DebugInfo: preparation to implement DW_AT_alignment

 - Add alignment attribute to DIVariable family
 - Modify bitcode format to match new DIVariable representation
 - Update tests to match these changes (also add bitcode upgrade test)
 - Expect that frontend passes non-zero align value only when it is not default
   (was forcibly aligned by alignas()/_Alignas()/__atribute__(aligned())

Differential Revision: https://reviews.llvm.org/D25073


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284678 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 43 insertions, 0 deletions

diff --git a/test/Bitcode/dilocalvariable-3.9.ll b/test/Bitcode/dilocalvariable-3.9.ll
new file mode 100644
index 00000000000..6ce4ab3fa39
--- /dev/null
+++ b/test/Bitcode/dilocalvariable-3.9.ll
@@ -0,0 +1,43 @@
+; RUN: llvm-dis -o - %s.bc | FileCheck %s
+
+; CHECK: !9 = !DILocalVariable(name: "i", scope: !6, file: !1, line: 3, type: !10)
+; CHECK: !10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+
+source_filename = "test.cpp"
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Function Attrs: nounwind uwtable
+define void @_Z1fv() #0 !dbg !6 {
+entry:
+  %i = alloca i32, align 4
+  call void @llvm.dbg.declare(metadata i32* %i, metadata !10, metadata !12), !dbg !13
+  store i32 42, i32* %i, align 4, !dbg !13
+  ret void, !dbg !14
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+!llvm.ident = !{!5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.1 (http://llvm.org/git/clang.git c3709e72d22432f53f8e2f14354def31a96734fe)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "test.cpp", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{!"clang version 3.9.1 (http://llvm.org/git/clang.git c3709e72d22432f53f8e2f14354def31a96734fe)"}
+!6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !7, file: !7, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!7 = !DIFile(filename: "test.cpp", directory: "/tmp")
+!8 = !DISubroutineType(types: !9)
+!9 = !{null}
+!10 = !DILocalVariable(name: "i", scope: !6, file: !7, line: 3, type: !11)
+!11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!12 = !DIExpression()
+!13 = !DILocation(line: 3, column: 7, scope: !6)
+!14 = !DILocation(line: 4, column: 1, scope: !6)
diff --git a/test/Bitcode/dilocalvariable-3.9.ll.bc b/test/Bitcode/dilocalvariable-3.9.ll.bc
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/test/Bitcode/dilocalvariable-3.9.ll.bc