# 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.
# 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 = <incomplete type "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 11 # DW_AT_byte_size
.byte 11 # DW_FORM_data1
.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 8 # DW_AT_byte_size
.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:
Codebase Browser
llvm