goto fail
 
-:init
-@rem Get command-line arguments, handling Windows variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-
 :execute
 @rem Setup the command line
 
 set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
+
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
 
 :end
 @rem End local scope for the variables with windows NT shell

src/org/jetbrains/java/decompiler/code/CodeConstants.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.code;
 
 @SuppressWarnings({"unused", "SpellCheckingInspection"})
@@ -64,6 +64,7 @@ public interface CodeConstants {
   int ACC_STATIC = 0x0008;
   int ACC_FINAL = 0x0010;
   int ACC_SYNCHRONIZED = 0x0020;
+  int ACC_OPEN = 0x0020;
   int ACC_NATIVE = 0x0100;
   int ACC_ABSTRACT = 0x0400;
   int ACC_STRICT = 0x0800;
@@ -75,6 +76,7 @@ public interface CodeConstants {
   int ACC_ANNOTATION = 0x2000;
   int ACC_ENUM = 0x4000;
   int ACC_MANDATED = 0x8000;
+  int ACC_MODULE = 0x8000;
 
   // ----------------------------------------------------------------------
   // CLASS FLAGS
@@ -112,6 +114,8 @@ public interface CodeConstants {
   int CONSTANT_MethodHandle = 15;
   int CONSTANT_MethodType = 16;
   int CONSTANT_InvokeDynamic = 18;
+  int CONSTANT_Module = 19;
+  int CONSTANT_Package = 20;
 
   // ----------------------------------------------------------------------
   // MethodHandle reference_kind values

src/org/jetbrains/java/decompiler/code/cfg/ControlFlowGraph.java

@@ -1,10 +1,11 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.code.cfg;
 
 import org.jetbrains.java.decompiler.code.*;
 import org.jetbrains.java.decompiler.code.interpreter.InstructionImpact;
 import org.jetbrains.java.decompiler.main.DecompilerContext;
 import org.jetbrains.java.decompiler.modules.code.DeadCodeHelper;
+import org.jetbrains.java.decompiler.struct.StructClass;
 import org.jetbrains.java.decompiler.struct.StructMethod;
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
 import org.jetbrains.java.decompiler.struct.gen.DataPoint;
@@ -96,9 +97,9 @@ public class ControlFlowGraph implements CodeConstants {
     return buf.toString();
   }
 
-  public void inlineJsr(StructMethod mt) {
+  public void inlineJsr(StructClass cl, StructMethod mt) {
     processJsr();
-    removeJsr(mt);
+    removeJsr(cl, mt);
 
     removeMarkers();
 
@@ -432,7 +433,7 @@ public class ControlFlowGraph implements CodeConstants {
     }
   }
 
-  private static class JsrRecord {
+  private static final class JsrRecord {
     private final BasicBlock jsr;
     private final Set<BasicBlock> range;
     private final BasicBlock ret;
@@ -668,8 +669,8 @@ public class ControlFlowGraph implements CodeConstants {
     }
   }
 
-  private void removeJsr(StructMethod mt) {
-    removeJsrInstructions(mt.getClassStruct().getPool(), first, DataPoint.getInitialDataPoint(mt));
+  private void removeJsr(StructClass cl, StructMethod mt) {
+    removeJsrInstructions(cl.getPool(), first, DataPoint.getInitialDataPoint(mt));
   }
 
   private static void removeJsrInstructions(ConstantPool pool, BasicBlock block, DataPoint data) {

src/org/jetbrains/java/decompiler/code/cfg/ExceptionRangeCFG.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.code.cfg;
 
 import org.jetbrains.java.decompiler.main.DecompilerContext;
@@ -33,9 +33,16 @@ public class ExceptionRangeCFG {
     StringBuilder buf = new StringBuilder();
 
     buf.append("exceptionType:");
+
+    if (exceptionTypes == null) {
+      buf.append(" null");
+    }
+    else {
       for (String exception_type : exceptionTypes) {
         buf.append(" ").append(exception_type);
       }
+    }
+
     buf.append(new_line_separator);
 
     buf.append("handler: ").append(handler.id).append(new_line_separator);

src/org/jetbrains/java/decompiler/code/interpreter/InstructionImpact.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.code.interpreter;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -12,7 +12,7 @@ import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
 import org.jetbrains.java.decompiler.struct.gen.VarType;
 import org.jetbrains.java.decompiler.util.ListStack;
 
-public class InstructionImpact {
+public final class InstructionImpact {
 
   // {read, write}
   private static final int[][][] stack_impact = {

src/org/jetbrains/java/decompiler/main/AssertProcessor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -21,7 +21,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-public class AssertProcessor {
+public final class AssertProcessor {
 
   private static final VarType CLASS_ASSERTION_ERROR = new VarType(CodeConstants.TYPE_OBJECT, 0, "java/lang/AssertionError");
 

src/org/jetbrains/java/decompiler/main/ClassReference14Processor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -22,7 +22,7 @@ import org.jetbrains.java.decompiler.util.VBStyleCollection;
 import java.util.*;
 import java.util.Map.Entry;
 
-public class ClassReference14Processor {
+public final class ClassReference14Processor {
   private static final ExitExprent BODY_EXPR;
   private static final ExitExprent HANDLER_EXPR;
 

src/org/jetbrains/java/decompiler/main/ClassWriter.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -14,10 +14,7 @@ import org.jetbrains.java.decompiler.modules.decompiler.stats.RootStatement;
 import org.jetbrains.java.decompiler.modules.decompiler.vars.VarTypeProcessor;
 import org.jetbrains.java.decompiler.modules.decompiler.vars.VarVersionPair;
 import org.jetbrains.java.decompiler.modules.renamer.PoolInterceptor;
-import org.jetbrains.java.decompiler.struct.StructClass;
-import org.jetbrains.java.decompiler.struct.StructField;
-import org.jetbrains.java.decompiler.struct.StructMember;
-import org.jetbrains.java.decompiler.struct.StructMethod;
+import org.jetbrains.java.decompiler.struct.*;
 import org.jetbrains.java.decompiler.struct.attr.*;
 import org.jetbrains.java.decompiler.struct.consts.PrimitiveConstant;
 import org.jetbrains.java.decompiler.struct.gen.FieldDescriptor;
@@ -28,6 +25,7 @@ import org.jetbrains.java.decompiler.util.InterpreterUtil;
 import org.jetbrains.java.decompiler.util.TextBuffer;
 
 import java.util.*;
+import java.util.stream.Collectors;
 
 public class ClassWriter {
   private final PoolInterceptor interceptor;
@@ -43,7 +41,7 @@ public class ClassWriter {
     InitializerProcessor.extractInitializers(wrapper);
 
     if (node.type == ClassNode.CLASS_ROOT &&
-        !cl.isVersionGE_1_5() &&
+        !cl.isVersion5() &&
         DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_CLASS_1_4)) {
       ClassReference14Processor.processClassReferences(node);
     }
@@ -162,11 +160,19 @@ public class ClassWriter {
 
       dummy_tracer.incrementCurrentSourceLine(buffer.countLines(start_class_def));
 
+      List<StructRecordComponent> components = cl.getRecordComponents();
+
       for (StructField fd : cl.getFields()) {
         boolean hide = fd.isSynthetic() && DecompilerContext.getOption(IFernflowerPreferences.REMOVE_SYNTHETIC) ||
                        wrapper.getHiddenMembers().contains(InterpreterUtil.makeUniqueKey(fd.getName(), fd.getDescriptor()));
         if (hide) continue;
 
+        if (components != null && fd.getAccessFlags() == (CodeConstants.ACC_FINAL | CodeConstants.ACC_PRIVATE) &&
+            components.stream().anyMatch(c -> c.getName().equals(fd.getName()) && c.getDescriptor().equals(fd.getDescriptor()))) {
+          // Record component field: skip it
+          continue;
+        }
+
         boolean isEnum = fd.hasModifier(CodeConstants.ACC_ENUM) && DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM);
         if (isEnum) {
           if (enumFields) {
@@ -256,6 +262,117 @@ public class ClassWriter {
     DecompilerContext.getLogger().endWriteClass();
   }
 
+  @SuppressWarnings("SpellCheckingInspection")
+  private static boolean isSyntheticRecordMethod(StructClass cl, StructMethod mt, TextBuffer code) {
+    if (cl.getRecordComponents() != null) {
+      String name = mt.getName(), descriptor = mt.getDescriptor();
+      if (name.equals("equals") && descriptor.equals("(Ljava/lang/Object;)Z") ||
+          name.equals("hashCode") && descriptor.equals("()I") ||
+          name.equals("toString") && descriptor.equals("()Ljava/lang/String;")) {
+        if (code.countLines() == 1) {
+          String str = code.toString().trim();
+          return str.startsWith("return this." + name + "<invokedynamic>(this");
+        }
+      }
+    }
+    return false;
+  }
+
+  public static void packageInfoToJava(StructClass cl, TextBuffer buffer) {
+    appendAnnotations(buffer, 0, cl, -1);
+
+    int index = cl.qualifiedName.lastIndexOf('/');
+    String packageName = cl.qualifiedName.substring(0, index).replace('/', '.');
+    buffer.append("package ").append(packageName).append(';').appendLineSeparator().appendLineSeparator();
+  }
+
+  public static void moduleInfoToJava(StructClass cl, TextBuffer buffer) {
+    appendAnnotations(buffer, 0, cl, -1);
+
+    StructModuleAttribute moduleAttribute = cl.getAttribute(StructGeneralAttribute.ATTRIBUTE_MODULE);
+
+    if ((moduleAttribute.moduleFlags & CodeConstants.ACC_OPEN) != 0) {
+      buffer.append("open ");
+    }
+
+    buffer.append("module ").append(moduleAttribute.moduleName).append(" {").appendLineSeparator();
+
+    writeModuleInfoBody(buffer, moduleAttribute);
+
+    buffer.append('}').appendLineSeparator();
+  }
+
+  private static void writeModuleInfoBody(TextBuffer buffer, StructModuleAttribute moduleAttribute) {
+    boolean newLineNeeded = false;
+
+    List<StructModuleAttribute.RequiresEntry> requiresEntries = moduleAttribute.requires;
+    if (!requiresEntries.isEmpty()) {
+      for (StructModuleAttribute.RequiresEntry requires : requiresEntries) {
+        if (!isGenerated(requires.flags)) {
+          buffer.appendIndent(1).append("requires ").append(requires.moduleName.replace('/', '.')).append(';').appendLineSeparator();
+          newLineNeeded = true;
+        }
+      }
+    }
+
+    List<StructModuleAttribute.ExportsEntry> exportsEntries = moduleAttribute.exports;
+    if (!exportsEntries.isEmpty()) {
+      if (newLineNeeded) buffer.appendLineSeparator();
+      for (StructModuleAttribute.ExportsEntry exports : exportsEntries) {
+        if (!isGenerated(exports.flags)) {
+          buffer.appendIndent(1).append("exports ").append(exports.packageName.replace('/', '.'));
+          List<String> exportToModules = exports.exportToModules;
+          if (exportToModules.size() > 0) {
+            buffer.append(" to").appendLineSeparator();
+            appendFQClassNames(buffer, exportToModules);
+          }
+          buffer.append(';').appendLineSeparator();
+          newLineNeeded = true;
+        }
+      }
+    }
+
+    List<StructModuleAttribute.OpensEntry> opensEntries = moduleAttribute.opens;
+    if (!opensEntries.isEmpty()) {
+      if (newLineNeeded) buffer.appendLineSeparator();
+      for (StructModuleAttribute.OpensEntry opens : opensEntries) {
+        if (!isGenerated(opens.flags)) {
+          buffer.appendIndent(1).append("opens ").append(opens.packageName.replace('/', '.'));
+          List<String> opensToModules = opens.opensToModules;
+          if (opensToModules.size() > 0) {
+            buffer.append(" to").appendLineSeparator();
+            appendFQClassNames(buffer, opensToModules);
+          }
+          buffer.append(';').appendLineSeparator();
+          newLineNeeded = true;
+        }
+      }
+    }
+
+    List<String> usesEntries = moduleAttribute.uses;
+    if (!usesEntries.isEmpty()) {
+      if (newLineNeeded) buffer.appendLineSeparator();
+      for (String uses : usesEntries) {
+        buffer.appendIndent(1).append("uses ").append(ExprProcessor.buildJavaClassName(uses)).append(';').appendLineSeparator();
+      }
+      newLineNeeded = true;
+    }
+
+    List<StructModuleAttribute.ProvidesEntry> providesEntries = moduleAttribute.provides;
+    if (!providesEntries.isEmpty()) {
+      if (newLineNeeded) buffer.appendLineSeparator();
+      for (StructModuleAttribute.ProvidesEntry provides : providesEntries) {
+        buffer.appendIndent(1).append("provides ").append(ExprProcessor.buildJavaClassName(provides.interfaceName)).append(" with").appendLineSeparator();
+        appendFQClassNames(buffer, provides.implementationNames.stream().map(ExprProcessor::buildJavaClassName).collect(Collectors.toList()));
+        buffer.append(';').appendLineSeparator();
+      }
+    }
+  }
+
+  private static boolean isGenerated(int flags) {
+    return (flags & (CodeConstants.ACC_SYNTHETIC | CodeConstants.ACC_MANDATED)) != 0;
+  }
+
   private static void addTracer(StructClass cls, StructMethod method, BytecodeMappingTracer tracer) {
     StructLineNumberTableAttribute table = method.getAttribute(StructGeneralAttribute.ATTRIBUTE_LINE_NUMBER_TABLE);
     tracer.setLineNumberTable(table);
@@ -302,6 +419,13 @@ public class ClassWriter {
       flags &= ~CodeConstants.ACC_FINAL;
     }
 
+    List<StructRecordComponent> components = cl.getRecordComponents();
+
+    if (components != null) {
+      // records are implicitly final
+      flags &= ~CodeConstants.ACC_FINAL;
+    }
+
     appendModifiers(buffer, flags, CLASS_ALLOWED, isInterface, CLASS_EXCLUDED);
 
     if (isEnum) {
@@ -313,10 +437,12 @@ public class ClassWriter {
       }
       buffer.append("interface ");
     }
+    else if (components != null) {
+      buffer.append("record ");
+    }
     else {
       buffer.append("class ");
     }
-
     buffer.append(node.simpleName);
 
     GenericClassDescriptor descriptor = getGenericClassDescriptor(cl);
@@ -324,9 +450,22 @@ public class ClassWriter {
       appendTypeParameters(buffer, descriptor.fparameters, descriptor.fbounds);
     }
 
+    if (components != null) {
+      buffer.append('(');
+      for (int i = 0; i < components.size(); i++) {
+        StructRecordComponent cd = components.get(i);
+        if (i > 0) {
+          buffer.append(", ");
+        }
+        boolean varArgComponent = i == components.size() - 1 && isVarArgRecord(cl);
+        recordComponentToJava(cd, buffer, varArgComponent);
+      }
+      buffer.append(')');
+    }
+
     buffer.append(' ');
 
-    if (!isEnum && !isInterface && cl.superClass != null) {
+    if (!isEnum && !isInterface && components == null && cl.superClass != null) {
       VarType supertype = new VarType(cl.superClass.getString(), true);
       if (!VarType.VARTYPE_OBJECT.equals(supertype)) {
         buffer.append("extends ");
@@ -362,6 +501,13 @@ public class ClassWriter {
     buffer.append('{').appendLineSeparator();
   }
 
+  private static boolean isVarArgRecord(StructClass cl) {
+    String canonicalConstructorDescriptor =
+      cl.getRecordComponents().stream().map(c -> c.getDescriptor()).collect(Collectors.joining("", "(", ")V"));
+    StructMethod init = cl.getMethod(CodeConstants.INIT_NAME, canonicalConstructorDescriptor);
+    return init != null && init.hasModifier(CodeConstants.ACC_VARARGS);
+  }
+
   private void fieldToJava(ClassWrapper wrapper, StructClass cl, StructField fd, TextBuffer buffer, int indent, BytecodeMappingTracer tracer) {
     int start = buffer.length();
     boolean isInterface = cl.hasModifier(CodeConstants.ACC_INTERFACE);
@@ -389,15 +535,9 @@ public class ClassWriter {
       appendModifiers(buffer, fd.getAccessFlags(), FIELD_ALLOWED, isInterface, FIELD_EXCLUDED);
     }
 
-    VarType fieldType = new VarType(fd.getDescriptor(), false);
-
-    GenericFieldDescriptor descriptor = null;
-    if (DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES)) {
-      StructGenericSignatureAttribute attr = fd.getAttribute(StructGeneralAttribute.ATTRIBUTE_SIGNATURE);
-      if (attr != null) {
-        descriptor = GenericMain.parseFieldSignature(attr.getSignature());
-      }
-    }
+    Map.Entry<VarType, GenericFieldDescriptor> fieldTypeData = getFieldTypeData(fd);
+    VarType fieldType = fieldTypeData.getKey();
+    GenericFieldDescriptor descriptor = fieldTypeData.getValue();
 
     if (!isEnum) {
       if (descriptor != null) {
@@ -452,6 +592,27 @@ public class ClassWriter {
     }
   }
 
+  private static void recordComponentToJava(StructRecordComponent cd, TextBuffer buffer, boolean varArgComponent) {
+    appendAnnotations(buffer, -1, cd, TypeAnnotation.FIELD);
+
+    Map.Entry<VarType, GenericFieldDescriptor> fieldTypeData = getFieldTypeData(cd);
+    VarType fieldType = fieldTypeData.getKey();
+    GenericFieldDescriptor descriptor = fieldTypeData.getValue();
+
+    if (descriptor != null) {
+      buffer.append(GenericMain.getGenericCastTypeName(varArgComponent ? descriptor.type.decreaseArrayDim() : descriptor.type));
+    }
+    else {
+      buffer.append(ExprProcessor.getCastTypeName(varArgComponent ? fieldType.decreaseArrayDim() : fieldType));
+    }
+    if (varArgComponent) {
+      buffer.append("...");
+    }
+    buffer.append(' ');
+
+    buffer.append(cd.getName());
+  }
+
   private static void methodLambdaToJava(ClassNode lambdaNode,
                                          ClassWrapper classWrapper,
                                          StructMethod mt,
@@ -579,7 +740,7 @@ public class ClassWriter {
       boolean isAnnotation = cl.hasModifier(CodeConstants.ACC_ANNOTATION);
       boolean isEnum = cl.hasModifier(CodeConstants.ACC_ENUM) && DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM);
       boolean isDeprecated = mt.hasAttribute(StructGeneralAttribute.ATTRIBUTE_DEPRECATED);
-      boolean clinit = false, init = false, dinit = false;
+      boolean clInit = false, init = false, dInit = false;
 
       MethodDescriptor md = MethodDescriptor.parseDescriptor(mt.getDescriptor());
 
@@ -624,7 +785,7 @@ public class ClassWriter {
       if (CodeConstants.INIT_NAME.equals(name)) {
         if (node.type == ClassNode.CLASS_ANONYMOUS) {
           name = "";
-          dinit = true;
+          dInit = true;
         }
         else {
           name = node.simpleName;
@@ -633,7 +794,7 @@ public class ClassWriter {
       }
       else if (CodeConstants.CLINIT_NAME.equals(name)) {
         name = "";
-        clinit = true;
+        clInit = true;
       }
 
       GenericMethodDescriptor descriptor = null;
@@ -662,7 +823,7 @@ public class ClassWriter {
       boolean throwsExceptions = false;
       int paramCount = 0;
 
-      if (!clinit && !dinit) {
+      if (!clInit && !dInit) {
         boolean thisVar = !mt.hasModifier(CodeConstants.ACC_STATIC);
 
         if (descriptor != null && !descriptor.typeParameters.isEmpty()) {
@@ -795,7 +956,7 @@ public class ClassWriter {
         buffer.appendLineSeparator();
       }
       else {
-        if (!clinit && !dinit) {
+        if (!clInit && !dInit) {
           buffer.append(' ');
         }
 
@@ -811,7 +972,8 @@ public class ClassWriter {
             BytecodeMappingTracer codeTracer = new BytecodeMappingTracer(tracer.getCurrentSourceLine());
             TextBuffer code = root.toJava(indent + 1, codeTracer);
 
-            hideMethod = (code.length() == 0) && (clinit || dinit || hideConstructor(node, init, throwsExceptions, paramCount, flags));
+            hideMethod = code.length() == 0 && (clInit || dInit || hideConstructor(node, init, throwsExceptions, paramCount, flags)) ||
+                         isSyntheticRecordMethod(cl, mt, code);
 
             buffer.append(code);
 
@@ -851,7 +1013,6 @@ public class ClassWriter {
   }
 
   private static boolean hideConstructor(ClassNode node, boolean init, boolean throwsExceptions, int paramCount, int methodAccessFlags) {
-
     if (!init || throwsExceptions || paramCount > 0 || !DecompilerContext.getOption(IFernflowerPreferences.HIDE_DEFAULT_CONSTRUCTOR)) {
       return false;
     }
@@ -859,11 +1020,11 @@ public class ClassWriter {
     ClassWrapper wrapper = node.getWrapper();
 	  StructClass cl = wrapper.getClassStruct();
 
-	  int classAccesFlags = node.type == ClassNode.CLASS_ROOT ? cl.getAccessFlags() : node.access;
+	  int classAccessFlags = node.type == ClassNode.CLASS_ROOT ? cl.getAccessFlags() : node.access;
     boolean isEnum = cl.hasModifier(CodeConstants.ACC_ENUM) && DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM);
 
     // default constructor requires same accessibility flags. Exception: enum constructor which is always private
-  	if(!isEnum && ((classAccesFlags & ACCESSIBILITY_FLAGS) != (methodAccessFlags & ACCESSIBILITY_FLAGS))) {
+  	if(!isEnum && ((classAccessFlags & ACCESSIBILITY_FLAGS) != (methodAccessFlags & ACCESSIBILITY_FLAGS))) {
   	  return false;
   	}
 
@@ -879,6 +1040,20 @@ public class ClassWriter {
     return true;
   }
 
+  private static Map.Entry<VarType, GenericFieldDescriptor> getFieldTypeData(StructField fd) {
+    VarType fieldType = new VarType(fd.getDescriptor(), false);
+
+    GenericFieldDescriptor descriptor = null;
+    if (DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES)) {
+      StructGenericSignatureAttribute attr = fd.getAttribute(StructGeneralAttribute.ATTRIBUTE_SIGNATURE);
+      if (attr != null) {
+        descriptor = GenericMain.parseFieldSignature(attr.getSignature());
+      }
+    }
+
+    return new AbstractMap.SimpleImmutableEntry<>(fieldType, descriptor);
+  }
+
   private static void appendDeprecation(TextBuffer buffer, int indent) {
     buffer.appendIndent(indent).append("/** @deprecated */").appendLineSeparator();
   }
@@ -937,11 +1112,11 @@ public class ClassWriter {
     buffer.appendIndent(indent).append("// $FF: ").append(comment).appendLineSeparator();
   }
 
-  private static final StructGeneralAttribute.Key[] ANNOTATION_ATTRIBUTES = {
+  private static final StructGeneralAttribute.Key<?>[] ANNOTATION_ATTRIBUTES = {
     StructGeneralAttribute.ATTRIBUTE_RUNTIME_VISIBLE_ANNOTATIONS, StructGeneralAttribute.ATTRIBUTE_RUNTIME_INVISIBLE_ANNOTATIONS};
-  private static final StructGeneralAttribute.Key[] PARAMETER_ANNOTATION_ATTRIBUTES = {
+  private static final StructGeneralAttribute.Key<?>[] PARAMETER_ANNOTATION_ATTRIBUTES = {
     StructGeneralAttribute.ATTRIBUTE_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS, StructGeneralAttribute.ATTRIBUTE_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS};
-  private static final StructGeneralAttribute.Key[] TYPE_ANNOTATION_ATTRIBUTES = {
+  private static final StructGeneralAttribute.Key<?>[] TYPE_ANNOTATION_ATTRIBUTES = {
     StructGeneralAttribute.ATTRIBUTE_RUNTIME_VISIBLE_TYPE_ANNOTATIONS, StructGeneralAttribute.ATTRIBUTE_RUNTIME_INVISIBLE_TYPE_ANNOTATIONS};
 
   private static void appendAnnotations(TextBuffer buffer, int indent, StructMember mb, int targetType) {
@@ -953,7 +1128,13 @@ public class ClassWriter {
         for (AnnotationExprent annotation : attribute.getAnnotations()) {
           String text = annotation.toJava(indent, BytecodeMappingTracer.DUMMY).toString();
           filter.add(text);
-          buffer.append(text).appendLineSeparator();
+          buffer.append(text);
+          if (indent < 0) {
+            buffer.append(' ');
+          }
+          else {
+            buffer.appendLineSeparator();
+          }
         }
       }
     }
@@ -1079,4 +1260,14 @@ public class ClassWriter {
 
     buffer.append('>');
   }
+
+  private static void appendFQClassNames(TextBuffer buffer, List<String> names) {
+    for (int i = 0; i < names.size(); i++) {
+      String name = names.get(i);
+      buffer.appendIndent(2).append(name);
+      if (i < names.size() - 1) {
+        buffer.append(',').appendLineSeparator();
+      }
+    }
+  }
 }

src/org/jetbrains/java/decompiler/main/ClassesProcessor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -245,7 +245,7 @@ public class ClassesProcessor implements CodeConstants {
       }
 
       try {
-        mt.expandData();
+        mt.expandData(enclosingCl);
 
         InstructionSequence seq = mt.getInstructionSequence();
         if (seq != null) {
@@ -302,15 +302,32 @@ public class ClassesProcessor implements CodeConstants {
       return;
     }
 
+    boolean packageInfo = cl.isSynthetic() && "package-info".equals(root.simpleName);
+    boolean moduleInfo = cl.hasModifier(CodeConstants.ACC_MODULE) && cl.hasAttribute(StructGeneralAttribute.ATTRIBUTE_MODULE);
+
     DecompilerContext.getLogger().startReadingClass(cl.qualifiedName);
     try {
       ImportCollector importCollector = new ImportCollector(root);
       DecompilerContext.startClass(importCollector);
 
+      if (packageInfo) {
+        ClassWriter.packageInfoToJava(cl, buffer);
+
+        importCollector.writeImports(buffer, false);
+      }
+      else if (moduleInfo) {
+        TextBuffer moduleBuffer = new TextBuffer(AVERAGE_CLASS_SIZE);
+        ClassWriter.moduleInfoToJava(cl, moduleBuffer);
+
+        importCollector.writeImports(buffer, true);
+
+        buffer.append(moduleBuffer);
+      }
+      else {
         new LambdaProcessor().processClass(root);
 
         // add simple class names to implicit import
-      addClassnameToImport(root, importCollector);
+        addClassNameToImport(root, importCollector);
 
         // build wrappers for all nested classes (that's where actual processing takes place)
         initWrappers(root);
@@ -322,21 +339,13 @@ public class ClassesProcessor implements CodeConstants {
         TextBuffer classBuffer = new TextBuffer(AVERAGE_CLASS_SIZE);
         new ClassWriter().classToJava(root, classBuffer, 0, null);
 
-      int index = cl.qualifiedName.lastIndexOf("/");
+        int index = cl.qualifiedName.lastIndexOf('/');
         if (index >= 0) {
           String packageName = cl.qualifiedName.substring(0, index).replace('/', '.');
-
-        buffer.append("package ");
-        buffer.append(packageName);
-        buffer.append(";");
-        buffer.appendLineSeparator();
-        buffer.appendLineSeparator();
+          buffer.append("package ").append(packageName).append(';').appendLineSeparator().appendLineSeparator();
         }
 
-      int import_lines_written = importCollector.writeImports(buffer);
-      if (import_lines_written > 0) {
-        buffer.appendLineSeparator();
-      }
+        importCollector.writeImports(buffer, true);
 
         int offsetLines = buffer.countLines();
 
@@ -354,6 +363,7 @@ public class ClassesProcessor implements CodeConstants {
           }
         }
       }
+    }
     finally {
       destroyWrappers(root);
       DecompilerContext.getLogger().endReadingClass();
@@ -375,13 +385,13 @@ public class ClassesProcessor implements CodeConstants {
     }
   }
 
-  private static void addClassnameToImport(ClassNode node, ImportCollector imp) {
+  private static void addClassNameToImport(ClassNode node, ImportCollector imp) {
     if (node.simpleName != null && node.simpleName.length() > 0) {
       imp.getShortName(node.type == ClassNode.CLASS_ROOT ? node.classStruct.qualifiedName : node.simpleName, false);
     }
 
     for (ClassNode nd : node.nested) {
-      addClassnameToImport(nd, imp);
+      addClassNameToImport(nd, imp);
     }
   }
 

src/org/jetbrains/java/decompiler/main/EnumProcessor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -13,7 +13,7 @@ import org.jetbrains.java.decompiler.struct.StructField;
 import org.jetbrains.java.decompiler.struct.StructMethod;
 import org.jetbrains.java.decompiler.util.InterpreterUtil;
 
-public class EnumProcessor {
+public final class EnumProcessor {
   public static void clearEnum(ClassWrapper wrapper) {
     StructClass cl = wrapper.getClassStruct();
 

src/org/jetbrains/java/decompiler/main/InitializerProcessor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -18,7 +18,7 @@ import org.jetbrains.java.decompiler.util.InterpreterUtil;
 import java.util.ArrayList;
 import java.util.List;
 
-public class InitializerProcessor {
+public final class InitializerProcessor {
   public static void extractInitializers(ClassWrapper wrapper) {
     MethodWrapper method = wrapper.getMethodWrapper(CodeConstants.CLINIT_NAME, "()V");
     if (method != null && method.root != null) {  // successfully decompiled static constructor

src/org/jetbrains/java/decompiler/main/collectors/ImportCollector.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main.collectors;
 
 import org.jetbrains.java.decompiler.main.ClassesProcessor.ClassNode;
@@ -39,8 +39,10 @@ public class ImportCollector {
 
     Map<String, StructClass> classes = DecompilerContext.getStructContext().getClasses();
     LinkedList<String> queue = new LinkedList<>();
+    Set<StructClass> processedClasses = new HashSet<>();
     StructClass currentClass = root.classStruct;
     while (currentClass != null) {
+      processedClasses.add(currentClass);
       if (currentClass.superClass != null) {
         queue.add(currentClass.superClass.getString());
       }
@@ -63,10 +65,17 @@ public class ImportCollector {
       }
 
       // .. and traverse through parent.
-      currentClass = !queue.isEmpty() ? classes.get(queue.removeFirst()) : null;
-      while (currentClass == null && !queue.isEmpty()) {
-        currentClass = classes.get(queue.removeFirst());
+      do {
+        currentClass = queue.isEmpty() ? null : classes.get(queue.removeFirst());
+
+        if (currentClass != null && processedClasses.contains(currentClass)) {
+          // Class already processed, skipping.
+
+          // This may be sign of circularity in the class hierarchy but in most cases this mean that same interface
+          // are listed as implemented several times in the class hierarchy.
+          currentClass = null;
         }
+      } while (currentClass == null && !queue.isEmpty());
     }
   }
 
@@ -150,21 +159,14 @@ public class ImportCollector {
     return result == null ? shortName : result;
   }
 
-  public int writeImports(TextBuffer buffer) {
-    int importLinesWritten = 0;
-
+  public void writeImports(TextBuffer buffer, boolean addSeparator) {
     List<String> imports = packImports();
-
-    for (String s : imports) {
-      buffer.append("import ");
-      buffer.append(s);
-      buffer.append(';');
+    for (String line : imports) {
+      buffer.append("import ").append(line).append(';').appendLineSeparator();
+    }
+    if (addSeparator && !imports.isEmpty()) {
       buffer.appendLineSeparator();
-
-      importLinesWritten++;
     }
-
-    return importLinesWritten;
   }
 
   private List<String> packImports() {

src/org/jetbrains/java/decompiler/main/decompiler/BaseDecompiler.java

@@ -25,17 +25,6 @@ public class BaseDecompiler {
     engine.addLibrary(library);
   }
 
-  /** @deprecated use {@link #addSource(File)} / {@link #addLibrary(File)} instead */
-  @Deprecated
-  public void addSpace(File file, boolean own) {
-    if (own) {
-      addSource(file);
-    }
-    else {
-      addLibrary(file);
-    }
-  }
-
   public void decompileContext() {
     try {
       engine.decompileContext();

src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main.rels;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -60,10 +60,10 @@ public class ClassWrapper {
       try {
         if (mt.containsCode()) {
           if (maxSec == 0 || testMode) {
-            root = MethodProcessorRunnable.codeToJava(mt, md, varProc);
+            root = MethodProcessorRunnable.codeToJava(classStruct, mt, md, varProc);
           }
           else {
-            MethodProcessorRunnable mtProc = new MethodProcessorRunnable(mt, md, varProc, DecompilerContext.getCurrentContext());
+            MethodProcessorRunnable mtProc = new MethodProcessorRunnable(classStruct, mt, md, varProc, DecompilerContext.getCurrentContext());
 
