llvm/test/tools/dsymutil/X86/DWARFLinkerParallel/dead-stripped.cpp

   1 // RUN: dsymutil --linker parallel --no-odr -f -y %p/../dummy-debug-map.map -oso-prepend-path \
   2 // RUN: %p/../../Inputs/dead-stripped -o - | llvm-dwarfdump - --debug-info | \
   3 // RUN: FileCheck %s --implicit-check-not \
   4 // RUN: "{{DW_AT_low_pc|DW_AT_high_pc|DW_AT_location|DW_TAG|NULL}}"
   5 //
   6 // RUN: dsymutil --linker parallel -f -y %p/../dummy-debug-map.map -oso-prepend-path \
   7 // RUN: %p/../../Inputs/dead-stripped -o - | llvm-dwarfdump - --debug-info | \
   8 // RUN: FileCheck %s --implicit-check-not \
   9 // RUN: "{{DW_AT_low_pc|DW_AT_high_pc|DW_AT_location|DW_TAG|NULL}}" \
  10 // RUN: --check-prefixes=CHECK-LLVM
  11
  12 // The test was compiled with:
  13 // clang++ -O2 -g -c dead-strip.cpp -o 1.o
  14
  15 // The goal of the test is to exercise dsymutil's behavior in presence of
  16 // functions/variables that have been dead-stripped by the linker but
  17 // that are still present in the linked debug info (in this case because
  18 // they have been DW_TAG_import'd in another namespace).
  19
  20 // CHECK-LLVM: DW_TAG_compile_unit
  21 // CHECK-LLVM: DW_AT_name{{.*}}"__artificial_type_unit"
  22 // CHECK-LLVM: DW_TAG_namespace
  23 // CHECK-LLVM: DW_AT_name{{.*}}"N"
  24 // CHECK-LLVM: NULL
  25 //
  26 // CHECK-LLVM: DW_TAG_compile_unit
  27 // CHECK-LLVM:   DW_AT_low_pc
  28 // CHECK-LLVM:   DW_AT_high_pc
  29 // CHECK-LLVM: DW_TAG_base_type
  30 // CHECK-LLVM: DW_TAG_imported_module
  31 // CHECK-LLVM: DW_TAG_subprogram
  32 // CHECK-LLVM:   DW_AT_low_pc
  33 // CHECK-LLVM:   DW_AT_high_pc
  34 // CHECK-LLVM: DW_TAG_base_type
  35 // CHECK-LLVM: NULL
  36
  37 // Everything in the N namespace below doesn't have a debug map entry, and
  38 // thus is considered dead (::foo() has a debug map entry, otherwise dsymutil
  39 // would just drop the CU altogether).
  40
  41 // CHECK: DW_TAG_compile_unit
  42 // CHECK:   DW_AT_low_pc
  43 // CHECK:   DW_AT_high_pc
  44 // CHECK:   DW_TAG_namespace
  45 namespace N {
  46 int blah = 42;
  47
  48 __attribute__((always_inline)) int foo() { return blah; }
  49
  50 int bar(unsigned i) {
  51         int val = foo();
  52         if (i)
  53                 return val + bar(i-1);
  54         return foo();
  55 }
  56 }
  57 // CHECK: DW_TAG_base_type
  58 // CHECK: DW_TAG_imported_module
  59 // CHECK: DW_TAG_subprogram
  60 // CHECK:   DW_AT_low_pc
  61 // CHECK:   DW_AT_high_pc
  62 // CHECK: DW_TAG_base_type
  63 // CHECK: NULL
  64
  65 using namespace N;
  66
  67 void foo() {}