From e3f452250e51b7271f3989c7dfd12e4422934942 Mon Sep 17 00:00:00 2001
From: Michael Smith
Date: Thu, 21 May 2015 23:30:00 +0100
Subject: Support Gradle alongside SSJB

This makes builds faster, simpler and better automated but still keeps
Cuchaz happy. :)
---
 src/cuchaz/enigma/bytecode/ClassTranslator.java | 157 ++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 src/cuchaz/enigma/bytecode/ClassTranslator.java

(limited to 'src/cuchaz/enigma/bytecode/ClassTranslator.java')

diff --git a/src/cuchaz/enigma/bytecode/ClassTranslator.java b/src/cuchaz/enigma/bytecode/ClassTranslator.java
new file mode 100644
index 0000000..7402459
--- /dev/null
+++ b/src/cuchaz/enigma/bytecode/ClassTranslator.java
@@ -0,0 +1,157 @@
+/*******************************************************************************
+ * Copyright (c) 2015 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Lesser General Public
+ * License v3.0 which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/lgpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.bytecode;
+
+import javassist.CtBehavior;
+import javassist.CtClass;
+import javassist.CtField;
+import javassist.CtMethod;
+import javassist.bytecode.ConstPool;
+import javassist.bytecode.Descriptor;
+import javassist.bytecode.EnclosingMethodAttribute;
+import javassist.bytecode.SourceFileAttribute;
+import cuchaz.enigma.mapping.BehaviorEntry;
+import cuchaz.enigma.mapping.ClassEntry;
+import cuchaz.enigma.mapping.EntryFactory;
+import cuchaz.enigma.mapping.FieldEntry;
+import cuchaz.enigma.mapping.Signature;
+import cuchaz.enigma.mapping.Translator;
+import cuchaz.enigma.mapping.Type;
+
+public class ClassTranslator {
+	
+	private Translator m_translator;
+	
+	public ClassTranslator(Translator translator) {
+		m_translator = translator;
+	}
+	
+	public void translate(CtClass c) {
+		
+		// NOTE: the order of these translations is very important
+		
+		// translate all the field and method references in the code by editing the constant pool
+		ConstPool constants = c.getClassFile().getConstPool();
+		ConstPoolEditor editor = new ConstPoolEditor(constants);
+		for (int i = 1; i < constants.getSize(); i++) {
+			switch (constants.getTag(i)) {
+				
+				case ConstPool.CONST_Fieldref: {
+					
+					// translate the name and type
+					FieldEntry entry = EntryFactory.getFieldEntry(
+						Descriptor.toJvmName(constants.getFieldrefClassName(i)),
+						constants.getFieldrefName(i),
+						constants.getFieldrefType(i)
+					);
+					FieldEntry translatedEntry = m_translator.translateEntry(entry);
+					if (!entry.equals(translatedEntry)) {
+						editor.changeMemberrefNameAndType(i, translatedEntry.getName(), translatedEntry.getType().toString());
+					}
+				}
+				break;
+				
+				case ConstPool.CONST_Methodref:
+				case ConstPool.CONST_InterfaceMethodref: {
+					
+					// translate the name and type (ie signature)
+					BehaviorEntry entry = EntryFactory.getBehaviorEntry(
+						Descriptor.toJvmName(editor.getMemberrefClassname(i)),
+						editor.getMemberrefName(i),
+						editor.getMemberrefType(i)
+					);
+					BehaviorEntry translatedEntry = m_translator.translateEntry(entry);
+					if (!entry.equals(translatedEntry)) {
+						editor.changeMemberrefNameAndType(i, translatedEntry.getName(), translatedEntry.getSignature().toString());
+					}
+				}
+				break;
+			}
+		}
+		
+		ClassEntry classEntry = new ClassEntry(Descriptor.toJvmName(c.getName()));
+		
+		// translate all the fields
+		for (CtField field : c.getDeclaredFields()) {
+			
+			// translate the name
+			FieldEntry entry = EntryFactory.getFieldEntry(field);
+			String translatedName = m_translator.translate(entry);
+			if (translatedName != null) {
+				field.setName(translatedName);
+			}
+			
+			// translate the type
+			Type translatedType = m_translator.translateType(entry.getType());
+			field.getFieldInfo().setDescriptor(translatedType.toString());
+		}
+		
+		// translate all the methods and constructors
+		for (CtBehavior behavior : c.getDeclaredBehaviors()) {
+			
+			BehaviorEntry entry = EntryFactory.getBehaviorEntry(behavior);
+			
+			if (behavior instanceof CtMethod) {
+				CtMethod method = (CtMethod)behavior;
+				
+				// translate the name
+				String translatedName = m_translator.translate(entry);
+				if (translatedName != null) {
+					method.setName(translatedName);
+				}
+			}
+			
+			if (entry.getSignature() != null) {
+				// translate the signature
+				Signature translatedSignature = m_translator.translateSignature(entry.getSignature());
+				behavior.getMethodInfo().setDescriptor(translatedSignature.toString());
+			}
+		}
+		
+		// translate the EnclosingMethod attribute
+		EnclosingMethodAttribute enclosingMethodAttr = (EnclosingMethodAttribute)c.getClassFile().getAttribute(EnclosingMethodAttribute.tag);
+		if (enclosingMethodAttr != null) {
+			
+			if (enclosingMethodAttr.methodIndex() == 0) {
+				BehaviorEntry obfBehaviorEntry = EntryFactory.getBehaviorEntry(Descriptor.toJvmName(enclosingMethodAttr.className()));
+				BehaviorEntry deobfBehaviorEntry = m_translator.translateEntry(obfBehaviorEntry);
+				c.getClassFile().addAttribute(new EnclosingMethodAttribute(
+					constants,
+					deobfBehaviorEntry.getClassName()
+				));
+			} else {
+				BehaviorEntry obfBehaviorEntry = EntryFactory.getBehaviorEntry(
+					Descriptor.toJvmName(enclosingMethodAttr.className()),
+					enclosingMethodAttr.methodName(),
+					enclosingMethodAttr.methodDescriptor()
+				);
+				BehaviorEntry deobfBehaviorEntry = m_translator.translateEntry(obfBehaviorEntry);
+				c.getClassFile().addAttribute(new EnclosingMethodAttribute(
+					constants,
+					deobfBehaviorEntry.getClassName(),
+					deobfBehaviorEntry.getName(),
+					deobfBehaviorEntry.getSignature().toString()
+				));
+			}
+		}
+		
+		// translate all the class names referenced in the code
+		// the above code only changed method/field/reference names and types, but not the rest of the class references
+		ClassRenamer.renameClasses(c, m_translator);
+		
+		// translate the source file attribute too
+		ClassEntry deobfClassEntry = m_translator.translateEntry(classEntry);
+		if (deobfClassEntry != null) {
+			String sourceFile = Descriptor.toJvmName(deobfClassEntry.getOutermostClassEntry().getSimpleName()) + ".java";
+			c.getClassFile().addAttribute(new SourceFileAttribute(constants, sourceFile));
+		}
+	}
+}
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