[LLDB] Use path relative to binary for finding .dwo files.
DWARF allows .dwo file paths to be relative rather than absolute. When
they are relative, DWARF uses DW_AT_comp_dir to find the .dwo
file. DW_AT_comp_dir can also be relative, making the entire search
patch for the .dwo file relative. In this case, LLDB currently
searches relative to its current working directory, i.e. the directory
from which the debugger was launched. This is not right, as the
compiler, which generated the relative paths, can have no idea where
the debugger will be launched. The correct thing is to search relative
to the location of the executable binary. That is what this patch
does.
Differential Revision: https://reviews.llvm.org/D97786
GitOrigin-RevId: b241f3cb292d0ba1ad5a33b3bbd4a8a3a9c909dc
diff --git a/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
index 3a04f42..da17038 100644
--- a/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ b/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -1651,6 +1651,13 @@
return nullptr;
dwo_file.SetFile(comp_dir, FileSpec::Style::native);
+ if (dwo_file.IsRelative()) {
+ // if DW_AT_comp_dir is relative, it should be relative to the location
+ // of the executable, not to the location from which the debugger was
+ // launched.
+ dwo_file.PrependPathComponent(
+ m_objfile_sp->GetFileSpec().GetDirectory().GetStringRef());
+ }
FileSystem::Instance().Resolve(dwo_file);
dwo_file.AppendPathComponent(dwo_name);
}
diff --git a/test/Shell/SymbolFile/DWARF/dwo-relative-path.s b/test/Shell/SymbolFile/DWARF/dwo-relative-path.s
new file mode 100644
index 0000000..cc05434
--- /dev/null
+++ b/test/Shell/SymbolFile/DWARF/dwo-relative-path.s
@@ -0,0 +1,417 @@
+# Test to verify LLDB searches for dwos with relative paths relative to the
+# binary location, not relative to LLDB's launch location.
+
+# RUN: llvm-mc --filetype=obj --triple x86_64-pc-linux %s -o %t.o
+# RUN: llvm-objcopy --split-dwo=%T/dwo-relative-path.dwo %t.o
+
+# RUN: cd ../..
+
+# RUN: %lldb %t.o -o "target var x" -b 2>&1 | FileCheck %s
+
+# CHECK: x = 0
+
+ .text
+ .file "dwo-relative-path.cpp"
+ .file 0 "." "dwo-relative-path.cpp" md5 0xadc61d242247514c5d402d62db34b825
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main,@function
+main: # @main
+.Lfunc_begin0:
+ .loc 0 14 0 # dwo-relative-path.cpp:14:0
+ .cfi_startproc
+# %bb.0: # %entry
+ pushq %rbp
+ .cfi_def_cfa_offset 16
+ .cfi_offset %rbp, -16
+ movq %rsp, %rbp
+ .cfi_def_cfa_register %rbp
+ movl $0, -4(%rbp)
+ movl %edi, -8(%rbp)
+ movq %rsi, -16(%rbp)
+.Ltmp0:
+ .loc 0 15 8 prologue_end # dwo-relative-path.cpp:15:8
+ movw .L__const.main.y, %ax
+ movw %ax, -19(%rbp)
+ movb .L__const.main.y+2, %al
+ movb %al, -17(%rbp)
+ .loc 0 17 14 # dwo-relative-path.cpp:17:14
+ movsbl -19(%rbp), %eax
+ .loc 0 17 27 is_stmt 0 # dwo-relative-path.cpp:17:27
+ movsbl -18(%rbp), %ecx
+ .loc 0 17 19 # dwo-relative-path.cpp:17:19
+ addl %ecx, %eax
+ .loc 0 17 5 # dwo-relative-path.cpp:17:5
+ addl x, %eax
+ movl %eax, x
+ .loc 0 19 3 is_stmt 1 # dwo-relative-path.cpp:19:3
+ xorl %eax, %eax
+ popq %rbp
+ .cfi_def_cfa %rsp, 8
+ retq
+.Ltmp1:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+ # -- End function
+ .type x,@object # @x
+ .data
+ .globl x
+ .p2align 2
+x:
+ .long 10 # 0xa
+ .size x, 4
+
+ .type .L__const.main.y,@object # @__const.main.y
+ .section .rodata,"a",@progbits
+.L__const.main.y:
+ .ascii "abc"
+ .size .L__const.main.y, 3
+
+ .section .debug_abbrev,"",@progbits
+ .byte 1 # Abbreviation Code
+ .byte 74 # DW_TAG_skeleton_unit
+ .byte 0 # DW_CHILDREN_no
+ .byte 16 # DW_AT_stmt_list
+ .byte 23 # DW_FORM_sec_offset
+ .byte 114 # DW_AT_str_offsets_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 27 # DW_AT_comp_dir
+ .byte 37 # DW_FORM_strx1
+ .ascii "\264B" # DW_AT_GNU_pubnames
+ .byte 25 # DW_FORM_flag_present
+ .byte 118 # DW_AT_dwo_name
+ .byte 37 # DW_FORM_strx1
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 115 # DW_AT_addr_base
+ .byte 23 # DW_FORM_sec_offset
+ .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 5 # DWARF version number
+ .byte 4 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .quad 3752513468363206953
+ .byte 1 # Abbrev [1] 0x14:0x14 DW_TAG_skeleton_unit
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .byte 0 # DW_AT_comp_dir
+ # DW_AT_GNU_pubnames
+ .byte 1 # DW_AT_dwo_name
+ .byte 1 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"",@progbits
+ .long 12 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS",@progbits,1
+.Lskel_string0:
+ .asciz "." # string offset=0
+.Lskel_string1:
+ .asciz "dwo-relative-path.dwo" # string offset=2
+ .section .debug_str_offsets,"",@progbits
+ .long .Lskel_string0
+ .long .Lskel_string1
+ .section .debug_str_offsets.dwo,"e",@progbits
+ .long 48 # Length of String Offsets Set
+ .short 5
+ .short 0
+ .section .debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+ .asciz "x" # string offset=0
+.Linfo_string1:
+ .asciz "int" # string offset=2
+.Linfo_string2:
+ .asciz "main" # string offset=6
+.Linfo_string3:
+ .asciz "argc" # string offset=11
+.Linfo_string4:
+ .asciz "argv" # string offset=16
+.Linfo_string5:
+ .asciz "char" # string offset=21
+.Linfo_string6:
+ .asciz "y" # string offset=26
+.Linfo_string7:
+ .asciz "__ARRAY_SIZE_TYPE__" # string offset=28
+.Linfo_string8:
+ .asciz "clang version 13.0.0 (https://chromium.googlesource.com/external/github.com/llvm/llvm-project 6666e0d7a29c639df7a1652b6d3bf16f28edd45a)" # string offset=48
+.Linfo_string9:
+ .asciz "dwo-relative-path.cpp" # string offset=184
+.Linfo_string10:
+ .asciz "dwo-relative-path.dwo" # string offset=206
+ .section .debug_str_offsets.dwo,"e",@progbits
+ .long 0
+ .long 2
+ .long 6
+ .long 11
+ .long 16
+ .long 21
+ .long 26
+ .long 28
+ .long 48
+ .long 184
+ .long 206
+ .section .debug_info.dwo,"e",@progbits
+ .long .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit
+.Ldebug_info_dwo_start0:
+ .short 5 # DWARF version number
+ .byte 5 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long 0 # Offset Into Abbrev. Section
+ .quad 3752513468363206953
+ .byte 1 # Abbrev [1] 0x14:0x65 DW_TAG_compile_unit
+ .byte 8 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 9 # DW_AT_name
+ .byte 10 # DW_AT_dwo_name
+ .byte 2 # Abbrev [2] 0x1a:0xb DW_TAG_variable
+ .byte 0 # DW_AT_name
+ .long 37 # DW_AT_type
+ # DW_AT_external
+ .byte 0 # DW_AT_decl_file
+ .byte 11 # DW_AT_decl_line
+ .byte 2 # DW_AT_location
+ .byte 161
+ .byte 0
+ .byte 3 # Abbrev [3] 0x25:0x4 DW_TAG_base_type
+ .byte 1 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 4 # Abbrev [4] 0x29:0x31 DW_TAG_subprogram
+ .byte 1 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 86
+ .byte 2 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 13 # DW_AT_decl_line
+ .long 37 # DW_AT_type
+ # DW_AT_external
+ .byte 5 # Abbrev [5] 0x38:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 120
+ .byte 3 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 13 # DW_AT_decl_line
+ .long 37 # DW_AT_type
+ .byte 5 # Abbrev [5] 0x43:0xb DW_TAG_formal_parameter
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 112
+ .byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 13 # DW_AT_decl_line
+ .long 90 # DW_AT_type
+ .byte 6 # Abbrev [6] 0x4e:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 109
+ .byte 6 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 15 # DW_AT_decl_line
+ .long 104 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 7 # Abbrev [7] 0x5a:0x5 DW_TAG_pointer_type
+ .long 95 # DW_AT_type
+ .byte 7 # Abbrev [7] 0x5f:0x5 DW_TAG_pointer_type
