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, 80 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Generic/enum.ll b/llvm/test/DebugInfo/Generic/enum.ll
new file mode 100644
index 00000000000..8d91c4e3943
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/enum.ll
@@ -0,0 +1,80 @@
+; REQUIRES: object-emission
+
+; RUN: %llc_dwarf -O0 -filetype=obj < %s > %t
+; RUN: llvm-dwarfdump %t | FileCheck %s
+
+; IR generated from the following code compiled with clang -g:
+; enum e1 { I, J = 0xffffffffU, K = 0xf000000000000000ULL } a;
+; enum e2 { X };
+; void func() {
+;   int b = X;
+; }
+
+; These values were previously being truncated to -1 and 0 respectively.
+
+; CHECK: debug_info contents
+; CHECK: DW_TAG_enumeration_type
+; CHECK-NEXT: DW_AT_name{{.*}} = "e1"
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_enumerator
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_enumerator
+; CHECK-NEXT: DW_AT_name{{.*}} = "J"
+; CHECK-NEXT: DW_AT_const_value [DW_FORM_sdata]     (4294967295)
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_enumerator
+; CHECK-NEXT: DW_AT_name{{.*}} = "K"
+; CHECK-NEXT: DW_AT_const_value [DW_FORM_sdata]     (-1152921504606846976)
+
+; Check that we retain enums that aren't referenced by any variables, etc
+; CHECK: DW_TAG_enumeration_type
+; CHECK-NEXT: DW_AT_name{{.*}} = "e2"
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_enumerator
+; CHECK-NEXT: DW_AT_name{{.*}} = "X"
+
+@a = global i64 0, align 8
+
+; Function Attrs: nounwind uwtable
+define void @_Z4funcv() #0 {
+entry:
+  %b = alloca i32, align 4
+  call void @llvm.dbg.declare(metadata i32* %b, metadata !20, metadata !DIExpression()), !dbg !22
+  store i32 0, i32* %b, align 4, !dbg !22
+  ret void, !dbg !23
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind 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" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!19, !24}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !11, subprograms: !12, globals: !17, imports: !11)
+!1 = !DIFile(filename: "enum.cpp", directory: "/tmp")
+!2 = !{!3, !8}
+!3 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "e1", line: 1, size: 64, align: 64, file: !1, elements: !4)
+!4 = !{!5, !6, !7}
+!5 = !DIEnumerator(name: "I", value: 0) ; [ DW_TAG_enumerator ] [I :: 0]
+!6 = !DIEnumerator(name: "J", value: 4294967295) ; [ DW_TAG_enumerator ] [J :: 4294967295]
+!7 = !DIEnumerator(name: "K", value: -1152921504606846976) ; [ DW_TAG_enumerator ] [K :: 17293822569102704640]
+!8 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "e2", line: 2, size: 32, align: 32, file: !1, elements: !9)
+!9 = !{!10}
+!10 = !DIEnumerator(name: "X", value: 0) ; [ DW_TAG_enumerator ] [X :: 0]
+!11 = !{}
+!12 = !{!13}
+!13 = distinct !DISubprogram(name: "func", linkageName: "_Z4funcv", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !14, type: !15, function: void ()* @_Z4funcv, variables: !11)
+!14 = !DIFile(filename: "enum.cpp", directory: "/tmp")
+!15 = !DISubroutineType(types: !16)
+!16 = !{null}
+!17 = !{!18}
+!18 = !DIGlobalVariable(name: "a", line: 1, isLocal: false, isDefinition: true, scope: null, file: !14, type: !3, variable: i64* @a)
+!19 = !{i32 2, !"Dwarf Version", i32 3}
+!20 = !DILocalVariable(name: "b", line: 4, scope: !13, file: !14, type: !21)
+!21 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!22 = !DILocation(line: 4, scope: !13)
+!23 = !DILocation(line: 5, scope: !13)
+!24 = !{i32 1, !"Debug Info Version", i32 3}