a136699b2a
Current user_id_t format is:
63{isDebugTypes} 62..32{dwo || 7fffffff}
31..0 {die_offset}
while current DIERef format is (I have made up the bit positions but the
field widths do match):
63{m_section==isDebugTypes} 62{m_dwo_num_valid} 61..32{m_dwo_num}
31..0 {m_die_offset}
Proposing to change user_id_t to:
63{isDebugTypes} 62{dwo_is_valid} 61..32{dwo; 0 if !valid}
31..0 {die_offset}
There is no benefit of having 31-bits wide dwo_num in user_id_t when it
gets converted to 30-bits width in DIERef.
This patch is for future DWZ patchset which extends the dwo_is_valid bit
into a 2-bit field (normal, DWO, DWZ, DWZcommon) so that both user_id_t
and DIERef can be changed then the same way.
It would be best to somehow unify user_id_t and DIERef but I do not plan
to do that. user_id_t should probably remain a number for the Python API
compatibility while there still needs to be some class with all the
methods to access it.
SymbolFileDWARF::GetDwpSymbolFile() and SymbolFileDWARF::GetDIE use
0x3fffffff for DWP but that does not clash:
formerly:
31bits32..62:0x7fffffff = normal unit / not any DWO
31bits32..62:0x3fffffff = DWP
31bits32..62:others = DWO unit number
after this patch:
bit62=0 30bits32..61:any = normal unit / not any DWO
bit62=1 30bits32..61:0x3fffffff = DWP
bit62=1 30bits32..61:others = DWO unit number
Differential Revision: https://reviews.llvm.org/D90413
81 lines
3.7 KiB
ArmAsm
81 lines
3.7 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -triple=x86_64-pc-linux -filetype=obj %s > %t
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# RUN: %lldb %t -o "image lookup -v -s lookup_ranges" -o exit 2>&1 | FileCheck %s
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# CHECK: DIE has DW_AT_ranges(0x47) attribute, but range extraction failed (No debug_ranges section),
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# CHECK: Function: id = {0x0000001c}, name = "ranges", range = [0x0000000000000000-0x0000000000000004)
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# CHECK: Blocks: id = {0x0000001c}, range = [0x00000000-0x00000004)
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.text
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.p2align 12
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.globl ranges
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.type ranges,@function
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ranges: # @ranges
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nop
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lookup_ranges:
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nop
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nop
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nop
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.Lranges_end:
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.size ranges, .Lranges_end-ranges
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# -- End function
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.section .debug_str,"MS",@progbits,1
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.Lproducer:
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.asciz "Hand-written DWARF"
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.Lranges:
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.asciz "ranges"
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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 14 # DW_FORM_strp
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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 3 # DW_AT_name
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.byte 14 # DW_FORM_strp
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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 11 # DW_TAG_lexical_block
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.byte 0 # DW_CHILDREN_no
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.byte 85 # DW_AT_ranges
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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 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 4 # DWARF version number
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.long .debug_abbrev # Offset Into Abbrev. Section
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.byte 8 # Address Size (in bytes)
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.byte 1 # Abbrev [1] 0xb:0x7b DW_TAG_compile_unit
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.long .Lproducer # DW_AT_producer
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.quad ranges # DW_AT_low_pc
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.long .Lranges_end-ranges # DW_AT_high_pc
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.byte 2 # Abbrev [2] 0x2a:0x4d DW_TAG_subprogram
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.quad ranges # DW_AT_low_pc
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.long .Lranges_end-ranges # DW_AT_high_pc
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.long .Lranges # DW_AT_name
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.byte 5 # Abbrev [5] 0x61:0x15 DW_TAG_lexical_block
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.long 0x47 # DW_AT_ranges
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.byte 0 # End Of Children Mark
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.byte 0 # End Of Children Mark
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.Ldebug_info_end0:
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