# Test handling of forward-declared (DW_AT_declaration) structures. These types # can be produced due to vtable-based type homing, or other -flimit-debug-info # optimizations. # REQUIRES: x86 # RUN: split-file %s %t # RUN: llvm-mc --triple x86_64-pc-linux %t/asm --filetype=obj -o %t.o # RUN: %lldb -o "settings set interpreter.stop-command-source-on-error false" \ # RUN: -s %t/commands -o exit %t.o 2>&1 | FileCheck %s #--- commands # Type A should be treated as a forward-declaration even though it has a child. target var a # CHECK-LABEL: target var a # FIXME: This should also produce some kind of an error. # CHECK: (A) a = {} expr a # CHECK-LABEL: expr a # CHECK: incomplete type 'A' where a complete type is required # Parsing B::B1 should not crash even though B is incomplete. Note that in this # case B must be forcefully completed. target var b1 # CHECK-LABEL: target var b1 # CHECK: (B::B1) b1 = (ptr = 0x00000000baadf00d) expr b1 # CHECK-LABEL: expr b1 # CHECK: (B::B1) $0 = (ptr = 0x00000000baadf00d) target var c1 # CHECK-LABEL: target var c1 # CHECK: (C::C1) c1 = 424742 expr c1 # CHECK-LABEL: expr c1 # CHECK: (C::C1) $1 = 424742 #--- asm .text _ZN1AC2Ev: retq .LZN1AC2Ev_end: .data .p2align 4 a: .quad _ZTV1A+16 .quad 0xdeadbeef b1: .quad 0xbaadf00d c1: .long 42474247 .section .debug_abbrev,"",@progbits .byte 1 # Abbreviation Code .byte 17 # DW_TAG_compile_unit .byte 1 # DW_CHILDREN_yes .byte 37 # DW_AT_producer .byte 8 # DW_FORM_string .byte 17 # DW_AT_low_pc .byte 1 # DW_FORM_addr .byte 18 # DW_AT_high_pc .byte 6 # DW_FORM_data4 .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 2 # Abbreviation Code .byte 52 # DW_TAG_variable .byte 0 # DW_CHILDREN_no .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 73 # DW_AT_type .byte 19 # DW_FORM_ref4 .byte 2 # DW_AT_location .byte 24 # DW_FORM_exprloc .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 3 # Abbreviation Code .byte 19 # DW_TAG_structure_type .byte 1 # DW_CHILDREN_yes .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 60 # DW_AT_declaration .byte 25 # DW_FORM_flag_present .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 4 # Abbreviation Code .byte 46 # DW_TAG_subprogram .byte 1 # DW_CHILDREN_yes .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 60 # DW_AT_declaration .byte 25 # DW_FORM_flag_present .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 5 # Abbreviation Code .byte 5 # DW_TAG_formal_parameter .byte 0 # DW_CHILDREN_no .byte 73 # DW_AT_type .byte 19 # DW_FORM_ref4 .byte 52 # DW_AT_artificial .byte 25 # DW_FORM_flag_present .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 6 # Abbreviation Code .byte 2 # DW_TAG_class_type .byte 1 # DW_CHILDREN_yes .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 7 # Abbreviation Code .byte 13 # DW_TAG_member .byte 0 # DW_CHILDREN_no .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 73 # DW_AT_type .byte 19 # DW_FORM_ref4 .byte 56 # DW_AT_data_member_location .byte 11 # DW_FORM_data1 .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 8 # Abbreviation Code .byte 15 # DW_TAG_pointer_type .byte 0 # DW_CHILDREN_no .byte 73 # DW_AT_type .byte 19 # DW_FORM_ref4 .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 9 # Abbreviation Code .byte 36 # DW_TAG_base_type .byte 0 # DW_CHILDREN_no .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 62 # DW_AT_encoding .byte 11 # DW_FORM_data1 .byte 11 # DW_AT_byte_size .byte 11 # DW_FORM_data1 .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 10 # Abbreviation Code .byte 46 # DW_TAG_subprogram .byte 1 # DW_CHILDREN_yes .byte 17 # DW_AT_low_pc .byte 1 # DW_FORM_addr .byte 18 # DW_AT_high_pc .byte 6 # DW_FORM_data4 .byte 64 # DW_AT_frame_base .byte 24 # DW_FORM_exprloc .byte 100 # DW_AT_object_pointer .byte 19 # DW_FORM_ref4 .byte 71 # DW_AT_specification .byte 19 # DW_FORM_ref4 .