From e1960cc0b541cda93db94de5bef42dff922b9ec3 Mon Sep 17 00:00:00 2001
From: Deepanshu Gupta <deepanshu@google.com>
Date: Thu, 10 Jul 2014 13:20:42 -0700
Subject: [PATCH] LayoutLib: Fix System.arraycopy()

Framework has specialized versions of java.lang.System.arraycopy() for
all primitive data types. These versions are not present on the Desktop
VM. This change replaces calls to any of the specialized versions with
the more general alternative - the one using Objects.

Note that this was already being done for char.

Change-Id: If1584125fea8ecc080fb39a5ee6cdb4d922d0c98
---
 tools/layoutlib/create/README.txt             |  4 ++--
 .../tools/layoutlib/create/AsmAnalyzer.java   |  4 ++--
 .../create/ReplaceMethodCallsAdapter.java     | 23 +++++++++++++++----
 3 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/tools/layoutlib/create/README.txt b/tools/layoutlib/create/README.txt
index 32625ae86b588..2e83f35aa211a 100644
--- a/tools/layoutlib/create/README.txt
+++ b/tools/layoutlib/create/README.txt
@@ -131,8 +131,8 @@ valid StackMapTable. As a side benefit of this, we can continue to support Java
 Mac has horrible font rendering support.
 
 ReplaceMethodCallsAdapter replaces calls to certain methods. Currently, it only rewrites calls to
-java.lang.System.arraycopy([CI[CII)V, which is not part of the Desktop VM to call the more general
-method java.lang.System.arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V.
+specialized versions of java.lang.System.arraycopy(), which are not part of the Desktop VM to call
+the more general method java.lang.System.arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V.
 
 The ClassAdapters are chained together to achieve the desired output. (Look at section 2.2.7
 Transformation chains in the asm user guide, link in the References.) The order of execution of
diff --git a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java
index 8373e300f9b52..767e597bbd42d 100644
--- a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java
+++ b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/AsmAnalyzer.java
@@ -724,9 +724,9 @@ public class AsmAnalyzer {
                 considerDesc(desc);
 
 
-                // Check if method is java.lang.System.arrayCopy([CI[CII)V
+                // Check if method is a specialized version of java.lang.System.arrayCopy()
                 if (owner.equals("java/lang/System") && name.equals("arraycopy")
-                        && desc.equals("([CI[CII)V")) {
+                        && !desc.equals("(Ljava/lang/Object;ILjava/lang/Object;II)V")) {
                     mReplaceMethodCallClasses.add(mOwnerClass);
                 }
             }
diff --git a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/ReplaceMethodCallsAdapter.java b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/ReplaceMethodCallsAdapter.java
index e57eba107999e..ae174172bceb6 100644
--- a/tools/layoutlib/create/src/com/android/tools/layoutlib/create/ReplaceMethodCallsAdapter.java
+++ b/tools/layoutlib/create/src/com/android/tools/layoutlib/create/ReplaceMethodCallsAdapter.java
@@ -20,10 +20,23 @@ import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Opcodes;
 
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
 /**
  * Replaces calls to certain methods that do not exist in the Desktop VM.
  */
 public class ReplaceMethodCallsAdapter extends ClassVisitor {
+
+    /**
+     * Descriptors for specialized versions {@link System#arraycopy} that are not present on the
+     * Desktop VM.
+     */
+    private static Set<String> ARRAYCOPY_DESCRIPTORS = new HashSet<String>(Arrays.asList(
+            "([CI[CII)V", "([BI[BII)V", "([SI[SII)V", "([II[III)V",
+            "([JI[JII)V", "([FI[FII)V", "([DI[DII)V", "([ZI[ZII)V"));
+
     public ReplaceMethodCallsAdapter(ClassVisitor cv) {
         super(Opcodes.ASM4, cv);
     }
@@ -42,10 +55,12 @@ public class ReplaceMethodCallsAdapter extends ClassVisitor {
 
         @Override
         public void visitMethodInsn(int opcode, String owner, String name, String desc) {
-            // Check if method is java.lang.System.arrayCopy([CI[CII)V
-            if (owner.equals("java/lang/System") && name.equals("arraycopy")
-                    && desc.equals("([CI[CII)V")) {
-                desc = "(Ljava/lang/Object;ILjava/lang/Object;II)V";
+            // Check if method is a specialized version of java.lang.System.arrayCopy
+            if (owner.equals("java/lang/System") && name.equals("arraycopy")) {
+
+                if (ARRAYCOPY_DESCRIPTORS.contains(desc)) {
+                    desc = "(Ljava/lang/Object;ILjava/lang/Object;II)V";
+                }
             }
             super.visitMethodInsn(opcode, owner, name, desc);
         }