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undexpected modification of string array

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  undexpected modification of string array Jivanmukta <jivanmukta@poczta.onet.pl> - 2022-07-27 18:32 +0200
    Re: undexpected modification of string array Ralf Fassel <ralfixx@gmx.de> - 2022-07-27 19:20 +0200
    Re: undexpected modification of string array Paavo Helde <eesnimi@osa.pri.ee> - 2022-07-27 20:29 +0300

#85691 — undexpected modification of string array

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]?

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#85694

* Jivanmukta <jivanmukta@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'

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#85696

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

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