Dev-c++ Breakpoints Not Working

How do I debug using Dev-C++?

  1. Data Breakpoints
  2. C++ Breakpoint In Code

First, make sure you are using a project.

In my asp.net project break points are not hitting, even I have checked all debug settings, running it into debug mode as well. When I drop a break-point on hover it shows message 'The break point will not currently be hit.No Symbols have been loaded for this document.' Thanks in Advance. Mar 15, 2011  I have an application in Visual Studio 2008. I have been working with it for some time. Today, suddenly, it will not debug, or more specifically it does not stop at the breakpoints I.


Then go to
Project Options - Compiler - Linker and set Generate debugging information to 'yes', and make sure you are not using any optimization options (they're not good for debug mode). Also check the Parameters tab, make sure you don't have any optimization options (like -O2 or -O3, but -O0 is ok because it means no optimization) or strip option (-s).
After that, do a full rebuild (Ctrl-F11), then set breakpoint(s) where you want the debugger to stop (otherwise it will just run the program). To set a breakpoint on a line, just click on the gutter (the gray band on the left), or press Ctrl-F5.

Mar 20, 2016  DEV C continue to run previous compiled file, not the current one By Davide on Tue Apr 02, 2019 06:15 PM 1. Integrated debugger is not working with devcpp 4.9.9.1. I upgraded from devcpp 4.9.9.0. When i set a breakpoint in an ordinary console mode program and start the debugger, then the console window is generated but it is not possible to debug anything. There is no response to Next Step Step into etc. The only thing which is possible is to Stop Execution. The debugger works (imperfect with. Feb 26, 2019  Figure 4: Deactivated breakpoints in the Breakpoints pane are disabled and transparent DOM change breakpoints. Use a DOM change breakpoint when you want to pause on the code that changes a DOM node or its children. To set a DOM change breakpoint: Click the Elements tab. Go the element that you want to set the breakpoint on. Right-click the element. Jul 26, 2013  I'm having problem in using breakpoint. I'm creating a website in VS2005 in ASP.Net/C# language. But the problem is i can't seem to use the breakpoint. After putting the toggle breakpoint, and i. May 22, 2010  Ah hah, that means you got the Insight setup and working properly but somehow the Dev-C does not include debugging info in your compiled exe. What version of Dev-C you got, did you go to Tools -Check for updates/packages and after you connect to the devpark.org listing, check to see in the Installed package if you have the latest ones.


Now you are ready to launch the debugger, by pressing F8 or clicking the debug button. If everything goes well, the program will start, and then stop at the first breakpoint. Then you can step through the code, entering function calls, by pressing Shift-F7 or the 'step into' button, or stepping over the function calls, by pressing F7 or the 'next step' button. You can press Ctrl-F7 or the 'continue' button to continue execution till the next breakpoint. At any time, you can add or remove breakpoints.


When the program stopped at a breakpoint and you are stepping through the code, you can display the values of various variables in your program by putting your mouse over them, or you can display variables and expressions by pressing F4 or the 'add watch' button and typing the expression.


For more information refer to the help included with Dev-C++.

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Data Breakpoints

Breakpoints that are controlled by the processor at the request of the debugger are known as processor breakpoints or data breakpoints. Breakpoints that are controlled directly by the debugger are known as software breakpoints.

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Note Although the term data breakpoint is commonly used as a synonym for processor breakpoint, this term can be misleading. There are two fundamental types of breakpoints: processor breakpoints, which are controlled by the processor, and software breakpoints, which are controlled by the debugger. Processor breakpoints are usually set on program data -- this is the reason they are called 'data breakpoints' -- but they can also be set on executable code. Software breakpoints are usually set on executable code, but they can also be set on program data. Unfortunately, it is common in debugging literature to refer to processor breakpoints as 'data breakpoints', even when they are set on executable code.

Processor Breakpoints

A processor breakpoint is triggered when a specific memory location is accessed. There are four types of processor breakpoints, corresponding to the kind of memory access that triggers it:

Breakpoint typeAction

e (execute)

Triggered when the processor retrieves an instruction from the specified address.

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r (read/write)

Triggered when the processor reads or writes memory at the specified address.

w (write)

Triggered when the processor writes memory at the specified address.

i (i/o)

Triggered when the I/O port at the specified Address is accessed.

Each processor breakpoint has a size associated with it. For example, a w (write) processor breakpoint could be set at the address 0x70001008 with a size of four bytes. This would monitor the block of addresses from 0x70001008 to 0x7000100B, inclusive. If this block of memory is written to, the breakpoint will be triggered.

