Merge pull request #56 from BaseMC/upstreamupdate/github.com/fesh0r/f…

…ernflower/master

UpstreamUpdate from https://github.com/fesh0r/fernflower

build.gradle

@@ -13,8 +13,8 @@ sourceSets {
 
 repositories { mavenCentral() }
 dependencies {
-  testCompile 'junit:junit:4.13.2'
-  testCompile 'org.assertj:assertj-core:3.19.0'
+  testImplementation 'junit:junit:4.13.2'
+  testImplementation 'org.assertj:assertj-core:3.19.0'
 }
 
 jar {

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

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/main/collectors/ImportCollector.java

@@ -39,8 +39,10 @@ public ImportCollector(ClassNode root) {
 
     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 ImportCollector(ClassNode root) {
       }
 
       // .. 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());
     }
   }
 

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 @@ private void buildFilter(Integer id) {
           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) {

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

@@ -5,7 +5,9 @@
 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 @@
 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();
@@ -135,6 +144,8 @@ public void tearDown() {
   @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/src/pkg/TestInheritanceChainCycle.jasm

@@ -0,0 +1,27 @@
+/**
+ * This code can be assembled with <a href="https://wiki.openjdk.java.net/display/CodeTools/asmtools">asmtools</a>
+ * using <code>asmtools jasm -g *.jasm</code> command line.
+ */
+package  pkg;
+
+super public class TestInheritanceChainCycle
+	extends TestInheritanceChainCycle
+	version 52:0
+{
+  public Method "<init>":"()V"
+	stack 1 locals 1
+  {
+		aload_0;
+		invokespecial	Method java/lang/Object."<init>":"()V";
+		return;
+  }
+  public Method printMessage:"()V"
+	stack 2 locals 1
+  {
+		getstatic	Field java/lang/System.out:"Ljava/io/PrintStream;";
+		ldc	String "Hello, bug!";
+		invokevirtual	Method java/io/PrintStream.println:"(Ljava/lang/String;)V";
+		return;
+  }
+
+} // end Class TestInheritanceChainCycle