DI: Fold constant arguments into a single MDString

This patch addresses the first stage of PR17891 by folding constant
arguments together into a single MDString.  Integers are stringified and
a `\0` character is used as a separator.

Part of PR17891.

Note: I've attached my testcases upgrade scripts to the PR.  If I've
just broken your out-of-tree testcases, they might help.

llvm-svn: 218914

1 files changed, 12 insertions, 12 deletions

diff --git a/llvm/test/DebugInfo/X86/debug-dead-local-var.ll b/llvm/test/DebugInfo/X86/debug-dead-local-var.ll
index 64f0b2a9e40..08a22a64d10 100644
--- a/llvm/test/DebugInfo/X86/debug-dead-local-var.ll
+++ b/llvm/test/DebugInfo/X86/debug-dead-local-var.ll
@@ -27,25 +27,25 @@ attributes #0 = { nounwind readnone uwtable "less-precise-fpmad"="false" "no-fra
 !llvm.module.flags = !{!18, !19}
 !llvm.ident = !{!20}
 
-!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5.0 (trunk 209255) (llvm/trunk 209253)", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/usr/local/google/home/echristo/debug-dead-local-var.c] [DW_LANG_C99]
+!0 = metadata !{metadata !"0x11\0012\00clang version 3.5.0 (trunk 209255) (llvm/trunk 209253)\001\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [/usr/local/google/home/echristo/debug-dead-local-var.c] [DW_LANG_C99]
 !1 = metadata !{metadata !"debug-dead-local-var.c", metadata !"/usr/local/google/home/echristo"}
 !2 = metadata !{}
 !3 = metadata !{metadata !4, metadata !9}
-!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"bar", metadata !"bar", metadata !"", i32 11, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 true, i32 ()* @bar, null, null, metadata !2, i32 11} ; [ DW_TAG_subprogram ] [line 11] [def] [bar]
-!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/usr/local/google/home/echristo/debug-dead-local-var.c]
-!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!4 = metadata !{metadata !"0x2e\00bar\00bar\00\0011\000\001\000\006\000\001\0011", metadata !1, metadata !5, metadata !6, null, i32 ()* @bar, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 11] [def] [bar]
+!5 = metadata !{metadata !"0x29", metadata !1}          ; [ DW_TAG_file_type ] [/usr/local/google/home/echristo/debug-dead-local-var.c]
+!6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
 !7 = metadata !{metadata !8}
-!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
-!9 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"", i32 6, metadata !10, i1 true, i1 true, i32 0, i32 0, null, i32 0, i1 true, null, null, null, metadata !12, i32 6} ; [ DW_TAG_subprogram ] [line 6] [local] [def] [foo]
-!10 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !11, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!8 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!9 = metadata !{metadata !"0x2e\00foo\00foo\00\006\001\001\000\006\000\001\006", metadata !1, metadata !5, metadata !10, null, null, null, null, metadata !12} ; [ DW_TAG_subprogram ] [line 6] [local] [def] [foo]
+!10 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !11, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
 !11 = metadata !{null}
 !12 = metadata !{metadata !13}
-!13 = metadata !{i32 786688, metadata !9, metadata !"xyz", metadata !5, i32 8, metadata !14, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [xyz] [line 8]
-!14 = metadata !{i32 786451, metadata !1, metadata !9, metadata !"X", i32 8, i64 64, i64 32, i32 0, i32 0, null, metadata !15, i32 0, null, null, null} ; [ DW_TAG_structure_type ] [X] [line 8, size 64, align 32, offset 0] [def] [from ]
+!13 = metadata !{metadata !"0x100\00xyz\008\000", metadata !9, metadata !5, metadata !14} ; [ DW_TAG_auto_variable ] [xyz] [line 8]
+!14 = metadata !{metadata !"0x13\00X\008\0064\0032\000\000\000", metadata !1, metadata !9, null, metadata !15, null, null, null} ; [ DW_TAG_structure_type ] [X] [line 8, size 64, align 32, offset 0] [def] [from ]
 !15 = metadata !{metadata !16, metadata !17}
-!16 = metadata !{i32 786445, metadata !1, metadata !14, metadata !"a", i32 8, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [a] [line 8, size 32, align 32, offset 0] [from int]
-!17 = metadata !{i32 786445, metadata !1, metadata !14, metadata !"b", i32 8, i64 32, i64 32, i64 32, i32 0, metadata !8} ; [ DW_TAG_member ] [b] [line 8, size 32, align 32, offset 32] [from int]
+!16 = metadata !{metadata !"0xd\00a\008\0032\0032\000\000", metadata !1, metadata !14, metadata !8} ; [ DW_TAG_member ] [a] [line 8, size 32, align 32, offset 0] [from int]
+!17 = metadata !{metadata !"0xd\00b\008\0032\0032\0032\000", metadata !1, metadata !14, metadata !8} ; [ DW_TAG_member ] [b] [line 8, size 32, align 32, offset 32] [from int]
 !18 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
-!19 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
+!19 = metadata !{i32 2, metadata !"Debug Info Version", i32 2}
 !20 = metadata !{metadata !"clang version 3.5.0 (trunk 209255) (llvm/trunk 209253)"}
 !21 = metadata !{i32 13, i32 0, metadata !4, null}