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gdb: make a breakpoint on a class function in c++

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1

Assume the following class:

class a 
 public:
 int getA(int a)
 return 5;
 
 int getA(int a, int b)
 return 6;
 
;

int main()
 a cA;
 std::cout << cA.getA(5) << std::endl;

 return 0;

in gdb, I can set a breakpoint on the getA function using:

b a::getA

But this only sets a b on the first function, how do I make a b on the second function (without using line number of course)

c++ gdb

share|improve this question

asked Mar 26 at 3:38

JoeJoe

822 bronze badges

add a comment | 

1

Assume the following class:

class a 
 public:
 int getA(int a)
 return 5;
 
 int getA(int a, int b)
 return 6;
 
;

int main()
 a cA;
 std::cout << cA.getA(5) << std::endl;

 return 0;

in gdb, I can set a breakpoint on the getA function using:

b a::getA

But this only sets a b on the first function, how do I make a b on the second function (without using line number of course)

c++ gdb

share|improve this question

asked Mar 26 at 3:38

JoeJoe

822 bronze badges

add a comment | 

Assume the following class:

class a 
 public:
 int getA(int a)
 return 5;
 
 int getA(int a, int b)
 return 6;
 
;

int main()
 a cA;
 std::cout << cA.getA(5) << std::endl;

 return 0;

in gdb, I can set a breakpoint on the getA function using:

b a::getA

But this only sets a b on the first function, how do I make a b on the second function (without using line number of course)

c++ gdb

share|improve this question

asked Mar 26 at 3:38

JoeJoe

822 bronze badges

class a 
 public:
 int getA(int a)
 return 5;
 
 int getA(int a, int b)
 return 6;
 
;

int main()
 a cA;
 std::cout << cA.getA(5) << std::endl;

 return 0;

b a::getA

share|improve this question

asked Mar 26 at 3:38

JoeJoe

822 bronze badges

share|improve this question

asked Mar 26 at 3:38

JoeJoe

822 bronze badges

asked Mar 26 at 3:38

JoeJoe

822 bronze badges

asked Mar 26 at 3:38

JoeJoe

822 bronze badges

2 Answers
2

active

oldest

votes

3

Add one more line to your main():

std::cout << cA.getA(2,3) << std::endl;

Now, repeat your original experiment. Your results will be different, now:

(gdb) b a::getA
Breakpoint 1 at 0x40089d: a::getA. (2 locations)

"2 locations" is gdb telling you that it now injected breakpoints for both overloaded functions. Stepping through the code will verify this.

If a symbol resolved to multiply-overloaded functions, the b command sets a breakpoint at each one.

But because the 2nd overloaded function was an inline function and it was never called in your original code, gcc didn't even compile it, and there was nothing for gdb to set a breakpoint at.

share|improve this answer

answered Mar 26 at 3:48

Sam VarshavchikSam Varshavchik

65.2k55 gold badges3939 silver badges8484 bronze badges

add a comment | 

0

b a::getA(int,int) should do the trick. Even the one that's already working should be replaceable with b a::getA(int).

Try it yourself here.

share|improve this answer

answered Mar 26 at 3:49

aepaep

67155 silver badges1414 bronze badges

add a comment | 

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3

Add one more line to your main():

std::cout << cA.getA(2,3) << std::endl;

Now, repeat your original experiment. Your results will be different, now:

(gdb) b a::getA
Breakpoint 1 at 0x40089d: a::getA. (2 locations)

"2 locations" is gdb telling you that it now injected breakpoints for both overloaded functions. Stepping through the code will verify this.

If a symbol resolved to multiply-overloaded functions, the b command sets a breakpoint at each one.

But because the 2nd overloaded function was an inline function and it was never called in your original code, gcc didn't even compile it, and there was nothing for gdb to set a breakpoint at.

share|improve this answer

answered Mar 26 at 3:48

Sam VarshavchikSam Varshavchik

65.2k55 gold badges3939 silver badges8484 bronze badges

add a comment | 

3

Add one more line to your main():

std::cout << cA.getA(2,3) << std::endl;

Now, repeat your original experiment. Your results will be different, now:

(gdb) b a::getA
Breakpoint 1 at 0x40089d: a::getA. (2 locations)

"2 locations" is gdb telling you that it now injected breakpoints for both overloaded functions. Stepping through the code will verify this.

If a symbol resolved to multiply-overloaded functions, the b command sets a breakpoint at each one.

But because the 2nd overloaded function was an inline function and it was never called in your original code, gcc didn't even compile it, and there was nothing for gdb to set a breakpoint at.

share|improve this answer

answered Mar 26 at 3:48

Sam VarshavchikSam Varshavchik

65.2k55 gold badges3939 silver badges8484 bronze badges

add a comment | 

Add one more line to your main():

std::cout << cA.getA(2,3) << std::endl;

Now, repeat your original experiment. Your results will be different, now:

(gdb) b a::getA
Breakpoint 1 at 0x40089d: a::getA. (2 locations)

"2 locations" is gdb telling you that it now injected breakpoints for both overloaded functions. Stepping through the code will verify this.

If a symbol resolved to multiply-overloaded functions, the b command sets a breakpoint at each one.

But because the 2nd overloaded function was an inline function and it was never called in your original code, gcc didn't even compile it, and there was nothing for gdb to set a breakpoint at.

share|improve this answer

answered Mar 26 at 3:48

Sam VarshavchikSam Varshavchik

65.2k55 gold badges3939 silver badges8484 bronze badges

std::cout << cA.getA(2,3) << std::endl;

(gdb) b a::getA
Breakpoint 1 at 0x40089d: a::getA. (2 locations)

share|improve this answer

answered Mar 26 at 3:48

Sam VarshavchikSam Varshavchik

65.2k55 gold badges3939 silver badges8484 bronze badges

answered Mar 26 at 3:48

Sam VarshavchikSam Varshavchik

65.2k55 gold badges3939 silver badges8484 bronze badges

answered Mar 26 at 3:48

Sam VarshavchikSam Varshavchik

65.2k55 gold badges3939 silver badges8484 bronze badges

0

b a::getA(int,int) should do the trick. Even the one that's already working should be replaceable with b a::getA(int).

Try it yourself here.

share|improve this answer

answered Mar 26 at 3:49

aepaep

67155 silver badges1414 bronze badges

add a comment | 

0

b a::getA(int,int) should do the trick. Even the one that's already working should be replaceable with b a::getA(int).

Try it yourself here.

share|improve this answer

answered Mar 26 at 3:49

aepaep

67155 silver badges1414 bronze badges

add a comment | 

b a::getA(int,int) should do the trick. Even the one that's already working should be replaceable with b a::getA(int).

Try it yourself here.

share|improve this answer

answered Mar 26 at 3:49

aepaep

67155 silver badges1414 bronze badges

share|improve this answer

answered Mar 26 at 3:49

aepaep

67155 silver badges1414 bronze badges

answered Mar 26 at 3:49

aepaep

67155 silver badges1414 bronze badges

answered Mar 26 at 3:49

aepaep

67155 silver badges1414 bronze badges