Hi,
I compile a .cpp with cmd:
clang++ -emit-llvm -c -g -O0 -w pbzip2.cpp -o pbzip2.bc -lbz2
llvm-dis pbzip2.bc
One function in .cpp is consumer_decompress. However, I look inside
pbzip2.ll. The function name is changed to "define i8*
@_Z19consumer_decompressPv(i8* %q) #0 {"
Why clang adds a "_Z19" prefix and "Pv" suffix?
Thanks,
On 3/1/15 11:38 PM, Haopeng Liu wrote:> Hi, > > I compile a .cpp with cmd: > clang++ -emit-llvm -c -g -O0 -w pbzip2.cpp -o pbzip2.bc -lbz2 > llvm-dis pbzip2.bc > > One function in .cpp is consumer_decompress. However, I look inside > pbzip2.ll. The function name is changed to "define i8* > @_Z19consumer_decompressPv(i8* %q) #0 {" > > Why clang adds a "_Z19" prefix and "Pv" suffix?Clang mangles the name so that the function's name encodes the name and the function's type; this helps the linker link C++ object files together correctly. See http://en.wikipedia.org/wiki/Name_mangling#Name_mangling_in_C.2B.2B for more details. Regards, John Criswell> > Thanks, > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev-- John Criswell Assistant Professor Department of Computer Science, University of Rochester http://www.cs.rochester.edu/u/criswell
Got it, thanks. But in my pass, I use function name to locate. Can I disable mangling in clang? Best, Haopeng On 3/1/15 10:44 PM, John Criswell wrote:> On 3/1/15 11:38 PM, Haopeng Liu wrote: >> Hi, >> >> I compile a .cpp with cmd: >> clang++ -emit-llvm -c -g -O0 -w pbzip2.cpp -o pbzip2.bc -lbz2 >> llvm-dis pbzip2.bc >> >> One function in .cpp is consumer_decompress. However, I look inside >> pbzip2.ll. The function name is changed to "define i8* >> @_Z19consumer_decompressPv(i8* %q) #0 {" >> >> Why clang adds a "_Z19" prefix and "Pv" suffix? > > Clang mangles the name so that the function's name encodes the name > and the function's type; this helps the linker link C++ object files > together correctly. See > http://en.wikipedia.org/wiki/Name_mangling#Name_mangling_in_C.2B.2B > for more details. > > Regards, > > John Criswell > >> >> Thanks, >> _______________________________________________ >> LLVM Developers mailing list >> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu >> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev > >