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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. 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.
// 3. Neither the name of the copyright holders 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 org.mvel2.asm;

/**
 * Information about a class being parsed in a {@link ClassReader}.
 *
 * @author Eric Bruneton
 */
final class Context {

    /** The prototypes of the attributes that must be parsed in this class. */
    Attribute[] attributePrototypes;

    /**
     * The options used to parse this class. One or more of {@link ClassReader#SKIP_CODE}, {@link
     * ClassReader#SKIP_DEBUG}, {@link ClassReader#SKIP_FRAMES}, {@link ClassReader#EXPAND_FRAMES} or
     * {@link ClassReader#EXPAND_ASM_INSNS}.
     */
    int parsingOptions;

    /** The buffer used to read strings in the constant pool. */
    char[] charBuffer;

    // Information about the current method, i.e. the one read in the current (or latest) call
    // to {@link ClassReader#readMethod()}.

    /** The access flags of the current method. */
    int currentMethodAccessFlags;

    /** The name of the current method. */
    String currentMethodName;

    /** The descriptor of the current method. */
    String currentMethodDescriptor;

    /**
     * The labels of the current method, indexed by bytecode offset (only bytecode offsets for which a
     * label is needed have a non null associated Label).
     */
    Label[] currentMethodLabels;

    // Information about the current type annotation target, i.e. the one read in the current
    // (or latest) call to {@link ClassReader#readAnnotationTarget()}.

    /**
     * The target_type and target_info of the current type annotation target, encoded as described in
     * {@link TypeReference}.
     */
    int currentTypeAnnotationTarget;

    /** The target_path of the current type annotation target. */
    TypePath currentTypeAnnotationTargetPath;

    /** The start of each local variable range in the current local variable annotation. */
    Label[] currentLocalVariableAnnotationRangeStarts;

    /** The end of each local variable range in the current local variable annotation. */
    Label[] currentLocalVariableAnnotationRangeEnds;

    /**
     * The local variable index of each local variable range in the current local variable annotation.
     */
    int[] currentLocalVariableAnnotationRangeIndices;

    // Information about the current stack map frame, i.e. the one read in the current (or latest)
    // call to {@link ClassReader#readFrame()}.

    /** The bytecode offset of the current stack map frame. */
    int currentFrameOffset;

    /**
     * The type of the current stack map frame. One of {@link Opcodes#F_FULL}, {@link
     * Opcodes#F_APPEND}, {@link Opcodes#F_CHOP}, {@link Opcodes#F_SAME} or {@link Opcodes#F_SAME1}.
     */
    int currentFrameType;

    /**
     * The number of local variable types in the current stack map frame. Each type is represented
     * with a single array element (even long and double).
     */
    int currentFrameLocalCount;

    /**
     * The delta number of local variable types in the current stack map frame (each type is
     * represented with a single array element - even long and double). This is the number of local
     * variable types in this frame, minus the number of local variable types in the previous frame.
     */
    int currentFrameLocalCountDelta;

    /**
     * The types of the local variables in the current stack map frame. Each type is represented with
     * a single array element (even long and double), using the format described in {@link
     * MethodVisitor#visitFrame}. Depending on {@link #currentFrameType}, this contains the types of
     * all the local variables, or only those of the additional ones (compared to the previous frame).
     */
    Object[] currentFrameLocalTypes;

    /**
     * The number stack element types in the current stack map frame. Each type is represented with a
     * single array element (even long and double).
     */
    int currentFrameStackCount;

    /**
     * The types of the stack elements in the current stack map frame. Each type is represented with a
     * single array element (even long and double), using the format described in {@link
     * MethodVisitor#visitFrame}.
     */
    Object[] currentFrameStackTypes;
}