This is an archive of the discontinued LLVM Phabricator instance.

Differential D127889

[LLDB] Handle DIE with DW_AT_low_pc and empty ranges
ClosedPublic

Authored by ayermolo on Jun 15 2022, 11:34 AM.

Details

Reviewers
jdoerfert
clayborg
Commits
rG130167ed1eff: [LLDB] Handle DIE with DW_AT_low_pc and empty ranges
Summary

The case comes out of how BOLT handles transformation of
DW_AT_low_pc/DW_AT_high_pc into DW_AT_low_pc/DW_AT_high_pc
with latter being 0.

Diff Detail

Event Timeline

ayermolo created this revision.Jun 15 2022, 11:34 AM
Herald added a project: Restricted Project. · View Herald TranscriptJun 15 2022, 11:34 AM
Herald added subscribers: hoy, modimo, wenlei. · View Herald Transcript
ayermolo requested review of this revision.Jun 15 2022, 11:34 AM
Herald added a reviewer: jdoerfert. · View Herald TranscriptJun 15 2022, 11:34 AM
Herald added a project: Restricted Project. · View Herald Transcript
Herald added subscribers: lldb-commits, sstefan1. · View Herald Transcript
ayermolo added a reviewer: clayborg.Jun 15 2022, 11:34 AM
Herald added subscribers: Michael137, JDevlieghere. · View Herald TranscriptJun 15 2022, 11:34 AM
Harbormaster completed remote builds in B170066: Diff 437268.Jun 15 2022, 11:37 AM
ayermolo mentioned this in D127897: [BOLT][DWARF] Handle range with same low_pc/high_pc.Jun 15 2022, 12:31 PM
clayborg accepted this revision.Jun 16 2022, 10:52 AM
This revision is now accepted and ready to land.Jun 16 2022, 10:52 AM
Closed by commit rG130167ed1eff: [LLDB] Handle DIE with DW_AT_low_pc and empty ranges (authored by ayermolo). · Explain WhyJun 22 2022, 10:55 AM
This revision was automatically updated to reflect the committed changes.
ayermolo added a commit: rG130167ed1eff: [LLDB] Handle DIE with DW_AT_low_pc and empty ranges.
DavidSpickett added a subscriber: DavidSpickett.Jun 23 2022, 3:44 AM

I've reverted this due to failures on our bots: https://lab.llvm.org/buildbot/#/builders/96/builds/25032/steps/6/logs/stdio

/usr/bin/ld: /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb/test/Shell/Commands/Output/dwarf5-low-pc-ranges-inlining.test.tmp.dir/main5.o: Relocations in generic ELF (EM: 62)
/usr/bin/ld: /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb/test/Shell/Commands/Output/dwarf5-low-pc-ranges-inlining.test.tmp.dir/main5.o: error adding symbols: file in wrong format
collect2: error: ld returned 1 exit status

I think that the system ld is expecting an AArch64 format object here. Perhaps you could use lld instead given that we always build that when running the lldb tests?

Also I'm pretty sure you'll need to require the x86 target in llvm as well. The test will fail if this is an AArch64 target only build for example.

ayermolo added a comment.Jun 23 2022, 6:52 AM
In D127889#3604421, @DavidSpickett wrote:

I've reverted this due to failures on our bots: https://lab.llvm.org/buildbot/#/builders/96/builds/25032/steps/6/logs/stdio

/usr/bin/ld: /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb/test/Shell/Commands/Output/dwarf5-low-pc-ranges-inlining.test.tmp.dir/main5.o: Relocations in generic ELF (EM: 62)
/usr/bin/ld: /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb/test/Shell/Commands/Output/dwarf5-low-pc-ranges-inlining.test.tmp.dir/main5.o: error adding symbols: file in wrong format
collect2: error: ld returned 1 exit status

I think that the system ld is expecting an AArch64 format object here. Perhaps you could use lld instead given that we always build that when running the lldb tests?

Also I'm pretty sure you'll need to require the x86 target in llvm as well. The test will fail if this is an AArch64 target only build for example.

Ah thanks. Will make changes.

labath added a subscriber: labath.Jun 23 2022, 11:55 PM

It should be sufficient to replace the %clang line with the appropriate ld.lld equivalent, and replace REQUIRES: system-linux with REQUIRES: lld.

Also it test/Shell/SymbolFile/DWARF would be a better place for this test (and it also includes some tests that you can take inspiration from).

Revision Contents

PathSize
lldb/
source/
Plugins/
SymbolFile/
DWARF/
2 lines
test/
Shell/
Commands/
Inputs/
369 lines
429 lines
13 lines
13 lines

Diff 439095

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

Show First 20 Lines • Show All 1,273 Lines • ▼ Show 20 Lines case DW_TAG_lexical_block: {
if (subprogram_low_pc == LLDB_INVALID_ADDRESS) { if (subprogram_low_pc == LLDB_INVALID_ADDRESS) {
subprogram_low_pc = ranges.GetMinRangeBase(0); subprogram_low_pc = ranges.GetMinRangeBase(0);
} }
} }
const size_t num_ranges = ranges.GetSize(); const size_t num_ranges = ranges.GetSize();
for (size_t i = 0; i < num_ranges; ++i) { for (size_t i = 0; i < num_ranges; ++i) {
const DWARFRangeList::Entry &range = ranges.GetEntryRef(i); const DWARFRangeList::Entry &range = ranges.GetEntryRef(i);
if (range.GetByteSize() == 0)
continue;
const addr_t range_base = range.GetRangeBase(); const addr_t range_base = range.GetRangeBase();
if (range_base >= subprogram_low_pc) if (range_base >= subprogram_low_pc)
block->AddRange(Block::Range(range_base - subprogram_low_pc, block->AddRange(Block::Range(range_base - subprogram_low_pc,
range.GetByteSize())); range.GetByteSize()));
else { else {
GetObjectFile()->GetModule()->ReportError( GetObjectFile()->GetModule()->ReportError(
"0x%8.8" PRIx64 ": adding range [0x%" PRIx64 "-0x%" PRIx64 "0x%8.8" PRIx64 ": adding range [0x%" PRIx64 "-0x%" PRIx64
") which has a base that is less than the function's low PC " ") which has a base that is less than the function's low PC "
▲ Show 20 Lines • Show All 2,804 Lines • Show Last 20 Lines

lldb/test/Shell/Commands/Inputs/dwarf4-low-pc-ranges-inlining.s

  • This file was added.
# Manually modified to have DW_AT_ranges point to end list.
# int helper(int i) {
# return ++i;
# }
#
# int main(int argc, char *argv[]) {
# return helper(argc);
# }
# Manually modified DW_TAG_inlined_subroutine to have DW_AT_low_pc with value 0,
# and DW_AT_ranges to point to end ranges list.
.text
.file "main.cpp"
.section .text._Z6helperi,"ax",@progbits
.globl _Z6helperi # -- Begin function _Z6helperi
.p2align 4, 0x90
.type _Z6helperi,@function
_Z6helperi: # @_Z6helperi
.Lfunc_begin0:
.file 1 "/home/test" "main.cpp"
.loc 1 1 0 # main.cpp:1:0
.cfi_startproc
# %bb.0: # %entry
#DEBUG_VALUE: helper:i <- $edi
# kill: def $edi killed $edi def $rdi
.loc 1 2 10 prologue_end # main.cpp:2:10
leal 1(%rdi), %eax
.Ltmp0:
#DEBUG_VALUE: helper:i <- $eax
.loc 1 2 3 is_stmt 0 # main.cpp:2:3
retq
.Ltmp1:
.Lfunc_end0:
.size _Z6helperi, .Lfunc_end0-_Z6helperi
.cfi_endproc
# -- End function
.section .text.main,"ax",@progbits
.globl main # -- Begin function main
.p2align 4, 0x90
.type main,@function
main: # @main
.Lfunc_begin1:
.loc 1 5 0 is_stmt 1 # main.cpp:5:0
.cfi_startproc
# %bb.0: # %entry
#DEBUG_VALUE: main:argc <- $edi
#DEBUG_VALUE: main:argv <- $rsi
#DEBUG_VALUE: helper:i <- $edi
# kill: def $edi killed $edi def $rdi
.loc 1 2 10 prologue_end # main.cpp:2:10
leal 1(%rdi), %eax
.Ltmp2:
#DEBUG_VALUE: helper:i <- $eax
.loc 1 6 3 # main.cpp:6:3
retq
.Ltmp3:
.Lfunc_end1:
.size main, .Lfunc_end1-main
.cfi_endproc
# -- End function
.section .debug_loc,"",@progbits
.Ldebug_loc0:
.quad -1
.quad .Lfunc_begin0 # base address
.quad .Lfunc_begin0-.Lfunc_begin0
.quad .Ltmp0-.Lfunc_begin0
.short 1 # Loc expr size
.byte 85 # super-register DW_OP_reg5
.quad .Ltmp0-.Lfunc_begin0
.quad .Lfunc_end0-.Lfunc_begin0
.short 1 # Loc expr size
.byte 80 # super-register DW_OP_reg0
.quad 0
.quad 0
.Ldebug_loc1:
.quad -1
.quad .Lfunc_begin1 # base address
.quad .Lfunc_begin1-.Lfunc_begin1
.quad .Ltmp2-.Lfunc_begin1
.short 1 # Loc expr size
.byte 85 # super-register DW_OP_reg5
.quad .Ltmp2-.Lfunc_begin1
.quad .Lfunc_end1-.Lfunc_begin1
.short 1 # Loc expr size
.byte 80 # super-register DW_OP_reg0
.quad 0
.quad 0
.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 14 # DW_FORM_strp
.byte 19 # DW_AT_language
.byte 5 # DW_FORM_data2
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.byte 16 # DW_AT_stmt_list
.byte 23 # DW_FORM_sec_offset
.byte 27 # DW_AT_comp_dir
.byte 14 # DW_FORM_strp
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 85 # DW_AT_ranges
.byte 23 # DW_FORM_sec_offset
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # 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
.ascii "\227B" # DW_AT_GNU_all_call_sites
.byte 25 # DW_FORM_flag_present
.byte 49 # DW_AT_abstract_origin
.byte 19 # DW_FORM_ref4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 3 # Abbreviation Code
.byte 5 # DW_TAG_formal_parameter
.byte 0 # DW_CHILDREN_no
.byte 2 # DW_AT_location
.byte 23 # DW_FORM_sec_offset
.byte 49 # DW_AT_abstract_origin
.byte 19 # DW_FORM_ref4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 4 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 1 # DW_CHILDREN_yes
.byte 110 # DW_AT_linkage_name
.byte 14 # DW_FORM_strp
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.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 32 # DW_AT_inline
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 5 # Abbreviation Code
.byte 5 # DW_TAG_formal_parameter
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.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 36 # DW_TAG_base_type
.byte 0 # DW_CHILDREN_no
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.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 7 # 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
.ascii "\227B" # DW_AT_GNU_all_call_sites
.byte 25 # DW_FORM_flag_present
.byte 3 # DW_AT_name
.byte 14 # DW_FORM_strp
.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 8 # 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 14 # DW_FORM_strp
.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 9 # Abbreviation Code
