DWARF: Skip zero column for inline call sites

D64033 <https://reviews.llvm.org/D64033> added DW_AT_call_column for
inline sites. However, that change wasn't aware of "-gno-column-info".
To avoid adding column info when "-gno-column-info" is used, now
DW_AT_call_column is only added when we have non-zero column (when
"-gno-column-info" is used, column will be zero).

Patch by Wenlei He!

Differential Revision: https://reviews.llvm.org/D64784

llvm-svn: 366264

Author: dwblaikie

llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp

@@ -543,7 +543,8 @@ DIE *DwarfCompileUnit::constructInlinedScopeDIE(LexicalScope *Scope) {
   addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
           getOrCreateSourceID(IA->getFile()));
   addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, IA->getLine());
-  addUInt(*ScopeDIE, dwarf::DW_AT_call_column, None, IA->getColumn());
+  if (IA->getColumn())
+    addUInt(*ScopeDIE, dwarf::DW_AT_call_column, None, IA->getColumn());
   if (IA->getDiscriminator() && DD->getDwarfVersion() >= 4)
     addUInt(*ScopeDIE, dwarf::DW_AT_GNU_discriminator, None,
             IA->getDiscriminator());

llvm/test/DebugInfo/X86/fission-inline.ll

@@ -71,6 +71,8 @@
 ; CHECK:     DW_AT_call_file
 ; CHECK-NEXT:     DW_AT_call_line {{.*}} (18)
 ; CHECK-NEXT:     DW_AT_call_column {{.*}} (0x05)
+; CHECK:     DW_AT_call_file
+; CHECK-NEXT:     DW_AT_call_line {{.*}} (21)
 ; CHECK-NOT: DW_
 ; CHECK: .debug_info.dwo contents:
 
@@ -82,6 +84,7 @@ entry:
   call void @_Z2f1v(), !dbg !26
   call void @_Z2f1v(), !dbg !25
   call void @_Z2f1v(), !dbg !28
+  call void @_Z2f1v(), !dbg !29
   ret void, !dbg !29
 }
 
@@ -122,4 +125,5 @@ attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "n
 !26 = !DILocation(line: 11, column: 3, scope: !11, inlinedAt: !27)
 !27 = !DILocation(line: 18, column: 5, scope: !20)
 !28 = !DILocation(line: 12, column: 3, scope: !11, inlinedAt: !27)
-!29 = !DILocation(line: 21, column: 1, scope: !10)
+!29 = !DILocation(line: 12, column: 3, scope: !11, inlinedAt: !30)
+!30 = !DILocation(line: 21, column: 0, scope: !10)