Getting mangled name from demangled name

Question

Is there any way to get back the mangled name from demangled name in g++.

For example , I have the demangled name func(char*, int), what should I do to get the mangled name i.e _Z4funcPci back?

My question is g++ specific.

Answer 1

You can simply use g++ to compile an empty function with the signature you require and extract the name from that. For example:

echo "int f1(char *, int) {} " | g++ -x c++ -S - -o- | grep "^_.*:$" | sed -e 's/:$//' 

gives output

_Z2f1Pci 

which is I think what you require. Make sure that you include any relevant header files as they will affect the way the symbols are mangled.

Answer 2

Based on the Bojan Nikolic's approach, here's a better script:

mangle.bash:

IFS='::' read -a array <<< "$1"  indexes=("${!array[@]}")  prefix="" middle="" suffix="" rettype="" if [ -z "$2" ]; then     rettype="void" fi   for index in "${indexes[@]}" do     #echo "$index ${array[index]}"     if [ $index == ${indexes[-1]} ]; then     #echo "last"     middle="$rettype ${array[index]};"     elif [ -n "${array[index]}" ]; then     #echo "not empty"     prefix="${prefix}struct ${array[index]}{"     suffix="${suffix}};"     fi done  #echo "$prefix$middle$suffix $rettype $1{}" echo "$prefix$middle$suffix $rettype $1{}" | g++ -x c++ -S - -o- | grep "^_.*:$" | sed -e 's/:$//' 

Use:

$ ./mangle.bash "abc::def::ghi()" _ZN3abc3def3ghiEv $ ./mangle.bash "abc::def::ghi(int i, char c)" _ZN3abc3def3ghiEic $ ./mangle.bash "abc::def::def(int i, char c)" constr _ZN3abc3defC2Eic $ ./mangle.bash "abc::def::~def()" destr _ZN3abc3defD2Ev 

But as to constructors and destructors, remember that there are C0 C1 C2 and D0 D1 D2 ones.