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74f7478d2b
Summary: This removes the use of zero as a base address in section-based dumping. Although this will often be true for (unlinked) object files with a single compile unit, it is not true in general. This means that section-based dumping will not be able to resolve entries referencing the base address (DW_LLE_offset_pair) -- it wasn't able to do that correctly before either, but now it will be more explicit about it. One exception to that is if the location list contains an explicit DW_LLE_base_address entry -- in this case the dumper will pick it up, and resolve subsequent entries normally. The patch also removes the fallback to zero in the "inline" dumping in case the compile unit does not contain a base address. Reviewers: dblaikie, probinson, JDevlieghere, aprantl, SouraVX Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70115
172 lines
7.6 KiB
Plaintext
172 lines
7.6 KiB
Plaintext
# RUN: llvm-mc %s -filetype obj -triple x86_64-pc-linux -o %t.o
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# RUN: llvm-dwarfdump -v %t.o | FileCheck %s
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# CHECK: .debug_info
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# CHECK: DW_AT_name{{.*}}"stub"
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# CHECK: DW_AT_location [DW_FORM_sec_offset] (0x0000000c
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# CHECK-NEXT: [0x0000000000000010, 0x0000000000000020): DW_OP_breg5 RDI+0
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# CHECK-NEXT: [0x0000000000000530, 0x0000000000000540): DW_OP_breg6 RBP-8, DW_OP_deref
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# CHECK-NEXT: [0x0000000000000700, 0x0000000000000710): DW_OP_breg5 RDI+0
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# CHECK: .debug_loclists contents:
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# CHECK-NEXT: 0x00000000: locations list header: length = 0x0000002c, version = 0x0005, addr_size = 0x08, seg_size = 0x00, offset_entry_count = 0x00000000
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# CHECK-NEXT: 0x0000000c:
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# CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000000, 0x0000000000000010): DW_OP_breg5 RDI+0
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# CHECK-NEXT: DW_LLE_base_address (0x0000000000000500)
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# CHECK-NEXT: DW_LLE_offset_pair (0x0000000000000030, 0x0000000000000040)
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# CHECK-NEXT: => [0x0000000000000530, 0x0000000000000540): DW_OP_breg6 RBP-8, DW_OP_deref
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# CHECK-NEXT: DW_LLE_start_length (0x0000000000000700, 0x0000000000000010)
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# CHECK-NEXT: => [0x0000000000000700, 0x0000000000000710): DW_OP_breg5 RDI+0
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# CHECK-NEXT: DW_LLE_end_of_list ()
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.section .debug_str,"MS",@progbits,1
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.asciz "stub"
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.section .debug_str_offsets,"",@progbits
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.long 68
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.short 5
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.short 0
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.Lstr_offsets_base0:
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.zero 64
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.section .debug_loclists,"",@progbits
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.long .Ldebug_loclist_table_end0-.Ldebug_loclist_table_start0
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.Ldebug_loclist_table_start0:
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.short 5 # Version.
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.byte 8 # Address size.
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.byte 0 # Segmen selector size.
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.long 0 # Offset entry count.
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.Lloclists_table_base0:
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.Ldebug_loc0:
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.byte 4 # DW_LLE_offset_pair
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.uleb128 0x0 # starting offset
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.uleb128 0x10 # ending offset
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.byte 2 # Loc expr size
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.byte 117 # DW_OP_breg5
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.byte 0 # 0
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.byte 6 # DW_LLE_base_address
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.quad 0x500 # Some address
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.byte 4 # DW_LLE_offset_pair
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.uleb128 0x30 # starting offset
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.uleb128 0x40 # ending offset
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.byte 3 # Loc expr size
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.byte 118 # DW_OP_breg6
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.byte 120 # -8
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.byte 6 # DW_OP_deref
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.byte 8 # DW_LLE_start_length
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.quad 0x700 # Some address
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.uleb128 0x10 # length
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.byte 2 # Loc expr size
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.byte 117 # DW_OP_breg5
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.byte 0 # 0
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.byte 0 # DW_LLE_end_of_list
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.Ldebug_loclist_table_end0:
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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 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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.ascii "\214\001" # DW_AT_loclists_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 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 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 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 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 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 .debug_info,"",@progbits
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.Lcu_begin0:
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.long 70 # Length of Unit
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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:0xef 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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.quad 0x10 # DW_AT_low_pc
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.long 0 # DW_AT_high_pc
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.long .Lloclists_table_base0 # DW_AT_loclists_base
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.byte 2 # Abbrev [2] 0x2a:0x20 DW_TAG_subprogram
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.quad 0 # DW_AT_low_pc
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.long 0 # 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 11 # DW_AT_linkage_name
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.byte 12 # 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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# DW_AT_external
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.byte 3 # Abbrev [3] 0x40:0xb DW_TAG_variable
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.long .Ldebug_loc0 # DW_AT_location
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.byte 7 # 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 76 # DW_AT_type
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.byte 0 # End Of Children Mark
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.byte 0 # End Of Children Mark
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.byte 0 # End Of Children Mark
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.section .debug_line,"",@progbits
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.Lline_table_start0:
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