...

compiler/Generator.cs

@@ -46,7 +46,9 @@ public class Generator
             if (!moduleGraph.TryResolveIdentifier(function.Module, function.Name.Ident, true, out var info))
                 throw new UnreachableException($"Module graph does not have info about the function {function.Module}::{function.Name.Ident}. This should have been caught earlier");
 
-            if (info.Kind == Module.DefinitionKind.Internal)
+            if (info.Source == Module.DefinitionSource.Imported || info.Extern)
+                writer.Write("extern ");
+            else if (info.Source == Module.DefinitionSource.Internal && !info.Extern && !info.Exported)
                 writer.Write("static ");
 
             var parameters = function.Parameters.Select(x => CType(x.Type, x.Name.Ident));
@@ -85,15 +87,10 @@ public class Generator
         {
             foreach (var (name, info) in module.GetIdentifiers())
             {
-                switch (info.Kind)
-                {
-                    case Module.DefinitionKind.External:
-                        writer.Write("extern ");
-                        break;
-                    case Module.DefinitionKind.Internal:
-                        writer.Write("static ");
-                        break;
-                }
+                if (info.Source == Module.DefinitionSource.Imported || info.Extern)
+                    writer.Write("extern ");
+                else if (info.Source == Module.DefinitionSource.Internal && !info.Extern && !info.Exported)
+                    writer.Write("static ");
 
                 if (info.Type is NubTypeFunc fn)
                     writer.WriteLine($"{CType(fn.ReturnType, info.MangledName)}({string.Join(", ", fn.Parameters.Select(p => CType(p)))});");
@@ -122,7 +119,7 @@ public class Generator
                 writer.WriteLine("{");
                 using (writer.Indent())
                 {
-                    writer.WriteLine("const char *data;");
+                    writer.WriteLine("char *data;");
                     writer.WriteLine("size_t length;");
                 }
                 writer.WriteLine("};");
@@ -366,7 +363,9 @@ public class Generator
             TypedNodeExpressionStringLiteral expression => $"({CType(expression.Type)}){{ \"{expression.Value.Value}\", {expression.Value.Value.Length} }}",
             TypedNodeExpressionStructLiteral expression => EmitExpressionStructLiteral(expression),
             TypedNodeExpressionEnumLiteral expression => EmitExpressionEnumLiteral(expression),
-            TypedNodeExpressionMemberAccess expression => EmitExpressionMemberAccess(expression),
+            TypedNodeExpressionStructMemberAccess expression => EmitExpressionMemberAccess(expression),
+            TypedNodeExpressionStringLength expression => EmitExpressionStringLength(expression),
+            TypedNodeExpressionStringPointer expression => EmitExpressionStringPointer(expression),
             TypedNodeExpressionLocalIdent expression => expression.Name,
             TypedNodeExpressionGlobalIdent expression => EmitNodeExpressionGlobalIdent(expression),
             TypedNodeExpressionFuncCall expression => EmitExpressionFuncCall(expression),
@@ -442,12 +441,24 @@ public class Generator
         return $"({CType(expression.Type)}){{ .tag = {tag}, .{enumVariantType.Variant} = {value} }}";
     }
 
-    private string EmitExpressionMemberAccess(TypedNodeExpressionMemberAccess expression)
+    private string EmitExpressionMemberAccess(TypedNodeExpressionStructMemberAccess expression)
     {
         var target = EmitExpression(expression.Target);
         return $"{target}.{expression.Name.Ident}";
     }
 
+    private string EmitExpressionStringLength(TypedNodeExpressionStringLength expression)
+    {
+        var target = EmitExpression(expression.Target);
+        return $"{target}.length";
+    }
+
+    private string EmitExpressionStringPointer(TypedNodeExpressionStringPointer expression)
+    {
+        var target = EmitExpression(expression.Target);
+        return $"{target}.data";
+    }
+
     private string EmitNodeExpressionGlobalIdent(TypedNodeExpressionGlobalIdent expression)
     {
         if (!moduleGraph.TryResolveIdentifier(expression.Module, expression.Name, true, out var info))

compiler/ModuleGraph.cs

@@ -86,16 +86,16 @@ public class ModuleGraph
                         {
                             case Manifest.Module.TypeInfoStruct s:
                             {
-                                var info = new Module.TypeInfoStruct(Module.DefinitionKind.External, s.Packed);
+                                var info = new Module.TypeInfoStruct(Module.DefinitionSource.Imported, s.Exported, s.Packed);
                                 var fields = s.Fields.Select(x => new Module.TypeInfoStruct.Field(x.Name, x.Type)).ToList();
                                 info.SetFields(fields);
                                 module.AddType(name, info);
                                 break;
                             }
-                            case Manifest.Module.TypeInfoEnum s:
+                            case Manifest.Module.TypeInfoEnum e:
                             {
-                                var info = new Module.TypeInfoEnum(Module.DefinitionKind.External);
-                                var variants = s.Variants.Select(v => new Module.TypeInfoEnum.Variant(v.Name, v.Type)).ToList();
+                                var info = new Module.TypeInfoEnum(Module.DefinitionSource.Imported, e.Exported);
+                                var variants = e.Variants.Select(v => new Module.TypeInfoEnum.Variant(v.Name, v.Type)).ToList();
                                 info.SetVariants(variants);
                                 module.AddType(name, info);
                                 break;
@@ -107,7 +107,7 @@ public class ModuleGraph
 
                     foreach (var (name, identifier) in manifestModule.Identifiers)
                     {
-                        module.AddIdentifier(name, new Module.IdentifierInfo(Module.DefinitionKind.External, identifier.Type, identifier.MangledName));
+                        module.AddIdentifier(name, new Module.IdentifierInfo(Module.DefinitionSource.Imported, identifier.Exported, identifier.Extern, identifier.Type, identifier.MangledName));
                     }
                 }
             }
@@ -118,14 +118,12 @@ public class ModuleGraph
 
                 foreach (var structDef in ast.Definitions.OfType<NodeDefinitionStruct>())
                 {
-                    var kind = structDef.Exported ? Module.DefinitionKind.Exported : Module.DefinitionKind.Internal;
-                    module.AddType(structDef.Name.Ident, new Module.TypeInfoStruct(kind, structDef.Packed));
+                    module.AddType(structDef.Name.Ident, new Module.TypeInfoStruct(Module.DefinitionSource.Internal, structDef.Exported, structDef.Packed));
                 }
 
                 foreach (var enumDef in ast.Definitions.OfType<NodeDefinitionEnum>())
                 {
-                    var kind = enumDef.Exported ? Module.DefinitionKind.Exported : Module.DefinitionKind.Internal;
-                    module.AddType(enumDef.Name.Ident, new Module.TypeInfoEnum(kind));
+                    module.AddType(enumDef.Name.Ident, new Module.TypeInfoEnum(Module.DefinitionSource.Internal, enumDef.Exported));
                 }
             }
 
@@ -165,18 +163,32 @@ public class ModuleGraph
                 foreach (var funcDef in ast.Definitions.OfType<NodeDefinitionFunc>())
                 {
                     var parameters = funcDef.Parameters.Select(x => ResolveType(x.Type, module.Name)).ToList();
-                    var returnType = ResolveType(funcDef.ReturnType, module.Name);
+                    var returnType = funcDef.ReturnType == null ? NubTypeVoid.Instance : ResolveType(funcDef.ReturnType, module.Name);
                     var funcType = NubTypeFunc.Get(parameters, returnType);
-                    var kind = funcDef.Exported ? Module.DefinitionKind.Exported : Module.DefinitionKind.Internal;
-                    var info = new Module.IdentifierInfo(kind, funcType, NameMangler.Mangle(module.Name, funcDef.Name.Ident, funcType));
+                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, funcDef.Exported, false, funcType, NameMangler.Mangle(module.Name, funcDef.Name.Ident, funcType));
+                    module.AddIdentifier(funcDef.Name.Ident, info);
+                }
+
+                foreach (var funcDef in ast.Definitions.OfType<NodeDefinitionExternFunc>())
+                {
+                    var parameters = funcDef.Parameters.Select(x => ResolveType(x.Type, module.Name)).ToList();
+                    var returnType = funcDef.ReturnType == null ? NubTypeVoid.Instance : ResolveType(funcDef.ReturnType, module.Name);
+                    var funcType = NubTypeFunc.Get(parameters, returnType);
+                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, funcDef.Exported, true, funcType, funcDef.Name.Ident);
                     module.AddIdentifier(funcDef.Name.Ident, info);
                 }
 
                 foreach (var globalVariable in ast.Definitions.OfType<NodeDefinitionGlobalVariable>())
                 {
                     var type = ResolveType(globalVariable.Type, module.Name);
-                    var kind = globalVariable.Exported ? Module.DefinitionKind.Exported : Module.DefinitionKind.Internal;
-                    var info = new Module.IdentifierInfo(kind, type, NameMangler.Mangle(module.Name, globalVariable.Name.Ident, type));
+                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, globalVariable.Exported, false, type, NameMangler.Mangle(module.Name, globalVariable.Name.Ident, type));
+                    module.AddIdentifier(globalVariable.Name.Ident, info);
+                }
+
+                foreach (var globalVariable in ast.Definitions.OfType<NodeDefinitionExternGlobalVariable>())
+                {
+                    var type = ResolveType(globalVariable.Type, module.Name);
+                    var info = new Module.IdentifierInfo(Module.DefinitionSource.Internal, globalVariable.Exported, true, type, NameMangler.Mangle(module.Name, globalVariable.Name.Ident, type));
                     module.AddIdentifier(globalVariable.Name.Ident, info);
                 }
             }
@@ -333,7 +345,7 @@ public class Module(string name)
             return false;
         }
 
-        if (searchPrivate || info.Kind is DefinitionKind.External or DefinitionKind.Exported)
+        if (searchPrivate || info.Source == DefinitionSource.Internal)
         {
             customType = info;
             return true;
@@ -352,7 +364,7 @@ public class Module(string name)
             return false;
         }
 
-        if (searchPrivate || info.Kind is DefinitionKind.External or DefinitionKind.Exported)
+        if (searchPrivate || info.Source == DefinitionSource.Internal)
         {
             identifierType = info;
             return true;
@@ -372,26 +384,28 @@ public class Module(string name)
         identifiers.Add(name, info);
     }
 
-    public enum DefinitionKind
+    public enum DefinitionSource
     {
         Internal,
-        Exported,
-        External,
+        Imported,
     }
 
-    public class IdentifierInfo(DefinitionKind kind, NubType type, string mangledName)
+    public class IdentifierInfo(DefinitionSource source, bool exported, bool @extern, NubType type, string mangledName)
     {
-        public DefinitionKind Kind { get; } = kind;
+        public DefinitionSource Source { get; } = source;
+        public bool Exported { get; } = exported;
+        public bool Extern { get; } = @extern;
         public NubType Type { get; } = type;
         public string MangledName { get; } = mangledName;
     }
 
-    public abstract class TypeInfo(DefinitionKind kind)
+    public abstract class TypeInfo(DefinitionSource source, bool exported)
     {
-        public DefinitionKind Kind { get; } = kind;
+        public DefinitionSource Source { get; } = source;
+        public bool Exported { get; } = exported;
     }
 
-    public class TypeInfoStruct(DefinitionKind kind, bool packed) : TypeInfo(kind)
+    public class TypeInfoStruct(DefinitionSource source, bool exported, bool packed) : TypeInfo(source, exported)
     {
         private IReadOnlyList<Field>? fields;
 
@@ -410,7 +424,7 @@ public class Module(string name)
         }
     }
 
-    public class TypeInfoEnum(DefinitionKind kind) : TypeInfo(kind)
+    public class TypeInfoEnum(DefinitionSource source, bool exported) : TypeInfo(source, exported)
     {
         private IReadOnlyList<Variant>? variants;
 

compiler/NubLib.cs

@@ -70,25 +70,8 @@ public record Manifest(Dictionary<string, Manifest.Module> Modules)
 
         foreach (var module in moduleGraph.GetModules())
         {
-            var types = new Dictionary<string, Module.TypeInfo>();
-            var identifiers = new Dictionary<string, Module.IdentifierInfo>();
-
-            foreach (var (name, typeInfo) in module.GetTypes())
-            {
-                if (typeInfo.Kind == Compiler.Module.DefinitionKind.Exported)
-                {
-                    types.Add(name, ConvertType(typeInfo));
-                }
-            }
-
-            foreach (var (name, identifierInfo) in module.GetIdentifiers())
-            {
-                if (identifierInfo.Kind == Compiler.Module.DefinitionKind.Exported)
-                {
-                    identifiers.Add(name, new Module.IdentifierInfo(identifierInfo.Type, identifierInfo.MangledName));
-                }
-            }
-
+            var types = module.GetTypes().ToDictionary(x => x.Key, x => ConvertType(x.Value));
+            var identifiers = module.GetIdentifiers().ToDictionary(x => x.Key, x => new Module.IdentifierInfo(x.Value.Type, x.Value.Exported, x.Value.Extern, x.Value.MangledName));
             modules[module.Name] = new Module(types, identifiers);
         }
 
@@ -98,8 +81,8 @@ public record Manifest(Dictionary<string, Manifest.Module> Modules)
         {
             return typeInfo switch
             {
-                Compiler.Module.TypeInfoStruct s => new Module.TypeInfoStruct(s.Packed, s.Fields.Select(x => new Module.TypeInfoStruct.Field(x.Name, x.Type)).ToList()),
-                Compiler.Module.TypeInfoEnum e => new Module.TypeInfoEnum(e.Variants.Select(v => new Module.TypeInfoEnum.Variant(v.Name, v.Type)).ToList()),
+                Compiler.Module.TypeInfoStruct s => new Module.TypeInfoStruct(s.Exported, s.Packed, s.Fields.Select(x => new Module.TypeInfoStruct.Field(x.Name, x.Type)).ToList()),
+                Compiler.Module.TypeInfoEnum e => new Module.TypeInfoEnum(e.Exported, e.Variants.Select(v => new Module.TypeInfoEnum.Variant(v.Name, v.Type)).ToList()),
                 _ => throw new ArgumentOutOfRangeException(nameof(typeInfo))
             };
         }
@@ -108,18 +91,18 @@ public record Manifest(Dictionary<string, Manifest.Module> Modules)
 
     public record Module(Dictionary<string, Module.TypeInfo> Types, Dictionary<string, Module.IdentifierInfo> Identifiers)
     {
-        public record IdentifierInfo(NubType Type, string MangledName);
+        public record IdentifierInfo(NubType Type, bool Exported, bool Extern, string MangledName);
 
         [JsonDerivedType(typeof(TypeInfoStruct), "struct")]
         [JsonDerivedType(typeof(TypeInfoEnum), "enum")]
-        public abstract record TypeInfo;
+        public abstract record TypeInfo(bool Exported);
 
-        public record TypeInfoStruct(bool Packed, IReadOnlyList<TypeInfoStruct.Field> Fields) : TypeInfo
+        public record TypeInfoStruct(bool Exported, bool Packed, IReadOnlyList<TypeInfoStruct.Field> Fields) : TypeInfo(Exported)
         {
             public record Field(string Name, NubType Type);
         }
 
-        public record TypeInfoEnum(IReadOnlyList<TypeInfoEnum.Variant> Variants) : TypeInfo
+        public record TypeInfoEnum(bool Exported, IReadOnlyList<TypeInfoEnum.Variant> Variants) : TypeInfo(Exported)
         {
             public record Variant(string Name, NubType Type);
         }

compiler/Parser.cs

@@ -65,6 +65,10 @@ public class Parser
                     Next();
                     modifiers[Keyword.Packed] = keyword;
                     break;
+                case Keyword.Extern:
+                    Next();
+                    modifiers[Keyword.Extern] = keyword;
+                    break;
                 default:
                     goto modifier_done;
             }
@@ -75,6 +79,7 @@ public class Parser
         if (TryExpectKeyword(Keyword.Func))
         {
             var exported = modifiers.Remove(Keyword.Export);
+            var @extern = modifiers.Remove(Keyword.Extern);
 
             foreach (var modifier in modifiers)
                 // todo(nub31): Add to diagnostics instead of throwing
@@ -93,12 +98,19 @@ public class Parser
                 parameters.Add(new NodeDefinitionFunc.Param(TokensFrom(paramStartIndex), parameterName, parameterType));
             }
 
-            ExpectSymbol(Symbol.Colon);
-            var returnType = ParseType();
+            NodeType? returnType = null;
+            if (TryExpectSymbol(Symbol.Colon))
+                returnType = ParseType();
 
-            var body = ParseStatement();
-
-            return new NodeDefinitionFunc(TokensFrom(startIndex), exported, name, parameters, body, returnType);
+            if (@extern)
+            {
+                return new NodeDefinitionExternFunc(TokensFrom(startIndex), exported, name, parameters, returnType);
+            }
+            else
+            {
+                var body = ParseStatement();
+                return new NodeDefinitionFunc(TokensFrom(startIndex), exported, name, parameters, body, returnType);
+            }
         }
 
         if (TryExpectKeyword(Keyword.Struct))
@@ -704,13 +716,21 @@ public abstract class Node(List<Token> tokens)
 
 public abstract class NodeDefinition(List<Token> tokens) : Node(tokens);
 
-public class NodeDefinitionFunc(List<Token> tokens, bool exported, TokenIdent name, List<NodeDefinitionFunc.Param> parameters, NodeStatement body, NodeType returnType) : NodeDefinition(tokens)
+public class NodeDefinitionExternFunc(List<Token> tokens, bool exported, TokenIdent name, List<NodeDefinitionFunc.Param> parameters, NodeType? returnType) : NodeDefinition(tokens)
+{
+    public bool Exported { get; } = exported;
+    public TokenIdent Name { get; } = name;
+    public List<NodeDefinitionFunc.Param> Parameters { get; } = parameters;
+    public NodeType? ReturnType { get; } = returnType;
+}
+
+public class NodeDefinitionFunc(List<Token> tokens, bool exported, TokenIdent name, List<NodeDefinitionFunc.Param> parameters, NodeStatement body, NodeType? returnType) : NodeDefinition(tokens)
 {
     public bool Exported { get; } = exported;
     public TokenIdent Name { get; } = name;
     public List<Param> Parameters { get; } = parameters;
     public NodeStatement Body { get; } = body;
-    public NodeType ReturnType { get; } = returnType;
+    public NodeType? ReturnType { get; } = returnType;
 
     public class Param(List<Token> tokens, TokenIdent name, NodeType type) : Node(tokens)
     {
@@ -746,6 +766,13 @@ public class NodeDefinitionEnum(List<Token> tokens, bool exported, TokenIdent na
     }
 }
 
+public class NodeDefinitionExternGlobalVariable(List<Token> tokens, bool exported, TokenIdent name, NodeType type) : NodeDefinition(tokens)
+{
+    public bool Exported { get; } = exported;
+    public TokenIdent Name { get; } = name;
+    public NodeType Type { get; } = type;
+}
+
 public class NodeDefinitionGlobalVariable(List<Token> tokens, bool exported, TokenIdent name, NodeType type) : NodeDefinition(tokens)
 {
     public bool Exported { get; } = exported;

compiler/Program.cs

@@ -133,13 +133,13 @@ File.WriteAllText(".build/out.c", output);
 
 if (compileLib)
 {
-    Process.Start("gcc", ["-Og", "-fvisibility=hidden", "-fno-builtin", "-c", "-o", ".build/out.o", ".build/out.c", .. archivePaths]).WaitForExit();
+    Process.Start("gcc", ["-Og", "-fno-builtin", "-c", "-o", ".build/out.o", ".build/out.c", .. archivePaths]).WaitForExit();
     Process.Start("ar", ["rcs", ".build/out.a", ".build/out.o"]).WaitForExit();
     NubLib.Pack(".build/out.nublib", ".build/out.a", Manifest.Create(moduleGraph));
 }
 else
 {
-    Process.Start("gcc", ["-Og", "-fvisibility=hidden", "-fno-builtin", "-o", ".build/out", ".build/out.c", .. archivePaths]).WaitForExit();
+    Process.Start("gcc", ["-Og", "-fno-builtin", "-o", ".build/out", ".build/out.c", .. archivePaths]).WaitForExit();
 }
 
 return 0;

compiler/Tokenizer.cs

@@ -397,6 +397,7 @@ public class Tokenizer
                         "return" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Return),
                         "module" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Module),
                         "export" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Export),
+                        "extern" => new TokenKeyword(line, startColumn, column - startColumn, Keyword.Extern),
                         "true" => new TokenBoolLiteral(line, startColumn, column - startColumn, true),
                         "false" => new TokenBoolLiteral(line, startColumn, column - startColumn, false),
                         _ => new TokenIdent(line, startColumn, column - startColumn, value)
@@ -545,6 +546,7 @@ public enum Keyword
     Return,
     Module,
     Export,
+    Extern,
 }
 
 public class TokenKeyword(int line, int column, int length, Keyword keyword) : Token(line, column, length)
@@ -611,6 +613,7 @@ public static class TokenExtensions
             Keyword.Return => "return",
             Keyword.Module => "module",
             Keyword.Export => "export",
+            Keyword.Extern => "extern",
             _ => throw new ArgumentOutOfRangeException(nameof(symbol), symbol, null)
         };
     }

compiler/TypeChecker.cs

@@ -34,14 +34,21 @@ public class TypeChecker
         var invalidParameter = false;
         TypedNodeStatement? body = null;
 
-        try
+        if (function.ReturnType == null)
         {
-            functionReturnType = ResolveType(function.ReturnType);
+            functionReturnType = NubTypeVoid.Instance;
         }
-        catch (CompileException e)
+        else
         {
-            diagnostics.Add(e.Diagnostic);
-            return null;
+            try
+            {
+                functionReturnType = ResolveType(function.ReturnType);
+            }
+            catch (CompileException e)
+            {
+                diagnostics.Add(e.Diagnostic);
+                return null;
+            }
         }
 
         using (scope.EnterScope())
@@ -119,20 +126,9 @@ public class TypeChecker
         if (statement.Expression is not NodeExpressionFuncCall funcCall)
             throw BasicError("Expected statement or function call", statement);
 
-        var target = CheckExpression(funcCall.Target, null);
-        if (target.Type is not NubTypeFunc funcType)
-            throw BasicError("Expected a function type", target);
+        var expr = CheckExpressionFuncCall(funcCall, null);
 
-        if (funcType.Parameters.Count != funcCall.Parameters.Count)
-            throw BasicError($"Expected {funcType.Parameters.Count} parameters but got {funcCall.Parameters.Count}", funcCall);
-
-        var parameters = new List<TypedNodeExpression>();
-        for (int i = 0; i < funcCall.Parameters.Count; i++)
-        {
-            parameters.Add(CheckExpression(funcCall.Parameters[i], funcType.Parameters[i]));
-        }
-
-        return new TypedNodeStatementFuncCall(statement.Tokens, target, parameters);
+        return new TypedNodeStatementFuncCall(expr.Tokens, expr.Target, expr.Parameters);
     }
 
     private TypedNodeStatementIf CheckStatementIf(NodeStatementIf statement)
@@ -406,15 +402,34 @@ public class TypeChecker
 
     private TypedNodeExpressionIntLiteral CheckExpressionIntLiteral(NodeExpressionIntLiteral expression, NubType? expectedType)
     {
-        return new TypedNodeExpressionIntLiteral(expression.Tokens, NubTypeSInt.Get(32), expression.Value);
+        NubType? type = null;
+
+        if (expectedType is NubTypeSInt or NubTypeUInt)
+            type = expectedType;
+
+        type ??= NubTypeSInt.Get(32);
+
+        return new TypedNodeExpressionIntLiteral(expression.Tokens, type, expression.Value);
     }
 
-    private TypedNodeExpressionMemberAccess CheckExpressionMemberAccess(NodeExpressionMemberAccess expression, NubType? expectedType)
+    private TypedNodeExpression CheckExpressionMemberAccess(NodeExpressionMemberAccess expression, NubType? expectedType)
     {
         var target = CheckExpression(expression.Target, null);
 
         switch (target.Type)
         {
+            case NubTypeString stringType:
+            {
+                switch (expression.Name.Ident)
+                {
+                    case "length":
+                        return new TypedNodeExpressionStringLength(expression.Tokens, NubTypeUInt.Get(64), target);
+                    case "ptr":
+                        return new TypedNodeExpressionStringPointer(expression.Tokens, NubTypePointer.Get(NubTypeUInt.Get(8)), target);
+                    default:
+                        throw BasicError($"'{expression.Name.Ident}' is not a member of type string", expression.Name);
+                }
+            }
             case NubTypeStruct structType:
             {
                 if (!moduleGraph.TryResolveModule(structType.Module, out var module))
@@ -430,24 +445,15 @@ public class TypeChecker
                 if (field == null)
                     throw BasicError($"Struct '{target.Type}' does not have a field matching the name '{expression.Name.Ident}'", target);
 
-                return new TypedNodeExpressionMemberAccess(expression.Tokens, field.Type, target, expression.Name);
+                return new TypedNodeExpressionStructMemberAccess(expression.Tokens, field.Type, target, expression.Name);
             }
-            case NubTypeEnumVariant enumVariantType:
+            case NubTypeAnonymousStruct anonymousStructType:
             {
-                if (!moduleGraph.TryResolveModule(enumVariantType.EnumType.Module, out var module))
-                    throw BasicError($"Module '{enumVariantType.EnumType.Module}' not found", expression.Target);
+                var field = anonymousStructType.Fields.FirstOrDefault(x => x.Name == expression.Name.Ident);
+                if (field == null)
+                    throw BasicError($"Struct '{target.Type}' does not have a field matching the name '{expression.Name.Ident}'", target);
 
-                if (!module.TryResolveType(enumVariantType.EnumType.Name, currentModule == enumVariantType.EnumType.Module, out var typeDef))
-                    throw BasicError($"Type '{enumVariantType.EnumType.Name}' not found in module '{enumVariantType.EnumType.Module}'", expression.Target);
-
-                if (typeDef is not Module.TypeInfoEnum enumDef)
-                    throw BasicError($"Type '{enumVariantType.EnumType.Module}::{enumVariantType.EnumType.Name}' is not an enum", expression.Target);
-
-                var variant = enumDef.Variants.FirstOrDefault(x => x.Name == enumVariantType.Variant);
-                if (variant == null)
-                    throw BasicError($"Type '{target.Type}' does not have a variant named '{enumVariantType.Variant}'", expression.Target);
-
-                return new TypedNodeExpressionMemberAccess(expression.Tokens, variant.Type, target, expression.Name);
+                return new TypedNodeExpressionStructMemberAccess(expression.Tokens, field.Type, target, expression.Name);
             }
             default:
                 throw BasicError($"{target.Type} has no member '{expression.Name.Ident}'", target);
@@ -466,7 +472,11 @@ public class TypeChecker
         var parameters = new List<TypedNodeExpression>();
         for (int i = 0; i < expression.Parameters.Count; i++)
         {
-            parameters.Add(CheckExpression(expression.Parameters[i], funcType.Parameters[i]));
+            var parameter = CheckExpression(expression.Parameters[i], funcType.Parameters[i]);
+            if (!parameter.Type.IsAssignableTo(funcType.Parameters[i]))
+                throw BasicError($"Parameter {i + 1} does is not assignable to '{funcType.Parameters[i]}'", parameter);
+
+            parameters.Add(parameter);
         }
 
         return new TypedNodeExpressionFuncCall(expression.Tokens, funcType.ReturnType, target, parameters);
@@ -531,7 +541,24 @@ public class TypeChecker
 
             return new TypedNodeExpressionStructLiteral(expression.Tokens, structType, initializers);
         }
-        // todo(nub31): Infer anonymous struct types if expectedType is anonymous struct
+        else if (expectedType is NubTypeAnonymousStruct anonymousStructType)
+        {
+            var initializers = new List<TypedNodeExpressionStructLiteral.Initializer>();
+            foreach (var initializer in expression.Initializers)
+            {
+                var field = anonymousStructType.Fields.FirstOrDefault(x => x.Name == initializer.Name.Ident);
+                if (field == null)
+                    throw BasicError($"Field '{initializer.Name.Ident}' does not exist on anonymous struct '{anonymousStructType}'", initializer.Name);
+
+                var value = CheckExpression(initializer.Value, field.Type);
+                if (!value.Type.IsAssignableTo(field.Type))
+                    throw BasicError($"Type of assignment ({value.Type}) does not match expected type of field '{field.Name}' ({field.Type})", initializer.Name);
+
+                initializers.Add(new TypedNodeExpressionStructLiteral.Initializer(initializer.Tokens, initializer.Name, value));
+            }
+
+            return new TypedNodeExpressionStructLiteral(expression.Tokens, anonymousStructType, initializers);
+        }
         else
         {
             var initializers = new List<TypedNodeExpressionStructLiteral.Initializer>();
@@ -849,12 +876,22 @@ public class TypedNodeExpressionEnumLiteral(List<Token> tokens, NubType type, Ty
     public TypedNodeExpression Value { get; } = value;
 }
 
-public class TypedNodeExpressionMemberAccess(List<Token> tokens, NubType type, TypedNodeExpression target, TokenIdent name) : TypedNodeExpression(tokens, type)
+public class TypedNodeExpressionStructMemberAccess(List<Token> tokens, NubType type, TypedNodeExpression target, TokenIdent name) : TypedNodeExpression(tokens, type)
 {
     public TypedNodeExpression Target { get; } = target;
     public TokenIdent Name { get; } = name;
 }
 
+public class TypedNodeExpressionStringLength(List<Token> tokens, NubType type, TypedNodeExpression target) : TypedNodeExpression(tokens, type)
+{
+    public TypedNodeExpression Target { get; } = target;
+}
+
+public class TypedNodeExpressionStringPointer(List<Token> tokens, NubType type, TypedNodeExpression target) : TypedNodeExpression(tokens, type)
+{
+    public TypedNodeExpression Target { get; } = target;
+}
+
 public class TypedNodeExpressionFuncCall(List<Token> tokens, NubType type, TypedNodeExpression target, List<TypedNodeExpression> parameters) : TypedNodeExpression(tokens, type)
 {
     public TypedNodeExpression Target { get; } = target;

examples/build.sh

@@ -1,12 +1,15 @@
 set -e
 
+pushd core
+dotnet run --project ../../compiler mem.nub print.nub --type=lib
+popd
+
 pushd math
 dotnet run --project ../../compiler math.nub --type=lib
-# pushd .build
-# unzip out.nublib
-# popd
 popd
 
 pushd program
-dotnet run --project ../../compiler main.nub ../math/.build/out.nublib
+dotnet run --project ../../compiler main.nub ../math/.build/out.nublib ../core/.build/out.nublib
 popd
+
+./program/.build/out

examples/core/mem.nub

@@ -0,0 +1,4 @@
+module core
+
+export extern func malloc(size: u64): ^void
+export extern func free(size: ^void)

examples/core/print.nub

@@ -0,0 +1,8 @@
+module core
+
+extern func puts(text: ^u8)
+
+export func print(text: string)
+{
+    puts(text.ptr)
+}

examples/program/main.nub

@@ -2,5 +2,8 @@ module main
 
 func main(): i32
 {
-    return math::add(1 2)
+    core::print("Hello, world")
+    let ptr = core::malloc(64)
+    core::free(ptr)
+    return 0
 }

examples/test/test.nub

@@ -1,32 +0,0 @@
-module main
-
-let global: i32
-
-func main(): i32 {
-    let x: i32 = 23
-    x = 24
-    
-    if !true {
-        x = 49
-        return x
-    } else {
-        x = 3
-    }
-    
-    let i: i32 = 0
-    
-    x = 1 + 2 * 34
-    while i < 10 {
-        i = i + 1
-        x = i
-    }
-    
-    let me: test::person = struct test::person { age = 21 name = "Oliver" }
-    
-    x = test::do_something(me.name)
-    test::do_something(me.name)
-
-    main::global = 123
-
-    return main::global
-}

examples/test/test2.nub

@@ -1,10 +0,0 @@
-module test
-
-export packed struct person {
-    age: i32
-    name: string
-}
-
-export func do_something(name: string): i32 {
-    return 3
-}