c++ - How do I edit the contents of a Qvector that is within a Qvector -
i'm writing program simulate cache. i'm using qvector structure. have qvector of qvectors of ints. when try edit integers, causes runtime error:
*** glibc detected *** ./comporgproject3: free(): invalid next size (fast): 0x00000000010d2550 *** ======= backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x7eb96)[0x7fd31b469b96] ./comporgproject3[0x402558] ./comporgproject3[0x402bf3] ./comporgproject3[0x402005] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7fd31b40c76d] ./comporgproject3[0x4023c1] ======= memory map: ======== 00400000-00405000 r-xp 00000000 08:01 404625 /home/**/documents/comporgproject3/comporgproject3 00604000-00605000 r--p 00004000 08:01 404625 /home/**/documents/comporgproject3/comporgproject3 00605000-00606000 rw-p 00005000 08:01 404625 /home/**/documents/comporgproject3/comporgproject3 010cb000-010ec000 rw-p 00000000 00:00 0 here cod being run: main:
#include <fstream> #include <qstringlist> #include <iostream> #include <qfile> #include <qtextstream> #include <qdebug> #include <cstdlib> #include <string> #include "cache.h" using namespace std; int main() { qfile instfile; instfile.setfilename("test.trace"); int cachesizes[4] = {1024, 4096, 16384, 65536}; int blocksizes[4] = {8, 16, 32, 64}; qstring types[4] = {"dm", "2w", "4w" , "fa"}; if(!instfile.open(qiodevice::readonly)) { return -1; } qtextstream in(&instfile); qstringlist instlist; while(!in.atend()) { qstring temp; temp = in.readline(); instlist.append(temp); } for(int = 0; < instlist.size(); i++) { cout << instlist.at(i).tostdstring() << "\n"; } for(int = 0; < 4; i++) { for(int j = 0; j < 4; j++) { for(int k = 0; k < 4; k++) { cache c(cachesizes[i], blocksizes[j], types[k], instlist); c.simulatecache(); } } } return 0; } this simulate function have qvectors:
void cache::simulatecache() { if(this->instlist.size() < 1) { screenout << "cannot simulate cache: there no instructions"; } else { screenout << "starting simulation...\n"; int entry_per_block = block_size / 4; block_count = cache_size / block_size; qvector<qvector<int> > ca(block_count); for(int = 0; < block_count; i++) { ca[i].resize(entry_per_block); } screenout << "qvector created.\n"; for(int = 0; < this->instlist.size(); i++) { qstringlist inst_parts = instlist.at(i).split(qregexp(" ")); qstring insttype = inst_parts.at(0); int mem_addr = inst_parts.at(1).toint(0, 16); if(this->type.compare("dm") == 0) { int block_index = (int) (mem_addr / block_size) % block_count; int block_offset = mem_addr % block_size; if(ca.at(block_index).at(block_offset) == mem_addr) { this->hits++; if(insttype.compare("w") == 0) { this->cachetomem+=block_size; } } else { this->misses++; this->memtocache += block_size; ca[block_index][block_offset] = mem_addr; if(insttype.compare("w") == 0) { this->cachetomem+=block_size; } for(int = block_offset - 1; >= 0; i--) { //ca[block_index][i] = mem_addr - ((block_offset - i) * 4); //ca[block_index].insert(i, mem_addr - ((block_offset - i) * 4) ); } for(int = block_offset + 1; < entry_per_block; i++) { //ca[block_index][i] = mem_addr + ((i - block_offset) * 4)); //ca[block_index].insert(i, mem_addr + ((i - block_offset) * 4)); } } } } hit_rate = hits / instlist.size(); screenout << hit_rate << "\n"; } } this line causing error, believe:
ca[block_index][block_offset] = mem_addr;
here simple example of using nested qvector. may want check out link:
http://www.qtcentre.org/threads/49026-2d-array-in-qt-qvector-or-qlist
also want throw qdebug statements code see if have many elements think do.
qvector < qvector < int > > matrix; matrix.resize(10); for(int = 0; i< matrix.size(); i++) { // note can't use foreach here! matrix[i].resize(10); } // sanity check: qdebug() << matrix.size() << matrix.at(0).size(); for(int r = 0; r < matrix.size(); r++) { for(int c = 0; c < matrix.at(r).size(); c++) { matrix[r][c] = 10; // qdebug() << matrix[r][c]; } } hope helps.
edit: here example check out:
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