clang/test/CodeGen/debug-info-extern-call.c

   1 // When entry values are emitted, expect a subprogram for extern decls so that
   2 // the dwarf generator can describe call site parameters at extern call sites.
   3 //
   4 // Initial implementation relied on the 'retainedTypes:' from the corresponding
   5 // DICompileUnit, so we also ensure that we do not store the extern declaration
   6 // subprogram into the 'retainedTypes:'.
   7 //
   8 // RUN: %clang -g -O2 -target x86_64-none-linux-gnu -S -emit-llvm %s -o - \
   9 // RUN:   | FileCheck %s -check-prefix=DECLS-FOR-EXTERN
  10
  11 // Similarly, when the debugger tuning is gdb, expect a subprogram for extern
  12 // decls so that the dwarf generator can describe information needed for tail
  13 // call frame reconstrution.
  14 //
  15 // RUN: %clang -gdwarf-4 -O2 -target x86_64-none-linux-gnu -ggdb -S -emit-llvm %s -o - \
  16 // RUN:   | FileCheck %s -check-prefix=DECLS-FOR-EXTERN
  17 //
  18 // Do not emit a subprogram for extern decls when entry values are disabled and
  19 // the tuning is not set to gdb.
  20 //
  21 // RUN: %clang -gdwarf-4 -O2 -target x86_64-none-linux-gnu -gsce -S -emit-llvm %s -o - \
  22 // RUN:   | FileCheck %s -check-prefix=NO-DECLS-FOR-EXTERN
  23
  24 // DECLS-FOR-EXTERN-NOT: !DICompileUnit({{.*}}retainedTypes: !{{[0-9]+}}
  25 // DECLS-FOR-EXTERN: [[INT_TYPE:![0-9]+]] = !DIBasicType(name: "int",
  26 // DECLS-FOR-EXTERN: !DISubprogram(name: "fn1"
  27 // DECLS-FOR-EXTERN-SAME: type: [[FN1_TYPE:![0-9]+]],
  28 // DECLS-FOR-EXTERN: [[FN1_TYPE]] = !DISubroutineType(types: [[FN1_TYPES:![0-9]+]])
  29 // DECLS-FOR-EXTERN: [[FN1_TYPES]] = !{[[X_TYPE:![0-9]+]],
  30 // DECLS-FOR-EXTERN: [[X_TYPE]] = !DIDerivedType(tag: DW_TAG_typedef, name: "x",
  31 // DECLS-FOR-EXTERN-SAME: baseType: [[INT_TYPE]])
  32 // DECLS-FOR-EXTERN: !DISubprogram(name: "memcmp"
  33 // DECLS-FOR-EXTERN: !DISubprogram(name: "__some_reserved_name"
  34
  35 // NO-DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "fn1"
  36 // NO-DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "memcmp"
  37 // NO-DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "__some_reserved_name"
  38
  39 typedef int x;
  40 extern x fn1(int a, int b);
  41 extern int memcmp(const void *s1, const void *s2, unsigned long n);
  42 extern void __some_reserved_name(void);
  43
  44 int fn2 (int *src, int *dst) {
  45   int x = 4, y = 5;
  46   int res = fn1(x, y);
  47   int res2 = memcmp(dst, src, res);
  48   __some_reserved_name();
  49   return res + res2;
  50 }
  51