It can happen that the processor performs an operation on a memory region that overlaps with, but is not identical to, the specified region. In the example given in the preceding paragraph, a single write operation that includes the range 0x70001000 to 0x7000100F, or a write operation that includes only the byte at 0x70001009, would be an overlapping operation. In such a situation, whether the breakpoint is triggered is processor-dependent. For details of how this situation is handled on a specific processor, consult the processor archictecture manual and look for 'debug register' or 'debug control register'. To take one specific processor type as an example, on an x86 processor, a read or write breakpoint is triggered whenever the accessed range overlaps the breakpoint range.

Similarly, if an e (execute) breakpoint is set on the address 0x00401003, and then a two-byte instruction spanning the addresses 0x00401002 and 0x00401003 is executed, the result is processor-dependent. Again, consult the processor architecture manual for details.

The processor distinguishes between breakpoints set by a user-mode debugger and breakpoints set by a kernel-mode debugger. A user-mode processor breakpoint does not affect any kernel-mode processes. A kernel-mode processor breakpoint might or might not affect a user-mode process, depending on whether the user-mode code is using the debug register state and whether there is a user-mode debugger that is attached.

To apply the current process' existing data breakpoints to a different register context, use the .apply_dbp (Apply Data Breakpoint to Context) command.

C++ Breakpoint In Code

On a multiprocessor computer, each processor breakpoint applies to all processors. For example, if the current processor is 3 and you use the command ba e1 MyAddress to put a breakpoint at MyAddress, any processor -- not only processor 3 -- that executes at that address triggers the breakpoint. This holds for software breakpoints as well.

Software Breakpoints

Software breakpoints, unlike processor breakpoints, are controlled by the debugger. When the debugger sets a software breakpoint at some location, it temporarily replaces the contents of that memory location with a break instruction. The debugger remembers the original contents of this location, so that if this memory is displayed in the debugger, the debugger will show the original contents of that memory location, not the break instruction. When the target process executes the code at this location, the break instruction causes the process to break into the debugger. After you have performed whatever actions you choose, you can cause the target to resume execution, and execution will resume with the instruction that was originally in that location.

Availability of Processor Breakpoint Types

On Windows Server 2003 with Service Pack 1 (SP1), on an Itanium-based computer that uses WOW64 to emulate x86, processor breakpoints do not work with the e (execute) option but they do work with the r (read/write) and w (write) options.

The i (i/o) option is available only during kernel-mode debugging, with a target computer that is running Windows XP or a later version of Windows on an x86-based processor.

Not all data sizes can be used with all processor breakpoint types. The permitted sizes depend on the processor of the target computer. For details, see ba (Break on Access).

Limitations of Software Breakpoints and Processor Breakpoints

It is possible to specify a data address rather than a program address when using the bp or bm /a commands. However, even if a data location is specified, these commands create software breakpoints, not processor breakpoints. When the debugger places a software breakpoint at some location, it temporarily replaces the contents of that memory location with a break instruction. This does not corrupt the executable image, because the debugger remembers the original contents of this location, and when the target process attempts to execute this code the debugger can respond appropriately. But when a software breakpoint is set in a data location, the resulting overwrite can lead to data corruption. Therefore, setting a software breakpoint on a data location is safe only if you are certain that this location will be used only as executable code.

The bp, bu, and bm commands set software breakpoints by replacing the processor instruction with a break instruction. Therefore these cannot be used in read-only code or any other code that cannot be overwritten. To set a breakpoint in such code, you must use ba (Break on Access) with the e (execute) option.

You cannot create multiple processor breakpoints at the same address that differ only in the command that is automatically executed when the breakpoint is triggered. However, you can create multiple breakpoints at the same address that differ in their other restrictions (for example, you can create multiple breakpoints at the same address by using the ba command with different values of the /p, /t, /c, and /C options).

The initial breakpoint in a user-mode process (typically set on the main function or its equivalent) cannot be a processor breakpoint.

The number of processor breakpoints that are supported depends on the target processor architecture.

Controlling Software Breakpoints and Processor Breakpoints

Software breakpoints can be created with the bp (Set Breakpoint), bm (Set Symbol Breakpoint), and bu (Set Unresolved Breakpoint) commands. Processor breakpoints can be created with the ba (Break on Access) command. Commands that disable, enable, and modify breakpoints apply to all kinds of breakpoints. Commands that display a list of breakpoints include all breakpoints, and indicate the type of each. For a listing of these commands, see Methods of Controlling Breakpoints.

The WinDbg Breakpoints dialog box displays all breakpoints, indicating processor breakpoints with the notation 'e', 'r', 'w', or 'i' followed by the size of the block. This dialog box can be used to modify any breakpoint. The Command text box on this dialog box can be used to create any type of breakpoint.If a processor breakpoint is desired, begin the input with 'ba'. For details, see Edit Breakpoints. When you set a breakpoint by using the mouse in the WinDbg Disassembly window or Source window, the debugger creates an unresolved software breakpoint.

Processor breakpoints are stored in the processor's debug registers. It is possible to set a breakpoint by manually editing a debug register value, but this is strongly discouraged.