[codeview] Emit retained types

Differential Revision: http://reviews.llvm.org/D21630

llvm-svn: 273579

1 files changed, 96 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/COFF/retained-types.ll b/llvm/test/DebugInfo/COFF/retained-types.ll
new file mode 100644
index 00000000000..1839d00a76d
--- /dev/null
+++ b/llvm/test/DebugInfo/COFF/retained-types.ll
@@ -0,0 +1,96 @@
+; RUN: llc < %s -filetype=obj | llvm-readobj - -codeview | FileCheck %s
+
+; This test checks that types which are used in expressions, but for which
+; there are no variables, known as retained types, get emitted.
+
+; C++ source to regenerate:
+; $ cat /tmp/a.cc
+; struct S { int x; };
+; int f(void *p) {
+;   return static_cast<S*>(p)->x;
+; }
+; $ clang /tmp/a.cc -S -emit-llvm -g -gcodeview -target x86_64-windows-msvc -o t.ll
+
+; CHECK:       Struct (0x{{[0-9a-f]+}}) {
+; CHEC-NEXT:     TypeLeafKind: LF_STRUCTURE (0x1505)
+; CHEC-NEXT:     MemberCount: 0
+; CHEC-NEXT:     Properties [ (0x280)
+; CHEC-NEXT:       ForwardReference (0x80)
+; CHEC-NEXT:       HasUniqueName (0x200)
+; CHEC-NEXT:     ]
+; CHEC-NEXT:     FieldList: 0x0
+; CHEC-NEXT:     DerivedFrom: 0x0
+; CHEC-NEXT:     VShape: 0x0
+; CHEC-NEXT:     SizeOf: 0
+; CHEC-NEXT:     Name: S
+; CHEC-NEXT:     LinkageName: .?AUS@@
+; CHEC-NEXT:   }
+
+; CHECK:        Struct (0x{{[0-9a-f]+}}) {
+; CHECK-NEXT:     TypeLeafKind: LF_STRUCTURE (0x1505)
+; CHECK-NEXT:     MemberCount: 1
+; CHECK-NEXT:     Properties [ (0x200)
+; CHECK-NEXT:       HasUniqueName (0x200)
+; CHECK-NEXT:     ]
+; CHECK-NEXT:     FieldList: <field list> (0x{{[0-9a-f]+}})
+; CHECK-NEXT:     DerivedFrom: 0x0
+; CHECK-NEXT:     VShape: 0x0
+; CHECK-NEXT:     SizeOf: 4
+; CHECK-NEXT:     Name: S
+; CHECK-NEXT:     LinkageName: .?AUS@@
+; CHECK-NEXT:   }
+
+; ModuleID = '/tmp/a.cc'
+source_filename = "/tmp/a.cc"
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64--windows-msvc18.0.0"
+
+%struct.S = type { i32 }
+
+; Function Attrs: nounwind uwtable
+define i32 @"\01?f@@YAHPEAX@Z"(i8* %p) #0 !dbg !13 {
+entry:
+  %p.addr = alloca i8*, align 8
+  store i8* %p, i8** %p.addr, align 8
+  call void @llvm.dbg.declare(metadata i8** %p.addr, metadata !17, metadata !18), !dbg !19
+  %0 = load i8*, i8** %p.addr, align 8, !dbg !20
+  %1 = bitcast i8* %0 to %struct.S*, !dbg !21
+  %x = getelementptr inbounds %struct.S, %struct.S* %1, i32 0, i32 0, !dbg !22
+  %2 = load i32, i32* %x, align 4, !dbg !22
+  ret i32 %2, !dbg !23
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!9, !10, !11}
+!llvm.ident = !{!12}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 273441) (llvm/trunk 273449)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
+!1 = !DIFile(filename: "/tmp/a.cc", directory: "/usr/local/google/work/llvm/build.release")
+!2 = !{}
+!3 = !{!4}
+!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64, align: 64)
+!5 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !1, line: 1, size: 32, align: 32, elements: !6, identifier: ".?AUS@@")
+!6 = !{!7}
+!7 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !5, file: !1, line: 1, baseType: !8, size: 32, align: 32)
+!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!9 = !{i32 2, !"CodeView", i32 1}
+!10 = !{i32 2, !"Debug Info Version", i32 3}
+!11 = !{i32 1, !"PIC Level", i32 2}
+!12 = !{!"clang version 3.9.0 (trunk 273441) (llvm/trunk 273449)"}
+!13 = distinct !DISubprogram(name: "f", linkageName: "\01?f@@YAHPEAX@Z", scope: !1, file: !1, line: 2, type: !14, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
+!14 = !DISubroutineType(types: !15)
+!15 = !{!8, !16}
+!16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64, align: 64)
+!17 = !DILocalVariable(name: "p", arg: 1, scope: !13, file: !1, line: 2, type: !16)
+!18 = !DIExpression()
+!19 = !DILocation(line: 2, column: 13, scope: !13)
+!20 = !DILocation(line: 3, column: 26, scope: !13)
+!21 = !DILocation(line: 3, column: 10, scope: !13)
+!22 = !DILocation(line: 3, column: 30, scope: !13)
+!23 = !DILocation(line: 3, column: 3, scope: !13)