Init commit working "another_memcheck"

This commit is contained in:
Stephen Seo 2024-06-04 11:59:36 +09:00
commit 5154281078
3 changed files with 817 additions and 0 deletions

680
src/another_memcheck.cc Normal file
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@ -0,0 +1,680 @@
// Standard library includes.
#include <cstdlib>
#include <iostream>
#include <cstring>
#include <cstdio>
// Local includes.
#include "another_memcheck.h"
namespace SC_AM_Internal {
Stats *stats = nullptr;
/* unsigned char data[DATA_BLOCK_SIZE * DATA_ITEMS_SIZE] = {*/
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/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,*/
/* };*/
/* unsigned int data_offset = 0;*/
/* void *alt_malloc() {*/
/* unsigned int prev_offset = data_offset;*/
/* while (data[data_offset + 23] != 0) {*/
/* data_offset += DATA_BLOCK_SIZE;*/
/* if (data_offset >= DATA_BLOCK_SIZE + DATA_ITEMS_SIZE) {*/
/* data_offset = 0;*/
/* }*/
/* if (data_offset == prev_offset) {*/
/* std::clog << "WARNING: alt_malloc ran out of space!\n";*/
/* return nullptr;*/
/* }*/
/* }*/
/* data[data_offset + 23] = 1;*/
/* return &data[data_offset];*/
/* }*/
/* void alt_free(void *ptr) {*/
/* unsigned int data_offset = static_cast<unsigned int>(reinterpret_cast<char*>(ptr) - &data[0]);*/
/* if (data[data_offset + 23] == 1) {*/
/* data[data_offset + 23] = 0;*/
/* } else {*/
/* std::clog << "WARNING: alt_free: attempted invalid free!\n";*/
/* }*/
/* }*/
Stats *get_init_stats() {
Stats *stats = reinterpret_cast<SC_AM_Internal::Stats*>(
real_malloc(sizeof(Stats)));
stats->initialize();
return stats;
}
void *(*real_malloc)(std::size_t) = nullptr;
void (*real_free)(void*) = nullptr;
/* void *alt_malloc(std::size_t size, FILE **fd_out) {*/
/* std::size_t mult_of_eight = size % 8;*/
/* if (mult_of_eight == 0) {*/
/* mult_of_eight = size;*/
/* } else {*/
/* mult_of_eight = size + (8 - mult_of_eight);*/
/* }*/
/**/
/* if (data_offset + mult_of_eight >= DATA_SIZE) {*/
/* return nullptr;*/
/* } else {*/
/* data_offset += mult_of_eight;*/
/* return &data[data_offset - mult_of_eight];*/
/* }*/
/* }*/
/**/
Malloced::Malloced() : address(nullptr), size(0) {}
Malloced::Malloced(void *address, std::size_t size) : address(address), size(size) {}
/* // Default allocators are stateless, but define constructor anyways.*/
/* RealAllocator::RealAllocator() : std::allocator<MapDataType>(), real_malloc(nullptr) {}*/
/**/
/* RealAllocator::~RealAllocator() {}*/
/**/
/* MapDataType *RealAllocator::allocate(std::size_t n, const void *hint) {*/
/* // TODO*/
/* }*/
/**/
/* void RealAllocator::deallocate(MapDataType *ptr, std::size_t n) {*/
/* // TODO*/
/* }*/
Stats::Stats() : malloced_list(nullptr) {
// TODO maybe remove this.
/* on_exit([] ([[maybe_unused]] int status, void *ptr) {*/
/* const Stats *stats = reinterpret_cast<const Stats*>(ptr);*/
/* stats->print_status();*/
/* }, this);*/
}
void Stats::initialize() {
malloced_list = reinterpret_cast<ListNode*>(real_malloc(sizeof(ListNode)));
malloced_list->next = nullptr;
malloced_list->data = nullptr;
on_exit([] ([[maybe_unused]] int status, void *ptr) {
const Stats *stats = reinterpret_cast<const Stats*>(ptr);
stats->print_status();
}, this);
}
void *Stats::do_malloc(std::size_t size) {
/* std::clog << "do_malloc...\n";*/
void *address = real_malloc(size);
if (address != nullptr) {
auto *node = malloced_list;
while (node->next != nullptr) {
node = node->next;
}
node->next = reinterpret_cast<ListNode*>(real_malloc(sizeof(ListNode)));
node->next->next = nullptr;
node->next->data = reinterpret_cast<Malloced*>(real_malloc(sizeof(Malloced)));
node->next->data->address = address;
node->next->data->size = size;
/* malloced_addresses.insert(std::make_pair(*/
/* address,*/
/* Malloced(*/
/* address,*/
/* size)*/
/* ));*/
}
return address;
}
void Stats::do_free(void *ptr) {
/* std::clog << "do_free...\n";*/
if (ptr) {
/* if (auto iter = malloced_addresses.find(ptr); iter == malloced_addresses.end()) {*/
/* // TODO: Check that this formatting works.*/
/* std::cerr << std::format("Attempted invalid free with {}!\n", iter->first);*/
/* //std::cerr << std::format("Attempted invalid free with {:llu}!\n", iter->first);*/
/* } else {*/
/* malloced_addresses.erase(ptr);*/
/* std::free(ptr);*/
/* }*/
auto *node = malloced_list;
decltype(node) parent_node;
while (node->next != nullptr) {
parent_node = node;
node = node->next;
if (node->data && node->data->address == ptr) {
real_free(node->data);
parent_node->next = node->next;
real_free(node);
break;
}
}
}
}
void Stats::print_status() const {
std::clog << "List of unfreed memory:\n";
/* for (const auto &pairs : malloced_addresses) {*/
/* std::clog << std::format(" 0x{}: size {}\n", pairs.first, pairs.second.size);*/
/* }*/
auto *node = malloced_list;
[[maybe_unused]]
decltype(node) parent_node;
while (node->next != nullptr) {
parent_node = node;
node = node->next;
/* std::clog << std::format(" 0x{}: size {}\n", node->data->address, node->data->size);*/
std::clog << " " << node->data->address << ": size " << node->data->size << '\n';
// TODO May not need to free data at end of program, as OS should reclaim data.
/* if (parent_node->data) {*/
/* real_free(parent_node->data);*/
/* }*/
/* real_free(parent_node);*/
}
}
}
// vim: et sw=2 ts=2 sts=2

83
src/another_memcheck.h Normal file
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@ -0,0 +1,83 @@
#ifndef SEODISPARATE_COM_ANOTHER_MEMCHECK_H
#define SEODISPARATE_COM_ANOTHER_MEMCHECK_H
// Standard library includes.
/*#include <unordered_map>*/
/*#include <memory>*/
/*#include <cstdio>*/
namespace SC_AM_Internal {
// Forward declaration.
struct Stats;
extern Stats *stats;
Stats *get_init_stats();
constexpr unsigned int DATA_BLOCK_SIZE = 24;
constexpr unsigned int DATA_ITEMS_SIZE = 500;
/// Assumes each data block is 24 bytes.
/* extern unsigned char data[DATA_BLOCK_SIZE * DATA_ITEMS_SIZE];*/
/* extern unsigned int data_offset;*/
extern void *(*real_malloc)(std::size_t size);
extern void (*real_free)(void *ptr);
/// Always returns DATA_BLOCK_SIZE blocks of memory.
/* void *alt_malloc();*/
/* void alt_free(void *ptr);*/
struct Malloced {
Malloced();
Malloced(void *address, std::size_t size);
void* address;
std::size_t size;
};
// TODO: hashmap for faster memchecking.
struct ListNode {
ListNode() : next(nullptr), data(nullptr) {}
ListNode *next;
Malloced *data;
};
using MapDataType = std::pair<const void*, Malloced>;
/* struct RealAllocator : public std::allocator<MapDataType> {*/
/* // Default allocators are stateless, but declare constructor anyways.*/
/* RealAllocator();*/
/* virtual ~RealAllocator();*/
/**/
/* MapDataType *allocate(std::size_t n, const void *hint = 0) override;*/
/* void deallocate(MapDataType *ptr, std::size_t n) override;*/
/* };*/
struct Stats {
Stats();
/* void *(*real_malloc)(std::size_t);*/
/* void (*real_free)(void*) noexcept;*/
/* std::unordered_map<void*,*/
/* Malloced,*/
/* std::hash<void*>,*/
/* std::equal_to<void*>,*/
/* RealAllocator> malloced_addresses;*/
ListNode *malloced_list;
void initialize();
void *do_malloc(std::size_t size);
void do_free(void *ptr);
void print_status() const;
};
}
#endif
// vim: et sw=2 ts=2 sts=2

View file

@ -0,0 +1,54 @@
// Standard library includes.
#include <iostream>
/*#include <cstdlib>*/
/*#include <cstdio>*/
// Unix includes.
#include <dlfcn.h>
// Local includes.
#include "another_memcheck.h"
extern "C" {
void *malloc(std::size_t size) {
std::clog << "attempting to malloc size: " << size << "...\n";
if (SC_AM_Internal::real_malloc == nullptr) {
SC_AM_Internal::real_malloc = reinterpret_cast<void*(*)(std::size_t)>(dlsym(RTLD_NEXT, "malloc"));
}
if (SC_AM_Internal::stats == nullptr) {
/* std::clog << "Mallocing stats global ptr...\n";*/
SC_AM_Internal::stats = SC_AM_Internal::get_init_stats();
/* std::clog << "Malloced stats global ptr...\n";*/
/* SC_AM_Internal::stats = reinterpret_cast<SC_AM_Internal::Stats*>(*/
/* SC_AM_Internal::real_malloc(sizeof(SC_AM_Internal::Stats)));*/
/* std::clog << "Initializing stats global ptr...\n";*/
/* SC_AM_Internal::stats->initialize();*/
}
return SC_AM_Internal::stats->do_malloc(size);
}
void free(void *ptr) {
std::clog << "attempting to free...\n";
if (SC_AM_Internal::real_free == nullptr) {
SC_AM_Internal::real_free = reinterpret_cast<void(*)(void*)>(dlsym(RTLD_NEXT, "free"));
}
if (SC_AM_Internal::stats == nullptr) {
/* std::clog << "Mallocing stats global ptr...\n";*/
SC_AM_Internal::stats = SC_AM_Internal::get_init_stats();
/* std::clog << "Malloced stats global ptr...\n";*/
/* SC_AM_Internal::stats = reinterpret_cast<SC_AM_Internal::Stats*>(*/
/* SC_AM_Internal::real_malloc(sizeof(SC_AM_Internal::Stats)));*/
/* std::clog << "Initializing stats global ptr...\n";*/
/* SC_AM_Internal::stats->initialize();*/
}
return SC_AM_Internal::stats->do_free(ptr);
}
}
// vim: et sw=2 ts=2 sts=2