Note that I posted this thread earlier, I'm reposting because the issue has evolved some and I have a clearer idea of what the problem is.

I'm trying to resolve a segmentation fault that occurs in the traversal of a string array. My code is doing the following:

- open a file
- read hex strings from binary file compiled from simple c++ program
- filter out any strings that are not 8 bits long (everything else is garbage)
- convert strings to decimal representation of hex string
- load decimal values into array to be used by Verilog module

The rest is erroneous.

Here is my code:

#include "VMIPS.h"
#include "VMIPS_MIPS.h"//required to explicitly access signals from submodules
#include <verilated.h> 
#include <stdio.h>
#include <cmath>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cstdlib>
#include <vector>
using namespace std;

void outputLine( const string );
static inline int hexCharValue(char);

string array[274815];
unsigned int main_time = 0;
int i=0;
int k=0;//used for sorted array augmentation
int z = 0;//used for stream in counter
int main(int argc, char **argv) 
{
        //define local variables/arrays
        int temp;//hex conversaion accumulator
        string Hex;//dump variable for stream in
        
        //define objects
        ifstream inClientFile( "DAN_FILE.txt",ios::in );//stream in object
        Verilated::commandArgs(argc, argv);
	VMIPS *top = new VMIPS;
	top->CLK = 0;
        
        //popen();
        
        //test if instruction file can be opened
        if ( !inClientFile )
        {
            cerr << "File couldn't be opened" << endl;
            exit( 1 );
        }

        //fill string array with all file values and determines length of program
        while ( inClientFile >> Hex )
        {
            //fills array[..] with strings
            outputLine( Hex );
            i++;
        }

        z = i;
        cout << "Z:" << z << endl;
        int DataMem[z];
        int InstructionMemory[z];
        string tempInstructionMemory[z];

        //cut out undesired strings from array
        int u = 0;
        for(i=0;i<z;i++)
        {
                if ((array[i].length() == 8)&&((array[i].find("fs24")!=1)&&(array[i].find("f0")!=1)))
                {
                        tempInstructionMemory[k] = array[i];
                        k++;
                }
                else
                {
                     u++;   
                }
        }

        //convert string hex to numerical decimal
        for( int j=0;j<=z-u-1;j++ )//(z-u);j++ )//(z-u);j++ )//(z-u);j++ )
        {
                for( int y=7;y>=0;y--)
                {
                        InstructionMemory[j]+=hexCharValue(tempInstructionMemory[j][y])<<(4*(7-y));
                }
                temp = 0;
                //out << "Index:" << j << " HEX:" << tempInstructionMemory[j] << " DEC:" << InstructionMemory[j]<<endl;
        }

        //MIPS I processor interface
	while (!Verilated::gotFinish()) 
	{	
		
		top->CLK=!(top->CLK);
                top->Iin = InstructionMemory[top->Iaddr];
                top->eval();
                top->Din = DataMem[top->Daddr];
                DataMem[top->Daddr] = top->Dout;
		main_time++;
                printf("PCOut:%d",top->v->__PVT__PCout);//example of inner register access
                //printf("\nIaddr:%d Iin:%d CLK:%d Time:%d",top->Iaddr,top->Iin,top->CLK,main_time);
		if(top->CLK)
                {
                    printf("(%d)\n****************************************\n",main_time);
                }
                if(main_time>9)
		{
			printf("\n********** Complete **********\n\n");
			return 0;
		}
	}

        return 0;
}
//stream in helper function
void outputLine( const string Hex )
{
        array[i] = Hex;
}
//hex conversion helper function
static inline int hexCharValue(char ch)
{
    if (ch>='0' && ch<='9')return ch-'0';
    if (ch>='a' && ch<='f')return ch-'a'+10;
    return 0;
}
/*
 ***** Root Command Call *****

cd Desktop && cd verilator-3.802 && export VERILATOR_ROOT=//Users/dansnyder/Desktop/verilator-3.802 && cd test_MIPS && $VERILATOR_ROOT/bin/verilator --cc MIPS.v --exe sim_main.cpp && cd obj_dir/ && make -j -f VMIPS.mk VMIPS && cd .. && obj_dir/VMIPS && cd .. && cd .. && cd ..

*/

So the issue seems to be occurring at line 77. This line converts string hex numbers to decimal integers. If one were to spell out this line (which is how I originally had done it.) the code would be the following:

if( tempInstructionMemory[j].at(y) ==  '0' ) temp = (0*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '1' ) temp = (1*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '2' ) temp = (2*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '3' ) temp = (3*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '4' ) temp = (4*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '5' ) temp = (5*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '6' ) temp = (6*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '7' ) temp = (7*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '8' ) temp = (8*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  '9' ) temp = (9*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  'a' ) temp = (10*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  'b' ) temp = (11*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  'c' ) temp = (12*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  'd' ) temp = (13*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  'e' ) temp = (14*pow(16.,(int)(7-y)));
else if( tempInstructionMemory[j].at(y) ==  'f' ) temp = (15*pow(16.,(int)(7-y)));
InstructionMemory[j]=InstructionMemory[j]+temp;

Now, if I comment out the lines 5 and 11 I no longer get the segfault. If I change the argument of the pow function to anything between 0-5 and 8+ then the seg fault doesn't occur either. Any ideas?

