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/*
* Copyright (C) 2010 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 dalvik.bytecode;
/**
* Information about Dalvik opcodes.
*/
public final class OpcodeInfo {
/**
* The maximum possible value of a Dalvik opcode.
*
* <p><b>Note:</b>: This is constant in any given VM incarnation,
* but it is subject to change over time, so it is not appropriate
* to represent as a compile-time constant value.</p>
*/
public static final int MAXIMUM_VALUE;
/**
* The maximum possible "packed value" of a Dalvik opcode. The
* packed value of an opcode is a denser representation that is
* only used when reporting usage statistics. The mapping between
* packed opcode values and regular opcode values is
* implementation-specific and may vary over time.
*
* <p><b>Note:</b>: This is constant in any given VM incarnation,
* but it is subject to change over time, so it is not appropriate
* to represent as a compile-time constant value.</p>
*
* @see dalvik.system.VMDebug.getInstructionCount()
*/
public static final int MAXIMUM_PACKED_VALUE;
static {
/*
* See note on the definition of MAXIMUM_VALUE, above, for
* why it's not assigned directly on the declaration line.
*
* IMPORTANT NOTE: This assignment is generated automatically
* by the opcode-gen tool. Any edits will get wiped out the
* next time the tool is run.
*/
// BEGIN(libcore-maximum-values); GENERATED AUTOMATICALLY BY opcode-gen
MAXIMUM_VALUE = 65535;
MAXIMUM_PACKED_VALUE = 255;
// END(libcore-maximum-values)
}
/**
* This class is not instantiable.
*/
private OpcodeInfo() {
// This space intentionally left blank.
}
/**
* Returns whether the given packed opcode value represents a
* method invocation operation. This includes most things that
* look like method invocation at the source level, but it notably
* excludes methods that are implemented directly in the VM as
* well as ones the VM knows to have empty implementations.
*
* @hide Unclear if this is useful enough to publish as supported API.
*
* @param opcode one of the values defined in {@link Opcodes}
*/
public static native boolean isInvoke(int packedOpcode);
}
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