[PATCH] D37297: [ELF] - Add testcase testing .gdb_index generation when base address of CU is used.

[George Rimar via Phabricator via llvm-commits]

grimar created this revision.
Herald added a subscriber: emaste.

Currently lib/DebugInfo incorrectly handles the case when debug ranges
uses base address of CU. Section index is not calulcated properly and
LLD crashes on provided testcase.

https://reviews.llvm.org/D36097 and https://reviews.llvm.org/D37214 were posted to address the issue.
I tested this testcase with https://reviews.llvm.org/D37214.

Posting it for review, so we will be able to commit it when issue be fixed.


https://reviews.llvm.org/D37297

Files:
  test/ELF/gdb-index-base-addr.s


Index: test/ELF/gdb-index-base-addr.s
===================================================================
--- test/ELF/gdb-index-base-addr.s
+++ test/ELF/gdb-index-base-addr.s
@@ -0,0 +1,70 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t1.o
+# RUN: ld.lld --gdb-index %t1.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 = [0x201003, 0x201006) (Size: 0x3), CU id = 0
+
+.text
+.globl foo
+.type foo, at function
+foo: 
+.Lfunc_begin0:
+  nop
+.Ltmp0:
+  nop
+  nop
+.Ltmp1:
+  nop
+  nop
+  nop
+.Ltmp2:
+
+.section .debug_abbrev,"", at 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,"", at 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 .Lfunc_begin0           # DW_AT_low_pc
+.long .Ldebug_ranges0         # DW_AT_ranges
+
+.section .debug_ranges,"", at progbits
+.Ldebug_ranges0:
+ .quad .Lfunc_begin0-.Lfunc_begin0
+ .quad .Ltmp0-.Lfunc_begin0
+ .quad .Ltmp1-.Lfunc_begin0
+ .quad .Ltmp2-.Lfunc_begin0
+ .quad 0
+ .quad 0


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