morphisms: fix bitshift in lenpfx to msb-cont

* add command line parsing
* read morphism base directory from environment
* generate C library of multiple morphisms

Cargo.toml

@@ -8,3 +8,5 @@ chumsky = "0.9.0"
 ariadne = "0.2"
 laddertypes = { path = "../lib-laddertypes", features = ["pretty"] }
 tiny-ansi = { version = "0.1.0" }
+clap = { version = "4.5.37", features = ["derive"] }
+walkdir = "2.5.0"

examples/01-uint-example/.gitignore

@@ -0,0 +1 @@
+build/

examples/01-uint-example/main.c

@@ -0,0 +1,14 @@
+#include "morphisms.h"
+
+int main(int argc, char* argv[]) {
+    if( argc > 1 ) {
+        uint64_t value;
+        demarshal( argv[1], &value );
+
+        uint64_t result = value * value;
+
+        char buf[256];
+        marshal( &result, buf );
+        printf("%s\n", buf);
+    }
+}

examples/01-uint-example/makefile

@@ -0,0 +1,23 @@
+all: build/square
+.PHONY: build clean
+
+build:
+	mkdir -p build
+
+build/morphisms.h: build
+	ldmc \
+     -m "marshal: \
+	        ℕ ~ native.UInt64 \
+	    --> ℕ ~ <PosInt 10 BigEndian> ~ <Seq~<ValueTerminated 0> <Digit 10>~Char~Ascii~native.UInt8>" \
+\
+     -m "demarshal:  \
+            ℕ ~ <PosInt 10 BigEndian> ~ <Seq~<ValueTerminated 0> <Digit 10>~Char~Ascii~native.UInt8> \
+	    --> ℕ ~ native.UInt64 " \
+\
+     >| build/morphisms.h
+
+build/square: build build/morphisms.h
+	gcc -Os -I../../morphisms/runtime/include/ -Ibuild main.c -o build/square
+
+clean:
+	rm build/ -rf

morphisms/angle.morphism-base

@@ -3,70 +3,44 @@
 ```
 
 morph_angle_as_degrees_to_turns_float ()
-    Angle ~ Degrees ~ ℝ ~ native.Float
---> Angle ~ Turns ~ ℝ ~ native.Float
-```
-    *dst = *src / 360.0;
-    return 0;
-```
+    Angle ~ Degrees ~ ℝ ~ native.Float32
+--> Angle ~ Turns ~ ℝ ~ native.Float32
+```*dst = *src / 360.0;```
 
 morph_angle_as_degrees_to_turns_double ()
-    Angle ~ Degrees ~ ℝ ~ native.Double
---> Angle ~ Turns ~ ℝ ~ native.Double
-```
-    *dst = *src / 360.0;
-    return 0;
-```
+    Angle ~ Degrees ~ ℝ ~ native.Float64
+--> Angle ~ Turns ~ ℝ ~ native.Float64
+```*dst = *src / 360.0;```
 
 
 morph_angle_as_turns_to_degrees_float ()
-    Angle ~ Turns ~ ℝ ~ native.Float
---> Angle ~ Degrees ~ ℝ ~ native.Float
-```
-    *dst = *src * 360.0;
-    return 0;
-```
+    Angle ~ Turns ~ ℝ ~ native.Float32
+--> Angle ~ Degrees ~ ℝ ~ native.Float32
+```*dst = *src * 360.0;```
 
 morph_angle_as_turns_to_degrees_double ()
-    Angle ~ Turns ~ ℝ ~ native.Double
---> Angle ~ Degrees ~ ℝ ~ native.Double
-```
-    *dst = *src * 360.0;
-    return 0;
-```
-
-
+    Angle ~ Turns ~ ℝ ~ native.Float64
+--> Angle ~ Degrees ~ ℝ ~ native.Float64
+```*dst = *src * 360.0;```
 
 
 morph_angle_as_radians_to_turns_float ()
-    Angle ~ Radians ~ ℝ ~ native.Float
---> Angle ~ Turns ~ ℝ ~ native.Float
-```
-    *dst = *src / PHI;
-    return 0;
-```
+    Angle ~ Radians ~ ℝ ~ native.Float32
+--> Angle ~ Turns ~ ℝ ~ native.Float32
+```*dst = *src / PHI;```
 
 morph_angle_as_radians_to_turns_double ()
-    Angle ~ Radians ~ ℝ ~ native.Double
---> Angle ~ Turns ~ ℝ ~ native.Double
-```
-    *dst = *src / PHI;
-    return 0;
-```
+    Angle ~ Radians ~ ℝ ~ native.Float64
+--> Angle ~ Turns ~ ℝ ~ native.Float64
+```*dst = *src / PHI;```
 
 
 morph_angle_as_turns_to_radians_float ()
-    Angle ~ Turns ~ ℝ ~ native.Float
---> Angle ~ Radians ~ ℝ ~ native.Float
-```
-    *dst = *src * PHI;
-    return 0;
-```
+    Angle ~ Turns ~ ℝ ~ native.Float32
+--> Angle ~ Radians ~ ℝ ~ native.Float32
+```*dst = *src * PHI;```
 
 morph_angle_as_degrees_to_radians_double ()
-    Angle ~ Turns ~ ℝ ~ native.Double
---> Angle ~ Radians ~ ℝ ~ native.Double
-```
-    *dst = *src * PHI;
-    return 0;
-```
+    Angle ~ Turns ~ ℝ ~ native.Float64
+--> Angle ~ Radians ~ ℝ ~ native.Float64
+```*dst = *src * PHI;```

morphisms/digit.morphism-base

@@ -60,8 +60,6 @@ morph_digit_as_uint8_to_char (Radix:ℤ_16)
         fprintf(stderr, "digit %u is out of rage for char\n", *dst);
         return -1;
     }
-
-    return 0;
 ```
 
 morph_digit_as_uint64_to_char (Radix:ℤ_16)
@@ -76,6 +74,4 @@ morph_digit_as_uint64_to_char (Radix:ℤ_16)
         fprintf(stderr, "digit %u is out of rage for char\n", *dst);
         return -1;
     }
-
-    return 0;
 ```

morphisms/length_prefix.morphism-base

@@ -7,11 +7,9 @@ morph_array_as_valterm_to_lenpfx (Terminator:native.UInt8)
     <Seq~<ValueTerminated Terminator> native.UInt8>
 --> <Seq~<LengthPrefix native.UInt64> native.UInt8>
 ```
-    length_prefix_uint64_t_array_uint8_t_clear(dst);
+    length_prefix_nativeUInt64_array_nativeUInt8_clear(dst);
     while( *src != Terminator )
-        length_prefix_uint64_t_array_uint8_t_push(dst, *src++);
-
-    return 0;
+        length_prefix_nativeUInt64_array_nativeUInt8_push(dst, *src++);
 ```
 
 
@@ -23,8 +21,6 @@ morph_array_as_lenpfx_to_valterm (Terminator:native.UInt8)
         *dst++ = src->items[i];
 
     *dst = Terminator;
-
-    return 0;
 ```
 
 morph_array_as_lenpfx_to_continuation_bit (T:Type)
@@ -40,8 +36,6 @@ morph_array_as_lenpfx_to_continuation_bit (T:Type)
 
         dst[i] = src->items[i];
         if( i+1 < src->len )
-            dst[i] |= (1<<(n_bits-1));
+            dst[i] |= ((uint64_t)1<<(n_bits-1));
     }
-
-    return 0;
 ```

morphisms/posint.morphism-base

@@ -11,7 +11,6 @@ morph_nat_as_u64_to_pos ()
 ```
     dst->len = 1;
     dst->items[0] = *src;
-    return 0;
 ```
 
 morph_nat_as_pos_to_u64 (Endianness:Type)
@@ -22,7 +21,6 @@ morph_nat_as_pos_to_u64 (Endianness:Type)
     ~ native.UInt64
 ```
     *dst = src->items[0];
-    return 0;
 ```
 
 morph_posint_radix_le (SrcRadix:ℤ, DstRadix:ℤ)
@@ -40,20 +38,18 @@ morph_posint_radix_le (SrcRadix:ℤ, DstRadix:ℤ)
         value += src->items[src->len - i - 1];
     }
 
-    length_prefix_uint64_t_array_uint64_t_clear( dst );
+    length_prefix_nativeUInt64_array_nativeUInt64_clear( dst );
 
     #if DstRadix==0
-        length_prefix_uint64_t_array_uint64_t_push( dst, value );
+        length_prefix_nativeUInt64_array_nativeUInt64_push( dst, value );
     #else
         if( value == 0 ) {
-            length_prefix_uint64_t_array_uint64_t_push( dst, 0 );
+            length_prefix_nativeUInt64_array_nativeUInt64_push( dst, 0 );
         } else while( value > 0 ) {
-            length_prefix_uint64_t_array_uint64_t_push( dst, value % DstRadix );
+            length_prefix_nativeUInt64_array_nativeUInt64_push( dst, value % DstRadix );
             value /= DstRadix;
         }
     #endif
-
-    return 0;
 ```
 
 morph_posint_radix_be (SrcRadix:ℤ, DstRadix:ℤ)
@@ -91,8 +87,6 @@ morph_posint_radix_be (SrcRadix:ℤ, DstRadix:ℤ)
             value /= DstRadix;
         }
     #endif
-
-    return 0;
 ```
 
 morph_posint_endianness (Radix:ℤ)
@@ -103,7 +97,7 @@ morph_posint_endianness (Radix:ℤ)
     ~ <PosInt Radix BigEndian>
     ~ <Seq~<LengthPrefix native.UInt64> <Digit Radix> ~ native.UInt64>
 ```
-    return length_prefix_uint64_t_array_uint64_t_reverse( src, dst );
+    return length_prefix_nativeUInt64_array_nativeUInt64_reverse( src, dst );
 ```
 
 morph_posint_endianness (Radix:ℤ)
@@ -114,5 +108,5 @@ morph_posint_endianness (Radix:ℤ)
     ~ <PosInt Radix LittleEndian>
     ~ <Seq~<LengthPrefix native.UInt64> <Digit Radix> ~ native.UInt64>
 ```
-    return length_prefix_uint64_t_array_uint64_t_reverse( src, dst );
+    return length_prefix_nativeUInt64_array_nativeUInt64_reverse( src, dst );
 ```

morphisms/real.morphism-base

@@ -4,102 +4,87 @@
 
 morph_real_as_decimalstr_to_float ()
     ℝ ~ <PosInt 10 BigEndian> ~ <Seq~<ValueTerminated 0> <Digit 10>~Char~Ascii~native.UInt8>
---> ℝ ~ native.Float
-```
-    sscanf(src, "%f", dst);
-    return 0;
-```
+--> ℝ ~ native.Float32
+```sscanf(src, "%f", dst);```
 
 morph_real_as_decimalstr_to_double ()
     ℝ ~ <PosInt 10 BigEndian> ~ <Seq~<ValueTerminated 0> <Digit 10>~Char~Ascii~native.UInt8>
---> ℝ ~ native.Double
-```
-    sscanf(src, "%lf", dst);
-    return 0;
-```
+--> ℝ ~ native.Float64
+```sscanf(src, "%lf", dst);```
 
 morph_real_as_float_to_decimalstr ()
-    ℝ ~ native.Float
+    ℝ ~ native.Float32
 --> ℝ ~ <PosInt 10 BigEndian> ~ <Seq~<ValueTerminated 0> <Digit 10>~Char~Ascii~native.UInt8>
-```
-    sprintf(dst, "%f", *src);
-    return 0;
-```
+```sprintf(dst, "%f", *src);```
 
 morph_real_as_double_to_decimalstr ()
-    ℝ ~ native.Double
+    ℝ ~ native.Float64
 --> ℝ ~ <PosInt 10 BigEndian> ~ <Seq~<ValueTerminated 0> <Digit 10>~Char~Ascii~native.UInt8>
-```
-    sprintf(dst, "%f", *src);
-    return 0;
-```
-
+```sprintf(dst, "%f", *src);```
 
 morph_real_as_float_to_double ()
-    ℝ ~ native.Float
---> ℝ ~ native.Double
-```
-    *dst = *src;
-    return 0;
-```
+    ℝ ~ native.Float32
+--> ℝ ~ native.Float64
+```*dst = *src;```
 
 morph_real_as_double_to_float ()
-    ℝ ~ native.Double
---> ℝ ~ native.Float
+    ℝ ~ native.Float64
+--> ℝ ~ native.Float32
 ```
     fprintf(stderr, "Warning: morphin Double -> Float. Precision loss!");
     *dst = *src;
-    return 0;
 ```
 
 morph_real_as_u64_to_float ()
     ℝ ~ ℕ ~ native.UInt64
---> ℝ ~ native.Float
+--> ℝ ~ native.Float32
 ```
     fprintf(stderr, "Warning: morphin UInt64 -> Float. Precision loss!");
     *dst = *src;
-    return 0;
 ```
 
 morph_real_as_u64_to_double ()
     ℝ ~ ℕ ~ native.UInt64
---> ℝ ~ native.Double
+--> ℝ ~ native.Float64
 ```
     fprintf(stderr, "Warning: morphin UInt64 -> Double. Precision loss!");
     *dst = *src;
-    return 0;
+```
+
+
+morph_real_as_nat_to_quantized_linear ()
+     ℝ ~ ℕ ~ native.UInt64
+-->  ℝ ~ <QuantizedLinear 0 1 1> ~ ℕ ~ native.UInt64
+```
+    *dst = *src;
 ```
 
 morph_real_as_quantized_linear_to_float (Begin: ℝ, End: ℝ, Steps: ℤ)
     ℝ ~ <QuantizedLinear Begin End Steps> ~ ℕ ~ native.UInt64
---> ℝ ~ native.Float
+--> ℝ ~ native.Float32
 ```
     *dst = (float)Begin  +  ( *src * ((float)End - (float)Begin) ) / (float)Steps;
-    return 0;
 ```
 
 morph_real_as_float_to_quantized_linear (Begin: ℝ, End: ℝ, Steps: ℤ)
-    ℝ ~ native.Float
+    ℝ ~ native.Float32
 --> ℝ ~ <QuantizedLinear Begin End Steps> ~ ℕ ~ native.UInt64
 ```
     *dst = ((*src - (float)Begin) * (float)Steps) / ((float)End - (float)Begin);
-    return 0;
 ```
 
 
 
 morph_real_as_quantized_linear_to_double (Begin: ℝ, End: ℝ, Steps: ℤ)
     ℝ ~ <QuantizedLinear Begin End Steps> ~ ℕ ~ native.UInt64
---> ℝ ~ native.Double
+--> ℝ ~ native.Float64
 ```
     *dst = (double)Begin  +  ( *src * ((double)End - (double)Begin) ) / (double)Steps;
-    return 0;
 ```
 
 morph_real_as_double_to_quantized_linear (Begin: ℝ, End: ℝ, Steps: ℤ)
-    ℝ ~ native.Double
+    ℝ ~ native.Float64
 --> ℝ ~ <QuantizedLinear Begin End Steps> ~ ℕ ~ native.UInt64
 ```
     *dst = ((*src - (double)Begin) * (double)Steps) / ((double)End - (double)Begin);
-    return 0;
 ```

morphisms/runtime/include/array/length-prefix.h

@@ -2,27 +2,37 @@
 
 #include <stdio.h>
 #include <stdint.h>
-
-#define DEFINE_LENGTH_PREFIX_ARRAY(LEN_TYPE, ITEM_TYPE)                        \
+/*
 typedef struct {                                                           \
     LEN_TYPE len;                                                          \
     ITEM_TYPE items[];                                                     \
-    } LengthPrefix_##LEN_TYPE##_Array_##ITEM_TYPE;                             \
-                                                                               \
-    static inline void length_prefix_##LEN_TYPE##_array_##ITEM_TYPE##_clear(   \
-        LengthPrefix_##LEN_TYPE##_Array_##ITEM_TYPE *data) {                   \
+} __Seq__LengthPrefix_##LEN_TYPE##___##ITEM_TYPE##_;                       \
+  */                                                                       \
+
+#define LENGTH_PREFIX_ARRAY_TYPE(LEN_TYPE, ITEM_TYPE)                           \
+    __Seq__LengthPrefix_##LEN_TYPE##___##ITEM_TYPE##_
+
+#define LENGTH_PREFIX_ARRAY_CALL(LEN_TYPE, ITEM_TYPE, METHOD)              \
+    length_prefix_##LEN_TYPE##_array_##ITEM_TYPE##_ ## METHOD
+
+#define PRESCAN_LENGTH_PREFIX_CALL(LEN, ITEM, METHOD) \
+    LENGTH_PREFIX_ARRAY_CALL(LEN, ITEM, METHOD)
+
+#define DEFINE_LENGTH_PREFIX_ARRAY(LEN_TYPE, ITEM_TYPE)                        \
+    static inline void PRESCAN_LENGTH_PREFIX_CALL(LEN_TYPE, ITEM_TYPE, clear)    \
+       (__Seq__LengthPrefix_##LEN_TYPE##___##ITEM_TYPE##_ *data) {                      \
         data->len = 0;                                                         \
     }                                                                          \
                                                                                \
-    static inline void length_prefix_##LEN_TYPE##_array_##ITEM_TYPE##_push(    \
-        LengthPrefix_##LEN_TYPE##_Array_##ITEM_TYPE *data,                     \
+    static inline void PRESCAN_LENGTH_PREFIX_CALL(LEN_TYPE, ITEM_TYPE, push)     \
+       (__Seq__LengthPrefix_##LEN_TYPE##___##ITEM_TYPE##_ *data,                        \
         ITEM_TYPE value) {                                                     \
         data->items[data->len++] = value;                                      \
     }                                                                          \
                                                                                \
-    static inline int length_prefix_##LEN_TYPE##_array_##ITEM_TYPE##_reverse(  \
-        LengthPrefix_##LEN_TYPE##_Array_##ITEM_TYPE const * restrict src,      \
-        LengthPrefix_##LEN_TYPE##_Array_##ITEM_TYPE *restrict dst) {           \
+    static inline int PRESCAN_LENGTH_PREFIX_CALL(LEN_TYPE, ITEM_TYPE, reverse)   \
+      ( __Seq__LengthPrefix_##LEN_TYPE##___##ITEM_TYPE##_ const * restrict src,         \
+        __Seq__LengthPrefix_##LEN_TYPE##___##ITEM_TYPE##_ *restrict dst) {              \
         for (LEN_TYPE i = 0; i < src->len; i++) {                              \
             dst->items[i] = src->items[src->len - 1 - i];                      \
         }                                                                      \
@@ -30,60 +40,11 @@
         return 0;                                                              \
     }                                                                          \
                                                                                \
-    static inline void length_prefix_##LEN_TYPE##_array_##ITEM_TYPE##_dump(    \
-        LengthPrefix_##LEN_TYPE##_Array_##ITEM_TYPE const * data) {            \
+    static inline void PRESCAN_LENGTH_PREFIX_CALL(LEN_TYPE, ITEM_TYPE, dump)     \
+      ( __Seq__LengthPrefix_##LEN_TYPE##___##ITEM_TYPE##_ const * data) {               \
         printf("Length: %llu\n", (unsigned long long) data->len);              \
         for (LEN_TYPE i = 0; i < data->len; i++) {                             \
             printf("%llu ", (unsigned long long) data->items[i]);              \
         }                                                                      \
         printf("\n");                                                          \
     }
-
-#define DEFINE_ALL_LENGTH_PREFIX_ARRAYS(LEN_TYPE)  \
-    DEFINE_LENGTH_PREFIX_ARRAY(LEN_TYPE, uint8_t)  \
-    DEFINE_LENGTH_PREFIX_ARRAY(LEN_TYPE, uint16_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY(LEN_TYPE, uint32_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY(LEN_TYPE, uint64_t)
-
-DEFINE_ALL_LENGTH_PREFIX_ARRAYS(uint8_t)
-DEFINE_ALL_LENGTH_PREFIX_ARRAYS(uint16_t)
-DEFINE_ALL_LENGTH_PREFIX_ARRAYS(uint32_t)
-DEFINE_ALL_LENGTH_PREFIX_ARRAYS(uint64_t)
-
-
-#define DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, SRC_ITEM_TYPE, DST_ITEM_TYPE) \
-    static inline int length_prefix_##LEN_TYPE##_array_map_##SRC_ITEM_TYPE##_to_##DST_ITEM_TYPE( \
-        int (*f)(SRC_ITEM_TYPE const * restrict, DST_ITEM_TYPE * restrict),    \
-        LengthPrefix_##LEN_TYPE##_Array_##SRC_ITEM_TYPE const * restrict src,  \
-        LengthPrefix_##LEN_TYPE##_Array_##DST_ITEM_TYPE * restrict dst)        \
-    {                                                                          \
-        if (dst->len < src->len) return -1; /* Ensure enough space */          \
-        for (LEN_TYPE i = 0; i < src->len; i++) {                              \
-            if (f(&src->items[i], &dst->items[i]) != 0) return -1;             \
-        }                                                                      \
-        dst->len = src->len;                                                   \
-        return 0;                                                              \
-    }
-
-#define DEFINE_ALL_MAPS(LEN_TYPE)                        \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint8_t, uint8_t)   \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint8_t, uint16_t)  \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint8_t, uint32_t)  \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint8_t, uint64_t)  \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint16_t, uint8_t)  \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint16_t, uint16_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint16_t, uint32_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint16_t, uint64_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint32_t, uint8_t)  \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint32_t, uint16_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint32_t, uint32_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint32_t, uint64_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint64_t, uint8_t)  \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint64_t, uint16_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint64_t, uint32_t) \
-    DEFINE_LENGTH_PREFIX_ARRAY_MAP(LEN_TYPE, uint64_t, uint64_t)
-
-DEFINE_ALL_MAPS(uint8_t)
-DEFINE_ALL_MAPS(uint16_t)
-DEFINE_ALL_MAPS(uint32_t)
-DEFINE_ALL_MAPS(uint64_t)

morphisms/temperature.morphism-base

@@ -2,33 +2,21 @@
 ```
 
 morph_celsius_to_kelvin ()
-      Temperature ~ Celsius ~ ℝ ~ native.Float
--->   Temperature ~ Kelvin ~ ℝ ~ native.Float
-```
-    *dst = *src + 273.15;
-    return 0;
-```
+      Temperature ~ Celsius ~ ℝ ~ native.Float32
+-->   Temperature ~ Kelvin ~ ℝ ~ native.Float32
+```*dst = *src + 273.15;```
 
 morph_kelvin_to_celsius ()
-      Temperature ~ Kelvin ~ ℝ ~ native.Float
--->   Temperature ~ Celsius ~ ℝ ~ native.Float
-```
-    *dst = *src - 273.15;
-    return 0;
-```
+      Temperature ~ Kelvin ~ ℝ ~ native.Float32
+-->   Temperature ~ Celsius ~ ℝ ~ native.Float32
+```*dst = *src - 273.15;```
 
 morph_celsius_to_fahrenheit ()
-      Temperature ~ Celsius ~ ℝ ~ native.Float
--->   Temperature ~ Fahrenheit ~ ℝ ~ native.Float
-```
-    *dst = (*src * 9.0 / 5.0) + 32.0;
-    return 0;
-```
+      Temperature ~ Celsius ~ ℝ ~ native.Float32
+-->   Temperature ~ Fahrenheit ~ ℝ ~ native.Float32
+```*dst = (*src * 9.0 / 5.0) + 32.0;```
 
 morph_fahrenheit_to_celsius ()
-      Temperature ~ Fahrenheit ~ ℝ ~ native.Float
--->   Temperature ~ Celsius ~ ℝ ~ native.Float
-```
-    *dst = (*src - 32.0) * 5.0 / 9.0;
-    return 0;
-```
+      Temperature ~ Fahrenheit ~ ℝ ~ native.Float32
+-->   Temperature ~ Celsius ~ ℝ ~ native.Float32
+```*dst = (*src - 32.0) * 5.0 / 9.0;```

morphisms/timepoint.morphism-base

@@ -11,5 +11,4 @@ morph_unixtime_to_iso ()
     if (!timeinfo) return -1;
 
     strftime((char*)dst, 20, "%Y-%m-%dT%H:%M:%SZ", timeinfo);
-    return 0;
 ```

morphisms/uint.morphism-base

@@ -0,0 +1,17 @@
+```
+```
+
+morph_nat_as_u8_to_u16 ()
+      ℕ ~ native.UInt8
+-->   ℕ ~ native.UInt16
+```*dst = *src;```
+
+morph_nat_as_u16_to_u32 ()
+      ℕ ~ native.UInt16
+-->   ℕ ~ native.UInt32
+```*dst = *src;```
+
+morph_nat_as_u32_to_u64 ()
+      ℕ ~ native.UInt32
+-->   ℕ ~ native.UInt64
+```*dst = *src;```

morphisms/unicode.morphism-base

@@ -28,7 +28,6 @@ morph_string_as_utf8_to_ascii ()
         }
     }
     *dst = 0;
-    return 0;
 ```
 
 morph_string_as_ascii_to_utf32 ()
@@ -39,7 +38,6 @@ morph_string_as_ascii_to_utf32 ()
 ```
     while( *src ) { *dst++ = *src++; }
     *dst = 0;
-    return 0;
 ```
 
 morph_string_as_utf8_to_utf32 ()
@@ -89,6 +87,4 @@ morph_string_as_utf8_to_utf32 ()
         *dst++ = val;
 
     *dst++ = 0;
-
-    return 0;
 ```

morphisms/value_delim.morphism-base

@@ -12,23 +12,21 @@ morph_seqseq_valsep_uint8 (T: Type, SrcDelim: T, DstDelim: T)
     ~ < ValueSep DstDelim T >
     ~ < Seq~<LengthPrefix native.UInt64> T >
 ```
-    length_prefix_uint64_t_array_uint8_t_clear( dst );
+    PRESCAN_LENGTH_PREFIX_CALL(nativeUInt64, T, clear)( dst );
 
     uint8_t * dst_items = dst->items;
     for( uint64_t i = 0; i < src->len; ++i ) {
         if( src->items[i] == SrcDelim ) {
-            length_prefix_uint64_t_array_uint8_t_push( dst, DstDelim );
+            PRESCAN_LENGTH_PREFIX_CALL(nativeUInt64, T, push)( dst, DstDelim );
         } else if( src->items[i] == DstDelim ) {
             if( DstDelim == '\n' ) {
-                length_prefix_uint64_t_array_uint8_t_push( dst, '\\' );
-                length_prefix_uint64_t_array_uint8_t_push( dst, 'n' );
+                PRESCAN_LENGTH_PREFIX_CALL(nativeUInt64, T, push)( dst, '\\' );
+                PRESCAN_LENGTH_PREFIX_CALL(nativeUInt64, T, push)( dst, 'n' );
             }
         } else {
-            length_prefix_uint64_t_array_uint8_t_push( dst, src->items[i] );
+            PRESCAN_LENGTH_PREFIX_CALL(nativeUInt64, T, push)( dst, src->items[i] );
         }
     }
-
-    return 0;
 ```
 
 
@@ -44,9 +42,9 @@ morph_seqseq_as_valsep_to_lenpfx (T: Type, Delim: T, EscKey: T)
         ~ native.UInt64
     >
 ```
-    length_prefix_uint64_t_array_uint64_t_clear( dst );
+    length_prefix_nativeUInt64_array_nativeUInt64_clear( dst );
 
-    struct LengthPrefix_uint64_t_Array_uint8_t * cur_item = NULL;
+    struct LengthPrefix_nativeUInt64_Array_nativeUInt8 * cur_item = NULL;
 
     uint8_t const * start = &src->items[0];
     uint8_t const * cur = start;
@@ -60,14 +58,12 @@ morph_seqseq_as_valsep_to_lenpfx (T: Type, Delim: T, EscKey: T)
             cur_item->len = len;
             memcpy( cur_item->items, start, len );
 
-            length_prefix_uint64_t_array_uint64_t_push( dst, (uint64_t)cur_item );
+            length_prefix_nativeUInt64_array_nativeUInt64_push( dst, (uint64_t)cur_item );
             start = ++cur;
         } else {
             cur++;
         }
     }
-
-    return 0;
 ```
 
 morph_seqeq_as_lenpfx_to_valsep (T: Type, Delim: T, EscKey: T)
@@ -81,19 +77,17 @@ morph_seqeq_as_lenpfx_to_valsep (T: Type, Delim: T, EscKey: T)
     ~ < ValueSep T Delim >
     ~ < Seq~<LengthPrefix native.UInt64> T >
 ```
-    length_prefix_uint64_t_array_uint8_t_clear( dst );
+    length_prefix_nativeUInt64_array_nativeUInt8_clear( dst );
 
     for( uint64_t i = 0; i < src->len; ++i ) {
-        LengthPrefix_uint64_t_Array_uint8_t * item = src->items[i];
+        LengthPrefix_nativeUInt64_Array_nativeUInt8_t * item = src->items[i];
 
         for( uint64_t j = 0; j < item->len; ++j ) {
-            length_prefix_uint64_t_array_uint8_t_push( items->items[j] );
+            length_prefix_nativeUInt64_array_nativeUInt8_push( items->items[j] );
         }
 
         if( i+1 < src->len ) {
-            length_prefix_uint64_t_array_uint8_t_push( Delim );
+            length_prefix_nativeUInt64_array_nativeUInt8_push( Delim );
         }
     }
-
-    return 0;
 ```

morphisms/zigzag.morphism-base

@@ -10,8 +10,6 @@ morph_i64_as_twos_complement_to_zigzag ()
     } else {
         *dst = (2 * (uint64_t)(- *src)) - 1;
     }
-
-    return 0;
 ```
 
 morph_i64_as_zigzag_to_twos_complement ()

platforms/json.lt

@@ -0,0 +1,100 @@
+
+type UTF8-String = <Seq Char~Unicode> ~ UTF-8 ~ <Seq~<ValueTerminated 0> native.UInt8> ;
+
+type SerializedJson.Value = json.Value
+    ~ <Enum
+        <Null   json.Null ~ SerializedJson.Null >
+        <String json.String ~ SerializedJson.String >
+        <Number json.Number ~ SerializedJson.Number >
+        <Bool   json.Bool ~ SerializedJson.Bool >
+        <Array  json.Array ~ SerializedJson.Array >
+        <Object json.Object ~ SerializedJson.Object >>
+    ~ <Seq Char> ;
+
+type SerializedJson.Null = < Struct~<Seq Char> "\"null\"" > ;
+
+type SerializedJson.String = <Seq Char>
+                           ~ <Struct~<Seq Char> "\"" <Seq Char> "\"">
+                           ~ <Seq Char> ;
+
+type SerializedJson.Number = ℝ
+                           ~ <PosInt 10 BigEndian>
+                           ~ <Seq <Digit 10> ~ Char> ;
+
+type SerializedJson.Bool   = Bool
+                           ~ <Enum~<Seq Char>
+                                <True~"\"true\"" <>>
+                                <False~"\"false\"" <>>>
+                           ~ <Seq Char> ;
+
+type SerializedJson.Array  = <Struct~<Seq Char>
+                                "["
+                                    <Seq json.Value>
+                                  ~ <ValueSep ',' Char>
+                                  ~ <Seq Char>
+                                "]" >
+                            ~ <Seq Char> ;
+
+type SerializedJson.Object = <Struct~<Seq Char>
+                                "{"
+                                <members <Seq
+                                            <Struct~<Seq Char>
+                                                <key json.String>
+                                                ":"
+                                                <value json.Value>>>>
+                                "}"
+                             >
+                           ~ <Seq Char>;
+
+type parsedJson.Value = json.Value ~ <Enum~native.UInt8
+        < parsedJson_Null~0     <> >
+        < parsedJson_String~1   <Ref UTF8-String> ~ native.Address >
+        < parsedJson_Int~2      ℝ~ℕ~native.UInt64 >
+        < parsedJson_Float~2    ℝ~native.Float64 >
+        < parsedJson_Bool~3     Bool ~ native.UInt8 >
+
+        < parsedJson_Array~4    <Ref <Seq ~ <LengthPrefix native.UInt64>
+                                        parsedJsonValue
+                                     >
+                                >
+                                ~ native.Address >
+
+        < parsedJson_Object~5   <Ref <Seq ~ <LengthPrefix native.UInt64>
+                                        <Struct
+                                            <key <Ref UTF8-String> ~ native.Address>
+                                            <val parsedJsonValue>
+                                        >
+                                >
+                                ~ native.Address >>
+    ~ <Struct
+        <tag native.UInt8>
+        native.UInt64      >;
+
+parse_json_value ()
+    json.Value ~ UTF8-String
+--> json.Value ~ parsedJsonValue
+```
+
+    {
+        dst->tag = PARSED_JSON_NULL;
+        dst->parsedJson_Null;
+    }
+
+    {
+        dst->tag = PARSED_JSON_STRING;
+        dst->parsedJson_String = malloc(len);
+        strncpy(dst->parsedJson_String, src, len);
+        src += len;
+    }
+
+    {
+        dst->tag = PARSED_JSON_NUMBER;
+
+        MORPH(
+            "ℝ ~ ℕ ~ <PosInt 10 BigEndian> ~ <Seq <Digit 10> ~ Char> ~ UTF8-String",
+            "ℝ ~ ℕ ~ native.UInt64",
+            src,
+            &dst->parsedJson_Number
+        );
+    }
+```

platforms/protobuf.lt

@@ -0,0 +1,3 @@
+
+type protobuf.Varint = ℕ ~ <PosInt 128 LittleEndian> ~ <Seq~MsbCont <Digit 128> ~ ℤ_128 ~ native.UInt8> ;
+type protobuf.String = <Seq Char ~ Unicode> ~ UTF-8 ~ <Seq ~ <LengthPrefix protobuf.Varint> Byte> ;

platforms/x86.lt

@@ -0,0 +1,5 @@
+
+type x86.UInt64 = ℤ_2/\64 ~ <PosInt 256 LittleEndian> ~ <Seq~<StaticLength 8> <Digit 256> ~ x86.UInt8 >;
+type x86.UInt32 = ℤ_2/\32 ~ <PosInt 256 LittleEndian> ~ <Seq~<StaticLength 4> <Digit 256> ~ x86.UInt8 >;
+type x86.UInt16 = ℤ_2^16 ~ <PosInt 256 LittleEndian> ~ <Seq~<StaticLength 2> <Digit 256> ~ x86.UInt8 >;
+type x86.UInt8 = ℤ_256 ~ <Posint 2 BigEndian> ~ <Seq~<StaticLength 8> <Digit 2> ~ Bit>;

src/c_gen.rs

@@ -1,419 +0,0 @@
-use {
-    laddertypes::{TypeDict, TypeTerm, parser::*, unparser::*, morphism::{Morphism, MorphismInstance}},
-    crate::morphism::{LdmcPrimCMorphism, LdmcMorphism}
-};
-
-/*
-*/
-pub fn get_c_repr_kind(kind: String) -> Option<String> {
-    match kind.as_str() {
-        "ℤ" => Some("uint64_t".into()),
-        _ => None
-    }
-}
-
-/* for a given ladder type `t`, get the corresponding C type
- */
-pub fn get_c_repr_type(dict: &mut impl TypeDict, t: laddertypes::TypeTerm, skip_pointer: bool) -> Option<String> {
-    let lnf = t.normalize().decurry().get_lnf_vec();
-
-    match lnf.last() {
-        Some(t) => {
-            if t == &dict.parse("Byte").expect("parse")
-            || t == &dict.parse("native.UInt8").expect("parse")
-            || t == &dict.parse("<StaticLength 8 Bit>").expect("parse")
-            {
-                Some("uint8_t".into())
-            } else if t == &dict.parse("native.UInt16").expect("parse") {
-                Some("uint16_t".into())
-            } else if t == &dict.parse("native.UInt32").expect("parse") {
-                Some("uint32_t".into())
-            } else if t == &dict.parse("native.UInt64").expect("parse") {
-                Some("uint64_t".into())
-            } else if t == &dict.parse("native.Float").expect("parse") {
-                Some("float".into())
-            } else if t == &dict.parse("native.Double").expect("parse") {
-                Some("double".into())
-            } else {
-                match t {
-                    laddertypes::TypeTerm::App(args) => {
-                        if args[0] == laddertypes::TypeTerm::TypeID(dict.get_typeid(&"LengthPrefix".into()).unwrap())
-                        {
-                            let length_c_type : String = get_c_repr_type(dict, args[1].clone(), false)?;
-                            let item_c_type : String = get_c_repr_type(dict, args[2].clone(), false)?;
-
-                            match length_c_type.as_str() {
-                                "uint8_t" |
-                                "uint16_t" |
-                                "uint32_t" |
-                                "uint64_t" => {}
-                                _ => {
-                                    eprintln!("invalid length type!");
-                                    return None;
-                                }
-                            }
-                            match item_c_type.as_str() {
-                                "uint8_t" |
-                                "uint16_t" |
-                                "uint32_t" |
-                                "uint64_t" => {}
-                                _ => {
-                                    eprintln!("invalid item type!");
-                                    return None;
-                                }
-                            }
-
-                            Some(format!("LengthPrefix_{}_Array_{}", length_c_type, item_c_type))
-                        }
-                        else if args[0] == laddertypes::TypeTerm::TypeID(dict.get_typeid(&"ValueTerminated".into()).unwrap())
-                        {
-                            let _delim_val = args[1].clone();
-                            let c_type = get_c_repr_type(dict, args[2].clone(), false)?;
-                            if skip_pointer {
-                                Some(c_type)
-                            } else {
-                                Some(format!("{} *", c_type))
-                            }
-                        }
-                        else if args[0] == laddertypes::TypeTerm::TypeID(dict.get_typeid(&"MsbCont".into()).unwrap())
-                        {
-                            let c_type = get_c_repr_type(dict, args[1].clone(), false)?;
-                            if skip_pointer {
-                                Some(c_type)
-                            } else {
-                                Some(format!("{} *", c_type))
-                            }
-                        }
-                        else {
-                            None
-                        }
-                    }
-
-                    _ => None
-                }
-            }
-        }
-        None => None
-    }
-}
-
-
-pub fn encode_type_to_symbol(dict: &mut impl TypeDict, t: &laddertypes::TypeTerm)-> String {
-    match t {
-        laddertypes::TypeTerm::Char(c) => {
-            match c {
-                '.' => format!("_dot_"),
-                _ =>
-                format!("{}", (*c as u64))
-            }
-        },
-        laddertypes::TypeTerm::Num(n) => {
-            format!("{}", n)
-        }
-        laddertypes::TypeTerm::TypeID(ty_id) => {
-            if let Some(name) = dict.get_typename(ty_id) {
-                format!("{}", name.replace(".", "_dot_"))
-            } else {
-                format!("")
-            }
-        }
-        laddertypes::TypeTerm::Ladder(rs) |
-        laddertypes::TypeTerm::App(rs) => {
-            let mut s = String::new();
-            for r in rs {
-                s.push('_');
-                s.push_str(&encode_type_to_symbol(dict, r));
-            }
-            s
-        }
-    }
-}
-
-pub fn encode_type_to_value(dict: &mut impl TypeDict, t: &laddertypes::TypeTerm) -> String {
-    dict.unparse(t)
-}
-
-
-pub fn generate_main(type_dict: &mut impl TypeDict, path: Vec<MorphismInstance<LdmcMorphism>>, src_type: TypeTerm, dst_type: TypeTerm) {
-    let mut i = 0;
-
-    /* todo: collect include files from morphism base */
-    println!(r#"
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <stdint.h>
-#include <stdbool.h>
-"#);
-
-    let mut existing_instantiations = Vec::new();
-    for morph_inst in path.iter() {
-        match &morph_inst.m {
-            LdmcMorphism::Primitive( item_morph ) => {
-                let name = item_morph.instantiated_symbol_name(type_dict, &morph_inst.σ);
-                if ! existing_instantiations.contains(&name) {
-                    if let Some(s) = item_morph.generate_instantiation(type_dict, &morph_inst.σ) {
-                        println!("{}", s);
-                    } else {
-                        eprintln!("couldnt generate instance {}", name);
-                    }
-                    existing_instantiations.push( name );
-                }
-            }
-            LdmcMorphism::LengthPrefixMap { length_prefix_type, item_morph } => {
-                let name = item_morph.instantiated_symbol_name(type_dict, &morph_inst.σ);
-                if ! existing_instantiations.contains(&name) {
-                    if let Some(s) = item_morph.generate_instantiation(type_dict, &morph_inst.σ) {
-                        println!("{}", s);
-                    } else {
-                        eprintln!("couldnt generate instance {}", name);
-                    }
-
-                    existing_instantiations.push( name );
-                }
-            }
-            _ => {}
-        }
-    }
-
-    println!(r#"
-int main() {{
-uint8_t bufA[128];
-uint8_t bufB[128];
-
-memset(bufA, 0, sizeof(bufA));
-memset(bufB, 0, sizeof(bufB));
-
-char in_str[] = "read :: {} \n";
-char out_str[]= "write:: {} \n";
-write(2, in_str, strlen(in_str));
-write(2, out_str, strlen(out_str));
-
-int l = read(0, bufA, sizeof(bufA));
-//fprintf(stderr, "read  %d bytes\n", l);
-
-        "#,
-        type_dict.unparse(&src_type).replace("\\", "\\\\"),
-        type_dict.unparse(&dst_type).replace("\\", "\\\\") );
-
-    for morph_inst in path.iter() {
-        println!(r#"
-/* morph to {}
-
-...with
-morph {}
----> {},
-subst σ = {:?},
-halo  Ψ = {}
-*/"#,
-            type_dict.unparse(&morph_inst.get_type().dst_type.param_normalize().decurry()),
-            type_dict.unparse(&morph_inst.m.get_type().src_type),
-            type_dict.unparse(&morph_inst.m.get_type().dst_type),
-            morph_inst.σ,
-            type_dict.unparse(&morph_inst.halo),
-        );
-        morph_inst.m.generate_call(type_dict, &morph_inst.σ, i);
-        i += 1;
-    }
-
-    let out_buf = if i%2==0 { "bufA" } else { "bufB" };
-
-    let is_string = false;
-    if let Ok((halo, σ)) = laddertypes::subtype_unify(
-        &dst_type,
-        &type_dict.parse("<Seq~<ValueTerminated 0> native.UInt8>").unwrap()
-    ) {
-        println!(r#"
-printf("%s\n", {});"#, out_buf);
-    } else if let Ok((halo, σ)) = laddertypes::subtype_unify(
-        &dst_type,
-        &type_dict.parse("<Seq~<LengthPrefix native.UInt64> native.UInt8>").unwrap()
-    ) {
-        println!(r#"
-        /* write output
-         */
-        {{
-            LengthPrefix_uint64_t_Array_uint8_t * buf = (void*){};
-            write(1, {}, sizeof(uint64_t) + buf->len);
-        }}"#, out_buf, out_buf);
-    } else {
-        println!(r#"
-write(1, {}, sizeof({}));"#,
-            out_buf,
-            out_buf
-        );
-    }
-
-
-    println!(r#"
-return 0;
-}}
-    "#);
-
-    eprintln!("Success: generated C code");
-}
-
-impl LdmcPrimCMorphism {
-    pub fn instantiated_symbol_name(&self, dict: &mut impl TypeDict,
-        σ: &std::collections::HashMap<laddertypes::TypeID, laddertypes::TypeTerm>) -> String {
-        let mut s = self.symbol.clone();
-        for (k_id,v) in self.type_args.iter() {
-            if let Some(val_trm) = σ.get(k_id) {
-                if let laddertypes::TypeID::Var(var_id) = k_id {
-                    let name = dict.get_varname(*var_id).unwrap();
-                    let val_str = encode_type_to_symbol(dict, val_trm);
-                    s.push_str(&format!("_{}_{}", name, val_str));
-                }
-            } else {
-                if let laddertypes::TypeID::Var(var_id) = k_id {
-                    let k = dict.get_varname(*var_id).unwrap();
-                    s.push_str(&format!("_{:?}_MISSING", k));
-                    eprintln!("INCOMPLETE MORPHISM INSTANTIATION, missing {} ({})", k, var_id);
-                }
-            }
-        }
-        s
-    }
-
-    pub fn expected_c_type_signature(&self, dict: &mut impl TypeDict,
-        σ: &std::collections::HashMap<laddertypes::TypeID, laddertypes::TypeTerm>) -> String {
-        format!("int {} ({} const * restrict src, {} * restrict dst);",
-            self.instantiated_symbol_name(dict, σ),
-            get_c_repr_type(dict, self.src_type.clone(), true).expect("cant get c-repr type for src type"),
-            get_c_repr_type(dict, self.dst_type.clone(), true).expect("cant get c-repr type for dst type"))
-    }
-
-    pub fn generate_instantiation(&self, dict: &mut impl TypeDict, σ: &std::collections::HashMap<laddertypes::TypeID, laddertypes::TypeTerm>) -> Option<String> {
-        let mut s = String::new();
-
-        s.push_str(&format!(r#"
-int {} ( {} const * restrict src, {} * restrict dst ) {{
-"#,
-            self.instantiated_symbol_name(dict, &σ),
-            get_c_repr_type(dict, self.src_type.clone().apply_substitution(&|k| σ.get(k).cloned()).clone(), true).expect("cant get c-repr-type"),
-            get_c_repr_type(dict, self.dst_type.clone().apply_substitution(&|k| σ.get(k).cloned()).clone(), true).expect("cant get c-repr-type"),
-        ));
-        for (ty_id, kind) in self.type_args.iter() {
-            if let Some(val) = σ.get(ty_id) {
-                eprintln!("val = {}", dict.unparse(&val));
-
-                let type_var_value =
-                    if let Some(c_repr_type) = get_c_repr_type(dict, val.clone(), true) {
-                        c_repr_type
-                    } else {
-                        encode_type_to_value(dict, val)
-                    };
-
-                s.push_str(&format!("    #define {} {}\n", dict.get_typename(&ty_id).unwrap(), type_var_value));
-            }
-        }
-
-        s.push_str(&self.c_source);
-
-        for (ty_id, kind) in self.type_args.iter() {
-            s.push_str(&format!("\n    #undef {}", dict.get_typename(&ty_id).unwrap()));
-        }
-
-        s.push_str(&format!(r#"
-}}
-"#));
-        Some(s)
-    }
-}
-
-impl LdmcMorphism {
-    pub fn generate_call(&self, dict: &mut impl TypeDict, σ: &std::collections::HashMap<laddertypes::TypeID, laddertypes::TypeTerm>, i: u64) {
-        match self {
-            LdmcMorphism::Primitive(prim_morph) => {
-                let src_c_type = get_c_repr_type(dict, prim_morph.src_type.clone().apply_substitution(&|k| σ.get(k).cloned()).clone(), true).expect("cant get c-repr type for src type");
-                let dst_c_type = get_c_repr_type(dict, prim_morph.dst_type.clone().apply_substitution(&|k| σ.get(k).cloned()).clone(), true).expect("cant get c-repr type for dst type");
-
-                let src_buf = if i%2 == 0 { "bufA" } else { "bufB" };
-                let dst_buf = if i%2 == 0 { "bufB" } else { "bufA" };
-
-                println!(r#"
-    {}
-            {} const * restrict src = (void*) {};
-            {} * restrict dst = (void*) {};
-            {} ( src, dst );
-    {}"#,
-                    '{',
-                    src_c_type, src_buf,
-                    dst_c_type, dst_buf,
-                    prim_morph.instantiated_symbol_name(dict, σ),
-                    '}');
-            }
-            LdmcMorphism::LengthPrefixMap { length_prefix_type, item_morph } => {
-                let src_type = self.get_type().src_type.clone().apply_substitution(&|k| σ.get(k).cloned()).clone();
-                let dst_type = self.get_type().dst_type.clone().apply_substitution(&|k| σ.get(k).cloned()).clone();
-
-                eprintln!("length prefix type ={:?}", length_prefix_type);
-                eprintln!("src_type ={:?}", src_type);
-                eprintln!("dst_type = {:?}", dst_type);
-
-                dict.add_varname("S".into());
-
-                let γ_src = laddertypes::unify(
-                    &dict.parse("<Seq~<LengthPrefix S> T>").expect("parse template"),
-                    &src_type
-                ).expect("cant get src item type");
-
-                let γ_dst = laddertypes::unify(
-                    &dict.parse("<Seq~<LengthPrefix S> T>").expect("parse template"),
-                    &dst_type
-                ).expect("cant get dst item type");
-
-                let src_length_type = γ_src.get(&dict.get_typeid(&"S".into()).unwrap()).expect("cant get src-length type").clone();
-                let dst_length_type = γ_src.get(&dict.get_typeid(&"S".into()).unwrap()).expect("cant get dst-length type").clone();
-
-                let length_type = src_length_type;
-
-                let src_item_type = γ_src.get(&dict.get_typeid(&"T".into()).unwrap()).expect("cant get src-item type").clone();
-                let dst_item_type = γ_dst.get(&dict.get_typeid(&"T".into()).unwrap()).expect("cant get src-item type").clone();
-
-                let length_c_type = get_c_repr_type(dict, length_type, true).expect("cant c-repr type for array length");
-                let src_item_c_type = get_c_repr_type(dict, src_item_type, true).expect("cant c-repr type for src item");
-                let dst_item_c_type = get_c_repr_type(dict, dst_item_type, true).expect("cant c-repr type for dst item");
-                let src_c_type = get_c_repr_type(dict, src_type, true).expect("cant get c-repr type for src type");
-                let dst_c_type = get_c_repr_type(dict, dst_type, true).expect("cant get c-repr type for dst type");
-
-                let map_fn = format!("length_prefix_{}_array_map_{}_to_{}",
-                    length_c_type, src_item_c_type, dst_item_c_type
-                );
-
-                let src_buf = if i%2 == 0 { "bufA" } else { "bufB" };
-                let dst_buf = if i%2 == 0 { "bufB" } else { "bufA" };
-                println!(r#"
-    {}
-            {} const * restrict src = (void*) {};
-            {} * restrict dst = (void*) {};
-            {} ( {}, src, dst );
-    {}"#,
-            '{',
-                    src_c_type, src_buf,
-                    dst_c_type, dst_buf,
-                    map_fn,
-                    item_morph.instantiated_symbol_name(dict, σ),
-                    '}');
-            }
-            LdmcMorphism::ValueDelimMap { delim, item_morph } => {
-                let src_c_type = get_c_repr_type(dict, item_morph.src_type.clone(), false).expect("cant get c-repr type for src type");
-                let dst_c_type = get_c_repr_type(dict, item_morph.dst_type.clone(), false).expect("cant get c-repr type for dst type");
-
-                let src_buf = if i%2 == 0 { "bufA" } else { "bufB" };
-                let dst_buf = if i%2 == 0 { "bufB" } else { "bufA" };
-                println!(r#"
-    {}
-            {} const * restrict src = (void*) {};
-            {} * restrict dst = (void*) {};
-            value_delim_array_map_8_to_64( {}, src, dst );
-    {}"#,
-            '{',
-                    src_c_type, src_buf,
-                    dst_c_type, dst_buf,
-                    item_morph.instantiated_symbol_name(dict, σ),
-                    '}');
-            }
-        }
-    }
-}

src/c_gen/gen_lib.rs

@@ -0,0 +1,81 @@
+use {
+    super::types::get_c_repr_arg_type, crate::{c_gen::LdmcCTargetMorph, LdmcPrimMorph}, laddertypes::{morphism::MorphismInstance, parser::*, MorphismType, TypeDict}, std::collections::HashMap
+};
+
+pub fn generate_lib(
+    dict: &mut impl TypeDict,
+    include_blocks: Vec< String >,
+    include_dependencies: HashMap< MorphismType, usize >,
+    morphisms: Vec< (String, MorphismInstance<LdmcPrimMorph>) >
+) -> Result<String, ()> {
+    let mut target = LdmcCTargetMorph::new( include_blocks, include_dependencies );
+    let mut wrappers = String::new();
+
+    for (name, morph) in morphisms {
+        match target.add_instantiation(dict, morph) {
+            Ok(inst) => {
+                if name == "main" {
+                    let mut c_source = String::new();
+                    c_source.push_str(&format!(r#"
+                #include <unistd.h>
+
+                int main() {{
+                    uint8_t bufIn[4096];
+                    uint8_t bufOut[4096];"#));
+
+                    if let Ok(_) = laddertypes::subtype_unify(
+                        &inst.ty.src_type,
+                        &dict.parse("<Seq~<ValueTerminated 0> Char~Ascii~native.UInt8>").expect("")
+                    ) {
+                        c_source.push_str("scanf(\"%s\", bufIn);");
+                    } else {
+                        c_source.push_str("read(0, bufIn, sizeof(bufIn));");
+                    }
+
+                    c_source.push_str(
+                        &format!(r#"FUSE( {}, (void const*)bufIn, (void*)bufOut );"#,
+                            inst.instantiated_symbol_name(dict, &HashMap::new()))
+                    );
+
+                    if let Ok(ψ) = laddertypes::subtype_unify(
+                        &inst.ty.dst_type,
+                        &dict.parse("<Seq~<ValueTerminated 0> native.UInt8>").expect("")
+                    ) {
+                        c_source.push_str("printf(\"%s\\n\", bufOut);");
+                    } else {
+                        c_source.push_str("write(1, bufOut, sizeof(bufOut));");
+                    }
+                    c_source.push_str("
+                    return 0;
+                }");
+                    wrappers.push_str(&c_source);
+                } else {
+                    target.add_type(dict, inst.ty.src_type.clone());
+                    target.add_type(dict, inst.ty.dst_type.clone());
+
+                    wrappers.push_str(&format!("
+                        int {} (
+                            {} const * restrict src,
+                            {} * restrict dst
+                        ) {{
+                            return {}( (void*)src, (void*)dst );
+                        }}
+                    ", name,
+                        get_c_repr_arg_type(dict, &inst.ty.src_type),
+                        get_c_repr_arg_type(dict, &inst.ty.dst_type),
+                        inst.instantiated_symbol_name(dict, &HashMap::new())
+                    ));
+                }
+            }
+            Err(_err) => {
+                eprintln!("failed to create morphism instatiation");
+                return Err(());
+            }
+        }
+    }
+
+    let mut c_source = target.into_c_source(dict);
+    c_source.push_str(&wrappers);
+
+    Ok(c_source)
+}

src/c_gen/mod.rs

@@ -0,0 +1,7 @@
+pub mod types;
+pub mod morph;
+pub mod gen_lib;
+
+pub use {
+    morph::target_morph::LdmcCTargetMorph
+};

src/c_gen/morph/mod.rs

@@ -0,0 +1,76 @@
+pub mod target_morph;
+
+use {
+    crate::{
+        c_gen::types::{
+            get_c_repr_arg_type,
+            get_c_repr_definition,
+            get_c_repr_type
+        },
+        morphism::LdmcPrimMorph
+    },
+    laddertypes::{TypeDict, Substitution},
+};
+
+impl LdmcPrimMorph {
+    pub fn instantiated_symbol_name(&self, dict: &mut impl TypeDict, σ: &impl Substitution) -> String {
+        let mut s = self.symbol.clone();
+        for (k_id,v) in self.type_args.iter() {
+            if let Some(val_trm) = σ.get(k_id) {
+                if let laddertypes::TypeID::Var(var_id) = k_id {
+
+                    //if self.get_type().strip_halo().src_type.contains_var(*var_id) ||
+                    //self.get_type().strip_halo().dst_type.contains_var(*var_id) {
+
+                        let name = dict.get_varname(*var_id).unwrap();
+                        let val_str = get_c_repr_type(dict, &val_trm);
+                        s.push_str(&format!("_{}_{}", name, val_str));
+
+                    //}
+                }
+            } else {
+                if let laddertypes::TypeID::Var(var_id) = k_id {
+                    let k = dict.get_varname(*var_id).unwrap();
+                    s.push_str(&format!("_{:?}_MISSING", k));
+                    eprintln!("INCOMPLETE MORPHISM INSTANTIATION, missing type parameter {} ({})", k, var_id);
+                }
+            }
+        }
+        s
+    }
+
+    pub fn expected_c_type_signature(&self, dict: &mut impl TypeDict,
+        σ: &std::collections::HashMap<laddertypes::TypeID, laddertypes::TypeTerm>
+    ) -> String {
+        format!("int {} ({} const * restrict src, {} * restrict dst);",
+            self.instantiated_symbol_name(dict, σ),
+            get_c_repr_definition(dict, self.ty.src_type.clone(), true).expect("cant get c-repr type for src type"),
+            get_c_repr_definition(dict, self.ty.dst_type.clone(), true).expect("cant get c-repr type for dst type"))
+    }
+
+    pub fn generate_instantiation(&self, dict: &mut impl TypeDict, σ: &impl Substitution) -> Option<String> {
+        let mut s = String::new();
+        let symbol = self.instantiated_symbol_name(dict, σ);
+
+        eprintln!("generate instantiation:");
+        let ty = self.ty.clone();
+        eprintln!("full type: {}   ---->    {}", ty.src_type.pretty(dict, 0),  ty.dst_type.pretty(dict,0));
+        let ty = ty.strip_halo().apply_subst(σ);
+        eprintln!("stripped type:  {}   ---->    {}", ty.src_type.pretty(dict, 0),  ty.dst_type.pretty(dict,0));
+
+        let src_c_symbol = get_c_repr_arg_type(dict, &ty.src_type);
+        let dst_c_symbol = get_c_repr_arg_type(dict, &ty.dst_type);
+
+        s.push_str(&format!(r#"
+int {} ( {} const * restrict src, {} * restrict dst ) {{
+"#,
+            symbol, src_c_symbol, dst_c_symbol,
+        ));
+        s.push_str(&self.c_source);
+        s.push_str(&format!(r#"
+    return 0;
+}}
+"#));
+        Some(s)
+    }
+}

src/c_gen/morph/target_morph.rs

@@ -0,0 +1,366 @@
+use {
+    crate::{
+        c_gen::types::{
+            encode_morph_type_to_symbol, encode_type_to_value, get_c_repr_definition, get_c_repr_kind, get_c_repr_type
+        },
+        morphism::LdmcPrimMorph
+    },
+    laddertypes::{
+        parser::*, Morphism, MorphismInstance, MorphismType, TypeDict, TypeTerm
+    },
+    std::collections::HashMap
+};
+
+pub struct LdmcCTargetMorph {
+    include_blocks: Vec< String >,
+    include_dependencies: HashMap< MorphismType, usize >,
+    active_includes: Vec< usize >,
+    active_types: Vec< TypeTerm >,
+    active_instantiations: Vec< LdmcPrimMorph >,
+    active_lenpfx_types: Vec< (TypeTerm, TypeTerm) >,
+    typedefs: Vec< String >,
+    macro_calls: Vec< String >
+}
+
+impl LdmcCTargetMorph {
+    pub fn add_required_include_block(&mut self, block: String) {
+        let i = self.include_blocks.len();
+        self.active_includes.push(i);
+        self.include_blocks.push(block);
+    }
+
+    pub fn new(
+        include_blocks: Vec< String >,
+        include_dependencies: HashMap< MorphismType, usize >
+    ) -> Self {
+        let mut m = LdmcCTargetMorph {
+            include_blocks,
+            include_dependencies,
+            active_includes: Vec::new(),
+            active_instantiations: Vec::new(),
+            active_types: Vec::new(),
+            active_lenpfx_types: Vec::new(),
+            typedefs: Vec::new(),
+            macro_calls: Vec::new()
+        };
+
+        m.add_required_include_block(
+            "/* default ldmc includes */
+#include <stdint.h>
+#define FUSE(morph, src, dst) { int result = morph(src,dst); if(result) return result; }
+
+".into()
+        );
+        m
+    }
+
+    pub fn add_type(&mut self, dict: &mut impl TypeDict, ty: TypeTerm) {
+        let ty = ty.strip();
+        if ! self.active_types.contains(&ty) {
+            eprintln!("add type {}", ty.pretty(dict,0));
+
+            let (ht,ft) = ty.get_floor_type();
+            if ht.is_empty() {
+
+                match &ft {
+                    TypeTerm::Seq { seq_repr, items } => {
+                        let item_type = items.first().unwrap().clone();
+                        self.add_type(dict, item_type.clone());
+
+                        if let Some(seq_repr) = seq_repr {
+                            dict.add_varname("LengthType".into());
+                            if let Ok(σ) =
+                                laddertypes::constraint_system::unify(
+                                    seq_repr.as_ref(),
+                                    &dict.parse_desugared("<LengthPrefix LengthType>").expect("").sugar(dict)
+                                )
+                            {
+                                let length_type = σ.get(&dict.get_typeid(&"LengthType".into()).expect("")).expect("cant get Length type");
+                                self.add_type(dict, length_type.clone());
+                                self.macro_calls.push(
+                                    format!("DEFINE_LENGTH_PREFIX_ARRAY({}, {})\n",
+                                        get_c_repr_type(dict, &length_type),
+                                        get_c_repr_type(dict, &item_type)
+                                    )
+                                );
+                            }
+                        }
+                    }
+                    _ => {}
+                }
+
+                self.active_types.push(ty.clone());
+                if let Some(type_def) = get_c_repr_definition(dict, ft, false) {
+                    let type_name = get_c_repr_type(dict, &ty);
+                    self.typedefs.push(format!("typedef {} {};\n", type_def, type_name));
+                } else {
+                    eprintln!("cant get c-repr type for type '{}'", ty.pretty(dict,0));
+                }
+            } else {
+                let type_name = get_c_repr_type(dict, &ty);
+                let type_def = get_c_repr_type(dict, &ft);
+                self.add_type(dict, ft);
+                self.typedefs.push(format!("typedef {} {};\n", type_def, type_name));
+            }
+        }
+    }
+
+    pub fn add_instantiation(
+        &mut self,
+        dict: &mut impl TypeDict,
+        morph: MorphismInstance<LdmcPrimMorph>,
+    ) -> Result<LdmcPrimMorph, ()> {
+        let new_inst = self.bake_morphism(dict, morph)?;
+        if ! self.active_instantiations.contains(&new_inst) {
+            self.active_instantiations.push(new_inst.clone());
+        }
+
+        let ty = new_inst.get_type().strip_halo();
+        self.add_type(dict, ty.src_type);
+        self.add_type(dict, ty.dst_type);
+
+        Ok(new_inst)
+    }
+
+    pub fn into_c_source(mut self, dict: &mut impl TypeDict) -> String {
+        let mut source = String::new();
+        self.active_includes.dedup();
+        self.typedefs.dedup();
+        self.macro_calls.dedup();
+
+        for i in self.active_includes {
+            source.push_str( &self.include_blocks[i] );
+            source.push('\n');
+        }
+        source.push('\n');
+
+        for typedef in self.typedefs {
+            source.push_str(&typedef);
+        }
+
+        source.push('\n');
+
+
+        for m in self.macro_calls {
+            source.push_str(&m);
+            source.push('\n');
+        }
+        source.push('\n');
+
+        for m in self.active_instantiations {
+            source.push_str(&m.generate_instantiation(dict, &HashMap::new()).expect("cant create function"));
+        }
+        source
+    }
+
+    pub fn bake_morphism(
+        &mut self,
+        dict: &mut impl laddertypes::TypeDict,
+        morph_inst: MorphismInstance<LdmcPrimMorph>,
+    ) -> Result<LdmcPrimMorph, ()> {
+        let ty = morph_inst.get_type();
+        let symbol = encode_morph_type_to_symbol(dict, &ty);
+
+        match &morph_inst {
+            MorphismInstance::Primitive { ψ, σ, morph } => {
+                if let Some(i) = self.include_dependencies.get(&morph.get_type()) {
+                    self.active_includes.push(*i);
+                }
+
+
+                let mut c_source = String::new();
+                for (ty_id, kind) in morph.type_args.iter() {
+                    if let laddertypes::TypeID::Var(var_id) = ty_id {
+                        if let Some(val) = σ.get(ty_id) {
+                            let type_var_value =
+                                if kind == "Type" {
+                                    get_c_repr_type(dict, val)
+                                } else {
+                                    encode_type_to_value(dict, val)
+                                };
+                            c_source.push_str(&format!("    #define {} {}\n", dict.get_typename(&ty_id).unwrap(), type_var_value));
+                        }
+                    }
+                }
+                c_source.push_str(&morph.c_source);
+                for (ty_id, kind) in morph.type_args.iter() {
+                    if let laddertypes::TypeID::Var(var_id) = ty_id {
+                        c_source.push_str(&format!("\n    #undef {}", dict.get_typename(&ty_id).unwrap()));
+                    }
+                }
+
+                Ok(LdmcPrimMorph{
+                    symbol: morph.instantiated_symbol_name(dict, σ),
+                    type_args: Vec::new(),
+                    ty: morph_inst.get_type().apply_subst(σ).strip_halo(),
+                    c_source
+                })
+            },
+            MorphismInstance::Chain { path } => {
+                let mut c_source = String::new();
+
+                if path.len() > 1 {
+                    c_source.push_str(r#"
+            uint8_t bufA[4096];
+            uint8_t bufB[4096];
+    "#);
+                }
+
+                for (i,morph) in path.iter().enumerate() {
+                    if let Ok(inst) = self.add_instantiation(dict, morph.clone()) {
+                        let morph_symbol = inst.instantiated_symbol_name(dict, &morph.get_subst());
+                        let src_buf = if i == 0 { "(void*)src" } else if i%2 == 0 { "(void*)bufA" } else { "(void*)bufB" };
+                        let dst_buf = if i+1 == path.len() { "(void*)dst" } else if i%2 == 0 { "(void*)bufB" } else { "(void*)bufA" };
+
+                        c_source.push_str(&format!(r#"
+        FUSE( {}, {}, {} );"#,
+                            morph_symbol, src_buf, dst_buf,
+                        ));
+                    } else {
+                        c_source.push_str(&format!("/* ERROR: missing morphism */"));
+                        eprintln!("failed to add instantiation of item morphism");
+                    }
+                }
+
+                Ok(LdmcPrimMorph {
+                    symbol, type_args: Vec::new(), ty,
+                    c_source
+                })
+            }
+            MorphismInstance::MapSeq { ψ, seq_repr, item_morph } => {
+                if let Ok(item_morph_inst) = self.add_instantiation(dict, item_morph.as_ref().clone()) {
+                    if let Some(seq_repr) = seq_repr {
+                        dict.add_varname("Length".into());
+                        dict.add_varname("LengthType".into());
+                        dict.add_varname("TerminatorValue".into());
+
+                        if let Ok(γ) = laddertypes::constraint_system::unify(
+                            &dict.parse_desugared("<StaticLength Length>").expect("parse type template").sugar(dict),
+                            seq_repr.as_ref()
+                        ) {
+                            let length = γ.get(&dict.get_typeid(&"Length".into()).expect("")).expect("cant get Length");
+                            match length {
+                                TypeTerm::Num(l) => {
+                                    let item_morph_symbol = item_morph_inst.instantiated_symbol_name(dict, &HashMap::new());
+
+                                    self.add_type( dict, morph_inst.get_type().strip_halo().src_type );
+                                    self.add_type( dict, morph_inst.get_type().strip_halo().dst_type );
+
+                                    let c_source = format!(r#"
+                                        for( size_t i = 0; i < {}; ++i ) {{
+                                            FUSE( {}, &src->items[i], &dst->items[i] );
+                                        }}
+                                        "#,
+                                        l,
+                                        item_morph_symbol,
+                                    );
+
+                                    Ok(LdmcPrimMorph{
+                                        symbol, type_args: Vec::new(), ty,
+                                        c_source
+                                    })
+                                }
+                                _ => {
+                                    eprintln!("invalid length '{}'", length.pretty(dict, 0));
+                                    Err(())
+                                }
+                            }
+                        }
+
+                        else if let Ok(γ) = laddertypes::constraint_system::unify(
+                            &dict.parse_desugared("<LengthPrefix LengthType>").expect("parse type template").sugar(dict),
+                            seq_repr.as_ref()
+                        ) {
+                            // todo: assert that length type is native.UIntX
+                            //let length_type = γ.get(&dict.get_typeid(&"LengthType".into()).expect("")).expect("cant get LengthType");
+                            let item_morph_symbol = item_morph_inst.instantiated_symbol_name(dict, &HashMap::new());
+
+                            self.add_type( dict, morph_inst.get_type().strip_halo().src_type );
+                            self.add_type( dict, morph_inst.get_type().strip_halo().dst_type );
+
+                            let c_source = format!(r#"
+                                for( size_t i = 0; i < src->len; ++i ) {{
+                                    FUSE( {}, &src->items[i], &dst->items[i] );
+                                }}
+                                dst->len = src->len;
+                                "#,
+                                item_morph_symbol,
+                            );
+
+                            Ok(LdmcPrimMorph{
+                                symbol, type_args: Vec::new(), ty,
+                                c_source
+                            })
+                        }
+
+                        else if let Ok(γ) = laddertypes::constraint_system::unify(
+                            &dict.parse_desugared("<ValueTerminated TerminatorValue>").expect("parse type template").sugar(dict),
+                            seq_repr.as_ref()
+                        ) {
+                            let terminator_value = γ.get(&dict.get_typeid(&"TerminatorValue".into()).expect("")).expect("cant get TerminatorValue");
+                            let item_morph_symbol = item_morph_inst.instantiated_symbol_name(dict, &HashMap::new());
+                            let terminator = encode_type_to_value(dict, terminator_value);
+
+                            let c_source = format!(r#"
+                                while( *src != {} ) {{
+                                    FUSE( {}, src, dst );
+                                    ++src;
+                                    ++dst;
+                                }}
+                                *dst = {};"#,
+                                terminator,
+                                item_morph_symbol,
+                                terminator
+                            );
+
+                            Ok(LdmcPrimMorph{
+                                symbol, type_args: Vec::new(), ty,
+                                c_source
+                            })
+                        }
+
+
+                        else {
+                            eprintln!("Error: Unknown Seq- Representation!!");
+                            Err(())
+                        }
+                    } else {
+                        eprintln!("Error: missing Seq- Representation!!");
+                        Err(())
+                    }
+                } else {
+                    eprintln!("failed to add item-morph instantiation");
+                    Err(())
+                }
+            },
+            MorphismInstance::MapStruct { ψ, src_struct_repr, dst_struct_repr, member_morph } => {
+
+                let mut c_source = String::new();
+
+                for (name, morph) in member_morph.iter() {
+                    if let Ok(inst) = self.add_instantiation(dict, morph.clone()) {
+                        let name = name.replace("-", "_").replace(".","_dot_");
+                        c_source.push_str(
+                            &format!("
+        FUSE( {}, &src->{}, &dst->{} );",
+                            inst.symbol,
+                            name, name
+                        ));
+                    } else {
+                        c_source.push_str(&format!("/* ERROR: missing morphism for struct member '{}' */", name));
+                        eprintln!("failed to create morphism instantiation for struct member");
+                        return Err(());
+                    }
+                }
+
+                Ok(LdmcPrimMorph{
+                    symbol, type_args: Vec::new(), ty,
+                    c_source
+                })
+            }
+            MorphismInstance::MapEnum { ψ, enum_repr, variant_morph } => {
+                todo!();
+            }
+        }
+    }
+}

src/c_gen/types/mod.rs

@@ -0,0 +1,257 @@
+use {
+    crate::struct_layout::LayoutType,
+    chumsky::chain::Chain, laddertypes::{morphism::MorphismType,
+        parser::*,
+        substitution::Substitution,
+        unparser::*, EnumVariant, StructMember, TypeTerm, TypeDict}
+};
+
+/*
+*/
+pub fn get_c_repr_kind(kind: String) -> Option<String> {
+    match kind.as_str() {
+        "ℤ" => Some("uint64_t".into()),
+        _ => None
+    }
+}
+
+/* for a given ladder type `t`, get the corresponding C type
+ */
+pub fn get_c_repr_definition(dict: &mut impl TypeDict, t: TypeTerm, skip_pointer: bool) -> Option<String> {
+    match t {
+        TypeTerm::TypeID(tyid) => {
+            if tyid == dict.get_typeid_creat("native.UInt8") {
+                Some("uint8_t".into())
+            } else if tyid == dict.get_typeid_creat("native.UInt16") {
+                Some("uint16_t".into())
+            } else if tyid == dict.get_typeid_creat("native.UInt32") {
+                Some("uint32_t".into())
+            } else if tyid == dict.get_typeid_creat("native.UInt64") {
+                Some("uint64_t".into())
+            } else if tyid == dict.get_typeid_creat("native.Address") {
+                Some("void*".into())
+            } else if tyid == dict.get_typeid_creat("native.Float32") {
+                Some("float".into())
+            } else if tyid == dict.get_typeid_creat("native.Float64") {
+                Some("double".into())
+            } else {
+                None
+            }
+        }
+
+        TypeTerm::Seq{ seq_repr, items } => {
+            if let Some(seq_repr) = seq_repr {
+                let item_type = items.first().expect("no item type specified!").clone();
+                let item_c_type : String = get_c_repr_type(dict, &item_type);
+
+                dict.add_varname("Length".into()); // Kind: Num
+                dict.add_varname("LengthType".into()); // Kind: Type
+                dict.add_varname("TermValue".into()); // Kind: Value of Type ItemType
+
+                if let Ok((ψ, σ)) = laddertypes::constraint_system::subtype_unify(
+                    seq_repr.as_ref(),
+                    &dict.parse_desugared("<StaticLength Length>").expect("parse template type").sugar(dict)
+                ) {
+                    let length = match
+                        σ.get(
+                            &dict.get_typeid(&"Length".into()).expect("no Length ID")
+                        ).expect("no length specified!")
+                    {
+                        TypeTerm::Num(l) => l,
+                        _ => {
+                            eprintln!("invalid Length!");
+                            return None;
+                        }
+                    };
+                    Some(format!("struct {{ {} items[{}]; }} ", item_c_type, length))
+                }
+                else if let Ok((ψ, σ)) = laddertypes::constraint_system::subtype_unify(
+                    seq_repr.as_ref(),
+                    &dict.parse_desugared("<LengthPrefix LengthType>").expect("parse template type").sugar(dict)
+                ) {
+                    let length_type = σ.get(
+                            &dict.get_typeid(&"LengthType".into()).expect("no LengthType ID")
+                        ).expect("no length type specified");
+
+                    let length_c_type = get_c_repr_type(dict, &length_type);
+
+                    Some(format!("struct {{ {} len; {} items[]; }} ", length_c_type, item_c_type))
+                }
+                else if let Ok((ψ, σ)) = laddertypes::constraint_system::subtype_unify(
+                    seq_repr.as_ref(),
+                    &dict.parse_desugared("<ValueTerminated TermValue>").expect("parse template type").sugar(dict)
+                ) {
+                    if skip_pointer {
+                        Some(item_c_type)
+                    } else {
+                        Some(format!("{} *", item_c_type))
+                    }
+                }
+                else if let Ok((ψ, σ)) = laddertypes::constraint_system::subtype_unify(
+                    seq_repr.as_ref(),
+                    &dict.parse_desugared("MsbCont").expect("parse template type").sugar(dict)
+                ) {
+                    if skip_pointer {
+                        Some(item_c_type)
+                    } else {
+                        Some(format!("{} *", item_c_type))
+                    }
+                }
+                else {
+                    eprintln!("can't get C-repr for sequence type `{}`!", seq_repr.pretty(dict, 0));
+                    None
+                }
+            } else {
+                eprintln!("no sequence-representation type specified!");
+                None
+            }
+        }
+
+        TypeTerm::Struct{ struct_repr, members } => {
+            let c_struct_attribute =
+                if let Some(sr) = struct_repr {
+                    let sr = sr.desugar(dict);
+                    match LayoutType::parse(dict, &sr).expect("layout type") {
+                        LayoutType::Aligned => "",
+                        LayoutType::Packed => "__attribute((packed))__"
+                    }
+                } else {""};
+
+            let mut c_type = format!("struct {} {{\n", c_struct_attribute);
+
+            for StructMember{ symbol, ty } in members {
+                let field_c_type = get_c_repr_definition(dict, ty, false).expect("");
+                c_type.push_str(&format!("    {} {};\n",
+                    field_c_type,
+                    symbol.replace("-", "_").replace(".","_dot_")
+                ));
+            }
+
+            c_type.push_str("}");
+            Some(c_type)
+        }
+
+        TypeTerm::Enum { enum_repr, variants } => {
+            let mut c_type = format!("
+struct {{
+    enum {{
+");
+
+            for (i, EnumVariant{ symbol, ty }) in variants.iter().enumerate() {
+                c_type.push_str(&format!(
+                    "       {} = {}", symbol.replace("-", "_").replace(".","_dot_").to_uppercase(), i
+                ));
+
+                if i+1 < variants.len() {
+                    c_type.push_str(",\n");
+                }
+            }
+
+            c_type.push_str("
+    } tag;
+
+    union {
+");
+
+            for EnumVariant{ symbol, ty } in variants {
+                let variant_c_type = get_c_repr_definition(dict, ty, false).expect("cant get C-Repr type for variant");
+                c_type.push_str(&format!(
+                    "       {} {};\n", variant_c_type, symbol.replace("-", "_").replace(".","_dot_")
+                ));
+            }
+
+            c_type.push_str("
+    };
+}");
+
+            Some(c_type)
+        }
+
+        TypeTerm::Ladder(rungs) => {
+            if let Some(t) = rungs.last() {
+                get_c_repr_definition(dict, t.clone(), false)
+            } else {
+                None
+            }
+        }
+
+        _ => { None }
+    }
+}
+
+pub fn get_c_repr_type(dict: &mut impl TypeDict, t: &laddertypes::TypeTerm)-> String {
+    let t = t.clone().strip();
+
+    match t.desugar(dict) {
+        laddertypes::DesugaredTypeTerm::Char(c) => {
+            match c {
+                '.' => format!("_dot_"),
+                '-' => format!("_minus_"),
+                _ =>
+                format!("{}", (c as u64))
+            }
+        },
+        laddertypes::DesugaredTypeTerm::Num(n) => {
+            format!("{}", n)
+        }
+        laddertypes::DesugaredTypeTerm::TypeID(ty_id) => {
+            if let Some(name) = dict.get_typename(&ty_id) {
+                name
+                    .replace("-", "_")
+                    .replace(".", "")
+            } else {
+                format!("")
+            }
+        }
+        laddertypes::DesugaredTypeTerm::Ladder(rs) |
+        laddertypes::DesugaredTypeTerm::App(rs) => {
+            let mut s = String::new();
+            s.push('_');
+            for r in rs {
+                let r = r.sugar(dict);
+                s.push_str(&get_c_repr_type(dict, &r));
+                s.push('_');
+            }
+            s
+        }
+    }
+}
+
+pub fn get_c_repr_arg_type(dict: &mut impl TypeDict, t: &laddertypes::TypeTerm)-> String {
+    let t = t.clone().strip().get_floor_type().1;
+    dict.add_varname("TerminatorValue".into());
+    match &t {
+        TypeTerm::Seq { seq_repr, items } => {
+            if let Some(seq_repr) = seq_repr.as_ref() {
+                if let Ok(ψ) = laddertypes::constraint_system::subtype_unify(
+                    seq_repr,
+                    &dict.parse_desugared("<ValueTerminated TerminatorValue>").expect("").sugar(dict)
+                ) {
+                    return get_c_repr_type(dict, &items[0].clone().strip().get_floor_type().1);
+                }
+                else if let Ok(ψ) = laddertypes::constraint_system::subtype_unify(
+                    seq_repr,
+                    &dict.parse_desugared("MsbCont").expect("").sugar(dict)
+                ) {
+                    return get_c_repr_type(dict, &items[0].clone().strip().get_floor_type().1);
+                }
+            }
+        }
+
+        _ => {}
+    }
+    get_c_repr_type(dict, &t)
+}
+
+pub fn encode_morph_type_to_symbol(dict: &mut impl TypeDict, t: &MorphismType) -> String {
+    format!(
+        "morph__{}___TO__{}",
+        get_c_repr_type(dict, &t.strip_halo().src_type),
+        get_c_repr_type(dict, &t.strip_halo().dst_type)
+    )
+}
+
+pub fn encode_type_to_value(dict: &mut impl TypeDict, t: &laddertypes::TypeTerm) -> String {
+    let t = t.clone().desugar(dict);
+    dict.unparse(&t)
+}

src/main.rs

@@ -3,44 +3,85 @@
 mod morphism;
 mod parser;
 mod c_gen;
+mod struct_layout;
 
 use {
-    ariadne::{Color, Label, Report, ReportKind, Source},
-    chumsky::prelude::*,
-    laddertypes::{
-        parser::ParseLadderType, BimapTypeDict, MorphismType
-    },
-    std::sync::{Arc, RwLock},
-    tiny_ansi::TinyAnsi,
-
-
     crate::{
-        morphism::LdmcMorphism,
+        morphism::LdmcPrimMorph,
         parser::morphism_base_parser,
-    }
+    }, ariadne::{Color, Label, Report, ReportKind, Source}, clap::Parser, laddertypes::{
+        morphism::MorphismType, BimapTypeDict, Morphism
+    }, parser::morphism_type_parser, std::{io::Write, path::PathBuf, sync::{Arc, RwLock}}, tiny_ansi::TinyAnsi, walkdir::WalkDir
 };
 
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    #[arg(short='b', long)]
+    morphism_base: Vec<PathBuf>,
+
+    #[arg(short='m', long="morph")]
+    morphisms: Vec<String>,
+
+    #[arg(short='o', long)]
+    output: Option<PathBuf>
+}
+
 fn main() {
+    let args = Args::parse();
     let mut type_dict = Arc::new(RwLock::new(BimapTypeDict::new()));
-    let mut morphism_base = laddertypes::MorphismBase::<LdmcMorphism>::new(vec![
-        //type_dict.parse("Seq~MsbCont").expect(""),
-        //type_dict.parse("Seq~<ValueTerminated '\\0'>").expect(""),
-        type_dict.parse("Seq~<LengthPrefix native.UInt64>").expect("")
-    ]);
+    let mut morphism_base = laddertypes::morphism_base::MorphismBase::<LdmcPrimMorph>::new();
 
-    let mut args = std::env::args().skip(1);
-    let src_type_arg = args.next().expect("src type expected");
-    let dst_type_arg = args.next().expect("dst type expected");
+    // 1. load morphism base
+    let mut mb_paths = args.morphism_base;
 
-    for mb_path in args {
-        let src = std::fs::read_to_string(mb_path.clone()).expect("read");
+    // 1.1. pfade ermitteln
+    let env_var = "MORPHISM_BASE";
+    let suffix = ".morphism-base";
+
+    match std::env::var(env_var) {
+        Ok(path_str) => {
+            let path = std::path::Path::new(&path_str);
+            if path.is_dir() {
+                for entry in WalkDir::new(path)
+                    .into_iter()
+                    .filter_map(Result::ok)
+                    .filter(|e| e.path().is_file() && e.path().extension().map_or(false, |ext| ext == &suffix[1..]))
+                {
+                    mb_paths.push(entry.path().into());
+                }
+            } else {
+                eprintln!("morphism-base path is not a directory: {:?}", path);
+            }
+        }
+        Err(e) => {
+            eprintln!("failed to read environment variable {}: {}", env_var, e);
+        }
+    }
+
+    // 1.2. read files
+
+    let mut include_blocks = Vec::new();
+    let mut include_dependencies = std::collections::HashMap::new();
+
+    for mb_path in mb_paths {
+        let src = std::fs::read_to_string(mb_path.clone()).expect("failed to read morphism base");
+
+        use chumsky::Parser;
         let result = morphism_base_parser(type_dict.clone()).parse(src.clone());
         match result {
             Ok((includes, morphisms)) => {
-                eprintln!("[{}] parse ok.", mb_path.bright_yellow());
-                println!("{}", includes);
+                eprintln!("[{}] parse ok.", mb_path.to_str().unwrap().bright_yellow());
+
+                let include_idx = include_blocks.len();
+
+                let mut includes_prefixed = format!("/* from `{}` */", mb_path.display());
+                includes_prefixed.push_str(&includes);
+                include_blocks.push(includes_prefixed);
+
                 for m in morphisms {
-                    morphism_base.add_morphism(LdmcMorphism::Primitive(m));
+                    include_dependencies.insert( m.get_type(), include_idx );
+                    morphism_base.add_morphism(m);
                 }
             }
             Err(errs) => {
@@ -60,22 +101,21 @@ fn main() {
         }
     }
 
+    // 2. Generate Morphisms
+    let mut instances = Vec::new();
+    for morph_decl in args.morphisms.iter() {
+        use chumsky::Parser;
+        if let Ok((name, src_type, dst_type)) = morphism_type_parser(type_dict.clone()).parse(morph_decl.as_str()) {
+            let ty = MorphismType{ src_type, dst_type };
+            instances.push( (name, morphism_base.get_morphism_instance( &ty ).expect("failed to find morphism")) );
+        }
+    }
 
-    let src_type = type_dict.parse( src_type_arg.as_str() ).expect("");
-    let dst_type = type_dict.parse( dst_type_arg.as_str() ).expect("");
-
-    let path = morphism_base.find_morphism_path(MorphismType {
-        src_type: src_type.clone(),
-        dst_type: dst_type.clone(),
-    });
-
-    match path {
-        Some(path) => {
-            c_gen::generate_main(&mut type_dict, path, src_type, dst_type);
-        }
-        None => {
-            eprintln!("Error: could not find morphism path");
-            std::process::exit(-1);
-        }
+    let c_source = crate::c_gen::gen_lib::generate_lib(&mut type_dict, include_blocks, include_dependencies, instances).expect("failed to generate library");
+    if let Some(out_path) = args.output {
+        let mut file = std::fs::File::create(out_path).expect("failed to open output file");
+        file.write_all(c_source.as_bytes()).expect("failed to write output file");
+    } else {
+        println!("{}", c_source);
     }
 }

src/morphism.rs

@@ -1,76 +1,16 @@
 
-use laddertypes::morphism::Morphism;
+use laddertypes::morphism::{Morphism, MorphismType};
 
-#[derive(Clone, Debug)]
-pub struct LdmcPrimCMorphism {
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct LdmcPrimMorph {
     pub symbol: String,
     pub type_args: Vec<(laddertypes::TypeID, String)>,
-    pub src_type: laddertypes::TypeTerm,
-    pub dst_type: laddertypes::TypeTerm,
+    pub ty: MorphismType,
     pub c_source: String
 }
 
-#[derive(Clone)]
-pub enum LdmcMorphism {
-    Primitive( LdmcPrimCMorphism ),
-    LengthPrefixMap{
-        length_prefix_type: laddertypes::TypeTerm,
-        item_morph: Box<LdmcPrimCMorphism>
-    },
-    ValueDelimMap{
-        delim: u64,
-        item_morph: Box<LdmcPrimCMorphism>
-    }
-}
-
-impl Morphism for LdmcMorphism {
-    fn weight(&self) -> u64 {
-        1
-    }
-
-    fn get_type(&self) -> laddertypes::MorphismType {
-        match self {
-            LdmcMorphism::Primitive(prim_morph) =>
-                laddertypes::MorphismType {
-                    src_type: prim_morph.src_type.clone().normalize(),
-                    dst_type: prim_morph.dst_type.clone().normalize()
-                },
-            LdmcMorphism::LengthPrefixMap{ length_prefix_type, item_morph } => {
-                laddertypes::MorphismType {
-                    src_type: laddertypes::TypeTerm::App(vec![ length_prefix_type.clone(), item_morph.src_type.clone() ]),
-                    dst_type: laddertypes::TypeTerm::App(vec![ length_prefix_type.clone(), item_morph.dst_type.clone() ]),
-                }
-            },
-            LdmcMorphism::ValueDelimMap{ delim, item_morph } => {
-                let value_delim_type = laddertypes::TypeTerm::App(vec![]);
-                laddertypes::MorphismType {
-                    src_type: laddertypes::TypeTerm::App(vec![ value_delim_type.clone(), item_morph.src_type.clone() ]),
-                    dst_type: laddertypes::TypeTerm::App(vec![ value_delim_type.clone(), item_morph.dst_type.clone() ]),
-                }
-            }
-        }.normalize()
-    }
-
-    fn map_morphism(&self, seq_type: laddertypes::TypeTerm) -> Option< Self > {
-        match self {
-            LdmcMorphism::Primitive(prim) => {
-                let item_morph = Box::new(prim.clone());
-/*
-                if seq_type == self.length_prefix_type {
-                */
-                    Some(LdmcMorphism::LengthPrefixMap{
-                        length_prefix_type: seq_type,
-                        item_morph,
-                    })
-                    /*
-                } else if seq_type == self.value_delim_type {
-                    Some(LdmcMorphism::ValueDelimMap { delim, item_morph })
-                } else {
-                    None
-                }
-                */
-            }
-            _ => None
-        }
+impl Morphism for LdmcPrimMorph {
+    fn get_type(&self) -> MorphismType {
+        self.ty.clone()
     }
 }

src/parser.rs

@@ -1,11 +1,7 @@
 use {
-    chumsky::{
+    crate::morphism::LdmcPrimMorph, chumsky::{
         prelude::*, text::*
-    },
-    std::sync::{Arc, RwLock},
-
-    laddertypes::{TypeDict, BimapTypeDict, parser::*},
-    crate::morphism::LdmcPrimCMorphism
+    }, laddertypes::{TypeTerm, morphism::MorphismType, parser::*, BimapTypeDict, TypeDict}, std::sync::{Arc, RwLock}
 };
 
 /* morphism-base text format:
@@ -18,12 +14,12 @@ use {
  */
 pub fn morphism_base_parser(
     type_dict: Arc<RwLock< BimapTypeDict >>
-) -> impl Parser<char, (String, Vec<LdmcPrimCMorphism>), Error = Simple<char>> {
+) -> impl Parser<char, (String, Vec<LdmcPrimMorph>), Error = Simple<char>> {
 
     just("```")
     .then(take_until(just("```")))
     .map(
-        move |(a, (b, c))| {
+        move |(_a, (b, _c))| {
             b.iter().collect()
         }
     )
@@ -66,11 +62,13 @@ pub fn morphism_base_parser(
             let src_type = type_dict.parse(&src_type.iter().collect::<String>()).expect("couldnt parse src type");
             let dst_type = type_dict.parse(&dst_type.iter().collect::<String>()).expect("couldnt parse dst type");
 
-            LdmcPrimCMorphism {
+            LdmcPrimMorph {
                 symbol,
                 type_args: ty_args,
+                ty: MorphismType{
                     src_type,
-                dst_type,
+                    dst_type
+                },
                 c_source
             }
         })
@@ -78,3 +76,25 @@ pub fn morphism_base_parser(
 
     )
 }
+
+pub fn morphism_type_parser(
+    mut type_dict: Arc<RwLock< BimapTypeDict >>
+) -> impl Parser<char, (String, TypeTerm, TypeTerm), Error = Simple<char>> {
+    ident()
+        .padded()
+        .then(just(":").ignored())
+        .then(
+            take_until(just("-->").ignored())
+        )
+        .then(take_until(end()))
+        .map({
+            let type_dict = type_dict.clone();
+            move |((name, src_type), dst_type)| {
+                (
+                    name.0,
+                    type_dict.clone().parse(&src_type.0.iter().collect::<String>()).expect("parse type"),
+                    type_dict.clone().parse(&dst_type.0.iter().collect::<String>()).expect("parse type")
+                )
+            }
+        })
+}

src/platform/x86.rs

@@ -0,0 +1,43 @@
+use std::collections::HashMap;
+
+pub fn example_substitution() {
+    let mut γ = HashMap::new();
+    γ.insert(
+        type_dict.get_typeid_creat(&"Byte"),
+        type_dict.parse("<Seq~<StaticLength 8> Bit>").expect("parse")
+            .apply_subst(&γ)
+            .clone()
+    );
+    γ.insert(
+        type_dict.get_typeid_creat(&"x86.UInt8"),
+        type_dict.parse("ℤ_2^8 ~ <PosInt 2 LittleEndian> ~ <Seq~<StaticLength 8> <Digit 2> ~ Bit>").expect("parse")
+            .apply_subst(&γ)
+            .clone()
+    );
+    γ.insert(
+        type_dict.get_typeid_creat(&"x86.UInt16"),
+        type_dict.parse("ℤ_2^16 ~ <PosInt 256 LittleEndian> ~ <Seq~<StaticLength 2> <Digit 256> ~ x86.UInt8 >").expect("parse")
+            .apply_subst(&γ)
+            .clone()
+    );
+    γ.insert(
+        type_dict.get_typeid_creat(&"x86.UInt32"),
+        type_dict.parse("ℤ_2^32 ~ <PosInt 256 LittleEndian> ~ <Seq~<StaticLength 4> <Digit 256> ~ x86.UInt8 >").expect("parse")
+            .apply_subst(&γ).clone()
+    );
+    γ.insert(
+        type_dict.get_typeid_creat(&"x86.UInt64"),
+        type_dict.parse("ℤ_2^64 ~ <PosInt 256 LittleEndian> ~ <Seq~<StaticLength 8> <Digit 256> ~ x86.UInt8 >").expect("parse")
+            .apply_subst(&γ).clone()
+    );
+    γ.insert(
+        type_dict.get_typeid_creat(&"x86.Float32"),
+        type_dict.parse("ℝ ~ IEEE-754.Float32 ~ <Seq~<StaticLength 4> Byte>").expect("parse")
+            .apply_subst(&γ).clone()
+    );
+    γ.insert(
+        type_dict.get_typeid_creat(&"x86.Float64"),
+        type_dict.parse("ℝ ~ IEEE-754.Float64 ~ <Seq~<StaticLength 4> Byte>").expect("parse")
+            .apply_subst(&γ).clone()
+    );
+}

src/struct_layout.rs

@@ -0,0 +1,244 @@
+
+
+use laddertypes::{parser::*, StructMember, TypeTerm, TypeDict, DesugaredTypeTerm};
+
+#[derive(Clone, Copy, Debug)]
+pub enum ObjectSize {
+    Static(u64),
+    Dynamic(/* function to get size at runtime */),
+    Unknown
+}
+
+impl std::ops::Add for ObjectSize {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self {
+        match (self, rhs) {
+            (ObjectSize::Unknown, _) |
+            (_, ObjectSize::Unknown)
+                => ObjectSize::Unknown,
+
+            (ObjectSize::Dynamic(), _) |
+            (_, ObjectSize::Dynamic())
+                => ObjectSize::Dynamic(),
+
+            (ObjectSize::Static(s1), ObjectSize::Static(s2)) => ObjectSize::Static(s1 + s2),
+        }
+    }
+}
+
+impl std::ops::Mul for ObjectSize {
+    type Output = Self;
+
+    fn mul(self, rhs: Self) -> Self {
+        match (self, rhs) {
+            (ObjectSize::Unknown, _) |
+            (_, ObjectSize::Unknown)
+                => ObjectSize::Unknown,
+
+            (ObjectSize::Dynamic(), _) |
+            (_, ObjectSize::Dynamic())
+                => ObjectSize::Dynamic(),
+
+            (ObjectSize::Static(s1), ObjectSize::Static(s2)) => ObjectSize::Static(s1 * s2),
+        }
+    }
+}
+
+pub fn get_type_size( dict: &mut impl TypeDict, ty: TypeTerm ) -> ObjectSize {
+    match &ty {
+        TypeTerm::TypeID(tyid) => {
+                 if tyid == &dict.get_typeid_creat("native.UInt8") { ObjectSize::Static(1) }
+            else if tyid == &dict.get_typeid_creat("native.UInt16") { ObjectSize::Static(2) }
+            else if tyid == &dict.get_typeid_creat("native.UInt32") { ObjectSize::Static(4) }
+            else if tyid == &dict.get_typeid_creat("native.UInt64") { ObjectSize::Static(8) }
+            else if tyid == &dict.get_typeid_creat("native.Address") { ObjectSize::Static(8) }
+            else if tyid == &dict.get_typeid_creat("native.Float32") { ObjectSize::Static(4) }
+            else if tyid == &dict.get_typeid_creat("native.Float64") { ObjectSize::Static(8) }
+            else {
+                ObjectSize::Unknown
+            }
+        },
+
+        TypeTerm::Ladder(rungs) => {
+            get_type_size(dict, rungs.last().unwrap().clone() )
+        }
+
+        TypeTerm::Struct { struct_repr, members } => {
+            let layout = StructLayout::parse_sugared(dict, ty).expect("invalid struct");
+            layout.get_size()
+        }
+
+        TypeTerm::Seq { seq_repr, items } => {
+            if let Some(seq_repr) = seq_repr {
+                dict.add_typename("Length".into());
+                dict.add_typename("LengthType".into());
+                dict.add_typename("TerminatorValue".into());
+
+                if let Ok(σ) = laddertypes::unify(
+                    &seq_repr.clone(),
+                    &dict.parse("<StaticLength Length>").expect("")
+                ) {
+                    if let Some(TypeTerm::Num(len)) = σ.get(&dict.get_typeid(&"Length".into()).expect("")) {
+                        ObjectSize::Static(*len as u64) * get_type_size(dict, items.first().unwrap().clone())
+                    } else {
+                        ObjectSize::Unknown
+                    }
+                }
+                else if let Ok(σ) = laddertypes::unify(
+                    &seq_repr.clone(),
+                    &dict.parse("<LengthPrefix LengthType>").expect("")
+                ) {
+                    ObjectSize::Dynamic()
+                }
+                else if let Ok(σ) = laddertypes::unify(
+                    &seq_repr.clone(),
+                    &dict.parse("<ValueTerminated TerminatorValue>").expect("")
+                ) {
+                    ObjectSize::Dynamic()
+                }
+                else {
+                    ObjectSize::Unknown
+                }
+            } else {
+                ObjectSize::Unknown
+            }
+        }
+
+        _ => ObjectSize::Unknown
+    }
+
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum LayoutType {
+    Aligned,
+    Packed
+}
+
+impl LayoutType {
+    pub fn parse( dict: &mut impl TypeDict, ty: &DesugaredTypeTerm ) -> Option< LayoutType > {
+        if ty == &dict.parse_desugared("Aligned").expect("parse") {
+            Some(LayoutType::Aligned)
+        } else if ty == &dict.parse_desugared("Packed").expect("parse") {
+            Some(LayoutType::Packed)
+        } else {
+            None
+        }
+    }
+
+    pub fn unparse(&self, dict: &mut impl TypeDict) -> DesugaredTypeTerm {
+        match self {
+            LayoutType::Aligned => dict.parse_desugared("Aligned").unwrap(),
+            LayoutType::Packed => dict.parse_desugared("Packed").unwrap()
+        }
+    }
+}
+
+#[derive(Clone)]
+pub struct StructLayout {
+    pub ty: laddertypes::DesugaredTypeTerm,
+    pub layout: LayoutType,
+    pub members: Vec< StructMember >,
+    offsets: std::collections::HashMap< String, u64 >,
+    size: ObjectSize
+}
+
+impl StructLayout {
+    pub fn get_type(&self) -> DesugaredTypeTerm {
+        self.ty.clone()
+    }
+
+    pub fn get_size(&self) -> ObjectSize {
+        self.size
+    }
+
+    pub fn get_offset(&self, name: &String) -> u64 {
+        *self.offsets.get(name).expect("")
+    }
+
+    pub fn init_offsets(&mut self, dict: &mut impl TypeDict) {
+        let mut offset = 0;
+
+        for StructMember{symbol: field_name, ty: field_type} in self.members.iter() {
+            //let field_c_type = crate::c_gen::get_c_repr_type(dict, field_type.clone(), true).expect("cant get c-repr for struct field");
+            match get_type_size( dict, field_type.clone() ) {
+                ObjectSize::Static(field_size) => {
+                    match self.layout {
+                        LayoutType::Aligned => {
+                            // add padding to get natural alignment of current member
+                            if offset % field_size > 0 {
+                                offset = field_size * ((offset / field_size)+1);
+                            }
+                        }
+                        LayoutType::Packed => {
+                            // no padding
+                        }
+                    }
+
+                    // take offset
+                    self.offsets.insert(field_name.clone(), offset);
+
+                    // advance by current size
+                    offset += field_size;
+                }
+                ObjectSize::Dynamic() => {
+                    eprintln!("dynamically sized Field in struct!");
+                    self.offsets.insert(field_name.clone(), offset);
+                    self.size = ObjectSize::Dynamic();
+                    return;
+                }
+                ObjectSize::Unknown => {
+                    eprintln!("Struct member `{}` has unknown size!", field_name);
+                    self.offsets.insert(field_name.clone(), offset);
+                    self.size = ObjectSize::Unknown;
+                    return;
+                }
+            }
+        }
+
+        match self.size {
+            ObjectSize::Dynamic() => {
+
+            }
+            _ => {
+                self.size = ObjectSize::Static(offset);
+            }
+        }
+    }
+
+    pub fn parse(dict: &mut impl TypeDict, struct_type: &DesugaredTypeTerm) -> Option <Self> {
+        let st = struct_type.clone().strip().sugar(dict).normalize();
+        Self::parse_sugared(dict, st)
+    }
+
+    pub fn parse_sugared(dict: &mut impl TypeDict, st: TypeTerm) -> Option <Self> {
+        eprintln!("{}", st.pretty(dict, 0));
+        match st.clone() {
+            TypeTerm::Struct{ struct_repr, members } => {
+                let mut sl = StructLayout {
+                    ty: st.desugar(dict),
+                    layout: if let Some(sr) = struct_repr {
+                        let sr = sr.desugar(dict);
+                        LayoutType::parse( dict, &sr ).expect("invalid struct layout type")
+                    } else {
+                        eprintln!("choose default struct repr");
+                        LayoutType::Aligned
+                    },
+
+                    members,
+                    offsets: std::collections::HashMap::new(),
+                    size: ObjectSize::Unknown
+                };
+                sl.init_offsets(dict);
+
+                Some(sl)
+            }
+
+            _ => {
+                eprintln!("not a struct");
+                None
+            }
+        }
+    }
+}

test/test.sh

@@ -8,13 +8,12 @@ run_test_case() {
 -----------------------------------------------------------------------------
 Running test case ${TEST_NAME}"
 
-    ldmc "${SRC_TYPE}" "${DST_TYPE}" ../morphisms/*.morphism-base 2>|.tmp/ldmc_err 1>| target/src/${TEST_NAME}.c \
+    ldmc -m "main : ${SRC_TYPE} --> ${DST_TYPE}" -o target/src/${TEST_NAME}.c 2>|.tmp/ldmc_err  \
     || (echo "... error at generation:"; cat .tmp/ldmc_err; return -1);
 
     gcc -I../morphisms/runtime/include target/src/${TEST_NAME}.c -o target/${TEST_NAME} \
     || (echo "... error at compilation:"; return -2);
 
-
     LEN="$(echo -n "${EXPECT}" | wc -c)"
     RESULT="$(echo -n ${INPUT} | ./target/${TEST_NAME} 2>.tmp/target_err | head -c ${LEN})"