Add a 'count' field to the DWARF subrange.

The count field is necessary because there isn't a difference between the 'lo'
and 'hi' attributes for a one-element array and a zero-element array. When the
count is '0', we know that this is a zero-element array. When it's >=1, then
it's a normal constant sized array. When it's -1, then the array is unbounded.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169218 91177308-0d34-0410-b5e6-96231b3b80d8

19 files changed, 158 insertions, 18 deletions

diff --git a/include/llvm/DIBuilder.h b/include/llvm/DIBuilder.h
index 79dcad8dbc..72566322e1 100644
--- a/include/llvm/DIBuilder.h
+++ b/include/llvm/DIBuilder.h
@@ -371,7 +371,7 @@ namespace llvm {
 
     /// getOrCreateSubrange - Create a descriptor for a value range.  This
     /// implicitly uniques the values returned.
-    DISubrange getOrCreateSubrange(int64_t Lo, int64_t Hi);
+    DISubrange getOrCreateSubrange(int64_t Lo, int64_t Hi, int64_t Count);
 
     /// createGlobalVariable - Create a new descriptor for the specified global.
     /// @param Name        Name of the variable.
diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 718e0dceb0..f5f36e461f 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -1252,6 +1252,7 @@ void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
   addDIEEntry(DW_Subrange, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IndexTy);
   uint64_t L = SR.getLo();
   uint64_t H = SR.getHi();
+  int64_t Count = SR.getCount();
 
   // The L value defines the lower bounds which is typically zero for C/C++. The
   // H value is the upper bounds.  Values are 64 bit.  H - L + 1 is the size
@@ -1265,7 +1266,8 @@ void CompileUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR,
   }
   if (L)
     addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L);
-  addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);
+  if (H > 0 || Count != 0)
+    addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);
   Buffer.addChild(DW_Subrange);
 }
 
diff --git a/lib/VMCore/DIBuilder.cpp b/lib/VMCore/DIBuilder.cpp
index 74b69e4617..2b77edc7f9 100644
--- a/lib/VMCore/DIBuilder.cpp
+++ b/lib/VMCore/DIBuilder.cpp
@@ -741,11 +741,13 @@ DIArray DIBuilder::getOrCreateArray(ArrayRef<Value *> Elements) {
 
 /// getOrCreateSubrange - Create a descriptor for a value range.  This
 /// implicitly uniques the values returned.
-DISubrange DIBuilder::getOrCreateSubrange(int64_t Lo, int64_t Hi) {
+DISubrange DIBuilder::getOrCreateSubrange(int64_t Lo, int64_t Hi,
+                                          int64_t Count) {
   Value *Elts[] = {
     GetTagConstant(VMContext, dwarf::DW_TAG_subrange_type),
     ConstantInt::get(Type::getInt64Ty(VMContext), Lo),
-    ConstantInt::get(Type::getInt64Ty(VMContext), Hi)
+    ConstantInt::get(Type::getInt64Ty(VMContext), Hi),
+    ConstantInt::get(Type::getInt64Ty(VMContext), Count)
   };
 
   return DISubrange(MDNode::get(VMContext, Elts));
diff --git a/test/CodeGen/ARM/debug-info-branch-folding.ll b/test/CodeGen/ARM/debug-info-branch-folding.ll
index 4f4ff8e817..52076ada85 100644
--- a/test/CodeGen/ARM/debug-info-branch-folding.ll
+++ b/test/CodeGen/ARM/debug-info-branch-folding.ll
@@ -52,7 +52,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
 !6 = metadata !{i32 590083, metadata !2, metadata !"", metadata !2, i32 0, i64 128, i64 128, i32 0, i32 0, metadata !7, metadata !8, i32 0, i32 0} ; [ DW_TAG_vector_type ]
 !7 = metadata !{i32 589860, metadata !2, metadata !"float", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 4} ; [ DW_TAG_base_type ]
 !8 = metadata !{metadata !9}
-!9 = metadata !{i32 589857, i64 0, i64 3}         ; [ DW_TAG_subrange_type ]
+!9 = metadata !{i32 589857, i64 0, i64 3, i64 4}         ; [ DW_TAG_subrange_type ]
 !10 = metadata !{i32 589870, i32 0, metadata !1, metadata !"main", metadata !"main", metadata !"", metadata !1, i32 59, metadata !11, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 true, i32 (i32, i8**, i1)* @main, null} ; [ DW_TAG_subprogram ]
 !11 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !12, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
 !12 = metadata !{metadata !13}
diff --git a/test/CodeGen/ARM/debug-info-qreg.ll b/test/CodeGen/ARM/debug-info-qreg.ll
index 97c9c66c58..7e925c1d02 100644
--- a/test/CodeGen/ARM/debug-info-qreg.ll
+++ b/test/CodeGen/ARM/debug-info-qreg.ll
@@ -49,7 +49,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
 !6 = metadata !{i32 590083, metadata !2, metadata !"", metadata !2, i32 0, i64 128, i64 128, i32 0, i32 0, metadata !7, metadata !8, i32 0, i32 0} ; [ DW_TAG_vector_type ]
 !7 = metadata !{i32 589860, metadata !2, metadata !"float", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 4} ; [ DW_TAG_base_type ]
 !8 = metadata !{metadata !9}
-!9 = metadata !{i32 589857, i64 0, i64 3}         ; [ DW_TAG_subrange_type ]
+!9 = metadata !{i32 589857, i64 0, i64 3, i64 4}         ; [ DW_TAG_subrange_type ]
 !10 = metadata !{i32 589870, i32 0, metadata !1, metadata !"main", metadata !"main", metadata !"", metadata !1, i32 59, metadata !11, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 true, i32 (i32, i8**)* @main, null} ; [ DW_TAG_subprogram ]
 !11 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !12, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
 !12 = metadata !{metadata !13}
diff --git a/test/CodeGen/Thumb/2010-07-15-debugOrdering.ll b/test/CodeGen/Thumb/2010-07-15-debugOrdering.ll
index 9f5a677ed3..84a5cfa94e 100644
--- a/test/CodeGen/Thumb/2010-07-15-debugOrdering.ll
+++ b/test/CodeGen/Thumb/2010-07-15-debugOrdering.ll
@@ -61,7 +61,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
 !12 = metadata !{i32 524289, metadata !4, metadata !"", metadata !4, i32 0, i64 192, i64 32, i64 0, i32 0, metadata !13, metadata !14, i32 0, null} ; [ DW_TAG_array_type ]
 !13 = metadata !{i32 524324, metadata !4, metadata !"double", metadata !4, i32 0, i64 64, i64 32, i64 0, i32 0, i32 4} ; [ DW_TAG_base_type ]
 !14 = metadata !{metadata !15}
-!15 = metadata !{i32 524321, i64 0, i64 2}        ; [ DW_TAG_subrange_type ]
+!15 = metadata !{i32 524321, i64 0, i64 2, i64 3}        ; [ DW_TAG_subrange_type ]
 !16 = metadata !{i32 524334, i32 0, metadata !8, metadata !"ggVector3", metadata !"ggVector3", metadata !"", metadata !9, i32 72, metadata !17, i1 false, i1 false, i32 0, i32 0, null, i1 false, i1 false, null} ; [ DW_TAG_subprogram ]
 !17 = metadata !{i32 524309, metadata !4, metadata !"", metadata !4, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !18, i32 0, null} ; [ DW_TAG_subroutine_type ]
 !18 = metadata !{null, metadata !19, metadata !20}
diff --git a/test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll b/test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll
index 0dca14d064..57c9ea78fa 100644
--- a/test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll
+++ b/test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll
@@ -78,7 +78,7 @@ declare void @llvm.stackrestore(i8*) nounwind
 !9 = metadata !{i32 458767, metadata !2, metadata !"", metadata !2, i32 0, i64 64, i64 64, i64 0, i32 64, metadata !10} ; [ DW_TAG_pointer_type ]
 !10 = metadata !{i32 458753, metadata !2, metadata !"", metadata !2, i32 0, i64 8, i64 8, i64 0, i32 0, metadata !5, metadata !11, i32 0, null} ; [ DW_TAG_array_type ]
 !11 = metadata !{metadata !12}
-!12 = metadata !{i32 458785, i64 0, i64 0}        ; [ DW_TAG_subrange_type ]
+!12 = metadata !{i32 458785, i64 0, i64 0, i64 1}        ; [ DW_TAG_subrange_type ]
 !13 = metadata !{i32 3, i32 0, metadata !14, null}
 !14 = metadata !{i32 458763, metadata !1, i32 0, i32 0} ; [ DW_TAG_lexical_block ]
 !15 = metadata !{i32 4, i32 0, metadata !14, null}
diff --git a/test/CodeGen/X86/2010-07-06-DbgCrash.ll b/test/CodeGen/X86/2010-07-06-DbgCrash.ll
index edd6015b0d..7b18cc7a7c 100644
--- a/test/CodeGen/X86/2010-07-06-DbgCrash.ll
+++ b/test/CodeGen/X86/2010-07-06-DbgCrash.ll
@@ -16,7 +16,7 @@
 !103 = metadata !{i32 524299, metadata !97, i32 73, i32 0} ; [ DW_TAG_lexical_block ]
 !104 = metadata !{i32 524289, metadata !38, metadata !"", metadata !38, i32 0, i64 85312, i64 64, i64 0, i32 0, metadata !46, metadata !105, i32 0, null} ; [ DW_TAG_array_type ]
 !105 = metadata !{metadata !106}
-!106 = metadata !{i32 524321, i64 0, i64 1332}    ; [ DW_TAG_subrange_type ]
+!106 = metadata !{i32 524321, i64 0, i64 1332, i64 1333}    ; [ DW_TAG_subrange_type ]
 !107 = metadata !{i32 73, i32 0, metadata !103, null}
 
 define i32 @main() nounwind ssp {
diff --git a/test/CodeGen/X86/dbg-at-specficiation.ll b/test/CodeGen/X86/dbg-at-specficiation.ll
index aa5e6efede..cbd1e82c45 100644
--- a/test/CodeGen/X86/dbg-at-specficiation.ll
+++ b/test/CodeGen/X86/dbg-at-specficiation.ll
@@ -17,4 +17,4 @@
 !7 = metadata !{i32 720897, null, metadata !"", null, i32 0, i64 320, i64 32, i32 0, i32 0, metadata !8, metadata !9, i32 0, i32 0} ; [ DW_TAG_array_type ]
 !8 = metadata !{i32 720932, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
 !9 = metadata !{metadata !10}
-!10 = metadata !{i32 720929, i64 0, i64 9}        ; [ DW_TAG_subrange_type ]
+!10 = metadata !{i32 720929, i64 0, i64 9, i64 10}        ; [ DW_TAG_subrange_type ]
diff --git a/test/CodeGen/X86/dbg-declare.ll b/test/CodeGen/X86/dbg-declare.ll
index 5d4cedc5c4..c948f6cfc8 100644
--- a/test/CodeGen/X86/dbg-declare.ll
+++ b/test/CodeGen/X86/dbg-declare.ll
@@ -51,7 +51,7 @@ declare void @llvm.stackrestore(i8*) nounwind
 !19 = metadata !{i32 786433, null, metadata !"", null, i32 0, i64 0, i64 8, i32 0, i32 0, metadata !20, metadata !21, i32 0, i32 0} ; [ DW_TAG_array_type ]
 !20 = metadata !{i32 786468, null, metadata !"char", null, i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ]
 !21 = metadata !{metadata !22}
-!22 = metadata !{i32 786465, i64 1, i64 0}        ; [ DW_TAG_subrange_type ]
+!22 = metadata !{i32 786465, i64 1, i64 0, i64 -1}        ; [ DW_TAG_subrange_type ]
 !23 = metadata !{i32 7, i32 8, metadata !17, null}
 !24 = metadata !{i32 9, i32 1, metadata !17, null}
 !25 = metadata !{i32 8, i32 3, metadata !17, null}
diff --git a/test/CodeGen/X86/dbg-subrange.ll b/test/CodeGen/X86/dbg-subrange.ll
index 788910c7fe..5ef79162d9 100644
--- a/test/CodeGen/X86/dbg-subrange.ll
+++ b/test/CodeGen/X86/dbg-subrange.ll
@@ -31,7 +31,7 @@ entry:
 !14 = metadata !{i32 720897, null, metadata !"", null, i32 0, i64 34359738368, i64 8, i32 0, i32 0, metadata !15, metadata !16, i32 0, i32 0} ; [ DW_TAG_array_type ]
 !15 = metadata !{i32 720932, null, metadata !"char", null, i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ]
 !16 = metadata !{metadata !17}
-!17 = metadata !{i32 720929, i64 0, i64 4294967295} ; [ DW_TAG_subrange_type ]
+!17 = metadata !{i32 720929, i64 0, i64 4294967295, i64 4294967296} ; [ DW_TAG_subrange_type ]
 !18 = metadata !{i32 5, i32 3, metadata !19, null}
 !19 = metadata !{i32 720907, metadata !5, i32 4, i32 1, metadata !6, i32 0} ; [ DW_TAG_lexical_block ]
 !20 = metadata !{i32 6, i32 1, metadata !19, null}
diff --git a/test/DebugInfo/2010-03-30-InvalidDbgInfoCrash.ll b/test/DebugInfo/2010-03-30-InvalidDbgInfoCrash.ll
index 9bb35fab4f..fdb904faab 100644
--- a/test/DebugInfo/2010-03-30-InvalidDbgInfoCrash.ll
+++ b/test/DebugInfo/2010-03-30-InvalidDbgInfoCrash.ll
@@ -25,6 +25,6 @@ declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
 !14 = metadata !{i32 524289, metadata !4, metadata !"", metadata !4, i32 0, i64 8, i64 8, i64 0, i32 0, metadata !15, metadata !16, i32 0, null} ; [ DW_TAG_array_type ]
 !15 = metadata !{i32 524324, metadata !4, metadata !"char", metadata !4, i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ]
 !16 = metadata !{metadata !17}
-!17 = metadata !{i32 524321, i64 0, i64 0}        ; [ DW_TAG_subrange_type ]
+!17 = metadata !{i32 524321, i64 0, i64 0, i64 1}        ; [ DW_TAG_subrange_type ]
 !18 = metadata !{metadata !"llvm.mdnode.fwdref.19"}
 !19 = metadata !{metadata !"llvm.mdnode.fwdref.23"}
diff --git a/test/DebugInfo/2010-05-03-OriginDIE.ll b/test/DebugInfo/2010-05-03-OriginDIE.ll
index 94bddc092f..62f7600d7c 100644
--- a/test/DebugInfo/2010-05-03-OriginDIE.ll
+++ b/test/DebugInfo/2010-05-03-OriginDIE.ll
@@ -81,6 +81,6 @@ declare void @uuid_LtoB(i8*, i8*)
 !30 = metadata !{i32 524310, metadata !3, metadata !"uint32_t", metadata !12, i32 55, i64 0, i64 0, i64 0, i32 0, metadata !31} ; [ DW_TAG_typedef ]
 !31 = metadata !{i32 524324, metadata !3, metadata !"unsigned int", metadata !3, i32 0, i64 32, i64 32, i64 0, i32 0, i32 7} ; [ DW_TAG_base_type ]
 !32 = metadata !{metadata !33}
-!33 = metadata !{i32 524321, i64 0, i64 1}        ; [ DW_TAG_subrange_type ]
+!33 = metadata !{i32 524321, i64 0, i64 1, i64 2}        ; [ DW_TAG_subrange_type ]
 !34 = metadata !{i32 524544, metadata !24, metadata !"addr", metadata !10, i32 96, metadata !35} ; [ DW_TAG_auto_variable ]
 !35 = metadata !{i32 524303, metadata !3, metadata !"", metadata !3, i32 0, i64 32, i64 32, i64 0, i32 0, metadata !11} ; [ DW_TAG_pointer_type ]
diff --git a/test/DebugInfo/X86/empty-and-one-elem-array.ll b/test/DebugInfo/X86/empty-and-one-elem-array.ll
new file mode 100644
index 0000000000..2b7a7eac8e
--- /dev/null
+++ b/test/DebugInfo/X86/empty-and-one-elem-array.ll
@@ -0,0 +1,92 @@
+; RUN: llc -mtriple=x86_64-apple-darwin -O0 -filetype=obj -o %t < %s
+; RUN: llvm-dwarfdump %t | FileCheck %s
+; <rdar://problem/12566646>
+
+%struct.foo = type { i32, [1 x i32] }
+%struct.bar = type { i32, [0 x i32] }
+
+define i32 @func() nounwind uwtable ssp {
+entry:
+  %my_foo = alloca %struct.foo, align 4
+  %my_bar = alloca %struct.bar, align 4
+  call void @llvm.dbg.declare(metadata !{%struct.foo* %my_foo}, metadata !10), !dbg !19
+  call void @llvm.dbg.declare(metadata !{%struct.bar* %my_bar}, metadata !20), !dbg !28
+  %a = getelementptr inbounds %struct.foo* %my_foo, i32 0, i32 0, !dbg !29
+  store i32 3, i32* %a, align 4, !dbg !29
+  %a1 = getelementptr inbounds %struct.bar* %my_bar, i32 0, i32 0, !dbg !30
+  store i32 5, i32* %a1, align 4, !dbg !30
+  %a2 = getelementptr inbounds %struct.foo* %my_foo, i32 0, i32 0, !dbg !31
+  %0 = load i32* %a2, align 4, !dbg !31
+  %a3 = getelementptr inbounds %struct.bar* %my_bar, i32 0, i32 0, !dbg !31
+  %1 = load i32* %a3, align 4, !dbg !31
+  %add = add nsw i32 %0, %1, !dbg !31
+  ret i32 %add, !dbg !31
+}
+
+declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
+
+; An empty array should not have an AT_upper_bound attribute. But an array of 1
+; should.
+
+; CHECK:      0x00000074:   DW_TAG_base_type [5]  
+; CHECK-NEXT: 0x00000075:     DW_AT_name [DW_FORM_strp]  ( .debug_str[0x00000043] = "int")
+; CHECK-NEXT: 0x00000079:     DW_AT_encoding [DW_FORM_data1]   (0x05)
+; CHECK-NEXT: 0x0000007a:     DW_AT_byte_size [DW_FORM_data1]  (0x04)
+
+; int[1]:
+; CHECK:      0x0000007e:   DW_TAG_array_type [7] *
+; CHECK-NEXT: 0x0000007f:     DW_AT_type [DW_FORM_ref4]    (cu + 0x0074 => {0x00000074})
+; CHECK:      0x00000083:     DW_TAG_subrange_type [8]  
+; CHECK-NEXT: 0x00000084:       DW_AT_type [DW_FORM_ref4]  (cu + 0x007b => {0x0000007b})
+; CHECK-NEXT: 0x00000088:       DW_AT_upper_bound [DW_FORM_data1]  (0x00)
+
+; int foo::b[1]:
+; CHECK:      0x000000a1:     DW_TAG_member [10]  
+; CHECK-NEXT: 0x000000a2:       DW_AT_name [DW_FORM_strp]  ( .debug_str[0x00000050] = "b")
+; CHECK-NEXT: 0x000000a6:       DW_AT_type [DW_FORM_ref4]  (cu + 0x007e => {0x0000007e})
+
+; int[0]:
+; CHECK:      0x000000b1:   DW_TAG_array_type [7] *
+; CHECK-NEXT: 0x000000b2:     DW_AT_type [DW_FORM_ref4]    (cu + 0x0074 => {0x00000074})
+; CHECK:      0x000000b6:     DW_TAG_subrange_type [11]  
+; CHECK-NEXT: 0x000000b7:       DW_AT_type [DW_FORM_ref4]  (cu + 0x007b => {0x0000007b})
+
+; int bar::b[0]:
+; CHECK:      0x000000d3:     DW_TAG_member [10]  
+; CHECK-NEXT: 0x000000d4:       DW_AT_name [DW_FORM_strp]  ( .debug_str[0x00000050] = "b")
+; CHECK-NEXT: 0x000000d8:       DW_AT_type [DW_FORM_ref4]  (cu + 0x00b1 => {0x000000b1})
+
+!llvm.dbg.cu = !{!0}
+
+!0 = metadata !{i32 786449, i32 0, i32 12, metadata !"test.c", metadata !"/Volumes/Sandbox/llvm", metadata !"clang version 3.3 (trunk 169136)", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !3, metadata !1} ; [ DW_TAG_compile_unit ] [/Volumes/Sandbox/llvm/test.c] [DW_LANG_C99]
+!1 = metadata !{metadata !2}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4}
+!4 = metadata !{metadata !5}
+!5 = metadata !{i32 786478, i32 0, metadata !6, metadata !"func", metadata !"func", metadata !"", metadata !6, i32 11, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 false, i32 ()* @func, null, null, metadata !1, i32 11} ; [ DW_TAG_subprogram ] [line 11] [def] [func]
+!6 = metadata !{i32 786473, metadata !"test.c", metadata !"/Volumes/Sandbox/llvm", null} ; [ DW_TAG_file_type ]
+!7 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!8 = metadata !{metadata !9}
+!9 = metadata !{i32 786468, null, metadata !"int", null, 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]
+!10 = metadata !{i32 786688, metadata !11, metadata !"my_foo", metadata !6, i32 12, metadata !12, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [my_foo] [line 12]
+!11 = metadata !{i32 786443, metadata !5, i32 11, i32 0, metadata !6, i32 0} ; [ DW_TAG_lexical_block ] [/Volumes/Sandbox/llvm/test.c]
+!12 = metadata !{i32 786451, null, metadata !"foo", metadata !6, i32 1, i64 64, i64 32, i32 0, i32 0, null, metadata !13, i32 0, i32 0, i32 0} ; [ DW_TAG_structure_type ] [foo] [line 1, size 64, align 32, offset 0] [from ]
+!13 = metadata !{metadata !14, metadata !15}
+!14 = metadata !{i32 786445, metadata !12, metadata !"a", metadata !6, i32 2, i64 32, i64 32, i64 0, i32 0, metadata !9} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int]
+!15 = metadata !{i32 786445, metadata !12, metadata !"b", metadata !6, i32 3, i64 32, i64 32, i64 32, i32 0, metadata !16} ; [ DW_TAG_member ] [b] [line 3, size 32, align 32, offset 32] [from ]
+!16 = metadata !{i32 786433, null, metadata !"", null, i32 0, i64 32, i64 32, i32 0, i32 0, metadata !9, metadata !17, i32 0, i32 0} ; [ DW_TAG_array_type ] [line 0, size 32, align 32, offset 0] [from int]
+!17 = metadata !{metadata !18}
+!18 = metadata !{i32 786465, i64 0, i64 0, i64 1} ; [ DW_TAG_subrange_type ] [0, 0]
+!19 = metadata !{i32 12, i32 0, metadata !11, null}
+!20 = metadata !{i32 786688, metadata !11, metadata !"my_bar", metadata !6, i32 13, metadata !21, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [my_bar] [line 13]
+!21 = metadata !{i32 786451, null, metadata !"bar", metadata !6, i32 6, i64 32, i64 32, i32 0, i32 0, null, metadata !22, i32 0, i32 0, i32 0} ; [ DW_TAG_structure_type ] [bar] [line 6, size 32, align 32, offset 0] [from ]
+!22 = metadata !{metadata !23, metadata !24}
+!23 = metadata !{i32 786445, metadata !21, metadata !"a", metadata !6, i32 7, i64 32, i64 32, i64 0, i32 0, metadata !9} ; [ DW_TAG_member ] [a] [line 7, size 32, align 32, offset 0] [from int]
+!24 = metadata !{i32 786445, metadata !21, metadata !"b", metadata !6, i32 8, i64 0, i64 32, i64 32, i32 0, metadata !25} ; [ DW_TAG_member ] [b] [line 8, size 0, align 32, offset 32] [from ]
+!25 = metadata !{i32 786433, null, metadata !"", null, i32 0, i64 0, i64 32, i32 0, i32 0, metadata !9, metadata !26, i32 0, i32 0} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
+!26 = metadata !{metadata !27}
+!27 = metadata !{i32 786465, i64 0, i64 0, i64 0} ; [ DW_TAG_subrange_type ] [0, 0]
+!28 = metadata !{i32 13, i32 0, metadata !11, null}
+!29 = metadata !{i32 15, i32 0, metadata !11, null}
+!30 = metadata !{i32 16, i32 0, metadata !11, null}
+!31 = metadata !{i32 17, i32 0, metadata !11, null}
diff --git a/test/DebugInfo/X86/empty-array.ll b/test/DebugInfo/X86/empty-array.ll
new file mode 100644
index 0000000000..7258af2f3d
--- /dev/null
+++ b/test/DebugInfo/X86/empty-array.ll
@@ -0,0 +1,44 @@
+; RUN: llc -mtriple=x86_64-apple-darwin -O0 -filetype=obj -o %t < %s
+; RUN: llvm-dwarfdump %t | FileCheck %s
+; <rdar://problem/12566646>
+
+%class.A = type { [0 x i32] }
+
+@a = global %class.A zeroinitializer, align 4
+
+; CHECK:      0x0000002d:   DW_TAG_base_type [3]  
+; CHECK-NEXT: 0x0000002e:     DW_AT_byte_size [DW_FORM_data1]  (0x04)
+; CHECK-NEXT: 0x0000002f:     DW_AT_encoding [DW_FORM_data1]   (0x05)
+
+; CHECK:      0x00000030:   DW_TAG_array_type [4] *
+; CHECK-NEXT: 0x00000031:     DW_AT_type [DW_FORM_ref4]    (cu + 0x0026 => {0x00000026})
+
+; CHECK:      0x00000035:     DW_TAG_subrange_type [5]  
+; CHECK-NEXT: 0x00000036:       DW_AT_type [DW_FORM_ref4]  (cu + 0x002d => {0x0000002d})
+
+; CHECK:      0x00000048:     DW_TAG_member [8]  
+; CHECK-NEXT: 0x00000049:       DW_AT_name [DW_FORM_strp]  ( .debug_str[0x0000003f] = "x")
+; CHECK-NEXT: 0x0000004d:       DW_AT_type [DW_FORM_ref4]  (cu + 0x0030 => {0x00000030})
+
+!llvm.dbg.cu = !{!0}
+
+!0 = metadata !{i32 786449, i32 0, i32 4, metadata !"t.cpp", metadata !"/Volumes/Sandbox/llvm", metadata !"clang version 3.3 (trunk 169136)", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !1, metadata !3} ; [ DW_TAG_compile_unit ] [/Volumes/Sandbox/llvm/t.cpp] [DW_LANG_C_plus_plus]
+!1 = metadata !{metadata !2}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4}
+!4 = metadata !{metadata !5}
+!5 = metadata !{i32 786484, i32 0, null, metadata !"a", metadata !"a", metadata !"", metadata !6, i32 1, metadata !7, i32 0, i32 1, %class.A* @a} ; [ DW_TAG_variable ] [a] [line 1] [def]
+!6 = metadata !{i32 786473, metadata !"t.cpp", metadata !"/Volumes/Sandbox/llvm", null} ; [ DW_TAG_file_type ]
+!7 = metadata !{i32 786434, null, metadata !"A", metadata !6, i32 1, i64 0, i64 32, i32 0, i32 0, null, metadata !8, i32 0, null, null} ; [ DW_TAG_class_type ] [A] [line 1, size 0, align 32, offset 0] [from ]
+!8 = metadata !{metadata !9, metadata !14}
+!9 = metadata !{i32 786445, metadata !7, metadata !"x", metadata !6, i32 1, i64 0, i64 0, i64 0, i32 1, metadata !10} ; [ DW_TAG_member ] [x] [line 1, size 0, align 0, offset 0] [private] [from ]
+!10 = metadata !{i32 786433, null, metadata !"", null, i32 0, i64 0, i64 32, i32 0, i32 0, metadata !11, metadata !12, i32 0, i32 0} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
+!11 = metadata !{i32 786468, null, metadata !"int", null, 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]
+!12 = metadata !{metadata !13}
+!13 = metadata !{i32 786465, i64 1, i64 0, i64 -1} ; [ DW_TAG_subrange_type ] [1, 0]
+!14 = metadata !{i32 786478, i32 0, metadata !7, metadata !"A", metadata !"A", metadata !"", metadata !6, i32 1, metadata !15, i1 false, i1 false, i32 0, i32 0, null, i32 320, i1 false, null, null, i32 0, metadata !18, i32 1} ; [ DW_TAG_subprogram ] [line 1] [A]
+!15 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !16, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!16 = metadata !{null, metadata !17}
+!17 = metadata !{i32 786447, i32 0, metadata !"", i32 0, i32 0, i64 64, i64 64, i64 0, i32 1088, metadata !7} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from A]
+!18 = metadata !{metadata !19}
+!19 = metadata !{i32 786468}                      ; [ DW_TAG_base_type ] [line 0, size 0, align 0, offset 0]
diff --git a/test/DebugInfo/array.ll b/test/DebugInfo/array.ll
index 9f592a12a9..fef8fbe4cf 100644
--- a/test/DebugInfo/array.ll
+++ b/test/DebugInfo/array.ll
@@ -29,6 +29,6 @@ declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
 ;CHECK-NOT: DW_AT_lower_bound
 ;CHECK-NOT: DW_AT_upper_bound
 ;CHECK-NEXT: End Of Children Mark
-!10 = metadata !{i32 589857, i64 1, i64 0}        ; [ DW_TAG_subrange_type ]
+!10 = metadata !{i32 589857, i64 1, i64 0, i64 -1}        ; [ DW_TAG_subrange_type ]
 !11 = metadata !{i32 4, i32 7, metadata !7, null}
 !12 = metadata !{i32 5, i32 3, metadata !7, null}
diff --git a/test/JitListener/test-common-symbols.ll b/test/JitListener/test-common-symbols.ll
index 5f460ff686..b664043587 100644
--- a/test/JitListener/test-common-symbols.ll
+++ b/test/JitListener/test-common-symbols.ll
@@ -97,7 +97,7 @@ declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
 !17 = metadata !{i32 720948, i32 0, null, metadata !"zero_arr", metadata !"zero_arr", metadata !"", metadata !6, i32 3, metadata !18, i32 0, i32 1, [10 x i32]* @zero_arr} ; [ DW_TAG_variable ]
 !18 = metadata !{i32 720897, null, metadata !"", null, i32 0, i64 320, i64 32, i32 0, i32 0, metadata !9, metadata !19, i32 0, i32 0} ; [ DW_TAG_array_type ]
 !19 = metadata !{metadata !20}
-!20 = metadata !{i32 720929, i64 0, i64 9}        ; [ DW_TAG_subrange_type ]
+!20 = metadata !{i32 720929, i64 0, i64 9, i64 10}        ; [ DW_TAG_subrange_type ]
 !21 = metadata !{i32 7, i32 5, metadata !22, null}
 !22 = metadata !{i32 720907, metadata !5, i32 6, i32 1, metadata !6, i32 0} ; [ DW_TAG_lexical_block ]
 !23 = metadata !{i32 9, i32 5, metadata !22, null}
diff --git a/test/JitListener/test-inline.ll b/test/JitListener/test-inline.ll
index 5a4bf1f374..6da3a038b0 100644
--- a/test/JitListener/test-inline.ll
+++ b/test/JitListener/test-inline.ll
@@ -154,7 +154,7 @@ declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32,
 !24 = metadata !{i32 720909, metadata !20, metadata !"c2", metadata !6, i32 24, i64 16, i64 8, i64 8, i32 0, metadata !25} ; [ DW_TAG_member ]
 !25 = metadata !{i32 720897, null, metadata !"", null, i32 0, i64 16, i64 8, i32 0, i32 0, metadata !23, metadata !26, i32 0, i32 0} ; [ DW_TAG_array_type ]
 !26 = metadata !{metadata !27}
-!27 = metadata !{i32 720929, i64 0, i64 1}        ; [ DW_TAG_subrange_type ]
+!27 = metadata !{i32 720929, i64 0, i64 1, i64 2}        ; [ DW_TAG_subrange_type ]
 !28 = metadata !{i32 720942, i32 0, metadata !20, metadata !"char_struct", metadata !"char_struct", metadata !"", metadata !6, i32 22, metadata !29, i1 false, i1 false, i32 0, i32 0, null, i32 320, i1 false, null, null, i32 0, metadata !10} ; [ DW_TAG_subprogram ]
 !29 = metadata !{i32 720917, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !30, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
 !30 = metadata !{null, metadata !31}
diff --git a/test/JitListener/test-parameters.ll b/test/JitListener/test-parameters.ll
index b90a3ea356..a53c0809e1 100644
--- a/test/JitListener/test-parameters.ll
+++ b/test/JitListener/test-parameters.ll
@@ -144,7 +144,7 @@ declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32,
 !24 = metadata !{i32 720909, metadata !20, metadata !"c2", metadata !6, i32 24, i64 16, i64 8, i64 8, i32 0, metadata !25} ; [ DW_TAG_member ]
 !25 = metadata !{i32 720897, null, metadata !"", null, i32 0, i64 16, i64 8, i32 0, i32 0, metadata !23, metadata !26, i32 0, i32 0} ; [ DW_TAG_array_type ]
 !26 = metadata !{metadata !27}
-!27 = metadata !{i32 720929, i64 0, i64 1}        ; [ DW_TAG_subrange_type ]
+!27 = metadata !{i32 720929, i64 0, i64 1, i64 2}        ; [ DW_TAG_subrange_type ]
 !28 = metadata !{i32 720942, i32 0, metadata !20, metadata !"char_struct", metadata !"char_struct", metadata !"", metadata !6, i32 22, metadata !29, i1 false, i1 false, i32 0, i32 0, null, i32 320, i1 false, null, null, i32 0, metadata !10} ; [ DW_TAG_subprogram ]
 !29 = metadata !{i32 720917, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !30, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
 !30 = metadata !{null, metadata !31}