然而,在函数结束时,变量越来越有可能变成 <optimized out> ,因为由于优化,它仅存储在寄存器中,而不是堆栈上的内存中。因此,当不再需要它时,寄存器很可能会被另一个变量重用和覆盖,然后调试元数据会通知 GDB。 因此,如果您正在使用某种 反向调试,例如 Mozilla rr ,一旦您尝试一次就会一直这样做,那么一个好的选择...
并且是否有办法在gdb中检索该变量。也许吧。你总是可以通过检查反汇编和有效地逆向工程编译器执行的优化...
三，int a = 15;是局部变量，且被optimized out。编译器直接产生指令将15写入寄存器，后续引用该寄存器。
kwnames=0x0, kwargs=0x7f541805a390, kwcount=<optimized out>, kwstep=1, defs=0x0, defcount=0, kwdefs=0x0, closure=(<cell at remote 0x7f5410520408>, <cell at remote 0x7f53ed637c48>, <cell at remote 0x7f53ed6377f8
#21 0x000000000040249a in main (argc=<optimized out>, argv=<optimized out>) at /root/yinbin/gazelle_rpm_build/update_example_of_9.82.1.253_data/gitee/gazelle/examples/main.c:40 (gdb) info thread Id Target Id Frame * 1 Thread 0x7f396fdb4980 (LWP 28119) "example" 0x00007f3970c35d25 ...
Variables manually put into the section may be optimized out and their order relative to compiler generated dynamic initializers is unspecified. Compiler warning (level 1, off) C5249 'bitfield' of type 'enumeration_name' has named enumerators with values that cannot be represented in the given ...
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The final step is to build the actual interpreter, using the information collected from the instrumented one. The end result will be a Python binary that is optimized; suitable for distribution or production installation. Enabled via configure's--with-ltoflag. LTO takes advantage of the ability ...
constraint optimized constraint-based layo constraints in the tr constrictor auspex constrictor diviniloq construc for sale construct frameworks constructed area 4900 constructed integrall constructing assembly constructing complex constructingeodetic construction contract construction developm construction account constru...
If the function has local variables of types with non-trivial destructors, the exception specification actually makes the function smaller because the EH cleanups for those variables can be optimized away. The semantic effect is that an exception thrown out of a function with such an exception ...