             Thread mtThread = new Thread(mtProc, "Java decompiler");
             long stopAt = System.currentTimeMillis() + maxSec * 1000L;

src/org/jetbrains/java/decompiler/main/rels/LambdaProcessor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main.rels;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -33,17 +33,16 @@ public class LambdaProcessor {
     ClassesProcessor clProcessor = DecompilerContext.getClassProcessor();
     StructClass cl = node.classStruct;
 
-    if (cl.getBytecodeVersion() < CodeConstants.BYTECODE_JAVA_8) { // lambda beginning with Java 8
+    if (!cl.isVersion8()) { // lambda beginning with Java 8
       return;
     }
 
-    StructBootstrapMethodsAttribute bootstrap =
-      cl.getAttribute(StructGeneralAttribute.ATTRIBUTE_BOOTSTRAP_METHODS);
+    StructBootstrapMethodsAttribute bootstrap = cl.getAttribute(StructGeneralAttribute.ATTRIBUTE_BOOTSTRAP_METHODS);
     if (bootstrap == null || bootstrap.getMethodsNumber() == 0) {
       return; // no bootstrap constants in pool
     }
 
-    BitSet lambda_methods = new BitSet();
+    BitSet lambdaMethods = new BitSet();
 
     // find lambda bootstrap constants
     for (int i = 0; i < bootstrap.getMethodsNumber(); ++i) {
@@ -52,11 +51,11 @@ public class LambdaProcessor {
       // FIXME: extend for Eclipse etc. at some point
       if (JAVAC_LAMBDA_CLASS.equals(method_ref.classname) &&
           (JAVAC_LAMBDA_METHOD.equals(method_ref.elementname) || JAVAC_LAMBDA_ALT_METHOD.equals(method_ref.elementname))) {
-        lambda_methods.set(i);
+        lambdaMethods.set(i);
       }
     }
 
-    if (lambda_methods.isEmpty()) {
+    if (lambdaMethods.isEmpty()) {
       return; // no lambda bootstrap constant found
     }
 
@@ -64,7 +63,7 @@ public class LambdaProcessor {
 
     // iterate over code and find invocations of bootstrap methods. Replace them with anonymous classes.
     for (StructMethod mt : cl.getMethods()) {
-      mt.expandData();
+      mt.expandData(cl);
 
       InstructionSequence seq = mt.getInstructionSequence();
       if (seq != null && seq.length() > 0) {
@@ -76,7 +75,7 @@ public class LambdaProcessor {
           if (instr.opcode == CodeConstants.opc_invokedynamic) {
             LinkConstant invoke_dynamic = cl.getPool().getLinkConstant(instr.operand(0));
 
-            if (lambda_methods.get(invoke_dynamic.index1)) { // lambda invocation found
+            if (lambdaMethods.get(invoke_dynamic.index1)) { // lambda invocation found
 
               List<PooledConstant> bootstrap_arguments = bootstrap.getMethodArguments(invoke_dynamic.index1);
               MethodDescriptor md = MethodDescriptor.parseDescriptor(invoke_dynamic.descriptor);

src/org/jetbrains/java/decompiler/main/rels/MethodProcessorRunnable.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.main.rels;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -22,6 +22,7 @@ import java.io.IOException;
 public class MethodProcessorRunnable implements Runnable {
   public final Object lock = new Object();
 
+  private final StructClass klass;
   private final StructMethod method;
   private final MethodDescriptor methodDescriptor;
   private final VarProcessor varProc;
@@ -31,10 +32,12 @@ public class MethodProcessorRunnable implements Runnable {
   private volatile Throwable error;
   private volatile boolean finished = false;
 
-  public MethodProcessorRunnable(StructMethod method,
+  public MethodProcessorRunnable(StructClass klass,
+                                 StructMethod method,
                                  MethodDescriptor methodDescriptor,
                                  VarProcessor varProc,
                                  DecompilerContext parentContext) {
+    this.klass = klass;
     this.method = method;
     this.methodDescriptor = methodDescriptor;
     this.varProc = varProc;
@@ -48,7 +51,7 @@ public class MethodProcessorRunnable implements Runnable {
 
     try {
       DecompilerContext.setCurrentContext(parentContext);
-      root = codeToJava(method, methodDescriptor, varProc);
+      root = codeToJava(klass, method, methodDescriptor, varProc);
     }
     catch (Throwable t) {
       error = t;
@@ -63,17 +66,15 @@ public class MethodProcessorRunnable implements Runnable {
     }
   }
 
-  public static RootStatement codeToJava(StructMethod mt, MethodDescriptor md, VarProcessor varProc) throws IOException {
-    StructClass cl = mt.getClassStruct();
-
+  public static RootStatement codeToJava(StructClass cl, StructMethod mt, MethodDescriptor md, VarProcessor varProc) throws IOException {
     boolean isInitializer = CodeConstants.CLINIT_NAME.equals(mt.getName()); // for now static initializer only
 
-    mt.expandData();
+    mt.expandData(cl);
     InstructionSequence seq = mt.getInstructionSequence();
     ControlFlowGraph graph = new ControlFlowGraph(seq);
 
     DeadCodeHelper.removeDeadBlocks(graph);
-    graph.inlineJsr(mt);
+    graph.inlineJsr(cl, mt);
 
     // TODO: move to the start, before jsr inlining
     DeadCodeHelper.connectDummyExitBlock(graph);
@@ -110,13 +111,13 @@ public class MethodProcessorRunnable implements Runnable {
       if (!ExceptionDeobfuscator.handleMultipleEntryExceptionRanges(graph)) {
         DecompilerContext.getLogger().writeMessage("Found multiple entry exception ranges which could not be splitted", IFernflowerLogger.Severity.WARN);
       }
-      ExceptionDeobfuscator.insertDummyExceptionHandlerBlocks(graph, cl.getBytecodeVersion());
+      ExceptionDeobfuscator.insertDummyExceptionHandlerBlocks(graph, mt.getBytecodeVersion());
     }
 
     RootStatement root = DomHelper.parseGraph(graph);
 
     FinallyProcessor fProc = new FinallyProcessor(md, varProc);
-    while (fProc.iterateGraph(mt, root, graph)) {
+    while (fProc.iterateGraph(cl, mt, root, graph)) {
       root = DomHelper.parseGraph(graph);
     }
 

src/org/jetbrains/java/decompiler/modules/code/DeadCodeHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.code;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -13,7 +13,7 @@ import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
 
 import java.util.*;
 
-public class DeadCodeHelper {
+public final class DeadCodeHelper {
 
   public static void removeDeadBlocks(ControlFlowGraph graph) {
 
@@ -267,7 +267,9 @@ public class DeadCodeHelper {
         for (BasicBlock block : range.getProtectedRange()) {
           setPreds.addAll(block.getPreds());
         }
-        setPreds.removeAll(range.getProtectedRange());
+        for (BasicBlock basicBlock : range.getProtectedRange()) {
+          setPreds.remove(basicBlock);
+        }
 
         if(setPreds.size() != 1) {
           continue; // multiple predecessors, obfuscated range
@@ -280,8 +282,7 @@ public class DeadCodeHelper {
         }
 
         boolean monitorexit_in_range = false;
-        Set<BasicBlock> setProtectedBlocks = new HashSet<>();
-        setProtectedBlocks.addAll(range.getProtectedRange());
+        Set<BasicBlock> setProtectedBlocks = new HashSet<>(range.getProtectedRange());
         setProtectedBlocks.add(range.getHandler());
 
         for (BasicBlock block : setProtectedBlocks) {
@@ -305,7 +306,9 @@ public class DeadCodeHelper {
         for (BasicBlock block : range.getProtectedRange()) {
           setSuccs.addAll(block.getSuccs());
         }
-        setSuccs.removeAll(range.getProtectedRange());
+        for (BasicBlock basicBlock : range.getProtectedRange()) {
+          setSuccs.remove(basicBlock);
+        }
 
         if(setSuccs.size() != 1) {
           continue; // non-unique successor
@@ -461,7 +464,9 @@ public class DeadCodeHelper {
             }
 
             // add exception ranges from predecessors
-            setPredHandlersIntersection.removeAll(block.getSuccExceptions());
+            for (BasicBlock basicBlock : block.getSuccExceptions()) {
+              setPredHandlersIntersection.remove(basicBlock);
+            }
             BasicBlock predecessor = block.getPreds().get(0);
 
             for (BasicBlock handler : setPredHandlersIntersection) {

src/org/jetbrains/java/decompiler/modules/decompiler/ClasspathHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
@@ -9,7 +9,7 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
-public class ClasspathHelper {
+public final class ClasspathHelper {
 
   private static final Map<String, Method> METHOD_CACHE = Collections.synchronizedMap(new HashMap<>());
 

src/org/jetbrains/java/decompiler/modules/decompiler/ClearStructHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.modules.decompiler.stats.RootStatement;
@@ -7,7 +7,7 @@ import org.jetbrains.java.decompiler.modules.decompiler.stats.Statement;
 import java.util.LinkedList;
 
 
-public class ClearStructHelper {
+public final class ClearStructHelper {
 
   public static void clearStatements(RootStatement root) {
 

src/org/jetbrains/java/decompiler/modules/decompiler/ConcatenationHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -13,7 +13,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Set;
 
-public class ConcatenationHelper {
+public final class ConcatenationHelper {
 
   private static final String builderClass = "java/lang/StringBuilder";
   private static final String bufferClass = "java/lang/StringBuffer";

src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.modules.decompiler.exps.Exprent;
@@ -10,7 +10,7 @@ import java.util.List;
 import java.util.Set;
 
 
-public class DecHelper {
+public final class DecHelper {
 
   public static boolean checkStatementExceptions(List<? extends Statement> lst) {
 

src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.cfg.BasicBlock;
@@ -16,7 +16,7 @@ import org.jetbrains.java.decompiler.util.VBStyleCollection;
 
 import java.util.*;
 
-public class DomHelper {
+public final class DomHelper {
 
 
   private static RootStatement graphToStatement(ControlFlowGraph graph) {

src/org/jetbrains/java/decompiler/modules/decompiler/ExitHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.cfg.BasicBlock;
@@ -13,7 +13,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Set;
 
-public class ExitHelper {
+public final class ExitHelper {
   public static boolean condenseExits(RootStatement root) {
     int changed = integrateExits(root);
 

src/org/jetbrains/java/decompiler/modules/decompiler/FinallyProcessor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -26,6 +26,7 @@ import org.jetbrains.java.decompiler.modules.decompiler.stats.RootStatement;
 import org.jetbrains.java.decompiler.modules.decompiler.stats.Statement;
 import org.jetbrains.java.decompiler.modules.decompiler.vars.VarProcessor;
 import org.jetbrains.java.decompiler.modules.decompiler.vars.VarVersionPair;
+import org.jetbrains.java.decompiler.struct.StructClass;
 import org.jetbrains.java.decompiler.struct.StructMethod;
 import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
 import org.jetbrains.java.decompiler.struct.gen.VarType;
@@ -46,12 +47,8 @@ public class FinallyProcessor {
     varProcessor = varProc;
   }
 
-  public boolean iterateGraph(StructMethod mt, RootStatement root, ControlFlowGraph graph) {
-    return processStatementEx(mt, root, graph);
-  }
-
-  private boolean processStatementEx(StructMethod mt, RootStatement root, ControlFlowGraph graph) {
-    int bytecode_version = mt.getClassStruct().getBytecodeVersion();
+  public boolean iterateGraph(StructClass cl, StructMethod mt, RootStatement root, ControlFlowGraph graph) {
+    int bytecodeVersion = mt.getBytecodeVersion();
 
     LinkedList<Statement> stack = new LinkedList<>();
     stack.add(root);
@@ -77,22 +74,20 @@ public class FinallyProcessor {
           fin.setMonitor(var == null ? null : new VarExprent(var, VarType.VARTYPE_INT, varProcessor));
         }
         else {
-          Record inf = getFinallyInformation(mt, root, fin);
+          Record inf = getFinallyInformation(cl, mt, root, fin);
 
           if (inf == null) { // inconsistent finally
             catchallBlockIDs.put(handler.id, null);
           }
           else {
-
             if (DecompilerContext.getOption(IFernflowerPreferences.FINALLY_DEINLINE) && verifyFinallyEx(graph, fin, inf)) {
               finallyBlockIDs.put(handler.id, null);
             }
             else {
+              int varIndex = DecompilerContext.getCounterContainer().getCounterAndIncrement(CounterContainer.VAR_COUNTER);
+              insertSemaphore(graph, getAllBasicBlocks(fin.getFirst()), head, handler, varIndex, inf, bytecodeVersion);
 
-              int varindex = DecompilerContext.getCounterContainer().getCounterAndIncrement(CounterContainer.VAR_COUNTER);
-              insertSemaphore(graph, getAllBasicBlocks(fin.getFirst()), head, handler, varindex, inf, bytecode_version);
-
-              finallyBlockIDs.put(handler.id, varindex);
+              finallyBlockIDs.put(handler.id, varIndex);
             }
 
             DeadCodeHelper.removeDeadBlocks(graph); // e.g. multiple return blocks after a nested finally
@@ -110,7 +105,7 @@ public class FinallyProcessor {
     return false;
   }
 
-  private static class Record {
+  private static final class Record {
     private final int firstCode;
     private final Map<BasicBlock, Boolean> mapLast;
 
@@ -120,7 +115,7 @@ public class FinallyProcessor {
     }
   }
 
-  private Record getFinallyInformation(StructMethod mt, RootStatement root, CatchAllStatement fstat) {
+  private Record getFinallyInformation(StructClass cl, StructMethod mt, RootStatement root, CatchAllStatement fstat) {
     Map<BasicBlock, Boolean> mapLast = new HashMap<>();
 
     BasicBlockStatement firstBlockStatement = fstat.getHandler().getBasichead();
@@ -138,7 +133,7 @@ public class FinallyProcessor {
     }
 
     ExprProcessor proc = new ExprProcessor(methodDescriptor, varProcessor);
-    proc.processStatement(root, mt, mt.getClassStruct());
+    proc.processStatement(root, mt, cl);
 
     SSAConstructorSparseEx ssa = new SSAConstructorSparseEx();
     ssa.splitVariables(root, mt);
@@ -527,7 +522,7 @@ public class FinallyProcessor {
     return true;
   }
 
-  private static class Area {
+  private static final class Area {
     private final BasicBlock start;
     private final Set<BasicBlock> sample;
     private final BasicBlock next;

src/org/jetbrains/java/decompiler/modules/decompiler/IdeaNotNullHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -14,7 +14,7 @@ import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
 
 import java.util.List;
 
-public class IdeaNotNullHelper {
+public final class IdeaNotNullHelper {
 
 
   public static boolean removeHardcodedChecks(Statement root, StructMethod mt) {

src/org/jetbrains/java/decompiler/modules/decompiler/IfHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.modules.decompiler.exps.Exprent;
@@ -11,7 +11,7 @@ import org.jetbrains.java.decompiler.modules.decompiler.stats.Statement;
 
 import java.util.*;
 
-public class IfHelper {
+public final class IfHelper {
   public static boolean mergeAllIfs(RootStatement root) {
     boolean res = mergeAllIfsRec(root, new HashSet<>());
     if (res) {
@@ -31,7 +31,8 @@ public class IfHelper {
           res |= mergeAllIfsRec(st, setReorderedIfs);
 
           // collapse composed if's
-          if (changed = mergeIfs(st, setReorderedIfs)) {
+          if (mergeIfs(st, setReorderedIfs)) {
+            changed = true;
             break;
           }
         }
@@ -75,21 +76,25 @@ public class IfHelper {
             continue;
           }
 
-          if (updated = collapseIfIf(rtnode)) {
+          if (collapseIfIf(rtnode)) {
+            updated = true;
             break;
           }
 
           if (!setReorderedIfs.contains(stat.id)) {
-            if (updated = collapseIfElse(rtnode)) {
+            if (collapseIfElse(rtnode)) {
+              updated = true;
               break;
             }
 
-            if (updated = collapseElse(rtnode)) {
+            if (collapseElse(rtnode)) {
+              updated = true;
               break;
             }
           }
 
-          if (updated = reorderIf((IfStatement)stat)) {
+          if (reorderIf((IfStatement)stat)) {
+            updated = true;
             setReorderedIfs.add(stat.id);
             break;
           }
@@ -440,13 +445,12 @@ public class IfHelper {
         if (sttemp == ifstat) {
           break;
         }
-        else {
-          if (elsedirectpath = existsPath(sttemp, next)) {
+        else if (existsPath(sttemp, next)) {
+          elsedirectpath = true;
           break;
         }
       }
     }
-    }
 
     if ((ifdirect || ifdirectpath) && (elsedirect || elsedirectpath) && !noifstat && !noelsestat) {  // if - then - else
 

src/org/jetbrains/java/decompiler/modules/decompiler/InlineSingleBlockHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.modules.decompiler.stats.*;
@@ -7,7 +7,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 
-public class InlineSingleBlockHelper {
+public final class InlineSingleBlockHelper {
 
 
   public static boolean inlineSingleBlocks(RootStatement root) {

src/org/jetbrains/java/decompiler/modules/decompiler/LabelHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.modules.decompiler.exps.Exprent;
@@ -8,7 +8,7 @@ import java.util.*;
 import java.util.Map.Entry;
 
 
-public class LabelHelper {
+public final class LabelHelper {
 
 
   public static void cleanUpEdges(RootStatement root) {

src/org/jetbrains/java/decompiler/modules/decompiler/LoopExtractHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.modules.decompiler.stats.DoStatement;
@@ -11,7 +11,7 @@ import java.util.Arrays;
 import java.util.Set;
 
 
-public class LoopExtractHelper {
+public final class LoopExtractHelper {
 
 
   public static boolean extractLoops(Statement root) {

src/org/jetbrains/java/decompiler/modules/decompiler/MergeHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.cfg.BasicBlock;
@@ -13,7 +13,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 
-public class MergeHelper {
+public final class MergeHelper {
   public static void enhanceLoops(Statement root) {
     while (enhanceLoopsRec(root)) /**/;
     SequenceHelper.condenseSequences(root);

src/org/jetbrains/java/decompiler/modules/decompiler/SecondaryFunctionsHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -16,7 +16,7 @@ import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 
-public class SecondaryFunctionsHelper {
+public final class SecondaryFunctionsHelper {
 
   private static final int[] funcsnot = new int[]{
     FunctionExprent.FUNCTION_NE,
@@ -170,6 +170,17 @@ public class SecondaryFunctionsHelper {
               }
 
               if (desttype >= 0) {
+                if (functype != FunctionExprent.FUNCTION_LCMP) {
+                  boolean oneForNan = functype == FunctionExprent.FUNCTION_DCMPL || functype == FunctionExprent.FUNCTION_FCMPL;
+                  boolean trueForOne = desttype == FunctionExprent.FUNCTION_LT || desttype == FunctionExprent.FUNCTION_LE;
+                  boolean trueForNan = oneForNan == trueForOne;
+                  if (trueForNan) {
+                    List<Exprent> operands = new ArrayList<>();
+                    operands.add(new FunctionExprent(funcsnot[desttype - FunctionExprent.FUNCTION_EQ],
+                      funcexpr.getLstOperands(), funcexpr.bytecode));
+                    return new FunctionExprent(FunctionExprent.FUNCTION_BOOL_NOT, operands, funcexpr.bytecode);
+                  }
+                }
                 return new FunctionExprent(desttype, funcexpr.getLstOperands(), funcexpr.bytecode);
               }
             }
@@ -378,6 +389,7 @@ public class SecondaryFunctionsHelper {
           FunctionExprent fparam = (FunctionExprent)param;
 
           int ftype = fparam.getFuncType();
+          boolean canSimplify = false;
           switch (ftype) {
             case FunctionExprent.FUNCTION_BOOL_NOT:
               Exprent newexpr = fparam.getLstOperands().get(0);
@@ -394,16 +406,28 @@ public class SecondaryFunctionsHelper {
               }
             case FunctionExprent.FUNCTION_EQ:
             case FunctionExprent.FUNCTION_NE:
+              canSimplify = true;
             case FunctionExprent.FUNCTION_LT:
             case FunctionExprent.FUNCTION_GE:
             case FunctionExprent.FUNCTION_GT:
             case FunctionExprent.FUNCTION_LE:
+              if (!canSimplify) {
+                operands = fparam.getLstOperands();
+                VarType left = operands.get(0).getExprType();
+                VarType right = operands.get(1).getExprType();
+                VarType commonSupertype = VarType.getCommonSupertype(left, right);
+                if (commonSupertype != null) {
+                  canSimplify = commonSupertype.type != CodeConstants.TYPE_FLOAT && commonSupertype.type != CodeConstants.TYPE_DOUBLE;
+                }
+              }
+              if (canSimplify) {
                 fparam.setFuncType(funcsnot[ftype - FunctionExprent.FUNCTION_EQ]);
                 return fparam;
               }
           }
         }
       }
+    }
 
     return null;
   }

src/org/jetbrains/java/decompiler/modules/decompiler/SequenceHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.cfg.BasicBlock;
@@ -13,7 +13,7 @@ import java.util.HashSet;
 import java.util.List;
 
 
-public class SequenceHelper {
+public final class SequenceHelper {
 
 
   public static void condenseSequences(Statement root) {

src/org/jetbrains/java/decompiler/modules/decompiler/StrongConnectivityHelper.java

@@ -90,7 +90,9 @@ public class StrongConnectivityHelper {
     for (Statement stat : lst) {
       set.addAll(stat.getNeighbours(StatEdge.TYPE_REGULAR, Statement.DIRECTION_FORWARD));
     }
-    set.removeAll(lst);
+    for (Statement stat : lst) {
+      set.remove(stat);
+    }
 
     return (set.size() == 0);
   }

src/org/jetbrains/java/decompiler/modules/decompiler/SwitchHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -14,7 +14,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-public class SwitchHelper {
+public final class SwitchHelper {
   public static void simplify(SwitchStatement switchStatement) {
     SwitchExprent switchExprent = (SwitchExprent)switchStatement.getHeadexprent();
     Exprent value = switchExprent.getValue();

src/org/jetbrains/java/decompiler/modules/decompiler/decompose/DominatorTreeExceptionFilter.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.decompose;
 
 import org.jetbrains.java.decompiler.modules.decompiler.StatEdge;
@@ -127,16 +127,15 @@ public class DominatorTreeExceptionFilter {
           Set<Integer> range = entry.getValue();
 
           if (range.contains(id)) {
-
             Integer exit;
-
             if (!range.contains(childid)) {
               exit = childid;
             }
+            else if (map.containsKey(handler)) {
+              exit = -1;
+            }
             else {
-              // after replacing 'new Integer(-1)' with '-1' Eclipse throws a NullPointerException on the following line
-              // could be a bug in Eclipse or some obscure specification glitch, FIXME: needs further investigation
-              exit = map.containsKey(handler) ? new Integer(-1) : mapChild.get(handler);
+              exit = mapChild.get(handler);
             }
 
             if (exit != null) {

src/org/jetbrains/java/decompiler/modules/decompiler/deobfuscator/ExceptionDeobfuscator.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.deobfuscator;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -18,9 +18,9 @@ import org.jetbrains.java.decompiler.util.InterpreterUtil;
 import java.util.*;
 import java.util.Map.Entry;
 
-public class ExceptionDeobfuscator {
+public final class ExceptionDeobfuscator {
 
-  private static class Range {
+  private static final class Range {
     private final BasicBlock handler;
     private final String uniqueStr;
     private final Set<BasicBlock> protectedRange;

src/org/jetbrains/java/decompiler/modules/decompiler/deobfuscator/IrreducibleCFGDeobfuscator.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.deobfuscator;
 
 import org.jetbrains.java.decompiler.modules.decompiler.StatEdge;
@@ -10,7 +10,7 @@ import java.util.HashSet;
 import java.util.Set;
 
 
-public class IrreducibleCFGDeobfuscator {
+public final class IrreducibleCFGDeobfuscator {
 
 
   public static boolean isStatementIrreducible(Statement statement) {

src/org/jetbrains/java/decompiler/modules/decompiler/exps/ExprUtil.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.exps;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -13,7 +13,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-public class ExprUtil {
+public final class ExprUtil {
   public static List<VarVersionPair> getSyntheticParametersMask(String className, String descriptor, int parameters) {
     ClassNode node = DecompilerContext.getClassProcessor().getMapRootClasses().get(className);
     return node != null ? getSyntheticParametersMask(node, descriptor, parameters) : null;

src/org/jetbrains/java/decompiler/modules/decompiler/exps/NewExprent.java

@@ -26,7 +26,7 @@ import java.util.Set;
 public class NewExprent extends Exprent {
   private InvocationExprent constructor;
   private final VarType newType;
-  private List<Exprent> lstDims = new ArrayList<>();
+  private final List<Exprent> lstDims;
   private List<Exprent> lstArrayElements = new ArrayList<>();
   private boolean directArrayInit;
   private boolean isVarArgParam;

src/org/jetbrains/java/decompiler/modules/decompiler/exps/VarExprent.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.exps;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -31,7 +31,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class VarExprent extends Exprent {
-
   public static final int STACK_BASE = 10000;
   public static final String VAR_NAMELESS_ENCLOSURE = "<VAR_NAMELESS_ENCLOSURE>";
 
@@ -149,7 +148,7 @@ public class VarExprent extends Exprent {
       Integer origIndex = processor.getVarOriginalIndex(index);
       if (origIndex != null) {
         String name = attr.getName(origIndex, visibleOffset);
-        if (name != null && TextUtil.isValidIdentifier(name, method.getClassStruct().getBytecodeVersion())) {
+        if (name != null && TextUtil.isValidIdentifier(name, method.getBytecodeVersion())) {
           return name;
         }
       }

src/org/jetbrains/java/decompiler/modules/decompiler/sforms/FlattenStatementsHelper.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.sforms;
 
 import org.jetbrains.java.decompiler.modules.decompiler.StatEdge;
@@ -472,7 +472,7 @@ public class FlattenStatementsHelper {
     return mapDestinationNodes;
   }
 
-  public static class FinallyPathWrapper {
+  public static final class FinallyPathWrapper {
     public final String source;
     public final String destination;
     public final String entry;

src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchAllStatement.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.stats;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -17,7 +17,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Set;
 
-public class CatchAllStatement extends Statement {
+public final class CatchAllStatement extends Statement {
 
   private Statement handler;
 

src/org/jetbrains/java/decompiler/modules/decompiler/stats/CatchStatement.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.stats;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -17,7 +17,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 
-public class CatchStatement extends Statement {
+public final class CatchStatement extends Statement {
   private final List<List<String>> exctstrings = new ArrayList<>();
   private final List<VarExprent> vars = new ArrayList<>();
 

src/org/jetbrains/java/decompiler/modules/decompiler/stats/DoStatement.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.stats;
 
 import org.jetbrains.java.decompiler.main.collectors.BytecodeMappingTracer;
@@ -11,7 +11,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 
-public class DoStatement extends Statement {
+public final class DoStatement extends Statement {
 
   public static final int LOOP_DO = 0;
   public static final int LOOP_DOWHILE = 1;

src/org/jetbrains/java/decompiler/modules/decompiler/stats/IfStatement.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.stats;
 
 import org.jetbrains.java.decompiler.main.collectors.BytecodeMappingTracer;
@@ -17,7 +17,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 
-public class IfStatement extends Statement {
+public final class IfStatement extends Statement {
 
   public static final int IFTYPE_IF = 0;
   public static final int IFTYPE_IFELSE = 1;

src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statements.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.stats;
 
 import org.jetbrains.java.decompiler.main.rels.ClassWrapper;
@@ -8,7 +8,7 @@ import org.jetbrains.java.decompiler.modules.decompiler.exps.InvocationExprent;
 import org.jetbrains.java.decompiler.modules.decompiler.exps.VarExprent;
 import org.jetbrains.java.decompiler.modules.decompiler.vars.VarVersionPair;
 
-public class Statements {
+public final class Statements {
   public static Statement findFirstData(Statement stat) {
     if (stat.getExprents() != null) {
       return stat;

src/org/jetbrains/java/decompiler/modules/decompiler/stats/SwitchStatement.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.stats;
 
 import org.jetbrains.java.decompiler.code.SwitchInstruction;
@@ -19,7 +19,7 @@ import org.jetbrains.java.decompiler.util.TextBuffer;
 
 import java.util.*;
 
-public class SwitchStatement extends Statement {
+public final class SwitchStatement extends Statement {
 
   // *****************************************************************************
   // private fields

src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarProcessor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.modules.decompiler.vars;
 
 import org.jetbrains.java.decompiler.main.collectors.VarNamesCollector;
@@ -55,7 +55,7 @@ public class VarProcessor {
       Integer index = mapOriginalVarIndices.get(pair.var);
       if (index != null) {
         String debugName = mapDebugVarNames.get(index);
-        if (debugName != null && TextUtil.isValidIdentifier(debugName, method.getClassStruct().getBytecodeVersion())) {
+        if (debugName != null && TextUtil.isValidIdentifier(debugName, method.getBytecodeVersion())) {
           name = debugName;
         }
       }
@@ -72,11 +72,7 @@ public class VarProcessor {
   }
 
   public Integer getVarOriginalIndex(int index) {
-    if (varVersions == null) {
-      return null;
-    }
-
-    return varVersions.getMapOriginalVarIndices().get(index);
+    return varVersions == null ? null : varVersions.getMapOriginalVarIndices().get(index);
   }
 
   public void refreshVarNames(VarNamesCollector vc) {

src/org/jetbrains/java/decompiler/modules/decompiler/vars/VarTypeProcessor.java

@@ -170,7 +170,7 @@ public class VarTypeProcessor {
       case Exprent.EXPRENT_VAR:
         VarVersionPair pair = null;
         if (exprent.type == Exprent.EXPRENT_CONST) {
-          pair = new VarVersionPair(((ConstExprent)exprent).id, -1);
+          pair = new VarVersionPair(exprent.id, -1);
         }
         else if (exprent.type == Exprent.EXPRENT_VAR) {
           pair = new VarVersionPair((VarExprent)exprent);

src/org/jetbrains/java/decompiler/struct/ContextUnit.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct;
 
 import org.jetbrains.java.decompiler.main.DecompilerContext;
@@ -65,7 +65,7 @@ public class ContextUnit {
 
       StructClass newCl;
       try (DataInputFullStream in = loader.getClassStream(oldName)) {
-        newCl = new StructClass(in, cl.isOwn(), loader);
+        newCl = StructClass.create(in, cl.isOwn(), loader);
       }
 
       lstClasses.add(newCl);
@@ -92,6 +92,9 @@ public class ContextUnit {
         // classes
         for (int i = 0; i < classes.size(); i++) {
           StructClass cl = classes.get(i);
+          if (!cl.isOwn()) {
+            continue;
+          }
           String entryName = decompiledData.getClassEntryName(cl, classEntries.get(i));
           if (entryName != null) {
             String content = decompiledData.getClassContent(cl);

src/org/jetbrains/java/decompiler/struct/StructClass.java

@@ -1,7 +1,9 @@
-// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
+import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
+import org.jetbrains.java.decompiler.struct.attr.StructRecordAttribute;
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
 import org.jetbrains.java.decompiler.struct.consts.PrimitiveConstant;
 import org.jetbrains.java.decompiler.struct.lazy.LazyLoader;
@@ -10,6 +12,8 @@ import org.jetbrains.java.decompiler.util.InterpreterUtil;
 import org.jetbrains.java.decompiler.util.VBStyleCollection;
 
 import java.io.IOException;
+import java.util.List;
+import java.util.Map;
 
 /*
   class_file {
@@ -32,71 +36,86 @@ import java.io.IOException;
   }
 */
 public class StructClass extends StructMember {
-
-  public final String qualifiedName;
-  public final PrimitiveConstant superClass;
-
-  private final boolean own;
-  private final LazyLoader loader;
-  private final int minorVersion;
-  private final int majorVersion;
-  private final int[] interfaces;
-  private final String[] interfaceNames;
-  private final VBStyleCollection<StructField, String> fields;
-  private final VBStyleCollection<StructMethod, String> methods;
-
-  private ConstantPool pool;
-
-  public StructClass(byte[] bytes, boolean own, LazyLoader loader) throws IOException {
-    this(new DataInputFullStream(bytes), own, loader);
-  }
-
-  public StructClass(DataInputFullStream in, boolean own, LazyLoader loader) throws IOException {
-    this.own = own;
-    this.loader = loader;
-
+  public static StructClass create(DataInputFullStream in, boolean own, LazyLoader loader) throws IOException {
     in.discard(4);
+    int minorVersion = in.readUnsignedShort();
+    int majorVersion = in.readUnsignedShort();
+    int bytecodeVersion = Math.max(majorVersion, CodeConstants.BYTECODE_JAVA_LE_4);
 
-    minorVersion = in.readUnsignedShort();
-    majorVersion = in.readUnsignedShort();
+    ConstantPool pool = new ConstantPool(in);
 
-    pool = new ConstantPool(in);
-
-    accessFlags = in.readUnsignedShort();
+    int accessFlags = in.readUnsignedShort();
     int thisClassIdx = in.readUnsignedShort();
     int superClassIdx = in.readUnsignedShort();
-    qualifiedName = pool.getPrimitiveConstant(thisClassIdx).getString();
-    superClass = pool.getPrimitiveConstant(superClassIdx);
+    String qualifiedName = pool.getPrimitiveConstant(thisClassIdx).getString();
+    PrimitiveConstant superClass = pool.getPrimitiveConstant(superClassIdx);
 
-    // interfaces
     int length = in.readUnsignedShort();
-    interfaces = new int[length];
-    interfaceNames = new String[length];
+    int[] interfaces = new int[length];
+    String[] interfaceNames = new String[length];
     for (int i = 0; i < length; i++) {
       interfaces[i] = in.readUnsignedShort();
       interfaceNames[i] = pool.getPrimitiveConstant(interfaces[i]).getString();
     }
 
-    // fields
     length = in.readUnsignedShort();
-    fields = new VBStyleCollection<>(length);
+    VBStyleCollection<StructField, String>fields = new VBStyleCollection<>(length);
     for (int i = 0; i < length; i++) {
-      StructField field = new StructField(in, this);
+      StructField field = StructField.create(in, pool, qualifiedName);
       fields.addWithKey(field, InterpreterUtil.makeUniqueKey(field.getName(), field.getDescriptor()));
     }
 
-    // methods
     length = in.readUnsignedShort();
-    methods = new VBStyleCollection<>(length);
+    VBStyleCollection<StructMethod, String>methods = new VBStyleCollection<>(length);
     for (int i = 0; i < length; i++) {
-      StructMethod method = new StructMethod(in, this);
+      StructMethod method = StructMethod.create(in, pool, qualifiedName, bytecodeVersion, own);
       methods.addWithKey(method, InterpreterUtil.makeUniqueKey(method.getName(), method.getDescriptor()));
     }
 
-    // attributes
-    attributes = readAttributes(in, pool);
+    Map<String, StructGeneralAttribute> attributes = readAttributes(in, pool);
 
-    releaseResources();
+    StructClass cl = new StructClass(
+      accessFlags, attributes, qualifiedName, superClass, own, loader, minorVersion, majorVersion, interfaces, interfaceNames, fields, methods);
+    if (loader == null) cl.pool = pool;
+    return cl;
+  }
+
+  public final String qualifiedName;
+  public final PrimitiveConstant superClass;
+  private final boolean own;
+  private final LazyLoader loader;
+  private final int minorVersion;
+  private final int majorVersion;
+  private final int[] interfaces;
+  private final String[] interfaceNames;
+  private final VBStyleCollection<StructField, String> fields;
+  private final VBStyleCollection<StructMethod, String> methods;
+
+  private ConstantPool pool;
+
+  private StructClass(int accessFlags,
+                      Map<String, StructGeneralAttribute> attributes,
+                      String qualifiedName,
+                      PrimitiveConstant superClass,
+                      boolean own,
+                      LazyLoader loader,
+                      int minorVersion,
+                      int majorVersion,
+                      int[] interfaces,
+                      String[] interfaceNames,
+                      VBStyleCollection<StructField, String> fields,
+                      VBStyleCollection<StructMethod, String> methods) {
+    super(accessFlags, attributes);
+    this.qualifiedName = qualifiedName;
+    this.superClass = superClass;
+    this.own = own;
+    this.loader = loader;
+    this.minorVersion = minorVersion;
+    this.majorVersion = majorVersion;
+    this.interfaces = interfaces;
+    this.interfaceNames = interfaceNames;
+    this.fields = fields;
+    this.methods = methods;
   }
 
   public boolean hasField(String name, String descriptor) {
@@ -132,6 +151,15 @@ public class StructClass extends StructMember {
     return pool;
   }
 
+  /**
+   * @return list of record components; null if this class is not a record
+   */
+  public List<StructRecordComponent> getRecordComponents() {
+    StructRecordAttribute recordAttr = getAttribute(StructGeneralAttribute.ATTRIBUTE_RECORD);
+    if (recordAttr == null) return null;
+    return recordAttr.getComponents();
+  }
+
   public int[] getInterfaces() {
     return interfaces;
   }
@@ -156,17 +184,13 @@ public class StructClass extends StructMember {
     return loader;
   }
 
-  public boolean isVersionGE_1_5() {
+  public boolean isVersion5() {
     return (majorVersion > CodeConstants.BYTECODE_JAVA_LE_4 ||
             (majorVersion == CodeConstants.BYTECODE_JAVA_LE_4 && minorVersion > 0)); // FIXME: check second condition
   }
 
-  public boolean isVersionGE_1_7() {
-    return (majorVersion >= CodeConstants.BYTECODE_JAVA_7);
-  }
-
-  public int getBytecodeVersion() {
-    return Math.max(majorVersion, CodeConstants.BYTECODE_JAVA_LE_4);
+  public boolean isVersion8() {
+    return majorVersion >= CodeConstants.BYTECODE_JAVA_8;
   }
 
   @Override

src/org/jetbrains/java/decompiler/struct/StructContext.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct;
 
 import org.jetbrains.java.decompiler.main.DecompilerContext;
@@ -17,7 +17,6 @@ import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
 public class StructContext {
-
   private final IResultSaver saver;
   private final IDecompiledData decompiledData;
   private final LazyLoader loader;
@@ -106,7 +105,7 @@ public class StructContext {
 
       if (filename.endsWith(".class")) {
         try (DataInputFullStream in = loader.getClassStream(file.getAbsolutePath(), null)) {
-          StructClass cl = new StructClass(in, isOwn, loader);
+          StructClass cl = StructClass.create(in, isOwn, loader);
           classes.put(cl.qualifiedName, cl);
           unit.addClass(cl, filename);
           loader.addClassLink(cl.qualifiedName, new LazyLoader.Link(file.getAbsolutePath(), null));
@@ -141,7 +140,7 @@ public class StructContext {
         if (!entry.isDirectory()) {
           if (name.endsWith(".class")) {
             byte[] bytes = InterpreterUtil.getBytes(archive, entry);
-            StructClass cl = new StructClass(bytes, isOwn, loader);
+            StructClass cl = StructClass.create(new DataInputFullStream(bytes), isOwn, loader);
             classes.put(cl.qualifiedName, cl);
             unit.addClass(cl, name);
             loader.addClassLink(cl.qualifiedName, new LazyLoader.Link(file.getAbsolutePath(), name));

src/org/jetbrains/java/decompiler/struct/StructField.java

@@ -1,10 +1,12 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct;
 
+import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
 import org.jetbrains.java.decompiler.util.DataInputFullStream;
 
 import java.io.IOException;
+import java.util.Map;
 
 /*
   field_info {
@@ -16,29 +18,32 @@ import java.io.IOException;
    }
 */
 public class StructField extends StructMember {
+  public static StructField create(DataInputFullStream in, ConstantPool pool, String clQualifiedName) throws IOException {
+    int accessFlags = in.readUnsignedShort();
+    int nameIndex = in.readUnsignedShort();
+    int descriptorIndex = in.readUnsignedShort();
 
-  private final String name;
-  private final String descriptor;
+    String[] values = pool.getClassElement(ConstantPool.FIELD, clQualifiedName, nameIndex, descriptorIndex);
 
+    Map<String, StructGeneralAttribute> attributes = readAttributes(in, pool);
 
-  public StructField(DataInputFullStream in, StructClass clStruct) throws IOException {
-    accessFlags = in.readUnsignedShort();
-    int nameIndex = in.readUnsignedShort();
-    int descriptorIndex = in.readUnsignedShort();
+    return new StructField(accessFlags, attributes, values[0], values[1]);
+  }
 
-    ConstantPool pool = clStruct.getPool();
-    String[] values = pool.getClassElement(ConstantPool.FIELD, clStruct.qualifiedName, nameIndex, descriptorIndex);
-    name = values[0];
-    descriptor = values[1];
+  private final String name;
+  private final String descriptor;
 
-    attributes = readAttributes(in, pool);
+  protected StructField(int accessFlags, Map<String, StructGeneralAttribute> attributes, String name, String descriptor) {
+    super(accessFlags, attributes);
+    this.name = name;
+    this.descriptor = descriptor;
   }
 
-  public String getName() {
+  public final String getName() {
     return name;
   }
 
-  public String getDescriptor() {
+  public final String getDescriptor() {
     return descriptor;
   }
 

src/org/jetbrains/java/decompiler/struct/StructMember.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -12,23 +12,26 @@ import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
-public class StructMember {
-
-  protected int accessFlags;
-  protected Map<String, StructGeneralAttribute> attributes;
+public abstract class StructMember {
+  private final int accessFlags;
+  private final Map<String, StructGeneralAttribute> attributes;
 
+  protected StructMember(int accessFlags, Map<String, StructGeneralAttribute> attributes) {
+    this.accessFlags = accessFlags;
+    this.attributes = attributes;
+  }
 
   public int getAccessFlags() {
     return accessFlags;
   }
 
   public <T extends StructGeneralAttribute> T getAttribute(StructGeneralAttribute.Key<T> attribute) {
-    //noinspection unchecked
-    return (T)attributes.get(attribute.getName());
+    @SuppressWarnings("unchecked") T t = (T)attributes.get(attribute.name);
+    return t;
   }
 
   public boolean hasAttribute(StructGeneralAttribute.Key<?> attribute) {
-    return attributes.containsKey(attribute.getName());
+    return attributes.containsKey(attribute.name);
   }
 
   public boolean hasModifier(int modifier) {
@@ -39,45 +42,37 @@ public class StructMember {
     return hasModifier(CodeConstants.ACC_SYNTHETIC) || hasAttribute(StructGeneralAttribute.ATTRIBUTE_SYNTHETIC);
   }
 
-  protected Map<String, StructGeneralAttribute> readAttributes(DataInputFullStream in, ConstantPool pool) throws IOException {
+  public static Map<String, StructGeneralAttribute> readAttributes(DataInputFullStream in, ConstantPool pool) throws IOException {
     int length = in.readUnsignedShort();
-
     Map<String, StructGeneralAttribute> attributes = new HashMap<>(length);
+
     for (int i = 0; i < length; i++) {
       int nameIndex = in.readUnsignedShort();
       String name = pool.getPrimitiveConstant(nameIndex).getString();
 
-      StructGeneralAttribute attribute = readAttribute(in, pool, name);
-
-      if (attribute != null) {
-        if (StructGeneralAttribute.ATTRIBUTE_LOCAL_VARIABLE_TABLE.getName().equals(name) && attributes.containsKey(name)) {
+      StructGeneralAttribute attribute = StructGeneralAttribute.createAttribute(name);
+      int attLength = in.readInt();
+      if (attribute == null) {
+        in.discard(attLength);
+      }
+      else {
+        attribute.initContent(in, pool);
+        if (StructGeneralAttribute.ATTRIBUTE_LOCAL_VARIABLE_TABLE.name.equals(name) && attributes.containsKey(name)) {
           // merge all variable tables
           StructLocalVariableTableAttribute table = (StructLocalVariableTableAttribute)attributes.get(name);
           table.add((StructLocalVariableTableAttribute)attribute);
         }
-        else if (StructGeneralAttribute.ATTRIBUTE_LOCAL_VARIABLE_TYPE_TABLE.getName().equals(name) && attributes.containsKey(name)) {
+        else if (StructGeneralAttribute.ATTRIBUTE_LOCAL_VARIABLE_TYPE_TABLE.name.equals(name) && attributes.containsKey(name)) {
           // merge all variable tables
           StructLocalVariableTypeTableAttribute table = (StructLocalVariableTypeTableAttribute)attributes.get(name);
           table.add((StructLocalVariableTypeTableAttribute)attribute);
         }
         else {
-          attributes.put(attribute.getName(), attribute);
+          attributes.put(name, attribute);
         }
       }
     }
 
     return attributes;
   }
-
-  protected StructGeneralAttribute readAttribute(DataInputFullStream in, ConstantPool pool, String name) throws IOException {
-    StructGeneralAttribute attribute = StructGeneralAttribute.createAttribute(name);
-    int length = in.readInt();
-    if (attribute == null) {
-      in.discard(length);
-    }
-    else {
-      attribute.initContent(in, pool);
-    }
-    return attribute;
-  }
 }

src/org/jetbrains/java/decompiler/struct/StructMethod.java

@@ -1,7 +1,8 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct;
 
 import org.jetbrains.java.decompiler.code.*;
+import org.jetbrains.java.decompiler.struct.attr.StructCodeAttribute;
 import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
 import org.jetbrains.java.decompiler.struct.attr.StructLocalVariableTableAttribute;
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
@@ -25,80 +26,66 @@ import static org.jetbrains.java.decompiler.code.CodeConstants.*;
   }
 */
 public class StructMethod extends StructMember {
+  public static StructMethod create(DataInputFullStream in, ConstantPool pool, String clQualifiedName, int bytecodeVersion, boolean own) throws IOException {
+    int accessFlags = in.readUnsignedShort();
+    int nameIndex = in.readUnsignedShort();
+    int descriptorIndex = in.readUnsignedShort();
+
+    String[] values = pool.getClassElement(ConstantPool.METHOD, clQualifiedName, nameIndex, descriptorIndex);
+
+    Map<String, StructGeneralAttribute> attributes = readAttributes(in, pool);
+    StructCodeAttribute code = (StructCodeAttribute)attributes.remove(StructGeneralAttribute.ATTRIBUTE_CODE.name);
+    if (code != null) {
+      attributes.putAll(code.codeAttributes);
+    }
+
+    return new StructMethod(accessFlags, attributes, values[0], values[1], bytecodeVersion, own ? code : null);
+  }
+
   private static final int[] opr_iconst = {-1, 0, 1, 2, 3, 4, 5};
   private static final int[] opr_loadstore = {0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3};
   private static final int[] opcs_load = {opc_iload, opc_lload, opc_fload, opc_dload, opc_aload};
   private static final int[] opcs_store = {opc_istore, opc_lstore, opc_fstore, opc_dstore, opc_astore};
 
-  private final StructClass classStruct;
   private final String name;
   private final String descriptor;
-
-  private boolean containsCode = false;
-  private int localVariables = 0;
-  private int codeLength = 0;
-  private int codeFullLength = 0;
-  private InstructionSequence seq;
+  private final int bytecodeVersion;
+  private final int localVariables;
+  private final int codeLength;
+  private final int codeFullLength;
+  private InstructionSequence seq = null;
   private boolean expanded = false;
-  private Map<String, StructGeneralAttribute> codeAttributes;
-
-  public StructMethod(DataInputFullStream in, StructClass clStruct) throws IOException {
-    classStruct = clStruct;
-
-    accessFlags = in.readUnsignedShort();
-    int nameIndex = in.readUnsignedShort();
-    int descriptorIndex = in.readUnsignedShort();
-
-    ConstantPool pool = clStruct.getPool();
-    String[] values = pool.getClassElement(ConstantPool.METHOD, clStruct.qualifiedName, nameIndex, descriptorIndex);
-    name = values[0];
-    descriptor = values[1];
 
-    attributes = readAttributes(in, pool);
-    if (codeAttributes != null) {
-      attributes.putAll(codeAttributes);
-      codeAttributes = null;
-    }
-  }
-
-  @Override
-  protected StructGeneralAttribute readAttribute(DataInputFullStream in, ConstantPool pool, String name) throws IOException {
-    if (StructGeneralAttribute.ATTRIBUTE_CODE.getName().equals(name)) {
-      if (!classStruct.isOwn()) {
-        // skip code in foreign classes
-        in.discard(8);
-        in.discard(in.readInt());
-        in.discard(8 * in.readUnsignedShort());
+  private StructMethod(int accessFlags,
+                       Map<String, StructGeneralAttribute> attributes,
+                       String name,
+                       String descriptor,
+                       int bytecodeVersion,
+                       StructCodeAttribute code) {
+    super(accessFlags, attributes);
+    this.name = name;
+    this.descriptor = descriptor;
+    this.bytecodeVersion = bytecodeVersion;
+    if (code != null) {
+      this.localVariables = code.localVariables;
+      this.codeLength = code.codeLength;
+      this.codeFullLength = code.codeFullLength;
     }
     else {
-        containsCode = true;
-        in.discard(6);
-        localVariables = in.readUnsignedShort();
-        codeLength = in.readInt();
-        in.discard(codeLength);
-        int excLength = in.readUnsignedShort();
-        in.discard(excLength * 8);
-        codeFullLength = codeLength + excLength * 8 + 2;
-      }
-
-      codeAttributes = readAttributes(in, pool);
-
-      return null;
+      this.localVariables = this.codeLength = this.codeFullLength = -1;
     }
-
-    return super.readAttribute(in, pool, name);
   }
 
-  public void expandData() throws IOException {
-    if (containsCode && !expanded) {
-      byte[] code = classStruct.getLoader().loadBytecode(this, codeFullLength);
+  public void expandData(StructClass classStruct) throws IOException {
+    if (codeLength >= 0 && !expanded) {
+      byte[] code = classStruct.getLoader().loadBytecode(classStruct, this, codeFullLength);
       seq = parseBytecode(new DataInputFullStream(code), codeLength, classStruct.getPool());
       expanded = true;
     }
   }
 
   public void releaseResources() {
-    if (containsCode && expanded) {
+    if (codeLength >= 0 && expanded) {
       seq = null;
       expanded = false;
     }
@@ -108,10 +95,7 @@ public class StructMethod extends StructMember {
   private InstructionSequence parseBytecode(DataInputFullStream in, int length, ConstantPool pool) throws IOException {
     VBStyleCollection<Instruction, Integer> instructions = new VBStyleCollection<>();
 
-    int bytecode_version = classStruct.getBytecodeVersion();
-
     for (int i = 0; i < length; ) {
-
       int offset = i;
 
       int opcode = in.readUnsignedByte();
@@ -197,7 +181,7 @@ public class StructMethod extends StructMember {
             }
             break;
           case opc_invokedynamic:
-            if (classStruct.isVersionGE_1_7()) { // instruction unused in Java 6 and before
+            if (bytecodeVersion >= CodeConstants.BYTECODE_JAVA_7) { // instruction unused in Java 6 and before
               operands.add(in.readUnsignedShort());
               in.discard(2);
               group = GROUP_INVOCATION;
@@ -313,7 +297,7 @@ public class StructMethod extends StructMember {
         }
       }
 
-      Instruction instr = Instruction.create(opcode, wide, group, bytecode_version, ops);
+      Instruction instr = Instruction.create(opcode, wide, group, bytecodeVersion, ops);
 
       instructions.addWithKey(instr, offset);
 
@@ -355,10 +339,6 @@ public class StructMethod extends StructMember {
     return seq;
   }
 
-  public StructClass getClassStruct() {
-    return classStruct;
-  }
-
   public String getName() {
     return name;
   }
@@ -367,8 +347,12 @@ public class StructMethod extends StructMember {
     return descriptor;
   }
 
+  public int getBytecodeVersion() {
+    return bytecodeVersion;
+  }
+
   public boolean containsCode() {
-    return containsCode;
+    return codeLength >= 0;
   }
 
   public int getLocalVariables() {

src/org/jetbrains/java/decompiler/struct/StructRecordComponent.java

@@ -0,0 +1,36 @@
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jetbrains.java.decompiler.struct;
+
+import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
+import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
+import org.jetbrains.java.decompiler.struct.consts.PrimitiveConstant;
+import org.jetbrains.java.decompiler.util.DataInputFullStream;
+
+import java.io.IOException;
+import java.util.Map;
+
+/*
+  record_component_info {
+    u2 name_index;
+    u2 descriptor_index;
+    u2 attributes_count;
+    attribute_info attributes[attributes_count];
+   }
+*/
+public class StructRecordComponent extends StructField {
+  public static StructRecordComponent create(DataInputFullStream in, ConstantPool pool) throws IOException {
+    int nameIndex = in.readUnsignedShort();
+    int descriptorIndex = in.readUnsignedShort();
+
+    String name = ((PrimitiveConstant)pool.getConstant(nameIndex)).getString();
+    String descriptor = ((PrimitiveConstant)pool.getConstant(descriptorIndex)).getString();
+
+    Map<String, StructGeneralAttribute> attributes = readAttributes(in, pool);
+
+    return new StructRecordComponent(0, attributes, name, descriptor);
+  }
+
+  private StructRecordComponent(int flags, Map<String, StructGeneralAttribute> attributes, String name, String descriptor) {
+    super(flags, attributes, name, descriptor);
+  }
+}

src/org/jetbrains/java/decompiler/struct/attr/StructCodeAttribute.java

@@ -0,0 +1,43 @@
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jetbrains.java.decompiler.struct.attr;
+
+import org.jetbrains.java.decompiler.struct.StructMember;
+import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
+import org.jetbrains.java.decompiler.util.DataInputFullStream;
+
+import java.io.IOException;
+import java.util.Map;
+
+/*
+  u2 max_stack;
+  u2 max_locals;
+  u4 code_length;
+  u1 code[];
+  u2 exception_table_length;
+  exception_table[] {
+     u2 start_pc;
+     u2 end_pc;
+     u2 handler_pc;
+     u2 catch_type;
+  };
+  u2 attributes_count;
+  attribute_info attributes[];
+*/
+public class StructCodeAttribute extends StructGeneralAttribute {
+  public int localVariables = 0;
+  public int codeLength = 0;
+  public int codeFullLength = 0;
+  public Map<String, StructGeneralAttribute> codeAttributes;
+
+  @Override
+  public void initContent(DataInputFullStream data, ConstantPool pool) throws IOException {
+    data.discard(2);
+    localVariables = data.readUnsignedShort();
+    codeLength = data.readInt();
+    data.discard(codeLength);
+    int excLength = data.readUnsignedShort();
+    data.discard(excLength * 8);
+    codeFullLength = codeLength + excLength * 8 + 2;
+    codeAttributes = StructMember.readAttributes(data, pool);
+  }
+}

src/org/jetbrains/java/decompiler/struct/attr/StructGeneralAttribute.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.attr;
 
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
@@ -14,7 +14,7 @@ import java.io.IOException;
   }
 */
 public class StructGeneralAttribute {
-  public static final Key<StructGeneralAttribute> ATTRIBUTE_CODE = new Key<>("Code");
+  public static final Key<StructCodeAttribute> ATTRIBUTE_CODE = new Key<>("Code");
   public static final Key<StructInnerClassesAttribute> ATTRIBUTE_INNER_CLASSES = new Key<>("InnerClasses");
   public static final Key<StructGenericSignatureAttribute> ATTRIBUTE_SIGNATURE = new Key<>("Signature");
   public static final Key<StructAnnDefaultAttribute> ATTRIBUTE_ANNOTATION_DEFAULT = new Key<>("AnnotationDefault");
@@ -34,85 +34,81 @@ public class StructGeneralAttribute {
   public static final Key<StructGeneralAttribute> ATTRIBUTE_DEPRECATED = new Key<>("Deprecated");
   public static final Key<StructLineNumberTableAttribute> ATTRIBUTE_LINE_NUMBER_TABLE = new Key<>("LineNumberTable");
   public static final Key<StructMethodParametersAttribute> ATTRIBUTE_METHOD_PARAMETERS = new Key<>("MethodParameters");
+  public static final Key<StructModuleAttribute> ATTRIBUTE_MODULE = new Key<>("Module");
+  public static final Key<StructRecordAttribute> ATTRIBUTE_RECORD = new Key<>("Record");
   public static final Key<StructOriginalPcTableAttribute> ATTRIBUTE_ORIGINAL_PC_TABLE = new Key<>("OriginalPcTable");
 
+  @SuppressWarnings("unused")
   public static class Key<T extends StructGeneralAttribute> {
-    private final String name;
+    public final String name;
 
     public Key(String name) {
       this.name = name;
     }
-
-    public String getName() {
-      return name;
-    }
   }
 
-  private String name;
-
   public static StructGeneralAttribute createAttribute(String name) {
-    StructGeneralAttribute attr;
-
-    if (ATTRIBUTE_INNER_CLASSES.getName().equals(name)) {
-      attr = new StructInnerClassesAttribute();
+    if (ATTRIBUTE_CODE.name.equals(name)) {
+      return new StructCodeAttribute();
+    }
+    else if (ATTRIBUTE_INNER_CLASSES.name.equals(name)) {
+      return new StructInnerClassesAttribute();
     }
-    else if (ATTRIBUTE_CONSTANT_VALUE.getName().equals(name)) {
-      attr = new StructConstantValueAttribute();
+    else if (ATTRIBUTE_CONSTANT_VALUE.name.equals(name)) {
+      return new StructConstantValueAttribute();
     }
-    else if (ATTRIBUTE_SIGNATURE.getName().equals(name)) {
-      attr = new StructGenericSignatureAttribute();
+    else if (ATTRIBUTE_SIGNATURE.name.equals(name)) {
+      return new StructGenericSignatureAttribute();
     }
-    else if (ATTRIBUTE_ANNOTATION_DEFAULT.getName().equals(name)) {
-      attr = new StructAnnDefaultAttribute();
+    else if (ATTRIBUTE_ANNOTATION_DEFAULT.name.equals(name)) {
+      return new StructAnnDefaultAttribute();
     }
-    else if (ATTRIBUTE_EXCEPTIONS.getName().equals(name)) {
-      attr = new StructExceptionsAttribute();
+    else if (ATTRIBUTE_EXCEPTIONS.name.equals(name)) {
+      return new StructExceptionsAttribute();
     }
-    else if (ATTRIBUTE_ENCLOSING_METHOD.getName().equals(name)) {
-      attr = new StructEnclosingMethodAttribute();
+    else if (ATTRIBUTE_ENCLOSING_METHOD.name.equals(name)) {
+      return new StructEnclosingMethodAttribute();
     }
-    else if (ATTRIBUTE_RUNTIME_VISIBLE_ANNOTATIONS.getName().equals(name) || ATTRIBUTE_RUNTIME_INVISIBLE_ANNOTATIONS.getName().equals(name)) {
-      attr = new StructAnnotationAttribute();
+    else if (ATTRIBUTE_RUNTIME_VISIBLE_ANNOTATIONS.name.equals(name) || ATTRIBUTE_RUNTIME_INVISIBLE_ANNOTATIONS.name.equals(name)) {
+      return new StructAnnotationAttribute();
     }
-    else if (ATTRIBUTE_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS.getName().equals(name) || ATTRIBUTE_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS.getName().equals(name)) {
-      attr = new StructAnnotationParameterAttribute();
+    else if (ATTRIBUTE_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS.name.equals(name) || ATTRIBUTE_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS.name.equals(name)) {
+      return new StructAnnotationParameterAttribute();
     }
-    else if (ATTRIBUTE_RUNTIME_VISIBLE_TYPE_ANNOTATIONS.getName().equals(name) || ATTRIBUTE_RUNTIME_INVISIBLE_TYPE_ANNOTATIONS.getName().equals(name)) {
-      attr = new StructTypeAnnotationAttribute();
+    else if (ATTRIBUTE_RUNTIME_VISIBLE_TYPE_ANNOTATIONS.name.equals(name) || ATTRIBUTE_RUNTIME_INVISIBLE_TYPE_ANNOTATIONS.name.equals(name)) {
+      return new StructTypeAnnotationAttribute();
     }
-    else if (ATTRIBUTE_LOCAL_VARIABLE_TABLE.getName().equals(name)) {
-      attr = new StructLocalVariableTableAttribute();
+    else if (ATTRIBUTE_LOCAL_VARIABLE_TABLE.name.equals(name)) {
+      return new StructLocalVariableTableAttribute();
     }
-    else if (ATTRIBUTE_LOCAL_VARIABLE_TYPE_TABLE.getName().equals(name)) {
-      attr = new StructLocalVariableTypeTableAttribute();
+    else if (ATTRIBUTE_LOCAL_VARIABLE_TYPE_TABLE.name.equals(name)) {
+      return new StructLocalVariableTypeTableAttribute();
     }
-    else if (ATTRIBUTE_BOOTSTRAP_METHODS.getName().equals(name)) {
-      attr = new StructBootstrapMethodsAttribute();
+    else if (ATTRIBUTE_BOOTSTRAP_METHODS.name.equals(name)) {
+      return new StructBootstrapMethodsAttribute();
     }
-    else if (ATTRIBUTE_SYNTHETIC.getName().equals(name) || ATTRIBUTE_DEPRECATED.getName().equals(name)) {
-      attr = new StructGeneralAttribute();
+    else if (ATTRIBUTE_SYNTHETIC.name.equals(name) || ATTRIBUTE_DEPRECATED.name.equals(name)) {
+      return new StructGeneralAttribute();
     }
-    else if (ATTRIBUTE_LINE_NUMBER_TABLE.getName().equals(name)) {
-      attr = new StructLineNumberTableAttribute();
+    else if (ATTRIBUTE_LINE_NUMBER_TABLE.name.equals(name)) {
+      return new StructLineNumberTableAttribute();
     }
-    else if (ATTRIBUTE_METHOD_PARAMETERS.getName().equals(name)) {
-      attr = new StructMethodParametersAttribute();
+    else if (ATTRIBUTE_METHOD_PARAMETERS.name.equals(name)) {
+      return new StructMethodParametersAttribute();
     }
-    else if (ATTRIBUTE_ORIGINAL_PC_TABLE.getName().equals(name)) {
-      attr = new StructOriginalPcTableAttribute();
+    else if (ATTRIBUTE_MODULE.name.equals(name)) {
+      return new StructModuleAttribute();
+    }
+    else if (ATTRIBUTE_RECORD.name.equals(name)) {
+      return new StructRecordAttribute();
+    }
+    else if (ATTRIBUTE_ORIGINAL_PC_TABLE.name.equals(name)) {
+      return new StructOriginalPcTableAttribute();
     }
     else {
-      // unsupported attribute
-      return null;
+      return null; // unsupported attribute
     }
-
-    attr.name = name;
-    return attr;
   }
 
   public void initContent(DataInputFullStream data, ConstantPool pool) throws IOException { }
-
-  public String getName() {
-    return name;
-  }
 }

src/org/jetbrains/java/decompiler/struct/attr/StructInnerClassesAttribute.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.attr;
 
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
@@ -10,7 +10,7 @@ import java.util.Collections;
 import java.util.List;
 
 public class StructInnerClassesAttribute extends StructGeneralAttribute {
-  public static class Entry {
+  public static final class Entry {
     public final int outerNameIdx;
     public final int simpleNameIdx;
     public final int accessFlags;

src/org/jetbrains/java/decompiler/struct/attr/StructLocalVariableTableAttribute.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.attr;
 
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
@@ -71,7 +71,7 @@ public class StructLocalVariableTableAttribute extends StructGeneralAttribute {
     return localVariables.stream().filter(v -> v.start_pc == 0).collect(Collectors.toMap(v -> v.index, v -> v.name, (n1, n2) -> n2));
   }
 
-  private static class LocalVariable {
+  private static final class LocalVariable {
     final int start_pc;
     final int length;
     final String name;

src/org/jetbrains/java/decompiler/struct/attr/StructModuleAttribute.java

@@ -0,0 +1,165 @@
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jetbrains.java.decompiler.struct.attr;
+
+import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
+import org.jetbrains.java.decompiler.util.DataInputFullStream;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class StructModuleAttribute extends StructGeneralAttribute {
+  public String moduleName;
+  public int moduleFlags;
+  public String moduleVersion;
+
+  public List<RequiresEntry> requires;
+  public List<ExportsEntry> exports;
+  public List<OpensEntry> opens;
+  public List<String> uses;
+  public List<ProvidesEntry> provides;
+
+  @Override
+  public void initContent(DataInputFullStream data, ConstantPool pool) throws IOException {
+    int moduleNameIndex = data.readUnsignedShort();
+    this.moduleName = pool.getPrimitiveConstant(moduleNameIndex).getString();
+    this.moduleFlags = data.readUnsignedShort();
+
+    int moduleVersionIndex = data.readUnsignedShort();
+    if (moduleVersionIndex != 0) {
+      moduleVersion = pool.getPrimitiveConstant(moduleVersionIndex).getString();
+    }
+
+    this.requires = readRequires(data, pool);
+    this.exports = readExports(data, pool);
+    this.opens = readOpens(data, pool);
+    this.uses = readUses(data, pool);
+    this.provides = readProvides(data, pool);
+  }
+
+  public List<RequiresEntry> readRequires(DataInputFullStream data, ConstantPool pool) throws IOException {
+    int requiresCount = data.readUnsignedShort();
+    if (requiresCount <= 0) return Collections.emptyList();
+
+    List<RequiresEntry> requires = new ArrayList<>(requiresCount);
+    for (int i = 0; i < requiresCount; i++) {
+      int moduleNameIndex = data.readUnsignedShort();
+      int requiresFlags = data.readUnsignedShort();
+      int versionIndex = data.readUnsignedShort();
+      String moduleName = pool.getPrimitiveConstant(moduleNameIndex).getString();
+      String version = versionIndex == 0 ? null : pool.getPrimitiveConstant(versionIndex).getString();
+      requires.add(new RequiresEntry(moduleName, requiresFlags, version));
+    }
+    return requires;
+  }
+
+  private static List<ExportsEntry> readExports(DataInputFullStream data, ConstantPool pool) throws IOException {
+    int exportsCount = data.readUnsignedShort();
+    if (exportsCount <= 0) return Collections.emptyList();
+
+    List<ExportsEntry> exports = new ArrayList<>(exportsCount);
+    for (int i = 0; i < exportsCount; i++) {
+      int packageNameIndex = data.readUnsignedShort();
+      int exportsFlags = data.readUnsignedShort();
+      List<String> exportsToModules = readStringList(data, pool);
+      String packageName = pool.getPrimitiveConstant(packageNameIndex).getString();
+      exports.add(new ExportsEntry(packageName, exportsFlags, exportsToModules));
+    }
+    return exports;
+  }
+
+  private static List<OpensEntry> readOpens(DataInputFullStream data, ConstantPool pool) throws IOException {
+    int opensCount = data.readUnsignedShort();
+    if (opensCount <= 0) return Collections.emptyList();
+
+    List<OpensEntry> opens = new ArrayList<>(opensCount);
+    for (int i = 0; i < opensCount; i++) {
+      int packageNameIndex = data.readUnsignedShort();
+      int opensFlags = data.readUnsignedShort();
+      List<String> opensToModules = readStringList(data, pool);
+      String packageName = pool.getPrimitiveConstant(packageNameIndex).getString();
+      opens.add(new OpensEntry(packageName, opensFlags, opensToModules));
+    }
+    return opens;
+  }
+
+  private static List<String> readUses(DataInputFullStream data, ConstantPool pool) throws IOException {
+    return readStringList(data, pool);
+  }
+
+  private static List<ProvidesEntry> readProvides(DataInputFullStream data, ConstantPool pool) throws IOException {
+    int providesCount = data.readUnsignedShort();
+    if (providesCount <= 0) return Collections.emptyList();
+
+    List<ProvidesEntry> provides = new ArrayList<>(providesCount);
+    for (int i = 0; i < providesCount; i++) {
+      int interfaceNameIndex = data.readUnsignedShort();
+      String interfaceName = pool.getPrimitiveConstant(interfaceNameIndex).getString();
+      List<String> implementationNames = readStringList(data, pool);
+      provides.add(new ProvidesEntry(interfaceName, implementationNames));
+    }
+    return provides;
+  }
+
+  private static List<String> readStringList(DataInputFullStream data, ConstantPool pool) throws IOException {
+    int count = data.readUnsignedShort();
+    if (count <= 0) {
+      return Collections.emptyList();
+    }
+    else {
+      List<String> strings = new ArrayList<>(count);
+      for (int i = 0; i < count; i++) {
+        int index = data.readUnsignedShort();
+        strings.add(pool.getPrimitiveConstant(index).getString());
+      }
+      return strings;
+    }
+  }
+
+  public static final class RequiresEntry {
+    public final String moduleName;
+    public final int flags;
+    public final String moduleVersion;
+
+    public RequiresEntry(String moduleName, int flags, String moduleVersion) {
+      this.moduleName = moduleName;
+      this.flags = flags;
+      this.moduleVersion = moduleVersion;
+    }
+  }
+
+  public static final class ExportsEntry {
+    public final String packageName;
+    public final int flags;
+    public final List<String> exportToModules;
+
+    public ExportsEntry(String packageName, int flags, List<String> exportToModules) {
+      this.packageName = packageName;
+      this.flags = flags;
+      this.exportToModules = exportToModules;
+    }
+  }
+
+  public static final class OpensEntry {
+    public final String packageName;
+    public final int flags;
+    public final List<String> opensToModules;
+
+    public OpensEntry(String packageName, int flags, List<String> exportToModules) {
+      this.packageName = packageName;
+      this.flags = flags;
+      this.opensToModules = exportToModules;
+    }
+  }
+
+  public static final class ProvidesEntry {
+    public final String interfaceName;
+    public final List<String> implementationNames;
+
+    public ProvidesEntry(String interfaceName, List<String> implementationNames) {
+      this.interfaceName = interfaceName;
+      this.implementationNames = implementationNames;
+    }
+  }
+}

src/org/jetbrains/java/decompiler/struct/attr/StructRecordAttribute.java

@@ -0,0 +1,37 @@
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jetbrains.java.decompiler.struct.attr;
+
+import org.jetbrains.java.decompiler.struct.StructRecordComponent;
+import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
+import org.jetbrains.java.decompiler.util.DataInputFullStream;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+/*
+  Record_attribute {
+      u2 attribute_name_index;
+      u4 attribute_length;
+      u2 components_count;
+      record_component_info components[components_count];
+  }
+ */
+public class StructRecordAttribute extends StructGeneralAttribute {
+  List<StructRecordComponent> components;
+  
+  @Override
+  public void initContent(DataInputFullStream data, ConstantPool pool) throws IOException {
+    int componentCount = data.readUnsignedShort();
+    StructRecordComponent[] components = new StructRecordComponent[componentCount];
+    for (int i = 0; i < componentCount; i++) {
+      components[i] = StructRecordComponent.create(data, pool);
+    }
+    this.components = Arrays.asList(components);
+  }
+
+  public List<StructRecordComponent> getComponents() {
+    return Collections.unmodifiableList(components);
+  }
+}

src/org/jetbrains/java/decompiler/struct/consts/ConstantPool.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.consts;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -64,6 +64,8 @@ public class ConstantPool implements NewClassNameBuilder {
         case CodeConstants.CONSTANT_Class:
         case CodeConstants.CONSTANT_String:
         case CodeConstants.CONSTANT_MethodType:
+        case CodeConstants.CONSTANT_Module:
+        case CodeConstants.CONSTANT_Package:
           pool.add(new PrimitiveConstant(tag, in.readUnsignedShort()));
           nextPass[0].set(i);
           break;
@@ -210,18 +212,12 @@ public class ConstantPool implements NewClassNameBuilder {
     String newName = interceptor.getName(vt.value);
     if (newName != null) {
       StringBuilder buffer = new StringBuilder();
-
       if (vt.arrayDim > 0) {
-        for (int i = 0; i < vt.arrayDim; i++) {
-          buffer.append('[');
-        }
-
-        buffer.append('L').append(newName).append(';');
+        buffer.append("[".repeat(vt.arrayDim)).append('L').append(newName).append(';');
       }
       else {
         buffer.append(newName);
       }
-
       return buffer.toString();
     }
 

src/org/jetbrains/java/decompiler/struct/consts/LinkConstant.java

@@ -26,10 +26,11 @@ public class LinkConstant extends PooledConstant {
     if (type == CONSTANT_Methodref ||
         type == CONSTANT_InterfaceMethodref ||
         type == CONSTANT_InvokeDynamic ||
-        type == CONSTANT_MethodHandle) {
+        (type == CONSTANT_MethodHandle && index1 != CONSTANT_MethodHandle_REF_getField && index1 != CONSTANT_MethodHandle_REF_putField)) {
       int parenth = descriptor.indexOf(')');
       if (descriptor.length() < 2 || parenth < 0 || descriptor.charAt(0) != '(') {
-        throw new IllegalArgumentException("Invalid descriptor: " + descriptor);
+        throw new IllegalArgumentException("Invalid descriptor: " + descriptor +
+                                           "; type = " + type + "; classname = " + classname + "; elementname = " + elementname);
       }
     }
   }

src/org/jetbrains/java/decompiler/struct/consts/PrimitiveConstant.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.consts;
 
 public class PrimitiveConstant extends PooledConstant {
@@ -31,7 +31,7 @@ public class PrimitiveConstant extends PooledConstant {
 
   @Override
   public void resolveConstant(ConstantPool pool) {
-    if (type == CONSTANT_Class || type == CONSTANT_String || type == CONSTANT_MethodType) {
+    if (type == CONSTANT_Class || type == CONSTANT_String || type == CONSTANT_MethodType || type == CONSTANT_Module || type == CONSTANT_Package) {
       value = pool.getPrimitiveConstant(index).getString();
       initConstant();
     }

src/org/jetbrains/java/decompiler/struct/gen/FieldDescriptor.java

@@ -1,9 +1,9 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.gen;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
 
-public class FieldDescriptor {
+public final class FieldDescriptor {
 
   public static final FieldDescriptor INTEGER_DESCRIPTOR = parseDescriptor("Ljava/lang/Integer;");
   public static final FieldDescriptor LONG_DESCRIPTOR = parseDescriptor("Ljava/lang/Long;");

src/org/jetbrains/java/decompiler/struct/gen/MethodDescriptor.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.gen;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -7,7 +7,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-public class MethodDescriptor {
+public final class MethodDescriptor {
   public final VarType[] params;
   public final VarType ret;
 
@@ -68,8 +68,7 @@ public class MethodDescriptor {
 
     VarType[] newParams;
     if (params.length > 0) {
-      newParams = new VarType[params.length];
-      System.arraycopy(params, 0, newParams, 0, params.length);
+      newParams = params.clone();
       for (int i = 0; i < params.length; i++) {
         VarType substitute = buildNewType(params[i], builder);
         if (substitute != null) {

src/org/jetbrains/java/decompiler/struct/gen/generics/GenericMain.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.gen.generics;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -9,7 +9,7 @@ import org.jetbrains.java.decompiler.util.TextUtil;
 import java.util.ArrayList;
 import java.util.List;
 
-public class GenericMain {
+public final class GenericMain {
 
   private static final String[] typeNames = {
     "byte",

src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java

@@ -1,7 +1,8 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.struct.lazy;
 
 import org.jetbrains.java.decompiler.main.extern.IBytecodeProvider;
+import org.jetbrains.java.decompiler.struct.StructClass;
 import org.jetbrains.java.decompiler.struct.StructMethod;
 import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
@@ -19,20 +20,20 @@ public class LazyLoader {
     this.provider = provider;
   }
 
-  public void addClassLink(String classname, Link link) {
-    mapClassLinks.put(classname, link);
+  public void addClassLink(String className, Link link) {
+    mapClassLinks.put(className, link);
   }
 
-  public void removeClassLink(String classname) {
-    mapClassLinks.remove(classname);
+  public void removeClassLink(String className) {
+    mapClassLinks.remove(className);
   }
 
-  public Link getClassLink(String classname) {
-    return mapClassLinks.get(classname);
+  public Link getClassLink(String className) {
+    return mapClassLinks.get(className);
   }
 
-  public ConstantPool loadPool(String classname) {
-    try (DataInputFullStream in = getClassStream(classname)) {
+  public ConstantPool loadPool(String className) {
+    try (DataInputFullStream in = getClassStream(className)) {
       if (in != null) {
         in.discard(8);
         return new ConstantPool(in);
@@ -45,14 +46,14 @@ public class LazyLoader {
     }
   }
 
-  public byte[] loadBytecode(StructMethod mt, int codeFullLength) {
-    String className = mt.getClassStruct().qualifiedName;
+  public byte[] loadBytecode(StructClass classStruct, StructMethod mt, int codeFullLength) {
+    String className = classStruct.qualifiedName;
 
     try (DataInputFullStream in = getClassStream(className)) {
       if (in != null) {
         in.discard(8);
 
-        ConstantPool pool = mt.getClassStruct().getPool();
+        ConstantPool pool = classStruct.getPool();
         if (pool == null) {
           pool = new ConstantPool(in);
         }
@@ -90,7 +91,7 @@ public class LazyLoader {
           for (int j = 0; j < attrSize; j++) {
             int attrNameIndex = in.readUnsignedShort();
             String attrName = pool.getPrimitiveConstant(attrNameIndex).getString();
-            if (!StructGeneralAttribute.ATTRIBUTE_CODE.getName().equals(attrName)) {
+            if (!StructGeneralAttribute.ATTRIBUTE_CODE.name.equals(attrName)) {
               in.discard(in.readInt());
               continue;
             }

src/org/jetbrains/java/decompiler/util/FastFixedSetFactory.java

@@ -1,10 +1,7 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.util;
 
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.Set;
+import java.util.*;
 
 public class FastFixedSetFactory<E> {
 
@@ -46,7 +43,7 @@ public class FastFixedSetFactory<E> {
     return colValuesInternal;
   }
 
-  public static class FastFixedSet<E> implements Iterable<E> {
+  public static final class FastFixedSet<E> implements Iterable<E> {
 
     private final FastFixedSetFactory<E> factory;
 
@@ -66,8 +63,7 @@ public class FastFixedSetFactory<E> {
       FastFixedSet<E> copy = new FastFixedSet<>(factory);
 
       int arrlength = data.length;
-      int[] cpdata = new int[arrlength];
-      System.arraycopy(data, 0, cpdata, 0, arrlength);
+      int[] cpdata = Arrays.copyOf(data, arrlength);
       copy.setData(cpdata);
 
       return copy;
@@ -242,7 +238,7 @@ public class FastFixedSetFactory<E> {
     }
   }
 
-  public static class FastFixedSetIterator<E> implements Iterator<E> {
+  public static final class FastFixedSetIterator<E> implements Iterator<E> {
 
     private final VBStyleCollection<int[], E> colValuesInternal;
     private final int[] data;

src/org/jetbrains/java/decompiler/util/FastSparseSetFactory.java

@@ -1,10 +1,7 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.util;
 
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.Set;
+import java.util.*;
 
 public class FastSparseSetFactory<E> {
 
@@ -69,7 +66,7 @@ public class FastSparseSetFactory<E> {
   }
 
 
-  public static class FastSparseSet<E> implements Iterable<E> {
+  public static final class FastSparseSet<E> implements Iterable<E> {
     public static final FastSparseSet[] EMPTY_ARRAY = new FastSparseSet[0];
 
     private final FastSparseSetFactory<E> factory;
@@ -97,15 +94,7 @@ public class FastSparseSetFactory<E> {
     }
 
     public FastSparseSet<E> getCopy() {
-
-      int arrlength = data.length;
-      int[] cpdata = new int[arrlength];
-      int[] cpnext = new int[arrlength];
-
-      System.arraycopy(data, 0, cpdata, 0, arrlength);
-      System.arraycopy(next, 0, cpnext, 0, arrlength);
-
-      return new FastSparseSet<>(factory, cpdata, cpnext);
+      return new FastSparseSet<>(factory, data.clone(), next.clone());
     }
 
     private int[] ensureCapacity(int index) {
@@ -119,15 +108,10 @@ public class FastSparseSetFactory<E> {
         newlength *= 2;
       }
 
-      int[] newdata = new int[newlength];
-      System.arraycopy(data, 0, newdata, 0, data.length);
-      data = newdata;
+      data = Arrays.copyOf(data, newlength);
+      next = Arrays.copyOf(next, newlength);
 
-      int[] newnext = new int[newlength];
-      System.arraycopy(next, 0, newnext, 0, next.length);
-      next = newnext;
-
-      return newdata;
+      return data;
     }
 
     public void add(E element) {
@@ -360,7 +344,7 @@ public class FastSparseSetFactory<E> {
     }
   }
 
-  public static class FastSparseSetIterator<E> implements Iterator<E> {
+  public static final class FastSparseSetIterator<E> implements Iterator<E> {
 
     private final VBStyleCollection<int[], E> colValuesInternal;
     private final int[] data;

src/org/jetbrains/java/decompiler/util/InterpreterUtil.java

@@ -1,4 +1,4 @@
-// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.util;
 
 import java.io.*;
@@ -8,7 +8,7 @@ import java.util.List;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
-public class InterpreterUtil {
+public final class InterpreterUtil {
   public static final boolean IS_WINDOWS = System.getProperty("os.name", "").startsWith("Windows");
 
   public static final int[] EMPTY_INT_ARRAY = new int[0];

src/org/jetbrains/java/decompiler/util/SFormsFastMapDirect.java

@@ -5,6 +5,7 @@ import org.jetbrains.java.decompiler.modules.decompiler.exps.VarExprent;
 import org.jetbrains.java.decompiler.util.FastSparseSetFactory.FastSparseSet;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map.Entry;
 import java.util.Set;
@@ -66,9 +67,7 @@ public class SFormsFastMapDirect {
         int[] arrnext = next[i];
 
         @SuppressWarnings("unchecked") FastSparseSet<Integer>[] arrnew = new FastSparseSet[length];
-        int[] arrnextnew = new int[length];
-
-        System.arraycopy(arrnext, 0, arrnextnew, 0, length);
+        int[] arrnextnew = Arrays.copyOf(arrnext, length);
 
         mapelements[i] = arrnew;
         mapnext[i] = arrnextnew;
@@ -343,7 +342,7 @@ public class SFormsFastMapDirect {
         if (ent != null) {
           final int key = i == 0 ? ikey : (i == 1 ? ikey + VarExprent.STACK_BASE : -ikey);
 
-          list.add(new Entry<Integer, FastSparseSet<Integer>>() {
+          list.add(new Entry<>() {
 
             private final Integer var = key;
             private final FastSparseSet<Integer> val = ent;

src/org/jetbrains/java/decompiler/util/TextUtil.java

@@ -1,6 +1,4 @@
-/*
- * Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
- */
+// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler.util;
 
 import org.jetbrains.java.decompiler.code.CodeConstants;
@@ -12,7 +10,7 @@ import org.jetbrains.java.decompiler.modules.decompiler.ExprProcessor;
 import java.util.Arrays;
 import java.util.HashSet;
 
-public class TextUtil {
+public final class TextUtil {
   private static final HashSet<String> KEYWORDS = new HashSet<>(Arrays.asList(
     "abstract", "default", "if", "private", "this", "boolean", "do", "implements", "protected", "throw", "break", "double", "import",
     "public", "throws", "byte", "else", "instanceof", "return", "transient", "case", "extends", "int", "short", "try", "catch", "final",

test/org/jetbrains/java/decompiler/SingleClassesTest.java

@@ -1,11 +1,13 @@
-// Copyright 2000-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.java.decompiler;
 
 import org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler;
 import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.Timeout;
 
 import java.io.File;
 import java.io.IOException;
@@ -19,6 +21,13 @@ import static org.junit.Assert.assertTrue;
 public class SingleClassesTest {
   private DecompilerTestFixture fixture;
 
+  /*
+   * Set individual test duration time limit to 60 seconds.
+   * This will help us to test bugs hanging decompiler.
+   */
+  @Rule
+  public Timeout globalTimeout = Timeout.seconds(60);
+
   @Before
   public void setUp() throws IOException {
     fixture = new DecompilerTestFixture();
@@ -70,10 +79,10 @@ public class SingleClassesTest {
   @Test public void testAnonymousSignature() { doTest("pkg/TestAnonymousSignature"); }
   @Test public void testLocalsSignature() { doTest("pkg/TestLocalsSignature"); }
   @Test public void testParameterizedTypes() { doTest("pkg/TestParameterizedTypes"); }
-  @Test public void testShadowing() { doTest("pkg/TestShadowing", "pkg/Shadow", "ext/Shadow",
-           "pkg/TestShadowingSuperClass"); }
+  @Test public void testShadowing() { doTest("pkg/TestShadowing", "pkg/Shadow", "ext/Shadow", "pkg/TestShadowingSuperClass"); }
   @Test public void testStringConcat() { doTest("pkg/TestStringConcat"); }
   @Test public void testJava9StringConcat() { doTest("java9/TestJava9StringConcat"); }
+  @Test public void testJava9ModuleInfo() { doTest("java9/module-info"); }
   @Test public void testJava11StringConcat() { doTest("java11/TestJava11StringConcat"); }
   @Test public void testMethodReferenceSameName() { doTest("pkg/TestMethodReferenceSameName"); }
   @Test public void testMethodReferenceLetterClass() { doTest("pkg/TestMethodReferenceLetterClass"); }
@@ -110,13 +119,14 @@ public class SingleClassesTest {
   @Test public void testMissingConstructorCallGood() { doTest("pkg/TestMissingConstructorCallGood"); }
   @Test public void testMissingConstructorCallBad() { doTest("pkg/TestMissingConstructorCallBad"); }
   @Test public void testEmptyBlocks() { doTest("pkg/TestEmptyBlocks"); }
+  @Test public void testInvertedFloatComparison() { doTest("pkg/TestInvertedFloatComparison"); }
   @Test public void testPrivateEmptyConstructor() { doTest("pkg/TestPrivateEmptyConstructor"); }
   @Test public void testSynchronizedUnprotected() { doTest("pkg/TestSynchronizedUnprotected"); }
   @Test public void testInterfaceSuper() { doTest("pkg/TestInterfaceSuper"); }
   @Test public void testFieldSingleAccess() { doTest("pkg/TestFieldSingleAccess"); }
+  @Test public void testPackageInfo() { doTest("pkg/package-info"); }
 
   // TODO: fix all below
-  //@Test public void testPackageInfo() { doTest("pkg/package-info"); }
   //@Test public void testSwitchOnStrings() { doTest("pkg/TestSwitchOnStrings");}
   //@Test public void testUnionType() { doTest("pkg/TestUnionType"); }
   //@Test public void testInnerClassConstructor2() { doTest("pkg/TestInner2"); }
@@ -128,6 +138,13 @@ public class SingleClassesTest {
   @Test public void testSuspendLambda() { doTest("pkg/TestSuspendLambdaKt"); }
   @Test public void testNamedSuspendFun2Kt() { doTest("pkg/TestNamedSuspendFun2Kt"); }
   @Test public void testGenericArgs() { doTest("pkg/TestGenericArgs"); }
+  @Test public void testRecordEmpty() { doTest("records/TestRecordEmpty"); }
+  @Test public void testRecordSimple() { doTest("records/TestRecordSimple"); }
+  @Test public void testRecordVararg() { doTest("records/TestRecordVararg"); }
+  @Test public void testRecordGenericVararg() { doTest("records/TestRecordGenericVararg"); }
+  @Test public void testRecordAnno() { doTest("records/TestRecordAnno"); }
+
+  @Test public void testInheritanceChainCycle() { doTest("pkg/TestInheritanceChainCycle"); }
 
   private void doTest(String testFile, String... companionFiles) {
     ConsoleDecompiler decompiler = fixture.getDecompiler();

testData/results/TestInheritanceChainCycle.dec

@@ -0,0 +1,22 @@
+package pkg;
+
+public class TestInheritanceChainCycle extends TestInheritanceChainCycle {
+   public void printMessage() {
+      System.out.println("Hello, bug!");// 21 22 23
+   }// 24
+}
+
+class 'pkg/TestInheritanceChainCycle' {
+   method 'printMessage ()V' {
+      0      4
+      3      4
+      5      4
+      8      5
+   }
+}
+
+Lines mapping:
+21 <-> 5
+22 <-> 5
+23 <-> 5
+24 <-> 6

testData/results/TestInvertedFloatComparison.dec

@@ -0,0 +1,167 @@
+package pkg;
+
+public class TestInvertedFloatComparison {
+   public boolean less(double var1, double var3) {
+      return var1 < var3;// 6
+   }
+
+   public boolean less(int var1, int var2) {
+      return var1 < var2;// 10
+   }
+
+   public boolean notLess(double var1, double var3) {
+      return !(var1 < var3);// 14
+   }
+
+   public boolean notLess(int var1, int var2) {
+      return var1 >= var2;// 18
+   }
+
+   public boolean greater(double var1, double var3) {
+      return var1 > var3;// 22
+   }
+
+   public boolean greater(int var1, int var2) {
+      return var1 > var2;// 26
+   }
+
+   public boolean notGreater(double var1, double var3) {
+      return !(var1 > var3);// 30
+   }
+
+   public boolean notGreater(int var1, int var2) {
+      return var1 <= var2;// 34
+   }
+
+   public boolean lessEqual(double var1, double var3) {
+      return var1 <= var3;// 38
+   }
+
+   public boolean lessEqual(int var1, int var2) {
+      return var1 <= var2;// 42
+   }
+
+   public boolean notLessEqual(double var1, double var3) {
+      return !(var1 <= var3);// 46
+   }
+
+   public boolean notLessEqual(int var1, int var2) {
+      return var1 > var2;// 50
+   }
+
+   public boolean greaterEqual(double var1, double var3) {
+      return var1 >= var3;// 54
+   }
+
+   public boolean greaterEqual(int var1, int var2) {
+      return var1 >= var2;// 58
+   }
+
+   public boolean notGreaterEqual(double var1, double var3) {
+      return !(var1 >= var3);// 62
+   }
+
+   public boolean notGreaterEqual(int var1, int var2) {
+      return var1 < var2;// 66
+   }
+}
+
+class 'pkg/TestInvertedFloatComparison' {
+   method 'less (DD)Z' {
+      2      4
+      b      4
+   }
+
+   method 'less (II)Z' {
+      2      8
+      a      8
+   }
+
+   method 'notLess (DD)Z' {
+      2      12
+      b      12
+   }
+
+   method 'notLess (II)Z' {
+      2      16
+      a      16
+   }
+
+   method 'greater (DD)Z' {
+      2      20
+      b      20
+   }
+
+   method 'greater (II)Z' {
+      2      24
+      a      24
+   }
+
+   method 'notGreater (DD)Z' {
+      2      28
+      b      28
+   }
+
+   method 'notGreater (II)Z' {
+      2      32
+      a      32
+   }
+
+   method 'lessEqual (DD)Z' {
+      2      36
+      b      36
+   }
+
+   method 'lessEqual (II)Z' {
+      2      40
+      a      40
+   }
+
+   method 'notLessEqual (DD)Z' {
+      2      44
+      b      44
+   }
+
+   method 'notLessEqual (II)Z' {
+      2      48
+      a      48
+   }
+
+   method 'greaterEqual (DD)Z' {
+      2      52
+      b      52
+   }
+
+   method 'greaterEqual (II)Z' {
+      2      56
+      a      56
+   }
+
+   method 'notGreaterEqual (DD)Z' {
+      2      60
+      b      60
+   }
+
+   method 'notGreaterEqual (II)Z' {
+      2      64
+      a      64
+   }
+}
+
+Lines mapping:
+6 <-> 5
+10 <-> 9
+14 <-> 13
+18 <-> 17
+22 <-> 21
+26 <-> 25
+30 <-> 29
+34 <-> 33
+38 <-> 37
+42 <-> 41
+46 <-> 45
+50 <-> 49
+54 <-> 53
+58 <-> 57
+62 <-> 61
+66 <-> 65

testData/results/TestRecordAnno.dec

@@ -0,0 +1,39 @@
+package records;
+
+public record TestRecordAnno(@RC @TA int x, int y) {
+   public TestRecordAnno(@TA int x, @P int y) {
+      this.x = x;
+      this.y = y;
+   }
+
+   @TA
+   public int x() {
+      return this.x;
+   }
+
+   @M
+   public int y() {
+      return this.y;// 5
+   }
+}
+
+class 'records/TestRecordAnno' {
+   method '<init> (II)V' {
+      6      4
+      b      5
+      e      6
+   }
+
+   method 'x ()I' {
+      1      10
+      4      10
+   }
+
+   method 'y ()I' {
+      1      15
+      4      15
+   }
+}
+
+Lines mapping:
+5 <-> 16

testData/results/TestRecordEmpty.dec

@@ -0,0 +1,17 @@
+package records;
+
+public record TestRecordEmpty() {
+   public int hashCode() {
+      return 0;// 5
+   }
+}
+
+class 'records/TestRecordEmpty' {
+   method 'hashCode ()I' {
+      0      4
+      1      4
+   }
+}
+
+Lines mapping:
+5 <-> 5

testData/results/TestRecordGenericVararg.dec

@@ -0,0 +1,39 @@
+package records;
+
+public record TestRecordGenericVararg<T>(T first, T... other) {
+   @SafeVarargs
+   public TestRecordGenericVararg(T first, T... other) {
+      this.first = first;// 5
+      this.other = other;
+   }
+
+   public T first() {
+      return this.first;
+   }
+
+   public T[] other() {
+      return this.other;// 3
+   }
+}
+
+class 'records/TestRecordGenericVararg' {
+   method '<init> (Ljava/lang/Object;[Ljava/lang/Object;)V' {
+      6      5
+      b      6
+      e      7
+   }
+
+   method 'first ()Ljava/lang/Object;' {
+      1      10
+      4      10
+   }
+
+   method 'other ()[Ljava/lang/Object;' {
+      1      14
+      4      14
+   }
+}
+
+Lines mapping:
+3 <-> 15
+5 <-> 6

testData/results/TestRecordSimple.dec

@@ -0,0 +1,37 @@
+package records;
+
+public record TestRecordSimple(int x, int y) {
+   public TestRecordSimple(int x, int y) {
+      this.x = x;
+      this.y = y;
+   }
+
+   public int x() {
+      return this.x;
+   }
+
+   public int y() {
+      return this.y;// 3
+   }
+}
+
+class 'records/TestRecordSimple' {
+   method '<init> (II)V' {
+      6      4
+      b      5
+      e      6
+   }
+
+   method 'x ()I' {
+      1      9
+      4      9
+   }
+
+   method 'y ()I' {
+      1      13
+      4      13
+   }
+}
+
+Lines mapping:
+3 <-> 14

testData/results/TestRecordVararg.dec

@@ -0,0 +1,37 @@
+package records;
+
+public record TestRecordVararg(int x, int[]... y) {
+   public TestRecordVararg(int x, int[]... y) {
+      this.x = x;
+      this.y = y;
+   }
+
+   public int x() {
+      return this.x;
+   }
+
+   public int[][] y() {
+      return this.y;// 3
+   }
+}
+
+class 'records/TestRecordVararg' {
+   method '<init> (I[[I)V' {
+      6      4
+      b      5
+      e      6
+   }
+
+   method 'x ()I' {
+      1      9
+      4      9
+   }
+
+   method 'y ()[[I' {
+      1      13
+      4      13
+   }
+}
+
+Lines mapping:
+3 <-> 14

testData/results/module-info.dec

@@ -0,0 +1,19 @@
+import sample.pkg1.TestModuleAnno;
+
+@TestModuleAnno("...")
+module sample.module {
+   requires java.desktop;
+
+   exports sample.pkg1;
+   exports sample.pkg2 to
+      java.base;
+
+   opens sample.pkg1;
+   opens sample.pkg2 to
+      java.base;
+
+   uses java.util.spi.ToolProvider;
+
+   provides sample.pkg1.TestService with
+      sample.pkg1.TestServiceImpl;
+}

testData/results/package-info.dec

@@ -1,2 +1,4 @@
-@jdk.Exported
+@PkgAnno("...")
 package pkg;
+
+import ext.PkgAnno;

testData/src/ext/PkgAnno.java

@@ -0,0 +1,8 @@
+package ext;
+
+import java.lang.annotation.*;
+
+@Target(ElementType.PACKAGE)
+public @interface PkgAnno {
+  String value();
+}

testData/src/java9/sample.module/TestClass.java

@@ -0,0 +1,3 @@
+package sample.pkg2;
+
+public class TestClass {}

testData/src/java9/sample.module/TestModuleAnno.java

@@ -0,0 +1,8 @@
+package sample.pkg1;
+
+import java.lang.annotation.*;
+
+@Target(ElementType.MODULE)
+public @interface TestModuleAnno {
+  String value();
+}