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, 11 insertions, 11 deletions

diff --git a/llvm/test/DebugInfo/array.ll b/llvm/test/DebugInfo/array.ll
index 9a59524dece..2c7195ba48a 100644
--- a/llvm/test/DebugInfo/array.ll
+++ b/llvm/test/DebugInfo/array.ll
@@ -6,7 +6,7 @@ entry:
   %retval = alloca i32, align 4
   %a = alloca [0 x i32], align 4
   store i32 0, i32* %retval
-  call void @llvm.dbg.declare(metadata !{[0 x i32]* %a}, metadata !6, metadata !{i32 786690}), !dbg !11
+  call void @llvm.dbg.declare(metadata !{[0 x i32]* %a}, metadata !6, metadata !{metadata !"0x102"}), !dbg !11
   ret i32 0, !dbg !12
 }
 
@@ -15,25 +15,25 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !llvm.dbg.cu = !{!2}
 !llvm.module.flags = !{!16}
 
-!0 = metadata !{i32 786478, metadata !14, metadata !1, metadata !"main", metadata !"main", metadata !"", i32 3, metadata !3, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 false, i32 ()* @main, null, null, null, i32 3} ; [ DW_TAG_subprogram ] [line 3] [def] [main]
-!1 = metadata !{i32 786473, metadata !14} ; [ DW_TAG_file_type ]
-!2 = metadata !{i32 786449, metadata !14, i32 12, metadata !"clang version 3.0 (trunk 129138)", i1 false, metadata !"", i32 0, metadata !15, metadata !15, metadata !13, null,  null, null} ; [ DW_TAG_compile_unit ]
-!3 = metadata !{i32 786453, metadata !14, metadata !1, metadata !"", i32 0, i64 0, i64 0, i32 0, i32 0, null, metadata !4, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!0 = metadata !{metadata !"0x2e\00main\00main\00\003\000\001\000\006\000\000\003", metadata !14, metadata !1, metadata !3, null, i32 ()* @main, null, null, null} ; [ DW_TAG_subprogram ] [line 3] [def] [main]
+!1 = metadata !{metadata !"0x29", metadata !14} ; [ DW_TAG_file_type ]
+!2 = metadata !{metadata !"0x11\0012\00clang version 3.0 (trunk 129138)\000\00\000\00\000", metadata !14, metadata !15, metadata !15, metadata !13, null,  null} ; [ DW_TAG_compile_unit ]
+!3 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !14, metadata !1, null, metadata !4, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
 !4 = metadata !{metadata !5}
-!5 = metadata !{i32 786468, null, metadata !2, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
-!6 = metadata !{i32 786688, metadata !7, metadata !"a", metadata !1, i32 4, metadata !8, i32 0, null} ; [ DW_TAG_auto_variable ]
-!7 = metadata !{i32 786443, metadata !14, metadata !0, i32 3, i32 12, i32 0} ; [ DW_TAG_lexical_block ]
-!8 = metadata !{i32 786433, metadata !14, metadata !2, metadata !"", i32 0, i64 0, i64 32, i32 0, i32 0, metadata !5, metadata !9, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
+!5 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, metadata !2} ; [ DW_TAG_base_type ]
+!6 = metadata !{metadata !"0x100\00a\004\000", metadata !7, metadata !1, metadata !8} ; [ DW_TAG_auto_variable ]
+!7 = metadata !{metadata !"0xb\003\0012\000", metadata !14, metadata !0} ; [ DW_TAG_lexical_block ]
+!8 = metadata !{metadata !"0x1\00\000\000\0032\000\000", metadata !14, metadata !2, metadata !5, metadata !9, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
 !9 = metadata !{metadata !10}
 ;CHECK: DW_TAG_subrange_type
 ;CHECK-NEXT: DW_AT_type
 ;CHECK-NOT: DW_AT_lower_bound
 ;CHECK-NOT: DW_AT_upper_bound
 ;CHECK-NEXT: End Of Children Mark
-!10 = metadata !{i32 786465, i64 0, i64 -1}        ; [ DW_TAG_subrange_type ]
+!10 = metadata !{metadata !"0x21\000\00-1"}        ; [ DW_TAG_subrange_type ]
 !11 = metadata !{i32 4, i32 7, metadata !7, null}
 !12 = metadata !{i32 5, i32 3, metadata !7, null}
 !13 = metadata !{metadata !0}
 !14 = metadata !{metadata !"array.c", metadata !"/private/tmp"}
 !15 = metadata !{i32 0}
-!16 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!16 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}