[C/C ++] GDB Reading Notes (resend)

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Understanding the basic commands can give developers a better understanding of the debugger than fully packaged by IDE, so I will post an article.

 

Breakpoint commands:
Awatch is used to set an observation point for an expression. When the expression value changes, or when the expression value
When the program is deprecated, it stops running.
Format: Specifies the expression of the observation point for awatch.
Break is used to set breakpoints.
Format: The line number of the breakpoint to be set for the break.
Clear the breakpoint.
Format: The line number of the breakpoint to be clear
Commands is set to execute specific commands after a breakpoint occurs.
Format: commands breakpoint number.
Condition sets a breakpoint on the specified row only when certain conditions are met.
Format: Conditional breakpoint number condition expression
Delete indicates the breakpoint or automatically displayed expression.
Format: Number or expression of the delete breakpoint
Disable temporarily invalidates the breakpoint.
Format: Disable breakpoint number
Enable resumes temporarily invalid breakpoints.
Format: Enable breakpoint number
Ignore ignores breakpoints set by users within a certain range.
Format: Ignore n cont
Set a temporary breakpoint for tbreak. Function once.
Format: tbreak: Set the line number of a temporary breakpoint
Watch sets an observation point for an expression. When the expression value changes, the program stops running.
Format: Expression of the observation point to be set for watch
Data commands:
Display is used to display the values of some expressions.
Format: Expression of the value to be displayed in display
Info display displays information about all worthwhile expressions.
Format: info display
Delete display deletes a worthwhile expression to be displayed.
Format: delete display: Delete the number of the displayed expression
Disable display temporarily shields expressions that do not need to be displayed.
Format: disalbe display: Number of the expression that is blocked
Enable display enables the expression with the displayed value blocked to resume display.
Format: Number of the expression to be displayed for enable display
Undisplay ends the display of an expression value.
Format: undisplay expressions that do not need to display the value
Whatis displays the data type of an expression.
Format: whatis expression of the query type
Print print expression value. It can also be used to print the content of a region starting from a variable in the memory.
Format: expression to be printed for print
Ptype is used to define the type.
Format: ptype Parameter
Set is used to assign values to variables.
Format: Set variable = expression
File commands:
Add-shared-symbol-files is used to load the symbol table from the shared target file of the dynamic connection ing.
Add-symbol-file is used to load the symbol table from a file that has been dynamically loaded.
Format: Add-symbol-file ADDR
CD is used to change the current working directory.
Core-file makes a file a core dump, which can check the memory and registers.
Directory is used to add a directory to the source file search path.
Format: directory to be added
The file command is used to mount the program to be debugged.
Format: name of the file to be loaded
List is used to list object content.
The list command can use the following non-empty parameters:
Linenum: linenum row of the current file;
File: linenum: Specifies the linenum row of the file;
Function: the function of the current file;
File: function: Specifies the function of a file;
* Address: list the files containing this address.
Format: start line number of the List
Forward is used to search for the first program row that matches a string from the current row in the list.
Format: string to be matched by forward
Load is used to dynamically load files into the program being debugged, record its symbol table, and prepare the connection.
Format: name of the file to be loaded by load
PATH is used to add a directory to the search path of the target file.
Format: directory name to be added to the search path
Reverse-search searches for the first program row that matches a string from the current row in the list.
The usage of the search and forward commands is exactly the same.
Command for running the program:
Cont enables the program to run after the word signal occurs or stops at the breakpoint.
Handle is used to set the processing function for the signal.
Format: handle Signal Processing
Jump is used to specify the instruction or address for the program to start debugging.
Format: Jump line number or command address
Kill is used to end debugging of the current program.
Format: Kill
Next is used to continue running the program. It is called beyond the subroutine.
Format: Next N or null
Nexti is used to execute an instruction in one step.
Step is used to execute a statement. Instead of calling a subroutine, it traces the subprogram.
Stepi is used to execute an instruction. It does not go beyond the calling of the subprogram, But traces to the subprogram.
Stack commands:
Backtrace is used to print the stack trim (stack frame) pointer. Its format and functions are identical to those of commands.
.
Format: Number of stack history pointers to be printed by backtrace
Frame is used to print the stack metadata.
Format: Number of the stack marker to be printed by the frame
Select-frame is used to specify the number of stack shards to be selected.
I learned/reviewed the command summary written during GDB... I hope to help you.
Written by choatrue