undexpected modification of string array

[Jivanmukta]

I have object of my class source_file:

class source_file {
private:
std::wstring source_file_path;
int current_source_line_no;
bool inside_php, start_inside_php;
int num_source_lines, too_long_line_number;
std::vector<std::string> source_lines;
std::vector<std::pair<int, std::string>> tokenized_lines;
std::vector<std::pair<int, std::string>>::const_iterator
current_tokenized_lines_iter;
size_t max_line_len, too_long_line_len, max_found_line_len;
public:
source_file(size_t max_line_length = 0) { // 0 means 'no limit'
max_line_len = max_line_length;
too_long_line_len = 0;
max_found_line_len = 0;
current_source_line_no = -1;
num_source_lines = 0;
current_tokenized_lines_iter = tokenized_lines.end();
too_long_line_number = 0;
inside_php = start_inside_php = false;
}
size_t get_max_found_line_length() const {
return max_found_line_len;
}
size_t get_too_long_line_length() const {
return too_long_line_len;
}
int get_too_long_line_number() const {
return too_long_line_number;
}
bool open(std::wstring in_file_path);
void close() {
source_lines.clear();
tokenized_lines.clear();
too_long_line_len = 0;
max_found_line_len = 0;
num_source_lines = 0;
current_source_line_no = -1;
}
void rewind() { // go to begin of file
current_source_line_no = -1;
current_tokenized_lines_iter = tokenized_lines.begin();
inside_php = start_inside_php = false;
}
bool get_next_line(std::string &line);
bool change_current_line(std::string line, bool ltrim_line);
void ltrim_current_line();
void get_contents(std::vector<std::string> &contents);
bool change_file_with_contents(const std::vector<std::string>
&contents, unsigned int defines_line_num = 0, unsigned int
defines_num_lines = 0);
void remove_magic_str(); void write(std::wstring out_file_path)
const {
std::ofstream out_file(shortwstr2str(out_file_path));
for (std::string line : source_lines) {
out_file << line << std::endl;
}
}
void tokenize_file(std::string token_name_delim_str);
bool get_next_line_with_tokenized(std::string &line, std::string
&tokenized_line);
};

The problem is that in some moment of time source_lines[318] is
unexpectedly modified, I don't know why and when, although the file is
correctly loaded to source_lines[], I mean open() works fine and some
time later get_next_line() returns spoilt string. Conditional
breakpoints don't work (I use VSCodium).
How to find the moment of modification of source_line[318]?

[Ralf Fassel]

* Jivanmukta <jivan...@poczta.onet.pl>

| The problem is that in some moment of time source_lines[318] is

| unexpectedly modified, --<snip-snip>--

| How to find the moment of modification of source_line[318]?

Use valgrind or similar.

R'

[Paavo Helde]

27.07.2022 19:32 Jivanmukta kirjutas:
>
> I have object of my class source_file:

[...]

> The problem is that in some moment of time source_lines[318] is
> unexpectedly modified, I don't know why and when, although the file is
> correctly loaded to source_lines[], I mean open() works fine and some
> time later get_next_line() returns spoilt string. Conditional
> breakpoints don't work (I use VSCodium).
> How to find the moment of modification of source_line[318]?

If it is well reproducible, then a data breakpoint should work fine.
Note that hardware data breakpoints are max 4 or 8 bytes, so you will
need to figure out the exact address in the memory which will be
illegally modified, and put a data breakpoint on it.

> bool inside_php,

Last time I used PHP as an in-process library, it wrote over some random
foreign memory when initializing itself. It was a bit tricky to cope
with as I was not able to compile its sources any more :-S