better GC debugging, added base object for tables

src/cbaselib.c

@@ -1,9 +1,12 @@
 #include "cbaselib.h"
 #include "cvalue.h"
 #include "cobj.h"
+#include "cmem.h"
 
 void cosmoB_loadlibrary(CState *state) {
+    cosmoM_freezeGC(state);
     cosmoV_register(state, "print", cosmoV_newObj(cosmoO_newCFunction(state, cosmoB_print)));
+    cosmoM_unfreezeGC(state);
 }
 
 int cosmoB_print(CState *state, int nargs, CValue *args) {

src/cmem.c

@@ -20,6 +20,11 @@ void *cosmoM_reallocate(CState* state, void *buf, size_t oldSize, size_t newSize
     if (!(cosmoM_isFrozen(state)) && newSize > oldSize) {
         cosmoM_collectGarbage(state);
     }
+#ifdef GC_DEBUG
+    else {
+        printf("GC event ignored! state frozen! [%d]\n", state->freezeGC);
+    }
+#endif
 #else
     // if the state isn't frozen && we've reached the GC event
     if (!(cosmoM_isFrozen(state)) && state->allocatedBytes > state->nextGC) {
@@ -75,12 +80,12 @@ void markArray(CState *state, CValueArray *array) {
 void blackenObject(CState *state, CObj *obj) {
     switch (obj->type) {
         case COBJ_STRING:
+        case COBJ_TABLE: // TODO: when metatables are added, make sure they're marked
         case COBJ_CFUNCTION:
             // stubbed
             break;
         case COBJ_UPVALUE: {
             markValue(state, ((CObjUpval*)obj)->closed);
-
             break;
         }
         case COBJ_FUNCTION: {

src/cmem.h

@@ -28,11 +28,22 @@
 #define cosmoM_isFrozen(state) \
     state->freezeGC > 0
 
+// if debugging, print the locations of when the state is frozen/unfrozen
+#ifdef GC_DEBUG
+#define cosmoM_freezeGC(state) \
+    state->freezeGC++; \
+    printf("freezing state at %s:%d [%d]\n", __FILE__, __LINE__, state->freezeGC)
+
+#define  cosmoM_unfreezeGC(state) \
+    state->freezeGC--; \
+    printf("unfreezing state at %s:%d [%d]\n", __FILE__, __LINE__, state->freezeGC)
+#else
 #define cosmoM_freezeGC(state) \
     state->freezeGC++
 
 #define  cosmoM_unfreezeGC(state) \
     state->freezeGC--
+#endif 
 
 COSMO_API void *cosmoM_reallocate(CState* state, void *buf, size_t oldSize, size_t newSize);
 COSMO_API void cosmoM_collectGarbage(CState* state);

src/cobj.c

@@ -42,6 +42,12 @@ void cosmoO_freeObject(CState *state, CObj* obj) {
             cosmoM_free(state, CObjString, objStr);
             break;
         }
+        case COBJ_TABLE: {
+            CObjTable *objTbl = (CObjTable*)obj;
+            cosmoT_clearTable(state, &objTbl->tbl);
+            cosmoM_free(state, CObjTable, objTbl);
+            break;
+        }
         case COBJ_UPVALUE: {
             cosmoM_free(state, CObjUpval, obj);
             break;
@@ -72,9 +78,21 @@ bool cosmoO_equalObject(CObj* obj1, CObj* obj2) {
     switch (obj1->type) {
         case COBJ_STRING:
             return obj1 == obj2; // compare pointers because we already intern all strings :)
-        default:
+        case COBJ_CFUNCTION: {
-            return false; // they're some unknown type, probably malformed :(
+            CObjCFunction *cfunc1 = (CObjCFunction*)obj1;
+            CObjCFunction *cfunc2 = (CObjCFunction*)obj2;
+            return cfunc1->cfunc == cfunc2->cfunc;
         }
+        default:
+            return false;
+    }
+}
+
+CObjTable *cosmoO_newTable(CState *state) {
+    CObjTable *tbl = (CObjTable*)cosmoO_allocateObject(state, sizeof(CObjTable), COBJ_TABLE);
+
+    cosmoT_initTable(state, &tbl->tbl, 8); // start the table at 8
+    return tbl;
 }
 
 CObjFunction *cosmoO_newFunction(CState *state) {
@@ -170,6 +188,11 @@ CObjString *cosmoO_toString(CState *state, CObj *val) {
             CObjFunction *func = (CObjFunction*)val;
             return func->name != NULL ? func->name : cosmoO_copyString(state, UNNAMEDCHUNK, strlen(UNNAMEDCHUNK)); 
         }
+        case COBJ_TABLE: { // TODO: maybe not safe??
+            char buf[64];
+            int sz = sprintf(buf, "<tbl> %p", val) + 1; // +1 for the null character
+            return cosmoO_copyString(state, buf, sz);
+        }
         default:
             return cosmoO_copyString(state, "<unkn>", 6);
     }
@@ -182,6 +205,10 @@ void printObject(CObj *o) {
             printf("\"%.*s\"", objStr->length, objStr->str);
             break;
         }
+        case COBJ_TABLE: {
+            printf("<tbl> %p", o);
+            return;
+        }
         case COBJ_UPVALUE: {
             CObjUpval *upval = (CObjUpval*)o;
             printf("<upvalue %p> -> ", upval->val);

src/cobj.h

@@ -4,15 +4,18 @@
 #include "cosmo.h"
 #include "cchunk.h"
 #include "cvalue.h"
+#include "ctable.h"
 
 typedef struct CState CState;
 
 typedef enum {
     COBJ_STRING,
-    COBJ_UPVALUE,
+    COBJ_TABLE,
     COBJ_FUNCTION,
     COBJ_CFUNCTION,
-    COBJ_CLOSURE
+    // internal use
+    COBJ_CLOSURE,
+    COBJ_UPVALUE,
 } CObjType;
 
 #define CommonHeader CObj obj;
@@ -32,12 +35,11 @@ typedef struct CObjString {
     uint32_t hash; // for hashtable lookup
 } CObjString;
 
-typedef struct CObjUpval {
+typedef struct CObjTable {
     CommonHeader; // "is a" CObj
-    CValue *val;
+    CTable tbl;
-    CValue closed;
+    //struct CObjTable *meta; // metatable, used to describe table behavior
-    struct CObjUpval *next;
+} CObjTable;
-} CObjUpval;
 
 typedef struct CObjFunction {
     CommonHeader; // "is a" CObj
@@ -53,18 +55,27 @@ typedef struct CObjCFunction {
 } CObjCFunction;
 
 typedef struct CObjClosure {
-    CommonHeader;
+    CommonHeader; // "is a" CObj
     CObjFunction *function;
     CObjUpval **upvalues;
     int upvalueCount;
 } CObjClosure;
 
+typedef struct CObjUpval {
+    CommonHeader; // "is a" CObj
+    CValue *val;
+    CValue closed;
+    struct CObjUpval *next;
+} CObjUpval;
+
 #define IS_STRING(x)    isObjType(x, COBJ_STRING)
+#define IS_TABLE(x)     isObjType(x, COBJ_TABLE)
 #define IS_FUNCTION(x)  isObjType(x, COBJ_FUNCTION)
 #define IS_CFUNCTION(x) isObjType(x, COBJ_CFUNCTION)
 #define IS_CLOSURE(x)   isObjType(x, COBJ_CLOSURE)
 
 #define cosmoV_readString(x)    ((CObjString*)cosmoV_readObj(x))
+#define cosmoV_readTable(x)     ((CObjTable*)cosmoV_readObj(x))
 #define cosmoV_readFunction(x)  ((CObjFunction*)cosmoV_readObj(x))
 #define cosmoV_readCFunction(x) (((CObjCFunction*)cosmoV_readObj(x))->cfunc)
 #define cosmoV_readClosure(x)   ((CObjClosure*)cosmoV_readObj(x))
@@ -78,6 +89,7 @@ void cosmoO_freeObject(CState *state, CObj* obj);
 
 bool cosmoO_equalObject(CObj* obj1, CObj* obj2);
 
+CObjTable *cosmoO_newTable(CState *state);
 CObjFunction *cosmoO_newFunction(CState *state);
 CObjCFunction *cosmoO_newCFunction(CState *state, CosmoCFunction func);
 CObjClosure *cosmoO_newClosure(CState *state, CObjFunction *func);

src/cstate.c

@@ -55,10 +55,10 @@ void cosmoV_freeState(CState *state) {
 
 void cosmoV_register(CState *state, const char *identifier, CValue val) {
     // we push the values so the garbage collector can find them
-    cosmoV_pushValue(state, cosmoV_newObj(cosmoO_copyString(state, identifier, strlen(identifier))));
     cosmoV_pushValue(state, val);
+    cosmoV_pushValue(state, cosmoV_newObj(cosmoO_copyString(state, identifier, strlen(identifier))));
 
-    CValue *oldVal = cosmoT_insert(state, &state->globals, *cosmoV_getTop(state, 1));
+    CValue *oldVal = cosmoT_insert(state, &state->globals, *cosmoV_getTop(state, 0));
     *oldVal = val;
     
     cosmoV_setTop(state, 2); // pops the 2 values off the stack

src/main.c

@@ -90,7 +90,6 @@ static void runFile(const char* fileName) {
     char* script = readFile(fileName);
     CState *state = cosmoV_newState();
 
-
     interpret(state, script);
 
     cosmoV_freeState(state);