783d84bb39
Another attempt to land the changes in debug line header to prevent duplicate files in Dwarf 5. I rolled back my previous commit because of a mistake in generating the object file in a test. Meanwhile, I addressed some offline comments and changed the implementation; the largest difference is that MCDwarfLineTableHeader does not keep DwarfVersion but gets it as a parameter. I also merged the patch to fix two lld tests that will strt to fail into this patch. Original Commit: https://reviews.llvm.org/D59515 Original Message: Motivation: In previous dwarf versions, file name indexes started from 1, and the primary source file was not explicit. Dwarf 5 standard (6.2.4) prescribes the primary source file to be explicitly given an entry with an index number 0. The current implementation honors the specification by just duplicating the main source file, once with index number 0, and later maybe with another index number. While this is compliant with the letter of the standard, the duplication causes problems for consumers of this information such as lldb. (Some files are duplicated, where only some of them have a line table although all refer to the same file) With this change, dwarf 5 debug line section files always start from 0, and the zeroth entry is not duplicated whenever possible. This requires different handling of dwarf 4 and dwarf 5 during generation (e.g. when a function returns an index zero for a file name, it signals an error in dwarf 4, but not in dwarf 5) However, I think the minor complication is worth it, because it enables all consumers (lldb, gdb, dwarfdump, objdump, and so on) to treat all files in the file name list homogenously. llvm-svn: 358732
221 lines
8.0 KiB
ArmAsm
221 lines
8.0 KiB
ArmAsm
# The code below is the reduced version of the output
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# from the following invocation and source:
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#
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# // test.cpp:
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#void f1() {}
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#void f2() {}
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#
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# clang -gdwarf-5 -ffunction-sections test.cpp -o test.s -S
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux -dwarf-version=5 %s -o %t.o
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# RUN: llvm-objdump -disassemble -line-numbers -r -s -section-headers -t %t.o | FileCheck %s
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# CHECK: 0000000000000000 _Z2f1v
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# CHECK-NOT: test.cpp:2
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# CHECK: test.cpp:1
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# CHECK-NOT: test.cpp:2
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# CHECK: 0000000000000000 _Z2f2v
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# CHECK-NOT: test.cpp:1
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# CHECK: test.cpp:2
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# CHECK-NOT: test.cpp:1
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.text
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.file "test.cpp"
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.section .text._Z2f1v,"ax",@progbits
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.globl _Z2f1v # -- Begin function _Z2f1v
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.p2align 4, 0x90
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.type _Z2f1v,@function
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_Z2f1v: # @_Z2f1v
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.Lfunc_begin0:
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.file 0 "/home/avl" "test.cpp" md5 0xefae234cc05b45384d782316d3a5d338
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.loc 0 1 0 # test.cpp:1:0
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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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.Ltmp0:
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.loc 0 1 12 prologue_end # test.cpp:1:12
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popq %rbp
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.cfi_def_cfa %rsp, 8
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retq
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.Ltmp1:
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.Lfunc_end0:
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.size _Z2f1v, .Lfunc_end0-_Z2f1v
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.cfi_endproc
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# -- End function
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.section .text._Z2f2v,"ax",@progbits
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.globl _Z2f2v # -- Begin function _Z2f2v
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.p2align 4, 0x90
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.type _Z2f2v,@function
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_Z2f2v: # @_Z2f2v
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.Lfunc_begin1:
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.loc 0 2 0 # test.cpp:2:0
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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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.Ltmp2:
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.loc 0 2 12 prologue_end # test.cpp:2:12
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popq %rbp
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.cfi_def_cfa %rsp, 8
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retq
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.Ltmp3:
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.Lfunc_end1:
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.size _Z2f2v, .Lfunc_end1-_Z2f2v
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.cfi_endproc
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# -- End function
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.section .debug_str_offsets,"",@progbits
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.long 32
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.short 5
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.short 0
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.Lstr_offsets_base0:
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.section .debug_str,"MS",@progbits,1
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.Linfo_string0:
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.asciz "clang version 9.0.0 (https://github.com/llvm/llvm-project.git ebfc1e5af7a65381d858612517e6414ef58df482)" # string offset=0
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.Linfo_string1:
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.asciz "test.cpp" # string offset=104
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.Linfo_string2:
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.asciz "/home/avl" # string offset=113
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.Linfo_string3:
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.asciz "_Z2f1v" # string offset=123
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.Linfo_string4:
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.asciz "f1" # string offset=130
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.Linfo_string5:
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.asciz "_Z2f2v" # string offset=133
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.Linfo_string6:
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.asciz "f2" # string offset=140
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.section .debug_str_offsets,"",@progbits
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.long .Linfo_string0
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.long .Linfo_string1
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.long .Linfo_string2
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.long .Linfo_string3
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.long .Linfo_string4
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.long .Linfo_string5
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.long .Linfo_string6
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.section .debug_abbrev,"",@progbits
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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 37 # DW_FORM_strx1
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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 37 # DW_FORM_strx1
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.byte 114 # DW_AT_str_offsets_base
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.byte 23 # DW_FORM_sec_offset
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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 37 # DW_FORM_strx1
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.byte 115 # DW_AT_addr_base
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.byte 23 # DW_FORM_sec_offset
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.byte 17 # DW_AT_low_pc
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.byte 1 # DW_FORM_addr
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.byte 85 # DW_AT_ranges
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.byte 35 # DW_FORM_rnglistx
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.byte 116 # DW_AT_rnglists_base
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.byte 23 # DW_FORM_sec_offset
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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 0 # DW_CHILDREN_no
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.byte 17 # DW_AT_low_pc
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.byte 27 # DW_FORM_addrx
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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 110 # DW_AT_linkage_name
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.byte 37 # DW_FORM_strx1
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.byte 3 # DW_AT_name
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.byte 37 # DW_FORM_strx1
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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 63 # DW_AT_external
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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 0 # EOM(3)
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.section .debug_info,"",@progbits
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.Lcu_begin0:
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.long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
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.Ldebug_info_start0:
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.short 5 # DWARF version number
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.byte 1 # DWARF Unit Type
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.byte 8 # Address Size (in bytes)
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.long .debug_abbrev # Offset Into Abbrev. Section
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.byte 1 # Abbrev [1] 0xc:0x38 DW_TAG_compile_unit
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.byte 0 # DW_AT_producer
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.short 4 # DW_AT_language
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.byte 1 # DW_AT_name
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.long .Lstr_offsets_base0 # DW_AT_str_offsets_base
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.long .Lline_table_start0 # DW_AT_stmt_list
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.byte 2 # DW_AT_comp_dir
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.long .Laddr_table_base0 # DW_AT_addr_base
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.quad 0 # DW_AT_low_pc
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.byte 0 # DW_AT_ranges
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.long .Lrnglists_table_base0 # DW_AT_rnglists_base
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.byte 2 # Abbrev [2] 0x2b:0xc DW_TAG_subprogram
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.byte 0 # DW_AT_low_pc
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.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
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.byte 1 # DW_AT_frame_base
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.byte 86
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.byte 3 # DW_AT_linkage_name
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.byte 4 # DW_AT_name
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.byte 1 # DW_AT_decl_file
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.byte 1 # DW_AT_decl_line
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# DW_AT_external
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.byte 2 # Abbrev [2] 0x37:0xc DW_TAG_subprogram
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.byte 1 # DW_AT_low_pc
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.long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
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.byte 1 # DW_AT_frame_base
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.byte 86
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.byte 5 # DW_AT_linkage_name
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.byte 6 # DW_AT_name
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.byte 1 # DW_AT_decl_file
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.byte 2 # DW_AT_decl_line
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# DW_AT_external
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.byte 0 # End Of Children Mark
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.Ldebug_info_end0:
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.section .debug_rnglists,"",@progbits
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.long .Ldebug_rnglist_table_end0-.Ldebug_rnglist_table_start0 # Length
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.Ldebug_rnglist_table_start0:
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.short 5 # Version
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.byte 8 # Address size
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.byte 0 # Segment selector size
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.long 1 # Offset entry count
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.Lrnglists_table_base0:
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.long .Ldebug_ranges0-.Lrnglists_table_base0
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.Ldebug_ranges0:
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.byte 3 # DW_RLE_startx_length
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.byte 0 # start index
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.uleb128 .Lfunc_end0-.Lfunc_begin0 # length
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.byte 3 # DW_RLE_startx_length
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.byte 1 # start index
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.uleb128 .Lfunc_end1-.Lfunc_begin1 # length
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.byte 0 # DW_RLE_end_of_list
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.Ldebug_rnglist_table_end0:
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.Ldebug_addr_start0:
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.short 5 # DWARF version number
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.byte 8 # Address size
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.byte 0 # Segment selector size
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.Laddr_table_base0:
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.quad .Lfunc_begin0
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.quad .Lfunc_begin1
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.Ldebug_addr_end0:
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.section .debug_line,"",@progbits
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.Lline_table_start0:
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