step towards c++

CxxBuilder/src/Program.bf

@@ -11,6 +11,12 @@ static class Program
 
 	public static int Main(String[] args)
 	{
+		if (args.Count == 3 && args[0] == "---__defsyms__")
+		{
+			GenerateAliases(args);
+			return 0;
+		}
+
 		mixin PrintUsage()
 		{
 			Console.WriteLine("""
@@ -19,8 +25,9 @@ static class Program
 				Usage: $(Var CxxBuilderExe) [<options>] <patterns...> -- src=<> target=<> config=<> builddir=<> output=<> [cflags=<>]
 				Example: $(Var CxxBuilderExe) **.c vk_*.cpp -- "src=$(ProjectDir)/MyLib/src" target=$(TargetTriple) config=$(Configuration) "builddir=$(BuildDir)" output=MyLib cflags=-Isome/dir
 
-				--template - TODO
 				--cmake - builds $src/CMakeLists.txt to build, patterns and output are ignored
+				! --template - TODO
+				! --cpp-aliases - creates aliases from the mangled c++ symbols to the symbols queried by Cpp2Beef-generated c++ bindigs
 
 				$src - The source dir, all patterns are rooted here
 				$target - the llvm target triple passed to clang
@@ -36,27 +43,36 @@ static class Program
 		{
 			if (!condition)
 			{
-				Console.WriteLine(str);
+				Console.Error.WriteLine(str);
 				return 1;
 			}
 		}
 
 		enum { Default, CMake, Template } mode = .Default;
+		enum { None, CppAliases } actions = .None;
 		StringView src = null, target = null, config = null, builddir = null, output = null, cflags = null;
 		var iter = args.GetEnumerator();
 		skipPatterns: do
 		{
 			for (let arg in iter)
 			{
-				if (arg == "--") break skipPatterns;
+				if (!arg.StartsWith("--")) continue;
-				if (arg == "--cmake")
+				switch (arg)
 				{
+				case "--": break skipPatterns;
+				case "--cmake":
 					Assert!(mode == .Default, "Conflicting options");
 					mode = .CMake;
+				/*case "--cpp-aliases":
+					actions |= .CppAliases;*/
+				default:
+					Console.Error.WriteLine($"Invalid option {_}");
+					return 1;
 				}
 			}
 			PrintUsage!();
 		}
+		Assert!(!(mode == .CMake && actions.HasFlag(.CppAliases)), "Comflicting options --cmake and --cpp-aliases");
 		for (let arg in iter)
 		{
 			var parts = arg.Split('=', 2);
@@ -84,7 +100,7 @@ static class Program
 		Assert!(!target.IsNull, "Missing var 'target'");
 		Assert!(!config.IsNull, "Missing var 'config'");
 		Assert!(!builddir.IsNull, "Missing var 'builddir'");
-		Assert!(!output.IsNull || mode == .CMake, "Missing var 'output'");
+		Assert!(!output.IsNull || (mode == .CMake && !actions.HasFlag(.CppAliases)), "Missing var 'output'");
 
 		switch (mode)
 		{
@@ -104,14 +120,14 @@ static class Program
 				WriteVarPath("builddir", builddir);
 				buffer.AppendF($"""
 					target = {target}
-					cflags = {(config == "Release") ? "-O2" : "-O2 -g"} {cflags}
+					cflags = {(config == "Release") ? "-O3" : "-O2 -g"} {cflags}
 					""");
 				writer.Write(buffer);
 			}
 			writer.Write("""
 				\n
 				cc = clang
-				ar = ar
+				ar = llvm-ar
 
 				rule cc
 				  command = $cc $cflags -target $target -MD -MF $out.d -c -o $out $in
@@ -126,7 +142,8 @@ static class Program
 
 				""");
 			String ar = scope .(1024);
-			ar.AppendF($"\nbuild $builddir/{output}.{target.Contains("windows") ? "lib" : "a"}: ar");
+			StringView libExtension = target.Contains("windows") ? "lib" : "a";
+			ar.AppendF($"\nbuild $builddir/{output}.{libExtension}: ar");
 
 			int pcount = 0;
 			for (let arg in args)
@@ -148,11 +165,45 @@ static class Program
 			let abssrc = Path.GetAbsolutePath(src, Directory.GetCurrentDirectory(..scope .(128)), ..scope .(128)); 
 			if (FileMatcher.HandleMatches(patterns, abssrc, scope => HandleMatch) case .Err(let err))
 			{
-				Console.WriteLine($"Syntax Error in Pattern: {err}");
+				Console.Error.WriteLine($"Syntax Error in Pattern: {err}");
 				return 1;
 			}
 
 			writer.WriteLine(ar);
+
+			if (actions.HasFlag(.CppAliases))
+			{
+				const String exec = .Empty
+#if BF_PLATFORM_WINDOWS
+				+ "cmd /c ";
+#endif
+				writer.Write($"""
+
+					nm = llvm-nm
+					ld = {exec}ld
+
+					rule nm
+					  command = {exec}$nm --demangle $in > $out
+					  description = Exporting symbols from $in
+
+					rule generate_aliases
+					  command = "{Environment.GetExecutableFilePath(..scope .(64))}" ---__defsyms__ $in $out
+					  description = Generating aliases
+
+					rule ld_aliases
+					  command = $ld -r -o $out @$in "$builddir/{output}.{libExtension}"
+					  description = Creating aliases
+
+					rule ar_add
+					  command = $ar qs $builddir/{output}.{libExtension} $in
+
+					build $builddir/_symbols__.txt: nm $builddir/{output}.{libExtension}
+					build $builddir/_aliases__.txt: generate_aliases $builddir/_symbols__.txt
+					build $builddir/_aliases__.o: ld_aliases $builddir/_aliases__.txt
+					build add_to_output: ar_add $builddir/_aliases__.o
+
+					""");
+			}
 		case .CMake:
 #if !DEBUG
 			if (File.Exists(scope $"{builddir}/build.ninja"))
@@ -167,9 +218,84 @@ static class Program
 		case .Template: //TODO
 		}
 
-		let ret = system(scope $"ninja -C {builddir}");
+		var ret = system(scope $"ninja -C {builddir}");
+		mixin CheckRetCode(StringView fmt)
+		{
 			if (ret != 0)
-			Console.WriteLine($"Failed to build {output}");
+			{
+				Console.Error.WriteLine(fmt, output);
 				return ret;
 			}
 		}
+		CheckRetCode!("Failed to build {}");
+
+		/*if (actions.HasFlag(.CppAliases))
+		{
+			let aliasesDir = scope $"{builddir}/cpp2beef_aliases";
+			Directory.CreateDirectory(aliasesDir);
+			{
+				StreamWriter writer = scope .()..Create(scope $"{aliasesDir}/aliases.c");
+				ret = system(scope $"llvm-nm --export-symbols \"{builddir}/{output}.{target.Contains("windows") ? "lib" : "a"}\" > {aliasesDir}/mangled.txt");
+				CheckRetCode!("Failed to fetch symbols from {}");
+				ret = system(scope $"cat {aliasesDir}/mangled.txt | llvm-undname >{aliasesDir}/demangled.txt 2>{
+#if BF_PLATFORM_WINDOWS
+					("nul")
+#else
+					("/dev/null")
+#endif
+				}");
+				CheckRetCode!("Failed to demangle symbols from {}");
+				var mangled = scope StreamReader()..Open(scope $"{aliasesDir}/magled.txt").Lines;
+				var demangled = scope StreamReader()..Open(scope $"{aliasesDir}/demangled.txt").Lines;
+				for (let dline in demangled)
+				{
+					if (dline->IsEmpty) continue;
+					let mline = mangled.GetNext().Value;
+					if (mline == dline) continue;
+					String identifier = scope .(dline);
+					for (let i < identifier.Length)
+						if (!identifier[i].IsLetterOrDigit)
+							identifier[i] = '_';
+					writer.Write($"extern void {identifier}() __attribute__((weak, alias(\"{mline.Value}\")));\n");
+				}
+			}
+			File.WriteAllText(scope $"{aliasesDir}/build.ninja", scope $"""
+				rule cc
+				  command = clang -x c -target {target} -c -o $out $in
+				  description = Compiling aliases for {output}
+
+				build aliases.o: cc aliases.c
+
+				""");
+			ret = system(scope $"ninja -C {aliasesDir}");
+			CheckRetCode!("Failed to build aliases for {}");
+		}*/
+
+		return 0;
+	}
+
+	static void GenerateAliases(String[] args)
+	{
+		StreamReader reader = scope .()..Open(args[1]);
+		StreamWriter writer = scope .()..Create(args[2]);
+		String str = scope .(256);
+		for (var line in reader.Lines)
+		{
+			line->Trim();
+			if (line->IsEmpty || line->EndsWith(':')) continue;
+			var split = line->Split(' ', 3);
+			if (split.GetNext().Value == "U") continue;
+			int addr = int.Parse(split.Current, .Hex);
+			let kind = split.GetNext().Value;
+			if (kind != "T" || addr == 0) continue;
+			let sym = split.GetNext().Value;
+			if (!str.IsEmpty) str..Clear()..Append(' ');
+			str.Append("--defsym=");
+			for (let i < sym.Length)
+				str.Append(sym[i].IsLetterOrDigit ? sym[i] : '_');
+			str.Append('=');
+			addr.ToString(str);
+			writer.Write(str);
+		}
+	}
+}

src/ClangC.bf

@@ -164,7 +164,7 @@ static class Program
 		}
 
 		Directory.CreateDirectory("clang-c");
-		generator.Generate("clang-c.h", null);
+		generator.Generate("clang-c.h");
 
 		return 0;
 	}

src/Generator.bf

@@ -64,6 +64,7 @@ abstract class Cpp2BeefGenerator
 		}, &attrs);
 
 		if (Clang.GetCursorAvailability(cursor) == .Deprecated) str.Append("[Obsolete] ");
+		//if (Clang.Cursor_IsFunctionInlined(cursor) != 0) str.Append("[Inline] ");
 		if (cursor.kind == .EnumDecl) str.Append("[AllowDuplicates] ");
 		else if (attrs.HasFlag(.Packed)) str.Append("[Packed] ");
 		if (attrs.HasFlag(.NoDiscard)) str.Append("[NoDiscard] ");
@@ -197,13 +198,10 @@ abstract class Cpp2BeefGenerator
 		return false;
 	}
 
-	protected virtual void ModifyWrapperPrintingPolicy(CXPrintingPolicy policy) {}
-
 	protected CXIndex index = Clang.CreateIndex(excludeDeclarationsFromPCH: 0, displayDiagnostics: 1) ~ Clang.DisposeIndex(_);
 	protected CXTranslationUnit unit;
 
 	protected append String str = .(1024);
-	protected append String wrapperBuf = .(1024);
 	protected CXCursor currentCursor = Clang.GetNullCursor();
 	protected append String cursorIndent = .(16);
 
@@ -213,8 +211,6 @@ abstract class Cpp2BeefGenerator
 	protected CXPrintingPolicy printingPolicy;
 
 	private StreamWriter currentWritter;
-	private StreamWriter wrapperWritter;
-	protected StringView WrapperFilePath;
 
 	private append String wrapperTemplateChain = .(16);
 	private append String templateParams = .(16);
@@ -229,7 +225,7 @@ abstract class Cpp2BeefGenerator
 	protected class FileInfo : this(CXSourceLocation prevEnd, CXFile file)
 	{
 		public append String block = .(64);
-		public enum { None = 0, LSquirly = 1, RSquirly = 0b10 } queuedTokens = .None;
+		public enum { None = 0, LSquirly = 1, RSquirly = _<<1, Semicolon = _<<1 } queuedTokens = .None;
 		public (CXType type, int32 curWidth) bitfield = default;
 	}
 	protected FileInfo fileInfo = null;
@@ -279,40 +275,12 @@ abstract class Cpp2BeefGenerator
 		ParsingFailed
 	}
 
-	public Result<void, GenerationError> Generate(char8* headerPath, StringView wrapperPath = null)
+	public Result<void, GenerationError> Generate(char8* headerPath)
 	{
 		unitMacros.Clear();
 		fileInfos.Clear();
 		lastRecordOrEnum = Clang.GetNullCursor();
 
-		if (!wrapperPath.IsNull)
-		{
-			wrapperWritter = scope:: .();
-			wrapperWritter.Create(wrapperPath);
-			WrapperFilePath = wrapperPath;
-			wrapperBuf.Set("""
-				#define private public
-				#define protected public
-
-				#include "
-				""");
-			Path.GetFileName(.(headerPath), wrapperBuf);
-			wrapperBuf.Append("""
-				"
-				#include <stdint.h>
-
-				template <typename T>
-				using __type = T;
-
-				extern "C"
-				{
-
-				""");
-			FlushWrapper();
-		}
-		else
-			wrapperWritter = null;
-
 		let args = Args;
 #if DEBUG
 		findLang: do
@@ -331,7 +299,7 @@ abstract class Cpp2BeefGenerator
 		if (unit == default) return .Err(.ParsingFailed);
 
 		printingPolicy = Clang.GetCursorPrintingPolicy(Clang.GetTranslationUnitCursor(unit));
-		ModifyWrapperPrintingPolicy(printingPolicy);
+		Clang.PrintingPolicy_SetProperty(printingPolicy, .TerseOutput, 1);
 		defer Clang.PrintingPolicy_Dispose(printingPolicy);
 
 		PreGeneration();
@@ -371,9 +339,6 @@ abstract class Cpp2BeefGenerator
 		}, Internal.UnsafeCastToPtr(this));
 		PostGeneration();
 
-		if (wrapperBuf.IsEmpty)
-			wrapperWritter.Write("}\n\n//begin-comptime\n");
-
 		for (let kv in fileInfos)
 		{
 			fileInfo = kv.value;
@@ -462,11 +427,6 @@ abstract class Cpp2BeefGenerator
 		currentWritter.Write(str);
 		str.Clear();
 	}
-	protected void FlushWrapper()
-	{
-		wrapperWritter.Write(wrapperBuf);
-		wrapperBuf.Clear();
-	}
 
 	protected virtual void GetIndentation(CXSourceLocation location, String outString)
 	{
@@ -627,6 +587,8 @@ abstract class Cpp2BeefGenerator
 
 				QueuedToken!(decltype(fileInfo.queuedTokens).LSquirly, "{");
 				QueuedToken!(decltype(fileInfo.queuedTokens).RSquirly, "}");
+				if (!fileInfo.queuedTokens.HasFlag(.RSquirly))
+					QueuedToken!(decltype(fileInfo.queuedTokens).Semicolon, ";");
 
 				if (!isWritingQueuedToken) continue;
 				if (fileInfo.queuedTokens == .None) block = @block;
@@ -866,22 +828,18 @@ abstract class Cpp2BeefGenerator
 		}
 	}
 
-	const int int_maxDigits = scope $"{int.MaxValue:X}".Length + 1;
-	protected virtual void CppWrapperName(CXCursor cursor, String outString)
-	{
-		String hashCode = ScopeCXString!(Clang.GetCursorUSR(cursor))
-			.GetHashCode().ToString(..scope .(int_maxDigits), "X", null);
-		outString.Append("cpp2beef_");
-		if (hashCode.StartsWith('-')) hashCode[0] = 'm';
-		outString.Append('0', int_maxDigits - hashCode.Length);
-		outString.Append(hashCode);
-	}
-
 	protected virtual enum { C, Cpp } Linkable_Attributes(CXCursor cursor)
 	{
 		let mangledName = ScopeCXString!(Clang.Cursor_GetMangling(cursor));
 		let name = GetNameInBindings(cursor, ..scope .(mangledName.Length));
 		WriteCustomAttributes(cursor);
+		void LinkNameWhitespace()
+		{
+			if (Flags.HasFlag(.PreseveColumns))
+				str..Append('\n')..Append(cursorIndent);
+			else
+				str.Append(' ');
+		}
 		if (mangledName == name)
 		{
 			str.Append("[CLink] ");
@@ -892,19 +850,15 @@ abstract class Cpp2BeefGenerator
 			str.Append("[LinkName(");
 			mangledName.QuoteString(str);
 			str.Append(")]");
+			LinkNameWhitespace();
 			return .C;
 		}
 		else
 		{
-			str.Append("[LinkName(\"");
+			str.Append("[LinkName(");
-			CppWrapperName(cursor, str);
+			ScopeCXString!(Clang.GetCursorPrettyPrinted(cursor, printingPolicy)).QuoteString(str);
-			str.Append('"');
-			if (!wrapperTemplateChain.IsEmpty)
-				if (templateParams.IsEmpty)
-					str.Append(" + __template_chain");
-				else
-					str.Append(" + CppWrapperF($\"", wrapperTemplateChain, "\")");
 			str.Append(")]");
+			LinkNameWhitespace();
 			return .Cpp;
 		}
 	}
@@ -1111,89 +1065,9 @@ abstract class Cpp2BeefGenerator
 		}
 	}
 
-	protected virtual void WriteMethodWrapper(CXCursor cursor)
-	{
-		let parent = Clang.GetCursorType(Clang.GetCursorSemanticParent(cursor));
-		var resultType = Clang.GetCursorResultType(cursor);
-		bool nonStatic = (cursor.kind == .CXXMethod && Clang.CXXMethod_IsStatic(cursor) == 0) || cursor.kind == .Destructor || cursor.kind == .ConversionFunction;
-
-		if (!wrapperTemplateChain.IsEmpty)
-			FlushWrapper();
-		StringView parentSpelling = "\" + __cpp_type + \"";
-		if (wrapperTemplateChain.IsEmpty)
-			parentSpelling = ScopeCXString!::(Clang.GetFullyQualifiedName(parent, printingPolicy, 0));
-
-		if (cursor.kind == .Constructor)
-			wrapperBuf.Append("__type<", parentSpelling, "> ");
-		else
-		{
-			wrapperBuf.Append("__type<");
-			wrapperBuf.Append(ScopeCXString!(Clang.GetFullyQualifiedName(resultType, printingPolicy, 0)));
-			wrapperBuf.Append("> ");
-		}
-		CppWrapperName(cursor, wrapperBuf);
-		if (!wrapperTemplateChain.IsEmpty)
-		{
-			if (templateParams.IsEmpty)
-				wrapperBuf.Append("\" + __template_chain + \"");
-			else
-				wrapperBuf.Append("\" + CppWrapperF($\"", wrapperTemplateChain, "\") + \"");
-		}
-		wrapperBuf.Append('(');
-		if (nonStatic)
-			wrapperBuf.Append(parentSpelling, " *self");
-		for (int i < Clang.Cursor_GetNumArguments(cursor))
-		{
-			let arg = Clang.Cursor_GetArgument(cursor, (.)i);
-			if (nonStatic || i > 0) wrapperBuf.Append(", ");
-			wrapperBuf.Append("__type<");
-			wrapperBuf.Append(ScopeCXString!(Clang.GetFullyQualifiedName(Clang.GetCursorType(arg), printingPolicy, 0)));
-			wrapperBuf.Append("> p");
-			i.ToString(wrapperBuf);
-		}
-		wrapperBuf.Append(") { ");
-		if (resultType.kind != .Void) wrapperBuf.Append("return ");
-		if (nonStatic)
-		{
-			if (cursor.kind != .Destructor)
-				wrapperBuf.Append("self->", GetCursorSpelling!(cursor));
-			else
-				wrapperBuf.Append("self->~", parentSpelling);
-		}
-		else if (cursor.kind == .Constructor)
-			wrapperBuf.Append("return ", parentSpelling);
-		else
-			wrapperBuf.Append(fullCursorName);
-		wrapperBuf.Append('(');
-		for (int i < Clang.Cursor_GetNumArguments(cursor))
-		{
-			if (i > 0) wrapperBuf.Append(", ");
-			wrapperBuf.Append('p');
-			i.ToString(wrapperBuf);
-		}
-		wrapperBuf.Append("); }");
-
-		if (wrapperTemplateChain.IsEmpty)
-		{
-			wrapperBuf.Append('\n');
-			FlushWrapper();
-		}
-		else
-		{
-			if (defferedWrapperWrite == null)
-				defferedWrapperWrite = new .(1024);
-			defferedWrapperWrite.Append(cursorIndent, "\t + \"extern \\\"C\\\" ");
-			wrapperBuf.ToString(defferedWrapperWrite);
-			defferedWrapperWrite.Append("\\n\"\n");
-			wrapperBuf.Clear();
-		}
-	}
-
 	protected virtual void FunctionDecl(CXCursor cursor)
 	{
-		if (Linkable_Attributes(cursor) == .Cpp)
+		Linkable_Attributes(cursor);
-			WriteMethodWrapper(cursor);
-
 		AccessSpecifier(cursor);
 		str.Append("static extern ");
 		WriteTypeAndName(cursor, Clang.GetCursorResultType(cursor));
@@ -1208,8 +1082,7 @@ abstract class Cpp2BeefGenerator
 	{
 		void Attributes()
 		{
-			if (Linkable_Attributes(cursor) == .Cpp)
+			Linkable_Attributes(cursor);
-				WriteMethodWrapper(cursor);
 		}
 
 		let spelling = GetCursorSpelling!(cursor);
@@ -1345,18 +1218,6 @@ abstract class Cpp2BeefGenerator
 			if (linkLang == .Cpp && type.kind != .LValueReference && type.kind != .RValueReference)
 				str.Append("ref ");
 			WriteTypeAndName(cursor, type);
-			if (linkLang == .Cpp)
-			{
-				let wrapperName = CppWrapperName(cursor, ..scope .());
-				str.Append(" { [LinkName(\"", wrapperName, "\")] get; }");
-				wrapperBuf.Append("__type<");
-				wrapperBuf.Append(ScopeCXString!(Clang.GetFullyQualifiedName(type, printingPolicy, 0)));
-				wrapperBuf.Append("> ");
-				if (type.kind != .LValueReference && type.kind != .RValueReference)
-					wrapperBuf.Append('&');
-				wrapperBuf.Append(wrapperName, "() { return ", fullCursorName, "; }\n");
-				FlushWrapper();
-			}
 			str.Append(';');
 		default:
 			Runtime.FatalError(scope $"Unhandled var linkage: {_}");
@@ -1381,9 +1242,10 @@ abstract class Cpp2BeefGenerator
 		}, null) != 0;
 	}
 
-	protected virtual void Record(CXCursor cursor)
+	protected virtual void Record(CXCursor cursor, bool attributes = true)
 	{
 		WriteCustomAttributes(cursor);
+		if (attributes)
 			switch (cursor.kind)
 			{
 			case .StructDecl, .ClassDecl: str.Append("[CRepr] ");
@@ -1483,9 +1345,22 @@ abstract class Cpp2BeefGenerator
 			Self self = (.)Internal.UnsafeCastToObject(client_data);
 			if (self.fileInfo.bitfield != default && Clang.Cursor_IsBitField(cursor) == 0)
 				self.DumpBitfieldStorage();
-			self.WriteCursor(cursor);
 			if (Clang.Cursor_IsAnonymousRecordDecl(cursor) != 0)
-				self.str..TrimEnd()..Append(";");
+			{
+				self.BeginCursor(cursor);
+				switch (cursor.kind)
+				{
+				case .StructDecl, .ClassDecl: self.str.Append("[CRepr] ");
+				case .UnionDecl: self.str.Append("[CRepr, Union] ");
+				default: Runtime.FatalError("Unhandled record type");
+				}
+				self.AccessSpecifier(cursor);
+				self.str.Append("using ");
+				self.Record(cursor, attributes: false);
+				self.fileInfo.queuedTokens |= .Semicolon;
+			}
+			else
+				self.WriteCursor(cursor);
 			return .Continue;
 		}, Internal.UnsafeCastToPtr(this));