// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Internal.Text;

namespace ILCompiler.DependencyAnalysis
{
    public class ModulesSectionNode : ObjectNode, ISymbolDefinitionNode, IUniqueSymbolNode
    {
        // Each compilation unit produces one module. When all compilation units are linked
        // together in multifile mode, the runtime needs to get list of modules present
        // in the final binary. This list is created via a special .modules section that
        // contains list of pointers to all module headers.
        //
        // These intentionally clash with one another, but are merged with linker directives so should not be COMDAT folded

        public override ObjectNodeSection GetSection(NodeFactory factory)
        {
            return factory.Target.IsWindows ?
                ObjectNodeSection.ModulesWindowsContentSection :
                ObjectNodeSection.ModulesUnixContentSection;
        }

        protected override string GetName(NodeFactory factory) => this.GetMangledName(factory.NameMangler);

        public override bool StaticDependenciesAreComputed => true;

        public void AppendMangledName(NameMangler nameMangler, Utf8StringBuilder sb)
        {
            sb.Append(nameMangler.CompilationUnitPrefix).Append("__Module"u8);
        }
        public int Offset => 0;
        public override bool IsShareable => false;

        public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
        {
            ObjectDataBuilder objData = new ObjectDataBuilder(factory, relocsOnly);
            objData.RequireInitialPointerAlignment();
            objData.AddSymbol(this);
            objData.EmitPointerReloc(factory.ReadyToRunHeader);

            return objData.ToObjectData();
        }

        public override int ClassCode => -1225116970;
    }
}