4coder-non-source/test_data/lots_of_files/ssol.c

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2023-09-30 01:17:40 +00:00
/*
* Instruction-level simulator for the LC
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define NUMMEMORY 65536 /* maximum number of words in memory */
#define NUMREGS 8 /* number of machine registers */
#define MAXLINELENGTH 1000
#define ADD 0
#define NAND 1
#define LW 2
#define SW 3
#define BEQ 4
#define JALR 5
#define HALT 6
#define NOOP 7
typedef struct stateStruct {
int pc;
int mem[NUMMEMORY];
int reg[NUMREGS];
int numMemory;
} stateType;
void printState(stateType *);
void run(stateType);
int convertNum(int);
int
main(int argc, char *argv[])
{
int i;
char line[MAXLINELENGTH];
stateType state;
FILE *filePtr;
if (argc != 2) {
printf("error: usage: %s <machine-code file>\n", argv[0]);
exit(1);
}
/* initialize memories and registers */
for (i=0; i<NUMMEMORY; i++) {
state.mem[i] = 0;
}
for (i=0; i<NUMREGS; i++) {
state.reg[i] = 0;
}
state.pc=0;
/* read machine-code file into instruction/data memory (starting at
address 0) */
filePtr = fopen(argv[1], "r");
if (filePtr == NULL) {
printf("error: can't open file %s\n", argv[1]);
perror("fopen");
exit(1);
}
for (state.numMemory=0; fgets(line, MAXLINELENGTH, filePtr) != NULL;
state.numMemory++) {
if (state.numMemory >= NUMMEMORY) {
printf("exceeded memory size\n");
exit(1);
}
if (sscanf(line, "%d", state.mem+state.numMemory) != 1) {
printf("error in reading address %d\n", state.numMemory);
exit(1);
}
printf("memory[%d]=%d\n", state.numMemory, state.mem[state.numMemory]);
}
printf("\n");
/* run never returns */
run(state);
return(0);
}
void
run(stateType state)
{
int arg0, arg1, arg2, addressField;
int instructions=0;
int opcode;
int maxMem=-1; /* highest memory address touched during run */
for (; 1; instructions++) { /* infinite loop, exits when it executes halt */
printState(&state);
if (state.pc < 0 || state.pc >= NUMMEMORY) {
printf("pc went out of the memory range\n");
exit(1);
}
maxMem = (state.pc > maxMem)?state.pc:maxMem;