clang/test/Preprocessor/pragma-pushpop-macro.c

   1 /* Test pragma pop_macro and push_macro directives from
   2    http://msdn.microsoft.com/en-us/library/hsttss76.aspx */
   3
   4 // pop_macro: Sets the value of the macro_name macro to the value on the top of
   5 // the stack for this macro.
   6 // #pragma pop_macro("macro_name")
   7 // push_macro: Saves the value of the macro_name macro on the top of the stack
   8 // for this macro.
   9 // #pragma push_macro("macro_name")
  10 //
  11 // RUN: %clang_cc1 -fms-extensions -E %s -o - | FileCheck %s
  12
  13 #define X 1
  14 #define Y 2
  15 int pmx0 = X;
  16 int pmy0 = Y;
  17 #define Y 3
  18 #pragma push_macro("Y")
  19 #pragma push_macro("X")
  20 int pmx1 = X;
  21 #define X 2
  22 int pmx2 = X;
  23 #pragma pop_macro("X")
  24 int pmx3 = X;
  25 #pragma pop_macro("Y")
  26 int pmy1 = Y;
  27
  28 // Have a stray 'push' to show we don't crash when having imbalanced
  29 // push/pop
  30 #pragma push_macro("Y")
  31 #define Y 4
  32 int pmy2 = Y;
  33
  34 // The sequence push, define/undef, pop caused problems if macro was not
  35 // previously defined.
  36 #pragma push_macro("PREVIOUSLY_UNDEFINED1")
  37 #undef PREVIOUSLY_UNDEFINED1
  38 #pragma pop_macro("PREVIOUSLY_UNDEFINED1")
  39 #ifndef PREVIOUSLY_UNDEFINED1
  40 int Q;
  41 #endif
  42
  43 #pragma push_macro("PREVIOUSLY_UNDEFINED2")
  44 #define PREVIOUSLY_UNDEFINED2
  45 #pragma pop_macro("PREVIOUSLY_UNDEFINED2")
  46 #ifndef PREVIOUSLY_UNDEFINED2
  47 int P;
  48 #endif
  49
  50 // CHECK: int pmx0 = 1
  51 // CHECK: int pmy0 = 2
  52 // CHECK: int pmx1 = 1
  53 // CHECK: int pmx2 = 2
  54 // CHECK: int pmx3 = 1
  55 // CHECK: int pmy1 = 3
  56 // CHECK: int pmy2 = 4
  57 // CHECK: int Q;
  58 // CHECK: int P;