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Output formats (debugging with gdb)by default, gdb prints a value according to its data type Segfault) gabrielle singh cadieux, 2017 Sometimes this is not what you want
For example, you might want to print a number in hex, or a pointer in decimal Examining the stack backtrace display the current call stack (can be used after a runtime error, eg Or you might want to view data in memory at a certain address as a character string or as an instruction
To do these things, specify an output format when you print a value.
Type apropos word to search for commands related to word.reading symbols from assign1.done (gdb) you can now type debugger commands at the gdb prompt Some of the most commonly used gdb commands are listed on the next two pages This list is not exhaustive, and there are many other commands and options available.
In word, it is possible to paste code that uses color to differentiate comments from code using paste keep source formatting. however, if you use the pasted code to create a new style, word automatically strips the color coded text and changes them to be black (or whatever the auto default color is). Display/format <what> like „print“, but print the information after each stepping instruction. If you edit your program while it is being run in gdb, open another terminal, recompile your program, and restart it in gdb by typing run (args) Gdb will load the new version of the program while maintaining all of your previous breakpoints.
Print as an address, both absolute in hexadecimal and as an offset from the nearest preceding symbol
You can use this format used to discover where (in what function) an unknown address is located (gdb) p/a 0x54320 $3 = 0x54320 <_initialize_vx+396> This page explains the x command The x command displays the memory contents at a given address using the specified format.
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