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a554982ed6
When dumping ToT clan's debug info with dwarfdump, we were seeing an error saying that that the location list overflows the debug_loc section. After reducing the testcase we figured out that we were interpreting the DW_FORM_data4 as a section offset. In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset. Until now we didn't check check for the DWARF version, because some producers (read old versions of clang) were still emitting this. The relevant code/comment was added in 2013, and I believe it's now reasonable to start checking the version. The FormValue class is a little bit of a mess because it cashes the DWARF unit and context when it extracted the value itself. Several methods of the class rely on it being present, or return an Optional for the code path that needs it. At the same time the FormValue class also used in places where there's no DWARF unit. For this patch I went with the least invasive change: checking the version from the CU when it's available. If it's not (because the form value was created from a value directly) we default to the old behavior. Differential revision: https://reviews.llvm.org/D58698 llvm-svn: 355456
332 lines
14 KiB
ArmAsm
332 lines
14 KiB
ArmAsm
# Source:
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# struct e {
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# enum {} f[16384];
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# short g;
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# };
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# e foo() {
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# auto E = new e;
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# return *E;
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# }
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# Compile with:
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# clang -O2 -gdwarf-4 -S a.cpp -o a4.s
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# RUN: llvm-mc %s -filetype obj -triple x86_64-apple-darwin -o %t.o
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# RUN: llvm-dwarfdump -debug-info -name g %t.o | FileCheck %s
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# CHECK: DW_TAG_member
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# CHECK: DW_AT_name ("g")
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# CHECK: DW_AT_data_member_location (0x4000)
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.section __TEXT,__text,regular,pure_instructions
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.macosx_version_min 10, 14
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.globl __Z3foov ## -- Begin function _Z3foov
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.p2align 4, 0x90
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__Z3foov: ## @_Z3foov
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Lfunc_begin0:
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.file 1 "/private/tmp" "a.cpp"
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.loc 1 5 0 ## a.cpp:5:0
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.cfi_startproc
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## %bb.0: ## %entry
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pushq %rbp
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.cfi_def_cfa_offset 16
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.cfi_offset %rbp, -16
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movq %rsp, %rbp
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.cfi_def_cfa_register %rbp
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pushq %rbx
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pushq %rax
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.cfi_offset %rbx, -24
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movq %rdi, %rbx
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Ltmp0:
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.loc 1 6 12 prologue_end ## a.cpp:6:12
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movl $16385, %edi ## imm = 0x4001
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callq __Znwm
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Ltmp1:
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##DEBUG_VALUE: foo:E <- $rax
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.loc 1 7 10 ## a.cpp:7:10
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movl $16385, %edx ## imm = 0x4001
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movq %rbx, %rdi
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movq %rax, %rsi
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callq _memcpy
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Ltmp2:
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.loc 1 8 1 ## a.cpp:8:1
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movq %rbx, %rax
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addq $8, %rsp
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popq %rbx
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popq %rbp
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retq
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Ltmp3:
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Lfunc_end0:
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.cfi_endproc
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## -- End function
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.section __DWARF,__debug_str,regular,debug
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Linfo_string:
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.asciz "clang version 9.0.0 (git@github.com:llvm/llvm-project.git 10de39548976ae224709acdc1c337e33cf12f3c0)" ## string offset=0
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.asciz "a.cpp" ## string offset=100
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.asciz "/private/tmp" ## string offset=106
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.asciz "foo" ## string offset=119
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.asciz "_Z3foov" ## string offset=123
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.asciz "e" ## string offset=131
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.asciz "f" ## string offset=133
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.asciz "char" ## string offset=135
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.asciz "__ARRAY_SIZE_TYPE__" ## string offset=140
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.asciz "g" ## string offset=160
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.asciz "E" ## string offset=162
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.section __DWARF,__debug_loc,regular,debug
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Lsection_debug_loc:
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Ldebug_loc0:
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.set Lset0, Ltmp1-Lfunc_begin0
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.quad Lset0
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.set Lset1, Ltmp2-Lfunc_begin0
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.quad Lset1
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.short 1 ## Loc expr size
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.byte 80 ## DW_OP_reg0
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.quad 0
