static void deleteToken (tokenInfo *const token)
{
vStringDelete (token->string);
vStringDelete (token->scope);
eFree (token);
}
void eval( Node *node )
{
int i, j;
Number n1, n2, n3, n4;
char *string1;
Symbol *s;
Node *n;
Array *a;
/* debugging */
#ifdef __DEBUG_TRACE__
SourceCode *sc;
#endif
/* init vars */
n1=0;
n2=0;
n3=0;
n4=0;
if (node == NULL) {
return;
}
/* test node */
eMemTest( "eval: node is corrupt", node );
eMemTest( "eval: node->left is corrupt", node->left );
eMemTest( "eval: node->right is corrupt", node->right );
/* tracing */
if (node->trace != -1) {
runLineId = node->trace;
#ifdef __DEBUG_TRACE__
sc = eFindSource( runLineId );
eConsole("%d: %s\n", sc->lineNum, sc->text );
#endif
/* sdlBasic_debugging */
if (debug==1){
screendebug(); ////////////////////////////////////
}
}
/* debugging */
#ifdef __DEBUG_TRACE__
eConsole( "Op:%s\n", opcodeName[node->op] );
#endif
switch( node->op ) {
//case NULL:
// break;
case OpAdd:
eval( node->left );
eval( node->right );
/* add or concat? */
if (getStackType( tos ) == DATA_STRING) {
basConcat();
} else {
n2 = popNumber();
n1 = popNumber();
pushNumber( n1 + n2 );
}
break;
case OpAnd:
/* short circuit */
eval( node->left );
if (!popNumber()) {
pushNumber( (Number)0 );
} else {
eval( node->right );
if (popNumber()) {
pushNumber( (Number)1 );
} else {
pushNumber( (Number)0 );
}
}
break;
case OpArgList:
eval( node->left );
eval( node->right );
break;
case OpArrayGet:
eval( node->left ); /* indices and index */
getArrayElement( node->value.symbol );
break;
case OpArrayPtr:
pushArray( node->value.symbol );
break;
case OpArraySet:
eval( node->right ); /* value to store */
eval( node->left ); /* indices and index */
setArrayElement( node->value.symbol );
break;
case OpAssign:
/* value to be assigned. note the *right* node is used */
eval( node->right );
/* variable to assign to */
setVar( node->value.symbol );
break;
case OpBuiltin:
case OpBuiltinCall:
/* for argcount */
n1 = tos;
/* mark start of created objects */
pushCreateStack( 0 );
/* the args */
eval( node->left );
/* builtin symbol */
s = node->value.symbol;
if (s == NULL) {
ePrintf( Runtime, "builtin pointer is null");
}
/* set args */
argCount = (int)(tos - n1);
/* call the c function */
(*s->builtin)();
/* destroy created objects */
clearCreateStack();
/* drop result? */
if (node->op == OpBuiltinCall) {
dropTos();
}
break;
case OpCaseSelect:
/* top level of a case statement */
/* value to compare */
eval( node->left );
/* resolve into real data */
switch (getStackType( tos )) {
case DATA_NUMBER:
pushNumber( popNumber() );
break;
case DATA_STRING:
pushString( popString() );
break;
default:
ePrintf( Runtime, "OpCaseSelect: can't resolve type %s",
datumName[getStackType( tos )] );
}
/* get first test */
if (node == NULL) {
/* no tests */
break;
} else {
node = node->right;
}
/* walk the chain of cases */
while (1) {
/* get a test/action pair */
n = node->left;
/* perform the tests */
eval( n->left );
/* true? */
if (popNumber()) {
/* perform action and leave loop */
eval( n->right );
break;
}
/* move to next test */
node = node->right;
if (node == NULL) {
break;
}
}
/* drop the test value from the stack */
dropTos();
break;
case OpCaseCmp:
case OpCaseRange:
case OpCaseElse:
/* perform chain of tests until true or end */
while (1) {
switch (node->op) {
case OpCaseCmp:
/* value to compare */
eval(node->left);
/* what type of test? */
switch (getStackType( tos-1 )) {
case DATA_NUMBER:
numberCompare( node->value.iValue, 0 );
break;
case DATA_STRING:
stringCompare( node->value.iValue, 0 );
break;
default:
ePrintf( Runtime, "OpCaseCmp: bad data type" );
}
break;
case OpCaseRange:
/* values to compare */
n = node->left;
eval( n->left );
eval( n->right );