.byte 29 # DW_TAG_inlined_subroutine
.byte 1 # DW_CHILDREN_yes
.byte 49 # DW_AT_abstract_origin
.byte 19 # DW_FORM_ref4
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 85 # DW_AT_ranges
.byte 23 # DW_FORM_sec_offset
.byte 88 # DW_AT_call_file
.byte 11 # DW_FORM_data1
.byte 89 # DW_AT_call_line
.byte 11 # DW_FORM_data1
.byte 87 # DW_AT_call_column
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 10 # 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 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] 0xb:0xc3 DW_TAG_compile_unit
.long .Linfo_string0 # DW_AT_producer
.short 33 # DW_AT_language
.long .Linfo_string1 # DW_AT_name
.long .Lline_table_start0 # DW_AT_stmt_list
.long .Linfo_string2 # DW_AT_comp_dir
.quad 0 # DW_AT_low_pc
.long .Ldebug_ranges0 # DW_AT_ranges
.byte 2 # Abbrev [2] 0x2a:0x1d DW_TAG_subprogram
.quad .Lfunc_begin0 # DW_AT_low_pc
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 87
# DW_AT_GNU_all_call_sites
.long 71 # DW_AT_abstract_origin
.byte 3 # Abbrev [3] 0x3d:0x9 DW_TAG_formal_parameter
.long .Ldebug_loc0 # DW_AT_location
.long 87 # DW_AT_abstract_origin
.byte 0 # End Of Children Mark
.byte 4 # Abbrev [4] 0x47:0x1c DW_TAG_subprogram
.long .Linfo_string3 # DW_AT_linkage_name
.long .Linfo_string4 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 1 # DW_AT_decl_line
.long 99 # DW_AT_type
# DW_AT_external
.byte 1 # DW_AT_inline
.byte 5 # Abbrev [5] 0x57:0xb DW_TAG_formal_parameter
.long .Linfo_string6 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 1 # DW_AT_decl_line
.long 99 # DW_AT_type
.byte 0 # End Of Children Mark
.byte 6 # Abbrev [6] 0x63:0x7 DW_TAG_base_type
.long .Linfo_string5 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size
.byte 7 # Abbrev [7] 0x6a:0x52 DW_TAG_subprogram
.quad .Lfunc_begin1 # DW_AT_low_pc
.long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 87
# DW_AT_GNU_all_call_sites
.long .Linfo_string7 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 5 # DW_AT_decl_line
.long 99 # DW_AT_type
# DW_AT_external
.byte 8 # Abbrev [8] 0x83:0xd DW_TAG_formal_parameter
.byte 1 # DW_AT_location
.byte 85
.long .Linfo_string8 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 5 # DW_AT_decl_line
.long 99 # DW_AT_type
.byte 8 # Abbrev [8] 0x90:0xd DW_TAG_formal_parameter
.byte 1 # DW_AT_location
.byte 84
.long .Linfo_string9 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 5 # DW_AT_decl_line
.long 188 # DW_AT_type
.byte 9 # Abbrev [9] 0x9d:0x1e DW_TAG_inlined_subroutine
.long 71 # DW_AT_abstract_origin
.quad 0 # DW_AT_low_pc
.long .Ldebug_ranges1 # DW_AT_ranges
.byte 1 # DW_AT_call_file
.byte 6 # DW_AT_call_line
.byte 10 # DW_AT_call_column
.byte 3 # Abbrev [3] 0xb1:0x9 DW_TAG_formal_parameter
.long .Ldebug_loc1 # DW_AT_location
.long 87 # DW_AT_abstract_origin
.byte 0 # End Of Children Mark
.byte 0 # End Of Children Mark
.byte 10 # Abbrev [10] 0xbc:0x5 DW_TAG_pointer_type
.long 193 # DW_AT_type
.byte 10 # Abbrev [10] 0xc1:0x5 DW_TAG_pointer_type
.long 198 # DW_AT_type
.byte 6 # Abbrev [6] 0xc6:0x7 DW_TAG_base_type
.long .Linfo_string10 # DW_AT_name
.byte 6 # DW_AT_encoding
.byte 1 # DW_AT_byte_size
.byte 0 # End Of Children Mark
.Ldebug_info_end0:
.section .debug_ranges,"",@progbits
.Ldebug_ranges0:
.quad .Lfunc_begin0
.quad .Lfunc_end0
.quad .Lfunc_begin1
.quad .Lfunc_end1
.quad 0
.quad 0
.Ldebug_ranges1:
.quad 0
.quad 0
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "clang version 15.0.0" # string offset=0
.Linfo_string1:
.asciz "main.cpp" # string offset=105
.Linfo_string2:
.asciz "/home/test" # string offset=114
.Linfo_string3:
.asciz "_Z6helperi" # string offset=152
.Linfo_string4:
.asciz "helper" # string offset=163
.Linfo_string5:
.asciz "int" # string offset=170
.Linfo_string6:
.asciz "i" # string offset=174
.Linfo_string7:
.asciz "main" # string offset=176
.Linfo_string8:
.asciz "argc" # string offset=181
.Linfo_string9:
.asciz "argv" # string offset=186
.Linfo_string10:
.asciz "char" # string offset=191
.ident "clang version 15.0.0"
.section ".note.GNU-stack","",@progbits
.addrsig
.section .debug_line,"",@progbits
.Lline_table_start0:

lldb/test/Shell/Commands/Inputs/dwarf5-low-pc-ranges-inlining.s

  • This file was added.
# Manually modified to have DW_AT_ranges point to end list.
# int helper(int i) {
# return ++i;
# }
#
# int main(int argc, char *argv[]) {
# return helper(argc);
# }
.text
.file "main.cpp"
.section .text._Z6helperi,"ax",@progbits
.globl _Z6helperi # -- Begin function _Z6helperi
.p2align 4, 0x90
.type _Z6helperi,@function
_Z6helperi: # @_Z6helperi
.Lfunc_begin0:
.file 0 "/home/test" "main.cpp" md5 0x3fc4870015f8bb98cd719b92f3dca96e
.loc 0 1 0 # main.cpp:1:0
.cfi_startproc
# %bb.0: # %entry
#DEBUG_VALUE: helper:i <- $edi
# kill: def $edi killed $edi def $rdi
.loc 0 2 10 prologue_end # main.cpp:2:10
leal 1(%rdi), %eax
.Ltmp0:
#DEBUG_VALUE: helper:i <- $eax
.loc 0 2 3 is_stmt 0 # main.cpp:2:3
retq
.Ltmp1:
.Lfunc_end0:
.size _Z6helperi, .Lfunc_end0-_Z6helperi
.cfi_endproc
# -- End function
.section .text.main,"ax",@progbits
.globl main # -- Begin function main
.p2align 4, 0x90
.type main,@function
main: # @main
.Lfunc_begin1:
.loc 0 5 0 is_stmt 1 # main.cpp:5:0
.cfi_startproc
# %bb.0: # %entry
#DEBUG_VALUE: main:argc <- $edi
#DEBUG_VALUE: main:argv <- $rsi
#DEBUG_VALUE: helper:i <- $edi
# kill: def $edi killed $edi def $rdi
.loc 0 2 10 prologue_end # main.cpp:2:10
leal 1(%rdi), %eax
.Ltmp2:
#DEBUG_VALUE: helper:i <- $eax
.loc 0 6 3 # main.cpp:6:3
retq
.Ltmp3:
.Lfunc_end1:
.size main, .Lfunc_end1-main
.cfi_endproc
# -- End function
.section .debug_loclists,"",@progbits
.long .Ldebug_list_header_end0-.Ldebug_list_header_start0 # Length
.Ldebug_list_header_start0:
.short 5 # Version
.byte 8 # Address size
.byte 0 # Segment selector size
.long 2 # Offset entry count
.Lloclists_table_base0:
.long .Ldebug_loc0-.Lloclists_table_base0
.long .Ldebug_loc1-.Lloclists_table_base0
.Ldebug_loc0:
.byte 1 # DW_LLE_base_addressx
.byte 0 # base address index
.byte 4 # DW_LLE_offset_pair
.uleb128 .Lfunc_begin0-.Lfunc_begin0 # starting offset
.uleb128 .Ltmp0-.Lfunc_begin0 # ending offset
.byte 1 # Loc expr size
.byte 85 # super-register DW_OP_reg5
.byte 4 # DW_LLE_offset_pair
.uleb128 .Ltmp0-.Lfunc_begin0 # starting offset
.uleb128 .Lfunc_end0-.Lfunc_begin0 # ending offset
.byte 1 # Loc expr size
.byte 80 # super-register DW_OP_reg0
.byte 0 # DW_LLE_end_of_list
.Ldebug_loc1:
.byte 1 # DW_LLE_base_addressx
.byte 1 # base address index
.byte 4 # DW_LLE_offset_pair
.uleb128 .Lfunc_begin1-.Lfunc_begin1 # starting offset
.uleb128 .Ltmp2-.Lfunc_begin1 # ending offset
.byte 1 # Loc expr size
.byte 85 # super-register DW_OP_reg5
.byte 4 # DW_LLE_offset_pair
.uleb128 .Ltmp2-.Lfunc_begin1 # starting offset
.uleb128 .Lfunc_end1-.Lfunc_begin1 # ending offset
.byte 1 # Loc expr size
.byte 80 # super-register DW_OP_reg0
.byte 0 # DW_LLE_end_of_list
.Ldebug_list_header_end0:
.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 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 114 # DW_AT_str_offsets_base
.byte 23 # DW_FORM_sec_offset
.byte 16 # DW_AT_stmt_list
.byte 23 # DW_FORM_sec_offset
.byte 27 # DW_AT_comp_dir
.byte 37 # DW_FORM_strx1
.byte 17 # DW_AT_low_pc
.byte 1 # DW_FORM_addr
.byte 85 # DW_AT_ranges
.byte 35 # DW_FORM_rnglistx
.byte 115 # DW_AT_addr_base
.byte 23 # DW_FORM_sec_offset
.byte 116 # DW_AT_rnglists_base
.byte 23 # DW_FORM_sec_offset
