[DebugInfoMetadata] Move main subprogram DIFlag into DISPFlags

Moving subprogram specific flags into DISPFlags makes IR code more readable.
In addition, we provide free space in DIFlags for other
'non-subprogram-specific' debug info flags.

Patch by Djordje Todorovic.

Differential Revision: https://reviews.llvm.org/D59288

llvm-svn: 356454

2 files changed, 24 insertions, 0 deletions

diff --git a/llvm/test/Bitcode/DISubprogram-v5.ll b/llvm/test/Bitcode/DISubprogram-v5.ll
new file mode 100644
index 00000000000..58e8600115f
--- /dev/null
+++ b/llvm/test/Bitcode/DISubprogram-v5.ll
@@ -0,0 +1,24 @@
+ ; The .bc file was generated from this source using llvm-as from 8.0 release.
+ ; RUN: llvm-dis < %s.bc | FileCheck %s
+
+define i32 @main() !dbg !5 {
+entry:
+  %retval = alloca i32, align 4
+  store i32 0, i32* %retval
+  ret i32 0, !dbg !9
+}
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
+!1 = !DIFile(filename: "mainsubprogram.c", directory: "/dir")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 1, !"Debug Info Version", i32 3}
+!5 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 6, type: !6, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped | DIFlagMainSubprogram, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+; CHECK: !5 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 6, type: !6, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagMainSubprogram, unit: !0, retainedNodes: !2)
+!6 = !DISubroutineType(types: !7)
+!7 = !{!8}
+!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!9 = !DILocation(line: 7, scope: !5)
diff --git a/llvm/test/Bitcode/DISubprogram-v5.ll.bc b/llvm/test/Bitcode/DISubprogram-v5.ll.bc
new file mode 100755
index 00000000000..f3482e1c1a7
--- /dev/null
+++ b/llvm/test/Bitcode/DISubprogram-v5.ll.bc