1 files changed, 211 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/dex/code/form/Form35c.java b/dx/src/com/android/dx/dex/code/form/Form35c.java
new file mode 100644
index 0000000..b9c12c6
--- /dev/null
+++ b/dx/src/com/android/dx/dex/code/form/Form35c.java
@@ -0,0 +1,211 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * 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
+ *
+ *      http://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.
+ */
+
+package com.android.dx.dex.code.form;
+
+import com.android.dx.dex.code.CstInsn;
+import com.android.dx.dex.code.DalvInsn;
+import com.android.dx.dex.code.InsnFormat;
+import com.android.dx.rop.code.RegisterSpec;
+import com.android.dx.rop.code.RegisterSpecList;
+import com.android.dx.rop.cst.Constant;
+import com.android.dx.rop.cst.CstMethodRef;
+import com.android.dx.rop.cst.CstType;
+import com.android.dx.rop.type.Type;
+import com.android.dx.util.AnnotatedOutput;
+
+import java.util.BitSet;
+
+/**
+ * Instruction format {@code 35c}. See the instruction format spec
+ * for details.
+ */
+public final class Form35c extends InsnFormat {
+    /** {@code non-null;} unique instance of this class */
+    public static final InsnFormat THE_ONE = new Form35c();
+
+    /** Maximal number of operands */
+    private static final int MAX_NUM_OPS = 5;
+
+    /**
+     * Constructs an instance. This class is not publicly
+     * instantiable. Use {@link #THE_ONE}.
+     */
+    private Form35c() {
+        // This space intentionally left blank.
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String insnArgString(DalvInsn insn) {
+        RegisterSpecList regs = explicitize(insn.getRegisters());
+        return regListString(regs) + ", " + cstString(insn);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String insnCommentString(DalvInsn insn, boolean noteIndices) {
+        if (noteIndices) {
+            return cstComment(insn);
+        } else {
+            return "";
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int codeSize() {
+        return 3;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean isCompatible(DalvInsn insn) {
+        if (!(insn instanceof CstInsn)) {
+            return false;
+        }
+
+        CstInsn ci = (CstInsn) insn;
+        int cpi = ci.getIndex();
+
+        if (! unsignedFitsInShort(cpi)) {
+            return false;
+        }
+
+        Constant cst = ci.getConstant();
+        if (!((cst instanceof CstMethodRef) ||
+              (cst instanceof CstType))) {
+            return false;
+        }
+
+        RegisterSpecList regs = ci.getRegisters();
+        return (wordCount(regs) >= 0);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public BitSet compatibleRegs(DalvInsn insn) {
+        RegisterSpecList regs = insn.getRegisters();
+        int sz = regs.size();
+        BitSet bits = new BitSet(sz);
+
+        for (int i = 0; i < sz; i++) {
+            RegisterSpec reg = regs.get(i);
+            /*
+             * The check below adds (category - 1) to the register, to
+             * account for the fact that the second half of a
+             * category-2 register has to be represented explicitly in
+             * the result.
+             */
+            bits.set(i, unsignedFitsInNibble(reg.getReg() +
+                                             reg.getCategory() - 1));
+        }
+
+        return bits;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void writeTo(AnnotatedOutput out, DalvInsn insn) {
+        int cpi = ((CstInsn) insn).getIndex();
+        RegisterSpecList regs = explicitize(insn.getRegisters());
+        int sz = regs.size();
+        int r0 = (sz > 0) ? regs.get(0).getReg() : 0;
+        int r1 = (sz > 1) ? regs.get(1).getReg() : 0;
+        int r2 = (sz > 2) ? regs.get(2).getReg() : 0;
+        int r3 = (sz > 3) ? regs.get(3).getReg() : 0;
+        int r4 = (sz > 4) ? regs.get(4).getReg() : 0;
+
+        write(out,
+              opcodeUnit(insn,
+                         makeByte(r4, sz)), // encode the fifth operand here
+              (short) cpi,
+              codeUnit(r0, r1, r2, r3));
+    }
+
+    /**
+     * Gets the number of words required for the given register list, where
+     * category-2 values count as two words. Return {@code -1} if the
+     * list requires more than five words or contains registers that need
+     * more than a nibble to identify them.
+     *
+     * @param regs {@code non-null;} the register list in question
+     * @return {@code >= -1;} the number of words required, or {@code -1}
+     * if the list couldn't possibly fit in this format
+     */
+    private static int wordCount(RegisterSpecList regs) {
+        int sz = regs.size();
+
+        if (sz > MAX_NUM_OPS) {
+            // It can't possibly fit.
+            return -1;
+        }
+
+        int result = 0;
+
+        for (int i = 0; i < sz; i++) {
+            RegisterSpec one = regs.get(i);
+            result += one.getCategory();
+            /*
+             * The check below adds (category - 1) to the register, to
+             * account for the fact that the second half of a
+             * category-2 register has to be represented explicitly in
+             * the result.
+             */
+            if (!unsignedFitsInNibble(one.getReg() + one.getCategory() - 1)) {
+                return -1;
+            }
+        }
+
+        return (result <= MAX_NUM_OPS) ? result : -1;
+    }
+
+    /**
+     * Returns a register list which is equivalent to the given one,
+     * except that it splits category-2 registers into two explicit
+     * entries. This returns the original list if no modification is
+     * required
+     *
+     * @param orig {@code non-null;} the original list
+     * @return {@code non-null;} the list with the described transformation
+     */
+    private static RegisterSpecList explicitize(RegisterSpecList orig) {
+        int wordCount = wordCount(orig);
+        int sz = orig.size();
+
+        if (wordCount == sz) {
+            return orig;
+        }
+
+        RegisterSpecList result = new RegisterSpecList(wordCount);
+        int wordAt = 0;
+
+        for (int i = 0; i < sz; i++) {
+            RegisterSpec one = orig.get(i);
+            result.set(wordAt, one);
+            if (one.getCategory() == 2) {
+                result.set(wordAt + 1,
+                           RegisterSpec.make(one.getReg() + 1, Type.VOID));
+                wordAt += 2;
+            } else {
+                wordAt++;
+            }
+        }
+
+        result.setImmutable();
+        return result;
+    }
+}