.ascii "\214\001" # DW_AT_loclists_base
.byte 23 # DW_FORM_sec_offset
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 2 # 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 122 # DW_AT_call_all_calls
.byte 25 # DW_FORM_flag_present
.byte 49 # DW_AT_abstract_origin
.byte 19 # DW_FORM_ref4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 3 # Abbreviation Code
.byte 5 # DW_TAG_formal_parameter
.byte 0 # DW_CHILDREN_no
.byte 2 # DW_AT_location
.byte 34 # DW_FORM_loclistx
.byte 49 # DW_AT_abstract_origin
.byte 19 # DW_FORM_ref4
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 4 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 1 # DW_CHILDREN_yes
.byte 110 # DW_AT_linkage_name
.byte 37 # DW_FORM_strx1
.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 32 # DW_AT_inline
.byte 33 # DW_FORM_implicit_const
.byte 1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 5 # Abbreviation Code
.byte 5 # DW_TAG_formal_parameter
.byte 0 # DW_CHILDREN_no
.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 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 7 # 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 122 # DW_AT_call_all_calls
.byte 25 # DW_FORM_flag_present
.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 8 # 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 9 # Abbreviation Code
.byte 29 # DW_TAG_inlined_subroutine
.byte 1 # DW_CHILDREN_yes
.byte 49 # DW_AT_abstract_origin
.byte 19 # DW_FORM_ref4
.byte 17 # DW_AT_low_pc
.byte 27 # DW_FORM_addrx
.byte 85 # DW_AT_ranges
.byte 35 # DW_FORM_rnglistx
.byte 88 # DW_AT_call_file
.byte 11 # DW_FORM_data1
.byte 89 # DW_AT_call_line
.byte 11 # DW_FORM_data1
.byte 87 # DW_AT_call_column
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 10 # 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 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 1 # DWARF Unit Type
.byte 8 # Address Size (in bytes)
.long .debug_abbrev # Offset Into Abbrev. Section
.byte 1 # Abbrev [1] 0xc:0x93 DW_TAG_compile_unit
.byte 0 # DW_AT_producer
.short 33 # DW_AT_language
.byte 1 # DW_AT_name
.long .Lstr_offsets_base0 # DW_AT_str_offsets_base
.long .Lline_table_start0 # DW_AT_stmt_list
.byte 2 # DW_AT_comp_dir
.quad 0 # DW_AT_low_pc
.byte 0 # DW_AT_ranges
.long .Laddr_table_base0 # DW_AT_addr_base
.long .Lrnglists_table_base0 # DW_AT_rnglists_base
.long .Lloclists_table_base0 # DW_AT_loclists_base
.byte 2 # Abbrev [2] 0x2f:0x13 DW_TAG_subprogram
.byte 0 # DW_AT_low_pc
.long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 87
# DW_AT_call_all_calls
.long 66 # DW_AT_abstract_origin
.byte 3 # Abbrev [3] 0x3b:0x6 DW_TAG_formal_parameter
.byte 0 # DW_AT_location
.long 75 # DW_AT_abstract_origin
.byte 0 # End Of Children Mark
.byte 4 # Abbrev [4] 0x42:0x12 DW_TAG_subprogram
.byte 3 # DW_AT_linkage_name
.byte 4 # DW_AT_name
.byte 0 # DW_AT_decl_file
.byte 1 # DW_AT_decl_line
.long 84 # DW_AT_type
# DW_AT_external
# DW_AT_inline
.byte 5 # Abbrev [5] 0x4b:0x8 DW_TAG_formal_parameter
.byte 6 # DW_AT_name
.byte 0 # DW_AT_decl_file
.byte 1 # DW_AT_decl_line
.long 84 # DW_AT_type
.byte 0 # End Of Children Mark
.byte 6 # Abbrev [6] 0x54:0x4 DW_TAG_base_type
.byte 5 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size
