breakpoints

问题 What happens if I breakpoint a multi thread application. does it stop all the threads, just the one that is break pointed or does the whole program just crash ? If it is possible would I want to stop just one thread or would this mess up my application ? If I cannot break point a multi tread application what are the debug techniques available to me ? 回答1: It stops all threads. It is not normally possible to just stop one thread. For more information on debugging threads with GDB see this part

问题 I have a habit of beginning all my MATLAB scripts with clear all; close all; clc . While it has been a very useful line, as soon as it executes, it wipes out all my breakpoints. Is there a simple way to avoid that? 回答1: I have solved this issue by creating a script that saves and reloads breakpoints. For convenience, you can even put it into a shortcut. %# store breakpoints tmp = dbstatus; save('tmp.mat','tmp') %# clear all close all clear classes %# clears even more than clear all clc %#

问题 I need to run a function line-by-line to understand how it works. But the function is part of an installed package and I don't know where R stores the source of the installed packages (say MultiPhen). I am using RStudio 0.98.501 and R 3.0.2 in Ubuntu 12 (64it). Apparently source code of installed packages are not stored, right? Sorry if it is a naive question, I am new to R. If the sources are not stored, is there anyway to re-install a package with source and debug it (basically place a

问题 I'd like to create a breakpoint such that it will create another one-time breakpoint that will 'dd' a certain memory address when that memory is written to. So when the breakpoint is hit, I'd like to run a command like: ba w4 @ESP+4 /1 ''dd [memory address of this breakpoint]'' Since this breakpoint is being created by another breakpoint (and could potentially be called several times), I can't specify the breakpoint number. Otherwise I could use a pseudo register like '$bp3' to get the memory

问题 I want to put a conditional breakpoint in windbg. For example lets say LoadLibrary API. How can I put breakpoint such that it should it whenever user32.dll get loaded. > x kernel32!LoadLibraryW It will give some address [XXXX] Now I can put breakpoint as > bu [XXXX] but this will hit for all calls to LoadLibraryW. Any suggestions. 回答1: you can not set a conditional breakpoint on a user32.dll since it's being mapped into the address space relatively early and the initial debugger's breakpoint

问题 I tried to make breakpoint in the class from JRE System Library, but when I started debug I recieved message: "Unable to install breakpoint at ... due to missing line number attributes. Modify compiler options to generate line number attributes." So what should I do: recompile JRE System Library from sources with debug information and use it? Or there is some more simple way? 回答1: So, the most simple way - to use JDK instead of JRE. In this case we can use breakpoints in system library. BUT

问题 Some part of a big code base is printing out weird NSLog statements, and I'm trying to detect where it's coming from. Is there a way to put 1 breakpoint at the start of every NSLog call so I can see where it's being called from, rather than manually have to put breakpoints on all places that call NSLog ? 回答1: In Xcode 6 : Step 1 : On the Navigator on the left, go to Breakpoint Navigator ( command ⌘ + 7 ): Step 2 : Click the + button on the bottom left ( Add a new breakpoint ), then choose Add

问题 This has been happening increasingly, when I have a sheets.add or sheets.delete in excel VBA. After searching and searching I finally found the official Microsoft support page on it. My question is, does anyone know why I could have stepped through this code just fine over and over, and then all of a sudden it starts doing what Microsoft says it would always do, and is there a way to fix it? Sub foo() Sheets.add debug.print "sheet added" 'breakpoint here End sub It's as simple as that. You

问题 Using Qt Creator, Qt 5.3, VC12 (VS2013) When I set a "Break when c++ exception is thrown" breakpoint in Qt creator, my application becomes extremely slow. Maybe 5-10 slower than running with other breakpoints such as "File name and line number" Why is debugging with this kind of breakpoint so slow? Just curious .. -- Edit -- As of CR's comment, do I face an abnormality on my system? 回答1: It is a problem with the Microsoft-provided debugger that you have downloaded to use with Qt Creator. The

问题 Using Qt Creator, Qt 5.3, VC12 (VS2013) When I set a "Break when c++ exception is thrown" breakpoint in Qt creator, my application becomes extremely slow. Maybe 5-10 slower than running with other breakpoints such as "File name and line number" Why is debugging with this kind of breakpoint so slow? Just curious .. -- Edit -- As of CR's comment, do I face an abnormality on my system? 回答1: It is a problem with the Microsoft-provided debugger that you have downloaded to use with Qt Creator. The