compiler-rt/test/profile/instrprof-discarded-comdat.cpp

   1 // Check that instrprof does not introduce references to discarded sections when
   2 // using comdats.
   3 //
   4 // Occasionally, it is possible that the same function can be compiled in
   5 // different TUs with slightly different linkages, e.g., due to different
   6 // compiler options. However, if these are comdat functions, a single
   7 // implementation will be chosen at link time. we want to ensure that the
   8 // profiling data does not contain a reference to the discarded section.
   9
  10 // UNSUPPORTED: target={{.*windows.*}}
  11
  12 // RUN: mkdir -p %t.d
  13 // RUN: %clangxx_pgogen -O2 -fPIC -ffunction-sections -fdata-sections -c %s -o %t.d/a1.o -DOBJECT_1 -mllvm -disable-preinline
  14 // RUN: %clangxx_pgogen -O2 -fPIC -ffunction-sections -fdata-sections -c %s -o %t.d/a2.o
  15 // RUN: %clangxx_pgogen -fPIC -shared -o %t.d/liba.so %t.d/a1.o %t.d/a2.o 2>&1 | FileCheck %s --allow-empty
  16
  17 // Ensure that we don't get an error when linking
  18 // CHECK-NOT: relocation refers to a discarded section: .text._ZN1CIiE1fEi
  19
  20 template <typename T> struct C {
  21   void f(T x);
  22   int g(T x) {
  23     f(x);
  24     return v;
  25   }
  26   int v;
  27 };
  28
  29 template <typename T>
  30 #ifdef OBJECT_1
  31 __attribute__((weak))
  32 #else
  33 __attribute__((noinline))
  34 #endif
  35 void C<T>::f(T x) {
  36   v += x;
  37 }
  38
  39 #ifdef OBJECT_1
  40 int foo() {
  41   C<int> c;
  42   c.f(1);
  43   return c.g(2);
  44 }
  45 #else
  46 int bar() {
  47   C<int> c;
  48   c.f(3);
  49   return c.g(4);
  50 }
  51 #endif