SPNU151 User guide

SPNU151W January 1998 – March 2023 66AK2E05 , 66AK2H06 , 66AK2H12 , 66AK2H14 , AM1705 , AM1707 , AM1802 , AM1806 , AM1808 , AM1810 , AM5K2E04 , OMAP-L132 , OMAP-L137 , OMAP-L138 , SM470R1B1M-HT , TMS470R1A288 , TMS470R1A384 , TMS470R1A64 , TMS470R1B1M , TMS470R1B512 , TMS470R1B768

8.2 Sample Usage of the C++ Name Demangler

The examples in this section illustrate the demangling process.

This example shows a sample C++ program. In this example, the linknames of all the functions are mangled; that is, their signature information is encoded into their names.

class banana {
public:
    int calories(void);
    banana();
    ~banana();
};
int calories_in_a_banana(void)
{
    banana x;
    return x.calories();
}

The resulting assembly that is output by the compiler is as follows.

_Z20calories_in_a_bananav:
        STMFD     SP!, {A3, A4, V1, LR}
        MOV       A1, SP
        BL        _ZN6bananaC1Ev
        BL        _ZN6banana8caloriesEv
        MOV       V1, A1
        MOV       A1, SP
        BL        _ZN6bananaD1Ev
        MOV       A1, V1
        LDMFD     SP!, {A3, A4, V1, LR}
        BX        LR

Executing the C++ name demangler will demangle all names that it believes to be mangled. Enter:

armdem calories_in_a_banana.asm

The result after running the C++ name demangler is as follows. The linknames in _ZN6bananaC1Ev, _ZN6banana8caloriesEv, and _ZN6bananaD1Ev are demangled.

calories_in_a_banana():
        STMFD     SP!, {A3, A4, V1, LR}
        MOV       A1, SP
        BL        banana::banana()
        BL        banana::calories()
        MOV       V1, A1
        MOV       A1, SP
        BL        banana::~banana()
        MOV       A1, V1
        LDMFD     SP!, {A3, A4, V1, LR}
        BX        LR