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 11 # Abbreviation Code .byte 5 # DW_TAG_formal_parameter .byte 0 # DW_CHILDREN_no .byte 2 # DW_AT_location .byte 24 # DW_FORM_exprloc .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 73 # DW_AT_type .byte 19 # DW_FORM_ref4 .byte 52 # DW_AT_artificial .byte 25 # DW_FORM_flag_present .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 12 # Abbreviation Code .byte 22 # DW_TAG_typedef .byte 0 # DW_CHILDREN_no .byte 73 # DW_AT_type .byte 19 # DW_FORM_ref4 .byte 3 # DW_AT_name .byte 8 # DW_FORM_string .byte 0 # EOM(1) .byte 0 # EOM(2) .byte 0 # EOM(3) .section .debug_info,"",@progbits .Lcu_begin0: .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit .Ldebug_info_start0: .short 4 # DWARF version number .long .debug_abbrev # Offset Into Abbrev. Section .byte 8 # Address Size (in bytes) .byte 1 # Abbrev [1] DW_TAG_compile_unit .asciz "Hand-written DWARF" # DW_AT_producer .quad _ZN1AC2Ev # DW_AT_low_pc .long .LZN1AC2Ev_end-_ZN1AC2Ev # DW_AT_high_pc # Case 1: The compiler has omitted the declaration of the type, but it still # produces an entry for its implicit constructor instantiated in this compile # unit. # Roughly corresponds to this: # struct A { # virtual ~A(); // not defined here # // implicit A() {} # } a; .byte 2 # Abbrev [2] DW_TAG_variable .asciz "a" # DW_AT_name .long .LA-.Lcu_begin0 # DW_AT_type .byte 9 # DW_AT_location .byte 3 .quad a .LA: .byte 3 # Abbrev [3] DW_TAG_structure_type .asciz "A" # DW_AT_name # DW_AT_declaration .LA_A: .byte 4 # Abbrev [4] DW_TAG_subprogram .asciz "A" # DW_AT_name # DW_AT_declaration .byte 5 # Abbrev [5] DW_TAG_formal_parameter .long .LAptr-.Lcu_begin0 # DW_AT_type # DW_AT_artificial .byte 0 # End Of Children Mark .byte 0 # End Of Children Mark .LAptr: .byte 8 # Abbrev [8] DW_TAG_pointer_type .long .LA-.Lcu_begin0 # DW_AT_type .byte 10 # Abbrev [10] DW_TAG_subprogram .quad _ZN1AC2Ev # DW_AT_low_pc .long .LZN1AC2Ev_end-_ZN1AC2Ev # DW_AT_high_pc .byte 1 # DW_AT_frame_base .byte 86 .long .Lthis-.Lcu_begin0 # DW_AT_object_pointer .long .LA_A-.Lcu_begin0 # DW_AT_specification .Lthis: .byte 11 # Abbrev [11] DW_TAG_formal_parameter .byte 2 # DW_AT_location .byte 145 .byte 120 .asciz "this" # DW_AT_name .long .LAptr-.Lcu_begin0 # DW_AT_type # DW_AT_artificial .byte 0 # End Of Children Mark # Case 2: A structure has been emitted as a declaration only, but it contains a # nested class, which has a full definition present. # Rougly corresponds to this: # struct B { # virtual ~B(); // not defined here # class B1 { # A* ptr; # }; # }; # B::B1 b1; # Note that it is important that the inner type is a class (not struct) as that # triggers a clang assertion. .byte 3 # Abbrev [3] DW_TAG_structure_type .asciz "B" # DW_AT_name # DW_AT_declaration .LB1: .byte 6 # Abbrev [6] DW_TAG_class_type .asciz "B1" # DW_AT_name .byte 7 # Abbrev [5] 0x58:0xc DW_TAG_member .asciz "ptr" # DW_AT_name .long .LAptr # DW_AT_type .byte 0 # DW_AT_data_member_location .byte 0 # End Of Children Mark .byte 0 # End Of Children Mark .byte 2 # Abbrev [2] DW_TAG_variable .asciz "b1" # DW_AT_name .long .LB1-.Lcu_begin0 # DW_AT_type .byte 9 # DW_AT_location .byte 3 .quad b1 # Case 3: A typedef in DW_AT_declaration struct. # C++ equivalent: # struct C { # virtual ~C(); // not defined here # typedef int C1; # }; # C::C1 c1; .Lint: .byte 9 # Abbrev [9] DW_TAG_base_type .asciz "int" # DW_AT_name .byte 5 # DW_AT_encoding .byte 4 # DW_AT_byte_size .byte 3 # Abbrev [3] DW_TAG_structure_type .asciz "C" # DW_AT_name # DW_AT_declaration .LC1: .byte 12 # Abbrev [12] DW_TAG_typedef .long .Lint-.Lcu_begin0 # DW_AT_type .asciz "C1" # DW_AT_name .byte 0 # End Of Children Mark .byte 2 # Abbrev [2] DW_TAG_variable .asciz "c1" # DW_AT_name .long .LC1-.Lcu_begin0 # DW_AT_type .byte 9 # DW_AT_location .byte 3 .quad c1 .byte 0 # End Of Children Mark .Ldebug_info_end0: