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detect stack overflows
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84f7895684
commit
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@ -4,6 +4,7 @@
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#include "cchunk.h"
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#include "cdebug.h"
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#include "cmem.h"
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#include "cvm.h"
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#include <string.h>
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31
src/cstate.h
31
src/cstate.h
@ -33,6 +33,9 @@ typedef struct ArrayCObj {
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typedef struct CState {
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bool panic;
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int freezeGC; // when > 0, GC events will be ignored (for internal use)
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int frameCount;
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CObjObject *protoObj; // start met obj for all objects (NULL by default)
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CObj *objects; // tracks all of our allocated objects
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CObj *userRoots; // user definable roots, this holds CObjs that should be considered "roots", lets the VM know you are holding a reference to a CObj in your code
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ArrayCObj grayStack; // keeps track of which objects *haven't yet* been traversed in our GC, but *have been* found
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@ -44,12 +47,9 @@ typedef struct CState {
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CTable globals;
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CValue *top; // top of the stack
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CValue stack[STACK_MAX]; // stack
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CCallFrame callFrame[FRAME_MAX]; // call frames
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int frameCount;
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CObjString *iStrings[ISTRING_MAX]; // strings used internally by the VM, eg. __init, __index & friends
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CObjObject *protoObj; // start met obj for all objects (NULL by default)
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CCallFrame callFrame[FRAME_MAX]; // call frames
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CValue stack[STACK_MAX]; // stack
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} CState;
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COSMO_API CState *cosmoV_newState();
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@ -58,25 +58,4 @@ COSMO_API void cosmoV_register(CState *state, int pairs);
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COSMO_API void cosmoV_freeState(CState *state);
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COSMO_API void cosmoV_printStack(CState *state);
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// pushes value to the stack
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static inline void cosmoV_pushValue(CState *state, CValue val) {
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*(state->top++) = val;
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}
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// sets stack->top to stack->top - indx
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static inline StkPtr cosmoV_setTop(CState *state, int indx) {
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state->top -= indx;
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return state->top;
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}
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// returns stack->top - indx - 1
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static inline StkPtr cosmoV_getTop(CState *state, int indx) {
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return &state->top[-(indx + 1)];
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}
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// pops 1 value off the stack
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static inline StkPtr cosmoV_pop(CState *state) {
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return cosmoV_setTop(state, 1);
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}
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#endif
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@ -18,6 +18,7 @@ COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...) {
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void cosmoV_error(CState *state, const char *format, ...) {
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if (state->panic)
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return;
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state->panic = true;
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// print stack trace
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for (int i = 0; i < state->frameCount; i++) {
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@ -50,8 +51,7 @@ void cosmoV_error(CState *state, const char *format, ...) {
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va_end(args);
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printf("%.*s\n", errString->length, errString->str);
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cosmoV_printStack(state);
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state->panic = true;
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//cosmoV_printStack(state);
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}
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CObjUpval *captureUpvalue(CState *state, CValue *local) {
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@ -90,6 +90,11 @@ void closeUpvalues(CState *state, CValue *local) {
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}
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void pushCallFrame(CState *state, CObjClosure *closure, int args) {
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if (state->frameCount >= FRAME_MAX) {
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cosmoV_error(state, "Callframe overflow!");
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return;
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}
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CCallFrame *frame = &state->callFrame[state->frameCount++];
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frame->base = state->top - args - 1; // - 1 for the function
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frame->pc = closure->function->chunk.buf;
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36
src/cvm.h
36
src/cvm.h
@ -23,6 +23,42 @@ COSMO_API void cosmoV_error(CState *state, const char *format, ...);
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// nice to have wrappers
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// pushes value to the stack
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static inline void cosmoV_pushValue(CState *state, CValue val) {
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ptrdiff_t stackSize = state->top - state->stack;
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// we reserve 8 slots for the error string and whatever c api we might be in
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if (stackSize >= STACK_MAX - 8) {
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if (state->panic) { // we're in a panic state, let the 8 reserved slots be filled
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if (stackSize < STACK_MAX)
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*(state->top++) = val;
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return;
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}
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cosmoV_error(state, "Stack overflow!");
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return;
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}
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*(state->top++) = val;
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}
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// sets stack->top to stack->top - indx
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static inline StkPtr cosmoV_setTop(CState *state, int indx) {
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state->top -= indx;
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return state->top;
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}
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// returns stack->top - indx - 1
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static inline StkPtr cosmoV_getTop(CState *state, int indx) {
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return &state->top[-(indx + 1)];
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}
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// pops 1 value off the stack
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static inline StkPtr cosmoV_pop(CState *state) {
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return cosmoV_setTop(state, 1);
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}
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// pushes a cosmo_Number to the stack
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static inline void cosmoV_pushNumber(CState *state, cosmo_Number num) {
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cosmoV_pushValue(state, cosmoV_newNumber(num));
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