Make the default triple optional by allowing an empty string

When building LLVM as a (potentially dynamic) library that can be linked against
by multiple compilers, the default triple is not really meaningful.
We allow to explicitely set it to an empty string when configuring LLVM.
In this case, said "target independent" tests in the test suite that are using
the default triple are disabled by matching the newly available feature
"default_triple".

Reviewers: probinson, echristo
Differential Revision: http://reviews.llvm.org/D12660

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 247775

1 files changed, 101 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Generic/varargs.ll b/llvm/test/DebugInfo/Generic/varargs.ll
new file mode 100644
index 00000000000..1b5a921ad53
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/varargs.ll
@@ -0,0 +1,101 @@
+; RUN: %llc_dwarf -O0 -filetype=obj -o %t.o %s
+; RUN: llvm-dwarfdump -debug-dump=info %t.o | FileCheck %s
+; REQUIRES: object-emission
+;
+; Test debug info for variadic function arguments.
+; Created from tools/clang/tests/CodeGenCXX/debug-info-varargs.cpp
+;
+; The ... parameter of variadic should be emitted as
+; DW_TAG_unspecified_parameters.
+;
+; Normal variadic function.
+; void b(int c, ...);
+;
+; CHECK: DW_TAG_subprogram
+; CHECK-NOT: DW_TAG
+; CHECK: DW_AT_name {{.*}} "a"
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_unspecified_parameters
+;
+; CHECK: DW_TAG_subprogram
+; CHECK-NOT: DW_TAG
+; CHECK: DW_AT_name {{.*}} "b"
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_variable
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_variable
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_unspecified_parameters
+;
+; Variadic C++ member function.
+; struct A { void a(int c, ...); }
+;
+; Variadic function pointer.
+; void (*fptr)(int, ...);
+;
+; CHECK: DW_TAG_subroutine_type
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NOT: DW_TAG
+; CHECK: DW_TAG_unspecified_parameters
+;
+; ModuleID = 'llvm/tools/clang/test/CodeGenCXX/debug-info-varargs.cpp'
+
+%struct.A = type { i8 }
+
+; Function Attrs: nounwind ssp uwtable
+define void @_Z1biz(i32 %c, ...) #0 {
+  %1 = alloca i32, align 4
+  %a = alloca %struct.A, align 1
+  %fptr = alloca void (i32, ...)*, align 8
+  store i32 %c, i32* %1, align 4
+  call void @llvm.dbg.declare(metadata i32* %1, metadata !21, metadata !DIExpression()), !dbg !22
+  call void @llvm.dbg.declare(metadata %struct.A* %a, metadata !23, metadata !DIExpression()), !dbg !24
+  call void @llvm.dbg.declare(metadata void (i32, ...)** %fptr, metadata !25, metadata !DIExpression()), !dbg !27
+  store void (i32, ...)* @_Z1biz, void (i32, ...)** %fptr, align 8, !dbg !27
+  ret void, !dbg !28
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind ssp uwtable }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!18, !19}
+!llvm.ident = !{!20}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !3, subprograms: !13, globals: !2, imports: !2)
+!1 = !DIFile(filename: "llvm/tools/clang/test/CodeGenCXX/debug-info-varargs.cpp", directory: "radar/13690847")
+!2 = !{}
+!3 = !{!4}
+!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", line: 3, size: 8, align: 8, file: !1, elements: !5, identifier: "_ZTS1A")
+!5 = !{!6}
+!6 = !DISubprogram(name: "a", linkageName: "_ZN1A1aEiz", line: 6, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 6, file: !1, scope: !"_ZTS1A", type: !7)
+!7 = !DISubroutineType(types: !8)
+!8 = !{null, !9, !10, null}
+!9 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !"_ZTS1A")
+!10 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!13 = !{!14}
+!14 = distinct !DISubprogram(name: "b", linkageName: "_Z1biz", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 13, file: !1, scope: !15, type: !16, function: void (i32, ...)* @_Z1biz, variables: !2)
+!15 = !DIFile(filename: "llvm/tools/clang/test/CodeGenCXX/debug-info-varargs.cpp", directory: "radar/13690847")
+!16 = !DISubroutineType(types: !17)
+!17 = !{null, !10, null}
+!18 = !{i32 2, !"Dwarf Version", i32 2}
+!19 = !{i32 1, !"Debug Info Version", i32 3}
+!20 = !{!"clang version 3.5 "}
+!21 = !DILocalVariable(name: "c", line: 13, arg: 1, scope: !14, file: !15, type: !10)
+!22 = !DILocation(line: 13, scope: !14)
+!23 = !DILocalVariable(name: "a", line: 16, scope: !14, file: !15, type: !4)
+!24 = !DILocation(line: 16, scope: !14)
+!25 = !DILocalVariable(name: "fptr", line: 18, scope: !14, file: !15, type: !26)
+!26 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !16)
+!27 = !DILocation(line: 18, scope: !14)
+!28 = !DILocation(line: 22, scope: !14)