89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "memory.h"
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#include "object.h"
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#include "value.h"
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#include "vm.h"
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#include "table.h"
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#define ALLOCATE_OBJECT(type, objectType) \
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(type*)allocateObject(sizeof(type), objectType)
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static KrkObj * allocateObject(size_t size, ObjType type) {
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KrkObj * object = (KrkObj*)krk_reallocate(NULL, 0, size);
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object->type = type;
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object->next = vm.objects;
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vm.objects = object;
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return object;
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}
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static KrkString * allocateString(char * chars, size_t length, uint32_t hash) {
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KrkString * string = ALLOCATE_OBJECT(KrkString, OBJ_STRING);
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string->length = length;
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string->chars = chars;
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string->hash = hash;
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krk_tableSet(&vm.strings, OBJECT_VAL(string), NONE_VAL());
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return string;
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}
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static uint32_t hashString(const char * key, size_t length) {
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uint32_t hash = 0;
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/* This is the so-called "sdbm" hash. It comes from a piece of
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* public domain code from a clone of ndbm. */
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for (size_t i = 0; i < length; ++i) {
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hash = (int)key[i] + (hash << 6) + (hash << 16) - hash;
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}
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return hash;
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}
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KrkString * takeString(char * chars, size_t length) {
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uint32_t hash = hashString(chars, length);
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KrkString * interned = tableFindString(&vm.strings, chars, length, hash);
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if (interned != NULL) {
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FREE_ARRAY(char, chars, length + 1);
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return interned;
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}
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return allocateString(chars, length, hash);
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}
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KrkString * copyString(const char * chars, size_t length) {
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uint32_t hash = hashString(chars, length);
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KrkString * interned = tableFindString(&vm.strings, chars, length, hash);
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if (interned != NULL) return interned;
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char * heapChars = ALLOCATE(char, length + 1);
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memcpy(heapChars, chars, length);
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heapChars[length] = '\0';
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return allocateString(heapChars, length, hash);
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}
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void krk_printObject(FILE * f, KrkValue value) {
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switch (OBJECT_TYPE(value)) {
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case OBJ_STRING:
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fprintf(f, "%s", AS_CSTRING(value));
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break;
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case OBJ_FUNCTION:
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if (AS_FUNCTION(value)->name == NULL) fprintf(f, "<module>");
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else fprintf(f, "<def %s>", AS_FUNCTION(value)->name->chars);
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break;
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case OBJ_NATIVE:
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fprintf(f, "<native bind>");
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break;
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}
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}
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KrkFunction * newFunction() {
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KrkFunction * function = ALLOCATE_OBJECT(KrkFunction, OBJ_FUNCTION);
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function->arity = 0;
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function->name = NULL;
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krk_initChunk(&function->chunk);
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return function;
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}
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KrkNative * newNative(NativeFn function) {
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KrkNative * native = ALLOCATE_OBJECT(KrkNative, OBJ_NATIVE);
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native->function = function;
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return native;
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}
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