/* what type of comparison? */
switch (getStackType( tos-2 )) {
case DATA_NUMBER:
numberRangeCompare();
break;
case DATA_STRING:
stringRangeCompare();
break;
default:
ePrintf( Runtime, "OpCaseRange: bad data type" );
break;
}
break;
case OpCaseElse:
/* put true on stack */
pushNumber( 1 );
break;
default:
ePrintf( Runtime, "opcode %s found in Case test chain",
opcodeName[node->op] );
}
/* was result true? */
if (stack[tos].value.number) {
/* leave true flag on stack and exit */
break;
}
/* move to next test */
node = node->right;
if (node == NULL) {
/* exit with false flag */
break;
}
/* drop test result flag */
dropTos();
}
break;
case OpClassMethod:
case OpClassMethodCall:
/* the args */
n1 = tos;
/* mark start of created objects */
pushCreateStack( 0 );
/* the args */
eval( node->right );
argCount = (int)(tos - n1);
me = 0;
runMethod( node->left->value.symbol->klass, node->value.string );
/* destroy created objects */
clearCreateStack();
/* drop result? */
if (node->op == OpClassMethodCall) {
dropTos();
}
break;
case OpClose:
if (node->left == NULL) {
fileCloseAll();
} else {
eval( node->left );
i = (int)popNumber();
fileClose( i );
}
break;
case OpCmp:
eval( node->left );
eval( node->right );
switch(getStackType(tos)) {
case DATA_NUMBER:
numberCompare( node->value.iValue, 1 );
break;
case DATA_STRING:
stringCompare( node->value.iValue, 1 );
break;
default:
ePrintf( Runtime, "opCmp: can't handle datatype" );
}
break;
case OpComma:
/* optimized for linked lists */
while (1) {
/* exit flag set? */
if (exitForFlag != 0 ||
exitRoutineFlag != 0 ||
exitDoFlag != 0 ||
exitWhileFlag != 0 ||
continueFlag ) {
break;
}
if (node->left != NULL ) {
eval( node->left );
}
/* end of list? */
if (node->right == NULL ) {
break;
/* linked list? */
} else if (node->right->op == OpComma) {
node = node->right;
/* not a list */
} else {
eval( node->right );
break;
}
}
break;
case OpConcat:
eval( node->left );
eval( node->right );
basConcat();
break;
case OpConstGet:
s = node->value.symbol;
i = s->stackPos;
/* this better not be indirected! */
switch (stack[i].datatype) {
case DATA_STRING:
pushString( stack[i].value.string );
break;
case DATA_NUMBER:
pushNumber( stack[i].value.number );
break;
default:
ePrintf( Runtime, "Can't fetch Const type %s",
datumName[stack[i].datatype] );
break;
}
break;
case OpConstSet:
s = node->value.symbol;
eval( node->left );
switch (stack[tos].datatype) {
case DATA_STRING:
stack[s->stackPos].datatype = DATA_STRING;
stack[s->stackPos].value.string = stack[tos].value.string;
stack[tos].datatype = DATA_NUMBER;
tos--;
break;
case DATA_NUMBER:
stack[s->stackPos].datatype = DATA_NUMBER;
stack[s->stackPos].value.number = stack[tos].value.number;
tos--;
break;
default:
ePrintf( Runtime, "Can't set Const to %s", datumName[stack[tos].datatype] );
break;
}
break;
case OpDelete:
eval( node->left );
runDestructor( (int)popNumber(), OpDelete );
break;
case OpDestroy:
eval( node->left );
runDestructor( (int)popNumber(), OpDestroy );
break;
case OpContinue:
continueFlag = 1;
break;
case OpDiv:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
if (n2 == 0.0) {
ePrintf( Runtime, "Division by zero" );
}
pushNumber( n1 / n2 );
break;
case OpDo:
while (1) {
/* test */
eval( node->left );
/*if (!popNumber()){
break;
}*/
/* code */
eval( node->right );
//printf("exitDoFlag:%d\n",exitDoFlag);
if (exitDoFlag != 0) {
exitDoFlag = 0;
break;
}
else if (continueFlag) {
continueFlag = 0;
}
}
break;
case OpEnd:
eShutdown(0);
break;
case OpErase:
if (node->left == NULL) {
/* erase entire array */
eraseArray( node->value.symbol );
} else {
/* evaluate the indexes */
eval( node->left );
/* erase single element from array */
eraseArrayElement( node->value.symbol );
}
break;