Here is a very small excerpt from the binary file hex dump that I'm reading.

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf290
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
\margl1440\margr1440\vieww25480\viewh18700\viewkind0
\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

\f0\fs24 \cf0   0x00400130 3c1c1002 279ca240 0000f821 3c040040 <...'..@...!<..@\
  0x00400140 24840348 8fa50000 27a60004 3c01ffff $..H....'...<...\
  0x00400150 3421fff8 03a1e824 27bdffe0 3c070040 4!.....$'...<..@\
  0x00400160 24e700f8 3c08004b 2508b148 afa80010 $...<..K%..H....\
  0x00400170 afa20014 0c112298 afbd0018 1000ffff ......".........\
  0x00400180 00000000 00000000 00000000 00000000 ................\
  0x00400190 27bdffe8 3c020000 24420000 10400003 '...<...$B...@..\
  0x004001a0 afbf0010 0040f809 00000000 8fbf0010 .....@..........\
  0x004001b0 03e00008 27bd0018 00000000 00000000 ....'...........\
  0x004001c0 3c021001 90422440 27bdffe8 14400018 <....B$@'....@..\
  0x004001d0 afbf0010 3c021000 8c420014 8c430000 ....<....B...C..\
  0x004001e0 10600009 24420004 3c011000 0060f809 .`..$B..<....`..\
  0x004001f0 ac220014 3c021000 8c420014 8c430000 ."..<....B...C..\
  0x00400200 1460fff9 24420004 3c020044 24427714 .`..$B..<..D$Bw.\
  0x00400210 50400005 24020001 3c041000 0040f809 P@..$...<....@..\
  0x00400220 24842910 24020001 3c011001 a0222440 $.).$...<...."$@\
  0x00400230 8fbf0010 03e00008 27bd0018 27bdffe8 ........'...'...\
  0x00400240 afbf0010 8fbf0010 03e00008 27bd0018 ............'...\
  0x00400250 27bdffe8 3c020044 2442748c 3c041000 '...<..D$Bt.<...\
  0x00400260 24842910 3c051001 24a52444 10400003 $.).<...$.$D.@..\
  0x00400270 afbf0010 0040f809 00000000 3c041001 .....@......<...\
  0x00400280 24842244 8c820000 10400008 8fbf0010 $."D.....@......\
  0x00400290 3c020000 24420000 10400004 00000000 <...$B...@......\
  0x004002a0 0040f809 00000000 8fbf0010 03e00008 .@..............\
  0x004002b0 27bd0018 27bdffe8 afbf0010 8fbf0010 '...'...........\
  0x004002c0 03e00008 27bd0018 00000000 00000000 ....'.....

I'm not positive about this segment causing an issue. First lets make sure that I posted the correct cpp. Here's the most up to date code and this definitely causes a seg fault:

#include "VMIPS.h"
#include "VMIPS_MIPS.h"//required to explicitly access signals from submodules
#include <verilated.h> 
#include <stdio.h>
#include <cmath>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cstdlib>
#include <vector>
using namespace std;

void outputLine( const string );
static inline int hexCharValue(char);

char filename[50];
string array[274815];
unsigned int main_time = 0;
int i=0;
int k=0;//used for sorted array augmentation
int z = 0;//used for stream in counter
bool open = false;

int main(int argc, char **argv) 
{
        //define local variables/arrays
        int temp;//hex conversaion accumulator
        int letter;
        string Hex;//dump variable for stream in
        
        //define objects
        ifstream inClientFile( "DAN_FILE.txt",ios::in );//stream in object
        Verilated::commandArgs(argc, argv);
	VMIPS *top = new VMIPS;
	top->CLK = 0;
        FILE *fp;
        //popen();
        
        //test if instruction file can be opened
        if ( !inClientFile )
        {
            cerr << "File couldn't be opened" << endl;
            exit( 1 );
        }

        //fill string array with all file values and determines length of program
        while ( inClientFile >> Hex )
        {
            //fills array[..] with strings
            outputLine( Hex );
            i++;
        }

        z = i;
        cout << "Z:" << z << endl;
        int DataMem[z];
        int InstructionMemory[z];
        string tempInstructionMemory[z];

        //cut out undesired strings from array
        int u = 0;
        for(i=0;i<z;i++)
        {
                if ((array[i].length() == 8)&&((array[i].find("fs24")!=1)&&(array[i].find("f0")!=1)))
                {
                        tempInstructionMemory[k] = array[i];
                        k++;
                }
                else
                {
                     u++;   
                }
        }

        //convert string hex to numerical decimal
        for( int j=0;j<=z-u-1;j++ )//(z-u);j++ )//(z-u);j++ )//(z-u);j++ )
        {
                for( int y=7;y>=0;y--)
                {
                        InstructionMemory[j]+=hexCharValue(tempInstructionMemory[j][y])<<(4*(7-y));
                }
                temp = 0;
                //out << "Index:" << j << " HEX:" << tempInstructionMemory[j] << " DEC:" << InstructionMemory[j]<<endl;
        }

        //MIPS I processor interface
	while (!Verilated::gotFinish()) 
	{	
		
		top->CLK=!(top->CLK);
                top->Iin = InstructionMemory[top->Iaddr];
                top->eval();
                top->Din = DataMem[top->Daddr];
                DataMem[top->Daddr] = top->Dout;
		main_time++;
                printf("PCOut:%d",top->v->__PVT__PCout);//example of inner register access
                //printf("\nIaddr:%d Iin:%d CLK:%d Time:%d",top->Iaddr,top->Iin,top->CLK,main_time);
                
                //time stamp
		if( top->CLK )
                {
                    printf("(%d)\n****************************************\n",main_time);
                }
                if(main_time>9)
		{
                    printf("\n********** Complete **********\n\n");
                    return 0;
		}
                
                //SYSCAL
                if ( top->Iin == 3690987584 )//exit 1
                {
                    cout << "Exit" << endl;
                    return 0;
                }
                else if ( ( top->Iin == 3690987776 ) | ( open == true ) )//open 4
                {
                    if ( open == false )
                    {   
                        cout << "Enter file name: ";
                        cin >> filename;
                        cout << endl;
                        open = true;
                        fp = fopen(filename,"rb");
                        if( ( fp = fopen( "my.txt", "r")) == NULL)
                            puts("Cannot oepn the file");
                    }
                    else
                    {
                        if ( top->Iin ==  3690987648 )//read 2
                        {
                            while( ( letter = fgetc( fp ) ) != EOF)
                                printf("%c",letter);
                        }
                        else if ( top->Iin ==  3690987712 )//write 3
                        {
                            char input[1000];
                            cout << "Enter input to stream:";
                            fgets (input,999,stdin);
                            fputs (input,fp);
                        }
                    }
                }
                else if ( top->Iin == 3690987840 )//close 5
                {
                    fclose( fp );
                    open = false;
                }
                else if ( top->Iin == 3690987904 )//time 6
                {
                    cout << "Time:" << main_time << endl;
                }
	}

        return 0;
}
//stream in helper function
void outputLine( const string Hex )
{
        array[i] = Hex;
}
//hex conversion helper function
static inline int hexCharValue(char ch)
{
    if (ch>='0' && ch<='9')return ch-'0';
    if (ch>='a' && ch<='f')return ch-'a'+10;
    return 0;
}
/*
 ***** Root Command Call *****

cd Desktop && cd verilator-3.802 && export VERILATOR_ROOT=//Users/dansnyder/Desktop/verilator-3.802 && cd test_MIPS && $VERILATOR_ROOT/bin/verilator --cc MIPS.v --exe sim_main.cpp && cd obj_dir/ && make -j -f VMIPS.mk VMIPS && cd .. && obj_dir/VMIPS && cd .. && cd .. && cd ..

*/

And I'll include a larger swatch of data:

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf290
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
\margl1440\margr1440\vieww25480\viewh18700\viewkind0
\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural\pardirnatural

\f0\fs24 \cf0   0x00400130 3c1c1002 279ca240 0000f821 3c040040 <...'..@...!<..@\
  0x00400140 24840348 8fa50000 27a60004 3c01ffff $..H....'...<...\
  0x00400150 3421fff8 03a1e824 27bdffe0 3c070040 4!.....$'...<..@\
  0x00400160 24e700f8 3c08004b 2508b148 afa80010 $...<..K%..H....\
  0x00400170 afa20014 0c112298 afbd0018 1000ffff ......".........\
  0x00400180 00000000 00000000 00000000 00000000 ................\
  0x00400190 27bdffe8 3c020000 24420000 10400003 '...<...$B...@..\
  0x004001a0 afbf0010 0040f809 00000000 8fbf0010 .....@..........\
  0x004001b0 03e00008 27bd0018 00000000 00000000 ....'...........\
  0x004001c0 3c021001 90422440 27bdffe8 14400018 <....B$@'....@..\
  0x004001d0 afbf0010 3c021000 8c420014 8c430000 ....<....B...C..\
  0x004001e0 10600009 24420004 3c011000 0060f809 .`..$B..<....`..\
  0x004001f0 ac220014 3c021000 8c420014 8c430000 ."..<....B...C..\
  0x00400200 1460fff9 24420004 3c020044 24427714 .`..$B..<..D$Bw.\
  0x00400210 50400005 24020001 3c041000 0040f809 P@..$...<....@..\
  0x00400220 24842910 24020001 3c011001 a0222440 $.).$...<...."$@\
  0x00400230 8fbf0010 03e00008 27bd0018 27bdffe8 ........'...'...\
  0x00400240 afbf0010 8fbf0010 03e00008 27bd0018 ............'...\
  0x00400250 27bdffe8 3c020044 2442748c 3c041000 '...<..D$Bt.<...\
  0x00400260 24842910 3c051001 24a52444 10400003 $.).<...$.$D.@..\
  0x00400270 afbf0010 0040f809 00000000 3c041001 .....@......<...\
  0x00400280 24842244 8c820000 10400008 8fbf0010 $."D.....@......\
  0x00400290 3c020000 24420000 10400004 00000000 <...$B...@......\
  0x004002a0 0040f809 00000000 8fbf0010 03e00008 .@..............\
  0x004002b0 27bd0018 27bdffe8 afbf0010 8fbf0010 '...'...........\
  0x004002c0 03e00008 27bd0018 00000000 00000000 ....'...........\
  0x004002d0 27bdffe0 3403ffff afb10014 afb00010 '...4...........\
  0x004002e0 afbf0018 00a08021 10a3000f 00808821 .......!.......!\
  0x004002f0 3404ffff 12040005 8fbf0018 8fb10014 4...............\
  0x00400300 8fb00010 03e00008 27bd0020 5620fffb ........'.. V ..\
  0x00400310 8fbf0018 3c041001 0c1002d6 24842460 ....<.......$.$`\
  0x00400320 081000bf 8fbf0018 24030001 5483fff1 ........$...T...\
  0x00400330 3404ffff 3c041001 0c1002b3 24842460 4...<.......$.$`\
  0x00400340 081000bd 3404ffff 27bdffe8 3c041001 ....4...'...<...\
  0x00400350 24842c90 3c05004b 24a5b180 afbf0010 $.,.<..K$.......\
  0x00400360 0c109fb2 00000000 8fbf0010 00001021 ...............!\
  0x00400370 03e00008 27bd0018 27bdffe8 24040001 ....'...'...$...\
  0x00400380 afbf0010 0c1000b4 3405ffff 8fbf0010 ........4.......\
  0x00400390 03e00008 27bd0018 27bdffe8 00002021 ....'...'..... !\
  0x004003a0 afbf0010 0c1000b4 3405ffff 8fbf0010 ........4.......\
  0x004003b0 03e00008 27bd0018 00000000 00000000 ....'...........\
  0x004003c0 27bdffe8 3c021000 24420058 ac820000 '...<...$B.X....\
  0x004003d0 afbf0014 afb00010 8ca30000 3c02004b ............<..K\
  0x004003e0 9042c15c 00808021 8c67fff4 24840004 .B.\\...!.g..$...\
  0x004003f0 24060100 00671821 a0620000 0c11b048 $....g.!.b.....H\
  0x00400400 8ca50000 a2000103 8fbf0014 8fb00010 ................\
  0x00400410 03e00008 27bd0018 27bdffe8 3c021000 ....'...'...<...\
  0x00400420 24420058 ac820000 afbf0014 afb00010 $B.X............\
  0x00400430 8ca30000 3c02004b 9042c15c 00808021 ....<..K.B.\\...!\
  0x00400440 8c67fff4 24840004 24060100 00671821 .g..$...$....g.!\
  0x00400450 a0620000 0c11b048 8ca50000 a2000103 .b.....H........\
  0x00400460 8fbf0014 8fb00010 03e00008 27bd0018 ............'...\
  0x00400470 3c021000 24420058 27bdffe8 ac820000 <...$B.X'.......\
  0x00400480 afbf0010 0c10e490 00000000 8fbf0010 ................\
  0x00400490 03e00008 27bd0018 3c021000 24420058 ....'...<...$B.X\
  0x004004a0 27bdffe8 ac820000 afbf0010 0c10e490 '...............\
  0x004004b0 00000000 8fbf0010 03e00008 27bd0018 ............'...\
  0x004004c0 27bdffe8 3c021000 24420058 ac820000 '...<...$B.X....\
  0x004004d0 afb00010 afbf0014 0c10e490 00808021 ...............!\
  0x004004e0 0c10e438 02002021 8fbf0014 8fb00010 ...8.. !........\
  0x004004f0 03e00008 27bd0018 24820004 27bdfff0 ....'...$...'...\
  0x00400500 03e00008 27bd0010 27bdffe0 308400ff ....'...'...0...\
  0x00400510 afb00010 2c900001 afb20018 afbf001c ....,...........\
  0x00400520 afb10014 00108340 14800002 24120001 .......@....$...\
  0x00400530 24122000 3c041001 24842888 10800005 $. .<...$.(.....\
  0x00400540 24060010 3c051000 8ca52404 0c10ea6c $...<.....$....l\
  0x00400550 02003821 3c041001 24842914 10800005 ..8!<...$.).....\
  0x00400560 24060008 3c051000 8ca52400 0c10ea6c $...<.....$....l\
  0x00400570 02403821 3c041001 248429a0 10800005 .@8!<...$.).....\
  0x00400580 24060010 3c051000 8ca52408 0c10ea6c $...<.....$....l\
  0x00400590 02003821 3c021001 24422c90 1040000f ..8!<...$B,..@..\
  0x004005a0 00000000 24440008 0c10038b 24510004 ....$D......$Q..\
  0x004005b0 3c031000 24630dd4 24620014 3c051001 <...$c..$b..<...\
  0x004005c0 24a52888 3c011001 ac222c94 3c011001 $.(.<....",.<...\
  0x004005d0 ac232c90 0c11093b 02202021 3c021001 .#,....;.  !<...\
  0x004005e0 24422c00 10400011 00000000 2444000c $B,..@......$D..\
  0x004005f0 0c10038b 24510008 3c031000 246300c4 ....$Q..<...$c..\
  0x00400600 24620014 3c051001 24a52914 3c011001 $b..<...$.).<...\
  0x00400610 ac222c08 3c011001 ac232c00 0c11093b .",.<....#,....;\
  0x00400620 02202021 3c011001 ac202c04 3c021001 .  !<.... ,.<...\
  0x00400630 24422d1c 1040000e 24440008 0c10038b $B-..@..$D......\
  0x00400640 24510004 3c031000 24630dd4 24620014 $Q..<...$c..$b..\
  0x00400650 3c051001 24a529a0 3c011001 ac222d20 <...$.).<...."- \
  0x00400660 3c011001 ac232d1c 0c11093b 02202021 <....#-....;.  !\
  0x00400670 3c021001 24422da8 1040000e 24440008 <...$B-..@..$D..\
  0x00400680 0c10038b 24510004 3c031000 24630dd4 ....$Q..<...$c..\
  0x00400690 24620014 3c051001 24a529a0 3c011001 $b..<...$.).<...\
  0x004006a0 ac222dac 3c011001 ac232da8 0c11093b ."-.<....#-....;\
  0x004006b0 02202021 3c021001 24422c90 24032000 .  !<...$B,.$. .\
  0x004006c0 3c041001 24842a2c 3c011001 ac222c78 <...$.*,<....",x\
  0x004006d0 3c011001 ac232d2c 10800005 24060010 <....#-,....$...\
  0x004006e0 3c051000 8ca52404 0c10ec3d 02003821 <.....$....=..8!\
  0x004006f0 3c041001 24842ac8 10800005 02403821 <...$.*......@8!\
  0x00400700 3c051000 8ca52400 0c10ec3d 24060008 <.....$....=$...\
  0x00400710 3c041001 24842b64 10800005 02003821 <...$.+d......8!\
  0x00400720 3c051000 8ca52408 0c10ec3d 24060010 <.....$....=$...\
  0x00400730 3c021001 24422ec8 1040000f 00000000 <...$B...@......\
  0x00400740 24440008 0c10038b 24500004 3c031000 $D......$P..<...\
  0x00400750 24630da4 24620014 3c051001 24a52a2c $c..$b..<...$.*,\
  0x00400760 3c011001 ac222ecc 3c011001 ac232ec8 <...."..<....#..\
  0x00400770 0c110b78 02002021 3c021001 24422e34 ...x.. !<...$B.4\
  0x00400780 10400011 00000000 2444000c 0c10038b .@......$D......\
  0x00400790 24500008 3c021000 24420094 24430014 $P..<...$B..$C..\
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  0x004017f0 00000000 8e030000 8c64fff4 02042021 .........d.... !\
  0x00401800 8c850014 0c110751 34a50001 8e020000 .......Q4.......\
  0x00401810 8c43fff4 02031821 8c620010 30420001 .C.....!.b..0B..\
  0x00401820 14400005 00000000 0c10e001 00000000 .@..............\
  0x00401830 081005ef 02001021 0c10e581 00000000 .......!........\
  0x00401840 0c10e001 00808021 02002021 0c111bab .......!.. !....\
  0x00401850 00000000 27bdff98 afb00058 00808021 ....'......X...!\
  0x00401860 afb1005c 27a40048 00a08821 00003021 ...\\'..H...!..0!\
  0x00401870 afbf0060 0c100fab 02002821 93a20048 ...`......(!...H\
  0x00401880 10400039 02001021 8e040000 afa0004c .@.9...!.......L\
  0x00401890 8c82fff4 02021021 8c430084 1060003a .......!.C...`.:\
  0x004018a0 00000000 8c83fff4 8e050000 2404ffff ............$...\
  0x004018b0 02031821 8c660078 afa40034 afa4003c ...!.f.x...4...<\
  0x004018c0 afa00038 afa60030 8ca2fff4 8c650084 ...8...0.....e..\
  0x004018d0 27a3004c 02021021 8ca70000 24420004 '..L...!....$B..\
  0x004018e0 afa20018 27a20050 afa40014 afa40044 ....'..P.......D\
  0x004018f0 afa3001c afa20020 afa60040 afa00010 ....... ...@....\
  0x00401900 8ce2000c 27a40028 0040f809 2407ffff ....'..(.@..$...\
  0x00401910 8fa3004c 30620004 14400018 00602821 ...L0b...@...`(!\
  0x00401920 8fa40050 3c028000 0082102a 54400014 ...P<......*T@..\
  0x00401930 34a30004 3c027fff 3442ffff 0044102a 4...<...4B...D.*\
  0x00401940 5440000f 34a30004 ae240000 8e020000 T@..4....$......\
  0x00401950 8c44fff4 02042021 8c850014 0c110751 .D.... !.......Q\
  0x00401960 00a32825 02001021 8fbf0060 8fb1005c ..(%...!...`...\\\
  0x00401970 8fb00058 03e00008 27bd0068 34a30004 ...X....'..h4...\
  0x00401980 08100653 afa3004c 0c1103dc 00000000 ...S...L........\
  0x00401990 08100629 8e040000 24020001 14a20019 ...)....$.......\
  0x004019a0 00000000 0c10dfe8 00000000 8e030000 ................\
  0x004019b0 8c64fff4 02042021 8c850014 0c110751

Everything that handles syscalls and the MIPS object (verilator related things) can be commented out as it has no effect on this issue.

Edited 6 Years Ago by dansnyderECE: n/a

I don't get a segfault even with this sample. If you do, this would point to lines 57, 58, and 59. Switch to vectors, or at least use new int[z]

Thanks for taking a look at it. I'm going to run a few data subsets and see what happens. If I still get the fault I'll switch to vector.

It would really help if you could post the entire input file, that would allow us to debug the code and quickly find the remaining issues.

Of course, it would save yourself a lot of time in the future if you just learn on how to use the debugger yourself. It will tell you exactly at which point in the code the segmentation fault occurs and allows you to check the value of all variables to give you a hint why it occurred.

Other than the debugger, you can define _GLIBCXX_DEBUG for your project. This will alert you if any out-of-bound accesses happens in a standard container. However, that requires you to consequently use vectors instead of arrays, of course.

I'm having difficulty uploading the entire data file for some reason. It is 2.9MB so I'm not sure why. Regardless, I'm getting the same segfault for the samples I supplied. I'll re-post the most up to date code now, which is giving me a segfault right now, with the second sample I supplied.

I definitely should learn to use a debugger in this context. I'm used to using HI-TECH's compiler and debugger but that's a different world. What would you suggest? I'm working from a Mac and I'm compiling my program with Verilator (a Verilog/c++ interface compiler.)

The only reason why I'm really shying away from vectors is because I'm unfamiliar with them and I'm trying to do this relatively quickly. This isn't my field of expertise obviously (yet) so I'm dragging my feet a bit. Can you refer me to any good text references that outline and give examples of c++ code? I'm working from Deitel and Deitel at the moment.

#include "VMIPS.h"
#include "VMIPS_MIPS.h"//required to explicitly access signals from submodules
#include <verilated.h> 
#include <stdio.h>
#include <cmath>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cstdlib>
#include <vector>
using namespace std;

void outputLine( const string );
static inline int hexCharValue(char);

char filename[50];
string array[274815];
unsigned int main_time = 0;
int i=0;
int k=0;//used for sorted array augmentation
int z = 0;//used for stream in counter
bool open = false;

int main(int argc, char **argv) 
{
        //define local variables/arrays
        int temp;//hex conversion accumulator
        int letter;
        string Hex;//dump variable for stream in
        
        //define objects
        ifstream inClientFile( "DAN_FILE.txt",ios::in );//stream in object
        Verilated::commandArgs(argc, argv);
	VMIPS *top = new VMIPS;
	top->CLK = 0;
        FILE *fp;
        //popen();
        
        //test if instruction file can be opened
        if ( !inClientFile )
        {
            cerr << "File couldn't be opened" << endl;
            exit( 1 );
        }

        //fill string array with all file values and determines length of program
        while ( inClientFile >> Hex )
        {
            //fills array[..] with strings
            outputLine( Hex );
            i++;
        }

        z = i;
        cout << "Z:" << z << endl;
        int DataMem[z];
        int InstructionMemory[z];
        string tempInstructionMemory[z];

        //cut out undesired strings from array
        int u = 0;
        for(i=0;i<z;i++)
        {
                if ((array[i].length() == 8)&&((array[i].find("fs24")!=1)&&(array[i].find("f0")!=1)))
                {
                        tempInstructionMemory[k] = array[i];
                        k++;
                }
                else
                {
                     u++;   
                }
        }

        //convert string hex to numerical decimal
        for( int j=0;j<=z-u-1;j++ )//(z-u);j++ )//(z-u);j++ )//(z-u);j++ )
        {
                for( int y=7;y>=0;y--)
                {
                        InstructionMemory[j]+=hexCharValue(tempInstructionMemory[j][y])<<(4*(7-y));
                }
                temp = 0;
                //out << "Index:" << j << " HEX:" << tempInstructionMemory[j] << " DEC:" << InstructionMemory[j]<<endl;
        }

        //MIPS I processor interface
	while (!Verilated::gotFinish()) 
	{	
		
		top->CLK=!(top->CLK);
                top->Iin = InstructionMemory[top->Iaddr];
                top->eval();
                top->Din = DataMem[top->Daddr];
                DataMem[top->Daddr] = top->Dout;
		main_time++;
                printf("PCOut:%d",top->v->__PVT__PCout);//example of inner register access
                //printf("\nIaddr:%d Iin:%d CLK:%d Time:%d",top->Iaddr,top->Iin,top->CLK,main_time);
                
                //time stamp
		if( top->CLK )
                {
                    printf("(%d)\n****************************************\n",main_time);
                }
                if(main_time>9)
		{
                    printf("\n********** Complete **********\n\n");
                    return 0;
		}
                
                
               //v     __PVT__RegisterFile__DOT__Reg[32]
                
                
                //SYSCALL (checks RegFile[2] "v0" for syscall type)
                if ( top->v->__PVT__RegisterFile__DOT__Reg[2] == 3690987584 )//exit 1
                {
                    cout << "Exit" << endl;
                    return 0;
                }
                else if ( ( top->v->__PVT__RegisterFile__DOT__Reg[2] == 3690987776 ) | ( open == true ) )//open 4
                {
                    if ( open == false )//allows access to open file protocol
                    {   
                        *filename = top->a0;//get filename from "a0" reg
                        open = true;//enable read\write
                        fp = fopen(filename,"rb");//generate file descriptor
                        //top->v->__PVT__RegisterFile__DOT__Reg[2] = fp;//write file descriptor to "v0" reg
                        if( ( fp = fopen( filename, "r")) == NULL)
                        {
                            puts("Cannot open the file");
                            top->v->__PVT__RegisterFile__DOT__Reg[2] = -1;
                        }
                    }
                    else//only accessable if a file is open
                    {
                        if ( top->v->__PVT__RegisterFile__DOT__Reg[2] ==  3690987648 )//read 2
                        {
                            int max = 0;
                            while(( ( letter = fgetc( fp ) ) != EOF) | (max != top->a2))
                            {
                                printf("%c",letter);
                                max++;
                            }
                            //top->v->__PVT__RegisterFile__DOT__Reg[2] = max;//number of characters read
                        }
                        else if ( top->v->__PVT__RegisterFile__DOT__Reg[2] ==  3690987712 )//write 3
                        {
                            //char input[1000];
                            //cout << "Enter input to stream:";
                            //fgets (input,999,stdin);
                            //fputs (input,fp);
                        }
                    }
                }
                else if ( top->v->__PVT__RegisterFile__DOT__Reg[2] == 3690987840 )//close 5
                {
                    fclose( fp );
                    open = false;
                }
                else if ( top->v->__PVT__RegisterFile__DOT__Reg[2] == 3690987904 )//time 6
                {
                    cout << "Time:" << main_time << endl;
                }
	}

        return 0;
}
//stream in helper function
void outputLine( const string Hex )
{
        array[i] = Hex;
}
//hex conversion helper function
static inline int hexCharValue(char ch)
{
    if (ch>='0' && ch<='9')return ch-'0';
    if (ch>='a' && ch<='f')return ch-'a'+10;
    return 0;
}
/*
 ***** Root Command Call *****

cd Desktop && cd verilator-3.802 && export VERILATOR_ROOT=//Users/dansnyder/Desktop/verilator-3.802 && cd test_MIPS && $VERILATOR_ROOT/bin/verilator --cc MIPS.v --exe sim_main.cpp && cd obj_dir/ && make -j -f VMIPS.mk VMIPS && cd .. && obj_dir/VMIPS && cd .. && cd .. && cd ..

*/

Edited 6 Years Ago by dansnyderECE: n/a

I'm having difficulty uploading the entire data file for some reason. It is 2.9MB so I'm not sure why. Regardless, I'm getting the same segfault for the samples I supplied. I'll re-post the most up to date code now, which is giving me a segfault right now, with the second sample I supplied.

The sample doesn't cause a crash for me. It looks pretty weird, though. I mean, the RTF markup can't possibly be part of the real document, or can it?
To upload the file, just use some file hoster like Mediafire and delete it once this has been solved.

I definitely should learn to use a debugger in this context. I'm used to using HI-TECH's compiler and debugger but that's a different world. What would you suggest? I'm working from a Mac and I'm compiling my program with Verilator (a Verilog/c++ interface compiler.)

I assume the actual compiler used is g++. So gdb is the debugger you should use. Don't forget to add debug information when compiling (-g switch).

The only reason why I'm really shying away from vectors is because I'm unfamiliar with them and I'm trying to do this relatively quickly. This isn't my field of expertise obviously (yet) so I'm dragging my feet a bit. Can you refer me to any good text references that outline and give examples of c++ code? I'm working from Deitel and Deitel at the moment.

All you need to know about the standard library is on the reference on this site:
http://www.cplusplus.com/reference/stl/vector/

Still, a good C++ book should explain vectors shortly after the beginning.

Edited 6 Years Ago by Aranarth: n/a

I fixed up the code a bit. It's still not perfect... normally you would use iterators in the loops and a proper check whether a word is actually a valid hex string would be in order as well (edit: now taken care of).
Still, I'm pretty sure that the code cannot cause any segmentation faults anymore. I left the Verilated related code commented out and didn't touch it. If you still get segfaults, the problem is in there.

Some problems I saw when I went through the code:

1. You used InstructionMemory's elements, even though they were uninitialized. Elements of int vectors will be initialized to 0, but that does not apply to arrays.
2. You used various global variables without any reason. They didn't have any helpful names either. This severely limits readability. Variables should be defined as locally as possible for the same reason.
3. You used "z", a non-constant for your array sizes. This is not legal C++, even though it works with gcc.
4. You filtered out words with f0 at position 1, thus filtering some valid hex strings.

Edit: 5. ...and you included some stray strings on the right side of the file. Since there were a few spaces, some words there happened to have the length 8.
I now included a proper check and eliminated the now somewhat obsolete tempInstructionMemory.
Still, in theory valid hex strings could appear on the right side.

//#include "VMIPS.h"
//#include "VMIPS_MIPS.h"//required to explicitly access signals from submodules
//#include <verilated.h>

#include <cstdio>
#include <cmath>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cstdlib>
#include <vector>
#include <cassert>
using namespace std;

static inline int hexCharValue(char ch)
{
    if (ch>='0' && ch<='9')return ch-'0';
    if (ch>='a' && ch<='f')return ch-'a'+10;
    assert(false); //should never get here
}

static inline bool isHexChar(char ch)
{
  return (ch>='0' && ch<='9') || (ch>='a' && ch<='f');
}

static bool isValidHexString(const string& str)
{
  if (str.length()!=8)return false;
  for (uint i=0;i<str.length();i++)if (!isHexChar(str[i]))return false;
  return true;
}

int main(int argc, char **argv)
{
    ifstream inClientFile( "DAN_FILE.txt",ios::in ); //stream object

    //Verilated::commandArgs(argc, argv);
    //VMIPS *top = new VMIPS;
    //top->CLK = 0;

    //test if instruction file can be opened
    if ( !inClientFile )
    {
      cerr << "File couldn't be opened" << endl;
      return 1; //no point using exit inside main
    }

    vector<string> words;
    words.reserve(175110);
    string word;
    while (inClientFile >> word)
    { //helper function is unnecessary, can check for validity right now
      if (isValidHexString(word))words.push_back(word);
    }

    cout << "Number of valid words: " << words.size() << endl;

    vector<int> InstructionMemory;
    //convert string hex to numerical decimal
    InstructionMemory.resize(words.size());
    for( int j=0; j<words.size(); j++ )
    {
        for( int y=0; y<8; y++)
        {
            InstructionMemory[j]+=hexCharValue(words[j][y])<<(4*(7-y));
        }
    }

    //you'll have to add DataMem here - I have no idea what it is for

    //MIPS I processor interface
    /*while (!Verilated::gotFinish())
    {

    	top->CLK=!(top->CLK);
                top->Iin = InstructionMemory[top->Iaddr];
                top->eval();
                top->Din = DataMem[top->Daddr];
                DataMem[top->Daddr] = top->Dout;
    	main_time++;
                printf("PCOut:%d",top->v->__PVT__PCout);//example of inner register access
                //printf("\nIaddr:%d Iin:%d CLK:%d Time:%d",top->Iaddr,top->Iin,top->CLK,main_time);

                //time stamp
    	if( top->CLK )
                {
                    printf("(%d)\n****************************************\n",main_time);
                }
                if(main_time>9)
    	{
                    printf("\n********** Complete **********\n\n");
                    return 0;
    	}

                //SYSCAL
                if ( top->Iin == 3690987584 )//exit 1
                {
                    cout << "Exit" << endl;
                    return 0;
                }
                else if ( ( top->Iin == 3690987776 ) | ( open == true ) )//open 4
                {
                    if ( open == false )
                    {
                        cout << "Enter file name: ";
                        cin >> filename;
                        cout << endl;
                        open = true;
                        fp = fopen(filename,"rb");
                        if( ( fp = fopen( "my.txt", "r")) == NULL)
                            puts("Cannot oepn the file");
                    }
                    else
                    {
                        if ( top->Iin ==  3690987648 )//read 2
                        {
                            while( ( letter = fgetc( fp ) ) != EOF)
                                printf("%c",letter);
                        }
                        else if ( top->Iin ==  3690987712 )//write 3
                        {
                            char input[1000];
                            cout << "Enter input to stream:";
                            fgets (input,999,stdin);
                            fputs (input,fp);
                        }
                    }
                }
                else if ( top->Iin == 3690987840 )//close 5
                {
                    fclose( fp );
                    open = false;
                }
                else if ( top->Iin == 3690987904 )//time 6
                {
                    cout << "Time:" << main_time << endl;
                }
    }*/
}

Edited 6 Years Ago by Aranarth: n/a

The seg fault is definitely gone. Thanks for sifting through my code and fixing it. I'm going to go through what you have changed in detail, I need to alter my code methodology significantly so I can get to this point when designing a new test-bench. DataMem is going to be implemented in the same exact way. InstructionMem is just a hypothetical storage element to supply my processor with instructions via PC addressing. The DataMem is the actual memory element (data cache) for the processor. Because I can disassemble the binary into these two segments I'll just dump instructions into one file, data into another and load them serially into my instruction and data vectors.

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