compiler-rt/test/profile/instrprof-without-libc.c

   1 // RUN: %clang_profgen -DCHECK_SYMBOLS -O3 -o %t.symbols %s
   2 // RUN: llvm-nm %t.symbols | FileCheck %s --check-prefix=CHECK-SYMBOLS
   3 // RUN: %clang_profgen -O3 -o %t %s
   4 // RUN: %run %t %t.profraw
   5 // RUN: llvm-profdata merge -o %t.profdata %t.profraw
   6 // RUN: %clang_profuse=%t.profdata -o - -S -emit-llvm %s | FileCheck %s
   7
   8 // This usage of llvm-nm assumes executables have symbol tables. They do not in
   9 // an MSVC environment, so we can't make this test portable.
  10 // UNSUPPORTED: msvc
  11
  12 #include <stdint.h>
  13 #include <stdlib.h>
  14
  15 #ifndef CHECK_SYMBOLS
  16 #include <stdio.h>
  17 #endif
  18
  19 int __llvm_profile_runtime = 0;
  20 uint64_t __llvm_profile_get_size_for_buffer(void);
  21 int __llvm_profile_write_buffer(char *);
  22 void __llvm_profile_merge_from_buffer(const char *, uint64_t Size);
  23
  24 int write_buffer(uint64_t, const char *);
  25 int main(int argc, const char *argv[]) {
  26   // CHECK-LABEL: define {{.*}} @main(
  27   // CHECK: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}, !prof ![[PD1:[0-9]+]]
  28   if (argc < 2)
  29     return 1;
  30
  31   const uint64_t MaxSize = 10000;
  32   static char Buffer[MaxSize];
  33
  34   uint64_t Size = __llvm_profile_get_size_for_buffer();
  35   if (Size > MaxSize)
  36     return 1;
  37   int Write = __llvm_profile_write_buffer(Buffer);
  38   if (Write)
  39     return Write;
  40
  41 #ifdef CHECK_SYMBOLS
  42   // Don't write it out.  Since we're checking the symbols, we don't have libc
  43   // available.
  44   // Call merge function to make sure it does not bring in libc deps:
  45   __llvm_profile_merge_from_buffer(Buffer, Size);
  46   return 0;
  47 #else
  48   // Actually write it out so we can FileCheck the output.
  49   FILE *File = fopen(argv[1], "w");
  50   if (!File)
  51     return 1;
  52   if (fwrite(Buffer, 1, Size, File) != Size)
  53     return 1;
  54   return fclose(File);
  55 #endif
  56 }
  57 // CHECK: ![[PD1]] = !{!"branch_weights", i32 1, i32 2}
  58
  59 // CHECK-SYMBOLS-NOT: {{ }}___cxx_global_var_init
  60 // CHECK-SYMBOLS-NOT: {{ }}___llvm_profile_register_write_file_atexit
  61 // CHECK-SYMBOLS-NOT: {{ }}___llvm_profile_set_filename
  62 // CHECK-SYMBOLS-NOT: {{ }}___llvm_profile_write_file
  63 // CHECK-SYMBOLS-NOT: {{ }}_fdopen
  64 // CHECK-SYMBOLS-NOT: {{ }}_fopen
  65 // CHECK-SYMBOLS-NOT: {{ }}_fwrite
  66 // CHECK-SYMBOLS-NOT: {{ }}_getenv
  67 // CHECK-SYMBOLS-NOT: {{ }}getenv
  68 // CHECK-SYMBOLS-NOT: {{ }}_malloc
  69 // CHECK-SYMBOLS-NOT: {{ }}malloc
  70 // CHECK-SYMBOLS-NOT: {{ }}_calloc
  71 // CHECK-SYMBOLS-NOT: {{ }}calloc
  72 // CHECK-SYMBOLS-NOT: {{ }}_free
  73 // CHECK-SYMBOLS-NOT: {{ }}free
  74 // CHECK-SYMBOLS-NOT: {{ }}_open