struct-vis/table.h

#define TABLE_KEY_SIZE 64
#define TABLE_NUM_LANES 32
static inline unsigned int APHash(const char* str, unsigned int length) {
   unsigned int hash = 0xAAAAAAAA;
   unsigned int i    = 0;

   for (i = 0; i < length; ++str, ++i)
   {
      hash ^= ((i & 1) == 0) ? (  (hash <<  7) ^ (*str) * (hash >> 3)) :
                               (~((hash << 11) + ((*str) ^ (hash >> 5))));
   }

   return hash;
}

static inline uint32_t fastModuloReductionDanielLemire(uint32_t v, uint32_t c) {
    return (((uint64_t)v) * ((uint64_t)c)) >> 32;
}

static inline uint32_t hash(const char* key, uint32_t keyLength, uint32_t capacity) {
    uint32_t value = APHash(key, keyLength);

    return fastModuloReductionDanielLemire(value, capacity);
}

typedef struct TableEntry {
    struct TableEntry* next;

    const char key[TABLE_KEY_SIZE];
    ssize_t size;
    ssize_t align;
} TableEntry;

typedef struct Table {
    TableEntry **entries;
} Table;

static inline TableEntry* lookup(Table *table, const char key[TABLE_KEY_SIZE]) {
    TableEntry *entry = table->entries[hash(key, TABLE_KEY_SIZE, TABLE_NUM_LANES)];

    for (; entry != NULL; entry = entry->next) {
        if (memcmp(entry->key, key, TABLE_KEY_SIZE) == 0) {
            return entry;
        }
    }

    return NULL;
}

static inline void insert(Table *table, const char key[TABLE_KEY_SIZE], ssize_t size, ssize_t align) {
    TableEntry *entry = lookup(table, key);

    if (!entry) { // no entry with that key exists
        entry = (TableEntry*) calloc(sizeof(TableEntry), 1);
        strWrite((char*)entry->key, key, TABLE_KEY_SIZE);
        entry->size = size;
        entry->align = align;

        unsigned int hashValue = hash(key, TABLE_KEY_SIZE, TABLE_NUM_LANES);
        entry->next = table->entries[hashValue];
        table->entries[hashValue] = entry;

    } else { // entry already exists, replace its value
        entry->size = size;
        entry->align = align;
    }
}

static inline void insertPadZeroes(Table* table, const char* keyToPad, ssize_t size, ssize_t align) {
    char scratch[64] = { 0 };
    for (int i = 0; i < TABLE_KEY_SIZE; i++) {
        if (keyToPad[i] == '\0') break;
        scratch[i] = keyToPad[i];
    }

    insert(table, scratch, size, align);
}

static inline void traversePrint(Table *table) {
    for (unsigned int i = 0; i < TABLE_NUM_LANES; i++) {
        TableEntry *entry = table->entries[i];

        while (entry != NULL) {
            printf("entry key: %-64s, size: %lu, align: %lu\n", entry->key, entry->size, entry->align);
            entry = entry->next;
        }
    }
}

static inline Table* initTable() {
    Table *table = malloc(sizeof(Table));
    table->entries = (TableEntry**) calloc(sizeof(TableEntry*), TABLE_NUM_LANES);

    insertPadZeroes(table, "char", sizeof(char), sizeof(char));
    insertPadZeroes(table, "signed char", sizeof(signed char), sizeof(signed char));
    insertPadZeroes(table, "unsigned char", sizeof(unsigned char), sizeof(unsigned char));
    insertPadZeroes(table, "short", sizeof(short), sizeof(short));
    insertPadZeroes(table, "short int", sizeof(short int), sizeof(short int));
    insertPadZeroes(table, "signed short", sizeof(signed short), sizeof(signed short));
    insertPadZeroes(table, "signed short int", sizeof(signed short int), sizeof(signed short int));
    insertPadZeroes(table, "unsigned short", sizeof(unsigned short), sizeof(unsigned short));
    insertPadZeroes(table, "unsigned short int", sizeof(unsigned short int), sizeof(unsigned short int));
    insertPadZeroes(table, "int", sizeof(int), sizeof(int));
    insertPadZeroes(table, "signed", sizeof(signed), sizeof(signed));
    insertPadZeroes(table, "signed int", sizeof(signed int), sizeof(signed int));
    insertPadZeroes(table, "unsigned", sizeof(unsigned), sizeof(unsigned));
    insertPadZeroes(table, "unsigned int", sizeof(unsigned int), sizeof(unsigned int));
    insertPadZeroes(table, "long", sizeof(long), sizeof(long));
    insertPadZeroes(table, "long int", sizeof(long int), sizeof(long int));
    insertPadZeroes(table, "signed long", sizeof(signed long), sizeof(signed long));
    insertPadZeroes(table, "signed long int", sizeof(signed long int), sizeof(signed long int));
    insertPadZeroes(table, "unsigned long", sizeof(unsigned long), sizeof(unsigned long));
    insertPadZeroes(table, "unsigned long int", sizeof(unsigned long int), sizeof(unsigned long int));
    insertPadZeroes(table, "long long", sizeof(long long), sizeof(long long));
    insertPadZeroes(table, "long long int", sizeof(long long int), sizeof(long long int));
    insertPadZeroes(table, "signed long long", sizeof(signed long long), sizeof(signed long long));
    insertPadZeroes(table, "signed long long int", sizeof(signed long long int), sizeof(signed long long int));
    insertPadZeroes(table, "unsigned long long", sizeof(unsigned long long), sizeof(unsigned long long));
    insertPadZeroes(table, "unsigned long long int", sizeof(unsigned long long int), sizeof(unsigned long long int));
    insertPadZeroes(table, "float", sizeof(float), sizeof(float));
    insertPadZeroes(table, "double", sizeof(double), sizeof(double));
    insertPadZeroes(table, "long double", sizeof(long double), sizeof(long double));

    insertPadZeroes(table, "size_t", sizeof(size_t), sizeof(size_t));
    insertPadZeroes(table, "ssize_t", sizeof(ssize_t), sizeof(ssize_t));
    insertPadZeroes(table, "bool", sizeof(bool), sizeof(bool));
    insertPadZeroes(table, "_Bool", sizeof(_Bool), sizeof(_Bool));

    //char
    //signed char
    //unsigned char
    //short
    //short int
    //signed short
    //signed short int
    //unsigned short
    //unsigned short int
    //int
    //signed
    //signed int
    //unsigned
    //unsigned int
    //long
    //long int
    //signed long
    //signed long int
    //unsigned long
    //unsigned long int
    //long long
    //long long int
    //signed long long
    //signed long long int
    //unsigned long long
    //unsigned long long int
    //float
    //double
    //long double

    //traversePrint(table);

    return table;
}

static Table *typeTable;