Add several classes from dx tool to the dexgen project

[android-x86/dalvik.git] / dexgen / src / com / android / dexgen / rop / code / PlainInsn.java

diff --git a/dexgen/src/com/android/dexgen/rop/code/PlainInsn.java b/dexgen/src/com/android/dexgen/rop/code/PlainInsn.java
new file mode 100644 (file)
index 0000000..c79e7c1
--- /dev/null
+++ b/dexgen/src/com/android/dexgen/rop/code/PlainInsn.java
@@ -0,0 +1,140 @@
+/*
+ * 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.dexgen.rop.code;
+
+import com.android.dexgen.rop.cst.Constant;
+import com.android.dexgen.rop.type.StdTypeList;
+import com.android.dexgen.rop.type.Type;
+import com.android.dexgen.rop.type.TypeBearer;
+import com.android.dexgen.rop.type.TypeList;
+
+/**
+ * Plain instruction, which has no embedded data and which cannot possibly
+ * throw an exception.
+ */
+public final class PlainInsn
+        extends Insn {
+    /**
+     * Constructs an instance.
+     *
+     * @param opcode {@code non-null;} the opcode
+     * @param position {@code non-null;} source position
+     * @param result {@code null-ok;} spec for the result, if any
+     * @param sources {@code non-null;} specs for all the sources
+     */
+    public PlainInsn(Rop opcode, SourcePosition position,
+                     RegisterSpec result, RegisterSpecList sources) {
+        super(opcode, position, result, sources);
+
+        switch (opcode.getBranchingness()) {
+            case Rop.BRANCH_SWITCH:
+            case Rop.BRANCH_THROW: {
+                throw new IllegalArgumentException("bogus branchingness");
+            }
+        }
+
+        if (result != null && opcode.getBranchingness() != Rop.BRANCH_NONE) {
+            // move-result-pseudo is required here
+            throw new IllegalArgumentException
+                    ("can't mix branchingness with result");
+        }
+    }
+
+    /**
+     * Constructs a single-source instance.
+     *
+     * @param opcode {@code non-null;} the opcode
+     * @param position {@code non-null;} source position
+     * @param result {@code null-ok;} spec for the result, if any
+     * @param source {@code non-null;} spec for the source
+     */
+    public PlainInsn(Rop opcode, SourcePosition position, RegisterSpec result,
+                     RegisterSpec source) {
+        this(opcode, position, result, RegisterSpecList.make(source));
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public TypeList getCatches() {
+        return StdTypeList.EMPTY;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void accept(Visitor visitor) {
+        visitor.visitPlainInsn(this);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Insn withAddedCatch(Type type) {
+        throw new UnsupportedOperationException("unsupported");
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Insn withRegisterOffset(int delta) {
+        return new PlainInsn(getOpcode(), getPosition(),
+                             getResult().withOffset(delta),
+                             getSources().withOffset(delta));
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Insn withLastSourceLiteral() {
+        RegisterSpecList sources = getSources();
+        int szSources = sources.size();
+
+        if (szSources == 0) {
+            return this;
+        }
+
+        TypeBearer lastType = sources.get(szSources - 1).getTypeBearer();
+
+        if (!lastType.isConstant()) {
+            return this;
+        }
+
+        Constant cst = (Constant) lastType;
+
+        RegisterSpecList newSources = sources.withoutLast();
+
+        Rop newRop;
+        try {
+            newRop = Rops.ropFor(getOpcode().getOpcode(),
+                    getResult(), newSources, (Constant)lastType);
+        } catch (IllegalArgumentException ex) {
+            // There's no rop for this case
+            return this;
+        }
+
+        return new PlainCstInsn(newRop, getPosition(),
+                getResult(), newSources, cst);
+    }
+
+
+    /** {@inheritDoc} */
+    @Override
+    public Insn withNewRegisters(RegisterSpec result,
+            RegisterSpecList sources) {
+
+        return new PlainInsn(getOpcode(), getPosition(),
+                             result,
+                             sources);
+
+    }
+}