Revert r198208 and reapply:

      r198196: Use a pointer to keep track of the skeleton unit for each normal unit and construct it up front.
      r198199: Reapply r198196 with a fix to zero initialize the skeleton pointer.
      r198202: Fix aranges and split dwarf by ensuring that the symbol and relocation back to the compile unit from the aranges section is to the skeleton unit and not the one in the dwo.

with a fix to use integer 0 for DW_AT_low_pc since the relocation to the text section symbol was causing issues with COFF. Accordingly remove addLocalLabelAddress and machinery since we're not currently using it.

llvm-svn: 198222

3 files changed, 14 insertions, 6 deletions

diff --git a/llvm/test/DebugInfo/X86/arange.ll b/llvm/test/DebugInfo/X86/arange.ll
index fd0d0a3e08d..819f9863bc7 100644
--- a/llvm/test/DebugInfo/X86/arange.ll
+++ b/llvm/test/DebugInfo/X86/arange.ll
@@ -1,6 +1,7 @@
 ; REQUIRES: object-emission
 
 ; RUN: llc -mtriple=x86_64-linux -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=aranges - | FileCheck %s
+; RUN: llc -mtriple=x86_64-linux -O0 -filetype=obj < %s | llvm-readobj --relocations - | FileCheck --check-prefix=OBJ %s
 
 ; extern int i;
 ; template<int *x>
@@ -15,6 +16,10 @@
 ; CHECK-NEXT: [0x
 ; CHECK-NOT: [0x
 
+; Check that we have a relocation back to the debug_info section from the debug_aranges section
+; OBJ: debug_aranges
+; OBJ-NEXT: R_X86_64_32 .debug_info 0x0
+
 %struct.foo = type { i8 }
 
 @f = global %struct.foo zeroinitializer, align 1
diff --git a/llvm/test/DebugInfo/X86/fission-cu.ll b/llvm/test/DebugInfo/X86/fission-cu.ll
index 06408d70815..d8f7a8e3001 100644
--- a/llvm/test/DebugInfo/X86/fission-cu.ll
+++ b/llvm/test/DebugInfo/X86/fission-cu.ll
@@ -25,19 +25,19 @@
 ; CHECK: [1] DW_TAG_compile_unit DW_CHILDREN_no
 ; CHECK: DW_AT_GNU_dwo_name      DW_FORM_strp
 ; CHECK: DW_AT_GNU_addr_base     DW_FORM_sec_offset
-; CHECK: DW_AT_low_pc    DW_FORM_addr
 ; CHECK: DW_AT_stmt_list DW_FORM_sec_offset
 ; CHECK: DW_AT_comp_dir  DW_FORM_strp
 ; CHECK: DW_AT_GNU_dwo_id        DW_FORM_data8
+; CHECK: DW_AT_low_pc    DW_FORM_addr
 
 ; CHECK: .debug_info contents:
 ; CHECK: DW_TAG_compile_unit
 ; CHECK: DW_AT_GNU_dwo_name [DW_FORM_strp] ( .debug_str[0x00000000] = "baz.dwo")
 ; CHECK: DW_AT_GNU_addr_base [DW_FORM_sec_offset]                   (0x00000000)
-; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 ; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset]   (0x00000000)
 ; CHECK: DW_AT_comp_dir [DW_FORM_strp]     ( .debug_str[0x00000008] = "/usr/local/google/home/echristo/tmp")
 ; CHECK: DW_AT_GNU_dwo_id [DW_FORM_data8]  (0x0000000000000000)
+; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 
 ; CHECK: .debug_str contents:
 ; CHECK: 0x00000000: "baz.dwo"
@@ -111,4 +111,7 @@
 ; OBJ-NEXT: R_X86_64_32 .debug_line
 ; OBJ-NEXT: R_X86_64_32 .debug_str
 ; OBJ-NEXT: }
+; OBJ: .debug_aranges
+; OBJ-NEXT: R_X86_64_32 .debug_info 0x0
+
 !9 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
diff --git a/llvm/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll b/llvm/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
index 147937aaf48..e63cbd11e48 100644
--- a/llvm/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
+++ b/llvm/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
@@ -7,12 +7,12 @@
 ; rdar://13067005
 ; CHECK: .debug_info contents:
 ; CHECK: DW_TAG_compile_unit
-; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 ; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset]   (0x00000000)
+; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 
 ; CHECK: DW_TAG_compile_unit
-; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 ; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset]   (0x0000003c)
+; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 
 ; CHECK: .debug_line contents:
 ; CHECK-NEXT: Line table prologue:
@@ -25,12 +25,12 @@
 
 ; DWARF3: .debug_info contents:
 ; DWARF3: DW_TAG_compile_unit
-; DWARF3: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 ; DWARF3: DW_AT_stmt_list [DW_FORM_data4]   (0x00000000)
+; DWARF3: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 
 ; DWARF3: DW_TAG_compile_unit
-; DWARF3: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 ; DWARF3: DW_AT_stmt_list [DW_FORM_data4]   (0x0000003c)
+; DWARF3: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
 
 ; DWARF3: .debug_line contents:
 ; DWARF3-NEXT: Line table prologue: