GDB条件断点语法错误

Question

I am trying to figure out why my C++ program is failing an assertion. I want to analyze the current variable values at the time of the failure, but the program exits when the assertion fails and so the scope is lost. I therefore want to set a conditional breakpoint with the assertion condition negated. The assertion looks like this:

assert( AddrRange(pkt->getAddr(), 
                  pkt->getAddr() + pkt->getSize() - 1).isSubset(range) );

In GDB, I do:

break filename.cc:linenum if (AddrRange(pkt->getAddr(), pkt->getAddr() + pkt->getSize() - 1).isSubset(range) == false )

but this results in:

A syntax error in expression, near `pkt->getAddr(), pkt->getAddr() + pkt->getSize() - 1).isSubset(range) == false )'.

I tried creating the breakpoint first and then using cond, but I get the same syntax error. What am I doing wrong?

Answer 1

我最终修改了代码，并将函数调用返回值保存到bool中，然后使用bool变量创建了条件断点。