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package com.oracle.truffle.llvm.runtime.pointer;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.llvm.runtime.interop.access.LLVMInteropType;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMTypes;

Represents a raw pointer to the native heap. Important: Java type checks or cast for the pointer interface types will not work because all interfaces are implemented by a single implementation class for efficiency reasons. Use the static methods isInstance and cast instead. All nodes that use specializations on pointer interfaces need to extend from LLVMNode, or at least use the LLVMTypes type system. /**
 * Represents a raw pointer to the native heap.
 *
 * Important: Java type checks or cast for the pointer interface types will not work because all
 * interfaces are implemented by a single implementation class for efficiency reasons. Use the
 * static methods {@link #isInstance} and {@link #cast} instead.
 *
 * All nodes that use specializations on pointer interfaces need to extend from {@link LLVMNode}, or
 * at least use the {@link LLVMTypes} type system.
 */
public interface LLVMNativePointer extends LLVMPointer {

    
Get the native address of this pointer.
/**
     * Get the native address of this pointer.
     */
    long asNative();

    @Override
    LLVMNativePointer copy();

    @Override
    @Deprecated
    @SuppressWarnings("deprecation")
    boolean equals(Object obj);

    
Increment this pointer. The result is determined by simply adding the offset to the asNative address. The export type of the result pointer is reset to null. /**
     * Increment this pointer. The result is determined by simply adding the offset to the
     * {@link #asNative} address.
     *
     * The {@link #getExportType export type} of the result pointer is reset to {@code null}.
     */
    @Override
    LLVMNativePointer increment(long offset);

    @Override
    LLVMNativePointer export(LLVMInteropType newType);

    
Create a null pointer.
/**
     * Create a null pointer.
     */
    static LLVMNativePointer createNull() {
        if (CompilerDirectives.inCompiledCode()) {
            return new LLVMPointerImpl(null, 0, null);
        } else {
            return LLVMPointerImpl.NULL;
        }
    }

    
Create a native pointer.
/**
     * Create a native pointer.
     */
    static LLVMNativePointer create(long ptr) {
        return new LLVMPointerImpl(null, ptr, null);
    }

    
Check whether an object is a LLVMNativePointer. This method must be used instead of the regular Java instanceof operator. /**
     * Check whether an object is a {@link LLVMNativePointer}. This method must be used instead of
     * the regular Java {@code instanceof} operator.
     */
    static boolean isInstance(Object object) {
        return object instanceof LLVMPointerImpl && ((LLVMPointerImpl) object).isNative();
    }

    
Cast an object to a LLVMNativePointer. This method must be used instead of the regular Java typecast operator. /**
     * Cast an object to a {@link LLVMNativePointer}. This method must be used instead of the
     * regular Java typecast operator.
     */
    static LLVMNativePointer cast(Object object) {
        assert isInstance(object);
        return (LLVMPointerImpl) object;
    }
}