[ELF] - Added testcase gdb-index-ranges.s

[grimar]

Summary

Before rL301170 was landed, LLD did not produce correct entries in .gdb_index address area.
Issue was fixed on LLVM DWARF parsers size and was relative to how .debug_ranges
section was scanned. It was main problem of PR32319 I think.

At the same time I think it makes sense to have testcase on LLD size too.
This checks that we generate proper values now, because we do not have any tests for .gdb_index
which works with .debug_ranges atm.

[ruiu]

LGTM

lld/trunk/test/ELF/gdb-index-ranges.s

+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
+# RUN: ld.lld --gdb-index -e main %t.o -o %t
+# RUN: llvm-dwarfdump -debug-dump=gdb_index %t | FileCheck %s
+
+# CHECK:       .gnu_index contents:
+# CHECK:        Address area offset = 0x28, has 2 entries:
+# CHECK-NEXT:     Low/High address = [0x201000, 0x201001) (Size: 0x1), CU id = 0
+# CHECK-NEXT:     Low/High address = [0x201001, 0x201003) (Size: 0x2), CU id = 0
+
+.section .text.foo1,"ax",@progbits
+.Lfunc_begin0:
+ nop
+.Lfunc_end0:
+
+.section .text.foo2,"ax",@progbits
+.Lfunc_begin1:
+ nop
+ nop
+.Lfunc_end1:
+
+.section .debug_abbrev,"",@progbits
+.byte 1                       # Abbreviation Code
+.byte 17                      # DW_TAG_compile_unit
+.byte 0                       # DW_CHILDREN_no
+.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 0                       # EOM(3)
+
+.section .debug_info,"",@progbits
+.Lcu_begin0:
+.long 38                      # Length of Unit
+.short 4                      # DWARF version number
+.long .debug_abbrev           # Offset Into Abbrev. Section
+.byte 8                       # Address Size (in bytes)
+.byte 1                       # Abbrev [1] 0xb:0x1f DW_TAG_compile_unit
+.long 0                       # DW_AT_producer
+.short 4                      # DW_AT_language
+.long 0                       # DW_AT_name
+.long 0                       # DW_AT_stmt_list
+.long 0                       # DW_AT_comp_dir
+.quad 0                       # DW_AT_low_pc
+.long .Ldebug_ranges0         # DW_AT_ranges
+
+.section .debug_ranges,"",@progbits
+.Ldebug_ranges0:
+.quad .Lfunc_begin0
+.quad .Lfunc_end0
+.quad .Lfunc_begin1
+.quad .Lfunc_end1
+.quad 0
+.quad 0