test.cpp gen_time compiles (has memory issues though)

Readme.md

@@ -0,0 +1,59 @@
+# gencpp
+
+An attempt at simple staged metaprogramming for c/c++.
+
+This project is not minimum feature complete yet. 
+Version 1 will have a most of c and a subset of c++ features available to it.
+
+## How it works
+
+A metaprogram is built to generate files before the main program is built. We'll term runtime for this program as `gen_time`. The metaprogram's core implementation are within `gen.hpp` and `gen.cpp` in the project directory.
+
+`gen.cpp` \`s  `main()` will expect to call one `gen_main()` which the user will have to define once for their program. There they will dictate everything that should be generated.
+
+In order to keep the locality of this code within the same files the following pattern may be used:
+
+Within `program.cpp` :
+```cpp
+#ifdef gen_time
+#include "gen.hpp"
+
+...
+
+u32 gen_main()
+{
+	...
+}
+#endif
+
+
+#ifndef gen_time
+#include "program.gen.cpp"
+
+	// Regular runtime dependent on the generated code here.
+#endif
+```
+This is ofc entirely optional and the metaprogram can be quite separated from the runtime in file organization.
+
+## Building
+
+To fill in.
+
+## Why
+
+Macros in c/c++ are usually painful to debug, and templates can be unless your on a monsterous IDE (and even then fail often).
+
+Unfortunately most programming langauges opt the approach of internally processing the generated code immediately within the AST or not expose it to the user in a nice way to even introspect as a text file. Stage metaprogramming doesn't have this problem, since its entire purpose is to create those generated files.
+
+This is technically what the macro preprocessor does in a basic form, however naturally its easier to deal with for more complex generation.
+
+The drawback naturally is generation functions at face value harder to grasp than something following a template pattern (for simple generation). This drawback becomes less valid the more complex the code generation becomes.
+
+Thus a rule of thumb is if its a simple define you can get away with just the preprocessor, or if the templates being used don't break the debugger, this is most likely not neded.
+
+However, if the code being generated becomes complex, or from a datatable or database, this will be easier to deal with.
+
+# TODO:
+
+* Need problably a better name, I found a few repos with this same one...
+* Actually get to version 1.

project/Bloat.cpp

@@ -1,5 +1,5 @@
 #define BLOAT_IMPL
-#include "Bloat.refactored.hpp"
+#include "Bloat.hpp"
 
 namespace Global
 {

project/Bloat.hpp

@@ -84,7 +84,7 @@ namespace Global
 
 namespace Memory
 {
-	ct uw Initial_Reserve = megabytes(2);
+	ct uw Initial_Reserve = megabytes(10);
 
 	extern arena Global_Arena;
 	#define g_allocator arena_allocator( & Memory::Global_Arena)

project/gen.cpp

@@ -1,9 +1,16 @@
 #include "Bloat.hpp"
+// #define gen_time
 #include "gen.hpp"
 
 #ifdef gen_time
 namespace gen
 {
+	ct Code make()
+	{
+		return { Code::Invalid, nullptr, nullptr, { nullptr } };
+	}
+
+	#if 0
 	static Code Unused()
 	{
 		static Code value = {
@@ -13,13 +20,16 @@ namespace gen
 
 		return value;
 	} 
+	#endif
 
 	Code decl_type( char const* name, Code specifiers, Code type )
 	{
 		Code 
-		result;
+		result      = make();
 		result.Type = Code::Decl_Type;
 		result.Name = string_make( g_allocator, name );
+
+		array_init( result.Entries, g_allocator );
 		result.add( specifiers );
 		result.add( type );
 
@@ -33,11 +43,11 @@ namespace gen
 	)
 	{
 		Code 
-		result;
+		result      = make();
 		result.Type = Code::Decl_Function;
 		result.Name = string_make( g_allocator, name );
 		
-		array_init( result.Content, g_allocator );
+		array_init( result.Entries, g_allocator );
 
 		if ( specifiers )
 			result.add( specifiers );
@@ -55,20 +65,28 @@ namespace gen
 		if (num <= 0)
 			fatal("TT::make_paramters: num is %d", num);
 
-		Code result;
+		Code 
+		result      = make();
+		result.Type = Code::Parameters;
 
 		va_list va;
 		va_start(va, num);
 
 		result.Name = string_make( g_allocator, va_arg(va, char const*) );
-		result.add( va_arg(va, Code) );
 
-		while( num -= 2, num % 2 )
+		array_init( result.Entries, g_allocator );
+
+		Code type = va_arg(va, Code);
+		result.add( type );
+
+		while( num -= 2, num && num % 2 == 0 )
 		{
 			Code
-			param;
+			param      = make();
 			param.Name = string_make( g_allocator, va_arg(va, char const*) );
-			param.add( va_arg(va, Code) );
+
+			type = va_arg(va, Code);
+			param.add( type );
 
 			result.add(param);
 		}
@@ -89,12 +107,12 @@ namespace gen
 		va_end(va);
          
 		Code 
-		code;
+		result         = make();
-		code.Name    = string_make( g_allocator, fmt );
+		result.Name    = string_make( g_allocator, fmt );
-		code.Type    = Code::Untyped;
+		result.Type    = Code::Untyped;
-		code.Content = string_make( g_allocator, buf );
+		result.Content = string_make( g_allocator, buf );
 
-		return code;
+		return result;
 	}
 
 	Code make_function( char const* name
@@ -104,7 +122,7 @@ namespace gen
 		, Code body )
 	{
 		Code 
-		result;
+		result      = make();
 		result.Name = string_make( g_allocator, name );
 		result.Type = Code::Function;
 		
@@ -123,37 +141,51 @@ namespace gen
 		return result;
 	}
 
-	Code make_specifier( u32 num, ... )
+	Code make_specifiers( u32 num, ... )
 	{
 		if ( num <= 0 )
 			fatal("gen::make_specifier: num cannot be zero.");
 
 		Code 
-		result;
+		result         = make();
+		result.Type    = Code::Specifiers;
+		result.Content = string_make( g_allocator, "" );
 
 		va_list va;
 		va_start(va, num);
 		do
 		{
-			Specifier type = va_arg(va, Specifier);
+			Specifier type = (Specifier)va_arg(va, int);
 
 			switch ( type )
 			{
 				case Alignas:
-					result.Content = string_sprintf_buf( g_allocator, "%s(%d)", specifier_str(type), va_arg(va, u32) );
+					result.Content = string_append_fmt( result.Content, "%s(%d)", specifier_str(type), va_arg(va, u32) );
 				break;
 
 				default:
-					result.Content = string_make( g_allocator, specifier_str(type) );
+					const char* str = specifier_str(type);
+
+					result.Content = string_append_fmt( result.Content, "%s", str );
 				break;
 			}
 		}
-		while ( num-- );
+		while ( --num, num );
 		va_end(va);
 
 		return result;
 	}
 
+	Code make_type( char const* name )
+	{
+		Code 
+		result      = make();
+		result.Name = string_make( g_allocator, name );
+		result.Type = Code::Typename;
+
+		return result;
+	}
+
 	string Code::to_string()
 	{
 		string result = string_make( g_allocator, "" );
@@ -173,12 +205,13 @@ namespace gen
 
 			case Decl_Type:
 				if ( Entries[0].Type == Specifiers )
-					result = string_append_fmt("%s\n", Entries[0].to_string());
+					result = string_append_fmt( result, "%s\n", Entries[0].to_string());
 
 				result = string_append_fmt( result, "%s %s;\n", Entries[1].to_string(), Name );
 			break;
 
 			case Decl_Function:
+			{
 				u32 index = 0;
 				u32 left  = array_count( Entries );
 
@@ -207,16 +240,22 @@ namespace gen
 				}
 
 				result = string_appendc( result, ");\n" );
+			}
 			break;
 
 			case Parameters: 
-				result = string_append_fmt( result, "%s %s", Entries[0], Name );
+			{
+				result = string_append_fmt( result, "%s %s", Entries[0].to_string(), Name );
 
 				u32 index = 1;
 				u32 left  = array_count( Entries ) - 1;
 
 				while ( left-- )
-					result = string_append_fmt( result, ", %s %s", Entries[index].Entries[0], Entries[index].Name );
+					result = string_append_fmt( result, ", %s %s"
+						, Entries[index].Entries[0].to_string()
+						, Entries[index].Name 
+					);
+			}
 			break;
 
 			case Struct:
@@ -224,31 +263,36 @@ namespace gen
 			break;
 
 			case Function:
+			{
 				u32 index = 0;
 				u32 left  = array_count( Entries );
 
 				if ( left <= 0 )
 					fatal( "Code::to_string - Name: %s Type: %s, expected definition", Name, Type );
 
-				while ( Entries[index].Type == EType::Specifiers )
+				if ( Entries[index].Type == Specifiers )
 				{
-					result = string_append_fmt( result, "%s ", Entries[index] );
+					result = string_append_fmt( result, "%s\n", Entries[index].to_string() );
 					index++;
+					left--;
 				}
 
 				if ( left <= 0 )
 					fatal( "Code::to_string - Name: %s Type: %s, expected return type", Name, Type );
 
-				result = string_append_fmt( result, "\n%s %s(", Entries[index], Name );
+				result = string_append_fmt( result, "\n%s %s(", Entries[index].to_string(), Name );
 				index++;
+				left--;
 
-				while ( left && Entries[index].Type == Parameters )
+				if ( left && Entries[index].Type == Parameters )
 				{
-					result = string_append_fmt( result, "%s, ", Entries[index] );
+					result = string_append_fmt( result, "%s, ", Entries[index].to_string() );
 					index++;
+					left--;
 				}
 
-				result = string_append_fmt( result, ")\n{\n%s\n}", Entries[index] );
+				result = string_append_fmt( result, ")\n{\n%s\n}", Entries[index].to_string() );
+			}
 			break;
 
 			case Specifiers:
@@ -260,18 +304,41 @@ namespace gen
 			break;
 
 			case Typename:
+				result = string_append_fmt( result, "%s", Name );
 			break;
 		}
 
 		return result;
 	}
+
+	void Builder::print( Code code )
+	{
+		Buffer = string_append( Buffer, code.to_string() );
+	}
+
+	bool Builder::open( char const* path )
+	{
+		file_error error = file_open_mode( & File, ZPL_FILE_MODE_WRITE, path );
+
+		if ( error != ZPL_FILE_ERROR_NONE )
+		{
+			fatal( "gen::File::open - Could not open file: %s", path);
+			return false;
+		}
+
+		Buffer = string_make( g_allocator, "" );
+		
+		return true;
+	}
+
+	void Builder::write()
+	{
+		bool result = file_write( & File, Buffer, string_length(Buffer) );
+
+		if ( result == false )
+			fatal("gen::File::write - Failed to write to file: %s", file_name( & File ) );
+
+		file_close( & File );
+	}
 }
-
+#endif
-
-int main()
-{
-	gen_main();
-
-	return 0;
-}
-#endif gen_time

project/gen.hpp

@@ -1,8 +1,8 @@
 #pragma once
 
-#ifdef gen_time
 #include "Bloat.hpp"
 
+#ifdef gen_time
 namespace gen
 {
 	ct sw ColumnLimit = 256;
@@ -119,7 +119,7 @@ namespace gen
 		forceinline
 		operator bool()
 		{
-			return Type == Invalid;
+			return Type != Invalid;
 		}
 
 		operator char const*()
@@ -180,7 +180,7 @@ namespace gen
 		, Code ret_type
 	);
 
-	Code make_parameters( u32 num, ... );
+	Code make_parameters( s32 num, ... );
 	
 	Code make_fmt( char const* fmt, ... );
 
@@ -197,20 +197,22 @@ namespace gen
 
 	// Code make_template( Code subject, u32 num_dependents, ... );
 
-	// Code make_type( char const* name );
+	Code make_type( char const* name );
 
 	// Code make_using( char const* name, char const* type );
 
 
-	struct File
+	struct Builder
 	{
-		zpl_file file;
+		zpl_file File;
-		string   Content;
+		string   Buffer;
 
-		s32 print( Code );
+		void print( Code );
 
-		bool open( char const* Path );
+		bool open( char const* path );
 		void write();
 	};
 }
+
+#define gen_main main
 #endif

scripts/build.ci.ps1

@@ -14,16 +14,16 @@ foreach ( $arg in $args )
 }
 
 
-if ($false)
-{
-#region Regular Build
-write-host "Building project`n"
-
 $path_root    = git rev-parse --show-toplevel
 $path_build   = Join-Path $path_root build
 $path_scripts = Join-Path $path_root scripts
 
 
+if ($false)
+{
+#region Regular Build
+write-host "Building project`n"
+
 if ( -not( Test-Path $path_build ) ) 
 {
 	$args_meson = @()
@@ -87,7 +87,13 @@ Pop-Location
 	$args_ninja += $path_gen_build
 
 	Push-Location $path_root
-	ninja $args_ninja
+	& ninja $args_ninja
+	Pop-Location
+
+	$gencpp = Join-Path $path_gen_build gencpp.exe
+
+	Push-location $path_gen
+	& $gencpp
 	Pop-Location
 
 

scripts/clean.ps1

@@ -1,7 +1,9 @@
 $path_root       = git rev-parse --show-toplevel
 $path_build      = Join-Path $path_root build
 $path_test       = Join-Path $path_root test
+$path_gen        = Join-Path $path_test gen
 $path_test_build = Join-Path $path_test build
+$path_gen_build  = Join-Path $path_gen  build
 
 if ( Test-Path $path_build ) 
 {
@@ -13,6 +15,11 @@ if ( Test-Path $path_test_build )
 	Remove-Item $path_test_build -Recurse
 }
 
+if ( Test-Path $path_gen_build )
+{
+	Remove-Item $path_gen_build -Recurse
+}
+
 # [string[]] $include = '*.h', '*.hpp', '*.cpp'
 # [string[]] $exclude =
 

test/array.gen.manual.hpp.txt

@@ -1,13 +0,0 @@
-// Handwritten generated code:
-
-
-#pragma region gen_array
-
-
-
-
-#pragma endregion gen_array
-
-
-
-#define Array( Type_ ) Array_##Type_

test/array.hpp.txt

@@ -1,164 +0,0 @@
-#include "gen.hpp"
-#include "bloat.hpp"
-
-#if tt 
-	#define gen_array( Type_ ) gen__array( #Type_ )
-	Code* gen__array( char const* type )
-	{
-		Code codegen;
-
-		Code 
-		data;
-		data.add( "%type* data" );
-
-		Code header;
-		header.define_struct( "Header", 
-			"uw        Num;"
-			"uw        Capacity;"
-			"allocator Allocator;"
-		);
-		
-		Code grow_formula;
-		grow_formula.define_function( "grow_formula", "static", "forceinline",
-			"return 2 * value * 8"
-		);
-
-		codegen.define_struct( "Array",
-			data
-		,	header
-		,	grow_formula 	
-		);
-
-		codegen.define
-		
-			R"(
-				%type* data;
-
-				struct Header
-				{
-					uw        Num;
-					uw        Capacity;
-					allocator Allocator;
-				};
-
-				static forceinline
-				sw grow_formula ( sw value )
-				{
-					return 2 * value * 8;
-				}
-
-				static
-				bool init ( %Array& array, allocator mem_handler )
-				{
-					return init_reserve( array, mem_handler, grow_formula(0) );
-				}
-
-				static
-				bool init_reserve( %Array& array, allocator mem_handler, uw capacity )
-				{
-					Header* 
-					header = nullptr;
-					header = rcast( Header*, alloc( mem_handler, size_of( Header ) + sizeof(type) * capacity ));
-
-					if (header == nullptr)
-						return false;
-
-					header->Num       = 0;
-					header->Capacity  = capacity;
-					header->Allocator = mem_handler;
-
-					array.data = rcast( %type*, header + 1 );
-
-					return true;
-				}
-
-				void append( %type value )
-				{
-
-				}
-
-				type back()
-				{
-					Header& header = get_header();
-					return data[ header.Num - 1 ];
-				}
-
-				void clear()
-				{
-					get_header().Num = 0;
-				}
-
-				void fill( uw begin, uw end, type value )
-				{
-					Header& header = get_header();
-					
-					if ( begin < 0 || end >= header.Num )
-					{
-						fatal( "Range out of bounds" );
-					}
-				}
-
-				void free()
-				{
-					Header& header = get_header();
-					::free( header.Allocator, & get_header() );
-				}
-
-				bool grow( uw min_capacity )
-				{
-					Header& header = get_header();
-					
-					uw new_capacity = grow_formula( header.Capacity );
-
-					if ( new_capacity < min_capacity )
-						new_capacity = min_capacity;
-
-					return set_capacity( new_capacity );
-				}
-
-				forceinline
-				Header& get_header()
-				{
-					return vcast( Header, data - 1 );
-				}
-
-				void pop()
-				{
-
-				}
-
-				void reserve()
-				{
-
-				}
-
-				void resize()
-				{
-
-				}
-
-				bool set_capacity( uw capacity )
-				{
-					Header& header = get_header();
-
-					if ( capacity == header.Capacity )
-					{
-
-					}
-				}
-			)"
-		,	type
-		);
-	};
-	#endif
-
-	void tt_run()
-	{
-		gen_array( u32 );
-	}
-#endif tt
-
-
-#if !tt
-	#include "array.gen.manual.hpp"
-#endif

test/gen/meson.build

@@ -4,15 +4,14 @@ project( 'test', 'c', 'cpp', default_options : ['buildtype=debug'] )
 
 includes = include_directories( 
 [ 
-	'../test'
+	'../../project',
-	'../project'
+	'../../thirdparty' 
-	, '../thirdparty' 
 ])
 
 # get_sources = files('./get_sources.ps1')
 # sources     = files(run_command('powershell', get_sources, check: true).stdout().strip().split('\n'))
 
-sources = [ 'test.cpp' ]
+sources = [ '../test.cpp' ]
 
 if get_option('buildtype').startswith('debug')
 
@@ -20,6 +19,6 @@ if get_option('buildtype').startswith('debug')
 
 endif
 
-  add_project_arguments('-Dgen_time', langauge : ['c', 'cpp'])
+  add_project_arguments('-Dgen_time', language : ['c', 'cpp'])
 
-executable( '', sources, include_directories : includes )
+executable( 'gencpp', sources, include_directories : includes )

test/math.hpp

@@ -1,9 +1,9 @@
 #pragma once
 
-#ifdef gen_time
+#include "Bloat.hpp"
-	#include "Bloat.hpp"
+#include "gen.hpp"
-	#include "gen.hpp"
 
+#ifdef gen_time
 	using namespace gen;
 
 	/*
@@ -15,8 +15,8 @@
 			return value * value;
 		}
 	*/
-	#define gen_square( Type_ ) gen__squre( #Type_ )
+	#define gen_square( Type_ ) gen__square( #Type_ )
-	Code gen__squre( char const* type )
+	Code gen__square( char const* type )
 	{
 		Code integral_type = make_type( type );
 
@@ -41,17 +41,17 @@
 	u32 gen_math()
 	{
 		Code fadd_u8  = gen_square( u8 );
-		Code fadd_u16 = gen_square( u16 );
+		// Code fadd_u16 = gen_square( u16 );
-		Code fadd_u32 = gen_square( u32 );
+		// Code fadd_u32 = gen_square( u32 );
-		Code fadd_u64 = gen_square( u64 );
+		// Code fadd_u64 = gen_square( u64 );
 
-		File 
+		Builder 
 		mathgen;
 		mathgen.open( "math.gen.hpp" );
 		mathgen.print( fadd_u8 );
-		mathgen.print( fadd_u16 );
+		// mathgen.print( fadd_u16 );
-		mathgen.print( fadd_u32 );
+		// mathgen.print( fadd_u32 );
-		mathgen.print( fadd_u64 );
+		// mathgen.print( fadd_u64 );
 		mathgen.write();
 		return 0;
 	}

test/test.cpp

@@ -1,17 +1,28 @@
+#include "Bloat.cpp"
 #include "math.hpp"
 
 
 #ifdef gen_time
-u32 gen_main()
-{
-	return gen_math();
-}
-
 #include "gen.cpp"
+
+int gen_main()
+{
+	Memory::setup();
+
+	zpl_printf("\nPress any key after attaching to process\n");
+	getchar();
+
+	int result = gen_math();
+
+	Memory::cleanup();
+	return result;
+}
 #endif
 
 
 #ifndef gen_time
+#include "math.hpp"
+
 int main()
 {
 	u32 result = square(5);