1 files changed, 105 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/VariableSizeUpdater.java b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/VariableSizeUpdater.java
new file mode 100644
index 0000000000..d88077ed94
--- /dev/null
+++ b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/VariableSizeUpdater.java
@@ -0,0 +1,105 @@
+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.classfile.editor;
+
+import proguard.classfile.*;
+import proguard.classfile.attribute.*;
+import proguard.classfile.attribute.visitor.AttributeVisitor;
+import proguard.classfile.instruction.*;
+import proguard.classfile.instruction.visitor.InstructionVisitor;
+import proguard.classfile.util.*;
+
+/**
+ * This AttributeVisitor computes and updates the maximum local variable frame
+ * size of the code attributes that it visits. It also cleans up the local
+ * variable tables.
+ *
+ * @author Eric Lafortune
+ */
+public class VariableSizeUpdater
+extends      SimplifiedVisitor
+implements   AttributeVisitor,
+             InstructionVisitor
+{
+    //*
+    private static final boolean DEBUG = false;
+    /*/
+    private static       boolean DEBUG = true;
+    //*/
+
+
+    private VariableCleaner variableCleaner = new VariableCleaner();
+
+
+    // Implementations for AttributeVisitor.
+
+    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
+
+
+    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
+    {
+//        DEBUG =
+//            clazz.getName().equals("abc/Def") &&
+//            method.getName(clazz).equals("abc");
+
+        // The minimum variable size is determined by the arguments.
+        codeAttribute.u2maxLocals =
+            ClassUtil.internalMethodParameterSize(method.getDescriptor(clazz),
+                                                  method.getAccessFlags());
+
+        if (DEBUG)
+        {
+            System.out.println("VariableSizeUpdater: "+clazz.getName()+"."+method.getName(clazz)+method.getDescriptor(clazz));
+            System.out.println("  Max locals: "+codeAttribute.u2maxLocals+" <- parameters");
+        }
+
+        // Go over all instructions.
+        codeAttribute.instructionsAccept(clazz, method, this);
+
+        // Remove the unused variables of the attributes.
+        variableCleaner.visitCodeAttribute(clazz, method, codeAttribute);
+    }
+
+
+    // Implementations for InstructionVisitor.
+
+    public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {}
+
+
+    public void visitVariableInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VariableInstruction variableInstruction)
+    {
+        int variableSize = variableInstruction.variableIndex + 1;
+        if (variableInstruction.isCategory2())
+        {
+            variableSize++;
+        }
+
+        if (codeAttribute.u2maxLocals < variableSize)
+        {
+            codeAttribute.u2maxLocals = variableSize;
+
+            if (DEBUG)
+            {
+                System.out.println("  Max locals: "+codeAttribute.u2maxLocals+" <- "+variableInstruction.toString(offset));
+            }
+        }
+    }
+}