.byte 7 # Abbrev [7] 0x58:0x38 DW_TAG_subprogram
.byte 1 # DW_AT_low_pc
.long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 87
# DW_AT_call_all_calls
.byte 7 # DW_AT_name
.byte 0 # DW_AT_decl_file
.byte 5 # DW_AT_decl_line
.long 84 # DW_AT_type
# DW_AT_external
.byte 8 # Abbrev [8] 0x67:0xa DW_TAG_formal_parameter
.byte 1 # DW_AT_location
.byte 85
.byte 8 # DW_AT_name
.byte 0 # DW_AT_decl_file
.byte 5 # DW_AT_decl_line
.long 84 # DW_AT_type
.byte 8 # Abbrev [8] 0x71:0xa DW_TAG_formal_parameter
.byte 1 # DW_AT_location
.byte 84
.byte 9 # DW_AT_name
.byte 0 # DW_AT_decl_file
.byte 5 # DW_AT_decl_line
.long 144 # DW_AT_type
.byte 9 # Abbrev [9] 0x7b:0x14 DW_TAG_inlined_subroutine
.long 66 # DW_AT_abstract_origin
.byte 2 # DW_AT_low_pc
.byte 1 # DW_AT_ranges
.byte 0 # DW_AT_call_file
.byte 6 # DW_AT_call_line
.byte 10 # DW_AT_call_column
.byte 3 # Abbrev [3] 0x88:0x6 DW_TAG_formal_parameter
.byte 1 # DW_AT_location
.long 75 # DW_AT_abstract_origin
.byte 0 # End Of Children Mark
.byte 0 # End Of Children Mark
.byte 10 # Abbrev [10] 0x90:0x5 DW_TAG_pointer_type
.long 149 # DW_AT_type
.byte 10 # Abbrev [10] 0x95:0x5 DW_TAG_pointer_type
.long 154 # DW_AT_type
.byte 6 # Abbrev [6] 0x9a:0x4 DW_TAG_base_type
.byte 10 # DW_AT_name
.byte 6 # DW_AT_encoding
.byte 1 # DW_AT_byte_size
.byte 0 # End Of Children Mark
.Ldebug_info_end0:
.section .debug_rnglists,"",@progbits
.long .Ldebug_list_header_end1-.Ldebug_list_header_start1 # Length
.Ldebug_list_header_start1:
.short 5 # Version
.byte 8 # Address size
.byte 0 # Segment selector size
.long 2 # Offset entry count
.Lrnglists_table_base0:
.long .Ldebug_ranges0-.Lrnglists_table_base0
.long .Ldebug_ranges1-.Lrnglists_table_base0
.Ldebug_ranges0:
.byte 3 # DW_RLE_startx_length
.byte 0 # start index
.uleb128 .Lfunc_end0-.Lfunc_begin0 # length
.byte 3 # DW_RLE_startx_length
.byte 1 # start index
.uleb128 .Lfunc_end1-.Lfunc_begin1 # length
.byte 0 # DW_RLE_end_of_list
.Ldebug_ranges1:
.byte 0 # DW_RLE_end_of_list
.Ldebug_list_header_end1:
.section .debug_str_offsets,"",@progbits
.long 48 # Length of String Offsets Set
.short 5
.short 0
.Lstr_offsets_base0:
.section .debug_str,"MS",@progbits,1
.Linfo_string0:
.asciz "clang version 15.0.0" # string offset=0
.Linfo_string1:
.asciz "main.cpp" # string offset=134
.Linfo_string2:
.asciz "/home/test" # string offset=143
.Linfo_string3:
.asciz "_Z6helperi" # string offset=181
.Linfo_string4:
.asciz "helper" # string offset=192
.Linfo_string5:
.asciz "int" # string offset=199
.Linfo_string6:
.asciz "i" # string offset=203
.Linfo_string7:
.asciz "main" # string offset=205
.Linfo_string8:
.asciz "argc" # string offset=210
.Linfo_string9:
.asciz "argv" # string offset=215
.Linfo_string10:
.asciz "char" # string offset=220
.section .debug_str_offsets,"",@progbits
.long .Linfo_string0
.long .Linfo_string1
.long .Linfo_string2
.long .Linfo_string3
.long .Linfo_string4
.long .Linfo_string5
.long .Linfo_string6
.long .Linfo_string7
.long .Linfo_string8
.long .Linfo_string9
.long .Linfo_string10
.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 .Lfunc_begin0
.quad .Lfunc_begin1
.quad 0
.Ldebug_addr_end0:
.ident "clang version 15.0.0"
.section ".note.GNU-stack","",@progbits
.addrsig
.section .debug_line,"",@progbits
.Lline_table_start0:

lldb/test/Shell/Commands/dwarf4-low-pc-ranges-inlining.test

  • This file was added.
# REQUIRES: system-linux
# RUN: rm -rf %t.dir
# RUN: mkdir %t.dir
# RUN: cd %t.dir
# RUN: llvm-mc -dwarf-version=4 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf4-low-pc-ranges-inlining.s -o %t.dir/main4.o
# RUN: %clang %t.dir/main4.o -o %t.dir/main4.exe
# RUN: %lldb -b -o 'b main' %t.dir/main4.exe &> %t.dir/output.txt
# RUN: cat %t.dir/output.txt | FileCheck %s
# Test checks lldb handles a case of a DIE with DW_AT_low_pc with 0x0 address, and DW_AT_ranges that point to end of list.
# CHECK-NOT: error: main4.exe
# CHECK: Breakpoint 1: where

lldb/test/Shell/Commands/dwarf5-low-pc-ranges-inlining.test

  • This file was added.
# REQUIRES: system-linux
# RUN: rm -rf %t.dir
# RUN: mkdir %t.dir
# RUN: cd %t.dir
# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-low-pc-ranges-inlining.s -o %t.dir/main5.o
# RUN: %clang %t.dir/main5.o -o %t.dir/main5.exe
# RUN: %lldb -b -o 'b main' %t.dir/main5.exe &> %t.dir/output.txt
# RUN: cat %t.dir/output.txt | FileCheck %s
# Test checks lldb handles a case of a DIE with DW_AT_low_pc with 0x0 address, and DW_AT_ranges that point to end of list.
# CHECK-NOT: error: main5.exe
# CHECK: Breakpoint 1: where