Date: 2026-05-01T06:12:05+00:00

Actual source code: demangle.c

      1: #define PETSC_DESIRE_FEATURE_TEST_MACROS /* for and RTLD_* */
      2: #include <petsc/private/petscimpl.h>

      4: #if defined(PETSC_HAVE_DLFCN_H)
      5:   #include <dlfcn.h>
      6: #endif

      8: #if defined(__cplusplus) && defined(PETSC_HAVE_CXXABI_H)
      9:   #include <cxxabi.h>
     10: #endif

     12: PetscErrorCode PetscDemangleSymbol(const char mangledName[], char **name)
     13: {
     14:   char *(*cxa_demangle)(const char *, char *, size_t *, int *) = PETSC_NULLPTR;
     15:   char *newname;
     16:   int   status;

     18:   PetscFunctionBegin;
     19:   if (mangledName) PetscAssertPointer(mangledName, 1);
     20:   PetscAssertPointer(name, 2);

     22:   *name = PETSC_NULLPTR;
     23:   if (!mangledName) PetscFunctionReturn(PETSC_SUCCESS);

     25: #if defined(__cplusplus) && defined(PETSC_HAVE_CXXABI_H)
     26:   cxa_demangle = __cxxabiv1::__cxa_demangle;
     27: #endif

     29: #if defined(PETSC_HAVE_DLFCN_H) && defined(PETSC_HAVE_DLOPEN)
     30:   if (!cxa_demangle) {
     31:     void *symbol = PETSC_NULLPTR;
     32:   #if defined(PETSC_HAVE_RTLD_DEFAULT)
     33:     symbol = dlsym(RTLD_DEFAULT, "__cxa_demangle");
     34:   #endif
     35:     if (!symbol) {
     36:       int   mode   = 0;
     37:       void *handle = PETSC_NULLPTR;
     38:   #if defined(PETSC_HAVE_RTLD_LAZY)
     39:       mode |= RTLD_LAZY;
     40:   #endif
     41:   #if defined(PETSC_HAVE_RTLD_LOCAL)
     42:       mode |= RTLD_LOCAL;
     43:   #endif
     44:   #if defined(PETSC_HAVE_RTLD_NOLOAD)
     45:       mode |= RTLD_NOLOAD;
     46:   #endif
     47:   #ifdef __APPLE__
     48:       if (!handle) handle = dlopen("libc++.1.dylib", mode);
     49:   #else
     50:       if (!handle) handle = dlopen("libstdc++.so.6", mode);
     51:   #endif
     52:       if (handle) {
     53:         symbol = dlsym(handle, "__cxa_demangle");
     54:         dlclose(handle);
     55:       }
     56:     }
     57:     *(void **)(&cxa_demangle) = symbol;
     58:   }
     59: #endif

     61:   if (!cxa_demangle) {
     62:     PetscCall(PetscStrallocpy(mangledName, name));
     63:     PetscFunctionReturn(PETSC_SUCCESS);
     64:   }

     66:   newname = cxa_demangle(mangledName, PETSC_NULLPTR, PETSC_NULLPTR, &status);
     67:   if (status) {
     68:     PetscCheck(status != -1, PETSC_COMM_SELF, PETSC_ERR_MEM, "Failed to allocate memory for symbol %s", mangledName);
     69:     PetscCheck(status == -2, PETSC_COMM_SELF, PETSC_ERR_LIB, "Demangling failed for symbol %s", mangledName);
     70:     /* Mangled name is not a valid name under the C++ ABI mangling rules */
     71:     PetscCall(PetscStrallocpy(mangledName, name));
     72:     PetscFunctionReturn(PETSC_SUCCESS);
     73:   }
     74:   PetscCall(PetscStrallocpy(newname, name));
     75:   free(newname);
     76:   PetscFunctionReturn(PETSC_SUCCESS);
     77: }