Recommit "[DWARF5]Addition of alignment atrribute in typedef DIE."

This revision is revised to update Go-bindings and Release Notes.

The original commit message follows.

This patch, adds support for DW_AT_alignment[DWARF5] attribute, to be emitted with typdef DIE.
When explicit alignment is specified.

Patch by Awanish Pandey <Awanish.Pandey@amd.com>

Reviewers: aprantl, dblaikie, jini.susan.george, SouraVX, alok,
deadalinx

Differential Revision: https://reviews.llvm.org/D70111

1 files changed, 63 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/X86/debug-info-template-align.ll b/llvm/test/DebugInfo/X86/debug-info-template-align.ll
new file mode 100644
index 00000000000..160d88cd0cc
--- /dev/null
+++ b/llvm/test/DebugInfo/X86/debug-info-template-align.ll
@@ -0,0 +1,63 @@
+; RUN: llc %s -filetype=obj -o - | llvm-dwarfdump -v - | FileCheck %s
+
+; C++ source to regenerate:
+
+;typedef char  __attribute__((__aligned__(64))) alchar;
+
+;int main(){
+;    alchar newChar;
+;}
+; $ clang++ -O0 -g -gdwarf-5 debug-info-template-align.cpp -c
+
+; CHECK: .debug_abbrev contents:
+
+; CHECK: [5] DW_TAG_typedef  DW_CHILDREN_no
+; CHECK:  DW_AT_alignment DW_FORM_udata
+
+; CHECK: .debug_info contents:
+
+;CHECK: DW_TAG_typedef [5]
+;CHECK: DW_AT_name {{.*}} "alchar"
+;CHECK-NEXT: DW_AT_alignment [DW_FORM_udata] (64)
+
+
+; ModuleID = '/dir/test.cpp'
+source_filename = "/dir/test.cpp"
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Function Attrs: noinline norecurse nounwind optnone uwtable
+define dso_local i32 @main() #0 !dbg !7 {
+entry:
+  %newChar = alloca i8, align 64
+  call void @llvm.dbg.declare(metadata i8* %newChar, metadata !12, metadata !DIExpression()), !dbg !15
+  ret i32 0, !dbg !16
+}
+
+; Function Attrs: nounwind readnone speculatable willreturn
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { noinline norecurse nounwind optnone uwtable }
+attributes #1 = { nounwind readnone speculatable willreturn }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 10.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "/dir/test.cpp", directory: "/dir/", checksumkind: CSK_MD5, checksum: "872e252efdfcb9480b4bfaf8437f58ab")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 5}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 10.0.0 "}
+!7 = distinct !DISubprogram(name: "main", scope: !8, file: !8, line: 12, type: !9, scopeLine: 12, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!8 = !DIFile(filename: "test.cpp", directory: "/dir", checksumkind: CSK_MD5, checksum: "872e252efdfcb9480b4bfaf8437f58ab")
+!9 = !DISubroutineType(types: !10)
+!10 = !{!11}
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !DILocalVariable(name: "newChar", scope: !7, file: !8, line: 13, type: !13)
+!13 = !DIDerivedType(tag: DW_TAG_typedef, name: "alchar", file: !8, line: 10, baseType: !14, align: 512)
+!14 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!15 = !DILocation(line: 13, column: 10, scope: !7)
+!16 = !DILocation(line: 14, column: 1, scope: !7)