From d3da6ba716d94ec684186a89a52fb90636db89ee Mon Sep 17 00:00:00 2001 From: Rainer Gerhards Date: Fri, 22 Feb 2008 09:51:34 +0000 Subject: completed initial vmstk implementation --- vmstk.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'vmstk.c') diff --git a/vmstk.c b/vmstk.c index 1db7b8fa..6944b6f9 100644 --- a/vmstk.c +++ b/vmstk.c @@ -66,7 +66,9 @@ CODESTARTobjDebugPrint(vmstk) ENDobjDebugPrint(vmstk) -/* push a value on the stack +/* push a value on the stack. The provided pVar is now owned + * by the stack. If the user intends to continue use it, it + * must be duplicated. */ static rsRetVal push(vmstk_t *pThis, var_t *pVar) @@ -76,11 +78,18 @@ push(vmstk_t *pThis, var_t *pVar) ISOBJ_TYPE_assert(pThis, vmstk); ISOBJ_TYPE_assert(pVar, var); + if(pThis->iStkPtr >= VMSTK_SIZE) + ABORT_FINALIZE(RS_RET_OUT_OF_STACKSPACE); + + pThis->vStk[pThis->iStkPtr++] = pVar; + +finalize_it: RETiRet; } /* pop a value from the stack + * The user is responsible for destructing the ppVar returned. */ static rsRetVal pop(vmstk_t *pThis, var_t **ppVar) @@ -90,6 +99,12 @@ pop(vmstk_t *pThis, var_t **ppVar) ISOBJ_TYPE_assert(pThis, vmstk); assert(ppVar != NULL); + if(pThis->iStkPtr == 0) + ABORT_FINALIZE(RS_RET_STACK_EMPTY); + + *ppVar = pThis->vStk[pThis->iStkPtr--]; + +finalize_it: RETiRet; } -- cgit