Cosmo/src/cstate.c

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C
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#include "cstate.h"
#include "cchunk.h"
#include "cobj.h"
#include "cvm.h"
#include "cmem.h"
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#include <string.h>
CState *cosmoV_newState() {
// we use C's malloc because we don't want to trigger a GC with an invalid state
CState *state = malloc(sizeof(CState));
if (state == NULL) {
CERROR("failed to allocate memory!");
exit(1);
}
state->panic = false;
state->freezeGC = false;
// GC
state->objects = NULL;
state->userRoots = NULL;
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state->grayStack.count = 0;
state->grayStack.capacity = 2;
state->grayStack.array = NULL;
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state->allocatedBytes = 0;
state->nextGC = 1024 * 8; // threshhold starts at 8kb
// init stack
state->top = state->stack;
state->frameCount = 0;
state->openUpvalues = NULL;
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state->protoObj = NULL;
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cosmoT_initTable(state, &state->strings, 8); // init string table
cosmoT_initTable(state, &state->globals, 8); // init global table
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// first, set all strings to NULL so our GC doesn't read garbage data
for (int i = 0; i < ISTRING_MAX; i++)
state->iStrings[i] = NULL;
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// setup all strings used by the VM
state->iStrings[ISTRING_INIT] = cosmoO_copyString(state, "__init", 6);
state->iStrings[ISTRING_INDEX] = cosmoO_copyString(state, "__index", 7);
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state->iStrings[ISTRING_NEWINDEX] = cosmoO_copyString(state, "__newindex", 10);
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// getters/setters
state->iStrings[ISTRING_GETTER] = cosmoO_copyString(state, "__getter", 8);
state->iStrings[ISTRING_SETTER] = cosmoO_copyString(state, "__setter", 8);
// for iterators
state->iStrings[ISTRING_ITER] = cosmoO_copyString(state, "__iter", 6);
state->iStrings[ISTRING_NEXT] = cosmoO_copyString(state, "__next", 6);
// for reserved members for objects
state->iStrings[ISTRING_RESERVED] = cosmoO_copyString(state, "__reserved", 10);
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// set the IString flags
for (int i = 0; i < ISTRING_MAX; i++)
state->iStrings[i]->isIString = true;
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return state;
}
void cosmoV_freeState(CState *state) {
#ifdef GC_DEBUG
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printf("state %p is being freed!\n", state);
#endif
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// frees all the objects
CObj *objs = state->objects;
while (objs != NULL) {
CObj *next = objs->next;
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cosmoO_free(state, objs);
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objs = next;
}
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// mark our internal VM strings NULL
for (int i = 0; i < ISTRING_MAX; i++)
state->iStrings[i] = NULL;
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// free our string & global table (the string table includes the internal VM strings)
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cosmoT_clearTable(state, &state->strings);
cosmoT_clearTable(state, &state->globals);
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// free our gray stack & finally free the state structure
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free(state->grayStack.array);
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free(state);
}
// expects 2*pairs values on the stack, each pair should consist of 1 key and 1 value
void cosmoV_register(CState *state, int pairs) {
for (int i = 0; i < pairs; i++) {
StkPtr key = cosmoV_getTop(state, 1);
StkPtr val = cosmoV_getTop(state, 0);
CValue *oldVal = cosmoT_insert(state, &state->globals, *key);
*oldVal = *val;
cosmoV_setTop(state, 2); // pops the 2 values off the stack
}
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}
void cosmoV_printStack(CState *state) {
printf("==== [[ stack dump ]] ====\n");
for (CValue *top = state->top - 1; top >= state->stack; top--) {
printf("%d: ", (int)(top - state->stack));
printValue(*top);
printf("\n");
}
}