perhaps

compiler/Generator.cs

@@ -17,6 +17,106 @@ public class Generator
         this.entryPoint = entryPoint;
     }
 
+    const string NUB_H_CONTENTS =
+    """
+    #include <stdint.h>
+    #include <stdlib.h>
+    #include <string.h>
+
+    typedef struct
+    {
+        char *data;
+        size_t length;
+        size_t ref;
+        uint32_t flags;
+    } string;
+
+    typedef string *string_ptr;
+
+    #define FLAG_STRING_LITERAL 1
+
+    static inline void string_rc_inc(string_ptr str)
+    {
+        if (str == NULL)
+            return;
+
+        if (str->flags & FLAG_STRING_LITERAL)
+            return;
+
+        str->ref += 1;
+    }
+
+    static inline void string_rc_dec(string_ptr str)
+    {
+        if (str == NULL)
+            return;
+
+        if (str->flags & FLAG_STRING_LITERAL)
+            return;
+
+        if (str->ref == 0)
+            return;
+
+        str->ref -= 1;
+
+        if (str->ref == 0)
+        {
+            free(str->data);
+            free(str);
+        }
+    }
+
+    static inline string_ptr string_concat(string_ptr left, string_ptr right)
+    {
+        size_t new_length = left->length + right->length;
+
+        string_ptr result = (string_ptr)malloc(sizeof(string));
+        result->data = (char*)malloc(new_length + 1);
+
+        memcpy(result->data, left->data, left->length);
+        memcpy(result->data + left->length, right->data, right->length);
+
+        result->data[new_length] = '\0';
+        result->length = new_length;
+        result->ref = 1;
+        result->flags = 0;
+
+        return result;
+    }
+
+    static inline string_ptr string_from_cstr(char *cstr)
+    {
+        size_t len = strlen(cstr);
+
+        string_ptr result = (string_ptr)malloc(sizeof(string));
+        result->data = (char*)malloc(len + 1);
+
+        memcpy(result->data, cstr, len + 1);
+
+        result->length = len;
+        result->ref = 1;
+        result->flags = 0;
+
+        return result;
+    }
+
+    #define da_append(xs, x)                                                               \
+        do                                                                                 \
+        {                                                                                  \
+            if ((xs)->count >= (xs)->capacity)                                             \
+            {                                                                              \
+                if ((xs)->capacity == 0)                                                   \
+                    (xs)->capacity = 256;                                                  \
+                else                                                                       \
+                    (xs)->capacity *= 2;                                                   \
+                (xs)->items = realloc((xs)->items, (xs)->capacity * sizeof(*(xs)->items)); \
+            }                                                                              \
+                                                                                           \
+            (xs)->items[(xs)->count++] = (x);                                              \
+        } while (0)
+
+    """;
+
     private readonly List<TypedNodeDefinitionFunc> functions;
     private readonly ModuleGraph moduleGraph;
     private readonly string? entryPoint;
@@ -29,16 +129,18 @@ public class Generator
 
     private string Emit()
     {
+        var outPath = ".build";
+        var fileName = "out.c";
+
         if (entryPoint != null)
         {
-            writer.WriteLine($$"""
-                             int main(int argc, char *argv[])
-                             {
-                                return {{entryPoint}}();
-                             }
-
-                             """);
-
+            writer.WriteLine("int main(int argc, char *argv[])");
+            writer.WriteLine("{");
+            using (writer.Indent())
+            {
+                writer.WriteLine($"return {entryPoint}();");
+            }
+            writer.WriteLine("}");
             writer.WriteLine();
         }
 
@@ -47,9 +149,7 @@ 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.Source == Module.DefinitionSource.Imported || info.Extern)
-                writer.Write("extern ");
-            else if (info.Source == Module.DefinitionSource.Internal && !info.Extern && !info.Exported)
+            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));
@@ -66,7 +166,7 @@ public class Generator
             writer.WriteLine();
         }
 
-        var implementations = writer.ToString();
+        var definitions = writer.ToString();
 
         writer = new IndentedTextWriter();
 
@@ -85,163 +185,12 @@ public class Generator
                         writer.WriteLine($"{CType(fn.ReturnType, info.MangledName)}({string.Join(", ", fn.Parameters.Select(p => CType(p)))});");
                     else
                         writer.WriteLine($"{CType(info.Type, info.MangledName)};");
+
+                    writer.WriteLine();
                 }
             }
         }
 
-        var declarations = writer.ToString();
-
-        writer = new IndentedTextWriter();
-
-        writer.WriteLine("""
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-typedef struct
-{
-  char *data;
-  size_t length;
-  uint32_t ref;
-  uint32_t flags;
-} string;
-
-typedef uint8_t u8;
-typedef int8_t i8;
-
-typedef uint16_t u16;
-typedef int16_t i16;
-
-typedef uint32_t u32;
-typedef int32_t i32;
-
-typedef uint64_t u64;
-typedef int64_t i64;
-
-#define FLAG_STRING_LITERAL 1
-
-#define RC_DBG(fmt, ...) fprintf(stderr, "[RC] " fmt "\n", ##__VA_ARGS__)
-
-static size_t rc_allocs = 0;
-static size_t rc_frees = 0;
-
-__attribute__((destructor))
-static void string_debug_report(void)
-{
-  fprintf(stderr, "[RC] REPORT allocs=%zu frees=%zu leaks=%zu\n", rc_allocs, rc_frees, rc_allocs - rc_frees);
-}
-
-static inline void string_rc_inc(string *str)
-{
-  if (str == NULL)
-  {
-    RC_DBG("INC null string");
-    return;
-  }
-
-  if (str->flags & FLAG_STRING_LITERAL)
-    return;
-
-  str->ref += 1;
-
-  RC_DBG("INC: str=%p ref=%u \"%s\"", (void *)str, str->ref, str->data);
-}
-
-static inline void string_rc_dec(string *str)
-{
-  if (str == NULL)
-  {
-    RC_DBG("WRN: DEC null string");
-    return;
-  }
-
-  if (str->flags & FLAG_STRING_LITERAL)
-    return;
-
-  if (str->ref == 0)
-  {
-    RC_DBG("ERR: DEC on zero refcount str=%p", (void *)str);
-    return;
-  }
-
-  str->ref -= 1;
-
-  RC_DBG("DEC: str=%p ref=%u \"%s\"", (void *)str, str->ref, str->data);
-
-  if (str->ref == 0)
-  {
-    rc_frees++;
-    RC_DBG("FREE: str=%p data=%p \"%s\"", (void *)str, (void *)str->data, str->data);
-
-    free(str->data);
-    free(str);
-  }
-}
-
-static inline string *string_concat(string *left, string *right)
-{
-  size_t new_length = left->length + right->length;
-
-  string *result = (string *)malloc(sizeof(string));
-  result->data = (char *)malloc(new_length + 1);
-
-  memcpy(result->data, left->data, left->length);
-  memcpy(result->data + left->length, right->data, right->length);
-
-  result->data[new_length] = '\0';
-  result->length = new_length;
-  result->ref = 1;
-  result->flags = 0;
-
-  rc_allocs++;
-  RC_DBG("NEW string_concat: str=%p ref=%u \"%s\"", (void *)result, result->ref, result->data);
-
-  return result;
-}
-
-static inline string *string_from_cstr(char *cstr)
-{
-  size_t len = strlen(cstr);
-
-  string *result = (string *)malloc(sizeof(string));
-  result->data = (char *)malloc(len + 1);
-
-  memcpy(result->data, cstr, len + 1);
-
-  result->length = len;
-  result->ref = 1;
-  result->flags = 0;
-
-  rc_allocs++;
-  RC_DBG("NEW string_from_cstr: str=%p ref=%u \"%s\"", (void *)result, result->ref, result->data);
-
-  return result;
-}
-
-#define da_append(xs, x)                                                             \
-    do                                                                               \
-    {                                                                                \
-        if ((xs)->count >= (xs)->capacity)                                           \
-        {                                                                            \
-            if ((xs)->capacity == 0) (xs)->capacity = 256;                           \
-            else (xs)->capacity *= 2;                                                \
-            (xs)->items = realloc((xs)->items, (xs)->capacity*sizeof(*(xs)->items)); \
-        }                                                                            \
-                                                                                     \
-        (xs)->items[(xs)->count++] = (x);                                            \
-    }                                                                                \
-    while (0)
-
-""");
-
-        while (referencedTypes.Count != 0)
-        {
-            var type = referencedTypes.ElementAt(0);
-            EmitTypeDefinitionIfNotEmitted(type);
-            referencedTypes.Remove(type);
-        }
-
         foreach (var (name, value) in referencedStringLiterals)
         {
             writer.WriteLine
@@ -258,9 +207,35 @@ static inline string *string_from_cstr(char *cstr)
             );
         }
 