case OpExitDo:
exitDoFlag = 1;
break;
case OpExitFor:
exitForFlag = 1;
break;
case OpExitRoutine:
currentScope=oldScope[oldScopeP--];
exitRoutineFlag = 1;
break;
case OpExitWhile:
exitWhileFlag = 1;
break;
case OpFloat:
pushNumber( node->value.fValue );
break;
case OpFor:
s = node->value.symbol;
eval( node->left );
n2 = popNumber();
n1 = popNumber();
/* initial value */
pushNumber( n3 );
setVar( s );
for( n3=n1; n3 <= n2; n3++ ) {
/* set loop variable */
pushNumber( n3 );
setVar( s );
/* run code */
eval( node->right );
/* special exit condition? */
if (exitForFlag) {
exitForFlag = 0;
break;
} else if (continueFlag) {
continueFlag = 0;
}
/* get loop value (in case it changed) */
getVar( s );
n3 = popNumber();
}
break;
case OpForEach:
/* variable to assign */
s = node->value.symbol;
/* array to read from */
a = getArray( node->left->value.symbol );
/* iterate through keys */
i = 0;
/* put key on stack, or exit */
while (getDynamicKey( a, i )) {
/* assign to variable */
setVar( s );
/* run block */
eval( node->right );
/* next */
i += 1;
}
break;
case OpForStep:
s = node->value.symbol;
eval( node->left );
n3 = popNumber(); /* step */
n2 = popNumber(); /* end */
n1 = popNumber(); /* start */
/* which direction? */
if (n3 > 0) {
n2 += ALLOWABLE_ERROR;
for( n4=n1; n2 >= n4; n4 += n3 ) {
/* set loop variable */
pushNumber( n4 );
setVar( s );
/* run code */
eval( node->right );
/* special exit condition? */
if (exitForFlag) {
exitForFlag = 0;
break;
} else if (continueFlag) {
continueFlag = 0;
}
/* get loop value (in case it changed) */
getVar( s );
n4 = popNumber();
}
} else {
n2 -= ALLOWABLE_ERROR;
for( n4=n1; n2 <= n4; n4 += n3 ) {
/* set loop variable */
pushNumber( n4 );
setVar( s );
/* run code */
eval( node->right );
/* special exit condition? */
if (exitForFlag) {
exitForFlag = 0;
break;
} else if (continueFlag) {
continueFlag = 0;
}
/* get loop value (in case it changed) */
getVar( s );
n4 = popNumber();
}
}
break;
case OpFunction:
case OpFunctionCall:
callFunction( node );
break;
case OpInitArray:
if (node->left == NULL) {
createDynamicArray( node->value.symbol );
} else {
eval( node->left );
createStaticArray( node->value.symbol );
}
break;
case OpInput:
if (node->value.iValue == 1) {
eval( node->left );
i = (int)popNumber();
string1 = fileLineInput( i );
pushString( string1 );
} else {
/* command line */
ePrintf( Runtime, "Input statement is not currently supported" );
}
break;
case OpInt:
pushNumber( node->value.iValue );
break;
case OpMethod:
case OpMethodCall:
/* the index */
eval( node->left );
n1 = popNumber();
/* method name */
string1 = node->value.string;
/* mark start of created objects */
pushCreateStack( 0 );
/* args */
n2 = tos;
eval( node->right );
argCount = (int)(tos - n2);
/* resolve and run method */
resolveMethod( (int)n1, string1 );
/* drop result? */
if (node->op == OpMethodCall) {
dropTos();
}
/* destroy created objects */
clearCreateStack();
break;
case OpMod:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
//pushNumber( (long)n1 % (long)n2 );
pushNumber( fmod(n1,n2) );
break;
case OpMul:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
pushNumber( n1 * n2 );
break;
case OpOpen:
/* file name */
eval( node->left );
string1 = popString();
/* mode */
i = node->value.iValue;
/* file number */
eval( node->right );
n1 = popNumber();
fileOpen( string1, i, (int)n1 );
free( string1 );
break;
case OpOr:
/* short circuit */
eval( node->left );
if (popNumber()) {
pushNumber( (Number)1 );
} else {
eval( node->right );
if (popNumber()) {
pushNumber( (Number)1 );
} else {
pushNumber( (Number)0 );
}
}
break;
case OpOrBits:
eval( node->left );
eval( node->right);
i = popNumber();
j = popNumber();
pushNumber( i | j );
break;
