lld/test/ELF/gdb-index-dwarf5-type-unit.s

   1 # REQUIRES: x86, zlib
   2 ## -gdwarf-5 -fdebug-types-section may produce multiple .debug_info sections.
   3 ## All except one are type units. Test we can locate the compile unit, add it to
   4 ## the index, and not erroneously duplicate it (which would happen if we
   5 ## consider every .debug_info a compile unit).
   6
   7 # RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
   8 # RUN: ld.lld --gdb-index -Ttext=0x1000 %t.o -o %t
   9 # RUN: llvm-dwarfdump --gdb-index %t | FileCheck %s
  10
  11 ## Test we don't uncompress a section while another thread is concurrently
  12 ## accessing it. This would be detected by tsan as a data race.
  13 # RUN: llvm-objcopy --compress-debug-sections %t.o
  14 # RUN: ld.lld --gdb-index -Ttext=0x1000 %t.o -o %t1
  15 # RUN: llvm-dwarfdump --gdb-index %t1 | FileCheck %s
  16
  17 ## In this test, there are actually two compile unit .debug_info (very uncommon;
  18 ## -r --unique). Currently we only handle the last compile unit.
  19 # CHECK:      CU list offset = 0x18, has 1 entries:
  20 # CHECK-NEXT:   0: Offset = 0x32, Length = 0x19
  21
  22 # CHECK:      Address area offset = 0x28, has 1 entries:
  23 # CHECK-NEXT:   Low/High address = [0x1001, 0x1002) (Size: 0x1), CU id = 0
  24
  25 .Lfunc_begin0:
  26   ret
  27 .Lfunc_end0:
  28 .Lfunc_begin1:
  29   ret
  30 .Lfunc_end1:
  31
  32 .section  .debug_abbrev,"",@progbits
  33   .byte  1                         # Abbreviation Code
  34   .byte  65                        # DW_TAG_type_unit
  35   .byte  0                         # DW_CHILDREN_no
  36   .byte  0                         # EOM(1)
  37   .byte  0                         # EOM(2)
  38
  39   .byte  2                         # Abbreviation Code
  40   .byte  17                        # DW_TAG_compile_unit
  41   .byte  0                         # DW_CHILDREN_no
  42   .byte  17                        # DW_AT_low_pc
  43   .byte  1                         # DW_FORM_addr
  44   .byte  18                        # DW_AT_high_pc
  45   .byte  6                         # DW_FORM_data4
  46   .byte  0                         # EOM(1)
  47   .byte  0                         # EOM(2)
  48
  49   .byte  0                         # EOM(3)
  50
  51 .macro TYPE_UNIT id signature
  52 .section  .debug_info,"G",@progbits,\signature
  53   .long  .Ldebug_info_end\id-.Ldebug_info_start\id # Length of Unit
  54 .Ldebug_info_start\id:
  55   .short 5                         # DWARF version number
  56   .byte  2                         # DWARF Unit Type
  57   .byte  8                         # Address Size
  58   .long  .debug_abbrev             # Offset Into Abbrev. Section
  59   .quad  \signature                # Type Signature
  60   .long  .Ldebug_info_end\id       # Type DIE Offset
  61   .byte  1                         # Abbrev [1] DW_TAG_type_unit
  62 .Ldebug_info_end\id:
  63 .endm
  64
  65 ## We place compile units between two type units (rare). A naive approach will
  66 ## take either the first or the last .debug_info
  67 TYPE_UNIT 0, 123
  68
  69 .section  .debug_info,"",@progbits,unique,0
  70 .Lcu_begin0:
  71   .long .Lcu_end0-.Lcu_begin0-4    # Length of Unit
  72   .short 5                         # DWARF version number
  73   .byte  1                         # DWARF Unit Type
  74   .byte  8                         # Address Size
  75   .long  .debug_abbrev             # Offset Into Abbrev. Section
  76   .byte  2                         # Abbrev [2] DW_TAG_compile_unit
  77   .quad  .Lfunc_begin0             # DW_AT_low_pc
  78   .long  .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
  79 .Lcu_end0:
  80
  81 .section  .debug_info,"",@progbits,unique,1
  82 .Lcu_begin1:
  83   .long .Lcu_end1-.Lcu_begin1-4    # Length of Unit
  84   .short 5                         # DWARF version number
  85   .byte  1                         # DWARF Unit Type
  86   .byte  8                         # Address Size
  87   .long  .debug_abbrev             # Offset Into Abbrev. Section
  88   .byte  2                         # Abbrev [2] DW_TAG_compile_unit
  89   .quad  .Lfunc_begin1             # DW_AT_low_pc
  90   .long  .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
  91 .Lcu_end1:
  92
  93 TYPE_UNIT 1, 456