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#include <stdio.h>
#include <string.h>
#include "memory.h"
#include "object.h"
#include "table.h"
#include "value.h"
#include "vm.h"
#define ALLOCATE_OBJ(type, objectType) \
(type *)allocateObject(sizeof(type), objectType)
static Obj *allocateObject(size_t size, ObjType type) {
Obj *object = (Obj *)reallocate(NULL, 0, size);
object->type = type;
object->isMarked = false;
object->next = vm.objects;
vm.objects = object;
#ifdef DEBUG_LOG_GC
printf("%p allocate %zu for %d", (void *)object, size, type);
#endif
return object;
}
ObjBoundMethod *newBoundMethod(Value receiver, ObjClosure *method) {
ObjBoundMethod *bound = ALLOCATE_OBJ(ObjBoundMethod, OBJ_BOUND_METHOD);
bound->receiver = receiver;
bound->method = method;
return bound;
}
ObjClass *newClass(ObjString *name) {
ObjClass *klass = ALLOCATE_OBJ(ObjClass, OBJ_CLASS);
klass->name = name;
initTable(&klass->methods);
return klass;
}
ObjClosure *newClosure(ObjFunction *function) {
ObjUpvalue **upvalues = ALLOCATE(ObjUpvalue *, function->upvalueCount);
for (int i = 0; i < function->upvalueCount; i++) {
upvalues[i] = NULL;
}
ObjClosure *closure = ALLOCATE_OBJ(ObjClosure, OBJ_CLOSURE);
closure->function = function;
closure->upvalues = upvalues;
closure->upvalueCount = function->upvalueCount;
return closure;
}
ObjFunction *newFunction() {
ObjFunction *function = ALLOCATE_OBJ(ObjFunction, OBJ_FUNCTION);
function->arity = 0;
function->upvalueCount = 0;
function->name = NULL;
initChunk(&function->chunk);
return function;
}
ObjInstance *newInstance(ObjClass *klass) {
ObjInstance *instance = ALLOCATE_OBJ(ObjInstance, OBJ_INSTANCE);
instance->klass = klass;
initTable(&instance->fields);
return instance;
}
ObjNative *newNative(NativeFn function) {
ObjNative *native = ALLOCATE_OBJ(ObjNative, OBJ_NATIVE);
native->function = function;
return native;
}
static ObjString *allocateString(char *chars, int length, uint32_t hash) {
ObjString *string = ALLOCATE_OBJ(ObjString, OBJ_STRING);
string->length = length;
string->chars = chars;
string->hash = hash;
push(OBJ_VAL(string));
tableSet(&vm.strings, string, NIL_VAL);
pop();
return string;
}
static uint32_t hashString(const char *key, int length) {
uint32_t hash = 2166136261u;
for (int i = 0; i < length; i++) {
hash ^= (uint32_t)key[i];
hash *= 16777619;
}
return hash;
}
ObjString *takeString(char *chars, int length) {
uint32_t hash = hashString(chars, length);
ObjString *interned = tableFindString(&vm.strings, chars, length, hash);
if (interned != NULL) {
FREE_ARRAY(char, chars, length + 1);
return interned;
}
return allocateString(chars, length, hash);
}
ObjString *copyString(const char *chars, int length) {
uint32_t hash = hashString(chars, length);
ObjString *interned = tableFindString(&vm.strings, chars, length, hash);
if (interned != NULL)
return interned;
char *heapChars = ALLOCATE(char, length + 1);
memcpy(heapChars, chars, length);
heapChars[length] = '\0';
return allocateString(heapChars, length, hash);
}
ObjUpvalue *newUpvalue(Value *slot) {
ObjUpvalue *upvalue = ALLOCATE_OBJ(ObjUpvalue, OBJ_UPVALUE);
upvalue->closed = NIL_VAL;
upvalue->location = slot;
upvalue->next = NULL;
return upvalue;
}
static void printFunction(ObjFunction *function) {
if (function->name == NULL) {
printf("<script>");
return;
}
printf("<fn %s>", function->name->chars);
}
void printObject(Value value) {
switch (OBJ_TYPE(value)) {
case OBJ_BOUND_METHOD:
printFunction(AS_BOUND_METHOD(value)->method->function);
break;
case OBJ_CLASS:
printf("%s", AS_CLASS(value)->name->chars);
break;
case OBJ_CLOSURE:
printFunction(AS_CLOSURE(value)->function);
break;
case OBJ_FUNCTION:
printFunction(AS_FUNCTION(value));
break;
case OBJ_INSTANCE:
printf("%s instance", AS_INSTANCE(value)->klass->name->chars);
break;
case OBJ_NATIVE:
printf("<native fn>");
break;
case OBJ_STRING:
printf("%s", AS_CSTRING(value));
break;
case OBJ_UPVALUE:
printf("upvalue");
break;
}
}
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