Examples with StackMapTableAttribute com.oracle.truffle.espresso.classfile.attributes.StackMapTableAttribute used on opensource projects

Example 1 with StackMapTableAttribute

use of com.oracle.truffle.espresso.classfile.attributes.StackMapTableAttribute in project graal by oracle.

the class ClassfileParser method parseCodeAttribute.

private CodeAttribute parseCodeAttribute(Symbol<Name> name) {
    int maxStack = stream.readU2();
    int maxLocals = stream.readU2();
    final int codeLength = stream.readS4();
    if (codeLength <= 0) {
        throw ConstantPool.classFormatError("code_length must be > than 0");
    } else if (codeLength > 0xFFFF) {
        throw ConstantPool.classFormatError("code_length > than 64 KB");
    }
    byte[] code;
    try (DebugCloseable codeRead = CODE_READ.scope(context.getTimers())) {
        code = stream.readByteArray(codeLength);
    }
    ExceptionHandler[] entries;
    try (DebugCloseable handlers = EXCEPTION_HANDLERS.scope(context.getTimers())) {
        entries = parseExceptionHandlerEntries();
    }
    int attributeCount = stream.readU2();
    final Attribute[] codeAttributes = spawnAttributesArray(attributeCount);
    int totalLocalTableCount = 0;
    CommonAttributeParser commonAttributeParser = new CommonAttributeParser(InfoType.Code);
    StackMapTableAttribute stackMapTable = null;
    for (int i = 0; i < attributeCount; i++) {
        final int attributeNameIndex = stream.readU2();
        final Symbol<Name> attributeName;
        attributeName = pool.symbolAt(attributeNameIndex, "attribute name");
        final int attributeSize = stream.readS4();
        final int startPosition = stream.getPosition();
        if (attributeName.equals(Name.LineNumberTable)) {
            codeAttributes[i] = parseLineNumberTable(attributeName);
        } else if (attributeName.equals(Name.LocalVariableTable)) {
            codeAttributes[i] = parseLocalVariableAttribute(attributeName, codeLength, maxLocals);
            totalLocalTableCount++;
        } else if (attributeName.equals(Name.LocalVariableTypeTable)) {
            codeAttributes[i] = parseLocalVariableTypeAttribute(attributeName, codeLength, maxLocals);
        } else if (attributeName.equals(Name.StackMapTable)) {
            if (stackMapTable != null) {
                throw ConstantPool.classFormatError("Duplicate StackMapTable attribute");
            }
            codeAttributes[i] = stackMapTable = parseStackMapTableAttribute(attributeName, attributeSize);
        } else {
            Attribute attr = commonAttributeParser.parseCommonAttribute(attributeName, attributeSize);
            // stream.skip(attributeSize);
            codeAttributes[i] = attr == null ? new Attribute(attributeName, stream.readByteArray(attributeSize)) : attr;
        }
        if (attributeSize != stream.getPosition() - startPosition) {
            throw ConstantPool.classFormatError("Invalid attribute length for " + attributeName + " attribute");
        }
    }
    if (totalLocalTableCount > 0) {
        validateLocalTables(codeAttributes);
    }
    return new CodeAttribute(name, maxStack, maxLocals, code, entries, codeAttributes, majorVersion);
}