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stackVis.c
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stackVis.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define CHAR_BYTES 1
#define SHORT_BYTES 2
#define INT_BYTES 4
#define LONG_BYTES 4
#define FLOAT_BYTES 4
#define DOUBLE_BYTES 8
#define BUF_LEN 40
#define PRINTBUF 25
#define PRINTBUF_WORD 22
#define STACKSIZE 50
#define CHAR "char"
#define SHORT "short"
#define INT "int"
#define LONG "long"
#define FLOAT "float"
#define DOUBLE "double"
#define WORD "| %c |"
#define HALF_HALF "| %c | %c |"
#define HALF_BYTE_BYTE "| %c | %c | %c |"
#define BYTE_HALF_BYTE "| %c | %c | %c |"
#define BYTE_BYTE_HALF "| %c | %c | %c |"
#define FOUR_BYTES "| %c | %c | %c | %c |"
char * generateStackFrame (char stackVals[], long word) {
//printf ("word: %ld", word);
char * buffer;
buffer = malloc(sizeof(char)*BUF_LEN);
int index = 0;
// 8 bytes
if (word) {
snprintf (buffer, PRINTBUF_WORD, WORD, stackVals[0]);
// 4 bytes + padding
} else {
for (index = 0; index < 4; index++) {
if (stackVals[index] == '\0')
stackVals[index] = 'X';
}
if (stackVals[3] == stackVals[2] && stackVals[3] != 'X') {
if (stackVals[1] == stackVals[0] && stackVals[1] != 'X') {
snprintf (buffer, PRINTBUF, HALF_HALF, stackVals[3], stackVals[1]);
} else {
snprintf (buffer, PRINTBUF, HALF_BYTE_BYTE, stackVals[3],
stackVals[1], stackVals[0]);
}
} else if (stackVals[1] == stackVals[2] && stackVals[1] != 'X') {
snprintf (buffer, PRINTBUF, BYTE_HALF_BYTE, stackVals[3],
stackVals[2], stackVals[0]);
} else if (stackVals[1] == stackVals[0] && stackVals[1] != 'X') {
if (stackVals[3] == stackVals[2] && stackVals[3] != 'X') {
snprintf (buffer, PRINTBUF, HALF_HALF,
stackVals[3], stackVals[1]);
} else {
snprintf (buffer, PRINTBUF, BYTE_BYTE_HALF, stackVals[3],
stackVals[2], stackVals[0]);
}
} else {
snprintf (buffer, PRINTBUF, FOUR_BYTES,
stackVals[3], stackVals[2], stackVals[1], stackVals[0]);
}
}
return buffer;
}
int main (int argc, char * argv[]) {
int availableBytes = 4;
int stackCount = 0;
int stackIndex = 0;
int numVars = 0;
int index = 0;
long filled = 0;
long word = 0;
char line[BUF_LEN];
char * inputString;
char * endPtr;
char * finalStack[STACKSIZE] = {""};
char stackVals[4] = {'\0'};
char varName;
printf ("Number of variables to initialize : ");
scanf ("%d\n", &numVars);
for (index = 0; index < numVars; index++) {
filled = 0;
inputString = fgets (line, BUF_LEN, stdin);
if (inputString == NULL) {
// error; no input
}
// extract variable name
endPtr = strchr (inputString, '\n');
endPtr--;
varName = endPtr[0];
// check for CHAR
if (strstr (inputString, CHAR)) {
if (availableBytes == 4){
stackVals[0] = varName;
availableBytes = 3;
filled = 1;
} else if (availableBytes == 3) {
stackVals[1] = varName;
availableBytes = 2;
filled = 1;
} else if (availableBytes == 2) {
stackVals[2] = varName;
availableBytes = 1;
filled = 1;
} else if (availableBytes == 1) {
stackVals[3] = varName;
availableBytes = 0;
filled = 1;
}
// check for SHORT
} else if (strstr (inputString, SHORT)) {
if (availableBytes == 4) {
stackVals[0] = varName;
stackVals[1] = varName;
availableBytes = 2;
filled = 1;
} else if (availableBytes == 3) {
stackVals[2] = varName;
stackVals[3] = varName;
availableBytes = 0;
filled = 1;
} else if (availableBytes == 2) {
stackVals[2] = varName;
stackVals[3] = varName;
availableBytes = 0;
filled = 1;
} else if (availableBytes == 1) {
// save previous stack frame
finalStack[stackCount++] = generateStackFrame (stackVals, word);
// prep frame for current var
stackVals[0] = varName;
stackVals[1] = varName;
stackVals[2] = '\0';
stackVals[3] = '\0';
availableBytes = 2;
filled = 1;
}
// check for INT, LONG, or FLOAT
} else if (strstr (inputString, INT) ||
strstr (inputString, LONG) ||
strstr (inputString, FLOAT)) {
if (availableBytes <= 3) {
// save previous stack frame
finalStack[stackCount++] = generateStackFrame (stackVals, word);
}
stackVals[0] = varName;
stackVals[1] = varName;
stackVals[2] = varName;
stackVals[3] = varName;
word = 1;
filled = 1;
availableBytes = 0;
// check for DOUBLE
} else if (strstr (inputString, DOUBLE)) {
if (availableBytes <= 3) {
// save previous stack frame
finalStack[stackCount++] = generateStackFrame (stackVals, word);
}
word = 1;
stackVals[0] = varName;
stackVals[1] = varName;
stackVals[2] = varName;
stackVals[3] = varName;
finalStack[stackCount++] = generateStackFrame (stackVals, word);
finalStack[stackCount++] = generateStackFrame (stackVals, word);
stackVals[0] = '\0';
stackVals[1] = '\0';
stackVals[2] = '\0';
stackVals[3] = '\0';
word = 0;
filled = 1;
availableBytes = 4;
}
// save stack frame
if (!availableBytes || !filled || (availableBytes!=4 && index == numVars-1)) {
finalStack[stackCount++] = generateStackFrame (stackVals, word);
if (word) word = 0;
stackVals[0] = '\0';
stackVals[1] = '\0';
stackVals[2] = '\0';
stackVals[3] = '\0';
availableBytes = 4;
}
}
// display stack frames
stackIndex = -(4 * stackCount);
printf ("\t _______________________________\n");
printf ("\t| | | |\n");
printf ("\t| OFFSET | STACK | MEMORY |\n");
printf ("\t|________|_____________|________|\n");
printf ("\t| |\n");
printf ("\t|\t --------------- LOW |\n");
for (index = stackCount-1; index >= 0; index--) {
printf ("\t| %d\t%s ^ |\n", stackIndex, finalStack[index]);
stackIndex += 4;
}
printf ("\t| %%fp -> -------------- HIGH |\n");
printf ("\t|_______________________________|\n");
for (index = 0; index < stackCount; index++) {
free (finalStack[index]);
}
return 0;
}