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/*
* Copyright 2018, Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.android.tools.smali.dexlib2.dexbacked.reference;
import com.android.tools.smali.dexlib2.ValueType;
import com.android.tools.smali.util.ExceptionWithContext;
import com.android.tools.smali.dexlib2.base.reference.BaseCallSiteReference;
import com.android.tools.smali.dexlib2.dexbacked.DexBackedDexFile;
import com.android.tools.smali.dexlib2.dexbacked.util.EncodedArrayItemIterator;
import com.android.tools.smali.dexlib2.iface.reference.MethodHandleReference;
import com.android.tools.smali.dexlib2.iface.reference.MethodProtoReference;
import com.android.tools.smali.dexlib2.iface.value.EncodedValue;
import com.android.tools.smali.dexlib2.iface.value.MethodHandleEncodedValue;
import com.android.tools.smali.dexlib2.iface.value.MethodTypeEncodedValue;
import com.android.tools.smali.dexlib2.iface.value.StringEncodedValue;
import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.List;
public class DexBackedCallSiteReference extends BaseCallSiteReference {
@Nonnull public final DexBackedDexFile dexFile;
public final int callSiteIndex;
public final int callSiteIdOffset;
private int callSiteOffset = -1;
public DexBackedCallSiteReference(DexBackedDexFile dexFile, int callSiteIndex) {
this.dexFile = dexFile;
this.callSiteIndex = callSiteIndex;
this.callSiteIdOffset = dexFile.getCallSiteSection().getOffset(callSiteIndex);
}
@Nonnull
@Override
public String getName() {
return String.format("call_site_%d", callSiteIndex);
}
@Nonnull
@Override
public MethodHandleReference getMethodHandle() {
EncodedArrayItemIterator iter = getCallSiteIterator();
if (iter.getItemCount() < 3) {
throw new ExceptionWithContext("Invalid call site item: must contain at least 3 entries.");
}
EncodedValue encodedValue = getCallSiteIterator().getNextOrNull();
assert encodedValue != null;
if (encodedValue.getValueType() != ValueType.METHOD_HANDLE) {
throw new ExceptionWithContext(
"Invalid encoded value type (%d) for the first item in call site %d",
encodedValue.getValueType(), callSiteIndex);
}
return ((MethodHandleEncodedValue) encodedValue).getValue();
}
@Nonnull
@Override
public String getMethodName() {
EncodedArrayItemIterator iter = getCallSiteIterator();
if (iter.getItemCount() < 3) {
throw new ExceptionWithContext("Invalid call site item: must contain at least 3 entries.");
}
iter.skipNext();
EncodedValue encodedValue = iter.getNextOrNull();
assert encodedValue != null;
if (encodedValue.getValueType() != ValueType.STRING) {
throw new ExceptionWithContext(
"Invalid encoded value type (%d) for the second item in call site %d",
encodedValue.getValueType(), callSiteIndex);
}
return ((StringEncodedValue) encodedValue).getValue();
}
@Nonnull
@Override
public MethodProtoReference getMethodProto() {
EncodedArrayItemIterator iter = getCallSiteIterator();
if (iter.getItemCount() < 3) {
throw new ExceptionWithContext("Invalid call site item: must contain at least 3 entries.");
}
iter.skipNext();
iter.skipNext();
EncodedValue encodedValue = iter.getNextOrNull();
assert encodedValue != null;
if (encodedValue.getValueType() != ValueType.METHOD_TYPE) {
throw new ExceptionWithContext(
"Invalid encoded value type (%d) for the second item in call site %d",
encodedValue.getValueType(), callSiteIndex);
}
return ((MethodTypeEncodedValue) encodedValue).getValue();
}
@Nonnull
@Override
public List<? extends EncodedValue> getExtraArguments() {
List<EncodedValue> values = new ArrayList<>();
EncodedArrayItemIterator iter = getCallSiteIterator();
if (iter.getItemCount() < 3) {
throw new ExceptionWithContext("Invalid call site item: must contain at least 3 entries.");
}
if (iter.getItemCount() == 3) {
return values;
}
iter.skipNext();
iter.skipNext();
iter.skipNext();
EncodedValue item = iter.getNextOrNull();
while (item != null) {
values.add(item);
item = iter.getNextOrNull();
}
return values;
}
private EncodedArrayItemIterator getCallSiteIterator() {
return EncodedArrayItemIterator.newOrEmpty(dexFile, getCallSiteOffset());
}
private int getCallSiteOffset() {
if (callSiteOffset < 0) {
callSiteOffset = dexFile.getBuffer().readSmallUint(callSiteIdOffset);
}
return callSiteOffset;
}
@Override
public void validateReference() throws InvalidReferenceException {
if (callSiteIndex < 0 || callSiteIndex >= dexFile.getCallSiteSection().size()) {
throw new InvalidReferenceException("callsite@" + callSiteIndex);
}
}
}
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