[lldb/DWARF] Fix DW_AT_rnglists_base handling for dwo files

the value of DW_AT_rnglists_base of the skeleton unit is for that unit
alone (e.g. used in DW_AT_ranges of the unit DIE) and should not apply
to the split unit.

The split unit has a hardcoded range list base value -- we should
initialize range list code whenever we detect a nonempty
debug_rnglists.dwo section.

1 files changed, 156 insertions, 0 deletions

diff --git a/lldb/test/Shell/SymbolFile/DWARF/debug_rnglists-dwo.s b/lldb/test/Shell/SymbolFile/DWARF/debug_rnglists-dwo.s
new file mode 100644
index 00000000000..17ed6a76b7e
--- /dev/null
+++ b/lldb/test/Shell/SymbolFile/DWARF/debug_rnglists-dwo.s
@@ -0,0 +1,156 @@
+# REQUIRES: x86
+
+# RUN: cd %T
+# RUN: llvm-mc -triple=x86_64-pc-linux -filetype=obj %s >debug_rnglists-dwo.o
+# RUN: %lldb debug_rnglists-dwo.o -o "image lookup -v -s lookup_rnglists" \
+# RUN:   -o exit | FileCheck %s
+
+# CHECK-LABEL: image lookup -v -s lookup_rnglists
+# CHECK:  Function: id = {0x00000028}, name = "rnglists", range = [0x0000000000000000-0x0000000000000003)
+# CHECK:    Blocks: id = {0x00000028}, range = [0x00000000-0x00000003)
+# CHECK-NEXT:       id = {0x00000037}, range = [0x00000001-0x00000002)
+
+        .text
+rnglists:
+        nop
+.Lblock1_begin:
+lookup_rnglists:
+        nop
+.Lblock1_end:
+        nop
+.Lrnglists_end:
+
+        .section        .debug_abbrev,"",@progbits
+        .byte   1                       # Abbreviation Code
+        .byte   17                      # DW_TAG_compile_unit
+        .byte   0                       # DW_CHILDREN_no
+        .byte   0x76                    # DW_AT_dwo_name
+        .byte   8                       # DW_FORM_string
+        .byte   115                     # DW_AT_addr_base
+        .byte   23                      # DW_FORM_sec_offset
+        .byte   85                      # DW_AT_ranges
+        .byte   35                      # DW_FORM_rnglistx
+        .byte   116                     # DW_AT_rnglists_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   0xdeadbeefbaadf00d      # DWO id
+        .byte   1                       # Abbrev [1] 0xc:0x5f DW_TAG_compile_unit
+        .asciz  "debug_rnglists-dwo.o"  # DW_AT_dwo_name
+        .long   .Laddr_table_base0      # DW_AT_addr_base
+        .byte   0                       # DW_AT_ranges
+        .long   .Lskel_rnglists_table_base # DW_AT_rnglists_base
+.Ldebug_info_end0:
+
+        .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   rnglists
+        .quad   .Lblock1_begin
+.Ldebug_addr_end0:
+
+        .section        .debug_rnglists,"",@progbits
+        # A fake rnglists contribution so that range list bases for the skeleton
+        # and split units differ.
+        .long   .Lfake_rnglist_table_end-.Lfake_rnglist_table_start # Length
+.Lfake_rnglist_table_start:
+        .short  5                       # Version
+        .byte   8                       # Address size
+        .byte   0                       # Segment selector size
+        .long   0                       # Offset entry count
+.Lfake_rnglists_table_base:
+.Lfake_rnglist_table_end:
+
+        .long   .Lskel_rnglist_table_end-.Lskel_rnglist_table_start # Length
+.Lskel_rnglist_table_start:
+        .short  5                       # Version
+        .byte   8                       # Address size
+        .byte   0                       # Segment selector size
+        .long   1                       # Offset entry count
+.Lskel_rnglists_table_base:
+        .long   .Lskel_ranges0-.Lskel_rnglists_table_base
+.Lskel_ranges0:
+        .byte   7                       # DW_RLE_start_length
+        .quad   rnglists
+        .uleb128   .Lrnglists_end-rnglists
+        .byte   0                       # DW_RLE_end_of_list
+.Lskel_rnglist_table_end:
+
+        .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   8                       # DW_FORM_string
+        .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   3                       # DW_AT_name
+        .byte   8                       # DW_FORM_string
+        .byte   0                       # EOM(1)
+        .byte   0                       # EOM(2)
+        .byte   5                       # Abbreviation Code
+        .byte   11                      # DW_TAG_lexical_block
+        .byte   0                       # DW_CHILDREN_no
+        .byte   85                      # DW_AT_ranges
+        .byte   35                      # DW_FORM_rnglistx
+        .byte   0                       # EOM(1)
+        .byte   0                       # EOM(2)
+        .byte   0                       # EOM(3)
+
+        .section        .debug_info.dwo,"e",@progbits
+.Lcu_begin1:
+        .long   .Ldebug_info_end1-.Ldebug_info_start1 # Length of Unit
+.Ldebug_info_start1:
+        .short  5                       # DWARF version number
+        .byte   5                       # DWARF Unit Type
+        .byte   8                       # Address Size (in bytes)
+        .long   .debug_abbrev           # Offset Into Abbrev. Section
+        .quad   0xdeadbeefbaadf00d      # DWO id
+        .byte   1                       # Abbrev [1] 0xc:0x5f DW_TAG_compile_unit
+        .asciz  "Hand-written DWARF"    # DW_AT_producer
+        .byte   2                       # Abbrev [2] 0x2b:0x37 DW_TAG_subprogram
+        .byte   0                       # DW_AT_low_pc
+        .long   .Lrnglists_end-rnglists # DW_AT_high_pc
+        .asciz  "rnglists"              # DW_AT_name
+        .byte   5                       # Abbrev [5] 0x52:0xf DW_TAG_lexical_block
+        .byte   0                       # DW_AT_ranges
+        .byte   0                       # End Of Children Mark
+        .byte   0                       # End Of Children Mark
+.Ldebug_info_end1:
+
+        .section        .debug_rnglists.dwo,"e",@progbits
+        .long   .Ldwo_rnglist_table_end-.Ldwo_rnglist_table_start # Length
+.Ldwo_rnglist_table_start:
+        .short  5                       # Version
+        .byte   8                       # Address size
+        .byte   0                       # Segment selector size
+        .long   1                       # Offset entry count
+.Ldwo_rnglists_table_base:
+        .long   .Ldwo_ranges-.Ldwo_rnglists_table_base
+.Ldwo_ranges:
+        .byte   3                       # DW_RLE_startx_length
+        .uleb128 1
+        .uleb128 .Lblock1_end-.Lblock1_begin
+        .byte   0                       # DW_RLE_end_of_list
+.Ldwo_rnglist_table_end: