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uexec.c
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/*************************************************************************
* uexec.c
* Executing a uCode program once it has been loaded.
*************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "umach.h"
#include "uexec.h"
#include "uconfig.h"
/*************************************************************************
* Local routine prototypes for opcode execution.
*************************************************************************/
static void xRD (uINSTRUCTION *instr);
static void xRDF (uINSTRUCTION *instr);
static void xRDS (uINSTRUCTION *instr);
static void xWRT (uINSTRUCTION *instr);
static void xWRTS (uINSTRUCTION *instr);
static void xWRTLN (uINSTRUCTION *instr);
static void xWRTLNS(uINSTRUCTION *instr);
static void xMOV (uINSTRUCTION *instr);
static void xNEG (uINSTRUCTION *instr);
static void xADD (uINSTRUCTION *instr);
static void xSUB (uINSTRUCTION *instr);
static void xMUL (uINSTRUCTION *instr);
static void xDIV (uINSTRUCTION *instr);
static void xMOD (uINSTRUCTION *instr);
static void xNEGF (uINSTRUCTION *instr);
static void xADDF (uINSTRUCTION *instr);
static void xSUBF (uINSTRUCTION *instr);
static void xMULF (uINSTRUCTION *instr);
static void xDIVF (uINSTRUCTION *instr);
static void xCASTI(uINSTRUCTION *instr);
static void xCASTF(uINSTRUCTION *instr);
static void xPUSH(uINSTRUCTION *instr);
static void xPOP (uINSTRUCTION *instr);
static void xNEGS(uINSTRUCTION *instr);
static void xADDS(uINSTRUCTION *instr);
static void xSUBS(uINSTRUCTION *instr);
static void xMULS(uINSTRUCTION *instr);
static void xDIVS(uINSTRUCTION *instr);
static void xMODS(uINSTRUCTION *instr);
static void xNEGSF(uINSTRUCTION *instr);
static void xADDSF(uINSTRUCTION *instr);
static void xSUBSF(uINSTRUCTION *instr);
static void xMULSF(uINSTRUCTION *instr);
static void xDIVSF(uINSTRUCTION *instr);
static void xCASTSI(uINSTRUCTION *instr);
static void xCASTSF(uINSTRUCTION *instr);
static void xANDS(uINSTRUCTION *instr);
static void xORS(uINSTRUCTION *instr);
static void xNOTS(uINSTRUCTION *instr);
static void xCMPEQS(uINSTRUCTION *instr);
static void xCMPGES(uINSTRUCTION *instr);
static void xCMPGTS(uINSTRUCTION *instr);
static void xCMPLES(uINSTRUCTION *instr);
static void xCMPLTS(uINSTRUCTION *instr);
static void xCMPNES(uINSTRUCTION *instr);
static void xCMPEQSF(uINSTRUCTION *instr);
static void xCMPGESF(uINSTRUCTION *instr);
static void xCMPGTSF(uINSTRUCTION *instr);
static void xCMPLESF(uINSTRUCTION *instr);
static void xCMPLTSF(uINSTRUCTION *instr);
static void xCMPNESF(uINSTRUCTION *instr);
static void xBRTS (uINSTRUCTION *instr, int label[], int *PC);
static void xBRFS (uINSTRUCTION *instr, int label[], int *PC);
static void xBR (uINSTRUCTION *instr, int label[], int *PC);
static void xBEQ (uINSTRUCTION *instr, int label[], int *PC);
static void xBGE (uINSTRUCTION *instr, int label[], int *PC);
static void xBGT (uINSTRUCTION *instr, int label[], int *PC);
static void xBLE (uINSTRUCTION *instr, int label[], int *PC);
static void xBLT (uINSTRUCTION *instr, int label[], int *PC);
static void xBNE (uINSTRUCTION *instr, int label[], int *PC);
static void xBEQF (uINSTRUCTION *instr, int label[], int *PC);
static void xBGEF (uINSTRUCTION *instr, int label[], int *PC);
static void xBGTF (uINSTRUCTION *instr, int label[], int *PC);
static void xBLEF (uINSTRUCTION *instr, int label[], int *PC);
static void xBLTF (uINSTRUCTION *instr, int label[], int *PC);
static void xBNEF (uINSTRUCTION *instr, int label[], int *PC);
static void xCALL(uINSTRUCTION *instr, int label[], int *PC);
static void xRET (uINSTRUCTION *instr, int *PC);
static void xPRTS(void);
static void xPRTR(void);
/*************************************************************************
* Local routine prototypes for operand access.
*************************************************************************/
static void operandStore(uOPERAND op, uVALUE val);
static void operandFetch(uOPERAND op, uVALUE *val);
static void stackPush(uVALUE val);
static void stackPop (uVALUE *val);
/*************************************************************************
* Local routine prototypes for execution error reporting.
*************************************************************************/
static void execError(char *src, int line, char *mesg);
/*************************************************************************
* "Global" execution variables...
*************************************************************************/
char execMessage[255] = "";
char *execText;
int execLine;
/*************************************************************************
* uExecute
* uMachine fetch & execute cycle.
*************************************************************************/
int uExecute(uINSTRUCTION code[], int label[])
{
uINSTRUCTION *currInstr;
int PC = 0;
/* Fetch & Execute cycle */
while (code[PC].Opcode != oHLT) {
currInstr = &code[PC];
PC++;
execText = currInstr->Text;
execLine = currInstr->Line;
switch (currInstr->Opcode) {
/* CORRUPT PC - RAISE EXECUTION ERROR */
case oEND: {
fprintf(stderr, ">>>ERROR - DURING EXECUTION:\n");
fprintf(stderr, " EXECUTING INVALID CODE MEMORY\n");
exit(1);
}
/* HALT instruction */
case oHLT: { break; }
/* I/O instructions */
case oRD : { xRD (currInstr); break; }
case oRDF : { xRDF (currInstr); break; }
case oRDS : { xRDS (currInstr); break; }
case oWRT : { xWRT (currInstr); break; }
case oWRTS : { xWRTS (currInstr); break; }
case oWRTLN : { xWRTLN (currInstr); break; }
case oWRTLNS: { xWRTLNS(currInstr); break; }
/* Mathematical instructions */
/* Integer */
case oMOV : { xMOV (currInstr); break; }
case oNEG : { xNEG (currInstr); break; }
case oADD : { xADD (currInstr); break; }
case oSUB : { xSUB (currInstr); break; }
case oMUL : { xMUL (currInstr); break; }
case oDIV : { xDIV (currInstr); break; }
case oMOD : { xMOD (currInstr); break; }
/* Float */
case oNEGF : { xNEGF (currInstr); break; }
case oADDF : { xADDF (currInstr); break; }
case oSUBF : { xSUBF (currInstr); break; }
case oMULF : { xMULF (currInstr); break; }
case oDIVF : { xDIVF (currInstr); break; }
/* Stack instructions */
case oPUSH: { xPUSH(currInstr); break; }
case oPOP : { xPOP (currInstr); break; }
/* Stack mathematical instruction */
/* Integer */
case oNEGS: { xNEGS(currInstr); break; }
case oADDS: { xADDS(currInstr); break; }
case oSUBS: { xSUBS(currInstr); break; }
case oMULS: { xMULS(currInstr); break; }
case oDIVS: { xDIVS(currInstr); break; }
case oMODS: { xMODS(currInstr); break; }
/* Float */
case oNEGSF: { xNEGSF(currInstr); break; }
case oADDSF: { xADDSF(currInstr); break; }
case oSUBSF: { xSUBSF(currInstr); break; }
case oMULSF: { xMULSF(currInstr); break; }
case oDIVSF: { xDIVSF(currInstr); break; }
/* Stack Casting instructions */
case oCASTSI: { xCASTSI(currInstr); break; }
case oCASTSF: { xCASTSF(currInstr); break; }
/* Stack logical instructions */
case oANDS: { xANDS(currInstr); break; }
case oORS: { xORS(currInstr); break; }
case oNOTS: { xNOTS(currInstr); break; }
/* Compare instructions */
/* Integer */
case oCMPEQS: { xCMPEQS(currInstr); break; }
case oCMPGES: { xCMPGES(currInstr); break; }
case oCMPGTS: { xCMPGTS(currInstr); break; }
case oCMPLES: { xCMPLES(currInstr); break; }
case oCMPLTS: { xCMPLTS(currInstr); break; }
case oCMPNES: { xCMPNES(currInstr); break; }
/* Float */
case oCMPEQSF: { xCMPEQSF(currInstr); break; }
case oCMPGESF: { xCMPGESF(currInstr); break; }
case oCMPGTSF: { xCMPGTSF(currInstr); break; }
case oCMPLESF: { xCMPLESF(currInstr); break; }
case oCMPLTSF: { xCMPLTSF(currInstr); break; }
case oCMPNESF: { xCMPNESF(currInstr); break; }
/* Stack branching instructions */
case oBRTS : { xBRTS (currInstr, label, &PC); break; };
case oBRFS : { xBRFS (currInstr, label, &PC); break; };
/* Label instruction - no action is performed */
case oLAB: { break; }
/* Braching insructions */
/* Integer */
case oBR : { xBR (currInstr, label, &PC); break; }
case oBEQ : { xBEQ(currInstr, label, &PC); break; }
case oBGE : { xBGE(currInstr, label, &PC); break; }
case oBGT : { xBGT(currInstr, label, &PC); break; }
case oBLE : { xBLE(currInstr, label, &PC); break; }
case oBLT : { xBLT(currInstr, label, &PC); break; }
case oBNE : { xBNE(currInstr, label, &PC); break; }
/* Float */
case oBEQF : { xBEQF(currInstr, label, &PC); break; }