case OpIDiv:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
/* check for division by zero */
if (n2 == 0.0) {
ePrintf( Runtime, "Division by zero" );
}
pushNumber( floor(n1 / n2) );
break;
case OpIf:
n = node->left;
/* test */
eval( n->left );
n1 = popNumber();
if (n1 != 0) {
/* true portion */
eval( n->right );
} else {
/* false portion */
eval( node->right );
}
break;
case OpIfTrue:
ePrintf( Runtime, "OpIfTrue: internal error" );
break;
case OpIn:
/* evaluate key */
eval( node->left );
/* look for it in array */
pushNumber( inArray( node->value.symbol ) );
break;
case OpInv:
ePrintf( Runtime, "Inv is not implemented yet" );
break;
case OpNegate:
eval( node->left );
n1 = popNumber();
pushNumber( -n1 );
break;
case OpNew:
case OpNewTmp:
/* mark start of created objects */
pushCreateStack( 0 );
/* the args */
n1 = tos;
eval( node->left );
argCount = (int)(tos - n1);
runMethod( node->value.symbol->klass, "new" );
/* destroy created objects *before* adding new object to stack */
clearCreateStack();
/* add new object to create stack? */
if (node->op == OpNewTmp) {
/* track on stack */
copyStackItem( tos );
pushCreateStack( (int)popNumber() );
}
break;
case OpNoOp:
break;
case OpNot:
eval( node->left );
n1 = popNumber();
pushNumber( !n1 );
break;
case OpPower:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
pushNumber( pow( n1, n2 ) );
break;
case OpPrint:
if (node->left == NULL) {
i = 0;
} else {
eval( node->left );
i = (int)popNumber();
}
node = node->right;
/* empty print statement */
if (node == NULL) {
if (i==0) {
eConsole("\n");
} else {
filePrintString( i, "\n" );
}
}
/* process nodes */
while(node != NULL) {
/* data value */
if (node->left != NULL) {
eval( node->left );
string1 = popString();
if (i==0) {
eConsole("%s", string1 );
} else {
filePrintString( i, string1 );
}
eFree( string1 );
}
/* field delimiter */
switch (node->value.iValue) {
case PRINT_TAB:
if (i==0) {
eConsole("\t");
} else {
filePrintString( i, "\t" );
}
break;
case PRINT_NEWLINE:
if (i==0) {
eConsole("\n");
} else {
filePrintString( i, "\n" );
}
break;
default:
/* no action */
break;
}
/* link */
node = node->right;
}
break;
case OpReturnValue:
eval( node->left );
setReturn();
exitRoutineFlag = 1;
break;
case OpReturnSetValue:
eval( node->left );
setReturn();
break;
case OpShl:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
pushNumber( (long)n1 << (long)n2 );
break;
case OpShr:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
pushNumber( (long)n1 >> (long)n2 );
break;
case OpString:
pushStringCopy( node->value.string );
break;
case OpSub:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
pushNumber( n1 - n2 );
break;
case OpUndefined:
ePrintf( Runtime, "Opcode is undefined" );
break;
case OpVar:
/* check type */
getVar( node->value.symbol );
if (getStackType(tos) == DATA_UNDEFINED) {
ePrintf( Runtime, "the value of %s is undefined",
node->value.symbol->name );
}
break;
case OpWhile:
while (1) {
/* test */
eval( node->left );
if (!popNumber()){
break;
}
/* code */
eval( node->right );
if (exitWhileFlag != 0) {
exitWhileFlag = 0;
break;
} else if (continueFlag) {
continueFlag = 0;
}
}
break;
case OpXor:
eval( node->left );
eval( node->right );
n2 = popNumber();
n1 = popNumber();
pushNumber( (long)n1 ^ (long)n2 );
break;
default:
ePrintf( Runtime, "Unknown Opcode: %d", node->op );
}
}
extern void freeRoutineResources (void)
{
if (CurrentDirectory != NULL)
eFree (CurrentDirectory);
}
extern void freeTagFileResources (void)
{
if (TagFile.directory != NULL)
eFree (TagFile.directory);
vStringDelete (TagFile.vLine);
}
extern void circularRefCheckerDestroy (struct circularRefChecker * checker)
{
hashTableDelete (checker->visitTable);
checker->visitTable = NULL;
eFree (checker);
}