+ .long 100 # DW_AT_type
+ .byte 3 # Abbrev [3] 0x64:0x4 DW_TAG_base_type
+ .byte 5 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 8 # Abbrev [8] 0x68:0xc DW_TAG_array_type
+ .long 100 # DW_AT_type
+ .byte 9 # Abbrev [9] 0x6d:0x6 DW_TAG_subrange_type
+ .long 116 # DW_AT_type
+ .byte 3 # DW_AT_count
+ .byte 0 # End Of Children Mark
+ .byte 10 # Abbrev [10] 0x74:0x4 DW_TAG_base_type
+ .byte 7 # DW_AT_name
+ .byte 8 # DW_AT_byte_size
+ .byte 7 # DW_AT_encoding
+ .byte 0 # End Of Children Mark
+.Ldebug_info_dwo_end0:
+ .section .debug_abbrev.dwo,"e",@progbits
+ .byte 1 # Abbreviation Code
+ .byte 17 # DW_TAG_compile_unit
+ .byte 1 # DW_CHILDREN_yes
+ .byte 37 # DW_AT_producer
+ .byte 37 # DW_FORM_strx1
+ .byte 19 # DW_AT_language
+ .byte 5 # DW_FORM_data2
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 118 # DW_AT_dwo_name
+ .byte 37 # DW_FORM_strx1
+ .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 37 # DW_FORM_strx1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # Abbreviation Code
+ .byte 36 # DW_TAG_base_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 4 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 64 # DW_AT_frame_base
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 63 # DW_AT_external
+ .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 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 6 # Abbreviation Code
+ .byte 52 # DW_TAG_variable
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 58 # DW_AT_decl_file
+ .byte 11 # DW_FORM_data1
+ .byte 59 # DW_AT_decl_line
+ .byte 11 # DW_FORM_data1
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 7 # 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 8 # Abbreviation Code
+ .byte 1 # DW_TAG_array_type
+ .byte 1 # DW_CHILDREN_yes
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 9 # Abbreviation Code
+ .byte 33 # DW_TAG_subrange_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 55 # DW_AT_count
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 10 # Abbreviation Code
+ .byte 36 # DW_TAG_base_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 11 # DW_AT_byte_size
+ .byte 11 # DW_FORM_data1
+ .byte 62 # DW_AT_encoding
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_addr,"",@progbits
+ .long .Ldebug_addr_end0-.Ldebug_addr_start0 # Length of contribution
+.Ldebug_addr_start0:
+ .short 5 # DWARF version number
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+.Laddr_table_base0:
+ .quad x
+ .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+ .section .debug_gnu_pubnames,"",@progbits
+ .long .LpubNames_end0-.LpubNames_start0 # Length of Public Names Info
+.LpubNames_start0:
+ .short 2 # DWARF Version
+ .long .Lcu_begin0 # Offset of Compilation Unit Info
+ .long 40 # Compilation Unit Length
+ .long 41 # DIE offset
+ .byte 48 # Attributes: FUNCTION, EXTERNAL
+ .asciz "main" # External Name
+ .long 26 # DIE offset
+ .byte 32 # Attributes: VARIABLE, EXTERNAL
+ .asciz "x" # External Name
+ .long 0 # End Mark
+.LpubNames_end0:
+ .section .debug_gnu_pubtypes,"",@progbits
+ .long .LpubTypes_end0-.LpubTypes_start0 # Length of Public Types Info
+.LpubTypes_start0:
+ .short 2 # DWARF Version
+ .long .Lcu_begin0 # Offset of Compilation Unit Info
+ .long 40 # Compilation Unit Length
+ .long 37 # DIE offset
+ .byte 144 # Attributes: TYPE, STATIC
+ .asciz "int" # External Name
+ .long 100 # DIE offset
+ .byte 144 # Attributes: TYPE, STATIC
+ .asciz "char" # External Name
+ .long 0 # End Mark
+.LpubTypes_end0:
+ .ident "clang version 13.0.0 (https://chromium.googlesource.com/external/github.com/llvm/llvm-project 6666e0d7a29c639df7a1652b6d3bf16f28edd45a)"
+ .section ".note.GNU-stack","",@progbits
+ .addrsig
+ .addrsig_sym x
+ .section .debug_line,"",@progbits
+.Lline_table_start0:
