Debug Info: In DIBuilder, the derived-from field of a DW_TAG_pointer_type

is updated to use DITypeRef.

Move isUnsignedDIType and getOriginalTypeSize from DebugInfo.h to be static
helper functions in DwarfCompileUnit. We already have a static helper function
"isTypeSigned" in DwarfCompileUnit, and a pointer to DwarfDebug is added to
resolve the derived-from field. All three functions need to go across link
for derived-from fields, so we need to get hold of a type identifier map.

A pointer to DwarfDebug is also added to DbgVariable in order to resolve the
derived-from field.

Debug info verifier is updated to check a derived-from field is a TypeRef.
Verifier will not go across link for derived-from fields, in debug info finder,
we go across the link to add derived-from fields to types.

Function getDICompositeType is only used by dragonegg and since dragonegg does
not generate identifier for types, we use an empty map to resolve the
derived-from field.

When printing a derived-from field, we use DITypeRef::getName to either return
the type identifier or getName of the DIType.

A paired commit at clang is required due to changes to DIBuilder.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192018 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 153 insertions, 0 deletions

diff --git a/test/Linker/Inputs/type-unique-simple2-a.ll b/test/Linker/Inputs/type-unique-simple2-a.ll
new file mode 100644
index 0000000000..20cfd54505
--- /dev/null
+++ b/test/Linker/Inputs/type-unique-simple2-a.ll
@@ -0,0 +1,83 @@
+; CHECK: 0x[[INT:.*]]: DW_TAG_base_type
+; CHECK-NEXT: DW_AT_name {{.*}} = "int"
+; CHECK-NOT: DW_TAG_base_type
+; CHECK: 0x[[BASE:.*]]: DW_TAG_structure_type
+; CHECK-NEXT: DW_AT_name {{.*}} = "Base"
+; CHECK-NOT: DW_TAG_structure_type
+; CHECK: DW_TAG_formal_parameter
+; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[INT]])
+; CHECK: DW_TAG_variable
+; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[BASE]])
+
+; LINK: DW_TAG_structure_type
+; LINK-NOT: DW_TAG_structure_type
+
+; Content of header files:
+; struct Base {
+;   int a;
+;   Base *b;
+; };
+; Content of foo.cpp:
+; 
+; #include "a.hpp"
+; void f(int a) {
+;   Base t;
+; }
+; Content of bar.cpp:
+; 
+; #include "a.hpp"
+; void f(int);
+; void g(int a) {
+;   Base t;
+; }
+; int main() {
+;   f(0);
+;   g(1);
+;   return 0;
+; }
+; ModuleID = 'foo.cpp'
+
+%struct.Base = type { i32, %struct.Base* }
+
+; Function Attrs: nounwind ssp uwtable
+define void @_Z1fi(i32 %a) #0 {
+entry:
+  %a.addr = alloca i32, align 4
+  %t = alloca %struct.Base, align 8
+  store i32 %a, i32* %a.addr, align 4
+  call void @llvm.dbg.declare(metadata !{i32* %a.addr}, metadata !17), !dbg !18
+  call void @llvm.dbg.declare(metadata !{%struct.Base* %t}, metadata !19), !dbg !20
+  ret void, !dbg !21
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata) #1
+
+attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!16}
+
+!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 (http://llvm.org/git/clang.git 8a3f9e46cb988d2c664395b21910091e3730ae82) (http://llvm.org/git/llvm.git 4699e9549358bc77824a59114548eecc3f7c523c)", i1 false, metadata !"", i32 0, metadata !2, metadata !3, metadata !11, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [foo.cpp] [DW_LANG_C_plus_plus]
+!1 = metadata !{metadata !"foo.cpp", metadata !"."}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786451, metadata !5, null, metadata !"Base", i32 1, i64 128, i64 64, i32 0, i32 0, null, metadata !6, i32 0, null, null, metadata !"_ZTS4Base"} ; [ DW_TAG_structure_type ] [Base] [line 1, size 128, align 64, offset 0] [def] [from ]
+!5 = metadata !{metadata !"./a.hpp", metadata !"."}
+!6 = metadata !{metadata !7, metadata !9}
+!7 = metadata !{i32 786445, metadata !5, metadata !"_ZTS4Base", metadata !"a", i32 2, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int]
+!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 786445, metadata !5, metadata !"_ZTS4Base", metadata !"b", i32 3, i64 64, i64 64, i64 64, i32 0, metadata !10} ; [ DW_TAG_member ] [b] [line 3, size 64, align 64, offset 64] [from ]
+!10 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !"_ZTS4Base"}
+!11 = metadata !{metadata !12}
+!12 = metadata !{i32 786478, metadata !1, metadata !13, metadata !"f", metadata !"f", metadata !"_Z1fi", i32 3, metadata !14, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i32)* @_Z1fi, null, null, metadata !2, i32 3} ; [ DW_TAG_subprogram ] [line 3] [def] [f]
+!13 = metadata !{i32 786473, metadata !1}         ; [ DW_TAG_file_type ] [foo.cpp]
+!14 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !15, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!15 = metadata !{null, metadata !8}
+!16 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
+!17 = metadata !{i32 786689, metadata !12, metadata !"a", metadata !13, i32 16777219, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [a] [line 3]
+!18 = metadata !{i32 3, i32 0, metadata !12, null}
+!19 = metadata !{i32 786688, metadata !12, metadata !"t", metadata !13, i32 4, metadata !4, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [t] [line 4]
+!20 = metadata !{i32 4, i32 0, metadata !12, null}
+!21 = metadata !{i32 5, i32 0, metadata !12, null}
diff --git a/test/Linker/Inputs/type-unique-simple2-b.ll b/test/Linker/Inputs/type-unique-simple2-b.ll
new file mode 100644
index 0000000000..898eb3638c
--- /dev/null
+++ b/test/Linker/Inputs/type-unique-simple2-b.ll
@@ -0,0 +1,66 @@
+; ModuleID = 'bar.cpp'
+
+%struct.Base = type { i32, %struct.Base* }
+
+; Function Attrs: nounwind ssp uwtable
+define void @_Z1gi(i32 %a) #0 {
+entry:
+  %a.addr = alloca i32, align 4
+  %t = alloca %struct.Base, align 8
+  store i32 %a, i32* %a.addr, align 4
+  call void @llvm.dbg.declare(metadata !{i32* %a.addr}, metadata !20), !dbg !21
+  call void @llvm.dbg.declare(metadata !{%struct.Base* %t}, metadata !22), !dbg !23
+  ret void, !dbg !24
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata) #1
+
+; Function Attrs: ssp uwtable
+define i32 @main() #2 {
+entry:
+  %retval = alloca i32, align 4
+  store i32 0, i32* %retval
+  call void @_Z1fi(i32 0), !dbg !25
+  call void @_Z1gi(i32 1), !dbg !26
+  ret i32 0, !dbg !27
+}
+
+declare void @_Z1fi(i32) #3
+
+attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone }
+attributes #2 = { ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #3 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!19}
+
+!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 (http://llvm.org/git/clang.git 8a3f9e46cb988d2c664395b21910091e3730ae82) (http://llvm.org/git/llvm.git 4699e9549358bc77824a59114548eecc3f7c523c)", i1 false, metadata !"", i32 0, metadata !2, metadata !3, metadata !11, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [bar.cpp] [DW_LANG_C_plus_plus]
+!1 = metadata !{metadata !"bar.cpp", metadata !"."}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786451, metadata !5, null, metadata !"Base", i32 1, i64 128, i64 64, i32 0, i32 0, null, metadata !6, i32 0, null, null, metadata !"_ZTS4Base"} ; [ DW_TAG_structure_type ] [Base] [line 1, size 128, align 64, offset 0] [def] [from ]
+!5 = metadata !{metadata !"./a.hpp", metadata !"."}
+!6 = metadata !{metadata !7, metadata !9}
+!7 = metadata !{i32 786445, metadata !5, metadata !"_ZTS4Base", metadata !"a", i32 2, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int]
+!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 786445, metadata !5, metadata !"_ZTS4Base", metadata !"b", i32 3, i64 64, i64 64, i64 64, i32 0, metadata !10} ; [ DW_TAG_member ] [b] [line 3, size 64, align 64, offset 64] [from ]
+!10 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !"_ZTS4Base"}
+!11 = metadata !{metadata !12, metadata !16}
+!12 = metadata !{i32 786478, metadata !1, metadata !13, metadata !"g", metadata !"g", metadata !"_Z1gi", i32 4, metadata !14, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i32)* @_Z1gi, null, null, metadata !2, i32 4} ; [ DW_TAG_subprogram ] [line 4] [def] [g]
+!13 = metadata !{i32 786473, metadata !1}         ; [ DW_TAG_file_type ] [bar.cpp]
+!14 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !15, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!15 = metadata !{null, metadata !8}
+!16 = metadata !{i32 786478, metadata !1, metadata !13, metadata !"main", metadata !"main", metadata !"", i32 7, metadata !17, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @main, null, null, metadata !2, i32 7} ; [ DW_TAG_subprogram ] [line 7] [def] [main]
+!17 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !18, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!18 = metadata !{metadata !8}
+!19 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
+!20 = metadata !{i32 786689, metadata !12, metadata !"a", metadata !13, i32 16777220, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [a] [line 4]
+!21 = metadata !{i32 4, i32 0, metadata !12, null}
+!22 = metadata !{i32 786688, metadata !12, metadata !"t", metadata !13, i32 5, metadata !4, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [t] [line 5]
+!23 = metadata !{i32 5, i32 0, metadata !12, null}
+!24 = metadata !{i32 6, i32 0, metadata !12, null}
+!25 = metadata !{i32 8, i32 0, metadata !16, null} ; [ DW_TAG_imported_declaration ]
+!26 = metadata !{i32 9, i32 0, metadata !16, null}
+!27 = metadata !{i32 10, i32 0, metadata !16, null}
diff --git a/test/Linker/type-unique-simple2.ll b/test/Linker/type-unique-simple2.ll
new file mode 100644
index 0000000000..83e4715bf0
--- /dev/null
+++ b/test/Linker/type-unique-simple2.ll
@@ -0,0 +1,4 @@
+; REQUIRES: object-emission
+
+; RUN: llvm-link %S/Inputs/type-unique-simple2-a.ll %S/Inputs/type-unique-simple2-b.ll -S -o %t
+; RUN: cat %t | FileCheck %S/Inputs/type-unique-simple2-a.ll -check-prefix=LINK