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.quad 0
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.section __DWARF,__debug_abbrev,regular,debug
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Lsection_abbrev:
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.byte 1 ## Abbreviation Code
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.byte 17 ## DW_TAG_compile_unit
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.byte 1 ## DW_CHILDREN_yes
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.byte 37 ## DW_AT_producer
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.byte 14 ## DW_FORM_strp
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.byte 19 ## DW_AT_language
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.byte 5 ## DW_FORM_data2
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 16 ## DW_AT_stmt_list
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.byte 23 ## DW_FORM_sec_offset
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.byte 27 ## DW_AT_comp_dir
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.byte 14 ## DW_FORM_strp
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.ascii "\264B" ## DW_AT_GNU_pubnames
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.byte 25 ## DW_FORM_flag_present
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.ascii "\341\177" ## DW_AT_APPLE_optimized
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.byte 25 ## DW_FORM_flag_present
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.byte 17 ## DW_AT_low_pc
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.byte 1 ## DW_FORM_addr
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.byte 18 ## DW_AT_high_pc
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.byte 6 ## DW_FORM_data4
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 2 ## Abbreviation Code
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.byte 46 ## DW_TAG_subprogram
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.byte 1 ## DW_CHILDREN_yes
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.byte 17 ## DW_AT_low_pc
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.byte 1 ## DW_FORM_addr
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.byte 18 ## DW_AT_high_pc
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.byte 6 ## DW_FORM_data4
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.byte 64 ## DW_AT_frame_base
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.byte 24 ## DW_FORM_exprloc
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.byte 122 ## DW_AT_call_all_calls
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.byte 25 ## DW_FORM_flag_present
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.byte 110 ## DW_AT_linkage_name
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.byte 14 ## DW_FORM_strp
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 63 ## DW_AT_external
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.byte 25 ## DW_FORM_flag_present
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.ascii "\341\177" ## DW_AT_APPLE_optimized
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.byte 25 ## DW_FORM_flag_present
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 3 ## Abbreviation Code
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.byte 52 ## DW_TAG_variable
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.byte 0 ## DW_CHILDREN_no
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.byte 2 ## DW_AT_location
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.byte 23 ## DW_FORM_sec_offset
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 4 ## Abbreviation Code
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.byte 19 ## DW_TAG_structure_type
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.byte 1 ## DW_CHILDREN_yes
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.byte 54 ## DW_AT_calling_convention
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.byte 11 ## DW_FORM_data1
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 11 ## DW_AT_byte_size
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.byte 5 ## DW_FORM_data2
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 5 ## Abbreviation Code
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.byte 13 ## DW_TAG_member
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 56 ## DW_AT_data_member_location
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 6 ## Abbreviation Code
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.byte 13 ## DW_TAG_member
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 58 ## DW_AT_decl_file
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.byte 11 ## DW_FORM_data1
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.byte 59 ## DW_AT_decl_line
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.byte 11 ## DW_FORM_data1
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.byte 56 ## DW_AT_data_member_location
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.byte 5 ## DW_FORM_data2
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 7 ## Abbreviation Code
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.byte 1 ## DW_TAG_array_type
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.byte 1 ## DW_CHILDREN_yes
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 8 ## Abbreviation Code
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.byte 33 ## DW_TAG_subrange_type
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.byte 0 ## DW_CHILDREN_no
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 55 ## DW_AT_count
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.byte 5 ## DW_FORM_data2
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 9 ## Abbreviation Code
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.byte 36 ## DW_TAG_base_type
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 62 ## DW_AT_encoding
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.byte 11 ## DW_FORM_data1
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.byte 11 ## DW_AT_byte_size
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 10 ## Abbreviation Code
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.byte 36 ## DW_TAG_base_type
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.byte 0 ## DW_CHILDREN_no
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.byte 3 ## DW_AT_name
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.byte 14 ## DW_FORM_strp
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.byte 11 ## DW_AT_byte_size
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.byte 11 ## DW_FORM_data1
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.byte 62 ## DW_AT_encoding
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.byte 11 ## DW_FORM_data1
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 11 ## Abbreviation Code
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.byte 15 ## DW_TAG_pointer_type
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.byte 0 ## DW_CHILDREN_no
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.byte 73 ## DW_AT_type
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.byte 19 ## DW_FORM_ref4
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.byte 0 ## EOM(1)
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.byte 0 ## EOM(2)
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.byte 0 ## EOM(3)
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.section __DWARF,__debug_info,regular,debug
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Lsection_info:
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Lcu_begin0:
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.set Lset2, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit
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.long Lset2
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Ldebug_info_start0:
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.short 4 ## DWARF version number
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.set Lset3, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
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.long Lset3
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.byte 8 ## Address Size (in bytes)
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.byte 1 ## Abbrev [1] 0xb:0x91 DW_TAG_compile_unit
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.long 0 ## DW_AT_producer
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.short 4 ## DW_AT_language
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.long 100 ## DW_AT_name
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.set Lset4, Lline_table_start0-Lsection_line ## DW_AT_stmt_list
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.long Lset4
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.long 106 ## DW_AT_comp_dir
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## DW_AT_GNU_pubnames
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## DW_AT_APPLE_optimized
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.quad Lfunc_begin0 ## DW_AT_low_pc
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.set Lset5, Lfunc_end0-Lfunc_begin0 ## DW_AT_high_pc
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.long Lset5
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.byte 2 ## Abbrev [2] 0x2a:0x2d DW_TAG_subprogram
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.quad Lfunc_begin0 ## DW_AT_low_pc
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.set Lset6, Lfunc_end0-Lfunc_begin0 ## DW_AT_high_pc
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.long Lset6
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.byte 1 ## DW_AT_frame_base
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.byte 86
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## DW_AT_call_all_calls
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.long 123 ## DW_AT_linkage_name
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.long 119 ## DW_AT_name
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.byte 1 ## DW_AT_decl_file
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.byte 5 ## DW_AT_decl_line
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.long 87 ## DW_AT_type
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## DW_AT_external
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## DW_AT_APPLE_optimized
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.byte 3 ## Abbrev [3] 0x47:0xf DW_TAG_variable
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.set Lset7, Ldebug_loc0-Lsection_debug_loc ## DW_AT_location
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.long Lset7
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.long 162 ## DW_AT_name
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.byte 1 ## DW_AT_decl_file
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.byte 6 ## DW_AT_decl_line
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.long 150 ## DW_AT_type
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.byte 0 ## End Of Children Mark
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.byte 4 ## Abbrev [4] 0x57:0x24 DW_TAG_structure_type
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.byte 5 ## DW_AT_calling_convention
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.long 131 ## DW_AT_name
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.short 16385 ## DW_AT_byte_size
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.byte 1 ## DW_AT_decl_file
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.byte 1 ## DW_AT_decl_line
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.byte 5 ## Abbrev [5] 0x61:0xc DW_TAG_member
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.long 133 ## DW_AT_name
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.long 123 ## DW_AT_type
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.byte 1 ## DW_AT_decl_file
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.byte 2 ## DW_AT_decl_line
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.byte 0 ## DW_AT_data_member_location
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.byte 6 ## Abbrev [6] 0x6d:0xd DW_TAG_member
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.long 160 ## DW_AT_name
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.long 136 ## DW_AT_type
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.byte 1 ## DW_AT_decl_file
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.byte 3 ## DW_AT_decl_line
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.short 16384 ## DW_AT_data_member_location
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.byte 0 ## End Of Children Mark
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.byte 7 ## Abbrev [7] 0x7b:0xd DW_TAG_array_type
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.long 136 ## DW_AT_type
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.byte 8 ## Abbrev [8] 0x80:0x7 DW_TAG_subrange_type
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.long 143 ## DW_AT_type
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.short 16384 ## DW_AT_count
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.byte 0 ## End Of Children Mark
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.byte 9 ## Abbrev [9] 0x88:0x7 DW_TAG_base_type
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.long 135 ## DW_AT_name
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.byte 6 ## DW_AT_encoding
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.byte 1 ## DW_AT_byte_size
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.byte 10 ## Abbrev [10] 0x8f:0x7 DW_TAG_base_type
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.long 140 ## DW_AT_name
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.byte 8 ## DW_AT_byte_size
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.byte 7 ## DW_AT_encoding
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.byte 11 ## Abbrev [11] 0x96:0x5 DW_TAG_pointer_type
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.long 87 ## DW_AT_type
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.byte 0 ## End Of Children Mark
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Ldebug_info_end0:
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.section __DWARF,__debug_macinfo,regular,debug
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Ldebug_macinfo:
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.byte 0 ## End Of Macro List Mark
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.subsections_via_symbols
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.section __DWARF,__debug_line,regular,debug
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Lsection_line:
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Lline_table_start0:
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