Difference between revisions of "Debugging with Code::Blocks"

From Code::Blocks
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Breakpoints do not work in constructors or destructors. They do, however, work in routines <u>called</u> from them. This is a GDB restriction, not a bug. So you could do something like:
 
Breakpoints do not work in constructors or destructors. They do, however, work in routines <u>called</u> from them. This is a GDB restriction, not a bug. So you could do something like:
  MyClass::MyClass()
+
 
  {
 
    DebugCtorDtor();
 
    is_initialised = true;
 
  }
 
  MyClass::~MyClass()
 
  {
 
    DebugCtorDtor();
 
    is_initialised = false;
 
  }
 
  MyClass::DebugCtorDtor()
 
  {
 
    int i = 0; // Dummy
 
  }
 
 
[[Image:DbgWithCBExp.png|Debugging ctor/dtor ]]
 
[[Image:DbgWithCBExp.png|Debugging ctor/dtor ]]
...and place a breakpoint in "DebugCtorDtor" at the line "int i = 0; // Dummy". The debugger will break at that line. If you go step-wise then (Menu Debug -> Next Line; or alternatively F7) you'll reach the code in the contructor/destructor (is_initialised = true/false).
+
 
 +
...and place a breakpoint in "DebugCtorDtor" at the line "int i = 0;" . The debugger will break at that line. If you then step the debugger (Menu Debug -> Next Line; or alternatively F7) you'll reach the code in the contructor/destructor (is_initialised = true/false).
  
 
Last edited: [[User:MortenMacFly|MortenMacFly]] 02:52, 26 October 2006 (EDT)
 
Last edited: [[User:MortenMacFly|MortenMacFly]] 02:52, 26 October 2006 (EDT)

Revision as of 15:45, 30 October 2006

Make sure that the project is compiled with the -g compiler option. This ensures that the executable has debug symbols included.

Keep in mind that you may have to re-build your project as up-to-date object files might not be re-compiled with -g otherwise. Please be aware that in compilers other than GCC, this might be a different switch.

Menu => Project => Build Options Set Project Build Options


Open The Debugger Watches Window

Open Watch Window


Find the line containing the variable to be watched. Set a breakpoint in a position that will allow you to observe the variable value.

Menu => Debug => Toggle Breakpoint Choose Watch Variable

Run the debugger until the breakpoint is reached. Right click the variable to set a watch in the Watch Window.

Notes:

Breakpoints may also be toggled with a left click in the left editor margin.

Breakpoints do not work in constructors or destructors. They do, however, work in routines called from them. This is a GDB restriction, not a bug. So you could do something like:

Debugging ctor/dtor

...and place a breakpoint in "DebugCtorDtor" at the line "int i = 0;" . The debugger will break at that line. If you then step the debugger (Menu Debug -> Next Line; or alternatively F7) you'll reach the code in the contructor/destructor (is_initialised = true/false).

Last edited: MortenMacFly 02:52, 26 October 2006 (EDT)