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, 0 insertions, 391 deletions

diff --git a/llvm/test/DebugInfo/incorrect-variable-debugloc.ll b/llvm/test/DebugInfo/incorrect-variable-debugloc.ll
deleted file mode 100644
index b5787923d1c..00000000000
--- a/llvm/test/DebugInfo/incorrect-variable-debugloc.ll
+++ /dev/null
@@ -1,391 +0,0 @@
-; REQUIRES: object-emission
-
-; RUN: %llc_dwarf -O2 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
-
-; This is a test case that's as reduced as I can get it, though I haven't fully
-; understood the mechanisms by which this bug occurs, so perhaps there's further
-; simplification to be had (it's certainly a bit non-obvious what's going on). I
-; hesitate to hand-craft or otherwise simplify the IR compared to what Clang
-; generates as this is a particular tickling of optimizations and debug location
-; propagation I want a realistic example of.
-
-; Generated with clang-tot -cc1 -g -O2 -w -std=c++11  -fsanitize=address,use-after-return -fcxx-exceptions -fexceptions -x c++ incorrect-variable-debug-loc.cpp -emit-llvm
-
-; struct A {
-;   int m_fn1();
-; };
-;
-; struct B {
-;   void __attribute__((always_inline)) m_fn2() { i = 0; }
-;   int i;
-; };
-;
-; struct C {
-;   void m_fn3();
-;   int j;
-;   B b;
-; };
-;
-; int fn1() {
-;   C A;
-;   A.b.m_fn2();
-;   A.m_fn3();
-; }
-; void C::m_fn3() {
-;   A().m_fn1();
-;   b.m_fn2();
-; }
-
-; CHECK: DW_TAG_structure_type
-; CHECK-NEXT: DW_AT_name {{.*}} "C"
-; CHECK: [[M_FN3_DECL:.*]]:  DW_TAG_subprogram
-; CHECK-NOT: {{DW_TAG|NULL}}
-; CHECK: DW_AT_name {{.*}} "m_fn3"
-
-; CHECK: DW_AT_specification {{.*}} {[[M_FN3_DECL]]}
-; CHECK-NOT: DW_TAG
-; CHECK:   DW_TAG_formal_parameter
-; CHECK-NOT: DW_TAG
-; CHECK:     DW_AT_name {{.*}} "this"
-
-%struct.C = type { i32, %struct.B }
-%struct.B = type { i32 }
-%struct.A = type { i8 }
-
-@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
-@__asan_option_detect_stack_use_after_return = external global i32
-@__asan_gen_ = private unnamed_addr constant [11 x i8] c"1 32 8 1 A\00", align 1
-@__asan_gen_1 = private unnamed_addr constant [13 x i8] c"1 32 1 3 tmp\00", align 1
-
-; Function Attrs: noreturn sanitize_address
-define i32 @_Z3fn1v() #0 {
-entry:
-  %MyAlloca = alloca [64 x i8], align 32, !dbg !39
-  %0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !39
-  %1 = load i32, i32* @__asan_option_detect_stack_use_after_return, !dbg !39
-  %2 = icmp ne i32 %1, 0, !dbg !39
-  br i1 %2, label %3, label %5
-
-; <label>:3                                       ; preds = %entry
-  %4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !39
-  br label %5
-
-; <label>:5                                       ; preds = %entry, %3
-  %6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !39
-  %7 = add i64 %6, 32, !dbg !39
-  %8 = inttoptr i64 %7 to %struct.C*, !dbg !39
-  %9 = inttoptr i64 %6 to i64*, !dbg !39
-  store i64 1102416563, i64* %9, !dbg !39
-  %10 = add i64 %6, 8, !dbg !39
-  %11 = inttoptr i64 %10 to i64*, !dbg !39
-  store i64 ptrtoint ([11 x i8]* @__asan_gen_ to i64), i64* %11, !dbg !39
-  %12 = add i64 %6, 16, !dbg !39
-  %13 = inttoptr i64 %12 to i64*, !dbg !39
-  store i64 ptrtoint (i32 ()* @_Z3fn1v to i64), i64* %13, !dbg !39
-  %14 = lshr i64 %6, 3, !dbg !39
-  %15 = add i64 %14, 2147450880, !dbg !39
-  %16 = add i64 %15, 0, !dbg !39
-  %17 = inttoptr i64 %16 to i64*, !dbg !39
-  store i64 -868083117767659023, i64* %17, !dbg !39
-  %i.i = getelementptr inbounds %struct.C, %struct.C* %8, i64 0, i32 1, i32 0, !dbg !39
-  %18 = ptrtoint i32* %i.i to i64, !dbg !39
-  %19 = lshr i64 %18, 3, !dbg !39
-  %20 = add i64 %19, 2147450880, !dbg !39
-  %21 = inttoptr i64 %20 to i8*, !dbg !39
-  %22 = load i8, i8* %21, !dbg !39
-  %23 = icmp ne i8 %22, 0, !dbg !39
-  br i1 %23, label %24, label %30, !dbg !39
-
-; <label>:24                                      ; preds = %5
-  %25 = and i64 %18, 7, !dbg !39
-  %26 = add i64 %25, 3, !dbg !39
-  %27 = trunc i64 %26 to i8, !dbg !39
-  %28 = icmp sge i8 %27, %22, !dbg !39
-  br i1 %28, label %29, label %30
-
-; <label>:29                                      ; preds = %24
-  call void @__asan_report_store4(i64 %18), !dbg !39
-  call void asm sideeffect "", ""()
-  unreachable
-
-; <label>:30                                      ; preds = %24, %5
-  store i32 0, i32* %i.i, align 4, !dbg !39, !tbaa !41
-  tail call void @llvm.dbg.value(metadata %struct.C* %8, i64 0, metadata !27, metadata !DIExpression()), !dbg !46
-  call void @_ZN1C5m_fn3Ev(%struct.C* %8), !dbg !47
-  unreachable, !dbg !47
-}
-
-; Function Attrs: sanitize_address
-define void @_ZN1C5m_fn3Ev(%struct.C* nocapture %this) #1 align 2 {
-entry:
-  %MyAlloca = alloca [64 x i8], align 32, !dbg !48
-  %0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !48
-  %1 = load i32, i32* @__asan_option_detect_stack_use_after_return, !dbg !48
-  %2 = icmp ne i32 %1, 0, !dbg !48
-  br i1 %2, label %3, label %5
-
-; <label>:3                                       ; preds = %entry
-  %4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !48
-  br label %5
-
-; <label>:5                                       ; preds = %entry, %3
-  %6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !48
-  %7 = add i64 %6, 32, !dbg !48
-  %8 = inttoptr i64 %7 to %struct.A*, !dbg !48
-  %9 = inttoptr i64 %6 to i64*, !dbg !48
-  store i64 1102416563, i64* %9, !dbg !48
-  %10 = add i64 %6, 8, !dbg !48
-  %11 = inttoptr i64 %10 to i64*, !dbg !48
-  store i64 ptrtoint ([13 x i8]* @__asan_gen_1 to i64), i64* %11, !dbg !48
-  %12 = add i64 %6, 16, !dbg !48
-  %13 = inttoptr i64 %12 to i64*, !dbg !48
-  store i64 ptrtoint (void (%struct.C*)* @_ZN1C5m_fn3Ev to i64), i64* %13, !dbg !48
-  %14 = lshr i64 %6, 3, !dbg !48
-  %15 = add i64 %14, 2147450880, !dbg !48
-  %16 = add i64 %15, 0, !dbg !48
-  %17 = inttoptr i64 %16 to i64*, !dbg !48
-  store i64 -868083113472691727, i64* %17, !dbg !48
-  tail call void @llvm.dbg.value(metadata %struct.C* %this, i64 0, metadata !30, metadata !DIExpression()), !dbg !48
-  %call = call i32 @_ZN1A5m_fn1Ev(%struct.A* %8), !dbg !49
-  %i.i = getelementptr inbounds %struct.C, %struct.C* %this, i64 0, i32 1, i32 0, !dbg !50
-  %18 = ptrtoint i32* %i.i to i64, !dbg !50
-  %19 = lshr i64 %18, 3, !dbg !50
-  %20 = add i64 %19, 2147450880, !dbg !50
-  %21 = inttoptr i64 %20 to i8*, !dbg !50
-  %22 = load i8, i8* %21, !dbg !50
-  %23 = icmp ne i8 %22, 0, !dbg !50
-  br i1 %23, label %24, label %30, !dbg !50
-
-; <label>:24                                      ; preds = %5
-  %25 = and i64 %18, 7, !dbg !50
-  %26 = add i64 %25, 3, !dbg !50
-  %27 = trunc i64 %26 to i8, !dbg !50
-  %28 = icmp sge i8 %27, %22, !dbg !50
-  br i1 %28, label %29, label %30
-
-; <label>:29                                      ; preds = %24
-  call void @__asan_report_store4(i64 %18), !dbg !50
-  call void asm sideeffect "", ""()
-  unreachable
-
-; <label>:30                                      ; preds = %24, %5
-  store i32 0, i32* %i.i, align 4, !dbg !50, !tbaa !41
-  store i64 1172321806, i64* %9, !dbg !52
-  %31 = icmp ne i64 %6, %0, !dbg !52
-  br i1 %31, label %32, label %39, !dbg !52
-
-; <label>:32                                      ; preds = %30
-  %33 = add i64 %15, 0, !dbg !52
-  %34 = inttoptr i64 %33 to i64*, !dbg !52
-  store i64 -723401728380766731, i64* %34, !dbg !52
-  %35 = add i64 %6, 56, !dbg !52
-  %36 = inttoptr i64 %35 to i64*, !dbg !52
-  %37 = load i64, i64* %36, !dbg !52
-  %38 = inttoptr i64 %37 to i8*, !dbg !52
-  store i8 0, i8* %38, !dbg !52
-  br label %42, !dbg !52
-
-; <label>:39                                      ; preds = %30
-  %40 = add i64 %15, 0, !dbg !52
-  %41 = inttoptr i64 %40 to i64*, !dbg !52
-  store i64 0, i64* %41, !dbg !52
-  br label %42, !dbg !52
-
-; <label>:42                                      ; preds = %39, %32
-  ret void, !dbg !52
-}
-
-declare i32 @_ZN1A5m_fn1Ev(%struct.A*) #2
-
-; Function Attrs: nounwind readnone
-declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3
-
-define internal void @asan.module_ctor() {
-  tail call void @__asan_init_v3()
-  ret void
-}
-
-declare void @__asan_init_v3()
-
-declare void @__asan_report_load1(i64)
-
-declare void @__asan_load1(i64)
-
-declare void @__asan_report_load2(i64)
-
-declare void @__asan_load2(i64)
-
-declare void @__asan_report_load4(i64)
-
-declare void @__asan_load4(i64)
-
-declare void @__asan_report_load8(i64)
-
-declare void @__asan_load8(i64)
-
-declare void @__asan_report_load16(i64)
-
-declare void @__asan_load16(i64)
-
-declare void @__asan_report_store1(i64)
-
-declare void @__asan_store1(i64)
-
-declare void @__asan_report_store2(i64)
-
-declare void @__asan_store2(i64)
-
-declare void @__asan_report_store4(i64)
-
-declare void @__asan_store4(i64)
-
-declare void @__asan_report_store8(i64)
-
-declare void @__asan_store8(i64)
-
-declare void @__asan_report_store16(i64)
-
-declare void @__asan_store16(i64)
-
-declare void @__asan_report_load_n(i64, i64)
-
-declare void @__asan_report_store_n(i64, i64)
-
-declare void @__asan_loadN(i64, i64)
-
-declare void @__asan_storeN(i64, i64)
-
-declare i8* @__asan_memmove(i8*, i8*, i64)
-
-declare i8* @__asan_memcpy(i8*, i8*, i64)
-
-declare i8* @__asan_memset(i8*, i32, i64)
-
-declare void @__asan_handle_no_return()
-
-declare void @__sanitizer_cov()
-
-declare void @__sanitizer_ptr_cmp(i64, i64)
-
-declare void @__sanitizer_ptr_sub(i64, i64)
-
-declare i64 @__asan_stack_malloc_0(i64, i64)
-
-declare void @__asan_stack_free_0(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_1(i64, i64)
-
-declare void @__asan_stack_free_1(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_2(i64, i64)
-
-declare void @__asan_stack_free_2(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_3(i64, i64)
-
-declare void @__asan_stack_free_3(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_4(i64, i64)
-
-declare void @__asan_stack_free_4(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_5(i64, i64)
-
-declare void @__asan_stack_free_5(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_6(i64, i64)
-
-declare void @__asan_stack_free_6(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_7(i64, i64)
-
-declare void @__asan_stack_free_7(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_8(i64, i64)
-
-declare void @__asan_stack_free_8(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_9(i64, i64)
-
-declare void @__asan_stack_free_9(i64, i64, i64)
-
-declare i64 @__asan_stack_malloc_10(i64, i64)
-
-declare void @__asan_stack_free_10(i64, i64, i64)
-
-declare void @__asan_poison_stack_memory(i64, i64)
-
-declare void @__asan_unpoison_stack_memory(i64, i64)
-
-declare void @__asan_before_dynamic_init(i64)
-
-declare void @__asan_after_dynamic_init()
-
-declare void @__asan_register_globals(i64, i64)
-
-declare void @__asan_unregister_globals(i64, i64)
-
-declare void @__sanitizer_cov_module_init(i64)
-
-attributes #0 = { noreturn sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #1 = { sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
-attributes #3 = { nounwind readnone }
-
-!llvm.dbg.cu = !{!0}
-!llvm.module.flags = !{!36, !37}
-!llvm.ident = !{!38}
-
-!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !21, globals: !2, imports: !2)
-!1 = !DIFile(filename: "<stdin>", directory: "/tmp/dbginfo")
-!2 = !{}
-!3 = !{!4, !14}
-!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "C", line: 10, size: 64, align: 32, file: !5, elements: !6, identifier: "_ZTS1C")
-!5 = !DIFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo")
-!6 = !{!7, !9, !10}
-!7 = !DIDerivedType(tag: DW_TAG_member, name: "j", line: 12, size: 32, align: 32, file: !5, scope: !"_ZTS1C", baseType: !8)
-!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
-!9 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 13, size: 32, align: 32, offset: 32, file: !5, scope: !"_ZTS1C", baseType: !"_ZTS1B")
-!10 = !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 11, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 11, file: !5, scope: !"_ZTS1C", type: !11)
-!11 = !DISubroutineType(types: !12)
-!12 = !{null, !13}
-!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !"_ZTS1C")
-!14 = !DICompositeType(tag: DW_TAG_structure_type, name: "B", line: 5, size: 32, align: 32, file: !5, elements: !15, identifier: "_ZTS1B")
-!15 = !{!16, !17}
-!16 = !DIDerivedType(tag: DW_TAG_member, name: "i", line: 7, size: 32, align: 32, file: !5, scope: !"_ZTS1B", baseType: !8)
-!17 = !DISubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 6, file: !5, scope: !"_ZTS1B", type: !18)
-!18 = !DISubroutineType(types: !19)
-!19 = !{null, !20}
-!20 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !"_ZTS1B")
-!21 = !{!22, !28, !32}
-!22 = distinct !DISubprogram(name: "fn1", linkageName: "_Z3fn1v", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 16, file: !5, scope: !23, type: !24, function: i32 ()* @_Z3fn1v, variables: !26)
-!23 = !DIFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo")
-!24 = !DISubroutineType(types: !25)
-!25 = !{!8}
-!26 = !{!27}
-!27 = !DILocalVariable(name: "A", line: 17, scope: !22, file: !23, type: !"_ZTS1C")
-!28 = distinct !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 21, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 21, file: !5, scope: !"_ZTS1C", type: !11, function: void (%struct.C*)* @_ZN1C5m_fn3Ev, declaration: !10, variables: !29)
-!29 = !{!30}
-!30 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !28, type: !31)
-!31 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !"_ZTS1C")
-!32 = distinct !DISubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 6, file: !5, scope: !"_ZTS1B", type: !18, declaration: !17, variables: !33)
-!33 = !{!34}
-!34 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !32, type: !35)
-!35 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !"_ZTS1B")
-!36 = !{i32 2, !"Dwarf Version", i32 4}
-!37 = !{i32 2, !"Debug Info Version", i32 3}
-!38 = !{!"clang version 3.5.0 "}
-!39 = !DILocation(line: 6, scope: !32, inlinedAt: !40)
-!40 = !DILocation(line: 18, scope: !22)
-!41 = !{!42, !43, i64 0}
-!42 = !{!"_ZTS1B", !43, i64 0}
-!43 = !{!"int", !44, i64 0}
-!44 = !{!"omnipotent char", !45, i64 0}
-!45 = !{!"Simple C/C++ TBAA"}
-!46 = !DILocation(line: 17, scope: !22)
-!47 = !DILocation(line: 19, scope: !22)
-!48 = !DILocation(line: 0, scope: !28)
-!49 = !DILocation(line: 22, scope: !28)
-!50 = !DILocation(line: 6, scope: !32, inlinedAt: !51)
-!51 = !DILocation(line: 23, scope: !28)
-!52 = !DILocation(line: 24, scope: !28)