breakpoints

问题 My high-level goal is something like this: void print_backtrace() { void *callstack[128]; int framesC = backtrace(callstack, sizeof(callstack)); printf("backtrace() returned %d addresses\n", framesC); char** strs = backtrace_symbols(callstack, framesC); for(int i = 0; i < framesC; ++i) { if(strs[i]) printf("%s\n", strs[i]); else break; } free(strs); } install_breakpoint_handler("__NSAutoreleaseNoPool", print_backtrace); So, each time the __NSAutoreleaseNoPool function breakpoint is catched,

问题 Cannot break out of while loop in python: I tried merging the code all together with no main and getheight functions, and it still gives me an infinite loop. def main(): x = 0 while x not in range (1,23): getheight() if x in range (1,23): break for i in range (x): for j in range (x - j): print (" ", end="") for j in range (x): print ("#", end="") print (" ", end="") for j in range (x): print ("#", end="") "\n" def getheight(): x = input("Give me a positive integer no more than 23 \n") return

问题 I've added a DOM breakpoint for "subtree modification" to the body element. When I remove the DOM Breakpoint via "Remove breakpoint" or "Remove all DOM breakpoints" and reload the page the DOM breakpoint is there again. Is there another way to remove the DOM breakpoints? Just for the record: This happens only for "subtree modifications" breakpoints. "node removal" or "attribute modifications" work. 回答1: I had the same problem plaguing me for weeks. None of the answers on SO are correct (the

问题 Need to debug a JAR file "ProA", so import the source code in the project, but there is a strange error in Eclipse while trying to set a breakpoint. Detail as below: Unable to install breakpoint due to missing line number attributes. Modify compiler options to generate line number attributes. I have try to several method to solve, but failed. Under Window > Preferences: Java > Compiler > Classfile Generation , all options have to be to True In .settings folder of your project, look for a file

问题 what is the difference between break *main and break main() in essence? for example: #include <iostream> using namespace std; int main() { int x=30; int y=40; x=y; return 0; } when I use break *main and watch x , it is this: (gdb) b *main Breakpoint 1 at 0x400674: file aa.cpp, line 4. (gdb) r Starting program: /root/dd/aa.out Breakpoint 1, main () at aa.cpp:4 4 { (gdb) n 5 int x=30; (gdb) watch x Hardware watchpoint 2: x (gdb) c Continuing. Hardware watchpoint 2: x Old value = 0 New value =

问题 I have an application that throws many (handled) exceptions. There is one type of exception in particular that I would like to break on. Is it possible to make the debugger break on a specific user-defined exception? I don't see why this wouldn't be possible, since it does know the type of the exception that was thrown. I can work around this by setting a breakpoint in the exception's constructor, but it would be nice to know how to do it the 'correct' way. 回答1: If you go to the Debug menu

问题 I have been working on an App today and have been able to debug it. All of the sudden I can't use breakpoints without Xcode 5.1 crashing. It will stop on the breakpoint, look like it's trying to display the local variables in the bottom left window, and then crash. This is the crash report: Process: Xcode [8084] Path: /Applications/Xcode.app/Contents/MacOS/Xcode Identifier: com.apple.dt.Xcode Version: 5.1 (5084) Build Info: IDEFrameworks-5084000000000000~21 App Item ID: 497799835 App External

问题 anisha@linux-dopx:~> g++ -Wall -pedantic breakpoints.cpp -g anisha@linux-dopx:~> gdb a.out (gdb) b X::X Breakpoint 1 at 0x400ac1: file breakpoints.cpp, line 14. Breakpoint 2 at 0x400aa0: file breakpoints.cpp, line 9. warning: Multiple breakpoints were set. Use the "delete" command to delete unwanted breakpoints. (gdb) What is the way to set the breakpoint on the default constructor, such that GDB doesn't create unnecessary breakpoints on the its overloaded counterparts? Or is it a problem

问题 Just recently Xcode 4 has stopped breaking on exceptions. Every exception causes the debugger to stop at UIApplicationMain with no stack trace. I have a breakpoint set on objc_exception_throw (confirmed by GDB logs) Breakpoints are turned on (confirmed by GDB and other breakpoints work fine) LLVM GCC 4.2 is my compiler Enable Objective-C Exceptions is turned on Are there any reasons breakpoints may not be working? Any flags I'm missing? 回答1: In Xcode 4, you add the breakpoint for exceptions

问题 Sorry for the strange name of my question. I don't know how to look for this because I don't know how these things are called. There's a features in Visual Studio at least where you can click on the left of the code and set a starting point which is a big red dot. Then you run the program and you can trace the steps by pressing f8 or f5 (different f's really) and you see the variable values on each step etc. I find it extremely useful because I can see where an error occurs and how the