-        var header = writer.ToString();
+        var declarations = writer.ToString();
 
-        return $"{header}\n{declarations}\n{implementations}";
+        writer = new IndentedTextWriter();
+
+        while (referencedTypes.Count != 0)
+        {
+            var type = referencedTypes.ElementAt(0);
+            EmitTypeDefinitionIfNotEmitted(type);
+            referencedTypes.Remove(type);
+        }
+
+        var types = writer.ToString();
+
+        var sb = new StringBuilder();
+
+        sb.AppendLine("#include \"nub.h\"");
+        sb.AppendLine();
+        sb.AppendLine(types);
+        sb.AppendLine(declarations);
+        sb.AppendLine(definitions);
+
+        Directory.CreateDirectory(outPath);
+
+        var filePath = Path.Combine(outPath, fileName);
+
+        File.WriteAllText(Path.Combine(outPath, "nub.h"), NUB_H_CONTENTS);
+        File.WriteAllText(filePath, sb.ToString());
+
+        return filePath;
     }
 
     private void EmitTypeDefinitionIfNotEmitted(NubType type)
@@ -270,109 +245,10 @@ static inline string *string_from_cstr(char *cstr)
 
         emittedTypes.Add(type);
 
+        var name = TypeName(type);
+
         switch (type)
         {
-            case NubTypeArray arrayType:
-                {
-                    EmitTypeDefinitionIfNotEmitted(arrayType.ElementType);
-
-                    var name = typeNames[arrayType];
-
-                    writer.WriteLine("typedef struct");
-                    writer.WriteLine("{");
-                    using (writer.Indent())
-                    {
-                        writer.WriteLine("size_t count;");
-                        writer.WriteLine("size_t capacity;");
-                        writer.WriteLine($"{CType(arrayType.ElementType)} *items;");
-                        writer.WriteLine("uint32_t ref;");
-                    }
-                    writer.WriteLine($"}} {name};");
-                    writer.WriteLine();
-
-                    writer.WriteLine($$"""
-static inline void {{name}}_rc_inc({{name}} *array)
-{
-  if (array == NULL)
-  {
-    RC_DBG("WRN: INC null array");
-    return;
-  }
-
-  array->ref += 1;
-
-  RC_DBG("INC: array=%p ref=%u", (void *)array, array->ref);
-}
-
-""");
-
-                    writer.WriteLine($"static inline void {name}_rc_dec({name} *array)");
-                    writer.WriteLine("{");
-                    using (writer.Indent())
-                    {
-                        writer.WriteLine("if (array == NULL)");
-                        writer.WriteLine("{");
-                        using (writer.Indent())
-                        {
-                            writer.WriteLine("RC_DBG(\"WRN: DEC null array\");");
-                            writer.WriteLine("return;");
-                        }
-                        writer.WriteLine("}");
-                        writer.WriteLine();
-                        writer.WriteLine("if (array->ref == 0)");
-                        writer.WriteLine("{");
-                        using (writer.Indent())
-                        {
-                            writer.WriteLine("RC_DBG(\"ERR: DEC on zero refcount\");");
-                            writer.WriteLine("return;");
-                        }
-                        writer.WriteLine("}");
-                        writer.WriteLine();
-                        writer.WriteLine("array->ref -= 1;");
-                        writer.WriteLine();
-                        writer.WriteLine("RC_DBG(\"DEC: array=%p ref=%u\", (void*)array, array->ref);");
-                        writer.WriteLine();
-                        writer.WriteLine("if (array->ref == 0)");
-                        writer.WriteLine("{");
-                        using (writer.Indent())
-                        {
-                            writer.WriteLine("for (size_t i = 0; i < array->count; ++i)");
-                            writer.WriteLine("{");
-                            using (writer.Indent())
-                            {
-                                EmitCopyDestructor("array->items[i]", arrayType.ElementType);
-                            }
-                            writer.WriteLine("}");
-                            writer.WriteLine();
-                            writer.WriteLine("rc_frees++;");
-                            writer.WriteLine("RC_DBG(\"FREE: array=%p data=%p\", (void *)array, (void *)array->items);");
-                            writer.WriteLine();
-                            writer.WriteLine("free(array);");
-                        }
-                        writer.WriteLine("}");
-                    }
-                    writer.WriteLine("}");
-                    writer.WriteLine();
-
-                    writer.WriteLine($"static inline {name} *{name}_make()");
-                    writer.WriteLine("{");
-                    using (writer.Indent())
-                    {
-                        writer.WriteLine($"{name} *array = ({name} *)malloc(sizeof({name}));");
-                        writer.WriteLine("array->ref = 1;");
-                        writer.WriteLine("array->count = 0;");
-                        writer.WriteLine("array->capacity = 0;");
-                        writer.WriteLine("array->items = NULL;");
-                        writer.WriteLine();
-                        writer.WriteLine("rc_allocs++;");
-                        writer.WriteLine($"RC_DBG(\"NEW {name}_make: array=%p ref=%u\", (void *)array, array->ref);");
-                        writer.WriteLine("return array;");
-                    }
-                    writer.WriteLine("}");
-                    writer.WriteLine();
-
-                    break;
-                }
             case NubTypeStruct structType:
                 {
                     if (!moduleGraph.TryResolveType(structType.Module, structType.Name, true, out var info) || info is not Module.TypeInfoStruct structInfo)
@@ -393,7 +269,7 @@ static inline void {{name}}_rc_inc({{name}} *array)
                             writer.WriteLine($"{CType(field.Type, field.Name)};");
                         }
                     }
-                    writer.WriteLine($"}} {typeNames[structType]};");
+                    writer.WriteLine($"}} {name};");
                     writer.WriteLine();
 
                     break;
@@ -412,7 +288,7 @@ static inline void {{name}}_rc_inc({{name}} *array)
                             writer.WriteLine($"{CType(field.Type, field.Name)};");
                         }
                     }
-                    writer.WriteLine($"}} {typeNames[anonymousStructType]};");
+                    writer.WriteLine($"}} {name};");
                     writer.WriteLine();
 
                     break;
@@ -449,7 +325,7 @@ static inline void {{name}}_rc_inc({{name}} *array)
                         }
                         writer.WriteLine("};");
                     }
-                    writer.WriteLine($"}} {typeNames[enumType]};");
+                    writer.WriteLine($"}} {name};");
                     writer.WriteLine();
 
                     break;
@@ -457,6 +333,97 @@ static inline void {{name}}_rc_inc({{name}} *array)
             case NubTypeEnumVariant variantType:
                 {
                     EmitTypeDefinitionIfNotEmitted(variantType.EnumType);
+                    break;
+                }
+            case NubTypePointer pointerType:
+                {
+                    EmitTypeDefinitionIfNotEmitted(pointerType.To);
+                    writer.WriteLine($"typedef {TypeName(pointerType.To)} *{name};");
+                    break;
+                }
+            case NubTypeFunc funcType:
+                {
+                    EmitTypeDefinitionIfNotEmitted(funcType.ReturnType);
+                    foreach (var parameterType in funcType.Parameters)
+                        EmitTypeDefinitionIfNotEmitted(parameterType);
+
+                    writer.WriteLine($"typedef {TypeName(funcType.ReturnType)} (*)({string.Join(", ", funcType.Parameters.Select(TypeName))}) {name};");
+
+                    break;
+                }
+            case NubTypeArray arrayType:
+                {
+                    EmitTypeDefinitionIfNotEmitted(arrayType.ElementType);
+
+                    var backingName = Tmp();
+
+                    writer.WriteLine("typedef struct");
+                    writer.WriteLine("{");
+                    using (writer.Indent())
+                    {
+                        writer.WriteLine("size_t count;");
+                        writer.WriteLine("size_t capacity;");
+                        writer.WriteLine($"{CType(arrayType.ElementType)} *items;");
+                        writer.WriteLine("uint32_t ref;");
+                    }
+                    writer.WriteLine($"}} {backingName};");
+                    writer.WriteLine();
+
+                    writer.WriteLine($"typedef {backingName} *{name};");
+                    writer.WriteLine();
+
+                    writer.WriteLine($"static inline void {name}_rc_inc({name} array)");
+                    writer.WriteLine("{");
+                    using (writer.Indent())
+                    {
+                        writer.WriteLine("if (array == NULL) return;");
+                        writer.WriteLine("array->ref += 1;");
+                    }
+                    writer.WriteLine("}");
+                    writer.WriteLine();
+
+                    writer.WriteLine($"static inline void {name}_rc_dec({name} array)");
+                    writer.WriteLine("{");
+                    using (writer.Indent())
+                    {
+                        writer.WriteLine("if (array == NULL) return;");
+                        writer.WriteLine("if (array->ref == 0) return;");
+                        writer.WriteLine();
+                        writer.WriteLine("array->ref -= 1;");
+                        writer.WriteLine();
+                        writer.WriteLine("if (array->ref == 0)");
+                        writer.WriteLine("{");
+                        using (writer.Indent())
+                        {
+                            writer.WriteLine("for (size_t i = 0; i < array->count; ++i)");
+                            writer.WriteLine("{");
+                            using (writer.Indent())
+                            {
+                                EmitCopyDestructor("array->items[i]", arrayType.ElementType);
+                            }
+                            writer.WriteLine("}");
+                            writer.WriteLine();
+                            writer.WriteLine("free(array);");
+                        }
+                        writer.WriteLine("}");
+                    }
+                    writer.WriteLine("}");
+                    writer.WriteLine();
+
+                    writer.WriteLine($"static inline {name} {name}_make()");
+                    writer.WriteLine("{");
+                    using (writer.Indent())
+                    {
+                        writer.WriteLine($"{name} array = ({name})malloc(sizeof({backingName}));");
+                        writer.WriteLine("array->ref = 1;");
+                        writer.WriteLine("array->count = 0;");
+                        writer.WriteLine("array->capacity = 0;");
+                        writer.WriteLine("array->items = NULL;");
+                        writer.WriteLine("return array;");
+                    }
+                    writer.WriteLine("}");
+                    writer.WriteLine();
+
                     break;
                 }
         }
@@ -801,7 +768,7 @@ static inline void {{name}}_rc_inc({{name}} *array)
         var name = Tmp();
         scopes.Peek().DeconstructableNames.Add((name, expression.Type));
 
-        writer.WriteLine($"{CType(expression.Type, name)} = {typeNames[expression.Type]}_make();");
+        writer.WriteLine($"{CType(expression.Type, name)} = {TypeName(expression.Type)}_make();");
 
         foreach (var value in expression.Values)
         {
@@ -869,39 +836,39 @@ static inline void {{name}}_rc_inc({{name}} *array)
         return tmp;
     }
 
-    public string CType(NubType node, string? varName = null)
-    {
-        referencedTypes.Add(node);
-
-        return node switch
-        {
-            NubTypeVoid => "void" + (varName != null ? $" {varName}" : ""),
-            NubTypeBool => "bool" + (varName != null ? $" {varName}" : ""),
-            NubTypeStruct type => CTypeNamed(type, varName),
-            NubTypeAnonymousStruct type => CTypeNamed(type, varName),
-            NubTypeEnum type => CTypeNamed(type, varName),
-            NubTypeEnumVariant type => CType(type.EnumType, varName),
-            NubTypeSInt type => $"i{type.Width}" + (varName != null ? $" {varName}" : ""),
-            NubTypeUInt type => $"u{type.Width}" + (varName != null ? $" {varName}" : ""),
-            NubTypePointer type => CType(type.To) + (varName != null ? $" *{varName}" : "*"),
-            NubTypeString type => "string" + (varName != null ? $" *{varName}" : "*"),
-            NubTypeFunc type => $"{CType(type.ReturnType)} (*{varName})({string.Join(", ", type.Parameters.Select(p => CType(p)))})",
-            NubTypeArray type => $"{CTypeNamed(type)}" + (varName != null ? $" *{varName}" : "*"),
-            _ => throw new ArgumentOutOfRangeException(nameof(node), node, null)
-        };
-    }
-
     private readonly Dictionary<NubType, string> typeNames = [];
 
-    private string CTypeNamed(NubType type, string? varName = null)
+    private string TypeName(NubType type)
     {
         if (!typeNames.TryGetValue(type, out var name))
         {
-            name = Tmp();
+            name = type switch
+            {
+                NubTypeVoid => "void",
+                NubTypeBool => "bool",
+                NubTypeStruct => Tmp(),
+                NubTypeAnonymousStruct => Tmp(),
+                NubTypeEnum => Tmp(),
+                NubTypeEnumVariant t => TypeName(t.EnumType),
+                NubTypeSInt t => $"int{t.Width}_t",
+                NubTypeUInt t => $"uint{t.Width}_t",
+                NubTypePointer => Tmp(),
+                NubTypeString => "string_ptr",
+                NubTypeFunc => Tmp(),
+                NubTypeArray => Tmp(),
+                _ => throw new NotImplementedException(),
+            };
+
             typeNames[type] = name;
         }
 
-        return $"{name}{(varName != null ? $" {varName}" : "")}";
+        return name;
+    }
+
+    private string CType(NubType node, string? varName = null)
+    {
+        referencedTypes.Add(node);
+        return $"{TypeName(node)}" + (varName != null ? $" {varName}" : "");
     }
 
     private string Tmp()
@@ -936,7 +903,7 @@ static inline void {{name}}_rc_inc({{name}} *array)
         {
             case NubTypeArray arrayType:
                 {
-                    writer.WriteLine($"{typeNames[arrayType]}_rc_inc({value});");
+                    writer.WriteLine($"{TypeName(type)}_rc_inc({value});");
                     break;
                 }
             case NubTypeString:
@@ -1012,7 +979,7 @@ static inline void {{name}}_rc_inc({{name}} *array)
         {
             case NubTypeArray arrayType:
                 {
-                    writer.WriteLine($"{typeNames[arrayType]}_rc_dec({value});");
+                    writer.WriteLine($"{TypeName(type)}_rc_dec({value});");
                     break;
                 }
             case NubTypeString: