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555 lines
13 KiB
555 lines
13 KiB
#include <stdbool.h>
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#include <stdint.h>
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#include <sysexits.h>
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#include <assert.h>
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#define USE_TAG 1
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#define USE_GC 1
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#if (USE_GC)
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# include <gc.h>
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#endif
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void *xmalloc(size_t n)
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{
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#if (USE_GC)
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void *mem= GC_malloc(n);
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#else
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void *mem= calloc(1, n);
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#endif
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assert(mem);
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return mem;
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}
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void *xrealloc(void *p, size_t n)
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{
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#if (USE_GC)
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void *mem= GC_realloc(p, n);
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#else
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void *mem= realloc(p, n);
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#endif
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assert(mem);
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return mem;
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}
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char *xstrdup(char *s)
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{
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#if (USE_GC)
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size_t len= strlen(s);
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char *mem= GC_malloc_atomic(len + 1);
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memcpy(mem, s, len + 1);
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#else
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char *mem= strdup(s);
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#endif
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assert(mem);
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return mem;
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}
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#define malloc(n) xmalloc(n)
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#define realloc(o, n) xrealloc(o, n)
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#define strdup(s) xstrdup(s)
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typedef enum {
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Undefined,
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Integer,
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String,
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Symbol,
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Function,
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Map
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} type_t;
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union object;
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typedef union object *oop;
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struct Undefined {
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type_t type;
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};
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struct Integer {
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type_t type;
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int _value;
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};
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struct String {
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type_t type;
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char *value;
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size_t size;
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};
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struct Symbol {
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type_t type;
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char *name;
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#ifdef SYMBOL_PAYLOAD
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SYMBOL_PAYLOAD
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#endif //SYMBOL_PAYLOAD
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};
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typedef oop (*primitive_t)(oop params);
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struct Function {
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type_t type;
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primitive_t primitive;
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oop name;
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oop body;
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oop param;
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oop parentScope;
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oop fixed;
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};
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// usefull for map's elements
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struct Pair {
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oop key;
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oop value;
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};
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struct Map {
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type_t type;
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struct Pair *elements; // even are keys, odd are values [ key val key val key val ]
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size_t size;
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size_t capacity;
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};
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union object {
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type_t type;
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struct Undefined Undefined;
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struct Integer Integer;
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struct String String;
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struct Symbol Symbol;
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struct Function Function;
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struct Map Map;
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};
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union object _null = {.Undefined = {Undefined}};
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oop null = &_null;
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int is(type_t type, oop obj);
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int isInteger(oop obj)
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{
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#if (USE_TAG)
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return (intptr_t)obj & 1;
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#else
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return is(Integer, obj);
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#endif
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}
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#if (USE_TAG)
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# define getType(PTR) (((intptr_t)(PTR) & 1) ? Integer : (PTR)->type)
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#else
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type_t getType(oop ptr)
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{
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assert(ptr);
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return ptr->type;
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}
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#endif
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int is(type_t type, oop obj)
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{
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return type == getType(obj);
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}
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oop _checkType(oop ptr, type_t type, char *file, int line)
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{
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assert(ptr);
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if (getType(ptr) != type) {
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fprintf(stderr, "\n%s:%i: expected %i got %i\n", file, line, type, ptr->type);
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}
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assert(getType(ptr) == type);
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return ptr;
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}
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// added parens around expansion to protect assignment
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#define get(PTR, TYPE, FIELD) (_checkType(PTR, TYPE, __FILE__, __LINE__)->TYPE.FIELD)
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#define set(PTR, TYPE, FIELD, VALUE) (_checkType(PTR, TYPE, __FILE__, __LINE__)->TYPE.FIELD = VALUE)
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void *memcheck(void *ptr)
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{
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if (NULL == ptr) {
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fprintf(stderr, "Error: out of memory\n");
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exit(EX_OSERR); // this is as close as we have for 'resource unavailable'
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}
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return ptr;
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}
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void print(oop ast);
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void println(oop ast);
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int getInteger(oop obj)
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{
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if (!isInteger(obj)) {
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fprintf(stderr, "\nNon-integer in arithmetic expression\n");
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exit(1);
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}
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#if (USE_TAG)
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return (intptr_t)obj >> 1;
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#else
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return get(obj, Integer, _value);
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#endif
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}
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oop makeInteger(int value)
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{
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#if (USE_TAG)
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return (oop) (((intptr_t)value << 1) | 1);
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#else
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oop newInt = memcheck(malloc(sizeof(union object)));
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newInt->type = Integer;
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newInt->Integer._value = value;
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return newInt;
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#endif
