You can set a conditional breakpoint using the context menu (see above), or by highlighting the line you want to break at in the source pane and pressing Ctrl + Shift + B (Windows/Linux) or Cmd + Shift + B (macOS). Conditional breakpoints ¶Ī conditional breakpoint is one where the code will pause execution when it is reached, only if a certain condition is met, such a variable having a certain value at the time. These are called column breakpoints, and allow you to set the breakpoint to happen exactly on any one of the function calls in the line (or multiple calls), by clicking on each relevant one.

In addition, if the line contains multiple function calls, each one will be given a small blue arrow icon to the left of it. Highlighting the line you want to break at in the source pane and pressing Ctrl + B (Windows/Linux) or Cmd + B (macOS). You can set an unconditional breakpoint using the context menu (see above), or by:Ĭlicking on the line number for the line you want to break at in the source pane. In the source pane, you can handle setting breakpoints by bringing up the context menu over a line number.Īdd breakpoint: Add a standard unconditional breakpoint at this line number (see below).Īdd condition: Add a condition and create a conditional breakpoint (see below).Īdd log: Add a log point, which logs a value to your console rather than pausing execution as a breakpoint does.Ĭontinue to here: When stepping through code, this option tells the debugging to continue execution through to this point.Īn unconditional breakpoint is one where the code will always pause execution when it is reached. At this point you can do useful things like studying the value of different variables at that point, allowing you to work out why a problem is occurring. Breakpoints in brief ¶īreakpoints are very useful when debugging JavaScript - you basically set a point in your code where you would like execution of the code to pause. There are many different types of breakpoint that can be set in the debugger this article covers standard (unconditional) breakpoints and conditional breakpoints. Turning on Firefox tests for a new configuration.Getting Set Up To Work On The Firefox Codebase.Is there any way to place breakpoints on the 32-bit code? In other words, the 32-bit code was executed. And the status of debugger changed to 'Running' automatically. But the cursor remained on 'call far ptr pm32_init'. After then, I expetecd that the cursor was on 'jc report_error'. Whan debugger's cursor is on 'call far ptr pm32_init', I clicked 'F10' key. The following is some code of dos32.asm of DOS32A ver.7.35.Ĭall far ptr pm32_init enter Protected Mode After then, the status of DOSBox debugger is changed from 'debug mode' to 'Running mode'. But at line no.222 of dos32.asm file(you can see assembly code 'call far ptr pm32_init' on dos32.asm file at line 222.), I clicked 'F10' key. I was happy! So I clicked 'F10' key to run step-by-step. It is exactly same as dos32.asm file which is included in DOS32A source code. On 'Code Overview' of DOSBox debug window, DOS32A code is shown. After then, I executed the EXE file on DOSBox debug mode using command 'debug '. I made the EXE file, which I want to explore, to use DOS32A instead of DOS4GW. Because DOS32A is open source, so I can see DOS32A internal. I expected that DOS32A helps me to how to do it. As you know, DOS32A is complete alternative of DOS4GW. To try to solve this problem, I tried to use DOS32A instead of DOS4GW. But I don't know how to place breakpoints on 32-bit stub. It is possible and easy to place breakpoints on 16-bit DOS stub. Of course the LE part contains the application code! But I can't find how to do it on DOSBox debugger.Īs you know, DOS4GW bound EXE file consists of two parts: a 16-bit DOS stub that executes dos4gw.exe, and 32-bit LE(Linear Executable) that is loaded by the dos4gw.exe loader. So I want to place breakpoints on 32-bit code of DOS4GW bound EXE. I want to explore the internal of a certain DOS4GW bound executable file.

Dosbox debugger set entry breakpoint