我已经安装了gdb 7.7
(来自 GNU 来源)在 OS X Mavericks (10.9.2) 下。我对其进行了代码签名,因此每当我调试时它都可以正常工作c++
不包含模板的文件。但是,它无法单步执行模板函数(可以单步执行常规函数,但无法单步执行模板函数)。当我打字时step
命令在调试会话中,它只是跳过该函数,就好像模板函数不存在调试符号一样。我的模板函数甚至不是成员函数,只是在main.cpp
.
我编译我的程序g++ -g -O0 main.cpp
(I use g++4.8.2
from macports
并不是clang++
),甚至尝试过-fno-inline
,仍然是相同的行为,无法进入模板函数。这是一个gdb
OS X Mavericks 下的已知问题?或者,任何人都可以重现该错误吗?
my code:
#include <iostream>
template <typename T> // template
void f(T x)
{
std::cout << "In f:" << std::endl;
std::cout << x << std::endl;
}
void g() // non-template
{
std::cout << "It works here!" << std::endl;
std::cout << "Exiting g()..." << std::endl;
}
int main()
{
f<double>(12.3); // gdb does not step into f()
g(); // gdb steps into g()
}
无法踏入f
断点后f<double>(12.3)
.
If f()
是一个常规函数,例如g()
在我的代码中,然后它进入。
谢谢!
Update: gdb
在任何其他操作系统下都可以正常工作,例如linux/windows/solaris
。这似乎是与 OS X 有关的问题。
Reading symbols from a.out...done.
(gdb) disassemble main
Dump of assembler code for function main():
0x0000000100000d62 <+0>: push %rbp
0x0000000100000d63 <+1>: mov %rsp,%rbp
0x0000000100000d66 <+4>: movabs $0x402899999999999a,%rax
0x0000000100000d70 <+14>: movq %rax,%xmm0
0x0000000100000d75 <+19>: callq 0x100000e44
0x0000000100000d7a <+24>: callq 0x100000d0c <g()>
0x0000000100000d7f <+29>: mov $0x0,%eax
0x0000000100000d84 <+34>: pop %rbp
0x0000000100000d85 <+35>: retq
End of assembler dump.
(gdb)
现在我们在入口处设置断点main()
(gdb) b main
Breakpoint 1 at 0x100000d66: file src/templated_bug.cpp, line 22.
(gdb) r
Starting program: /Users/vlad/template_gdb_bug/a.out
Breakpoint 1, main () at src/templated_bug.cpp:22
22 f<double>(12.3);
(gdb) s
In f:
12.3
23 g();
(gdb) s
g () at src/templated_bug.cpp:16
16 cout<<"It works here!"<<endl;
(gdb) s
It works here!
17 cout<<"Exiting g()..."<<endl;
(gdb) s
Exiting g()...
18 }
(gdb) s
main () at src/templated_bug.cpp:24
24 }
(gdb) s
[Inferior 1 (process 50945) exited normally]
(gdb)
正如你所看到的,它并没有进入内部f()
但走进去g()
。而且,
(gdb) disassemble f
No symbol "f" in current context.
然而,对于另一个函数g()
那是非模板,符号已加载,我可以反汇编它。
(gdb) disassemble g
Dump of assembler code for function g():
0x0000000100000d0c <+0>: push %rbp
0x0000000100000d0d <+1>: mov %rsp,%rbp
0x0000000100000d10 <+4>: lea 0x193(%rip),%rsi # 0x100000eaa
0x0000000100000d17 <+11>: mov 0x2ea(%rip),%rax # 0x100001008
0x0000000100000d1e <+18>: mov %rax,%rdi
0x0000000100000d21 <+21>: callq 0x100000e5c
0x0000000100000d26 <+26>: mov 0x2e3(%rip),%rdx # 0x100001010
0x0000000100000d2d <+33>: mov %rdx,%rsi
0x0000000100000d30 <+36>: mov %rax,%rdi
0x0000000100000d33 <+39>: callq 0x100000e4a
0x0000000100000d38 <+44>: lea 0x17a(%rip),%rsi # 0x100000eb9
0x0000000100000d3f <+51>: mov 0x2c2(%rip),%rax # 0x100001008
0x0000000100000d46 <+58>: mov %rax,%rdi
0x0000000100000d49 <+61>: callq 0x100000e5c
0x0000000100000d4e <+66>: mov 0x2bb(%rip),%rdx # 0x100001010
0x0000000100000d55 <+73>: mov %rdx,%rsi
0x0000000100000d58 <+76>: mov %rax,%rdi
0x0000000100000d5b <+79>: callq 0x100000e4a
0x0000000100000d60 <+84>: pop %rbp
0x0000000100000d61 <+85>: retq
End of assembler dump.