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}
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oop makeString(char *value)
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{
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oop newString = memcheck(malloc(sizeof(union object)));
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newString->type = String;
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newString->String.value = memcheck(strdup(value));
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newString->String.size = strlen(value);
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return newString;
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}
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size_t string_size(oop s)
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{
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return get(s, String, size);
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}
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oop string_concat(oop str1, oop str2)
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{
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size_t len = string_size(str1) + string_size(str2);
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char *concat = memcheck(malloc(sizeof(char) * len + 1));
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memcpy(concat, get(str1, String, value), string_size(str1));
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memcpy(concat + string_size(str1), get(str2, String, value), string_size(str2));
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concat[len]= '\0';
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oop newString = memcheck(malloc(sizeof(union object)));
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newString->type = String;
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newString->String.value = concat;
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newString->String.size = len;
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return newString;
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}
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oop string_mul(oop str, oop factor)
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{
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ssize_t len = string_size(str) * getInteger(factor);
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if (len < 0) len = 0;
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char *concat = memcheck(malloc(sizeof(char) * len + 1));
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for (int i=0; i < getInteger(factor); ++i) {
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memcpy(concat + (i * string_size(str)), get(str, String, value), string_size(str));
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}
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concat[len]= '\0';
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oop newString = memcheck(malloc(sizeof(union object)));
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newString->type = String;
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newString->String.value = concat;
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newString->String.size = len;
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return newString;
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}
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oop makeSymbol(char *name)
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{
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oop newSymb = memcheck(malloc(sizeof(union object)));
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newSymb->type = Symbol;
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newSymb->Symbol.name = memcheck(strdup(name));
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newSymb->Symbol.prototype = 0;
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return newSymb;
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}
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oop makeFunction(primitive_t primitive, oop name, oop param, oop body, oop parentScope, oop fixed)
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{
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oop newFunc = memcheck(malloc(sizeof(union object)));
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newFunc->type = Function;
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newFunc->Function.primitive = primitive;
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newFunc->Function.name = name;
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newFunc->Function.param = param;
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newFunc->Function.body = body;
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newFunc->Function.parentScope = parentScope;
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newFunc->Function.fixed = fixed;
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return newFunc;
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}
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oop makeMap()
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{
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oop newMap = memcheck(malloc(sizeof(union object)));
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newMap->type = Map;
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return newMap;
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}
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size_t map_size(oop map)
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{
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assert(is(Map, map));
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return get(map, Map, size);
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}
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bool map_hasIntegerKey(oop map, size_t index)
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{
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if (index >= map_size(map)) return 0;
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oop key= get(map, Map, elements)[index].key;
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if (!isInteger(key)) return 0;
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return index == getInteger(key);
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}
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int oopcmp(oop a, oop b)
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{
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type_t ta = getType(a), tb = getType(b);
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if (ta == tb) {
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switch (getType(a)) {
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case Integer:
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return getInteger(a) - getInteger(b);
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case String:
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return strcmp(get(a, String, value), get(b, String, value));
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default:
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if (a < b) return -1;
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if (a > b) return 1;
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return 0;
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}
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}
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return ta - tb;
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}
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ssize_t map_search(oop map, oop key)
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{
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assert(is(Map, map));
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assert(key);
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ssize_t r = map_size(map) - 1;
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if (isInteger(key)) {
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ssize_t index = getInteger(key);
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if (index <= r) {
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oop probe = get(map, Map, elements)[index].key;
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if (key == probe) return index;
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}
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}
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ssize_t l = 0;
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while (l <= r) {
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ssize_t mid = (l + r) / 2;
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int cmpres = oopcmp(get(map, Map, elements)[mid].key, key);
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if (cmpres > 0) r = mid - 1;
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else if (cmpres < 0) l = mid + 1;
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else return mid; // non-negative result => element found at this index
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}
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return -1 - l; // negative result => 'not found', reflected around -1 instead of 0 to allow 'not found' at index 0
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}
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bool map_hasKey(oop map, oop key)
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{
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assert(is(Map, map));
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assert(key);
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return map_search(map, key) >= 0;
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}
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oop map_get(oop map, oop key)
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{
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assert(is(Map, map));
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assert(key);
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ssize_t pos = map_search(map, key);
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if (pos < 0) return null;
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return get(map, Map, elements)[pos].value;
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}
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#define MAP_CHUNK_SIZE 8
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oop map_insert(oop map, oop key, oop value, size_t pos)
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{
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assert(is(Map, map));
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assert(key);
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assert(value);
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if (pos > map_size(map)) { // don't need to check for pos < 0 because size_t is unsigned
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fprintf(stderr, "\nTrying to insert in a map out of bound\n");
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assert(-1);
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}
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// check capacity and expand if needed
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if (map_size(map) >= get(map, Map, capacity)) {
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size_t newCapacity = get(map, Map, capacity) + MAP_CHUNK_SIZE;
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set(map, Map, elements, memcheck(realloc(get(map, Map, elements), sizeof(struct Pair) * newCapacity)));
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set(map, Map, capacity, newCapacity);
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}
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// insert
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memmove(get(map, Map, elements) + pos + 1, get(map, Map, elements) + pos, sizeof(struct Pair) * (map_size(map) - pos));
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// Maybe this syntax is not very nice and I should access the Pair stuff differently?
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// I mean modifying something on a line that begin with "get"... :/
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get(map, Map, elements)[pos].value = value;
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get(map, Map, elements)[pos].key = key;
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set(map, Map, size, map_size(map) + 1);
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return value;
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}
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oop map_set(oop map, oop key, oop value)
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{
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assert(is(Map, map));
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assert(key);
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assert(value);
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ssize_t pos = map_search(map, key);
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if (pos >= 0) {
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get(map, Map, elements)[pos].value = value;
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} else {
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pos = -1 - pos;
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map_insert(map, key, value, pos);
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}
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return value;
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}
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oop map_del(oop map, oop key)
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{
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assert(is(Map, map));
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assert(is(String, key));
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ssize_t pos = map_search(map, key);
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if (pos < 0) return map;
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if (pos < map_size(map) - 1) {
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memmove(get(map, Map, elements) + pos, get(map, Map, elements) + pos + 1, sizeof(struct Pair) * (map_size(map) - pos));
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}
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set(map, Map, size, map_size(map) - 1);
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return map;
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}
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oop map_append(oop map, oop value)
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{
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return map_set(map, makeInteger(map_size(map)), value);
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}
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bool isHidden(oop obj) {
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if (is(Symbol, obj)) {
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char *s = get(obj, Symbol, name);
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size_t l = strlen(s);
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// maybe 'l > 5' because of ____?
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return (l > 4 && s[0] == '_' && s[1] == '_' && s[l-2] == '_' && s[l-1] == '_');
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}
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return false;
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}
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oop map_keys(oop map)
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{
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assert(is(Map, map));
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oop keys = makeMap();
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for (size_t i = 0; i < get(map, Map, size); i++) {
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if (!isHidden(get(map, Map, elements)[i].key)) {
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map_append(keys, get(map, Map, elements)[i].key);
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}
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}
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return keys;
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}
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oop map_allKeys(oop map)
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{
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assert(is(Map, map));
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oop keys = makeMap();
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for (size_t i = 0; i < get(map, Map, size); i++) {
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map_append(keys, get(map, Map, elements)[i].key);
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}
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return keys;
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}
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oop map_values(oop map)
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{
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assert(is(Map, map));
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oop values = makeMap();
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for (size_t i = 0; i < get(map, Map, size); i++) {
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if (!isHidden(get(map, Map, elements)[i].key)) {
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map_append(values, get(map, Map, elements)[i].value);
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}
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}
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return values;
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}
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void map_print(oop map, int ident)
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{
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assert(is(Map, map));
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if (ident == 0) {
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printf("{");
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map_print(map, ident + 1);
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printf("}");
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return;
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}
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for (size_t i = 0; i < map_size(map); i++) {
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printf("\n");
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for (size_t i = 0; i < ident; i++) {
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printf("|");
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printf(" ");
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}
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// todo: a key could be a map itself
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print(get(map, Map, elements)[i].key);
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printf(": ");
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oop rhs = get(map, Map, elements)[i].value;
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if (getType(rhs) == Map) {
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map_print(rhs, ident + 1);
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} else {
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print(rhs);
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}
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if (i < map_size(map) - 1) printf(",");
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if (ident == 1 && i == map_size(map) - 1) printf("\n");
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}
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return;
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}
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void print(oop ast)
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{
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assert(ast);
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switch (getType(ast)) {
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case Undefined:
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printf("null");
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return;
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case Integer:
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printf("%i", getInteger(ast));
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return;
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case String:
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printf("%s", get(ast, String, value));
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return;
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case Symbol:
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printf("%s", get(ast, Symbol, name));
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return;
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case Function:
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if (get(ast, Function, primitive) == NULL) {
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printf("Function:");
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} else {
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printf("Primitive:");
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}
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print(get(ast, Function, name));
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printf("(");
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print(get(ast, Function, param));
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printf(")");
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return;
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case Map:
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map_print(ast, 0);
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return;
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}
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assert(0);
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}
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void println(oop ast)
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{
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print(ast);
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printf("\n");
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}
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oop symbol_table;
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ssize_t map_intern_search(oop map, char* ident)
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{
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assert(is(Map, map));
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assert(ident);
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ssize_t l = 0, r = map_size(map) - 1;
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while (l <= r) {
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ssize_t mid = (l + r) / 2;
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int cmpres = strcmp(get(get(map, Map, elements)[mid].key, Symbol, name), ident);
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if (cmpres > 0) r = mid - 1;
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else if (cmpres < 0) l = mid + 1;
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else return mid; // non-negative result => element found at this index
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}
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return -1 - l; // negative result => 'not found', reflected around -1 instead of 0 to allow 'not found' at index 0
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}
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oop intern(char *ident)
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{
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assert(ident);
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ssize_t pos = map_intern_search(symbol_table, ident);
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if (pos >= 0) return get(symbol_table, Map, elements)[pos].key;
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pos = -1 - pos; // 'un-negate' the result by reflecting it around X=-1
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oop symbol = makeSymbol(ident);
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map_insert(symbol_table, symbol, null, pos);
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return symbol;
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}
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