case oBGEF : { xBGEF(currInstr, label, &PC); break; }
case oBGTF : { xBGTF(currInstr, label, &PC); break; }
case oBLEF : { xBLEF(currInstr, label, &PC); break; }
case oBLTF : { xBLTF(currInstr, label, &PC); break; }
case oBNEF : { xBNEF(currInstr, label, &PC); break; }
/* Subroutine instructions */
case oCALL: { xCALL(currInstr, label, &PC); break; }
case oRET : { xRET (currInstr, &PC); break; }
/* Debug instructions */
case oPRTS: { xPRTS(); break; }
case oPRTR: { xPRTR(); break; }
/* Unknown instruction */
default: {
perror( ">>> INTERNAL ERROR IN uEXECUTE <<<");
exit(1);
}
}
/* Check for corrupt PC */
if ((PC < 0) || (PC >= codeSize)) {
fprintf(stderr, ">>>ERROR - DURING EXECUTION:\n");
fprintf(stderr, " EXECUTING OUTSIDE CODE MEMORY\n");
exit(1);
}
}
return 1;
}
/*************************************************************************
* I/O instructions (rd, wrt & wrts)
*************************************************************************/
static void xRD(uINSTRUCTION *instr)
{
int input;
int result;
uVALUE val;
if(READ_ANNOTATION)
fprintf(stdout, "? ");
result = fscanf(stdin , "%d", &input);
if(result < 1){
fprintf(stderr, ">>>ERROR - DURING EXECUTION:\n");
fprintf(stderr, " INVALID READ ENTRY: EXPECTED AN INTEGER.\n");
exit(1);
}
val.ElementType = INTEGER;
val.Element.intValue = input;
operandStore(instr->Operand[0], val);
}
static void xRDF(uINSTRUCTION *instr)
{
float input;
int result;
uVALUE val;
if(READ_ANNOTATION)
fprintf(stdout, "? ");
result = fscanf(stdin , "%f", &input);
if(result < 1){
fprintf(stderr, ">>>ERROR - DURING EXECUTION:\n");
fprintf(stderr, " INVALID READ ENTRY: EXPECTED A FLOAT OR FIXED.\n");
exit(1);
}
val.ElementType = FLOAT;
val.Element.floatValue = input;
operandStore(instr->Operand[0], val);
}
static void xRDS(uINSTRUCTION *instr)
{
uVALUE val;
int result;
char* input;
if(READ_ANNOTATION)
fprintf(stdout, "? ");
//Read until newline or 1023 characters(MAX_STRING_LENGTH=100 in uvalues.h)
result = fscanf(stdin , "%1023[^\n]", val.Element.stringValue);
//if(fgets(val.Element.stringValue, MAX_STRING_LENGTH, stdin) == NULL){
if(result < 1){
fprintf(stderr, ">>>ERROR - DURING EXECUTION:\n");
fprintf(stderr, " INVALID READ ENTRY: EXPECTED A STRING WITH A LENGTH OF AT LEAST 1.\n");
exit(1);
}
val.ElementType = STRING;
operandStore(instr->Operand[0], val);
}
static void xWRT(uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
printValue(stdout, val);
}
static void xWRTS(uINSTRUCTION *instr)
{
uVALUE val;
stackPop(&val);
printValue(stdout, val);
}
static void xWRTLN(uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
printValueLine(stdout, val);
}
static void xWRTLNS(uINSTRUCTION *instr)
{
uVALUE val;
stackPop(&val);
printValueLine(stdout, val);
}
/*************************************************************************
* Memory instructions (mov, neg, add, sub, mul & div)
*************************************************************************/
static void xMOV(uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
operandStore(instr->Operand[1], val);
}
static void xNEG(uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
val = negateValue(val, INTEGER);
if(val.ElementType == EMPTY)
{
sprintf(execMessage, "Negation integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[1], val);
}
static void xADD(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = addValues(val1, val2, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Addition integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1);
}
static void xSUB(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = subValues(val1, val2, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Subtraction integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1); //val1 - val2
}
static void xMUL(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = mulValues(val1, val2, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Muliplication integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1);
}
static void xDIV(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = divValues(val1, val2, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Division integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == UNDEFINED)
{
sprintf(execMessage, "DIVSION BY ZERO.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1); //val1 / val2
}
static void xMOD(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = modValues(val1, val2);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Modulo operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == UNDEFINED)
{
sprintf(execMessage, "Modulo operation: DIVISION BY ZERO.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1);
}
static void xNEGF (uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
val = negateValue(val, FLOAT);
if(val.ElementType == EMPTY)
{
sprintf(execMessage, "Negation float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[1], val);
}
static void xADDF (uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = addValues(val1, val2, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Addition float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1);
}
static void xSUBF (uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = subValues(val1, val2, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Subtraction float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1); //val1 - val2
}
static void xMULF (uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = mulValues(val1, val2, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Muliplication float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1);
}
static void xDIVF (uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
operandFetch(instr->Operand[0], &val1);
operandFetch(instr->Operand[1], &val2);
val1 = divValues(val1, val2, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Division float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == UNDEFINED)
{
sprintf(execMessage, "DIVSION BY ZERO.");
execError(execText, execLine, execMessage);
}
operandStore(instr->Operand[2], val1); //val1 / val2
}
/*********************************************************************
* Memory cast instructions(casti & castj)
* Cast from float to int and vice versa
********************************************************************/
static void xCASTI (uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
if(val.ElementType == EMPTY)
{
sprintf(execMessage, "Trying to cast an empty value.");
execError(execText, execLine, execMessage);
}
else if(val.ElementType == FLOAT)
{
val.ElementType = INTEGER;
val.Element.intValue = (int)val.Element.floatValue;
}
else if(val.ElementType == INTEGER)
{
//Do nothing, already integer
}
operandStore(instr->Operand[1], val);
}
static void xCASTF (uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
if(val.ElementType == EMPTY)
{
sprintf(execMessage, "Trying to cast an empty value.");
execError(execText, execLine, execMessage);
}
else if(val.ElementType == INTEGER)
{
val.ElementType = FLOAT;
val.Element.intValue = (float)val.Element.intValue;
}
else if(val.ElementType == FLOAT)
{
//Do nothing, already integer
}
operandStore(instr->Operand[1], val);
}
/*************************************************************************
* Stack instructions (push, pop, adds, subs, muls, divs, & mods)
*************************************************************************/
static void xPUSH(uINSTRUCTION *instr)
{
uVALUE val;
operandFetch(instr->Operand[0], &val);
stackPush(val);
}
static void xPOP(uINSTRUCTION *instr)
{
uVALUE val;
stackPop(&val);
operandStore(instr->Operand[0], val);
}
static void xNEGS(uINSTRUCTION *instr)
{
uVALUE val;
stackPop(&val);
val = negateValue(val, INTEGER);
if(val.ElementType == EMPTY)
{
sprintf(execMessage, "Negation integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val);
}
static void xADDS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = addValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Addition integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xSUBS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = subValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Subtraction integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1); //val2 - val1
}
static void xMULS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = mulValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Multiplication integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xDIVS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = divValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Division integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == UNDEFINED)
{
sprintf(execMessage, "DIVSION BY ZERO.");
execError(execText, execLine, execMessage);
}
stackPush(val1); //val2 / val1
}
static void xMODS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = modValues(val2, val1);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Modulo operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == UNDEFINED)
{
sprintf(execMessage, "Modulo operation: DIVISION BY ZERO.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xNEGSF(uINSTRUCTION *instr)
{
uVALUE val;
stackPop(&val);
val = negateValue(val, FLOAT);
if(val.ElementType == EMPTY)
{
sprintf(execMessage, "Negation float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val);
}
static void xADDSF(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = addValues(val2, val1, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Addition float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xSUBSF(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = subValues(val2, val1, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Subtraction float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1); //val2 - val1
}
static void xMULSF(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = mulValues(val2, val1, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Multiplication float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xDIVSF(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = divValues(val2, val1, FLOAT);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Division float operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == UNDEFINED)
{
sprintf(execMessage, "DIVSION BY ZERO.");
execError(execText, execLine, execMessage);
}
stackPush(val1); //val2 / val1
}
/*************************************************************************
* Stack casting instructions (castsi, castsf)
*************************************************************************/
static void xCASTSI(uINSTRUCTION *instr)
{
uVALUE val1;
stackPop(&val1);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Trying to cast an empty value.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == FLOAT)
{
val1.ElementType = INTEGER;
val1.Element.intValue = (int)val1.Element.floatValue;
}
else if(val1.ElementType == INTEGER)
{
//Do nothing, already integer
}
else if(val1.ElementType == STRING)
{
sprintf(execMessage, "Trying to cast a string to a float.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xCASTSF(uINSTRUCTION *instr)
{
uVALUE val1;
stackPop(&val1);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Trying to cast an empty value.");
execError(execText, execLine, execMessage);
}
else if(val1.ElementType == INTEGER)
{
val1.ElementType = FLOAT;
val1.Element.floatValue = (float)val1.Element.intValue;
}
else if(val1.ElementType == FLOAT)
{
//Do nothing, already float
}
else if(val1.ElementType == STRING)
{
sprintf(execMessage, "Trying to cast a string to an integer.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
/************************************************************************
* Stack logical instructions(ands, ors, & nots)
* 0 is false, 1 is true
*************************************************************************/
static void xANDS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = andValues(val2, val1);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Logical AND operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xORS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = orValues(val2, val1);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Logical OR operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xNOTS(uINSTRUCTION *instr)
{
uVALUE val1;
stackPop(&val1);
val1 = notValue(val1);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Logical NOT operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
/************************************************************************
* Compare instructions(cmpeqs, cmpges, cmpgts, cmples, cmplts, & cmpnes)
* 0 is false, 1 is true
*************************************************************************/
static void xCMPEQS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = eqValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Relational EQUALS integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xCMPGES(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = geValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Relational GREATER THAH/EQUALS TO integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xCMPGTS(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = gtValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Relational GREATER THAN integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);
}
stackPush(val1);
}
static void xCMPLES(uINSTRUCTION *instr)
{
uVALUE val1;
uVALUE val2;
stackPop(&val1);
stackPop(&val2);
val1 = leValues(val2, val1, INTEGER);
if(val1.ElementType == EMPTY)
{
sprintf(execMessage, "Relational LESS THAN/EQUALS TO integer operation on invalid TYPE.");
execError(execText, execLine, execMessage);