Turn on CU ranges if we've got multiple compile units in the same

module since there's no range guarantee that we could make given
output order. This also fixes up the testcases that have multiple
CUs to have the correct range offset.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200422 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 66be6058fd2edf3024c223b76d2cd23f6aa34df6..d557f403480296bd53cd01929bb522802ec25152 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1119,10 +1119,12 @@ void DwarfDebug::endSections() {
   }
 
   // For now only turn on CU ranges if we've explicitly asked for it,
-  // we have -ffunction-sections enabled, or we've emitted a function
-  // into a unique section. At this point all sections should be finalized
-  // except for dwarf sections.
-  HasCURanges = DwarfCURanges || UsedNonDefaultText ||
+  // we have -ffunction-sections enabled, we've emitted a function
+  // into a unique section, or we're using LTO. If we're using LTO then
+  // we can't know that any particular function in the module is correlated
+  // to a particular CU and so we need to be conservative. At this point all
+  // sections should be finalized except for dwarf sections.
+  HasCURanges = DwarfCURanges || UsedNonDefaultText || (CUMap.size() > 1) ||
                 TargetMachine::getFunctionSections();
 }
 

diff --git a/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll b/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
index e63cbd11e48faddaaa14384404f7a5b7db37b10d..5cb8f613a340188de3270af66cea26bb69e8f20a 100644 (file)
--- a/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
+++ b/test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
@@ -8,11 +8,11 @@
 ; CHECK: .debug_info contents:
 ; CHECK: DW_TAG_compile_unit
 ; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset]   (0x00000000)
-; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
+; CHECK: DW_AT_ranges [DW_FORM_sec_offset]      (0x00000000)
 
 ; CHECK: DW_TAG_compile_unit
 ; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset]   (0x0000003c)
-; CHECK: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
+; CHECK: DW_AT_ranges [DW_FORM_sec_offset]      (0x00000020)
 
 ; 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_stmt_list [DW_FORM_data4]   (0x00000000)
-; DWARF3: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
+; DWARF3: DW_AT_stmt_list [DW_FORM_data4]    (0x00000000)
+; DWARF3: DW_AT_ranges [DW_FORM_data4]       (0x00000000)
 
 ; DWARF3: DW_TAG_compile_unit
 ; DWARF3: DW_AT_stmt_list [DW_FORM_data4]   (0x0000003c)
-; DWARF3: DW_AT_low_pc [DW_FORM_addr]       (0x0000000000000000)
+; DWARF3: DW_AT_ranges [DW_FORM_data4]      (0x00000020)
 
 ; DWARF3: .debug_line contents:
 ; DWARF3-NEXT: Line table prologue: